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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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36
src/api/api_lib.c
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@@ -566,4 +566,40 @@ netconn_join_leave_group(struct netconn *conn,
}
#endif /* LWIP_IGMP */
#if LWIP_DNS
/**
* Execute a DNS query, only one IP address is returned
*
* @param name a string representation of the DNS host name to query
* @param addr a preallocated struct ip_addr where to store the resolved IP address
* @return an error returned by the dns module, ERR_OK if resolving succeeded
*/
err_t
netconn_gethostbyname(const char *name, struct ip_addr *addr)
{
struct dns_api_msg msg;
err_t err;
sys_sem_t sem;
LWIP_ERROR("netconn_gethostbyname: invalid name", (name != NULL), return ERR_ARG;);
LWIP_ERROR("netconn_gethostbyname: invalid addr", (addr != NULL), return ERR_ARG;);
sem = sys_sem_new(0);
if (sem == SYS_SEM_NULL) {
return ERR_MEM;
}
msg.name = name;
msg.addr = addr;
msg.err = &err;
msg.sem = sem;
tcpip_callback(do_gethostbyname, &msg);
sys_sem_wait(sem);
sys_sem_free(sem);
return err;
}
#endif /* LWIP_DNS*/
#endif /* LWIP_NETCONN */