char * corrupt_zeros(char * data, size_t * dataSz)
{
// Choose between zero corruption methods
// 0. Insert zeros in to the bitstream
// 1. Replace random bytes with zeros
int choice = randomInt(0, 1);
size_t corruptLoc = random_offset(*dataSz);
size_t corruptSize = randomInt(1, 0x100);
// we can't corrupt this crap TODO fix this
if(*dataSz < CORRUPT_START_MIN)
return data;
char * replacement = calloc(corruptSize, sizeof(char));
if(!replacement)
return data;
memset(replacement, 0x0, corruptSize);
if(choice == 0)
{
data = insertBytes(data, dataSz, replacement,
corruptSize, corruptLoc);
}
else if(choice == 1)
{
data = replaceBytes(data, dataSz, replacement,
corruptSize, corruptLoc);
}
return data;
}
char * corrupt_edgenum(char * data, size_t * dataSz)
{
/* Corruptor: Edgenum
*
* Goal: tries to add values determined to be the 'edges'
* of the common data types. Think 0, -1, MAX_INT, MAX_INT-1,
* etc.
*
* This corruptor should only replace, never insert. We want
* to mess up length fields.
*/
size_t corruptLoc = random_offset(*dataSz);
uint32_t corruptVal = randomInt(0, sizeof(corruptVals32) /
sizeof(corruptVals32[0])-1);
data = insertBytes(data, dataSz, (char *)&corruptVal,
sizeof(uint32_t), corruptLoc);
return data;
}
/**********************************************************************
*%FUNCTION: addTag
*%ARGUMENTS:
* packet -- a PPPoE packet
* tag -- tag to add
*%RETURNS:
* -1 if no room in packet; number of bytes added otherwise.
*%DESCRIPTION:
* Inserts a tag as the first tag in a PPPoE packet.
***********************************************************************/
int
addTag(PPPoEPacket *packet, PPPoETag const *tag)
{
return insertBytes(packet, packet->payload, tag,
ntohs(tag->length) + TAG_HDR_SIZE);
}
