1 files changed, 203 insertions, 0 deletions

diff --git a/src/lib/libc/net/inet_ntop.c b/src/lib/libc/net/inet_ntop.c
new file mode 100644
index 0000000000..ec5c12983a
--- /dev/null
+++ b/src/lib/libc/net/inet_ntop.c
@@ -0,0 +1,203 @@
+/*      $OpenBSD: inet_ntop.c,v 1.6 2005/03/25 13:24:12 otto 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.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+#if 0
+static char rcsid[] = "$From: inet_ntop.c,v 8.7 1996/08/05 08:41:18 vixie Exp $";
+#else
+static char rcsid[] = "$OpenBSD: inet_ntop.c,v 1.6 2005/03/25 13:24:12 otto Exp $";
+#endif
+#endif /* LIBC_SCCS and not lint */
+
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <arpa/nameser.h>
+#include <string.h>
+#include <errno.h>
+#include <stdio.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));
+        default:
+                errno = EAFNOSUPPORT;
+                return (NULL);
+        }
+        /* NOTREACHED */
+}
+
+/* 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";
+        char tmp[sizeof "255.255.255.255"];
+        int l;
+
+        l = snprintf(tmp, size, fmt, src[0], src[1], src[2], src[3]);
+        if (l <= 0 || l >= size) {
+                errno = ENOSPC;
+                return (NULL);
+        }
+        strlcpy(dst, tmp, size);
+        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"];
+        char *tp, *ep;
+        struct { int base, len; } best, cur;
+        u_int words[IN6ADDRSZ / INT16SZ];
+        int i;
+        int advance;
+
+        /*
+         * 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;
+        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) {
+                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;
+        ep = tmp + sizeof(tmp);
+        for (i = 0; i < (IN6ADDRSZ / INT16SZ) && tp < ep; 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) {
+                                if (tp + 1 >= ep)
+                                        return (NULL);
+                                *tp++ = ':';
+                        }
+                        continue;
+                }
+                /* Are we following an initial run of 0x00s or any real hex? */
+                if (i != 0) {
+                        if (tp + 1 >= ep)
+                                return (NULL);
+                        *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, (size_t)(ep - tp)))
+                                return (NULL);
+                        tp += strlen(tp);
+                        break;
+                }
+                advance = snprintf(tp, ep - tp, "%x", words[i]);
+                if (advance <= 0 || advance >= ep - tp)
+                        return (NULL);
+                tp += advance;
+        }
+        /* Was it a trailing run of 0x00's? */
+        if (best.base != -1 && (best.base + best.len) == (IN6ADDRSZ / INT16SZ)) {
+                if (tp + 1 >= ep)
+                        return (NULL);
+                *tp++ = ':';
+        }
+        if (tp + 1 >= ep)
+                return (NULL);
+        *tp++ = '\0';
+
+        /*
+         * Check for overflow, copy, and we're done.
+         */
+        if ((size_t)(tp - tmp) > size) {
+                errno = ENOSPC;
+                return (NULL);
+        }
+        strlcpy(dst, tmp, size);
+        return (dst);
+}