Viewing file:  tcp_dwa.c (8.88 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/* ========================================================================
* Copyright 1988-2008 University of Washington
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
*
* ========================================================================
*/
/*
* Program: Waterloo 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: 13 January 2008
*/
/* Global data */
short sock_initted = 0; /* global so others using net can see it */
static char *tcp_getline_work (TCPSTREAM *stream,unsigned long *size,
long *contd);
/* TCP/IP manipulate parameters
* Accepts: function code
* function-dependent value
* Returns: function-dependent return value
*/
void *tcp_parameters (long function,void *value)
{
return NIL;
}
/* 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,unsigned long port)
{
TCPSTREAM *stream = NIL;
tcp_Socket *sock;
char *s,tmp[MAILTMPLEN];
unsigned long adr,i,j,k,l;
port &= 0xffff; /* erase flags */
/* initialize if first time here */
if (!sock_initted++) sock_init();
/* 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. */
/* look like domain literal? */
if (host[0] == '[' && host[strlen (host)-1] == ']') {
if (((i = strtoul (s = host+1,&s,10)) <= 255) && *s++ == '.' &&
((j = strtoul (s,&s,10)) <= 255) && *s++ == '.' &&
((k = strtoul (s,&s,10)) <= 255) && *s++ == '.' &&
((l = strtoul (s,&s,10)) <= 255) && *s++ == ']' && !*s)
adr = (i << 24) + (j << 16) + (k << 8) + l;
else {
sprintf (tmp,"Bad format domain-literal: %.80s",host);
mm_log (tmp,ERROR);
return NIL;
}
}
else { /* lookup host name */
if (!(adr = resolve (host))) {
sprintf (tmp,"Host not found: %s",host);
mm_log (tmp,ERROR);
return NIL;
}
}
/* OK to instantiate socket now */
sock = (tcp_Socket *) fs_get (sizeof (tcp_Socket));
/* open connection */
if (!tcp_open (sock,(word) 0,adr,(word) port,NULL)) {
sprintf (tmp,"Can't connect to %.80s,%ld",host,port);
mm_log (tmp,ERROR);
fs_give ((void **) &sock);
return NIL;
}
/* create TCP/IP stream */
stream = (TCPSTREAM *) fs_get (sizeof (TCPSTREAM));
stream->host = cpystr (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: NETMBX specifier
* service name
* returned user name buffer
* Returns: TCP/IP stream if success else NIL
*/
TCPSTREAM *tcp_aopen (NETMBX *mb,char *service,char *usrbuf)
{
return NIL; /* always NIL on DOS */
}
/* TCP receive line
* Accepts: TCP stream
* Returns: text line string or NIL if failure
*/
char *tcp_getline (TCPSTREAM *stream)
{
unsigned long n,contd;
char *ret = tcp_getline_work (stream,&n,&contd);
if (ret && contd) { /* got a line needing continuation? */
STRINGLIST *stl = mail_newstringlist ();
STRINGLIST *stc = stl;
do { /* collect additional lines */
stc->text.data = (unsigned char *) ret;
stc->text.size = n;
stc = stc->next = mail_newstringlist ();
ret = tcp_getline_work (stream,&n,&contd);
} while (ret && contd);
if (ret) { /* stash final part of line on list */
stc->text.data = (unsigned char *) ret;
stc->text.size = n;
/* determine how large a buffer we need */
for (n = 0, stc = stl; stc; stc = stc->next) n += stc->text.size;
ret = fs_get (n + 1); /* copy parts into buffer */
for (n = 0, stc = stl; stc; n += stc->text.size, stc = stc->next)
memcpy (ret + n,stc->text.data,stc->text.size);
ret[n] = '\0';
}
mail_free_stringlist (&stl);/* either way, done with list */
}
return ret;
}
/* TCP receive line or partial line
* Accepts: TCP stream
* pointer to return size
* pointer to return continuation flag
* Returns: text line string, size and continuation flag, or NIL if failure
*/
static char *tcp_getline_work (TCPSTREAM *stream,unsigned long *size,
long *contd)
{
unsigned long n;
char *s,*ret,c,d;
*contd = NIL; /* assume no continuation */
/* make sure have data */
if (!tcp_getdata (stream)) return NIL;
for (s = stream->iptr, n = 0, c = '\0'; stream->ictr--; n++, c = d) {
d = *stream->iptr++; /* slurp another character */
if ((c == '\015') && (d == '\012')) {
ret = (char *) fs_get (n--);
memcpy (ret,s,*size = n); /* copy into a free storage string */
ret[n] = '\0'; /* tie off string with null */
return ret;
}
}
/* copy partial string from buffer */
memcpy ((ret = (char *) fs_get (n)),s,*size = n);
/* get more data from the net */
if (!tcp_getdata (stream)) fs_give ((void **) &ret);
/* special case of newline broken by buffer */
else if ((c == '\015') && (*stream->iptr == '\012')) {
stream->iptr++; /* eat the line feed */
stream->ictr--;
ret[*size = --n] = '\0'; /* tie off string with null */
}
else *contd = LONGT; /* continuation needed */
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,(size_t) 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 status;
if (!stream->tcps) return NIL;/* no-no nuked socket */
while (stream->ictr < 1) { /* if buffer empty, block for input and read */
if (!_ip_delay1 (stream->tcps,600,NULL,&status))
stream->ictr = sock_fastread (stream->tcps,
stream->iptr = stream->ibuf,BUFLEN);
else if (status == 1) { /* nuke the socket if closed */
sock_close (stream->tcps);
fs_give ((void **) &stream->tcps);
return NIL;
}
}
return T;
}
/* TCP/IP send string as record
* Accepts: TCP/IP stream
* Returns: T if success else NIL
*/
long tcp_soutr (TCPSTREAM *stream,char *string)
{
/* output the cruft */
sock_puts (stream->tcps,string);
return T; /* all done */
}
/* 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)
{
sock_write (stream->tcps,string,(int) size);
return T;
}
/* TCP/IP close
* Accepts: TCP/IP stream
*/
void tcp_close (TCPSTREAM *stream)
{
if (stream->tcps){ /* nuke the socket */
sock_close (stream->tcps);
_ip_delay2 (stream->tcps,0,NULL,NULL);
}
fs_give ((void **) &stream->tcps);
/* flush host names */
fs_give ((void **) &stream->host);
fs_give ((void **) &stream->localhost);
fs_give ((void **) &stream); /* flush the stream */
}
/* 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 get remote host name
* Accepts: TCP/IP stream
* Returns: host name for this stream
*/
char *tcp_remotehost (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
*/
unsigned 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 */
}
/* TCP/IP return canonical form of host name
* Accepts: host name
* Returns: canonical form of host name
*/
char *tcp_canonical (char *name)
{
return name;
}
/* TCP/IP get client host name (server calls only)
* Returns: client host name
*/
char *tcp_clienthost ()
{
return "UNKNOWN";
}
|