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