ESP32 Forum

Posted: **Tue Dec 01, 2020 10:07 am**

Hello,

I've developing a device that could connect to a server using Wifi, Ethernet or Modem( in PPP mode).
Inside the device there is a simple HTTP (HTTPS in the future) that could be accessible from all three interphases. Due to I'm using >4.X version, netif abstraction make this very easy to implement but in some cases I want to restrict access over one interphase (in 95% of cases it will be over modem to reduce cost of internet data rates).

Is it possible? How can i do it?

Could I bind HTTP server socket only in Wifi and Ethernet?

Thanks.

Posted: **Mon Feb 22, 2021 7:54 am**

Any idea about if this is possible?
Thanks

Posted: **Thu Mar 11, 2021 11:27 am**

Due to from netif layer this issue seems that has no answer, I have been trying to solve it internally from the Web server handlers.

To get socket information I'm using this code:

Code: Select all

int socket_desc = httpd_req_to_sockfd(req);

Then, I tried to get interface name with lwip_getsockopt option but always return a 106 errno code (ETOOMANYREFS):

Code: Select all

	struct ifreq ifr;
	socklen_t ifr_len = sizeof(struct ifreq);
	ret = lwip_getsockopt(socket_desc, SOL_SOCKET, SO_BINDTODEVICE,  (void*)&ifr, &ifr_len);
	if (ret < 0) {
		ESP_LOGE(TAG, "Unable to bind socket to specified interface: errno %d", errno);
		return ESP_OK;
	}else{
		ESP_LOGW(TAG, "Interface name: %s", ifr.ifr_name);
	}

Is this function available from the LWIP stack?

Because this didn't work, I tried to get where socket is binded with option lwip_getsockname but always return rare data.

Do someone have any other idea?

Thanks

ESP32 Forum

Restrict access to web server when using modem PPP conection

Restrict access to web server when using modem PPP conection

Re: Restrict access to web server when using modem PPP conection

Re: Restrict access to web server when using modem PPP conection