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#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
int main(int argc, char* argv[])
{
if (argc < 4) {
fprintf(stderr, "usage: %s USERNAME PID SIGNAL\n", argv[0]);
return 1;
}
// switch user (requires root or "setcap cap_setuid,cap_setgid+ep")
char const* username = argv[1];
struct passwd const* pw = getpwnam(username);
if (!pw) {
fprintf(stderr, "no such user: %s\n", username);
return 1;
}
int ret = 0;
if ((ret = setgid(pw->pw_gid)) != 0)
fprintf(stderr, "setgid returned %d\n", ret);
if ((ret = setuid(pw->pw_uid)) != 0)
fprintf(stderr, "setuid returned %d\n", ret);
pid_t pid = atol(argv[2]);
int signum = atoi(argv[3]);
kill(pid, signum);
return 0;
}
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