Linux Build - how to connect to the Web Ide

[espruino-discuss]

Posted at 2016-02-29 by Wilberforce

I've built using these instructions in a linux VM:

http://forum.espruino.com/comments/5764/

git clone https://github.com/espruino/Espruino.git­
cd Espruino
make

The exe spins up:

root@nodejs ~/Espruino# ./espruino
Interactive mode.
Size of JsVar is now 32 bytes
Size of JsVarRef is now 4 bytes
Added SIGINT hook
Added SIGHUP hook
Added SIGTERM hook
 1v85.1272 Copyright 2016 G.Williams

Espruino is Open Source. Our work is supported
only by sales of official boards and donations:
http://espruino.com/Donate

How do I connect with the Web ide?

I tried adding the IP of the VM under communications > Connect over Ip Address, however the instance is not found.

Do you need to set up a virtual com port, or can connect via IP to a Linux instance.

I'm hoping the VM version will be a lot more snappy for development - especially uploading when developing modules!

[espruino-discuss]

Posted at 2016-02-29 by Wilberforce

This works:

var http = require("http");
http.createServer(function (req, res) {
  res.writeHead(200);
  res.end("Hello World"); 
}).listen(8080);

http://192.168.69.12:8080/

I have checked telnet is not running - well it doesn't answer on :

telnet 192.168.69.12
Connecting To 192.168.69.12...Could not open connection to the host, on port 23: Connect failed

---

Posted at 2016-03-01 by @gfwilliams

I think @tve made the default telnet port on Linux 2323 - info here

On Linux you can't create a port below 1000 without admin priviledges, and generally you don't want to have to run Espruino like that.

Just typing 192.168.69.12:2323 into the port list should do it.

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Posted at 2016-03-01 by Wilberforce

Thanks for replying

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Posted at 2016-03-01 by @MaBecker

telnet syntax

telnet [host [port]]

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Posted at 2016-03-01 by Wilberforce

hmm. nobody home with:

telnet 192.168.69.12 2323

Connecting To 192.168.69.12...Could not open connection to the host, on ort 2323: Connect failed

or adding to the web ide..

Also, is this a concern - and what is the cause?
WARNING: jsnative.c sanity check failed (int-float-int passing)

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Posted at 2016-03-01 by @MaBecker

@wilberforce come to https://gitter.im/espruino/Espruino to gitter

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Posted at 2016-03-01 by Wilberforce

Thanks to @MaBecker, it turns out the Makefile had the telnet off by default, need to do a pull request and update!

BOARD=LINUX
LINUX=1
USE_FILESYSTEM=1
USE_HASHLIB=1
USE_GRAPHICS=1
USE_CRYPTO=1
USE_TLS=1
#USE_TELNET=1 # enable telnet to have it listen on port 2323 as JS console
#USE_LCD_SDL=1

USE_TELNET=1 # enable telnet to have it listen on port 2323 as JS console

---

Posted at 2016-03-01 by Wilberforce

WARNING: jsnative.c sanity check failed (int-float-int passing)

root@esp8266-VirtualBox:/home/esp8266/Espruino/Espruino# uname -a

Linux esp8266-VirtualBox 3.19.0-25-generic #26~14.04.1-Ubuntu SMP Fri Jul 24 21:18:00 UTC 2015 i686 i686 i686 GNU/Linux`

root@esp8266-VirtualBox:/home/esp8266/Espruino/Espruino# gcc -v

Using built-in specs.

COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/i686-linux-gnu/4.8/lto-wrapper
Target: i686-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.8.4-2ubuntu1~14.04' --with-bugurl=file:///usr/share/doc/gcc-4.8/README.Bugs --enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.8 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.8 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-libmudflap --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.8-i386/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.8-i386 --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.8-i386 --with-arch-directory=i386 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-targets=all --enable-multiarch --disable-werror --with-arch-32=i686 --with-multilib-list=m32,m64,mx32 --with-tune=generic --enable-checking=release --build=i686-linux-gnu --host=i686-linux-gnu --target=i686-linux-gnu
Thread model: posix
gcc version 4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04)

Ok on this system:

root@nodejs ~/Espruino# uname -a
Linux nodejs 3.2.0-4-amd64 #1 SMP Debian 3.2.68-1+deb7u3 x86_64 GNU/Linux

root@nodejs ~/Espruino# gcc -v

Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.7/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 4.7.2-5' --with-bugurl=file:///usr/share/doc/gcc-4.7/README.Bugs --enable-languages=c,c++,go,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.7 --enable-shared --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.7 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --enable-plugin --enable-objc-gc --with-arch-32=i586 --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.7.2 (Debian 4.7.2-5)

So I'm wondering if it a gcc version thing?

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Posted at 2016-03-02 by @gfwilliams

Ahh, thanks for letting me know. I guess I'm not 100% sure if it should be on by default then, since it's a massive security hole if anyone is currently using Espruino and isn't expecting a port to be opened.

You can always do USE_TELNET=1 make - although that should be documented. Ideally it would be a command-line option.

For int-float-int passing - that's interesting. It's referring to what happens if you call a function that takes those 3 arguments. It could be an issue with 32 bit x86 - I checked here and it happens on a real system too.

It's not a huge deal since it's actually pretty rare that particular argument format is used - I doubt you'd notice a problem. If you do come across it, you'll notice that some of the arguments get corrupted, but it won't cause a crash or anything.

When you post stuff like that up in future, please can you try and surround it in the 3 backticks? As it is, it's a real pain to look through and see what's text you've written and what's command output.

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Posted at 2016-03-02 by Wilberforce

I did try to use back ticks, but it went bung, so I removed them!

I thought I would add now on the iPad, however the character isn't on the keyboard!

For the Linux build is there any other way of loading code via the ide, if there isn't - that's why I was expecting it to be on by default. Can it be called a security hole if it's not on a default port?

As you say documenting makes all the difference!

I updated the gcc compiler on the 32 bit system - it made no difference

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Posted at 2016-03-02 by @gfwilliams

I did try to use back ticks

You probably need an empty line before and after - markdown is a pain like that!

For the Linux build is there any other way of loading code via the ide,

Kind of. You can set Linux up such that Espruino auto-runs and is accessible using a telnet server - There was a post on the forum about it. @tve only added the internal server relatively recently.

Can it be called a security hole if it's not on a default port?

I imagine so, yes. If I could port-scan your PC and then access it remotely with no password, I think that's something you'd want to fix :)

IMO the command-line option would be the way to go, and it can be documented in --help and also the Telnet docs I linked in my first post

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Posted at 2016-03-02 by Wilberforce

IMO the command-line option would be the way to go

Agreed

and also the Telnet docs I linked in my first post

http://www.espruino.com/Reference#Telnet
I guess it's making the association that the Telnet server implementation is what the web IDE is using, perhaps that could be spelt out.

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Posted at 2016-03-03 by tve

I wanted to use the telnet service on linux to run some tests (I think it was to make sure that the service wasn't tied to anything specific in the esp8266), so I made the changes necessary to be able to enable it, but I didn't want to open up the port in general given the security issues.