engines/http.c

   1 /*
   2  * HTTP GET/PUT IO engine
   3  *
   4  * IO engine to perform HTTP(S) GET/PUT requests via libcurl-easy.
   5  *
   6  * Copyright (C) 2018 SUSE LLC
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License,
  10  * version 2 as published by the Free Software Foundation..
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public
  18  * License along with this program; if not, write to the Free
  19  * Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20  * Boston, MA 02110-1301, USA.
  21  */
  22
  23 #include <pthread.h>
  24 #include <time.h>
  25 #include <curl/curl.h>
  26 #include <openssl/hmac.h>
  27 #include <openssl/sha.h>
  28 #include <openssl/md5.h>
  29 #include "fio.h"
  30 #include "../optgroup.h"
  31
  32
  33 enum {
  34         FIO_HTTP_WEBDAV     = 0,
  35         FIO_HTTP_S3         = 1,
  36         FIO_HTTP_SWIFT      = 2,
  37
  38         FIO_HTTPS_OFF       = 0,
  39         FIO_HTTPS_ON        = 1,
  40         FIO_HTTPS_INSECURE  = 2,
  41 };
  42
  43 struct http_data {
  44         CURL *curl;
  45 };
  46
  47 struct http_options {
  48         void *pad;
  49         unsigned int https;
  50         char *host;
  51         char *user;
  52         char *pass;
  53         char *s3_key;
  54         char *s3_keyid;
  55         char *s3_region;
  56         char *swift_auth_token;
  57         int verbose;
  58         unsigned int mode;
  59 };
  60
  61 struct http_curl_stream {
  62         char *buf;
  63         size_t pos;
  64         size_t max;
  65 };
  66
  67 static struct fio_option options[] = {
  68         {
  69                 .name     = "https",
  70                 .lname    = "https",
  71                 .type     = FIO_OPT_STR,
  72                 .help     = "Enable https",
  73                 .off1     = offsetof(struct http_options, https),
  74                 .def      = "off",
  75                 .posval = {
  76                           { .ival = "off",
  77                             .oval = FIO_HTTPS_OFF,
  78                             .help = "No HTTPS",
  79                           },
  80                           { .ival = "on",
  81                             .oval = FIO_HTTPS_ON,
  82                             .help = "Enable HTTPS",
  83                           },
  84                           { .ival = "insecure",
  85                             .oval = FIO_HTTPS_INSECURE,
  86                             .help = "Enable HTTPS, disable peer verification",
  87                           },
  88                 },
  89                 .category = FIO_OPT_C_ENGINE,
  90                 .group    = FIO_OPT_G_HTTP,
  91         },
  92         {
  93                 .name     = "http_host",
  94                 .lname    = "http_host",
  95                 .type     = FIO_OPT_STR_STORE,
  96                 .help     = "Hostname (S3 bucket)",
  97                 .off1     = offsetof(struct http_options, host),
  98                 .def      = "localhost",
  99                 .category = FIO_OPT_C_ENGINE,
 100                 .group    = FIO_OPT_G_HTTP,
 101         },
 102         {
 103                 .name     = "http_user",
 104                 .lname    = "http_user",
 105                 .type     = FIO_OPT_STR_STORE,
 106                 .help     = "HTTP user name",
 107                 .off1     = offsetof(struct http_options, user),
 108                 .category = FIO_OPT_C_ENGINE,
 109                 .group    = FIO_OPT_G_HTTP,
 110         },
 111         {
 112                 .name     = "http_pass",
 113                 .lname    = "http_pass",
 114                 .type     = FIO_OPT_STR_STORE,
 115                 .help     = "HTTP password",
 116                 .off1     = offsetof(struct http_options, pass),
 117                 .category = FIO_OPT_C_ENGINE,
 118                 .group    = FIO_OPT_G_HTTP,
 119         },
 120         {
 121                 .name     = "http_s3_key",
 122                 .lname    = "S3 secret key",
 123                 .type     = FIO_OPT_STR_STORE,
 124                 .help     = "S3 secret key",
 125                 .off1     = offsetof(struct http_options, s3_key),
 126                 .def      = "",
 127                 .category = FIO_OPT_C_ENGINE,
 128                 .group    = FIO_OPT_G_HTTP,
 129         },
 130         {
 131                 .name     = "http_s3_keyid",
 132                 .lname    = "S3 key id",
 133                 .type     = FIO_OPT_STR_STORE,
 134                 .help     = "S3 key id",
 135                 .off1     = offsetof(struct http_options, s3_keyid),
 136                 .def      = "",
 137                 .category = FIO_OPT_C_ENGINE,
 138                 .group    = FIO_OPT_G_HTTP,
 139         },
 140         {
 141                 .name     = "http_swift_auth_token",
 142                 .lname    = "Swift auth token",
 143                 .type     = FIO_OPT_STR_STORE,
 144                 .help     = "OpenStack Swift auth token",
 145                 .off1     = offsetof(struct http_options, swift_auth_token),
 146                 .def      = "",
 147                 .category = FIO_OPT_C_ENGINE,
 148                 .group    = FIO_OPT_G_HTTP,
 149         },
 150         {
 151                 .name     = "http_s3_region",
 152                 .lname    = "S3 region",
 153                 .type     = FIO_OPT_STR_STORE,
 154                 .help     = "S3 region",
 155                 .off1     = offsetof(struct http_options, s3_region),
 156                 .def      = "us-east-1",
 157                 .category = FIO_OPT_C_ENGINE,
 158                 .group    = FIO_OPT_G_HTTP,
 159         },
 160         {
 161                 .name     = "http_mode",
 162                 .lname    = "Request mode to use",
 163                 .type     = FIO_OPT_STR,
 164                 .help     = "Whether to use WebDAV, Swift, or S3",
 165                 .off1     = offsetof(struct http_options, mode),
 166                 .def      = "webdav",
 167                 .posval = {
 168                           { .ival = "webdav",
 169                             .oval = FIO_HTTP_WEBDAV,
 170                             .help = "WebDAV server",
 171                           },
 172                           { .ival = "s3",
 173                             .oval = FIO_HTTP_S3,
 174                             .help = "S3 storage backend",
 175                           },
 176                           { .ival = "swift",
 177                             .oval = FIO_HTTP_SWIFT,
 178                             .help = "OpenStack Swift storage",
 179                           },
 180                 },
 181                 .category = FIO_OPT_C_ENGINE,
 182                 .group    = FIO_OPT_G_HTTP,
 183         },
 184         {
 185                 .name     = "http_verbose",
 186                 .lname    = "HTTP verbosity level",
 187                 .type     = FIO_OPT_INT,
 188                 .help     = "increase http engine verbosity",
 189                 .off1     = offsetof(struct http_options, verbose),
 190                 .def      = "0",
 191                 .category = FIO_OPT_C_ENGINE,
 192                 .group    = FIO_OPT_G_HTTP,
 193         },
 194         {
 195                 .name     = NULL,
 196         },
 197 };
 198
 199 static char *_aws_uriencode(const char *uri)
 200 {
 201         size_t bufsize = 1024;
 202         char *r = malloc(bufsize);
 203         char c;
 204         int i, n;
 205         const char *hex = "0123456789ABCDEF";
 206
 207         if (!r) {
 208                 log_err("malloc failed\n");
 209                 return NULL;
 210         }
 211
 212         n = 0;
 213         for (i = 0; (c = uri[i]); i++) {
 214                 if (n > bufsize-5) {
 215                         log_err("encoding the URL failed\n");
 216                         return NULL;
 217                 }
 218
 219                 if ( (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z')
 220                 || (c >= '0' && c <= '9') || c == '_' || c == '-'
 221                 || c == '~' || c == '.' || c == '/')
 222                         r[n++] = c;
 223                 else {
 224                         r[n++] = '%';
 225                         r[n++] = hex[(c >> 4 ) & 0xF];
 226                         r[n++] = hex[c & 0xF];
 227                 }
 228         }
 229         r[n++] = 0;
 230         return r;
 231 }
 232
 233 static char *_conv_hex(const unsigned char *p, size_t len)
 234 {
 235         char *r;
 236         int i,n;
 237         const char *hex = "0123456789abcdef";
 238         r = malloc(len * 2 + 1);
 239         n = 0;
 240         for (i = 0; i < len; i++) {
 241                 r[n++] = hex[(p[i] >> 4 ) & 0xF];
 242                 r[n++] = hex[p[i] & 0xF];
 243         }
 244         r[n] = 0;
 245
 246         return r;
 247 }
 248
 249 static char *_gen_hex_sha256(const char *p, size_t len)
 250 {
 251         unsigned char hash[SHA256_DIGEST_LENGTH];
 252
 253         SHA256((unsigned char*)p, len, hash);
 254         return _conv_hex(hash, SHA256_DIGEST_LENGTH);
 255 }
 256
 257 static char *_gen_hex_md5(const char *p, size_t len)
 258 {
 259         unsigned char hash[MD5_DIGEST_LENGTH];
 260
 261         MD5((unsigned char*)p, len, hash);
 262         return _conv_hex(hash, MD5_DIGEST_LENGTH);
 263 }
 264
 265 static void _hmac(unsigned char *md, void *key, int key_len, char *data) {
 266 #ifndef CONFIG_HAVE_OPAQUE_HMAC_CTX
 267         HMAC_CTX _ctx;
 268 #endif
 269         HMAC_CTX *ctx;
 270         unsigned int hmac_len;
 271
 272 #ifdef CONFIG_HAVE_OPAQUE_HMAC_CTX
 273         ctx = HMAC_CTX_new();
 274 #else
 275         ctx = &_ctx;
 276         /* work-around crash in certain versions of libssl */
 277         HMAC_CTX_init(ctx);
 278 #endif
 279         HMAC_Init_ex(ctx, key, key_len, EVP_sha256(), NULL);
 280         HMAC_Update(ctx, (unsigned char*)data, strlen(data));
 281         HMAC_Final(ctx, md, &hmac_len);
 282 #ifdef CONFIG_HAVE_OPAQUE_HMAC_CTX
 283         HMAC_CTX_free(ctx);
 284 #else
 285         HMAC_CTX_cleanup(ctx);
 286 #endif
 287 }
 288
 289 static int _curl_trace(CURL *handle, curl_infotype type,
 290              char *data, size_t size,
 291              void *userp)
 292 {
 293         const char *text;
 294         (void)handle; /* prevent compiler warning */
 295         (void)userp;
 296
 297         switch (type) {
 298         case CURLINFO_TEXT:
 299         fprintf(stderr, "== Info: %s", data);
 300         default:
 301         case CURLINFO_SSL_DATA_OUT:
 302         case CURLINFO_SSL_DATA_IN:
 303                 return 0;
 304
 305         case CURLINFO_HEADER_OUT:
 306                 text = "=> Send header";
 307                 break;
 308         case CURLINFO_DATA_OUT:
 309                 text = "=> Send data";
 310                 break;
 311         case CURLINFO_HEADER_IN:
 312                 text = "<= Recv header";
 313                 break;
 314         case CURLINFO_DATA_IN:
 315                 text = "<= Recv data";
 316                 break;
 317         }
 318
 319         log_info("%s: %s", text, data);
 320         return 0;
 321 }
 322
 323 /* https://docs.aws.amazon.com/AmazonS3/latest/API/sig-v4-header-based-auth.html
 324  * https://docs.aws.amazon.com/AmazonS3/latest/API/sig-v4-authenticating-requests.html#signing-request-intro
 325  */
 326 static void _add_aws_auth_header(CURL *curl, struct curl_slist *slist, struct http_options *o,
 327                 int op, const char *uri, char *buf, size_t len)
 328 {
 329         char date_short[16];
 330         char date_iso[32];
 331         char method[8];
 332         char dkey[128];
 333         char creq[512];
 334         char sts[256];
 335         char s[512];
 336         char *uri_encoded = NULL;
 337         char *dsha = NULL;
 338         char *csha = NULL;
 339         char *signature = NULL;
 340         const char *service = "s3";
 341         const char *aws = "aws4_request";
 342         unsigned char md[SHA256_DIGEST_LENGTH];
 343
 344         time_t t = time(NULL);
 345         struct tm *gtm = gmtime(&t);
 346
 347         strftime (date_short, sizeof(date_short), "%Y%m%d", gtm);
 348         strftime (date_iso, sizeof(date_iso), "%Y%m%dT%H%M%SZ", gtm);
 349         uri_encoded = _aws_uriencode(uri);
 350
 351         if (op == DDIR_WRITE) {
 352                 dsha = _gen_hex_sha256(buf, len);
 353                 sprintf(method, "PUT");
 354         } else {
 355                 /* DDIR_READ && DDIR_TRIM supply an empty body */
 356                 if (op == DDIR_READ)
 357                         sprintf(method, "GET");
 358                 else
 359                         sprintf(method, "DELETE");
 360                 dsha = _gen_hex_sha256("", 0);
 361         }
 362
 363         /* Create the canonical request first */
 364         snprintf(creq, sizeof(creq),
 365         "%s\n"
 366         "%s\n"
 367         "\n"
 368         "host:%s\n"
 369         "x-amz-content-sha256:%s\n"
 370         "x-amz-date:%s\n"
 371         "\n"
 372         "host;x-amz-content-sha256;x-amz-date\n"
 373         "%s"
 374         , method
 375         , uri_encoded, o->host, dsha, date_iso, dsha);
 376
 377         csha = _gen_hex_sha256(creq, strlen(creq));
 378         snprintf(sts, sizeof(sts), "AWS4-HMAC-SHA256\n%s\n%s/%s/%s/%s\n%s",
 379                 date_iso, date_short, o->s3_region, service, aws, csha);
 380
 381         snprintf((char *)dkey, sizeof(dkey), "AWS4%s", o->s3_key);
 382         _hmac(md, dkey, strlen(dkey), date_short);
 383         _hmac(md, md, SHA256_DIGEST_LENGTH, o->s3_region);
 384         _hmac(md, md, SHA256_DIGEST_LENGTH, (char*) service);
 385         _hmac(md, md, SHA256_DIGEST_LENGTH, (char*) aws);
 386         _hmac(md, md, SHA256_DIGEST_LENGTH, sts);
 387
 388         signature = _conv_hex(md, SHA256_DIGEST_LENGTH);
 389
 390         /* Surpress automatic Accept: header */
 391         slist = curl_slist_append(slist, "Accept:");
 392
 393         snprintf(s, sizeof(s), "x-amz-content-sha256: %s", dsha);
 394         slist = curl_slist_append(slist, s);
 395
 396         snprintf(s, sizeof(s), "x-amz-date: %s", date_iso);
 397         slist = curl_slist_append(slist, s);
 398
 399         snprintf(s, sizeof(s), "Authorization: AWS4-HMAC-SHA256 Credential=%s/%s/%s/s3/aws4_request,"
 400         "SignedHeaders=host;x-amz-content-sha256;x-amz-date,Signature=%s",
 401         o->s3_keyid, date_short, o->s3_region, signature);
 402         slist = curl_slist_append(slist, s);
 403
 404         curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
 405
 406         free(uri_encoded);
 407         free(csha);
 408         free(dsha);
 409         free(signature);
 410 }
 411
 412 static void _add_swift_header(CURL *curl, struct curl_slist *slist, struct http_options *o,
 413                 int op, const char *uri, char *buf, size_t len)
 414 {
 415         char *dsha = NULL;
 416         char s[512];
 417
 418         if (op == DDIR_WRITE) {
 419                 dsha = _gen_hex_md5(buf, len);
 420         }
 421         /* Surpress automatic Accept: header */
 422         slist = curl_slist_append(slist, "Accept:");
 423
 424         snprintf(s, sizeof(s), "etag: %s", dsha);
 425         slist = curl_slist_append(slist, s);
 426
 427         snprintf(s, sizeof(s), "x-auth-token: %s", o->swift_auth_token);
 428         slist = curl_slist_append(slist, s);
 429
 430         curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
 431
 432         free(dsha);
 433 }
 434
 435 static void fio_http_cleanup(struct thread_data *td)
 436 {
 437         struct http_data *http = td->io_ops_data;
 438
 439         if (http) {
 440                 curl_easy_cleanup(http->curl);
 441                 free(http);
 442         }
 443 }
 444
 445 static size_t _http_read(void *ptr, size_t size, size_t nmemb, void *stream)
 446 {
 447         struct http_curl_stream *state = stream;
 448         size_t len = size * nmemb;
 449         /* We're retrieving; nothing is supposed to be read locally */
 450         if (!stream)
 451                 return 0;
 452         if (len+state->pos > state->max)
 453                 len = state->max - state->pos;
 454         memcpy(ptr, &state->buf[state->pos], len);
 455         state->pos += len;
 456         return len;
 457 }
 458
 459 static size_t _http_write(void *ptr, size_t size, size_t nmemb, void *stream)
 460 {
 461         struct http_curl_stream *state = stream;
 462         /* We're just discarding the returned body after a PUT */
 463         if (!stream)
 464                 return nmemb;
 465         if (size != 1)
 466                 return CURLE_WRITE_ERROR;
 467         if (nmemb + state->pos > state->max)
 468                 return CURLE_WRITE_ERROR;
 469         memcpy(&state->buf[state->pos], ptr, nmemb);
 470         state->pos += nmemb;
 471         return nmemb;
 472 }
 473
 474 static int _http_seek(void *stream, curl_off_t offset, int origin)
 475 {
 476         struct http_curl_stream *state = stream;
 477         if (offset < state->max && origin == SEEK_SET) {
 478                 state->pos = offset;
 479                 return CURL_SEEKFUNC_OK;
 480         } else
 481                 return CURL_SEEKFUNC_FAIL;
 482 }
 483
 484 static enum fio_q_status fio_http_queue(struct thread_data *td,
 485                                          struct io_u *io_u)
 486 {
 487         struct http_data *http = td->io_ops_data;
 488         struct http_options *o = td->eo;
 489         struct http_curl_stream _curl_stream;
 490         struct curl_slist *slist = NULL;
 491         char object[512];
 492         char url[1024];
 493         long status;
 494         CURLcode res;
 495         int r = -1;
 496
 497         fio_ro_check(td, io_u);
 498         memset(&_curl_stream, 0, sizeof(_curl_stream));
 499         snprintf(object, sizeof(object), "%s_%llu_%llu", td->files[0]->file_name,
 500                 io_u->offset, io_u->xfer_buflen);
 501         if (o->https == FIO_HTTPS_OFF)
 502                 snprintf(url, sizeof(url), "http://%s%s", o->host, object);
 503         else
 504                 snprintf(url, sizeof(url), "https://%s%s", o->host, object);
 505         curl_easy_setopt(http->curl, CURLOPT_URL, url);
 506         _curl_stream.buf = io_u->xfer_buf;
 507         _curl_stream.max = io_u->xfer_buflen;
 508         curl_easy_setopt(http->curl, CURLOPT_SEEKDATA, &_curl_stream);
 509         curl_easy_setopt(http->curl, CURLOPT_INFILESIZE_LARGE, (curl_off_t)io_u->xfer_buflen);
 510
 511         if (o->mode == FIO_HTTP_S3)
 512                 _add_aws_auth_header(http->curl, slist, o, io_u->ddir, object,
 513                         io_u->xfer_buf, io_u->xfer_buflen);
 514         else if (o->mode == FIO_HTTP_SWIFT)
 515                 _add_swift_header(http->curl, slist, o, io_u->ddir, object,
 516                         io_u->xfer_buf, io_u->xfer_buflen);
 517
 518         if (io_u->ddir == DDIR_WRITE) {
 519                 curl_easy_setopt(http->curl, CURLOPT_READDATA, &_curl_stream);
 520                 curl_easy_setopt(http->curl, CURLOPT_WRITEDATA, NULL);
 521                 curl_easy_setopt(http->curl, CURLOPT_UPLOAD, 1L);
 522                 res = curl_easy_perform(http->curl);
 523                 if (res == CURLE_OK) {
 524                         curl_easy_getinfo(http->curl, CURLINFO_RESPONSE_CODE, &status);
 525                         if (status == 100 || (status >= 200 && status <= 204))
 526                                 goto out;
 527                         log_err("DDIR_WRITE failed with HTTP status code %ld\n", status);
 528                         goto err;
 529                 }
 530         } else if (io_u->ddir == DDIR_READ) {
 531                 curl_easy_setopt(http->curl, CURLOPT_READDATA, NULL);
 532                 curl_easy_setopt(http->curl, CURLOPT_WRITEDATA, &_curl_stream);
 533                 curl_easy_setopt(http->curl, CURLOPT_HTTPGET, 1L);
 534                 res = curl_easy_perform(http->curl);
 535                 if (res == CURLE_OK) {
 536                         curl_easy_getinfo(http->curl, CURLINFO_RESPONSE_CODE, &status);
 537                         if (status == 200)
 538                                 goto out;
 539                         else if (status == 404) {
 540                                 /* Object doesn't exist. Pretend we read
 541                                  * zeroes */
 542                                 memset(io_u->xfer_buf, 0, io_u->xfer_buflen);
 543                                 goto out;
 544                         }
 545                         log_err("DDIR_READ failed with HTTP status code %ld\n", status);
 546                 }
 547                 goto err;
 548         } else if (io_u->ddir == DDIR_TRIM) {
 549                 curl_easy_setopt(http->curl, CURLOPT_HTTPGET, 1L);
 550                 curl_easy_setopt(http->curl, CURLOPT_CUSTOMREQUEST, "DELETE");
 551                 curl_easy_setopt(http->curl, CURLOPT_INFILESIZE_LARGE, (curl_off_t)0);
 552                 curl_easy_setopt(http->curl, CURLOPT_READDATA, NULL);
 553                 curl_easy_setopt(http->curl, CURLOPT_WRITEDATA, NULL);
 554                 res = curl_easy_perform(http->curl);
 555                 if (res == CURLE_OK) {
 556                         curl_easy_getinfo(http->curl, CURLINFO_RESPONSE_CODE, &status);
 557                         if (status == 200 || status == 202 || status == 204 || status == 404)
 558                                 goto out;
 559                         log_err("DDIR_TRIM failed with HTTP status code %ld\n", status);
 560                 }
 561                 goto err;
 562         }
 563
 564         log_err("WARNING: Only DDIR_READ/DDIR_WRITE/DDIR_TRIM are supported!\n");
 565
 566 err:
 567         io_u->error = r;
 568         td_verror(td, io_u->error, "transfer");
 569 out:
 570         curl_slist_free_all(slist);
 571         return FIO_Q_COMPLETED;
 572 }
 573
 574 static struct io_u *fio_http_event(struct thread_data *td, int event)
 575 {
 576         /* sync IO engine - never any outstanding events */
 577         return NULL;
 578 }
 579
 580 int fio_http_getevents(struct thread_data *td, unsigned int min,
 581         unsigned int max, const struct timespec *t)
 582 {
 583         /* sync IO engine - never any outstanding events */
 584         return 0;
 585 }
 586
 587 static int fio_http_setup(struct thread_data *td)
 588 {
 589         struct http_data *http = NULL;
 590         struct http_options *o = td->eo;
 591
 592         /* allocate engine specific structure to deal with libhttp. */
 593         http = calloc(1, sizeof(*http));
 594         if (!http) {
 595                 log_err("calloc failed.\n");
 596                 goto cleanup;
 597         }
 598
 599         http->curl = curl_easy_init();
 600         if (o->verbose)
 601                 curl_easy_setopt(http->curl, CURLOPT_VERBOSE, 1L);
 602         if (o->verbose > 1)
 603                 curl_easy_setopt(http->curl, CURLOPT_DEBUGFUNCTION, &_curl_trace);
 604         curl_easy_setopt(http->curl, CURLOPT_NOPROGRESS, 1L);
 605         curl_easy_setopt(http->curl, CURLOPT_FOLLOWLOCATION, 1L);
 606         curl_easy_setopt(http->curl, CURLOPT_PROTOCOLS, CURLPROTO_HTTP|CURLPROTO_HTTPS);
 607         if (o->https == FIO_HTTPS_INSECURE) {
 608                 curl_easy_setopt(http->curl, CURLOPT_SSL_VERIFYPEER, 0L);
 609                 curl_easy_setopt(http->curl, CURLOPT_SSL_VERIFYHOST, 0L);
 610         }
 611         curl_easy_setopt(http->curl, CURLOPT_READFUNCTION, _http_read);
 612         curl_easy_setopt(http->curl, CURLOPT_WRITEFUNCTION, _http_write);
 613         curl_easy_setopt(http->curl, CURLOPT_SEEKFUNCTION, &_http_seek);
 614         if (o->user && o->pass) {
 615                 curl_easy_setopt(http->curl, CURLOPT_USERNAME, o->user);
 616                 curl_easy_setopt(http->curl, CURLOPT_PASSWORD, o->pass);
 617                 curl_easy_setopt(http->curl, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 618         }
 619
 620         td->io_ops_data = http;
 621
 622         /* Force single process mode. */
 623         td->o.use_thread = 1;
 624
 625         return 0;
 626 cleanup:
 627         fio_http_cleanup(td);
 628         return 1;
 629 }
 630
 631 static int fio_http_open(struct thread_data *td, struct fio_file *f)
 632 {
 633         return 0;
 634 }
 635 static int fio_http_invalidate(struct thread_data *td, struct fio_file *f)
 636 {
 637         return 0;
 638 }
 639
 640 static struct ioengine_ops ioengine = {
 641         .name = "http",
 642         .version                = FIO_IOOPS_VERSION,
 643         .flags                  = FIO_DISKLESSIO,
 644         .setup                  = fio_http_setup,
 645         .queue                  = fio_http_queue,
 646         .getevents              = fio_http_getevents,
 647         .event                  = fio_http_event,
 648         .cleanup                = fio_http_cleanup,
 649         .open_file              = fio_http_open,
 650         .invalidate             = fio_http_invalidate,
 651         .options                = options,
 652         .option_struct_size     = sizeof(struct http_options),
 653 };
 654
 655 static void fio_init fio_http_register(void)
 656 {
 657         register_ioengine(&ioengine);
 658 }
 659
 660 static void fio_exit fio_http_unregister(void)
 661 {
 662         unregister_ioengine(&ioengine);
 663 }