src/icp_v3.cc

   1
   2 /*
   3  * $Id: icp_v3.cc,v 1.35 2002/10/13 20:35:01 robertc 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
  40 class ICP3State : public ICPState, public StoreClient {
  41 public:
  42     ICP3State(icp_common_t &aHeader):ICPState(aHeader){}
  43     ~ICP3State();
  44     void created (StoreEntry *newEntry);
  45 };
  46
  47 static void
  48 doV3Query(int fd, struct sockaddr_in from, char *buf, icp_common_t header)
  49 {
  50     /* We have a valid packet */
  51     char *url = buf + sizeof(icp_common_t) + sizeof(u_int32_t);
  52     request_t *icp_request = icpGetRequest (url, header.reqnum, fd, &from);
  53     if (!icp_request)
  54         return;
  55     if (!icpAccessAllowed(&from, icp_request)) {
  56         icpDenyAccess (&from, url, header.reqnum, fd);
  57         requestDestroy(icp_request);
  58         return;
  59     }
  60     /* The peer is allowed to use this cache */
  61     ICP3State *state = new ICP3State (header);
  62     state->request = icp_request;
  63     state->fd = fd;
  64     state->from = from;
  65     state->url = xstrdup (url);
  66     _StoreEntry::getPublic (state, url, METHOD_GET);
  67 }
  68
  69 ICP3State::~ICP3State ()
  70 {
  71 }
  72
  73 void
  74 ICP3State::created (StoreEntry *newEntry)
  75 {
  76     StoreEntry *entry = newEntry->isNull () ? NULL : newEntry;
  77     debug(12, 5) ("icpHandleIcpV3: OPCODE %s\n",
  78         icp_opcode_str[header.opcode]);
  79     icp_opcode codeToSend;
  80     if (icpCheckUdpHit(entry, request)) {
  81         codeToSend = ICP_HIT;
  82     } else if (icpGetCommonOpcode() == ICP_ERR)
  83         codeToSend = ICP_MISS;
  84     else
  85         codeToSend = icpGetCommonOpcode();
  86     icpCreateAndSend (codeToSend, 0, url, header.reqnum, 0, fd, &from);
  87     delete this;
  88 }
  89
  90 /* Currently Harvest cached-2.x uses ICP_VERSION_3 */
  91 void
  92 icpHandleIcpV3(int fd, struct sockaddr_in from, char *buf, int len)
  93 {
  94     if (len <= 0) {
  95         debug(12, 3) ("icpHandleIcpV3: ICP message is too small\n");
  96         return;
  97     }
  98     icp_common_t header (buf, len);
  99     /*
 100      * Length field should match the number of bytes read
 101      */
 102     if (len != header.length) {
 103         debug(12, 3) ("icpHandleIcpV3: ICP message is too small\n");
 104         return;
 105     }
 106     switch (header.opcode) {
 107     case ICP_QUERY:
 108         doV3Query(fd, from,buf, header);
 109         break;
 110
 111     case ICP_HIT:
 112 #if ALLOW_SOURCE_PING
 113     case ICP_SECHO:
 114 #endif
 115     case ICP_DECHO:
 116     case ICP_MISS:
 117     case ICP_DENIED:
 118     case ICP_MISS_NOFETCH:
 119         header.handleReply(buf, &from);
 120         break;
 121
 122     case ICP_INVALID:
 123     case ICP_ERR:
 124         break;
 125
 126     default:
 127         debug(12, 0) ("icpHandleIcpV3: UNKNOWN OPCODE: %d from %s\n",
 128             header.opcode, inet_ntoa(from.sin_addr));
 129         break;
 130     }
 131 }