sbin/iscontrol/misc.c

   1 /*-
   2  * Copyright (c) 2005-2008 Daniel Braniss <danny@cs.huji.ac.il>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  */
  27
  28 /*
  29  | $Id: misc.c,v 2.1 2006/11/12 08:06:51 danny Exp $
  30  */
  31
  32 #include <sys/param.h>
  33 #include <sys/types.h>
  34 #include <sys/socket.h>
  35 #include <sys/sysctl.h>
  36
  37 #include <netinet/in.h>
  38 #include <netinet/tcp.h>
  39 #include <arpa/inet.h>
  40 #include <stdlib.h>
  41 #include <stdio.h>
  42 #include <string.h>
  43
  44 #include "misc.h"
  45
  46 static inline char
  47 c2b(unsigned char c)
  48 {
  49      switch(c) {
  50      case '0' ... '9':
  51           return c - '0';
  52      case 'a' ... 'f':
  53           return c - 'a' + 10;
  54      case 'A' ... 'F':
  55           return c - 'A' + 10;
  56      }
  57      return 0;
  58 }
  59
  60 static char     base64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
  61                            "abcdefghijklmnopqrstuvwxyz"
  62                            "0123456789+/";
  63
  64 static __inline unsigned char
  65 c64tobin(unsigned char c64)
  66 {
  67      int        i;
  68      for(i = 0; i < 64; i++)
  69           if(base64[i] == c64)
  70                break;
  71      return i;
  72 }
  73 /*
  74  | according to rfc3720, the binary string
  75  | cannot be larger than 1024 - but i can't find it :-) XXX
  76  | not enforced yet.
  77  */
  78 int
  79 str2bin(char *str, char **rsp)
  80 {
  81      char       *src, *dst, *tmp;
  82      int        i, len = 0;
  83
  84      src = str;
  85      tmp = NULL;
  86      if(strncasecmp("0x", src, 2) == 0) {
  87           src += 2;
  88           len = strlen(src);
  89
  90           if((tmp = malloc((len+1)/2)) == NULL) {
  91                // XXX: print some error?
  92                return 0;
  93           }
  94           dst = tmp;
  95           if(len & 1)
  96                *dst++ = c2b(*src++);
  97           while(*src) {
  98                *dst = c2b(*src++) << 4;
  99                *dst++ |= c2b(*src++);
 100           }
 101           len = dst - tmp;
 102      } else
 103      if(strncasecmp("0b", src , 2) == 0) {
 104           // base64
 105           unsigned char b6;
 106
 107           src += 2;
 108           len = strlen(src) / 4 * 3;
 109           if((tmp = malloc(len)) == NULL) {
 110                // XXX: print some error?
 111                return 0;
 112           }
 113           dst = tmp;
 114           i = 0;
 115           while(*src && ((b6 = c64tobin(*src++)) != 64)) {
 116                switch(i % 4) {
 117                case 0:
 118                     *dst = b6 << 2;
 119                     break;
 120                case 1:
 121                     *dst++ |= b6 >> 4;
 122                     *dst = b6 << 4;
 123                     break;
 124                case 2:
 125                     *dst++ |= b6 >> 2;
 126                     *dst = b6 << 6;
 127                     break;
 128                case 3:
 129                     *dst++ |= b6;
 130                     break;
 131                }
 132                i++;
 133           }
 134           len = dst - tmp;
 135      }
 136      else {
 137           /*
 138            | assume it to be an ascii string, so just copy it
 139            */
 140           len = strlen(str);
 141           if((tmp = malloc(len)) == NULL)
 142                return 0;
 143           dst = tmp;
 144           src = str;
 145           while(*src)
 146                *dst++ = *src++;
 147      }
 148
 149      *rsp = tmp;
 150      return len;
 151 }
 152
 153 char *
 154 bin2str(char *encoding, unsigned char *md, int blen)
 155 {
 156      int        len;
 157      char       *dst, *ds;
 158      unsigned char *cp;
 159
 160      if(strncasecmp(encoding, "0x", 2) == 0) {
 161           char  ofmt[5];
 162
 163           len = blen * 2;
 164           dst = malloc(len + 3);
 165           strcpy(dst, encoding);
 166           ds = dst + 2;
 167           cp = md;
 168           sprintf(ofmt, "%%02%c", encoding[1]);
 169           while(blen-- > 0) {
 170                sprintf(ds, ofmt, *cp++);
 171                ds += 2;
 172           }
 173           *ds = 0;
 174           return dst;
 175      }
 176      if(strncasecmp(encoding, "0b", 2) == 0) {
 177           int i, b6;
 178
 179           len = (blen + 2) * 4 / 3;
 180           dst = malloc(len + 3);
 181           strcpy(dst, encoding);
 182           ds = dst + 2;
 183           cp = md;
 184           b6 = 0; // to keep compiler happy.
 185           for(i = 0; i < blen; i++) {
 186                switch(i % 3) {
 187                case 0:
 188                     *ds++ = base64[*cp >> 2];
 189                     b6 = (*cp & 0x3) << 4;
 190                     break;
 191                case 1:
 192                     b6 += (*cp >> 4);
 193                     *ds++ = base64[b6];
 194                     b6 = (*cp & 0xf) << 2;
 195                     break;
 196                case 2:
 197                     b6 += (*cp >> 6);
 198                     *ds++ = base64[b6];
 199                     *ds++ = base64[*cp & 0x3f];
 200                }
 201                cp++;
 202           }
 203           switch(blen % 3) {
 204           case 0:
 205                break;
 206           case 1:
 207                *ds++ = base64[b6];
 208                *ds++ = '=';
 209                *ds++ = '=';
 210                break;
 211           case 2:
 212                *ds++ = base64[b6];
 213                *ds++ = '=';
 214                break;
 215           }
 216
 217           *ds = 0;
 218           return dst;
 219      }
 220
 221      return NULL;
 222 }