Re: [lwip-users] Problems with MiniOS and lwIP (1.3.2) on their daytime server application

[Pîrvu Mihai]

Alright, I have "fixed" this in the sense that I needed to connect with nectonn_connect to the srerver, rather than using netcat (and linux sockets for that matter). I realise my client/server application has to use the lwip API.

I am now stuck with another problem, as I'm trying to compile the client on linux using the UNIX port from unix/ports/proj/lib, linking the liblwip.so with my application, it creates a new interface (/dev/tap0) with the default IP 192.168.1.1. I am currently stuck with how to dynamically set the IP to that virtual interface it automatically creates.

Well, it's not much of a problem, I'm sure following the call stack will get me the solution, I just wanted to call the initial issue "resolved" in the sense that I now somewhat understand what I must do :)

Mihai

On Sun, Jul 19, 2015 at 6:54 AM, Pîrvu Mihai <address@hidden> wrote:

Hello, I want to start by saying that I'm really new with the platform (like 3 days of research), but i stumbled upon a problem i can't fix. I hope this won't be considered spam :)

Anyway, my problem is pretty simple probably. I'm trying to access the daytime server, which is ran default when compiling with lwIP 

I looked inside the source of daytime.c, provitded by Mini OS, and I saw that the setting up of an IP address is disabled with an "if(0) { ... }" construct, so I changed that and set my ip to: 10.0.2.10/24  (so it is in the same network as Dom0) like this:

....

    start_networking();

    if (1) {

        struct ip_addr ipaddr = { htonl(0x0a00020A) }; //10.0.2.10

        struct ip_addr netmask = { htonl(0xffffff00) }; // 255.255.255.0

        struct ip_addr gw = { 0 };

        networking_set_addr(&ipaddr, &netmask, &gw);

    }

....

The compiling is fine (though I also have something to say about this, but in the footer of the mail).

I start the VM, with xl create domain_config, which looks like this:

kernel = "mini-os.gz"

memory = 32

name = "Mini-OS"

>

vif=['xenif']

I go into the console, and it all seems fine:

.....

mac is 00:16:3e:70:4a:02

**************************

[server] IP 0 netmask 0 gateway 0.

[server] TCP/IP bringup begins.

Thread "tcpip_thread": pointer: 0x00000000000ca738, stack: 0x0000000000220000

[tcpip_thread] TCP/IP bringup ends.

[server] Network is ready.

[server] Opening connection

[server] Connection at 0000000000042820

This is where I'm lost a little. I try to ping 10.0.2.10 and it works!

address@hidden:/home/mihai/xen/extras/mini-os# ping 10.0.2.10

PING 10.0.2.10 (10.0.2.10) 56(84) bytes of data.

64 bytes from 10.0.2.10: icmp_seq=1 ttl=255 time=0.546 ms

64 bytes from 10.0.2.10: icmp_seq=2 ttl=255 time=0.189 ms

64 bytes from 10.0.2.10: icmp_seq=3 ttl=255 time=0.142 ms

64 bytes from 10.0.2.10: icmp_seq=4 ttl=255 time=0.247 ms

But when I try to connect to 10.0.2.10:13 nothing happens.

My netcat just hangs, but it hangs on all ports, not just 13. I have to ctrl+c it so it dies, so it's not like the connection is rejected. But, on the console, nothing is printed. I even put a little print code after the 

session = netconn_accept(listener); 

part, so it shows me when that function has returned a "session", thus the connection is understood, but it never gets there, the function just blocks and never returns.

Here's the entire code, if you think I've done something wrong: http://pastebin.com/riuh5n0w

I tried to look with nmap, and all ports are closed.

Sorry if the question is 'stupid', I'm new to both projects (mini os and lwip) and I'm just trying to learn. 

Mihai