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1.1 root 1: #ifndef lint
2: static char sccsid[] = "@(#)main.c 4.8 (Berkeley) 7/1/83";
3: #endif
4:
5: /*
6: * Routing Table Management Daemon
7: */
8: #include "defs.h"
9: #include <sys/ioctl.h>
10: #include <sys/time.h>
11:
12: #include <net/if.h>
13:
14: #include <errno.h>
15: #include <nlist.h>
16: #include <signal.h>
17:
18: int supplier = -1; /* process should supply updates */
19:
20: struct rip *msg = (struct rip *)packet;
21:
22: main(argc, argv)
23: int argc;
24: char *argv[];
25: {
26: int cc;
27: struct sockaddr from;
28: u_char retry;
29: #ifdef COMPAT
30: int snoroute;
31: #endif
32:
33: argv0 = argv;
34: sp = getservbyname("router", "udp");
35: if (sp == NULL) {
36: fprintf(stderr, "routed: router/udp: unknown service\n");
37: exit(1);
38: }
39: addr.sin_family = AF_INET;
40: addr.sin_port = sp->s_port;
41: s = getsocket(AF_INET, SOCK_DGRAM, &addr);
42: if (s < 0)
43: exit(1);
44: #ifdef COMPAT
45: bzero(&addr, sizeof (addr));
46: addr.sin_family = AF_INET;
47: addr.sin_port = htons(ntohs(sp->s_port) + 1);
48: snoroute = getsocket(AF_INET, SOCK_DGRAM, &addr);
49: if (snoroute < 0)
50: exit(1);
51: #endif
52: argv++, argc--;
53: while (argc > 0 && **argv == '-') {
54: if (strcmp(*argv, "-s") == 0) {
55: supplier = 1;
56: argv++, argc--;
57: continue;
58: }
59: if (strcmp(*argv, "-q") == 0) {
60: supplier = 0;
61: argv++, argc--;
62: continue;
63: }
64: if (strcmp(*argv, "-t") == 0) {
65: tracepackets++;
66: argv++, argc--;
67: continue;
68: }
69: fprintf(stderr, "usage: routed [ -s ] [ -q ] [ -t ]\n");
70: exit(1);
71: }
72: #ifndef DEBUG
73: if (!tracepackets) {
74: int t;
75:
76: if (fork())
77: exit(0);
78: for (t = 0; t < 20; t++)
79: if (t != s)
80: #ifdef COMPAT
81: if (t != snoroute)
82: #endif
83: (void) close(cc);
84: (void) open("/", 0);
85: (void) dup2(0, 1);
86: (void) dup2(0, 2);
87: t = open("/dev/tty", 2);
88: if (t >= 0) {
89: ioctl(t, TIOCNOTTY, (char *)0);
90: (void) close(t);
91: }
92: }
93: #endif
94: /*
95: * Any extra argument is considered
96: * a tracing log file.
97: */
98: if (argc > 0)
99: traceon(*argv);
100: /*
101: * Collect an initial view of the world by
102: * snooping in the kernel and the gateway kludge
103: * file. Then, send a request packet on all
104: * directly connected networks to find out what
105: * everyone else thinks.
106: */
107: rtinit();
108: gwkludge();
109: ifinit();
110: if (supplier < 0)
111: supplier = 0;
112: msg->rip_cmd = RIPCMD_REQUEST;
113: msg->rip_vers = RIPVERSION;
114: msg->rip_nets[0].rip_dst.sa_family = AF_UNSPEC;
115: msg->rip_nets[0].rip_metric = HOPCNT_INFINITY;
116: msg->rip_nets[0].rip_dst.sa_family = htons(AF_UNSPEC);
117: msg->rip_nets[0].rip_metric = htonl(HOPCNT_INFINITY);
118: toall(sendmsg);
119: signal(SIGALRM, timer);
120: timer();
121:
122: for (;;) {
123: int ibits;
124: register int n;
125:
126: ibits = 1 << s;
127: #ifdef COMPAT
128: ibits |= 1 << snoroute;
129: #endif
130: n = select(20, &ibits, 0, 0, 0);
131: if (n < 0)
132: continue;
133: if (ibits & (1 << s))
134: process(s);
135: #ifdef COMPAT
136: if (ibits & (1 << snoroute))
137: process(snoroute);
138: #endif
139: /* handle ICMP redirects */
140: }
141: }
142:
143: process(fd)
144: int fd;
145: {
146: struct sockaddr from;
147: int fromlen = sizeof (from), cc, omask;
148:
149: cc = recvfrom(fd, packet, sizeof (packet), 0, &from, &fromlen);
150: if (cc <= 0) {
151: if (cc < 0 && errno != EINTR)
152: perror("recvfrom");
153: return;
154: }
155: if (fromlen != sizeof (struct sockaddr_in))
156: return;
157: #define mask(s) (1<<((s)-1))
158: omask = sigblock(mask(SIGALRM));
159: rip_input(&from, cc);
160: sigsetmask(omask);
161: }
162:
163: getsocket(domain, type, sin)
164: int domain, type;
165: struct sockaddr_in *sin;
166: {
167: int retry, s;
168:
169: retry = 1;
170: while ((s = socket(domain, type, 0, 0)) < 0 && retry) {
171: perror("socket");
172: sleep(5 * retry);
173: retry <<= 1;
174: }
175: if (retry == 0)
176: return (-1);
177: while (bind(s, sin, sizeof (*sin), 0) < 0 && retry) {
178: perror("bind");
179: sleep(5 * retry);
180: retry <<= 1;
181: }
182: if (retry == 0)
183: return (-1);
184: return (s);
185: }
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