/* $OpenBSD: parse.y,v 1.1 2006/10/18 16:11:58 norby Exp $ */ /* * Copyright (c) 2006 Michele Marchetto * Copyright (c) 2004, 2005 Esben Norby * Copyright (c) 2004 Ryan McBride * Copyright (c) 2002, 2003, 2004 Henning Brauer * Copyright (c) 2001 Markus Friedl. All rights reserved. * Copyright (c) 2001 Daniel Hartmeier. All rights reserved. * Copyright (c) 2001 Theo de Raadt. All rights reserved. * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ %{ #include #include #include #include #include #include #include #include #include #include #include #include #include "ripd.h" #include "rip.h" #include "ripe.h" #include "log.h" static struct ripd_conf *conf; static FILE *fin = NULL; static int lineno = 1; static int errors = 0; static int pdebug = 1; char *infile; char *start_state; struct iface *iface = NULL; int yyerror(const char *, ...); int yyparse(void); int kw_cmp(const void *, const void *); int lookup(char *); int lgetc(FILE *); int lungetc(int); int findeol(void); int yylex(void); void clear_config(struct ripd_conf *); int check_file_secrecy(int fd, const char *fname); u_int32_t get_rtr_id(void); static struct { char auth_key[MAX_SIMPLE_AUTH_LEN]; struct auth_md_head md_list; enum auth_type auth_type; u_int8_t auth_keyid; u_int8_t cost; } *defs, globaldefs, ifacedefs; TAILQ_HEAD(symhead, sym) symhead = TAILQ_HEAD_INITIALIZER(symhead); struct sym { TAILQ_ENTRY(sym) entries; int used; int persist; char *nam; char *val; }; int symset(const char *, const char *, int); char *symget(const char *); int atoul(char *, u_long *); struct iface *conf_get_if(struct kif *); typedef struct { union { u_int32_t number; char *string; } v; int lineno; } YYSTYPE; %} %token SPLIT_HORIZON TRIGGERED_UPDATES FIBUPDATE REDISTRIBUTE %token AUTHKEY AUTHTYPE AUTHMD AUTHMDKEYID %token INTERFACE %token COST PASSIVE %token ERROR %token STRING %type number yesno %type string %% grammar : /* empty */ | grammar '\n' | grammar conf_main '\n' | grammar varset '\n' | grammar interface '\n' ; number : STRING { u_long ulval; if (atoul($1, &ulval) == -1) { yyerror("%s is not a number", $1); free($1); YYERROR; } else $$ = ulval; free($1); } ; string : string STRING { if (asprintf(&$$, "%s %s", $1, $2) == -1) { free($1); free($2); yyerror("string: asprintf"); YYERROR; } free($1); free($2); } | STRING ; yesno : STRING { if (!strcmp($1, "yes")) $$ = 1; else if (!strcmp($1, "no")) $$ = 0; else { free($1); yyerror("recognized values are yes or no"); YYERROR; } free($1); } ; varset : STRING '=' string { if (conf->opts & RIPD_OPT_VERBOSE) printf("%s = \"%s\"\n", $1, $3); if (symset($1, $3, 0) == -1) fatal("cannot store variable"); free($1); free($3); } ; conf_main : SPLIT_HORIZON STRING { /* clean flags first */ conf->options &= ~(OPT_SPLIT_HORIZON | OPT_SPLIT_POISONED); if (!strcmp($2, "none")) /* nothing */ ; else if (!strcmp($2, "default")) conf->options |= OPT_SPLIT_HORIZON; else if (!strcmp($2, "poisoned")) conf->options |= OPT_SPLIT_POISONED; else { yyerror("unknon split horizon type"); free($2); YYERROR; } free($2); } | TRIGGERED_UPDATES yesno { if ($2 == 1) conf->options |= OPT_TRIGGERED_UPDATES; else conf->options &= ~OPT_TRIGGERED_UPDATES; } | FIBUPDATE yesno { if ($2 == 0) conf->flags |= RIPD_FLAG_NO_FIB_UPDATE; else conf->flags &= ~RIPD_FLAG_NO_FIB_UPDATE; } | REDISTRIBUTE STRING { if (!strcmp($2, "static")) conf->redistribute_flags |= REDISTRIBUTE_STATIC; else if (!strcmp($2, "connected")) conf->redistribute_flags |= REDISTRIBUTE_CONNECTED; else if (!strcmp($2, "default")) conf->redistribute_flags |= REDISTRIBUTE_DEFAULT; else if (!strcmp($2, "none")) conf->redistribute_flags = 0; else { yyerror("unknown redistribute type"); free($2); YYERROR; } free($2); } ; authmd : AUTHMD number STRING { if ($2 < MIN_MD_ID || $2 > MAX_MD_ID) { yyerror("auth-md key-id out of range " "(%d-%d)", MIN_MD_ID, MAX_MD_ID); free($3); YYERROR; } if (strlen($3) > MD5_DIGEST_LENGTH) { yyerror("auth-md key length out of range " "(max length %d)", MD5_DIGEST_LENGTH); free($3); YYERROR; } md_list_add(&defs->md_list, $2, $3); free($3); } authmdkeyid : AUTHMDKEYID number { if ($2 < MIN_MD_ID || $2 > MAX_MD_ID) { yyerror("auth-md-keyid out of range " "(%d-%d)", MIN_MD_ID, MAX_MD_ID); YYERROR; } defs->auth_keyid = $2; } authtype : AUTHTYPE STRING { enum auth_type type; if (!strcmp($2, "none")) type = AUTH_NONE; else if (!strcmp($2, "simple")) type = AUTH_SIMPLE; else if (!strcmp($2, "crypt")) type = AUTH_CRYPT; else { yyerror("unknown auth-type"); free($2); YYERROR; } free($2); defs->auth_type = type; } ; authkey : AUTHKEY STRING { if (strlen($2) > MAX_SIMPLE_AUTH_LEN) { yyerror("auth-key too long (max lenght %d)", MAX_SIMPLE_AUTH_LEN); free($2); YYERROR; } strncpy(defs->auth_key, $2, sizeof(defs->auth_key)); free($2); } ; defaults : COST number { if ($2 < 1 || $2 > INFINITY) { yyerror("cost out of range (%d-%d)", 1, INFINITY); YYERROR; } defs->cost = $2; } | authtype | authkey | authmdkeyid | authmd ; optnl : '\n' optnl | ; nl : '\n' optnl ; interface : INTERFACE STRING { struct kif *kif; if ((kif = kif_findname($2)) == NULL) { yyerror("unknown interface %s", $2); free($2); YYERROR; } free($2); iface = conf_get_if(kif); if (iface == NULL) YYERROR; LIST_INSERT_HEAD(&conf->iface_list, iface, entry); memcpy(&ifacedefs, defs, sizeof(ifacedefs)); md_list_copy(&ifacedefs.md_list, &defs->md_list); defs = &ifacedefs; } interface_block { iface->cost = defs->cost; iface->auth_type = defs->auth_type; iface->auth_keyid = defs->auth_keyid; memcpy(iface->auth_key, defs->auth_key, sizeof(iface->auth_key)); md_list_copy(&iface->auth_md_list, &defs->md_list); md_list_clr(&defs->md_list); defs = &globaldefs; } ; interface_block : '{' optnl interfaceopts_l '}' | '{' optnl '}' ; interfaceopts_l : interfaceopts_l interfaceoptsl | interfaceoptsl ; interfaceoptsl : PASSIVE nl { iface->passive = 1; } | defaults nl ; %% struct keywords { const char *k_name; int k_val; }; int yyerror(const char *fmt, ...) { va_list ap; errors = 1; va_start(ap, fmt); fprintf(stderr, "%s:%d: ", infile, yylval.lineno); vfprintf(stderr, fmt, ap); fprintf(stderr, "\n"); va_end(ap); return (0); } int kw_cmp(const void *k, const void *e) { return (strcmp(k, ((const struct keywords *)e)->k_name)); } int lookup(char *s) { /* this has to be sorted always */ static const struct keywords keywords[] = { {"auth-key", AUTHKEY}, {"auth-md", AUTHMD}, {"auth-md-keyid", AUTHMDKEYID}, {"auth-type", AUTHTYPE}, {"cost", COST}, {"fib-update", FIBUPDATE}, {"interface", INTERFACE}, {"passive", PASSIVE}, {"redistribute", REDISTRIBUTE}, {"split-horizon", SPLIT_HORIZON}, {"triggered-updates", TRIGGERED_UPDATES} }; const struct keywords *p; p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]), sizeof(keywords[0]), kw_cmp); if (p) { if (pdebug > 1) fprintf(stderr, "%s: %d\n", s, p->k_val); return (p->k_val); } else { if (pdebug > 1) fprintf(stderr, "string: %s\n", s); return (STRING); } } #define MAXPUSHBACK 128 char *parsebuf; int parseindex; char pushback_buffer[MAXPUSHBACK]; int pushback_index = 0; int lgetc(FILE *f) { int c, next; if (parsebuf) { /* Read character from the parsebuffer instead of input. */ if (parseindex >= 0) { c = parsebuf[parseindex++]; if (c != '\0') return (c); parsebuf = NULL; } else parseindex++; } if (pushback_index) return (pushback_buffer[--pushback_index]); while ((c = getc(f)) == '\\') { next = getc(f); if (next != '\n') { if (isspace(next)) yyerror("whitespace after \\"); ungetc(next, f); break; } yylval.lineno = lineno; lineno++; } if (c == '\t' || c == ' ') { /* Compress blanks to a single space. */ do { c = getc(f); } while (c == '\t' || c == ' '); ungetc(c, f); c = ' '; } return (c); } int lungetc(int c) { if (c == EOF) return (EOF); if (parsebuf) { parseindex--; if (parseindex >= 0) return (c); } if (pushback_index < MAXPUSHBACK-1) return (pushback_buffer[pushback_index++] = c); else return (EOF); } int findeol(void) { int c; parsebuf = NULL; pushback_index = 0; /* skip to either EOF or the first real EOL */ while (1) { c = lgetc(fin); if (c == '\n') { lineno++; break; } if (c == EOF) break; } return (ERROR); } int yylex(void) { char buf[8096]; char *p, *val; int endc, c; int token; top: p = buf; while ((c = lgetc(fin)) == ' ') ; /* nothing */ yylval.lineno = lineno; if (c == '#') while ((c = lgetc(fin)) != '\n' && c != EOF) ; /* nothing */ if (c == '$' && parsebuf == NULL) { while (1) { if ((c = lgetc(fin)) == EOF) return (0); if (p + 1 >= buf + sizeof(buf) - 1) { yyerror("string too long"); return (findeol()); } if (isalnum(c) || c == '_') { *p++ = (char)c; continue; } *p = '\0'; lungetc(c); break; } val = symget(buf); if (val == NULL) { yyerror("macro '%s' not defined", buf); return (findeol()); } parsebuf = val; parseindex = 0; goto top; } switch (c) { case '\'': case '"': endc = c; while (1) { if ((c = lgetc(fin)) == EOF) return (0); if (c == endc) { *p = '\0'; break; } if (c == '\n') { lineno++; continue; } if (p + 1 >= buf + sizeof(buf) - 1) { yyerror("string too long"); return (findeol()); } *p++ = (char)c; } yylval.v.string = strdup(buf); if (yylval.v.string == NULL) errx(1, "yylex: strdup"); return (STRING); } #define allowed_in_string(x) \ (isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \ x != '{' && x != '}' && \ x != '!' && x != '=' && x != '#' && \ x != ',')) if (isalnum(c) || c == ':' || c == '_') { do { *p++ = c; if ((unsigned)(p-buf) >= sizeof(buf)) { yyerror("string too long"); return (findeol()); } } while ((c = lgetc(fin)) != EOF && (allowed_in_string(c))); lungetc(c); *p = '\0'; if ((token = lookup(buf)) == STRING) if ((yylval.v.string = strdup(buf)) == NULL) err(1, "yylex: strdup"); return (token); } if (c == '\n') { yylval.lineno = lineno; lineno++; } if (c == EOF) return (0); return (c); } struct ripd_conf * parse_config(char *filename, int opts) { struct sym *sym, *next; if ((conf = calloc(1, sizeof(struct ripd_conf))) == NULL) fatal("parse_config"); bzero(&globaldefs, sizeof(globaldefs)); defs = &globaldefs; TAILQ_INIT(&defs->md_list); defs->cost = 1; defs->auth_type = AUTH_NONE; if ((fin = fopen(filename, "r")) == NULL) { warn("%s", filename); free(conf); return (NULL); } infile = filename; conf->opts = opts; conf->redistribute_flags = 0; if (!(conf->opts & RIPD_OPT_NOACTION)) if (check_file_secrecy(fileno(fin), filename)) { fclose(fin); free(conf); return (NULL); } yyparse(); fclose(fin); /* Free macros and check which have not been used. */ for (sym = TAILQ_FIRST(&symhead); sym != NULL; sym = next) { next = TAILQ_NEXT(sym, entries); if ((conf->opts & RIPD_OPT_VERBOSE2) && !sym->used) fprintf(stderr, "warning: macro '%s' not " "used\n", sym->nam); if (!sym->persist) { free(sym->nam); free(sym->val); TAILQ_REMOVE(&symhead, sym, entries); free(sym); } } /* free global config defaults */ md_list_clr(&globaldefs.md_list); if (errors) { clear_config(conf); return (NULL); } return (conf); } int symset(const char *nam, const char *val, int persist) { struct sym *sym; for (sym = TAILQ_FIRST(&symhead); sym && strcmp(nam, sym->nam); sym = TAILQ_NEXT(sym, entries)) ; /* nothing */ if (sym != NULL) { if (sym->persist == 1) return (0); else { free(sym->nam); free(sym->val); TAILQ_REMOVE(&symhead, sym, entries); free(sym); } } if ((sym = calloc(1, sizeof(*sym))) == NULL) return (-1); sym->nam = strdup(nam); if (sym->nam == NULL) { free(sym); return (-1); } sym->val = strdup(val); if (sym->val == NULL) { free(sym->nam); free(sym); return (-1); } sym->used = 0; sym->persist = persist; TAILQ_INSERT_TAIL(&symhead, sym, entries); return (0); } int cmdline_symset(char *s) { char *sym, *val; int ret; size_t len; if ((val = strrchr(s, '=')) == NULL) return (-1); len = strlen(s) - strlen(val) + 1; if ((sym = malloc(len)) == NULL) errx(1, "cmdline_symset: malloc"); strlcpy(sym, s, len); ret = symset(sym, val + 1, 1); free(sym); return (ret); } char * symget(const char *nam) { struct sym *sym; TAILQ_FOREACH(sym, &symhead, entries) if (strcmp(nam, sym->nam) == 0) { sym->used = 1; return (sym->val); } return (NULL); } int atoul(char *s, u_long *ulvalp) { u_long ulval; char *ep; errno = 0; ulval = strtoul(s, &ep, 0); if (s[0] == '\0' || *ep != '\0') return (-1); if (errno == ERANGE && ulval == ULONG_MAX) return (-1); *ulvalp = ulval; return (0); } struct iface * conf_get_if(struct kif *kif) { struct iface *i; LIST_FOREACH(i, &conf->iface_list, entry) if (i->ifindex == kif->ifindex) { yyerror("interface %s already configured", kif->ifname); return (NULL); } i = if_new(kif); i->auth_keyid = 1; i->passive = 0; return (i); } void clear_config(struct ripd_conf *xconf) { struct iface *i; while ((i = LIST_FIRST(&conf->iface_list)) != NULL) { LIST_REMOVE(i, entry); if_del(i); } free(xconf); }