Annotation of src/usr.bin/talk/get_names.c, Revision 1.8
1.8 ! deraadt 1: /* $OpenBSD: get_names.c,v 1.7 2000/12/31 00:24:51 hugh 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.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: */
36:
37: #ifndef lint
38: #if 0
39: static char sccsid[] = "@(#)get_names.c 8.1 (Berkeley) 6/6/93";
40: #endif
1.8 ! deraadt 41: static char rcsid[] = "$OpenBSD: get_names.c,v 1.7 2000/12/31 00:24:51 hugh Exp $";
1.1 deraadt 42: #endif /* not lint */
43:
1.5 pjanzen 44: #include "talk.h"
1.1 deraadt 45: #include <sys/param.h>
46: #include <pwd.h>
1.5 pjanzen 47: #include <unistd.h>
1.1 deraadt 48:
49: extern CTL_MSG msg;
50:
51: /*
52: * Determine the local and remote user, tty, and machines
53: */
1.5 pjanzen 54: void
1.1 deraadt 55: get_names(argc, argv)
56: int argc;
57: char *argv[];
58: {
59: char hostname[MAXHOSTNAMELEN];
60: char *his_name, *my_name;
61: char *my_machine_name, *his_machine_name;
1.5 pjanzen 62: char *his_tty;
1.1 deraadt 63: register char *cp;
64: char *names;
1.7 hugh 65:
66: if (argc > 1 && !strcmp(argv[1], "-H")) {
67: argv[1] = argv[0];
68: ++argv;
69: --argc;
70: high_print = 1;
71: }
1.1 deraadt 72:
1.5 pjanzen 73: if ((argc < 2 ) || ('@' == argv[1][0])) {
1.6 millert 74: fprintf(stderr, "usage: talk user [ttyname]\n"
75: " talk user@hostname [ttyname]\n");
1.8 ! deraadt 76: exit(1);
1.4 jkatz 77: }
1.6 millert 78: if (!isatty(0))
79: errx(1, "standard input must be a tty, not a pipe or a file");
1.4 jkatz 80:
1.1 deraadt 81: if ((my_name = getlogin()) == NULL) {
82: struct passwd *pw;
83:
1.6 millert 84: if ((pw = getpwuid(getuid())) == NULL)
85: errx(1, "you don't exist in the passwd file.");
1.1 deraadt 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]);
1.3 millert 92: for (cp = names; *cp && !strchr("@:!.", *cp); cp++)
1.1 deraadt 93: ;
94: if (*cp == '\0') {
95: /* this is a local to local talk */
96: his_name = names;
97: his_machine_name = my_machine_name;
98: } else {
99: if (*cp++ == '@') {
100: /* user@host */
101: his_name = names;
102: his_machine_name = cp;
103: } else {
104: /* host.user or host!user or host:user */
105: his_name = cp;
106: his_machine_name = names;
107: }
108: *--cp = '\0';
109: }
110: if (argc > 2)
111: his_tty = argv[2]; /* tty name is arg 2 */
112: else
113: his_tty = "";
114: get_addrs(my_machine_name, his_machine_name);
115: /*
116: * Initialize the message template.
117: */
118: msg.vers = TALK_VERSION;
119: msg.addr.sa_family = htons(AF_INET);
120: msg.ctl_addr.sa_family = htons(AF_INET);
121: msg.id_num = htonl(0);
122: strncpy(msg.l_name, my_name, NAME_SIZE);
123: msg.l_name[NAME_SIZE - 1] = '\0';
124: strncpy(msg.r_name, his_name, NAME_SIZE);
125: msg.r_name[NAME_SIZE - 1] = '\0';
126: strncpy(msg.r_tty, his_tty, TTY_SIZE);
127: msg.r_tty[TTY_SIZE - 1] = '\0';
128: }
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