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correct timestamp notes #192

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merged 1 commit into from
Dec 20, 2024
Merged

correct timestamp notes #192

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14 changes: 4 additions & 10 deletions src/socketvxlan.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -143,23 +143,17 @@ int PcapExportVxlan::exportPacket(size_t index,
std::memcpy(reinterpret_cast<void *>(&(vxlanbuffer[sizeof(vxlan_hdr_t)])),
reinterpret_cast<const void *>(pkt_data), length);
uint32_t tv_sec = htonl(header->ts.tv_sec);
/*注意：通过libpcap获取的捕获时间精度与系统中断精度有关，该数值单位可能是毫秒或者微秒，可以通过以下命令查看
*==============================================
* grep CONFIG_HZ /boot/config-$(uname -r)
* CONFIG_HZ_1000=y
* CONFIG_HZ=1000
*===============================================
* 因为Centos7.9系统中断默认ms级别，所以此处*1000，后续将增加自适应判断是否需要进行转换。
*/
uint32_t tv_usec = htonl(header->ts.tv_usec*1000);
//注意：通过libpcap获取的捕获时间精度为微秒，而数据包中附加的时间为纳秒，所以需要*1000
uint32_t tv_nsec = htonl(header->ts.tv_usec*1000);
std::cout << "====got time" << header->ts.tv_usec<< std::endl;
if (_capTime == 1) {
memcpy(
reinterpret_cast<void *>(&(vxlanbuffer[sizeof(vxlan_hdr_t)]) + length),
&tv_sec, sizeof(uint32_t));
length += 4;
memcpy(
reinterpret_cast<void *>(&(vxlanbuffer[sizeof(vxlan_hdr_t)]) + length),
&tv_usec, sizeof(uint32_t));
&tv_nsec, sizeof(uint32_t));
length += 4;
}
if (_vni_version == 1) {
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