679 lines
19 KiB
C
679 lines
19 KiB
C
/**
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* xrdp: A Remote Desktop Protocol server.
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*
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* Copyright (C) Laxmikant Rashinkar 2013 LK.Rashinkar@gmail.com
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdio.h>
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#include <gtk/gtk.h>
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#include <pthread.h>
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#include "gtcp.h"
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#define WINDOW_TITLE "Tcp Proxy Version 1.0"
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#define CONTEXT_ID 1
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#define MSG_INFO GTK_MESSAGE_INFO
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#define MSG_WARN GTK_MESSAGE_WARNING
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#define MSG_ERROR GTK_MESSAGE_ERROR
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#define MAIN_THREAD_YES 0
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#define MAIN_THREAD_NO 1
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/* globals */
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pthread_t g_tid;
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int g_keep_running = 1;
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int g_loc_io_count = 0; /* bytes read from local port */
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int g_rem_io_count = 0; /* bytes read from remote port */
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GtkWidget *g_btn_start;
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GtkWidget *g_tbx_loc_port;
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GtkWidget *g_tbx_rem_ip;
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GtkWidget *g_tbx_rem_port;
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GtkWidget *g_tbx_loc_stats;
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GtkWidget *g_tbx_rem_stats;
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GtkWidget *g_statusbar;
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GtkWidget *g_txtvu_loc_port;
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GtkWidget *g_txtvu_rem_port;
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/* forward declarations */
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static void *tcp_proxy(void *arg);
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static void show_msg(int not_main_thread, int style,
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const gchar *title, const gchar *msg);
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static void show_status(int not_main_thread, char *msg);
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static void clear_status(int not_main_thread);
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static void enable_btn_start(int main_thread);
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static void disable_btn_start(int main_thread);
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/* getters */
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static char *get_local_port();
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static char *get_remote_ip();
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static char *get_remote_port();
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/* setters */
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static void show_loc_port_stats(int main_thread, int count);
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static void show_rem_port_stats(int main_thread, int count);
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/* handlers */
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static gboolean on_delete_event(GtkWidget *widget, GdkEvent *ev, gpointer data);
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static void on_destroy(GtkWidget *widget, gpointer data);
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static void on_start_clicked(GtkWidget *widget, gpointer data);
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static void on_clear_clicked(GtkWidget *widget, gpointer data);
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static void on_quit_clicked(GtkWidget *widget, gpointer data);
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int main(int argc, char **argv)
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{
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/* init threads */
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g_thread_init(NULL);
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gdk_threads_init();
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/* setup GTK */
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gtk_init(&argc, &argv);
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/* create labels and right justify them */
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GtkWidget *lbl_loc_port = gtk_label_new("Local port");
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GtkWidget *lbl_rem_ip = gtk_label_new("Remote IP");
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GtkWidget *lbl_rem_port = gtk_label_new("Remote port");
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GtkWidget *lbl_loc_stats = gtk_label_new("Local port recv stats");
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GtkWidget *lbl_rem_stats = gtk_label_new("Remote port recv stats");
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gtk_misc_set_alignment(GTK_MISC(lbl_loc_port), 1.0, 0.5);
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gtk_misc_set_alignment(GTK_MISC(lbl_rem_ip), 1.0, 0.5);
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gtk_misc_set_alignment(GTK_MISC(lbl_rem_port), 1.0, 0.5);
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gtk_misc_set_alignment(GTK_MISC(lbl_loc_stats), 1.0, 0.5);
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gtk_misc_set_alignment(GTK_MISC(lbl_rem_stats), 1.0, 0.5);
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/* create text boxes */
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g_tbx_loc_port = gtk_entry_new();
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g_tbx_rem_ip = gtk_entry_new();
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g_tbx_rem_port = gtk_entry_new();
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g_tbx_loc_stats = gtk_entry_new();
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g_tbx_rem_stats = gtk_entry_new();
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/* stat text boxes are read only */
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gtk_entry_set_editable(GTK_ENTRY(g_tbx_loc_stats), FALSE);
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gtk_entry_set_editable(GTK_ENTRY(g_tbx_rem_stats), FALSE);
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/* enable when debugging */
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#if 0
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gtk_entry_set_text(GTK_ENTRY(g_tbx_loc_port), "1234");
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gtk_entry_set_text(GTK_ENTRY(g_tbx_rem_ip), "192.168.2.20");
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gtk_entry_set_text(GTK_ENTRY(g_tbx_rem_port), "43222");
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#endif
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/* setup buttons inside a HBox */
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g_btn_start = gtk_button_new_with_label("Start listening");
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GtkWidget *btn_clear = gtk_button_new_with_label("Clear receive stats");
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GtkWidget *btn_quit = gtk_button_new_with_label("Quit application");
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GtkWidget *hbox = gtk_hbox_new(FALSE, 5);
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gtk_box_pack_start_defaults(GTK_BOX(hbox), g_btn_start);
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gtk_box_pack_start_defaults(GTK_BOX(hbox), btn_clear);
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gtk_box_pack_start_defaults(GTK_BOX(hbox), btn_quit);
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#if 0
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g_txtvu_loc_port = gtk_text_view_new();
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g_txtvu_rem_port = gtk_text_view_new();
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#endif
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/* create table */
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GtkWidget *table = gtk_table_new(8, 3, FALSE);
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int row = 0;
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/* insert labels into table */
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gtk_table_attach(GTK_TABLE(table), lbl_loc_port, 0, 1, row, row + 1,
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GTK_FILL, GTK_FILL, 5, 0);
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row++;
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gtk_table_attach(GTK_TABLE(table), lbl_rem_ip, 0, 1, row, row + 1,
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GTK_FILL, GTK_FILL, 5, 0);
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row++;
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gtk_table_attach(GTK_TABLE(table), lbl_rem_port, 0, 1, row, row + 1,
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GTK_FILL, GTK_FILL, 5, 0);
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row++;
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gtk_table_attach(GTK_TABLE(table), lbl_loc_stats, 0, 1, row, row + 1,
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GTK_FILL, GTK_FILL, 5, 0);
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row++;
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gtk_table_attach(GTK_TABLE(table), lbl_rem_stats, 0, 1, row, row + 1,
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GTK_FILL, GTK_FILL, 5, 0);
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row++;
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row = 0;
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/* insert text boxes into table */
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gtk_table_attach(GTK_TABLE(table), g_tbx_loc_port, 1, 2, row, row + 1,
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GTK_FILL, GTK_FILL, 5, 0);
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row++;
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gtk_table_attach(GTK_TABLE(table), g_tbx_rem_ip, 1, 2, row, row + 1,
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GTK_FILL, GTK_FILL, 5, 0);
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row++;
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gtk_table_attach(GTK_TABLE(table), g_tbx_rem_port, 1, 2, row, row + 1,
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GTK_FILL, GTK_FILL, 5, 0);
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row++;
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gtk_table_attach(GTK_TABLE(table), g_tbx_loc_stats, 1, 2, row, row + 1,
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GTK_FILL, GTK_FILL, 5, 0);
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row++;
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gtk_table_attach(GTK_TABLE(table), g_tbx_rem_stats, 1, 2, row, row + 1,
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GTK_FILL, GTK_FILL, 5, 0);
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row++;
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row++;
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/* insert hbox with buttons into table */
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gtk_table_attach(GTK_TABLE(table), hbox, 1, 2, row, row + 1,
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GTK_FILL, GTK_FILL, 5, 0);
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row++;
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#if 0
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/* text view to display hexdumps */
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gtk_table_attach(GTK_TABLE(table), g_txtvu_loc_port, 0, 2, row, row + 1,
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GTK_FILL, GTK_FILL, 5, 0);
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row++;
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#endif
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/* status bar to display messages */
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g_statusbar = gtk_statusbar_new();
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gtk_statusbar_set_has_resize_grip(GTK_STATUSBAR(g_statusbar), TRUE);
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gtk_table_attach(GTK_TABLE(table), g_statusbar, 0, 2, row, row + 1,
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GTK_FILL, GTK_FILL, 5, 0);
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/* setup main window */
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GtkWidget *window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
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gtk_container_set_border_width(GTK_CONTAINER(window), 5);
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gtk_window_set_default_size(GTK_WINDOW(window), 640, 480);
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gtk_window_set_title(GTK_WINDOW(window), WINDOW_TITLE);
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gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
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gtk_window_set_resizable(GTK_WINDOW(window), FALSE);
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gtk_container_add(GTK_CONTAINER(window), table);
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gtk_widget_show_all(window);
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/* setup callbacks */
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g_signal_connect(window, "delete-event", G_CALLBACK(on_delete_event), NULL);
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g_signal_connect(window, "destroy", G_CALLBACK(on_destroy), NULL);
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g_signal_connect(g_btn_start, "clicked", G_CALLBACK(on_start_clicked), NULL);
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g_signal_connect(btn_clear, "clicked", G_CALLBACK(on_clear_clicked), NULL);
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g_signal_connect(btn_quit, "clicked", G_CALLBACK(on_quit_clicked), NULL);
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gdk_threads_enter();
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gtk_main();
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gdk_threads_leave();
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return 0;
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}
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/**
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* Start listening on specifed local socket; when we get a connection,
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* connect to specified remote server and transfer data between local
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* and remote server
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*****************************************************************************/
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static void *tcp_proxy(void *arg)
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{
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char buf[1024 * 32];
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int lis_skt = -1;
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int acc_skt = -1;
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int con_skt = -1;
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int sel = 0;
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int rv = 0;
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int i = 0;
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int count = 0;
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int sent = 0;
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/* create listener socket */
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if ((lis_skt = tcp_socket_create()) < 0)
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{
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show_msg(MAIN_THREAD_NO, MSG_ERROR, "Creating socket",
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"\nOperation failed. System out of resources");
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enable_btn_start(MAIN_THREAD_NO);
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return NULL;
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}
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/* place it in non blocking mode */
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tcp_set_non_blocking(lis_skt);
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if ((rv = tcp_bind(lis_skt, get_local_port())) != 0)
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{
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show_msg(MAIN_THREAD_NO, MSG_ERROR, "Bind error",
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"\nUnable to bind socket, cannot continue");
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tcp_close(lis_skt);
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enable_btn_start(MAIN_THREAD_NO);
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return NULL;
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}
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/* listen for incoming connection */
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if (tcp_listen(lis_skt))
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{
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show_msg(MAIN_THREAD_NO, MSG_ERROR, "Listen error",
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"\nUnable to listen on socket, cannot continue");
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tcp_close(lis_skt);
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enable_btn_start(MAIN_THREAD_NO);
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return NULL;
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}
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show_status(MAIN_THREAD_NO, "Waiting for client connections");
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/* accept incoming connection */
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while (g_keep_running)
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{
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acc_skt = tcp_accept(lis_skt);
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if (acc_skt > 0)
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{
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/* client connected */
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show_status(MAIN_THREAD_NO, "Client connected");
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tcp_close(lis_skt);
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lis_skt = -1;
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break;
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}
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if ((acc_skt < 0) && (tcp_last_error_would_block()))
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{
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/* no connection, try again */
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usleep(250);
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continue;
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}
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else
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{
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tcp_close(lis_skt);
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lis_skt = -1;
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enable_btn_start(MAIN_THREAD_NO);
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return NULL;
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}
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}
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/* we have a client connection, try connecting to server */
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if ((con_skt = tcp_socket()) < 0)
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{
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show_msg(MAIN_THREAD_NO, MSG_ERROR, "Creating socket",
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"\nOperation failed. System out of resources");
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tcp_close(lis_skt);
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tcp_close(acc_skt);
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enable_btn_start(MAIN_THREAD_NO);
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return NULL;
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}
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/* place it in non blocking mode */
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tcp_set_non_blocking(con_skt);
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rv = tcp_connect(con_skt, get_remote_ip(), get_remote_port());
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#if 0
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if (rv < 0)
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{
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show_status(MAIN_THREAD_NO, "Could not connect to server");
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tcp_close(lis_skt);
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tcp_close(acc_skt);
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enable_btn_start(MAIN_THREAD_NO);
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return NULL;
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}
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#endif
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if ((rv < 0) && (tcp_last_error_would_block(con_skt)))
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{
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for (i = 0; i < 100; i++)
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{
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if (tcp_can_send(con_skt, 100))
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break;
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usleep(100);
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}
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if (i == 100)
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{
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show_status(MAIN_THREAD_NO, "Could not connect to server");
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tcp_close(lis_skt);
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tcp_close(acc_skt);
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enable_btn_start(MAIN_THREAD_NO);
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return NULL;
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}
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}
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show_status(MAIN_THREAD_NO, "Connected to server");
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rv = 0;
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while (g_keep_running && rv == 0)
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{
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if ((sel = tcp_select(con_skt, acc_skt)) == 0)
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{
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usleep(10);
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continue;
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}
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if (sel & 1)
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{
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/* can read from con_skt without blocking */
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count = tcp_recv(con_skt, buf, 1024 * 16, 0);
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rv = count < 1;
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if (rv == 0)
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{
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g_loc_io_count += count;
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show_loc_port_stats(MAIN_THREAD_NO, g_loc_io_count);
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/* TODO: hexdump data here */
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sent = 0;
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while ((sent < count) && (rv == 0) && (g_keep_running))
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{
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i = tcp_send(acc_skt, buf + sent, count - sent, 0);
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if ((i == -1) && tcp_last_error_would_block(acc_skt))
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{
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tcp_can_send(acc_skt, 1000);
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}
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else if (i < 1)
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{
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rv = 1;
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}
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else
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{
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sent += i;
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}
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}
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}
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}
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if (sel & 2)
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{
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/* can read from acc_skt without blocking */
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count = tcp_recv(acc_skt, buf, 1024 * 16, 0);
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rv = count < 1;
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if (rv == 0)
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{
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g_rem_io_count += count;
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show_rem_port_stats(MAIN_THREAD_NO, g_rem_io_count);
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/* TODO: hexdump data here */
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sent = 0;
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while ((sent < count) && (rv == 0) && (g_keep_running))
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{
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i = tcp_send(con_skt, buf + sent, count - sent, 0);
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if ((i == -1) && tcp_last_error_would_block(con_skt))
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{
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tcp_can_send(con_skt, 1000);
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}
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else if (i < 1)
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{
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rv = 1;
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}
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else
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{
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sent += i;
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}
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}
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}
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}
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}
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tcp_close(lis_skt);
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tcp_close(con_skt);
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tcp_close(acc_skt);
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show_status(MAIN_THREAD_NO, "Connection closed");
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enable_btn_start(MAIN_THREAD_NO);
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return NULL;
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}
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/**
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* Display a message using specified style dialog
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*
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* @param style information, warning or error
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* @param title text to be displayed in title bar
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* @param msg message to be displayed
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*****************************************************************************/
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static void show_msg(int not_main_window, int style,
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const gchar *title, const gchar *msg)
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{
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GtkWidget *dialog;
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if (not_main_window)
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gdk_threads_enter();
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dialog = gtk_message_dialog_new(GTK_WINDOW(NULL),
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GTK_DIALOG_DESTROY_WITH_PARENT,
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style,
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GTK_BUTTONS_OK,
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"%s", msg);
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gtk_window_set_title(GTK_WINDOW(dialog), title);
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gtk_dialog_run(GTK_DIALOG(dialog));
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gtk_widget_destroy(dialog);
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if (not_main_window)
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gdk_threads_leave();
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}
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/**
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* Write message to status bar
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*****************************************************************************/
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static void show_status(int not_main_thread, char *msg)
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{
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if (not_main_thread)
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gdk_threads_enter();
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gtk_statusbar_push(GTK_STATUSBAR(g_statusbar), CONTEXT_ID, msg);
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if (not_main_thread)
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gdk_threads_leave();
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}
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/**
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* Clear status bar
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*****************************************************************************/
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static void clear_status(int not_main_thread)
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{
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if (not_main_thread)
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gdk_threads_enter();
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gtk_statusbar_remove_all(GTK_STATUSBAR(g_statusbar), CONTEXT_ID);
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if (not_main_thread)
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gdk_threads_leave();
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}
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/**
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* Enable 'Start Listening' button
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*****************************************************************************/
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static void enable_btn_start(int not_main_thread)
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{
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if (not_main_thread)
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gdk_threads_enter();
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gtk_widget_set_sensitive(GTK_WIDGET(g_btn_start), TRUE);
|
|
|
|
if (not_main_thread)
|
|
gdk_threads_leave();
|
|
}
|
|
|
|
/**
|
|
* Disable 'Start Listening' button
|
|
*****************************************************************************/
|
|
|
|
static void disable_btn_start(int not_main_thread)
|
|
{
|
|
if (not_main_thread)
|
|
gdk_threads_enter();
|
|
|
|
gtk_widget_set_sensitive(GTK_WIDGET(g_btn_start), FALSE);
|
|
|
|
if (not_main_thread)
|
|
gdk_threads_leave();
|
|
}
|
|
|
|
/**
|
|
* Return local port setting
|
|
*****************************************************************************/
|
|
|
|
static char *get_local_port()
|
|
{
|
|
const char *cptr = gtk_entry_get_text(GTK_ENTRY(g_tbx_loc_port));
|
|
return (char *) cptr;
|
|
}
|
|
|
|
/**
|
|
* Return remote IP setting
|
|
*****************************************************************************/
|
|
|
|
static char *get_remote_ip()
|
|
{
|
|
const char *cptr = gtk_entry_get_text(GTK_ENTRY(g_tbx_rem_ip));
|
|
return (char *) cptr;
|
|
}
|
|
|
|
/**
|
|
* Return remote port setting
|
|
*****************************************************************************/
|
|
|
|
static char *get_remote_port()
|
|
{
|
|
const char *cptr = gtk_entry_get_text(GTK_ENTRY(g_tbx_rem_port));
|
|
return (char *) cptr;
|
|
}
|
|
|
|
/**
|
|
* Update local port stat counter
|
|
*****************************************************************************/
|
|
|
|
static void show_loc_port_stats(int not_main_thread, int count)
|
|
{
|
|
char buf[128];
|
|
|
|
sprintf(buf, "%d", count);
|
|
|
|
if (not_main_thread)
|
|
gdk_threads_enter();
|
|
|
|
gtk_entry_set_text(GTK_ENTRY(g_tbx_loc_stats), buf);
|
|
|
|
if (not_main_thread)
|
|
gdk_threads_leave();
|
|
}
|
|
|
|
/**
|
|
* Update remote port stat counter
|
|
*****************************************************************************/
|
|
|
|
static void show_rem_port_stats(int not_main_thread, int count)
|
|
{
|
|
char buf[128];
|
|
|
|
sprintf(buf, "%d", count);
|
|
|
|
if (not_main_thread)
|
|
gdk_threads_enter();
|
|
|
|
gtk_entry_set_text(GTK_ENTRY(g_tbx_rem_stats), buf);
|
|
|
|
if (not_main_thread)
|
|
gdk_threads_leave();
|
|
}
|
|
|
|
/**
|
|
* User clicked on window close button
|
|
*****************************************************************************/
|
|
|
|
static gboolean on_delete_event(GtkWidget *widget, GdkEvent *ev, gpointer data)
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
/**
|
|
* Close application
|
|
*****************************************************************************/
|
|
|
|
static void on_destroy(GtkWidget *widget, gpointer data)
|
|
{
|
|
/* this will destory all windows and return control to gtk_main() */
|
|
gtk_main_quit();
|
|
}
|
|
|
|
/**
|
|
* Start a thread that listens for incoming connections
|
|
*****************************************************************************/
|
|
|
|
static void on_start_clicked(GtkWidget *widget, gpointer data)
|
|
{
|
|
/* local port must be specified */
|
|
if (gtk_entry_get_text_length(GTK_ENTRY(g_tbx_loc_port)) == 0)
|
|
{
|
|
show_msg(MAIN_THREAD_YES, MSG_ERROR, "Invalid entry",
|
|
"\nYou must enter a value for Local Port");
|
|
return;
|
|
}
|
|
|
|
/* remote IP must be specified */
|
|
if (gtk_entry_get_text_length(GTK_ENTRY(g_tbx_rem_ip)) == 0)
|
|
{
|
|
show_msg(MAIN_THREAD_YES, MSG_ERROR, "Invalid entry",
|
|
"\nYou must enter a value for Remote IP");
|
|
return;
|
|
}
|
|
|
|
/* remote port must be specified */
|
|
if (gtk_entry_get_text_length(GTK_ENTRY(g_tbx_rem_port)) == 0)
|
|
{
|
|
show_msg(MAIN_THREAD_YES, MSG_ERROR, "Invalid entry",
|
|
"\nYou must enter a value for Remote Port");
|
|
return;
|
|
}
|
|
|
|
if (pthread_create(&g_tid, NULL, tcp_proxy, NULL))
|
|
{
|
|
show_msg(MAIN_THREAD_YES, MSG_ERROR, "Starting listener",
|
|
"\nThread create error. System out of resources");
|
|
return;
|
|
}
|
|
|
|
disable_btn_start(MAIN_THREAD_YES);
|
|
}
|
|
|
|
/**
|
|
* Clear stat counters
|
|
*****************************************************************************/
|
|
|
|
static void on_clear_clicked(GtkWidget *widget, gpointer data)
|
|
{
|
|
g_loc_io_count = 0;
|
|
g_rem_io_count = 0;
|
|
show_loc_port_stats(MAIN_THREAD_YES, g_loc_io_count);
|
|
show_rem_port_stats(MAIN_THREAD_YES, g_rem_io_count);
|
|
}
|
|
|
|
/**
|
|
* Quit application
|
|
*****************************************************************************/
|
|
|
|
static void on_quit_clicked(GtkWidget *widget, gpointer data)
|
|
{
|
|
/* this will destory all windows and return control to gtk_main() */
|
|
gtk_main_quit();
|
|
}
|