mirror of
https://github.com/topjohnwu/Magisk.git
synced 2024-11-28 12:35:26 +00:00
68 lines
1.4 KiB
C
68 lines
1.4 KiB
C
/* misc.c - Miscellaneous stuffs for su
|
|
*/
|
|
|
|
#define _GNU_SOURCE
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <signal.h>
|
|
#include <unistd.h>
|
|
#include <sys/types.h>
|
|
#include <sys/wait.h>
|
|
|
|
#include "magisk.h"
|
|
#include "su.h"
|
|
|
|
int quit_signals[] = { SIGALRM, SIGABRT, SIGHUP, SIGPIPE, SIGQUIT, SIGTERM, SIGINT, 0 };
|
|
|
|
void setup_sighandlers(void (*handler)(int)) {
|
|
struct sigaction act;
|
|
|
|
// Install the termination handlers
|
|
// Note: we're assuming that none of these signal handlers are already trapped.
|
|
// If they are, we'll need to modify this code to save the previous handler and
|
|
// call it after we restore stdin to its previous state.
|
|
memset(&act, 0, sizeof(act));
|
|
act.sa_handler = handler;
|
|
for (int i = 0; quit_signals[i]; ++i) {
|
|
sigaction(quit_signals[i], &act, NULL);
|
|
}
|
|
}
|
|
|
|
void set_identity(unsigned uid) {
|
|
/*
|
|
* Set effective uid back to root, otherwise setres[ug]id will fail
|
|
* if uid isn't root.
|
|
*/
|
|
if (seteuid(0)) {
|
|
PLOGE("seteuid (root)");
|
|
}
|
|
if (setresgid(uid, uid, uid)) {
|
|
PLOGE("setresgid (%u)", uid);
|
|
}
|
|
if (setresuid(uid, uid, uid)) {
|
|
PLOGE("setresuid (%u)", uid);
|
|
}
|
|
}
|
|
|
|
char *get_command(const struct su_request *to) {
|
|
if (to->command)
|
|
return to->command;
|
|
if (to->shell)
|
|
return to->shell;
|
|
return DEFAULT_SHELL;
|
|
}
|
|
|
|
int fork_zero_fucks() {
|
|
int pid = fork();
|
|
if (pid) {
|
|
int status;
|
|
waitpid(pid, &status, 0);
|
|
return pid;
|
|
} else {
|
|
if (fork() != 0)
|
|
exit(0);
|
|
return 0;
|
|
}
|
|
}
|