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check for return values!!!

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Felix Schulze 2022-01-29 16:07:55 +01:00 committed by GitHub
parent d19dc66e2a
commit 9df42871ff
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1 changed files with 10 additions and 3 deletions
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13
lab1/login_linux.c
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@ -91,20 +91,27 @@ int main(int argc, char *argv[]) {
printf(" You're in !\n"); printf(" You're in !\n");
passwddata->pwfailed = 0; passwddata->pwfailed = 0;
passwddata->pwage = passwddata->pwage + 1; passwddata->pwage = passwddata->pwage + 1;
mysetpwent(user, passwddata); if (mysetpwent(user, passwddata) < 0) { /* execute the command */
perror("Error");exit(EXIT_FAILURE);
}
if (passwddata->pwage > 100) { if (passwddata->pwage > 100) {
printf(" Your password is OLD!!!!\n"); printf(" Your password is OLD!!!!\n");
} }
/* check UID, see setuid(2) */ /* check UID, see setuid(2) */
setuid(passwddata->uid);
if (setuid(passwddata->uid) < 0) { /* execute the command */
perror("Error");exit(EXIT_FAILURE);
}
/* start a shell, use execve(2) */ /* start a shell, use execve(2) */
if (execve("/bin/bash",NULL,NULL) < 0) { /* execute the command */ if (execve("/bin/bash",NULL,NULL) < 0) { /* execute the command */
perror("Error");exit(EXIT_FAILURE); perror("Error");exit(EXIT_FAILURE);
} }
} else { } else {
passwddata->pwfailed = passwddata->pwfailed + 1; passwddata->pwfailed = passwddata->pwfailed + 1;
mysetpwent(user, passwddata); if (mysetpwent(user, passwddata) < 0) { /* execute the command */
perror("Error");exit(EXIT_FAILURE);
}
} }
} }
printf("Login Incorrect \n"); printf("Login Incorrect \n");