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/*
log-server.c
Author: Tatu Ylonen <ylo@cs.hut.fi>
Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
All rights reserved
Created: Mon Mar 20 21:19:30 1995 ylo
Server-side versions of debug(), log(), etc. These normally send the output
to the system log.
*/
#include "includes.h"
RCSID("$Id: log-server.c,v 1.4 1999/09/30 05:11:29 deraadt Exp $");
#include <syslog.h>
#include <sys/syslog.h>
#include "packet.h"
#include "xmalloc.h"
#include "ssh.h"
static int log_debug = 0;
static int log_quiet = 0;
static int log_on_stderr = 0;
/* Initialize the log.
av0 program name (should be argv[0])
on_stderr print also on stderr
debug send debugging messages to system log
quiet don\'t log anything
*/
void log_init(char *av0, int on_stderr, int debug, int quiet,
SyslogFacility facility)
{
int log_facility;
switch (facility)
{
case SYSLOG_FACILITY_DAEMON:
log_facility = LOG_DAEMON;
break;
case SYSLOG_FACILITY_USER:
log_facility = LOG_USER;
break;
case SYSLOG_FACILITY_AUTH:
log_facility = LOG_AUTH;
break;
case SYSLOG_FACILITY_LOCAL0:
log_facility = LOG_LOCAL0;
break;
case SYSLOG_FACILITY_LOCAL1:
log_facility = LOG_LOCAL1;
break;
case SYSLOG_FACILITY_LOCAL2:
log_facility = LOG_LOCAL2;
break;
case SYSLOG_FACILITY_LOCAL3:
log_facility = LOG_LOCAL3;
break;
case SYSLOG_FACILITY_LOCAL4:
log_facility = LOG_LOCAL4;
break;
case SYSLOG_FACILITY_LOCAL5:
log_facility = LOG_LOCAL5;
break;
case SYSLOG_FACILITY_LOCAL6:
log_facility = LOG_LOCAL6;
break;
case SYSLOG_FACILITY_LOCAL7:
log_facility = LOG_LOCAL7;
break;
default:
fprintf(stderr, "Unrecognized internal syslog facility code %d\n",
(int)facility);
exit(1);
}
log_debug = debug;
log_quiet = quiet;
log_on_stderr = on_stderr;
closelog(); /* Close any previous log. */
openlog(av0, LOG_PID, log_facility);
}
#define MSGBUFSIZE 1024
#define DECL_MSGBUF char msgbuf[MSGBUFSIZE]
/* Log this message (information that usually should go to the log). */
void log(const char *fmt, ...)
{
va_list args;
DECL_MSGBUF;
if (log_quiet)
return;
va_start(args, fmt);
vsnprintf(msgbuf, MSGBUFSIZE, fmt, args);
va_end(args);
if (log_on_stderr)
fprintf(stderr, "log: %s\n", msgbuf);
syslog(LOG_INFO, "log: %.500s", msgbuf);
}
/* Debugging messages that should not be logged during normal operation. */
void debug(const char *fmt, ...)
{
va_list args;
DECL_MSGBUF;
if (!log_debug || log_quiet)
return;
va_start(args, fmt);
vsnprintf(msgbuf, MSGBUFSIZE, fmt, args);
va_end(args);
if (log_on_stderr)
fprintf(stderr, "debug: %s\n", msgbuf);
syslog(LOG_DEBUG, "debug: %.500s", msgbuf);
}
/* Error messages that should be logged. */
void error(const char *fmt, ...)
{
va_list args;
DECL_MSGBUF;
if (log_quiet)
return;
va_start(args, fmt);
vsnprintf(msgbuf, MSGBUFSIZE, fmt, args);
va_end(args);
if (log_on_stderr)
fprintf(stderr, "error: %s\n", msgbuf);
syslog(LOG_ERR, "error: %.500s", msgbuf);
}
struct fatal_cleanup
{
struct fatal_cleanup *next;
void (*proc)(void *);
void *context;
};
static struct fatal_cleanup *fatal_cleanups = NULL;
/* Registers a cleanup function to be called by fatal() before exiting. */
void fatal_add_cleanup(void (*proc)(void *), void *context)
{
struct fatal_cleanup *cu;
cu = xmalloc(sizeof(*cu));
cu->proc = proc;
cu->context = context;
cu->next = fatal_cleanups;
fatal_cleanups = cu;
}
/* Removes a cleanup frunction to be called at fatal(). */
void fatal_remove_cleanup(void (*proc)(void *context), void *context)
{
struct fatal_cleanup **cup, *cu;
for (cup = &fatal_cleanups; *cup; cup = &cu->next)
{
cu = *cup;
if (cu->proc == proc && cu->context == context)
{
*cup = cu->next;
xfree(cu);
return;
}
}
fatal("fatal_remove_cleanup: no such cleanup function: 0x%lx 0x%lx\n",
(unsigned long)proc, (unsigned long)context);
}
/* Fatal messages. This function never returns. */
void fatal(const char *fmt, ...)
{
va_list args;
struct fatal_cleanup *cu, *next_cu;
static int fatal_called = 0;
#if defined(KRB4)
extern char *ticket;
#endif /* KRB4 */
DECL_MSGBUF;
if (log_quiet)
exit(1);
va_start(args, fmt);
vsnprintf(msgbuf, MSGBUFSIZE, fmt, args);
va_end(args);
if (log_on_stderr)
fprintf(stderr, "fatal: %s\n", msgbuf);
syslog(LOG_ERR, "fatal: %.500s", msgbuf);
if (fatal_called)
exit(1);
fatal_called = 1;
/* Call cleanup functions. */
for (cu = fatal_cleanups; cu; cu = next_cu)
{
next_cu = cu->next;
debug("Calling cleanup 0x%lx(0x%lx)",
(unsigned long)cu->proc, (unsigned long)cu->context);
(*cu->proc)(cu->context);
}
#if defined(KRB4)
/* If you forwarded a ticket you get one shot for proper
authentication. */
/* If tgt was passed unlink file */
if (ticket)
{
if (strcmp(ticket,"none"))
unlink(ticket);
else
ticket = NULL;
}
#endif /* KRB4 */
/* If local XAUTHORITY was created, remove it. */
if (xauthfile) unlink(xauthfile);
exit(1);
}
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