usr.sbin/IPXrouted/main.c

   1 /*
   2  * Copyright (c) 1985, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Copyright (c) 1995 John Hay.  All rights reserved.
   6  *
   7  * This file includes significant work done at Cornell University by
   8  * Bill Nesheim.  That work included by permission.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  *
  38  * $FreeBSD: src/usr.sbin/IPXrouted/main.c,v 1.10 1999/08/28 01:15:03 peter Exp $
  39  * $DragonFly: src/usr.sbin/IPXrouted/main.c,v 1.4 2007/05/18 17:05:12 dillon Exp $
  40  *
  41  * @(#) Copyright (c) 1985, 1993 The Regents of the University of California.  All rights reserved.
  42  * @(#)main.c   8.1 (Berkeley) 6/5/93
  43  */
  44
  45 /*
  46  * IPX Routing Information Protocol Daemon
  47  */
  48 #include "defs.h"
  49 #include <sys/time.h>
  50
  51 #include <net/if.h>
  52
  53 #include <errno.h>
  54 #include <nlist.h>
  55 #include <signal.h>
  56 #include <paths.h>
  57 #include <stdlib.h>
  58 #include <unistd.h>
  59
  60 #define SAP_PKT         0
  61 #define RIP_PKT         1
  62
  63 struct  sockaddr_ipx addr;      /* Daemon's Address */
  64 int     ripsock;                /* RIP Socket to listen on */
  65 int     sapsock;                /* SAP Socket to listen on */
  66 int     kmem;
  67 int     install;                /* if 1 call kernel */
  68 int     lookforinterfaces;      /* if 1 probe kernel for new up interfaces */
  69 int     performnlist;           /* if 1 check if /kernel has changed */
  70 int     externalinterfaces;     /* # of remote and local interfaces */
  71 int     timeval;                /* local idea of time */
  72 int     noteremoterequests;     /* squawk on requests from non-local nets */
  73 int     r;                      /* Routing socket to install updates with */
  74 struct  sockaddr_ipx ipx_netmask;       /* Used in installing routes */
  75
  76 char    packet[MAXRXPACKETSIZE+1];
  77
  78 char    **argv0;
  79
  80 int     supplier = -1;          /* process should supply updates */
  81 int     dosap = 1;              /* By default do SAP services. */
  82 int     dobcast = 1;            /* A RIP/SAP broadcast is needed. */
  83 time_t  lastbcast;              /* Time of last RIP/SAP broadcast */
  84
  85 struct  rip *msg = (struct rip *) &packet[sizeof (struct ipx)];
  86 struct  sap_packet *sap_msg =
  87                 (struct sap_packet *) &packet[sizeof (struct ipx)];
  88 void    hup(), fkexit(), timer();
  89 void    process(int fd, int pkt_type);
  90 int     getsocket(int type, int proto, struct sockaddr_ipx *sipx);
  91 void    getinfo();
  92 void    catchtimer();
  93
  94 int
  95 main(int argc, char *argv[])
  96 {
  97         int nfds;
  98         fd_set fdvar;
  99         time_t ttime;
 100         struct itimerval tval;
 101
 102         argv0 = argv;
 103         argv++, argc--;
 104         while (argc > 0 && **argv == '-') {
 105                 if (strcmp(*argv, "-s") == 0) {
 106                         supplier = 1;
 107                         argv++, argc--;
 108                         continue;
 109                 }
 110                 if (strcmp(*argv, "-q") == 0) {
 111                         supplier = 0;
 112                         argv++, argc--;
 113                         continue;
 114                 }
 115                 if (strcmp(*argv, "-R") == 0) {
 116                         noteremoterequests++;
 117                         argv++, argc--;
 118                         continue;
 119                 }
 120                 if (strcmp(*argv, "-S") == 0) {
 121                         dosap = 0;
 122                         argv++, argc--;
 123                         continue;
 124                 }
 125                 if (strcmp(*argv, "-t") == 0) {
 126                         tracepackets++;
 127                         argv++, argc--;
 128                         ftrace = stderr;
 129                         tracing = 1;
 130                         continue;
 131                 }
 132                 if (strcmp(*argv, "-g") == 0) {
 133                         gateway = 1;
 134                         argv++, argc--;
 135                         continue;
 136                 }
 137                 if (strcmp(*argv, "-l") == 0) {
 138                         gateway = -1;
 139                         argv++, argc--;
 140                         continue;
 141                 }
 142                 if (strcmp(*argv, "-N") == 0) {
 143                         dognreply = 0;
 144                         argv++, argc--;
 145                         continue;
 146                 }
 147                 fprintf(stderr,
 148                         "usage: ipxrouted [ -s ] [ -q ] [ -t ] [ -g ] [ -l ] [ -N ]\n");
 149                 exit(1);
 150         }
 151
 152
 153 #ifndef DEBUG
 154         if (!tracepackets)
 155                 daemon(0, 0);
 156 #endif
 157         openlog("IPXrouted", LOG_PID, LOG_DAEMON);
 158
 159         addr.sipx_family = AF_IPX;
 160         addr.sipx_len = sizeof(addr);
 161         addr.sipx_port = htons(IPXPORT_RIP);
 162         ipx_anynet.s_net[0] = ipx_anynet.s_net[1] = -1;
 163         ipx_netmask.sipx_addr.x_net = ipx_anynet;
 164         ipx_netmask.sipx_len = 6;
 165         ipx_netmask.sipx_family = AF_IPX;
 166         r = socket(AF_ROUTE, SOCK_RAW, 0);
 167         /* later, get smart about lookingforinterfaces */
 168         if (r)
 169                 shutdown(r, SHUT_RD); /* for now, don't want reponses */
 170         else {
 171                 fprintf(stderr, "IPXrouted: no routing socket\n");
 172                 exit(1);
 173         }
 174         ripsock = getsocket(SOCK_DGRAM, 0, &addr);
 175         if (ripsock < 0)
 176                 exit(1);
 177
 178         if (dosap) {
 179                 addr.sipx_port = htons(IPXPORT_SAP);
 180                 sapsock = getsocket(SOCK_DGRAM, 0, &addr);
 181                 if (sapsock < 0)
 182                         exit(1);
 183         } else
 184                 sapsock = -1;
 185
 186         /*
 187          * Any extra argument is considered
 188          * a tracing log file.
 189          */
 190         if (argc > 0)
 191                 traceon(*argv);
 192         /*
 193          * Collect an initial view of the world by
 194          * snooping in the kernel.  Then, send a request packet on all
 195          * directly connected networks to find out what
 196          * everyone else thinks.
 197          */
 198         rtinit();
 199         sapinit();
 200         ifinit();
 201         if (supplier < 0)
 202                 supplier = 0;
 203         /* request the state of the world */
 204         msg->rip_cmd = htons(RIPCMD_REQUEST);
 205         msg->rip_nets[0].rip_dst = ipx_anynet;
 206         msg->rip_nets[0].rip_metric =  htons(HOPCNT_INFINITY);
 207         msg->rip_nets[0].rip_ticks =  htons(-1);
 208         toall(sndmsg, NULL, 0);
 209
 210         if (dosap) {
 211                 sap_msg->sap_cmd = htons(SAP_REQ);
 212                 sap_msg->sap[0].ServType = htons(SAP_WILDCARD);
 213                 toall(sapsndmsg, NULL, 0);
 214         }
 215
 216         signal(SIGALRM, catchtimer);
 217         signal(SIGHUP, hup);
 218         signal(SIGINT, hup);
 219         signal(SIGEMT, fkexit);
 220         signal(SIGINFO, getinfo);
 221
 222         tval.it_interval.tv_sec = TIMER_RATE;
 223         tval.it_interval.tv_usec = 0;
 224         tval.it_value.tv_sec = TIMER_RATE;
 225         tval.it_value.tv_usec = 0;
 226         setitimer(ITIMER_REAL, &tval, NULL);
 227
 228         nfds = 1 + max(sapsock, ripsock);
 229
 230         for (;;) {
 231                 if (dobcast) {
 232                         dobcast = 0;
 233                         lastbcast = time(NULL);
 234                         timer();
 235                 }
 236
 237                 FD_ZERO(&fdvar);
 238                 if (dosap) {
 239                         FD_SET(sapsock, &fdvar);
 240                 }
 241                 FD_SET(ripsock, &fdvar);
 242
 243                 if(select(nfds, &fdvar, NULL, NULL, NULL) < 0) {
 244                         if(errno == EINTR)
 245                                 continue;
 246                         perror("during select");
 247                         exit(1);
 248                 }
 249
 250                 if(FD_ISSET(ripsock, &fdvar))
 251                         process(ripsock, RIP_PKT);
 252
 253                 if(dosap && FD_ISSET(sapsock, &fdvar))
 254                         process(sapsock, SAP_PKT);
 255
 256                 ttime = time(NULL);
 257                 if (ttime > (lastbcast + TIMER_RATE + (TIMER_RATE * 2 / 3))) {
 258                         dobcast = 1;
 259                         syslog(LOG_ERR, "Missed alarm");
 260                 }
 261         }
 262 }
 263
 264 void
 265 process(int fd, int pkt_type)
 266 {
 267         struct sockaddr from;
 268         int fromlen = sizeof (from), cc, omask;
 269         struct ipx *ipxdp = (struct ipx *)packet;
 270
 271         cc = recvfrom(fd, packet, sizeof (packet), 0, &from, &fromlen);
 272         if (cc <= 0) {
 273                 if (cc < 0 && errno != EINTR)
 274                         syslog(LOG_ERR, "recvfrom: %m");
 275                 return;
 276         }
 277         if (tracepackets > 1 && ftrace) {
 278             fprintf(ftrace,"rcv %d bytes on %s ",
 279                     cc, ipxdp_ntoa(&ipxdp->ipx_dna));
 280             fprintf(ftrace," from %s\n", ipxdp_ntoa(&ipxdp->ipx_sna));
 281         }
 282
 283         if (noteremoterequests &&
 284             !ipx_neteqnn(ipxdp->ipx_sna.x_net, ipx_zeronet) &&
 285             !ipx_neteq(ipxdp->ipx_sna, ipxdp->ipx_dna))
 286         {
 287                 syslog(LOG_ERR,
 288                        "net of interface (%s) != net on ether (%s)!\n",
 289                        ipxdp_nettoa(ipxdp->ipx_dna.x_net),
 290                        ipxdp_nettoa(ipxdp->ipx_sna.x_net));
 291         }
 292
 293         /* We get the IPX header in front of the RIF packet*/
 294         cc -= sizeof (struct ipx);
 295 #define mask(s) (1<<((s)-1))
 296         omask = sigblock(mask(SIGALRM));
 297         switch(pkt_type) {
 298                 case SAP_PKT: sap_input(&from, cc);
 299                                 break;
 300                 case RIP_PKT: rip_input(&from, cc);
 301                                 break;
 302         }
 303         sigsetmask(omask);
 304 }
 305
 306 int
 307 getsocket(int type, int proto, struct sockaddr_ipx *sipx)
 308 {
 309         int domain = sipx->sipx_family;
 310         int retry, s, on = 1;
 311
 312         retry = 1;
 313         while ((s = socket(domain, type, proto)) < 0 && retry) {
 314                 syslog(LOG_ERR, "socket: %m");
 315                 sleep(5 * retry);
 316                 retry <<= 1;
 317         }
 318         if (retry == 0)
 319                 return (-1);
 320         while (bind(s, (struct sockaddr *)sipx, sizeof (*sipx)) < 0 && retry) {
 321                 syslog(LOG_ERR, "bind: %m");
 322                 sleep(5 * retry);
 323                 retry <<= 1;
 324         }
 325         if (retry == 0)
 326                 return (-1);
 327         if (domain==AF_IPX) {
 328                 struct ipx ipxdp;
 329                 if (setsockopt(s, 0, SO_HEADERS_ON_INPUT, &on, sizeof(on))) {
 330                         syslog(LOG_ERR, "setsockopt SEE HEADERS: %m");
 331                         exit(1);
 332                 }
 333                 if (ntohs(sipx->sipx_addr.x_port) == IPXPORT_RIP)
 334                         ipxdp.ipx_pt = IPXPROTO_RI;
 335                 else if (ntohs(sipx->sipx_addr.x_port) == IPXPORT_SAP)
 336 #ifdef IPXPROTO_SAP
 337                         ipxdp.ipx_pt = IPXPROTO_SAP;
 338 #else
 339                         ipxdp.ipx_pt = IPXPROTO_PXP;
 340 #endif
 341                 else {
 342                         syslog(LOG_ERR, "port should be either RIP or SAP");
 343                         exit(1);
 344                 }
 345                 if (setsockopt(s, 0, SO_DEFAULT_HEADERS, &ipxdp, sizeof(ipxdp))) {
 346                         syslog(LOG_ERR, "setsockopt SET HEADER: %m");
 347                         exit(1);
 348                 }
 349         }
 350         if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) {
 351                 syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m");
 352                 exit(1);
 353         }
 354         return (s);
 355 }
 356
 357 /*
 358  * Fork and exit on EMT-- for profiling.
 359  */
 360 void
 361 fkexit(void)
 362 {
 363         if (fork() == 0)
 364                 exit(0);
 365 }
 366
 367 void
 368 catchtimer(void)
 369 {
 370         dobcast = 1;
 371 }
 372
 373 void
 374 getinfo(void)
 375 {
 376         FILE *fh;
 377
 378         fh = fopen("/var/log/ipxrouted.dmp", "a");
 379         if(fh == NULL)
 380                 return;
 381
 382         dumpriptable(fh);
 383         dumpsaptable(fh, sap_head);
 384
 385         fclose(fh);
 386 }
 387