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macOS: PCAP: Add code necessary for device discovery 

You will still need chmod_bpf or similar to find devices
pull/49/head
Paul Hollinsky 2021-06-17 21:07:22 -04:00
parent ca83d7c4f2
commit 02c14aeb35
1 changed files with 29 additions and 6 deletions
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35
platform/posix/pcap.cpp
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@ -7,8 +7,10 @@
#include <cstring>
#include <sys/types.h>
#include <sys/socket.h>
#ifndef __APPLE__
#ifdef __linux__
#include <netpacket/packet.h>
#else
#include <net/if_dl.h>
#endif
using namespace icsneo;
@ -55,15 +57,23 @@ std::vector<PCAP::PCAPFoundDevice> PCAP::FindAll() {
pcap_addr* currentAddress = dev->addresses;
bool hasAddress = false;
while(!hasAddress && currentAddress != nullptr) {
#ifndef __APPLE__
#ifdef __linux__
if(currentAddress->addr && currentAddress->addr->sa_family == AF_PACKET) {
struct sockaddr_ll* s = (struct sockaddr_ll*)currentAddress->addr;
memcpy(netif.macAddress, s->sll_addr, sizeof(netif.macAddress));
hasAddress = true;
break;
}
#else
//TODO: get adapter address on macOS
#else // macOS and likely other BSDs
if(currentAddress->addr && currentAddress->addr->sa_family == AF_LINK) {
struct sockaddr_dl* s = (struct sockaddr_dl*)currentAddress->addr;
if(s->sdl_alen == 6 && s->sdl_alen + s->sdl_nlen < sizeof(s->sdl_data)) {
const uint8_t* mac = (uint8_t*)(s->sdl_data) + s->sdl_nlen;
memcpy(netif.macAddress, mac, sizeof(netif.macAddress));
hasAddress = true;
break;
}
}
#endif
currentAddress = currentAddress->next;
}
@ -91,7 +101,13 @@ std::vector<PCAP::PCAPFoundDevice> PCAP::FindAll() {
// continue; // Win32 did not find this interface in the previous step
errbuf[0] = '\0';
iface.fp = pcap_open_live(iface.nameFromPCAP.c_str(), 65536, 1, -1, errbuf);
iface.fp = pcap_open_live(iface.nameFromPCAP.c_str(), 65536, 1,
#ifdef __linux__ // -1 is required for instant reporting of new packets
-1, // to_ms
#else // macOS gives BIOCSRTIMEOUT for -1 and no packets for 0
0,
#endif
errbuf);
// TODO Handle warnings
// if(strlen(errbuf) != 0) { // This means a warning
// std::cout << "Warning for " << iface.nameFromPCAP << " " << errbuf << std::endl;
@ -209,13 +225,20 @@ bool PCAP::open() {
return false;
// Open the interface
iface.fp = pcap_open_live(iface.nameFromPCAP.c_str(), 65536, 1, -1, errbuf);
iface.fp = pcap_open_live(iface.nameFromPCAP.c_str(), 65536, 1,
#ifdef __linux__ // -1 is required for instant reporting of new packets
-1, // to_ms
#else // macOS gives BIOCSRTIMEOUT for -1 and no packets for 0
1,
#endif
errbuf);
if(iface.fp == nullptr) {
report(APIEvent::Type::DriverFailedToOpen, APIEvent::Severity::Error);
return false;
}
pcap_setnonblock(iface.fp, 0, errbuf);
pcap_set_immediate_mode(iface.fp, 1);
// Create threads
readThread = std::thread(&PCAP::readTask, this);