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)
  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);
 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(void)
 222 {
 223         char *low_speed_limit;
 224         char *low_speed_time;
 225
 226         curl_global_init(CURL_GLOBAL_ALL);
 227
 228         pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 229
 230 #ifdef USE_CURL_MULTI
 231         {
 232                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 233                 if (http_max_requests != NULL)
 234                         max_requests = atoi(http_max_requests);
 235         }
 236
 237         curlm = curl_multi_init();
 238         if (curlm == NULL) {
 239                 fprintf(stderr, "Error creating curl multi handle.\n");
 240                 exit(1);
 241         }
 242 #endif
 243
 244         if (getenv("GIT_SSL_NO_VERIFY"))
 245                 curl_ssl_verify = 0;
 246
 247         ssl_cert = getenv("GIT_SSL_CERT");
 248 #if LIBCURL_VERSION_NUM >= 0x070902
 249         ssl_key = getenv("GIT_SSL_KEY");
 250 #endif
 251 #if LIBCURL_VERSION_NUM >= 0x070908
 252         ssl_capath = getenv("GIT_SSL_CAPATH");
 253 #endif
 254         ssl_cainfo = getenv("GIT_SSL_CAINFO");
 255
 256         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 257         if (low_speed_limit != NULL)
 258                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 259         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 260         if (low_speed_time != NULL)
 261                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 262
 263         git_config(http_options);
 264
 265         if (curl_ssl_verify == -1)
 266                 curl_ssl_verify = 1;
 267
 268 #ifdef USE_CURL_MULTI
 269         if (max_requests < 1)
 270                 max_requests = DEFAULT_MAX_REQUESTS;
 271 #endif
 272
 273         if (getenv("GIT_CURL_FTP_NO_EPSV"))
 274                 curl_ftp_no_epsv = 1;
 275
 276 #ifndef NO_CURL_EASY_DUPHANDLE
 277         curl_default = get_curl_handle();
 278 #endif
 279 }
 280
 281 void http_cleanup(void)
 282 {
 283         struct active_request_slot *slot = active_queue_head;
 284
 285         while (slot != NULL) {
 286                 struct active_request_slot *next = slot->next;
 287                 if (slot->curl != NULL) {
 288 #ifdef USE_CURL_MULTI
 289                         curl_multi_remove_handle(curlm, slot->curl);
 290 #endif
 291                         curl_easy_cleanup(slot->curl);
 292                 }
 293                 free(slot);
 294                 slot = next;
 295         }
 296         active_queue_head = NULL;
 297
 298 #ifndef NO_CURL_EASY_DUPHANDLE
 299         curl_easy_cleanup(curl_default);
 300 #endif
 301
 302 #ifdef USE_CURL_MULTI
 303         curl_multi_cleanup(curlm);
 304 #endif
 305         curl_global_cleanup();
 306
 307         curl_slist_free_all(pragma_header);
 308         pragma_header = NULL;
 309 }
 310
 311 struct active_request_slot *get_active_slot(void)
 312 {
 313         struct active_request_slot *slot = active_queue_head;
 314         struct active_request_slot *newslot;
 315
 316 #ifdef USE_CURL_MULTI
 317         int num_transfers;
 318
 319         /* Wait for a slot to open up if the queue is full */
 320         while (active_requests >= max_requests) {
 321                 curl_multi_perform(curlm, &num_transfers);
 322                 if (num_transfers < active_requests) {
 323                         process_curl_messages();
 324                 }
 325         }
 326 #endif
 327
 328         while (slot != NULL && slot->in_use) {
 329                 slot = slot->next;
 330         }
 331         if (slot == NULL) {
 332                 newslot = xmalloc(sizeof(*newslot));
 333                 newslot->curl = NULL;
 334                 newslot->in_use = 0;
 335                 newslot->next = NULL;
 336
 337                 slot = active_queue_head;
 338                 if (slot == NULL) {
 339                         active_queue_head = newslot;
 340                 } else {
 341                         while (slot->next != NULL) {
 342                                 slot = slot->next;
 343                         }
 344                         slot->next = newslot;
 345                 }
 346                 slot = newslot;
 347         }
 348
 349         if (slot->curl == NULL) {
 350 #ifdef NO_CURL_EASY_DUPHANDLE
 351                 slot->curl = get_curl_handle();
 352 #else
 353                 slot->curl = curl_easy_duphandle(curl_default);
 354 #endif
 355         }
 356
 357         active_requests++;
 358         slot->in_use = 1;
 359         slot->local = NULL;
 360         slot->results = NULL;
 361         slot->finished = NULL;
 362         slot->callback_data = NULL;
 363         slot->callback_func = NULL;
 364         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 365         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 366         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 367         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 368         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 369         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 370         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 371
 372         return slot;
 373 }
 374
 375 int start_active_slot(struct active_request_slot *slot)
 376 {
 377 #ifdef USE_CURL_MULTI
 378         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 379         int num_transfers;
 380
 381         if (curlm_result != CURLM_OK &&
 382             curlm_result != CURLM_CALL_MULTI_PERFORM) {
 383                 active_requests--;
 384                 slot->in_use = 0;
 385                 return 0;
 386         }
 387
 388         /*
 389          * We know there must be something to do, since we just added
 390          * something.
 391          */
 392         curl_multi_perform(curlm, &num_transfers);
 393 #endif
 394         return 1;
 395 }
 396
 397 #ifdef USE_CURL_MULTI
 398 struct fill_chain {
 399         void *data;
 400         int (*fill)(void *);
 401         struct fill_chain *next;
 402 };
 403
 404 static struct fill_chain *fill_cfg = NULL;
 405
 406 void add_fill_function(void *data, int (*fill)(void *))
 407 {
 408         struct fill_chain *new = malloc(sizeof(*new));
 409         struct fill_chain **linkp = &fill_cfg;
 410         new->data = data;
 411         new->fill = fill;
 412         new->next = NULL;
 413         while (*linkp)
 414                 linkp = &(*linkp)->next;
 415         *linkp = new;
 416 }
 417
 418 void fill_active_slots(void)
 419 {
 420         struct active_request_slot *slot = active_queue_head;
 421
 422         while (active_requests < max_requests) {
 423                 struct fill_chain *fill;
 424                 for (fill = fill_cfg; fill; fill = fill->next)
 425                         if (fill->fill(fill->data))
 426                                 break;
 427
 428                 if (!fill)
 429                         break;
 430         }
 431
 432         while (slot != NULL) {
 433                 if (!slot->in_use && slot->curl != NULL) {
 434                         curl_easy_cleanup(slot->curl);
 435                         slot->curl = NULL;
 436                 }
 437                 slot = slot->next;
 438         }
 439 }
 440
 441 void step_active_slots(void)
 442 {
 443         int num_transfers;
 444         CURLMcode curlm_result;
 445
 446         do {
 447                 curlm_result = curl_multi_perform(curlm, &num_transfers);
 448         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 449         if (num_transfers < active_requests) {
 450                 process_curl_messages();
 451                 fill_active_slots();
 452         }
 453 }
 454 #endif
 455
 456 void run_active_slot(struct active_request_slot *slot)
 457 {
 458 #ifdef USE_CURL_MULTI
 459         long last_pos = 0;
 460         long current_pos;
 461         fd_set readfds;
 462         fd_set writefds;
 463         fd_set excfds;
 464         int max_fd;
 465         struct timeval select_timeout;
 466         int finished = 0;
 467
 468         slot->finished = &finished;
 469         while (!finished) {
 470                 data_received = 0;
 471                 step_active_slots();
 472
 473                 if (!data_received && slot->local != NULL) {
 474                         current_pos = ftell(slot->local);
 475                         if (current_pos > last_pos)
 476                                 data_received++;
 477                         last_pos = current_pos;
 478                 }
 479
 480                 if (slot->in_use && !data_received) {
 481                         max_fd = 0;
 482                         FD_ZERO(&readfds);
 483                         FD_ZERO(&writefds);
 484                         FD_ZERO(&excfds);
 485                         select_timeout.tv_sec = 0;
 486                         select_timeout.tv_usec = 50000;
 487                         select(max_fd, &readfds, &writefds,
 488                                &excfds, &select_timeout);
 489                 }
 490         }
 491 #else
 492         while (slot->in_use) {
 493                 slot->curl_result = curl_easy_perform(slot->curl);
 494                 finish_active_slot(slot);
 495         }
 496 #endif
 497 }
 498
 499 static void closedown_active_slot(struct active_request_slot *slot)
 500 {
 501         active_requests--;
 502         slot->in_use = 0;
 503 }
 504
 505 void release_active_slot(struct active_request_slot *slot)
 506 {
 507         closedown_active_slot(slot);
 508         if (slot->curl) {
 509 #ifdef USE_CURL_MULTI
 510                 curl_multi_remove_handle(curlm, slot->curl);
 511 #endif
 512                 curl_easy_cleanup(slot->curl);
 513                 slot->curl = NULL;
 514         }
 515 #ifdef USE_CURL_MULTI
 516         fill_active_slots();
 517 #endif
 518 }
 519
 520 static void finish_active_slot(struct active_request_slot *slot)
 521 {
 522         closedown_active_slot(slot);
 523         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 524
 525         if (slot->finished != NULL)
 526                 (*slot->finished) = 1;
 527
 528         /* Store slot results so they can be read after the slot is reused */
 529         if (slot->results != NULL) {
 530                 slot->results->curl_result = slot->curl_result;
 531                 slot->results->http_code = slot->http_code;
 532         }
 533
 534         /* Run callback if appropriate */
 535         if (slot->callback_func != NULL) {
 536                 slot->callback_func(slot->callback_data);
 537         }
 538 }
 539
 540 void finish_all_active_slots(void)
 541 {
 542         struct active_request_slot *slot = active_queue_head;
 543
 544         while (slot != NULL)
 545                 if (slot->in_use) {
 546                         run_active_slot(slot);
 547                         slot = active_queue_head;
 548                 } else {
 549                         slot = slot->next;
 550                 }
 551 }
 552
 553 static inline int needs_quote(int ch)
 554 {
 555         if (((ch >= 'A') && (ch <= 'Z'))
 556                         || ((ch >= 'a') && (ch <= 'z'))
 557                         || ((ch >= '0') && (ch <= '9'))
 558                         || (ch == '/')
 559                         || (ch == '-')
 560                         || (ch == '.'))
 561                 return 0;
 562         return 1;
 563 }
 564
 565 static inline int hex(int v)
 566 {
 567         if (v < 10) return '0' + v;
 568         else return 'A' + v - 10;
 569 }
 570
 571 static char *quote_ref_url(const char *base, const char *ref)
 572 {
 573         const char *cp;
 574         char *dp, *qref;
 575         int len, baselen, ch;
 576
 577         baselen = strlen(base);
 578         len = baselen + 7; /* "/refs/" + NUL */
 579         for (cp = ref; (ch = *cp) != 0; cp++, len++)
 580                 if (needs_quote(ch))
 581                         len += 2; /* extra two hex plus replacement % */
 582         qref = xmalloc(len);
 583         memcpy(qref, base, baselen);
 584         memcpy(qref + baselen, "/refs/", 6);
 585         for (cp = ref, dp = qref + baselen + 6; (ch = *cp) != 0; cp++) {
 586                 if (needs_quote(ch)) {
 587                         *dp++ = '%';
 588                         *dp++ = hex((ch >> 4) & 0xF);
 589                         *dp++ = hex(ch & 0xF);
 590                 }
 591                 else
 592                         *dp++ = ch;
 593         }
 594         *dp = 0;
 595
 596         return qref;
 597 }
 598
 599 int http_fetch_ref(const char *base, const char *ref, unsigned char *sha1)
 600 {
 601         char *url;
 602         struct strbuf buffer = STRBUF_INIT;
 603         struct active_request_slot *slot;
 604         struct slot_results results;
 605         int ret;
 606
 607         url = quote_ref_url(base, ref);
 608         slot = get_active_slot();
 609         slot->results = &results;
 610         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 611         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 612         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 613         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 614         if (start_active_slot(slot)) {
 615                 run_active_slot(slot);
 616                 if (results.curl_result == CURLE_OK) {
 617                         strbuf_rtrim(&buffer);
 618                         if (buffer.len == 40)
 619                                 ret = get_sha1_hex(buffer.buf, sha1);
 620                         else
 621                                 ret = 1;
 622                 } else {
 623                         ret = error("Couldn't get %s for %s\n%s",
 624                                     url, ref, curl_errorstr);
 625                 }
 626         } else {
 627                 ret = error("Unable to start request");
 628         }
 629
 630         strbuf_release(&buffer);
 631         free(url);
 632         return ret;
 633 }