Re: DOSemu networking made easy

[ebiederm@xmission.com (Eric W. Biederman)]

Stas Sergeev <stsp@list.ru> writes:

> Aha, thanks for an explanation!
> Now I've started to understand what is this all about. :)
> Lets add dosemu-devel and Eric Biederman into CC.
> The beginning is here:
> http://marc.info/?l=linux-msdos&m=137207433306065&w=2

I can see the appeal, of unprivileged NAT.

I don't think I have run any network facing applications in DOS.

Does the slirp code make any pretense of supporting IPv6?  Or is it the
same code I used in college  20 years ago?

Eric

> 24.06.2013 19:38, Mateusz Viste пишет:
>> It would be really cool to have this incorporated into DOSemu, so for
>> example a network configuration could be something like:
>>
>>   $_pktdriver = (on)
>>   $_vnet = "slirp"
>>   $_netdev = "/usr/bin/slirp"
>>
>> And such configuration would provide working network connectivity in
>> any situation, without the user having to care about anything (as long
>> as the host would have network itself).
>>
>> I even looked at DOSemu source code, and locating the point where
>> DOSemu opens the TAP interface wasn't a big deal, and it would be easy
>> to implement any other alternative channel there, but I could not
>> locate the code where DOSemu sends/recv ethernet frames into/from the
>> TAP. If anybody tells me where in the code this happens, I might try
>> to look further.
> Sure: in pktnew.c please find the following:
> ---
>         if (write(pkt_fd, SEG_ADR((char *), ds, si), LWORD(ecx)) >= 0) {
>                     pd_printf("Write to net was ok\n");
>                     return 1;
> ---
>
> and the following:
> ---
>     size = read(fd, pkt_buf, PKT_BUF_SIZE);
>     if (size < 0) {
>         p_stats->errors_in++;           /* select() somehow lied */
>         return 0;
> ---
>
> and that's it. :)
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