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lwip: add net_lwip_dns_resolve()

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Add a helper fonction to convert an IP address (supplied as a text
string) or a host name to an ip_addr_t.

Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
This commit is contained in:
Jerome Forissier
2025-06-25 15:19:16 +02:00
parent 1361d9f4f0
commit 9501274f94
2 changed files with 40 additions and 0 deletions
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39
net/lwip/net-lwip.c
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@@ -7,6 +7,7 @@
#include <dm/device.h>
#include <dm/uclass.h>
#include <hexdump.h>
#include <linux/kernel.h>
#include <lwip/ip4_addr.h>
#include <lwip/dns.h>
#include <lwip/err.h>
@@ -358,6 +359,44 @@ int net_lwip_rx(struct udevice *udev, struct netif *netif)
return len;
}
/**
* net_lwip_dns_resolve() - find IP address from name or IP
*
* @name_or_ip: host name or IP address
* @ip: output IP address
*
* Return value: 0 on success, -1 on failure.
*/
int net_lwip_dns_resolve(char *name_or_ip, ip_addr_t *ip)
{
#if defined(CONFIG_CMD_DNS)
char *var = "_dnsres";
char *argv[] = { "dns", name_or_ip, var, NULL };
int argc = ARRAY_SIZE(argv) - 1;
#endif
if (ipaddr_aton(name_or_ip, ip))
return 0;
#if defined(CONFIG_CMD_DNS)
if (do_dns(NULL, 0, argc, argv) != CMD_RET_SUCCESS)
return -1;
name_or_ip = env_get(var);
if (!name_or_ip)
return -1;
if (!ipaddr_aton(name_or_ip, ip))
return -1;
env_set(var, NULL);
return 0;
#else
return -1;
#endif
}
void net_process_received_packet(uchar *in_packet, int len)
{
#if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)