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tcp_dos.c
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C/C++ Source or Header
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1996-03-15
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11KB
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386 lines
/*
* Program: MS-DOS TCP/IP routines
*
* Author: Mark Crispin
* Networks and Distributed Computing
* Computing & Communications
* University of Washington
* Administration Building, AG-44
* Seattle, WA 98195
* Internet: MRC@CAC.Washington.EDU
*
* Date: 11 April 1989
* Last Edited: 8 September 1995
*
* Copyright 1995 by the University of Washington
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose and without fee is hereby granted, provided
* that the above copyright notice appears in all copies and that both the
* above copyright notice and this permission notice appear in supporting
* documentation, and that the name of the University of Washington not be
* used in advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. This software is made
* available "as is", and
* THE UNIVERSITY OF WASHINGTON DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED,
* WITH REGARD TO THIS SOFTWARE, INCLUDING WITHOUT LIMITATION ALL IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND IN
* NO EVENT SHALL THE UNIVERSITY OF WASHINGTON BE LIABLE FOR ANY SPECIAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, TORT
* (INCLUDING NEGLIGENCE) OR STRICT LIABILITY, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
/* TCP timeout handler routine */
static tcptimeout_t tcptimeout = NIL;
/* TCP timeouts, in seconds */
static long tcptimeout_read = 0;
static long tcptimeout_write = 0;
/* TCP/IP manipulate parameters
* Accepts: function code
* function-dependent value
* Returns: function-dependent return value
*/
void *tcp_parameters (long function,void *value)
{
switch ((int) function) {
case SET_TIMEOUT:
tcptimeout = (tcptimeout_t) value;
break;
case GET_TIMEOUT:
value = (void *) tcptimeout;
break;
case SET_READTIMEOUT:
tcptimeout_read = (long) value;
break;
case GET_READTIMEOUT:
value = (void *) tcptimeout_read;
break;
case SET_WRITETIMEOUT:
tcptimeout_write = (long) value;
break;
case GET_WRITETIMEOUT:
value = (void *) tcptimeout_write;
break;
default:
value = NIL; /* error case */
break;
}
return value;
}
/* TCP/IP open
* Accepts: host name
* contact service name
* contact port number
* Returns: TCP/IP stream if success else NIL
*/
TCPSTREAM *tcp_open (char *host,char *service,long port)
{
TCPSTREAM *stream = NIL;
struct sockaddr_in sin;
int sock;
char *s,tmp[MAILTMPLEN];
if (s = strchr (host,':')) { /* port number specified? */
*s++ = '\0'; /* yes, tie off port */
port = strtol (s,&s,10); /* parse port */
if (s && *s) {
sprintf (tmp,"Junk after port number: %.80s",s);
mm_log (tmp,ERROR);
return NIL;
}
}
/* The domain literal form is used (rather than simply the dotted decimal
as with other Unix programs) because it has to be a valid "host name"
in mailsystem terminology. */
sin.sin_family = AF_INET; /* family is always Internet */
/* look like domain literal? */
if (host[0] == '[' && host[(strlen (host))-1] == ']') {
strcpy (tmp,host+1); /* yes, copy number part */
tmp[strlen (tmp)-1] = '\0';
if ((sin.sin_addr.s_addr = inet_addr (tmp)) == -1) {
sprintf (tmp,"Bad format domain-literal: %.80s",host);
mm_log (tmp,ERROR);
return NIL;
}
}
/* look up host name */
else if (!lookuphost (&host,&sin)) {
sprintf (tmp,"Host not found: %s",host);
mm_log (tmp,ERROR);
return NIL;
}
/* copy port number in network format */
if (!(sin.sin_port = htons (port))) fatal ("Bad port argument to tcp_open");
/* get a TCP stream */
if ((sock = socket (sin.sin_family,SOCK_STREAM,0)) < 0) {
sprintf (tmp,"Unable to create TCP socket (%d)",errno);
mm_log (tmp,ERROR);
fs_give ((void **) &host);
return NIL;
}
/* open connection */
if (connect (sock,(struct sockaddr *) &sin,sizeof (sin)) < 0) {
switch (errno) { /* analyze error */
case ECONNREFUSED:
s = "Refused";
break;
case ENOBUFS:
s = "Insufficient system resources";
break;
case ETIMEDOUT:
s = "Timed out";
break;
default:
s = "Unknown error";
break;
}
sprintf (tmp,"Can't connect to %.80s,%ld: %s (%d)",host,port,s,errno);
mm_log (tmp,ERROR);
close (sock);
fs_give ((void **) &host);
return NIL;
}
/* create TCP/IP stream */
stream = (TCPSTREAM *) fs_get (sizeof (TCPSTREAM));
stream->host = host; /* official host name */
stream->localhost = cpystr (mylocalhost ());
stream->port = port; /* port number */
stream->tcps = sock; /* init socket */
stream->ictr = 0; /* init input counter */
return stream; /* return success */
}
/* TCP/IP authenticated open
* Accepts: host name
* service name
* returned user name
* Returns: TCP/IP stream if success else NIL
*/
TCPSTREAM *tcp_aopen (char *host,char *service,char *usrnam)
{
return NIL; /* always NIL on DOS */
}
/* TCP/IP receive line
* Accepts: TCP/IP stream
* Returns: text line string or NIL if failure
*/
char *tcp_getline (TCPSTREAM *stream)
{
int n,m;
char *st,*ret,*stp;
char c = '\0';
char d;
/* make sure have data */
if (!tcp_getdata (stream)) return NIL;
st = stream->iptr; /* save start of string */
n = 0; /* init string count */
while (stream->ictr--) { /* look for end of line */
d = *stream->iptr++; /* slurp another character */
if ((c == '\015') && (d == '\012')) {
ret = (char *) fs_get (n--);
memcpy (ret,st,n); /* copy into a free storage string */
ret[n] = '\0'; /* tie off string with null */
return ret;
}
n++; /* count another character searched */
c = d; /* remember previous character */
}
/* copy partial string from buffer */
memcpy ((ret = stp = (char *) fs_get (n)),st,n);
/* get more data from the net */
if (!tcp_getdata (stream)) return NIL;
/* special case of newline broken by buffer */
if ((c == '\015') && (*stream->iptr == '\012')) {
stream->iptr++; /* eat the line feed */
stream->ictr--;
ret[n - 1] = '\0'; /* tie off string with null */
}
/* else recurse to get remainder */
else if (st = tcp_getline (stream)) {
ret = (char *) fs_get (n + 1 + (m = strlen (st)));
memcpy (ret,stp,n); /* copy first part */
memcpy (ret + n,st,m); /* and second part */
fs_give ((void **) &stp); /* flush first part */
fs_give ((void **) &st); /* flush second part */
ret[n + m] = '\0'; /* tie off string with null */
}
return ret;
}
/* TCP/IP receive buffer
* Accepts: TCP/IP stream
* size in bytes
* buffer to read into
* Returns: T if success, NIL otherwise
*/
long tcp_getbuffer (TCPSTREAM *stream,unsigned long size,char *buffer)
{
unsigned long n;
char *bufptr = buffer;
while (size > 0) { /* until request satisfied */
if (!tcp_getdata (stream)) return NIL;
n = min (size,stream->ictr);/* number of bytes to transfer */
/* do the copy */
memcpy (bufptr,stream->iptr,n);
bufptr += n; /* update pointer */
stream->iptr +=n;
size -= n; /* update # of bytes to do */
stream->ictr -=n;
}
bufptr[0] = '\0'; /* tie off string */
return T;
}
/* TCP/IP receive data
* Accepts: TCP/IP stream
* Returns: T if success, NIL otherwise
*/
long tcp_getdata (TCPSTREAM *stream)
{
int i;
fd_set fds,efds;
struct timeval tmo;
time_t t = time (0);
tmo.tv_sec = tcptimeout_read;
tmo.tv_usec = 0;
FD_ZERO (&fds); /* initialize selection vector */
FD_ZERO (&efds); /* handle errors too */
if (stream->tcps < 0) return NIL;
while (stream->ictr < 1) { /* if nothing in the buffer */
FD_SET (stream->tcps,&fds); /* set bit in selection vector */
FD_SET (stream->tcps,&efds);/* set bit in selection vector */
errno = NIL; /* block and read */
while (((i = select (stream->tcps+1,&fds,0,&efds,
tmo.tv_sec ? &tmo : (struct timeval *) 0)) < 0) &&
(errno == EINTR));
if (!i) { /* timeout? */
if (tcptimeout && ((*tcptimeout) (time (0) - t))) continue;
else return tcp_abort (stream);
}
if (i < 0) return tcp_abort (stream);
while (((i = read (stream->tcps,stream->ibuf,BUFLEN)) < 0) &&
(errno == EINTR));
if (i < 1) return tcp_abort (stream);
stream->iptr = stream->ibuf;
stream->ictr = i; /* set new byte pointer and count */
}
return T;
}
/* TCP/IP send string as record
* Accepts: TCP/IP stream
* string pointer
* Returns: T if success else NIL
*/
long tcp_soutr (TCPSTREAM *stream,char *string)
{
return tcp_sout (stream,string,(unsigned long) strlen (string));
}
/* TCP/IP send string
* Accepts: TCP/IP stream
* string pointer
* byte count
* Returns: T if success else NIL
*/
long tcp_sout (TCPSTREAM *stream,char *string,unsigned long size)
{
long i;
struct timeval tmo;
fd_set fds;
time_t t = time (0);
tmo.tv_sec = tcptimeout_write;
tmo.tv_usec = 0;
FD_ZERO (&fds); /* initialize selection vector */
if (stream->tcps < 0) return NIL;
while (size > 0) { /* until request satisfied */
FD_SET (stream->tcps,&fds); /* set bit in selection vector */
/* block and write */
if (((i = select (stream->tcps+1,0,&fds,0,
tmo.tv_sec ? &tmo : (struct timeval *) 0)) > 0) &&
((i = write (stream->tcps,string,size)) >= 0)) {
size -= i; /* count this size */
string += i;
}
/* error or timeout */
else if (i || !(tcptimeout && ((*tcptimeout) (time (0) - t))))
return tcp_abort (stream);
}
return T; /* all done */
}
/* TCP/IP close
* Accepts: TCP/IP stream
*/
void tcp_close (TCPSTREAM *stream)
{
tcp_abort (stream); /* nuke the socket */
/* flush host names */
fs_give ((void **) &stream->host);
fs_give ((void **) &stream->localhost);
fs_give ((void **) &stream); /* flush the stream */
}
/* TCP/IP abort stream
* Accepts: TCP/IP stream
* Returns: NIL always
*/
long tcp_abort (TCPSTREAM *stream)
{
if (stream->tcps >= 0) close (stream->tcps);
stream->tcps = -1;
return NIL;
}
/* TCP/IP get host name
* Accepts: TCP/IP stream
* Returns: host name for this stream
*/
char *tcp_host (TCPSTREAM *stream)
{
return stream->host; /* return host name */
}
/* TCP/IP return port for this stream
* Accepts: TCP/IP stream
* Returns: port number for this stream
*/
long tcp_port (TCPSTREAM *stream)
{
return stream->port; /* return port number */
}
/* TCP/IP get local host name
* Accepts: TCP/IP stream
* Returns: local host name
*/
char *tcp_localhost (TCPSTREAM *stream)
{
return stream->localhost; /* return local host name */
}