diff --git a/strtoaddr.c b/strtoaddr.c
new file mode 100644
index 0000000..81a041f
--- /dev/null
+++ b/strtoaddr.c
@@ -0,0 +1,239 @@
+/*
+ * 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <netdissect-stdinc.h>
+#include <stddef.h>
+#include <string.h>
+
+#include "strtoaddr.h"
+
+#ifndef NS_INADDRSZ
+#define NS_INADDRSZ	4	/* IPv4 T_A */
+#endif
+
+#ifndef NS_IN6ADDRSZ
+#define NS_IN6ADDRSZ	16	/* IPv6 T_AAAA */
+#endif
+
+#ifndef NS_INT16SZ
+#define NS_INT16SZ	2	/* #/bytes of data in a uint16_t */
+#endif
+
+/*%
+ * 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.
+ */
+
+#ifndef NS_IN6ADDRSZ
+#define NS_IN6ADDRSZ   16   /* IPv6 T_AAAA */
+#endif
+
+/* int
+ * strtoaddr(src, dst)
+ *	convert presentation level IPv4 address to network order binary form.
+ * return:
+ *	1 if `src' is a valid input, else 0.
+ * notice:
+ *	does not touch `dst' unless it's returning 1.
+ * author:
+ *	Paul Vixie, 1996.
+ */
+int
+strtoaddr(const char *src, void *dst)
+{
+	uint32_t val;
+	u_int digit;
+	ptrdiff_t n;
+	unsigned char c;
+	u_int parts[4];
+	u_int *pp = parts;
+
+	c = *src;
+	for (;;) {
+		/*
+		 * Collect number up to ``.''.
+		 * Values are specified as for C:
+		 * 0x=hex, 0=octal, isdigit=decimal.
+		 */
+		if (!isdigit(c))
+			return (0);
+		val = 0;
+		if (c == '0') {
+			c = *++src;
+			if (c == 'x' || c == 'X')
+				return (0);
+			else if (isdigit(c) && c != '9')
+				return (0);
+		}
+		for (;;) {
+			if (isdigit(c)) {
+				digit = c - '0';
+				if (digit >= 10)
+					break;
+				val = (val * 10) + digit;
+				c = *++src;
+			} else
+				break;
+		}
+		if (c == '.') {
+			/*
+			 * Internet format:
+			 *	a.b.c.d
+			 *	a.b.c	(with c treated as 16 bits)
+			 *	a.b	(with b treated as 24 bits)
+			 *	a	(with a treated as 32 bits)
+			 */
+			if (pp >= parts + 3)
+				return (0);
+			*pp++ = val;
+			c = *++src;
+		} else
+			break;
+	}
+	/*
+	 * Check for trailing characters.
+	 */
+	if (c != '\0' && !isspace(c))
+		return (0);
+	/*
+	 * Find the number of parts specified.
+	 * It must be 4; we only support dotted quads, we don't
+	 * support shorthand.
+	 */
+	n = pp - parts + 1;
+	if (n != 4)
+		return (0);
+	/*
+	 * parts[0-2] were set to the first 3 parts of the address;
+	 * val was set to the 4th part.
+	 *
+	 * Check if any part is bigger than 255.
+	 */
+	if ((parts[0] | parts[1] | parts[2] | val) > 0xff)
+		return (0);
+	/*
+	 * Add the other three parts to val.
+	 */
+	val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
+	if (dst) {
+		val = htonl(val);
+		memcpy(dst, &val, NS_INADDRSZ);
+	}
+	return (1);
+}
+
+/* int
+ * strtoaddr6(src, dst)
+ *	convert presentation level IPv6 address to network order binary form.
+ * return:
+ *	1 if `src' is a valid [RFC1884 2.2] address, else 0.
+ * notice:
+ *	(1) does not touch `dst' unless it's returning 1.
+ *	(2) :: in a full address is silently ignored.
+ * credit:
+ *	inspired by Mark Andrews.
+ * author:
+ *	Paul Vixie, 1996.
+ */
+int
+strtoaddr6(const char *src, void *dst)
+{
+	static const char xdigits_l[] = "0123456789abcdef",
+			  xdigits_u[] = "0123456789ABCDEF";
+	u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
+	const char *xdigits, *curtok;
+	int ch, seen_xdigits;
+	u_int val;
+
+	memset((tp = tmp), '\0', NS_IN6ADDRSZ);
+	endp = tp + NS_IN6ADDRSZ;
+	colonp = NULL;
+	/* Leading :: requires some special handling. */
+	if (*src == ':')
+		if (*++src != ':')
+			return (0);
+	curtok = src;
+	seen_xdigits = 0;
+	val = 0;
+	while ((ch = *src++) != '\0') {
+		const char *pch;
+
+		if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
+			pch = strchr((xdigits = xdigits_u), ch);
+		if (pch != NULL) {
+			val <<= 4;
+			val |= (int)(pch - xdigits);
+			if (++seen_xdigits > 4)
+				return (0);
+			continue;
+		}
+		if (ch == ':') {
+			curtok = src;
+			if (!seen_xdigits) {
+				if (colonp)
+					return (0);
+				colonp = tp;
+				continue;
+			} else if (*src == '\0')
+				return (0);
+			if (tp + NS_INT16SZ > endp)
+				return (0);
+			*tp++ = (u_char) (val >> 8) & 0xff;
+			*tp++ = (u_char) val & 0xff;
+			seen_xdigits = 0;
+			val = 0;
+			continue;
+		}
+		if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
+		    strtoaddr(curtok, tp) > 0) {
+			tp += NS_INADDRSZ;
+			seen_xdigits = 0;
+			break;	/*%< '\\0' was seen by strtoaddr(). */
+		}
+		return (0);
+	}
+	if (seen_xdigits) {
+		if (tp + NS_INT16SZ > endp)
+			return (0);
+		*tp++ = (u_char) (val >> 8) & 0xff;
+		*tp++ = (u_char) val & 0xff;
+	}
+	if (colonp != NULL) {
+		/*
+		 * Since some memmove()'s erroneously fail to handle
+		 * overlapping regions, we'll do the shift by hand.
+		 */
+		const ptrdiff_t n = tp - colonp;
+		int i;
+
+		if (tp == endp)
+			return (0);
+		for (i = 1; i <= n; i++) {
+			endp[- i] = colonp[n - i];
+			colonp[n - i] = 0;
+		}
+		tp = endp;
+	}
+	if (tp != endp)
+		return (0);
+	memcpy(dst, tmp, NS_IN6ADDRSZ);
+	return (1);
+}