The Tcpdump Group git mirrors - tcpdump/blob - netdissect-stdinc.h

   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  * Statement attributes, for various compilers.
 362  *
 363  * This was introduced sufficiently recently that compilers implementing
 364  * it also implement __has_attribute() (for example, GCC 5.0 and later
 365  * have __has_attribute(), and the "fallthrough" attribute was introduced
 366  * in GCC 7).
 367  *
 368  * Unfortunately, Clang does this wrong - a statement
 369  *
 370  *    __attribute__ ((fallthrough));
 371  *
 372  * produces bogus -Wmissing-declaration "declaration does not declare
 373  * anything" warnings (dear Clang: that's not a declaration, it's an
 374  * empty statement).  GCC, however, has no trouble with this.
 375  */
 376 #if __has_attribute(fallthrough) && !defined(__clang__)
 377 #  define ND_FALL_THROUGH __attribute__ ((fallthrough))
 378 #else
 379 #  define ND_FALL_THROUGH
 380 #endif /*  __has_attribute(fallthrough) */
 381
 382 #endif /* netdissect_stdinc_h */