Viewing file:  tcp_vmsm.c (13.17 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: VMS TCP/IP routines for Multinet
*
* 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: 2 August 1994
* Last Edited: 13 January 2008
*/
static tcptimeout_t tmoh = NIL; /* TCP timeout handler routine */
static long ttmo_read = 0; /* TCP timeouts, in seconds */
static long ttmo_write = 0;
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)
{
void *ret = NIL;
switch ((int) function) {
case SET_TIMEOUT:
tmoh = (tcptimeout_t) value;
case GET_TIMEOUT:
ret = (void *) tmoh;
break;
case SET_READTIMEOUT:
ttmo_read = (long) value;
case GET_READTIMEOUT:
ret = (void *) ttmo_read;
break;
case SET_WRITETIMEOUT:
ttmo_write = (long) value;
case GET_WRITETIMEOUT:
ret = (void *) ttmo_write;
break;
}
return ret;
}
/* 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;
int sock;
char *s;
struct sockaddr_in sin;
struct hostent *host_name;
char hostname[MAILTMPLEN];
char tmp[MAILTMPLEN];
struct protoent *pt = getprotobyname ("tcp");
struct servent *sv = NIL;
port &= 0xffff; /* erase flags */
if (service) { /* service specified? */
if (*service == '*') { /* yes, special alt driver kludge? */
sv = getservbyname (service + 1,"tcp");
}
else sv = getservbyname (service,"tcp");
}
/* user service name port */
if (sv) port = ntohs (sin.sin_port = sv->s_port);
/* copy port number in network format */
else sin.sin_port = htons (port);
/* 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] == ']') {
strcpy (hostname,host+1); /* yes, copy number part */
hostname[(strlen (hostname))-1] = '\0';
if ((sin.sin_addr.s_addr = inet_addr (hostname)) != -1) {
sin.sin_family = AF_INET; /* family is always Internet */
strcpy (hostname,host); /* hostname is user's argument */
}
else {
sprintf (tmp,"Bad format domain-literal: %.80s",host);
mm_log (tmp,ERROR);
return NIL;
}
}
else { /* lookup host name, note that brain-dead Unix
requires lowercase! */
strcpy (hostname,host); /* in case host is in write-protected memory */
if ((host_name = gethostbyname (lcase (hostname)))) {
/* copy address type */
sin.sin_family = host_name->h_addrtype;
/* copy host name */
strcpy (hostname,host_name->h_name);
/* copy host addresses */
memcpy (&sin.sin_addr,host_name->h_addr,host_name->h_length);
}
else {
sprintf (tmp,"No such host as %.80s",host);
mm_log (tmp,ERROR);
return NIL;
}
}
/* get a TCP stream */
if ((sock = socket (sin.sin_family,SOCK_STREAM,pt ? pt->p_proto : 0)) < 0) {
sprintf (tmp,"Unable to create TCP socket: %s",strerror (errno));
mm_log (tmp,ERROR);
return NIL;
}
#if 0
/* Maybe this test is necessary. It depends upon how VMS implements
* fd_set. UNIX-style fd_set needs it; Windows-style does not.
*/
else if (sock >= FD_SETSIZE) {/* unselectable sockets are useless */
sprintf (tmp,"Unable to create selectable TCP socket (%d >= %d)",
sock,FD_SETSIZE);
close (sock);
return NIL;
}
#endif
/* open connection */
if (connect (sock,(struct sockaddr *)&sin,sizeof (sin)) < 0) {
sprintf (tmp,"Can't connect to %.80s,%d: %s",hostname,port,
strerror (errno));
mm_log (tmp,ERROR);
return NIL;
}
/* create TCP/IP stream */
stream = (TCPSTREAM *) fs_get (sizeof (TCPSTREAM));
/* copy official host name */
stream->host = cpystr (hostname);
/* get local name */
gethostname (tmp,MAILTMPLEN-1);
stream->localhost = cpystr ((host_name = gethostbyname (tmp)) ?
host_name->h_name : tmp);
/* init sockets */
stream->port = port; /* port number */
stream->tcpsi = stream->tcpso = sock;
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;
}
/* 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,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);
if (stream->tcpsi < 0) return NIL;
while (stream->ictr < 1) { /* if nothing in the buffer */
time_t tl = time (0); /* start of request */
tmo.tv_sec = ttmo_read; /* read timeout */
tmo.tv_usec = 0;
FD_ZERO (&fds); /* initialize selection vector */
FD_ZERO (&efds); /* handle errors too */
FD_SET (stream->tcpsi,&fds);/* set bit in selection vector */
FD_SET(stream->tcpsi,&efds);/* set bit in error selection vector */
errno = NIL; /* block and read */
while (((i = select (getdtablesize (),&fds,0,&efds,ttmo_read ? &tmo:0))<0)
&& (errno == EINTR));
if (!i) { /* timeout? */
time_t tc = time (0);
if (tmoh && ((*tmoh) (tc - t,tc - tl))) continue;
else return tcp_abort (stream);
}
else if (i < 0) return tcp_abort (stream);
while (((i = socket_read (stream->tcpsi,stream->ibuf,BUFLEN)) < 0) &&
(errno == EINTR));
if (i < 1) return tcp_abort (stream);
stream->iptr = stream->ibuf;/* point at TCP buffer */
stream->ictr = i; /* set new byte 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)
{
int i;
fd_set fds;
struct timeval tmo;
time_t t = time (0);
if (stream->tcpso < 0) return NIL;
while (size > 0) { /* until request satisfied */
time_t tl = time (0); /* start of request */
tmo.tv_sec = ttmo_write; /* write timeout */
tmo.tv_usec = 0;
FD_ZERO (&fds); /* initialize selection vector */
FD_SET (stream->tcpso,&fds);/* set bit in selection vector */
errno = NIL; /* block and write */
while (((i = select (getdtablesize (),0,&fds,0,ttmo_write ? &tmo : 0)) < 0)
&& (errno == EINTR));
if (!i) { /* timeout? */
time_t tc = time (0);
if (tmoh && ((*tmoh) (tc - t,tc - tl))) continue;
else return tcp_abort (stream);
}
else if (i < 0) return tcp_abort (stream);
while (((i = socket_write (stream->tcpso,string,size)) < 0) &&
(errno == EINTR));
if (i < 0) return tcp_abort (stream);
size -= i; /* how much we sent */
string += i;
}
return T; /* all done */
}
/* TCP/IP close
* Accepts: TCP/IP stream
*/
void tcp_close (TCPSTREAM *stream)
{
tcp_abort (stream); /* nuke the stream */
/* 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)
{
int i;
if (stream->tcpsi >= 0) { /* no-op if no socket */
/* nuke the socket */
socket_close (stream->tcpsi);
if (stream->tcpsi != stream->tcpso) socket_close (stream->tcpso);
stream->tcpsi = stream->tcpso = -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 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 */
}
/* Return my local host name
* Returns: my local host name
*/
char *mylocalhost ()
{
char tmp[MAILTMPLEN];
struct hostent *hn;
if (!myLocalHost) { /* have local host yet? */
gethostname(tmp,MAILTMPLEN);/* get local host name */
myLocalHost = cpystr ((hn = gethostbyname (tmp)) ? hn->h_name : tmp);
}
return myLocalHost;
}
/* TCP/IP return canonical form of host name
* Accepts: host name
* Returns: canonical form of host name
*/
char *tcp_canonical (char *name)
{
char host[MAILTMPLEN];
struct hostent *he;
/* look like domain literal? */
if (name[0] == '[' && name[strlen (name) - 1] == ']') return name;
/* note that Unix requires lowercase! */
else return (he = gethostbyname (lcase (strcpy (host,name)))) ?
he->h_name : name;
}
/* TCP/IP get client host name (server calls only)
* Returns: client host name
*/
char *tcp_clienthost ()
{
return "UNKNOWN";
}
|