Commit | Line | Data |
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fdd0ed12 | 1 | #ifndef lint |
d4b6a849 | 2 | static char sccsid[] = "@(#)main.c 4.3 %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); | |
76 | for (cc = 0; cc < 10; cc++) | |
77 | (void) close(cc); | |
78 | (void) open("/", 0); | |
79 | (void) dup2(0, 1); | |
80 | (void) dup2(0, 2); | |
81 | t = open("/dev/tty", 2); | |
82 | if (t >= 0) { | |
83 | ioctl(t, TIOCNOTTY, (char *)0); | |
84 | (void) close(t); | |
85 | } | |
86 | } | |
87 | #endif | |
7fe7fe74 SL |
88 | /* |
89 | * Any extra argument is considered | |
90 | * a tracing log file. | |
91 | */ | |
92 | if (argc > 0) | |
93 | traceon(*argv); | |
fdd0ed12 SL |
94 | /* |
95 | * Collect an initial view of the world by | |
96 | * snooping in the kernel and the gateway kludge | |
97 | * file. Then, send a request packet on all | |
98 | * directly connected networks to find out what | |
99 | * everyone else thinks. | |
100 | */ | |
101 | rtinit(); | |
102 | gwkludge(); | |
103 | ifinit(); | |
104 | if (supplier < 0) | |
105 | supplier = 0; | |
106 | msg->rip_cmd = RIPCMD_REQUEST; | |
107 | msg->rip_nets[0].rip_dst.sa_family = AF_UNSPEC; | |
108 | msg->rip_nets[0].rip_metric = HOPCNT_INFINITY; | |
109 | toall(sendmsg); | |
110 | sigset(SIGALRM, timer); | |
111 | timer(); | |
112 | ||
fdd0ed12 SL |
113 | for (;;) { |
114 | int ibits; | |
115 | register int n; | |
116 | ||
7fe7fe74 SL |
117 | ibits = 1 << s; |
118 | #ifdef COMPAT | |
119 | ibits |= 1 << snoroute; | |
120 | #endif | |
121 | n = select(20, &ibits, 0, 0, 0); | |
fdd0ed12 SL |
122 | if (n < 0) |
123 | continue; | |
124 | if (ibits & (1 << s)) | |
125 | process(s); | |
7fe7fe74 | 126 | #ifdef COMPAT |
fdd0ed12 SL |
127 | if (ibits & (1 << snoroute)) |
128 | process(snoroute); | |
7fe7fe74 SL |
129 | #endif |
130 | /* handle ICMP redirects */ | |
fdd0ed12 SL |
131 | } |
132 | } | |
133 | ||
134 | process(fd) | |
135 | int fd; | |
136 | { | |
fdd0ed12 | 137 | struct sockaddr from; |
7fe7fe74 | 138 | int fromlen = sizeof (from), cc; |
fdd0ed12 | 139 | |
7fe7fe74 | 140 | cc = recvfrom(fd, packet, sizeof (packet), 0, &from, &fromlen); |
fdd0ed12 SL |
141 | if (cc <= 0) { |
142 | if (cc < 0 && errno != EINTR) | |
7fe7fe74 | 143 | perror("recvfrom"); |
fdd0ed12 SL |
144 | return; |
145 | } | |
7fe7fe74 SL |
146 | if (fromlen != sizeof (struct sockaddr_in)) |
147 | return; | |
fdd0ed12 SL |
148 | sighold(SIGALRM); |
149 | rip_input(&from, cc); | |
150 | sigrelse(SIGALRM); | |
151 | } | |
7fe7fe74 SL |
152 | |
153 | getsocket(domain, type, sin) | |
154 | int domain, type; | |
155 | struct sockaddr_in *sin; | |
156 | { | |
157 | int retry, s; | |
158 | ||
159 | retry = 1; | |
160 | while ((s = socket(domain, type, 0, 0)) < 0 && retry) { | |
161 | perror("socket"); | |
162 | sleep(5 * retry); | |
163 | retry <<= 1; | |
164 | } | |
165 | if (retry == 0) | |
166 | return (-1); | |
167 | while (bind(s, sin, sizeof (*sin), 0) < 0 && retry) { | |
168 | perror("bind"); | |
169 | sleep(5 * retry); | |
170 | retry <<= 1; | |
171 | } | |
172 | if (retry == 0) | |
173 | return (-1); | |
174 | return (s); | |
175 | } |