#include #include main() { /* Identify the person logged in (real ID). */ printf("getuid = %d\n", getuid()); /* Get the ID in use by this process (effective ID). * Normally this is the same as above but if the program is: * * o Owned by root (chown root progname). * o Had 'Set owner' set in the permissions (chmod u+s progname). * o The disk is not mounted 'nosetuid'. * * We can use 'setuid' and 'seteuid'. */ printf("geteuid = %d\n", geteuid()); (!geteuid()) ? puts("setuid//setruid/seteuid will work.") : puts("setuid/setruid/seteuid will fail."); /* 0 = OK * -1 = Fail */ /* printf("seteuid return code = %d\n", seteuid(3570)); printf("getuid = %d\n", getuid()); printf("geteuid = %d\n", geteuid()); printf("seteuid return code = %d\n", seteuid(0)); printf("getuid = %d\n", getuid()); printf("geteuid = %d\n", geteuid()); */ printf("setuid return code = %d\n", setuid(4261)); printf("getuid = %d\n", getuid()); printf("geteuid = %d\n", geteuid()); } er'>master net-next plumbingsTobias Klauser
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