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Move the body of eth_get_pcap_devname back into intf_get_pcap_devname, leaving

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eth_get_pcap_devname as a wrapper.

In addition to the hardware address check, add a check of the textual interface
descriptions in order better to distinguish interfaces. It appears to me that
the pcap description (pdev->description) is the same as what is returned by a
call to PacketRequest with an OID of OID_GEN_FRIENDLY_NAME, so that's what I'm
comparing. That differs from OID_GEN_VENDOR_NAME, which is what you get in
ifrow.bDescr from GetIfTable.

We've found that simply comparing hardware addresses is not enough when using
Windows "teamed" (link-aggregated) interfaces. In a simple example, two NICs
are teamed together, leading to three interfaces visible to libdnet: the two
physical NICs and the virtual teamed interface. All three of these have the
same MAC address. What was happening was the eth0 interface was being assigned
to one of the physical NICs, packets were sent over it, but the replies were
not necessarily coming back to the same physical NIC.
This commit is contained in:
david
2010-05-13 04:06:53 +00:00
parent 5de02049fc
commit 48c6e7b820
3 changed files with 106 additions and 100 deletions
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1
libdnet-stripped/include/dnet/intf.h
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@@ -60,6 +60,7 @@ intf_t *intf_open(void);
int intf_get(intf_t *i, struct intf_entry *entry);
int intf_get_src(intf_t *i, struct intf_entry *entry, struct addr *src);
int intf_get_dst(intf_t *i, struct intf_entry *entry, struct addr *dst);
int intf_get_pcap_devname(const char *intf_name, char *pcapdev, int pcapdevlen);
int intf_set(intf_t *i, const struct intf_entry *entry);
int intf_loop(intf_t *i, intf_handler callback, void *arg);
intf_t *intf_close(intf_t *i);