mailsrvr.c

	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(LOG_ERR,"0000 !WSACleanup ERROR %d",ERROR_VALUE);
#endif

	thread_down();
	status("Down");
	if(terminate_server || code)
		lprintf(LOG_INFO,"#### Mail Server thread terminated (%u threads remain, %lu clients served)"
			,thread_count, served);
	if(startup!=NULL && startup->terminated!=NULL)
		startup->terminated(startup->cbdata,code);
}

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

	DESCRIBE_COMPILER(compiler);

	sscanf("$Revision$", "%*s %s", revision);

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

	return(ver);
}

void DLLCALL mail_server(void* arg)
{
	char*			p;
	char			path[MAX_PATH+1];
	char			str[256];
	char			error[256];
	char			compiler[32];
	SOCKADDR_IN		server_addr;
	SOCKADDR_IN		client_addr;
	socklen_t		client_addr_len;
	SOCKET			client_socket;
	int				i;
	int				result;
	ulong			l;
	time_t			t;
	time_t			start;
	time_t			initialized=0;
	fd_set			socket_set;
	SOCKET			high_socket_set;
	pop3_t*			pop3;
	smtp_t*			smtp;
	struct timeval	tv;
	FILE*			fp;
	str_list_t		sec_list;

	mail_ver();

	startup=(mail_startup_t*)arg;

#ifdef _THREAD_SUID_BROKEN
	startup->seteuid(TRUE);
#endif

    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=IPPORT_POP3;
	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 */
	if(startup->max_recipients==0) 			startup->max_recipients=100;
	if(startup->sem_chk_freq==0)			startup->sem_chk_freq=2;

#ifdef JAVASCRIPT
	if(startup->js.max_bytes==0)			startup->js.max_bytes=JAVASCRIPT_MAX_BYTES;
	if(startup->js.cx_stack==0)				startup->js.cx_stack=JAVASCRIPT_CONTEXT_STACK;
#endif

	uptime=0;
	served=0;
	startup->recycle_now=FALSE;
	startup->shutdown_now=FALSE;
	terminate_server=FALSE;

	do {

		thread_up(FALSE /* setuid */);

		status("Initializing");

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

		lprintf(LOG_INFO,"Synchronet Mail Server Revision %s%s"
			,revision
#ifdef _DEBUG
			," Debug"
#else
			,""
#endif
			);

		DESCRIBE_COMPILER(compiler);

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

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

		sbbs_srand();

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

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

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

		if(startup->temp_dir[0])
			SAFECOPY(scfg.temp_dir,startup->temp_dir);
		else
			SAFECOPY(scfg.temp_dir,"../temp");
	   	prep_dir(scfg.ctrl_dir, scfg.temp_dir, sizeof(scfg.temp_dir));
		MKDIR(scfg.temp_dir);
		lprintf(LOG_DEBUG,"Temporary file directory: %s", scfg.temp_dir);
		if(!isdir(scfg.temp_dir)) {
			lprintf(LOG_ERR,"!Invalid temp directory: %s", scfg.temp_dir);
			cleanup(1);
			return;
		}

		/* Parse the mailproc[.host].ini */
		mailproc_list=NULL;
		mailproc_count=0;
		iniFileName(path,sizeof(path),scfg.ctrl_dir,"mailproc.ini");
		if((fp=iniOpenFile(path, /* create? */FALSE))!=NULL) {
			lprintf(LOG_DEBUG,"Reading %s",path);
			sec_list = iniReadSectionList(fp,/* prefix */NULL);
			if((mailproc_count=strListCount(sec_list))!=0
				&& (mailproc_list=malloc(mailproc_count*sizeof(struct mailproc)))!=NULL) {
				for(i=0;i<mailproc_count;i++) {
					memset(&mailproc_list[i],0,sizeof(struct mailproc));
					SAFECOPY(mailproc_list[i].cmdline,sec_list[i]);
					mailproc_list[i].to =
						iniReadStringList(fp,sec_list[i],"to",",",NULL);
					mailproc_list[i].passthru =
						iniReadBool(fp,sec_list[i],"passthru",TRUE);
					mailproc_list[i].native =
						iniReadBool(fp,sec_list[i],"native",FALSE);
				}
			}
			iniCloseFile(fp);
		}

		if(startup->host_name[0]==0)
			SAFECOPY(startup->host_name,scfg.sys_inetaddr);

		if(!(scfg.sys_misc&SM_LOCAL_TZ) && !(startup->options&MAIL_OPT_LOCAL_TIMEZONE)) {
			if(putenv("TZ=UTC0"))
				lprintf(LOG_ERR,"!putenv() FAILED");
			tzset();

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

		if(uptime==0)
			uptime=time(NULL);	/* this must be done *after* setting the timezone */

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

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

		lprintf(LOG_DEBUG,"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,"smtp");

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

		lprintf(LOG_DEBUG,"%04d SMTP socket opened",server_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->smtp_port);

		if(startup->seteuid!=NULL)
			startup->seteuid(FALSE);
		result = retry_bind(server_socket,(struct sockaddr *)&server_addr,sizeof(server_addr)
			,startup->bind_retry_count,startup->bind_retry_delay,"SMTP Server",lprintf);
		if(startup->seteuid!=NULL)
			startup->seteuid(TRUE);
		if(result != 0) {
			lprintf(LOG_ERR,"%04d %s",server_socket, BIND_FAILURE_HELP);
			cleanup(1);
			return;
		}

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

		result = listen (server_socket, 1);

		if(result != 0) {
			lprintf(LOG_ERR,"%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,"pop3");

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

			lprintf(LOG_DEBUG,"%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);

			if(startup->seteuid!=NULL)
				startup->seteuid(FALSE);
			result = retry_bind(pop3_socket,(struct sockaddr *)&server_addr,sizeof(server_addr)
				,startup->bind_retry_count,startup->bind_retry_delay,"POP3 Server",lprintf);
			if(startup->seteuid!=NULL)
				startup->seteuid(TRUE);
			if(result != 0) {
				lprintf(LOG_ERR,"%04d %s",pop3_socket,BIND_FAILURE_HELP);
				cleanup(1);
				return;
			}

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

			result = listen (pop3_socket, 1);

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

		sem_init(&sendmail_wakeup_sem,0,0);

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

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

		/* Setup recycle/shutdown semaphore file lists */
		shutdown_semfiles=semfile_list_init(scfg.ctrl_dir,"shutdown","mail");
		recycle_semfiles=semfile_list_init(scfg.ctrl_dir,"recycle","mail");
		SAFEPRINTF(path,"%smailsrvr.rec",scfg.ctrl_dir);	/* legacy */
		semfile_list_add(&recycle_semfiles,path);
		if(!initialized) {
			initialized=time(NULL);
			semfile_list_check(&initialized,recycle_semfiles);
			semfile_list_check(&initialized,shutdown_semfiles);
		}

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

		while(server_socket!=INVALID_SOCKET && !terminate_server) {

			if(active_clients==0) {
				if(!(startup->options&MAIL_OPT_NO_RECYCLE)) {
					if((p=semfile_list_check(&initialized,recycle_semfiles))!=NULL) {
						lprintf(LOG_INFO,"%04d Recycle semaphore file (%s) detected"
							,server_socket,p);
						break;
					}
#if 0	/* unused */
					if(startup->recycle_sem!=NULL && sem_trywait(&startup->recycle_sem)==0)
						startup->recycle_now=TRUE;
#endif
					if(startup->recycle_now==TRUE) {
						lprintf(LOG_NOTICE,"%04d Recycle semaphore signaled", server_socket);
						startup->recycle_now=FALSE;
						break;
					}
				}
				if(((p=semfile_list_check(&initialized,shutdown_semfiles))!=NULL
						&& lprintf(LOG_INFO,"%04d Shutdown semaphore file (%s) detected"
						,server_socket,p))
					|| (startup->shutdown_now==TRUE
						&& lprintf(LOG_INFO,"%04d Shutdown semaphore signaled",server_socket))) {
					startup->shutdown_now=FALSE;
					terminate_server=TRUE;
					break;
				}
			}

			/* 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 
				&& pop3_socket!=INVALID_SOCKET) {
				FD_SET(pop3_socket,&socket_set);
				if(pop3_socket+1>high_socket_set)
					high_socket_set=pop3_socket+1;
			}

			tv.tv_sec=startup->sem_chk_freq;
			tv.tv_usec=0;

			if((i=select(high_socket_set,&socket_set,NULL,NULL,&tv))<1) {
				if(i==0)
					continue;
				if(ERROR_VALUE==EINTR)
					lprintf(LOG_NOTICE,"%04d Mail Server listening interrupted",server_socket);
				else if(ERROR_VALUE == ENOTSOCK)
            		lprintf(LOG_NOTICE,"%04d Mail Server sockets closed",server_socket);
				else
					lprintf(LOG_WARNING,"%04d !ERROR %d selecting sockets",server_socket,ERROR_VALUE);
				continue;
			}

			if(server_socket!=INVALID_SOCKET && !terminate_server
				&& 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 0	/* is this necessary still? */
					if(ERROR_VALUE == ENOTSOCK || ERROR_VALUE == EINVAL) {
            			lprintf(LOG_NOTICE,"%04d SMTP socket closed while listening"
							,server_socket);
						break;
					}
#endif
					lprintf(LOG_WARNING,"%04d SMTP !ERROR %d accepting connection"
						,server_socket, ERROR_VALUE);
#ifdef _WIN32
					if(WSAGetLastError()==WSAENOBUFS)	/* recycle (re-init WinSock) on this error */
						break;
#endif
					continue;
				}
				if(startup->socket_open!=NULL)
					startup->socket_open(startup->cbdata,TRUE);
				sockets++;

				if(trashcan(&scfg,inet_ntoa(client_addr.sin_addr),"ip-silent")) {
					mail_close_socket(client_socket);
					continue;
				}

				if(active_clients>=startup->max_clients) {
					lprintf(LOG_WARNING,"%04d SMTP !MAXIMUM 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(LOG_ERR,"%04d SMTP !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(LOG_CRIT,"%04d SMTP !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);
				served++;
			}

			if(pop3_socket!=INVALID_SOCKET
				&& 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 0	/* is this necessary still? */
					if(ERROR_VALUE == ENOTSOCK || ERROR_VALUE == EINVAL) {
            			lprintf(LOG_NOTICE,"%04d POP3 socket closed while listening",pop3_socket);
						break;
					}
#endif
					lprintf(LOG_WARNING,"%04d POP3 !ERROR %d accepting connection"
						,pop3_socket, ERROR_VALUE);
#ifdef _WIN32
					if(WSAGetLastError()==WSAENOBUFS)	/* recycle (re-init WinSock) on this error */
						break;
#endif
					continue;
				}
				if(startup->socket_open!=NULL)
					startup->socket_open(startup->cbdata,TRUE);
				sockets++;

				if(trashcan(&scfg,inet_ntoa(client_addr.sin_addr),"ip-silent")) {
					mail_close_socket(client_socket);
					continue;
				}

				if(active_clients>=startup->max_clients) {
					lprintf(LOG_WARNING,"%04d POP3 !MAXIMUM 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(LOG_ERR,"%04d POP3 !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(LOG_CRIT,"%04d POP3 !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);
				served++;
			}
		}

		if(active_clients) {
			lprintf(LOG_DEBUG,"%04d Waiting for %d active clients to disconnect..."
				,server_socket, active_clients);
			start=time(NULL);
			while(active_clients) {
				if(time(NULL)-start>startup->max_inactivity) {
					lprintf(LOG_WARNING,"%04d !TIMEOUT waiting for %d active clients"
						,server_socket, active_clients);
					break;
				}
				mswait(100);
			}
		}

		if(sendmail_running) {
			terminate_sendmail=TRUE;
			sem_post(&sendmail_wakeup_sem);
			mswait(100);
		}
		if(sendmail_running) {
			lprintf(LOG_DEBUG,"%04d Waiting for SendMail thread to terminate..."
				,server_socket);
			start=time(NULL);
			while(sendmail_running) {
				if(time(NULL)-start>TIMEOUT_THREAD_WAIT) {
					lprintf(LOG_WARNING,"%04d !TIMEOUT waiting for sendmail thread to terminate"
						,server_socket);
					break;
				}
				mswait(500);
			}
		}
		if(!sendmail_running) {
			while(sem_destroy(&sendmail_wakeup_sem)==-1 && errno==EBUSY) {
				mswait(1);
				sem_post(&sendmail_wakeup_sem);
			}
		}

		cleanup(0);

		if(!terminate_server) {
			lprintf(LOG_INFO,"Recycling server...");
			mswait(2000);
			if(startup->recycle!=NULL)
				startup->recycle(startup->cbdata);
		}

	} while(!terminate_server);
}