external/ibm-public/postfix/dist/src/postlog/postlog.c

   1 /*      $NetBSD$        */
   2
   3 /*++
   4 /* NAME
   5 /*      postlog 1
   6 /* SUMMARY
   7 /*      Postfix-compatible logging utility
   8 /* SYNOPSIS
   9 /* .fi
  10 /* .ad
  11 /*      \fBpostlog\fR [\fB-iv\fR] [\fB-c \fIconfig_dir\fR]
  12 /*      [\fB-p \fIpriority\fB] [\fB-t \fItag\fR] [\fItext...\fR]
  13 /* DESCRIPTION
  14 /*      The \fBpostlog\fR(1) command implements a Postfix-compatible logging
  15 /*      interface for use in, for example, shell scripts.
  16 /*
  17 /*      By default, \fBpostlog\fR(1) logs the \fItext\fR given on the command
  18 /*      line as one record. If no \fItext\fR is specified on the command
  19 /*      line, \fBpostlog\fR(1) reads from standard input and logs each input
  20 /*      line as one record.
  21 /*
  22 /*      Logging is sent to \fBsyslogd\fR(8); when the standard error stream
  23 /*      is connected to a terminal, logging is sent there as well.
  24 /*
  25 /*      The following options are implemented:
  26 /* .IP "\fB-c \fIconfig_dir\fR"
  27 /*      Read the \fBmain.cf\fR configuration file in the named directory
  28 /*      instead of the default configuration directory.
  29 /* .IP \fB-i\fR
  30 /*      Include the process ID in the logging tag.
  31 /* .IP "\fB-p \fIpriority\fR"
  32 /*      Specifies the logging severity: \fBinfo\fR (default), \fBwarn\fR,
  33 /*      \fBerror\fR, \fBfatal\fR, or \fBpanic\fR.
  34 /* .IP "\fB-t \fItag\fR"
  35 /*      Specifies the logging tag, that is, the identifying name that
  36 /*      appears at the beginning of each logging record. A default tag
  37 /*      is used when none is specified.
  38 /* .IP \fB-v\fR
  39 /*      Enable verbose logging for debugging purposes. Multiple \fB-v\fR
  40 /*      options make the software increasingly verbose.
  41 /* ENVIRONMENT
  42 /* .ad
  43 /* .fi
  44 /* .IP MAIL_CONFIG
  45 /*      Directory with the \fBmain.cf\fR file.
  46 /* CONFIGURATION PARAMETERS
  47 /* .ad
  48 /* .fi
  49 /*      The following \fBmain.cf\fR parameters are especially relevant to
  50 /*      this program.
  51 /*
  52 /*      The text below provides only a parameter summary. See
  53 /*      \fBpostconf\fR(5) for more details including examples.
  54 /* .IP "\fBconfig_directory (see 'postconf -d' output)\fR"
  55 /*      The default location of the Postfix main.cf and master.cf
  56 /*      configuration files.
  57 /* .IP "\fBsyslog_facility (mail)\fR"
  58 /*      The syslog facility of Postfix logging.
  59 /* .IP "\fBsyslog_name (see 'postconf -d' output)\fR"
  60 /*      The mail system name that is prepended to the process name in syslog
  61 /*      records, so that "smtpd" becomes, for example, "postfix/smtpd".
  62 /* SEE ALSO
  63 /*      postconf(5), configuration parameters
  64 /*      syslogd(8), syslog daemon
  65 /* LICENSE
  66 /* .ad
  67 /* .fi
  68 /*      The Secure Mailer license must be distributed with this software.
  69 /* AUTHOR(S)
  70 /*      Wietse Venema
  71 /*      IBM T.J. Watson Research
  72 /*      P.O. Box 704
  73 /*      Yorktown Heights, NY 10598, USA
  74 /*--*/
  75
  76 /* System library. */
  77
  78 #include <sys_defs.h>
  79 #include <sys/stat.h>
  80 #include <string.h>
  81 #include <syslog.h>
  82 #include <fcntl.h>
  83 #include <stdlib.h>
  84 #include <unistd.h>
  85
  86 #ifdef STRCASECMP_IN_STRINGS_H
  87 #include <strings.h>
  88 #endif
  89
  90 /* Utility library. */
  91
  92 #include <msg.h>
  93 #include <vstring.h>
  94 #include <vstream.h>
  95 #include <vstring_vstream.h>
  96 #include <msg_output.h>
  97 #include <msg_vstream.h>
  98 #include <msg_syslog.h>
  99
 100 /* Global library. */
 101
 102 #include <mail_params.h>                /* XXX right place for LOG_FACILITY? */
 103 #include <mail_version.h>
 104 #include <mail_conf.h>
 105 #include <mail_task.h>
 106
 107 /* Application-specific. */
 108
 109  /*
 110   * Support for the severity level mapping.
 111   */
 112 struct level_table {
 113     char   *name;
 114     int     level;
 115 };
 116
 117 static struct level_table level_table[] = {
 118     "info", MSG_INFO,
 119     "warn", MSG_WARN,
 120     "warning", MSG_WARN,
 121     "error", MSG_ERROR,
 122     "err", MSG_ERROR,
 123     "fatal", MSG_FATAL,
 124     "crit", MSG_FATAL,
 125     "panic", MSG_PANIC,
 126     0,
 127 };
 128
 129 /* level_map - lookup facility or severity value */
 130
 131 static int level_map(char *name)
 132 {
 133     struct level_table *t;
 134
 135     for (t = level_table; t->name; t++)
 136         if (strcasecmp(t->name, name) == 0)
 137             return (t->level);
 138     msg_fatal("bad severity: \"%s\"", name);
 139 }
 140
 141 /* log_argv - log the command line */
 142
 143 static void log_argv(int level, char **argv)
 144 {
 145     VSTRING *buf = vstring_alloc(100);
 146
 147     while (*argv) {
 148         vstring_strcat(buf, *argv++);
 149         if (*argv)
 150             vstring_strcat(buf, " ");
 151     }
 152     msg_text(level, vstring_str(buf));
 153     vstring_free(buf);
 154 }
 155
 156 /* log_stream - log lines from a stream */
 157
 158 static void log_stream(int level, VSTREAM *fp)
 159 {
 160     VSTRING *buf = vstring_alloc(100);
 161
 162     while (vstring_get_nonl(buf, fp) != VSTREAM_EOF)
 163         msg_text(level, vstring_str(buf));
 164     vstring_free(buf);
 165 }
 166
 167 MAIL_VERSION_STAMP_DECLARE;
 168
 169 /* main - logger */
 170
 171 int     main(int argc, char **argv)
 172 {
 173     struct stat st;
 174     char   *slash;
 175     int     fd;
 176     int     ch;
 177     const char *tag;
 178     int     log_flags = 0;
 179     int     level = MSG_INFO;
 180
 181     /*
 182      * Fingerprint executables and core dumps.
 183      */
 184     MAIL_VERSION_STAMP_ALLOCATE;
 185
 186     /*
 187      * Be consistent with file permissions.
 188      */
 189     umask(022);
 190
 191     /*
 192      * To minimize confusion, make sure that the standard file descriptors
 193      * are open before opening anything else. XXX Work around for 44BSD where
 194      * fstat can return EBADF on an open file descriptor.
 195      */
 196     for (fd = 0; fd < 3; fd++)
 197         if (fstat(fd, &st) == -1
 198             && (close(fd), open("/dev/null", O_RDWR, 0)) != fd)
 199             msg_fatal("open /dev/null: %m");
 200
 201     /*
 202      * Set up diagnostics.
 203      */
 204     if ((slash = strrchr(argv[0], '/')) != 0 && slash[1])
 205         tag = mail_task(slash + 1);
 206     else
 207         tag = mail_task(argv[0]);
 208     if (isatty(STDERR_FILENO))
 209         msg_vstream_init(tag, VSTREAM_ERR);
 210     msg_syslog_init(tag, LOG_PID, LOG_FACILITY);
 211     tag = 0;
 212
 213     /*
 214      * Parse switches.
 215      */
 216     while ((ch = GETOPT(argc, argv, "c:ip:t:v")) > 0) {
 217         switch (ch) {
 218         default:
 219             msg_fatal("usage: %s [-c config_dir] [-i] [-p priority] [-t tag] [-v] [text]", tag);
 220             break;
 221         case 'c':
 222             if (setenv(CONF_ENV_PATH, optarg, 1) < 0)
 223                 msg_fatal("out of memory");
 224             break;
 225         case 'i':
 226             log_flags |= LOG_PID;
 227             break;
 228         case 'p':
 229             level = level_map(optarg);
 230             break;
 231         case 't':
 232             tag = optarg;
 233             break;
 234         case 'v':
 235             msg_verbose++;
 236             break;
 237         }
 238     }
 239
 240     /*
 241      * Process the main.cf file. This overrides any logging facility that was
 242      * specified with msg_syslog_init();
 243      */
 244     mail_conf_read();
 245     if (tag == 0 && strcmp(var_syslog_name, DEF_SYSLOG_NAME) != 0) {
 246         if ((slash = strrchr(argv[0], '/')) != 0 && slash[1])
 247             tag = mail_task(slash + 1);
 248         else
 249             tag = mail_task(argv[0]);
 250     }
 251
 252     /*
 253      * Re-initialize the logging, this time with the tag specified in main.cf
 254      * or on the command line.
 255      */
 256     if (tag != 0) {
 257         if (isatty(STDERR_FILENO))
 258             msg_vstream_init(tag, VSTREAM_ERR);
 259         msg_syslog_init(tag, LOG_PID, LOG_FACILITY);
 260     }
 261
 262     /*
 263      * Log the command line or log lines from standard input.
 264      */
 265     if (argc > optind) {
 266         log_argv(level, argv + optind);
 267     } else {
 268         log_stream(level, VSTREAM_IN);
 269     }
 270     exit(0);
 271 }