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// Copyright (C) 2016-2021 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
#include <config.h>
#include <dhcp4/parser_context.h>
#include <dhcp4/dhcp4_parser.h>
#include <dhcp4/dhcp4_log.h>
#include <exceptions/exceptions.h>
#include <cc/data.h>
#include <boost/lexical_cast.hpp>
#include <fstream>
#include <sstream>
#include <limits>
namespace isc {
namespace dhcp {
Parser4Context::Parser4Context()
: sfile_(nullptr), ctx_(NO_KEYWORD), trace_scanning_(false),
trace_parsing_(false) {
}
Parser4Context::~Parser4Context() {
}
isc::data::ElementPtr
Parser4Context::parseString(const std::string& str, ParserType parser_type) {
scanStringBegin(str, parser_type);
return (parseCommon());
}
isc::data::ElementPtr
Parser4Context::parseFile(const std::string& filename, ParserType parser_type) {
FILE* f = fopen(filename.c_str(), "r");
if (!f) {
isc_throw(Dhcp4ParseError, "Unable to open file " << filename);
}
scanFileBegin(f, filename, parser_type);
return (parseCommon());
}
isc::data::ElementPtr
Parser4Context::parseCommon() {
isc::dhcp::Dhcp4Parser parser(*this);
// Uncomment this to get detailed parser logs.
// trace_parsing_ = true;
parser.set_debug_level(trace_parsing_);
try {
int res = parser.parse();
if (res != 0) {
isc_throw(Dhcp4ParseError, "Parser abort");
}
scanEnd();
}
catch (...) {
scanEnd();
throw;
}
if (stack_.size() == 1) {
return (stack_[0]);
} else {
isc_throw(Dhcp4ParseError, "Expected exactly one terminal Element expected, found "
<< stack_.size());
}
}
void
Parser4Context::error(const isc::dhcp::location& loc,
const std::string& what,
size_t pos) {
if (pos == 0) {
isc_throw(Dhcp4ParseError, loc << ": " << what);
} else {
isc_throw(Dhcp4ParseError, loc << " (near " << pos << "): " << what);
}
}
void
Parser4Context::error(const std::string& what) {
isc_throw(Dhcp4ParseError, what);
}
void
Parser4Context::fatal(const std::string& what) {
isc_throw(Dhcp4ParseError, what);
}
isc::data::Element::Position
Parser4Context::loc2pos(isc::dhcp::location& loc) {
const std::string& file = *loc.begin.filename;
const uint32_t line = loc.begin.line;
const uint32_t pos = loc.begin.column;
return (isc::data::Element::Position(file, line, pos));
}
void
Parser4Context::require(const std::string& name,
isc::data::Element::Position open_loc,
isc::data::Element::Position close_loc) {
ConstElementPtr value = stack_.back()->get(name);
if (!value) {
isc_throw(Dhcp4ParseError,
"missing parameter '" << name << "' ("
<< stack_.back()->getPosition() << ") ["
<< contextName() << " map between "
<< open_loc << " and " << close_loc << "]");
}
}
void
Parser4Context::unique(const std::string& name,
isc::data::Element::Position loc) {
ConstElementPtr value = stack_.back()->get(name);
if (value) {
if (ctx_ != NO_KEYWORD) {
isc_throw(Dhcp4ParseError, loc << ": duplicate " << name
<< " entries in " << contextName()
<< " map (previous at " << value->getPosition() << ")");
} else {
isc_throw(Dhcp4ParseError, loc << ": duplicate " << name
<< " entries in JSON"
<< " map (previous at " << value->getPosition() << ")");
}
}
}
void
Parser4Context::enter(const ParserContext& ctx) {
cstack_.push_back(ctx_);
ctx_ = ctx;
}
void
Parser4Context::leave() {
#if 1
if (cstack_.empty()) {
fatal("unbalanced syntactic context");
}
#endif
ctx_ = cstack_.back();
cstack_.pop_back();
}
const std::string
Parser4Context::contextName() {
switch (ctx_) {
case NO_KEYWORD:
return ("__no keyword__");
case CONFIG:
return ("toplevel");
case DHCP4:
return ("Dhcp4");
case INTERFACES_CONFIG:
return ("interfaces-config");
case DHCP_SOCKET_TYPE:
return ("dhcp-socket-type");
case OUTBOUND_INTERFACE:
return ("outbound-interface");
case LEASE_DATABASE:
return ("lease-database");
case HOSTS_DATABASE:
return ("hosts-database");
case DATABASE_TYPE:
return ("database-type");
case DATABASE_ON_FAIL:
return ("database-on-fail");
case HOST_RESERVATION_IDENTIFIERS:
return ("host-reservation-identifiers");
case HOOKS_LIBRARIES:
return ("hooks-libraries");
case SUBNET4:
return ("subnet4");
case RESERVATION_MODE:
return ("reservation-mode");
case OPTION_DEF:
return ("option-def");
case OPTION_DATA:
return ("option-data");
case CLIENT_CLASSES:
return ("client-classes");
case EXPIRED_LEASES_PROCESSING:
return ("expired-leases-processing");
case SERVER_ID:
return ("server-id");
case CONTROL_SOCKET:
return ("control-socket");
case DHCP_QUEUE_CONTROL:
return ("dhcp-queue-control");
case DHCP_MULTI_THREADING:
return ("multi-threading");
case POOLS:
return ("pools");
case RESERVATIONS:
return ("reservations");
case RELAY:
return ("relay");
case LOGGERS:
return ("loggers");
case OUTPUT_OPTIONS:
return ("output-options");
case DHCP_DDNS:
return ("dhcp-ddns");
case NCR_PROTOCOL:
return ("ncr-protocol");
case NCR_FORMAT:
return ("ncr-format");
case REPLACE_CLIENT_NAME:
return ("replace-client-name");
case SHARED_NETWORK:
return ("shared-networks");
case SANITY_CHECKS:
return ("sanity-checks");
case CONFIG_CONTROL:
return ("config-control");
case CONFIG_DATABASE:
return ("config-database");
case COMPATIBILITY:
return ("compatibility");
default:
return ("__unknown__");
}
}
void
Parser4Context::warning(const isc::dhcp::location& loc,
const std::string& what) {
std::ostringstream msg;
msg << loc << ": " << what;
LOG_WARN(dhcp4_logger, DHCP4_CONFIG_SYNTAX_WARNING)
.arg(msg.str());
}
void
Parser4Context::warnAboutExtraCommas(const isc::dhcp::location& loc) {
warning(loc, "Extraneous comma. A piece of configuration may have been omitted.");
}
} // namespace dhcp
} // namespace isc
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