usr.bin/logger/logger.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1983, 1993 The Regents of the University of California.  All rights reserved.
  30  * @(#)logger.c 8.1 (Berkeley) 6/6/93
  31  * $FreeBSD: src/usr.bin/logger/logger.c,v 1.5.2.3 2001/09/06 17:38:57 ru Exp $
  32  * $DragonFly: src/usr.bin/logger/logger.c,v 1.4 2005/02/25 18:08:05 liamfoy Exp $
  33  */
  34
  35 #include <sys/types.h>
  36 #include <sys/socket.h>
  37
  38 #include <ctype.h>
  39 #include <err.h>
  40 #include <netdb.h>
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <unistd.h>
  45
  46 #define SYSLOG_NAMES
  47 #include <syslog.h>
  48
  49 static int      decode(const char *, CODE *);
  50 static int      pencode(char *);
  51 static void     logmessage(int, const char *, const char *);
  52 static void     usage(void);
  53
  54 struct socks {
  55     int sock;
  56     int addrlen;
  57     struct sockaddr_storage addr;
  58 };
  59
  60 #ifdef INET6
  61 int     family = PF_UNSPEC;     /* protocol family (IPv4, IPv6 or both) */
  62 #else
  63 int     family = PF_INET;       /* protocol family (IPv4 only) */
  64 #endif
  65 int     send_to_all = 0;        /* send message to all IPv4/IPv6 addresses */
  66
  67 /*
  68  * logger -- read and log utility
  69  *
  70  *      Reads from an input and arranges to write the result on the system
  71  *      log.
  72  */
  73 int
  74 main(int argc, char **argv)
  75 {
  76         int ch, logflags, pri;
  77         char *tag, *host, buf[1024];
  78
  79         tag = NULL;
  80         host = NULL;
  81         pri = LOG_USER | LOG_NOTICE;
  82         logflags = 0;
  83         unsetenv("TZ");
  84         while ((ch = getopt(argc, argv, "46Af:h:ip:st:")) != -1)
  85                 switch(ch) {
  86                 case '4':
  87                         family = PF_INET;
  88                         break;
  89 #ifdef INET6
  90                 case '6':
  91                         family = PF_INET6;
  92                         break;
  93 #endif
  94                 case 'A':
  95                         send_to_all++;
  96                         break;
  97                 case 'f':               /* file to log */
  98                         if (freopen(optarg, "r", stdin) == NULL)
  99                                 err(1, "%s", optarg);
 100                         break;
 101                 case 'h':               /* hostname to deliver to */
 102                         host = optarg;
 103                         break;
 104                 case 'i':               /* log process id also */
 105                         logflags |= LOG_PID;
 106                         break;
 107                 case 'p':               /* priority */
 108                         pri = pencode(optarg);
 109                         break;
 110                 case 's':               /* log to standard error */
 111                         logflags |= LOG_PERROR;
 112                         break;
 113                 case 't':               /* tag */
 114                         tag = optarg;
 115                         break;
 116                 case '?':
 117                 default:
 118                         usage();
 119                 }
 120         argc -= optind;
 121         argv += optind;
 122
 123         /* setup for logging */
 124         openlog(tag ? tag : getlogin(), logflags, 0);
 125         fclose(stdout);
 126
 127         /* log input line if appropriate */
 128         if (argc > 0) {
 129                 char *p, *endp;
 130                 size_t len;
 131
 132                 for (p = buf, endp = buf + sizeof(buf) - 2; *argv;) {
 133                         len = strlen(*argv);
 134                         if (p + len > endp && p > buf) {
 135                                 logmessage(pri, host, buf);
 136                                 p = buf;
 137                         }
 138                         if (len > sizeof(buf) - 1)
 139                                 logmessage(pri, host, *argv++);
 140                         else {
 141                                 if (p != buf)
 142                                         *p++ = ' ';
 143                                 bcopy(*argv++, p, len);
 144                                 *(p += len) = '\0';
 145                         }
 146                 }
 147                 if (p != buf)
 148                         logmessage(pri, host, buf);
 149         } else
 150                 while (fgets(buf, sizeof(buf), stdin) != NULL)
 151                         logmessage(pri, host, buf);
 152         exit(0);
 153 }
 154
 155 /*
 156  *  Send the message to syslog, either on the local host, or on a remote host
 157  */
 158 static void
 159 logmessage(int pri, const char *host, const char *buf)
 160 {
 161         static struct socks *socks;
 162         static int nsock = 0;
 163         struct addrinfo hints, *res, *r;
 164         char *line;
 165         int maxs, len, sock, error, i, lsent = 0;
 166
 167         if (host == NULL) {
 168                 syslog(pri, "%s", buf);
 169                 return;
 170         }
 171
 172         if (nsock <= 0) {       /* set up socket stuff */
 173                 /* resolve hostname */
 174                 memset(&hints, 0, sizeof(hints));
 175                 hints.ai_family = family;
 176                 hints.ai_socktype = SOCK_DGRAM;
 177                 error = getaddrinfo(host, "syslog", &hints, &res);
 178                 if (error == EAI_SERVICE) {
 179                         warnx ("syslog/udp: unknown service");  /* not fatal */
 180                         error = getaddrinfo(host, "514", &hints, &res);
 181                 }
 182                 if (error)
 183                         errx(1, "%s: %s", gai_strerror(error), host);
 184                 /* count max number of sockets we may open */
 185                 for (maxs = 0, r = res; r; r = r->ai_next, maxs++);
 186                 socks = malloc(maxs * sizeof(struct socks));
 187                 if (!socks)
 188                         err(1, "couldn't allocate memory for sockets");
 189                 for (r = res; r; r = r->ai_next) {
 190                         sock = socket(r->ai_family, r->ai_socktype,
 191                                       r->ai_protocol);
 192                         if (sock < 0)
 193                                 continue;
 194                         memcpy(&socks[nsock].addr, r->ai_addr, r->ai_addrlen);
 195                         socks[nsock].addrlen = r->ai_addrlen;
 196                         socks[nsock++].sock = sock;
 197                 }
 198                 freeaddrinfo(res);
 199                 if (nsock <= 0)
 200                         errx(1, "socket");
 201         }
 202
 203         if ((len = asprintf(&line, "<%d>%s", pri, buf)) == -1)
 204                 errx(1, "asprintf");
 205
 206         for (i = 0; i < nsock; ++i) {
 207                 lsent = sendto(socks[i].sock, line, len, 0,
 208                                (struct sockaddr *)&socks[i].addr,
 209                                socks[i].addrlen);
 210                 if (lsent == len && !send_to_all)
 211                         break;
 212         }
 213         if (lsent != len)
 214                 warnx("sendmsg");
 215
 216         free(line);
 217 }
 218
 219 /*
 220  *  Decode a symbolic name to a numeric value
 221  */
 222 static int
 223 pencode(char *s)
 224 {
 225         char *save;
 226         int fac, lev;
 227
 228         for (save = s; *s && *s != '.'; ++s);
 229         if (*s) {
 230                 *s = '\0';
 231                 fac = decode(save, facilitynames);
 232                 if (fac < 0)
 233                         errx(1, "unknown facility name: %s", save);
 234                 *s++ = '.';
 235         }
 236         else {
 237                 fac = 0;
 238                 s = save;
 239         }
 240         lev = decode(s, prioritynames);
 241         if (lev < 0)
 242                 errx(1, "unknown priority name: %s", save);
 243         return ((lev & LOG_PRIMASK) | (fac & LOG_FACMASK));
 244 }
 245
 246 int
 247 decode(const char *name, CODE *codetab)
 248 {
 249         CODE *c;
 250
 251         if (isdigit(*name))
 252                 return (atoi(name));
 253
 254         for (c = codetab; c->c_name; c++)
 255                 if (!strcasecmp(name, c->c_name))
 256                         return (c->c_val);
 257
 258         return (-1);
 259 }
 260
 261 static void
 262 usage(void)
 263 {
 264         fprintf(stderr, "usage: %s\n",
 265             "logger [-46Ais] [-f file] [-h host] [-p pri] [-t tag] [message ...]");
 266         exit(1);
 267 }