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Add some comments and remove some unused code

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luis
2011-07-26 12:03:49 +00:00
parent 3f3fc7dc07
commit ad3e5dadc2
1 changed files with 5 additions and 2 deletions
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7
osscan2.cc
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@@ -347,6 +347,8 @@ static void begin_sniffer(HostOsScan *HOS, vector<Target *> &Targets) {
bool doIndividual = Targets.size() <= 20; // Don't bother IP limits if scanning huge # of hosts bool doIndividual = Targets.size() <= 20; // Don't bother IP limits if scanning huge # of hosts
pcap_filter[0] = '\0'; pcap_filter[0] = '\0';
/* If we have 20 or less targets, build a list of addresses so we can set
* an explicit BPF filter */
if (doIndividual) { if (doIndividual) {
for(targetno = 0; targetno < Targets.size(); targetno++) { for(targetno = 0; targetno < Targets.size(); targetno++) {
len = Snprintf(dst_hosts + filterlen, len = Snprintf(dst_hosts + filterlen,
@@ -361,11 +363,12 @@ static void begin_sniffer(HostOsScan *HOS, vector<Target *> &Targets) {
if (len < 0 || len + filterlen >= (int) sizeof(dst_hosts)) if (len < 0 || len + filterlen >= (int) sizeof(dst_hosts))
fatal("ran out of space in dst_hosts"); fatal("ran out of space in dst_hosts");
} }
filterlen = 0;
/* Open a network interface for packet capture */
if((HOS->pd=my_pcap_open_live(Targets[0]->deviceName(), 8192, (o.spoofsource)? 1 : 0, pcap_selectable_fd_valid()? 200 : 2))==NULL) if((HOS->pd=my_pcap_open_live(Targets[0]->deviceName(), 8192, (o.spoofsource)? 1 : 0, pcap_selectable_fd_valid()? 200 : 2))==NULL)
fatal("%s", PCAP_OPEN_ERRMSG); fatal("%s", PCAP_OPEN_ERRMSG);
/* Build the final BPF filter */
if (doIndividual) if (doIndividual)
len = Snprintf(pcap_filter, sizeof(pcap_filter), "dst host %s and (icmp or (tcp and (%s", len = Snprintf(pcap_filter, sizeof(pcap_filter), "dst host %s and (icmp or (tcp and (%s",
inet_ntoa(Targets[0]->v4source()), dst_hosts); inet_ntoa(Targets[0]->v4source()), dst_hosts);
@@ -374,8 +377,8 @@ static void begin_sniffer(HostOsScan *HOS, vector<Target *> &Targets) {
inet_ntoa(Targets[0]->v4source())); inet_ntoa(Targets[0]->v4source()));
if (len < 0 || len >= (int) sizeof(pcap_filter)) if (len < 0 || len >= (int) sizeof(pcap_filter))
fatal("ran out of space in pcap filter"); fatal("ran out of space in pcap filter");
filterlen = len;
/* Compile and apply the filter to the pcap descriptor */
if (o.debugging) log_write(LOG_PLAIN, "Packet capture filter (device %s): %s\n", Targets[0]->deviceFullName(), pcap_filter); if (o.debugging) log_write(LOG_PLAIN, "Packet capture filter (device %s): %s\n", Targets[0]->deviceFullName(), pcap_filter);
set_pcap_filter(Targets[0]->deviceFullName(), HOS->pd, pcap_filter); set_pcap_filter(Targets[0]->deviceFullName(), HOS->pd, pcap_filter);