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- /*
- * 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 <sys/param.h>
- #endif
- #ifdef HAVE_SYS_SOCKET_H
- #include <sys/socket.h>
- #endif
- #ifdef HAVE_NETINET_IN_H
- #include <netinet/in.h>
- #endif
- #ifdef HAVE_ARPA_INET_H
- #include <arpa/inet.h>
- #endif
- #include <string.h>
- #include <errno.h>
- #define _MPRINTF_REPLACE /* use our functions only */
- #include <curl/mprintf.h>
- #include "inet_ntop.h"
- #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)
- {
- char tmp[sizeof "255.255.255.255"];
- size_t len;
- DEBUGASSERT(size >= 16);
- tmp[0] = '\0';
- (void)snprintf(tmp, sizeof(tmp), "%d.%d.%d.%d",
- ((int)((unsigned char)src[0])) & 0xff,
- ((int)((unsigned char)src[1])) & 0xff,
- ((int)((unsigned char)src[2])) & 0xff,
- ((int)((unsigned char)src[3])) & 0xff);
- len = strlen(tmp);
- if(len == 0 || len >= size)
- {
- SET_ERRNO(ENOSPC);
- return (NULL);
- }
- strcpy(dst, tmp);
- return dst;
- }
- #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);
- }
- strcpy(dst, tmp);
- return dst;
- }
- #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 */
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