* Mnemonic: SIestablish
* Abstract:i Prep functions that set up a socket for listening or making a
* connection.
-* Date: 26 March 1995
-* Author: E. Scott Daniels
+* Date: 26 March 1995
+* Author: E. Scott Daniels
*
-* Modified: 19 Apr 1995 - To keep returned address of the port.
+* Modified: 19 Apr 1995 - To keep returned address of the port.
* 08 Mar 2007 - conversion for ipv6.
* 12 Oct 2020 - split into connect prep and listen prep
* functions.
*/
-#include "sisetup.h" // include the necessary setup stuff
+#include "sisetup.h" // include the necessary setup stuff
#include "sitransport.h"
#include <errno.h>
#include <netinet/tcp.h>
Returns a transport struct which is the main context for the listener.
*/
extern struct tp_blk *SIlisten_prep( struct ginfo_blk *gptr, int type, char* abuf, int family ) {
- struct tp_blk *tptr; // pointer at new tp block
- int status = SI_OK; // processing status
- struct sockaddr *addr; // IP address we are requesting
- int protocol; // protocol for socket call
- char buf[256]; // buffer to build request address in
+ struct tp_blk *tptr; // pointer at new tp block
+ int status = SI_OK; // processing status
+ struct sockaddr *addr; // IP address we are requesting
+ int protocol; // protocol for socket call
+ char buf[256]; // buffer to build request address in
int optval = 0;
int alen = 0;
- tptr = (struct tp_blk *) SInew( TP_BLK ); // new transport info block
+ tptr = (struct tp_blk *) SInew( TP_BLK ); // new transport info block
if( tptr != NULL )
{
addr = NULL;
- switch( type ) // things specifc to tcp or udp
+ switch( type ) // things specifc to tcp or udp
{
case UDP_DEVICE:
tptr->type = SOCK_DGRAM;
protocol = IPPROTO_TCP;
}
- alen = SIgenaddr( abuf, protocol, family, tptr->type, &addr ); // family == 0 for type that suits the address passed in
+ alen = SIgenaddr( abuf, protocol, family, tptr->type, &addr ); // family == 0 for type that suits the address passed in
if( alen <= 0 ) {
return NULL;
}
status = BIND( tptr->fd, (struct sockaddr *) addr, alen );
if( status == SI_OK ) {
- tptr->addr = addr; // save address
+ tptr->addr = addr; // save address
} else {
- fprintf( stderr, ">>>>> siestablish: bind failed: fam=%d type=%d pro=%d %s\n", tptr->family, tptr->type, protocol, strerror( errno ) );
+ fprintf( stderr, "<ERR> siestablish: bind failed: fam=%d type=%d pro=%d %s\n", tptr->family, tptr->type, protocol, strerror( errno ) );
close( tptr->fd );
}
} else {
- status = ! SI_OK; // force bad return later
- fprintf( stderr, ">>>>> siestablish: socket not esablished: fam=%d type=%d pro=%d %s\n", tptr->family, tptr->type, protocol, strerror( errno ) );
+ status = ! SI_OK; // force bad return later
+ fprintf( stderr, "<ERR> siestablish: socket not esablished: fam=%d type=%d pro=%d %s\n", tptr->family, tptr->type, protocol, strerror( errno ) );
}
- if( status != SI_OK ) { // socket or bind call failed - clean up stuff
- fprintf( stderr, ">>>>> siestablish: bad state -- returning nil pointer\n" );
+ if( status != SI_OK ) { // socket or bind call failed - clean up stuff
+ fprintf( stderr, "<ERR> siestablish: bad state -- returning nil pointer\n" );
free( addr );
- SItrash( TP_BLK, tptr ); // free the trasnsport block
- tptr = NULL; // set to return nothing
+ SItrash( TP_BLK, tptr ); // free the trasnsport block
+ tptr = NULL; // set to return nothing
}
}
return tptr;
}
+/*
+ Look at the address and determine if the connect attempt to this address must
+ use safe_connect() rather than the system connect() call. On linux, a smart
+ connect is needed if the target port is >32K and is even. This makes the assumption
+ that the local port rage floor is 32K; we could read something in /proc, but
+ at this point won't bother. Returns true if we determine that it is best to
+ use safe_connect().
+*/
+static int need_smartc( char* abuf ) {
+ char* tok;
+ int state = 1;
+ int v;
+
+ if( (tok = strchr( abuf, ':')) != NULL ) {
+ v = atoi( tok+1 );
+ if( v < 32767 || v % 2 != 0 ) {
+ state = 0;
+ }
+ }
+
+ return state;
+}
+
/*
Prep a socket to use to connect to a listener.
Establish a transport block and target address in prep to connect.
family of 0 (AF_ANY) is usually the best choice.
*/
extern struct tp_blk *SIconn_prep( struct ginfo_blk *gptr, int type, char *abuf, int family ) {
- struct tp_blk *tptr; // pointer at new tp block
- struct sockaddr *addr; // IP address we are requesting
- int protocol; // protocol for socket call
- char buf[256]; // buffer to build request address in
+ struct tp_blk *tptr; // pointer at new tp block
+ struct sockaddr *addr; // IP address we are requesting
+ int protocol; // protocol for socket call
+ char buf[256]; // buffer to build request address in
int optval = 0;
int alen = 0;
- tptr = (struct tp_blk *) SInew( TP_BLK ); // new transport info block
+ tptr = (struct tp_blk *) SInew( TP_BLK ); // new transport info block
if( tptr != NULL )
{
addr = NULL;
- switch( type ) // things specifc to tcp or udp
+ switch( type ) // things specifc to tcp or udp
{
case UDP_DEVICE:
tptr->type = SOCK_DGRAM;
protocol = IPPROTO_TCP;
}
- alen = SIgenaddr( abuf, protocol, family, tptr->type, &addr ); // family == 0 for type that suits the address passed in
- if( alen <= 0 )
- {
- //fprintf( stderr, ">>>>> siconn_prep: error generating an address struct for %s(abuf) %d(proto) %d(type): %s\n",
- // abuf, protocol, tptr->type, strerror( errno ) );
+ alen = SIgenaddr( abuf, protocol, family, tptr->type, &addr ); // family == 0 for type that suits the address passed in
+ if( alen <= 0 ) {
return NULL;
}
if( (tptr->fd = SOCKET( tptr->family, tptr->type, protocol )) >= SI_OK ) {
optval = 1;
- if( SO_REUSEPORT ) {
- SETSOCKOPT( tptr->fd, SOL_SOCKET, SO_REUSEPORT, (char *)&optval, sizeof( optval) );
- }
-
if( gptr->tcp_flags & SI_TF_NODELAY ) {
optval = 1;
} else {
optval = 0;
}
- //fprintf( stderr, ">>>>> conn_prep: setting no delay = %d\n", optval );
SETSOCKOPT( tptr->fd, SOL_TCP, TCP_NODELAY, (void *)&optval, sizeof( optval) ) ;
if( gptr->tcp_flags & SI_TF_FASTACK ) {
} else {
optval = 0;
}
- //fprintf( stderr, ">>>>> conn_prep: setting quick ack = %d\n", optval );
SETSOCKOPT( tptr->fd, SOL_TCP, TCP_QUICKACK, (void *)&optval, sizeof( optval) ) ;
tptr->paddr = addr; // tuck the remote peer address away
+ if( need_smartc( abuf ) ) {
+ tptr->flags |= TPF_SAFEC;
+ }
} else {
- //fprintf( stderr, ">>>>> conn_prep: bad socket create: %s\n", strerror( errno ) );
free( addr );
- SItrash( TP_BLK, tptr ); // free the trasnsport block
+ SItrash( TP_BLK, tptr ); // free the trasnsport block
tptr = NULL; // we'll return nil
}
}
Code Review / ric-plt / lib / rmr.git / blobdiff