1  /*
       2   * Copyright (c) 1996-1999 by Internet Software Consortium.
       3   *
       4   * Permission to use, copy, modify, and distribute this software for any
       5   * purpose with or without fee is hereby granted, provided that the above
       6   * copyright notice and this permission notice appear in all copies.
       7   *
       8   * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
       9   * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
      10   * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
      11   * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
      12   * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
      13   * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
      14   * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
      15   * SOFTWARE.
      16   */
      17  
      18  #include <sys/types.h>
      19  #include <sys/param.h>
      20  #include <sys/socket.h>
      21  
      22  #include <netinet/in.h>
      23  #include <arpa/inet.h>
      24  #include <arpa/nameser.h>
      25  
      26  #include <ctype.h>
      27  #include <resolv.h>
      28  
      29  static char
      30  xtob(int c) {
      31  	return (c - (((c >= '0') && (c <= '9')) ? '0' : '7'));
      32  }
      33  
      34  u_int
      35  inet_nsap_addr(const char *ascii, u_char *binary, int maxlen) {
      36  	u_char c, nib;
      37  	u_int len = 0;
      38  
      39  	while ((c = *ascii++) != '\0' && len < (u_int)maxlen) {
      40  		if (c == '.' || c == '+' || c == '/')
      41  			continue;
      42  		if (!isascii(c))
      43  			return (0);
      44  		c = toupper(c);
      45  		if (isxdigit(c)) {
      46  			nib = xtob(c);
      47  			c = *ascii++;
      48  			if (c != '\0') {
      49  				c = toupper(c);
      50  				if (isxdigit(c)) {
      51  					*binary++ = (nib << 4) | xtob(c);
      52  					len++;
      53  				} else
      54  					return (0);
      55  			}
      56  			else
      57  				return (0);
      58  		}
      59  		else
      60  			return (0);
      61  	}
      62  	return (len);
      63  }
      64  
      65  char *
      66  inet_nsap_ntoa(int binlen, const u_char *binary, char *ascii) {
      67  	int nib;
      68  	int i;
      69  	static char tmpbuf[255*2 + 128];
      70  	char *start;
      71  
      72  	if (ascii)
      73  		start = ascii;
      74  	else {
      75  		ascii = tmpbuf;
      76  		start = tmpbuf;
      77  	}
      78  
      79  	if (binlen > 255)
      80  		binlen = 255;
      81  
      82  	for (i = 0; i < binlen; i++) {
      83  		nib = *binary >> 4;
      84  		*ascii++ = nib + (nib < 10 ? '0' : '7');
      85  		nib = *binary++ & 0x0f;
      86  		*ascii++ = nib + (nib < 10 ? '0' : '7');
      87  		if (((i % 2) == 0 && (i + 1) < binlen))
      88  			*ascii++ = '.';
      89  	}
      90  	*ascii = '\0';
      91  	return (start);
      92  }