Merge pull request #253 from s3fs-fuse/fixmkdirp

Added chacking cache dir perms at starting.

src/fdcache.cpp

@@ -66,7 +66,11 @@ bool CacheFileStat::MakeCacheFileStatPath(const char* path, string& sfile_path,
   top_path       += ".stat";
 
   if(is_create_dir){
-    mkdirp(top_path + mydirname(path), 0777);
+    int result;
+    if(0 != (result = mkdirp(top_path + mydirname(path), 0777))){
+      DPRNINFO("failed to create dir(%s) by errno(%d).", path, result);
+      return false;
+    }
   }
   if(!path || '\0' == path[0]){
     sfile_path = top_path;
@@ -76,6 +80,20 @@ bool CacheFileStat::MakeCacheFileStatPath(const char* path, string& sfile_path,
   return true;
 }
 
+bool CacheFileStat::CheckCacheFileStatTopDir(void)
+{
+  if(!FdManager::IsCacheDir()){
+    return true;
+  }
+  // make stat dir top path( "/<cache_dir>/.<bucket_name>.stat" )
+  string top_path = FdManager::GetCacheDir();
+  top_path       += "/.";
+  top_path       += bucket;
+  top_path       += ".stat";
+
+  return check_exist_dir_permission(top_path.c_str());
+}
+
 bool CacheFileStat::DeleteCacheFileStat(const char* path)
 {
   if(!path || '\0' == path[0]){
@@ -1095,7 +1113,11 @@ bool FdManager::MakeCachePath(const char* path, string& cache_path, bool is_crea
   }
   string resolved_path(FdManager::cache_dir + "/" + bucket);
   if(is_create_dir){
-    mkdirp(resolved_path + mydirname(path), 0777);
+    int result;
+    if(0 != (result = mkdirp(resolved_path + mydirname(path), 0777))){
+      DPRNINFO("failed to create dir(%s) by errno(%d).", path, result);
+      return false;
+    }
   }
   if(!path || '\0' == path[0]){
     cache_path = resolved_path;
@@ -1105,6 +1127,16 @@ bool FdManager::MakeCachePath(const char* path, string& cache_path, bool is_crea
   return true;
 }
 
+bool FdManager::CheckCacheTopDir(void)
+{
+  if(0 == FdManager::cache_dir.size()){
+    return true;
+  }
+  string toppath(FdManager::cache_dir + "/" + bucket);
+
+  return check_exist_dir_permission(toppath.c_str());
+}
+
 bool FdManager::MakeRandomTempPath(const char* path, string& tmppath)
 {
   char szBuff[64];

src/fdcache.h

@@ -34,6 +34,7 @@ class CacheFileStat
 
   public:
     static bool DeleteCacheFileStat(const char* path);
+    static bool CheckCacheFileStatTopDir(void);
 
     explicit CacheFileStat(const char* tpath = NULL);
     ~CacheFileStat();
@@ -166,6 +167,7 @@ class FdManager
     static size_t SetPageSize(size_t size);
     static size_t GetPageSize(void) { return FdManager::page_size; }
     static bool MakeCachePath(const char* path, std::string& cache_path, bool is_create_dir = true);
+    static bool CheckCacheTopDir(void);
     static bool MakeRandomTempPath(const char* path, std::string& tmppath);
 
     FdEntity* GetFdEntity(const char* path, int existfd = -1);

src/s3fs.cpp

@@ -4622,6 +4622,13 @@ int main(int argc, char* argv[])
     // like checking for appropriate lengths and characters  
   }
 
+  // check cache dir permission
+  if(!FdManager::CheckCacheTopDir() || !CacheFileStat::CheckCacheFileStatTopDir()){
+    fprintf(stderr, "%s: could not allow cache directory permission, check permission of cache directories.\n",
+      program_name.c_str());
+    exit(EXIT_FAILURE);
+  }
+
   // There's room for more command line error checking
 
   // Check to see if the bucket name contains periods and https (SSL) is

src/s3fs_util.cpp

@@ -546,15 +546,71 @@ string mybasename(string path)
 // mkdir --parents
 int mkdirp(const string& path, mode_t mode)
 {
-  string base;
-  string component;
+  string       base;
+  string       component;
   stringstream ss(path);
-  int result = 0;
   while (getline(ss, component, '/')) {
     base += "/" + component;
-    result = mkdir(base.c_str(), mode);
+
+    struct stat st;
+    if(0 == stat(base.c_str(), &st)){
+      if(!S_ISDIR(st.st_mode)){
+        return EPERM;
+      }
+    }else{
+      if(0 != mkdir(base.c_str(), mode)){
+        return errno;
+     }
+    }
   }
-  return result;
+  return 0;
+}
+
+bool check_exist_dir_permission(const char* dirpath)
+{
+  if(!dirpath || '\0' == dirpath[0]){
+    return false;
+  }
+
+  // exists
+  struct stat st;
+  if(0 != stat(dirpath, &st)){
+    if(ENOENT == errno){
+      // dir does not exitst
+      return true;
+    }
+    if(EACCES == errno){
+      // could not access directory
+      return false;
+    }
+    // somthing error occured
+    return false;
+  }
+
+  // check type
+  if(!S_ISDIR(st.st_mode)){
+    // path is not directory
+    return false;
+  }
+
+  // check permission
+  uid_t myuid = geteuid();
+  if(myuid == st.st_uid){
+    if(S_IRWXU != (st.st_mode & S_IRWXU)){
+      return false;
+    }
+  }else{
+    if(1 == is_uid_inculde_group(myuid, st.st_gid)){
+      if(S_IRWXG != (st.st_mode & S_IRWXG)){
+        return false;
+      }
+    }else{
+      if(S_IRWXO != (st.st_mode & S_IRWXO)){
+        return false;
+      }
+    }
+  }
+  return true;
 }
 
 bool delete_files_in_dir(const char* dir, bool is_remove_own)

src/s3fs_util.h

@@ -109,6 +109,7 @@ int is_uid_inculde_group(uid_t uid, gid_t gid);
 std::string mydirname(std::string path);
 std::string mybasename(std::string path);
 int mkdirp(const std::string& path, mode_t mode);
+bool check_exist_dir_permission(const char* dirpath);
 bool delete_files_in_dir(const char* dir, bool is_remove_own);
 
 time_t get_mtime(const char *s);