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Also fudge received times for NS scan

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This commit is contained in:
dmiller
2020-05-15 17:49:49 +00:00
parent 4fcc04cce5
commit bfef89e943
1 changed files with 7 additions and 4 deletions
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11
scan_engine_raw.cc
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@@ -1628,9 +1628,9 @@ bool get_arp_result(UltraScanInfo *USI, struct timeval *stime) {
/* Delay in libpcap could mean we sent another probe *after* this
* response was received. Search back for the last probe before rcvdtime. */
probeI--;
/* If the response came just a hair (<10ms) after the probe was sent, it's
/* If the response came just a hair (<25ms) after the probe was sent, it's
* probably a response to an earlier probe instead. Keep looking. */
TIMEVAL_MSEC_ADD(fudgedsenttime, (*probeI)->sent, INITIAL_ARP_RTT_TIMEOUT / 20);
TIMEVAL_MSEC_ADD(fudgedsenttime, (*probeI)->sent, INITIAL_ARP_RTT_TIMEOUT / 8);
} while (TIMEVAL_AFTER(fudgedsenttime, rcvdtime) && probeI != hss->probes_outstanding.begin());
ultrascan_host_probe_update(USI, hss, probeI, HOST_UP, &rcvdtime);
/* Now that we know the host is up, we can forget our other probes. */
@@ -1649,7 +1649,7 @@ bool get_ns_result(UltraScanInfo *USI, struct timeval *stime) {
int rc;
u8 rcvdmac[6];
struct sockaddr_in6 rcvdIP;
struct timeval rcvdtime;
struct timeval rcvdtime, fudgedsenttime;
bool timedout = false;
bool has_mac = false;
struct sockaddr_in6 sin6;
@@ -1709,7 +1709,10 @@ bool get_ns_result(UltraScanInfo *USI, struct timeval *stime) {
/* Delay in libpcap could mean we sent another probe *after* this
* response was received. Search back for the last probe before rcvdtime. */
probeI--;
} while (TIMEVAL_AFTER((*probeI)->sent, rcvdtime) && probeI != hss->probes_outstanding.begin());
/* If the response came just a hair (<25ms) after the probe was sent, it's
* probably a response to an earlier probe instead. Keep looking. */
TIMEVAL_MSEC_ADD(fudgedsenttime, (*probeI)->sent, INITIAL_ARP_RTT_TIMEOUT / 8);
} while (TIMEVAL_AFTER(fudgedsenttime, rcvdtime) && probeI != hss->probes_outstanding.begin());
ultrascan_host_probe_update(USI, hss, probeI, HOST_UP, &rcvdtime);
/* Now that we know the host is up, we can forget our other probes. */
hss->destroyAllOutstandingProbes();