http.c

   1 #include "http.h"
   2
   3 int data_received;
   4 int active_requests = 0;
   5
   6 #ifdef USE_CURL_MULTI
   7 static int max_requests = -1;
   8 static CURLM *curlm;
   9 #endif
  10 #ifndef NO_CURL_EASY_DUPHANDLE
  11 static CURL *curl_default;
  12 #endif
  13 char curl_errorstr[CURL_ERROR_SIZE];
  14
  15 static int curl_ssl_verify = -1;
  16 static char *ssl_cert = NULL;
  17 #if LIBCURL_VERSION_NUM >= 0x070902
  18 static char *ssl_key = NULL;
  19 #endif
  20 #if LIBCURL_VERSION_NUM >= 0x070908
  21 static char *ssl_capath = NULL;
  22 #endif
  23 static char *ssl_cainfo = NULL;
  24 static long curl_low_speed_limit = -1;
  25 static long curl_low_speed_time = -1;
  26 static int curl_ftp_no_epsv = 0;
  27 static char *curl_http_proxy = NULL;
  28
  29 static struct curl_slist *pragma_header;
  30
  31 static struct active_request_slot *active_queue_head = NULL;
  32
  33 size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb,
  34                            struct buffer *buffer)
  35 {
  36         size_t size = eltsize * nmemb;
  37         if (size > buffer->buf.len - buffer->posn)
  38                 size = buffer->buf.len - buffer->posn;
  39         memcpy(ptr, buffer->buf.buf + buffer->posn, size);
  40         buffer->posn += size;
  41
  42         return size;
  43 }
  44
  45 size_t fwrite_buffer(const void *ptr, size_t eltsize,
  46                             size_t nmemb, struct strbuf *buffer)
  47 {
  48         size_t size = eltsize * nmemb;
  49         strbuf_add(buffer, ptr, size);
  50         data_received++;
  51         return size;
  52 }
  53
  54 size_t fwrite_null(const void *ptr, size_t eltsize,
  55                           size_t nmemb, struct strbuf *buffer)
  56 {
  57         data_received++;
  58         return eltsize * nmemb;
  59 }
  60
  61 static void finish_active_slot(struct active_request_slot *slot);
  62
  63 #ifdef USE_CURL_MULTI
  64 static void process_curl_messages(void)
  65 {
  66         int num_messages;
  67         struct active_request_slot *slot;
  68         CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
  69
  70         while (curl_message != NULL) {
  71                 if (curl_message->msg == CURLMSG_DONE) {
  72                         int curl_result = curl_message->data.result;
  73                         slot = active_queue_head;
  74                         while (slot != NULL &&
  75                                slot->curl != curl_message->easy_handle)
  76                                 slot = slot->next;
  77                         if (slot != NULL) {
  78                                 curl_multi_remove_handle(curlm, slot->curl);
  79                                 slot->curl_result = curl_result;
  80                                 finish_active_slot(slot);
  81                         } else {
  82                                 fprintf(stderr, "Received DONE message for unknown request!\n");
  83                         }
  84                 } else {
  85                         fprintf(stderr, "Unknown CURL message received: %d\n",
  86                                 (int)curl_message->msg);
  87                 }
  88                 curl_message = curl_multi_info_read(curlm, &num_messages);
  89         }
  90 }
  91 #endif
  92
  93 static int http_options(const char *var, const char *value, void *cb)
  94 {
  95         if (!strcmp("http.sslverify", var)) {
  96                 if (curl_ssl_verify == -1) {
  97                         curl_ssl_verify = git_config_bool(var, value);
  98                 }
  99                 return 0;
 100         }
 101
 102         if (!strcmp("http.sslcert", var)) {
 103                 if (ssl_cert == NULL) {
 104                         if (!value)
 105                                 return config_error_nonbool(var);
 106                         ssl_cert = xstrdup(value);
 107                 }
 108                 return 0;
 109         }
 110 #if LIBCURL_VERSION_NUM >= 0x070902
 111         if (!strcmp("http.sslkey", var)) {
 112                 if (ssl_key == NULL) {
 113                         if (!value)
 114                                 return config_error_nonbool(var);
 115                         ssl_key = xstrdup(value);
 116                 }
 117                 return 0;
 118         }
 119 #endif
 120 #if LIBCURL_VERSION_NUM >= 0x070908
 121         if (!strcmp("http.sslcapath", var)) {
 122                 if (ssl_capath == NULL) {
 123                         if (!value)
 124                                 return config_error_nonbool(var);
 125                         ssl_capath = xstrdup(value);
 126                 }
 127                 return 0;
 128         }
 129 #endif
 130         if (!strcmp("http.sslcainfo", var)) {
 131                 if (ssl_cainfo == NULL) {
 132                         if (!value)
 133                                 return config_error_nonbool(var);
 134                         ssl_cainfo = xstrdup(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         if (!strcmp("http.noepsv", var)) {
 159                 curl_ftp_no_epsv = git_config_bool(var, value);
 160                 return 0;
 161         }
 162         if (!strcmp("http.proxy", var)) {
 163                 if (curl_http_proxy == NULL) {
 164                         if (!value)
 165                                 return config_error_nonbool(var);
 166                         curl_http_proxy = xstrdup(value);
 167                 }
 168                 return 0;
 169         }
 170
 171         /* Fall back on the default ones */
 172         return git_default_config(var, value, cb);
 173 }
 174
 175 static CURL* get_curl_handle(void)
 176 {
 177         CURL* result = curl_easy_init();
 178
 179         curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
 180 #if LIBCURL_VERSION_NUM >= 0x070907
 181         curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 182 #endif
 183
 184         if (ssl_cert != NULL)
 185                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 186 #if LIBCURL_VERSION_NUM >= 0x070902
 187         if (ssl_key != NULL)
 188                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 189 #endif
 190 #if LIBCURL_VERSION_NUM >= 0x070908
 191         if (ssl_capath != NULL)
 192                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 193 #endif
 194         if (ssl_cainfo != NULL)
 195                 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 196         curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 197
 198         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 199                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 200                                  curl_low_speed_limit);
 201                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 202                                  curl_low_speed_time);
 203         }
 204
 205         curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 206
 207         if (getenv("GIT_CURL_VERBOSE"))
 208                 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 209
 210         curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
 211
 212         if (curl_ftp_no_epsv)
 213                 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 214
 215         if (curl_http_proxy)
 216                 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 217
 218         return result;
 219 }
 220
 221 void http_init(struct remote *remote)
 222 {
 223         char *low_speed_limit;
 224         char *low_speed_time;
 225
 226         curl_global_init(CURL_GLOBAL_ALL);
 227
 228         if (remote && remote->http_proxy)
 229                 curl_http_proxy = xstrdup(remote->http_proxy);
 230
 231         pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 232
 233 #ifdef USE_CURL_MULTI
 234         {
 235                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 236                 if (http_max_requests != NULL)
 237                         max_requests = atoi(http_max_requests);
 238         }
 239
 240         curlm = curl_multi_init();
 241         if (curlm == NULL) {
 242                 fprintf(stderr, "Error creating curl multi handle.\n");
 243                 exit(1);
 244         }
 245 #endif
 246
 247         if (getenv("GIT_SSL_NO_VERIFY"))
 248                 curl_ssl_verify = 0;
 249
 250         ssl_cert = getenv("GIT_SSL_CERT");
 251 #if LIBCURL_VERSION_NUM >= 0x070902
 252         ssl_key = getenv("GIT_SSL_KEY");
 253 #endif
 254 #if LIBCURL_VERSION_NUM >= 0x070908
 255         ssl_capath = getenv("GIT_SSL_CAPATH");
 256 #endif
 257         ssl_cainfo = getenv("GIT_SSL_CAINFO");
 258
 259         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 260         if (low_speed_limit != NULL)
 261                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 262         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 263         if (low_speed_time != NULL)
 264                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 265
 266         git_config(http_options, NULL);
 267
 268         if (curl_ssl_verify == -1)
 269                 curl_ssl_verify = 1;
 270
 271 #ifdef USE_CURL_MULTI
 272         if (max_requests < 1)
 273                 max_requests = DEFAULT_MAX_REQUESTS;
 274 #endif
 275
 276         if (getenv("GIT_CURL_FTP_NO_EPSV"))
 277                 curl_ftp_no_epsv = 1;
 278
 279 #ifndef NO_CURL_EASY_DUPHANDLE
 280         curl_default = get_curl_handle();
 281 #endif
 282 }
 283
 284 void http_cleanup(void)
 285 {
 286         struct active_request_slot *slot = active_queue_head;
 287
 288         while (slot != NULL) {
 289                 struct active_request_slot *next = slot->next;
 290                 if (slot->curl != NULL) {
 291 #ifdef USE_CURL_MULTI
 292                         curl_multi_remove_handle(curlm, slot->curl);
 293 #endif
 294                         curl_easy_cleanup(slot->curl);
 295                 }
 296                 free(slot);
 297                 slot = next;
 298         }
 299         active_queue_head = NULL;
 300
 301 #ifndef NO_CURL_EASY_DUPHANDLE
 302         curl_easy_cleanup(curl_default);
 303 #endif
 304
 305 #ifdef USE_CURL_MULTI
 306         curl_multi_cleanup(curlm);
 307 #endif
 308         curl_global_cleanup();
 309
 310         curl_slist_free_all(pragma_header);
 311         pragma_header = NULL;
 312
 313         if (curl_http_proxy) {
 314                 free(curl_http_proxy);
 315                 curl_http_proxy = NULL;
 316         }
 317 }
 318
 319 struct active_request_slot *get_active_slot(void)
 320 {
 321         struct active_request_slot *slot = active_queue_head;
 322         struct active_request_slot *newslot;
 323
 324 #ifdef USE_CURL_MULTI
 325         int num_transfers;
 326
 327         /* Wait for a slot to open up if the queue is full */
 328         while (active_requests >= max_requests) {
 329                 curl_multi_perform(curlm, &num_transfers);
 330                 if (num_transfers < active_requests) {
 331                         process_curl_messages();
 332                 }
 333         }
 334 #endif
 335
 336         while (slot != NULL && slot->in_use) {
 337                 slot = slot->next;
 338         }
 339         if (slot == NULL) {
 340                 newslot = xmalloc(sizeof(*newslot));
 341                 newslot->curl = NULL;
 342                 newslot->in_use = 0;
 343                 newslot->next = NULL;
 344
 345                 slot = active_queue_head;
 346                 if (slot == NULL) {
 347                         active_queue_head = newslot;
 348                 } else {
 349                         while (slot->next != NULL) {
 350                                 slot = slot->next;
 351                         }
 352                         slot->next = newslot;
 353                 }
 354                 slot = newslot;
 355         }
 356
 357         if (slot->curl == NULL) {
 358 #ifdef NO_CURL_EASY_DUPHANDLE
 359                 slot->curl = get_curl_handle();
 360 #else
 361                 slot->curl = curl_easy_duphandle(curl_default);
 362 #endif
 363         }
 364
 365         active_requests++;
 366         slot->in_use = 1;
 367         slot->local = NULL;
 368         slot->results = NULL;
 369         slot->finished = NULL;
 370         slot->callback_data = NULL;
 371         slot->callback_func = NULL;
 372         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 373         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 374         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 375         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 376         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 377         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 378         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 379
 380         return slot;
 381 }
 382
 383 int start_active_slot(struct active_request_slot *slot)
 384 {
 385 #ifdef USE_CURL_MULTI
 386         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 387         int num_transfers;
 388
 389         if (curlm_result != CURLM_OK &&
 390             curlm_result != CURLM_CALL_MULTI_PERFORM) {
 391                 active_requests--;
 392                 slot->in_use = 0;
 393                 return 0;
 394         }
 395
 396         /*
 397          * We know there must be something to do, since we just added
 398          * something.
 399          */
 400         curl_multi_perform(curlm, &num_transfers);
 401 #endif
 402         return 1;
 403 }
 404
 405 #ifdef USE_CURL_MULTI
 406 struct fill_chain {
 407         void *data;
 408         int (*fill)(void *);
 409         struct fill_chain *next;
 410 };
 411
 412 static struct fill_chain *fill_cfg = NULL;
 413
 414 void add_fill_function(void *data, int (*fill)(void *))
 415 {
 416         struct fill_chain *new = malloc(sizeof(*new));
 417         struct fill_chain **linkp = &fill_cfg;
 418         new->data = data;
 419         new->fill = fill;
 420         new->next = NULL;
 421         while (*linkp)
 422                 linkp = &(*linkp)->next;
 423         *linkp = new;
 424 }
 425
 426 void fill_active_slots(void)
 427 {
 428         struct active_request_slot *slot = active_queue_head;
 429
 430         while (active_requests < max_requests) {
 431                 struct fill_chain *fill;
 432                 for (fill = fill_cfg; fill; fill = fill->next)
 433                         if (fill->fill(fill->data))
 434                                 break;
 435
 436                 if (!fill)
 437                         break;
 438         }
 439
 440         while (slot != NULL) {
 441                 if (!slot->in_use && slot->curl != NULL) {
 442                         curl_easy_cleanup(slot->curl);
 443                         slot->curl = NULL;
 444                 }
 445                 slot = slot->next;
 446         }
 447 }
 448
 449 void step_active_slots(void)
 450 {
 451         int num_transfers;
 452         CURLMcode curlm_result;
 453
 454         do {
 455                 curlm_result = curl_multi_perform(curlm, &num_transfers);
 456         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 457         if (num_transfers < active_requests) {
 458                 process_curl_messages();
 459                 fill_active_slots();
 460         }
 461 }
 462 #endif
 463
 464 void run_active_slot(struct active_request_slot *slot)
 465 {
 466 #ifdef USE_CURL_MULTI
 467         long last_pos = 0;
 468         long current_pos;
 469         fd_set readfds;
 470         fd_set writefds;
 471         fd_set excfds;
 472         int max_fd;
 473         struct timeval select_timeout;
 474         int finished = 0;
 475
 476         slot->finished = &finished;
 477         while (!finished) {
 478                 data_received = 0;
 479                 step_active_slots();
 480
 481                 if (!data_received && slot->local != NULL) {
 482                         current_pos = ftell(slot->local);
 483                         if (current_pos > last_pos)
 484                                 data_received++;
 485                         last_pos = current_pos;
 486                 }
 487
 488                 if (slot->in_use && !data_received) {
 489                         max_fd = 0;
 490                         FD_ZERO(&readfds);
 491                         FD_ZERO(&writefds);
 492                         FD_ZERO(&excfds);
 493                         select_timeout.tv_sec = 0;
 494                         select_timeout.tv_usec = 50000;
 495                         select(max_fd, &readfds, &writefds,
 496                                &excfds, &select_timeout);
 497                 }
 498         }
 499 #else
 500         while (slot->in_use) {
 501                 slot->curl_result = curl_easy_perform(slot->curl);
 502                 finish_active_slot(slot);
 503         }
 504 #endif
 505 }
 506
 507 static void closedown_active_slot(struct active_request_slot *slot)
 508 {
 509         active_requests--;
 510         slot->in_use = 0;
 511 }
 512
 513 void release_active_slot(struct active_request_slot *slot)
 514 {
 515         closedown_active_slot(slot);
 516         if (slot->curl) {
 517 #ifdef USE_CURL_MULTI
 518                 curl_multi_remove_handle(curlm, slot->curl);
 519 #endif
 520                 curl_easy_cleanup(slot->curl);
 521                 slot->curl = NULL;
 522         }
 523 #ifdef USE_CURL_MULTI
 524         fill_active_slots();
 525 #endif
 526 }
 527
 528 static void finish_active_slot(struct active_request_slot *slot)
 529 {
 530         closedown_active_slot(slot);
 531         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 532
 533         if (slot->finished != NULL)
 534                 (*slot->finished) = 1;
 535
 536         /* Store slot results so they can be read after the slot is reused */
 537         if (slot->results != NULL) {
 538                 slot->results->curl_result = slot->curl_result;
 539                 slot->results->http_code = slot->http_code;
 540         }
 541
 542         /* Run callback if appropriate */
 543         if (slot->callback_func != NULL) {
 544                 slot->callback_func(slot->callback_data);
 545         }
 546 }
 547
 548 void finish_all_active_slots(void)
 549 {
 550         struct active_request_slot *slot = active_queue_head;
 551
 552         while (slot != NULL)
 553                 if (slot->in_use) {
 554                         run_active_slot(slot);
 555                         slot = active_queue_head;
 556                 } else {
 557                         slot = slot->next;
 558                 }
 559 }
 560
 561 static inline int needs_quote(int ch)
 562 {
 563         if (((ch >= 'A') && (ch <= 'Z'))
 564                         || ((ch >= 'a') && (ch <= 'z'))
 565                         || ((ch >= '0') && (ch <= '9'))
 566                         || (ch == '/')
 567                         || (ch == '-')
 568                         || (ch == '.'))
 569                 return 0;
 570         return 1;
 571 }
 572
 573 static inline int hex(int v)
 574 {
 575         if (v < 10) return '0' + v;
 576         else return 'A' + v - 10;
 577 }
 578
 579 static char *quote_ref_url(const char *base, const char *ref)
 580 {
 581         const char *cp;
 582         char *dp, *qref;
 583         int len, baselen, ch;
 584
 585         baselen = strlen(base);
 586         len = baselen + 2; /* '/' after base and terminating NUL */
 587         for (cp = ref; (ch = *cp) != 0; cp++, len++)
 588                 if (needs_quote(ch))
 589                         len += 2; /* extra two hex plus replacement % */
 590         qref = xmalloc(len);
 591         memcpy(qref, base, baselen);
 592         dp = qref + baselen;
 593         *(dp++) = '/';
 594         for (cp = ref; (ch = *cp) != 0; cp++) {
 595                 if (needs_quote(ch)) {
 596                         *dp++ = '%';
 597                         *dp++ = hex((ch >> 4) & 0xF);
 598                         *dp++ = hex(ch & 0xF);
 599                 }
 600                 else
 601                         *dp++ = ch;
 602         }
 603         *dp = 0;
 604
 605         return qref;
 606 }
 607
 608 int http_fetch_ref(const char *base, struct ref *ref)
 609 {
 610         char *url;
 611         struct strbuf buffer = STRBUF_INIT;
 612         struct active_request_slot *slot;
 613         struct slot_results results;
 614         int ret;
 615
 616         url = quote_ref_url(base, ref->name);
 617         slot = get_active_slot();
 618         slot->results = &results;
 619         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 620         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 621         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 622         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 623         if (start_active_slot(slot)) {
 624                 run_active_slot(slot);
 625                 if (results.curl_result == CURLE_OK) {
 626                         strbuf_rtrim(&buffer);
 627                         if (buffer.len == 40)
 628                                 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
 629                         else if (!prefixcmp(buffer.buf, "ref: ")) {
 630                                 ref->symref = xstrdup(buffer.buf + 5);
 631                                 ret = 0;
 632                         } else
 633                                 ret = 1;
 634                 } else {
 635                         ret = error("Couldn't get %s for %s\n%s",
 636                                     url, ref->name, curl_errorstr);
 637                 }
 638         } else {
 639                 ret = error("Unable to start request");
 640         }
 641
 642         strbuf_release(&buffer);
 643         free(url);
 644         return ret;
 645 }