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nginx/src/http/modules/ngx_http_rewrite_module.c
Igor Sysoev 403d2443a3 nginx-0.1.34-RELEASE import 
*) Bugfix: the worker process may got caught in an endless loop if the
       big response part were include by SSI.

    *) Bugfix: the variables set by the "set" directive were not available
       in SSI.

    *) Feature: the "autoindex_localtime" directive.

    *) Bugfix: the empty value of the "proxy_set_header" directive forbids
       the client request header line passing.
2005-05-26 18:12:40 +00:00

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/*
* Copyright (C) Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
typedef struct {
ngx_str_t name;
ngx_uint_t wildcard;
} ngx_http_rewrite_referer_t;
typedef struct {
ngx_array_t *codes; /* uintptr_t */
ngx_array_t *referers; /* ngx_http_rewrite_referer_t */
ngx_uint_t captures;
ngx_uint_t stack_size;
ngx_flag_t log;
ngx_flag_t no_referer;
ngx_flag_t blocked_referer;
} ngx_http_rewrite_loc_conf_t;
static void *ngx_http_rewrite_create_loc_conf(ngx_conf_t *cf);
static char *ngx_http_rewrite_merge_loc_conf(ngx_conf_t *cf,
void *parent, void *child);
static ngx_int_t ngx_http_rewrite_init(ngx_cycle_t *cycle);
static char *ngx_http_rewrite(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
static char *ngx_http_rewrite_return(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static char *ngx_http_rewrite_if(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static char * ngx_http_rewrite_if_condition(ngx_conf_t *cf,
ngx_http_rewrite_loc_conf_t *lcf);
static char *ngx_http_rewrite_variable(ngx_conf_t *cf,
ngx_http_rewrite_loc_conf_t *lcf, ngx_str_t *value);
static char *ngx_http_rewrite_valid_referers(ngx_conf_t *cf,
ngx_command_t *cmd, void *conf);
static char *ngx_http_rewrite_set(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static ngx_command_t ngx_http_rewrite_commands[] = {
{ ngx_string("rewrite"),
NGX_HTTP_SRV_CONF|NGX_HTTP_SIF_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
|NGX_CONF_TAKE23,
ngx_http_rewrite,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
{ ngx_string("return"),
NGX_HTTP_SRV_CONF|NGX_HTTP_SIF_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
|NGX_CONF_TAKE1,
ngx_http_rewrite_return,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
{ ngx_string("if"),
NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_BLOCK|NGX_CONF_1MORE,
ngx_http_rewrite_if,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
{ ngx_string("valid_referers"),
NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
ngx_http_rewrite_valid_referers,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
{ ngx_string("set"),
NGX_HTTP_SRV_CONF|NGX_HTTP_SIF_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
|NGX_CONF_TAKE2,
ngx_http_rewrite_set,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
{ ngx_string("rewrite_log"),
NGX_HTTP_SRV_CONF|NGX_HTTP_SIF_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
|NGX_CONF_TAKE1,
ngx_conf_set_flag_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_rewrite_loc_conf_t, log),
NULL },
ngx_null_command
};
ngx_http_module_t ngx_http_rewrite_module_ctx = {
NULL, /* preconfiguration */
NULL, /* postconfiguration */
NULL, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
ngx_http_rewrite_create_loc_conf, /* create location configration */
ngx_http_rewrite_merge_loc_conf /* merge location configration */
};
ngx_module_t ngx_http_rewrite_module = {
NGX_MODULE_V1,
&ngx_http_rewrite_module_ctx, /* module context */
ngx_http_rewrite_commands, /* module directives */
NGX_HTTP_MODULE, /* module type */
ngx_http_rewrite_init, /* init module */
NULL /* init process */
};
static ngx_http_variable_value_t ngx_http_rewrite_null_value =
{ 0, ngx_string("") };
static ngx_int_t
ngx_http_rewrite_handler(ngx_http_request_t *r)
{
ngx_http_script_code_pt code;
ngx_http_script_engine_t *e;
ngx_http_rewrite_loc_conf_t *cf;
cf = ngx_http_get_module_loc_conf(r, ngx_http_rewrite_module);
if (cf->codes == NULL) {
return NGX_DECLINED;
}
e = ngx_pcalloc(r->pool, sizeof(ngx_http_script_engine_t));
if (e == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
e->sp = ngx_pcalloc(r->pool,
cf->stack_size * sizeof(ngx_http_variable_value_t));
if (e->sp == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
if (cf->captures) {
e->captures = ngx_palloc(r->pool, cf->captures * sizeof(int));
if (e->captures == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
} else {
e->captures = NULL;
}
e->ip = cf->codes->elts;
e->request = r;
e->quote = 1;
e->log = cf->log;
e->status = NGX_DECLINED;
while (*(uintptr_t *) e->ip) {
code = *(ngx_http_script_code_pt *) e->ip;
code(e);
}
return e->status;
}
static void
ngx_http_rewrite_invalid_referer_code(ngx_http_script_engine_t *e)
{
u_char *ref;
size_t len;
ngx_uint_t i, n;
ngx_http_request_t *r;
ngx_http_rewrite_referer_t *refs;
ngx_http_rewrite_loc_conf_t *cf;
r = e->request;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http rewrite invalid referer");
cf = ngx_http_get_module_loc_conf(r, ngx_http_rewrite_module);
e->ip += sizeof(uintptr_t);
if (cf->referers == NULL) {
e->sp->value = 0;
e->sp->text.len = 0;
e->sp->text.data = (u_char *) "";
e->sp++;
return;
}
if (r->headers_in.referer == NULL) {
if (cf->no_referer) {
e->sp->value = 0;
e->sp->text.len = 0;
e->sp->text.data = (u_char *) "";
e->sp++;
return;
} else {
e->sp->value = 1;
e->sp->text.len = 1;
e->sp->text.data = (u_char *) "1";
e->sp++;
return;
}
}
len = r->headers_in.referer->value.len;
ref = r->headers_in.referer->value.data;
if (len < sizeof("http://i.ru") - 1
|| (ngx_strncasecmp(ref, "http://", 7) != 0))
{
if (cf->blocked_referer) {
e->sp->value = 0;
e->sp->text.len = 0;
e->sp->text.data = (u_char *) "0";
e->sp++;
return;
} else {
e->sp->value = 1;
e->sp->text.len = 1;
e->sp->text.data = (u_char *) "1";
e->sp++;
return;
}
}
len -= 7;
ref += 7;
refs = cf->referers->elts;
for (i = 0; i < cf->referers->nelts; i++ ){
if (refs[i].name.len > len) {
continue;
}
if (refs[i].wildcard) {
for (n = 0; n < len; n++) {
if (ref[n] == '/' || ref[n] == ':') {
break;
}
if (ref[n] != '.') {
continue;
}
if (ngx_strncmp(&ref[n], refs[i].name.data,
refs[i].name.len) == 0)
{
e->sp->value = 0;
e->sp->text.len = 0;
e->sp->text.data = (u_char *) "";
e->sp++;
return;
}
}
} else {
if (ngx_strncasecmp(refs[i].name.data, ref, refs[i].name.len) == 0)
{
e->sp->value = 0;
e->sp->text.len = 0;
e->sp->text.data = (u_char *) "";
e->sp++;
return;
}
}
}
e->sp->value = 1;
e->sp->text.len = 1;
e->sp->text.data = (u_char *) "1";
e->sp++;
}
static ngx_http_variable_value_t *
ngx_http_rewrite_var(ngx_http_request_t *r, uintptr_t data)
{
ngx_http_variable_t *var;
ngx_http_core_main_conf_t *cmcf;
cmcf = ngx_http_get_module_main_conf(r, ngx_http_core_module);
var = cmcf->variables.elts;
/*
* the ngx_http_rewrite_module sets variables directly in r->variables,
* and they should be handled by ngx_http_get_indexed_variable(),
* so the handler is called only if the variable is not initialized
*/
ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
"using uninitialized \"%V\" variable", &var[data].name);
return &ngx_http_rewrite_null_value;
}
static void *
ngx_http_rewrite_create_loc_conf(ngx_conf_t *cf)
{
ngx_http_rewrite_loc_conf_t *conf;
conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_rewrite_loc_conf_t));
if (conf == NULL) {
return NGX_CONF_ERROR;
}
conf->stack_size = NGX_CONF_UNSET_UINT;
conf->log = NGX_CONF_UNSET;
conf->no_referer = NGX_CONF_UNSET;
conf->blocked_referer = NGX_CONF_UNSET;
return conf;
}
static char *
ngx_http_rewrite_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
{
ngx_http_rewrite_loc_conf_t *prev = parent;
ngx_http_rewrite_loc_conf_t *conf = child;
uintptr_t *code;
ngx_conf_merge_value(conf->log, prev->log, 0);
ngx_conf_merge_unsigned_value(conf->stack_size, prev->stack_size, 10);
if (conf->referers == NULL) {
conf->referers = prev->referers;
ngx_conf_merge_value(conf->no_referer, prev->no_referer, 0);
ngx_conf_merge_value(conf->blocked_referer, prev->blocked_referer, 0);
}
if (conf->no_referer == NGX_CONF_UNSET) {
conf->no_referer = 0;
}
if (conf->blocked_referer == NGX_CONF_UNSET) {
conf->blocked_referer = 0;
}
if (conf->codes == NULL) {
return NGX_CONF_OK;
}
if (conf->codes == prev->codes) {
return NGX_CONF_OK;
}
code = ngx_array_push_n(conf->codes, sizeof(uintptr_t));
if (code == NULL) {
return NGX_CONF_ERROR;
}
*code = (uintptr_t) NULL;
return NGX_CONF_OK;
}
static ngx_int_t
ngx_http_rewrite_init(ngx_cycle_t *cycle)
{
ngx_http_handler_pt *h;
ngx_http_core_main_conf_t *cmcf;
cmcf = ngx_http_cycle_get_module_main_conf(cycle, ngx_http_core_module);
h = ngx_array_push(&cmcf->phases[NGX_HTTP_REWRITE_PHASE].handlers);
if (h == NULL) {
return NGX_ERROR;
}
*h = ngx_http_rewrite_handler;
return NGX_OK;
}
static char *
ngx_http_rewrite(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_http_rewrite_loc_conf_t *lcf = conf;
ngx_str_t *value, err;
ngx_int_t n;
ngx_uint_t last;
ngx_http_script_code_pt *code;
ngx_http_script_compile_t sc;
ngx_http_script_regex_code_t *regex;
ngx_http_script_regex_end_code_t *regex_end;
u_char errstr[NGX_MAX_CONF_ERRSTR];
regex = ngx_http_script_start_code(cf->pool, &lcf->codes,
sizeof(ngx_http_script_regex_code_t));
if (regex == NULL) {
return NGX_CONF_ERROR;
}
ngx_memzero(regex, sizeof(ngx_http_script_regex_code_t));
value = cf->args->elts;
err.len = NGX_MAX_CONF_ERRSTR;
err.data = errstr;
/* TODO: NGX_REGEX_CASELESS */
regex->regex = ngx_regex_compile(&value[1], 0, cf->pool, &err);
if (regex->regex == NULL) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "%s", err.data);
return NGX_CONF_ERROR;
}
regex->code = ngx_http_script_regex_start_code;
regex->uri = 1;
regex->name = value[1];
if (value[2].data[value[2].len - 1] == '?') {
/* the last "?" drops the original arguments */
value[2].len--;
} else {
regex->add_args = 1;
}
last = 0;
if (ngx_strncmp(value[2].data, "http://", sizeof("http://") - 1) == 0) {
regex->status = NGX_HTTP_MOVED_TEMPORARILY;
regex->redirect = 1;
last = 1;
}
if (cf->args->nelts == 4) {
if (ngx_strcmp(value[3].data, "last") == 0) {
last = 1;
} else if (ngx_strcmp(value[3].data, "break") == 0) {
regex->break_cycle = 1;
last = 1;
} else if (ngx_strcmp(value[3].data, "redirect") == 0) {
regex->status = NGX_HTTP_MOVED_TEMPORARILY;
regex->redirect = 1;
last = 1;
} else if (ngx_strcmp(value[3].data, "permanent") == 0) {
regex->status = NGX_HTTP_MOVED_PERMANENTLY;
regex->redirect = 1;
last = 1;
} else {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid parameter \"%V\"", &value[3]);
return NGX_CONF_ERROR;
}
}
ngx_memzero(&sc, sizeof(ngx_http_script_compile_t));
sc.cf = cf;
sc.source = &value[2];
sc.lengths = &regex->lengths;
sc.values = &lcf->codes;
sc.variables = ngx_http_script_variables_count(&value[2]);
sc.main = regex;
sc.complete_lengths = 1;
sc.compile_args = !regex->redirect;
if (ngx_http_script_compile(&sc) != NGX_OK) {
return NGX_CONF_ERROR;
}
regex = sc.main;
regex->ncaptures = sc.ncaptures;
regex->size = sc.size;
regex->args = sc.args;
if (sc.variables == 0) {
regex->lengths = NULL;
}
n = ngx_regex_capture_count(regex->regex);
if (n < 0) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
ngx_regex_capture_count_n " failed for "
"pattern \"%V\"", &value[1]);
return NGX_CONF_ERROR;
}
if (regex->ncaptures > (ngx_uint_t) n) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"pattern \"%V\" has less captures "
"than referrenced in substitution \"%V\"",
&value[1], &value[2]);
return NGX_CONF_ERROR;
}
if (regex->ncaptures < (ngx_uint_t) n) {
regex->ncaptures = (ngx_uint_t) n;
}
if (regex->ncaptures) {
regex->ncaptures = (regex->ncaptures + 1) * 3;
if (lcf->captures < regex->ncaptures) {
lcf->captures = regex->ncaptures;
}
}
regex_end = ngx_http_script_add_code(lcf->codes,
sizeof(ngx_http_script_regex_end_code_t),
&regex);
if (regex_end == NULL) {
return NGX_CONF_ERROR;
}
regex_end->code = ngx_http_script_regex_end_code;
regex_end->uri = regex->uri;
regex_end->args = regex->args;
regex_end->add_args = regex->add_args;
regex_end->redirect = regex->redirect;
if (last) {
code = ngx_http_script_add_code(lcf->codes, sizeof(uintptr_t), &regex);
if (code == NULL) {
return NGX_CONF_ERROR;
}
*code = (uintptr_t) NULL;
}
regex->next = (u_char *) lcf->codes->elts + lcf->codes->nelts
- (u_char *) regex;
return NGX_CONF_OK;
}
static char *
ngx_http_rewrite_return(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_http_rewrite_loc_conf_t *lcf = conf;
ngx_str_t *value;
ngx_http_script_return_code_t *ret;
ret = ngx_http_script_start_code(cf->pool, &lcf->codes,
sizeof(ngx_http_script_return_code_t));
if (ret == NULL) {
return NGX_CONF_ERROR;
}
value = cf->args->elts;
ret->code = ngx_http_script_return_code;
ret->null = (uintptr_t) NULL;
ret->status = ngx_atoi(value[1].data, value[1].len);
if (ret->status == (uintptr_t) NGX_ERROR) {
return NGX_CONF_ERROR;
}
return NGX_CONF_OK;
}
static char *
ngx_http_rewrite_if(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_http_rewrite_loc_conf_t *lcf = conf;
void *mconf;
char *rv;
u_char *elts;
ngx_uint_t i;
ngx_conf_t save;
ngx_http_module_t *module;
ngx_http_conf_ctx_t *ctx, *pctx;
ngx_http_core_loc_conf_t *clcf, *pclcf, **clcfp;
ngx_http_script_if_code_t *if_code;
ngx_http_rewrite_loc_conf_t *nlcf;
ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_conf_ctx_t));
if (ctx == NULL) {
return NGX_CONF_ERROR;
}
pctx = cf->ctx;
ctx->main_conf = pctx->main_conf;
ctx->srv_conf = pctx->srv_conf;
ctx->loc_conf = ngx_pcalloc(cf->pool, sizeof(void *) * ngx_http_max_module);
if (ctx->loc_conf == NULL) {
return NGX_CONF_ERROR;
}
for (i = 0; ngx_modules[i]; i++) {
if (ngx_modules[i]->type != NGX_HTTP_MODULE) {
continue;
}
module = ngx_modules[i]->ctx;
if (module->create_loc_conf) {
mconf = module->create_loc_conf(cf);
if (mconf == NULL) {
return NGX_CONF_ERROR;
}
ctx->loc_conf[ngx_modules[i]->ctx_index] = mconf;
}
}
pclcf = pctx->loc_conf[ngx_http_core_module.ctx_index];
clcf = ctx->loc_conf[ngx_http_core_module.ctx_index];
clcf->loc_conf = ctx->loc_conf;
clcf->name = pclcf->name;
clcf->noname = 1;
if (pclcf->locations.elts == NULL) {
if (ngx_array_init(&pclcf->locations, cf->pool, 4, sizeof(void *))
== NGX_ERROR)
{
return NGX_CONF_ERROR;
}
}
clcfp = ngx_array_push(&pclcf->locations);
if (clcfp == NULL) {
return NGX_CONF_ERROR;
}
*clcfp = clcf;
if (ngx_http_rewrite_if_condition(cf, lcf) != NGX_CONF_OK) {
return NGX_CONF_ERROR;
}
if_code = ngx_array_push_n(lcf->codes, sizeof(ngx_http_script_if_code_t));
if (if_code == NULL) {
return NULL;
}
if_code->code = ngx_http_script_if_code;
elts = lcf->codes->elts;
/* the inside directives must compile to the same code array */
nlcf = ctx->loc_conf[ngx_http_rewrite_module.ctx_index];
nlcf->codes = lcf->codes;
save = *cf;
cf->ctx = ctx;
if (pclcf->name.len == 0) {
if_code->loc_conf = NULL;
cf->cmd_type = NGX_HTTP_SIF_CONF;
} else {
if_code->loc_conf = ctx->loc_conf;
cf->cmd_type = NGX_HTTP_LIF_CONF;
}
rv = ngx_conf_parse(cf, NULL);
*cf = save;
if (rv != NGX_CONF_OK) {
return rv;
}
if (lcf->captures < nlcf->captures) {
lcf->captures = nlcf->captures;
}
if (elts != lcf->codes->elts) {
if_code = (ngx_http_script_if_code_t *)
((u_char *) if_code + ((u_char *) lcf->codes->elts - elts));
}
if_code->next = (u_char *) lcf->codes->elts + lcf->codes->nelts
- (u_char *) if_code;
return NGX_CONF_OK;
}
static char *
ngx_http_rewrite_if_condition(ngx_conf_t *cf, ngx_http_rewrite_loc_conf_t *lcf)
{
ngx_str_t *value, err;
ngx_uint_t cur, last, n;
ngx_http_script_regex_code_t *regex;
u_char errstr[NGX_MAX_CONF_ERRSTR];
value = cf->args->elts;
last = cf->args->nelts - 1;
if (value[1].len < 1 || value[1].data[0] != '(') {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid condition \"%V\"", &value[1]);
return NGX_CONF_ERROR;
}
if (value[1].len == 1) {
cur = 2;
} else {
cur = 1;
value[1].len--;
value[1].data++;
}
if (value[last].len < 1 || value[last].data[value[last].len - 1] != ')') {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid condition \"%V\"", &value[last]);
return NGX_CONF_ERROR;
}
if (value[last].len == 1) {
last--;
} else {
value[last].len--;
value[last].data[value[last].len] = '\0';
}
if (value[cur].len > 1 && value[cur].data[0] == '$') {
if (cur != last && cur + 2 != last) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid condition \"%V\"", &value[cur]);
return NGX_CONF_ERROR;
}
if (ngx_http_rewrite_variable(cf, lcf, &value[cur])!= NGX_CONF_OK) {
return NGX_CONF_ERROR;
}
if (cur == last) {
return NGX_CONF_OK;
}
cur++;
if ((value[cur].len == 1 && value[cur].data[0] != '~')
|| (value[cur].len == 2
&& value[cur].data[0] != '~' && value[cur].data[1] != '*'))
{
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"unexpected \"%V\" in condition", &value[cur]);
return NGX_CONF_ERROR;
}
regex = ngx_http_script_start_code(cf->pool, &lcf->codes,
sizeof(ngx_http_script_regex_code_t));
if (regex == NULL) {
return NGX_CONF_ERROR;
}
ngx_memzero(regex, sizeof(ngx_http_script_regex_code_t));
err.len = NGX_MAX_CONF_ERRSTR;
err.data = errstr;
regex->regex = ngx_regex_compile(&value[last],
(value[cur].len == 2) ? NGX_REGEX_CASELESS : 0,
cf->pool, &err);
if (regex->regex == NULL) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "%s", err.data);
return NGX_CONF_ERROR;
}
regex->code = ngx_http_script_regex_start_code;
regex->next = sizeof(ngx_http_script_regex_code_t);
regex->test = 1;
regex->name = value[last];
n = ngx_regex_capture_count(regex->regex);
if (n) {
regex->ncaptures = (n + 1) * 3;
if (lcf->captures < regex->ncaptures) {
lcf->captures = regex->ncaptures;
}
}
return NGX_CONF_OK;
}
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid condition \"%V\"", &value[cur]);
return NGX_CONF_ERROR;
}
static char *
ngx_http_rewrite_variable(ngx_conf_t *cf, ngx_http_rewrite_loc_conf_t *lcf,
ngx_str_t *value)
{
ngx_int_t index;
ngx_http_script_code_pt *code;
ngx_http_script_var_code_t *var_code;
value->len--;
value->data++;
if (value->len == sizeof("invalid_referer") - 1
&& ngx_strncmp(value->data, "invalid_referer",
sizeof("invalid_referer") - 1) == 0)
{
code = ngx_http_script_start_code(cf->pool, &lcf->codes,
sizeof(ngx_http_script_code_pt));
if (code == NULL) {
return NGX_CONF_ERROR;
}
*code = ngx_http_rewrite_invalid_referer_code;
} else {
index = ngx_http_get_variable_index(cf, value);
if (index == NGX_ERROR) {
return NGX_CONF_ERROR;
}
var_code = ngx_http_script_start_code(cf->pool, &lcf->codes,
sizeof(ngx_http_script_var_code_t));
if (var_code == NULL) {
return NGX_CONF_ERROR;
}
var_code->code = ngx_http_script_var_code;
var_code->index = index;
}
return NGX_CONF_OK;
}
static char *
ngx_http_rewrite_valid_referers(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_http_rewrite_loc_conf_t *lcf = conf;
ngx_uint_t i, server_names;
ngx_str_t *value;
ngx_http_server_name_t *sn;
ngx_http_core_srv_conf_t *cscf;
ngx_http_rewrite_referer_t *ref;
cscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_core_module);
if (lcf->referers == NULL) {
lcf->referers = ngx_array_create(cf->pool,
cf->args->nelts + cscf->server_names.nelts,
sizeof(ngx_http_rewrite_referer_t));
if (lcf->referers == NULL) {
return NGX_CONF_ERROR;
}
}
value = cf->args->elts;
server_names = 0;
for (i = 1; i < cf->args->nelts; i++) {
if (value[i].len == 0) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid referer \"%V\"", &value[i]);
return NGX_CONF_ERROR;
}
if (ngx_strcmp(value[i].data, "none") == 0) {
lcf->no_referer = 1;
continue;
}
if (ngx_strcmp(value[i].data, "blocked") == 0) {
lcf->blocked_referer = 1;
continue;
}
if (ngx_strcmp(value[i].data, "server_names") == 0) {
server_names = 1;
continue;
}
ref = ngx_array_push(lcf->referers);
if (ref == NULL) {
return NGX_CONF_ERROR;
}
if (value[i].data[0] != '*') {
ref->name = value[i];
ref->wildcard = 0;
continue;
}
if (value[i].data[1] != '.') {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid wildcard referer \"%V\"", &value[i]);
return NGX_CONF_ERROR;
}
ref->name.len = value[i].len - 1;
ref->name.data = value[i].data + 1;
ref->wildcard = 1;
}
if (!server_names) {
return NGX_CONF_OK;
}
sn = cscf->server_names.elts;
for (i = 0; i < cscf->server_names.nelts; i++) {
ref = ngx_array_push(lcf->referers);
if (ref == NULL) {
return NGX_CONF_ERROR;
}
ref->name.len = sn[i].name.len + 1;
ref->name.data = ngx_palloc(cf->pool, ref->name.len);
if (ref->name.data == NULL) {
return NGX_CONF_ERROR;
}
ngx_memcpy(ref->name.data, sn[i].name.data, sn[i].name.len);
ref->name.data[sn[i].name.len] = '/';
ref->wildcard = sn[i].wildcard;
}
return NGX_CONF_OK;
}
static char *
ngx_http_rewrite_set(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_http_rewrite_loc_conf_t *lcf = conf;
ngx_int_t n, index;
ngx_str_t *value;
ngx_http_variable_t *v;
ngx_http_script_compile_t sc;
ngx_http_script_var_code_t *var;
ngx_http_script_value_code_t *val;
ngx_http_script_complex_value_code_t *complex;
value = cf->args->elts;
if (value[1].data[0] != '$') {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid variable name \"%V\"", &value[1]);
return NGX_CONF_ERROR;
}
value[1].len--;
value[1].data++;
v = ngx_http_add_variable(cf, &value[1], NGX_HTTP_VAR_CHANGABLE);
if (v == NULL) {
return NGX_CONF_ERROR;
}
index = ngx_http_get_variable_index(cf, &value[1]);
if (index == NGX_ERROR) {
return NGX_CONF_ERROR;
}
v->handler = ngx_http_rewrite_var;
v->data = index;
n = ngx_http_script_variables_count(&value[2]);
if (n == 0) {
val = ngx_http_script_start_code(cf->pool, &lcf->codes,
sizeof(ngx_http_script_value_code_t));
if (val == NULL) {
return NGX_CONF_ERROR;
}
n = ngx_atoi(value[2].data, value[2].len);
if (n == NGX_ERROR) {
n = 0;
}
val->code = ngx_http_script_value_code;
val->value = (uintptr_t) n;
val->text_len = (uintptr_t) value[2].len;
val->text_data = (uintptr_t) value[2].data;
} else {
complex = ngx_http_script_start_code(cf->pool, &lcf->codes,
sizeof(ngx_http_script_complex_value_code_t));
if (complex == NULL) {
return NGX_CONF_ERROR;
}
complex->code = ngx_http_script_complex_value_code;
complex->lengths = NULL;
ngx_memzero(&sc, sizeof(ngx_http_script_compile_t));
sc.cf = cf;
sc.source = &value[2];
sc.lengths = &complex->lengths;
sc.values = &lcf->codes;
sc.variables = n;
sc.complete_lengths = 1;
if (ngx_http_script_compile(&sc) != NGX_OK) {
return NGX_CONF_ERROR;
}
}
var = ngx_http_script_start_code(cf->pool, &lcf->codes,
sizeof(ngx_http_script_var_code_t));
if (var == NULL) {
return NGX_CONF_ERROR;
}
var->code = ngx_http_script_set_var_code;
var->index = (uintptr_t) index;
return NGX_CONF_OK;
}
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