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optimization DNS get function

This commit is contained in:
xueyunfei 2020-06-04 16:03:27 +08:00
parent c13b946773
commit 32b3c255ac
1 changed files with 11 additions and 9 deletions
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20
components/tcp_transport/transport_tcp.c
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@ -34,18 +34,20 @@ typedef struct {
static int resolve_dns(const char *host, struct sockaddr_in *ip) {
struct hostent *he;
struct in_addr **addr_list;
he = gethostbyname(host);
if (he == NULL) {
return ESP_FAIL;
}
addr_list = (struct in_addr **)he->h_addr_list;
if (addr_list[0] == NULL) {
const struct addrinfo hints = {
.ai_family = AF_INET,
.ai_socktype = SOCK_STREAM,
};
struct addrinfo *res;
int err = getaddrinfo(host, NULL, &hints, &res);
if(err != 0 || res == NULL) {
ESP_LOGE(TAG, "DNS lookup failed err=%d res=%p", err, res);
return ESP_FAIL;
}
ip->sin_family = AF_INET;
memcpy(&ip->sin_addr, addr_list[0], sizeof(ip->sin_addr));
memcpy(&ip->sin_addr, &((struct sockaddr_in *)(res->ai_addr))->sin_addr, sizeof(ip->sin_addr));
freeaddrinfo(res);
return ESP_OK;
}