util-internal.h (17702B)
1 /* 2 * Copyright (c) 2007-2012 Niels Provos and Nick Mathewson 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 3. The name of the author may not be used to endorse or promote products 13 * derived from this software without specific prior written permission. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 #ifndef UTIL_INTERNAL_H_INCLUDED_ 27 #define UTIL_INTERNAL_H_INCLUDED_ 28 29 #include "event2/event-config.h" 30 #include "evconfig-private.h" 31 32 #include <errno.h> 33 34 /* For EVUTIL_ASSERT */ 35 #include "log-internal.h" 36 #include <stdio.h> 37 #include <stdlib.h> 38 #ifdef EVENT__HAVE_SYS_SOCKET_H 39 #include <sys/socket.h> 40 #endif 41 #ifdef EVENT__HAVE_SYS_EVENTFD_H 42 #include <sys/eventfd.h> 43 #endif 44 #include "event2/util.h" 45 46 #include "time-internal.h" 47 #include "ipv6-internal.h" 48 49 #ifdef __cplusplus 50 extern "C" { 51 #endif 52 53 /* __has_attribute() wrapper */ 54 #ifdef __has_attribute 55 # define EVUTIL_HAS_ATTRIBUTE __has_attribute 56 #endif 57 /** clang 3 __has_attribute misbehaves in some versions */ 58 #if defined(__clang__) && __clang__ == 1 59 # if defined(__apple_build_version__) 60 # if __clang_major__ <= 6 61 # undef EVUTIL_HAS_ATTRIBUTE 62 # endif 63 # else /* !__apple_build_version__ */ 64 # if __clang_major__ == 3 && __clang_minor__ >= 2 && __clang_minor__ <= 5 65 # undef EVUTIL_HAS_ATTRIBUTE 66 # endif 67 # endif /* __apple_build_version__ */ 68 #endif /*\ defined(__clang__) && __clang__ == 1 */ 69 #ifndef EVUTIL_HAS_ATTRIBUTE 70 # define EVUTIL_HAS_ATTRIBUTE(x) 0 71 #endif 72 73 /* If we need magic to say "inline", get it for free internally. */ 74 #ifdef EVENT__inline 75 #define inline EVENT__inline 76 #endif 77 78 /* Define to appropriate substitute if compiler doesnt have __func__ */ 79 #if defined(EVENT__HAVE___func__) 80 # ifndef __func__ 81 # define __func__ __func__ 82 # endif 83 #elif defined(EVENT__HAVE___FUNCTION__) 84 # define __func__ __FUNCTION__ 85 #else 86 # define __func__ __FILE__ 87 #endif 88 89 /* A good no-op to use in macro definitions. */ 90 #define EVUTIL_NIL_STMT_ ((void)0) 91 /* A no-op that tricks the compiler into thinking a condition is used while 92 * definitely not making any code for it. Used to compile out asserts while 93 * avoiding "unused variable" warnings. The "!" forces the compiler to 94 * do the sizeof() on an int, in case "condition" is a bitfield value. 95 */ 96 #define EVUTIL_NIL_CONDITION_(condition) do { \ 97 (void)sizeof(!(condition)); \ 98 } while(0) 99 100 /* Internal use only: macros to match patterns of error codes in a 101 cross-platform way. We need these macros because of two historical 102 reasons: first, nonblocking IO functions are generally written to give an 103 error on the "blocked now, try later" case, so sometimes an error from a 104 read, write, connect, or accept means "no error; just wait for more 105 data," and we need to look at the error code. Second, Windows defines 106 a different set of error codes for sockets. */ 107 108 #ifndef _WIN32 109 110 #if EAGAIN == EWOULDBLOCK 111 #define EVUTIL_ERR_IS_EAGAIN(e) \ 112 ((e) == EAGAIN) 113 #else 114 #define EVUTIL_ERR_IS_EAGAIN(e) \ 115 ((e) == EAGAIN || (e) == EWOULDBLOCK) 116 #endif 117 118 /* True iff e is an error that means a read/write operation can be retried. */ 119 #define EVUTIL_ERR_RW_RETRIABLE(e) \ 120 ((e) == EINTR || EVUTIL_ERR_IS_EAGAIN(e)) 121 /* True iff e is an error that means an connect can be retried. */ 122 #define EVUTIL_ERR_CONNECT_RETRIABLE(e) \ 123 ((e) == EINTR || (e) == EINPROGRESS) 124 /* True iff e is an error that means a accept can be retried. */ 125 #define EVUTIL_ERR_ACCEPT_RETRIABLE(e) \ 126 ((e) == EINTR || EVUTIL_ERR_IS_EAGAIN(e) || (e) == ECONNABORTED) 127 128 /* True iff e is an error that means the connection was refused */ 129 #define EVUTIL_ERR_CONNECT_REFUSED(e) \ 130 ((e) == ECONNREFUSED) 131 132 #else 133 /* Win32 */ 134 135 #define EVUTIL_ERR_IS_EAGAIN(e) \ 136 ((e) == WSAEWOULDBLOCK || (e) == EAGAIN) 137 138 #define EVUTIL_ERR_RW_RETRIABLE(e) \ 139 ((e) == WSAEWOULDBLOCK || \ 140 (e) == WSAEINTR) 141 142 #define EVUTIL_ERR_CONNECT_RETRIABLE(e) \ 143 ((e) == WSAEWOULDBLOCK || \ 144 (e) == WSAEINTR || \ 145 (e) == WSAEINPROGRESS || \ 146 (e) == WSAEINVAL) 147 148 #define EVUTIL_ERR_ACCEPT_RETRIABLE(e) \ 149 EVUTIL_ERR_RW_RETRIABLE(e) 150 151 #define EVUTIL_ERR_CONNECT_REFUSED(e) \ 152 ((e) == WSAECONNREFUSED) 153 154 #endif 155 156 /* Arguments for shutdown() */ 157 #ifdef SHUT_RD 158 #define EVUTIL_SHUT_RD SHUT_RD 159 #else 160 #define EVUTIL_SHUT_RD 0 161 #endif 162 #ifdef SHUT_WR 163 #define EVUTIL_SHUT_WR SHUT_WR 164 #else 165 #define EVUTIL_SHUT_WR 1 /* SD_SEND */ 166 #endif 167 #ifdef SHUT_BOTH 168 #define EVUTIL_SHUT_BOTH SHUT_BOTH 169 #else 170 #define EVUTIL_SHUT_BOTH 2 171 #endif 172 173 /* Helper: Verify that all the elements in 'dlist' are internally consistent. 174 * Checks for circular lists and bad prev/next pointers. 175 * 176 * Example usage: 177 * EVUTIL_ASSERT_LIST_OK(eventlist, event, ev_next); 178 */ 179 #define EVUTIL_ASSERT_LIST_OK(dlist, type, field) do { \ 180 struct type *elm1, *elm2, **nextp; \ 181 if (LIST_EMPTY((dlist))) \ 182 break; \ 183 \ 184 /* Check list for circularity using Floyd's */ \ 185 /* 'Tortoise and Hare' algorithm */ \ 186 elm1 = LIST_FIRST((dlist)); \ 187 elm2 = LIST_NEXT(elm1, field); \ 188 while (elm1 && elm2) { \ 189 EVUTIL_ASSERT(elm1 != elm2); \ 190 elm1 = LIST_NEXT(elm1, field); \ 191 elm2 = LIST_NEXT(elm2, field); \ 192 if (!elm2) \ 193 break; \ 194 EVUTIL_ASSERT(elm1 != elm2); \ 195 elm2 = LIST_NEXT(elm2, field); \ 196 } \ 197 \ 198 /* Now check next and prev pointers for consistency. */ \ 199 nextp = &LIST_FIRST((dlist)); \ 200 elm1 = LIST_FIRST((dlist)); \ 201 while (elm1) { \ 202 EVUTIL_ASSERT(*nextp == elm1); \ 203 EVUTIL_ASSERT(nextp == elm1->field.le_prev); \ 204 nextp = &LIST_NEXT(elm1, field); \ 205 elm1 = *nextp; \ 206 } \ 207 } while (0) 208 209 /* Helper: Verify that all the elements in a TAILQ are internally consistent. 210 * Checks for circular lists and bad prev/next pointers. 211 * 212 * Example usage: 213 * EVUTIL_ASSERT_TAILQ_OK(activelist, event, ev_active_next); 214 */ 215 #define EVUTIL_ASSERT_TAILQ_OK(tailq, type, field) do { \ 216 struct type *elm1, *elm2, **nextp; \ 217 if (TAILQ_EMPTY((tailq))) \ 218 break; \ 219 \ 220 /* Check list for circularity using Floyd's */ \ 221 /* 'Tortoise and Hare' algorithm */ \ 222 elm1 = TAILQ_FIRST((tailq)); \ 223 elm2 = TAILQ_NEXT(elm1, field); \ 224 while (elm1 && elm2) { \ 225 EVUTIL_ASSERT(elm1 != elm2); \ 226 elm1 = TAILQ_NEXT(elm1, field); \ 227 elm2 = TAILQ_NEXT(elm2, field); \ 228 if (!elm2) \ 229 break; \ 230 EVUTIL_ASSERT(elm1 != elm2); \ 231 elm2 = TAILQ_NEXT(elm2, field); \ 232 } \ 233 \ 234 /* Now check next and prev pointers for consistency. */ \ 235 nextp = &TAILQ_FIRST((tailq)); \ 236 elm1 = TAILQ_FIRST((tailq)); \ 237 while (elm1) { \ 238 EVUTIL_ASSERT(*nextp == elm1); \ 239 EVUTIL_ASSERT(nextp == elm1->field.tqe_prev); \ 240 nextp = &TAILQ_NEXT(elm1, field); \ 241 elm1 = *nextp; \ 242 } \ 243 EVUTIL_ASSERT(nextp == (tailq)->tqh_last); \ 244 } while (0) 245 246 /* Locale-independent replacements for some ctypes functions. Use these 247 * when you care about ASCII's notion of character types, because you are about 248 * to send those types onto the wire. 249 */ 250 EVENT2_EXPORT_SYMBOL 251 int EVUTIL_ISALPHA_(char c); 252 EVENT2_EXPORT_SYMBOL 253 int EVUTIL_ISALNUM_(char c); 254 int EVUTIL_ISSPACE_(char c); 255 EVENT2_EXPORT_SYMBOL 256 int EVUTIL_ISDIGIT_(char c); 257 EVENT2_EXPORT_SYMBOL 258 int EVUTIL_ISXDIGIT_(char c); 259 int EVUTIL_ISPRINT_(char c); 260 int EVUTIL_ISLOWER_(char c); 261 int EVUTIL_ISUPPER_(char c); 262 EVENT2_EXPORT_SYMBOL 263 char EVUTIL_TOUPPER_(char c); 264 EVENT2_EXPORT_SYMBOL 265 char EVUTIL_TOLOWER_(char c); 266 267 /** Remove all trailing horizontal whitespace (space or tab) from the end of a 268 * string */ 269 EVENT2_EXPORT_SYMBOL 270 void evutil_rtrim_lws_(char *); 271 272 273 /** Helper macro. If we know that a given pointer points to a field in a 274 structure, return a pointer to the structure itself. Used to implement 275 our half-baked C OO. Example: 276 277 struct subtype { 278 int x; 279 struct supertype common; 280 int y; 281 }; 282 ... 283 void fn(struct supertype *super) { 284 struct subtype *sub = EVUTIL_UPCAST(super, struct subtype, common); 285 ... 286 } 287 */ 288 #define EVUTIL_UPCAST(ptr, type, field) \ 289 ((type *)(((char*)(ptr)) - evutil_offsetof(type, field))) 290 291 /* As open(pathname, flags, mode), except that the file is always opened with 292 * the close-on-exec flag set. (And the mode argument is mandatory.) 293 */ 294 int evutil_open_closeonexec_(const char *pathname, int flags, unsigned mode); 295 296 EVENT2_EXPORT_SYMBOL 297 int evutil_read_file_(const char *filename, char **content_out, size_t *len_out, 298 int is_binary); 299 300 EVENT2_EXPORT_SYMBOL 301 int evutil_socket_connect_(evutil_socket_t *fd_ptr, const struct sockaddr *sa, int socklen); 302 303 int evutil_socket_finished_connecting_(evutil_socket_t fd); 304 305 EVENT2_EXPORT_SYMBOL 306 int evutil_ersatz_socketpair_(int, int , int, evutil_socket_t[]); 307 308 int evutil_resolve_(int family, const char *hostname, struct sockaddr *sa, 309 ev_socklen_t *socklen, int port); 310 311 const char *evutil_getenv_(const char *name); 312 313 /* Structure to hold the state of our weak random number generator. 314 */ 315 struct evutil_weakrand_state { 316 ev_uint32_t seed; 317 }; 318 319 #define EVUTIL_WEAKRAND_MAX EV_INT32_MAX 320 321 /* Initialize the state of a week random number generator based on 'seed'. If 322 * the seed is 0, construct a new seed based on not-very-strong platform 323 * entropy, like the PID and the time of day. 324 * 325 * This function, and the other evutil_weakrand* functions, are meant for 326 * speed, not security or statistical strength. If you need a RNG which an 327 * attacker can't predict, or which passes strong statistical tests, use the 328 * evutil_secure_rng* functions instead. 329 */ 330 EVENT2_EXPORT_SYMBOL 331 ev_uint32_t evutil_weakrand_seed_(struct evutil_weakrand_state *state, ev_uint32_t seed); 332 /* Return a pseudorandom value between 0 and EVUTIL_WEAKRAND_MAX inclusive. 333 * Updates the state in 'seed' as needed -- this value must be protected by a 334 * lock. 335 */ 336 EVENT2_EXPORT_SYMBOL 337 ev_int32_t evutil_weakrand_(struct evutil_weakrand_state *seed); 338 /* Return a pseudorandom value x such that 0 <= x < top. top must be no more 339 * than EVUTIL_WEAKRAND_MAX. Updates the state in 'seed' as needed -- this 340 * value must be proteced by a lock */ 341 EVENT2_EXPORT_SYMBOL 342 ev_int32_t evutil_weakrand_range_(struct evutil_weakrand_state *seed, ev_int32_t top); 343 344 /* Evaluates to the same boolean value as 'p', and hints to the compiler that 345 * we expect this value to be false. */ 346 #if defined(__GNUC__) && __GNUC__ >= 3 /* gcc 3.0 or later */ 347 #define EVUTIL_UNLIKELY(p) __builtin_expect(!!(p),0) 348 #else 349 #define EVUTIL_UNLIKELY(p) (p) 350 #endif 351 352 #if EVUTIL_HAS_ATTRIBUTE(fallthrough) 353 #define EVUTIL_FALLTHROUGH __attribute__((fallthrough)) 354 #else 355 #define EVUTIL_FALLTHROUGH /* fallthrough */ 356 #endif 357 358 /* Replacement for assert() that calls event_errx on failure. */ 359 #ifdef NDEBUG 360 #define EVUTIL_ASSERT(cond) EVUTIL_NIL_CONDITION_(cond) 361 #define EVUTIL_FAILURE_CHECK(cond) 0 362 #else 363 #define EVUTIL_ASSERT(cond) \ 364 do { \ 365 if (EVUTIL_UNLIKELY(!(cond))) { \ 366 event_errx(EVENT_ERR_ABORT_, \ 367 "%s:%d: Assertion %s failed in %s", \ 368 __FILE__,__LINE__,#cond,__func__); \ 369 /* In case a user-supplied handler tries to */ \ 370 /* return control to us, log and abort here. */ \ 371 (void)fprintf(stderr, \ 372 "%s:%d: Assertion %s failed in %s", \ 373 __FILE__,__LINE__,#cond,__func__); \ 374 abort(); \ 375 } \ 376 } while (0) 377 #define EVUTIL_FAILURE_CHECK(cond) EVUTIL_UNLIKELY(cond) 378 #endif 379 380 #ifndef EVENT__HAVE_STRUCT_SOCKADDR_STORAGE 381 /* Replacement for sockaddr storage that we can use internally on platforms 382 * that lack it. It is not space-efficient, but neither is sockaddr_storage. 383 */ 384 struct sockaddr_storage { 385 union { 386 struct sockaddr ss_sa; 387 struct sockaddr_in ss_sin; 388 struct sockaddr_in6 ss_sin6; 389 char ss_padding[128]; 390 } ss_union; 391 }; 392 #define ss_family ss_union.ss_sa.sa_family 393 #endif 394 395 /* Internal addrinfo error code. This one is returned from only from 396 * evutil_getaddrinfo_common_, when we are sure that we'll have to hit a DNS 397 * server. */ 398 #define EVUTIL_EAI_NEED_RESOLVE -90002 399 400 struct evdns_base; 401 struct evdns_getaddrinfo_request; 402 typedef struct evdns_getaddrinfo_request* (*evdns_getaddrinfo_fn)( 403 struct evdns_base *base, 404 const char *nodename, const char *servname, 405 const struct evutil_addrinfo *hints_in, 406 void (*cb)(int, struct evutil_addrinfo *, void *), void *arg); 407 EVENT2_EXPORT_SYMBOL 408 void evutil_set_evdns_getaddrinfo_fn_(evdns_getaddrinfo_fn fn); 409 typedef void (*evdns_getaddrinfo_cancel_fn)( 410 struct evdns_getaddrinfo_request *req); 411 EVENT2_EXPORT_SYMBOL 412 void evutil_set_evdns_getaddrinfo_cancel_fn_(evdns_getaddrinfo_cancel_fn fn); 413 414 EVENT2_EXPORT_SYMBOL 415 struct evutil_addrinfo *evutil_new_addrinfo_(struct sockaddr *sa, 416 ev_socklen_t socklen, const struct evutil_addrinfo *hints); 417 EVENT2_EXPORT_SYMBOL 418 struct evutil_addrinfo *evutil_addrinfo_append_(struct evutil_addrinfo *first, 419 struct evutil_addrinfo *append); 420 EVENT2_EXPORT_SYMBOL 421 void evutil_adjust_hints_for_addrconfig_(struct evutil_addrinfo *hints); 422 EVENT2_EXPORT_SYMBOL 423 int evutil_getaddrinfo_common_(const char *nodename, const char *servname, 424 struct evutil_addrinfo *hints, struct evutil_addrinfo **res, int *portnum); 425 426 struct evdns_getaddrinfo_request *evutil_getaddrinfo_async_( 427 struct evdns_base *dns_base, 428 const char *nodename, const char *servname, 429 const struct evutil_addrinfo *hints_in, 430 void (*cb)(int, struct evutil_addrinfo *, void *), void *arg); 431 void evutil_getaddrinfo_cancel_async_(struct evdns_getaddrinfo_request *data); 432 433 /** Return true iff sa is a looback address. (That is, it is 127.0.0.1/8, or 434 * ::1). */ 435 EVENT2_EXPORT_SYMBOL 436 int evutil_sockaddr_is_loopback_(const struct sockaddr *sa); 437 438 439 /** 440 Formats a sockaddr sa into a string buffer of size outlen stored in out. 441 Returns a pointer to out. Always writes something into out, so it's safe 442 to use the output of this function without checking it for NULL. 443 */ 444 EVENT2_EXPORT_SYMBOL 445 const char *evutil_format_sockaddr_port_(const struct sockaddr *sa, char *out, size_t outlen); 446 447 int evutil_hex_char_to_int_(char c); 448 449 450 void evutil_free_secure_rng_globals_(void); 451 void evutil_free_globals_(void); 452 453 #ifdef _WIN32 454 EVENT2_EXPORT_SYMBOL 455 HMODULE evutil_load_windows_system_library_(const TCHAR *library_name); 456 #endif 457 458 #ifndef EV_SIZE_FMT 459 #if defined(_MSC_VER) || defined(__MINGW32__) || defined(__MINGW64__) 460 #define EV_U64_FMT "%I64u" 461 #define EV_I64_FMT "%I64d" 462 #define EV_I64_ARG(x) ((__int64)(x)) 463 #define EV_U64_ARG(x) ((unsigned __int64)(x)) 464 #else 465 #define EV_U64_FMT "%llu" 466 #define EV_I64_FMT "%lld" 467 #define EV_I64_ARG(x) ((long long)(x)) 468 #define EV_U64_ARG(x) ((unsigned long long)(x)) 469 #endif 470 #endif 471 472 #ifdef _WIN32 473 #define EV_SOCK_FMT EV_I64_FMT 474 #define EV_SOCK_ARG(x) EV_I64_ARG((x)) 475 #else 476 #define EV_SOCK_FMT "%d" 477 #define EV_SOCK_ARG(x) (x) 478 #endif 479 480 #if defined(__STDC__) && defined(__STDC_VERSION__) && !defined(__MINGW64_VERSION_MAJOR) 481 #if (__STDC_VERSION__ >= 199901L) 482 #define EV_SIZE_FMT "%zu" 483 #define EV_SSIZE_FMT "%zd" 484 #define EV_SIZE_ARG(x) (x) 485 #define EV_SSIZE_ARG(x) (x) 486 #endif 487 #endif 488 489 #ifndef EV_SIZE_FMT 490 #if (EVENT__SIZEOF_SIZE_T <= EVENT__SIZEOF_LONG) 491 #define EV_SIZE_FMT "%lu" 492 #define EV_SSIZE_FMT "%ld" 493 #define EV_SIZE_ARG(x) ((unsigned long)(x)) 494 #define EV_SSIZE_ARG(x) ((long)(x)) 495 #else 496 #define EV_SIZE_FMT EV_U64_FMT 497 #define EV_SSIZE_FMT EV_I64_FMT 498 #define EV_SIZE_ARG(x) EV_U64_ARG(x) 499 #define EV_SSIZE_ARG(x) EV_I64_ARG(x) 500 #endif 501 #endif 502 503 EVENT2_EXPORT_SYMBOL 504 evutil_socket_t evutil_socket_(int domain, int type, int protocol); 505 evutil_socket_t evutil_accept4_(evutil_socket_t sockfd, struct sockaddr *addr, 506 ev_socklen_t *addrlen, int flags); 507 508 /* used by one of the test programs.. */ 509 EVENT2_EXPORT_SYMBOL 510 int evutil_make_internal_pipe_(evutil_socket_t fd[2]); 511 evutil_socket_t evutil_eventfd_(unsigned initval, int flags); 512 513 #ifdef SOCK_NONBLOCK 514 #define EVUTIL_SOCK_NONBLOCK SOCK_NONBLOCK 515 #else 516 #define EVUTIL_SOCK_NONBLOCK 0x4000000 517 #endif 518 #ifdef SOCK_CLOEXEC 519 #define EVUTIL_SOCK_CLOEXEC SOCK_CLOEXEC 520 #else 521 #define EVUTIL_SOCK_CLOEXEC 0x80000000 522 #endif 523 #ifdef EFD_NONBLOCK 524 #define EVUTIL_EFD_NONBLOCK EFD_NONBLOCK 525 #else 526 #define EVUTIL_EFD_NONBLOCK 0x4000 527 #endif 528 #ifdef EFD_CLOEXEC 529 #define EVUTIL_EFD_CLOEXEC EFD_CLOEXEC 530 #else 531 #define EVUTIL_EFD_CLOEXEC 0x8000 532 #endif 533 534 void evutil_memclear_(void *mem, size_t len); 535 536 struct in_addr; 537 struct in6_addr; 538 539 /* This is a any, loopback, link-local, multicast */ 540 EVENT2_EXPORT_SYMBOL 541 int evutil_v4addr_is_local_(const struct in_addr *in); 542 /* This is a reserved, ipv4compat, ipv4map, loopback, 543 * link-local, multicast, or unspecified address. */ 544 EVENT2_EXPORT_SYMBOL 545 int evutil_v6addr_is_local_(const struct in6_addr *in); 546 547 #ifdef __cplusplus 548 } 549 #endif 550 551 #endif