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Add a BPF filter to traceroute so we only get packets sent to our own

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source address; i.e., not the packets we send.
This commit is contained in:
david
2009-09-17 22:50:09 +00:00
parent 923c04657a
commit 275a346804
1 changed files with 10 additions and 0 deletions
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10
traceroute.cc
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@@ -750,6 +750,10 @@ Probe *Probe::make(HostState *host, struct probespec pspec, u8 ttl)
TracerouteState::TracerouteState(std::vector<Target *> &targets) {
std::vector<Target *>::iterator it;
struct sockaddr_storage srcaddr;
size_t sslen;
char pcap_filter[128];
int n;
assert(targets.size() > 0);
@@ -774,6 +778,12 @@ TracerouteState::TracerouteState(std::vector<Target *> &targets) {
/* Assume that all the targets share the same device. */
pd = my_pcap_open_live(targets[0]->deviceName(), 128, o.spoofsource, 2);
sslen = sizeof(srcaddr);
targets[0]->SourceSockAddr(&srcaddr, &sslen);
n = Snprintf(pcap_filter, sizeof(pcap_filter), "dst host %s",
ss_to_string(&srcaddr));
assert(n < (int) sizeof(pcap_filter));
set_pcap_filter(targets[0]->deviceFullName(), pd, pcap_filter);
for (it = targets.begin(); it != targets.end(); it++) {
HostState *state = new HostState(*it);