fix gui issue with receiver

readme update
specifiy iui fallback version
2023-08-19 18:46:26 +02:00 · 2023-08-19 16:37:10 +02:00 · 2023-08-19 16:31:48 +02:00 · 2023-08-19 16:30:50 +02:00 · 2023-08-19 16:14:35 +02:00 · 2023-03-02 18:00:55 +01:00
9 changed files with 2266 additions and 143 deletions
--- a/16
+++ b/16
@ -0,0 +1,16 @@
+QFT: An application for Quick (and really reliable) Peer-To-Peer file transfer.
+
+Copyright (C) 2022  Daniel H. / TudbuT
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
--- a/Cargo.lock
+++ b/Cargo.lock
@ -2,6 +2,660 @@
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+ "libc",
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+ "libc",
+]
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+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
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+[[package]]
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+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
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+[[package]]
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+checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
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+ "winapi",
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--- a/Cargo.toml
+++ b/Cargo.toml
@ -1,8 +1,14 @@
 [package]
 name = "qft"
-version = "0.1.5"
+version = "0.5.6"
 edition = "2021"

 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

 [dependencies]
+iui = { git = "https://github.com/rust-native-ui/libui-rs", optional = true, version = "0.3" }
+rand = { version = "0.8", optional = true }
+time = "0.3"
+
+[features]
+gui = [ "dep:iui", "dep:rand" ]
--- a/Cross.toml
+++ b/Cross.toml
@ -0,0 +1,2 @@
+[target.x86_64-apple-darwin]
+image = "ghcr.io/cross-rs/x86_64-apple-darwin-cross:local"
--- a/674
+++ b/674
@ -0,0 +1,674 @@
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+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
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+available, or (2) arrange to deprive yourself of the benefit of the
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+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
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+
+  If, pursuant to or in connection with a single transaction or
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+receiving the covered work authorizing them to use, propagate, modify
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+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
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+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
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+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
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+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
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+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
--- a/README.md
+++ b/README.md
@ -1,5 +1,13 @@
 # qft
-QFT is a small command line application for Quick Peer-To-Peer UDP file transfer.
+
+QFT is a small application for Quick (and really reliable) Peer-To-Peer UDP file transfer. 
+
+## If a friend sent you here...
+
+...look at the "Releases" section on the sidebar. You should see a link titled vX.Y.Z. Click on
+that, and then choose the right file for your OS: `qft` for Linux, `qft-mac` for Mac, and `qft.exe`
+for Windows. Download this file, make it executable in case of Linux or Mac, and then follow your
+friend's instructions on how to receive the file they wanted to send you.

 ## Usage:
 - Find a public QFT helper (for example tudbut.de:4277)
@ -7,13 +15,144 @@ QFT is a small command line application for Quick Peer-To-Peer UDP file transfer
 - On the receiver PC, enter `qft receiver <helper> <shared-phrase> <filename>`.
 - Both PCs should start transferring after a short while. If they don't, try again.

+OR
+- On both PCs, enter `qft gui`.
+- Select mode
+- Select file to send and file to save to
+- Update the shared phrases and bitrate to match
+- Click start
+
+### Arguments:
+```
+qft helper   <bind-port>
+qft sender   <helper-address>:<helper-port> <phrase> <filename> [send-delay] [bitrate] [skip]
+qft receiver <helper-address>:<helper-port> <phrase> <filename> [bitrate] [skip]
+```
+
+## What helpers do
+
+Helpers are NOT relays for data, they are only used to ESTABLISH the connection.
+
+Helpers are there to help with holepunching.
+- P1 connects\* to helper
+- P1 sends the phrase to the helper
+- P1 waits for a response
+- Some time passes
+- P2 connects\* to the same helper
+- P2 sends the phrase to the helper
+- P2 gets P1's public IP and port
+- P1 gets P2's public IP and port
+- P1 and P2 disconnect\* from the helper
+- P1 and P2 start a loop (slightly simplified):
+  - fire a packet at eachother multiple times
+  - try to receive as many packets from the other one
+  - if none are received, loop again
+  - if one is received, exit the loop
+- Connection between P1 and P2 is established.
+
+\*UDP is a connection-less protocol, there are no handshakes. The word "connection" is used here as
+an indicator that data will be exchanged between the "connected" parties. The word "disconnect" is used
+here as an indicator that no more data will be exchanged between the "previously connected" parties.
+
+## Debunking some myths about P2P networking
+
+- "True P2P is only possible without a NAT" - [Both my experiments and wikipedia would like to have
+  a word about hole punching.](https://en.wikipedia.org/wiki/UDP_hole_punching) The only issue I
+  have found are *some* german mobile data providers, but sending large files over mobile data is
+  rarely something you'd want to do - and if so, use something like croc or the magic wormhole,
+  which aren't purely true P2P.
+- "Croc is P2P as well, why does this exist?" - Croc is not Peer-to-Peer. Croc uses a relay server
+  to exchange data between the two clients (unless one of the client has a port-forward set up,
+  which is almost never the case). That is Client-to-Server-to-Client, which is *not* really
+  Peer-to-Peer. Peer-to-Peer means two clients sending their data directly to eachother, without a
+  server. "Peers make a portion of their resources, such as processing power, disk storage or
+  network bandwidth, directly available to other network participants, without the need for central
+  coordination by servers or stable hosts." -
+  [Wikipedia](https://en.wikipedia.org/wiki/Peer-to-peer)
+
 ## Tips 'n Tricks
 - You can add a number to the end of both of your commands (after the filename) to
-  boost transfer speeds (higher = faster), but a too large number might cause unreliability
-  due to local network conditions or VPNs.
+  boost transfer speeds (lower = faster), but a too small number might cause unreliability
+  due to local network conditions, VPNs, etc (default is 500). This will modify the delay between
+  packets sent.
+- You can also add a number *after that*. It will modify packet size, and a higher number here has
+  similar effects as a lower one in the previous arg.
+- You can run a helper yourself, as the "helper" mode argument suggests. This helper should simply
+  be run on a server which is reachable from all over the web (a cheap VPS will definitely do).
+- Helpers don't **have to** be run on a public server, they work in LAN too, but that way, only
+  computers in the same LAN will be able to use them.
+- You can allow streaming (for example when you want to transmit from /dev/stdin) by setting
+  the `QFT_STREAM` environmental variable.
+- To use qfts and qftr aliases on linux or mac, run (replacing `(shell)` with your shell name,
+  usually bash or zsh):
+```sh
+echo 'alias qftr="qft receiver tudbut.de:4277"' >> ~/.(shell)rc
+echo 'alias qfts="qft sender tudbut.de:4277"' >> ~/.(shell)rc
+source ~/.(shell)rc
+```
+
+## Cool stuff
+- Files are transferred over UDP, but qft has additional reliability measures in place to avoid
+  broken files.
+- Unreliable internet connection? No problem! QFT will simply pause transmission until the
+  connection is back! Doesn't work? Check out the "Resume a fully stopped transfer" section!
+- Did you know you can hibernate or suspend your computer while it's transferring and it'll continue
+  where it left of, even when only one side is suspended? (Unless your router blocked the port, read 
+  the "Resume a fully stopped transfer" section in that case)
+- QFT can withstand heavy ~~weather~~ network conditions: 1000ms ping is just as fast as 10ms ping,
+  packet loss/reorder rates of over 10% are tolerated (but can slow speeds down, especially when
+  ping is high).
+- It's written in *100% pure Rust*.
+
+## Resume a fully stopped transfer
+You most likely won't need this unless the transfer completely died due to a VERY long pause or a
+computer restart, but if you do:
+
+Stop qft on both ends and start it again with the [skip] parameter in place (if you didn't specify a
+bitrate before, the default is 256). It will skip those bytes and continue where you specified.

 ## Troubleshooting

-### It constantly says `CONNECTING`
+### It says `Connecting...` but doesn't connect
 One of your ends didn't correctly connect to the helper. Stop the transfer on both ends
 and try again.
+
+## Croc
+
+Many people have mentioned how this is like croc. It isn't, because croc uses a relay that all your
+data is sent through. This is a bottleneck and also means that the relay admins are responsible for
+the content that is sent. The relay also buffers a lot of data, meaning its RAM might fill up if the
+sender's connection is much faster than the receiver's. Croc being tagged "peer-to-peer" is
+misleading at best because it rarely uses the P2P capabilities (it requires a port-forward to do
+P2P, which is rarely done). Read the previous section about P2P myths if you think Croc is always
+peer-to-peer.
+
+## [Relevant XKCD](https://xkcd.com/949)
+
+![Relevant XKCD Image](https://imgs.xkcd.com/comics/file_transfer.png)
+
+## FAQ
+
+#### What is a helper?
+
+As explained above, it is used to establish the connection between the two partners.
+
+#### Why is a helper needed?
+
+Your router uses a thing called **N**etwork **A**ddress **T**ranslation. It is required because
+otherwise, there would be way too many IP addresses in use and the internet would cease to work
+during busy times. This NAT is also a problem however, because it is a layer between your PC and the
+open internet. When there is a new incoming connection, the NAT won't know which PC in your LAN to
+forward the connection to, so the connection is simply rejected. Any Peer-to-Peer software therefore
+needs a helper server (also called "STUN" server) which both peers will ask for the other's IP
+address and port. Both peers can then send a bunch of outgoing connections to eachother. If
+everything goes well, both peers have sent an outgoing with the right timing, causing both NATs to
+*think* they are outgoing connections, when actually, they are a sort of combination of incoming and 
+outgoing ones.
+
+TL;DR: P2P networking is impossible without a helper server, because of Routers. Port-forwarding
+would be required otherwise, which can be hard to set up.
+
+#### How to make a public/private helper?
+
+Read the 2nd bullet point in the Tips 'n Tricks section.
--- a/logo.png
+++ b/logo.png
--- a/src/gui.rs
+++ b/src/gui.rs
@ -0,0 +1,351 @@
+use std::{env, process, thread};
+
+use iui::{controls::*, *};
+
+#[derive(Clone)]
+struct RefMut<T> {
+    to: *mut T,
+}
+
+impl<T> RefMut<T> {
+    pub fn new(to: &mut T) -> RefMut<T> {
+        RefMut { to: to as *mut T }
+    }
+
+    pub fn get(&self) -> &mut T {
+        unsafe { self.to.as_mut().unwrap() }
+    }
+}
+
+unsafe impl<T> Sync for RefMut<T> {}
+
+unsafe impl<T> Send for RefMut<T> {}
+
+#[derive(Clone)]
+struct Ref<T> {
+    to: *const T,
+}
+
+impl<T> Ref<T> {
+    pub fn new(to: &T) -> Ref<T> {
+        Ref { to: to as *const T }
+    }
+
+    pub fn get(&self) -> &T {
+        unsafe { self.to.as_ref().unwrap() }
+    }
+}
+
+unsafe impl<T> Sync for Ref<T> {}
+
+unsafe impl<T> Send for Ref<T> {}
+
+fn wrap<T: Into<Control>>(ui: &UI, s: &str, c: T) -> Group {
+    let mut g = Group::new(ui, s);
+    g.set_child(ui, c);
+    return g;
+}
+
+pub fn gui() -> Result<(), iui::UIError> {
+    let ui: UI = UI::init()?;
+
+    let mut window = Window::new(&ui, "QFT", 500, 600, WindowType::NoMenubar);
+    let mut vbox = VerticalBox::new(&ui);
+    vbox.set_padded(&ui, false);
+
+    let mut mode = Combobox::new(&ui);
+    let modeb = Ref::new(&mode);
+    mode.append(&ui, "Receive");
+    mode.append(&ui, "Send");
+    mode.set_selected(&ui, 1);
+    let mdb = Ref::new(&mode);
+    vbox.append(&ui, wrap(&ui, "Mode: ", mode), LayoutStrategy::Compact);
+
+    let mut helper_data = HorizontalBox::new(&ui);
+    helper_data.set_padded(&ui, true);
+    let mut helper = Entry::new(&ui);
+    let helperb = Ref::new(&helper);
+    helper.set_value(&ui, "tudbut.de:4277");
+    helper_data.append(&ui, helper, LayoutStrategy::Stretchy);
+    let mut phrase = Entry::new(&ui);
+    let phraseb = Ref::new(&phrase);
+    phrase.set_value(
+        &ui,
+        format!("my-cool-phrase-{}", rand::random::<u16>()).as_str(),
+    );
+    helper_data.append(&ui, phrase, LayoutStrategy::Stretchy);
+    vbox.append(
+        &ui,
+        wrap(&ui, "Shared Phrase: ", helper_data),
+        LayoutStrategy::Compact,
+    );
+
+    let mut path = env::current_exe()
+        .unwrap()
+        .into_os_string()
+        .into_string()
+        .unwrap();
+    let pathb = Ref::new(&path);
+    let mut select_path = Button::new(&ui, format!("Select a file ({})", path).as_str());
+    let bb = RefMut::new(&mut select_path);
+    let pb = RefMut::new(&mut path);
+    let wb = Ref::new(&window);
+    let uib = Ref::new(&ui);
+    select_path.on_clicked(&ui, move |_| {
+        let r = if mdb.get().selected(uib.get()) == 0 {
+            wb.get()
+                .save_file(uib.get())
+                .map(|x| x.into_os_string().into_string().unwrap())
+        } else {
+            wb.get()
+                .open_file(uib.get())
+                .map(|x| x.into_os_string().into_string().unwrap())
+        };
+        match r {
+            Some(path) => {
+                bb.get()
+                    .set_text(uib.get(), format!("Select a file ({})", &path).as_str());
+                *pb.get() = path;
+            }
+            None => (),
+        }
+    });
+    vbox.append(
+        &ui,
+        wrap(&ui, "Path: ", select_path),
+        LayoutStrategy::Compact,
+    );
+
+    let mut delay = VerticalBox::new(&ui);
+    let mut delay_slider = Slider::new(&ui, 100, 3_000);
+    let delayb = Ref::new(&delay_slider);
+    let mut delay_box = Entry::new(&ui);
+    delay_slider.set_value(&ui, 500);
+    delay_box.set_value(&ui, "500");
+    // We know that ui.main() will wait until the UI is dead, so these are safe.
+    let sb = RefMut::new(&mut delay_slider);
+    let bb = RefMut::new(&mut delay_box);
+    let uib = Ref::new(&ui);
+    let uib1 = uib.clone();
+    delay_box.on_changed(&ui, move |val| {
+        sb.get().set_value(
+            uib.get(),
+            u16::from_str_radix(val.as_str(), 10).unwrap_or(256) as i32,
+        );
+    });
+    delay_slider.on_changed(&ui, move |val| {
+        bb.get().set_value(uib1.get(), val.to_string().as_str());
+    });
+    delay.set_padded(&ui, true);
+    delay.append(&ui, delay_slider, LayoutStrategy::Compact);
+    delay.append(&ui, delay_box, LayoutStrategy::Compact);
+    vbox.append(
+        &ui,
+        wrap(
+            &ui,
+            "Delay in µs: (higher = more reliable, lower = faster)",
+            delay,
+        ),
+        LayoutStrategy::Compact,
+    );
+
+    let mut speed = VerticalBox::new(&ui);
+    let mut speed_slider = Slider::new(&ui, 100, 3_000);
+    let speedb = Ref::new(&speed_slider);
+    let mut speed_box = Entry::new(&ui);
+    speed_slider.set_value(&ui, 256);
+    speed_box.set_value(&ui, "256");
+    // We know that ui.main() will wait until the UI is dead, so these are safe.
+    let sb = RefMut::new(&mut speed_slider);
+    let bb = RefMut::new(&mut speed_box);
+    let uib = Ref::new(&ui);
+    let uib1 = uib.clone();
+    speed_box.on_changed(&ui, move |val| {
+        sb.get().set_value(
+            uib.get(),
+            u16::from_str_radix(val.as_str(), 10).unwrap_or(256) as i32,
+        );
+    });
+    speed_slider.on_changed(&ui, move |val| {
+        bb.get().set_value(uib1.get(), val.to_string().as_str());
+    });
+    speed.set_padded(&ui, true);
+    speed.append(&ui, speed_slider, LayoutStrategy::Compact);
+    speed.append(&ui, speed_box, LayoutStrategy::Compact);
+    vbox.append(
+        &ui,
+        wrap(
+            &ui,
+            "Bitrate: (lower = more reliable, higher = faster)",
+            speed,
+        ),
+        LayoutStrategy::Compact,
+    );
+
+    let mut skip = Entry::new(&ui);
+    let skipb = Ref::new(&skip);
+    skip.set_value(&ui, "0");
+    vbox.append(
+        &ui,
+        wrap(&ui, "Resume from: ", skip),
+        LayoutStrategy::Compact,
+    );
+
+    let mut bar = ProgressBar::new();
+    let barb = RefMut::new(&mut bar);
+    bar.set_value(&ui, ProgressBarValue::Determinate(0));
+    vbox.append(&ui, wrap(&ui, "Progress: ", bar), LayoutStrategy::Compact);
+
+    let mut send_button = Button::new(&ui, "Start");
+    let bb = RefMut::new(&mut send_button);
+    let uib = Ref::new(&ui);
+    send_button.on_clicked(&ui, move |b| {
+        b.disable(uib.get());
+        let bb = bb.clone();
+        let rargs = env::args().collect::<Vec<String>>();
+        let mut args = vec![rargs.get(0).unwrap().clone()];
+        let a = String::from(match modeb.get().selected(uib.get()) {
+            0 => "receiver",
+            1 => "sender",
+            _ => "version",
+        });
+        args.push(a);
+        let a = helperb.get().value(uib.get());
+        args.push(a);
+        let a = phraseb.get().value(uib.get());
+        args.push(a);
+        let a = pathb.get().clone();
+        args.push(a);
+        if modeb.get().selected(uib.get()) == 1 {
+            let a = delayb.get().value(uib.get()).to_string();
+            args.push(a);
+        }
+        let a = speedb.get().value(uib.get()).to_string();
+        args.push(a);
+        let a = skipb.get().value(uib.get());
+        args.push(a);
+        match modeb.get().selected(uib.get()) {
+            0 => {
+                barb.get()
+                    .set_value(uib.get(), ProgressBarValue::Indeterminate);
+                let uib = uib.clone();
+                let barb = barb.clone();
+
+                thread::spawn(move || {
+                    let mut last_percentage = -1;
+                    let lpb = RefMut::new(&mut last_percentage);
+                    let uib1 = uib.clone();
+                    let barb1 = barb.clone();
+                    crate::receiver(&args, move |f| {
+                        let lpb1 = lpb.clone();
+                        let uib = uib1.clone();
+                        let barb = barb1.clone();
+                        uib1.get().queue_main(move || {
+                            let percentage = (f * 100 as f32) as i32;
+                            if percentage != *lpb1.get() {
+                                barb.get().set_value(
+                                    uib.get(),
+                                    ProgressBarValue::Determinate(percentage as u32),
+                                );
+                                *lpb1.get() = percentage;
+                            }
+                        })
+                    });
+                    let uib1 = uib.clone();
+                    let barb1 = barb.clone();
+                    uib.get().queue_main(move || {
+                        barb1
+                            .get()
+                            .set_value(uib1.get(), ProgressBarValue::Determinate(100));
+                        bb.get().enable(uib1.get());
+                    });
+                });
+            }
+            1 => {
+                barb.get()
+                    .set_value(uib.get(), ProgressBarValue::Indeterminate);
+                let uib = uib.clone();
+                let barb = barb.clone();
+
+                thread::spawn(move || {
+                    let mut last_percentage = -1;
+                    let lpb = RefMut::new(&mut last_percentage);
+                    let uib1 = uib.clone();
+                    let barb1 = barb.clone();
+                    crate::sender(&args, move |f| {
+                        let lpb1 = lpb.clone();
+                        let uib = uib1.clone();
+                        let barb = barb1.clone();
+                        uib1.get().queue_main(move || {
+                            let percentage = (f * 100 as f32) as i32;
+                            if percentage != *lpb1.get() {
+                                barb.get().set_value(
+                                    uib.get(),
+                                    ProgressBarValue::Determinate(percentage as u32),
+                                );
+                                *lpb1.get() = percentage;
+                            }
+                        })
+                    });
+                    let uib1 = uib.clone();
+                    let barb1 = barb.clone();
+                    uib.get().queue_main(move || {
+                        barb1
+                            .get()
+                            .set_value(uib1.get(), ProgressBarValue::Determinate(100));
+                        bb.get().enable(uib1.get());
+                    });
+                });
+            }
+            _ => panic!("invalid mode"),
+        }
+    });
+    vbox.append(
+        &ui,
+        wrap(&ui, "Start: ", send_button),
+        LayoutStrategy::Compact,
+    );
+
+    let uib = Ref::new(&ui);
+    window.on_closing(&ui, move |_| {
+        let mut quit_window =
+            Window::new(uib.get(), "Really quit?", 300, 100, WindowType::NoMenubar);
+        let mut vbox = VerticalBox::new(uib.get());
+
+        let label = Label::new(uib.get(), "Do you really want to quit?");
+        vbox.append(uib.get(), label, LayoutStrategy::Compact);
+
+        vbox.append(uib.get(), Spacer::new(uib.get()), LayoutStrategy::Stretchy);
+
+        let mut hbox = HorizontalBox::new(uib.get());
+        hbox.set_padded(uib.get(), true);
+        let mut button1 = Button::new(uib.get(), "Quit");
+        let uib1 = uib.clone();
+        button1.on_clicked(uib.get(), move |_| {
+            uib1.get().quit();
+            process::exit(0);
+        });
+        let mut button2 = Button::new(uib.get(), "Cancel");
+        let uib1 = uib.clone();
+        // We know button2 won't be destroyed until quit_window is dead, so these are fine
+        let qwb = RefMut::new(&mut quit_window);
+        button2.on_clicked(uib.get(), move |_| quit_window.hide(uib1.get()));
+        let quit_window = qwb.get();
+        hbox.append(uib.get(), button1, LayoutStrategy::Stretchy);
+        hbox.append(uib.get(), button2, LayoutStrategy::Stretchy);
+        vbox.append(uib.get(), hbox, LayoutStrategy::Compact);
+
+        quit_window.set_child(uib.get(), vbox);
+        let uib1 = uib.clone();
+        quit_window.on_closing(uib.get(), move |w| w.hide(uib1.get()));
+        quit_window.show(uib.get());
+    });
+
+    window.set_child(&ui, vbox);
+    window.show(&ui);
+
+    ui.event_loop().run(&ui);
+    println!("GUI done");
+
+    return Ok(());
+}
--- a/src/main.rs
+++ b/src/main.rs
@ -1,98 +1,69 @@
+#[cfg(feature = "gui")]
+mod gui;
+
 use std::{
    collections::HashMap,
-    fs::File,
-    io::{Error, Read, Write},
+    env,
+    fs::{File, OpenOptions},
+    io::{stdout, Error, Read, Seek, SeekFrom, Write},
    net::*,
+    ops::Mul,
    str::FromStr,
    thread,
    time::{Duration, SystemTime},
 };

-trait Ordinal {
-    fn ordinal(&self) -> isize;
-}
+use time::{Date, PrimitiveDateTime, Time};

+#[derive(Ord, Eq, PartialOrd, PartialEq)]
 enum SafeReadWritePacket {
-    WRITE,
-    ACK,
-    END,
-}
-
-impl Ordinal for SafeReadWritePacket {
-    fn ordinal(&self) -> isize {
-        match self {
-            SafeReadWritePacket::WRITE => 0,
-            SafeReadWritePacket::ACK => 1,
-            SafeReadWritePacket::END => 2,
-        }
-    }
+    Write,
+    Ack,
+    ResendRequest,
+    End,
 }
+use SafeReadWritePacket::*;

 struct SafeReadWrite {
    socket: UdpSocket,
+    last_transmitted: HashMap<u16, Vec<u8>>,
    packet_count_out: u64,
    packet_count_in: u64,
 }

+struct Wrap<T>(T);
+
+impl Mul<Wrap<&str>> for u64 {
+    type Output = String;
+
+    fn mul(self, rhs: Wrap<&str>) -> Self::Output {
+        let strings: Vec<&str> = (0..self).map(|_| rhs.0).collect();
+        strings.join("")
+    }
+}
+
 impl SafeReadWrite {
    pub fn new(socket: UdpSocket) -> SafeReadWrite {
        SafeReadWrite {
            socket,
+            last_transmitted: HashMap::new(),
            packet_count_in: 0,
            packet_count_out: 0,
        }
    }

-    pub fn write_safe(&mut self, buf: &[u8]) -> Result<(), Error> {
-        if buf.len() > 0xfffd {
-            panic!(
-                "too large data packet sent over SafeReadWrite ({} > 0xfffd)",
-                buf.len()
-            );
-        }
+    pub fn write_safe(&mut self, buf: &[u8], delay: u64) -> Result<(), Error> {
+        self.write_flush_safe(buf, false, delay)
+    }

-        let id = self.packet_count_out as u8;
-        self.packet_count_out += 1;
-
-        let mut buf = Vec::from(buf);
-        buf.insert(0, SafeReadWritePacket::WRITE.ordinal() as u8);
-        buf.insert(0, id);
-        let buf = buf.as_slice();
-
-        self.socket
-            .set_read_timeout(Some(Duration::from_secs(1)))
-            .expect("cannot set_read_timeout");
-
-        let mut resend = true;
-        while resend {
-            match self.socket.send(buf) {
-                Ok(x) => {
-                    if x != buf.len() {
-                        panic!("bad buf length")
-                    }
-                }
-                Err(x) => return Err(x),
-            }
-            let mut buf = [0, 0];
-            match self.socket.recv(&mut buf).ok() {
-                Some(x) => {
-                    if x == 0 {
-                        continue;
-                    }
-                    if buf[1] == SafeReadWritePacket::ACK.ordinal() as u8 && buf[0] == id {
-                        resend = false;
-                    }
-                }
-                None => {}
-            }
-        }
-        return Ok(());
+    pub fn write_flush_safe(&mut self, buf: &[u8], flush: bool, delay: u64) -> Result<(), Error> {
+        self.internal_write_safe(buf, Write, flush, false, delay)
    }

    pub fn read_safe(&mut self, buf: &[u8]) -> Result<(Vec<u8>, usize), Error> {
-        if buf.len() > 0xfffd {
+        if buf.len() > 0xfffc {
            panic!(
-                "attempted to receive too large data packet with SafeReadWrite ({} > 0xfffd)",
+                "attempted to receive too large data packet with SafeReadWrite ({} > 0xfffc)",
                buf.len()
            );
        }
@ -100,99 +71,259 @@ impl SafeReadWrite {
        let mut mbuf = Vec::from(buf);
        mbuf.insert(0, 0);
        mbuf.insert(0, 0);
+        mbuf.insert(0, 0);
        let buf: &mut [u8] = mbuf.as_mut();

        let mut r = (vec![], 0);

        let mut try_again = true;
+        let mut is_catching_up = false;
        while try_again {
            match self.socket.recv(buf) {
                Ok(x) => {
-                    if x == 0 {
+                    if x < 3 {
                        continue;
                    }
-                    if buf[0] <= self.packet_count_in as u8 {
+                    let id = u16::from_be_bytes([buf[0], buf[1]]);
+                    if id <= self.packet_count_in as u16 {
                        self.socket
-                            .send(&[buf[0], SafeReadWritePacket::ACK.ordinal() as u8])
+                            .send(&[buf[0], buf[1], Ack as u8])
                            .expect("send error");
                    }
-                    if buf[0] == self.packet_count_in as u8 {
+                    if id == self.packet_count_in as u16 {
+                        if id == 0xffff {
+                            println!("\nPacket ID wrap successful.");
+                        }
                        try_again = false;
                        self.packet_count_in += 1;
-                        r.1 = x - 2;
+                        r.1 = x - 3;
+                    } else if id > self.packet_count_in as u16
+                        && (id - self.packet_count_in as u16) < 0xC000
+                    {
+                        if !is_catching_up && !env::var("QFT_HIDE_DROPS").is_ok() {
+                            println!(
+                                "\r\x1b[KA packet dropped: {} (got) is newer than {} (expected)",
+                                &id,
+                                &(self.packet_count_in as u16)
+                            );
+                        }
+                        is_catching_up = true;
+                        // ask to resend, then do nothing
+                        let id = (self.packet_count_in as u16).to_be_bytes();
+                        self.socket
+                            .send(&[id[0], id[1], ResendRequest as u8])
+                            .expect("send error");
                    }
-                    if buf[1] == SafeReadWritePacket::END.ordinal() as u8 {
+                    if buf[2] == End as u8 {
                        return Ok((vec![], 0));
                    }
                }
-                Err(x) => return Err(x),
+                Err(_) => {}
            }
        }
        mbuf.remove(0);
        mbuf.remove(0);
+        mbuf.remove(0);
        r.0 = mbuf;
        return Ok(r);
    }

    pub fn end(mut self) -> UdpSocket {
-        let id = self.packet_count_out as u8;
-        self.packet_count_out += 1;
-
-        let mut buf = vec![];
-        buf.insert(0, SafeReadWritePacket::END.ordinal() as u8);
-        buf.insert(0, id);
-        let buf = buf.as_slice();
+        let _ = self.internal_write_safe(&mut [], End, true, true, 3000);

        self.socket
-            .set_read_timeout(Some(Duration::from_secs(1)))
-            .expect("cannot set_read_timeout");
+    }

-        let mut resend = true;
-        while resend {
+    fn internal_write_safe(
+        &mut self,
+        buf: &[u8],
+        packet: SafeReadWritePacket,
+        flush: bool,
+        exit_on_lost: bool,
+        delay: u64,
+    ) -> Result<(), Error> {
+        if buf.len() > 0xfffc {
+            panic!(
+                "too large data packet sent over SafeReadWrite ({} > 0xfffc)",
+                buf.len()
+            );
+        }
+
+        let id = (self.packet_count_out as u16).to_be_bytes();
+        let idn = self.packet_count_out as u16;
+        self.packet_count_out += 1;
+
+        let mut vbuf = Vec::from(buf);
+        vbuf.insert(0, packet as u8);
+        vbuf.insert(0, id[1]);
+        vbuf.insert(0, id[0]); // this is now the first byte
+        let buf = vbuf.as_slice();
+
+        loop {
            match self.socket.send(buf) {
                Ok(x) => {
                    if x != buf.len() {
-                        panic!("internet down")
-                    }
-                }
-                Err(_) => return self.socket,
-            }
-            let mut buf = [0, 0];
-            match self.socket.recv(&mut buf).ok() {
-                Some(x) => {
-                    if x == 0 {
                        continue;
                    }
-                    if buf[1] == SafeReadWritePacket::ACK.ordinal() as u8 && buf[0] == id {
-                        resend = false;
+                }
+                Err(_) => {
+                    continue;
+                }
+            }
+            thread::sleep(Duration::from_micros(delay));
+            self.last_transmitted.insert(idn, vbuf);
+            break;
+        }
+        let mut buf = [0, 0, 0];
+        let mut wait = idn == 0xffff || flush;
+        if self.last_transmitted.len() < 256 {
+            self.socket
+                .set_read_timeout(Some(Duration::from_millis(1)))
+                .unwrap();
+        } else {
+            wait = true;
+        }
+        let mut start = unix_millis();
+        if idn == 0xffff {
+            print!("\nPacket ID needs to wrap. Waiting for partner to catch up...")
+        }
+        let mut is_catching_up = false;
+        loop {
+            match (
+                if !wait {
+                    self.socket.set_nonblocking(true).unwrap()
+                } else {
+                    ()
+                },
+                self.socket.recv(&mut buf).ok(),
+                self.socket.set_nonblocking(false).unwrap(),
+            )
+                .1
+            {
+                Some(x) => {
+                    if x != 3 {
+                        continue;
+                    }
+                    if buf[2] == Ack as u8 {
+                        let n = u16::from_be_bytes([buf[0], buf[1]]);
+                        self.last_transmitted.remove(&n);
+                        if n == idn {
+                            if idn == 0xffff {
+                                println!("\r\x1b[KPacket ID wrap successful.");
+                            }
+                            wait = false;
+                            self.last_transmitted.clear(); // if the latest packet is ACK'd, all
+                                                           // previous ones must be as well.
+                        }
+                    }
+                    if buf[2] == ResendRequest as u8 {
+                        let mut n = u16::from_be_bytes([buf[0], buf[1]]);
+                        thread::sleep(Duration::from_millis(100));
+                        while let Some(_) = self.socket.recv(&mut buf).ok() {}
+                        if !is_catching_up && !env::var("QFT_HIDE_DROPS").is_ok() {
+                            println!("\r\x1b[KA packet dropped: {}", &n);
+                        }
+                        if !is_catching_up {
+                            wait = true;
+                            is_catching_up = true;
+                            while n <= idn && !(idn == 0xffff && n == 0) {
+                                let buf = self.last_transmitted.get(&n);
+                                if let Some(buf) = buf {
+                                    loop {
+                                        // resend until success
+                                        match self.socket.send(&buf.as_slice()) {
+                                            Ok(x) => {
+                                                if x != buf.len() {
+                                                    continue;
+                                                }
+                                            }
+                                            Err(_) => {
+                                                continue;
+                                            }
+                                        };
+                                        thread::sleep(Duration::from_millis(4));
+                                        break;
+                                    }
+                                } else {
+                                    break;
+                                }
+                                // do NOT remove from last_transmitted yet, wait for Ack to do that.
+                                n += 1;
+                            }
+                        }
+                    }
+                }
+                None => {
+                    if unix_millis() - start > 5000 && exit_on_lost {
+                        break;
+                    }
+                    if unix_millis() - start > 10000 {
+                        println!("\n10s passed since last packet ==> Contact broke. Trying to resend packet...");
+                        if let Some(buf) = self.last_transmitted.get(&idn) {
+                            loop {
+                                match self.socket.send(buf) {
+                                    Ok(x) => {
+                                        if x != buf.len() {
+                                            continue;
+                                        }
+                                    }
+                                    Err(_) => {
+                                        continue;
+                                    }
+                                }
+                                thread::sleep(Duration::from_millis(4));
+                                break;
+                            }
+                            start = unix_millis();
+                        } else {
+                            break; // Latest packet was already ACK'd ==> No packets properly lost ==> Can continue with next packet.
+                        }
+                    }
+                    if !wait {
+                        break;
                    }
                }
-                None => {}
            }
        }
-
        self.socket
+            .set_read_timeout(Some(Duration::from_millis(1000)))
+            .unwrap();
+        return Ok(());
    }
 }

 fn main() {
    let args: Vec<String> = std::env::args().collect();
-    if args.len() <= 1 {
-        print_args(&args);
+    if args.len() == 0 {
+        panic!("no args");
+    }
+    if args.len() == 1 {
+        #[cfg(feature = "gui")]
+        match gui::gui() {
+            Ok(_) => (),
+            Err(_) => print_args(&args),
+        }
+        #[cfg(not(feature = "gui"))]
+        print_args(&args)
    }
    match args
        .get(1)
-        .expect("no args supplied, check if the first arg is truly the program name")
+        .unwrap() // checked in previous if-statement
        .as_str()
    {
        "helper" => helper(&args),
-        "sender" => sender(&args),
-        "receiver" => receiver(&args),
+        "sender" => sender(&args, |_| {}),
+        "receiver" => receiver(&args, |_| {}),
+        #[cfg(feature = "gui")]
+        "gui" => gui::gui().expect("can't use gui"),
+        #[cfg(not(feature = "gui"))]
+        "gui" => println!("Feature 'gui' was not enabled during compilation. GUI not available."),
+        "version" => println!("QFT version: {}", env!("CARGO_PKG_VERSION")),
        _ => print_args(&args),
    }
 }

-fn helper(args: &Vec<String>) {
+pub fn helper(args: &Vec<String>) {
    let bind_addr = (
        "0.0.0.0",
        u16::from_str_radix(args[2].as_str(), 10).expect("invalid port: must be integer"),
@ -200,6 +331,14 @@ fn helper(args: &Vec<String>) {
    let mut map: HashMap<[u8; 200], SocketAddr> = HashMap::new();
    let listener = UdpSocket::bind(&bind_addr).expect("unable to create socket");
    let mut buf = [0 as u8; 200];
+    let mut last_log_time = unix_millis();
+    let mut amount_since_log = 0;
+    let mut helper_log = OpenOptions::new()
+        .create(true)
+        .write(true)
+        .append(true)
+        .open("qft_helper_log.txt")
+        .expect("unable to create helper log");
    loop {
        let (l, addr) = listener.recv_from(&mut buf).expect("read error");
        if l != 200 {
@ -223,6 +362,27 @@ fn helper(args: &Vec<String>) {
            {
                // success!
                println!("Helped {} and {}! :D", addr, other);
+                amount_since_log += 1;
+                if unix_millis() - last_log_time > 10000 {
+                    let d = PrimitiveDateTime::new(
+                        Date::from_calendar_date(1970, time::Month::January, 1).unwrap(),
+                        Time::MIDNIGHT,
+                    ) + Duration::from_millis(unix_millis());
+                    helper_log
+                        .write(
+                            format!(
+                                "{} | {} {}>\n",
+                                d,
+                                amount_since_log,
+                                amount_since_log * Wrap("=")
+                            )
+                            .as_bytes(),
+                        )
+                        .expect("error writing to log");
+                    helper_log.flush().expect("error writing to log");
+                    last_log_time = unix_millis();
+                    amount_since_log = 0;
+                }
            }
            map.remove(&buf);
        } else {
@ -231,9 +391,23 @@ fn helper(args: &Vec<String>) {
    }
 }

-fn sender(args: &Vec<String>) {
+pub fn sender<F: Fn(f32)>(args: &Vec<String>, on_progress: F) {
    let connection = holepunch(args);
-    let br = u32::from_str_radix(args.get(5).unwrap_or(&"256".to_string()), 10).expect("This is not a correct number");
+    let dly = args
+        .get(5)
+        .map(|s| u64::from_str_radix(s, 10))
+        .unwrap_or(Ok(500))
+        .expect("bad delay operand");
+    let br = args
+        .get(6)
+        .map(|s| u32::from_str_radix(s, 10))
+        .unwrap_or(Ok(256))
+        .expect("bad bitrate argument");
+    let begin = args
+        .get(7)
+        .map(|s| u64::from_str_radix(s, 10))
+        .unwrap_or(Ok(0))
+        .expect("bad begin operand");
    let mut buf: Vec<u8> = Vec::new();
    buf.resize(br as usize, 0);
    let mut buf = buf.leak();
@ -243,49 +417,123 @@ fn sender(args: &Vec<String>) {
    }))
    .expect("file not readable");

+    if begin != 0 {
+        println!("Skipping to {}...", begin);
+        file.seek(SeekFrom::Start(begin)).expect("unable to skip");
+        println!("Done.");
+    }
+
    let mut sc = SafeReadWrite::new(connection);
    let mut bytes_sent: u64 = 0;
+    let mut last_update = unix_millis();
+    let len = file.metadata().expect("bad metadata").len();
+    sc.write_safe(&len.to_be_bytes(), 3000)
+        .expect("unable to send file length");
+    println!("Length: {}", &len);
+    let mut time = unix_millis();
    loop {
        let read = file.read(&mut buf).expect("file read error");
-        if read == 0 {
+        if read == 0 && !env::var("QFT_STREAM").is_ok() {
            println!();
            println!("Transfer done. Thank you!");
            sc.end();
            return;
        }

-        sc.write_safe(&buf[..read]).expect("send error");
+        sc.write_safe(&buf[..read], dly).expect("send error");
        bytes_sent += read as u64;
-        print!("\rSent {} bytes", bytes_sent);
+        if (bytes_sent % (br * 20) as u64) < (br as u64) {
+            let elapsed = unix_millis() - time;
+            let elapsed = if elapsed == 0 { 1 } else { elapsed };
+
+            print!(
+                "\r\x1b[KSent {} bytes; Speed: {} kb/s",
+                bytes_sent,
+                br as usize * 20 / elapsed as usize
+            );
+            stdout().flush().unwrap();
+            time = unix_millis();
+        }
+        if unix_millis() - last_update > 100 {
+            on_progress((bytes_sent + begin) as f32 / len as f32);
+            last_update = unix_millis();
+        }
    }
 }

-fn receiver(args: &Vec<String>) {
+pub fn receiver<F: Fn(f32)>(args: &Vec<String>, on_progress: F) {
    let connection = holepunch(args);
-    let br = u32::from_str_radix(args.get(5).unwrap_or(&"256".to_string()), 10).expect("This is not a correct number");
+    let br = args
+        .get(5)
+        .map(|s| u32::from_str_radix(s, 10))
+        .unwrap_or(Ok(256))
+        .expect("bad bitrate argument");
+    let begin = args
+        .get(6)
+        .map(|s| u64::from_str_radix(s, 10))
+        .unwrap_or(Ok(0))
+        .expect("bad begin operand");
    let mut buf: Vec<u8> = Vec::new();
    buf.resize(br as usize, 0);
-    let mut buf: &[u8] = buf.leak();
-    let mut file = File::create(args.get(4).unwrap_or_else(|| {
-        print_args(args);
-        panic!("unreachable")
-    }))
-    .expect("file not writable");
+    let buf: &[u8] = buf.leak();
+    let mut file = OpenOptions::new()
+        .truncate(false)
+        .write(true)
+        .create(true)
+        .open(&args.get(4).unwrap_or_else(|| {
+            print_args(args);
+            panic!("unreachable")
+        }))
+        .expect("file not writable");
+
+    if begin != 0 {
+        println!("Skipping to {}...", begin);
+        file.seek(SeekFrom::Start(begin)).expect("unable to skip");
+        println!("Done.");
+    }

    let mut sc = SafeReadWrite::new(connection);
    let mut bytes_received: u64 = 0;
+    let mut last_update = unix_millis();
+    let mut len_bytes = [0 as u8; 8];
+    let len = sc
+        .read_safe(&mut len_bytes)
+        .expect("unable to read length from sender")
+        .0;
+    let len = u64::from_be_bytes([
+        len[0], len[1], len[2], len[3], len[4], len[5], len[6], len[7],
+    ]);
+    let _ = file.set_len(len);
+    println!("Length: {}", &len);
+    let mut time = unix_millis();
    loop {
-        let (mbuf, len) = sc.read_safe(buf).expect("read error");
-        buf = &mbuf.leak()[..len];
-        if len == 0 {
+        let (mbuf, amount) = sc.read_safe(buf).expect("read error");
+        let buf = &mbuf.leak()[..amount];
+        if amount == 0 {
            println!();
            println!("Transfer done. Thank you!");
            return;
        }

        file.write(buf).expect("write error");
-        bytes_received += len as u64;
-        print!("\rReceived {} bytes", bytes_received);
+        file.flush().expect("file flush error");
+        bytes_received += amount as u64;
+        if (bytes_received % (br * 20) as u64) < (br as u64) {
+            let elapsed = unix_millis() - time;
+            let elapsed = if elapsed == 0 { 1 } else { elapsed };
+
+            print!(
+                "\r\x1b[KReceived {} bytes; Speed: {} kb/s",
+                bytes_received,
+                br as usize * 20 / elapsed as usize
+            );
+            stdout().flush().unwrap();
+            time = unix_millis();
+        }
+        if unix_millis() - last_update > 100 {
+            on_progress((bytes_received + begin) as f32 / len as f32);
+            last_update = unix_millis();
+        }
    }
 }

@ -325,24 +573,55 @@ fn holepunch(args: &Vec<String>) -> UdpSocket {
    holepunch
        .connect(SocketAddrV4::from_str(bind_addr.as_str()).unwrap())
        .expect("connection failed");
-    println!("Waiting...");
-    holepunch.set_read_timeout(Some(Duration::from_secs(1))).unwrap();
-    holepunch.set_write_timeout(Some(Duration::from_secs(1))).unwrap();
-    let mut stop = false;
-    while !stop {
-        let m = unix_millis();
-        thread::sleep(Duration::from_millis(500 - (m % 500)));
-        println!("CONNECT {}", unix_millis());
-        holepunch.send(&[0]).expect("connection failed");
-        if holepunch.recv(&mut [0]).is_ok() {
-            stop = true;
+    holepunch
+        .set_read_timeout(Some(Duration::from_secs(1)))
+        .unwrap();
+    holepunch
+        .set_write_timeout(Some(Duration::from_secs(1)))
+        .unwrap();
+    if env::var("QFT_USE_TIMED_HOLEPUNCH").is_ok() {
+        println!("Warning: You are using the QFT_USE_TIMED_HOLEPUNCH environment variable. This won't allow for more \
+            backwards-compatibility, rather it only exists as a fallback for bad connections. Please make absolutely \
+            sure your partner uses QFT_USE_TIMED_HOLEPUNCH as well, data might otherwise get corrupted on the receiver.");
+        println!("Waiting...");
+        let mut stop = false;
+        while !stop {
+            thread::sleep(Duration::from_millis(500 - (unix_millis() % 500)));
+            println!("CONNECT {}", unix_millis());
+            let _ = holepunch.send(&[0]);
+            let result = holepunch.recv(&mut [0, 0]);
+            if result.is_ok() && result.unwrap() == 1 {
+                holepunch.send(&[0, 0]).expect("connection failed");
+                let result = holepunch.recv(&mut [0, 0]);
+                if result.is_ok() && result.unwrap() == 2 {
+                    stop = true;
+                }
+            }
+        }
+    } else {
+        println!("Connecting...");
+        thread::sleep(Duration::from_millis(500 - (unix_millis() % 500)));
+        for _ in 0..40 {
+            let m = unix_millis();
+            let _ = holepunch.send(&[0]);
+            thread::sleep(Duration::from_millis((50 - (unix_millis() - m)).max(0)));
+        }
+        let mut result = Ok(1);
+        while result.is_ok() && result.unwrap() == 1 {
+            result = holepunch.recv(&mut [0, 0]);
+        }
+        holepunch.send(&[0, 0]).expect("connection failed");
+        holepunch.send(&[0, 0]).expect("connection failed");
+        result = Ok(1);
+        while result.is_ok() && result.unwrap() != 2 {
+            result = holepunch.recv(&mut [0, 0]);
+        }
+        result = Ok(1);
+        while result.is_ok() && result.unwrap() == 2 {
+            result = holepunch.recv(&mut [0, 0]);
        }
    }
-    println!(
-        "Holepunch and connection successful. Running with {} (partner) and :{} (you).",
-        bind_addr,
-        holepunch.local_addr().unwrap().port()
-    );
+    println!("Holepunch and connection successful.");
    return holepunch;
 }

@ -351,14 +630,16 @@ fn print_args(args: &Vec<String>) {
    println!(
        "No arguments. Needed: \n\
         | {} helper <bind-port>\n\
-         | {} sender <helper-address>:<helper-port> <phrase> <filename> [bitrate]\n\
-         | {} receiver <helper-address>:<helper-port> <phrase> <filename> [bitrate]",
-        f, f, f
+         | {} sender <helper-address>:<helper-port> <phrase> <filename> [send-dly] [bitrate] [skip]\n\
+         | {} receiver <helper-address>:<helper-port> <phrase> <filename> [bitrate] [skip]\n\
+         | {} gui\n\
+         | {} version\n",
+        f, f, f, f, f
    );
    panic!("No arguments");
 }

-fn unix_millis() -> u64 {
+pub fn unix_millis() -> u64 {
    SystemTime::now()
        .duration_since(SystemTime::UNIX_EPOCH)
        .unwrap()
Author	SHA1	Message	Date
TudbuT	578fdb0c1b	fix gui issue with receiver	2023-08-19 18:46:26 +02:00
TudbuT	61903d6140	readme update	2023-08-19 16:37:10 +02:00
TudbuT	bc28d99f87	specifiy iui fallback version	2023-08-19 16:31:48 +02:00
TudbuT	a0989bdc73	add delay option	2023-08-19 16:30:50 +02:00
TudbuT	9b7577ce65	migrate gui to a feature flag, drastically speed up send times	2023-08-19 16:14:35 +02:00
TudbuT	69081acc51	fix stdio	2023-03-02 18:00:55 +01:00
Daniel H	a10ebcd10c	Update README.md	2022-11-15 14:26:14 +01:00
TudbuT	74fc62483b	lockfile thing	2022-10-28 14:14:37 +02:00
TudbuT	f2d49809ac	version bump	2022-10-28 14:07:03 +02:00
TudbuT	7766698c68	fix a x/0 crash	2022-10-28 14:06:29 +02:00
TudbuT	0d34f49564	bump version	2022-10-03 18:59:57 +02:00
TudbuT	783116217d	Merge branch 'main' of github.com:TudbuT/qft	2022-10-03 18:48:21 +02:00
TudbuT	c8074ef4b6	better style	2022-10-03 18:48:18 +02:00
Daniel H	29fbb2de67	Merge pull request #5 from amatgil/main Speed indicator	2022-10-03 18:44:30 +02:00
amatgil	15c4327c85	Should be working correctly :))	2022-10-03 18:22:03 +02:00
amatgil	93d5806e49	Attempted to add speed indicator on both sender and receiver (untested)	2022-10-03 00:56:32 +02:00
TudbuT	f5caf49c92	Merge branch 'main' of github.com:TudbuT/qft	2022-09-06 18:04:24 +02:00
TudbuT	5347a60057	remove unused code	2022-09-06 18:04:14 +02:00
Daniel H	934a86d5b7	Update COPYING	2022-09-01 21:18:12 +02:00
TudbuT	2dc6b3343e	Merge branch 'main' of github.com:TudbuT/qft	2022-08-27 18:12:52 +02:00
TudbuT	7e7d922129	add a helper log	2022-08-27 18:10:13 +02:00
Daniel H	56fa241fe4	Create COPYING	2022-08-24 12:39:29 +02:00
Daniel H	ecd9646f59	Change license to GPLv3	2022-08-24 12:37:58 +02:00
Daniel H	3ef64b6903	Update README.md	2022-08-24 10:48:52 +02:00
TudbuT	40aa548781	dont replace the printed amount of bytes sent/received on each wrap	2022-08-24 10:00:53 +02:00
TudbuT	22aefed03a	dont replace the printed amount of bytes sent/received on each wrap	2022-08-23 13:32:51 +02:00
TudbuT	2a675aa9d5	fix a rare connection glitch	2022-08-23 10:06:09 +02:00
TudbuT	bd3e770a0d	make loading bar start as soon as connection is established	2022-08-23 09:51:39 +02:00
TudbuT	ba9003a88c	increase resend-buffer size	2022-08-21 22:21:32 +02:00
TudbuT	7c5f42916a	fix a few connection reliability issues	2022-08-21 21:55:32 +02:00
TudbuT	a7b28c1bc9	Merge branch 'main' of github.com:tudbut/qft	2022-08-21 20:38:33 +02:00
TudbuT	8de978608d	Merge branch 'main' of github.com:tudbut/qft	2022-08-21 20:38:27 +02:00
TudbuT	c72485f363	Merge branch 'main' of github.com:tudbut/qft	2022-08-21 20:36:53 +02:00
TudbuT	c02b5efdb2	Merge branch 'main' of github.com:tudbut/qft	2022-08-21 20:36:38 +02:00
TudbuT	df01da5ba1	Merge branch 'main' of github.com:tudbut/qft	2022-08-21 20:25:25 +02:00
TudbuT	1ebc3b4911	make gui open whenever no args are supplied	2022-08-21 20:24:59 +02:00
TudbuT	12728a4f17	make gui open whenever no args are supplied	2022-08-21 20:03:43 +02:00
TudbuT	e4ff6329ec	add working progress bar to receiver (breaks compatibility with 0.4)	2022-08-21 18:58:37 +02:00
TudbuT	ac3063c9d3	Merge branch 'main' of github.com:tudbut/qft	2022-08-21 15:04:18 +02:00
TudbuT	1c0e2a500a	delete gh-actions	2022-08-21 15:04:10 +02:00
Daniel H	e13c0dcba2	Update README.md	2022-08-21 14:54:56 +02:00
TudbuT	8b97d67ba4	attempt to fix gh-actions	2022-08-21 14:34:28 +02:00
TudbuT	b3478e58b0	Merge branch 'main' of github.com:tudbut/qft	2022-08-21 14:33:48 +02:00
TudbuT	0351b5e214	attempt to fix github actions	2022-08-21 14:33:31 +02:00
TudbuT	c15d53ce35	Merge branch 'main' of github.com:tudbut/qft	2022-08-21 14:31:31 +02:00
TudbuT	f149e5f8f5	attempt to fix github actions	2022-08-21 14:31:13 +02:00
TudbuT	86faa0659a	attempt to fix github actions	2022-08-21 14:12:30 +02:00
TudbuT	fd4f13e4a7	add a GUI	2022-08-21 14:10:10 +02:00
TudbuT	7dc768776e	attempt to fix github-actions	2022-08-21 14:09:07 +02:00
Daniel H	b8f5a83af5	Create rust.yml	2022-08-21 14:02:04 +02:00
TudbuT	b3933dd478	even better reliability	2022-08-20 18:55:24 +02:00
TudbuT	7a182731d3	FAQ section added	2022-08-20 18:22:56 +02:00
TudbuT	47114cd91d	add more info on reliability to readme	2022-08-20 11:07:22 +02:00
TudbuT	74865e30d5	add QFT_HIDE_DROPS environment variable	2022-08-20 11:01:46 +02:00
TudbuT	aa35f1bbe8	qft can now withstand loss=2% delay=500ms corrupt=2% duplicate=5% reorder=5% without losing connection, and it can get the same speed with 20ms ping and 1000ms ping	2022-08-20 10:44:59 +02:00
TudbuT	761831460f	add warning about QFT_USE_TIMED_HOLEPUNCH	2022-08-20 10:07:46 +02:00
TudbuT	49a1782b11	update readme	2022-08-19 12:02:31 +02:00
TudbuT	08890a7ece	less offensive tone about croc	2022-08-19 09:33:58 +02:00
TudbuT	cb7e4e85dc	improve code quality	2022-08-18 00:24:46 +02:00
TudbuT	7afef789fc	unify end() and write_safe() into internal_write_safe()	2022-08-18 00:10:42 +02:00
TudbuT	0b75ce13ba	fix the maximum packet size in readme	2022-08-17 22:15:55 +02:00
TudbuT	90b8cd023b	fix a typo in readme	2022-08-17 22:12:29 +02:00
TudbuT	8a4d8b4e94	fix a lot of packet id wrap-related issues	2022-08-17 21:36:24 +02:00
TudbuT	a09c2198d9	add mention of the single NAT i have found issues with	2022-08-17 19:08:22 +02:00
TudbuT	fe13a3a4ca	add clarification on what peer to peer means	2022-08-17 18:56:43 +02:00
TudbuT	d019906d6d	add mention of croc's peer-to-peer tag	2022-08-17 09:10:12 +02:00
TudbuT	a159a2b84b	add mention of croc	2022-08-17 09:05:22 +02:00
TudbuT	3c34497229	add tip about streaming to readme	2022-08-16 14:11:23 +02:00
TudbuT	ea3316b270	add streaming	2022-08-16 14:09:18 +02:00
TudbuT	3bb3bec5d3	fix a bug where transfer would slow down after a while on unreliable connections	2022-08-16 13:42:26 +02:00
TudbuT	e63fefe182	better catchup mechanism	2022-08-16 12:38:01 +02:00
TudbuT	b75a385e70	implement more parts of TCP to improve connection speed	2022-08-16 09:20:34 +02:00
TudbuT	3522d0ffa7	fix a few connection issues	2022-08-15 23:49:32 +02:00
TudbuT	02e3a8fd86	add a 'if a friend sent you' section to the readme	2022-08-15 22:01:50 +02:00
TudbuT	84accf9a2d	improve readability of 3rd point in cool stuff section in readme	2022-08-15 21:53:59 +02:00
TudbuT	921b959f14	improve holepunching drastically	2022-08-15 21:21:01 +02:00
TudbuT	5b1f0ec982	add lan helpers to tips	2022-08-15 18:58:52 +02:00
TudbuT	d612646d23	show max bitrate in readme	2022-08-15 18:55:25 +02:00
TudbuT	69f1200cad	more clarification on helpers	2022-08-15 18:50:11 +02:00
TudbuT	f1d8526baa	fix a typo	2022-08-15 18:48:14 +02:00
TudbuT	83ff73e793	add explaination of what helpers are for	2022-08-15 18:47:14 +02:00
TudbuT	7538883511	add pure rust to cool stuff section	2022-08-15 18:31:55 +02:00
TudbuT	b8f1284cdc	embed relevant xkcd	2022-08-15 18:28:17 +02:00
TudbuT	841eb76210	add relevant XKCD	2022-08-15 18:26:21 +02:00
Daniel H	620309d64a	Update README.md	2022-08-15 15:17:31 +02:00
TudbuT	5d3759d2f0	bump version	2022-08-15 14:48:11 +02:00
TudbuT	504097f1c8	improve tips and tricks	2022-08-15 14:41:46 +02:00
TudbuT	eeb074117c	clarify some errors	2022-08-15 14:22:17 +02:00
TudbuT	071ace4f4a	add exact Ord and Eq to derivations on SafeReadWritePacket	2022-08-15 14:10:18 +02:00
TudbuT	b6b782bd1d	use drived Ord instead of custom ordinal trait	2022-08-15 14:04:22 +02:00
TudbuT	5c14ed53ac	fix a typo in readme	2022-08-15 13:12:47 +02:00
TudbuT	92ca9d8f72	Merge branch 'main' of github.com:tudbut/qft	2022-08-15 13:11:55 +02:00
TudbuT	d7fe8dde9e	add more sections to readme	2022-08-15 13:10:59 +02:00
Daniel H	24785e44d6	Create LICENSE	2022-08-15 12:47:26 +02:00
TudbuT	7f943f241b	update readme	2022-08-15 12:26:07 +02:00
TudbuT	8ff073fd8a	update readme	2022-08-15 12:14:06 +02:00
TudbuT	a3570de65e	better code formatting	2022-08-15 12:01:47 +02:00
TudbuT	b4295c14ca	fix write panic	2022-08-14 23:39:37 +02:00
TudbuT	8aa7fe2129	allow resuming writes	2022-08-14 23:27:17 +02:00
Daniel H	300e558df2	Update README.md	2022-08-14 20:31:37 +02:00
Daniel H	d1816d5f8c	Update README.md	2022-08-14 20:28:03 +02:00
TudbuT	94350c46f0	fix receiver ping display	2022-08-14 18:39:48 +02:00
TudbuT	79670a6f9c	better ping printing	2022-08-14 16:40:11 +02:00
TudbuT	97b8129002	print ping	2022-08-14 13:58:39 +02:00
TudbuT	fa40f2f932	add logo	2022-08-14 12:04:23 +02:00
TudbuT	d09443ac47	fix a few connection issues	2022-08-14 11:45:30 +02:00
TudbuT	adb7042e35	fix a few bad disconnects	2022-08-13 18:56:34 +02:00
TudbuT	629228d365	better progress display	2022-08-13 17:37:57 +02:00