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1.1 root 1: /*
2: * Copyright (c) 1983, 1988 Regents of the University of California.
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms are permitted
6: * provided that this notice is preserved and that due credit is given
7: * to the University of California at Berkeley. The name of the University
8: * may not be used to endorse or promote products derived from this
9: * software without specific prior written permission. This software
10: * is provided ``as is'' without express or implied warranty.
11: */
12:
13: #ifndef lint
14: char copyright[] =
15: "@(#) Copyright (c) 1983, 1988 Regents of the University of California.\n\
16: All rights reserved.\n";
17: #endif /* not lint */
18:
19: #ifndef lint
20: static char sccsid[] = "@(#)main.c 5.13 (Berkeley) 5/31/88";
21: #endif /* not lint */
22:
23: /*
24: * Routing Table Management Daemon
25: */
26: #include "defs.h"
27: #include <sys/ioctl.h>
28: #include <sys/time.h>
29:
30: #include <net/if.h>
31:
32: #include <sys/errno.h>
33: #include <sys/signal.h>
34: #include <sys/syslog.h>
35:
36: int supplier = -1; /* process should supply updates */
37: int gateway = 0; /* 1 if we are a gateway to parts beyond */
38: int debug = 0;
39:
40: struct rip *msg = (struct rip *)packet;
41: int hup(), rtdeleteall(), sigtrace();
42:
43: main(argc, argv)
44: int argc;
45: char *argv[];
46: {
47: int cc;
48: struct sockaddr from;
49: u_char retry;
50:
51: argv0 = argv;
52: openlog("routed", LOG_PID | LOG_ODELAY, LOG_DAEMON);
53: setlogmask(LOG_UPTO(LOG_WARNING));
54: sp = getservbyname("router", "udp");
55: if (sp == NULL) {
56: fprintf(stderr, "routed: router/udp: unknown service\n");
57: exit(1);
58: }
59: addr.sin_family = AF_INET;
60: addr.sin_port = sp->s_port;
61: s = getsocket(AF_INET, SOCK_DGRAM, &addr);
62: if (s < 0)
63: exit(1);
64: argv++, argc--;
65: while (argc > 0 && **argv == '-') {
66: if (strcmp(*argv, "-s") == 0) {
67: supplier = 1;
68: argv++, argc--;
69: continue;
70: }
71: if (strcmp(*argv, "-q") == 0) {
72: supplier = 0;
73: argv++, argc--;
74: continue;
75: }
76: if (strcmp(*argv, "-t") == 0) {
77: if (tracehistory == 0)
78: tracehistory++;
79: else {
80: tracehistory = 0;
81: tracepackets++;
82: }
83: setlogmask(LOG_UPTO(LOG_DEBUG));
84: argv++, argc--;
85: continue;
86: }
87: if (strcmp(*argv, "-d") == 0) {
88: debug++;
89: setlogmask(LOG_UPTO(LOG_DEBUG));
90: argv++, argc--;
91: continue;
92: }
93: if (strcmp(*argv, "-g") == 0) {
94: gateway = 1;
95: argv++, argc--;
96: continue;
97: }
98: fprintf(stderr,
99: "usage: routed [ -s ] [ -q ] [ -t ] [ -g ]\n");
100: exit(1);
101: }
102: if (tracepackets == 0 && debug == 0) {
103: int t;
104:
105: if (fork())
106: exit(0);
107: for (t = 0; t < 20; t++)
108: if (t != s)
109: (void) close(t);
110: (void) open("/", 0);
111: (void) dup2(0, 1);
112: (void) dup2(0, 2);
113: t = open("/dev/tty", 2);
114: if (t >= 0) {
115: ioctl(t, TIOCNOTTY, (char *)0);
116: (void) close(t);
117: }
118: }
119: /*
120: * Any extra argument is considered
121: * a tracing log file.
122: */
123: if (argc > 0)
124: traceon(*argv);
125: /*
126: * Collect an initial view of the world by
127: * checking the interface configuration and the gateway kludge
128: * file. Then, send a request packet on all
129: * directly connected networks to find out what
130: * everyone else thinks.
131: */
132: rtinit();
133: ifinit();
134: gwkludge();
135: if (gateway > 0)
136: rtdefault();
137: if (supplier < 0)
138: supplier = 0;
139: msg->rip_cmd = RIPCMD_REQUEST;
140: msg->rip_vers = RIPVERSION;
141: msg->rip_nets[0].rip_dst.sa_family = AF_UNSPEC;
142: msg->rip_nets[0].rip_metric = HOPCNT_INFINITY;
143: msg->rip_nets[0].rip_dst.sa_family = htons(AF_UNSPEC);
144: msg->rip_nets[0].rip_metric = htonl(HOPCNT_INFINITY);
145: toall(sendmsg);
146: signal(SIGALRM, timer);
147: signal(SIGHUP, hup);
148: signal(SIGTERM, hup);
149: signal(SIGINT, rtdeleteall);
150: signal(SIGUSR1, sigtrace);
151: signal(SIGUSR2, sigtrace);
152: timer();
153:
154: for (;;) {
155: int ibits;
156: register int n;
157:
158: ibits = 1 << s;
159: n = select(20, &ibits, 0, 0, 0);
160: if (n < 0)
161: continue;
162: if (ibits & (1 << s))
163: process(s);
164: /* handle ICMP redirects */
165: }
166: }
167:
168: process(fd)
169: int fd;
170: {
171: struct sockaddr from;
172: int fromlen = sizeof (from), cc, omask;
173: time_t now;
174:
175: cc = recvfrom(fd, packet, sizeof (packet), 0, &from, &fromlen);
176: if (cc <= 0) {
177: if (cc < 0 && errno != EINTR)
178: perror("recvfrom");
179: return;
180: }
181: if (fromlen != sizeof (struct sockaddr_in))
182: return;
183: if (traceactions && !tracepackets) {
184: (void) time(&now);
185: curtime = ctime(&now);
186: }
187: omask = sigblock(sigmask(SIGALRM));
188: rip_input(&from, cc);
189: sigsetmask(omask);
190: }
191:
192: getsocket(domain, type, sin)
193: int domain, type;
194: struct sockaddr_in *sin;
195: {
196: int s, on = 1;
197:
198: if ((s = socket(domain, type, 0)) < 0) {
199: perror("socket");
200: syslog(LOG_ERR, "socket: %m");
201: return (-1);
202: }
203: if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) {
204: syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m");
205: close(s);
206: return (-1);
207: }
208: on = 48*1024;
209: if (setsockopt(s, SOL_SOCKET, SO_RCVBUF, &on, sizeof (on)) < 0)
210: syslog(LOG_ERR, "setsockopt SO_RCVBUF: %m");
211: if (bind(s, sin, sizeof (*sin), 0) < 0) {
212: perror("bind");
213: syslog(LOG_ERR, "bind: %m");
214: close(s);
215: return (-1);
216: }
217: return (s);
218: }
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