551daa285a
Make autothrottle.so understand cisco lcp:interface-config - Yuri Show filter stats in show session - Yuri
4021 lines
101 KiB
C
4021 lines
101 KiB
C
// L2TP Network Server
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// Adrian Kennard 2002
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// Copyright (c) 2003, 2004 Optus Internet Engineering
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// Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced
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// vim: sw=8 ts=8
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char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.24 2004-08-26 06:22:37 fred_nerk Exp $";
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#include <arpa/inet.h>
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <linux/if_tun.h>
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#define SYSLOG_NAMES
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#include <syslog.h>
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#include <malloc.h>
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#include <math.h>
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#include <net/route.h>
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#include <sys/mman.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/wait.h>
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#include <linux/if.h>
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#include <stddef.h>
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#include <time.h>
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#include <dlfcn.h>
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#include <unistd.h>
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#include <sched.h>
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#include <sys/sysinfo.h>
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#include <libcli.h>
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#include "md5.h"
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#include "l2tpns.h"
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#include "cluster.h"
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#include "plugin.h"
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#include "ll.h"
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#include "constants.h"
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#include "control.h"
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#include "util.h"
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#include "tbf.h"
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// Globals
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struct configt *config = NULL; // all configuration
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int tunfd = -1; // tun interface file handle. (network device)
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int udpfd = -1; // UDP file handle
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int controlfd = -1; // Control signal handle
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int snoopfd = -1; // UDP file handle for sending out intercept data
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int *radfds = NULL; // RADIUS requests file handles
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int ifrfd = -1; // File descriptor for routing, etc
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time_t basetime = 0; // base clock
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char hostname[1000] = ""; // us.
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int tunidx; // ifr_ifindex of tun device
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u32 sessionid = 0; // session id for radius accounting
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int syslog_log = 0; // are we logging to syslog
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FILE *log_stream = NULL; // file handle for direct logging (i.e. direct into file, not via syslog).
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extern int cluster_sockfd; // Intra-cluster communications socket.
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u32 last_sid = 0; // Last used PPP SID. Can I kill this?? -- mo
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int clifd = 0; // Socket listening for CLI connections.
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struct cli_session_actions *cli_session_actions = NULL; // Pending session changes requested by CLI
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struct cli_tunnel_actions *cli_tunnel_actions = NULL; // Pending tunnel changes required by CLI
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static void *ip_hash[256]; // Mapping from IP address to session structures.
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u32 udp_tx = 0, udp_rx = 0, udp_rx_pkt = 0; // Global traffic counters.
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u32 eth_tx = 0, eth_rx = 0, eth_rx_pkt = 0;
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u32 ip_pool_size = 1; // Size of the pool of addresses used for dynamic address allocation.
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time_t time_now = 0; // Current time in seconds since epoch.
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char time_now_string[64] = {0}; // Current time as a string.
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char main_quit = 0; // True if we're in the process of exiting.
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char *_program_name = NULL;
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linked_list *loaded_plugins;
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linked_list *plugins[MAX_PLUGIN_TYPES];
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#ifdef BGP
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#include "bgp.h"
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struct bgp_peer *bgp_peers = 0;
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struct bgp_route_list *bgp_routes = 0;
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int bgp_configured = 0;
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#endif /* BGP */
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#define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
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#define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(struct configt, MEMBER), membersize(struct configt, MEMBER), TYPE }
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struct config_descriptt config_values[] = {
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CONFIG("debug", debug, INT),
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CONFIG("log_file", log_filename, STRING),
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CONFIG("pid_file", pid_file, STRING),
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CONFIG("l2tp_secret", l2tpsecret, STRING),
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CONFIG("primary_dns", default_dns1, IP),
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CONFIG("secondary_dns", default_dns2, IP),
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CONFIG("save_state", save_state, BOOL),
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CONFIG("primary_radius", radiusserver[0], IP),
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CONFIG("secondary_radius", radiusserver[1], IP),
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CONFIG("primary_radius_port",radiusport[0], SHORT),
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CONFIG("secondary_radius_port",radiusport[1], SHORT),
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CONFIG("radius_accounting", radius_accounting, BOOL),
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CONFIG("radius_secret", radiussecret, STRING),
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CONFIG("bind_address", bind_address, IP),
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CONFIG("send_garp", send_garp, BOOL),
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CONFIG("throttle_speed", rl_rate, UNSIGNED_LONG),
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CONFIG("accounting_dir", accounting_dir, STRING),
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CONFIG("setuid", target_uid, INT),
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CONFIG("dump_speed", dump_speed, BOOL),
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CONFIG("cleanup_interval", cleanup_interval, INT),
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CONFIG("multi_read_count", multi_read_count, INT),
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CONFIG("scheduler_fifo", scheduler_fifo, BOOL),
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CONFIG("lock_pages", lock_pages, BOOL),
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CONFIG("icmp_rate", icmp_rate, INT),
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CONFIG("cluster_address", cluster_address, IP),
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CONFIG("cluster_interface", cluster_interface, STRING),
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CONFIG("cluster_hb_interval", cluster_hb_interval, INT),
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CONFIG("cluster_hb_timeout", cluster_hb_timeout, INT),
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#ifdef BGP
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CONFIG("as_number", as_number, SHORT),
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CONFIG("bgp_peer1", bgp_peer[0], STRING),
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CONFIG("bgp_peer1_as", bgp_peer_as[0], SHORT),
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CONFIG("bgp_peer2", bgp_peer[1], STRING),
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CONFIG("bgp_peer2_as", bgp_peer_as[1], SHORT),
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#endif /* BGP */
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{ NULL, 0, 0, 0 },
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};
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char *plugin_functions[] = {
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NULL,
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"plugin_pre_auth",
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"plugin_post_auth",
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"plugin_packet_rx",
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"plugin_packet_tx",
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"plugin_timer",
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"plugin_new_session",
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"plugin_kill_session",
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"plugin_control",
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"plugin_radius_response",
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"plugin_become_master",
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"plugin_new_session_master",
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};
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#define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
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tunnelt *tunnel = NULL; // Array of tunnel structures.
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sessiont *session = NULL; // Array of session structures.
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sessioncountt *sess_count = NULL; // Array of partial per-session traffic counters.
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radiust *radius = NULL; // Array of radius structures.
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ippoolt *ip_address_pool = NULL; // Array of dynamic IP addresses.
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controlt *controlfree = 0;
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struct Tstats *_statistics = NULL;
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#ifdef RINGBUFFER
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struct Tringbuffer *ringbuffer = NULL;
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#endif
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void sigalrm_handler(int);
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void sighup_handler(int);
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void sigterm_handler(int);
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void sigquit_handler(int);
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void sigchild_handler(int);
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void read_config_file();
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void read_state();
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void dump_state();
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void tunnel_clean();
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tunnelidt new_tunnel();
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void update_config();
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static void cache_ipmap(ipt ip, int s);
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static void uncache_ipmap(ipt ip);
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// return internal time (10ths since process startup)
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clockt now(void)
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{
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struct timeval t;
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gettimeofday(&t, 0);
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return (t.tv_sec - basetime) * 10 + t.tv_usec / 100000 + 1;
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}
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// work out a retry time based on try number
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// This is a straight bounded exponential backoff.
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// Maximum re-try time is 32 seconds. (2^5).
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clockt backoff(u8 try)
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{
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if (try > 5) try = 5; // max backoff
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return now() + 10 * (1 << try);
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}
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//
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// Log a debug message.
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//
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void _log(int level, ipt address, sessionidt s, tunnelidt t, const char *format, ...)
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{
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static char message[65536] = {0};
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static char message2[65536] = {0};
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va_list ap;
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#ifdef RINGBUFFER
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if (ringbuffer)
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{
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if (++ringbuffer->tail >= RINGBUFFER_SIZE)
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ringbuffer->tail = 0;
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if (ringbuffer->tail == ringbuffer->head)
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if (++ringbuffer->head >= RINGBUFFER_SIZE)
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ringbuffer->head = 0;
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ringbuffer->buffer[ringbuffer->tail].level = level;
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ringbuffer->buffer[ringbuffer->tail].address = address;
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ringbuffer->buffer[ringbuffer->tail].session = s;
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ringbuffer->buffer[ringbuffer->tail].tunnel = t;
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va_start(ap, format);
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vsnprintf(ringbuffer->buffer[ringbuffer->tail].message, 4095, format, ap);
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va_end(ap);
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}
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#endif
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if (config->debug < level) return;
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va_start(ap, format);
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if (log_stream)
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{
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vsnprintf(message2, 65535, format, ap);
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snprintf(message, 65535, "%s %02d/%02d %s", time_now_string, t, s, message2);
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fprintf(log_stream, "%s", message);
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}
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else if (syslog_log)
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{
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vsnprintf(message2, 65535, format, ap);
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snprintf(message, 65535, "%02d/%02d %s", t, s, message2);
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syslog(level + 2, message); // We don't need LOG_EMERG or LOG_ALERT
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}
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va_end(ap);
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}
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void _log_hex(int level, ipt address, sessionidt s, tunnelidt t, const char *title, const char *data, int maxsize)
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{
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int i, j;
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const u8 *d = (const u8 *)data;
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if (config->debug < level) return;
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// No support for log_hex to syslog
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if (log_stream)
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{
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log(level, address, s, t, "%s (%d bytes):\n", title, maxsize);
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setvbuf(log_stream, NULL, _IOFBF, 16384);
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for (i = 0; i < maxsize; )
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{
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fprintf(log_stream, "%4X: ", i);
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for (j = i; j < maxsize && j < (i + 16); j++)
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{
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fprintf(log_stream, "%02X ", d[j]);
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if (j == i + 7)
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fputs(": ", log_stream);
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}
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for (; j < i + 16; j++)
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{
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fputs(" ", log_stream);
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if (j == i + 7)
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fputs(": ", log_stream);
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}
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fputs(" ", log_stream);
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for (j = i; j < maxsize && j < (i + 16); j++)
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{
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if (d[j] >= 0x20 && d[j] < 0x7f && d[j] != 0x20)
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fputc(d[j], log_stream);
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else
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fputc('.', log_stream);
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if (j == i + 7)
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fputs(" ", log_stream);
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}
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i = j;
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fputs("\n", log_stream);
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}
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fflush(log_stream);
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setbuf(log_stream, NULL);
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}
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}
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// Add a route
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//
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// This adds it to the routing table, advertises it
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// via iBGP if enabled, and stuffs it into the
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// 'sessionbyip' cache.
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//
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// 'ip' and 'mask' must be in _host_ order.
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//
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void routeset(sessionidt s, ipt ip, ipt mask, ipt gw, u8 add)
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{
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struct rtentry r;
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int i;
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if (!mask) mask = 0xffffffff;
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ip &= mask; // Force the ip to be the first one in the route.
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memset(&r, 0, sizeof(r));
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r.rt_dev = config->tundevice;
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r.rt_dst.sa_family = AF_INET;
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*(u32 *) & (((struct sockaddr_in *) &r.rt_dst)->sin_addr.s_addr) = htonl(ip);
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r.rt_gateway.sa_family = AF_INET;
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*(u32 *) & (((struct sockaddr_in *) &r.rt_gateway)->sin_addr.s_addr) = htonl(gw);
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r.rt_genmask.sa_family = AF_INET;
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*(u32 *) & (((struct sockaddr_in *) &r.rt_genmask)->sin_addr.s_addr) = htonl(mask);
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r.rt_flags = (RTF_UP | RTF_STATIC);
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if (gw)
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r.rt_flags |= RTF_GATEWAY;
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else if (mask == 0xffffffff)
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r.rt_flags |= RTF_HOST;
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log(1, ip, 0, 0, "Route %s %u.%u.%u.%u/%u.%u.%u.%u %u.%u.%u.%u\n",
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add ? "add" : "del",
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ip >> 24, ip >> 16 & 0xff, ip >> 8 & 0xff, ip & 0xff,
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mask >> 24, mask >> 16 & 0xff, mask >> 8 & 0xff, mask & 0xff,
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gw >> 24, gw >> 16 & 0xff, gw >> 8 & 0xff, gw & 0xff);
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if (ioctl(ifrfd, add ? SIOCADDRT : SIOCDELRT, (void *) &r) < 0)
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log(0, 0, 0, 0, "routeset() error in ioctl: %s\n", strerror(errno));
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#ifdef BGP
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if (add)
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bgp_add_route(htonl(ip), htonl(mask));
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else
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bgp_del_route(htonl(ip), htonl(mask));
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#endif /* BGP */
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// Add/Remove the IPs to the 'sessionbyip' cache.
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// Note that we add the zero address in the case of
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// a network route. Roll on CIDR.
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// Note that 's == 0' implies this is the address pool.
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// We still cache it here, because it will pre-fill
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// the malloc'ed tree.
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if (s)
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{
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if (!add) // Are we deleting a route?
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s = 0; // Caching the session as '0' is the same as uncaching.
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for (i = ip; (i&mask) == (ip&mask) ; ++i)
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cache_ipmap(i, s);
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}
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}
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//
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// Set up TUN interface
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void inittun(void)
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{
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struct ifreq ifr;
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struct sockaddr_in sin = {0};
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memset(&ifr, 0, sizeof(ifr));
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ifr.ifr_flags = IFF_TUN;
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tunfd = open(TUNDEVICE, O_RDWR);
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if (tunfd < 0)
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{ // fatal
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log(0, 0, 0, 0, "Can't open %s: %s\n", TUNDEVICE, strerror(errno));
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exit(1);
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}
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{
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int flags = fcntl(tunfd, F_GETFL, 0);
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fcntl(tunfd, F_SETFL, flags | O_NONBLOCK);
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}
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if (ioctl(tunfd, TUNSETIFF, (void *) &ifr) < 0)
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{
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log(0, 0, 0, 0, "Can't set tun interface: %s\n", strerror(errno));
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exit(1);
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}
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assert(strlen(ifr.ifr_name) < sizeof(config->tundevice));
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strncpy(config->tundevice, ifr.ifr_name, sizeof(config->tundevice) - 1);
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ifrfd = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
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sin.sin_family = AF_INET;
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sin.sin_addr.s_addr = config->bind_address ? config->bind_address : 0x01010101; // 1.1.1.1
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memcpy(&ifr.ifr_addr, &sin, sizeof(struct sockaddr));
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if (ioctl(ifrfd, SIOCSIFADDR, (void *) &ifr) < 0)
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{
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log(0, 0, 0, 0, "Error setting tun address: %s\n", strerror(errno));
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exit(1);
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}
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/* Bump up the qlen to deal with bursts from the network */
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ifr.ifr_qlen = 1000;
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if (ioctl(ifrfd, SIOCSIFTXQLEN, (void *) &ifr) < 0)
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{
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log(0, 0, 0, 0, "Error setting tun queue length: %s\n", strerror(errno));
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exit(1);
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}
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ifr.ifr_flags = IFF_UP;
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if (ioctl(ifrfd, SIOCSIFFLAGS, (void *) &ifr) < 0)
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{
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log(0, 0, 0, 0, "Error setting tun flags: %s\n", strerror(errno));
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exit(1);
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}
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if (ioctl(ifrfd, SIOCGIFINDEX, (void *) &ifr) < 0)
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{
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log(0, 0, 0, 0, "Error setting tun ifindex: %s\n", strerror(errno));
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exit(1);
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}
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tunidx = ifr.ifr_ifindex;
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}
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// set up UDP port
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void initudp(void)
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{
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int on = 1;
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struct sockaddr_in addr;
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// Tunnel
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memset(&addr, 0, sizeof(addr));
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addr.sin_family = AF_INET;
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addr.sin_port = htons(L2TPPORT);
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addr.sin_addr.s_addr = config->bind_address;
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udpfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
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setsockopt(udpfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
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{
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int flags = fcntl(udpfd, F_GETFL, 0);
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fcntl(udpfd, F_SETFL, flags | O_NONBLOCK);
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}
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if (bind(udpfd, (void *) &addr, sizeof(addr)) < 0)
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{
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log(0, 0, 0, 0, "Error in UDP bind: %s\n", strerror(errno));
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exit(1);
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}
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snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
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// Control
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memset(&addr, 0, sizeof(addr));
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addr.sin_family = AF_INET;
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addr.sin_port = htons(1702);
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controlfd = socket(AF_INET, SOCK_DGRAM, 17);
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setsockopt(controlfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
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if (bind(controlfd, (void *) &addr, sizeof(addr)) < 0)
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{
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log(0, 0, 0, 0, "Error in control bind: %s\n", strerror(errno));
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exit(1);
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}
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}
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//
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// Find session by IP, < 1 for not found
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//
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// Confusingly enough, this 'ip' must be
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// in _network_ order. This being the common
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// case when looking it up from IP packet headers.
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//
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// We actually use this cache for two things.
|
|
// #1. For used IP addresses, this maps to the
|
|
// session ID that it's used by.
|
|
// #2. For un-used IP addresses, this maps to the
|
|
// index into the pool table that contains that
|
|
// IP address.
|
|
//
|
|
|
|
int lookup_ipmap(ipt ip)
|
|
{
|
|
u8 *a = (u8 *)&ip;
|
|
char **d = (char **) ip_hash;
|
|
int s;
|
|
|
|
if (!(d = (char **) d[(size_t) *a++])) return 0;
|
|
if (!(d = (char **) d[(size_t) *a++])) return 0;
|
|
if (!(d = (char **) d[(size_t) *a++])) return 0;
|
|
|
|
s = (ipt) d[(size_t) *a];
|
|
return s;
|
|
}
|
|
|
|
sessionidt sessionbyip(ipt ip)
|
|
{
|
|
int s = lookup_ipmap(ip);
|
|
CSTAT(call_sessionbyip);
|
|
|
|
if (s > 0 && s < MAXSESSION && session[s].tunnel)
|
|
return s;
|
|
return 0;
|
|
}
|
|
|
|
//
|
|
// Take an IP address in HOST byte order and
|
|
// add it to the sessionid by IP cache.
|
|
//
|
|
// (It's actually cached in network order)
|
|
//
|
|
static void cache_ipmap(ipt ip, int s)
|
|
{
|
|
ipt nip = htonl(ip); // MUST be in network order. I.e. MSB must in be ((char*)(&ip))[0]
|
|
u8 *a = (u8 *) &nip;
|
|
char **d = (char **) ip_hash;
|
|
int i;
|
|
|
|
for (i = 0; i < 3; i++)
|
|
{
|
|
if (!d[(size_t) a[i]])
|
|
{
|
|
if (!(d[(size_t) a[i]] = calloc(256, sizeof (void *))))
|
|
return;
|
|
}
|
|
|
|
d = (char **) d[(size_t) a[i]];
|
|
}
|
|
|
|
d[(size_t) a[3]] = (char *)((int)s);
|
|
|
|
if (s > 0)
|
|
log(4, ip, s, session[s].tunnel, "Caching ip address %s\n", inet_toa(nip));
|
|
else if (s == 0)
|
|
log(4, ip, 0, 0, "Un-caching ip address %s\n", inet_toa(nip));
|
|
// else a map to an ip pool index.
|
|
}
|
|
|
|
static void uncache_ipmap(ipt ip)
|
|
{
|
|
cache_ipmap(ip, 0); // Assign it to the NULL session.
|
|
}
|
|
|
|
//
|
|
// CLI list to dump current ipcache.
|
|
//
|
|
int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc)
|
|
{
|
|
char **d = (char **) ip_hash, **e, **f, **g;
|
|
int i, j, k, l;
|
|
int count = 0;
|
|
|
|
if (CLI_HELP_REQUESTED)
|
|
return CLI_HELP_NO_ARGS;
|
|
|
|
cli_print(cli, "%7s %s", "Sess#", "IP Address");
|
|
|
|
for (i = 0; i < 256; ++i)
|
|
{
|
|
if (!d[i])
|
|
continue;
|
|
e = (char**) d[i];
|
|
for (j = 0; j < 256; ++j)
|
|
{
|
|
if (!e[j])
|
|
continue;
|
|
f = (char**) e[j];
|
|
for (k = 0; k < 256; ++k)
|
|
{
|
|
if (!f[k])
|
|
continue;
|
|
g = (char**)f[k];
|
|
for (l = 0; l < 256; ++l)
|
|
{
|
|
if (!g[l])
|
|
continue;
|
|
cli_print(cli, "%7d %d.%d.%d.%d", (int) g[l], i, j, k, l);
|
|
++count;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
cli_print(cli, "%d entries in cache", count);
|
|
return CLI_OK;
|
|
}
|
|
|
|
|
|
// Find session by username, 0 for not found
|
|
// walled garden users aren't authenticated, so the username is
|
|
// reasonably useless. Ignore them to avoid incorrect actions
|
|
//
|
|
// This is VERY inefficent. Don't call it often. :)
|
|
//
|
|
sessionidt sessionbyuser(char *username)
|
|
{
|
|
int s;
|
|
CSTAT(call_sessionbyuser);
|
|
|
|
for (s = 1; s < MAXSESSION ; ++s)
|
|
{
|
|
if (session[s].walled_garden)
|
|
continue; // Skip walled garden users.
|
|
|
|
if (!strncmp(session[s].user, username, 128))
|
|
return s;
|
|
|
|
}
|
|
return 0; // Not found.
|
|
}
|
|
|
|
void send_garp(ipt ip)
|
|
{
|
|
int s;
|
|
struct ifreq ifr;
|
|
u8 mac[6];
|
|
|
|
s = socket(PF_INET, SOCK_DGRAM, 0);
|
|
if (s < 0)
|
|
{
|
|
log(0, 0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno));
|
|
return;
|
|
}
|
|
memset(&ifr, 0, sizeof(ifr));
|
|
strncpy(ifr.ifr_name, "eth0", sizeof(ifr.ifr_name) - 1);
|
|
if (ioctl(s, SIOCGIFHWADDR, &ifr) < 0)
|
|
{
|
|
log(0, 0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno));
|
|
close(s);
|
|
return;
|
|
}
|
|
memcpy(mac, &ifr.ifr_hwaddr.sa_data, 6*sizeof(char));
|
|
if (ioctl(s, SIOCGIFINDEX, &ifr) < 0)
|
|
{
|
|
log(0, 0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno));
|
|
close(s);
|
|
return;
|
|
}
|
|
close(s);
|
|
sendarp(ifr.ifr_ifindex, mac, ip);
|
|
}
|
|
|
|
// Find session by username, 0 for not found
|
|
sessiont *sessiontbysessionidt(sessionidt s)
|
|
{
|
|
if (!s || s > MAXSESSION) return NULL;
|
|
return &session[s];
|
|
}
|
|
|
|
sessionidt sessionidtbysessiont(sessiont *s)
|
|
{
|
|
sessionidt val = s-session;
|
|
if (s < session || val > MAXSESSION) return 0;
|
|
return val;
|
|
}
|
|
|
|
// actually send a control message for a specific tunnel
|
|
void tunnelsend(u8 * buf, u16 l, tunnelidt t)
|
|
{
|
|
struct sockaddr_in addr;
|
|
|
|
CSTAT(call_tunnelsend);
|
|
|
|
if (!t)
|
|
{
|
|
static int backtrace_count = 0;
|
|
log(0, 0, 0, t, "tunnelsend called with 0 as tunnel id\n");
|
|
STAT(tunnel_tx_errors);
|
|
log_backtrace(backtrace_count, 5)
|
|
return;
|
|
}
|
|
|
|
if (!tunnel[t].ip)
|
|
{
|
|
static int backtrace_count = 0;
|
|
log(1, 0, 0, t, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
|
|
log_backtrace(backtrace_count, 5)
|
|
STAT(tunnel_tx_errors);
|
|
return;
|
|
}
|
|
memset(&addr, 0, sizeof(addr));
|
|
addr.sin_family = AF_INET;
|
|
*(u32 *) & addr.sin_addr = htonl(tunnel[t].ip);
|
|
addr.sin_port = htons(tunnel[t].port);
|
|
|
|
// sequence expected, if sequence in message
|
|
if (*buf & 0x08) *(u16 *) (buf + ((*buf & 0x40) ? 10 : 8)) = htons(tunnel[t].nr);
|
|
|
|
// If this is a control message, deal with retries
|
|
if (*buf & 0x80)
|
|
{
|
|
tunnel[t].last = time_now; // control message sent
|
|
tunnel[t].retry = backoff(tunnel[t].try); // when to resend
|
|
if (tunnel[t].try > 1)
|
|
{
|
|
STAT(tunnel_retries);
|
|
log(3, tunnel[t].ip, 0, t, "Control message resend try %d\n", tunnel[t].try);
|
|
}
|
|
}
|
|
|
|
if (sendto(udpfd, buf, l, 0, (void *) &addr, sizeof(addr)) < 0)
|
|
{
|
|
log(0, tunnel[t].ip, ntohs((*(u16 *) (buf + 6))), t, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
|
|
strerror(errno), udpfd, buf, l, inet_ntoa(addr.sin_addr));
|
|
STAT(tunnel_tx_errors);
|
|
return;
|
|
}
|
|
|
|
log_hex(5, "Send Tunnel Data", buf, l);
|
|
STAT(tunnel_tx_packets);
|
|
INC_STAT(tunnel_tx_bytes, l);
|
|
}
|
|
|
|
//
|
|
// Tiny helper function to write data to
|
|
// the 'tun' device.
|
|
//
|
|
int tun_write(u8 * data, int size)
|
|
{
|
|
return write(tunfd, data, size);
|
|
}
|
|
|
|
// process outgoing (to tunnel) IP
|
|
//
|
|
void processipout(u8 * buf, int len)
|
|
{
|
|
sessionidt s;
|
|
sessiont *sp;
|
|
tunnelidt t;
|
|
ipt ip;
|
|
|
|
char * data = buf; // Keep a copy of the originals.
|
|
int size = len;
|
|
|
|
u8 b[MAXETHER + 20];
|
|
|
|
CSTAT(call_processipout);
|
|
|
|
if (len < MIN_IP_SIZE)
|
|
{
|
|
log(1, 0, 0, 0, "Short IP, %d bytes\n", len);
|
|
STAT(tunnel_tx_errors);
|
|
return;
|
|
}
|
|
if (len >= MAXETHER)
|
|
{
|
|
log(1, 0, 0, 0, "Oversize IP packet %d bytes\n", len);
|
|
STAT(tunnel_tx_errors);
|
|
return;
|
|
}
|
|
|
|
// Skip the tun header
|
|
buf += 4;
|
|
len -= 4;
|
|
|
|
// Got an IP header now
|
|
if (*(u8 *)(buf) >> 4 != 4)
|
|
{
|
|
log(1, 0, 0, 0, "IP: Don't understand anything except IPv4\n");
|
|
return;
|
|
}
|
|
|
|
ip = *(u32 *)(buf + 16);
|
|
if (!(s = sessionbyip(ip)))
|
|
{
|
|
// Is this a packet for a session that doesn't exist?
|
|
static int rate = 0; // Number of ICMP packets we've sent this second.
|
|
static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
|
|
|
|
if (last != time_now)
|
|
{
|
|
last = time_now;
|
|
rate = 0;
|
|
}
|
|
|
|
if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
|
|
{
|
|
log(4, 0, 0, 0, "IP: Sending ICMP host unreachable to %s\n", inet_toa(*(u32 *)(buf + 12)));
|
|
host_unreachable(*(u32 *)(buf + 12), *(u16 *)(buf + 4), ip, buf, (len < 64) ? 64 : len);
|
|
}
|
|
return;
|
|
}
|
|
t = session[s].tunnel;
|
|
sp = &session[s];
|
|
|
|
if (sp->tbf_out)
|
|
{
|
|
// Are we throttling this session?
|
|
if (config->cluster_iam_master)
|
|
tbf_queue_packet(sp->tbf_out, data, size);
|
|
else
|
|
master_throttle_packet(sp->tbf_out, data, size);
|
|
return;
|
|
}
|
|
else if (sp->walled_garden && !config->cluster_iam_master)
|
|
{
|
|
// We are walled-gardening this
|
|
master_garden_packet(s, data, size);
|
|
return;
|
|
}
|
|
|
|
// Snooping this session, send it to intercept box
|
|
if (sp->snoop_ip && sp->snoop_port)
|
|
snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
|
|
|
|
log(5, session[s].ip, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
|
|
|
|
// Add on L2TP header
|
|
{
|
|
u8 *p = makeppp(b, sizeof(b), buf, len, t, s, PPPIP);
|
|
if (!p)
|
|
{
|
|
log(3, session[s].ip, s, t, "failed to send packet in processipout.\n");
|
|
return;
|
|
}
|
|
tunnelsend(b, len + (p-b), t); // send it...
|
|
}
|
|
|
|
sp->cout += len; // byte count
|
|
sp->total_cout += len; // byte count
|
|
sp->pout++;
|
|
udp_tx += len;
|
|
sess_count[s].cout += len; // To send to master..
|
|
}
|
|
|
|
//
|
|
// Helper routine for the TBF filters.
|
|
// Used to send queued data in to the user!
|
|
//
|
|
void send_ipout(sessionidt s, u8 *buf, int len)
|
|
{
|
|
sessiont *sp;
|
|
tunnelidt t;
|
|
ipt ip;
|
|
|
|
u8 b[MAXETHER + 20];
|
|
|
|
if (len < 0 || len > MAXETHER)
|
|
{
|
|
log(1,0,0,0, "Odd size IP packet: %d bytes\n", len);
|
|
return;
|
|
}
|
|
|
|
// Skip the tun header
|
|
buf += 4;
|
|
len -= 4;
|
|
|
|
ip = *(u32 *)(buf + 16);
|
|
|
|
if (!session[s].ip)
|
|
return;
|
|
t = session[s].tunnel;
|
|
sp = &session[s];
|
|
|
|
log(5, session[s].ip, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
|
|
|
|
// Snooping this session.
|
|
if (sp->snoop_ip && sp->snoop_port)
|
|
snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
|
|
|
|
// Add on L2TP header
|
|
{
|
|
u8 *p = makeppp(b, sizeof(b), buf, len, t, s, PPPIP);
|
|
if (!p)
|
|
{
|
|
log(3, session[s].ip, s, t, "failed to send packet in send_ipout.\n");
|
|
return;
|
|
}
|
|
tunnelsend(b, len + (p-b), t); // send it...
|
|
}
|
|
sp->cout += len; // byte count
|
|
sp->total_cout += len; // byte count
|
|
sp->pout++;
|
|
udp_tx += len;
|
|
sess_count[s].cout += len; // To send to master..
|
|
}
|
|
|
|
// add an AVP (16 bit)
|
|
void control16(controlt * c, u16 avp, u16 val, u8 m)
|
|
{
|
|
u16 l = (m ? 0x8008 : 0x0008);
|
|
*(u16 *) (c->buf + c->length + 0) = htons(l);
|
|
*(u16 *) (c->buf + c->length + 2) = htons(0);
|
|
*(u16 *) (c->buf + c->length + 4) = htons(avp);
|
|
*(u16 *) (c->buf + c->length + 6) = htons(val);
|
|
c->length += 8;
|
|
}
|
|
|
|
// add an AVP (32 bit)
|
|
void control32(controlt * c, u16 avp, u32 val, u8 m)
|
|
{
|
|
u16 l = (m ? 0x800A : 0x000A);
|
|
*(u16 *) (c->buf + c->length + 0) = htons(l);
|
|
*(u16 *) (c->buf + c->length + 2) = htons(0);
|
|
*(u16 *) (c->buf + c->length + 4) = htons(avp);
|
|
*(u32 *) (c->buf + c->length + 6) = htonl(val);
|
|
c->length += 10;
|
|
}
|
|
|
|
// add an AVP (32 bit)
|
|
void controls(controlt * c, u16 avp, char *val, u8 m)
|
|
{
|
|
u16 l = ((m ? 0x8000 : 0) + strlen(val) + 6);
|
|
*(u16 *) (c->buf + c->length + 0) = htons(l);
|
|
*(u16 *) (c->buf + c->length + 2) = htons(0);
|
|
*(u16 *) (c->buf + c->length + 4) = htons(avp);
|
|
memcpy(c->buf + c->length + 6, val, strlen(val));
|
|
c->length += 6 + strlen(val);
|
|
}
|
|
|
|
// add a binary AVP
|
|
void controlb(controlt * c, u16 avp, char *val, unsigned int len, u8 m)
|
|
{
|
|
u16 l = ((m ? 0x8000 : 0) + len + 6);
|
|
*(u16 *) (c->buf + c->length + 0) = htons(l);
|
|
*(u16 *) (c->buf + c->length + 2) = htons(0);
|
|
*(u16 *) (c->buf + c->length + 4) = htons(avp);
|
|
memcpy(c->buf + c->length + 6, val, len);
|
|
c->length += 6 + len;
|
|
}
|
|
|
|
// new control connection
|
|
controlt *controlnew(u16 mtype)
|
|
{
|
|
controlt *c;
|
|
if (!controlfree)
|
|
c = malloc(sizeof(controlt));
|
|
else
|
|
{
|
|
c = controlfree;
|
|
controlfree = c->next;
|
|
}
|
|
assert(c);
|
|
c->next = 0;
|
|
*(u16 *) (c->buf + 0) = htons(0xC802); // flags/ver
|
|
c->length = 12;
|
|
control16(c, 0, mtype, 1);
|
|
return c;
|
|
}
|
|
|
|
// send zero block if nothing is waiting
|
|
// (ZLB send).
|
|
void controlnull(tunnelidt t)
|
|
{
|
|
u8 buf[12];
|
|
if (tunnel[t].controlc) // Messages queued; They will carry the ack.
|
|
return;
|
|
|
|
*(u16 *) (buf + 0) = htons(0xC802); // flags/ver
|
|
*(u16 *) (buf + 2) = htons(12); // length
|
|
*(u16 *) (buf + 4) = htons(tunnel[t].far); // tunnel
|
|
*(u16 *) (buf + 6) = htons(0); // session
|
|
*(u16 *) (buf + 8) = htons(tunnel[t].ns); // sequence
|
|
*(u16 *) (buf + 10) = htons(tunnel[t].nr); // sequence
|
|
tunnelsend(buf, 12, t);
|
|
}
|
|
|
|
// add a control message to a tunnel, and send if within window
|
|
void controladd(controlt * c, tunnelidt t, sessionidt s)
|
|
{
|
|
*(u16 *) (c->buf + 2) = htons(c->length); // length
|
|
*(u16 *) (c->buf + 4) = htons(tunnel[t].far); // tunnel
|
|
*(u16 *) (c->buf + 6) = htons(s ? session[s].far : 0); // session
|
|
*(u16 *) (c->buf + 8) = htons(tunnel[t].ns); // sequence
|
|
tunnel[t].ns++; // advance sequence
|
|
// link in message in to queue
|
|
if (tunnel[t].controlc)
|
|
tunnel[t].controle->next = c;
|
|
else
|
|
tunnel[t].controls = c;
|
|
tunnel[t].controle = c;
|
|
tunnel[t].controlc++;
|
|
// send now if space in window
|
|
if (tunnel[t].controlc <= tunnel[t].window)
|
|
{
|
|
tunnel[t].try = 0; // first send
|
|
tunnelsend(c->buf, c->length, t);
|
|
}
|
|
}
|
|
|
|
//
|
|
// Throttle or Unthrottle a session
|
|
//
|
|
// Throttle the data folling through a session
|
|
// to be no more than 'throttle' kbit/sec each way.
|
|
//
|
|
int throttle_session(sessionidt s, int throttle)
|
|
{
|
|
if (!session[s].tunnel)
|
|
return 0; // No-one home.
|
|
|
|
if (!*session[s].user)
|
|
return 0; // User not logged in
|
|
|
|
if (throttle)
|
|
{
|
|
int rate_in = throttle & 0x0000FFFF;
|
|
int rate_out = throttle >> 16;
|
|
|
|
if (session[s].tbf_in || session[s].tbf_out)
|
|
{
|
|
if (throttle == session[s].throttle)
|
|
return 1;
|
|
|
|
// Currently throttled but the rate is changing.
|
|
|
|
free_tbf(session[s].tbf_in);
|
|
free_tbf(session[s].tbf_out);
|
|
}
|
|
|
|
if (rate_in) session[s].tbf_in = new_tbf(s, rate_in * 1024 / 4, rate_in * 1024 / 8, send_ipin);
|
|
if (rate_out) session[s].tbf_out = new_tbf(s, rate_out * 1024 / 4, rate_out * 1024 / 8, send_ipout);
|
|
|
|
if (throttle != session[s].throttle)
|
|
{
|
|
// Changed. Flood to slaves.
|
|
session[s].throttle = throttle;
|
|
cluster_send_session(s);
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
// else Unthrottling.
|
|
|
|
if (!session[s].tbf_in && !session[s].tbf_out && !session[s].throttle)
|
|
return 0;
|
|
|
|
free_tbf(session[s].tbf_in);
|
|
session[s].tbf_in = 0;
|
|
|
|
free_tbf(session[s].tbf_out);
|
|
session[s].tbf_out = 0;
|
|
|
|
if (throttle != session[s].throttle)
|
|
{
|
|
// Changed. Flood to slaves.
|
|
session[s].throttle = throttle;
|
|
cluster_send_session(s);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
// start tidy shutdown of session
|
|
void sessionshutdown(sessionidt s, char *reason)
|
|
{
|
|
int dead = session[s].die;
|
|
int walled_garden = session[s].walled_garden;
|
|
|
|
|
|
CSTAT(call_sessionshutdown);
|
|
|
|
if (!session[s].tunnel)
|
|
{
|
|
log(3, session[s].ip, s, session[s].tunnel, "Called sessionshutdown on a session with no tunnel.\n");
|
|
return; // not a live session
|
|
}
|
|
|
|
if (!dead)
|
|
log(2, 0, s, session[s].tunnel, "Shutting down session %d: %s\n", s, reason);
|
|
|
|
session[s].die = now() + 150; // Clean up in 15 seconds
|
|
|
|
{
|
|
struct param_kill_session data = { &tunnel[session[s].tunnel], &session[s] };
|
|
run_plugins(PLUGIN_KILL_SESSION, &data);
|
|
}
|
|
|
|
// RADIUS Stop message
|
|
if (session[s].opened && !walled_garden && !dead)
|
|
{
|
|
u16 r = session[s].radius;
|
|
if (!r)
|
|
{
|
|
if (!(r = radiusnew(s)))
|
|
{
|
|
log(1, 0, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n");
|
|
STAT(radius_overflow);
|
|
}
|
|
else
|
|
{
|
|
int n;
|
|
for (n = 0; n < 15; n++)
|
|
radius[r].auth[n] = rand();
|
|
}
|
|
}
|
|
if (r && radius[r].state != RADIUSSTOP)
|
|
radiussend(r, RADIUSSTOP); // stop, if not already trying
|
|
}
|
|
|
|
if (session[s].ip)
|
|
{ // IP allocated, clear and unroute
|
|
int r;
|
|
for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
|
|
{
|
|
routeset(s, session[s].route[r].ip, session[s].route[r].mask, session[s].ip, 0);
|
|
session[s].route[r].ip = 0;
|
|
}
|
|
|
|
if (session[s].ip_pool_index == -1) // static ip
|
|
{
|
|
routeset(s, session[s].ip, 0, 0, 0); // Delete route.
|
|
session[s].ip = 0;
|
|
}
|
|
else
|
|
free_ip_address(s);
|
|
|
|
if (session[s].throttle) // Unthrottle if throttled.
|
|
throttle_session(s, 0);
|
|
}
|
|
{ // Send CDN
|
|
controlt *c = controlnew(14); // sending CDN
|
|
control16(c, 1, 3, 1); // result code (admin reasons - TBA make error, general error, add message
|
|
control16(c, 14, s, 1); // assigned session (our end)
|
|
controladd(c, session[s].tunnel, s); // send the message
|
|
}
|
|
cluster_send_session(s);
|
|
}
|
|
|
|
void sendipcp(tunnelidt t, sessionidt s)
|
|
{
|
|
u8 buf[MAXCONTROL];
|
|
u16 r = session[s].radius;
|
|
u8 *q;
|
|
|
|
CSTAT(call_sendipcp);
|
|
|
|
if (!r)
|
|
r = radiusnew(s);
|
|
|
|
if (radius[r].state != RADIUSIPCP)
|
|
{
|
|
radius[r].state = RADIUSIPCP;
|
|
radius[r].try = 0;
|
|
}
|
|
|
|
radius[r].retry = backoff(radius[r].try++);
|
|
if (radius[r].try > 10)
|
|
{
|
|
radiusclear(r, s); // Clear radius session.
|
|
sessionshutdown(s, "No reply on IPCP");
|
|
return;
|
|
}
|
|
|
|
q = makeppp(buf,sizeof(buf), 0, 0, t, s, PPPIPCP);
|
|
if (!q)
|
|
{
|
|
log(3, session[s].ip, s, t, "failed to send packet in sendipcp.\n");
|
|
return;
|
|
}
|
|
|
|
*q = ConfigReq;
|
|
q[1] = r << RADIUS_SHIFT; // ID, dont care, we only send one type of request
|
|
*(u16 *) (q + 2) = htons(10);
|
|
q[4] = 3;
|
|
q[5] = 6;
|
|
*(u32 *) (q + 6) = config->bind_address ? config->bind_address : my_address; // send my IP
|
|
tunnelsend(buf, 10 + (q - buf), t); // send it
|
|
session[s].flags &= ~SF_IPCP_ACKED; // Clear flag.
|
|
}
|
|
|
|
// kill a session now
|
|
void sessionkill(sessionidt s, char *reason)
|
|
{
|
|
|
|
CSTAT(call_sessionkill);
|
|
|
|
session[s].die = now();
|
|
sessionshutdown(s, reason); // close radius/routes, etc.
|
|
if (session[s].radius)
|
|
radiusclear(session[s].radius, s); // cant send clean accounting data, session is killed
|
|
|
|
log(2, 0, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason);
|
|
|
|
throttle_session(s, 0); // Force session to be un-throttle. Free'ing TBF structures.
|
|
|
|
memset(&session[s], 0, sizeof(session[s]));
|
|
session[s].tunnel = T_FREE; // Mark it as free.
|
|
session[s].next = sessionfree;
|
|
sessionfree = s;
|
|
cli_session_actions[s].action = 0;
|
|
cluster_send_session(s);
|
|
}
|
|
|
|
// kill a tunnel now
|
|
void tunnelkill(tunnelidt t, char *reason)
|
|
{
|
|
sessionidt s;
|
|
controlt *c;
|
|
|
|
CSTAT(call_tunnelkill);
|
|
|
|
tunnel[t].state = TUNNELDIE;
|
|
|
|
// free control messages
|
|
while ((c = tunnel[t].controls))
|
|
{
|
|
controlt * n = c->next;
|
|
tunnel[t].controls = n;
|
|
tunnel[t].controlc--;
|
|
c->next = controlfree;
|
|
controlfree = c;
|
|
}
|
|
// kill sessions
|
|
for (s = 1; s < MAXSESSION; s++)
|
|
if (session[s].tunnel == t)
|
|
sessionkill(s, reason);
|
|
|
|
// free tunnel
|
|
tunnelclear(t);
|
|
log(1, 0, 0, t, "Kill tunnel %d: %s\n", t, reason);
|
|
cli_tunnel_actions[s].action = 0;
|
|
cluster_send_tunnel(t);
|
|
}
|
|
|
|
// shut down a tunnel cleanly
|
|
void tunnelshutdown(tunnelidt t, char *reason)
|
|
{
|
|
sessionidt s;
|
|
|
|
CSTAT(call_tunnelshutdown);
|
|
|
|
if (!tunnel[t].last || !tunnel[t].far || tunnel[t].state == TUNNELFREE)
|
|
{
|
|
// never set up, can immediately kill
|
|
tunnelkill(t, reason);
|
|
return;
|
|
}
|
|
log(1, 0, 0, t, "Shutting down tunnel %d (%s)\n", t, reason);
|
|
|
|
// close session
|
|
for (s = 1; s < MAXSESSION; s++)
|
|
if (session[s].tunnel == t)
|
|
sessionkill(s, reason);
|
|
|
|
tunnel[t].state = TUNNELDIE;
|
|
tunnel[t].die = now() + 700; // Clean up in 70 seconds
|
|
cluster_send_tunnel(t);
|
|
// TBA - should we wait for sessions to stop?
|
|
{ // Send StopCCN
|
|
controlt *c = controlnew(4); // sending StopCCN
|
|
control16(c, 1, 1, 1); // result code (admin reasons - TBA make error, general error, add message
|
|
control16(c, 9, t, 1); // assigned tunnel (our end)
|
|
controladd(c, t, 0); // send the message
|
|
}
|
|
}
|
|
|
|
// read and process packet on tunnel (UDP)
|
|
void processudp(u8 * buf, int len, struct sockaddr_in *addr)
|
|
{
|
|
char *chapresponse = NULL;
|
|
u16 l = len, t = 0, s = 0, ns = 0, nr = 0;
|
|
u8 *p = buf + 2;
|
|
|
|
|
|
CSTAT(call_processudp);
|
|
|
|
udp_rx += len;
|
|
udp_rx_pkt++;
|
|
log_hex(5, "UDP Data", buf, len);
|
|
STAT(tunnel_rx_packets);
|
|
INC_STAT(tunnel_rx_bytes, len);
|
|
if (len < 6)
|
|
{
|
|
log(1, ntohl(addr->sin_addr.s_addr), 0, 0, "Short UDP, %d bytes\n", len);
|
|
STAT(tunnel_rx_errors);
|
|
return;
|
|
}
|
|
if ((buf[1] & 0x0F) != 2)
|
|
{
|
|
log(1, ntohl(addr->sin_addr.s_addr), 0, 0, "Bad L2TP ver %d\n", (buf[1] & 0x0F) != 2);
|
|
STAT(tunnel_rx_errors);
|
|
return;
|
|
}
|
|
if (*buf & 0x40)
|
|
{ // length
|
|
l = ntohs(*(u16 *) p);
|
|
p += 2;
|
|
}
|
|
t = ntohs(*(u16 *) p);
|
|
p += 2;
|
|
s = ntohs(*(u16 *) p);
|
|
p += 2;
|
|
if (s >= MAXSESSION)
|
|
{
|
|
log(1, ntohl(addr->sin_addr.s_addr), s, t, "Received UDP packet with invalid session ID\n");
|
|
STAT(tunnel_rx_errors);
|
|
return;
|
|
}
|
|
if (t >= MAXTUNNEL)
|
|
{
|
|
log(1, ntohl(addr->sin_addr.s_addr), s, t, "Received UDP packet with invalid tunnel ID\n");
|
|
STAT(tunnel_rx_errors);
|
|
return;
|
|
}
|
|
if (*buf & 0x08)
|
|
{ // ns/nr
|
|
ns = ntohs(*(u16 *) p);
|
|
p += 2;
|
|
nr = ntohs(*(u16 *) p);
|
|
p += 2;
|
|
}
|
|
if (*buf & 0x02)
|
|
{ // offset
|
|
u16 o = ntohs(*(u16 *) p);
|
|
p += o + 2;
|
|
}
|
|
if ((p - buf) > l)
|
|
{
|
|
log(1, ntohl(addr->sin_addr.s_addr), s, t, "Bad length %d>%d\n", (p - buf), l);
|
|
STAT(tunnel_rx_errors);
|
|
return;
|
|
}
|
|
l -= (p - buf);
|
|
if (*buf & 0x80)
|
|
{ // control
|
|
u16 message = 0xFFFF; // message type
|
|
u8 fatal = 0;
|
|
u8 mandatorymessage = 0;
|
|
u8 chap = 0; // if CHAP being used
|
|
u16 asession = 0; // assigned session
|
|
u32 amagic = 0; // magic number
|
|
u8 aflags = 0; // flags from last LCF
|
|
u16 version = 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
|
|
int requestchap = 0; // do we request PAP instead of original CHAP request?
|
|
char called[MAXTEL] = ""; // called number
|
|
char calling[MAXTEL] = ""; // calling number
|
|
|
|
if (!config->cluster_iam_master)
|
|
{
|
|
master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
|
|
return;
|
|
}
|
|
|
|
if ((*buf & 0xCA) != 0xC8)
|
|
{
|
|
log(1, ntohl(addr->sin_addr.s_addr), s, t, "Bad control header %02X\n", *buf);
|
|
STAT(tunnel_rx_errors);
|
|
return;
|
|
}
|
|
log(3, ntohl(addr->sin_addr.s_addr), s, t, "Control message (%d bytes): (unacked %d) l-ns %d l-nr %d r-ns %d r-nr %d\n",
|
|
l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr);
|
|
// if no tunnel specified, assign one
|
|
if (!t)
|
|
{
|
|
int i;
|
|
|
|
//
|
|
// Is this a duplicate of the first packet? (SCCRQ)
|
|
//
|
|
for (i = 1; i <= config->cluster_highest_tunnelid ; ++i)
|
|
{
|
|
if (tunnel[i].state != TUNNELOPENING ||
|
|
tunnel[i].ip != ntohl(*(ipt *) & addr->sin_addr) ||
|
|
tunnel[i].port != ntohs(addr->sin_port) )
|
|
continue;
|
|
t = i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!t)
|
|
{
|
|
if (!(t = new_tunnel()))
|
|
{
|
|
log(1, ntohl(addr->sin_addr.s_addr), 0, 0, "No more tunnels\n");
|
|
STAT(tunnel_overflow);
|
|
return;
|
|
}
|
|
tunnelclear(t);
|
|
tunnel[t].ip = ntohl(*(ipt *) & addr->sin_addr);
|
|
tunnel[t].port = ntohs(addr->sin_port);
|
|
tunnel[t].window = 4; // default window
|
|
log(1, ntohl(addr->sin_addr.s_addr), 0, t, " New tunnel from %u.%u.%u.%u/%u ID %d\n", tunnel[t].ip >> 24, tunnel[t].ip >> 16 & 255, tunnel[t].ip >> 8 & 255, tunnel[t].ip & 255, tunnel[t].port, t);
|
|
STAT(tunnel_created);
|
|
}
|
|
|
|
// This is used to time out old tunnels
|
|
tunnel[t].lastrec = time_now;
|
|
|
|
// check sequence of this message
|
|
{
|
|
int skip = tunnel[t].window; // track how many in-window packets are still in queue
|
|
// some to clear maybe?
|
|
while (tunnel[t].controlc && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000))
|
|
{
|
|
controlt *c = tunnel[t].controls;
|
|
tunnel[t].controls = c->next;
|
|
tunnel[t].controlc--;
|
|
c->next = controlfree;
|
|
controlfree = c;
|
|
skip--;
|
|
tunnel[t].try = 0; // we have progress
|
|
}
|
|
|
|
// If the 'ns' just received is not the 'nr' we're
|
|
// expecting, just send an ack and drop it.
|
|
//
|
|
// if 'ns' is less, then we got a retransmitted packet.
|
|
// if 'ns' is greater than missed a packet. Either way
|
|
// we should ignore it.
|
|
if (ns != tunnel[t].nr)
|
|
{
|
|
// is this the sequence we were expecting?
|
|
log(1, ntohl(addr->sin_addr.s_addr), 0, t, " Out of sequence tunnel %d, (%d is not the expected %d)\n", t, ns, tunnel[t].nr);
|
|
STAT(tunnel_rx_errors);
|
|
|
|
if (l) // Is this not a ZLB?
|
|
controlnull(t);
|
|
return;
|
|
}
|
|
// receiver advance (do here so quoted correctly in any sends below)
|
|
if (l) tunnel[t].nr = (ns + 1);
|
|
if (skip < 0) skip = 0;
|
|
if (skip < tunnel[t].controlc)
|
|
{
|
|
// some control packets can now be sent that were previous stuck out of window
|
|
int tosend = tunnel[t].window - skip;
|
|
controlt *c = tunnel[t].controls;
|
|
while (c && skip)
|
|
{
|
|
c = c->next;
|
|
skip--;
|
|
}
|
|
while (c && tosend)
|
|
{
|
|
tunnel[t].try = 0; // first send
|
|
tunnelsend(c->buf, c->length, t);
|
|
c = c->next;
|
|
tosend--;
|
|
}
|
|
}
|
|
if (!tunnel[t].controlc)
|
|
tunnel[t].retry = 0; // caught up
|
|
}
|
|
if (l)
|
|
{ // if not a null message
|
|
// process AVPs
|
|
while (l && !(fatal & 0x80))
|
|
{
|
|
u16 n = (ntohs(*(u16 *) p) & 0x3FF);
|
|
u8 *b = p;
|
|
u8 flags = *p;
|
|
u16 mtype;
|
|
p += n; // next
|
|
if (l < n)
|
|
{
|
|
log(1, ntohl(addr->sin_addr.s_addr), s, t, "Invalid length in AVP\n");
|
|
STAT(tunnel_rx_errors);
|
|
fatal = flags;
|
|
return;
|
|
}
|
|
l -= n;
|
|
if (flags & 0x40)
|
|
{
|
|
// handle hidden AVPs
|
|
if (!*config->l2tpsecret)
|
|
{
|
|
log(1, ntohl(addr->sin_addr.s_addr), s, t, "Hidden AVP requested, but no L2TP secret.\n");
|
|
fatal = flags;
|
|
continue;
|
|
}
|
|
if (!session[s].random_vector_length)
|
|
{
|
|
log(1, ntohl(addr->sin_addr.s_addr), s, t, "Hidden AVP requested, but no random vector.\n");
|
|
fatal = flags;
|
|
continue;
|
|
}
|
|
log(4, ntohl(addr->sin_addr.s_addr), s, t, "Hidden AVP\n");
|
|
}
|
|
if (*b & 0x3C)
|
|
{
|
|
log(1, ntohl(addr->sin_addr.s_addr), s, t, "Unrecognised AVP flags %02X\n", *b);
|
|
fatal = flags;
|
|
continue; // next
|
|
}
|
|
b += 2;
|
|
if (*(u16 *) (b))
|
|
{
|
|
log(2, ntohl(addr->sin_addr.s_addr), s, t, "Unknown AVP vendor %d\n", ntohs(*(u16 *) (b)));
|
|
fatal = flags;
|
|
continue; // next
|
|
}
|
|
b += 2;
|
|
mtype = ntohs(*(u16 *) (b));
|
|
b += 2;
|
|
n -= 6;
|
|
|
|
log(4, ntohl(addr->sin_addr.s_addr), s, t, " AVP %d (%s) len %d\n", mtype, avpnames[mtype], n);
|
|
switch (mtype)
|
|
{
|
|
case 0: // message type
|
|
message = ntohs(*(u16 *) b);
|
|
log(4, ntohl(addr->sin_addr.s_addr), s, t, " Message type = %d (%s)\n", *b,
|
|
l2tp_message_types[message]);
|
|
mandatorymessage = flags;
|
|
break;
|
|
case 1: // result code
|
|
{
|
|
u16 rescode = ntohs(*(u16 *)(b));
|
|
const char* resdesc = "(unknown)";
|
|
if (message == 4)
|
|
{ /* StopCCN */
|
|
if (rescode <= MAX_STOPCCN_RESULT_CODE)
|
|
resdesc = stopccn_result_codes[rescode];
|
|
}
|
|
else if (message == 14)
|
|
{ /* CDN */
|
|
if (rescode <= MAX_CDN_RESULT_CODE)
|
|
resdesc = cdn_result_codes[rescode];
|
|
}
|
|
|
|
log(4, ntohl(addr->sin_addr.s_addr), s, t, " Result Code %d: %s\n",
|
|
rescode, resdesc);
|
|
if (n >= 4)
|
|
{
|
|
u16 errcode = ntohs(*(u16 *)(b + 2));
|
|
const char* errdesc = "(unknown)";
|
|
if (errcode <= MAX_ERROR_CODE)
|
|
errdesc = error_codes[errcode];
|
|
log(4, ntohl(addr->sin_addr.s_addr), s, t, " Error Code %d: %s\n",
|
|
errcode, errdesc);
|
|
}
|
|
if (n > 4)
|
|
log(4, ntohl(addr->sin_addr.s_addr), s, t, " Error String: %.*s\n",
|
|
n-4, b+4);
|
|
|
|
break;
|
|
}
|
|
break;
|
|
case 2: // protocol version
|
|
{
|
|
version = ntohs(*(u16 *) (b));
|
|
log(4, ntohl(addr->sin_addr.s_addr), s, t, " Protocol version = %d\n", version);
|
|
if (version && version != 0x0100)
|
|
{ // allow 0.0 and 1.0
|
|
log(1, ntohl(addr->sin_addr.s_addr), s, t, " Bad protocol version %04X\n",
|
|
version);
|
|
fatal = flags;
|
|
continue; // next
|
|
}
|
|
}
|
|
break;
|
|
case 3: // framing capabilities
|
|
// log(4, ntohl(addr->sin_addr.s_addr), s, t, "Framing capabilities\n");
|
|
break;
|
|
case 4: // bearer capabilities
|
|
// log(4, ntohl(addr->sin_addr.s_addr), s, t, "Bearer capabilities\n");
|
|
break;
|
|
case 5: // tie breaker
|
|
// We never open tunnels, so we don't care about tie breakers
|
|
// log(4, ntohl(addr->sin_addr.s_addr), s, t, "Tie breaker\n");
|
|
continue;
|
|
case 6: // firmware revision
|
|
// log(4, ntohl(addr->sin_addr.s_addr), s, t, "Firmware revision\n");
|
|
break;
|
|
case 7: // host name
|
|
memset(tunnel[t].hostname, 0, 128);
|
|
memcpy(tunnel[t].hostname, b, (n >= 127) ? 127 : n);
|
|
log(4, ntohl(addr->sin_addr.s_addr), s, t, " Tunnel hostname = \"%s\"\n", tunnel[t].hostname);
|
|
// TBA - to send to RADIUS
|
|
break;
|
|
case 8: // vendor name
|
|
memset(tunnel[t].vendor, 0, sizeof(tunnel[t].vendor));
|
|
memcpy(tunnel[t].vendor, b, (n >= sizeof(tunnel[t].vendor) - 1) ? sizeof(tunnel[t].vendor) - 1 : n);
|
|
log(4, ntohl(addr->sin_addr.s_addr), s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor);
|
|
break;
|
|
case 9: // assigned tunnel
|
|
tunnel[t].far = ntohs(*(u16 *) (b));
|
|
log(4, ntohl(addr->sin_addr.s_addr), s, t, " Remote tunnel id = %d\n", tunnel[t].far);
|
|
break;
|
|
case 10: // rx window
|
|
tunnel[t].window = ntohs(*(u16 *) (b));
|
|
if (!tunnel[t].window)
|
|
tunnel[t].window = 1; // window of 0 is silly
|
|
log(4, ntohl(addr->sin_addr.s_addr), s, t, " rx window = %d\n", tunnel[t].window);
|
|
break;
|
|
case 11: // Challenge
|
|
{
|
|
log(4, ntohl(addr->sin_addr.s_addr), s, t, " LAC requested CHAP authentication for tunnel\n");
|
|
build_chap_response(b, 2, n, &chapresponse);
|
|
}
|
|
break;
|
|
case 14: // assigned session
|
|
asession = session[s].far = ntohs(*(u16 *) (b));
|
|
log(4, ntohl(addr->sin_addr.s_addr), s, t, " assigned session = %d\n", asession);
|
|
break;
|
|
case 15: // call serial number
|
|
log(4, ntohl(addr->sin_addr.s_addr), s, t, " call serial number = %d\n", ntohl(*(u32 *)b));
|
|
break;
|
|
case 18: // bearer type
|
|
log(4, ntohl(addr->sin_addr.s_addr), s, t, " bearer type = %d\n", ntohl(*(u32 *)b));
|
|
// TBA - for RADIUS
|
|
break;
|
|
case 19: // framing type
|
|
log(4, ntohl(addr->sin_addr.s_addr), s, t, " framing type = %d\n", ntohl(*(u32 *)b));
|
|
// TBA
|
|
break;
|
|
case 21: // called number
|
|
memset(called, 0, MAXTEL);
|
|
memcpy(called, b, (n >= MAXTEL) ? (MAXTEL-1) : n);
|
|
log(4, ntohl(addr->sin_addr.s_addr), s, t, " Called <%s>\n", called);
|
|
break;
|
|
case 22: // calling number
|
|
memset(calling, 0, MAXTEL);
|
|
memcpy(calling, b, (n >= MAXTEL) ? (MAXTEL-1) : n);
|
|
log(4, ntohl(addr->sin_addr.s_addr), s, t, " Calling <%s>\n", calling);
|
|
break;
|
|
case 23: // subtype
|
|
break;
|
|
case 24: // tx connect speed
|
|
if (n == 4)
|
|
{
|
|
session[s].tx_connect_speed = ntohl(*(u32 *)b);
|
|
}
|
|
else
|
|
{
|
|
// AS5300s send connect speed as a string
|
|
char tmp[30] = {0};
|
|
memcpy(tmp, b, (n >= 30) ? 30 : n);
|
|
session[s].tx_connect_speed = atol(tmp);
|
|
}
|
|
log(4, ntohl(addr->sin_addr.s_addr), s, t, " TX connect speed <%u>\n",
|
|
session[s].tx_connect_speed);
|
|
break;
|
|
case 38: // rx connect speed
|
|
if (n == 4)
|
|
{
|
|
session[s].rx_connect_speed = ntohl(*(u32 *)b);
|
|
}
|
|
else
|
|
{
|
|
// AS5300s send connect speed as a string
|
|
char tmp[30] = {0};
|
|
memcpy(tmp, b, (n >= 30) ? 30 : n);
|
|
session[s].rx_connect_speed = atol(tmp);
|
|
}
|
|
log(4, ntohl(addr->sin_addr.s_addr), s, t, " RX connect speed <%u>\n",
|
|
session[s].rx_connect_speed);
|
|
break;
|
|
case 25: // Physical Channel ID
|
|
{
|
|
u32 tmp = ntohl(*(u32 *)b);
|
|
log(4, ntohl(addr->sin_addr.s_addr), s, t, " Physical Channel ID <%X>\n", tmp);
|
|
break;
|
|
}
|
|
case 29: // Proxy Authentication Type
|
|
{
|
|
u16 authtype = ntohs(*(u16 *)b);
|
|
log(4, ntohl(addr->sin_addr.s_addr), s, t, " Proxy Auth Type %d (%s)\n",
|
|
authtype, authtypes[authtype]);
|
|
requestchap = (authtype == 2);
|
|
break;
|
|
}
|
|
case 30: // Proxy Authentication Name
|
|
{
|
|
char authname[64] = {0};
|
|
memcpy(authname, b, (n > 63) ? 63 : n);
|
|
log(4, ntohl(addr->sin_addr.s_addr), s, t, " Proxy Auth Name (%s)\n",
|
|
authname);
|
|
break;
|
|
}
|
|
case 31: // Proxy Authentication Challenge
|
|
{
|
|
memcpy(radius[session[s].radius].auth, b, 16);
|
|
log(4, ntohl(addr->sin_addr.s_addr), s, t, " Proxy Auth Challenge\n");
|
|
break;
|
|
}
|
|
case 32: // Proxy Authentication ID
|
|
{
|
|
u16 authid = ntohs(*(u16 *)(b));
|
|
log(4, ntohl(addr->sin_addr.s_addr), s, t, " Proxy Auth ID (%d)\n",
|
|
authid);
|
|
if (session[s].radius)
|
|
radius[session[s].radius].id = authid;
|
|
break;
|
|
}
|
|
case 33: // Proxy Authentication Response
|
|
{
|
|
char authresp[64] = {0};
|
|
memcpy(authresp, b, (n > 63) ? 63 : n);
|
|
log(4, ntohl(addr->sin_addr.s_addr), s, t, " Proxy Auth Response\n");
|
|
break;
|
|
}
|
|
case 27: // last send lcp
|
|
{ // find magic number
|
|
u8 *p = b, *e = p + n;
|
|
while (p < e && p[1])
|
|
{
|
|
if (*p == 5 && p[1] == 6)
|
|
amagic = ntohl(*(u32 *) (p + 2));
|
|
else if (*p == 3 && p[1] == 5 && *(u16 *) (p + 2) == htons(PPPCHAP) && p[4] == 5)
|
|
chap = 1;
|
|
else if (*p == 7)
|
|
aflags |= SESSIONPFC;
|
|
else if (*p == 8)
|
|
aflags |= SESSIONACFC;
|
|
p += p[1];
|
|
}
|
|
|
|
{
|
|
char tmp[500] = {0};
|
|
tmp[0] = ConfigReq;
|
|
memcpy((tmp + 1), b, n);
|
|
}
|
|
}
|
|
break;
|
|
case 28: // last recv lcp confreq
|
|
{
|
|
char tmp[500] = {0};
|
|
tmp[0] = ConfigReq;
|
|
memcpy((tmp + 1), b, n);
|
|
break;
|
|
}
|
|
case 26: // Initial Received LCP CONFREQ
|
|
{
|
|
char tmp[500] = {0};
|
|
tmp[0] = ConfigReq;
|
|
memcpy((tmp + 1), b, n);
|
|
}
|
|
break;
|
|
case 39: // seq required - we control it as an LNS anyway...
|
|
break;
|
|
case 36: // Random Vector
|
|
log(4, ntohl(addr->sin_addr.s_addr), s, t, " Random Vector received. Enabled AVP Hiding.\n");
|
|
memset(session[s].random_vector, 0, sizeof(session[s].random_vector));
|
|
memcpy(session[s].random_vector, b, n);
|
|
session[s].random_vector_length = n;
|
|
break;
|
|
default:
|
|
log(2, ntohl(addr->sin_addr.s_addr), s, t, " Unknown AVP type %d\n", mtype);
|
|
fatal = flags;
|
|
continue; // next
|
|
}
|
|
}
|
|
// process message
|
|
if (fatal & 0x80)
|
|
tunnelshutdown(t, "Unknown Mandatory AVP");
|
|
else
|
|
switch (message)
|
|
{
|
|
case 1: // SCCRQ - Start Control Connection Request
|
|
{
|
|
controlt *c = controlnew(2); // sending SCCRP
|
|
control16(c, 2, version, 1); // protocol version
|
|
control32(c, 3, 3, 1); // framing
|
|
controls(c, 7, tunnel[t].hostname, 1); // host name (TBA)
|
|
if (chapresponse) controlb(c, 13, chapresponse, 16, 1); // Challenge response
|
|
control16(c, 9, t, 1); // assigned tunnel
|
|
controladd(c, t, s); // send the resply
|
|
}
|
|
tunnel[t].state = TUNNELOPENING;
|
|
break;
|
|
case 2: // SCCRP
|
|
tunnel[t].state = TUNNELOPEN;
|
|
break;
|
|
case 3: // SCCN
|
|
tunnel[t].state = TUNNELOPEN;
|
|
controlnull(t); // ack
|
|
break;
|
|
case 4: // StopCCN
|
|
controlnull(t); // ack
|
|
tunnelshutdown(t, "Stopped"); // Shut down cleanly
|
|
tunnelkill(t, "Stopped"); // Immediately force everything dead
|
|
break;
|
|
case 6: // HELLO
|
|
controlnull(t); // simply ACK
|
|
break;
|
|
case 7: // OCRQ
|
|
// TBA
|
|
break;
|
|
case 8: // OCRO
|
|
// TBA
|
|
break;
|
|
case 9: // OCCN
|
|
// TBA
|
|
break;
|
|
case 10: // ICRQ
|
|
if (!sessionfree)
|
|
{
|
|
STAT(session_overflow);
|
|
tunnelshutdown(t, "No free sessions");
|
|
}
|
|
else
|
|
{
|
|
u16 r;
|
|
controlt *c;
|
|
|
|
s = sessionfree;
|
|
sessionfree = session[s].next;
|
|
memset(&session[s], 0, sizeof(session[s]));
|
|
|
|
if (s > config->cluster_highest_sessionid)
|
|
config->cluster_highest_sessionid = s;
|
|
|
|
// make a RADIUS session
|
|
if (!(r = radiusnew(s)))
|
|
{
|
|
log(1, ntohl(addr->sin_addr.s_addr), s, t, "No free RADIUS sessions for ICRQ\n");
|
|
sessionkill(s, "no free RADIUS sesions");
|
|
return;
|
|
}
|
|
|
|
c = controlnew(11); // sending ICRP
|
|
session[s].id = sessionid++;
|
|
session[s].opened = time(NULL);
|
|
session[s].tunnel = t;
|
|
session[s].far = asession;
|
|
session[s].last_packet = time_now;
|
|
log(3, ntohl(addr->sin_addr.s_addr), s, t, "New session (%d/%d)\n", tunnel[t].far, session[s].far);
|
|
control16(c, 14, s, 1); // assigned session
|
|
controladd(c, t, s); // send the reply
|
|
{
|
|
// Generate a random challenge
|
|
int n;
|
|
for (n = 0; n < 15; n++)
|
|
radius[r].auth[n] = rand();
|
|
}
|
|
strncpy(radius[r].calling, calling, sizeof(radius[r].calling) - 1);
|
|
strncpy(session[s].called, called, sizeof(session[s].called) - 1);
|
|
strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1);
|
|
STAT(session_created);
|
|
}
|
|
break;
|
|
case 11: // ICRP
|
|
// TBA
|
|
break;
|
|
case 12: // ICCN
|
|
if ( amagic == 0) amagic = time_now;
|
|
session[s].magic = amagic; // set magic number
|
|
session[s].l2tp_flags = aflags; // set flags received
|
|
log(3, ntohl(addr->sin_addr.s_addr), s, t, "Magic %X Flags %X\n", amagic, aflags);
|
|
controlnull(t); // ack
|
|
// In CHAP state, request PAP instead
|
|
if (requestchap)
|
|
initlcp(t, s);
|
|
break;
|
|
case 14: // CDN
|
|
controlnull(t); // ack
|
|
sessionshutdown(s, "Closed (Received CDN)");
|
|
break;
|
|
case 0xFFFF:
|
|
log(1, ntohl(addr->sin_addr.s_addr), s, t, "Missing message type\n");
|
|
break;
|
|
default:
|
|
STAT(tunnel_rx_errors);
|
|
if (mandatorymessage & 0x80)
|
|
tunnelshutdown(t, "Unknown message");
|
|
else
|
|
log(1, ntohl(addr->sin_addr.s_addr), s, t, "Unknown message type %d\n", message);
|
|
break;
|
|
}
|
|
if (chapresponse) free(chapresponse);
|
|
cluster_send_tunnel(t);
|
|
}
|
|
else
|
|
{
|
|
log(4, 0, s, t, " Got a ZLB ack\n");
|
|
}
|
|
}
|
|
else
|
|
{ // data
|
|
u16 prot;
|
|
|
|
log_hex(5, "Receive Tunnel Data", p, l);
|
|
if (l > 2 && p[0] == 0xFF && p[1] == 0x03)
|
|
{ // HDLC address header, discard
|
|
p += 2;
|
|
l -= 2;
|
|
}
|
|
if (l < 2)
|
|
{
|
|
log(1, ntohl(addr->sin_addr.s_addr), s, t, "Short ppp length %d\n", l);
|
|
STAT(tunnel_rx_errors);
|
|
return;
|
|
}
|
|
if (*p & 1)
|
|
{
|
|
prot = *p++;
|
|
l--;
|
|
}
|
|
else
|
|
{
|
|
prot = ntohs(*(u16 *) p);
|
|
p += 2;
|
|
l -= 2;
|
|
}
|
|
|
|
if (s && !session[s].tunnel) // Is something wrong??
|
|
{
|
|
if (!config->cluster_iam_master)
|
|
{
|
|
// Pass it off to the master to deal with..
|
|
master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
|
|
return;
|
|
}
|
|
|
|
|
|
log(1, ntohl(addr->sin_addr.s_addr), s, t, "UDP packet contains session %d "
|
|
"but no session[%d].tunnel exists (LAC said"
|
|
" tunnel = %d). Dropping packet.\n", s, s, t);
|
|
STAT(tunnel_rx_errors);
|
|
return;
|
|
}
|
|
|
|
if (session[s].die)
|
|
{
|
|
log(3, ntohl(addr->sin_addr.s_addr), s, t, "Session %d is closing. Don't process PPP packets\n", s);
|
|
// I'm pretty sure this isn't right -- mo.
|
|
// return; // closing session, PPP not processed
|
|
}
|
|
if (prot == PPPPAP)
|
|
{
|
|
session[s].last_packet = time_now;
|
|
if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
|
|
processpap(t, s, p, l);
|
|
}
|
|
else if (prot == PPPCHAP)
|
|
{
|
|
session[s].last_packet = time_now;
|
|
if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
|
|
processchap(t, s, p, l);
|
|
}
|
|
else if (prot == PPPLCP)
|
|
{
|
|
session[s].last_packet = time_now;
|
|
if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
|
|
processlcp(t, s, p, l);
|
|
}
|
|
else if (prot == PPPIPCP)
|
|
{
|
|
session[s].last_packet = time_now;
|
|
if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
|
|
processipcp(t, s, p, l);
|
|
}
|
|
else if (prot == PPPCCP)
|
|
{
|
|
session[s].last_packet = time_now;
|
|
if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
|
|
processccp(t, s, p, l);
|
|
}
|
|
else if (prot == PPPIP)
|
|
{
|
|
if (!config->cluster_iam_master)
|
|
{
|
|
// We're a slave. Should we forward this packet to the master?
|
|
|
|
// Is this a walled garden session, or something that needs it's
|
|
// idle time updated??
|
|
|
|
// Maintain the idle timeouts on the master. If this would
|
|
// significantly reset the idletimeout, run it via the master
|
|
// to refresh the master's idle timer.
|
|
// Not sure this is ideal: It may re-order packets.
|
|
|
|
if (session[s].walled_garden || (session[s].last_packet + (ECHO_TIMEOUT/2)) < time_now)
|
|
{
|
|
master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
|
|
session[s].last_packet = time_now;
|
|
return;
|
|
}
|
|
// fall through to processipin.
|
|
} else
|
|
session[s].last_packet = time_now;
|
|
processipin(t, s, p, l);
|
|
}
|
|
else
|
|
{
|
|
STAT(tunnel_rx_errors);
|
|
log(1, ntohl(addr->sin_addr.s_addr), s, t, "Unknown PPP protocol %04X\n", prot);
|
|
}
|
|
}
|
|
}
|
|
|
|
// read and process packet on tun
|
|
void processtun(u8 * buf, int len)
|
|
{
|
|
log_hex(5, "Receive TUN Data", buf, len);
|
|
STAT(tun_rx_packets);
|
|
INC_STAT(tun_rx_bytes, len);
|
|
|
|
CSTAT(call_processtun);
|
|
|
|
eth_rx_pkt++;
|
|
eth_rx += len;
|
|
if (len < 22)
|
|
{
|
|
log(1, 0, 0, 0, "Short tun packet %d bytes\n", len);
|
|
STAT(tun_rx_errors);
|
|
return;
|
|
}
|
|
|
|
if (*(u16 *) (buf + 2) == htons(PKTIP)) // IP
|
|
processipout(buf, len);
|
|
// Else discard.
|
|
}
|
|
|
|
//
|
|
// Maximum number of actions to complete.
|
|
// This is to avoid sending out too many packets
|
|
// at once.
|
|
#define MAX_ACTIONS 500
|
|
|
|
int regular_cleanups(void)
|
|
{
|
|
static sessionidt s = 0; // Next session to check for actions on.
|
|
tunnelidt t;
|
|
int count=0,i;
|
|
u16 r;
|
|
static clockt next_acct = 0;
|
|
int a;
|
|
|
|
log(3, 0, 0, 0, "Begin regular cleanup\n");
|
|
|
|
for (r = 1; r < MAXRADIUS; r++)
|
|
{
|
|
if (!radius[r].state)
|
|
continue;
|
|
if (radius[r].retry)
|
|
{
|
|
if (radius[r].retry <= TIME)
|
|
radiusretry(r);
|
|
} else
|
|
radius[r].retry = backoff(radius[r].try+1); // Is this really needed? --mo
|
|
}
|
|
for (t = 1; t <= config->cluster_highest_tunnelid; t++)
|
|
{
|
|
// check for expired tunnels
|
|
if (tunnel[t].die && tunnel[t].die <= TIME)
|
|
{
|
|
STAT(tunnel_timeout);
|
|
tunnelkill(t, "Expired");
|
|
continue;
|
|
}
|
|
// check for message resend
|
|
if (tunnel[t].retry && tunnel[t].controlc)
|
|
{
|
|
// resend pending messages as timeout on reply
|
|
if (tunnel[t].retry <= TIME)
|
|
{
|
|
controlt *c = tunnel[t].controls;
|
|
u8 w = tunnel[t].window;
|
|
tunnel[t].try++; // another try
|
|
if (tunnel[t].try > 5)
|
|
tunnelkill(t, "Timeout on control message"); // game over
|
|
else
|
|
while (c && w--)
|
|
{
|
|
tunnelsend(c->buf, c->length, t);
|
|
c = c->next;
|
|
}
|
|
}
|
|
}
|
|
// Send hello
|
|
if (tunnel[t].state == TUNNELOPEN && tunnel[t].lastrec < TIME + 600)
|
|
{
|
|
controlt *c = controlnew(6); // sending HELLO
|
|
controladd(c, t, 0); // send the message
|
|
log(3, tunnel[t].ip, 0, t, "Sending HELLO message\n");
|
|
}
|
|
|
|
// Check for tunnel changes requested from the CLI
|
|
if ((a = cli_tunnel_actions[t].action))
|
|
{
|
|
cli_tunnel_actions[t].action = 0;
|
|
if (a & CLI_TUN_KILL)
|
|
{
|
|
log(2, tunnel[t].ip, 0, t, "Dropping tunnel by CLI\n");
|
|
tunnelshutdown(t, "Requested by administrator");
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
count = 0;
|
|
for (i = 1; i <= config->cluster_highest_sessionid; i++)
|
|
{
|
|
s++;
|
|
if (s > config->cluster_highest_sessionid)
|
|
s = 1;
|
|
|
|
if (!session[s].tunnel) // Session isn't in use
|
|
continue;
|
|
|
|
if (!session[s].die && session[s].ip && !(session[s].flags & SF_IPCP_ACKED))
|
|
{
|
|
// IPCP has not completed yet. Resend
|
|
log(3, session[s].ip, s, session[s].tunnel, "No ACK for initial IPCP ConfigReq... resending\n");
|
|
sendipcp(session[s].tunnel, s);
|
|
}
|
|
|
|
// check for expired sessions
|
|
if (session[s].die && session[s].die <= TIME)
|
|
{
|
|
sessionkill(s, "Expired");
|
|
if (++count >= MAX_ACTIONS) break;
|
|
continue;
|
|
}
|
|
|
|
// Drop sessions who have not responded within IDLE_TIMEOUT seconds
|
|
if (session[s].last_packet && (time_now - session[s].last_packet >= IDLE_TIMEOUT))
|
|
{
|
|
sessionkill(s, "No response to LCP ECHO requests");
|
|
STAT(session_timeout);
|
|
if (++count >= MAX_ACTIONS) break;
|
|
continue;
|
|
}
|
|
|
|
// No data in IDLE_TIMEOUT seconds, send LCP ECHO
|
|
if (session[s].user[0] && (time_now - session[s].last_packet >= ECHO_TIMEOUT))
|
|
{
|
|
u8 b[MAXCONTROL] = {0};
|
|
|
|
u8 *q = makeppp(b, sizeof(b), 0, 0, session[s].tunnel, s, PPPLCP);
|
|
if (!q)
|
|
{
|
|
log(3, session[s].ip, s, t, "failed to send ECHO packet.\n");
|
|
continue;
|
|
}
|
|
|
|
*q = EchoReq;
|
|
*(u8 *)(q + 1) = (time_now % 255); // ID
|
|
*(u16 *)(q + 2) = htons(8); // Length
|
|
*(u32 *)(q + 4) = 0; // Magic Number (not supported)
|
|
|
|
log(4, session[s].ip, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n",
|
|
(int)(time_now - session[s].last_packet));
|
|
tunnelsend(b, 24, session[s].tunnel); // send it
|
|
if (++count >= MAX_ACTIONS) break;
|
|
}
|
|
|
|
// Check for actions requested from the CLI
|
|
if ((a = cli_session_actions[s].action))
|
|
{
|
|
int send = 0;
|
|
|
|
cli_session_actions[s].action = 0;
|
|
if (a & CLI_SESS_KILL)
|
|
{
|
|
log(2, 0, s, session[s].tunnel, "Dropping session by CLI\n");
|
|
sessionshutdown(s, "Requested by administrator");
|
|
a = 0; // dead, no need to check for other actions
|
|
}
|
|
|
|
if (a & CLI_SESS_SNOOP)
|
|
{
|
|
log(2, 0, s, session[s].tunnel, "Snooping session by CLI (to %s:%d)\n",
|
|
inet_toa(cli_session_actions[s].snoop_ip), cli_session_actions[s].snoop_port);
|
|
|
|
session[s].snoop_ip = cli_session_actions[s].snoop_ip;
|
|
session[s].snoop_port = cli_session_actions[s].snoop_port;
|
|
send++;
|
|
}
|
|
|
|
if (a & CLI_SESS_NOSNOOP)
|
|
{
|
|
log(2, 0, s, session[s].tunnel, "Unsnooping session by CLI\n");
|
|
session[s].snoop_ip = 0;
|
|
session[s].snoop_port = 0;
|
|
send++;
|
|
}
|
|
|
|
if (a & CLI_SESS_THROTTLE)
|
|
{
|
|
log(2, 0, s, session[s].tunnel, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
|
|
cli_session_actions[s].throttle & 0xFFFF,
|
|
cli_session_actions[s].throttle >> 16);
|
|
|
|
throttle_session(s, cli_session_actions[s].throttle);
|
|
}
|
|
|
|
if (a & CLI_SESS_NOTHROTTLE)
|
|
{
|
|
log(2, 0, s, session[s].tunnel, "Un-throttling session by CLI\n");
|
|
throttle_session(s, 0);
|
|
}
|
|
|
|
if (send)
|
|
cluster_send_session(s);
|
|
|
|
if (++count >= MAX_ACTIONS) break;
|
|
}
|
|
}
|
|
|
|
if (config->accounting_dir && next_acct <= TIME)
|
|
{
|
|
// Dump accounting data
|
|
next_acct = TIME + ACCT_TIME;
|
|
dump_acct_info();
|
|
}
|
|
|
|
if (count >= MAX_ACTIONS)
|
|
return 1; // Didn't finish!
|
|
|
|
log(3, 0, 0, 0, "End regular cleanup (%d actions), next in %d seconds\n", count, config->cleanup_interval);
|
|
return 0;
|
|
}
|
|
|
|
|
|
//
|
|
// Are we in the middle of a tunnel update, or radius
|
|
// requests??
|
|
//
|
|
int still_busy(void)
|
|
{
|
|
int i;
|
|
static clockt last_talked = 0;
|
|
static clockt start_busy_wait = 0;
|
|
if (start_busy_wait == 0)
|
|
start_busy_wait = TIME;
|
|
|
|
for (i = config->cluster_highest_tunnelid ; i > 0 ; --i)
|
|
{
|
|
if (!tunnel[i].controlc)
|
|
continue;
|
|
|
|
if (last_talked != TIME)
|
|
{
|
|
log(2,0,0,0, "Tunnel %d still has un-acked control messages.\n", i);
|
|
last_talked = TIME;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
// We stop waiting for radius after BUSY_WAIT_TIMEOUT 1/10th seconds
|
|
if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIMEOUT)
|
|
{
|
|
log(1, 0, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
|
|
return 0;
|
|
}
|
|
|
|
for (i = 1; i < MAXRADIUS; i++)
|
|
{
|
|
if (radius[i].state == RADIUSNULL)
|
|
continue;
|
|
if (radius[i].state == RADIUSWAIT)
|
|
continue;
|
|
|
|
if (last_talked != TIME)
|
|
{
|
|
log(2,0,0,0, "Radius session %d is still busy (sid %d)\n", i, radius[i].session);
|
|
last_talked = TIME;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
// main loop - gets packets on tun or udp and processes them
|
|
void mainloop(void)
|
|
{
|
|
fd_set cr;
|
|
int cn, i;
|
|
u8 buf[65536];
|
|
struct timeval to;
|
|
clockt next_cluster_ping = 0; // send initial ping immediately
|
|
time_t next_clean = time_now + config->cleanup_interval;
|
|
|
|
log(4, 0, 0, 0, "Beginning of main loop. udpfd=%d, tunfd=%d, cluster_sockfd=%d, controlfd=%d\n",
|
|
udpfd, tunfd, cluster_sockfd, controlfd);
|
|
|
|
FD_ZERO(&cr);
|
|
FD_SET(udpfd, &cr);
|
|
FD_SET(tunfd, &cr);
|
|
FD_SET(controlfd, &cr);
|
|
FD_SET(clifd, &cr);
|
|
if (cluster_sockfd) FD_SET(cluster_sockfd, &cr);
|
|
cn = udpfd;
|
|
if (cn < tunfd) cn = tunfd;
|
|
if (cn < controlfd) cn = controlfd;
|
|
if (cn < clifd) cn = clifd;
|
|
if (cn < cluster_sockfd) cn = cluster_sockfd;
|
|
for (i = 0; i < config->num_radfds; i++)
|
|
{
|
|
if (!radfds[i]) continue;
|
|
FD_SET(radfds[i], &cr);
|
|
if (radfds[i] > cn)
|
|
cn = radfds[i];
|
|
}
|
|
|
|
while (!main_quit || still_busy())
|
|
{
|
|
fd_set r;
|
|
int n = cn;
|
|
#ifdef BGP
|
|
fd_set w;
|
|
int bgp_set[BGP_NUM_PEERS];
|
|
#endif /* BGP */
|
|
|
|
if (config->reload_config)
|
|
{
|
|
// Update the config state based on config settings
|
|
update_config();
|
|
}
|
|
|
|
memcpy(&r, &cr, sizeof(fd_set));
|
|
to.tv_sec = 0;
|
|
to.tv_usec = 100000; // 1/10th of a second.
|
|
|
|
#ifdef BGP
|
|
FD_ZERO(&w);
|
|
for (i = 0; i < BGP_NUM_PEERS; i++)
|
|
{
|
|
bgp_set[i] = bgp_select_state(&bgp_peers[i]);
|
|
if (bgp_set[i] & 1)
|
|
{
|
|
FD_SET(bgp_peers[i].sock, &r);
|
|
if (bgp_peers[i].sock > n)
|
|
n = bgp_peers[i].sock;
|
|
}
|
|
|
|
if (bgp_set[i] & 2)
|
|
{
|
|
FD_SET(bgp_peers[i].sock, &w);
|
|
if (bgp_peers[i].sock > n)
|
|
n = bgp_peers[i].sock;
|
|
}
|
|
}
|
|
|
|
n = select(n + 1, &r, &w, 0, &to);
|
|
#else /* BGP */
|
|
n = select(n + 1, &r, 0, 0, &to);
|
|
#endif /* BGP */
|
|
|
|
TIME = now();
|
|
if (n < 0)
|
|
{
|
|
if (errno == EINTR)
|
|
continue;
|
|
|
|
log(0, 0, 0, 0, "Error returned from select(): %s\n", strerror(errno));
|
|
main_quit++;
|
|
break;
|
|
}
|
|
else if (n)
|
|
{
|
|
struct sockaddr_in addr;
|
|
int alen = sizeof(addr);
|
|
if (FD_ISSET(udpfd, &r))
|
|
{
|
|
int c, n;
|
|
for (c = 0; c < config->multi_read_count; c++)
|
|
{
|
|
if ((n = recvfrom(udpfd, buf, sizeof(buf), 0, (void *) &addr, &alen)) > 0)
|
|
processudp(buf, n, &addr);
|
|
else
|
|
break;
|
|
}
|
|
}
|
|
if (FD_ISSET(tunfd, &r))
|
|
{
|
|
int c, n;
|
|
for (c = 0; c < config->multi_read_count; c++)
|
|
{
|
|
if ((n = read(tunfd, buf, sizeof(buf))) > 0)
|
|
processtun(buf, n);
|
|
else
|
|
break;
|
|
}
|
|
}
|
|
for (i = 0; i < config->num_radfds; i++)
|
|
if (FD_ISSET(radfds[i], &r))
|
|
processrad(buf, recv(radfds[i], buf, sizeof(buf), 0), i);
|
|
if (FD_ISSET(cluster_sockfd, &r))
|
|
{
|
|
int size;
|
|
size = recvfrom(cluster_sockfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen);
|
|
processcluster(buf, size, addr.sin_addr.s_addr);
|
|
}
|
|
if (FD_ISSET(controlfd, &r))
|
|
processcontrol(buf, recvfrom(controlfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen), &addr);
|
|
if (FD_ISSET(clifd, &r))
|
|
{
|
|
struct sockaddr_in addr;
|
|
int sockfd;
|
|
int len = sizeof(addr);
|
|
|
|
if ((sockfd = accept(clifd, (struct sockaddr *)&addr, &len)) <= 0)
|
|
{
|
|
log(0, 0, 0, 0, "accept error: %s\n", strerror(errno));
|
|
continue;
|
|
}
|
|
else
|
|
{
|
|
cli_do(sockfd);
|
|
close(sockfd);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Runs on every machine (master and slaves).
|
|
if (cluster_sockfd && next_cluster_ping <= TIME)
|
|
{
|
|
// Check to see which of the cluster is still alive..
|
|
|
|
cluster_send_ping(basetime); // Only does anything if we're a slave
|
|
cluster_check_master(); // ditto.
|
|
|
|
cluster_heartbeat(); // Only does anything if we're a master.
|
|
cluster_check_slaves(); // ditto.
|
|
|
|
master_update_counts(); // If we're a slave, send our byte counters to our master.
|
|
|
|
if (config->cluster_iam_master && !config->cluster_iam_uptodate)
|
|
next_cluster_ping = TIME + 1; // out-of-date slaves, do fast updates
|
|
else
|
|
next_cluster_ping = TIME + config->cluster_hb_interval;
|
|
}
|
|
|
|
// Run token bucket filtering queue..
|
|
// Only run it every 1/10th of a second.
|
|
// Runs on all machines both master and slave.
|
|
{
|
|
static clockt last_run = 0;
|
|
if (last_run != TIME)
|
|
{
|
|
last_run = TIME;
|
|
tbf_run_timer();
|
|
}
|
|
}
|
|
|
|
/* Handle timeouts. Make sure that this gets run anyway, even if there was
|
|
* something to read, else under load this will never actually run....
|
|
*
|
|
*/
|
|
if (config->cluster_iam_master && next_clean <= time_now)
|
|
{
|
|
if (regular_cleanups())
|
|
{
|
|
// Did it finish?
|
|
next_clean = time_now + 1 ; // Didn't finish. Check quickly.
|
|
}
|
|
else
|
|
{
|
|
next_clean = time_now + config->cleanup_interval; // Did. Move to next interval.
|
|
}
|
|
}
|
|
|
|
#ifdef BGP
|
|
for (i = 0; i < BGP_NUM_PEERS; i++)
|
|
{
|
|
bgp_process(&bgp_peers[i],
|
|
bgp_set[i] ? FD_ISSET(bgp_peers[i].sock, &r) : 0,
|
|
bgp_set[i] ? FD_ISSET(bgp_peers[i].sock, &w) : 0);
|
|
}
|
|
#endif /* BGP */
|
|
}
|
|
|
|
// Are we the master and shutting down??
|
|
if (config->cluster_iam_master)
|
|
cluster_heartbeat(); // Flush any queued changes..
|
|
|
|
// Ok. Notify everyone we're shutting down. If we're
|
|
// the master, this will force an election.
|
|
cluster_send_ping(0);
|
|
|
|
//
|
|
// Important!!! We MUST not process any packets past this point!
|
|
}
|
|
|
|
// Init data structures
|
|
void initdata(void)
|
|
{
|
|
int i;
|
|
|
|
_statistics = mmap(NULL, sizeof(struct Tstats), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
|
|
if (_statistics == MAP_FAILED)
|
|
{
|
|
log(0, 0, 0, 0, "Error doing mmap for _statistics: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
config = mmap(NULL, sizeof(struct configt), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
|
|
if (config == MAP_FAILED)
|
|
{
|
|
log(0, 0, 0, 0, "Error doing mmap for configuration: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
memset(config, 0, sizeof(struct configt));
|
|
time(&config->start_time);
|
|
strncpy(config->config_file, CONFIGFILE, sizeof(config->config_file) - 1);
|
|
tunnel = mmap(NULL, sizeof(tunnelt) * MAXTUNNEL, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
|
|
if (tunnel == MAP_FAILED)
|
|
{
|
|
log(0, 0, 0, 0, "Error doing mmap for tunnels: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
session = mmap(NULL, sizeof(sessiont) * MAXSESSION, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
|
|
if (session == MAP_FAILED)
|
|
{
|
|
log(0, 0, 0, 0, "Error doing mmap for sessions: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
sess_count = mmap(NULL, sizeof(sessioncountt) * MAXSESSION, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
|
|
if (sess_count == MAP_FAILED)
|
|
{
|
|
log(0, 0, 0, 0, "Error doing mmap for sessions_count: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
radius = mmap(NULL, sizeof(radiust) * MAXRADIUS, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
|
|
if (radius == MAP_FAILED)
|
|
{
|
|
log(0, 0, 0, 0, "Error doing mmap for radius: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
ip_address_pool = mmap(NULL, sizeof(ippoolt) * MAXIPPOOL, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
|
|
if (ip_address_pool == MAP_FAILED)
|
|
{
|
|
log(0, 0, 0, 0, "Error doing mmap for ip_address_pool: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
#ifdef RINGBUFFER
|
|
ringbuffer = mmap(NULL, sizeof(struct Tringbuffer), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
|
|
if (ringbuffer == MAP_FAILED)
|
|
{
|
|
log(0, 0, 0, 0, "Error doing mmap for ringbuffer: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
memset(ringbuffer, 0, sizeof(struct Tringbuffer));
|
|
#endif
|
|
|
|
cli_session_actions = mmap(NULL, sizeof(struct cli_session_actions) * MAXSESSION, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
|
|
if (cli_session_actions == MAP_FAILED)
|
|
{
|
|
log(0, 0, 0, 0, "Error doing mmap for cli session actions: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION);
|
|
cli_tunnel_actions = mmap(NULL, sizeof(struct cli_tunnel_actions) * MAXSESSION, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
|
|
if (cli_tunnel_actions == MAP_FAILED)
|
|
{
|
|
log(0, 0, 0, 0, "Error doing mmap for cli tunnel actions: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);
|
|
|
|
memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL);
|
|
memset(session, 0, sizeof(sessiont) * MAXSESSION);
|
|
memset(radius, 0, sizeof(radiust) * MAXRADIUS);
|
|
memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL);
|
|
|
|
// Put all the sessions on the free list marked as undefined.
|
|
for (i = 1; i < MAXSESSION - 1; i++)
|
|
{
|
|
session[i].next = i + 1;
|
|
session[i].tunnel = T_UNDEF; // mark it as not filled in.
|
|
}
|
|
session[MAXSESSION - 1].next = 0;
|
|
sessionfree = 1;
|
|
|
|
// Mark all the tunnels as undefined (waiting to be filled in by a download).
|
|
for (i = 1; i < MAXTUNNEL- 1; i++)
|
|
tunnel[i].state = TUNNELUNDEF; // mark it as not filled in.
|
|
|
|
if (!*hostname)
|
|
{
|
|
char *p;
|
|
// Grab my hostname unless it's been specified
|
|
gethostname(hostname, sizeof(hostname));
|
|
if ((p = strchr(hostname, '.'))) *p = 0;
|
|
}
|
|
_statistics->start_time = _statistics->last_reset = time(NULL);
|
|
|
|
#ifdef BGP
|
|
bgp_peers = mmap(NULL, sizeof(struct bgp_peer) * BGP_NUM_PEERS, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
|
|
if (bgp_peers == MAP_FAILED)
|
|
{
|
|
log(0, 0, 0, 0, "Error doing mmap for bgp: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
#endif /* BGP */
|
|
}
|
|
|
|
void initiptables(void)
|
|
{
|
|
/* Flush the tables here so that we have a clean slate */
|
|
|
|
// Not needed. 'nat' is setup by garden.c
|
|
// mangle isn't used (as throttling is done by tbf inhouse).
|
|
}
|
|
|
|
int assign_ip_address(sessionidt s)
|
|
{
|
|
u32 i;
|
|
int best = -1;
|
|
time_t best_time = time_now;
|
|
char *u = session[s].user;
|
|
char reuse = 0;
|
|
|
|
|
|
CSTAT(call_assign_ip_address);
|
|
|
|
for (i = 1; i < ip_pool_size; i++)
|
|
{
|
|
if (!ip_address_pool[i].address || ip_address_pool[i].assigned)
|
|
continue;
|
|
|
|
if (!session[s].walled_garden && ip_address_pool[i].user[0] && !strcmp(u, ip_address_pool[i].user))
|
|
{
|
|
best = i;
|
|
reuse = 1;
|
|
break;
|
|
}
|
|
|
|
if (ip_address_pool[i].last < best_time)
|
|
{
|
|
best = i;
|
|
if (!(best_time = ip_address_pool[i].last))
|
|
break; // never used, grab this one
|
|
}
|
|
}
|
|
|
|
if (best < 0)
|
|
{
|
|
log(0, 0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n");
|
|
return 0;
|
|
}
|
|
|
|
session[s].ip = ip_address_pool[best].address;
|
|
session[s].ip_pool_index = best;
|
|
ip_address_pool[best].assigned = 1;
|
|
ip_address_pool[best].last = time_now;
|
|
ip_address_pool[best].session = s;
|
|
if (session[s].walled_garden)
|
|
/* Don't track addresses of users in walled garden (note: this
|
|
means that their address isn't "sticky" even if they get
|
|
un-gardened). */
|
|
ip_address_pool[best].user[0] = 0;
|
|
else
|
|
strncpy(ip_address_pool[best].user, u, sizeof(ip_address_pool[best].user) - 1);
|
|
|
|
STAT(ip_allocated);
|
|
log(4, ip_address_pool[best].address, s, session[s].tunnel,
|
|
"assign_ip_address(): %s ip address %d from pool\n", reuse ? "Reusing" : "Allocating", best);
|
|
|
|
return 1;
|
|
}
|
|
|
|
void free_ip_address(sessionidt s)
|
|
{
|
|
int i = session[s].ip_pool_index;
|
|
|
|
if (!session[s].ip)
|
|
return; // what the?
|
|
|
|
if (i < 0) // Is this actually part of the ip pool?
|
|
i = 0;
|
|
|
|
STAT(ip_freed);
|
|
cache_ipmap(session[s].ip, -i); // Change the mapping to point back to the ip pool index.
|
|
session[s].ip = 0;
|
|
ip_address_pool[i].assigned = 0;
|
|
ip_address_pool[i].session = 0;
|
|
ip_address_pool[i].last = time_now;
|
|
|
|
|
|
CSTAT(call_free_ip_address);
|
|
|
|
}
|
|
|
|
//
|
|
// Fsck the address pool against the session table.
|
|
// Normally only called when we become a master.
|
|
//
|
|
// This isn't perfect: We aren't keep tracking of which
|
|
// users used to have an IP address.
|
|
//
|
|
void rebuild_address_pool(void)
|
|
{
|
|
int i;
|
|
|
|
//
|
|
// Zero the IP pool allocation, and build
|
|
// a map from IP address to pool index.
|
|
for (i = 1; i < MAXIPPOOL; ++i)
|
|
{
|
|
ip_address_pool[i].assigned = 0;
|
|
ip_address_pool[i].session = 0;
|
|
if (!ip_address_pool[i].address)
|
|
continue;
|
|
|
|
cache_ipmap(ip_address_pool[i].address, -i); // Map pool IP to pool index.
|
|
}
|
|
|
|
for (i = 0; i < MAXSESSION; ++i)
|
|
{
|
|
int ipid;
|
|
if (!session[i].ip || !session[i].tunnel)
|
|
continue;
|
|
ipid = - lookup_ipmap(htonl(session[i].ip));
|
|
|
|
if (session[i].ip_pool_index < 0)
|
|
{
|
|
// Not allocated out of the pool.
|
|
if (ipid < 1) // Not found in the pool either? good.
|
|
continue;
|
|
|
|
log(0, 0, i, 0, "Session %d has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
|
|
i, inet_toa(session[i].ip), ipid);
|
|
|
|
// Fall through and process it as part of the pool.
|
|
}
|
|
|
|
|
|
if (ipid > MAXIPPOOL || ipid < 0)
|
|
{
|
|
log(0, 0, i, 0, "Session %d has a pool IP that's not found in the pool! (%d)\n", i, ipid);
|
|
ipid = -1;
|
|
session[i].ip_pool_index = ipid;
|
|
continue;
|
|
}
|
|
|
|
ip_address_pool[ipid].assigned = 1;
|
|
ip_address_pool[ipid].session = i;
|
|
ip_address_pool[ipid].last = time_now;
|
|
strncpy(ip_address_pool[ipid].user, session[i].user, sizeof(ip_address_pool[ipid].user) - 1);
|
|
session[i].ip_pool_index = ipid;
|
|
cache_ipmap(session[i].ip, i); // Fix the ip map.
|
|
}
|
|
}
|
|
|
|
//
|
|
// Fix the address pool to match a changed session.
|
|
// (usually when the master sends us an update).
|
|
void fix_address_pool(int sid)
|
|
{
|
|
int ipid;
|
|
|
|
ipid = session[sid].ip_pool_index;
|
|
|
|
if (ipid > ip_pool_size)
|
|
return; // Ignore it. rebuild_address_pool will fix it up.
|
|
|
|
if (ip_address_pool[ipid].address != session[sid].ip)
|
|
return; // Just ignore it. rebuild_address_pool will take care of it.
|
|
|
|
ip_address_pool[ipid].assigned = 1;
|
|
ip_address_pool[ipid].session = sid;
|
|
ip_address_pool[ipid].last = time_now;
|
|
strncpy(ip_address_pool[ipid].user, session[sid].user, sizeof(ip_address_pool[ipid].user) - 1);
|
|
}
|
|
|
|
//
|
|
// Add a block of addresses to the IP pool to hand out.
|
|
//
|
|
void add_to_ip_pool(u32 addr, u32 mask)
|
|
{
|
|
int i;
|
|
if (mask == 0)
|
|
mask = 0xffffffff; // Host route only.
|
|
|
|
addr &= mask;
|
|
|
|
if (ip_pool_size >= MAXIPPOOL) // Pool is full!
|
|
return ;
|
|
|
|
for (i = addr ;(i & mask) == addr; ++i)
|
|
{
|
|
if ((i & 0xff) == 0 || (i&0xff) == 255)
|
|
continue; // Skip 0 and broadcast addresses.
|
|
|
|
ip_address_pool[ip_pool_size].address = i;
|
|
ip_address_pool[ip_pool_size].assigned = 0;
|
|
++ip_pool_size;
|
|
if (ip_pool_size >= MAXIPPOOL)
|
|
{
|
|
log(0,0,0,0, "Overflowed IP pool adding %s\n", inet_toa(htonl(addr)) );
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Initialize the IP address pool
|
|
void initippool()
|
|
{
|
|
FILE *f;
|
|
char *p;
|
|
char buf[4096];
|
|
memset(ip_address_pool, 0, sizeof(ip_address_pool));
|
|
|
|
if (!(f = fopen(IPPOOLFILE, "r")))
|
|
{
|
|
log(0, 0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
while (ip_pool_size < MAXIPPOOL && fgets(buf, 4096, f))
|
|
{
|
|
char *pool = buf;
|
|
buf[4095] = 0; // Force it to be zero terminated/
|
|
|
|
if (*buf == '#' || *buf == '\n')
|
|
continue; // Skip comments / blank lines
|
|
if ((p = (char *)strrchr(buf, '\n'))) *p = 0;
|
|
if ((p = (char *)strchr(buf, ':')))
|
|
{
|
|
ipt src;
|
|
*p = '\0';
|
|
src = inet_addr(buf);
|
|
if (src == INADDR_NONE)
|
|
{
|
|
log(0, 0, 0, 0, "Invalid address pool IP %s\n", buf);
|
|
exit(1);
|
|
}
|
|
// This entry is for a specific IP only
|
|
if (src != config->bind_address)
|
|
continue;
|
|
*p = ':';
|
|
pool = p+1;
|
|
}
|
|
if ((p = (char *)strchr(pool, '/')))
|
|
{
|
|
// It's a range
|
|
int numbits = 0;
|
|
u32 start = 0, mask = 0;
|
|
|
|
log(2, 0, 0, 0, "Adding IP address range %s\n", buf);
|
|
*p++ = 0;
|
|
if (!*p || !(numbits = atoi(p)))
|
|
{
|
|
log(0, 0, 0, 0, "Invalid pool range %s\n", buf);
|
|
continue;
|
|
}
|
|
start = ntohl(inet_addr(pool));
|
|
mask = (u32)(pow(2, numbits) - 1) << (32 - numbits);
|
|
|
|
// Add a static route for this pool
|
|
log(5, 0, 0, 0, "Adding route for address pool %s/%u\n", inet_toa(htonl(start)), 32 + mask);
|
|
routeset(0, start, mask, 0, 1);
|
|
|
|
add_to_ip_pool(start, mask);
|
|
}
|
|
else
|
|
{
|
|
// It's a single ip address
|
|
add_to_ip_pool(inet_addr(pool), 0);
|
|
}
|
|
}
|
|
fclose(f);
|
|
log(1, 0, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1);
|
|
}
|
|
|
|
void snoop_send_packet(char *packet, u16 size, ipt destination, u16 port)
|
|
{
|
|
struct sockaddr_in snoop_addr = {0};
|
|
if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet)
|
|
return;
|
|
|
|
snoop_addr.sin_family = AF_INET;
|
|
snoop_addr.sin_addr.s_addr = destination;
|
|
snoop_addr.sin_port = ntohs(port);
|
|
|
|
log(5, 0, 0, 0, "Snooping packet at %p (%d bytes) to %s:%d\n",
|
|
packet, size, inet_toa(snoop_addr.sin_addr.s_addr), htons(snoop_addr.sin_port));
|
|
if (sendto(snoopfd, packet, size, MSG_DONTWAIT | MSG_NOSIGNAL, (void *) &snoop_addr, sizeof(snoop_addr)) < 0)
|
|
log(0, 0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno));
|
|
STAT(packets_snooped);
|
|
}
|
|
|
|
void dump_acct_info()
|
|
{
|
|
char filename[1024];
|
|
char timestr[64];
|
|
time_t t = time(NULL);
|
|
int i;
|
|
FILE *f = NULL;
|
|
|
|
|
|
CSTAT(call_dump_acct_info);
|
|
|
|
strftime(timestr, 64, "%Y%m%d%H%M%S", localtime(&t));
|
|
snprintf(filename, 1024, "%s/%s", config->accounting_dir, timestr);
|
|
|
|
for (i = 0; i < MAXSESSION; i++)
|
|
{
|
|
if (!session[i].opened || !session[i].ip || !session[i].cin || !session[i].cout || !*session[i].user || session[i].walled_garden)
|
|
continue;
|
|
if (!f)
|
|
{
|
|
time_t now = time(NULL);
|
|
if (!(f = fopen(filename, "w")))
|
|
{
|
|
log(0, 0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno));
|
|
return ;
|
|
}
|
|
log(3, 0, 0, 0, "Dumping accounting information to %s\n", filename);
|
|
fprintf(f, "# dslwatch.pl dump file V1.01\n"
|
|
"# host: %s\n"
|
|
"# time: %ld\n"
|
|
"# uptime: %ld\n"
|
|
"# format: username ip qos uptxoctets downrxoctets\n",
|
|
hostname,
|
|
now,
|
|
now - basetime);
|
|
}
|
|
|
|
log(4, 0, 0, 0, "Dumping accounting information for %s\n", session[i].user);
|
|
fprintf(f, "%s %s %d %u %u\n",
|
|
session[i].user, // username
|
|
inet_toa(htonl(session[i].ip)), // ip
|
|
(session[i].throttle) ? 2 : 1, // qos
|
|
(u32)session[i].cin, // uptxoctets
|
|
(u32)session[i].cout); // downrxoctets
|
|
|
|
session[i].pin = session[i].cin = 0;
|
|
session[i].pout = session[i].cout = 0;
|
|
}
|
|
|
|
if (f)
|
|
fclose(f);
|
|
}
|
|
|
|
// Main program
|
|
int main(int argc, char *argv[])
|
|
{
|
|
int o;
|
|
int optdebug = 0;
|
|
|
|
_program_name = strdup(argv[0]);
|
|
|
|
time(&basetime); // start clock
|
|
|
|
// scan args
|
|
while ((o = getopt(argc, argv, "vc:h:a:")) >= 0)
|
|
{
|
|
switch (o)
|
|
{
|
|
case 'd':
|
|
// Double fork to detach from terminal
|
|
if (fork()) exit(0);
|
|
if (fork()) exit(0);
|
|
break;
|
|
case 'v':
|
|
optdebug++;
|
|
break;
|
|
case 'h':
|
|
snprintf(hostname, sizeof(hostname), "%s", optarg);
|
|
break;
|
|
case '?':
|
|
default:
|
|
printf("Args are:\n"
|
|
"\t-d\tDetach from terminal\n"
|
|
"\t-c <file>\tConfig file\n"
|
|
"\t-h <hostname>\tForce hostname\n"
|
|
"\t-a <address>\tUse specific address\n"
|
|
"\t-v\t\tDebug\n");
|
|
|
|
return (0);
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Start the timer routine off
|
|
time(&time_now);
|
|
strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
|
|
signal(SIGALRM, sigalrm_handler);
|
|
siginterrupt(SIGALRM, 0);
|
|
|
|
initiptables();
|
|
initplugins();
|
|
initdata();
|
|
|
|
config->debug = optdebug;
|
|
|
|
init_tbf();
|
|
init_cli(hostname);
|
|
read_config_file();
|
|
|
|
log(0, 0, 0, 0, "L2TPNS version " VERSION "\n");
|
|
log(0, 0, 0, 0, "Copyright (c) 2003, 2004 Optus Internet Engineering\n");
|
|
log(0, 0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
|
|
{
|
|
struct rlimit rlim;
|
|
rlim.rlim_cur = RLIM_INFINITY;
|
|
rlim.rlim_max = RLIM_INFINITY;
|
|
// Remove the maximum core size
|
|
if (setrlimit(RLIMIT_CORE, &rlim) < 0)
|
|
log(0, 0, 0, 0, "Can't set ulimit: %s\n", strerror(errno));
|
|
// Make core dumps go to /tmp
|
|
chdir("/tmp");
|
|
}
|
|
|
|
if (config->scheduler_fifo)
|
|
{
|
|
int ret;
|
|
struct sched_param params = {0};
|
|
params.sched_priority = 1;
|
|
|
|
if (get_nprocs() < 2)
|
|
{
|
|
log(0, 0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
|
|
config->scheduler_fifo = 0;
|
|
}
|
|
else
|
|
{
|
|
if ((ret = sched_setscheduler(0, SCHED_FIFO, ¶ms)) == 0)
|
|
{
|
|
log(1, 0, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
|
|
}
|
|
else
|
|
{
|
|
log(0, 0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno));
|
|
config->scheduler_fifo = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Set up the cluster communications port. */
|
|
if (cluster_init(config->bind_address) < 0)
|
|
exit(1);
|
|
|
|
#ifdef BGP
|
|
signal(SIGPIPE, SIG_IGN);
|
|
bgp_setup(config->as_number);
|
|
bgp_add_route(config->bind_address, 0xffffffff);
|
|
if (*config->bgp_peer[0])
|
|
bgp_start(&bgp_peers[0], config->bgp_peer[0],
|
|
config->bgp_peer_as[0], 0); /* 0 = routing disabled */
|
|
|
|
if (*config->bgp_peer[1])
|
|
bgp_start(&bgp_peers[1], config->bgp_peer[1],
|
|
config->bgp_peer_as[1], 0);
|
|
#endif /* BGP */
|
|
|
|
inittun();
|
|
log(1, 0, 0, 0, "Set up on interface %s\n", config->tundevice);
|
|
|
|
initudp();
|
|
initrad();
|
|
initippool();
|
|
|
|
read_state();
|
|
|
|
signal(SIGHUP, sighup_handler);
|
|
signal(SIGTERM, sigterm_handler);
|
|
signal(SIGINT, sigterm_handler);
|
|
signal(SIGQUIT, sigquit_handler);
|
|
signal(SIGCHLD, sigchild_handler);
|
|
|
|
// Prevent us from getting paged out
|
|
if (config->lock_pages)
|
|
{
|
|
if (!mlockall(MCL_CURRENT))
|
|
log(1, 0, 0, 0, "Locking pages into memory\n");
|
|
else
|
|
log(0, 0, 0, 0, "Can't lock pages: %s\n", strerror(errno));
|
|
}
|
|
|
|
alarm(1);
|
|
|
|
// Drop privileges here
|
|
if (config->target_uid > 0 && geteuid() == 0)
|
|
setuid(config->target_uid);
|
|
|
|
mainloop();
|
|
|
|
#ifdef BGP
|
|
/* try to shut BGP down cleanly; with luck the sockets will be
|
|
writable since we're out of the select */
|
|
{
|
|
int i;
|
|
for (i = 0; i < BGP_NUM_PEERS; i++)
|
|
if (bgp_peers[i].state == Established)
|
|
bgp_stop(&bgp_peers[i]);
|
|
}
|
|
#endif /* BGP */
|
|
|
|
/* remove plugins (so cleanup code gets run) */
|
|
plugins_done();
|
|
|
|
// Remove the PID file if we wrote it
|
|
if (config->wrote_pid && *config->pid_file == '/')
|
|
unlink(config->pid_file);
|
|
|
|
/* kill CLI children */
|
|
signal(SIGTERM, SIG_IGN);
|
|
kill(0, SIGTERM);
|
|
return 0;
|
|
}
|
|
|
|
void sighup_handler(int junk)
|
|
{
|
|
if (log_stream && log_stream != stderr)
|
|
{
|
|
fclose(log_stream);
|
|
log_stream = NULL;
|
|
}
|
|
|
|
read_config_file();
|
|
}
|
|
|
|
void sigalrm_handler(int junk)
|
|
{
|
|
// Log current traffic stats
|
|
|
|
snprintf(config->bandwidth, sizeof(config->bandwidth),
|
|
"UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
|
|
(udp_rx / 1024.0 / 1024.0 * 8),
|
|
(eth_tx / 1024.0 / 1024.0 * 8),
|
|
(eth_rx / 1024.0 / 1024.0 * 8),
|
|
(udp_tx / 1024.0 / 1024.0 * 8),
|
|
((udp_tx + udp_rx + eth_tx + eth_rx) / 1024.0 / 1024.0 * 8),
|
|
udp_rx_pkt, eth_rx_pkt);
|
|
|
|
udp_tx = udp_rx = 0;
|
|
udp_rx_pkt = eth_rx_pkt = 0;
|
|
eth_tx = eth_rx = 0;
|
|
|
|
if (config->dump_speed)
|
|
printf("%s\n", config->bandwidth);
|
|
|
|
// Update the internal time counter
|
|
time(&time_now);
|
|
strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
|
|
alarm(1);
|
|
|
|
{
|
|
// Run timer hooks
|
|
struct param_timer p = { time_now };
|
|
run_plugins(PLUGIN_TIMER, &p);
|
|
}
|
|
|
|
}
|
|
|
|
void sigterm_handler(int junk)
|
|
{
|
|
log(1, 0, 0, 0, "Shutting down cleanly\n");
|
|
if (config->save_state)
|
|
dump_state();
|
|
|
|
main_quit++;
|
|
}
|
|
|
|
void sigquit_handler(int junk)
|
|
{
|
|
int i;
|
|
|
|
log(1, 0, 0, 0, "Shutting down without saving sessions\n");
|
|
for (i = 1; i < MAXSESSION; i++)
|
|
{
|
|
if (session[i].opened)
|
|
sessionkill(i, "L2TPNS Closing");
|
|
}
|
|
for (i = 1; i < MAXTUNNEL; i++)
|
|
{
|
|
if (tunnel[i].ip || tunnel[i].state)
|
|
tunnelshutdown(i, "L2TPNS Closing");
|
|
}
|
|
|
|
main_quit++;
|
|
}
|
|
|
|
void sigchild_handler(int signal)
|
|
{
|
|
while (waitpid(-1, NULL, WNOHANG) > 0)
|
|
;
|
|
}
|
|
|
|
void read_state()
|
|
{
|
|
struct stat sb;
|
|
int i;
|
|
ippoolt itmp;
|
|
FILE *f;
|
|
char magic[sizeof(DUMP_MAGIC) - 1];
|
|
u32 buf[2];
|
|
|
|
if (!config->save_state)
|
|
{
|
|
unlink(STATEFILE);
|
|
return ;
|
|
}
|
|
|
|
if (stat(STATEFILE, &sb) < 0)
|
|
{
|
|
unlink(STATEFILE);
|
|
return ;
|
|
}
|
|
|
|
if (sb.st_mtime < (time(NULL) - 60))
|
|
{
|
|
log(0, 0, 0, 0, "State file is too old to read, ignoring\n");
|
|
unlink(STATEFILE);
|
|
return ;
|
|
}
|
|
|
|
f = fopen(STATEFILE, "r");
|
|
unlink(STATEFILE);
|
|
|
|
if (!f)
|
|
{
|
|
log(0, 0, 0, 0, "Can't read state file: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
if (fread(magic, sizeof(magic), 1, f) != 1 || strncmp(magic, DUMP_MAGIC, sizeof(magic)))
|
|
{
|
|
log(0, 0, 0, 0, "Bad state file magic\n");
|
|
exit(1);
|
|
}
|
|
|
|
log(1, 0, 0, 0, "Reading state information\n");
|
|
if (fread(buf, sizeof(buf), 1, f) != 1 || buf[0] > MAXIPPOOL || buf[1] != sizeof(ippoolt))
|
|
{
|
|
log(0, 0, 0, 0, "Error/mismatch reading ip pool header from state file\n");
|
|
exit(1);
|
|
}
|
|
|
|
if (buf[0] > ip_pool_size)
|
|
{
|
|
log(0, 0, 0, 0, "ip pool has shrunk! state = %d, current = %d\n", buf[0], ip_pool_size);
|
|
exit(1);
|
|
}
|
|
|
|
log(2, 0, 0, 0, "Loading %u ip addresses\n", buf[0]);
|
|
for (i = 0; i < buf[0]; i++)
|
|
{
|
|
if (fread(&itmp, sizeof(itmp), 1, f) != 1)
|
|
{
|
|
log(0, 0, 0, 0, "Error reading ip %d from state file: %s\n", i, strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
if (itmp.address != ip_address_pool[i].address)
|
|
{
|
|
log(0, 0, 0, 0, "Mismatched ip %d from state file: pool may only be extended\n", i);
|
|
exit(1);
|
|
}
|
|
|
|
memcpy(&ip_address_pool[i], &itmp, sizeof(itmp));
|
|
}
|
|
|
|
if (fread(buf, sizeof(buf), 1, f) != 1 || buf[0] != MAXTUNNEL || buf[1] != sizeof(tunnelt))
|
|
{
|
|
log(0, 0, 0, 0, "Error/mismatch reading tunnel header from state file\n");
|
|
exit(1);
|
|
}
|
|
|
|
log(2, 0, 0, 0, "Loading %u tunnels\n", MAXTUNNEL);
|
|
if (fread(tunnel, sizeof(tunnelt), MAXTUNNEL, f) != MAXTUNNEL)
|
|
{
|
|
log(0, 0, 0, 0, "Error reading tunnel data from state file\n");
|
|
exit(1);
|
|
}
|
|
|
|
for (i = 0; i < MAXTUNNEL; i++)
|
|
{
|
|
tunnel[i].controlc = 0;
|
|
tunnel[i].controls = NULL;
|
|
tunnel[i].controle = NULL;
|
|
if (*tunnel[i].hostname)
|
|
log(3, 0, 0, 0, "Created tunnel for %s\n", tunnel[i].hostname);
|
|
}
|
|
|
|
if (fread(buf, sizeof(buf), 1, f) != 1 || buf[0] != MAXSESSION || buf[1] != sizeof(sessiont))
|
|
{
|
|
log(0, 0, 0, 0, "Error/mismatch reading session header from state file\n");
|
|
exit(1);
|
|
}
|
|
|
|
log(2, 0, 0, 0, "Loading %u sessions\n", MAXSESSION);
|
|
if (fread(session, sizeof(sessiont), MAXSESSION, f) != MAXSESSION)
|
|
{
|
|
log(0, 0, 0, 0, "Error reading session data from state file\n");
|
|
exit(1);
|
|
}
|
|
|
|
for (i = 0; i < MAXSESSION; i++)
|
|
{
|
|
session[i].tbf_in = 0;
|
|
session[i].tbf_out = 0;
|
|
if (session[i].opened)
|
|
{
|
|
log(2, 0, i, 0, "Loaded active session for user %s\n", session[i].user);
|
|
if (session[i].ip)
|
|
sessionsetup(session[i].tunnel, i);
|
|
}
|
|
}
|
|
|
|
fclose(f);
|
|
log(0, 0, 0, 0, "Loaded saved state information\n");
|
|
}
|
|
|
|
void dump_state()
|
|
{
|
|
FILE *f;
|
|
u32 buf[2];
|
|
|
|
if (!config->save_state)
|
|
return;
|
|
|
|
do
|
|
{
|
|
if (!(f = fopen(STATEFILE, "w")))
|
|
break;
|
|
|
|
log(1, 0, 0, 0, "Dumping state information\n");
|
|
|
|
if (fwrite(DUMP_MAGIC, sizeof(DUMP_MAGIC) - 1, 1, f) != 1)
|
|
break;
|
|
|
|
log(2, 0, 0, 0, "Dumping %u ip addresses\n", ip_pool_size);
|
|
buf[0] = ip_pool_size;
|
|
buf[1] = sizeof(ippoolt);
|
|
if (fwrite(buf, sizeof(buf), 1, f) != 1)
|
|
break;
|
|
if (fwrite(ip_address_pool, sizeof(ippoolt), ip_pool_size, f) != ip_pool_size)
|
|
break;
|
|
|
|
log(2, 0, 0, 0, "Dumping %u tunnels\n", MAXTUNNEL);
|
|
buf[0] = MAXTUNNEL;
|
|
buf[1] = sizeof(tunnelt);
|
|
if (fwrite(buf, sizeof(buf), 1, f) != 1)
|
|
break;
|
|
if (fwrite(tunnel, sizeof(tunnelt), MAXTUNNEL, f) != MAXTUNNEL)
|
|
break;
|
|
|
|
log(2, 0, 0, 0, "Dumping %u sessions\n", MAXSESSION);
|
|
buf[0] = MAXSESSION;
|
|
buf[1] = sizeof(sessiont);
|
|
if (fwrite(buf, sizeof(buf), 1, f) != 1)
|
|
break;
|
|
if (fwrite(session, sizeof(sessiont), MAXSESSION, f) != MAXSESSION)
|
|
break;
|
|
|
|
if (fclose(f) == 0)
|
|
return ; // OK
|
|
}
|
|
while (0);
|
|
|
|
log(0, 0, 0, 0, "Can't write state information: %s\n", strerror(errno));
|
|
unlink(STATEFILE);
|
|
}
|
|
|
|
void build_chap_response(char *challenge, u8 id, u16 challenge_length, char **challenge_response)
|
|
{
|
|
MD5_CTX ctx;
|
|
*challenge_response = NULL;
|
|
|
|
if (!*config->l2tpsecret)
|
|
{
|
|
log(0, 0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
|
|
return;
|
|
}
|
|
|
|
log(4, 0, 0, 0, " Building challenge response for CHAP request\n");
|
|
|
|
*challenge_response = (char *)calloc(17, 1);
|
|
|
|
MD5Init(&ctx);
|
|
MD5Update(&ctx, &id, 1);
|
|
MD5Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret));
|
|
MD5Update(&ctx, challenge, challenge_length);
|
|
MD5Final(*challenge_response, &ctx);
|
|
|
|
return;
|
|
}
|
|
|
|
static int facility_value(char *name)
|
|
{
|
|
int i;
|
|
for (i = 0; facilitynames[i].c_name; i++)
|
|
{
|
|
if (strcmp(facilitynames[i].c_name, name) == 0)
|
|
return facilitynames[i].c_val;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void update_config()
|
|
{
|
|
int i;
|
|
static int timeout = 0;
|
|
static int interval = 0;
|
|
|
|
// Update logging
|
|
closelog();
|
|
syslog_log = 0;
|
|
if (log_stream)
|
|
{
|
|
fclose(log_stream);
|
|
log_stream = NULL;
|
|
}
|
|
if (*config->log_filename)
|
|
{
|
|
if (strstr(config->log_filename, "syslog:") == config->log_filename)
|
|
{
|
|
char *p = config->log_filename + 7;
|
|
if (*p)
|
|
{
|
|
openlog("l2tpns", LOG_PID, facility_value(p));
|
|
syslog_log = 1;
|
|
}
|
|
}
|
|
else if (strchr(config->log_filename, '/') == config->log_filename)
|
|
{
|
|
if ((log_stream = fopen((char *)(config->log_filename), "a")))
|
|
{
|
|
fseek(log_stream, 0, SEEK_END);
|
|
setbuf(log_stream, NULL);
|
|
}
|
|
else
|
|
{
|
|
log_stream = stderr;
|
|
setbuf(log_stream, NULL);
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
log_stream = stderr;
|
|
setbuf(log_stream, NULL);
|
|
}
|
|
|
|
|
|
// Update radius
|
|
config->numradiusservers = 0;
|
|
for (i = 0; i < MAXRADSERVER; i++)
|
|
if (config->radiusserver[i])
|
|
{
|
|
config->numradiusservers++;
|
|
// Set radius port: if not set, take the port from the
|
|
// first radius server. For the first radius server,
|
|
// take the #defined default value from l2tpns.h
|
|
|
|
// test twice, In case someone works with
|
|
// a secondary radius server without defining
|
|
// a primary one, this will work even then.
|
|
if (i>0 && !config->radiusport[i])
|
|
config->radiusport[i] = config->radiusport[i-1];
|
|
if (!config->radiusport[i])
|
|
config->radiusport[i] = RADPORT;
|
|
}
|
|
|
|
if (!config->numradiusservers)
|
|
{
|
|
log(0, 0, 0, 0, "No RADIUS servers defined!\n");
|
|
}
|
|
|
|
config->num_radfds = 2 << RADIUS_SHIFT;
|
|
|
|
// Update plugins
|
|
for (i = 0; i < MAXPLUGINS; i++)
|
|
{
|
|
if (strcmp(config->plugins[i], config->old_plugins[i]) == 0)
|
|
continue;
|
|
if (*config->plugins[i])
|
|
{
|
|
// Plugin added
|
|
add_plugin(config->plugins[i]);
|
|
}
|
|
else if (*config->old_plugins[i])
|
|
{
|
|
// Plugin removed
|
|
remove_plugin(config->old_plugins[i]);
|
|
}
|
|
}
|
|
memcpy(config->old_plugins, config->plugins, sizeof(config->plugins));
|
|
if (!config->cleanup_interval) config->cleanup_interval = 10;
|
|
if (!config->multi_read_count) config->multi_read_count = 10;
|
|
if (!config->cluster_address) config->cluster_address = inet_addr(DEFAULT_MCAST_ADDR);
|
|
if (!*config->cluster_interface)
|
|
strncpy(config->cluster_interface, DEFAULT_MCAST_INTERFACE, sizeof(config->cluster_interface) - 1);
|
|
|
|
if (!config->cluster_hb_interval)
|
|
config->cluster_hb_interval = PING_INTERVAL; // Heartbeat every 0.5 seconds.
|
|
|
|
if (!config->cluster_hb_timeout)
|
|
config->cluster_hb_timeout = HB_TIMEOUT; // 10 missed heartbeat triggers an election.
|
|
|
|
if (interval != config->cluster_hb_interval || timeout != config->cluster_hb_timeout)
|
|
{
|
|
// Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
|
|
// late, ensure we're sufficiently larger than that
|
|
int t = 4 * config->cluster_hb_interval + 11;
|
|
|
|
if (config->cluster_hb_timeout < t)
|
|
{
|
|
log(0,0,0,0, "Heartbeat timeout %d too low, adjusting to %d\n", config->cluster_hb_timeout, t);
|
|
config->cluster_hb_timeout = t;
|
|
}
|
|
|
|
// Push timing changes to the slaves immediately if we're the master
|
|
if (config->cluster_iam_master)
|
|
cluster_heartbeat();
|
|
|
|
interval = config->cluster_hb_interval;
|
|
timeout = config->cluster_hb_timeout;
|
|
}
|
|
|
|
// Write PID file
|
|
if (*config->pid_file == '/' && !config->wrote_pid)
|
|
{
|
|
FILE *f;
|
|
if ((f = fopen(config->pid_file, "w")))
|
|
{
|
|
fprintf(f, "%d\n", getpid());
|
|
fclose(f);
|
|
config->wrote_pid = 1;
|
|
}
|
|
else
|
|
{
|
|
log(0, 0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno));
|
|
}
|
|
}
|
|
|
|
config->reload_config = 0;
|
|
}
|
|
|
|
void read_config_file()
|
|
{
|
|
FILE *f;
|
|
|
|
if (!config->config_file) return;
|
|
if (!(f = fopen(config->config_file, "r")))
|
|
{
|
|
fprintf(stderr, "Can't open config file %s: %s\n", config->config_file, strerror(errno));
|
|
return;
|
|
}
|
|
|
|
log(3, 0, 0, 0, "Reading config file %s\n", config->config_file);
|
|
cli_do_file(f);
|
|
log(3, 0, 0, 0, "Done reading config file\n");
|
|
fclose(f);
|
|
update_config();
|
|
}
|
|
|
|
int sessionsetup(tunnelidt t, sessionidt s)
|
|
{
|
|
// A session now exists, set it up
|
|
ipt ip;
|
|
char *user;
|
|
sessionidt i;
|
|
int r;
|
|
|
|
CSTAT(call_sessionsetup);
|
|
|
|
|
|
log(3, session[s].ip, s, t, "Doing session setup for session\n");
|
|
|
|
if (!session[s].ip || session[s].ip == 0xFFFFFFFE)
|
|
{
|
|
assign_ip_address(s);
|
|
if (session[s].ip)
|
|
log(3, 0, s, t, " No IP allocated. Assigned %s from pool\n",
|
|
inet_toa(htonl(session[s].ip)));
|
|
else
|
|
log(0, 0, s, t, " No IP allocated. The IP address pool is FULL!\n");
|
|
}
|
|
|
|
|
|
// Make sure this is right
|
|
session[s].tunnel = t;
|
|
|
|
// zap old sessions with same IP and/or username
|
|
// Don't kill gardened sessions - doing so leads to a DoS
|
|
// from someone who doesn't need to know the password
|
|
{
|
|
ip = session[s].ip;
|
|
user = session[s].user;
|
|
for (i = 1; i <= config->cluster_highest_sessionid; i++)
|
|
{
|
|
if (i == s) continue;
|
|
if (ip == session[i].ip) sessionkill(i, "Duplicate IP address");
|
|
if (!session[s].walled_garden && !session[i].walled_garden && strcasecmp(user, session[i].user) == 0)
|
|
sessionkill(i, "Duplicate session for users");
|
|
}
|
|
}
|
|
|
|
// Add the route for this session.
|
|
//
|
|
// Static IPs need to be routed. Anything else
|
|
// is part of the IP address pool and is already routed,
|
|
// it just needs to be added to the IP cache.
|
|
if (session[s].ip_pool_index == -1) // static ip
|
|
routeset(s, session[s].ip, 0, 0, 1);
|
|
else
|
|
cache_ipmap(session[s].ip, s);
|
|
|
|
for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
|
|
routeset(s, session[s].route[r].ip, session[s].route[r].mask, session[s].ip, 1);
|
|
|
|
if (!session[s].sid)
|
|
{
|
|
// did this session just finish radius?
|
|
log(3, session[s].ip, s, t, "Sending initial IPCP to client\n");
|
|
sendipcp(t, s);
|
|
session[s].sid = ++last_sid;
|
|
}
|
|
|
|
// Run the plugin's against this new session.
|
|
{
|
|
struct param_new_session data = { &tunnel[t], &session[s] };
|
|
run_plugins(PLUGIN_NEW_SESSION, &data);
|
|
}
|
|
|
|
// Force throttling on or off (Actually : refresh the current throttling status)
|
|
// This has the advantage of cleaning up after another throttled user who may have left
|
|
// firewall rules lying around
|
|
throttle_session(s, session[s].throttle);
|
|
|
|
session[s].last_packet = time_now;
|
|
|
|
{
|
|
char *sessionip, *tunnelip;
|
|
sessionip = strdup(inet_toa(htonl(session[s].ip)));
|
|
tunnelip = strdup(inet_toa(htonl(tunnel[t].ip)));
|
|
log(2, session[s].ip, s, t, "Login by %s at %s from %s (%s)\n",
|
|
session[s].user, sessionip, tunnelip, tunnel[t].hostname);
|
|
if (sessionip) free(sessionip);
|
|
if (tunnelip) free(tunnelip);
|
|
}
|
|
|
|
cluster_send_session(s); // Mark it as dirty, and needing to the flooded to the cluster.
|
|
|
|
return 1; // RADIUS OK and IP allocated, done...
|
|
}
|
|
|
|
//
|
|
// This session just got dropped on us by the master or something.
|
|
// Make sure our tables up up to date...
|
|
//
|
|
int load_session(sessionidt s, sessiont *new)
|
|
{
|
|
int i;
|
|
|
|
// Sanity checks.
|
|
if (new->ip_pool_index >= MAXIPPOOL ||
|
|
new->tunnel >= MAXTUNNEL)
|
|
{
|
|
log(0,0,s,0, "Strange session update received!\n");
|
|
// FIXME! What to do here?
|
|
return 0;
|
|
}
|
|
|
|
//
|
|
// Ok. All sanity checks passed. Now we're committed to
|
|
// loading the new session.
|
|
//
|
|
|
|
session[s].tunnel = new->tunnel; // For logging in cache_ipmap
|
|
|
|
|
|
if (new->ip != session[s].ip) // Changed ip. fix up hash tables.
|
|
{
|
|
if (session[s].ip) // If there's an old one, remove it.
|
|
{
|
|
// Remove any routes if the IP has changed
|
|
for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)
|
|
{
|
|
routeset(s, session[s].route[i].ip, session[s].route[i].mask, session[s].ip, 0);
|
|
session[s].route[i].ip = 0;
|
|
}
|
|
|
|
if (session[s].ip_pool_index == -1) // static IP
|
|
routeset(s, session[s].ip, 0, 0, 0);
|
|
else // It's part of the IP pool, remove it manually.
|
|
uncache_ipmap(session[s].ip);
|
|
}
|
|
|
|
if (new->ip)
|
|
{
|
|
// If there's a new one, add it.
|
|
if (new->ip_pool_index == -1)
|
|
routeset(s, new->ip, 0, 0, 1);
|
|
else
|
|
cache_ipmap(new->ip, s);
|
|
}
|
|
}
|
|
|
|
// Update routed networks
|
|
for (i = 0; i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
|
|
{
|
|
if (new->route[i].ip == session[s].route[i].ip &&
|
|
new->route[i].mask == session[s].route[i].mask)
|
|
continue;
|
|
|
|
if (session[s].route[i].ip) // Remove the old one if it exists.
|
|
routeset(s, session[s].route[i].ip, session[s].route[i].mask, session[s].ip, 0);
|
|
|
|
if (new->route[i].ip) // Add the new one if it exists.
|
|
routeset(s, new->route[i].ip, new->route[i].mask, new->ip, 1);
|
|
}
|
|
|
|
if (new->tunnel && s > config->cluster_highest_sessionid) // Maintain this in the slave. It's used
|
|
// for walking the sessions to forward byte counts to the master.
|
|
config->cluster_highest_sessionid = s;
|
|
|
|
memcpy(&session[s], new, sizeof(session[s])); // Copy over..
|
|
|
|
// Do fixups into address pool.
|
|
if (new->ip_pool_index != -1)
|
|
fix_address_pool(s);
|
|
|
|
return 1;
|
|
}
|
|
|
|
#ifdef RINGBUFFER
|
|
void ringbuffer_dump(FILE *stream)
|
|
{
|
|
int i = ringbuffer->head;
|
|
|
|
while (i != ringbuffer->tail)
|
|
{
|
|
if (*ringbuffer->buffer[i].message)
|
|
fprintf(stream, "%d-%s", ringbuffer->buffer[i].level, ringbuffer->buffer[i].message);
|
|
if (++i == ringbuffer->tail) break;
|
|
if (i == RINGBUFFER_SIZE) i = 0;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
void initplugins()
|
|
{
|
|
int i;
|
|
|
|
loaded_plugins = ll_init();
|
|
// Initialize the plugins to nothing
|
|
for (i = 0; i < MAX_PLUGIN_TYPES; i++)
|
|
plugins[i] = ll_init();
|
|
}
|
|
|
|
static void *open_plugin(char *plugin_name, int load)
|
|
{
|
|
char path[256] = "";
|
|
|
|
snprintf(path, 256, PLUGINDIR "/%s.so", plugin_name);
|
|
log(2, 0, 0, 0, "%soading plugin from %s\n", load ? "L" : "Un-l", path);
|
|
return dlopen(path, RTLD_NOW);
|
|
}
|
|
|
|
void add_plugin(char *plugin_name)
|
|
{
|
|
static struct pluginfuncs funcs = {
|
|
_log,
|
|
_log_hex,
|
|
inet_toa,
|
|
sessionbyuser,
|
|
sessiontbysessionidt,
|
|
sessionidtbysessiont,
|
|
sessionkill,
|
|
radiusnew,
|
|
radiussend,
|
|
};
|
|
|
|
void *p = open_plugin(plugin_name, 1);
|
|
int (*initfunc)(struct pluginfuncs *);
|
|
int i;
|
|
|
|
if (!p)
|
|
{
|
|
log(1, 0, 0, 0, " Plugin load failed: %s\n", dlerror());
|
|
return;
|
|
}
|
|
|
|
if (ll_contains(loaded_plugins, p))
|
|
{
|
|
dlclose(p);
|
|
return;
|
|
}
|
|
|
|
{
|
|
int *v = dlsym(p, "__plugin_api_version");
|
|
if (!v || *v != PLUGIN_API_VERSION)
|
|
{
|
|
log(1, 0, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
|
|
dlclose(p);
|
|
return;
|
|
}
|
|
}
|
|
|
|
if ((initfunc = dlsym(p, "plugin_init")))
|
|
{
|
|
if (!initfunc(&funcs))
|
|
{
|
|
log(1, 0, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
|
|
dlclose(p);
|
|
return;
|
|
}
|
|
}
|
|
|
|
ll_push(loaded_plugins, p);
|
|
|
|
for (i = 0; i < max_plugin_functions; i++)
|
|
{
|
|
void *x;
|
|
if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
|
|
{
|
|
log(3, 0, 0, 0, " Supports function \"%s\"\n", plugin_functions[i]);
|
|
ll_push(plugins[i], x);
|
|
}
|
|
}
|
|
|
|
log(2, 0, 0, 0, " Loaded plugin %s\n", plugin_name);
|
|
}
|
|
|
|
static void run_plugin_done(void *plugin)
|
|
{
|
|
int (*donefunc)(void) = dlsym(plugin, "plugin_done");
|
|
|
|
if (donefunc)
|
|
donefunc();
|
|
}
|
|
|
|
void remove_plugin(char *plugin_name)
|
|
{
|
|
void *p = open_plugin(plugin_name, 0);
|
|
int i;
|
|
|
|
if (!p)
|
|
return;
|
|
|
|
for (i = 0; i < max_plugin_functions; i++)
|
|
{
|
|
void *x;
|
|
if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
|
|
ll_delete(plugins[i], x);
|
|
}
|
|
|
|
if (ll_contains(loaded_plugins, p))
|
|
{
|
|
ll_delete(loaded_plugins, p);
|
|
run_plugin_done(p);
|
|
}
|
|
|
|
dlclose(p);
|
|
log(2, 0, 0, 0, "Removed plugin %s\n", plugin_name);
|
|
}
|
|
|
|
int run_plugins(int plugin_type, void *data)
|
|
{
|
|
int (*func)(void *data);
|
|
if (!plugins[plugin_type] || plugin_type > max_plugin_functions) return 1;
|
|
|
|
ll_reset(plugins[plugin_type]);
|
|
while ((func = ll_next(plugins[plugin_type])))
|
|
{
|
|
int rc;
|
|
rc = func(data);
|
|
if (rc == PLUGIN_RET_STOP) return 1;
|
|
if (rc == PLUGIN_RET_ERROR) return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
void plugins_done()
|
|
{
|
|
void *p;
|
|
|
|
ll_reset(loaded_plugins);
|
|
while ((p = ll_next(loaded_plugins)))
|
|
run_plugin_done(p);
|
|
}
|
|
|
|
void processcontrol(u8 * buf, int len, struct sockaddr_in *addr)
|
|
{
|
|
char *resp;
|
|
int l;
|
|
struct param_control param = { buf, len, ntohl(addr->sin_addr.s_addr), ntohs(addr->sin_port), NULL, 0, 0 };
|
|
|
|
|
|
if (log_stream && config->debug >= 4)
|
|
{
|
|
log(4, ntohl(addr->sin_addr.s_addr), 0, 0, "Received ");
|
|
dump_packet(buf, log_stream);
|
|
}
|
|
|
|
resp = calloc(1400, 1);
|
|
l = new_packet(PKT_RESP_ERROR, resp);
|
|
*(int *)(resp + 6) = *(int *)(buf + 6);
|
|
|
|
param.type = ntohs(*(short *)(buf + 2));
|
|
param.id = ntohl(*(int *)(buf + 6));
|
|
param.data_length = ntohs(*(short *)(buf + 4)) - 10;
|
|
param.data = (param.data_length > 0) ? (char *)(buf + 10) : NULL;
|
|
param.response = resp;
|
|
param.response_length = l;
|
|
|
|
run_plugins(PLUGIN_CONTROL, ¶m);
|
|
|
|
if (param.send_response)
|
|
{
|
|
send_packet(controlfd, ntohl(addr->sin_addr.s_addr), ntohs(addr->sin_port), param.response, param.response_length);
|
|
log(4, ntohl(addr->sin_addr.s_addr), 0, 0, "Sent Control packet response\n");
|
|
}
|
|
|
|
free(resp);
|
|
}
|
|
|
|
/*
|
|
* HACK
|
|
* Go through all of the tunnels and do some cleanups
|
|
*/
|
|
void tunnel_clean()
|
|
{
|
|
int i;
|
|
|
|
log(1, 0, 0, 0, "Cleaning tunnels array\n");
|
|
|
|
for (i = 1; i < MAXTUNNEL; i++)
|
|
{
|
|
if (!tunnel[i].ip
|
|
|| !*tunnel[i].hostname
|
|
|| (tunnel[i].state == TUNNELDIE && tunnel[i].die >= time_now))
|
|
{
|
|
tunnelclear(i);
|
|
}
|
|
}
|
|
}
|
|
|
|
void tunnelclear(tunnelidt t)
|
|
{
|
|
if (!t) return;
|
|
memset(&tunnel[t], 0, sizeof(tunnel[t]));
|
|
tunnel[t].state = TUNNELFREE;
|
|
}
|
|
|
|
tunnelidt new_tunnel()
|
|
{
|
|
tunnelidt i;
|
|
for (i = 1; i < MAXTUNNEL; i++)
|
|
{
|
|
if (tunnel[i].state == TUNNELFREE)
|
|
{
|
|
log(4, 0, 0, i, "Assigning tunnel ID %d\n", i);
|
|
if (i > config->cluster_highest_tunnelid)
|
|
config->cluster_highest_tunnelid = i;
|
|
return i;
|
|
}
|
|
}
|
|
log(0, 0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
|
|
return 0;
|
|
}
|
|
|
|
//
|
|
// We're becoming the master. Do any required setup..
|
|
//
|
|
// This is principally telling all the plugins that we're
|
|
// now a master, and telling them about all the sessions
|
|
// that are active too..
|
|
//
|
|
void become_master(void)
|
|
{
|
|
int s;
|
|
run_plugins(PLUGIN_BECOME_MASTER, NULL);
|
|
|
|
for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
|
|
{
|
|
if (!session[s].tunnel) // Not an in-use session.
|
|
continue;
|
|
|
|
run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc)
|
|
{
|
|
int s, i;
|
|
int count = 0;
|
|
int buckets[64];
|
|
|
|
if (CLI_HELP_REQUESTED)
|
|
return CLI_HELP_NO_ARGS;
|
|
|
|
time(&time_now);
|
|
for (i = 0; i < 64;++i) buckets[i] = 0;
|
|
|
|
for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
|
|
{
|
|
int idle;
|
|
if (!session[s].tunnel)
|
|
continue;
|
|
|
|
idle = time_now - session[s].last_packet;
|
|
idle /= 5 ; // In multiples of 5 seconds.
|
|
if (idle < 0)
|
|
idle = 0;
|
|
if (idle > 63)
|
|
idle = 63;
|
|
|
|
++count;
|
|
++buckets[idle];
|
|
}
|
|
|
|
for (i = 0; i < 63; ++i)
|
|
{
|
|
cli_print(cli, "%3d seconds : %7.2f%% (%6d)", i * 5, (double) buckets[i] * 100.0 / count , buckets[i]);
|
|
}
|
|
cli_print(cli, "lots of secs : %7.2f%% (%6d)", (double) buckets[63] * 100.0 / count , buckets[i]);
|
|
cli_print(cli, "%d total sessions open.", count);
|
|
return CLI_OK;
|
|
}
|
|
|
|
int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc)
|
|
{
|
|
int s, i;
|
|
int count = 0;
|
|
int buckets[64];
|
|
|
|
if (CLI_HELP_REQUESTED)
|
|
return CLI_HELP_NO_ARGS;
|
|
|
|
time(&time_now);
|
|
for (i = 0; i < 64;++i) buckets[i] = 0;
|
|
|
|
for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
|
|
{
|
|
int open = 0, d;
|
|
if (!session[s].tunnel)
|
|
continue;
|
|
|
|
d = time_now - session[s].opened;
|
|
if (d < 0)
|
|
d = 0;
|
|
while (d > 1 && open < 32)
|
|
{
|
|
++open;
|
|
d >>= 1; // half.
|
|
}
|
|
++count;
|
|
++buckets[open];
|
|
}
|
|
|
|
s = 1;
|
|
for (i = 0; i < 30; ++i)
|
|
{
|
|
cli_print(cli, " < %8d seconds : %7.2f%% (%6d)", s, (double) buckets[i] * 100.0 / count , buckets[i]);
|
|
s <<= 1;
|
|
}
|
|
cli_print(cli, "%d total sessions open.", count);
|
|
return CLI_OK;
|
|
}
|