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

   1 #include "git-compat-util.h"
   2 #include "http.h"
   3 #include "config.h"
   4 #include "pack.h"
   5 #include "sideband.h"
   6 #include "run-command.h"
   7 #include "url.h"
   8 #include "urlmatch.h"
   9 #include "credential.h"
  10 #include "version.h"
  11 #include "pkt-line.h"
  12 #include "gettext.h"
  13 #include "transport.h"
  14 #include "packfile.h"
  15 #include "protocol.h"
  16
  17 static struct trace_key trace_curl = TRACE_KEY_INIT(CURL);
  18 #if LIBCURL_VERSION_NUM >= 0x070a08
  19 long int git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
  20 #else
  21 long int git_curl_ipresolve;
  22 #endif
  23 int active_requests;
  24 int http_is_verbose;
  25 ssize_t http_post_buffer = 16 * LARGE_PACKET_MAX;
  26
  27 #if LIBCURL_VERSION_NUM >= 0x070a06
  28 #define LIBCURL_CAN_HANDLE_AUTH_ANY
  29 #endif
  30
  31 static int min_curl_sessions = 1;
  32 static int curl_session_count;
  33 #ifdef USE_CURL_MULTI
  34 static int max_requests = -1;
  35 static CURLM *curlm;
  36 #endif
  37 #ifndef NO_CURL_EASY_DUPHANDLE
  38 static CURL *curl_default;
  39 #endif
  40
  41 #define PREV_BUF_SIZE 4096
  42
  43 char curl_errorstr[CURL_ERROR_SIZE];
  44
  45 static int curl_ssl_verify = -1;
  46 static int curl_ssl_try;
  47 static const char *ssl_cert;
  48 static const char *ssl_cipherlist;
  49 static const char *ssl_version;
  50 static struct {
  51         const char *name;
  52         long ssl_version;
  53 } sslversions[] = {
  54         { "sslv2", CURL_SSLVERSION_SSLv2 },
  55         { "sslv3", CURL_SSLVERSION_SSLv3 },
  56         { "tlsv1", CURL_SSLVERSION_TLSv1 },
  57 #if LIBCURL_VERSION_NUM >= 0x072200
  58         { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
  59         { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
  60         { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
  61 #endif
  62 };
  63 #if LIBCURL_VERSION_NUM >= 0x070903
  64 static const char *ssl_key;
  65 #endif
  66 #if LIBCURL_VERSION_NUM >= 0x070908
  67 static const char *ssl_capath;
  68 #endif
  69 #if LIBCURL_VERSION_NUM >= 0x072c00
  70 static const char *ssl_pinnedkey;
  71 #endif
  72 static const char *ssl_cainfo;
  73 static long curl_low_speed_limit = -1;
  74 static long curl_low_speed_time = -1;
  75 static int curl_ftp_no_epsv;
  76 static const char *curl_http_proxy;
  77 static const char *curl_no_proxy;
  78 static const char *http_proxy_authmethod;
  79 static struct {
  80         const char *name;
  81         long curlauth_param;
  82 } proxy_authmethods[] = {
  83         { "basic", CURLAUTH_BASIC },
  84         { "digest", CURLAUTH_DIGEST },
  85         { "negotiate", CURLAUTH_GSSNEGOTIATE },
  86         { "ntlm", CURLAUTH_NTLM },
  87 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
  88         { "anyauth", CURLAUTH_ANY },
  89 #endif
  90         /*
  91          * CURLAUTH_DIGEST_IE has no corresponding command-line option in
  92          * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
  93          * here, too
  94          */
  95 };
  96 #ifdef CURLGSSAPI_DELEGATION_FLAG
  97 static const char *curl_deleg;
  98 static struct {
  99         const char *name;
 100         long curl_deleg_param;
 101 } curl_deleg_levels[] = {
 102         { "none", CURLGSSAPI_DELEGATION_NONE },
 103         { "policy", CURLGSSAPI_DELEGATION_POLICY_FLAG },
 104         { "always", CURLGSSAPI_DELEGATION_FLAG },
 105 };
 106 #endif
 107
 108 static struct credential proxy_auth = CREDENTIAL_INIT;
 109 static const char *curl_proxyuserpwd;
 110 static const char *curl_cookie_file;
 111 static int curl_save_cookies;
 112 struct credential http_auth = CREDENTIAL_INIT;
 113 static int http_proactive_auth;
 114 static const char *user_agent;
 115 static int curl_empty_auth = -1;
 116
 117 enum http_follow_config http_follow_config = HTTP_FOLLOW_INITIAL;
 118
 119 #if LIBCURL_VERSION_NUM >= 0x071700
 120 /* Use CURLOPT_KEYPASSWD as is */
 121 #elif LIBCURL_VERSION_NUM >= 0x070903
 122 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
 123 #else
 124 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
 125 #endif
 126
 127 static struct credential cert_auth = CREDENTIAL_INIT;
 128 static int ssl_cert_password_required;
 129 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 130 static unsigned long http_auth_methods = CURLAUTH_ANY;
 131 static int http_auth_methods_restricted;
 132 /* Modes for which empty_auth cannot actually help us. */
 133 static unsigned long empty_auth_useless =
 134         CURLAUTH_BASIC
 135 #ifdef CURLAUTH_DIGEST_IE
 136         | CURLAUTH_DIGEST_IE
 137 #endif
 138         | CURLAUTH_DIGEST;
 139 #endif
 140
 141 static struct curl_slist *pragma_header;
 142 static struct curl_slist *no_pragma_header;
 143 static struct curl_slist *extra_http_headers;
 144
 145 static struct active_request_slot *active_queue_head;
 146
 147 static char *cached_accept_language;
 148
 149 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 150 {
 151         size_t size = eltsize * nmemb;
 152         struct buffer *buffer = buffer_;
 153
 154         if (size > buffer->buf.len - buffer->posn)
 155                 size = buffer->buf.len - buffer->posn;
 156         memcpy(ptr, buffer->buf.buf + buffer->posn, size);
 157         buffer->posn += size;
 158
 159         return size;
 160 }
 161
 162 #ifndef NO_CURL_IOCTL
 163 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
 164 {
 165         struct buffer *buffer = clientp;
 166
 167         switch (cmd) {
 168         case CURLIOCMD_NOP:
 169                 return CURLIOE_OK;
 170
 171         case CURLIOCMD_RESTARTREAD:
 172                 buffer->posn = 0;
 173                 return CURLIOE_OK;
 174
 175         default:
 176                 return CURLIOE_UNKNOWNCMD;
 177         }
 178 }
 179 #endif
 180
 181 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 182 {
 183         size_t size = eltsize * nmemb;
 184         struct strbuf *buffer = buffer_;
 185
 186         strbuf_add(buffer, ptr, size);
 187         return size;
 188 }
 189
 190 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 191 {
 192         return eltsize * nmemb;
 193 }
 194
 195 static void closedown_active_slot(struct active_request_slot *slot)
 196 {
 197         active_requests--;
 198         slot->in_use = 0;
 199 }
 200
 201 static void finish_active_slot(struct active_request_slot *slot)
 202 {
 203         closedown_active_slot(slot);
 204         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 205
 206         if (slot->finished != NULL)
 207                 (*slot->finished) = 1;
 208
 209         /* Store slot results so they can be read after the slot is reused */
 210         if (slot->results != NULL) {
 211                 slot->results->curl_result = slot->curl_result;
 212                 slot->results->http_code = slot->http_code;
 213 #if LIBCURL_VERSION_NUM >= 0x070a08
 214                 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
 215                                   &slot->results->auth_avail);
 216 #else
 217                 slot->results->auth_avail = 0;
 218 #endif
 219
 220                 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
 221                         &slot->results->http_connectcode);
 222         }
 223
 224         /* Run callback if appropriate */
 225         if (slot->callback_func != NULL)
 226                 slot->callback_func(slot->callback_data);
 227 }
 228
 229 static void xmulti_remove_handle(struct active_request_slot *slot)
 230 {
 231 #ifdef USE_CURL_MULTI
 232         curl_multi_remove_handle(curlm, slot->curl);
 233 #endif
 234 }
 235
 236 #ifdef USE_CURL_MULTI
 237 static void process_curl_messages(void)
 238 {
 239         int num_messages;
 240         struct active_request_slot *slot;
 241         CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 242
 243         while (curl_message != NULL) {
 244                 if (curl_message->msg == CURLMSG_DONE) {
 245                         int curl_result = curl_message->data.result;
 246                         slot = active_queue_head;
 247                         while (slot != NULL &&
 248                                slot->curl != curl_message->easy_handle)
 249                                 slot = slot->next;
 250                         if (slot != NULL) {
 251                                 xmulti_remove_handle(slot);
 252                                 slot->curl_result = curl_result;
 253                                 finish_active_slot(slot);
 254                         } else {
 255                                 fprintf(stderr, "Received DONE message for unknown request!\n");
 256                         }
 257                 } else {
 258                         fprintf(stderr, "Unknown CURL message received: %d\n",
 259                                 (int)curl_message->msg);
 260                 }
 261                 curl_message = curl_multi_info_read(curlm, &num_messages);
 262         }
 263 }
 264 #endif
 265
 266 static int http_options(const char *var, const char *value, void *cb)
 267 {
 268         if (!strcmp("http.sslverify", var)) {
 269                 curl_ssl_verify = git_config_bool(var, value);
 270                 return 0;
 271         }
 272         if (!strcmp("http.sslcipherlist", var))
 273                 return git_config_string(&ssl_cipherlist, var, value);
 274         if (!strcmp("http.sslversion", var))
 275                 return git_config_string(&ssl_version, var, value);
 276         if (!strcmp("http.sslcert", var))
 277                 return git_config_pathname(&ssl_cert, var, value);
 278 #if LIBCURL_VERSION_NUM >= 0x070903
 279         if (!strcmp("http.sslkey", var))
 280                 return git_config_pathname(&ssl_key, var, value);
 281 #endif
 282 #if LIBCURL_VERSION_NUM >= 0x070908
 283         if (!strcmp("http.sslcapath", var))
 284                 return git_config_pathname(&ssl_capath, var, value);
 285 #endif
 286         if (!strcmp("http.sslcainfo", var))
 287                 return git_config_pathname(&ssl_cainfo, var, value);
 288         if (!strcmp("http.sslcertpasswordprotected", var)) {
 289                 ssl_cert_password_required = git_config_bool(var, value);
 290                 return 0;
 291         }
 292         if (!strcmp("http.ssltry", var)) {
 293                 curl_ssl_try = git_config_bool(var, value);
 294                 return 0;
 295         }
 296         if (!strcmp("http.minsessions", var)) {
 297                 min_curl_sessions = git_config_int(var, value);
 298 #ifndef USE_CURL_MULTI
 299                 if (min_curl_sessions > 1)
 300                         min_curl_sessions = 1;
 301 #endif
 302                 return 0;
 303         }
 304 #ifdef USE_CURL_MULTI
 305         if (!strcmp("http.maxrequests", var)) {
 306                 max_requests = git_config_int(var, value);
 307                 return 0;
 308         }
 309 #endif
 310         if (!strcmp("http.lowspeedlimit", var)) {
 311                 curl_low_speed_limit = (long)git_config_int(var, value);
 312                 return 0;
 313         }
 314         if (!strcmp("http.lowspeedtime", var)) {
 315                 curl_low_speed_time = (long)git_config_int(var, value);
 316                 return 0;
 317         }
 318
 319         if (!strcmp("http.noepsv", var)) {
 320                 curl_ftp_no_epsv = git_config_bool(var, value);
 321                 return 0;
 322         }
 323         if (!strcmp("http.proxy", var))
 324                 return git_config_string(&curl_http_proxy, var, value);
 325
 326         if (!strcmp("http.proxyauthmethod", var))
 327                 return git_config_string(&http_proxy_authmethod, var, value);
 328
 329         if (!strcmp("http.cookiefile", var))
 330                 return git_config_pathname(&curl_cookie_file, var, value);
 331         if (!strcmp("http.savecookies", var)) {
 332                 curl_save_cookies = git_config_bool(var, value);
 333                 return 0;
 334         }
 335
 336         if (!strcmp("http.postbuffer", var)) {
 337                 http_post_buffer = git_config_ssize_t(var, value);
 338                 if (http_post_buffer < 0)
 339                         warning(_("negative value for http.postbuffer; defaulting to %d"), LARGE_PACKET_MAX);
 340                 if (http_post_buffer < LARGE_PACKET_MAX)
 341                         http_post_buffer = LARGE_PACKET_MAX;
 342                 return 0;
 343         }
 344
 345         if (!strcmp("http.useragent", var))
 346                 return git_config_string(&user_agent, var, value);
 347
 348         if (!strcmp("http.emptyauth", var)) {
 349                 if (value && !strcmp("auto", value))
 350                         curl_empty_auth = -1;
 351                 else
 352                         curl_empty_auth = git_config_bool(var, value);
 353                 return 0;
 354         }
 355
 356         if (!strcmp("http.delegation", var)) {
 357 #ifdef CURLGSSAPI_DELEGATION_FLAG
 358                 return git_config_string(&curl_deleg, var, value);
 359 #else
 360                 warning(_("Delegation control is not supported with cURL < 7.22.0"));
 361                 return 0;
 362 #endif
 363         }
 364
 365         if (!strcmp("http.pinnedpubkey", var)) {
 366 #if LIBCURL_VERSION_NUM >= 0x072c00
 367                 return git_config_pathname(&ssl_pinnedkey, var, value);
 368 #else
 369                 warning(_("Public key pinning not supported with cURL < 7.44.0"));
 370                 return 0;
 371 #endif
 372         }
 373
 374         if (!strcmp("http.extraheader", var)) {
 375                 if (!value) {
 376                         return config_error_nonbool(var);
 377                 } else if (!*value) {
 378                         curl_slist_free_all(extra_http_headers);
 379                         extra_http_headers = NULL;
 380                 } else {
 381                         extra_http_headers =
 382                                 curl_slist_append(extra_http_headers, value);
 383                 }
 384                 return 0;
 385         }
 386
 387         if (!strcmp("http.followredirects", var)) {
 388                 if (value && !strcmp(value, "initial"))
 389                         http_follow_config = HTTP_FOLLOW_INITIAL;
 390                 else if (git_config_bool(var, value))
 391                         http_follow_config = HTTP_FOLLOW_ALWAYS;
 392                 else
 393                         http_follow_config = HTTP_FOLLOW_NONE;
 394                 return 0;
 395         }
 396
 397         /* Fall back on the default ones */
 398         return git_default_config(var, value, cb);
 399 }
 400
 401 static int curl_empty_auth_enabled(void)
 402 {
 403         if (curl_empty_auth >= 0)
 404                 return curl_empty_auth;
 405
 406 #ifndef LIBCURL_CAN_HANDLE_AUTH_ANY
 407         /*
 408          * Our libcurl is too old to do AUTH_ANY in the first place;
 409          * just default to turning the feature off.
 410          */
 411 #else
 412         /*
 413          * In the automatic case, kick in the empty-auth
 414          * hack as long as we would potentially try some
 415          * method more exotic than "Basic" or "Digest".
 416          *
 417          * But only do this when this is our second or
 418          * subsequent request, as by then we know what
 419          * methods are available.
 420          */
 421         if (http_auth_methods_restricted &&
 422             (http_auth_methods & ~empty_auth_useless))
 423                 return 1;
 424 #endif
 425         return 0;
 426 }
 427
 428 static void init_curl_http_auth(CURL *result)
 429 {
 430         if (!http_auth.username || !*http_auth.username) {
 431                 if (curl_empty_auth_enabled())
 432                         curl_easy_setopt(result, CURLOPT_USERPWD, ":");
 433                 return;
 434         }
 435
 436         credential_fill(&http_auth);
 437
 438 #if LIBCURL_VERSION_NUM >= 0x071301
 439         curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
 440         curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
 441 #else
 442         {
 443                 static struct strbuf up = STRBUF_INIT;
 444                 /*
 445                  * Note that we assume we only ever have a single set of
 446                  * credentials in a given program run, so we do not have
 447                  * to worry about updating this buffer, only setting its
 448                  * initial value.
 449                  */
 450                 if (!up.len)
 451                         strbuf_addf(&up, "%s:%s",
 452                                 http_auth.username, http_auth.password);
 453                 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
 454         }
 455 #endif
 456 }
 457
 458 /* *var must be free-able */
 459 static void var_override(const char **var, char *value)
 460 {
 461         if (value) {
 462                 free((void *)*var);
 463                 *var = xstrdup(value);
 464         }
 465 }
 466
 467 static void set_proxyauth_name_password(CURL *result)
 468 {
 469 #if LIBCURL_VERSION_NUM >= 0x071301
 470                 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
 471                         proxy_auth.username);
 472                 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
 473                         proxy_auth.password);
 474 #else
 475                 struct strbuf s = STRBUF_INIT;
 476
 477                 strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
 478                 strbuf_addch(&s, ':');
 479                 strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
 480                 curl_proxyuserpwd = strbuf_detach(&s, NULL);
 481                 curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
 482 #endif
 483 }
 484
 485 static void init_curl_proxy_auth(CURL *result)
 486 {
 487         if (proxy_auth.username) {
 488                 if (!proxy_auth.password)
 489                         credential_fill(&proxy_auth);
 490                 set_proxyauth_name_password(result);
 491         }
 492
 493         var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
 494
 495 #if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
 496         if (http_proxy_authmethod) {
 497                 int i;
 498                 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
 499                         if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
 500                                 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
 501                                                 proxy_authmethods[i].curlauth_param);
 502                                 break;
 503                         }
 504                 }
 505                 if (i == ARRAY_SIZE(proxy_authmethods)) {
 506                         warning("unsupported proxy authentication method %s: using anyauth",
 507                                         http_proxy_authmethod);
 508                         curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 509                 }
 510         }
 511         else
 512                 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 513 #endif
 514 }
 515
 516 static int has_cert_password(void)
 517 {
 518         if (ssl_cert == NULL || ssl_cert_password_required != 1)
 519                 return 0;
 520         if (!cert_auth.password) {
 521                 cert_auth.protocol = xstrdup("cert");
 522                 cert_auth.username = xstrdup("");
 523                 cert_auth.path = xstrdup(ssl_cert);
 524                 credential_fill(&cert_auth);
 525         }
 526         return 1;
 527 }
 528
 529 #if LIBCURL_VERSION_NUM >= 0x071900
 530 static void set_curl_keepalive(CURL *c)
 531 {
 532         curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
 533 }
 534
 535 #elif LIBCURL_VERSION_NUM >= 0x071000
 536 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
 537 {
 538         int ka = 1;
 539         int rc;
 540         socklen_t len = (socklen_t)sizeof(ka);
 541
 542         if (type != CURLSOCKTYPE_IPCXN)
 543                 return 0;
 544
 545         rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
 546         if (rc < 0)
 547                 warning_errno("unable to set SO_KEEPALIVE on socket");
 548
 549         return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
 550 }
 551
 552 static void set_curl_keepalive(CURL *c)
 553 {
 554         curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
 555 }
 556
 557 #else
 558 static void set_curl_keepalive(CURL *c)
 559 {
 560         /* not supported on older curl versions */
 561 }
 562 #endif
 563
 564 static void redact_sensitive_header(struct strbuf *header)
 565 {
 566         const char *sensitive_header;
 567
 568         if (skip_prefix(header->buf, "Authorization:", &sensitive_header) ||
 569             skip_prefix(header->buf, "Proxy-Authorization:", &sensitive_header)) {
 570                 /* The first token is the type, which is OK to log */
 571                 while (isspace(*sensitive_header))
 572                         sensitive_header++;
 573                 while (*sensitive_header && !isspace(*sensitive_header))
 574                         sensitive_header++;
 575                 /* Everything else is opaque and possibly sensitive */
 576                 strbuf_setlen(header,  sensitive_header - header->buf);
 577                 strbuf_addstr(header, " <redacted>");
 578         }
 579 }
 580
 581 static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
 582 {
 583         struct strbuf out = STRBUF_INIT;
 584         struct strbuf **headers, **header;
 585
 586         strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
 587                 text, (long)size, (long)size);
 588         trace_strbuf(&trace_curl, &out);
 589         strbuf_reset(&out);
 590         strbuf_add(&out, ptr, size);
 591         headers = strbuf_split_max(&out, '\n', 0);
 592
 593         for (header = headers; *header; header++) {
 594                 if (hide_sensitive_header)
 595                         redact_sensitive_header(*header);
 596                 strbuf_insert((*header), 0, text, strlen(text));
 597                 strbuf_insert((*header), strlen(text), ": ", 2);
 598                 strbuf_rtrim((*header));
 599                 strbuf_addch((*header), '\n');
 600                 trace_strbuf(&trace_curl, (*header));
 601         }
 602         strbuf_list_free(headers);
 603         strbuf_release(&out);
 604 }
 605
 606 static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
 607 {
 608         size_t i;
 609         struct strbuf out = STRBUF_INIT;
 610         unsigned int width = 60;
 611
 612         strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
 613                 text, (long)size, (long)size);
 614         trace_strbuf(&trace_curl, &out);
 615
 616         for (i = 0; i < size; i += width) {
 617                 size_t w;
 618
 619                 strbuf_reset(&out);
 620                 strbuf_addf(&out, "%s: ", text);
 621                 for (w = 0; (w < width) && (i + w < size); w++) {
 622                         unsigned char ch = ptr[i + w];
 623
 624                         strbuf_addch(&out,
 625                                        (ch >= 0x20) && (ch < 0x80)
 626                                        ? ch : '.');
 627                 }
 628                 strbuf_addch(&out, '\n');
 629                 trace_strbuf(&trace_curl, &out);
 630         }
 631         strbuf_release(&out);
 632 }
 633
 634 static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
 635 {
 636         const char *text;
 637         enum { NO_FILTER = 0, DO_FILTER = 1 };
 638
 639         switch (type) {
 640         case CURLINFO_TEXT:
 641                 trace_printf_key(&trace_curl, "== Info: %s", data);
 642                 break;
 643         case CURLINFO_HEADER_OUT:
 644                 text = "=> Send header";
 645                 curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
 646                 break;
 647         case CURLINFO_DATA_OUT:
 648                 text = "=> Send data";
 649                 curl_dump_data(text, (unsigned char *)data, size);
 650                 break;
 651         case CURLINFO_SSL_DATA_OUT:
 652                 text = "=> Send SSL data";
 653                 curl_dump_data(text, (unsigned char *)data, size);
 654                 break;
 655         case CURLINFO_HEADER_IN:
 656                 text = "<= Recv header";
 657                 curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
 658                 break;
 659         case CURLINFO_DATA_IN:
 660                 text = "<= Recv data";
 661                 curl_dump_data(text, (unsigned char *)data, size);
 662                 break;
 663         case CURLINFO_SSL_DATA_IN:
 664                 text = "<= Recv SSL data";
 665                 curl_dump_data(text, (unsigned char *)data, size);
 666                 break;
 667
 668         default:                /* we ignore unknown types by default */
 669                 return 0;
 670         }
 671         return 0;
 672 }
 673
 674 void setup_curl_trace(CURL *handle)
 675 {
 676         if (!trace_want(&trace_curl))
 677                 return;
 678         curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
 679         curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
 680         curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
 681 }
 682
 683 #ifdef CURLPROTO_HTTP
 684 static long get_curl_allowed_protocols(int from_user)
 685 {
 686         long allowed_protocols = 0;
 687
 688         if (is_transport_allowed("http", from_user))
 689                 allowed_protocols |= CURLPROTO_HTTP;
 690         if (is_transport_allowed("https", from_user))
 691                 allowed_protocols |= CURLPROTO_HTTPS;
 692         if (is_transport_allowed("ftp", from_user))
 693                 allowed_protocols |= CURLPROTO_FTP;
 694         if (is_transport_allowed("ftps", from_user))
 695                 allowed_protocols |= CURLPROTO_FTPS;
 696
 697         return allowed_protocols;
 698 }
 699 #endif
 700
 701 static CURL *get_curl_handle(void)
 702 {
 703         CURL *result = curl_easy_init();
 704
 705         if (!result)
 706                 die("curl_easy_init failed");
 707
 708         if (!curl_ssl_verify) {
 709                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 710                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 711         } else {
 712                 /* Verify authenticity of the peer's certificate */
 713                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 714                 /* The name in the cert must match whom we tried to connect */
 715                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 716         }
 717
 718 #if LIBCURL_VERSION_NUM >= 0x070907
 719         curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 720 #endif
 721 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 722         curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 723 #endif
 724
 725 #ifdef CURLGSSAPI_DELEGATION_FLAG
 726         if (curl_deleg) {
 727                 int i;
 728                 for (i = 0; i < ARRAY_SIZE(curl_deleg_levels); i++) {
 729                         if (!strcmp(curl_deleg, curl_deleg_levels[i].name)) {
 730                                 curl_easy_setopt(result, CURLOPT_GSSAPI_DELEGATION,
 731                                                 curl_deleg_levels[i].curl_deleg_param);
 732                                 break;
 733                         }
 734                 }
 735                 if (i == ARRAY_SIZE(curl_deleg_levels))
 736                         warning("Unknown delegation method '%s': using default",
 737                                 curl_deleg);
 738         }
 739 #endif
 740
 741         if (http_proactive_auth)
 742                 init_curl_http_auth(result);
 743
 744         if (getenv("GIT_SSL_VERSION"))
 745                 ssl_version = getenv("GIT_SSL_VERSION");
 746         if (ssl_version && *ssl_version) {
 747                 int i;
 748                 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
 749                         if (!strcmp(ssl_version, sslversions[i].name)) {
 750                                 curl_easy_setopt(result, CURLOPT_SSLVERSION,
 751                                                  sslversions[i].ssl_version);
 752                                 break;
 753                         }
 754                 }
 755                 if (i == ARRAY_SIZE(sslversions))
 756                         warning("unsupported ssl version %s: using default",
 757                                 ssl_version);
 758         }
 759
 760         if (getenv("GIT_SSL_CIPHER_LIST"))
 761                 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
 762         if (ssl_cipherlist != NULL && *ssl_cipherlist)
 763                 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
 764                                 ssl_cipherlist);
 765
 766         if (ssl_cert != NULL)
 767                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 768         if (has_cert_password())
 769                 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
 770 #if LIBCURL_VERSION_NUM >= 0x070903
 771         if (ssl_key != NULL)
 772                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 773 #endif
 774 #if LIBCURL_VERSION_NUM >= 0x070908
 775         if (ssl_capath != NULL)
 776                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 777 #endif
 778 #if LIBCURL_VERSION_NUM >= 0x072c00
 779         if (ssl_pinnedkey != NULL)
 780                 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
 781 #endif
 782         if (ssl_cainfo != NULL)
 783                 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 784
 785         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 786                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 787                                  curl_low_speed_limit);
 788                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 789                                  curl_low_speed_time);
 790         }
 791
 792         curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
 793 #if LIBCURL_VERSION_NUM >= 0x071301
 794         curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 795 #elif LIBCURL_VERSION_NUM >= 0x071101
 796         curl_easy_setopt(result, CURLOPT_POST301, 1);
 797 #endif
 798 #ifdef CURLPROTO_HTTP
 799         curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS,
 800                          get_curl_allowed_protocols(0));
 801         curl_easy_setopt(result, CURLOPT_PROTOCOLS,
 802                          get_curl_allowed_protocols(-1));
 803 #else
 804         warning("protocol restrictions not applied to curl redirects because\n"
 805                 "your curl version is too old (>= 7.19.4)");
 806 #endif
 807         if (getenv("GIT_CURL_VERBOSE"))
 808                 curl_easy_setopt(result, CURLOPT_VERBOSE, 1L);
 809         setup_curl_trace(result);
 810
 811         curl_easy_setopt(result, CURLOPT_USERAGENT,
 812                 user_agent ? user_agent : git_user_agent());
 813
 814         if (curl_ftp_no_epsv)
 815                 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 816
 817 #ifdef CURLOPT_USE_SSL
 818         if (curl_ssl_try)
 819                 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
 820 #endif
 821
 822         /*
 823          * CURL also examines these variables as a fallback; but we need to query
 824          * them here in order to decide whether to prompt for missing password (cf.
 825          * init_curl_proxy_auth()).
 826          *
 827          * Unlike many other common environment variables, these are historically
 828          * lowercase only. It appears that CURL did not know this and implemented
 829          * only uppercase variants, which was later corrected to take both - with
 830          * the exception of http_proxy, which is lowercase only also in CURL. As
 831          * the lowercase versions are the historical quasi-standard, they take
 832          * precedence here, as in CURL.
 833          */
 834         if (!curl_http_proxy) {
 835                 if (http_auth.protocol && !strcmp(http_auth.protocol, "https")) {
 836                         var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
 837                         var_override(&curl_http_proxy, getenv("https_proxy"));
 838                 } else {
 839                         var_override(&curl_http_proxy, getenv("http_proxy"));
 840                 }
 841                 if (!curl_http_proxy) {
 842                         var_override(&curl_http_proxy, getenv("ALL_PROXY"));
 843                         var_override(&curl_http_proxy, getenv("all_proxy"));
 844                 }
 845         }
 846
 847         if (curl_http_proxy && curl_http_proxy[0] == '\0') {
 848                 /*
 849                  * Handle case with the empty http.proxy value here to keep
 850                  * common code clean.
 851                  * NB: empty option disables proxying at all.
 852                  */
 853                 curl_easy_setopt(result, CURLOPT_PROXY, "");
 854         } else if (curl_http_proxy) {
 855 #if LIBCURL_VERSION_NUM >= 0x071800
 856                 if (starts_with(curl_http_proxy, "socks5h"))
 857                         curl_easy_setopt(result,
 858                                 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
 859                 else if (starts_with(curl_http_proxy, "socks5"))
 860                         curl_easy_setopt(result,
 861                                 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
 862                 else if (starts_with(curl_http_proxy, "socks4a"))
 863                         curl_easy_setopt(result,
 864                                 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
 865                 else if (starts_with(curl_http_proxy, "socks"))
 866                         curl_easy_setopt(result,
 867                                 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
 868 #endif
 869                 if (strstr(curl_http_proxy, "://"))
 870                         credential_from_url(&proxy_auth, curl_http_proxy);
 871                 else {
 872                         struct strbuf url = STRBUF_INIT;
 873                         strbuf_addf(&url, "http://%s", curl_http_proxy);
 874                         credential_from_url(&proxy_auth, url.buf);
 875                         strbuf_release(&url);
 876                 }
 877
 878                 if (!proxy_auth.host)
 879                         die("Invalid proxy URL '%s'", curl_http_proxy);
 880
 881                 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
 882 #if LIBCURL_VERSION_NUM >= 0x071304
 883                 var_override(&curl_no_proxy, getenv("NO_PROXY"));
 884                 var_override(&curl_no_proxy, getenv("no_proxy"));
 885                 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
 886 #endif
 887         }
 888         init_curl_proxy_auth(result);
 889
 890         set_curl_keepalive(result);
 891
 892         return result;
 893 }
 894
 895 static void set_from_env(const char **var, const char *envname)
 896 {
 897         const char *val = getenv(envname);
 898         if (val)
 899                 *var = val;
 900 }
 901
 902 static void protocol_http_header(void)
 903 {
 904         if (get_protocol_version_config() > 0) {
 905                 struct strbuf protocol_header = STRBUF_INIT;
 906
 907                 strbuf_addf(&protocol_header, GIT_PROTOCOL_HEADER ": version=%d",
 908                             get_protocol_version_config());
 909
 910
 911                 extra_http_headers = curl_slist_append(extra_http_headers,
 912                                                        protocol_header.buf);
 913                 strbuf_release(&protocol_header);
 914         }
 915 }
 916
 917 void http_init(struct remote *remote, const char *url, int proactive_auth)
 918 {
 919         char *low_speed_limit;
 920         char *low_speed_time;
 921         char *normalized_url;
 922         struct urlmatch_config config = { STRING_LIST_INIT_DUP };
 923
 924         config.section = "http";
 925         config.key = NULL;
 926         config.collect_fn = http_options;
 927         config.cascade_fn = git_default_config;
 928         config.cb = NULL;
 929
 930         http_is_verbose = 0;
 931         normalized_url = url_normalize(url, &config.url);
 932
 933         git_config(urlmatch_config_entry, &config);
 934         free(normalized_url);
 935
 936         if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
 937                 die("curl_global_init failed");
 938
 939         http_proactive_auth = proactive_auth;
 940
 941         if (remote && remote->http_proxy)
 942                 curl_http_proxy = xstrdup(remote->http_proxy);
 943
 944         if (remote)
 945                 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
 946
 947         protocol_http_header();
 948
 949         pragma_header = curl_slist_append(http_copy_default_headers(),
 950                 "Pragma: no-cache");
 951         no_pragma_header = curl_slist_append(http_copy_default_headers(),
 952                 "Pragma:");
 953
 954 #ifdef USE_CURL_MULTI
 955         {
 956                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 957                 if (http_max_requests != NULL)
 958                         max_requests = atoi(http_max_requests);
 959         }
 960
 961         curlm = curl_multi_init();
 962         if (!curlm)
 963                 die("curl_multi_init failed");
 964 #endif
 965
 966         if (getenv("GIT_SSL_NO_VERIFY"))
 967                 curl_ssl_verify = 0;
 968
 969         set_from_env(&ssl_cert, "GIT_SSL_CERT");
 970 #if LIBCURL_VERSION_NUM >= 0x070903
 971         set_from_env(&ssl_key, "GIT_SSL_KEY");
 972 #endif
 973 #if LIBCURL_VERSION_NUM >= 0x070908
 974         set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 975 #endif
 976         set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 977
 978         set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 979
 980         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 981         if (low_speed_limit != NULL)
 982                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 983         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 984         if (low_speed_time != NULL)
 985                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 986
 987         if (curl_ssl_verify == -1)
 988                 curl_ssl_verify = 1;
 989
 990         curl_session_count = 0;
 991 #ifdef USE_CURL_MULTI
 992         if (max_requests < 1)
 993                 max_requests = DEFAULT_MAX_REQUESTS;
 994 #endif
 995
 996         if (getenv("GIT_CURL_FTP_NO_EPSV"))
 997                 curl_ftp_no_epsv = 1;
 998
 999         if (url) {
1000                 credential_from_url(&http_auth, url);
1001                 if (!ssl_cert_password_required &&
1002                     getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
1003                     starts_with(url, "https://"))
1004                         ssl_cert_password_required = 1;
1005         }
1006
1007 #ifndef NO_CURL_EASY_DUPHANDLE
1008         curl_default = get_curl_handle();
1009 #endif
1010 }
1011
1012 void http_cleanup(void)
1013 {
1014         struct active_request_slot *slot = active_queue_head;
1015
1016         while (slot != NULL) {
1017                 struct active_request_slot *next = slot->next;
1018                 if (slot->curl != NULL) {
1019                         xmulti_remove_handle(slot);
1020                         curl_easy_cleanup(slot->curl);
1021                 }
1022                 free(slot);
1023                 slot = next;
1024         }
1025         active_queue_head = NULL;
1026
1027 #ifndef NO_CURL_EASY_DUPHANDLE
1028         curl_easy_cleanup(curl_default);
1029 #endif
1030
1031 #ifdef USE_CURL_MULTI
1032         curl_multi_cleanup(curlm);
1033 #endif
1034         curl_global_cleanup();
1035
1036         curl_slist_free_all(extra_http_headers);
1037         extra_http_headers = NULL;
1038
1039         curl_slist_free_all(pragma_header);
1040         pragma_header = NULL;
1041
1042         curl_slist_free_all(no_pragma_header);
1043         no_pragma_header = NULL;
1044
1045         if (curl_http_proxy) {
1046                 free((void *)curl_http_proxy);
1047                 curl_http_proxy = NULL;
1048         }
1049
1050         if (proxy_auth.password) {
1051                 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
1052                 FREE_AND_NULL(proxy_auth.password);
1053         }
1054
1055         free((void *)curl_proxyuserpwd);
1056         curl_proxyuserpwd = NULL;
1057
1058         free((void *)http_proxy_authmethod);
1059         http_proxy_authmethod = NULL;
1060
1061         if (cert_auth.password != NULL) {
1062                 memset(cert_auth.password, 0, strlen(cert_auth.password));
1063                 FREE_AND_NULL(cert_auth.password);
1064         }
1065         ssl_cert_password_required = 0;
1066
1067         FREE_AND_NULL(cached_accept_language);
1068 }
1069
1070 struct active_request_slot *get_active_slot(void)
1071 {
1072         struct active_request_slot *slot = active_queue_head;
1073         struct active_request_slot *newslot;
1074
1075 #ifdef USE_CURL_MULTI
1076         int num_transfers;
1077
1078         /* Wait for a slot to open up if the queue is full */
1079         while (active_requests >= max_requests) {
1080                 curl_multi_perform(curlm, &num_transfers);
1081                 if (num_transfers < active_requests)
1082                         process_curl_messages();
1083         }
1084 #endif
1085
1086         while (slot != NULL && slot->in_use)
1087                 slot = slot->next;
1088
1089         if (slot == NULL) {
1090                 newslot = xmalloc(sizeof(*newslot));
1091                 newslot->curl = NULL;
1092                 newslot->in_use = 0;
1093                 newslot->next = NULL;
1094
1095                 slot = active_queue_head;
1096                 if (slot == NULL) {
1097                         active_queue_head = newslot;
1098                 } else {
1099                         while (slot->next != NULL)
1100                                 slot = slot->next;
1101                         slot->next = newslot;
1102                 }
1103                 slot = newslot;
1104         }
1105
1106         if (slot->curl == NULL) {
1107 #ifdef NO_CURL_EASY_DUPHANDLE
1108                 slot->curl = get_curl_handle();
1109 #else
1110                 slot->curl = curl_easy_duphandle(curl_default);
1111 #endif
1112                 curl_session_count++;
1113         }
1114
1115         active_requests++;
1116         slot->in_use = 1;
1117         slot->results = NULL;
1118         slot->finished = NULL;
1119         slot->callback_data = NULL;
1120         slot->callback_func = NULL;
1121         curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1122         if (curl_save_cookies)
1123                 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1124         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1125         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1126         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1127         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1128         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1129         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1130         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1131         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1132         curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1133         curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1134
1135         /*
1136          * Default following to off unless "ALWAYS" is configured; this gives
1137          * callers a sane starting point, and they can tweak for individual
1138          * HTTP_FOLLOW_* cases themselves.
1139          */
1140         if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1141                 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1142         else
1143                 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1144
1145 #if LIBCURL_VERSION_NUM >= 0x070a08
1146         curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1147 #endif
1148 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1149         curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1150 #endif
1151         if (http_auth.password || curl_empty_auth_enabled())
1152                 init_curl_http_auth(slot->curl);
1153
1154         return slot;
1155 }
1156
1157 int start_active_slot(struct active_request_slot *slot)
1158 {
1159 #ifdef USE_CURL_MULTI
1160         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1161         int num_transfers;
1162
1163         if (curlm_result != CURLM_OK &&
1164             curlm_result != CURLM_CALL_MULTI_PERFORM) {
1165                 warning("curl_multi_add_handle failed: %s",
1166                         curl_multi_strerror(curlm_result));
1167                 active_requests--;
1168                 slot->in_use = 0;
1169                 return 0;
1170         }
1171
1172         /*
1173          * We know there must be something to do, since we just added
1174          * something.
1175          */
1176         curl_multi_perform(curlm, &num_transfers);
1177 #endif
1178         return 1;
1179 }
1180
1181 #ifdef USE_CURL_MULTI
1182 struct fill_chain {
1183         void *data;
1184         int (*fill)(void *);
1185         struct fill_chain *next;
1186 };
1187
1188 static struct fill_chain *fill_cfg;
1189
1190 void add_fill_function(void *data, int (*fill)(void *))
1191 {
1192         struct fill_chain *new = xmalloc(sizeof(*new));
1193         struct fill_chain **linkp = &fill_cfg;
1194         new->data = data;
1195         new->fill = fill;
1196         new->next = NULL;
1197         while (*linkp)
1198                 linkp = &(*linkp)->next;
1199         *linkp = new;
1200 }
1201
1202 void fill_active_slots(void)
1203 {
1204         struct active_request_slot *slot = active_queue_head;
1205
1206         while (active_requests < max_requests) {
1207                 struct fill_chain *fill;
1208                 for (fill = fill_cfg; fill; fill = fill->next)
1209                         if (fill->fill(fill->data))
1210                                 break;
1211
1212                 if (!fill)
1213                         break;
1214         }
1215
1216         while (slot != NULL) {
1217                 if (!slot->in_use && slot->curl != NULL
1218                         && curl_session_count > min_curl_sessions) {
1219                         curl_easy_cleanup(slot->curl);
1220                         slot->curl = NULL;
1221                         curl_session_count--;
1222                 }
1223                 slot = slot->next;
1224         }
1225 }
1226
1227 void step_active_slots(void)
1228 {
1229         int num_transfers;
1230         CURLMcode curlm_result;
1231
1232         do {
1233                 curlm_result = curl_multi_perform(curlm, &num_transfers);
1234         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1235         if (num_transfers < active_requests) {
1236                 process_curl_messages();
1237                 fill_active_slots();
1238         }
1239 }
1240 #endif
1241
1242 void run_active_slot(struct active_request_slot *slot)
1243 {
1244 #ifdef USE_CURL_MULTI
1245         fd_set readfds;
1246         fd_set writefds;
1247         fd_set excfds;
1248         int max_fd;
1249         struct timeval select_timeout;
1250         int finished = 0;
1251
1252         slot->finished = &finished;
1253         while (!finished) {
1254                 step_active_slots();
1255
1256                 if (slot->in_use) {
1257 #if LIBCURL_VERSION_NUM >= 0x070f04
1258                         long curl_timeout;
1259                         curl_multi_timeout(curlm, &curl_timeout);
1260                         if (curl_timeout == 0) {
1261                                 continue;
1262                         } else if (curl_timeout == -1) {
1263                                 select_timeout.tv_sec  = 0;
1264                                 select_timeout.tv_usec = 50000;
1265                         } else {
1266                                 select_timeout.tv_sec  =  curl_timeout / 1000;
1267                                 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1268                         }
1269 #else
1270                         select_timeout.tv_sec  = 0;
1271                         select_timeout.tv_usec = 50000;
1272 #endif
1273
1274                         max_fd = -1;
1275                         FD_ZERO(&readfds);
1276                         FD_ZERO(&writefds);
1277                         FD_ZERO(&excfds);
1278                         curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1279
1280                         /*
1281                          * It can happen that curl_multi_timeout returns a pathologically
1282                          * long timeout when curl_multi_fdset returns no file descriptors
1283                          * to read.  See commit message for more details.
1284                          */
1285                         if (max_fd < 0 &&
1286                             (select_timeout.tv_sec > 0 ||
1287                              select_timeout.tv_usec > 50000)) {
1288                                 select_timeout.tv_sec  = 0;
1289                                 select_timeout.tv_usec = 50000;
1290                         }
1291
1292                         select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1293                 }
1294         }
1295 #else
1296         while (slot->in_use) {
1297                 slot->curl_result = curl_easy_perform(slot->curl);
1298                 finish_active_slot(slot);
1299         }
1300 #endif
1301 }
1302
1303 static void release_active_slot(struct active_request_slot *slot)
1304 {
1305         closedown_active_slot(slot);
1306         if (slot->curl) {
1307                 xmulti_remove_handle(slot);
1308                 if (curl_session_count > min_curl_sessions) {
1309                         curl_easy_cleanup(slot->curl);
1310                         slot->curl = NULL;
1311                         curl_session_count--;
1312                 }
1313         }
1314 #ifdef USE_CURL_MULTI
1315         fill_active_slots();
1316 #endif
1317 }
1318
1319 void finish_all_active_slots(void)
1320 {
1321         struct active_request_slot *slot = active_queue_head;
1322
1323         while (slot != NULL)
1324                 if (slot->in_use) {
1325                         run_active_slot(slot);
1326                         slot = active_queue_head;
1327                 } else {
1328                         slot = slot->next;
1329                 }
1330 }
1331
1332 /* Helpers for modifying and creating URLs */
1333 static inline int needs_quote(int ch)
1334 {
1335         if (((ch >= 'A') && (ch <= 'Z'))
1336                         || ((ch >= 'a') && (ch <= 'z'))
1337                         || ((ch >= '0') && (ch <= '9'))
1338                         || (ch == '/')
1339                         || (ch == '-')
1340                         || (ch == '.'))
1341                 return 0;
1342         return 1;
1343 }
1344
1345 static char *quote_ref_url(const char *base, const char *ref)
1346 {
1347         struct strbuf buf = STRBUF_INIT;
1348         const char *cp;
1349         int ch;
1350
1351         end_url_with_slash(&buf, base);
1352
1353         for (cp = ref; (ch = *cp) != 0; cp++)
1354                 if (needs_quote(ch))
1355                         strbuf_addf(&buf, "%%%02x", ch);
1356                 else
1357                         strbuf_addch(&buf, *cp);
1358
1359         return strbuf_detach(&buf, NULL);
1360 }
1361
1362 void append_remote_object_url(struct strbuf *buf, const char *url,
1363                               const char *hex,
1364                               int only_two_digit_prefix)
1365 {
1366         end_url_with_slash(buf, url);
1367
1368         strbuf_addf(buf, "objects/%.*s/", 2, hex);
1369         if (!only_two_digit_prefix)
1370                 strbuf_addstr(buf, hex + 2);
1371 }
1372
1373 char *get_remote_object_url(const char *url, const char *hex,
1374                             int only_two_digit_prefix)
1375 {
1376         struct strbuf buf = STRBUF_INIT;
1377         append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1378         return strbuf_detach(&buf, NULL);
1379 }
1380
1381 static int handle_curl_result(struct slot_results *results)
1382 {
1383         /*
1384          * If we see a failing http code with CURLE_OK, we have turned off
1385          * FAILONERROR (to keep the server's custom error response), and should
1386          * translate the code into failure here.
1387          *
1388          * Likewise, if we see a redirect (30x code), that means we turned off
1389          * redirect-following, and we should treat the result as an error.
1390          */
1391         if (results->curl_result == CURLE_OK &&
1392             results->http_code >= 300) {
1393                 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1394                 /*
1395                  * Normally curl will already have put the "reason phrase"
1396                  * from the server into curl_errorstr; unfortunately without
1397                  * FAILONERROR it is lost, so we can give only the numeric
1398                  * status code.
1399                  */
1400                 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1401                           "The requested URL returned error: %ld",
1402                           results->http_code);
1403         }
1404
1405         if (results->curl_result == CURLE_OK) {
1406                 credential_approve(&http_auth);
1407                 if (proxy_auth.password)
1408                         credential_approve(&proxy_auth);
1409                 return HTTP_OK;
1410         } else if (missing_target(results))
1411                 return HTTP_MISSING_TARGET;
1412         else if (results->http_code == 401) {
1413                 if (http_auth.username && http_auth.password) {
1414                         credential_reject(&http_auth);
1415                         return HTTP_NOAUTH;
1416                 } else {
1417 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1418                         http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1419                         if (results->auth_avail) {
1420                                 http_auth_methods &= results->auth_avail;
1421                                 http_auth_methods_restricted = 1;
1422                         }
1423 #endif
1424                         return HTTP_REAUTH;
1425                 }
1426         } else {
1427                 if (results->http_connectcode == 407)
1428                         credential_reject(&proxy_auth);
1429 #if LIBCURL_VERSION_NUM >= 0x070c00
1430                 if (!curl_errorstr[0])
1431                         strlcpy(curl_errorstr,
1432                                 curl_easy_strerror(results->curl_result),
1433                                 sizeof(curl_errorstr));
1434 #endif
1435                 return HTTP_ERROR;
1436         }
1437 }
1438
1439 int run_one_slot(struct active_request_slot *slot,
1440                  struct slot_results *results)
1441 {
1442         slot->results = results;
1443         if (!start_active_slot(slot)) {
1444                 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1445                           "failed to start HTTP request");
1446                 return HTTP_START_FAILED;
1447         }
1448
1449         run_active_slot(slot);
1450         return handle_curl_result(results);
1451 }
1452
1453 struct curl_slist *http_copy_default_headers(void)
1454 {
1455         struct curl_slist *headers = NULL, *h;
1456
1457         for (h = extra_http_headers; h; h = h->next)
1458                 headers = curl_slist_append(headers, h->data);
1459
1460         return headers;
1461 }
1462
1463 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1464 {
1465         char *ptr;
1466         CURLcode ret;
1467
1468         strbuf_reset(buf);
1469         ret = curl_easy_getinfo(curl, info, &ptr);
1470         if (!ret && ptr)
1471                 strbuf_addstr(buf, ptr);
1472         return ret;
1473 }
1474
1475 /*
1476  * Check for and extract a content-type parameter. "raw"
1477  * should be positioned at the start of the potential
1478  * parameter, with any whitespace already removed.
1479  *
1480  * "name" is the name of the parameter. The value is appended
1481  * to "out".
1482  */
1483 static int extract_param(const char *raw, const char *name,
1484                          struct strbuf *out)
1485 {
1486         size_t len = strlen(name);
1487
1488         if (strncasecmp(raw, name, len))
1489                 return -1;
1490         raw += len;
1491
1492         if (*raw != '=')
1493                 return -1;
1494         raw++;
1495
1496         while (*raw && !isspace(*raw) && *raw != ';')
1497                 strbuf_addch(out, *raw++);
1498         return 0;
1499 }
1500
1501 /*
1502  * Extract a normalized version of the content type, with any
1503  * spaces suppressed, all letters lowercased, and no trailing ";"
1504  * or parameters.
1505  *
1506  * Note that we will silently remove even invalid whitespace. For
1507  * example, "text / plain" is specifically forbidden by RFC 2616,
1508  * but "text/plain" is the only reasonable output, and this keeps
1509  * our code simple.
1510  *
1511  * If the "charset" argument is not NULL, store the value of any
1512  * charset parameter there.
1513  *
1514  * Example:
1515  *   "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1516  *   "text / plain" -> "text/plain"
1517  */
1518 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1519                                  struct strbuf *charset)
1520 {
1521         const char *p;
1522
1523         strbuf_reset(type);
1524         strbuf_grow(type, raw->len);
1525         for (p = raw->buf; *p; p++) {
1526                 if (isspace(*p))
1527                         continue;
1528                 if (*p == ';') {
1529                         p++;
1530                         break;
1531                 }
1532                 strbuf_addch(type, tolower(*p));
1533         }
1534
1535         if (!charset)
1536                 return;
1537
1538         strbuf_reset(charset);
1539         while (*p) {
1540                 while (isspace(*p) || *p == ';')
1541                         p++;
1542                 if (!extract_param(p, "charset", charset))
1543                         return;
1544                 while (*p && !isspace(*p))
1545                         p++;
1546         }
1547
1548         if (!charset->len && starts_with(type->buf, "text/"))
1549                 strbuf_addstr(charset, "ISO-8859-1");
1550 }
1551
1552 static void write_accept_language(struct strbuf *buf)
1553 {
1554         /*
1555          * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1556          * that, q-value will be smaller than 0.001, the minimum q-value the
1557          * HTTP specification allows. See
1558          * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1559          */
1560         const int MAX_DECIMAL_PLACES = 3;
1561         const int MAX_LANGUAGE_TAGS = 1000;
1562         const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1563         char **language_tags = NULL;
1564         int num_langs = 0;
1565         const char *s = get_preferred_languages();
1566         int i;
1567         struct strbuf tag = STRBUF_INIT;
1568
1569         /* Don't add Accept-Language header if no language is preferred. */
1570         if (!s)
1571                 return;
1572
1573         /*
1574          * Split the colon-separated string of preferred languages into
1575          * language_tags array.
1576          */
1577         do {
1578                 /* collect language tag */
1579                 for (; *s && (isalnum(*s) || *s == '_'); s++)
1580                         strbuf_addch(&tag, *s == '_' ? '-' : *s);
1581
1582                 /* skip .codeset, @modifier and any other unnecessary parts */
1583                 while (*s && *s != ':')
1584                         s++;
1585
1586                 if (tag.len) {
1587                         num_langs++;
1588                         REALLOC_ARRAY(language_tags, num_langs);
1589                         language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1590                         if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1591                                 break;
1592                 }
1593         } while (*s++);
1594
1595         /* write Accept-Language header into buf */
1596         if (num_langs) {
1597                 int last_buf_len = 0;
1598                 int max_q;
1599                 int decimal_places;
1600                 char q_format[32];
1601
1602                 /* add '*' */
1603                 REALLOC_ARRAY(language_tags, num_langs + 1);
1604                 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1605
1606                 /* compute decimal_places */
1607                 for (max_q = 1, decimal_places = 0;
1608                      max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1609                      decimal_places++, max_q *= 10)
1610                         ;
1611
1612                 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1613
1614                 strbuf_addstr(buf, "Accept-Language: ");
1615
1616                 for (i = 0; i < num_langs; i++) {
1617                         if (i > 0)
1618                                 strbuf_addstr(buf, ", ");
1619
1620                         strbuf_addstr(buf, language_tags[i]);
1621
1622                         if (i > 0)
1623                                 strbuf_addf(buf, q_format, max_q - i);
1624
1625                         if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1626                                 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1627                                 break;
1628                         }
1629
1630                         last_buf_len = buf->len;
1631                 }
1632         }
1633
1634         /* free language tags -- last one is a static '*' */
1635         for (i = 0; i < num_langs - 1; i++)
1636                 free(language_tags[i]);
1637         free(language_tags);
1638 }
1639
1640 /*
1641  * Get an Accept-Language header which indicates user's preferred languages.
1642  *
1643  * Examples:
1644  *   LANGUAGE= -> ""
1645  *   LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1646  *   LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1647  *   LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1648  *   LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1649  *   LANGUAGE= LANG=C -> ""
1650  */
1651 static const char *get_accept_language(void)
1652 {
1653         if (!cached_accept_language) {
1654                 struct strbuf buf = STRBUF_INIT;
1655                 write_accept_language(&buf);
1656                 if (buf.len > 0)
1657                         cached_accept_language = strbuf_detach(&buf, NULL);
1658         }
1659
1660         return cached_accept_language;
1661 }
1662
1663 static void http_opt_request_remainder(CURL *curl, off_t pos)
1664 {
1665         char buf[128];
1666         xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1667         curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1668 }
1669
1670 /* http_request() targets */
1671 #define HTTP_REQUEST_STRBUF     0
1672 #define HTTP_REQUEST_FILE       1
1673
1674 static int http_request(const char *url,
1675                         void *result, int target,
1676                         const struct http_get_options *options)
1677 {
1678         struct active_request_slot *slot;
1679         struct slot_results results;
1680         struct curl_slist *headers = http_copy_default_headers();
1681         struct strbuf buf = STRBUF_INIT;
1682         const char *accept_language;
1683         int ret;
1684
1685         slot = get_active_slot();
1686         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1687
1688         if (result == NULL) {
1689                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1690         } else {
1691                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1692                 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1693
1694                 if (target == HTTP_REQUEST_FILE) {
1695                         off_t posn = ftello(result);
1696                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1697                                          fwrite);
1698                         if (posn > 0)
1699                                 http_opt_request_remainder(slot->curl, posn);
1700                 } else
1701                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1702                                          fwrite_buffer);
1703         }
1704
1705         accept_language = get_accept_language();
1706
1707         if (accept_language)
1708                 headers = curl_slist_append(headers, accept_language);
1709
1710         strbuf_addstr(&buf, "Pragma:");
1711         if (options && options->no_cache)
1712                 strbuf_addstr(&buf, " no-cache");
1713         if (options && options->keep_error)
1714                 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1715         if (options && options->initial_request &&
1716             http_follow_config == HTTP_FOLLOW_INITIAL)
1717                 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1718
1719         headers = curl_slist_append(headers, buf.buf);
1720
1721         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1722         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1723         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1724
1725         ret = run_one_slot(slot, &results);
1726
1727         if (options && options->content_type) {
1728                 struct strbuf raw = STRBUF_INIT;
1729                 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1730                 extract_content_type(&raw, options->content_type,
1731                                      options->charset);
1732                 strbuf_release(&raw);
1733         }
1734
1735         if (options && options->effective_url)
1736                 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1737                                 options->effective_url);
1738
1739         curl_slist_free_all(headers);
1740         strbuf_release(&buf);
1741
1742         return ret;
1743 }
1744
1745 /*
1746  * Update the "base" url to a more appropriate value, as deduced by
1747  * redirects seen when requesting a URL starting with "url".
1748  *
1749  * The "asked" parameter is a URL that we asked curl to access, and must begin
1750  * with "base".
1751  *
1752  * The "got" parameter is the URL that curl reported to us as where we ended
1753  * up.
1754  *
1755  * Returns 1 if we updated the base url, 0 otherwise.
1756  *
1757  * Our basic strategy is to compare "base" and "asked" to find the bits
1758  * specific to our request. We then strip those bits off of "got" to yield the
1759  * new base. So for example, if our base is "http://example.com/foo.git",
1760  * and we ask for "http://example.com/foo.git/info/refs", we might end up
1761  * with "https://other.example.com/foo.git/info/refs". We would want the
1762  * new URL to become "https://other.example.com/foo.git".
1763  *
1764  * Note that this assumes a sane redirect scheme. It's entirely possible
1765  * in the example above to end up at a URL that does not even end in
1766  * "info/refs".  In such a case we die. There's not much we can do, such a
1767  * scheme is unlikely to represent a real git repository, and failing to
1768  * rewrite the base opens options for malicious redirects to do funny things.
1769  */
1770 static int update_url_from_redirect(struct strbuf *base,
1771                                     const char *asked,
1772                                     const struct strbuf *got)
1773 {
1774         const char *tail;
1775         size_t new_len;
1776
1777         if (!strcmp(asked, got->buf))
1778                 return 0;
1779
1780         if (!skip_prefix(asked, base->buf, &tail))
1781                 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1782                     asked, base->buf);
1783
1784         new_len = got->len;
1785         if (!strip_suffix_mem(got->buf, &new_len, tail))
1786                 die(_("unable to update url base from redirection:\n"
1787                       "  asked for: %s\n"
1788                       "   redirect: %s"),
1789                     asked, got->buf);
1790
1791         strbuf_reset(base);
1792         strbuf_add(base, got->buf, new_len);
1793
1794         return 1;
1795 }
1796
1797 static int http_request_reauth(const char *url,
1798                                void *result, int target,
1799                                struct http_get_options *options)
1800 {
1801         int ret = http_request(url, result, target, options);
1802
1803         if (ret != HTTP_OK && ret != HTTP_REAUTH)
1804                 return ret;
1805
1806         if (options && options->effective_url && options->base_url) {
1807                 if (update_url_from_redirect(options->base_url,
1808                                              url, options->effective_url)) {
1809                         credential_from_url(&http_auth, options->base_url->buf);
1810                         url = options->effective_url->buf;
1811                 }
1812         }
1813
1814         if (ret != HTTP_REAUTH)
1815                 return ret;
1816
1817         /*
1818          * If we are using KEEP_ERROR, the previous request may have
1819          * put cruft into our output stream; we should clear it out before
1820          * making our next request. We only know how to do this for
1821          * the strbuf case, but that is enough to satisfy current callers.
1822          */
1823         if (options && options->keep_error) {
1824                 switch (target) {
1825                 case HTTP_REQUEST_STRBUF:
1826                         strbuf_reset(result);
1827                         break;
1828                 default:
1829                         die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1830                 }
1831         }
1832
1833         credential_fill(&http_auth);
1834
1835         return http_request(url, result, target, options);
1836 }
1837
1838 int http_get_strbuf(const char *url,
1839                     struct strbuf *result,
1840                     struct http_get_options *options)
1841 {
1842         return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1843 }
1844
1845 /*
1846  * Downloads a URL and stores the result in the given file.
1847  *
1848  * If a previous interrupted download is detected (i.e. a previous temporary
1849  * file is still around) the download is resumed.
1850  */
1851 static int http_get_file(const char *url, const char *filename,
1852                          struct http_get_options *options)
1853 {
1854         int ret;
1855         struct strbuf tmpfile = STRBUF_INIT;
1856         FILE *result;
1857
1858         strbuf_addf(&tmpfile, "%s.temp", filename);
1859         result = fopen(tmpfile.buf, "a");
1860         if (!result) {
1861                 error("Unable to open local file %s", tmpfile.buf);
1862                 ret = HTTP_ERROR;
1863                 goto cleanup;
1864         }
1865
1866         ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1867         fclose(result);
1868
1869         if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1870                 ret = HTTP_ERROR;
1871 cleanup:
1872         strbuf_release(&tmpfile);
1873         return ret;
1874 }
1875
1876 int http_fetch_ref(const char *base, struct ref *ref)
1877 {
1878         struct http_get_options options = {0};
1879         char *url;
1880         struct strbuf buffer = STRBUF_INIT;
1881         int ret = -1;
1882
1883         options.no_cache = 1;
1884
1885         url = quote_ref_url(base, ref->name);
1886         if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1887                 strbuf_rtrim(&buffer);
1888                 if (buffer.len == 40)
1889                         ret = get_oid_hex(buffer.buf, &ref->old_oid);
1890                 else if (starts_with(buffer.buf, "ref: ")) {
1891                         ref->symref = xstrdup(buffer.buf + 5);
1892                         ret = 0;
1893                 }
1894         }
1895
1896         strbuf_release(&buffer);
1897         free(url);
1898         return ret;
1899 }
1900
1901 /* Helpers for fetching packs */
1902 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1903 {
1904         char *url, *tmp;
1905         struct strbuf buf = STRBUF_INIT;
1906
1907         if (http_is_verbose)
1908                 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1909
1910         end_url_with_slash(&buf, base_url);
1911         strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1912         url = strbuf_detach(&buf, NULL);
1913
1914         strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1915         tmp = strbuf_detach(&buf, NULL);
1916
1917         if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1918                 error("Unable to get pack index %s", url);
1919                 FREE_AND_NULL(tmp);
1920         }
1921
1922         free(url);
1923         return tmp;
1924 }
1925
1926 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1927         unsigned char *sha1, const char *base_url)
1928 {
1929         struct packed_git *new_pack;
1930         char *tmp_idx = NULL;
1931         int ret;
1932
1933         if (has_pack_index(sha1)) {
1934                 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1935                 if (!new_pack)
1936                         return -1; /* parse_pack_index() already issued error message */
1937                 goto add_pack;
1938         }
1939
1940         tmp_idx = fetch_pack_index(sha1, base_url);
1941         if (!tmp_idx)
1942                 return -1;
1943
1944         new_pack = parse_pack_index(sha1, tmp_idx);
1945         if (!new_pack) {
1946                 unlink(tmp_idx);
1947                 free(tmp_idx);
1948
1949                 return -1; /* parse_pack_index() already issued error message */
1950         }
1951
1952         ret = verify_pack_index(new_pack);
1953         if (!ret) {
1954                 close_pack_index(new_pack);
1955                 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1956         }
1957         free(tmp_idx);
1958         if (ret)
1959                 return -1;
1960
1961 add_pack:
1962         new_pack->next = *packs_head;
1963         *packs_head = new_pack;
1964         return 0;
1965 }
1966
1967 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1968 {
1969         struct http_get_options options = {0};
1970         int ret = 0, i = 0;
1971         char *url, *data;
1972         struct strbuf buf = STRBUF_INIT;
1973         unsigned char sha1[20];
1974
1975         end_url_with_slash(&buf, base_url);
1976         strbuf_addstr(&buf, "objects/info/packs");
1977         url = strbuf_detach(&buf, NULL);
1978
1979         options.no_cache = 1;
1980         ret = http_get_strbuf(url, &buf, &options);
1981         if (ret != HTTP_OK)
1982                 goto cleanup;
1983
1984         data = buf.buf;
1985         while (i < buf.len) {
1986                 switch (data[i]) {
1987                 case 'P':
1988                         i++;
1989                         if (i + 52 <= buf.len &&
1990                             starts_with(data + i, " pack-") &&
1991                             starts_with(data + i + 46, ".pack\n")) {
1992                                 get_sha1_hex(data + i + 6, sha1);
1993                                 fetch_and_setup_pack_index(packs_head, sha1,
1994                                                       base_url);
1995                                 i += 51;
1996                                 break;
1997                         }
1998                 default:
1999                         while (i < buf.len && data[i] != '\n')
2000                                 i++;
2001                 }
2002                 i++;
2003         }
2004
2005 cleanup:
2006         free(url);
2007         return ret;
2008 }
2009
2010 void release_http_pack_request(struct http_pack_request *preq)
2011 {
2012         if (preq->packfile != NULL) {
2013                 fclose(preq->packfile);
2014                 preq->packfile = NULL;
2015         }
2016         preq->slot = NULL;
2017         free(preq->url);
2018         free(preq);
2019 }
2020
2021 int finish_http_pack_request(struct http_pack_request *preq)
2022 {
2023         struct packed_git **lst;
2024         struct packed_git *p = preq->target;
2025         char *tmp_idx;
2026         size_t len;
2027         struct child_process ip = CHILD_PROCESS_INIT;
2028         const char *ip_argv[8];
2029
2030         close_pack_index(p);
2031
2032         fclose(preq->packfile);
2033         preq->packfile = NULL;
2034
2035         lst = preq->lst;
2036         while (*lst != p)
2037                 lst = &((*lst)->next);
2038         *lst = (*lst)->next;
2039
2040         if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
2041                 die("BUG: pack tmpfile does not end in .pack.temp?");
2042         tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
2043
2044         ip_argv[0] = "index-pack";
2045         ip_argv[1] = "-o";
2046         ip_argv[2] = tmp_idx;
2047         ip_argv[3] = preq->tmpfile;
2048         ip_argv[4] = NULL;
2049
2050         ip.argv = ip_argv;
2051         ip.git_cmd = 1;
2052         ip.no_stdin = 1;
2053         ip.no_stdout = 1;
2054
2055         if (run_command(&ip)) {
2056                 unlink(preq->tmpfile);
2057                 unlink(tmp_idx);
2058                 free(tmp_idx);
2059                 return -1;
2060         }
2061
2062         unlink(sha1_pack_index_name(p->sha1));
2063
2064         if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
2065          || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
2066                 free(tmp_idx);
2067                 return -1;
2068         }
2069
2070         install_packed_git(p);
2071         free(tmp_idx);
2072         return 0;
2073 }
2074
2075 struct http_pack_request *new_http_pack_request(
2076         struct packed_git *target, const char *base_url)
2077 {
2078         off_t prev_posn = 0;
2079         struct strbuf buf = STRBUF_INIT;
2080         struct http_pack_request *preq;
2081
2082         preq = xcalloc(1, sizeof(*preq));
2083         preq->target = target;
2084
2085         end_url_with_slash(&buf, base_url);
2086         strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2087                 sha1_to_hex(target->sha1));
2088         preq->url = strbuf_detach(&buf, NULL);
2089
2090         snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
2091                 sha1_pack_name(target->sha1));
2092         preq->packfile = fopen(preq->tmpfile, "a");
2093         if (!preq->packfile) {
2094                 error("Unable to open local file %s for pack",
2095                       preq->tmpfile);
2096                 goto abort;
2097         }
2098
2099         preq->slot = get_active_slot();
2100         curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
2101         curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2102         curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2103         curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
2104                 no_pragma_header);
2105
2106         /*
2107          * If there is data present from a previous transfer attempt,
2108          * resume where it left off
2109          */
2110         prev_posn = ftello(preq->packfile);
2111         if (prev_posn>0) {
2112                 if (http_is_verbose)
2113                         fprintf(stderr,
2114                                 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2115                                 sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
2116                 http_opt_request_remainder(preq->slot->curl, prev_posn);
2117         }
2118
2119         return preq;
2120
2121 abort:
2122         free(preq->url);
2123         free(preq);
2124         return NULL;
2125 }
2126
2127 /* Helpers for fetching objects (loose) */
2128 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2129                                void *data)
2130 {
2131         unsigned char expn[4096];
2132         size_t size = eltsize * nmemb;
2133         int posn = 0;
2134         struct http_object_request *freq = data;
2135         struct active_request_slot *slot = freq->slot;
2136
2137         if (slot) {
2138                 CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2139                                                 &slot->http_code);
2140                 if (c != CURLE_OK)
2141                         die("BUG: curl_easy_getinfo for HTTP code failed: %s",
2142                                 curl_easy_strerror(c));
2143                 if (slot->http_code >= 300)
2144                         return size;
2145         }
2146
2147         do {
2148                 ssize_t retval = xwrite(freq->localfile,
2149                                         (char *) ptr + posn, size - posn);
2150                 if (retval < 0)
2151                         return posn;
2152                 posn += retval;
2153         } while (posn < size);
2154
2155         freq->stream.avail_in = size;
2156         freq->stream.next_in = (void *)ptr;
2157         do {
2158                 freq->stream.next_out = expn;
2159                 freq->stream.avail_out = sizeof(expn);
2160                 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2161                 git_SHA1_Update(&freq->c, expn,
2162                                 sizeof(expn) - freq->stream.avail_out);
2163         } while (freq->stream.avail_in && freq->zret == Z_OK);
2164         return size;
2165 }
2166
2167 struct http_object_request *new_http_object_request(const char *base_url,
2168         unsigned char *sha1)
2169 {
2170         char *hex = sha1_to_hex(sha1);
2171         const char *filename;
2172         char prevfile[PATH_MAX];
2173         int prevlocal;
2174         char prev_buf[PREV_BUF_SIZE];
2175         ssize_t prev_read = 0;
2176         off_t prev_posn = 0;
2177         struct http_object_request *freq;
2178
2179         freq = xcalloc(1, sizeof(*freq));
2180         hashcpy(freq->sha1, sha1);
2181         freq->localfile = -1;
2182
2183         filename = sha1_file_name(sha1);
2184         snprintf(freq->tmpfile, sizeof(freq->tmpfile),
2185                  "%s.temp", filename);
2186
2187         snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
2188         unlink_or_warn(prevfile);
2189         rename(freq->tmpfile, prevfile);
2190         unlink_or_warn(freq->tmpfile);
2191
2192         if (freq->localfile != -1)
2193                 error("fd leakage in start: %d", freq->localfile);
2194         freq->localfile = open(freq->tmpfile,
2195                                O_WRONLY | O_CREAT | O_EXCL, 0666);
2196         /*
2197          * This could have failed due to the "lazy directory creation";
2198          * try to mkdir the last path component.
2199          */
2200         if (freq->localfile < 0 && errno == ENOENT) {
2201                 char *dir = strrchr(freq->tmpfile, '/');
2202                 if (dir) {
2203                         *dir = 0;
2204                         mkdir(freq->tmpfile, 0777);
2205                         *dir = '/';
2206                 }
2207                 freq->localfile = open(freq->tmpfile,
2208                                        O_WRONLY | O_CREAT | O_EXCL, 0666);
2209         }
2210
2211         if (freq->localfile < 0) {
2212                 error_errno("Couldn't create temporary file %s", freq->tmpfile);
2213                 goto abort;
2214         }
2215
2216         git_inflate_init(&freq->stream);
2217
2218         git_SHA1_Init(&freq->c);
2219
2220         freq->url = get_remote_object_url(base_url, hex, 0);
2221
2222         /*
2223          * If a previous temp file is present, process what was already
2224          * fetched.
2225          */
2226         prevlocal = open(prevfile, O_RDONLY);
2227         if (prevlocal != -1) {
2228                 do {
2229                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2230                         if (prev_read>0) {
2231                                 if (fwrite_sha1_file(prev_buf,
2232                                                      1,
2233                                                      prev_read,
2234                                                      freq) == prev_read) {
2235                                         prev_posn += prev_read;
2236                                 } else {
2237                                         prev_read = -1;
2238                                 }
2239                         }
2240                 } while (prev_read > 0);
2241                 close(prevlocal);
2242         }
2243         unlink_or_warn(prevfile);
2244
2245         /*
2246          * Reset inflate/SHA1 if there was an error reading the previous temp
2247          * file; also rewind to the beginning of the local file.
2248          */
2249         if (prev_read == -1) {
2250                 memset(&freq->stream, 0, sizeof(freq->stream));
2251                 git_inflate_init(&freq->stream);
2252                 git_SHA1_Init(&freq->c);
2253                 if (prev_posn>0) {
2254                         prev_posn = 0;
2255                         lseek(freq->localfile, 0, SEEK_SET);
2256                         if (ftruncate(freq->localfile, 0) < 0) {
2257                                 error_errno("Couldn't truncate temporary file %s",
2258                                             freq->tmpfile);
2259                                 goto abort;
2260                         }
2261                 }
2262         }
2263
2264         freq->slot = get_active_slot();
2265
2266         curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2267         curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2268         curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2269         curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2270         curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2271         curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2272
2273         /*
2274          * If we have successfully processed data from a previous fetch
2275          * attempt, only fetch the data we don't already have.
2276          */
2277         if (prev_posn>0) {
2278                 if (http_is_verbose)
2279                         fprintf(stderr,
2280                                 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2281                                 hex, (uintmax_t)prev_posn);
2282                 http_opt_request_remainder(freq->slot->curl, prev_posn);
2283         }
2284
2285         return freq;
2286
2287 abort:
2288         free(freq->url);
2289         free(freq);
2290         return NULL;
2291 }
2292
2293 void process_http_object_request(struct http_object_request *freq)
2294 {
2295         if (freq->slot == NULL)
2296                 return;
2297         freq->curl_result = freq->slot->curl_result;
2298         freq->http_code = freq->slot->http_code;
2299         freq->slot = NULL;
2300 }
2301
2302 int finish_http_object_request(struct http_object_request *freq)
2303 {
2304         struct stat st;
2305
2306         close(freq->localfile);
2307         freq->localfile = -1;
2308
2309         process_http_object_request(freq);
2310
2311         if (freq->http_code == 416) {
2312                 warning("requested range invalid; we may already have all the data.");
2313         } else if (freq->curl_result != CURLE_OK) {
2314                 if (stat(freq->tmpfile, &st) == 0)
2315                         if (st.st_size == 0)
2316                                 unlink_or_warn(freq->tmpfile);
2317                 return -1;
2318         }
2319
2320         git_inflate_end(&freq->stream);
2321         git_SHA1_Final(freq->real_sha1, &freq->c);
2322         if (freq->zret != Z_STREAM_END) {
2323                 unlink_or_warn(freq->tmpfile);
2324                 return -1;
2325         }
2326         if (hashcmp(freq->sha1, freq->real_sha1)) {
2327                 unlink_or_warn(freq->tmpfile);
2328                 return -1;
2329         }
2330         freq->rename =
2331                 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
2332
2333         return freq->rename;
2334 }
2335
2336 void abort_http_object_request(struct http_object_request *freq)
2337 {
2338         unlink_or_warn(freq->tmpfile);
2339
2340         release_http_object_request(freq);
2341 }
2342
2343 void release_http_object_request(struct http_object_request *freq)
2344 {
2345         if (freq->localfile != -1) {
2346                 close(freq->localfile);
2347                 freq->localfile = -1;
2348         }
2349         if (freq->url != NULL) {
2350                 FREE_AND_NULL(freq->url);
2351         }
2352         if (freq->slot != NULL) {
2353                 freq->slot->callback_func = NULL;
2354                 freq->slot->callback_data = NULL;
2355                 release_active_slot(freq->slot);
2356                 freq->slot = NULL;
2357         }
2358 }