From: Michael Conrad <list-ruby@...>
Date: 2008-04-03T06:22:25+09:00
Subject: Socket::Constants incomplete ?

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Hi,

today I tried to use ruby to read data from an ax25 socket using the socket api.

I think, that some definitions/constants are missing. There are no constants
for AF_AX25, AF_PACKET and the method htons is missing also.

I have attached two (ugly, undocumented, unportable ;-) files, one
containing a small c example, the other the correspoding ruby code.

Output of listen.c

af_packet: 17, sock_packet: 10, htons( AX25): 512
received: 101 bytes
  � � h � ` r ` � � ` � � � � � � ` � � @ ` � � � � b @ ` � � ` � � @ � � � � � d @ c  � = 4 9 3 2 . 2 3 N / 0 0 8 2 2 
. 7 0 E _ . . . / . . . g . . . t 0 4 9 r 0 0 0 p 0 0 0 R 0 0 0 h 5 6 b 1 0 2 3 0

Output of listen.rb

socket: #<Socket:0xb7cd8748>
received: 101 bytes
� � h � ` r ` � � ` � � � � � � ` � � @ ` � � � � b @ ` � � ` � � @ � � � � � d @ c  � = 4 9 3 2 . 2 3 N / 0 0 8 2 2 . 
7 0 E _ . . . / . . . g . . . t 0 4 9 r 0 0 0 p 0 0 0 R 0 0 0 h 5 6 b 1 0 2 3 0


Is the incomplete ruby socket api a bug or do I have make something wrong ?

My dpkg (debian packet tool) says

ii  ruby1.8        1.8.6.114-2    Interpreter of object-oriented scripting lan



Regards

      Michael Conrad

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#include <sys/socket.h>
#include <linux/if_ether.h>

#include <stdio.h>


int main( int argc, char **argv)
{
  int i;
  int sock;
  int size;
  unsigned char buffer[1500];
  
  struct sockaddr sa;
  int sa_size = sizeof( sa);

  sock = socket( AF_PACKET, SOCK_PACKET, htons( ETH_P_AX25));

  printf( "af_packet: %i, sock_packet: %i, htons( AX25): %i\n", AF_PACKET, SOCK_PACKET, htons( ETH_P_AX25));

  size = recvfrom( sock, buffer, sizeof( buffer), 0, &sa, &sa_size);

  printf( "received: %i bytes\n", size);
  for( i=0; i<size; i++) {
    printf( "%c ", buffer[i]);
  }
  printf( "\n");

} 

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