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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 #if 0 36 static char sccsid[] = "@(#)get_names.c 8.1 (Berkeley) 6/6/93"; 37 #endif 38 static const char rcsid[] = 39 "$FreeBSD: src/usr.bin/talk/get_names.c,v 1.6.2.1 2001/07/30 10:31:29 dd Exp $"; 40 #endif /* not lint */ 41 42 #include <err.h> 43 #include <pwd.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include <sys/param.h> 47 #include "talk.h" 48 49 extern CTL_MSG msg; 50 51 static void 52 usage(void) 53 { 54 fprintf(stderr, "usage: talk person [ttyname]\n"); 55 exit(1); 56 } 57 58 /* 59 * Determine the local and remote user, tty, and machines 60 */ 61 void 62 get_names(argc, argv) 63 int argc; 64 char *argv[]; 65 { 66 char hostname[MAXHOSTNAMELEN]; 67 char *his_name, *my_name; 68 char *my_machine_name, *his_machine_name; 69 char *my_tty, *his_tty; 70 register char *cp; 71 72 if (argc < 2 ) 73 usage(); 74 if (!isatty(0)) 75 errx(1, "standard input must be a tty, not a pipe or a file"); 76 if ((my_name = getlogin()) == NULL) { 77 struct passwd *pw; 78 79 if ((pw = getpwuid(getuid())) == NULL) 80 errx(1, "you don't exist. Go away"); 81 my_name = pw->pw_name; 82 } 83 gethostname(hostname, sizeof (hostname)); 84 my_machine_name = hostname; 85 /* check for, and strip out, the machine name of the target */ 86 for (cp = argv[1]; *cp && !index("@:!", *cp); cp++) 87 ; 88 if (*cp == '\0') { 89 /* this is a local to local talk */ 90 his_name = argv[1]; 91 his_machine_name = my_machine_name; 92 } else { 93 if (*cp++ == '@') { 94 /* user@host */ 95 his_name = argv[1]; 96 his_machine_name = cp; 97 } else { 98 /* host!user or host:user */ 99 his_name = cp; 100 his_machine_name = argv[1]; 101 } 102 *--cp = '\0'; 103 } 104 if (argc > 2) 105 his_tty = argv[2]; /* tty name is arg 2 */ 106 else 107 his_tty = ""; 108 get_addrs(my_machine_name, his_machine_name); 109 /* 110 * Initialize the message template. 111 */ 112 msg.vers = TALK_VERSION; 113 msg.addr.sa_family = htons(AF_INET); 114 msg.ctl_addr.sa_family = htons(AF_INET); 115 msg.id_num = htonl(0); 116 strncpy(msg.l_name, my_name, NAME_SIZE); 117 msg.l_name[NAME_SIZE - 1] = '\0'; 118 strncpy(msg.r_name, his_name, NAME_SIZE); 119 msg.r_name[NAME_SIZE - 1] = '\0'; 120 strncpy(msg.r_tty, his_tty, TTY_SIZE); 121 msg.r_tty[TTY_SIZE - 1] = '\0'; 122 } 123