support/nfs/xlog.c

   1 /*
   2  * support/nfs/xlog.c
   3  *
   4  * This module handles the logging of requests.
   5  *
   6  * TODO:        Merge the two "XXX_log() calls.
   7  *
   8  * Authors:     Donald J. Becker, <becker@super.org>
   9  *              Rick Sladkey, <jrs@world.std.com>
  10  *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  11  *              Olaf Kirch, <okir@monad.swb.de>
  12  *
  13  *              This software maybe be used for any purpose provided
  14  *              the above copyright notice is retained.  It is supplied
  15  *              as is, with no warranty expressed or implied.
  16  */
  17
  18 #include "config.h"
  19
  20 #include <unistd.h>
  21 #include <signal.h>
  22 #include <time.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <stdio.h>
  26 #include <stdarg.h>
  27 #include <syslog.h>
  28 #include "nfslib.h"
  29
  30 #undef  VERBOSE_PRINTF
  31
  32 static int  log_stderr = 1;
  33 static int  log_syslog = 1;
  34 static int  logging = 0;                /* enable/disable DEBUG logs    */
  35 static int  logmask = 0;                /* What will be logged          */
  36 static char log_name[256];              /* name of this program         */
  37 static int  log_pid = -1;               /* PID of this program          */
  38
  39 static void     xlog_toggle(int sig);
  40 static struct xlog_debugfac     debugnames[] = {
  41         { "general",    D_GENERAL, },
  42         { "call",       D_CALL, },
  43         { "auth",       D_AUTH, },
  44         { "parse",      D_PARSE, },
  45         { "all",        D_ALL, },
  46         { NULL,         0, },
  47 };
  48
  49 void
  50 xlog_open(char *progname)
  51 {
  52         openlog(progname, LOG_PID, LOG_DAEMON);
  53
  54         strncpy(log_name, progname, sizeof (log_name) - 1);
  55         log_name [sizeof (log_name) - 1] = '\0';
  56         log_pid = getpid();
  57
  58         signal(SIGUSR1, xlog_toggle);
  59         signal(SIGUSR2, xlog_toggle);
  60 }
  61
  62 void
  63 xlog_stderr(int on)
  64 {
  65         log_stderr = on;
  66 }
  67
  68 void
  69 xlog_syslog(int on)
  70 {
  71         log_syslog = on;
  72 }
  73
  74 static void
  75 xlog_toggle(int sig)
  76 {
  77         unsigned int    tmp, i;
  78
  79         if (sig == SIGUSR1) {
  80                 if ((logmask & D_ALL) && !logging) {
  81                         xlog(D_GENERAL, "turned on logging");
  82                         logging = 1;
  83                         return;
  84                 }
  85                 tmp = ~logmask;
  86                 logmask |= ((logmask & D_ALL) << 1) | D_GENERAL;
  87                 for (i = -1, tmp &= logmask; tmp; tmp >>= 1, i++)
  88                         if (tmp & 1)
  89                                 xlog(D_GENERAL,
  90                                         "turned on logging level %d", i);
  91         } else {
  92                 xlog(D_GENERAL, "turned off logging");
  93                 logging = 0;
  94         }
  95         signal(sig, xlog_toggle);
  96 }
  97
  98 void
  99 xlog_config(int fac, int on)
 100 {
 101         if (on)
 102                 logmask |= fac;
 103         else
 104                 logmask &= ~fac;
 105         if (on)
 106                 logging = 1;
 107 }
 108
 109 void
 110 xlog_sconfig(char *kind, int on)
 111 {
 112         struct xlog_debugfac    *tbl = debugnames;
 113
 114         while (tbl->df_name != NULL && strcasecmp(tbl->df_name, kind))
 115                 tbl++;
 116         if (!tbl->df_name) {
 117                 xlog (L_WARNING, "Invalid debug facility: %s\n", kind);
 118                 return;
 119         }
 120         xlog_config(tbl->df_fac, on);
 121 }
 122
 123 int
 124 xlog_enabled(int fac)
 125 {
 126         return (logging && (fac & logmask));
 127 }
 128
 129
 130 /* Write something to the system logfile and/or stderr */
 131 void
 132 xlog(int kind, const char *fmt, ...)
 133 {
 134         char            buff[1024];
 135         va_list         args;
 136         int             n;
 137
 138         if (!(kind & (L_ALL)) && !(logging && (kind & logmask)))
 139                 return;
 140
 141         va_start(args, fmt);
 142         vsnprintf(buff, sizeof (buff), fmt, args);
 143         va_end(args);
 144
 145         if ((n = strlen(buff)) > 0 && buff[n-1] == '\n')
 146                 buff[--n] = '\0';
 147
 148         if (log_syslog) {
 149                 switch (kind) {
 150                 case L_FATAL:
 151                         syslog(LOG_ERR, "%s", buff);
 152                         break;
 153                 case L_ERROR:
 154                         syslog(LOG_ERR, "%s", buff);
 155                         break;
 156                 case L_WARNING:
 157                         syslog(LOG_WARNING, "%s", buff);
 158                         break;
 159                 case L_NOTICE:
 160                         syslog(LOG_NOTICE, "%s", buff);
 161                         break;
 162                 default:
 163                         if (!log_stderr)
 164                                 syslog(LOG_INFO, "%s", buff);
 165                         break;
 166                 }
 167         }
 168
 169         if (log_stderr) {
 170 #ifdef VERBOSE_PRINTF
 171                 time_t          now;
 172                 struct tm       *tm;
 173
 174                 time(&now);
 175                 tm = localtime(&now);
 176                 fprintf(stderr, "%s[%d] %04d-%02d-%02d %02d:%02d:%02d %s\n",
 177                                 log_name, log_pid,
 178                                 tm->tm_year+1900, tm->tm_mon + 1, tm->tm_mday,
 179                                 tm->tm_hour, tm->tm_min, tm->tm_sec,
 180                                 buff);
 181 #else
 182                 fprintf(stderr, "%s: %s\n", log_name, buff);
 183 #endif
 184         }
 185
 186         if (kind == L_FATAL)
 187                 exit(1);
 188 }