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Support for learning DNS servers through DHCP.

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likewise 2004-07-22 21:56:09 +00:00
parent a4f5673ff3
commit 786cbee510
2 changed files with 23 additions and 3 deletions
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19
src/core/dhcp.c
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@ -234,10 +234,11 @@ static err_t dhcp_select(struct netif *netif)
dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 3);
dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
dhcp_option_trailer(dhcp);
/* shrink the pbuf to the actual content length */
@ -484,6 +485,19 @@ static void dhcp_handle_ack(struct netif *netif)
if (option_ptr != NULL) {
dhcp->offered_bc_addr.addr = htonl(dhcp_get_option_long(&option_ptr[2]));
}
/* DNS servers */
option_ptr = dhcp_get_option_ptr(dhcp, DHCP_OPTION_DNS_SERVER);
if (option_ptr != NULL) {
u8_t n;
dhcp->dns_count = dhcp_get_option_byte(&option_ptr[1]);
/* limit to at most DHCP_MAX_DNS DNS servers */
if (dhcp->dns_count > DHCP_MAX_DNS) dhcp->dns_count = DHCP_MAX_DNS;
for (n = 0; n < dhcp->dns_count; n++)
{
dhcp->offered_dns_addr[n].addr = htonl(dhcp_get_option_long(&option_ptr[2+(n<<2)]));
}
}
}
/**
@ -703,10 +717,11 @@ static err_t dhcp_discover(struct netif *netif)
dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
dhcp_option_short(dhcp, 576);
dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 3);
dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
dhcp_option_trailer(dhcp);

7
src/include/lwip/dhcp.h
View File

@ -43,6 +43,10 @@ struct dhcp
struct ip_addr offered_sn_mask;
struct ip_addr offered_gw_addr;
struct ip_addr offered_bc_addr;
#define DHCP_MAX_DNS 2
u32_t dns_count; /* actual number of DNS servers obtained */
struct ip_addr offered_dns_addr[DHCP_MAX_DNS]; /* DNS server addresses */
u32_t offered_t0_lease; /* lease period (in seconds) */
u32_t offered_t1_renew; /* recommended renew time (usually 50% of lease period) */
u32_t offered_t2_rebind; /* recommended rebind time (usually 66% of lease period) */
@ -174,7 +178,8 @@ void dhcp_fine_tmr(void);
/** BootP options */
#define DHCP_OPTION_PAD 0
#define DHCP_OPTION_SUBNET_MASK 1 /* RFC 2132 3.3 */
#define DHCP_OPTION_ROUTER 3
#define DHCP_OPTION_ROUTER 3
#define DHCP_OPTION_DNS_SERVER 6
#define DHCP_OPTION_HOSTNAME 12
#define DHCP_OPTION_IP_TTL 23
#define DHCP_OPTION_MTU 26