Commit | Line | Data |
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fdd0ed12 | 1 | #ifndef lint |
d002aa8c | 2 | static char sccsid[] = "@(#)main.c 4.13 (Berkeley) %G%"; |
fdd0ed12 SL |
3 | #endif |
4 | ||
5 | /* | |
6 | * Routing Table Management Daemon | |
7 | */ | |
7fe7fe74 | 8 | #include "defs.h" |
fdd0ed12 | 9 | #include <sys/ioctl.h> |
e2feeea9 SL |
10 | #include <sys/time.h> |
11 | ||
fdd0ed12 | 12 | #include <net/if.h> |
e2feeea9 | 13 | |
fdd0ed12 SL |
14 | #include <errno.h> |
15 | #include <nlist.h> | |
16 | #include <signal.h> | |
69b7ef61 | 17 | #include <syslog.h> |
fdd0ed12 SL |
18 | |
19 | int supplier = -1; /* process should supply updates */ | |
d002aa8c | 20 | int gateway = 0; /* 1 if we are a gateway to parts beyond */ |
fdd0ed12 SL |
21 | |
22 | struct rip *msg = (struct rip *)packet; | |
b7e4f8be | 23 | int hup(); |
fdd0ed12 SL |
24 | |
25 | main(argc, argv) | |
26 | int argc; | |
27 | char *argv[]; | |
28 | { | |
29 | int cc; | |
30 | struct sockaddr from; | |
7fe7fe74 | 31 | u_char retry; |
fdd0ed12 SL |
32 | |
33 | argv0 = argv; | |
69b7ef61 | 34 | openlog("routed", LOG_PID, 0); |
fdd0ed12 | 35 | sp = getservbyname("router", "udp"); |
7fe7fe74 SL |
36 | if (sp == NULL) { |
37 | fprintf(stderr, "routed: router/udp: unknown service\n"); | |
fdd0ed12 SL |
38 | exit(1); |
39 | } | |
7fe7fe74 SL |
40 | addr.sin_family = AF_INET; |
41 | addr.sin_port = sp->s_port; | |
42 | s = getsocket(AF_INET, SOCK_DGRAM, &addr); | |
43 | if (s < 0) | |
44 | exit(1); | |
fdd0ed12 SL |
45 | argv++, argc--; |
46 | while (argc > 0 && **argv == '-') { | |
d4b6a849 | 47 | if (strcmp(*argv, "-s") == 0) { |
fdd0ed12 SL |
48 | supplier = 1; |
49 | argv++, argc--; | |
50 | continue; | |
51 | } | |
d4b6a849 | 52 | if (strcmp(*argv, "-q") == 0) { |
fdd0ed12 SL |
53 | supplier = 0; |
54 | argv++, argc--; | |
55 | continue; | |
56 | } | |
d4b6a849 SL |
57 | if (strcmp(*argv, "-t") == 0) { |
58 | tracepackets++; | |
59 | argv++, argc--; | |
60 | continue; | |
61 | } | |
5562f0a3 MK |
62 | if (strcmp(*argv, "-g") == 0) { |
63 | gateway = 1; | |
64 | argv++, argc--; | |
65 | continue; | |
66 | } | |
5562f0a3 | 67 | fprintf(stderr, |
d002aa8c | 68 | "usage: routed [ -s ] [ -q ] [ -t ] [ -g ]\n"); |
fdd0ed12 SL |
69 | exit(1); |
70 | } | |
d4b6a849 SL |
71 | #ifndef DEBUG |
72 | if (!tracepackets) { | |
73 | int t; | |
74 | ||
75 | if (fork()) | |
76 | exit(0); | |
7620381d SL |
77 | for (t = 0; t < 20; t++) |
78 | if (t != s) | |
7620381d | 79 | (void) close(cc); |
d4b6a849 SL |
80 | (void) open("/", 0); |
81 | (void) dup2(0, 1); | |
82 | (void) dup2(0, 2); | |
83 | t = open("/dev/tty", 2); | |
84 | if (t >= 0) { | |
85 | ioctl(t, TIOCNOTTY, (char *)0); | |
86 | (void) close(t); | |
87 | } | |
88 | } | |
89 | #endif | |
7fe7fe74 SL |
90 | /* |
91 | * Any extra argument is considered | |
92 | * a tracing log file. | |
93 | */ | |
94 | if (argc > 0) | |
95 | traceon(*argv); | |
fdd0ed12 SL |
96 | /* |
97 | * Collect an initial view of the world by | |
d002aa8c | 98 | * checking the interface configuration and the gateway kludge |
fdd0ed12 SL |
99 | * file. Then, send a request packet on all |
100 | * directly connected networks to find out what | |
101 | * everyone else thinks. | |
102 | */ | |
103 | rtinit(); | |
104 | gwkludge(); | |
105 | ifinit(); | |
d002aa8c MK |
106 | if (gateway > 0) |
107 | rtdefault(); | |
fdd0ed12 SL |
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 | 116 | toall(sendmsg); |
ce5e9df4 | 117 | signal(SIGALRM, timer); |
b7e4f8be | 118 | signal(SIGHUP, hup); |
69b7ef61 | 119 | signal(SIGTERM, hup); |
fdd0ed12 SL |
120 | timer(); |
121 | ||
fdd0ed12 SL |
122 | for (;;) { |
123 | int ibits; | |
124 | register int n; | |
125 | ||
7fe7fe74 | 126 | ibits = 1 << s; |
7fe7fe74 | 127 | n = select(20, &ibits, 0, 0, 0); |
fdd0ed12 SL |
128 | if (n < 0) |
129 | continue; | |
130 | if (ibits & (1 << s)) | |
131 | process(s); | |
7fe7fe74 | 132 | /* handle ICMP redirects */ |
fdd0ed12 SL |
133 | } |
134 | } | |
135 | ||
136 | process(fd) | |
137 | int fd; | |
138 | { | |
fdd0ed12 | 139 | struct sockaddr from; |
ce5e9df4 | 140 | int fromlen = sizeof (from), cc, omask; |
fdd0ed12 | 141 | |
7fe7fe74 | 142 | cc = recvfrom(fd, packet, sizeof (packet), 0, &from, &fromlen); |
fdd0ed12 SL |
143 | if (cc <= 0) { |
144 | if (cc < 0 && errno != EINTR) | |
7fe7fe74 | 145 | perror("recvfrom"); |
fdd0ed12 SL |
146 | return; |
147 | } | |
7fe7fe74 SL |
148 | if (fromlen != sizeof (struct sockaddr_in)) |
149 | return; | |
ce5e9df4 SL |
150 | #define mask(s) (1<<((s)-1)) |
151 | omask = sigblock(mask(SIGALRM)); | |
fdd0ed12 | 152 | rip_input(&from, cc); |
ce5e9df4 | 153 | sigsetmask(omask); |
fdd0ed12 | 154 | } |
7fe7fe74 SL |
155 | |
156 | getsocket(domain, type, sin) | |
157 | int domain, type; | |
158 | struct sockaddr_in *sin; | |
159 | { | |
69b7ef61 | 160 | int retry, s, on = 1; |
7fe7fe74 SL |
161 | |
162 | retry = 1; | |
163 | while ((s = socket(domain, type, 0, 0)) < 0 && retry) { | |
164 | perror("socket"); | |
165 | sleep(5 * retry); | |
166 | retry <<= 1; | |
167 | } | |
69b7ef61 MK |
168 | if (retry == 0) { |
169 | syslog(LOG_ERR, "socket: %m"); | |
7fe7fe74 | 170 | return (-1); |
69b7ef61 MK |
171 | } |
172 | if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) { | |
173 | syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m"); | |
174 | exit(1); | |
175 | } | |
7fe7fe74 SL |
176 | while (bind(s, sin, sizeof (*sin), 0) < 0 && retry) { |
177 | perror("bind"); | |
178 | sleep(5 * retry); | |
179 | retry <<= 1; | |
180 | } | |
69b7ef61 MK |
181 | if (retry == 0) { |
182 | syslog(LOG_ERR, "bind: %m"); | |
7fe7fe74 | 183 | return (-1); |
69b7ef61 | 184 | } |
7fe7fe74 SL |
185 | return (s); |
186 | } |