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8.9

Iffy buffer

Asked by CEHJ in Perl Programming Language

I'm doubtful about the use of the buffer in the code below. Also i'm getting some runtime errors:

"substr outside of string at /bk/goose/tmptmp/sss.working-copy.pl line 203.
Use of uninitialized value $buff in ord at /bk/goose/tmptmp/sss.working-copy.pl line 203."
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195     if($success) {
196         $t = sysread($client, $buff, 3);
197 
198         printf("Before line %d\n", 199);
199         printf("%d bytes were read\n", $t);
200         my $char1 = substr($buff, 0, 1);
201         printf("char1 was %d\n", ord($char1));
202         if(substr($buff, 0, 1) eq "\x05") {
203             if(ord(substr($buff, 2, 1)) == 0) { # reserved
204                 my($host, $raw_host) = socks_get_host($client);
205                 if(!$host) {
206                     # CJ
207                     print "Could not get host\n";
208                     return;
209                 }
210                 else {
211                     print "Got host\n";
212                 }
213                 my($port, $raw_port) = socks_get_port($client);
214                 if(!$port) {
215                     # CJ
216                     print "Could not get port\n";
217                     return;
218                 }
219                 else {
220                     print "Got port\n";
221                 }
222                 $ord = ord(substr($buff, 1, 1));
223                 $buff = "\x05\x00\x00".$raw_host.$raw_port;
224                 syswrite($client, $buff, length($buff));
225                 socks_do($ord, $client, $host, $port);
226             }
227         }
228     }
[+][-]09/18/09 09:39 AM, ID: 25367686Accepted Solution

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Zone: Perl Programming Language
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Solution Provided By: nemws1
Participating Experts: 2
Solution Grade: A
 
[+][-]09/18/09 08:41 AM, ID: 25367118Expert Comment

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[+][-]09/18/09 11:47 AM, ID: 25368751Expert Comment

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[+][-]09/22/09 09:41 AM, ID: 25394735Assisted Solution

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