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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1983, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)logger.c 8.1 (Berkeley) 6/6/93
  35  * $FreeBSD: src/usr.bin/logger/logger.c,v 1.5.2.3 2001/09/06 17:38:57 ru Exp $
  36  * $DragonFly: src/usr.bin/logger/logger.c,v 1.4 2005/02/25 18:08:05 liamfoy Exp $
  37  */
  38
  39 #include <sys/types.h>
  40 #include <sys/socket.h>
  41
  42 #include <ctype.h>
  43 #include <err.h>
  44 #include <netdb.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48 #include <unistd.h>
  49
  50 #define SYSLOG_NAMES
  51 #include <syslog.h>
  52
  53 static int      decode(const char *, CODE *);
  54 static int      pencode(char *);
  55 static void     logmessage(int, const char *, const char *);
  56 static void     usage(void);
  57
  58 struct socks {
  59     int sock;
  60     int addrlen;
  61     struct sockaddr_storage addr;
  62 };
  63
  64 #ifdef INET6
  65 int     family = PF_UNSPEC;     /* protocol family (IPv4, IPv6 or both) */
  66 #else
  67 int     family = PF_INET;       /* protocol family (IPv4 only) */
  68 #endif
  69 int     send_to_all = 0;        /* send message to all IPv4/IPv6 addresses */
  70
  71 /*
  72  * logger -- read and log utility
  73  *
  74  *      Reads from an input and arranges to write the result on the system
  75  *      log.
  76  */
  77 int
  78 main(int argc, char **argv)
  79 {
  80         int ch, logflags, pri;
  81         char *tag, *host, buf[1024];
  82
  83         tag = NULL;
  84         host = NULL;
  85         pri = LOG_USER | LOG_NOTICE;
  86         logflags = 0;
  87         unsetenv("TZ");
  88         while ((ch = getopt(argc, argv, "46Af:h:ip:st:")) != -1)
  89                 switch(ch) {
  90                 case '4':
  91                         family = PF_INET;
  92                         break;
  93 #ifdef INET6
  94                 case '6':
  95                         family = PF_INET6;
  96                         break;
  97 #endif
  98                 case 'A':
  99                         send_to_all++;
 100                         break;
 101                 case 'f':               /* file to log */
 102                         if (freopen(optarg, "r", stdin) == NULL)
 103                                 err(1, "%s", optarg);
 104                         break;
 105                 case 'h':               /* hostname to deliver to */
 106                         host = optarg;
 107                         break;
 108                 case 'i':               /* log process id also */
 109                         logflags |= LOG_PID;
 110                         break;
 111                 case 'p':               /* priority */
 112                         pri = pencode(optarg);
 113                         break;
 114                 case 's':               /* log to standard error */
 115                         logflags |= LOG_PERROR;
 116                         break;
 117                 case 't':               /* tag */
 118                         tag = optarg;
 119                         break;
 120                 case '?':
 121                 default:
 122                         usage();
 123                 }
 124         argc -= optind;
 125         argv += optind;
 126
 127         /* setup for logging */
 128         openlog(tag ? tag : getlogin(), logflags, 0);
 129         fclose(stdout);
 130
 131         /* log input line if appropriate */
 132         if (argc > 0) {
 133                 char *p, *endp;
 134                 size_t len;
 135
 136                 for (p = buf, endp = buf + sizeof(buf) - 2; *argv;) {
 137                         len = strlen(*argv);
 138                         if (p + len > endp && p > buf) {
 139                                 logmessage(pri, host, buf);
 140                                 p = buf;
 141                         }
 142                         if (len > sizeof(buf) - 1)
 143                                 logmessage(pri, host, *argv++);
 144                         else {
 145                                 if (p != buf)
 146                                         *p++ = ' ';
 147                                 bcopy(*argv++, p, len);
 148                                 *(p += len) = '\0';
 149                         }
 150                 }
 151                 if (p != buf)
 152                         logmessage(pri, host, buf);
 153         } else
 154                 while (fgets(buf, sizeof(buf), stdin) != NULL)
 155                         logmessage(pri, host, buf);
 156         exit(0);
 157 }
 158
 159 /*
 160  *  Send the message to syslog, either on the local host, or on a remote host
 161  */
 162 static void
 163 logmessage(int pri, const char *host, const char *buf)
 164 {
 165         static struct socks *socks;
 166         static int nsock = 0;
 167         struct addrinfo hints, *res, *r;
 168         char *line;
 169         int maxs, len, sock, error, i, lsent = 0;
 170
 171         if (host == NULL) {
 172                 syslog(pri, "%s", buf);
 173                 return;
 174         }
 175
 176         if (nsock <= 0) {       /* set up socket stuff */
 177                 /* resolve hostname */
 178                 memset(&hints, 0, sizeof(hints));
 179                 hints.ai_family = family;
 180                 hints.ai_socktype = SOCK_DGRAM;
 181                 error = getaddrinfo(host, "syslog", &hints, &res);
 182                 if (error == EAI_SERVICE) {
 183                         warnx ("syslog/udp: unknown service");  /* not fatal */
 184                         error = getaddrinfo(host, "514", &hints, &res);
 185                 }
 186                 if (error)
 187                         errx(1, "%s: %s", gai_strerror(error), host);
 188                 /* count max number of sockets we may open */
 189                 for (maxs = 0, r = res; r; r = r->ai_next, maxs++);
 190                 socks = malloc(maxs * sizeof(struct socks));
 191                 if (!socks)
 192                         err(1, "couldn't allocate memory for sockets");
 193                 for (r = res; r; r = r->ai_next) {
 194                         sock = socket(r->ai_family, r->ai_socktype,
 195                                       r->ai_protocol);
 196                         if (sock < 0)
 197                                 continue;
 198                         memcpy(&socks[nsock].addr, r->ai_addr, r->ai_addrlen);
 199                         socks[nsock].addrlen = r->ai_addrlen;
 200                         socks[nsock++].sock = sock;
 201                 }
 202                 freeaddrinfo(res);
 203                 if (nsock <= 0)
 204                         errx(1, "socket");
 205         }
 206
 207         if ((len = asprintf(&line, "<%d>%s", pri, buf)) == -1)
 208                 errx(1, "asprintf");
 209
 210         for (i = 0; i < nsock; ++i) {
 211                 lsent = sendto(socks[i].sock, line, len, 0,
 212                                (struct sockaddr *)&socks[i].addr,
 213                                socks[i].addrlen);
 214                 if (lsent == len && !send_to_all)
 215                         break;
 216         }
 217         if (lsent != len)
 218                 warnx("sendmsg");
 219
 220         free(line);
 221 }
 222
 223 /*
 224  *  Decode a symbolic name to a numeric value
 225  */
 226 static int
 227 pencode(char *s)
 228 {
 229         char *save;
 230         int fac, lev;
 231
 232         for (save = s; *s && *s != '.'; ++s);
 233         if (*s) {
 234                 *s = '\0';
 235                 fac = decode(save, facilitynames);
 236                 if (fac < 0)
 237                         errx(1, "unknown facility name: %s", save);
 238                 *s++ = '.';
 239         }
 240         else {
 241                 fac = 0;
 242                 s = save;
 243         }
 244         lev = decode(s, prioritynames);
 245         if (lev < 0)
 246                 errx(1, "unknown priority name: %s", save);
 247         return ((lev & LOG_PRIMASK) | (fac & LOG_FACMASK));
 248 }
 249
 250 int
 251 decode(const char *name, CODE *codetab)
 252 {
 253         CODE *c;
 254
 255         if (isdigit(*name))
 256                 return (atoi(name));
 257
 258         for (c = codetab; c->c_name; c++)
 259                 if (!strcasecmp(name, c->c_name))
 260                         return (c->c_val);
 261
 262         return (-1);
 263 }
 264
 265 static void
 266 usage(void)
 267 {
 268         fprintf(stderr, "usage: %s\n",
 269             "logger [-46Ais] [-f file] [-h host] [-p pri] [-t tag] [message ...]");
 270         exit(1);
 271 }