Annotation of src/usr.bin/talk/get_names.c, Revision 1.20
1.20 ! deraadt 1: /* $OpenBSD: get_names.c,v 1.19 2010/08/12 23:31:29 tedu 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:
1.5 pjanzen 33: #include "talk.h"
1.1 deraadt 34: #include <pwd.h>
1.13 david 35: #include <stdlib.h>
1.5 pjanzen 36: #include <unistd.h>
1.20 ! deraadt 37: #include <limits.h>
1.1 deraadt 38:
39: extern CTL_MSG msg;
40:
41: /*
42: * Determine the local and remote user, tty, and machines
43: */
1.5 pjanzen 44: void
1.19 tedu 45: get_names(int argc, char *argv[])
1.1 deraadt 46: {
1.20 ! deraadt 47: char hostname[HOST_NAME_MAX+1];
1.1 deraadt 48: char *his_name, *my_name;
49: char *my_machine_name, *his_machine_name;
1.5 pjanzen 50: char *his_tty;
1.9 mpech 51: char *cp;
1.1 deraadt 52: char *names;
1.7 hugh 53:
54: if (argc > 1 && !strcmp(argv[1], "-H")) {
55: argv[1] = argv[0];
56: ++argv;
57: --argc;
58: high_print = 1;
59: }
1.1 deraadt 60:
1.10 millert 61: if (argc > 1 && !strcmp(argv[1], "-s")) {
62: argv[1] = argv[0];
63: ++argv;
64: --argc;
65: smooth_scroll = TRUE;
66: }
67:
1.5 pjanzen 68: if ((argc < 2 ) || ('@' == argv[1][0])) {
1.17 sobrado 69: fprintf(stderr, "usage: talk [-Hs] person [ttyname]\n");
1.8 deraadt 70: exit(1);
1.4 jkatz 71: }
1.11 millert 72: if (!isatty(STDIN_FILENO))
1.6 millert 73: errx(1, "standard input must be a tty, not a pipe or a file");
1.4 jkatz 74:
1.1 deraadt 75: if ((my_name = getlogin()) == NULL) {
76: struct passwd *pw;
77:
1.6 millert 78: if ((pw = getpwuid(getuid())) == NULL)
79: errx(1, "you don't exist in the passwd file.");
1.1 deraadt 80: my_name = pw->pw_name;
81: }
82: gethostname(hostname, sizeof (hostname));
83: my_machine_name = hostname;
84: /* check for, and strip out, the machine name of the target */
85: names = strdup(argv[1]);
1.14 deraadt 86: if (names == NULL)
87: errx(1, "out of memory");
1.3 millert 88: for (cp = names; *cp && !strchr("@:!.", *cp); cp++)
1.1 deraadt 89: ;
90: if (*cp == '\0') {
91: /* this is a local to local talk */
92: his_name = names;
93: his_machine_name = my_machine_name;
94: } else {
95: if (*cp++ == '@') {
96: /* user@host */
97: his_name = names;
98: his_machine_name = cp;
99: } else {
100: /* host.user or host!user or host:user */
101: his_name = cp;
102: his_machine_name = names;
103: }
104: *--cp = '\0';
105: }
106: if (argc > 2)
107: his_tty = argv[2]; /* tty name is arg 2 */
108: else
109: his_tty = "";
110: get_addrs(my_machine_name, his_machine_name);
111: /*
112: * Initialize the message template.
113: */
114: msg.vers = TALK_VERSION;
115: msg.addr.sa_family = htons(AF_INET);
116: msg.ctl_addr.sa_family = htons(AF_INET);
117: msg.id_num = htonl(0);
118: strncpy(msg.l_name, my_name, NAME_SIZE);
119: msg.l_name[NAME_SIZE - 1] = '\0';
120: strncpy(msg.r_name, his_name, NAME_SIZE);
121: msg.r_name[NAME_SIZE - 1] = '\0';
122: strncpy(msg.r_tty, his_tty, TTY_SIZE);
123: msg.r_tty[TTY_SIZE - 1] = '\0';
1.16 otto 124: free(names);
1.1 deraadt 125: }
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