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Member "tcpdump-4.99.1/./netdissect-stdinc.h" (7 Jun 2021, 12194 Bytes) of package /linux/misc/tcpdump-4.99.1.tar.gz:


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    1 /*
    2  * Copyright (c) 2002 - 2003
    3  * NetGroup, Politecnico di Torino (Italy)
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  *
   10  * 1. Redistributions of source code must retain the above copyright
   11  * notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  * notice, this list of conditions and the following disclaimer in the
   14  * documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the Politecnico di Torino nor the names of its
   16  * contributors may be used to endorse or promote products derived from
   17  * this software without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   30  */
   31 
   32 /*
   33  * Include the appropriate OS header files on Windows and various flavors
   34  * of UNIX, include various non-OS header files on Windows, and define
   35  * various items as needed, to isolate most of netdissect's platform
   36  * differences to this one file.
   37  */
   38 
   39 #ifndef netdissect_stdinc_h
   40 #define netdissect_stdinc_h
   41 
   42 #include "ftmacros.h"
   43 
   44 #include <errno.h>
   45 
   46 #include "compiler-tests.h"
   47 
   48 #include "varattrs.h"
   49 
   50 /*
   51  * If we're compiling with Visual Studio, make sure we have at least
   52  * VS 2015 or later, so we have sufficient C99 support.
   53  *
   54  * XXX - verify that we have at least C99 support on UN*Xes?
   55  *
   56  * What about MinGW or various DOS toolchains?  We're currently assuming
   57  * sufficient C99 support there.
   58  */
   59 #if defined(_MSC_VER)
   60   /*
   61    * Make sure we have VS 2015 or later.
   62    */
   63   #if _MSC_VER < 1900
   64     #error "Building tcpdump requires VS 2015 or later"
   65   #endif
   66 #endif
   67 
   68 /*
   69  * Get the C99 types, and the PRI[doux]64 format strings, defined.
   70  */
   71 #ifdef HAVE_PCAP_PCAP_INTTYPES_H
   72   /*
   73    * We have pcap/pcap-inttypes.h; use that, as it'll do all the
   74    * work, and won't cause problems if a file includes this file
   75    * and later includes a pcap header file that also includes
   76    * pcap/pcap-inttypes.h.
   77    */
   78   #include <pcap/pcap-inttypes.h>
   79 #else
   80   /*
   81    * OK, we don't have pcap/pcap-inttypes.h, so we'll have to
   82    * do the work ourselves, but at least we don't have to
   83    * worry about other headers including it and causing
   84    * clashes.
   85    */
   86 
   87   /*
   88    * Include <inttypes.h> to get the integer types and PRi[doux]64 values
   89    * defined.
   90    *
   91    * If the compiler is MSVC, we require VS 2015 or newer, so we
   92    * have <inttypes.h> - and support for %zu in the formatted
   93    * printing functions.
   94    *
   95    * If the compiler is MinGW, we assume we have <inttypes.h> - and
   96    * support for %zu in the formatted printing functions.
   97    *
   98    * If the target is UN*X, we assume we have a C99-or-later development
   99    * environment, and thus have <inttypes.h> - and support for %zu in
  100    * the formatted printing functions.
  101    *
  102    * If the target is MS-DOS, we assume we have <inttypes.h> - and support
  103    * for %zu in the formatted printing functions.
  104    */
  105   #include <inttypes.h>
  106 
  107   #if defined(_MSC_VER)
  108     /*
  109      * Suppress definition of intN_t in bittypes.h, which might be included
  110      * by <pcap/pcap.h> in older versions of WinPcap.
  111      * (Yes, HAVE_U_INTn_T, as the definition guards are UN*X-oriented.)
  112      */
  113     #define HAVE_U_INT8_T
  114     #define HAVE_U_INT16_T
  115     #define HAVE_U_INT32_T
  116     #define HAVE_U_INT64_T
  117   #endif
  118 #endif /* HAVE_PCAP_PCAP_INTTYPES_H */
  119 
  120 #ifdef _WIN32
  121 
  122 /*
  123  * Includes and definitions for Windows.
  124  */
  125 
  126 #include <stdio.h>
  127 #include <winsock2.h>
  128 #include <ws2tcpip.h>
  129 #include <time.h>
  130 #include <io.h>
  131 #include <fcntl.h>
  132 #include <sys/types.h>
  133 
  134 #ifdef _MSC_VER
  135   /*
  136    * Compiler is MSVC.
  137    *
  138    * We require VS 2015 or newer, so we have strtoll().  Use that for
  139    * strtoint64_t().
  140    */
  141   #define strtoint64_t  strtoll
  142 
  143   /*
  144    * And we have LL as a suffix for constants, so use that.
  145    */
  146   #define INT64_T_CONSTANT(constant)    (constant##LL)
  147 #else
  148   /*
  149    * Non-Microsoft compiler.
  150    *
  151    * XXX - should we use strtoll or should we use _strtoi64()?
  152    */
  153   #define strtoint64_t      strtoll
  154 
  155   /*
  156    * Assume LL works.
  157    */
  158   #define INT64_T_CONSTANT(constant)    (constant##LL)
  159 #endif
  160 
  161 #ifdef _MSC_VER
  162   /*
  163    * Microsoft tries to avoid polluting the C namespace with UN*Xisms,
  164    * by adding a preceding underscore; we *want* the UN*Xisms, so add
  165    * #defines to let us use them.
  166    */
  167   #define isatty _isatty
  168   #define stat _stat
  169   #define strdup _strdup
  170   #define open _open
  171   #define read _read
  172   #define close _close
  173   #define O_RDONLY _O_RDONLY
  174 
  175   /*
  176    * We define our_fstat64 as _fstati64, and define our_statb as
  177    * struct _stati64, so we get 64-bit file sizes.
  178    */
  179   #define our_fstat _fstati64
  180   #define our_statb struct _stati64
  181 
  182   /*
  183    * If <crtdbg.h> has been included, and _DEBUG is defined, and
  184    * __STDC__ is zero, <crtdbg.h> will define strdup() to call
  185    * _strdup_dbg().  So if it's already defined, don't redefine
  186    * it.
  187    */
  188   #ifndef strdup
  189     #define strdup _strdup
  190   #endif
  191 
  192   /*
  193    * Windows doesn't have ssize_t; routines such as _read() return int.
  194    */
  195   typedef int ssize_t;
  196 #endif  /* _MSC_VER */
  197 
  198 /*
  199  * With MSVC, for C, __inline is used to make a function an inline.
  200  */
  201 #ifdef _MSC_VER
  202 #define inline __inline
  203 #endif
  204 
  205 #if defined(AF_INET6) && !defined(HAVE_OS_IPV6_SUPPORT)
  206 #define HAVE_OS_IPV6_SUPPORT
  207 #endif
  208 
  209 #ifndef INET6_ADDRSTRLEN
  210 #define INET6_ADDRSTRLEN 46
  211 #endif
  212 
  213 /* It is in MSVC's <errno.h>, but not defined in MingW+Watcom.
  214  */
  215 #ifndef EAFNOSUPPORT
  216 #define EAFNOSUPPORT WSAEAFNOSUPPORT
  217 #endif
  218 
  219 #ifndef caddr_t
  220 typedef char* caddr_t;
  221 #endif /* caddr_t */
  222 
  223 #define MAXHOSTNAMELEN  64
  224 
  225 #else /* _WIN32 */
  226 
  227 /*
  228  * Includes and definitions for various flavors of UN*X.
  229  */
  230 
  231 #include <unistd.h>
  232 #include <netdb.h>
  233 #include <sys/param.h>
  234 #include <sys/types.h>          /* concession to AIX */
  235 #include <sys/time.h>
  236 #include <sys/socket.h>
  237 #include <netinet/in.h>
  238 
  239 #include <time.h>
  240 
  241 #include <arpa/inet.h>
  242 
  243 /*
  244  * We should have large file support enabled, if it's available,
  245  * so just use fstat as our_fstat and struct stat as our_statb.
  246  */
  247 #define our_fstat fstat
  248 #define our_statb struct stat
  249 
  250 /*
  251  * Assume all UN*Xes have strtoll(), and use it for strtoint64_t().
  252  */
  253 #define strtoint64_t    strtoll
  254 
  255 /*
  256  * Assume LL works.
  257  */
  258 #define INT64_T_CONSTANT(constant)  (constant##LL)
  259 #endif /* _WIN32 */
  260 
  261 /*
  262  * Function attributes, for various compilers.
  263  */
  264 #include "funcattrs.h"
  265 
  266 /*
  267  * fopen() read and write modes for text files and binary files.
  268  */
  269 #if defined(_WIN32) || defined(MSDOS)
  270   #define FOPEN_READ_TXT   "rt"
  271   #define FOPEN_READ_BIN   "rb"
  272   #define FOPEN_WRITE_TXT  "wt"
  273   #define FOPEN_WRITE_BIN  "wb"
  274 #else
  275   #define FOPEN_READ_TXT   "r"
  276   #define FOPEN_READ_BIN   FOPEN_READ_TXT
  277   #define FOPEN_WRITE_TXT  "w"
  278   #define FOPEN_WRITE_BIN  FOPEN_WRITE_TXT
  279 #endif
  280 
  281 /*
  282  * Inline x86 assembler-language versions of ntoh[ls]() and hton[ls](),
  283  * defined if the OS doesn't provide them.  These assume no more than
  284  * an 80386, so, for example, it avoids the bswap instruction added in
  285  * the 80486.
  286  *
  287  * (We don't use them on macOS; Apple provides their own, which *doesn't*
  288  * avoid the bswap instruction, as macOS only supports machines that
  289  * have it.)
  290  */
  291 #if defined(__GNUC__) && defined(__i386__) && !defined(__APPLE__) && !defined(__ntohl)
  292   #undef ntohl
  293   #undef ntohs
  294   #undef htonl
  295   #undef htons
  296 
  297   static __inline__ unsigned long __ntohl (unsigned long x);
  298   static __inline__ unsigned short __ntohs (unsigned short x);
  299 
  300   #define ntohl(x)  __ntohl(x)
  301   #define ntohs(x)  __ntohs(x)
  302   #define htonl(x)  __ntohl(x)
  303   #define htons(x)  __ntohs(x)
  304 
  305   static __inline__ unsigned long __ntohl (unsigned long x)
  306   {
  307     __asm__ ("xchgb %b0, %h0\n\t"   /* swap lower bytes  */
  308              "rorl  $16, %0\n\t"    /* swap words        */
  309              "xchgb %b0, %h0"       /* swap higher bytes */
  310             : "=q" (x) : "0" (x));
  311     return (x);
  312   }
  313 
  314   static __inline__ unsigned short __ntohs (unsigned short x)
  315   {
  316     __asm__ ("xchgb %b0, %h0"       /* swap bytes */
  317             : "=q" (x) : "0" (x));
  318     return (x);
  319   }
  320 #endif
  321 
  322 /*
  323  * If the OS doesn't define AF_INET6 and struct in6_addr:
  324  *
  325  * define AF_INET6, so we can use it internally as a "this is an
  326  * IPv6 address" indication;
  327  *
  328  * define struct in6_addr so that we can use it for IPv6 addresses.
  329  */
  330 #ifndef HAVE_OS_IPV6_SUPPORT
  331 #ifndef AF_INET6
  332 #define AF_INET6    24
  333 
  334 struct in6_addr {
  335     union {
  336         __uint8_t   __u6_addr8[16];
  337         __uint16_t  __u6_addr16[8];
  338         __uint32_t  __u6_addr32[4];
  339     } __u6_addr;            /* 128-bit IP6 address */
  340 };
  341 #endif
  342 #endif
  343 
  344 #ifndef NI_MAXHOST
  345 #define NI_MAXHOST  1025
  346 #endif
  347 
  348 #ifndef INET_ADDRSTRLEN
  349 #define INET_ADDRSTRLEN 16
  350 #endif
  351 
  352 #ifndef TRUE
  353 #define TRUE 1
  354 #endif
  355 
  356 #ifndef FALSE
  357 #define FALSE 0
  358 #endif
  359 
  360 /*
  361  * The Apple deprecation workaround macros below were adopted from the
  362  * FreeRADIUS server code under permission of Alan DeKok and Arran Cudbard-Bell.
  363  */
  364 
  365 #define XSTRINGIFY(x) #x
  366 
  367 /*
  368  *  Macros for controlling warnings in GCC >= 4.2 and clang >= 2.8
  369  */
  370 #define DIAG_JOINSTR(x,y) XSTRINGIFY(x ## y)
  371 #define DIAG_DO_PRAGMA(x) _Pragma (#x)
  372 
  373 /*
  374  * The current clang compilers also define __GNUC__ and __GNUC_MINOR__
  375  * thus we need to test the clang case before the GCC one
  376  */
  377 #if defined(__clang__)
  378 #  if (__clang_major__ * 100) + __clang_minor__ >= 208
  379 #    define DIAG_PRAGMA(x) DIAG_DO_PRAGMA(clang diagnostic x)
  380 #    define DIAG_OFF(x) DIAG_PRAGMA(push) DIAG_PRAGMA(ignored DIAG_JOINSTR(-W,x))
  381 #    define DIAG_ON(x) DIAG_PRAGMA(pop)
  382 #  else
  383 #    define DIAG_OFF(x)
  384 #    define DIAG_ON(x)
  385 #  endif
  386 #elif defined(__GNUC__) && ((__GNUC__ * 100) + __GNUC_MINOR__) >= 402
  387 #  define DIAG_PRAGMA(x) DIAG_DO_PRAGMA(GCC diagnostic x)
  388 #  if ((__GNUC__ * 100) + __GNUC_MINOR__) >= 406
  389 #    define DIAG_OFF(x) DIAG_PRAGMA(push) DIAG_PRAGMA(ignored DIAG_JOINSTR(-W,x))
  390 #    define DIAG_ON(x) DIAG_PRAGMA(pop)
  391 #  else
  392 #    define DIAG_OFF(x) DIAG_PRAGMA(ignored DIAG_JOINSTR(-W,x))
  393 #    define DIAG_ON(x)  DIAG_PRAGMA(warning DIAG_JOINSTR(-W,x))
  394 #  endif
  395 #else
  396 #  define DIAG_OFF(x)
  397 #  define DIAG_ON(x)
  398 #endif
  399 
  400 /* Use for clang specific warnings */
  401 #ifdef __clang__
  402 #  define DIAG_OFF_CLANG(x) DIAG_OFF(x)
  403 #  define DIAG_ON_CLANG(x)  DIAG_ON(x)
  404 #else
  405 #  define DIAG_OFF_CLANG(x)
  406 #  define DIAG_ON_CLANG(x)
  407 #endif
  408 
  409 /*
  410  *  For dealing with APIs which are only deprecated in OSX (like the OpenSSL API)
  411  */
  412 #ifdef __APPLE__
  413 #  define USES_APPLE_DEPRECATED_API DIAG_OFF(deprecated-declarations)
  414 #  define USES_APPLE_RST DIAG_ON(deprecated-declarations)
  415 #else
  416 #  define USES_APPLE_DEPRECATED_API
  417 #  define USES_APPLE_RST
  418 #endif
  419 
  420 /*
  421  * end of Apple deprecation workaround macros
  422  */
  423 
  424 /*
  425  * Statement attributes, for various compilers.
  426  *
  427  * This was introduced sufficiently recently that compilers implementing
  428  * it also implement __has_attribute() (for example, GCC 5.0 and later
  429  * have __has_attribute(), and the "fallthrough" attribute was introduced
  430  * in GCC 7).
  431  *
  432  * Unfortunately, Clang does this wrong - a statement
  433  *
  434  *    __attribute__ ((fallthrough));
  435  *
  436  * produces bogus -Wmissing-declaration "declaration does not declare
  437  * anything" warnings (dear Clang: that's not a declaration, it's an
  438  * empty statement).  GCC, however, has no trouble with this.
  439  */
  440 #if __has_attribute(fallthrough) && !defined(__clang__)
  441 #  define ND_FALL_THROUGH __attribute__ ((fallthrough))
  442 #else
  443 #  define ND_FALL_THROUGH
  444 #endif /*  __has_attribute(fallthrough) */
  445 
  446 #endif /* netdissect_stdinc_h */