1 /* 2 * Copyright (c) 1983 Regents of the University of California. 3 * 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 /*static char sccsid[] = "from: @(#)get_names.c 5.9 (Berkeley) 3/1/91";*/ 36 static char rcsid[] = "$Id: get_names.c,v 1.2 1993/08/01 18:07:51 mycroft Exp $"; 37 #endif /* not lint */ 38 39 #include <sys/param.h> 40 #include <sys/socket.h> 41 #include <protocols/talkd.h> 42 #include <pwd.h> 43 #include "talk.h" 44 45 char *getlogin(); 46 char *ttyname(); 47 char *rindex(); 48 extern CTL_MSG msg; 49 50 /* 51 * Determine the local and remote user, tty, and machines 52 */ 53 get_names(argc, argv) 54 int argc; 55 char *argv[]; 56 { 57 char hostname[MAXHOSTNAMELEN]; 58 char *his_name, *my_name; 59 char *my_machine_name, *his_machine_name; 60 char *my_tty, *his_tty; 61 register char *cp; 62 63 if (argc < 2 ) { 64 printf("Usage: talk user [ttyname]\n"); 65 exit(-1); 66 } 67 if (!isatty(0)) { 68 printf("Standard input must be a tty, not a pipe or a file\n"); 69 exit(-1); 70 } 71 if ((my_name = getlogin()) == NULL) { 72 struct passwd *pw; 73 74 if ((pw = getpwuid(getuid())) == NULL) { 75 printf("You don't exist. Go away.\n"); 76 exit(-1); 77 } 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 for (cp = argv[1]; *cp && !index("@:!.", *cp); cp++) 84 ; 85 if (*cp == '\0') { 86 /* this is a local to local talk */ 87 his_name = argv[1]; 88 his_machine_name = my_machine_name; 89 } else { 90 if (*cp++ == '@') { 91 /* user@host */ 92 his_name = argv[1]; 93 his_machine_name = cp; 94 } else { 95 /* host.user or host!user or host:user */ 96 his_name = cp; 97 his_machine_name = argv[1]; 98 } 99 *--cp = '\0'; 100 } 101 if (argc > 2) 102 his_tty = argv[2]; /* tty name is arg 2 */ 103 else 104 his_tty = ""; 105 get_addrs(my_machine_name, his_machine_name); 106 /* 107 * Initialize the message template. 108 */ 109 msg.vers = TALK_VERSION; 110 msg.addr.sa_family = htons(AF_INET); 111 msg.ctl_addr.sa_family = htons(AF_INET); 112 msg.id_num = htonl(0); 113 strncpy(msg.l_name, my_name, NAME_SIZE); 114 msg.l_name[NAME_SIZE - 1] = '\0'; 115 strncpy(msg.r_name, his_name, NAME_SIZE); 116 msg.r_name[NAME_SIZE - 1] = '\0'; 117 strncpy(msg.r_tty, his_tty, TTY_SIZE); 118 msg.r_tty[TTY_SIZE - 1] = '\0'; 119 } 120