main.c revision 1.9
1 /* $NetBSD: main.c,v 1.9 1995/03/21 14:05:36 mycroft Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1988, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #ifndef lint 37 static char copyright[] = 38 "@(#) Copyright (c) 1983, 1988, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"; 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)main.c 8.1 (Berkeley) 6/5/93"; 45 #else 46 static char rcsid[] = "$NetBSD: main.c,v 1.9 1995/03/21 14:05:36 mycroft Exp $"; 47 #endif 48 #endif /* not lint */ 49 50 /* 51 * Routing Table Management Daemon 52 */ 53 #include "defs.h" 54 #include <sys/ioctl.h> 55 #include <sys/file.h> 56 57 #include <net/if.h> 58 59 #include <sys/errno.h> 60 #include <sys/signal.h> 61 #include <sys/syslog.h> 62 #include "pathnames.h" 63 64 int supplier = -1; /* process should supply updates */ 65 int gateway = 0; /* 1 if we are a gateway to parts beyond */ 66 int debug = 0; 67 int bufspace = 127*1024; /* max. input buffer size to request */ 68 struct rip *msg = (struct rip *)packet; 69 70 int getsocket __P((int, int, struct sockaddr_in *)); 71 void process __P((int)); 72 73 int 74 main(argc, argv) 75 int argc; 76 char *argv[]; 77 { 78 int n, nfd, omask, tflags = 0; 79 struct timeval *tvp, waittime; 80 struct itimerval itval; 81 register struct rip *query = msg; 82 fd_set ibits; 83 84 argv0 = argv; 85 #if BSD >= 43 86 openlog("routed", LOG_PID | LOG_ODELAY, LOG_DAEMON); 87 setlogmask(LOG_UPTO(LOG_WARNING)); 88 #else 89 openlog("routed", LOG_PID); 90 #define LOG_UPTO(x) (x) 91 #define setlogmask(x) (x) 92 #endif 93 sp = getservbyname("router", "udp"); 94 if (sp == NULL) { 95 fprintf(stderr, "routed: router/udp: unknown service\n"); 96 exit(1); 97 } 98 addr.sin_family = AF_INET; 99 addr.sin_port = sp->s_port; 100 r = socket(AF_ROUTE, SOCK_RAW, 0); 101 /* later, get smart about lookingforinterfaces */ 102 if (r) 103 shutdown(r, 0); /* for now, don't want reponses */ 104 else { 105 fprintf(stderr, "routed: no routing socket\n"); 106 exit(1); 107 } 108 s = getsocket(AF_INET, SOCK_DGRAM, &addr); 109 if (s < 0) 110 exit(1); 111 argv++, argc--; 112 while (argc > 0 && **argv == '-') { 113 if (strcmp(*argv, "-s") == 0) { 114 supplier = 1; 115 argv++, argc--; 116 continue; 117 } 118 if (strcmp(*argv, "-q") == 0) { 119 supplier = 0; 120 argv++, argc--; 121 continue; 122 } 123 if (strcmp(*argv, "-t") == 0) { 124 tflags++; 125 setlogmask(LOG_UPTO(LOG_DEBUG)); 126 argv++, argc--; 127 continue; 128 } 129 if (strcmp(*argv, "-d") == 0) { 130 debug++; 131 setlogmask(LOG_UPTO(LOG_DEBUG)); 132 argv++, argc--; 133 continue; 134 } 135 if (strcmp(*argv, "-g") == 0) { 136 gateway = 1; 137 argv++, argc--; 138 continue; 139 } 140 fprintf(stderr, 141 "usage: routed [ -s ] [ -q ] [ -t ] [ -g ]\n"); 142 exit(1); 143 } 144 145 if (debug == 0 && tflags == 0) 146 daemon(0, 0); 147 /* 148 * Any extra argument is considered 149 * a tracing log file. 150 */ 151 if (argc > 0) 152 traceon(*argv); 153 while (tflags-- > 0) 154 bumploglevel(); 155 156 (void) gettimeofday(&now, (struct timezone *)NULL); 157 /* 158 * Collect an initial view of the world by 159 * checking the interface configuration and the gateway kludge 160 * file. Then, send a request packet on all 161 * directly connected networks to find out what 162 * everyone else thinks. 163 */ 164 rtinit(); 165 ifinit(); 166 gwkludge(); 167 if (gateway > 0) 168 rtdefault(); 169 if (supplier < 0) 170 supplier = 0; 171 query->rip_cmd = RIPCMD_REQUEST; 172 query->rip_vers = RIPVERSION; 173 if (sizeof(query->rip_nets[0].rip_dst.sa_family) > 1) /* XXX */ 174 query->rip_nets[0].rip_dst.sa_family = htons((u_short)AF_UNSPEC); 175 else 176 query->rip_nets[0].rip_dst.sa_family = AF_UNSPEC; 177 query->rip_nets[0].rip_metric = htonl((u_long)HOPCNT_INFINITY); 178 toall(sndmsg, 0, NULL); 179 signal(SIGALRM, timer); 180 signal(SIGHUP, hup); 181 signal(SIGTERM, hup); 182 signal(SIGINT, rtdeleteall); 183 signal(SIGUSR1, sigtrace); 184 signal(SIGUSR2, sigtrace); 185 itval.it_interval.tv_sec = TIMER_RATE; 186 itval.it_value.tv_sec = TIMER_RATE; 187 itval.it_interval.tv_usec = 0; 188 itval.it_value.tv_usec = 0; 189 srandom(getpid()); 190 if (setitimer(ITIMER_REAL, &itval, (struct itimerval *)NULL) < 0) 191 syslog(LOG_ERR, "setitimer: %m\n"); 192 193 FD_ZERO(&ibits); 194 nfd = s + 1; /* 1 + max(fd's) */ 195 for (;;) { 196 FD_SET(s, &ibits); 197 /* 198 * If we need a dynamic update that was held off, 199 * needupdate will be set, and nextbcast is the time 200 * by which we want select to return. Compute time 201 * until dynamic update should be sent, and select only 202 * until then. If we have already passed nextbcast, 203 * just poll. 204 */ 205 if (needupdate) { 206 timersub(&nextbcast, &now, &waittime); 207 if (waittime.tv_sec < 0) { 208 waittime.tv_sec = 0; 209 waittime.tv_usec = 0; 210 } 211 if (traceactions) 212 fprintf(ftrace, 213 "select until dynamic update %d/%d sec/usec\n", 214 waittime.tv_sec, waittime.tv_usec); 215 tvp = &waittime; 216 } else 217 tvp = (struct timeval *)NULL; 218 n = select(nfd, &ibits, 0, 0, tvp); 219 if (n <= 0) { 220 /* 221 * Need delayed dynamic update if select returned 222 * nothing and we timed out. Otherwise, ignore 223 * errors (e.g. EINTR). 224 */ 225 if (n < 0) { 226 if (errno == EINTR) 227 continue; 228 syslog(LOG_ERR, "select: %m"); 229 } 230 omask = sigblock(sigmask(SIGALRM)); 231 if (n == 0 && needupdate) { 232 if (traceactions) 233 fprintf(ftrace, 234 "send delayed dynamic update\n"); 235 (void) gettimeofday(&now, 236 (struct timezone *)NULL); 237 toall(supply, RTS_CHANGED, 238 (struct interface *)NULL); 239 lastbcast = now; 240 needupdate = 0; 241 nextbcast.tv_sec = 0; 242 } 243 sigsetmask(omask); 244 continue; 245 } 246 (void) gettimeofday(&now, (struct timezone *)NULL); 247 omask = sigblock(sigmask(SIGALRM)); 248 #ifdef doesntwork 249 /* 250 printf("s %d, ibits %x index %d, mod %d, sh %x, or %x &ibits %x\n", 251 s, 252 ibits.fds_bits[0], 253 (s)/(sizeof(fd_mask) * 8), 254 ((s) % (sizeof(fd_mask) * 8)), 255 (1 << ((s) % (sizeof(fd_mask) * 8))), 256 ibits.fds_bits[(s)/(sizeof(fd_mask) * 8)] & (1 << ((s) % (sizeof(fd_mask) * 8))), 257 &ibits 258 ); 259 */ 260 if (FD_ISSET(s, &ibits)) 261 #else 262 if (ibits.fds_bits[s/32] & (1 << s)) 263 #endif 264 process(s); 265 /* handle ICMP redirects */ 266 sigsetmask(omask); 267 } 268 } 269 270 void 271 process(fd) 272 int fd; 273 { 274 struct sockaddr from; 275 int fromlen, cc; 276 union { 277 char buf[MAXPACKETSIZE+1]; 278 struct rip rip; 279 } inbuf; 280 281 for (;;) { 282 fromlen = sizeof (from); 283 cc = recvfrom(fd, &inbuf, sizeof (inbuf), 0, &from, &fromlen); 284 if (cc <= 0) { 285 if (cc < 0 && errno != EWOULDBLOCK) 286 perror("recvfrom"); 287 break; 288 } 289 if (fromlen != sizeof (struct sockaddr_in)) 290 break; 291 rip_input(&from, &inbuf.rip, cc); 292 } 293 } 294 295 int 296 getsocket(domain, type, sin) 297 int domain, type; 298 struct sockaddr_in *sin; 299 { 300 int sock, on = 1; 301 302 if ((sock = socket(domain, type, 0)) < 0) { 303 perror("socket"); 304 syslog(LOG_ERR, "socket: %m"); 305 return (-1); 306 } 307 #ifdef SO_BROADCAST 308 if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) { 309 syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m"); 310 close(sock); 311 return (-1); 312 } 313 #endif 314 #ifdef SO_RCVBUF 315 for (on = bufspace; ; on -= 1024) { 316 if (setsockopt(sock, SOL_SOCKET, SO_RCVBUF, 317 &on, sizeof (on)) == 0) 318 break; 319 if (on <= 8*1024) { 320 syslog(LOG_ERR, "setsockopt SO_RCVBUF: %m"); 321 break; 322 } 323 } 324 if (traceactions) 325 fprintf(ftrace, "recv buf %d\n", on); 326 #endif 327 if (bind(sock, (struct sockaddr *)sin, sizeof (*sin)) < 0) { 328 perror("bind"); 329 syslog(LOG_ERR, "bind: %m"); 330 close(sock); 331 return (-1); 332 } 333 if (fcntl(sock, F_SETFL, O_NONBLOCK) == -1) 334 syslog(LOG_ERR, "fcntl O_NONBLOCK: %m\n"); 335 return (sock); 336 } 337
Indexes created Tue Oct 21 19:09:51 GMT 2025