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-rw-r--r--src/eyetil.cc28
-rw-r--r--src/eyetil.h11
2 files changed, 39 insertions, 0 deletions
diff --git a/src/eyetil.cc b/src/eyetil.cc
index cd22eea..6ccc4ae 100644
--- a/src/eyetil.cc
+++ b/src/eyetil.cc
@@ -1,165 +1,193 @@
#include <stdlib.h>
#include <sys/stat.h>
#include <syslog.h>
#include <iostream>
#include <cassert>
#include <stdexcept>
#include <algorithm>
#include <numeric>
#include <openssl/md5.h>
#include "eyetil.h"
#include "config.h"
#ifdef HAVE_LIBUUID
# include <uuid/uuid.h>
#endif
binary_t& binary_t::from_hex(const std::string& h) {
std::string::size_type hs = h.length();
if(hs&1)
throw std::runtime_error("odd number of characters in hexadecimal number");
size_t rvs = hs>>1;
resize(rvs);
const unsigned char *hp = (const unsigned char*)h.data();
iterator oi=begin();
char t[3] = { 0,0,0 };
for(size_t i=0;i<rvs;++i) {
t[0]=*(hp++); t[1]=*(hp++);
*(oi++) = static_cast<binary_t::value_type>(0xff&strtol(t,0,16));
}
return *this;
}
binary_t& binary_t::from_data(const void *d,size_t s) {
resize(s);
std::copy((const unsigned char*)d,(const unsigned char *)d+s,
begin() );
return *this;
}
binary_t& binary_t::make_nonce() {
#ifdef HAVE_LIBUUID
uuid_t uuid;
uuid_generate(uuid);
from_data((unsigned char*)uuid,sizeof(uuid));
#else
resize(16);
std::generate_n(begin(),16,rand);
#endif /* HAVE_LIBUUID */
return *this;
}
std::string binary_t::hex() const {
std::string rv;
rv.reserve((size()<<1)+1);
char t[3] = {0,0,0};
for(const_iterator i=begin(),ie=end();i!=ie;++i) {
size_t rc = snprintf(t,sizeof(t),"%02x",*i);
assert(rc<sizeof(t));
rv += t;
}
return rv;
}
binary_t binary_t::md5() const {
binary_t rv(MD5_DIGEST_LENGTH);
if(!MD5(
(const unsigned char*)&(front()),size(),
(unsigned char*)&(rv.front()) ))
throw std::runtime_error("failed to md5()");
return rv;
}
void md5_digester::init() {
if(!MD5_Init(&ctx)) throw std::runtime_error("failed to MD5_Init()");
}
void md5_digester::update(const void *d,size_t l) {
if(!MD5_Update(&ctx,d,l)) throw std::runtime_error("failed to MD5_Update()");
}
binary_t md5_digester::final() {
binary_t rv(MD5_DIGEST_LENGTH);
if(!MD5_Final((unsigned char*)&(rv.front()), &ctx))
throw std::runtime_error("failed to MD5_Final()");
return rv;
}
uint16_t block512_t::tcpcksum(block512_t& data) {
uint32_t sum = std::accumulate(data.data,data.data+words,0);
while(uint32_t hw = sum>>16) sum = (sum&0xffff)+hw;
return 0xffff&~sum;
}
+void integrity_digester::update(const void *d_,size_t s) {
+ uint8_t *d=(uint8_t*)d_;
+ if(data_size) {
+ int l = sizeof(data)-data_size;
+ if(l>s) {
+ memmove(data.dptr(data_size),d,s); data_size+=s; return;
+ }
+ memmove(data.dptr(data_size),d,l); d+=l; s-=l;
+ md5.update<uint16_t>( data.tcpcksum(data) );
+ }
+ if(s<sizeof(data)) {
+ memmove(data.dptr(0),d,s); data_size=s; return;
+ }
+ size_t bb=s/sizeof(block512_t);
+ std::transform((block512_t*)d,((block512_t*)d)+bb,
+ md5.updater<uint16_t>(),block512_t::tcpcksum);
+ size_t ss=bb*sizeof(block512_t);
+ d+=ss; s-=ss;
+ assert(s<sizeof(block512_t));
+ if(s) memmove(data.dptr(0),d,data_size=s);
+}
+
+binary_t integrity_digester::final(const std::string& ukey) {
+ assert(!data_size);
+ md5.update( binary_t(ukey) );
+ return md5.final();
+}
+
static void make_path_for_template(const std::string& p,mode_t m) {
struct stat st;
std::string pp;
for(std::string::size_type sl=p.find('/',1);
sl!=std::string::npos;
sl=p.find('/',sl+1)) {
if(stat( (pp=p.substr(0,sl)).c_str() ,&st)
|| !S_ISDIR(st.st_mode)) {
if(mkdir(pp.c_str(),m))
throw std::runtime_error("failed to mkdir()");
}
}
}
tmpdir_t::tmpdir_t(const std::string& dt) : dir(dt) {
make_path_for_template(dt,0777);
if(!mkdtemp((char*)dir.data()))
throw std::runtime_error("failed to mkdtmp()");
}
tmpdir_t::~tmpdir_t() {
assert(!dir.empty());
if(rmdir(dir.c_str())) {
syslog(LOG_WARNING,"Failed to remove '%s' directory",dir.c_str());
}
}
std::string tmpdir_t::get_file(const std::string& f) {
std::string::size_type ls = f.rfind('/');
return dir+'/'+(
(ls==std::string::npos)
? f
: f.substr(ls+1)
);
}
tarchive_t::tarchive_t(void *p,size_t s) : a(archive_read_new()), e(0) {
if(!a) throw std::runtime_error("failed to archive_read_new()");
if(archive_read_support_format_tar(a)) {
archive_read_finish(a);
throw std::runtime_error("failed to archive_read_support_format_tar()");
}
if(archive_read_open_memory(a,p,s)) {
archive_read_finish(a);
throw std::runtime_error("failed to archive_read_open_memory()");
}
}
tarchive_t::~tarchive_t() {
assert(a);
archive_read_finish(a);
}
bool tarchive_t::read_next_header() {
assert(a);
return archive_read_next_header(a,&e)==ARCHIVE_OK;
}
std::string tarchive_t::entry_pathname() {
assert(a); assert(e);
return archive_entry_pathname(e);
}
bool tarchive_t::read_data_into_fd(int fd) {
assert(a);
return archive_read_data_into_fd(a,fd)==ARCHIVE_OK;
}
binary_t integrity_digest(const void *ptr,size_t size,const std::string& ukey) {
md5_digester rv;
std::transform( (block512_t*)ptr, ((block512_t*)ptr)+size/sizeof(block512_t),
rv.updater<uint16_t>(), block512_t::tcpcksum );
rv.update( binary_t(ukey) );
return rv.final();
}
diff --git a/src/eyetil.h b/src/eyetil.h
index 7517ba6..8784cb4 100644
--- a/src/eyetil.h
+++ b/src/eyetil.h
@@ -1,105 +1,116 @@
#ifndef __EYETIL_H
#define __EYETIL_H
#include <vector>
#include <string>
#include <archive.h>
#include <archive_entry.h>
#include "openssl/md5.h"
struct throwable_exit {
int rc;
throwable_exit(int rc_) : rc(rc_) { }
};
class binary_t : public std::vector<unsigned char> {
public:
binary_t() { }
binary_t(size_type n) : std::vector<unsigned char>(n) { }
binary_t(const std::string& h) { from_hex(h); }
binary_t(const void *d,size_t s) { from_data(d,s); }
binary_t& from_hex(const std::string& h);
binary_t& from_data(const void *d,size_t s);
binary_t& make_nonce();
std::string hex() const;
binary_t md5() const;
};
struct md5_digester {
MD5_CTX ctx;
md5_digester() { init(); }
void init();
void update(const void *d,size_t l);
binary_t final();
template<typename T>
void update(const T& x) { update(&x,sizeof(x)); }
template<typename T>
struct update_iterator : public std::iterator<std::output_iterator_tag,T,void,T*,T&> {
md5_digester *d;
update_iterator(md5_digester *d_) : d(d_) { }
update_iterator(const update_iterator& x) : d(x.d) { }
update_iterator& operator*() { return *this; }
update_iterator& operator++() { return *this; }
update_iterator& operator++(int) { return *this; }
update_iterator& operator=(const T& x) {
d->update(x); return *this;
}
};
template<typename T>
update_iterator<T> updater() {
return update_iterator<T>(this);
}
};
template<> inline void md5_digester::update<binary_t>(const binary_t& x) {
update((const unsigned char*)&(x.front()),x.size());
}
#pragma pack(1)
struct block512_t {
enum { words = 512 / sizeof(uint16_t) };
uint16_t data[words];
inline uint8_t *dptr(size_t o) { return ((uint8_t*)this)+o; }
static uint16_t tcpcksum(block512_t& data);
};
#pragma pack()
+struct integrity_digester {
+ md5_digester md5;
+ size_t data_size;
+ block512_t data;
+
+ integrity_digester() : data_size(0) { }
+ void update(const void *d,size_t s);
+ binary_t final(const std::string& ukey);
+};
+
+
class tmpdir_t {
public:
std::string dir;
tmpdir_t(const std::string& dt);
~tmpdir_t();
std::string get_file(const std::string& f);
};
class tarchive_t {
public:
struct archive *a;
struct archive_entry *e;
tarchive_t(void *p,size_t s);
~tarchive_t();
bool read_next_header();
std::string entry_pathname();
bool read_data_into_fd(int fd);
};
binary_t integrity_digest(const void *ptr,size_t size,
const std::string& ukey);
#endif /* __EYETIL_H */