mirror of
https://gitlab.nic.cz/labs/bird.git
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354 lines
6.3 KiB
Plaintext
354 lines
6.3 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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#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 "nest/bird.h"
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#include "nest/route.h"
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#include "filter/filter.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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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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#define KW_HASH_SIZE 64
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static struct keyword *kw_hash[KW_HASH_SIZE];
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static int kw_hash_inited;
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#define SYM_HASH_SIZE 128
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#define SYM_MAX_LEN 32
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struct sym_scope {
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struct sym_scope *next; /* Next on scope stack */
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struct symbol *name; /* Name of this scope */
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int active; /* Currently entered */
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};
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static struct sym_scope *conf_this_scope;
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int conf_lino;
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static int cf_hash(byte *c);
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static struct symbol *cf_find_sym(byte *c, unsigned int h0);
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linpool *cfg_mem;
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int (*cf_read_hook)(byte *buf, unsigned int max);
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#define YY_INPUT(buf,result,max) result = cf_read_hook(buf, max);
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#define YY_NO_UNPUT
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#define YY_FATAL_ERROR(msg) cf_error(msg)
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%}
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%option noyywrap
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%x COMMENT CCOMM CLI
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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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{DIGIT}+\.{DIGIT}+\.{DIGIT}+\.{DIGIT}+ {
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#ifdef IPV6
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if (ipv4_pton_u32(yytext, &cf_lval.i32))
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return RTRID;
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cf_error("Invalid IPv4 address %s", yytext);
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#else
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if (ip_pton(yytext, &cf_lval.a))
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return IPA;
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cf_error("Invalid IP address %s", yytext);
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#endif
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}
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({XIGIT}*::|({XIGIT}*:){3,})({XIGIT}*|{DIGIT}+\.{DIGIT}+\.{DIGIT}+\.{DIGIT}+) {
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#ifdef IPV6
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if (ip_pton(yytext, &cf_lval.a))
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return IPA;
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cf_error("Invalid IP address %s", yytext);
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#else
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cf_error("This is an IPv4 router, therefore IPv6 addresses are not supported");
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#endif
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}
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0x{DIGIT}+ {
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char *e;
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long int l;
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errno = 0;
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l = strtoul(yytext+2, &e, 16);
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if (e && *e || errno == ERANGE || (long int)(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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long int l;
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errno = 0;
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l = strtoul(yytext, &e, 10);
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if (e && *e || errno == ERANGE || (long int)(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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{ALPHA}{ALNUM}* {
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unsigned int h = cf_hash(yytext);
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struct keyword *k = kw_hash[h & (KW_HASH_SIZE-1)];
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while (k)
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{
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if (!strcmp(k->name, yytext))
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{
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if (k->value > 0)
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return k->value;
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else
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{
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cf_lval.i = -k->value;
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return ENUM;
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}
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}
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k=k->next;
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}
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cf_lval.s = cf_find_sym(yytext, h);
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return SYM;
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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 yytext[0];
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}
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["][^"\n]*["] {
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yytext[yyleng-1] = 0;
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cf_lval.t = cfg_strdup(yytext+1);
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return TEXT;
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}
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["][^"\n]*\n cf_error("Unterminated string");
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<INITIAL,COMMENT><<EOF>> return END;
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{WHITE}+
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\n conf_lino++;
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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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conf_lino++;
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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 conf_lino++;
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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 LEQ;
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\>\= return GEQ;
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%%
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static int
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cf_hash(byte *c)
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{
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unsigned int h = 13;
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while (*c)
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h = (h * 37) + *c++;
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return h;
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}
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static struct symbol *
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cf_find_sym(byte *c, unsigned int h0)
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{
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unsigned int h = h0 & (SYM_HASH_SIZE-1);
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struct symbol *s, **ht;
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int l;
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if (ht = new_config->sym_hash)
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{
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for(s = ht[h]; s; s=s->next)
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if (!strcmp(s->name, c) && s->scope->active)
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return s;
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}
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if (new_config->sym_fallback)
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{
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/* We know only top-level scope is active */
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for(s = new_config->sym_fallback[h]; s; s=s->next)
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if (!strcmp(s->name, c) && s->scope->active)
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return s;
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}
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if (!ht)
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ht = new_config->sym_hash = cfg_allocz(SYM_HASH_SIZE * sizeof(struct keyword *));
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l = strlen(c);
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if (l > SYM_MAX_LEN)
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cf_error("Symbol too long");
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s = cfg_alloc(sizeof(struct symbol) + l);
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s->next = ht[h];
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ht[h] = s;
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s->scope = conf_this_scope;
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s->class = SYM_VOID;
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s->def = NULL;
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s->aux = 0;
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strcpy(s->name, c);
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return s;
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}
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struct symbol *
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cf_find_symbol(byte *c)
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{
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return cf_find_sym(c, cf_hash(c));
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}
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struct symbol *
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cf_default_name(char *template, int *counter)
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{
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char buf[32];
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struct symbol *s;
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char *perc = strchr(template, '%');
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for(;;)
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{
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bsprintf(buf, template, ++(*counter));
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s = cf_find_sym(buf, cf_hash(buf));
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if (!s)
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break;
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if (s->class == SYM_VOID)
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return s;
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if (!perc)
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break;
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}
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cf_error("Unable to generate default name");
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}
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void
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cf_define_symbol(struct symbol *sym, int type, void *def)
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{
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if (sym->class)
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cf_error("Symbol already defined");
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sym->class = type;
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sym->def = def;
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}
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static void
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cf_lex_init_kh(void)
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{
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struct keyword *k;
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for(k=keyword_list; k->name; k++)
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{
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unsigned h = cf_hash(k->name) & (KW_HASH_SIZE-1);
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k->next = kw_hash[h];
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kw_hash[h] = k;
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}
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kw_hash_inited = 1;
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}
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void
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cf_lex_init(int is_cli)
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{
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if (!kw_hash_inited)
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cf_lex_init_kh();
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conf_lino = 1;
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yyrestart(NULL);
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if (is_cli)
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BEGIN(CLI);
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else
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BEGIN(INITIAL);
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conf_this_scope = cfg_allocz(sizeof(struct sym_scope));
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conf_this_scope->active = 1;
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}
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void
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cf_push_scope(struct symbol *sym)
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{
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struct sym_scope *s = cfg_alloc(sizeof(struct sym_scope));
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s->next = conf_this_scope;
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conf_this_scope = s;
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s->active = 1;
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s->name = sym;
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}
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void
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cf_pop_scope(void)
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{
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conf_this_scope->active = 0;
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conf_this_scope = conf_this_scope->next;
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ASSERT(conf_this_scope);
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}
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struct symbol *
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cf_walk_symbols(struct config *cf, struct symbol *sym, int *pos)
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{
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for(;;)
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{
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if (!sym)
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{
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if (*pos >= SYM_HASH_SIZE)
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return NULL;
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sym = cf->sym_hash[(*pos)++];
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}
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else
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sym = sym->next;
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if (sym && sym->scope->active)
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return sym;
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}
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}
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char *
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cf_symbol_class_name(struct symbol *sym)
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{
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switch (sym->class)
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{
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case SYM_VOID:
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return "undefined";
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case SYM_PROTO:
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return "protocol";
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case SYM_NUMBER:
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return "numeric constant";
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case SYM_FUNCTION:
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return "function";
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case SYM_FILTER:
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return "filter";
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case SYM_TABLE:
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return "routing table";
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default:
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return "unknown type";
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}
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}
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