mirror of
https://github.com/the-tcpdump-group/tcpdump.git
synced 2024-12-03 23:13:36 +08:00
6df678ca31
The documentation claims that recent GCC is now better by default at spotting cases of code flow falling through (which is true) and that it avoids false positives by matching nearby source code comments with regexps. However, the latter feature doesn't seem to work as reliably as the manual describes it, so let's have a macro for this purpose. Tested to work on: * x86_64, Fedora 26, GCC 7.1.1 (w/__attribute__, w/fallthrough) * x86_64, Ubuntu 16.04, GCC 5.4.0 (w/__attribute__, w/o fallthrough) * x86_64, FreeBSD 11.0, CLang 3.8.0 (w/__attribute__, w/o fallthrough) * SPARC, Solaris 10, SolStudio 12.4 (w/__attribute__, w/o fallthrough) * SPARC, Solaris 10, SunStudio 11 (w/o __attribute__)
411 lines
10 KiB
C
411 lines
10 KiB
C
/*
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* Copyright (c) 2002 - 2003
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* NetGroup, Politecnico di Torino (Italy)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Politecnico di Torino nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Include the appropriate OS header files on Windows and various flavors
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* of UNIX, include various non-OS header files on Windows, and define
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* various items as needed, to isolate most of netdissect's platform
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* differences to this one file.
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*/
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#ifndef netdissect_stdinc_h
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#define netdissect_stdinc_h
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#include <errno.h>
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#ifdef _WIN32
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/*
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* Includes and definitions for Windows.
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*/
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#include <stdint.h>
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#include <stdio.h>
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#include <winsock2.h>
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#include <ws2tcpip.h>
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#include <ctype.h>
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#include <time.h>
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#include <io.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#ifndef uint8_t
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#define uint8_t unsigned char
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#endif
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#ifndef int8_t
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#define int8_t signed char
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#endif
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#ifndef uint16_t
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#define uint16_t unsigned short
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#endif
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#ifndef int16_t
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#define int16_t signed short
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#endif
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#ifndef uint32_t
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#define uint32_t unsigned int
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#endif
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#ifndef int32_t
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#define int32_t signed int
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#endif
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#ifdef _MSC_EXTENSIONS
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#ifndef uint64_t
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#define uint64_t unsigned _int64
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#endif
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#ifndef int64_t
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#define int64_t _int64
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#endif
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#ifndef PRId64
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#define PRId64 "I64d"
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#endif
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#ifndef PRIo64
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#define PRIo64 "I64o"
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#endif
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#ifndef PRIu64
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#define PRIu64 "I64u"
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#endif
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#ifndef PRIx64
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#define PRIx64 "I64x"
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#endif
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#else /* _MSC_EXTENSIONS */
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#ifndef uint64_t
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#define uint64_t unsigned long long
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#endif
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#ifndef int64_t
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#define int64_t long long
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#endif
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#ifndef PRId64
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#define PRId64 "lld"
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#endif
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#ifndef PRIo64
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#define PRIo64 "llo"
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#endif
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#ifndef PRIu64
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#define PRIu64 "llu"
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#endif
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#ifndef PRIx64
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#define PRIx64 "llx"
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#endif
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#endif /* _MSC_EXTENSIONS */
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/*
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* Suppress definition of intN_t in bittypes.h, as included by <pcap/pcap.h>
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* on Windows.
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* (Yes, HAVE_U_INTn_T, as the definition guards are UN*X-oriented, and
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* we check for u_intN_t in the UN*X configure script.)
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*/
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#define HAVE_U_INT8_T
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#define HAVE_U_INT16_T
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#define HAVE_U_INT32_T
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#define HAVE_U_INT64_T
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#ifdef _MSC_VER
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#define stat _stat
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#define open _open
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#define fstat _fstat
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#define read _read
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#define close _close
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#define O_RDONLY _O_RDONLY
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#endif /* _MSC_VER */
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/*
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* With MSVC, for C, __inline is used to make a function an inline.
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*/
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#ifdef _MSC_VER
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#define inline __inline
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#endif
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#ifdef AF_INET6
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#define HAVE_OS_IPV6_SUPPORT
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#endif
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#ifndef INET6_ADDRSTRLEN
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#define INET6_ADDRSTRLEN 46
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#endif
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/* It is in MSVC's <errno.h>, but not defined in MingW+Watcom.
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*/
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#ifndef EAFNOSUPPORT
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#define EAFNOSUPPORT WSAEAFNOSUPPORT
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#endif
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#ifndef caddr_t
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typedef char* caddr_t;
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#endif /* caddr_t */
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#define MAXHOSTNAMELEN 64
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#define snprintf _snprintf
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#define vsnprintf _vsnprintf
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#define RETSIGTYPE void
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#else /* _WIN32 */
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/*
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* Includes and definitions for various flavors of UN*X.
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*/
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#include <ctype.h>
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#include <unistd.h>
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#include <netdb.h>
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#if HAVE_INTTYPES_H
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#include <inttypes.h>
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#elif HAVE_STDINT_H
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#include <stdint.h>
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#endif
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#include <sys/param.h>
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#include <sys/types.h> /* concession to AIX */
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#ifdef TIME_WITH_SYS_TIME
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#include <time.h>
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#endif
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#include <arpa/inet.h>
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#endif /* _WIN32 */
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#ifndef HAVE___ATTRIBUTE__
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#define __attribute__(x)
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#endif
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/*
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* Used to declare a structure unaligned, so that the C compiler,
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* if necessary, generates code that doesn't assume alignment.
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* This is required because there is no guarantee that the packet
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* data we get from libpcap/WinPcap is properly aligned.
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*
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* This assumes that, for all compilers that support __attribute__:
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*
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* 1) they support __attribute__((packed));
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*
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* 2) for all instruction set architectures requiring strict
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* alignment, declaring a structure with that attribute
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* causes the compiler to generate code that handles
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* misaligned 2-byte, 4-byte, and 8-byte integral
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* quantities.
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*
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* It does not (yet) handle compilers where you can get the compiler
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* to generate code of that sort by some other means.
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*
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* This is required in order to, for example, keep the compiler from
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* generating, for
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*
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* if (bp->bp_htype == 1 && bp->bp_hlen == 6 && bp->bp_op == BOOTPREQUEST) {
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*
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* in print-bootp.c, code that loads the first 4-byte word of a
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* "struct bootp", masking out the bp_hops field, and comparing the result
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* against 0x01010600.
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*
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* Note: this also requires that padding be put into the structure,
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* at least for compilers where it's implemented as __attribute__((packed)).
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*/
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#if !(defined(_MSC_VER) && defined(UNALIGNED))
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/* MSVC may have its own macro defined with the same name and purpose. */
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#undef UNALIGNED
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#define UNALIGNED __attribute__((packed))
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#endif
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/*
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* fopen() read and write modes for text files and binary files.
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*/
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#if defined(_WIN32) || defined(MSDOS)
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#define FOPEN_READ_TXT "rt"
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#define FOPEN_READ_BIN "rb"
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#define FOPEN_WRITE_TXT "wt"
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#define FOPEN_WRITE_BIN "wb"
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#else
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#define FOPEN_READ_TXT "r"
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#define FOPEN_READ_BIN FOPEN_READ_TXT
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#define FOPEN_WRITE_TXT "w"
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#define FOPEN_WRITE_BIN FOPEN_WRITE_TXT
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#endif
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/*
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* Inline x86 assembler-language versions of ntoh[ls]() and hton[ls](),
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* defined if the OS doesn't provide them. These assume no more than
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* an 80386, so, for example, it avoids the bswap instruction added in
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* the 80486.
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*
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* (We don't use them on OS X; Apple provides their own, which *doesn't*
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* avoid the bswap instruction, as OS X only supports machines that
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* have it.)
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*/
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#if defined(__GNUC__) && defined(__i386__) && !defined(__APPLE__) && !defined(__ntohl)
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#undef ntohl
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#undef ntohs
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#undef htonl
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#undef htons
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static __inline__ unsigned long __ntohl (unsigned long x);
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static __inline__ unsigned short __ntohs (unsigned short x);
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#define ntohl(x) __ntohl(x)
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#define ntohs(x) __ntohs(x)
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#define htonl(x) __ntohl(x)
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#define htons(x) __ntohs(x)
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static __inline__ unsigned long __ntohl (unsigned long x)
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{
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__asm__ ("xchgb %b0, %h0\n\t" /* swap lower bytes */
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"rorl $16, %0\n\t" /* swap words */
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"xchgb %b0, %h0" /* swap higher bytes */
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: "=q" (x) : "0" (x));
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return (x);
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}
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static __inline__ unsigned short __ntohs (unsigned short x)
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{
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__asm__ ("xchgb %b0, %h0" /* swap bytes */
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: "=q" (x) : "0" (x));
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return (x);
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}
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#endif
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/*
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* If the OS doesn't define AF_INET6 and struct in6_addr:
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*
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* define AF_INET6, so we can use it internally as a "this is an
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* IPv6 address" indication;
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*
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* define struct in6_addr so that we can use it for IPv6 addresses.
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*/
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#ifndef HAVE_OS_IPV6_SUPPORT
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#ifndef AF_INET6
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#define AF_INET6 24
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struct in6_addr {
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union {
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__uint8_t __u6_addr8[16];
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__uint16_t __u6_addr16[8];
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__uint32_t __u6_addr32[4];
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} __u6_addr; /* 128-bit IP6 address */
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};
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#endif
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#endif
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#ifndef NI_MAXHOST
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#define NI_MAXHOST 1025
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#endif
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#ifndef INET_ADDRSTRLEN
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#define INET_ADDRSTRLEN 16
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#endif
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#ifndef TRUE
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#define TRUE 1
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#endif
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#ifndef FALSE
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#define FALSE 0
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#endif
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/*
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* The Apple deprecation workaround macros below were adopted from the
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* FreeRADIUS server code under permission of Alan DeKok and Arran Cudbard-Bell.
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*/
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#define XSTRINGIFY(x) #x
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/*
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* Macros for controlling warnings in GCC >= 4.2 and clang >= 2.8
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*/
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#define DIAG_JOINSTR(x,y) XSTRINGIFY(x ## y)
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#define DIAG_DO_PRAGMA(x) _Pragma (#x)
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#if defined(__GNUC__) && ((__GNUC__ * 100) + __GNUC_MINOR__) >= 402
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# define DIAG_PRAGMA(x) DIAG_DO_PRAGMA(GCC diagnostic x)
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# if ((__GNUC__ * 100) + __GNUC_MINOR__) >= 406
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# define DIAG_OFF(x) DIAG_PRAGMA(push) DIAG_PRAGMA(ignored DIAG_JOINSTR(-W,x))
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# define DIAG_ON(x) DIAG_PRAGMA(pop)
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# else
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# define DIAG_OFF(x) DIAG_PRAGMA(ignored DIAG_JOINSTR(-W,x))
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# define DIAG_ON(x) DIAG_PRAGMA(warning DIAG_JOINSTR(-W,x))
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# endif
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#elif defined(__clang__) && ((__clang_major__ * 100) + __clang_minor__ >= 208)
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# define DIAG_PRAGMA(x) DIAG_DO_PRAGMA(clang diagnostic x)
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# define DIAG_OFF(x) DIAG_PRAGMA(push) DIAG_PRAGMA(ignored DIAG_JOINSTR(-W,x))
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# define DIAG_ON(x) DIAG_PRAGMA(pop)
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#else
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# define DIAG_OFF(x)
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# define DIAG_ON(x)
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#endif
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/*
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* For dealing with APIs which are only deprecated in OSX (like the OpenSSL API)
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*/
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#ifdef __APPLE__
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# define USES_APPLE_DEPRECATED_API DIAG_OFF(deprecated-declarations)
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# define USES_APPLE_RST DIAG_ON(deprecated-declarations)
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#else
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# define USES_APPLE_DEPRECATED_API
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# define USES_APPLE_RST
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#endif
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/*
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* end of Apple deprecation workaround macros
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*/
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#ifndef min
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#define min(a,b) ((a)>(b)?(b):(a))
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#endif
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#ifndef max
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#define max(a,b) ((b)>(a)?(b):(a))
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#endif
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#ifdef __ATTRIBUTE___FALLTHROUGH_OK
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# define ND_FALL_THROUGH __attribute__ ((fallthrough))
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#else
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# define ND_FALL_THROUGH
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#endif /* __ATTRIBUTE___FALLTHROUGH_OK */
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#endif /* netdissect_stdinc_h */
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