# Compiling and using libpcap on Haiku

Haiku R1/beta4 and earlier versions do not support packet capture on the
loopback interface.  Using this version of libpcap, loopback capture works
since Haiku revision hrev57585 and is expected to work in Haiku R1/beta5 when
the latter becomes available.  Packet timestamping and filtering always occur
in userland.  Wireless monitor mode is not supported.  The "any"
pseudo-interface is not supported.
[**pcap_set_buffer_size**](https://www.tcpdump.org/manpages/pcap_set_buffer_size.3pcap.html)(3PCAP)
has no effect.
[**pcap_setdirection**](https://www.tcpdump.org/manpages/pcap_setdirection.3pcap.html)(3PCAP)
is not supported.
[**pcap_inject**](https://www.tcpdump.org/manpages/pcap_inject.3pcap.html)(3PCAP)
is not supported.

The statistics reported by
[**pcap_stats**](https://www.tcpdump.org/manpages/pcap_stats.3pcap.html)(3PCAP)
on Haiku are as follows:
* `ps_recv` is the number of packets successfully delivered by the kernel,
  before libpcap applies a filter.
* `ps_drop` is the number of packets rejected by the filter.
* `ps_ifdrop` is the number of packets dropped by the network interface (as
  seen via `SIOCGIFSTATS`) since the capture handle became active.

## 64-bit x86 R1/beta4

* Autoconf 2.71 works.
* CMake 3.28.3 works.
* GCC 13.2.0 works.
* Clang 12.0.1 works with the latest llvm12_clang-12.0.1-5 version.
* flex 2.6.4 works.
* bison 3.8.2 works.

The following command will install respective non-default packages:
```
pkgman install cmake llvm12_clang
```

For reference, the tests were done using a system installed from
`haiku-r1beta4-x86_64-anyboot.iso`.

## 32-bit x86 R1/beta4

* Autoconf 2.71 works.
* CMake 3.24.2 works.
* GCC 11.2.0 works.
* Clang does not work.
* flex 2.6.4 works.
* bison 3.0.5 works.

The following command will install respective non-default packages:
```
pkgman install cmake_x86
```

For reference, the tests were done using a system installed from
`haiku-r1beta4-x86_gcc2h-anyboot.iso`.