Annotation of src/usr.bin/talk/get_names.c, Revision 1.5
1.5 ! pjanzen 1: /* $OpenBSD: get_names.c,v 1.4 1997/02/01 19:38:26 jkatz 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
1.5 ! pjanzen 41: static char rcsid[] = "$OpenBSD: get_names.c,v 1.4 1997/02/01 19:38:26 jkatz 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;
65:
1.5 ! pjanzen 66: if ((argc < 2 ) || ('@' == argv[1][0])) {
1.1 deraadt 67: printf("Usage: talk user [ttyname]\n");
1.4 jkatz 68: printf(" talk user@hostname [ttyname]\n");
1.1 deraadt 69: exit(-1);
70: }
71: if (!isatty(0)) {
72: printf("Standard input must be a tty, not a pipe or a file\n");
1.4 jkatz 73: exit(-1);
74: }
75:
1.1 deraadt 76: if ((my_name = getlogin()) == NULL) {
77: struct passwd *pw;
78:
79: if ((pw = getpwuid(getuid())) == NULL) {
80: printf("You don't exist. Go away.\n");
81: exit(-1);
82: }
83: my_name = pw->pw_name;
84: }
85: gethostname(hostname, sizeof (hostname));
86: my_machine_name = hostname;
87: /* check for, and strip out, the machine name of the target */
88: names = strdup(argv[1]);
1.3 millert 89: for (cp = names; *cp && !strchr("@:!.", *cp); cp++)
1.1 deraadt 90: ;
91: if (*cp == '\0') {
92: /* this is a local to local talk */
93: his_name = names;
94: his_machine_name = my_machine_name;
95: } else {
96: if (*cp++ == '@') {
97: /* user@host */
98: his_name = names;
99: his_machine_name = cp;
100: } else {
101: /* host.user or host!user or host:user */
102: his_name = cp;
103: his_machine_name = names;
104: }
105: *--cp = '\0';
106: }
107: if (argc > 2)
108: his_tty = argv[2]; /* tty name is arg 2 */
109: else
110: his_tty = "";
111: get_addrs(my_machine_name, his_machine_name);
112: /*
113: * Initialize the message template.
114: */
115: msg.vers = TALK_VERSION;
116: msg.addr.sa_family = htons(AF_INET);
117: msg.ctl_addr.sa_family = htons(AF_INET);
118: msg.id_num = htonl(0);
119: strncpy(msg.l_name, my_name, NAME_SIZE);
120: msg.l_name[NAME_SIZE - 1] = '\0';
121: strncpy(msg.r_name, his_name, NAME_SIZE);
122: msg.r_name[NAME_SIZE - 1] = '\0';
123: strncpy(msg.r_tty, his_tty, TTY_SIZE);
124: msg.r_tty[TTY_SIZE - 1] = '\0';
125: }