1 /* $OpenBSD: get_names.c,v 1.8 2001/03/09 03:19:52 deraadt Exp $ */ 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 41 static char rcsid[] = "$OpenBSD: get_names.c,v 1.8 2001/03/09 03:19:52 deraadt Exp $"; 42 #endif /* not lint */ 43 44 #include "talk.h" 45 #include <sys/param.h> 46 #include <pwd.h> 47 #include <unistd.h> 48 49 extern CTL_MSG msg; 50 51 /* 52 * Determine the local and remote user, tty, and machines 53 */ 54 void 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; 62 char *his_tty; 63 register char *cp; 64 char *names; 65 66 if (argc > 1 && !strcmp(argv[1], "-H")) { 67 argv[1] = argv[0]; 68 ++argv; 69 --argc; 70 high_print = 1; 71 } 72 73 if ((argc < 2 ) || ('@' == argv[1][0])) { 74 fprintf(stderr, "usage: talk user [ttyname]\n" 75 " talk user@hostname [ttyname]\n"); 76 exit(1); 77 } 78 if (!isatty(0)) 79 errx(1, "standard input must be a tty, not a pipe or a file"); 80 81 if ((my_name = getlogin()) == NULL) { 82 struct passwd *pw; 83 84 if ((pw = getpwuid(getuid())) == NULL) 85 errx(1, "you don't exist in the passwd file."); 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]); 92 for (cp = names; *cp && !strchr("@:!.", *cp); cp++) 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 } 129