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http_io.c
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http_io.c
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/*
* s3backer - FUSE-based single file backing store via Amazon S3
*
* Copyright 2008-2020 Archie L. Cobbs <archie.cobbs@gmail.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* 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.
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations including
* the two.
*
* You must obey the GNU General Public License in all respects for all
* of the code used other than OpenSSL. If you modify file(s) with this
* exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do
* so, delete this exception statement from your version. If you delete
* this exception statement from all source files in the program, then
* also delete it here.
*/
#include "s3backer.h"
#include "block_part.h"
#include "http_io.h"
#include "compress.h"
#include "util.h"
/* HTTP definitions */
#define HTTP_GET "GET"
#define HTTP_PUT "PUT"
#define HTTP_DELETE "DELETE"
#define HTTP_HEAD "HEAD"
#define HTTP_POST "POST"
#define HTTP_NOT_MODIFIED 304
#define HTTP_UNAUTHORIZED 401
#define HTTP_FORBIDDEN 403
#define HTTP_NOT_FOUND 404
#define HTTP_PRECONDITION_FAILED 412
#define AUTH_HEADER "Authorization"
#define CTYPE_HEADER "Content-Type"
#define CONTENT_ENCODING_HEADER "Content-Encoding"
#define ACCEPT_ENCODING_HEADER "Accept-Encoding"
#define ETAG_HEADER "ETag"
#define CONTENT_ENCODING_ENCRYPT "encrypt"
#define MD5_HEADER "Content-MD5"
#define ACL_HEADER "x-amz-acl"
#define CONTENT_SHA256_HEADER "x-amz-content-sha256"
#define SSE_HEADER "x-amz-server-side-encryption"
#define SSE_KEY_ID_HEADER "x-amz-server-side-encryption-aws-kms-key-id"
#define STORAGE_CLASS_HEADER "x-amz-storage-class"
#define FILE_SIZE_HEADER "x-amz-meta-s3backer-filesize"
#define BLOCK_SIZE_HEADER "x-amz-meta-s3backer-blocksize"
#define MOUNT_TOKEN_HEADER "x-amz-meta-s3backer-mount-token"
#define HMAC_HEADER "x-amz-meta-s3backer-hmac"
#define IF_MATCH_HEADER "If-Match"
#define IF_NONE_MATCH_HEADER "If-None-Match"
/* Minumum HTTP status code we consider an error */
#define HTTP_STATUS_ERROR_MINIMUM 300 /* we don't support redirects */
/* MIME type for blocks */
#define CONTENT_TYPE "application/x-s3backer-block"
/* Mount token file */
#define MOUNT_TOKEN_FILE "s3backer-mounted"
#define MOUNT_TOKEN_FILE_MIME_TYPE "text/plain"
/* HTTP `Date' and `x-amz-date' header formats */
#define HTTP_DATE_HEADER "Date"
#define AWS_DATE_HEADER "x-amz-date"
#define HTTP_DATE_BUF_FMT "%a, %d %b %Y %H:%M:%S GMT"
#define AWS_DATE_BUF_FMT "%Y%m%dT%H%M%SZ"
#define DATE_BUF_SIZE 64
/* Upper bound on the length of an URL representing one block */
#define URL_BUF_SIZE(config) (strlen((config)->baseURL) \
+ strlen((config)->bucket) + 1 \
+ strlen((config)->prefix) \
+ S3B_BLOCK_NUM_DIGITS \
+ strlen(BLOCK_HASH_PREFIX_SEPARATOR) \
+ S3B_BLOCK_NUM_DIGITS + 2)
/* Separator string used when "--blockHashPrefix" is in effect */
#define BLOCK_HASH_PREFIX_SEPARATOR "-"
/* Bucket listing API constants */
#define LIST_PARAM_MARKER "marker"
#define LIST_PARAM_PREFIX "prefix"
#define LIST_PARAM_MAX_KEYS "max-keys"
#define LIST_ELEM_LIST_BUCKET_RESLT "ListBucketResult"
#define LIST_ELEM_IS_TRUNCATED "IsTruncated"
#define LIST_ELEM_CONTENTS "Contents"
#define LIST_ELEM_KEY "Key"
#define LIST_TRUE "true"
/* Bulk Delete API constants */
#define DELETE_ELEM_DELETE "Delete"
#define DELETE_ELEM_OBJECT "Object"
#define DELETE_ELEM_KEY "Key"
#define DELETE_ELEM_DELETE_RESULT "DeleteResult"
#define DELETE_ELEM_ERROR "Error"
#define DELETE_ELEM_CODE "Code"
#define DELETE_ELEM_MESSAGE "Message"
/* How many blocks to list or delete at a time */
#define LIST_BLOCKS_CHUNK 1000
#define DELETE_BLOCKS_CHUNK 1000
/* Maximum error payload size in bytes */
#define MAX_ERROR_PAYLOAD_SIZE 0x100000
/* PBKDF2 key generation iterations */
#define PBKDF2_ITERATIONS 5000
/* Enable to debug encryption key stuff */
#define DEBUG_ENCRYPTION 0
/* Enable to debug authentication stuff */
#define DEBUG_AUTHENTICATION 0
/* Enable to debug parsing block list response */
#define DEBUG_BLOCK_LIST 0
/* Version 4 authentication stuff */
#define SIGNATURE_ALGORITHM "AWS4-HMAC-SHA256"
#define ACCESS_KEY_PREFIX "AWS4"
#define S3_SERVICE_NAME "s3"
#define SIGNATURE_TERMINATOR "aws4_request"
#define SECURITY_TOKEN_HEADER "x-amz-security-token"
/* EC2 IAM info URL */
#define EC2_IAM_META_DATA_URLBASE "http://169.254.169.254/latest/meta-data/iam/security-credentials/"
#define EC2_IAM_META_DATA_ACCESSID "AccessKeyId"
#define EC2_IAM_META_DATA_ACCESSKEY "SecretAccessKey"
#define EC2_IAM_META_DATA_TOKEN "Token"
/* TCP keep-alive */
#define TCP_KEEP_ALIVE_IDLE 200
#define TCP_KEEP_ALIVE_INTERVAL 60
/* Misc */
#define WHITESPACE " \t\v\f\r\n"
#if MD5_DIGEST_LENGTH != 16
#error unexpected MD5_DIGEST_LENGTH
#endif
#if SHA_DIGEST_LENGTH != 20
#error unexpected MD5_DIGEST_LENGTH
#endif
/*
* HTTP-based implementation of s3backer_store.
*
* This implementation does no caching or consistency checking.
*/
/* Internal definitions */
struct curl_holder {
CURL *curl;
LIST_ENTRY(curl_holder) link;
};
/* Block survey per-thread info */
struct http_io_survey {
struct http_io_private *priv;
pthread_t thread;
s3b_block_t min_name;
s3b_block_t max_name;
block_list_func_t *callback;
void *callback_arg;
};
/* Internal state */
struct http_io_private {
struct http_io_conf *config;
struct http_io_stats stats;
LIST_HEAD(, curl_holder) curls;
pthread_mutex_t mutex;
bitmap_t *non_zero; // config->nonzero_bitmap is moved to here
pthread_t iam_thread; // IAM credentials refresh thread
u_char iam_thread_alive; // IAM thread was successfully created
u_char iam_thread_shutdown; // Flag to the IAM thread telling it to exit
/* Block survey info */
struct http_io_survey *survey_threads; // survey threads that are running now, if any
u_int num_survey_threads; // length of "survey_threads" array
pthread_cond_t survey_done; // indicates last survey thread has finished
volatile int abort_survey; // set to 1 to abort block survey
int survey_error; // error from any survey thread
/* Encryption info */
const EVP_CIPHER *cipher;
u_int keylen; // length of key and ivkey
u_char key[EVP_MAX_KEY_LENGTH]; // key used to encrypt data
u_char ivkey[EVP_MAX_KEY_LENGTH]; // key used to encrypt block number to get IV for data
};
/* I/O buffers */
struct http_io_bufs {
size_t rdremain;
size_t wrremain;
char *rddata;
const char *wrdata;
};
/* I/O state when reading/writing a block */
struct http_io {
// I/O buffers
struct http_io_bufs bufs;
// Configuration
struct http_io_conf *config; // configuration
// XML parser info
XML_Parser xml; // XML parser
int xml_error; // XML parse error (if any)
int xml_error_line; // XML parse error line
int xml_error_column; // XML parse error column
char *xml_path; // Current XML path
char *xml_text; // Current XML text
int handler_error; // error encountered during parsing
// Bucket object listing info
int list_truncated; // returned list was truncated
char *start_after; // where to start next round of listing
s3b_block_t min_name; // inclusive lower bound for block name/prefix
s3b_block_t max_name; // inclusive upper bound for block name/prefix
s3b_block_t *block_list; // the blocks we found this iteration
u_int num_blocks; // number of blocks in "block_list"
// Bulk delete info
char *bulk_delete_err_key;
char *bulk_delete_err_code;
char *bulk_delete_err_msg;
// Other info that needs to be passed around
CURL *curl; // back reference to CURL instance
const char *method; // HTTP method
const char *url; // HTTP URL
struct curl_slist *headers; // HTTP headers
const char *sse; // Server Side Encryption
void *dest; // Block data (when reading)
const void *src; // Block data (when writing)
s3b_block_t block_num; // The block we're reading/writing
u_int buf_size; // Size of data buffer
u_int *content_lengthp; // Returned Content-Length
uintmax_t file_size; // file size from "x-amz-meta-s3backer-filesize"
u_int block_size; // block size from "x-amz-meta-s3backer-blocksize"
int32_t mount_token; // mount_token from "x-amz-meta-s3backer-mount-token"
u_int expect_304; // a verify request; expect a 304 response
u_char etag[MD5_DIGEST_LENGTH];// parsed ETag header (must look like an MD5 hash)
u_char hmac[SHA_DIGEST_LENGTH];// parsed "x-amz-meta-s3backer-hmac" header
char content_encoding[32]; // received content encoding
check_cancel_t *check_cancel; // write check-for-cancel callback
void *check_cancel_arg; // write check-for-cancel callback argument
// Info used to capture error response payloads
long http_status; // response status, if known, else zero
char *error_payload; // payload of error response
size_t error_payload_len; // error response length
};
/* CURL prepper function type */
typedef void http_io_curl_prepper_t(CURL *curl, struct http_io *io);
/* s3backer_store functions */
static int http_io_create_threads(struct s3backer_store *s3b);
static int http_io_meta_data(struct s3backer_store *s3b, off_t *file_sizep, u_int *block_sizep);
static int http_io_set_mount_token(struct s3backer_store *s3b, int32_t *old_valuep, int32_t new_value);
static int http_io_read_block(struct s3backer_store *s3b, s3b_block_t block_num, void *dest,
u_char *actual_etag, const u_char *expect_etag, int strict);
static int http_io_write_block(struct s3backer_store *s3b, s3b_block_t block_num, const void *src, u_char *etag,
check_cancel_t *check_cancel, void *check_cancel_arg);
static int http_io_read_block_part(struct s3backer_store *s3b, s3b_block_t block_num, u_int off, u_int len, void *dest);
static int http_io_write_block_part(struct s3backer_store *s3b, s3b_block_t block_num, u_int off, u_int len, const void *src);
static int http_io_bulk_zero(struct s3backer_store *const s3b, const s3b_block_t *block_nums, u_int num_blocks);
static int http_io_survey_non_zero(struct s3backer_store *s3b, block_list_func_t *callback, void *arg);
static int http_io_shutdown(struct s3backer_store *s3b);
static void http_io_destroy(struct s3backer_store *s3b);
/* Other functions */
static http_io_curl_prepper_t http_io_head_prepper;
static http_io_curl_prepper_t http_io_read_prepper;
static http_io_curl_prepper_t http_io_write_prepper;
static http_io_curl_prepper_t http_io_xml_prepper;
static http_io_curl_prepper_t http_io_iamcreds_prepper;
/* S3 REST API functions */
static void http_io_get_block_url(char *buf, size_t bufsiz, struct http_io_conf *config, s3b_block_t block_num);
static void http_io_get_mount_token_file_url(char *buf, size_t bufsiz, struct http_io_conf *config);
static int http_io_add_auth(struct http_io_private *priv, struct http_io *io, time_t now, const void *payload, size_t plen);
static int http_io_add_auth2(struct http_io_private *priv, struct http_io *io, time_t now, const void *payload, size_t plen);
static int http_io_add_auth4(struct http_io_private *priv, struct http_io *io, time_t now, const void *payload, size_t plen);
static size_t url_encode(const char *src, size_t len, char *dst, int buflen, int encode_slash);
static void digest_url_encoded(EVP_MD_CTX* hash_ctx, const char *data, size_t len, int encode_slash);
/* EC2 IAM thread */
static void *update_iam_credentials_main(void *arg);
static int update_iam_credentials(struct http_io_private *priv);
static char *parse_json_field(struct http_io_private *priv, const char *json, const char *field);
/* Block survey functions */
static int http_io_list_blocks_range(struct http_io_private *priv,
s3b_block_t min, s3b_block_t max, block_list_func_t *callback, void *arg);
static void *http_io_list_blocks_worker_main(void *arg);
static void http_io_list_blocks_elem_end(void *arg, const XML_Char *name);
static block_list_func_t http_io_list_blocks_callback;
static void http_io_wait_for_survey_threads_to_exit(struct http_io_private *const priv);
/* Bulk delete */
static void http_io_bulk_delete_elem_end(void *arg, const XML_Char *name);
/* XML query functions */
static int http_io_xml_io_init(struct http_io_private *const priv, struct http_io *io, const char *method, char *url);
static int http_io_xml_io_exec(struct http_io_private *const priv, struct http_io *io,
void (*end_handler)(void *arg, const XML_Char *name));
static void http_io_xml_io_destroy(struct http_io_private *const priv, struct http_io *io);
static size_t http_io_curl_xml_reader(const void *ptr, size_t size, size_t nmemb, void *stream);
static void http_io_xml_elem_start(void *arg, const XML_Char *name, const XML_Char **atts);
static void http_io_xml_text(void *arg, const XML_Char *s, int len);
/* HTTP and curl functions */
static int http_io_perform_io(struct http_io_private *priv, struct http_io *io, http_io_curl_prepper_t *prepper);
static size_t http_io_curl_reader(const void *ptr, size_t size, size_t nmemb, void *stream);
static size_t http_io_curl_writer(void *ptr, size_t size, size_t nmemb, void *stream);
static size_t http_io_curl_header(void *ptr, size_t size, size_t nmemb, void *stream);
static struct curl_slist *http_io_add_header(struct http_io_private *priv, struct curl_slist *headers, const char *fmt, ...)
__attribute__ ((__format__ (__printf__, 3, 4)));
static void http_io_add_date(struct http_io_private *priv, struct http_io *const io, time_t now);
static CURL *http_io_acquire_curl(struct http_io_private *priv, struct http_io *io);
static void http_io_release_curl(struct http_io_private *priv, CURL **curlp, int may_cache);
static int http_io_reader_error_check(struct http_io *const io, const void *ptr, size_t len);
static void http_io_free_error_payload(struct http_io *const io);
static void http_io_log_error_payload(struct http_io *const io);
/* Misc */
static void http_io_openssl_locker(int mode, int i, const char *file, int line);
static u_long http_io_openssl_ider(void);
static void http_io_base64_encode(char *buf, size_t bufsiz, const void *data, size_t len);
static u_int http_io_crypt(struct http_io_private *priv,
s3b_block_t block_num, int enc, const u_char *src, u_int len, u_char *dst, u_int dmax);
static void http_io_authsig(struct http_io_private *priv, s3b_block_t block_num, const u_char *src, u_int len, u_char *hmac);
static void update_hmac_from_header(HMAC_CTX *ctx, struct http_io *io,
const char *name, int value_only, char *sigbuf, size_t sigbuflen);
static s3b_block_t http_io_block_hash_prefix(s3b_block_t block_num);
static int http_io_parse_hex(const char *str, u_char *buf, u_int nbytes);
static int http_io_parse_hex_block_num(const char *string, s3b_block_t *block_nump);
static void http_io_prhex(char *buf, const u_char *data, size_t len);
static int http_io_header_name_sort(const void *ptr1, const void *ptr2);
static int http_io_parse_header(struct http_io *io, const char *input,
const char *header, int num_conversions, const char *fmt, ...);
static void http_io_init_io(struct http_io_private *priv, struct http_io *io, const char *method, const char *url);
static void http_io_curl_header_reset(struct http_io *const io);
static int http_io_verify_etag_provided(struct http_io *io);
/* Internal variables */
static pthread_mutex_t *openssl_locks;
static int num_openssl_locks;
static u_char zero_etag[MD5_DIGEST_LENGTH];
static u_char zero_hmac[SHA_DIGEST_LENGTH];
/*
* Constructor
*
* On error, returns NULL and sets `errno'.
*/
struct s3backer_store *
http_io_create(struct http_io_conf *config)
{
struct s3backer_store *s3b;
struct http_io_private *priv;
struct curl_holder *holder;
int nlocks;
int r;
/* Sanity check: we can really only handle one instance */
if (openssl_locks != NULL) {
(*config->log)(LOG_ERR, "http_io_create() called twice");
r = EALREADY;
goto fail0;
}
/* Initialize structures */
if ((s3b = calloc(1, sizeof(*s3b))) == NULL) {
r = errno;
goto fail0;
}
s3b->create_threads = http_io_create_threads;
s3b->meta_data = http_io_meta_data;
s3b->set_mount_token = http_io_set_mount_token;
s3b->read_block = http_io_read_block;
s3b->write_block = http_io_write_block;
s3b->read_block_part = http_io_read_block_part;
s3b->write_block_part = http_io_write_block_part;
s3b->bulk_zero = http_io_bulk_zero;
s3b->survey_non_zero = http_io_survey_non_zero;
s3b->shutdown = http_io_shutdown;
s3b->destroy = http_io_destroy;
if ((priv = calloc(1, sizeof(*priv))) == NULL) {
r = errno;
goto fail1;
}
priv->config = config;
if ((r = pthread_mutex_init(&priv->mutex, NULL)) != 0)
goto fail2;
if ((r = pthread_cond_init(&priv->survey_done, NULL)) != 0) {
goto fail3;
}
LIST_INIT(&priv->curls);
s3b->data = priv;
/* Initialize openssl */
num_openssl_locks = CRYPTO_num_locks();
if ((openssl_locks = malloc(num_openssl_locks * sizeof(*openssl_locks))) == NULL) {
r = errno;
goto fail4;
}
for (nlocks = 0; nlocks < num_openssl_locks; nlocks++) {
if ((r = pthread_mutex_init(&openssl_locks[nlocks], NULL)) != 0)
goto fail5;
}
CRYPTO_set_locking_callback(http_io_openssl_locker);
CRYPTO_set_id_callback(http_io_openssl_ider);
/* Avoid GCC unused-function warnings */
(void)http_io_openssl_locker;
(void)http_io_openssl_ider;
/* Initialize encryption */
if (config->encryption != NULL) {
char saltbuf[strlen(config->bucket) + 1 + strlen(config->prefix) + 1];
u_int cipher_key_len;
u_int cipher_block_size;
u_int cipher_iv_length;
/* Sanity checks */
assert(config->password != NULL);
assert(config->block_size % EVP_MAX_IV_LENGTH == 0);
/* Find encryption algorithm */
OpenSSL_add_all_ciphers();
if ((priv->cipher = EVP_get_cipherbyname(config->encryption)) == NULL) {
(*config->log)(LOG_ERR, "unknown encryption cipher `%s'", config->encryption);
r = EINVAL;
goto fail5;
}
cipher_key_len = EVP_CIPHER_key_length(priv->cipher);
priv->keylen = config->key_length > 0 ? config->key_length : cipher_key_len;
if (priv->keylen < cipher_key_len || priv->keylen > sizeof(priv->key)) {
(*config->log)(LOG_ERR, "key length %u for cipher `%s' is out of range", priv->keylen, config->encryption);
r = EINVAL;
goto fail5;
}
/* Sanity check cipher is a block cipher */
cipher_block_size = EVP_CIPHER_block_size(priv->cipher);
cipher_iv_length = EVP_CIPHER_iv_length(priv->cipher);
if (cipher_block_size <= 1 || cipher_block_size != cipher_iv_length) {
(*config->log)(LOG_ERR, "invalid cipher `%s' (block size %u, IV length %u); only block ciphers are supported",
config->encryption, cipher_block_size, cipher_iv_length);
r = EINVAL;
goto fail5;
}
/* Hash password to get bulk data encryption key */
snvprintf(saltbuf, sizeof(saltbuf), "%s/%s", config->bucket, config->prefix);
if ((r = PKCS5_PBKDF2_HMAC_SHA1(config->password, strlen(config->password),
(u_char *)saltbuf, strlen(saltbuf), PBKDF2_ITERATIONS, priv->keylen, priv->key)) != 1) {
(*config->log)(LOG_ERR, "failed to create encryption key");
r = EINVAL;
goto fail5;
}
/* Hash the bulk encryption key to get the IV encryption key */
if ((r = PKCS5_PBKDF2_HMAC_SHA1((char *)priv->key, priv->keylen,
priv->key, priv->keylen, PBKDF2_ITERATIONS, priv->keylen, priv->ivkey)) != 1) {
(*config->log)(LOG_ERR, "failed to create encryption key");
r = EINVAL;
goto fail5;
}
/* Encryption debug */
#if DEBUG_ENCRYPTION
{
char keybuf[priv->keylen * 2 + 1];
char ivkeybuf[priv->keylen * 2 + 1];
http_io_prhex(keybuf, priv->key, priv->keylen);
http_io_prhex(ivkeybuf, priv->ivkey, priv->keylen);
(*config->log)(LOG_DEBUG, "ENCRYPTION INIT: cipher=\"%s\" pass=\"%s\" salt=\"%s\" key=0x%s ivkey=0x%s", config->encryption, config->password, saltbuf, keybuf, ivkeybuf);
}
#endif
}
/* Initialize cURL */
curl_global_init(CURL_GLOBAL_ALL);
/* Initialize IAM credentials */
if (config->ec2iam_role != NULL && (r = update_iam_credentials(priv)) != 0)
goto fail6;
/* Take ownership of non-zero block bitmap */
priv->non_zero = config->nonzero_bitmap;
config->nonzero_bitmap = NULL;
/* Done */
return s3b;
fail6:
while ((holder = LIST_FIRST(&priv->curls)) != NULL) {
curl_easy_cleanup(holder->curl);
LIST_REMOVE(holder, link);
free(holder);
}
curl_global_cleanup();
fail5:
CRYPTO_set_locking_callback(NULL);
CRYPTO_set_id_callback(NULL);
while (nlocks > 0)
pthread_mutex_destroy(&openssl_locks[--nlocks]);
free(openssl_locks);
openssl_locks = NULL;
num_openssl_locks = 0;
fail4:
pthread_cond_destroy(&priv->survey_done);
fail3:
pthread_mutex_destroy(&priv->mutex);
fail2:
free(priv);
fail1:
free(s3b);
fail0:
(*config->log)(LOG_ERR, "http_io creation failed: %s", strerror(r));
errno = r;
return NULL;
}
/*
* Destructor
*/
static void
http_io_destroy(struct s3backer_store *const s3b)
{
struct http_io_private *const priv = s3b->data;
struct curl_holder *holder;
/* Clean up openssl */
while (num_openssl_locks > 0)
pthread_mutex_destroy(&openssl_locks[--num_openssl_locks]);
free(openssl_locks);
openssl_locks = NULL;
CRYPTO_set_locking_callback(NULL);
CRYPTO_set_id_callback(NULL);
/* Clean up cURL */
while ((holder = LIST_FIRST(&priv->curls)) != NULL) {
curl_easy_cleanup(holder->curl);
LIST_REMOVE(holder, link);
free(holder);
}
curl_global_cleanup();
/* Free structures */
pthread_cond_destroy(&priv->survey_done);
pthread_mutex_destroy(&priv->mutex);
bitmap_free(&priv->non_zero);
free(priv);
free(s3b);
}
static int
http_io_shutdown(struct s3backer_store *const s3b)
{
struct http_io_private *const priv = s3b->data;
struct http_io_conf *const config = priv->config;
int r;
/* Signal survey threads to stop */
priv->abort_survey = 1;
/* Lock mutex */
pthread_mutex_lock(&priv->mutex);
/* Shut down IAM thread, if any */
if (priv->iam_thread_alive) {
/* Make IAM thread stop */
priv->iam_thread_shutdown = 1;
if ((r = pthread_cancel(priv->iam_thread)) != 0)
(*config->log)(LOG_ERR, "pthread_cancel: %s", strerror(r));
priv->iam_thread_alive = 0;
/* Reap IAM thread */
CHECK_RETURN(pthread_mutex_unlock(&priv->mutex));
(*config->log)(LOG_DEBUG, "waiting for EC2 IAM thread to shutdown");
if ((r = pthread_join(priv->iam_thread, NULL)) != 0)
(*config->log)(LOG_ERR, "pthread_join: %s", strerror(r));
else
(*config->log)(LOG_DEBUG, "EC2 IAM thread successfully shutdown");
pthread_mutex_lock(&priv->mutex);
}
/* Wait for block survey threads to exit, if any */
http_io_wait_for_survey_threads_to_exit(priv);
/* Unlock mutex */
CHECK_RETURN(pthread_mutex_unlock(&priv->mutex));
/* Done */
return 0;
}
void
http_io_get_stats(struct s3backer_store *s3b, struct http_io_stats *stats)
{
struct http_io_private *const priv = s3b->data;
pthread_mutex_lock(&priv->mutex);
memcpy(stats, &priv->stats, sizeof(*stats));
CHECK_RETURN(pthread_mutex_unlock(&priv->mutex));
}
void
http_io_clear_stats(struct s3backer_store *s3b)
{
struct http_io_private *const priv = s3b->data;
pthread_mutex_lock(&priv->mutex);
memset(&priv->stats, 0, sizeof(priv->stats));
CHECK_RETURN(pthread_mutex_unlock(&priv->mutex));
}
static int
http_io_survey_non_zero(struct s3backer_store *s3b, block_list_func_t *callback, void *arg)
{
struct http_io_private *const priv = s3b->data;
struct http_io_conf *const config = priv->config;
const int max_threads = config->list_blocks_threads;
s3b_block_t last_possible_name;
int r = 0;
/* Determine the last possible block name we need to scan for */
last_possible_name = config->blockHashPrefix ? ~(s3b_block_t)0 : config->num_blocks - 1;
/* Lock mutex */
pthread_mutex_lock(&priv->mutex);
assert(priv->num_survey_threads == 0);
/* Allocate survey_threads array */
if (priv->num_survey_threads != 0) {
r = EINPROGRESS;
goto done;
}
if ((priv->survey_threads = calloc(max_threads, sizeof(*priv->survey_threads))) == NULL) {
r = errno;
(*config->log)(LOG_ERR, "calloc: %s", strerror(r));
goto done;
}
/* Initialize per-thread infos and start threads */
priv->survey_error = 0;
while (priv->num_survey_threads < max_threads) {
const int thread_index = priv->num_survey_threads;
struct http_io_survey *const survey = &priv->survey_threads[thread_index];
/* Configure this thread */
survey->priv = priv;
survey->callback = callback;
survey->callback_arg = arg;
/* Configure this thread's portion of the range, but being careful to handle weird corner cases */
survey->min_name = thread_index > 0 ? survey[-1].max_name + 1 : (s3b_block_t)0;
if (survey->min_name > last_possible_name)
survey->min_name = last_possible_name;
if (thread_index == max_threads - 1)
survey->max_name = last_possible_name;
else {
survey->max_name = ((off_t)last_possible_name * (thread_index + 1)) / max_threads;
if (survey->max_name < survey->min_name)
survey->max_name = survey->min_name;
if (survey->max_name > last_possible_name)
survey->max_name = last_possible_name;
}
/* Start this thread */
if ((r = pthread_create(&survey->thread, NULL, http_io_list_blocks_worker_main, survey)) != 0) {
(*config->log)(LOG_ERR, "pthread_create: %s", strerror(r));
priv->abort_survey = 1;
break;
}
priv->num_survey_threads++;
}
/* Wait for survey threads to finish */
http_io_wait_for_survey_threads_to_exit(priv);
if (r == 0)
r = priv->survey_error;
done:
/* Done */
CHECK_RETURN(pthread_mutex_unlock(&priv->mutex));
return r;
}
// This assumes the mutex is locked
static void
http_io_wait_for_survey_threads_to_exit(struct http_io_private *const priv)
{
/* Wait for all survey threads to finish */
while (priv->num_survey_threads > 0)
pthread_cond_wait(&priv->survey_done, &priv->mutex);
/* Reset state */
free(priv->survey_threads);
priv->survey_threads = NULL;
}
static void *
http_io_list_blocks_worker_main(void *arg)
{
struct http_io_survey *const info = arg;
struct http_io_private *const priv = info->priv;
int r = 0;
/* Scan my range (if non-empty) */
if (info->min_name <= info->max_name)
r = http_io_list_blocks_range(priv, info->min_name, info->max_name, http_io_list_blocks_callback, info);
/* Finish up */
pthread_mutex_lock(&priv->mutex);
if (priv->survey_error == 0)
priv->survey_error = r;
if (priv->num_survey_threads > 0 && --priv->num_survey_threads == 0)
pthread_cond_broadcast(&priv->survey_done);
CHECK_RETURN(pthread_mutex_unlock(&priv->mutex));
return NULL;
}
static int
http_io_list_blocks_callback(void *arg, const s3b_block_t *block_nums, u_int num_blocks)
{
struct http_io_survey *const info = arg;
if (info->priv->abort_survey)
return ECANCELED;
return (*info->callback)(info->callback_arg, block_nums, num_blocks);
}
//
// Scan blocks in the range "min" (inclusive) to "max" (inclusive).
//
// Note "min" and "max" refer to the first S3B_BLOCK_NUM_DIGITS characters of the block's S3 object name (after any "--prefix"),
// not necessarily the block number; these are different things when "--blockHashPrefix" is used, otherwise they are the same.
//
static int
http_io_list_blocks_range(struct http_io_private *priv, s3b_block_t min, s3b_block_t max, block_list_func_t *callback, void *arg)
{
struct http_io_conf *const config = priv->config;
char last_possible_path[strlen(config->prefix) + S3B_BLOCK_NUM_DIGITS + 1];
s3b_block_t block_list[LIST_BLOCKS_CHUNK];
struct http_io io;
int r;
/* Initialize XML query */
if ((r = http_io_xml_io_init(priv, &io, HTTP_GET, NULL)) != 0) // "url" is set below
return r;
io.block_list = block_list;
io.min_name = min;
io.max_name = max;
/* Determine the last possible valid block name (or block hash prefix) we want to search for */
snvprintf(last_possible_path, sizeof(last_possible_path), "%s%0*jx", config->prefix, S3B_BLOCK_NUM_DIGITS, (uintmax_t)max);
/* Initialize "io.start_after", which says where to continue listing names each time around the loop */
if (min == (s3b_block_t)0)
r = asprintf(&io.start_after, "%s%0*jx%c", config->prefix, S3B_BLOCK_NUM_DIGITS - 1, (uintmax_t)0, '0' - 1);
else
r = asprintf(&io.start_after, "%s%0*jx", config->prefix, S3B_BLOCK_NUM_DIGITS, (uintmax_t)(min - 1));
if (r == -1) {
r = errno;
(*config->log)(LOG_ERR, "asprintf: %s", strerror(r));
io.start_after = NULL;
goto done;
}
/* List blocks */
while (1) {
char start_after_urlencoded[3 * strlen(io.start_after) + 1];
char urlbuf[strlen(config->baseURL)
+ strlen(config->bucket)
+ sizeof("?" LIST_PARAM_MARKER "=") + sizeof(start_after_urlencoded)
+ sizeof("&" LIST_PARAM_MAX_KEYS "=") + 16];
/* Format URL (note: URL parameters must be in "canonical query string" format for proper authentication) */
url_encode(io.start_after, strlen(io.start_after), start_after_urlencoded, sizeof(start_after_urlencoded), 1);
snvprintf(urlbuf, sizeof(urlbuf), "%s%s?%s=%s&%s=%u", config->baseURL, config->vhost ? "" : config->bucket,
LIST_PARAM_MARKER, start_after_urlencoded, LIST_PARAM_MAX_KEYS, LIST_BLOCKS_CHUNK);
io.url = urlbuf;
/* Perform operation */
assert(io.num_blocks == 0);
#if DEBUG_BLOCK_LIST
(*config->log)(LOG_DEBUG, "list: querying range [%0*jx, %0*jx] starting after \"%s\"",
S3B_BLOCK_NUM_DIGITS, (uintmax_t)min, S3B_BLOCK_NUM_DIGITS, (uintmax_t)max, io.start_after);
#endif
if ((r = http_io_xml_io_exec(priv, &io, http_io_list_blocks_elem_end)) != 0)
break;
/* Invoke callback with the blocks we found */
if (io.num_blocks > 0) {
if ((r = (*callback)(arg, block_list, io.num_blocks)) != 0)
break;
io.num_blocks = 0;
}
/* Are we done? */
if (!io.list_truncated || strcmp(io.start_after, last_possible_path) >= 0)
break;
}
done:
/* Done */
http_io_xml_io_destroy(priv, &io);
free(io.start_after);
return r;
}
static void
http_io_xml_prepper(CURL *curl, struct http_io *io)
{
if (io->bufs.wrdata != NULL) {
curl_easy_setopt(curl, CURLOPT_READFUNCTION, http_io_curl_writer);
curl_easy_setopt(curl, CURLOPT_READDATA, io);
}
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, http_io_curl_xml_reader);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, io);
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, io->headers);
curl_easy_setopt(curl, CURLOPT_ENCODING, "");
curl_easy_setopt(curl, CURLOPT_HTTP_CONTENT_DECODING, (long)1);
}
static size_t
http_io_curl_xml_reader(const void *ptr, size_t size, size_t nmemb, void *stream)
{
struct http_io *const io = (struct http_io *)stream;
size_t total = size * nmemb;
/* Check for error payload */
if (http_io_reader_error_check(io, ptr, total))
return total;
/* If we are in an error state, just bail */
if (io->xml_error != XML_ERROR_NONE || io->handler_error != 0)
return total;
/* Run new payload bytes through XML parser */
if (XML_Parse(io->xml, ptr, total, 0) != XML_STATUS_OK) {
io->xml_error = XML_GetErrorCode(io->xml);
io->xml_error_line = XML_GetCurrentLineNumber(io->xml);
io->xml_error_column = XML_GetCurrentColumnNumber(io->xml);
}
/* Done */
return total;
}
static void
http_io_xml_elem_start(void *arg, const XML_Char *name, const XML_Char **atts)
{
struct http_io *const io = (struct http_io *)arg;
const size_t plen = strlen(io->xml_path);
char *newbuf;
/* If we are in an error state, just bail */
if (io->xml_error != XML_ERROR_NONE || io->handler_error != 0)
return;
/* Update current path */
if ((newbuf = realloc(io->xml_path, plen + 1 + strlen(name) + 1)) == NULL) {
io->handler_error = errno;
(*io->config->log)(LOG_ERR, "realloc: %s", strerror(errno));
return;
}
io->xml_path = newbuf;
io->xml_path[plen] = '/';
strcpy(io->xml_path + plen + 1, name);
/* Reset text buffer */
io->xml_text[0] = '\0';
#if DEBUG_BLOCK_LIST
/* Debug */
(*io->config->log)(LOG_DEBUG, "list: new path: \"%s\"", io->xml_path);
#endif
}
static void
http_io_list_blocks_elem_end(void *arg, const XML_Char *name)
{
struct http_io *const io = (struct http_io *)arg;
struct http_io_conf *const config = io->config;
/* If we are in an error state, just bail */
if (io->xml_error != XML_ERROR_NONE || io->handler_error != 0)
return;
/* Handle <Truncated> tag */
if (strcmp(io->xml_path, "/" LIST_ELEM_LIST_BUCKET_RESLT "/" LIST_ELEM_IS_TRUNCATED) == 0) {
io->list_truncated = strcmp(io->xml_text, LIST_TRUE) == 0;
#if DEBUG_BLOCK_LIST
(*config->log)(LOG_DEBUG, "list: parsed truncated=%d", io->list_truncated);
#endif
goto done;
}
/* Handle <Key> tag */
if (strcmp(io->xml_path, "/" LIST_ELEM_LIST_BUCKET_RESLT "/" LIST_ELEM_CONTENTS "/" LIST_ELEM_KEY) == 0) {
s3b_block_t hash_value;
s3b_block_t block_num;
char *new_start_after;
#if DEBUG_BLOCK_LIST
(*config->log)(LOG_DEBUG, "list: key=\"%s\"", io->xml_text);
#endif
/* Attempt to parse key as a block's object name and add to list if successful */
if (http_io_parse_block(config->prefix, config->num_blocks,
config->blockHashPrefix, io->xml_text, &hash_value, &block_num) == 0) {
#if DEBUG_BLOCK_LIST
(*config->log)(LOG_DEBUG, "list: parsed key=\"%s\" -> hash=%0*jx block=%0*jx",
io->xml_text, S3B_BLOCK_NUM_DIGITS, (uintmax_t)hash_value, S3B_BLOCK_NUM_DIGITS, (uintmax_t)block_num);
#endif
if (hash_value >= io->min_name && hash_value <= io->max_name) { // avoid out-of-range callbacks
if (io->num_blocks < LIST_BLOCKS_CHUNK)
io->block_list[io->num_blocks++] = block_num;
else {
(*config->log)(LOG_ERR, "list: rec'd more than %d blocks?", LIST_BLOCKS_CHUNK);
io->handler_error = EINVAL;
}
}
}
#if DEBUG_BLOCK_LIST
else
(*config->log)(LOG_DEBUG, "list: can't parse key=\"%s\"", io->xml_text);
#endif
/* Save the last name we see as the starting point for next time */
if ((new_start_after = realloc(io->start_after, strlen(io->xml_text) + 1)) == NULL) {
io->handler_error = errno;
(*config->log)(LOG_ERR, "strdup: %s", strerror(errno));
} else {
io->start_after = new_start_after;
strcpy(io->start_after, io->xml_text);
}
}
done:
/* Update current XML path */
assert(strrchr(io->xml_path, '/') != NULL);
*strrchr(io->xml_path, '/') = '\0';
/* Reset text buffer */
io->xml_text[0] = '\0';
}
static void
http_io_xml_text(void *arg, const XML_Char *s, int len)
{
struct http_io *const io = (struct http_io *)arg;
struct http_io_conf *const config = io->config;
size_t current_len;
char *new_buf;
/* If we are in an error state, just bail */
if (io->xml_error != XML_ERROR_NONE || io->handler_error != 0)
return;
/* Extend text buffer */
current_len = strlen(io->xml_text);
if ((new_buf = realloc(io->xml_text, current_len + len + 1)) == NULL) {
io->handler_error = errno;
(*config->log)(LOG_ERR, "realloc(%u + %d): %s", (u_int)current_len, len + 1, strerror(errno));
return;
}
io->xml_text = new_buf;