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
  29 struct active_request_slot *active_queue_head = NULL;
  30
  31 size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb,
  32                            struct buffer *buffer)
  33 {
  34         size_t size = eltsize * nmemb;
  35         if (size > buffer->size - buffer->posn)
  36                 size = buffer->size - buffer->posn;
  37         memcpy(ptr, (char *) buffer->buffer + buffer->posn, size);
  38         buffer->posn += size;
  39         return size;
  40 }
  41
  42 size_t fwrite_buffer(const void *ptr, size_t eltsize,
  43                             size_t nmemb, struct buffer *buffer)
  44 {
  45         size_t size = eltsize * nmemb;
  46         if (size > buffer->size - buffer->posn) {
  47                 buffer->size = buffer->size * 3 / 2;
  48                 if (buffer->size < buffer->posn + size)
  49                         buffer->size = buffer->posn + size;
  50                 buffer->buffer = xrealloc(buffer->buffer, buffer->size);
  51         }
  52         memcpy((char *) buffer->buffer + buffer->posn, ptr, size);
  53         buffer->posn += size;
  54         data_received++;
  55         return size;
  56 }
  57
  58 size_t fwrite_null(const void *ptr, size_t eltsize,
  59                           size_t nmemb, struct buffer *buffer)
  60 {
  61         data_received++;
  62         return eltsize * nmemb;
  63 }
  64
  65 static void finish_active_slot(struct active_request_slot *slot);
  66
  67 #ifdef USE_CURL_MULTI
  68 static void process_curl_messages(void)
  69 {
  70         int num_messages;
  71         struct active_request_slot *slot;
  72         CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
  73
  74         while (curl_message != NULL) {
  75                 if (curl_message->msg == CURLMSG_DONE) {
  76                         int curl_result = curl_message->data.result;
  77                         slot = active_queue_head;
  78                         while (slot != NULL &&
  79                                slot->curl != curl_message->easy_handle)
  80                                 slot = slot->next;
  81                         if (slot != NULL) {
  82                                 curl_multi_remove_handle(curlm, slot->curl);
  83                                 slot->curl_result = curl_result;
  84                                 finish_active_slot(slot);
  85                         } else {
  86                                 fprintf(stderr, "Received DONE message for unknown request!\n");
  87                         }
  88                 } else {
  89                         fprintf(stderr, "Unknown CURL message received: %d\n",
  90                                 (int)curl_message->msg);
  91                 }
  92                 curl_message = curl_multi_info_read(curlm, &num_messages);
  93         }
  94 }
  95 #endif
  96
  97 static int http_options(const char *var, const char *value)
  98 {
  99         if (!strcmp("http.sslverify", var)) {
 100                 if (curl_ssl_verify == -1) {
 101                         curl_ssl_verify = git_config_bool(var, value);
 102                 }
 103                 return 0;
 104         }
 105
 106         if (!strcmp("http.sslcert", var)) {
 107                 if (ssl_cert == NULL) {
 108                         ssl_cert = xmalloc(strlen(value)+1);
 109                         strcpy(ssl_cert, value);
 110                 }
 111                 return 0;
 112         }
 113 #if LIBCURL_VERSION_NUM >= 0x070902
 114         if (!strcmp("http.sslkey", var)) {
 115                 if (ssl_key == NULL) {
 116                         ssl_key = xmalloc(strlen(value)+1);
 117                         strcpy(ssl_key, value);
 118                 }
 119                 return 0;
 120         }
 121 #endif
 122 #if LIBCURL_VERSION_NUM >= 0x070908
 123         if (!strcmp("http.sslcapath", var)) {
 124                 if (ssl_capath == NULL) {
 125                         ssl_capath = xmalloc(strlen(value)+1);
 126                         strcpy(ssl_capath, value);
 127                 }
 128                 return 0;
 129         }
 130 #endif
 131         if (!strcmp("http.sslcainfo", var)) {
 132                 if (ssl_cainfo == NULL) {
 133                         ssl_cainfo = xmalloc(strlen(value)+1);
 134                         strcpy(ssl_cainfo, value);
 135                 }
 136                 return 0;
 137         }
 138
 139 #ifdef USE_CURL_MULTI
 140         if (!strcmp("http.maxrequests", var)) {
 141                 if (max_requests == -1)
 142                         max_requests = git_config_int(var, value);
 143                 return 0;
 144         }
 145 #endif
 146
 147         if (!strcmp("http.lowspeedlimit", var)) {
 148                 if (curl_low_speed_limit == -1)
 149                         curl_low_speed_limit = (long)git_config_int(var, value);
 150                 return 0;
 151         }
 152         if (!strcmp("http.lowspeedtime", var)) {
 153                 if (curl_low_speed_time == -1)
 154                         curl_low_speed_time = (long)git_config_int(var, value);
 155                 return 0;
 156         }
 157
 158         /* Fall back on the default ones */
 159         return git_default_config(var, value);
 160 }
 161
 162 static CURL* get_curl_handle(void)
 163 {
 164         CURL* result = curl_easy_init();
 165
 166         curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
 167 #if LIBCURL_VERSION_NUM >= 0x070907
 168         curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 169 #endif
 170
 171         if (ssl_cert != NULL)
 172                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 173 #if LIBCURL_VERSION_NUM >= 0x070902
 174         if (ssl_key != NULL)
 175                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 176 #endif
 177 #if LIBCURL_VERSION_NUM >= 0x070908
 178         if (ssl_capath != NULL)
 179                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 180 #endif
 181         if (ssl_cainfo != NULL)
 182                 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 183         curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 184
 185         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 186                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 187                                  curl_low_speed_limit);
 188                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 189                                  curl_low_speed_time);
 190         }
 191
 192         curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 193
 194         if (getenv("GIT_CURL_VERBOSE"))
 195                 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 196
 197         curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
 198
 199         return result;
 200 }
 201
 202 void http_init(void)
 203 {
 204         char *low_speed_limit;
 205         char *low_speed_time;
 206
 207         curl_global_init(CURL_GLOBAL_ALL);
 208
 209         pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 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         curl_slist_free_all(pragma_header);
 291 }
 292
 293 struct active_request_slot *get_active_slot(void)
 294 {
 295         struct active_request_slot *slot = active_queue_head;
 296         struct active_request_slot *newslot;
 297
 298 #ifdef USE_CURL_MULTI
 299         int num_transfers;
 300
 301         /* Wait for a slot to open up if the queue is full */
 302         while (active_requests >= max_requests) {
 303                 curl_multi_perform(curlm, &num_transfers);
 304                 if (num_transfers < active_requests) {
 305                         process_curl_messages();
 306                 }
 307         }
 308 #endif
 309
 310         while (slot != NULL && slot->in_use) {
 311                 slot = slot->next;
 312         }
 313         if (slot == NULL) {
 314                 newslot = xmalloc(sizeof(*newslot));
 315                 newslot->curl = NULL;
 316                 newslot->in_use = 0;
 317                 newslot->next = NULL;
 318
 319                 slot = active_queue_head;
 320                 if (slot == NULL) {
 321                         active_queue_head = newslot;
 322                 } else {
 323                         while (slot->next != NULL) {
 324                                 slot = slot->next;
 325                         }
 326                         slot->next = newslot;
 327                 }
 328                 slot = newslot;
 329         }
 330
 331         if (slot->curl == NULL) {
 332 #ifdef NO_CURL_EASY_DUPHANDLE
 333                 slot->curl = get_curl_handle();
 334 #else
 335                 slot->curl = curl_easy_duphandle(curl_default);
 336 #endif
 337         }
 338
 339         active_requests++;
 340         slot->in_use = 1;
 341         slot->local = NULL;
 342         slot->results = NULL;
 343         slot->finished = NULL;
 344         slot->callback_data = NULL;
 345         slot->callback_func = NULL;
 346         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 347         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 348         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 349         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 350         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 351         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 352         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 353         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 354
 355         return slot;
 356 }
 357
 358 int start_active_slot(struct active_request_slot *slot)
 359 {
 360 #ifdef USE_CURL_MULTI
 361         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 362
 363         if (curlm_result != CURLM_OK &&
 364             curlm_result != CURLM_CALL_MULTI_PERFORM) {
 365                 active_requests--;
 366                 slot->in_use = 0;
 367                 return 0;
 368         }
 369 #endif
 370         return 1;
 371 }
 372
 373 #ifdef USE_CURL_MULTI
 374 void step_active_slots(void)
 375 {
 376         int num_transfers;
 377         CURLMcode curlm_result;
 378
 379         do {
 380                 curlm_result = curl_multi_perform(curlm, &num_transfers);
 381         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 382         if (num_transfers < active_requests) {
 383                 process_curl_messages();
 384                 fill_active_slots();
 385         }
 386 }
 387 #endif
 388
 389 void run_active_slot(struct active_request_slot *slot)
 390 {
 391 #ifdef USE_CURL_MULTI
 392         long last_pos = 0;
 393         long current_pos;
 394         fd_set readfds;
 395         fd_set writefds;
 396         fd_set excfds;
 397         int max_fd;
 398         struct timeval select_timeout;
 399         int finished = 0;
 400
 401         slot->finished = &finished;
 402         while (!finished) {
 403                 data_received = 0;
 404                 step_active_slots();
 405
 406                 if (!data_received && slot->local != NULL) {
 407                         current_pos = ftell(slot->local);
 408                         if (current_pos > last_pos)
 409                                 data_received++;
 410                         last_pos = current_pos;
 411                 }
 412
 413                 if (slot->in_use && !data_received) {
 414                         max_fd = 0;
 415                         FD_ZERO(&readfds);
 416                         FD_ZERO(&writefds);
 417                         FD_ZERO(&excfds);
 418                         select_timeout.tv_sec = 0;
 419                         select_timeout.tv_usec = 50000;
 420                         select(max_fd, &readfds, &writefds,
 421                                &excfds, &select_timeout);
 422                 }
 423         }
 424 #else
 425         while (slot->in_use) {
 426                 slot->curl_result = curl_easy_perform(slot->curl);
 427                 finish_active_slot(slot);
 428         }
 429 #endif
 430 }
 431
 432 static void closedown_active_slot(struct active_request_slot *slot)
 433 {
 434         active_requests--;
 435         slot->in_use = 0;
 436 }
 437
 438 void release_active_slot(struct active_request_slot *slot)
 439 {
 440         closedown_active_slot(slot);
 441         if (slot->curl) {
 442 #ifdef USE_CURL_MULTI
 443                 curl_multi_remove_handle(curlm, slot->curl);
 444 #endif
 445                 curl_easy_cleanup(slot->curl);
 446                 slot->curl = NULL;
 447         }
 448 #ifdef USE_CURL_MULTI
 449         fill_active_slots();
 450 #endif
 451 }
 452
 453 static void finish_active_slot(struct active_request_slot *slot)
 454 {
 455         closedown_active_slot(slot);
 456         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 457
 458         if (slot->finished != NULL)
 459                 (*slot->finished) = 1;
 460
 461         /* Store slot results so they can be read after the slot is reused */
 462         if (slot->results != NULL) {
 463                 slot->results->curl_result = slot->curl_result;
 464                 slot->results->http_code = slot->http_code;
 465         }
 466
 467         /* Run callback if appropriate */
 468         if (slot->callback_func != NULL) {
 469                 slot->callback_func(slot->callback_data);
 470         }
 471 }
 472
 473 void finish_all_active_slots(void)
 474 {
 475         struct active_request_slot *slot = active_queue_head;
 476
 477         while (slot != NULL)
 478                 if (slot->in_use) {
 479                         run_active_slot(slot);
 480                         slot = active_queue_head;
 481                 } else {
 482                         slot = slot->next;
 483                 }
 484 }