3rd-party/libtins
1
0
Fork 0
mirror of https://github.com/mfontanini/libtins synced 2026-01-25 03:31:36 +01:00
Code Issues Releases Wiki Activity

Add ICMP extensions structure class

Browse Source
This commit is contained in:
Matias Fontanini
2015-12-13 21:49:26 -08:00
parent 8aff1b4afe
commit 187e7b1ca3
5 changed files with 288 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
src/utils.cpp
View File

@@ -221,6 +221,10 @@ std::string to_string(PDU::PDUType pduType) {
}
uint32_t do_checksum(const uint8_t *start, const uint8_t *end) {
return Endian::host_to_be<uint32_t>(sum_range(start, end));
}
uint16_t sum_range(const uint8_t *start, const uint8_t *end) {
uint32_t checksum(0);
const uint8_t *last = end;
uint16_t buffer = 0;
@@ -229,16 +233,20 @@ uint32_t do_checksum(const uint8_t *start, const uint8_t *end) {
if(((end - start) & 1) == 1) {
last = end - 1;
padding = *(end - 1) << 8;
padding = *(end - 1);
}
while(ptr < last) {
memcpy(&buffer, ptr, sizeof(uint16_t));
checksum += Endian::host_to_be(buffer);
checksum += buffer;
ptr += sizeof(uint16_t);
}
return checksum + padding;
checksum += padding;
while (checksum >> 16) {
checksum = (checksum & 0xffff) + (checksum >> 16);
}
return checksum;
}
uint32_t pseudoheader_checksum(IPv4Address source_ip, IPv4Address dest_ip, uint32_t len, uint32_t flag) {