/* Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ /* * 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" #include "apr_strmatch.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 "mod_core.h" #include "util_charset.h" #include "util_ebcdic.h" #include "scoreboard.h" #if APR_HAVE_STDARG_H #include #endif #if APR_HAVE_UNISTD_H #include #endif APR_HOOK_STRUCT( APR_HOOK_LINK(post_read_request) APR_HOOK_LINK(log_transaction) APR_HOOK_LINK(http_method) APR_HOOK_LINK(default_port) ) AP_DECLARE_DATA ap_filter_rec_t *ap_old_write_func = NULL; /* Patterns to match in ap_make_content_type() */ static const char *needcset[] = { "text/plain", "text/html", NULL }; static const apr_strmatch_pattern **needcset_patterns; static const apr_strmatch_pattern *charset_pattern; AP_DECLARE(void) ap_setup_make_content_type(apr_pool_t *pool) { int i; for (i = 0; needcset[i]; i++) { continue; } needcset_patterns = (const apr_strmatch_pattern **) apr_palloc(pool, (i + 1) * sizeof(apr_strmatch_pattern *)); for (i = 0; needcset[i]; i++) { needcset_patterns[i] = apr_strmatch_precompile(pool, needcset[i], 0); } needcset_patterns[i] = NULL; charset_pattern = apr_strmatch_precompile(pool, "charset=", 0); } /* * Builds the content-type that should be sent to the client from the * content-type specified. The following rules are followed: * - if type is NULL, type is set to ap_default_type(r) * - if charset adding is disabled, stop processing and return type. * - then, if there are no parameters on type, add the default charset * - return type */ AP_DECLARE(const char *)ap_make_content_type(request_rec *r, const char *type) { const apr_strmatch_pattern **pcset; core_dir_config *conf = (core_dir_config *)ap_get_module_config(r->per_dir_config, &core_module); core_request_config *request_conf; apr_size_t type_len; if (!type) { type = ap_default_type(r); } if (conf->add_default_charset != ADD_DEFAULT_CHARSET_ON) { return type; } request_conf = ap_get_module_config(r->request_config, &core_module); if (request_conf->suppress_charset) { return type; } type_len = strlen(type); if (apr_strmatch(charset_pattern, type, type_len) != NULL) { /* already has parameter, do nothing */ /* XXX we don't check the validity */ ; } else { /* see if it makes sense to add the charset. At present, * we only add it if the Content-type is one of needcset[] */ for (pcset = needcset_patterns; *pcset ; pcset++) { if (apr_strmatch(*pcset, type, type_len) != NULL) { struct iovec concat[3]; concat[0].iov_base = (void *)type; concat[0].iov_len = type_len; concat[1].iov_base = (void *)"; charset="; concat[1].iov_len = sizeof("; charset=") - 1; concat[2].iov_base = (void *)(conf->add_default_charset_name); concat[2].iov_len = strlen(conf->add_default_charset_name); type = apr_pstrcatv(r->pool, concat, 3, NULL); break; } } } return type; } AP_DECLARE(void) ap_set_content_length(request_rec *r, apr_off_t clength) { r->clength = clength; apr_table_setn(r->headers_out, "Content-Length", apr_off_t_toa(r->pool, clength)); } /* * Return the latest rational time from a request/mtime (modification time) * pair. We return the mtime unless it's in the future, in which case we * return the current time. We use the request time as a reference in order * to limit the number of calls to time(). We don't check for futurosity * unless the mtime is at least as new as the reference. */ AP_DECLARE(apr_time_t) ap_rationalize_mtime(request_rec *r, apr_time_t mtime) { apr_time_t now; /* For all static responses, it's almost certain that the file was * last modified before the beginning of the request. So there's * no reason to call time(NULL) again. But if the response has been * created on demand, then it might be newer than the time the request * started. In this event we really have to call time(NULL) again * so that we can give the clients the most accurate Last-Modified. If we * were given a time in the future, we return the current time - the * Last-Modified can't be in the future. */ now = (mtime < r->request_time) ? r->request_time : apr_time_now(); return (mtime > now) ? now : mtime; } /* Min # of bytes to allocate when reading a request line */ #define MIN_LINE_ALLOC 80 /* Get a line of protocol input, including any continuation lines * caused by MIME folding (or broken clients) if fold != 0, and place it * in the buffer s, of size n bytes, without the ending newline. * * If s is NULL, ap_rgetline_core will allocate necessary memory from r->pool. * * Returns APR_SUCCESS if there are no problems and sets *read to be * the full length of s. * * APR_ENOSPC is returned if there is not enough buffer space. * Other errors may be returned on other errors. * * The LF is *not* returned in the buffer. Therefore, a *read of 0 * indicates that an empty line was read. * * Notes: Because the buffer uses 1 char for NUL, the most we can return is * (n - 1) actual characters. * * If no LF is detected on the last line due to a dropped connection * or a full buffer, that's considered an error. */ AP_DECLARE(apr_status_t) ap_rgetline_core(char **s, apr_size_t n, apr_size_t *read, request_rec *r, int fold, apr_bucket_brigade *bb) { apr_status_t rv; apr_bucket *e; apr_size_t bytes_handled = 0, current_alloc = 0; char *pos, *last_char = *s; int do_alloc = (*s == NULL), saw_eos = 0; /* * Initialize last_char as otherwise a random value will be compared * against APR_ASCII_LF at the end of the loop if bb only contains * zero-length buckets. */ if (last_char) *last_char = '\0'; for (;;) { apr_brigade_cleanup(bb); rv = ap_get_brigade(r->input_filters, bb, AP_MODE_GETLINE, APR_BLOCK_READ, 0); if (rv != APR_SUCCESS) { return rv; } /* Something horribly wrong happened. Someone didn't block! */ if (APR_BRIGADE_EMPTY(bb)) { return APR_EGENERAL; } APR_BRIGADE_FOREACH(e, bb) { const char *str; apr_size_t len; /* If we see an EOS, don't bother doing anything more. */ if (APR_BUCKET_IS_EOS(e)) { saw_eos = 1; break; } rv = apr_bucket_read(e, &str, &len, APR_BLOCK_READ); if (rv != APR_SUCCESS) { return rv; } if (len == 0) { /* no use attempting a zero-byte alloc (hurts when * using --with-efence --enable-pool-debug) or * doing any of the other logic either */ continue; } /* Would this overrun our buffer? If so, we'll die. */ if (n < bytes_handled + len) { *read = bytes_handled; if (*s) { /* ensure this string is NUL terminated */ if (bytes_handled > 0) { (*s)[bytes_handled-1] = '\0'; } else { (*s)[0] = '\0'; } } return APR_ENOSPC; } /* Do we have to handle the allocation ourselves? */ if (do_alloc) { /* We'll assume the common case where one bucket is enough. */ if (!*s) { current_alloc = len; if (current_alloc < MIN_LINE_ALLOC) { current_alloc = MIN_LINE_ALLOC; } *s = apr_palloc(r->pool, current_alloc); } else if (bytes_handled + len > current_alloc) { /* Increase the buffer size */ apr_size_t new_size = current_alloc * 2; char *new_buffer; if (bytes_handled + len > new_size) { new_size = (bytes_handled + len) * 2; } new_buffer = apr_palloc(r->pool, new_size); /* Copy what we already had. */ memcpy(new_buffer, *s, bytes_handled); current_alloc = new_size; *s = new_buffer; } } /* Just copy the rest of the data to the end of the old buffer. */ pos = *s + bytes_handled; memcpy(pos, str, len); last_char = pos + len - 1; /* We've now processed that new data - update accordingly. */ bytes_handled += len; } /* If we got a full line of input, stop reading */ if (last_char && (*last_char == APR_ASCII_LF)) { break; } } /* Now NUL-terminate the string at the end of the line; * if the last-but-one character is a CR, terminate there */ if (last_char > *s && last_char[-1] == APR_ASCII_CR) { last_char--; } *last_char = '\0'; bytes_handled = last_char - *s; /* If we're folding, we have more work to do. * * Note that if an EOS was seen, we know we can't have another line. */ if (fold && bytes_handled && !saw_eos) { for (;;) { const char *str; apr_size_t len; char c; /* Clear the temp brigade for this filter read. */ apr_brigade_cleanup(bb); /* We only care about the first byte. */ rv = ap_get_brigade(r->input_filters, bb, AP_MODE_SPECULATIVE, APR_BLOCK_READ, 1); if (rv != APR_SUCCESS) { return rv; } if (APR_BRIGADE_EMPTY(bb)) { break; } e = APR_BRIGADE_FIRST(bb); /* If we see an EOS, don't bother doing anything more. */ if (APR_BUCKET_IS_EOS(e)) { break; } rv = apr_bucket_read(e, &str, &len, APR_BLOCK_READ); if (rv != APR_SUCCESS) { apr_brigade_cleanup(bb); return rv; } /* Found one, so call ourselves again to get the next line. * * FIXME: If the folding line is completely blank, should we * stop folding? Does that require also looking at the next * char? */ /* When we call destroy, the buckets are deleted, so save that * one character we need. This simplifies our execution paths * at the cost of one character read. */ c = *str; if (c == APR_ASCII_BLANK || c == APR_ASCII_TAB) { /* Do we have enough space? We may be full now. */ if (bytes_handled >= n) { *read = n; /* ensure this string is terminated */ (*s)[n-1] = '\0'; return APR_ENOSPC; } else { apr_size_t next_size, next_len; char *tmp; /* If we're doing the allocations for them, we have to * give ourselves a NULL and copy it on return. */ if (do_alloc) { tmp = NULL; } else { /* We're null terminated. */ tmp = last_char; } next_size = n - bytes_handled; rv = ap_rgetline_core(&tmp, next_size, &next_len, r, 0, bb); if (rv != APR_SUCCESS) { return rv; } if (do_alloc && next_len > 0) { char *new_buffer; apr_size_t new_size = bytes_handled + next_len + 1; /* we need to alloc an extra byte for a null */ new_buffer = apr_palloc(r->pool, new_size); /* Copy what we already had. */ memcpy(new_buffer, *s, bytes_handled); /* copy the new line, including the trailing null */ memcpy(new_buffer + bytes_handled, tmp, next_len + 1); *s = new_buffer; } bytes_handled += next_len; } } else { /* next character is not tab or space */ break; } } } *read = bytes_handled; return APR_SUCCESS; } #if APR_CHARSET_EBCDIC AP_DECLARE(apr_status_t) ap_rgetline(char **s, apr_size_t n, apr_size_t *read, request_rec *r, int fold, apr_bucket_brigade *bb) { /* on ASCII boxes, ap_rgetline is a macro which simply invokes * ap_rgetline_core with the same parms * * on EBCDIC boxes, each complete http protocol input line needs to be * translated into the code page used by the compiler. Since * ap_rgetline_core uses recursion, we do the translation in a wrapper * function to insure that each input character gets translated only once. */ apr_status_t rv; rv = ap_rgetline_core(s, n, read, r, fold, bb); if (rv == APR_SUCCESS) { ap_xlate_proto_from_ascii(*s, *read); } return rv; } #endif AP_DECLARE(int) ap_getline(char *s, int n, request_rec *r, int fold) { char *tmp_s = s; apr_status_t rv; apr_size_t len; apr_bucket_brigade *tmp_bb; tmp_bb = apr_brigade_create(r->pool, r->connection->bucket_alloc); rv = ap_rgetline(&tmp_s, n, &len, r, fold, tmp_bb); apr_brigade_destroy(tmp_bb); /* Map the out-of-space condition to the old API. */ if (rv == APR_ENOSPC) { return n; } /* Anything else is just bad. */ if (rv != APR_SUCCESS) { return -1; } return (int)len; } /* parse_uri: break apart the uri * Side Effects: * - sets r->args to rest after '?' (or NULL if no '?') * - sets r->uri to request uri (without r->args part) * - sets r->hostname (if not set already) from request (scheme://host:port) */ AP_CORE_DECLARE(void) ap_parse_uri(request_rec *r, const char *uri) { int status = HTTP_OK; r->unparsed_uri = apr_pstrdup(r->pool, uri); if (r->method_number == M_CONNECT) { status = apr_uri_parse_hostinfo(r->pool, uri, &r->parsed_uri); } else { /* Simple syntax Errors in URLs are trapped by * parse_uri_components(). */ status = apr_uri_parse(r->pool, uri, &r->parsed_uri); } if (status == APR_SUCCESS) { /* if it has a scheme we may need to do absoluteURI vhost stuff */ if (r->parsed_uri.scheme && !strcasecmp(r->parsed_uri.scheme, ap_http_method(r))) { r->hostname = r->parsed_uri.hostname; } else if (r->method_number == M_CONNECT) { r->hostname = r->parsed_uri.hostname; } r->args = r->parsed_uri.query; r->uri = r->parsed_uri.path ? r->parsed_uri.path : apr_pstrdup(r->pool, "/"); #if defined(OS2) || defined(WIN32) /* Handle path translations for OS/2 and plug security hole. * This will prevent "http://www.wherever.com/..\..\/" from * returning a directory for the root drive. */ { char *x; for (x = r->uri; (x = strchr(x, '\\')) != NULL; ) *x = '/'; } #endif /* OS2 || WIN32 */ } else { r->args = NULL; r->hostname = NULL; r->status = HTTP_BAD_REQUEST; /* set error status */ r->uri = apr_pstrdup(r->pool, uri); } } static int read_request_line(request_rec *r, apr_bucket_brigade *bb) { const char *ll; const char *uri; const char *pro; #if 0 conn_rec *conn = r->connection; #endif int major = 1, minor = 0; /* Assume HTTP/1.0 if non-"HTTP" protocol */ char http[5]; apr_size_t len; int num_blank_lines = 0; int max_blank_lines = r->server->limit_req_fields; if (max_blank_lines <= 0) { max_blank_lines = DEFAULT_LIMIT_REQUEST_FIELDS; } /* Read past empty lines until we get a real request line, * a read error, the connection closes (EOF), or we timeout. * * We skip empty lines because browsers have to tack a CRLF on to the end * of POSTs to support old CERN webservers. But note that we may not * have flushed any previous response completely to the client yet. * We delay the flush as long as possible so that we can improve * performance for clients that are pipelining requests. If a request * is pipelined then we won't block during the (implicit) read() below. * If the requests aren't pipelined, then the client is still waiting * for the final buffer flush from us, and we will block in the implicit * read(). B_SAFEREAD ensures that the BUFF layer flushes if it will * have to block during a read. */ do { apr_status_t rv; /* insure ap_rgetline allocates memory each time thru the loop * if there are empty lines */ r->the_request = NULL; rv = ap_rgetline(&(r->the_request), (apr_size_t)(r->server->limit_req_line + 2), &len, r, 0, bb); if (rv != APR_SUCCESS) { r->request_time = apr_time_now(); /* ap_rgetline returns APR_ENOSPC if it fills up the * buffer before finding the end-of-line. This is only going to * happen if it exceeds the configured limit for a request-line. */ if (rv == APR_ENOSPC) { r->status = HTTP_REQUEST_URI_TOO_LARGE; r->proto_num = HTTP_VERSION(1,0); r->protocol = apr_pstrdup(r->pool, "HTTP/1.0"); } return 0; } } while ((len <= 0) && (++num_blank_lines < max_blank_lines)); /* we've probably got something to do, ignore graceful restart requests */ r->request_time = apr_time_now(); ll = r->the_request; r->method = ap_getword_white(r->pool, &ll); #if 0 /* XXX If we want to keep track of the Method, the protocol module should do * it. That support isn't in the scoreboard yet. Hopefully next week * sometime. rbb */ ap_update_connection_status(AP_CHILD_THREAD_FROM_ID(conn->id), "Method", r->method); #endif uri = ap_getword_white(r->pool, &ll); /* Provide quick information about the request method as soon as known */ r->method_number = ap_method_number_of(r->method); if (r->method_number == M_GET && r->method[0] == 'H') { r->header_only = 1; } ap_parse_uri(r, uri); if (ll[0]) { r->assbackwards = 0; pro = ll; len = strlen(ll); } else { r->assbackwards = 1; pro = "HTTP/0.9"; len = 8; } r->protocol = apr_pstrmemdup(r->pool, pro, len); /* XXX ap_update_connection_status(conn->id, "Protocol", r->protocol); */ /* Avoid sscanf in the common case */ if (len == 8 && pro[0] == 'H' && pro[1] == 'T' && pro[2] == 'T' && pro[3] == 'P' && pro[4] == '/' && apr_isdigit(pro[5]) && pro[6] == '.' && apr_isdigit(pro[7])) { r->proto_num = HTTP_VERSION(pro[5] - '0', pro[7] - '0'); } else if (3 == sscanf(r->protocol, "%4s/%u.%u", http, &major, &minor) && (strcasecmp("http", http) == 0) && (minor < HTTP_VERSION(1, 0)) ) /* don't allow HTTP/0.1000 */ r->proto_num = HTTP_VERSION(major, minor); else r->proto_num = HTTP_VERSION(1, 0); return 1; } AP_DECLARE(void) ap_get_mime_headers_core(request_rec *r, apr_bucket_brigade *bb) { char *last_field = NULL; apr_size_t last_len = 0; apr_size_t alloc_len = 0; char *field; char *value; apr_size_t len; int fields_read = 0; char *tmp_field; /* * Read header lines until we get the empty separator line, a read error, * the connection closes (EOF), reach the server limit, or we timeout. */ while(1) { apr_status_t rv; int folded = 0; field = NULL; rv = ap_rgetline(&field, r->server->limit_req_fieldsize + 2, &len, r, 0, bb); /* ap_rgetline returns APR_ENOSPC if it fills up the buffer before * finding the end-of-line. This is only going to happen if it * exceeds the configured limit for a field size. */ if (rv == APR_ENOSPC && field) { r->status = HTTP_BAD_REQUEST; /* insure ap_escape_html will terminate correctly */ field[len - 1] = '\0'; apr_table_setn(r->notes, "error-notes", apr_pstrcat(r->pool, "Size of a request header field " "exceeds server limit.
\n" "
\n",
                                       ap_escape_html(r->pool, field),
                                       "
\n", NULL)); return; } if (rv != APR_SUCCESS) { r->status = HTTP_BAD_REQUEST; return; } if (last_field != NULL) { if ((len > 0) && ((*field == '\t') || *field == ' ')) { /* This line is a continuation of the preceding line(s), * so append it to the line that we've set aside. * Note: this uses a power-of-two allocator to avoid * doing O(n) allocs and using O(n^2) space for * continuations that span many many lines. */ apr_size_t fold_len = last_len + len + 1; /* trailing null */ if ((fold_len - 1) > r->server->limit_req_fieldsize) { r->status = HTTP_BAD_REQUEST; /* report what we have accumulated so far before the * overflow (last_field) as the field with the problem */ apr_table_setn(r->notes, "error-notes", apr_pstrcat(r->pool, "Size of a request header field " "after folding " "exceeds server limit.
\n" "
\n",
                                               ap_escape_html(r->pool, last_field),
                                               "
\n", NULL)); return; } if (fold_len > alloc_len) { char *fold_buf; alloc_len += alloc_len; if (fold_len > alloc_len) { alloc_len = fold_len; } fold_buf = (char *)apr_palloc(r->pool, alloc_len); memcpy(fold_buf, last_field, last_len); last_field = fold_buf; } memcpy(last_field + last_len, field, len +1); /* +1 for nul */ last_len += len; folded = 1; } else /* not a continuation line */ { if (r->server->limit_req_fields && (++fields_read > r->server->limit_req_fields)) { r->status = HTTP_BAD_REQUEST; apr_table_setn(r->notes, "error-notes", "The number of request header fields " "exceeds this server's limit."); return; } if (!(value = strchr(last_field, ':'))) { /* Find ':' or */ r->status = HTTP_BAD_REQUEST; /* abort bad request */ apr_table_setn(r->notes, "error-notes", apr_pstrcat(r->pool, "Request header field is " "missing ':' separator.
\n" "
\n",
                                               ap_escape_html(r->pool,
                                                              last_field),
                                               "
\n", NULL)); return; } tmp_field = value - 1; /* last character of field-name */ *value++ = '\0'; /* NUL-terminate at colon */ while (*value == ' ' || *value == '\t') { ++value; /* Skip to start of value */ } /* Strip LWS after field-name: */ while (tmp_field > last_field && (*tmp_field == ' ' || *tmp_field == '\t')) { *tmp_field-- = '\0'; } /* Strip LWS after field-value: */ tmp_field = last_field + last_len - 1; while (tmp_field > value && (*tmp_field == ' ' || *tmp_field == '\t')) { *tmp_field-- = '\0'; } apr_table_addn(r->headers_in, last_field, value); /* reset the alloc_len so that we'll allocate a new * buffer if we have to do any more folding: we can't * use the previous buffer because its contents are * now part of r->headers_in */ alloc_len = 0; } /* end if current line is not a continuation starting with tab */ } /* Found a blank line, stop. */ if (len == 0) { break; } /* Keep track of this line so that we can parse it on * the next loop iteration. (In the folded case, last_field * has been updated already.) */ if (!folded) { last_field = field; last_len = len; } } apr_table_compress(r->headers_in, APR_OVERLAP_TABLES_MERGE); } AP_DECLARE(void) ap_get_mime_headers(request_rec *r) { apr_bucket_brigade *tmp_bb; tmp_bb = apr_brigade_create(r->pool, r->connection->bucket_alloc); ap_get_mime_headers_core(r, tmp_bb); apr_brigade_destroy(tmp_bb); } request_rec *ap_read_request(conn_rec *conn) { request_rec *r; apr_pool_t *p; const char *expect; int access_status; apr_bucket_brigade *tmp_bb; apr_pool_create(&p, conn->pool); apr_pool_tag(p, "request"); r = apr_pcalloc(p, sizeof(request_rec)); r->pool = p; r->connection = conn; r->server = conn->base_server; r->user = NULL; r->ap_auth_type = NULL; r->allowed_methods = ap_make_method_list(p, 2); r->headers_in = apr_table_make(r->pool, 25); r->subprocess_env = apr_table_make(r->pool, 25); r->headers_out = apr_table_make(r->pool, 12); r->err_headers_out = apr_table_make(r->pool, 5); r->notes = apr_table_make(r->pool, 5); r->request_config = ap_create_request_config(r->pool); /* Must be set before we run create request hook */ r->proto_output_filters = conn->output_filters; r->output_filters = r->proto_output_filters; r->proto_input_filters = conn->input_filters; r->input_filters = r->proto_input_filters; ap_run_create_request(r); r->per_dir_config = r->server->lookup_defaults; r->sent_bodyct = 0; /* bytect isn't for body */ r->read_length = 0; r->read_body = REQUEST_NO_BODY; r->status = HTTP_REQUEST_TIME_OUT; /* Until we get a request */ r->the_request = NULL; tmp_bb = apr_brigade_create(r->pool, r->connection->bucket_alloc); /* Get the request... */ if (!read_request_line(r, tmp_bb)) { if (r->status == HTTP_REQUEST_URI_TOO_LARGE) { ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "request failed: URI too long (longer than %d)", r->server->limit_req_line); ap_send_error_response(r, 0); ap_update_child_status(conn->sbh, SERVER_BUSY_LOG, r); ap_run_log_transaction(r); apr_brigade_destroy(tmp_bb); return r; } apr_brigade_destroy(tmp_bb); return NULL; } if (!r->assbackwards) { ap_get_mime_headers_core(r, tmp_bb); if (r->status != HTTP_REQUEST_TIME_OUT) { ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "request failed: error reading the headers"); ap_send_error_response(r, 0); ap_update_child_status(conn->sbh, SERVER_BUSY_LOG, r); ap_run_log_transaction(r); apr_brigade_destroy(tmp_bb); return r; } if (apr_table_get(r->headers_in, "Transfer-Encoding") && apr_table_get(r->headers_in, "Content-Length")) { /* 2616 section 4.4, point 3: "if both Transfer-Encoding * and Content-Length are received, the latter MUST be * ignored"; so unset it here to prevent any confusion * later. */ apr_table_unset(r->headers_in, "Content-Length"); } } else { if (r->header_only) { /* * Client asked for headers only with HTTP/0.9, which doesn't send * headers! Have to dink things just to make sure the error message * comes through... */ ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "client sent invalid HTTP/0.9 request: HEAD %s", r->uri); r->header_only = 0; r->status = HTTP_BAD_REQUEST; ap_send_error_response(r, 0); ap_update_child_status(conn->sbh, SERVER_BUSY_LOG, r); ap_run_log_transaction(r); apr_brigade_destroy(tmp_bb); return r; } } apr_brigade_destroy(tmp_bb); r->status = HTTP_OK; /* Until further notice. */ /* update what we think the virtual host is based on the headers we've * now read. may update status. */ ap_update_vhost_from_headers(r); /* we may have switched to another server */ r->per_dir_config = r->server->lookup_defaults; if ((!r->hostname && (r->proto_num >= HTTP_VERSION(1, 1))) || ((r->proto_num == HTTP_VERSION(1, 1)) && !apr_table_get(r->headers_in, "Host"))) { /* * Client sent us an HTTP/1.1 or later request without telling us the * hostname, either with a full URL or a Host: header. We therefore * need to (as per the 1.1 spec) send an error. As a special case, * HTTP/1.1 mentions twice (S9, S14.23) that a request MUST contain * a Host: header, and the server MUST respond with 400 if it doesn't. */ r->status = HTTP_BAD_REQUEST; ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "client sent HTTP/1.1 request without hostname " "(see RFC2616 section 14.23): %s", r->uri); } if (r->status != HTTP_OK) { ap_send_error_response(r, 0); ap_update_child_status(conn->sbh, SERVER_BUSY_LOG, r); ap_run_log_transaction(r); return r; } if (((expect = apr_table_get(r->headers_in, "Expect")) != NULL) && (expect[0] != '\0')) { /* * The Expect header field was added to HTTP/1.1 after RFC 2068 * as a means to signal when a 100 response is desired and, * unfortunately, to signal a poor man's mandatory extension that * the server must understand or return 417 Expectation Failed. */ if (strcasecmp(expect, "100-continue") == 0) { r->expecting_100 = 1; } else { r->status = HTTP_EXPECTATION_FAILED; ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, "client sent an unrecognized expectation value of " "Expect: %s", expect); ap_send_error_response(r, 0); ap_update_child_status(conn->sbh, SERVER_BUSY_LOG, r); ap_run_log_transaction(r); return r; } } ap_add_input_filter_handle(ap_http_input_filter_handle, NULL, r, r->connection); if ((access_status = ap_run_post_read_request(r))) { ap_die(access_status, r); ap_update_child_status(conn->sbh, SERVER_BUSY_LOG, r); ap_run_log_transaction(r); return NULL; } return r; } /* * A couple of other functions which initialize some of the fields of * a request structure, as appropriate for adjuncts of one kind or another * to a request in progress. Best here, rather than elsewhere, since * *someone* has to set the protocol-specific fields... */ AP_DECLARE(void) ap_set_sub_req_protocol(request_rec *rnew, const request_rec *r) { rnew->the_request = r->the_request; /* Keep original request-line */ rnew->assbackwards = 1; /* Don't send headers from this. */ rnew->no_local_copy = 1; /* Don't try to send HTTP_NOT_MODIFIED for a * fragment. */ rnew->method = "GET"; rnew->method_number = M_GET; rnew->protocol = "INCLUDED"; rnew->status = HTTP_OK; rnew->headers_in = apr_table_copy(rnew->pool, r->headers_in); rnew->subprocess_env = apr_table_copy(rnew->pool, r->subprocess_env); rnew->headers_out = apr_table_make(rnew->pool, 5); rnew->err_headers_out = apr_table_make(rnew->pool, 5); rnew->notes = apr_table_make(rnew->pool, 5); rnew->expecting_100 = r->expecting_100; rnew->read_length = r->read_length; rnew->read_body = REQUEST_NO_BODY; rnew->main = (request_rec *) r; } static void end_output_stream(request_rec *r) { conn_rec *c = r->connection; apr_bucket_brigade *bb; apr_bucket *b; bb = apr_brigade_create(r->pool, c->bucket_alloc); b = apr_bucket_eos_create(c->bucket_alloc); APR_BRIGADE_INSERT_TAIL(bb, b); ap_pass_brigade(r->output_filters, bb); } AP_DECLARE(void) ap_finalize_sub_req_protocol(request_rec *sub) { /* tell the filter chain there is no more content coming */ if (!sub->eos_sent) { end_output_stream(sub); } } /* finalize_request_protocol is called at completion of sending the * response. Its sole purpose is to send the terminating protocol * information for any wrappers around the response message body * (i.e., transfer encodings). It should have been named finalize_response. */ AP_DECLARE(void) ap_finalize_request_protocol(request_rec *r) { (void) ap_discard_request_body(r); /* tell the filter chain there is no more content coming */ if (!r->eos_sent) { end_output_stream(r); } } /* * Support for the Basic authentication protocol, and a bit for Digest. */ AP_DECLARE(void) ap_note_auth_failure(request_rec *r) { const char *type = ap_auth_type(r); if (type) { if (!strcasecmp(type, "Basic")) ap_note_basic_auth_failure(r); else if (!strcasecmp(type, "Digest")) ap_note_digest_auth_failure(r); } else { ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "need AuthType to note auth failure: %s", r->uri); } } AP_DECLARE(void) ap_note_basic_auth_failure(request_rec *r) { const char *type = ap_auth_type(r); /* if there is no AuthType configure or it is something other than * Basic, let ap_note_auth_failure() deal with it */ if (!type || strcasecmp(type, "Basic")) ap_note_auth_failure(r); else apr_table_setn(r->err_headers_out, (PROXYREQ_PROXY == r->proxyreq) ? "Proxy-Authenticate" : "WWW-Authenticate", apr_pstrcat(r->pool, "Basic realm=\"", ap_auth_name(r), "\"", NULL)); } AP_DECLARE(void) ap_note_digest_auth_failure(request_rec *r) { apr_table_setn(r->err_headers_out, (PROXYREQ_PROXY == r->proxyreq) ? "Proxy-Authenticate" : "WWW-Authenticate", /* need APR_TIME_T_FMT_HEX */ apr_psprintf(r->pool, "Digest realm=\"%s\", nonce=\"%llx\"", ap_auth_name(r), r->request_time)); } AP_DECLARE(int) ap_get_basic_auth_pw(request_rec *r, const char **pw) { const char *auth_line = apr_table_get(r->headers_in, (PROXYREQ_PROXY == r->proxyreq) ? "Proxy-Authorization" : "Authorization"); const char *t; if (!(t = ap_auth_type(r)) || strcasecmp(t, "Basic")) return DECLINED; if (!ap_auth_name(r)) { ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "need AuthName: %s", r->uri); return HTTP_INTERNAL_SERVER_ERROR; } if (!auth_line) { ap_note_basic_auth_failure(r); return HTTP_UNAUTHORIZED; } if (strcasecmp(ap_getword(r->pool, &auth_line, ' '), "Basic")) { /* Client tried to authenticate using wrong auth scheme */ ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "client used wrong authentication scheme: %s", r->uri); ap_note_basic_auth_failure(r); return HTTP_UNAUTHORIZED; } while (*auth_line == ' ' || *auth_line == '\t') { auth_line++; } t = ap_pbase64decode(r->pool, auth_line); r->user = ap_getword_nulls (r->pool, &t, ':'); r->ap_auth_type = "Basic"; *pw = t; return OK; } struct content_length_ctx { int data_sent; /* true if the C-L filter has already sent at * least one bucket on to the next output filter * for this request */ }; /* This filter computes the content length, but it also computes the number * of bytes sent to the client. This means that this filter will always run * through all of the buckets in all brigades */ AP_CORE_DECLARE_NONSTD(apr_status_t) ap_content_length_filter( ap_filter_t *f, apr_bucket_brigade *b) { request_rec *r = f->r; struct content_length_ctx *ctx; apr_bucket *e; int eos = 0; apr_read_type_e eblock = APR_NONBLOCK_READ; ctx = f->ctx; if (!ctx) { f->ctx = ctx = apr_palloc(r->pool, sizeof(*ctx)); ctx->data_sent = 0; } /* Loop through this set of buckets to compute their length */ e = APR_BRIGADE_FIRST(b); while (e != APR_BRIGADE_SENTINEL(b)) { if (APR_BUCKET_IS_EOS(e)) { eos = 1; break; } if (e->length == (apr_size_t)-1) { apr_size_t len; const char *ignored; apr_status_t rv; /* This is probably a pipe bucket. Send everything * prior to this, and then read the data for this bucket. */ rv = apr_bucket_read(e, &ignored, &len, eblock); if (rv == APR_SUCCESS) { /* Attempt a nonblocking read next time through */ eblock = APR_NONBLOCK_READ; r->bytes_sent += len; } else if (APR_STATUS_IS_EAGAIN(rv)) { /* Output everything prior to this bucket, and then * do a blocking read on the next batch. */ if (e != APR_BRIGADE_FIRST(b)) { apr_bucket_brigade *split = apr_brigade_split(b, e); apr_bucket *flush = apr_bucket_flush_create(r->connection->bucket_alloc); APR_BRIGADE_INSERT_TAIL(b, flush); rv = ap_pass_brigade(f->next, b); if (rv != APR_SUCCESS || f->c->aborted) { apr_brigade_destroy(split); return rv; } b = split; e = APR_BRIGADE_FIRST(b); ctx->data_sent = 1; } eblock = APR_BLOCK_READ; continue; } else { ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, "ap_content_length_filter: " "apr_bucket_read() failed"); return rv; } } else { r->bytes_sent += e->length; } e = APR_BUCKET_NEXT(e); } /* If we've now seen the entire response and it's otherwise * okay to set the C-L in the response header, then do so now. * * We can only set a C-L in the response header if we haven't already * sent any buckets on to the next output filter for this request. */ if (ctx->data_sent == 0 && eos && /* don't whack the C-L if it has already been set for a HEAD * by something like proxy. the brigade only has an EOS bucket * in this case, making r->bytes_sent zero. * * if r->bytes_sent > 0 we have a (temporary) body whose length may * have been changed by a filter. the C-L header might not have been * updated so we do it here. long term it would be cleaner to have * such filters update or remove the C-L header, and just use it * if present. */ !(r->header_only && r->bytes_sent == 0 && apr_table_get(r->headers_out, "Content-Length"))) { ap_set_content_length(r, r->bytes_sent); } ctx->data_sent = 1; return ap_pass_brigade(f->next, b); } /* * Send the body of a response to the client. */ AP_DECLARE(apr_status_t) ap_send_fd(apr_file_t *fd, request_rec *r, apr_off_t offset, apr_size_t len, apr_size_t *nbytes) { conn_rec *c = r->connection; apr_bucket_brigade *bb = NULL; apr_bucket *b; apr_status_t rv; bb = apr_brigade_create(r->pool, c->bucket_alloc); b = apr_bucket_file_create(fd, offset, len, r->pool, c->bucket_alloc); APR_BRIGADE_INSERT_TAIL(bb, b); rv = ap_pass_brigade(r->output_filters, bb); if (rv != APR_SUCCESS) { *nbytes = 0; /* no way to tell how many were actually sent */ } else { *nbytes = len; } return rv; } #if APR_HAS_MMAP /* send data from an in-memory buffer */ AP_DECLARE(size_t) ap_send_mmap(apr_mmap_t *mm, request_rec *r, size_t offset, size_t length) { conn_rec *c = r->connection; apr_bucket_brigade *bb = NULL; apr_bucket *b; bb = apr_brigade_create(r->pool, c->bucket_alloc); b = apr_bucket_mmap_create(mm, offset, length, c->bucket_alloc); APR_BRIGADE_INSERT_TAIL(bb, b); ap_pass_brigade(r->output_filters, bb); return mm->size; /* XXX - change API to report apr_status_t? */ } #endif /* APR_HAS_MMAP */ typedef struct { apr_bucket_brigade *bb; } old_write_filter_ctx; AP_CORE_DECLARE_NONSTD(apr_status_t) ap_old_write_filter( ap_filter_t *f, apr_bucket_brigade *bb) { old_write_filter_ctx *ctx = f->ctx; AP_DEBUG_ASSERT(ctx); if (ctx->bb != 0) { /* whatever is coming down the pipe (we don't care), we * can simply insert our buffered data at the front and * pass the whole bundle down the chain. */ APR_BRIGADE_CONCAT(ctx->bb, bb); bb = ctx->bb; ctx->bb = NULL; } return ap_pass_brigade(f->next, bb); } static apr_status_t buffer_output(request_rec *r, const char *str, apr_size_t len) { conn_rec *c = r->connection; ap_filter_t *f; old_write_filter_ctx *ctx; if (len == 0) return APR_SUCCESS; /* future optimization: record some flags in the request_rec to * say whether we've added our filter, and whether it is first. */ /* this will typically exit on the first test */ for (f = r->output_filters; f != NULL; f = f->next) { if (ap_old_write_func == f->frec) break; } if (f == NULL) { /* our filter hasn't been added yet */ ctx = apr_pcalloc(r->pool, sizeof(*ctx)); ap_add_output_filter("OLD_WRITE", ctx, r, r->connection); f = r->output_filters; } /* if the first filter is not our buffering filter, then we have to * deliver the content through the normal filter chain */ if (f != r->output_filters) { apr_bucket_brigade *bb = apr_brigade_create(r->pool, c->bucket_alloc); apr_bucket *b = apr_bucket_transient_create(str, len, c->bucket_alloc); APR_BRIGADE_INSERT_TAIL(bb, b); return ap_pass_brigade(r->output_filters, bb); } /* grab the context from our filter */ ctx = r->output_filters->ctx; if (ctx->bb == NULL) { ctx->bb = apr_brigade_create(r->pool, c->bucket_alloc); } return ap_fwrite(f->next, ctx->bb, str, len); } AP_DECLARE(int) ap_rputc(int c, request_rec *r) { char c2 = (char)c; if (r->connection->aborted) { return -1; } if (buffer_output(r, &c2, 1) != APR_SUCCESS) return -1; return c; } AP_DECLARE(int) ap_rputs(const char *str, request_rec *r) { apr_size_t len; if (r->connection->aborted) return -1; if (buffer_output(r, str, len = strlen(str)) != APR_SUCCESS) return -1; return len; } AP_DECLARE(int) ap_rwrite(const void *buf, int nbyte, request_rec *r) { if (r->connection->aborted) return -1; if (buffer_output(r, buf, nbyte) != APR_SUCCESS) return -1; return nbyte; } struct ap_vrprintf_data { apr_vformatter_buff_t vbuff; request_rec *r; char *buff; }; static apr_status_t r_flush(apr_vformatter_buff_t *buff) { /* callback function passed to ap_vformatter to be called when * vformatter needs to write into buff and buff.curpos > buff.endpos */ /* ap_vrprintf_data passed as a apr_vformatter_buff_t, which is then * "downcast" to an ap_vrprintf_data */ struct ap_vrprintf_data *vd = (struct ap_vrprintf_data*)buff; if (vd->r->connection->aborted) return -1; /* r_flush is called when vbuff is completely full */ if (buffer_output(vd->r, vd->buff, AP_IOBUFSIZE)) { return -1; } /* reset the buffer position */ vd->vbuff.curpos = vd->buff; vd->vbuff.endpos = vd->buff + AP_IOBUFSIZE; return APR_SUCCESS; } AP_DECLARE(int) ap_vrprintf(request_rec *r, const char *fmt, va_list va) { apr_size_t written; struct ap_vrprintf_data vd; char vrprintf_buf[AP_IOBUFSIZE]; vd.vbuff.curpos = vrprintf_buf; vd.vbuff.endpos = vrprintf_buf + AP_IOBUFSIZE; vd.r = r; vd.buff = vrprintf_buf; if (r->connection->aborted) return -1; written = apr_vformatter(r_flush, &vd.vbuff, fmt, va); /* tack on null terminator on remaining string */ *(vd.vbuff.curpos) = '\0'; if (written != -1) { int n = vd.vbuff.curpos - vrprintf_buf; /* last call to buffer_output, to finish clearing the buffer */ if (buffer_output(r, vrprintf_buf,n) != APR_SUCCESS) return -1; written += n; } return written; } AP_DECLARE_NONSTD(int) ap_rprintf(request_rec *r, const char *fmt, ...) { va_list va; int n; if (r->connection->aborted) return -1; va_start(va, fmt); n = ap_vrprintf(r, fmt, va); va_end(va); return n; } AP_DECLARE_NONSTD(int) ap_rvputs(request_rec *r, ...) { va_list va; const char *s; apr_size_t len; apr_size_t written = 0; if (r->connection->aborted) return -1; /* ### TODO: if the total output is large, put all the strings * ### into a single brigade, rather than flushing each time we * ### fill the buffer */ va_start(va, r); while (1) { s = va_arg(va, const char *); if (s == NULL) break; len = strlen(s); if (buffer_output(r, s, len) != APR_SUCCESS) { return -1; } written += len; } va_end(va); return written; } AP_DECLARE(int) ap_rflush(request_rec *r) { conn_rec *c = r->connection; apr_bucket_brigade *bb; apr_bucket *b; bb = apr_brigade_create(r->pool, c->bucket_alloc); b = apr_bucket_flush_create(c->bucket_alloc); APR_BRIGADE_INSERT_TAIL(bb, b); if (ap_pass_brigade(r->output_filters, bb) != APR_SUCCESS) return -1; return 0; } /* * This function sets the Last-Modified output header field to the value * of the mtime field in the request structure - rationalized to keep it from * being in the future. */ AP_DECLARE(void) ap_set_last_modified(request_rec *r) { if (!r->assbackwards) { apr_time_t mod_time = ap_rationalize_mtime(r, r->mtime); char *datestr = apr_palloc(r->pool, APR_RFC822_DATE_LEN); apr_rfc822_date(datestr, mod_time); apr_table_setn(r->headers_out, "Last-Modified", datestr); } } AP_IMPLEMENT_HOOK_RUN_ALL(int,post_read_request, (request_rec *r), (r), OK, DECLINED) AP_IMPLEMENT_HOOK_RUN_ALL(int,log_transaction, (request_rec *r), (r), OK, DECLINED) AP_IMPLEMENT_HOOK_RUN_FIRST(const char *,http_method, (const request_rec *r), (r), NULL) AP_IMPLEMENT_HOOK_RUN_FIRST(unsigned short,default_port, (const request_rec *r), (r), 0)