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 static char sccsid[] = "@(#)get_names.c 8.1 (Berkeley) 6/6/93"; 36 #endif /* not lint */ 37 38 #include <sys/param.h> 39 #include <sys/socket.h> 40 #include <protocols/talkd.h> 41 #include <pwd.h> 42 #include "talk.h" 43 44 char *getlogin(); 45 char *ttyname(); 46 char *rindex(); 47 extern CTL_MSG msg; 48 49 /* 50 * Determine the local and remote user, tty, and machines 51 */ 52 get_names(argc, argv) 53 int argc; 54 char *argv[]; 55 { 56 char hostname[MAXHOSTNAMELEN]; 57 char *his_name, *my_name; 58 char *my_machine_name, *his_machine_name; 59 char *my_tty, *his_tty; 60 register char *cp; 61 62 if (argc < 2 ) { 63 printf("Usage: talk user [ttyname]\n"); 64 exit(-1); 65 } 66 if (!isatty(0)) { 67 printf("Standard input must be a tty, not a pipe or a file\n"); 68 exit(-1); 69 } 70 if ((my_name = getlogin()) == NULL) { 71 struct passwd *pw; 72 73 if ((pw = getpwuid(getuid())) == NULL) { 74 printf("You don't exist. Go away.\n"); 75 exit(-1); 76 } 77 my_name = pw->pw_name; 78 } 79 gethostname(hostname, sizeof (hostname)); 80 my_machine_name = hostname; 81 /* check for, and strip out, the machine name of the target */ 82 for (cp = argv[1]; *cp && !index("@:!", *cp); cp++) 83 ; 84 if (*cp == '\0') { 85 /* this is a local to local talk */ 86 his_name = argv[1]; 87 his_machine_name = my_machine_name; 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 strncpy(msg.l_name, my_name, NAME_SIZE); 113 msg.l_name[NAME_SIZE - 1] = '\0'; 114 strncpy(msg.r_name, his_name, NAME_SIZE); 115 msg.r_name[NAME_SIZE - 1] = '\0'; 116 strncpy(msg.r_tty, his_tty, TTY_SIZE); 117 msg.r_tty[TTY_SIZE - 1] = '\0'; 118 } 119