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clixon/apps/netconf/netconf_main.c
Olof hagsand b726c5008e renamed xml_spec_populate*() to xml_bind_yang*()
2020-03-17 16:11:58 +01:00

613 lines
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/*
*
***** BEGIN LICENSE BLOCK *****
Copyright (C) 2009-2016 Olof Hagsand and Benny Holmgren
Copyright (C) 2017-2020 Olof Hagsand
This file is part of CLIXON.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
Alternatively, the contents of this file may be used under the terms of
the GNU General Public License Version 3 or later (the "GPL"),
in which case the provisions of the GPL are applicable instead
of those above. If you wish to allow use of your version of this file only
under the terms of the GPL, and not to allow others to
use your version of this file under the terms of Apache License version 2,
indicate your decision by deleting the provisions above and replace them with
the notice and other provisions required by the GPL. If you do not delete
the provisions above, a recipient may use your version of this file under
the terms of any one of the Apache License version 2 or the GPL.
***** END LICENSE BLOCK *****
*/
#ifdef HAVE_CONFIG_H
#include "clixon_config.h" /* generated by config & autoconf */
#endif
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdarg.h>
#include <errno.h>
#include <signal.h>
#include <fcntl.h>
#include <time.h>
#include <syslog.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <pwd.h>
#include <netinet/in.h>
#include <libgen.h>
/* cligen */
#include <cligen/cligen.h>
/* clicon */
#include <clixon/clixon.h>
#include "clixon_netconf.h"
#include "netconf_lib.h"
#include "netconf_rpc.h"
/* Command line options to be passed to getopt(3) */
#define NETCONF_OPTS "hD:f:l:qa:u:d:p:y:U:t:eo:"
#define NETCONF_LOGFILE "/tmp/clixon_netconf.log"
/*! Ignore errors on packet errors: continue */
static int ignore_packet_errors = 1;
static int
netconf_hello(cxobj *xn)
{
#ifdef nyi
cxobj *x;
x = NULL;
while ((x = xpath_each(xn, "//capability", x)) != NULL) {
}
#endif
return 0;
}
int
netconf_hello_dispatch(cxobj *xn)
{
cxobj *xp;
int retval = -1;
if ((xp = xpath_first(xn, NULL, "//hello")) != NULL)
retval = netconf_hello(xp);
return retval;
}
/*! Process incoming packet
* @param[in] h Clicon handle
* @param[in] cb Packet buffer
*/
static int
netconf_input_packet(clicon_handle h,
cbuf *cb)
{
int retval = -1;
char *str;
char *str0;
cxobj *xreq = NULL; /* Request (in) */
int isrpc = 0; /* either hello or rpc */
cbuf *cbret = NULL;
cxobj *xret = NULL; /* Return (out) */
cxobj *xrpc;
cxobj *xc;
yang_stmt *yspec;
int ret;
cxobj *xa;
cxobj *xa2;
clicon_debug(1, "%s", __FUNCTION__);
clicon_debug(2, "%s: \"%s\"", __FUNCTION__, cbuf_get(cb));
if ((cbret = cbuf_new()) == NULL){
clicon_err(LOG_ERR, errno, "cbuf_new");
goto done;
}
yspec = clicon_dbspec_yang(h);
if ((str0 = strdup(cbuf_get(cb))) == NULL){
clicon_log(LOG_ERR, "%s: strdup: %s", __FUNCTION__, strerror(errno));
return -1;
}
str = str0;
/* Parse incoming XML message */
if (xml_parse_string(str, yspec, &xreq) < 0){
free(str0);
if (netconf_operation_failed(cbret, "rpc", clicon_err_reason)< 0)
goto done;
netconf_output_encap(1, cbret, "rpc-error");
goto done;
}
free(str0);
if ((xrpc=xpath_first(xreq, NULL, "//rpc")) != NULL){
isrpc++;
if (xml_bind_yang_rpc(xrpc, yspec, NULL) < 0)
goto done;
if ((ret = xml_yang_validate_rpc(h, xrpc, &xret)) < 0)
goto done;
if (ret == 0){
clicon_xml2cbuf(cbret, xret, 0, 0, -1);
netconf_output_encap(1, cbret, "rpc-error");
goto ok;
}
}
else
if (xpath_first(xreq, NULL, "//hello") != NULL)
;
else{
clicon_log(LOG_WARNING, "Invalid netconf msg: neither rpc or hello: dropped");
goto done;
}
if (!isrpc){ /* hello */
if (netconf_hello_dispatch(xreq) < 0)
goto done;
}
else /* rpc */
if (netconf_rpc_dispatch(h, xrpc, &xret) < 0){
goto done;
}
else{ /* there is a return message in xret */
if (xret == NULL){
if (netconf_operation_failed(cbret, "rpc", "Internal error: no xml return")< 0)
goto done;
netconf_output_encap(1, cbret, "rpc-error");
goto done;
}
if ((xc = xml_child_i(xret, 0))!=NULL){
xa=NULL;
/* Copy message-id attribute from incoming to reply.
* RFC 6241:
* If additional attributes are present in an <rpc> element, a NETCONF
* peer MUST return them unmodified in the <rpc-reply> element. This
* includes any "xmlns" attributes.
*/
while ((xa = xml_child_each(xrpc, xa, CX_ATTR)) != NULL){
if ((xa2 = xml_dup(xa)) ==NULL)
goto done;
if (xml_addsub(xc, xa2) < 0)
goto done;
}
clicon_xml2cbuf(cbret, xml_child_i(xret,0), 0, 0, -1);
if (netconf_output_encap(1, cbret, "rpc-reply") < 0){
cbuf_free(cbret);
goto done;
}
}
}
ok:
retval = 0;
done:
if (xreq)
xml_free(xreq);
if (xret)
xml_free(xret);
if (cbret)
cbuf_free(cbret);
return retval;
}
/*! Get netconf message: detect end-of-msg
* @param[in] s Socket where input arrived. read from this.
* @param[in] arg Clicon handle.
* This routine continuously reads until no more data on s. There could
* be risk of starvation, but the netconf client does little else than
* read data so I do not see a danger of true starvation here.
*/
static int
netconf_input_cb(int s,
void *arg)
{
int retval = -1;
clicon_handle h = arg;
unsigned char buf[BUFSIZ];
int i;
int len;
cbuf *cb=NULL;
int xml_state = 0;
int poll;
if ((cb = cbuf_new()) == NULL){
clicon_err(OE_XML, errno, "cbuf_new");
return retval;
}
memset(buf, 0, sizeof(buf));
while (1){
if ((len = read(s, buf, sizeof(buf))) < 0){
if (errno == ECONNRESET)
len = 0; /* emulate EOF */
else{
clicon_log(LOG_ERR, "%s: read: %s", __FUNCTION__, strerror(errno));
goto done;
}
} /* read */
if (len == 0){ /* EOF */
cc_closed++;
close(s);
retval = 0;
goto done;
}
for (i=0; i<len; i++){
if (buf[i] == 0)
continue; /* Skip NULL chars (eg from terminals) */
cprintf(cb, "%c", buf[i]);
if (detect_endtag("]]>]]>",
buf[i],
&xml_state)) {
/* OK, we have an xml string from a client */
/* Remove trailer */
*(((char*)cbuf_get(cb)) + cbuf_len(cb) - strlen("]]>]]>")) = '\0';
if (netconf_input_packet(h, cb) < 0 &&
!ignore_packet_errors) // default is to ignore errors
goto done;
if (cc_closed)
break;
cbuf_reset(cb);
}
}
/* poll==1 if more, poll==0 if none */
if ((poll = event_poll(s)) < 0)
goto done;
if (poll == 0)
break; /* No data to read */
} /* while */
retval = 0;
done:
if (cb)
cbuf_free(cb);
if (cc_closed)
retval = -1;
return retval;
}
/*! Send netconf hello message
* @param[in] h Clicon handle
* @param[in] s File descriptor to write on (eg 1 - stdout)
*/
static int
send_hello(clicon_handle h,
int s,
uint32_t id)
{
int retval = -1;
cbuf *cb;
if ((cb = cbuf_new()) == NULL){
clicon_log(LOG_ERR, "%s: cbuf_new", __FUNCTION__);
goto done;
}
if (netconf_hello_server(h, cb, id) < 0)
goto done;
if (netconf_output(s, cb, "hello") < 0)
goto done;
retval = 0;
done:
if (cb)
cbuf_free(cb);
return retval;
}
/*! Clean and close all state of netconf process (but dont exit).
* Cannot use h after this
* @param[in] h Clixon handle
*/
static int
netconf_terminate(clicon_handle h)
{
yang_stmt *yspec;
cvec *nsctx;
cxobj *x;
clixon_plugin_exit(h);
rpc_callback_delete_all(h);
clicon_rpc_close_session(h);
if ((yspec = clicon_dbspec_yang(h)) != NULL)
yspec_free(yspec);
if ((yspec = clicon_config_yang(h)) != NULL)
yspec_free(yspec);
if ((nsctx = clicon_nsctx_global_get(h)) != NULL)
cvec_free(nsctx);
if ((x = clicon_conf_xml(h)) != NULL)
xml_free(x);
xpath_optimize_exit();
event_exit();
clicon_handle_exit(h);
clicon_log_exit();
return 0;
}
static int
timeout_fn(int s,
void *arg)
{
clicon_err(OE_EVENTS, ETIMEDOUT, "User request timeout");
return -1;
}
/*! Usage help routine
* @param[in] h Clicon handle
* @param[in] argv0 command line
*/
static void
usage(clicon_handle h,
char *argv0)
{
fprintf(stderr, "usage:%s\n"
"where options are\n"
"\t-h\t\tHelp\n"
"\t-D <level>\tDebug level\n"
"\t-f <file>\tConfiguration file (mandatory)\n"
"\t-l (e|o|s|f<file>) Log on std(e)rr, std(o)ut, (s)yslog(default), (f)ile\n"
"\t-q\t\tQuiet: dont send hello prompt\n"
"\t-a UNIX|IPv4|IPv6 Internal backend socket family\n"
"\t-u <path|addr>\tInternal socket domain path or IP addr (see -a)\n"
"\t-d <dir>\tSpecify netconf plugin directory dir (default: %s)\n"
"\t-p <dir>\tYang directory path (see CLICON_YANG_DIR)\n"
"\t-y <file>\tLoad yang spec file (override yang main module)\n"
"\t-U <user>\tOver-ride unix user with a pseudo user for NACM.\n"
"\t-t <sec>\tTimeout in seconds. Quit after this time.\n"
"\t-e \t\tDont ignore errors on packet input.\n"
"\t-o \"<option>=<value>\"\tGive configuration option overriding config file (see clixon-config.yang)\n",
argv0,
clicon_netconf_dir(h)
);
exit(0);
}
int
main(int argc,
char **argv)
{
int retval = -1;
int c;
char *argv0 = argv[0];
int quiet = 0;
clicon_handle h;
char *dir;
int logdst = CLICON_LOG_STDERR;
struct passwd *pw;
struct timeval tv = {0,}; /* timeout */
yang_stmt *yspec = NULL;
char *str;
uint32_t id;
cvec *nsctx_global = NULL; /* Global namespace context */
size_t cligen_buflen;
size_t cligen_bufthreshold;
/* Create handle */
if ((h = clicon_handle_init()) == NULL)
return -1;
/* In the startup, logs to stderr & debug flag set later */
clicon_log_init(__PROGRAM__, LOG_INFO, logdst);
/* Set username to clicon handle. Use in all communication to backend */
if ((pw = getpwuid(getuid())) == NULL){
clicon_err(OE_UNIX, errno, "getpwuid");
goto done;
}
if (clicon_username_set(h, pw->pw_name) < 0)
goto done;
while ((c = getopt(argc, argv, NETCONF_OPTS)) != -1)
switch (c) {
case 'h' : /* help */
usage(h, argv[0]);
break;
case 'D' : /* debug */
if (sscanf(optarg, "%d", &debug) != 1)
usage(h, argv[0]);
break;
case 'f': /* override config file */
if (!strlen(optarg))
usage(h, argv[0]);
clicon_option_str_set(h, "CLICON_CONFIGFILE", optarg);
break;
case 'l': /* Log destination: s|e|o */
if ((logdst = clicon_log_opt(optarg[0])) < 0)
usage(h, argv[0]);
if (logdst == CLICON_LOG_FILE &&
strlen(optarg)>1 &&
clicon_log_file(optarg+1) < 0)
goto done;
break;
}
/*
* Logs, error and debug to stderr or syslog, set debug level
*/
clicon_log_init(__PROGRAM__, debug?LOG_DEBUG:LOG_INFO, logdst);
clicon_debug_init(debug, NULL);
/* Find, read and parse configfile */
if (clicon_options_main(h) < 0)
return -1;
/* Now rest of options */
optind = 1;
opterr = 0;
while ((c = getopt(argc, argv, NETCONF_OPTS)) != -1)
switch (c) {
case 'h' : /* help */
case 'D' : /* debug */
case 'f': /* config file */
case 'l': /* log */
break; /* see above */
case 'q': /* quiet: dont write hello */
quiet++;
break;
case 'a': /* internal backend socket address family */
clicon_option_str_set(h, "CLICON_SOCK_FAMILY", optarg);
break;
case 'u': /* internal backend socket unix domain path or ip host */
if (!strlen(optarg))
usage(h, argv[0]);
clicon_option_str_set(h, "CLICON_SOCK", optarg);
break;
case 'd': /* Plugin directory */
if (!strlen(optarg))
usage(h, argv[0]);
if (clicon_option_add(h, "CLICON_NETCONF_DIR", optarg) < 0)
goto done;
break;
case 'p' : /* yang dir path */
if (clicon_option_add(h, "CLICON_YANG_DIR", optarg) < 0)
goto done;
break;
case 'y' : /* Load yang spec file (override yang main module) */
if (clicon_option_add(h, "CLICON_YANG_MAIN_FILE", optarg) < 0)
goto done;
break;
case 'U': /* Clixon 'pseudo' user */
if (!strlen(optarg))
usage(h, argv[0]);
if (clicon_username_set(h, optarg) < 0)
goto done;
break;
case 't': /* timeout in seconds */
tv.tv_sec = atoi(optarg);
break;
case 'e': /* dont ignore packet errors */
ignore_packet_errors = 0;
break;
case 'o':{ /* Configuration option */
char *val;
if ((val = index(optarg, '=')) == NULL)
usage(h, argv0);
*val++ = '\0';
if (clicon_option_add(h, optarg, val) < 0)
goto done;
break;
}
default:
usage(h, argv[0]);
break;
}
argc -= optind;
argv += optind;
/* Access the remaining argv/argc options (after --) w clicon-argv_get() */
clicon_argv_set(h, argv0, argc, argv);
/* Init cligen buffers */
cligen_buflen = clicon_option_int(h, "CLICON_CLI_BUF_START");
cligen_bufthreshold = clicon_option_int(h, "CLICON_CLI_BUF_THRESHOLD");
cbuf_alloc_set(cligen_buflen, cligen_bufthreshold);
/* Add (hardcoded) netconf features in case ietf-netconf loaded here
* Otherwise it is loaded in netconf_module_load below
*/
if (netconf_module_features(h) < 0)
goto done;
/* Create top-level yang spec and store as option */
if ((yspec = yspec_new()) == NULL)
goto done;
clicon_dbspec_yang_set(h, yspec);
/* Load netconf plugins before yangs are loaded (eg extension callbacks) */
if ((dir = clicon_netconf_dir(h)) != NULL &&
clixon_plugins_load(h, CLIXON_PLUGIN_INIT, dir, NULL) < 0)
goto done;
/* Load Yang modules
* 1. Load a yang module as a specific absolute filename */
if ((str = clicon_yang_main_file(h)) != NULL){
if (yang_spec_parse_file(h, str, yspec) < 0)
goto done;
}
/* 2. Load a (single) main module */
if ((str = clicon_yang_module_main(h)) != NULL){
if (yang_spec_parse_module(h, str, clicon_yang_module_revision(h),
yspec) < 0)
goto done;
}
/* 3. Load all modules in a directory */
if ((str = clicon_yang_main_dir(h)) != NULL){
if (yang_spec_load_dir(h, str, yspec) < 0)
goto done;
}
/* Load clixon lib yang module */
if (yang_spec_parse_module(h, "clixon-lib", NULL, yspec) < 0)
goto done;
/* Load yang module library, RFC7895 */
if (yang_modules_init(h) < 0)
goto done;
/* Add netconf yang spec, used by netconf client and as internal protocol */
if (netconf_module_load(h) < 0)
goto done;
/* Here all modules are loaded
* Compute and set canonical namespace context
*/
if (xml_nsctx_yangspec(yspec, &nsctx_global) < 0)
goto done;
if (clicon_nsctx_global_set(h, nsctx_global) < 0)
goto done;
/* Call start function is all plugins before we go interactive */
if (clixon_plugin_start(h) < 0)
goto done;
#if 1
/* XXX get session id from backend hello */
clicon_session_id_set(h, getpid());
#endif
/* Send hello request to backend to get session-id back
* This is done once at the beginning of the session and then this is
* used by the client, even though new TCP sessions are created for
* each message sent to the backend.
*/
if (clicon_hello_req(h, &id) < 0)
goto done;
clicon_session_id_set(h, id);
/* Send hello to northbound client */
if (!quiet)
send_hello(h, 1, id);
if (event_reg_fd(0, netconf_input_cb, h, "netconf socket") < 0)
goto done;
if (debug)
clicon_option_dump(h, debug);
if (tv.tv_sec || tv.tv_usec){
struct timeval t;
gettimeofday(&t, NULL);
timeradd(&t, &tv, &t);
if (event_reg_timeout(t, timeout_fn, NULL, "timeout") < 0)
goto done;
}
if (event_loop() < 0)
goto done;
retval = 0;
done:
if (ignore_packet_errors)
retval = 0;
netconf_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;
}
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