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Full Discussion: "Phantom character" in Socket (RESOLVED)
Top Forums UNIX for Advanced & Expert Users "Phantom character" in Socket (RESOLVED) Post 302332247 by trutoman on Thursday 9th of July 2009 09:18:12 AM
Old 07-09-2009
"Phantom character" in Socket (RESOLVED)
Hi everyone:

I have built a tcl script, this script communicate with an ADA program trough a socket, sending binary data, the sender proc is this one:

The code where im sending info is here:
Code:
proc p_send_data { DATA } {
  global connection
  puts "Sending trough $connection..."
 
  # This is just the string of bytes im sending
  binary scan $DATA H22 hexa
  puts "IM SENDING THIS ------>  $hexa"

  # Put it trough socket
  puts -nonewline "$connection" $DATA
  flush $connection
  }

It usually works fine, but with some values of DATA, socket, a little demon or something is adding a byte to my string !!

The output of program "IM SENDING THIS -----> 0109450900018813bc0400"

Like you can see this line is printed just before puts data in socket.

The "tcpdump" capture ----------------------------------> 010945090001c28813bc0400

The bytes are the same excepts that c2 insertion.

With strace i can see how system writes in socket this:

Code:
write(1, "IM SENDING THIS ------>  010945090001"..., 44IM SENDING THIS ------>  0109450900018813bc0400) = 44
sendto(4, "\1\tE\t\0\1\302\210\23\302\274\4\0001212", 17, 0, NULL, 0) = 17

Sometimes with different values of DATA this byte "c2" appears......always in the same position !! . After looking info trough internet, iknow that c2 is 194 in decimal and it doesn't look like a dangerous character like "\00" "\7f" could be.

Perhaps an error in c libraries of sockets??

This is my system : Linux 2.6.9-67
TCLInterpreter : 8.4

Plz Help me . THX!!

---------- Post updated 09-07-09 at 03:18 PM ---------- Previous update was 08-07-09 at 07:01 PM ----------

Nobody response.

I have fixed it !!!! exactly 20 hours after.

Par default a socket connection its created with "-encoding = utf-8" . But i was sending binary data, so sometimes (when my binary bytes matched up with a ascii code) it interpret that like some ascii char and the socket translated automatically to ascii code.
So the solution is to configure socket with "-encoding = binary".in tcl.
"fconfigure connection -encoding binary"

it was quite easy ....... like ever.
 

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LEARN ABOUT PHP

eventutil

EVENTUTIL(3)								 1							      EVENTUTIL(3)

The EventUtil class

INTRODUCTION

       EventUtil is a singleton with supplimentary methods and constants.

CLASS SYNOPSIS

       EventUtil

       final
       EventUtil

       Constants

       o const integer$EventUtil::AF_INET2

       o const integer$EventUtil::AF_INET610

       o const integer$EventUtil::AF_UNSPEC0

       o const integer$EventUtil::LIBEVENT_VERSION_NUMBER33559808

       o const integer$EventUtil::SO_DEBUG1

       o const integer$EventUtil::SO_REUSEADDR2

       o const integer$EventUtil::SO_KEEPALIVE9

       o const integer$EventUtil::SO_DONTROUTE5

       o const integer$EventUtil::SO_LINGER13

       o const integer$EventUtil::SO_BROADCAST6

       o const integer$EventUtil::SO_OOBINLINE10

       o const integer$EventUtil::SO_SNDBUF7

       o const integer$EventUtil::SO_RCVBUF8

       o const integer$EventUtil::SO_SNDLOWAT19

       o const integer$EventUtil::SO_RCVLOWAT18

       o const integer$EventUtil::SO_SNDTIMEO21

       o const integer$EventUtil::SO_RCVTIMEO20

       o const integer$EventUtil::SO_TYPE3

       o const integer$EventUtil::SO_ERROR4

       o const integer$EventUtil::SOL_SOCKET1

       o const integer$EventUtil::SOL_TCP6

       o const integer$EventUtil::SOL_UDP17

       o const integer$EventUtil::IPPROTO_IP0

       o const integer$EventUtil::IPPROTO_IPV641

       Methods

       o abstractpublic EventUtil::__construct (void  )

       o publicstatic int EventUtil::getLastSocketErrno NULL ([mixed  $socket])

       o publicstatic string EventUtil::getLastSocketError ([mixed  $socket])

       o publicstatic int EventUtil::getSocketFd (mixed  $socket)

       o publicstatic bool EventUtil::getSocketName (mixed  $socket, string  &$address, [mixed	&$port])

       o publicstatic bool EventUtil::setSocketOption (mixed  $socket, int  $level, int  $optname, mixed  $optval)

       o publicstatic void EventUtil::sslRandPoll (void  )

PREDEFINED CONSTANTS

	      o EventUtil::AF_INET - IPv4 address family

	      o EventUtil::AF_INET6 - IPv6 address family

	      o EventUtil::AF_UNSPEC - Unspecified IP address family

	      o EventUtil::SO_DEBUG  -	Socket option. Enable socket debugging. Only allowed for processes with the CAP_NET_ADMIN capability or an
		effective user ID of 0 . (Added in event-1.6.0.)

	      o EventUtil::SO_REUSEADDR - Socket option. Indicates that the rules used in validating addresses supplied in a bind(2)  call  should
		allow reuse of local addresses. See the socket(7) manual page. (Added in event-1.6.0.)

	      o EventUtil::SO_KEEPALIVE  - Socket option. Enable sending of keep-alive messages on connection-oriented sockets. Expects an integer
		boolean flag. See the socket(7) manual page. (Added in event-1.6.0.)

	      o EventUtil::SO_DONTROUTE - Socket option. See the socket(7) manual page. (Added in event-1.6.0.)

	      o EventUtil::SO_LINGER - Socket option. When enabled, a close(2) or shutdown(2) will not return until all queued	messages  for  the
		socket have been successfully sent or the linger timeout has been reached. Otherwise, the call returns immediately and the closing
		is done in the background. See the socket(7) manual page. (Added in event-1.6.0.)

	      o EventUtil::SO_BROADCAST - Socket option. Reports whether transmission of broadcast messages is supported. See the socket(7) manual
		page. (Added in event-1.6.0.)

	      o EventUtil::SO_OOBINLINE - Socket option. See the socket(7) manual page. (Added in event-1.6.0.)

	      o EventUtil::SO_SNDBUF - Socket option. See the socket(7) manual page. (Added in event-1.6.0.)

	      o EventUtil::SO_RCVBUF - Socket option. See the socket(7) manual page. (Added in event-1.6.0.)

	      o EventUtil::SO_SNDLOWAT - Socket option. See the socket(7) manual page. (Added in event-1.6.0.)

	      o EventUtil::SO_RCVLOWAT - Socket option. See the socket(7) manual page. (Added in event-1.6.0.)

	      o EventUtil::SO_SNDTIMEO - Socket option. See the socket(7) manual page. (Added in event-1.6.0.)

	      o EventUtil::SO_RCVTIMEO - Socket option. See the socket(7) manual page. (Added in event-1.6.0.)

	      o EventUtil::SO_TYPE - Socket option. See the socket(7) manual page. (Added in event-1.6.0.)

	      o EventUtil::SO_ERROR - Socket option. See the socket(7) manual page. (Added in event-1.6.0.)

	      o EventUtil::SOL_SOCKET - Socket option level. See the socket(7) manual page. (Added in event-1.6.0.)

	      o EventUtil::SOL_TCP - Socket option level. See the socket(7) manual page. (Added in event-1.6.0.)

	      o EventUtil::SOL_UDP - Socket option level. See the socket(7) manual page. (Added in event-1.6.0.)

	      o EventUtil::IPPROTO_IP - See the socket(7) manual page. (Added in event-1.6.0.)

	      o EventUtil::IPPROTO_IPV6 - See the socket(7) manual page. (Added in event-1.6.0.)

	      o EventUtil::LIBEVENT_VERSION_NUMBER - Libevent' version number at the time when Event extension had been compiled with the library.

PHP Documentation Group 													      EVENTUTIL(3)
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