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[tcp] Randomise local TCP port 

Signed-off-by: Guo-Fu Tseng <cooldavid@cooldavid.org>
Modified-by: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/1/head
Guo-Fu Tseng 2010-07-13 17:24:01 +01:00 committed by Michael Brown
parent 73e3672468
commit 1e7e4c9a61
1 changed files with 5 additions and 3 deletions
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8
src/net/tcp.c
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@ -174,11 +174,13 @@ tcp_dump_flags ( struct tcp_connection *tcp, unsigned int flags ) {
*/ */
static int tcp_bind ( struct tcp_connection *tcp, unsigned int port ) { static int tcp_bind ( struct tcp_connection *tcp, unsigned int port ) {
struct tcp_connection *existing; struct tcp_connection *existing;
static uint16_t try_port = 1023; uint16_t try_port;
unsigned int i;
/* If no port specified, find the first available port */ /* If no port is specified, find an available port */
if ( ! port ) { if ( ! port ) {
while ( try_port ) { try_port = random();
for ( i = 0 ; i < 65536 ; i++ ) {
try_port++; try_port++;
if ( try_port < 1024 ) if ( try_port < 1024 )
continue; continue;