| /* ==================================================================== |
| * The Apache Software License, Version 1.1 |
| * |
| * Copyright (c) 2000-2001 The Apache Software Foundation. All rights |
| * reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. The end-user documentation included with the redistribution, |
| * if any, must include the following acknowledgment: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowledgment may appear in the software itself, |
| * if and wherever such third-party acknowledgments normally appear. |
| * |
| * 4. The names "Apache" and "Apache Software Foundation" must |
| * not be used to endorse or promote products derived from this |
| * software without prior written permission. For written |
| * permission, please contact apache@apache.org. |
| * |
| * 5. Products derived from this software may not be called "Apache", |
| * nor may "Apache" appear in their name, without prior written |
| * permission of the Apache Software Foundation. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| * |
| * Portions of this software are based upon public domain software |
| * originally written at the National Center for Supercomputing Applications, |
| * University of Illinois, Urbana-Champaign. |
| */ |
| |
| /* |
| * http_protocol.c --- routines which directly communicate with the client. |
| * |
| * Code originally by Rob McCool; much redone by Robert S. Thau |
| * and the Apache Software Foundation. |
| */ |
| |
| #include "apr.h" |
| #include "apr_strings.h" |
| #include "apr_buckets.h" |
| #include "apr_lib.h" |
| #include "apr_signal.h" |
| |
| #define APR_WANT_STDIO /* for sscanf */ |
| #define APR_WANT_STRFUNC |
| #define APR_WANT_MEMFUNC |
| #include "apr_want.h" |
| |
| #define CORE_PRIVATE |
| #include "util_filter.h" |
| #include "ap_config.h" |
| #include "httpd.h" |
| #include "http_config.h" |
| #include "http_core.h" |
| #include "http_protocol.h" |
| #include "http_main.h" |
| #include "http_request.h" |
| #include "http_vhost.h" |
| #include "http_log.h" /* For errors detected in basic auth common |
| * support code... */ |
| #include "util_date.h" /* For parseHTTPdate and BAD_DATE */ |
| #include "util_charset.h" |
| #include "util_ebcdic.h" |
| |
| #include "mod_core.h" |
| |
| #if APR_HAVE_STDARG_H |
| #include <stdarg.h> |
| #endif |
| #if APR_HAVE_UNISTD_H |
| #include <unistd.h> |
| #endif |
| |
| |
| AP_DECLARE(int) ap_set_keepalive(request_rec *r) |
| { |
| int ka_sent = 0; |
| int wimpy = ap_find_token(r->pool, |
| apr_table_get(r->headers_out, "Connection"), "close"); |
| const char *conn = apr_table_get(r->headers_in, "Connection"); |
| |
| /* The following convoluted conditional determines whether or not |
| * the current connection should remain persistent after this response |
| * (a.k.a. HTTP Keep-Alive) and whether or not the output message |
| * body should use the HTTP/1.1 chunked transfer-coding. In English, |
| * |
| * IF we have not marked this connection as errored; |
| * and the response body has a defined length due to the status code |
| * being 304 or 204, the request method being HEAD, already |
| * having defined Content-Length or Transfer-Encoding: chunked, or |
| * the request version being HTTP/1.1 and thus capable of being set |
| * as chunked [we know the (r->chunked = 1) side-effect is ugly]; |
| * and the server configuration enables keep-alive; |
| * and the server configuration has a reasonable inter-request timeout; |
| * and there is no maximum # requests or the max hasn't been reached; |
| * and the response status does not require a close; |
| * and the response generator has not already indicated close; |
| * and the client did not request non-persistence (Connection: close); |
| * and we haven't been configured to ignore the buggy twit |
| * or they're a buggy twit coming through a HTTP/1.1 proxy |
| * and the client is requesting an HTTP/1.0-style keep-alive |
| * or the client claims to be HTTP/1.1 compliant (perhaps a proxy); |
| * THEN we can be persistent, which requires more headers be output. |
| * |
| * Note that the condition evaluation order is extremely important. |
| */ |
| if ((r->connection->keepalive != -1) |
| && ((r->status == HTTP_NOT_MODIFIED) |
| || (r->status == HTTP_NO_CONTENT) |
| || r->header_only |
| || apr_table_get(r->headers_out, "Content-Length") |
| || ap_find_last_token(r->pool, |
| apr_table_get(r->headers_out, |
| "Transfer-Encoding"), |
| "chunked") |
| || ((r->proto_num >= HTTP_VERSION(1,1)) |
| && (r->chunked = 1))) /* THIS CODE IS CORRECT, see comment above. */ |
| && r->server->keep_alive |
| && (r->server->keep_alive_timeout > 0) |
| && ((r->server->keep_alive_max == 0) |
| || (r->server->keep_alive_max > r->connection->keepalives)) |
| && !ap_status_drops_connection(r->status) |
| && !wimpy |
| && !ap_find_token(r->pool, conn, "close") |
| && (!apr_table_get(r->subprocess_env, "nokeepalive") |
| || apr_table_get(r->headers_in, "Via")) |
| && ((ka_sent = ap_find_token(r->pool, conn, "keep-alive")) |
| || (r->proto_num >= HTTP_VERSION(1,1)))) { |
| int left = r->server->keep_alive_max - r->connection->keepalives; |
| |
| r->connection->keepalive = 1; |
| r->connection->keepalives++; |
| |
| /* If they sent a Keep-Alive token, send one back */ |
| if (ka_sent) { |
| if (r->server->keep_alive_max) |
| apr_table_setn(r->headers_out, "Keep-Alive", |
| apr_psprintf(r->pool, "timeout=%d, max=%d", |
| r->server->keep_alive_timeout, left)); |
| else |
| apr_table_setn(r->headers_out, "Keep-Alive", |
| apr_psprintf(r->pool, "timeout=%d", |
| r->server->keep_alive_timeout)); |
| apr_table_mergen(r->headers_out, "Connection", "Keep-Alive"); |
| } |
| |
| return 1; |
| } |
| |
| /* Otherwise, we need to indicate that we will be closing this |
| * connection immediately after the current response. |
| * |
| * We only really need to send "close" to HTTP/1.1 clients, but we |
| * always send it anyway, because a broken proxy may identify itself |
| * as HTTP/1.0, but pass our request along with our HTTP/1.1 tag |
| * to a HTTP/1.1 client. Better safe than sorry. |
| */ |
| if (!wimpy) |
| apr_table_mergen(r->headers_out, "Connection", "close"); |
| |
| r->connection->keepalive = 0; |
| |
| return 0; |
| } |
| |
| AP_DECLARE(int) ap_meets_conditions(request_rec *r) |
| { |
| const char *etag = apr_table_get(r->headers_out, "ETag"); |
| const char *if_match, *if_modified_since, *if_unmodified, *if_nonematch; |
| apr_time_t mtime; |
| |
| /* Check for conditional requests --- note that we only want to do |
| * this if we are successful so far and we are not processing a |
| * subrequest or an ErrorDocument. |
| * |
| * The order of the checks is important, since ETag checks are supposed |
| * to be more accurate than checks relative to the modification time. |
| * However, not all documents are guaranteed to *have* ETags, and some |
| * might have Last-Modified values w/o ETags, so this gets a little |
| * complicated. |
| */ |
| |
| if (!ap_is_HTTP_SUCCESS(r->status) || r->no_local_copy) { |
| return OK; |
| } |
| |
| /* XXX: we should define a "time unset" constant */ |
| mtime = (r->mtime != 0) ? r->mtime : apr_time_now(); |
| |
| /* If an If-Match request-header field was given |
| * AND the field value is not "*" (meaning match anything) |
| * AND if our strong ETag does not match any entity tag in that field, |
| * respond with a status of 412 (Precondition Failed). |
| */ |
| if ((if_match = apr_table_get(r->headers_in, "If-Match")) != NULL) { |
| if (if_match[0] != '*' |
| && (etag == NULL || etag[0] == 'W' |
| || !ap_find_list_item(r->pool, if_match, etag))) { |
| return HTTP_PRECONDITION_FAILED; |
| } |
| } |
| else { |
| /* Else if a valid If-Unmodified-Since request-header field was given |
| * AND the requested resource has been modified since the time |
| * specified in this field, then the server MUST |
| * respond with a status of 412 (Precondition Failed). |
| */ |
| if_unmodified = apr_table_get(r->headers_in, "If-Unmodified-Since"); |
| if (if_unmodified != NULL) { |
| apr_time_t ius = ap_parseHTTPdate(if_unmodified); |
| |
| if ((ius != BAD_DATE) && (mtime > ius)) { |
| return HTTP_PRECONDITION_FAILED; |
| } |
| } |
| } |
| |
| /* If an If-None-Match request-header field was given |
| * AND the field value is "*" (meaning match anything) |
| * OR our ETag matches any of the entity tags in that field, fail. |
| * |
| * If the request method was GET or HEAD, failure means the server |
| * SHOULD respond with a 304 (Not Modified) response. |
| * For all other request methods, failure means the server MUST |
| * respond with a status of 412 (Precondition Failed). |
| * |
| * GET or HEAD allow weak etag comparison, all other methods require |
| * strong comparison. We can only use weak if it's not a range request. |
| */ |
| if_nonematch = apr_table_get(r->headers_in, "If-None-Match"); |
| if (if_nonematch != NULL) { |
| if (r->method_number == M_GET) { |
| if (if_nonematch[0] == '*') { |
| return HTTP_NOT_MODIFIED; |
| } |
| if (etag != NULL) { |
| if (apr_table_get(r->headers_in, "Range")) { |
| if (etag[0] != 'W' |
| && ap_find_list_item(r->pool, if_nonematch, etag)) { |
| return HTTP_NOT_MODIFIED; |
| } |
| } |
| else if (ap_strstr_c(if_nonematch, etag)) { |
| return HTTP_NOT_MODIFIED; |
| } |
| } |
| } |
| else if (if_nonematch[0] == '*' |
| || (etag != NULL |
| && ap_find_list_item(r->pool, if_nonematch, etag))) { |
| return HTTP_PRECONDITION_FAILED; |
| } |
| } |
| /* Else if a valid If-Modified-Since request-header field was given |
| * AND it is a GET or HEAD request |
| * AND the requested resource has not been modified since the time |
| * specified in this field, then the server MUST |
| * respond with a status of 304 (Not Modified). |
| * A date later than the server's current request time is invalid. |
| */ |
| else if ((r->method_number == M_GET) |
| && ((if_modified_since = |
| apr_table_get(r->headers_in, |
| "If-Modified-Since")) != NULL)) { |
| apr_time_t ims = ap_parseHTTPdate(if_modified_since); |
| |
| if ((ims >= mtime) && (ims <= r->request_time)) { |
| return HTTP_NOT_MODIFIED; |
| } |
| } |
| return OK; |
| } |
| |
| /* Get the method number associated with the given string, assumed to |
| * contain an HTTP method. Returns M_INVALID if not recognized. |
| * |
| * This is the first step toward placing method names in a configurable |
| * list. Hopefully it (and other routines) can eventually be moved to |
| * something like a mod_http_methods.c, complete with config stuff. |
| */ |
| AP_DECLARE(int) ap_method_number_of(const char *method) |
| { |
| switch (*method) { |
| case 'H': |
| if (strcmp(method, "HEAD") == 0) |
| return M_GET; /* see header_only in request_rec */ |
| break; |
| case 'G': |
| if (strcmp(method, "GET") == 0) |
| return M_GET; |
| break; |
| case 'P': |
| if (strcmp(method, "POST") == 0) |
| return M_POST; |
| if (strcmp(method, "PUT") == 0) |
| return M_PUT; |
| if (strcmp(method, "PATCH") == 0) |
| return M_PATCH; |
| if (strcmp(method, "PROPFIND") == 0) |
| return M_PROPFIND; |
| if (strcmp(method, "PROPPATCH") == 0) |
| return M_PROPPATCH; |
| break; |
| case 'D': |
| if (strcmp(method, "DELETE") == 0) |
| return M_DELETE; |
| break; |
| case 'C': |
| if (strcmp(method, "CONNECT") == 0) |
| return M_CONNECT; |
| if (strcmp(method, "COPY") == 0) |
| return M_COPY; |
| break; |
| case 'M': |
| if (strcmp(method, "MKCOL") == 0) |
| return M_MKCOL; |
| if (strcmp(method, "MOVE") == 0) |
| return M_MOVE; |
| break; |
| case 'O': |
| if (strcmp(method, "OPTIONS") == 0) |
| return M_OPTIONS; |
| break; |
| case 'T': |
| if (strcmp(method, "TRACE") == 0) |
| return M_TRACE; |
| break; |
| case 'L': |
| if (strcmp(method, "LOCK") == 0) |
| return M_LOCK; |
| break; |
| case 'U': |
| if (strcmp(method, "UNLOCK") == 0) |
| return M_UNLOCK; |
| break; |
| } |
| return M_INVALID; |
| } |
| |
| /* |
| * Turn a known method number into a name. Doesn't work for |
| * extension methods, obviously. |
| */ |
| AP_DECLARE(const char *) ap_method_name_of(int methnum) |
| { |
| static const char *AP_HTTP_METHODS[METHODS] = { NULL }; |
| |
| /* |
| * This is ugly, but the previous incantation made Windows C |
| * varf. I'm not even sure it was ANSI C. However, ugly as it |
| * is, this works, and we only have to do it once. |
| */ |
| if (AP_HTTP_METHODS[0] == NULL) { |
| AP_HTTP_METHODS[M_GET] = "GET"; |
| AP_HTTP_METHODS[M_PUT] = "PUT"; |
| AP_HTTP_METHODS[M_POST] = "POST"; |
| AP_HTTP_METHODS[M_DELETE] = "DELETE"; |
| AP_HTTP_METHODS[M_CONNECT] = "CONNECT"; |
| AP_HTTP_METHODS[M_OPTIONS] = "OPTIONS"; |
| AP_HTTP_METHODS[M_TRACE] = "TRACE"; |
| AP_HTTP_METHODS[M_PATCH] = "PATCH"; |
| AP_HTTP_METHODS[M_PROPFIND] = "PROPFIND"; |
| AP_HTTP_METHODS[M_PROPPATCH] = "PROPPATCH"; |
| AP_HTTP_METHODS[M_MKCOL] = "MKCOL"; |
| AP_HTTP_METHODS[M_COPY] = "COPY"; |
| AP_HTTP_METHODS[M_MOVE] = "MOVE"; |
| AP_HTTP_METHODS[M_LOCK] = "LOCK"; |
| AP_HTTP_METHODS[M_UNLOCK] = "UNLOCK"; |
| AP_HTTP_METHODS[M_INVALID] = NULL; |
| /* |
| * Since we're using symbolic names, make sure we only do |
| * this once by forcing a value into the first slot IFF it's |
| * still NULL. |
| */ |
| if (AP_HTTP_METHODS[0] == NULL) { |
| AP_HTTP_METHODS[0] = "INVALID"; |
| } |
| } |
| |
| if ((methnum == M_INVALID) || (methnum >= METHODS)) { |
| return NULL; |
| } |
| return AP_HTTP_METHODS[methnum]; |
| } |
| |
| struct dechunk_ctx { |
| apr_size_t chunk_size; |
| apr_size_t bytes_delivered; |
| enum {WANT_HDR /* must have value zero */, WANT_BODY, WANT_TRL} state; |
| }; |
| |
| static long get_chunk_size(char *); |
| |
| apr_status_t ap_dechunk_filter(ap_filter_t *f, apr_bucket_brigade *bb, |
| ap_input_mode_t mode, apr_size_t *readbytes) |
| { |
| apr_status_t rv; |
| struct dechunk_ctx *ctx = f->ctx; |
| apr_bucket *b; |
| const char *buf; |
| apr_size_t len; |
| |
| if (!ctx) { |
| f->ctx = ctx = apr_pcalloc(f->r->pool, sizeof(struct dechunk_ctx)); |
| } |
| |
| do { |
| if (ctx->chunk_size == ctx->bytes_delivered) { |
| /* Time to read another chunk header or trailer... ap_http_filter() is |
| * the next filter in line and it knows how to return a brigade with |
| * one line. |
| */ |
| char line[30]; |
| |
| if ((rv = ap_getline(line, sizeof(line), f->r, 0)) < 0) { |
| return rv; |
| } |
| switch(ctx->state) { |
| case WANT_HDR: |
| ctx->chunk_size = get_chunk_size(line); |
| ctx->bytes_delivered = 0; |
| if (ctx->chunk_size == 0) { |
| ctx->state = WANT_TRL; |
| } |
| else { |
| ctx->state = WANT_BODY; |
| } |
| break; |
| case WANT_TRL: |
| /* XXX sanity check end chunk here */ |
| if (strlen(line)) { |
| /* bad trailer */ |
| } |
| if (ctx->chunk_size == 0) { /* we just finished the last chunk? */ |
| /* append eos bucket and get out */ |
| b = apr_bucket_eos_create(); |
| APR_BRIGADE_INSERT_TAIL(bb, b); |
| return APR_SUCCESS; |
| } |
| ctx->state = WANT_HDR; |
| break; |
| default: |
| ap_assert(ctx->state == WANT_HDR || ctx->state == WANT_TRL); |
| } |
| } |
| } while (ctx->state != WANT_BODY); |
| |
| if (ctx->state == WANT_BODY) { |
| /* Tell ap_http_filter() how many bytes to deliver. */ |
| apr_size_t readbytes = ctx->chunk_size - ctx->bytes_delivered; |
| if ((rv = ap_get_brigade(f->next, bb, mode, &readbytes)) != APR_SUCCESS) { |
| return rv; |
| } |
| /* Walk through the body, accounting for bytes, and removing an eos bucket if |
| * ap_http_filter() delivered the entire chunk. |
| */ |
| b = APR_BRIGADE_FIRST(bb); |
| while (b != APR_BRIGADE_SENTINEL(bb) && !APR_BUCKET_IS_EOS(b)) { |
| apr_bucket_read(b, &buf, &len, mode); |
| AP_DEBUG_ASSERT(len <= ctx->chunk_size - ctx->bytes_delivered); |
| ctx->bytes_delivered += len; |
| b = APR_BUCKET_NEXT(b); |
| } |
| if (ctx->bytes_delivered == ctx->chunk_size) { |
| AP_DEBUG_ASSERT(APR_BUCKET_IS_EOS(b)); |
| apr_bucket_delete(b); |
| ctx->state = WANT_TRL; |
| } |
| } |
| |
| return APR_SUCCESS; |
| } |
| |
| typedef struct http_filter_ctx { |
| apr_bucket_brigade *b; |
| } http_ctx_t; |
| |
| apr_status_t ap_http_filter(ap_filter_t *f, apr_bucket_brigade *b, ap_input_mode_t mode, apr_size_t *readbytes) |
| { |
| apr_bucket *e; |
| char *buff; |
| apr_size_t len; |
| char *pos; |
| http_ctx_t *ctx = f->ctx; |
| apr_status_t rv; |
| |
| if (!ctx) { |
| f->ctx = ctx = apr_pcalloc(f->c->pool, sizeof(*ctx)); |
| ctx->b = apr_brigade_create(f->c->pool); |
| } |
| |
| if (mode == AP_MODE_PEEK) { |
| apr_bucket *e; |
| const char *str; |
| apr_size_t length; |
| |
| /* The purpose of this loop is to ignore any CRLF (or LF) at the end |
| * of a request. Many browsers send extra lines at the end of POST |
| * requests. We use the PEEK method to determine if there is more |
| * data on the socket, so that we know if we should delay sending the |
| * end of one request until we have served the second request in a |
| * pipelined situation. We don't want to actually delay sending a |
| * response if the server finds a CRLF (or LF), becuause that doesn't |
| * mean that there is another request, just a blank line. |
| */ |
| while (1) { |
| if (APR_BRIGADE_EMPTY(ctx->b)) { |
| e = NULL; |
| } |
| else { |
| e = APR_BRIGADE_FIRST(ctx->b); |
| } |
| if (!e || apr_bucket_read(e, &str, &length, APR_NONBLOCK_READ) != APR_SUCCESS) { |
| return APR_EOF; |
| } |
| else { |
| const char *c = str; |
| while (c - str < length) { |
| if (*c == APR_ASCII_LF) |
| c++; |
| else if (*c == APR_ASCII_CR && *(c + 1) == APR_ASCII_LF) |
| c += 2; |
| else return APR_SUCCESS; |
| } |
| apr_bucket_delete(e); |
| } |
| } |
| } |
| |
| if (APR_BRIGADE_EMPTY(ctx->b)) { |
| if ((rv = ap_get_brigade(f->next, ctx->b, mode, readbytes)) != APR_SUCCESS) { |
| return rv; |
| } |
| } |
| |
| if (*readbytes) { |
| while (!APR_BRIGADE_EMPTY(ctx->b)) { |
| const char *ignore; |
| |
| e = APR_BRIGADE_FIRST(ctx->b); |
| if ((rv = apr_bucket_read(e, &ignore, &len, mode)) != APR_SUCCESS) { |
| /* probably APR_IS_EAGAIN(rv); socket state isn't correct; |
| * remove log once we get this squared away */ |
| ap_log_error(APLOG_MARK, APLOG_ERR, rv, f->c->base_server, |
| "apr_bucket_read"); |
| return rv; |
| } |
| |
| if (len) { |
| /* note: this can sometimes insert empty buckets into the |
| * brigade, or the data might come in a few characters at |
| * a time - don't assume that one call to apr_bucket_read() |
| * will return the full string. |
| */ |
| if (*readbytes < len) { |
| apr_bucket_split(e, *readbytes); |
| *readbytes = 0; |
| } |
| else { |
| *readbytes -= len; |
| } |
| APR_BUCKET_REMOVE(e); |
| APR_BRIGADE_INSERT_TAIL(b, e); |
| break; /* once we've gotten some data, deliver it to caller */ |
| } |
| apr_bucket_delete(e); |
| } |
| if (*readbytes == 0) { |
| apr_bucket *eos = apr_bucket_eos_create(); |
| |
| APR_BRIGADE_INSERT_TAIL(b, eos); |
| } |
| return APR_SUCCESS; |
| } |
| |
| while (!APR_BRIGADE_EMPTY(ctx->b)) { |
| e = APR_BRIGADE_FIRST(ctx->b); |
| if ((rv = apr_bucket_read(e, (const char **)&buff, &len, mode)) != APR_SUCCESS) { |
| return rv; |
| } |
| |
| pos = memchr(buff, APR_ASCII_LF, len); |
| if (pos != NULL) { |
| apr_bucket_split(e, pos - buff + 1); |
| APR_BUCKET_REMOVE(e); |
| APR_BRIGADE_INSERT_TAIL(b, e); |
| return APR_SUCCESS; |
| } |
| APR_BUCKET_REMOVE(e); |
| APR_BRIGADE_INSERT_TAIL(b, e); |
| } |
| return APR_SUCCESS; |
| } |
| |
| /* New Apache routine to map status codes into array indicies |
| * e.g. 100 -> 0, 101 -> 1, 200 -> 2 ... |
| * The number of status lines must equal the value of RESPONSE_CODES (httpd.h) |
| * and must be listed in order. |
| */ |
| |
| #ifdef UTS21 |
| /* The second const triggers an assembler bug on UTS 2.1. |
| * Another workaround is to move some code out of this file into another, |
| * but this is easier. Dave Dykstra, 3/31/99 |
| */ |
| static const char * status_lines[RESPONSE_CODES] = |
| #else |
| static const char * const status_lines[RESPONSE_CODES] = |
| #endif |
| { |
| "100 Continue", |
| "101 Switching Protocols", |
| "102 Processing", |
| #define LEVEL_200 3 |
| "200 OK", |
| "201 Created", |
| "202 Accepted", |
| "203 Non-Authoritative Information", |
| "204 No Content", |
| "205 Reset Content", |
| "206 Partial Content", |
| "207 Multi-Status", |
| #define LEVEL_300 11 |
| "300 Multiple Choices", |
| "301 Moved Permanently", |
| "302 Found", |
| "303 See Other", |
| "304 Not Modified", |
| "305 Use Proxy", |
| "306 unused", |
| "307 Temporary Redirect", |
| #define LEVEL_400 19 |
| "400 Bad Request", |
| "401 Authorization Required", |
| "402 Payment Required", |
| "403 Forbidden", |
| "404 Not Found", |
| "405 Method Not Allowed", |
| "406 Not Acceptable", |
| "407 Proxy Authentication Required", |
| "408 Request Time-out", |
| "409 Conflict", |
| "410 Gone", |
| "411 Length Required", |
| "412 Precondition Failed", |
| "413 Request Entity Too Large", |
| "414 Request-URI Too Large", |
| "415 Unsupported Media Type", |
| "416 Requested Range Not Satisfiable", |
| "417 Expectation Failed", |
| "418 unused", |
| "419 unused", |
| "420 unused", |
| "421 unused", |
| "422 Unprocessable Entity", |
| "423 Locked", |
| "424 Failed Dependency", |
| #define LEVEL_500 44 |
| "500 Internal Server Error", |
| "501 Method Not Implemented", |
| "502 Bad Gateway", |
| "503 Service Temporarily Unavailable", |
| "504 Gateway Time-out", |
| "505 HTTP Version Not Supported", |
| "506 Variant Also Negotiates", |
| "507 Insufficient Storage", |
| "508 unused", |
| "509 unused", |
| "510 Not Extended" |
| }; |
| |
| /* The index is found by its offset from the x00 code of each level. |
| * Although this is fast, it will need to be replaced if some nutcase |
| * decides to define a high-numbered code before the lower numbers. |
| * If that sad event occurs, replace the code below with a linear search |
| * from status_lines[shortcut[i]] to status_lines[shortcut[i+1]-1]; |
| */ |
| AP_DECLARE(int) ap_index_of_response(int status) |
| { |
| static int shortcut[6] = {0, LEVEL_200, LEVEL_300, LEVEL_400, |
| LEVEL_500, RESPONSE_CODES}; |
| int i, pos; |
| |
| if (status < 100) /* Below 100 is illegal for HTTP status */ |
| return LEVEL_500; |
| |
| for (i = 0; i < 5; i++) { |
| status -= 100; |
| if (status < 100) { |
| pos = (status + shortcut[i]); |
| if (pos < shortcut[i + 1]) { |
| return pos; |
| } |
| else { |
| return LEVEL_500; /* status unknown (falls in gap) */ |
| } |
| } |
| } |
| return LEVEL_500; /* 600 or above is also illegal */ |
| } |
| |
| AP_DECLARE(const char *) ap_get_status_line(int status) |
| { |
| return status_lines[ap_index_of_response(status)]; |
| } |
| |
| typedef struct header_struct { |
| apr_pool_t *pool; |
| apr_bucket_brigade *bb; |
| } header_struct; |
| |
| /* Send a single HTTP header field to the client. Note that this function |
| * is used in calls to table_do(), so their interfaces are co-dependent. |
| * In other words, don't change this one without checking table_do in alloc.c. |
| * It returns true unless there was a write error of some kind. |
| */ |
| static int form_header_field(header_struct *h, |
| const char *fieldname, const char *fieldval) |
| { |
| char *headfield; |
| |
| headfield = apr_pstrcat(h->pool, fieldname, ": ", fieldval, CRLF, NULL); |
| ap_xlate_proto_to_ascii(headfield, strlen(headfield)); |
| apr_brigade_puts(h->bb, NULL, NULL, headfield); |
| return 1; |
| } |
| |
| /* |
| * Determine the protocol to use for the response. Potentially downgrade |
| * to HTTP/1.0 in some situations and/or turn off keepalives. |
| * |
| * also prepare r->status_line. |
| */ |
| static void basic_http_header_check(request_rec *r, |
| const char **protocol) |
| { |
| if (r->assbackwards) { |
| /* no such thing as a response protocol */ |
| return; |
| } |
| |
| if (!r->status_line) |
| r->status_line = status_lines[ap_index_of_response(r->status)]; |
| |
| /* kluge around broken browsers when indicated by force-response-1.0 |
| */ |
| if (r->proto_num == HTTP_VERSION(1,0) |
| && apr_table_get(r->subprocess_env, "force-response-1.0")) { |
| |
| *protocol = "HTTP/1.0"; |
| r->connection->keepalive = -1; |
| } |
| else { |
| *protocol = AP_SERVER_PROTOCOL; |
| } |
| } |
| |
| /* fill "bb" with a barebones/initial HTTP response header */ |
| static void basic_http_header(request_rec *r, apr_bucket_brigade *bb, |
| const char *protocol) |
| { |
| char *date = NULL; |
| char *tmp; |
| header_struct h; |
| |
| if (r->assbackwards) { |
| /* there are no headers to send */ |
| return; |
| } |
| |
| /* Output the HTTP/1.x Status-Line and the Date and Server fields */ |
| |
| tmp = apr_pstrcat(r->pool, protocol, " ", r->status_line, CRLF, NULL); |
| ap_xlate_proto_to_ascii(tmp, strlen(tmp)); |
| apr_brigade_puts(bb, NULL, NULL, tmp); |
| |
| date = apr_palloc(r->pool, APR_RFC822_DATE_LEN); |
| apr_rfc822_date(date, r->request_time); |
| |
| h.pool = r->pool; |
| h.bb = bb; |
| form_header_field(&h, "Date", date); |
| form_header_field(&h, "Server", ap_get_server_version()); |
| |
| apr_table_unset(r->headers_out, "Date"); /* Avoid bogosity */ |
| apr_table_unset(r->headers_out, "Server"); |
| } |
| |
| AP_DECLARE(void) ap_basic_http_header(request_rec *r, apr_bucket_brigade *bb) |
| { |
| const char *protocol; |
| |
| basic_http_header_check(r, &protocol); |
| basic_http_header(r, bb, protocol); |
| } |
| |
| /* Navigator versions 2.x, 3.x and 4.0 betas up to and including 4.0b2 |
| * have a header parsing bug. If the terminating \r\n occur starting |
| * at offset 256, 257 or 258 of output then it will not properly parse |
| * the headers. Curiously it doesn't exhibit this problem at 512, 513. |
| * We are guessing that this is because their initial read of a new request |
| * uses a 256 byte buffer, and subsequent reads use a larger buffer. |
| * So the problem might exist at different offsets as well. |
| * |
| * This should also work on keepalive connections assuming they use the |
| * same small buffer for the first read of each new request. |
| * |
| * At any rate, we check the bytes written so far and, if we are about to |
| * tickle the bug, we instead insert a bogus padding header. Since the bug |
| * manifests as a broken image in Navigator, users blame the server. :( |
| * It is more expensive to check the User-Agent than it is to just add the |
| * bytes, so we haven't used the BrowserMatch feature here. |
| */ |
| static void terminate_header(apr_bucket_brigade *bb) |
| { |
| char tmp[] = "X-Pad: avoid browser bug" CRLF; |
| char crlf[] = CRLF; |
| apr_ssize_t len; |
| |
| (void) apr_brigade_length(bb, 1, &len); |
| |
| if (len >= 255 && len <= 257) { |
| ap_xlate_proto_to_ascii(tmp, strlen(tmp)); |
| apr_brigade_puts(bb, NULL, NULL, tmp); |
| } |
| ap_xlate_proto_to_ascii(crlf, strlen(crlf)); |
| apr_brigade_puts(bb, NULL, NULL, crlf); |
| } |
| |
| /* Build the Allow field-value from the request handler method mask. |
| * Note that we always allow TRACE, since it is handled below. |
| */ |
| static char *make_allow(request_rec *r) |
| { |
| char *list; |
| int mask; |
| |
| mask = r->allowed_methods->method_mask; |
| list = apr_pstrcat(r->pool, |
| (mask & (1 << M_GET)) ? ", GET, HEAD" : "", |
| (mask & (1 << M_POST)) ? ", POST" : "", |
| (mask & (1 << M_PUT)) ? ", PUT" : "", |
| (mask & (1 << M_DELETE)) ? ", DELETE" : "", |
| (mask & (1 << M_CONNECT)) ? ", CONNECT" : "", |
| (mask & (1 << M_OPTIONS)) ? ", OPTIONS" : "", |
| (mask & (1 << M_PATCH)) ? ", PATCH" : "", |
| (mask & (1 << M_PROPFIND)) ? ", PROPFIND" : "", |
| (mask & (1 << M_PROPPATCH)) ? ", PROPPATCH" : "", |
| (mask & (1 << M_MKCOL)) ? ", MKCOL" : "", |
| (mask & (1 << M_COPY)) ? ", COPY" : "", |
| (mask & (1 << M_MOVE)) ? ", MOVE" : "", |
| (mask & (1 << M_LOCK)) ? ", LOCK" : "", |
| (mask & (1 << M_UNLOCK)) ? ", UNLOCK" : "", |
| ", TRACE", |
| NULL); |
| if ((mask & (1 << M_INVALID)) |
| && (r->allowed_methods->method_list != NULL) |
| && (r->allowed_methods->method_list->nelts != 0)) { |
| int i; |
| char **xmethod = (char **) r->allowed_methods->method_list->elts; |
| |
| /* |
| * Append all of the elements of r->allowed_methods->method_list |
| */ |
| for (i = 0; i < r->allowed_methods->method_list->nelts; ++i) { |
| list = apr_pstrcat(r->pool, list, ", ", xmethod[i], NULL); |
| } |
| } |
| /* |
| * Space past the leading ", ". Wastes two bytes, but that's better |
| * than futzing around to find the actual length. |
| */ |
| return list + 2; |
| } |
| |
| AP_DECLARE(int) ap_send_http_trace(request_rec *r) |
| { |
| int rv; |
| |
| /* Get the original request */ |
| while (r->prev) |
| r = r->prev; |
| |
| if ((rv = ap_setup_client_block(r, REQUEST_NO_BODY))) |
| return rv; |
| |
| r->content_type = "message/http"; |
| |
| /* Now we recreate the request, and echo it back */ |
| |
| ap_rvputs(r, r->the_request, CRLF, NULL); |
| |
| apr_table_do((int (*) (void *, const char *, const char *)) |
| form_header_field, (void *) r, r->headers_in, NULL); |
| ap_rputs(CRLF, r); |
| |
| return OK; |
| } |
| |
| int ap_send_http_options(request_rec *r) |
| { |
| if (r->assbackwards) |
| return DECLINED; |
| |
| apr_table_setn(r->headers_out, "Allow", make_allow(r)); |
| |
| /* the request finalization will send an EOS, which will flush all |
| the headers out (including the Allow header) */ |
| |
| return OK; |
| } |
| |
| /* This routine is called by apr_table_do and merges all instances of |
| * the passed field values into a single array that will be further |
| * processed by some later routine. Originally intended to help split |
| * and recombine multiple Vary fields, though it is generic to any field |
| * consisting of comma/space-separated tokens. |
| */ |
| static int uniq_field_values(void *d, const char *key, const char *val) |
| { |
| apr_array_header_t *values; |
| char *start; |
| char *e; |
| char **strpp; |
| int i; |
| |
| values = (apr_array_header_t *)d; |
| |
| e = apr_pstrdup(values->cont, val); |
| |
| do { |
| /* Find a non-empty fieldname */ |
| |
| while (*e == ',' || apr_isspace(*e)) { |
| ++e; |
| } |
| if (*e == '\0') { |
| break; |
| } |
| start = e; |
| while (*e != '\0' && *e != ',' && !apr_isspace(*e)) { |
| ++e; |
| } |
| if (*e != '\0') { |
| *e++ = '\0'; |
| } |
| |
| /* Now add it to values if it isn't already represented. |
| * Could be replaced by a ap_array_strcasecmp() if we had one. |
| */ |
| for (i = 0, strpp = (char **) values->elts; i < values->nelts; |
| ++i, ++strpp) { |
| if (*strpp && strcasecmp(*strpp, start) == 0) { |
| break; |
| } |
| } |
| if (i == values->nelts) { /* if not found */ |
| *(char **)apr_array_push(values) = start; |
| } |
| } while (*e != '\0'); |
| |
| return 1; |
| } |
| |
| /* |
| * Since some clients choke violently on multiple Vary fields, or |
| * Vary fields with duplicate tokens, combine any multiples and remove |
| * any duplicates. |
| */ |
| static void fixup_vary(request_rec *r) |
| { |
| apr_array_header_t *varies; |
| |
| varies = apr_array_make(r->pool, 5, sizeof(char *)); |
| |
| /* Extract all Vary fields from the headers_out, separate each into |
| * its comma-separated fieldname values, and then add them to varies |
| * if not already present in the array. |
| */ |
| apr_table_do((int (*)(void *, const char *, const char *))uniq_field_values, |
| (void *) varies, r->headers_out, "Vary", NULL); |
| |
| /* If we found any, replace old Vary fields with unique-ified value */ |
| |
| if (varies->nelts > 0) { |
| apr_table_setn(r->headers_out, "Vary", |
| apr_array_pstrcat(r->pool, varies, ',')); |
| } |
| } |
| |
| AP_CORE_DECLARE_NONSTD(apr_status_t) ap_http_header_filter( |
| ap_filter_t *f, |
| apr_bucket_brigade *b) |
| { |
| int i; |
| char *date = NULL; |
| request_rec *r = f->r; |
| const char *clheader; |
| const char *protocol; |
| apr_bucket *e; |
| apr_bucket_brigade *b2; |
| header_struct h; |
| |
| AP_DEBUG_ASSERT(!r->main); |
| |
| APR_BRIGADE_FOREACH(e, b) { |
| if (e->type == &ap_bucket_type_error) { |
| ap_bucket_error *eb = e->data; |
| |
| ap_die(eb->status, r); |
| return AP_FILTER_ERROR; |
| } |
| } |
| |
| if (r->assbackwards) { |
| r->bytes_sent = 0; |
| r->sent_bodyct = 1; |
| ap_remove_output_filter(f); |
| return ap_pass_brigade(f->next, b); |
| } |
| |
| /* |
| * Now that we are ready to send a response, we need to combine the two |
| * header field tables into a single table. If we don't do this, our |
| * later attempts to set or unset a given fieldname might be bypassed. |
| */ |
| if (!apr_is_empty_table(r->err_headers_out)) |
| r->headers_out = apr_table_overlay(r->pool, r->err_headers_out, |
| r->headers_out); |
| |
| /* |
| * Remove the 'Vary' header field if the client can't handle it. |
| * Since this will have nasty effects on HTTP/1.1 caches, force |
| * the response into HTTP/1.0 mode. |
| * |
| * Note: the force-response-1.0 should come before the call to |
| * basic_http_header_check() |
| */ |
| if (apr_table_get(r->subprocess_env, "force-no-vary") != NULL) { |
| apr_table_unset(r->headers_out, "Vary"); |
| r->proto_num = HTTP_VERSION(1,0); |
| apr_table_set(r->subprocess_env, "force-response-1.0", "1"); |
| } |
| else { |
| fixup_vary(r); |
| } |
| |
| /* determine the protocol and whether we should use keepalives. */ |
| basic_http_header_check(r, &protocol); |
| ap_set_keepalive(r); |
| |
| if (r->chunked) { |
| apr_table_mergen(r->headers_out, "Transfer-Encoding", "chunked"); |
| apr_table_unset(r->headers_out, "Content-Length"); |
| |
| } |
| |
| apr_table_setn(r->headers_out, "Content-Type", ap_make_content_type(r, |
| r->content_type)); |
| |
| if (r->content_encoding) { |
| apr_table_setn(r->headers_out, "Content-Encoding", |
| r->content_encoding); |
| } |
| |
| if (r->content_languages && r->content_languages->nelts) { |
| for (i = 0; i < r->content_languages->nelts; ++i) { |
| apr_table_mergen(r->headers_out, "Content-Language", |
| ((char **) (r->content_languages->elts))[i]); |
| } |
| } |
| else if (r->content_language) { |
| apr_table_setn(r->headers_out, "Content-Language", |
| r->content_language); |
| } |
| |
| /* |
| * Control cachability for non-cachable responses if not already set by |
| * some other part of the server configuration. |
| */ |
| if (r->no_cache && !apr_table_get(r->headers_out, "Expires")) { |
| date = apr_palloc(r->pool, APR_RFC822_DATE_LEN); |
| apr_rfc822_date(date, r->request_time); |
| apr_table_addn(r->headers_out, "Expires", date); |
| } |
| |
| /* This is a hack, but I can't find anyway around it. The idea is that |
| * we don't want to send out 0 Content-Lengths if it is a head request. |
| * This happens when modules try to outsmart the server, and return |
| * if they see a HEAD request. Apache 1.3 handlers were supposed to |
| * just return in that situation, and the core handled the HEAD. In |
| * 2.0, if a handler returns, then the core sends an EOS bucket down |
| * the filter stack, and the content-length filter computes a C-L of |
| * zero and that gets put in the headers, and we end up sending a |
| * zero C-L to the client. We can't just remove the C-L filter, |
| * because well behaved 2.0 handlers will send their data down the stack, |
| * and we will compute a real C-L for the head request. RBB |
| */ |
| if (r->header_only && |
| (clheader = apr_table_get(r->headers_out, "Content-Length")) && |
| !strcmp(clheader, "0")) { |
| apr_table_unset(r->headers_out, "Content-Length"); |
| } |
| |
| b2 = apr_brigade_create(r->pool); |
| basic_http_header(r, b2, protocol); |
| |
| h.pool = r->pool; |
| h.bb = b2; |
| |
| if (r->status == HTTP_NOT_MODIFIED) { |
| apr_table_do((int (*)(void *, const char *, const char *)) form_header_field, |
| (void *) &h, r->headers_out, |
| "Connection", |
| "Keep-Alive", |
| "ETag", |
| "Content-Location", |
| "Expires", |
| "Cache-Control", |
| "Vary", |
| "Warning", |
| "WWW-Authenticate", |
| "Proxy-Authenticate", |
| NULL); |
| } |
| else { |
| apr_table_do((int (*) (void *, const char *, const char *)) form_header_field, |
| (void *) &h, r->headers_out, NULL); |
| } |
| |
| terminate_header(b2); |
| |
| r->sent_bodyct = 1; /* Whatever follows is real body stuff... */ |
| |
| ap_pass_brigade(f->next, b2); |
| |
| if (r->header_only) { |
| apr_brigade_destroy(b); |
| return OK; |
| } |
| |
| if (r->chunked) { |
| /* We can't add this filter until we have already sent the headers. |
| * If we add it before this point, then the headers will be chunked |
| * as well, and that is just wrong. |
| */ |
| ap_add_output_filter("CHUNK", NULL, r, r->connection); |
| } |
| |
| /* Don't remove this filter until after we have added the CHUNK filter. |
| * Otherwise, f->next won't be the CHUNK filter and thus the first |
| * brigade won't be chunked properly. |
| */ |
| ap_remove_output_filter(f); |
| return ap_pass_brigade(f->next, b); |
| } |
| |
| /* Here we deal with getting the request message body from the client. |
| * Whether or not the request contains a body is signaled by the presence |
| * of a non-zero Content-Length or by a Transfer-Encoding: chunked. |
| * |
| * Note that this is more complicated than it was in Apache 1.1 and prior |
| * versions, because chunked support means that the module does less. |
| * |
| * The proper procedure is this: |
| * |
| * 1. Call setup_client_block() near the beginning of the request |
| * handler. This will set up all the necessary properties, and will |
| * return either OK, or an error code. If the latter, the module should |
| * return that error code. The second parameter selects the policy to |
| * apply if the request message indicates a body, and how a chunked |
| * transfer-coding should be interpreted. Choose one of |
| * |
| * REQUEST_NO_BODY Send 413 error if message has any body |
| * REQUEST_CHUNKED_ERROR Send 411 error if body without Content-Length |
| * REQUEST_CHUNKED_DECHUNK If chunked, remove the chunks for me. |
| * |
| * In order to use the last two options, the caller MUST provide a buffer |
| * large enough to hold a chunk-size line, including any extensions. |
| * |
| * 2. When you are ready to read a body (if any), call should_client_block(). |
| * This will tell the module whether or not to read input. If it is 0, |
| * the module should assume that there is no message body to read. |
| * This step also sends a 100 Continue response to HTTP/1.1 clients, |
| * so should not be called until the module is *definitely* ready to |
| * read content. (otherwise, the point of the 100 response is defeated). |
| * Never call this function more than once. |
| * |
| * 3. Finally, call get_client_block in a loop. Pass it a buffer and its size. |
| * It will put data into the buffer (not necessarily a full buffer), and |
| * return the length of the input block. When it is done reading, it will |
| * return 0 if EOF, or -1 if there was an error. |
| * If an error occurs on input, we force an end to keepalive. |
| */ |
| |
| AP_DECLARE(int) ap_setup_client_block(request_rec *r, int read_policy) |
| { |
| const char *tenc = apr_table_get(r->headers_in, "Transfer-Encoding"); |
| const char *lenp = apr_table_get(r->headers_in, "Content-Length"); |
| long max_body; |
| |
| r->read_body = read_policy; |
| r->read_chunked = 0; |
| r->remaining = 0; |
| |
| if (tenc) { |
| if (strcasecmp(tenc, "chunked")) { |
| ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r, |
| "Unknown Transfer-Encoding %s", tenc); |
| return HTTP_NOT_IMPLEMENTED; |
| } |
| if (r->read_body == REQUEST_CHUNKED_ERROR) { |
| ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r, |
| "chunked Transfer-Encoding forbidden: %s", r->uri); |
| return (lenp) ? HTTP_BAD_REQUEST : HTTP_LENGTH_REQUIRED; |
| } |
| |
| r->read_chunked = 1; |
| ap_add_input_filter("DECHUNK", NULL, r, r->connection); |
| } |
| else if (lenp) { |
| const char *pos = lenp; |
| |
| while (apr_isdigit(*pos) || apr_isspace(*pos)) { |
| ++pos; |
| } |
| if (*pos != '\0') { |
| ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r, |
| "Invalid Content-Length %s", lenp); |
| return HTTP_BAD_REQUEST; |
| } |
| |
| r->remaining = atol(lenp); |
| } |
| |
| if ((r->read_body == REQUEST_NO_BODY) && |
| (r->read_chunked || (r->remaining > 0))) { |
| ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r, |
| "%s with body is not allowed for %s", r->method, r->uri); |
| return HTTP_REQUEST_ENTITY_TOO_LARGE; |
| } |
| |
| max_body = ap_get_limit_req_body(r); |
| if (max_body && (r->remaining > max_body)) { |
| ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r, |
| "Request content-length of %s is larger than " |
| "the configured limit of %lu", lenp, max_body); |
| return HTTP_REQUEST_ENTITY_TOO_LARGE; |
| } |
| |
| #ifdef AP_DEBUG |
| { |
| /* Make sure ap_getline() didn't leave any droppings. */ |
| core_request_config *req_cfg = |
| (core_request_config *)ap_get_module_config(r->request_config, |
| &core_module); |
| AP_DEBUG_ASSERT(APR_BRIGADE_EMPTY(req_cfg->bb)); |
| } |
| #endif |
| |
| return OK; |
| } |
| |
| AP_DECLARE(int) ap_should_client_block(request_rec *r) |
| { |
| /* First check if we have already read the request body */ |
| |
| if (r->read_length || (!r->read_chunked && (r->remaining <= 0))) |
| return 0; |
| |
| if (r->expecting_100 && r->proto_num >= HTTP_VERSION(1,1)) { |
| char *tmp; |
| apr_bucket *e; |
| apr_bucket_brigade *bb; |
| |
| /* sending 100 Continue interim response */ |
| tmp = apr_pstrcat(r->pool, AP_SERVER_PROTOCOL, " ", status_lines[0], |
| CRLF CRLF, NULL); |
| bb = apr_brigade_create(r->pool); |
| e = apr_bucket_pool_create(tmp, strlen(tmp), r->pool); |
| APR_BRIGADE_INSERT_HEAD(bb, e); |
| e = apr_bucket_flush_create(); |
| APR_BRIGADE_INSERT_TAIL(bb, e); |
| |
| ap_pass_brigade(r->connection->output_filters, bb); |
| } |
| |
| return 1; |
| } |
| |
| static long get_chunk_size(char *b) |
| { |
| long chunksize = 0; |
| |
| while (apr_isxdigit(*b)) { |
| int xvalue = 0; |
| |
| if (*b >= '0' && *b <= '9') { |
| xvalue = *b - '0'; |
| } |
| else if (*b >= 'A' && *b <= 'F') { |
| xvalue = *b - 'A' + 0xa; |
| } |
| else if (*b >= 'a' && *b <= 'f') { |
| xvalue = *b - 'a' + 0xa; |
| } |
| |
| chunksize = (chunksize << 4) | xvalue; |
| ++b; |
| } |
| |
| return chunksize; |
| } |
| |
| /* get_client_block is called in a loop to get the request message body. |
| * This is quite simple if the client includes a content-length |
| * (the normal case), but gets messy if the body is chunked. Note that |
| * r->remaining is used to maintain state across calls and that |
| * r->read_length is the total number of bytes given to the caller |
| * across all invocations. It is messy because we have to be careful not |
| * to read past the data provided by the client, since these reads block. |
| * Returns 0 on End-of-body, -1 on error or premature chunk end. |
| * |
| * Reading the chunked encoding requires a buffer size large enough to |
| * hold a chunk-size line, including any extensions. For now, we'll leave |
| * that to the caller, at least until we can come up with a better solution. |
| */ |
| AP_DECLARE(long) ap_get_client_block(request_rec *r, char *buffer, int bufsiz) |
| { |
| apr_size_t len_read, total; |
| apr_status_t rv; |
| apr_bucket *b, *old; |
| const char *tempbuf; |
| core_request_config *req_cfg = |
| (core_request_config *)ap_get_module_config(r->request_config, |
| &core_module); |
| apr_bucket_brigade *bb = req_cfg->bb; |
| |
| do { |
| if (APR_BRIGADE_EMPTY(bb)) { |
| if (ap_get_brigade(r->input_filters, bb, AP_MODE_BLOCKING, &r->remaining) != APR_SUCCESS) { |
| /* if we actually fail here, we want to just return and |
| * stop trying to read data from the client. |
| */ |
| r->connection->keepalive = -1; |
| apr_brigade_destroy(bb); |
| return -1; |
| } |
| } |
| b = APR_BRIGADE_FIRST(bb); |
| } while (APR_BRIGADE_EMPTY(bb)); |
| |
| if (APR_BUCKET_IS_EOS(b)) { /* reached eos on previous invocation */ |
| apr_bucket_delete(b); |
| return 0; |
| } |
| |
| total = 0; |
| while (total < bufsiz && b != APR_BRIGADE_SENTINEL(bb) && !APR_BUCKET_IS_EOS(b)) { |
| if ((rv = apr_bucket_read(b, &tempbuf, &len_read, APR_BLOCK_READ)) != APR_SUCCESS) { |
| return -1; |
| } |
| if (total + len_read > bufsiz) { |
| apr_bucket_split(b, bufsiz - total); |
| len_read = bufsiz - total; |
| } |
| memcpy(buffer, tempbuf, len_read); |
| buffer += len_read; |
| total += len_read; |
| /* XXX the next two fields shouldn't be mucked with here, as they are in terms |
| * of bytes in the unfiltered body; gotta see if anybody else actually uses |
| * these |
| */ |
| r->read_length += len_read; /* XXX yank me? */ |
| r->remaining -= len_read; /* XXX yank me? */ |
| old = b; |
| b = APR_BUCKET_NEXT(b); |
| apr_bucket_delete(old); |
| } |
| |
| return total; |
| } |
| |
| /* In HTTP/1.1, any method can have a body. However, most GET handlers |
| * wouldn't know what to do with a request body if they received one. |
| * This helper routine tests for and reads any message body in the request, |
| * simply discarding whatever it receives. We need to do this because |
| * failing to read the request body would cause it to be interpreted |
| * as the next request on a persistent connection. |
| * |
| * Since we return an error status if the request is malformed, this |
| * routine should be called at the beginning of a no-body handler, e.g., |
| * |
| * if ((retval = ap_discard_request_body(r)) != OK) |
| * return retval; |
| */ |
| AP_DECLARE(int) ap_discard_request_body(request_rec *r) |
| { |
| int rv; |
| |
| if (r->read_length == 0) { /* if not read already */ |
| if ((rv = ap_setup_client_block(r, REQUEST_CHUNKED_DECHUNK))) |
| return rv; |
| } |
| |
| /* In order to avoid sending 100 Continue when we already know the |
| * final response status, and yet not kill the connection if there is |
| * no request body to be read, we need to duplicate the test from |
| * ap_should_client_block() here negated rather than call it directly. |
| */ |
| if ((r->read_length == 0) && (r->read_chunked || (r->remaining > 0))) { |
| char dumpbuf[HUGE_STRING_LEN]; |
| |
| if (r->expecting_100) { |
| r->connection->keepalive = -1; |
| return OK; |
| } |
| |
| while ((rv = ap_get_client_block(r, dumpbuf, HUGE_STRING_LEN)) > 0) |
| continue; |
| |
| if (rv < 0) |
| return HTTP_BAD_REQUEST; |
| } |
| return OK; |
| } |
| |
| static const char *add_optional_notes(request_rec *r, |
| const char *prefix, |
| const char *key, |
| const char *suffix) |
| { |
| const char *notes, *result; |
| |
| if ((notes = apr_table_get(r->notes, key)) == NULL) { |
| result = prefix; |
| } |
| else { |
| result = apr_pstrcat(r->pool, prefix, notes, suffix, NULL); |
| } |
| |
| return result; |
| } |
| |
| static const char *get_canned_error_string(int status, |
| request_rec *r, |
| const char *location) |
| |
| /* construct and return the default error message for a given |
| * HTTP defined error code |
| */ |
| { |
| apr_pool_t *p = r->pool; |
| const char *error_notes, *h1, *s1; |
| |
| switch (status) { |
| case HTTP_MOVED_PERMANENTLY: |
| case HTTP_MOVED_TEMPORARILY: |
| case HTTP_TEMPORARY_REDIRECT: |
| return(apr_pstrcat(p, |
| "The document has moved <A HREF=\"", |
| ap_escape_html(r->pool, location), |
| "\">here</A>.<P>\n", |
| NULL)); |
| case HTTP_SEE_OTHER: |
| return(apr_pstrcat(p, |
| "The answer to your request is located <A HREF=\"", |
| ap_escape_html(r->pool, location), |
| "\">here</A>.<P>\n", |
| NULL)); |
| case HTTP_USE_PROXY: |
| return(apr_pstrcat(p, |
| "This resource is only accessible " |
| "through the proxy\n", |
| ap_escape_html(r->pool, location), |
| "<BR>\nYou will need to " |
| "configure your client to use that proxy.<P>\n", |
| NULL)); |
| case HTTP_PROXY_AUTHENTICATION_REQUIRED: |
| case HTTP_UNAUTHORIZED: |
| return("This server could not verify that you\n" |
| "are authorized to access the document\n" |
| "requested. Either you supplied the wrong\n" |
| "credentials (e.g., bad password), or your\n" |
| "browser doesn't understand how to supply\n" |
| "the credentials required.<P>\n"); |
| case HTTP_BAD_REQUEST: |
| return(add_optional_notes(r, |
| "Your browser sent a request that " |
| "this server could not understand.<P>\n", |
| "error-notes", |
| "<P>\n")); |
| case HTTP_FORBIDDEN: |
| return(apr_pstrcat(p, |
| "You don't have permission to access ", |
| ap_escape_html(r->pool, r->uri), |
| "\non this server.<P>\n", |
| NULL)); |
| case HTTP_NOT_FOUND: |
| return(apr_pstrcat(p, |
| "The requested URL ", |
| ap_escape_html(r->pool, r->uri), |
| " was not found on this server.<P>\n", |
| NULL)); |
| case HTTP_METHOD_NOT_ALLOWED: |
| return(apr_pstrcat(p, |
| "The requested method ", r->method, |
| " is not allowed for the URL ", |
| ap_escape_html(r->pool, r->uri), |
| ".<P>\n", |
| NULL)); |
| case HTTP_NOT_ACCEPTABLE: |
| s1 = apr_pstrcat(p, |
| "An appropriate representation of the " |
| "requested resource ", |
| ap_escape_html(r->pool, r->uri), |
| " could not be found on this server.<P>\n", |
| NULL); |
| return(add_optional_notes(r, s1, "variant-list", "")); |
| case HTTP_MULTIPLE_CHOICES: |
| return(add_optional_notes(r, "", "variant-list", "")); |
| case HTTP_LENGTH_REQUIRED: |
| s1 = apr_pstrcat(p, |
| "A request of the requested method ", |
| r->method, |
| " requires a valid Content-length.<P>\n", |
| NULL); |
| return(add_optional_notes(r, s1, "error-notes", "<P>\n")); |
| case HTTP_PRECONDITION_FAILED: |
| return(apr_pstrcat(p, |
| "The precondition on the request for the URL ", |
| ap_escape_html(r->pool, r->uri), |
| " evaluated to false.<P>\n", |
| NULL)); |
| case HTTP_NOT_IMPLEMENTED: |
| s1 = apr_pstrcat(p, |
| ap_escape_html(r->pool, r->method), " to ", |
| ap_escape_html(r->pool, r->uri), |
| " not supported.<P>\n", |
| NULL); |
| return(add_optional_notes(r, s1, "error-notes", "<P>\n")); |
| case HTTP_BAD_GATEWAY: |
| s1 = "The proxy server received an invalid" CRLF |
| "response from an upstream server.<P>" CRLF; |
| return(add_optional_notes(r, s1, "error-notes", "<P>\n")); |
| case HTTP_VARIANT_ALSO_VARIES: |
| return(apr_pstrcat(p, |
| "A variant for the requested resource\n<PRE>\n", |
| ap_escape_html(r->pool, r->uri), |
| "\n</PRE>\nis itself a negotiable resource. " |
| "This indicates a configuration error.<P>\n", |
| NULL)); |
| case HTTP_REQUEST_TIME_OUT: |
| return("I'm tired of waiting for your request.\n"); |
| case HTTP_GONE: |
| return(apr_pstrcat(p, |
| "The requested resource<BR>", |
| ap_escape_html(r->pool, r->uri), |
| "<BR>\nis no longer available on this server " |
| "and there is no forwarding address.\n" |
| "Please remove all references to this resource.\n", |
| NULL)); |
| case HTTP_REQUEST_ENTITY_TOO_LARGE: |
| return(apr_pstrcat(p, |
| "The requested resource<BR>", |
| ap_escape_html(r->pool, r->uri), "<BR>\n", |
| "does not allow request data with ", |
| r->method, |
| " requests, or the amount of data provided in\n" |
| "the request exceeds the capacity limit.\n", |
| NULL)); |
| case HTTP_REQUEST_URI_TOO_LARGE: |
| s1 = "The requested URL's length exceeds the capacity\n" |
| "limit for this server.<P>\n"; |
| return(add_optional_notes(r, s1, "error-notes", "<P>\n")); |
| case HTTP_UNSUPPORTED_MEDIA_TYPE: |
| return("The supplied request data is not in a format\n" |
| "acceptable for processing by this resource.\n"); |
| case HTTP_RANGE_NOT_SATISFIABLE: |
| return("None of the range-specifier values in the Range\n" |
| "request-header field overlap the current extent\n" |
| "of the selected resource.\n"); |
| case HTTP_EXPECTATION_FAILED: |
| return(apr_pstrcat(p, |
| "The expectation given in the Expect request-header" |
| "\nfield could not be met by this server.<P>\n" |
| "The client sent<PRE>\n Expect: ", |
| apr_table_get(r->headers_in, "Expect"), "\n</PRE>\n" |
| "but we only allow the 100-continue expectation.\n", |
| NULL)); |
| case HTTP_UNPROCESSABLE_ENTITY: |
| return("The server understands the media type of the\n" |
| "request entity, but was unable to process the\n" |
| "contained instructions.\n"); |
| case HTTP_LOCKED: |
| return("The requested resource is currently locked.\n" |
| "The lock must be released or proper identification\n" |
| "given before the method can be applied.\n"); |
| case HTTP_FAILED_DEPENDENCY: |
| return("The method could not be performed on the resource\n" |
| "because the requested action depended on another\n" |
| "action and that other action failed.\n"); |
| case HTTP_INSUFFICIENT_STORAGE: |
| return("The method could not be performed on the resource\n" |
| "because the server is unable to store the\n" |
| "representation needed to successfully complete the\n" |
| "request. There is insufficient free space left in\n" |
| "your storage allocation.\n"); |
| case HTTP_SERVICE_UNAVAILABLE: |
| return("The server is temporarily unable to service your\n" |
| "request due to maintenance downtime or capacity\n" |
| "problems. Please try again later.\n"); |
| case HTTP_GATEWAY_TIME_OUT: |
| return("The proxy server did not receive a timely response\n" |
| "from the upstream server.\n"); |
| case HTTP_NOT_EXTENDED: |
| return("A mandatory extension policy in the request is not\n" |
| "accepted by the server for this resource.\n"); |
| default: /* HTTP_INTERNAL_SERVER_ERROR */ |
| /* |
| * This comparison to expose error-notes could be modified to |
| * use a configuration directive and export based on that |
| * directive. For now "*" is used to designate an error-notes |
| * that is totally safe for any user to see (ie lacks paths, |
| * database passwords, etc.) |
| */ |
| if (((error_notes = apr_table_get(r->notes, "error-notes")) != NULL) |
| && (h1 = apr_table_get(r->notes, "verbose-error-to")) != NULL |
| && (strcmp(h1, "*") == 0)) { |
| return(apr_pstrcat(p, error_notes, "<P>\n", NULL)); |
| } |
| else { |
| return(apr_pstrcat(p, |
| "The server encountered an internal error or\n" |
| "misconfiguration and was unable to complete\n" |
| "your request.<P>\n" |
| "Please contact the server administrator,\n ", |
| ap_escape_html(r->pool, r->server->server_admin), |
| " and inform them of the time the error occurred,\n" |
| "and anything you might have done that may have\n" |
| "caused the error.<P>\n" |
| "More information about this error may be available\n" |
| "in the server error log.<P>\n", |
| NULL)); |
| } |
| /* |
| * It would be nice to give the user the information they need to |
| * fix the problem directly since many users don't have access to |
| * the error_log (think University sites) even though they can easily |
| * get this error by misconfiguring an htaccess file. However, the |
| e error notes tend to include the real file pathname in this case, |
| * which some people consider to be a breach of privacy. Until we |
| * can figure out a way to remove the pathname, leave this commented. |
| * |
| * if ((error_notes = apr_table_get(r->notes, "error-notes")) != NULL) { |
| * return(apr_pstrcat(p, error_notes, "<P>\n", NULL); |
| * } |
| * else { |
| * return ""; |
| * } |
| */ |
| } |
| } |
| |
| static void reset_filters(request_rec *r) |
| { |
| ap_filter_t *f = r->output_filters; |
| |
| while (f) { |
| if (!strcasecmp(f->frec->name, "CORE") || |
| !strcasecmp(f->frec->name, "CONTENT_LENGTH") || |
| !strcasecmp(f->frec->name, "HTTP_HEADER")) { |
| f = f->next; |
| continue; |
| } |
| else { |
| ap_remove_output_filter(f); |
| f = f->next; |
| } |
| } |
| } |
| |
| /* We should have named this send_canned_response, since it is used for any |
| * response that can be generated by the server from the request record. |
| * This includes all 204 (no content), 3xx (redirect), 4xx (client error), |
| * and 5xx (server error) messages that have not been redirected to another |
| * handler via the ErrorDocument feature. |
| */ |
| AP_DECLARE(void) ap_send_error_response(request_rec *r, int recursive_error) |
| { |
| int status = r->status; |
| int idx = ap_index_of_response(status); |
| char *custom_response; |
| const char *location = apr_table_get(r->headers_out, "Location"); |
| |
| /* At this point, we are starting the response over, so we have to reset |
| * this value. |
| */ |
| r->eos_sent = 0; |
| reset_filters(r); |
| |
| /* |
| * It's possible that the Location field might be in r->err_headers_out |
| * instead of r->headers_out; use the latter if possible, else the |
| * former. |
| */ |
| if (location == NULL) { |
| location = apr_table_get(r->err_headers_out, "Location"); |
| } |
| /* We need to special-case the handling of 204 and 304 responses, |
| * since they have specific HTTP requirements and do not include a |
| * message body. Note that being assbackwards here is not an option. |
| */ |
| if (status == HTTP_NOT_MODIFIED) { |
| ap_finalize_request_protocol(r); |
| return; |
| } |
| |
| if (status == HTTP_NO_CONTENT) { |
| ap_finalize_request_protocol(r); |
| return; |
| } |
| |
| if (!r->assbackwards) { |
| apr_table_t *tmp = r->headers_out; |
| |
| /* For all HTTP/1.x responses for which we generate the message, |
| * we need to avoid inheriting the "normal status" header fields |
| * that may have been set by the request handler before the |
| * error or redirect, except for Location on external redirects. |
| */ |
| r->headers_out = r->err_headers_out; |
| r->err_headers_out = tmp; |
| apr_table_clear(r->err_headers_out); |
| |
| if (ap_is_HTTP_REDIRECT(status) || (status == HTTP_CREATED)) { |
| if ((location != NULL) && *location) { |
| apr_table_setn(r->headers_out, "Location", location); |
| } |
| else { |
| location = ""; /* avoids coredump when printing, below */ |
| } |
| } |
| |
| r->content_language = NULL; |
| r->content_languages = NULL; |
| r->content_encoding = NULL; |
| r->clength = 0; |
| r->content_type = "text/html; charset=iso-8859-1"; |
| |
| if ((status == HTTP_METHOD_NOT_ALLOWED) |
| || (status == HTTP_NOT_IMPLEMENTED)) { |
| apr_table_setn(r->headers_out, "Allow", make_allow(r)); |
| } |
| |
| if (r->header_only) { |
| ap_finalize_request_protocol(r); |
| return; |
| } |
| } |
| |
| if ((custom_response = ap_response_code_string(r, idx))) { |
| /* |
| * We have a custom response output. This should only be |
| * a text-string to write back. But if the ErrorDocument |
| * was a local redirect and the requested resource failed |
| * for any reason, the custom_response will still hold the |
| * redirect URL. We don't really want to output this URL |
| * as a text message, so first check the custom response |
| * string to ensure that it is a text-string (using the |
| * same test used in ap_die(), i.e. does it start with a "). |
| * If it doesn't, we've got a recursive error, so find |
| * the original error and output that as well. |
| */ |
| if (custom_response[0] == '\"') { |
| ap_rputs(custom_response + 1, r); |
| ap_finalize_request_protocol(r); |
| return; |
| } |
| /* |
| * Redirect failed, so get back the original error |
| */ |
| while (r->prev && (r->prev->status != HTTP_OK)) |
| r = r->prev; |
| } |
| { |
| const char *title = status_lines[idx]; |
| const char *h1; |
| |
| /* XXX This is a major hack that should be fixed cleanly. The |
| * problem is that we have the information we need in a previous |
| * request, but the text of the page must be sent down the last |
| * request_rec's filter stack. rbb |
| */ |
| request_rec *rlast = r; |
| while (rlast->next) { |
| rlast = rlast->next; |
| } |
| |
| /* Accept a status_line set by a module, but only if it begins |
| * with the 3 digit status code |
| */ |
| if (r->status_line != NULL |
| && strlen(r->status_line) > 4 /* long enough */ |
| && apr_isdigit(r->status_line[0]) |
| && apr_isdigit(r->status_line[1]) |
| && apr_isdigit(r->status_line[2]) |
| && apr_isspace(r->status_line[3]) |
| && apr_isalnum(r->status_line[4])) { |
| title = r->status_line; |
| } |
| |
| /* folks decided they didn't want the error code in the H1 text */ |
| h1 = &title[4]; |
| |
| /* can't count on a charset filter being in place here, |
| * so do ebcdic->ascii translation explicitly (if needed) |
| */ |
| |
| ap_rvputs_proto_in_ascii(rlast, |
| DOCTYPE_HTML_2_0 |
| "<HTML><HEAD>\n<TITLE>", title, |
| "</TITLE>\n</HEAD><BODY>\n<H1>", h1, "</H1>\n", |
| NULL); |
| |
| ap_rvputs_proto_in_ascii(rlast, |
| get_canned_error_string(status, r, location), |
| NULL); |
| |
| if (recursive_error) { |
| ap_rvputs_proto_in_ascii(rlast, "<P>Additionally, a ", |
| status_lines[ap_index_of_response(recursive_error)], |
| "\nerror was encountered while trying to use an " |
| "ErrorDocument to handle the request.\n", NULL); |
| } |
| ap_rvputs_proto_in_ascii(rlast, ap_psignature("<HR>\n", r), NULL); |
| ap_rvputs_proto_in_ascii(rlast, "</BODY></HTML>\n", NULL); |
| } |
| ap_finalize_request_protocol(r); |
| } |
| |
| /* |
| * Create a new method list with the specified number of preallocated |
| * extension slots. |
| */ |
| AP_DECLARE(ap_method_list_t *) ap_make_method_list(apr_pool_t *p, int nelts) |
| { |
| ap_method_list_t *ml; |
| |
| ml = (ap_method_list_t *) apr_palloc(p, sizeof(ap_method_list_t)); |
| ml->method_mask = 0; |
| ml->method_list = apr_array_make(p, sizeof(char *), nelts); |
| return ml; |
| } |
| |
| /* |
| * Make a copy of a method list (primarily for subrequests that may |
| * subsequently change it; don't want them changing the parent's, too!). |
| */ |
| AP_DECLARE(void) ap_copy_method_list(ap_method_list_t *dest, |
| ap_method_list_t *src) |
| { |
| int i; |
| char **imethods; |
| char **omethods; |
| |
| dest->method_mask = src->method_mask; |
| imethods = (char **) src->method_list->elts; |
| for (i = 0; i < src->method_list->nelts; ++i) { |
| omethods = (char **) apr_array_push(dest->method_list); |
| *omethods = apr_pstrdup(dest->method_list->cont, imethods[i]); |
| } |
| } |
| |
| /* |
| * Invoke a callback routine for each method in the specified list. |
| */ |
| AP_DECLARE_NONSTD(void) ap_method_list_do(int (*comp) (void *urec, const char *mname, |
| int mnum), |
| void *rec, |
| const ap_method_list_t *ml, ...) |
| { |
| va_list vp; |
| va_start(vp, ml); |
| ap_method_list_vdo(comp, rec, ml, vp); |
| va_end(vp); |
| } |
| |
| AP_DECLARE(void) ap_method_list_vdo(int (*comp) (void *mrec, |
| const char *mname, |
| int mnum), |
| void *rec, const ap_method_list_t *ml, |
| va_list vp) |
| { |
| |
| } |
| |
| /* |
| * Return true if the specified HTTP method is in the provided |
| * method list. |
| */ |
| AP_DECLARE(int) ap_method_in_list(ap_method_list_t *l, const char *method) |
| { |
| int methnum; |
| int i; |
| char **methods; |
| |
| /* |
| * If it's one of our known methods, use the shortcut and check the |
| * bitmask. |
| */ |
| methnum = ap_method_number_of(method); |
| if (methnum != M_INVALID) { |
| return (l->method_mask & (1 << methnum)); |
| } |
| /* |
| * Otherwise, see if the method name is in the array or string names |
| */ |
| if ((l->method_list == NULL) || (l->method_list->nelts == 0)) { |
| return 0; |
| } |
| methods = (char **)l->method_list->elts; |
| for (i = 0; i < l->method_list->nelts; ++i) { |
| if (strcmp(method, methods[i]) == 0) { |
| return 1; |
| } |
| } |
| return 0; |
| } |
| |
| /* |
| * Add the specified method to a method list (if it isn't already there). |
| */ |
| AP_DECLARE(void) ap_method_list_add(ap_method_list_t *l, const char *method) |
| { |
| int methnum; |
| int i; |
| const char **xmethod; |
| char **methods; |
| |
| /* |
| * If it's one of our known methods, use the shortcut and use the |
| * bitmask. |
| */ |
| methnum = ap_method_number_of(method); |
| l->method_mask |= (1 << methnum); |
| if (methnum != M_INVALID) { |
| return; |
| } |
| /* |
| * Otherwise, see if the method name is in the array of string names. |
| */ |
| if (l->method_list->nelts != 0) { |
| methods = (char **)l->method_list->elts; |
| for (i = 0; i < l->method_list->nelts; ++i) { |
| if (strcmp(method, methods[i]) == 0) { |
| return; |
| } |
| } |
| } |
| xmethod = (const char **) apr_array_push(l->method_list); |
| *xmethod = method; |
| } |
| |
| /* |
| * Remove the specified method from a method list. |
| */ |
| AP_DECLARE(void) ap_method_list_remove(ap_method_list_t *l, |
| const char *method) |
| { |
| int methnum; |
| char **methods; |
| |
| /* |
| * If it's one of our known methods, use the shortcut and use the |
| * bitmask. |
| */ |
| methnum = ap_method_number_of(method); |
| l->method_mask |= ~(1 << methnum); |
| if (methnum != M_INVALID) { |
| return; |
| } |
| /* |
| * Otherwise, see if the method name is in the array of string names. |
| */ |
| if (l->method_list->nelts != 0) { |
| register int i, j, k; |
| methods = (char **)l->method_list->elts; |
| for (i = 0; i < l->method_list->nelts; ) { |
| if (strcmp(method, methods[i]) == 0) { |
| for (j = i, k = i + 1; k < l->method_list->nelts; ++j, ++k) { |
| methods[j] = methods[k]; |
| } |
| --l->method_list->nelts; |
| } |
| else { |
| ++i; |
| } |
| } |
| } |
| } |
| |
| /* |
| * Reset a method list to be completely empty. |
| */ |
| AP_DECLARE(void) ap_clear_method_list(ap_method_list_t *l) |
| { |
| l->method_mask = 0; |
| l->method_list->nelts = 0; |
| } |
| |
| /* |
| * Construct an entity tag (ETag) from resource information. If it's a real |
| * file, build in some of the file characteristics. If the modification time |
| * is newer than (request-time minus 1 second), mark the ETag as weak - it |
| * could be modified again in as short an interval. We rationalize the |
| * modification time we're given to keep it from being in the future. |
| */ |
| AP_DECLARE(char *) ap_make_etag(request_rec *r, int force_weak) |
| { |
| char *etag; |
| char *weak; |
| |
| /* |
| * Make an ETag header out of various pieces of information. We use |
| * the last-modified date and, if we have a real file, the |
| * length and inode number - note that this doesn't have to match |
| * the content-length (i.e. includes), it just has to be unique |
| * for the file. |
| * |
| * If the request was made within a second of the last-modified date, |
| * we send a weak tag instead of a strong one, since it could |
| * be modified again later in the second, and the validation |
| * would be incorrect. |
| */ |
| |
| weak = ((r->request_time - r->mtime > APR_USEC_PER_SEC) |
| && !force_weak) ? "" : "W/"; |
| |
| if (r->finfo.filetype != 0) { |
| etag = apr_psprintf(r->pool, |
| "%s\"%lx-%lx-%lx\"", weak, |
| (unsigned long) r->finfo.inode, |
| (unsigned long) r->finfo.size, |
| (unsigned long) r->mtime); |
| } |
| else { |
| etag = apr_psprintf(r->pool, "%s\"%lx\"", weak, |
| (unsigned long) r->mtime); |
| } |
| |
| return etag; |
| } |
| |
| AP_DECLARE(void) ap_set_etag(request_rec *r) |
| { |
| char *etag; |
| char *variant_etag, *vlv; |
| int vlv_weak; |
| |
| if (!r->vlist_validator) { |
| etag = ap_make_etag(r, 0); |
| } |
| else { |
| /* If we have a variant list validator (vlv) due to the |
| * response being negotiated, then we create a structured |
| * entity tag which merges the variant etag with the variant |
| * list validator (vlv). This merging makes revalidation |
| * somewhat safer, ensures that caches which can deal with |
| * Vary will (eventually) be updated if the set of variants is |
| * changed, and is also a protocol requirement for transparent |
| * content negotiation. |
| */ |
| |
| /* if the variant list validator is weak, we make the whole |
| * structured etag weak. If we would not, then clients could |
| * have problems merging range responses if we have different |
| * variants with the same non-globally-unique strong etag. |
| */ |
| |
| vlv = r->vlist_validator; |
| vlv_weak = (vlv[0] == 'W'); |
| |
| variant_etag = ap_make_etag(r, vlv_weak); |
| |
| /* merge variant_etag and vlv into a structured etag */ |
| |
| variant_etag[strlen(variant_etag) - 1] = '\0'; |
| if (vlv_weak) |
| vlv += 3; |
| else |
| vlv++; |
| etag = apr_pstrcat(r->pool, variant_etag, ";", vlv, NULL); |
| } |
| |
| apr_table_setn(r->headers_out, "ETag", etag); |
| } |
| |
| static int parse_byterange(char *range, apr_off_t clength, |
| apr_off_t *start, apr_off_t *end) |
| { |
| char *dash = strchr(range, '-'); |
| |
| if (!dash) |
| return 0; |
| |
| if ((dash == range)) { |
| /* In the form "-5" */ |
| *start = clength - atol(dash + 1); |
| *end = clength - 1; |
| } |
| else { |
| *dash = '\0'; |
| dash++; |
| *start = atol(range); |
| if (*dash) |
| *end = atol(dash); |
| else /* "5-" */ |
| *end = clength - 1; |
| } |
| |
| if (*start < 0) |
| *start = 0; |
| |
| if (*end >= clength) |
| *end = clength - 1; |
| |
| if (*start > *end) |
| return -1; |
| |
| return (*start > 0 || *end < clength); |
| } |
| |
| static int ap_set_byterange(request_rec *r); |
| |
| typedef struct byterange_ctx { |
| apr_bucket_brigade *bb; |
| int num_ranges; |
| const char *orig_ct; |
| } byterange_ctx; |
| |
| /* |
| * Here we try to be compatible with clients that want multipart/x-byteranges |
| * instead of multipart/byteranges (also see above), as per HTTP/1.1. We |
| * look for the Request-Range header (e.g. Netscape 2 and 3) as an indication |
| * that the browser supports an older protocol. We also check User-Agent |
| * for Microsoft Internet Explorer 3, which needs this as well. |
| */ |
| static int use_range_x(request_rec *r) |
| { |
| const char *ua; |
| return (apr_table_get(r->headers_in, "Request-Range") || |
| ((ua = apr_table_get(r->headers_in, "User-Agent")) |
| && ap_strstr_c(ua, "MSIE 3"))); |
| } |
| |
| #define BYTERANGE_FMT "%" APR_OFF_T_FMT "-%" APR_OFF_T_FMT "/%" APR_OFF_T_FMT |
| |
| AP_CORE_DECLARE_NONSTD(apr_status_t) ap_byterange_filter( |
| ap_filter_t *f, |
| apr_bucket_brigade *bb) |
| { |
| #define MIN_LENGTH(len1, len2) ((len1 > len2) ? len2 : len1) |
| request_rec *r = f->r; |
| byterange_ctx *ctx = f->ctx; |
| apr_bucket *e; |
| apr_bucket_brigade *bsend; |
| apr_off_t range_start; |
| apr_off_t range_end; |
| char *current; |
| char *bound_head; |
| apr_ssize_t bb_length; |
| apr_off_t clength = 0; |
| apr_status_t rv; |
| int found = 0; |
| |
| if (!ctx) { |
| int num_ranges = ap_set_byterange(r); |
| |
| if (num_ranges == -1) { |
| ap_remove_output_filter(f); |
| bsend = apr_brigade_create(r->pool); |
| e = ap_bucket_error_create(HTTP_RANGE_NOT_SATISFIABLE, NULL, r->pool); |
| APR_BRIGADE_INSERT_TAIL(bsend, e); |
| e = apr_bucket_eos_create(); |
| APR_BRIGADE_INSERT_TAIL(bsend, e); |
| return ap_pass_brigade(f->next, bsend); |
| } |
| if (num_ranges == 0) { |
| ap_remove_output_filter(f); |
| return ap_pass_brigade(f->next, bb); |
| } |
| |
| ctx = f->ctx = apr_pcalloc(r->pool, sizeof(*ctx)); |
| ctx->num_ranges = num_ranges; |
| |
| if (num_ranges > 1) { |
| ctx->orig_ct = r->content_type; |
| r->content_type = |
| apr_pstrcat(r->pool, "multipart", use_range_x(r) ? "/x-" : "/", |
| "byteranges; boundary=", r->boundary, NULL); |
| } |
| |
| /* create a brigade in case we never call ap_save_brigade() */ |
| ctx->bb = apr_brigade_create(r->pool); |
| } |
| |
| /* We can't actually deal with byte-ranges until we have the whole brigade |
| * because the byte-ranges can be in any order, and according to the RFC, |
| * we SHOULD return the data in the same order it was requested. |
| */ |
| if (!APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(bb))) { |
| ap_save_brigade(f, &ctx->bb, &bb); |
| return APR_SUCCESS; |
| } |
| |
| /* compute this once (it is an invariant) */ |
| bound_head = apr_pstrcat(r->pool, |
| CRLF "--", r->boundary, |
| CRLF "Content-type: ", |
| ap_make_content_type(r, ctx->orig_ct), |
| CRLF "Content-range: bytes ", |
| NULL); |
| ap_xlate_proto_to_ascii(bound_head, strlen(bound_head)); |
| |
| /* If we have a saved brigade from a previous run, concat the passed |
| * brigade with our saved brigade. Otherwise just continue. |
| */ |
| if (ctx->bb) { |
| APR_BRIGADE_CONCAT(ctx->bb, bb); |
| bb = ctx->bb; |
| ctx->bb = NULL; /* ### strictly necessary? call brigade_destroy? */ |
| } |
| |
| /* It is possible that we won't have a content length yet, so we have to |
| * compute the length before we can actually do the byterange work. |
| */ |
| (void) apr_brigade_length(bb, 1, &bb_length); |
| clength = (apr_off_t)bb_length; |
| |
| /* this brigade holds what we will be sending */ |
| bsend = apr_brigade_create(r->pool); |
| |
| while ((current = ap_getword(r->pool, &r->range, ',')) && |
| (rv = parse_byterange(current, clength, &range_start, &range_end))) { |
| apr_bucket *e2; |
| apr_bucket *ec; |
| |
| if (rv == -1) { |
| continue; |
| } |
| else { |
| found = 1; |
| } |
| |
| if (ctx->num_ranges > 1) { |
| char *ts; |
| |
| e = apr_bucket_pool_create(bound_head, |
| strlen(bound_head), r->pool); |
| APR_BRIGADE_INSERT_TAIL(bsend, e); |
| |
| ts = apr_psprintf(r->pool, BYTERANGE_FMT CRLF CRLF, |
| range_start, range_end, clength); |
| ap_xlate_proto_to_ascii(ts, strlen(ts)); |
| e = apr_bucket_pool_create(ts, strlen(ts), r->pool); |
| APR_BRIGADE_INSERT_TAIL(bsend, e); |
| } |
| |
| e = apr_brigade_partition(bb, range_start); |
| e2 = apr_brigade_partition(bb, range_end + 1); |
| |
| ec = e; |
| do { |
| apr_bucket *foo; |
| const char *str; |
| apr_size_t len; |
| |
| if (apr_bucket_copy(ec, &foo) != APR_SUCCESS) { |
| apr_bucket_read(ec, &str, &len, APR_BLOCK_READ); |
| foo = apr_bucket_heap_create(str, len, 0, NULL); |
| } |
| APR_BRIGADE_INSERT_TAIL(bsend, foo); |
| ec = APR_BUCKET_NEXT(ec); |
| } while (ec != e2); |
| } |
| |
| if (found == 0) { |
| ap_remove_output_filter(f); |
| r->status = HTTP_OK; |
| return HTTP_RANGE_NOT_SATISFIABLE; |
| } |
| |
| if (ctx->num_ranges > 1) { |
| char *end; |
| |
| /* add the final boundary */ |
| end = apr_pstrcat(r->pool, CRLF "--", r->boundary, "--" CRLF, NULL); |
| ap_xlate_proto_to_ascii(end, strlen(end)); |
| e = apr_bucket_pool_create(end, strlen(end), r->pool); |
| APR_BRIGADE_INSERT_TAIL(bsend, e); |
| } |
| |
| e = apr_bucket_eos_create(); |
| APR_BRIGADE_INSERT_TAIL(bsend, e); |
| |
| /* we're done with the original content */ |
| apr_brigade_destroy(bb); |
| |
| /* send our multipart output */ |
| return ap_pass_brigade(f->next, bsend); |
| } |
| |
| static int ap_set_byterange(request_rec *r) |
| { |
| const char *range; |
| const char *if_range; |
| const char *match; |
| const char *ct; |
| apr_off_t range_start; |
| apr_off_t range_end; |
| int num_ranges; |
| |
| if (r->assbackwards) |
| return 0; |
| |
| /* is content already a single range? */ |
| if (apr_table_get(r->headers_out, "Content-Range")) { |
| return 0; |
| } |
| |
| /* is content already a multiple range? */ |
| if ((ct = apr_table_get(r->headers_out, "Content-Type")) && |
| (!strncasecmp(ct, "multipart/byteranges", 20) || |
| !strncasecmp(ct, "multipart/x-byteranges", 22))) { |
| return 0; |
| } |
| |
| /* Check for Range request-header (HTTP/1.1) or Request-Range for |
| * backwards-compatibility with second-draft Luotonen/Franks |
| * byte-ranges (e.g. Netscape Navigator 2-3). |
| * |
| * We support this form, with Request-Range, and (farther down) we |
| * send multipart/x-byteranges instead of multipart/byteranges for |
| * Request-Range based requests to work around a bug in Netscape |
| * Navigator 2-3 and MSIE 3. |
| */ |
| |
| if (!(range = apr_table_get(r->headers_in, "Range"))) |
| range = apr_table_get(r->headers_in, "Request-Range"); |
| |
| if (!range || strncasecmp(range, "bytes=", 6)) { |
| return 0; |
| } |
| |
| /* Check the If-Range header for Etag or Date. |
| * Note that this check will return false (as required) if either |
| * of the two etags are weak. |
| */ |
| if ((if_range = apr_table_get(r->headers_in, "If-Range"))) { |
| if (if_range[0] == '"') { |
| if (!(match = apr_table_get(r->headers_out, "Etag")) || |
| (strcmp(if_range, match) != 0)) |
| return 0; |
| } |
| else if (!(match = apr_table_get(r->headers_out, "Last-Modified")) || |
| (strcmp(if_range, match) != 0)) |
| return 0; |
| } |
| |
| /* would be nice to pick this up from f->ctx */ |
| ct = ap_make_content_type(r, r->content_type); |
| |
| if (!ap_strchr_c(range, ',')) { |
| int rv; |
| /* A single range */ |
| |
| /* rvarse_byterange() modifies the contents, so make a copy */ |
| if ((rv = parse_byterange(apr_pstrdup(r->pool, range + 6), r->clength, |
| &range_start, &range_end)) <= 0) { |
| return rv; |
| } |
| apr_table_setn(r->headers_out, "Content-Range", |
| apr_psprintf(r->pool, "bytes " BYTERANGE_FMT, |
| range_start, range_end, r->clength)); |
| apr_table_setn(r->headers_out, "Content-Type", ct); |
| |
| num_ranges = 1; |
| } |
| else { |
| /* a multiple range */ |
| |
| num_ranges = 2; |
| |
| /* ### it would be nice if r->boundary was in f->ctx */ |
| r->boundary = apr_psprintf(r->pool, "%qx%lx", |
| r->request_time, (long) getpid()); |
| |
| apr_table_setn(r->headers_out, "Content-Type", |
| apr_pstrcat(r->pool, |
| "multipart", use_range_x(r) ? "/x-" : "/", |
| "byteranges; boundary=", r->boundary, |
| NULL)); |
| } |
| |
| r->status = HTTP_PARTIAL_CONTENT; |
| r->range = range + 6; |
| |
| return num_ranges; |
| } |
| |