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Code Issues Releases Wiki Activity

Added parsing of options to IP

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This commit is contained in:
Santiago Alessandri
2011-08-19 11:23:38 -03:00
parent 03aa49428c
commit dbd2acc040
2 changed files with 47 additions and 6 deletions
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2
include/ip.h
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@@ -107,7 +107,7 @@ namespace Tins {
* \param total_sz The total size of the buffer.
*/
IP(const uint8_t *buffer, uint32_t total_sz);
/**
* \brief Destructor for IP objects.
*

51
src/ip.cpp
View File

@@ -50,9 +50,51 @@ Tins::IP::IP(const uint8_t *buffer, uint32_t total_sz) : PDU(IPPROTO_IP) {
if(total_sz < sizeof(iphdr))
throw std::runtime_error("Not enought size for an IP header in the buffer.");
std::memcpy(&_ip, buffer, sizeof(iphdr));
/* Options... */
/* Establish beginning and ending of the options */
const uint8_t* ptr_buffer = buffer + sizeof(iphdr);
buffer += head_len() * sizeof(uint32_t);
this->_options_size = 0;
this->_padded_options_size = head_len() * sizeof(uint32_t) - sizeof(iphdr);
/* While the end of the options is not reached read an option */
while (ptr_buffer < buffer && (*ptr_buffer != 0)) {
IpOption opt_to_add;
opt_to_add.optional_data = NULL;
opt_to_add.optional_data_size = 0;
memcpy(&opt_to_add.type, ptr_buffer, 1);
ptr_buffer++;
switch (opt_to_add.type.number) {
/* Multibyte options with length as second byte */
case IPOPT_SEC:
case IPOPT_LSSR:
case IPOPT_TIMESTAMP:
case IPOPT_EXTSEC:
case IPOPT_RR:
case IPOPT_SID:
case IPOPT_SSRR:
case IPOPT_MTUPROBE:
case IPOPT_MTUREPLY:
case IPOPT_EIP:
case IPOPT_TR:
case IPOPT_ADDEXT:
case IPOPT_RTRALT:
case IPOPT_SDB:
case IPOPT_DPS:
case IPOPT_UMP:
case IPOPT_QS:
opt_to_add.optional_data_size = *ptr_buffer - 1;
opt_to_add.optional_data = new uint8_t[opt_to_add.optional_data_size];
memcpy(opt_to_add.optional_data, ptr_buffer, opt_to_add.optional_data_size);
ptr_buffer += opt_to_add.optional_data_size;
}
this->_ip_options.push_back(opt_to_add);
this->_options_size += 1 + opt_to_add.optional_data_size;
}
total_sz -= head_len() * sizeof(uint32_t);
if (total_sz == 0)
return;
switch(_ip.protocol) {
case IPPROTO_TCP:
inner_pdu(new Tins::TCP(buffer, total_sz));
@@ -224,17 +266,16 @@ Tins::PDU *Tins::IP::recv_response(PacketSender *sender) {
void Tins::IP::write_serialization(uint8_t *buffer, uint32_t total_sz, const PDU* parent) {
uint32_t my_sz = header_size();
uint32_t new_flag;
assert(total_sz >= my_sz);
if(inner_pdu()) {
uint32_t new_flag;
new_flag = inner_pdu()->flag();
if(new_flag == IPPROTO_IP)
new_flag = IPPROTO_IPIP;
this->protocol(new_flag);
this->flag(new_flag);
}
else
new_flag = IPPROTO_IP;
this->flag(new_flag);
this->protocol(new_flag);
this->tot_len(total_sz);
this->head_len (my_sz / sizeof(uint32_t));