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#!/usr/bin/env ruby # coding: utf-8 # vim: set sw=2 sts=2 et nowrap fenc=utf-8 : require 'socket' require 'PinkTrace' PF_INET6 = (PinkTrace::HAVE_IPV6 and Socket.const_defined? 'AF_INET6') ? Socket::AF_INET6 : -999 PF_NETLINK = (PinkTrace::HAVE_NETLINK and Socket.const_defined? 'AF_NETLINK') ? Socket::AF_NETLINK : -9999 def print_ret pid ret = PinkTrace::Syscall.get_ret pid if ret >= 0 print "= #{ret}" else print "= #{ret} #{Errno.constants[-ret]}" end end def decode_open pid, bitness path = PinkTrace::String.decode pid, 0, -1, bitness flags = PinkTrace::Syscall.get_arg pid, 1, bitness print "open(\"#{path}\", #{flags})" end def decode_execve pid, bitness path = PinkTrace::String.decode pid, 0, -1, bitness addr = PinkTrace::Syscall.get_arg pid, 1, bitness print "execve(\"#{path}\", [" i = 0 sep = '' loop do path = PinkTrace::StringArray.decode pid, addr, i if path print "#{sep}\"#{path}\"" i += 1 sep = ', ' else print '], envp[]' break end end end def decode_socketcall pid, bitness, scname subname = nil if PinkTrace::Socket.has_socketcall? bitness subcall = PinkTrace::Socket.decode_call pid, bitness subname = PinkTrace::Socket.name subcall unless subname =~ /(bind|connect)/ print subname + '()' return end end addr, fd = PinkTrace::Socket.decode_address_fd pid, 1, bitness print (subname ? subname : scname) + '(' + fd.to_s + ', ' case addr.family when -1 print 'NULL' when Socket::AF_UNIX print '{sa_family=AF_UNIX, path=' + (addr.abstract? ? '@' + addr.path : addr.path) + '}' when Socket::AF_INET print '{sa_family=AF_INET, sin_port=htons(' + addr.port.to_s + '), sin_addr=inet("' + addr.ip + '")}' when PF_INET6 print '{sa_family=AF_INET6, sin6_port=htons(' + addr.port.to_s + '), inet_pton(AF_INET6, "' + addr.ipv6 + ', &sin6_addr)}' when PF_NETLINK print '{sa_family=AF_NETLINK, pid=' + addr.port.to_s + ', groups=' + sprintf('%08x', addr.groups) + '}' else print '{sa_family=???}' end print ', ' + addr.length.to_s end unless ARGV.size > 0 puts "Usage: #{$0} program [arguments..]" exit 1 end pid = fork do PinkTrace::Trace.me Process.kill 'STOP', Process.pid exec(*ARGV) end Process.waitpid pid PinkTrace::Trace.setup pid, (PinkTrace::Trace::OPTION_SYSGOOD | PinkTrace::Trace::OPTION_EXEC) # Figure out the bitness of the child. bitness = PinkTrace::Bitness.get pid puts "Child #{pid} runs in #{PinkTrace::Bitness.name bitness} mode" dead = false insyscall = false sig = 0 exit_code = 0 loop do # At this point the traced child is stopped and needs to be resumed. PinkTrace::Trace.syscall pid, sig sig = 0 Process.waitpid pid # Check the event, if no argument is given PinkTrace::Event.decide uses # $?.status and Process.waitpid sets $?. event = PinkTrace::Event.decide case event when PinkTrace::Event::EVENT_SYSCALL # We get this event twice, one at entering a system call and one at # exiting a system call. if insyscall print ' ' print_ret pid puts else # Get the system call number and call the appropriate decoder. scno = PinkTrace::Syscall.get_no pid scname = PinkTrace::Syscall.name scno case scname when nil then print "#{scno}()" when 'open' then decode_open pid, bitness when 'execve' then decode_execve pid, bitness when 'socketcall' when 'bind' when 'connect' then decode_socketcall pid, bitness, scname else print "#{scname}()" end end insyscall = (not insyscall) when PinkTrace::Event::EVENT_EXEC # Update bitness bitness = PinkTrace::Bitness.get pid when PinkTrace::Event::EVENT_GENUINE when PinkTrace::Event::EVENT_UNKNOWN # Send the signal to the traced child as it was a genuine signal. sig = $?.stopsig when PinkTrace::Event::EVENT_EXIT_GENUINE exit_code = $?.exitstatus puts "Child #{pid} exited normally with return code #{exit_code}" dead = true when PinkTrace::Event::EVENT_EXIT_SIGNAL exit_code = 128 + $?.termsig puts "Child #{pid} exited with signal #{$?.termsig}" dead = true end break if dead end