/* $OpenBSD: parse.y,v 1.24 2013/04/21 04:33:41 deraadt Exp $ */ /* * Copyright (c) 2004, 2005, 2006 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 #include #include #include #include "igmp.h" #include "dvmrp.h" #include "dvmrpd.h" #include "dvmrpe.h" #include "log.h" TAILQ_HEAD(files, file) files = TAILQ_HEAD_INITIALIZER(files); static struct file { TAILQ_ENTRY(file) entry; FILE *stream; char *name; int lineno; int errors; } *file, *topfile; struct file *pushfile(const char *, int); int popfile(void); int check_file_secrecy(int, const char *); int yyparse(void); int yylex(void); int yyerror(const char *, ...); int kw_cmp(const void *, const void *); int lookup(char *); int lgetc(int); int lungetc(int); int findeol(void); TAILQ_HEAD(symhead, sym) symhead = TAILQ_HEAD_INITIALIZER(symhead); struct sym { TAILQ_ENTRY(sym) entry; int used; int persist; char *nam; char *val; }; int symset(const char *, const char *, int); char *symget(const char *); static struct dvmrpd_conf *conf; char *start_state; struct iface *iface = NULL; static struct { u_int32_t probe_interval; u_int32_t query_interval; u_int32_t query_resp_interval; u_int32_t startup_query_interval; u_int32_t startup_query_cnt; u_int32_t last_member_query_interval; u_int32_t last_member_query_cnt; u_int32_t dead_interval; u_int16_t metric; u_int8_t robustness; u_int8_t igmp_version; } *defs, *grdefs, globaldefs, groupdefs, ifacedefs; void clear_config(struct dvmrpd_conf *xconf); struct iface *conf_get_if(struct kif *); struct iface *new_group(void); typedef struct { union { int64_t number; char *string; } v; int lineno; } YYSTYPE; %} %token INTERFACE FIBUPDATE %token GROUP %token METRIC PASSIVE %token ROBUSTNESS QUERYINTERVAL QUERYRESPINTERVAL %token STARTUPQUERYINTERVAL STARTUPQUERYCNT %token LASTMEMBERQUERYINTERVAL LASTMEMBERQUERYCNT %token IGMPVERSION %token ERROR %token STRING %token NUMBER %type yesno %type string %% grammar : /* empty */ | grammar '\n' | grammar conf_main '\n' | grammar varset '\n' | grammar interface '\n' | grammar group '\n' | grammar error '\n' { file->errors++; } ; 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 { yyerror("syntax error, " "either yes or no expected"); free($1); YYERROR; } free($1); } ; varset : STRING '=' string { if (conf->opts & DVMRPD_OPT_VERBOSE) printf("%s = \"%s\"\n", $1, $3); if (symset($1, $3, 0) == -1) fatal("cannot store variable"); free($1); free($3); } ; conf_main : FIBUPDATE yesno { if ($2 == 0) conf->flags |= DVMRPD_FLAG_NO_FIB_UPDATE; else conf->flags &= ~DVMRPD_FLAG_NO_FIB_UPDATE; } | defaults ; defaults : LASTMEMBERQUERYCNT NUMBER { if ($2 < MIN_LAST_MEMBER_QUERY_CNT || $2 > MAX_LAST_MEMBER_QUERY_CNT) { yyerror("last-member-query-count out of " "range (%d-%d)", MIN_LAST_MEMBER_QUERY_CNT, MAX_LAST_MEMBER_QUERY_CNT); YYERROR; } defs->last_member_query_cnt = $2; } | LASTMEMBERQUERYINTERVAL NUMBER { if ($2 < MIN_LAST_MEMBER_QUERY_INTERVAL || $2 > MAX_LAST_MEMBER_QUERY_INTERVAL) { yyerror("last-member-query-interval out of " "range (%d-%d)", MIN_LAST_MEMBER_QUERY_INTERVAL, MAX_LAST_MEMBER_QUERY_INTERVAL); YYERROR; } defs->last_member_query_interval = $2; } | METRIC NUMBER { if ($2 < MIN_METRIC || $2 > MAX_METRIC) { yyerror("metric out of range (%d-%d)", MIN_METRIC, MAX_METRIC); YYERROR; } defs->metric = $2; } | QUERYINTERVAL NUMBER { if ($2 < MIN_QUERY_INTERVAL || $2 > MAX_QUERY_INTERVAL) { yyerror("query-interval out of range (%d-%d)", MIN_QUERY_INTERVAL, MAX_QUERY_INTERVAL); YYERROR; } defs->query_interval = $2; } | QUERYRESPINTERVAL NUMBER { if ($2 < MIN_QUERY_RESP_INTERVAL || $2 > MAX_QUERY_RESP_INTERVAL) { yyerror("query-response-interval out of " "range (%d-%d)", MIN_QUERY_RESP_INTERVAL, MAX_QUERY_RESP_INTERVAL); YYERROR; } defs->query_resp_interval = $2; } | ROBUSTNESS NUMBER { if ($2 < MIN_ROBUSTNESS || $2 > MAX_ROBUSTNESS) { yyerror("robustness out of range (%d-%d)", MIN_ROBUSTNESS, MAX_ROBUSTNESS); YYERROR; } defs->robustness = $2; } | STARTUPQUERYCNT NUMBER { if ($2 < MIN_STARTUP_QUERY_CNT || $2 > MAX_STARTUP_QUERY_CNT) { yyerror("startup-query-count out of " "range (%d-%d)", MIN_STARTUP_QUERY_CNT, MAX_STARTUP_QUERY_CNT); YYERROR; } defs->startup_query_cnt = $2; } | STARTUPQUERYINTERVAL NUMBER { if ($2 < MIN_STARTUP_QUERY_INTERVAL || $2 > MAX_STARTUP_QUERY_INTERVAL) { yyerror("startup-query-interval out of " "range (%d-%d)", MIN_STARTUP_QUERY_INTERVAL, MAX_STARTUP_QUERY_INTERVAL); YYERROR; } defs->startup_query_interval = $2; } | IGMPVERSION NUMBER { if ($2 < MIN_IGMP_VERSION || $2 > MAX_IGMP_VERSION) { yyerror("igmp-version out of range (%d-%d)", MIN_IGMP_VERSION, MAX_IGMP_VERSION); YYERROR; } defs->igmp_version = $2; } ; optnl : '\n' optnl | ; nl : '\n' optnl /* one newline or more */ ; 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)); defs = &ifacedefs; } interface_block { iface->probe_interval = defs->probe_interval; iface->query_interval = defs->query_interval; iface->query_resp_interval = defs->query_resp_interval; iface->startup_query_interval = defs->startup_query_interval; iface->startup_query_cnt = defs->startup_query_cnt; iface->last_member_query_interval = defs->last_member_query_interval; iface->last_member_query_cnt = defs->last_member_query_cnt; iface->dead_interval = defs->dead_interval; iface->metric = defs->metric; iface->robustness = defs->robustness; iface->igmp_version = defs->igmp_version; if (grdefs) defs = grdefs; else defs = &globaldefs; iface = NULL; } ; interface_block : '{' optnl interfaceopts_l '}' | '{' optnl '}' | ; interfaceopts_l : interfaceopts_l interfaceoptsl | interfaceoptsl ; interfaceoptsl : PASSIVE nl { iface->passive = 1; } | defaults nl ; group : GROUP optnl '{' optnl { memcpy(&groupdefs, defs, sizeof(groupdefs)); grdefs = defs = &groupdefs; } groupopts_l '}' { grdefs = NULL; defs = &globaldefs; } ; groupopts_l : groupopts_l groupoptsl | groupoptsl ; groupoptsl : interface nl | defaults nl | error nl ; %% struct keywords { const char *k_name; int k_val; }; int yyerror(const char *fmt, ...) { va_list ap; char *nfmt; file->errors++; va_start(ap, fmt); if (asprintf(&nfmt, "%s:%d: %s", file->name, yylval.lineno, fmt) == -1) fatalx("yyerror asprintf"); vlog(LOG_CRIT, nfmt, ap); va_end(ap); free(nfmt); 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[] = { {"fib-update", FIBUPDATE}, {"group", GROUP}, {"igmp-version", IGMPVERSION}, {"interface", INTERFACE}, {"last-member-query-count", LASTMEMBERQUERYCNT}, {"last-member-query-interval", LASTMEMBERQUERYINTERVAL}, {"metric", METRIC}, {"passive", PASSIVE}, {"query-interval", QUERYINTERVAL}, {"query-response-interval", QUERYRESPINTERVAL}, {"robustness", ROBUSTNESS}, {"startup-query-count", STARTUPQUERYCNT}, {"startup-query-interval", STARTUPQUERYINTERVAL} }; const struct keywords *p; p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]), sizeof(keywords[0]), kw_cmp); if (p) return (p->k_val); else return (STRING); } #define MAXPUSHBACK 128 char *parsebuf; int parseindex; char pushback_buffer[MAXPUSHBACK]; int pushback_index = 0; int lgetc(int quotec) { 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]); if (quotec) { if ((c = getc(file->stream)) == EOF) { yyerror("reached end of file while parsing " "quoted string"); if (file == topfile || popfile() == EOF) return (EOF); return (quotec); } return (c); } while ((c = getc(file->stream)) == '\\') { next = getc(file->stream); if (next != '\n') { c = next; break; } yylval.lineno = file->lineno; file->lineno++; } while (c == EOF) { if (file == topfile || popfile() == EOF) return (EOF); c = getc(file->stream); } 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; /* skip to either EOF or the first real EOL */ while (1) { if (pushback_index) c = pushback_buffer[--pushback_index]; else c = lgetc(0); if (c == '\n') { file->lineno++; break; } if (c == EOF) break; } return (ERROR); } int yylex(void) { char buf[8096]; char *p, *val; int quotec, next, c; int token; top: p = buf; while ((c = lgetc(0)) == ' ' || c == '\t') ; /* nothing */ yylval.lineno = file->lineno; if (c == '#') while ((c = lgetc(0)) != '\n' && c != EOF) ; /* nothing */ if (c == '$' && parsebuf == NULL) { while (1) { if ((c = lgetc(0)) == 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 '"': quotec = c; while (1) { if ((c = lgetc(quotec)) == EOF) return (0); if (c == '\n') { file->lineno++; continue; } else if (c == '\\') { if ((next = lgetc(quotec)) == EOF) return (0); if (next == quotec || c == ' ' || c == '\t') c = next; else if (next == '\n') { file->lineno++; continue; } else lungetc(next); } else if (c == quotec) { *p = '\0'; break; } 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) err(1, "yylex: strdup"); return (STRING); } #define allowed_to_end_number(x) \ (isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=') if (c == '-' || isdigit(c)) { do { *p++ = c; if ((unsigned)(p-buf) >= sizeof(buf)) { yyerror("string too long"); return (findeol()); } } while ((c = lgetc(0)) != EOF && isdigit(c)); lungetc(c); if (p == buf + 1 && buf[0] == '-') goto nodigits; if (c == EOF || allowed_to_end_number(c)) { const char *errstr = NULL; *p = '\0'; yylval.v.number = strtonum(buf, LLONG_MIN, LLONG_MAX, &errstr); if (errstr) { yyerror("\"%s\" invalid number: %s", buf, errstr); return (findeol()); } return (NUMBER); } else { nodigits: while (p > buf + 1) lungetc(*--p); c = *--p; if (c == '-') return (c); } } #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(0)) != 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 = file->lineno; file->lineno++; } if (c == EOF) return (0); return (c); } int check_file_secrecy(int fd, const char *fname) { struct stat st; if (fstat(fd, &st)) { log_warn("cannot stat %s", fname); return (-1); } if (st.st_uid != 0 && st.st_uid != getuid()) { log_warnx("%s: owner not root or current user", fname); return (-1); } if (st.st_mode & (S_IRWXG | S_IRWXO)) { log_warnx("%s: group/world readable/writeable", fname); return (-1); } return (0); } struct file * pushfile(const char *name, int secret) { struct file *nfile; if ((nfile = calloc(1, sizeof(struct file))) == NULL) { log_warn("malloc"); return (NULL); } if ((nfile->name = strdup(name)) == NULL) { log_warn("malloc"); free(nfile); return (NULL); } if ((nfile->stream = fopen(nfile->name, "r")) == NULL) { log_warn("%s", nfile->name); free(nfile->name); free(nfile); return (NULL); } else if (secret && check_file_secrecy(fileno(nfile->stream), nfile->name)) { fclose(nfile->stream); free(nfile->name); free(nfile); return (NULL); } nfile->lineno = 1; TAILQ_INSERT_TAIL(&files, nfile, entry); return (nfile); } int popfile(void) { struct file *prev; if ((prev = TAILQ_PREV(file, files, entry)) != NULL) prev->errors += file->errors; TAILQ_REMOVE(&files, file, entry); fclose(file->stream); free(file->name); free(file); file = prev; return (file ? 0 : EOF); } struct dvmrpd_conf * parse_config(char *filename, int opts) { int errors = 0; struct sym *sym, *next; struct timeval now; if ((conf = calloc(1, sizeof(struct dvmrpd_conf))) == NULL) { errx(1, "parse_config calloc"); return (NULL); } defs = &globaldefs; defs->probe_interval = DEFAULT_PROBE_INTERVAL; defs->last_member_query_cnt = DEFAULT_LAST_MEMBER_QUERY_CNT; defs->last_member_query_interval = DEFAULT_LAST_MEMBER_QUERY_INTERVAL; defs->metric = DEFAULT_METRIC; defs->query_interval = DEFAULT_QUERY_INTERVAL; defs->query_resp_interval = DEFAULT_QUERY_RESP_INTERVAL; defs->robustness = DEFAULT_ROBUSTNESS; defs->startup_query_cnt = DEFAULT_STARTUP_QUERY_CNT; defs->startup_query_interval = DEFAULT_STARTUP_QUERY_INTERVAL; defs->igmp_version = DEFAULT_IGMP_VERSION; defs->dead_interval = NBR_TMOUT; if ((file = pushfile(filename, 1)) == NULL) { free(conf); return (NULL); } topfile = file; gettimeofday(&now, NULL); conf->gen_id = (u_int32_t)now.tv_sec; /* for a while after 2038 */ conf->opts = opts; yyparse(); errors = file->errors; popfile(); /* Free macros and check which have not been used. */ for (sym = TAILQ_FIRST(&symhead); sym != NULL; sym = next) { next = TAILQ_NEXT(sym, entry); if ((conf->opts & DVMRPD_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, entry); free(sym); } } 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, entry)) ; /* nothing */ if (sym != NULL) { if (sym->persist == 1) return (0); else { free(sym->nam); free(sym->val); TAILQ_REMOVE(&symhead, sym, entry); 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, entry); 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, entry) if (strcmp(nam, sym->nam) == 0) { sym->used = 1; return (sym->val); } return (NULL); } struct iface * conf_get_if(struct kif *kif) { struct iface *i; if (kif->ifindex >= MAXVIFS) { yyerror("interface %s index too large", kif->ifname); return (NULL); } 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->passive = 0; i->recv_query_resp_interval = DEFAULT_QUERY_RESP_INTERVAL; return (i); } void clear_config(struct dvmrpd_conf *xconf) { /* XXX clear conf */ /* ... */ }