http.c

   1 #include "http.h"
   2
   3 int data_received;
   4 int active_requests;
   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 const char *ssl_cert;
  17 #if LIBCURL_VERSION_NUM >= 0x070902
  18 static const char *ssl_key;
  19 #endif
  20 #if LIBCURL_VERSION_NUM >= 0x070908
  21 static const char *ssl_capath;
  22 #endif
  23 static const char *ssl_cainfo;
  24 static long curl_low_speed_limit = -1;
  25 static long curl_low_speed_time = -1;
  26 static int curl_ftp_no_epsv;
  27 static const char *curl_http_proxy;
  28 static char *user_name, *user_pass;
  29
  30 static struct curl_slist *pragma_header;
  31
  32 static struct active_request_slot *active_queue_head;
  33
  34 size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  35 {
  36         size_t size = eltsize * nmemb;
  37         struct buffer *buffer = buffer_;
  38
  39         if (size > buffer->buf.len - buffer->posn)
  40                 size = buffer->buf.len - buffer->posn;
  41         memcpy(ptr, buffer->buf.buf + buffer->posn, size);
  42         buffer->posn += size;
  43
  44         return size;
  45 }
  46
  47 size_t fwrite_buffer(const void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  48 {
  49         size_t size = eltsize * nmemb;
  50         struct strbuf *buffer = buffer_;
  51
  52         strbuf_add(buffer, ptr, size);
  53         data_received++;
  54         return size;
  55 }
  56
  57 size_t fwrite_null(const void *ptr, size_t eltsize, size_t nmemb, void *strbuf)
  58 {
  59         data_received++;
  60         return eltsize * nmemb;
  61 }
  62
  63 static void finish_active_slot(struct active_request_slot *slot);
  64
  65 #ifdef USE_CURL_MULTI
  66 static void process_curl_messages(void)
  67 {
  68         int num_messages;
  69         struct active_request_slot *slot;
  70         CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
  71
  72         while (curl_message != NULL) {
  73                 if (curl_message->msg == CURLMSG_DONE) {
  74                         int curl_result = curl_message->data.result;
  75                         slot = active_queue_head;
  76                         while (slot != NULL &&
  77                                slot->curl != curl_message->easy_handle)
  78                                 slot = slot->next;
  79                         if (slot != NULL) {
  80                                 curl_multi_remove_handle(curlm, slot->curl);
  81                                 slot->curl_result = curl_result;
  82                                 finish_active_slot(slot);
  83                         } else {
  84                                 fprintf(stderr, "Received DONE message for unknown request!\n");
  85                         }
  86                 } else {
  87                         fprintf(stderr, "Unknown CURL message received: %d\n",
  88                                 (int)curl_message->msg);
  89                 }
  90                 curl_message = curl_multi_info_read(curlm, &num_messages);
  91         }
  92 }
  93 #endif
  94
  95 static int http_options(const char *var, const char *value, void *cb)
  96 {
  97         if (!strcmp("http.sslverify", var)) {
  98                 curl_ssl_verify = git_config_bool(var, value);
  99                 return 0;
 100         }
 101         if (!strcmp("http.sslcert", var))
 102                 return git_config_string(&ssl_cert, var, value);
 103 #if LIBCURL_VERSION_NUM >= 0x070902
 104         if (!strcmp("http.sslkey", var))
 105                 return git_config_string(&ssl_key, var, value);
 106 #endif
 107 #if LIBCURL_VERSION_NUM >= 0x070908
 108         if (!strcmp("http.sslcapath", var))
 109                 return git_config_string(&ssl_capath, var, value);
 110 #endif
 111         if (!strcmp("http.sslcainfo", var))
 112                 return git_config_string(&ssl_cainfo, var, value);
 113 #ifdef USE_CURL_MULTI
 114         if (!strcmp("http.maxrequests", var)) {
 115                 max_requests = git_config_int(var, value);
 116                 return 0;
 117         }
 118 #endif
 119         if (!strcmp("http.lowspeedlimit", var)) {
 120                 curl_low_speed_limit = (long)git_config_int(var, value);
 121                 return 0;
 122         }
 123         if (!strcmp("http.lowspeedtime", var)) {
 124                 curl_low_speed_time = (long)git_config_int(var, value);
 125                 return 0;
 126         }
 127
 128         if (!strcmp("http.noepsv", var)) {
 129                 curl_ftp_no_epsv = git_config_bool(var, value);
 130                 return 0;
 131         }
 132         if (!strcmp("http.proxy", var))
 133                 return git_config_string(&curl_http_proxy, var, value);
 134
 135         /* Fall back on the default ones */
 136         return git_default_config(var, value, cb);
 137 }
 138
 139 static void init_curl_http_auth(CURL *result)
 140 {
 141         if (!user_name)
 142                 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 143         else {
 144                 struct strbuf up = STRBUF_INIT;
 145                 if (!user_pass)
 146                         user_pass = xstrdup(getpass("Password: "));
 147                 strbuf_addf(&up, "%s:%s", user_name, user_pass);
 148                 curl_easy_setopt(result, CURLOPT_USERPWD,
 149                                  strbuf_detach(&up, NULL));
 150         }
 151 }
 152
 153 static CURL *get_curl_handle(void)
 154 {
 155         CURL *result = curl_easy_init();
 156
 157         if (!curl_ssl_verify) {
 158                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 159                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 160         } else {
 161                 /* Verify authenticity of the peer's certificate */
 162                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 163                 /* The name in the cert must match whom we tried to connect */
 164                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 165         }
 166
 167 #if LIBCURL_VERSION_NUM >= 0x070907
 168         curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 169 #endif
 170
 171         init_curl_http_auth(result);
 172
 173         if (ssl_cert != NULL)
 174                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 175 #if LIBCURL_VERSION_NUM >= 0x070902
 176         if (ssl_key != NULL)
 177                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 178 #endif
 179 #if LIBCURL_VERSION_NUM >= 0x070908
 180         if (ssl_capath != NULL)
 181                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 182 #endif
 183         if (ssl_cainfo != NULL)
 184                 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 185         curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 186
 187         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 188                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 189                                  curl_low_speed_limit);
 190                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 191                                  curl_low_speed_time);
 192         }
 193
 194         curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 195
 196         if (getenv("GIT_CURL_VERBOSE"))
 197                 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 198
 199         curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
 200
 201         if (curl_ftp_no_epsv)
 202                 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 203
 204         if (curl_http_proxy)
 205                 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 206
 207         return result;
 208 }
 209
 210 static void http_auth_init(const char *url)
 211 {
 212         char *at, *colon, *cp, *slash;
 213         int len;
 214
 215         cp = strstr(url, "://");
 216         if (!cp)
 217                 return;
 218
 219         /*
 220          * Ok, the URL looks like "proto://something".  Which one?
 221          * "proto://<user>:<pass>@<host>/...",
 222          * "proto://<user>@<host>/...", or just
 223          * "proto://<host>/..."?
 224          */
 225         cp += 3;
 226         at = strchr(cp, '@');
 227         colon = strchr(cp, ':');
 228         slash = strchrnul(cp, '/');
 229         if (!at || slash <= at)
 230                 return; /* No credentials */
 231         if (!colon || at <= colon) {
 232                 /* Only username */
 233                 len = at - cp;
 234                 user_name = xmalloc(len + 1);
 235                 memcpy(user_name, cp, len);
 236                 user_name[len] = '\0';
 237                 user_pass = NULL;
 238         } else {
 239                 len = colon - cp;
 240                 user_name = xmalloc(len + 1);
 241                 memcpy(user_name, cp, len);
 242                 user_name[len] = '\0';
 243                 len = at - (colon + 1);
 244                 user_pass = xmalloc(len + 1);
 245                 memcpy(user_pass, colon + 1, len);
 246                 user_pass[len] = '\0';
 247         }
 248 }
 249
 250 static void set_from_env(const char **var, const char *envname)
 251 {
 252         const char *val = getenv(envname);
 253         if (val)
 254                 *var = val;
 255 }
 256
 257 void http_init(struct remote *remote)
 258 {
 259         char *low_speed_limit;
 260         char *low_speed_time;
 261
 262         git_config(http_options, NULL);
 263
 264         curl_global_init(CURL_GLOBAL_ALL);
 265
 266         if (remote && remote->http_proxy)
 267                 curl_http_proxy = xstrdup(remote->http_proxy);
 268
 269         pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 270
 271 #ifdef USE_CURL_MULTI
 272         {
 273                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 274                 if (http_max_requests != NULL)
 275                         max_requests = atoi(http_max_requests);
 276         }
 277
 278         curlm = curl_multi_init();
 279         if (curlm == NULL) {
 280                 fprintf(stderr, "Error creating curl multi handle.\n");
 281                 exit(1);
 282         }
 283 #endif
 284
 285         if (getenv("GIT_SSL_NO_VERIFY"))
 286                 curl_ssl_verify = 0;
 287
 288         set_from_env(&ssl_cert, "GIT_SSL_CERT");
 289 #if LIBCURL_VERSION_NUM >= 0x070902
 290         set_from_env(&ssl_key, "GIT_SSL_KEY");
 291 #endif
 292 #if LIBCURL_VERSION_NUM >= 0x070908
 293         set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 294 #endif
 295         set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 296
 297         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 298         if (low_speed_limit != NULL)
 299                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 300         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 301         if (low_speed_time != NULL)
 302                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 303
 304         if (curl_ssl_verify == -1)
 305                 curl_ssl_verify = 1;
 306
 307 #ifdef USE_CURL_MULTI
 308         if (max_requests < 1)
 309                 max_requests = DEFAULT_MAX_REQUESTS;
 310 #endif
 311
 312         if (getenv("GIT_CURL_FTP_NO_EPSV"))
 313                 curl_ftp_no_epsv = 1;
 314
 315         if (remote && remote->url && remote->url[0])
 316                 http_auth_init(remote->url[0]);
 317
 318 #ifndef NO_CURL_EASY_DUPHANDLE
 319         curl_default = get_curl_handle();
 320 #endif
 321 }
 322
 323 void http_cleanup(void)
 324 {
 325         struct active_request_slot *slot = active_queue_head;
 326
 327         while (slot != NULL) {
 328                 struct active_request_slot *next = slot->next;
 329                 if (slot->curl != NULL) {
 330 #ifdef USE_CURL_MULTI
 331                         curl_multi_remove_handle(curlm, slot->curl);
 332 #endif
 333                         curl_easy_cleanup(slot->curl);
 334                 }
 335                 free(slot);
 336                 slot = next;
 337         }
 338         active_queue_head = NULL;
 339
 340 #ifndef NO_CURL_EASY_DUPHANDLE
 341         curl_easy_cleanup(curl_default);
 342 #endif
 343
 344 #ifdef USE_CURL_MULTI
 345         curl_multi_cleanup(curlm);
 346 #endif
 347         curl_global_cleanup();
 348
 349         curl_slist_free_all(pragma_header);
 350         pragma_header = NULL;
 351
 352         if (curl_http_proxy) {
 353                 free((void *)curl_http_proxy);
 354                 curl_http_proxy = NULL;
 355         }
 356 }
 357
 358 struct active_request_slot *get_active_slot(void)
 359 {
 360         struct active_request_slot *slot = active_queue_head;
 361         struct active_request_slot *newslot;
 362
 363 #ifdef USE_CURL_MULTI
 364         int num_transfers;
 365
 366         /* Wait for a slot to open up if the queue is full */
 367         while (active_requests >= max_requests) {
 368                 curl_multi_perform(curlm, &num_transfers);
 369                 if (num_transfers < active_requests)
 370                         process_curl_messages();
 371         }
 372 #endif
 373
 374         while (slot != NULL && slot->in_use)
 375                 slot = slot->next;
 376
 377         if (slot == NULL) {
 378                 newslot = xmalloc(sizeof(*newslot));
 379                 newslot->curl = NULL;
 380                 newslot->in_use = 0;
 381                 newslot->next = NULL;
 382
 383                 slot = active_queue_head;
 384                 if (slot == NULL) {
 385                         active_queue_head = newslot;
 386                 } else {
 387                         while (slot->next != NULL)
 388                                 slot = slot->next;
 389                         slot->next = newslot;
 390                 }
 391                 slot = newslot;
 392         }
 393
 394         if (slot->curl == NULL) {
 395 #ifdef NO_CURL_EASY_DUPHANDLE
 396                 slot->curl = get_curl_handle();
 397 #else
 398                 slot->curl = curl_easy_duphandle(curl_default);
 399 #endif
 400         }
 401
 402         active_requests++;
 403         slot->in_use = 1;
 404         slot->local = NULL;
 405         slot->results = NULL;
 406         slot->finished = NULL;
 407         slot->callback_data = NULL;
 408         slot->callback_func = NULL;
 409         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 410         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 411         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 412         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 413         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 414         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 415         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 416
 417         return slot;
 418 }
 419
 420 int start_active_slot(struct active_request_slot *slot)
 421 {
 422 #ifdef USE_CURL_MULTI
 423         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 424         int num_transfers;
 425
 426         if (curlm_result != CURLM_OK &&
 427             curlm_result != CURLM_CALL_MULTI_PERFORM) {
 428                 active_requests--;
 429                 slot->in_use = 0;
 430                 return 0;
 431         }
 432
 433         /*
 434          * We know there must be something to do, since we just added
 435          * something.
 436          */
 437         curl_multi_perform(curlm, &num_transfers);
 438 #endif
 439         return 1;
 440 }
 441
 442 #ifdef USE_CURL_MULTI
 443 struct fill_chain {
 444         void *data;
 445         int (*fill)(void *);
 446         struct fill_chain *next;
 447 };
 448
 449 static struct fill_chain *fill_cfg;
 450
 451 void add_fill_function(void *data, int (*fill)(void *))
 452 {
 453         struct fill_chain *new = xmalloc(sizeof(*new));
 454         struct fill_chain **linkp = &fill_cfg;
 455         new->data = data;
 456         new->fill = fill;
 457         new->next = NULL;
 458         while (*linkp)
 459                 linkp = &(*linkp)->next;
 460         *linkp = new;
 461 }
 462
 463 void fill_active_slots(void)
 464 {
 465         struct active_request_slot *slot = active_queue_head;
 466
 467         while (active_requests < max_requests) {
 468                 struct fill_chain *fill;
 469                 for (fill = fill_cfg; fill; fill = fill->next)
 470                         if (fill->fill(fill->data))
 471                                 break;
 472
 473                 if (!fill)
 474                         break;
 475         }
 476
 477         while (slot != NULL) {
 478                 if (!slot->in_use && slot->curl != NULL) {
 479                         curl_easy_cleanup(slot->curl);
 480                         slot->curl = NULL;
 481                 }
 482                 slot = slot->next;
 483         }
 484 }
 485
 486 void step_active_slots(void)
 487 {
 488         int num_transfers;
 489         CURLMcode curlm_result;
 490
 491         do {
 492                 curlm_result = curl_multi_perform(curlm, &num_transfers);
 493         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 494         if (num_transfers < active_requests) {
 495                 process_curl_messages();
 496                 fill_active_slots();
 497         }
 498 }
 499 #endif
 500
 501 void run_active_slot(struct active_request_slot *slot)
 502 {
 503 #ifdef USE_CURL_MULTI
 504         long last_pos = 0;
 505         long current_pos;
 506         fd_set readfds;
 507         fd_set writefds;
 508         fd_set excfds;
 509         int max_fd;
 510         struct timeval select_timeout;
 511         int finished = 0;
 512
 513         slot->finished = &finished;
 514         while (!finished) {
 515                 data_received = 0;
 516                 step_active_slots();
 517
 518                 if (!data_received && slot->local != NULL) {
 519                         current_pos = ftell(slot->local);
 520                         if (current_pos > last_pos)
 521                                 data_received++;
 522                         last_pos = current_pos;
 523                 }
 524
 525                 if (slot->in_use && !data_received) {
 526                         max_fd = 0;
 527                         FD_ZERO(&readfds);
 528                         FD_ZERO(&writefds);
 529                         FD_ZERO(&excfds);
 530                         select_timeout.tv_sec = 0;
 531                         select_timeout.tv_usec = 50000;
 532                         select(max_fd, &readfds, &writefds,
 533                                &excfds, &select_timeout);
 534                 }
 535         }
 536 #else
 537         while (slot->in_use) {
 538                 slot->curl_result = curl_easy_perform(slot->curl);
 539                 finish_active_slot(slot);
 540         }
 541 #endif
 542 }
 543
 544 static void closedown_active_slot(struct active_request_slot *slot)
 545 {
 546         active_requests--;
 547         slot->in_use = 0;
 548 }
 549
 550 void release_active_slot(struct active_request_slot *slot)
 551 {
 552         closedown_active_slot(slot);
 553         if (slot->curl) {
 554 #ifdef USE_CURL_MULTI
 555                 curl_multi_remove_handle(curlm, slot->curl);
 556 #endif
 557                 curl_easy_cleanup(slot->curl);
 558                 slot->curl = NULL;
 559         }
 560 #ifdef USE_CURL_MULTI
 561         fill_active_slots();
 562 #endif
 563 }
 564
 565 static void finish_active_slot(struct active_request_slot *slot)
 566 {
 567         closedown_active_slot(slot);
 568         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 569
 570         if (slot->finished != NULL)
 571                 (*slot->finished) = 1;
 572
 573         /* Store slot results so they can be read after the slot is reused */
 574         if (slot->results != NULL) {
 575                 slot->results->curl_result = slot->curl_result;
 576                 slot->results->http_code = slot->http_code;
 577         }
 578
 579         /* Run callback if appropriate */
 580         if (slot->callback_func != NULL)
 581                 slot->callback_func(slot->callback_data);
 582 }
 583
 584 void finish_all_active_slots(void)
 585 {
 586         struct active_request_slot *slot = active_queue_head;
 587
 588         while (slot != NULL)
 589                 if (slot->in_use) {
 590                         run_active_slot(slot);
 591                         slot = active_queue_head;
 592                 } else {
 593                         slot = slot->next;
 594                 }
 595 }
 596
 597 static inline int needs_quote(int ch)
 598 {
 599         if (((ch >= 'A') && (ch <= 'Z'))
 600                         || ((ch >= 'a') && (ch <= 'z'))
 601                         || ((ch >= '0') && (ch <= '9'))
 602                         || (ch == '/')
 603                         || (ch == '-')
 604                         || (ch == '.'))
 605                 return 0;
 606         return 1;
 607 }
 608
 609 static inline int hex(int v)
 610 {
 611         if (v < 10)
 612                 return '0' + v;
 613         else
 614                 return 'A' + v - 10;
 615 }
 616
 617 static char *quote_ref_url(const char *base, const char *ref)
 618 {
 619         struct strbuf buf = STRBUF_INIT;
 620         const char *cp;
 621         int ch;
 622
 623         strbuf_addstr(&buf, base);
 624         if (buf.len && buf.buf[buf.len - 1] != '/' && *ref != '/')
 625                 strbuf_addstr(&buf, "/");
 626
 627         for (cp = ref; (ch = *cp) != 0; cp++)
 628                 if (needs_quote(ch))
 629                         strbuf_addf(&buf, "%%%02x", ch);
 630                 else
 631                         strbuf_addch(&buf, *cp);
 632
 633         return strbuf_detach(&buf, NULL);
 634 }
 635
 636 int http_fetch_ref(const char *base, struct ref *ref)
 637 {
 638         char *url;
 639         struct strbuf buffer = STRBUF_INIT;
 640         struct active_request_slot *slot;
 641         struct slot_results results;
 642         int ret;
 643
 644         url = quote_ref_url(base, ref->name);
 645         slot = get_active_slot();
 646         slot->results = &results;
 647         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 648         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 649         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 650         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 651         if (start_active_slot(slot)) {
 652                 run_active_slot(slot);
 653                 if (results.curl_result == CURLE_OK) {
 654                         strbuf_rtrim(&buffer);
 655                         if (buffer.len == 40)
 656                                 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
 657                         else if (!prefixcmp(buffer.buf, "ref: ")) {
 658                                 ref->symref = xstrdup(buffer.buf + 5);
 659                                 ret = 0;
 660                         } else
 661                                 ret = 1;
 662                 } else {
 663                         ret = error("Couldn't get %s for %s\n%s",
 664                                     url, ref->name, curl_errorstr);
 665                 }
 666         } else {
 667                 ret = error("Unable to start request");
 668         }
 669
 670         strbuf_release(&buffer);
 671         free(url);
 672         return ret;
 673 }