[fio.git] / engines / http.c

/*
 * HTTP GET/PUT IO engine
 *
 * IO engine to perform HTTP(S) GET/PUT requests via libcurl-easy.
 *
 * Copyright (C) 2018 SUSE LLC
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License,
 * version 2 as published by the Free Software Foundation..
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#include <pthread.h>
#include <time.h>
#include <curl/curl.h>
#include <openssl/hmac.h>
#include <openssl/sha.h>
#include <openssl/md5.h>
#include "fio.h"
#include "../optgroup.h"


enum {
	FIO_HTTP_WEBDAV	    = 0,
	FIO_HTTP_S3	    = 1,
	FIO_HTTP_SWIFT	    = 2,

	FIO_HTTPS_OFF	    = 0,
	FIO_HTTPS_ON	    = 1,
	FIO_HTTPS_INSECURE  = 2,
};

struct http_data {
	CURL *curl;
};

struct http_options {
	void *pad;
	unsigned int https;
	char *host;
	char *user;
	char *pass;
	char *s3_key;
	char *s3_keyid;
	char *s3_region;
	char *swift_auth_token;
	int verbose;
	unsigned int mode;
};

struct http_curl_stream {
	char *buf;
	size_t pos;
	size_t max;
};

static struct fio_option options[] = {
	{
		.name     = "https",
		.lname    = "https",
		.type     = FIO_OPT_STR,
		.help     = "Enable https",
		.off1     = offsetof(struct http_options, https),
		.def      = "off",
		.posval = {
			  { .ival = "off",
			    .oval = FIO_HTTPS_OFF,
			    .help = "No HTTPS",
			  },
			  { .ival = "on",
			    .oval = FIO_HTTPS_ON,
			    .help = "Enable HTTPS",
			  },
			  { .ival = "insecure",
			    .oval = FIO_HTTPS_INSECURE,
			    .help = "Enable HTTPS, disable peer verification",
			  },
		},
		.category = FIO_OPT_C_ENGINE,
		.group    = FIO_OPT_G_HTTP,
	},
	{
		.name     = "http_host",
		.lname    = "http_host",
		.type     = FIO_OPT_STR_STORE,
		.help     = "Hostname (S3 bucket)",
		.off1     = offsetof(struct http_options, host),
		.def	  = "localhost",
		.category = FIO_OPT_C_ENGINE,
		.group    = FIO_OPT_G_HTTP,
	},
	{
		.name     = "http_user",
		.lname    = "http_user",
		.type     = FIO_OPT_STR_STORE,
		.help     = "HTTP user name",
		.off1     = offsetof(struct http_options, user),
		.category = FIO_OPT_C_ENGINE,
		.group    = FIO_OPT_G_HTTP,
	},
	{
		.name     = "http_pass",
		.lname    = "http_pass",
		.type     = FIO_OPT_STR_STORE,
		.help     = "HTTP password",
		.off1     = offsetof(struct http_options, pass),
		.category = FIO_OPT_C_ENGINE,
		.group    = FIO_OPT_G_HTTP,
	},
	{
		.name     = "http_s3_key",
		.lname    = "S3 secret key",
		.type     = FIO_OPT_STR_STORE,
		.help     = "S3 secret key",
		.off1     = offsetof(struct http_options, s3_key),
		.def	  = "",
		.category = FIO_OPT_C_ENGINE,
		.group    = FIO_OPT_G_HTTP,
	},
	{
		.name     = "http_s3_keyid",
		.lname    = "S3 key id",
		.type     = FIO_OPT_STR_STORE,
		.help     = "S3 key id",
		.off1     = offsetof(struct http_options, s3_keyid),
		.def	  = "",
		.category = FIO_OPT_C_ENGINE,
		.group    = FIO_OPT_G_HTTP,
	},
	{
		.name     = "http_swift_auth_token",
		.lname    = "Swift auth token",
		.type     = FIO_OPT_STR_STORE,
		.help     = "OpenStack Swift auth token",
		.off1     = offsetof(struct http_options, swift_auth_token),
		.def	  = "",
		.category = FIO_OPT_C_ENGINE,
		.group    = FIO_OPT_G_HTTP,
	},
	{
		.name     = "http_s3_region",
		.lname    = "S3 region",
		.type     = FIO_OPT_STR_STORE,
		.help     = "S3 region",
		.off1     = offsetof(struct http_options, s3_region),
		.def	  = "us-east-1",
		.category = FIO_OPT_C_ENGINE,
		.group    = FIO_OPT_G_HTTP,
	},
	{
		.name     = "http_mode",
		.lname    = "Request mode to use",
		.type     = FIO_OPT_STR,
		.help     = "Whether to use WebDAV, Swift, or S3",
		.off1     = offsetof(struct http_options, mode),
		.def	  = "webdav",
		.posval = {
			  { .ival = "webdav",
			    .oval = FIO_HTTP_WEBDAV,
			    .help = "WebDAV server",
			  },
			  { .ival = "s3",
			    .oval = FIO_HTTP_S3,
			    .help = "S3 storage backend",
			  },
			  { .ival = "swift",
			    .oval = FIO_HTTP_SWIFT,
			    .help = "OpenStack Swift storage",
			  },
		},
		.category = FIO_OPT_C_ENGINE,
		.group    = FIO_OPT_G_HTTP,
	},
	{
		.name     = "http_verbose",
		.lname    = "HTTP verbosity level",
		.type     = FIO_OPT_INT,
		.help     = "increase http engine verbosity",
		.off1     = offsetof(struct http_options, verbose),
		.def	  = "0",
		.category = FIO_OPT_C_ENGINE,
		.group    = FIO_OPT_G_HTTP,
	},
	{
		.name     = NULL,
	},
};

static char *_aws_uriencode(const char *uri)
{
	size_t bufsize = 1024;
	char *r = malloc(bufsize);
	char c;
	int i, n;
	const char *hex = "0123456789ABCDEF";

	if (!r) {
		log_err("malloc failed\n");
		return NULL;
	}

	n = 0;
	for (i = 0; (c = uri[i]); i++) {
		if (n > bufsize-5) {
			log_err("encoding the URL failed\n");
			return NULL;
		}

		if ( (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z')
		|| (c >= '0' && c <= '9') || c == '_' || c == '-'
		|| c == '~' || c == '.' || c == '/')
			r[n++] = c;
		else {
			r[n++] = '%';
			r[n++] = hex[(c >> 4 ) & 0xF];
			r[n++] = hex[c & 0xF];
		}
	}
	r[n++] = 0;
	return r;
}

static char *_conv_hex(const unsigned char *p, size_t len)
{
	char *r;
	int i,n;
	const char *hex = "0123456789abcdef";
	r = malloc(len * 2 + 1);
	n = 0;
	for (i = 0; i < len; i++) {
		r[n++] = hex[(p[i] >> 4 ) & 0xF];
		r[n++] = hex[p[i] & 0xF];
	}
	r[n] = 0;

	return r;
}

static char *_gen_hex_sha256(const char *p, size_t len)
{
	unsigned char hash[SHA256_DIGEST_LENGTH];

	SHA256((unsigned char*)p, len, hash);
	return _conv_hex(hash, SHA256_DIGEST_LENGTH);
}

static char *_gen_hex_md5(const char *p, size_t len)
{
	unsigned char hash[MD5_DIGEST_LENGTH];

	MD5((unsigned char*)p, len, hash);
	return _conv_hex(hash, MD5_DIGEST_LENGTH);
}

static void _hmac(unsigned char *md, void *key, int key_len, char *data) {
#ifndef CONFIG_HAVE_OPAQUE_HMAC_CTX
	HMAC_CTX _ctx;
#endif
	HMAC_CTX *ctx;
	unsigned int hmac_len;

#ifdef CONFIG_HAVE_OPAQUE_HMAC_CTX
	ctx = HMAC_CTX_new();
#else
	ctx = &_ctx;
	/* work-around crash in certain versions of libssl */
	HMAC_CTX_init(ctx);
#endif
	HMAC_Init_ex(ctx, key, key_len, EVP_sha256(), NULL);
	HMAC_Update(ctx, (unsigned char*)data, strlen(data));
	HMAC_Final(ctx, md, &hmac_len);
#ifdef CONFIG_HAVE_OPAQUE_HMAC_CTX
	HMAC_CTX_free(ctx);
#else
	HMAC_CTX_cleanup(ctx);
#endif
}

static int _curl_trace(CURL *handle, curl_infotype type,
	     char *data, size_t size,
	     void *userp)
{
	const char *text;
	(void)handle; /* prevent compiler warning */
	(void)userp;

	switch (type) {
	case CURLINFO_TEXT:
		fprintf(stderr, "== Info: %s", data);
		/* fall through */
	default:
	case CURLINFO_SSL_DATA_OUT:
		/* fall through */
	case CURLINFO_SSL_DATA_IN:
		return 0;

	case CURLINFO_HEADER_OUT:
		text = "=> Send header";
		break;
	case CURLINFO_DATA_OUT:
		text = "=> Send data";
		break;
	case CURLINFO_HEADER_IN:
		text = "<= Recv header";
		break;
	case CURLINFO_DATA_IN:
		text = "<= Recv data";
		break;
	}

	log_info("%s: %s", text, data);
	return 0;
}

/* https://docs.aws.amazon.com/AmazonS3/latest/API/sig-v4-header-based-auth.html
 * https://docs.aws.amazon.com/AmazonS3/latest/API/sig-v4-authenticating-requests.html#signing-request-intro
 */
static void _add_aws_auth_header(CURL *curl, struct curl_slist *slist, struct http_options *o,
		int op, const char *uri, char *buf, size_t len)
{
	char date_short[16];
	char date_iso[32];
	char method[8];
	char dkey[128];
	char creq[512];
	char sts[256];
	char s[512];
	char *uri_encoded = NULL;
	char *dsha = NULL;
	char *csha = NULL;
	char *signature = NULL;
	const char *service = "s3";
	const char *aws = "aws4_request";
	unsigned char md[SHA256_DIGEST_LENGTH];

	time_t t = time(NULL);
	struct tm *gtm = gmtime(&t);

	strftime (date_short, sizeof(date_short), "%Y%m%d", gtm);
	strftime (date_iso, sizeof(date_iso), "%Y%m%dT%H%M%SZ", gtm);
	uri_encoded = _aws_uriencode(uri);

	if (op == DDIR_WRITE) {
		dsha = _gen_hex_sha256(buf, len);
		sprintf(method, "PUT");
	} else {
		/* DDIR_READ && DDIR_TRIM supply an empty body */
		if (op == DDIR_READ)
			sprintf(method, "GET");
		else
			sprintf(method, "DELETE");
		dsha = _gen_hex_sha256("", 0);
	}

	/* Create the canonical request first */
	snprintf(creq, sizeof(creq),
	"%s\n"
	"%s\n"
	"\n"
	"host:%s\n"
	"x-amz-content-sha256:%s\n"
	"x-amz-date:%s\n"
	"\n"
	"host;x-amz-content-sha256;x-amz-date\n"
	"%s"
	, method
	, uri_encoded, o->host, dsha, date_iso, dsha);

	csha = _gen_hex_sha256(creq, strlen(creq));
	snprintf(sts, sizeof(sts), "AWS4-HMAC-SHA256\n%s\n%s/%s/%s/%s\n%s",
		date_iso, date_short, o->s3_region, service, aws, csha);

	snprintf((char *)dkey, sizeof(dkey), "AWS4%s", o->s3_key);
	_hmac(md, dkey, strlen(dkey), date_short);
	_hmac(md, md, SHA256_DIGEST_LENGTH, o->s3_region);
	_hmac(md, md, SHA256_DIGEST_LENGTH, (char*) service);
	_hmac(md, md, SHA256_DIGEST_LENGTH, (char*) aws);
	_hmac(md, md, SHA256_DIGEST_LENGTH, sts);

	signature = _conv_hex(md, SHA256_DIGEST_LENGTH);

	/* Surpress automatic Accept: header */
	slist = curl_slist_append(slist, "Accept:");

	snprintf(s, sizeof(s), "x-amz-content-sha256: %s", dsha);
	slist = curl_slist_append(slist, s);

	snprintf(s, sizeof(s), "x-amz-date: %s", date_iso);
	slist = curl_slist_append(slist, s);

	snprintf(s, sizeof(s), "Authorization: AWS4-HMAC-SHA256 Credential=%s/%s/%s/s3/aws4_request,"
	"SignedHeaders=host;x-amz-content-sha256;x-amz-date,Signature=%s",
	o->s3_keyid, date_short, o->s3_region, signature);
	slist = curl_slist_append(slist, s);

	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);

	free(uri_encoded);
	free(csha);
	free(dsha);
	free(signature);
}

static void _add_swift_header(CURL *curl, struct curl_slist *slist, struct http_options *o,
		int op, const char *uri, char *buf, size_t len)
{
	char *dsha = NULL;
	char s[512];

	if (op == DDIR_WRITE) {
		dsha = _gen_hex_md5(buf, len);
	}
	/* Surpress automatic Accept: header */
	slist = curl_slist_append(slist, "Accept:");

	snprintf(s, sizeof(s), "etag: %s", dsha);
	slist = curl_slist_append(slist, s);

	snprintf(s, sizeof(s), "x-auth-token: %s", o->swift_auth_token);
	slist = curl_slist_append(slist, s);

	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);

	free(dsha);
}

static void fio_http_cleanup(struct thread_data *td)
{
	struct http_data *http = td->io_ops_data;

	if (http) {
		curl_easy_cleanup(http->curl);
		free(http);
	}
}

static size_t _http_read(void *ptr, size_t size, size_t nmemb, void *stream)
{
	struct http_curl_stream *state = stream;
	size_t len = size * nmemb;
	/* We're retrieving; nothing is supposed to be read locally */
	if (!stream)
		return 0;
	if (len+state->pos > state->max)
		len = state->max - state->pos;
	memcpy(ptr, &state->buf[state->pos], len);
	state->pos += len;
	return len;
}

static size_t _http_write(void *ptr, size_t size, size_t nmemb, void *stream)
{
	struct http_curl_stream *state = stream;
	/* We're just discarding the returned body after a PUT */
	if (!stream)
		return nmemb;
	if (size != 1)
		return CURLE_WRITE_ERROR;
	if (nmemb + state->pos > state->max)
		return CURLE_WRITE_ERROR;
	memcpy(&state->buf[state->pos], ptr, nmemb);
	state->pos += nmemb;
	return nmemb;
}

static int _http_seek(void *stream, curl_off_t offset, int origin)
{
	struct http_curl_stream *state = stream;
	if (offset < state->max && origin == SEEK_SET) {
		state->pos = offset;
		return CURL_SEEKFUNC_OK;
	} else
		return CURL_SEEKFUNC_FAIL;
}

static enum fio_q_status fio_http_queue(struct thread_data *td,
					 struct io_u *io_u)
{
	struct http_data *http = td->io_ops_data;
	struct http_options *o = td->eo;
	struct http_curl_stream _curl_stream;
	struct curl_slist *slist = NULL;
	char object[512];
	char url[1024];
	long status;
	CURLcode res;
	int r = -1;

	fio_ro_check(td, io_u);
	memset(&_curl_stream, 0, sizeof(_curl_stream));
	snprintf(object, sizeof(object), "%s_%llu_%llu", td->files[0]->file_name,
		io_u->offset, io_u->xfer_buflen);
	if (o->https == FIO_HTTPS_OFF)
		snprintf(url, sizeof(url), "http://%s%s", o->host, object);
	else
		snprintf(url, sizeof(url), "https://%s%s", o->host, object);
	curl_easy_setopt(http->curl, CURLOPT_URL, url);
	_curl_stream.buf = io_u->xfer_buf;
	_curl_stream.max = io_u->xfer_buflen;
	curl_easy_setopt(http->curl, CURLOPT_SEEKDATA, &_curl_stream);
	curl_easy_setopt(http->curl, CURLOPT_INFILESIZE_LARGE, (curl_off_t)io_u->xfer_buflen);

	if (o->mode == FIO_HTTP_S3)
		_add_aws_auth_header(http->curl, slist, o, io_u->ddir, object,
			io_u->xfer_buf, io_u->xfer_buflen);
	else if (o->mode == FIO_HTTP_SWIFT)
		_add_swift_header(http->curl, slist, o, io_u->ddir, object,
			io_u->xfer_buf, io_u->xfer_buflen);

	if (io_u->ddir == DDIR_WRITE) {
		curl_easy_setopt(http->curl, CURLOPT_READDATA, &_curl_stream);
		curl_easy_setopt(http->curl, CURLOPT_WRITEDATA, NULL);
		curl_easy_setopt(http->curl, CURLOPT_UPLOAD, 1L);
		res = curl_easy_perform(http->curl);
		if (res == CURLE_OK) {
			curl_easy_getinfo(http->curl, CURLINFO_RESPONSE_CODE, &status);
			if (status == 100 || (status >= 200 && status <= 204))
				goto out;
			log_err("DDIR_WRITE failed with HTTP status code %ld\n", status);
			goto err;
		}
	} else if (io_u->ddir == DDIR_READ) {
		curl_easy_setopt(http->curl, CURLOPT_READDATA, NULL);
		curl_easy_setopt(http->curl, CURLOPT_WRITEDATA, &_curl_stream);
		curl_easy_setopt(http->curl, CURLOPT_HTTPGET, 1L);
		res = curl_easy_perform(http->curl);
		if (res == CURLE_OK) {
			curl_easy_getinfo(http->curl, CURLINFO_RESPONSE_CODE, &status);
			if (status == 200)
				goto out;
			else if (status == 404) {
				/* Object doesn't exist. Pretend we read
				 * zeroes */
				memset(io_u->xfer_buf, 0, io_u->xfer_buflen);
				goto out;
			}
			log_err("DDIR_READ failed with HTTP status code %ld\n", status);
		}
		goto err;
	} else if (io_u->ddir == DDIR_TRIM) {
		curl_easy_setopt(http->curl, CURLOPT_HTTPGET, 1L);
		curl_easy_setopt(http->curl, CURLOPT_CUSTOMREQUEST, "DELETE");
		curl_easy_setopt(http->curl, CURLOPT_INFILESIZE_LARGE, (curl_off_t)0);
		curl_easy_setopt(http->curl, CURLOPT_READDATA, NULL);
		curl_easy_setopt(http->curl, CURLOPT_WRITEDATA, NULL);
		res = curl_easy_perform(http->curl);
		if (res == CURLE_OK) {
			curl_easy_getinfo(http->curl, CURLINFO_RESPONSE_CODE, &status);
			if (status == 200 || status == 202 || status == 204 || status == 404)
				goto out;
			log_err("DDIR_TRIM failed with HTTP status code %ld\n", status);
		}
		goto err;
	}

	log_err("WARNING: Only DDIR_READ/DDIR_WRITE/DDIR_TRIM are supported!\n");

err:
	io_u->error = r;
	td_verror(td, io_u->error, "transfer");
out:
	curl_slist_free_all(slist);
	return FIO_Q_COMPLETED;
}

static struct io_u *fio_http_event(struct thread_data *td, int event)
{
	/* sync IO engine - never any outstanding events */
	return NULL;
}

int fio_http_getevents(struct thread_data *td, unsigned int min,
	unsigned int max, const struct timespec *t)
{
	/* sync IO engine - never any outstanding events */
	return 0;
}

static int fio_http_setup(struct thread_data *td)
{
	struct http_data *http = NULL;
	struct http_options *o = td->eo;

	/* allocate engine specific structure to deal with libhttp. */
	http = calloc(1, sizeof(*http));
	if (!http) {
		log_err("calloc failed.\n");
		goto cleanup;
	}

	http->curl = curl_easy_init();
	if (o->verbose)
		curl_easy_setopt(http->curl, CURLOPT_VERBOSE, 1L);
	if (o->verbose > 1)
		curl_easy_setopt(http->curl, CURLOPT_DEBUGFUNCTION, &_curl_trace);
	curl_easy_setopt(http->curl, CURLOPT_NOPROGRESS, 1L);
	curl_easy_setopt(http->curl, CURLOPT_FOLLOWLOCATION, 1L);
	curl_easy_setopt(http->curl, CURLOPT_PROTOCOLS, CURLPROTO_HTTP|CURLPROTO_HTTPS);
	if (o->https == FIO_HTTPS_INSECURE) {
		curl_easy_setopt(http->curl, CURLOPT_SSL_VERIFYPEER, 0L);
		curl_easy_setopt(http->curl, CURLOPT_SSL_VERIFYHOST, 0L);
	}
	curl_easy_setopt(http->curl, CURLOPT_READFUNCTION, _http_read);
	curl_easy_setopt(http->curl, CURLOPT_WRITEFUNCTION, _http_write);
	curl_easy_setopt(http->curl, CURLOPT_SEEKFUNCTION, &_http_seek);
	if (o->user && o->pass) {
		curl_easy_setopt(http->curl, CURLOPT_USERNAME, o->user);
		curl_easy_setopt(http->curl, CURLOPT_PASSWORD, o->pass);
		curl_easy_setopt(http->curl, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
	}

	td->io_ops_data = http;

	/* Force single process mode. */
	td->o.use_thread = 1;

	return 0;
cleanup:
	fio_http_cleanup(td);
	return 1;
}

static int fio_http_open(struct thread_data *td, struct fio_file *f)
{
	return 0;
}
static int fio_http_invalidate(struct thread_data *td, struct fio_file *f)
{
	return 0;
}

static struct ioengine_ops ioengine = {
	.name = "http",
	.version		= FIO_IOOPS_VERSION,
	.flags			= FIO_DISKLESSIO,
	.setup			= fio_http_setup,
	.queue			= fio_http_queue,
	.getevents		= fio_http_getevents,
	.event			= fio_http_event,
	.cleanup		= fio_http_cleanup,
	.open_file		= fio_http_open,
	.invalidate		= fio_http_invalidate,
	.options		= options,
	.option_struct_size	= sizeof(struct http_options),
};

static void fio_init fio_http_register(void)
{
	register_ioengine(&ioengine);
}

static void fio_exit fio_http_unregister(void)
{
	unregister_ioengine(&ioengine);
}
Commit	Line	Data
c2f6a13d LMB	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>
09fd2966	28	#include <openssl/md5.h>
c2f6a13d LMB	29	#include "fio.h"
	30	#include "../optgroup.h"
	31
	32
09fd2966 LMB	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
c2f6a13d LMB	43	struct http_data {
	44	CURL *curl;
	45	};
	46
	47	struct http_options {
	48	void *pad;
09fd2966	49	unsigned int https;
c2f6a13d LMB	50	char *host;
	51	char *user;
	52	char *pass;
	53	char *s3_key;
	54	char *s3_keyid;
	55	char *s3_region;
09fd2966	56	char *swift_auth_token;
c2f6a13d	57	int verbose;
09fd2966	58	unsigned int mode;
c2f6a13d LMB	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",
09fd2966	71	.type = FIO_OPT_STR,
c2f6a13d LMB	72	.help = "Enable https",
c2f6a13d LMB	73	.off1 = offsetof(struct http_options, https),
09fd2966 LMB	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	},
c2f6a13d LMB	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	},
09fd2966 LMB	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	},
c2f6a13d LMB	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	{
09fd2966 LMB	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	},
c2f6a13d LMB	181	.category = FIO_OPT_C_ENGINE,
	182	.group = FIO_OPT_G_HTTP,
	183	},
	184	{
	185	.name = "http_verbose",
09fd2966	186	.lname = "HTTP verbosity level",
c2f6a13d LMB	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
09fd2966 LMB	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
c2f6a13d	265	static void _hmac(unsigned char md, void key, int key_len, char *data) {
b61a5f46 DD	266	#ifndef CONFIG_HAVE_OPAQUE_HMAC_CTX
	267	HMAC_CTX _ctx;
	268	#endif
c2f6a13d LMB	269	HMAC_CTX *ctx;
	270	unsigned int hmac_len;
	271
b61a5f46	272	#ifdef CONFIG_HAVE_OPAQUE_HMAC_CTX
c2f6a13d	273	ctx = HMAC_CTX_new();
b61a5f46 DD	274	#else
b61a5f46 DD	275	ctx = &_ctx;
e8aaa776 JA	276	/* work-around crash in certain versions of libssl */
e8aaa776 JA	277	HMAC_CTX_init(ctx);
b61a5f46	278	#endif
c2f6a13d LMB	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);
b61a5f46	282	#ifdef CONFIG_HAVE_OPAQUE_HMAC_CTX
c2f6a13d	283	HMAC_CTX_free(ctx);
b61a5f46 DD	284	#else
	285	HMAC_CTX_cleanup(ctx);
	286	#endif
c2f6a13d LMB	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:
24010223 JA	299	fprintf(stderr, "== Info: %s", data);
24010223 JA	300	/* fall through */
c2f6a13d LMB	301	default:
c2f6a13d LMB	302	case CURLINFO_SSL_DATA_OUT:
24010223	303	/* fall through */
c2f6a13d LMB	304	case CURLINFO_SSL_DATA_IN:
	305	return 0;
	306
	307	case CURLINFO_HEADER_OUT:
	308	text = "=> Send header";
	309	break;
	310	case CURLINFO_DATA_OUT:
	311	text = "=> Send data";
	312	break;
	313	case CURLINFO_HEADER_IN:
	314	text = "<= Recv header";
	315	break;
	316	case CURLINFO_DATA_IN:
	317	text = "<= Recv data";
	318	break;
	319	}
	320
	321	log_info("%s: %s", text, data);
	322	return 0;
	323	}
	324
	325	/* https://docs.aws.amazon.com/AmazonS3/latest/API/sig-v4-header-based-auth.html
	326	* https://docs.aws.amazon.com/AmazonS3/latest/API/sig-v4-authenticating-requests.html#signing-request-intro
	327	*/
	328	static void _add_aws_auth_header(CURL curl, struct curl_slist slist, struct http_options *o,
	329	int op, const char uri, char buf, size_t len)
	330	{
	331	char date_short[16];
	332	char date_iso[32];
	333	char method[8];
	334	char dkey[128];
	335	char creq[512];
	336	char sts[256];
	337	char s[512];
	338	char *uri_encoded = NULL;
	339	char *dsha = NULL;
	340	char *csha = NULL;
	341	char *signature = NULL;
	342	const char *service = "s3";
	343	const char *aws = "aws4_request";
	344	unsigned char md[SHA256_DIGEST_LENGTH];
	345
	346	time_t t = time(NULL);
	347	struct tm *gtm = gmtime(&t);
	348
	349	strftime (date_short, sizeof(date_short), "%Y%m%d", gtm);
	350	strftime (date_iso, sizeof(date_iso), "%Y%m%dT%H%M%SZ", gtm);
	351	uri_encoded = _aws_uriencode(uri);
	352
	353	if (op == DDIR_WRITE) {
	354	dsha = _gen_hex_sha256(buf, len);
	355	sprintf(method, "PUT");
	356	} else {
	357	/* DDIR_READ && DDIR_TRIM supply an empty body */
	358	if (op == DDIR_READ)
	359	sprintf(method, "GET");
	360	else
	361	sprintf(method, "DELETE");
	362	dsha = _gen_hex_sha256("", 0);
	363	}
	364
	365	/* Create the canonical request first */
	366	snprintf(creq, sizeof(creq),
	367	"%s\n"
368	"%s\n"
369	"\n"
370	"host:%s\n"
371	"x-amz-content-sha256:%s\n"
372	"x-amz-date:%s\n"
373	"\n"
374	"host;x-amz-content-sha256;x-amz-date\n"
375	"%s"
376	, method
377	, uri_encoded, o->host, dsha, date_iso, dsha);
378
379	csha = _gen_hex_sha256(creq, strlen(creq));
380	snprintf(sts, sizeof(sts), "AWS4-HMAC-SHA256\n%s\n%s/%s/%s/%s\n%s",
381	date_iso, date_short, o->s3_region, service, aws, csha);
382
383	snprintf((char *)dkey, sizeof(dkey), "AWS4%s", o->s3_key);
384	_hmac(md, dkey, strlen(dkey), date_short);
385	_hmac(md, md, SHA256_DIGEST_LENGTH, o->s3_region);
386	_hmac(md, md, SHA256_DIGEST_LENGTH, (char*) service);
387	_hmac(md, md, SHA256_DIGEST_LENGTH, (char*) aws);
388	_hmac(md, md, SHA256_DIGEST_LENGTH, sts);
389
390	signature = _conv_hex(md, SHA256_DIGEST_LENGTH);
391
392	/* Surpress automatic Accept: header */
393	slist = curl_slist_append(slist, "Accept:");
394
395	snprintf(s, sizeof(s), "x-amz-content-sha256: %s", dsha);
396	slist = curl_slist_append(slist, s);
397
398	snprintf(s, sizeof(s), "x-amz-date: %s", date_iso);
399	slist = curl_slist_append(slist, s);
400
401	snprintf(s, sizeof(s), "Authorization: AWS4-HMAC-SHA256 Credential=%s/%s/%s/s3/aws4_request,"
402	"SignedHeaders=host;x-amz-content-sha256;x-amz-date,Signature=%s",
403	o->s3_keyid, date_short, o->s3_region, signature);
404	slist = curl_slist_append(slist, s);
405
406	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
407
408	free(uri_encoded);
409	free(csha);
410	free(dsha);
411	free(signature);
412	}
413
09fd2966 LMB	414	static void _add_swift_header(CURL curl, struct curl_slist slist, struct http_options *o,
	415	int op, const char uri, char buf, size_t len)
	416	{
	417	char *dsha = NULL;
	418	char s[512];
	419
	420	if (op == DDIR_WRITE) {
	421	dsha = _gen_hex_md5(buf, len);
	422	}
	423	/* Surpress automatic Accept: header */
	424	slist = curl_slist_append(slist, "Accept:");
	425
	426	snprintf(s, sizeof(s), "etag: %s", dsha);
	427	slist = curl_slist_append(slist, s);
	428
	429	snprintf(s, sizeof(s), "x-auth-token: %s", o->swift_auth_token);
	430	slist = curl_slist_append(slist, s);
	431
	432	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
	433
	434	free(dsha);
	435	}
	436
c2f6a13d LMB	437	static void fio_http_cleanup(struct thread_data *td)
	438	{
	439	struct http_data *http = td->io_ops_data;
	440
	441	if (http) {
	442	curl_easy_cleanup(http->curl);
	443	free(http);
	444	}
	445	}
	446
	447	static size_t _http_read(void ptr, size_t size, size_t nmemb, void stream)
	448	{
	449	struct http_curl_stream *state = stream;
	450	size_t len = size * nmemb;
	451	/* We're retrieving; nothing is supposed to be read locally */
	452	if (!stream)
	453	return 0;
	454	if (len+state->pos > state->max)
	455	len = state->max - state->pos;
	456	memcpy(ptr, &state->buf[state->pos], len);
	457	state->pos += len;
	458	return len;
	459	}
	460
	461	static size_t _http_write(void ptr, size_t size, size_t nmemb, void stream)
	462	{
	463	struct http_curl_stream *state = stream;
	464	/* We're just discarding the returned body after a PUT */
	465	if (!stream)
	466	return nmemb;
	467	if (size != 1)
	468	return CURLE_WRITE_ERROR;
	469	if (nmemb + state->pos > state->max)
	470	return CURLE_WRITE_ERROR;
	471	memcpy(&state->buf[state->pos], ptr, nmemb);
	472	state->pos += nmemb;
	473	return nmemb;
	474	}
	475
	476	static int _http_seek(void *stream, curl_off_t offset, int origin)
	477	{
	478	struct http_curl_stream *state = stream;
	479	if (offset < state->max && origin == SEEK_SET) {
	480	state->pos = offset;
	481	return CURL_SEEKFUNC_OK;
	482	} else
	483	return CURL_SEEKFUNC_FAIL;
	484	}
	485
	486	static enum fio_q_status fio_http_queue(struct thread_data *td,
	487	struct io_u *io_u)
	488	{
	489	struct http_data *http = td->io_ops_data;
	490	struct http_options *o = td->eo;
	491	struct http_curl_stream _curl_stream;
	492	struct curl_slist *slist = NULL;
	493	char object[512];
	494	char url[1024];
	495	long status;
	496	CURLcode res;
	497	int r = -1;
	498
	499	fio_ro_check(td, io_u);
	500	memset(&_curl_stream, 0, sizeof(_curl_stream));
09fd2966 LMB	501	snprintf(object, sizeof(object), "%s_%llu_%llu", td->files[0]->file_name,
	502	io_u->offset, io_u->xfer_buflen);
	503	if (o->https == FIO_HTTPS_OFF)
	504	snprintf(url, sizeof(url), "http://%s%s", o->host, object);
	505	else
	506	snprintf(url, sizeof(url), "https://%s%s", o->host, object);
c2f6a13d LMB	507	curl_easy_setopt(http->curl, CURLOPT_URL, url);
	508	_curl_stream.buf = io_u->xfer_buf;
	509	_curl_stream.max = io_u->xfer_buflen;
	510	curl_easy_setopt(http->curl, CURLOPT_SEEKDATA, &_curl_stream);
	511	curl_easy_setopt(http->curl, CURLOPT_INFILESIZE_LARGE, (curl_off_t)io_u->xfer_buflen);
	512
09fd2966	513	if (o->mode == FIO_HTTP_S3)
c2f6a13d LMB	514	_add_aws_auth_header(http->curl, slist, o, io_u->ddir, object,
c2f6a13d LMB	515	io_u->xfer_buf, io_u->xfer_buflen);
09fd2966 LMB	516	else if (o->mode == FIO_HTTP_SWIFT)
	517	_add_swift_header(http->curl, slist, o, io_u->ddir, object,
	518	io_u->xfer_buf, io_u->xfer_buflen);
c2f6a13d LMB	519
	520	if (io_u->ddir == DDIR_WRITE) {
	521	curl_easy_setopt(http->curl, CURLOPT_READDATA, &_curl_stream);
	522	curl_easy_setopt(http->curl, CURLOPT_WRITEDATA, NULL);
	523	curl_easy_setopt(http->curl, CURLOPT_UPLOAD, 1L);
	524	res = curl_easy_perform(http->curl);
	525	if (res == CURLE_OK) {
	526	curl_easy_getinfo(http->curl, CURLINFO_RESPONSE_CODE, &status);
	527	if (status == 100 \|\| (status >= 200 && status <= 204))
	528	goto out;
	529	log_err("DDIR_WRITE failed with HTTP status code %ld\n", status);
	530	goto err;
	531	}
	532	} else if (io_u->ddir == DDIR_READ) {
	533	curl_easy_setopt(http->curl, CURLOPT_READDATA, NULL);
	534	curl_easy_setopt(http->curl, CURLOPT_WRITEDATA, &_curl_stream);
	535	curl_easy_setopt(http->curl, CURLOPT_HTTPGET, 1L);
	536	res = curl_easy_perform(http->curl);
	537	if (res == CURLE_OK) {
	538	curl_easy_getinfo(http->curl, CURLINFO_RESPONSE_CODE, &status);
	539	if (status == 200)
	540	goto out;
	541	else if (status == 404) {
	542	/* Object doesn't exist. Pretend we read
	543	* zeroes */
	544	memset(io_u->xfer_buf, 0, io_u->xfer_buflen);
	545	goto out;
	546	}
	547	log_err("DDIR_READ failed with HTTP status code %ld\n", status);
	548	}
	549	goto err;
	550	} else if (io_u->ddir == DDIR_TRIM) {
	551	curl_easy_setopt(http->curl, CURLOPT_HTTPGET, 1L);
	552	curl_easy_setopt(http->curl, CURLOPT_CUSTOMREQUEST, "DELETE");
bd915a6b	553	curl_easy_setopt(http->curl, CURLOPT_INFILESIZE_LARGE, (curl_off_t)0);
c2f6a13d LMB	554	curl_easy_setopt(http->curl, CURLOPT_READDATA, NULL);
	555	curl_easy_setopt(http->curl, CURLOPT_WRITEDATA, NULL);
	556	res = curl_easy_perform(http->curl);
	557	if (res == CURLE_OK) {
	558	curl_easy_getinfo(http->curl, CURLINFO_RESPONSE_CODE, &status);
	559	if (status == 200 \|\| status == 202 \|\| status == 204 \|\| status == 404)
	560	goto out;
	561	log_err("DDIR_TRIM failed with HTTP status code %ld\n", status);
	562	}
	563	goto err;
	564	}
	565
	566	log_err("WARNING: Only DDIR_READ/DDIR_WRITE/DDIR_TRIM are supported!\n");
	567
	568	err:
	569	io_u->error = r;
	570	td_verror(td, io_u->error, "transfer");
	571	out:
	572	curl_slist_free_all(slist);
	573	return FIO_Q_COMPLETED;
	574	}
	575
	576	static struct io_u fio_http_event(struct thread_data td, int event)
	577	{
	578	/* sync IO engine - never any outstanding events */
	579	return NULL;
	580	}
	581
	582	int fio_http_getevents(struct thread_data *td, unsigned int min,
	583	unsigned int max, const struct timespec *t)
	584	{
	585	/* sync IO engine - never any outstanding events */
	586	return 0;
	587	}
	588
	589	static int fio_http_setup(struct thread_data *td)
	590	{
	591	struct http_data *http = NULL;
	592	struct http_options *o = td->eo;
c65f3435	593
c2f6a13d LMB	594	/* allocate engine specific structure to deal with libhttp. */
	595	http = calloc(1, sizeof(*http));
	596	if (!http) {
	597	log_err("calloc failed.\n");
	598	goto cleanup;
	599	}
	600
	601	http->curl = curl_easy_init();
	602	if (o->verbose)
	603	curl_easy_setopt(http->curl, CURLOPT_VERBOSE, 1L);
	604	if (o->verbose > 1)
	605	curl_easy_setopt(http->curl, CURLOPT_DEBUGFUNCTION, &_curl_trace);
	606	curl_easy_setopt(http->curl, CURLOPT_NOPROGRESS, 1L);
	607	curl_easy_setopt(http->curl, CURLOPT_FOLLOWLOCATION, 1L);
	608	curl_easy_setopt(http->curl, CURLOPT_PROTOCOLS, CURLPROTO_HTTP\|CURLPROTO_HTTPS);
09fd2966 LMB	609	if (o->https == FIO_HTTPS_INSECURE) {
	610	curl_easy_setopt(http->curl, CURLOPT_SSL_VERIFYPEER, 0L);
	611	curl_easy_setopt(http->curl, CURLOPT_SSL_VERIFYHOST, 0L);
	612	}
c2f6a13d LMB	613	curl_easy_setopt(http->curl, CURLOPT_READFUNCTION, _http_read);
c2f6a13d LMB	614	curl_easy_setopt(http->curl, CURLOPT_WRITEFUNCTION, _http_write);
bd915a6b	615	curl_easy_setopt(http->curl, CURLOPT_SEEKFUNCTION, &_http_seek);
c2f6a13d LMB	616	if (o->user && o->pass) {
	617	curl_easy_setopt(http->curl, CURLOPT_USERNAME, o->user);
	618	curl_easy_setopt(http->curl, CURLOPT_PASSWORD, o->pass);
	619	curl_easy_setopt(http->curl, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
	620	}
	621
	622	td->io_ops_data = http;
	623
	624	/* Force single process mode. */
	625	td->o.use_thread = 1;
	626
	627	return 0;
	628	cleanup:
	629	fio_http_cleanup(td);
c65f3435	630	return 1;
c2f6a13d LMB	631	}
	632
	633	static int fio_http_open(struct thread_data td, struct fio_file f)
	634	{
	635	return 0;
	636	}
	637	static int fio_http_invalidate(struct thread_data td, struct fio_file f)
	638	{
	639	return 0;
	640	}
	641
	642	static struct ioengine_ops ioengine = {
	643	.name = "http",
	644	.version = FIO_IOOPS_VERSION,
	645	.flags = FIO_DISKLESSIO,
	646	.setup = fio_http_setup,
	647	.queue = fio_http_queue,
	648	.getevents = fio_http_getevents,
	649	.event = fio_http_event,
	650	.cleanup = fio_http_cleanup,
	651	.open_file = fio_http_open,
	652	.invalidate = fio_http_invalidate,
	653	.options = options,
	654	.option_struct_size = sizeof(struct http_options),
	655	};
	656
	657	static void fio_init fio_http_register(void)
	658	{
	659	register_ioengine(&ioengine);
	660	}
	661
	662	static void fio_exit fio_http_unregister(void)
	663	{
	664	unregister_ioengine(&ioengine);
	665	}