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1cd242c135
deb-mbse/mbcico/emsi.c
Michiel Broek 9eadf0b143 Fixed zmodem timeout bug
2003-09-17 19:33:34 +00:00

628 lines
15 KiB
C
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/*****************************************************************************
*
* $Id$
* Purpose ...............: Fidonet mailer
*
*****************************************************************************
* Copyright (C) 1997-2003
*
* 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/libs.h"
#include "../lib/structs.h"
#include "../lib/users.h"
#include "../lib/records.h"
#include "../lib/common.h"
#include "../lib/nodelist.h"
#include "../lib/dbnode.h"
#include "../lib/clcomm.h"
#include "../lib/mberrors.h"
#include "ttyio.h"
#include "session.h"
#include "statetbl.h"
#include "config.h"
#include "emsi.h"
#include "emsidat.h"
#include "hydra.h"
#include "rdoptions.h"
#include "tcp.h"
#include "wazoo.h"
#include "inbound.h"
#define LOCAL_PROTOS (PROT_ZMO | PROT_ZAP | PROT_HYD | PROT_TCP)
static int rxemsi(void);
static int txemsi(void);
static char *intro;
static int caller;
extern int most_debug;
extern pid_t mypid;
int emsi_local_lcodes;
int emsi_remote_lcodes;
int emsi_local_protos;
int emsi_remote_protos;
int emsi_local_opts;
int emsi_remote_opts;
char *emsi_local_password = NULL;
char *emsi_remote_password = NULL;
char emsi_remote_comm[4]="8N1";
int rx_emsi(char *data)
{
int rc, protect = FALSE;
fa_list *tmr;
int denypw=0;
emsi_local_lcodes = LCODE_RH1;
emsi_remote_lcodes=0;
emsi_local_protos=LOCAL_PROTOS;
if (localoptions & NOZMODEM)
emsi_local_protos &= ~(PROT_ZMO | PROT_ZAP | PROT_DZA);
if (localoptions & NOZEDZAP)
emsi_local_protos &= ~PROT_ZAP;
if (localoptions & NOJANUS)
emsi_local_protos &= ~PROT_JAN;
if (localoptions & NOHYDRA)
emsi_local_protos &= ~PROT_HYD;
if ((session_flags & SESSION_TCP) == 0) {
emsi_local_protos &= ~PROT_TCP;
}
emsi_remote_protos=0;
emsi_local_opts = OPT_XMA;
emsi_remote_opts=0;
emsi_local_password = NULL;
emsi_remote_password = NULL;
intro=data+2;
caller=0;
if ((rc=rxemsi()))
return MBERR_EMSI;
Syslog('i', "local lcodes 0x%04x, protos 0x%04x, opts 0x%04x", emsi_local_lcodes,emsi_local_protos,emsi_local_opts);
Syslog('i', "remote lcodes 0x%04x, protos 0x%04x, opts 0x%04x", emsi_remote_lcodes,emsi_remote_protos,emsi_remote_opts);
if (emsi_remote_opts & OPT_EII) {
emsi_local_opts |= OPT_EII;
}
emsi_local_protos &= emsi_remote_protos;
if (emsi_local_protos & PROT_TCP)
emsi_local_protos &= PROT_TCP;
else if (emsi_local_protos & PROT_HYD)
emsi_local_protos &= PROT_HYD;
else if (emsi_local_protos & PROT_JAN)
emsi_local_protos &= PROT_JAN;
else if (emsi_local_protos & PROT_ZAP)
emsi_local_protos &= PROT_ZAP;
else if (emsi_local_protos & PROT_ZMO)
emsi_local_protos &= PROT_ZMO;
else if (emsi_local_protos & PROT_DZA)
emsi_local_protos &= PROT_DZA;
else if (emsi_local_protos & PROT_KER)
emsi_local_protos &= PROT_KER;
emsi_local_password = NULL;
for (tmr = remote; tmr; tmr = tmr->next)
if (((nlent = getnlent(tmr->addr))) && (nlent->pflag != NL_DUMMY)) {
Syslog('+', "Remote is a listed system");
UserCity(mypid, nlent->sysop, nlent->location);
break;
}
if (nlent)
rdoptions(TRUE);
/*
* Added these options, if they are in the setup for this
* calling node, then disable these options.
*/
if (localoptions & NOHYDRA)
emsi_local_opts &= ~PROT_HYD;
if (localoptions & NOZEDZAP)
emsi_local_opts &= ~PROT_ZAP;
if (localoptions & NOZMODEM)
emsi_local_opts &= ~(PROT_ZMO | PROT_ZAP | PROT_DZA);
if (localoptions & NOFREQS)
emsi_local_opts |= OPT_NRQ;
if (strlen(nodes.Spasswd)) {
if ((strncasecmp(emsi_remote_password, nodes.Spasswd, strlen(nodes.Spasswd)) == 0) &&
(strlen(emsi_remote_password) == strlen(nodes.Spasswd))) {
emsi_local_password = xstrcpy(nodes.Spasswd);
protect = TRUE;
Syslog('+', "Password correct, protected EMSI session");
} else {
denypw = 1;
Syslog('?', "Remote password \"%s\", expected \"%s\"", MBSE_SS(emsi_remote_password), nodes.Spasswd);
emsi_local_password = xstrcpy((char *)"BAD_PASS");
emsi_local_lcodes = LCODE_HAT;
}
} else {
Syslog('i', "No EMSI password check");
Syslog('?', "Unexpected remote password \"%s\"", MBSE_SS(emsi_local_password));
}
inbound_open(remote->addr, protect);
Syslog('i', "local lcodes 0x%04x, protos 0x%04x, opts 0x%04x", emsi_local_lcodes,emsi_local_protos,emsi_local_opts);
if ((rc=txemsi()))
return MBERR_EMSI;
if (denypw || (emsi_local_protos == 0)) {
Syslog('+', "Refusing remote: %s", emsi_local_protos?"bad password presented": "no common protocols");
return 0;
}
IsDoing("EMSI %s inb", ascfnode(remote->addr, 0x0f));
if ((emsi_remote_opts & OPT_NRQ) == 0)
session_flags |= SESSION_WAZOO;
else
session_flags &= ~SESSION_WAZOO;
if (emsi_local_protos & PROT_TCP)
return rxtcp();
else if (emsi_local_protos & PROT_HYD)
return hydra(0);
// else if (emsi_local_protos & PROT_JAN)
// return janus();
else
return rxwazoo();
}
int tx_emsi(char *data)
{
int rc;
emsi_local_lcodes = LCODE_PUA | LCODE_RH1;
emsi_remote_lcodes = 0;
emsi_local_protos=LOCAL_PROTOS;
if (localoptions & NOZMODEM)
emsi_local_protos &= ~(PROT_ZMO | PROT_ZAP | PROT_DZA);
if (localoptions & NOZEDZAP)
emsi_local_protos &= ~PROT_ZAP;
if (localoptions & NOJANUS)
emsi_local_protos &= ~PROT_JAN;
if (localoptions & NOHYDRA)
emsi_local_protos &= ~PROT_HYD;
if ((session_flags & SESSION_TCP) == 0) {
emsi_local_protos &= ~PROT_TCP;
}
emsi_remote_protos=0;
emsi_local_opts=OPT_XMA | OPT_EII | OPT_NRQ;
emsi_remote_opts=0;
emsi_local_password=NULL;
emsi_remote_password=NULL;
intro=data+2;
caller=1;
emsi_local_password=NULL;
Syslog('i', "local lcodes 0x%04x, protos 0x%04x, opts 0x%04x", emsi_local_lcodes,emsi_local_protos,emsi_local_opts);
if ((rc=txemsi()))
return MBERR_EMSI;
else {
if ((rc=rxemsi()))
return MBERR_EMSI;
}
if ((emsi_remote_opts & OPT_EII) == 0) {
emsi_local_opts &= ~OPT_EII;
}
Syslog('i', "remote lcodes 0x%04x, protos 0x%04x, opts 0x%04x", emsi_remote_lcodes,emsi_remote_protos,emsi_remote_opts);
if ((emsi_remote_protos == 0) || (emsi_remote_lcodes & LCODE_HAT)) {
Syslog('+', "Remote refused us: %s", emsi_remote_protos?"traffic held":"no common protos");
return MBERR_SESSION_ERROR;
}
IsDoing("EMSI %s out", ascfnode(remote->addr, 0x0f));
emsi_local_protos &= emsi_remote_protos;
if ((emsi_remote_opts & OPT_NRQ) == 0)
session_flags |= SESSION_WAZOO;
else
session_flags &= ~SESSION_WAZOO;
if (emsi_local_protos & PROT_TCP)
return txtcp();
else if (emsi_local_protos & PROT_HYD)
return hydra(1);
// else if (emsi_local_protos & PROT_JAN)
// return janus();
else
return txwazoo();
}
SM_DECL(rxemsi,(char *)"rxemsi")
SM_STATES
init,
waitpkt,
waitchar,
checkemsi,
getdat,
checkpkt,
checkdat,
sendnak,
sendack
SM_NAMES
(char *)"init",
(char *)"waitpkt",
(char *)"waitchar",
(char *)"checkemsi",
(char *)"getdat",
(char *)"checkpkt",
(char *)"checkdat",
(char *)"sendnak",
(char *)"sendack"
SM_EDECL
int c = 0;
unsigned short lcrc, rcrc;
int len;
int standby = 0, tries = 0;
char buf[13], *p;
char *databuf = NULL;
p = buf;
databuf = xstrcpy(intro);
SM_START(init)
SM_STATE(init)
Syslog('i', "RXEMSI: init");
gpt_resettimers();
gpt_settimer(0, 60);
gpt_settimer(1, 20);
SM_PROCEED(checkpkt);
SM_STATE(waitpkt)
Syslog('i', "RXEMSI: waitpkt");
standby = 0;
gpt_settimer(1, 20);
SM_PROCEED(waitchar);
SM_STATE(waitchar)
Syslog('i', "RXEMSI: waitchar, tries=%d", tries);
if (gpt_expired(0)) {
Syslog('+', "EMSI receive 60 seconds timeout");
SM_ERROR;
}
if (gpt_expired(1)) {
Syslog('s', "20 sec timeout");
SM_PROCEED(sendnak);
}
c = GETCHAR(1);
if (c == TIMEOUT) {
SM_PROCEED(waitchar);
} else if (c < 0) {
SM_ERROR;
} else if ((c >= ' ') && (c <= '~')) {
if (c == '*') {
standby = 1;
p = buf;
*p = '\0';
} else if (standby) {
if ((p - buf) < (sizeof(buf) - 1)) {
*p++ = c;
*p = '\0';
} if ((p - buf) >= (sizeof(buf) - 1)) {
standby = 0;
SM_PROCEED(checkemsi);
}
}
} else {
switch(c) {
case DC1: break;
case '\n':
case '\r': standby = 0;
break;
default: standby = 0;
break;
}
}
SM_PROCEED(waitchar);
SM_STATE(checkemsi)
Syslog('i', "RXEMSI: rcvd %s", printable(buf, 0));
if (strncasecmp(buf, "EMSI_DAT",8) == 0) {
SM_PROCEED(getdat);
} else if (strncasecmp(buf, "EMSI_",5) == 0) {
if (databuf)
free(databuf);
databuf = xstrcpy(buf);
SM_PROCEED(checkpkt);
} else {
SM_PROCEED(waitpkt);
}
SM_STATE(getdat)
if (sscanf(buf+8,"%04x",&len) != 1) {
SM_PROCEED(sendnak);
}
len += 16; /* strlen("EMSI_DATxxxxyyyy"), include CRC */
if (databuf)
free(databuf);
databuf = malloc(len + 1);
strcpy(databuf, buf);
p = databuf + strlen(databuf);
while (((p-databuf) < len) && ((c=GETCHAR(8)) >= 0)) {
*p++ = c;
*p = '\0';
}
Syslog('i', "RXEMSI: rcvd %s (%d bytes)", databuf, len);
if (c == TIMEOUT) {
SM_PROCEED(sendnak);
} else if (c < 0) {
Syslog('+', "Error while reading EMSI_DAT packet");
SM_ERROR;
}
SM_PROCEED(checkdat);
SM_STATE(checkpkt)
Syslog('i', "RXEMSI: checkpkt");
if (strncasecmp(databuf,"EMSI_DAT",8) == 0) {
SM_PROCEED(checkdat);
}
lcrc = crc16xmodem(databuf, 8);
sscanf(databuf + 8, "%04hx", &rcrc);
if (lcrc != rcrc) {
Syslog('+', "Got EMSI packet \"%s\" with bad crc: %04x/%04x", printable(databuf, 0), lcrc, rcrc);
SM_PROCEED(sendnak);
} if (strncasecmp(databuf, "EMSI_HBT", 8) == 0) {
tries = 0;
SM_PROCEED(waitpkt);
} else if (strncasecmp(databuf, "EMSI_INQ", 8) == 0) {
SM_PROCEED(sendnak);
} else {
SM_PROCEED(waitpkt);
}
SM_STATE(checkdat)
sscanf(databuf + 8, "%04x", &len);
if (len != (strlen(databuf) - 16)) {
Syslog('+', "Bad EMSI_DAT length: %d/%d", len, strlen(databuf));
SM_PROCEED(sendnak);
}
/* Some FD versions send length of the packet including the
trailing CR. Arrrgh! Dirty overwork follows: */
if (*(p = databuf + strlen(databuf) - 1) == '\r')
*p='\0';
sscanf(databuf + strlen(databuf) - 4, "%04hx", &rcrc);
*(databuf + strlen(databuf) - 4) = '\0';
lcrc = crc16xmodem(databuf, strlen(databuf));
if (lcrc != rcrc) {
Syslog('+', "Got EMSI_DAT packet \"%s\" with bad crc: %04x/%04x", printable(databuf, 0), lcrc, rcrc);
SM_PROCEED(sendnak);
} if (scanemsidat(databuf + 12) == 0) {
SM_PROCEED(sendack);
} else {
Syslog('+', "Could not parse EMSI_DAT packet \"%s\"",databuf);
SM_ERROR;
}
SM_STATE(sendnak)
/*
* The FSC-0059 says 6 attempts, but to accept maindoor sessions
* we seem to need about 11, we set it to 20 since we also have
* a global 60 seconds timer running.
*/
if (++tries > 19) {
Syslog('+', "Too many tries getting EMSI_DAT");
SM_ERROR;
} if (caller) {
PUTSTR((char *)"**EMSI_NAKEEC3\r\021");
Syslog('i', "RXEMSI: send **EMSI_NAKEEC3");
} else {
PUTSTR((char *)"**EMSI_REQA77E\r\021");
Syslog('i', "RXEMSI: send **EMSI_REQA77E");
if (tries > 1) {
PUTSTR((char *)"**EMSI_NAKEEC3\r\021");
Syslog('i', "RXEMSI: send **EMSI_NAKEEC3");
}
}
SM_PROCEED(waitpkt);
SM_STATE(sendack)
Syslog('i', "RXEMSI: send **EMSI_ACKA490 (2 times)");
PUTSTR((char *)"**EMSI_ACKA490\r\021");
PUTSTR((char *)"**EMSI_ACKA490\r\021");
SM_SUCCESS;
SM_END
Syslog('i', "RXEMSI: end");
free(databuf);
SM_RETURN
SM_DECL(txemsi,(char *)"txemsi")
SM_STATES
senddata,
waitpkt,
waitchar,
checkpkt,
sendack
SM_NAMES
(char *)"senddata",
(char *)"waitpkt",
(char *)"waitchar",
(char *)"checkpkt",
(char *)"sendack"
SM_EDECL
int c;
unsigned short lcrc, rcrc;
int standby = 0, tries = 0;
char buf[13], *p;
char trailer[8];
p = buf;
memset(&buf, 0, sizeof(buf));
strncpy(buf, intro, sizeof(buf) - 1);
gpt_resettimers();
gpt_settimer(0, 60);
Syslog('i', "TXEMSI: 60 seconds timer set");
SM_START(senddata)
Syslog('i', "TXEMSI: start");
SM_STATE(senddata)
p = mkemsidat(caller);
PUTCHAR('*');
PUTCHAR('*');
PUTSTR(p);
sprintf(trailer, "%04X\r\021", crc16xmodem(p, strlen(p)));
PUTSTR(trailer);
Syslog('i', "TXEMSI: send **%s%04X", p, crc16xmodem(p, strlen(p)));
free(p);
gpt_settimer(1, 20);
SM_PROCEED(waitpkt);
SM_STATE(waitpkt)
standby = 0;
SM_PROCEED(waitchar);
SM_STATE(waitchar)
if (gpt_expired(0)) {
Syslog('+', "EMSI transmit 60 seconds timeout");
SM_ERROR;
}
if (gpt_expired(1)) {
Syslog('i', "TXEMSI: 20 seconds timeout");
if (++tries > 19) {
Syslog('+', "too many tries sending EMSI");
SM_ERROR;
} else {
SM_PROCEED(senddata);
}
}
c = GETCHAR(1);
if (c == TIMEOUT) {
SM_PROCEED(waitchar);
} else if (c < 0) {
SM_ERROR;
} else if ((c >= ' ') && (c <= '~')) {
if (c == '*') {
standby = 1;
p = buf;
*p = '\0';
} else if (standby) {
if ((p - buf) < (sizeof(buf) - 1)) {
*p++ = c;
*p = '\0';
} if ((p - buf) >= (sizeof(buf) - 1)) {
standby = 0;
SM_PROCEED(checkpkt);
}
}
} else
switch(c) {
case DC1: SM_PROCEED(waitchar);
break;
case '\n':
case '\r': standby = 0;
break;
default: standby = 0;
break;
}
SM_PROCEED(waitchar);
SM_STATE(checkpkt)
Syslog('i', "TXEMSI: rcvd %s", buf);
if (strncasecmp(buf, "EMSI_DAT", 8) == 0) {
SM_PROCEED(sendack);
} else if (strncasecmp(buf, "EMSI_", 5) == 0) {
lcrc = crc16xmodem(buf, 8);
sscanf(buf + 8, "%04hx", &rcrc);
if (lcrc != rcrc) {
Syslog('+', "Got EMSI packet \"%s\" with bad crc: %04x/%04x", printable(buf, 0), lcrc, rcrc);
SM_PROCEED(senddata);
} if (strncasecmp(buf, "EMSI_REQ", 8) == 0) {
SM_PROCEED(waitpkt);
} if (strncasecmp(buf, "EMSI_ACK", 8) == 0) {
SM_SUCCESS;
} else {
SM_PROCEED(senddata);
}
} else {
SM_PROCEED(waitpkt);
}
SM_STATE(sendack)
Syslog('i', "TXEMSI: send **EMSI_ACKA490 (2 times)");
PUTSTR((char *)"**EMSI_ACKA490\r\021");
PUTSTR((char *)"**EMSI_ACKA490\r\021");
SM_PROCEED(waitpkt);
SM_END
Syslog('i', "TXEMSI: end");
SM_RETURN
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