git.oblomov.eu Git - git/blob - http.c

   1 #include "git-compat-util.h"
   2 #include "http.h"
   3 #include "pack.h"
   4 #include "sideband.h"
   5 #include "run-command.h"
   6 #include "url.h"
   7 #include "urlmatch.h"
   8 #include "credential.h"
   9 #include "version.h"
  10 #include "pkt-line.h"
  11 #include "gettext.h"
  12 #include "transport.h"
  13
  14 static struct trace_key trace_curl = TRACE_KEY_INIT(CURL);
  15 #if LIBCURL_VERSION_NUM >= 0x070a08
  16 long int git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
  17 #else
  18 long int git_curl_ipresolve;
  19 #endif
  20 int active_requests;
  21 int http_is_verbose;
  22 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
  23
  24 #if LIBCURL_VERSION_NUM >= 0x070a06
  25 #define LIBCURL_CAN_HANDLE_AUTH_ANY
  26 #endif
  27
  28 static int min_curl_sessions = 1;
  29 static int curl_session_count;
  30 #ifdef USE_CURL_MULTI
  31 static int max_requests = -1;
  32 static CURLM *curlm;
  33 #endif
  34 #ifndef NO_CURL_EASY_DUPHANDLE
  35 static CURL *curl_default;
  36 #endif
  37
  38 #define PREV_BUF_SIZE 4096
  39
  40 char curl_errorstr[CURL_ERROR_SIZE];
  41
  42 static int curl_ssl_verify = -1;
  43 static int curl_ssl_try;
  44 static const char *ssl_cert;
  45 static const char *ssl_cipherlist;
  46 static const char *ssl_version;
  47 static struct {
  48         const char *name;
  49         long ssl_version;
  50 } sslversions[] = {
  51         { "sslv2", CURL_SSLVERSION_SSLv2 },
  52         { "sslv3", CURL_SSLVERSION_SSLv3 },
  53         { "tlsv1", CURL_SSLVERSION_TLSv1 },
  54 #if LIBCURL_VERSION_NUM >= 0x072200
  55         { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
  56         { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
  57         { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
  58 #endif
  59 };
  60 #if LIBCURL_VERSION_NUM >= 0x070903
  61 static const char *ssl_key;
  62 #endif
  63 #if LIBCURL_VERSION_NUM >= 0x070908
  64 static const char *ssl_capath;
  65 #endif
  66 #if LIBCURL_VERSION_NUM >= 0x072c00
  67 static const char *ssl_pinnedkey;
  68 #endif
  69 static const char *ssl_cainfo;
  70 static long curl_low_speed_limit = -1;
  71 static long curl_low_speed_time = -1;
  72 static int curl_ftp_no_epsv;
  73 static const char *curl_http_proxy;
  74 static const char *curl_no_proxy;
  75 static const char *http_proxy_authmethod;
  76 static struct {
  77         const char *name;
  78         long curlauth_param;
  79 } proxy_authmethods[] = {
  80         { "basic", CURLAUTH_BASIC },
  81         { "digest", CURLAUTH_DIGEST },
  82         { "negotiate", CURLAUTH_GSSNEGOTIATE },
  83         { "ntlm", CURLAUTH_NTLM },
  84 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
  85         { "anyauth", CURLAUTH_ANY },
  86 #endif
  87         /*
  88          * CURLAUTH_DIGEST_IE has no corresponding command-line option in
  89          * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
  90          * here, too
  91          */
  92 };
  93 static struct credential proxy_auth = CREDENTIAL_INIT;
  94 static const char *curl_proxyuserpwd;
  95 static const char *curl_cookie_file;
  96 static int curl_save_cookies;
  97 struct credential http_auth = CREDENTIAL_INIT;
  98 static int http_proactive_auth;
  99 static const char *user_agent;
 100 static int curl_empty_auth;
 101
 102 #if LIBCURL_VERSION_NUM >= 0x071700
 103 /* Use CURLOPT_KEYPASSWD as is */
 104 #elif LIBCURL_VERSION_NUM >= 0x070903
 105 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
 106 #else
 107 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
 108 #endif
 109
 110 static struct credential cert_auth = CREDENTIAL_INIT;
 111 static int ssl_cert_password_required;
 112 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 113 static unsigned long http_auth_methods = CURLAUTH_ANY;
 114 #endif
 115
 116 static struct curl_slist *pragma_header;
 117 static struct curl_slist *no_pragma_header;
 118
 119 static struct active_request_slot *active_queue_head;
 120
 121 static char *cached_accept_language;
 122
 123 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 124 {
 125         size_t size = eltsize * nmemb;
 126         struct buffer *buffer = buffer_;
 127
 128         if (size > buffer->buf.len - buffer->posn)
 129                 size = buffer->buf.len - buffer->posn;
 130         memcpy(ptr, buffer->buf.buf + buffer->posn, size);
 131         buffer->posn += size;
 132
 133         return size;
 134 }
 135
 136 #ifndef NO_CURL_IOCTL
 137 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
 138 {
 139         struct buffer *buffer = clientp;
 140
 141         switch (cmd) {
 142         case CURLIOCMD_NOP:
 143                 return CURLIOE_OK;
 144
 145         case CURLIOCMD_RESTARTREAD:
 146                 buffer->posn = 0;
 147                 return CURLIOE_OK;
 148
 149         default:
 150                 return CURLIOE_UNKNOWNCMD;
 151         }
 152 }
 153 #endif
 154
 155 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 156 {
 157         size_t size = eltsize * nmemb;
 158         struct strbuf *buffer = buffer_;
 159
 160         strbuf_add(buffer, ptr, size);
 161         return size;
 162 }
 163
 164 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 165 {
 166         return eltsize * nmemb;
 167 }
 168
 169 static void closedown_active_slot(struct active_request_slot *slot)
 170 {
 171         active_requests--;
 172         slot->in_use = 0;
 173 }
 174
 175 static void finish_active_slot(struct active_request_slot *slot)
 176 {
 177         closedown_active_slot(slot);
 178         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 179
 180         if (slot->finished != NULL)
 181                 (*slot->finished) = 1;
 182
 183         /* Store slot results so they can be read after the slot is reused */
 184         if (slot->results != NULL) {
 185                 slot->results->curl_result = slot->curl_result;
 186                 slot->results->http_code = slot->http_code;
 187 #if LIBCURL_VERSION_NUM >= 0x070a08
 188                 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
 189                                   &slot->results->auth_avail);
 190 #else
 191                 slot->results->auth_avail = 0;
 192 #endif
 193
 194                 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
 195                         &slot->results->http_connectcode);
 196         }
 197
 198         /* Run callback if appropriate */
 199         if (slot->callback_func != NULL)
 200                 slot->callback_func(slot->callback_data);
 201 }
 202
 203 #ifdef USE_CURL_MULTI
 204 static void process_curl_messages(void)
 205 {
 206         int num_messages;
 207         struct active_request_slot *slot;
 208         CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 209
 210         while (curl_message != NULL) {
 211                 if (curl_message->msg == CURLMSG_DONE) {
 212                         int curl_result = curl_message->data.result;
 213                         slot = active_queue_head;
 214                         while (slot != NULL &&
 215                                slot->curl != curl_message->easy_handle)
 216                                 slot = slot->next;
 217                         if (slot != NULL) {
 218                                 curl_multi_remove_handle(curlm, slot->curl);
 219                                 slot->curl_result = curl_result;
 220                                 finish_active_slot(slot);
 221                         } else {
 222                                 fprintf(stderr, "Received DONE message for unknown request!\n");
 223                         }
 224                 } else {
 225                         fprintf(stderr, "Unknown CURL message received: %d\n",
 226                                 (int)curl_message->msg);
 227                 }
 228                 curl_message = curl_multi_info_read(curlm, &num_messages);
 229         }
 230 }
 231 #endif
 232
 233 static int http_options(const char *var, const char *value, void *cb)
 234 {
 235         if (!strcmp("http.sslverify", var)) {
 236                 curl_ssl_verify = git_config_bool(var, value);
 237                 return 0;
 238         }
 239         if (!strcmp("http.sslcipherlist", var))
 240                 return git_config_string(&ssl_cipherlist, var, value);
 241         if (!strcmp("http.sslversion", var))
 242                 return git_config_string(&ssl_version, var, value);
 243         if (!strcmp("http.sslcert", var))
 244                 return git_config_string(&ssl_cert, var, value);
 245 #if LIBCURL_VERSION_NUM >= 0x070903
 246         if (!strcmp("http.sslkey", var))
 247                 return git_config_string(&ssl_key, var, value);
 248 #endif
 249 #if LIBCURL_VERSION_NUM >= 0x070908
 250         if (!strcmp("http.sslcapath", var))
 251                 return git_config_pathname(&ssl_capath, var, value);
 252 #endif
 253         if (!strcmp("http.sslcainfo", var))
 254                 return git_config_pathname(&ssl_cainfo, var, value);
 255         if (!strcmp("http.sslcertpasswordprotected", var)) {
 256                 ssl_cert_password_required = git_config_bool(var, value);
 257                 return 0;
 258         }
 259         if (!strcmp("http.ssltry", var)) {
 260                 curl_ssl_try = git_config_bool(var, value);
 261                 return 0;
 262         }
 263         if (!strcmp("http.minsessions", var)) {
 264                 min_curl_sessions = git_config_int(var, value);
 265 #ifndef USE_CURL_MULTI
 266                 if (min_curl_sessions > 1)
 267                         min_curl_sessions = 1;
 268 #endif
 269                 return 0;
 270         }
 271 #ifdef USE_CURL_MULTI
 272         if (!strcmp("http.maxrequests", var)) {
 273                 max_requests = git_config_int(var, value);
 274                 return 0;
 275         }
 276 #endif
 277         if (!strcmp("http.lowspeedlimit", var)) {
 278                 curl_low_speed_limit = (long)git_config_int(var, value);
 279                 return 0;
 280         }
 281         if (!strcmp("http.lowspeedtime", var)) {
 282                 curl_low_speed_time = (long)git_config_int(var, value);
 283                 return 0;
 284         }
 285
 286         if (!strcmp("http.noepsv", var)) {
 287                 curl_ftp_no_epsv = git_config_bool(var, value);
 288                 return 0;
 289         }
 290         if (!strcmp("http.proxy", var))
 291                 return git_config_string(&curl_http_proxy, var, value);
 292
 293         if (!strcmp("http.proxyauthmethod", var))
 294                 return git_config_string(&http_proxy_authmethod, var, value);
 295
 296         if (!strcmp("http.cookiefile", var))
 297                 return git_config_string(&curl_cookie_file, var, value);
 298         if (!strcmp("http.savecookies", var)) {
 299                 curl_save_cookies = git_config_bool(var, value);
 300                 return 0;
 301         }
 302
 303         if (!strcmp("http.postbuffer", var)) {
 304                 http_post_buffer = git_config_int(var, value);
 305                 if (http_post_buffer < LARGE_PACKET_MAX)
 306                         http_post_buffer = LARGE_PACKET_MAX;
 307                 return 0;
 308         }
 309
 310         if (!strcmp("http.useragent", var))
 311                 return git_config_string(&user_agent, var, value);
 312
 313         if (!strcmp("http.emptyauth", var)) {
 314                 curl_empty_auth = git_config_bool(var, value);
 315                 return 0;
 316         }
 317
 318         if (!strcmp("http.pinnedpubkey", var)) {
 319 #if LIBCURL_VERSION_NUM >= 0x072c00
 320                 return git_config_pathname(&ssl_pinnedkey, var, value);
 321 #else
 322                 warning(_("Public key pinning not supported with cURL < 7.44.0"));
 323                 return 0;
 324 #endif
 325         }
 326
 327         /* Fall back on the default ones */
 328         return git_default_config(var, value, cb);
 329 }
 330
 331 static void init_curl_http_auth(CURL *result)
 332 {
 333         if (!http_auth.username) {
 334                 if (curl_empty_auth)
 335                         curl_easy_setopt(result, CURLOPT_USERPWD, ":");
 336                 return;
 337         }
 338
 339         credential_fill(&http_auth);
 340
 341 #if LIBCURL_VERSION_NUM >= 0x071301
 342         curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
 343         curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
 344 #else
 345         {
 346                 static struct strbuf up = STRBUF_INIT;
 347                 /*
 348                  * Note that we assume we only ever have a single set of
 349                  * credentials in a given program run, so we do not have
 350                  * to worry about updating this buffer, only setting its
 351                  * initial value.
 352                  */
 353                 if (!up.len)
 354                         strbuf_addf(&up, "%s:%s",
 355                                 http_auth.username, http_auth.password);
 356                 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
 357         }
 358 #endif
 359 }
 360
 361 /* *var must be free-able */
 362 static void var_override(const char **var, char *value)
 363 {
 364         if (value) {
 365                 free((void *)*var);
 366                 *var = xstrdup(value);
 367         }
 368 }
 369
 370 static void set_proxyauth_name_password(CURL *result)
 371 {
 372 #if LIBCURL_VERSION_NUM >= 0x071301
 373                 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
 374                         proxy_auth.username);
 375                 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
 376                         proxy_auth.password);
 377 #else
 378                 struct strbuf s = STRBUF_INIT;
 379
 380                 strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
 381                 strbuf_addch(&s, ':');
 382                 strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
 383                 curl_proxyuserpwd = strbuf_detach(&s, NULL);
 384                 curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
 385 #endif
 386 }
 387
 388 static void init_curl_proxy_auth(CURL *result)
 389 {
 390         if (proxy_auth.username) {
 391                 if (!proxy_auth.password)
 392                         credential_fill(&proxy_auth);
 393                 set_proxyauth_name_password(result);
 394         }
 395
 396         var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
 397
 398 #if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
 399         if (http_proxy_authmethod) {
 400                 int i;
 401                 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
 402                         if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
 403                                 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
 404                                                 proxy_authmethods[i].curlauth_param);
 405                                 break;
 406                         }
 407                 }
 408                 if (i == ARRAY_SIZE(proxy_authmethods)) {
 409                         warning("unsupported proxy authentication method %s: using anyauth",
 410                                         http_proxy_authmethod);
 411                         curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 412                 }
 413         }
 414         else
 415                 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 416 #endif
 417 }
 418
 419 static int has_cert_password(void)
 420 {
 421         if (ssl_cert == NULL || ssl_cert_password_required != 1)
 422                 return 0;
 423         if (!cert_auth.password) {
 424                 cert_auth.protocol = xstrdup("cert");
 425                 cert_auth.username = xstrdup("");
 426                 cert_auth.path = xstrdup(ssl_cert);
 427                 credential_fill(&cert_auth);
 428         }
 429         return 1;
 430 }
 431
 432 #if LIBCURL_VERSION_NUM >= 0x071900
 433 static void set_curl_keepalive(CURL *c)
 434 {
 435         curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
 436 }
 437
 438 #elif LIBCURL_VERSION_NUM >= 0x071000
 439 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
 440 {
 441         int ka = 1;
 442         int rc;
 443         socklen_t len = (socklen_t)sizeof(ka);
 444
 445         if (type != CURLSOCKTYPE_IPCXN)
 446                 return 0;
 447
 448         rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
 449         if (rc < 0)
 450                 warning("unable to set SO_KEEPALIVE on socket %s",
 451                         strerror(errno));
 452
 453         return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
 454 }
 455
 456 static void set_curl_keepalive(CURL *c)
 457 {
 458         curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
 459 }
 460
 461 #else
 462 static void set_curl_keepalive(CURL *c)
 463 {
 464         /* not supported on older curl versions */
 465 }
 466 #endif
 467
 468 static void redact_sensitive_header(struct strbuf *header)
 469 {
 470         const char *sensitive_header;
 471
 472         if (skip_prefix(header->buf, "Authorization:", &sensitive_header) ||
 473             skip_prefix(header->buf, "Proxy-Authorization:", &sensitive_header)) {
 474                 /* The first token is the type, which is OK to log */
 475                 while (isspace(*sensitive_header))
 476                         sensitive_header++;
 477                 while (*sensitive_header && !isspace(*sensitive_header))
 478                         sensitive_header++;
 479                 /* Everything else is opaque and possibly sensitive */
 480                 strbuf_setlen(header,  sensitive_header - header->buf);
 481                 strbuf_addstr(header, " <redacted>");
 482         }
 483 }
 484
 485 static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
 486 {
 487         struct strbuf out = STRBUF_INIT;
 488         struct strbuf **headers, **header;
 489
 490         strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
 491                 text, (long)size, (long)size);
 492         trace_strbuf(&trace_curl, &out);
 493         strbuf_reset(&out);
 494         strbuf_add(&out, ptr, size);
 495         headers = strbuf_split_max(&out, '\n', 0);
 496
 497         for (header = headers; *header; header++) {
 498                 if (hide_sensitive_header)
 499                         redact_sensitive_header(*header);
 500                 strbuf_insert((*header), 0, text, strlen(text));
 501                 strbuf_insert((*header), strlen(text), ": ", 2);
 502                 strbuf_rtrim((*header));
 503                 strbuf_addch((*header), '\n');
 504                 trace_strbuf(&trace_curl, (*header));
 505         }
 506         strbuf_list_free(headers);
 507         strbuf_release(&out);
 508 }
 509
 510 static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
 511 {
 512         size_t i;
 513         struct strbuf out = STRBUF_INIT;
 514         unsigned int width = 60;
 515
 516         strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
 517                 text, (long)size, (long)size);
 518         trace_strbuf(&trace_curl, &out);
 519
 520         for (i = 0; i < size; i += width) {
 521                 size_t w;
 522
 523                 strbuf_reset(&out);
 524                 strbuf_addf(&out, "%s: ", text);
 525                 for (w = 0; (w < width) && (i + w < size); w++) {
 526                         unsigned char ch = ptr[i + w];
 527
 528                         strbuf_addch(&out,
 529                                        (ch >= 0x20) && (ch < 0x80)
 530                                        ? ch : '.');
 531                 }
 532                 strbuf_addch(&out, '\n');
 533                 trace_strbuf(&trace_curl, &out);
 534         }
 535         strbuf_release(&out);
 536 }
 537
 538 static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
 539 {
 540         const char *text;
 541         enum { NO_FILTER = 0, DO_FILTER = 1 };
 542
 543         switch (type) {
 544         case CURLINFO_TEXT:
 545                 trace_printf_key(&trace_curl, "== Info: %s", data);
 546         default:                /* we ignore unknown types by default */
 547                 return 0;
 548
 549         case CURLINFO_HEADER_OUT:
 550                 text = "=> Send header";
 551                 curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
 552                 break;
 553         case CURLINFO_DATA_OUT:
 554                 text = "=> Send data";
 555                 curl_dump_data(text, (unsigned char *)data, size);
 556                 break;
 557         case CURLINFO_SSL_DATA_OUT:
 558                 text = "=> Send SSL data";
 559                 curl_dump_data(text, (unsigned char *)data, size);
 560                 break;
 561         case CURLINFO_HEADER_IN:
 562                 text = "<= Recv header";
 563                 curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
 564                 break;
 565         case CURLINFO_DATA_IN:
 566                 text = "<= Recv data";
 567                 curl_dump_data(text, (unsigned char *)data, size);
 568                 break;
 569         case CURLINFO_SSL_DATA_IN:
 570                 text = "<= Recv SSL data";
 571                 curl_dump_data(text, (unsigned char *)data, size);
 572                 break;
 573         }
 574         return 0;
 575 }
 576
 577 void setup_curl_trace(CURL *handle)
 578 {
 579         if (!trace_want(&trace_curl))
 580                 return;
 581         curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
 582         curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
 583         curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
 584 }
 585
 586
 587 static CURL *get_curl_handle(void)
 588 {
 589         CURL *result = curl_easy_init();
 590         long allowed_protocols = 0;
 591
 592         if (!result)
 593                 die("curl_easy_init failed");
 594
 595         if (!curl_ssl_verify) {
 596                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 597                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 598         } else {
 599                 /* Verify authenticity of the peer's certificate */
 600                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 601                 /* The name in the cert must match whom we tried to connect */
 602                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 603         }
 604
 605 #if LIBCURL_VERSION_NUM >= 0x070907
 606         curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 607 #endif
 608 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 609         curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 610 #endif
 611
 612         if (http_proactive_auth)
 613                 init_curl_http_auth(result);
 614
 615         if (getenv("GIT_SSL_VERSION"))
 616                 ssl_version = getenv("GIT_SSL_VERSION");
 617         if (ssl_version && *ssl_version) {
 618                 int i;
 619                 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
 620                         if (!strcmp(ssl_version, sslversions[i].name)) {
 621                                 curl_easy_setopt(result, CURLOPT_SSLVERSION,
 622                                                  sslversions[i].ssl_version);
 623                                 break;
 624                         }
 625                 }
 626                 if (i == ARRAY_SIZE(sslversions))
 627                         warning("unsupported ssl version %s: using default",
 628                                 ssl_version);
 629         }
 630
 631         if (getenv("GIT_SSL_CIPHER_LIST"))
 632                 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
 633         if (ssl_cipherlist != NULL && *ssl_cipherlist)
 634                 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
 635                                 ssl_cipherlist);
 636
 637         if (ssl_cert != NULL)
 638                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 639         if (has_cert_password())
 640                 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
 641 #if LIBCURL_VERSION_NUM >= 0x070903
 642         if (ssl_key != NULL)
 643                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 644 #endif
 645 #if LIBCURL_VERSION_NUM >= 0x070908
 646         if (ssl_capath != NULL)
 647                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 648 #endif
 649 #if LIBCURL_VERSION_NUM >= 0x072c00
 650         if (ssl_pinnedkey != NULL)
 651                 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
 652 #endif
 653         if (ssl_cainfo != NULL)
 654                 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 655
 656         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 657                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 658                                  curl_low_speed_limit);
 659                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 660                                  curl_low_speed_time);
 661         }
 662
 663         curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 664         curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
 665 #if LIBCURL_VERSION_NUM >= 0x071301
 666         curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 667 #elif LIBCURL_VERSION_NUM >= 0x071101
 668         curl_easy_setopt(result, CURLOPT_POST301, 1);
 669 #endif
 670 #if LIBCURL_VERSION_NUM >= 0x071304
 671         if (is_transport_allowed("http"))
 672                 allowed_protocols |= CURLPROTO_HTTP;
 673         if (is_transport_allowed("https"))
 674                 allowed_protocols |= CURLPROTO_HTTPS;
 675         if (is_transport_allowed("ftp"))
 676                 allowed_protocols |= CURLPROTO_FTP;
 677         if (is_transport_allowed("ftps"))
 678                 allowed_protocols |= CURLPROTO_FTPS;
 679         curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
 680 #else
 681         if (transport_restrict_protocols())
 682                 warning("protocol restrictions not applied to curl redirects because\n"
 683                         "your curl version is too old (>= 7.19.4)");
 684 #endif
 685         if (getenv("GIT_CURL_VERBOSE"))
 686                 curl_easy_setopt(result, CURLOPT_VERBOSE, 1L);
 687         setup_curl_trace(result);
 688
 689         curl_easy_setopt(result, CURLOPT_USERAGENT,
 690                 user_agent ? user_agent : git_user_agent());
 691
 692         if (curl_ftp_no_epsv)
 693                 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 694
 695 #ifdef CURLOPT_USE_SSL
 696         if (curl_ssl_try)
 697                 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
 698 #endif
 699
 700         /*
 701          * CURL also examines these variables as a fallback; but we need to query
 702          * them here in order to decide whether to prompt for missing password (cf.
 703          * init_curl_proxy_auth()).
 704          *
 705          * Unlike many other common environment variables, these are historically
 706          * lowercase only. It appears that CURL did not know this and implemented
 707          * only uppercase variants, which was later corrected to take both - with
 708          * the exception of http_proxy, which is lowercase only also in CURL. As
 709          * the lowercase versions are the historical quasi-standard, they take
 710          * precedence here, as in CURL.
 711          */
 712         if (!curl_http_proxy) {
 713                 if (!strcmp(http_auth.protocol, "https")) {
 714                         var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
 715                         var_override(&curl_http_proxy, getenv("https_proxy"));
 716                 } else {
 717                         var_override(&curl_http_proxy, getenv("http_proxy"));
 718                 }
 719                 if (!curl_http_proxy) {
 720                         var_override(&curl_http_proxy, getenv("ALL_PROXY"));
 721                         var_override(&curl_http_proxy, getenv("all_proxy"));
 722                 }
 723         }
 724
 725         if (curl_http_proxy) {
 726                 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 727 #if LIBCURL_VERSION_NUM >= 0x071800
 728                 if (starts_with(curl_http_proxy, "socks5"))
 729                         curl_easy_setopt(result,
 730                                 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
 731                 else if (starts_with(curl_http_proxy, "socks4a"))
 732                         curl_easy_setopt(result,
 733                                 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
 734                 else if (starts_with(curl_http_proxy, "socks"))
 735                         curl_easy_setopt(result,
 736                                 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
 737 #endif
 738                 if (strstr(curl_http_proxy, "://"))
 739                         credential_from_url(&proxy_auth, curl_http_proxy);
 740                 else {
 741                         struct strbuf url = STRBUF_INIT;
 742                         strbuf_addf(&url, "http://%s", curl_http_proxy);
 743                         credential_from_url(&proxy_auth, url.buf);
 744                         strbuf_release(&url);
 745                 }
 746
 747                 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
 748 #if LIBCURL_VERSION_NUM >= 0x071304
 749                 var_override(&curl_no_proxy, getenv("NO_PROXY"));
 750                 var_override(&curl_no_proxy, getenv("no_proxy"));
 751                 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
 752 #endif
 753         }
 754         init_curl_proxy_auth(result);
 755
 756         set_curl_keepalive(result);
 757
 758         return result;
 759 }
 760
 761 static void set_from_env(const char **var, const char *envname)
 762 {
 763         const char *val = getenv(envname);
 764         if (val)
 765                 *var = val;
 766 }
 767
 768 void http_init(struct remote *remote, const char *url, int proactive_auth)
 769 {
 770         char *low_speed_limit;
 771         char *low_speed_time;
 772         char *normalized_url;
 773         struct urlmatch_config config = { STRING_LIST_INIT_DUP };
 774
 775         config.section = "http";
 776         config.key = NULL;
 777         config.collect_fn = http_options;
 778         config.cascade_fn = git_default_config;
 779         config.cb = NULL;
 780
 781         http_is_verbose = 0;
 782         normalized_url = url_normalize(url, &config.url);
 783
 784         git_config(urlmatch_config_entry, &config);
 785         free(normalized_url);
 786
 787         if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
 788                 die("curl_global_init failed");
 789
 790         http_proactive_auth = proactive_auth;
 791
 792         if (remote && remote->http_proxy)
 793                 curl_http_proxy = xstrdup(remote->http_proxy);
 794
 795         if (remote)
 796                 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
 797
 798         pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 799         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 800
 801 #ifdef USE_CURL_MULTI
 802         {
 803                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 804                 if (http_max_requests != NULL)
 805                         max_requests = atoi(http_max_requests);
 806         }
 807
 808         curlm = curl_multi_init();
 809         if (!curlm)
 810                 die("curl_multi_init failed");
 811 #endif
 812
 813         if (getenv("GIT_SSL_NO_VERIFY"))
 814                 curl_ssl_verify = 0;
 815
 816         set_from_env(&ssl_cert, "GIT_SSL_CERT");
 817 #if LIBCURL_VERSION_NUM >= 0x070903
 818         set_from_env(&ssl_key, "GIT_SSL_KEY");
 819 #endif
 820 #if LIBCURL_VERSION_NUM >= 0x070908
 821         set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 822 #endif
 823         set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 824
 825         set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 826
 827         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 828         if (low_speed_limit != NULL)
 829                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 830         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 831         if (low_speed_time != NULL)
 832                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 833
 834         if (curl_ssl_verify == -1)
 835                 curl_ssl_verify = 1;
 836
 837         curl_session_count = 0;
 838 #ifdef USE_CURL_MULTI
 839         if (max_requests < 1)
 840                 max_requests = DEFAULT_MAX_REQUESTS;
 841 #endif
 842
 843         if (getenv("GIT_CURL_FTP_NO_EPSV"))
 844                 curl_ftp_no_epsv = 1;
 845
 846         if (url) {
 847                 credential_from_url(&http_auth, url);
 848                 if (!ssl_cert_password_required &&
 849                     getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 850                     starts_with(url, "https://"))
 851                         ssl_cert_password_required = 1;
 852         }
 853
 854 #ifndef NO_CURL_EASY_DUPHANDLE
 855         curl_default = get_curl_handle();
 856 #endif
 857 }
 858
 859 void http_cleanup(void)
 860 {
 861         struct active_request_slot *slot = active_queue_head;
 862
 863         while (slot != NULL) {
 864                 struct active_request_slot *next = slot->next;
 865                 if (slot->curl != NULL) {
 866 #ifdef USE_CURL_MULTI
 867                         curl_multi_remove_handle(curlm, slot->curl);
 868 #endif
 869                         curl_easy_cleanup(slot->curl);
 870                 }
 871                 free(slot);
 872                 slot = next;
 873         }
 874         active_queue_head = NULL;
 875
 876 #ifndef NO_CURL_EASY_DUPHANDLE
 877         curl_easy_cleanup(curl_default);
 878 #endif
 879
 880 #ifdef USE_CURL_MULTI
 881         curl_multi_cleanup(curlm);
 882 #endif
 883         curl_global_cleanup();
 884
 885         curl_slist_free_all(pragma_header);
 886         pragma_header = NULL;
 887
 888         curl_slist_free_all(no_pragma_header);
 889         no_pragma_header = NULL;
 890
 891         if (curl_http_proxy) {
 892                 free((void *)curl_http_proxy);
 893                 curl_http_proxy = NULL;
 894         }
 895
 896         if (proxy_auth.password) {
 897                 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
 898                 free(proxy_auth.password);
 899                 proxy_auth.password = NULL;
 900         }
 901
 902         free((void *)curl_proxyuserpwd);
 903         curl_proxyuserpwd = NULL;
 904
 905         free((void *)http_proxy_authmethod);
 906         http_proxy_authmethod = NULL;
 907
 908         if (cert_auth.password != NULL) {
 909                 memset(cert_auth.password, 0, strlen(cert_auth.password));
 910                 free(cert_auth.password);
 911                 cert_auth.password = NULL;
 912         }
 913         ssl_cert_password_required = 0;
 914
 915         free(cached_accept_language);
 916         cached_accept_language = NULL;
 917 }
 918
 919 struct active_request_slot *get_active_slot(void)
 920 {
 921         struct active_request_slot *slot = active_queue_head;
 922         struct active_request_slot *newslot;
 923
 924 #ifdef USE_CURL_MULTI
 925         int num_transfers;
 926
 927         /* Wait for a slot to open up if the queue is full */
 928         while (active_requests >= max_requests) {
 929                 curl_multi_perform(curlm, &num_transfers);
 930                 if (num_transfers < active_requests)
 931                         process_curl_messages();
 932         }
 933 #endif
 934
 935         while (slot != NULL && slot->in_use)
 936                 slot = slot->next;
 937
 938         if (slot == NULL) {
 939                 newslot = xmalloc(sizeof(*newslot));
 940                 newslot->curl = NULL;
 941                 newslot->in_use = 0;
 942                 newslot->next = NULL;
 943
 944                 slot = active_queue_head;
 945                 if (slot == NULL) {
 946                         active_queue_head = newslot;
 947                 } else {
 948                         while (slot->next != NULL)
 949                                 slot = slot->next;
 950                         slot->next = newslot;
 951                 }
 952                 slot = newslot;
 953         }
 954
 955         if (slot->curl == NULL) {
 956 #ifdef NO_CURL_EASY_DUPHANDLE
 957                 slot->curl = get_curl_handle();
 958 #else
 959                 slot->curl = curl_easy_duphandle(curl_default);
 960 #endif
 961                 curl_session_count++;
 962         }
 963
 964         active_requests++;
 965         slot->in_use = 1;
 966         slot->results = NULL;
 967         slot->finished = NULL;
 968         slot->callback_data = NULL;
 969         slot->callback_func = NULL;
 970         curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
 971         if (curl_save_cookies)
 972                 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
 973         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 974         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 975         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 976         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 977         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 978         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
 979         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 980         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 981         curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
 982         curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
 983
 984 #if LIBCURL_VERSION_NUM >= 0x070a08
 985         curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
 986 #endif
 987 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 988         curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
 989 #endif
 990         if (http_auth.password || curl_empty_auth)
 991                 init_curl_http_auth(slot->curl);
 992
 993         return slot;
 994 }
 995
 996 int start_active_slot(struct active_request_slot *slot)
 997 {
 998 #ifdef USE_CURL_MULTI
 999         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1000         int num_transfers;
1001
1002         if (curlm_result != CURLM_OK &&
1003             curlm_result != CURLM_CALL_MULTI_PERFORM) {
1004                 active_requests--;
1005                 slot->in_use = 0;
1006                 return 0;
1007         }
1008
1009         /*
1010          * We know there must be something to do, since we just added
1011          * something.
1012          */
1013         curl_multi_perform(curlm, &num_transfers);
1014 #endif
1015         return 1;
1016 }
1017
1018 #ifdef USE_CURL_MULTI
1019 struct fill_chain {
1020         void *data;
1021         int (*fill)(void *);
1022         struct fill_chain *next;
1023 };
1024
1025 static struct fill_chain *fill_cfg;
1026
1027 void add_fill_function(void *data, int (*fill)(void *))
1028 {
1029         struct fill_chain *new = xmalloc(sizeof(*new));
1030         struct fill_chain **linkp = &fill_cfg;
1031         new->data = data;
1032         new->fill = fill;
1033         new->next = NULL;
1034         while (*linkp)
1035                 linkp = &(*linkp)->next;
1036         *linkp = new;
1037 }
1038
1039 void fill_active_slots(void)
1040 {
1041         struct active_request_slot *slot = active_queue_head;
1042
1043         while (active_requests < max_requests) {
1044                 struct fill_chain *fill;
1045                 for (fill = fill_cfg; fill; fill = fill->next)
1046                         if (fill->fill(fill->data))
1047                                 break;
1048
1049                 if (!fill)
1050                         break;
1051         }
1052
1053         while (slot != NULL) {
1054                 if (!slot->in_use && slot->curl != NULL
1055                         && curl_session_count > min_curl_sessions) {
1056                         curl_easy_cleanup(slot->curl);
1057                         slot->curl = NULL;
1058                         curl_session_count--;
1059                 }
1060                 slot = slot->next;
1061         }
1062 }
1063
1064 void step_active_slots(void)
1065 {
1066         int num_transfers;
1067         CURLMcode curlm_result;
1068
1069         do {
1070                 curlm_result = curl_multi_perform(curlm, &num_transfers);
1071         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1072         if (num_transfers < active_requests) {
1073                 process_curl_messages();
1074                 fill_active_slots();
1075         }
1076 }
1077 #endif
1078
1079 void run_active_slot(struct active_request_slot *slot)
1080 {
1081 #ifdef USE_CURL_MULTI
1082         fd_set readfds;
1083         fd_set writefds;
1084         fd_set excfds;
1085         int max_fd;
1086         struct timeval select_timeout;
1087         int finished = 0;
1088
1089         slot->finished = &finished;
1090         while (!finished) {
1091                 step_active_slots();
1092
1093                 if (slot->in_use) {
1094 #if LIBCURL_VERSION_NUM >= 0x070f04
1095                         long curl_timeout;
1096                         curl_multi_timeout(curlm, &curl_timeout);
1097                         if (curl_timeout == 0) {
1098                                 continue;
1099                         } else if (curl_timeout == -1) {
1100                                 select_timeout.tv_sec  = 0;
1101                                 select_timeout.tv_usec = 50000;
1102                         } else {
1103                                 select_timeout.tv_sec  =  curl_timeout / 1000;
1104                                 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1105                         }
1106 #else
1107                         select_timeout.tv_sec  = 0;
1108                         select_timeout.tv_usec = 50000;
1109 #endif
1110
1111                         max_fd = -1;
1112                         FD_ZERO(&readfds);
1113                         FD_ZERO(&writefds);
1114                         FD_ZERO(&excfds);
1115                         curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1116
1117                         /*
1118                          * It can happen that curl_multi_timeout returns a pathologically
1119                          * long timeout when curl_multi_fdset returns no file descriptors
1120                          * to read.  See commit message for more details.
1121                          */
1122                         if (max_fd < 0 &&
1123                             (select_timeout.tv_sec > 0 ||
1124                              select_timeout.tv_usec > 50000)) {
1125                                 select_timeout.tv_sec  = 0;
1126                                 select_timeout.tv_usec = 50000;
1127                         }
1128
1129                         select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1130                 }
1131         }
1132 #else
1133         while (slot->in_use) {
1134                 slot->curl_result = curl_easy_perform(slot->curl);
1135                 finish_active_slot(slot);
1136         }
1137 #endif
1138 }
1139
1140 static void release_active_slot(struct active_request_slot *slot)
1141 {
1142         closedown_active_slot(slot);
1143         if (slot->curl && curl_session_count > min_curl_sessions) {
1144 #ifdef USE_CURL_MULTI
1145                 curl_multi_remove_handle(curlm, slot->curl);
1146 #endif
1147                 curl_easy_cleanup(slot->curl);
1148                 slot->curl = NULL;
1149                 curl_session_count--;
1150         }
1151 #ifdef USE_CURL_MULTI
1152         fill_active_slots();
1153 #endif
1154 }
1155
1156 void finish_all_active_slots(void)
1157 {
1158         struct active_request_slot *slot = active_queue_head;
1159
1160         while (slot != NULL)
1161                 if (slot->in_use) {
1162                         run_active_slot(slot);
1163                         slot = active_queue_head;
1164                 } else {
1165                         slot = slot->next;
1166                 }
1167 }
1168
1169 /* Helpers for modifying and creating URLs */
1170 static inline int needs_quote(int ch)
1171 {
1172         if (((ch >= 'A') && (ch <= 'Z'))
1173                         || ((ch >= 'a') && (ch <= 'z'))
1174                         || ((ch >= '0') && (ch <= '9'))
1175                         || (ch == '/')
1176                         || (ch == '-')
1177                         || (ch == '.'))
1178                 return 0;
1179         return 1;
1180 }
1181
1182 static char *quote_ref_url(const char *base, const char *ref)
1183 {
1184         struct strbuf buf = STRBUF_INIT;
1185         const char *cp;
1186         int ch;
1187
1188         end_url_with_slash(&buf, base);
1189
1190         for (cp = ref; (ch = *cp) != 0; cp++)
1191                 if (needs_quote(ch))
1192                         strbuf_addf(&buf, "%%%02x", ch);
1193                 else
1194                         strbuf_addch(&buf, *cp);
1195
1196         return strbuf_detach(&buf, NULL);
1197 }
1198
1199 void append_remote_object_url(struct strbuf *buf, const char *url,
1200                               const char *hex,
1201                               int only_two_digit_prefix)
1202 {
1203         end_url_with_slash(buf, url);
1204
1205         strbuf_addf(buf, "objects/%.*s/", 2, hex);
1206         if (!only_two_digit_prefix)
1207                 strbuf_addf(buf, "%s", hex+2);
1208 }
1209
1210 char *get_remote_object_url(const char *url, const char *hex,
1211                             int only_two_digit_prefix)
1212 {
1213         struct strbuf buf = STRBUF_INIT;
1214         append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1215         return strbuf_detach(&buf, NULL);
1216 }
1217
1218 static int handle_curl_result(struct slot_results *results)
1219 {
1220         /*
1221          * If we see a failing http code with CURLE_OK, we have turned off
1222          * FAILONERROR (to keep the server's custom error response), and should
1223          * translate the code into failure here.
1224          */
1225         if (results->curl_result == CURLE_OK &&
1226             results->http_code >= 400) {
1227                 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1228                 /*
1229                  * Normally curl will already have put the "reason phrase"
1230                  * from the server into curl_errorstr; unfortunately without
1231                  * FAILONERROR it is lost, so we can give only the numeric
1232                  * status code.
1233                  */
1234                 snprintf(curl_errorstr, sizeof(curl_errorstr),
1235                          "The requested URL returned error: %ld",
1236                          results->http_code);
1237         }
1238
1239         if (results->curl_result == CURLE_OK) {
1240                 credential_approve(&http_auth);
1241                 if (proxy_auth.password)
1242                         credential_approve(&proxy_auth);
1243                 return HTTP_OK;
1244         } else if (missing_target(results))
1245                 return HTTP_MISSING_TARGET;
1246         else if (results->http_code == 401) {
1247                 if (http_auth.username && http_auth.password) {
1248                         credential_reject(&http_auth);
1249                         return HTTP_NOAUTH;
1250                 } else {
1251 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1252                         http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1253 #endif
1254                         return HTTP_REAUTH;
1255                 }
1256         } else {
1257                 if (results->http_connectcode == 407)
1258                         credential_reject(&proxy_auth);
1259 #if LIBCURL_VERSION_NUM >= 0x070c00
1260                 if (!curl_errorstr[0])
1261                         strlcpy(curl_errorstr,
1262                                 curl_easy_strerror(results->curl_result),
1263                                 sizeof(curl_errorstr));
1264 #endif
1265                 return HTTP_ERROR;
1266         }
1267 }
1268
1269 int run_one_slot(struct active_request_slot *slot,
1270                  struct slot_results *results)
1271 {
1272         slot->results = results;
1273         if (!start_active_slot(slot)) {
1274                 snprintf(curl_errorstr, sizeof(curl_errorstr),
1275                          "failed to start HTTP request");
1276                 return HTTP_START_FAILED;
1277         }
1278
1279         run_active_slot(slot);
1280         return handle_curl_result(results);
1281 }
1282
1283 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1284 {
1285         char *ptr;
1286         CURLcode ret;
1287
1288         strbuf_reset(buf);
1289         ret = curl_easy_getinfo(curl, info, &ptr);
1290         if (!ret && ptr)
1291                 strbuf_addstr(buf, ptr);
1292         return ret;
1293 }
1294
1295 /*
1296  * Check for and extract a content-type parameter. "raw"
1297  * should be positioned at the start of the potential
1298  * parameter, with any whitespace already removed.
1299  *
1300  * "name" is the name of the parameter. The value is appended
1301  * to "out".
1302  */
1303 static int extract_param(const char *raw, const char *name,
1304                          struct strbuf *out)
1305 {
1306         size_t len = strlen(name);
1307
1308         if (strncasecmp(raw, name, len))
1309                 return -1;
1310         raw += len;
1311
1312         if (*raw != '=')
1313                 return -1;
1314         raw++;
1315
1316         while (*raw && !isspace(*raw) && *raw != ';')
1317                 strbuf_addch(out, *raw++);
1318         return 0;
1319 }
1320
1321 /*
1322  * Extract a normalized version of the content type, with any
1323  * spaces suppressed, all letters lowercased, and no trailing ";"
1324  * or parameters.
1325  *
1326  * Note that we will silently remove even invalid whitespace. For
1327  * example, "text / plain" is specifically forbidden by RFC 2616,
1328  * but "text/plain" is the only reasonable output, and this keeps
1329  * our code simple.
1330  *
1331  * If the "charset" argument is not NULL, store the value of any
1332  * charset parameter there.
1333  *
1334  * Example:
1335  *   "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1336  *   "text / plain" -> "text/plain"
1337  */
1338 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1339                                  struct strbuf *charset)
1340 {
1341         const char *p;
1342
1343         strbuf_reset(type);
1344         strbuf_grow(type, raw->len);
1345         for (p = raw->buf; *p; p++) {
1346                 if (isspace(*p))
1347                         continue;
1348                 if (*p == ';') {
1349                         p++;
1350                         break;
1351                 }
1352                 strbuf_addch(type, tolower(*p));
1353         }
1354
1355         if (!charset)
1356                 return;
1357
1358         strbuf_reset(charset);
1359         while (*p) {
1360                 while (isspace(*p) || *p == ';')
1361                         p++;
1362                 if (!extract_param(p, "charset", charset))
1363                         return;
1364                 while (*p && !isspace(*p))
1365                         p++;
1366         }
1367
1368         if (!charset->len && starts_with(type->buf, "text/"))
1369                 strbuf_addstr(charset, "ISO-8859-1");
1370 }
1371
1372 static void write_accept_language(struct strbuf *buf)
1373 {
1374         /*
1375          * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1376          * that, q-value will be smaller than 0.001, the minimum q-value the
1377          * HTTP specification allows. See
1378          * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1379          */
1380         const int MAX_DECIMAL_PLACES = 3;
1381         const int MAX_LANGUAGE_TAGS = 1000;
1382         const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1383         char **language_tags = NULL;
1384         int num_langs = 0;
1385         const char *s = get_preferred_languages();
1386         int i;
1387         struct strbuf tag = STRBUF_INIT;
1388
1389         /* Don't add Accept-Language header if no language is preferred. */
1390         if (!s)
1391                 return;
1392
1393         /*
1394          * Split the colon-separated string of preferred languages into
1395          * language_tags array.
1396          */
1397         do {
1398                 /* collect language tag */
1399                 for (; *s && (isalnum(*s) || *s == '_'); s++)
1400                         strbuf_addch(&tag, *s == '_' ? '-' : *s);
1401
1402                 /* skip .codeset, @modifier and any other unnecessary parts */
1403                 while (*s && *s != ':')
1404                         s++;
1405
1406                 if (tag.len) {
1407                         num_langs++;
1408                         REALLOC_ARRAY(language_tags, num_langs);
1409                         language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1410                         if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1411                                 break;
1412                 }
1413         } while (*s++);
1414
1415         /* write Accept-Language header into buf */
1416         if (num_langs) {
1417                 int last_buf_len = 0;
1418                 int max_q;
1419                 int decimal_places;
1420                 char q_format[32];
1421
1422                 /* add '*' */
1423                 REALLOC_ARRAY(language_tags, num_langs + 1);
1424                 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1425
1426                 /* compute decimal_places */
1427                 for (max_q = 1, decimal_places = 0;
1428                      max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1429                      decimal_places++, max_q *= 10)
1430                         ;
1431
1432                 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1433
1434                 strbuf_addstr(buf, "Accept-Language: ");
1435
1436                 for (i = 0; i < num_langs; i++) {
1437                         if (i > 0)
1438                                 strbuf_addstr(buf, ", ");
1439
1440                         strbuf_addstr(buf, language_tags[i]);
1441
1442                         if (i > 0)
1443                                 strbuf_addf(buf, q_format, max_q - i);
1444
1445                         if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1446                                 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1447                                 break;
1448                         }
1449
1450                         last_buf_len = buf->len;
1451                 }
1452         }
1453
1454         /* free language tags -- last one is a static '*' */
1455         for (i = 0; i < num_langs - 1; i++)
1456                 free(language_tags[i]);
1457         free(language_tags);
1458 }
1459
1460 /*
1461  * Get an Accept-Language header which indicates user's preferred languages.
1462  *
1463  * Examples:
1464  *   LANGUAGE= -> ""
1465  *   LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1466  *   LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1467  *   LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1468  *   LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1469  *   LANGUAGE= LANG=C -> ""
1470  */
1471 static const char *get_accept_language(void)
1472 {
1473         if (!cached_accept_language) {
1474                 struct strbuf buf = STRBUF_INIT;
1475                 write_accept_language(&buf);
1476                 if (buf.len > 0)
1477                         cached_accept_language = strbuf_detach(&buf, NULL);
1478         }
1479
1480         return cached_accept_language;
1481 }
1482
1483 static void http_opt_request_remainder(CURL *curl, off_t pos)
1484 {
1485         char buf[128];
1486         xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1487         curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1488 }
1489
1490 /* http_request() targets */
1491 #define HTTP_REQUEST_STRBUF     0
1492 #define HTTP_REQUEST_FILE       1
1493
1494 static int http_request(const char *url,
1495                         void *result, int target,
1496                         const struct http_get_options *options)
1497 {
1498         struct active_request_slot *slot;
1499         struct slot_results results;
1500         struct curl_slist *headers = NULL;
1501         struct strbuf buf = STRBUF_INIT;
1502         const char *accept_language;
1503         int ret;
1504
1505         slot = get_active_slot();
1506         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1507
1508         if (result == NULL) {
1509                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1510         } else {
1511                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1512                 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1513
1514                 if (target == HTTP_REQUEST_FILE) {
1515                         off_t posn = ftello(result);
1516                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1517                                          fwrite);
1518                         if (posn > 0)
1519                                 http_opt_request_remainder(slot->curl, posn);
1520                 } else
1521                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1522                                          fwrite_buffer);
1523         }
1524
1525         accept_language = get_accept_language();
1526
1527         if (accept_language)
1528                 headers = curl_slist_append(headers, accept_language);
1529
1530         strbuf_addstr(&buf, "Pragma:");
1531         if (options && options->no_cache)
1532                 strbuf_addstr(&buf, " no-cache");
1533         if (options && options->keep_error)
1534                 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1535
1536         headers = curl_slist_append(headers, buf.buf);
1537
1538         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1539         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1540         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1541
1542         ret = run_one_slot(slot, &results);
1543
1544         if (options && options->content_type) {
1545                 struct strbuf raw = STRBUF_INIT;
1546                 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1547                 extract_content_type(&raw, options->content_type,
1548                                      options->charset);
1549                 strbuf_release(&raw);
1550         }
1551
1552         if (options && options->effective_url)
1553                 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1554                                 options->effective_url);
1555
1556         curl_slist_free_all(headers);
1557         strbuf_release(&buf);
1558
1559         return ret;
1560 }
1561
1562 /*
1563  * Update the "base" url to a more appropriate value, as deduced by
1564  * redirects seen when requesting a URL starting with "url".
1565  *
1566  * The "asked" parameter is a URL that we asked curl to access, and must begin
1567  * with "base".
1568  *
1569  * The "got" parameter is the URL that curl reported to us as where we ended
1570  * up.
1571  *
1572  * Returns 1 if we updated the base url, 0 otherwise.
1573  *
1574  * Our basic strategy is to compare "base" and "asked" to find the bits
1575  * specific to our request. We then strip those bits off of "got" to yield the
1576  * new base. So for example, if our base is "http://example.com/foo.git",
1577  * and we ask for "http://example.com/foo.git/info/refs", we might end up
1578  * with "https://other.example.com/foo.git/info/refs". We would want the
1579  * new URL to become "https://other.example.com/foo.git".
1580  *
1581  * Note that this assumes a sane redirect scheme. It's entirely possible
1582  * in the example above to end up at a URL that does not even end in
1583  * "info/refs".  In such a case we simply punt, as there is not much we can
1584  * do (and such a scheme is unlikely to represent a real git repository,
1585  * which means we are likely about to abort anyway).
1586  */
1587 static int update_url_from_redirect(struct strbuf *base,
1588                                     const char *asked,
1589                                     const struct strbuf *got)
1590 {
1591         const char *tail;
1592         size_t tail_len;
1593
1594         if (!strcmp(asked, got->buf))
1595                 return 0;
1596
1597         if (!skip_prefix(asked, base->buf, &tail))
1598                 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1599                     asked, base->buf);
1600
1601         tail_len = strlen(tail);
1602
1603         if (got->len < tail_len ||
1604             strcmp(tail, got->buf + got->len - tail_len))
1605                 return 0; /* insane redirect scheme */
1606
1607         strbuf_reset(base);
1608         strbuf_add(base, got->buf, got->len - tail_len);
1609         return 1;
1610 }
1611
1612 static int http_request_reauth(const char *url,
1613                                void *result, int target,
1614                                struct http_get_options *options)
1615 {
1616         int ret = http_request(url, result, target, options);
1617
1618         if (options && options->effective_url && options->base_url) {
1619                 if (update_url_from_redirect(options->base_url,
1620                                              url, options->effective_url)) {
1621                         credential_from_url(&http_auth, options->base_url->buf);
1622                         url = options->effective_url->buf;
1623                 }
1624         }
1625
1626         if (ret != HTTP_REAUTH)
1627                 return ret;
1628
1629         /*
1630          * If we are using KEEP_ERROR, the previous request may have
1631          * put cruft into our output stream; we should clear it out before
1632          * making our next request. We only know how to do this for
1633          * the strbuf case, but that is enough to satisfy current callers.
1634          */
1635         if (options && options->keep_error) {
1636                 switch (target) {
1637                 case HTTP_REQUEST_STRBUF:
1638                         strbuf_reset(result);
1639                         break;
1640                 default:
1641                         die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1642                 }
1643         }
1644
1645         credential_fill(&http_auth);
1646
1647         return http_request(url, result, target, options);
1648 }
1649
1650 int http_get_strbuf(const char *url,
1651                     struct strbuf *result,
1652                     struct http_get_options *options)
1653 {
1654         return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1655 }
1656
1657 /*
1658  * Downloads a URL and stores the result in the given file.
1659  *
1660  * If a previous interrupted download is detected (i.e. a previous temporary
1661  * file is still around) the download is resumed.
1662  */
1663 static int http_get_file(const char *url, const char *filename,
1664                          struct http_get_options *options)
1665 {
1666         int ret;
1667         struct strbuf tmpfile = STRBUF_INIT;
1668         FILE *result;
1669
1670         strbuf_addf(&tmpfile, "%s.temp", filename);
1671         result = fopen(tmpfile.buf, "a");
1672         if (!result) {
1673                 error("Unable to open local file %s", tmpfile.buf);
1674                 ret = HTTP_ERROR;
1675                 goto cleanup;
1676         }
1677
1678         ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1679         fclose(result);
1680
1681         if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1682                 ret = HTTP_ERROR;
1683 cleanup:
1684         strbuf_release(&tmpfile);
1685         return ret;
1686 }
1687
1688 int http_fetch_ref(const char *base, struct ref *ref)
1689 {
1690         struct http_get_options options = {0};
1691         char *url;
1692         struct strbuf buffer = STRBUF_INIT;
1693         int ret = -1;
1694
1695         options.no_cache = 1;
1696
1697         url = quote_ref_url(base, ref->name);
1698         if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1699                 strbuf_rtrim(&buffer);
1700                 if (buffer.len == 40)
1701                         ret = get_oid_hex(buffer.buf, &ref->old_oid);
1702                 else if (starts_with(buffer.buf, "ref: ")) {
1703                         ref->symref = xstrdup(buffer.buf + 5);
1704                         ret = 0;
1705                 }
1706         }
1707
1708         strbuf_release(&buffer);
1709         free(url);
1710         return ret;
1711 }
1712
1713 /* Helpers for fetching packs */
1714 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1715 {
1716         char *url, *tmp;
1717         struct strbuf buf = STRBUF_INIT;
1718
1719         if (http_is_verbose)
1720                 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1721
1722         end_url_with_slash(&buf, base_url);
1723         strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1724         url = strbuf_detach(&buf, NULL);
1725
1726         strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1727         tmp = strbuf_detach(&buf, NULL);
1728
1729         if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1730                 error("Unable to get pack index %s", url);
1731                 free(tmp);
1732                 tmp = NULL;
1733         }
1734
1735         free(url);
1736         return tmp;
1737 }
1738
1739 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1740         unsigned char *sha1, const char *base_url)
1741 {
1742         struct packed_git *new_pack;
1743         char *tmp_idx = NULL;
1744         int ret;
1745
1746         if (has_pack_index(sha1)) {
1747                 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1748                 if (!new_pack)
1749                         return -1; /* parse_pack_index() already issued error message */
1750                 goto add_pack;
1751         }
1752
1753         tmp_idx = fetch_pack_index(sha1, base_url);
1754         if (!tmp_idx)
1755                 return -1;
1756
1757         new_pack = parse_pack_index(sha1, tmp_idx);
1758         if (!new_pack) {
1759                 unlink(tmp_idx);
1760                 free(tmp_idx);
1761
1762                 return -1; /* parse_pack_index() already issued error message */
1763         }
1764
1765         ret = verify_pack_index(new_pack);
1766         if (!ret) {
1767                 close_pack_index(new_pack);
1768                 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1769         }
1770         free(tmp_idx);
1771         if (ret)
1772                 return -1;
1773
1774 add_pack:
1775         new_pack->next = *packs_head;
1776         *packs_head = new_pack;
1777         return 0;
1778 }
1779
1780 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1781 {
1782         struct http_get_options options = {0};
1783         int ret = 0, i = 0;
1784         char *url, *data;
1785         struct strbuf buf = STRBUF_INIT;
1786         unsigned char sha1[20];
1787
1788         end_url_with_slash(&buf, base_url);
1789         strbuf_addstr(&buf, "objects/info/packs");
1790         url = strbuf_detach(&buf, NULL);
1791
1792         options.no_cache = 1;
1793         ret = http_get_strbuf(url, &buf, &options);
1794         if (ret != HTTP_OK)
1795                 goto cleanup;
1796
1797         data = buf.buf;
1798         while (i < buf.len) {
1799                 switch (data[i]) {
1800                 case 'P':
1801                         i++;
1802                         if (i + 52 <= buf.len &&
1803                             starts_with(data + i, " pack-") &&
1804                             starts_with(data + i + 46, ".pack\n")) {
1805                                 get_sha1_hex(data + i + 6, sha1);
1806                                 fetch_and_setup_pack_index(packs_head, sha1,
1807                                                       base_url);
1808                                 i += 51;
1809                                 break;
1810                         }
1811                 default:
1812                         while (i < buf.len && data[i] != '\n')
1813                                 i++;
1814                 }
1815                 i++;
1816         }
1817
1818 cleanup:
1819         free(url);
1820         return ret;
1821 }
1822
1823 void release_http_pack_request(struct http_pack_request *preq)
1824 {
1825         if (preq->packfile != NULL) {
1826                 fclose(preq->packfile);
1827                 preq->packfile = NULL;
1828         }
1829         preq->slot = NULL;
1830         free(preq->url);
1831         free(preq);
1832 }
1833
1834 int finish_http_pack_request(struct http_pack_request *preq)
1835 {
1836         struct packed_git **lst;
1837         struct packed_git *p = preq->target;
1838         char *tmp_idx;
1839         size_t len;
1840         struct child_process ip = CHILD_PROCESS_INIT;
1841         const char *ip_argv[8];
1842
1843         close_pack_index(p);
1844
1845         fclose(preq->packfile);
1846         preq->packfile = NULL;
1847
1848         lst = preq->lst;
1849         while (*lst != p)
1850                 lst = &((*lst)->next);
1851         *lst = (*lst)->next;
1852
1853         if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
1854                 die("BUG: pack tmpfile does not end in .pack.temp?");
1855         tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
1856
1857         ip_argv[0] = "index-pack";
1858         ip_argv[1] = "-o";
1859         ip_argv[2] = tmp_idx;
1860         ip_argv[3] = preq->tmpfile;
1861         ip_argv[4] = NULL;
1862
1863         ip.argv = ip_argv;
1864         ip.git_cmd = 1;
1865         ip.no_stdin = 1;
1866         ip.no_stdout = 1;
1867
1868         if (run_command(&ip)) {
1869                 unlink(preq->tmpfile);
1870                 unlink(tmp_idx);
1871                 free(tmp_idx);
1872                 return -1;
1873         }
1874
1875         unlink(sha1_pack_index_name(p->sha1));
1876
1877         if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1878          || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1879                 free(tmp_idx);
1880                 return -1;
1881         }
1882
1883         install_packed_git(p);
1884         free(tmp_idx);
1885         return 0;
1886 }
1887
1888 struct http_pack_request *new_http_pack_request(
1889         struct packed_git *target, const char *base_url)
1890 {
1891         off_t prev_posn = 0;
1892         struct strbuf buf = STRBUF_INIT;
1893         struct http_pack_request *preq;
1894
1895         preq = xcalloc(1, sizeof(*preq));
1896         preq->target = target;
1897
1898         end_url_with_slash(&buf, base_url);
1899         strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1900                 sha1_to_hex(target->sha1));
1901         preq->url = strbuf_detach(&buf, NULL);
1902
1903         snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1904                 sha1_pack_name(target->sha1));
1905         preq->packfile = fopen(preq->tmpfile, "a");
1906         if (!preq->packfile) {
1907                 error("Unable to open local file %s for pack",
1908                       preq->tmpfile);
1909                 goto abort;
1910         }
1911
1912         preq->slot = get_active_slot();
1913         curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1914         curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1915         curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1916         curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1917                 no_pragma_header);
1918
1919         /*
1920          * If there is data present from a previous transfer attempt,
1921          * resume where it left off
1922          */
1923         prev_posn = ftello(preq->packfile);
1924         if (prev_posn>0) {
1925                 if (http_is_verbose)
1926                         fprintf(stderr,
1927                                 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
1928                                 sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
1929                 http_opt_request_remainder(preq->slot->curl, prev_posn);
1930         }
1931
1932         return preq;
1933
1934 abort:
1935         free(preq->url);
1936         free(preq);
1937         return NULL;
1938 }
1939
1940 /* Helpers for fetching objects (loose) */
1941 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1942                                void *data)
1943 {
1944         unsigned char expn[4096];
1945         size_t size = eltsize * nmemb;
1946         int posn = 0;
1947         struct http_object_request *freq =
1948                 (struct http_object_request *)data;
1949         do {
1950                 ssize_t retval = xwrite(freq->localfile,
1951                                         (char *) ptr + posn, size - posn);
1952                 if (retval < 0)
1953                         return posn;
1954                 posn += retval;
1955         } while (posn < size);
1956
1957         freq->stream.avail_in = size;
1958         freq->stream.next_in = (void *)ptr;
1959         do {
1960                 freq->stream.next_out = expn;
1961                 freq->stream.avail_out = sizeof(expn);
1962                 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1963                 git_SHA1_Update(&freq->c, expn,
1964                                 sizeof(expn) - freq->stream.avail_out);
1965         } while (freq->stream.avail_in && freq->zret == Z_OK);
1966         return size;
1967 }
1968
1969 struct http_object_request *new_http_object_request(const char *base_url,
1970         unsigned char *sha1)
1971 {
1972         char *hex = sha1_to_hex(sha1);
1973         const char *filename;
1974         char prevfile[PATH_MAX];
1975         int prevlocal;
1976         char prev_buf[PREV_BUF_SIZE];
1977         ssize_t prev_read = 0;
1978         off_t prev_posn = 0;
1979         struct http_object_request *freq;
1980
1981         freq = xcalloc(1, sizeof(*freq));
1982         hashcpy(freq->sha1, sha1);
1983         freq->localfile = -1;
1984
1985         filename = sha1_file_name(sha1);
1986         snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1987                  "%s.temp", filename);
1988
1989         snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1990         unlink_or_warn(prevfile);
1991         rename(freq->tmpfile, prevfile);
1992         unlink_or_warn(freq->tmpfile);
1993
1994         if (freq->localfile != -1)
1995                 error("fd leakage in start: %d", freq->localfile);
1996         freq->localfile = open(freq->tmpfile,
1997                                O_WRONLY | O_CREAT | O_EXCL, 0666);
1998         /*
1999          * This could have failed due to the "lazy directory creation";
2000          * try to mkdir the last path component.
2001          */
2002         if (freq->localfile < 0 && errno == ENOENT) {
2003                 char *dir = strrchr(freq->tmpfile, '/');
2004                 if (dir) {
2005                         *dir = 0;
2006                         mkdir(freq->tmpfile, 0777);
2007                         *dir = '/';
2008                 }
2009                 freq->localfile = open(freq->tmpfile,
2010                                        O_WRONLY | O_CREAT | O_EXCL, 0666);
2011         }
2012
2013         if (freq->localfile < 0) {
2014                 error("Couldn't create temporary file %s: %s",
2015                       freq->tmpfile, strerror(errno));
2016                 goto abort;
2017         }
2018
2019         git_inflate_init(&freq->stream);
2020
2021         git_SHA1_Init(&freq->c);
2022
2023         freq->url = get_remote_object_url(base_url, hex, 0);
2024
2025         /*
2026          * If a previous temp file is present, process what was already
2027          * fetched.
2028          */
2029         prevlocal = open(prevfile, O_RDONLY);
2030         if (prevlocal != -1) {
2031                 do {
2032                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2033                         if (prev_read>0) {
2034                                 if (fwrite_sha1_file(prev_buf,
2035                                                      1,
2036                                                      prev_read,
2037                                                      freq) == prev_read) {
2038                                         prev_posn += prev_read;
2039                                 } else {
2040                                         prev_read = -1;
2041                                 }
2042                         }
2043                 } while (prev_read > 0);
2044                 close(prevlocal);
2045         }
2046         unlink_or_warn(prevfile);
2047
2048         /*
2049          * Reset inflate/SHA1 if there was an error reading the previous temp
2050          * file; also rewind to the beginning of the local file.
2051          */
2052         if (prev_read == -1) {
2053                 memset(&freq->stream, 0, sizeof(freq->stream));
2054                 git_inflate_init(&freq->stream);
2055                 git_SHA1_Init(&freq->c);
2056                 if (prev_posn>0) {
2057                         prev_posn = 0;
2058                         lseek(freq->localfile, 0, SEEK_SET);
2059                         if (ftruncate(freq->localfile, 0) < 0) {
2060                                 error("Couldn't truncate temporary file %s: %s",
2061                                           freq->tmpfile, strerror(errno));
2062                                 goto abort;
2063                         }
2064                 }
2065         }
2066
2067         freq->slot = get_active_slot();
2068
2069         curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2070         curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2071         curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2072         curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2073         curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2074
2075         /*
2076          * If we have successfully processed data from a previous fetch
2077          * attempt, only fetch the data we don't already have.
2078          */
2079         if (prev_posn>0) {
2080                 if (http_is_verbose)
2081                         fprintf(stderr,
2082                                 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2083                                 hex, (uintmax_t)prev_posn);
2084                 http_opt_request_remainder(freq->slot->curl, prev_posn);
2085         }
2086
2087         return freq;
2088
2089 abort:
2090         free(freq->url);
2091         free(freq);
2092         return NULL;
2093 }
2094
2095 void process_http_object_request(struct http_object_request *freq)
2096 {
2097         if (freq->slot == NULL)
2098                 return;
2099         freq->curl_result = freq->slot->curl_result;
2100         freq->http_code = freq->slot->http_code;
2101         freq->slot = NULL;
2102 }
2103
2104 int finish_http_object_request(struct http_object_request *freq)
2105 {
2106         struct stat st;
2107
2108         close(freq->localfile);
2109         freq->localfile = -1;
2110
2111         process_http_object_request(freq);
2112
2113         if (freq->http_code == 416) {
2114                 warning("requested range invalid; we may already have all the data.");
2115         } else if (freq->curl_result != CURLE_OK) {
2116                 if (stat(freq->tmpfile, &st) == 0)
2117                         if (st.st_size == 0)
2118                                 unlink_or_warn(freq->tmpfile);
2119                 return -1;
2120         }
2121
2122         git_inflate_end(&freq->stream);
2123         git_SHA1_Final(freq->real_sha1, &freq->c);
2124         if (freq->zret != Z_STREAM_END) {
2125                 unlink_or_warn(freq->tmpfile);
2126                 return -1;
2127         }
2128         if (hashcmp(freq->sha1, freq->real_sha1)) {
2129                 unlink_or_warn(freq->tmpfile);
2130                 return -1;
2131         }
2132         freq->rename =
2133                 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
2134
2135         return freq->rename;
2136 }
2137
2138 void abort_http_object_request(struct http_object_request *freq)
2139 {
2140         unlink_or_warn(freq->tmpfile);
2141
2142         release_http_object_request(freq);
2143 }
2144
2145 void release_http_object_request(struct http_object_request *freq)
2146 {
2147         if (freq->localfile != -1) {
2148                 close(freq->localfile);
2149                 freq->localfile = -1;
2150         }
2151         if (freq->url != NULL) {
2152                 free(freq->url);
2153                 freq->url = NULL;
2154         }
2155         if (freq->slot != NULL) {
2156                 freq->slot->callback_func = NULL;
2157                 freq->slot->callback_data = NULL;
2158                 release_active_slot(freq->slot);
2159                 freq->slot = NULL;
2160         }
2161 }