src/store_key_md5.cc

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