Line data    Source code

       1             : #ifndef HEADER_fd_src_discof_genesis_genesis_hash_h
       2             : #define HEADER_fd_src_discof_genesis_genesis_hash_h
       3             : 
       4             : #include "../../ballet/sha256/fd_sha256.h"
       5             : 
       6             : #include <errno.h>
       7             : #include <fcntl.h>
       8             : #include <unistd.h>
       9             : 
      10             : static inline ushort
      11             : compute_shred_version( uchar const            genesis_hash[ 32 ],
      12             :                        fd_hard_fork_t const * hard_forks,
      13           0 :                        ulong                  hard_fork_cnt ) {
      14           0 :   union {
      15           0 :     uchar  c[ 32 ];
      16           0 :     ushort s[ 16 ];
      17           0 :   } running_hash;
      18           0 :   fd_memcpy( running_hash.c, genesis_hash, 32UL );
      19             : 
      20           0 :   for( ulong i=0UL; i<hard_fork_cnt; i++ ) {
      21           0 :     ulong slot  = hard_forks[ i ].slot;
      22           0 :     ulong count = hard_forks[ i ].cnt;
      23             : 
      24           0 :     uchar data[ 48UL ];
      25           0 :     fd_memcpy( data, running_hash.c, 32UL );
      26           0 :     fd_memcpy( data+32UL, &slot, sizeof(ulong) );
      27           0 :     fd_memcpy( data+40UL, &count, sizeof(ulong) );
      28           0 :     FD_TEST( fd_sha256_hash( data, 48UL, running_hash.c ) );
      29           0 :   }
      30             : 
      31           0 :   ushort xor = 0;
      32           0 :   for( ulong i=0UL; i<16UL; i++ ) xor ^= running_hash.s[ i ];
      33             : 
      34           0 :   xor = fd_ushort_bswap( xor );
      35           0 :   xor = fd_ushort_if( xor<USHORT_MAX, (ushort)(xor + 1), USHORT_MAX );
      36             : 
      37           0 :   return xor;
      38           0 : }
      39             : 
      40             : static inline int
      41             : read_genesis_bin( char const * genesis_path,
      42             :                   ushort *     opt_shred_version,
      43           0 :                   uchar *      opt_gen_hash  ) {
      44             : 
      45           0 :   fd_sha256_t _sha[ 1 ];  fd_sha256_t * sha = fd_sha256_join( fd_sha256_new( _sha ) );
      46           0 :   fd_sha256_init( sha );
      47           0 :   uchar buffer[ 4096 ];
      48             : 
      49           0 :   int fd = open( genesis_path, O_RDONLY );
      50           0 :   if( FD_UNLIKELY( -1==fd ) ) return -1;
      51             : 
      52           0 :   for(;;) {
      53           0 :     long result = read( fd, buffer, sizeof(buffer) );
      54           0 :     if( FD_UNLIKELY( -1==result ) ) {
      55           0 :       if( FD_UNLIKELY( -1==close( fd ) ) ) FD_LOG_ERR(( "close failed `%s` (%i-%s)", genesis_path, errno, fd_io_strerror( errno ) ));
      56           0 :       return -1;
      57           0 :     } else if( FD_UNLIKELY( !result ) ) break;
      58             : 
      59           0 :     fd_sha256_append( sha, buffer, (ulong)result );
      60           0 :   }
      61             : 
      62           0 :   if( FD_UNLIKELY( -1==close( fd ) ) ) FD_LOG_ERR(( "close failed `%s` (%i-%s)", genesis_path, errno, fd_io_strerror( errno ) ));
      63             : 
      64           0 :   union {
      65           0 :     uchar  c[ 32 ];
      66           0 :     ushort s[ 16 ];
      67           0 :   } hash;
      68             : 
      69           0 :   fd_sha256_fini( sha, hash.c );
      70           0 :   fd_sha256_delete( fd_sha256_leave( sha ) );
      71             : 
      72           0 :   if( FD_LIKELY( opt_gen_hash ) ) memcpy( opt_gen_hash, hash.c, 32UL );
      73           0 :   if( FD_LIKELY( opt_shred_version ) ) *opt_shred_version = compute_shred_version( hash.c, NULL, 0UL );
      74             : 
      75           0 :   return 0;
      76           0 : }
      77             : 
      78             : #endif /* HEADER_fd_src_discof_genesis_genesis_hash_h */