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POSIX: PCAP: Enable if permissions are set, with a warning otherwise

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On Linux, raw packet capture requires CAP_NET_RAW (or root).

If we can't capture raw packets, we will not be able to find/connect to
devices over ethernet.
This commit is contained in:
Paul Hollinsky
2020-09-14 11:51:15 -04:00
parent a460e27657
commit 9dc4b302ef
2 changed files with 18 additions and 9 deletions
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platform/posix/pcap.cpp
+15 -6
View File
@@ -4,7 +4,6 @@
#include "icsneo/communication/packetizer.h"
#include <codecvt>
#include <chrono>
#include <iostream>
#include <cstring>
#include <sys/types.h>
#include <sys/socket.h>
@@ -20,6 +19,7 @@ static const uint8_t ICS_UNSET_MAC[6] = { 0x00, 0xFC, 0x70, 0xFF, 0xFF, 0xFF };
std::vector<PCAP::NetworkInterface> PCAP::knownInterfaces;
std::vector<PCAP::PCAPFoundDevice> PCAP::FindAll() {
static bool warned = false; // Only warn once for failure to open devices
std::vector<PCAPFoundDevice> foundDevices;
// First we ask WinPCAP to give us all of the devices
@@ -92,12 +92,17 @@ std::vector<PCAP::PCAPFoundDevice> PCAP::FindAll() {
errbuf[0] = '\0';
interface.fp = pcap_open_live(interface.nameFromWinPCAP.c_str(), 65536, 1, -1, errbuf);
if(strlen(errbuf) != 0) { // This means a warning
std::cout << "Warning for " << interface.nameFromWinPCAP << " " << errbuf << std::endl;
}
// TODO Handle warnings
// if(strlen(errbuf) != 0) { // This means a warning
// std::cout << "Warning for " << interface.nameFromWinPCAP << " " << errbuf << std::endl;
// }
if(interface.fp == nullptr) {
std::cout << "pcap_open_live failed for " << interface.nameFromWinPCAP << " with " << errbuf << std::endl;
if (!warned) {
warned = true;
EventManager::GetInstance().add(APIEvent::Type::PCAPCouldNotFindDevices, APIEvent::Severity::EventWarning);
// std::cout << "pcap_open_live failed for " << interface.nameFromWinPCAP << " with " << errbuf << std::endl;
}
continue; // Could not open the interface
}
@@ -122,7 +127,11 @@ std::vector<PCAP::PCAPFoundDevice> PCAP::FindAll() {
const uint8_t* data;
auto res = pcap_next_ex(interface.fp, &header, &data);
if(res < 0) {
std::cout << "pcapnextex failed with " << res << std::endl;
if (!warned) {
warned = true;
EventManager::GetInstance().add(APIEvent::Type::PCAPCouldNotFindDevices, APIEvent::Severity::EventWarning);
// std::cout << "pcapnextex failed with " << res << std::endl;
}
break;
}
if(res == 0)