DNS failure + tcp 2.0.7

Kernel
1

friesen wrote on Thursday, September 27, 2018:

Any ideas why subdomain dns would be failing in 2.0.7 + tcp?

Examples would be mobile.google.com vs google.com

2

friesen wrote on Thursday, September 27, 2018:

I migrated from 2.0.1, I just copied the files over, perhaps I missed something.

Wireshark shows the query going out and the reply coming in, so somewhere it is getting lost.

3

heinbali01 wrote on Thursday, September 27, 2018:

Hi Erik, I will try this out and report back.

4

heinbali01 wrote on Thursday, September 27, 2018:

Hi Erik, in your other post I saw your FreeRTOSIPConfig.h with the following line:

#define ipconfigDNS_CACHE_NAME_LENGTH              ( 16 )

This limits the maximum length of domain names. If you double this value, you will find a domain like “mobile.google.com”.

In FreeRTOS+TCP 2.0.7 there are many more checks for correctness of incoming packets and also bound checking.

Note that ipconfigDNS_CACHE_NAME_LENGTH bytes will be declared on the program stack.

5

friesen wrote on Thursday, September 27, 2018:

I had ipconfigDNS_CACHE_NAME_LENGTH set to 16. The older version was hard coded to 128 length so it worked.

6

heinbali01 wrote on Thursday, September 27, 2018:

All right, thanks for reporting back!