/* * BIRD -- Configuration Lexer * * (c) 1998--1999 Martin Mares <mj@ucw.cz> * * Can be freely distributed and used under the terms of the GNU GPL. */ %{ #undef REJECT /* Avoid name clashes */ #include <errno.h> #include <stdlib.h> #include <string.h> #include <stdarg.h> #include "nest/bird.h" #include "nest/route.h" #include "filter/filter.h" #include "conf/conf.h" #include "conf/cf-parse.tab.h" static struct keyword { byte *name; int value; struct keyword *next; } keyword_list[] = { #include "conf/keywords.h" { NULL, -1 } }; #define KW_HASH_SIZE 64 static struct keyword *kw_hash[KW_HASH_SIZE]; static int kw_hash_inited; #define SYM_HASH_SIZE 128 #define SYM_MAX_LEN 32 struct sym_scope { struct sym_scope *next; /* Next on scope stack */ struct symbol *name; /* Name of this scope */ int active; /* Currently entered */ }; static struct sym_scope *conf_this_scope; int conf_lino; static int cf_hash(byte *c); static struct symbol *cf_find_sym(byte *c, unsigned int h0); linpool *cfg_mem; int (*cf_read_hook)(byte *buf, unsigned int max); #define YY_INPUT(buf,result,max) result = cf_read_hook(buf, max); #define YY_NO_UNPUT #define YY_FATAL_ERROR(msg) cf_error(msg) %} %option noyywrap %x COMMENT CCOMM CLI ALPHA [a-zA-Z_] DIGIT [0-9] XIGIT [0-9a-fA-F] ALNUM [a-zA-Z_0-9] WHITE [ \t] %% {DIGIT}+\.{DIGIT}+\.{DIGIT}+\.{DIGIT}+ { #ifdef IPV6 if (ipv4_pton_u32(yytext, &cf_lval.i32)) return RTRID; cf_error("Invalid IPv4 address %s", yytext); #else if (ip_pton(yytext, &cf_lval.a)) return IPA; cf_error("Invalid IP address %s", yytext); #endif } ({XIGIT}*::|({XIGIT}*:){3,})({XIGIT}*|{DIGIT}+\.{DIGIT}+\.{DIGIT}+\.{DIGIT}+) { #ifdef IPV6 if (ip_pton(yytext, &cf_lval.a)) return IPA; cf_error("Invalid IP address %s", yytext); #else cf_error("This is an IPv4 router, therefore IPv6 addresses are not supported"); #endif } 0x{DIGIT}+ { char *e; long int l; errno = 0; l = strtoul(yytext+2, &e, 16); if (e && *e || errno == ERANGE || (long int)(int) l != l) cf_error("Number out of range"); cf_lval.i = l; return NUM; } {DIGIT}+ { char *e; long int l; errno = 0; l = strtoul(yytext, &e, 10); if (e && *e || errno == ERANGE || (long int)(int) l != l) cf_error("Number out of range"); cf_lval.i = l; return NUM; } {ALPHA}{ALNUM}* { unsigned int h = cf_hash(yytext); struct keyword *k = kw_hash[h & (KW_HASH_SIZE-1)]; while (k) { if (!strcmp(k->name, yytext)) { if (k->value > 0) return k->value; else { cf_lval.i = -k->value; return ENUM; } } k=k->next; } cf_lval.s = cf_find_sym(yytext, h); return SYM; } <CLI>(.|\n) { BEGIN(INITIAL); return CLI_MARKER; } [={}:;,()+*/%-<>~\[\]] { return yytext[0]; } ["][^"\n]*["] { cf_lval.t = yytext+1; yytext[yyleng-1] = 0; return TEXT; } ["][^"\n]*\n cf_error("Unterminated string"); <INITIAL,COMMENT><<EOF>> return END; {WHITE}+ \n conf_lino++; # BEGIN(COMMENT); \/\* BEGIN(CCOMM); . cf_error("Unknown character"); <COMMENT>\n { conf_lino++; BEGIN(INITIAL); } <COMMENT>. <CCOMM>\*\/ BEGIN(INITIAL); <CCOMM>\n conf_lino++; <CCOMM>\/\* cf_error("Comment nesting not supported"); <CCOMM><<EOF>> cf_error("Unterminated comment"); <CCOMM>. %% static int cf_hash(byte *c) { unsigned int h = 13; while (*c) h = (h * 37) + *c++; return h; } static struct symbol * cf_find_sym(byte *c, unsigned int h0) { unsigned int h = h0 & (SYM_HASH_SIZE-1); struct symbol *s, **ht; int l; if (ht = new_config->sym_hash) { for(s = ht[h]; s; s=s->next) if (!strcmp(s->name, c) && s->scope->active) return s; } if (new_config->sym_fallback) { /* We know only top-level scope is active */ for(s = new_config->sym_fallback[h]; s; s=s->next) if (!strcmp(s->name, c) && s->scope->active) return s; } if (!ht) ht = new_config->sym_hash = cfg_allocz(SYM_HASH_SIZE * sizeof(struct keyword *)); l = strlen(c); if (l > SYM_MAX_LEN) cf_error("Symbol too long"); s = cfg_alloc(sizeof(struct symbol) + l); s->next = ht[h]; ht[h] = s; s->scope = conf_this_scope; s->class = SYM_VOID; s->def = NULL; s->aux = 0; strcpy(s->name, c); return s; } struct symbol * cf_find_symbol(byte *c) { return cf_find_sym(c, cf_hash(c)); } struct symbol * cf_default_name(char *prefix, int *counter) { char buf[32]; struct symbol *s; do { sprintf(buf, "%s%d", prefix, ++(*counter)); s = cf_find_sym(buf, cf_hash(buf)); if (!s) cf_error("Unable to generate default name"); } while (s->class != SYM_VOID); return s; } void cf_define_symbol(struct symbol *sym, int type, void *def) { if (sym->class) cf_error("Symbol already defined"); sym->class = type; sym->def = def; } static void cf_lex_init_kh(void) { struct keyword *k; for(k=keyword_list; k->name; k++) { unsigned h = cf_hash(k->name) & (KW_HASH_SIZE-1); k->next = kw_hash[h]; kw_hash[h] = k; } kw_hash_inited = 1; } void cf_lex_init(int is_cli) { if (!kw_hash_inited) cf_lex_init_kh(); conf_lino = 1; yyrestart(NULL); if (is_cli) BEGIN(CLI); else BEGIN(INITIAL); conf_this_scope = cfg_allocz(sizeof(struct sym_scope)); conf_this_scope->active = 1; } void cf_push_scope(struct symbol *sym) { struct sym_scope *s = cfg_alloc(sizeof(struct sym_scope)); s->next = conf_this_scope; conf_this_scope = s; s->active = 1; s->name = sym; } void cf_pop_scope(void) { conf_this_scope->active = 0; conf_this_scope = conf_this_scope->next; ASSERT(conf_this_scope); }