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ngx_hmux_module.c
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ngx_hmux_module.c
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/*-----------------------------------------------------------------------------
* Description: implements resin's mod_caucho function for nginx
* Version: 0.5
* Author: bin wang
* Company: netease
* Mail: 163.beijing@gmail.com
* Attension:
* 1) it is tested in linux only
* 2) we have already tested eight projects for this module:
* resin-doc
* jackrabbit
* hudson
* jetspeed
* geoserver
* VQWiki
* struts2-showcase
* spring-security-samples
* all are easily deployed in resin (web war)
* 3) this module references yaoweibin's nginx ajp module
* 4) if you use keepalive module,you should set accept_mutex
* off in multiprocess environment
* 5) if you have any problems or bugs, please contact me
*
* The following describes the hmux protocol implemented in this module
*
* hmux protocol
* A GET request:
* Frontend Backend
* CSE_METHOD
* ...
* CSE_HEADER/CSE_VALUE
* CSE_END
* CSE_DATA
* CSE_DATA
* CSE_END
*
* Short POST:
* Frontend Backend
* CSE_METHOD
* ...
* CSE_HEADER/CSE_VALUE
* CSE_DATA
* CSE_END
* CSE_DATA
* CSE_DATA
* CSE_END
*
* Long POST:
* Frontend Backend
* CSE_METHOD
* ...
* CSE_HEADER/CSE_VALUE
* CSE_DATA
* CSE_DATA (optional) #here we buffer resp data
* CSE_DATA
* CSE_ACK
* CSE_DATA (optional) #here we buffer resp data
* CSE_DATA
* CSE_ACK
* CSE_END
* CSE_DATA
* CSE_END
*
*
*---------------------------------------------------------------------------*/
#include <nginx.h>
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
#define HMUX_CHANNEL 'C'
#define HMUX_ACK 'A'
#define HMUX_ERROR 'E'
#define HMUX_YIELD 'Y'
#define HMUX_QUIT 'Q'
#define HMUX_EXIT 'X'
#define HMUX_DATA 'D'
#define HMUX_URL 'U'
#define HMUX_STRING 'S'
#define HMUX_HEADER 'H'
#define HMUX_META_HEADER 'M'
#define HMUX_PROTOCOL 'P'
#define CSE_NULL '?'
#define CSE_PATH_INFO 'b'
#define CSE_PROTOCOL 'c'
#define CSE_REMOTE_USER 'd'
#define CSE_QUERY_STRING 'e'
#define CSE_SERVER_PORT 'g'
#define CSE_REMOTE_HOST 'h'
#define CSE_REMOTE_ADDR 'i'
#define CSE_REMOTE_PORT 'j'
#define CSE_REAL_PATH 'k'
#define CSE_AUTH_TYPE 'n'
#define CSE_URI 'o'
#define CSE_CONTENT_LENGTH 'p'
#define CSE_CONTENT_TYPE 'q'
#define CSE_IS_SECURE 'r'
#define CSE_SESSION_GROUP 's'
#define CSE_CLIENT_CERT 't'
#define CSE_SERVER_TYPE 'u'
#define HMUX_METHOD 'm'
#define HMUX_FLUSH 'f'
#define HMUX_SERVER_NAME 'v'
#define HMUX_STATUS 's'
#define HMUX_CLUSTER 'c'
#define HMUX_SRUN 's'
#define HMUX_SRUN_BACKUP 'b'
#define HMUX_SRUN_SSL 'e'
#define HMUX_UNAVAILABLE 'u'
#define HMUX_WEB_APP_UNAVAILABLE 'U'
#define CSE_HEADER 'H'
#define CSE_VALUE 'V'
#define CSE_STATUS 'S'
#define CSE_SEND_HEADER 'G'
#define CSE_PING 'P'
#define CSE_QUERY 'Q'
#define CSE_ACK 'A'
#define CSE_DATA 'D'
#define CSE_FLUSH 'F'
#define CSE_KEEPALIVE 'K'
#define CSE_END 'Z'
#define CSE_CLOSE 'X'
#define HMUX_CMD_SZ 8
#define HMUX_DATA_SEG_SZ 8
#define HMUX_META_DATA_LEN 3
#define HMUX_MSG_BUFFER_SZ 8192
#define HMUX_MAX_BUFFER_SZ 65536
#define HMUX_DISPATCH_PROTOCOL 0x102
#define HMUX_QUERY 0x102
#define HMUX_EOVERFLOW 1001
ngx_module_t ngx_hmux_module;
typedef struct hmux_msg_s hmux_msg_t;
struct hmux_msg_s
{
ngx_buf_t *buf;
};
typedef struct {
size_t hmux_header_packet_buffer_size_conf;
size_t max_hmux_data_packet_size_conf;
ngx_flag_t hmux_set_header_x_forwarded_for;
ngx_array_t *hmux_lengths;
ngx_array_t *hmux_values;
ngx_http_upstream_conf_t upstream;
#if (NGX_HTTP_CACHE)
ngx_http_complex_value_t cache_key;
#endif
} ngx_hmux_loc_conf_t;
typedef enum {
ngx_hmux_st_init_state = 0,
ngx_hmux_st_forward_request_sent,
ngx_hmux_st_request_body_data_sending,
ngx_hmux_st_request_send_all_done,
ngx_hmux_st_response_recv_headers,
ngx_hmux_st_response_parse_headers_done,
ngx_hmux_st_response_headers_sent,
ngx_hmux_st_response_body_data_sending,
ngx_hmux_st_response_end
} ngx_hmux_state_e;
typedef struct {
hmux_msg_t msg;
ngx_hmux_state_e state;
/*
* this is for fixing the problem
* when request content length is not equal to content-length
*/
off_t req_body_send_len;
off_t req_body_len;
/* request body which has not been sent to the backend */
ngx_chain_t *req_body;
/* buffer for Long POST disposure */
ngx_chain_t *resp_body;
/* for input filter disposure */
void *undisposed;
size_t undisposed_size;
/* the response body chunk packet's length */
size_t resp_chunk_len;
unsigned int req_body_sent_over:1;
unsigned int head_send_flag:1;
unsigned int long_post_flag:1;
unsigned int flush_flag:1;
unsigned int restore_flag:1;
unsigned int code:8;
unsigned int mend_flag:8;
} ngx_hmux_ctx_t;
#if (NGX_HTTP_CACHE)
static ngx_int_t ngx_hmux_create_key(ngx_http_request_t *r);
#endif
static ngx_int_t ngx_hmux_eval(ngx_http_request_t *r,
ngx_hmux_loc_conf_t *hlcf);
static ngx_int_t ngx_hmux_create_request(ngx_http_request_t *r);
static ngx_int_t ngx_hmux_reinit_request(ngx_http_request_t *r);
static ngx_int_t ngx_hmux_process_header(ngx_http_request_t *r);
static ngx_int_t ngx_hmux_input_filter(ngx_event_pipe_t *p,
ngx_buf_t *buf);
static void ngx_hmux_abort_request(ngx_http_request_t *r);
static void ngx_hmux_finalize_request(ngx_http_request_t *r,
ngx_int_t rc);
static ngx_int_t ngx_http_upstream_send_request_body(ngx_http_request_t *r,
ngx_http_upstream_t *u);
static ngx_chain_t *hmux_data_msg_send_body(ngx_http_request_t *r,
size_t max_size, ngx_chain_t **body);
static void ngx_http_upstream_send_request_body_handler(ngx_http_request_t *r,
ngx_http_upstream_t *u);
static void ngx_http_upstream_dummy_handler(ngx_http_request_t *r,
ngx_http_upstream_t *u);
#if (NGX_HTTP_CACHE)
static char *ngx_hmux_cache(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static char *ngx_hmux_cache_key(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
#endif
static char *ngx_hmux_pass(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static char *ngx_hmux_store(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static char *ngx_hmux_lowat_check(ngx_conf_t *cf, void *post,
void *data);
static char *ngx_hmux_upstream_max_fails_unsupported(ngx_conf_t *cf,
ngx_command_t *cmd, void *conf);
static char *ngx_hmux_upstream_fail_timeout_unsupported(ngx_conf_t *cf,
ngx_command_t *cmd, void *conf);
static ngx_int_t ngx_hmux_get_x_forwarded_for_value(ngx_http_request_t *r,
ngx_str_t *v, uintptr_t data);
static void *ngx_hmux_create_loc_conf(ngx_conf_t *cf);
static char *ngx_hmux_merge_loc_conf(ngx_conf_t *cf, void *parent,
void *child);
static int hmux_log_overflow(ngx_uint_t level, hmux_msg_t *msg,
const char *context);
/*
* protocol functions
*/
static ngx_int_t hmux_start_channel(hmux_msg_t *msg,
unsigned short channel);
static ngx_int_t hmux_write_string(hmux_msg_t *msg,
char code, ngx_str_t *value);
static ngx_int_t hmux_read_len(hmux_msg_t *msg, uint16_t *rlen);
static ngx_int_t hmux_read_byte(hmux_msg_t *s, u_char *rvalue);
static ngx_int_t hmux_read_string(hmux_msg_t *msg, ngx_str_t *rvalue);
static hmux_msg_t *hmux_msg_reuse(hmux_msg_t *msg);
static ngx_int_t hmux_data_msg_begin(hmux_msg_t *msg, size_t size);
static ngx_chain_t *hmux_cmd_msg(ngx_hmux_ctx_t *ctx, ngx_http_request_t *r,
u_char code);
static ngx_int_t hmux_msg_create_buffer(ngx_pool_t *pool, size_t size,
hmux_msg_t *msg);
static ngx_int_t hmux_marshal_into_msg(hmux_msg_t *msg,
ngx_http_request_t *r, ngx_hmux_loc_conf_t *hlcf);
static ngx_int_t hmux_unmarshal_response(hmux_msg_t *msg,
ngx_http_request_t *r, ngx_hmux_loc_conf_t *hlcf);
static ngx_conf_post_t ngx_hmux_lowat_post = { ngx_hmux_lowat_check };
static ngx_conf_bitmask_t ngx_hmux_next_upstream_masks[] = {
{ ngx_string("error"), NGX_HTTP_UPSTREAM_FT_ERROR },
{ ngx_string("timeout"), NGX_HTTP_UPSTREAM_FT_TIMEOUT },
{ ngx_string("invalid_header"), NGX_HTTP_UPSTREAM_FT_INVALID_HEADER },
{ ngx_string("http_500"), NGX_HTTP_UPSTREAM_FT_HTTP_500 },
{ ngx_string("http_502"), NGX_HTTP_UPSTREAM_FT_HTTP_502 },
{ ngx_string("http_503"), NGX_HTTP_UPSTREAM_FT_HTTP_503 },
{ ngx_string("http_504"), NGX_HTTP_UPSTREAM_FT_HTTP_504 },
{ ngx_string("http_404"), NGX_HTTP_UPSTREAM_FT_HTTP_404 },
{ ngx_string("updating"), NGX_HTTP_UPSTREAM_FT_UPDATING },
{ ngx_string("off"), NGX_HTTP_UPSTREAM_FT_OFF },
{ ngx_null_string, 0 }
};
static ngx_conf_bitmask_t ngx_hmux_ignore_headers_masks[] = {
{ ngx_string("X-Accel-Redirect"), NGX_HTTP_UPSTREAM_IGN_XA_REDIRECT },
{ ngx_string("X-Accel-Expires"), NGX_HTTP_UPSTREAM_IGN_XA_EXPIRES },
{ ngx_string("Expires"), NGX_HTTP_UPSTREAM_IGN_EXPIRES },
{ ngx_string("Cache-Control"), NGX_HTTP_UPSTREAM_IGN_CACHE_CONTROL },
{ ngx_null_string, 0 }
};
static ngx_path_init_t ngx_hmux_temp_path = {
ngx_string("hmux_temp"), { 1, 2, 0 }
};
static ngx_str_t ngx_hmux_hide_headers[] = {
ngx_string("Status"),
ngx_string("X-Accel-Expires"),
ngx_string("X-Accel-Redirect"),
ngx_string("X-Accel-Limit-Rate"),
ngx_string("X-Accel-Buffering"),
ngx_string("X-Accel-Charset"),
ngx_null_string
};
#if (NGX_HTTP_CACHE)
static ngx_str_t ngx_hmux_hide_cache_headers[] = {
ngx_string("Status"),
ngx_string("X-Accel-Expires"),
ngx_string("X-Accel-Redirect"),
ngx_string("X-Accel-Limit-Rate"),
ngx_string("X-Accel-Buffering"),
ngx_string("X-Accel-Charset"),
ngx_string("Set-Cookie"),
ngx_string("P3P"),
ngx_null_string
};
#endif
static ngx_command_t ngx_hmux_commands[] = {
{ ngx_string("hmux_pass"),
NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF|NGX_CONF_TAKE1,
ngx_hmux_pass,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
{ ngx_string("hmux_header_packet_buffer_size"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_conf_set_size_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_hmux_loc_conf_t, hmux_header_packet_buffer_size_conf),
NULL },
{ ngx_string("hmux_max_data_packet_size"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_conf_set_str_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_hmux_loc_conf_t, max_hmux_data_packet_size_conf),
NULL },
{ ngx_string("hmux_store"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_hmux_store,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
{ ngx_string("hmux_store_access"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE123,
ngx_conf_set_access_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_hmux_loc_conf_t, upstream.store_access),
NULL },
{ ngx_string("hmux_ignore_client_abort"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
ngx_conf_set_flag_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_hmux_loc_conf_t, upstream.ignore_client_abort),
NULL },
{ ngx_string("hmux_connect_timeout"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_conf_set_msec_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_hmux_loc_conf_t, upstream.connect_timeout),
NULL },
{ ngx_string("hmux_send_timeout"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_conf_set_msec_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_hmux_loc_conf_t, upstream.send_timeout),
NULL },
{ ngx_string("hmux_send_lowat"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_conf_set_size_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_hmux_loc_conf_t, upstream.send_lowat),
&ngx_hmux_lowat_post },
{ ngx_string("hmux_buffer_size"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_conf_set_size_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_hmux_loc_conf_t, upstream.buffer_size),
NULL },
{ ngx_string("hmux_pass_request_headers"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
ngx_conf_set_flag_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_hmux_loc_conf_t, upstream.pass_request_headers),
NULL },
{ ngx_string("hmux_pass_request_body"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
ngx_conf_set_flag_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_hmux_loc_conf_t, upstream.pass_request_body),
NULL },
{ ngx_string("hmux_intercept_errors"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
ngx_conf_set_flag_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_hmux_loc_conf_t, upstream.intercept_errors),
NULL },
{ ngx_string("hmux_read_timeout"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_conf_set_msec_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_hmux_loc_conf_t, upstream.read_timeout),
NULL },
{ ngx_string("hmux_buffers"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2,
ngx_conf_set_bufs_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_hmux_loc_conf_t, upstream.bufs),
NULL },
{ ngx_string("hmux_busy_buffers_size"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_conf_set_size_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_hmux_loc_conf_t, upstream.busy_buffers_size_conf),
NULL },
#if (NGX_HTTP_CACHE)
{ ngx_string("hmux_cache"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
ngx_hmux_cache,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
{ ngx_string("hmux_cache_key"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
ngx_hmux_cache_key,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
{ ngx_string("hmux_cache_path"),
NGX_HTTP_MAIN_CONF|NGX_CONF_2MORE,
ngx_http_file_cache_set_slot,
0,
0,
&ngx_hmux_module },
{ ngx_string("hmux_cache_valid"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
ngx_http_file_cache_valid_set_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_hmux_loc_conf_t, upstream.cache_valid),
NULL },
{ ngx_string("hmux_cache_min_uses"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_conf_set_num_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_hmux_loc_conf_t, upstream.cache_min_uses),
NULL },
{ ngx_string("hmux_cache_use_stale"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
ngx_conf_set_bitmask_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_hmux_loc_conf_t, upstream.cache_use_stale),
&ngx_hmux_next_upstream_masks },
{ ngx_string("hmux_cache_methods"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
ngx_conf_set_bitmask_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_hmux_loc_conf_t, upstream.cache_methods),
&ngx_http_upstream_cache_method_mask },
#endif
{ ngx_string("hmux_temp_path"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1234,
ngx_conf_set_path_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_hmux_loc_conf_t, upstream.temp_path),
NULL },
{ ngx_string("hmux_max_temp_file_size"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_conf_set_size_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_hmux_loc_conf_t, upstream.max_temp_file_size_conf),
NULL },
{ ngx_string("hmux_temp_file_write_size"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_conf_set_size_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_hmux_loc_conf_t, upstream.temp_file_write_size_conf),
NULL },
{ ngx_string("hmux_next_upstream"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
ngx_conf_set_bitmask_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_hmux_loc_conf_t, upstream.next_upstream),
&ngx_hmux_next_upstream_masks },
{ ngx_string("hmux_upstream_max_fails"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_hmux_upstream_max_fails_unsupported,
0,
0,
NULL },
{ ngx_string("hmux_upstream_fail_timeout"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_hmux_upstream_fail_timeout_unsupported,
0,
0,
NULL },
{ ngx_string("hmux_pass_header"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
ngx_conf_set_str_array_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_hmux_loc_conf_t, upstream.pass_headers),
NULL },
{ ngx_string("hmux_hide_header"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
ngx_conf_set_str_array_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_hmux_loc_conf_t, upstream.hide_headers),
NULL },
{ ngx_string("hmux_ignore_headers"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
ngx_conf_set_bitmask_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_hmux_loc_conf_t, upstream.ignore_headers),
&ngx_hmux_ignore_headers_masks },
{ ngx_string("hmux_x_forwarded_for"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
ngx_conf_set_flag_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_hmux_loc_conf_t, hmux_set_header_x_forwarded_for),
NULL },
ngx_null_command
};
static ngx_http_module_t ngx_hmux_module_ctx = {
NULL, /* preconfiguration */
NULL, /* postconfiguration */
NULL, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
ngx_hmux_create_loc_conf, /* create location configuration */
ngx_hmux_merge_loc_conf /* merge location configuration */
};
ngx_module_t ngx_hmux_module = {
NGX_MODULE_V1,
&ngx_hmux_module_ctx, /* module context */
ngx_hmux_commands, /* module directives */
NGX_HTTP_MODULE, /* module type */
NULL, /* init master */
NULL, /* init module */
NULL, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};
ngx_int_t
ngx_hmux_handler(ngx_http_request_t *r)
{
ngx_int_t rc;
ngx_http_upstream_t *u;
ngx_hmux_ctx_t *ctx;
ngx_hmux_loc_conf_t *hlcf;
if (r->subrequest_in_memory) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"ngx_hmux_module does not support "
"subrequest in memory");
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
if (ngx_http_set_content_type(r) != NGX_OK) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
if (ngx_http_upstream_create(r) != NGX_OK) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
ctx = ngx_pcalloc(r->pool, sizeof(ngx_hmux_ctx_t));
if (NULL == ctx) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
if (r->headers_in.content_length_n > 0){
ctx->req_body_len=r->headers_in.content_length_n;
}
ctx->state = ngx_hmux_st_init_state;
ngx_http_set_ctx(r, ctx, ngx_hmux_module);
hlcf = ngx_http_get_module_loc_conf(r, ngx_hmux_module);
if (hlcf->hmux_lengths) {
if (ngx_hmux_eval(r, hlcf) != NGX_OK) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
}
u = r->upstream;
u->schema.len = sizeof("hmux://") - 1;
u->schema.data = (u_char *) "hmux://";
u->output.tag = (ngx_buf_tag_t) &ngx_hmux_module;
u->conf = &hlcf->upstream;
#if (NGX_HTTP_CACHE)
u->create_key = ngx_hmux_create_key;
#endif
u->create_request = ngx_hmux_create_request;
u->reinit_request = ngx_hmux_reinit_request;
u->process_header = ngx_hmux_process_header;
u->abort_request = ngx_hmux_abort_request;
u->finalize_request = ngx_hmux_finalize_request;
u->buffering = 1;
u->pipe = ngx_pcalloc(r->pool, sizeof(ngx_event_pipe_t));
if (NULL == u->pipe) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
u->pipe->input_filter = ngx_hmux_input_filter;
u->pipe->input_ctx = r;
rc = ngx_http_read_client_request_body(r, ngx_http_upstream_init);
if (rc >= NGX_HTTP_SPECIAL_RESPONSE) {
return rc;
}
return NGX_DONE;
}
static ngx_int_t
ngx_hmux_eval(ngx_http_request_t *r, ngx_hmux_loc_conf_t *hlcf)
{
ngx_url_t u;
ngx_memzero(&u, sizeof(ngx_url_t));
if (ngx_http_script_run(r, &u.url, hlcf->hmux_lengths->elts, 0,
hlcf->hmux_values->elts) == NULL)
{
return NGX_ERROR;
}
u.no_resolve = 1;
if (ngx_parse_url(r->pool, &u) != NGX_OK) {
if (u.err) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"%s in upstream \"%V\"", u.err, &u.url);
}
return NGX_ERROR;
}
if (u.no_port) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"no port in upstream \"%V\"", &u.url);
return NGX_ERROR;
}
r->upstream->resolved = ngx_pcalloc(r->pool,
sizeof(ngx_http_upstream_resolved_t));
if (NULL == r->upstream->resolved ) {
return NGX_ERROR;
}
if (u.addrs && u.addrs[0].sockaddr) {
r->upstream->resolved->sockaddr = u.addrs[0].sockaddr;
r->upstream->resolved->socklen = u.addrs[0].socklen;
r->upstream->resolved->naddrs = 1;
r->upstream->resolved->host = u.addrs[0].name;
} else {
r->upstream->resolved->host = u.host;
r->upstream->resolved->port = u.port;
}
return NGX_OK;
}
#if (NGX_HTTP_CACHE)
static ngx_int_t
ngx_hmux_create_key(ngx_http_request_t *r)
{
ngx_str_t *key;
ngx_hmux_loc_conf_t *hlcf;
key = ngx_array_push(&r->cache->keys);
if (NULL == key) {
return NGX_ERROR;
}
hlcf = ngx_http_get_module_loc_conf(r, ngx_hmux_module);
if (ngx_http_complex_value(r, &hlcf->cache_key, key) != NGX_OK) {
return NGX_ERROR;
}
return NGX_OK;
}
#endif
static ngx_int_t
ngx_hmux_create_request(ngx_http_request_t *r)
{
ngx_int_t rc;
hmux_msg_t *msg;
ngx_chain_t *cl, *last;
ngx_hmux_ctx_t *ctx;
ngx_hmux_loc_conf_t *hlcf;
ctx = ngx_http_get_module_ctx(r, ngx_hmux_module);
hlcf = ngx_http_get_module_loc_conf(r, ngx_hmux_module);
if (NULL == ctx || NULL == hlcf) {
return NGX_ERROR;
}
msg = hmux_msg_reuse(&ctx->msg);
/* creates buffer for header */
if (NGX_OK != hmux_msg_create_buffer(r->pool,
hlcf->hmux_header_packet_buffer_size_conf, msg)) {
return NGX_ERROR;
}
rc = hmux_marshal_into_msg(msg, r, hlcf);
if (NGX_OK != rc) {
ngx_log_error(NGX_LOG_WARN, r->connection->log, 0,
"hmux_header_packet_buffer_size is too small:%u",
hlcf->hmux_header_packet_buffer_size_conf);
return rc;
}
cl = ngx_alloc_chain_link(r->pool);
if (NULL == cl) {
return NGX_ERROR;
}
cl->buf = msg->buf;
cl->buf->flush = 1;
ctx->state = ngx_hmux_st_forward_request_sent;
if (hlcf->upstream.pass_request_body) {
ctx->req_body = r->upstream->request_bufs;
r->upstream->request_bufs = cl;
cl->next = hmux_data_msg_send_body(r,
hlcf->max_hmux_data_packet_size_conf, &ctx->req_body);
last = cl;
while (last->next != NULL){
last = last->next;
}
if (ctx->req_body != NULL && !ctx->req_body_sent_over) {
/* it has body data left for sending */
ctx->state = ngx_hmux_st_request_body_data_sending;
last->next = hmux_cmd_msg(ctx, r, HMUX_YIELD);
} else {
ctx->state = ngx_hmux_st_request_send_all_done;
last->next = hmux_cmd_msg(ctx, r, HMUX_QUIT);
}
} else {
ctx->req_body_sent_over = 1;
ctx->state = ngx_hmux_st_request_send_all_done;
r->upstream->request_bufs = cl;
cl->next = hmux_cmd_msg(ctx, r, HMUX_QUIT);
}
return NGX_OK;
}
static ngx_int_t
ngx_hmux_reinit_request(ngx_http_request_t *r)
{
ngx_hmux_ctx_t *ctx;
ngx_hmux_loc_conf_t *hlcf;
ctx = ngx_http_get_module_ctx(r, ngx_hmux_module);
hlcf = ngx_http_get_module_loc_conf(r, ngx_hmux_module);
if (NULL == ctx || NULL== hlcf) {
return NGX_ERROR;
}
memset(ctx, 0, sizeof(ngx_hmux_ctx_t));
ctx->state = ngx_hmux_st_init_state;
hmux_msg_reuse(&ctx->msg);
return NGX_OK;
}
static ngx_int_t
ngx_hmux_process_header(ngx_http_request_t *r)
{
ngx_hmux_ctx_t *ctx;
ngx_hmux_loc_conf_t *hlcf;
ctx = ngx_http_get_module_ctx(r, ngx_hmux_module);
hlcf = ngx_http_get_module_loc_conf(r, ngx_hmux_module);
if (NULL == ctx || NULL == hlcf) {
return NGX_ERROR;
}
ngx_log_error(NGX_LOG_DEBUG, r->connection->log, 0,
"ngx_hmux_process_header: state(%d)", ctx->state);
return hmux_unmarshal_response(&ctx->msg, r, hlcf);
}
static ngx_int_t
ngx_http_upstream_send_request_body(ngx_http_request_t *r,
ngx_http_upstream_t *u)
{
ngx_int_t rc;
ngx_chain_t *cl, *last;
hmux_msg_t *msg;
ngx_connection_t *c;
ngx_hmux_ctx_t *ctx;
ngx_hmux_loc_conf_t *hlcf;
c = u->peer.connection;
ctx = ngx_http_get_module_ctx(r, ngx_hmux_module);
hlcf = ngx_http_get_module_loc_conf(r, ngx_hmux_module);
if (NULL == ctx || NULL == hlcf)
{
return NGX_ERROR;
}
if (ctx->state > ngx_hmux_st_request_body_data_sending) {
ngx_log_error(NGX_LOG_WARN, r->connection->log, 0,
"ngx_http_upstream_send_request_body: bad state(%d)",
ctx->state);
}
cl = hmux_data_msg_send_body(r, hlcf->max_hmux_data_packet_size_conf,
&ctx->req_body);
if (NULL == u->output.in && NULL == u->output.busy) {
if (NULL == cl) {
msg = hmux_msg_reuse(&ctx->msg);
hmux_data_msg_begin(msg, 0);
cl = ngx_alloc_chain_link(r->pool);
if (NULL == cl ) {
return NGX_ERROR;
}
cl->buf = msg->buf;
cl->next = NULL;
}
}
last = cl;
while (last->next != NULL){
last = last->next;
}
if (ctx->req_body != NULL && !ctx->req_body_sent_over) {
ctx->state = ngx_hmux_st_request_body_data_sending;
last->next = hmux_cmd_msg(ctx, r, HMUX_YIELD);
}
else {
last->next = hmux_cmd_msg(ctx, r, HMUX_QUIT);
ctx->state = ngx_hmux_st_request_send_all_done;
}
c->log->action = "sending request body again to upstream";
rc = ngx_output_chain(&u->output, cl);
if (NGX_ERROR == rc) {
return NGX_ERROR;
}
if (c->write->timer_set) {
ngx_del_timer(c->write);
}
if (rc == NGX_AGAIN) {
ngx_add_timer(c->write, u->conf->send_timeout);
if (ngx_handle_write_event(c->write, u->conf->send_lowat) != NGX_OK) {
return NGX_ERROR;
}
u->write_event_handler = ngx_http_upstream_send_request_body_handler;
return NGX_AGAIN;
}
if (NGX_TCP_NOPUSH_SET == c->tcp_nopush) {
if (NGX_ERROR == ngx_tcp_push(c->fd)) {
ngx_log_error(NGX_LOG_CRIT, c->log, ngx_socket_errno,
ngx_tcp_push_n " failed");
return NGX_ERROR;
}
c->tcp_nopush = NGX_TCP_NOPUSH_UNSET;
}
ngx_add_timer(c->read, u->conf->read_timeout);
if (ngx_handle_write_event(c->write, 0) != NGX_OK) {
return NGX_ERROR;
}
u->write_event_handler = ngx_http_upstream_dummy_handler;
return NGX_OK;
}
ngx_chain_t *
hmux_data_msg_send_body(ngx_http_request_t *r, size_t max_size,
ngx_chain_t **body)
{
size_t size, actual_size, base_size,
added_size, redundant_size;
ngx_int_t rc;
ngx_buf_t *b_in, *b_out;
ngx_chain_t *out, *cl, *in;
hmux_msg_t *msg;
ngx_hmux_ctx_t *ctx;
ctx = ngx_http_get_module_ctx(r, ngx_hmux_module);
if (NULL == body || NULL == *body || NULL == ctx) {
return NULL;