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deb-mbse/mbcico/tcpproto.c

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2001-08-17 05:46:24 +00:00
/*****************************************************************************
*
* File ..................: mbcico/tcpproto.c
* Purpose ...............: Fidonet mailer
* Last modification date : 24-Dec-2000
*
*****************************************************************************
* Copyright (C) 1997-2000
*
* 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.
*****************************************************************************/
/*
contributed by Stanislav Voronyi <stas@uanet.kharkov.ua>
*/
#include "../lib/libs.h"
#include "../lib/structs.h"
#include "../lib/common.h"
#include "../lib/clcomm.h"
#include "ttyio.h"
#include "session.h"
#include "config.h"
#include "emsi.h"
#include "lutil.h"
#include "openfile.h"
#include "filelist.h"
#include "tcpproto.h"
#define TCP_CMD 0x87
#define TCP_DATA 0xe1
static FILE *fout;
static FILE *in;
static char txbuf[2048];
static char rxbuf[2048];
static int rx_type;
static long startime,endtime,rxbytes,sbytes;
static int sendfile(char *,char *);
static int finsend(void);
static int receivefile(char *,time_t,off_t);
static int resync(off_t);
static int closeit(int);
static int tcp_sblk(char *,int,int);
static int tcp_rblk(char *,int *);
static int getsync(void);
extern unsigned long sentbytes;
extern unsigned long rcvdbytes;
extern char *ttystat[];
int tcpsndfiles(file_list *lst)
{
int rc = 0, maxrc = 0;
file_list *tmpf;
Syslog('+', "Start TCP send%s",lst?"":" (dummy)");
if (getsync()) {
WriteError("Can't get synchronization");
return 1;
}
for (tmpf = lst; tmpf && (maxrc == 0); tmpf = tmpf->next) {
if (tmpf->remote) {
rc = sendfile(tmpf->local,tmpf->remote);
rc = abs(rc);
if (rc > maxrc)
maxrc=rc;
if (rc == 0)
execute_disposition(tmpf);
} else
if (maxrc == 0)
execute_disposition(tmpf);
}
if (maxrc < 2) {
rc = finsend();
rc = abs(rc);
}
if (rc > maxrc)
maxrc=rc;
if (rc)
WriteError("TCP send error: rc=%d",maxrc);
return maxrc;
}
int tcprcvfiles(void)
{
int rc, bufl;
long filesize, filetime;
char *filename, *p;
Syslog('+', "Start TCP receive");
if (getsync()) {
WriteError("Can't get synchronization");
return 1;
}
next:
if ((rc = tcp_rblk(rxbuf, &bufl)) == 0) {
if (strncmp(rxbuf, "SN", 2) == 0) {
rc = tcp_sblk((char *)"RN", 2, TCP_CMD);
return rc;
} else if (*rxbuf == 'S') {
p = strchr(rxbuf+2, ' ');
if (p != NULL)
*p=0;
else
return 1;
filename = xstrcpy(rxbuf+2);
p++;
filesize = strtol(p, &p, 10);
filetime = strtol(++p, (char **)NULL, 10);
} else
return rc==0?1:rc;
if (strlen(filename) && filesize && filetime)
rc = receivefile(filename,filetime,filesize);
if (fout) {
if (closeit(0))
WriteError("Error closing file");
(void)tcp_sblk((char *)"FERROR",6,TCP_CMD);
} else
goto next;
}
if (rc)
WriteError("TCP receive error: rc=%d", rc);
return abs(rc);
}
static int sendfile(char *ln, char *rn)
{
int rc=0;
struct stat st;
struct flock fl;
int bufl, sverr;
long offset;
fl.l_type = F_RDLCK;
fl.l_whence = 0;
fl.l_start = 0L;
fl.l_len = 0L;
if ((in = fopen(ln,"r")) == NULL) {
sverr = errno;
if ((sverr == ENOENT) || (sverr == EINVAL)) {
Syslog('+', "File %s doesn't exist, removing", MBSE_SS(ln));
return 0;
} else {
WriteError("$tcpsend: cannot open file %s, skipping", MBSE_SS(ln));
return 1;
}
}
if (fcntl(fileno(in), F_SETLK, &fl) != 0) {
Syslog('+', "$tcpsend: cannot lock file %s, skipping", MBSE_SS(ln));
fclose(in);
return 1;
}
if (stat(ln, &st) != 0) {
Syslog('+', "$tcpsend: cannot access \"%s\", skipping", MBSE_SS(ln));
fclose(in);
return 1;
}
if (st.st_size > 0) {
Syslog('+', "TCP send \"%s\" as \"%s\"", MBSE_SS(ln), MBSE_SS(rn));
Syslog('+', "TCP size %lu bytes, dated %s", (unsigned long)st.st_size, date(st.st_mtime));
(void)time(&startime);
} else {
Syslog('+', "File \"%s\" has 0 size, skiped",ln);
return 0;
}
sprintf(txbuf,"S %s %lu %lu",rn,(unsigned long)st.st_size,st.st_mtime+(st.st_mtime%2));
bufl = strlen(txbuf);
rc = tcp_sblk(txbuf, bufl, TCP_CMD);
rc = tcp_rblk(rxbuf, &bufl);
if (strncmp(rxbuf,"RS",2) == 0) {
Syslog('+', "File %s already received, skipping",rn);
return 0;
} else if (strncmp(rxbuf,"RN",2) == 0) {
Syslog('+', "Remote refused file, aborting",rn);
return 2;
} else if (strncmp(rxbuf,"ROK",3) == 0) {
if (bufl > 3 && rxbuf[3]==' ') {
offset = strtol(rxbuf+4,(char **)NULL,10);
if (fseek(in,offset,SEEK_SET) != 0) {
WriteError("$tcpsend cannot seek in file %s",ln);
return 1;
}
} else
offset = 0;
} else
return rc;
while ((bufl = fread(&txbuf, 1, 1024, in)) != 0) {
if ((rc = tcp_sblk(txbuf, bufl, TCP_DATA)) > 0)
break;
}
fclose(in);
if (rc == 0){
strcpy(txbuf, "EOF");
rc = tcp_sblk(txbuf, 3, TCP_CMD);
rc = tcp_rblk(rxbuf, &bufl);
}
if (rc == 0 && strncmp(rxbuf,"FOK",3) == 0) {
(void)time(&endtime);
if ((startime=endtime-startime) == 0)
startime = 1;
Syslog('a', "st_size %d, offset %d",st.st_size,offset);
Syslog('+', "Sent %lu bytes in %s (%ld cps)",
(unsigned long)st.st_size-offset,
str_time(startime),
(long)(st.st_size-offset)/startime);
sentbytes += (unsigned long)st.st_size - offset;
return 0;
} else if(strncmp(rxbuf,"FERROR",6) == 0){
WriteError("$tcpsend remote file error",ln);
return rc==0?1:rc;
} else
return rc==0?1:rc;
}
static int resync(off_t off)
{
sprintf(txbuf,"ROK %ld",(long)off);
return 0;
}
static int closeit(int success)
{
int rc;
rc = closefile(success);
fout = NULL;
sbytes = rxbytes - sbytes;
(void)time(&endtime);
if ((startime = endtime - startime) == 0L)
startime = 1L;
Syslog('+', "%s %lu bytes in %s (%ld cps)",
success?"OK":"dropped after",
sbytes, str_time(startime), sbytes / startime);
rcvdbytes += sbytes;
return rc;
}
static int finsend(void)
{
int rc,bufl;
rc = tcp_sblk((char *)"SN",2,TCP_CMD);
if(rc)
return rc;
rc = tcp_rblk(rxbuf,&bufl);
if (strncmp(rxbuf, "RN", 2) == 0)
return rc;
else
return 1;
}
static int receivefile(char *fn, time_t ft, off_t fs)
{
int rc, bufl;
Syslog('+', "TCP receive \"%s\" (%lu bytes) dated %s",fn,fs,date(ft));
strcpy(txbuf,"ROK");
fout = openfile(fn, ft, fs, &rxbytes, resync);
(void)time(&startime);
sbytes = rxbytes;
if (fs == rxbytes) {
Syslog('+', "Skipping %s", fn);
fout = NULL;
rc = tcp_sblk((char *)"RS",2,TCP_CMD);
return rc;
}
if (!fout)
return 1;
bufl = strlen(txbuf);
rc = tcp_sblk(txbuf,bufl,TCP_CMD);
while ((rc = tcp_rblk(rxbuf, &bufl)) == 0) {
if (rx_type == TCP_CMD)
break;
if (fwrite(rxbuf, 1, bufl, fout) != bufl)
break;
rxbytes += bufl;
}
if (rc)
return rc;
if (rx_type == TCP_CMD && bufl == 3 && strncmp(rxbuf,"EOF",3) == 0) {
if (ftell(fout) == fs) {
closeit(1);
rc = tcp_sblk((char *)"FOK",3,TCP_CMD);
return rc;
} else
return 1;
} else
return 1;
}
static int tcp_sblk(char *buf, int len, int typ)
{
Nopper();
if (typ == TCP_CMD)
Syslog('A', "tcp_sblk: cmd: %s", buf);
else
Syslog('A', "tcp_sblk: data: %d bytes", len);
PUTCHAR(0xc6);
PUTCHAR(typ);
PUTCHAR((len >> 8) & 0x0ff);
PUTCHAR(len & 0x0ff);
PUT(buf, len);
PUTCHAR(0x6c);
FLUSHOUT();
if (tty_status)
WriteError("TCP send error: %s", ttystat[tty_status]);
else
Syslog('A', "tcp_sblk: complete");
return tty_status;
}
static int tcp_rblk(char *buf, int *len)
{
int c;
Syslog('A', "tcp_rblk: start");
*len = 0;
/*
* Wait up to 3 minutes for the header
*/
c = GETCHAR(180);
if (tty_status)
goto to;
if (c != 0xc6) {
WriteError("tcp_rblk: got %d instead of block header", c);
return c;
}
/*
* Get block type
*/
c = GETCHAR(120);
if (tty_status)
goto to;
rx_type = c;
if (c != TCP_CMD && c != TCP_DATA) {
WriteError("tcp_rblk: got %d character instead of DATA/CMD", c);
return c;
}
/*
* Get block length
*/
c = GETCHAR(120);
if (tty_status)
goto to;
*len = c << 8;
c = GETCHAR(120);
if (tty_status)
goto to;
*len += c;
Syslog('A', "tcp_rblk: expecting %d bytes", *len);
/*
* Get actual data block
*/
GET(buf, *len, 120);
if (tty_status)
goto to;
/*
* Get block trailer
*/
c = GETCHAR(120);
if (tty_status)
goto to;
if (c != 0x6c)
return c;
if (rx_type == TCP_CMD) {
buf[*len] = '\0';
Syslog('A', "tcp_rblk: cmd: %s", buf);
} else
Syslog('A', "tcp_rblk: data: %d bytes", *len);
to:
if (tty_status)
WriteError("TCP receive error: %s", ttystat[tty_status]);
return tty_status;
}
static int getsync(void)
{
int c;
PUTCHAR(0xaa);
PUTCHAR(0x55);
FLUSHOUT();
Syslog('a', "getsync try to synchronize");
gs:
if (tty_status) {
WriteError("TCP getsync failed %s", ttystat[tty_status]);
return 1;
}
while ((c = GETCHAR(180)) != 0xaa)
if (tty_status) {
WriteError("TCP getsync failed: %s", ttystat[tty_status]);
return 1;
}
if ((c = GETCHAR(120)) != 0x55)
goto gs;
Syslog('a', "getsync done, tty_status %s", ttystat[tty_status]);
return tty_status;
}