1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 1997 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */ 28 /* All Rights Reserved */ 29 30 /* 31 * University Copyright- Copyright (c) 1982, 1986, 1988 32 * The Regents of the University of California 33 * All Rights Reserved 34 * 35 * University Acknowledgment- Portions of this document are derived from 36 * software developed by the University of California, Berkeley, and its 37 * contributors. 38 */ 39 40 #pragma ident "%Z%%M% %I% %E% SMI" 41 42 #include "talk.h" 43 #include "ctl.h" 44 #include <locale.h> 45 #include <pwd.h> 46 #include <sys/systeminfo.h> 47 48 char *getlogin(), *ttyname(int); 49 50 extern CTL_MSG msg; 51 52 /* 53 * Determine the local and remote user, tty, and machines 54 */ 55 56 struct hostent *gethostbyname(); 57 58 void 59 get_names(argc, argv) 60 int argc; 61 char *argv[]; 62 { 63 char hostname[HOST_NAME_LENGTH + 1]; 64 char *rem_name; 65 char *my_name; 66 char *my_machine_name; 67 char *rem_machine_name; 68 char *my_tty; 69 char *rem_tty; 70 char *ptr; 71 int name_length; 72 73 if (argc < 2) { 74 fprintf(stderr, 75 "Usage: talk %s\n", gettext("address [terminal]")); 76 exit(1); 77 } 78 if (!isatty(0)) { 79 fprintf(stderr, 80 gettext("Standard input must be a tty, not a pipe or a file\n")); 81 exit(1); 82 } 83 84 if (!isatty(1)) { 85 fprintf(stderr, 86 gettext("Standard output must be a tty, not a pipe or a file\n")); 87 exit(1); 88 } 89 90 if ((my_name = getlogin()) == NULL) { 91 struct passwd *pass = getpwuid(getuid()); 92 if (pass != NULL) 93 my_name = pass->pw_name; 94 } 95 if (my_name == NULL) { 96 fprintf(stderr, 97 gettext("Who are you? You have no entry in /etc/utmp! Aborting..\n")); 98 exit(1); 99 } 100 101 name_length = HOST_NAME_LENGTH; 102 (void) sysinfo(SI_HOSTNAME, hostname, name_length); 103 my_machine_name = hostname; 104 105 my_tty = strrchr(ttyname(0), '/') + 1; 106 107 /* 108 * check for, and strip out, the machine name of the target 109 */ 110 111 for (ptr = argv[1]; *ptr != '\0' && 112 *ptr != '@' && 113 *ptr != ':' && 114 *ptr != '!' && 115 *ptr != '.'; ptr++) { 116 } 117 118 if (*ptr == '\0') { 119 120 /* this is a local to local talk */ 121 122 rem_name = argv[1]; 123 rem_machine_name = my_machine_name; 124 125 } else { 126 127 if (*ptr == '@') { 128 /* user@host */ 129 rem_name = argv[1]; 130 rem_machine_name = ptr + 1; 131 } else { 132 /* host.user or host!user or host:user */ 133 rem_name = ptr + 1; 134 rem_machine_name = argv[1]; 135 } 136 *ptr = '\0'; 137 } 138 139 140 if (argc > 2) { 141 rem_tty = argv[2]; /* tty name is arg 2 */ 142 } else { 143 rem_tty = ""; 144 } 145 146 get_addrs(my_machine_name, rem_machine_name); 147 148 /* Load these useful values into the standard message header */ 149 150 msg.id_num = 0; 151 152 strncpy(msg.l_name, my_name, NAME_SIZE); 153 msg.l_name[NAME_SIZE - 1] = '\0'; 154 155 strncpy(msg.r_name, rem_name, NAME_SIZE); 156 msg.r_name[NAME_SIZE - 1] = '\0'; 157 158 strncpy(msg.r_tty, rem_tty, TTY_SIZE); 159 msg.r_tty[TTY_SIZE - 1] = '\0'; 160 } 161