cloudsync: Adding s3 plugin for cloudsync

This is a plugin which provides an interface to retrive files from amazon-s3
which are archived in to s3.

Users need to give the above information for cloudsync to retrieve the file
from s3.

TODO:
1- A separate commit in to developer-guide will detail about the usage
of this plugin in more detail.
2- Need to create target file in aws-bucket with "gfid" names. Helps avoiding
name collisions.

Change-Id: I2e4a586f4e3f86164de9178e37673a07f317e7d9
Updates: #387
Signed-off-by: Susant Palai <spalai@redhat.com>

7 files changed, 648 insertions, 0 deletions

diff --git a/xlators/features/cloudsync/src/cloudsync-plugins/src/Makefile.am b/xlators/features/cloudsync/src/cloudsync-plugins/src/Makefile.am
new file mode 100644
index 00000000000..4deefb651eb
--- /dev/null
+++ b/xlators/features/cloudsync/src/cloudsync-plugins/src/Makefile.am
@@ -0,0 +1,7 @@
+if BUILD_AMAZONS3_PLUGIN
+  AMAZONS3_DIR = cloudsyncs3
+endif
+
+SUBDIRS = ${AMAZONS3_DIR}
+
+CLEANFILES =
diff --git a/xlators/features/cloudsync/src/cloudsync-plugins/src/cloudsyncs3/Makefile.am b/xlators/features/cloudsync/src/cloudsync-plugins/src/cloudsyncs3/Makefile.am
new file mode 100644
index 00000000000..a985f42a877
--- /dev/null
+++ b/xlators/features/cloudsync/src/cloudsync-plugins/src/cloudsyncs3/Makefile.am
@@ -0,0 +1,3 @@
+SUBDIRS = src
+
+CLEANFILES =
diff --git a/xlators/features/cloudsync/src/cloudsync-plugins/src/cloudsyncs3/src/Makefile.am b/xlators/features/cloudsync/src/cloudsync-plugins/src/cloudsyncs3/src/Makefile.am
new file mode 100644
index 00000000000..93fb2eecbf5
--- /dev/null
+++ b/xlators/features/cloudsync/src/cloudsync-plugins/src/cloudsyncs3/src/Makefile.am
@@ -0,0 +1,12 @@
+csp_LTLIBRARIES = cloudsyncs3.la
+cspdir = $(libdir)/glusterfs/$(PACKAGE_VERSION)/cloudsync-plugins
+
+cloudsyncs3_la_SOURCES = libcloudsyncs3.c  $(top_srcdir)/xlators/features/cloudsync/src/cloudsync-common.c
+cloudsyncs3_la_LIBADD = $(top_builddir)/libglusterfs/src/libglusterfs.la
+cloudsyncs3_la_LDFLAGS = -module -avoid-version -export-symbols $(top_srcdir)/xlators/features/cloudsync/src/cloudsync-plugins/src/cloudsyncs3/src/libcloudsyncs3.sym
+AM_CPPFLAGS = $(GF_CPPFLAGS) -I$(top_srcdir)/libglusterfs/src   -I$(top_srcdir)/rpc/xdr/src -I$(top_builddir)/rpc/xdr/src -lcurlpp -lcryptopp
+noinst_HEADERS = libcloudsyncs3.h libcloudsyncs3-mem-types.h
+AM_CFLAGS = -Wall -fno-strict-aliasing $(GF_CFLAGS) -lcurl -lcrypto -I$(top_srcdir)/xlators/features/cloudsync/src
+CLEANFILES =
+
+EXTRA_DIST = libcloudsyncs3.sym
diff --git a/xlators/features/cloudsync/src/cloudsync-plugins/src/cloudsyncs3/src/libcloudsyncs3-mem-types.h b/xlators/features/cloudsync/src/cloudsync-plugins/src/cloudsyncs3/src/libcloudsyncs3-mem-types.h
new file mode 100644
index 00000000000..dd9314ec8d8
--- /dev/null
+++ b/xlators/features/cloudsync/src/cloudsync-plugins/src/cloudsyncs3/src/libcloudsyncs3-mem-types.h
@@ -0,0 +1,21 @@
+/*
+ *   Copyright (c) 2018 Red Hat, Inc. <http://www.redhat.com>
+ *   This file is part of GlusterFS.
+ *
+ *   This file is licensed to you under your choice of the GNU Lesser
+ *   General Public License, version 3 or any later version (LGPLv3 or
+ *   later), or the GNU General Public License, version 2 (GPLv2), in all
+ *   cases as published by the Free Software Foundation.
+ */
+
+
+#ifndef __LIBAWS_MEM_TYPES_H__
+#define __LIBAWS_MEM_TYPES_H__
+
+#include "mem-types.h"
+enum libaws_mem_types_ {
+        gf_libaws_mt_aws_private_t = gf_common_mt_end + 1,
+        gf_libaws_mt_end
+};
+#endif /* __CLOUDSYNC_MEM_TYPES_H__ */
+
diff --git a/xlators/features/cloudsync/src/cloudsync-plugins/src/cloudsyncs3/src/libcloudsyncs3.c b/xlators/features/cloudsync/src/cloudsync-plugins/src/cloudsyncs3/src/libcloudsyncs3.c
new file mode 100644
index 00000000000..019f98017dc
--- /dev/null
+++ b/xlators/features/cloudsync/src/cloudsync-plugins/src/cloudsyncs3/src/libcloudsyncs3.c
@@ -0,0 +1,553 @@
+/*
+  Copyright (c) 2018 Red Hat, Inc. <http://www.redhat.com>
+  This file is part of GlusterFS.
+
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
+*/
+
+#include <stdlib.h>
+#include <openssl/hmac.h>
+#include <openssl/evp.h>
+#include <openssl/bio.h>
+#include <openssl/buffer.h>
+#include <openssl/crypto.h>
+#include <curl/curl.h>
+#include "xlator.h"
+#include "glusterfs.h"
+#include "libcloudsyncs3.h"
+#include "cloudsync-common.h"
+
+#define RESOURCE_SIZE 4096
+
+store_methods_t store_ops = {
+        .fop_download = aws_download_s3,
+        .fop_init     = aws_init,
+        .fop_reconfigure = aws_reconfigure,
+        .fop_fini     = aws_fini,
+};
+
+typedef struct aws_private {
+        char *hostname;
+        char *bucketid;
+        char *awssekey;
+        char *awskeyid;
+        gf_boolean_t abortdl;
+        pthread_spinlock_t lock;
+} aws_private_t;
+
+void *
+aws_init (xlator_t *this)
+{
+        aws_private_t  *priv = NULL;
+        char           *temp_str = NULL;
+        int             ret = 0;
+
+        priv = GF_CALLOC (1, sizeof (aws_private_t),
+                          gf_libaws_mt_aws_private_t);
+        if (!priv) {
+                gf_msg (this->name, GF_LOG_ERROR, 0, 0, "insufficient memory");
+                ret = -1;
+                goto out;
+        }
+
+        priv->abortdl = _gf_false;
+
+        pthread_spin_init (&priv->lock, PTHREAD_PROCESS_PRIVATE);
+
+        pthread_spin_lock (&(priv->lock));
+        {
+        if (dict_get_str (this->options, "s3plugin-seckey",
+            &temp_str) == 0) {
+                priv->awssekey = gf_strdup (temp_str);
+                if (!priv->awssekey) {
+                        gf_msg (this->name, GF_LOG_ERROR, ENOMEM, 0,
+                                "initializing aws secret key failed");
+                        ret = -1;
+                        goto unlock;
+                }
+        }
+
+        if (dict_get_str (this->options, "s3plugin-keyid",
+            &temp_str) == 0) {
+                priv->awskeyid = gf_strdup (temp_str);
+                if (!priv->awskeyid) {
+                        gf_msg (this->name, GF_LOG_ERROR, ENOMEM, 0,
+                                "initializing aws key ID failed");
+                        ret = -1;
+                        goto unlock;
+                }
+        }
+
+        if (dict_get_str (this->options, "s3plugin-bucketid",
+            &temp_str) == 0) {
+                priv->bucketid = gf_strdup (temp_str);
+                if (!priv->bucketid) {
+                        gf_msg (this->name, GF_LOG_ERROR, ENOMEM, 0,
+                                "initializing aws bucketid failed");
+
+                        ret = -1;
+                        goto unlock;
+                }
+        }
+
+        if (dict_get_str (this->options, "s3plugin-hostname",
+            &temp_str) == 0) {
+                priv->hostname = gf_strdup (temp_str);
+                if (!priv->hostname) {
+                        gf_msg (this->name, GF_LOG_ERROR, ENOMEM, 0,
+                                "initializing aws hostname failed");
+
+                        ret = -1;
+                        goto unlock;
+                }
+        }
+
+        gf_msg_debug (this->name,  0, "stored key: %s id: %s "
+                      "bucketid %s hostname: %s", priv->awssekey,
+                      priv->awskeyid, priv->bucketid, priv->hostname);
+
+        }
+unlock:
+        pthread_spin_unlock (&(priv->lock));
+
+out:
+        if (ret  == -1) {
+                GF_FREE (priv->awskeyid);
+                GF_FREE (priv->awssekey);
+                GF_FREE (priv->bucketid);
+                GF_FREE (priv->hostname);
+                GF_FREE (priv);
+                priv = NULL;
+        }
+
+        return (void *)priv;
+}
+
+int
+aws_reconfigure (xlator_t *this, dict_t *options)
+{
+        aws_private_t  *priv = NULL;
+        char           *temp_str = NULL;
+        int             ret = 0;
+        cs_private_t   *cspriv = NULL;
+
+        cspriv = this->private;
+
+        priv = cspriv->stores->config;
+
+        if (!priv) {
+                gf_msg (this->name, GF_LOG_ERROR, 0, 0, "null priv");
+                ret = -1;
+                goto out;
+        }
+
+        pthread_spin_lock (&(priv->lock));
+        {
+        if (dict_get_str (options, "s3plugin-seckey",
+            &temp_str) == 0) {
+                priv->awssekey = gf_strdup (temp_str);
+                if (!priv->awssekey) {
+                        gf_msg (this->name, GF_LOG_ERROR, ENOMEM, 0,
+                                "initializing aws secret key failed");
+                        ret = -1;
+                        goto out;
+                }
+        }
+
+        if (dict_get_str (options, "s3plugin-keyid",
+            &temp_str) == 0) {
+                priv->awskeyid = gf_strdup (temp_str);
+                if (!priv->awskeyid) {
+                        gf_msg (this->name, GF_LOG_ERROR, ENOMEM, 0,
+                                "initializing aws key ID failed");
+                        ret = -1;
+                        goto out;
+                }
+        }
+
+        if (dict_get_str (options, "s3plugin-bucketid",
+            &temp_str) == 0) {
+                priv->bucketid = gf_strdup (temp_str);
+                if (!priv->bucketid) {
+                        gf_msg (this->name, GF_LOG_ERROR, ENOMEM, 0,
+                                "initializing aws bucketid failed");
+                        ret = -1;
+                        goto out;
+                }
+        }
+
+        if (dict_get_str (options, "s3plugin-hostname",
+            &temp_str) == 0) {
+                priv->hostname = gf_strdup (temp_str);
+                if (!priv->hostname) {
+                        gf_msg (this->name, GF_LOG_ERROR, ENOMEM, 0,
+                                "initializing aws hostname failed");
+                        ret = -1;
+                        goto out;
+                }
+        }
+
+        }
+out:
+        pthread_spin_unlock (&(priv->lock));
+
+        gf_msg_debug (this->name,  0, "stored key: %s id: %s "
+                      "bucketid %s hostname: %s", priv->awssekey,
+                      priv->awskeyid, priv->bucketid, priv->hostname);
+
+        return ret;
+}
+
+void
+aws_fini (void *config)
+{
+        aws_private_t *priv = NULL;
+
+        priv = (aws_private_t *)priv;
+
+        if (priv) {
+                GF_FREE (priv->hostname);
+                GF_FREE (priv->bucketid);
+                GF_FREE (priv->awssekey);
+                GF_FREE (priv->awskeyid);
+
+                pthread_spin_destroy (&priv->lock);
+                GF_FREE (priv);
+        }
+}
+
+int32_t
+mem_acct_init (xlator_t *this)
+{
+        int     ret = -1;
+
+        GF_VALIDATE_OR_GOTO ("dht", this, out);
+
+        ret = xlator_mem_acct_init (this, gf_libaws_mt_end + 1);
+
+        if (ret != 0) {
+                gf_msg (this->name, GF_LOG_ERROR, 0, 0,
+                        "Memory accounting init failed");
+                return ret;
+        }
+out:
+        return ret;
+}
+char *
+aws_form_request (char *resource, char **date, char *reqtype, char *bucketid,
+                  char *filepath)
+{
+        char            httpdate[256];
+        time_t          ctime;
+        struct tm      *gtime = NULL;
+        char           *sign_req = NULL;
+
+        ctime = time(NULL);
+        gtime = gmtime(&ctime);
+
+        memset (httpdate, 0, sizeof(httpdate));
+        strftime (httpdate, sizeof(httpdate), "%a, %d %b %Y %H:%M:%S +0000",
+                  gtime);
+        *date = gf_strdup (httpdate);
+
+        memset (resource, 0, RESOURCE_SIZE);
+
+        snprintf(resource, RESOURCE_SIZE, "%s/%s", bucketid, filepath);
+
+        gf_msg_debug ("CS", 0, "resource %s", resource);
+
+        sign_req = GF_CALLOC (1, 256, gf_common_mt_char);
+
+        snprintf(sign_req, 256, "%s\n\n%s\n%s\n/%s",
+                 reqtype,
+                 "",
+                 *date,
+                 resource);
+
+        return sign_req;
+}
+
+char*
+aws_b64_encode(const unsigned char *input, int length)
+{
+        BIO     *bio, *b64;
+        BUF_MEM *bptr;
+        char    *buff = NULL;
+
+        b64 = BIO_new(BIO_f_base64());
+        bio = BIO_new(BIO_s_mem());
+        b64 = BIO_push(b64, bio);
+        BIO_write(b64, input, length);
+        BIO_flush(b64);
+        BIO_get_mem_ptr(b64, &bptr);
+
+        buff = GF_CALLOC(1, (bptr->length), gf_common_mt_char);
+        memcpy(buff, bptr->data, bptr->length - 1);
+        buff[bptr->length - 1] = 0;
+
+        BIO_free_all(b64);
+
+        return buff;
+}
+
+char *
+aws_sign_request(char *const str, char *awssekey)
+{
+#if (OPENSSL_VERSION_NUMBER < 0x1010002f)
+        HMAC_CTX  ctx;
+#endif
+        HMAC_CTX *pctx = NULL;;
+
+        unsigned char md[256];
+        unsigned len;
+        char *base64 = NULL;
+
+#if (OPENSSL_VERSION_NUMBER < 0x1010002f)
+        HMAC_CTX_init (&ctx);
+        pctx = &ctx;
+#else
+        pctx = HMAC_CTX_new ();
+#endif
+        HMAC_Init_ex (pctx, awssekey, strlen(awssekey), EVP_sha1(), NULL);
+        HMAC_Update (pctx, (unsigned char *)str, strlen(str));
+        HMAC_Final (pctx, (unsigned char *)md, &len);
+
+#if (OPENSSL_VERSION_NUMBER < 0x1010002f)
+        HMAC_CTX_cleanup (pctx);
+#else
+        HMAC_CTX_free (pctx);
+#endif
+        base64 = aws_b64_encode(md, len);
+
+        return base64;
+}
+
+int
+aws_dlwritev_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                 int op_ret, int op_errno, struct iatt *prebuf,
+                 struct iatt *postbuf, dict_t *xdata)
+{
+        aws_private_t    *priv = NULL;
+
+        if (op_ret == -1) {
+                gf_msg (this->name, GF_LOG_ERROR, 0, op_errno, "write failed "
+                        ". Aborting Download");
+
+                priv = this->private;
+                pthread_spin_lock (&(priv->lock));
+                {
+                        priv->abortdl = _gf_true;
+                }
+                pthread_spin_unlock (&(priv->lock));
+        }
+
+        CS_STACK_DESTROY (frame);
+
+        return op_ret;
+}
+
+size_t
+aws_write_callback (void *dlbuf, size_t size, size_t nitems, void *mainframe)
+{
+        call_frame_t            *frame = NULL;
+        fd_t                    *dlfd = NULL;
+        int                      ret = 0;
+        cs_local_t              *local = NULL;
+        struct iovec             iov = {0,};
+        struct iobref           *iobref = NULL;
+        struct iobuf            *iobuf = NULL;
+        struct iovec             dliov = {0, };
+        size_t                   tsize = 0;
+        xlator_t                *this = NULL;
+        cs_private_t            *xl_priv = NULL;
+        aws_private_t           *priv = NULL;
+        call_frame_t            *dlframe = NULL;
+
+        frame = (call_frame_t *)mainframe;
+        this = frame->this;
+        xl_priv = this->private;
+        priv = xl_priv->stores->config;
+
+        pthread_spin_lock (&(priv->lock));
+        {
+                /* returning size other than the size passed from curl will
+                 * abort further download*/
+                if (priv->abortdl) {
+                        gf_msg (this->name, GF_LOG_ERROR, 0, 0,
+                                "aborting download");
+                        pthread_spin_unlock (&(priv->lock));
+                        return 0;
+                }
+        }
+        pthread_spin_unlock (&(priv->lock));
+
+        local = frame->local;
+        dlfd = local->dlfd;
+        tsize = size * nitems;
+
+        dliov.iov_base = (void *)dlbuf;
+        dliov.iov_len = tsize;
+
+        ret = iobuf_copy (this->ctx->iobuf_pool, &dliov, 1, &iobref, &iobuf,
+                          &iov);
+        if (ret) {
+                gf_msg (this->name, GF_LOG_ERROR, 0, 0, "iobuf_copy failed");
+                goto out;
+        }
+
+        /* copy frame */
+        dlframe = copy_frame (frame);
+        if (!dlframe) {
+                gf_msg (this->name, GF_LOG_ERROR, 0, 0, "copy_frame failed");
+                tsize = 0;
+                goto out;
+        }
+
+        STACK_WIND (dlframe, aws_dlwritev_cbk,  FIRST_CHILD (this),
+                    FIRST_CHILD (this)->fops->writev, dlfd,
+                    &iov, 1, local->dloffset, 0, iobref, NULL);
+
+        local->dloffset += tsize;
+
+out:
+        if (iobuf)
+                iobuf_unref (iobuf);
+        if (iobref)
+                iobref_unref (iobref);
+
+        return tsize;
+}
+
+int
+aws_download_s3 (call_frame_t *frame, void *config)
+{
+        char                    buf[1024];
+        CURL                   *handle = NULL;
+        struct curl_slist      *slist = NULL;
+        struct curl_slist      *tmp = NULL;
+        xlator_t               *this = NULL;
+        int                     ret = 0;
+        int                     debug = 1;
+        CURLcode                res;
+        char                    errbuf[CURL_ERROR_SIZE];
+        size_t                  len = 0;
+        long                    responsecode;
+        char                    *sign_req       = NULL;
+        char                    *date           = NULL;
+        char                    *const reqtype  = "GET";
+        char                    *signature      = NULL;
+        cs_local_t              *local          = NULL;
+        char                    resource[4096] = {0,};
+        aws_private_t           *priv           = NULL;
+
+        local = frame->local;
+
+        priv = (aws_private_t *)config;
+
+        if (!priv->bucketid || !priv->hostname || !priv->awssekey ||
+            !priv->awskeyid) {
+                ret = -1;
+                goto out;
+        }
+
+        sign_req = aws_form_request (resource, &date, reqtype, priv->bucketid,
+                                    local->remotepath);
+        if (!sign_req) {
+                gf_msg (this->name, GF_LOG_ERROR, 0, 0, "null sign_req, "
+                        "aborting download");
+                ret = -1;
+                goto out;
+        }
+
+        gf_msg_debug ("CS", 0, "sign_req %s date %s", sign_req, date);
+
+        signature = aws_sign_request (sign_req, priv->awssekey);
+        if (!signature) {
+                gf_msg ("CS", GF_LOG_ERROR, 0, 0, "null signature, "
+                        "aborting download");
+                ret = -1;
+                goto out;
+        }
+
+        handle = curl_easy_init();
+        this = frame->this;
+
+        snprintf (buf, 1024, "Date: %s", date);
+        slist = curl_slist_append(slist, buf);
+        snprintf (buf, sizeof(buf), "Authorization: AWS %s:%s", priv->awskeyid,
+                  signature);
+        slist = curl_slist_append(slist, buf);
+        snprintf(buf, sizeof(buf), "https://%s/%s", priv->hostname, resource);
+
+        if (gf_log_get_loglevel () >= GF_LOG_DEBUG) {
+                tmp = slist;
+                while (tmp) {
+                        gf_msg_debug (this->name, 0, "slist for curl - %s",
+                                      tmp->data);
+                        tmp = tmp->next;
+                }
+        }
+
+        curl_easy_setopt (handle, CURLOPT_HTTPHEADER, slist);
+        curl_easy_setopt (handle, CURLOPT_URL, buf);
+        curl_easy_setopt (handle, CURLOPT_WRITEFUNCTION, aws_write_callback);
+        curl_easy_setopt (handle, CURLOPT_WRITEDATA, frame);
+        curl_easy_setopt (handle, CURLOPT_VERBOSE, debug);
+        curl_easy_setopt (handle, CURLOPT_ERRORBUFFER, errbuf);
+
+        res = curl_easy_perform(handle);
+        if (res != CURLE_OK) {
+                gf_msg (this->name, GF_LOG_ERROR, 0, 0,
+                        "download failed. err: %s\n", curl_easy_strerror(res));
+                ret = -1;
+                len = strlen(errbuf);
+                if (len) {
+                        gf_msg (this->name, GF_LOG_ERROR, 0, 0,
+                                "curl failure %s", errbuf);
+                } else {
+                        gf_msg (this->name, GF_LOG_ERROR, 0, 0, "curl error "
+                                "%s\n", curl_easy_strerror(res));
+                }
+        }
+
+        if (res == CURLE_OK) {
+                curl_easy_getinfo (handle, CURLINFO_RESPONSE_CODE,
+                                   &responsecode);
+                gf_msg_debug (this->name, 0, "response code %ld", responsecode);
+                if (responsecode != 200) {
+                        ret = -1;
+                        gf_msg (this->name, GF_LOG_ERROR, 0, 0,
+                                "curl download failed");
+                }
+        }
+
+        curl_slist_free_all(slist);
+        curl_easy_cleanup(handle);
+
+out:
+        return ret;
+}
+
+struct volume_options cs_options[] = {
+        { .key        = {"s3plugin-seckey"},
+          .type       =  GF_OPTION_TYPE_STR,
+          .description = "aws secret key"
+        },
+        { .key        = {"s3plugin-keyid"},
+          .type       =  GF_OPTION_TYPE_STR,
+          .description = "aws key ID"
+
+        },
+        { .key        = {"s3plugin-bucketid"},
+          .type       =  GF_OPTION_TYPE_STR,
+          .description = "aws bucketid"
+        },
+        { .key        = {"s3plugin-hostname"},
+          .type       =  GF_OPTION_TYPE_STR,
+          .description = "aws hostname e.g. s3.amazonaws.com"
+        },
+        { .key         = {NULL} },
+};
diff --git a/xlators/features/cloudsync/src/cloudsync-plugins/src/cloudsyncs3/src/libcloudsyncs3.h b/xlators/features/cloudsync/src/cloudsync-plugins/src/cloudsyncs3/src/libcloudsyncs3.h
new file mode 100644
index 00000000000..c233e1c96f7
--- /dev/null
+++ b/xlators/features/cloudsync/src/cloudsync-plugins/src/cloudsyncs3/src/libcloudsyncs3.h
@@ -0,0 +1,51 @@
+/*
+  Copyright (c) 2018 Red Hat, Inc. <http://www.redhat.com>
+  This file is part of GlusterFS.
+
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
+*/
+#ifndef _LIBAWS_H
+#define _LIBAWS_H
+
+#include "glusterfs.h"
+#include "call-stub.h"
+#include "xlator.h"
+#include "syncop.h"
+#include <curl/curl.h>
+#include "cloudsync-common.h"
+#include "libcloudsyncs3-mem-types.h"
+
+
+char*
+aws_b64_encode(const unsigned char *input, int length);
+
+size_t
+aws_write_callback(void *dlbuf, size_t size, size_t nitems, void *mainframe);
+
+int
+aws_download_s3 (call_frame_t *frame, void *config);
+
+int
+aws_dlwritev_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                 int op_ret, int op_errno, struct iatt *prebuf,
+                 struct iatt *postbuf, dict_t *xdata);
+
+void *
+aws_init (xlator_t *this);
+
+int
+aws_reconfigure (xlator_t *this, dict_t *options);
+
+char *
+aws_form_request (char *resource, char **date, char *reqtype, char *bucketid,
+                  char *filepath);
+char *
+aws_sign_request(char *const str, char *awssekey);
+
+void
+aws_fini (void *config);
+
+#endif
diff --git a/xlators/features/cloudsync/src/cloudsync-plugins/src/cloudsyncs3/src/libcloudsyncs3.sym b/xlators/features/cloudsync/src/cloudsync-plugins/src/cloudsyncs3/src/libcloudsyncs3.sym
new file mode 100644
index 00000000000..0bc273670d5
--- /dev/null
+++ b/xlators/features/cloudsync/src/cloudsync-plugins/src/cloudsyncs3/src/libcloudsyncs3.sym
@@ -0,0 +1 @@
+store_ops