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Diffstat (limited to 'util')
-rw-r--r--util/tap/tap.cc22
1 files changed, 13 insertions, 9 deletions
diff --git a/util/tap/tap.cc b/util/tap/tap.cc
index 7121ebcbb..2932cec35 100644
--- a/util/tap/tap.cc
+++ b/util/tap/tap.cc
@@ -200,7 +200,7 @@ main(int argc, char *argv[])
int bufsize = 2000;
bool listening = false;
char *device = NULL;
- char *filter = "";
+ char *filter = NULL;
char c;
int daemon = false;
string host;
@@ -274,16 +274,20 @@ main(int argc, char *argv[])
if (pcap == NULL)
panic("pcap_open_live failed: %s\n", errbuf);
- bpf_program program;
- bpf_u_int32 localnet, netmask;
- if (pcap_lookupnet(device, &localnet, &netmask, errbuf) == -1)
- panic("pcap_lookupnet failed: %s\n", errbuf);
+ if (filter) {
+ bpf_program program;
+ bpf_u_int32 localnet, netmask;
+ if (pcap_lookupnet(device, &localnet, &netmask, errbuf) == -1) {
+ DPRINTF("pcap_lookupnet failed: %s\n", errbuf);
+ netmask = 0xffffff00;
+ }
- if (pcap_compile(pcap, &program, filter, 1, netmask) == -1)
- panic("pcap_compile failed, invalid filter:\n%s\n", filter);
+ if (pcap_compile(pcap, &program, filter, 1, netmask) == -1)
+ panic("pcap_compile failed, invalid filter:\n%s\n", filter);
- if (pcap_setfilter(pcap, &program) == -1)
- panic("pcap_setfilter failed\n");
+ if (pcap_setfilter(pcap, &program) == -1)
+ panic("pcap_setfilter failed\n");
+ }
eth_t *ethernet = eth_open(device);
if (!ethernet)