lighttpd 1.4.x https://www.lighttpd.net/
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%token_prefix TK_
%extra_argument {config_t *ctx}
%name configparser
%include {
#include "first.h"
#include "base.h"
#include "configfile.h"
#include "buffer.h"
#include "array.h"
#include "http_header.h" /* http_header_hkey_get() */
#include "request.h" /* http_request_host_normalize() */
#include <ctype.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
__attribute_pure__
static data_config * configparser_get_data_config(const array *a, const char *k, const size_t klen) {
return (data_config *)array_get_data_unset(a, k, klen);
}
static void configparser_push(config_t *ctx, data_config *dc, int isnew) {
if (isnew) {
dc->context_ndx = ctx->all_configs->used;
force_assert(dc->context_ndx > ctx->current->context_ndx);
array_insert_unique(ctx->all_configs, (data_unset *)dc);
dc->parent = ctx->current;
vector_config_weak_push(&dc->parent->children, dc);
}
if (ctx->configs_stack.used > 0 && ctx->current->context_ndx == 0) {
fprintf(stderr, "Cannot use conditionals inside a global { ... } block\n");
exit(-1);
}
vector_config_weak_push(&ctx->configs_stack, ctx->current);
ctx->current = dc;
}
static data_config *configparser_pop(config_t *ctx) {
data_config *old = ctx->current;
ctx->current = vector_config_weak_pop(&ctx->configs_stack);
return old;
}
/* return a copied variable */
static data_unset *configparser_get_variable(config_t *ctx, const buffer *key) {
const data_unset *du;
data_config *dc;
#if 0
fprintf(stderr, "get var %s\n", key->ptr);
#endif
for (dc = ctx->current; dc; dc = dc->parent) {
#if 0
fprintf(stderr, "get var on block: %s\n", dc->key.ptr);
array_print(dc->value, 0);
#endif
if (NULL != (du = array_get_element_klen(dc->value, BUF_PTR_LEN(key)))) {
data_unset *du_copy = du->fn->copy(du);
buffer_clear(&du_copy->key);
return du_copy;
}
}
return NULL;
}
/* op1 is to be eat/return by this function if success, op1->key is not cared
op2 is left untouch, unreferenced
*/
static data_unset *configparser_merge_data(data_unset *op1, const data_unset *op2) {
/* type mismatch */
if (op1->type != op2->type) {
if (op1->type == TYPE_STRING && op2->type == TYPE_INTEGER) {
data_string *ds = (data_string *)op1;
buffer_append_int(&ds->value, ((data_integer*)op2)->value);
return op1;
} else if (op1->type == TYPE_INTEGER && op2->type == TYPE_STRING) {
data_string *ds = array_data_string_init();
buffer_append_int(&ds->value, ((data_integer*)op1)->value);
buffer_append_string_buffer(&ds->value, &((data_string*)op2)->value);
op1->fn->free(op1);
return (data_unset *)ds;
} else {
fprintf(stderr, "data type mismatch, cannot merge\n");
op1->fn->free(op1);
return NULL;
}
}
switch (op1->type) {
case TYPE_STRING:
buffer_append_string_buffer(&((data_string *)op1)->value, &((data_string *)op2)->value);
break;
case TYPE_INTEGER:
((data_integer *)op1)->value += ((data_integer *)op2)->value;
break;
case TYPE_ARRAY: {
array *dst = &((data_array *)op1)->value;
array *src = &((data_array *)op2)->value;
const data_unset *du, *ddu;
size_t i;
for (i = 0; i < src->used; i ++) {
du = (data_unset *)src->data[i];
if (du) {
if (buffer_is_unset(&du->key)
|| !(ddu = array_get_element_klen(dst, BUF_PTR_LEN(&du->key)))){
array_insert_unique(dst, du->fn->copy(du));
} else {
fprintf(stderr, "Duplicate array-key '%s'\n", du->key.ptr);
if (ddu->type == du->type) {
/*(ignore if new key/value pair matches existing key/value)*/
if (du->type == TYPE_STRING
&& buffer_is_equal(&((data_string *)du)->value,
&((data_string *)ddu)->value))
continue;
if (du->type == TYPE_INTEGER
&& ((data_integer*)du)->value == ((data_integer*)ddu)->value)
continue;
}
op1->fn->free(op1);
return NULL;
}
}
}
break;
}
default:
force_assert(0);
break;
}
return op1;
}
__attribute_pure__
static comp_key_t
configparser_comp_key_id(const buffer * const obj_tag, const buffer * const comp_tag)
{
/* $REQUEST_HEADER["..."] */
/* $SERVER["socket"] */
/* $HTTP["..."] */
if (buffer_eq_slen(obj_tag, CONST_STR_LEN("REQUEST_HEADER")))
return COMP_HTTP_REQUEST_HEADER;
else if (buffer_eq_slen(obj_tag, CONST_STR_LEN("SERVER")))
return (buffer_eq_slen(comp_tag, CONST_STR_LEN("socket")))
? COMP_SERVER_SOCKET
: COMP_UNSET;
else if (buffer_eq_slen(obj_tag, CONST_STR_LEN("HTTP"))) {
static const struct {
comp_key_t comp;
uint32_t len;
const char *comp_tag;
} comps[] = {
{ COMP_HTTP_URL, CONST_LEN_STR("url" ) },
{ COMP_HTTP_HOST, CONST_LEN_STR("host" ) },
{ COMP_HTTP_REQUEST_HEADER, CONST_LEN_STR("referer" ) },
{ COMP_HTTP_USER_AGENT, CONST_LEN_STR("useragent" ) },
{ COMP_HTTP_REQUEST_HEADER, CONST_LEN_STR("user-agent" ) },
{ COMP_HTTP_LANGUAGE, CONST_LEN_STR("language" ) },
{ COMP_HTTP_REQUEST_HEADER, CONST_LEN_STR("cookie" ) },
{ COMP_HTTP_REMOTE_IP, CONST_LEN_STR("remoteip" ) },
{ COMP_HTTP_REMOTE_IP, CONST_LEN_STR("remote-ip" ) },
{ COMP_HTTP_QUERY_STRING, CONST_LEN_STR("querystring" ) },
{ COMP_HTTP_QUERY_STRING, CONST_LEN_STR("query-string" ) },
{ COMP_HTTP_REQUEST_METHOD, CONST_LEN_STR("request-method") },
{ COMP_HTTP_SCHEME, CONST_LEN_STR("scheme" ) }
};
for (uint32_t i = 0; i < sizeof(comps)/sizeof(comps[0]); ++i) {
if (buffer_eq_slen(comp_tag, comps[i].comp_tag, comps[i].len))
return comps[i].comp;
}
}
return COMP_UNSET;
}
static void
configparser_parse_condition(config_t * const ctx, const buffer * const obj_tag, const buffer * const comp_tag, const config_cond_t cond, buffer * const rvalue)
{
const char *op = NULL;
switch(cond) {
case CONFIG_COND_NE: op = "!="; break;
case CONFIG_COND_EQ: op = "=="; break;
case CONFIG_COND_NOMATCH: op = "!~"; break;
case CONFIG_COND_MATCH: op = "=~"; break;
default:
force_assert(0);
return; /* unreachable */
}
const uint32_t comp_offset = buffer_clen(&ctx->current->key)+3;
buffer * const tb = ctx->srv->tmp_buf;
buffer_clear(tb);
struct const_iovec iov[] = {
{ BUF_PTR_LEN(&ctx->current->key) }
,{ CONST_STR_LEN(" / ") } /* comp_offset */
,{ CONST_STR_LEN("$") }
,{ BUF_PTR_LEN(obj_tag) } /*(HTTP, REQUEST_HEADER, SERVER)*/
,{ CONST_STR_LEN("[\"") }
,{ BUF_PTR_LEN(comp_tag) }
,{ CONST_STR_LEN("\"] ") }
,{ op, 2 }
,{ CONST_STR_LEN(" \"") }
,{ BUF_PTR_LEN(rvalue) }
,{ CONST_STR_LEN("\"") }
};
buffer_append_iovec(tb, iov, sizeof(iov)/sizeof(*iov));
data_config *dc;
if (NULL != (dc = configparser_get_data_config(ctx->all_configs,
BUF_PTR_LEN(tb)))) {
configparser_push(ctx, dc, 0);
}
else {
dc = data_config_init();
dc->cond = cond;
dc->comp = configparser_comp_key_id(obj_tag, comp_tag);
buffer_copy_buffer(&dc->key, tb);
buffer_copy_buffer(&dc->comp_tag, comp_tag);
dc->comp_key = dc->key.ptr + comp_offset;
if (COMP_UNSET == dc->comp) {
fprintf(stderr, "error comp_key %s", dc->comp_key);
ctx->ok = 0;
}
else if (COMP_HTTP_LANGUAGE == dc->comp) {
dc->comp = COMP_HTTP_REQUEST_HEADER;
buffer_copy_string_len(&dc->comp_tag, CONST_STR_LEN("Accept-Language"));
}
else if (COMP_HTTP_USER_AGENT == dc->comp) {
dc->comp = COMP_HTTP_REQUEST_HEADER;
buffer_copy_string_len(&dc->comp_tag, CONST_STR_LEN("User-Agent"));
}
else if (COMP_HTTP_REMOTE_IP == dc->comp
&& (dc->cond == CONFIG_COND_EQ || dc->cond == CONFIG_COND_NE)) {
if (!config_remoteip_normalize(rvalue, tb)) {
fprintf(stderr, "invalid IP addr: %s\n", rvalue->ptr);
ctx->ok = 0;
}
}
else if (COMP_SERVER_SOCKET == dc->comp) {
/*(redundant with parsing in network.c; not actually required here)*/
if (rvalue->ptr[0] != ':' /*(network.c special-cases ":" and "[]")*/
&& !(rvalue->ptr[0] == '[' && rvalue->ptr[1] == ']')) {
if (http_request_host_normalize(rvalue, 0)) {
fprintf(stderr, "invalid IP addr: %s\n", rvalue->ptr);
ctx->ok = 0;
}
}
}
else if (COMP_HTTP_HOST == dc->comp) {
if (dc->cond == CONFIG_COND_EQ || dc->cond == CONFIG_COND_NE) {
if (http_request_host_normalize(rvalue, 0)) {
fprintf(stderr, "invalid IP addr: %s\n", rvalue->ptr);
ctx->ok = 0;
}
}
}
if (COMP_HTTP_REQUEST_HEADER == dc->comp) {
dc->ext = http_header_hkey_get(BUF_PTR_LEN(&dc->comp_tag));
}
buffer_move(&dc->string, rvalue);
if (ctx->ok)
configparser_push(ctx, dc, 1);
else
dc->fn->free((data_unset*) dc);
}
}
static void
configparser_parse_else_condition(config_t * const ctx)
{
data_config * const dc = data_config_init();
dc->cond = CONFIG_COND_ELSE;
buffer_append_str2(&dc->key, BUF_PTR_LEN(&ctx->current->key),
CONST_STR_LEN(" / "
"else_tmp_token"));
configparser_push(ctx, dc, 1);
}
}
%parse_failure {
ctx->ok = 0;
}
input ::= metalines.
metalines ::= metalines metaline.
metalines ::= .
metaline ::= varline.
metaline ::= global.
metaline ::= condlines(A) EOL. { A = NULL; }
metaline ::= include.
metaline ::= include_shell.
metaline ::= EOL.
%type value {data_unset *}
%type expression {data_unset *}
%type aelement {data_unset *}
%type condline {data_config *}
%type cond_else {data_config *}
%type condlines {data_config *}
%type aelements {array *}
%type array {array *}
%type key {buffer *}
%type stringop {buffer *}
%type cond {config_cond_t }
%destructor value { if ($$) $$->fn->free($$); }
%destructor expression { if ($$) $$->fn->free($$); }
%destructor aelement { if ($$) $$->fn->free($$); }
%destructor aelements { array_free($$); }
%destructor array { array_free($$); }
%destructor key { buffer_free($$); }
%destructor stringop { buffer_free($$); }
%token_type {buffer *}
%token_destructor { buffer_free($$); }
varline ::= key(A) ASSIGN expression(B). {
if (ctx->ok) {
buffer_copy_buffer(&B->key, A);
if (strncmp(A->ptr, "env.", sizeof("env.") - 1) == 0) {
fprintf(stderr, "Setting env variable is not supported in conditional %d %s: %s\n",
ctx->current->context_ndx,
ctx->current->key.ptr, A->ptr);
ctx->ok = 0;
} else if (NULL == array_get_element_klen(ctx->current->value, BUF_PTR_LEN(&B->key))) {
array_insert_unique(ctx->current->value, B);
B = NULL;
} else {
fprintf(stderr, "Duplicate config variable in conditional %d %s: %s\n",
ctx->current->context_ndx,
ctx->current->key.ptr, B->key.ptr);
ctx->ok = 0;
}
}
buffer_free(A);
A = NULL;
if (B) B->fn->free(B);
B = NULL;
}
varline ::= key(A) FORCE_ASSIGN expression(B). {
if (ctx->ok) {
if (strncmp(A->ptr, "env.", sizeof("env.") - 1) == 0) {
fprintf(stderr, "Setting env variable is not supported in conditional %d %s: %s\n",
ctx->current->context_ndx,
ctx->current->key.ptr, A->ptr);
ctx->ok = 0;
} else {
buffer_copy_buffer(&B->key, A);
array_replace(ctx->current->value, B);
B = NULL;
}
}
buffer_free(A);
A = NULL;
if (B) B->fn->free(B);
B = NULL;
}
varline ::= key(A) APPEND expression(B). {
if (ctx->ok) {
array *vars = ctx->current->value;
data_unset *du;
if (strncmp(A->ptr, "env.", sizeof("env.") - 1) == 0) {
fprintf(stderr, "Appending env variable is not supported in conditional %d %s: %s\n",
ctx->current->context_ndx,
ctx->current->key.ptr, A->ptr);
ctx->ok = 0;
} else if (NULL != (du = array_extract_element_klen(vars, BUF_PTR_LEN(A))) || NULL != (du = configparser_get_variable(ctx, A))) {
du = configparser_merge_data(du, B);
if (NULL == du) {
ctx->ok = 0;
}
else {
buffer_copy_buffer(&du->key, A);
array_insert_unique(ctx->current->value, du);
}
} else {
buffer_copy_buffer(&B->key, A);
array_insert_unique(ctx->current->value, B);
B = NULL;
}
}
buffer_free(A);
A = NULL;
if (B) B->fn->free(B);
B = NULL;
}
key(A) ::= LKEY(B). {
if (strchr(B->ptr, '.') == NULL) {
A = buffer_init_string("var.");
buffer_append_string_buffer(A, B);
} else {
A = B;
B = NULL;
}
buffer_free(B);
B = NULL;
}
expression(A) ::= expression(B) PLUS value(C). {
A = NULL;
if (ctx->ok) {
A = configparser_merge_data(B, C);
B = NULL;
if (NULL == A) {
ctx->ok = 0;
}
}
if (B) B->fn->free(B);
B = NULL;
if (C) C->fn->free(C);
C = NULL;
}
expression(A) ::= value(B). {
A = B;
B = NULL;
}
value(A) ::= key(B). {
A = NULL;
if (ctx->ok) {
if (strncmp(B->ptr, "env.", sizeof("env.") - 1) == 0) {
char *env;
if (NULL != (env = getenv(B->ptr + 4))) {
data_string *ds;
ds = array_data_string_init();
buffer_append_string(&ds->value, env);
A = (data_unset *)ds;
}
else {
fprintf(stderr, "Undefined env variable: %s\n", B->ptr + 4);
ctx->ok = 0;
}
} else if (NULL == (A = configparser_get_variable(ctx, B))) {
fprintf(stderr, "Undefined config variable: %s\n", B->ptr);
ctx->ok = 0;
}
}
buffer_free(B);
B = NULL;
}
value(A) ::= STRING(B). {
A = (data_unset *)array_data_string_init();
/* assumes array_data_string_init() result does not need swap, buffer_free()*/
memcpy(&((data_string *)A)->value, B, sizeof(*B));
free(B);
B = NULL;
}
value(A) ::= INTEGER(B). {
char *endptr;
A = (data_unset *)array_data_integer_init();
errno = 0;
((data_integer *)(A))->value = strtol(B->ptr, &endptr, 10);
/* skip trailing whitespace */
if (endptr != B->ptr) while (isspace(*(unsigned char *)endptr)) endptr++;
if (0 != errno || *endptr != '\0') {
fprintf(stderr, "error parsing number: '%s'\n", B->ptr);
ctx->ok = 0;
}
buffer_free(B);
B = NULL;
}
value(A) ::= array(B). {
A = (data_unset *)array_data_array_init();
/* assumes array_data_array_init() result does not need swap, array_free() */
memcpy(&((data_array *)(A))->value, B, sizeof(*B));
free(B);
B = NULL;
}
array(A) ::= LPARAN RPARAN. {
A = array_init(8);
}
array(A) ::= LPARAN aelements(B) RPARAN. {
A = B;
B = NULL;
}
aelements(A) ::= aelements(C) COMMA aelement(B). {
A = NULL;
if (ctx->ok) {
if (buffer_is_unset(&B->key) ||
NULL == array_get_element_klen(C, BUF_PTR_LEN(&B->key))) {
array_insert_unique(C, B);
B = NULL;
} else {
fprintf(stderr, "Error: duplicate array-key: %s. Please get rid of the duplicate entry.\n",
B->key.ptr);
ctx->ok = 0;
}
A = C;
C = NULL;
}
array_free(C);
C = NULL;
if (B) B->fn->free(B);
B = NULL;
}
aelements(A) ::= aelements(C) COMMA. {
A = C;
C = NULL;
}
aelements(A) ::= aelement(B). {
A = NULL;
if (ctx->ok) {
A = array_init(4);
array_insert_unique(A, B);
B = NULL;
}
if (B) B->fn->free(B);
B = NULL;
}
aelement(A) ::= expression(B). {
A = B;
B = NULL;
}
aelement(A) ::= stringop(B) ARRAY_ASSIGN expression(C). {
A = NULL;
if (ctx->ok) {
buffer_copy_buffer(&C->key, B);
A = C;
C = NULL;
}
if (C) C->fn->free(C);
C = NULL;
buffer_free(B);
B = NULL;
}
eols ::= EOL.
eols ::= .
globalstart ::= GLOBAL. {
data_config *dc;
dc = configparser_get_data_config(ctx->srv->config_context, CONST_STR_LEN("global"));
force_assert(dc);
configparser_push(ctx, dc, 0);
}
global ::= globalstart LCURLY metalines RCURLY. {
force_assert(ctx->current);
configparser_pop(ctx);
force_assert(ctx->current);
}
condlines(A) ::= condlines(B) eols ELSE condline(C). {
A = NULL;
if (ctx->ok) {
if (B->context_ndx >= C->context_ndx) {
fprintf(stderr, "unreachable else condition\n");
ctx->ok = 0;
}
if (B->cond == CONFIG_COND_ELSE) {
fprintf(stderr, "unreachable condition following else catch-all\n");
ctx->ok = 0;
}
C->prev = B;
B->next = C;
A = C;
}
B = NULL;
C = NULL;
}
condlines(A) ::= condlines(B) eols ELSE cond_else(C). {
A = NULL;
if (ctx->ok) {
if (B->context_ndx >= C->context_ndx) {
fprintf(stderr, "unreachable else condition\n");
ctx->ok = 0;
}
if (B->cond == CONFIG_COND_ELSE) {
fprintf(stderr, "unreachable condition following else catch-all\n");
ctx->ok = 0;
}
}
if (ctx->ok) {
size_t pos;
data_config *dc;
dc = (data_config *)array_extract_element_klen(ctx->all_configs, BUF_PTR_LEN(&C->key));
force_assert(C == dc);
buffer_copy_buffer(&C->key, &B->key);
C->comp_key = C->key.ptr + (B->comp_key - B->key.ptr);
C->comp = B->comp;
/*buffer_copy_buffer(&C->string, &B->string);*/
/* -2 for "==" and minus 3 for spaces and quotes around string (in key) */
pos = buffer_clen(&C->key) - buffer_clen(&B->string) - 5;
switch(B->cond) {
case CONFIG_COND_NE:
C->key.ptr[pos] = '='; /* opposite cond */
/*buffer_copy_string_len(C->op, CONST_STR_LEN("=="));*/
break;
case CONFIG_COND_EQ:
C->key.ptr[pos] = '!'; /* opposite cond */
/*buffer_copy_string_len(C->op, CONST_STR_LEN("!="));*/
break;
case CONFIG_COND_NOMATCH:
C->key.ptr[pos] = '='; /* opposite cond */
/*buffer_copy_string_len(C->op, CONST_STR_LEN("=~"));*/
break;
case CONFIG_COND_MATCH:
C->key.ptr[pos] = '!'; /* opposite cond */
/*buffer_copy_string_len(C->op, CONST_STR_LEN("!~"));*/
break;
default: /* should not happen; CONFIG_COND_ELSE checked further above */
force_assert(0);
}
if (NULL == (dc = configparser_get_data_config(ctx->all_configs, BUF_PTR_LEN(&C->key)))) {
/* re-insert into ctx->all_configs with new C->key */
array_insert_unique(ctx->all_configs, (data_unset *)C);
C->prev = B;
B->next = C;
} else {
fprintf(stderr, "unreachable else condition\n");
ctx->ok = 0;
C->fn->free((data_unset *)C);
C = dc;
}
A = C;
}
B = NULL;
C = NULL;
}
condlines(A) ::= condline(B). {
A = B;
B = NULL;
}
condline(A) ::= context LCURLY metalines RCURLY. {
A = NULL;
if (ctx->ok) {
data_config *cur;
cur = ctx->current;
configparser_pop(ctx);
force_assert(cur && ctx->current);
A = cur;
}
}
cond_else(A) ::= context_else LCURLY metalines RCURLY. {
A = NULL;
if (ctx->ok) {
data_config *cur;
cur = ctx->current;
configparser_pop(ctx);
force_assert(cur && ctx->current);
A = cur;
}
}
context ::= DOLLAR SRVVARNAME(B) LBRACKET stringop(C) RBRACKET cond(E) expression(D). {
if (ctx->ok && D->type != TYPE_STRING) {
fprintf(stderr, "rvalue must be string");
ctx->ok = 0;
}
if (ctx->ok) {
configparser_parse_condition(ctx, B, C, E, &((data_string *)D)->value);
}
buffer_free(B);
B = NULL;
buffer_free(C);
C = NULL;
D->fn->free(D);
D = NULL;
}
context_else ::= . {
if (ctx->ok) {
configparser_parse_else_condition(ctx);
}
}
cond(A) ::= EQ. {
A = CONFIG_COND_EQ;
}
cond(A) ::= MATCH. {
A = CONFIG_COND_MATCH;
}
cond(A) ::= NE. {
A = CONFIG_COND_NE;
}
cond(A) ::= NOMATCH. {
A = CONFIG_COND_NOMATCH;
}
stringop(A) ::= expression(B). {
A = NULL;
if (ctx->ok) {
if (B->type == TYPE_STRING) {
A = buffer_init_buffer(&((data_string*)B)->value);
} else if (B->type == TYPE_INTEGER) {
A = buffer_init();
buffer_append_int(A, ((data_integer *)B)->value);
} else {
fprintf(stderr, "operand must be string");
ctx->ok = 0;
}
}
if (B) B->fn->free(B);
B = NULL;
}
include ::= INCLUDE stringop(A). {
if (ctx->ok) {
if (0 != config_parse_file(ctx->srv, ctx, A->ptr)) {
ctx->ok = 0;
}
}
buffer_free(A);
A = NULL;
}
include_shell ::= INCLUDE_SHELL stringop(A). {
if (ctx->ok) {
if (0 != config_parse_cmd(ctx->srv, ctx, A->ptr)) {
ctx->ok = 0;
}
}
buffer_free(A);
A = NULL;
}