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  foreground = 1;             /* not a daemon initially       */
  33 static int  logging = 0;                /* enable/disable DEBUG logs    */
  34 static int  logmask = 0;                /* What will be logged          */
  35 static char log_name[256];              /* name of this program         */
  36 static int  log_pid = -1;               /* PID of this program          */
  37 static FILE *log_fp = (FILE *)NULL;     /* fp for the log file          */
  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         if (foreground) {
  54                 log_fp = stderr;
  55                 if (log_fp != NULL)
  56                         setbuf(log_fp, NULL);
  57         }
  58
  59         strncpy(log_name, progname, sizeof (log_name) - 1);
  60         log_name [sizeof (log_name) - 1] = '\0';
  61         log_pid = getpid();
  62
  63         signal(SIGUSR1, xlog_toggle);
  64         signal(SIGUSR2, xlog_toggle);
  65 }
  66
  67 void
  68 xlog_background(void)
  69 {
  70         foreground = 0;
  71 }
  72
  73 static void
  74 xlog_toggle(int sig)
  75 {
  76         unsigned int    tmp, i;
  77
  78         if (sig == SIGUSR1) {
  79                 if ((logmask & D_ALL) && !logging) {
  80                         xlog(D_GENERAL, "turned on logging");
  81                         logging = 1;
  82                         return;
  83                 }
  84                 tmp = ~logmask;
  85                 logmask |= ((logmask & D_ALL) << 1) | D_GENERAL;
  86                 for (i = -1, tmp &= logmask; tmp; tmp >>= 1, i++)
  87                         if (tmp & 1)
  88                                 xlog(D_GENERAL,
  89                                         "turned on logging level %d", i);
  90         } else {
  91                 xlog(D_GENERAL, "turned off logging");
  92                 logging = 0;
  93         }
  94         signal(sig, xlog_toggle);
  95 }
  96
  97 void
  98 xlog_config(int fac, int on)
  99 {
 100         if (on)
 101                 logmask |= fac;
 102         else
 103                 logmask &= ~fac;
 104         if (on)
 105                 logging = 1;
 106 }
 107
 108 void
 109 xlog_sconfig(char *kind, int on)
 110 {
 111         struct xlog_debugfac    *tbl = debugnames;
 112
 113         while (tbl->df_name != NULL && strcasecmp(tbl->df_name, kind))
 114                 tbl++;
 115         if (!tbl->df_name) {
 116                 xlog (L_WARNING, "Invalid debug facility: %s\n", kind);
 117                 return;
 118         }
 119         xlog_config(tbl->df_fac, on);
 120 }
 121
 122 int
 123 xlog_enabled(int fac)
 124 {
 125         return (logging && (fac & logmask));
 126 }
 127
 128
 129 /* Write something to the system logfile. */
 130 void
 131 xlog(int kind, const char *fmt, ...)
 132 {
 133         char            buff[1024];
 134         va_list         args;
 135         int             logged = 1, n;
 136 #ifdef VERBOSE_PRINTF
 137         time_t          now;
 138         struct tm       *tm;
 139 #endif
 140
 141         if (!(kind & (L_ALL)) && !(logging && (kind & logmask)))
 142                 return;
 143
 144         va_start(args, fmt);
 145         vsnprintf(buff, sizeof (buff), fmt, args);
 146         va_end(args);
 147         buff[sizeof (buff) - 1] = 0;
 148
 149         if ((n = strlen(buff)) > 0 && buff[n-1] != '\n') {
 150                 buff[n++] = '\n'; buff[n++] = '\0';
 151         }
 152
 153         switch (kind) {
 154         case L_FATAL:
 155                 syslog(LOG_ERR, "%s", buff);
 156                 break;
 157         case L_ERROR:
 158                 syslog(LOG_ERR, "%s", buff);
 159                 break;
 160         case L_WARNING:
 161                 syslog(LOG_WARNING, "%s", buff);
 162                 break;
 163         case L_NOTICE:
 164                 syslog(LOG_NOTICE, "%s", buff);
 165                 break;
 166         default:
 167                 logged = 0;
 168                 break;
 169         }
 170         if (!logged || foreground) {
 171                 if (!logged && log_fp == NULL) {
 172                         syslog(LOG_DEBUG, "%s", buff);
 173                 } else if (log_fp != NULL) {
 174 #ifdef VERBOSE_PRINTF
 175                         time(&now);
 176                         tm = localtime(&now);
 177                         fprintf(log_fp, "%s[%d] %02d/%02d/%02d %02d:%02d %s\n",
 178                                         log_name, log_pid,
 179                                         tm->tm_mon + 1, tm->tm_mday,
 180                                         tm->tm_year, tm->tm_hour, tm->tm_min,
 181                                         buff);
 182 #else
 183                         fprintf(log_fp, "%s: %s", log_name, buff);
 184 #endif
 185                 }
 186         }
 187         if (kind == L_FATAL)
 188                 exit(1);
 189 }