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logger.c

/*
 * Copyright (c) 1983, 1993
 *    The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the University of
 *    California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@pld.ORG.PL>
 * - added Native Language Support
 * Sun Mar 21 1999 - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
 * - fixed strerr(errno) in gettext calls
 */

#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <time.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <strings.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include "nls.h"

#define     SYSLOG_NAMES
#include <syslog.h>

int   decode __P((char *, CODE *));
int   pencode __P((char *));
void  usage __P((void));

static int optd = 0;

static int
myopenlog(const char *sock) {
       int fd;
       static struct sockaddr_un s_addr; /* AF_UNIX address of local logger */

       if (strlen(sock) >= sizeof(s_addr.sun_path)) {
             printf ("logger: openlog: pathname too long\n");
             exit(1);
       }

       s_addr.sun_family = AF_UNIX;
       (void)strcpy(s_addr.sun_path, sock);

       if ((fd = socket(AF_UNIX, optd ? SOCK_DGRAM : SOCK_STREAM, 0)) == -1) {
               printf ("socket: %s.\n", strerror(errno));
               exit (1);
       }

       if (connect(fd, (struct sockaddr *) &s_addr, sizeof(s_addr)) == -1) {
               printf ("connect: %s.\n", strerror(errno));
               exit (1);
       }
       return fd;
}

static void
mysyslog(int fd, int logflags, int pri, char *tag, char *msg) {
       char buf[1000], pid[30], *cp, *tp;
       time_t now;

       if (fd > -1) {
             /* avoid snprintf - it does not exist on ancient systems */
               if (logflags & LOG_PID)
                       sprintf (pid, "[%d]", getpid());
             else
                   pid[0] = 0;
               if (tag)
                   cp = tag;
             else {
                   cp = getlogin();
                   if (!cp)
                         cp = "<someone>";
             }
               (void)time(&now);
             tp = ctime(&now)+4;

             /* do snprintf by hand - ugly, but for once... */
               sprintf(buf, "<%d>%.15s %.200s%s: %.400s",
                  pri, tp, cp, pid, msg);

               if (write(fd, buf, strlen(buf)+1) < 0)
                       return; /* error */
       }
}

/*
 * logger -- read and log utility
 *
 *    Reads from an input and arranges to write the result on the system
 *    log.
 */
int
main(int argc, char **argv) {
      int ch, logflags, pri;
      char *tag, buf[1024];
      char *usock = NULL;
      int LogSock = -1;

      setlocale(LC_ALL, "");
      bindtextdomain(PACKAGE, LOCALEDIR);
      textdomain(PACKAGE);

      tag = NULL;
      pri = LOG_NOTICE;
      logflags = 0;
      while ((ch = getopt(argc, argv, "f:ip:st:u:d")) != -1)
            switch((char)ch) {
            case 'f':         /* file to log */
                  if (freopen(optarg, "r", stdin) == NULL) {
                        int errsv = errno;
                        (void)fprintf(stderr, _("logger: %s: %s.\n"),
                            optarg, strerror(errsv));
                        exit(1);
                  }
                  break;
            case 'i':         /* log process id also */
                  logflags |= LOG_PID;
                  break;
            case 'p':         /* priority */
                  pri = pencode(optarg);
                  break;
            case 's':         /* log to standard error */
                  logflags |= LOG_PERROR;
                  break;
            case 't':         /* tag */
                  tag = optarg;
                  break;
            case 'u':         /* unix socket */
                  usock = optarg;
                  break;
            case 'd':
                  optd = 1;   /* use datagrams */
                  break;
            case '?':
            default:
                  usage();
            }
      argc -= optind;
      argv += optind;

      /* setup for logging */
      if (!usock)
            openlog(tag ? tag : getlogin(), logflags, 0);
      else
            LogSock = myopenlog(usock);

      (void) fclose(stdout);

      /* log input line if appropriate */
      if (argc > 0) {
            register char *p, *endp;
            int len;

            for (p = buf, endp = buf + sizeof(buf) - 2; *argv;) {
                  len = strlen(*argv);
                  if (p + len > endp && p > buf) {
                      if (!usock)
                        syslog(pri, "%s", buf);
                      else
                        mysyslog(LogSock, logflags, pri, tag, buf);
                        p = buf;
                  }
                  if (len > sizeof(buf) - 1) {
                      if (!usock)
                        syslog(pri, "%s", *argv++);
                      else
                        mysyslog(LogSock, logflags, pri, tag, *argv++);
                  } else {
                        if (p != buf)
                              *p++ = ' ';
                        bcopy(*argv++, p, len);
                        *(p += len) = '\0';
                  }
            }
            if (p != buf) {
                if (!usock)
                  syslog(pri, "%s", buf);
                else
                  mysyslog(LogSock, logflags, pri, tag, buf);
            }
      } else
            while (fgets(buf, sizeof(buf), stdin) != NULL) {
                /* glibc is buggy and adds an additional newline,
                   so we have to remove it here until glibc is fixed */
                int len = strlen(buf);

                if (len > 0 && buf[len - 1] == '\n')
                      buf[len - 1] = '\0';

                if (!usock)
                  syslog(pri, "%s", buf);
                else
                  mysyslog(LogSock, logflags, pri, tag, buf);
            }
      if (!usock)
            closelog();
      else
            close(LogSock);
      exit(0);
}

/*
 *  Decode a symbolic name to a numeric value
 */
int
pencode(s)
      register char *s;
{
      char *save;
      int fac, lev;

      for (save = s; *s && *s != '.'; ++s);
      if (*s) {
            *s = '\0';
            fac = decode(save, facilitynames);
            if (fac < 0) {
                  (void)fprintf(stderr,
                      _("logger: unknown facility name: %s.\n"), save);
                  exit(1);
            }
            *s++ = '.';
      }
      else {
            fac = LOG_USER;
            s = save;
      }
      lev = decode(s, prioritynames);
      if (lev < 0) {
            (void)fprintf(stderr,
                _("logger: unknown priority name: %s.\n"), save);
            exit(1);
      }
      return ((lev & LOG_PRIMASK) | (fac & LOG_FACMASK));
}

int
decode(name, codetab)
      char *name;
      CODE *codetab;
{
      register CODE *c;

      if (isdigit(*name))
            return (atoi(name));

      for (c = codetab; c->c_name; c++)
            if (!strcasecmp(name, c->c_name))
                  return (c->c_val);

      return (-1);
}

void
usage()
{
      (void)fprintf(stderr,
          _("usage: logger [-is] [-f file] [-p pri] [-t tag] [-u socket] [ message ... ]\n"));
      exit(1);
}

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