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opt.h: added LWIP_DHCP_MAX_DNS_SERVERS to configure the maximum number of DNS servers configured from dhcp.c(v4) (if any; guarded with LWIP_DNS)

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This commit is contained in:
sg 2016-12-14 22:04:08 +01:00
parent 53b9f2a5bd
commit 4e3cf61571
2 changed files with 33 additions and 8 deletions
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32
src/core/ipv4/dhcp.c
View File

@ -103,6 +103,16 @@
#define REBOOT_TRIES 2
#if LWIP_DNS && LWIP_DHCP_MAX_DNS_SERVERS
#if DNS_MAX_SERVERS > LWIP_DHCP_MAX_DNS_SERVERS
#define LWIP_DHCP_PROVIDE_DNS_SERVERS LWIP_DHCP_MAX_DNS_SERVERS
#else
#define LWIP_DHCP_PROVIDE_DNS_SERVERS DNS_MAX_SERVERS
#endif
#else
#define LWIP_DHCP_PROVIDE_DNS_SERVERS 0
#endif
/** Option handling: options are parsed in dhcp_parse_reply
* and saved in an array where other functions can load them from.
* This might be moved into the struct dhcp (not necessarily since
@ -117,8 +127,10 @@ enum dhcp_option_idx {
DHCP_OPTION_IDX_T2,
DHCP_OPTION_IDX_SUBNET_MASK,
DHCP_OPTION_IDX_ROUTER,
#if LWIP_DHCP_PROVIDE_DNS_SERVERS
DHCP_OPTION_IDX_DNS_SERVER,
DHCP_OPTION_IDX_DNS_SERVER_LAST = DHCP_OPTION_IDX_DNS_SERVER + DNS_MAX_SERVERS - 1,
DHCP_OPTION_IDX_DNS_SERVER_LAST = DHCP_OPTION_IDX_DNS_SERVER + LWIP_DHCP_PROVIDE_DNS_SERVERS - 1,
#endif /* LWIP_DHCP_PROVIDE_DNS_SERVERS */
#if LWIP_DHCP_GET_NTP_SRV
DHCP_OPTION_IDX_NTP_SERVER,
DHCP_OPTION_IDX_NTP_SERVER_LAST = DHCP_OPTION_IDX_NTP_SERVER + LWIP_DHCP_MAX_NTP_SERVERS - 1,
@ -137,8 +149,10 @@ u8_t dhcp_rx_options_given[DHCP_OPTION_IDX_MAX];
static u8_t dhcp_discover_request_options[] = {
DHCP_OPTION_SUBNET_MASK,
DHCP_OPTION_ROUTER,
DHCP_OPTION_BROADCAST,
DHCP_OPTION_DNS_SERVER
DHCP_OPTION_BROADCAST
#if LWIP_DHCP_PROVIDE_DNS_SERVERS
, DHCP_OPTION_DNS_SERVER
#endif /* LWIP_DHCP_PROVIDE_DNS_SERVERS */
#if LWIP_DHCP_GET_NTP_SRV
, DHCP_OPTION_NTP
#endif /* LWIP_DHCP_GET_NTP_SRV */
@ -574,9 +588,9 @@ dhcp_handle_ack(struct netif *netif)
{
struct dhcp *dhcp = netif_dhcp_data(netif);
#if LWIP_DNS || LWIP_DHCP_GET_NTP_SRV
#if LWIP_DHCP_PROVIDE_DNS_SERVERS || LWIP_DHCP_GET_NTP_SRV
u8_t n;
#endif /* LWIP_DNS || LWIP_DHCP_GET_NTP_SRV */
#endif /* LWIP_DHCP_PROVIDE_DNS_SERVERS || LWIP_DHCP_GET_NTP_SRV */
#if LWIP_DHCP_GET_NTP_SRV
ip4_addr_t ntp_server_addrs[LWIP_DHCP_MAX_NTP_SERVERS];
#endif
@ -642,14 +656,14 @@ dhcp_handle_ack(struct netif *netif)
dhcp_set_ntp_servers(n, ntp_server_addrs);
#endif /* LWIP_DHCP_GET_NTP_SRV */
#if LWIP_DNS
#if LWIP_DHCP_PROVIDE_DNS_SERVERS
/* DNS servers */
for (n = 0; (n < DNS_MAX_SERVERS) && dhcp_option_given(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n); n++) {
for (n = 0; (n < LWIP_DHCP_PROVIDE_DNS_SERVERS) && dhcp_option_given(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n); n++) {
ip_addr_t dns_addr;
ip_addr_set_ip4_u32(&dns_addr, lwip_htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n)));
dns_setserver(n, &dns_addr);
}
#endif /* LWIP_DNS */
#endif /* LWIP_DHCP_PROVIDE_DNS_SERVERS */
}
/**
@ -1519,6 +1533,7 @@ again:
LWIP_ERROR("len >= decode_len", len >= decode_len, return ERR_VAL;);
decode_idx = DHCP_OPTION_IDX_ROUTER;
break;
#if LWIP_DHCP_PROVIDE_DNS_SERVERS
case(DHCP_OPTION_DNS_SERVER):
/* special case: there might be more than one server */
LWIP_ERROR("len %% 4 == 0", len % 4 == 0, return ERR_VAL;);
@ -1527,6 +1542,7 @@ again:
LWIP_ERROR("len >= decode_len", len >= decode_len, return ERR_VAL;);
decode_idx = DHCP_OPTION_IDX_DNS_SERVER;
break;
#endif /* LWIP_DHCP_PROVIDE_DNS_SERVERS */
case(DHCP_OPTION_LEASE_TIME):
LWIP_ERROR("len == 4", len == 4, return ERR_VAL;);
decode_idx = DHCP_OPTION_IDX_LEASE_TIME;

9
src/include/lwip/opt.h
View File

@ -882,6 +882,15 @@
#if !defined LWIP_DHCP_MAX_NTP_SERVERS || defined __DOXYGEN__
#define LWIP_DHCP_MAX_NTP_SERVERS 1
#endif
/**
* LWIP_DHCP_MAX_DNS_SERVERS > 0: Request DNS servers with discover/select.
* DHCP servers received in the response are passed to DNS via @ref dns_setserver()
* (up to the maximum limit defined here).
*/
#if !defined LWIP_DHCP_MAX_DNS_SERVERS || defined __DOXYGEN__
#define LWIP_DHCP_MAX_DNS_SERVERS DNS_MAX_SERVERS
#endif
/**
* @}
*/