mailsrvr.c

		if(msgtxt!=NULL) {
			smb_freemsgtxt(msgtxt);
			msgtxt=NULL;
		}

		smb_freemsgmem(&msg);

		mswait(3000);

		sprintf(smb.file,"%smail",scfg.data_dir);
		if((i=smb_open(&smb))!=0) 
			continue;
		if((i=smb_locksmbhdr(&smb))!=0)
			continue;
		if((i=smb_getstatus(&smb))!=0) {
			smb_unlocksmbhdr(&smb);
			continue;
		}
		smb_unlocksmbhdr(&smb);
		if(smb.status.last_msg==last_msg && time(NULL)-last_scan<startup->rescan_frequency)
			continue;
		last_msg=smb.status.last_msg;
		last_scan=time(NULL);
		total_msgs=smb.status.total_msgs;
		smb_rewind(smb.sid_fp);
		for(offset=0;offset<total_msgs;offset++) {

			if(active_sendmail!=0) {
				active_sendmail=0;
				update_clients();
			}

			if(sock!=INVALID_SOCKET) {
				mail_close_socket(sock);
				sock=INVALID_SOCKET;
			}

			if(msgtxt!=NULL) {
				smb_freemsgtxt(msgtxt);
				msgtxt=NULL;
			}

			smb_freemsgmem(&msg);

			smb_fseek(smb.sid_fp, offset*sizeof(msg.idx), SEEK_SET);
			if(smb_fread(&msg.idx, sizeof(msg.idx), smb.sid_fp) != sizeof(msg.idx))
				break;
			if(msg.idx.attr&MSG_DELETE)	/* Marked for deletion */
				continue;
			if(msg.idx.to)	/* Local */
				continue;
			msg.offset=offset;

			if((i=smb_lockmsghdr(&smb,&msg))!=0) {
				lprintf("0000 !SEND ERROR %d locking message header #%lu"
					,i,msg.idx.number);
				continue;
			}
			if((i=smb_getmsghdr(&smb,&msg))!=0) {
				smb_unlockmsghdr(&smb,&msg);
				lprintf("0000 !SEND ERROR %d reading message header #%lu"
					,i,msg.idx.number);
				continue; 
			}
			smb_unlockmsghdr(&smb,&msg);

			if(msg.to_net.type!=NET_INTERNET) 
				continue;

			active_sendmail=1;
			update_clients();

			lprintf("0000 SEND Message #%lu from %s to %s"
				,msg.hdr.number, msg.from, msg.to_net.addr);
			status("SendMail");
#ifdef _WIN32
			if(startup->outbound_sound[0] && !(startup->options&MAIL_OPT_MUTE)) 
				PlaySound(startup->outbound_sound, NULL, SND_ASYNC|SND_FILENAME);
#endif

			lprintf("0000 SEND getting message text");
			if((msgtxt=smb_getmsgtxt(&smb,&msg,GETMSGTXT_TAILS))==NULL) {
				lprintf("0000 !SEND ERROR retrieving message text");
				continue;
			}

			if(startup->options&MAIL_OPT_RELAY_TX)  
				server=startup->relay_server;
			else {
				sprintf(to,"%.*s",(int)sizeof(to)-1,(char*)msg.to_net.addr);
				p=strrchr(to,'>');	/* Truncate '>' */
				if(p!=NULL) *p=0;

				p=strrchr(to,'@');
				if(p==NULL) {
					lprintf("0000 !SEND INVALID destination address: %s", to);
					sprintf(err,"Invalid destination address: %s", to);
					bounce(&smb,&msg,err,TRUE);
					continue;
				}
				if((dns=resolve_ip(startup->dns_server))==0) 
					continue;
				p++;
				lprintf("0000 SEND getting MX records for %s from %s",p,startup->dns_server);
				if((i=dns_getmx(p, mx, mx2, startup->interface_addr, dns
					,startup->options&MAIL_OPT_USE_TCP_DNS ? TRUE : FALSE
					,TIMEOUT_THREAD_WAIT/2))!=0) {
					lprintf("0000 !SEND ERROR %d obtaining MX records for %s from %s"
						,i,p,startup->dns_server);
					sprintf(err,"Error %d obtaining MX record for %s",i,p);
					bounce(&smb,&msg,err,FALSE);
					continue;
				}
				server=mx;
			}


			lprintf("0000 SEND opening socket");
			if((sock=mail_open_socket(SOCK_STREAM))==INVALID_SOCKET) {
				lprintf("0000 !SEND ERROR %d opening socket", ERROR_VALUE);
				continue;
			}

			lprintf("%04d SEND socket opened",sock);

			memset(&addr,0,sizeof(addr));
			addr.sin_addr.s_addr = htonl(startup->interface_addr);
			addr.sin_family = AF_INET;

			lprintf("%04d SEND binding socket",sock);
			if((i=bind(sock, (struct sockaddr *) &addr, sizeof (addr)))!=0) {
				lprintf("%04d !SEND ERROR %d (%d) binding socket", sock, i, ERROR_VALUE);
				continue;
			}

			strcpy(err,"UNKNOWN ERROR");
			success=FALSE;
			for(j=0;j<2 && !success;j++) {
				if(j) {
					if(startup->options&MAIL_OPT_RELAY_TX || !mx2[0])
						break;
					server=mx2;	/* Give second mx record a try */
				}
				
				lprintf("%04d SEND resolving SMTP host name: %s", sock, server);
				ip_addr=resolve_ip(server);
				if(!ip_addr)  {
					sprintf(err,"Failed to resolve SMTP host name: %s",server);
					continue;
				}

				memset(&server_addr,0,sizeof(server_addr));
				server_addr.sin_addr.s_addr = ip_addr;
				server_addr.sin_family = AF_INET;
				if(startup->options&MAIL_OPT_RELAY_TX)
					server_addr.sin_port = htons(startup->relay_port);
				else
					server_addr.sin_port = htons(IPPORT_SMTP);
				
				lprintf("%04d SEND connecting to port %u on %s [%s]"
					,sock
					,ntohs(server_addr.sin_port)
					,server,inet_ntoa(server_addr.sin_addr));
				if((i=connect(sock, (struct sockaddr *)&server_addr, sizeof(server_addr)))!=0) {
					lprintf("%04d !SEND ERROR %d (%d) connecting to SMTP server: %s"
						,sock
						,i,ERROR_VALUE, server);
					sprintf(err,"Error %d connecting to SMTP server: %s"
						,(int)ERROR_VALUE,server);
					continue;
				}
				success=TRUE;
			}
			if(!success) {	/* Failed to send, so bounce */
				bounce(&smb,&msg,err,FALSE);	
				continue;
			}

			lprintf("%04d SEND connected to %s",sock,server);

			/* HELO */
			if(!sockgetrsp(sock,"220",buf,sizeof(buf))) {
				sprintf(err,"%s replied with '%s' instead of 220",server,buf);
				bounce(&smb,&msg,err,buf[0]=='5');
				continue;
			}
			sockprintf(sock,"HELO %s",scfg.sys_inetaddr);
			if(!sockgetrsp(sock,"250", buf, sizeof(buf))) {
				sprintf(err,"%s replied with '%s' instead of 250",server,buf);
				bounce(&smb,&msg,err,buf[0]=='5');
				continue;
			}
			/* MAIL */
			if(msg.from_net.type==NET_INTERNET)
				strcpy(fromaddr,msg.from_net.addr);
			else 
				usermailaddr(fromaddr,msg.from);
			if(fromaddr[0]=='<')
				sockprintf(sock,"MAIL FROM: %s",fromaddr);
			else
				sockprintf(sock,"MAIL FROM: <%s>",fromaddr);
			if(!sockgetrsp(sock,"250", buf, sizeof(buf))) {
				sprintf(err,"%s replied with '%s' instead of 250",server,buf);
				bounce(&smb,&msg,err,buf[0]=='5');
				continue;
			}
			/* RCPT */
			if(*((char*)msg.to_net.addr)=='<')
				sockprintf(sock,"RCPT TO: %s", (char*)msg.to_net.addr);
			else
				sockprintf(sock,"RCPT TO: <%s>", (char*)msg.to_net.addr);
			if(!sockgetrsp(sock,"25", buf, sizeof(buf))) {
				sprintf(err,"%s replied with '%s' instead of 25*",server,buf);
				bounce(&smb,&msg,err,buf[0]=='5');
				continue;
			}
			/* DATA */
			sockprintf(sock,"DATA");
			if(!sockgetrsp(sock,"354", buf, sizeof(buf))) {
				sprintf(err,"%s replied with '%s' instead of 354",server,buf);
				bounce(&smb,&msg,err,buf[0]=='5');
				continue;
			}
			lprintf("%04d SEND sending message text (%u bytes)"
				,sock, strlen(msgtxt));
			sockmsgtxt(sock,&msg,msgtxt,fromaddr,-1);
			if(!sockgetrsp(sock,"250", buf, sizeof(buf))) {
				sprintf(err,"%s replied with '%s' instead of 250",server,buf);
				bounce(&smb,&msg,err,buf[0]=='5');
				continue;
			}
			lprintf("%04d SEND message transfer complete", sock);

			msg.hdr.attr|=MSG_DELETE;
			msg.idx.attr=msg.hdr.attr;
			if((i=smb_lockmsghdr(&smb,&msg))!=0) 
				lprintf("%04d !SEND ERROR %d locking message header #%lu"
					,sock
					,i,msg.hdr.number);
			if((i=smb_putmsg(&smb,&msg))!=0)
				lprintf("%04d !SEND ERROR %d deleting message #%lu"
					,sock
					,i,msg.hdr.number);
			smb_unlockmsghdr(&smb,&msg);

			/* QUIT */
			sockprintf(sock,"QUIT");
			sockgetrsp(sock,"221", buf, sizeof(buf));
			mail_close_socket(sock);
			sock=INVALID_SOCKET;
		}				
		status(STATUS_WFC);
	}
	if(sock!=INVALID_SOCKET)
		mail_close_socket(sock);

	smb_freemsgtxt(msgtxt);
	smb_freemsgmem(&msg);
	smb_close(&smb);

	lprintf("0000 SendMail thread terminated");

	sendmail_running=FALSE;

	thread_down();
}

void DLLCALL mail_terminate(void)
{
	if(server_socket!=INVALID_SOCKET) {
    	lprintf("%04d MAIL Terminate: closing socket",server_socket);
		mail_close_socket(server_socket);
	    server_socket=INVALID_SOCKET;
    }
}

static void cleanup(int code)
{
	free_cfg(&scfg);

	if(server_socket!=INVALID_SOCKET) {
		mail_close_socket(server_socket);
		server_socket=INVALID_SOCKET;
	}

	if(pop3_socket!=INVALID_SOCKET) {
		mail_close_socket(pop3_socket);
		pop3_socket=INVALID_SOCKET;
	}

	update_clients();

#ifdef _WINSOCKAPI_	
	if(WSAInitialized && WSACleanup()!=0) 
		lprintf("0000 !WSACleanup ERROR %d",ERROR_VALUE);
#endif

    lprintf("#### Mail Server thread terminated");
	status("Down");
	if(startup!=NULL && startup->terminated!=NULL)
		startup->terminated(code);
	thread_down();
}

const char* DLLCALL mail_ver(void)
{
	static char ver[256];
	char compiler[32];

	COMPILER_DESC(compiler);

	sprintf(ver,"Synchronet Mail Server v%s%s  SMBLIB v%s  "
		"Compiled %s %s with %s"
		,MAIL_VERSION
#ifdef _DEBUG
		," Debug"
#else
		,""
#endif
		,smb_lib_ver()
		,__DATE__, __TIME__, compiler
		);

	return(ver);
}

void DLLCALL mail_server(void* arg)
{
	char			compiler[32];
	SOCKADDR_IN		server_addr;
	SOCKADDR_IN		client_addr;
	int				client_addr_len;
	SOCKET			client_socket;
	int				i;
	int				result;
	ulong			l;
	time_t			t;
	time_t			start;
	LINGER			linger;
	fd_set			socket_set;
	SOCKET			high_socket_set;
	pop3_t*			pop3;
	smtp_t*			smtp;
	struct timeval	tv;

	startup=(mail_startup_t*)arg;

    if(startup==NULL) {
    	sbbs_beep(100,500);
    	fprintf(stderr, "No startup structure passed!\n");
    	return;
    }

	if(startup->size!=sizeof(mail_startup_t)) {	/* verify size */
		sbbs_beep(100,500);
		sbbs_beep(300,500);
		sbbs_beep(100,500);
		fprintf(stderr, "Invalid startup structure!\n");
		return;
	}

	/* Setup intelligent defaults */
	if(startup->relay_port==0)				startup->relay_port=IPPORT_SMTP;
	if(startup->smtp_port==0)				startup->smtp_port=IPPORT_SMTP;
	if(startup->pop3_port==0)				startup->pop3_port=110;
	if(startup->rescan_frequency==0)		startup->rescan_frequency=3600;	/* 60 minutes */
	if(startup->max_delivery_attempts==0)	startup->max_delivery_attempts=50;
	if(startup->max_inactivity==0) 			startup->max_inactivity=120; /* seconds */

	thread_up();

	status("Initializing");

    memset(&scfg, 0, sizeof(scfg));

#ifdef __unix__		/* Ignore "Broken Pipe" signal */
	signal(SIGPIPE,SIG_IGN);
#endif

	lprintf("Synchronet Mail Server Version %s%s"
		,MAIL_VERSION
#ifdef _DEBUG
		," Debug"
#else
		,""
#endif
		);

	COMPILER_DESC(compiler);

	lprintf("Compiled %s %s with %s", __DATE__, __TIME__, compiler);

	lprintf("SMBLIB v%s (format %x.%02x)",smb_lib_ver(),smb_ver()>>8,smb_ver()&0xff);

	srand(time(NULL));

	if(!(startup->options&MAIL_OPT_LOCAL_TIMEZONE)) {
		if(PUTENV("TZ=UCT0"))
			lprintf("!putenv() FAILED");
		tzset();

		if((t=checktime())!=0) {   /* Check binary time */
			lprintf("!TIME PROBLEM (%ld)",t);
			cleanup(1);
			return;
		}
	}

	if(!winsock_startup()) {
		cleanup(1);
		return;
	}

	t=time(NULL);
	lprintf("Initializing on %.24s with options: %lx"
		,ctime(&t),startup->options);

	/* Initial configuration and load from CNF files */
    sprintf(scfg.ctrl_dir, "%.*s", (int)sizeof(scfg.ctrl_dir)-1
    	,startup->ctrl_dir);
    lprintf("Loading configuration files from %s", scfg.ctrl_dir);
	scfg.size=sizeof(scfg);
	if(!load_cfg(&scfg, NULL, TRUE)) {
		lprintf("!Failed to load configuration files");
		cleanup(1);
		return;
	}

	if(startup->max_clients==0) {
		startup->max_clients=scfg.sys_nodes;
		if(startup->max_clients<10)
			startup->max_clients=10;
	}

	lprintf("Maximum clients: %u",startup->max_clients);

	lprintf("Maximum inactivity: %u seconds",startup->max_inactivity);

	active_clients=0;
	update_clients();

    /* open a socket and wait for a client */

    server_socket = mail_open_socket(SOCK_STREAM);

	if (server_socket == INVALID_SOCKET) {
		lprintf("!ERROR %d opening socket", ERROR_VALUE);
		cleanup(1);
		return;
	}

    lprintf("%04d SMTP socket opened",server_socket);

#if 1
	linger.l_onoff=TRUE;
    linger.l_linger=5;	/* seconds */

	result = setsockopt (server_socket, SOL_SOCKET, SO_LINGER
    	,(char *)&linger, sizeof(linger));

	if (result != 0) {
		lprintf("%04d !ERROR %d (%d) setting socket options"
			,server_socket, result, ERROR_VALUE);
		cleanup(1);
		return;
	}
#endif

	/*****************************/
	/* Listen for incoming calls */
	/*****************************/
    memset(&server_addr, 0, sizeof(server_addr));

	server_addr.sin_addr.s_addr = htonl(startup->interface_addr);
    server_addr.sin_family = AF_INET;
    server_addr.sin_port   = htons(startup->smtp_port);

    result = bind(server_socket, (struct sockaddr *) &server_addr
    	,sizeof (server_addr));

	if (result != 0) {
		lprintf("%04d !ERROR %d (%d) binding SMTP socket to port %u"
			,server_socket, result, ERROR_VALUE, startup->smtp_port);
		lprintf("!Another service may be using this port");
		cleanup(1);
		return;
	}

    lprintf("%04d SMTP socket bound to port %u"
		,server_socket, startup->smtp_port);

    result = listen (server_socket, 1);

	if (result != 0) {
		lprintf("%04d !ERROR %d (%d) listening on socket"
			,server_socket, result, ERROR_VALUE);
		cleanup(1);
		return;
	}

	if(startup->options&MAIL_OPT_ALLOW_POP3) {

		/* open a socket and wait for a client */

		pop3_socket = mail_open_socket(SOCK_STREAM);

		if (pop3_socket == INVALID_SOCKET) {
			lprintf("!ERROR %d opening POP3 socket", ERROR_VALUE);
			cleanup(1);
			return;
		}

		lprintf("%04d POP3 socket opened",pop3_socket);

		/*****************************/
		/* Listen for incoming calls */
		/*****************************/
		memset(&server_addr, 0, sizeof(server_addr));

		server_addr.sin_addr.s_addr = htonl(startup->interface_addr);
		server_addr.sin_family = AF_INET;
		server_addr.sin_port   = htons(startup->pop3_port);

		result = bind(pop3_socket, (struct sockaddr *) &server_addr
    		,sizeof (server_addr));

		if (result != 0) {
			lprintf("%04d !ERROR %d (%d) binding POP3 socket to port %u"
				,pop3_socket, result, ERROR_VALUE, startup->pop3_port);
			lprintf("!Another service may be using this port");
			cleanup(1);
			return;
		}

	    lprintf("%04d POP3 socket bound to port %u"
			,pop3_socket, startup->pop3_port);

		result = listen (pop3_socket, 1);

		if (result != 0) {
			lprintf("%04d !ERROR %d (%d) listening on POP3 socket"
				,pop3_socket, result, ERROR_VALUE);
			cleanup(1);
			return;
		}
	}

	/* signal caller that we've started up successfully */
    if(startup->started!=NULL)
    	startup->started();

	if(!(startup->options&MAIL_OPT_NO_SENDMAIL))
		_beginthread (sendmail_thread, 0, NULL);

	lprintf("%04d Mail Server thread started",server_socket);
	status(STATUS_WFC);

	while (server_socket!=INVALID_SOCKET) {

		/* now wait for connection */

		FD_ZERO(&socket_set);
		FD_SET(server_socket,&socket_set);
		high_socket_set=server_socket+1;
		if(startup->options&MAIL_OPT_ALLOW_POP3) {
			FD_SET(pop3_socket,&socket_set);
			if(pop3_socket+1>high_socket_set)
				high_socket_set=pop3_socket+1;
		}

		tv.tv_sec=2;
		tv.tv_usec=0;

		if((i=select(high_socket_set,&socket_set,NULL,NULL,&tv))<1) {
			if(i==0) {
				mswait(1);
				continue;
			}
			if(ERROR_VALUE==EINTR)
				lprintf("0000 Mail Server listening interrupted");
			else if(ERROR_VALUE == ENOTSOCK)
            	lprintf("0000 Mail Server sockets closed");
			else
				lprintf("0000 !ERROR %d selecting sockets",ERROR_VALUE);
			break;
		}


		if(FD_ISSET(server_socket,&socket_set)) {

			client_addr_len = sizeof (client_addr);
			client_socket = accept(server_socket, (struct sockaddr *)&client_addr
        		,&client_addr_len);

			if (client_socket == INVALID_SOCKET)
			{
				if(ERROR_VALUE == ENOTSOCK)
            		lprintf("%04d SMTP socket closed while listening",server_socket);
				else
					lprintf("%04d !ERROR %d accept failed", server_socket, ERROR_VALUE);
				break;
			}
			if(startup->socket_open!=NULL)
				startup->socket_open(TRUE);
			sockets++;

			if(active_clients>=startup->max_clients) {
				lprintf("%04d !MAXMIMUM CLIENTS (%u) reached, access denied"
					,client_socket, startup->max_clients);
				sockprintf(client_socket,"421 Maximum active clients reached, please try again later.");
				mswait(3000);
				mail_close_socket(client_socket);
				continue;
			}

			l=1;

			if((i=ioctlsocket(client_socket, FIONBIO, &l))!=0) {
				lprintf("%04d !ERROR %d (%d) disabling blocking on socket"
					,client_socket, i, ERROR_VALUE);
				mail_close_socket(client_socket);
				continue;
			}

			if((smtp=malloc(sizeof(smtp_t)))==NULL) {
				lprintf("%04d !ERROR allocating %u bytes of memory for smtp_t"
					,client_socket, sizeof(smtp_t));
				mail_close_socket(client_socket);
				continue;
			}

			smtp->socket=client_socket;
			smtp->client_addr=client_addr;
			_beginthread (smtp_thread, 0, smtp);
		}

		if(FD_ISSET(pop3_socket,&socket_set)) {

			client_addr_len = sizeof (client_addr);
			client_socket = accept(pop3_socket, (struct sockaddr *)&client_addr
        		,&client_addr_len);

			if (client_socket == INVALID_SOCKET)
			{
				if(ERROR_VALUE == ENOTSOCK)
            		lprintf("%04d POP3 socket closed while listening",pop3_socket);
				else
					lprintf("%04d !ERROR %d accept failed", pop3_socket, ERROR_VALUE);
				break;
			}
			if(startup->socket_open!=NULL)
				startup->socket_open(TRUE);
			sockets++;

			if(active_clients>=startup->max_clients) {
				lprintf("%04d !MAXMIMUM CLIENTS (%u) reached, access denied"
					,client_socket, startup->max_clients);
				sockprintf(client_socket,"-ERR Maximum active clients reached, please try again later.");
				mswait(3000);
				mail_close_socket(client_socket);
				continue;
			}


			l=1;

			if((i=ioctlsocket(client_socket, FIONBIO, &l))!=0) {
				lprintf("%04d !ERROR %d (%d) disabling blocking on socket"
					,client_socket, i, ERROR_VALUE);
				sockprintf(client_socket,"-ERR System error, please try again later.");
				mswait(3000);
				mail_close_socket(client_socket);
				continue;
			}

			if((pop3=malloc(sizeof(pop3_t)))==NULL) {
				lprintf("%04d !ERROR allocating %u bytes of memory for pop3_t"
					,client_socket,sizeof(pop3_t));
				sockprintf(client_socket,"-ERR System error, please try again later.");
				mswait(3000);
				mail_close_socket(client_socket);
				continue;
			}

			pop3->socket=client_socket;
			pop3->client_addr=client_addr;

			_beginthread (pop3_thread, 0, pop3);
		}
	}

	if(active_clients) {
		lprintf("0000 Waiting for %d active clients to disconnect...", active_clients);
		start=time(NULL);
		while(active_clients) {
			if(time(NULL)-start>TIMEOUT_THREAD_WAIT) {
				lprintf("!TIMEOUT waiting for %u active clients ",active_clients);
				break;
			}
			mswait(100);
		}
	}

	if(sendmail_running) {
		lprintf("0000 Waiting for SendMail thread to terminate...");
		start=time(NULL);
		while(sendmail_running) {
			if(time(NULL)-start>TIMEOUT_THREAD_WAIT) {
				lprintf("!TIMEOUT waiting for sendmail thread to "
            		"terminate");
				break;
			}
			mswait(100);
		}
	}

	cleanup(0);
}