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ngx_http_variables.c
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// annotated by chrono since 2016
//
// * ngx_http_add_variable
// * ngx_http_get_variable
// * ngx_http_variables_init_vars
/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
#include <nginx.h>
// 1.11.10新增，处理前缀变量
// 在数组里查找是否已经有变量
// 有则返回，否则添加进数组
static ngx_http_variable_t *ngx_http_add_prefix_variable(ngx_conf_t *cf,
ngx_str_t *name, ngx_uint_t flags);
static ngx_int_t ngx_http_variable_request(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
#if 0
static void ngx_http_variable_request_set(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
#endif
static ngx_int_t ngx_http_variable_request_get_size(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_header(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_cookies(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_headers_internal(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data, u_char sep);
static ngx_int_t ngx_http_variable_unknown_header_in(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_unknown_header_out(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_unknown_trailer_out(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_request_line(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_cookie(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_argument(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
#if (NGX_HAVE_TCP_INFO)
static ngx_int_t ngx_http_variable_tcpinfo(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
#endif
static ngx_int_t ngx_http_variable_content_length(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_host(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_binary_remote_addr(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_remote_addr(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_remote_port(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_proxy_protocol_addr(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_proxy_protocol_port(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_proxy_protocol_tlv(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_server_addr(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_server_port(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_scheme(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_https(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static void ngx_http_variable_set_args(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_is_args(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_document_root(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_realpath_root(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_request_filename(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_server_name(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_request_method(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_remote_user(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_bytes_sent(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_body_bytes_sent(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_pipe(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_request_completion(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_request_body(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_request_body_file(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_request_length(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_request_time(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_request_id(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_status(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_sent_content_type(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_sent_content_length(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_sent_location(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_sent_last_modified(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_sent_connection(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_sent_keep_alive(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_sent_transfer_encoding(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static void ngx_http_variable_set_limit_rate(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_connection(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_connection_requests(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_connection_time(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_nginx_version(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_hostname(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_pid(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_msec(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_time_iso8601(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_time_local(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
/*
* TODO:
* Apache CGI: AUTH_TYPE, PATH_INFO (null), PATH_TRANSLATED
* REMOTE_HOST (null), REMOTE_IDENT (null),
* SERVER_SOFTWARE
*
* Apache SSI: DOCUMENT_NAME, LAST_MODIFIED, USER_NAME (file owner)
*/
/*
* the $http_host, $http_user_agent, $http_referer, and $http_via
* variables may be handled by generic
* ngx_http_variable_unknown_header_in(), but for performance reasons
* they are handled using dedicated entries
*/
static ngx_http_variable_t ngx_http_core_variables[] = {
{ ngx_string("http_host"), NULL, ngx_http_variable_header,
offsetof(ngx_http_request_t, headers_in.host), 0, 0 },
{ ngx_string("http_user_agent"), NULL, ngx_http_variable_header,
offsetof(ngx_http_request_t, headers_in.user_agent), 0, 0 },
{ ngx_string("http_referer"), NULL, ngx_http_variable_header,
offsetof(ngx_http_request_t, headers_in.referer), 0, 0 },
#if (NGX_HTTP_GZIP)
{ ngx_string("http_via"), NULL, ngx_http_variable_header,
offsetof(ngx_http_request_t, headers_in.via), 0, 0 },
#endif
#if (NGX_HTTP_X_FORWARDED_FOR)
{ ngx_string("http_x_forwarded_for"), NULL, ngx_http_variable_header,
offsetof(ngx_http_request_t, headers_in.x_forwarded_for), 0, 0 },
#endif
{ ngx_string("http_cookie"), NULL, ngx_http_variable_cookies,
offsetof(ngx_http_request_t, headers_in.cookie), 0, 0 },
{ ngx_string("content_length"), NULL, ngx_http_variable_content_length,
0, 0, 0 },
{ ngx_string("content_type"), NULL, ngx_http_variable_header,
offsetof(ngx_http_request_t, headers_in.content_type), 0, 0 },
{ ngx_string("host"), NULL, ngx_http_variable_host, 0, 0, 0 },
{ ngx_string("binary_remote_addr"), NULL,
ngx_http_variable_binary_remote_addr, 0, 0, 0 },
{ ngx_string("remote_addr"), NULL, ngx_http_variable_remote_addr, 0, 0, 0 },
{ ngx_string("remote_port"), NULL, ngx_http_variable_remote_port, 0, 0, 0 },
{ ngx_string("proxy_protocol_addr"), NULL,
ngx_http_variable_proxy_protocol_addr,
offsetof(ngx_proxy_protocol_t, src_addr), 0, 0 },
{ ngx_string("proxy_protocol_port"), NULL,
ngx_http_variable_proxy_protocol_port,
offsetof(ngx_proxy_protocol_t, src_port), 0, 0 },
{ ngx_string("proxy_protocol_server_addr"), NULL,
ngx_http_variable_proxy_protocol_addr,
offsetof(ngx_proxy_protocol_t, dst_addr), 0, 0 },
{ ngx_string("proxy_protocol_server_port"), NULL,
ngx_http_variable_proxy_protocol_port,
offsetof(ngx_proxy_protocol_t, dst_port), 0, 0 },
{ ngx_string("proxy_protocol_tlv_"), NULL,
ngx_http_variable_proxy_protocol_tlv,
0, NGX_HTTP_VAR_PREFIX, 0 },
{ ngx_string("server_addr"), NULL, ngx_http_variable_server_addr, 0, 0, 0 },
{ ngx_string("server_port"), NULL, ngx_http_variable_server_port, 0, 0, 0 },
{ ngx_string("server_protocol"), NULL, ngx_http_variable_request,
offsetof(ngx_http_request_t, http_protocol), 0, 0 },
{ ngx_string("scheme"), NULL, ngx_http_variable_scheme, 0, 0, 0 },
{ ngx_string("https"), NULL, ngx_http_variable_https, 0, 0, 0 },
{ ngx_string("request_uri"), NULL, ngx_http_variable_request,
offsetof(ngx_http_request_t, unparsed_uri), 0, 0 },
{ ngx_string("uri"), NULL, ngx_http_variable_request,
offsetof(ngx_http_request_t, uri),
NGX_HTTP_VAR_NOCACHEABLE, 0 },
{ ngx_string("document_uri"), NULL, ngx_http_variable_request,
offsetof(ngx_http_request_t, uri),
NGX_HTTP_VAR_NOCACHEABLE, 0 },
{ ngx_string("request"), NULL, ngx_http_variable_request_line, 0, 0, 0 },
{ ngx_string("document_root"), NULL,
ngx_http_variable_document_root, 0, NGX_HTTP_VAR_NOCACHEABLE, 0 },
{ ngx_string("realpath_root"), NULL,
ngx_http_variable_realpath_root, 0, NGX_HTTP_VAR_NOCACHEABLE, 0 },
{ ngx_string("query_string"), NULL, ngx_http_variable_request,
offsetof(ngx_http_request_t, args),
NGX_HTTP_VAR_NOCACHEABLE, 0 },
{ ngx_string("args"),
ngx_http_variable_set_args,
ngx_http_variable_request,
offsetof(ngx_http_request_t, args),
NGX_HTTP_VAR_CHANGEABLE|NGX_HTTP_VAR_NOCACHEABLE, 0 },
{ ngx_string("is_args"), NULL, ngx_http_variable_is_args,
0, NGX_HTTP_VAR_NOCACHEABLE, 0 },
{ ngx_string("request_filename"), NULL,
ngx_http_variable_request_filename, 0,
NGX_HTTP_VAR_NOCACHEABLE, 0 },
{ ngx_string("server_name"), NULL, ngx_http_variable_server_name, 0, 0, 0 },
{ ngx_string("request_method"), NULL,
ngx_http_variable_request_method, 0,
NGX_HTTP_VAR_NOCACHEABLE, 0 },
{ ngx_string("remote_user"), NULL, ngx_http_variable_remote_user, 0, 0, 0 },
{ ngx_string("bytes_sent"), NULL, ngx_http_variable_bytes_sent,
0, 0, 0 },
{ ngx_string("body_bytes_sent"), NULL, ngx_http_variable_body_bytes_sent,
0, 0, 0 },
{ ngx_string("pipe"), NULL, ngx_http_variable_pipe,
0, 0, 0 },
{ ngx_string("request_completion"), NULL,
ngx_http_variable_request_completion,
0, 0, 0 },
{ ngx_string("request_body"), NULL,
ngx_http_variable_request_body,
0, 0, 0 },
{ ngx_string("request_body_file"), NULL,
ngx_http_variable_request_body_file,
0, 0, 0 },
{ ngx_string("request_length"), NULL, ngx_http_variable_request_length,
0, NGX_HTTP_VAR_NOCACHEABLE, 0 },
{ ngx_string("request_time"), NULL, ngx_http_variable_request_time,
0, NGX_HTTP_VAR_NOCACHEABLE, 0 },
{ ngx_string("request_id"), NULL,
ngx_http_variable_request_id,
0, 0, 0 },
{ ngx_string("status"), NULL,
ngx_http_variable_status, 0,
NGX_HTTP_VAR_NOCACHEABLE, 0 },
{ ngx_string("sent_http_content_type"), NULL,
ngx_http_variable_sent_content_type, 0, 0, 0 },
{ ngx_string("sent_http_content_length"), NULL,
ngx_http_variable_sent_content_length, 0, 0, 0 },
{ ngx_string("sent_http_location"), NULL,
ngx_http_variable_sent_location, 0, 0, 0 },
{ ngx_string("sent_http_last_modified"), NULL,
ngx_http_variable_sent_last_modified, 0, 0, 0 },
{ ngx_string("sent_http_connection"), NULL,
ngx_http_variable_sent_connection, 0, 0, 0 },
{ ngx_string("sent_http_keep_alive"), NULL,
ngx_http_variable_sent_keep_alive, 0, 0, 0 },
{ ngx_string("sent_http_transfer_encoding"), NULL,
ngx_http_variable_sent_transfer_encoding, 0, 0, 0 },
{ ngx_string("sent_http_cache_control"), NULL, ngx_http_variable_header,
offsetof(ngx_http_request_t, headers_out.cache_control), 0, 0 },
{ ngx_string("sent_http_link"), NULL, ngx_http_variable_header,
offsetof(ngx_http_request_t, headers_out.link), 0, 0 },
{ ngx_string("limit_rate"), ngx_http_variable_set_limit_rate,
ngx_http_variable_request_get_size,
offsetof(ngx_http_request_t, limit_rate),
NGX_HTTP_VAR_CHANGEABLE|NGX_HTTP_VAR_NOCACHEABLE, 0 },
{ ngx_string("connection"), NULL,
ngx_http_variable_connection, 0, 0, 0 },
{ ngx_string("connection_requests"), NULL,
ngx_http_variable_connection_requests, 0, 0, 0 },
{ ngx_string("connection_time"), NULL, ngx_http_variable_connection_time,
0, NGX_HTTP_VAR_NOCACHEABLE, 0 },
{ ngx_string("nginx_version"), NULL, ngx_http_variable_nginx_version,
0, 0, 0 },
{ ngx_string("hostname"), NULL, ngx_http_variable_hostname,
0, 0, 0 },
{ ngx_string("pid"), NULL, ngx_http_variable_pid,
0, 0, 0 },
{ ngx_string("msec"), NULL, ngx_http_variable_msec,
0, NGX_HTTP_VAR_NOCACHEABLE, 0 },
{ ngx_string("time_iso8601"), NULL, ngx_http_variable_time_iso8601,
0, NGX_HTTP_VAR_NOCACHEABLE, 0 },
{ ngx_string("time_local"), NULL, ngx_http_variable_time_local,
0, NGX_HTTP_VAR_NOCACHEABLE, 0 },
#if (NGX_HAVE_TCP_INFO)
{ ngx_string("tcpinfo_rtt"), NULL, ngx_http_variable_tcpinfo,
0, NGX_HTTP_VAR_NOCACHEABLE, 0 },
{ ngx_string("tcpinfo_rttvar"), NULL, ngx_http_variable_tcpinfo,
1, NGX_HTTP_VAR_NOCACHEABLE, 0 },
{ ngx_string("tcpinfo_snd_cwnd"), NULL, ngx_http_variable_tcpinfo,
2, NGX_HTTP_VAR_NOCACHEABLE, 0 },
{ ngx_string("tcpinfo_rcv_space"), NULL, ngx_http_variable_tcpinfo,
3, NGX_HTTP_VAR_NOCACHEABLE, 0 },
#endif
{ ngx_string("http_"), NULL, ngx_http_variable_unknown_header_in,
0, NGX_HTTP_VAR_PREFIX, 0 },
{ ngx_string("sent_http_"), NULL, ngx_http_variable_unknown_header_out,
0, NGX_HTTP_VAR_PREFIX, 0 },
{ ngx_string("sent_trailer_"), NULL, ngx_http_variable_unknown_trailer_out,
0, NGX_HTTP_VAR_PREFIX, 0 },
{ ngx_string("cookie_"), NULL, ngx_http_variable_cookie,
0, NGX_HTTP_VAR_PREFIX, 0 },
{ ngx_string("arg_"), NULL, ngx_http_variable_argument,
0, NGX_HTTP_VAR_NOCACHEABLE|NGX_HTTP_VAR_PREFIX, 0 },
ngx_http_null_variable
};
ngx_http_variable_value_t ngx_http_variable_null_value =
ngx_http_variable("");
ngx_http_variable_value_t ngx_http_variable_true_value =
ngx_http_variable("1");
// 1.11.10新增
static ngx_uint_t ngx_http_variable_depth = 100;
// Nginx变量机制的核心函数，创建一个命名的变量访问对象
ngx_http_variable_t *
ngx_http_add_variable(ngx_conf_t *cf, ngx_str_t *name, ngx_uint_t flags)
{
ngx_int_t rc;
ngx_uint_t i;
ngx_hash_key_t *key;
ngx_http_variable_t *v;
ngx_http_core_main_conf_t *cmcf;
// 不允许空的变量名
if (name->len == 0) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid variable name \"$\"");
return NULL;
}
// 1.11.10,前缀变量特殊处理
if (flags & NGX_HTTP_VAR_PREFIX) {
return ngx_http_add_prefix_variable(cf, name, flags);
}
// 取core配置
cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
// 在variables_keys数组里查找
// 不允许添加重复的变量
// 但如果是changeable的是可以的
key = cmcf->variables_keys->keys.elts;
for (i = 0; i < cmcf->variables_keys->keys.nelts; i++) {
// 大小写无关比较变量名
if (name->len != key[i].key.len
|| ngx_strncasecmp(name->data, key[i].key.data, name->len) != 0)
{
continue;
}
v = key[i].value;
// 不是changeable则报错
if (!(v->flags & NGX_HTTP_VAR_CHANGEABLE)) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"the duplicate \"%V\" variable", name);
return NULL;
}
// 标志位去掉weak
// 如果没有weak，则设置除weak外的所有位
if (!(flags & NGX_HTTP_VAR_WEAK)) {
v->flags &= ~NGX_HTTP_VAR_WEAK;
}
// 是changeable，不需要新建，直接返回对象
return v;
}
// 查找完毕，没有重名
// 新建一个变量结构体
v = ngx_palloc(cf->pool, sizeof(ngx_http_variable_t));
if (v == NULL) {
return NULL;
}
// 拷贝变量的名字，在cf的内存池里分配内存
v->name.len = name->len;
v->name.data = ngx_pnalloc(cf->pool, name->len);
if (v->name.data == NULL) {
return NULL;
}
// 小写化同时拷贝
ngx_strlow(v->name.data, name->data, name->len);
// 初始化结构体
v->set_handler = NULL;
v->get_handler = NULL;
v->data = 0;
v->flags = flags;
v->index = 0;
// 把变量的hash key加入查找数组，方便之后建立散列表查找
rc = ngx_hash_add_key(cmcf->variables_keys, &v->name, v, 0);
if (rc == NGX_ERROR) {
return NULL;
}
if (rc == NGX_BUSY) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"conflicting variable name \"%V\"", name);
return NULL;
}
// 返回创建好的对象，注意里面的指针都是空
return v;
}
// 1.11.10新增，处理前缀变量
// 在数组里查找是否已经有变量
// 有则返回，否则添加进数组
static ngx_http_variable_t *
ngx_http_add_prefix_variable(ngx_conf_t *cf, ngx_str_t *name, ngx_uint_t flags)
{
ngx_uint_t i;
ngx_http_variable_t *v;
ngx_http_core_main_conf_t *cmcf;
// 取core配置
cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
// 在数组里查找是否已经有变量
// 有则返回，否则添加进数组
// 注意是prefix_variables
v = cmcf->prefix_variables.elts;
for (i = 0; i < cmcf->prefix_variables.nelts; i++) {
// 大小写无关比较变量名
if (name->len != v[i].name.len
|| ngx_strncasecmp(name->data, v[i].name.data, name->len) != 0)
{
continue;
}
v = &v[i];
if (!(v->flags & NGX_HTTP_VAR_CHANGEABLE)) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"the duplicate \"%V\" variable", name);
return NULL;
}
// 标志位去掉weak
// 如果没有weak，则设置除weak外的所有位
if (!(flags & NGX_HTTP_VAR_WEAK)) {
v->flags &= ~NGX_HTTP_VAR_WEAK;
}
return v;
}
// 数组里没有，则添加进数组
v = ngx_array_push(&cmcf->prefix_variables);
if (v == NULL) {
return NULL;
}
v->name.len = name->len;
v->name.data = ngx_pnalloc(cf->pool, name->len);
if (v->name.data == NULL) {
return NULL;
}
// 名字小写化
ngx_strlow(v->name.data, name->data, name->len);
v->set_handler = NULL;
v->get_handler = NULL;
v->data = 0;
v->flags = flags;
v->index = 0;
return v;
}
// 找到在cmcf->variables数组里的位置
ngx_int_t
ngx_http_get_variable_index(ngx_conf_t *cf, ngx_str_t *name)
{
ngx_uint_t i;
ngx_http_variable_t *v;
ngx_http_core_main_conf_t *cmcf;
if (name->len == 0) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid variable name \"$\"");
return NGX_ERROR;
}
cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
v = cmcf->variables.elts;
if (v == NULL) {
if (ngx_array_init(&cmcf->variables, cf->pool, 4,
sizeof(ngx_http_variable_t))
!= NGX_OK)
{
return NGX_ERROR;
}
} else {
for (i = 0; i < cmcf->variables.nelts; i++) {
if (name->len != v[i].name.len
|| ngx_strncasecmp(name->data, v[i].name.data, name->len) != 0)
{
continue;
}
return i;
}
}
v = ngx_array_push(&cmcf->variables);
if (v == NULL) {
return NGX_ERROR;
}
v->name.len = name->len;
v->name.data = ngx_pnalloc(cf->pool, name->len);
if (v->name.data == NULL) {
return NGX_ERROR;
}
ngx_strlow(v->name.data, name->data, name->len);
v->set_handler = NULL;
v->get_handler = NULL;
v->data = 0;
v->flags = 0;
v->index = cmcf->variables.nelts - 1;
return v->index;
}
// 使用index获取变量值，index即数组里的位置
ngx_http_variable_value_t *
ngx_http_get_indexed_variable(ngx_http_request_t *r, ngx_uint_t index)
{
ngx_http_variable_t *v;
ngx_http_core_main_conf_t *cmcf;
cmcf = ngx_http_get_module_main_conf(r, ngx_http_core_module);
// 检查index是否有效
if (cmcf->variables.nelts <= index) {
ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
"unknown variable index: %ui", index);
return NULL;
}
// 变量值仍然有效，或者是没有，那就直接返回
if (r->variables[index].not_found || r->variables[index].valid) {
return &r->variables[index];
}
// v是变量结构体数组
v = cmcf->variables.elts;
if (ngx_http_variable_depth == 0) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"cycle while evaluating variable \"%V\"",
&v[index].name);
return NULL;
}
ngx_http_variable_depth--;
// 直接用index得到变量结构体，然后调用get handler
// 获取的值存储在请求的数组里
if (v[index].get_handler(r, &r->variables[index], v[index].data)
== NGX_OK)
{
ngx_http_variable_depth++;
if (v[index].flags & NGX_HTTP_VAR_NOCACHEABLE) {
r->variables[index].no_cacheable = 1;
}
return &r->variables[index];
}
ngx_http_variable_depth++;
// get失败，设置为not found
r->variables[index].valid = 0;
r->variables[index].not_found = 1;
return NULL;
}
ngx_http_variable_value_t *
ngx_http_get_flushed_variable(ngx_http_request_t *r, ngx_uint_t index)
{
ngx_http_variable_value_t *v;
// 检查请求里的变量值数组
v = &r->variables[index];
// 检查变量值是否有效
if (v->valid || v->not_found) {
// 如果允许cache那么直接返回
if (!v->no_cacheable) {
return v;
}
// 设置为无效，要求重新获取
v->valid = 0;
v->not_found = 0;
}
// 使用index重新获取
return ngx_http_get_indexed_variable(r, index);
}
// 访问Nginx变量值
// 使用变量名和hash key在ngx_http_core_module里查找已经添加的变量
// 再调用get_handler获取变量值
ngx_http_variable_value_t *
ngx_http_get_variable(ngx_http_request_t *r, ngx_str_t *name, ngx_uint_t key)
{
size_t len;
ngx_uint_t i, n;
ngx_http_variable_t *v;
ngx_http_variable_value_t *vv;
ngx_http_core_main_conf_t *cmcf;
cmcf = ngx_http_get_module_main_conf(r, ngx_http_core_module);
// 用hash快速查找
v = ngx_hash_find(&cmcf->variables_hash, key, name->data, name->len);
if (v) {
if (v->flags & NGX_HTTP_VAR_INDEXED) {
return ngx_http_get_flushed_variable(r, v->index);
// } else {
// vv = ngx_palloc(r->pool, sizeof(ngx_http_variable_value_t));
// // 调用变量的get_handler获取值
// if (vv && v->get_handler(r, vv, v->data) == NGX_OK) {
// return vv;
// }
// return NULL;
// }
//}
//// 没找到，可能是http、arg等前缀的变量
//vv = ngx_palloc(r->pool, sizeof(ngx_http_variable_value_t));
//if (vv == NULL) {
// return NULL;
//}
//// 特殊处理http、arg等前缀的变量
//if (name->len >= 5 && ngx_strncmp(name->data, "http_", 5) == 0) {
// if (ngx_http_variable_unknown_header_in(r, vv, (uintptr_t) name)
// == NGX_OK)
// {
// return vv;
}
if (ngx_http_variable_depth == 0) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"cycle while evaluating variable \"%V\"", name);
return NULL;
}
ngx_http_variable_depth--;
vv = ngx_palloc(r->pool, sizeof(ngx_http_variable_value_t));
if (vv && v->get_handler(r, vv, v->data) == NGX_OK) {
ngx_http_variable_depth++;
return vv;
}
ngx_http_variable_depth++;
return NULL;
}
// 没找到，可能是http、arg等前缀的变量
vv = ngx_palloc(r->pool, sizeof(ngx_http_variable_value_t));
if (vv == NULL) {
return NULL;
}
len = 0;
v = cmcf->prefix_variables.elts;
n = cmcf->prefix_variables.nelts;
for (i = 0; i < cmcf->prefix_variables.nelts; i++) {
if (name->len >= v[i].name.len && name->len > len
&& ngx_strncmp(name->data, v[i].name.data, v[i].name.len) == 0)
{
len = v[i].name.len;
n = i;
}
}
if (n != cmcf->prefix_variables.nelts) {
if (v[n].get_handler(r, vv, (uintptr_t) name) == NGX_OK) {
return vv;
}
return NULL;
}
// 还是没有找到，那么就值not found
vv->not_found = 1;
return vv;
}
static ngx_int_t
ngx_http_variable_request(ngx_http_request_t *r, ngx_http_variable_value_t *v,
uintptr_t data)
{
ngx_str_t *s;
s = (ngx_str_t *) ((char *) r + data);
if (s->data) {
v->len = s->len;
v->valid = 1;
v->no_cacheable = 0;
v->not_found = 0;
v->data = s->data;
} else {
v->not_found = 1;
}
return NGX_OK;
}
#if 0
static void
ngx_http_variable_request_set(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data)
{
ngx_str_t *s;
s = (ngx_str_t *) ((char *) r + data);
s->len = v->len;
s->data = v->data;
}
#endif
static ngx_int_t
ngx_http_variable_request_get_size(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data)
{
size_t *sp;
sp = (size_t *) ((char *) r + data);
v->data = ngx_pnalloc(r->pool, NGX_SIZE_T_LEN);
if (v->data == NULL) {
return NGX_ERROR;
}
v->len = ngx_sprintf(v->data, "%uz", *sp) - v->data;
v->valid = 1;
v->no_cacheable = 0;
v->not_found = 0;
return NGX_OK;
}
// 在1.23.0之前，ngx_http_variable_header()只获取第一个header的值
// 获取多个值调用的是ngx_http_variable_headers()
static ngx_int_t
ngx_http_variable_header(ngx_http_request_t *r, ngx_http_variable_value_t *v,
uintptr_t data)
{
// 使用逗号分隔多个值，但如果值里有逗号，则无法区分
return ngx_http_variable_headers_internal(r, v, data, ',');
}
static ngx_int_t
ngx_http_variable_cookies(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data)
{
return ngx_http_variable_headers_internal(r, v, data, ';');
}
// 获取header的真正实现函数
static ngx_int_t
ngx_http_variable_headers_internal(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data, u_char sep)
{
size_t len;
u_char *p, *end;
ngx_table_elt_t *h, *th;
h = *(ngx_table_elt_t **) ((char *) r + data);
len = 0;
// 遍历链表
for (th = h; th; th = th->next) {
if (th->hash == 0) {
continue;
}
// 加2是因为要用", "分隔
len += th->value.len + 2;
}
if (len == 0) {
v->not_found = 1;
return NGX_OK;
}
// 减2，因为末尾不需要逗号
len -= 2;
v->valid = 1;
v->no_cacheable = 0;
v->not_found = 0;
// 链表只有一个元素，直接返回值
if (h->next == NULL) {
v->len = h->value.len;
v->data = h->value.data;
return NGX_OK;
}
// 分配内存
p = ngx_pnalloc(r->pool, len);
if (p == NULL) {
return NGX_ERROR;
}
v->len = len;
v->data = p;
end = p + len;
// 逐个拷贝header值输出
for (th = h; th; th = th->next) {
if (th->hash == 0) {
continue;
}
p = ngx_copy(p, th->value.data, th->value.len);
if (p == end) {
break;
}
// 添加分隔符
*p++ = sep; *p++ = ' ';
}
return NGX_OK;
}
// 处理http_*/sent_http_*等头
static ngx_int_t
ngx_http_variable_unknown_header_in(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data)
{