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net-snmp/snmplib/snmp_logging.c

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/*
* logging.c - generic logging for snmp-agent
* * Contributed by Ragnar Kjørstad, ucd@ragnark.vestdata.no 1999-06-26
*/
/* Portions of this file are subject to the following copyright(s). See
* the Net-SNMP's COPYING file for more details and other copyrights
* that may apply:
*/
/*
* Portions of this file are copyrighted by:
* 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.
*
* Portions of this file are copyrighted by:
* Copyright (c) 2016 VMware, Inc. All rights reserved.
* Use is subject to license terms specified in the COPYING file
* distributed with the Net-SNMP package.
*/
/** @defgroup snmp_logging generic logging for net-snmp
* @ingroup library
*
* @{
*/
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-features.h>
#include <stdio.h>
#if HAVE_MALLOC_H
#include <malloc.h>
#endif
#if HAVE_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif
#include <ctype.h>
#if HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#if HAVE_SYSLOG_H
#include <syslog.h>
#ifndef LOG_CONS /* Interesting Ultrix feature */
#include <sys/syslog.h>
#endif
#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_NETINET_IN_H
#include <netinet/in.h>
#endif
#include <stdarg.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_DMALLOC_H
#include <dmalloc.h>
#endif
#include <net-snmp/types.h>
#include <net-snmp/output_api.h>
#include <net-snmp/library/snmp_logging.h> /* For this file's "internal" definitions */
#include <net-snmp/config_api.h>
#include <net-snmp/utilities.h>
#include <net-snmp/library/callback.h>
#ifdef va_copy
#define NEED_VA_END_AFTER_VA_COPY
#else
#ifdef __vacopy
#define vacopy __vacopy
#define NEED_VA_END_AFTER_VA_COPY
#else
#define va_copy(dest, src) memcpy (&dest, &src, sizeof (va_list))
#endif
#endif
#ifndef HAVE_VSNPRINTF
#include "snprintf.h"
#endif
netsnmp_feature_child_of(logging_all, libnetsnmp)
netsnmp_feature_child_of(logging_outputs, logging_all)
netsnmp_feature_child_of(logging_file, logging_outputs)
netsnmp_feature_child_of(logging_stdio, logging_outputs)
netsnmp_feature_child_of(logging_syslog, logging_outputs)
netsnmp_feature_child_of(logging_external, logging_all)
netsnmp_feature_child_of(enable_stderrlog, logging_all)
netsnmp_feature_child_of(logging_enable_calllog, netsnmp_unused)
netsnmp_feature_child_of(logging_enable_loghandler, netsnmp_unused)
/* default to the file/stdio/syslog set */
netsnmp_feature_want(logging_outputs)
/*
* logh_head: A list of all log handlers, in increasing order of priority
* logh_priorities: 'Indexes' into this list, by priority
*/
netsnmp_log_handler *logh_head = NULL;
netsnmp_log_handler *logh_priorities[LOG_DEBUG+1];
static int logh_enabled = 0;
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG
static char syslogname[64] = DEFAULT_LOG_ID;
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG */
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_STDIO
netsnmp_log_handler *
netsnmp_register_stdio_loghandler(int is_stdout, int priority, int priority_max,
const char *tok);
#endif
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_FILE
netsnmp_log_handler *
netsnmp_register_filelog_handler(const char* logfilename, int priority,
int priority_max, int dont_zero_log);
#endif
void
netsnmp_disable_this_loghandler(netsnmp_log_handler *logh)
{
if (!logh || (0 == logh->enabled))
return;
logh->enabled = 0;
--logh_enabled;
netsnmp_assert(logh_enabled >= 0);
}
void
netsnmp_enable_this_loghandler(netsnmp_log_handler *logh)
{
if (!logh || (0 != logh->enabled))
return;
logh->enabled = 1;
++logh_enabled;
}
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_FILE
void
netsnmp_enable_filelog(netsnmp_log_handler *logh, int dont_zero_log);
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_FILE */
void
parse_config_logOption(const char *token, char *cptr)
{
int my_argc = 0 ;
char **my_argv = NULL;
snmp_log_options( cptr, my_argc, my_argv );
}
void
init_snmp_logging(void)
{
netsnmp_ds_register_premib(ASN_BOOLEAN, "snmp", "logTimestamp",
NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_LOG_TIMESTAMP);
register_prenetsnmp_mib_handler("snmp", "logOption",
parse_config_logOption, NULL, "string");
}
void
shutdown_snmp_logging(void)
{
snmp_disable_log();
while(NULL != logh_head)
netsnmp_remove_loghandler( logh_head );
}
/*
* These definitions handle 4.2 systems without additional syslog facilities.
*/
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG
#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
#ifndef LOG_USER
#define LOG_USER 0
#endif
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG */
/* Set line buffering mode for a stream. */
void
netsnmp_set_line_buffering(FILE *stream)
{
#if defined(WIN32)
/*
* According to MSDN, the Microsoft Visual Studio C runtime library does
* not support line buffering, so turn off buffering completely.
* See also http://msdn.microsoft.com/en-us/library/86cebhfs(VS.71).aspx.
*/
setvbuf(stream, NULL, _IONBF, BUFSIZ);
#elif defined(HAVE_SETLINEBUF)
/* setlinefunction() is a function from the BSD Unix API. */
setlinebuf(stream);
#else
/* See also the C89 or C99 standard for more information about setvbuf(). */
setvbuf(stream, NULL, _IOLBF, BUFSIZ);
#endif
}
/*
* Decodes log priority.
* @param optarg - IN - priority to decode, "0" or "0-7"
* OUT - points to last character after the decoded priority
* @param pri_max - OUT - maximum priority (i.e. 0x7 from "0-7")
*/
static int
decode_priority( char **optarg, int *pri_max )
{
int pri_low = LOG_DEBUG;
if (*optarg == NULL)
return -1;
switch (**optarg) {
case '0':
case '!':
pri_low = LOG_EMERG;
break;
case '1':
case 'a':
case 'A':
pri_low = LOG_ALERT;
break;
case '2':
case 'c':
case 'C':
pri_low = LOG_CRIT;
break;
case '3':
case 'e':
case 'E':
pri_low = LOG_ERR;
break;
case '4':
case 'w':
case 'W':
pri_low = LOG_WARNING;
break;
case '5':
case 'n':
case 'N':
pri_low = LOG_NOTICE;
break;
case '6':
case 'i':
case 'I':
pri_low = LOG_INFO;
break;
case '7':
case 'd':
case 'D':
pri_low = LOG_DEBUG;
break;
default:
fprintf(stderr, "invalid priority: %c\n",**optarg);
return -1;
}
*optarg = *optarg+1;
if (pri_max && **optarg=='-') {
*optarg = *optarg + 1; /* skip '-' */
*pri_max = decode_priority( optarg, NULL );
if (*pri_max == -1) return -1;
if (pri_low < *pri_max) {
int tmp = pri_low;
pri_low = *pri_max;
*pri_max = tmp;
}
}
return pri_low;
}
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG
static int
decode_facility( char *optarg )
{
if (optarg == NULL)
return -1;
switch (*optarg) {
case 'd':
case 'D':
return LOG_DAEMON;
case 'u':
case 'U':
return LOG_USER;
case '0':
return LOG_LOCAL0;
case '1':
return LOG_LOCAL1;
case '2':
return LOG_LOCAL2;
case '3':
return LOG_LOCAL3;
case '4':
return LOG_LOCAL4;
case '5':
return LOG_LOCAL5;
case '6':
return LOG_LOCAL6;
case '7':
return LOG_LOCAL7;
default:
fprintf(stderr, "invalid syslog facility: %c\n",*optarg);
return -1;
}
}
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG */
int
snmp_log_options(char *optarg, int argc, char *const *argv)
{
char *cp = optarg;
/*
* Hmmm... this doesn't seem to work.
* The main agent 'getopt' handling assumes
* that the -L option takes an argument,
* and objects if this is missing.
* Trying to differentiate between
* new-style "-Lx", and old-style "-L xx"
* is likely to be a major headache.
*/
char missing_opt = 'e'; /* old -L is new -Le */
int priority = LOG_DEBUG;
int pri_max = LOG_EMERG;
int inc_optind = 0;
netsnmp_log_handler *logh;
DEBUGMSGT(("logging:options", "optarg: '%s', argc %d, argv '%s'\n",
optarg, argc, argv ? argv[0] : "NULL"));
optarg++;
if (!*cp)
cp = &missing_opt;
/*
* Support '... -Lx=value ....' syntax
*/
if (*optarg == '=') {
optarg++;
}
/*
* and '.... "-Lx value" ....' (*with* the quotes)
*/
while (*optarg && isspace((unsigned char)(*optarg))) {
optarg++;
}
/*
* Finally, handle ".... -Lx value ...." syntax
* (*without* surrounding quotes)
*/
if ((!*optarg) && (NULL != argv)) {
/*
* We've run off the end of the argument
* so move on to the next.
* But we might not actually need it, so don't
* increment optind just yet!
*/
optarg = argv[optind];
inc_optind = 1;
}
DEBUGMSGT(("logging:options", "*cp: '%c'\n", *cp));
switch (*cp) {
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_STDIO
/*
* Log to Standard Error
*/
case 'E':
priority = decode_priority( &optarg, &pri_max );
if (priority == -1) return -1;
if (inc_optind)
optind++;
/* Fallthrough */
case 'e':
logh = netsnmp_register_stdio_loghandler(0, priority, pri_max, "stderr");
break;
/*
* Log to Standard Output
*/
case 'O':
priority = decode_priority( &optarg, &pri_max );
if (priority == -1) return -1;
if (inc_optind)
optind++;
/* Fallthrough */
case 'o':
logh = netsnmp_register_stdio_loghandler( 1, priority, pri_max, "stdout" );
break;
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_STDIO */
/*
* Log to a named file
*/
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_FILE
case 'F':
priority = decode_priority( &optarg, &pri_max );
if (priority == -1) return -1;
while (*optarg == ' ') optarg++;
if (!*optarg && !argv) return -1;
else if (!*optarg) optarg = argv[++optind];
/* FALL THROUGH */
case 'f':
if (inc_optind)
optind++;
if (!optarg) {
fprintf(stderr, "Missing log file\n");
return -1;
}
DEBUGMSGTL(("logging:options", "%d-%d: '%s'\n", priority, pri_max, optarg));
logh = netsnmp_register_filelog_handler(optarg, priority, pri_max,
-1);
break;
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_FILE */
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG
/*
* Log to syslog
*/
case 'S':
priority = decode_priority( &optarg, &pri_max );
if (priority == -1 || !argv) return -1;
if (!optarg[0]) {
/* The command line argument with priority does not contain log
* facility. The facility must be in next argument then. */
optind++;
if (optind < argc)
optarg = argv[optind];
}
/* Fallthrough */
case 's':
if (inc_optind)
optind++;
if (!optarg) {
fprintf(stderr, "Missing syslog facility\n");
return -1;
}
logh = netsnmp_register_loghandler(NETSNMP_LOGHANDLER_SYSLOG, priority);
if (logh) {
int facility = decode_facility(optarg);
if (facility == -1) {
netsnmp_remove_loghandler(logh);
return -1;
}
logh->pri_max = pri_max;
logh->token = strdup(snmp_log_syslogname(NULL));
logh->magic = (void *)(intptr_t)facility;
snmp_enable_syslog_ident(snmp_log_syslogname(NULL), facility);
}
break;
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG */
/*
* Don't log
*/
case 'N':
priority = decode_priority( &optarg, &pri_max );
if (priority == -1) return -1;
if (inc_optind)
optind++;
/* Fallthrough */
case 'n':
/*
* disable all logs to clean them up (close files, etc),
* remove all log handlers, then register a null handler.
*/
snmp_disable_log();
while(NULL != logh_head)
netsnmp_remove_loghandler( logh_head );
logh = netsnmp_register_loghandler(NETSNMP_LOGHANDLER_NONE, priority);
if (logh) {
logh->pri_max = pri_max;
}
break;
default:
fprintf(stderr, "Unknown logging option passed to -L: %c.\n", *cp);
return -1;
}
return 0;
}
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG
char *
snmp_log_syslogname(const char *pstr)
{
if (pstr)
strlcpy (syslogname, pstr, sizeof(syslogname));
return syslogname;
}
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG */
void
snmp_log_options_usage(const char *lead, FILE * outf)
{
const char *pri1_msg = " for level 'pri' and above";
const char *pri2_msg = " for levels 'p1' to 'p2'";
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_STDIO
fprintf(outf, "%se: log to standard error\n", lead);
fprintf(outf, "%so: log to standard output\n", lead);
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_STDIO */
fprintf(outf, "%sn: don't log at all\n", lead);
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_FILE
fprintf(outf, "%sf file: log to the specified file\n", lead);
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_FILE */
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG
fprintf(outf, "%ss facility: log to syslog (via the specified facility)\n", lead);
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG */
fprintf(outf, "\n%s(variants)\n", lead);
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_FILE
fprintf(outf, "%s[EON] pri: log to standard error, output or /dev/null%s\n", lead, pri1_msg);
fprintf(outf, "%s[EON] p1-p2: log to standard error, output or /dev/null%s\n", lead, pri2_msg);
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_FILE */
fprintf(outf, "%s[FS] pri token: log to file/syslog%s\n", lead, pri1_msg);
fprintf(outf, "%s[FS] p1-p2 token: log to file/syslog%s\n", lead, pri2_msg);
}
/**
* Is logging done?
*
* @return Returns 0 if logging is off, 1 when it is done.
*
*/
int
snmp_get_do_logging(void)
{
return (logh_enabled > 0);
}
static char *
sprintf_stamp(time_t * now, char *sbuf)
{
time_t Now;
struct tm *tm;
if (now == NULL) {
now = &Now;
time(now);
}
tm = localtime(now);
sprintf(sbuf, "%.4d-%.2d-%.2d %.2d:%.2d:%.2d ",
tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
tm->tm_hour, tm->tm_min, tm->tm_sec);
return sbuf;
}
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG
void
snmp_disable_syslog_entry(netsnmp_log_handler *logh)
{
if (!logh || !logh->enabled || logh->type != NETSNMP_LOGHANDLER_SYSLOG)
return;
#ifdef WIN32
if (logh->magic) {
HANDLE eventlog_h = (HANDLE)logh->magic;
CloseEventLog(eventlog_h);
logh->magic = NULL;
}
#else
closelog();
logh->imagic = 0;
#endif
netsnmp_disable_this_loghandler(logh);
}
void
snmp_disable_syslog(void)
{
netsnmp_log_handler *logh;
for (logh = logh_head; logh; logh = logh->next)
if (logh->enabled && logh->type == NETSNMP_LOGHANDLER_SYSLOG)
snmp_disable_syslog_entry(logh);
}
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG */
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_FILE
void
snmp_disable_filelog_entry(netsnmp_log_handler *logh)
{
if (!logh /* || !logh->enabled */ || logh->type != NETSNMP_LOGHANDLER_FILE)
return;
if (logh->magic) {
fputs("\n", (FILE*)logh->magic); /* XXX - why? */
fclose((FILE*)logh->magic);
logh->magic = NULL;
}
netsnmp_disable_this_loghandler(logh);
}
void
snmp_disable_filelog(void)
{
netsnmp_log_handler *logh;
for (logh = logh_head; logh; logh = logh->next)
if (logh->enabled && logh->type == NETSNMP_LOGHANDLER_FILE)
snmp_disable_filelog_entry(logh);
}
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_FILE */
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_STDIO
netsnmp_log_handler *
netsnmp_register_stdio_loghandler(int is_stdout, int priority, int priority_max,
const char *tok)
{
netsnmp_log_handler *logh =
netsnmp_register_loghandler(NETSNMP_LOGHANDLER_STDERR, priority);
if (NULL == logh) {
return NULL;
}
if (is_stdout) {
netsnmp_set_line_buffering(stdout);
logh->imagic = 1; /* stdout, not stderr */
} else
netsnmp_set_line_buffering(stderr);
logh->pri_max = priority_max;
if (tok)
logh->token = strdup(tok);
return logh;
}
/*
* returns that status of stderr logging
*
* @retval 0 : stderr logging disabled
* @retval 1 : stderr logging enabled
*/
int
snmp_stderrlog_status(void)
{
netsnmp_log_handler *logh;
for (logh = logh_head; logh; logh = logh->next)
if (logh->enabled && (logh->type == NETSNMP_LOGHANDLER_STDOUT ||
logh->type == NETSNMP_LOGHANDLER_STDERR)) {
return 1;
}
return 0;
}
void
snmp_disable_stderrlog(void)
{
netsnmp_log_handler *logh;
for (logh = logh_head; logh; logh = logh->next)
if (logh->enabled && (logh->type == NETSNMP_LOGHANDLER_STDOUT ||
logh->type == NETSNMP_LOGHANDLER_STDERR)) {
netsnmp_disable_this_loghandler(logh);
}
}
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_STDIO */
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_ENABLE_CALLLOG
void
snmp_disable_calllog(void)
{
netsnmp_log_handler *logh;
for (logh = logh_head; logh; logh = logh->next)
if (logh->enabled && logh->type == NETSNMP_LOGHANDLER_CALLBACK) {
netsnmp_disable_this_loghandler(logh);
}
}
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_ENABLE_CALLLOG */
void
snmp_disable_log(void)
{
netsnmp_log_handler *logh;
for (logh = logh_head; logh; logh = logh->next) {
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG
if (logh->type == NETSNMP_LOGHANDLER_SYSLOG)
snmp_disable_syslog_entry(logh);
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG */
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_FILE
if (logh->type == NETSNMP_LOGHANDLER_FILE)
snmp_disable_filelog_entry(logh);
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_FILE */
netsnmp_disable_this_loghandler(logh);
}
}
/*
* close and reopen all file based logs, to allow logfile
* rotation.
*/
void
netsnmp_logging_restart(void)
{
netsnmp_log_handler *logh;
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG
int doneone = 0;
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG */
for (logh = logh_head; logh; logh = logh->next) {
if (0 == logh->enabled)
continue;
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG
if (logh->type == NETSNMP_LOGHANDLER_SYSLOG) {
snmp_disable_syslog_entry(logh);
snmp_enable_syslog_ident(logh->token,(int)(intptr_t)logh->magic);
doneone = 1;
}
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG */
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_FILE
if (logh->type == NETSNMP_LOGHANDLER_FILE && !doneone) {
snmp_disable_filelog_entry(logh);
/** hmm, don't zero status isn't saved.. i think it's
* safer not to overwrite, in case a hup is just to
* re-read config files...
*/
netsnmp_enable_filelog(logh, 1);
}
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_FILE */
}
}
/* ================================================== */
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG
void
snmp_enable_syslog(void)
{
snmp_enable_syslog_ident(snmp_log_syslogname(NULL), LOG_DAEMON);
}
void
snmp_enable_syslog_ident(const char *ident, const int facility)
{
netsnmp_log_handler *logh;
int found = 0;
int enable = 1;
#ifdef WIN32
HANDLE eventlog_h;
#else
void *eventlog_h = NULL;
#endif
snmp_disable_syslog(); /* only one syslog at a time */
#ifdef WIN32
eventlog_h = OpenEventLog(NULL, ident);
if (eventlog_h == NULL) {
/*
* Hmmm.....
* Maybe disable this handler, and log the error ?
*/
fprintf(stderr, "Could not open event log for %s. "
"Last error: 0x%x\n", ident, GetLastError());
enable = 0;
}
#else
openlog(snmp_log_syslogname(ident), LOG_CONS | LOG_PID, facility);
#endif
for (logh = logh_head; logh; logh = logh->next)
if (logh->type == NETSNMP_LOGHANDLER_SYSLOG) {
logh->magic = (void*)eventlog_h;
logh->imagic = enable; /* syslog open */
if (logh->enabled && (0 == enable))
netsnmp_disable_this_loghandler(logh);
else if ((0 == logh->enabled) && enable)
netsnmp_enable_this_loghandler(logh);
found = 1;
}
if (!found) {
logh = netsnmp_register_loghandler(NETSNMP_LOGHANDLER_SYSLOG,
LOG_DEBUG );
if (logh) {
logh->magic = (void*)eventlog_h;
logh->token = strdup(ident);
logh->imagic = enable; /* syslog open */
if (logh->enabled && (0 == enable))
netsnmp_disable_this_loghandler(logh);
else if ((0 == logh->enabled) && enable)
netsnmp_enable_this_loghandler(logh);
}
}
}
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG */
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_FILE
void
netsnmp_enable_filelog(netsnmp_log_handler *logh, int dont_zero_log)
{
FILE *logfile;
if (!logh)
return;
if (!logh->magic) {
logfile = fopen(logh->token, dont_zero_log ? "a" : "w");
if (!logfile) {
snmp_log_perror(logh->token);
return;
}
logh->magic = (void*)logfile;
netsnmp_set_line_buffering(logfile);
}
netsnmp_enable_this_loghandler(logh);
}
netsnmp_log_handler *
netsnmp_register_filelog_handler(const char* logfilename, int priority,
int priority_max, int dont_zero_log)
{
netsnmp_log_handler *logh =
netsnmp_register_loghandler(NETSNMP_LOGHANDLER_FILE,
priority );
if (NULL == logh)
return NULL;
logh->pri_max = priority_max;
logh->token = strdup(logfilename);
if (-1 == dont_zero_log)
dont_zero_log = netsnmp_ds_get_boolean(NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_APPEND_LOGFILES);
netsnmp_enable_filelog(logh, dont_zero_log);
return logh;
}
void
snmp_enable_filelog(const char *logfilename, int dont_zero_log)
{
netsnmp_log_handler *logh;
/*
* don't disable ALL filelogs whenever a new one is enabled.
* this prevents '-Lf file' from working in snmpd, as the
* call to set up /var/log/snmpd.log will disable the previous
* log setup.
* snmp_disable_filelog();
*/
if (logfilename) {
logh = netsnmp_find_loghandler( logfilename );
if (!logh)
logh = netsnmp_register_filelog_handler( logfilename, LOG_DEBUG,
0, dont_zero_log );
else
netsnmp_enable_filelog(logh, dont_zero_log);
} else {
for (logh = logh_head; logh; logh = logh->next)
if (logh->type == NETSNMP_LOGHANDLER_FILE)
netsnmp_enable_filelog(logh, dont_zero_log);
}
}
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_FILE */
#ifndef NETSNMP_FEATURE_REMOVE_ENABLE_STDERRLOG
/* used in the perl modules and ip-mib/ipv4InterfaceTable/ipv4InterfaceTable_subagent.c */
void
snmp_enable_stderrlog(void)
{
netsnmp_log_handler *logh;
int found = 0;
for (logh = logh_head; logh; logh = logh->next)
if (logh->type == NETSNMP_LOGHANDLER_STDOUT ||
logh->type == NETSNMP_LOGHANDLER_STDERR) {
netsnmp_enable_this_loghandler(logh);
found = 1;
}
if (!found) {
logh = netsnmp_register_loghandler(NETSNMP_LOGHANDLER_STDERR,
LOG_DEBUG );
if (logh)
logh->token = strdup("stderr");
}
}
#endif /* NETSNMP_FEATURE_REMOVE_ENABLE_STDERRLOG */
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_ENABLE_CALLLOG
void
snmp_enable_calllog(void) /* XXX - or take a callback routine ??? */
{
netsnmp_log_handler *logh;
int found = 0;
for (logh = logh_head; logh; logh = logh->next)
if (logh->type == NETSNMP_LOGHANDLER_CALLBACK) {
netsnmp_enable_this_loghandler(logh);
found = 1;
}
if (!found) {
logh = netsnmp_register_loghandler(NETSNMP_LOGHANDLER_CALLBACK,
LOG_DEBUG );
if (logh)
logh->token = strdup("callback");
}
}
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_ENABLE_CALLLOG */
/* ==================================================== */
netsnmp_log_handler *
netsnmp_find_loghandler( const char *token )
{
netsnmp_log_handler *logh;
if (!token)
return NULL;
for (logh = logh_head; logh; logh = logh->next)
if (logh->token && !strcmp( token, logh->token ))
break;
return logh;
}
int
netsnmp_add_loghandler( netsnmp_log_handler *logh )
{
int i;
netsnmp_log_handler *logh2;
if (!logh)
return 0;
/*
* Find the appropriate point for the new entry...
* (logh2 will point to the entry immediately following)
*/
for (logh2 = logh_head; logh2; logh2 = logh2->next)
if ( logh2->priority >= logh->priority )
break;
/*
* ... and link it into the main list.
*/
if (logh2) {
if (logh2->prev)
logh2->prev->next = logh;
else
logh_head = logh;
logh->next = logh2;
logh2->prev = logh;
} else if (logh_head ) {
/*
* If logh2 is NULL, we're tagging on to the end
*/
for (logh2 = logh_head; logh2->next; logh2 = logh2->next)
;
logh2->next = logh;
} else {
logh_head = logh;
}
/*
* Also tweak the relevant priority-'index' array.
*/
for (i=LOG_EMERG; i<=logh->priority; i++)
if (!logh_priorities[i] ||
logh_priorities[i]->priority >= logh->priority)
logh_priorities[i] = logh;
return 1;
}
netsnmp_log_handler *
netsnmp_register_loghandler( int type, int priority )
{
netsnmp_log_handler *logh;
logh = SNMP_MALLOC_TYPEDEF(netsnmp_log_handler);
if (!logh)
return NULL;
DEBUGMSGT(("logging:register", "registering log type %d with pri %d\n",
type, priority));
if (priority > LOG_DEBUG) {
DEBUGMSGT(("logging:register", " limiting pri %d to %d\n", priority,
LOG_DEBUG));
priority = LOG_DEBUG;
}
logh->type = type;
switch ( type ) {
case NETSNMP_LOGHANDLER_STDOUT:
logh->imagic = 1;
logh->handler = log_handler_stdouterr;
break;
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_STDIO
case NETSNMP_LOGHANDLER_STDERR:
logh->handler = log_handler_stdouterr;
break;
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_STDIO */
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_FILE
case NETSNMP_LOGHANDLER_FILE:
logh->handler = log_handler_file;
logh->imagic = 1;
break;
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_FILE */
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG
case NETSNMP_LOGHANDLER_SYSLOG:
logh->handler = log_handler_syslog;
break;
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG */
case NETSNMP_LOGHANDLER_CALLBACK:
logh->handler = log_handler_callback;
break;
case NETSNMP_LOGHANDLER_NONE:
logh->handler = log_handler_null;
break;
default:
free(logh);
return NULL;
}
logh->priority = priority;
netsnmp_enable_this_loghandler(logh);
netsnmp_add_loghandler( logh );
return logh;
}
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_ENABLE_LOGHANDLER
int
netsnmp_enable_loghandler( const char *token )
{
netsnmp_log_handler *logh;
logh = netsnmp_find_loghandler( token );
if (!logh)
return 0;
netsnmp_enable_this_loghandler(logh);
return 1;
}
int
netsnmp_disable_loghandler( const char *token )
{
netsnmp_log_handler *logh;
logh = netsnmp_find_loghandler( token );
if (!logh)
return 0;
netsnmp_disable_this_loghandler(logh);
return 1;
}
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_ENABLE_LOGHANDLER */
int
netsnmp_remove_loghandler( netsnmp_log_handler *logh )
{
int i;
if (!logh)
return 0;
if (logh->prev)
logh->prev->next = logh->next;
else
logh_head = logh->next;
if (logh->next)
logh->next->prev = logh->prev;
for (i=LOG_EMERG; i<=logh->priority; i++)
if (logh == logh_priorities[i])
logh_priorities[i] = logh->next;
free(NETSNMP_REMOVE_CONST(char*, logh->token));
SNMP_FREE(logh);
return 1;
}
/* ==================================================== */
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_STDIO
int
log_handler_stdouterr( netsnmp_log_handler* logh, int pri, const char *str)
{
static int newline = 1; /* MTCRITICAL_RESOURCE */
const char *newline_ptr;
char sbuf[40];
if (netsnmp_ds_get_boolean(NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_LOG_TIMESTAMP) && newline) {
sprintf_stamp(NULL, sbuf);
} else {
strcpy(sbuf, "");
}
/*
* Remember whether or not the current line ends with a newline for the
* next call of log_handler_stdouterr().
*/
newline_ptr = strrchr(str, '\n');
newline = newline_ptr && newline_ptr[1] == 0;
if (logh->imagic)
printf( "%s%s", sbuf, str);
else
fprintf(stderr, "%s%s", sbuf, str);
return 1;
}
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_STDIO */
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG
#ifdef WIN32
int
log_handler_syslog( netsnmp_log_handler* logh, int pri, const char *str)
{
WORD etype;
LPCTSTR event_msg[2];
HANDLE eventlog_h = logh->magic;
/*
** EVENT TYPES:
**
** Information (EVENTLOG_INFORMATION_TYPE)
** Information events indicate infrequent but significant
** successful operations.
** Warning (EVENTLOG_WARNING_TYPE)
** Warning events indicate problems that are not immediately
** significant, but that may indicate conditions that could
** cause future problems. Resource consumption is a good
** candidate for a warning event.
** Error (EVENTLOG_ERROR_TYPE)
** Error events indicate significant problems that the user
** should know about. Error events usually indicate a loss of
** functionality or data.
*/
switch (pri) {
case LOG_EMERG:
case LOG_ALERT:
case LOG_CRIT:
case LOG_ERR:
etype = EVENTLOG_ERROR_TYPE;
break;
case LOG_WARNING:
etype = EVENTLOG_WARNING_TYPE;
break;
case LOG_NOTICE:
case LOG_INFO:
case LOG_DEBUG:
etype = EVENTLOG_INFORMATION_TYPE;
break;
default:
etype = EVENTLOG_INFORMATION_TYPE;
break;
}
event_msg[0] = str;
event_msg[1] = NULL;
/* NOTE: 4th parameter must match winservice.mc:MessageId value */
if (!ReportEvent(eventlog_h, etype, 0, 100, NULL, 1, 0, event_msg, NULL)) {
/*
* Hmmm.....
* Maybe disable this handler, and log the error ?
*/
fprintf(stderr, "Could not report event. Last error: 0x%x\n",
GetLastError());
return 0;
}
return 1;
}
#else
int
log_handler_syslog( netsnmp_log_handler* logh, int pri, const char *str)
{
/*
* XXX
* We've got three items of information to work with:
* Is the syslog currently open?
* What ident string to use?
* What facility to log to?
*
* We've got two "magic" locations (imagic & magic) plus the token
*/
if (!(logh->imagic)) {
const char *ident = logh->token;
int facility = (int)(intptr_t)logh->magic;
if (!ident)
ident = netsnmp_ds_get_string(NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_APPTYPE);
openlog(ident, LOG_CONS | LOG_PID, facility);
logh->imagic = 1;
}
syslog( pri, "%s", str );
return 1;
}
#endif /* !WIN32 */
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_SYSLOG */
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_FILE
int
log_handler_file( netsnmp_log_handler* logh, int pri, const char *str)
{
FILE *fhandle;
char sbuf[40];
/*
* We use imagic to save information about whether the next output
* will start a new line, and thus might need a timestamp
*/
if (netsnmp_ds_get_boolean(NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_LOG_TIMESTAMP) && logh->imagic) {
sprintf_stamp(NULL, sbuf);
} else {
strcpy(sbuf, "");
}
/*
* If we haven't already opened the file, then do so.
* Save the filehandle pointer for next time.
*
* Note that this should still work, even if the file
* is closed in the meantime (e.g. a regular "cleanup" sweep)
*/
fhandle = (FILE*)logh->magic;
if (!logh->magic) {
fhandle = fopen(logh->token, "a+");
if (!fhandle)
return 0;
logh->magic = (void*)fhandle;
}
fprintf(fhandle, "%s%s", sbuf, str);
fflush(fhandle);
logh->imagic = str[strlen(str) - 1] == '\n';
return 1;
}
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_FILE */
int
log_handler_callback(netsnmp_log_handler* logh, int pri, const char *str)
{
/*
* XXX - perhaps replace 'snmp_call_callbacks' processing
* with individual callback log_handlers ??
*/
struct snmp_log_message slm;
int dodebug = snmp_get_do_debugging();
slm.priority = pri;
slm.msg = str;
if (dodebug) /* turn off debugging inside the callbacks else will loop */
snmp_set_do_debugging(0);
snmp_call_callbacks(SNMP_CALLBACK_LIBRARY, SNMP_CALLBACK_LOGGING, &slm);
if (dodebug)
snmp_set_do_debugging(dodebug);
return 1;
}
int
log_handler_null( netsnmp_log_handler* logh, int pri, const char *str)
{
/*
* Dummy log handler - just throw away the error completely
* You probably don't really want to do this!
*/
return 1;
}
void
snmp_log_string(int priority, const char *str)
{
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_STDIO
static int stderr_enabled = 0;
static netsnmp_log_handler lh = { 1, 0, 0, 0, "stderr",
log_handler_stdouterr, 0, NULL, NULL,
NULL };
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_STDIO */
netsnmp_log_handler *logh;
/*
* We've got to be able to log messages *somewhere*!
* If you don't want stderr logging, then enable something else.
*/
if (0 == logh_enabled) {
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_STDIO
if (!stderr_enabled) {
++stderr_enabled;
netsnmp_set_line_buffering(stderr);
}
log_handler_stdouterr( &lh, priority, str );
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_STDIO */
return;
}
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_STDIO
else if (stderr_enabled) {
stderr_enabled = 0;
log_handler_stdouterr( &lh, LOG_INFO,
"Log handling defined - disabling stderr\n" );
}
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_STDIO */
/*
* Start at the given priority, and work "upwards"....
*/
if (priority > LOG_DEBUG)
priority = LOG_DEBUG;
logh = logh_priorities[priority];
for ( ; logh; logh = logh->next ) {
/*
* ... but skipping any handlers with a "maximum priority"
* that we have already exceeded. And don't forget to
* ensure this logging is turned on (see snmp_disable_stderrlog
* and its cohorts).
*/
if (logh->enabled && (priority >= logh->pri_max))
logh->handler( logh, priority, str );
}
}
/* ==================================================== */
/**
* This snmp logging function allows variable argument list given the
* specified priority, format and a populated va_list structure.
* The default logfile this function writes to is /var/log/snmpd.log.
*
* @param priority is an integer representing the type of message to be written
* to the snmp log file. The types are errors, warning, and information.
* - The error types are:
* - LOG_EMERG system is unusable
* - LOG_ALERT action must be taken immediately
* - LOG_CRIT critical conditions
* - LOG_ERR error conditions
* - The warning type is:
* - LOG_WARNING warning conditions
* - The information types are:
* - LOG_NOTICE normal but significant condition
* - LOG_INFO informational
* - LOG_DEBUG debug-level messages
*
* @param format is a pointer to a char representing the variable argument list
* format used.
*
* @param ap is a va_list type used to traverse the list of arguments.
*
* @return Returns 0 on success, -1 when the code could not format the log-
* string, -2 when dynamic memory could not be allocated if the length
* of the log buffer is greater then 1024 bytes. For each of these
* errors a LOG_ERR messgae is written to the logfile.
*
* @see snmp_log
*/
int
snmp_vlog(int priority, const char *format, va_list ap)
{
char *buffer = NULL;
int length;
length = vasprintf(&buffer, format, ap);
if (length < 0) {
snmp_log_string(LOG_ERR, "Could not format log-string\n");
return -1;
}
snmp_log_string(priority, buffer);
free(buffer);
return 0;
}
/**
* This snmp logging function allows variable argument list given the
* specified format and priority. Calls the snmp_vlog function.
* The default logfile this function writes to is /var/log/snmpd.log.
*
* @see snmp_vlog
*/
int
snmp_log(int priority, const char *format, ...)
{
va_list ap;
int ret;
va_start(ap, format);
ret = snmp_vlog(priority, format, ap);
va_end(ap);
return (ret);
}
/*
* log a critical error.
*/
void
snmp_log_perror(const char *s)
{
char *error = strerror(errno);
if (s) {
if (error)
snmp_log(LOG_ERR, "%s: %s\n", s, error);
else
snmp_log(LOG_ERR, "%s: Error %d out-of-range\n", s, errno);
} else {
if (error)
snmp_log(LOG_ERR, "%s\n", error);
else
snmp_log(LOG_ERR, "Error %d out-of-range\n", errno);
}
}
#ifndef NETSNMP_FEATURE_REMOVE_LOGGING_EXTERNAL
/* external access to logh_head variable */
netsnmp_log_handler *
get_logh_head(void)
{
return logh_head;
}
#endif /* NETSNMP_FEATURE_REMOVE_LOGGING_EXTERNAL */
/** @} */
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