[388] | 1 | /***************************************************************************
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| 2 | * _ _ ____ _
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| 3 | * Project ___| | | | _ \| |
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| 4 | * / __| | | | |_) | |
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| 5 | * | (__| |_| | _ <| |___
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| 6 | * \___|\___/|_| \_\_____|
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| 7 | *
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| 8 | * Copyright (C) 2012 - 2016, Linus Nielsen Feltzing, <linus@haxx.se>
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| 9 | * Copyright (C) 2012 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
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| 10 | *
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| 11 | * This software is licensed as described in the file COPYING, which
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| 12 | * you should have received as part of this distribution. The terms
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| 13 | * are also available at https://curl.haxx.se/docs/copyright.html.
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| 14 | *
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| 15 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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| 16 | * copies of the Software, and permit persons to whom the Software is
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| 17 | * furnished to do so, under the terms of the COPYING file.
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| 18 | *
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| 19 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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| 20 | * KIND, either express or implied.
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| 21 | *
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| 22 | ***************************************************************************/
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| 23 |
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| 24 | #include "curl_setup.h"
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| 25 |
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| 26 | #include <curl/curl.h>
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| 27 |
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| 28 | #include "urldata.h"
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| 29 | #include "url.h"
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| 30 | #include "progress.h"
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| 31 | #include "multiif.h"
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| 32 | #include "sendf.h"
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| 33 | #include "conncache.h"
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| 34 | #include "share.h"
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| 35 | #include "sigpipe.h"
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| 36 | #include "connect.h"
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| 37 |
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| 38 | /* The last 3 #include files should be in this order */
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| 39 | #include "curl_printf.h"
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| 40 | #include "curl_memory.h"
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| 41 | #include "memdebug.h"
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| 42 |
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| 43 | #define CONN_LOCK(x) if((x)->share) \
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| 44 | Curl_share_lock((x), CURL_LOCK_DATA_CONNECT, CURL_LOCK_ACCESS_SINGLE)
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| 45 | #define CONN_UNLOCK(x) if((x)->share) \
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| 46 | Curl_share_unlock((x), CURL_LOCK_DATA_CONNECT)
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| 47 |
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| 48 |
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| 49 | static void conn_llist_dtor(void *user, void *element)
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| 50 | {
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| 51 | struct connectdata *data = element;
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| 52 | (void)user;
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| 53 |
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| 54 | data->bundle = NULL;
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| 55 | }
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| 56 |
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| 57 | static CURLcode bundle_create(struct Curl_easy *data,
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| 58 | struct connectbundle **cb_ptr)
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| 59 | {
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| 60 | (void)data;
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| 61 | DEBUGASSERT(*cb_ptr == NULL);
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| 62 | *cb_ptr = malloc(sizeof(struct connectbundle));
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| 63 | if(!*cb_ptr)
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| 64 | return CURLE_OUT_OF_MEMORY;
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| 65 |
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| 66 | (*cb_ptr)->num_connections = 0;
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| 67 | (*cb_ptr)->multiuse = BUNDLE_UNKNOWN;
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| 68 |
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| 69 | Curl_llist_init(&(*cb_ptr)->conn_list, (curl_llist_dtor) conn_llist_dtor);
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| 70 | return CURLE_OK;
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| 71 | }
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| 72 |
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| 73 | static void bundle_destroy(struct connectbundle *cb_ptr)
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| 74 | {
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| 75 | if(!cb_ptr)
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| 76 | return;
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| 77 |
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| 78 | Curl_llist_destroy(&cb_ptr->conn_list, NULL);
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| 79 |
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| 80 | free(cb_ptr);
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| 81 | }
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| 82 |
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| 83 | /* Add a connection to a bundle */
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| 84 | static CURLcode bundle_add_conn(struct connectbundle *cb_ptr,
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| 85 | struct connectdata *conn)
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| 86 | {
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| 87 | Curl_llist_insert_next(&cb_ptr->conn_list, cb_ptr->conn_list.tail, conn,
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| 88 | &conn->bundle_node);
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| 89 | conn->bundle = cb_ptr;
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| 90 | cb_ptr->num_connections++;
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| 91 | return CURLE_OK;
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| 92 | }
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| 93 |
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| 94 | /* Remove a connection from a bundle */
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| 95 | static int bundle_remove_conn(struct connectbundle *cb_ptr,
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| 96 | struct connectdata *conn)
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| 97 | {
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| 98 | struct curl_llist_element *curr;
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| 99 |
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| 100 | curr = cb_ptr->conn_list.head;
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| 101 | while(curr) {
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| 102 | if(curr->ptr == conn) {
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| 103 | Curl_llist_remove(&cb_ptr->conn_list, curr, NULL);
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| 104 | cb_ptr->num_connections--;
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| 105 | conn->bundle = NULL;
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| 106 | return 1; /* we removed a handle */
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| 107 | }
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| 108 | curr = curr->next;
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| 109 | }
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| 110 | return 0;
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| 111 | }
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| 112 |
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| 113 | static void free_bundle_hash_entry(void *freethis)
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| 114 | {
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| 115 | struct connectbundle *b = (struct connectbundle *) freethis;
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| 116 |
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| 117 | bundle_destroy(b);
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| 118 | }
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| 119 |
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| 120 | int Curl_conncache_init(struct conncache *connc, int size)
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| 121 | {
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| 122 | int rc;
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| 123 |
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| 124 | /* allocate a new easy handle to use when closing cached connections */
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| 125 | connc->closure_handle = curl_easy_init();
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| 126 | if(!connc->closure_handle)
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| 127 | return 1; /* bad */
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| 128 |
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| 129 | rc = Curl_hash_init(&connc->hash, size, Curl_hash_str,
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| 130 | Curl_str_key_compare, free_bundle_hash_entry);
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| 131 | if(rc) {
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| 132 | Curl_close(connc->closure_handle);
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| 133 | connc->closure_handle = NULL;
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| 134 | }
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| 135 | else
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| 136 | connc->closure_handle->state.conn_cache = connc;
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| 137 |
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| 138 | return rc;
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| 139 | }
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| 140 |
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| 141 | void Curl_conncache_destroy(struct conncache *connc)
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| 142 | {
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| 143 | if(connc)
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| 144 | Curl_hash_destroy(&connc->hash);
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| 145 | }
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| 146 |
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| 147 | /* creates a key to find a bundle for this connection */
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| 148 | static void hashkey(struct connectdata *conn, char *buf,
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| 149 | size_t len) /* something like 128 is fine */
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| 150 | {
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| 151 | const char *hostname;
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| 152 |
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| 153 | if(conn->bits.socksproxy)
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| 154 | hostname = conn->socks_proxy.host.name;
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| 155 | else if(conn->bits.httpproxy)
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| 156 | hostname = conn->http_proxy.host.name;
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| 157 | else if(conn->bits.conn_to_host)
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| 158 | hostname = conn->conn_to_host.name;
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| 159 | else
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| 160 | hostname = conn->host.name;
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| 161 |
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| 162 | DEBUGASSERT(len > 32);
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| 163 |
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| 164 | /* put the number first so that the hostname gets cut off if too long */
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| 165 | snprintf(buf, len, "%ld%s", conn->port, hostname);
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| 166 | }
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| 167 |
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| 168 | /* Look up the bundle with all the connections to the same host this
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| 169 | connectdata struct is setup to use. */
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| 170 | struct connectbundle *Curl_conncache_find_bundle(struct connectdata *conn,
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| 171 | struct conncache *connc)
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| 172 | {
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| 173 | struct connectbundle *bundle = NULL;
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| 174 | if(connc) {
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| 175 | char key[128];
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| 176 | hashkey(conn, key, sizeof(key));
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| 177 | CONN_LOCK(conn->data);
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| 178 | bundle = Curl_hash_pick(&connc->hash, key, strlen(key));
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| 179 | CONN_UNLOCK(conn->data);
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| 180 | }
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| 181 |
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| 182 | return bundle;
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| 183 | }
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| 184 |
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| 185 | static bool conncache_add_bundle(struct conncache *connc,
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| 186 | char *key,
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| 187 | struct connectbundle *bundle)
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| 188 | {
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| 189 | void *p = Curl_hash_add(&connc->hash, key, strlen(key), bundle);
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| 190 |
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| 191 | return p?TRUE:FALSE;
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| 192 | }
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| 193 |
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| 194 | static void conncache_remove_bundle(struct conncache *connc,
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| 195 | struct connectbundle *bundle)
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| 196 | {
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| 197 | struct curl_hash_iterator iter;
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| 198 | struct curl_hash_element *he;
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| 199 |
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| 200 | if(!connc)
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| 201 | return;
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| 202 |
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| 203 | Curl_hash_start_iterate(&connc->hash, &iter);
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| 204 |
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| 205 | he = Curl_hash_next_element(&iter);
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| 206 | while(he) {
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| 207 | if(he->ptr == bundle) {
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| 208 | /* The bundle is destroyed by the hash destructor function,
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| 209 | free_bundle_hash_entry() */
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| 210 | Curl_hash_delete(&connc->hash, he->key, he->key_len);
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| 211 | return;
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| 212 | }
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| 213 |
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| 214 | he = Curl_hash_next_element(&iter);
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| 215 | }
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| 216 | }
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| 217 |
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| 218 | CURLcode Curl_conncache_add_conn(struct conncache *connc,
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| 219 | struct connectdata *conn)
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| 220 | {
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| 221 | CURLcode result;
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| 222 | struct connectbundle *bundle;
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| 223 | struct connectbundle *new_bundle = NULL;
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| 224 | struct Curl_easy *data = conn->data;
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| 225 |
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| 226 | bundle = Curl_conncache_find_bundle(conn, data->state.conn_cache);
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| 227 | if(!bundle) {
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| 228 | int rc;
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| 229 | char key[128];
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| 230 |
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| 231 | result = bundle_create(data, &new_bundle);
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| 232 | if(result)
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| 233 | return result;
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| 234 |
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| 235 | hashkey(conn, key, sizeof(key));
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| 236 | CONN_LOCK(data);
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| 237 | rc = conncache_add_bundle(data->state.conn_cache, key, new_bundle);
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| 238 | CONN_UNLOCK(data);
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| 239 |
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| 240 | if(!rc) {
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| 241 | bundle_destroy(new_bundle);
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| 242 | return CURLE_OUT_OF_MEMORY;
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| 243 | }
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| 244 | bundle = new_bundle;
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| 245 | }
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| 246 |
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| 247 | CONN_LOCK(data);
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| 248 | result = bundle_add_conn(bundle, conn);
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| 249 | if(result) {
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| 250 | if(new_bundle)
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| 251 | conncache_remove_bundle(data->state.conn_cache, new_bundle);
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| 252 | CONN_UNLOCK(data);
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| 253 | return result;
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| 254 | }
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| 255 | CONN_UNLOCK(data);
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| 256 |
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| 257 | conn->connection_id = connc->next_connection_id++;
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| 258 | connc->num_connections++;
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| 259 |
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| 260 | DEBUGF(infof(conn->data, "Added connection %ld. "
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| 261 | "The cache now contains %" CURL_FORMAT_CURL_OFF_TU " members\n",
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| 262 | conn->connection_id, (curl_off_t) connc->num_connections));
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| 263 |
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| 264 | return CURLE_OK;
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| 265 | }
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| 266 |
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| 267 | void Curl_conncache_remove_conn(struct conncache *connc,
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| 268 | struct connectdata *conn)
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| 269 | {
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| 270 | struct connectbundle *bundle = conn->bundle;
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| 271 |
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| 272 | /* The bundle pointer can be NULL, since this function can be called
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| 273 | due to a failed connection attempt, before being added to a bundle */
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| 274 | if(bundle) {
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| 275 | CONN_LOCK(conn->data);
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| 276 | bundle_remove_conn(bundle, conn);
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| 277 | if(bundle->num_connections == 0)
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| 278 | conncache_remove_bundle(connc, bundle);
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| 279 | CONN_UNLOCK(conn->data);
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| 280 | if(connc) {
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| 281 | connc->num_connections--;
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| 282 |
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| 283 | DEBUGF(infof(conn->data, "The cache now contains %"
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| 284 | CURL_FORMAT_CURL_OFF_TU " members\n",
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| 285 | (curl_off_t) connc->num_connections));
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| 286 | }
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| 287 | }
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| 288 | }
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| 289 |
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| 290 | /* This function iterates the entire connection cache and calls the
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| 291 | function func() with the connection pointer as the first argument
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| 292 | and the supplied 'param' argument as the other,
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| 293 |
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| 294 | Return 0 from func() to continue the loop, return 1 to abort it.
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| 295 | */
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| 296 | void Curl_conncache_foreach(struct Curl_easy *data,
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| 297 | struct conncache *connc,
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| 298 | void *param,
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| 299 | int (*func)(struct connectdata *conn, void *param))
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| 300 | {
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| 301 | struct curl_hash_iterator iter;
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| 302 | struct curl_llist_element *curr;
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| 303 | struct curl_hash_element *he;
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| 304 |
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| 305 | if(!connc)
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| 306 | return;
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| 307 |
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| 308 | CONN_LOCK(data);
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| 309 | Curl_hash_start_iterate(&connc->hash, &iter);
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| 310 |
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| 311 | he = Curl_hash_next_element(&iter);
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| 312 | while(he) {
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| 313 | struct connectbundle *bundle;
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| 314 |
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| 315 | bundle = he->ptr;
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| 316 | he = Curl_hash_next_element(&iter);
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| 317 |
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| 318 | curr = bundle->conn_list.head;
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| 319 | while(curr) {
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| 320 | /* Yes, we need to update curr before calling func(), because func()
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| 321 | might decide to remove the connection */
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| 322 | struct connectdata *conn = curr->ptr;
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| 323 | curr = curr->next;
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| 324 |
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| 325 | if(1 == func(conn, param)) {
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| 326 | CONN_UNLOCK(data);
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| 327 | return;
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| 328 | }
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| 329 | }
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| 330 | }
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| 331 | CONN_UNLOCK(data);
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| 332 | }
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| 333 |
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| 334 | /* Return the first connection found in the cache. Used when closing all
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| 335 | connections.
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| 336 |
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| 337 | NOTE: no locking is done here as this is presumably only done when cleaning
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| 338 | up a cache!
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| 339 | */
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| 340 | struct connectdata *
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| 341 | Curl_conncache_find_first_connection(struct conncache *connc)
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| 342 | {
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| 343 | struct curl_hash_iterator iter;
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| 344 | struct curl_hash_element *he;
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| 345 | struct connectbundle *bundle;
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| 346 |
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| 347 | Curl_hash_start_iterate(&connc->hash, &iter);
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| 348 |
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| 349 | he = Curl_hash_next_element(&iter);
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| 350 | while(he) {
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| 351 | struct curl_llist_element *curr;
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| 352 | bundle = he->ptr;
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| 353 |
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| 354 | curr = bundle->conn_list.head;
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| 355 | if(curr) {
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| 356 | return curr->ptr;
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| 357 | }
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| 358 |
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| 359 | he = Curl_hash_next_element(&iter);
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| 360 | }
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| 361 |
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| 362 | return NULL;
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| 363 | }
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| 364 |
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| 365 | /*
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| 366 | * This function finds the connection in the connection
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| 367 | * cache that has been unused for the longest time.
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| 368 | *
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| 369 | * Returns the pointer to the oldest idle connection, or NULL if none was
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| 370 | * found.
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| 371 | */
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| 372 | struct connectdata *
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| 373 | Curl_conncache_oldest_idle(struct Curl_easy *data)
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| 374 | {
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| 375 | struct conncache *bc = data->state.conn_cache;
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| 376 | struct curl_hash_iterator iter;
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| 377 | struct curl_llist_element *curr;
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| 378 | struct curl_hash_element *he;
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| 379 | timediff_t highscore =- 1;
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| 380 | timediff_t score;
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| 381 | struct curltime now;
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| 382 | struct connectdata *conn_candidate = NULL;
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| 383 | struct connectbundle *bundle;
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| 384 |
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| 385 | now = Curl_now();
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| 386 |
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| 387 | CONN_LOCK(data);
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| 388 | Curl_hash_start_iterate(&bc->hash, &iter);
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| 389 |
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| 390 | he = Curl_hash_next_element(&iter);
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| 391 | while(he) {
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| 392 | struct connectdata *conn;
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| 393 |
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| 394 | bundle = he->ptr;
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| 395 |
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| 396 | curr = bundle->conn_list.head;
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| 397 | while(curr) {
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| 398 | conn = curr->ptr;
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| 399 |
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| 400 | if(!conn->inuse) {
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| 401 | /* Set higher score for the age passed since the connection was used */
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| 402 | score = Curl_timediff(now, conn->now);
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| 403 |
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| 404 | if(score > highscore) {
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| 405 | highscore = score;
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| 406 | conn_candidate = conn;
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| 407 | }
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| 408 | }
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| 409 | curr = curr->next;
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| 410 | }
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| 411 |
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| 412 | he = Curl_hash_next_element(&iter);
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| 413 | }
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| 414 | CONN_UNLOCK(data);
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| 415 |
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| 416 | return conn_candidate;
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| 417 | }
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| 418 |
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| 419 | void Curl_conncache_close_all_connections(struct conncache *connc)
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| 420 | {
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| 421 | struct connectdata *conn;
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| 422 |
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| 423 | conn = Curl_conncache_find_first_connection(connc);
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| 424 | while(conn) {
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| 425 | SIGPIPE_VARIABLE(pipe_st);
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| 426 | conn->data = connc->closure_handle;
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| 427 |
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| 428 | sigpipe_ignore(conn->data, &pipe_st);
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| 429 | conn->data->easy_conn = NULL; /* clear the easy handle's connection
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| 430 | pointer */
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| 431 | /* This will remove the connection from the cache */
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| 432 | connclose(conn, "kill all");
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| 433 | (void)Curl_disconnect(conn, FALSE);
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| 434 | sigpipe_restore(&pipe_st);
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| 435 |
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| 436 | conn = Curl_conncache_find_first_connection(connc);
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| 437 | }
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| 438 |
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| 439 | if(connc->closure_handle) {
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| 440 | SIGPIPE_VARIABLE(pipe_st);
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| 441 | sigpipe_ignore(connc->closure_handle, &pipe_st);
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| 442 |
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| 443 | Curl_hostcache_clean(connc->closure_handle,
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| 444 | connc->closure_handle->dns.hostcache);
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| 445 | Curl_close(connc->closure_handle);
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| 446 | sigpipe_restore(&pipe_st);
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| 447 | }
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| 448 | }
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| 449 |
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| 450 | #if 0
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| 451 | /* Useful for debugging the connection cache */
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| 452 | void Curl_conncache_print(struct conncache *connc)
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| 453 | {
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| 454 | struct curl_hash_iterator iter;
|
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| 455 | struct curl_llist_element *curr;
|
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| 456 | struct curl_hash_element *he;
|
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| 457 |
|
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| 458 | if(!connc)
|
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| 459 | return;
|
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| 460 |
|
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| 461 | fprintf(stderr, "=Bundle cache=\n");
|
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| 462 |
|
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| 463 | Curl_hash_start_iterate(connc->hash, &iter);
|
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| 464 |
|
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| 465 | he = Curl_hash_next_element(&iter);
|
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| 466 | while(he) {
|
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| 467 | struct connectbundle *bundle;
|
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| 468 | struct connectdata *conn;
|
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| 469 |
|
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| 470 | bundle = he->ptr;
|
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| 471 |
|
---|
| 472 | fprintf(stderr, "%s -", he->key);
|
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| 473 | curr = bundle->conn_list->head;
|
---|
| 474 | while(curr) {
|
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| 475 | conn = curr->ptr;
|
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| 476 |
|
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| 477 | fprintf(stderr, " [%p %d]", (void *)conn, conn->inuse);
|
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| 478 | curr = curr->next;
|
---|
| 479 | }
|
---|
| 480 | fprintf(stderr, "\n");
|
---|
| 481 |
|
---|
| 482 | he = Curl_hash_next_element(&iter);
|
---|
| 483 | }
|
---|
| 484 | }
|
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| 485 | #endif
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