Commit | Line | Data |
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d0aeaf5a DF |
1 | /* |
2 | * Copyright (c) 1983 Regents of the University of California. | |
f9ac90b4 KB |
3 | * All rights reserved. |
4 | * | |
cb956e54 | 5 | * %sccs.include.redist.c% |
d0aeaf5a DF |
6 | */ |
7 | ||
963ce42e | 8 | #ifndef lint |
cb956e54 | 9 | static char sccsid[] = "@(#)get_names.c 5.8 (Berkeley) %G%"; |
f9ac90b4 | 10 | #endif /* not lint */ |
3e758ab9 MK |
11 | |
12 | #include "talk.h" | |
4fa2ac2d KM |
13 | #include <sys/param.h> |
14 | #include <protocols/talkd.h> | |
82439d4b | 15 | #include <pwd.h> |
3e758ab9 | 16 | |
4fa2ac2d KM |
17 | char *getlogin(); |
18 | char *ttyname(); | |
19 | char *rindex(); | |
4fa2ac2d | 20 | extern CTL_MSG msg; |
963ce42e | 21 | |
3e758ab9 MK |
22 | /* |
23 | * Determine the local and remote user, tty, and machines | |
24 | */ | |
3e758ab9 | 25 | get_names(argc, argv) |
963ce42e MK |
26 | int argc; |
27 | char *argv[]; | |
3e758ab9 | 28 | { |
4fa2ac2d KM |
29 | char hostname[MAXHOSTNAMELEN]; |
30 | char *his_name, *my_name; | |
31 | char *my_machine_name, *his_machine_name; | |
32 | char *my_tty, *his_tty; | |
33 | register char *cp; | |
963ce42e MK |
34 | |
35 | if (argc < 2 ) { | |
4fa2ac2d | 36 | printf("Usage: talk user [ttyname]\n"); |
963ce42e MK |
37 | exit(-1); |
38 | } | |
39 | if (!isatty(0)) { | |
40 | printf("Standard input must be a tty, not a pipe or a file\n"); | |
41 | exit(-1); | |
42 | } | |
82439d4b EW |
43 | if ((my_name = getlogin()) == NULL) { |
44 | struct passwd *pw; | |
45 | ||
46 | if ((pw = getpwuid(getuid())) == NULL) { | |
47 | printf("You don't exist. Go away.\n"); | |
48 | exit(-1); | |
49 | } | |
50 | my_name = pw->pw_name; | |
963ce42e MK |
51 | } |
52 | gethostname(hostname, sizeof (hostname)); | |
53 | my_machine_name = hostname; | |
963ce42e | 54 | /* check for, and strip out, the machine name of the target */ |
4fa2ac2d | 55 | for (cp = argv[1]; *cp && !any(*cp, "@:!."); cp++) |
963ce42e | 56 | ; |
4fa2ac2d | 57 | if (*cp == '\0') { |
963ce42e MK |
58 | /* this is a local to local talk */ |
59 | his_name = argv[1]; | |
60 | his_machine_name = my_machine_name; | |
3e758ab9 | 61 | } else { |
4fa2ac2d | 62 | if (*cp++ == '@') { |
963ce42e MK |
63 | /* user@host */ |
64 | his_name = argv[1]; | |
4fa2ac2d | 65 | his_machine_name = cp; |
963ce42e MK |
66 | } else { |
67 | /* host.user or host!user or host:user */ | |
4fa2ac2d | 68 | his_name = cp; |
963ce42e MK |
69 | his_machine_name = argv[1]; |
70 | } | |
4fa2ac2d | 71 | *--cp = '\0'; |
3e758ab9 | 72 | } |
963ce42e MK |
73 | if (argc > 2) |
74 | his_tty = argv[2]; /* tty name is arg 2 */ | |
75 | else | |
76 | his_tty = ""; | |
77 | get_addrs(my_machine_name, his_machine_name); | |
4fa2ac2d KM |
78 | /* |
79 | * Initialize the message template. | |
80 | */ | |
81 | msg.vers = TALK_VERSION; | |
82 | msg.addr.sa_family = htons(AF_INET); | |
83 | msg.ctl_addr.sa_family = htons(AF_INET); | |
84 | msg.id_num = htonl(0); | |
963ce42e MK |
85 | strncpy(msg.l_name, my_name, NAME_SIZE); |
86 | msg.l_name[NAME_SIZE - 1] = '\0'; | |
87 | strncpy(msg.r_name, his_name, NAME_SIZE); | |
88 | msg.r_name[NAME_SIZE - 1] = '\0'; | |
89 | strncpy(msg.r_tty, his_tty, TTY_SIZE); | |
90 | msg.r_tty[TTY_SIZE - 1] = '\0'; | |
3e758ab9 | 91 | } |
4fa2ac2d KM |
92 | |
93 | static | |
94 | any(c, cp) | |
95 | register char c, *cp; | |
96 | { | |
97 | ||
98 | while (*cp) | |
99 | if (c == *cp++) | |
100 | return (1); | |
101 | return (0); | |
102 | } |