src/icp_v3.cc

   1
   2 /*
   3  * $Id: icp_v3.cc,v 1.30 1999/06/14 03:02:07 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      * Length field should match the number of bytes read
  60      */
  61     if (len != header.length) {
  62         debug(12, 3) ("icpHandleIcpV3: ICP message is too small\n");
  63         return;
  64     }
  65     switch (header.opcode) {
  66     case ICP_QUERY:
  67         /* We have a valid packet */
  68         url = buf + sizeof(icp_common_t) + sizeof(u_num32);
  69         if (strpbrk(url, w_space)) {
  70             url = rfc1738_escape(url);
  71             reply = icpCreateMessage(ICP_ERR, 0, url, header.reqnum, 0);
  72             icpUdpSend(fd, &from, reply, LOG_UDP_INVALID, 0);
  73             break;
  74         }
  75         if ((icp_request = urlParse(METHOD_GET, url)) == NULL) {
  76             reply = icpCreateMessage(ICP_ERR, 0, url, header.reqnum, 0);
  77             icpUdpSend(fd, &from, reply, LOG_UDP_INVALID, 0);
  78             break;
  79         }
  80         checklist.src_addr = from.sin_addr;
  81         checklist.my_addr = no_addr;
  82         checklist.request = icp_request;
  83         allow = aclCheckFast(Config.accessList.icp, &checklist);
  84         if (!allow) {
  85             debug(12, 2) ("icpHandleIcpV3: Access Denied for %s by %s.\n",
  86                 inet_ntoa(from.sin_addr), AclMatchedName);
  87             if (clientdbCutoffDenied(from.sin_addr)) {
  88                 /*
  89                  * count this DENIED query in the clientdb, even though
  90                  * we're not sending an ICP reply...
  91                  */
  92                 clientdbUpdate(from.sin_addr, LOG_UDP_DENIED, PROTO_ICP, 0);
  93             } else {
  94                 reply = icpCreateMessage(ICP_DENIED, 0, url, header.reqnum, 0);
  95                 icpUdpSend(fd, &from, reply, LOG_UDP_DENIED, 0);
  96             }
  97             break;
  98         }
  99         /* The peer is allowed to use this cache */
 100         entry = storeGetPublic(url, METHOD_GET);
 101         debug(12, 5) ("icpHandleIcpV3: OPCODE %s\n",
 102             icp_opcode_str[header.opcode]);
 103         if (icpCheckUdpHit(entry, icp_request)) {
 104             reply = icpCreateMessage(ICP_HIT, 0, url, header.reqnum, 0);
 105             icpUdpSend(fd, &from, reply, LOG_UDP_HIT, 0);
 106             break;
 107         }
 108         /* if store is rebuilding, return a UDP_HIT, but not a MISS */
 109         if (opt_reload_hit_only && store_dirs_rebuilding) {
 110             reply = icpCreateMessage(ICP_MISS_NOFETCH, 0, url, header.reqnum, 0);
 111             icpUdpSend(fd, &from, reply, LOG_UDP_MISS_NOFETCH, 0);
 112         } else if (hit_only_mode_until > squid_curtime) {
 113             reply = icpCreateMessage(ICP_MISS_NOFETCH, 0, url, header.reqnum, 0);
 114             icpUdpSend(fd, &from, reply, LOG_UDP_MISS_NOFETCH, 0);
 115         } else {
 116             reply = icpCreateMessage(ICP_MISS, 0, url, header.reqnum, 0);
 117             icpUdpSend(fd, &from, reply, LOG_UDP_MISS, 0);
 118         }
 119         break;
 120
 121     case ICP_HIT:
 122 #if ALLOW_SOURCE_PING
 123     case ICP_SECHO:
 124 #endif
 125     case ICP_DECHO:
 126     case ICP_MISS:
 127     case ICP_DENIED:
 128     case ICP_MISS_NOFETCH:
 129         if (neighbors_do_private_keys && header.reqnum == 0) {
 130             debug(12, 0) ("icpHandleIcpV3: Neighbor %s returned reqnum = 0\n",
 131                 inet_ntoa(from.sin_addr));
 132             debug(12, 0) ("icpHandleIcpV3: Disabling use of private keys\n");
 133             neighbors_do_private_keys = 0;
 134         }
 135         url = buf + sizeof(icp_common_t);
 136         debug(12, 3) ("icpHandleIcpV3: %s from %s for '%s'\n",
 137             icp_opcode_str[header.opcode],
 138             inet_ntoa(from.sin_addr),
 139             url);
 140         key = icpGetCacheKey(url, (int) header.reqnum);
 141         /* call neighborsUdpAck even if ping_status != PING_WAITING */
 142         neighborsUdpAck(key, &header, &from);
 143         break;
 144
 145     case ICP_INVALID:
 146     case ICP_ERR:
 147         break;
 148
 149     default:
 150         debug(12, 0) ("icpHandleIcpV3: UNKNOWN OPCODE: %d from %s\n",
 151             header.opcode, inet_ntoa(from.sin_addr));
 152         break;
 153     }
 154     if (icp_request)
 155         requestDestroy(icp_request);
 156 }