Commit | Line | Data |
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fdd0ed12 | 1 | #ifndef lint |
9b1c54bf | 2 | static char sccsid[] = "@(#)main.c 4.6 (Berkeley) %G%"; |
fdd0ed12 SL |
3 | #endif |
4 | ||
5 | /* | |
6 | * Routing Table Management Daemon | |
7 | */ | |
7fe7fe74 | 8 | #include "defs.h" |
fdd0ed12 SL |
9 | #include <sys/ioctl.h> |
10 | #include <net/if.h> | |
11 | #include <errno.h> | |
12 | #include <nlist.h> | |
13 | #include <signal.h> | |
14 | #include <time.h> | |
15 | ||
16 | int supplier = -1; /* process should supply updates */ | |
17 | ||
18 | struct rip *msg = (struct rip *)packet; | |
19 | ||
20 | main(argc, argv) | |
21 | int argc; | |
22 | char *argv[]; | |
23 | { | |
24 | int cc; | |
25 | struct sockaddr from; | |
7fe7fe74 SL |
26 | u_char retry; |
27 | #ifdef COMPAT | |
28 | int snoroute; | |
29 | #endif | |
fdd0ed12 SL |
30 | |
31 | argv0 = argv; | |
fdd0ed12 | 32 | sp = getservbyname("router", "udp"); |
7fe7fe74 SL |
33 | if (sp == NULL) { |
34 | fprintf(stderr, "routed: router/udp: unknown service\n"); | |
fdd0ed12 SL |
35 | exit(1); |
36 | } | |
7fe7fe74 SL |
37 | addr.sin_family = AF_INET; |
38 | addr.sin_port = sp->s_port; | |
39 | s = getsocket(AF_INET, SOCK_DGRAM, &addr); | |
40 | if (s < 0) | |
41 | exit(1); | |
42 | #ifdef COMPAT | |
43 | bzero(&addr, sizeof (addr)); | |
44 | addr.sin_family = AF_INET; | |
45 | addr.sin_port = htons(ntohs(sp->s_port) + 1); | |
46 | snoroute = getsocket(AF_INET, SOCK_DGRAM, &addr); | |
47 | if (snoroute < 0) | |
48 | exit(1); | |
49 | #endif | |
fdd0ed12 SL |
50 | argv++, argc--; |
51 | while (argc > 0 && **argv == '-') { | |
d4b6a849 | 52 | if (strcmp(*argv, "-s") == 0) { |
fdd0ed12 SL |
53 | supplier = 1; |
54 | argv++, argc--; | |
55 | continue; | |
56 | } | |
d4b6a849 | 57 | if (strcmp(*argv, "-q") == 0) { |
fdd0ed12 SL |
58 | supplier = 0; |
59 | argv++, argc--; | |
60 | continue; | |
61 | } | |
d4b6a849 SL |
62 | if (strcmp(*argv, "-t") == 0) { |
63 | tracepackets++; | |
64 | argv++, argc--; | |
65 | continue; | |
66 | } | |
67 | fprintf(stderr, "usage: routed [ -s ] [ -q ] [ -t ]\n"); | |
fdd0ed12 SL |
68 | exit(1); |
69 | } | |
d4b6a849 SL |
70 | #ifndef DEBUG |
71 | if (!tracepackets) { | |
72 | int t; | |
73 | ||
74 | if (fork()) | |
75 | exit(0); | |
7620381d SL |
76 | for (t = 0; t < 20; t++) |
77 | if (t != s) | |
78 | #ifdef COMPAT | |
55d340a4 | 79 | if (t != snoroute) |
7620381d SL |
80 | #endif |
81 | (void) close(cc); | |
d4b6a849 SL |
82 | (void) open("/", 0); |
83 | (void) dup2(0, 1); | |
84 | (void) dup2(0, 2); | |
85 | t = open("/dev/tty", 2); | |
86 | if (t >= 0) { | |
87 | ioctl(t, TIOCNOTTY, (char *)0); | |
88 | (void) close(t); | |
89 | } | |
90 | } | |
91 | #endif | |
7fe7fe74 SL |
92 | /* |
93 | * Any extra argument is considered | |
94 | * a tracing log file. | |
95 | */ | |
96 | if (argc > 0) | |
97 | traceon(*argv); | |
fdd0ed12 SL |
98 | /* |
99 | * Collect an initial view of the world by | |
100 | * snooping in the kernel and the gateway kludge | |
101 | * file. Then, send a request packet on all | |
102 | * directly connected networks to find out what | |
103 | * everyone else thinks. | |
104 | */ | |
105 | rtinit(); | |
106 | gwkludge(); | |
107 | ifinit(); | |
108 | if (supplier < 0) | |
109 | supplier = 0; | |
110 | msg->rip_cmd = RIPCMD_REQUEST; | |
55d340a4 | 111 | msg->rip_vers = RIPVERSION; |
fdd0ed12 SL |
112 | msg->rip_nets[0].rip_dst.sa_family = AF_UNSPEC; |
113 | msg->rip_nets[0].rip_metric = HOPCNT_INFINITY; | |
55d340a4 SL |
114 | msg->rip_nets[0].rip_dst.sa_family = htons(AF_UNSPEC); |
115 | msg->rip_nets[0].rip_metric = htonl(HOPCNT_INFINITY); | |
fdd0ed12 SL |
116 | toall(sendmsg); |
117 | sigset(SIGALRM, timer); | |
118 | timer(); | |
119 | ||
fdd0ed12 SL |
120 | for (;;) { |
121 | int ibits; | |
122 | register int n; | |
123 | ||
7fe7fe74 SL |
124 | ibits = 1 << s; |
125 | #ifdef COMPAT | |
126 | ibits |= 1 << snoroute; | |
127 | #endif | |
128 | n = select(20, &ibits, 0, 0, 0); | |
fdd0ed12 SL |
129 | if (n < 0) |
130 | continue; | |
131 | if (ibits & (1 << s)) | |
132 | process(s); | |
7fe7fe74 | 133 | #ifdef COMPAT |
fdd0ed12 SL |
134 | if (ibits & (1 << snoroute)) |
135 | process(snoroute); | |
7fe7fe74 SL |
136 | #endif |
137 | /* handle ICMP redirects */ | |
fdd0ed12 SL |
138 | } |
139 | } | |
140 | ||
141 | process(fd) | |
142 | int fd; | |
143 | { | |
fdd0ed12 | 144 | struct sockaddr from; |
7fe7fe74 | 145 | int fromlen = sizeof (from), cc; |
fdd0ed12 | 146 | |
7fe7fe74 | 147 | cc = recvfrom(fd, packet, sizeof (packet), 0, &from, &fromlen); |
fdd0ed12 SL |
148 | if (cc <= 0) { |
149 | if (cc < 0 && errno != EINTR) | |
7fe7fe74 | 150 | perror("recvfrom"); |
fdd0ed12 SL |
151 | return; |
152 | } | |
7fe7fe74 SL |
153 | if (fromlen != sizeof (struct sockaddr_in)) |
154 | return; | |
fdd0ed12 SL |
155 | sighold(SIGALRM); |
156 | rip_input(&from, cc); | |
157 | sigrelse(SIGALRM); | |
158 | } | |
7fe7fe74 SL |
159 | |
160 | getsocket(domain, type, sin) | |
161 | int domain, type; | |
162 | struct sockaddr_in *sin; | |
163 | { | |
164 | int retry, s; | |
165 | ||
166 | retry = 1; | |
167 | while ((s = socket(domain, type, 0, 0)) < 0 && retry) { | |
168 | perror("socket"); | |
169 | sleep(5 * retry); | |
170 | retry <<= 1; | |
171 | } | |
172 | if (retry == 0) | |
173 | return (-1); | |
174 | while (bind(s, sin, sizeof (*sin), 0) < 0 && retry) { | |
175 | perror("bind"); | |
176 | sleep(5 * retry); | |
177 | retry <<= 1; | |
178 | } | |
179 | if (retry == 0) | |
180 | return (-1); | |
181 | return (s); | |
182 | } |