HttpHeaderData.cc

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/*
 * Copyright (C) 1996-2023 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 28    Access Control */
 
#include "squid.h"
#include "acl/Acl.h"
#include "acl/Checklist.h"
#include "acl/HttpHeaderData.h"
#include "acl/RegexData.h"
#include "base/RegexPattern.h"
#include "cache_cf.h"
#include "ConfigParser.h"
#include "debug/Stream.h"
#include "HttpHeaderTools.h"
#include "sbuf/SBuf.h"
#include "sbuf/StringConvert.h"
 
/* Construct an ACLHTTPHeaderData that uses an ACLRegex rule with the value of the
 * selected header from a given request.
 *
 * TODO: This can be generalised by making the type of the regex_rule into a
 * template parameter - so that we can use different rules types in future.
 */
ACLHTTPHeaderData::ACLHTTPHeaderData() : hdrId(Http::HdrType::BAD_HDR), regex_rule(new ACLRegexData)
{}
 
ACLHTTPHeaderData::~ACLHTTPHeaderData()
{
    delete regex_rule;
}
 
bool
ACLHTTPHeaderData::match(HttpHeader* hdr)
{
    if (hdr == nullptr)
        return false;
 
    debugs(28, 3, "aclHeaderData::match: checking '" << hdrName << "'");
 
    String value;
    if (hdrId != Http::HdrType::BAD_HDR) {
        if (!hdr->has(hdrId))
            return false;
        value = hdr->getStrOrList(hdrId);
    } else {
        if (!hdr->hasNamed(hdrName, &value))
            return false;
    }
 
    auto cvalue = StringToSBuf(value);
    return regex_rule->match(cvalue.c_str());
}
 
SBufList
ACLHTTPHeaderData::dump() const
{
    SBufList sl;
    sl.push_back(SBuf(hdrName));
    sl.splice(sl.end(), regex_rule->dump());
    return sl;
}
 
const Acl::Options &
ACLHTTPHeaderData::lineOptions()
{
    return regex_rule->lineOptions();
}
 
void
ACLHTTPHeaderData::parse()
{
    Acl::SetKey(hdrName, "header-name", ConfigParser::strtokFile());
    hdrId = Http::HeaderLookupTable.lookup(hdrName).id;
    regex_rule->parse();
}
 
bool
ACLHTTPHeaderData::empty() const
{
    return (hdrId == Http::HdrType::BAD_HDR && hdrName.isEmpty()) || regex_rule->empty();
}