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chat.c
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/*
Eagles Bulletin Board System
Copyright (C) 1995, Ray Rocker, [email protected]
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "server.h"
#include <signal.h>
#include <errno.h> /* this may be just temporary */
#include <sys/socket.h>
#include <netinet/in.h>
#ifdef NeXT
# include <sys/wait.h>
# include <sys/time.h>
# include <sys/resource.h>
# define waitpid wait3
#endif
#ifndef INADDR_LOOPBACK
# define INADDR_LOOPBACK 0x7f000001
#endif
extern SERVERDATA server;
int chatfd = -1;
int inchat = 0;
unsigned short
_read_daemoninfo(fname)
char *fname;
{
FILE *fp;
char buf[5];
unsigned short number;
if ((fp = fopen(fname, "r")) == NULL) {
return 0;
}
fgets(buf, sizeof buf, fp);
buf[4] = '\0';
number = (unsigned short)hex2SHORT(buf);
fclose(fp);
return number;
}
_start_chat_daemon()
{
int pid;
char *argv0 = "bbs.chatd";
char argv1[8];
sprintf(argv1, "%d", server.maxutable);
switch (pid = fork()) {
case -1:
return -1;
case 0:
execl(PATH_CHATD, argv0, argv1, NULL);
bbslog(0, "ERROR _start_chat_daemon: execl failed: %s\n", PATH_CHATD);
exit(1);
default:
/* The chat daemon forks so we can wait on it here. */
waitpid(pid, NULL, 0);
}
return 0;
}
local_bbs_chat(chatid, pfd)
char *chatid;
LONG *pfd;
{
CHATLINE sendbuf;
int rc, daemon_started = 0;
unsigned short port;
if (inchat) return S_OK;
if (my_real_mode() == M_TALK) return S_MODEVIOLATION;
if (chatfd == -1) {
int s;
struct sockaddr_in sin;
setupchat:
memset(&sin, 0, sizeof sin);
sin.sin_family = PF_INET;
sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
sin.sin_port = port = ntohs(_read_daemoninfo(PATH_CHATPORT));
if (sin.sin_port == 0) {
_start_chat_daemon();
daemon_started++;
sin.sin_port = port = ntohs(_read_daemoninfo(PATH_CHATPORT));
if (sin.sin_port == 0) {
return S_SYSERR;
}
}
if ((s = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
bbslog(0, "ERROR local_bbs_chat: socket failed\n");
return S_SYSERR;
}
rc = connect(s, (struct sockaddr *)&sin, sizeof sin);
if (rc == -1) {
if (errno == SIGINT) goto setupchat;
bbslog(0, "ERROR local_bbs_chat: connect failed: errno %d\n", errno);
if (!daemon_started) {
unsigned long currport;
close(s);
currport = ntohs(_read_daemoninfo(PATH_CHATPORT));
if (currport == port) {
/* We may have crashed and left the chatport file there.
Try to kill the running daemon if it's hung. */
pid_t pid = (pid_t)_read_daemoninfo(PATH_CHATPID);
if (pid > 0) kill(pid, SIGQUIT);
_start_chat_daemon();
daemon_started++;
}
goto setupchat;
}
close(s);
return S_SYSERR;
}
chatfd = s;
}
set_real_mode(M_CHAT);
sprintf(sendbuf, "/! %d %s\n", my_utable_slot(), chatid);
if (send(chatfd, sendbuf, strlen(sendbuf), 0) != strlen(sendbuf)) {
local_bbs_exit_chat();
bbslog(0, "ERROR local_bbs_chat: send failed\n");
return S_SYSERR;
}
if (recv(chatfd, sendbuf, 3, 0) != 3) {
local_bbs_exit_chat();
bbslog(0, "ERROR local_bbs_chat: recv failed\n");
return S_SYSERR;
}
if (!strcmp(sendbuf, CHAT_LOGIN_OK)) {
inchat = 1;
*pfd = (LONG)chatfd;
bbslog(4, "CHAT ENTER %s as %s\n", my_userid(), chatid);
return S_OK;
}
else if (!strcmp(sendbuf, CHAT_LOGIN_EXISTS)) {
set_real_mode(M_UNDEFINED);
return S_CHATIDINUSE;
}
else if (!strcmp(sendbuf, CHAT_LOGIN_INVALID)) {
set_real_mode(M_UNDEFINED);
return S_BADCHATID;
}
/* else, server really didn't like us */
local_bbs_exit_chat();
bbslog(0, "ERROR local_bbs_chat: daemon sent back '%s'\n", sendbuf);
return S_CHATDERROR;
}
local_bbs_exit_chat()
{
if (chatfd != -1) {
close(chatfd);
chatfd = -1;
inchat = 0;
set_real_mode(M_UNDEFINED);
bbslog(4, "CHAT EXIT %s\n", my_userid());
}
return S_OK;
}
local_bbs_chat_send(buf)
char *buf;
{
int len = strlen(buf);
if (chatfd == -1 || inchat == 0) return S_DENIED;
if (send(chatfd, buf, len, 0) != len) {
local_bbs_exit_chat();
bbslog(0, "ERROR local_bbs_chat_send: send failed\n");
return S_SYSERR;
}
return S_OK;
}
remote_bbs_chat(chatid, pport, magicstr)
char *chatid;
unsigned short *pport;
char *magicstr;
{
/* Assumes magicstr is big enough (should be 256 chars) */
int daemon_started = 0;
unsigned short port;
pid_t pid;
if (inchat) return S_OK;
if (my_real_mode() == M_TALK) return S_MODEVIOLATION;
pid = (pid_t)_read_daemoninfo(PATH_CHATPID);
if (pid == 0 || kill(pid, 0) == -1) {
_start_chat_daemon();
daemon_started++;
}
port = ntohs(_read_daemoninfo(PATH_CHATPORT));
if (port == 0) {
if (daemon_started == 0) {
_start_chat_daemon();
daemon_started++;
port = ntohs(_read_daemoninfo(PATH_CHATPORT));
}
if (port == 0) {
return S_SYSERR;
}
}
sprintf(magicstr, "/! %d %s\n", my_utable_slot(), chatid);
bbslog(4, "CHAT ENTER %s as %s\n", my_userid(), chatid);
*pport = port;
inchat = 1;
set_real_mode(M_CHAT);
return S_OK;
}
remote_bbs_exit_chat()
{
if (inchat) {
inchat = 0;
set_real_mode(M_UNDEFINED);
bbslog(4, "CHAT EXIT %s\n", my_userid());
}
return S_OK;
}