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Operating Systems Solaris getpeername: Transport endpoint is not connected Post 302731739 by DGPickett on Thursday 15th of November 2012 05:10:15 PM
Old 11-15-2012
Here is the packet by packet: A client sends a TCP syn bit packet from his socket to a listening socket on a server. The server sends a syn-ack packet back and sets up a connection filter to divert this clients packets to a child socket that is now considered possible 'connected' to the client, so the listener just gets new connection packets. Middle packets are just ack packets, as I recall. When idle, keep-alive packets are sent, to ensure timers do not expire saying there is a disconnect. Sometimes routers delete and fake these to reduce traffic! Either end could send a fin packet to close it, and expects a fin-ack packet back in response. If a code bit gets a stale socket, and asks for the peer name (remote ip and port), while the information is probably available, the fact that the connection is closed is deemed a more appropriate response -- no point beating a dead horse, as it were.

Last edited by DGPickett; 11-15-2012 at 06:47 PM..
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ashunt(8)							netsniff-ng-toolkit							 ashunt(8)

NAME
ashunt - Autonomous System (AS) trace route utility SYNOPSIS
ashunt -H|--host <host> -i|-d|--dev <dev> [-6|--ipv6] [-n|--numeric] [-N|--dns] [-f|--init-ttl <ttl>] [-m|--max-ttl <ttl>] [-q|--num-probes] [-x|--timeout <sec>] [-S|--syn] [-A|--ack] [-F|--fin] [-P|--psh] [-U|--urg] [-R|--rst] [-E|--ecn-syn] [-t|--tos <tos>] [-G|--nofrag] [-X|--payload <string>] [-Z|--show-packet] [-l|--totlen <len>] [-w|--whois <server>] [-W|--wport <port>] [--city-db <path>] [--country-db <path>] [-v|--version] [-h|--help] DESCRIPTION
This program provides AS information on each hop between the client and the target host. OPTIONS
ashunt -i eth0 -N -E -H netsniff-ng.org IPv4 trace of AS with TCP ECN SYN probe ashunt -i eth0 -N -S -H netsniff-ng.org IPv4 trace of AS with TCP SYN probe ashunt -i eth0 -N -F -H netsniff-ng.org IPv4 trace of AS with TCP FIN probe ashunt -i eth0 -N -FPU -H netsniff-ng.org IPv4 trace of AS with Xmas probe ashunt -i eth0 -N -H netsniff-ng.org -X "censor-me" -Z IPv4 trace of AS with Null probe with ASCII payload ashunt -6 -S -i eth0 -H netsniff-ng.org IPv6 trace of AS up to netsniff-ng.org OPTIONS
-h|--help Print help text and lists all options. -v|--version Print version. -H|--host <host> Host/IPv4/IPv6 to lookup AS route to i-|-d|--dev <netdev> Networking device, i.e. eth0 -p|--port <port> Hosts port to lookup AS route to -4|--ipv4 Use IPv4 requests (default) -6|--ipv6 Use IPv6 requests -n|--numeric Do not do reverse DNS lookup for hops -N|--dns Do a reverse DNS lookup for hops -f|--init-ttl <ttl> Set initial TTL -m|--max-ttl <ttl> Set maximum TTL (default: 30) -q|--num-probes <num> Number of max probes for each hop (default: 3) -x|--timeout <sec> Probe response timeout in sec (default: 3) -S|--syn Set TCP SYN flag in packets -A|--ack Set TCP ACK flag in packets -F|--fin Set TCP FIN flag in packets -P|--psh Set TCP PSH flag in packets -U|--urg Set TCP URG flag in packets -R|--rst Set TCP RST flag in packets -E|--ecn-syn Send ECN SYN packets (RFC3168) -t|--tos <tos> Set the IP TOS field -w|--whois <server> Use a different AS whois DB server (default: /etc/netsniff-ng/whois.conf) -W|--wport <port> Use a different port to AS whois server (default: /etc/netsniff-ng/whois.conf) --city-db <path> Specifiy path for geoip city database --country-db <path> Specifiy path for geoip country database AUTHOR
Written by Daniel Borkmann <daniel@netsniff-ng.org> DOCUMENTATION
Documentation by Emmanuel Roullit <emmanuel@netsniff-ng.org> BUGS
Please report bugs to <bugs@netsniff-ng.org> 2012-06-29 ashunt(8)
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