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 } 268