Annotation of src/usr.bin/talk/get_names.c, Revision 1.12
1.12 ! millert 1: /* $OpenBSD: get_names.c,v 1.11 2002/06/21 06:16:44 millert Exp $ */
1.1 deraadt 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.
1.12 ! millert 16: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 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: #ifndef lint
34: #if 0
35: static char sccsid[] = "@(#)get_names.c 8.1 (Berkeley) 6/6/93";
36: #endif
1.12 ! millert 37: static char rcsid[] = "$OpenBSD: get_names.c,v 1.11 2002/06/21 06:16:44 millert Exp $";
1.1 deraadt 38: #endif /* not lint */
39:
1.5 pjanzen 40: #include "talk.h"
1.1 deraadt 41: #include <sys/param.h>
42: #include <pwd.h>
1.5 pjanzen 43: #include <unistd.h>
1.1 deraadt 44:
45: extern CTL_MSG msg;
46:
47: /*
48: * Determine the local and remote user, tty, and machines
49: */
1.5 pjanzen 50: void
1.1 deraadt 51: get_names(argc, argv)
52: int argc;
53: char *argv[];
54: {
55: char hostname[MAXHOSTNAMELEN];
56: char *his_name, *my_name;
57: char *my_machine_name, *his_machine_name;
1.5 pjanzen 58: char *his_tty;
1.9 mpech 59: char *cp;
1.1 deraadt 60: char *names;
1.7 hugh 61:
62: if (argc > 1 && !strcmp(argv[1], "-H")) {
63: argv[1] = argv[0];
64: ++argv;
65: --argc;
66: high_print = 1;
67: }
1.1 deraadt 68:
1.10 millert 69: if (argc > 1 && !strcmp(argv[1], "-s")) {
70: argv[1] = argv[0];
71: ++argv;
72: --argc;
73: smooth_scroll = TRUE;
74: }
75:
1.5 pjanzen 76: if ((argc < 2 ) || ('@' == argv[1][0])) {
1.10 millert 77: fprintf(stderr, "usage: talk [-Hs] user [ttyname]\n"
78: " talk [-Hs] user@hostname [ttyname]\n");
1.8 deraadt 79: exit(1);
1.4 jkatz 80: }
1.11 millert 81: if (!isatty(STDIN_FILENO))
1.6 millert 82: errx(1, "standard input must be a tty, not a pipe or a file");
1.4 jkatz 83:
1.1 deraadt 84: if ((my_name = getlogin()) == NULL) {
85: struct passwd *pw;
86:
1.6 millert 87: if ((pw = getpwuid(getuid())) == NULL)
88: errx(1, "you don't exist in the passwd file.");
1.1 deraadt 89: my_name = pw->pw_name;
90: }
91: gethostname(hostname, sizeof (hostname));
92: my_machine_name = hostname;
93: /* check for, and strip out, the machine name of the target */
94: names = strdup(argv[1]);
1.3 millert 95: for (cp = names; *cp && !strchr("@:!.", *cp); cp++)
1.1 deraadt 96: ;
97: if (*cp == '\0') {
98: /* this is a local to local talk */
99: his_name = names;
100: his_machine_name = my_machine_name;
101: } else {
102: if (*cp++ == '@') {
103: /* user@host */
104: his_name = names;
105: his_machine_name = cp;
106: } else {
107: /* host.user or host!user or host:user */
108: his_name = cp;
109: his_machine_name = names;
110: }
111: *--cp = '\0';
112: }
113: if (argc > 2)
114: his_tty = argv[2]; /* tty name is arg 2 */
115: else
116: his_tty = "";
117: get_addrs(my_machine_name, his_machine_name);
118: /*
119: * Initialize the message template.
120: */
121: msg.vers = TALK_VERSION;
122: msg.addr.sa_family = htons(AF_INET);
123: msg.ctl_addr.sa_family = htons(AF_INET);
124: msg.id_num = htonl(0);
125: strncpy(msg.l_name, my_name, NAME_SIZE);
126: msg.l_name[NAME_SIZE - 1] = '\0';
127: strncpy(msg.r_name, his_name, NAME_SIZE);
128: msg.r_name[NAME_SIZE - 1] = '\0';
129: strncpy(msg.r_tty, his_tty, TTY_SIZE);
130: msg.r_tty[TTY_SIZE - 1] = '\0';
131: }
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