Commit 30a580a8 authored by Philip Paeps's avatar Philip Paeps
Browse files

Import libpcap 1.9.1

parent d109bf9e
Wednesday, Jan. 25, 2017
Sunday, July 22, 2018
Summary for 1.9.1 libpcap release
Mention pcap_get_required_select_timeout() in the main pcap man page
Fix pcap-usb-linux.c build on systems with musl
Fix assorted man page and other documentation issues
Plug assorted memory leaks
Documentation changes to use https:
Changes to how time stamp calculations are done
Lots of tweaks to make newer compilers happier and warning-free and
to fix instances of C undefined behavior
Warn if AC_PROG_CC_C99 can't enable C99 support
Rename pcap_set_protocol() to pcap_set_protocol_linux().
Align pcap_t private data on an 8-byte boundary.
Fix various error messages
Use 64-bit clean API in dag_findalldevs()
Fix cleaning up after some errors
Work around some ethtool ioctl bugs in newer Linux kernels (GitHub
issue #689)
Add backwards compatibility sections to some man pages (GitHub issue
Fix autotool configuration on AIX and macOS
Don't export bpf_filter_with_aux_data() or struct bpf_aux_data;
they're internal-only and subject to change
Fix pcapng block size checking
On macOS, don't build rpcapd or test programs any fatter than they
need to be
Fix reading of capture statistics for Linux USB
Fix packet size values for Linux USB packets (GitHub issue #808)
Check only VID in VLAN test in filterss (GitHub issue #461)
Fix pcap_list_datalinks on 802.11 devices on macOS
Fix overflows with very large snapshot length in pcap file
Improve parsing of rpcapd configuration file (GitHub issue #767)
Handle systems without strlcpy() or strlcat() better
Fix crashes and other errors with invalid filter expressions
Fix use of uninitialized file descriptor in remote capture
Fix some CMake issues
Fix some divide-by-zero issues with the filter compiler
Work around a GNU libc bug in pcap_nametonetaddr()
Add support for DLT_LINUX_SLL2
Fix handling of the packet-count argument for Myricom SNF devices
Fix --disable-rdma in configure script (GitHub issue #782)
Fix compilation of TurboCap support (GitHub issue #764)
Constify first argument to pcap_findalldevs_ex()
Fix a number of issues when running rpcapd as an inetd-style daemon
Fix CMake issues with D-Bus libraries
In rpcapd, clean up termination of a capture session
Redo remote capture protocol negotiation
In rpcapd, report the same error for "invalid user name" and
"invalid password", to make brute-forcing harder
For remote captures, add an error code for "the server requires TLS"
Fix pcap_dump_fopen() on Windows to avoid clashes between
{Win,N}Pcap and application C runtimes
Fix exporting of functions from Windows DLLs (GitHub issue #810)
Fix building as part of Npcap
Allow rpcapd to rebind more rapidly
Fix building shared libpcap library on midipix (
Fix hack to detect UTF-16LE adapter names on Windows not to go past
the end of the string
Fix handling of "wireless WAN" (mobile phone network modems) on
Windows with WinPcap/Npcap (GitHub issue #824)
Have pcap_dump_open_append() create the dump file if it doesn't
exists (GitHub issue #247)
Fix the maxmum snapshot length for DLT_USBPCAP
Use -fPIC when building for 64-bit SPARC on Linux (GitHub issue #837)
Fix CMake 64-bit library installation directory on some Linux
Boost the TPACKET_V3 timeout to the maximum if a timeout of 0 was
Five CVE-2019-15161, CVE-2019-15162, CVE-2019-15163, CVE-2019-15164, CVE-2019-15165
Fixes for CVE-2018-16301, errors in pcapng reading.
PCAPNG reader applies some sanity checks before doing malloc().
Sunday, June 24, 2018, by
Summary for 1.9.0 libpcap release
Added testing system to libpcap, independent of tcpdump
Changes to how pcap_t is activated
Adding support for Large stream buffers on Endace DAG cards
Changes to BSD 3-clause license to 2-clause licence
Additions to TCP header parsing, per RFC3168
Add CMake build process (extensive number of changes)
Assign a value for OpenBSD DLT_OPENFLOW.
Support setting non-blocking mode before activating.
Extensive build support for Windows VS2010 and MINGW (many many changes, over many months)
Added RPCAPD support when --enable-remote (default no)
Add the rpcap daemon source and build instructions.
Put back the greasy "save the capture filter string so we can tweak it"
hack, that keeps libpcap from capturing rpcap traffic.
Fixes for captures on MacOS, utun0
fixes so that non-AF_INET addresses, are not ==AF_INET6 addresses.
Add a linktype for IBM SDLC frames containing SNA PDUs.
pcap_compile() in 1.8.0 and later is newly thread-safe.
bound snaplen for linux tpacket_v2 to ~64k
Make VLAN filter handle both metadata and inline tags
D-Bus captures can now be up to 128MB in size
Added LORATAP DLT value
Added DLT_VSOCK for
probe_devices() fixes not to overrun buffer for name of device
Add linux-specific pcap_set_protocol_linux() to allow specifying a specific capture protocol.
RDMA sniffing support for pcap
Add Nordic Semiconductor Bluetooth LE sniffer link-layer header type.
fixes for reading /etc/ethers
Make it possible to build on Windows without packet.dll.
Add tests for large file support on UN*X.
Solaris fixes to work with 2.8.6
configuration test now looks for header files, not capture devices present
Fix to work with Berkeley YACC.
fixes for DragonBSD compilation of pcap-netmap.c
Clean up the ether_hostton() stuff.
Add an option to disable Linux memory-mapped capture support.
Add DAG API support checks.
Add Septel, Myricom SNF, and Riverbed TurboCap checks.
Add checks for Linux USB, Linux Bluetooth, D-Bus, and RDMA sniffing support.
Add a check for hardware time stamping on Linux.
Don't bother supporting pre-2005 Visual Studio.
Increased minimum autoconf version requirement to 2.64
Add DLT value 273 for XRA-31 sniffer
Clean up handing of signal interrupts in pcap_read_nocb_remote().
Use the XPG 4.2 versions of the networking APIs in Solaris.
Fix, and better explain, the "IPv6 means IPv6, not IPv4" option setting.
Explicitly warn that negative packet buffer timeouts should not be used.
rpcapd: Add support inetd-likes, including xinetd.conf, and systemd units
Rename DLT_IEEE802_15_4 to DLT_IEEE802_15_4_WITHFCS.
Remove the sunos4 kernel modules and all references to them.
Add more interface flags to pcap_findalldevs().
Summary for 1.9.0 libpcap release (to 2017-01-25 by
Man page improvements
Fix Linux cooked mode userspace filtering (GitHub pull request #429)
Fix compilation if IPv6 support not enabled
This diff is collapsed.
......@@ -25,5 +25,5 @@ Please note that if you know exactly how to solve the problem and the solution
would not be too intrusive, it would be best to contribute some development time
and open a pull request instead.
Still not sure how to do? Feel free to [subscribe](
Still not sure how to do? Feel free to [subscribe](
to the mailing list and ask!
This file lists people who have contributed to libpcap:
This file lists people who have contributed to libpcap.
The current maintainers:
Bill Fenner <fenner at research dot att dot com>
The current maintainers (in alphabetical order):
Denis Ovsienko <denis at ovsienko dot info>
Fulvio Risso <risso at polito dot it>
Francois-Xavier Le Bail <devel dot fx dot lebail at orange dot fr>
Guy Harris <guy at alum dot mit dot edu>
Hannes Gredler <hannes at juniper dot net>
Michael Richardson <mcr at sandelman dot ottawa dot on dot ca>
Francois-Xavier Le Bail <fx dot lebail at yahoo dot com>
Additional people who have contributed patches:
Additional people who have contributed patches (in alphabetical order):
Akos Vandra <axos88 at gmail dot com>
Alan Bawden <Alan at LCS dot MIT dot EDU>
Albert Chin <china at thewrittenword dot com>
Alexander 'Leo' Bergolth <Leo dot Bergolth at wu-wien dot ac dot at>
Alexey Kuznetsov <kuznet at ms2 dot inr dot ac dot ru>
Ali Abdulkadir <autostart dot ini at gmail dot com>
Alon Bar-Lev <alonbl at sourceforge dot net>
Andres Perera <andres dot p at zoho dot com>
Andrew Brown <atatat at atatdot dot net>
......@@ -62,6 +59,7 @@ Additional people who have contributed patches:
Gabor Tatarka <gabor dot tatarka at ericsson dot com>
Garrett Cooper <yaberauneya at sourceforge dot net>
George Neville-Neil <gnn at freebsd dot org>
Gerard Garcia <nouboh at gmail dot com>
Gianluca Varenni <gianluca dot varenni at gmail dot com>
Gilbert Hoyek <gil_hoyek at hotmail dot com>
Gisle Vanem <gvanem at yahoo dot no>
......@@ -99,6 +97,7 @@ Additional people who have contributed patches:
Koryn Grant <koryn at endace dot com>
Kris Katterjohn <katterjohn at gmail dot com>
Krzysztof Halasa <khc at pm dot waw dot pl>
Lennert Buytenhek <buytenh at wantstofly dot org>
Lorenzo Cavallaro <sullivan at sikurezza dot org>
Loris Degioanni <loris at netgroup-serv dot polito dot it>
Love Hörnquist-Åstrand <lha at stacken dot kth dot se>
......@@ -114,6 +113,7 @@ Additional people who have contributed patches:
Márton Németh <nm127 at freemail dot hu>
Matthew Luckie <mjl at luckie dot org dot nz>
Max Laier <max at love2party dot net>
Michal Kubecek <mkubecek at suse dot cz>
Michal Labedzki <michal dot labedzki at tieto dot com>
Michal Sekletar <msekleta at redhat dot com>
Mike Frysinger <vapier at gmail dot com>
......@@ -129,7 +129,7 @@ Additional people who have contributed patches:
Olaf Kirch <okir at caldera dot de>
Ollie Wild <aaw at users dot sourceforge dot net>
Onno van der Linden <onno at simplex dot nl>
Paolo Abeni <paolo dot abeni at email dot it>
Paolo Abeni <pabeni at redhat dot com>
Patrick Marie <mycroft at virgaria dot org>
Patrick McHardy <kaber at trash not net>
Paul Mundt <lethal at linux-sh dot org>
......@@ -145,6 +145,8 @@ Additional people who have contributed patches:
Rick Jones <raj at cup dot hp dot com>
Robert Edmonds <stu-42 at sourceforge dot net>
Roberto Mariani <jelot-tcpdump at jelot dot it>
Rongxi Li <rongxi dot li at chaitin dot com>
Roland Dreier <roland at purestorage dot com>
Romain Francoise <rfrancoise at debian dot org>
Sagun Shakya <sagun dot shakya at sun dot com>
Scott Barron <sb125499 at ohiou dot edu>
......@@ -167,6 +169,7 @@ Additional people who have contributed patches:
Wesley Shields <wxs at FreeBSD dot org>
Xianjie Zhang <xzhang at cup dot hp dot com>
Xin Li <delphij at FreeBSD dot org>
Xue Jiang Qing <xuejianqing at star-net dot cn>
Yen Yen Lim
Yoann Vandoorselaere <yoann at prelude-ids dot org>
Yvan Vanhullebus <vanhu at sourceforge dot net>
......@@ -176,5 +179,8 @@ The original LBL crew:
Craig Leres
Van Jacobson
Past maintainers:
Jun-ichiro itojun Hagino <itojun at iijlab dot net> Also see:
Past maintainers (in alphabetical order):
Bill Fenner <fenner at research dot att dot com>
Fulvio Risso <risso at polito dot it>
Hannes Gredler <hannes at gredler dot at>
Jun-ichiro itojun Hagino <itojun at iijlab dot net> Also see:
......@@ -69,10 +69,6 @@ before /usr/ucb or else:
before running configure. (You might have to do a "make distclean"
if you already ran configure once).
Also note that "make depend" won't work; while all of the known
universe uses -M, the SPARCompiler uses -xM to generate makefile
If you are trying to do packet capture with a FORE ATM card, you may or
may not be able to. They usually only release their driver in object
code so unless their driver supports packet capture, there's not much
......@@ -258,27 +254,26 @@ ChmodBPF/* - macOS startup item to set ownership and permissions
CMakeLists.txt - CMake file
CONTRIBUTING - guidelines for contributing
CREDITS - people that have helped libpcap along
INSTALL.txt - this file - this file
LICENSE - the license under which tcpdump is distributed - compilation rules (input to the configure script)
README - description of distribution
README.aix - notes on using libpcap on AIX
README.dag - notes on using libpcap to capture on Endace DAG devices
README.hpux - notes on using libpcap on HP-UX
README.linux - notes on using libpcap on Linux
README.macos - notes on using libpcap on macOS
README.septel - notes on using libpcap to capture on Intel/Septel devices
README.sita - notes on using libpcap to capture on SITA devices
README.tru64 - notes on using libpcap on Digital/Tru64 UNIX
README.Win32 - notes on using libpcap on Win32 systems (with WinPcap) - description of distribution
doc/README.aix - notes on using libpcap on AIX
doc/README.dag - notes on using libpcap to capture on Endace DAG devices
doc/README.hpux - notes on using libpcap on HP-UX
doc/ - notes on using libpcap on Linux
doc/README.macos - notes on using libpcap on macOS
doc/README.septel - notes on using libpcap to capture on Intel/Septel devices
doc/README.sita - notes on using libpcap to capture on SITA devices
doc/README.tru64 - notes on using libpcap on Digital/Tru64 UNIX
doc/README.Win32 - notes on using libpcap on Win32 systems (with Npcap)
VERSION - version of this release
acconfig.h - support for post-2.13 autoconf
aclocal.m4 - autoconf macros
arcnet.h - ARCNET definitions
atmuni31.h - ATM Q.2931 definitions
bpf/net - copy of bpf_filter.c
bpf_dump.c - BPF program printing routines
bpf_filter.c - symlink to bpf/net/bpf_filter.c
bpf_filter.c - BPF filtering routines
bpf_image.c - BPF disassembly routine
config.guess - autoconf support - autoconf input
......@@ -69,7 +69,7 @@ INSTALL_RPCAPD=@INSTALL_RPCAPD@
# Standard CFLAGS for building members of a shared library
......@@ -117,6 +117,7 @@ PUBHDR = \
pcap/nflog.h \
pcap/pcap.h \
pcap/sll.h \
pcap/socket.h \
pcap/vlan.h \
......@@ -168,6 +169,7 @@ MAN3PCAP_EXPAND = \ \ \ \ \ \
......@@ -203,9 +205,8 @@ MAN3PCAP_NOEXPAND = \
pcap_open_live.3pcap \
pcap_set_buffer_size.3pcap \
pcap_set_datalink.3pcap \
pcap_set_immediate_mode.3pcap \
pcap_set_promisc.3pcap \
pcap_set_protocol.3pcap \
pcap_set_protocol_linux.3pcap \
pcap_set_rfmon.3pcap \
pcap_set_snaplen.3pcap \
pcap_set_timeout.3pcap \
......@@ -235,21 +236,13 @@ EXTRA_DIST = \
ChmodBPF/StartupParameters.plist \
CMakeLists.txt \
INSTALL.txt \ \
Makefile-devel-adds \
README.aix \
README.dag \
README.hpux \
README.linux \
README.macos \
README.septel \
README.sita \
README.tru64 \
README.Win32 \
doc \ \
aclocal.m4 \
......@@ -284,10 +277,14 @@ EXTRA_DIST = \
lbl/os-sunos4.h \
lbl/os-ultrix4.h \ \
missing/asprintf.c \
missing/getopt.c \
missing/getopt.h \
missing/snprintf.c \
missing/strlcat.c \
missing/strlcpy.c \
missing/strtok_r.c \
missing/win_asprintf.c \
missing/win_snprintf.c \
mkdep \
msdos/bin2c.c \
......@@ -355,16 +352,18 @@ EXTRA_DIST = \
rpcapd/fileconf.c \
rpcapd/fileconf.h \
rpcapd/log.h \
rpcapd/log-stderr.c \
rpcapd/log.c \
rpcapd/org.tcpdump.rpcapd.plist \
rpcapd/rpcapd.c \
rpcapd/rpcapd.h \
rpcapd/rpcapd.inetd.conf \
rpcapd/ \
rpcapd/ \
rpcapd/rpcapd.rc \
rpcapd/rpcapd.socket \
rpcapd/rpcapd.xinetd.conf \
rpcapd/rpcapd@.service \
rpcapd/win32-svc.c \
rpcapd/win32-svc.h \
sockutils.c \
sockutils.h \
......@@ -424,7 +423,7 @@ libpcap.dylib: $(OBJ)
CURRENT_VER=`sed 's/[^0-9.].*$$//' $(srcdir)/VERSION`; \
$(CC) -dynamiclib -undefined error $(LDFLAGS) \
$(CC) -dynamiclib -undefined error $(LDFLAGS) @V_LIB_LDFLAGS_FAT@ \
-o libpcap.$$VER.dylib $(OBJ) $(ADDLOBJS) $(LIBS) \
-install_name $(libdir)/libpcap.$$MAJOR_VER.dylib \
-compatibility_version $$COMPAT_VER \
......@@ -496,9 +495,18 @@ grammar.o: grammar.c scanner.h
gencode.o: $(srcdir)/gencode.c grammar.h scanner.h
$(CC) $(FULL_CFLAGS) -c $(srcdir)/gencode.c
asprintf.o: $(srcdir)/missing/asprintf.c
$(CC) $(FULL_CFLAGS) -o $@ -c $(srcdir)/missing/asprintf.c
snprintf.o: $(srcdir)/missing/snprintf.c
$(CC) $(FULL_CFLAGS) -o $@ -c $(srcdir)/missing/snprintf.c
strlcat.o: $(srcdir)/missing/strlcat.c
$(CC) $(FULL_CFLAGS) -o $@ -c $(srcdir)/missing/strlcat.c
strlcpy.o: $(srcdir)/missing/strlcpy.c
$(CC) $(FULL_CFLAGS) -o $@ -c $(srcdir)/missing/strlcpy.c
strtok_r.o: $(srcdir)/missing/strtok_r.c
$(CC) $(FULL_CFLAGS) -o $@ -c $(srcdir)/missing/strtok_r.c
......@@ -582,6 +590,9 @@ install: install-shared install-archive libpcap.pc pcap-config @INSTALL_RPCAPD@
rm -f pcap_datalink_val_to_description.3pcap && \
$(LN_S) pcap_datalink_val_to_name.3pcap \
pcap_datalink_val_to_description.3pcap && \
rm -f pcap_datalink_val_to_description_or_dlt.3pcap && \
$(LN_S) pcap_datalink_val_to_name.3pcap \
pcap_datalink_val_to_description_or_dlt.3pcap && \
rm -f pcap_dump_fopen.3pcap && \
$(LN_S) pcap_dump_open.3pcap pcap_dump_fopen.3pcap && \
rm -f pcap_freealldevs.3pcap && \
......@@ -751,7 +762,7 @@ tags: $(TAGFILES)
@cwd=`pwd` ; dir=`basename $$cwd` ; name=$(PROG)-`cat VERSION` ; \
mkdir $$name; \
tar cf - $(CSRC) $(HDR) $(MAN1) $(MAN3PCAP_EXPAND) \
tar -c --exclude='*~' -f - $(CSRC) $(HDR) $(MAN1) $(MAN3PCAP_EXPAND) \
(cd $$name; tar xf -); \
tar -c -z -f $$name.tar.gz $$name; \
Under Win32, libpcap is integrated in the WinPcap packet capture system.
WinPcap provides a framework that allows libpcap to capture the packets
under Windows 95, Windows 98, Windows ME, Windows NT 4, Windows 2000
and Windows XP.
WinPcap binaries and source code can be found at
they include also a developer's pack with all the necessary to compile
libpcap-based applications under Windows.
How to compile libpcap with Visual Studio
In order to compile libpcap you will need:
- version 6 (or higher) of Microsoft Visual Studio
- The November 2001 (or later) edition of Microsoft Platform
Software Development Kit (SDK), that contains some necessary includes
for IPv6 support. You can download it from
- the latest WinPcap sources from
The WinPcap source code already contains a recent (usually the latest
stable) version of libpcap. If you need to compile a different one,
simply download it from and copy the sources in the
winpcap\wpcap\libpcap folder of the WinPcap distribution. If you want to
compile a libpcap source retrieved from the Git, you will
have to create the scanner and the grammar by hand (with lex and yacc)
or with the cygnus makefile, since The Visual Studio project is not able
to build them.
Open the project file winpcap\wpcap\prj\wpcap.dsw with Visual Studio and
build wpcap.dll. wpcap.lib, the library file to link with the applications,
will be generated in winpcap\wpcap\lib\. wpcap.dll will be generated in
winpcap\wpcap\prj\release or winpcap\wpcap\prj\debug depending on the type
of binary that is being created.
How to compile libpcap with Cygnus
To build wpcap.dll, cd to the directory WPCAP/PRJ of the WinPcap source code
distribution and type "make". libwpcap.a, the library file to link with the
applications, will be generated in winpcap\wpcap\lib\. wpcap.dll will be
generated in winpcap\wpcap\prj.
Remember, you CANNOT use the MSVC-generated .lib files with gcc, use
libwpcap.a instead.
"make install" installs wpcap.dll in the Windows system folder.
......@@ -2,14 +2,17 @@ To report a security issue please send an e-mail to
To report bugs and other problems, contribute patches, request a
feature, provide generic feedback etc please see the file
CONTRIBUTING in the libpcap source tree root.
[CONTRIBUTING]( in the libpcap source tree root.
The directory doc/ has README files about specific operating systems and
Now maintained by "The Tcpdump Group"
Anonymous Git is available via:
git clone git://
formerly from Lawrence Berkeley National Laboratory
Network Research Group <>
......@@ -67,9 +70,10 @@ kernel source and/or object patches available in:
Linux, in the 2.2 kernel and later kernels, has a "Socket Filter"
mechanism that accepts BPF filters; see the README.linux file for
information on configuring that option.
Linux has a number of BPF based systems, and libpcap does not support
any of the eBPF mechanisms as yet, although it supports many of the
memory mapped receive mechanisms.
See the [README.linux](doc/ file for more information.
Note to Linux distributions and *BSD systems that include libpcap:
......@@ -266,6 +266,14 @@ dnl Check whether the compiler option specified as the second argument
dnl is supported by the compiler and, if so, add it to the macro
dnl specified as the first argument
dnl If a third argument is supplied, treat it as C code to be compiled
dnl with the flag in question, and the "treat warnings as errors" flag
dnl set, and don't add the flag to the first argument if the compile
dnl fails; this is for warning options cause problems that can't be
dnl worked around. If a third argument is supplied, a fourth argument
dnl should also be supplied; it's a message desribing what the test
dnl program is checking.
AC_MSG_CHECKING([whether the compiler supports the $2 option])
......@@ -287,8 +295,38 @@ AC_DEFUN(AC_LBL_CHECK_COMPILER_OPT,
[return 0],
# The compile supports this; do we have some C code for
# which the warning should *not* appear?
# We test the fourth argument because the third argument
# could contain quotes, breaking the test.
if test "x$4" != "x"
CFLAGS="$CFLAGS $ac_lbl_cc_force_warning_errors"
AC_MSG_CHECKING(whether $2 $4)
# Not a problem.
# A problem.
$1="$$1 $2"
if test x"$can_add_to_cflags" = "xyes"
$1="$$1 $2"
......@@ -446,7 +484,7 @@ AC_DEFUN(AC_LBL_SHLIBS_INIT,
# Platforms where the linker is the GNU linker
# or accepts command-line arguments like
......@@ -463,7 +501,7 @@ AC_DEFUN(AC_LBL_SHLIBS_INIT,
case "$host_os" in
......@@ -840,23 +878,58 @@ AC_DEFUN(AC_LBL_DEVEL,
if test "$ac_lbl_cc_dont_try_gcc_dashW" != yes; then
AC_LBL_CHECK_COMPILER_OPT($1, -Wsign-compare)
AC_LBL_CHECK_COMPILER_OPT($1, -Wmissing-prototypes)
AC_LBL_CHECK_COMPILER_OPT($1, -Wstrict-prototypes)
AC_LBL_CHECK_COMPILER_OPT($1, -Wdeclaration-after-statement)
AC_LBL_CHECK_COMPILER_OPT($1, -Wused-but-marked-unused)
AC_LBL_CHECK_COMPILER_OPT($1, -Wdocumentation)
AC_LBL_CHECK_COMPILER_OPT($1, -Wformat-nonliteral)
AC_LBL_CHECK_COMPILER_OPT($1, -Wmissing-noreturn)
AC_LBL_CHECK_COMPILER_OPT($1, -Wmissing-prototypes)
AC_LBL_CHECK_COMPILER_OPT($1, -Wmissing-variable-declarations)
AC_LBL_CHECK_COMPILER_OPT($1, -Wsign-compare)
AC_LBL_CHECK_COMPILER_OPT($1, -Wstrict-prototypes)
AC_LBL_CHECK_COMPILER_OPT($1, -Wunused-parameter)
AC_LBL_CHECK_COMPILER_OPT($1, -Wused-but-marked-unused)
# Warns about safeguards added in case the enums are
# extended
# AC_LBL_CHECK_COMPILER_OPT($1, -Wcovered-switch-default)
AC_LBL_CHECK_COMPILER_OPT($1, -Wmissing-variable-declarations)
AC_LBL_CHECK_COMPILER_OPT($1, -Wunused-parameter)
AC_LBL_CHECK_COMPILER_OPT($1, -Wformat-nonliteral)
AC_LBL_CHECK_COMPILER_OPT($1, -Wunreachable-code)
# This can cause problems with ntohs(), ntohl(),
# htons(), and htonl() on some platforms, such
# as OpenBSD 6.3 with Clang 5.0.1. I guess the
# problem is that the macro that ultimately does
# the byte-swapping involves a conditional
# expression that tests whether the value being
# swapped is a compile-time constant or not,
# using __builtin_constant_p(), and, depending
# on whether it is, does a compile-time swap or
# a run-time swap; perhaps the compiler always
# considers one of the two results of the
# conditional expressin is never evaluated,
# because the conditional check is done at
# compile time, and thus always says "that
# expression is never executed".
# (Perhaps there should be a way of flagging
# an expression that you *want* evaluated at
# compile time, so that the compiler 1) warns
# if it *can't* be evaluated at compile time
# and 2) *doesn't* warn that the true or false
# branch will never be reached.)
AC_LBL_CHECK_COMPILER_OPT($1, -Wunreachable-code,
#include <arpa/inet.h>
unsigned short
testme(unsigned short a)
return ntohs(a);
[generates warnings from ntohs()])
......@@ -51,7 +51,7 @@
#include <sys/time.h>
#endif /* _WIN32 */
#include <pcap/bpf.h>
#include <pcap-int.h>
#include <stdlib.h>
......@@ -328,11 +328,17 @@ bpf_filter_with_aux_data(const struct bpf_insn *pc, const u_char *p,
A <<= X;
if (X < 32)
A <<= X;