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