add getopt, don't overflow with command line arguments, use strcasecmp

[unix-history] / usr / src / usr.bin / logger / logger.c

/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and that due credit is given
* to the University of California at Berkeley. The name of the University
* may not be used to endorse or promote products derived from this
* software without specific prior written permission. This software
* is provided ``as is'' without express or implied warranty.
*/

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1983 Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)logger.c    6.5 (Berkeley) %G%";
#endif /* not lint */

#include <stdio.h>
#include <syslog.h>
#include <ctype.h>

/*
**  LOGGER -- read and log utility
**
**      This routine reads from an input and arranges to write the
**      result on the system log, along with a useful tag.
*/

main(argc, argv)
       int argc;
       char **argv;
{
       extern char *optarg;
       extern int optind;
       int pri = LOG_NOTICE;
       int ch, logflags = 0;
       char *tag, buf[200], *getlogin();

       tag = NULL;
       while ((ch = getopt(argc, argv, "f:ip:t:")) != EOF)
               switch((char)ch) {
               case 'f':               /* file to log */
                       if (freopen(optarg, "r", stdin) == NULL) {
                               fprintf("logger: ");
                               perror(optarg);
                               exit(1);
                       }
                       break;
               case 'i':               /* log process id also */
                       logflags |= LOG_PID;
                       break;
               case 'p':               /* priority */
                       pri = pencode(optarg);
                       break;
               case 't':               /* tag */
                       tag = optarg;
                       break;
               case '?':
               default:
                       usage();
               }
       argc -= optind;
       argv += optind;

       /* setup for logging */
       openlog(tag ? tag : getlogin(), logflags, 0);
       (void) fclose(stdout);

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

               for (p = buf, endp = buf + sizeof(buf) - 1;;) {
                       len = strlen(*argv);
                       if (p + len < endp) {
                               bcopy(*argv++, p, len);
                               p += len;
                               if (!--argc)
                                       break;
                               *p++ = ' ';
                       }
                       else {
                               *--p = '\0';
                               syslog(pri, buf);
                               p = buf;
                       }
               }
               if (p != buf) {
                       *p = '\0';
                       syslog(pri, buf);
               }
               exit(0);
       }

       /* main loop */
       while (fgets(buf, sizeof(buf), stdin) != NULL)
               syslog(pri, buf);

       exit(0);
}


struct code {
       char    *c_name;
       int     c_val;
};

struct code     PriNames[] = {
       "panic",        LOG_EMERG,
       "emerg",        LOG_EMERG,
       "alert",        LOG_ALERT,
       "crit",         LOG_CRIT,
       "err",          LOG_ERR,
       "error",        LOG_ERR,
       "warn",         LOG_WARNING,
       "warning",      LOG_WARNING,
       "notice",       LOG_NOTICE,
       "info",         LOG_INFO,
       "debug",        LOG_DEBUG,
       NULL,           -1
};

struct code     FacNames[] = {
       "kern",         LOG_KERN,
       "user",         LOG_USER,
       "mail",         LOG_MAIL,
       "daemon",       LOG_DAEMON,
       "auth",         LOG_AUTH,
       "security",     LOG_AUTH,
       "syslog",       LOG_SYSLOG,
       "lpr",          LOG_LPR,
       "news",         LOG_NEWS,
       "local0",       LOG_LOCAL0,
       "local1",       LOG_LOCAL1,
       "local2",       LOG_LOCAL2,
       "local3",       LOG_LOCAL3,
       "local4",       LOG_LOCAL4,
       "local5",       LOG_LOCAL5,
       "local6",       LOG_LOCAL6,
       "local7",       LOG_LOCAL7,
       NULL,           -1
};


/*
*  Decode a symbolic name to a numeric value
*/

pencode(s)
       register char *s;
{
       char *save;
       int fac, lev;

       for (save = s; *s && *s != '.'; ++s);
       if (*s) {
               *s = '\0';
               fac = decode(save, FacNames);
               if (fac < 0)
                       bailout("unknown facility name: ", save);
               *s++ = '.';
       }
       else {
               fac = 0;
               s = save;
       }
       lev = decode(s, PriNames);
       if (lev < 0)
               bailout("unknown priority name: ", save);
       return ((lev & LOG_PRIMASK) | (fac & LOG_FACMASK));
}


decode(name, codetab)
       char *name;
       struct code *codetab;
{
       register struct 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);
}

bailout(msg, arg)
       char *msg, *arg;
{
       fprintf(stderr, "logger: %s%s\n", msg, arg);
       exit(1);
}

usage()
{
       fputs("logger: [-i] [-f file] [-p pri] [-t tag] [ message ... ]\n",
           stderr);
       exit(1);
}