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1 | /* |
2 | * Copyright (c) 1983 Regents of the University of California. | |
3 | * All rights reserved. The Berkeley software License Agreement | |
4 | * specifies the terms and conditions for redistribution. | |
5 | */ | |
6 | ||
7 | #ifndef lint | |
8 | char copyright[] = | |
9 | "@(#) Copyright (c) 1983 Regents of the University of California.\n\ | |
10 | All rights reserved.\n"; | |
11 | #endif not lint | |
12 | ||
13 | #ifndef lint | |
14 | static char sccsid[] = "@(#)talkd.c 5.1 (Berkeley) 6/6/85"; | |
15 | #endif not lint | |
16 | ||
17 | /* | |
18 | * The top level of the daemon, the format is heavily borrowed | |
19 | * from rwhod.c. Basically: find out who and where you are; | |
20 | * disconnect all descriptors and ttys, and then endless | |
21 | * loop on waiting for and processing requests | |
22 | */ | |
23 | #include <stdio.h> | |
24 | #include <errno.h> | |
25 | #include <signal.h> | |
26 | ||
27 | #include "ctl.h" | |
28 | ||
29 | struct sockaddr_in sin = { AF_INET }; | |
30 | ||
31 | CTL_MSG request; | |
32 | CTL_RESPONSE response; | |
33 | ||
34 | int sockt; | |
35 | int debug = 0; | |
36 | FILE *debugout; | |
37 | int timeout(); | |
38 | long lastmsgtime; | |
39 | ||
40 | char hostname[32]; | |
41 | ||
42 | #define TIMEOUT 30 | |
43 | #define MAXIDLE 120 | |
44 | ||
45 | main(argc, argv) | |
46 | int argc; | |
47 | char *argv[]; | |
48 | { | |
49 | struct sockaddr_in from; | |
50 | int fromlen, cc; | |
51 | ||
52 | if (debug) | |
53 | debugout = (FILE *)fopen ("/usr/tmp/talkd.msgs", "w"); | |
54 | ||
55 | if (getuid()) { | |
56 | fprintf(stderr, "Talkd : not super user\n"); | |
57 | exit(1); | |
58 | } | |
59 | gethostname(hostname, sizeof (hostname)); | |
60 | (void) chdir("/dev"); | |
61 | signal(SIGALRM, timeout); | |
62 | alarm(TIMEOUT); | |
63 | for (;;) { | |
64 | extern int errno; | |
65 | ||
66 | fromlen = sizeof(from); | |
67 | cc = recvfrom(0, (char *)&request, sizeof (request), 0, | |
68 | &from, &fromlen); | |
69 | if (cc != sizeof(request)) { | |
70 | if (cc < 0 && errno != EINTR) | |
71 | perror("recvfrom"); | |
72 | continue; | |
73 | } | |
74 | lastmsgtime = time(0); | |
75 | swapmsg(&request); | |
76 | if (debug) print_request(&request); | |
77 | process_request(&request, &response); | |
78 | /* can block here, is this what I want? */ | |
79 | cc = sendto(sockt, (char *) &response, | |
80 | sizeof (response), 0, &request.ctl_addr, | |
81 | sizeof (request.ctl_addr)); | |
82 | if (cc != sizeof(response)) | |
83 | perror("sendto"); | |
84 | } | |
85 | } | |
86 | ||
87 | timeout() | |
88 | { | |
89 | ||
90 | if (time(0) - lastmsgtime >= MAXIDLE) | |
91 | exit(0); | |
92 | alarm(TIMEOUT); | |
93 | } | |
94 | ||
95 | /* | |
96 | * heuristic to detect if need to swap bytes | |
97 | */ | |
98 | ||
99 | swapmsg(req) | |
100 | CTL_MSG *req; | |
101 | { | |
102 | if (req->ctl_addr.sin_family == ntohs(AF_INET)) { | |
103 | req->id_num = ntohl(req->id_num); | |
104 | req->pid = ntohl(req->pid); | |
105 | req->addr.sin_family = ntohs(req->addr.sin_family); | |
106 | req->ctl_addr.sin_family = | |
107 | ntohs(req->ctl_addr.sin_family); | |
108 | } | |
109 | } |