Magisk/jni/magiskhide/util.c

92 lines
1.9 KiB
C
Raw Normal View History

2016-12-30 19:44:24 +01:00
#include "magiskhide.h"
char **file_to_str_arr(FILE *fp, int *size) {
int allocated = 16;
char *line = NULL, **array;
size_t len = 0;
ssize_t read;
array = (char **) malloc(sizeof(char*) * allocated);
*size = 0;
while ((read = getline(&line, &len, fp)) != -1) {
if (*size >= allocated) {
// Double our allocation and re-allocate
allocated *= 2;
array = (char **) realloc(array, sizeof(char*) * allocated);
}
// Remove end newline
if (line[read - 1] == '\n') {
line[read - 1] = '\0';
}
array[*size] = line;
line = NULL;
++(*size);
}
return array;
}
void read_namespace(const int pid, char* target, const size_t size) {
char path[32];
snprintf(path, sizeof(path), "/proc/%d/ns/mnt", pid);
ssize_t len = readlink(path, target, size);
target[len] = '\0';
}
void lazy_unmount(const char* mountpoint) {
if (umount2(mountpoint, MNT_DETACH) != -1)
fprintf(logfile, "MagiskHide: Unmounted (%s)\n", mountpoint);
else
fprintf(logfile, "MagiskHide: Unmount Failed (%s)\n", mountpoint);
}
void run_as_daemon() {
switch(fork()) {
case -1:
exit(-1);
case 0:
if (setsid() < 0)
exit(-1);
close(STDIN_FILENO);
close(STDOUT_FILENO);
close(STDERR_FILENO);
logfile = fopen(LOGFILE, "a+");
setbuf(logfile, NULL);
break;
default:
exit(0);
}
}
void manage_selinux() {
char *argv[] = { SEPOLICY_INJECT, "--live", "permissive *", NULL };
char str[20];
int fd, ret;
fd = open(ENFORCE_FILE, O_RDONLY);
if (fd < 0)
return;
ret = read(fd, str, 20);
close(fd);
if (ret < 1)
return;
// Permissive
if (str[0] == '0') {
fprintf(logfile, "MagiskHide: Permissive detected, switching to pseudo enforced\n");
fd = open(ENFORCE_FILE, O_RDWR);
if (fd < 0)
return;
ret = write(fd, "1", 1);
close(fd);
if (ret < 1)
return;
switch(fork()) {
case -1:
return;
case 0:
execvp(argv[0], argv);
default:
return;
}
}
}