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, void *buffer_)
  34 {
  35         size_t size = eltsize * nmemb;
  36         struct buffer *buffer = buffer_;
  37
  38         if (size > buffer->buf.len - buffer->posn)
  39                 size = buffer->buf.len - buffer->posn;
  40         memcpy(ptr, buffer->buf.buf + buffer->posn, size);
  41         buffer->posn += size;
  42
  43         return size;
  44 }
  45
  46 size_t fwrite_buffer(const void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  47 {
  48         size_t size = eltsize * nmemb;
  49         struct strbuf *buffer = buffer_;
  50
  51         strbuf_add(buffer, ptr, size);
  52         data_received++;
  53         return size;
  54 }
  55
  56 size_t fwrite_null(const void *ptr, size_t eltsize, size_t nmemb, void *strbuf)
  57 {
  58         data_received++;
  59         return eltsize * nmemb;
  60 }
  61
  62 static void finish_active_slot(struct active_request_slot *slot);
  63
  64 #ifdef USE_CURL_MULTI
  65 static void process_curl_messages(void)
  66 {
  67         int num_messages;
  68         struct active_request_slot *slot;
  69         CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
  70
  71         while (curl_message != NULL) {
  72                 if (curl_message->msg == CURLMSG_DONE) {
  73                         int curl_result = curl_message->data.result;
  74                         slot = active_queue_head;
  75                         while (slot != NULL &&
  76                                slot->curl != curl_message->easy_handle)
  77                                 slot = slot->next;
  78                         if (slot != NULL) {
  79                                 curl_multi_remove_handle(curlm, slot->curl);
  80                                 slot->curl_result = curl_result;
  81                                 finish_active_slot(slot);
  82                         } else {
  83                                 fprintf(stderr, "Received DONE message for unknown request!\n");
  84                         }
  85                 } else {
  86                         fprintf(stderr, "Unknown CURL message received: %d\n",
  87                                 (int)curl_message->msg);
  88                 }
  89                 curl_message = curl_multi_info_read(curlm, &num_messages);
  90         }
  91 }
  92 #endif
  93
  94 static int http_options(const char *var, const char *value, void *cb)
  95 {
  96         if (!strcmp("http.sslverify", var)) {
  97                 if (curl_ssl_verify == -1) {
  98                         curl_ssl_verify = git_config_bool(var, value);
  99                 }
 100                 return 0;
 101         }
 102
 103         if (!strcmp("http.sslcert", var)) {
 104                 if (ssl_cert == NULL) {
 105                         if (!value)
 106                                 return config_error_nonbool(var);
 107                         ssl_cert = xstrdup(value);
 108                 }
 109                 return 0;
 110         }
 111 #if LIBCURL_VERSION_NUM >= 0x070902
 112         if (!strcmp("http.sslkey", var)) {
 113                 if (ssl_key == NULL) {
 114                         if (!value)
 115                                 return config_error_nonbool(var);
 116                         ssl_key = xstrdup(value);
 117                 }
 118                 return 0;
 119         }
 120 #endif
 121 #if LIBCURL_VERSION_NUM >= 0x070908
 122         if (!strcmp("http.sslcapath", var)) {
 123                 if (ssl_capath == NULL) {
 124                         if (!value)
 125                                 return config_error_nonbool(var);
 126                         ssl_capath = xstrdup(value);
 127                 }
 128                 return 0;
 129         }
 130 #endif
 131         if (!strcmp("http.sslcainfo", var)) {
 132                 if (ssl_cainfo == NULL) {
 133                         if (!value)
 134                                 return config_error_nonbool(var);
 135                         ssl_cainfo = xstrdup(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         if (!strcmp("http.proxy", var)) {
 164                 if (curl_http_proxy == NULL) {
 165                         if (!value)
 166                                 return config_error_nonbool(var);
 167                         curl_http_proxy = xstrdup(value);
 168                 }
 169                 return 0;
 170         }
 171
 172         /* Fall back on the default ones */
 173         return git_default_config(var, value, cb);
 174 }
 175
 176 static CURL* get_curl_handle(void)
 177 {
 178         CURL* result = curl_easy_init();
 179
 180         curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
 181 #if LIBCURL_VERSION_NUM >= 0x070907
 182         curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 183 #endif
 184
 185         if (ssl_cert != NULL)
 186                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 187 #if LIBCURL_VERSION_NUM >= 0x070902
 188         if (ssl_key != NULL)
 189                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 190 #endif
 191 #if LIBCURL_VERSION_NUM >= 0x070908
 192         if (ssl_capath != NULL)
 193                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 194 #endif
 195         if (ssl_cainfo != NULL)
 196                 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 197         curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 198
 199         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 200                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 201                                  curl_low_speed_limit);
 202                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 203                                  curl_low_speed_time);
 204         }
 205
 206         curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 207
 208         if (getenv("GIT_CURL_VERBOSE"))
 209                 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 210
 211         curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
 212
 213         if (curl_ftp_no_epsv)
 214                 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 215
 216         if (curl_http_proxy)
 217                 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 218
 219         return result;
 220 }
 221
 222 void http_init(struct remote *remote)
 223 {
 224         char *low_speed_limit;
 225         char *low_speed_time;
 226
 227         curl_global_init(CURL_GLOBAL_ALL);
 228
 229         if (remote && remote->http_proxy)
 230                 curl_http_proxy = xstrdup(remote->http_proxy);
 231
 232         pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 233
 234 #ifdef USE_CURL_MULTI
 235         {
 236                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 237                 if (http_max_requests != NULL)
 238                         max_requests = atoi(http_max_requests);
 239         }
 240
 241         curlm = curl_multi_init();
 242         if (curlm == NULL) {
 243                 fprintf(stderr, "Error creating curl multi handle.\n");
 244                 exit(1);
 245         }
 246 #endif
 247
 248         if (getenv("GIT_SSL_NO_VERIFY"))
 249                 curl_ssl_verify = 0;
 250
 251         ssl_cert = getenv("GIT_SSL_CERT");
 252 #if LIBCURL_VERSION_NUM >= 0x070902
 253         ssl_key = getenv("GIT_SSL_KEY");
 254 #endif
 255 #if LIBCURL_VERSION_NUM >= 0x070908
 256         ssl_capath = getenv("GIT_SSL_CAPATH");
 257 #endif
 258         ssl_cainfo = getenv("GIT_SSL_CAINFO");
 259
 260         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 261         if (low_speed_limit != NULL)
 262                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 263         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 264         if (low_speed_time != NULL)
 265                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 266
 267         git_config(http_options, NULL);
 268
 269         if (curl_ssl_verify == -1)
 270                 curl_ssl_verify = 1;
 271
 272 #ifdef USE_CURL_MULTI
 273         if (max_requests < 1)
 274                 max_requests = DEFAULT_MAX_REQUESTS;
 275 #endif
 276
 277         if (getenv("GIT_CURL_FTP_NO_EPSV"))
 278                 curl_ftp_no_epsv = 1;
 279
 280 #ifndef NO_CURL_EASY_DUPHANDLE
 281         curl_default = get_curl_handle();
 282 #endif
 283 }
 284
 285 void http_cleanup(void)
 286 {
 287         struct active_request_slot *slot = active_queue_head;
 288
 289         while (slot != NULL) {
 290                 struct active_request_slot *next = slot->next;
 291                 if (slot->curl != NULL) {
 292 #ifdef USE_CURL_MULTI
 293                         curl_multi_remove_handle(curlm, slot->curl);
 294 #endif
 295                         curl_easy_cleanup(slot->curl);
 296                 }
 297                 free(slot);
 298                 slot = next;
 299         }
 300         active_queue_head = NULL;
 301
 302 #ifndef NO_CURL_EASY_DUPHANDLE
 303         curl_easy_cleanup(curl_default);
 304 #endif
 305
 306 #ifdef USE_CURL_MULTI
 307         curl_multi_cleanup(curlm);
 308 #endif
 309         curl_global_cleanup();
 310
 311         curl_slist_free_all(pragma_header);
 312         pragma_header = NULL;
 313
 314         if (curl_http_proxy) {
 315                 free(curl_http_proxy);
 316                 curl_http_proxy = NULL;
 317         }
 318 }
 319
 320 struct active_request_slot *get_active_slot(void)
 321 {
 322         struct active_request_slot *slot = active_queue_head;
 323         struct active_request_slot *newslot;
 324
 325 #ifdef USE_CURL_MULTI
 326         int num_transfers;
 327
 328         /* Wait for a slot to open up if the queue is full */
 329         while (active_requests >= max_requests) {
 330                 curl_multi_perform(curlm, &num_transfers);
 331                 if (num_transfers < active_requests) {
 332                         process_curl_messages();
 333                 }
 334         }
 335 #endif
 336
 337         while (slot != NULL && slot->in_use) {
 338                 slot = slot->next;
 339         }
 340         if (slot == NULL) {
 341                 newslot = xmalloc(sizeof(*newslot));
 342                 newslot->curl = NULL;
 343                 newslot->in_use = 0;
 344                 newslot->next = NULL;
 345
 346                 slot = active_queue_head;
 347                 if (slot == NULL) {
 348                         active_queue_head = newslot;
 349                 } else {
 350                         while (slot->next != NULL) {
 351                                 slot = slot->next;
 352                         }
 353                         slot->next = newslot;
 354                 }
 355                 slot = newslot;
 356         }
 357
 358         if (slot->curl == NULL) {
 359 #ifdef NO_CURL_EASY_DUPHANDLE
 360                 slot->curl = get_curl_handle();
 361 #else
 362                 slot->curl = curl_easy_duphandle(curl_default);
 363 #endif
 364         }
 365
 366         active_requests++;
 367         slot->in_use = 1;
 368         slot->local = NULL;
 369         slot->results = NULL;
 370         slot->finished = NULL;
 371         slot->callback_data = NULL;
 372         slot->callback_func = NULL;
 373         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 374         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 375         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 376         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 377         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 378         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 379         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 380
 381         return slot;
 382 }
 383
 384 int start_active_slot(struct active_request_slot *slot)
 385 {
 386 #ifdef USE_CURL_MULTI
 387         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 388         int num_transfers;
 389
 390         if (curlm_result != CURLM_OK &&
 391             curlm_result != CURLM_CALL_MULTI_PERFORM) {
 392                 active_requests--;
 393                 slot->in_use = 0;
 394                 return 0;
 395         }
 396
 397         /*
 398          * We know there must be something to do, since we just added
 399          * something.
 400          */
 401         curl_multi_perform(curlm, &num_transfers);
 402 #endif
 403         return 1;
 404 }
 405
 406 #ifdef USE_CURL_MULTI
 407 struct fill_chain {
 408         void *data;
 409         int (*fill)(void *);
 410         struct fill_chain *next;
 411 };
 412
 413 static struct fill_chain *fill_cfg = NULL;
 414
 415 void add_fill_function(void *data, int (*fill)(void *))
 416 {
 417         struct fill_chain *new = malloc(sizeof(*new));
 418         struct fill_chain **linkp = &fill_cfg;
 419         new->data = data;
 420         new->fill = fill;
 421         new->next = NULL;
 422         while (*linkp)
 423                 linkp = &(*linkp)->next;
 424         *linkp = new;
 425 }
 426
 427 void fill_active_slots(void)
 428 {
 429         struct active_request_slot *slot = active_queue_head;
 430
 431         while (active_requests < max_requests) {
 432                 struct fill_chain *fill;
 433                 for (fill = fill_cfg; fill; fill = fill->next)
 434                         if (fill->fill(fill->data))
 435                                 break;
 436
 437                 if (!fill)
 438                         break;
 439         }
 440
 441         while (slot != NULL) {
 442                 if (!slot->in_use && slot->curl != NULL) {
 443                         curl_easy_cleanup(slot->curl);
 444                         slot->curl = NULL;
 445                 }
 446                 slot = slot->next;
 447         }
 448 }
 449
 450 void step_active_slots(void)
 451 {
 452         int num_transfers;
 453         CURLMcode curlm_result;
 454
 455         do {
 456                 curlm_result = curl_multi_perform(curlm, &num_transfers);
 457         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 458         if (num_transfers < active_requests) {
 459                 process_curl_messages();
 460                 fill_active_slots();
 461         }
 462 }
 463 #endif
 464
 465 void run_active_slot(struct active_request_slot *slot)
 466 {
 467 #ifdef USE_CURL_MULTI
 468         long last_pos = 0;
 469         long current_pos;
 470         fd_set readfds;
 471         fd_set writefds;
 472         fd_set excfds;
 473         int max_fd;
 474         struct timeval select_timeout;
 475         int finished = 0;
 476
 477         slot->finished = &finished;
 478         while (!finished) {
 479                 data_received = 0;
 480                 step_active_slots();
 481
 482                 if (!data_received && slot->local != NULL) {
 483                         current_pos = ftell(slot->local);
 484                         if (current_pos > last_pos)
 485                                 data_received++;
 486                         last_pos = current_pos;
 487                 }
 488
 489                 if (slot->in_use && !data_received) {
 490                         max_fd = 0;
 491                         FD_ZERO(&readfds);
 492                         FD_ZERO(&writefds);
 493                         FD_ZERO(&excfds);
 494                         select_timeout.tv_sec = 0;
 495                         select_timeout.tv_usec = 50000;
 496                         select(max_fd, &readfds, &writefds,
 497                                &excfds, &select_timeout);
 498                 }
 499         }
 500 #else
 501         while (slot->in_use) {
 502                 slot->curl_result = curl_easy_perform(slot->curl);
 503                 finish_active_slot(slot);
 504         }
 505 #endif
 506 }
 507
 508 static void closedown_active_slot(struct active_request_slot *slot)
 509 {
 510         active_requests--;
 511         slot->in_use = 0;
 512 }
 513
 514 void release_active_slot(struct active_request_slot *slot)
 515 {
 516         closedown_active_slot(slot);
 517         if (slot->curl) {
 518 #ifdef USE_CURL_MULTI
 519                 curl_multi_remove_handle(curlm, slot->curl);
 520 #endif
 521                 curl_easy_cleanup(slot->curl);
 522                 slot->curl = NULL;
 523         }
 524 #ifdef USE_CURL_MULTI
 525         fill_active_slots();
 526 #endif
 527 }
 528
 529 static void finish_active_slot(struct active_request_slot *slot)
 530 {
 531         closedown_active_slot(slot);
 532         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 533
 534         if (slot->finished != NULL)
 535                 (*slot->finished) = 1;
 536
 537         /* Store slot results so they can be read after the slot is reused */
 538         if (slot->results != NULL) {
 539                 slot->results->curl_result = slot->curl_result;
 540                 slot->results->http_code = slot->http_code;
 541         }
 542
 543         /* Run callback if appropriate */
 544         if (slot->callback_func != NULL) {
 545                 slot->callback_func(slot->callback_data);
 546         }
 547 }
 548
 549 void finish_all_active_slots(void)
 550 {
 551         struct active_request_slot *slot = active_queue_head;
 552
 553         while (slot != NULL)
 554                 if (slot->in_use) {
 555                         run_active_slot(slot);
 556                         slot = active_queue_head;
 557                 } else {
 558                         slot = slot->next;
 559                 }
 560 }
 561
 562 static inline int needs_quote(int ch)
 563 {
 564         if (((ch >= 'A') && (ch <= 'Z'))
 565                         || ((ch >= 'a') && (ch <= 'z'))
 566                         || ((ch >= '0') && (ch <= '9'))
 567                         || (ch == '/')
 568                         || (ch == '-')
 569                         || (ch == '.'))
 570                 return 0;
 571         return 1;
 572 }
 573
 574 static inline int hex(int v)
 575 {
 576         if (v < 10) return '0' + v;
 577         else return 'A' + v - 10;
 578 }
 579
 580 static char *quote_ref_url(const char *base, const char *ref)
 581 {
 582         const char *cp;
 583         char *dp, *qref;
 584         int len, baselen, ch;
 585
 586         baselen = strlen(base);
 587         len = baselen + 2; /* '/' after base and terminating NUL */
 588         for (cp = ref; (ch = *cp) != 0; cp++, len++)
 589                 if (needs_quote(ch))
 590                         len += 2; /* extra two hex plus replacement % */
 591         qref = xmalloc(len);
 592         memcpy(qref, base, baselen);
 593         dp = qref + baselen;
 594         *(dp++) = '/';
 595         for (cp = ref; (ch = *cp) != 0; cp++) {
 596                 if (needs_quote(ch)) {
 597                         *dp++ = '%';
 598                         *dp++ = hex((ch >> 4) & 0xF);
 599                         *dp++ = hex(ch & 0xF);
 600                 }
 601                 else
 602                         *dp++ = ch;
 603         }
 604         *dp = 0;
 605
 606         return qref;
 607 }
 608
 609 int http_fetch_ref(const char *base, struct ref *ref)
 610 {
 611         char *url;
 612         struct strbuf buffer = STRBUF_INIT;
 613         struct active_request_slot *slot;
 614         struct slot_results results;
 615         int ret;
 616
 617         url = quote_ref_url(base, ref->name);
 618         slot = get_active_slot();
 619         slot->results = &results;
 620         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 621         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 622         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 623         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 624         if (start_active_slot(slot)) {
 625                 run_active_slot(slot);
 626                 if (results.curl_result == CURLE_OK) {
 627                         strbuf_rtrim(&buffer);
 628                         if (buffer.len == 40)
 629                                 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
 630                         else if (!prefixcmp(buffer.buf, "ref: ")) {
 631                                 ref->symref = xstrdup(buffer.buf + 5);
 632                                 ret = 0;
 633                         } else
 634                                 ret = 1;
 635                 } else {
 636                         ret = error("Couldn't get %s for %s\n%s",
 637                                     url, ref->name, curl_errorstr);
 638                 }
 639         } else {
 640                 ret = error("Unable to start request");
 641         }
 642
 643         strbuf_release(&buffer);
 644         free(url);
 645         return ret;
 646 }