Mercurial > hg > nginx
view src/http/modules/ngx_http_headers_filter_module.c @ 3496:fb88801564de
build nginx/Windows against OpenSSL-0.9.8n, since nginx-0.8.35
built against OpenSSL-1.0.0 crashed on Windows XP somewhere
in the NTDLL.DLL on the master process exit
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Wed, 21 Apr 2010 15:09:17 +0000 |
parents | 6cc74c87c656 |
children | dd1570b6f237 |
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/* * Copyright (C) Igor Sysoev */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_http.h> typedef struct ngx_http_header_val_s ngx_http_header_val_t; typedef ngx_int_t (*ngx_http_set_header_pt)(ngx_http_request_t *r, ngx_http_header_val_t *hv, ngx_str_t *value); typedef struct { ngx_str_t name; ngx_uint_t offset; ngx_http_set_header_pt handler; } ngx_http_set_header_t; struct ngx_http_header_val_s { ngx_http_complex_value_t value; ngx_uint_t hash; ngx_str_t key; ngx_http_set_header_pt handler; ngx_uint_t offset; }; #define NGX_HTTP_EXPIRES_OFF 0 #define NGX_HTTP_EXPIRES_EPOCH 1 #define NGX_HTTP_EXPIRES_MAX 2 #define NGX_HTTP_EXPIRES_ACCESS 3 #define NGX_HTTP_EXPIRES_MODIFIED 4 #define NGX_HTTP_EXPIRES_DAILY 5 typedef struct { ngx_uint_t expires; time_t expires_time; ngx_array_t *headers; } ngx_http_headers_conf_t; static ngx_int_t ngx_http_set_expires(ngx_http_request_t *r, ngx_http_headers_conf_t *conf); static ngx_int_t ngx_http_add_cache_control(ngx_http_request_t *r, ngx_http_header_val_t *hv, ngx_str_t *value); static ngx_int_t ngx_http_set_last_modified(ngx_http_request_t *r, ngx_http_header_val_t *hv, ngx_str_t *value); static void *ngx_http_headers_create_conf(ngx_conf_t *cf); static char *ngx_http_headers_merge_conf(ngx_conf_t *cf, void *parent, void *child); static ngx_int_t ngx_http_headers_filter_init(ngx_conf_t *cf); static char *ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static char *ngx_http_headers_add(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static ngx_http_set_header_t ngx_http_set_headers[] = { { ngx_string("Cache-Control"), 0, ngx_http_add_cache_control }, { ngx_string("Last-Modified"), offsetof(ngx_http_headers_out_t, last_modified), ngx_http_set_last_modified }, { ngx_null_string, 0, NULL } }; static ngx_command_t ngx_http_headers_filter_commands[] = { { ngx_string("expires"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF |NGX_CONF_TAKE12, ngx_http_headers_expires, NGX_HTTP_LOC_CONF_OFFSET, 0, NULL}, { ngx_string("add_header"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF |NGX_CONF_TAKE2, ngx_http_headers_add, NGX_HTTP_LOC_CONF_OFFSET, 0, NULL}, ngx_null_command }; static ngx_http_module_t ngx_http_headers_filter_module_ctx = { NULL, /* preconfiguration */ ngx_http_headers_filter_init, /* postconfiguration */ NULL, /* create main configuration */ NULL, /* init main configuration */ NULL, /* create server configuration */ NULL, /* merge server configuration */ ngx_http_headers_create_conf, /* create location configuration */ ngx_http_headers_merge_conf /* merge location configuration */ }; ngx_module_t ngx_http_headers_filter_module = { NGX_MODULE_V1, &ngx_http_headers_filter_module_ctx, /* module context */ ngx_http_headers_filter_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_int_t ngx_http_headers_filter(ngx_http_request_t *r) { ngx_str_t value; ngx_uint_t i; ngx_http_header_val_t *h; ngx_http_headers_conf_t *conf; conf = ngx_http_get_module_loc_conf(r, ngx_http_headers_filter_module); if ((conf->expires == NGX_HTTP_EXPIRES_OFF && conf->headers == NULL) || r != r->main || (r->headers_out.status != NGX_HTTP_OK && r->headers_out.status != NGX_HTTP_NO_CONTENT && r->headers_out.status != NGX_HTTP_MOVED_PERMANENTLY && r->headers_out.status != NGX_HTTP_MOVED_TEMPORARILY && r->headers_out.status != NGX_HTTP_NOT_MODIFIED)) { return ngx_http_next_header_filter(r); } if (conf->expires != NGX_HTTP_EXPIRES_OFF) { if (ngx_http_set_expires(r, conf) != NGX_OK) { return NGX_ERROR; } } if (conf->headers) { h = conf->headers->elts; for (i = 0; i < conf->headers->nelts; i++) { if (ngx_http_complex_value(r, &h[i].value, &value) != NGX_OK) { return NGX_ERROR; } if (h[i].handler(r, &h[i], &value) != NGX_OK) { return NGX_ERROR; } } } return ngx_http_next_header_filter(r); } static ngx_int_t ngx_http_set_expires(ngx_http_request_t *r, ngx_http_headers_conf_t *conf) { size_t len; time_t now, expires_time, max_age; ngx_uint_t i; ngx_table_elt_t *expires, *cc, **ccp; expires = r->headers_out.expires; if (expires == NULL) { expires = ngx_list_push(&r->headers_out.headers); if (expires == NULL) { return NGX_ERROR; } r->headers_out.expires = expires; expires->hash = 1; expires->key.len = sizeof("Expires") - 1; expires->key.data = (u_char *) "Expires"; } len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT"); expires->value.len = len - 1; ccp = r->headers_out.cache_control.elts; if (ccp == NULL) { if (ngx_array_init(&r->headers_out.cache_control, r->pool, 1, sizeof(ngx_table_elt_t *)) != NGX_OK) { return NGX_ERROR; } ccp = ngx_array_push(&r->headers_out.cache_control); if (ccp == NULL) { return NGX_ERROR; } cc = ngx_list_push(&r->headers_out.headers); if (cc == NULL) { return NGX_ERROR; } cc->hash = 1; cc->key.len = sizeof("Cache-Control") - 1; cc->key.data = (u_char *) "Cache-Control"; *ccp = cc; } else { for (i = 1; i < r->headers_out.cache_control.nelts; i++) { ccp[i]->hash = 0; } cc = ccp[0]; } if (conf->expires == NGX_HTTP_EXPIRES_EPOCH) { expires->value.data = (u_char *) "Thu, 01 Jan 1970 00:00:01 GMT"; cc->value.len = sizeof("no-cache") - 1; cc->value.data = (u_char *) "no-cache"; return NGX_OK; } if (conf->expires == NGX_HTTP_EXPIRES_MAX) { expires->value.data = (u_char *) "Thu, 31 Dec 2037 23:55:55 GMT"; /* 10 years */ cc->value.len = sizeof("max-age=315360000") - 1; cc->value.data = (u_char *) "max-age=315360000"; return NGX_OK; } expires->value.data = ngx_pnalloc(r->pool, len); if (expires->value.data == NULL) { return NGX_ERROR; } if (conf->expires_time == 0) { ngx_memcpy(expires->value.data, ngx_cached_http_time.data, ngx_cached_http_time.len + 1); cc->value.len = sizeof("max-age=0") - 1; cc->value.data = (u_char *) "max-age=0"; return NGX_OK; } now = ngx_time(); if (conf->expires == NGX_HTTP_EXPIRES_ACCESS || r->headers_out.last_modified_time == -1) { expires_time = now + conf->expires_time; max_age = conf->expires_time; } else if (conf->expires == NGX_HTTP_EXPIRES_DAILY) { expires_time = ngx_next_time(conf->expires_time); max_age = expires_time - now; } else { expires_time = r->headers_out.last_modified_time + conf->expires_time; max_age = expires_time - now; } ngx_http_time(expires->value.data, expires_time); if (conf->expires_time < 0 || max_age < 0) { cc->value.len = sizeof("no-cache") - 1; cc->value.data = (u_char *) "no-cache"; return NGX_OK; } cc->value.data = ngx_pnalloc(r->pool, sizeof("max-age=") + NGX_TIME_T_LEN + 1); if (cc->value.data == NULL) { return NGX_ERROR; } cc->value.len = ngx_sprintf(cc->value.data, "max-age=%T", max_age) - cc->value.data; return NGX_OK; } static ngx_int_t ngx_http_add_header(ngx_http_request_t *r, ngx_http_header_val_t *hv, ngx_str_t *value) { ngx_table_elt_t *h; if (value->len) { h = ngx_list_push(&r->headers_out.headers); if (h == NULL) { return NGX_ERROR; } h->hash = hv->hash; h->key = hv->key; h->value = *value; } return NGX_OK; } static ngx_int_t ngx_http_add_cache_control(ngx_http_request_t *r, ngx_http_header_val_t *hv, ngx_str_t *value) { ngx_table_elt_t *cc, **ccp; ccp = r->headers_out.cache_control.elts; if (ccp == NULL) { if (ngx_array_init(&r->headers_out.cache_control, r->pool, 1, sizeof(ngx_table_elt_t *)) != NGX_OK) { return NGX_ERROR; } } ccp = ngx_array_push(&r->headers_out.cache_control); if (ccp == NULL) { return NGX_ERROR; } cc = ngx_list_push(&r->headers_out.headers); if (cc == NULL) { return NGX_ERROR; } cc->hash = 1; cc->key.len = sizeof("Cache-Control") - 1; cc->key.data = (u_char *) "Cache-Control"; cc->value = *value; *ccp = cc; return NGX_OK; } static ngx_int_t ngx_http_set_last_modified(ngx_http_request_t *r, ngx_http_header_val_t *hv, ngx_str_t *value) { ngx_table_elt_t *h, **old; if (hv->offset) { old = (ngx_table_elt_t **) ((char *) &r->headers_out + hv->offset); } else { old = NULL; } r->headers_out.last_modified_time = -1; if (old == NULL || *old == NULL) { if (value->len == 0) { return NGX_OK; } h = ngx_list_push(&r->headers_out.headers); if (h == NULL) { return NGX_ERROR; } } else { h = *old; if (value->len == 0) { h->hash = 0; return NGX_OK; } } h->hash = hv->hash; h->key = hv->key; h->value = *value; return NGX_OK; } static void * ngx_http_headers_create_conf(ngx_conf_t *cf) { ngx_http_headers_conf_t *conf; conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_headers_conf_t)); if (conf == NULL) { return NULL; } /* * set by ngx_pcalloc(): * * conf->headers = NULL; * conf->expires_time = 0; */ conf->expires = NGX_CONF_UNSET_UINT; return conf; } static char * ngx_http_headers_merge_conf(ngx_conf_t *cf, void *parent, void *child) { ngx_http_headers_conf_t *prev = parent; ngx_http_headers_conf_t *conf = child; if (conf->expires == NGX_CONF_UNSET_UINT) { conf->expires = prev->expires; conf->expires_time = prev->expires_time; if (conf->expires == NGX_CONF_UNSET_UINT) { conf->expires = NGX_HTTP_EXPIRES_OFF; } } if (conf->headers == NULL) { conf->headers = prev->headers; } return NGX_CONF_OK; } static ngx_int_t ngx_http_headers_filter_init(ngx_conf_t *cf) { ngx_http_next_header_filter = ngx_http_top_header_filter; ngx_http_top_header_filter = ngx_http_headers_filter; return NGX_OK; } static char * ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ngx_http_headers_conf_t *hcf = conf; ngx_uint_t minus, n; ngx_str_t *value; if (hcf->expires != NGX_CONF_UNSET_UINT) { return "is duplicate"; } value = cf->args->elts; if (cf->args->nelts == 2) { if (ngx_strcmp(value[1].data, "epoch") == 0) { hcf->expires = NGX_HTTP_EXPIRES_EPOCH; return NGX_CONF_OK; } if (ngx_strcmp(value[1].data, "max") == 0) { hcf->expires = NGX_HTTP_EXPIRES_MAX; return NGX_CONF_OK; } if (ngx_strcmp(value[1].data, "off") == 0) { hcf->expires = NGX_HTTP_EXPIRES_OFF; return NGX_CONF_OK; } hcf->expires = NGX_HTTP_EXPIRES_ACCESS; n = 1; } else { /* cf->args->nelts == 3 */ if (ngx_strcmp(value[1].data, "modified") != 0) { return "invalid value"; } hcf->expires = NGX_HTTP_EXPIRES_MODIFIED; n = 2; } if (value[n].data[0] == '@') { value[n].data++; value[n].len--; minus = 0; if (hcf->expires == NGX_HTTP_EXPIRES_MODIFIED) { return "daily time can not be used with \"modified\" parameter"; } hcf->expires = NGX_HTTP_EXPIRES_DAILY; } else if (value[n].data[0] == '+') { value[n].data++; value[n].len--; minus = 0; } else if (value[n].data[0] == '-') { value[n].data++; value[n].len--; minus = 1; } else { minus = 0; } hcf->expires_time = ngx_parse_time(&value[n], 1); if (hcf->expires_time == NGX_ERROR) { return "invalid value"; } if (hcf->expires == NGX_HTTP_EXPIRES_DAILY && hcf->expires_time > 24 * 60 * 60) { return "daily time value must be less than 24 hours"; } if (hcf->expires_time == NGX_PARSE_LARGE_TIME) { return "value must be less than 68 years"; } if (minus) { hcf->expires_time = - hcf->expires_time; } return NGX_CONF_OK; } static char * ngx_http_headers_add(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ngx_http_headers_conf_t *hcf = conf; ngx_str_t *value; ngx_uint_t i; ngx_http_header_val_t *hv; ngx_http_set_header_t *set; ngx_http_compile_complex_value_t ccv; value = cf->args->elts; if (hcf->headers == NULL) { hcf->headers = ngx_array_create(cf->pool, 1, sizeof(ngx_http_header_val_t)); if (hcf->headers == NULL) { return NGX_CONF_ERROR; } } hv = ngx_array_push(hcf->headers); if (hv == NULL) { return NGX_CONF_ERROR; } hv->hash = 1; hv->key = value[1]; hv->handler = ngx_http_add_header; hv->offset = 0; set = ngx_http_set_headers; for (i = 0; set[i].name.len; i++) { if (ngx_strcasecmp(value[1].data, set[i].name.data) != 0) { continue; } hv->offset = set[i].offset; hv->handler = set[i].handler; break; } if (value[2].len == 0) { ngx_memzero(&hv->value, sizeof(ngx_http_complex_value_t)); return NGX_CONF_OK; } ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t)); ccv.cf = cf; ccv.value = &value[2]; ccv.complex_value = &hv->value; if (ngx_http_compile_complex_value(&ccv) != NGX_OK) { return NGX_CONF_ERROR; } return NGX_CONF_OK; }