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Improve ap example (#233)

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* Add dns server

The access point example is a bit complicated to use as you have to open
a browser and enter a url with the IP address of the device

Add a simple dns server that can be used to make the access point behave
like a captive portal. All DNS requests point back to the gateway IP.

* Improve AP example

The web page /ledtest gives you a web page with an option to turn the
led on and off

Start the DNS server and redirect all HTTP requests to this page.

Improve the code so it can handle more than one request at a time.

Fixes: #232
This commit is contained in:
Peter Harper
2023-01-23 14:35:33 +00:00
committed by GitHub
parent a605c65774
commit 566ce86a6e
5 changed files with 461 additions and 56 deletions
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3
pico_w/access_point/dhcpserver/dhcpserver.c
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@@ -63,7 +63,6 @@
#define PORT_DHCP_SERVER (67)
#define PORT_DHCP_CLIENT (68)
#define DEFAULT_DNS MAKE_IP4(8, 8, 8, 8)
#define DEFAULT_LEASE_TIME_S (24 * 60 * 60) // in seconds
#define MAC_LEN (6)
@@ -274,7 +273,7 @@ static void dhcp_server_process(void *arg, struct udp_pcb *upcb, struct pbuf *p,
opt_write_n(&opt, DHCP_OPT_SERVER_ID, 4, &ip4_addr_get_u32(ip_2_ip4(&d->ip)));
opt_write_n(&opt, DHCP_OPT_SUBNET_MASK, 4, &ip4_addr_get_u32(ip_2_ip4(&d->nm)));
opt_write_n(&opt, DHCP_OPT_ROUTER, 4, &ip4_addr_get_u32(ip_2_ip4(&d->ip))); // aka gateway; can have mulitple addresses
opt_write_u32(&opt, DHCP_OPT_DNS, DEFAULT_DNS); // can have mulitple addresses
opt_write_n(&opt, DHCP_OPT_DNS, 4, &ip4_addr_get_u32(ip_2_ip4(&d->ip))); // this server is the dns
opt_write_u32(&opt, DHCP_OPT_IP_LEASE_TIME, DEFAULT_LEASE_TIME_S);
*opt++ = DHCP_OPT_END;
dhcp_socket_sendto(&d->udp, &dhcp_msg, opt - (uint8_t *)&dhcp_msg, 0xffffffff, PORT_DHCP_CLIENT);