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fe21a3f7 WJ |
1 | /* |
2 | * Copyright (c) 1983 Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | */ | |
33 | ||
34 | #ifndef lint | |
35 | static char sccsid[] = "@(#)get_names.c 5.9 (Berkeley) 3/1/91"; | |
36 | #endif /* not lint */ | |
37 | ||
38 | #include <sys/param.h> | |
39 | #include <sys/socket.h> | |
40 | #include <protocols/talkd.h> | |
41 | #include <pwd.h> | |
42 | #include "talk.h" | |
43 | ||
44 | char *getlogin(); | |
45 | char *ttyname(); | |
46 | char *rindex(); | |
47 | extern CTL_MSG msg; | |
48 | ||
49 | /* | |
50 | * Determine the local and remote user, tty, and machines | |
51 | */ | |
52 | get_names(argc, argv) | |
53 | int argc; | |
54 | char *argv[]; | |
55 | { | |
56 | char hostname[MAXHOSTNAMELEN]; | |
57 | char *his_name, *my_name; | |
58 | char *my_machine_name, *his_machine_name; | |
59 | char *my_tty, *his_tty; | |
60 | register char *cp; | |
61 | ||
62 | if (argc < 2 ) { | |
63 | printf("Usage: talk user [ttyname]\n"); | |
64 | exit(-1); | |
65 | } | |
66 | if (!isatty(0)) { | |
67 | printf("Standard input must be a tty, not a pipe or a file\n"); | |
68 | exit(-1); | |
69 | } | |
70 | if ((my_name = getlogin()) == NULL) { | |
71 | struct passwd *pw; | |
72 | ||
73 | if ((pw = getpwuid(getuid())) == NULL) { | |
74 | printf("You don't exist. Go away.\n"); | |
75 | exit(-1); | |
76 | } | |
77 | my_name = pw->pw_name; | |
78 | } | |
79 | gethostname(hostname, sizeof (hostname)); | |
80 | my_machine_name = hostname; | |
81 | /* check for, and strip out, the machine name of the target */ | |
82 | for (cp = argv[1]; *cp && !index("@:!.", *cp); cp++) | |
83 | ; | |
84 | if (*cp == '\0') { | |
85 | /* this is a local to local talk */ | |
86 | his_name = argv[1]; | |
87 | his_machine_name = my_machine_name; | |
88 | } else { | |
89 | if (*cp++ == '@') { | |
90 | /* user@host */ | |
91 | his_name = argv[1]; | |
92 | his_machine_name = cp; | |
93 | } else { | |
94 | /* host.user or host!user or host:user */ | |
95 | his_name = cp; | |
96 | his_machine_name = argv[1]; | |
97 | } | |
98 | *--cp = '\0'; | |
99 | } | |
100 | if (argc > 2) | |
101 | his_tty = argv[2]; /* tty name is arg 2 */ | |
102 | else | |
103 | his_tty = ""; | |
104 | get_addrs(my_machine_name, his_machine_name); | |
105 | /* | |
106 | * Initialize the message template. | |
107 | */ | |
108 | msg.vers = TALK_VERSION; | |
109 | msg.addr.sa_family = htons(AF_INET); | |
110 | msg.ctl_addr.sa_family = htons(AF_INET); | |
111 | msg.id_num = htonl(0); | |
112 | strncpy(msg.l_name, my_name, NAME_SIZE); | |
113 | msg.l_name[NAME_SIZE - 1] = '\0'; | |
114 | strncpy(msg.r_name, his_name, NAME_SIZE); | |
115 | msg.r_name[NAME_SIZE - 1] = '\0'; | |
116 | strncpy(msg.r_tty, his_tty, TTY_SIZE); | |
117 | msg.r_tty[TTY_SIZE - 1] = '\0'; | |
118 | } |