src/icp_v3.cc

   1
   2 /*
   3  * $Id: icp_v3.cc,v 1.42 2007/04/28 22:26:37 hno Exp $
   4  *
   5  * DEBUG: section 12    Internet Cache Protocol
   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 "Store.h"
  38 #include "ICP.h"
  39 #include "HttpRequest.h"
  40
  41 class ICP3State : public ICPState, public StoreClient
  42 {
  43
  44 public:
  45     ICP3State(icp_common_t &aHeader, HttpRequest *aRequest):
  46         ICPState(aHeader, aRequest)
  47         {}
  48
  49     ~ICP3State();
  50     void created (StoreEntry *newEntry);
  51 };
  52
  53 static void
  54
  55 doV3Query(int fd, struct sockaddr_in from, char *buf, icp_common_t header)
  56 {
  57     /* We have a valid packet */
  58     char *url = buf + sizeof(icp_common_t) + sizeof(u_int32_t);
  59     HttpRequest *icp_request = icpGetRequest (url, header.reqnum, fd, &from);
  60
  61     if (!icp_request)
  62         return;
  63
  64     if (!icpAccessAllowed(&from, icp_request))
  65     {
  66         icpDenyAccess (&from, url, header.reqnum, fd);
  67         delete icp_request;
  68         return;
  69     }
  70
  71     /* The peer is allowed to use this cache */
  72     ICP3State *state = new ICP3State (header, icp_request);
  73
  74     state->fd = fd;
  75
  76     state->from = from;
  77
  78     state->url = xstrdup (url);
  79
  80     StoreEntry::getPublic (state, url, METHOD_GET);
  81 }
  82
  83 ICP3State::~ICP3State ()
  84 {}
  85
  86 void
  87 ICP3State::created (StoreEntry *newEntry)
  88 {
  89     StoreEntry *entry = newEntry->isNull () ? NULL : newEntry;
  90     debugs(12, 5, "icpHandleIcpV3: OPCODE " << icp_opcode_str[header.opcode]);
  91     icp_opcode codeToSend;
  92
  93     if (icpCheckUdpHit(entry, request)) {
  94         codeToSend = ICP_HIT;
  95     } else if (icpGetCommonOpcode() == ICP_ERR)
  96         codeToSend = ICP_MISS;
  97     else
  98         codeToSend = icpGetCommonOpcode();
  99
 100     icpCreateAndSend (codeToSend, 0, url, header.reqnum, 0, fd, &from);
 101
 102     delete this;
 103 }
 104
 105 /* Currently Harvest cached-2.x uses ICP_VERSION_3 */
 106 void
 107
 108 icpHandleIcpV3(int fd, struct sockaddr_in from, char *buf, int len)
 109 {
 110     if (len <= 0)
 111     {
 112         debugs(12, 3, "icpHandleIcpV3: ICP message is too small");
 113         return;
 114     }
 115
 116     icp_common_t header (buf, len);
 117     /*
 118      * Length field should match the number of bytes read
 119      */
 120
 121     if (len != header.length)
 122     {
 123         debugs(12, 3, "icpHandleIcpV3: ICP message is too small");
 124         return;
 125     }
 126
 127     switch (header.opcode)
 128     {
 129
 130     case ICP_QUERY:
 131         doV3Query(fd, from,buf, header);
 132         break;
 133
 134     case ICP_HIT:
 135 #if ALLOW_SOURCE_PING
 136
 137     case ICP_SECHO:
 138 #endif
 139
 140     case ICP_DECHO:
 141
 142     case ICP_MISS:
 143
 144     case ICP_DENIED:
 145
 146     case ICP_MISS_NOFETCH:
 147         header.handleReply(buf, &from);
 148         break;
 149
 150     case ICP_INVALID:
 151
 152     case ICP_ERR:
 153         break;
 154
 155     default:
 156         debugs(12, 0, "icpHandleIcpV3: UNKNOWN OPCODE: " << header.opcode << " from " << inet_ntoa(from.sin_addr));
 157         break;
 158     }
 159 }