buckets/apr_buckets_socket.c

   1 /* Licensed to the Apache Software Foundation (ASF) under one or more
   2  * contributor license agreements.  See the NOTICE file distributed with
   3  * this work for additional information regarding copyright ownership.
   4  * The ASF licenses this file to You under the Apache License, Version 2.0
   5  * (the "License"); you may not use this file except in compliance with
   6  * the License.  You may obtain a copy of the License at
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #include "apr_buckets.h"
  18
  19 static apr_status_t socket_bucket_read(apr_bucket *a, const char **str,
  20                                        apr_size_t *len, apr_read_type_e block)
  21 {
  22     apr_socket_t *p = a->data;
  23     char *buf;
  24     apr_status_t rv;
  25     apr_interval_time_t timeout;
  26
  27     if (block == APR_NONBLOCK_READ) {
  28         apr_socket_timeout_get(p, &timeout);
  29         apr_socket_timeout_set(p, 0);
  30     }
  31
  32     *str = NULL;
  33     *len = APR_BUCKET_BUFF_SIZE;
  34     buf = apr_bucket_alloc(*len, a->list); /* XXX: check for failure? */
  35
  36     rv = apr_socket_recv(p, buf, len);
  37
  38     if (block == APR_NONBLOCK_READ) {
  39         apr_socket_timeout_set(p, timeout);
  40     }
  41
  42     if (rv != APR_SUCCESS && rv != APR_EOF) {
  43         apr_bucket_free(buf);
  44         return rv;
  45     }
  46     /*
  47      * If there's more to read we have to keep the rest of the socket
  48      * for later. XXX: Note that more complicated bucket types that
  49      * refer to data not in memory and must therefore have a read()
  50      * function similar to this one should be wary of copying this
  51      * code because if they have a destroy function they probably
  52      * want to migrate the bucket's subordinate structure from the
  53      * old bucket to a raw new one and adjust it as appropriate,
  54      * rather than destroying the old one and creating a completely
  55      * new bucket.
  56      *
  57      * Even if there is nothing more to read, don't close the socket here
  58      * as we have to use it to send any response :)  We could shut it
  59      * down for reading, but there is no benefit to doing so.
  60      */
  61     if (*len > 0) {
  62         apr_bucket_heap *h;
  63         /* Change the current bucket to refer to what we read */
  64         a = apr_bucket_heap_make(a, buf, *len, apr_bucket_free);
  65         h = a->data;
  66         h->alloc_len = APR_BUCKET_BUFF_SIZE; /* note the real buffer size */
  67         *str = buf;
  68         APR_BUCKET_INSERT_AFTER(a, apr_bucket_socket_create(p, a->list));
  69     }
  70     else {
  71         apr_bucket_free(buf);
  72         a = apr_bucket_immortal_make(a, "", 0);
  73         *str = a->data;
  74     }
  75     return APR_SUCCESS;
  76 }
  77
  78 APU_DECLARE(apr_bucket *) apr_bucket_socket_make(apr_bucket *b, apr_socket_t *p)
  79 {
  80     /*
  81      * XXX: We rely on a cleanup on some pool or other to actually
  82      * destroy the socket. We should probably explicitly call apr to
  83      * destroy it instead.
  84      *
  85      * Note that typically the socket is allocated from the connection pool
  86      * so it will disappear when the connection is finished.
  87      */
  88     b->type        = &apr_bucket_type_socket;
  89     b->length      = (apr_size_t)(-1);
  90     b->start       = -1;
  91     b->data        = p;
  92
  93     return b;
  94 }
  95
  96 APU_DECLARE(apr_bucket *) apr_bucket_socket_create(apr_socket_t *p,
  97                                                    apr_bucket_alloc_t *list)
  98 {
  99     apr_bucket *b = apr_bucket_alloc(sizeof(*b), list);
 100
 101     APR_BUCKET_INIT(b);
 102     b->free = apr_bucket_free;
 103     b->list = list;
 104     return apr_bucket_socket_make(b, p);
 105 }
 106
 107 APU_DECLARE_DATA const apr_bucket_type_t apr_bucket_type_socket = {
 108     "SOCKET", 5, APR_BUCKET_DATA,
 109     apr_bucket_destroy_noop,
 110     socket_bucket_read,
 111     apr_bucket_setaside_notimpl,
 112     apr_bucket_split_notimpl,
 113     apr_bucket_copy_notimpl
 114 };