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bintec-capi-isdnlogin
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bintec-capi-isdnlogin/xmodem.c

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/************************************************************************
* (C)opyright 1991-1999 BinTec Communications AG, All Rights Reserved
*
* Title: XMODEM transfer functions
* Author: bernd
* $RCSfile: xmodem.c,v $
* $Revision: 74 $
* $Date: 2005-12-22 01:06:50 +0100 (Thu, 22 Dec 2005) $
* $State: Exp $
*
* Type: library
* Products: ALL
* Interfaces: -
* Libraries: -
* Switches: -
* Description: --
*-----------------------------------------------------------------------
* Current Log:
***********************************************************************/
#ifdef USE_RCSID_C
static const char _rcsid_xmodem_c[] __UNUSED = "$Id: xmodem.c,v 1.2 2003/07/30 11:26:56 shoki Exp $";
#endif
#if WITH_UNFINISHED_XMODEM
#include "isdnlogin.h"
#define TRACE printf
static void trace(const char *fmt, ...)
{ }
/*
* CRC-16 constant array... from Usenet contribution by Mark G. Mendel,
* Network Systems Corp. (ihnp4!umn-cs!hyper!mark)
*/
static unsigned short crctab[1 << B] = {
0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
};
/*******************************************************************************
* function: readbyte
* Read one byte from data stream (with timeout)
* parameters:
* fd i/o pathes of data stream
* seconds timeout
* return: byte or TIMEOUT
******************************************************************************/
static int readbyte(rwfd_t fd, int seconds)
{
struct pollfd pfd;
unsigned char c;
unsigned char proto[1024];
unsigned char data[4096];
union CAPI_primitives *capi;
int lcause;
do {
if (capi2_wait_for_signal(fd.rd, seconds * 1000 ) == CAPI2_E_MSG_QUEUE_EMPTY) {
printf("readbyte timeout %d\n", seconds);
return TIMEOUT;
} else {
lcause = capi2_get_message( fd.rd, &capi,
(union CAPI_primitives *)proto, &c, 1);
//printf("capi=%x\n", GET_PRIMTYPE(capi));
}
} while (GET_PRIMTYPE(capi) != CAPI2_DATAB3_IND);
capi2_datab3_resp( fd.rd,
GET_MESSID(capi),
fd.ident,
GET_WORD(capi->c2datab3_ind.handle));
return c;
}
/*******************************************************************************
* function: readdata
* Read block of data from given i/o pathes (with timeout)
* parameters:
* x xmodem handle
* bufsize receiver buffer size
* checksum accumulated crc
* return: data byte or TIMEOUT
******************************************************************************/
static int readdata(xmodem_t *x, int bufsize, int *checksum)
{
int c; /* character being processed */
unsigned short chksm; /* working copy of checksum */
int j; /* loop index */
chksm = 0;
for (j = 0; j < bufsize; j++) {
if ((c = readbyte(x->fd, 1)) == TIMEOUT) { /* 1s timeout */
return TIMEOUT;
}
x->buf[j] = c & 0xff;
if (x->crcmode) /* CRC */
chksm = (chksm << B) ^ crctab[(chksm >> (W - B)) ^ c];
else /* checksum */
chksm = ((chksm + c) & 0xff);
}
*checksum = chksm;
TRACE("XMODEM read (%d bytes)", j);
return (0);
}
/*******************************************************************************
* function: sendbyte
* Write one byte to data stream
* parameters:
* fd i/o pathes of data stream
* data data byte
* return: -
******************************************************************************/
static void sendbyte(rwfd_t fd, char data)
{
TRACE("XMODEM write (%d bytes)", 1);
//write(fd.wr, &data, 1);
capi2_datab3_req( fd.wr, fd.ident, &data, 1, 0, fd.handle);
}
/*******************************************************************************
* function: purge
* Wait for the line to clear (read rest)
* parameters:
* fd i/o pathes of data stream
* return: -
******************************************************************************/
static void purge(rwfd_t fd)
{
int c;
while ((c = readbyte(fd, 1)) != TIMEOUT) ;
}
/*******************************************************************************
* function: purge
* Send CAN twice
* parameters:
* fd i/o pathes of data stream
* return: -
******************************************************************************/
static void cancel(rwfd_t fd)
{
sendbyte(fd, CAN);
sendbyte(fd, CAN);
purge(fd);
sendbyte(fd, CAN);
sleep(1);
}
/*******************************************************************************
* function: xmodem_open
* Open console and set baud rate
* parameters:
* dev device name (e.g. "consexcl")
* or NULL for stdio (baud rate ignored!)
* baud baud rate [baud]
* one_kb xmodem-1k mode enable
* emsg buffer for error message (80 bytes)
* return: xmodem ptr or error (NULL)
******************************************************************************/
xmodem_t *xmodem_open(call_t *ptrCall, int baud, int one_kb, char *emsg, char *filename)
{
int fd;
xmodem_t *x = malloc(sizeof *x);
if (!x) {
if (emsg) sprintf(emsg, "XMODEM: out of memory");
return 0;
}
memset(x, 0, sizeof *x);
reset_terminal(); /* unraw terminal */
if (ptrCall) {
/*------------------------------+
| i/o via stdio pathes |
+------------------------------*/
TRACE("XMODEM via CAPI");
x->conmode = 0;
x->fd.rd = ptrCall->capi_fd; /* use stdio pathes */
x->fd.wr = ptrCall->capi_fd;
x->fd.ident = ptrCall->ident;
} else {
TRACE("XMODEM via stdio");
x->conmode = 0;
x->fd.rd = STDIN;
x->fd.wr = STDOUT;
}
if (filename) {
x->sendfp = fopen(filename, "r");
/* XXX: check for fopen errors here */
if (!x->sendfp) {
/* failure */
return 0;
}
} else {
TRACE("XMODEM no filename to send specified");
return 0;
}
x->failed = FALSE;
x->crcmode = TRUE;
x->rcvstartch = x->crcmode ? CRCCHR : NAK;
x->one_kb = one_kb & 1; /* only relevant for sending packets */
x->starttime = time(NULL);
return x;
}
/*******************************************************************************
* function: xmodem_onekb
* Return if modem-1k mode enabled
* parameters:
* x xmodem ptr
* return: modem-1k mode enabled (1) or not (0)
******************************************************************************/
int xmodem_onekb(xmodem_t *x)
{
return x->one_kb;
}
/*******************************************************************************
* function: xmodem_cancel
* Send CAN to stop an unterminated getpkt transfer
* parameters:
* x xmodem ptr
* return: -
******************************************************************************/
void xmodem_cancel(xmodem_t *x)
{
cancel(x->fd);
}
/*******************************************************************************
* function: xmodem_close
* Close device and free memory
* parameters:
* x xmodem ptr
* return: success (0) or error code
******************************************************************************/
void xmodem_close(xmodem_t *x)
{
time_t tdiff;
if (x->fd.rd != -1) {
if (x->conmode) {
close(x->fd.rd);
}
}
if (x->sendfp) {
fclose (x->sendfp); /* close opened file to send */
x->sendfp = NULL;
}
x->fd.rd = -1;
if (x->starttime) {
tdiff = time(NULL) - x->starttime;
printf("duration: %d\n", tdiff );
}
free(x);
set_raw_terminal(); /* enable raw terminal mode */
}
#ifdef USE_UNPORTED
/*******************************************************************************
* function: xmodem_getpkt
* Receive one XMODEM-Packet and write it into buf
*
* The length of the packet is written into (*lenp).
* An error message is written into emsg.
* The length of data packets (128/1024) is determined by the remote site
* parameters:
* x xmodem ptr
* buf data packet buffer (1024 bytes)
* lenp length of the data packet
* emsg buffer for error message (80 bytes)
* return: status code
* XMODEM_RCVPKT: successfully received one packet
* XMODEM_EOT: received End-of-Transmission character
* XMODEM_ERROR: receive failed
******************************************************************************/
int xmodem_getpkt(xmodem_t *x, char *buf, int *lenp, char *emsg)
{
int checksum, /* packet checksum */
firstchar, /* first character of a packet */
sectcurr, /* second byte of packet--should be packet */
/* number (mod 128) */
sectcomp, /* third byte of packet--should be complement */
/* of sectcurr */
errorflag, /* set true when packet (or first char of */
/* putative packet) is invalid */
inchecksum, /* incoming checksum or CRC */
msb, lsb, /* incoming checksum (upper/lower byte) */
duplicate, /* got duplicate packet */
timeout, /* read timeout */
bufsize; /* packet size (128 or 1024) */
sendbyte(x->fd, x->rcvstartch);
restart:
bufsize = 128;
errorflag = FALSE;
duplicate = FALSE;
timeout = FALSE;
*lenp = 0;
do { /* start by reading first byte in packet */
if ((firstchar = readbyte(x->fd, 4)) == TIMEOUT) {
errorflag = timeout = TRUE;
goto abort;
}
} while ((firstchar != SOH)
&& (firstchar != STX)
&& (firstchar != EOT)
&& (firstchar != ACK || x->recvsectcnt > 0)
&& (firstchar != CAN));
if (firstchar == EOT) { /* check for REAL EOT */
TRACE("EOT");
if (readbyte(x->fd, 1) != TIMEOUT) {
errorflag = timeout = TRUE;
TRACE("ignoring extra characters");
goto abort;
}
}
if (firstchar == CAN) { /* bailing out? */
TRACE("CAN");
if ((readbyte(x->fd, 3) & 0x7f) == CAN) {
sleep(1);
if (emsg) strcpy(emsg, "XMODEM: canceled by user");
return XMODEM_ERROR;
} else {
errorflag = TRUE;
goto abort;
}
}
if (firstchar == SOH || firstchar == STX) { /* start reading packet */
bufsize = (firstchar == SOH) ? 128 : 1024;
if (x->recvsectcnt == 0) { /* 1st data packet, initialize */
if (bufsize == 1024) {
TRACE("1K packet mode chosen");
}
x->errors = 0;
x->got_eot = 0;
}
if ((sectcurr = readbyte(x->fd, 3)) == TIMEOUT ||
(sectcomp = readbyte(x->fd, 3)) == TIMEOUT) {
errorflag = timeout = TRUE;
goto abort;
}
TRACE("%s: sectcurr=0x%02x sectcomp=0x%02x",
firstchar==SOH ? "SOH":"STX", sectcurr, sectcomp);
if ((sectcurr + sectcomp) == 0xff) { /* is packet number
* checksum correct? */
if (sectcurr == ((x->sectnum + 1) & 0xff)) {
/*
* Read, process and calculate checksum for a buffer of
* data
*/
if ((readdata(x, bufsize, &checksum)) == TIMEOUT) {
errorflag = timeout = TRUE;
goto abort;
}
/* verify checksum or CRC */
if (x->crcmode) {
checksum &= 0xffff;
/* get 16-bit CRC */
if ((msb = readbyte(x->fd, 3)) == TIMEOUT ||
(lsb = readbyte(x->fd, 3)) == TIMEOUT) {
errorflag = timeout = TRUE;
goto abort;
}
inchecksum = (msb << 8) | lsb;
} else {
/* get simple 8-bit checksum */
if ((inchecksum = readbyte(x->fd, 3)) == TIMEOUT) {
errorflag = timeout = TRUE;
goto abort;
}
}
if (inchecksum == checksum) { /* good checksum, hence
* good packet */
x->errors = 0;
x->recvsectcnt += (bufsize == 128) ? 1 : 8;
x->sectnum = sectcurr;
memcpy(buf, x->buf, bufsize);
*lenp = bufsize;
x->rcvstartch = ACK;
}
/*
* Start handling various errors and special
* conditions
*/
else { /* bad checksum */
TRACE("checksum error crcmode=%d: inchecksum=%x crc=%x",
x->crcmode, inchecksum, checksum);
errorflag = TRUE;
}
} else { /* sector number is wrong */
if (sectcurr == x->sectnum) { /* duplicate sector? */
errorflag = TRUE;
duplicate = TRUE;
TRACE("duplicate sector");
while (readbyte(x->fd, 3) != TIMEOUT);
} else { /* no, real phase error */
errorflag = TRUE;
x->failed = TRUE;
cancel(x->fd);
TRACE("phase error, expected sector=%d", x->recvsectcnt);
}
}
} else { /* bad packet number checksum */
TRACE("wrong header sector number");
errorflag = TRUE;
}
} /* END reading packet loop */
abort:
if (timeout) TRACE("timeout sector=%d", x->recvsectcnt);
if ((errorflag && !x->failed) || x->recvsectcnt == 0) {
if (errorflag) x->errors++;
if (x->recvsectcnt != 0) {
while (readbyte(x->fd, 3) != TIMEOUT) ;/* wait for line to settle if
* not beginning */
}
if (duplicate) {
sendbyte(x->fd, ACK);
} else if (x->crcmode && x->recvsectcnt == 0 && x->errors == CRCSWMAX) {
x->crcmode = FALSE;
TRACE("CRC mode not accepted");
purge(x->fd);
sendbyte(x->fd, NAK);
} else if (!x->crcmode && x->recvsectcnt == 0 && x->errors == CRCSWMAX){
x->crcmode = TRUE;
TRACE("checksum mode not accepted");
purge(x->fd);
sendbyte(x->fd, CRCCHR);
} else if (x->crcmode && x->recvsectcnt == 0) {
purge(x->fd);
sendbyte(x->fd, CRCCHR);
} else {
purge(x->fd);
sendbyte(x->fd, NAK);
}
}
if (firstchar == EOT) {
x->got_eot = 1;
sendbyte(x->fd, ACK);
sleep(1);
return XMODEM_EOT;
} else if (x->failed || x->errors >= ERRORMAX) {
cancel(x->fd);
x->failed = 1;
if (emsg) strcpy(emsg, "XMODEM: too many errors");
return XMODEM_ERROR;
} else if (errorflag) {
goto restart;
} else {
return XMODEM_RCVPKT;
}
}
#endif
/*******************************************************************************
* function: xmodem_putpkt
* Send one XMODEM packet
*
* The protocol packet length is 128 or 1024 bytes padded with CTRL-Z.
* If len argument is not 128/1024, this is the last packet and an EOT is
* sent to the remote site after sending the data packet.
* If the last packet sent had 128/1024 bytes, the application must invoke
* this funktion again with len=0 to indicate EOT.
* parameters:
* x xmodem ptr
* buf data packet buffer (1024 bytes)
* len length of the data packet
* emsg buffer for error message (80 bytes)
* return: 0 if error
******************************************************************************/
int xmodem_putpkt(xmodem_t *x, char *data, int len, char *emsg)
{
int bufctr; /* array index for data buffer */
unsigned short checksum; /* checksum/crc */
int attempts, /* number of attempts made to xmit a packet */
sendfin, /* flag that we are sending the last packet */
bbufcnt, /* array index for packet */
firstchar, /* first character in protocol transaction */
bufsize, /* packet size (128 or 1024) */
sendresp; /* response char received from remote */
char *cp = data;
bufsize = x->one_kb ? 1024 : 128;
sendfin = FALSE;
attempts = 0;
if (!x->got_ack) { /* sending first packet */
x->crcmode = FALSE; /* Receiver determines use of crc or checksum */
x->sectnum = 1;
do {
/* wait for and read startup character */
while (
(firstchar = readbyte(x->fd, 30)) != NAK
&& firstchar != CRCCHR
&& firstchar != CAN
) {
if (++attempts > NAKMAX) {
if (emsg) strcpy(emsg,
"XMODEM: remote system not responding");
x->failed = 1;
return 0;
}
}
if ((firstchar & 0x7f) == CAN) {
TRACE("CAN");
if (readbyte(x->fd, 3) == CAN) {
if (emsg) sprintf(emsg, "XMODEM: canceled by user");
x->failed = 1;
return 0;
}
}
if (firstchar == CRCCHR) {
x->crcmode = TRUE;
TRACE("CRC mode requested");
}
} while (firstchar != NAK && firstchar != CRCCHR);
}
if (len == 0) goto sendeot;
bbufcnt = 0; /* start building buf to be sent */
x->buf[bbufcnt++] = (bufsize == 1024) ? STX : SOH;
x->buf[bbufcnt++] = x->sectnum; /* current sector # */
x->buf[bbufcnt++] = ~x->sectnum; /* and its complement */
checksum = 0;
for (bufctr=0; bufctr < bufsize; bufctr++) {
if (bufctr >= len) {
sendfin = TRUE; /* this is the last sector */
x->buf[bbufcnt + bufctr] = CTRLZ; /* Control-Z for CP/M EOF */
} else {
x->buf[bbufcnt + bufctr] = *cp++;
}
if (x->crcmode) {
checksum = (checksum<<B) ^ crctab[(checksum>>(W-B)) ^ x->buf[bbufcnt + bufctr]];
} else {
checksum = ((checksum + x->buf[bbufcnt + bufctr]) & 0xff);
}
}
bbufcnt += bufsize;
if (x->crcmode) { /* put in CRC */
checksum &= 0xffff;
x->buf[bbufcnt++] = ((checksum >> 8) & 0xff);
x->buf[bbufcnt++] = (checksum & 0xff);
} else { /* put in checksum */
x->buf[bbufcnt++] = checksum;
}
attempts = 0;
do { /* inner packet loop */
TRACE("XMODEM write (%d bytes) ", bbufcnt);
//write(x->fd.wr, x->buf, bbufcnt); /* write the buf */
x->fd.handle++; /* increase data handle var for capi */
capi2_datab3_req( x->fd.wr, x->fd.ident, x->buf, bbufcnt, 0, x->fd.handle);
TRACE("%s: sectcurr=0x%02x", x->buf[0]==SOH ? "SOH":"STX", x->sectnum);
#if 0
TRACE("%d byte %02xh (%02xh) sent, checksum %02xh %02xh secnum %d\n",
bbufcnt, x->buf[1]&0xff, x->buf[2]&0xff, x->buf[bufsize+3]&0xff,
x->buf[bufsize+4]&0xff, x->sectnum
);
#endif
attempts++;
sendresp = readbyte(x->fd, 10); /* get response from remote */
if (sendresp != ACK) {
x->errors++;
if ((sendresp & 0x7f) == CAN) {
TRACE("CAN");
if ((readbyte(x->fd, 3) & 0x7f) == CAN) {
if (emsg) strcpy(emsg, "XMODEM: canceled by user");
x->failed = 1;
return 0;
}
}
if (sendresp == TIMEOUT) {
TRACE("timeout on sector %d", x->sentsectcnt);
} else {
TRACE("non-ACK on sector %d", x->sentsectcnt);
}
} else {
x->got_ack = 1;
}
} while (
sendresp != ACK && attempts < RETRYMAX && x->errors < ERRORMAX
);
x->sectnum++;
x->sentsectcnt += (bufsize == 128) ? 1 : 8;
if (attempts >= RETRYMAX) {
sendbyte(x->fd, CAN); sendbyte(x->fd, CAN); sendbyte(x->fd, CAN);
if (emsg) strcpy(emsg, "XMODEM: remote system not responding");
x->failed = 1;
return 0;
}
if (attempts > ERRORMAX) {
sendbyte(x->fd, CAN); sendbyte(x->fd, CAN); sendbyte(x->fd, CAN);
if (emsg) strcpy(emsg, "XMODEM: too many errors");
x->failed = 1;
return 0;
}
if (sendfin) {
sendeot:
attempts = 0;
sendbyte(x->fd, EOT); /* send 1st EOT to close down transfer */
/* wait for ACK of EOT */
while (readbyte(x->fd, 15) != ACK && attempts++ < RETRYMAX) {
TRACE("EOT not acked");
sendbyte(x->fd, EOT);
}
if (attempts >= RETRYMAX) {
if (emsg) strcpy(emsg, "XMODEM: last ACK missing");
x->failed = 1;
return 0;
}
}
return 1;
}
#endif
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