[Plugins-writers] Bug in htonl (network_func.nasl) and help needed in building packe payload

jdong@private

Hi Gents,

I found a possible bug in htonl function located in network_func.nasl:

1 function htonl(n)

2 {

3   local_var     i, j, s;

4   j = n;        

5  for (i = 0; j < 4; j ++)        ######## Here, shouldn't it be i < 4;
i++ ###########

6   {

7     s[i] = j & 0xFF;

8    j >>>= 8;

9   }

10   return raw_string(s[3], s[2], s[1], s[0]);

11 }

In line 5, shouldn't it be 'for( i = 0; i < 4; i++ )'?

I have checked nessus version 2.2.4 and 2.2.5, but got the same code.

I also have a question that needs your help: how can I forge ICMP
payload data?

I need 2 bytes source port, 2 bytes destination port, and 4 bytes
sequence #,

So I wrote like 'data = raw_string( htons(sport), htons(dport),
htonl(seq) );' but it's not working. Any idea?

Thank you for the help!

Jingyu Dong

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