log-server.c

   1 /*
   2  *
   3  * log-server.c
   4  *
   5  * Author: Tatu Ylonen <ylo@cs.hut.fi>
   6  *
   7  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
   8  *                    All rights reserved
   9  *
  10  * Created: Mon Mar 20 21:19:30 1995 ylo
  11  *
  12  * Server-side versions of debug(), log(), etc.  These normally send the output
  13  * to the system log.
  14  *
  15  */
  16
  17 #include "includes.h"
  18 RCSID("$Id$");
  19
  20 #include <syslog.h>
  21 #include "packet.h"
  22 #include "xmalloc.h"
  23 #include "ssh.h"
  24
  25 #ifdef HAVE___PROGNAME
  26 extern char *__progname;
  27 #else /* HAVE___PROGNAME */
  28 const char *__progname = "sshd";
  29 #endif /* HAVE___PROGNAME */
  30
  31 static LogLevel log_level = SYSLOG_LEVEL_INFO;
  32 static int log_on_stderr = 0;
  33 static int log_facility = LOG_AUTH;
  34
  35 /* Initialize the log.
  36  *   av0        program name (should be argv[0])
  37  *   on_stderr  print also on stderr
  38  *   level      logging level
  39  */
  40
  41 void
  42 log_init(char *av0, LogLevel level, SyslogFacility facility, int on_stderr)
  43 {
  44         switch (level) {
  45         case SYSLOG_LEVEL_QUIET:
  46         case SYSLOG_LEVEL_ERROR:
  47         case SYSLOG_LEVEL_FATAL:
  48         case SYSLOG_LEVEL_INFO:
  49         case SYSLOG_LEVEL_VERBOSE:
  50         case SYSLOG_LEVEL_DEBUG:
  51                 log_level = level;
  52                 break;
  53         default:
  54                 fprintf(stderr, "Unrecognized internal syslog level code %d\n",
  55                         (int) level);
  56                 exit(1);
  57         }
  58         switch (facility) {
  59         case SYSLOG_FACILITY_DAEMON:
  60                 log_facility = LOG_DAEMON;
  61                 break;
  62         case SYSLOG_FACILITY_USER:
  63                 log_facility = LOG_USER;
  64                 break;
  65         case SYSLOG_FACILITY_AUTH:
  66                 log_facility = LOG_AUTH;
  67                 break;
  68         case SYSLOG_FACILITY_LOCAL0:
  69                 log_facility = LOG_LOCAL0;
  70                 break;
  71         case SYSLOG_FACILITY_LOCAL1:
  72                 log_facility = LOG_LOCAL1;
  73                 break;
  74         case SYSLOG_FACILITY_LOCAL2:
  75                 log_facility = LOG_LOCAL2;
  76                 break;
  77         case SYSLOG_FACILITY_LOCAL3:
  78                 log_facility = LOG_LOCAL3;
  79                 break;
  80         case SYSLOG_FACILITY_LOCAL4:
  81                 log_facility = LOG_LOCAL4;
  82                 break;
  83         case SYSLOG_FACILITY_LOCAL5:
  84                 log_facility = LOG_LOCAL5;
  85                 break;
  86         case SYSLOG_FACILITY_LOCAL6:
  87                 log_facility = LOG_LOCAL6;
  88                 break;
  89         case SYSLOG_FACILITY_LOCAL7:
  90                 log_facility = LOG_LOCAL7;
  91                 break;
  92         default:
  93                 fprintf(stderr, "Unrecognized internal syslog facility code %d\n",
  94                         (int) facility);
  95                 exit(1);
  96         }
  97         log_on_stderr = on_stderr;
  98 }
  99
 100 #define SSH_MSGBUFSIZE 1024
 101
 102 void
 103 do_log(LogLevel level, const char *fmt, va_list args)
 104 {
 105         char msgbuf[SSH_MSGBUFSIZE];
 106         char fmtbuf[SSH_MSGBUFSIZE];
 107         char *txt = NULL;
 108         int pri = LOG_INFO;
 109
 110         if (level > log_level)
 111                 return;
 112         switch (level) {
 113         case SYSLOG_LEVEL_ERROR:
 114                 txt = "error";
 115                 pri = LOG_ERR;
 116                 break;
 117         case SYSLOG_LEVEL_FATAL:
 118                 txt = "fatal";
 119                 pri = LOG_ERR;
 120                 break;
 121         case SYSLOG_LEVEL_INFO:
 122         case SYSLOG_LEVEL_VERBOSE:
 123                 pri = LOG_INFO;
 124                 break;
 125         case SYSLOG_LEVEL_DEBUG:
 126                 txt = "debug";
 127                 pri = LOG_DEBUG;
 128                 break;
 129         default:
 130                 txt = "internal error";
 131                 pri = LOG_ERR;
 132                 break;
 133         }
 134         if (txt != NULL) {
 135                 snprintf(fmtbuf, sizeof(fmtbuf), "%s: %s", txt, fmt);
 136                 vsnprintf(msgbuf, sizeof(msgbuf), fmtbuf, args);
 137         } else {
 138                 vsnprintf(msgbuf, sizeof(msgbuf), fmt, args);
 139         }
 140         if (log_on_stderr)
 141                 fprintf(stderr, "%s\n", msgbuf);
 142         openlog(__progname, LOG_PID, log_facility);
 143         syslog(pri, "%.500s", msgbuf);
 144         closelog();
 145 }