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dhcp: announce the hostname via option 12

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Send the configured hostname on discover and request so the DHCP server
can register the device (e.g. in local DNS). Skipped while the hostname
is still empty, i.e. before set_hostname_default() has run.
This commit is contained in:
bloqaudio
2026-08-11 02:03:11 -05:00
parent 52692d05b1
commit 00a5f81871
1 changed files with 17 additions and 0 deletions
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dhcp.c
+17
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@@ -41,6 +41,7 @@ __xdata uip_ipaddr_t server;
#define DHCP_REBIND_LEN 4
#define DHCP_CLIENT_ID 61
#define DHCP_CLIENT_ID_LEN 7
#define DHCP_HOSTNAME 12
#define DHCP_REQUEST_IP 50
#define DHCP_REQUEST_IP_LEN 4
#define DHCP_PARAMS 55
@@ -116,6 +117,20 @@ void dhcp_addopt_client_id(void)
}
void dhcp_addopt_hostname(void)
{
uint8_t len = 0;
while (hostname[len])
len++;
if (!len)
return;
DHCP_OPT[dhcp_state.opt_ptr++] = DHCP_HOSTNAME;
DHCP_OPT[dhcp_state.opt_ptr++] = len;
memcpy(&DHCP_OPT[dhcp_state.opt_ptr], hostname, len);
dhcp_state.opt_ptr += len;
}
void dhcp_addopt_request_ip(void)
{
DHCP_OPT[dhcp_state.opt_ptr++] = DHCP_REQUEST_IP;
@@ -152,6 +167,7 @@ void dhcp_send_discover(void)
dhcp_addopt_client_id();
dhcp_addopt_request_ip();
dhcp_addopt_hostname();
DHCP_OPT[dhcp_state.opt_ptr++] = DHCP_PARAMS;
DHCP_OPT[dhcp_state.opt_ptr++] = 3;
@@ -188,6 +204,7 @@ void dhcp_send_request(void)
dhcp_addopt_client_id();
dhcp_addopt_request_ip();
dhcp_addopt_server_id();
dhcp_addopt_hostname();
DHCP_OPT[dhcp_state.opt_ptr++] = DHCP_PARAMS;
DHCP_OPT[dhcp_state.opt_ptr++] = 3;