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This is the origin of those # mysterious ports 620, 655, and 707 above. I still don't understand # the meaning of raw port 1. # part 1: scan through the /proc filesystem building up # a list of what processes own what network "inodes". # result is associative array %sock_proc. opendir (PROC, "/proc") || die "proc"; for $f (readdir(PROC)) { next if (! ($f=~/[0-9]+/) ); if (! opendir (PORTS, "/proc/$f/fd")) { # print "failed opendir on process $f fds\n"; closedir PORTS; next; } for $g (readdir(PORTS)) { next if (! ($g=~/[0-9]+/) ); $r=readlink("/proc/$f/fd/$g"); # 2.0.33: [dev]:ino # ($dev,$ino)=($r=~/^\[([0-9a-fA-F]*)\]:([0-9]*)$/); # 2.0.78: socket:[ino] # ($dev,$ino)=($r=~/^(socket):\[([0-9]*)\]$/); # -svm- ($dev,$ino)=($r=~/^(socket|\[[0-9a-fA-F]*\]):\[?([0-9]*)\]?$/); # print "$f $g $r DEV=$dev INO=$ino\n"; if ($dev == "[0000]" || $dev == "socket") {$sock_proc{$ino}=$f.":".$g;} } closedir PORTS; } closedir PROC; # exit; # for $a (keys(%sock_proc)) {print "$a $sock_proc{$a}\n";} # part 2: read /proc/net/tcp, /proc/net/udp, and /proc/net/raw, # printing the answers as we go. print "type port inode uid pid fd name\n"; sub scheck { open(FILE,"/proc/net/".$_[0]) || die; while () { @F=split(); next if ($F[9]=~/uid/); @A=split(":",$F[1]); $a=hex($A[1]); ($pid,$fd)=($sock_proc{$F[9]}=~m.([0-9]*):([0-9]*).); $cmd = ""; if ($pid && open (CMD,"/proc/$pid/status")) { $l = ; ($cmd) = ( $l=~/Name:\s*(\S+)/ ); close(CMD); } printf "%-4s%6d %10d %6d %6d %4d %s\n", $_[0], $a ,$F[9], $F[7], $pid, $fd, $cmd; } close(FILE); } scheck("tcp"); scheck("tcp6"); scheck("udp"); scheck("udp6"); scheck("raw"); scheck("raw6");