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/* Copyright (C) agentzh */
#define DDEBUG 0
#include "ddebug.h"
#include <ngx_config.h>
#include "ngx_http_chunkin_util.h"
#include "ngx_http_chunkin_filter_module.h"
#include "ngx_http_chunkin_request_body.h"
enum {
DEFAULT_MAX_CHUNKS_PER_BUF = 512
};
static ngx_int_t ngx_http_chunkin_resume_handler(ngx_http_request_t *r);
static char* ngx_http_chunkin_resume(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static void *ngx_http_chunkin_create_conf(ngx_conf_t *cf);
static char *ngx_http_chunkin_merge_conf(ngx_conf_t *cf, void *parent,
void *child);
static ngx_int_t ngx_http_chunkin_handler(ngx_http_request_t *r);
static ngx_int_t ngx_http_chunkin_init(ngx_conf_t *cf);
static void ngx_http_chunkin_post_read(ngx_http_request_t *r);
static ngx_command_t ngx_http_chunkin_commands[] = {
{ ngx_string("chunkin"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_FLAG,
ngx_conf_set_flag_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_chunkin_conf_t, enabled),
NULL },
{ ngx_string("chunkin_max_chunks_per_buf"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
ngx_conf_set_num_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_chunkin_conf_t, max_chunks_per_buf),
NULL },
{ ngx_string("chunkin_resume"),
NGX_HTTP_LOC_CONF|NGX_CONF_NOARGS,
ngx_http_chunkin_resume,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
{ ngx_string("chunkin_keepalive"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF
|NGX_HTTP_LIF_CONF|NGX_CONF_FLAG,
ngx_conf_set_flag_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_chunkin_conf_t, keepalive),
NULL },
ngx_null_command
};
static ngx_http_module_t ngx_http_chunkin_filter_module_ctx = {
NULL, /* preconfiguration */
ngx_http_chunkin_init, /* postconfiguration */
NULL, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
ngx_http_chunkin_create_conf, /* create location configuration */
ngx_http_chunkin_merge_conf /* merge location configuration */
};
ngx_module_t ngx_http_chunkin_filter_module = {
NGX_MODULE_V1,
&ngx_http_chunkin_filter_module_ctx, /* module context */
ngx_http_chunkin_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
};
static void *
ngx_http_chunkin_create_conf(ngx_conf_t *cf)
{
ngx_http_chunkin_conf_t *conf;
conf = ngx_palloc(cf->pool, sizeof(ngx_http_chunkin_conf_t));
if (conf == NULL) {
return NULL;
}
conf->enabled = NGX_CONF_UNSET;
conf->keepalive = NGX_CONF_UNSET;
conf->max_chunks_per_buf = NGX_CONF_UNSET_UINT;
return conf;
}
static char *
ngx_http_chunkin_merge_conf(ngx_conf_t *cf, void *parent, void *child)
{
ngx_http_chunkin_conf_t *prev = parent;
ngx_http_chunkin_conf_t *conf = child;
ngx_conf_merge_value(conf->enabled, prev->enabled, 0);
ngx_conf_merge_value(conf->keepalive, prev->keepalive, 0);
ngx_conf_merge_uint_value(conf->max_chunks_per_buf,
prev->max_chunks_per_buf,
DEFAULT_MAX_CHUNKS_PER_BUF);
return NGX_CONF_OK;
}
static ngx_flag_t
ngx_http_chunkin_is_chunked_encoding(ngx_http_request_t *r)
{
dd("is chunked encoding...");
return r->headers_in.transfer_encoding &&
r->headers_in.transfer_encoding->value.len >= 7 &&
ngx_strcasestrn(r->headers_in.transfer_encoding->value.data,
"chunked", 7 - 1);
}
static ngx_int_t
ngx_http_chunkin_init(ngx_conf_t *cf)
{
ngx_http_handler_pt *h;
ngx_http_core_main_conf_t *cmcf;
cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
h = ngx_array_push(&cmcf->phases[NGX_HTTP_ACCESS_PHASE].handlers);
if (h == NULL) {
return NGX_ERROR;
}
*h = ngx_http_chunkin_handler;
return NGX_OK;
}
static ngx_int_t
ngx_http_chunkin_handler(ngx_http_request_t *r)
{
ngx_http_chunkin_ctx_t *ctx;
ngx_http_chunkin_conf_t *conf;
ngx_int_t rc;
dd("entered chunkin handler...");
conf = ngx_http_get_module_loc_conf(r, ngx_http_chunkin_filter_module);
if (!conf->enabled || r != r->main) {
dd("conf not enabled: %d", (int) conf->enabled);
return NGX_DECLINED;
}
ctx = ngx_http_get_module_ctx(r, ngx_http_chunkin_filter_module);
if (ctx == NULL) {
dd("ctx not found");
return NGX_DECLINED;
}
if (ctx->done) {
return NGX_DECLINED;
}
if (ctx->waiting_more_body) {
return NGX_AGAIN;
}
dd("reading chunked input eagerly...");
if (!conf->keepalive && r->keepalive) {
dd("dis-enabling r->keepalive...");
r->keepalive = 0;
}
dd_check_read_event_handler(r);
dd_check_write_event_handler(r);
/*
rc = ngx_http_read_client_request_body(r,
ngx_http_chunkin_post_read);
*/
ngx_http_chunkin_clear_transfer_encoding(r);
r->header_in->pos = r->header_end + sizeof(CRLF) - 1;
if (r->header_in->pos > r->header_in->last) {
ngx_log_error(NGX_LOG_INFO, r->connection->log, 0,
"chunkin: r->header_in->pos overflown");
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
if (*(r->header_in->pos - 2) != CR || *(r->header_in->pos - 1) != LF) {
ngx_log_error(NGX_LOG_INFO, r->connection->log, 0,
"chunkin: r->header_in->pos not lead by CRLF");
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
dd("chunkin handler: header_in->pos: %d",
(int)(r->header_in->pos - r->header_in->start));
rc = ngx_http_chunkin_read_chunked_request_body(r,
ngx_http_chunkin_post_read);
if (rc >= NGX_HTTP_SPECIAL_RESPONSE) {
dd("read client request body returned special response %d", (int) rc);
return rc;
}
dd("read client request body returned %d", (int) rc);
if (rc == NGX_AGAIN) {
ctx->waiting_more_body = 1;
return NGX_AGAIN;
}
ctx->done = 1;
return NGX_DECLINED;
}
static void
ngx_http_chunkin_post_read(ngx_http_request_t *r)
{
ngx_http_chunkin_ctx_t *ctx;
dd("post read");
dd_check_read_event_handler(r);
dd_check_write_event_handler(r);
r->read_event_handler = ngx_http_block_reading;
ctx = ngx_http_get_module_ctx(r, ngx_http_chunkin_filter_module);
ctx->done = 1;
if (ctx->waiting_more_body) {
ctx->waiting_more_body = 0;
ngx_http_core_run_phases(r);
}
}
static char* ngx_http_chunkin_resume(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf)
{
ngx_http_core_loc_conf_t *clcf;
clcf = ngx_http_conf_get_module_loc_conf(cf,
ngx_http_core_module);
clcf->handler = ngx_http_chunkin_resume_handler;
return NGX_CONF_OK;
}
static ngx_int_t
ngx_http_chunkin_resume_handler(ngx_http_request_t *r) {
ngx_int_t rc;
ngx_http_chunkin_conf_t *conf;
ngx_http_chunkin_ctx_t *ctx;
conf = ngx_http_get_module_loc_conf(r, ngx_http_chunkin_filter_module);
dd("method: %.*s (%d)", (int) r->method_name.len, r->method_name.data,
(int) r->method);
if (!conf->enabled || r != r->main
|| (r->method != NGX_HTTP_PUT && r->method != NGX_HTTP_POST &&
r->method != NGX_HTTP_DELETE))
{
dd("conf not enabled or in subrequest or not POST nor PUT requests");
return NGX_HTTP_LENGTH_REQUIRED;
}
if (r->method == NGX_HTTP_POST &&
! ngx_http_chunkin_is_chunked_encoding(r->main))
{
dd("found POST request, but not chunked");
return NGX_HTTP_LENGTH_REQUIRED;
}
dd("chunked request test passed");
/* XXX just to fool the nginx core */
r->headers_in.content_length_n = 1;
ngx_http_chunkin_clear_transfer_encoding(r);
ctx = ngx_http_get_module_ctx(r, ngx_http_chunkin_filter_module);
if (ctx == NULL) {
ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_chunkin_ctx_t));
if (ctx == NULL) {
return NGX_ERROR;
}
/* ctx->ignore_body is set to 0 */
}
r->discard_body = 0;
r->error_page = 0;
r->err_status = 0;
#if 0
r->method = NGX_HTTP_PUT;
r->headers_in.content_length = NULL;
r->headers_in.content_length_n = -1;
#endif
rc = ngx_http_chunkin_process_request_header(r);
if (rc != NGX_OK) {
return rc;
}
#if 0
r->plain_http = 1;
#endif
rc = ngx_http_chunkin_process_request(r);
if (rc != NGX_OK) {
return rc;
}
return ngx_http_chunkin_internal_redirect(r, &r->main->uri, &r->main->args,
ctx);
}
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