void start_debugger(pid_t target_pid) {
int status;
wait(&status);
struct user_regs_struct initial_registers;
trace_get_registers(target_pid, &initial_registers);
// Peek at a specific address:
unsigned bp_addr = 0x4000b0;
breakpoint *bp = breakpoint_create(target_pid, (void *)bp_addr);
trace_continue(target_pid);
wait(&status);
while (1) {
if (WIFSTOPPED(status)) {
struct user_regs_struct registers;
trace_get_registers(target_pid, ®isters);
printf("\nReached breakpoint at 0x%08llx\n", registers.rip);
breakpoint_handle(target_pid, bp);
int requesting_input = true;
while (requesting_input) {
input_option input = request_input(NULL);
if (input == INPUT_CONTINUE) {
trace_continue(target_pid);
requesting_input = false;
}
else if (input == INPUT_SINGLE_STEP) {
trace_single_step(target_pid);
requesting_input = false;
}
}
int resume_status;
wait(&resume_status);
if (WIFEXITED(resume_status)) {
printf("Process %d exited\n", target_pid);
return;
}
else if (WIFSTOPPED(resume_status)) {
printf("Process %d stopped\n", target_pid);
return;
}
}
else if (WIFEXITED(status)) {
printf("Process %d exited\n", target_pid);
return;
}
else {
puts("Returning");
return;
}
}
}
static int pptp_connect(struct vpn_provider *provider,
struct connman_task *task, const char *if_name,
vpn_provider_connect_cb_t cb, const char *dbus_sender,
void *user_data)
{
const char *username, *password;
int err;
DBG("iface %s provider %p user %p", if_name, provider, user_data);
if (connman_task_set_notify(task, "getsec",
pptp_get_sec, provider)) {
err = -ENOMEM;
goto error;
}
username = vpn_provider_get_string(provider, "PPTP.User");
password = vpn_provider_get_string(provider, "PPTP.Password");
DBG("user %s password %p", username, password);
if (!username || !password) {
struct pptp_private_data *data;
data = g_try_new0(struct pptp_private_data, 1);
if (!data)
return -ENOMEM;
data->task = task;
data->if_name = g_strdup(if_name);
data->cb = cb;
data->user_data = user_data;
err = request_input(provider, request_input_cb, dbus_sender,
data);
if (err != -EINPROGRESS) {
free_private_data(data);
goto done;
}
return err;
}
done:
return run_connect(provider, task, if_name, cb, user_data,
username, password);
error:
if (cb)
cb(provider, user_data, err);
return err;
}
void handle_user_input(char *program_name) {
while (1) {
input_option input = request_input(NULL);
if (input == INPUT_RUN) {
begin_debugging(program_name);
}
else if (input == INPUT_CREATE_BREAKPOINT) {
puts("New breakpoint!");
}
else if (input == INPUT_REMOVE_BREAKPOINT) {
puts("Removing breakpoint!");
}
else if (input == INPUT_QUIT) {
exit(0);
}
else {
puts("Unknown input");
}
}
}