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// SPDX-License-Identifier: GPL-2.0+
/* Copyright (C) 2024 Linaro Ltd. */
#include <command.h>
#include <console.h>
#include <env.h>
#include <lwip/dns.h>
#include <lwip/timeouts.h>
#include <net.h>
#include <time.h>
U_BOOT_CMD(dns, 3, 1, do_dns, "lookup the IP of a hostname",
"hostname [envvar]");
#define DNS_RESEND_MS 1000
#define DNS_TIMEOUT_MS 10000
struct dns_cb_arg {
ip_addr_t host_ipaddr;
const char *var;
bool done;
};
static void do_dns_tmr(void *arg)
{
dns_tmr();
}
static void dns_cb(const char *name, const ip_addr_t *ipaddr, void *arg)
{
struct dns_cb_arg *dns_cb_arg = arg;
char *ipstr = ip4addr_ntoa(ipaddr);
dns_cb_arg->done = true;
if (!ipaddr) {
printf("DNS: host not found\n");
dns_cb_arg->host_ipaddr.addr = 0;
return;
}
dns_cb_arg->host_ipaddr.addr = ipaddr->addr;
if (dns_cb_arg->var)
env_set(dns_cb_arg->var, ipstr);
}
static int dns_loop(struct udevice *udev, const char *name, const char *var)
{
struct dns_cb_arg dns_cb_arg = { };
struct netif *netif;
ip_addr_t ipaddr;
ulong start;
int ret;
dns_cb_arg.var = var;
netif = net_lwip_new_netif(udev);
if (!netif)
return CMD_RET_FAILURE;
if (net_lwip_dns_init()) {
net_lwip_remove_netif(netif);
return CMD_RET_FAILURE;
}
dns_cb_arg.done = false;
ret = dns_gethostbyname(name, &ipaddr, dns_cb, &dns_cb_arg);
if (ret == ERR_OK) {
dns_cb(name, &ipaddr, &dns_cb_arg);
} else if (ret == ERR_INPROGRESS) {
start = get_timer(0);
sys_timeout(DNS_RESEND_MS, do_dns_tmr, NULL);
do {
net_lwip_rx(udev, netif);
if (dns_cb_arg.done)
break;
if (ctrlc()) {
printf("\nAbort\n");
break;
}
} while (get_timer(start) < DNS_TIMEOUT_MS);
sys_untimeout(do_dns_tmr, NULL);
}
net_lwip_remove_netif(netif);
if (dns_cb_arg.done && dns_cb_arg.host_ipaddr.addr != 0) {
if (!var)
printf("%s\n", ipaddr_ntoa(&ipaddr));
return CMD_RET_SUCCESS;
}
return CMD_RET_FAILURE;
}
int do_dns(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
{
char *name;
char *var = NULL;
if (argc == 1 || argc > 3)
return CMD_RET_USAGE;
name = argv[1];
if (argc == 3)
var = argv[2];
if (net_lwip_eth_start() < 0)
return CMD_RET_FAILURE;
return dns_loop(eth_get_dev(), name, var);
}
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