53 lines
1.1 KiB
C
53 lines
1.1 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <time.h>
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#define BLOCK_SIZE 1
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int main(int argc, char **argv){
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int fd, fd1;
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ssize_t read_bytes, wrote_bytes;
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char buf[BLOCK_SIZE];
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char *name;
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if (argc != 2){
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printf("Usage : %s <path_to_the_file_to_erase>", argv[0]);
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exit(EXIT_FAILURE);
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}
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struct stat sb;
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if (stat(argv[1], &sb) == -1){
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perror("stat");
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exit(EXIT_FAILURE);
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}
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if (sb.st_nlink > (nlink_t) 1) {
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unlink(argv[1]);
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exit(EXIT_FAILURE);
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}
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else {
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fd = open(argv[1], O_SYNC|O_RDONLY);
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if (fd == -1){
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perror("fd");
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exit(EXIT_SUCCESS);
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}
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while (read_bytes = read(fd,buf,BLOCK_SIZE) > 0) {
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wrote_bytes = write(fd,"0xff",BLOCK_SIZE);
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}
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fd1 = open("/dev/urandom", O_RDONLY);
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while (read(fd, buf, BLOCK_SIZE) > 0) {
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read_bytes = read(fd1, buf, BLOCK_SIZE);
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wrote_bytes = write(fd, buf, BLOCK_SIZE);
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}
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srand(time(NULL));
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name = "file" + (char) rand() + ".crypt";
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rename(argv[1], name);
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unlink(name);
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}
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close(fd);
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close(fd1);
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return EXIT_SUCCESS;
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}
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