1 files changed, 265 insertions, 0 deletions

diff --git a/gl/inet_pton.c b/gl/inet_pton.c
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--- /dev/null
+++ b/gl/inet_pton.c
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+/* inet_pton.c -- convert IPv4 and IPv6 addresses from text to binary form
+
+   Copyright (C) 2006, 2008-2026 Free Software Foundation, Inc.
+
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   This file is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/*
+ * 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 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 <config.h>
+
+/* Specification.  */
+#include <arpa/inet.h>
+
+#if HAVE_DECL_INET_PTON
+
+# undef inet_pton
+
+int
+rpl_inet_pton (int af, const char *restrict src, void *restrict dst)
+{
+  return inet_pton (af, src, dst);
+}
+
+#else
+
+# include <c-ctype.h>
+# include <string.h>
+# include <errno.h>
+
+# define NS_INADDRSZ 4
+# define NS_IN6ADDRSZ 16
+# define NS_INT16SZ 2
+
+/*
+ * 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 int inet_pton4 (const char *src, unsigned char *dst);
+# if HAVE_IPV6
+static int inet_pton6 (const char *src, unsigned char *dst);
+# endif
+
+/* int
+ * inet_pton(af, src, dst)
+ *      convert from presentation format (which usually means ASCII printable)
+ *      to network format (which is usually some kind of binary format).
+ * return:
+ *      1 if the address was valid for the specified address family
+ *      0 if the address wasn't valid ('dst' is untouched in this case)
+ *      -1 if some other error occurred ('dst' is untouched in this case, too)
+ * author:
+ *      Paul Vixie, 1996.
+ */
+int
+inet_pton (int af, const char *restrict src, void *restrict dst)
+{
+  switch (af)
+    {
+    case AF_INET:
+      return (inet_pton4 (src, dst));
+
+# if HAVE_IPV6
+    case AF_INET6:
+      return (inet_pton6 (src, dst));
+# endif
+
+    default:
+      errno = EAFNOSUPPORT;
+      return (-1);
+    }
+  /* NOTREACHED */
+}
+
+/* int
+ * inet_pton4(src, dst)
+ *      like inet_aton() but without all the hexadecimal, octal (with the
+ *      exception of 0) and shorthand.
+ * return:
+ *      1 if 'src' is a valid dotted quad, else 0.
+ * notice:
+ *      does not touch 'dst' unless it's returning 1.
+ * author:
+ *      Paul Vixie, 1996.
+ */
+static int
+inet_pton4 (const char *restrict src, unsigned char *restrict dst)
+{
+  unsigned char tmp[NS_INADDRSZ];
+
+  {
+    int saw_digit = 0;
+    int octets = 0;
+    unsigned char *tp = tmp;
+    *tp = 0;
+    int ch;
+    while ((ch = *src++) != '\0')
+      {
+        if (ch >= '0' && ch <= '9')
+          {
+            if (saw_digit && *tp == 0)
+              return (0);
+            unsigned new = *tp * 10 + (ch - '0');
+            if (new > 255)
+              return (0);
+            *tp = new;
+            if (!saw_digit)
+              {
+                if (++octets > 4)
+                  return (0);
+                saw_digit = 1;
+              }
+          }
+        else if (ch == '.' && saw_digit)
+          {
+            if (octets == 4)
+              return (0);
+            *++tp = 0;
+            saw_digit = 0;
+          }
+        else
+          return (0);
+      }
+    if (octets < 4)
+      return (0);
+  }
+  memcpy (dst, tmp, NS_INADDRSZ);
+  return (1);
+}
+
+# if HAVE_IPV6
+
+/* int
+ * inet_pton6(src, dst)
+ *      convert presentation level 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.
+ */
+static int
+inet_pton6 (const char *restrict src, unsigned char *restrict dst)
+{
+  static const char xdigits[] = "0123456789abcdef";
+  unsigned char tmp[NS_IN6ADDRSZ];
+
+  /* Leading :: requires some special handling. */
+  if (*src == ':')
+    if (*++src != ':')
+      return (0);
+
+  {
+    unsigned char *tp = memset (tmp, '\0', NS_IN6ADDRSZ);
+    unsigned char *endp = tp + NS_IN6ADDRSZ;
+    unsigned char *colonp = NULL;
+    const char *curtok = src;
+    int saw_xdigit = 0;
+    unsigned int val = 0;
+    int ch;
+    while ((ch = c_tolower (*src++)) != '\0')
+      {
+        const char *pch = strchr (xdigits, ch);
+        if (pch != NULL)
+          {
+            val <<= 4;
+            val |= (pch - xdigits);
+            if (val > 0xffff)
+              return (0);
+            saw_xdigit = 1;
+          }
+        else if (ch == ':')
+          {
+            curtok = src;
+            if (!saw_xdigit)
+              {
+                if (colonp)
+                  return (0);
+                colonp = tp;
+              }
+            else if (*src == '\0')
+              return (0);
+            else if (tp + NS_INT16SZ > endp)
+              return (0);
+            else
+              {
+                *tp++ = (unsigned char) (val >> 8) & 0xff;
+                *tp++ = (unsigned char) val & 0xff;
+                saw_xdigit = 0;
+                val = 0;
+              }
+          }
+        else if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
+            inet_pton4 (curtok, tp) > 0)
+          {
+            tp += NS_INADDRSZ;
+            saw_xdigit = 0;
+            break;                /* '\0' was seen by inet_pton4(). */
+          }
+        else
+          return (0);
+      }
+    if (saw_xdigit)
+      {
+        if (tp + NS_INT16SZ > endp)
+          return (0);
+        *tp++ = (unsigned char) (val >> 8) & 0xff;
+        *tp++ = (unsigned char) val & 0xff;
+      }
+    if (colonp != NULL)
+      {
+        if (tp == endp)
+          return (0);
+        /*
+         * Since some memmove()'s erroneously fail to handle
+         * overlapping regions, we'll do the shift by hand.
+         */
+        const int n = tp - colonp;
+        for (int 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);
+}
+
+# endif
+
+#endif