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 int curl_ftp_no_epsv = 0;
  27
  28 struct curl_slist *pragma_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, (char *) 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((char *) 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         if (!strcmp("http.noepsv", var)) {
 160                 curl_ftp_no_epsv = git_config_bool(var, value);
 161                 return 0;
 162         }
 163
 164         /* Fall back on the default ones */
 165         return git_default_config(var, value);
 166 }
 167
 168 static CURL* get_curl_handle(void)
 169 {
 170         CURL* result = curl_easy_init();
 171
 172         curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
 173 #if LIBCURL_VERSION_NUM >= 0x070907
 174         curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 175 #endif
 176
 177         if (ssl_cert != NULL)
 178                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 179 #if LIBCURL_VERSION_NUM >= 0x070902
 180         if (ssl_key != NULL)
 181                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 182 #endif
 183 #if LIBCURL_VERSION_NUM >= 0x070908
 184         if (ssl_capath != NULL)
 185                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 186 #endif
 187         if (ssl_cainfo != NULL)
 188                 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 189         curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 190
 191         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 192                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 193                                  curl_low_speed_limit);
 194                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 195                                  curl_low_speed_time);
 196         }
 197
 198         curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 199
 200         if (getenv("GIT_CURL_VERBOSE"))
 201                 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 202
 203         curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
 204
 205         if (curl_ftp_no_epsv)
 206                 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 207
 208         return result;
 209 }
 210
 211 void http_init(void)
 212 {
 213         char *low_speed_limit;
 214         char *low_speed_time;
 215
 216         curl_global_init(CURL_GLOBAL_ALL);
 217
 218         pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 219
 220 #ifdef USE_CURL_MULTI
 221         {
 222                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 223                 if (http_max_requests != NULL)
 224                         max_requests = atoi(http_max_requests);
 225         }
 226
 227         curlm = curl_multi_init();
 228         if (curlm == NULL) {
 229                 fprintf(stderr, "Error creating curl multi handle.\n");
 230                 exit(1);
 231         }
 232 #endif
 233
 234         if (getenv("GIT_SSL_NO_VERIFY"))
 235                 curl_ssl_verify = 0;
 236
 237         ssl_cert = getenv("GIT_SSL_CERT");
 238 #if LIBCURL_VERSION_NUM >= 0x070902
 239         ssl_key = getenv("GIT_SSL_KEY");
 240 #endif
 241 #if LIBCURL_VERSION_NUM >= 0x070908
 242         ssl_capath = getenv("GIT_SSL_CAPATH");
 243 #endif
 244         ssl_cainfo = getenv("GIT_SSL_CAINFO");
 245
 246         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 247         if (low_speed_limit != NULL)
 248                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 249         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 250         if (low_speed_time != NULL)
 251                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 252
 253         git_config(http_options);
 254
 255         if (curl_ssl_verify == -1)
 256                 curl_ssl_verify = 1;
 257
 258 #ifdef USE_CURL_MULTI
 259         if (max_requests < 1)
 260                 max_requests = DEFAULT_MAX_REQUESTS;
 261 #endif
 262
 263         if (getenv("GIT_CURL_FTP_NO_EPSV"))
 264                 curl_ftp_no_epsv = 1;
 265
 266 #ifndef NO_CURL_EASY_DUPHANDLE
 267         curl_default = get_curl_handle();
 268 #endif
 269 }
 270
 271 void http_cleanup(void)
 272 {
 273         struct active_request_slot *slot = active_queue_head;
 274 #ifdef USE_CURL_MULTI
 275         char *wait_url;
 276 #endif
 277
 278         while (slot != NULL) {
 279                 struct active_request_slot *next = slot->next;
 280 #ifdef USE_CURL_MULTI
 281                 if (slot->in_use) {
 282                         curl_easy_getinfo(slot->curl,
 283                                           CURLINFO_EFFECTIVE_URL,
 284                                           &wait_url);
 285                         fprintf(stderr, "Waiting for %s\n", wait_url);
 286                         run_active_slot(slot);
 287                 }
 288 #endif
 289                 if (slot->curl != NULL)
 290                         curl_easy_cleanup(slot->curl);
 291                 free(slot);
 292                 slot = next;
 293         }
 294         active_queue_head = NULL;
 295
 296 #ifndef NO_CURL_EASY_DUPHANDLE
 297         curl_easy_cleanup(curl_default);
 298 #endif
 299
 300 #ifdef USE_CURL_MULTI
 301         curl_multi_cleanup(curlm);
 302 #endif
 303         curl_global_cleanup();
 304
 305         curl_slist_free_all(pragma_header);
 306         pragma_header = NULL;
 307 }
 308
 309 struct active_request_slot *get_active_slot(void)
 310 {
 311         struct active_request_slot *slot = active_queue_head;
 312         struct active_request_slot *newslot;
 313
 314 #ifdef USE_CURL_MULTI
 315         int num_transfers;
 316
 317         /* Wait for a slot to open up if the queue is full */
 318         while (active_requests >= max_requests) {
 319                 curl_multi_perform(curlm, &num_transfers);
 320                 if (num_transfers < active_requests) {
 321                         process_curl_messages();
 322                 }
 323         }
 324 #endif
 325
 326         while (slot != NULL && slot->in_use) {
 327                 slot = slot->next;
 328         }
 329         if (slot == NULL) {
 330                 newslot = xmalloc(sizeof(*newslot));
 331                 newslot->curl = NULL;
 332                 newslot->in_use = 0;
 333                 newslot->next = NULL;
 334
 335                 slot = active_queue_head;
 336                 if (slot == NULL) {
 337                         active_queue_head = newslot;
 338                 } else {
 339                         while (slot->next != NULL) {
 340                                 slot = slot->next;
 341                         }
 342                         slot->next = newslot;
 343                 }
 344                 slot = newslot;
 345         }
 346
 347         if (slot->curl == NULL) {
 348 #ifdef NO_CURL_EASY_DUPHANDLE
 349                 slot->curl = get_curl_handle();
 350 #else
 351                 slot->curl = curl_easy_duphandle(curl_default);
 352 #endif
 353         }
 354
 355         active_requests++;
 356         slot->in_use = 1;
 357         slot->local = NULL;
 358         slot->results = NULL;
 359         slot->finished = NULL;
 360         slot->callback_data = NULL;
 361         slot->callback_func = NULL;
 362         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 363         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 364         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 365         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 366         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 367         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 368         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 369         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 370
 371         return slot;
 372 }
 373
 374 int start_active_slot(struct active_request_slot *slot)
 375 {
 376 #ifdef USE_CURL_MULTI
 377         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 378         int num_transfers;
 379
 380         if (curlm_result != CURLM_OK &&
 381             curlm_result != CURLM_CALL_MULTI_PERFORM) {
 382                 active_requests--;
 383                 slot->in_use = 0;
 384                 return 0;
 385         }
 386
 387         /*
 388          * We know there must be something to do, since we just added
 389          * something.
 390          */
 391         curl_multi_perform(curlm, &num_transfers);
 392 #endif
 393         return 1;
 394 }
 395
 396 #ifdef USE_CURL_MULTI
 397 struct fill_chain {
 398         void *data;
 399         int (*fill)(void *);
 400         struct fill_chain *next;
 401 };
 402
 403 static struct fill_chain *fill_cfg = NULL;
 404
 405 void add_fill_function(void *data, int (*fill)(void *))
 406 {
 407         struct fill_chain *new = malloc(sizeof(*new));
 408         struct fill_chain **linkp = &fill_cfg;
 409         new->data = data;
 410         new->fill = fill;
 411         new->next = NULL;
 412         while (*linkp)
 413                 linkp = &(*linkp)->next;
 414         *linkp = new;
 415 }
 416
 417 void fill_active_slots(void)
 418 {
 419         struct active_request_slot *slot = active_queue_head;
 420
 421         while (active_requests < max_requests) {
 422                 struct fill_chain *fill;
 423                 for (fill = fill_cfg; fill; fill = fill->next)
 424                         if (fill->fill(fill->data))
 425                                 break;
 426
 427                 if (!fill)
 428                         break;
 429         }
 430
 431         while (slot != NULL) {
 432                 if (!slot->in_use && slot->curl != NULL) {
 433                         curl_easy_cleanup(slot->curl);
 434                         slot->curl = NULL;
 435                 }
 436                 slot = slot->next;
 437         }
 438 }
 439
 440 void step_active_slots(void)
 441 {
 442         int num_transfers;
 443         CURLMcode curlm_result;
 444
 445         do {
 446                 curlm_result = curl_multi_perform(curlm, &num_transfers);
 447         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 448         if (num_transfers < active_requests) {
 449                 process_curl_messages();
 450                 fill_active_slots();
 451         }
 452 }
 453 #endif
 454
 455 void run_active_slot(struct active_request_slot *slot)
 456 {
 457 #ifdef USE_CURL_MULTI
 458         long last_pos = 0;
 459         long current_pos;
 460         fd_set readfds;
 461         fd_set writefds;
 462         fd_set excfds;
 463         int max_fd;
 464         struct timeval select_timeout;
 465         int finished = 0;
 466
 467         slot->finished = &finished;
 468         while (!finished) {
 469                 data_received = 0;
 470                 step_active_slots();
 471
 472                 if (!data_received && slot->local != NULL) {
 473                         current_pos = ftell(slot->local);
 474                         if (current_pos > last_pos)
 475                                 data_received++;
 476                         last_pos = current_pos;
 477                 }
 478
 479                 if (slot->in_use && !data_received) {
 480                         max_fd = 0;
 481                         FD_ZERO(&readfds);
 482                         FD_ZERO(&writefds);
 483                         FD_ZERO(&excfds);
 484                         select_timeout.tv_sec = 0;
 485                         select_timeout.tv_usec = 50000;
 486                         select(max_fd, &readfds, &writefds,
 487                                &excfds, &select_timeout);
 488                 }
 489         }
 490 #else
 491         while (slot->in_use) {
 492                 slot->curl_result = curl_easy_perform(slot->curl);
 493                 finish_active_slot(slot);
 494         }
 495 #endif
 496 }
 497
 498 static void closedown_active_slot(struct active_request_slot *slot)
 499 {
 500         active_requests--;
 501         slot->in_use = 0;
 502 }
 503
 504 void release_active_slot(struct active_request_slot *slot)
 505 {
 506         closedown_active_slot(slot);
 507         if (slot->curl) {
 508 #ifdef USE_CURL_MULTI
 509                 curl_multi_remove_handle(curlm, slot->curl);
 510 #endif
 511                 curl_easy_cleanup(slot->curl);
 512                 slot->curl = NULL;
 513         }
 514 #ifdef USE_CURL_MULTI
 515         fill_active_slots();
 516 #endif
 517 }
 518
 519 static void finish_active_slot(struct active_request_slot *slot)
 520 {
 521         closedown_active_slot(slot);
 522         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 523
 524         if (slot->finished != NULL)
 525                 (*slot->finished) = 1;
 526
 527         /* Store slot results so they can be read after the slot is reused */
 528         if (slot->results != NULL) {
 529                 slot->results->curl_result = slot->curl_result;
 530                 slot->results->http_code = slot->http_code;
 531         }
 532
 533         /* Run callback if appropriate */
 534         if (slot->callback_func != NULL) {
 535                 slot->callback_func(slot->callback_data);
 536         }
 537 }
 538
 539 void finish_all_active_slots(void)
 540 {
 541         struct active_request_slot *slot = active_queue_head;
 542
 543         while (slot != NULL)
 544                 if (slot->in_use) {
 545                         run_active_slot(slot);
 546                         slot = active_queue_head;
 547                 } else {
 548                         slot = slot->next;
 549                 }
 550 }