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