diff options
Diffstat (limited to 'libcurl/src/lib/inet_ntop.c')
| -rw-r--r-- | libcurl/src/lib/inet_ntop.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/libcurl/src/lib/inet_ntop.c b/libcurl/src/lib/inet_ntop.c new file mode 100644 index 0000000..daf9c1c --- /dev/null +++ b/libcurl/src/lib/inet_ntop.c @@ -0,0 +1,198 @@ +/*
+ * 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 "curl_setup.h"
+
+#ifndef HAVE_INET_NTOP
+
+#ifdef HAVE_SYS_PARAM_H
+#include <sys/param.h>
+#endif
+#ifdef HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+#ifdef HAVE_ARPA_INET_H
+#include <arpa/inet.h>
+#endif
+
+#include "curl_printf.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 losing the
+ * actual last winsock error. So use macro ERRNO to fetch the
+ * errno this function sets when returning NULL, not SOCKERRNO.
+ */
+CURL_STATIC 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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