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#define _GNU_SOURCE
#include "encryption.h"
#include "shared.h"
#include <sodium.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdarg.h>
#include <unistd.h>
#include <errno.h>
#include <error.h>
#include <fcntl.h>
#include <stdio.h>
int checkSodium(void) {
int ret = sodium_init();
if(ret < 0)
error(1, ENOTSUP, "Couldn't initialize sodium for some reason. Quitting...");
return ret;
}
// To encrypt:
// 1- Create a temp file with the correct name in the root folder of the partition being encrypted
// 1.1- Detect the partition and find the root folder
// 1.2- Create the temp file with the correct name
// 2- Encrypt the file's contents to the temp file
// 2.1- Open the file
// 2.2- Stream the file's contents into some encryption algo
// 2.3- Pipe the output of the encryption into the temp file
// 3- Once the file has been encrypted, hard link it back to the original location
// 4- Delete the original file
// 5- Delete the temp file
int maketmp(const char *dest) {
int fd = open(dest, (O_TMPFILE | O_WRONLY | O_CLOEXEC | O_SYNC), (S_IRUSR | S_IWUSR));
if(fd < 0)
error(1, errno, "Couldn't open temp file at %s", dest);
return fd;
}
#include <string.h>
int main(void) {
const char *testmsg = "we do a little testing\n";
int fd = maketmp(".");
if(write(fd, testmsg, strlen(testmsg)) < 0)
error(1, errno, "write broke");
// if(linkat(fd, "", AT_FDCWD, "kys/now", AT_EMPTY_PATH) < 0)
// error(1, errno, "linkat broke");
char *path = NULL;
asprintf(&path, "/proc/self/fd/%d", fd);
linkat(AT_FDCWD, path, AT_FDCWD, "./test", AT_SYMLINK_FOLLOW);
// Apparently, I don't have the CAP_DAC_READ_SEARCH capibility. Thanks for the solution, linux man pages
if(close(fd) < 0)
error(1, errno, "close broke");
return 0;
}
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