diff options
Diffstat (limited to 'usr.bin/talk/get_names.c')
| -rw-r--r-- | usr.bin/talk/get_names.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/usr.bin/talk/get_names.c b/usr.bin/talk/get_names.c new file mode 100644 index 0000000..5400548 --- /dev/null +++ b/usr.bin/talk/get_names.c @@ -0,0 +1,124 @@ +/* $NetBSD: get_names.c,v 1.16 2012/12/29 23:44:23 christos Exp $ */ + +/* + * 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. + */ + +#include <sys/cdefs.h> +#ifndef lint +#if 0 +static char sccsid[] = "@(#)get_names.c 8.1 (Berkeley) 6/6/93"; +#endif +__RCSID("$NetBSD: get_names.c,v 1.16 2012/12/29 23:44:23 christos Exp $"); +#endif /* not lint */ + +#include "talk.h" +#include <err.h> +#include <sys/param.h> +#include <pwd.h> +#include <stdlib.h> +#include <unistd.h> +#include <util.h> + +extern CTL_MSG msg; + +/* + * Determine the local and remote user, tty, and machines + */ +void +get_names(int argc, char *argv[]) +{ + char hostname[MAXHOSTNAMELEN + 1]; + const char *his_name, *my_name; + const char *my_machine_name, *his_machine_name; + const char *his_tty; + char *cp; + char *names; + + if (argc < 2 ) { + fprintf(stderr, "Usage: %s user [ttyname]\n", getprogname()); + exit(1); + } + if (!isatty(0)) + errx(EXIT_FAILURE, "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(EXIT_FAILURE, "You don't exist. Go away."); + my_name = pw->pw_name; + } + if ((cp = getenv("TALKHOST")) != NULL) + (void)estrlcpy(hostname, cp, sizeof(hostname)); + else { + if (gethostname(hostname, sizeof(hostname)) == -1) + err(EXIT_FAILURE, "gethostname"); + hostname[sizeof(hostname) - 1] = '\0'; + } + my_machine_name = hostname; + /* check for, and strip out, the machine name of the target */ + names = strdup(argv[1]); + for (cp = names; *cp && !strchr("@:!.", *cp); cp++) + ; + if (*cp == '\0') { + /* this is a local to local talk */ + his_name = names; + his_machine_name = my_machine_name; + } else { + if (*cp++ == '@') { + /* user@host */ + his_name = names; + his_machine_name = cp; + } else { + /* host.user or host!user or host:user */ + his_name = cp; + his_machine_name = names; + } + *--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'; + free(names); +} |