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/cdefs.h>
  33
  34 #include <sys/param.h>
  35 #include <sys/types.h>
  36 #include <sys/socket.h>
  37 #include <sys/sysctl.h>
  38
  39 #include <netinet/in.h>
  40 #include <netinet/tcp.h>
  41 #include <arpa/inet.h>
  42 #if __FreeBSD_version < 500000
  43 #include <sys/time.h>
  44 #endif
  45 #include <stdlib.h>
  46 #include <stdio.h>
  47 #include <string.h>
  48
  49 #include "misc.h"
  50
  51 static inline char
  52 c2b(unsigned char c)
  53 {
  54      switch(c) {
  55      case '0' ... '9':
  56           return c - '0';
  57      case 'a' ... 'f':
  58           return c - 'a' + 10;
  59      case 'A' ... 'F':
  60           return c - 'A' + 10;
  61      }
  62      return 0;
  63 }
  64
  65 static char     base64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
  66                            "abcdefghijklmnopqrstuvwxyz"
  67                            "0123456789+/";
  68
  69 static __inline unsigned char
  70 c64tobin(unsigned char c64)
  71 {
  72      int        i;
  73      for(i = 0; i < 64; i++)
  74           if(base64[i] == c64)
  75                break;
  76      return i;
  77 }
  78 /*
  79  | according to rfc3720, the binary string
  80  | cannot be larger than 1024 - but i can't find it :-) XXX
  81  | not enforced yet.
  82  */
  83 int
  84 str2bin(char *str, char **rsp)
  85 {
  86      char       *src, *dst, *tmp;
  87      int        i, len = 0;
  88
  89      src = str;
  90      tmp = NULL;
  91      if(strncasecmp("0x", src, 2) == 0) {
  92           src += 2;
  93           len = strlen(src);
  94
  95           if((tmp = malloc((len+1)/2)) == NULL) {
  96                // XXX: print some error?
  97                return 0;
  98           }
  99           dst = tmp;
 100           if(len & 1)
 101                *dst++ = c2b(*src++);
 102           while(*src) {
 103                *dst = c2b(*src++) << 4;
 104                *dst++ |= c2b(*src++);
 105           }
 106           len = dst - tmp;
 107      } else
 108      if(strncasecmp("0b", src , 2) == 0) {
 109           // base64
 110           unsigned char b6;
 111
 112           src += 2;
 113           len = strlen(src) / 4 * 3;
 114           if((tmp = malloc(len)) == NULL) {
 115                // XXX: print some error?
 116                return 0;
 117           }
 118           dst = tmp;
 119           i = 0;
 120           while(*src && ((b6 = c64tobin(*src++)) != 64)) {
 121                switch(i % 4) {
 122                case 0:
 123                     *dst = b6 << 2;
 124                     break;
 125                case 1:
 126                     *dst++ |= b6 >> 4;
 127                     *dst = b6 << 4;
 128                     break;
 129                case 2:
 130                     *dst++ |= b6 >> 2;
 131                     *dst = b6 << 6;
 132                     break;
 133                case 3:
 134                     *dst++ |= b6;
 135                     break;
 136                }
 137                i++;
 138           }
 139           len = dst - tmp;
 140      }
 141      else {
 142           /*
 143            | assume it to be an ascii string, so just copy it
 144            */
 145           len = strlen(str);
 146           if((tmp = malloc(len)) == NULL)
 147                return 0;
 148           dst = tmp;
 149           src = str;
 150           while(*src)
 151                *dst++ = *src++;
 152      }
 153
 154      *rsp = tmp;
 155      return len;
 156 }
 157
 158 char *
 159 bin2str(char *encoding, unsigned char *md, int blen)
 160 {
 161      int        len;
 162      char       *dst, *ds;
 163      unsigned char *cp;
 164
 165      if(strncasecmp(encoding, "0x", 2) == 0) {
 166           char  ofmt[5];
 167
 168           len = blen * 2;
 169           dst = malloc(len + 3);
 170           strcpy(dst, encoding);
 171           ds = dst + 2;
 172           cp = md;
 173           sprintf(ofmt, "%%02%c", encoding[1]);
 174           while(blen-- > 0) {
 175                sprintf(ds, ofmt, *cp++);
 176                ds += 2;
 177           }
 178           *ds = 0;
 179           return dst;
 180      }
 181      if(strncasecmp(encoding, "0b", 2) == 0) {
 182           int i, b6;
 183
 184           len = (blen + 2) * 4 / 3;
 185           dst = malloc(len + 3);
 186           strcpy(dst, encoding);
 187           ds = dst + 2;
 188           cp = md;
 189           b6 = 0; // to keep compiler happy.
 190           for(i = 0; i < blen; i++) {
 191                switch(i % 3) {
 192                case 0:
 193                     *ds++ = base64[*cp >> 2];
 194                     b6 = (*cp & 0x3) << 4;
 195                     break;
 196                case 1:
 197                     b6 += (*cp >> 4);
 198                     *ds++ = base64[b6];
 199                     b6 = (*cp & 0xf) << 2;
 200                     break;
 201                case 2:
 202                     b6 += (*cp >> 6);
 203                     *ds++ = base64[b6];
 204                     *ds++ = base64[*cp & 0x3f];
 205                }
 206                cp++;
 207           }
 208           switch(blen % 3) {
 209           case 0:
 210                break;
 211           case 1:
 212                *ds++ = base64[b6];
 213                *ds++ = '=';
 214                *ds++ = '=';
 215                break;
 216           case 2:
 217                *ds++ = base64[b6];
 218                *ds++ = '=';
 219                break;
 220           }
 221
 222           *ds = 0;
 223           return dst;
 224      }
 225
 226      return NULL;
 227 }