require 'socket'
def open_port(host, port) #test whether if the port is open
sock = Socket.new(:INET, :STREAM)
raw = Socket.sockaddr_in(port, host)
puts "#{port} open." if sock.connect(raw)
rescue (Errno::ECONNREFUSED)
end #end of the function
def main(host, start_port, end_port)
start_port =1
if start_port<(end_port/2)
a = Thread.new { loop do
open_port(host,port)
start_port = start_port + 1
if start_port == (end_port/2)
break
end #end of the nearest "if"
end #end of the nearest "loop"
}
a.join
end
if start_port>(end_port/2)
b = Thread.new { loop do
open_port(host,port)
start_port = start_port + 1
if start_port == end_port
break
end #end of the nearest "if"
end #end of the nearest "if"
}
b.join
end
end
main ARGV[0], ARGV[1].to_i, ARGV[2].to_i
- #扫描端口，若打开，显示#port if open
- 第一段函数单独测试过没有问题
- 问题出在 main 函数内
- #输入：ruby *.rb "host" "start-port" "end-port"
哪里出问题了额。。改了半天。。囧
稍稍重写了一下你的代码，没试过，不知道可行性如何，有没有错误
require 'socket'
def open_port(host, port) #test whether if the port is open
sock = Socket.new(:INET, :STREAM)
begin
raw = Socket.sockaddr_in(port, host)
puts "#{port} open." if sock.connect(raw)
rescue
Errno::ECONNREFUSED
end
end #end of the function
def main(host, start_port, end_port)
start_port = 1
another_port = end_port / 2
the_ending_port = case
when start_port < another_port then another_port
when start_port > another_port then end_port
end
Thread.new { start_port.upto(the_ending_port) { |port| open_port(host, port) } }.join
end
还是不能太适应 rescue 单独使用，所以强制加上了 begin，
另外，start_port == end_port / 2，你怎么办？我看你 if 里面没有涉及到。
所以 the_ending_port 我只能用 case when 了，就没用三目运算 the_ending_port = (start_port < another_port) ? another_port : end_port
drine
#6
2013年09月22日
