[PHP] Treat UDP Channels as Sockets Instead of Streams

[zeroSteiner]

Should fix the tests that are intermittenly (though often at least in the case of PHP 5.3.29 on Windows). There were multiple underlying issues that were causing discrepancies in behviors.

1. The localhost / localport wasn't being used for sockets so the socket wasn't being bound to the address requested by Metasploit. This is still the case for TCP because those sockets are treated as streams and I'm not sure streams can be bound. This should likely be addressed in another ticket but the current tests don't cover this edge case so I'll leave it be.
2. UDP sockets were being treated as streams instead of sockets due to the ordering in connect. This seemed to be the core of the issue that was preventing the channel from receiving data.
3. The socket_sendto call was wrong. The per the PHP docs, $host argument was being treated as the flags argument.

Related to rapid7/metasploit-framework#20729

[jheysel-r7]

Great work, this fixes the Receives data from the peer flakey test 👍

Testing

Before:

msf post(test/socket_channels) > run
[*] Running against session -1
[*] Session type is meterpreter and platform is windows
[*] Running TCP client channel tests...
[+] [TCP-Client] Allows binding to port 0
[+] [TCP-Client] Has the correct peer information
[+] [TCP-Client] Receives data from the peer
[+] [TCP-Client] Sends data to the peer
[+] [TCP-Client] Propagates close events to the peer
[+] [TCP-Client] Propagates close events from the peer
[*] Running TCP server channel tests...
[-] [[TCP-Server] Allows binding to port 0] FAILED: [TCP-Server] Allows binding to port 0
[-] [[TCP-Server] Allows binding to port 0] Exception: Rex::Post::Meterpreter::RequestError: core_channel_open: Operation failed: 1
[-] [[TCP-Server] Accepts a connection] FAILED: [TCP-Server] Accepts a connection
[-] [[TCP-Server] Accepts a connection] Exception: Rex::Post::Meterpreter::RequestError: core_channel_open: Operation failed: 1
[-] [[TCP-Server] Has the correct peer information] FAILED: [TCP-Server] Has the correct peer information
[-] [[TCP-Server] Has the correct peer information] Exception: Rex::Post::Meterpreter::RequestError: core_channel_open: Operation failed: 1
[-] [[TCP-Server] Receives data from the peer] FAILED: [TCP-Server] Receives data from the peer
[-] [[TCP-Server] Receives data from the peer] Exception: Rex::Post::Meterpreter::RequestError: core_channel_open: Operation failed: 1
[-] [[TCP-Server] Sends data to the peer] FAILED: [TCP-Server] Sends data to the peer
[-] [[TCP-Server] Sends data to the peer] Exception: Rex::Post::Meterpreter::RequestError: core_channel_open: Operation failed: 1
[-] [[TCP-Server] Propagates close events to the server] FAILED: [TCP-Server] Propagates close events to the server
[-] [[TCP-Server] Propagates close events to the server] Exception: Rex::Post::Meterpreter::RequestError: core_channel_open: Operation failed: 1
[-] [[TCP-Server] Propagates close events to the peer] FAILED: [TCP-Server] Propagates close events to the peer
[-] [[TCP-Server] Propagates close events to the peer] Exception: Rex::Post::Meterpreter::RequestError: core_channel_open: Operation failed: 1
[-] [[TCP-Server] Propagates close events from the peer] FAILED: [TCP-Server] Propagates close events from the peer
[-] [[TCP-Server] Propagates close events from the peer] Exception: Rex::Post::Meterpreter::RequestError: core_channel_open: Operation failed: 1
[*] Running UDP channel tests...
[+] [UDP] Allows binding to port 0
[-] FAILED: [UDP] Has the correct peer information
[-] FAILED: [UDP] Receives data from the peer
[+] [UDP] Sends data to the peer
[-] Passed: 8; Failed: 10; Skipped: 0

After:

msf post(test/socket_channels) > run
[*] Running against session -1
[*] Session type is meterpreter and platform is windows
[*] Running TCP client channel tests...
[+] [TCP-Client] Allows binding to port 0
[+] [TCP-Client] Has the correct peer information
[+] [TCP-Client] Receives data from the peer
[+] [TCP-Client] Sends data to the peer
[+] [TCP-Client] Propagates close events to the peer
[+] [TCP-Client] Propagates close events from the peer
[*] Running TCP server channel tests...
[-] [[TCP-Server] Allows binding to port 0] FAILED: [TCP-Server] Allows binding to port 0
[-] [[TCP-Server] Allows binding to port 0] Exception: Rex::Post::Meterpreter::RequestError: core_channel_open: Operation failed: 1
[-] [[TCP-Server] Accepts a connection] FAILED: [TCP-Server] Accepts a connection
[-] [[TCP-Server] Accepts a connection] Exception: Rex::Post::Meterpreter::RequestError: core_channel_open: Operation failed: 1
[-] [[TCP-Server] Has the correct peer information] FAILED: [TCP-Server] Has the correct peer information
[-] [[TCP-Server] Has the correct peer information] Exception: Rex::Post::Meterpreter::RequestError: core_channel_open: Operation failed: 1
[-] [[TCP-Server] Receives data from the peer] FAILED: [TCP-Server] Receives data from the peer
[-] [[TCP-Server] Receives data from the peer] Exception: Rex::Post::Meterpreter::RequestError: core_channel_open: Operation failed: 1
[-] [[TCP-Server] Sends data to the peer] FAILED: [TCP-Server] Sends data to the peer
[-] [[TCP-Server] Sends data to the peer] Exception: Rex::Post::Meterpreter::RequestError: core_channel_open: Operation failed: 1
[-] [[TCP-Server] Propagates close events to the server] FAILED: [TCP-Server] Propagates close events to the server
[-] [[TCP-Server] Propagates close events to the server] Exception: Rex::Post::Meterpreter::RequestError: core_channel_open: Operation failed: 1
[-] [[TCP-Server] Propagates close events to the peer] FAILED: [TCP-Server] Propagates close events to the peer
[-] [[TCP-Server] Propagates close events to the peer] Exception: Rex::Post::Meterpreter::RequestError: core_channel_open: Operation failed: 1
[-] [[TCP-Server] Propagates close events from the peer] FAILED: [TCP-Server] Propagates close events from the peer
[-] [[TCP-Server] Propagates close events from the peer] Exception: Rex::Post::Meterpreter::RequestError: core_channel_open: Operation failed: 1
[*] Running UDP channel tests...
[+] [UDP] Allows binding to port 0
[-] FAILED: [UDP] Has the correct peer information
[+] [UDP] Receives data from the peer
[+] [UDP] Sends data to the peer
[-] Passed: 9; Failed: 9; Skipped: 0