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3rd-party/lwip/dhserver: interface for dhcp reply

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If more than one interface is used, chances are that the last one added
will have changed the default interface used for sending data (see
netif_set_default). This causes problems for the DHCP server in the PAN
example as the DHCP reply is sent on the wrong network. On Windows this
can cause it to use the wrong address.

Send replies to the interface that received the dhcp request.
This commit is contained in:
Peter Harper 2023-01-18 11:26:25 +00:00
parent abb61bc22a
commit 88cd67309c
1 changed files with 13 additions and 2 deletions
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15
3rd-party/lwip/dhcp-server/dhserver.c vendored
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@ -231,6 +231,7 @@ static void udp_recv_proc(void *arg, struct udp_pcb *upcb, struct pbuf *p, const
uint8_t *ptr;
dhcp_entry_t *entry;
struct pbuf *pp;
struct netif *nif;
unsigned int n = p->len;
if (n > sizeof(dhcp_data)) n = sizeof(dhcp_data);
@ -262,7 +263,12 @@ static void udp_recv_proc(void *arg, struct udp_pcb *upcb, struct pbuf *p, const
pp = pbuf_alloc(PBUF_TRANSPORT, sizeof(dhcp_data), PBUF_POOL);
if (pp == NULL) break;
memcpy(pp->payload, &dhcp_data, sizeof(dhcp_data));
udp_sendto(upcb, pp, IP_ADDR_BROADCAST, port);
nif = ip_current_input_netif();
if (nif) {
udp_sendto_if(upcb, pp, IP_ADDR_BROADCAST, port, nif);
} else {
udp_sendto(upcb, pp, IP_ADDR_BROADCAST, port);
}
pbuf_free(pp);
break;
@ -306,7 +312,12 @@ static void udp_recv_proc(void *arg, struct udp_pcb *upcb, struct pbuf *p, const
if (pp == NULL) break;
memcpy(entry->mac, dhcp_data.dp_chaddr, 6);
memcpy(pp->payload, &dhcp_data, sizeof(dhcp_data));
udp_sendto(upcb, pp, IP_ADDR_BROADCAST, port);
nif = ip_current_input_netif();
if (nif) {
udp_sendto_if(upcb, pp, IP_ADDR_BROADCAST, port, nif);
} else {
udp_sendto(upcb, pp, IP_ADDR_BROADCAST, port);
}
pbuf_free(pp);
break;