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Added sequential dns resolver function for netconn api (netconn_gethostbyname)

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goldsimon
2007-11-16 17:16:17 +00:00
parent 7e447c83fb
commit e2cd201f6a
5 changed files with 112 additions and 0 deletions
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54
src/api/api_msg.c
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@@ -50,6 +50,7 @@
#include "lwip/memp.h"
#include "lwip/tcpip.h"
#include "lwip/igmp.h"
#include "lwip/dns.h"
/* forward declarations */
#if LWIP_TCP
@@ -989,5 +990,58 @@ do_join_leave_group(struct api_msg_msg *msg)
}
#endif /* LWIP_IGMP */
#if LWIP_DNS
/**
* Callback function that is called when DNS name is resolved
* (or on timeout).
*/
static void
do_dns_found(const char *name, struct ip_addr *ipaddr, void *arg)
{
struct dns_api_msg *msg = (struct dns_api_msg*)arg;
LWIP_ASSERT("DNS response for wrong host name", strcmp(msg->name, name) == 0);
if (ipaddr == NULL) {
/* timeout or memory error */
*msg->err = ERR_VAL;
} else {
/* address was resolved */
*msg->err = ERR_OK;
*msg->addr = *ipaddr;
}
/* wake up the application task waiting in netconn_gethostbyname */
sys_sem_signal(msg->sem);
}
/**
* Execute a DNS query
* Called from netconn_gethostbyname
*
* @param msg the dns_api_msg pointing to the query
*/
void
do_gethostbyname(void *arg)
{
DNS_RESULT res;
struct dns_api_msg *msg = (struct dns_api_msg*)arg;
res = dns_gethostbyname(msg->name, msg->addr, do_dns_found, msg);
if (res != DNS_QUERY_QUEUED) {
/* If not queued, return to app thread directly */
if (res == DNS_QUERY_INVALID) {
/* some error occurred */
*msg->err = ERR_ARG;
} else if (res == DNS_COMPLETE) {
/* name was already in octet notation or cached */
*msg->err = ERR_OK;
}
/* on error or immediate success, wake up the application
* task waiting in netconn_gethostbyname */
sys_sem_signal(msg->sem);
}
}
#endif /* LWIP_DNS */
#endif /* LWIP_NETCONN */