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984263bc MD |
1 | /* |
2 | * Copyright (c) 1983, 1993 | |
3 | * The Regents of the University of California. 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. | |
1de703da MD |
32 | * |
33 | * @(#)get_names.c 8.1 (Berkeley) 6/6/93 | |
34 | * $FreeBSD: src/usr.bin/talk/get_names.c,v 1.6.2.1 2001/07/30 10:31:29 dd Exp $ | |
984263bc MD |
35 | */ |
36 | ||
984263bc MD |
37 | #include <err.h> |
38 | #include <pwd.h> | |
39 | #include <stdlib.h> | |
40 | #include <string.h> | |
41 | #include <sys/param.h> | |
42 | #include "talk.h" | |
43 | ||
44 | extern CTL_MSG msg; | |
45 | ||
46 | static void | |
47 | usage(void) | |
48 | { | |
49 | fprintf(stderr, "usage: talk person [ttyname]\n"); | |
50 | exit(1); | |
51 | } | |
52 | ||
53 | /* | |
54 | * Determine the local and remote user, tty, and machines | |
55 | */ | |
56 | void | |
1d1731fa | 57 | get_names(int argc, char **argv) |
984263bc MD |
58 | { |
59 | char hostname[MAXHOSTNAMELEN]; | |
60 | char *his_name, *my_name; | |
61 | char *my_machine_name, *his_machine_name; | |
e2daa382 | 62 | const char *his_tty; |
815943a9 | 63 | char *cp; |
984263bc MD |
64 | |
65 | if (argc < 2 ) | |
66 | usage(); | |
67 | if (!isatty(0)) | |
68 | errx(1, "standard input must be a tty, not a pipe or a file"); | |
69 | if ((my_name = getlogin()) == NULL) { | |
70 | struct passwd *pw; | |
71 | ||
72 | if ((pw = getpwuid(getuid())) == NULL) | |
73 | errx(1, "you don't exist. Go away"); | |
74 | my_name = pw->pw_name; | |
75 | } | |
76 | gethostname(hostname, sizeof (hostname)); | |
77 | my_machine_name = hostname; | |
78 | /* check for, and strip out, the machine name of the target */ | |
43b4d1bd | 79 | for (cp = argv[1]; *cp && !strchr("@:!", *cp); cp++) |
984263bc MD |
80 | ; |
81 | if (*cp == '\0') { | |
82 | /* this is a local to local talk */ | |
83 | his_name = argv[1]; | |
84 | his_machine_name = my_machine_name; | |
85 | } else { | |
86 | if (*cp++ == '@') { | |
87 | /* user@host */ | |
88 | his_name = argv[1]; | |
89 | his_machine_name = cp; | |
90 | } else { | |
91 | /* host!user or host:user */ | |
92 | his_name = cp; | |
93 | his_machine_name = argv[1]; | |
94 | } | |
95 | *--cp = '\0'; | |
96 | } | |
97 | if (argc > 2) | |
98 | his_tty = argv[2]; /* tty name is arg 2 */ | |
99 | else | |
100 | his_tty = ""; | |
101 | get_addrs(my_machine_name, his_machine_name); | |
102 | /* | |
103 | * Initialize the message template. | |
104 | */ | |
105 | msg.vers = TALK_VERSION; | |
106 | msg.addr.sa_family = htons(AF_INET); | |
107 | msg.ctl_addr.sa_family = htons(AF_INET); | |
108 | msg.id_num = htonl(0); | |
109 | strncpy(msg.l_name, my_name, NAME_SIZE); | |
110 | msg.l_name[NAME_SIZE - 1] = '\0'; | |
111 | strncpy(msg.r_name, his_name, NAME_SIZE); | |
112 | msg.r_name[NAME_SIZE - 1] = '\0'; | |
113 | strncpy(msg.r_tty, his_tty, TTY_SIZE); | |
114 | msg.r_tty[TTY_SIZE - 1] = '\0'; | |
115 | } |