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 LIBCURL_VERSION_NUM >= 0x073400
 870                 else if (starts_with(curl_http_proxy, "https"))
 871                         curl_easy_setopt(result,
 872                                 CURLOPT_PROXYTYPE, CURLPROXY_HTTPS);
 873 #endif
 874                 if (strstr(curl_http_proxy, "://"))
 875                         credential_from_url(&proxy_auth, curl_http_proxy);
 876                 else {
 877                         struct strbuf url = STRBUF_INIT;
 878                         strbuf_addf(&url, "http://%s", curl_http_proxy);
 879                         credential_from_url(&proxy_auth, url.buf);
 880                         strbuf_release(&url);
 881                 }
 882
 883                 if (!proxy_auth.host)
 884                         die("Invalid proxy URL '%s'", curl_http_proxy);
 885
 886                 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
 887 #if LIBCURL_VERSION_NUM >= 0x071304
 888                 var_override(&curl_no_proxy, getenv("NO_PROXY"));
 889                 var_override(&curl_no_proxy, getenv("no_proxy"));
 890                 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
 891 #endif
 892         }
 893         init_curl_proxy_auth(result);
 894
 895         set_curl_keepalive(result);
 896
 897         return result;
 898 }
 899
 900 static void set_from_env(const char **var, const char *envname)
 901 {
 902         const char *val = getenv(envname);
 903         if (val)
 904                 *var = val;
 905 }
 906
 907 static void protocol_http_header(void)
 908 {
 909         if (get_protocol_version_config() > 0) {
 910                 struct strbuf protocol_header = STRBUF_INIT;
 911
 912                 strbuf_addf(&protocol_header, GIT_PROTOCOL_HEADER ": version=%d",
 913                             get_protocol_version_config());
 914
 915
 916                 extra_http_headers = curl_slist_append(extra_http_headers,
 917                                                        protocol_header.buf);
 918                 strbuf_release(&protocol_header);
 919         }
 920 }
 921
 922 void http_init(struct remote *remote, const char *url, int proactive_auth)
 923 {
 924         char *low_speed_limit;
 925         char *low_speed_time;
 926         char *normalized_url;
 927         struct urlmatch_config config = { STRING_LIST_INIT_DUP };
 928
 929         config.section = "http";
 930         config.key = NULL;
 931         config.collect_fn = http_options;
 932         config.cascade_fn = git_default_config;
 933         config.cb = NULL;
 934
 935         http_is_verbose = 0;
 936         normalized_url = url_normalize(url, &config.url);
 937
 938         git_config(urlmatch_config_entry, &config);
 939         free(normalized_url);
 940
 941         if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
 942                 die("curl_global_init failed");
 943
 944         http_proactive_auth = proactive_auth;
 945
 946         if (remote && remote->http_proxy)
 947                 curl_http_proxy = xstrdup(remote->http_proxy);
 948
 949         if (remote)
 950                 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
 951
 952         protocol_http_header();
 953
 954         pragma_header = curl_slist_append(http_copy_default_headers(),
 955                 "Pragma: no-cache");
 956         no_pragma_header = curl_slist_append(http_copy_default_headers(),
 957                 "Pragma:");
 958
 959 #ifdef USE_CURL_MULTI
 960         {
 961                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 962                 if (http_max_requests != NULL)
 963                         max_requests = atoi(http_max_requests);
 964         }
 965
 966         curlm = curl_multi_init();
 967         if (!curlm)
 968                 die("curl_multi_init failed");
 969 #endif
 970
 971         if (getenv("GIT_SSL_NO_VERIFY"))
 972                 curl_ssl_verify = 0;
 973
 974         set_from_env(&ssl_cert, "GIT_SSL_CERT");
 975 #if LIBCURL_VERSION_NUM >= 0x070903
 976         set_from_env(&ssl_key, "GIT_SSL_KEY");
 977 #endif
 978 #if LIBCURL_VERSION_NUM >= 0x070908
 979         set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 980 #endif
 981         set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 982
 983         set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 984
 985         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 986         if (low_speed_limit != NULL)
 987                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 988         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 989         if (low_speed_time != NULL)
 990                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 991
 992         if (curl_ssl_verify == -1)
 993                 curl_ssl_verify = 1;
 994
 995         curl_session_count = 0;
 996 #ifdef USE_CURL_MULTI
 997         if (max_requests < 1)
 998                 max_requests = DEFAULT_MAX_REQUESTS;
 999 #endif
1000
1001         if (getenv("GIT_CURL_FTP_NO_EPSV"))
1002                 curl_ftp_no_epsv = 1;
1003
1004         if (url) {
1005                 credential_from_url(&http_auth, url);
1006                 if (!ssl_cert_password_required &&
1007                     getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
1008                     starts_with(url, "https://"))
1009                         ssl_cert_password_required = 1;
1010         }
1011
1012 #ifndef NO_CURL_EASY_DUPHANDLE
1013         curl_default = get_curl_handle();
1014 #endif
1015 }
1016
1017 void http_cleanup(void)
1018 {
1019         struct active_request_slot *slot = active_queue_head;
1020
1021         while (slot != NULL) {
1022                 struct active_request_slot *next = slot->next;
1023                 if (slot->curl != NULL) {
1024                         xmulti_remove_handle(slot);
1025                         curl_easy_cleanup(slot->curl);
1026                 }
1027                 free(slot);
1028                 slot = next;
1029         }
1030         active_queue_head = NULL;
1031
1032 #ifndef NO_CURL_EASY_DUPHANDLE
1033         curl_easy_cleanup(curl_default);
1034 #endif
1035
1036 #ifdef USE_CURL_MULTI
1037         curl_multi_cleanup(curlm);
1038 #endif
1039         curl_global_cleanup();
1040
1041         curl_slist_free_all(extra_http_headers);
1042         extra_http_headers = NULL;
1043
1044         curl_slist_free_all(pragma_header);
1045         pragma_header = NULL;
1046
1047         curl_slist_free_all(no_pragma_header);
1048         no_pragma_header = NULL;
1049
1050         if (curl_http_proxy) {
1051                 free((void *)curl_http_proxy);
1052                 curl_http_proxy = NULL;
1053         }
1054
1055         if (proxy_auth.password) {
1056                 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
1057                 FREE_AND_NULL(proxy_auth.password);
1058         }
1059
1060         free((void *)curl_proxyuserpwd);
1061         curl_proxyuserpwd = NULL;
1062
1063         free((void *)http_proxy_authmethod);
1064         http_proxy_authmethod = NULL;
1065
1066         if (cert_auth.password != NULL) {
1067                 memset(cert_auth.password, 0, strlen(cert_auth.password));
1068                 FREE_AND_NULL(cert_auth.password);
1069         }
1070         ssl_cert_password_required = 0;
1071
1072         FREE_AND_NULL(cached_accept_language);
1073 }
1074
1075 struct active_request_slot *get_active_slot(void)
1076 {
1077         struct active_request_slot *slot = active_queue_head;
1078         struct active_request_slot *newslot;
1079
1080 #ifdef USE_CURL_MULTI
1081         int num_transfers;
1082
1083         /* Wait for a slot to open up if the queue is full */
1084         while (active_requests >= max_requests) {
1085                 curl_multi_perform(curlm, &num_transfers);
1086                 if (num_transfers < active_requests)
1087                         process_curl_messages();
1088         }
1089 #endif
1090
1091         while (slot != NULL && slot->in_use)
1092                 slot = slot->next;
1093
1094         if (slot == NULL) {
1095                 newslot = xmalloc(sizeof(*newslot));
1096                 newslot->curl = NULL;
1097                 newslot->in_use = 0;
1098                 newslot->next = NULL;
1099
1100                 slot = active_queue_head;
1101                 if (slot == NULL) {
1102                         active_queue_head = newslot;
1103                 } else {
1104                         while (slot->next != NULL)
1105                                 slot = slot->next;
1106                         slot->next = newslot;
1107                 }
1108                 slot = newslot;
1109         }
1110
1111         if (slot->curl == NULL) {
1112 #ifdef NO_CURL_EASY_DUPHANDLE
1113                 slot->curl = get_curl_handle();
1114 #else
1115                 slot->curl = curl_easy_duphandle(curl_default);
1116 #endif
1117                 curl_session_count++;
1118         }
1119
1120         active_requests++;
1121         slot->in_use = 1;
1122         slot->results = NULL;
1123         slot->finished = NULL;
1124         slot->callback_data = NULL;
1125         slot->callback_func = NULL;
1126         curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1127         if (curl_save_cookies)
1128                 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1129         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1130         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1131         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1132         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1133         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1134         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1135         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1136         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1137         curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1138         curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1139
1140         /*
1141          * Default following to off unless "ALWAYS" is configured; this gives
1142          * callers a sane starting point, and they can tweak for individual
1143          * HTTP_FOLLOW_* cases themselves.
1144          */
1145         if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1146                 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1147         else
1148                 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1149
1150 #if LIBCURL_VERSION_NUM >= 0x070a08
1151         curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1152 #endif
1153 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1154         curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1155 #endif
1156         if (http_auth.password || curl_empty_auth_enabled())
1157                 init_curl_http_auth(slot->curl);
1158
1159         return slot;
1160 }
1161
1162 int start_active_slot(struct active_request_slot *slot)
1163 {
1164 #ifdef USE_CURL_MULTI
1165         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1166         int num_transfers;
1167
1168         if (curlm_result != CURLM_OK &&
1169             curlm_result != CURLM_CALL_MULTI_PERFORM) {
1170                 warning("curl_multi_add_handle failed: %s",
1171                         curl_multi_strerror(curlm_result));
1172                 active_requests--;
1173                 slot->in_use = 0;
1174                 return 0;
1175         }
1176
1177         /*
1178          * We know there must be something to do, since we just added
1179          * something.
1180          */
1181         curl_multi_perform(curlm, &num_transfers);
1182 #endif
1183         return 1;
1184 }
1185
1186 #ifdef USE_CURL_MULTI
1187 struct fill_chain {
1188         void *data;
1189         int (*fill)(void *);
1190         struct fill_chain *next;
1191 };
1192
1193 static struct fill_chain *fill_cfg;
1194
1195 void add_fill_function(void *data, int (*fill)(void *))
1196 {
1197         struct fill_chain *new = xmalloc(sizeof(*new));
1198         struct fill_chain **linkp = &fill_cfg;
1199         new->data = data;
1200         new->fill = fill;
1201         new->next = NULL;
1202         while (*linkp)
1203                 linkp = &(*linkp)->next;
1204         *linkp = new;
1205 }
1206
1207 void fill_active_slots(void)
1208 {
1209         struct active_request_slot *slot = active_queue_head;
1210
1211         while (active_requests < max_requests) {
1212                 struct fill_chain *fill;
1213                 for (fill = fill_cfg; fill; fill = fill->next)
1214                         if (fill->fill(fill->data))
1215                                 break;
1216
1217                 if (!fill)
1218                         break;
1219         }
1220
1221         while (slot != NULL) {
1222                 if (!slot->in_use && slot->curl != NULL
1223                         && curl_session_count > min_curl_sessions) {
1224                         curl_easy_cleanup(slot->curl);
1225                         slot->curl = NULL;
1226                         curl_session_count--;
1227                 }
1228                 slot = slot->next;
1229         }
1230 }
1231
1232 void step_active_slots(void)
1233 {
1234         int num_transfers;
1235         CURLMcode curlm_result;
1236
1237         do {
1238                 curlm_result = curl_multi_perform(curlm, &num_transfers);
1239         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1240         if (num_transfers < active_requests) {
1241                 process_curl_messages();
1242                 fill_active_slots();
1243         }
1244 }
1245 #endif
1246
1247 void run_active_slot(struct active_request_slot *slot)
1248 {
1249 #ifdef USE_CURL_MULTI
1250         fd_set readfds;
1251         fd_set writefds;
1252         fd_set excfds;
1253         int max_fd;
1254         struct timeval select_timeout;
1255         int finished = 0;
1256
1257         slot->finished = &finished;
1258         while (!finished) {
1259                 step_active_slots();
1260
1261                 if (slot->in_use) {
1262 #if LIBCURL_VERSION_NUM >= 0x070f04
1263                         long curl_timeout;
1264                         curl_multi_timeout(curlm, &curl_timeout);
1265                         if (curl_timeout == 0) {
1266                                 continue;
1267                         } else if (curl_timeout == -1) {
1268                                 select_timeout.tv_sec  = 0;
1269                                 select_timeout.tv_usec = 50000;
1270                         } else {
1271                                 select_timeout.tv_sec  =  curl_timeout / 1000;
1272                                 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1273                         }
1274 #else
1275                         select_timeout.tv_sec  = 0;
1276                         select_timeout.tv_usec = 50000;
1277 #endif
1278
1279                         max_fd = -1;
1280                         FD_ZERO(&readfds);
1281                         FD_ZERO(&writefds);
1282                         FD_ZERO(&excfds);
1283                         curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1284
1285                         /*
1286                          * It can happen that curl_multi_timeout returns a pathologically
1287                          * long timeout when curl_multi_fdset returns no file descriptors
1288                          * to read.  See commit message for more details.
1289                          */
1290                         if (max_fd < 0 &&
1291                             (select_timeout.tv_sec > 0 ||
1292                              select_timeout.tv_usec > 50000)) {
1293                                 select_timeout.tv_sec  = 0;
1294                                 select_timeout.tv_usec = 50000;
1295                         }
1296
1297                         select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1298                 }
1299         }
1300 #else
1301         while (slot->in_use) {
1302                 slot->curl_result = curl_easy_perform(slot->curl);
1303                 finish_active_slot(slot);
1304         }
1305 #endif
1306 }
1307
1308 static void release_active_slot(struct active_request_slot *slot)
1309 {
1310         closedown_active_slot(slot);
1311         if (slot->curl) {
1312                 xmulti_remove_handle(slot);
1313                 if (curl_session_count > min_curl_sessions) {
1314                         curl_easy_cleanup(slot->curl);
1315                         slot->curl = NULL;
1316                         curl_session_count--;
1317                 }
1318         }
1319 #ifdef USE_CURL_MULTI
1320         fill_active_slots();
1321 #endif
1322 }
1323
1324 void finish_all_active_slots(void)
1325 {
1326         struct active_request_slot *slot = active_queue_head;
1327
1328         while (slot != NULL)
1329                 if (slot->in_use) {
1330                         run_active_slot(slot);
1331                         slot = active_queue_head;
1332                 } else {
1333                         slot = slot->next;
1334                 }
1335 }
1336
1337 /* Helpers for modifying and creating URLs */
1338 static inline int needs_quote(int ch)
1339 {
1340         if (((ch >= 'A') && (ch <= 'Z'))
1341                         || ((ch >= 'a') && (ch <= 'z'))
1342                         || ((ch >= '0') && (ch <= '9'))
1343                         || (ch == '/')
1344                         || (ch == '-')
1345                         || (ch == '.'))
1346                 return 0;
1347         return 1;
1348 }
1349
1350 static char *quote_ref_url(const char *base, const char *ref)
1351 {
1352         struct strbuf buf = STRBUF_INIT;
1353         const char *cp;
1354         int ch;
1355
1356         end_url_with_slash(&buf, base);
1357
1358         for (cp = ref; (ch = *cp) != 0; cp++)
1359                 if (needs_quote(ch))
1360                         strbuf_addf(&buf, "%%%02x", ch);
1361                 else
1362                         strbuf_addch(&buf, *cp);
1363
1364         return strbuf_detach(&buf, NULL);
1365 }
1366
1367 void append_remote_object_url(struct strbuf *buf, const char *url,
1368                               const char *hex,
1369                               int only_two_digit_prefix)
1370 {
1371         end_url_with_slash(buf, url);
1372
1373         strbuf_addf(buf, "objects/%.*s/", 2, hex);
1374         if (!only_two_digit_prefix)
1375                 strbuf_addstr(buf, hex + 2);
1376 }
1377
1378 char *get_remote_object_url(const char *url, const char *hex,
1379                             int only_two_digit_prefix)
1380 {
1381         struct strbuf buf = STRBUF_INIT;
1382         append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1383         return strbuf_detach(&buf, NULL);
1384 }
1385
1386 static int handle_curl_result(struct slot_results *results)
1387 {
1388         /*
1389          * If we see a failing http code with CURLE_OK, we have turned off
1390          * FAILONERROR (to keep the server's custom error response), and should
1391          * translate the code into failure here.
1392          *
1393          * Likewise, if we see a redirect (30x code), that means we turned off
1394          * redirect-following, and we should treat the result as an error.
1395          */
1396         if (results->curl_result == CURLE_OK &&
1397             results->http_code >= 300) {
1398                 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1399                 /*
1400                  * Normally curl will already have put the "reason phrase"
1401                  * from the server into curl_errorstr; unfortunately without
1402                  * FAILONERROR it is lost, so we can give only the numeric
1403                  * status code.
1404                  */
1405                 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1406                           "The requested URL returned error: %ld",
1407                           results->http_code);
1408         }
1409
1410         if (results->curl_result == CURLE_OK) {
1411                 credential_approve(&http_auth);
1412                 if (proxy_auth.password)
1413                         credential_approve(&proxy_auth);
1414                 return HTTP_OK;
1415         } else if (missing_target(results))
1416                 return HTTP_MISSING_TARGET;
1417         else if (results->http_code == 401) {
1418                 if (http_auth.username && http_auth.password) {
1419                         credential_reject(&http_auth);
1420                         return HTTP_NOAUTH;
1421                 } else {
1422 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1423                         http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1424                         if (results->auth_avail) {
1425                                 http_auth_methods &= results->auth_avail;
1426                                 http_auth_methods_restricted = 1;
1427                         }
1428 #endif
1429                         return HTTP_REAUTH;
1430                 }
1431         } else {
1432                 if (results->http_connectcode == 407)
1433                         credential_reject(&proxy_auth);
1434 #if LIBCURL_VERSION_NUM >= 0x070c00
1435                 if (!curl_errorstr[0])
1436                         strlcpy(curl_errorstr,
1437                                 curl_easy_strerror(results->curl_result),
1438                                 sizeof(curl_errorstr));
1439 #endif
1440                 return HTTP_ERROR;
1441         }
1442 }
1443
1444 int run_one_slot(struct active_request_slot *slot,
1445                  struct slot_results *results)
1446 {
1447         slot->results = results;
1448         if (!start_active_slot(slot)) {
1449                 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1450                           "failed to start HTTP request");
1451                 return HTTP_START_FAILED;
1452         }
1453
1454         run_active_slot(slot);
1455         return handle_curl_result(results);
1456 }
1457
1458 struct curl_slist *http_copy_default_headers(void)
1459 {
1460         struct curl_slist *headers = NULL, *h;
1461
1462         for (h = extra_http_headers; h; h = h->next)
1463                 headers = curl_slist_append(headers, h->data);
1464
1465         return headers;
1466 }
1467
1468 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1469 {
1470         char *ptr;
1471         CURLcode ret;
1472
1473         strbuf_reset(buf);
1474         ret = curl_easy_getinfo(curl, info, &ptr);
1475         if (!ret && ptr)
1476                 strbuf_addstr(buf, ptr);
1477         return ret;
1478 }
1479
1480 /*
1481  * Check for and extract a content-type parameter. "raw"
1482  * should be positioned at the start of the potential
1483  * parameter, with any whitespace already removed.
1484  *
1485  * "name" is the name of the parameter. The value is appended
1486  * to "out".
1487  */
1488 static int extract_param(const char *raw, const char *name,
1489                          struct strbuf *out)
1490 {
1491         size_t len = strlen(name);
1492
1493         if (strncasecmp(raw, name, len))
1494                 return -1;
1495         raw += len;
1496
1497         if (*raw != '=')
1498                 return -1;
1499         raw++;
1500
1501         while (*raw && !isspace(*raw) && *raw != ';')
1502                 strbuf_addch(out, *raw++);
1503         return 0;
1504 }
1505
1506 /*
1507  * Extract a normalized version of the content type, with any
1508  * spaces suppressed, all letters lowercased, and no trailing ";"
1509  * or parameters.
1510  *
1511  * Note that we will silently remove even invalid whitespace. For
1512  * example, "text / plain" is specifically forbidden by RFC 2616,
1513  * but "text/plain" is the only reasonable output, and this keeps
1514  * our code simple.
1515  *
1516  * If the "charset" argument is not NULL, store the value of any
1517  * charset parameter there.
1518  *
1519  * Example:
1520  *   "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1521  *   "text / plain" -> "text/plain"
1522  */
1523 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1524                                  struct strbuf *charset)
1525 {
1526         const char *p;
1527
1528         strbuf_reset(type);
1529         strbuf_grow(type, raw->len);
1530         for (p = raw->buf; *p; p++) {
1531                 if (isspace(*p))
1532                         continue;
1533                 if (*p == ';') {
1534                         p++;
1535                         break;
1536                 }
1537                 strbuf_addch(type, tolower(*p));
1538         }
1539
1540         if (!charset)
1541                 return;
1542
1543         strbuf_reset(charset);
1544         while (*p) {
1545                 while (isspace(*p) || *p == ';')
1546                         p++;
1547                 if (!extract_param(p, "charset", charset))
1548                         return;
1549                 while (*p && !isspace(*p))
1550                         p++;
1551         }
1552
1553         if (!charset->len && starts_with(type->buf, "text/"))
1554                 strbuf_addstr(charset, "ISO-8859-1");
1555 }
1556
1557 static void write_accept_language(struct strbuf *buf)
1558 {
1559         /*
1560          * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1561          * that, q-value will be smaller than 0.001, the minimum q-value the
1562          * HTTP specification allows. See
1563          * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1564          */
1565         const int MAX_DECIMAL_PLACES = 3;
1566         const int MAX_LANGUAGE_TAGS = 1000;
1567         const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1568         char **language_tags = NULL;
1569         int num_langs = 0;
1570         const char *s = get_preferred_languages();
1571         int i;
1572         struct strbuf tag = STRBUF_INIT;
1573
1574         /* Don't add Accept-Language header if no language is preferred. */
1575         if (!s)
1576                 return;
1577
1578         /*
1579          * Split the colon-separated string of preferred languages into
1580          * language_tags array.
1581          */
1582         do {
1583                 /* collect language tag */
1584                 for (; *s && (isalnum(*s) || *s == '_'); s++)
1585                         strbuf_addch(&tag, *s == '_' ? '-' : *s);
1586
1587                 /* skip .codeset, @modifier and any other unnecessary parts */
1588                 while (*s && *s != ':')
1589                         s++;
1590
1591                 if (tag.len) {
1592                         num_langs++;
1593                         REALLOC_ARRAY(language_tags, num_langs);
1594                         language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1595                         if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1596                                 break;
1597                 }
1598         } while (*s++);
1599
1600         /* write Accept-Language header into buf */
1601         if (num_langs) {
1602                 int last_buf_len = 0;
1603                 int max_q;
1604                 int decimal_places;
1605                 char q_format[32];
1606
1607                 /* add '*' */
1608                 REALLOC_ARRAY(language_tags, num_langs + 1);
1609                 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1610
1611                 /* compute decimal_places */
1612                 for (max_q = 1, decimal_places = 0;
1613                      max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1614                      decimal_places++, max_q *= 10)
1615                         ;
1616
1617                 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1618
1619                 strbuf_addstr(buf, "Accept-Language: ");
1620
1621                 for (i = 0; i < num_langs; i++) {
1622                         if (i > 0)
1623                                 strbuf_addstr(buf, ", ");
1624
1625                         strbuf_addstr(buf, language_tags[i]);
1626
1627                         if (i > 0)
1628                                 strbuf_addf(buf, q_format, max_q - i);
1629
1630                         if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1631                                 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1632                                 break;
1633                         }
1634
1635                         last_buf_len = buf->len;
1636                 }
1637         }
1638
1639         /* free language tags -- last one is a static '*' */
1640         for (i = 0; i < num_langs - 1; i++)
1641                 free(language_tags[i]);
1642         free(language_tags);
1643 }
1644
1645 /*
1646  * Get an Accept-Language header which indicates user's preferred languages.
1647  *
1648  * Examples:
1649  *   LANGUAGE= -> ""
1650  *   LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1651  *   LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1652  *   LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1653  *   LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1654  *   LANGUAGE= LANG=C -> ""
1655  */
1656 static const char *get_accept_language(void)
1657 {
1658         if (!cached_accept_language) {
1659                 struct strbuf buf = STRBUF_INIT;
1660                 write_accept_language(&buf);
1661                 if (buf.len > 0)
1662                         cached_accept_language = strbuf_detach(&buf, NULL);
1663         }
1664
1665         return cached_accept_language;
1666 }
1667
1668 static void http_opt_request_remainder(CURL *curl, off_t pos)
1669 {
1670         char buf[128];
1671         xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1672         curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1673 }
1674
1675 /* http_request() targets */
1676 #define HTTP_REQUEST_STRBUF     0
1677 #define HTTP_REQUEST_FILE       1
1678
1679 static int http_request(const char *url,
1680                         void *result, int target,
1681                         const struct http_get_options *options)
1682 {
1683         struct active_request_slot *slot;
1684         struct slot_results results;
1685         struct curl_slist *headers = http_copy_default_headers();
1686         struct strbuf buf = STRBUF_INIT;
1687         const char *accept_language;
1688         int ret;
1689
1690         slot = get_active_slot();
1691         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1692
1693         if (result == NULL) {
1694                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1695         } else {
1696                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1697                 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1698
1699                 if (target == HTTP_REQUEST_FILE) {
1700                         off_t posn = ftello(result);
1701                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1702                                          fwrite);
1703                         if (posn > 0)
1704                                 http_opt_request_remainder(slot->curl, posn);
1705                 } else
1706                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1707                                          fwrite_buffer);
1708         }
1709
1710         accept_language = get_accept_language();
1711
1712         if (accept_language)
1713                 headers = curl_slist_append(headers, accept_language);
1714
1715         strbuf_addstr(&buf, "Pragma:");
1716         if (options && options->no_cache)
1717                 strbuf_addstr(&buf, " no-cache");
1718         if (options && options->keep_error)
1719                 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1720         if (options && options->initial_request &&
1721             http_follow_config == HTTP_FOLLOW_INITIAL)
1722                 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1723
1724         headers = curl_slist_append(headers, buf.buf);
1725
1726         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1727         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1728         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1729
1730         ret = run_one_slot(slot, &results);
1731
1732         if (options && options->content_type) {
1733                 struct strbuf raw = STRBUF_INIT;
1734                 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1735                 extract_content_type(&raw, options->content_type,
1736                                      options->charset);
1737                 strbuf_release(&raw);
1738         }
1739
1740         if (options && options->effective_url)
1741                 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1742                                 options->effective_url);
1743
1744         curl_slist_free_all(headers);
1745         strbuf_release(&buf);
1746
1747         return ret;
1748 }
1749
1750 /*
1751  * Update the "base" url to a more appropriate value, as deduced by
1752  * redirects seen when requesting a URL starting with "url".
1753  *
1754  * The "asked" parameter is a URL that we asked curl to access, and must begin
1755  * with "base".
1756  *
1757  * The "got" parameter is the URL that curl reported to us as where we ended
1758  * up.
1759  *
1760  * Returns 1 if we updated the base url, 0 otherwise.
1761  *
1762  * Our basic strategy is to compare "base" and "asked" to find the bits
1763  * specific to our request. We then strip those bits off of "got" to yield the
1764  * new base. So for example, if our base is "http://example.com/foo.git",
1765  * and we ask for "http://example.com/foo.git/info/refs", we might end up
1766  * with "https://other.example.com/foo.git/info/refs". We would want the
1767  * new URL to become "https://other.example.com/foo.git".
1768  *
1769  * Note that this assumes a sane redirect scheme. It's entirely possible
1770  * in the example above to end up at a URL that does not even end in
1771  * "info/refs".  In such a case we die. There's not much we can do, such a
1772  * scheme is unlikely to represent a real git repository, and failing to
1773  * rewrite the base opens options for malicious redirects to do funny things.
1774  */
1775 static int update_url_from_redirect(struct strbuf *base,
1776                                     const char *asked,
1777                                     const struct strbuf *got)
1778 {
1779         const char *tail;
1780         size_t new_len;
1781
1782         if (!strcmp(asked, got->buf))
1783                 return 0;
1784
1785         if (!skip_prefix(asked, base->buf, &tail))
1786                 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1787                     asked, base->buf);
1788
1789         new_len = got->len;
1790         if (!strip_suffix_mem(got->buf, &new_len, tail))
1791                 die(_("unable to update url base from redirection:\n"
1792                       "  asked for: %s\n"
1793                       "   redirect: %s"),
1794                     asked, got->buf);
1795
1796         strbuf_reset(base);
1797         strbuf_add(base, got->buf, new_len);
1798
1799         return 1;
1800 }
1801
1802 static int http_request_reauth(const char *url,
1803                                void *result, int target,
1804                                struct http_get_options *options)
1805 {
1806         int ret = http_request(url, result, target, options);
1807
1808         if (ret != HTTP_OK && ret != HTTP_REAUTH)
1809                 return ret;
1810
1811         if (options && options->effective_url && options->base_url) {
1812                 if (update_url_from_redirect(options->base_url,
1813                                              url, options->effective_url)) {
1814                         credential_from_url(&http_auth, options->base_url->buf);
1815                         url = options->effective_url->buf;
1816                 }
1817         }
1818
1819         if (ret != HTTP_REAUTH)
1820                 return ret;
1821
1822         /*
1823          * If we are using KEEP_ERROR, the previous request may have
1824          * put cruft into our output stream; we should clear it out before
1825          * making our next request. We only know how to do this for
1826          * the strbuf case, but that is enough to satisfy current callers.
1827          */
1828         if (options && options->keep_error) {
1829                 switch (target) {
1830                 case HTTP_REQUEST_STRBUF:
1831                         strbuf_reset(result);
1832                         break;
1833                 default:
1834                         die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1835                 }
1836         }
1837
1838         credential_fill(&http_auth);
1839
1840         return http_request(url, result, target, options);
1841 }
1842
1843 int http_get_strbuf(const char *url,
1844                     struct strbuf *result,
1845                     struct http_get_options *options)
1846 {
1847         return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1848 }
1849
1850 /*
1851  * Downloads a URL and stores the result in the given file.
1852  *
1853  * If a previous interrupted download is detected (i.e. a previous temporary
1854  * file is still around) the download is resumed.
1855  */
1856 static int http_get_file(const char *url, const char *filename,
1857                          struct http_get_options *options)
1858 {
1859         int ret;
1860         struct strbuf tmpfile = STRBUF_INIT;
1861         FILE *result;
1862
1863         strbuf_addf(&tmpfile, "%s.temp", filename);
1864         result = fopen(tmpfile.buf, "a");
1865         if (!result) {
1866                 error("Unable to open local file %s", tmpfile.buf);
1867                 ret = HTTP_ERROR;
1868                 goto cleanup;
1869         }
1870
1871         ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1872         fclose(result);
1873
1874         if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1875                 ret = HTTP_ERROR;
1876 cleanup:
1877         strbuf_release(&tmpfile);
1878         return ret;
1879 }
1880
1881 int http_fetch_ref(const char *base, struct ref *ref)
1882 {
1883         struct http_get_options options = {0};
1884         char *url;
1885         struct strbuf buffer = STRBUF_INIT;
1886         int ret = -1;
1887
1888         options.no_cache = 1;
1889
1890         url = quote_ref_url(base, ref->name);
1891         if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1892                 strbuf_rtrim(&buffer);
1893                 if (buffer.len == 40)
1894                         ret = get_oid_hex(buffer.buf, &ref->old_oid);
1895                 else if (starts_with(buffer.buf, "ref: ")) {
1896                         ref->symref = xstrdup(buffer.buf + 5);
1897                         ret = 0;
1898                 }
1899         }
1900
1901         strbuf_release(&buffer);
1902         free(url);
1903         return ret;
1904 }
1905
1906 /* Helpers for fetching packs */
1907 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1908 {
1909         char *url, *tmp;
1910         struct strbuf buf = STRBUF_INIT;
1911
1912         if (http_is_verbose)
1913                 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1914
1915         end_url_with_slash(&buf, base_url);
1916         strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1917         url = strbuf_detach(&buf, NULL);
1918
1919         strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1920         tmp = strbuf_detach(&buf, NULL);
1921
1922         if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1923                 error("Unable to get pack index %s", url);
1924                 FREE_AND_NULL(tmp);
1925         }
1926
1927         free(url);
1928         return tmp;
1929 }
1930
1931 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1932         unsigned char *sha1, const char *base_url)
1933 {
1934         struct packed_git *new_pack;
1935         char *tmp_idx = NULL;
1936         int ret;
1937
1938         if (has_pack_index(sha1)) {
1939                 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1940                 if (!new_pack)
1941                         return -1; /* parse_pack_index() already issued error message */
1942                 goto add_pack;
1943         }
1944
1945         tmp_idx = fetch_pack_index(sha1, base_url);
1946         if (!tmp_idx)
1947                 return -1;
1948
1949         new_pack = parse_pack_index(sha1, tmp_idx);
1950         if (!new_pack) {
1951                 unlink(tmp_idx);
1952                 free(tmp_idx);
1953
1954                 return -1; /* parse_pack_index() already issued error message */
1955         }
1956
1957         ret = verify_pack_index(new_pack);
1958         if (!ret) {
1959                 close_pack_index(new_pack);
1960                 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1961         }
1962         free(tmp_idx);
1963         if (ret)
1964                 return -1;
1965
1966 add_pack:
1967         new_pack->next = *packs_head;
1968         *packs_head = new_pack;
1969         return 0;
1970 }
1971
1972 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1973 {
1974         struct http_get_options options = {0};
1975         int ret = 0, i = 0;
1976         char *url, *data;
1977         struct strbuf buf = STRBUF_INIT;
1978         unsigned char sha1[20];
1979
1980         end_url_with_slash(&buf, base_url);
1981         strbuf_addstr(&buf, "objects/info/packs");
1982         url = strbuf_detach(&buf, NULL);
1983
1984         options.no_cache = 1;
1985         ret = http_get_strbuf(url, &buf, &options);
1986         if (ret != HTTP_OK)
1987                 goto cleanup;
1988
1989         data = buf.buf;
1990         while (i < buf.len) {
1991                 switch (data[i]) {
1992                 case 'P':
1993                         i++;
1994                         if (i + 52 <= buf.len &&
1995                             starts_with(data + i, " pack-") &&
1996                             starts_with(data + i + 46, ".pack\n")) {
1997                                 get_sha1_hex(data + i + 6, sha1);
1998                                 fetch_and_setup_pack_index(packs_head, sha1,
1999                                                       base_url);
2000                                 i += 51;
2001                                 break;
2002                         }
2003                 default:
2004                         while (i < buf.len && data[i] != '\n')
2005                                 i++;
2006                 }
2007                 i++;
2008         }
2009
2010 cleanup:
2011         free(url);
2012         return ret;
2013 }
2014
2015 void release_http_pack_request(struct http_pack_request *preq)
2016 {
2017         if (preq->packfile != NULL) {
2018                 fclose(preq->packfile);
2019                 preq->packfile = NULL;
2020         }
2021         preq->slot = NULL;
2022         free(preq->url);
2023         free(preq);
2024 }
2025
2026 int finish_http_pack_request(struct http_pack_request *preq)
2027 {
2028         struct packed_git **lst;
2029         struct packed_git *p = preq->target;
2030         char *tmp_idx;
2031         size_t len;
2032         struct child_process ip = CHILD_PROCESS_INIT;
2033         const char *ip_argv[8];
2034
2035         close_pack_index(p);
2036
2037         fclose(preq->packfile);
2038         preq->packfile = NULL;
2039
2040         lst = preq->lst;
2041         while (*lst != p)
2042                 lst = &((*lst)->next);
2043         *lst = (*lst)->next;
2044
2045         if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
2046                 die("BUG: pack tmpfile does not end in .pack.temp?");
2047         tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
2048
2049         ip_argv[0] = "index-pack";
2050         ip_argv[1] = "-o";
2051         ip_argv[2] = tmp_idx;
2052         ip_argv[3] = preq->tmpfile;
2053         ip_argv[4] = NULL;
2054
2055         ip.argv = ip_argv;
2056         ip.git_cmd = 1;
2057         ip.no_stdin = 1;
2058         ip.no_stdout = 1;
2059
2060         if (run_command(&ip)) {
2061                 unlink(preq->tmpfile);
2062                 unlink(tmp_idx);
2063                 free(tmp_idx);
2064                 return -1;
2065         }
2066
2067         unlink(sha1_pack_index_name(p->sha1));
2068
2069         if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
2070          || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
2071                 free(tmp_idx);
2072                 return -1;
2073         }
2074
2075         install_packed_git(p);
2076         free(tmp_idx);
2077         return 0;
2078 }
2079
2080 struct http_pack_request *new_http_pack_request(
2081         struct packed_git *target, const char *base_url)
2082 {
2083         off_t prev_posn = 0;
2084         struct strbuf buf = STRBUF_INIT;
2085         struct http_pack_request *preq;
2086
2087         preq = xcalloc(1, sizeof(*preq));
2088         preq->target = target;
2089
2090         end_url_with_slash(&buf, base_url);
2091         strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2092                 sha1_to_hex(target->sha1));
2093         preq->url = strbuf_detach(&buf, NULL);
2094
2095         snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
2096                 sha1_pack_name(target->sha1));
2097         preq->packfile = fopen(preq->tmpfile, "a");
2098         if (!preq->packfile) {
2099                 error("Unable to open local file %s for pack",
2100                       preq->tmpfile);
2101                 goto abort;
2102         }
2103
2104         preq->slot = get_active_slot();
2105         curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
2106         curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2107         curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2108         curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
2109                 no_pragma_header);
2110
2111         /*
2112          * If there is data present from a previous transfer attempt,
2113          * resume where it left off
2114          */
2115         prev_posn = ftello(preq->packfile);
2116         if (prev_posn>0) {
2117                 if (http_is_verbose)
2118                         fprintf(stderr,
2119                                 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2120                                 sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
2121                 http_opt_request_remainder(preq->slot->curl, prev_posn);
2122         }
2123
2124         return preq;
2125
2126 abort:
2127         free(preq->url);
2128         free(preq);
2129         return NULL;
2130 }
2131
2132 /* Helpers for fetching objects (loose) */
2133 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2134                                void *data)
2135 {
2136         unsigned char expn[4096];
2137         size_t size = eltsize * nmemb;
2138         int posn = 0;
2139         struct http_object_request *freq = data;
2140         struct active_request_slot *slot = freq->slot;
2141
2142         if (slot) {
2143                 CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2144                                                 &slot->http_code);
2145                 if (c != CURLE_OK)
2146                         die("BUG: curl_easy_getinfo for HTTP code failed: %s",
2147                                 curl_easy_strerror(c));
2148                 if (slot->http_code >= 300)
2149                         return size;
2150         }
2151
2152         do {
2153                 ssize_t retval = xwrite(freq->localfile,
2154                                         (char *) ptr + posn, size - posn);
2155                 if (retval < 0)
2156                         return posn;
2157                 posn += retval;
2158         } while (posn < size);
2159
2160         freq->stream.avail_in = size;
2161         freq->stream.next_in = (void *)ptr;
2162         do {
2163                 freq->stream.next_out = expn;
2164                 freq->stream.avail_out = sizeof(expn);
2165                 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2166                 git_SHA1_Update(&freq->c, expn,
2167                                 sizeof(expn) - freq->stream.avail_out);
2168         } while (freq->stream.avail_in && freq->zret == Z_OK);
2169         return size;
2170 }
2171
2172 struct http_object_request *new_http_object_request(const char *base_url,
2173         unsigned char *sha1)
2174 {
2175         char *hex = sha1_to_hex(sha1);
2176         const char *filename;
2177         char prevfile[PATH_MAX];
2178         int prevlocal;
2179         char prev_buf[PREV_BUF_SIZE];
2180         ssize_t prev_read = 0;
2181         off_t prev_posn = 0;
2182         struct http_object_request *freq;
2183
2184         freq = xcalloc(1, sizeof(*freq));
2185         hashcpy(freq->sha1, sha1);
2186         freq->localfile = -1;
2187
2188         filename = sha1_file_name(sha1);
2189         snprintf(freq->tmpfile, sizeof(freq->tmpfile),
2190                  "%s.temp", filename);
2191
2192         snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
2193         unlink_or_warn(prevfile);
2194         rename(freq->tmpfile, prevfile);
2195         unlink_or_warn(freq->tmpfile);
2196
2197         if (freq->localfile != -1)
2198                 error("fd leakage in start: %d", freq->localfile);
2199         freq->localfile = open(freq->tmpfile,
2200                                O_WRONLY | O_CREAT | O_EXCL, 0666);
2201         /*
2202          * This could have failed due to the "lazy directory creation";
2203          * try to mkdir the last path component.
2204          */
2205         if (freq->localfile < 0 && errno == ENOENT) {
2206                 char *dir = strrchr(freq->tmpfile, '/');
2207                 if (dir) {
2208                         *dir = 0;
2209                         mkdir(freq->tmpfile, 0777);
2210                         *dir = '/';
2211                 }
2212                 freq->localfile = open(freq->tmpfile,
2213                                        O_WRONLY | O_CREAT | O_EXCL, 0666);
2214         }
2215
2216         if (freq->localfile < 0) {
2217                 error_errno("Couldn't create temporary file %s", freq->tmpfile);
2218                 goto abort;
2219         }
2220
2221         git_inflate_init(&freq->stream);
2222
2223         git_SHA1_Init(&freq->c);
2224
2225         freq->url = get_remote_object_url(base_url, hex, 0);
2226
2227         /*
2228          * If a previous temp file is present, process what was already
2229          * fetched.
2230          */
2231         prevlocal = open(prevfile, O_RDONLY);
2232         if (prevlocal != -1) {
2233                 do {
2234                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2235                         if (prev_read>0) {
2236                                 if (fwrite_sha1_file(prev_buf,
2237                                                      1,
2238                                                      prev_read,
2239                                                      freq) == prev_read) {
2240                                         prev_posn += prev_read;
2241                                 } else {
2242                                         prev_read = -1;
2243                                 }
2244                         }
2245                 } while (prev_read > 0);
2246                 close(prevlocal);
2247         }
2248         unlink_or_warn(prevfile);
2249
2250         /*
2251          * Reset inflate/SHA1 if there was an error reading the previous temp
2252          * file; also rewind to the beginning of the local file.
2253          */
2254         if (prev_read == -1) {
2255                 memset(&freq->stream, 0, sizeof(freq->stream));
2256                 git_inflate_init(&freq->stream);
2257                 git_SHA1_Init(&freq->c);
2258                 if (prev_posn>0) {
2259                         prev_posn = 0;
2260                         lseek(freq->localfile, 0, SEEK_SET);
2261                         if (ftruncate(freq->localfile, 0) < 0) {
2262                                 error_errno("Couldn't truncate temporary file %s",
2263                                             freq->tmpfile);
2264                                 goto abort;
2265                         }
2266                 }
2267         }
2268
2269         freq->slot = get_active_slot();
2270
2271         curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2272         curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2273         curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2274         curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2275         curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2276         curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2277
2278         /*
2279          * If we have successfully processed data from a previous fetch
2280          * attempt, only fetch the data we don't already have.
2281          */
2282         if (prev_posn>0) {
2283                 if (http_is_verbose)
2284                         fprintf(stderr,
2285                                 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2286                                 hex, (uintmax_t)prev_posn);
2287                 http_opt_request_remainder(freq->slot->curl, prev_posn);
2288         }
2289
2290         return freq;
2291
2292 abort:
2293         free(freq->url);
2294         free(freq);
2295         return NULL;
2296 }
2297
2298 void process_http_object_request(struct http_object_request *freq)
2299 {
2300         if (freq->slot == NULL)
2301                 return;
2302         freq->curl_result = freq->slot->curl_result;
2303         freq->http_code = freq->slot->http_code;
2304         freq->slot = NULL;
2305 }
2306
2307 int finish_http_object_request(struct http_object_request *freq)
2308 {
2309         struct stat st;
2310
2311         close(freq->localfile);
2312         freq->localfile = -1;
2313
2314         process_http_object_request(freq);
2315
2316         if (freq->http_code == 416) {
2317                 warning("requested range invalid; we may already have all the data.");
2318         } else if (freq->curl_result != CURLE_OK) {
2319                 if (stat(freq->tmpfile, &st) == 0)
2320                         if (st.st_size == 0)
2321                                 unlink_or_warn(freq->tmpfile);
2322                 return -1;
2323         }
2324
2325         git_inflate_end(&freq->stream);
2326         git_SHA1_Final(freq->real_sha1, &freq->c);
2327         if (freq->zret != Z_STREAM_END) {
2328                 unlink_or_warn(freq->tmpfile);
2329                 return -1;
2330         }
2331         if (hashcmp(freq->sha1, freq->real_sha1)) {
2332                 unlink_or_warn(freq->tmpfile);
2333                 return -1;
2334         }
2335         freq->rename =
2336                 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
2337
2338         return freq->rename;
2339 }
2340
2341 void abort_http_object_request(struct http_object_request *freq)
2342 {
2343         unlink_or_warn(freq->tmpfile);
2344
2345         release_http_object_request(freq);
2346 }
2347
2348 void release_http_object_request(struct http_object_request *freq)
2349 {
2350         if (freq->localfile != -1) {
2351                 close(freq->localfile);
2352                 freq->localfile = -1;
2353         }
2354         if (freq->url != NULL) {
2355                 FREE_AND_NULL(freq->url);
2356         }
2357         if (freq->slot != NULL) {
2358                 freq->slot->callback_func = NULL;
2359                 freq->slot->callback_data = NULL;
2360                 release_active_slot(freq->slot);
2361                 freq->slot = NULL;
2362         }
2363 }