138 lines
3.3 KiB
C
138 lines
3.3 KiB
C
/* $NetBSD: get_names.c,v 1.6 2001/02/05 00:42:15 christos Exp $ */
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/*
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* Copyright (c) 1983 Regents of the University of California.
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* All rights reserved. The Berkeley software License Agreement
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* specifies the terms and conditions for redistribution.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: get_names.c,v 1.6 2001/02/05 00:42:15 christos Exp $");
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#endif /* not lint */
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#include "bsd.h"
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#if defined(TALK_43) || defined(TALK_42)
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# include <sys/param.h>
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# include <netdb.h>
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# include <stdio.h>
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# include <stdlib.h>
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# include <string.h>
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# include <unistd.h>
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# include "hunt.h"
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# include "talk_ctl.h"
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static char hostname[MAXHOSTNAMELEN + 1];
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char *my_machine_name;
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/*
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* Determine the local user and machine
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*/
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void
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get_local_name(my_name)
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char *my_name;
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{
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struct hostent *hp;
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struct servent *sp;
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/* Load these useful values into the standard message header */
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msg.id_num = 0;
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(void) strncpy(msg.l_name, my_name, NAME_SIZE);
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msg.l_name[NAME_SIZE - 1] = '\0';
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msg.r_tty[0] = '\0';
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msg.pid = getpid();
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# ifdef TALK_43
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msg.vers = TALK_VERSION;
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msg.addr.sa_family = htons(AF_INET);
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msg.ctl_addr.sa_family = htons(AF_INET);
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# else
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msg.addr.sin_family = htons(AF_INET);
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msg.ctl_addr.sin_family = htons(AF_INET);
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# endif
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(void)gethostname(hostname, sizeof (hostname));
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hostname[sizeof(hostname) - 1] = '\0';
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my_machine_name = hostname;
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/* look up the address of the local host */
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hp = gethostbyname(my_machine_name);
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if (hp == (struct hostent *) 0) {
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# ifdef LOG
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syslog(LOG_ERR,
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"This machine doesn't exist. Boy, am I confused!");
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# else
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perror("This machine doesn't exist. Boy, am I confused!");
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# endif
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exit(1);
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}
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memcpy(&my_machine_addr, hp->h_addr, hp->h_length);
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/* find the daemon portal */
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# ifdef TALK_43
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sp = getservbyname("ntalk", "udp");
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# else
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sp = getservbyname("talk", "udp");
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# endif
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if (sp == 0) {
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# ifdef LOG
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syslog(LOG_ERR, "This machine doesn't support talk");
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# else
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perror("This machine doesn't support talk");
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# endif
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exit(1);
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}
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daemon_port = sp->s_port;
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}
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/*
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* Determine the remote user and machine
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*/
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int
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get_remote_name(his_address)
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char *his_address;
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{
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char *his_name;
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char *his_machine_name;
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char *ptr;
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struct hostent *hp;
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/* check for, and strip out, the machine name of the target */
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for (ptr = his_address; *ptr != '\0' && *ptr != '@' && *ptr != ':'
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&& *ptr != '!' && *ptr != '.'; ptr++)
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continue;
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if (*ptr == '\0') {
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/* this is a local to local talk */
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his_name = his_address;
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his_machine_name = my_machine_name;
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} else {
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if (*ptr == '@') {
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/* user@host */
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his_name = his_address;
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his_machine_name = ptr + 1;
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} else {
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/* host.user or host!user or host:user */
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his_name = ptr + 1;
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his_machine_name = his_address;
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}
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*ptr = '\0';
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}
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/* Load these useful values into the standard message header */
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(void) strncpy(msg.r_name, his_name, NAME_SIZE);
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msg.r_name[NAME_SIZE - 1] = '\0';
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/* if he is on the same machine, then simply copy */
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if (memcmp((char *) &his_machine_name, (char *) &my_machine_name,
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sizeof(his_machine_name)) == 0)
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memcpy(&his_machine_addr, &my_machine_addr,
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sizeof(his_machine_name));
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else {
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/* look up the address of the recipient's machine */
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hp = gethostbyname(his_machine_name);
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if (hp == (struct hostent *) 0)
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return 0; /* unknown host */
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memcpy(&his_machine_addr, hp->h_addr, hp->h_length);
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}
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return 1;
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}
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#endif
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