1 /* 2 * The Initial Developer of the Original Code is International 3 * Business Machines Corporation. Portions created by IBM 4 * Corporation are Copyright (C) 2005 International Business 5 * Machines Corporation. All Rights Reserved. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the Common Public License as published by 9 * IBM Corporation; either version 1 of the License, or (at your option) 10 * any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * Common Public License for more details. 16 * 17 * You should have received a copy of the Common Public License 18 * along with this program; if not, a copy can be viewed at 19 * http://www.opensource.org/licenses/cpl1.0.php. 20 */ 21 #include <stdio.h> 22 #include <sys/types.h> 23 #include <sys/stat.h> 24 #include <fcntl.h> 25 #include <unistd.h> 26 #include <errno.h> 27 #include <string.h> 28 #include <netinet/in.h> 29 30 int main() { 31 32 char reset[] = { 33 0, 193, /* TPM_TAG_RQU_COMMAND */ 34 0, 0, 0, 10, /* length */ 35 0, 0, 0, 90 /* TPM_ORD_Reset */ 36 }; 37 38 int fd; 39 int err; 40 int rc = 1; 41 42 fd = open( "/dev/tpm0", O_RDWR ); 43 if ( fd < 0 ) { 44 printf( "Unable to open the device.\n" ); 45 goto out; 46 } 47 48 err = write( fd, reset, sizeof(reset) ); 49 50 if ( err != sizeof( reset ) ){ 51 printf( "Error occured while writing the reset command: %d\n", errno ); 52 goto out; 53 } 54 55 err = read( fd, reset, sizeof(reset) ); 56 if ( err != 10 ) { 57 printf( "Error occured while reading the reset result: %d %d %s\n", err, errno, strerror(errno)); 58 goto out; 59 } 60 61 err = ntohl( *((uint32_t *)(reset+6)) ); 62 if ( err == 38 ) { 63 printf( "TPM not started.\n" ); 64 goto out; 65 } 66 67 if ( err != 0 ) { 68 printf( "TPM Error occured: %d\n", err ); 69 goto out; 70 } 71 72 rc = 0; 73 printf( "Reset successful\n" ); 74 75 out: 76 close(fd); 77 return rc; 78 } 79 80