Initial commit

fakeid.c

@@ -0,0 +1,20 @@
+#define _GNU_SOURCE
+
+#include <dlfcn.h>
+#include <string.h>
+#include <sys/types.h>
+#include <pwd.h>
+
+char *username = "alice";
+
+int getlogin_r(char *buf, size_t bufsize) {
+    strncpy(buf, username, bufsize);
+    return 0;
+}
+
+struct passwd *getpwuid(uid_t uid) {
+    struct passwd *(*getpwuid)(uid_t) = dlsym(RTLD_NEXT, "getpwuid");
+    struct passwd *pass = getpwuid(uid);
+    pass->pw_name = username;
+    return pass;
+}