Re: DOSemu networking made easy

[Mateusz Viste <mateusz@viste-family.net>]

Hi

I do not think there is any ipv6 support in slirp. But it is not that important I believe, since there is no dos tcp/ip stack with ipv6 support :)


ebiederm@xmission.com wrote:

>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. :)

Mateusz
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