Mercurial > hg > nginx-quic
view src/http/modules/ngx_http_addition_filter_module.c @ 8509:5b0c229ba5fe quic
QUIC: fixed padding calculation.
Sometimes, QUIC packets need to be of certain (or minimal) size. This is
achieved by adding PADDING frames. It is possible, that adding padding will
affect header size, thus forcing us to recalculate padding size once more.
author | Vladimir Homutov <vl@nginx.com> |
---|---|
date | Mon, 05 Jul 2021 13:17:10 +0300 |
parents | f583559aadc7 |
children |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_http.h> typedef struct { ngx_str_t before_body; ngx_str_t after_body; ngx_hash_t types; ngx_array_t *types_keys; } ngx_http_addition_conf_t; typedef struct { ngx_uint_t before_body_sent; } ngx_http_addition_ctx_t; static void *ngx_http_addition_create_conf(ngx_conf_t *cf); static char *ngx_http_addition_merge_conf(ngx_conf_t *cf, void *parent, void *child); static ngx_int_t ngx_http_addition_filter_init(ngx_conf_t *cf); static ngx_command_t ngx_http_addition_commands[] = { { ngx_string("add_before_body"), 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_http_addition_conf_t, before_body), NULL }, { ngx_string("add_after_body"), 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_http_addition_conf_t, after_body), NULL }, { ngx_string("addition_types"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE, ngx_http_types_slot, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_addition_conf_t, types_keys), &ngx_http_html_default_types[0] }, ngx_null_command }; static ngx_http_module_t ngx_http_addition_filter_module_ctx = { NULL, /* preconfiguration */ ngx_http_addition_filter_init, /* postconfiguration */ NULL, /* create main configuration */ NULL, /* init main configuration */ NULL, /* create server configuration */ NULL, /* merge server configuration */ ngx_http_addition_create_conf, /* create location configuration */ ngx_http_addition_merge_conf /* merge location configuration */ }; ngx_module_t ngx_http_addition_filter_module = { NGX_MODULE_V1, &ngx_http_addition_filter_module_ctx, /* module context */ ngx_http_addition_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_http_output_header_filter_pt ngx_http_next_header_filter; static ngx_http_output_body_filter_pt ngx_http_next_body_filter; static ngx_int_t ngx_http_addition_header_filter(ngx_http_request_t *r) { ngx_http_addition_ctx_t *ctx; ngx_http_addition_conf_t *conf; if (r->headers_out.status != NGX_HTTP_OK || r != r->main) { return ngx_http_next_header_filter(r); } conf = ngx_http_get_module_loc_conf(r, ngx_http_addition_filter_module); if (conf->before_body.len == 0 && conf->after_body.len == 0) { return ngx_http_next_header_filter(r); } if (ngx_http_test_content_type(r, &conf->types) == NULL) { return ngx_http_next_header_filter(r); } ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_addition_ctx_t)); if (ctx == NULL) { return NGX_ERROR; } ngx_http_set_ctx(r, ctx, ngx_http_addition_filter_module); ngx_http_clear_content_length(r); ngx_http_clear_accept_ranges(r); ngx_http_weak_etag(r); r->preserve_body = 1; return ngx_http_next_header_filter(r); } static ngx_int_t ngx_http_addition_body_filter(ngx_http_request_t *r, ngx_chain_t *in) { ngx_int_t rc; ngx_uint_t last; ngx_chain_t *cl; ngx_http_request_t *sr; ngx_http_addition_ctx_t *ctx; ngx_http_addition_conf_t *conf; if (in == NULL || r->header_only) { return ngx_http_next_body_filter(r, in); } ctx = ngx_http_get_module_ctx(r, ngx_http_addition_filter_module); if (ctx == NULL) { return ngx_http_next_body_filter(r, in); } conf = ngx_http_get_module_loc_conf(r, ngx_http_addition_filter_module); if (!ctx->before_body_sent) { ctx->before_body_sent = 1; if (conf->before_body.len) { if (ngx_http_subrequest(r, &conf->before_body, NULL, &sr, NULL, 0) != NGX_OK) { return NGX_ERROR; } } } if (conf->after_body.len == 0) { ngx_http_set_ctx(r, NULL, ngx_http_addition_filter_module); return ngx_http_next_body_filter(r, in); } last = 0; for (cl = in; cl; cl = cl->next) { if (cl->buf->last_buf) { cl->buf->last_buf = 0; cl->buf->last_in_chain = 1; cl->buf->sync = 1; last = 1; } } rc = ngx_http_next_body_filter(r, in); if (rc == NGX_ERROR || !last || conf->after_body.len == 0) { return rc; } if (ngx_http_subrequest(r, &conf->after_body, NULL, &sr, NULL, 0) != NGX_OK) { return NGX_ERROR; } ngx_http_set_ctx(r, NULL, ngx_http_addition_filter_module); return ngx_http_send_special(r, NGX_HTTP_LAST); } static ngx_int_t ngx_http_addition_filter_init(ngx_conf_t *cf) { ngx_http_next_header_filter = ngx_http_top_header_filter; ngx_http_top_header_filter = ngx_http_addition_header_filter; ngx_http_next_body_filter = ngx_http_top_body_filter; ngx_http_top_body_filter = ngx_http_addition_body_filter; return NGX_OK; } static void * ngx_http_addition_create_conf(ngx_conf_t *cf) { ngx_http_addition_conf_t *conf; conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_addition_conf_t)); if (conf == NULL) { return NULL; } /* * set by ngx_pcalloc(): * * conf->before_body = { 0, NULL }; * conf->after_body = { 0, NULL }; * conf->types = { NULL }; * conf->types_keys = NULL; */ return conf; } static char * ngx_http_addition_merge_conf(ngx_conf_t *cf, void *parent, void *child) { ngx_http_addition_conf_t *prev = parent; ngx_http_addition_conf_t *conf = child; ngx_conf_merge_str_value(conf->before_body, prev->before_body, ""); ngx_conf_merge_str_value(conf->after_body, prev->after_body, ""); if (ngx_http_merge_types(cf, &conf->types_keys, &conf->types, &prev->types_keys, &prev->types, ngx_http_html_default_types) != NGX_OK) { return NGX_CONF_ERROR; } return NGX_CONF_OK; }