icp_v3.cc

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/*
 * Copyright (C) 1996-2025 The Squid Software Foundation and contributors
 *
 * Squid software is distributed under GPLv2+ license and includes
 * contributions from numerous individuals and organizations.
 * Please see the COPYING and CONTRIBUTORS files for details.
 */
 
/* DEBUG: section 12    Internet Cache Protocol (ICP) */
 
#include "squid.h"
#include "acl/FilledChecklist.h"
#include "HttpRequest.h"
#include "ICP.h"
#include "Store.h"
 
class ICP3State: public ICPState
{
 
public:
    ICP3State(icp_common_t &aHeader, HttpRequest *aRequest) :
        ICPState(aHeader, aRequest) {}
 
    ~ICP3State() override = default;
};
 
static void
doV3Query(int fd, Ip::Address &from, char *buf, icp_common_t header)
{
    /* We have a valid packet */
    char *url = buf + sizeof(icp_common_t) + sizeof(uint32_t);
    HttpRequest *icp_request = icpGetRequest(url, header.reqnum, fd, from);
 
    if (!icp_request)
        return;
 
    if (!icpAccessAllowed(from, icp_request)) {
        icpDenyAccess (from, url, header.reqnum, fd);
        delete icp_request;
        return;
    }
 
    /* The peer is allowed to use this cache */
    ICP3State state(header, icp_request);
    state.fd = fd;
    state.from = from;
    state.url = xstrdup(url);
 
    icp_opcode codeToSend;
 
    if (state.isHit()) {
        codeToSend = ICP_HIT;
    } else if (icpGetCommonOpcode() == ICP_ERR)
        codeToSend = ICP_MISS;
    else
        codeToSend = icpGetCommonOpcode();
 
    icpCreateAndSend(codeToSend, 0, url, header.reqnum, 0, fd, from, state.al);
}
 
/* Currently Harvest cached-2.x uses ICP_VERSION_3 */
void
icpHandleIcpV3(int fd, Ip::Address &from, char *buf, int len)
{
    if (len <= 0) {
        debugs(12, 3, "icpHandleIcpV3: ICP message is too small");
        return;
    }
 
    icp_common_t header (buf, len);
    /*
     * Length field should match the number of bytes read
     */
 
    if (len != header.length) {
        debugs(12, 3, "icpHandleIcpV3: ICP message is too small");
        return;
    }
 
    debugs(12, 5, "OPCODE " << icp_opcode_str[header.getOpCode()] << '=' << uint8_t(header.opcode));
 
    switch (header.opcode) {
 
    case ICP_QUERY:
        doV3Query(fd, from, buf, header);
        break;
 
    case ICP_HIT:
 
    case ICP_DECHO:
 
    case ICP_MISS:
 
    case ICP_DENIED:
 
    case ICP_MISS_NOFETCH:
        header.handleReply(buf, from);
        break;
 
    case ICP_INVALID:
 
    case ICP_ERR:
        break;
 
    default:
        debugs(12, DBG_CRITICAL, "ERROR: icpHandleIcpV3: Unknown opcode: " << header.opcode << " from " << from);
        break;
    }
}