src/store_key_md5.cc

   1
   2 /*
   3  * $Id$
   4  *
   5  * DEBUG: section 20    Storage Manager MD5 Cache Keys
   6  * AUTHOR: Duane Wessels
   7  *
   8  * SQUID Web Proxy Cache          http://www.squid-cache.org/
   9  * ----------------------------------------------------------
  10  *
  11  *  Squid is the result of efforts by numerous individuals from
  12  *  the Internet community; see the CONTRIBUTORS file for full
  13  *  details.   Many organizations have provided support for Squid's
  14  *  development; see the SPONSORS file for full details.  Squid is
  15  *  Copyrighted (C) 2001 by the Regents of the University of
  16  *  California; see the COPYRIGHT file for full details.  Squid
  17  *  incorporates software developed and/or copyrighted by other
  18  *  sources; see the CREDITS file for full details.
  19  *
  20  *  This program is free software; you can redistribute it and/or modify
  21  *  it under the terms of the GNU General Public License as published by
  22  *  the Free Software Foundation; either version 2 of the License, or
  23  *  (at your option) any later version.
  24  *
  25  *  This program is distributed in the hope that it will be useful,
  26  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  27  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  28  *  GNU General Public License for more details.
  29  *
  30  *  You should have received a copy of the GNU General Public License
  31  *  along with this program; if not, write to the Free Software
  32  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
  33  *
  34  */
  35
  36 #include "squid.h"
  37 #include "HttpRequest.h"
  38 #include "md5.h"
  39 #include "Mem.h"
  40 #include "store_key_md5.h"
  41 #include "URL.h"
  42
  43 static cache_key null_key[SQUID_MD5_DIGEST_LENGTH];
  44
  45 const char *
  46 storeKeyText(const cache_key *key)
  47 {
  48     static char buf[SQUID_MD5_DIGEST_LENGTH * 2+1];
  49     int i;
  50
  51     for (i = 0; i < SQUID_MD5_DIGEST_LENGTH; ++i)
  52         snprintf(&buf[i*2],sizeof(buf) - i*2, "%02X", *(key + i));
  53
  54     return buf;
  55 }
  56
  57 const cache_key *
  58 storeKeyScan(const char *buf)
  59 {
  60     static unsigned char digest[SQUID_MD5_DIGEST_LENGTH];
  61     int i;
  62     int j = 0;
  63     char t[3];
  64
  65     for (i = 0; i < SQUID_MD5_DIGEST_LENGTH; ++i) {
  66         t[0] = *(buf + (j++));
  67         t[1] = *(buf + (j++));
  68         t[2] = '\0';
  69         *(digest + i) = (unsigned char) strtol(t, NULL, 16);
  70     }
  71
  72     return digest;
  73 }
  74
  75 int
  76 storeKeyHashCmp(const void *a, const void *b)
  77 {
  78     const unsigned char *A = (const unsigned char *)a;
  79     const unsigned char *B = (const unsigned char *)b;
  80     int i;
  81
  82     for (i = 0; i < SQUID_MD5_DIGEST_LENGTH; ++i) {
  83         if (A[i] < B[i])
  84             return -1;
  85
  86         if (A[i] > B[i])
  87             return 1;
  88     }
  89
  90     return 0;
  91 }
  92
  93 unsigned int
  94 storeKeyHashHash(const void *key, unsigned int n)
  95 {
  96     /* note, n must be a power of 2! */
  97     const unsigned char *digest = (const unsigned char *)key;
  98     unsigned int i = digest[0]
  99                      | digest[1] << 8
 100                      | digest[2] << 16
 101                      | digest[3] << 24;
 102     return (i & (--n));
 103 }
 104
 105 const cache_key *
 106 storeKeyPrivate(const char *url, const HttpRequestMethod& method, int id)
 107 {
 108     static cache_key digest[SQUID_MD5_DIGEST_LENGTH];
 109     SquidMD5_CTX M;
 110     assert(id > 0);
 111     debugs(20, 3, "storeKeyPrivate: " << RequestMethodStr(method) << " " << url);
 112     SquidMD5Init(&M);
 113     SquidMD5Update(&M, (unsigned char *) &id, sizeof(id));
 114     SquidMD5Update(&M, (unsigned char *) &method, sizeof(method));
 115     SquidMD5Update(&M, (unsigned char *) url, strlen(url));
 116     SquidMD5Final(digest, &M);
 117     return digest;
 118 }
 119
 120 const cache_key *
 121 storeKeyPublic(const char *url, const HttpRequestMethod& method)
 122 {
 123     static cache_key digest[SQUID_MD5_DIGEST_LENGTH];
 124     unsigned char m = (unsigned char) method.id();
 125     SquidMD5_CTX M;
 126     SquidMD5Init(&M);
 127     SquidMD5Update(&M, &m, sizeof(m));
 128     SquidMD5Update(&M, (unsigned char *) url, strlen(url));
 129     SquidMD5Final(digest, &M);
 130     return digest;
 131 }
 132
 133 const cache_key *
 134 storeKeyPublicByRequest(HttpRequest * request)
 135 {
 136     return storeKeyPublicByRequestMethod(request, request->method);
 137 }
 138
 139 const cache_key *
 140 storeKeyPublicByRequestMethod(HttpRequest * request, const HttpRequestMethod& method)
 141 {
 142     static cache_key digest[SQUID_MD5_DIGEST_LENGTH];
 143     unsigned char m = (unsigned char) method.id();
 144     const char *url = urlCanonical(request);
 145     SquidMD5_CTX M;
 146     SquidMD5Init(&M);
 147     SquidMD5Update(&M, &m, sizeof(m));
 148     SquidMD5Update(&M, (unsigned char *) url, strlen(url));
 149
 150     if (request->vary_headers)
 151         SquidMD5Update(&M, (unsigned char *) request->vary_headers, strlen(request->vary_headers));
 152
 153     SquidMD5Final(digest, &M);
 154
 155     return digest;
 156 }
 157
 158 cache_key *
 159 storeKeyDup(const cache_key * key)
 160 {
 161     cache_key *dup = (cache_key *)memAllocate(MEM_MD5_DIGEST);
 162     memcpy(dup, key, SQUID_MD5_DIGEST_LENGTH);
 163     return dup;
 164 }
 165
 166 cache_key *
 167 storeKeyCopy(cache_key * dst, const cache_key * src)
 168 {
 169     memcpy(dst, src, SQUID_MD5_DIGEST_LENGTH);
 170     return dst;
 171 }
 172
 173 void
 174 storeKeyFree(const cache_key * key)
 175 {
 176     memFree((void *) key, MEM_MD5_DIGEST);
 177 }
 178
 179 int
 180 storeKeyHashBuckets(int nbuckets)
 181 {
 182     int n = 0x2000;
 183
 184     while (n < nbuckets)
 185         n <<= 1;
 186
 187     return n;
 188 }
 189
 190 int
 191 storeKeyNull(const cache_key * key)
 192 {
 193     if (memcmp(key, null_key, SQUID_MD5_DIGEST_LENGTH) == 0)
 194         return 1;
 195     else
 196         return 0;
 197 }
 198
 199 void
 200 storeKeyInit(void)
 201 {
 202     memset(null_key, '\0', SQUID_MD5_DIGEST_LENGTH);
 203 }