1 /* $OpenBSD: get_names.c,v 1.21 2016/02/01 07:29:25 mestre Exp $ */
2 /* $NetBSD: get_names.c,v 1.4 1994/12/09 02:14:16 jtc Exp $ */
3
4 /*
5 * Copyright (c) 1983, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #include <sys/socket.h>
34
35 #include <err.h>
36 #include <limits.h>
37 #include <pwd.h>
38 #include <stdlib.h>
39 #include <string.h>
40 #include <unistd.h>
41
42 #include "talk.h"
43
44 extern CTL_MSG msg;
45
46 /*
47 * Determine the local and remote user, tty, and machines
48 */
49 void
get_names(int argc,char * argv[])50 get_names(int argc, char *argv[])
51 {
52 char hostname[HOST_NAME_MAX+1];
53 char *his_name, *my_name;
54 char *my_machine_name, *his_machine_name;
55 char *his_tty;
56 char *cp;
57 char *names;
58
59 if (argc > 1 && !strcmp(argv[1], "-H")) {
60 argv[1] = argv[0];
61 ++argv;
62 --argc;
63 high_print = 1;
64 }
65
66 if (argc > 1 && !strcmp(argv[1], "-s")) {
67 argv[1] = argv[0];
68 ++argv;
69 --argc;
70 smooth_scroll = TRUE;
71 }
72
73 if ((argc < 2 ) || ('@' == argv[1][0])) {
74 extern char *__progname;
75 fprintf(stderr, "usage: %s [-Hs] person [ttyname]\n", __progname);
76 exit(1);
77 }
78 if (!isatty(STDIN_FILENO))
79 errx(1, "standard input must be a tty, not a pipe or a file");
80
81 if ((my_name = getlogin()) == NULL) {
82 struct passwd *pw;
83
84 if ((pw = getpwuid(getuid())) == NULL)
85 errx(1, "you don't exist in the passwd file.");
86 my_name = pw->pw_name;
87 }
88 gethostname(hostname, sizeof (hostname));
89 my_machine_name = hostname;
90 /* check for, and strip out, the machine name of the target */
91 names = strdup(argv[1]);
92 if (names == NULL)
93 errx(1, "out of memory");
94 for (cp = names; *cp && !strchr("@:!.", *cp); cp++)
95 ;
96 if (*cp == '\0') {
97 /* this is a local to local talk */
98 his_name = names;
99 his_machine_name = my_machine_name;
100 } else {
101 if (*cp++ == '@') {
102 /* user@host */
103 his_name = names;
104 his_machine_name = cp;
105 } else {
106 /* host.user or host!user or host:user */
107 his_name = cp;
108 his_machine_name = names;
109 }
110 *--cp = '\0';
111 }
112 if (argc > 2)
113 his_tty = argv[2]; /* tty name is arg 2 */
114 else
115 his_tty = "";
116 get_addrs(my_machine_name, his_machine_name);
117 /*
118 * Initialize the message template.
119 */
120 msg.vers = TALK_VERSION;
121 msg.addr.sa_family = htons(AF_INET);
122 msg.ctl_addr.sa_family = htons(AF_INET);
123 msg.id_num = htonl(0);
124 strncpy(msg.l_name, my_name, NAME_SIZE);
125 msg.l_name[NAME_SIZE - 1] = '\0';
126 strncpy(msg.r_name, his_name, NAME_SIZE);
127 msg.r_name[NAME_SIZE - 1] = '\0';
128 strncpy(msg.r_tty, his_tty, TTY_SIZE);
129 msg.r_tty[TTY_SIZE - 1] = '\0';
130 free(names);
131 }
132