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0e5dc5cff6
nginx/src/http/modules/ngx_http_index_module.c
Igor Sysoev 0e5dc5cff6 nginx-0.3.10-RELEASE import 
*) Change: the "valid_referers" directive and the "$invalid_referer"
       variable were moved to the new ngx_http_referer_module from the
       ngx_http_rewrite_module.

    *) Change: the "$apache_bytes_sent" variable name was changed to
       "$body_bytes_sent".

    *) Feature: the "$sent_http_..." variables.

    *) Feature: the "if" directive supports the "=" and "!=" operations.

    *) Feature: the "proxy_pass" directive supports the HTTPS protocol.

    *) Feature: the "proxy_set_body" directive.

    *) Feature: the "post_action" directive.

    *) Feature: the ngx_http_empty_gif_module.

    *) Feature: the "worker_cpu_affinity" directive for Linux.

    *) Bugfix: the "rewrite" directive did not unescape URI part in
       redirect, now it is unescaped except the %00-%25 and %7F-%FF
       characters.

    *) Bugfix: nginx could not be built by the icc 9.0 compiler.

    *) Bugfix: if the SSI was enabled for zero size static file, then the
       chunked response was encoded incorrectly.
2005-11-15 13:30:52 +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_array_t *lengths;
ngx_array_t *values;
} ngx_http_index_t;
typedef struct {
ngx_array_t *indices; /* array of ngx_http_index_t */
size_t max_index_len;
} ngx_http_index_loc_conf_t;
typedef struct {
ngx_uint_t current;
ngx_str_t path;
ngx_str_t index;
ngx_uint_t tested; /* unsigned tested:1 */
} ngx_http_index_ctx_t;
#define NGX_HTTP_DEFAULT_INDEX "index.html"
static ngx_int_t ngx_http_index_test_dir(ngx_http_request_t *r,
ngx_http_index_ctx_t *ctx);
static ngx_int_t ngx_http_index_error(ngx_http_request_t *r,
ngx_http_index_ctx_t *ctx, ngx_err_t err);
static ngx_int_t ngx_http_index_init(ngx_cycle_t *cycle);
static void *ngx_http_index_create_loc_conf(ngx_conf_t *cf);
static char *ngx_http_index_merge_loc_conf(ngx_conf_t *cf,
void *parent, void *child);
static char *ngx_http_index_set_index(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static ngx_command_t ngx_http_index_commands[] = {
{ ngx_string("index"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
ngx_http_index_set_index,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
#if (NGX_HTTP_CACHE)
{ ngx_string("index_cache"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE3,
ngx_http_set_cache_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_index_loc_conf_t, index_cache),
NULL },
#endif
ngx_null_command
};
ngx_http_module_t ngx_http_index_module_ctx = {
NULL, /* preconfiguration */
NULL, /* postconfiguration */
NULL, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
ngx_http_index_create_loc_conf, /* create location configration */
ngx_http_index_merge_loc_conf /* merge location configration */
};
ngx_module_t ngx_http_index_module = {
NGX_MODULE_V1,
&ngx_http_index_module_ctx, /* module context */
ngx_http_index_commands, /* module directives */
NGX_HTTP_MODULE, /* module type */
NULL, /* init master */
ngx_http_index_init, /* init module */
NULL, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};
/*
* Try to open the first index file before the test of the directory existence
* because the valid requests should be many more than invalid ones.
* If open() would fail, then stat() should be more quickly because some data
* is already cached in the kernel.
* Besides, Win32 has ERROR_PATH_NOT_FOUND (NGX_ENOTDIR).
* Unix has ENOTDIR error, although it less helpfull - it points only
* that path contains the usual file in place of the directory.
*/
static ngx_int_t
ngx_http_index_handler(ngx_http_request_t *r)
{
u_char *last;
size_t len;
ngx_fd_t fd;
ngx_int_t rc;
ngx_err_t err;
ngx_str_t uri;
ngx_log_t *log;
ngx_uint_t i;
ngx_http_index_t *index;
ngx_http_index_ctx_t *ctx;
ngx_pool_cleanup_t *cln;
ngx_pool_cleanup_file_t *clnf;
ngx_http_script_code_pt code;
ngx_http_script_engine_t e;
ngx_http_core_loc_conf_t *clcf;
ngx_http_index_loc_conf_t *ilcf;
ngx_http_script_len_code_pt lcode;
if (r->uri.data[r->uri.len - 1] != '/') {
return NGX_DECLINED;
}
/* TODO: Win32 */
if (r->zero_in_uri) {
return NGX_DECLINED;
}
log = r->connection->log;
/*
* we use context because the handler supports an async file opening,
* and may be called several times
*/
ilcf = ngx_http_get_module_loc_conf(r, ngx_http_index_module);
ctx = ngx_http_get_module_ctx(r, ngx_http_index_module);
if (ctx == NULL) {
ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_index_ctx_t));
if (ctx == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
ngx_http_set_ctx(r, ctx, ngx_http_index_module);
}
index = ilcf->indices->elts;
for (i = ctx->current; i < ilcf->indices->nelts; i++) {
if (index[i].lengths == NULL) {
if (index[i].name.data[0] == '/') {
return ngx_http_internal_redirect(r, &index[i].name, &r->args);
}
len = ilcf->max_index_len;
ctx->index.len = index[i].name.len;
} else {
ngx_memzero(&e, sizeof(ngx_http_script_engine_t));
e.ip = index[i].lengths->elts;
e.request = r;
e.flushed = 1;
/* 1 byte for terminating '\0' */
len = 1;
while (*(uintptr_t *) e.ip) {
lcode = *(ngx_http_script_len_code_pt *) e.ip;
len += lcode(&e);
}
ctx->index.len = len;
/* 16 bytes are preallocation */
len += 16;
}
if (len > ctx->path.len) {
last = ngx_http_map_uri_to_path(r, &ctx->path, len);
if (last == NULL) {
return NGX_ERROR;
}
ctx->index.data = last;
}
if (index[i].values == NULL) {
/* index[i].name.len includes the terminating '\0' */
ngx_memcpy(ctx->index.data, index[i].name.data, index[i].name.len);
} else {
e.ip = index[i].values->elts;
e.pos = ctx->index.data;
while (*(uintptr_t *) e.ip) {
code = *(ngx_http_script_code_pt *) e.ip;
code((ngx_http_script_engine_t *) &e);
}
if (*ctx->index.data == '/') {
ctx->index.len--;
return ngx_http_internal_redirect(r, &ctx->index, &r->args);
}
*e.pos++ = '\0';
}
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, log, 0,
"open index \"%s\"", ctx->path.data);
cln = ngx_pool_cleanup_add(r->pool, sizeof(ngx_pool_cleanup_file_t));
if (cln == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
fd = ngx_open_file(ctx->path.data, NGX_FILE_RDONLY, NGX_FILE_OPEN);
if (fd == (ngx_fd_t) NGX_AGAIN) {
ctx->current = i;
return NGX_AGAIN;
}
if (fd == NGX_INVALID_FILE) {
err = ngx_errno;
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, log, err,
ngx_open_file_n " \"%s\" failed", ctx->path.data);
if (err == NGX_ENOTDIR) {
return ngx_http_index_error(r, ctx, err);
} else if (err == NGX_EACCES) {
return ngx_http_index_error(r, ctx, err);
}
if (!ctx->tested) {
rc = ngx_http_index_test_dir(r, ctx);
if (rc != NGX_OK) {
return rc;
}
ctx->tested = 1;
}
if (err == NGX_ENOENT) {
continue;
}
ngx_log_error(NGX_LOG_ERR, log, err,
ngx_open_file_n " \"%s\" failed", ctx->path.data);
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
cln->handler = ngx_pool_cleanup_file;
clnf = cln->data;
clnf->fd = fd;
clnf->name = ctx->path.data;
clnf->log = r->pool->log;
clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
uri.len = r->uri.len + ctx->index.len - 1;
if (!clcf->alias) {
uri.data = ctx->path.data + clcf->root.len;
} else {
uri.data = ngx_palloc(r->pool, uri.len);
if (uri.data == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
last = ngx_copy(uri.data, r->uri.data, r->uri.len);
ngx_memcpy(last, ctx->index.data, ctx->index.len - 1);
}
return ngx_http_internal_redirect(r, &uri, &r->args);
}
return NGX_DECLINED;
}
static ngx_int_t
ngx_http_index_test_dir(ngx_http_request_t *r, ngx_http_index_ctx_t *ctx)
{
ngx_err_t err;
ngx_file_info_t fi;
*(ctx->index.data - 1) = '\0';
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http index check dir: \"%s\"", ctx->path.data);
if (ngx_file_info(ctx->path.data, &fi) == -1) {
err = ngx_errno;
if (err == NGX_ENOENT) {
*(ctx->index.data - 1) = '/';
return ngx_http_index_error(r, ctx, err);
}
ngx_log_error(NGX_LOG_CRIT, r->connection->log, err,
ngx_file_info_n " \"%s\" failed", ctx->path.data);
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
*(ctx->index.data - 1) = '/';
if (ngx_is_dir(&fi)) {
return NGX_OK;
}
ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
"\"%s\" is not a directory", ctx->path.data);
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
static ngx_int_t
ngx_http_index_error(ngx_http_request_t *r, ngx_http_index_ctx_t *ctx,
ngx_err_t err)
{
if (err == NGX_EACCES) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, err,
"\"%s\" is forbidden", ctx->path.data);
return NGX_HTTP_FORBIDDEN;
}
ngx_log_error(NGX_LOG_ERR, r->connection->log, err,
"\"%s\" is not found", ctx->path.data);
return NGX_HTTP_NOT_FOUND;
}
static void *
ngx_http_index_create_loc_conf(ngx_conf_t *cf)
{
ngx_http_index_loc_conf_t *conf;
conf = ngx_palloc(cf->pool, sizeof(ngx_http_index_loc_conf_t));
if (conf == NULL) {
return NGX_CONF_ERROR;
}
conf->indices = NULL;
conf->max_index_len = 1;
return conf;
}
static char *
ngx_http_index_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
{
ngx_http_index_loc_conf_t *prev = parent;
ngx_http_index_loc_conf_t *conf = child;
ngx_http_index_t *index;
if (conf->indices == NULL) {
conf->indices = prev->indices;
conf->max_index_len = prev->max_index_len;
}
if (conf->indices == NULL) {
conf->indices = ngx_array_create(cf->pool, 1, sizeof(ngx_http_index_t));
if (conf->indices == NULL) {
return NGX_CONF_ERROR;
}
index = ngx_array_push(conf->indices);
if (index == NULL) {
return NGX_CONF_ERROR;
}
index->name.len = sizeof(NGX_HTTP_DEFAULT_INDEX);
index->name.data = (u_char *) NGX_HTTP_DEFAULT_INDEX;
index->lengths = NULL;
index->values = NULL;
conf->max_index_len = sizeof(NGX_HTTP_DEFAULT_INDEX);
return NGX_CONF_OK;
}
return NGX_CONF_OK;
}
/* TODO: warn about duplicate indices */
static char *
ngx_http_index_set_index(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_http_index_loc_conf_t *ilcf = conf;
ngx_uint_t i, n;
ngx_str_t *value;
ngx_http_index_t *index;
ngx_http_script_compile_t sc;
if (ilcf->indices == NULL) {
ilcf->indices = ngx_array_create(cf->pool, 2, sizeof(ngx_http_index_t));
if (ilcf->indices == NULL) {
return NGX_CONF_ERROR;
}
}
value = cf->args->elts;
for (i = 1; i < cf->args->nelts; i++) {
if (value[i].data[0] == '/' && i != cf->args->nelts - 1) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"only the last index in \"index\" directive "
"may be absolute");
return NGX_CONF_ERROR;
}
if (value[i].len == 0) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"index \"%V\" in \"index\" directive is invalid",
&value[1]);
return NGX_CONF_ERROR;
}
index = ngx_array_push(ilcf->indices);
if (index == NULL) {
return NGX_CONF_ERROR;
}
index->name.len = value[i].len;
index->name.data = value[i].data;
index->lengths = NULL;
index->values = NULL;
n = ngx_http_script_variables_count(&value[i]);
if (n == 0) {
if (ilcf->max_index_len != 0
&& ilcf->max_index_len < index->name.len)
{
ilcf->max_index_len = index->name.len;
}
/* include the terminating '\0' to the length to use ngx_copy() */
index->name.len++;
continue;
}
ngx_memzero(&sc, sizeof(ngx_http_script_compile_t));
sc.cf = cf;
sc.source = &value[i];
sc.lengths = &index->lengths;
sc.values = &index->values;
sc.variables = n;
sc.complete_lengths = 1;
sc.complete_values = 1;
if (ngx_http_script_compile(&sc) != NGX_OK) {
return NGX_CONF_ERROR;
}
ilcf->max_index_len = 0;
}
return NGX_CONF_OK;
}
static ngx_int_t
ngx_http_index_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_CONTENT_PHASE].handlers);
if (h == NULL) {
return NGX_ERROR;
}
*h = ngx_http_index_handler;
return NGX_OK;
}
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