deb-mbse/mbfido/postecho.c

/*****************************************************************************
 *
 * File ..................: mbfido/postecho.c
 * Purpose ...............: Post echomail message.
 * Last modification date : 25-Aug-2001
 *
 *****************************************************************************
 * Copyright (C) 1997-2001
 *   
 * Michiel Broek		FIDO:		2:280/2802
 * Beekmansbos 10
 * 1971 BV IJmuiden
 * the Netherlands
 *
 * This file is part of MBSE BBS.
 *
 * This BBS 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, or (at your option) any
 * later version.
 *
 * MBSE BBS 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 MBSE BBS; see the file COPYING.  If not, write to the Free
 * Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *****************************************************************************/

#include "../lib/libs.h"
#include "../lib/structs.h"
#include "../lib/records.h"
#include "../lib/common.h"
#include "../lib/clcomm.h"
#include "../lib/msg.h"
#include "../lib/msgtext.h"
#include "../lib/dbcfg.h"
#include "../lib/dbnode.h"
#include "../lib/dbmsgs.h"
#include "../lib/dbdupe.h"
#include "../lib/dbuser.h"
#include "../lib/dbftn.h"
#include "ftn2rfc.h"
#include "postecho.h"
#include "storeecho.h"
#include "addpkt.h"
#include "rollover.h"



/*
 * External declarations
 */
extern	int	do_quiet;		/* No tty output	*/
extern	int	do_unsec;		/* Toss unsecure	*/
extern	int	check_dupe;		/* Check dupes		*/
extern	time_t	t_start;		/* Reference time	*/
extern	int	most_debug;		/* Heavy debugging	*/
extern	int	echo_in;		/* Echomail processed	*/
extern	int	echo_out;		/* Echomail forwarded	*/
extern	int	echo_bad;		/* Bad echomail		*/


#define	MAXPATH	73
#define	MAXSEEN	70


void tidy_qualify(qualify **);
void fill_qualify(qualify **, fidoaddr, int, int);
void dlog_qualify(qualify **, char *);
int EchoOut(fidoaddr, char *, char *, char *, FILE *, int, int, time_t);




/*
 *  Add echomail mesage to the queue.
 */
int EchoOut(fidoaddr aka, char *toname, char *fromname, char *subj, FILE *fp, int flags, int cost, time_t date)
{
	char	*buf;
	FILE	*qp;
	faddr	*From, *To;
	int	rc;

	if ((qp = OpenPkt(msgs.Aka, aka, (char *)"qqq")) == NULL) {
		WriteError("EchoOut(): OpenPkt failed");
		return 1;
	}

	From = fido2faddr(msgs.Aka);
	To = fido2faddr(aka);
	rc = AddMsgHdr(qp, From, To, flags, cost, date, toname, fromname, subj);
	tidy_faddr(To);
	tidy_faddr(From);
	if (rc) {
		WriteError("EchoOut(): AddMsgHdr failed");
		return 1;
	}

	rewind(fp);
	buf = calloc(2048, sizeof(char));

	while ((fgets(buf, 2048, fp)) != NULL) {
		Striplf(buf);
		fprintf(qp, "%s\r", buf);
	}

	free(buf);
	putc(0, qp);
	fsync(fileno(qp));
	fclose(qp);
	return 0;
}



void tidy_qualify(qualify **qal)
{
	qualify	*tmp, *old;

	for (tmp = *qal; tmp; tmp = old) {
		old = tmp->next;
		free(tmp);
	}
	*qal = NULL;
}



void fill_qualify(qualify **qal, fidoaddr aka, int orig, int insb)
{
	qualify		*tmp;

	tmp = (qualify *)malloc(sizeof(qualify));
	tmp->next     = *qal;
	tmp->aka      = aka;
	tmp->inseenby = insb;
	tmp->send     = ((!insb) && (!orig));
	tmp->orig     = orig;
	*qal = tmp;
}



void dlog_qualify(qualify **qal, char *msg)
{
	qualify	*tmpl;

	for (tmpl = *qal; tmpl; tmpl = tmpl->next) {
		Syslog('m', "%s InSB=%s Snd=%s Org=%s", 
			aka2str(tmpl->aka), tmpl->inseenby ? "True":"False",
			tmpl->send ? "True":"False",
			tmpl->orig ? "True":"False");
	}
}



/*
 * Post echomail message, forward if needed.
 * pkt_from, from, to, subj, orig, mdate, flags, cost, file
 * The msgs record must be in memory.
 *
 *  1 - Cannot open message base.
 *  4 - Rejected echomail message.
 *
 * For echomail, the crc32 is calculated over the ^AREA kludge, subject, 
 * message date, origin line, message id.
 */
int postecho(faddr *p_from, faddr *f, faddr *t, char *orig, char *subj,
		time_t mdate, int flags, int cost, FILE *fp, int tonews)
{
	char		*buf, *msgid = NULL, *reply = NULL, *p, *q, sbe[16];
	int		First = TRUE, rc = 0, i, kludges = TRUE;
	int		dupe = FALSE, bad = TRUE, seenlen, oldnet;
	faddr		*Faddr;
	unsigned long	crc;
	sysconnect	Link;
	fa_list		*sbl = NULL, *ptl = NULL, *tmpl;
	qualify		*qal = NULL, *tmpq;
	FILE		*nfp, *qp;

	Syslog('M', "Entering postecho, area %s %s", msgs.Tag, msgs.Name);
	Syslog('M', "p_from: %s", ascfnode(p_from, 0xff));
	Syslog('M', "from  : %s", ascfnode(f, 0xff));
	Syslog('M', "to    : %s", ascfnode(t, 0xff));
	Syslog('M', "subj  : %s", printable(subj, 0));
	Syslog('M', "origin: %s", orig);
	Syslog('M', "date  : %s", rfcdate(mdate));
	Syslog('M', "flags : %08x", flags);
	Syslog('M', "cost  : %d", cost);
	Syslog('M', "tonews: %s", tonews ? "True":"False");

	memset(&Link, 0, sizeof(Link));
	crc = 0xffffffff;
	echo_in++;

	/*
	 *  p_from is set for tossed echomail, it is NULL for local posted echomail and gated news.
	 */
	if (p_from) {
		while (GetMsgSystem(&Link, First)) {
			First = FALSE;
			if ((p_from->zone == Link.aka.zone) && (p_from->net  == Link.aka.net) && (p_from->node == Link.aka.node)) {
				bad = FALSE;
				break;
			}
		}
		if (bad && (msgs.UnSecure || do_unsec)) {
			bad = FALSE;
			memset(&Link, 0, sizeof(Link));
		}
		if (bad) {
			Syslog('+', "Node %s not connected to area %s", ascfnode(p_from, 0x1f), msgs.Tag);
			echo_bad++;
			return 4;
		}
		if (Link.cutoff && !bad) {
			Syslog('+', "Echomail from %s in %s refused, cutoff", ascfnode(p_from, 0x1f), msgs.Tag);
			bad = TRUE;
			echo_bad++;
			return 4;
		}
		if (!Link.receivefrom && !bad) {
			Syslog('+', "Echomail from %s in %s refused, read only", ascfnode(p_from, 0x1f), msgs.Tag);
			bad = TRUE;
			echo_bad++;
			return 4;
		}
	} else {
		/*
		 *  Fake the zone entry to be our own zone, this prevents
		 *  zonegate behaviour. It's also not a bad message yet.
		 */
		Link.aka.zone = msgs.Aka.zone;
		bad = FALSE;
	}

	if (CFG.toss_old && ((t_start - mdate) / 86400) > CFG.toss_old) {
		Syslog('+', "Rejecting msg: too old, %s", rfcdate(mdate));
		bad = TRUE;
		echo_bad++;
		return 4;
	}

	/*
	 * Read the message for kludges we need.
	 */
	buf = calloc(2048, sizeof(char));
	First = TRUE;
	rewind(fp);
	while ((fgets(buf, 2048, fp)) != NULL) {

		Striplf(buf);
		Syslogp('M', printable(buf, 0));

		if (First && (!strncmp(buf, "AREA:", 5))) {
			crc = upd_crc32(buf, crc, strlen(buf));
			First = FALSE;
		}
		if (!strncmp(buf, "\001MSGID: ", 8))
			msgid = xstrcpy(buf + 8);
		if (!strncmp(buf, "\001REPLY: ", 8))
			reply = xstrcpy(buf + 8);
		if (!strncmp(buf, "SEEN-BY:", 8)) {
			if (Link.aka.zone == msgs.Aka.zone) {
				p = xstrcpy(buf + 9);
				fill_list(&sbl, p, NULL);
				free(p);
			} else
				Syslog('m', "Strip zone SB lines");
		}
		if (!strncmp(buf, "\001PATH:", 6)) {
			p = xstrcpy(buf + 7);
			fill_path(&ptl, p);
			free(p);
		}
	} /* end of checking kludges */


	/*
	 * Further dupe checking.
	 */
	crc = upd_crc32(subj, crc, strlen(subj));
	if (orig == NULL)
		Syslog('!', "No origin line found");
	else
		crc = upd_crc32(orig, crc, strlen(orig));
	crc = upd_crc32((char *)&mdate, crc, sizeof(mdate));
	if (msgid != NULL) {
		crc = upd_crc32(msgid, crc, strlen(msgid));
	} else {
		if (check_dupe) {
			/*
			 *  If a MSGID is missing it is possible that dupes from some offline
			 *  readers slip through because these readers use the same date for
			 *  each message. In this case the message text is included in the
			 *  dupecheck. Redy Rodriguez.
			 */
			rewind(fp);
			while ((fgets(buf, 2048, fp)) != NULL) {
				Striplf(buf);
				if (strncmp(buf, "---", 3) == 0)
					break;
				if ((strncmp(buf, "\001", 1) != 0 ) && (strncmp(buf,"AREA:",5) != 0 )) 
					crc = upd_crc32(buf, crc , strlen(buf));        
			}     
		}   
	}
	if (check_dupe)
		dupe = CheckDupe(crc, D_ECHOMAIL, CFG.toss_dupes);
	else
		dupe = FALSE;


	if (!dupe && !msgs.UnSecure && !do_unsec) {
		/*
		 * Check if the message is for us. Don't check point address,
		 * echomail messages don't have point destination set.
		 */
		if ((msgs.Aka.zone != t->zone) || (msgs.Aka.net != t->net) || (msgs.Aka.node != t->node)) {
			bad = TRUE;
			/*
			 * If we are a hub or host and have all our echomail
			 * connected to the hub/host aka, echomail from points
			 * under a nodenumber aka isn't accepted. The match
			 * must be further tested.
			 */
			if ((msgs.Aka.zone == t->zone) && (msgs.Aka.net == t->net)) {
				for (i = 0; i < 40; i++) {
					if ((CFG.akavalid[i]) &&
					    (CFG.aka[i].zone == t->zone) &&
					    (CFG.aka[i].net  == t->net) &&
					    (CFG.aka[i].node == t->node))
						bad = FALSE; /* Undo the result */
				}
			}
		}
		if (bad) {
			echo_bad++;
			WriteError("Msg in %s not for us (%s) but for %s", msgs.Tag, aka2str(msgs.Aka), ascfnode(t,0x1f));
			free(buf);
			if (msgid)
				free(msgid);
			if (reply)
				free(reply);
			return 4;
		}
	}


	/*
	 *  The echomail message is accepted for post/forward/gate
	 */
	if (!dupe) {

		if (msgs.Aka.zone != Link.aka.zone) {
			/*
			 * If it is a zonegated echomailmessage the SEEN-BY lines
			 * are stripped off including that of the other zone's
			 * gate. Add the gate's aka to the SEEN-BY
			 */
			Syslog('m', "Gated echomail, clean SB");
			tidy_falist(&sbl);
			sprintf(sbe, "%u/%u", Link.aka.net, Link.aka.node);
			Syslog('m', "Add gate SB %s", sbe);
			fill_list(&sbl, sbe, NULL);
		}

		/*
		 * Add more aka's to SEENBY if in the same zone as our system.
		 * When ready filter dupe's, there is at least one.
		 */
		for (i = 0; i < 40; i++) {
			if (CFG.akavalid[i] && (msgs.Aka.zone == CFG.aka[i].zone) &&
			    !((msgs.Aka.net == CFG.aka[i].net) && (msgs.Aka.node == CFG.aka[i].node))) {
				sprintf(sbe, "%u/%u", CFG.aka[i].net, CFG.aka[i].node);
				fill_list(&sbl, sbe, NULL);
			}
		}
		uniq_list(&sbl);
	}


	/*
	 * Add our system to the path for later export.
	 */
	sprintf(sbe, "%u/%u", msgs.Aka.net, msgs.Aka.node);
	fill_path(&ptl, sbe);
	uniq_list(&ptl);	/* remove possible duplicate own aka */

	/*
	 * Build a list of qualified systems to receive this message.
	 * Complete the SEEN-BY lines.
	 */
	First = TRUE;
	while (GetMsgSystem(&Link, First)) {
		First = FALSE;
		if ((Link.aka.zone) && (Link.sendto) && (!Link.pause) && (!Link.cutoff)) {
			Faddr = fido2faddr(Link.aka);
			if (p_from == NULL) {
				fill_qualify(&qal, Link.aka, FALSE, in_list(Faddr, &sbl, FALSE));
			} else {
				fill_qualify(&qal, Link.aka, ((p_from->zone  == Link.aka.zone) && 
				      (p_from->net   == Link.aka.net) && (p_from->node  == Link.aka.node) && 
				      (p_from->point == Link.aka.point)), in_list(Faddr, &sbl, FALSE));
			}
			tidy_faddr(Faddr);
		}
	}


	/*
	 *  Add SEEN-BY for nodes qualified to receive this message.
	 *  When ready, filter the dupes and sort the SEEN-BY entries.
	 */
	for (tmpq = qal; tmpq; tmpq = tmpq->next) {
		if (tmpq->send) {
			sprintf(sbe, "%u/%u", tmpq->aka.net, tmpq->aka.node);
			fill_list(&sbl, sbe, NULL);
		}
	}
	uniq_list(&sbl);
	sort_list(&sbl);


	/*
	 *  Create a new tmpfile with a copy of the message
	 *  without original PATH and SEENBY lines, add the
	 *  new PATH and SEENBY lines.
	 */
	rewind(fp);
	if ((nfp = tmpfile()) == NULL)
		WriteError("$Unable to open tmpfile");
	while ((fgets(buf, 2048, fp)) != NULL) {
		Striplf(buf);
		fprintf(nfp, "%s", buf);
		/*
		 * Don't write SEEN-BY and PATH lines
		 */
		if (strncmp(buf, " * Origin:", 10) == 0)
			break;
		fprintf(nfp, "\n");
	}


	/*
	 * Now add new SEEN-BY and PATH lines
	 */
	seenlen = MAXSEEN + 1;
	/*
	 * Ensure that it will not match for the first entry.
	 */
	oldnet = sbl->addr->net - 1;
	for (tmpl = sbl; tmpl; tmpl = tmpl->next) {
		if (tmpl->addr->net == oldnet)
			sprintf(sbe, " %u", tmpl->addr->node);
		else
			sprintf(sbe, " %u/%u", tmpl->addr->net, tmpl->addr->node);
		oldnet = tmpl->addr->net;
		seenlen += strlen(sbe);
		if (seenlen > MAXSEEN) {
			seenlen = 0;
			fprintf(nfp, "\nSEEN-BY:");
			sprintf(sbe, " %u/%u", tmpl->addr->net, tmpl->addr->node);
			seenlen = strlen(sbe);
		}
		fprintf(nfp, "%s", sbe);
	}

	seenlen = MAXPATH + 1;
	/* 
	 * Ensure it will not match for the first entry
	 */
	oldnet = ptl->addr->net - 1;
	for (tmpl = ptl; tmpl; tmpl = tmpl->next) {
		if (tmpl->addr->net == oldnet)
			sprintf(sbe, " %u", tmpl->addr->node);
		else
			sprintf(sbe, " %u/%u", tmpl->addr->net, tmpl->addr->node);
		oldnet = tmpl->addr->net;
		seenlen += strlen(sbe);
		if (seenlen > MAXPATH) {
			seenlen = 0;
			fprintf(nfp, "\n\001PATH:");
			sprintf(sbe, " %u/%u", tmpl->addr->net, tmpl->addr->node);
			seenlen = strlen(sbe);
		}
		fprintf(nfp, "%s", sbe);
	}
	fprintf(nfp, "\n");
	fflush(nfp);
	rewind(nfp);


	/*
	 * Import this echomail, even if it's bad or a dupe.
	 */
	if (storeecho(f, t, mdate, flags, subj, msgid, reply, bad, dupe, nfp) || bad || dupe) {
		/*
		 *  Store failed or it was bad or a dupe.
		 */
		WriteError("Store echomail in JAM base failed");
		tidy_falist(&sbl);
		tidy_falist(&ptl);
		tidy_qualify(&qal);
		free(buf);
		if (msgid)
			free(msgid);
		if (reply)
			free(reply);
		return 0;
	}

	/*
	 * Forward to other links
	 */
	for (tmpq = qal; tmpq; tmpq = tmpq->next) {
		if (tmpq->send) {
			if (SearchNode(tmpq->aka)) {
				StatAdd(&nodes.MailSent, 1L);
				UpdateNode();
				SearchNode(tmpq->aka);
			}
			echo_out++;
			if (EchoOut(tmpq->aka, t->name, f->name, subj, nfp, flags, cost, mdate))
				WriteError("Forward echomail to %s failed", aka2str(tmpq->aka));
		}
	}

	/*
	 *  Gate to newsserver
	 */
	if (strlen(msgs.Newsgroup) && tonews) {
		rewind(nfp);
		qp = tmpfile();
	        while ((fgets(buf, 2048, nfp)) != NULL) {
			Striplf(buf);
			if (kludges && (buf[0] != '\001') && strncmp(buf, "AREA:", 5)) {
				kludges = FALSE;
				q = xstrcpy(Msg.From);
				for (i = 0; i < strlen(q); i++)
					if (q[i] == ' ')
						q[i] = '_';
				fprintf(qp, "From: %s@%s\n", q, ascinode(f, 0x1f));
				fprintf(qp, "Subject: %s\n", Msg.Subject);
				fprintf(qp, "To: %s\n", Msg.To);

		//	FIXME: hier nog X-...-To: ??

				fprintf(qp, "\n");
			}
			fprintf(qp, "%s\n", buf);
		}
		rewind(qp);
		most_debug = TRUE;
		ftn2rfc(f, t, subj, orig, mdate, flags, qp);
		most_debug = FALSE;
		fclose(qp);
	}
	fclose(nfp);

	/*
	 * Free memory used by SEEN-BY, ^APATH and Qualified lines.
	 */
	tidy_falist(&sbl);
	tidy_falist(&ptl);
	tidy_qualify(&qal);

	if (rc < 0) 
		rc =-rc;
	free(buf);
	if (msgid)
		free(msgid);
	if (reply)
		free(reply);
	return rc;
}