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 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                         if (!value)
 154                                 return config_error_nonbool(var);
 155                         curl_http_proxy = xstrdup(value);
 156                 }
 157                 return 0;
 158         }
 159
 160         /* Fall back on the default ones */
 161         return git_default_config(var, value, cb);
 162 }
 163
 164 static CURL* get_curl_handle(void)
 165 {
 166         CURL* result = curl_easy_init();
 167
 168         if (!curl_ssl_verify) {
 169                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 170                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 171         } else {
 172                 /* Verify authenticity of the peer's certificate */
 173                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 174                 /* The name in the cert must match whom we tried to connect */
 175                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 176         }
 177
 178 #if LIBCURL_VERSION_NUM >= 0x070907
 179         curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 180 #endif
 181
 182         if (ssl_cert != NULL)
 183                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 184 #if LIBCURL_VERSION_NUM >= 0x070902
 185         if (ssl_key != NULL)
 186                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 187 #endif
 188 #if LIBCURL_VERSION_NUM >= 0x070908
 189         if (ssl_capath != NULL)
 190                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 191 #endif
 192         if (ssl_cainfo != NULL)
 193                 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 194         curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 195
 196         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 197                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 198                                  curl_low_speed_limit);
 199                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 200                                  curl_low_speed_time);
 201         }
 202
 203         curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 204
 205         if (getenv("GIT_CURL_VERBOSE"))
 206                 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 207
 208         curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
 209
 210         if (curl_ftp_no_epsv)
 211                 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 212
 213         if (curl_http_proxy)
 214                 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 215
 216         return result;
 217 }
 218
 219 void http_init(struct remote *remote)
 220 {
 221         char *low_speed_limit;
 222         char *low_speed_time;
 223
 224         curl_global_init(CURL_GLOBAL_ALL);
 225
 226         if (remote && remote->http_proxy)
 227                 curl_http_proxy = xstrdup(remote->http_proxy);
 228
 229         pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 230
 231 #ifdef USE_CURL_MULTI
 232         {
 233                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 234                 if (http_max_requests != NULL)
 235                         max_requests = atoi(http_max_requests);
 236         }
 237
 238         curlm = curl_multi_init();
 239         if (curlm == NULL) {
 240                 fprintf(stderr, "Error creating curl multi handle.\n");
 241                 exit(1);
 242         }
 243 #endif
 244
 245         if (getenv("GIT_SSL_NO_VERIFY"))
 246                 curl_ssl_verify = 0;
 247
 248         ssl_cert = getenv("GIT_SSL_CERT");
 249 #if LIBCURL_VERSION_NUM >= 0x070902
 250         ssl_key = getenv("GIT_SSL_KEY");
 251 #endif
 252 #if LIBCURL_VERSION_NUM >= 0x070908
 253         ssl_capath = getenv("GIT_SSL_CAPATH");
 254 #endif
 255         ssl_cainfo = getenv("GIT_SSL_CAINFO");
 256
 257         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 258         if (low_speed_limit != NULL)
 259                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 260         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 261         if (low_speed_time != NULL)
 262                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 263
 264         git_config(http_options, NULL);
 265
 266         if (curl_ssl_verify == -1)
 267                 curl_ssl_verify = 1;
 268
 269 #ifdef USE_CURL_MULTI
 270         if (max_requests < 1)
 271                 max_requests = DEFAULT_MAX_REQUESTS;
 272 #endif
 273
 274         if (getenv("GIT_CURL_FTP_NO_EPSV"))
 275                 curl_ftp_no_epsv = 1;
 276
 277 #ifndef NO_CURL_EASY_DUPHANDLE
 278         curl_default = get_curl_handle();
 279 #endif
 280 }
 281
 282 void http_cleanup(void)
 283 {
 284         struct active_request_slot *slot = active_queue_head;
 285
 286         while (slot != NULL) {
 287                 struct active_request_slot *next = slot->next;
 288                 if (slot->curl != NULL) {
 289 #ifdef USE_CURL_MULTI
 290                         curl_multi_remove_handle(curlm, slot->curl);
 291 #endif
 292                         curl_easy_cleanup(slot->curl);
 293                 }
 294                 free(slot);
 295                 slot = next;
 296         }
 297         active_queue_head = NULL;
 298
 299 #ifndef NO_CURL_EASY_DUPHANDLE
 300         curl_easy_cleanup(curl_default);
 301 #endif
 302
 303 #ifdef USE_CURL_MULTI
 304         curl_multi_cleanup(curlm);
 305 #endif
 306         curl_global_cleanup();
 307
 308         curl_slist_free_all(pragma_header);
 309         pragma_header = NULL;
 310
 311         if (curl_http_proxy) {
 312                 free(curl_http_proxy);
 313                 curl_http_proxy = NULL;
 314         }
 315 }
 316
 317 struct active_request_slot *get_active_slot(void)
 318 {
 319         struct active_request_slot *slot = active_queue_head;
 320         struct active_request_slot *newslot;
 321
 322 #ifdef USE_CURL_MULTI
 323         int num_transfers;
 324
 325         /* Wait for a slot to open up if the queue is full */
 326         while (active_requests >= max_requests) {
 327                 curl_multi_perform(curlm, &num_transfers);
 328                 if (num_transfers < active_requests) {
 329                         process_curl_messages();
 330                 }
 331         }
 332 #endif
 333
 334         while (slot != NULL && slot->in_use) {
 335                 slot = slot->next;
 336         }
 337         if (slot == NULL) {
 338                 newslot = xmalloc(sizeof(*newslot));
 339                 newslot->curl = NULL;
 340                 newslot->in_use = 0;
 341                 newslot->next = NULL;
 342
 343                 slot = active_queue_head;
 344                 if (slot == NULL) {
 345                         active_queue_head = newslot;
 346                 } else {
 347                         while (slot->next != NULL) {
 348                                 slot = slot->next;
 349                         }
 350                         slot->next = newslot;
 351                 }
 352                 slot = newslot;
 353         }
 354
 355         if (slot->curl == NULL) {
 356 #ifdef NO_CURL_EASY_DUPHANDLE
 357                 slot->curl = get_curl_handle();
 358 #else
 359                 slot->curl = curl_easy_duphandle(curl_default);
 360 #endif
 361         }
 362
 363         active_requests++;
 364         slot->in_use = 1;
 365         slot->local = NULL;
 366         slot->results = NULL;
 367         slot->finished = NULL;
 368         slot->callback_data = NULL;
 369         slot->callback_func = NULL;
 370         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 371         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 372         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 373         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 374         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 375         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 376         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 377
 378         return slot;
 379 }
 380
 381 int start_active_slot(struct active_request_slot *slot)
 382 {
 383 #ifdef USE_CURL_MULTI
 384         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 385         int num_transfers;
 386
 387         if (curlm_result != CURLM_OK &&
 388             curlm_result != CURLM_CALL_MULTI_PERFORM) {
 389                 active_requests--;
 390                 slot->in_use = 0;
 391                 return 0;
 392         }
 393
 394         /*
 395          * We know there must be something to do, since we just added
 396          * something.
 397          */
 398         curl_multi_perform(curlm, &num_transfers);
 399 #endif
 400         return 1;
 401 }
 402
 403 #ifdef USE_CURL_MULTI
 404 struct fill_chain {
 405         void *data;
 406         int (*fill)(void *);
 407         struct fill_chain *next;
 408 };
 409
 410 static struct fill_chain *fill_cfg = NULL;
 411
 412 void add_fill_function(void *data, int (*fill)(void *))
 413 {
 414         struct fill_chain *new = malloc(sizeof(*new));
 415         struct fill_chain **linkp = &fill_cfg;
 416         new->data = data;
 417         new->fill = fill;
 418         new->next = NULL;
 419         while (*linkp)
 420                 linkp = &(*linkp)->next;
 421         *linkp = new;
 422 }
 423
 424 void fill_active_slots(void)
 425 {
 426         struct active_request_slot *slot = active_queue_head;
 427
 428         while (active_requests < max_requests) {
 429                 struct fill_chain *fill;
 430                 for (fill = fill_cfg; fill; fill = fill->next)
 431                         if (fill->fill(fill->data))
 432                                 break;
 433
 434                 if (!fill)
 435                         break;
 436         }
 437
 438         while (slot != NULL) {
 439                 if (!slot->in_use && slot->curl != NULL) {
 440                         curl_easy_cleanup(slot->curl);
 441                         slot->curl = NULL;
 442                 }
 443                 slot = slot->next;
 444         }
 445 }
 446
 447 void step_active_slots(void)
 448 {
 449         int num_transfers;
 450         CURLMcode curlm_result;
 451
 452         do {
 453                 curlm_result = curl_multi_perform(curlm, &num_transfers);
 454         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 455         if (num_transfers < active_requests) {
 456                 process_curl_messages();
 457                 fill_active_slots();
 458         }
 459 }
 460 #endif
 461
 462 void run_active_slot(struct active_request_slot *slot)
 463 {
 464 #ifdef USE_CURL_MULTI
 465         long last_pos = 0;
 466         long current_pos;
 467         fd_set readfds;
 468         fd_set writefds;
 469         fd_set excfds;
 470         int max_fd;
 471         struct timeval select_timeout;
 472         int finished = 0;
 473
 474         slot->finished = &finished;
 475         while (!finished) {
 476                 data_received = 0;
 477                 step_active_slots();
 478
 479                 if (!data_received && slot->local != NULL) {
 480                         current_pos = ftell(slot->local);
 481                         if (current_pos > last_pos)
 482                                 data_received++;
 483                         last_pos = current_pos;
 484                 }
 485
 486                 if (slot->in_use && !data_received) {
 487                         max_fd = 0;
 488                         FD_ZERO(&readfds);
 489                         FD_ZERO(&writefds);
 490                         FD_ZERO(&excfds);
 491                         select_timeout.tv_sec = 0;
 492                         select_timeout.tv_usec = 50000;
 493                         select(max_fd, &readfds, &writefds,
 494                                &excfds, &select_timeout);
 495                 }
 496         }
 497 #else
 498         while (slot->in_use) {
 499                 slot->curl_result = curl_easy_perform(slot->curl);
 500                 finish_active_slot(slot);
 501         }
 502 #endif
 503 }
 504
 505 static void closedown_active_slot(struct active_request_slot *slot)
 506 {
 507         active_requests--;
 508         slot->in_use = 0;
 509 }
 510
 511 void release_active_slot(struct active_request_slot *slot)
 512 {
 513         closedown_active_slot(slot);
 514         if (slot->curl) {
 515 #ifdef USE_CURL_MULTI
 516                 curl_multi_remove_handle(curlm, slot->curl);
 517 #endif
 518                 curl_easy_cleanup(slot->curl);
 519                 slot->curl = NULL;
 520         }
 521 #ifdef USE_CURL_MULTI
 522         fill_active_slots();
 523 #endif
 524 }
 525
 526 static void finish_active_slot(struct active_request_slot *slot)
 527 {
 528         closedown_active_slot(slot);
 529         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 530
 531         if (slot->finished != NULL)
 532                 (*slot->finished) = 1;
 533
 534         /* Store slot results so they can be read after the slot is reused */
 535         if (slot->results != NULL) {
 536                 slot->results->curl_result = slot->curl_result;
 537                 slot->results->http_code = slot->http_code;
 538         }
 539
 540         /* Run callback if appropriate */
 541         if (slot->callback_func != NULL) {
 542                 slot->callback_func(slot->callback_data);
 543         }
 544 }
 545
 546 void finish_all_active_slots(void)
 547 {
 548         struct active_request_slot *slot = active_queue_head;
 549
 550         while (slot != NULL)
 551                 if (slot->in_use) {
 552                         run_active_slot(slot);
 553                         slot = active_queue_head;
 554                 } else {
 555                         slot = slot->next;
 556                 }
 557 }
 558
 559 static inline int needs_quote(int ch)
 560 {
 561         if (((ch >= 'A') && (ch <= 'Z'))
 562                         || ((ch >= 'a') && (ch <= 'z'))
 563                         || ((ch >= '0') && (ch <= '9'))
 564                         || (ch == '/')
 565                         || (ch == '-')
 566                         || (ch == '.'))
 567                 return 0;
 568         return 1;
 569 }
 570
 571 static inline int hex(int v)
 572 {
 573         if (v < 10) return '0' + v;
 574         else return 'A' + v - 10;
 575 }
 576
 577 static char *quote_ref_url(const char *base, const char *ref)
 578 {
 579         const char *cp;
 580         char *dp, *qref;
 581         int len, baselen, ch;
 582
 583         baselen = strlen(base);
 584         len = baselen + 2; /* '/' after base and terminating NUL */
 585         for (cp = ref; (ch = *cp) != 0; cp++, len++)
 586                 if (needs_quote(ch))
 587                         len += 2; /* extra two hex plus replacement % */
 588         qref = xmalloc(len);
 589         memcpy(qref, base, baselen);
 590         dp = qref + baselen;
 591         *(dp++) = '/';
 592         for (cp = ref; (ch = *cp) != 0; cp++) {
 593                 if (needs_quote(ch)) {
 594                         *dp++ = '%';
 595                         *dp++ = hex((ch >> 4) & 0xF);
 596                         *dp++ = hex(ch & 0xF);
 597                 }
 598                 else
 599                         *dp++ = ch;
 600         }
 601         *dp = 0;
 602
 603         return qref;
 604 }
 605
 606 int http_fetch_ref(const char *base, struct ref *ref)
 607 {
 608         char *url;
 609         struct strbuf buffer = STRBUF_INIT;
 610         struct active_request_slot *slot;
 611         struct slot_results results;
 612         int ret;
 613
 614         url = quote_ref_url(base, ref->name);
 615         slot = get_active_slot();
 616         slot->results = &results;
 617         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 618         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 619         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 620         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 621         if (start_active_slot(slot)) {
 622                 run_active_slot(slot);
 623                 if (results.curl_result == CURLE_OK) {
 624                         strbuf_rtrim(&buffer);
 625                         if (buffer.len == 40)
 626                                 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
 627                         else if (!prefixcmp(buffer.buf, "ref: ")) {
 628                                 ref->symref = xstrdup(buffer.buf + 5);
 629                                 ret = 0;
 630                         } else
 631                                 ret = 1;
 632                 } else {
 633                         ret = error("Couldn't get %s for %s\n%s",
 634                                     url, ref->name, curl_errorstr);
 635                 }
 636         } else {
 637                 ret = error("Unable to start request");
 638         }
 639
 640         strbuf_release(&buffer);
 641         free(url);
 642         return ret;
 643 }