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shared/netutils/dhcpserver: Reply on correct netif.

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The DHCP server broadcasts messages.  They are being sent via the default
netif which might be completely the wrong network.  We want to send
messages to the netif we got the original message from.

Original author: [Peter Harper](https://github.com/peterharperuk)
Source: https://github.com/raspberrypi/pico-examples/pull/392

Signed-off-by: Samveen <samveen@samveen.in>
This commit is contained in:
Peter Harper 2023-09-22 18:46:08 +05:30 committed by Damien George
parent 58c2c503a9
commit 584c495d32
1 changed files with 10 additions and 4 deletions
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14
shared/netutils/dhcpserver.c
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@ -118,7 +118,7 @@ static int dhcp_socket_bind(struct udp_pcb **udp, uint32_t ip, uint16_t port) {
return udp_bind(*udp, &addr, port);
}
static int dhcp_socket_sendto(struct udp_pcb **udp, const void *buf, size_t len, uint32_t ip, uint16_t port) {
static int dhcp_socket_sendto(struct udp_pcb **udp, struct netif *netif, const void *buf, size_t len, uint32_t ip, uint16_t port) {
if (len > 0xffff) {
len = 0xffff;
}
@ -132,7 +132,12 @@ static int dhcp_socket_sendto(struct udp_pcb **udp, const void *buf, size_t len,
ip_addr_t dest;
IP4_ADDR(&dest, ip >> 24 & 0xff, ip >> 16 & 0xff, ip >> 8 & 0xff, ip & 0xff);
err_t err = udp_sendto(*udp, p, &dest, port);
err_t err;
if (netif != NULL) {
err = udp_sendto_if(*udp, p, &dest, port, netif);
} else {
err = udp_sendto(*udp, p, &dest, port);
}
pbuf_free(p);
@ -153,7 +158,7 @@ static uint8_t *opt_find(uint8_t *opt, uint8_t cmd) {
return NULL;
}
static void opt_write_n(uint8_t **opt, uint8_t cmd, size_t n, void *data) {
static void opt_write_n(uint8_t **opt, uint8_t cmd, size_t n, const void *data) {
uint8_t *o = *opt;
*o++ = cmd;
*o++ = n;
@ -281,7 +286,8 @@ static void dhcp_server_process(void *arg, struct udp_pcb *upcb, struct pbuf *p,
opt_write_u32(&opt, DHCP_OPT_DNS, DEFAULT_DNS); // can have multiple addresses
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);
struct netif *netif = ip_current_input_netif();
dhcp_socket_sendto(&d->udp, netif, &dhcp_msg, opt - (uint8_t *)&dhcp_msg, 0xffffffff, PORT_DHCP_CLIENT);
ignore_request:
pbuf_free(p);