dhcp6_lexer.ll 11.5 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14
/* Copyright (C) 2015-2016 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/. */

%{ /* -*- C++ -*- */
#include <cerrno>
#include <climits>
#include <cstdlib>
#include <string>
#include <dhcp6/parser_context.h>
#include <asiolink/io_address.h>
#include <boost/lexical_cast.hpp>
Tomek Mrugalski's avatar
Tomek Mrugalski committed
15
#include <exceptions/exceptions.h>
16 17 18 19 20 21 22 23 24 25 26 27

// Work around an incompatibility in flex (at least versions
// 2.5.31 through 2.5.33): it generates code that does
// not conform to C89.  See Debian bug 333231
// <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=333231>.
# undef yywrap
# define yywrap() 1

// The location of the current token. The lexer will keep updating it. This
// variable will be useful for logging errors.
static isc::dhcp::location loc;

28 29 30 31
static bool start_token_flag = false;

static isc::dhcp::Parser6Context::ParserType start_token_value;

32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62
// To avoid the call to exit... oops!
#define YY_FATAL_ERROR(msg) isc::dhcp::Parser6Context::fatal(msg)
%}

/* noyywrap disables automatic rewinding for the next file to parse. Since we
   always parse only a single string, there's no need to do any wraps. And
   using yywrap requires linking with -lfl, which provides the default yywrap
   implementation that always returns 1 anyway. */
%option noyywrap

/* nounput simplifies the lexer, by removing support for putting a character
   back into the input stream. We never use such capability anyway. */
%option nounput

/* batch means that we'll never use the generated lexer interactively. */
%option batch

/* Enables debug mode. To see the debug messages, one needs to also set
   yy_flex_debug to 1, then the debug messages will be printed on stderr. */
%option debug

/* I have no idea what this option does, except it was specified in the bison
   examples and Postgres folks added it to remove gcc 4.3 warnings. Let's
   be on the safe side and keep it. */
%option noinput

/* This line tells flex to track the line numbers. It's not really that
   useful for client classes, which typically are one-liners, but it may be
   useful in more complex cases. */
%option yylineno

Tomek Mrugalski's avatar
Tomek Mrugalski committed
63 64
%x COMMENT

65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87
/* These are not token expressions yet, just convenience expressions that
   can be used during actual token definitions. Note some can match
   incorrect inputs (e.g., IP addresses) which must be checked. */
int   \-?[0-9]+
blank [ \t]

UnicodeEscapeSequence                   u[0-9A-Fa-f]{4}
JSONEscapeCharacter                     ["\\/bfnrt]
JSONEscapeSequence                      {JSONEscapeCharacter}|{UnicodeEscapeSequence}
JSONStringCharacter                     [^"\\]|\\{JSONEscapeSequence}
JSONString                              \"{JSONStringCharacter}*\"


%{
// This code run each time a pattern is matched. It updates the location
// by moving it ahead by yyleng bytes. yyleng specifies the length of the
// currently matched token.
#define YY_USER_ACTION  loc.columns(yyleng);
%}

%%

%{
88 89 90 91
    // This part of the code is copied over to the verbatim to the top
    // of the generated yylex function. Explanation:
    // http://www.gnu.org/software/bison/manual/html_node/Multiple-start_002dsymbols.html

92 93
    // Code run each time yylex is called.
    loc.step();
Tomek Mrugalski's avatar
Tomek Mrugalski committed
94 95

    int comment_start_line = 0;
96 97 98 99 100 101 102

    if (start_token_flag) {
        start_token_flag = false;
        switch (start_token_value) {
        case Parser6Context::PARSER_DHCP6:
            return isc::dhcp::Dhcp6Parser::make_TOPLEVEL_DHCP6(loc);
        case Parser6Context::PARSER_GENERIC_JSON:
103
        default:
104 105 106
            return isc::dhcp::Dhcp6Parser::make_TOPLEVEL_GENERIC_JSON(loc);
        }
    }
107 108
%}

Tomek Mrugalski's avatar
Tomek Mrugalski committed
109 110 111 112 113 114 115 116 117 118 119 120 121 122 123
#.* ;

"//"(.*) ;

"/*" {
  BEGIN(COMMENT);
  comment_start_line = yylineno;
}

<COMMENT>"*/" BEGIN(INITIAL);
<COMMENT>.|"\n" ;
<COMMENT><<EOF>> {
    isc_throw(isc::BadValue, "Comment not closed. (/* in line " << comment_start_line);
}

124 125 126 127 128 129 130 131 132 133
{blank}+   {
    // Ok, we found a with space. Let's ignore it and update loc variable.
    loc.step();
}
[\n]+      {
    // Newline found. Let's update the location and continue.
    loc.lines(yyleng);
    loc.step();
}

134 135 136
\"Dhcp6\"  { return isc::dhcp::Dhcp6Parser::make_DHCP6(loc); }
\"interfaces-config\" { return  isc::dhcp::Dhcp6Parser::make_INTERFACES_CONFIG(loc); }
\"interfaces\" { return  isc::dhcp::Dhcp6Parser::make_INTERFACES(loc); }
137

138
\"lease-database\" { return  isc::dhcp::Dhcp6Parser::make_LEASE_DATABASE(loc); }
139 140 141 142 143 144
\"hosts-database\" { return  isc::dhcp::Dhcp6Parser::make_HOSTS_DATABASE(loc); }
\"type\" { return isc::dhcp::Dhcp6Parser::make_TYPE(loc); }
\"user\" { return isc::dhcp::Dhcp6Parser::make_USER(loc); }
\"password\" { return isc::dhcp::Dhcp6Parser::make_PASSWORD(loc); }
\"host\" { return isc::dhcp::Dhcp6Parser::make_HOST(loc); }

145 146 147 148 149 150 151 152 153
\"preferred-lifetime\" { return  isc::dhcp::Dhcp6Parser::make_PREFERRED_LIFETIME(loc); }
\"valid-lifetime\" { return  isc::dhcp::Dhcp6Parser::make_VALID_LIFETIME(loc); }
\"renew-timer\" { return  isc::dhcp::Dhcp6Parser::make_RENEW_TIMER(loc); }
\"rebind-timer\" { return  isc::dhcp::Dhcp6Parser::make_REBIND_TIMER(loc); }
\"subnet6\" { return  isc::dhcp::Dhcp6Parser::make_SUBNET6(loc); }
\"option-data\" { return  isc::dhcp::Dhcp6Parser::make_OPTION_DATA(loc); }
\"name\" { return  isc::dhcp::Dhcp6Parser::make_NAME(loc); }
\"data\" { return  isc::dhcp::Dhcp6Parser::make_DATA(loc); }
\"pools\" { return  isc::dhcp::Dhcp6Parser::make_POOLS(loc); }
154 155 156 157 158 159

\"pd-pools\" { return  isc::dhcp::Dhcp6Parser::make_PD_POOLS(loc); }
\"prefix\" { return  isc::dhcp::Dhcp6Parser::make_PREFIX(loc); }
\"prefix-len\" { return  isc::dhcp::Dhcp6Parser::make_PREFIX_LEN(loc); }
\"delegated-len\" { return  isc::dhcp::Dhcp6Parser::make_DELEGATED_LEN(loc); }

160 161 162
\"pool\" { return  isc::dhcp::Dhcp6Parser::make_POOL(loc); }
\"subnet\" { return  isc::dhcp::Dhcp6Parser::make_SUBNET(loc); }
\"interface\" { return  isc::dhcp::Dhcp6Parser::make_INTERFACE(loc); }
163 164
\"id\" { return  isc::dhcp::Dhcp6Parser::make_ID(loc); }

165
\"code\" { return isc::dhcp::Dhcp6Parser::make_CODE(loc); }
166 167
\"mac-sources\" { return isc::dhcp::Dhcp6Parser::make_MAC_SOURCES(loc); }
\"relay-supplied-options\" { return isc::dhcp::Dhcp6Parser::make_RELAY_SUPPLIED_OPTIONS(loc); }
168
\"host-reservation-identifiers\" { return isc::dhcp::Dhcp6Parser::make_HOST_RESERVATION_IDENTIFIERS(loc); }
169 170 171 172

\"Logging\" { return isc::dhcp::Dhcp6Parser::make_LOGGING(loc); }
\"loggers\" { return isc::dhcp::Dhcp6Parser::make_LOGGERS(loc); }
\"output_options\" { return isc::dhcp::Dhcp6Parser::make_OUTPUT_OPTIONS(loc); }
173
\"output\" { return isc::dhcp::Dhcp6Parser::make_OUTPUT(loc); }
174 175
\"debuglevel\" { return isc::dhcp::Dhcp6Parser::make_DEBUGLEVEL(loc); }
\"severity\" { return isc::dhcp::Dhcp6Parser::make_SEVERITY(loc); }
176

177 178 179 180 181
\"client-classes\" { return isc::dhcp::Dhcp6Parser::make_CLIENT_CLASSES(loc); }
\"client-class\" { return isc::dhcp::Dhcp6Parser::make_CLIENT_CLASS(loc); }
\"test\" { return isc::dhcp::Dhcp6Parser::make_TEST(loc); }

\"reservations\" { return isc::dhcp::Dhcp6Parser::make_RESERVATIONS(loc); }
182 183
\"ip-addresses\" { return isc::dhcp::Dhcp6Parser::make_IP_ADDRESSES(loc); }
\"prefixes\" { return isc::dhcp::Dhcp6Parser::make_PREFIXES(loc); }
184
\"duid\" { return isc::dhcp::Dhcp6Parser::make_DUID(loc); }
185 186 187
\"hw-address\" { return isc::dhcp::Dhcp6Parser::make_HW_ADDRESS(loc); }
\"hostname\" { return isc::dhcp::Dhcp6Parser::make_HOSTNAME(loc); }
\"space\" { return isc::dhcp::Dhcp6Parser::make_SPACE(loc); }
188
\"csv-format\" { return isc::dhcp::Dhcp6Parser::make_CSV_FORMAT(loc); }
189

190 191 192 193 194 195 196 197 198 199
\"hooks-libraries\" { return isc::dhcp::Dhcp6Parser::make_HOOKS_LIBRARIES(loc); }
\"library\" { return isc::dhcp::Dhcp6Parser::make_LIBRARY(loc); }

\"server-id\" { return isc::dhcp::Dhcp6Parser::make_SERVER_ID(loc); }
\"identifier\" { return isc::dhcp::Dhcp6Parser::make_IDENTIFIER(loc); }
\"htype\" { return isc::dhcp::Dhcp6Parser::make_HTYPE(loc); }
\"time\" { return isc::dhcp::Dhcp6Parser::make_TIME(loc); }

\"expired-leases-processing\" { return isc::dhcp::Dhcp6Parser::make_EXPIRED_LEASES_PROCESSING(loc); }

200
\"dhcp4o6-port\" { return isc::dhcp::Dhcp6Parser::make_DHCP4O6_PORT(loc); }
201

202 203 204 205 206 207 208 209 210 211
{JSONString} {
    // A string has been matched. It contains the actual string and single quotes.
    // We need to get those quotes out of the way and just use its content, e.g.
    // for 'foo' we should get foo
    std::string tmp(yytext+1);
    tmp.resize(tmp.size() - 1);

    return isc::dhcp::Dhcp6Parser::make_STRING(tmp, loc);
}

212 213 214 215 216 217
"["                  { return isc::dhcp::Dhcp6Parser::make_LSQUARE_BRACKET(loc); }
"]"                 { return isc::dhcp::Dhcp6Parser::make_RSQUARE_BRACKET(loc); }
"{"                  { return isc::dhcp::Dhcp6Parser::make_LCURLY_BRACKET(loc); }
"}"                     { return isc::dhcp::Dhcp6Parser::make_RCURLY_BRACKET(loc); }
","                   { return isc::dhcp::Dhcp6Parser::make_COMMA(loc); }
":"                     { return isc::dhcp::Dhcp6Parser::make_COLON(loc); }
218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268

{int} {
    // An integer was found.
    std::string tmp(yytext);
    int64_t integer = 0;
    try {
        // In substring we want to use negative values (e.g. -1).
        // In enterprise-id we need to use values up to 0xffffffff.
        // To cover both of those use cases, we need at least
        // int64_t.
        integer = boost::lexical_cast<int64_t>(tmp);
    } catch (const boost::bad_lexical_cast &) {
        driver.error(loc, "Failed to convert " + tmp + " to an integer.");
    }

    // The parser needs the string form as double conversion is no lossless
    return isc::dhcp::Dhcp6Parser::make_INTEGER(integer, loc);
}
[-+]?[0-9]*\.?[0-9]*([eE][-+]?[0-9]+)? {
    // A floating point was found.
    std::string tmp(yytext);
    double fp = 0.0;
    try {
        // In substring we want to use negative values (e.g. -1).
        // In enterprise-id we need to use values up to 0xffffffff.
        // To cover both of those use cases, we need at least
        // int64_t.
        fp = boost::lexical_cast<double>(tmp);
    } catch (const boost::bad_lexical_cast &) {
        driver.error(loc, "Failed to convert " + tmp + " to a floating point.");
    }

    return isc::dhcp::Dhcp6Parser::make_FLOAT(fp, loc);
}

true|false {
    string tmp(yytext);
    return isc::dhcp::Dhcp6Parser::make_BOOLEAN(tmp == "true", loc);
}

null {
   return isc::dhcp::Dhcp6Parser::make_NULL_TYPE(loc);
}

.          driver.error (loc, "Invalid character: " + std::string(yytext));
<<EOF>>    return isc::dhcp::Dhcp6Parser::make_END(loc);
%%

using namespace isc::dhcp;

void
269
Parser6Context::scanStringBegin(ParserType parser_type)
270
{
271 272 273
    start_token_flag = true;
    start_token_value = parser_type;

274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289
    loc.initialize(&file_);
    yy_flex_debug = trace_scanning_;
    YY_BUFFER_STATE buffer;
    buffer = yy_scan_bytes(string_.c_str(), string_.size());
    if (!buffer) {
        fatal("cannot scan string");
        // fatal() throws an exception so this can't be reached
    }
}

void
Parser6Context::scanStringEnd()
{
    yy_delete_buffer(YY_CURRENT_BUFFER);
}

290
void
291 292 293 294 295
Parser6Context::scanFileBegin(FILE * f, ParserType parser_type) {

    start_token_flag = true;
    start_token_value = parser_type;

296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312
    loc.initialize(&file_);
    yy_flex_debug = trace_scanning_;
    YY_BUFFER_STATE buffer;

    // See dhcp6_lexer.cc header for available definitions
    buffer = parser6__create_buffer(f, 65536 /*buffer size*/);
    if (!buffer) {
        fatal("cannot scan file " + file_);
    }
}

void
Parser6Context::scanFileEnd(FILE * f) {
    fclose(f);
    yy_delete_buffer(YY_CURRENT_BUFFER);
}

313 314 315 316 317 318 319
namespace {
/// To avoid unused function error
class Dummy {
    // cppcheck-suppress unusedPrivateFunction
    void dummy() { yy_fatal_error("Fix me: how to disable its definition?"); }
};
}