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Annotation of 43BSDReno/sbin/XNSrouted/main.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1985 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * This file includes significant work done at Cornell University by
        !             6:  * Bill Nesheim.  That work included by permission.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms are permitted provided
        !             9:  * that: (1) source distributions retain this entire copyright notice and
        !            10:  * comment, and (2) distributions including binaries display the following
        !            11:  * acknowledgement:  ``This product includes software developed by the
        !            12:  * University of California, Berkeley and its contributors'' in the
        !            13:  * documentation or other materials provided with the distribution and in
        !            14:  * all advertising materials mentioning features or use of this software.
        !            15:  * Neither the name of the University nor the names of its contributors may
        !            16:  * be used to endorse or promote products derived from this software without
        !            17:  * specific prior written permission.
        !            18:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            19:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            20:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            21:  */
        !            22: 
        !            23: #ifndef lint
        !            24: char copyright[] =
        !            25: "@(#) Copyright (c) 1985 The Regents of the University of California.\n\
        !            26:  All rights reserved.\n";
        !            27: #endif /* not lint */
        !            28: 
        !            29: #ifndef lint
        !            30: static char sccsid[] = "@(#)main.c     5.10 (Berkeley) 6/29/90";
        !            31: #endif /* not lint */
        !            32: 
        !            33: /*
        !            34:  * XNS Routing Information Protocol Daemon
        !            35:  */
        !            36: #include "defs.h"
        !            37: #include <sys/ioctl.h>
        !            38: #include <sys/time.h>
        !            39: 
        !            40: #include <net/if.h>
        !            41: 
        !            42: #include <errno.h>
        !            43: #include <nlist.h>
        !            44: #include <signal.h>
        !            45: #include <paths.h>
        !            46: 
        !            47: int    supplier = -1;          /* process should supply updates */
        !            48: extern int gateway;
        !            49: 
        !            50: struct rip *msg = (struct rip *) &packet[sizeof (struct idp)]; 
        !            51: int    hup(), fkexit();
        !            52: 
        !            53: main(argc, argv)
        !            54:        int argc;
        !            55:        char *argv[];
        !            56: {
        !            57:        int cc;
        !            58:        struct sockaddr from;
        !            59:        u_char retry;
        !            60:        
        !            61:        argv0 = argv;
        !            62:        argv++, argc--;
        !            63:        while (argc > 0 && **argv == '-') {
        !            64:                if (strcmp(*argv, "-s") == 0) {
        !            65:                        supplier = 1;
        !            66:                        argv++, argc--;
        !            67:                        continue;
        !            68:                }
        !            69:                if (strcmp(*argv, "-q") == 0) {
        !            70:                        supplier = 0;
        !            71:                        argv++, argc--;
        !            72:                        continue;
        !            73:                }
        !            74:                if (strcmp(*argv, "-R") == 0) {
        !            75:                        noteremoterequests++;
        !            76:                        argv++, argc--;
        !            77:                        continue;
        !            78:                }
        !            79:                if (strcmp(*argv, "-t") == 0) {
        !            80:                        tracepackets++;
        !            81:                        argv++, argc--;
        !            82:                        ftrace = stderr;
        !            83:                        tracing = 1; 
        !            84:                        continue;
        !            85:                }
        !            86:                if (strcmp(*argv, "-g") == 0) {
        !            87:                        gateway = 1;
        !            88:                        argv++, argc--;
        !            89:                        continue;
        !            90:                }
        !            91:                if (strcmp(*argv, "-l") == 0) {
        !            92:                        gateway = -1;
        !            93:                        argv++, argc--;
        !            94:                        continue;
        !            95:                }
        !            96:                fprintf(stderr,
        !            97:                        "usage: xnsrouted [ -s ] [ -q ] [ -t ] [ -g ] [ -l ]\n");
        !            98:                exit(1);
        !            99:        }
        !           100:        
        !           101:        
        !           102: #ifndef DEBUG
        !           103:        if (!tracepackets)
        !           104:                daemon(0, 0);
        !           105: #endif
        !           106:        openlog("XNSrouted", LOG_PID, LOG_DAEMON);
        !           107: 
        !           108:        ns_anynet.s_net[0] = -1; ns_anynet.s_net[1] = -1;
        !           109:        addr.sns_family = AF_NS;
        !           110:        addr.sns_len = sizeof(addr);
        !           111:        addr.sns_port = htons(IDPPORT_RIF);
        !           112:        s = getsocket(SOCK_DGRAM, 0, &addr);
        !           113:        if (s < 0)
        !           114:                exit(1);
        !           115:        /*
        !           116:         * Any extra argument is considered
        !           117:         * a tracing log file.
        !           118:         */
        !           119:        if (argc > 0)
        !           120:                traceon(*argv);
        !           121:        /*
        !           122:         * Collect an initial view of the world by
        !           123:         * snooping in the kernel.  Then, send a request packet on all
        !           124:         * directly connected networks to find out what
        !           125:         * everyone else thinks.
        !           126:         */
        !           127:        rtinit();
        !           128:        ifinit();
        !           129:        if (supplier < 0)
        !           130:                supplier = 0;
        !           131:        /* request the state of the world */
        !           132:        msg->rip_cmd = htons(RIPCMD_REQUEST);
        !           133:        msg->rip_nets[0].rip_dst = ns_anynet;
        !           134:        msg->rip_nets[0].rip_metric =  htons(HOPCNT_INFINITY);
        !           135:        toall(sendmsg);
        !           136:        signal(SIGALRM, timer);
        !           137:        signal(SIGHUP, hup);
        !           138:        signal(SIGINT, hup);
        !           139:        signal(SIGEMT, fkexit);
        !           140:        timer();
        !           141:        
        !           142: 
        !           143:        for (;;) 
        !           144:                process(s);
        !           145:        
        !           146: }
        !           147: 
        !           148: process(fd)
        !           149:        int fd;
        !           150: {
        !           151:        struct sockaddr from;
        !           152:        int fromlen = sizeof (from), cc, omask;
        !           153:        struct idp *idp = (struct idp *)packet;
        !           154: 
        !           155:        cc = recvfrom(fd, packet, sizeof (packet), 0, &from, &fromlen);
        !           156:        if (cc <= 0) {
        !           157:                if (cc < 0 && errno != EINTR)
        !           158:                        syslog("recvfrom: %m");
        !           159:                return;
        !           160:        }
        !           161:        if (tracepackets > 1 && ftrace) {
        !           162:            fprintf(ftrace,"rcv %d bytes on %s ", cc, xns_ntoa(&idp->idp_dna));
        !           163:            fprintf(ftrace," from %s\n", xns_ntoa(&idp->idp_sna));
        !           164:        }
        !           165:        
        !           166:        if (noteremoterequests && !ns_neteqnn(idp->idp_sna.x_net, ns_zeronet)
        !           167:                && !ns_neteq(idp->idp_sna, idp->idp_dna))
        !           168:        {
        !           169:                syslog(LOG_ERR,
        !           170:                       "net of interface (%s) != net on ether (%s)!\n",
        !           171:                       xns_nettoa(idp->idp_dna.x_net),
        !           172:                       xns_nettoa(idp->idp_sna.x_net));
        !           173:        }
        !           174:                        
        !           175:        /* We get the IDP header in front of the RIF packet*/
        !           176:        cc -= sizeof (struct idp);
        !           177: #define        mask(s) (1<<((s)-1))
        !           178:        omask = sigblock(mask(SIGALRM));
        !           179:        rip_input(&from, cc);
        !           180:        sigsetmask(omask);
        !           181: }
        !           182: 
        !           183: getsocket(type, proto, sns)
        !           184:        int type, proto; 
        !           185:        struct sockaddr_ns *sns;
        !           186: {
        !           187:        int domain = sns->sns_family;
        !           188:        int retry, s, on = 1;
        !           189: 
        !           190:        retry = 1;
        !           191:        while ((s = socket(domain, type, proto)) < 0 && retry) {
        !           192:                syslog("socket: %m");
        !           193:                sleep(5 * retry);
        !           194:                retry <<= 1;
        !           195:        }
        !           196:        if (retry == 0)
        !           197:                return (-1);
        !           198:        while (bind(s, sns, sizeof (*sns), 0) < 0 && retry) {
        !           199:                syslog("bind: %m");
        !           200:                sleep(5 * retry);
        !           201:                retry <<= 1;
        !           202:        }
        !           203:        if (retry == 0)
        !           204:                return (-1);
        !           205:        if (domain==AF_NS) {
        !           206:                struct idp idp;
        !           207:                if (setsockopt(s, 0, SO_HEADERS_ON_INPUT, &on, sizeof(on))) {
        !           208:                        syslog("setsockopt SEE HEADERS: %m");
        !           209:                        exit(1);
        !           210:                }
        !           211:                idp.idp_pt = NSPROTO_RI;
        !           212:                if (setsockopt(s, 0, SO_DEFAULT_HEADERS, &idp, sizeof(idp))) {
        !           213:                        syslog("setsockopt SET HEADER: %m");
        !           214:                        exit(1);
        !           215:                }
        !           216:        }
        !           217:        if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) {
        !           218:                syslog("setsockopt SO_BROADCAST: %m");
        !           219:                exit(1);
        !           220:        }
        !           221:        return (s);
        !           222: }
        !           223: 
        !           224: /*
        !           225:  * Fork and exit on EMT-- for profiling.
        !           226:  */
        !           227: fkexit()
        !           228: {
        !           229:        if (fork() == 0)
        !           230:                exit(0);
        !           231: }

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