Mercurial > hg > nginx
view src/http/modules/ngx_http_mirror_module.c @ 7678:bffcc5af1d72
Upstream: drop extra data sent by upstream.
Previous behaviour was to pass everything to the client, but this
seems to be suboptimal and causes issues (ticket #1695). Fix is to
drop extra data instead, as it naturally happens in most clients.
This change covers generic buffered and unbuffered filters as used
in the scgi and uwsgi modules. Appropriate input filter init
handlers are provided by the scgi and uwsgi modules to set corresponding
lengths.
Note that for responses to HEAD requests there is an exception:
we do allow any response length. This is because responses to HEAD
requests might be actual full responses, and it is up to nginx
to remove the response body. If caching is enabled, only full
responses matching the Content-Length header will be cached
(see b779728b180c).
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Mon, 06 Jul 2020 18:36:22 +0300 |
parents | 230d16d35ebc |
children |
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/* * Copyright (C) Roman Arutyunyan * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_http.h> typedef struct { ngx_array_t *mirror; ngx_flag_t request_body; } ngx_http_mirror_loc_conf_t; typedef struct { ngx_int_t status; } ngx_http_mirror_ctx_t; static ngx_int_t ngx_http_mirror_handler(ngx_http_request_t *r); static void ngx_http_mirror_body_handler(ngx_http_request_t *r); static ngx_int_t ngx_http_mirror_handler_internal(ngx_http_request_t *r); static void *ngx_http_mirror_create_loc_conf(ngx_conf_t *cf); static char *ngx_http_mirror_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child); static char *ngx_http_mirror(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static ngx_int_t ngx_http_mirror_init(ngx_conf_t *cf); static ngx_command_t ngx_http_mirror_commands[] = { { ngx_string("mirror"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, ngx_http_mirror, NGX_HTTP_LOC_CONF_OFFSET, 0, NULL }, { ngx_string("mirror_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_http_mirror_loc_conf_t, request_body), NULL }, ngx_null_command }; static ngx_http_module_t ngx_http_mirror_module_ctx = { NULL, /* preconfiguration */ ngx_http_mirror_init, /* postconfiguration */ NULL, /* create main configuration */ NULL, /* init main configuration */ NULL, /* create server configuration */ NULL, /* merge server configuration */ ngx_http_mirror_create_loc_conf, /* create location configuration */ ngx_http_mirror_merge_loc_conf /* merge location configuration */ }; ngx_module_t ngx_http_mirror_module = { NGX_MODULE_V1, &ngx_http_mirror_module_ctx, /* module context */ ngx_http_mirror_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 ngx_int_t ngx_http_mirror_handler(ngx_http_request_t *r) { ngx_int_t rc; ngx_http_mirror_ctx_t *ctx; ngx_http_mirror_loc_conf_t *mlcf; if (r != r->main) { return NGX_DECLINED; } mlcf = ngx_http_get_module_loc_conf(r, ngx_http_mirror_module); if (mlcf->mirror == NULL) { return NGX_DECLINED; } ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "mirror handler"); if (mlcf->request_body) { ctx = ngx_http_get_module_ctx(r, ngx_http_mirror_module); if (ctx) { return ctx->status; } ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_mirror_ctx_t)); if (ctx == NULL) { return NGX_ERROR; } ctx->status = NGX_DONE; ngx_http_set_ctx(r, ctx, ngx_http_mirror_module); rc = ngx_http_read_client_request_body(r, ngx_http_mirror_body_handler); if (rc >= NGX_HTTP_SPECIAL_RESPONSE) { return rc; } ngx_http_finalize_request(r, NGX_DONE); return NGX_DONE; } return ngx_http_mirror_handler_internal(r); } static void ngx_http_mirror_body_handler(ngx_http_request_t *r) { ngx_http_mirror_ctx_t *ctx; ctx = ngx_http_get_module_ctx(r, ngx_http_mirror_module); ctx->status = ngx_http_mirror_handler_internal(r); r->preserve_body = 1; r->write_event_handler = ngx_http_core_run_phases; ngx_http_core_run_phases(r); } static ngx_int_t ngx_http_mirror_handler_internal(ngx_http_request_t *r) { ngx_str_t *name; ngx_uint_t i; ngx_http_request_t *sr; ngx_http_mirror_loc_conf_t *mlcf; mlcf = ngx_http_get_module_loc_conf(r, ngx_http_mirror_module); name = mlcf->mirror->elts; for (i = 0; i < mlcf->mirror->nelts; i++) { if (ngx_http_subrequest(r, &name[i], &r->args, &sr, NULL, NGX_HTTP_SUBREQUEST_BACKGROUND) != NGX_OK) { return NGX_HTTP_INTERNAL_SERVER_ERROR; } sr->header_only = 1; sr->method = r->method; sr->method_name = r->method_name; } return NGX_DECLINED; } static void * ngx_http_mirror_create_loc_conf(ngx_conf_t *cf) { ngx_http_mirror_loc_conf_t *mlcf; mlcf = ngx_pcalloc(cf->pool, sizeof(ngx_http_mirror_loc_conf_t)); if (mlcf == NULL) { return NULL; } mlcf->mirror = NGX_CONF_UNSET_PTR; mlcf->request_body = NGX_CONF_UNSET; return mlcf; } static char * ngx_http_mirror_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child) { ngx_http_mirror_loc_conf_t *prev = parent; ngx_http_mirror_loc_conf_t *conf = child; ngx_conf_merge_ptr_value(conf->mirror, prev->mirror, NULL); ngx_conf_merge_value(conf->request_body, prev->request_body, 1); return NGX_CONF_OK; } static char * ngx_http_mirror(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ngx_http_mirror_loc_conf_t *mlcf = conf; ngx_str_t *value, *s; value = cf->args->elts; if (ngx_strcmp(value[1].data, "off") == 0) { if (mlcf->mirror != NGX_CONF_UNSET_PTR) { return "is duplicate"; } mlcf->mirror = NULL; return NGX_CONF_OK; } if (mlcf->mirror == NULL) { return "is duplicate"; } if (mlcf->mirror == NGX_CONF_UNSET_PTR) { mlcf->mirror = ngx_array_create(cf->pool, 4, sizeof(ngx_str_t)); if (mlcf->mirror == NULL) { return NGX_CONF_ERROR; } } s = ngx_array_push(mlcf->mirror); if (s == NULL) { return NGX_CONF_ERROR; } *s = value[1]; return NGX_CONF_OK; } static ngx_int_t ngx_http_mirror_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_PRECONTENT_PHASE].handlers); if (h == NULL) { return NGX_ERROR; } *h = ngx_http_mirror_handler; return NGX_OK; }