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TCP now stores options when instantiated from a buffer.

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This commit is contained in:
Matias Fontanini
2011-08-19 11:40:13 -03:00
parent 03aa49428c
commit 2513488b92
3 changed files with 106 additions and 46 deletions
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22
src/dhcp.cpp
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@@ -40,20 +40,26 @@ Tins::DHCP::DHCP() : _size(sizeof(uint32_t) + 1) {
Tins::DHCP::DHCP(const uint8_t *buffer, uint32_t total_sz) : BootP(buffer, total_sz, 0) {
buffer += BootP::header_size();
total_sz -= BootP::header_size();
uint8_t args[2];
uint8_t args[2] = {0};
while(total_sz) {
for(unsigned i(0); i < 2; ++i) {
for(unsigned i(0); i < 2 && args[0] != END; ++i) {
args[i] = *(buffer++);
total_sz--;
if(!total_sz)
throw std::runtime_error("Not enought size for a DHCP header in the buffer.");
}
// Not enough size for this option
if(total_sz < args[1])
throw std::runtime_error("Not enought size for a DHCP header in the buffer.");
add_option((Options)args[0], args[1], buffer);
buffer += args[1];
total_sz -= args[1];
// If the END-OF-OPTIONS was not found...
if(args[0] != END) {
// Not enough size for this option
if(total_sz < args[1])
throw std::runtime_error("Not enought size for a DHCP header in the buffer.");
add_option((Options)args[0], args[1], buffer);
buffer += args[1];
total_sz -= args[1];
}
// Otherwise, break the loop.
else
total_sz = 0;
}
}