http.c

   1 #include "http.h"
   2
   3 int data_received;
   4 int active_requests = 0;
   5
   6 #ifdef USE_CURL_MULTI
   7 int max_requests = -1;
   8 CURLM *curlm;
   9 #endif
  10 #ifndef NO_CURL_EASY_DUPHANDLE
  11 CURL *curl_default;
  12 #endif
  13 char curl_errorstr[CURL_ERROR_SIZE];
  14
  15 int curl_ssl_verify = -1;
  16 char *ssl_cert = NULL;
  17 #if LIBCURL_VERSION_NUM >= 0x070902
  18 char *ssl_key = NULL;
  19 #endif
  20 #if LIBCURL_VERSION_NUM >= 0x070908
  21 char *ssl_capath = NULL;
  22 #endif
  23 char *ssl_cainfo = NULL;
  24 long curl_low_speed_limit = -1;
  25 long curl_low_speed_time = -1;
  26
  27 struct curl_slist *pragma_header;
  28 struct curl_slist *no_range_header;
  29
  30 struct active_request_slot *active_queue_head = NULL;
  31
  32 size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb,
  33                            struct buffer *buffer)
  34 {
  35         size_t size = eltsize * nmemb;
  36         if (size > buffer->size - buffer->posn)
  37                 size = buffer->size - buffer->posn;
  38         memcpy(ptr, buffer->buffer + buffer->posn, size);
  39         buffer->posn += size;
  40         return size;
  41 }
  42
  43 size_t fwrite_buffer(const void *ptr, size_t eltsize,
  44                             size_t nmemb, struct buffer *buffer)
  45 {
  46         size_t size = eltsize * nmemb;
  47         if (size > buffer->size - buffer->posn) {
  48                 buffer->size = buffer->size * 3 / 2;
  49                 if (buffer->size < buffer->posn + size)
  50                         buffer->size = buffer->posn + size;
  51                 buffer->buffer = xrealloc(buffer->buffer, buffer->size);
  52         }
  53         memcpy(buffer->buffer + buffer->posn, ptr, size);
  54         buffer->posn += size;
  55         data_received++;
  56         return size;
  57 }
  58
  59 size_t fwrite_null(const void *ptr, size_t eltsize,
  60                           size_t nmemb, struct buffer *buffer)
  61 {
  62         data_received++;
  63         return eltsize * nmemb;
  64 }
  65
  66 static void finish_active_slot(struct active_request_slot *slot);
  67
  68 #ifdef USE_CURL_MULTI
  69 static void process_curl_messages(void)
  70 {
  71         int num_messages;
  72         struct active_request_slot *slot;
  73         CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
  74
  75         while (curl_message != NULL) {
  76                 if (curl_message->msg == CURLMSG_DONE) {
  77                         int curl_result = curl_message->data.result;
  78                         slot = active_queue_head;
  79                         while (slot != NULL &&
  80                                slot->curl != curl_message->easy_handle)
  81                                 slot = slot->next;
  82                         if (slot != NULL) {
  83                                 curl_multi_remove_handle(curlm, slot->curl);
  84                                 slot->curl_result = curl_result;
  85                                 finish_active_slot(slot);
  86                         } else {
  87                                 fprintf(stderr, "Received DONE message for unknown request!\n");
  88                         }
  89                 } else {
  90                         fprintf(stderr, "Unknown CURL message received: %d\n",
  91                                 (int)curl_message->msg);
  92                 }
  93                 curl_message = curl_multi_info_read(curlm, &num_messages);
  94         }
  95 }
  96 #endif
  97
  98 static int http_options(const char *var, const char *value)
  99 {
 100         if (!strcmp("http.sslverify", var)) {
 101                 if (curl_ssl_verify == -1) {
 102                         curl_ssl_verify = git_config_bool(var, value);
 103                 }
 104                 return 0;
 105         }
 106
 107         if (!strcmp("http.sslcert", var)) {
 108                 if (ssl_cert == NULL) {
 109                         ssl_cert = xmalloc(strlen(value)+1);
 110                         strcpy(ssl_cert, value);
 111                 }
 112                 return 0;
 113         }
 114 #if LIBCURL_VERSION_NUM >= 0x070902
 115         if (!strcmp("http.sslkey", var)) {
 116                 if (ssl_key == NULL) {
 117                         ssl_key = xmalloc(strlen(value)+1);
 118                         strcpy(ssl_key, value);
 119                 }
 120                 return 0;
 121         }
 122 #endif
 123 #if LIBCURL_VERSION_NUM >= 0x070908
 124         if (!strcmp("http.sslcapath", var)) {
 125                 if (ssl_capath == NULL) {
 126                         ssl_capath = xmalloc(strlen(value)+1);
 127                         strcpy(ssl_capath, value);
 128                 }
 129                 return 0;
 130         }
 131 #endif
 132         if (!strcmp("http.sslcainfo", var)) {
 133                 if (ssl_cainfo == NULL) {
 134                         ssl_cainfo = xmalloc(strlen(value)+1);
 135                         strcpy(ssl_cainfo, value);
 136                 }
 137                 return 0;
 138         }
 139
 140 #ifdef USE_CURL_MULTI
 141         if (!strcmp("http.maxrequests", var)) {
 142                 if (max_requests == -1)
 143                         max_requests = git_config_int(var, value);
 144                 return 0;
 145         }
 146 #endif
 147
 148         if (!strcmp("http.lowspeedlimit", var)) {
 149                 if (curl_low_speed_limit == -1)
 150                         curl_low_speed_limit = (long)git_config_int(var, value);
 151                 return 0;
 152         }
 153         if (!strcmp("http.lowspeedtime", var)) {
 154                 if (curl_low_speed_time == -1)
 155                         curl_low_speed_time = (long)git_config_int(var, value);
 156                 return 0;
 157         }
 158
 159         /* Fall back on the default ones */
 160         return git_default_config(var, value);
 161 }
 162
 163 static CURL* get_curl_handle(void)
 164 {
 165         CURL* result = curl_easy_init();
 166
 167         curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
 168 #if LIBCURL_VERSION_NUM >= 0x070907
 169         curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 170 #endif
 171
 172         if (ssl_cert != NULL)
 173                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 174 #if LIBCURL_VERSION_NUM >= 0x070902
 175         if (ssl_key != NULL)
 176                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 177 #endif
 178 #if LIBCURL_VERSION_NUM >= 0x070908
 179         if (ssl_capath != NULL)
 180                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 181 #endif
 182         if (ssl_cainfo != NULL)
 183                 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 184         curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 185
 186         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 187                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 188                                  curl_low_speed_limit);
 189                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 190                                  curl_low_speed_time);
 191         }
 192
 193         curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 194
 195         if (getenv("GIT_CURL_VERBOSE"))
 196                 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 197
 198         return result;
 199 }
 200
 201 void http_init(void)
 202 {
 203         char *low_speed_limit;
 204         char *low_speed_time;
 205
 206         curl_global_init(CURL_GLOBAL_ALL);
 207
 208         pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 209         no_range_header = curl_slist_append(no_range_header, "Range:");
 210
 211 #ifdef USE_CURL_MULTI
 212         {
 213                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 214                 if (http_max_requests != NULL)
 215                         max_requests = atoi(http_max_requests);
 216         }
 217
 218         curlm = curl_multi_init();
 219         if (curlm == NULL) {
 220                 fprintf(stderr, "Error creating curl multi handle.\n");
 221                 exit(1);
 222         }
 223 #endif
 224
 225         if (getenv("GIT_SSL_NO_VERIFY"))
 226                 curl_ssl_verify = 0;
 227
 228         ssl_cert = getenv("GIT_SSL_CERT");
 229 #if LIBCURL_VERSION_NUM >= 0x070902
 230         ssl_key = getenv("GIT_SSL_KEY");
 231 #endif
 232 #if LIBCURL_VERSION_NUM >= 0x070908
 233         ssl_capath = getenv("GIT_SSL_CAPATH");
 234 #endif
 235         ssl_cainfo = getenv("GIT_SSL_CAINFO");
 236
 237         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 238         if (low_speed_limit != NULL)
 239                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 240         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 241         if (low_speed_time != NULL)
 242                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 243
 244         git_config(http_options);
 245
 246         if (curl_ssl_verify == -1)
 247                 curl_ssl_verify = 1;
 248
 249 #ifdef USE_CURL_MULTI
 250         if (max_requests < 1)
 251                 max_requests = DEFAULT_MAX_REQUESTS;
 252 #endif
 253
 254 #ifndef NO_CURL_EASY_DUPHANDLE
 255         curl_default = get_curl_handle();
 256 #endif
 257 }
 258
 259 void http_cleanup(void)
 260 {
 261         struct active_request_slot *slot = active_queue_head;
 262 #ifdef USE_CURL_MULTI
 263         char *wait_url;
 264 #endif
 265
 266         while (slot != NULL) {
 267 #ifdef USE_CURL_MULTI
 268                 if (slot->in_use) {
 269                         curl_easy_getinfo(slot->curl,
 270                                           CURLINFO_EFFECTIVE_URL,
 271                                           &wait_url);
 272                         fprintf(stderr, "Waiting for %s\n", wait_url);
 273                         run_active_slot(slot);
 274                 }
 275 #endif
 276                 if (slot->curl != NULL)
 277                         curl_easy_cleanup(slot->curl);
 278                 slot = slot->next;
 279         }
 280
 281 #ifndef NO_CURL_EASY_DUPHANDLE
 282         curl_easy_cleanup(curl_default);
 283 #endif
 284
 285 #ifdef USE_CURL_MULTI
 286         curl_multi_cleanup(curlm);
 287 #endif
 288         curl_global_cleanup();
 289
 290 }
 291
 292 struct active_request_slot *get_active_slot(void)
 293 {
 294         struct active_request_slot *slot = active_queue_head;
 295         struct active_request_slot *newslot;
 296
 297 #ifdef USE_CURL_MULTI
 298         int num_transfers;
 299
 300         /* Wait for a slot to open up if the queue is full */
 301         while (active_requests >= max_requests) {
 302                 curl_multi_perform(curlm, &num_transfers);
 303                 if (num_transfers < active_requests) {
 304                         process_curl_messages();
 305                 }
 306         }
 307 #endif
 308
 309         while (slot != NULL && slot->in_use) {
 310                 slot = slot->next;
 311         }
 312         if (slot == NULL) {
 313                 newslot = xmalloc(sizeof(*newslot));
 314                 newslot->curl = NULL;
 315                 newslot->in_use = 0;
 316                 newslot->next = NULL;
 317
 318                 slot = active_queue_head;
 319                 if (slot == NULL) {
 320                         active_queue_head = newslot;
 321                 } else {
 322                         while (slot->next != NULL) {
 323                                 slot = slot->next;
 324                         }
 325                         slot->next = newslot;
 326                 }
 327                 slot = newslot;
 328         }
 329
 330         if (slot->curl == NULL) {
 331 #ifdef NO_CURL_EASY_DUPHANDLE
 332                 slot->curl = get_curl_handle();
 333 #else
 334                 slot->curl = curl_easy_duphandle(curl_default);
 335 #endif
 336         }
 337
 338         active_requests++;
 339         slot->in_use = 1;
 340         slot->local = NULL;
 341         slot->results = NULL;
 342         slot->callback_data = NULL;
 343         slot->callback_func = NULL;
 344         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 345         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_range_header);
 346         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 347
 348         return slot;
 349 }
 350
 351 int start_active_slot(struct active_request_slot *slot)
 352 {
 353 #ifdef USE_CURL_MULTI
 354         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 355
 356         if (curlm_result != CURLM_OK &&
 357             curlm_result != CURLM_CALL_MULTI_PERFORM) {
 358                 active_requests--;
 359                 slot->in_use = 0;
 360                 return 0;
 361         }
 362 #endif
 363         return 1;
 364 }
 365
 366 #ifdef USE_CURL_MULTI
 367 void step_active_slots(void)
 368 {
 369         int num_transfers;
 370         CURLMcode curlm_result;
 371
 372         do {
 373                 curlm_result = curl_multi_perform(curlm, &num_transfers);
 374         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 375         if (num_transfers < active_requests) {
 376                 process_curl_messages();
 377                 fill_active_slots();
 378         }
 379 }
 380 #endif
 381
 382 void run_active_slot(struct active_request_slot *slot)
 383 {
 384 #ifdef USE_CURL_MULTI
 385         long last_pos = 0;
 386         long current_pos;
 387         fd_set readfds;
 388         fd_set writefds;
 389         fd_set excfds;
 390         int max_fd;
 391         struct timeval select_timeout;
 392
 393         while (slot->in_use) {
 394                 data_received = 0;
 395                 step_active_slots();
 396
 397                 if (!data_received && slot->local != NULL) {
 398                         current_pos = ftell(slot->local);
 399                         if (current_pos > last_pos)
 400                                 data_received++;
 401                         last_pos = current_pos;
 402                 }
 403
 404                 if (slot->in_use && !data_received) {
 405                         max_fd = 0;
 406                         FD_ZERO(&readfds);
 407                         FD_ZERO(&writefds);
 408                         FD_ZERO(&excfds);
 409                         select_timeout.tv_sec = 0;
 410                         select_timeout.tv_usec = 50000;
 411                         select(max_fd, &readfds, &writefds,
 412                                &excfds, &select_timeout);
 413                 }
 414         }
 415 #else
 416         while (slot->in_use) {
 417                 slot->curl_result = curl_easy_perform(slot->curl);
 418                 finish_active_slot(slot);
 419         }
 420 #endif
 421 }
 422
 423 static void closedown_active_slot(struct active_request_slot *slot)
 424 {
 425         active_requests--;
 426         slot->in_use = 0;
 427 }
 428
 429 void release_active_slot(struct active_request_slot *slot)
 430 {
 431         closedown_active_slot(slot);
 432         if (slot->curl) {
 433                 curl_multi_remove_handle(curlm, slot->curl);
 434                 curl_easy_cleanup(slot->curl);
 435                 slot->curl = NULL;
 436         }
 437         fill_active_slots();
 438 }
 439
 440 static void finish_active_slot(struct active_request_slot *slot)
 441 {
 442         closedown_active_slot(slot);
 443         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 444
 445         /* Store slot results so they can be read after the slot is reused */
 446         if (slot->results != NULL) {
 447                 slot->results->curl_result = slot->curl_result;
 448                 slot->results->http_code = slot->http_code;
 449         }
 450
 451         /* Run callback if appropriate */
 452         if (slot->callback_func != NULL) {
 453                 slot->callback_func(slot->callback_data);
 454         }
 455 }
 456
 457 void finish_all_active_slots(void)
 458 {
 459         struct active_request_slot *slot = active_queue_head;
 460
 461         while (slot != NULL)
 462                 if (slot->in_use) {
 463                         run_active_slot(slot);
 464                         slot = active_queue_head;
 465                 } else {
 466                         slot = slot->next;
 467                 }
 468 }