Get the current TCP/UDP conenction status

amit.saha · 06-22-2006, 07:49 AM

How can i get the current state of the TCP connection ( ESTABLISHED,SYN_WAIT, etc) thorugh C?

prozac · 06-23-2006, 12:49 AM

through C?

gilead · 06-23-2006, 01:46 AM

Have you looked at iptstate at http://www.phildev.net/iptstate/? It might give you some useful information.

nx5000 · 06-23-2006, 01:57 AM

One method is to use procfs :

Open /proc/net/tcp and sscanf on it.
The first line is the header, st being the state, local_address is of the form ip_in_hex:port_in_hex.

ESTABLISHED=1
SYN_SENT=2
SYN_RECV=3
FIN_WAIT1=4
FIN_WAIT2=5
TIME_WAIT=6
CLOSE=7
CLOSE_WAIT=8
LAST_ACK=9
LISTEN=10
CLOSING=11

Should be sufficient..