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 __ntohl(unsigned long x)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 __ntohs(unsigned short x)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 */ 383