src/icp_v3.cc

   1
   2 /*
   3  * $Id: icp_v3.cc,v 1.26 1998/09/21 06:52:16 wessels Exp $
   4  *
   5  * DEBUG: section 12    Internet Cache Protocol
   6  * AUTHOR: Duane Wessels
   7  *
   8  * SQUID Internet Object Cache  http://squid.nlanr.net/Squid/
   9  * ----------------------------------------------------------
  10  *
  11  *  Squid is the result of efforts by numerous individuals from the
  12  *  Internet community.  Development is led by Duane Wessels of the
  13  *  National Laboratory for Applied Network Research and funded by the
  14  *  National Science Foundation.  Squid is Copyrighted (C) 1998 by
  15  *  Duane Wessels and the University of California San Diego.  Please
  16  *  see the COPYRIGHT file for full details.  Squid incorporates
  17  *  software developed and/or copyrighted by other sources.  Please see
  18  *  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
  38 /* Currently Harvest cached-2.x uses ICP_VERSION_3 */
  39 void
  40 icpHandleIcpV3(int fd, struct sockaddr_in from, char *buf, int len)
  41 {
  42     icp_common_t header;
  43     icp_common_t *reply;
  44     StoreEntry *entry = NULL;
  45     char *url = NULL;
  46     const cache_key *key;
  47     request_t *icp_request = NULL;
  48     int allow = 0;
  49     aclCheck_t checklist;
  50     xmemcpy(&header, buf, sizeof(icp_common_t));
  51     /*
  52      * Only these fields need to be converted
  53      */
  54     header.length = ntohs(header.length);
  55     header.reqnum = ntohl(header.reqnum);
  56     header.flags = ntohl(header.flags);
  57     header.pad = ntohl(header.pad);
  58
  59     switch (header.opcode) {
  60     case ICP_QUERY:
  61         /* We have a valid packet */
  62         url = buf + sizeof(icp_common_t) + sizeof(u_num32);
  63         if (strpbrk(url, w_space)) {
  64             url = rfc1738_escape(url);
  65             reply = icpCreateMessage(ICP_ERR, 0, url, header.reqnum, 0);
  66             icpUdpSend(fd, &from, reply, LOG_UDP_INVALID, 0);
  67             break;
  68         }
  69         if ((icp_request = urlParse(METHOD_GET, url)) == NULL) {
  70             reply = icpCreateMessage(ICP_ERR, 0, url, header.reqnum, 0);
  71             icpUdpSend(fd, &from, reply, LOG_UDP_INVALID, 0);
  72             break;
  73         }
  74         checklist.src_addr = from.sin_addr;
  75         checklist.request = icp_request;
  76         allow = aclCheckFast(Config.accessList.icp, &checklist);
  77         if (!allow) {
  78             debug(12, 2) ("icpHandleIcpV3: Access Denied for %s by %s.\n",
  79                 inet_ntoa(from.sin_addr), AclMatchedName);
  80             if (clientdbCutoffDenied(from.sin_addr)) {
  81                 /*
  82                  * count this DENIED query in the clientdb, even though
  83                  * we're not sending an ICP reply...
  84                  */
  85                 clientdbUpdate(from.sin_addr, LOG_UDP_DENIED, PROTO_ICP, 0);
  86             } else {
  87                 reply = icpCreateMessage(ICP_DENIED, 0, url, header.reqnum, 0);
  88                 icpUdpSend(fd, &from, reply, LOG_UDP_DENIED, 0);
  89             }
  90             break;
  91         }
  92         /* The peer is allowed to use this cache */
  93         entry = storeGetPublic(url, METHOD_GET);
  94         debug(12, 5) ("icpHandleIcpV3: OPCODE %s\n",
  95             icp_opcode_str[header.opcode]);
  96         if (icpCheckUdpHit(entry, icp_request)) {
  97             reply = icpCreateMessage(ICP_HIT, 0, url, header.reqnum, 0);
  98             icpUdpSend(fd, &from, reply, LOG_UDP_HIT, 0);
  99             break;
 100         }
 101         /* if store is rebuilding, return a UDP_HIT, but not a MISS */
 102         if (opt_reload_hit_only && store_rebuilding) {
 103             reply = icpCreateMessage(ICP_MISS_NOFETCH, 0, url, header.reqnum, 0);
 104             icpUdpSend(fd, &from, reply, LOG_UDP_MISS_NOFETCH, 0);
 105         } else if (hit_only_mode_until > squid_curtime) {
 106             reply = icpCreateMessage(ICP_MISS_NOFETCH, 0, url, header.reqnum, 0);
 107             icpUdpSend(fd, &from, reply, LOG_UDP_MISS_NOFETCH, 0);
 108         } else {
 109             reply = icpCreateMessage(ICP_MISS, 0, url, header.reqnum, 0);
 110             icpUdpSend(fd, &from, reply, LOG_UDP_MISS, 0);
 111         }
 112         break;
 113
 114     case ICP_HIT:
 115     case ICP_SECHO:
 116     case ICP_DECHO:
 117     case ICP_MISS:
 118     case ICP_DENIED:
 119     case ICP_MISS_NOFETCH:
 120         if (neighbors_do_private_keys && header.reqnum == 0) {
 121             debug(12, 0) ("icpHandleIcpV3: Neighbor %s returned reqnum = 0\n",
 122                 inet_ntoa(from.sin_addr));
 123             debug(12, 0) ("icpHandleIcpV3: Disabling use of private keys\n");
 124             neighbors_do_private_keys = 0;
 125         }
 126         url = buf + sizeof(icp_common_t);
 127         debug(12, 3) ("icpHandleIcpV3: %s from %s for '%s'\n",
 128             icp_opcode_str[header.opcode],
 129             inet_ntoa(from.sin_addr),
 130             url);
 131         key = icpGetCacheKey(url, (int) header.reqnum);
 132         /* call neighborsUdpAck even if ping_status != PING_WAITING */
 133         neighborsUdpAck(key, &header, &from);
 134         break;
 135
 136     case ICP_INVALID:
 137     case ICP_ERR:
 138         break;
 139
 140     default:
 141         debug(12, 0) ("icpHandleIcpV3: UNKNOWN OPCODE: %d from %s\n",
 142             header.opcode, inet_ntoa(from.sin_addr));
 143         break;
 144     }
 145     if (icp_request)
 146         requestDestroy(icp_request);
 147 }