513 lines
15 KiB
C
513 lines
15 KiB
C
/*
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*
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***** BEGIN LICENSE BLOCK *****
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Copyright (C) 2022 Olof Hagsand and Kristofer Hallin
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This file is part of CLIXON.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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Alternatively, the contents of this file may be used under the terms of
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the GNU General Public License Version 3 or later (the "GPL"),
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in which case the provisions of the GPL are applicable instead
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of those above. If you wish to allow use of your version of this file only
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under the terms of the GPL, and not to allow others to
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use your version of this file under the terms of Apache License version 2,
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indicate your decision by deleting the provisions above and replace them with
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the notice and other provisions required by the GPL. If you do not delete
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the provisions above, a recipient may use your version of this file under
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the terms of any one of the Apache License version 2 or the GPL.
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***** END LICENSE BLOCK *****
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*/
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#ifdef HAVE_CONFIG_H
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#include "clixon_config.h" /* generated by config & autoconf */
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#endif
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#include <stdio.h>
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#include <unistd.h>
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#include <pwd.h>
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#include <syslog.h>
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#include <errno.h>
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#include <signal.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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/* net-snmp */
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#include <net-snmp/net-snmp-config.h>
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#include <net-snmp/net-snmp-includes.h>
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#include <net-snmp/agent/net-snmp-agent-includes.h>
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/* cligen */
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#include <cligen/cligen.h>
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/* clicon */
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#include <clixon/clixon.h>
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#include "snmp_register.h"
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/* Command line options to be passed to getopt(3) */
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#define SNMP_OPTS "hD:f:l:o:z"
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/*! Return (hardcoded) pid file
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*/
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static char*
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clicon_snmp_pidfile(clicon_handle h)
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{
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return "/var/tmp/clixon_snmp.pid";
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}
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/*! Signal terminates process
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* Just set exit flag for proper exit in event loop
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*/
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static void
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clixon_snmp_sig_term(int arg)
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{
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clicon_log(LOG_NOTICE, "%s: %s: pid: %u Signal %d",
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__PROGRAM__, __FUNCTION__, getpid(), arg);
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/* This should ensure no more accepts or incoming packets are processed because next time eventloop
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* is entered, it will terminate.
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* However there may be a case of sockets closing rather abruptly for clients
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*/
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clixon_exit_set(1);
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}
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/*! Callback for single socket
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* This is a workaround for netsnmps API usiing fdset:s, instead an fdset is created before calling
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* the snmp api
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* @param[in] s Read socket
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* @param[in] arg Clixon handle
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*/
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static int
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clixon_snmp_input_cb(int s,
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void *arg)
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{
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int retval = -1;
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fd_set readfds;
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// clicon_handle h = (clicon_handle)arg;
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clicon_debug(2, "%s", __FUNCTION__);
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FD_ZERO(&readfds);
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FD_SET(s, &readfds);
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snmp_read(&readfds);
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retval = 0;
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// done:
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return retval;
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}
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/*! Get which sockets are used from SNMP API, the register single sockets into clixon event system
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*
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* This is a workaround for netsnmps API usiing fdset:s, instead an fdset is created before calling
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* the snmp api
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* if you use select(), see snmp_select_info() in snmp_api(3)
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* snmp_select_info(int *numfds, fd_set *fdset, struct timeval *timeout, int *block)
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* @see clixon_snmp_input_cb
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*/
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static int
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clixon_snmp_fdset_register(clicon_handle h)
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{
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int retval = -1;
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int numfds = 0;
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fd_set readfds;
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struct timeval timeout = { LONG_MAX, 0 };
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int block = 0;
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int nr;
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int i;
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FD_ZERO(&readfds);
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if ((nr = snmp_sess_select_info(NULL, &numfds, &readfds, &timeout, &block)) < 0){
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clicon_err(OE_XML, errno, "snmp_select_error");
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goto done;
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}
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for (i=0; i<numfds; i++){
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if (FD_ISSET(i, &readfds)){
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if (clixon_event_reg_fd(i, clixon_snmp_input_cb, h, "snmp socket") < 0)
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goto done;
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}
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}
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retval = 0;
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done:
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return retval;
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}
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/*! Init netsnmp agent connection
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* @param[in] h Clixon handle
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* @param[in] logdst Log destination, see clixon_log.h
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* @see snmp_terminate
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*/
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static int
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clixon_snmp_subagent(clicon_handle h,
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int logdst)
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{
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int retval = -1;
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char *sockpath = NULL;
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clicon_debug(1, "%s", __FUNCTION__);
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if (logdst == CLICON_LOG_SYSLOG)
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snmp_enable_calllog();
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else
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snmp_enable_stderrlog();
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/* make a agentx client. */
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netsnmp_ds_set_boolean(NETSNMP_DS_APPLICATION_ID, NETSNMP_DS_AGENT_ROLE, 1);
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if ((sockpath = clicon_option_str(h, "CLICON_SNMP_AGENT_SOCK")) == NULL){
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clicon_err(OE_XML, 0, "CLICON_SNMP_AGENT_SOCK not set");
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goto done;
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}
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/* XXX: This should be configurable. */
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netsnmp_ds_set_string(NETSNMP_DS_APPLICATION_ID, NETSNMP_DS_AGENT_X_SOCKET, sockpath);
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/* initialize the agent library */
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init_agent(__PROGRAM__);
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/* example-demon will be used to read example-demon.conf files. */
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init_snmp(__PROGRAM__);
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if (set_signal(SIGTERM, clixon_snmp_sig_term, NULL) < 0){
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clicon_err(OE_DAEMON, errno, "Setting signal");
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goto done;
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}
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if (set_signal(SIGINT, clixon_snmp_sig_term, NULL) < 0){
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clicon_err(OE_DAEMON, errno, "Setting signal");
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goto done;
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}
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if (set_signal(SIGPIPE, SIG_IGN, NULL) < 0){
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clicon_err(OE_UNIX, errno, "Setting SIGPIPE signal");
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goto done;
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}
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/* Workaround for netsnmps API use of fdset:s instead of sockets */
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if (clixon_snmp_fdset_register(h) < 0)
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goto done;
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retval = 0;
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done:
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return retval;
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}
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/* Specialized SNMP error category log/err callback
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*
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* This function displays all negative SNMP errors on the form SNMPERR_* that are not SNMPERR_SUCCESS(=0)
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* There are also positive SNMP errors on the form SNMP_ERR_* which are not properly handled below
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* @param[in] handle Application-specific handle
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* @param[in] suberr Application-specific handle
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* @param[out] cb Read log/error string into this buffer
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* @note Some SNMP API functions sometimes returns NULL/ptr or other return values that do not fall into
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* this category, then OE_SNMP should NOT be used.
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*/
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static int
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clixon_snmp_err_cb(void *handle,
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int suberr,
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cbuf *cb)
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{
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const char *errstr;
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clicon_debug(1, "%s", __FUNCTION__);
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if (suberr < 0){
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if ((errstr = snmp_api_errstring(suberr)) == NULL)
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cprintf(cb, "unknown error %d", suberr);
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else
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cprintf(cb, "%s", errstr);
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}
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else{ /* See eg SNMP_ERR_* in snmp.h for positive error numbers, are they applicable here? */
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cprintf(cb, "unknown error %d", suberr);
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}
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return 0;
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}
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/*! Clean and close all state of netconf process (but dont exit).
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* Cannot use h after this
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* @param[in] h Clixon handle
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*/
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static int
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snmp_terminate(clicon_handle h)
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{
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yang_stmt *yspec;
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cvec *nsctx;
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cxobj *x;
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char *pidfile = clicon_snmp_pidfile(h);
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shutdown_agent();
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clicon_rpc_close_session(h);
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if ((yspec = clicon_dbspec_yang(h)) != NULL)
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ys_free(yspec);
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if ((yspec = clicon_config_yang(h)) != NULL)
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ys_free(yspec);
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if ((nsctx = clicon_nsctx_global_get(h)) != NULL)
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cvec_free(nsctx);
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if ((x = clicon_conf_xml(h)) != NULL)
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xml_free(x);
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xpath_optimize_exit();
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clixon_event_exit();
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clicon_handle_exit(h);
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clixon_err_exit();
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clicon_log_exit();
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if (pidfile)
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unlink(pidfile);
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return 0;
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}
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/*! Usage help routine
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* @param[in] h Clixon handle
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* @param[in] argv0 command line
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*/
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static void
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usage(clicon_handle h,
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char *argv0)
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{
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fprintf(stderr, "usage:%s\n"
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"where options are\n"
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"\t-h\t\tHelp\n"
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"\t-D <level>\tDebug level\n"
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"\t-f <file>\tConfiguration file (mandatory)\n"
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"\t-l (e|o|s|f<file>) Log on std(e)rr, std(o)ut, (s)yslog(default), (f)ile\n"
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"\t-z\t\tKill other %s daemon and exit\n"
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"\t-o \"<option>=<value>\"\tGive configuration option overriding config file (see clixon-config.yang)\n",
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argv0, argv0
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);
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exit(0);
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}
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int
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main(int argc,
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char **argv)
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{
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int retval = -1;
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int c;
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char *argv0 = argv[0];
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clicon_handle h;
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int logdst = CLICON_LOG_STDERR;
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struct passwd *pw;
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yang_stmt *yspec = NULL;
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char *str;
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uint32_t id;
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cvec *nsctx_global = NULL; /* Global namespace context */
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size_t cligen_buflen;
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size_t cligen_bufthreshold;
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int dbg = 0;
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size_t sz;
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int pid;
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char *pidfile = NULL;
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struct stat st;
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int zap = 0;
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/* Create handle */
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if ((h = clicon_handle_init()) == NULL)
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return -1;
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/* In the startup, logs to stderr & debug flag set later */
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clicon_log_init(__PROGRAM__, LOG_INFO, logdst);
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/* Set username to clixon handle. Use in all communication to backend */
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if ((pw = getpwuid(getuid())) == NULL){
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clicon_err(OE_UNIX, errno, "getpwuid");
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goto done;
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}
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if (clicon_username_set(h, pw->pw_name) < 0)
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goto done;
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while ((c = getopt(argc, argv, SNMP_OPTS)) != -1)
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switch (c) {
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case 'h' : /* help */
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usage(h, argv[0]);
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break;
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case 'D' : /* debug */
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if (sscanf(optarg, "%d", &dbg) != 1)
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usage(h, argv[0]);
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break;
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case 'f': /* override config file */
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if (!strlen(optarg))
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usage(h, argv[0]);
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clicon_option_str_set(h, "CLICON_CONFIGFILE", optarg);
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break;
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case 'l': /* Log destination: s|e|o */
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if ((logdst = clicon_log_opt(optarg[0])) < 0)
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usage(h, argv[0]);
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if (logdst == CLICON_LOG_FILE &&
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strlen(optarg)>1 &&
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clicon_log_file(optarg+1) < 0)
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goto done;
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break;
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}
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/*
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* Logs, error and debug to stderr or syslog, set debug level
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*/
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clicon_log_init(__PROGRAM__, dbg?LOG_DEBUG:LOG_INFO, logdst);
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clicon_debug_init(dbg, NULL);
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/*
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* Register error category and error/log callbacks for netsnmp special error handling
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*/
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if (clixon_err_cat_reg(OE_SNMP, /* category */
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h, /* handle (can be NULL) */
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clixon_snmp_err_cb /* log fn */
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) < 0)
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goto done;
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yang_init(h);
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/* Find, read and parse configfile */
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if (clicon_options_main(h) < 0)
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goto done;
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/* Now rest of options */
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optind = 1;
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opterr = 0;
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while ((c = getopt(argc, argv, SNMP_OPTS)) != -1)
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switch (c) {
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case 'h' : /* help */
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case 'D' : /* debug */
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case 'f': /* config file */
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case 'l': /* log */
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break; /* see above */
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case 'o':{ /* Configuration option */
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char *val;
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if ((val = index(optarg, '=')) == NULL)
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usage(h, argv0);
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*val++ = '\0';
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if (clicon_option_add(h, optarg, val) < 0)
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goto done;
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break;
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}
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case 'z': /* Zap other process */
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zap++;
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break;
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default:
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usage(h, argv[0]);
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break;
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}
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argc -= optind;
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argv += optind;
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/* Access the remaining argv/argc options (after --) w clicon-argv_get() */
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clicon_argv_set(h, argv0, argc, argv);
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/* Check pid-file, if zap kill the old daemon, else return here */
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if ((pidfile = clicon_snmp_pidfile(h)) == NULL){
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clicon_err(OE_FATAL, 0, "pidfile not set");
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goto done;
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}
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if (pidfile_get(pidfile, &pid) < 0)
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goto done;
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if (zap){
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if (pid && pidfile_zapold(pid) < 0)
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return -1;
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if (lstat(pidfile, &st) == 0)
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unlink(pidfile);
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snmp_terminate(h);
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exit(0); /* OK */
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}
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else if (pid){
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clicon_err(OE_DAEMON, 0, "Clixon_snmp daemon already running with pid %d\n(Try killing it with %s -z)",
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pid, argv0);
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return -1; /* goto done deletes pidfile */
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}
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/* Here there is either no old process or we have killed it,.. */
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if (lstat(pidfile, &st) == 0)
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unlink(pidfile);
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/* Init cligen buffers */
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cligen_buflen = clicon_option_int(h, "CLICON_CLI_BUF_START");
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cligen_bufthreshold = clicon_option_int(h, "CLICON_CLI_BUF_THRESHOLD");
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cbuf_alloc_set(cligen_buflen, cligen_bufthreshold);
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if ((sz = clicon_option_int(h, "CLICON_LOG_STRING_LIMIT")) != 0)
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clicon_log_string_limit_set(sz);
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/* Set default namespace according to CLICON_NAMESPACE_NETCONF_DEFAULT */
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xml_nsctx_namespace_netconf_default(h);
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/* Add (hardcoded) netconf features in case ietf-netconf loaded here
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* Otherwise it is loaded in netconf_module_load below
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*/
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if (netconf_module_features(h) < 0)
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goto done;
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/* Create top-level yang spec and store as option */
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if ((yspec = yspec_new()) == NULL)
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goto done;
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clicon_dbspec_yang_set(h, yspec);
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/* Load Yang modules
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* 1. Load a yang module as a specific absolute filename */
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if ((str = clicon_yang_main_file(h)) != NULL){
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if (yang_spec_parse_file(h, str, yspec) < 0)
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goto done;
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}
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/* 2. Load a (single) main module */
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if ((str = clicon_yang_module_main(h)) != NULL){
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if (yang_spec_parse_module(h, str, clicon_yang_module_revision(h),
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yspec) < 0)
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goto done;
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}
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/* 3. Load all modules in a directory */
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if ((str = clicon_yang_main_dir(h)) != NULL){
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if (yang_spec_load_dir(h, str, yspec) < 0)
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goto done;
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}
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/* Load clixon lib yang module */
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if (yang_spec_parse_module(h, "clixon-lib", NULL, yspec) < 0)
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goto done;
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/* Load yang module library, RFC7895 */
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if (yang_modules_init(h) < 0)
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goto done;
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/* Add netconf yang spec, used by netconf client and as internal protocol */
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if (netconf_module_load(h) < 0)
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goto done;
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/* Here all modules are loaded
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* Compute and set canonical namespace context
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*/
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if (xml_nsctx_yangspec(yspec, &nsctx_global) < 0)
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goto done;
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if (clicon_nsctx_global_set(h, nsctx_global) < 0)
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goto done;
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if (dbg)
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clicon_option_dump(h, dbg);
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/* Get session id from backend hello */
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clicon_session_id_set(h, getpid());
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/* Send hello request to backend to get session-id back
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* This is done once at the beginning of the session and then this is
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* used by the client, even though new TCP sessions are created for
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* each message sent to the backend.
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*/
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if (clicon_hello_req(h, &id) < 0)
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goto done;
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clicon_session_id_set(h, id);
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/* Init snmp as subagent */
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if (clixon_snmp_subagent(h, logdst) < 0)
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goto done;
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/* Init and traverse mib-translated yangs and register callbacks */
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if (clixon_snmp_traverse_mibyangs(h) < 0)
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goto done;
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|
|
|
|
/* Write pid-file */
|
|
if (pidfile_write(pidfile) < 0)
|
|
goto done;
|
|
/* main event loop */
|
|
if (clixon_event_loop(h) < 0)
|
|
goto done;
|
|
retval = 0;
|
|
done:
|
|
snmp_terminate(h);
|
|
clicon_log_init(__PROGRAM__, LOG_INFO, 0); /* Log on syslog no stderr */
|
|
clicon_log(LOG_NOTICE, "%s: %u Terminated", __PROGRAM__, getpid());
|
|
return retval;
|
|
}
|