1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 34 __FBSDID("$FreeBSD$"); 35 36 #ifndef lint 37 static const char sccsid[] = "@(#)get_names.c 8.1 (Berkeley) 6/6/93"; 38 #endif 39 40 #include <sys/param.h> 41 42 #include <err.h> 43 #include <pwd.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include <unistd.h> 47 48 #include "talk.h" 49 50 extern CTL_MSG msg; 51 52 static void 53 usage(void) 54 { 55 fprintf(stderr, "usage: talk person [ttyname]\n"); 56 exit(1); 57 } 58 59 /* 60 * Determine the local and remote user, tty, and machines 61 */ 62 void 63 get_names(int argc, char *argv[]) 64 { 65 char hostname[MAXHOSTNAMELEN]; 66 char *his_name, *my_name; 67 const char *my_machine_name, *his_machine_name; 68 const char *his_tty; 69 char *cp; 70 71 if (argc < 2 ) 72 usage(); 73 if (!isatty(0)) 74 errx(1, "standard input must be a tty, not a pipe or a file"); 75 if ((my_name = getlogin()) == NULL) { 76 struct passwd *pw; 77 78 if ((pw = getpwuid(getuid())) == NULL) 79 errx(1, "you don't exist. Go away"); 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 cp = argv[1] + strcspn(argv[1], "@:!"); 86 if (*cp == '\0') { 87 /* this is a local to local talk */ 88 his_name = argv[1]; 89 my_machine_name = his_machine_name = "localhost"; 90 } else { 91 if (*cp++ == '@') { 92 /* user@host */ 93 his_name = argv[1]; 94 his_machine_name = cp; 95 } else { 96 /* host!user or host:user */ 97 his_name = cp; 98 his_machine_name = argv[1]; 99 } 100 *--cp = '\0'; 101 } 102 if (argc > 2) 103 his_tty = argv[2]; /* tty name is arg 2 */ 104 else 105 his_tty = ""; 106 get_addrs(my_machine_name, his_machine_name); 107 /* 108 * Initialize the message template. 109 */ 110 msg.vers = TALK_VERSION; 111 msg.addr.sa_family = htons(AF_INET); 112 msg.ctl_addr.sa_family = htons(AF_INET); 113 msg.id_num = htonl(0); 114 strlcpy(msg.l_name, my_name, NAME_SIZE); 115 strlcpy(msg.r_name, his_name, NAME_SIZE); 116 strlcpy(msg.r_tty, his_tty, TTY_SIZE); 117 } 118