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# encoding: binary
#
# Copyright (c) 2010-2025 Asynchronous B.V.
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

require 'rbconfig'
PhusionPassenger.require_passenger_lib 'vendor/crash_watch/base'
PhusionPassenger.require_passenger_lib 'vendor/crash_watch/utils'

module CrashWatch
  class GdbNotFound < Error
  end

  class GdbBroken < Error
  end

  class GdbController
    class ExitInfo
      attr_reader :exit_code, :signal, :backtrace, :snapshot

      def initialize(exit_code, signal, backtrace, snapshot)
        @exit_code = exit_code
        @signal = signal
        @backtrace = backtrace
        @snapshot = snapshot
      end

      def signaled?
        !!@signal
      end
    end

    END_OF_RESPONSE_MARKER = '--------END_OF_RESPONSE--------'

    attr_accessor :debug

    def initialize
      @pid, @in, @out = Utils.popen_command(find_gdb, "-n", "-q")
      execute("set prompt ")
    end

    def execute(command_string, timeout = nil)
      raise "GDB session is already closed" if !@pid
      puts "gdb write #{command_string.inspect}" if @debug
      @in.puts(command_string)
      @in.puts("echo \\n#{END_OF_RESPONSE_MARKER}\\n")
      done = false
      result = ""
      while !done
        begin
          if select([@out], nil, nil, timeout)
            line = @out.readline
            puts "gdb read #{line.inspect}" if @debug
            if line == "#{END_OF_RESPONSE_MARKER}\n"
              done = true
            else
              result << line
            end
          else
            close!
            done = true
            result = nil
          end
        rescue EOFError
          done = true
        end
      end
      result
    end

    def closed?
      !@pid
    end

    def close
      if !closed?
        begin
          execute("detach", 5)
          execute("quit", 5) if !closed?
        rescue Errno::EPIPE
        end
        if !closed?
          @in.close
          @out.close
          Process.waitpid(@pid)
          @pid = nil
        end
      end
    end

    def close!
      if !closed?
        @in.close
        @out.close
        Process.kill('KILL', @pid)
        Process.waitpid(@pid)
        @pid = nil
      end
    end

    def attach(pid)
      pid = pid.to_s.strip
      raise ArgumentError if pid.empty?
      result = execute("attach #{pid}")
      result !~ /(No such process|Unable to access task|Operation not permitted)/
    end

    def handle_signal(sig)
      execute("handle SIGVTALRM noprint pass")
    end

    def program_counter
      execute("p/x $pc").gsub(/.* = /, '')
    end

    def current_thread
      execute("thread") =~ /Current thread is (.+?) /
      $1
    end

    def current_thread_backtrace
      execute("bt full").strip
    end

    def all_threads_backtraces
      execute("thread apply all bt full").strip
    end

    def wait_until_exit
      execute("break _exit")

      signal = nil
      backtraces = nil
      snapshot = nil

      while true
        result = execute("continue")
        if result =~ /^(Program|Thread .*) received signal (.+?),/
          signal = $2
          backtraces = execute("thread apply all bt full").strip
          if backtraces.empty?
            backtraces = execute("bt full").strip
          end
          snapshot = yield(self) if block_given?

          # This signal may or may not be immediately fatal; the
          # signal might be ignored by the process, or the process
          # has some clever signal handler that fixes the state,
          # or maybe the signal handler must run some cleanup code
          # before killing the process. Let's find out by running
          # the next machine instruction.
          old_program_counter = program_counter
          result = execute("stepi")
          if result =~ /^(Program|Thread .*) received signal .+?,/
            # Yes, it was fatal. Here we don't care whether the
            # instruction caused a different signal. The last
            # one is probably what we're interested in.
            return ExitInfo.new(nil, signal, backtraces, snapshot)
          elsif result =~ /^Program (terminated|exited)/ || result =~ /^Breakpoint .*? (__GI_)?_exit/
            # Running the next instruction causes the program to terminate.
            # Not sure what's going on but the previous signal and
            # backtrace is probably what we're interested in.
            return ExitInfo.new(nil, signal, backtraces, snapshot)
          elsif old_program_counter == program_counter
            # The process cannot continue but we're not sure what GDB
            # is telling us.
            raise "Unexpected GDB output: #{result}"
          end
          # else:
          # The signal doesn't isn't immediately fatal, so save current
          # status, continue, and check whether the process exits later.
        elsif result =~ /^Program terminated with signal (.+?),/
          if $1 == signal
            # Looks like the signal we trapped earlier
            # caused an exit.
            return ExitInfo.new(nil, signal, backtraces, snapshot)
          else
            return ExitInfo.new(nil, signal, nil, snapshot)
          end
        elsif result =~ /Breakpoint .*? (__GI_)?_exit (\(status=(\d+)\))?/
          status_param = $3
          backtraces = execute("thread apply all bt full").strip
          if backtraces.empty?
            backtraces = execute("bt full").strip
          end
          snapshot = yield(self) if block_given?
          # On OS X, gdb may fail to return from the 'continue' command
          # even though the process exited. Kernel bug? In any case,
          # we put a timeout here so that we don't wait indefinitely.
          result = execute("continue", 10)
          if result =~ /^(Program|.*process .*) exited with code (\d+)/
            return ExitInfo.new($2.to_i, nil, backtraces, snapshot)
          elsif result =~ /^(Program|.*process .*) exited normally/
            return ExitInfo.new(0, nil, backtraces, snapshot)
          elsif status_param.nil? || status_param.empty?
            return ExitInfo.new(nil, nil, backtraces, snapshot)
          else
            return ExitInfo.new(status_param.to_i, nil, backtraces, snapshot)
          end
        elsif result =~ /^(Program|.*process .*) exited with code (\d+)\.$/
          return ExitInfo.new($2.to_i, nil, nil, nil)
        elsif result =~ /^(Program|.*process .*) exited normally/
          return ExitInfo.new(0, nil, nil, nil)
        else
          return ExitInfo.new(nil, nil, nil, nil)
        end
      end
    end

  private
    def find_gdb
      result = nil
      if ENV['GDB'] && File.executable?(ENV['GDB'])
        result = ENV['GDB']
      else
        ENV['PATH'].to_s.split(/:+/).each do |path|
          filename = "#{path}/gdb"
          if File.file?(filename) && File.executable?(filename)
            result = filename
            break
          end
        end
      end

      puts "Found gdb at: #{result}" if result

      config = defined?(RbConfig) ? RbConfig::CONFIG : Config::CONFIG
      if config['target_os'] =~ /freebsd/ && result == "/usr/bin/gdb"
        # /usr/bin/gdb on FreeBSD is broken:
        # https://github.com/FooBarWidget/crash-watch/issues/1
        # Look for a newer one that's installed from ports.
        puts "#{result} is broken on FreeBSD. Looking for an alternative..."
        result = nil
        ["/usr/local/bin/gdb76", "/usr/local/bin/gdb66"].each do |candidate|
          if File.executable?(candidate)
            result = candidate
            break
          end
        end

        if result.nil?
          raise GdbBroken,
            "*** ERROR ***: '/usr/bin/gdb' is broken on FreeBSD. " +
            "Please install the one from the devel/gdb port instead. " +
            "If you want to use another gdb"
        else
          puts "Found gdb at: #{result}" if result
          result
        end
      elsif result.nil?
        raise GdbNotFound,
          "*** ERROR ***: 'gdb' not found. Please install it (and if using Nginx " +
          "ensure that PATH isn't filtered out, see also its \"env\" option).\n" +
          "       Debian/Ubuntu: sudo apt-get install gdb\n" +
          "RedHat/CentOS/Fedora: sudo yum install gdb\n" +
          "            Mac OS X: please install the Developer Tools or XCode\n" +
          "             FreeBSD: use the devel/gdb port\n"
      else
        result
      end
    end
  end
end