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/*++
/* NAME
/* msg_syslog 3
/* SUMMARY
/* direct diagnostics to syslog daemon
/* SYNOPSIS
/* #include <msg_syslog.h>
/*
/* void msg_syslog_init(progname, log_opt, facility)
/* const char *progname;
/* int log_opt;
/* int facility;
/*
/* int msg_syslog_set_facility(facility_name)
/* const char *facility_name;
/*
/* void msg_syslog_disable(void)
/* DESCRIPTION
/* This module implements support to report msg(3) diagnostics
/* via the syslog daemon.
/*
/* msg_syslog_init() is a wrapper around the openlog(3) routine
/* that directs subsequent msg(3) output to the syslog daemon.
/* This function may also be called to update msg_syslog
/* settings. If the program name appears to contain a process ID
/* then msg_syslog_init will attempt to suppress its own PID.
/*
/* msg_syslog_set_facility() is a helper routine that overrides the
/* logging facility that is specified with msg_syslog_init().
/* The result is zero in case of an unknown facility name.
/*
/* msg_syslog_disable() turns off the msg_syslog client,
/* until a subsequent msg_syslog_init() call.
/* SEE ALSO
/* syslog(3) syslog library
/* msg(3) diagnostics module
/* BUGS
/* Output records are truncated to 2000 characters. This is done in
/* order to defend against a buffer overflow problem in some
/* implementations of the syslog() library routine.
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*
/* Wietse Venema
/* Google, Inc.
/* 111 8th Avenue
/* New York, NY 10011, USA
/*--*/
/* System libraries. */
#include <sys_defs.h>
#include <stdlib.h> /* 44BSD stdarg.h uses abort() */
#include <stdarg.h>
#include <errno.h>
#include <syslog.h>
#include <string.h>
#include <time.h>
/* Application-specific. */
#include "vstring.h"
#include "stringops.h"
#include "msg.h"
#include "msg_output.h"
#include "msg_syslog.h"
#include "safe.h"
#include <mymalloc.h>
/*
* Stay a little below the 2048-byte limit of older syslog()
* implementations.
*/
#define MSG_SYSLOG_RECLEN 2000
struct facility_list {
const char *name;
int facility;
};
static struct facility_list facility_list[] = {
#ifdef LOG_AUTH
"auth", LOG_AUTH,
#endif
#ifdef LOG_AUTHPRIV
"authpriv", LOG_AUTHPRIV,
#endif
#ifdef LOG_CRON
"cron", LOG_CRON,
#endif
#ifdef LOG_DAEMON
"daemon", LOG_DAEMON,
#endif
#ifdef LOG_FTP
"ftp", LOG_FTP,
#endif
#ifdef LOG_KERN
"kern", LOG_KERN,
#endif
#ifdef LOG_LPR
"lpr", LOG_LPR,
#endif
#ifdef LOG_MAIL
"mail", LOG_MAIL,
#endif
#ifdef LOG_NEWS
"news", LOG_NEWS,
#endif
#ifdef LOG_SECURITY
"security", LOG_SECURITY,
#endif
#ifdef LOG_SYSLOG
"syslog", LOG_SYSLOG,
#endif
#ifdef LOG_USER
"user", LOG_USER,
#endif
#ifdef LOG_UUCP
"uucp", LOG_UUCP,
#endif
#ifdef LOG_LOCAL0
"local0", LOG_LOCAL0,
#endif
#ifdef LOG_LOCAL1
"local1", LOG_LOCAL1,
#endif
#ifdef LOG_LOCAL2
"local2", LOG_LOCAL2,
#endif
#ifdef LOG_LOCAL3
"local3", LOG_LOCAL3,
#endif
#ifdef LOG_LOCAL4
"local4", LOG_LOCAL4,
#endif
#ifdef LOG_LOCAL5
"local5", LOG_LOCAL5,
#endif
#ifdef LOG_LOCAL6
"local6", LOG_LOCAL6,
#endif
#ifdef LOG_LOCAL7
"local7", LOG_LOCAL7,
#endif
0,
};
static int msg_syslog_facility;
static int msg_syslog_enable;
/* msg_syslog_print - log info to syslog daemon */
static void msg_syslog_print(int level, const char *text)
{
static int log_level[] = {
LOG_INFO, LOG_WARNING, LOG_ERR, LOG_CRIT, LOG_CRIT,
};
static char *severity_name[] = {
"info", "warning", "error", "fatal", "panic",
};
if (msg_syslog_enable == 0)
return;
if (level < 0 || level >= (int) (sizeof(log_level) / sizeof(log_level[0])))
msg_panic("msg_syslog_print: invalid severity level: %d", level);
if (level == MSG_INFO) {
syslog(msg_syslog_facility | log_level[level], "%.*s",
(int) MSG_SYSLOG_RECLEN, text);
} else {
syslog(msg_syslog_facility | log_level[level], "%s: %.*s",
severity_name[level], (int) MSG_SYSLOG_RECLEN, text);
}
}
/* msg_syslog_init - initialize */
void msg_syslog_init(const char *name, int logopt, int facility)
{
static int first_call = 1;
extern char **environ;
/*
* XXX If this program is set-gid, then TZ must not be trusted. This
* scrubbing code is in the wrong place.
*/
if (first_call) {
if (unsafe())
while (getenv("TZ")) /* There may be multiple. */
if (unsetenv("TZ") < 0) { /* Desperate measures. */
environ[0] = 0;
msg_fatal("unsetenv: %m");
}
tzset();
}
/* Hack for internal logging forwarding after config change. */
if (strchr(name, '[') != 0)
logopt &= ~LOG_PID;
openlog(name, LOG_NDELAY | logopt, facility);
if (first_call) {
first_call = 0;
msg_output(msg_syslog_print);
}
msg_syslog_enable = 1;
}
/* msg_syslog_set_facility - set logging facility by name */
int msg_syslog_set_facility(const char *facility_name)
{
struct facility_list *fnp;
for (fnp = facility_list; fnp->name; ++fnp) {
if (!strcmp(fnp->name, facility_name)) {
msg_syslog_facility = fnp->facility;
return (1);
}
}
return 0;
}
/* msg_syslog_disable - disable the msg_syslog client */
void msg_syslog_disable(void)
{
msg_syslog_enable = 0;
}
#ifdef TEST
/*
* Proof-of-concept program to test the syslogging diagnostics interface
*
* Usage: msg_syslog_test text...
*/
int main(int argc, char **argv)
{
VSTRING *vp = vstring_alloc(256);
msg_syslog_init(argv[0], LOG_PID, LOG_MAIL);
if (argc < 2)
msg_error("usage: %s text to be logged", argv[0]);
while (--argc && *++argv) {
vstring_strcat(vp, *argv);
if (argv[1])
vstring_strcat(vp, " ");
}
msg_warn("static text");
msg_warn("dynamic text: >%s<", vstring_str(vp));
msg_warn("dynamic numeric: >%d<", 42);
msg_warn("error text: >%m<");
msg_warn("dynamic: >%s<: error: >%m<", vstring_str(vp));
vstring_free(vp);
return (0);
}
#endif
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