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 |
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472 | fprintf(stderr, "%s -", he->key);
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473 | curr = bundle->conn_list->head;
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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;
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479 | }
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480 | fprintf(stderr, "\n");
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481 |
|
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482 | he = Curl_hash_next_element(&iter);
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483 | }
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484 | }
|
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485 | #endif
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