Initial Net-snmp frontend commit
Added apps/snmp with makefiles, autotools, docker adjustment Minimal snmp_main program
This commit is contained in:
Olof hagsand
parent
a00e36caa2
commit
d72aa58f90
9 changed files with 591 additions and 11 deletions
327
apps/snmp/snmp_main.c
Normal file
327
apps/snmp/snmp_main.c
Normal file
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@ -0,0 +1,327 @@
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/*
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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 <sys/types.h>
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#include <net-snmp/net-snmp-config.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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/* Command line options to be passed to getopt(3) */
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#define SNMP_OPTS "hD:f:l:o:"
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/*! XXX netsnmp API goes here
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*/
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static int
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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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retval = 0;
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// done:
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return retval;
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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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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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return 0;
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}
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/*! Setup signal handlers
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*/
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static int
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snmp_signal_init (clicon_handle h)
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{
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int retval = -1;
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if (set_signal(SIGPIPE, SIG_IGN, NULL) < 0){
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clicon_err(OE_UNIX, errno, "Setting DIGPIPE signal");
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goto done;
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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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/*! 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-o \"<option>=<value>\"\tGive configuration option overriding config file (see clixon-config.yang)\n",
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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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/* 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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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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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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/* 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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/* Setup signal handlers, int particular PIPE that occurs if backend closes / restarts */
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if (snmp_signal_init(h) < 0)
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goto done;
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/* In case ietf-yang-metadata is loaded by application, handle annotation extension */
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if (0 && yang_metadata_init(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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/* Call start function is all plugins before we go interactive */
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if (clixon_plugin_start_all(h) < 0)
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goto done;
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#if 1
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/* XXX get session id from backend hello */
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clicon_session_id_set(h, getpid());
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#endif
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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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/* XXX Here should register an net-snmp interface socket
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* But it registers stdin which is wrong
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*/
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if (clixon_event_reg_fd(0, snmp_input_cb, h, "snmp socket") < 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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if (clixon_event_loop(h) < 0)
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goto done;
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retval = 0;
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done:
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snmp_terminate(h);
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clicon_log_init(__PROGRAM__, LOG_INFO, 0); /* Log on syslog no stderr */
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clicon_log(LOG_NOTICE, "%s: %u Terminated", __PROGRAM__, getpid());
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return retval;
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}
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