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deb-mbse/mbfido/tracker.c
Michiel Broek 1c8719c1de Secured sprintf with snprintf
2005-08-28 14:10:06 +00:00

724 lines
19 KiB
C
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/*****************************************************************************
*
* $Id$
* Purpose ...............: Netmail tracker / router
*
*****************************************************************************
* Copyright (C) 1997-2005
*
* 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, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*****************************************************************************/
#include "../config.h"
#include "../lib/mbselib.h"
#include "../lib/users.h"
#include "../lib/nodelist.h"
#include "../lib/mbsedb.h"
#include "tracker.h"
extern char nodes_fil[81];
extern long nodes_pos;
/*
* Internal prototypes
*/
void ParseMask(char *, fidoaddr *);
char *get_routetype(int);
int GetTableRoute(char *, fidoaddr *);
int IsLocal(char *, fidoaddr *);
int GetRoute(char *, fidoaddr *);
int AreWeHost(faddr *);
int AreWeHub(faddr *);
/*
* Parse the mask from the routing table. If all 4d address parts
* are 0, then something is wrong. This cannot happen because the
* syntax is checked in mbsetup.
* Matched values return the actual value, the "All" masks return 65535.
*/
void ParseMask(char *s, fidoaddr *addr)
{
char *buf, *str, *p;
int good = TRUE;
memset(addr, 0, sizeof(fidoaddr));
if (s == NULL)
return;
str = buf = xstrcpy(s);
addr->zone = 65535;
if ((p = strchr(str, ':'))) {
*(p++) = '\0';
if (strspn(str, "0123456789") == strlen(str))
addr->zone = atoi(str);
else
if (strcmp(str,"All"))
good = FALSE;
str = p;
}
addr->net = 65535;
if ((p = strchr(str, '/'))) {
*(p++) = '\0';
if (strspn(str, "0123456789") == strlen(str))
addr->net = atoi(str);
else
if (strcmp(str, "All"))
good = FALSE;
str = p;
}
if ((p=strchr(str, '.'))) {
*(p++) = '\0';
if (strspn(str, "0123456789") == strlen(str))
addr->node = atoi(str);
else
if (strcmp(str, "All") == 0)
addr->node = 65535;
else
good = FALSE;
str = p;
} else {
if (strspn(str, "0123456789") == strlen(str))
addr->node = atoi(str);
else
if (strcmp(str, "All") == 0)
addr->node = 65535;
else
good = FALSE;
str = NULL;
}
if (str) {
if (strspn(str, "0123456789") == strlen(str))
addr->point = atoi(str);
else
if (strcmp(str, "All") == 0)
addr->point = 65535;
else
good = FALSE;
}
if (buf)
free(buf);
if (!good) {
addr->zone = 0;
addr->net = 0;
addr->node = 0;
addr->point = 0;
}
return;
}
char *get_routetype(int val)
{
switch (val) {
case R_NOROUTE: return (char *)"Default route";
case R_ROUTE: return (char *)"Route to";
case R_DIRECT: return (char *)"Direct";
case R_REDIRECT: return (char *)"New address";
case R_BOUNCE: return (char *)"Bounce";
case R_CC: return (char *)"CarbonCopy ";
case R_LOCAL: return (char *)"Local aka";
case R_UNLISTED: return (char *)"Unlisted";
default: return (char *)"Internal error";
}
}
int GetTableRoute(char *ftn, fidoaddr *res)
{
char *temp;
faddr *dest;
fidoaddr mask;
int match, last;
long ptr;
FILE *fil;
/*
* Check routing table
*/
temp = calloc(PATH_MAX, sizeof(char));
snprintf(temp, PATH_MAX, "%s/etc/route.data", getenv("MBSE_ROOT"));
if ((fil = fopen(temp, "r")) == NULL) {
free(temp);
return R_NOROUTE;
}
free(temp);
fread(&routehdr, sizeof(routehdr), 1, fil);
memset(res, 0, sizeof(fidoaddr));
dest = parsefnode(ftn);
if (SearchFidonet(dest->zone)) {
if (dest->domain)
free(dest->domain);
dest->domain = xstrcpy(fidonet.domain);
}
Syslog('r', "Get table route for: %s", ascfnode(dest, 0xff));
match = last = METRIC_MAX;
ptr = ftell(fil);
while (fread(&route, routehdr.recsize, 1, fil) == 1) {
if (route.Active) {
ParseMask(route.mask, &mask);
Syslog('r', "Table %s (%s) => %s", route.mask, get_routetype(route.routetype), aka2str(route.dest));
match = METRIC_MAX;
if (mask.zone) {
if ((mask.zone == 65535) || (mask.zone == dest->zone)) {
match = METRIC_ZONE;
if ((mask.net == 65535) || (mask.net == dest->net)) {
match = METRIC_NET;
if ((mask.node == 65535) || (mask.node == dest->node)) {
match = METRIC_NODE;
if ((mask.point == 65535) || (mask.point == dest->point))
match = METRIC_POINT;
}
}
}
if (match < last) {
Syslog('r', "Best util now");
last = match;
ptr = ftell(fil) - routehdr.recsize;
}
} else {
Syslog('!', "Warning, internal error in routing table");
}
}
}
tidy_faddr(dest);
if (last < METRIC_MAX) {
fseek(fil, ptr, SEEK_SET);
fread(&route, routehdr.recsize, 1, fil);
fclose(fil);
Syslog('r', "Route selected %s %s %s", route.mask, get_routetype(route.routetype), aka2str(route.dest));
memcpy(res, &route.dest, sizeof(fidoaddr));
return route.routetype;
}
fclose(fil);
return R_NOROUTE;
}
/*
* Check if destination is one of our local aka's
*/
int IsLocal(char *ftn, fidoaddr *res)
{
faddr *dest;
int i;
memset(res, 0, sizeof(fidoaddr));
dest = parsefnode(ftn);
if (SearchFidonet(dest->zone)) {
if (dest->domain)
free(dest->domain);
dest->domain = xstrcpy(fidonet.domain);
}
Syslog('r', "Check local aka for: %s", ascfnode(dest, 0xff));
/*
* Check if the destination is ourself.
*/
for (i = 0; i < 40; i++) {
if (CFG.akavalid[i] && (CFG.aka[i].zone == dest->zone) && (CFG.aka[i].net == dest->net) &&
(CFG.aka[i].node == dest->node) && (dest->point == CFG.aka[i].point)) {
Syslog('+', "R: %s => Loc %s", ascfnode(dest, 0x0f), aka2str(CFG.aka[i]));
memcpy(res, &CFG.aka[i], sizeof(fidoaddr));
tidy_faddr(dest);
return R_LOCAL;
}
}
tidy_faddr(dest);
return R_NOROUTE;
}
/*
* Netmail tracker. Return TRUE if we found a valid route.
* If we did find a route, it is returned in the route pointer.
* If not, return FALSE. The calling program must bounce the
* original message.
*/
int TrackMail(fidoaddr too, fidoaddr *routeto)
{
int rc, i;
char *tstr;
Syslog('r', "Tracking destination to %s", aka2str(too));
/*
* Check for local destination
*/
rc = IsLocal(aka2str(too) , routeto);
if (rc == R_LOCAL) {
// FIXME: When R_CC implemented check table for Cc:
return rc;
}
/*
* Check route table
*/
tstr = xstrcpy(aka2str(too));
rc = GetTableRoute(aka2str(too), routeto);
if (rc != R_NOROUTE) {
Syslog('+', "R: %s Routing table: %s => %s", tstr, get_routetype(rc), aka2str(*routeto));
free(tstr);
return rc;
}
free(tstr);
/*
* If no descision yet, get default routing
*/
rc = GetRoute(aka2str(too) , routeto);
if (rc == R_NOROUTE) {
WriteError("No route to %s, not parsed", aka2str(too));
return R_NOROUTE;
}
if (rc == R_UNLISTED) {
WriteError("No route to %s, unlisted node", aka2str(too));
return R_UNLISTED;
}
/*
* Now look again if from the routing result we find a
* direct link. If so, maybe adjust something.
*/
if (SearchNode(*routeto)) {
Syslog('r', "Node is in setup: %s", aka2str(nodes.Aka[0]));
if (nodes.RouteVia.zone) {
Syslog('r', "Using RouteVia address %s", aka2str(nodes.RouteVia));
routeto->zone = nodes.RouteVia.zone;
routeto->net = nodes.RouteVia.net;
routeto->node = nodes.RouteVia.node;
routeto->point = nodes.RouteVia.point;
snprintf(routeto->domain, 13, "%s", nodes.RouteVia.domain);
} else {
for (i = 0; i < 20; i++)
if (routeto->zone == nodes.Aka[i].zone)
break;
routeto->zone = nodes.Aka[i].zone;
routeto->net = nodes.Aka[i].net;
routeto->node = nodes.Aka[i].node;
routeto->point = nodes.Aka[i].point;
snprintf(routeto->domain, 13, "%s", nodes.Aka[i].domain);
}
Syslog('r', "Final routing to: %s", aka2str(*routeto));
return R_ROUTE;
}
return rc;
}
int AreWeHost(faddr *dest)
{
int i, j;
/*
* First a fast run in our own zone.
*/
for (i = 0; i < 40; i++)
if (CFG.akavalid[i] && (CFG.aka[i].zone == dest->zone))
if (CFG.aka[i].node == 0)
return i;
for (i = 0; i < 40; i++)
if (CFG.akavalid[i])
if (SearchFidonet(dest->zone))
for (j = 0; j < 6; j++)
if (CFG.aka[i].zone == fidonet.zone[j])
if (CFG.aka[i].node == 0)
return i;
return -1;
}
int AreWeHub(faddr *dest)
{
int i, j;
node *nl;
faddr *fido;
for (i = 0; i < 40; i++)
if (CFG.akavalid[i])
if (CFG.aka[i].zone == dest->zone) {
fido = fido2faddr(CFG.aka[i]);
nl = getnlent(fido);
tidy_faddr(fido);
if (nl->addr.domain)
free(nl->addr.domain);
if (nl->type == NL_HUB)
return i;
}
for (i = 0; i < 40; i++)
if (CFG.akavalid[i])
if (SearchFidonet(dest->zone))
for (j = 0; j < 6; j++)
if (CFG.aka[i].zone == fidonet.zone[j]) {
fido = fido2faddr(CFG.aka[i]);
nl = getnlent(fido);
tidy_faddr(fido);
if (nl->addr.domain)
free(nl->addr.domain);
if (nl->type == NL_HUB)
return i;
}
return -1;
}
/*
* Get routing information for specified netmail address.
*/
int GetRoute(char *ftn, fidoaddr *res)
{
node *dnlent, *bnlent;
unsigned short myregion;
faddr *dest, *best, *maddr;
fidoaddr *fido, dir;
int me_host = -1, me_hub = -1, i;
FILE *fil;
memset(res, 0, sizeof(fidoaddr));
dest = parsefnode(ftn);
if (SearchFidonet(dest->zone)) {
if (dest->domain)
free(dest->domain);
dest->domain = xstrcpy(fidonet.domain);
}
best = bestaka_s(dest);
Syslog('r', "Get def. route for : %s", ascfnode(dest, 0xff));
Syslog('r', "Our best aka is : %s", ascfnode(best, 0xff));
/*
* Check if the destination our point.
*/
for (i = 0; i < 40; i++) {
if (CFG.akavalid[i] &&
(CFG.aka[i].zone == dest->zone) && (CFG.aka[i].net == dest->net) && (CFG.aka[i].node == dest->node)) {
if (dest->point && (!CFG.aka[i].point)) {
Syslog('+', "R: %s => My point", ascfnode(dest, 0xff));
fido = faddr2fido(dest);
memcpy(res, fido, sizeof(fidoaddr));
free(fido);
tidy_faddr(best);
tidy_faddr(dest);
return R_DIRECT;
}
}
}
if (best->point) {
/*
* We are a point, so don't bother the rest of the tests, route
* to our boss.
*/
Syslog('r', "We are a point");
res->zone = best->zone;
res->net = best->net;
res->node = best->node;
res->point = 0;
Syslog('+', "R: %s => My boss %s", ascfnode(dest, 0x0f), aka2str(*res));
tidy_faddr(best);
tidy_faddr(dest);
return R_DIRECT;
}
/*
* Now test several possible setup matches.
*/
dir.zone = dest->zone;
dir.net = dest->net;
dir.node = dest->node;
dir.point = dest->point;
snprintf(dir.domain, 13, "%s", dest->domain);
/*
* First direct match
*/
Syslog('r', "Checking for a direct link, 4d");
if (SearchNode(dir)) {
for (i = 0; i < 20; i++) {
if ((dir.zone == nodes.Aka[i].zone) && (dir.node == nodes.Aka[i].node) &&
(dir.net == nodes.Aka[i].net) && (dir.point == nodes.Aka[i].point)) {
memcpy(res, &nodes.Aka[i], sizeof(fidoaddr));
Syslog('+', "R: %s => Dir link %s", ascfnode(dest, 0x0f), aka2str(*res));
tidy_faddr(best);
tidy_faddr(dest);
return R_DIRECT;
}
}
}
/*
* Again, but now for points
*/
Syslog('r', "Checking for a direct link, 3d");
dir.point = 0;
if (SearchNode(dir)) {
for (i = 0; i < 20; i++) {
if ((dir.zone == nodes.Aka[i].zone) && (dir.node == nodes.Aka[i].node) && (dir.net == nodes.Aka[i].net)) {
memcpy(res, &nodes.Aka[i], sizeof(fidoaddr));
res->point = 0;
Syslog('+', "R: %s => Boss link %s", ascfnode(dest, 0x0f), aka2str(*res));
tidy_faddr(best);
tidy_faddr(dest);
return R_DIRECT;
}
}
}
/*
* Check if we know the uplink, but first check if the node is listed.
*/
Syslog('r', "Checking for a known uplink");
dnlent = (node *)malloc(sizeof(node));
memcpy(dnlent, getnlent(dest), sizeof(node));
if (dnlent->addr.domain)
free(dnlent->addr.domain);
if (!(dnlent->pflag & NL_DUMMY)) {
dir.node = dnlent->upnode;
dir.net = dnlent->upnet;
if (SearchNode(dir)) {
for (i = 0; i < 20; i++) {
if ((dir.zone == nodes.Aka[i].zone) && (dir.node == nodes.Aka[i].node) && (dir.net == nodes.Aka[i].net)) {
memcpy(res, &nodes.Aka[i], sizeof(fidoaddr));
res->point = 0;
Syslog('+', "R: %s => Uplink %s", ascfnode(dest, 0x0f), aka2str(*res));
free(dnlent);
tidy_faddr(best);
tidy_faddr(dest);
return R_DIRECT;
}
}
}
}
/*
* We don't know the route from direct links. We will first see
* what we are, host, hub or node.
*/
me_host = AreWeHost(dest);
if (me_host == -1)
me_hub = AreWeHub(dest);
bnlent = getnlent(best);
myregion = bnlent->region;
Syslog('r', "We are in region %d", myregion);
/*
* This is default routing for hosts:
* 1. Out of zone and region mail goes to the myzone:myregion/0
* 2. Out of net mail goes to host myzone:destnet/0
* 3. Nodes without hub are my downlinks, no route.
* 4. The rest goes to the hubs.
*/
if (me_host != -1) {
Syslog('r', "We are a host");
snprintf(res->domain, 13, "%s", CFG.aka[me_host].domain);
if (((myregion != dnlent->region) && (!(dnlent->pflag & NL_DUMMY))) || (CFG.aka[me_host].zone != dest->zone)) {
res->zone = CFG.aka[me_host].zone;
res->net = myregion;
Syslog('+', "R: %s => Region %s", ascfnode(dest, 0x0f), aka2str(*res));
free(dnlent);
if (bnlent->addr.domain)
free(bnlent->addr.domain);
tidy_faddr(best);
tidy_faddr(dest);
return R_ROUTE;
}
if (CFG.aka[me_host].net != dest->net) {
res->zone = dest->zone;
res->net = dest->net;
Syslog('+', "R: %s => Host %s", ascfnode(dest, 0x0f), aka2str(*res));
free(dnlent);
if (bnlent->addr.domain)
free(bnlent->addr.domain);
tidy_faddr(best);
tidy_faddr(dest);
return R_ROUTE;
}
if (dnlent->upnode == 0) {
res->zone = dest->zone;
res->net = dest->net;
res->node = dest->node;
Syslog('+', "R: %s => Dir link %s", ascfnode(dest, 0x0f), aka2str(*res));
free(dnlent);
if (bnlent->addr.domain)
free(bnlent->addr.domain);
tidy_faddr(best);
tidy_faddr(dest);
return R_ROUTE;
}
res->zone = CFG.aka[me_host].zone;
res->net = dnlent->upnet;
res->node = dnlent->upnode;
Syslog('+', "R: %s => Hub %s", ascfnode(dest, 0x0f), aka2str(*res));
free(dnlent);
if (bnlent->addr.domain)
free(bnlent->addr.domain);
tidy_faddr(best);
tidy_faddr(dest);
return R_ROUTE;
}
/*
* This is the default routing for hubs.
* 1. If the nodes hub is our own hub, it's a downlink.
* 2. Kick everything else to the host.
*/
if (me_hub != -1) {
Syslog('r', "We are a hub");
snprintf(res->domain, 13, "%s", CFG.aka[me_hub].domain);
if ((dnlent->upnode == CFG.aka[me_hub].node) && (dnlent->upnet == CFG.aka[me_hub].net) &&
(dnlent->addr.zone == CFG.aka[me_hub].zone)) {
res->zone = dest->zone;
res->net = dest->net;
res->node = dest->node;
res->point = dest->point;
Syslog('+', "R: %s => Dir link %s", ascfnode(dest, 0x0f), aka2str(*res));
free(dnlent);
if (bnlent->addr.domain)
free(bnlent->addr.domain);
tidy_faddr(best);
tidy_faddr(dest);
return R_DIRECT;
} else {
res->zone = CFG.aka[me_hub].zone;
res->net = CFG.aka[me_hub].net;
Syslog('+', "R: %s => My host %s", ascfnode(dest, 0xff), aka2str(*res));
free(dnlent);
if (bnlent->addr.domain)
free(bnlent->addr.domain);
tidy_faddr(best);
tidy_faddr(dest);
return R_ROUTE;
}
}
free(dnlent);
/*
* Routing for normal nodes, everything goes to the hub or host.
*/
if ((me_hub == -1) && (me_host == -1)) {
Syslog('r', "We are a normal node");
if (bnlent->pflag != NL_DUMMY) {
res->zone = bnlent->addr.zone;
res->net = bnlent->upnet;
res->node = bnlent->upnode;
snprintf(res->domain, 13, "%s", bnlent->addr.domain);
Syslog('+', "R: %s => %s", ascfnode(dest, 0xff), aka2str(*res));
if (bnlent->addr.domain)
free(bnlent->addr.domain);
tidy_faddr(best);
tidy_faddr(dest);
return R_ROUTE;
}
if (bnlent->addr.domain)
free(bnlent->addr.domain);
/*
* If the above failed, we are probably a new node without
* a nodelist entry. We will switch to plan B.
*/
Syslog('r', "Plan B, we are a unlisted node");
if ((fil = fopen(nodes_fil, "r")) != NULL) {
fread(&nodeshdr, sizeof(nodeshdr), 1, fil);
nodes_pos = -1;
while (fread(&nodes, nodeshdr.recsize, 1, fil) == 1) {
fseek(fil, nodeshdr.filegrp + nodeshdr.mailgrp, SEEK_CUR);
for (i = 0; i < 20; i++) {
if ((nodes.Aka[i].zone) && (nodes.Aka[i].zone == best->zone) && (nodes.Aka[i].net == best->net)) {
maddr = fido2faddr(nodes.Aka[i]);
bnlent = getnlent(maddr);
tidy_faddr(maddr);
if (bnlent->addr.domain)
free(bnlent->addr.domain);
if ((bnlent->type == NL_HUB) || (bnlent->type == NL_HOST)) {
fclose(fil);
memcpy(res, &nodes.Aka[i], sizeof(fidoaddr));
Syslog('r', "R: %s => %s", ascfnode(dest, 0xff), aka2str(*res));
tidy_faddr(best);
tidy_faddr(dest);
return R_DIRECT;
}
}
}
}
fclose(fil);
}
}
WriteError("Routing parse error 2");
tidy_faddr(best);
tidy_faddr(dest);
return R_NOROUTE;
}
void TestTracker(faddr *dest)
{
fidoaddr addr, result;
int rc;
char *too;
memset(&addr, 0, sizeof(fidoaddr));
addr.zone = dest->zone;
addr.net = dest->net;
addr.node = dest->node;
addr.point = dest->point;
mbse_colour(LIGHTGRAY, BLACK);
Syslog('+', "Test route to %s", aka2str(addr));
rc = TrackMail(addr, &result);
too = xstrcpy(aka2str(addr));
printf("Route %s => %s, route result: %s\n", too, aka2str(result), get_routetype(rc));
free(too);
}
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