📄 snmpd.c
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//==========================================================================
//
// ./agent/current/src/snmpd.c
//
//
//==========================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with eCos; if not, write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
//
// As a special exception, if other files instantiate templates or use macros
// or inline functions from this file, or you compile this file and link it
// with other works to produce a work based on this file, this file does not
// by itself cause the resulting work to be covered by the GNU General Public
// License. However the source code for this file must still be made available
// in accordance with section (3) of the GNU General Public License.
//
// This exception does not invalidate any other reasons why a work based on
// this file might be covered by the GNU General Public License.
//
// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
// at http://sources.redhat.com/ecos/ecos-license/
// -------------------------------------------
//####ECOSGPLCOPYRIGHTEND####
//####UCDSNMPCOPYRIGHTBEGIN####
//
// -------------------------------------------
//
// Portions of this software may have been derived from the UCD-SNMP
// project, <http://ucd-snmp.ucdavis.edu/> from the University of
// California at Davis, which was originally based on the Carnegie Mellon
// University SNMP implementation. Portions of this software are therefore
// covered by the appropriate copyright disclaimers included herein.
//
// The release used was version 4.1.2 of May 2000. "ucd-snmp-4.1.2"
// -------------------------------------------
//
//####UCDSNMPCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): hmt
// Contributors: hmt
// Date: 2000-05-30
// Purpose: Port of UCD-SNMP distribution to eCos.
// Description:
//
//
//####DESCRIPTIONEND####
//
//==========================================================================
/********************************************************************
Copyright 1989, 1991, 1992 by Carnegie Mellon University
Derivative Work -
Copyright 1996, 1998, 1999, 2000 The Regents of the University of California
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 appears in all copies and
that both that copyright notice and this permission notice appear in
supporting documentation, and that the name of CMU and The Regents of
the University of California not be used in advertising or publicity
pertaining to distribution of the software without specific written
permission.
CMU AND THE REGENTS OF THE UNIVERSITY OF CALIFORNIA DISCLAIM ALL
WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL CMU OR
THE REGENTS OF THE UNIVERSITY OF CALIFORNIA BE LIABLE FOR ANY SPECIAL,
INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
FROM THE 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.
*********************************************************************/
/*
* snmpd.c - rrespond to SNMP queries from management stations
*
*/
/***********************************************************
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.
******************************************************************/
#include <config.h>
#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
# ifdef WIN32
# include <sys/timeb.h>
# else
# include <sys/time.h>
# endif
# 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>
#elif HAVE_WINSOCK_H
#include <winsock.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
#if 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
#ifndef FD_SET
typedef long fd_mask;
#define NFDBITS (sizeof(fd_mask) * NBBY) /* bits per mask */
#define FD_SET(n, p) ((p)->fds_bits[(n)/NFDBITS] |= (1 << ((n) % NFDBITS)))
#define FD_CLR(n, p) ((p)->fds_bits[(n)/NFDBITS] &= ~(1 << ((n) % NFDBITS)))
#define FD_ISSET(n, p) ((p)->fds_bits[(n)/NFDBITS] & (1 << ((n) % NFDBITS)))
#define FD_ZERO(p) memset((p), 0, sizeof(*(p)))
#endif
#if HAVE_DMALLOC_H
#include <dmalloc.h>
#endif
#include "asn1.h"
#include "snmp_api.h"
#include "snmp_impl.h"
#include "system.h"
#include "read_config.h"
#include "snmp.h"
#include "mib.h"
#include "m2m.h"
#include "snmp_vars.h"
#include "agent_read_config.h"
#ifdef CYGPKG_SNMPAGENT_V3_SUPPORT
#include "snmpv3.h"
#endif
#include "callback.h"
#include "snmp_alarm.h"
#include "default_store.h"
#include "mib_module_config.h"
#include "snmp_client.h"
#include "snmpd.h"
#include "var_struct.h"
#include "mibgroup/struct.h"
#include "mibgroup/util_funcs.h"
#include "snmp_debug.h"
#include "mib_modules.h"
#ifdef CYGPKG_SNMPAGENT_V3_SUPPORT
#include "snmpusm.h"
#endif
#include "tools.h"
#include "lcd_time.h"
#include "transform_oids.h"
#include "snmp_agent.h"
#include "agent_trap.h"
#include "ds_agent.h"
#include "agent_read_config.h"
#include "snmp_logging.h"
#include "version.h"
#include "mib_module_includes.h"
/*
* Globals.
*/
#ifdef USE_LIBWRAP
#include <tcpd.h>
int allow_severity = LOG_INFO;
int deny_severity = LOG_WARNING;
#endif /* USE_LIBWRAP */
#define TIMETICK 500000L
#define ONE_SEC 1000000L
static int log_addresses = 0;
int snmp_dump_packet;
static int running = 1;
static int reconfig = 0;
struct addrCache {
in_addr_t addr;
int status;
#define UNUSED 0
#define USED 1
#define OLD 2
};
#define ADDRCACHE 10
static struct addrCache addrCache[ADDRCACHE];
static int lastAddrAge = 0;
extern char **argvrestartp;
extern char *argvrestart;
extern char *argvrestartname;
#define NUM_SOCKETS 32
#ifdef USING_SMUX_MODULE
static int sdlist[NUM_SOCKETS], sdlen = 0;
int smux_listen_sd;
#endif /* USING_SMUX_MODULE */
/*
* Prototypes.
*/
int snmp_read_packet (int);
int snmp_input (int, struct snmp_session *, int, struct snmp_pdu *, void *);
int main (int, char **);
static void SnmpTrapNodeDown (void);
static int receive(void);
int snmp_check_packet(struct snmp_session*, snmp_ipaddr);
int snmp_check_parse(struct snmp_session*, struct snmp_pdu*, int);
#if !defined(__ECOS)
static void usage(char *prog)
{
printf("\nUsage: %s [-h] [-v] [-f] [-a] [-d] [-V] [-P PIDFILE] [-q] [-D] [-p NUM] [-L] [-l LOGFILE] [-r]",prog);
#if HAVE_UNISTD_H
printf(" [-u uid] [-g gid]");
#endif
printf("\n");
printf("\n\tVersion: %s\n",VersionInfo);
printf("\tAuthor: Wes Hardaker\n");
printf("\tEmail: ucd-snmp-coders@ucd-snmp.ucdavis.edu\n");
printf("\n-h\t\tThis usage message.\n");
printf("-H\t\tDisplay configuration file directives understood.\n");
printf("-v\t\tVersion information.\n");
printf("-f\t\tDon't fork from the shell.\n");
printf("-a\t\tLog addresses.\n");
printf("-d\t\tDump sent and received UDP SNMP packets\n");
printf("-V\t\tVerbose display\n");
printf("-P PIDFILE\tUse PIDFILE to store process id\n");
printf("-q\t\tPrint information in a more parsable format (quick-print)\n");
printf("-D\t\tTurn on debugging output\n");
printf("-p NUM\t\tRun on port NUM instead of the default: 161\n");
printf("-x SOCKADDR\tBind AgentX to this address\n");
printf("-c CONFFILE\tRead CONFFILE as a configuration file.\n");
printf("-C\t\tDon't read the default configuration files.\n");
printf("-L\t\tPrint warnings/messages to stdout/err\n");
printf("-s\t\tLog warnings/messages to syslog\n");
printf("-A\t\tAppend to the logfile rather than truncating it.\n");
printf("-r Don't exit if root only accessible files can't be opened\n");
printf("-l LOGFILE\tPrint warnings/messages to LOGFILE\n");
printf("\t\t(By default LOGFILE=%s)\n",
#ifdef LOGFILE
LOGFILE
#else
"none"
#endif
);
#if HAVE_UNISTD_H
printf("-g \t\tChange to this gid after opening port\n");
printf("-u \t\tChange to this uid after opening port\n");
#endif
printf("\n");
exit(1);
}
#endif // !defined(__ECOS)
RETSIGTYPE
SnmpdShutDown(int a)
{
running = 0;
}
#ifdef SIGHUP
RETSIGTYPE
SnmpdReconfig(int a)
{
reconfig = 1;
signal(SIGHUP, SnmpdReconfig);
}
#endif
#ifdef SIGUSR1
extern void dump_registry( void );
RETSIGTYPE
SnmpdDump(int a)
{
dump_registry();
signal(SIGUSR1, SnmpdDump);
}
#endif
static void
SnmpTrapNodeDown(void)
{
send_easy_trap (SNMP_TRAP_ENTERPRISESPECIFIC, 2);
/* XXX 2 - Node Down #define it as NODE_DOWN_TRAP */
}
/*******************************************************************-o-******
* main
*
* Parameters:
* argc
* *argv[]
*
* Returns:
* 0 Always succeeds. (?)
*
*
* Setup and start the agent daemon.
*
* Also successfully EXITs with zero for some options.
*/
#if !defined(__ECOS)
int
main(int argc, char *argv[])
{
int arg, i;
int ret;
u_short dest_port = SNMP_PORT;
int dont_fork = 0;
char logfile[SNMP_MAXBUF_SMALL];
char *cptr, **argvptr;
char *pid_file = NULL;
#if HAVE_GETPID
FILE *PID;
#endif
int dont_zero_log = 0;
int stderr_log=0, syslog_log=0;
int uid=0, gid=0;
logfile[0] = 0;
#ifdef LOGFILE
strcpy(logfile, LOGFILE);
#endif
/*
* usage: snmpd
*/
for (arg = 1; arg < argc; arg++)
{
if (argv[arg][0] == '-') {
switch (argv[arg][1]) {
case 'c':
if (++arg == argc)
usage(argv[0]);
ds_set_string(DS_LIBRARY_ID, DS_LIB_OPTIONALCONFIG,
argv[arg]);
break;
case 'C':
ds_set_boolean(DS_LIBRARY_ID, DS_LIB_DONT_READ_CONFIGS, 1);
break;
case 'd':
snmp_set_dump_packet(++snmp_dump_packet);
ds_set_boolean(DS_APPLICATION_ID, DS_AGENT_VERBOSE, 1);
break;
case 'q':
snmp_set_quick_print(1);
break;
case 'T':
if (argv[arg][2] != '\0')
cptr = &argv[arg][2];
else if (++arg>argc) {
fprintf(stderr,"Need UDP or TCP after -T flag.\n");
usage(argv[0]);
exit(1);
} else {
cptr = argv[arg];
}
if (strcasecmp(cptr,"TCP") == 0) {
ds_set_int(DS_APPLICATION_ID, DS_AGENT_FLAGS,
ds_get_int(DS_APPLICATION_ID, DS_AGENT_FLAGS)
| SNMP_FLAGS_STREAM_SOCKET);
} else if (strcasecmp(cptr,"UDP") == 0) {
/* default, do nothing */
} else {
fprintf(stderr,
"Unknown transport \"%s\" after -T flag.\n",
cptr);
usage(argv[0]);
exit(1);
}
break;
case 'D':
debug_register_tokens(&argv[arg][2]);
snmp_set_do_debugging(1);
break;
case 'p':
if (++arg == argc)
usage(argv[0]);
dest_port = atoi(argv[arg]);
if (dest_port <= 0)
usage(argv[0]);
break;
case 'x':
if (++arg == argc)
usage(argv[0]);
ds_set_string(DS_APPLICATION_ID, DS_AGENT_X_SOCKET, argv[arg]);
break;
case 'r':
ds_set_boolean(DS_APPLICATION_ID,
DS_AGENT_NO_ROOT_ACCESS, 1);
break;
case 'P':
if (++arg == argc)
usage(argv[0]);
pid_file = argv[arg];
case 'a':
log_addresses++;
break;
case 'V':
ds_set_boolean(DS_APPLICATION_ID, DS_AGENT_VERBOSE, 1);
break;
case 'f':
dont_fork = 1;
break;
case 'l':
if (++arg == argc)
usage(argv[0]);
strcpy(logfile, argv[arg]);
break;
case 'L':
stderr_log=1;
break;
case 's':
syslog_log=1;
break;
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