/* * Copyright (c) 1983, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)get_names.c 8.1 (Berkeley) 6/6/93 * $FreeBSD: src/usr.bin/talk/get_names.c,v 1.6.2.1 2001/07/30 10:31:29 dd Exp $ */ #include #include #include #include #include #include "talk.h" extern CTL_MSG msg; static void usage(void) { fprintf(stderr, "usage: talk person [ttyname]\n"); exit(1); } /* * Determine the local and remote user, tty, and machines */ void get_names(int argc, char **argv) { char hostname[MAXHOSTNAMELEN]; char *his_name, *my_name; char *my_machine_name, *his_machine_name; const char *his_tty; char *cp; if (argc < 2 ) usage(); if (!isatty(0)) errx(1, "standard input must be a tty, not a pipe or a file"); if ((my_name = getlogin()) == NULL) { struct passwd *pw; if ((pw = getpwuid(getuid())) == NULL) errx(1, "you don't exist. Go away"); my_name = pw->pw_name; } gethostname(hostname, sizeof (hostname)); my_machine_name = hostname; /* check for, and strip out, the machine name of the target */ for (cp = argv[1]; *cp && !strchr("@:!", *cp); cp++) ; if (*cp == '\0') { /* this is a local to local talk */ his_name = argv[1]; his_machine_name = my_machine_name; } else { if (*cp++ == '@') { /* user@host */ his_name = argv[1]; his_machine_name = cp; } else { /* host!user or host:user */ his_name = cp; his_machine_name = argv[1]; } *--cp = '\0'; } if (argc > 2) his_tty = argv[2]; /* tty name is arg 2 */ else his_tty = ""; get_addrs(my_machine_name, his_machine_name); /* * Initialize the message template. */ msg.vers = TALK_VERSION; msg.addr.sa_family = htons(AF_INET); msg.ctl_addr.sa_family = htons(AF_INET); msg.id_num = htonl(0); strncpy(msg.l_name, my_name, NAME_SIZE); msg.l_name[NAME_SIZE - 1] = '\0'; strncpy(msg.r_name, his_name, NAME_SIZE); msg.r_name[NAME_SIZE - 1] = '\0'; strncpy(msg.r_tty, his_tty, TTY_SIZE); msg.r_tty[TTY_SIZE - 1] = '\0'; }