/* * Copyright (C) 1996-2001 Internet Software Consortium. * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL * INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ /* * Original code by Paul Vixie. "curlified" by Gisle Vanem. */ #include "setup.h" #ifndef HAVE_INET_NTOP #ifdef HAVE_SYS_PARAM_H #include #endif #ifdef HAVE_SYS_TYPES_H #include #endif #ifdef HAVE_SYS_SOCKET_H #include #endif #ifdef HAVE_NETINET_IN_H #include #endif #ifdef HAVE_ARPA_INET_H #include #endif #include #include #define _MPRINTF_REPLACE /* use our functions only */ #include #include "inet_ntop.h" #if defined(HAVE_INET_NTOA_R) && !defined(HAVE_INET_NTOA_R_DECL) /* this platform has a inet_ntoa_r() function, but no proto declared anywhere so we include our own proto to make compilers happy */ #include "inet_ntoa_r.h" #endif #define IN6ADDRSZ 16 #define INADDRSZ 4 #define INT16SZ 2 /* * Format an IPv4 address, more or less like inet_ntoa(). * * Returns `dst' (as a const) * Note: * - uses no statics * - takes a unsigned char* not an in_addr as input */ static char *inet_ntop4 (const unsigned char *src, char *dst, size_t size) { #if defined(HAVE_INET_NTOA_R_2_ARGS) const char *ptr; curlassert(size >= 16); ptr = inet_ntoa_r(*(struct in_addr*)src, dst); return (char *)memmove(dst, ptr, strlen(ptr)+1); #elif defined(HAVE_INET_NTOA_R) return inet_ntoa_r(*(struct in_addr*)src, dst, size); #else const char *addr = inet_ntoa(*(struct in_addr*)src); if (strlen(addr) >= size) { SET_ERRNO(ENOSPC); return (NULL); } return strcpy(dst, addr); #endif } #ifdef ENABLE_IPV6 /* * Convert IPv6 binary address into presentation (printable) format. */ static char *inet_ntop6 (const unsigned char *src, char *dst, size_t size) { /* * Note that int32_t and int16_t need only be "at least" large enough * to contain a value of the specified size. On some systems, like * Crays, there is no such thing as an integer variable with 16 bits. * Keep this in mind if you think this function should have been coded * to use pointer overlays. All the world's not a VAX. */ char tmp[sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")]; char *tp; struct { long base; long len; } best, cur; unsigned long words[IN6ADDRSZ / INT16SZ]; int i; /* Preprocess: * Copy the input (bytewise) array into a wordwise array. * Find the longest run of 0x00's in src[] for :: shorthanding. */ memset(words, '\0', sizeof(words)); for (i = 0; i < IN6ADDRSZ; i++) words[i/2] |= (src[i] << ((1 - (i % 2)) << 3)); best.base = -1; cur.base = -1; best.len = 0; cur.len = 0; for (i = 0; i < (IN6ADDRSZ / INT16SZ); i++) { if (words[i] == 0) { if (cur.base == -1) cur.base = i, cur.len = 1; else cur.len++; } else if (cur.base != -1) { if (best.base == -1 || cur.len > best.len) best = cur; cur.base = -1; } } if ((cur.base != -1) && (best.base == -1 || cur.len > best.len)) best = cur; if (best.base != -1 && best.len < 2) best.base = -1; /* Format the result. */ tp = tmp; for (i = 0; i < (IN6ADDRSZ / INT16SZ); i++) { /* Are we inside the best run of 0x00's? */ if (best.base != -1 && i >= best.base && i < (best.base + best.len)) { if (i == best.base) *tp++ = ':'; continue; } /* Are we following an initial run of 0x00s or any real hex? */ if (i != 0) *tp++ = ':'; /* Is this address an encapsulated IPv4? */ if (i == 6 && best.base == 0 && (best.len == 6 || (best.len == 5 && words[5] == 0xffff))) { if (!inet_ntop4(src+12, tp, sizeof(tmp) - (tp - tmp))) { SET_ERRNO(ENOSPC); return (NULL); } tp += strlen(tp); break; } tp += snprintf(tp, 5, "%lx", words[i]); } /* Was it a trailing run of 0x00's? */ if (best.base != -1 && (best.base + best.len) == (IN6ADDRSZ / INT16SZ)) *tp++ = ':'; *tp++ = '\0'; /* Check for overflow, copy, and we're done. */ if ((size_t)(tp - tmp) > size) { SET_ERRNO(ENOSPC); return (NULL); } return strcpy (dst, tmp); } #endif /* ENABLE_IPV6 */ /* * Convert a network format address to presentation format. * * Returns pointer to presentation format address (`buf'). * Returns NULL on error and errno set with the specific * error, EAFNOSUPPORT or ENOSPC. * * On Windows we store the error in the thread errno, not * in the winsock error code. This is to avoid loosing the * actual last winsock error. So use macro ERRNO to fetch the * errno this funtion sets when returning NULL, not SOCKERRNO. */ char *Curl_inet_ntop(int af, const void *src, char *buf, size_t size) { switch (af) { case AF_INET: return inet_ntop4((const unsigned char*)src, buf, size); #ifdef ENABLE_IPV6 case AF_INET6: return inet_ntop6((const unsigned char*)src, buf, size); #endif default: SET_ERRNO(EAFNOSUPPORT); return NULL; } } #endif /* HAVE_INET_NTOP */