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 * 3. 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 * @(#)get_names.c 8.1 (Berkeley) 6/6/93 30 * $FreeBSD: src/usr.bin/talk/get_names.c,v 1.6.2.1 2001/07/30 10:31:29 dd Exp $ 31 */ 32 33 #include <err.h> 34 #include <pwd.h> 35 #include <stdlib.h> 36 #include <string.h> 37 #include <sys/param.h> 38 #include "talk.h" 39 40 extern CTL_MSG msg; 41 42 static void 43 usage(void) 44 { 45 fprintf(stderr, "usage: talk person [ttyname]\n"); 46 exit(1); 47 } 48 49 /* 50 * Determine the local and remote user, tty, and machines 51 */ 52 void 53 get_names(int argc, char **argv) 54 { 55 char hostname[MAXHOSTNAMELEN]; 56 char *his_name, *my_name; 57 char *my_machine_name, *his_machine_name; 58 const char *his_tty; 59 char *cp; 60 61 if (argc < 2 ) 62 usage(); 63 if (!isatty(0)) 64 errx(1, "standard input must be a tty, not a pipe or a file"); 65 if ((my_name = getlogin()) == NULL) { 66 struct passwd *pw; 67 68 if ((pw = getpwuid(getuid())) == NULL) 69 errx(1, "you don't exist. Go away"); 70 my_name = pw->pw_name; 71 } 72 gethostname(hostname, sizeof (hostname)); 73 my_machine_name = hostname; 74 /* check for, and strip out, the machine name of the target */ 75 for (cp = argv[1]; *cp && !strchr("@:!", *cp); cp++) 76 ; 77 if (*cp == '\0') { 78 /* this is a local to local talk */ 79 his_name = argv[1]; 80 his_machine_name = my_machine_name; 81 } else { 82 if (*cp++ == '@') { 83 /* user@host */ 84 his_name = argv[1]; 85 his_machine_name = cp; 86 } else { 87 /* host!user or host:user */ 88 his_name = cp; 89 his_machine_name = argv[1]; 90 } 91 *--cp = '\0'; 92 } 93 if (argc > 2) 94 his_tty = argv[2]; /* tty name is arg 2 */ 95 else 96 his_tty = ""; 97 get_addrs(my_machine_name, his_machine_name); 98 /* 99 * Initialize the message template. 100 */ 101 msg.vers = TALK_VERSION; 102 msg.addr.sa_family = htons(AF_INET); 103 msg.ctl_addr.sa_family = htons(AF_INET); 104 msg.id_num = htonl(0); 105 strncpy(msg.l_name, my_name, NAME_SIZE); 106 msg.l_name[NAME_SIZE - 1] = '\0'; 107 strncpy(msg.r_name, his_name, NAME_SIZE); 108 msg.r_name[NAME_SIZE - 1] = '\0'; 109 strncpy(msg.r_tty, his_tty, TTY_SIZE); 110 msg.r_tty[TTY_SIZE - 1] = '\0'; 111 } 112