kc3-lang/gnulib/lib/inet_pton.c

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• Hash : 32a72f45
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  Date : 2023-01-01T01:14:21
  

  maint: run 'make update-copyright'
  

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• lib/inet_pton.c

• /* inet_pton.c -- convert IPv4 and IPv6 addresses from text to binary form
  
     Copyright (C) 2006, 2008-2023 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)
  {
    int saw_digit, octets, ch;
    unsigned char tmp[NS_INADDRSZ], *tp;
  
    saw_digit = 0;
    octets = 0;
    *(tp = tmp) = 0;
    while ((ch = *src++) != '\0')
      {
  
        if (ch >= '0' && ch <= '9')
          {
            unsigned new = *tp * 10 + (ch - '0');
  
            if (saw_digit && *tp == 0)
              return (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], *tp, *endp, *colonp;
    const char *curtok;
    int ch, saw_xdigit;
    unsigned val;
  
    tp = memset (tmp, '\0', NS_IN6ADDRSZ);
    endp = tp + NS_IN6ADDRSZ;
    colonp = NULL;
    /* Leading :: requires some special handling. */
    if (*src == ':')
      if (*++src != ':')
        return (0);
    curtok = src;
    saw_xdigit = 0;
    val = 0;
    while ((ch = c_tolower (*src++)) != '\0')
      {
        const char *pch;
  
        pch = strchr (xdigits, ch);
        if (pch != NULL)
          {
            val <<= 4;
            val |= (pch - xdigits);
            if (val > 0xffff)
              return (0);
            saw_xdigit = 1;
            continue;
          }
        if (ch == ':')
          {
            curtok = src;
            if (!saw_xdigit)
              {
                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;
            saw_xdigit = 0;
            val = 0;
            continue;
          }
        if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
            inet_pton4 (curtok, tp) > 0)
          {
            tp += NS_INADDRSZ;
            saw_xdigit = 0;
            break;                /* '\0' was seen by inet_pton4(). */
          }
        return (0);
      }
    if (saw_xdigit)
      {
        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 int 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);
  }
  
  # endif
  
  #endif
  

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