/*
* snmpd.c
*/
/** @defgroup agent The Net-SNMP agent
* The snmp agent responds to SNMP queries from management stations
*/
/* Portions of this file are subject to the following copyrights. See
* the Net-SNMP's COPYING file for more details and other copyrights
* that may apply:
*/
/*
* Copyright 1988, 1989 by Carnegie Mellon University
*
* All Rights Reserved
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appear in all copies and that
* both that copyright notice and this permission notice appear in
* supporting documentation, and that the name of CMU not be
* used in advertising or publicity pertaining to distribution of the
* software without specific, written prior permission.
*
* CMU DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
* ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
* CMU BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
* ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
* WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
* ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
* *****************************************************************
*/
/*
* Copyright © 2003 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms specified in the COPYING file
* distributed with the Net-SNMP package.
*/
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-features.h>
#include <net-snmp/types.h>
#if HAVE_IO_H
#include <io.h>
#endif
#include <stdio.h>
#include <errno.h>
#if HAVE_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif
#if HAVE_STDLIB_H
#include <stdlib.h>
#endif
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <sys/types.h>
#if HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#if HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
#if HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#if HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#if HAVE_NET_IF_H
#include <net/if.h>
#endif
#if HAVE_INET_MIB2_H
#include <inet/mib2.h>
#endif
#if HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif
#if HAVE_SYS_FILE_H
#include <sys/file.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#if HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#include <signal.h>
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#if HAVE_PROCESS_H /* Win32-getpid */
#include <process.h>
#endif
#if HAVE_LIMITS_H
#include <limits.h>
#endif
#if HAVE_PWD_H
#include <pwd.h>
#endif
#if HAVE_GRP_H
#include <grp.h>
#endif
#ifdef HAVE_CRTDBG_H
#include <crtdbg.h>
#endif
#ifndef PATH_MAX
# ifdef _POSIX_PATH_MAX
# define PATH_MAX _POSIX_PATH_MAX
# else
# define PATH_MAX 255
# endif
#endif
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>
#include "agent_global_vars.h"
#include <net-snmp/library/fd_event_manager.h>
#include <net-snmp/library/large_fd_set.h>
#include "m2m.h"
#include <net-snmp/agent/agent_module_config.h>
#include <net-snmp/agent/mib_module_config.h>
#include "snmpd.h"
#include <net-snmp/agent/mib_modules.h>
#include <net-snmp/agent/agent_trap.h>
#include <net-snmp/agent/netsnmp_close_fds.h>
#include <net-snmp/agent/table.h>
#include <net-snmp/agent/table_iterator.h>
#include "mibgroup/util_funcs/restart.h"
/*
* Include winservice.h to support Windows Service
*/
#ifdef WIN32
#include <windows.h>
#include <tchar.h>
#include <net-snmp/library/winservice.h>
#define WIN32SERVICE
#endif
#ifndef NETSNMP_NO_SYSTEMD
#include <net-snmp/library/sd-daemon.h>
#endif
netsnmp_feature_want(logging_file)
netsnmp_feature_want(logging_stdio)
netsnmp_feature_want(logging_syslog)
/*
* Globals.
*/
#ifdef NETSNMP_USE_LIBWRAP
#include <tcpd.h>
#endif /* NETSNMP_USE_LIBWRAP */
#define TIMETICK 500000L
int snmp_dump_packet;
static int reconfig = 0;
int Facility = LOG_DAEMON;
#ifdef WIN32SERVICE
/*
* SNMP Agent Status
*/
#define AGENT_RUNNING 1
#define AGENT_STOPPED 0
int agent_status = AGENT_STOPPED;
/* app_name_long used for Event Log (syslog), SCM, registry etc */
LPCTSTR app_name_long = _T("Net-SNMP Agent"); /* Application Name */
#endif
const char *app_name = "snmpd";
#ifdef USING_SMUX_MODULE
#include <mibgroup/smux/smux.h>
#endif /* USING_SMUX_MODULE */
/*
* Prototypes.
*/
static void usage(char *);
static void SnmpTrapNodeDown(void);
static int receive(void);
#ifdef WIN32SERVICE
static void StopSnmpAgent(void);
#endif
/*
* These definitions handle 4.2 systems without additional syslog facilities.
*/
#ifndef LOG_CONS
#define LOG_CONS 0 /* Don't bother if not defined... */
#endif
#ifndef LOG_PID
#define LOG_PID 0 /* Don't bother if not defined... */
#endif
#ifndef LOG_LOCAL0
#define LOG_LOCAL0 0
#endif
#ifndef LOG_LOCAL1
#define LOG_LOCAL1 0
#endif
#ifndef LOG_LOCAL2
#define LOG_LOCAL2 0
#endif
#ifndef LOG_LOCAL3
#define LOG_LOCAL3 0
#endif
#ifndef LOG_LOCAL4
#define LOG_LOCAL4 0
#endif
#ifndef LOG_LOCAL5
#define LOG_LOCAL5 0
#endif
#ifndef LOG_LOCAL6
#define LOG_LOCAL6 0
#endif
#ifndef LOG_LOCAL7
#define LOG_LOCAL7 0
#endif
#ifndef LOG_DAEMON
#define LOG_DAEMON 0
#endif
static void
usage(char *prog)
{
#ifdef WIN32SERVICE
printf("\nUsage: %s [-register] [-quiet] [OPTIONS] [LISTENING ADDRESSES]"
"\n %s [-unregister] [-quiet]", prog, prog);
#else
printf("\nUsage: %s [OPTIONS] [LISTENING ADDRESSES]", prog);
#endif
printf("\n"
"\n\tVersion: %s\n%s"
"\t\t\t (config search path: %s)\n%s%s",
netsnmp_get_version(),
"\tWeb: http://www.net-snmp.org/\n"
"\tEmail: net-snmp-coders@lists.sourceforge.net\n"
"\n -a\t\t\tlog addresses\n"
" -A\t\t\tappend to the logfile rather than truncating it\n"
" -c FILE[,...]\t\tread FILE(s) as configuration file(s)\n"
" -C\t\t\tdo not read the default configuration files\n",
get_configuration_directory(),
" -d\t\t\tdump sent and received SNMP packets\n"
#ifndef NETSNMP_DISABLE_DEBUGGING
" -D[TOKEN[,...]]\tturn on debugging output for the given TOKEN(s)\n"
"\t\t\t (try ALL for extremely verbose output)\n"
"\t\t\t Don't put space(s) between -D and TOKEN(s).\n"
#endif
" -f\t\t\tdo not fork from the shell\n",
#if HAVE_UNISTD_H
" -g GID\t\tchange to this numeric gid after opening\n"
"\t\t\t transport endpoints\n"
#endif
" -h, --help\t\tdisplay this usage message\n"
" -H\t\t\tdisplay configuration file directives understood\n"
" -I [-]INITLIST\tlist of mib modules to initialize (or not)\n"
"\t\t\t (run snmpd with -Dmib_init for a list)\n"
" -L <LOGOPTS>\t\ttoggle options controlling where to log to\n");
snmp_log_options_usage("\t", stdout);
printf(" -m MIBLIST\t\tuse MIBLIST instead of the default MIB list\n"
" -M DIRLIST\t\tuse DIRLIST as the list of locations to look for MIBs\n"
"\t\t\t (default %s)\n%s%s",
#ifndef NETSNMP_DISABLE_MIB_LOADING
netsnmp_get_mib_directory(),
#else
"MIBs not loaded",
#endif
" -p FILE\t\tstore process id in FILE\n"
" -q\t\t\tprint information in a more parsable format\n"
" -r\t\t\tdo not exit if files only accessible to root\n"
"\t\t\t cannot be opened\n"
#ifdef WIN32SERVICE
" -register\t\tregister as a Windows service\n"
" \t\t\t (followed by -quiet to prevent message popups)\n"
" \t\t\t (followed by the startup parameter list)\n"
" \t\t\t Note that some parameters are not relevant when running as a service\n"
#endif
#if HAVE_UNISTD_H
" -u UID\t\tchange to this uid (numeric or textual) after\n"
"\t\t\t opening transport endpoints\n"
#endif
#ifdef WIN32SERVICE
" -unregister\t\tunregister as a Windows service\n"
" \t\t\t (followed -quiet to prevent message popups)\n"
#endif
" -v, --version\t\tdisplay version information\n"
" -V\t\t\tverbose display\n"
#if defined(USING_AGENTX_SUBAGENT_MODULE)|| defined(USING_AGENTX_MASTER_MODULE)
" -x ADDRESS\t\tuse ADDRESS as AgentX address\n"
#endif
#ifdef USING_AGENTX_SUBAGENT_MODULE
" -X\t\t\trun as an AgentX subagent rather than as an\n"
"\t\t\t SNMP master agent\n"
#endif
,
"\nDeprecated options:\n"
" -l FILE\t\tuse -Lf <FILE> instead\n"
" -P\t\t\tuse -p instead\n"
" -s\t\t\tuse -Lsd instead\n"
" -S d|i|0-7\t\tuse -Ls <facility> instead\n"
"\n"
);
exit(1);
}
static void
version(void)
{
printf("\nNET-SNMP version: %s\n"
"Web: http://www.net-snmp.org/\n"
"Email: net-snmp-coders@lists.sourceforge.net\n\n",
netsnmp_get_version());
}
RETSIGTYPE
SnmpdShutDown(int a)
{
netsnmp_running = 0;
#ifdef WIN32SERVICE
/*
* In case of windows, select() in receive() function will not return
* on signal. Thats why following function is called, which closes the
* socket descriptors and causes the select() to return
*/
snmp_close(main_session);
#endif
}
#ifdef SIGHUP
RETSIGTYPE
SnmpdReconfig(int a)
{
reconfig = 1;
signal(SIGHUP, SnmpdReconfig);
}
#endif
#ifdef SIGUSR1
RETSIGTYPE
SnmpdDump(int a)
{
dump_registry();
signal(SIGUSR1, SnmpdDump);
}
#endif
RETSIGTYPE
SnmpdCatchRandomSignal(int a)
{
/* Disable all logs and log the error via syslog */
snmp_disable_log();
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG
snmp_enable_syslog();
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG */
snmp_log(LOG_ERR, "Exiting on signal %d\n", a);
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG
snmp_disable_syslog();
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG */
exit(1);
}
static void
SnmpTrapNodeDown(void)
{
send_easy_trap(SNMP_TRAP_ENTERPRISESPECIFIC, 2);
/*
* XXX 2 - Node Down #define it as NODE_DOWN_TRAP
*/
}
/*******************************************************************-o-******
* main - Non Windows
* SnmpDaemonMain - Windows to support windows service
*
* Parameters:
* argc
* *argv[]
*
* Returns:
* 0 Always succeeds. (?)
*
*
* Setup and start the agent daemon.
*
* Also successfully EXITs with zero for some options.
*/
#ifdef WIN32SERVICE
static int
SnmpDaemonMain(int argc, TCHAR * argv[])
#else
int
main(int argc, char *argv[])
#endif
{
static const char options[] = "aAc:CdD::fhHI:l:L:m:M:n:p:P:qrsS:UvV-:Y:"
#if HAVE_UNISTD_H
"g:u:"
#endif
#if defined(USING_AGENTX_SUBAGENT_MODULE)|| defined(USING_AGENTX_MASTER_MODULE)
"x:"
#endif
#ifdef USING_AGENTX_SUBAGENT_MODULE
"X"
#endif
;
int arg, i, ret, exit_code = 1;
int dont_fork = 0, do_help = 0;
int log_set = 0;
int agent_mode = -1;
char *pid_file = NULL;
char option_compatability[] = "-Le";
#ifndef WIN32
int prepared_sockets = 0;
#endif
#if HAVE_GETPID
int fd;
FILE *PID;
#endif
SOCK_STARTUP;
#ifndef NETSNMP_NO_SYSTEMD
/* check if systemd has sockets for us and don't close them */
prepared_sockets = netsnmp_sd_listen_fds(0);
#endif /* NETSNMP_NO_SYSTEMD */
#ifndef WIN32
/*
* close all non-standard file descriptors we may have
* inherited from the shell.
*/
if (!prepared_sockets)
netsnmp_close_fds(2);
#endif
/*
* register signals ASAP to prevent default action (usually core)
* for signals during startup...
*/
#ifdef SIGTERM
DEBUGMSGTL(("signal", "registering SIGTERM signal handler\n"));
signal(SIGTERM, SnmpdShutDown);
#endif
#ifdef SIGINT
DEBUGMSGTL(("signal", "registering SIGINT signal handler\n"));
signal(SIGINT, SnmpdShutDown);
#endif
#ifdef SIGHUP
signal(SIGHUP, SIG_IGN); /* do not terminate on early SIGHUP */
#endif
#ifdef SIGUSR1
DEBUGMSGTL(("signal", "registering SIGUSR1 signal handler\n"));
signal(SIGUSR1, SnmpdDump);
#endif
#ifdef SIGPIPE
DEBUGMSGTL(("signal", "registering SIGPIPE signal handler\n"));
signal(SIGPIPE, SIG_IGN); /* 'Inline' failure of wayward readers */
#endif
#ifdef SIGXFSZ
signal(SIGXFSZ, SnmpdCatchRandomSignal);
#endif
#ifdef NETSNMP_NO_ROOT_ACCESS
/*
* Default to no.
*/
netsnmp_ds_set_boolean(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_NO_ROOT_ACCESS, 1);
#endif
/*
* Default to NOT running an AgentX master.
*/
netsnmp_ds_set_boolean(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_AGENTX_MASTER, 0);
netsnmp_ds_set_int(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_AGENTX_TIMEOUT, -1);
netsnmp_ds_set_int(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_AGENTX_RETRIES, -1);
netsnmp_ds_set_int(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_CACHE_TIMEOUT, 5);
/*
* This is incredibly ugly, but it's probably the simplest way
* to handle the old '-L' option as well as the new '-Lx' style
*/
for (i=0; i<argc; i++) {
if (!strcmp(argv[i], "-L"))
argv[i] = option_compatability;
}
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG
#ifdef WIN32
snmp_log_syslogname(app_name_long);
#else
snmp_log_syslogname(app_name);
#endif
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG */
netsnmp_ds_set_string(NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_APPTYPE, app_name);
/*
* Now process options normally.
*/
while ((arg = getopt(argc, argv, options)) != EOF) {
switch (arg) {
case '-':
if (strcasecmp(optarg, "help") == 0) {
usage(argv[0]);
goto out;
}
if (strcasecmp(optarg, "version") == 0) {
version();
exit_code = 0;
goto out;
}
handle_long_opt(optarg);
break;
case 'a':
log_addresses++;
break;
case 'A':
netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_APPEND_LOGFILES, 1);
break;
case 'c':
if (optarg != NULL) {
netsnmp_ds_set_string(NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_OPTIONALCONFIG, optarg);
} else {
usage(argv[0]);
}
break;
case 'C':
netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_DONT_READ_CONFIGS, 1);
break;
case 'd':
netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_DUMP_PACKET,
++snmp_dump_packet);
break;
case 'D':
#ifdef NETSNMP_DISABLE_DEBUGGING
fprintf(stderr, "Debugging not configured\n");
goto out;
#else
debug_register_tokens(optarg);
snmp_set_do_debugging(1);
#endif
break;
case 'f':
dont_fork = 1;
break;
#if HAVE_UNISTD_H
case 'g':
if (optarg != NULL) {
char *ecp;
int gid;
gid = strtoul(optarg, &ecp, 10);
#if HAVE_GETGRNAM && HAVE_PWD_H
if (*ecp) {
struct group *info;
info = getgrnam(optarg);
gid = info ? info->gr_gid : -1;
endgrent();
}
#endif
if (gid < 0) {
fprintf(stderr, "Bad group id: %s\n", optarg);
goto out;
}
netsnmp_ds_set_int(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_GROUPID, gid);
} else {
usage(argv[0]);
}
break;
#endif
case 'h':
usage(argv[0]);
break;
case 'H':
do_help = 1;
break;
case 'I':
if (optarg != NULL) {
add_to_init_list(optarg);
} else {
usage(argv[0]);
}
break;
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_FILE
case 'l':
printf("Warning: -l option is deprecated, use -Lf <file> instead\n");
if (optarg != NULL) {
if (strlen(optarg) > PATH_MAX) {
fprintf(stderr,
"%s: logfile path too long (limit %d chars)\n",
argv[0], PATH_MAX);
goto out;
}
snmp_enable_filelog(optarg,
netsnmp_ds_get_boolean(NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_APPEND_LOGFILES));
log_set = 1;
} else {
usage(argv[0]);
}
break;
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_FILE */
case 'L':
if (snmp_log_options( optarg, argc, argv ) < 0 ) {
usage(argv[0]);
}
log_set = 1;
break;
case 'm':
if (optarg != NULL) {
setenv("MIBS", optarg, 1);
} else {
usage(argv[0]);
}
break;
case 'M':
if (optarg != NULL) {
setenv("MIBDIRS", optarg, 1);
} else {
usage(argv[0]);
}
break;
case 'n':
if (optarg != NULL) {
app_name = optarg;
netsnmp_ds_set_string(NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_APPTYPE, app_name);
} else {
usage(argv[0]);
}
break;
case 'P':
printf("Warning: -P option is deprecated, use -p instead\n");
/* FALL THROUGH */
case 'p':
if (optarg != NULL) {
pid_file = optarg;
} else {
usage(argv[0]);
}
break;
case 'q':
netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_QUICK_PRINT, 1);
break;
case 'r':
netsnmp_ds_toggle_boolean(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_NO_ROOT_ACCESS);
break;
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG
case 's':
printf("Warning: -s option is deprecated, use -Lsd instead\n");
snmp_enable_syslog();
log_set = 1;
break;
case 'S':
printf("Warning: -S option is deprecated, use -Ls <facility> instead\n");
if (optarg != NULL) {
switch (*optarg) {
case 'd':
case 'D':
Facility = LOG_DAEMON;
break;
case 'i':
case 'I':
Facility = LOG_INFO;
break;
case '0':
Facility = LOG_LOCAL0;
break;
case '1':
Facility = LOG_LOCAL1;
break;
case '2':
Facility = LOG_LOCAL2;
break;
case '3':
Facility = LOG_LOCAL3;
break;
case '4':
Facility = LOG_LOCAL4;
break;
case '5':
Facility = LOG_LOCAL5;
break;
case '6':
Facility = LOG_LOCAL6;
break;
case '7':
Facility = LOG_LOCAL7;
break;
default:
fprintf(stderr, "invalid syslog facility: -S%c\n",*optarg);
usage(argv[0]);
}
snmp_enable_syslog_ident(snmp_log_syslogname(NULL), Facility);
log_set = 1;
} else {
fprintf(stderr, "no syslog facility specified\n");
usage(argv[0]);
}
break;
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG */
case 'U':
netsnmp_ds_toggle_boolean(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_LEAVE_PIDFILE);
break;
#if HAVE_UNISTD_H
case 'u':
if (optarg != NULL) {
char *ecp;
int uid;
uid = strtoul(optarg, &ecp, 10);
#if HAVE_GETPWNAM && HAVE_PWD_H
if (*ecp) {
struct passwd *info;
info = getpwnam(optarg);
uid = info ? info->pw_uid : -1;
endpwent();
}
#endif
if (uid < 0) {
fprintf(stderr, "Bad user id: %s\n", optarg);
goto out;
}
netsnmp_ds_set_int(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_USERID, uid);
} else {
usage(argv[0]);
}
break;
#endif
case 'v':
version();
exit_code = 0;
goto out;
case 'V':
netsnmp_ds_set_boolean(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_VERBOSE, 1);
break;
#if defined(USING_AGENTX_SUBAGENT_MODULE)|| defined(USING_AGENTX_MASTER_MODULE)
case 'x':
if (optarg != NULL) {
netsnmp_ds_set_string(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_X_SOCKET, optarg);
} else {
usage(argv[0]);
}
netsnmp_ds_set_boolean(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_AGENTX_MASTER, 1);
break;
#endif
case 'X':
#if defined(USING_AGENTX_SUBAGENT_MODULE)
agent_mode = SUB_AGENT;
#else
fprintf(stderr, "%s: Illegal argument -X:"
"AgentX support not compiled in.\n", argv[0]);
usage(argv[0]);
goto out;
#endif
break;
case 'Y':
netsnmp_config_remember(optarg);
break;
default:
usage(argv[0]);
break;
}
}
if (do_help) {
netsnmp_ds_set_boolean(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_NO_ROOT_ACCESS, 1);
init_agent(app_name); /* register our .conf handlers */
init_mib_modules();
init_snmp(app_name);
fprintf(stderr, "Configuration directives understood:\n");
read_config_print_usage(" ");
exit_code = 0;
goto out;
}
if (optind < argc) {
#ifndef NETSNMP_NO_LISTEN_SUPPORT
/*
* There are optional transport addresses on the command line.
*/
DEBUGMSGTL(("snmpd/main", "optind %d, argc %d\n", optind, argc));
for (i = optind; i < argc; i++) {
char *c, *astring;
if ((c = netsnmp_ds_get_string(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_PORTS))) {
astring = (char*)malloc(strlen(c) + 2 + strlen(argv[i]));
if (astring == NULL) {
fprintf(stderr, "malloc failure processing argv[%d]\n", i);
goto out;
}
sprintf(astring, "%s,%s", c, argv[i]);
netsnmp_ds_set_string(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_PORTS, astring);
SNMP_FREE(astring);
} else {
netsnmp_ds_set_string(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_PORTS, argv[i]);
}
}
DEBUGMSGTL(("snmpd/main", "port spec: %s\n",
netsnmp_ds_get_string(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_PORTS)));
#else /* NETSNMP_NO_LISTEN_SUPPORT */
fprintf(stderr, "You specified ports to open; this agent was built to only send notifications\n");
goto out;
#endif /* NETSNMP_NO_LISTEN_SUPPORT */
}
#if defined(NETSNMP_DAEMONS_DEFAULT_LOG_SYSLOG)
if (0 == log_set)
snmp_enable_syslog();
#else
#ifdef NETSNMP_LOGFILE
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_FILE
if (0 == log_set)
snmp_enable_filelog(NETSNMP_LOGFILE,
netsnmp_ds_get_boolean(NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_APPEND_LOGFILES));
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_FILE */
#endif /* NETSNMP_LOGFILE */
#endif /* ! NETSNMP_DEFAULT_LOG_SYSLOG */
#ifdef USING_UTIL_FUNCS_RESTART_MODULE
{
/*
* Initialize a argv set to the current for restarting the agent.
*/
char *cptr, **argvptr;
argvrestartp = (char **)malloc((argc + 2) * sizeof(char *));
argvptr = argvrestartp;
for (i = 0, ret = 1; i < argc; i++) {
ret += strlen(argv[i]) + 1;
}
argvrestart = (char *) malloc(ret);
argvrestartname = (char *) malloc(strlen(argv[0]) + 1);
if (!argvrestartp || !argvrestart || !argvrestartname) {
fprintf(stderr, "malloc failure processing argvrestart\n");
goto out;
}
strcpy(argvrestartname, argv[0]);
for (cptr = argvrestart, i = 0; i < argc; i++) {
strcpy(cptr, argv[i]);
*(argvptr++) = cptr;
cptr += strlen(argv[i]) + 1;
}
}
#endif /* USING_UTIL_FUNCS_RESTART_MODULE */
if (agent_mode == -1) {
if (strstr(argv[0], "agentxd") != NULL) {
netsnmp_ds_set_boolean(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_ROLE, SUB_AGENT);
} else {
netsnmp_ds_set_boolean(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_ROLE, MASTER_AGENT);
}
} else {
netsnmp_ds_set_boolean(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_ROLE, agent_mode);
}
if (init_agent(app_name) != 0) {
snmp_log(LOG_ERR, "Agent initialization failed\n");
goto out;
}
init_mib_modules();
/*
* start library
*/
init_snmp(app_name);
if ((ret = init_master_agent()) != 0) {
/*
* Some error opening one of the specified agent transports.
*/
snmp_log(LOG_ERR, "Server Exiting with code 1\n");
goto out;
}
/*
* Initialize the world. Detach from the shell. Create initial user.
*/
if(!dont_fork) {
int quit = ! netsnmp_ds_get_boolean(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_QUIT_IMMEDIATELY);
ret = netsnmp_daemonize(quit,
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_STDIO
snmp_stderrlog_status()
#else /* NETSNMP_FEATURE_REMOVE_LOGGING_STDIO */
0
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_STDIO */
);
/*
* xxx-rks: do we care if fork fails? I think we should...
*/
if(ret != 0) {
snmp_log(LOG_ERR, "Server Exiting with code 1\n");
goto out;
}
}
#if HAVE_GETPID
if (pid_file != NULL) {
/*
* unlink the pid_file, if it exists, prior to open. Without
* doing this the open will fail if the user specified pid_file
* already exists.
*/
unlink(pid_file);
fd = open(pid_file, O_CREAT | O_EXCL | O_WRONLY, 0600);
if (fd == -1) {
snmp_log_perror(pid_file);
if (!netsnmp_ds_get_boolean(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_NO_ROOT_ACCESS)) {
goto out;
}
} else {
if ((PID = fdopen(fd, "w")) == NULL) {
snmp_log_perror(pid_file);
goto out;
} else {
fprintf(PID, "%d\n", (int) getpid());
fclose(PID);
}
#ifndef _MSC_VER
/* The sequence open()/fdopen()/fclose()/close() makes MSVC crash,
hence skip the close() call when using the MSVC runtime. */
close(fd);
#endif
}
}
#endif
#if defined(HAVE_UNISTD_H) && (defined(HAVE_CHOWN) || defined(HAVE_SETGID) || defined(HAVE_SETUID))
{
const char *persistent_dir;
int uid, gid;
persistent_dir = get_persistent_directory();
mkdirhier( persistent_dir, NETSNMP_AGENT_DIRECTORY_MODE, 0 );
uid = netsnmp_ds_get_int(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_USERID);
gid = netsnmp_ds_get_int(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_GROUPID);
#ifdef HAVE_CHOWN
if ( uid != 0 || gid != 0 )
chown( persistent_dir, uid, gid );
#endif
#ifdef HAVE_SETGID
if ((gid = netsnmp_ds_get_int(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_GROUPID)) > 0) {
DEBUGMSGTL(("snmpd/main", "Changing gid to %d.\n", gid));
if (setgid(gid) == -1
#ifdef HAVE_SETGROUPS
|| setgroups(1, (gid_t *)&gid) == -1
#endif
) {
snmp_log_perror("setgid failed");
if (!netsnmp_ds_get_boolean(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_NO_ROOT_ACCESS)) {
goto out;
}
}
}
#endif
#ifdef HAVE_SETUID
if ((uid = netsnmp_ds_get_int(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_USERID)) > 0) {
#if HAVE_GETPWNAM && HAVE_PWD_H && HAVE_INITGROUPS
struct passwd *info;
/*
* Set supplementary groups before changing UID
* (which probably involves giving up privileges)
*/
info = getpwuid(uid);
if (info) {
DEBUGMSGTL(("snmpd/main", "Supplementary groups for %s.\n", info->pw_name));
if (initgroups(info->pw_name, (gid != 0 ? (gid_t)gid : info->pw_gid)) == -1) {
snmp_log_perror("initgroups failed");
if (!netsnmp_ds_get_boolean(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_NO_ROOT_ACCESS)) {
goto out;
}
}
}
endpwent();
#endif
DEBUGMSGTL(("snmpd/main", "Changing uid to %d.\n", uid));
if (setuid(uid) == -1) {
snmp_log_perror("setuid failed");
if (!netsnmp_ds_get_boolean(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_NO_ROOT_ACCESS)) {
goto out;
}
}
}
#endif
}
#endif
/*
* Store persistent data immediately in case we crash later.
*/
snmp_store(app_name);
#ifdef SIGHUP
DEBUGMSGTL(("signal", "registering SIGHUP signal handler\n"));
signal(SIGHUP, SnmpdReconfig);
#endif
/*
* Send coldstart trap if possible.
*/
send_easy_trap(0, 0);
/*
* We're up, log our version number.
*/
snmp_log(LOG_INFO, "NET-SNMP version %s\n", netsnmp_get_version());
#ifdef WIN32SERVICE
agent_status = AGENT_RUNNING;
#endif
netsnmp_addrcache_initialise();
/*
* Let systemd know we're up.
*/
#ifndef NETSNMP_NO_SYSTEMD
netsnmp_sd_notify(1, "READY=1\n");
if (prepared_sockets)
/*
* Clear the environment variable, we already processed all the sockets
* by now.
*/
netsnmp_sd_listen_fds(1);
#endif
/*
* Forever monitor the dest_port for incoming PDUs.
*/
DEBUGMSGTL(("snmpd/main", "We're up. Starting to process data.\n"));
if (!netsnmp_ds_get_boolean(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_QUIT_IMMEDIATELY))
receive();
DEBUGMSGTL(("snmpd/main", "sending shutdown trap\n"));
SnmpTrapNodeDown();
DEBUGMSGTL(("snmpd/main", "Bye...\n"));
snmp_shutdown(app_name);
shutdown_master_agent();
shutdown_agent();
if (!netsnmp_ds_get_boolean(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_LEAVE_PIDFILE) &&
(pid_file != NULL)) {
unlink(pid_file);
}
#ifdef WIN32SERVICE
agent_status = AGENT_STOPPED;
#endif
#ifdef USING_UTIL_FUNCS_RESTART_MODULE
SNMP_FREE(argvrestartname);
SNMP_FREE(argvrestart);
SNMP_FREE(argvrestartp);
#endif /* USING_UTIL_FUNCS_RESTART_MODULE */
exit_code = 0;
out:
SOCK_CLEANUP;
return exit_code;
} /* End main() -- snmpd */
#if defined(WIN32)
#include <process.h>
#include <net-snmp/library/snmp_assert.h>
static unsigned s_threadid;
HANDLE s_thread_handle;
static unsigned __stdcall wait_for_stdin(void* arg)
{
if (getc(stdin) != EOF)
netsnmp_running = 0;
return 0;
}
static void create_stdin_waiter_thread(void)
{
netsnmp_assert(s_thread_handle == 0);
s_thread_handle = (HANDLE)_beginthreadex(0, 0, wait_for_stdin, 0, 0, &s_threadid);
netsnmp_assert(s_thread_handle != 0);
}
static void join_stdin_waiter_thread(void)
{
int result;
netsnmp_assert(s_thread_handle != 0);
result = WaitForSingleObject(s_thread_handle, 1000);
netsnmp_assert(result != WAIT_TIMEOUT);
CloseHandle(s_thread_handle);
s_thread_handle = 0;
}
#endif
/*******************************************************************-o-******
* receive
*
* Parameters:
*
* Returns:
* 0 On success.
* -1 System error.
*
* Infinite while-loop which monitors incoming messages for the agent.
* Invoke the established message handlers for incoming messages on a per
* port basis. Handle timeouts.
*/
static int
receive(void)
{
int numfds;
netsnmp_large_fd_set readfds, writefds, exceptfds;
struct timeval timeout, *tvp = &timeout;
int count, block, i;
#ifdef USING_SMUX_MODULE
int sd;
#endif /* USING_SMUX_MODULE */
netsnmp_large_fd_set_init(&readfds, FD_SETSIZE);
netsnmp_large_fd_set_init(&writefds, FD_SETSIZE);
netsnmp_large_fd_set_init(&exceptfds, FD_SETSIZE);
/*
* ignore early sighup during startup
*/
reconfig = 0;
#if defined(WIN32)
create_stdin_waiter_thread();
#endif
/*
* Loop-forever: execute message handlers for sockets with data
*/
while (netsnmp_running) {
if (reconfig) {
#if HAVE_SIGHOLD
sighold(SIGHUP);
#endif
reconfig = 0;
snmp_log(LOG_INFO, "Reconfiguring daemon\n");
/* Stop and restart logging. This allows logfiles to be
rotated etc. */
netsnmp_logging_restart();
snmp_log(LOG_INFO, "NET-SNMP version %s restarted\n",
netsnmp_get_version());
update_config();
send_easy_trap(SNMP_TRAP_ENTERPRISESPECIFIC, 3);
#if HAVE_SIGHOLD
sigrelse(SIGHUP);
#endif
}
/*
* default to sleeping for a really long time. INT_MAX
* should be sufficient (eg we don't care if time_t is
* a long that's bigger than an int).
*/
tvp = &timeout;
tvp->tv_sec = INT_MAX;
tvp->tv_usec = 0;
numfds = 0;
NETSNMP_LARGE_FD_ZERO(&readfds);
NETSNMP_LARGE_FD_ZERO(&writefds);
NETSNMP_LARGE_FD_ZERO(&exceptfds);
block = 0;
snmp_select_info2(&numfds, &readfds, tvp, &block);
if (block == 1) {
tvp = NULL; /* block without timeout */
}
#ifdef USING_SMUX_MODULE
if (smux_listen_sd >= 0) {
NETSNMP_LARGE_FD_SET(smux_listen_sd, &readfds);
numfds =
smux_listen_sd >= numfds ? smux_listen_sd + 1 : numfds;
for (i = 0; i < smux_snmp_select_list_get_length(); i++) {
sd = smux_snmp_select_list_get_SD_from_List(i);
if (sd != 0)
{
NETSNMP_LARGE_FD_SET(sd, &readfds);
numfds = sd >= numfds ? sd + 1 : numfds;
}
}
}
#endif /* USING_SMUX_MODULE */
#ifndef NETSNMP_FEATURE_REMOVE_FD_EVENT_MANAGER
netsnmp_external_event_info2(&numfds, &readfds, &writefds, &exceptfds);
#endif /* NETSNMP_FEATURE_REMOVE_FD_EVENT_MANAGER */
reselect:
#ifndef NETSNMP_FEATURE_REMOVE_REGISTER_SIGNAL
for (i = 0; i < NUM_EXTERNAL_SIGS; i++) {
if (external_signal_scheduled[i]) {
external_signal_scheduled[i]--;
external_signal_handler[i](i);
}
}
#endif /* NETSNMP_FEATURE_REMOVE_REGISTER_SIGNAL */
DEBUGMSGTL(("snmpd/select", "select( numfds=%d, ..., tvp=%p)\n",
numfds, tvp));
if (tvp)
DEBUGMSGTL(("timer", "tvp %ld.%ld\n", (long) tvp->tv_sec,
(long) tvp->tv_usec));
count = netsnmp_large_fd_set_select(numfds, &readfds, &writefds, &exceptfds,
tvp);
DEBUGMSGTL(("snmpd/select", "returned, count = %d\n", count));
if (count > 0) {
#ifdef USING_SMUX_MODULE
/*
* handle the SMUX sd's
*/
if (smux_listen_sd >= 0) {
for (i = 0; i < smux_snmp_select_list_get_length(); i++) {
sd = smux_snmp_select_list_get_SD_from_List(i);
if (NETSNMP_LARGE_FD_ISSET(sd, &readfds)) {
if (smux_process(sd) < 0) {
smux_snmp_select_list_del(sd);
}
}
}
/*
* new connection
*/
if (NETSNMP_LARGE_FD_ISSET(smux_listen_sd, &readfds)) {
if ((sd = smux_accept(smux_listen_sd)) >= 0) {
smux_snmp_select_list_add(sd);
}
}
}
#endif /* USING_SMUX_MODULE */
#ifndef NETSNMP_FEATURE_REMOVE_FD_EVENT_MANAGER
netsnmp_dispatch_external_events2(&count, &readfds,
&writefds, &exceptfds);
#endif /* NETSNMP_FEATURE_REMOVE_FD_EVENT_MANAGER */
/* If there are still events leftover, process them */
if (count > 0) {
snmp_read2(&readfds);
}
} else
switch (count) {
case 0:
snmp_timeout();
break;
case -1:
DEBUGMSGTL(("snmpd/select", " errno = %d\n", errno));
if (errno == EINTR) {
/*
* likely that we got a signal. Check our special signal
* flags before retrying select.
*/
if (netsnmp_running && !reconfig) {
goto reselect;
}
continue;
} else {
snmp_log_perror("select");
}
return -1;
default:
snmp_log(LOG_ERR, "select returned %d\n", count);
return -1;
} /* endif -- count>0 */
/*
* see if persistent store needs to be saved
*/
snmp_store_if_needed();
/*
* run requested alarms
*/
run_alarms();
netsnmp_check_outstanding_agent_requests();
} /* endwhile */
netsnmp_large_fd_set_cleanup(&readfds);
netsnmp_large_fd_set_cleanup(&writefds);
netsnmp_large_fd_set_cleanup(&exceptfds);
#if defined(WIN32)
join_stdin_waiter_thread();
#endif
snmp_log(LOG_INFO, "Received TERM or STOP signal... shutting down...\n");
return 0;
} /* end receive() */
/*******************************************************************-o-******
* snmp_input
*
* Parameters:
* op
* *session
* requid
* *pdu
* *magic
*
* Returns:
* 1 On success -OR-
* Passes through Return from alarmGetResponse() when
* USING_V2PARTY_ALARM_MODULE is defined.
*
* Call-back function to manage responses to traps (informs) and alarms.
* Not used by the agent to process other Response PDUs.
*/
int
snmp_input(int op,
netsnmp_session * session,
int reqid, netsnmp_pdu *pdu, void *magic)
{
struct get_req_state *state = (struct get_req_state *) magic;
if (op == NETSNMP_CALLBACK_OP_RECEIVED_MESSAGE) {
if (pdu->command == SNMP_MSG_GET) {
if (state->type == EVENT_GET_REQ) {
/*
* this is just the ack to our inform pdu
*/
return 1;
}
}
} else if (op == NETSNMP_CALLBACK_OP_TIMED_OUT) {
if (state->type == ALARM_GET_REQ) {
/*
* Need a mechanism to replace obsolete SNMPv2p alarm
*/
}
}
return 1;
} /* end snmp_input() */
/*
* Windows Service Related functions
*/
#ifdef WIN32SERVICE
/************************************************************
* main function for Windows
* Parse command line arguments for startup options,
* to start as service or console mode application in windows.
* Invokes appropriate startup functions depending on the
* parameters passed
*************************************************************/
int
__cdecl
_tmain(int argc, TCHAR * argv[])
{
/*
* Define Service Name and Description, which appears in windows SCM
*/
LPCTSTR lpszServiceName = app_name_long; /* Service Registry Name */
LPCTSTR lpszServiceDisplayName = _T("Net-SNMP Agent"); /* Display Name */
LPCTSTR lpszServiceDescription =
#ifdef IFDESCR
_T("SNMPv2c / SNMPv3 command responder from Net-SNMP. Supports MIB objects for IP,ICMP,TCP,UDP, and network interface sub-layers.");
#else
_T("SNMPv2c / SNMPv3 command responder from Net-SNMP");
#endif
InputParams InputOptions;
int nRunType = RUN_AS_CONSOLE;
int quiet = 0;
#if 0
_CrtSetDbgFlag(_CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF /*| _CRTDBG_CHECK_ALWAYS_DF*/);
#endif
nRunType = ParseCmdLineForServiceOption(argc, argv, &quiet);
switch (nRunType) {
case REGISTER_SERVICE:
/*
* Register As service
*/
InputOptions.Argc = argc;
InputOptions.Argv = argv;
return RegisterService(lpszServiceName,
lpszServiceDisplayName,
lpszServiceDescription, &InputOptions, quiet);
case UN_REGISTER_SERVICE:
/*
* Unregister service
*/
return UnregisterService(lpszServiceName, quiet);
case RUN_AS_SERVICE:
/*
* Run as service
*/
/*
* Register Stop Function
*/
RegisterStopFunction(StopSnmpAgent);
return RunAsService(SnmpDaemonMain);
default:
/*
* Run in console mode
*/
return SnmpDaemonMain(argc, argv);
}
}
/*
* To stop Snmp Agent daemon
* This portion is still not working
*/
void
StopSnmpAgent(void)
{
/*
* Shut Down Agent
*/
SnmpdShutDown(1);
/*
* Wait till agent is completely stopped
*/
while (agent_status != AGENT_STOPPED) {
Sleep(100);
}
}
#endif /*WIN32SERVICE*/