| |
| /* |
| * Copyright (C) Igor Sysoev |
| */ |
| |
| |
| #include <ngx_config.h> |
| #include <ngx_core.h> |
| #include <ngx_event.h> |
| #include <ngx_http.h> |
| |
| |
| #define NGX_HTTP_VARS_HASH_PRIME 29 |
| |
| #define ngx_http_vars_hash_key(key, vn) \ |
| { \ |
| ngx_uint_t n; \ |
| for (key = 0, n = 0; n < (vn)->len; n++) { \ |
| key += (vn)->data[n]; \ |
| } \ |
| key %= NGX_HTTP_VARS_HASH_PRIME; \ |
| } |
| |
| |
| static ngx_http_variable_value_t * |
| ngx_http_variable_header(ngx_http_request_t *r, uintptr_t data); |
| static ngx_http_variable_value_t * |
| ngx_http_variable_unknown_header(ngx_http_request_t *r, ngx_str_t *var); |
| static ngx_http_variable_value_t * |
| ngx_http_variable_remote_addr(ngx_http_request_t *r, uintptr_t data); |
| static ngx_http_variable_value_t * |
| ngx_http_variable_uri(ngx_http_request_t *r, uintptr_t data); |
| static ngx_http_variable_value_t * |
| ngx_http_variable_query_string(ngx_http_request_t *r, uintptr_t data); |
| |
| |
| static ngx_array_t *ngx_http_core_variables_hash; |
| |
| |
| static ngx_http_core_variable_t ngx_http_core_variables[] = { |
| |
| { ngx_string("HTTP_HOST"), ngx_http_variable_header, |
| offsetof(ngx_http_headers_in_t, host) }, |
| |
| { ngx_string("HTTP_USER_AGENT"), ngx_http_variable_header, |
| offsetof(ngx_http_headers_in_t, user_agent) }, |
| |
| { ngx_string("HTTP_REFERER"), ngx_http_variable_header, |
| offsetof(ngx_http_headers_in_t, referer) }, |
| |
| #if (NGX_HTTP_GZIP) |
| { ngx_string("HTTP_VIA"), ngx_http_variable_header, |
| offsetof(ngx_http_headers_in_t, via) }, |
| #endif |
| |
| #if (NGX_HTTP_PROXY) |
| { ngx_string("HTTP_X_FORWARDED_FOR"), ngx_http_variable_header, |
| offsetof(ngx_http_headers_in_t, x_forwarded_for) }, |
| #endif |
| |
| { ngx_string("REMOTE_ADDR"), ngx_http_variable_remote_addr, 0 }, |
| |
| { ngx_string("DOCUMENT_URI"), ngx_http_variable_uri, 0 }, |
| |
| { ngx_string("QUERY_STRING"), ngx_http_variable_query_string, 0 }, |
| |
| { ngx_null_string, NULL, 0 } |
| }; |
| |
| |
| ngx_http_variable_t * |
| ngx_http_add_variable(ngx_conf_t *cf) |
| { |
| ngx_http_variable_t *var; |
| ngx_http_core_main_conf_t *cmcf; |
| |
| cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); |
| |
| if (cmcf->variables.elts == NULL) { |
| if (ngx_array_init(&cmcf->variables, cf->pool, 4, |
| sizeof(ngx_http_variable_t)) == NGX_ERROR) |
| { |
| return NULL; |
| } |
| } |
| |
| if (!(var = ngx_array_push(&cmcf->variables))) { |
| return NULL; |
| } |
| |
| var->index = cmcf->variables.nelts - 1; |
| |
| return var; |
| } |
| |
| |
| ngx_http_variable_value_t * |
| ngx_http_get_indexed_variable(ngx_http_request_t *r, ngx_uint_t index) |
| { |
| ngx_http_variable_t *var; |
| ngx_http_core_main_conf_t *cmcf; |
| |
| /* TODO: cached variables */ |
| |
| cmcf = ngx_http_get_module_main_conf(r, ngx_http_core_module); |
| |
| if (cmcf->variables.elts == NULL || cmcf->variables.nelts <= index) { |
| ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0, |
| "unknown variable index: %d", index); |
| return NULL; |
| } |
| |
| var = cmcf->variables.elts; |
| |
| return var[index].handler(r, var[index].data); |
| } |
| |
| |
| ngx_int_t |
| ngx_http_get_variable_index(ngx_http_core_main_conf_t *cmcf, ngx_str_t *name) |
| { |
| ngx_uint_t i; |
| ngx_http_variable_t *var; |
| |
| var = cmcf->variables.elts; |
| for (i = 0; i < cmcf->variables.nelts; i++) { |
| if (var[i].name.len != name->len) { |
| continue; |
| } |
| |
| if (ngx_strncasecmp(var[i].name.data, name->data, name->len) == 0) { |
| return var[i].index; |
| } |
| } |
| |
| return -1; |
| } |
| |
| |
| ngx_http_variable_value_t * |
| ngx_http_get_variable(ngx_http_request_t *r, ngx_str_t *name) |
| { |
| ngx_int_t index; |
| ngx_uint_t i, key; |
| ngx_http_core_variable_t *var; |
| ngx_http_core_main_conf_t *cmcf; |
| |
| cmcf = ngx_http_get_module_main_conf(r, ngx_http_core_module); |
| |
| index = ngx_http_get_variable_index(cmcf, name); |
| |
| if (index != -1) { |
| return ngx_http_get_indexed_variable(r, index); |
| } |
| |
| ngx_http_vars_hash_key(key, name); |
| |
| var = ngx_http_core_variables_hash[key].elts; |
| for (i = 0; i < ngx_http_core_variables_hash[key].nelts; i++) { |
| |
| if (var[i].name.len != name->len |
| || ngx_strncasecmp(var[i].name.data, name->data, name->len) != 0) |
| { |
| continue; |
| } |
| |
| return var[i].handler(r, var[i].data); |
| } |
| |
| if (ngx_strncasecmp(name->data, "HTTP_", 5) != 0) { |
| ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
| "unknown \"%V\" variable", name); |
| return NGX_HTTP_VARIABLE_NOT_FOUND; |
| } |
| |
| return ngx_http_variable_unknown_header(r, name); |
| } |
| |
| |
| static ngx_http_variable_value_t * |
| ngx_http_variable_header(ngx_http_request_t *r, uintptr_t data) |
| { |
| ngx_table_elt_t *h; |
| ngx_http_variable_value_t *v; |
| |
| h = *(ngx_table_elt_t **) ((char *) &r->headers_in + data); |
| |
| if (h == NULL) { |
| return NGX_HTTP_VARIABLE_NOT_FOUND; |
| } |
| |
| if (!(v = ngx_palloc(r->pool, sizeof(ngx_http_variable_value_t)))) { |
| return NULL; |
| } |
| |
| v->value = 0; |
| v->text = h->value; |
| |
| return v; |
| } |
| |
| |
| static ngx_http_variable_value_t * |
| ngx_http_variable_unknown_header(ngx_http_request_t *r, ngx_str_t *var) |
| { |
| u_char ch; |
| ngx_uint_t i, n; |
| ngx_list_part_t *part; |
| ngx_table_elt_t *header; |
| ngx_http_variable_value_t *v; |
| |
| part = &r->headers_in.headers.part; |
| header = part->elts; |
| |
| for (i = 0; /* void */ ; i++) { |
| |
| if (i >= part->nelts) { |
| if (part->next == NULL) { |
| break; |
| } |
| |
| part = part->next; |
| header = part->elts; |
| i = 0; |
| } |
| |
| for (n = 0; n + 5 < var->len && n < header[i].key.len; n++) |
| { |
| ch = header[i].key.data[n]; |
| |
| if (ch >= 'a' && ch <= 'z') { |
| ch &= ~0x20; |
| |
| } else if (ch == '-') { |
| ch = '_'; |
| } |
| |
| if (var->data[n + 5] != ch) { |
| break; |
| } |
| } |
| |
| if (n + 5 == var->len) { |
| if (!(v = ngx_palloc(r->pool, sizeof(ngx_http_variable_value_t)))) { |
| return NULL; |
| } |
| |
| v->value = 0; |
| v->text = header[i].value; |
| return v; |
| } |
| } |
| |
| return NGX_HTTP_VARIABLE_NOT_FOUND; |
| } |
| |
| |
| static ngx_http_variable_value_t * |
| ngx_http_variable_remote_addr(ngx_http_request_t *r, uintptr_t data) |
| { |
| ngx_http_variable_value_t *v; |
| |
| if (!(v = ngx_palloc(r->pool, sizeof(ngx_http_variable_value_t)))) { |
| return NULL; |
| } |
| |
| v->value = 0; |
| v->text = r->connection->addr_text; |
| |
| return v; |
| } |
| |
| |
| static ngx_http_variable_value_t * |
| ngx_http_variable_uri(ngx_http_request_t *r, uintptr_t data) |
| { |
| ngx_http_variable_value_t *v; |
| |
| if (!(v = ngx_palloc(r->pool, sizeof(ngx_http_variable_value_t)))) { |
| return NULL; |
| } |
| |
| v->value = 0; |
| v->text = r->uri; |
| |
| return v; |
| } |
| |
| |
| static ngx_http_variable_value_t * |
| ngx_http_variable_query_string(ngx_http_request_t *r, uintptr_t data) |
| { |
| ngx_http_variable_value_t *v; |
| |
| if (!(v = ngx_palloc(r->pool, sizeof(ngx_http_variable_value_t)))) { |
| return NULL; |
| } |
| |
| v->value = 0; |
| v->text = r->args; |
| |
| return v; |
| } |
| |
| |
| ngx_int_t |
| ngx_http_core_variables_init(ngx_cycle_t *cycle) |
| { |
| ngx_uint_t i, key; |
| ngx_http_core_variable_t *var, *v; |
| |
| ngx_http_core_variables_hash = ngx_palloc(cycle->pool, |
| NGX_HTTP_VARS_HASH_PRIME |
| * sizeof(ngx_array_t)); |
| if (ngx_http_core_variables_hash == NULL) { |
| return NGX_ERROR; |
| } |
| |
| for (i = 0; i < NGX_HTTP_VARS_HASH_PRIME; i++) { |
| if (ngx_array_init(&ngx_http_core_variables_hash[i], cycle->pool, 4, |
| sizeof(ngx_http_core_variable_t)) == NGX_ERROR) |
| { |
| return NGX_ERROR; |
| } |
| } |
| |
| for (var = ngx_http_core_variables; var->name.len; var++) { |
| ngx_http_vars_hash_key(key, &var->name); |
| |
| if (!(v = ngx_array_push(&ngx_http_core_variables_hash[key]))) { |
| return NGX_ERROR; |
| } |
| |
| *v = *var; |
| } |
| |
| return NGX_OK; |
| } |