mirror of
https://gitlab.nic.cz/labs/bird.git
synced 2024-11-13 22:58:42 +00:00
35f88b305a
Add support for specifying a password in hexadecimal format, The result is the same whether a password is specified as a quoted string or a hex-encoded byte string, this just makes it more convenient to input high-entropy byte strings as MAC keys.
862 lines
19 KiB
Plaintext
862 lines
19 KiB
Plaintext
/*
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* BIRD -- Configuration Lexer
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*
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* (c) 1998--2000 Martin Mares <mj@ucw.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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/**
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* DOC: Lexical analyzer
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*
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* The lexical analyzer used for configuration files and CLI commands
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* is generated using the |flex| tool accompanied by a couple of
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* functions maintaining the hash tables containing information about
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* symbols and keywords.
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*
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* Each symbol is represented by a &symbol structure containing name
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* of the symbol, its lexical scope, symbol class (%SYM_PROTO for a
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* name of a protocol, %SYM_CONSTANT for a constant etc.) and class
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* dependent data. When an unknown symbol is encountered, it's
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* automatically added to the symbol table with class %SYM_VOID.
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*
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* The keyword tables are generated from the grammar templates
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* using the |gen_keywords.m4| script.
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*/
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%{
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#undef REJECT /* Avoid name clashes */
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#include <errno.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <libgen.h>
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#include <glob.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#define PARSER 1
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#include "nest/bird.h"
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#include "nest/route.h"
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#include "nest/protocol.h"
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#include "filter/filter.h"
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#include "filter/f-inst.h"
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#include "conf/conf.h"
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#include "conf/cf-parse.tab.h"
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#include "lib/string.h"
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#include "lib/hash.h"
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struct keyword {
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byte *name;
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int value;
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struct keyword *next;
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};
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#include "conf/keywords.h"
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/* Could be defined by Bison in cf-parse.tab.h, inteferes with SYM hash */
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#ifdef SYM
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#undef SYM
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#endif
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static uint cf_hash(const byte *c);
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#define KW_KEY(n) n->name
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#define KW_NEXT(n) n->next
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#define KW_EQ(a,b) !strcmp(a,b)
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#define KW_FN(k) cf_hash(k)
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#define KW_ORDER 8 /* Fixed */
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#define SYM_KEY(n) n->name, n->scope->active
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#define SYM_NEXT(n) n->next
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#define SYM_EQ(a,s1,b,s2) !strcmp(a,b) && s1 == s2
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#define SYM_FN(k,s) cf_hash(k)
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#define SYM_ORDER 6 /* Initial */
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#define SYM_REHASH sym_rehash
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#define SYM_PARAMS /8, *1, 2, 2, 6, 20
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HASH_DEFINE_REHASH_FN(SYM, struct symbol)
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HASH(struct keyword) kw_hash;
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struct sym_scope *conf_this_scope;
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linpool *cfg_mem;
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int (*cf_read_hook)(byte *buf, unsigned int max, int fd);
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struct include_file_stack *ifs;
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static struct include_file_stack *ifs_head;
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#define QUOTED_BUFFER_SIZE 4096
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static BUFFER_(char) quoted_buffer;
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static char quoted_buffer_data[QUOTED_BUFFER_SIZE];
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static inline void quoted_buffer_init(void) {
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quoted_buffer.used = 0;
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quoted_buffer.size = QUOTED_BUFFER_SIZE;
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quoted_buffer.data = quoted_buffer_data;
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}
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#define MAX_INCLUDE_DEPTH 8
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#define YY_INPUT(buf,result,max) result = cf_read_hook(buf, max, ifs->fd);
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#define YY_NO_UNPUT
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#define YY_FATAL_ERROR(msg) cf_error(msg)
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#define YY_USER_ACTION ifs->chno += yyleng; ifs->toklen = yyleng;
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static void cf_include(char *arg, int alen);
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static int check_eof(void);
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static enum yytokentype cf_lex_symbol(const char *data);
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%}
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%option noyywrap
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%option noinput
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%option nounput
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%option noreject
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%x COMMENT CCOMM CLI QUOTED APOSTROPHED INCLUDE
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ALPHA [a-zA-Z_]
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DIGIT [0-9]
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XIGIT [0-9a-fA-F]
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ALNUM [a-zA-Z_0-9]
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WHITE [ \t]
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%%
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^{WHITE}*include{WHITE}*\" {
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if (!ifs->depth)
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cf_error("Include not allowed in CLI");
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BEGIN(INCLUDE);
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}
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<INCLUDE>[^"\n]+["]{WHITE}*; {
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char *start, *end;
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start = yytext;
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end = strchr(start, '"');
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*end = 0;
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if (start == end)
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cf_error("Include with empty argument");
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cf_include(start, end-start);
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BEGIN(INITIAL);
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}
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<INCLUDE>["] cf_error("Include with empty argument");
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<INCLUDE>. cf_error("Unterminated include");
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<INCLUDE>\n cf_error("Unterminated include");
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<INCLUDE><<EOF>> cf_error("Unterminated include");
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{DIGIT}+:{DIGIT}+ {
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uint len1 UNUSED, len2;
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u64 l;
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char *e;
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errno = 0;
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l = bstrtoul10(yytext, &e);
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if (!e || (*e != ':') || (errno == ERANGE) || (l >> 32))
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cf_error("ASN out of range");
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if (l >> 16)
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{
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len1 = 32;
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len2 = 16;
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cf_lval.i64 = (2ULL << 48) | (((u64) l) << len2);
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}
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else
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{
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len1 = 16;
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len2 = 32;
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cf_lval.i64 = 0 | (((u64) l) << len2);
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}
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errno = 0;
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l = bstrtoul10(e+1, &e);
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if (!e || *e || (errno == ERANGE) || (l >> len2))
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cf_error("Number out of range");
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cf_lval.i64 |= l;
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return VPN_RD;
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}
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[02]:{DIGIT}+:{DIGIT}+ {
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uint len1, len2;
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u64 l;
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char *e;
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if (yytext[0] == '0')
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{
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cf_lval.i64 = 0;
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len1 = 16;
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len2 = 32;
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}
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else
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{
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cf_lval.i64 = 2ULL << 48;
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len1 = 32;
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len2 = 16;
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}
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errno = 0;
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l = bstrtoul10(yytext+2, &e);
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if (!e || (*e != ':') || (errno == ERANGE) || (l >> len1))
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cf_error("ASN out of range");
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cf_lval.i64 |= ((u64) l) << len2;
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errno = 0;
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l = bstrtoul10(e+1, &e);
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if (!e || *e || (errno == ERANGE) || (l >> len2))
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cf_error("Number out of range");
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cf_lval.i64 |= l;
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return VPN_RD;
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}
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{DIGIT}+\.{DIGIT}+\.{DIGIT}+\.{DIGIT}+:{DIGIT}+ {
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unsigned long int l;
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ip4_addr ip4;
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char *e;
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cf_lval.i64 = 1ULL << 48;
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e = strchr(yytext, ':');
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*e++ = '\0';
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if (!ip4_pton(yytext, &ip4))
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cf_error("Invalid IPv4 address %s in Route Distinguisher", yytext);
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cf_lval.i64 |= ((u64) ip4_to_u32(ip4)) << 16;
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errno = 0;
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l = bstrtoul10(e, &e);
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if (!e || *e || (errno == ERANGE) || (l >> 16))
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cf_error("Number out of range");
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cf_lval.i64 |= l;
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return VPN_RD;
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}
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{DIGIT}+\.{DIGIT}+\.{DIGIT}+\.{DIGIT}+ {
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if (!ip4_pton(yytext, &cf_lval.ip4))
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cf_error("Invalid IPv4 address %s", yytext);
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return IP4;
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}
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{XIGIT}{2}(:{XIGIT}{2}|{XIGIT}{2}){15,} {
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char *s = yytext;
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size_t len = 0, i;
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struct bytestring *bytes;
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byte *b;
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while (*s) {
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len++;
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s += 2;
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if (*s == ':')
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s++;
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}
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bytes = cfg_allocz(sizeof(*bytes) + len);
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bytes->length = len;
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b = &bytes->data[0];
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s = yytext;
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errno = 0;
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for (i = 0; i < len; i++) {
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*b = bstrtobyte16(s);
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if (errno == ERANGE)
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cf_error("Invalid hex string");
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b++;
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s += 2;
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if (*s == ':')
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s++;
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}
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cf_lval.bs = bytes;
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return BYTESTRING;
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}
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({XIGIT}*::|({XIGIT}*:){3,})({XIGIT}*|{DIGIT}+\.{DIGIT}+\.{DIGIT}+\.{DIGIT}+) {
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if (!ip6_pton(yytext, &cf_lval.ip6))
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cf_error("Invalid IPv6 address %s", yytext);
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return IP6;
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}
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0x{XIGIT}+ {
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char *e;
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unsigned long int l;
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errno = 0;
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l = bstrtoul16(yytext+2, &e);
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if (!e || *e || errno == ERANGE || (unsigned long int)(unsigned int) l != l)
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cf_error("Number out of range");
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cf_lval.i = l;
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return NUM;
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}
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{DIGIT}+ {
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char *e;
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unsigned long int l;
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errno = 0;
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l = bstrtoul10(yytext, &e);
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if (!e || *e || errno == ERANGE || (unsigned long int)(unsigned int) l != l)
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cf_error("Number out of range");
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cf_lval.i = l;
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return NUM;
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}
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else: {
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/* Hack to distinguish if..else from else: in case */
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return ELSECOL;
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}
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['] {
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BEGIN(APOSTROPHED);
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quoted_buffer_init();
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}
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<APOSTROPHED>{ALNUM}|[-]|[.:] BUFFER_PUSH(quoted_buffer) = yytext[0];
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<APOSTROPHED>\n cf_error("Unterminated symbol");
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<APOSTROPHED><<EOF>> cf_error("Unterminated symbol");
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<APOSTROPHED>['] {
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BEGIN(INITIAL);
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BUFFER_PUSH(quoted_buffer) = 0;
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return cf_lex_symbol(quoted_buffer_data);
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}
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<APOSTROPHED>. cf_error("Invalid character in apostrophed symbol");
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({ALPHA}{ALNUM}*) {
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return cf_lex_symbol(yytext);
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}
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<CLI>(.|\n) {
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BEGIN(INITIAL);
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return CLI_MARKER;
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}
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\.\. {
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return DDOT;
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}
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[={}:;,.()+*/%<>~\[\]?!\|-] {
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return yytext[0];
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}
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["] {
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BEGIN(QUOTED);
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quoted_buffer_init();
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}
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<QUOTED>\n cf_error("Unterminated string");
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<QUOTED><<EOF>> cf_error("Unterminated string");
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<QUOTED>["] {
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BEGIN(INITIAL);
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BUFFER_PUSH(quoted_buffer) = 0;
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cf_lval.t = cfg_strdup(quoted_buffer_data);
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return TEXT;
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}
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<QUOTED>. BUFFER_PUSH(quoted_buffer) = yytext[0];
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<INITIAL,COMMENT><<EOF>> { if (check_eof()) return END; }
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{WHITE}+
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\n ifs->lino++; ifs->chno = 0;
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# BEGIN(COMMENT);
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\/\* BEGIN(CCOMM);
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. cf_error("Unknown character");
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<COMMENT>\n {
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ifs->lino++;
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ifs->chno = 0;
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BEGIN(INITIAL);
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}
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<COMMENT>.
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<CCOMM>\*\/ BEGIN(INITIAL);
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<CCOMM>\n ifs->lino++; ifs->chno = 0;
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<CCOMM>\/\* cf_error("Comment nesting not supported");
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<CCOMM><<EOF>> cf_error("Unterminated comment");
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<CCOMM>.
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\!\= return NEQ;
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\!\~ return NMA;
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\<\= return LEQ;
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\>\= return GEQ;
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\&\& return AND;
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\|\| return OR;
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\[\= return PO;
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\=\] return PC;
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%%
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static uint
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cf_hash(const byte *c)
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{
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uint h = 13 << 24;
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while (*c)
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h = h + (h >> 2) + (h >> 5) + ((uint) *c++ << 24);
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return h;
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}
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/*
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* IFS stack - it contains structures needed for recursive processing
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* of include in config files. On the top of the stack is a structure
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* for currently processed file. Other structures are either for
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* active files interrupted because of include directive (these have
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* fd and flex buffer) or for inactive files scheduled to be processed
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* later (when parent requested including of several files by wildcard
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* match - these do not have fd and flex buffer yet).
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*
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* FIXME: Most of these ifs and include functions are really sysdep/unix.
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*/
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static struct include_file_stack *
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push_ifs(struct include_file_stack *old)
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{
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struct include_file_stack *ret;
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ret = cfg_allocz(sizeof(struct include_file_stack));
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ret->lino = 1;
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ret->prev = old;
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return ret;
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}
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static struct include_file_stack *
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pop_ifs(struct include_file_stack *old)
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{
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yy_delete_buffer(old->buffer);
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close(old->fd);
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return old->prev;
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}
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static void
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enter_ifs(struct include_file_stack *new)
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{
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if (!new->buffer)
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{
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new->fd = open(new->file_name, O_RDONLY);
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if (new->fd < 0)
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{
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ifs = ifs->up;
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cf_error("Unable to open included file %s: %m", new->file_name);
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}
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new->buffer = yy_create_buffer(NULL, YY_BUF_SIZE);
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}
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yy_switch_to_buffer(new->buffer);
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}
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/**
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* cf_lex_unwind - unwind lexer state during error
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*
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* cf_lex_unwind() frees the internal state on IFS stack when the lexical
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* analyzer is terminated by cf_error().
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*/
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void
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cf_lex_unwind(void)
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{
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struct include_file_stack *n;
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for (n = ifs; n != ifs_head; n = n->prev)
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{
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/* Memory is freed automatically */
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if (n->buffer)
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yy_delete_buffer(n->buffer);
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if (n->fd)
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close(n->fd);
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}
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ifs = ifs_head;
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}
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static void
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cf_include(char *arg, int alen)
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{
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struct include_file_stack *base_ifs = ifs;
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int new_depth, rv, i;
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char *patt;
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glob_t g = {};
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new_depth = ifs->depth + 1;
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if (new_depth > MAX_INCLUDE_DEPTH)
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cf_error("Max include depth reached");
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/* expand arg to properly handle relative filenames */
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if (*arg != '/')
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{
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int dlen = strlen(ifs->file_name);
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char *dir = alloca(dlen + 1);
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patt = alloca(dlen + alen + 2);
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memcpy(dir, ifs->file_name, dlen + 1);
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sprintf(patt, "%s/%s", dirname(dir), arg);
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}
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else
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patt = arg;
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/* Skip globbing if there are no wildcards, mainly to get proper
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response when the included config file is missing */
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if (!strpbrk(arg, "?*["))
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{
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ifs = push_ifs(ifs);
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ifs->file_name = cfg_strdup(patt);
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ifs->depth = new_depth;
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ifs->up = base_ifs;
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enter_ifs(ifs);
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return;
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}
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/* Expand the pattern */
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rv = glob(patt, GLOB_ERR | GLOB_NOESCAPE, NULL, &g);
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if (rv == GLOB_ABORTED)
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cf_error("Unable to match pattern %s: %m", patt);
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if ((rv != 0) || (g.gl_pathc <= 0))
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return;
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/*
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* Now we put all found files to ifs stack in reverse order, they
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* will be activated and processed in order as ifs stack is popped
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* by pop_ifs() and enter_ifs() in check_eof().
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*/
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for(i = g.gl_pathc - 1; i >= 0; i--)
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{
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char *fname = g.gl_pathv[i];
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struct stat fs;
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if (stat(fname, &fs) < 0)
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{
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globfree(&g);
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cf_error("Unable to stat included file %s: %m", fname);
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|
}
|
|
|
|
if (fs.st_mode & S_IFDIR)
|
|
continue;
|
|
|
|
/* Prepare new stack item */
|
|
ifs = push_ifs(ifs);
|
|
ifs->file_name = cfg_strdup(fname);
|
|
ifs->depth = new_depth;
|
|
ifs->up = base_ifs;
|
|
}
|
|
|
|
globfree(&g);
|
|
enter_ifs(ifs);
|
|
}
|
|
|
|
static int
|
|
check_eof(void)
|
|
{
|
|
if (ifs == ifs_head)
|
|
{
|
|
/* EOF in main config file */
|
|
ifs->lino = 1; /* Why this? */
|
|
return 1;
|
|
}
|
|
|
|
ifs = pop_ifs(ifs);
|
|
enter_ifs(ifs);
|
|
return 0;
|
|
}
|
|
|
|
static struct symbol *
|
|
cf_new_symbol(const byte *c)
|
|
{
|
|
struct symbol *s;
|
|
|
|
uint l = strlen(c);
|
|
if (l > SYM_MAX_LEN)
|
|
cf_error("Symbol too long");
|
|
|
|
s = cfg_allocz(sizeof(struct symbol) + l + 1);
|
|
*s = (struct symbol) { .scope = conf_this_scope, .class = SYM_VOID, };
|
|
strcpy(s->name, c);
|
|
|
|
if (!new_config->sym_hash.data)
|
|
HASH_INIT(new_config->sym_hash, new_config->pool, SYM_ORDER);
|
|
|
|
HASH_INSERT2(new_config->sym_hash, SYM, new_config->pool, s);
|
|
|
|
add_tail(&(new_config->symbols), &(s->n));
|
|
|
|
return s;
|
|
}
|
|
|
|
/**
|
|
* cf_find_symbol - find a symbol by name
|
|
* @cfg: specificed config
|
|
* @c: symbol name
|
|
*
|
|
* This functions searches the symbol table in the config @cfg for a symbol of
|
|
* given name. First it examines the current scope, then the second recent one
|
|
* and so on until it either finds the symbol and returns a pointer to its
|
|
* &symbol structure or reaches the end of the scope chain and returns %NULL to
|
|
* signify no match.
|
|
*/
|
|
struct symbol *
|
|
cf_find_symbol(const struct config *cfg, const byte *c)
|
|
{
|
|
struct symbol *s;
|
|
|
|
if (cfg->sym_hash.data &&
|
|
(s = HASH_FIND(cfg->sym_hash, SYM, c, 1)))
|
|
return s;
|
|
|
|
/* In CLI command parsing, fallback points to the current config, otherwise it is NULL. */
|
|
if (cfg->fallback &&
|
|
cfg->fallback->sym_hash.data &&
|
|
(s = HASH_FIND(cfg->fallback->sym_hash, SYM, c, 1)))
|
|
return s;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* cf_get_symbol - get a symbol by name
|
|
* @c: symbol name
|
|
*
|
|
* This functions searches the symbol table of the currently parsed config
|
|
* (@new_config) for a symbol of given name. It returns either the already
|
|
* existing symbol or a newly allocated undefined (%SYM_VOID) symbol if no
|
|
* existing symbol is found.
|
|
*/
|
|
struct symbol *
|
|
cf_get_symbol(const byte *c)
|
|
{
|
|
return cf_find_symbol(new_config, c) ?: cf_new_symbol(c);
|
|
}
|
|
|
|
/**
|
|
* cf_localize_symbol - get the local instance of given symbol
|
|
* @sym: the symbol to localize
|
|
*
|
|
* This functions finds the symbol that is local to current scope
|
|
* for purposes of cf_define_symbol().
|
|
*/
|
|
struct symbol *
|
|
cf_localize_symbol(struct symbol *sym)
|
|
{
|
|
/* If the symbol type is void, it has been recently allocated just in this scope. */
|
|
if (!sym->class)
|
|
return sym;
|
|
|
|
/* If the scope is the current, it is already defined in this scope. */
|
|
if (sym->scope == conf_this_scope)
|
|
cf_error("Symbol already defined");
|
|
|
|
/* Not allocated here yet, doing it now. */
|
|
return cf_new_symbol(sym->name);
|
|
}
|
|
|
|
struct symbol *
|
|
cf_default_name(char *template, int *counter)
|
|
{
|
|
char buf[SYM_MAX_LEN];
|
|
struct symbol *s;
|
|
char *perc = strchr(template, '%');
|
|
|
|
for(;;)
|
|
{
|
|
bsprintf(buf, template, ++(*counter));
|
|
s = cf_get_symbol(buf);
|
|
if (s->class == SYM_VOID)
|
|
return s;
|
|
if (!perc)
|
|
break;
|
|
}
|
|
cf_error("Unable to generate default name");
|
|
}
|
|
|
|
static enum yytokentype
|
|
cf_lex_symbol(const char *data)
|
|
{
|
|
/* Have we defined such a symbol? */
|
|
struct symbol *sym = cf_get_symbol(data);
|
|
cf_lval.s = sym;
|
|
|
|
if (sym->class != SYM_VOID)
|
|
return CF_SYM_KNOWN;
|
|
|
|
/* Is it a keyword? */
|
|
struct keyword *k = HASH_FIND(kw_hash, KW, data);
|
|
if (k)
|
|
{
|
|
if (k->value > 0)
|
|
return k->value;
|
|
else
|
|
{
|
|
cf_lval.i = -k->value;
|
|
return ENUM;
|
|
}
|
|
}
|
|
|
|
/* OK, undefined symbol */
|
|
cf_lval.s = sym;
|
|
return CF_SYM_UNDEFINED;
|
|
}
|
|
|
|
static void
|
|
cf_lex_init_kh(void)
|
|
{
|
|
HASH_INIT(kw_hash, &root_pool, KW_ORDER);
|
|
|
|
struct keyword *k;
|
|
for (k=keyword_list; k->name; k++)
|
|
HASH_INSERT(kw_hash, KW, k);
|
|
}
|
|
|
|
/**
|
|
* cf_lex_init - initialize the lexer
|
|
* @is_cli: true if we're going to parse CLI command, false for configuration
|
|
* @c: configuration structure
|
|
*
|
|
* cf_lex_init() initializes the lexical analyzer and prepares it for
|
|
* parsing of a new input.
|
|
*/
|
|
void
|
|
cf_lex_init(int is_cli, struct config *c)
|
|
{
|
|
if (!kw_hash.data)
|
|
cf_lex_init_kh();
|
|
|
|
ifs_head = ifs = push_ifs(NULL);
|
|
if (!is_cli)
|
|
{
|
|
ifs->file_name = c->file_name;
|
|
ifs->fd = c->file_fd;
|
|
ifs->depth = 1;
|
|
}
|
|
|
|
yyrestart(NULL);
|
|
ifs->buffer = YY_CURRENT_BUFFER;
|
|
|
|
if (is_cli)
|
|
BEGIN(CLI);
|
|
else
|
|
BEGIN(INITIAL);
|
|
|
|
c->root_scope = cfg_allocz(sizeof(struct sym_scope));
|
|
conf_this_scope = c->root_scope;
|
|
conf_this_scope->active = 1;
|
|
}
|
|
|
|
/**
|
|
* cf_push_scope - enter new scope
|
|
* @sym: symbol representing scope name
|
|
*
|
|
* If we want to enter a new scope to process declarations inside
|
|
* a nested block, we can just call cf_push_scope() to push a new
|
|
* scope onto the scope stack which will cause all new symbols to be
|
|
* defined in this scope and all existing symbols to be sought for
|
|
* in all scopes stored on the stack.
|
|
*/
|
|
void
|
|
cf_push_scope(struct symbol *sym)
|
|
{
|
|
struct sym_scope *s = cfg_allocz(sizeof(struct sym_scope));
|
|
|
|
s->next = conf_this_scope;
|
|
conf_this_scope = s;
|
|
s->active = 1;
|
|
s->name = sym;
|
|
s->slots = 0;
|
|
}
|
|
|
|
/**
|
|
* cf_pop_scope - leave a scope
|
|
*
|
|
* cf_pop_scope() pops the topmost scope from the scope stack,
|
|
* leaving all its symbols in the symbol table, but making them
|
|
* invisible to the rest of the config.
|
|
*/
|
|
void
|
|
cf_pop_scope(void)
|
|
{
|
|
conf_this_scope->active = 0;
|
|
conf_this_scope = conf_this_scope->next;
|
|
|
|
ASSERT(conf_this_scope);
|
|
}
|
|
|
|
/**
|
|
* cf_symbol_class_name - get name of a symbol class
|
|
* @sym: symbol
|
|
*
|
|
* This function returns a string representing the class
|
|
* of the given symbol.
|
|
*/
|
|
char *
|
|
cf_symbol_class_name(struct symbol *sym)
|
|
{
|
|
switch (sym->class)
|
|
{
|
|
case SYM_VOID:
|
|
return "undefined";
|
|
case SYM_PROTO:
|
|
return "protocol";
|
|
case SYM_TEMPLATE:
|
|
return "protocol template";
|
|
case SYM_FUNCTION:
|
|
return "function";
|
|
case SYM_FILTER:
|
|
return "filter";
|
|
case SYM_TABLE:
|
|
return "routing table";
|
|
case SYM_ATTRIBUTE:
|
|
return "custom attribute";
|
|
case SYM_CONSTANT_RANGE:
|
|
return "constant";
|
|
case SYM_VARIABLE_RANGE:
|
|
return "variable";
|
|
default:
|
|
return "unknown type";
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* DOC: Parser
|
|
*
|
|
* Both the configuration and CLI commands are analyzed using a syntax
|
|
* driven parser generated by the |bison| tool from a grammar which
|
|
* is constructed from information gathered from grammar snippets by
|
|
* the |gen_parser.m4| script.
|
|
*
|
|
* Grammar snippets are files (usually with extension |.Y|) contributed
|
|
* by various BIRD modules in order to provide information about syntax of their
|
|
* configuration and their CLI commands. Each snipped consists of several
|
|
* sections, each of them starting with a special keyword: |CF_HDR| for
|
|
* a list of |#include| directives needed by the C code, |CF_DEFINES|
|
|
* for a list of C declarations, |CF_DECLS| for |bison| declarations
|
|
* including keyword definitions specified as |CF_KEYWORDS|, |CF_GRAMMAR|
|
|
* for the grammar rules, |CF_CODE| for auxiliary C code and finally
|
|
* |CF_END| at the end of the snippet.
|
|
*
|
|
* To create references between the snippets, it's possible to define
|
|
* multi-part rules by utilizing the |CF_ADDTO| macro which adds a new
|
|
* alternative to a multi-part rule.
|
|
*
|
|
* CLI commands are defined using a |CF_CLI| macro. Its parameters are:
|
|
* the list of keywords determining the command, the list of parameters,
|
|
* help text for the parameters and help text for the command.
|
|
*
|
|
* Values of |enum| filter types can be defined using |CF_ENUM| with
|
|
* the following parameters: name of filter type, prefix common for all
|
|
* literals of this type and names of all the possible values.
|
|
*/
|