Andrew's git - gitweb.git/blob

4c4614c92fcff0cb1ec90e22d6335797f3cba8c5
   1#include "http.h"
   2
   3int data_received;
   4int active_requests;
   5
   6#ifdef USE_CURL_MULTI
   7static int max_requests = -1;
   8static CURLM *curlm;
   9#endif
  10#ifndef NO_CURL_EASY_DUPHANDLE
  11static CURL *curl_default;
  12#endif
  13char curl_errorstr[CURL_ERROR_SIZE];
  14
  15static int curl_ssl_verify = -1;
  16static const char *ssl_cert;
  17#if LIBCURL_VERSION_NUM >= 0x070902
  18static const char *ssl_key;
  19#endif
  20#if LIBCURL_VERSION_NUM >= 0x070908
  21static const char *ssl_capath;
  22#endif
  23static const char *ssl_cainfo;
  24static long curl_low_speed_limit = -1;
  25static long curl_low_speed_time = -1;
  26static int curl_ftp_no_epsv;
  27static const char *curl_http_proxy;
  28
  29static struct curl_slist *pragma_header;
  30
  31static struct active_request_slot *active_queue_head;
  32
  33size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  34{
  35        size_t size = eltsize * nmemb;
  36        struct buffer *buffer = buffer_;
  37
  38        if (size > buffer->buf.len - buffer->posn)
  39                size = buffer->buf.len - buffer->posn;
  40        memcpy(ptr, buffer->buf.buf + buffer->posn, size);
  41        buffer->posn += size;
  42
  43        return size;
  44}
  45
  46size_t fwrite_buffer(const void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  47{
  48        size_t size = eltsize * nmemb;
  49        struct strbuf *buffer = buffer_;
  50
  51        strbuf_add(buffer, ptr, size);
  52        data_received++;
  53        return size;
  54}
  55
  56size_t fwrite_null(const void *ptr, size_t eltsize, size_t nmemb, void *strbuf)
  57{
  58        data_received++;
  59        return eltsize * nmemb;
  60}
  61
  62static void finish_active_slot(struct active_request_slot *slot);
  63
  64#ifdef USE_CURL_MULTI
  65static void process_curl_messages(void)
  66{
  67        int num_messages;
  68        struct active_request_slot *slot;
  69        CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
  70
  71        while (curl_message != NULL) {
  72                if (curl_message->msg == CURLMSG_DONE) {
  73                        int curl_result = curl_message->data.result;
  74                        slot = active_queue_head;
  75                        while (slot != NULL &&
  76                               slot->curl != curl_message->easy_handle)
  77                                slot = slot->next;
  78                        if (slot != NULL) {
  79                                curl_multi_remove_handle(curlm, slot->curl);
  80                                slot->curl_result = curl_result;
  81                                finish_active_slot(slot);
  82                        } else {
  83                                fprintf(stderr, "Received DONE message for unknown request!\n");
  84                        }
  85                } else {
  86                        fprintf(stderr, "Unknown CURL message received: %d\n",
  87                                (int)curl_message->msg);
  88                }
  89                curl_message = curl_multi_info_read(curlm, &num_messages);
  90        }
  91}
  92#endif
  93
  94static int http_options(const char *var, const char *value, void *cb)
  95{
  96        if (!strcmp("http.sslverify", var)) {
  97                curl_ssl_verify = git_config_bool(var, value);
  98                return 0;
  99        }
 100        if (!strcmp("http.sslcert", var))
 101                return git_config_string(&ssl_cert, var, value);
 102#if LIBCURL_VERSION_NUM >= 0x070902
 103        if (!strcmp("http.sslkey", var))
 104                return git_config_string(&ssl_key, var, value);
 105#endif
 106#if LIBCURL_VERSION_NUM >= 0x070908
 107        if (!strcmp("http.sslcapath", var))
 108                return git_config_string(&ssl_capath, var, value);
 109#endif
 110        if (!strcmp("http.sslcainfo", var))
 111                return git_config_string(&ssl_cainfo, var, value);
 112#ifdef USE_CURL_MULTI
 113        if (!strcmp("http.maxrequests", var)) {
 114                max_requests = git_config_int(var, value);
 115                return 0;
 116        }
 117#endif
 118        if (!strcmp("http.lowspeedlimit", var)) {
 119                curl_low_speed_limit = (long)git_config_int(var, value);
 120                return 0;
 121        }
 122        if (!strcmp("http.lowspeedtime", var)) {
 123                curl_low_speed_time = (long)git_config_int(var, value);
 124                return 0;
 125        }
 126
 127        if (!strcmp("http.noepsv", var)) {
 128                curl_ftp_no_epsv = git_config_bool(var, value);
 129                return 0;
 130        }
 131        if (!strcmp("http.proxy", var))
 132                return git_config_string(&curl_http_proxy, var, value);
 133
 134        /* Fall back on the default ones */
 135        return git_default_config(var, value, cb);
 136}
 137
 138static CURL *get_curl_handle(void)
 139{
 140        CURL *result = curl_easy_init();
 141
 142        if (!curl_ssl_verify) {
 143                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 144                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 145        } else {
 146                /* Verify authenticity of the peer's certificate */
 147                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 148                /* The name in the cert must match whom we tried to connect */
 149                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 150        }
 151
 152#if LIBCURL_VERSION_NUM >= 0x070907
 153        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 154#endif
 155
 156        if (ssl_cert != NULL)
 157                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 158#if LIBCURL_VERSION_NUM >= 0x070902
 159        if (ssl_key != NULL)
 160                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 161#endif
 162#if LIBCURL_VERSION_NUM >= 0x070908
 163        if (ssl_capath != NULL)
 164                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 165#endif
 166        if (ssl_cainfo != NULL)
 167                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 168        curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 169
 170        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 171                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 172                                 curl_low_speed_limit);
 173                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 174                                 curl_low_speed_time);
 175        }
 176
 177        curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 178
 179        if (getenv("GIT_CURL_VERBOSE"))
 180                curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 181
 182        curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
 183
 184        if (curl_ftp_no_epsv)
 185                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 186
 187        if (curl_http_proxy)
 188                curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 189
 190        return result;
 191}
 192
 193static void set_from_env(const char **var, const char *envname)
 194{
 195        const char *val = getenv(envname);
 196        if (val)
 197                *var = val;
 198}
 199
 200void http_init(struct remote *remote)
 201{
 202        char *low_speed_limit;
 203        char *low_speed_time;
 204
 205        git_config(http_options, NULL);
 206
 207        curl_global_init(CURL_GLOBAL_ALL);
 208
 209        if (remote && remote->http_proxy)
 210                curl_http_proxy = xstrdup(remote->http_proxy);
 211
 212        pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 213
 214#ifdef USE_CURL_MULTI
 215        {
 216                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 217                if (http_max_requests != NULL)
 218                        max_requests = atoi(http_max_requests);
 219        }
 220
 221        curlm = curl_multi_init();
 222        if (curlm == NULL) {
 223                fprintf(stderr, "Error creating curl multi handle.\n");
 224                exit(1);
 225        }
 226#endif
 227
 228        if (getenv("GIT_SSL_NO_VERIFY"))
 229                curl_ssl_verify = 0;
 230
 231        set_from_env(&ssl_cert, "GIT_SSL_CERT");
 232#if LIBCURL_VERSION_NUM >= 0x070902
 233        set_from_env(&ssl_key, "GIT_SSL_KEY");
 234#endif
 235#if LIBCURL_VERSION_NUM >= 0x070908
 236        set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 237#endif
 238        set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 239
 240        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 241        if (low_speed_limit != NULL)
 242                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 243        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 244        if (low_speed_time != NULL)
 245                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 246
 247        if (curl_ssl_verify == -1)
 248                curl_ssl_verify = 1;
 249
 250#ifdef USE_CURL_MULTI
 251        if (max_requests < 1)
 252                max_requests = DEFAULT_MAX_REQUESTS;
 253#endif
 254
 255        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 256                curl_ftp_no_epsv = 1;
 257
 258#ifndef NO_CURL_EASY_DUPHANDLE
 259        curl_default = get_curl_handle();
 260#endif
 261}
 262
 263void http_cleanup(void)
 264{
 265        struct active_request_slot *slot = active_queue_head;
 266
 267        while (slot != NULL) {
 268                struct active_request_slot *next = slot->next;
 269                if (slot->curl != NULL) {
 270#ifdef USE_CURL_MULTI
 271                        curl_multi_remove_handle(curlm, slot->curl);
 272#endif
 273                        curl_easy_cleanup(slot->curl);
 274                }
 275                free(slot);
 276                slot = next;
 277        }
 278        active_queue_head = NULL;
 279
 280#ifndef NO_CURL_EASY_DUPHANDLE
 281        curl_easy_cleanup(curl_default);
 282#endif
 283
 284#ifdef USE_CURL_MULTI
 285        curl_multi_cleanup(curlm);
 286#endif
 287        curl_global_cleanup();
 288
 289        curl_slist_free_all(pragma_header);
 290        pragma_header = NULL;
 291
 292        if (curl_http_proxy) {
 293                free((void *)curl_http_proxy);
 294                curl_http_proxy = NULL;
 295        }
 296}
 297
 298struct active_request_slot *get_active_slot(void)
 299{
 300        struct active_request_slot *slot = active_queue_head;
 301        struct active_request_slot *newslot;
 302
 303#ifdef USE_CURL_MULTI
 304        int num_transfers;
 305
 306        /* Wait for a slot to open up if the queue is full */
 307        while (active_requests >= max_requests) {
 308                curl_multi_perform(curlm, &num_transfers);
 309                if (num_transfers < active_requests)
 310                        process_curl_messages();
 311        }
 312#endif
 313
 314        while (slot != NULL && slot->in_use)
 315                slot = slot->next;
 316
 317        if (slot == NULL) {
 318                newslot = xmalloc(sizeof(*newslot));
 319                newslot->curl = NULL;
 320                newslot->in_use = 0;
 321                newslot->next = NULL;
 322
 323                slot = active_queue_head;
 324                if (slot == NULL) {
 325                        active_queue_head = newslot;
 326                } else {
 327                        while (slot->next != NULL)
 328                                slot = slot->next;
 329                        slot->next = newslot;
 330                }
 331                slot = newslot;
 332        }
 333
 334        if (slot->curl == NULL) {
 335#ifdef NO_CURL_EASY_DUPHANDLE
 336                slot->curl = get_curl_handle();
 337#else
 338                slot->curl = curl_easy_duphandle(curl_default);
 339#endif
 340        }
 341
 342        active_requests++;
 343        slot->in_use = 1;
 344        slot->local = NULL;
 345        slot->results = NULL;
 346        slot->finished = NULL;
 347        slot->callback_data = NULL;
 348        slot->callback_func = NULL;
 349        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 350        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 351        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 352        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 353        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 354        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 355        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 356
 357        return slot;
 358}
 359
 360int start_active_slot(struct active_request_slot *slot)
 361{
 362#ifdef USE_CURL_MULTI
 363        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 364        int num_transfers;
 365
 366        if (curlm_result != CURLM_OK &&
 367            curlm_result != CURLM_CALL_MULTI_PERFORM) {
 368                active_requests--;
 369                slot->in_use = 0;
 370                return 0;
 371        }
 372
 373        /*
 374         * We know there must be something to do, since we just added
 375         * something.
 376         */
 377        curl_multi_perform(curlm, &num_transfers);
 378#endif
 379        return 1;
 380}
 381
 382#ifdef USE_CURL_MULTI
 383struct fill_chain {
 384        void *data;
 385        int (*fill)(void *);
 386        struct fill_chain *next;
 387};
 388
 389static struct fill_chain *fill_cfg;
 390
 391void add_fill_function(void *data, int (*fill)(void *))
 392{
 393        struct fill_chain *new = xmalloc(sizeof(*new));
 394        struct fill_chain **linkp = &fill_cfg;
 395        new->data = data;
 396        new->fill = fill;
 397        new->next = NULL;
 398        while (*linkp)
 399                linkp = &(*linkp)->next;
 400        *linkp = new;
 401}
 402
 403void fill_active_slots(void)
 404{
 405        struct active_request_slot *slot = active_queue_head;
 406
 407        while (active_requests < max_requests) {
 408                struct fill_chain *fill;
 409                for (fill = fill_cfg; fill; fill = fill->next)
 410                        if (fill->fill(fill->data))
 411                                break;
 412
 413                if (!fill)
 414                        break;
 415        }
 416
 417        while (slot != NULL) {
 418                if (!slot->in_use && slot->curl != NULL) {
 419                        curl_easy_cleanup(slot->curl);
 420                        slot->curl = NULL;
 421                }
 422                slot = slot->next;
 423        }
 424}
 425
 426void step_active_slots(void)
 427{
 428        int num_transfers;
 429        CURLMcode curlm_result;
 430
 431        do {
 432                curlm_result = curl_multi_perform(curlm, &num_transfers);
 433        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 434        if (num_transfers < active_requests) {
 435                process_curl_messages();
 436                fill_active_slots();
 437        }
 438}
 439#endif
 440
 441void run_active_slot(struct active_request_slot *slot)
 442{
 443#ifdef USE_CURL_MULTI
 444        long last_pos = 0;
 445        long current_pos;
 446        fd_set readfds;
 447        fd_set writefds;
 448        fd_set excfds;
 449        int max_fd;
 450        struct timeval select_timeout;
 451        int finished = 0;
 452
 453        slot->finished = &finished;
 454        while (!finished) {
 455                data_received = 0;
 456                step_active_slots();
 457
 458                if (!data_received && slot->local != NULL) {
 459                        current_pos = ftell(slot->local);
 460                        if (current_pos > last_pos)
 461                                data_received++;
 462                        last_pos = current_pos;
 463                }
 464
 465                if (slot->in_use && !data_received) {
 466                        max_fd = 0;
 467                        FD_ZERO(&readfds);
 468                        FD_ZERO(&writefds);
 469                        FD_ZERO(&excfds);
 470                        select_timeout.tv_sec = 0;
 471                        select_timeout.tv_usec = 50000;
 472                        select(max_fd, &readfds, &writefds,
 473                               &excfds, &select_timeout);
 474                }
 475        }
 476#else
 477        while (slot->in_use) {
 478                slot->curl_result = curl_easy_perform(slot->curl);
 479                finish_active_slot(slot);
 480        }
 481#endif
 482}
 483
 484static void closedown_active_slot(struct active_request_slot *slot)
 485{
 486        active_requests--;
 487        slot->in_use = 0;
 488}
 489
 490void release_active_slot(struct active_request_slot *slot)
 491{
 492        closedown_active_slot(slot);
 493        if (slot->curl) {
 494#ifdef USE_CURL_MULTI
 495                curl_multi_remove_handle(curlm, slot->curl);
 496#endif
 497                curl_easy_cleanup(slot->curl);
 498                slot->curl = NULL;
 499        }
 500#ifdef USE_CURL_MULTI
 501        fill_active_slots();
 502#endif
 503}
 504
 505static void finish_active_slot(struct active_request_slot *slot)
 506{
 507        closedown_active_slot(slot);
 508        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 509
 510        if (slot->finished != NULL)
 511                (*slot->finished) = 1;
 512
 513        /* Store slot results so they can be read after the slot is reused */
 514        if (slot->results != NULL) {
 515                slot->results->curl_result = slot->curl_result;
 516                slot->results->http_code = slot->http_code;
 517        }
 518
 519        /* Run callback if appropriate */
 520        if (slot->callback_func != NULL)
 521                slot->callback_func(slot->callback_data);
 522}
 523
 524void finish_all_active_slots(void)
 525{
 526        struct active_request_slot *slot = active_queue_head;
 527
 528        while (slot != NULL)
 529                if (slot->in_use) {
 530                        run_active_slot(slot);
 531                        slot = active_queue_head;
 532                } else {
 533                        slot = slot->next;
 534                }
 535}
 536
 537static inline int needs_quote(int ch)
 538{
 539        if (((ch >= 'A') && (ch <= 'Z'))
 540                        || ((ch >= 'a') && (ch <= 'z'))
 541                        || ((ch >= '0') && (ch <= '9'))
 542                        || (ch == '/')
 543                        || (ch == '-')
 544                        || (ch == '.'))
 545                return 0;
 546        return 1;
 547}
 548
 549static inline int hex(int v)
 550{
 551        if (v < 10)
 552                return '0' + v;
 553        else
 554                return 'A' + v - 10;
 555}
 556
 557static char *quote_ref_url(const char *base, const char *ref)
 558{
 559        struct strbuf buf = STRBUF_INIT;
 560        const char *cp;
 561        int ch;
 562
 563        strbuf_addstr(&buf, base);
 564        if (buf.len && buf.buf[buf.len - 1] != '/' && *ref != '/')
 565                strbuf_addstr(&buf, "/");
 566
 567        for (cp = ref; (ch = *cp) != 0; cp++)
 568                if (needs_quote(ch))
 569                        strbuf_addf(&buf, "%%%02x", ch);
 570                else
 571                        strbuf_addch(&buf, *cp);
 572
 573        return strbuf_detach(&buf, NULL);
 574}
 575
 576int http_fetch_ref(const char *base, struct ref *ref)
 577{
 578        char *url;
 579        struct strbuf buffer = STRBUF_INIT;
 580        struct active_request_slot *slot;
 581        struct slot_results results;
 582        int ret;
 583
 584        url = quote_ref_url(base, ref->name);
 585        slot = get_active_slot();
 586        slot->results = &results;
 587        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 588        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 589        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 590        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 591        if (start_active_slot(slot)) {
 592                run_active_slot(slot);
 593                if (results.curl_result == CURLE_OK) {
 594                        strbuf_rtrim(&buffer);
 595                        if (buffer.len == 40)
 596                                ret = get_sha1_hex(buffer.buf, ref->old_sha1);
 597                        else if (!prefixcmp(buffer.buf, "ref: ")) {
 598                                ref->symref = xstrdup(buffer.buf + 5);
 599                                ret = 0;
 600                        } else
 601                                ret = 1;
 602                } else {
 603                        ret = error("Couldn't get %s for %s\n%s",
 604                                    url, ref->name, curl_errorstr);
 605                }
 606        } else {
 607                ret = error("Unable to start request");
 608        }
 609
 610        strbuf_release(&buffer);
 611        free(url);
 612        return ret;
 613}