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#include <pwd.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <cstdio>
#include <cstdlib>
#include <string>
void Help(const char* name) {
fprintf(stderr, "Usage: %s [enable/disable]\n", name);
exit(1);
}
void Err(const char* str) {
perror(str);
exit(1);
}
int main(int argc, char** argv) {
if (setgid(0) < 0) Err("setgid");
uid_t uid = getuid();
if (setresuid(uid, uid, 0) < 0) Err("setuid");
umask(0022);
bool del = false, flag = false;
if (argv == 0) Help("linger");
else if (argc != 2) Help(argv[0]);
try {
std::string mode_str(argv[1]);
if (mode_str == "enable") {
del = false;
} else if (mode_str == "disable") {
del = true;
} else {
Help(argv[0]);
}
struct passwd* pwd = getpwuid(uid);
if (!pwd) Err("getpwuid");
std::string path = std::string("/var/lib/systemd/linger/") + getpwuid(uid)->pw_name;
if (setresuid(uid, 0, 0) < 0) Err("setuid");
if (del) {
unlink(path.c_str());
} else {
int fd = open(path.c_str(), O_WRONLY | O_CREAT | O_NOCTTY | O_NONBLOCK, 0644);
if (fd >= 0) futimens(fd, nullptr);
close(fd);
}
} catch (...) { Err(argv[0]); }
}
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