1 /* $NetBSD: get_names.c,v 1.4 1994/12/09 02:14:16 jtc Exp $ */ 2 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)get_names.c 8.1 (Berkeley) 6/6/93"; 39 #endif 40 static char rcsid[] = "$NetBSD: get_names.c,v 1.4 1994/12/09 02:14:16 jtc Exp $"; 41 #endif /* not lint */ 42 43 #include <sys/param.h> 44 #include <sys/socket.h> 45 #include <protocols/talkd.h> 46 #include <pwd.h> 47 #include <string.h> 48 #include "talk.h" 49 50 char *getlogin(); 51 char *ttyname(); 52 char *rindex(); 53 extern CTL_MSG msg; 54 55 /* 56 * Determine the local and remote user, tty, and machines 57 */ 58 get_names(argc, argv) 59 int argc; 60 char *argv[]; 61 { 62 char hostname[MAXHOSTNAMELEN]; 63 char *his_name, *my_name; 64 char *my_machine_name, *his_machine_name; 65 char *my_tty, *his_tty; 66 register char *cp; 67 char *names; 68 69 if (argc < 2 ) { 70 printf("Usage: talk user [ttyname]\n"); 71 exit(-1); 72 } 73 if (!isatty(0)) { 74 printf("Standard input must be a tty, not a pipe or a file\n"); 75 exit(-1); 76 } 77 if ((my_name = getlogin()) == NULL) { 78 struct passwd *pw; 79 80 if ((pw = getpwuid(getuid())) == NULL) { 81 printf("You don't exist. Go away.\n"); 82 exit(-1); 83 } 84 my_name = pw->pw_name; 85 } 86 gethostname(hostname, sizeof (hostname)); 87 my_machine_name = hostname; 88 /* check for, and strip out, the machine name of the target */ 89 names = strdup(argv[1]); 90 for (cp = names; *cp && !index("@:!.", *cp); cp++) 91 ; 92 if (*cp == '\0') { 93 /* this is a local to local talk */ 94 his_name = names; 95 his_machine_name = my_machine_name; 96 } else { 97 if (*cp++ == '@') { 98 /* user@host */ 99 his_name = names; 100 his_machine_name = cp; 101 } else { 102 /* host.user or host!user or host:user */ 103 his_name = cp; 104 his_machine_name = names; 105 } 106 *--cp = '\0'; 107 } 108 if (argc > 2) 109 his_tty = argv[2]; /* tty name is arg 2 */ 110 else 111 his_tty = ""; 112 get_addrs(my_machine_name, his_machine_name); 113 /* 114 * Initialize the message template. 115 */ 116 msg.vers = TALK_VERSION; 117 msg.addr.sa_family = htons(AF_INET); 118 msg.ctl_addr.sa_family = htons(AF_INET); 119 msg.id_num = htonl(0); 120 strncpy(msg.l_name, my_name, NAME_SIZE); 121 msg.l_name[NAME_SIZE - 1] = '\0'; 122 strncpy(msg.r_name, his_name, NAME_SIZE); 123 msg.r_name[NAME_SIZE - 1] = '\0'; 124 strncpy(msg.r_tty, his_tty, TTY_SIZE); 125 msg.r_tty[TTY_SIZE - 1] = '\0'; 126 } 127