Set DHCP options using LwIP in C

Question

Where can I change the configs of the dhcp options when sending a dhcp request with the LwIP library?

I need to set option 53 (DHCP message type (discover)), 61 (client identifier), 12 (host name), 60 (vendor class identifier) and 55 (parameter request list).

I created my project with CubeMx on stm32f7.

Pinetwig · Accepted Answer · 2018-06-25 13:22:25Z

2

Unfortunately, not all DHCP options are exposed in the lwIP API (as of lwIP 2.0.3). Option 12 can be enabled with the LWIP_NETIF_HOSTNAME define. For the others, you'll have to add support in src\core\ipv*\dhcp.c . See the dhcp_discover and the dhcp_parse_reply functions.

answered Jun 25, 2018 at 13:22

Pinetwig

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2 Comments

MasterRem Over a year ago

I'm now able to add the options. It doesn't work very well with CubeMx because all the modifications in src\core\ipv*\dhcp.c disappear every time I regenerate the code, but I'll just copy/paste again everytime. Thank you.

Craig McQueen Over a year ago

@MasterRem I would be wary of a tool that overwrites your source files like that. I'd recommend using version control (e.g. Subversion or git) to safely manage your code development.

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