Commit | Line | Data |
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fdd0ed12 | 1 | #ifndef lint |
ab722498 | 2 | static char sccsid[] = "@(#)main.c 4.12 (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 */ | |
5562f0a3 | 20 | extern int gateway; |
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 | } | |
67 | if (strcmp(*argv, "-l") == 0) { | |
68 | gateway = -1; | |
69 | argv++, argc--; | |
70 | continue; | |
71 | } | |
72 | fprintf(stderr, | |
73 | "usage: routed [ -s ] [ -q ] [ -t ] [ -g ] [ -l ]\n"); | |
fdd0ed12 SL |
74 | exit(1); |
75 | } | |
d4b6a849 SL |
76 | #ifndef DEBUG |
77 | if (!tracepackets) { | |
78 | int t; | |
79 | ||
80 | if (fork()) | |
81 | exit(0); | |
7620381d SL |
82 | for (t = 0; t < 20; t++) |
83 | if (t != s) | |
7620381d | 84 | (void) close(cc); |
d4b6a849 SL |
85 | (void) open("/", 0); |
86 | (void) dup2(0, 1); | |
87 | (void) dup2(0, 2); | |
88 | t = open("/dev/tty", 2); | |
89 | if (t >= 0) { | |
90 | ioctl(t, TIOCNOTTY, (char *)0); | |
91 | (void) close(t); | |
92 | } | |
93 | } | |
94 | #endif | |
7fe7fe74 SL |
95 | /* |
96 | * Any extra argument is considered | |
97 | * a tracing log file. | |
98 | */ | |
99 | if (argc > 0) | |
100 | traceon(*argv); | |
fdd0ed12 SL |
101 | /* |
102 | * Collect an initial view of the world by | |
103 | * snooping in the kernel and the gateway kludge | |
104 | * file. Then, send a request packet on all | |
105 | * directly connected networks to find out what | |
106 | * everyone else thinks. | |
107 | */ | |
108 | rtinit(); | |
109 | gwkludge(); | |
110 | ifinit(); | |
111 | if (supplier < 0) | |
112 | supplier = 0; | |
113 | msg->rip_cmd = RIPCMD_REQUEST; | |
55d340a4 | 114 | msg->rip_vers = RIPVERSION; |
fdd0ed12 SL |
115 | msg->rip_nets[0].rip_dst.sa_family = AF_UNSPEC; |
116 | msg->rip_nets[0].rip_metric = HOPCNT_INFINITY; | |
55d340a4 SL |
117 | msg->rip_nets[0].rip_dst.sa_family = htons(AF_UNSPEC); |
118 | msg->rip_nets[0].rip_metric = htonl(HOPCNT_INFINITY); | |
fdd0ed12 | 119 | toall(sendmsg); |
ce5e9df4 | 120 | signal(SIGALRM, timer); |
b7e4f8be | 121 | signal(SIGHUP, hup); |
69b7ef61 | 122 | signal(SIGTERM, hup); |
fdd0ed12 SL |
123 | timer(); |
124 | ||
fdd0ed12 SL |
125 | for (;;) { |
126 | int ibits; | |
127 | register int n; | |
128 | ||
7fe7fe74 | 129 | ibits = 1 << s; |
7fe7fe74 | 130 | n = select(20, &ibits, 0, 0, 0); |
fdd0ed12 SL |
131 | if (n < 0) |
132 | continue; | |
133 | if (ibits & (1 << s)) | |
134 | process(s); | |
7fe7fe74 | 135 | /* handle ICMP redirects */ |
fdd0ed12 SL |
136 | } |
137 | } | |
138 | ||
139 | process(fd) | |
140 | int fd; | |
141 | { | |
fdd0ed12 | 142 | struct sockaddr from; |
ce5e9df4 | 143 | int fromlen = sizeof (from), cc, omask; |
fdd0ed12 | 144 | |
7fe7fe74 | 145 | cc = recvfrom(fd, packet, sizeof (packet), 0, &from, &fromlen); |
fdd0ed12 SL |
146 | if (cc <= 0) { |
147 | if (cc < 0 && errno != EINTR) | |
7fe7fe74 | 148 | perror("recvfrom"); |
fdd0ed12 SL |
149 | return; |
150 | } | |
7fe7fe74 SL |
151 | if (fromlen != sizeof (struct sockaddr_in)) |
152 | return; | |
ce5e9df4 SL |
153 | #define mask(s) (1<<((s)-1)) |
154 | omask = sigblock(mask(SIGALRM)); | |
fdd0ed12 | 155 | rip_input(&from, cc); |
ce5e9df4 | 156 | sigsetmask(omask); |
fdd0ed12 | 157 | } |
7fe7fe74 SL |
158 | |
159 | getsocket(domain, type, sin) | |
160 | int domain, type; | |
161 | struct sockaddr_in *sin; | |
162 | { | |
69b7ef61 | 163 | int retry, s, on = 1; |
7fe7fe74 SL |
164 | |
165 | retry = 1; | |
166 | while ((s = socket(domain, type, 0, 0)) < 0 && retry) { | |
167 | perror("socket"); | |
168 | sleep(5 * retry); | |
169 | retry <<= 1; | |
170 | } | |
69b7ef61 MK |
171 | if (retry == 0) { |
172 | syslog(LOG_ERR, "socket: %m"); | |
7fe7fe74 | 173 | return (-1); |
69b7ef61 MK |
174 | } |
175 | if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) { | |
176 | syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m"); | |
177 | exit(1); | |
178 | } | |
7fe7fe74 SL |
179 | while (bind(s, sin, sizeof (*sin), 0) < 0 && retry) { |
180 | perror("bind"); | |
181 | sleep(5 * retry); | |
182 | retry <<= 1; | |
183 | } | |
69b7ef61 MK |
184 | if (retry == 0) { |
185 | syslog(LOG_ERR, "bind: %m"); | |
7fe7fe74 | 186 | return (-1); |
69b7ef61 | 187 | } |
7fe7fe74 SL |
188 | return (s); |
189 | } |