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Diffstat (limited to 'src/H5FDs3comms.c')
| -rw-r--r-- | src/H5FDs3comms.c | 3593 |
1 files changed, 3593 insertions, 0 deletions
diff --git a/src/H5FDs3comms.c b/src/H5FDs3comms.c new file mode 100644 index 0000000..f08e9d5 --- /dev/null +++ b/src/H5FDs3comms.c @@ -0,0 +1,3593 @@ +/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * + * Copyright by The HDF Group. * + * All rights reserved. * + * * + * This file is part of HDF5. The full HDF5 copyright notice, including * + * terms governing use, modification, and redistribution, is contained in * + * the COPYING file, which can be found at the root of the source code * + * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases. * + * If you do not have access to either file, you may request a copy from * + * help@hdfgroup.org. * + * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ + +/***************************************************************************** + * Read-Only S3 Virtual File Driver (VFD) + * + * Source for S3 Communications module + * + * ***NOT A FILE DRIVER*** + * + * Provide functions and structures required for interfacing with Amazon + * Simple Storage Service (S3). + * + * Provide S3 object access as if it were a local file. + * + * Connect to remote host, send and receive HTTP requests and responses + * as part of the AWS REST API, authenticating requests as appropriate. + * + * Programmer: Jacob Smith + * 2017-11-30 + * + *****************************************************************************/ + +/****************/ +/* Module Setup */ +/****************/ + +/***********/ +/* Headers */ +/***********/ + +#include "H5private.h" /* generic functions */ +#include "H5Eprivate.h" /* error handling */ +#include "H5MMprivate.h" /* memory management */ +#include "H5FDs3comms.h" /* S3 Communications */ + +/****************/ +/* Local Macros */ +/****************/ + +#ifdef H5_HAVE_ROS3_VFD + +/* toggle debugging (enable with 1) + */ +#define S3COMMS_DEBUG 0 + +/* manipulate verbosity of CURL output + * operates separately from S3COMMS_DEBUG + * + * 0 -> no explicit curl output + * 1 -> on error, print failure info to stderr + * 2 -> in addition to above, print information for all performs; sets all + * curl handles with CURLOPT_VERBOSE + */ +#define S3COMMS_CURL_VERBOSITY 0 + +/* size to allocate for "bytes=<first_byte>[-<last_byte>]" HTTP Range value + */ +#define S3COMMS_MAX_RANGE_STRING_SIZE 128 + + +/******************/ +/* Local Typedefs */ +/******************/ + +/********************/ +/* Local Structures */ +/********************/ + +/* struct s3r_datastruct + * Structure passed to curl write callback + * pointer to data region and record of bytes written (offset) + */ +struct s3r_datastruct { + unsigned long magic; + char *data; + size_t size; +}; +#define S3COMMS_CALLBACK_DATASTRUCT_MAGIC 0x28c2b2ul + +/********************/ +/* Local Prototypes */ +/********************/ + +size_t curlwritecallback(char *ptr, + size_t size, + size_t nmemb, + void *userdata); + +herr_t H5FD_s3comms_s3r_getsize(s3r_t *handle); + +/*********************/ +/* Package Variables */ +/*********************/ + +/*****************************/ +/* Library Private Variables */ +/*****************************/ + +/*******************/ +/* Local Variables */ +/*******************/ + +/*************/ +/* Functions */ +/*************/ + + +/*---------------------------------------------------------------------------- + * + * Function: curlwritecallback() + * + * Purpose: + * + * Function called by CURL to write received data. + * + * Writes bytes to `userdata`. + * + * Internally manages number of bytes processed. + * + * Return: + * + * - Number of bytes processed. + * - Should equal number of bytes passed to callback. + * - Failure will result in curl error: CURLE_WRITE_ERROR. + * + * Programmer: Jacob Smith + * 2017-08-17 + * + *---------------------------------------------------------------------------- + */ +size_t +curlwritecallback(char *ptr, + size_t size, + size_t nmemb, + void *userdata) +{ + struct s3r_datastruct *sds = (struct s3r_datastruct *)userdata; + size_t product = (size * nmemb); + size_t written = 0; + + if (sds->magic != S3COMMS_CALLBACK_DATASTRUCT_MAGIC) { + return written; + } + + if (size > 0) { + HDmemcpy(&(sds->data[sds->size]), ptr, product); + sds->size += product; + written = product; + } + + return written; + +} /* end curlwritecallback() */ + + +/*---------------------------------------------------------------------------- + * + * Function: H5FD_s3comms_hrb_node_set() + * + * Purpose: + * + * Create, insert, modify, and remove elements in a field node list. + * + * `name` cannot be null; will return FAIL and list will be unaltered. + * + * Entries are accessed via the lowercase representation of their name: + * "Host", "host", and "hOSt" would all access the same node, + * but name's case is relevant in HTTP request output. + * + * List pointer `L` must always point to either of : + * - header node with lowest alphabetical order (by lowername) + * - NULL, if list is empty + * + * Types of operations: + * + * - CREATE + * - If `L` is NULL and `name` and `value` are not NULL, + * a new node is created at `L`, starting a list. + * - MODIFY + * - If a node is found with a matching lowercase name and `value` + * is not NULL, the existing name, value, and cat values are released + * and replaced with the new data. + * - No modifications are made to the list pointers. + * - REMOVE + * - If `value` is NULL, will attempt to remove node with matching + * lowercase name. + * - If no match found, returns FAIL and list is not modified. + * - When removing a node, all its resources is released. + * - If removing the last node in the list, list pointer is set to NULL. + * - INSERT + * - If no nodes exists with matching lowercase name and `value` + * is not NULL, a new node is created, inserted into list + * alphabetically by lowercase name. + * + * Return: + * + * - SUCCESS: `SUCCEED` + * - List was successfully modified + * - FAILURE: `FAIL` + * - Unable to perform operation + * - Forbidden (attempting to remove absent node, e.g.) + * - Internal error + * + * Programmer: Jacob Smith + * 2017-09-22 + * + *---------------------------------------------------------------------------- + */ +herr_t +H5FD_s3comms_hrb_node_set( + hrb_node_t **L, + const char *name, + const char *value) +{ + size_t i = 0; + char *valuecpy = NULL; + char *namecpy = NULL; + size_t namelen = 0; + char *lowername = NULL; + char *nvcat = NULL; + hrb_node_t *node_ptr = NULL; + hrb_node_t *new_node = NULL; + hbool_t is_looking = TRUE; + herr_t ret_value = SUCCEED; + + FUNC_ENTER_NOAPI_NOINIT + +#if S3COMMS_DEBUG + HDfprintf(stdout, "called H5FD_s3comms_hrb_node_set.\n"); + HDprintf("NAME: %s\n", name); + HDprintf("VALUE: %s\n", value); + HDprintf("LIST:\n->"); + for (node_ptr = (*L); node_ptr != NULL; node_ptr = node_ptr->next) { + HDfprintf(stdout, "{%s}\n->", node_ptr->cat); + } + HDprintf("(null)\n"); + fflush(stdout); + node_ptr = NULL; +#endif + + if (name == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "unable to operate on null name.\n"); + } + namelen = HDstrlen(name); + + /*********************** + * PREPARE ALL STRINGS * + **********************/ + + /* copy and lowercase name + */ + lowername = (char *)H5MM_malloc(sizeof(char) * (namelen + 1)); + if (lowername == NULL) { + HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, + "cannot make space for lowercase name copy.\n"); + } + for (i = 0; i < namelen; i++) { + lowername[i] = (char)tolower((int)name[i]); + } + lowername[namelen] = 0; + + /* If value supplied, copy name, value, and concatenated "name: value". + * If NULL, we will be removing a node or doing nothing, so no need for + * copies + */ + if (value != NULL) { + int ret = 0; + size_t valuelen = HDstrlen(value); + size_t catlen = namelen + valuelen + 2; /* +2 from ": " */ + size_t catwrite = catlen + 3; /* 3 not 1 to quiet compiler warning */ + + + namecpy = (char *)H5MM_malloc(sizeof(char) * (namelen + 1)); + if (namecpy == NULL) { + HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, + "cannot make space for name copy.\n"); + } + HDmemcpy(namecpy, name, (namelen + 1)); + + valuecpy = (char *)H5MM_malloc(sizeof(char) * (valuelen + 1)); + if (valuecpy == NULL) { + HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, + "cannot make space for value copy.\n"); + } + HDmemcpy(valuecpy, value, (valuelen + 1)); + + nvcat = (char *)H5MM_malloc(sizeof(char) * catwrite); + if (nvcat == NULL) { + HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, + "cannot make space for concatenated string.\n"); + } + ret = HDsnprintf(nvcat, catwrite, "%s: %s", name, value); + if (ret < 0 || (size_t)ret > catlen) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "cannot concatenate `%s: %s", name, value); + } + HDassert( catlen == HDstrlen(nvcat) ); + + /* create new_node, should we need it + */ + new_node = (hrb_node_t *)H5MM_malloc(sizeof(hrb_node_t)); + if (new_node == NULL) { + HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, + "cannot make space for new set.\n"); + } + + new_node->magic = S3COMMS_HRB_NODE_MAGIC; + new_node->name = NULL; + new_node->value = NULL; + new_node->cat = NULL; + new_node->lowername = NULL; + new_node->next = NULL; + } + + /*************** + * ACT ON LIST * + ***************/ + + if (*L == NULL) { + if (value == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "trying to remove node from empty list"); + } + else { +#if S3COMMS_DEBUG +HDprintf("CREATE NEW\n"); fflush(stdout); +#endif + /******************* + * CREATE NEW LIST * + *******************/ + + new_node->cat = nvcat; + new_node->name = namecpy; + new_node->lowername = lowername; + new_node->value = valuecpy; + + *L = new_node; + goto done; /* bypass further seeking */ + } + } + + /* sanity-check pointer passed in + */ + HDassert( (*L) != NULL ); + HDassert( (*L)->magic == S3COMMS_HRB_NODE_MAGIC ); + node_ptr = (*L); + + /* Check whether to modify/remove first node in list + */ + if (strcmp(lowername, node_ptr->lowername) == 0) { + + is_looking = FALSE; + + if (value == NULL) { +#if S3COMMS_DEBUG +HDprintf("REMOVE HEAD\n"); fflush(stdout); +#endif + /*************** + * REMOVE HEAD * + ***************/ + + *L = node_ptr->next; + +#if S3COMMS_DEBUG +HDprintf("FREEING CAT (node)\n"); fflush(stdout); +#endif + H5MM_xfree(node_ptr->cat); +#if S3COMMS_DEBUG +HDprintf("FREEING LOWERNAME (node)\n"); fflush(stdout); +#endif + H5MM_xfree(node_ptr->lowername); +#if S3COMMS_DEBUG +HDprintf("FREEING NAME (node)\n"); fflush(stdout); +#endif + H5MM_xfree(node_ptr->name); +#if S3COMMS_DEBUG +HDprintf("FREEING VALUE (node)\n"); fflush(stdout); +#endif + H5MM_xfree(node_ptr->value); +#if S3COMMS_DEBUG +HDprintf("MAGIC OK? %s\n", + (node_ptr->magic == S3COMMS_HRB_NODE_MAGIC) ? "YES" : "NO"); +fflush(stdout); +#endif + HDassert( node_ptr->magic == S3COMMS_HRB_NODE_MAGIC ); + node_ptr->magic += 1ul; +#if S3COMMS_DEBUG +HDprintf("FREEING POINTER\n"); fflush(stdout); +#endif + H5MM_xfree(node_ptr); + +#if S3COMMS_DEBUG +HDprintf("FREEING WORKING LOWERNAME\n"); fflush(stdout); +#endif + H5MM_xfree(lowername); lowername = NULL; + } + else { +#if S3COMMS_DEBUG +HDprintf("MODIFY HEAD\n"); fflush(stdout); +#endif + /*************** + * MODIFY HEAD * + ***************/ + + H5MM_xfree(node_ptr->cat); + H5MM_xfree(node_ptr->name); + H5MM_xfree(node_ptr->value); + + node_ptr->name = namecpy; + node_ptr->value = valuecpy; + node_ptr->cat = nvcat; + + H5MM_xfree(lowername); + lowername = NULL; + new_node->magic += 1ul; + H5MM_xfree(new_node); + new_node = NULL; + } + } + else + if (strcmp(lowername, node_ptr->lowername) < 0) { + + is_looking = FALSE; + + if (value == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "trying to remove a node 'before' head"); + } + else { +#if S3COMMS_DEBUG +HDprintf("PREPEND NEW HEAD\n"); fflush(stdout); +#endif + /******************* + * INSERT NEW HEAD * + *******************/ + + new_node->name = namecpy; + new_node->value = valuecpy; + new_node->lowername = lowername; + new_node->cat = nvcat; + new_node->next = node_ptr; + *L = new_node; + } + } + + /*************** + * SEARCH LIST * + ***************/ + + while (is_looking) { + if (node_ptr->next == NULL) { + + is_looking = FALSE; + + if (value == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "trying to remove absent node"); + } + else { +#if S3COMMS_DEBUG +HDprintf("APPEND A NODE\n"); fflush(stdout); +#endif + /******************* + * APPEND NEW NODE * + *******************/ + + HDassert( strcmp(lowername, node_ptr->lowername) > 0 ); + new_node->name = namecpy; + new_node->value = valuecpy; + new_node->lowername = lowername; + new_node->cat = nvcat; + node_ptr->next = new_node; + } + } + else + if (strcmp(lowername, node_ptr->next->lowername) < 0) { + + is_looking = FALSE; + + if (value == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "trying to remove absent node"); + } + else { +#if S3COMMS_DEBUG +HDprintf("INSERT A NODE\n"); fflush(stdout); +#endif + /******************* + * INSERT NEW NODE * + *******************/ + + HDassert( strcmp(lowername, node_ptr->lowername) > 0 ); + new_node->name = namecpy; + new_node->value = valuecpy; + new_node->lowername = lowername; + new_node->cat = nvcat; + new_node->next = node_ptr->next; + node_ptr->next = new_node; + } + } + else + if (strcmp(lowername, node_ptr->next->lowername) == 0) { + + is_looking = FALSE; + + if (value == NULL) { + /***************** + * REMOVE A NODE * + *****************/ + + hrb_node_t *tmp = node_ptr->next; + node_ptr->next = tmp->next; + +#if S3COMMS_DEBUG +HDprintf("REMOVE A NODE\n"); fflush(stdout); +#endif + H5MM_xfree(tmp->cat); + H5MM_xfree(tmp->lowername); + H5MM_xfree(tmp->name); + H5MM_xfree(tmp->value); + + HDassert( tmp->magic == S3COMMS_HRB_NODE_MAGIC ); + tmp->magic += 1ul; + H5MM_xfree(tmp); + + H5MM_xfree(lowername); + lowername = NULL; + } + else { +#if S3COMMS_DEBUG +HDprintf("MODIFY A NODE\n"); fflush(stdout); +#endif + /***************** + * MODIFY A NODE * + *****************/ + + node_ptr = node_ptr->next; + H5MM_xfree(node_ptr->name); + H5MM_xfree(node_ptr->value); + H5MM_xfree(node_ptr->cat); + + HDassert( new_node->magic == S3COMMS_HRB_NODE_MAGIC ); + new_node->magic += 1ul; + H5MM_xfree(new_node); + H5MM_xfree(lowername); + new_node = NULL; + lowername = NULL; + + node_ptr->name = namecpy; + node_ptr->value = valuecpy; + node_ptr->cat = nvcat; + } + } + else { + /**************** + * KEEP LOOKING * + ****************/ + + node_ptr = node_ptr->next; + } + } /* end while is_looking */ + +done: + if (ret_value == FAIL) { + /* clean up + */ + if (nvcat != NULL) { H5MM_xfree(nvcat); } + if (namecpy != NULL) { H5MM_xfree(namecpy); } + if (lowername != NULL) { H5MM_xfree(lowername); } + if (valuecpy != NULL) { H5MM_xfree(valuecpy); } + if (new_node != NULL) { + HDassert( new_node->magic == S3COMMS_HRB_NODE_MAGIC ); + new_node->magic += 1ul; + H5MM_xfree(new_node); + } + } + + FUNC_LEAVE_NOAPI(ret_value); +} /* end H5FD_s3comms_hrb_node_set() */ + + +/*---------------------------------------------------------------------------- + * + * Function: H5FD_s3comms_hrb_destroy() + * + * Purpose: + * + * Destroy and free resources _directly_ associated with an HTTP Buffer. + * + * Takes a pointer to pointer to the buffer structure. + * This allows for the pointer itself to be NULLed from within the call. + * + * If buffer or buffer pointer is NULL, there is no effect. + * + * Headers list at `first_header` is not touched. + * + * - Programmer should re-use or destroy `first_header` pointer + * (hrb_node_t *) as suits their purposes. + * - Recommend fetching prior to destroy() + * e.g., `reuse_node = hrb_to_die->first_header; destroy(hrb_to_die);` + * or maintaining an external reference. + * - Destroy node/list separately as appropriate + * - Failure to account for this will result in a memory leak. + * + * Return: + * + * - SUCCESS: `SUCCEED` + * - successfully released buffer resources + * - if `buf` is NULL or `*buf` is NULL, no effect + * - FAILURE: `FAIL` + * - `buf->magic != S3COMMS_HRB_MAGIC` + * + * Programmer: Jacob Smith + * 2017-07-21 + * + *---------------------------------------------------------------------------- + */ +herr_t +H5FD_s3comms_hrb_destroy(hrb_t **_buf) +{ + hrb_t *buf = NULL; + herr_t ret_value = SUCCEED; + + FUNC_ENTER_NOAPI_NOINIT + +#if S3COMMS_DEBUG + HDfprintf(stdout, "called H5FD_s3comms_hrb_destroy.\n"); +#endif + + if (_buf != NULL && *_buf != NULL) { + buf = *_buf; + if (buf->magic != S3COMMS_HRB_MAGIC) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "pointer's magic does not match.\n"); + } + + H5MM_xfree(buf->verb); + H5MM_xfree(buf->version); + H5MM_xfree(buf->resource); + buf->magic += 1ul; + H5MM_xfree(buf); + *_buf = NULL; + } /* end if `_buf` has some value */ + +done: + FUNC_LEAVE_NOAPI(ret_value) +} /* end H5FD_s3comms_hrb_destroy() */ + + +/*---------------------------------------------------------------------------- + * + * Function: H5FD_s3comms_hrb_init_request() + * + * Purpose: + * + * Create a new HTTP Request Buffer + * + * All non-null arguments should be null-terminated strings. + * + * If `verb` is NULL, defaults to "GET". + * If `http_version` is NULL, defaults to "HTTP/1.1". + * + * `resource` cannot be NULL; should be string beginning with slash + * character ('/'). + * + * All strings are copied into the structure, making them safe from + * modification in source strings. + * + * Return: + * + * - SUCCESS: pointer to new `hrb_t` + * - FAILURE: `NULL` + * + * Programmer: Jacob Smith + * 2017-07-21 + * + *---------------------------------------------------------------------------- + */ +hrb_t * +H5FD_s3comms_hrb_init_request(const char *_verb, + const char *_resource, + const char *_http_version) +{ + hrb_t *request = NULL; + char *res = NULL; + size_t reslen = 0; + hrb_t *ret_value = NULL; + char *verb = NULL; + size_t verblen = 0; + char *vrsn = NULL; + size_t vrsnlen = 0; + + FUNC_ENTER_NOAPI_NOINIT + +#if S3COMMS_DEBUG + HDfprintf(stdout, "called H5FD_s3comms_hrb_init_request.\n"); +#endif + + if (_resource == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, + "resource string cannot be null.\n"); + } + + /* populate valid NULLs with defaults + */ + if (_verb == NULL) { + _verb = "GET"; + } + + if (_http_version == NULL) { + _http_version = "HTTP/1.1"; + } + + /* malloc space for and prepare structure + */ + request = (hrb_t *)H5MM_malloc(sizeof(hrb_t)); + if (request == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_CANTALLOC, NULL, + "no space for request structure"); + } + request->magic = S3COMMS_HRB_MAGIC; + request->body = NULL; + request->body_len = 0; + request->first_header = NULL; + + + + /* malloc and copy strings for the structure + */ + reslen = HDstrlen(_resource); + + if (_resource[0] == '/') { + res = (char *)H5MM_malloc(sizeof(char) * (reslen+1)); + if (res == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_CANTALLOC, NULL, + "no space for resource string"); + } + HDmemcpy(res, _resource, (reslen+1)); + } + else { + res = (char *)H5MM_malloc(sizeof(char) * (reslen+2)); + if (res == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_CANTALLOC, NULL, + "no space for resource string"); + } + *res = '/'; + HDmemcpy((&res[1]), _resource, (reslen+1)); + HDassert( (reslen+1) == HDstrlen(res) ); + } /* end if (else resource string not starting with '/') */ + + verblen = HDstrlen(_verb) + 1; + verb = (char *)H5MM_malloc(sizeof(char) * verblen); + if (verb == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, + "no space for verb string"); + } + HDstrncpy(verb, _verb, verblen); + + vrsnlen = HDstrlen(_http_version) + 1; + vrsn = (char *)H5MM_malloc(sizeof(char) * vrsnlen); + if (vrsn == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, + "no space for http-version string"); + } + HDstrncpy(vrsn, _http_version, vrsnlen); + + + + /* place new copies into structure + */ + request->resource = res; + request->verb = verb; + request->version = vrsn; + + ret_value = request; + +done: + /* if there is an error, clean up after ourselves + */ + if (ret_value == NULL) { + if (request != NULL) H5MM_xfree(request); + if (vrsn != NULL) H5MM_xfree(vrsn); + if (verb != NULL) H5MM_xfree(verb); + if (res != NULL) H5MM_xfree(res); + } + + FUNC_LEAVE_NOAPI(ret_value) +} /* end H5FD_s3comms_hrb_init_request() */ + + +/**************************************************************************** + * S3R FUNCTIONS + ****************************************************************************/ + + +/*---------------------------------------------------------------------------- + * + * Function: H5FD_s3comms_s3r_close() + * + * Purpose: + * + * Close communications through given S3 Request Handle (`s3r_t`) + * and clean up associated resources. + * + * Return: + * + * - SUCCESS: `SUCCEED` + * - FAILURE: `FAIL` + * - fails if handle is null or has invalid magic number + * + * + * Programmer: Jacob Smith + * 2017-08-31 + * + *---------------------------------------------------------------------------- + */ +herr_t +H5FD_s3comms_s3r_close(s3r_t *handle) +{ + herr_t ret_value = SUCCEED; + + FUNC_ENTER_NOAPI_NOINIT + +#if S3COMMS_DEBUG + HDfprintf(stdout, "called H5FD_s3comms_s3r_close.\n"); +#endif + + if (handle == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "handle cannot be null.\n"); + } + if (handle->magic != S3COMMS_S3R_MAGIC) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "handle has invalid magic.\n"); + } + + curl_easy_cleanup(handle->curlhandle); + + H5MM_xfree(handle->secret_id); + H5MM_xfree(handle->region); + H5MM_xfree(handle->signing_key); + + HDassert( handle->httpverb != NULL ); + H5MM_xfree(handle->httpverb); + + if (FAIL == H5FD_s3comms_free_purl(handle->purl)) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "unable to release parsed url structure") + } + + H5MM_xfree(handle); + +done: + FUNC_LEAVE_NOAPI(ret_value) +} /* H5FD_s3comms_s3r_close */ + + +/*---------------------------------------------------------------------------- + * + * Function: H5FD_s3comms_s3r_get_filesize() + * + * Purpose: + * + * Retrieve the filesize of an open request handle. + * + * Wrapper "getter" to hide implementation details. + * + * + * Return: + * + * - SUCCESS: size of file, in bytes, if handle is valid. + * - FAILURE: 0, if handle is NULL or undefined. + * + * Programmer: Jacob Smith 2017-01-14 + * + *---------------------------------------------------------------------------- + */ +size_t +H5FD_s3comms_s3r_get_filesize(s3r_t *handle) +{ + size_t ret_value = 0; + + FUNC_ENTER_NOAPI_NOINIT_NOERR + + if (handle != NULL) { + ret_value = handle->filesize; + } + + FUNC_LEAVE_NOAPI(ret_value) +} /* H5FD_s3comms_s3r_get_filesize */ + + +/*---------------------------------------------------------------------------- + * + * Function: H5FD_s3comms_s3r_getsize() + * + * Purpose: + * + * Get the number of bytes of handle's target resource. + * + * Sets handle and curlhandle with to enact an HTTP HEAD request on file, + * and parses received headers to extract "Content-Length" from response + * headers, storing file size at `handle->filesize`. + * + * Critical step in opening (initiating) an `s3r_t` handle. + * + * Wraps `s3r_read()`. + * Sets curlhandle to write headers to a temporary buffer (using extant + * write callback) and provides no buffer for body. + * + * Upon exit, unsets HTTP HEAD settings from curl handle, returning to + * initial state. In event of error, curl handle state is undefined and is + * not to be trusted. + * + * Return: + * + * - SUCCESS: `SUCCEED` + * - FAILURE: `FAIL` + * + * Programmer: Jacob Smith + * 2017-08-23 + * + *---------------------------------------------------------------------------- + */ +herr_t +H5FD_s3comms_s3r_getsize(s3r_t *handle) +{ + uintmax_t content_length = 0; + CURL *curlh = NULL; + char *end = NULL; + char *headerresponse = NULL; + struct s3r_datastruct sds = { + S3COMMS_CALLBACK_DATASTRUCT_MAGIC, + NULL, + 0 }; + char *start = NULL; + herr_t ret_value = SUCCEED; + + FUNC_ENTER_NOAPI_NOINIT + +#if S3COMMS_DEBUG + HDfprintf(stdout, "called H5FD_s3comms_s3r_getsize.\n"); +#endif + + if (handle == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "handle cannot be null.\n"); + } + if (handle->magic != S3COMMS_S3R_MAGIC) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "handle has invalid magic.\n"); + } + if (handle->curlhandle == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "handle has bad (null) curlhandle.\n") + } + + /******************** + * PREPARE FOR HEAD * + ********************/ + + curlh = handle->curlhandle; + + if ( CURLE_OK != + curl_easy_setopt(curlh, + CURLOPT_NOBODY, + 1L) ) + { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "error while setting CURL option (CURLOPT_NOBODY). " + "(placeholder flags)"); + } + + if ( CURLE_OK != + curl_easy_setopt(curlh, + CURLOPT_HEADERDATA, + &sds) ) + { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "error while setting CURL option (CURLOPT_HEADERDATA). " + "(placeholder flags)"); + } + + HDassert( handle->httpverb == NULL ); + handle->httpverb = (char *)H5MM_malloc(sizeof(char) * 16); + if (handle->httpverb == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_CANTALLOC, FAIL, + "unable to allocate space for S3 request HTTP verb"); + } + HDmemcpy(handle->httpverb, "HEAD", 5); + + headerresponse = (char *)H5MM_malloc(sizeof(char) * CURL_MAX_HTTP_HEADER); + if (headerresponse == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_CANTALLOC, FAIL, + "unable to allocate space for curl header response"); + } + sds.data = headerresponse; + + /******************* + * PERFORM REQUEST * + *******************/ + + /* these parameters fetch the entire file, + * but, with a NULL destination and NOBODY and HEADERDATA supplied above, + * only http metadata will be sent by server and recorded by s3comms + */ + if (FAIL == + H5FD_s3comms_s3r_read(handle, 0, 0, NULL) ) + { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "problem in reading during getsize.\n"); + } + + if (sds.size > CURL_MAX_HTTP_HEADER) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "HTTP metadata buffer overrun\n"); + } else if (sds.size == 0) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "No HTTP metadata\n"); +#if S3COMMS_DEBUG + } else { + HDfprintf(stderr, "GETSIZE: OK\n"); +#endif + } + + + /****************** + * PARSE RESPONSE * + ******************/ + + start = strstr(headerresponse, + "\r\nContent-Length: "); + if (start == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "could not find \"Content-Length\" in response.\n"); + } + + /* move "start" to beginning of value in line; find end of line + */ + start = start + HDstrlen("\r\nContent-Length: "); + end = strstr(start, "\r\n"); + if (end == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "could not find end of content length line"); + } + + /* place null terminator at end of numbers + */ + *end = '\0'; + + content_length = strtoumax((const char *)start, + NULL, + 0); + + if (UINTMAX_MAX > SIZE_MAX && content_length > SIZE_MAX) { + HGOTO_ERROR(H5E_ARGS, H5E_OVERFLOW, FAIL, "content_length overflows size_t\n"); + } + + if (content_length == 0 || + errno == ERANGE) /* errno set by strtoumax*/ + { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "could not convert found \"Content-Length\" response (\"%s\")", + start); /* range is null-terminated, remember */ + } + + handle->filesize = (size_t)content_length; + + /********************** + * UNDO HEAD SETTINGS * + **********************/ + + if ( CURLE_OK != + curl_easy_setopt(curlh, + CURLOPT_NOBODY, + NULL) ) + { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "error while setting CURL option (CURLOPT_NOBODY). " + "(placeholder flags)"); + } + + if ( CURLE_OK != + curl_easy_setopt(curlh, + CURLOPT_HEADERDATA, + NULL) ) + { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "error while setting CURL option (CURLOPT_HEADERDATA). " + "(placeholder flags)"); + } + +done: + H5MM_xfree(headerresponse); + sds.magic += 1; /* set to bad magic */ + + FUNC_LEAVE_NOAPI(ret_value); + +} /* H5FD_s3comms_s3r_getsize */ + + +/*---------------------------------------------------------------------------- + * + * Function: H5FD_s3comms_s3r_open() + * + * Purpose: + * + * Logically 'open' a file hosted on S3. + * + * - create new Request Handle + * - copy supplied url + * - copy authentication info if supplied + * - create CURL handle + * - fetch size of file + * - connect with server and execute HEAD request + * - return request handle ready for reads + * + * To use 'default' port to connect, `port` should be 0. + * + * To prevent AWS4 authentication, pass null pointer to `region`, `id`, + * and `signing_key`. + * + * Uses `H5FD_s3comms_parse_url()` to validate and parse url input. + * + * Return: + * + * - SUCCESS: Pointer to new request handle. + * - FAILURE: NULL + * - occurs if: + * - authentication strings are inconsistent + * - must _all_ be null, or have at least `region` and `id` + * - url is NULL (no filename) + * - unable to parse url (malformed?) + * - error while performing `getsize()` + * + * Programmer: Jacob Smith + * 2017-09-01 + * + *---------------------------------------------------------------------------- + */ +s3r_t * +H5FD_s3comms_s3r_open(const char *url, + const char *region, + const char *id, + const unsigned char *signing_key) +{ + size_t tmplen = 0; + CURL *curlh = NULL; + s3r_t *handle = NULL; + parsed_url_t *purl = NULL; + s3r_t *ret_value = NULL; + + FUNC_ENTER_NOAPI_NOINIT + +#if S3COMMS_DEBUG + HDfprintf(stdout, "called H5FD_s3comms_s3r_open.\n"); +#endif + + + + if (url == NULL || url[0] == '\0') { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, + "url cannot be null.\n"); + } + + if (FAIL == H5FD_s3comms_parse_url(url, &purl)) { + /* probably a malformed url, but could be internal error */ + HGOTO_ERROR(H5E_ARGS, H5E_CANTCREATE, NULL, + "unable to create parsed url structure"); + } + HDassert( purl != NULL ); /* if above passes, this must be true */ + HDassert( purl->magic == S3COMMS_PARSED_URL_MAGIC ); + + handle = (s3r_t *)H5MM_malloc(sizeof(s3r_t)); + if (handle == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_CANTALLOC, NULL, + "could not malloc space for handle.\n"); + } + + handle->magic = S3COMMS_S3R_MAGIC; + handle->purl = purl; + handle->filesize = 0; + handle->region = NULL; + handle->secret_id = NULL; + handle->signing_key = NULL; + handle->httpverb = NULL; + + /************************************* + * RECORD AUTHENTICATION INFORMATION * + *************************************/ + + if ((region != NULL && *region != '\0') || + (id != NULL && *id != '\0') || + (signing_key != NULL && *signing_key != '\0')) + { + /* if one exists, all three must exist + */ + if (region == NULL || region[0] == '\0') { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, + "region cannot be null.\n"); + } + if (id == NULL || id[0] == '\0') { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, + "secret id cannot be null.\n"); + } + if (signing_key == NULL || signing_key[0] == '\0') { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, + "signing key cannot be null.\n"); + } + + /* copy strings + */ + tmplen = HDstrlen(region) + 1; + handle->region = (char *)H5MM_malloc(sizeof(char) * tmplen); + if (handle->region == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, + "could not malloc space for handle region copy.\n"); + } + HDmemcpy(handle->region, region, tmplen); + + tmplen = HDstrlen(id) + 1; + handle->secret_id = (char *)H5MM_malloc(sizeof(char) * tmplen); + if (handle->secret_id == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, + "could not malloc space for handle ID copy.\n"); + } + HDmemcpy(handle->secret_id, id, tmplen); + + tmplen = SHA256_DIGEST_LENGTH; + handle->signing_key = + (unsigned char *)H5MM_malloc(sizeof(unsigned char) * tmplen); + if (handle->signing_key == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, + "could not malloc space for handle key copy.\n"); + } + HDmemcpy(handle->signing_key, signing_key, tmplen); + } /* if authentication information provided */ + + /************************ + * INITIATE CURL HANDLE * + ************************/ + + curlh = curl_easy_init(); + + if (curlh == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, + "problem creating curl easy handle!\n"); + } + + if ( CURLE_OK != + curl_easy_setopt(curlh, + CURLOPT_HTTPGET, + 1L) ) + { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, + "error while setting CURL option (CURLOPT_HTTPGET). " + "(placeholder flags)"); + } + + if ( CURLE_OK != + curl_easy_setopt(curlh, + CURLOPT_HTTP_VERSION, + CURL_HTTP_VERSION_1_1) ) + { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, + "error while setting CURL option (CURLOPT_HTTP_VERSION). " + "(placeholder flags)"); + } + + if ( CURLE_OK != + curl_easy_setopt(curlh, + CURLOPT_FAILONERROR, + 1L) ) + { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, + "error while setting CURL option (CURLOPT_FAILONERROR). " + "(placeholder flags)"); + } + + if ( CURLE_OK != + curl_easy_setopt(curlh, + CURLOPT_WRITEFUNCTION, + curlwritecallback) ) + { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, + "error while setting CURL option (CURLOPT_WRITEFUNCTION). " + "(placeholder flags)"); + } + + if ( CURLE_OK != + curl_easy_setopt(curlh, + CURLOPT_URL, + url) ) + { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, + "error while setting CURL option (CURLOPT_URL). " + "(placeholder flags)"); + } + +#if S3COMMS_CURL_VERBOSITY > 1 + /* CURL will print (to stdout) information for each operation + */ + curl_easy_setopt(curlh, CURLOPT_VERBOSE, 1L); +#endif + + handle->curlhandle = curlh; + + /******************* + * OPEN CONNECTION * + * * * * * * * * * * + * GET FILE SIZE * + *******************/ + + if (FAIL == + H5FD_s3comms_s3r_getsize(handle) ) + { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, + "problem in H5FD_s3comms_s3r_getsize.\n"); + } + + /********************* + * FINAL PREPARATION * + *********************/ + + HDassert( handle->httpverb != NULL ); + HDmemcpy(handle->httpverb, "GET", 4); + + ret_value = handle; + +done: + if (ret_value == NULL) { + if (curlh != NULL) { + curl_easy_cleanup(curlh); + } + if (FAIL == H5FD_s3comms_free_purl(purl)) { + HDONE_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, + "unable to free parsed url structure") + } + if (handle != NULL) { + H5MM_xfree(handle->region); + H5MM_xfree(handle->secret_id); + H5MM_xfree(handle->signing_key); + if (handle->httpverb != NULL) { + H5MM_xfree(handle->httpverb); + } + H5MM_xfree(handle); + } + } + + FUNC_LEAVE_NOAPI(ret_value) + +} /* H5FD_s3comms_s3r_open */ + + +/*---------------------------------------------------------------------------- + * + * Function: H5FD_s3comms_s3r_read() + * + * Purpose: + * + * Read file pointed to by request handle, writing specified + * `offset` .. `offset + len` bytes to buffer `dest`. + * + * If `len` is 0, reads entirety of file starting at `offset`. + * If `offset` and `len` are both 0, reads entire file. + * + * If `offset` or `offset+len` is greater than the file size, read is + * aborted and returns `FAIL`. + * + * Uses configured "curl easy handle" to perform request. + * + * In event of error, buffer should remain unaltered. + * + * If handle is set to authorize a request, creates a new (temporary) + * HTTP Request object (hrb_t) for generating requisite headers, + * which is then translated to a `curl slist` and set in the curl handle + * for the request. + * + * `dest` _may_ be NULL, but no body data will be recorded. + * + * - In general practice, NULL should never be passed in as `dest`. + * - NULL `dest` passed in by internal function `s3r_getsize()`, in + * conjunction with CURLOPT_NOBODY to preempt transmission of file data + * from server. + * + * Return: + * + * - SUCCESS: `SUCCEED` + * - FAILURE: `FAIL` + * + * Programmer: Jacob Smith + * 2017-08-22 + * + *---------------------------------------------------------------------------- + */ +herr_t +H5FD_s3comms_s3r_read(s3r_t *handle, + haddr_t offset, + size_t len, + void *dest) +{ + CURL *curlh = NULL; + CURLcode p_status = CURLE_OK; + struct curl_slist *curlheaders = NULL; + hrb_node_t *headers = NULL; + hrb_node_t *node = NULL; + struct tm *now = NULL; + char *rangebytesstr = NULL; + hrb_t *request = NULL; + int ret = 0; /* working variable to check */ + /* return value of HDsnprintf */ + struct s3r_datastruct *sds = NULL; + herr_t ret_value = SUCCEED; + + FUNC_ENTER_NOAPI_NOINIT + +#if S3COMMS_DEBUG + HDfprintf(stdout, "called H5FD_s3comms_s3r_read.\n"); +#endif + + /************************************** + * ABSOLUTELY NECESSARY SANITY-CHECKS * + **************************************/ + + if (handle == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "handle cannot be null.\n"); + } + if (handle->magic != S3COMMS_S3R_MAGIC) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "handle has invalid magic.\n"); + } + if (handle->curlhandle == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "handle has bad (null) curlhandle.\n") + } + if (handle->purl == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "handle has bad (null) url.\n") + } + HDassert( handle->purl->magic == S3COMMS_PARSED_URL_MAGIC ); + if (offset > handle->filesize || (len + offset) > handle->filesize) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "unable to read past EoF") + } + + curlh = handle->curlhandle; + + /********************* + * PREPARE WRITEDATA * + *********************/ + + if (dest != NULL) { + sds = (struct s3r_datastruct *)H5MM_malloc( + sizeof(struct s3r_datastruct)); + if (sds == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_CANTALLOC, FAIL, + "could not malloc destination datastructure.\n"); + } + + sds->magic = S3COMMS_CALLBACK_DATASTRUCT_MAGIC; + sds->data = (char *)dest; + sds->size = 0; + if (CURLE_OK != + curl_easy_setopt(curlh, + CURLOPT_WRITEDATA, + sds) ) + { + HGOTO_ERROR(H5E_ARGS, H5E_UNINITIALIZED, FAIL, + "error while setting CURL option (CURLOPT_WRITEDATA). " + "(placeholder flags)"); + } + } + + /********************* + * FORMAT HTTP RANGE * + *********************/ + + if (len > 0) { + rangebytesstr = (char *)H5MM_malloc(sizeof(char) * \ + (S3COMMS_MAX_RANGE_STRING_SIZE+1) ); + if (rangebytesstr == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_CANTALLOC, FAIL, + "could not malloc range format string.\n"); + } + ret = HDsnprintf(rangebytesstr, + (S3COMMS_MAX_RANGE_STRING_SIZE), + "bytes="H5_PRINTF_HADDR_FMT"-"H5_PRINTF_HADDR_FMT, + offset, + offset + len - 1); + if (ret <= 0 || ret >= S3COMMS_MAX_RANGE_STRING_SIZE) + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "unable to format HTTP Range value"); + } else if (offset > 0) { + rangebytesstr = (char *)H5MM_malloc(sizeof(char) * \ + (S3COMMS_MAX_RANGE_STRING_SIZE+1)); + if (rangebytesstr == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_CANTALLOC, FAIL, + "could not malloc range format string.\n"); + } + ret = HDsnprintf(rangebytesstr, + (S3COMMS_MAX_RANGE_STRING_SIZE), + "bytes="H5_PRINTF_HADDR_FMT"-", + offset); + if (ret <= 0 || ret >= S3COMMS_MAX_RANGE_STRING_SIZE) + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "unable to format HTTP Range value"); + } + + /******************* + * COMPILE REQUEST * + *******************/ + + if (handle->signing_key == NULL) { + /* Do not authenticate. + */ + if (rangebytesstr != NULL) { + /* Pass in range directly + */ + char *bytesrange_ptr = NULL; /* pointer past "bytes=" portion */ + + bytesrange_ptr = strchr(rangebytesstr, '='); + HDassert( bytesrange_ptr != NULL ); + bytesrange_ptr++; /* move to first char past '=' */ + HDassert( *bytesrange_ptr != '\0' ); + + if (CURLE_OK != + curl_easy_setopt(curlh, + CURLOPT_RANGE, + bytesrange_ptr) ) + { + HGOTO_ERROR(H5E_VFL, H5E_UNINITIALIZED, FAIL, + "error while setting CURL option (CURLOPT_RANGE). "); + } + } + } else { + /* authenticate request + */ + char authorization[512+1]; + /* 512 := approximate max length... + * 67 <len("AWS4-HMAC-SHA256 Credential=///s3/aws4_request," + * "SignedHeaders=,Signature=")> + * + 8 <yyyyMMDD> + * + 64 <hex(sha256())> + * + 128 <max? len(secret_id)> + * + 20 <max? len(region)> + * + 128 <max? len(signed_headers)> + */ + char buffer1[512+1]; /* -> Canonical Request -> Signature */ + char buffer2[256+1]; /* -> String To Sign -> Credential */ + char iso8601now[ISO8601_SIZE]; + char signed_headers[48+1]; + /* should be large enough for nominal listing: + * "host;range;x-amz-content-sha256;x-amz-date" + * + '\0', with "range;" possibly absent + */ + + /* zero start of strings */ + authorization[0] = 0; + buffer1[0] = 0; + buffer2[0] = 0; + iso8601now[0] = 0; + signed_headers[0] = 0; + + /**** VERIFY INFORMATION EXISTS ****/ + + if (handle->region == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "handle must have non-null region.\n"); + } + if (handle->secret_id == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "handle must have non-null secret_id.\n"); + } + if (handle->signing_key == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "handle must have non-null signing_key.\n"); + } + if (handle->httpverb == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "handle must have non-null httpverb.\n"); + } + if (handle->purl->host == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "handle must have non-null host.\n"); + } + if (handle->purl->path == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "handle must have non-null resource.\n"); + } + + /**** CREATE HTTP REQUEST STRUCTURE (hrb_t) ****/ + + request = H5FD_s3comms_hrb_init_request( + (const char *)handle->httpverb, + (const char *)handle->purl->path, + "HTTP/1.1"); + if (request == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "could not allocate hrb_t request.\n"); + } + HDassert( request->magic == S3COMMS_HRB_MAGIC ); + + now = gmnow(); + if (ISO8601NOW(iso8601now, now) != (ISO8601_SIZE - 1)) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "could not format ISO8601 time.\n"); + } + + if (FAIL == + H5FD_s3comms_hrb_node_set( + &headers, + "x-amz-date", + (const char *)iso8601now) ) + { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "unable to set x-amz-date header") + } + if (headers == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "problem building headers list. " + "(placeholder flags)\n"); + } + HDassert( headers->magic == S3COMMS_HRB_NODE_MAGIC ); + + if (FAIL == + H5FD_s3comms_hrb_node_set( + &headers, + "x-amz-content-sha256", + (const char *)EMPTY_SHA256) ) + { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "unable to set x-amz-content-sha256 header") + } + if (headers == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "problem building headers list. " + "(placeholder flags)\n"); + } + HDassert( headers->magic == S3COMMS_HRB_NODE_MAGIC ); + + if (rangebytesstr != NULL) { + if (FAIL == + H5FD_s3comms_hrb_node_set( + &headers, + "Range", + (const char *)rangebytesstr) ) + { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "unable to set range header") + } + if (headers == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "problem building headers list. " + "(placeholder flags)\n"); + } + HDassert( headers->magic == S3COMMS_HRB_NODE_MAGIC ); + } + + if (FAIL == + H5FD_s3comms_hrb_node_set( + &headers, + "Host", + (const char *)handle->purl->host) ) + { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "unable to set host header") + } + if (headers == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "problem building headers list. " + "(placeholder flags)\n"); + } + HDassert( headers->magic == S3COMMS_HRB_NODE_MAGIC ); + + request->first_header = headers; + + /**** COMPUTE AUTHORIZATION ****/ + + if (FAIL == /* buffer1 -> canonical request */ + H5FD_s3comms_aws_canonical_request( + buffer1, + 512, + signed_headers, + 48, + request) ) + { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "(placeholder flags)\n"); + } + if ( FAIL == /* buffer2->string-to-sign */ + H5FD_s3comms_tostringtosign(buffer2, + buffer1, + iso8601now, + handle->region) ) + { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "(placeholder flags)\n"); + } + if (FAIL == /* buffer1 -> signature */ + H5FD_s3comms_HMAC_SHA256(handle->signing_key, + SHA256_DIGEST_LENGTH, + buffer2, + HDstrlen(buffer2), + buffer1) ) + { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "(placeholder flags)\n"); + } + + iso8601now[8] = 0; /* trim to yyyyMMDD */ + ret = S3COMMS_FORMAT_CREDENTIAL(buffer2, + handle->secret_id, + iso8601now, + handle->region, + "s3"); + if (ret == 0 || ret >= S3COMMS_MAX_CREDENTIAL_SIZE) + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "unable to format aws4 credential string"); + + ret = HDsnprintf( + authorization, + 512, + "AWS4-HMAC-SHA256 Credential=%s,SignedHeaders=%s,Signature=%s", + buffer2, + signed_headers, + buffer1); + if (ret <= 0 || ret >= 512) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "unable to format aws4 authorization string"); + } + + /* append authorization header to http request buffer + */ + if (H5FD_s3comms_hrb_node_set( + &headers, + "Authorization", + (const char *)authorization) + == FAIL) + { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "unable to set Authorization header") + } + if (headers == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "problem building headers list. " + "(placeholder flags)\n"); + } + + /* update hrb's "first header" pointer + */ + request->first_header = headers; + + /**** SET CURLHANDLE HTTP HEADERS FROM GENERATED DATA ****/ + + node = request->first_header; + while (node != NULL) { + HDassert( node->magic == S3COMMS_HRB_NODE_MAGIC ); + curlheaders = curl_slist_append(curlheaders, + (const char *)node->cat); + if (curlheaders == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "could not append header to curl slist. " + "(placeholder flags)\n"); + } + node = node->next; + } + + /* sanity-check + */ + if (curlheaders == NULL) { + /* above loop was probably never run */ + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "curlheaders was never populated.\n"); + } + + /* finally, set http headers in curl handle + */ + if (curl_easy_setopt( + curlh, + CURLOPT_HTTPHEADER, + curlheaders) + != CURLE_OK) + { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "error while setting CURL option " + "(CURLOPT_HTTPHEADER). (placeholder flags)"); + } + + } /* end if should authenticate (info provided) */ + + /******************* + * PERFORM REQUEST * + *******************/ + +#if S3COMMS_CURL_VERBOSITY > 0 + /* In event of error, print detailed information to stderr + * This is not the default behavior. + */ + { + long int httpcode = 0; + char curlerrbuf[CURL_ERROR_SIZE]; + curlerrbuf[0] = '\0'; + + if (CURLE_OK != + curl_easy_setopt(curlh, CURLOPT_ERRORBUFFER, curlerrbuf) ) + { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "problem setting error buffer") + } + + p_status = curl_easy_perform(curlh); + + if (p_status != CURLE_OK) { + if (CURLE_OK != + curl_easy_getinfo(curlh, CURLINFO_RESPONSE_CODE, &httpcode) ) + { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "problem getting response code") + } + HDfprintf(stderr, "CURL ERROR CODE: %d\nHTTP CODE: %d\n", + p_status, httpcode); + HDfprintf(stderr, "%s\n", curl_easy_strerror(p_status)); + HGOTO_ERROR(H5E_VFL, H5E_CANTOPENFILE, FAIL, + "problem while performing request.\n"); + } + if (CURLE_OK != + curl_easy_setopt(curlh, CURLOPT_ERRORBUFFER, NULL) ) + { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "problem unsetting error buffer") + } + } /* verbose error reporting */ +#else + p_status = curl_easy_perform(curlh); + + if (p_status != CURLE_OK) { + HGOTO_ERROR(H5E_VFL, H5E_CANTOPENFILE, FAIL, + "curl cannot perform request\n") + } +#endif + +#if S3COMMS_DEBUG + if (dest != NULL) { + HDfprintf(stderr, "len: %d\n", (int)len); + HDfprintf(stderr, "CHECKING FOR BUFFER OVERFLOW\n"); + if (sds == NULL) { + HDfprintf(stderr, "sds is NULL!\n"); + } + else { + HDfprintf(stderr, "sds: 0x%lx\n", (long long)sds); + HDfprintf(stderr, "sds->size: %d\n", (int)sds->size); + if (len > sds->size) { + HDfprintf(stderr, "buffer overwrite\n"); + } + } + } + else { + HDfprintf(stderr, "performed on entire file\n"); + } +#endif + +done: + /* clean any malloc'd resources + */ + if (curlheaders != NULL) { + curl_slist_free_all(curlheaders); + curlheaders = NULL; + } + if (rangebytesstr != NULL) { + H5MM_xfree(rangebytesstr); + rangebytesstr = NULL; + } + if (sds != NULL) { + H5MM_xfree(sds); + sds = NULL; + } + if (request != NULL) { + while (headers != NULL) + if (FAIL == + H5FD_s3comms_hrb_node_set(&headers, headers->name, NULL)) + { + HDONE_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "cannot release header node") + } + HDassert( NULL == headers ); + if (FAIL == H5FD_s3comms_hrb_destroy(&request)) { + HDONE_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "cannot release header request structure") + } + HDassert( NULL == request ); + } + + if (curlh != NULL) { + /* clear any Range */ + if (CURLE_OK != curl_easy_setopt(curlh, CURLOPT_RANGE, NULL) ) { + HDONE_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "cannot unset CURLOPT_RANGE") + } + + /* clear headers */ + if (CURLE_OK != curl_easy_setopt(curlh, CURLOPT_HTTPHEADER, NULL) ) { + HDONE_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "cannot unset CURLOPT_HTTPHEADER") + } + } + + FUNC_LEAVE_NOAPI(ret_value); +} /* H5FD_s3comms_s3r_read */ + + +/**************************************************************************** + * MISCELLANEOUS FUNCTIONS + ****************************************************************************/ + + +/*---------------------------------------------------------------------------- + * + * Function: gmnow() + * + * Purpose: + * + * Get the output of `time.h`'s `gmtime()` call while minimizing setup + * clutter where important. + * + * Return: + * + * Pointer to resulting `struct tm`,as created by gmtime(time_t * T). + * + * Programmer: Jacob Smith + * 2017-07-12 + * + *---------------------------------------------------------------------------- + */ +struct tm * +gmnow(void) +{ + time_t now; + time_t *now_ptr = &now; + struct tm *ret_value = NULL; + + /* Doctor assert, checks against error in time() */ + if ( (time_t)(-1) != time(now_ptr) ) { + ret_value = gmtime(now_ptr); + } + + HDassert( ret_value != NULL ); + + return ret_value; +} /* end gmnow() */ + + +/*---------------------------------------------------------------------------- + * + * Function: H5FD_s3comms_aws_canonical_request() + * + * Purpose: + * + * Compose AWS "Canonical Request" (and signed headers string) + * as defined in the REST API documentation. + * + * Both destination strings are null-terminated. + * + * Destination string arguments must be provided with adequate space. + * + * Canonical Request format: + * + * <HTTP VERB>"\n" + * <resource path>"\n" + * <query string>"\n" + * <header1>"\n" (`lowercase(name)`":"`trim(value)`) + * <header2>"\n" + * ... (headers sorted by name) + * <header_n>"\n" + * "\n" + * <signed headers>"\n" (`lowercase(header 1 name)`";"`header 2 name`;...) + * <hex-string of sha256sum of body> ("e3b0c4429...", e.g.) + * + * Return: + * + * - SUCCESS: `SUCCEED` + * - writes canonical request to respective `...dest` strings + * - FAILURE: `FAIL` + * - one or more input argument was NULL + * - internal error + * + * Programmer: Jacob Smith + * 2017-10-04 + * + *---------------------------------------------------------------------------- + */ +herr_t +H5FD_s3comms_aws_canonical_request( + char *canonical_request_dest, + int _cr_size, + char *signed_headers_dest, + int _sh_size, + hrb_t *http_request) +{ + hrb_node_t *node = NULL; + const char *query_params = ""; /* unused at present */ + herr_t ret_value = SUCCEED; + int ret = 0; + size_t cr_size = (size_t)_cr_size; + size_t sh_size = (size_t)_sh_size; + size_t cr_len = 0; /* working length of canonical request str */ + size_t sh_len = 0; /* working length of signed headers str */ + char tmpstr[256+1]; + tmpstr[256] = 0; /* terminating NULL */ + + /* "query params" refers to the optional element in the URL, e.g. + * http://bucket.aws.com/myfile.txt?max-keys=2&prefix=J + * ^-----------------^ + * + * Not handled/implemented as of 2017-10-xx. + * Element introduced as empty placeholder and reminder. + * Further research to be done if this is ever relevant for the + * VFD use-cases. + */ + + FUNC_ENTER_NOAPI_NOINIT + +#if S3COMMS_DEBUG + HDfprintf(stdout, "called H5FD_s3comms_aws_canonical_request.\n"); +#endif + + if (http_request == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "hrb object cannot be null.\n"); + } + HDassert( http_request->magic == S3COMMS_HRB_MAGIC ); + + if (canonical_request_dest == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "canonical request destination cannot be null.\n"); + } + + if (signed_headers_dest == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "signed headers destination cannot be null.\n"); + } + + /* HTTP verb, resource path, and query string lines + */ + cr_len = (HDstrlen(http_request->verb) + + HDstrlen(http_request->resource) + + HDstrlen(query_params) + + (size_t)3); /* three newline chars */ + if (cr_len >= cr_size) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "not enough space in canonical request"); + } + ret = HDsnprintf( /* TODO: compiler warning */ + canonical_request_dest, + (cr_size-1), + "%s\n%s\n%s\n", + http_request->verb, + http_request->resource, + query_params); + if (ret < 0 || (size_t)ret >= cr_size) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "unable to compose canonical request first line"); + } + + /* write in canonical headers, building signed headers concurrently + */ + node = http_request->first_header; /* assumed sorted */ + while (node != NULL) { + + HDassert(node->magic == S3COMMS_HRB_NODE_MAGIC); + + ret = HDsnprintf( + tmpstr, + 256, + "%s:%s\n", + node->lowername, + node->value); + if (ret < 0 || ret >= 256) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "unable to concatenate HTTP header %s:%s", + node->lowername, + node->value); + } + cr_len += HDstrlen(tmpstr); + if (cr_len + 1 > cr_size) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "not enough space in canonical request"); + } + strcat(canonical_request_dest, tmpstr); + + ret = HDsnprintf( + tmpstr, + 256, + "%s;", + node->lowername); + if (ret < 0 || ret >= 256) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "unable to append semicolon to lowername %s", + node->lowername); + } + sh_len += HDstrlen(tmpstr); + if (sh_len + 1 > sh_size) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "not enough space in signed headers"); + } + strcat(signed_headers_dest, tmpstr); + + node = node->next; + } /* end while node is not NULL */ + + /* remove tailing ';' from signed headers sequence + */ + signed_headers_dest[HDstrlen(signed_headers_dest) - 1] = '\0'; + + /* append signed headers and payload hash + * NOTE: at present, no HTTP body is handled, per the nature of + * requests/range-gets + */ + strcat(canonical_request_dest, "\n"); + strcat(canonical_request_dest, signed_headers_dest); + strcat(canonical_request_dest, "\n"); + strcat(canonical_request_dest, EMPTY_SHA256); + +done: + FUNC_LEAVE_NOAPI(ret_value); +} /* end H5FD_s3comms_aws_canonical_request() */ + + +/*---------------------------------------------------------------------------- + * + * Function: H5FD_s3comms_bytes_to_hex() + * + * Purpose: + * + * Produce human-readable hex string [0-9A-F] from sequence of bytes. + * + * For each byte (char), writes two-character hexadecimal representation. + * + * No null-terminator appended. + * + * Assumes `dest` is allocated to enough size (msg_len * 2). + * + * Fails if either `dest` or `msg` are null. + * + * `msg_len` message length of 0 has no effect. + * + * Return: + * + * - SUCCESS: `SUCCEED` + * - hex string written to `dest` (not null-terminated) + * - FAILURE: `FAIL` + * - `dest == NULL` + * - `msg == NULL` + * + * Programmer: Jacob Smith + * 2017-07-12 + * + *---------------------------------------------------------------------------- + */ +herr_t +H5FD_s3comms_bytes_to_hex( + char *dest, + const unsigned char *msg, + size_t msg_len, + hbool_t lowercase) +{ + size_t i = 0; + herr_t ret_value = SUCCEED; + + FUNC_ENTER_NOAPI_NOINIT + +#if S3COMMS_DEBUG + HDfprintf(stdout, "called H5FD_s3comms_bytes_to_hex.\n"); +#endif + + if (dest == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "hex destination cannot be null.\n") + } + if (msg == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "bytes sequence cannot be null.\n") + } + + for (i = 0; i < msg_len; i++) { + int chars_written = HDsnprintf(&(dest[i * 2]), + 3, /* 'X', 'X', '\n' */ + (lowercase == TRUE) ? "%02x" : "%02X", + msg[i]); + if (chars_written != 2) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "problem while writing hex chars for %c", + msg[i]); + } + } + +done: + FUNC_LEAVE_NOAPI(ret_value); + +} /* end H5FD_s3comms_bytes_to_hex() */ + + +/*---------------------------------------------------------------------------- + * + * Function: H5FD_s3comms_free_purl() + * + * Purpose: + * + * Release resources from a parsed_url_t pointer. + * + * If pointer is null, nothing happens. + * + * Return: + * + * `SUCCEED` (never fails) + * + * Programmer: Jacob Smith + * 2017-11-01 + * + *---------------------------------------------------------------------------- + */ +herr_t +H5FD_s3comms_free_purl(parsed_url_t *purl) +{ + FUNC_ENTER_NOAPI_NOINIT_NOERR + +#if S3COMMS_DEBUG + HDprintf("called H5FD_s3comms_free_purl.\n"); +#endif + + if (purl != NULL) { + HDassert( purl->magic == S3COMMS_PARSED_URL_MAGIC ); + if (purl->scheme != NULL) { H5MM_xfree(purl->scheme); } + if (purl->host != NULL) { H5MM_xfree(purl->host); } + if (purl->port != NULL) { H5MM_xfree(purl->port); } + if (purl->path != NULL) { H5MM_xfree(purl->path); } + if (purl->query != NULL) { H5MM_xfree(purl->query); } + purl->magic += 1ul; + H5MM_xfree(purl); + } + + FUNC_LEAVE_NOAPI(SUCCEED) +} /* end H5FD_s3comms_free_purl() */ + + +/*---------------------------------------------------------------------------- + * + * Function: H5FD_s3comms_HMAC_SHA256() + * + * Purpose: + * + * Generate Hash-based Message Authentication Checksum using the SHA-256 + * hashing algorithm. + * + * Given a key, message, and respective lengths (to accommodate null + * characters in either), generate _hex string_ of authentication checksum + * and write to `dest`. + * + * `dest` must be at least `SHA256_DIGEST_LENGTH * 2` characters in size. + * Not enforceable by this function. + * `dest` will _not_ be null-terminated by this function. + * + * Return: + * + * - SUCCESS: `SUCCEED` + * - hex string written to `dest` (not null-terminated) + * - FAILURE: `FAIL` + * - `dest == NULL` + * - error while generating hex string output + * + * Programmer: Jacob Smith + * 2017-07-?? + * + *---------------------------------------------------------------------------- + */ +herr_t +H5FD_s3comms_HMAC_SHA256( + const unsigned char *key, + size_t key_len, + const char *msg, + size_t msg_len, + char *dest) +{ + unsigned char md[SHA256_DIGEST_LENGTH]; + unsigned int md_len = SHA256_DIGEST_LENGTH; + herr_t ret_value = SUCCEED; + + FUNC_ENTER_NOAPI_NOINIT + +#if S3COMMS_DEBUG + HDfprintf(stdout, "called H5FD_s3comms_HMAC_SHA256.\n"); +#endif + + if (dest == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "destination cannot be null."); + } + + HMAC(EVP_sha256(), + key, + (int)key_len, + (const unsigned char *)msg, + msg_len, + md, + &md_len); + + if (H5FD_s3comms_bytes_to_hex( + dest, + (const unsigned char *)md, + (size_t)md_len, + true) + == FAIL) + { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "could not convert to hex string."); + } + +done: + FUNC_LEAVE_NOAPI(ret_value); +} /* H5FD_s3comms_HMAC_SHA256 */ + + +/*----------------------------------------------------------------------------- + * + * Function: H5FD__s3comms_load_aws_creds_from_file() + * + * Purpose: + * + * Extract AWS configuration information from a target file. + * + * Given a file and a profile name, e.g. "ros3_vfd_test", attempt to locate + * that region in the file. If not found, returns in error and output + * pointers are not modified. + * + * If the profile label is found, attempts to locate and parse configuration + * data, stopping at the first line where: + * + reached end of file + * + line does not start with a recognized setting name + * + * Following AWS documentation, looks for any of: + * + aws_access_key_id + * + aws_secret_access_key + * + region + * + * To be valid, the setting must begin the line with one of the keywords, + * followed immediately by an equals sign '=', and have some data before + * newline at end of line. + * + `spam=eggs` would be INVALID because name is unrecognized + * + `region = us-east-2` would be INVALID because of spaces + * + `region=` would be INVALID because no data. + * + * Upon successful parsing of a setting line, will store the result in the + * corresponding output pointer. If the output pointer is NULL, will skip + * any matching setting line while parsing -- useful to prevent overwrite + * when reading from multiple files. + * + * Return: + * + * + SUCCESS: `SUCCEED` + * + no error. settings may or may not have been loaded. + * + FAILURE: `FAIL` + * + internal error occurred. + * + -1 :: unable to format profile label + * + -2 :: profile name/label not found in file + * + -3 :: some other error + * + * Programmer: Jacob Smith + * 2018-02-27 + * + *----------------------------------------------------------------------------- + */ +static herr_t +H5FD__s3comms_load_aws_creds_from_file( + FILE *file, + const char *profile_name, + char *key_id, + char *access_key, + char *aws_region) +{ + char profile_line[32]; + char buffer[128]; + const char *setting_names[] = { + "region", + "aws_access_key_id", + "aws_secret_access_key", + }; + char * const setting_pointers[] = { + aws_region, + key_id, + access_key, + }; + unsigned setting_count = 3; + herr_t ret_value = SUCCEED; + unsigned buffer_i = 0; + unsigned setting_i = 0; + int found_setting = 0; + char *line_buffer = &(buffer[0]); + + FUNC_ENTER_NOAPI_NOINIT + +#if S3COMMS_DEBUG + HDfprintf(stdout, "called load_aws_creds_from_file.\n"); +#endif + + /* format target line for start of profile */ + if (32 < HDsnprintf(profile_line, 32, "[%s]", profile_name)) { + HGOTO_ERROR(H5E_ARGS, H5E_CANTCOPY, FAIL, + "unable to format profile label") + } + + /* look for start of profile */ + do { + /* clear buffer */ + for (buffer_i=0; buffer_i < 128; buffer_i++) { + buffer[buffer_i] = 0; + } + + line_buffer = fgets(line_buffer, 128, file); + if (line_buffer == NULL) { /* reached end of file */ + goto done; + } + } while (strncmp(line_buffer, profile_line, HDstrlen(profile_line))); + + /* extract credentials from lines */ + do { + /* clear buffer */ + for (buffer_i=0; buffer_i < 128; buffer_i++) { + buffer[buffer_i] = 0; + } + + /* collect a line from file */ + line_buffer = fgets(line_buffer, 128, file); + if (line_buffer == NULL) { + goto done; /* end of file */ + } + + /* loop over names to see if line looks like assignment */ + for (setting_i = 0; setting_i < setting_count; setting_i++) { + size_t setting_name_len = 0; + const char *setting_name = NULL; + char line_prefix[128]; + + setting_name = setting_names[setting_i]; + setting_name_len = HDstrlen(setting_name); + if (HDsnprintf(line_prefix, 128, "%s=", setting_name) < 0) { + HGOTO_ERROR(H5E_ARGS, H5E_CANTCOPY, FAIL, + "unable to format line prefix") + } + + /* found a matching name? */ + if (!HDstrncmp(line_buffer, line_prefix, setting_name_len + 1)) { + found_setting = 1; + + /* skip NULL destination buffer */ + if (setting_pointers[setting_i] == NULL) { + break; + } + + /* advance to end of name in string */ + do { + line_buffer++; + } while (*line_buffer != 0 && *line_buffer != '='); + + if (*line_buffer == 0 || *(line_buffer+1) == 0) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "incomplete assignment in file") + } + line_buffer++; /* was pointing at '='; advance */ + + /* copy line buffer into out pointer */ + if (HDstrncpy( + setting_pointers[setting_i], + (const char *)line_buffer, + HDstrlen(line_buffer)) + == NULL) + { + HGOTO_ERROR(H5E_ARGS, H5E_CANTCOPY, FAIL, + "unable to copy line into pointer") + } + + /* "trim" tailing whitespace by replacing with null terminator*/ + buffer_i = 0; + while (!isspace(setting_pointers[setting_i][buffer_i])) { + buffer_i++; + } + setting_pointers[setting_i][buffer_i] = '\0'; + + break; /* have read setting; don't compare with others */ + } /* end if possible name match */ + } /* end for each setting name */ + } while (found_setting); + +done: + FUNC_LEAVE_NOAPI(ret_value); +} /* end H5FD__s3comms_load_aws_creds_from_file() */ + + +/*---------------------------------------------------------------------------- + * + * Function: H5FD_s3comms_load_aws_profile() + * + * Purpose : + * + * Read aws profile elements from standard location on system and store + * settings in memory. + * + * Looks for both `~/.aws/config` and `~/.aws/credentials`, the standard + * files for AWS tools. If a file exists (can be opened), looks for the + * given profile name and reads the settings into the relevant buffer. + * + * Any setting duplicated in both files will be set to that from + * `credentials`. + * + * Settings are stored in the supplied buffers as null-terminated strings. + * + * Return: + * + * + SUCCESS: `SUCCEED` (0) + * + no error occurred and all settings were populated + * + FAILURE: `FAIL` (-1) + * + internal error occurred + * + unable to locate profile + * + region, key id, and secret key were not all found and set + * + * Programmer: Jacob Smith + * 2018-02-27 + * + *---------------------------------------------------------------------------- + */ +herr_t +H5FD_s3comms_load_aws_profile(const char *profile_name, + char *key_id_out, + char *secret_access_key_out, + char *aws_region_out) +{ + herr_t ret_value = SUCCEED; + FILE *credfile = NULL; + char awspath[117]; + char filepath[128]; + int ret = 0; + + FUNC_ENTER_NOAPI_NOINIT + +#if S3COMMS_DEBUG + HDfprintf(stdout, "called H5FD_s3comms_load_aws_profile.\n"); +#endif + +#ifdef H5_HAVE_WIN32_API + ret = HDsnprintf(awspath, 117, "%s/.aws/", getenv("USERPROFILE")) ; +#else + ret = HDsnprintf(awspath, 117, "%s/.aws/", getenv("HOME")) ; +#endif + if (ret < 0 || (size_t)ret >= 117) { + HGOTO_ERROR(H5E_ARGS, H5E_CANTCOPY, FAIL, + "unable to format home-aws path") + } + ret = HDsnprintf(filepath, 128, "%s%s", awspath, "credentials"); + if (ret < 0 || (size_t)ret >= 128) { + HGOTO_ERROR(H5E_ARGS, H5E_CANTCOPY, FAIL, + "unable to format credentials path") + } + + credfile = fopen(filepath, "r"); + if (credfile != NULL) { + if (H5FD__s3comms_load_aws_creds_from_file( + credfile, + profile_name, + key_id_out, + secret_access_key_out, + aws_region_out) + == FAIL) + { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "unable to load from aws credentials") + } + if (fclose(credfile) == EOF) { + HGOTO_ERROR(H5E_FILE, H5E_CANTCLOSEFILE, FAIL, + "unable to close credentials file") + } + credfile = NULL; + } /* end if credential file opened */ + + ret = HDsnprintf(filepath, 128, "%s%s", awspath, "config"); + if (ret < 0 || (size_t)ret >= 128) { + HGOTO_ERROR(H5E_ARGS, H5E_CANTCOPY, FAIL, + "unable to format config path") + } + credfile = fopen(filepath, "r"); + if (credfile != NULL) { + if (H5FD__s3comms_load_aws_creds_from_file( + credfile, + profile_name, + (*key_id_out == 0) ? key_id_out : NULL, + (*secret_access_key_out == 0) ? secret_access_key_out : NULL, + (*aws_region_out == 0) ? aws_region_out : NULL) + == FAIL) + { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "unable to load from aws config") + } + if (fclose(credfile) == EOF) { + HGOTO_ERROR(H5E_FILE, H5E_CANTCLOSEFILE, FAIL, + "unable to close config file") + } + credfile = NULL; + } /* end if credential file opened */ + + /* fail if not all three settings were loaded */ + if (*key_id_out == 0 || + *secret_access_key_out == 0 || + *aws_region_out == 0) + { + ret_value = FAIL; + } + +done: + if (credfile != NULL) { + if (fclose(credfile) == EOF) { + HDONE_ERROR(H5E_ARGS, H5E_ARGS, FAIL, + "problem error-closing aws configuration file") + } + } + FUNC_LEAVE_NOAPI(ret_value); +} /* end H5FD_s3comms_load_aws_profile() */ + + +/*---------------------------------------------------------------------------- + * + * Function: H5FD_s3comms_nlowercase() + * + * Purpose: + * + * From string starting at `s`, write `len` characters to `dest`, + * converting all to lowercase. + * + * Behavior is undefined if `s` is NULL or `len` overruns the allocated + * space of either `s` or `dest`. + * + * Provided as convenience. + * + * Return: + * + * - SUCCESS: `SUCCEED` + * - upon completion, `dest` is populated + * - FAILURE: `FAIL` + * - `dest == NULL` + * + * Programmer: Jacob Smith + * 2017-09-18 + * + *---------------------------------------------------------------------------- + */ +herr_t +H5FD_s3comms_nlowercase( + char *dest, + const char *s, + size_t len) +{ + herr_t ret_value = SUCCEED; + + FUNC_ENTER_NOAPI_NOINIT + +#if S3COMMS_DEBUG + HDfprintf(stdout, "called H5FD_s3comms_nlowercase.\n"); +#endif + + if (dest == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "destination cannot be null.\n"); + } + + if (len > 0) { + HDmemcpy(dest, s, len); + do { + len--; + dest[len] = (char)tolower( (int)dest[len] ); + } while (len > 0); + } + +done: + FUNC_LEAVE_NOAPI(ret_value); +} /* end H5FD_s3comms_nlowercase() */ + + +/*---------------------------------------------------------------------------- + * + * Function: H5FD_s3comms_parse_url() + * + * Purpose: + * + * Parse URL-like string and stuff URL components into + * `parsed_url` structure, if possible. + * + * Expects null-terminated string of format: + * SCHEME "://" HOST [":" PORT ] ["/" [ PATH ] ] ["?" QUERY] + * where SCHEME :: "[a-zA-Z/.-]+" + * PORT :: "[0-9]" + * + * Stores resulting structure in argument pointer `purl`, if successful, + * creating and populating new `parsed_url_t` structure pointer. + * Empty or absent elements are NULL in new purl structure. + * + * Return: + * + * - SUCCESS: `SUCCEED` + * - `purl` pointer is populated + * - FAILURE: `FAIL` + * - unable to parse + * - `purl` is unaltered (probably NULL) + * + * Programmer: Jacob Smith + * 2017-10-30 + * + *---------------------------------------------------------------------------- + */ +herr_t +H5FD_s3comms_parse_url( + const char *str, + parsed_url_t **_purl) +{ + parsed_url_t *purl = NULL; /* pointer to new structure */ + const char *tmpstr = NULL; /* working pointer in string */ + const char *curstr = str; /* "start" pointer in string */ + long int len = 0; /* substring length */ + long int urllen = 0; /* length of passed-in url string */ + unsigned int i = 0; + herr_t ret_value = FAIL; + + FUNC_ENTER_NOAPI_NOINIT; + +#if S3COMMS_DEBUG + HDprintf("called H5FD_s3comms_parse_url.\n"); +#endif + + if (str == NULL || *str == '\0') { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "invalid url string"); + } + + urllen = (long int)HDstrlen(str); + + purl = (parsed_url_t *)H5MM_malloc(sizeof(parsed_url_t)); + if (purl == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_CANTALLOC, FAIL, + "can't allocate space for parsed_url_t"); + } + purl->magic = S3COMMS_PARSED_URL_MAGIC; + purl->scheme = NULL; + purl->host = NULL; + purl->port = NULL; + purl->path = NULL; + purl->query = NULL; + + /*************** + * READ SCHEME * + ***************/ + + tmpstr = HDstrchr(curstr, ':'); + if (tmpstr == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "invalid SCHEME construction: probably not URL"); + } + len = tmpstr - curstr; + HDassert( (0 <= len) && (len < urllen) ); + + /* check for restrictions + */ + for (i = 0; i < len; i++) { + /* scheme = [a-zA-Z+-.]+ (terminated by ":") */ + if (!isalpha(curstr[i]) && + '+' != curstr[i] && + '-' != curstr[i] && + '.' != curstr[i]) + { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "invalid SCHEME construction"); + } + } + /* copy lowercased scheme to structure + */ + purl->scheme = (char *)H5MM_malloc(sizeof(char) * (size_t)(len + 1)); + if (purl->scheme == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_CANTALLOC, FAIL, + "can't allocate space for SCHEME"); + } + (void)HDstrncpy(purl->scheme, curstr, (size_t)len); + purl->scheme[len] = '\0'; + for ( i = 0; i < len; i++ ) { + purl->scheme[i] = (char)tolower(purl->scheme[i]); + } + + /* Skip "://" */ + tmpstr += 3; + curstr = tmpstr; + + /************* + * READ HOST * + *************/ + + if (*curstr == '[') { + /* IPv6 */ + while (']' != *tmpstr) { + if (tmpstr == 0) { /* end of string reached! */ + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "reached end of URL: incomplete IPv6 HOST"); + } + tmpstr++; + } + tmpstr++; + } /* end if (IPv6) */ + else { + while (0 != *tmpstr) { + if (':' == *tmpstr || + '/' == *tmpstr || + '?' == *tmpstr) + { + break; + } + tmpstr++; + } + } /* end else (IPv4) */ + len = tmpstr - curstr; + if (len == 0) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "HOST substring cannot be empty"); + } + else + if (len > urllen) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "problem with length of HOST substring"); + } + + /* copy host + */ + purl->host = (char *)H5MM_malloc(sizeof(char) * (size_t)(len + 1)); + if (purl->host == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_CANTALLOC, FAIL, + "can't allocate space for HOST"); + } + (void)HDstrncpy(purl->host, curstr, (size_t)len); + purl->host[len] = 0; + + /************* + * READ PORT * + *************/ + + if (':' == *tmpstr) { + tmpstr += 1; /* advance past ':' */ + curstr = tmpstr; + while ((0 != *tmpstr) && ('/' != *tmpstr) && ('?' != *tmpstr)) { + tmpstr++; + } + len = tmpstr - curstr; + if (len == 0) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "PORT element cannot be empty"); + } + else + if (len > urllen) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "problem with length of PORT substring"); + } + for (i = 0; i < len; i ++) { + if (!isdigit(curstr[i])) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "PORT is not a decimal string"); + } + } + + /* copy port + */ + purl->port = (char *)H5MM_malloc(sizeof(char) * (size_t)(len + 1)); + if (purl->port == NULL) { /* cannot malloc */ + HGOTO_ERROR(H5E_ARGS, H5E_CANTALLOC, FAIL, + "can't allocate space for PORT"); + } + (void)HDstrncpy(purl->port, curstr, (size_t)len); + purl->port[len] = 0; + } /* end if PORT element */ + + /************* + * READ PATH * + *************/ + + if ('/' == *tmpstr) { + /* advance past '/' */ + tmpstr += 1; + curstr = tmpstr; + + /* seek end of PATH + */ + while ((0 != *tmpstr) && ('?' != *tmpstr)) { + tmpstr++; + } + len = tmpstr - curstr; + if (len > urllen) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "problem with length of PATH substring"); + } + if (len > 0) { + purl->path = (char *)H5MM_malloc(sizeof(char) * (size_t)(len + 1)); + if (purl->path == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_CANTALLOC, FAIL, + "can't allocate space for PATH"); + } /* cannot malloc path pointer */ + (void)HDstrncpy(purl->path, curstr, (size_t)len); + purl->path[len] = 0; + } + } /* end if PATH element */ + + /************** + * READ QUERY * + **************/ + + if ('?' == *tmpstr) { + tmpstr += 1; + curstr = tmpstr; + while (0 != *tmpstr) { + tmpstr++; + } + len = tmpstr - curstr; + if (len == 0) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "QUERY cannot be empty"); + } else if (len > urllen) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "problem with length of QUERY substring"); + } + purl->query = (char *)H5MM_malloc(sizeof(char) * (size_t)(len + 1)); + if (purl->query == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_CANTALLOC, FAIL, + "can't allocate space for QUERY"); + } /* cannot malloc path pointer */ + (void)HDstrncpy(purl->query, curstr, (size_t)len); + purl->query[len] = 0; + } /* end if QUERY exists */ + + *_purl = purl; + ret_value = SUCCEED; + +done: + if (ret_value == FAIL) { + H5FD_s3comms_free_purl(purl); + } + FUNC_LEAVE_NOAPI(ret_value); +} /* end H5FD_s3comms_parse_url() */ + + +/*---------------------------------------------------------------------------- + * + * Function: H5FD_s3comms_percent_encode_char() + * + * Purpose: + * + * "Percent-encode" utf-8 character `c`, e.g., + * '$' -> "%24" + * 'ยข' -> "%C2%A2" + * + * `c` cannot be null. + * + * Does not (currently) accept multi-byte characters... + * limit to (?) u+00ff, well below upper bound for two-byte utf-8 encoding + * (u+0080..u+07ff). + * + * Writes output to `repr`. + * `repr` cannot be null. + * Assumes adequate space i `repr`... + * >>> char[4] or [7] for most characters, + * >>> [13] as theoretical maximum. + * + * Representation `repr` is null-terminated. + * + * Stores length of representation (without null terminator) at pointer + * `repr_len`. + * + * Return : SUCCEED/FAIL + * + * - SUCCESS: `SUCCEED` + * - percent-encoded representation written to `repr` + * - 'repr' is null-terminated + * - FAILURE: `FAIL` + * - `c` or `repr` was NULL + * + * Programmer: Jacob Smith + * + *---------------------------------------------------------------------------- + */ +herr_t +H5FD_s3comms_percent_encode_char( + char *repr, + const unsigned char c, + size_t *repr_len) +{ + unsigned int i = 0; + int chars_written = 0; + herr_t ret_value = SUCCEED; +#if S3COMMS_DEBUG + unsigned char s[2] = {c, 0}; + unsigned char hex[3] = {0, 0, 0}; +#endif + + FUNC_ENTER_NOAPI_NOINIT + +#if S3COMMS_DEBUG + HDfprintf(stdout, "called H5FD_s3comms_percent_encode_char.\n"); +#endif + + if (repr == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no destination `repr`.\n") + } + +#if S3COMMS_DEBUG + H5FD_s3comms_bytes_to_hex((char *)hex, s, 1, FALSE); + HDfprintf(stdout, " CHAR: \'%s\'\n", s); + HDfprintf(stdout, " CHAR-HEX: \"%s\"\n", hex); +#endif + + if (c <= (unsigned char)0x7f) { + /* character represented in a single "byte" + * and single percent-code + */ +#if S3COMMS_DEBUG + HDfprintf(stdout, " SINGLE-BYTE\n"); +#endif + *repr_len = 3; + chars_written = HDsnprintf(repr, 4, "%%%02X", c); + if (chars_written < 0) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "cannot write char %c", + c); + } + } /* end if single-byte unicode char */ + else { + /* multi-byte, multi-percent representation + */ + unsigned int acc = 0; /* byte accumulator */ + unsigned int k = 0; /* uint character representation */ + unsigned int stack_size = 0; + unsigned char stack[4] = {0, 0, 0, 0}; +#if S3COMMS_DEBUG + HDfprintf(stdout, " MULTI-BYTE\n"); +#endif + stack_size = 0; + k = (unsigned int)c; + *repr_len = 0; + do { + /* push number onto stack in six-bit slices + */ + acc = k; + acc >>= 6; /* cull least */ + acc <<= 6; /* six bits */ + stack[stack_size++] = (unsigned char)(k - acc); + k = acc >> 6; + } while (k > 0); + + /* `stack` now has two to four six-bit 'numbers' to be put into + * UTF-8 byte fields. + */ + +#if S3COMMS_DEBUG + HDfprintf(stdout, " STACK:\n {\n"); + for (i = 0; i < stack_size; i++) { + H5FD_s3comms_bytes_to_hex( + (char *)hex, + (&stack[i]), + 1, + FALSE); + hex[2] = 0; + HDfprintf(stdout, " %s,\n", hex); + } + HDfprintf(stdout, " }\n"); +#endif + + /**************** + * leading byte * + ****************/ + + /* prepend 11[1[1]]0 to first byte */ + /* 110xxxxx, 1110xxxx, or 11110xxx */ + acc = 0xC0; /* 0x11000000 */ + acc += (stack_size > 2) ? 0x20 : 0; /* 0x00100000 */ + acc += (stack_size > 3) ? 0x10 : 0; /* 0x00010000 */ + stack_size--; + chars_written = HDsnprintf( + repr, + 4, + "%%%02X", + (unsigned char)(acc + stack[stack_size])); + if (chars_written < 0) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "cannot write char %c", + c); + } + *repr_len += 3; + + /************************ + * continuation byte(s) * + ************************/ + + /* 10xxxxxx */ + for (i = 0; i < stack_size; i++) { + chars_written = HDsnprintf( + &repr[i*3 + 3], + 4, + "%%%02X", + (unsigned char)(0x80 + stack[stack_size - 1 - i])); + if (chars_written < 0) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "cannot write char %c", + c); + } + *repr_len += 3; + } /* end for each continuation byte */ + } /* end else (multi-byte) */ + + *(repr + *repr_len) = '\0'; + +done: + FUNC_LEAVE_NOAPI(ret_value); +} /* H5FD_s3comms_percent_encode_char */ + + +/*---------------------------------------------------------------------------- + * + * Function: H5FD_s3comms_signing_key() + * + * Purpose: + * + * Create AWS4 "Signing Key" from secret key, AWS region, and timestamp. + * + * Sequentially runs HMAC_SHA256 on strings in specified order, + * generating re-usable checksum (according to documentation, valid for + * 7 days from time given). + * + * `secret` is `access key id` for targeted service/bucket/resource. + * + * `iso8601now` must conform to format, yyyyMMDD'T'hhmmss'Z' + * e.g. "19690720T201740Z". + * + * `region` should be one of AWS service region names, e.g. "us-east-1". + * + * Hard-coded "service" algorithm requirement to "s3". + * + * Inputs must be null-terminated strings. + * + * Writes to `md` the raw byte data, length of `SHA256_DIGEST_LENGTH`. + * Programmer must ensure that `md` is appropriately allocated. + * + * Return: + * + * - SUCCESS: `SUCCEED` + * - raw byte data of signing key written to `md` + * - FAILURE: `FAIL` + * - if any input arguments was NULL + * + * Programmer: Jacob Smith + * 2017-07-13 + * + *---------------------------------------------------------------------------- + */ +herr_t +H5FD_s3comms_signing_key( + unsigned char *md, + const char *secret, + const char *region, + const char *iso8601now) +{ + char *AWS4_secret = NULL; + size_t AWS4_secret_len = 0; + unsigned char datekey[SHA256_DIGEST_LENGTH]; + unsigned char dateregionkey[SHA256_DIGEST_LENGTH]; + unsigned char dateregionservicekey[SHA256_DIGEST_LENGTH]; + int ret = 0; /* return value of HDsnprintf */ + herr_t ret_value = SUCCEED; + + FUNC_ENTER_NOAPI_NOINIT + +#if S3COMMS_DEBUG + HDfprintf(stdout, "called H5FD_s3comms_signing_key.\n"); +#endif + + if (md == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "Destination `md` cannot be NULL.\n") + } + if (secret == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "`secret` cannot be NULL.\n") + } + if (region == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "`region` cannot be NULL.\n") + } + if (iso8601now == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "`iso8601now` cannot be NULL.\n") + } + + AWS4_secret_len = 4 + HDstrlen(secret) + 1; + AWS4_secret = (char*)H5MM_malloc(sizeof(char *) * AWS4_secret_len); + if (AWS4_secret == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "Could not allocate space.\n") + } + + /* prepend "AWS4" to start of the secret key + */ + ret = HDsnprintf(AWS4_secret, AWS4_secret_len,"%s%s", "AWS4", secret); + if ((size_t)ret != (AWS4_secret_len - 1)) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "problem writing AWS4+secret `%s`", + secret); + } + + /* hash_func, key, len(key), msg, len(msg), digest_dest, digest_len_dest + * we know digest length, so ignore via NULL + */ + HMAC(EVP_sha256(), + (const unsigned char *)AWS4_secret, + (int)HDstrlen(AWS4_secret), + (const unsigned char*)iso8601now, + 8, /* 8 --> length of 8 --> "yyyyMMDD" */ + datekey, + NULL); + HMAC(EVP_sha256(), + (const unsigned char *)datekey, + SHA256_DIGEST_LENGTH, + (const unsigned char *)region, + HDstrlen(region), + dateregionkey, + NULL); + HMAC(EVP_sha256(), + (const unsigned char *)dateregionkey, + SHA256_DIGEST_LENGTH, + (const unsigned char *)"s3", + 2, + dateregionservicekey, + NULL); + HMAC(EVP_sha256(), + (const unsigned char *)dateregionservicekey, + SHA256_DIGEST_LENGTH, + (const unsigned char *)"aws4_request", + 12, + md, + NULL); + +done: + H5MM_xfree(AWS4_secret); + + FUNC_LEAVE_NOAPI(ret_value); +} /* end H5FD_s3comms_signing_key() */ + + +/*---------------------------------------------------------------------------- + * + * Function: H5FD_s3comms_tostringtosign() + * + * Purpose: + * + * Get AWS "String to Sign" from Canonical Request, timestamp, + * and AWS "region". + * + * Common between single request and "chunked upload", + * conforms to: + * "AWS4-HMAC-SHA256\n" + + * <ISO8601 date format> + "\n" + // yyyyMMDD'T'hhmmss'Z' + * <yyyyMMDD> + "/" + <AWS Region> + "/s3/aws4-request\n" + + * hex(SHA256(<CANONICAL-REQUEST>)) + * + * Inputs `creq` (canonical request string), `now` (ISO8601 format), + * and `region` (s3 region designator string) must all be + * null-terminated strings. + * + * Result is written to `dest` with null-terminator. + * It is left to programmer to ensure `dest` has adequate space. + * + * Return: + * + * - SUCCESS: `SUCCEED` + * - "string to sign" written to `dest` and null-terminated + * - FAILURE: `FAIL` + * - if any of the inputs are NULL + * - if an error is encountered while computing checksum + * + * Programmer: Jacob Smith + * 2017-07-?? + * + *---------------------------------------------------------------------------- + */ +herr_t +H5FD_s3comms_tostringtosign( + char *dest, + const char *req, + const char *now, + const char *region) +{ + unsigned char checksum[SHA256_DIGEST_LENGTH * 2 + 1]; + size_t d = 0; + char day[9]; + char hexsum[SHA256_DIGEST_LENGTH * 2 + 1]; + size_t i = 0; + int ret = 0; /* HDsnprintf return value */ + herr_t ret_value = SUCCEED; + char tmp[128]; + + FUNC_ENTER_NOAPI_NOINIT + +#if S3COMMS_DEBUG + HDfprintf(stdout, "called H5FD_s3comms_tostringtosign.\n"); +#endif + + if (dest == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "destination buffer cannot be null.\n") + } + if (req == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "canonical request cannot be null.\n") + } + if (now == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "Timestring cannot be NULL.\n") + } + if (region == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "Region cannot be NULL.\n") + } + + for (i = 0; i < 128; i++) { + tmp[i] = '\0'; + } + for (i = 0; i < SHA256_DIGEST_LENGTH * 2 + 1; i++) { + checksum[i] = '\0'; + hexsum[i] = '\0'; + } + HDstrncpy(day, now, 8); + day[8] = '\0'; + ret = HDsnprintf(tmp, 127, "%s/%s/s3/aws4_request", day, region); + if (ret <= 0 || ret >= 127) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "problem adding day and region to string") + } + + HDmemcpy((dest + d), "AWS4-HMAC-SHA256\n", 17); + d = 17; + + HDmemcpy((dest+d), now, HDstrlen(now)); + d += HDstrlen(now); + dest[d++] = '\n'; + + HDmemcpy((dest + d), tmp, HDstrlen(tmp)); + d += HDstrlen(tmp); + dest[d++] = '\n'; + + SHA256((const unsigned char *)req, + HDstrlen(req), + checksum); + + if (H5FD_s3comms_bytes_to_hex( + hexsum, + (const unsigned char *)checksum, + SHA256_DIGEST_LENGTH, + true) + == FAIL) + { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "could not create hex string"); + } + + for (i = 0; i < SHA256_DIGEST_LENGTH * 2; i++) { + dest[d++] = hexsum[i]; + } + + dest[d] = '\0'; + +done: + FUNC_LEAVE_NOAPI(ret_value) +} /* end H5ros3_tostringtosign() */ + + +/*---------------------------------------------------------------------------- + * + * Function: H5FD_s3comms_trim() + * + * Purpose: + * + * Remove all whitespace characters from start and end of a string `s` + * of length `s_len`, writing trimmed string copy to `dest`. + * Stores number of characters remaining at `n_written`. + * + * Destination for trimmed copy `dest` cannot be null. + * `dest` must have adequate space allocated for trimmed copy. + * If inadequate space, behavior is undefined, possibly resulting + * in segfault or overwrite of other data. + * + * If `s` is NULL or all whitespace, `dest` is untouched and `n_written` + * is set to 0. + * + * Return: + * + * - SUCCESS: `SUCCEED` + * - FAILURE: `FAIL` + * - `dest == NULL` + * + * Programmer: Jacob Smith + * 2017-09-18 + * + *---------------------------------------------------------------------------- + */ +herr_t +H5FD_s3comms_trim(char *dest, + char *s, + size_t s_len, + size_t *n_written) +{ + herr_t ret_value = SUCCEED; + + FUNC_ENTER_NOAPI_NOINIT + +#if S3COMMS_DEBUG + HDfprintf(stdout, "called H5FD_s3comms_trim.\n"); +#endif + + if (dest == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "destination cannot be null.") + } + if (s == NULL) { + s_len = 0; + } + + if (s_len > 0) { + /* Find first non-whitespace character from start; + * reduce total length per character. + */ + while ((s_len > 0) && + isspace((unsigned char)s[0]) && s_len > 0) + { + s++; + s_len--; + } + + /* Find first non-whitespace character from tail; + * reduce length per-character. + * If length is 0 already, there is no non-whitespace character. + */ + if (s_len > 0) { + do { + s_len--; + } while( isspace((unsigned char)s[s_len]) ); + s_len++; + + /* write output into dest + */ + HDmemcpy(dest, s, s_len); + } + } + + *n_written = s_len; + +done: + FUNC_LEAVE_NOAPI(ret_value) +} /* end H5FD_s3comms_trim() */ + + +/*---------------------------------------------------------------------------- + * + * Function: H5FD_s3comms_uriencode() + * + * Purpose: + * + * URIencode (percent-encode) every byte except "[a-zA-Z0-9]-._~". + * + * For each character in source string `_s` from `s[0]` to `s[s_len-1]`, + * writes to `dest` either the raw character or its percent-encoded + * equivalent. + * + * See `H5FD_s3comms_bytes_to_hex` for information on percent-encoding. + * + * Space (' ') character encoded as "%20" (not "+") + * + * Forward-slash ('/') encoded as "%2F" only when `encode_slash == true`. + * + * Records number of characters written at `n_written`. + * + * Assumes that `dest` has been allocated with enough space. + * + * Neither `dest` nor `s` can be NULL. + * + * `s_len == 0` will have no effect. + * + * Return: + * + * - SUCCESS: `SUCCEED` + * - FAILURE: `FAIL` + * - source strings `s` or destination `dest` are NULL + * - error while attempting to percent-encode a character + * + * Programmer: Jacob Smith + * 2017-07-?? + * + *---------------------------------------------------------------------------- + */ +herr_t +H5FD_s3comms_uriencode( + char *dest, + const char *s, + size_t s_len, + hbool_t encode_slash, + size_t *n_written) +{ + char c = 0; + size_t dest_off = 0; + char hex_buffer[13]; + size_t hex_off = 0; + size_t hex_len = 0; + herr_t ret_value = SUCCEED; + size_t s_off = 0; + + FUNC_ENTER_NOAPI_NOINIT + +#if S3COMMS_DEBUG + HDfprintf(stdout, "H5FD_s3comms_uriencode called.\n"); +#endif + + if (s == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "source string cannot be NULL"); + } + if (dest == NULL) { + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "destination cannot be NULL"); + } + + /* Write characters to destination, converting to percent-encoded + * "hex-utf-8" strings if necessary. + * e.g., '$' -> "%24" + */ + for (s_off = 0; s_off < s_len; s_off++) { + c = s[s_off]; + if (isalnum(c) || + c == '.' || + c == '-' || + c == '_' || + c == '~' || + (c == '/' && encode_slash == FALSE)) + { + dest[dest_off++] = c; + } + else { + hex_off = 0; + if (H5FD_s3comms_percent_encode_char( + hex_buffer, + (const unsigned char)c, + &hex_len) + == FAIL) + { + hex_buffer[0] = c; + hex_buffer[1] = 0; + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "unable to percent-encode character \'%s\' " + "at %d in \"%s\"", hex_buffer, (int)s_off, s); + } + + for (hex_off = 0; hex_off < hex_len; hex_off++) { + dest[dest_off++] = hex_buffer[hex_off]; + } + } /* end else (not a regular character) */ + } /* end for each character */ + + if (dest_off < s_len) + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, + "buffer overflow"); + + *n_written = dest_off; + +done: + FUNC_LEAVE_NOAPI(ret_value) +} /* H5FD_s3comms_uriencode */ + +#endif /* H5_HAVE_ROS3_VFD */ + |