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Added non-blocking DNS functionality to network interface 

- Added non-blocking DNS interface to network interface and
  network stack.
- Added caching of DNS replies.
- Added a network stack function to get DNS addresses from stack.
- Added call and call_in hooks to onboard network stack to
  allow calling functions from onboard stack context.
- Added support to call and call_in functions to LWIP and
  Nanostack.
- Disabled LWIP DNS translator with the exception of DNS
  address storage used in DNS address get.
pull/6847/head
Mika Leppänen 2018-04-20 15:29:46 +03:00 committed by Kevin Bracey
parent bad530ab0d
commit b7e8400c2c
18 changed files with 994 additions and 117 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

147
features/FEATURE_LWIP/lwip-interface/LWIPStack.cpp
View File

@ -33,6 +33,7 @@
#include "lwip/dns.h"
#include "lwip/udp.h"
#include "lwip/lwip_errno.h"
#include "lwip-sys/arch/sys_arch.h"
#include "LWIPStack.h"
@ -47,10 +48,10 @@ void LWIP::socket_callback(struct netconn *nc, enum netconn_evt eh, u16_t len)
return;
}
sys_prot_t prot = sys_arch_protect();
LWIP &lwip = LWIP::get_instance();
lwip.adaptation.lock();
for (int i = 0; i < MEMP_NUM_NETCONN; i++) {
if (lwip.arena[i].in_use
&& lwip.arena[i].conn == nc
@ -59,7 +60,7 @@ void LWIP::socket_callback(struct netconn *nc, enum netconn_evt eh, u16_t len)
}
}
sys_arch_unprotect(prot);
lwip.adaptation.unlock();
}
#if !LWIP_IPV4 || !LWIP_IPV6
@ -149,6 +150,7 @@ void LWIP::tcpip_init_irq(void *eh)
{
LWIP *lwip = static_cast<LWIP *>(eh);
lwip->tcpip_inited.release();
sys_tcpip_thread_set();
}
/* LWIP network stack implementation */
@ -173,80 +175,84 @@ LWIP::LWIP()
arena_init();
}
nsapi_error_t LWIP::gethostbyname(const char *host, SocketAddress *address, nsapi_version_t version)
nsapi_error_t LWIP::get_dns_server(int index, SocketAddress *address)
{
ip_addr_t lwip_addr;
#if LWIP_IPV4 && LWIP_IPV6
u8_t addr_type;
if (version == NSAPI_UNSPEC) {
const ip_addr_t *ip_addr = NULL;
if (default_interface) {
ip_addr = get_ip_addr(true, &default_interface->netif);
}
// Prefer IPv6
if (IP_IS_V6(ip_addr)) {
// If IPv4 is available use it as backup
if (get_ipv4_addr(&default_interface->netif)) {
addr_type = NETCONN_DNS_IPV6_IPV4;
} else {
addr_type = NETCONN_DNS_IPV6;
}
// Prefer IPv4
} else {
// If IPv6 is available use it as backup
if (get_ipv6_addr(&default_interface->netif)) {
addr_type = NETCONN_DNS_IPV4_IPV6;
} else {
addr_type = NETCONN_DNS_IPV4;
}
}
} else if (version == NSAPI_IPv4) {
addr_type = NETCONN_DNS_IPV4;
} else if (version == NSAPI_IPv6) {
addr_type = NETCONN_DNS_IPV6;
} else {
return NSAPI_ERROR_DNS_FAILURE;
}
err_t err = netconn_gethostbyname_addrtype(host, &lwip_addr, addr_type);
#elif LWIP_IPV4
if (version != NSAPI_IPv4 && version != NSAPI_UNSPEC) {
return NSAPI_ERROR_DNS_FAILURE;
}
err_t err = netconn_gethostbyname(host, &lwip_addr);
#elif LWIP_IPV6
if (version != NSAPI_IPv6 && version != NSAPI_UNSPEC) {
return NSAPI_ERROR_DNS_FAILURE;
}
err_t err = netconn_gethostbyname(host, &lwip_addr);
#endif
if (err != ERR_OK) {
return NSAPI_ERROR_DNS_FAILURE;
}
int dns_entries = 0;
for (int i = 0; i < DNS_MAX_SERVERS; i++) {
const ip_addr_t *ip_addr = dns_getserver(i);
if (!ip_addr_isany(ip_addr)) {
if (index == dns_entries) {
nsapi_addr_t addr;
convert_lwip_addr_to_mbed(&addr, &lwip_addr);
convert_lwip_addr_to_mbed(&addr, ip_addr);
address->set_addr(addr);
return 0;
return NSAPI_ERROR_OK;
}
dns_entries++;
}
}
return NSAPI_ERROR_NO_ADDRESS;
}
nsapi_error_t LWIP::add_dns_server(const SocketAddress &address)
void LWIP::tcpip_thread_callback(void *ptr)
{
// Shift all dns servers down to give precedence to new server
for (int i = DNS_MAX_SERVERS-1; i > 0; i--) {
dns_setserver(i, dns_getserver(i-1));
lwip_callback *cb = static_cast<lwip_callback *>(ptr);
if (cb->delay) {
sys_timeout(cb->delay, LWIP::tcpip_thread_callback, ptr);
cb->delay = 0;
} else {
cb->callback();
delete cb;
}
}
nsapi_addr_t addr = address.get_addr();
ip_addr_t ip_addr;
if (!convert_mbed_addr_to_lwip(&ip_addr, &addr)) {
return NSAPI_ERROR_PARAMETER;
nsapi_error_t LWIP::call(mbed::Callback<void()> func)
{
return call_in(0, func);
}
dns_setserver(0, &ip_addr);
return 0;
nsapi_error_t LWIP::call_in(int delay, mbed::Callback<void()> func)
{
lwip_callback *cb = new lwip_callback;
if (!cb) {
return NSAPI_ERROR_NO_MEMORY;
}
cb->delay = delay;
cb->callback = func;
if (tcpip_callback_with_block(LWIP::tcpip_thread_callback, cb, 1) != ERR_OK) {
return NSAPI_ERROR_NO_MEMORY;
}
return NSAPI_ERROR_OK;
}
const char *LWIP::get_ip_address()
{
if (!default_interface) {
return NULL;
}
const ip_addr_t *addr = get_ip_addr(true, &default_interface->netif);
if (!addr) {
return NULL;
}
#if LWIP_IPV6
if (IP_IS_V6(addr)) {
return ip6addr_ntoa_r(ip_2_ip6(addr), ip_address, sizeof(ip_address));
}
#endif
#if LWIP_IPV4
if (IP_IS_V4(addr)) {
return ip4addr_ntoa_r(ip_2_ip4(addr), ip_address, sizeof(ip_address));
}
#endif
#if LWIP_IPV6 && LWIP_IPV4
return NULL;
#endif
}
nsapi_error_t LWIP::socket_open(nsapi_socket_t *handle, nsapi_protocol_t proto)
@ -439,6 +445,7 @@ nsapi_size_or_error_t LWIP::socket_sendto(nsapi_socket_t handle, const SocketAdd
}
struct netbuf *buf = netbuf_new();
err_t err = netbuf_ref(buf, data, (u16_t)size);
if (err != ERR_OK) {
netbuf_free(buf);
@ -588,7 +595,7 @@ nsapi_error_t LWIP::setsockopt(nsapi_socket_t handle, int level, int optname, co
member_pair_index = next_free_multicast_member(s, 0);
sys_prot_t prot = sys_arch_protect();
adaptation.lock();
#if LWIP_IPV4
if (IP_IS_V4(&if_addr)) {
@ -601,7 +608,7 @@ nsapi_error_t LWIP::setsockopt(nsapi_socket_t handle, int level, int optname, co
}
#endif
sys_arch_unprotect(prot);
adaptation.unlock();
if (igmp_err == ERR_OK) {
set_multicast_member_registry_bit(s, member_pair_index);
@ -616,7 +623,7 @@ nsapi_error_t LWIP::setsockopt(nsapi_socket_t handle, int level, int optname, co
clear_multicast_member_registry_bit(s, member_pair_index);
s->multicast_memberships_count--;
sys_prot_t prot = sys_arch_protect();
adaptation.lock();
#if LWIP_IPV4
if (IP_IS_V4(&if_addr)) {
@ -629,7 +636,7 @@ nsapi_error_t LWIP::setsockopt(nsapi_socket_t handle, int level, int optname, co
}
#endif
sys_arch_unprotect(prot);
adaptation.unlock();
}
return err_remap(igmp_err);

61
features/FEATURE_LWIP/lwip-interface/LWIPStack.h
View File

@ -198,29 +198,44 @@ public:
*/
nsapi_error_t _add_ppp_interface(void *pcb, bool default_if, LWIP::Interface **interface_out);
/** Translates a hostname to an IP address with specific version
/** Get a domain name server from a list of servers to query
*
* The hostname may be either a domain name or an IP address. If the
* hostname is an IP address, no network transactions will be performed.
*
* If no stack-specific DNS resolution is provided, the hostname
* will be resolve using a UDP socket on the stack.
*
* @param host Hostname to resolve
* @param address Destination for the host SocketAddress
* @param version IP version of address to resolve, NSAPI_UNSPEC indicates
* version is chosen by the stack (defaults to NSAPI_UNSPEC)
* @return 0 on success, negative error code on failure
*/
virtual nsapi_error_t gethostbyname(const char *host,
SocketAddress *address, nsapi_version_t version = NSAPI_UNSPEC);
/** Add a domain name server to list of servers to query
* Returns a DNS server address for a index. If returns error no more
* DNS servers to read.
*
* @param index Index of the DNS server, starts from zero
* @param address Destination for the host address
* @return 0 on success, negative error code on failure
*/
virtual nsapi_error_t add_dns_server(const SocketAddress &address);
virtual nsapi_error_t get_dns_server(int index, SocketAddress *address);
/** Call a callback
*
* Call a callback from the network stack context. If returns error
* callback will not be called.
*
* @param func Callback to be called
* @return 0 on success, negative error code on failure
*/
virtual nsapi_error_t call(mbed::Callback<void()> func);
/** Call a callback after a delay
*
* Call a callback from the network stack context after a delay. If
* returns error callback will not be called.
*
* @param delay Delay in milliseconds
* @param func Callback to be called
* @return 0 on success, negative error code on failure
*/
virtual nsapi_error_t call_in(int delay, mbed::Callback<void()> func);
/** Get the local IP address
*
* @return Null-terminated representation of the local IP address
* or null if not yet connected
*/
virtual const char *get_ip_address();
protected:
LWIP();
@ -439,6 +454,11 @@ private:
uint32_t multicast_memberships_registry;
};
struct lwip_callback {
unsigned int delay;
mbed::Callback<void()> callback;
};
static nsapi_error_t err_remap(err_t err);
static bool is_local_addr(const ip_addr_t *ip_addr);
static const ip_addr_t *get_ip_addr(bool any_addr, const struct netif *netif);
@ -475,9 +495,14 @@ private:
static void socket_callback(struct netconn *nc, enum netconn_evt eh, u16_t len);
static void tcpip_init_irq(void *handle);
static void tcpip_thread_callback(void *ptr);
char ip_address[40];
rtos::Semaphore tcpip_inited;
Interface *default_interface;
LWIPMemoryManager memory_manager;
osThreadId tcpip_thread_id;
rtos::Mutex adaptation;
};
#endif /* LWIPSTACK_H_ */

18
features/FEATURE_LWIP/lwip-interface/lwip-sys/arch/lwip_sys_arch.c
View File

@ -480,6 +480,24 @@ void sys_msleep(u32_t ms) {
osDelay(ms);
}
osThreadId_t lwip_tcpip_thread_id = 0;
bool sys_tcpip_thread_set(void)
{
lwip_tcpip_thread_id = osThreadGetId();
}
bool sys_tcpip_thread_check(void)
{
osThreadId_t thread_id = osThreadGetId();
if (thread_id == lwip_tcpip_thread_id) {
return true;
} else {
return false;
}
}
// Keep a pool of thread structures
static int thread_pool_index = 0;
static sys_thread_data_t thread_pool[SYS_THREAD_POOL_N];

3
features/FEATURE_LWIP/lwip-interface/lwip-sys/arch/sys_arch.h
View File

@ -85,6 +85,9 @@ typedef sys_thread_data_t* sys_thread_t;
// === PROTECTION ===
typedef int sys_prot_t;
bool sys_tcpip_thread_set(void);
bool sys_tcpip_thread_check(void);
#else
#ifdef __cplusplus
extern "C" {

7
features/FEATURE_LWIP/lwip-interface/lwip/src/api/lwip_api_lib.c
View File

@ -102,12 +102,19 @@ netconn_apimsg(tcpip_callback_fn fn, struct api_msg *apimsg)
apimsg->op_completed_sem = LWIP_NETCONN_THREAD_SEM_GET();
#endif /* LWIP_NETCONN_SEM_PER_THREAD */
if (sys_tcpip_thread_check()) {
fn(apimsg);
return ERR_OK;
} else {
err = tcpip_send_msg_wait_sem(fn, apimsg, LWIP_API_MSG_SEM(apimsg));
if (err == ERR_OK) {
return apimsg->err;
}
return err;
}
}
/**
* Create a new netconn (of a specific type) that has a callback function.

13
features/FEATURE_LWIP/lwip-interface/lwip/src/core/lwip_dns.c
View File

@ -283,16 +283,18 @@ static void dns_init_local(void);
static err_t dns_lookup_local(const char *hostname, ip_addr_t *addr LWIP_DNS_ADDRTYPE_ARG(u8_t dns_addrtype));
#endif /* DNS_LOCAL_HOSTLIST */
#if LWIP_FULL_DNS
/* forward declarations */
static void dns_recv(void *s, struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *addr, u16_t port);
static void dns_check_entries(void);
static void dns_call_found(u8_t idx, ip_addr_t* addr);
#endif
/*-----------------------------------------------------------------------------
* Globals
*----------------------------------------------------------------------------*/
#if LWIP_FULL_DNS
/* DNS variables */
static struct udp_pcb *dns_pcbs[DNS_MAX_SOURCE_PORTS];
#if ((LWIP_DNS_SECURE & LWIP_DNS_SECURE_RAND_SRC_PORT) != 0)
@ -301,6 +303,7 @@ static u8_t dns_last_pcb_idx;
static u8_t dns_seqno;
static struct dns_table_entry dns_table[DNS_TABLE_SIZE];
static struct dns_req_entry dns_requests[DNS_MAX_REQUESTS];
#endif
static ip_addr_t dns_servers[DNS_MAX_SERVERS];
#if LWIP_IPV4
@ -324,6 +327,7 @@ dns_init(void)
dns_setserver(0, &dnsserver);
#endif /* DNS_SERVER_ADDRESS */
#if LWIP_FULL_DNS
LWIP_ASSERT("sanity check SIZEOF_DNS_QUERY",
sizeof(struct dns_query) == SIZEOF_DNS_QUERY);
LWIP_ASSERT("sanity check SIZEOF_DNS_ANSWER",
@ -351,6 +355,7 @@ dns_init(void)
#if DNS_LOCAL_HOSTLIST
dns_init_local();
#endif
#endif /* LWIP_FULL_DNS */
}
/**
@ -397,10 +402,14 @@ dns_getserver(u8_t numdns)
void
dns_tmr(void)
{
#if LWIP_FULL_DNS
LWIP_DEBUGF(DNS_DEBUG, ("dns_tmr: dns_check_entries\n"));
dns_check_entries();
#endif
}
#if LWIP_FULL_DNS
#if DNS_LOCAL_HOSTLIST
static void
dns_init_local(void)
@ -1570,4 +1579,6 @@ dns_gethostbyname_addrtype(const char *hostname, ip_addr_t *addr, dns_found_call
LWIP_DNS_ISMDNS_ARG(is_mdns));
}
#endif /* LWIP_FULL_DNS */
#endif /* LWIP_DNS */

9
features/FEATURE_LWIP/lwip-interface/lwip_tools.cpp
View File

@ -157,19 +157,22 @@ void LWIP::arena_init(void)
struct LWIP::mbed_lwip_socket *LWIP::arena_alloc()
{
sys_prot_t prot = sys_arch_protect();
LWIP &lwip = LWIP::get_instance();
lwip.adaptation.lock();
for (int i = 0; i < MEMP_NUM_NETCONN; i++) {
if (!arena[i].in_use) {
struct mbed_lwip_socket *s = &arena[i];
memset(s, 0, sizeof(*s));
s->in_use = true;
sys_arch_unprotect(prot);
lwip.adaptation.unlock();
return s;
}
}
sys_arch_unprotect(prot);
lwip.adaptation.unlock();
return 0;
}

2
features/FEATURE_LWIP/lwip-interface/lwipopts.h
View File

@ -213,6 +213,8 @@
#endif
#define LWIP_DNS 1
// Only DNS address storage is enabled
#define LWIP_FULL_DNS 0
#define LWIP_SOCKET 0
#define SO_REUSE 1

61
features/nanostack/nanostack-interface/Nanostack.cpp
View File

@ -25,6 +25,7 @@
#include "ns_address.h"
#include "nsdynmemLIB.h"
#include "eventOS_scheduler.h"
#include "eventOS_event_timer.h"
#include "randLIB.h"
#include "ip6string.h"
@ -57,6 +58,7 @@ enum socket_mode_t {
SOCKET_MODE_LISTENING, // Socket is listening for connections
};
#define CALL_EVENT 0x12
class NanostackSocket {
public:
@ -444,6 +446,65 @@ void NanostackSocket::event_connection_reset(socket_callback_t *sock_cb)
close();
}
Nanostack::Nanostack()
: call_event_tasklet(-1)
{
}
void Nanostack::call_event_tasklet_main(arm_event_s *event)
{
if (event->event_id == CALL_EVENT) {
nanostack_callback *cb = static_cast<nanostack_callback *>(event->data_ptr);
cb->callback();
delete cb;
}
}
nsapi_error_t Nanostack::call(mbed::Callback<void()> func)
{
return call_in(0, func);
}
nsapi_error_t Nanostack::call_in(int delay, mbed::Callback<void()> func)
{
if (call_event_tasklet < 0) {
call_event_tasklet = eventOS_event_handler_create(&call_event_tasklet_main, 0);
if (call_event_tasklet < 0) {
return NSAPI_ERROR_NO_MEMORY;
}
}
nanostack_callback *cb = new nanostack_callback;
if (!cb) {
return NSAPI_ERROR_NO_MEMORY;
}
cb->callback = func;
arm_event_s event;
event.sender = call_event_tasklet,
event.event_id = CALL_EVENT,
event.receiver = call_event_tasklet,
event.data_ptr = cb;
event.event_type = APPLICATION_EVENT;
event.priority = ARM_LIB_LOW_PRIORITY_EVENT;
if (delay) {
uint32_t ticks = eventOS_event_timer_ms_to_ticks(delay);
if (!eventOS_event_send_in(&event, ticks)) {
return NSAPI_ERROR_NO_MEMORY;
}
} else {
if (eventOS_event_send(&event) < 0) {
return NSAPI_ERROR_NO_MEMORY;
}
}
return NSAPI_ERROR_OK;
}
const char * Nanostack::get_ip_address()
{
NanostackLockGuard lock;

30
features/nanostack/nanostack-interface/Nanostack.h
View File

@ -23,6 +23,7 @@
#include "NanostackMemoryManager.h"
#include "MeshInterface.h"
#include "mesh_interface_types.h"
#include "eventOS_event.h"
struct ns_address;
@ -43,8 +44,31 @@ public:
/* Local variant with stronger typing and manual address specification */
nsapi_error_t add_ethernet_interface(EMAC &emac, bool default_if, Nanostack::EthernetInterface **interface_out, const uint8_t *mac_addr = NULL);
/** Call a callback
*
* Call a callback from the network stack context. If returns error
* callback will not be called.
*
* @param func Callback to be called
* @return 0 on success, negative error code on failure
*/
virtual nsapi_error_t call(mbed::Callback<void()> func);
/** Call a callback after a delay
*
* Call a callback from the network stack context after a delay. If
* returns error callback will not be called.
*
* @param delay Delay in milliseconds
* @param func Callback to be called
* @return 0 on success, negative error code on failure
*/
virtual nsapi_error_t call_in(int delay, mbed::Callback<void()> func);
protected:
Nanostack();
/** Get the local IP address
*
* @return Null-terminated representation of the local IP address
@ -242,9 +266,15 @@ protected:
virtual nsapi_error_t getsockopt(void *handle, int level, int optname, void *optval, unsigned *optlen);
private:
struct nanostack_callback {
mbed::Callback<void()> callback;
};
nsapi_size_or_error_t do_sendto(void *handle, const struct ns_address *address, const void *data, nsapi_size_t size);
static void call_event_tasklet_main(arm_event_s *event);
char text_ip_address[40];
NanostackMemoryManager memory_manager;
int8_t call_event_tasklet;
};
nsapi_error_t map_mesh_error(mesh_error_t err);

5
features/netsocket/NetworkInterface.cpp
View File

@ -60,6 +60,11 @@ nsapi_error_t NetworkInterface::gethostbyname(const char *name, SocketAddress *a
return get_stack()->gethostbyname(name, address, version);
}
nsapi_error_t NetworkInterface::gethostbyname_async(const char *host, hostbyname_cb_t callback, void *data, nsapi_version_t version)
{
return get_stack()->gethostbyname_async(host, callback, data, version);
}
nsapi_error_t NetworkInterface::add_dns_server(const SocketAddress &address)
{
return get_stack()->add_dns_server(address);

32
features/netsocket/NetworkInterface.h
View File

@ -127,6 +127,38 @@ public:
virtual nsapi_error_t gethostbyname(const char *host,
SocketAddress *address, nsapi_version_t version = NSAPI_UNSPEC);
/** Hostname translation callback (asynchronous)
*
* Callback will be called after DNS resolution completes or a failure
* occurs.
*
* @param status 0 on success, negative error code on failure
* @param address On success, destination for the host SocketAddress
* @param data Caller defined data
*/
typedef mbed::Callback<void (nsapi_error_t result, SocketAddress *address, void *data)> hostbyname_cb_t;
/** Translates a hostname to an IP address (asynchronous)
*
* The hostname may be either a domain name or an IP address. If the
* hostname is an IP address, no network transactions will be performed.
*
* If no stack-specific DNS resolution is provided, the hostname
* will be resolve using a UDP socket on the stack.
*
* Call is non-blocking. Result of the DNS operation is returned by the callback.
* If this function returns failure, callback will not be called.
*
* @param host Hostname to resolve
* @param callback Callback that is called for result
* @param data Caller defined data returned in callback
* @param version IP version of address to resolve, NSAPI_UNSPEC indicates
* version is chosen by the stack (defaults to NSAPI_UNSPEC)
* @return 0 on success, negative error code on failure
*/
virtual nsapi_error_t gethostbyname_async(const char *host, hostbyname_cb_t callback, void *data,
nsapi_version_t version = NSAPI_UNSPEC);
/** Add a domain name server to list of servers to query
*
* @param address Destination for the host address

30
features/netsocket/NetworkStack.cpp
View File

@ -49,11 +49,41 @@ nsapi_error_t NetworkStack::gethostbyname(const char *name, SocketAddress *addre
return nsapi_dns_query(this, name, address, version);
}
nsapi_error_t NetworkStack::gethostbyname_async(const char *name, hostbyname_cb_t callback, void *data, nsapi_version_t version)
{
SocketAddress address;
// check for simple ip addresses
if (address.set_ip_address(name)) {
if (version != NSAPI_UNSPEC && address.get_ip_version() != version) {
return NSAPI_ERROR_DNS_FAILURE;
}
return NSAPI_ERROR_OK;
}
// if the version is unspecified, try to guess the version from the
// ip address of the underlying stack
if (version == NSAPI_UNSPEC) {
SocketAddress testaddress;
if (testaddress.set_ip_address(this->get_ip_address())) {
version = testaddress.get_ip_version();
}
}
return nsapi_dns_query_async(this, name, callback, data, version);
}
nsapi_error_t NetworkStack::add_dns_server(const SocketAddress &address)
{
return nsapi_dns_add_server(address);
}
nsapi_error_t NetworkStack::get_dns_server(int index, SocketAddress *address)
{
return NSAPI_ERROR_UNSUPPORTED;
}
nsapi_error_t NetworkStack::setstackopt(int level, int optname, const void *optval, unsigned optlen)
{
return NSAPI_ERROR_UNSUPPORTED;

51
features/netsocket/NetworkStack.h
View File

@ -22,6 +22,8 @@
#include "netsocket/SocketAddress.h"
#include "netsocket/NetworkInterface.h"
// Predeclared classes
class OnboardNetworkStack;
/** NetworkStack class
*
@ -37,13 +39,10 @@ public:
virtual ~NetworkStack() {};
/** Get the local IP address
* @deprecated
*
* @return Null-terminated representation of the local IP address
* or null if not yet connected
*/
MBED_DEPRECATED_SINCE("mbed-os-5.7",
"Use NetworkInterface::get_ip_address()")
virtual const char *get_ip_address();
/** Translates a hostname to an IP address with specific version
@ -63,6 +62,38 @@ public:
virtual nsapi_error_t gethostbyname(const char *host,
SocketAddress *address, nsapi_version_t version = NSAPI_UNSPEC);
/** Hostname translation callback (asynchronous)
*
* Callback will be called after DNS resolution completes or a failure
* occurs.
*
* @param status 0 on success, negative error code on failure
* @param address On success, destination for the host SocketAddress
* @param data Caller defined data
*/
typedef mbed::Callback<void (nsapi_error_t result, SocketAddress *address, void *data)> hostbyname_cb_t;
/** Translates a hostname to an IP address (asynchronous)
*
* The hostname may be either a domain name or an IP address. If the
* hostname is an IP address, no network transactions will be performed.
*
* If no stack-specific DNS resolution is provided, the hostname
* will be resolve using a UDP socket on the stack.
*
* Call is non-blocking. Result of the DNS operation is returned by the callback.
* If this function returns failure, callback will not be called.
*
* @param host Hostname to resolve
* @param callback Callback that is called for result
* @param data Caller defined data returned in callback
* @param version IP version of address to resolve, NSAPI_UNSPEC indicates
* version is chosen by the stack (defaults to NSAPI_UNSPEC)
* @return 0 on success, negative error code on failure
*/
virtual nsapi_error_t gethostbyname_async(const char *host, hostbyname_cb_t callback, void *data,
nsapi_version_t version = NSAPI_UNSPEC);
/** Add a domain name server to list of servers to query
*
* @param address Destination for the host address
@ -70,6 +101,17 @@ public:
*/
virtual nsapi_error_t add_dns_server(const SocketAddress &address);
/** Get a domain name server from a list of servers to query
*
* Returns a DNS server address for a index. If returns error no more
* DNS servers to read.
*
* @param index Index of the DNS server, starts from zero
* @param address Destination for the host address
* @return 0 on success, negative error code on failure
*/
virtual nsapi_error_t get_dns_server(int index, SocketAddress *address);
/* Set stack options
*
* setstackopt allows an application to pass stack-specific options
@ -101,6 +143,9 @@ public:
*/
virtual nsapi_error_t getstackopt(int level, int optname, void *optval, unsigned *optlen);
/** Dynamic downcast to a OnboardNetworkStack */
virtual OnboardNetworkStack *onboardNetworkStack() { return 0; }
protected:
friend class Socket;
friend class UDPSocket;

22
features/netsocket/OnboardNetworkStack.h
View File

@ -39,6 +39,8 @@ public:
*/
static OnboardNetworkStack &get_default_instance();
virtual OnboardNetworkStack *onboardNetworkStack() { return this; }
/** Representation of a stack's view of an interface.
*
* Provides facilities required by a driver to implement the application
@ -121,6 +123,26 @@ public:
virtual char *get_gateway(char *buf, nsapi_size_t buflen) = 0;
};
/** Call a callback
*
* Call a callback from the network stack context. If returns error
* callback will not be called.
*
* @param func Callback to be called
* @return 0 on success, negative error code on failure
*/
virtual nsapi_error_t call(mbed::Callback<void()> func) = 0;
/** Call a callback after a delay
*
* Call a callback from the network stack context after a delay. If
* returns error callback will not be called.
*
* @param delay Delay in milliseconds
* @param func Callback to be called
* @return 0 on success, negative error code on failure
*/
virtual nsapi_error_t call_in(int delay, mbed::Callback<void()> func) = 0;
/** Register a network interface with the IP stack
*

576
features/netsocket/nsapi_dns.cpp
View File

@ -19,6 +19,10 @@
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include "mbed_shared_queues.h"
#include "EventQueue.h"
#include "OnboardNetworkStack.h"
#include "Kernel.h"
#define CLASS_IN 1
@ -29,8 +33,51 @@
#define DNS_BUFFER_SIZE 512
#define DNS_TIMEOUT 5000
#define DNS_SERVERS_SIZE 5
#define DNS_RESPONSE_MIN_SIZE 12
#define DNS_MAX_TTL 604800
#define DNS_CACHE_SIZE 3
#define DNS_STACK_SERVERS_NUM 5
#define DNS_QUERY_QUEUE_SIZE 5
nsapi_addr_t dns_servers[DNS_SERVERS_SIZE] = {
struct DNS_CACHE {
SocketAddress address;
char host[128];
uint64_t expires; /*!< time to live in milliseconds */
uint64_t accessed; /*!< last accessed */
};
struct DNS_QUERY {
int unique_id;
NetworkStack *stack;
char host[128];
NetworkStack::hostbyname_cb_t callback;
void *cb_data;
nsapi_size_t addr_count;
nsapi_version_t version;
UDPSocket *socket;
int dns_server;
int retries;
int dns_message_id;
};
typedef nsapi_error_t (*nsapi_dns_call_t)(mbed::Callback<void()> func);
typedef nsapi_error_t (*nsapi_dns_call_in_t)(int delay, mbed::Callback<void()> func);
static void nsapi_dns_cache_add(const char *host, SocketAddress *address, uint32_t ttl);
static nsapi_size_or_error_t nsapi_dns_cache_find(const char *host, nsapi_version_t version, SocketAddress *address);
static nsapi_error_t nsapi_dns_get_server_addr(NetworkStack *stack, int *index, SocketAddress *dns_addr);
static void nsapi_dns_query_async_create(DNS_QUERY *query);
static void nsapi_dns_query_async_send(void *ptr);
static void nsapi_dns_query_async_resp(DNS_QUERY *query, nsapi_error_t status, SocketAddress *address);
static void nsapi_dns_query_async_socket_callback(NetworkStack *stack);
static void nsapi_dns_query_async_socket_callback_handle(NetworkStack *stack);
static nsapi_error_t nsapi_dns_call_default(mbed::Callback<void()> func);
static nsapi_error_t nsapi_dns_call_in_default(int delay, mbed::Callback<void()> func);
static nsapi_addr_t dns_servers[DNS_SERVERS_SIZE] = {
{NSAPI_IPv4, {8, 8, 8, 8}}, // Google
{NSAPI_IPv4, {209, 244, 0, 3}}, // Level 3
{NSAPI_IPv4, {84, 200, 69, 80}}, // DNS.WATCH
@ -40,6 +87,14 @@ nsapi_addr_t dns_servers[DNS_SERVERS_SIZE] = {
0,0, 0,0, 0x1c,0x04, 0xb1,0x2f}},
};
static DNS_CACHE *dns_cache[DNS_CACHE_SIZE];
static uint16_t dns_message_id = 0;
static int dns_unique_id = 0;
static DNS_QUERY *dns_query_queue[DNS_QUERY_QUEUE_SIZE];
static rtos::Mutex dns_cache_mutex;
static nsapi_dns_call_t dns_call = nsapi_dns_call_default;
static nsapi_dns_call_in_t dns_call_in = nsapi_dns_call_in_default;
// DNS server configuration
extern "C" nsapi_error_t nsapi_dns_add_server(nsapi_addr_t addr)
{
@ -83,11 +138,23 @@ static uint16_t dns_scan_word(const uint8_t **p)
return (a << 8) | b;
}
static void dns_append_question(uint8_t **p, const char *host, nsapi_version_t version)
static uint32_t dns_scan_word32(const uint8_t **p)
{
uint32_t value = dns_scan_byte(p) << 24;
value |= dns_scan_byte(p) << 16;
value |= dns_scan_byte(p) << 8;
value |= dns_scan_byte(p);
return value;
}
static int dns_append_question(uint8_t *ptr, uint16_t id, const char *host, nsapi_version_t version)
{
uint8_t *s_ptr = ptr;
uint8_t **p = &ptr;
// fill the header
dns_append_word(p, 1); // id = 1
dns_append_word(p, id); // id = 1
dns_append_word(p, 0x0100); // flags = recursion required
dns_append_word(p, 1); // qdcount = 1
dns_append_word(p, 0); // ancount = 0
@ -110,10 +177,14 @@ static void dns_append_question(uint8_t **p, const char *host, nsapi_version_t v
dns_append_word(p, RR_AAAA); // qtype = ipv6
}
dns_append_word(p, CLASS_IN);
return *p - s_ptr;
}
static int dns_scan_response(const uint8_t **p, nsapi_addr_t *addr, unsigned addr_count)
static int dns_scan_response(const uint8_t *ptr, uint16_t exp_id, uint32_t *ttl, nsapi_addr_t *addr, unsigned addr_count)
{
const uint8_t **p = &ptr;
// scan header
uint16_t id = dns_scan_word(p);
uint16_t flags = dns_scan_word(p);
@ -127,7 +198,7 @@ static int dns_scan_response(const uint8_t **p, nsapi_addr_t *addr, unsigned add
dns_scan_word(p); // arcount
// verify header is response to query
if (!(id == 1 && qr && opcode == 0 && rcode == 0)) {
if (!(id == exp_id && qr && opcode == 0 && rcode == 0)) {
return 0;
}
@ -164,9 +235,17 @@ static int dns_scan_response(const uint8_t **p, nsapi_addr_t *addr, unsigned add
uint16_t rtype = dns_scan_word(p); // rtype
uint16_t rclass = dns_scan_word(p); // rclass
*p += 4; // ttl
uint32_t ttl_val = dns_scan_word32(p); // ttl
uint16_t rdlength = dns_scan_word(p); // rdlength
if (i == 0) {
// Is interested only on first address that is stored to cache
if (ttl_val > DNS_MAX_TTL) {
ttl_val = DNS_MAX_TTL;
}
*ttl = ttl_val;
}
if (rtype == RR_A && rclass == CLASS_IN && rdlength == NSAPI_IPv4_BYTES) {
// accept A record
addr->version = NSAPI_IPv4;
@ -194,6 +273,109 @@ static int dns_scan_response(const uint8_t **p, nsapi_addr_t *addr, unsigned add
return count;
}
static void nsapi_dns_cache_add(const char *host, SocketAddress *address, uint32_t ttl)
{
// RFC 1034: if TTL is zero, entry is not added to cache
if (!ttl) {
return;
}
// Checks if already cached
if (nsapi_dns_cache_find(host, address->get_ip_version(), NULL) == NSAPI_ERROR_OK) {
return;
}
dns_cache_mutex.lock();
int index = -1;
uint64_t accessed = -1;
// Finds free or last accessed entry
for (int i = 0; i < DNS_CACHE_SIZE; i++) {
if (!dns_cache[i]) {
index = i;
break;
} else if (dns_cache[i]->accessed <= accessed) {
accessed = dns_cache[i]->accessed;
index = i;
}
}
if (index < 0) {
return;
}
// Allocates in case entry is free, otherwise reuses
if (!dns_cache[index]) {
dns_cache[index] = new DNS_CACHE;
}
if (dns_cache[index]) {
dns_cache[index]->address = *address;
strncpy(dns_cache[index]->host, host, 127);
uint64_t ms_count = rtos::Kernel::get_ms_count();
dns_cache[index]->expires = ms_count + ttl * 1000;
dns_cache[index]->accessed = ms_count;
}
dns_cache_mutex.unlock();
}
static nsapi_error_t nsapi_dns_cache_find(const char *host, nsapi_version_t version, SocketAddress *address)
{
nsapi_error_t ret_val = NSAPI_ERROR_NO_ADDRESS;
dns_cache_mutex.lock();
for (int i = 0; i < DNS_CACHE_SIZE; i++) {
if (dns_cache[i]) {
uint64_t ms_count = rtos::Kernel::get_ms_count();
// Checks all entries for expired entries
if (ms_count > dns_cache[i]->expires) {
delete dns_cache[i];
dns_cache[i] = NULL;
} else if (((version == NSAPI_UNSPEC) || (version == dns_cache[i]->address.get_ip_version())) &&
(strncmp(dns_cache[i]->host, host, 127) == 0)) {
if (address) {
*address = dns_cache[i]->address;
}
dns_cache[i]->accessed = ms_count;
ret_val = NSAPI_ERROR_OK;
}
}
}
dns_cache_mutex.unlock();
return ret_val;
}
static nsapi_error_t nsapi_dns_get_server_addr(NetworkStack *stack, int *index, SocketAddress *dns_addr)
{
bool dns_addr_set = false;
if (*index >= DNS_SERVERS_SIZE + DNS_STACK_SERVERS_NUM) {
return NSAPI_ERROR_NO_ADDRESS;
}
if (*index < DNS_STACK_SERVERS_NUM) {
nsapi_error_t ret = stack->get_dns_server(*index, dns_addr);
if (ret < 0) {
*index = DNS_STACK_SERVERS_NUM;
} else {
dns_addr_set = true;
}
}
if (!dns_addr_set) {
dns_addr->set_addr(dns_servers[*index - DNS_STACK_SERVERS_NUM]);
}
dns_addr->set_port(53);
return NSAPI_ERROR_OK;
}
// core query function
static nsapi_size_or_error_t nsapi_dns_query_multiple(NetworkStack *stack, const char *host,
nsapi_addr_t *addr, unsigned addr_count, nsapi_version_t version)
@ -204,6 +386,13 @@ static nsapi_size_or_error_t nsapi_dns_query_multiple(NetworkStack *stack, const
return NSAPI_ERROR_PARAMETER;
}
// check cache
SocketAddress address;
if (nsapi_dns_cache_find(host, version, &address) == NSAPI_ERROR_OK) {
*addr = address.get_addr();
return 1;
}
// create a udp socket
UDPSocket socket;
int err = socket.open(stack);
@ -221,21 +410,41 @@ static nsapi_size_or_error_t nsapi_dns_query_multiple(NetworkStack *stack, const
nsapi_size_or_error_t result = NSAPI_ERROR_DNS_FAILURE;
// check against each dns server
for (unsigned i = 0; i < DNS_SERVERS_SIZE; i++) {
// send the question
uint8_t *question = packet;
dns_append_question(&question, host, version);
bool retry = false;
err = socket.sendto(SocketAddress(dns_servers[i], 53), packet, question - packet);
int index = 0;
// check against each dns server
while (true) {
SocketAddress dns_addr;
err = nsapi_dns_get_server_addr(stack, &index, &dns_addr);
if (err != NSAPI_ERROR_OK) {
break;
}
// send the question
int len = dns_append_question(packet, 1, host, version);
err = socket.sendto(dns_addr, packet, len);
// send may fail for various reasons, including wrong address type - move on
if (err < 0) {
// goes to next dns server
retry = false;
index++;
continue;
}
// recv the response
err = socket.recvfrom(NULL, packet, DNS_BUFFER_SIZE);
if (err == NSAPI_ERROR_WOULD_BLOCK) {
if (!retry) {
// retries once
retry = true;
} else {
// goes to next dns server
retry = false;
index++;
}
continue;
} else if (err < 0) {
result = err;
@ -243,8 +452,13 @@ static nsapi_size_or_error_t nsapi_dns_query_multiple(NetworkStack *stack, const
}
const uint8_t *response = packet;
int count = dns_scan_response(&response, addr, addr_count);
uint32_t ttl;
int count = dns_scan_response(response, 1, &ttl, addr, addr_count);
if (count > 0) {
// Adds address to cache
SocketAddress address(*addr);
nsapi_dns_cache_add(host, &address, ttl);
result = count;
}
@ -305,3 +519,337 @@ nsapi_error_t nsapi_dns_query(NetworkStack *stack, const char *host,
address->set_addr(addr);
return (nsapi_error_t)((result > 0) ? 0 : result);
}
nsapi_error_t nsapi_dns_query_async(NetworkStack *stack, const char *host,
NetworkStack::hostbyname_cb_t callback, void *data, nsapi_version_t version)
{
nsapi_size_or_error_t result = nsapi_dns_query_multiple_async(stack, host, callback, data, 1, version);
return (nsapi_error_t)((result > 0) ? 0 : result);
}
static nsapi_error_t nsapi_dns_call_default(mbed::Callback<void()> func)
{
events::EventQueue *event_queue = mbed::mbed_event_queue();
if (!event_queue) {
return NSAPI_ERROR_NO_MEMORY;
}
if (event_queue->call(func) == 0) {
return NSAPI_ERROR_NO_MEMORY;
}
return NSAPI_ERROR_OK ;
}
static nsapi_error_t nsapi_dns_call_in_default(int delay, mbed::Callback<void()> func)
{
events::EventQueue *event_queue = mbed::mbed_event_queue();
if (!event_queue) {
return NSAPI_ERROR_NO_MEMORY;
}
if (event_queue->call_in(delay, func) == 0) {
return NSAPI_ERROR_NO_MEMORY;
}
return NSAPI_ERROR_OK ;
}
void nsapi_dns_call_set(nsapi_dns_call_t callback)
{
dns_call = callback;
}
void nsapi_dns_call_in_set(nsapi_dns_call_in_t callback)
{
dns_call_in = callback;
}
static nsapi_error_t nsapi_dns_call(NetworkStack *stack, mbed::Callback<void()> func)
{
if (stack->onboardNetworkStack()) {
OnboardNetworkStack *onboard_stack = reinterpret_cast<OnboardNetworkStack *>(stack);
return onboard_stack->call(func);
} else {
dns_call(func);
}
return NSAPI_ERROR_OK;
}
static nsapi_error_t nsapi_dns_call_in(NetworkStack *stack, int delay, mbed::Callback<void()> func)
{
if (stack->onboardNetworkStack()) {
OnboardNetworkStack *onboard_stack = reinterpret_cast<OnboardNetworkStack *>(stack);
return onboard_stack->call_in(delay, func);
} else {
dns_call_in(delay, func);
}
return NSAPI_ERROR_OK;
}
nsapi_error_t nsapi_dns_query_multiple_async(NetworkStack *stack, const char *host,
NetworkStack::hostbyname_cb_t callback, void *data, nsapi_size_t addr_count, nsapi_version_t version)
{
if (!stack) {
return NSAPI_ERROR_PARAMETER;
}
// check for valid host name
int host_len = host ? strlen(host) : 0;
if (host_len > 128 || host_len == 0) {
return NSAPI_ERROR_PARAMETER;
}
DNS_QUERY *query = new DNS_QUERY;
if (!query) {
return NSAPI_ERROR_NO_MEMORY;
}
query->unique_id = 0;
strcpy(query->host, host);
query->callback = callback;
query->cb_data = data;
query->stack = stack;
query->addr_count = addr_count;
query->version = version;
query->socket = NULL;
query->dns_server = 0;
query->retries = 2;
query->dns_message_id = -1;
if (nsapi_dns_call(stack, mbed::callback(nsapi_dns_query_async_create, query)) != NSAPI_ERROR_OK) {
delete query;
return NSAPI_ERROR_NO_MEMORY;
}
return NSAPI_ERROR_IN_PROGRESS ;
}
static void nsapi_dns_query_async_create(DNS_QUERY *query)
{
SocketAddress address;
if (nsapi_dns_cache_find(query->host, query->version, &address) == NSAPI_ERROR_OK) {
nsapi_dns_query_async_resp(query, NSAPI_ERROR_OK, &address);
return;
}
int index = -1;
for (int i = 0; i < DNS_QUERY_QUEUE_SIZE; i++) {
if (dns_query_queue[i]) {
if (dns_query_queue[i]->stack == query->stack) {
query->socket = dns_query_queue[i]->socket;
}
} else if (index < 0) {
index = i;
}
}
if (index < 0) {
nsapi_dns_query_async_resp(query, NSAPI_ERROR_NO_MEMORY, NULL);
return;
}
UDPSocket *socket;
if (query->socket) {
socket = query->socket;
} else {
socket = new UDPSocket;
if (!socket) {
nsapi_dns_query_async_resp(query, NSAPI_ERROR_NO_MEMORY, NULL);
return;
}
int err = socket->open(query->stack);
if (err) {
delete socket;
nsapi_dns_query_async_resp(query, err, NULL);
return;
}
socket->set_timeout(0);
socket->sigio(mbed::callback(nsapi_dns_query_async_socket_callback, query->stack));
query->socket = socket;
}
query->unique_id = dns_unique_id++;
dns_query_queue[index] = query;
nsapi_dns_query_async_send(reinterpret_cast<void *>(query->unique_id));
}
static void nsapi_dns_query_async_delete(DNS_QUERY *query)
{
int index = -1;
bool close_socket = true;
for (int i = 0; i < DNS_QUERY_QUEUE_SIZE; i++) {
if (dns_query_queue[i]) {
if (dns_query_queue[i] == query) {
index = i;
} else if (dns_query_queue[i]->stack == query->stack) {
close_socket = false;
}
}
}
if (index < 0) {
return;
}
if (close_socket) {
query->socket->close();
delete query->socket;
}
dns_query_queue[index] = NULL;
delete query;
}
static void nsapi_dns_query_async_resp(DNS_QUERY *query, nsapi_error_t status, SocketAddress *address)
{
query->callback(status, address, query->cb_data);
nsapi_dns_query_async_delete(query);
}
static void nsapi_dns_query_async_send(void *ptr)
{
int unique_id = reinterpret_cast<int>(ptr);
DNS_QUERY *query = NULL;
for (int i = 0; i < DNS_QUERY_QUEUE_SIZE; i++) {
if (dns_query_queue[i] && dns_query_queue[i]->unique_id == unique_id) {
query = dns_query_queue[i];
break;
}
}
if (!query) {
nsapi_dns_query_async_resp(query, NSAPI_ERROR_NO_MEMORY, NULL);
return;
}
if (query->retries) {
query->retries--;
} else {
query->dns_server++;
query->retries = 1;
}
query->dns_message_id = dns_message_id++;
// create network packet
uint8_t *packet = (uint8_t *)malloc(DNS_BUFFER_SIZE);
if (!packet) {
nsapi_dns_query_async_resp(query, NSAPI_ERROR_NO_MEMORY, NULL);
return;
}
// send the question
int len = dns_append_question(packet, query->dns_message_id, query->host, query->version);
while (true) {
SocketAddress dns_addr;
nsapi_size_or_error_t err = nsapi_dns_get_server_addr(query->stack, &(query->dns_server), &dns_addr);
if (err != NSAPI_ERROR_OK) {
nsapi_dns_query_async_resp(query, NSAPI_ERROR_DNS_FAILURE, NULL);
free(packet);
return;
}
err = query->socket->sendto(dns_addr, packet, len);
if (err < 0) {
query->dns_server++;
} else {
break;
}
}
free(packet);
if (nsapi_dns_call_in(query->stack, DNS_TIMEOUT,
mbed::callback(nsapi_dns_query_async_send, reinterpret_cast<void *>(unique_id))) != NSAPI_ERROR_OK) {
nsapi_dns_query_async_resp(query, NSAPI_ERROR_NO_MEMORY, NULL);
}
}
static void nsapi_dns_query_async_socket_callback(NetworkStack *stack)
{
nsapi_dns_call(stack, mbed::callback(nsapi_dns_query_async_socket_callback_handle, stack));
}
static void nsapi_dns_query_async_socket_callback_handle(NetworkStack *stack)
{
UDPSocket *socket = NULL;
for (int i = 0; i < DNS_QUERY_QUEUE_SIZE; i++) {
if (dns_query_queue[i] && dns_query_queue[i]->stack == stack) {
socket = dns_query_queue[i]->socket;
break;
}
}
if (socket) {
// create network packet
uint8_t *packet = (uint8_t *)malloc(DNS_BUFFER_SIZE);
if (!packet) {
return;
}
// recv the response
nsapi_size_or_error_t size = socket->recvfrom(NULL, packet, DNS_BUFFER_SIZE);
if (size < DNS_RESPONSE_MIN_SIZE) {
free(packet);
return;
}
// gets id from response to associate with correct query
uint16_t id = (*packet << 8) | *(packet + 1);
DNS_QUERY *query = NULL;
for (int i = 0; i < DNS_QUERY_QUEUE_SIZE; i++) {
if (dns_query_queue[i] && dns_query_queue[i]->dns_message_id == id) {
query = dns_query_queue[i];
break;
}
}
if (!query) {
free(packet);
return;
}
nsapi_addr_t *addrs = new nsapi_addr_t[query->addr_count];
uint32_t ttl;
int count = dns_scan_response((const uint8_t *) packet, id, &ttl, addrs, query->addr_count);
free(packet);
if (count > 0) {
SocketAddress *addresses = new SocketAddress[count];
for (int i = 0; i < count; i++) {
addresses[i].set_addr(addrs[i]);
}
// Adds address to cache
nsapi_dns_cache_add(query->host, addresses, ttl);
nsapi_dns_query_async_resp(query, NSAPI_ERROR_OK, addresses);
delete[] addresses;
} else {
nsapi_dns_query_async_resp(query, NSAPI_ERROR_DNS_FAILURE, NULL);
}
delete[] addrs;
}
}

28
features/netsocket/nsapi_dns.h
View File

@ -77,6 +77,19 @@ nsapi_error_t nsapi_dns_query(NetworkStack *stack, const char *host,
SocketAddress *addr, nsapi_version_t version = NSAPI_IPv4);
/** Query a domain name server for an IP address of a given hostname
*
* @param stack Network stack as target for DNS query
* @param host Hostname to resolve
* @param callback Callback that is called for result*
* @param data Caller defined data returned in callback
* @param version IP version to resolve (defaults to NSAPI_IPv4)
* @return 0 on success, negative error code on failure
* NSAPI_ERROR_DNS_FAILURE indicates the host could not be found
*/
nsapi_error_t nsapi_dns_query_async(NetworkStack *stack, const char *host,
NetworkStack::hostbyname_cb_t callback, void *data, nsapi_version_t version = NSAPI_IPv4);
/** Query a domain name server for an IP address of a given hostname (asynchronous)
*
* @param stack Network stack as target for DNS query
* @param host Hostname to resolve
@ -117,6 +130,20 @@ nsapi_error_t nsapi_dns_query(S *stack, const char *host,
nsapi_size_or_error_t nsapi_dns_query_multiple(NetworkStack *stack, const char *host,
SocketAddress *addr, nsapi_size_t addr_count, nsapi_version_t version = NSAPI_IPv4);
/** Query a domain name server for an IP address of a given hostname (asynchronous)
*
* @param stack Network stack as target for DNS query
* @param host Hostname to resolve
* @param callback Callback that is called for result
* @param data Caller defined data returned in callback
* @param addr_count Number of addresses allocated in the array
* @param version IP version to resolve (defaults to NSAPI_IPv4)
* @return 0 on success, negative error code on failure
* NSAPI_ERROR_DNS_FAILURE indicates the host could not be found
*/
nsapi_size_or_error_t nsapi_dns_query_multiple_async(NetworkStack *stack, const char *host,
NetworkStack::hostbyname_cb_t callback, void *data, nsapi_size_t addr_count, nsapi_version_t version = NSAPI_IPv4);
/** Query a domain name server for multiple IP address of a given hostname
*
* @param stack Network stack as target for DNS query
@ -130,6 +157,7 @@ nsapi_size_or_error_t nsapi_dns_query_multiple(NetworkStack *stack, const char *
extern "C" nsapi_size_or_error_t nsapi_dns_query_multiple(nsapi_stack_t *stack, const char *host,
nsapi_addr_t *addr, nsapi_size_t addr_count, nsapi_version_t version = NSAPI_IPv4);
/** Query a domain name server for multiple IP address of a given hostname
*
* @param stack Network stack as target for DNS query