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Allow layer-2 sending for non-Ethernet links; MAC addr optional

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This commit is contained in:
dmiller
2025-06-26 19:03:01 +00:00
parent f2028a2007
commit fc71b7544d
5 changed files with 82 additions and 45 deletions
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27
scan_engine.cc
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@@ -949,18 +949,23 @@ void UltraScanInfo::Init(std::vector<Target *> &Targets, const struct scan_lists
aren't doing a TCP connect scan, or if we're doing a ping scan that
requires it. */
if (isRawScan()) {
if (ping_scan_arp || (ping_scan_nd && o.sendpref != PACKET_SEND_IP_STRONG) || ((o.sendpref & PACKET_SEND_ETH) &&
(Targets[0]->ifType() == devt_ethernet
#ifdef WIN32
|| (Targets[0]->ifType() == devt_loopback)
#endif
))) {
const char *device = Targets[0]->deviceName();
if (ping_scan_arp || (ping_scan_nd && o.sendpref != PACKET_SEND_IP_STRONG) || (o.sendpref & PACKET_SEND_ETH)) {
/* We'll send ethernet packets with dnet */
ethsd = eth_open_cached(Targets[0]->deviceName());
if (ethsd == NULL)
fatal("dnet: Failed to open device %s", Targets[0]->deviceName());
rawsd = -1;
} else {
ethsd = eth_open_cached(device);
if (ethsd == NULL) {
error("dnet: Failed to open device %s", device);
}
else if (!netutil_eth_can_send(ethsd)) {
ethsd = NULL;
}
/* If eth failed, we can fall back to raw socket. The only exception is
* ARP ping, which needs Ethernet link. */
if (ping_scan_arp && (ethsd == NULL || netutil_eth_datalink(ethsd) != DLT_EN10MB)) {
fatal("ARP ping not supported on %s", device);
}
}
if (ethsd == NULL) {
#ifdef WIN32
win32_fatal_raw_sockets(Targets[0]->deviceName());
#endif