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, Linus Nielsen Feltzing, <linus@haxx.se>
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9 | * Copyright (C) 2012 - 2015, 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 "rawstr.h"
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34 | #include "conncache.h"
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35 | #include "curl_printf.h"
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36 |
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37 | #include "curl_memory.h"
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38 | /* The last #include file should be: */
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39 | #include "memdebug.h"
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40 |
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41 | static void conn_llist_dtor(void *user, void *element)
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42 | {
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43 | struct connectdata *data = element;
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44 | (void)user;
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45 |
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46 | data->bundle = NULL;
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47 | }
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48 |
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49 | static CURLcode bundle_create(struct SessionHandle *data,
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50 | struct connectbundle **cb_ptr)
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51 | {
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52 | (void)data;
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53 | DEBUGASSERT(*cb_ptr == NULL);
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54 | *cb_ptr = malloc(sizeof(struct connectbundle));
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55 | if(!*cb_ptr)
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56 | return CURLE_OUT_OF_MEMORY;
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57 |
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58 | (*cb_ptr)->num_connections = 0;
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59 | (*cb_ptr)->multiuse = BUNDLE_UNKNOWN;
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60 |
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61 | (*cb_ptr)->conn_list = Curl_llist_alloc((curl_llist_dtor) conn_llist_dtor);
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62 | if(!(*cb_ptr)->conn_list) {
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63 | Curl_safefree(*cb_ptr);
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64 | return CURLE_OUT_OF_MEMORY;
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65 | }
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66 | return CURLE_OK;
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67 | }
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68 |
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69 | static void bundle_destroy(struct connectbundle *cb_ptr)
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70 | {
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71 | if(!cb_ptr)
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72 | return;
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73 |
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74 | if(cb_ptr->conn_list) {
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75 | Curl_llist_destroy(cb_ptr->conn_list, NULL);
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76 | cb_ptr->conn_list = NULL;
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77 | }
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78 | free(cb_ptr);
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79 | }
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80 |
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81 | /* Add a connection to a bundle */
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82 | static CURLcode bundle_add_conn(struct connectbundle *cb_ptr,
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83 | struct connectdata *conn)
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84 | {
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85 | if(!Curl_llist_insert_next(cb_ptr->conn_list, cb_ptr->conn_list->tail, conn))
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86 | return CURLE_OUT_OF_MEMORY;
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87 |
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88 | conn->bundle = cb_ptr;
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89 |
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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 | return Curl_hash_init(&connc->hash, size, Curl_hash_str,
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123 | Curl_str_key_compare, free_bundle_hash_entry);
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124 | }
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125 |
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126 | void Curl_conncache_destroy(struct conncache *connc)
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127 | {
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128 | if(connc)
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129 | Curl_hash_destroy(&connc->hash);
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130 | }
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131 |
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132 | /* returns an allocated key to find a bundle for this connection */
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133 | static char *hashkey(struct connectdata *conn)
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134 | {
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135 | return aprintf("%s:%d",
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136 | conn->bits.proxy?conn->proxy.name:conn->host.name,
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137 | conn->localport);
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138 | }
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139 |
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140 | /* Look up the bundle with all the connections to the same host this
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141 | connectdata struct is setup to use. */
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142 | struct connectbundle *Curl_conncache_find_bundle(struct connectdata *conn,
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143 | struct conncache *connc)
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144 | {
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145 | struct connectbundle *bundle = NULL;
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146 | if(connc) {
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147 | char *key = hashkey(conn);
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148 | if(key) {
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149 | bundle = Curl_hash_pick(&connc->hash, key, strlen(key));
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150 | free(key);
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151 | }
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152 | }
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153 |
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154 | return bundle;
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155 | }
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156 |
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157 | static bool conncache_add_bundle(struct conncache *connc,
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158 | char *key,
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159 | struct connectbundle *bundle)
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160 | {
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161 | void *p = Curl_hash_add(&connc->hash, key, strlen(key), bundle);
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162 |
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163 | return p?TRUE:FALSE;
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164 | }
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165 |
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166 | static void conncache_remove_bundle(struct conncache *connc,
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167 | struct connectbundle *bundle)
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168 | {
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169 | struct curl_hash_iterator iter;
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170 | struct curl_hash_element *he;
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171 |
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172 | if(!connc)
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173 | return;
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174 |
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175 | Curl_hash_start_iterate(&connc->hash, &iter);
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176 |
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177 | he = Curl_hash_next_element(&iter);
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178 | while(he) {
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179 | if(he->ptr == bundle) {
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180 | /* The bundle is destroyed by the hash destructor function,
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181 | free_bundle_hash_entry() */
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182 | Curl_hash_delete(&connc->hash, he->key, he->key_len);
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183 | return;
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184 | }
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185 |
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186 | he = Curl_hash_next_element(&iter);
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187 | }
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188 | }
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189 |
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190 | CURLcode Curl_conncache_add_conn(struct conncache *connc,
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191 | struct connectdata *conn)
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192 | {
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193 | CURLcode result;
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194 | struct connectbundle *bundle;
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195 | struct connectbundle *new_bundle = NULL;
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196 | struct SessionHandle *data = conn->data;
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197 |
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198 | bundle = Curl_conncache_find_bundle(conn, data->state.conn_cache);
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199 | if(!bundle) {
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200 | char *key;
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201 | int rc;
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202 |
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203 | result = bundle_create(data, &new_bundle);
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204 | if(result)
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205 | return result;
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206 |
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207 | key = hashkey(conn);
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208 | if(!key) {
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209 | bundle_destroy(new_bundle);
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210 | return CURLE_OUT_OF_MEMORY;
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211 | }
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212 |
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213 | rc = conncache_add_bundle(data->state.conn_cache, key, new_bundle);
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214 | free(key);
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215 | if(!rc) {
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216 | bundle_destroy(new_bundle);
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217 | return CURLE_OUT_OF_MEMORY;
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218 | }
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219 | bundle = new_bundle;
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220 | }
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221 |
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222 | result = bundle_add_conn(bundle, conn);
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223 | if(result) {
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224 | if(new_bundle)
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225 | conncache_remove_bundle(data->state.conn_cache, new_bundle);
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226 | return result;
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227 | }
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228 |
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229 | conn->connection_id = connc->next_connection_id++;
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230 | connc->num_connections++;
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231 |
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232 | DEBUGF(infof(conn->data, "Added connection %ld. "
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233 | "The cache now contains %" CURL_FORMAT_CURL_OFF_TU " members\n",
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234 | conn->connection_id, (curl_off_t) connc->num_connections));
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235 |
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236 | return CURLE_OK;
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237 | }
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238 |
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239 | void Curl_conncache_remove_conn(struct conncache *connc,
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240 | struct connectdata *conn)
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241 | {
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242 | struct connectbundle *bundle = conn->bundle;
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243 |
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244 | /* The bundle pointer can be NULL, since this function can be called
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245 | due to a failed connection attempt, before being added to a bundle */
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246 | if(bundle) {
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247 | bundle_remove_conn(bundle, conn);
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248 | if(bundle->num_connections == 0) {
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249 | conncache_remove_bundle(connc, bundle);
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250 | }
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251 |
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252 | if(connc) {
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253 | connc->num_connections--;
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254 |
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255 | DEBUGF(infof(conn->data, "The cache now contains %"
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256 | CURL_FORMAT_CURL_OFF_TU " members\n",
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257 | (curl_off_t) connc->num_connections));
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258 | }
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259 | }
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260 | }
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261 |
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262 | /* This function iterates the entire connection cache and calls the
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263 | function func() with the connection pointer as the first argument
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264 | and the supplied 'param' argument as the other,
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265 |
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266 | Return 0 from func() to continue the loop, return 1 to abort it.
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267 | */
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268 | void Curl_conncache_foreach(struct conncache *connc,
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269 | void *param,
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270 | int (*func)(struct connectdata *conn, void *param))
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271 | {
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272 | struct curl_hash_iterator iter;
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273 | struct curl_llist_element *curr;
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274 | struct curl_hash_element *he;
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275 |
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276 | if(!connc)
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277 | return;
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278 |
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279 | Curl_hash_start_iterate(&connc->hash, &iter);
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280 |
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281 | he = Curl_hash_next_element(&iter);
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282 | while(he) {
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283 | struct connectbundle *bundle;
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284 |
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285 | bundle = he->ptr;
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286 | he = Curl_hash_next_element(&iter);
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287 |
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288 | curr = bundle->conn_list->head;
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289 | while(curr) {
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290 | /* Yes, we need to update curr before calling func(), because func()
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291 | might decide to remove the connection */
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292 | struct connectdata *conn = curr->ptr;
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293 | curr = curr->next;
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294 |
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295 | if(1 == func(conn, param))
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296 | return;
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297 | }
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298 | }
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299 | }
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300 |
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301 | /* Return the first connection found in the cache. Used when closing all
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302 | connections */
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303 | struct connectdata *
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304 | Curl_conncache_find_first_connection(struct conncache *connc)
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305 | {
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306 | struct curl_hash_iterator iter;
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307 | struct curl_hash_element *he;
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308 | struct connectbundle *bundle;
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309 |
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310 | Curl_hash_start_iterate(&connc->hash, &iter);
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311 |
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312 | he = Curl_hash_next_element(&iter);
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313 | while(he) {
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314 | struct curl_llist_element *curr;
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315 | bundle = he->ptr;
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316 |
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317 | curr = bundle->conn_list->head;
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318 | if(curr) {
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319 | return curr->ptr;
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320 | }
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321 |
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322 | he = Curl_hash_next_element(&iter);
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323 | }
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324 |
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325 | return NULL;
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326 | }
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327 |
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328 |
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329 | #if 0
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330 | /* Useful for debugging the connection cache */
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331 | void Curl_conncache_print(struct conncache *connc)
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332 | {
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333 | struct curl_hash_iterator iter;
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334 | struct curl_llist_element *curr;
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335 | struct curl_hash_element *he;
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336 |
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337 | if(!connc)
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338 | return;
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339 |
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340 | fprintf(stderr, "=Bundle cache=\n");
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341 |
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342 | Curl_hash_start_iterate(connc->hash, &iter);
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343 |
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344 | he = Curl_hash_next_element(&iter);
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345 | while(he) {
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346 | struct connectbundle *bundle;
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347 | struct connectdata *conn;
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348 |
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349 | bundle = he->ptr;
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350 |
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351 | fprintf(stderr, "%s -", he->key);
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352 | curr = bundle->conn_list->head;
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353 | while(curr) {
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354 | conn = curr->ptr;
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355 |
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356 | fprintf(stderr, " [%p %d]", (void *)conn, conn->inuse);
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357 | curr = curr->next;
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358 | }
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359 | fprintf(stderr, "\n");
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360 |
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361 | he = Curl_hash_next_element(&iter);
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362 | }
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363 | }
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364 | #endif
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