1 files changed, 147 insertions, 0 deletions
diff --git a/modules/entropy/proc_walk/es_ftw.cpp b/modules/entropy/proc_walk/es_ftw.cpp
new file mode 100644
index 000000000..ec11378f8
--- /dev/null
+++ b/modules/entropy/proc_walk/es_ftw.cpp
@@ -0,0 +1,147 @@
+/*************************************************
+* FTW EntropySource Source File                  *
+* (C) 1999-2008 Jack Lloyd                       *
+*************************************************/
+
+#include <botan/es_ftw.h>
+#include <botan/util.h>
+#include <cstring>
+#include <deque>
+
+#ifndef _POSIX_C_SOURCE
+  #define _POSIX_C_SOURCE 199309
+#endif
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <dirent.h>
+#include <fcntl.h>
+
+namespace Botan {
+
+namespace {
+
+class Directory_Walker
+   {
+   public:
+      Directory_Walker(const std::string& root) { add_directory(root); }
+      ~Directory_Walker();
+
+      int next_fd();
+   private:
+      void add_directory(const std::string&);
+
+      std::deque<std::pair<DIR*, std::string> > dirs;
+   };
+
+void Directory_Walker::add_directory(const std::string& dirname)
+   {
+   DIR* dir = ::opendir(dirname.c_str());
+   if(dir)
+      dirs.push_back(std::make_pair(dir, dirname));
+   }
+
+Directory_Walker::~Directory_Walker()
+   {
+   while(dirs.size())
+      {
+      ::closedir(dirs[0].first);
+      dirs.pop_front();
+      }
+   }
+
+int Directory_Walker::next_fd()
+   {
+   while(dirs.size())
+      {
+      std::pair<DIR*, std::string> dirinfo = dirs[0];
+
+      struct dirent* entry = ::readdir(dirinfo.first);
+
+      if(!entry)
+         {
+         ::closedir(dirinfo.first);
+         dirs.pop_front();
+         continue;
+         }
+
+      const std::string filename = entry->d_name;
+
+      if(filename == "." || filename == "..")
+         continue;
+
+      const std::string full_path = dirinfo.second + '/' + filename;
+
+      struct stat stat_buf;
+      if(::lstat(full_path.c_str(), &stat_buf) == -1)
+         continue;
+
+      if(S_ISDIR(stat_buf.st_mode))
+         add_directory(full_path);
+      else if(S_ISREG(stat_buf.st_mode))
+         {
+         int fd = ::open(full_path.c_str(), O_RDONLY | O_NOCTTY);
+
+         if(fd > 0)
+            return fd;
+         }
+      }
+
+   return -1;
+   }
+
+}
+
+/*************************************************
+* FTW_EntropySource Constructor                  *
+*************************************************/
+FTW_EntropySource::FTW_EntropySource(const std::string& p) : path(p)
+   {
+   }
+
+/*************************************************
+* FTW Fast Poll                                  *
+*************************************************/
+void FTW_EntropySource::do_fast_poll()
+   {
+   poll(32*1024);
+   }
+
+/*************************************************
+* FTW Slow Poll                                  *
+*************************************************/
+void FTW_EntropySource::do_slow_poll()
+   {
+   poll(256*1024);
+   }
+
+/*************************************************
+* FTW Poll                                       *
+*************************************************/
+void FTW_EntropySource::poll(u32bit max_read)
+   {
+   Directory_Walker dir(path);
+   SecureVector<byte> read_buf(1024);
+
+   u32bit read_so_far = 0;
+   while(read_so_far < max_read)
+      {
+      int fd = dir.next_fd();
+
+      if(fd == -1)
+         break;
+
+      ssize_t got = ::read(fd, read_buf.begin(), read_buf.size());
+
+      if(got > 0)
+         {
+         add_bytes(read_buf, got);
+         read_so_far += got;
+         }
+
+      ::close(fd);
+      }
+   }
+
+}