/
parse.y
1352 lines (1195 loc) · 26.7 KB
/
parse.y
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%{
/*
* Copyright (c) 2021-2024 Omar Polo <[email protected]>
* Copyright (c) 2018 Florian Obser <[email protected]>
* Copyright (c) 2004, 2005 Esben Norby <[email protected]>
* Copyright (c) 2004 Ryan McBride <[email protected]>
* Copyright (c) 2002, 2003, 2004 Henning Brauer <[email protected]>
* 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 "gmid.h"
#include <ctype.h>
#include <errno.h>
#include <netdb.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include "log.h"
struct conf *conf;
static const char *default_host = NULL;
static uint16_t default_port = 1965;
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 yyparse(void);
int yylex(void);
void yyerror(const char *, ...)
__attribute__((__format__ (printf, 1, 2)))
__attribute__((__nonnull__ (1)));
void yywarn(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);
/*
* #define YYDEBUG 1
* int yydebug = 1;
*/
TAILQ_HEAD(symhead, sym) symhead = TAILQ_HEAD_INITIALIZER(symhead);
struct sym {
TAILQ_ENTRY(sym) entry;
int used;
int persist;
char *name;
char *val;
};
int symset(const char *, const char *, int);
char *symget(const char *);
char *ensure_absolute_path(char*);
int check_block_code(int);
char *check_block_fmt(char*);
int check_strip_no(int);
int check_prefork_num(int);
void advance_loc(void);
void advance_proxy(void);
int fastcgi_conf(const char *, const char *);
void add_param(char *, char *);
int getservice(const char *);
void listen_on(const char *, const char *);
static struct vhost *host;
static struct location *loc;
static struct proxy *proxy;
static char *current_media;
static int errors;
typedef struct {
union {
char *string;
int number;
} v;
int lineno;
} YYSTYPE;
#define YYSTYPE YYSTYPE
%}
/* for bison: */
/* %define parse.error verbose */
%token ACCESS ALIAS AUTO
%token BLOCK
%token CA CERT CHROOT CLIENT
%token DEFAULT
%token FACILITY FASTCGI FOR_HOST
%token INCLUDE INDEX IPV6
%token KEY
%token LANG LISTEN LOCATION LOG
%token OCSP OFF ON
%token PARAM PORT PREFORK PROTO PROTOCOLS PROXY
%token RELAY_TO REQUIRE RETURN ROOT
%token SERVER SNI SOCKET STRIP STYLE SYSLOG
%token TCP TOEXT TYPE TYPES
%token USE_TLS USER
%token VERIFYNAME
%token ERROR
%token <v.string> STRING
%token <v.number> NUM
%type <v.number> bool proxy_port
%type <v.string> string numberstring listen_addr
%%
conf : /* empty */
| conf include nl
| conf varset nl
| conf option nl
| conf vhost nl
| conf types nl
| conf error nl { file->errors++; }
;
include : INCLUDE STRING {
struct file *nfile;
if ((nfile = pushfile($2, 0)) == NULL) {
yyerror("failed to include file %s", $2);
free($2);
YYERROR;
}
free($2);
file = nfile;
lungetc('\n');
}
;
bool : ON { $$ = 1; }
| OFF { $$ = 0; }
;
string : string STRING {
if (asprintf(&$$, "%s%s", $1, $2) == -1) {
free($1);
free($2);
yyerror("string: asprintf: %s", strerror(errno));
YYERROR;
}
free($1);
free($2);
}
| STRING
;
numberstring : NUM {
char *s;
if (asprintf(&s, "%d", $1) == -1) {
yyerror("asprintf: number");
YYERROR;
}
$$ = s;
}
| STRING
;
varset : STRING '=' string {
char *s = $1;
while (*s++) {
if (isspace((unsigned char)*s)) {
yyerror("macro name cannot contain "
"whitespaces");
free($1);
free($3);
YYERROR;
}
}
symset($1, $3, 0);
free($1);
free($3);
}
;
option : CHROOT string {
if (strlcpy(conf->chroot, $2, sizeof(conf->chroot)) >=
sizeof(conf->chroot))
yyerror("chroot path too long");
free($2);
}
| IPV6 bool {
yywarn("option `ipv6' is deprecated,"
" please use `listen on'");
if ($2)
default_host = NULL;
else
default_host = "0.0.0.0";
}
| log
| PORT NUM {
yywarn("option `port' is deprecated,"
" please use `listen on'");
default_port = $2;
}
| PREFORK NUM { conf->prefork = check_prefork_num($2); }
| PROTOCOLS string {
if (tls_config_parse_protocols(&conf->protos, $2) == -1)
yyerror("invalid protocols string \"%s\"", $2);
free($2);
}
| USER string {
if (strlcpy(conf->user, $2, sizeof(conf->user)) >=
sizeof(conf->user))
yyerror("user name too long");
free($2);
}
;
log : LOG '{' optnl logopts '}'
| LOG logopt
;
logopts : /* empty */
| logopts logopt optnl
;
logopt : ACCESS string {
free(conf->log_access);
conf->log_access = $2;
}
| STYLE string {
if (!strcmp("combined", $2))
conf->log_format = LOG_FORMAT_COMBINED;
else if (!strcmp("common", $2))
conf->log_format = LOG_FORMAT_COMMON;
else if (!strcmp("condensed", $2))
conf->log_format = LOG_FORMAT_CONDENSED;
else if (!strcmp("legacy", $2))
conf->log_format = LOG_FORMAT_LEGACY;
else
yyerror("unknown log style: %s", $2);
free($2);
}
| SYSLOG FACILITY string {
const char *str = $3;
conf->log_syslog = 1;
if (!strncasecmp(str, "LOG_", 4))
str += 4;
if (!strcasecmp(str, "daemon"))
conf->log_facility = LOG_DAEMON;
#ifdef LOG_FTP
else if (!strcasecmp(str, "ftp"))
conf->log_facility = LOG_FTP;
#endif
else if (!strcasecmp(str, "local1"))
conf->log_facility = LOG_LOCAL1;
else if (!strcasecmp(str, "local2"))
conf->log_facility = LOG_LOCAL2;
else if (!strcasecmp(str, "local3"))
conf->log_facility = LOG_LOCAL3;
else if (!strcasecmp(str, "local4"))
conf->log_facility = LOG_LOCAL4;
else if (!strcasecmp(str, "local5"))
conf->log_facility = LOG_LOCAL5;
else if (!strcasecmp(str, "local6"))
conf->log_facility = LOG_LOCAL6;
else if (!strcasecmp(str, "local7"))
conf->log_facility = LOG_LOCAL7;
else if (!strcasecmp(str, "user"))
conf->log_facility = LOG_USER;
else
yywarn("unknown syslog facility `%s'",
$3);
free($3);
}
| SYSLOG OFF {
conf->log_syslog = 0;
}
| SYSLOG {
conf->log_syslog = 1;
}
;
vhost : SERVER string {
host = new_vhost();
TAILQ_INSERT_HEAD(&conf->hosts, host, vhosts);
loc = new_location();
TAILQ_INSERT_HEAD(&host->locations, loc, locations);
TAILQ_INIT(&host->proxies);
(void) strlcpy(loc->match, "*", sizeof(loc->match));
(void) strlcpy(host->domain, $2, sizeof(host->domain));
if (strstr($2, "xn--") != NULL) {
yywarn("\"%s\" looks like punycode: you "
"should use the decoded hostname", $2);
}
free($2);
} '{' optnl servbody '}' {
if (host->cert_path == NULL ||
host->key_path == NULL)
yyerror("invalid vhost definition: %s",
host->domain);
if (TAILQ_EMPTY(&host->addrs)) {
char portno[32];
int r;
r = snprintf(portno, sizeof(portno), "%d",
default_port);
if (r < 0 || (size_t)r >= sizeof(portno))
fatal("snprintf");
yywarn("missing `listen on' in server %s,"
" assuming %s port %d", host->domain,
default_host ? default_host : "*",
default_port);
listen_on(default_host, portno);
}
}
| error '}' { yyerror("bad server directive"); }
;
servbody : /* empty */
| servbody servopt optnl
| servbody location optnl
| servbody proxy optnl
;
listen_addr : '*' { $$ = NULL; }
| STRING
;
servopt : ALIAS string {
struct alist *a;
a = xcalloc(1, sizeof(*a));
(void) strlcpy(a->alias, $2, sizeof(a->alias));
free($2);
TAILQ_INSERT_TAIL(&host->aliases, a, aliases);
}
| CERT string {
ensure_absolute_path($2);
free(host->cert_path);
host->cert_path = $2;
}
| KEY string {
ensure_absolute_path($2);
free(host->key_path);
host->key_path = $2;
}
| OCSP string {
ensure_absolute_path($2);
free(host->ocsp_path);
host->ocsp_path = $2;
}
| PARAM string '=' string {
yywarn("the top-level `param' directive is deprecated."
" Please use `fastcgi { param ... }`");
add_param($2, $4);
}
| LISTEN ON listen_addr {
listen_on($3, "1965");
free($3);
}
| LISTEN ON listen_addr PORT STRING {
listen_on($3, $5);
free($3);
free($5);
}
| LISTEN ON listen_addr PORT NUM {
char portno[32];
int r;
r = snprintf(portno, sizeof(portno), "%d", $5);
if (r < 0 || (size_t)r >= sizeof(portno))
fatal("snprintf");
listen_on($3, portno);
free($3);
}
| locopt
;
proxy : PROXY { advance_proxy(); }
proxy_matches '{' optnl proxy_opts '}' {
if (*proxy->host == '\0')
yyerror("invalid proxy block: missing `relay-to' option");
if ((proxy->cert_path == NULL && proxy->key_path != NULL) ||
(proxy->cert_path != NULL && proxy->key_path == NULL))
yyerror("invalid proxy block: missing cert or key");
}
;
proxy_matches : /* empty */
| proxy_matches proxy_match
;
proxy_port : /* empty */ { $$ = 1965; }
| PORT STRING {
if (($$ = getservice($2)) == -1)
yyerror("invalid port number %s", $2);
free($2);
}
| PORT NUM { $$ = $2; }
;
proxy_match : PROTO string {
(void) strlcpy(proxy->match_proto, $2, sizeof(proxy->match_proto));
free($2);
}
| FOR_HOST string proxy_port {
(void) strlcpy(proxy->match_host, $2, sizeof(proxy->match_host));
(void) snprintf(proxy->match_port, sizeof(proxy->match_port),
"%d", $3);
free($2);
}
;
proxy_opts : /* empty */
| proxy_opts proxy_opt optnl
;
proxy_opt : CERT string {
free(proxy->cert);
ensure_absolute_path($2);
proxy->cert_path = $2;
}
| KEY string {
free(proxy->key);
ensure_absolute_path($2);
proxy->key_path = $2;
}
| PROTOCOLS string {
if (tls_config_parse_protocols(&proxy->protocols, $2) == -1)
yyerror("invalid protocols string \"%s\"", $2);
free($2);
}
| RELAY_TO string proxy_port {
(void) strlcpy(proxy->host, $2, sizeof(proxy->host));
(void) snprintf(proxy->port, sizeof(proxy->port),
"%d", $3);
free($2);
}
| REQUIRE CLIENT CA string {
ensure_absolute_path($4);
proxy->reqca_path = $4;
}
| SNI string {
(void) strlcpy(proxy->sni, $2, sizeof(proxy->sni));
free($2);
}
| USE_TLS bool {
proxy->notls = !$2;
}
| VERIFYNAME bool {
proxy->noverifyname = !$2;
}
;
location : LOCATION { advance_loc(); } string '{' optnl locopts '}' {
/* drop the starting '/' if any */
if (*$3 == '/')
memmove($3, $3+1, strlen($3));
(void) strlcpy(loc->match, $3, sizeof(loc->match));
free($3);
}
| error '}'
;
locopts : /* empty */
| locopts locopt optnl
;
locopt : AUTO INDEX bool { loc->auto_index = $3 ? 1 : -1; }
| BLOCK RETURN NUM string {
check_block_fmt($4);
(void) strlcpy(loc->block_fmt, $4, sizeof(loc->block_fmt));
loc->block_code = check_block_code($3);
free($4);
}
| BLOCK RETURN NUM {
(void) strlcpy(loc->block_fmt, "temporary failure",
sizeof(loc->block_fmt));
loc->block_code = check_block_code($3);
if ($3 >= 30 && $3 < 40)
yyerror("missing `meta' for block return %d", $3);
}
| BLOCK {
(void) strlcpy(loc->block_fmt, "temporary failure",
sizeof(loc->block_fmt));
loc->block_code = 40;
}
| DEFAULT TYPE string {
(void) strlcpy(loc->default_mime, $3,
sizeof(loc->default_mime));
free($3);
}
| fastcgi
| INDEX string {
(void) strlcpy(loc->index, $2, sizeof(loc->index));
free($2);
}
| LANG string {
(void) strlcpy(loc->lang, $2,
sizeof(loc->lang));
free($2);
}
| LOG bool { loc->disable_log = !$2; }
| REQUIRE CLIENT CA string {
ensure_absolute_path($4);
loc->reqca_path = $4;
}
| ROOT string {
(void) strlcpy(loc->dir, $2, sizeof(loc->dir));
free($2);
}
| STRIP NUM { loc->strip = check_strip_no($2); }
;
fastcgi : FASTCGI '{' optnl fastcgiopts '}'
| FASTCGI fastcgiopt
| FASTCGI OFF {
loc->fcgi = -1;
loc->nofcgi = 1;
}
| FASTCGI string {
yywarn("`fastcgi path' is deprecated. "
"Please use `fastcgi socket path' instead.");
loc->fcgi = fastcgi_conf($2, NULL);
free($2);
}
;
fastcgiopts : /* empty */
| fastcgiopts fastcgiopt optnl
;
fastcgiopt : PARAM string '=' string {
add_param($2, $4);
}
| SOCKET string {
loc->fcgi = fastcgi_conf($2, NULL);
free($2);
}
| SOCKET TCP string PORT NUM {
char *c;
if (asprintf(&c, "%d", $5) == -1)
fatal("asprintf");
loc->fcgi = fastcgi_conf($3, c);
free($3);
free(c);
}
| SOCKET TCP string {
loc->fcgi = fastcgi_conf($3, "9000");
}
| SOCKET TCP string PORT string {
loc->fcgi = fastcgi_conf($3, $5);
free($3);
free($5);
}
| STRIP NUM {
loc->fcgi_strip = $2;
}
;
types : TYPES '{' optnl mediaopts_l '}' ;
mediaopts_l : mediaopts_l mediaoptsl nl
| mediaoptsl nl
;
mediaoptsl : STRING {
free(current_media);
current_media = $1;
} medianames_l
| include
;
medianames_l : medianames_l medianamesl
| medianamesl
;
medianamesl : numberstring {
if (add_mime(&conf->mime, current_media, $1) == -1)
fatal("add_mime");
free($1);
}
;
nl : '\n' optnl
| ';' optnl
;
optnl : nl
| /*empty*/
;
%%
static const struct keyword {
const char *word;
int token;
} keywords[] = {
/* these MUST be sorted */
{"access", ACCESS},
{"alias", ALIAS},
{"auto", AUTO},
{"block", BLOCK},
{"ca", CA},
{"cert", CERT},
{"chroot", CHROOT},
{"client", CLIENT},
{"default", DEFAULT},
{"facility", FACILITY},
{"fastcgi", FASTCGI},
{"for-host", FOR_HOST},
{"include", INCLUDE},
{"index", INDEX},
{"ipv6", IPV6},
{"key", KEY},
{"lang", LANG},
{"listen", LISTEN},
{"location", LOCATION},
{"log", LOG},
{"ocsp", OCSP},
{"off", OFF},
{"on", ON},
{"param", PARAM},
{"port", PORT},
{"prefork", PREFORK},
{"proto", PROTO},
{"protocols", PROTOCOLS},
{"proxy", PROXY},
{"relay-to", RELAY_TO},
{"require", REQUIRE},
{"return", RETURN},
{"root", ROOT},
{"server", SERVER},
{"sni", SNI},
{"socket", SOCKET},
{"strip", STRIP},
{"style", STYLE},
{"syslog", SYSLOG},
{"tcp", TCP},
{"to-ext", TOEXT},
{"type", TYPE},
{"types", TYPES},
{"use-tls", USE_TLS},
{"user", USER},
{"verifyname", VERIFYNAME},
};
void
yyerror(const char *msg, ...)
{
va_list ap;
file->errors++;
va_start(ap, msg);
fprintf(stderr, "%s:%d error: ", config_path, yylval.lineno);
vfprintf(stderr, msg, ap);
fprintf(stderr, "\n");
va_end(ap);
}
void
yywarn(const char *msg, ...)
{
va_list ap;
va_start(ap, msg);
fprintf(stderr, "%s:%d warning: ", config_path, yylval.lineno);
vfprintf(stderr, msg, ap);
fprintf(stderr, "\n");
va_end(ap);
}
int
kw_cmp(const void *k, const void *e)
{
return strcmp(k, ((struct keyword *)e)->word);
}
int
lookup(char *s)
{
const struct keyword *p;
p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
sizeof(keywords[0]), kw_cmp);
if (p)
return p->token;
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)
fatal("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)
{
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 == '$' && !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();
}
yylval.v.string = xstrdup(val);
return STRING;
}
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("invalid syntax");
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)
fatal("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 NUM;
} 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 != ',' && x != ';'))