1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 32 __FBSDID("$FreeBSD$"); 33 34 #ifndef lint 35 static const char sccsid[] = "@(#)get_names.c 8.1 (Berkeley) 6/6/93"; 36 #endif 37 38 #include <sys/param.h> 39 40 #include <err.h> 41 #include <pwd.h> 42 #include <stdlib.h> 43 #include <string.h> 44 #include <unistd.h> 45 46 #include "talk.h" 47 48 extern CTL_MSG msg; 49 50 static void 51 usage(void) 52 { 53 fprintf(stderr, "usage: talk person [ttyname]\n"); 54 exit(1); 55 } 56 57 /* 58 * Determine the local and remote user, tty, and machines 59 */ 60 void 61 get_names(int argc, char *argv[]) 62 { 63 char hostname[MAXHOSTNAMELEN]; 64 char *his_name, *my_name; 65 const char *my_machine_name, *his_machine_name; 66 const char *his_tty; 67 char *cp; 68 69 if (argc < 2 ) 70 usage(); 71 if (!isatty(0)) 72 errx(1, "standard input must be a tty, not a pipe or a file"); 73 if ((my_name = getlogin()) == NULL) { 74 struct passwd *pw; 75 76 if ((pw = getpwuid(getuid())) == NULL) 77 errx(1, "you don't exist. Go away"); 78 my_name = pw->pw_name; 79 } 80 gethostname(hostname, sizeof (hostname)); 81 my_machine_name = hostname; 82 /* check for, and strip out, the machine name of the target */ 83 cp = argv[1] + strcspn(argv[1], "@:!"); 84 if (*cp == '\0') { 85 /* this is a local to local talk */ 86 his_name = argv[1]; 87 my_machine_name = his_machine_name = "localhost"; 88 } else { 89 if (*cp++ == '@') { 90 /* user@host */ 91 his_name = argv[1]; 92 his_machine_name = cp; 93 } else { 94 /* host!user or host:user */ 95 his_name = cp; 96 his_machine_name = argv[1]; 97 } 98 *--cp = '\0'; 99 } 100 if (argc > 2) 101 his_tty = argv[2]; /* tty name is arg 2 */ 102 else 103 his_tty = ""; 104 get_addrs(my_machine_name, his_machine_name); 105 /* 106 * Initialize the message template. 107 */ 108 msg.vers = TALK_VERSION; 109 msg.addr.sa_family = htons(AF_INET); 110 msg.ctl_addr.sa_family = htons(AF_INET); 111 msg.id_num = htonl(0); 112 strlcpy(msg.l_name, my_name, NAME_SIZE); 113 strlcpy(msg.r_name, his_name, NAME_SIZE); 114 strlcpy(msg.r_tty, his_tty, TTY_SIZE); 115 } 116