Annotation of src/usr.bin/talk/get_names.c, Revision 1.21
1.21 ! mestre 1: /* $OpenBSD: get_names.c,v 1.20 2015/01/16 06:40:13 deraadt 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:
1.21 ! mestre 33: #include <sys/socket.h>
! 34:
! 35: #include <err.h>
! 36: #include <limits.h>
1.1 deraadt 37: #include <pwd.h>
1.13 david 38: #include <stdlib.h>
1.21 ! mestre 39: #include <string.h>
1.5 pjanzen 40: #include <unistd.h>
1.21 ! mestre 41:
! 42: #include "talk.h"
1.1 deraadt 43:
44: extern CTL_MSG msg;
45:
46: /*
47: * Determine the local and remote user, tty, and machines
48: */
1.5 pjanzen 49: void
1.19 tedu 50: get_names(int argc, char *argv[])
1.1 deraadt 51: {
1.20 deraadt 52: char hostname[HOST_NAME_MAX+1];
1.1 deraadt 53: char *his_name, *my_name;
54: char *my_machine_name, *his_machine_name;
1.5 pjanzen 55: char *his_tty;
1.9 mpech 56: char *cp;
1.1 deraadt 57: char *names;
1.7 hugh 58:
59: if (argc > 1 && !strcmp(argv[1], "-H")) {
60: argv[1] = argv[0];
61: ++argv;
62: --argc;
63: high_print = 1;
64: }
1.1 deraadt 65:
1.10 millert 66: if (argc > 1 && !strcmp(argv[1], "-s")) {
67: argv[1] = argv[0];
68: ++argv;
69: --argc;
70: smooth_scroll = TRUE;
71: }
72:
1.5 pjanzen 73: if ((argc < 2 ) || ('@' == argv[1][0])) {
1.21 ! mestre 74: extern char *__progname;
! 75: fprintf(stderr, "usage: %s [-Hs] person [ttyname]\n", __progname);
1.8 deraadt 76: exit(1);
1.4 jkatz 77: }
1.11 millert 78: if (!isatty(STDIN_FILENO))
1.6 millert 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]);
1.14 deraadt 92: if (names == NULL)
93: errx(1, "out of memory");
1.3 millert 94: for (cp = names; *cp && !strchr("@:!.", *cp); cp++)
1.1 deraadt 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';
1.16 otto 130: free(names);
1.1 deraadt 131: }
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