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-rw-r--r--sbin/dhcpleased/parse.y804
1 files changed, 804 insertions, 0 deletions
diff --git a/sbin/dhcpleased/parse.y b/sbin/dhcpleased/parse.y
new file mode 100644
index 00000000000..21b2383a44c
--- /dev/null
+++ b/sbin/dhcpleased/parse.y
@@ -0,0 +1,804 @@
+/* $OpenBSD: parse.y,v 1.1 2021/07/26 09:26:36 florian Exp $ */
+
+/*
+ * Copyright (c) 2018 Florian Obser <florian@openbsd.org>
+ * Copyright (c) 2004, 2005 Esben Norby <norby@openbsd.org>
+ * Copyright (c) 2004 Ryan McBride <mcbride@openbsd.org>
+ * Copyright (c) 2002, 2003, 2004 Henning Brauer <henning@openbsd.org>
+ * 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 <sys/types.h>
+#include <sys/queue.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+
+#include <net/if.h>
+
+#include <netinet/in.h>
+#include <netinet/if_ether.h>
+
+#include <arpa/inet.h>
+
+#include <ctype.h>
+#include <err.h>
+#include <errno.h>
+#include <event.h>
+#include <imsg.h>
+#include <limits.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+#include <syslog.h>
+#include <unistd.h>
+#include <vis.h>
+
+#include "log.h"
+#include "dhcpleased.h"
+#include "frontend.h"
+
+TAILQ_HEAD(files, file) files = TAILQ_HEAD_INITIALIZER(files);
+static struct file {
+ TAILQ_ENTRY(file) entry;
+ FILE *stream;
+ char *name;
+ size_t ungetpos;
+ size_t ungetsize;
+ u_char *ungetbuf;
+ int eof_reached;
+ 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 *, ...)
+ __attribute__((__format__ (printf, 1, 2)))
+ __attribute__((__nonnull__ (1)));
+int kw_cmp(const void *, const void *);
+int lookup(char *);
+int igetc(void);
+int lgetc(int);
+void 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 dhcpleased_conf *conf;
+static int errors;
+
+static struct iface_conf *iface_conf;
+
+struct iface_conf *conf_get_iface(char *);
+
+typedef struct {
+ union {
+ int64_t number;
+ char *string;
+ } v;
+ int lineno;
+} YYSTYPE;
+
+%}
+
+%token DHCP_IFACE ERROR SEND VENDOR CLASS ID CLIENT
+
+%token <v.string> STRING
+%token <v.number> NUMBER
+%type <v.string> string
+
+%%
+
+grammar : /* empty */
+ | grammar '\n'
+ | grammar varset '\n'
+ | grammar dhcp_iface '\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
+ ;
+
+varset : STRING '=' string {
+ char *s = $1;
+ if (log_getverbose() == 1)
+ printf("%s = \"%s\"\n", $1, $3);
+ while (*s++) {
+ if (isspace((unsigned char)*s)) {
+ yyerror("macro name cannot contain "
+ "whitespace");
+ free($1);
+ free($3);
+ YYERROR;
+ }
+ }
+ if (symset($1, $3, 0) == -1)
+ fatal("cannot store variable");
+ free($1);
+ free($3);
+ }
+ ;
+
+optnl : '\n' optnl /* zero or more newlines */
+ | /*empty*/
+ ;
+
+nl : '\n' optnl /* one or more newlines */
+ ;
+
+dhcp_iface : DHCP_IFACE STRING {
+ iface_conf = conf_get_iface($2);
+ } iface_block {
+ iface_conf = NULL;
+ }
+ ;
+
+iface_block : '{' optnl ifaceopts_l '}'
+ | '{' optnl '}'
+ | /* empty */
+ ;
+
+ifaceopts_l : ifaceopts_l ifaceoptsl nl
+ | ifaceoptsl optnl
+ ;
+
+ifaceoptsl : SEND VENDOR CLASS ID STRING {
+ ssize_t len;
+ char buf[256];
+
+ if (iface_conf->vc_id != NULL) {
+ yyerror("vendor class id already set");
+ YYERROR;
+ }
+
+ len = strnunvis(buf, $5, sizeof(buf));
+ free($5);
+
+ if (len == -1) {
+ yyerror("invalid vendor class id");
+ YYERROR;
+ }
+ if ((size_t)len >= sizeof(buf)) {
+ yyerror("vendor class id too long");
+ YYERROR;
+ }
+
+ iface_conf->vc_id_len = 2 + strlen(buf);
+ iface_conf->vc_id = malloc(iface_conf->vc_id_len);
+ if (iface_conf->vc_id == NULL) {
+ yyerror("malloc");
+ YYERROR;
+ }
+ iface_conf->vc_id[0] = DHO_DHCP_CLASS_IDENTIFIER;
+ iface_conf->vc_id[1] = iface_conf->vc_id_len - 2;
+ memcpy(&iface_conf->vc_id[2], buf,
+ iface_conf->vc_id_len - 2);
+ }
+ | SEND CLIENT ID STRING {
+ size_t i;
+ ssize_t len;
+ int not_hex = 0, val;
+ char buf[256], *hex, *p, excess;
+
+ if (iface_conf->c_id != NULL) {
+ yyerror("client-id already set");
+ YYERROR;
+ }
+
+ /* parse as hex string including the type byte */
+ if ((hex = strdup($4)) == NULL) {
+ free($4);
+ yyerror("malloc");
+ YYERROR;
+ }
+ for (i = 0; (p = strsep(&hex, ":")) != NULL && i <
+ sizeof(buf); ) {
+ if (sscanf(p, "%x%c", &val, &excess) != 1 ||
+ val < 0 || val > 0xff) {
+ not_hex = 1;
+ break;
+ }
+ buf[i++] = (val & 0xff);
+ }
+ if (p != NULL && i == sizeof(buf))
+ not_hex = 1;
+ free(hex);
+
+ if (not_hex) {
+ len = strnunvis(buf, $4, sizeof(buf));
+ free($4);
+
+ if (len == -1) {
+ yyerror("invalid client-id");
+ YYERROR;
+ }
+ if ((size_t)len >= sizeof(buf)) {
+ yyerror("client-id too long");
+ YYERROR;
+ }
+ iface_conf->c_id_len = 3 + strlen(buf);
+ iface_conf->c_id = malloc(iface_conf->c_id_len);
+ if (iface_conf->c_id == NULL) {
+ yyerror("malloc");
+ YYERROR;
+ }
+ iface_conf->c_id[2] = HTYPE_NONE;
+ memcpy(&iface_conf->c_id[3], buf,
+ iface_conf->c_id_len - 3);
+ } else {
+ free($4);
+ iface_conf->c_id_len = 2 + i;
+ iface_conf->c_id = malloc(iface_conf->c_id_len);
+ if (iface_conf->c_id == NULL) {
+ yyerror("malloc");
+ YYERROR;
+ }
+ memcpy(&iface_conf->c_id[2], buf,
+ iface_conf->c_id_len - 2);
+ }
+ iface_conf->c_id[0] = DHO_DHCP_CLIENT_IDENTIFIER;
+ iface_conf->c_id[1] = iface_conf->c_id_len - 2;
+ }
+ ;
+%%
+
+struct keywords {
+ const char *k_name;
+ int k_val;
+};
+
+int
+yyerror(const char *fmt, ...)
+{
+ va_list ap;
+ char *msg;
+
+ file->errors++;
+ va_start(ap, fmt);
+ if (vasprintf(&msg, fmt, ap) == -1)
+ fatalx("yyerror vasprintf");
+ va_end(ap);
+ logit(LOG_CRIT, "%s:%d: %s", file->name, yylval.lineno, msg);
+ free(msg);
+ 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[] = {
+ {"class", CLASS},
+ {"client", CLIENT},
+ {"id", ID},
+ {"interface", DHCP_IFACE},
+ {"send", SEND},
+ {"vendor", VENDOR},
+ };
+ 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 START_EXPAND 1
+#define DONE_EXPAND 2
+
+static int expanding;
+
+int
+igetc(void)
+{
+ int c;
+
+ while (1) {
+ if (file->ungetpos > 0)
+ c = file->ungetbuf[--file->ungetpos];
+ else
+ c = getc(file->stream);
+
+ if (c == START_EXPAND)
+ expanding = 1;
+ else if (c == DONE_EXPAND)
+ expanding = 0;
+ else
+ break;
+ }
+ return (c);
+}
+
+int
+lgetc(int quotec)
+{
+ int c, next;
+
+ if (quotec) {
+ if ((c = igetc()) == EOF) {
+ yyerror("reached end of file while parsing "
+ "quoted string");
+ if (file == topfile || popfile() == EOF)
+ return (EOF);
+ return (quotec);
+ }
+ return (c);
+ }
+
+ while ((c = igetc()) == '\\') {
+ next = igetc();
+ if (next != '\n') {
+ c = next;
+ break;
+ }
+ yylval.lineno = file->lineno;
+ file->lineno++;
+ }
+
+ if (c == EOF) {
+ /*
+ * Fake EOL when hit EOF for the first time. This gets line
+ * count right if last line in included file is syntactically
+ * invalid and has no newline.
+ */
+ if (file->eof_reached == 0) {
+ file->eof_reached = 1;
+ return ('\n');
+ }
+ while (c == EOF) {
+ if (file == topfile || popfile() == EOF)
+ return (EOF);
+ c = igetc();
+ }
+ }
+ return (c);
+}
+
+void
+lungetc(int c)
+{
+ if (c == EOF)
+ return;
+
+ if (file->ungetpos >= file->ungetsize) {
+ void *p = reallocarray(file->ungetbuf, file->ungetsize, 2);
+ if (p == NULL)
+ err(1, "lungetc");
+ file->ungetbuf = p;
+ file->ungetsize *= 2;
+ }
+ file->ungetbuf[file->ungetpos++] = c;
+}
+
+int
+findeol(void)
+{
+ int c;
+
+ /* Skip to either EOF or the first real EOL. */
+ while (1) {
+ c = lgetc(0);
+ if (c == '\n') {
+ file->lineno++;
+ break;
+ }
+ if (c == EOF)
+ break;
+ }
+ return (ERROR);
+}
+
+int
+yylex(void)
+{
+ unsigned char buf[8096];
+ unsigned 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 == '$' && !expanding) {
+ 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++ = c;
+ continue;
+ }
+ *p = '\0';
+ lungetc(c);
+ break;
+ }
+ val = symget(buf);
+ if (val == NULL) {
+ yyerror("macro '%s' not defined", buf);
+ return (findeol());
+ }
+ p = val + strlen(val) - 1;
+ lungetc(DONE_EXPAND);
+ while (p >= val) {
+ lungetc(*p);
+ p--;
+ }
+ lungetc(START_EXPAND);
+ 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 || next == ' ' ||
+ next == '\t')
+ c = next;
+ else if (next == '\n') {
+ file->lineno++;
+ continue;
+ } else
+ lungetc(next);
+ } else if (c == quotec) {
+ *p = '\0';
+ break;
+ } else if (c == '\0') {
+ yyerror("syntax error");
+ return (findeol());
+ }
+ if (p + 1 >= buf + sizeof(buf) - 1) {
+ yyerror("string too long");
+ return (findeol());
+ }
+ *p++ = 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 ((size_t)(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 ((size_t)(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_IWGRP | S_IXGRP | S_IRWXO)) {
+ log_warnx("%s: group writable or world read/writable", 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("calloc");
+ return (NULL);
+ }
+ if ((nfile->name = strdup(name)) == NULL) {
+ log_warn("strdup");
+ free(nfile);
+ return (NULL);
+ }
+ if ((nfile->stream = fopen(nfile->name, "r")) == NULL) {
+ 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 = TAILQ_EMPTY(&files) ? 1 : 0;
+ nfile->ungetsize = 16;
+ nfile->ungetbuf = malloc(nfile->ungetsize);
+ if (nfile->ungetbuf == NULL) {
+ log_warn("malloc");
+ fclose(nfile->stream);
+ free(nfile->name);
+ free(nfile);
+ return (NULL);
+ }
+ 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->ungetbuf);
+ free(file);
+ file = prev;
+ return (file ? 0 : EOF);
+}
+
+struct dhcpleased_conf *
+parse_config(char *filename)
+{
+ struct sym *sym, *next;
+
+ conf = config_new_empty();
+
+ file = pushfile(filename != NULL ? filename : _PATH_CONF_FILE, 0);
+ if (file == NULL) {
+ /* no default config file is fine */
+ if (errno == ENOENT && filename == NULL)
+ return (conf);
+ log_warn("%s", filename);
+ free(conf);
+ return (NULL);
+ }
+ topfile = file;
+
+ yyparse();
+ errors = file->errors;
+ popfile();
+
+ /* Free macros and check which have not been used. */
+ TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
+ if ((log_getverbose() == 2) && !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) {
+ config_clear(conf);
+ return (NULL);
+ }
+
+ return (conf);
+}
+
+int
+symset(const char *nam, const char *val, int persist)
+{
+ struct sym *sym;
+
+ TAILQ_FOREACH(sym, &symhead, entry) {
+ if (strcmp(nam, sym->nam) == 0)
+ break;
+ }
+
+ 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;
+
+ if ((val = strrchr(s, '=')) == NULL)
+ return (-1);
+ sym = strndup(s, val - s);
+ if (sym == NULL)
+ errx(1, "%s: strndup", __func__);
+ 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 *
+conf_get_iface(char *name)
+{
+ struct iface_conf *iface;
+ size_t n;
+
+ SIMPLEQ_FOREACH(iface, &conf->iface_list, entry) {
+ if (strcmp(name, iface->name) == 0)
+ return (iface);
+ }
+
+ iface = calloc(1, sizeof(*iface));
+ if (iface == NULL)
+ errx(1, "%s: calloc", __func__);
+ n = strlcpy(iface->name, name, sizeof(iface->name));
+ if (n >= sizeof(iface->name))
+ errx(1, "%s: name too long", __func__);
+
+
+ SIMPLEQ_INSERT_TAIL(&conf->iface_list, iface, entry);
+
+ return (iface);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-27 22:18:51 +0000