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s3fs-fuse/src/s3fs_xml.cpp

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/*
* s3fs - FUSE-based file system backed by Amazon S3
*
* Copyright(C) 2007 Takeshi Nakatani <ggtakec.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.
*/
#include <cstdio>
#include <cstdlib>
#include <libxml/xpathInternals.h>
#include "common.h"
#include "s3fs.h"
#include "s3fs_logger.h"
#include "s3fs_xml.h"
#include "s3fs_util.h"
#include "s3objlist.h"
#include "autolock.h"
#include "string_util.h"
//-------------------------------------------------------------------
// Variables
//-------------------------------------------------------------------
static constexpr char c_strErrorObjectName[] = "FILE or SUBDIR in DIR";
// [NOTE]
// mutex for static variables in GetXmlNsUrl
//
static pthread_mutex_t* pxml_parser_mutex = nullptr;
//-------------------------------------------------------------------
// Functions
//-------------------------------------------------------------------
static bool GetXmlNsUrl(xmlDocPtr doc, std::string& nsurl)
{
bool result = false;
if(!pxml_parser_mutex || !doc){
return result;
}
std::string tmpNs;
{
static time_t tmLast = 0; // cache for 60 sec.
static std::string strNs;
AutoLock lock(pxml_parser_mutex);
if((tmLast + 60) < time(nullptr)){
// refresh
tmLast = time(nullptr);
strNs = "";
xmlNodePtr pRootNode = xmlDocGetRootElement(doc);
if(pRootNode){
std::unique_ptr<xmlNsPtr, decltype(xmlFree)> nslist(xmlGetNsList(doc, pRootNode), xmlFree);
if(nslist){
if(*nslist && (*nslist)[0].href){
int len = xmlStrlen((*nslist)[0].href);
if(0 < len){
strNs = std::string(reinterpret_cast<const char*>((*nslist)[0].href), len);
}
}
}
}
}
tmpNs = strNs;
}
if(!tmpNs.empty()){
nsurl = tmpNs;
result = true;
}
return result;
}
static unique_ptr_xmlChar get_base_exp(xmlDocPtr doc, const char* exp)
{
std::string xmlnsurl;
std::string exp_string;
if(!doc){
return {nullptr, xmlFree};
}
unique_ptr_xmlXPathContext ctx(xmlXPathNewContext(doc), xmlXPathFreeContext);
if(!noxmlns && GetXmlNsUrl(doc, xmlnsurl)){
xmlXPathRegisterNs(ctx.get(), reinterpret_cast<const xmlChar*>("s3"), reinterpret_cast<const xmlChar*>(xmlnsurl.c_str()));
exp_string = "/s3:ListBucketResult/s3:";
} else {
exp_string = "/ListBucketResult/";
}
exp_string += exp;
unique_ptr_xmlXPathObject marker_xp(xmlXPathEvalExpression(reinterpret_cast<const xmlChar*>(exp_string.c_str()), ctx.get()), xmlXPathFreeObject);
if(nullptr == marker_xp){
return {nullptr, xmlFree};
}
if(xmlXPathNodeSetIsEmpty(marker_xp->nodesetval)){
S3FS_PRN_INFO("marker_xp->nodesetval is empty.");
return {nullptr, xmlFree};
}
xmlNodeSetPtr nodes = marker_xp->nodesetval;
unique_ptr_xmlChar result(xmlNodeListGetString(doc, nodes->nodeTab[0]->xmlChildrenNode, 1), xmlFree);
return result;
}
static unique_ptr_xmlChar get_prefix(xmlDocPtr doc)
{
return get_base_exp(doc, "Prefix");
}
unique_ptr_xmlChar get_next_continuation_token(xmlDocPtr doc)
{
return get_base_exp(doc, "NextContinuationToken");
}
unique_ptr_xmlChar get_next_marker(xmlDocPtr doc)
{
return get_base_exp(doc, "NextMarker");
}
// return: the pointer to object name on allocated memory.
// the pointer to "c_strErrorObjectName".(not allocated)
// nullptr(a case of something error occurred)
static char* get_object_name(xmlDocPtr doc, xmlNodePtr node, const char* path)
{
// Get full path
unique_ptr_xmlChar fullpath(xmlNodeListGetString(doc, node, 1), xmlFree);
if(!fullpath){
S3FS_PRN_ERR("could not get object full path name..");
return nullptr;
}
// basepath(path) is as same as fullpath.
if(0 == strcmp(reinterpret_cast<char*>(fullpath.get()), path)){
return const_cast<char*>(c_strErrorObjectName);
}
// Make dir path and filename
std::string strdirpath = mydirname(reinterpret_cast<const char*>(fullpath.get()));
std::string strmybpath = mybasename(reinterpret_cast<const char*>(fullpath.get()));
const char* dirpath = strdirpath.c_str();
const char* mybname = strmybpath.c_str();
const char* basepath= (path && '/' == path[0]) ? &path[1] : path;
if('\0' == mybname[0]){
return nullptr;
}
// check subdir & file in subdir
if(0 < strlen(dirpath)){
// case of "/"
if(0 == strcmp(mybname, "/") && 0 == strcmp(dirpath, "/")){
return const_cast<char*>(c_strErrorObjectName);
}
// case of "."
if(0 == strcmp(mybname, ".") && 0 == strcmp(dirpath, ".")){
return const_cast<char *>(c_strErrorObjectName);
}
// case of ".."
if(0 == strcmp(mybname, "..") && 0 == strcmp(dirpath, ".")){
return const_cast<char *>(c_strErrorObjectName);
}
// case of "name"
if(0 == strcmp(dirpath, ".")){
// OK
return strdup(mybname);
}else{
if(basepath && 0 == strcmp(dirpath, basepath)){
// OK
return strdup(mybname);
}else if(basepath && 0 < strlen(basepath) && '/' == basepath[strlen(basepath) - 1] && 0 == strncmp(dirpath, basepath, strlen(basepath) - 1)){
std::string withdirname;
if(strlen(dirpath) > strlen(basepath)){
withdirname = &dirpath[strlen(basepath)];
}
// cppcheck-suppress unmatchedSuppression
// cppcheck-suppress knownConditionTrueFalse
if(!withdirname.empty() && '/' != *withdirname.rbegin()){
withdirname += "/";
}
withdirname += mybname;
return strdup(withdirname.c_str());
}
}
}
// case of something wrong
return const_cast<char*>(c_strErrorObjectName);
}
static unique_ptr_xmlChar get_exp_value_xml(xmlDocPtr doc, xmlXPathContextPtr ctx, const char* exp_key)
{
if(!doc || !ctx || !exp_key){
return {nullptr, xmlFree};
}
xmlNodeSetPtr exp_nodes;
// search exp_key tag
unique_ptr_xmlXPathObject exp(xmlXPathEvalExpression(reinterpret_cast<const xmlChar*>(exp_key), ctx), xmlXPathFreeObject);
if(nullptr == exp){
S3FS_PRN_ERR("Could not find key(%s).", exp_key);
return {nullptr, xmlFree};
}
if(xmlXPathNodeSetIsEmpty(exp->nodesetval)){
S3FS_PRN_ERR("Key(%s) node is empty.", exp_key);
return {nullptr, xmlFree};
}
// get exp_key value & set in struct
exp_nodes = exp->nodesetval;
unique_ptr_xmlChar exp_value(xmlNodeListGetString(doc, exp_nodes->nodeTab[0]->xmlChildrenNode, 1), xmlFree);
if(nullptr == exp_value){
S3FS_PRN_ERR("Key(%s) value is empty.", exp_key);
return {nullptr, xmlFree};
}
return exp_value;
}
bool get_incomp_mpu_list(xmlDocPtr doc, incomp_mpu_list_t& list)
{
if(!doc){
return false;
}
unique_ptr_xmlXPathContext ctx(xmlXPathNewContext(doc), xmlXPathFreeContext);
std::string xmlnsurl;
std::string ex_upload = "//";
std::string ex_key;
std::string ex_id;
std::string ex_date;
if(!noxmlns && GetXmlNsUrl(doc, xmlnsurl)){
xmlXPathRegisterNs(ctx.get(), reinterpret_cast<const xmlChar*>("s3"), reinterpret_cast<const xmlChar*>(xmlnsurl.c_str()));
ex_upload += "s3:";
ex_key += "s3:";
ex_id += "s3:";
ex_date += "s3:";
}
ex_upload += "Upload";
ex_key += "Key";
ex_id += "UploadId";
ex_date += "Initiated";
// get "Upload" Tags
unique_ptr_xmlXPathObject upload_xp(xmlXPathEvalExpression(reinterpret_cast<const xmlChar*>(ex_upload.c_str()), ctx.get()), xmlXPathFreeObject);
if(nullptr == upload_xp){
S3FS_PRN_ERR("xmlXPathEvalExpression returns null.");
return false;
}
if(xmlXPathNodeSetIsEmpty(upload_xp->nodesetval)){
S3FS_PRN_INFO("upload_xp->nodesetval is empty.");
return true;
}
// Make list
int cnt;
xmlNodeSetPtr upload_nodes;
list.clear();
for(cnt = 0, upload_nodes = upload_xp->nodesetval; cnt < upload_nodes->nodeNr; cnt++){
ctx->node = upload_nodes->nodeTab[cnt];
INCOMP_MPU_INFO part;
// search "Key" tag
unique_ptr_xmlChar ex_value(get_exp_value_xml(doc, ctx.get(), ex_key.c_str()));
if(nullptr == ex_value){
continue;
}
if('/' != *(reinterpret_cast<char*>(ex_value.get()))){
part.key = "/";
}else{
part.key = "";
}
part.key += reinterpret_cast<char*>(ex_value.get());
// search "UploadId" tag
if(nullptr == (ex_value = get_exp_value_xml(doc, ctx.get(), ex_id.c_str()))){
continue;
}
part.id = reinterpret_cast<char*>(ex_value.get());
// search "Initiated" tag
if(nullptr == (ex_value = get_exp_value_xml(doc, ctx.get(), ex_date.c_str()))){
continue;
}
part.date = reinterpret_cast<char*>(ex_value.get());
list.push_back(part);
}
return true;
}
bool is_truncated(xmlDocPtr doc)
{
unique_ptr_xmlChar strTruncate(get_base_exp(doc, "IsTruncated"));
if(!strTruncate){
return false;
}
return 0 == strcasecmp(reinterpret_cast<const char*>(strTruncate.get()), "true");
}
int append_objects_from_xml_ex(const char* path, xmlDocPtr doc, xmlXPathContextPtr ctx, const char* ex_contents, const char* ex_key, const char* ex_etag, int isCPrefix, S3ObjList& head, bool prefix)
{
xmlNodeSetPtr content_nodes;
unique_ptr_xmlXPathObject contents_xp(xmlXPathEvalExpression(reinterpret_cast<const xmlChar*>(ex_contents), ctx), xmlXPathFreeObject);
if(nullptr == contents_xp){
S3FS_PRN_ERR("xmlXPathEvalExpression returns null.");
return -1;
}
if(xmlXPathNodeSetIsEmpty(contents_xp->nodesetval)){
S3FS_PRN_DBG("contents_xp->nodesetval is empty.");
return 0;
}
content_nodes = contents_xp->nodesetval;
bool is_dir;
std::string stretag;
int i;
for(i = 0; i < content_nodes->nodeNr; i++){
ctx->node = content_nodes->nodeTab[i];
// object name
unique_ptr_xmlXPathObject key(xmlXPathEvalExpression(reinterpret_cast<const xmlChar*>(ex_key), ctx), xmlXPathFreeObject);
if(nullptr == key){
S3FS_PRN_WARN("key is null. but continue.");
continue;
}
if(xmlXPathNodeSetIsEmpty(key->nodesetval)){
S3FS_PRN_WARN("node is empty. but continue.");
continue;
}
xmlNodeSetPtr key_nodes = key->nodesetval;
char* name = get_object_name(doc, key_nodes->nodeTab[0]->xmlChildrenNode, path);
if(!name){
S3FS_PRN_WARN("name is something wrong. but continue.");
}else if(reinterpret_cast<const char*>(name) != c_strErrorObjectName){
is_dir = isCPrefix ? true : false;
stretag = "";
if(!isCPrefix && ex_etag){
// Get ETag
unique_ptr_xmlXPathObject ETag(xmlXPathEvalExpression(reinterpret_cast<const xmlChar*>(ex_etag), ctx), xmlXPathFreeObject);
if(nullptr != ETag){
if(xmlXPathNodeSetIsEmpty(ETag->nodesetval)){
S3FS_PRN_INFO("ETag->nodesetval is empty.");
}else{
xmlNodeSetPtr etag_nodes = ETag->nodesetval;
unique_ptr_xmlChar petag(xmlNodeListGetString(doc, etag_nodes->nodeTab[0]->xmlChildrenNode, 1), xmlFree);
if(petag){
stretag = reinterpret_cast<const char*>(petag.get());
}
}
}
}
// [NOTE]
// The XML data passed to this function is CR code(\r) encoded.
// The function below decodes that encoded CR code.
//
std::string decname = get_decoded_cr_code(name);
free(name);
if(prefix){
head.common_prefixes.push_back(decname);
}
if(!head.insert(decname.c_str(), (!stretag.empty() ? stretag.c_str() : nullptr), is_dir)){
S3FS_PRN_ERR("insert_object returns with error.");
return -1;
}
}else{
S3FS_PRN_DBG("name is file or subdir in dir. but continue.");
}
}
return 0;
}
int append_objects_from_xml(const char* path, xmlDocPtr doc, S3ObjList& head)
{
std::string xmlnsurl;
std::string ex_contents = "//";
std::string ex_key;
std::string ex_cprefix = "//";
std::string ex_prefix;
std::string ex_etag;
if(!doc){
return -1;
}
// If there is not <Prefix>, use path instead of it.
auto pprefix = get_prefix(doc);
std::string prefix = (pprefix ? reinterpret_cast<char*>(pprefix.get()) : path ? path : "");
unique_ptr_xmlXPathContext ctx(xmlXPathNewContext(doc), xmlXPathFreeContext);
if(!noxmlns && GetXmlNsUrl(doc, xmlnsurl)){
xmlXPathRegisterNs(ctx.get(), reinterpret_cast<const xmlChar*>("s3"), reinterpret_cast<const xmlChar*>(xmlnsurl.c_str()));
ex_contents+= "s3:";
ex_key += "s3:";
ex_cprefix += "s3:";
ex_prefix += "s3:";
ex_etag += "s3:";
}
ex_contents+= "Contents";
ex_key += "Key";
ex_cprefix += "CommonPrefixes";
ex_prefix += "Prefix";
ex_etag += "ETag";
if(-1 == append_objects_from_xml_ex(prefix.c_str(), doc, ctx.get(), ex_contents.c_str(), ex_key.c_str(), ex_etag.c_str(), 0, head, /*prefix=*/ false) ||
-1 == append_objects_from_xml_ex(prefix.c_str(), doc, ctx.get(), ex_cprefix.c_str(), ex_prefix.c_str(), nullptr, 1, head, /*prefix=*/ true) )
{
S3FS_PRN_ERR("append_objects_from_xml_ex returns with error.");
return -1;
}
return 0;
}
//-------------------------------------------------------------------
// Utility functions
//-------------------------------------------------------------------
bool simple_parse_xml(const char* data, size_t len, const char* key, std::string& value)
{
bool result = false;
if(!data || !key){
return false;
}
value.clear();
std::unique_ptr<xmlDoc, decltype(&xmlFreeDoc)> doc(xmlReadMemory(data, static_cast<int>(len), "", nullptr, 0), xmlFreeDoc);
if(nullptr == doc){
return false;
}
if(nullptr == doc->children){
return false;
}
for(xmlNodePtr cur_node = doc->children->children; nullptr != cur_node; cur_node = cur_node->next){
// For DEBUG
// std::string cur_node_name(reinterpret_cast<const char *>(cur_node->name));
// printf("cur_node_name: %s\n", cur_node_name.c_str());
if(XML_ELEMENT_NODE == cur_node->type){
std::string elementName = reinterpret_cast<const char*>(cur_node->name);
// For DEBUG
// printf("elementName: %s\n", elementName.c_str());
if(cur_node->children){
if(XML_TEXT_NODE == cur_node->children->type){
if(elementName == key) {
value = reinterpret_cast<const char *>(cur_node->children->content);
result = true;
break;
}
}
}
}
}
return result;
}
//-------------------------------------------------------------------
// Utility for lock
//-------------------------------------------------------------------
bool init_parser_xml_lock()
{
if(pxml_parser_mutex){
return false;
}
pxml_parser_mutex = new pthread_mutex_t;
pthread_mutexattr_t attr;
pthread_mutexattr_init(&attr);
#if S3FS_PTHREAD_ERRORCHECK
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK);
#endif
if(0 != pthread_mutex_init(pxml_parser_mutex, &attr)){
delete pxml_parser_mutex;
pxml_parser_mutex = nullptr;
return false;
}
return true;
}
bool destroy_parser_xml_lock()
{
if(!pxml_parser_mutex){
return false;
}
if(0 != pthread_mutex_destroy(pxml_parser_mutex)){
return false;
}
delete pxml_parser_mutex;
pxml_parser_mutex = nullptr;
return true;
}
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: expandtab sw=4 ts=4 fdm=marker
* vim<600: expandtab sw=4 ts=4
*/
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