1 files changed, 288 insertions, 0 deletions
diff --git a/lib/libc/inet/inet_net_ntop.c b/lib/libc/inet/inet_net_ntop.c
new file mode 100644
index 0000000..867f441
--- /dev/null
+++ b/lib/libc/inet/inet_net_ntop.c
@@ -0,0 +1,288 @@
+/*
+ * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (c) 1996,1999 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 ISC DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC 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.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static const char rcsid[] = "$Id: inet_net_ntop.c,v 1.3.18.2 2006/06/20 02:51:32 marka Exp $";
+#endif
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include "port_before.h"
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include "port_after.h"
+
+#ifdef SPRINTF_CHAR
+# define SPRINTF(x) strlen(sprintf/**/x)
+#else
+# define SPRINTF(x) ((size_t)sprintf x)
+#endif
+
+static char *	inet_net_ntop_ipv4(const u_char *src, int bits, char *dst,
+		    size_t size);
+static char *	inet_net_ntop_ipv6(const u_char *src, int bits, char *dst,
+		    size_t size);
+
+/*%
+ * char *
+ * inet_net_ntop(af, src, bits, dst, size)
+ *	convert network number from network to presentation format.
+ *	generates CIDR style result always.
+ * return:
+ *	pointer to dst, or NULL if an error occurred (check errno).
+ * author:
+ *	Paul Vixie (ISC), July 1996
+ */
+char *
+inet_net_ntop(af, src, bits, dst, size)
+	int af;
+	const void *src;
+	int bits;
+	char *dst;
+	size_t size;
+{
+	switch (af) {
+	case AF_INET:
+		return (inet_net_ntop_ipv4(src, bits, dst, size));
+	case AF_INET6:
+		return (inet_net_ntop_ipv6(src, bits, dst, size));
+	default:
+		errno = EAFNOSUPPORT;
+		return (NULL);
+	}
+}
+
+/*%
+ * static char *
+ * inet_net_ntop_ipv4(src, bits, dst, size)
+ *	convert IPv4 network number from network to presentation format.
+ *	generates CIDR style result always.
+ * return:
+ *	pointer to dst, or NULL if an error occurred (check errno).
+ * note:
+ *	network byte order assumed.  this means 192.5.5.240/28 has
+ *	0b11110000 in its fourth octet.
+ * author:
+ *	Paul Vixie (ISC), July 1996
+ */
+static char *
+inet_net_ntop_ipv4(src, bits, dst, size)
+	const u_char *src;
+	int bits;
+	char *dst;
+	size_t size;
+{
+	char *odst = dst;
+	char *t;
+	u_int m;
+	int b;
+
+	if (bits < 0 || bits > 32) {
+		errno = EINVAL;
+		return (NULL);
+	}
+
+	if (bits == 0) {
+		if (size < sizeof "0")
+			goto emsgsize;
+		*dst++ = '0';
+		size--;
+		*dst = '\0';
+	}
+
+	/* Format whole octets. */
+	for (b = bits / 8; b > 0; b--) {
+		if (size <= sizeof "255.")
+			goto emsgsize;
+		t = dst;
+		dst += SPRINTF((dst, "%u", *src++));
+		if (b > 1) {
+			*dst++ = '.';
+			*dst = '\0';
+		}
+		size -= (size_t)(dst - t);
+	}
+
+	/* Format partial octet. */
+	b = bits % 8;
+	if (b > 0) {
+		if (size <= sizeof ".255")
+			goto emsgsize;
+		t = dst;
+		if (dst != odst)
+			*dst++ = '.';
+		m = ((1 << b) - 1) << (8 - b);
+		dst += SPRINTF((dst, "%u", *src & m));
+		size -= (size_t)(dst - t);
+	}
+
+	/* Format CIDR /width. */
+	if (size <= sizeof "/32")
+		goto emsgsize;
+	dst += SPRINTF((dst, "/%u", bits));
+	return (odst);
+
+ emsgsize:
+	errno = EMSGSIZE;
+	return (NULL);
+}
+
+/*%
+ * static char *
+ * inet_net_ntop_ipv6(src, bits, fakebits, dst, size)
+ *	convert IPv6 network number from network to presentation format.
+ *	generates CIDR style result always. Picks the shortest representation
+ *	unless the IP is really IPv4.
+ *	always prints specified number of bits (bits).
+ * return:
+ *	pointer to dst, or NULL if an error occurred (check errno).
+ * note:
+ *	network byte order assumed.  this means 192.5.5.240/28 has
+ *	0b11110000 in its fourth octet.
+ * author:
+ *	Vadim Kogan (UCB), June 2001
+ *  Original version (IPv4) by Paul Vixie (ISC), July 1996
+ */
+
+static char *
+inet_net_ntop_ipv6(const u_char *src, int bits, char *dst, size_t size) {
+	u_int	m;
+	int	b;
+	int	p;
+	int	zero_s, zero_l, tmp_zero_s, tmp_zero_l;
+	int	i;
+	int	is_ipv4 = 0;
+	unsigned char inbuf[16];
+	char outbuf[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255/128")];
+	char	*cp;
+	int	words;
+	u_char	*s;
+
+	if (bits < 0 || bits > 128) {
+		errno = EINVAL;
+		return (NULL);
+	}
+
+	cp = outbuf;
+
+	if (bits == 0) {
+		*cp++ = ':';
+		*cp++ = ':';
+		*cp = '\0';
+	} else {
+		/* Copy src to private buffer.  Zero host part. */
+		p = (bits + 7) / 8;
+		memcpy(inbuf, src, p);
+		memset(inbuf + p, 0, 16 - p);
+		b = bits % 8;
+		if (b != 0) {
+			m = ~0 << (8 - b);
+			inbuf[p-1] &= m;
+		}
+
+		s = inbuf;
+
+		/* how many words need to be displayed in output */
+		words = (bits + 15) / 16;
+		if (words == 1)
+			words = 2;
+
+		/* Find the longest substring of zero's */
+		zero_s = zero_l = tmp_zero_s = tmp_zero_l = 0;
+		for (i = 0; i < (words * 2); i += 2) {
+			if ((s[i] | s[i+1]) == 0) {
+				if (tmp_zero_l == 0)
+					tmp_zero_s = i / 2;
+				tmp_zero_l++;
+			} else {
+				if (tmp_zero_l && zero_l < tmp_zero_l) {
+					zero_s = tmp_zero_s;
+					zero_l = tmp_zero_l;
+					tmp_zero_l = 0;
+				}
+			}
+		}
+
+		if (tmp_zero_l && zero_l < tmp_zero_l) {
+			zero_s = tmp_zero_s;
+			zero_l = tmp_zero_l;
+		}
+
+		if (zero_l != words && zero_s == 0 && ((zero_l == 6) ||
+		    ((zero_l == 5 && s[10] == 0xff && s[11] == 0xff) ||
+		    ((zero_l == 7 && s[14] != 0 && s[15] != 1)))))
+			is_ipv4 = 1;
+
+		/* Format whole words. */
+		for (p = 0; p < words; p++) {
+			if (zero_l != 0 && p >= zero_s && p < zero_s + zero_l) {
+				/* Time to skip some zeros */
+				if (p == zero_s)
+					*cp++ = ':';
+				if (p == words - 1)
+					*cp++ = ':';
+				s++;
+				s++;
+				continue;
+			}
+
+			if (is_ipv4 && p > 5 ) {
+				*cp++ = (p == 6) ? ':' : '.';
+				cp += SPRINTF((cp, "%u", *s++));
+				/* we can potentially drop the last octet */
+				if (p != 7 || bits > 120) {
+					*cp++ = '.';
+					cp += SPRINTF((cp, "%u", *s++));
+				}
+			} else {
+				if (cp != outbuf)
+					*cp++ = ':';
+				cp += SPRINTF((cp, "%x", *s * 256 + s[1]));
+				s += 2;
+			}
+		}
+	}
+	/* Format CIDR /width. */
+	sprintf(cp, "/%u", bits);
+	if (strlen(outbuf) + 1 > size)
+		goto emsgsize;
+	strcpy(dst, outbuf);
+
+	return (dst);
+
+emsgsize:
+	errno = EMSGSIZE;
+	return (NULL);
+}
+
+/*
+ * Weak aliases for applications that use certain private entry points,
+ * and fail to include <arpa/inet.h>.
+ */
+#undef inet_net_ntop
+__weak_reference(__inet_net_ntop, inet_net_ntop);
+
+/*! \file */