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/*************************************************
* Unix EntropySource Source File *
* (C) 1999-2008 Jack Lloyd *
*************************************************/
#include <botan/es_unix.h>
#include <botan/unix_cmd.h>
#include <botan/parsing.h>
#include <botan/xor_buf.h>
#include <algorithm>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/resource.h>
#include <unistd.h>
namespace Botan {
namespace {
/*************************************************
* Sort ordering by priority *
*************************************************/
bool Unix_Program_Cmp(const Unix_Program& a, const Unix_Program& b)
{ return (a.priority < b.priority); }
}
/*************************************************
* Unix_EntropySource Constructor *
*************************************************/
Unix_EntropySource::Unix_EntropySource(const std::vector<std::string>& path) :
PATH(path)
{
add_default_sources(sources);
}
/*************************************************
* Add sources to the list *
*************************************************/
void Unix_EntropySource::add_sources(const Unix_Program srcs[], u32bit count)
{
sources.insert(sources.end(), srcs, srcs + count);
std::sort(sources.begin(), sources.end(), Unix_Program_Cmp);
}
/*************************************************
* Unix Fast Poll *
*************************************************/
u32bit Unix_EntropySource::fast_poll(byte buf[], u32bit length)
{
if(length == 0)
return 0;
length = std::min<u32bit>(length, 32);
u32bit buf_i = 0;
const char* stat_targets[] = {
"/",
"/tmp",
"/var/tmp",
"/usr",
"/home",
"/etc/passwd",
".",
"..",
0 };
for(u32bit j = 0; stat_targets[j]; j++)
{
struct stat statbuf;
::stat(stat_targets[j], &statbuf);
buf_i = xor_into_buf(buf, buf_i, length, statbuf);
}
u32bit ids[] = {
::getpid(),
::getppid(),
::getuid(),
::geteuid(),
::getegid(),
::getpgrp(),
::getsid(0)
};
for(u32bit i = 0; i != sizeof(ids) / sizeof(ids[0]); ++i)
buf_i = xor_into_buf(buf, buf_i, length, ids[i]);
struct ::rusage usage;
::getrusage(RUSAGE_SELF, &usage);
buf_i = xor_into_buf(buf, buf_i, length, usage);
::getrusage(RUSAGE_CHILDREN, &usage);
buf_i = xor_into_buf(buf, buf_i, length, usage);
return length;
}
/*************************************************
* Unix Slow Poll *
*************************************************/
u32bit Unix_EntropySource::slow_poll(byte buf[], u32bit length)
{
if(length == 0)
return 0;
const u32bit MINIMAL_WORKING = 32;
u32bit total_got = 0;
u32bit buf_i = 0;
for(u32bit j = 0; j != sources.size(); j++)
{
DataSource_Command pipe(sources[j].name_and_args, PATH);
SecureVector<byte> buffer(DEFAULT_BUFFERSIZE);
u32bit got_from_src = 0;
while(!pipe.end_of_data())
{
u32bit this_loop = pipe.read(buffer, buffer.size());
buf_i = xor_into_buf(buf, buf_i, length, buffer, this_loop);
got_from_src += this_loop;
}
sources[j].working = (got_from_src >= MINIMAL_WORKING) ? true : false;
total_got += got_from_src;
if(total_got >= 128*length)
break;
}
return length;
}
}
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