commit c02a0b8cc36dae9a1e7fb2953262bf631eac1ebe
parent e34db74d83770ca53f18601223e03cce692b8ae3
Author: Jordan Ritter <jpr5@darkridge.com>
Date: Wed, 27 Apr 2005 22:29:58 +0000
win32-compatible implementation of inet_ntop() (used from FreeBSD,
copyright notice and license preserved, as required)
Diffstat:
2 files changed, 194 insertions(+), 0 deletions(-)
diff --git a/win32/support/inet_ntop.c b/win32/support/inet_ntop.c
@@ -0,0 +1,186 @@
+/*
+ * $Id$
+ *
+ * This is Win32-specific support functionality for inet_ntop(),
+ * which is missing from Win32. The code was used from FreeBSD:
+ *
+ * $FreeBSD: /repoman/r/ncvs/src/lib/libc/net/inet_ntop.c,v 1.6.2.2 2002/12/16 15:19:35 robert Exp $"
+ */
+
+/* Copyright (c) 1996 by 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.
+ */
+
+#include <winsock2.h>
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "nettypes.h"
+
+/*
+ * WARNING: Don't even consider trying to compile this on a system where
+ * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
+ */
+
+static const char *inet_ntop4(const u_char *src, char *dst, size_t size);
+static const char *inet_ntop6(const u_char *src, char *dst, size_t size);
+
+/* char *
+ * inet_ntop(af, src, dst, size)
+ * convert a network format address to presentation format.
+ * return:
+ * pointer to presentation format address (`dst'), or NULL (see errno).
+ * author:
+ * Paul Vixie, 1996.
+ */
+const char *inet_ntop(int af, const void *src, char *dst, size_t size) {
+ switch (af) {
+ case AF_INET:
+ return (inet_ntop4(src, dst, size));
+ case AF_INET6:
+ return (inet_ntop6(src, dst, size));
+ }
+
+ errno = WSAEAFNOSUPPORT;
+ return (NULL);
+}
+
+/* const char *
+ * inet_ntop4(src, dst, size)
+ * format an IPv4 address, more or less like inet_ntoa()
+ * return:
+ * `dst' (as a const)
+ * notes:
+ * (1) uses no statics
+ * (2) takes a u_char* not an in_addr as input
+ * author:
+ * Paul Vixie, 1996.
+ */
+static const char *inet_ntop4(const u_char *src, char *dst, size_t size) {
+ static const char fmt[] = "%u.%u.%u.%u";
+
+ if ((size_t)_snprintf(dst, size, fmt, src[0], src[1], src[2], src[3])
+ >= size) {
+ errno = ENOSPC;
+ return (NULL);
+ }
+
+ return (dst);
+}
+
+/* const char *
+ * inet_ntop6(src, dst, size)
+ * convert IPv6 binary address into presentation (printable) format
+ * author:
+ * Paul Vixie, 1996.
+ */
+static const char *inet_ntop6(const u_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"], *tp;
+ struct { int base, len; } best, cur;
+ u_int words[NS_IN6ADDRSZ / NS_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 < NS_IN6ADDRSZ; i++)
+ words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3));
+
+ best.base = -1;
+ cur.base = -1;
+
+ for (i = 0; i < (NS_IN6ADDRSZ / NS_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)
+ if (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 < (NS_IN6ADDRSZ / NS_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)))
+ return (NULL);
+
+ tp += strlen(tp);
+
+ break;
+ }
+
+ tp += sprintf(tp, "%x", words[i]);
+ }
+
+ /* Was it a trailing run of 0x00's? */
+ if (best.base != -1 && (best.base + best.len) ==
+ (NS_IN6ADDRSZ / NS_INT16SZ))
+ *tp++ = ':';
+
+ *tp++ = '\0';
+
+ /*
+ * Check for overflow, copy, and we're done.
+ */
+
+ if ((size_t)(tp - tmp) > size) {
+ errno = ENOSPC;
+ return (NULL);
+ }
+
+ strcpy(dst, tmp);
+ return (dst);
+}
diff --git a/win32/support/inet_ntop.h b/win32/support/inet_ntop.h
@@ -0,0 +1,7 @@
+/*
+ * $Id$
+ *
+ * Compatibility header, supporting Win32-specific inet_ntop() implementation.
+ */
+
+int inet_ntop(int af, const void *src, char *dst, size_t size);+
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