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Add CMD_DNS when NET_LWIP is enabled to provide the dns command using lwIP. Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org> Acked-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
128 lines
2.3 KiB
C
128 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/* Copyright (C) 2024 Linaro Ltd. */
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#include <command.h>
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#include <console.h>
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#include <lwip/dns.h>
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#include <lwip/timeouts.h>
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#include <net.h>
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#include <time.h>
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#define DNS_RESEND_MS 1000
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#define DNS_TIMEOUT_MS 10000
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struct dns_cb_arg {
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ip_addr_t host_ipaddr;
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const char *var;
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bool done;
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};
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static void do_dns_tmr(void *arg)
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{
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dns_tmr();
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}
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static void dns_cb(const char *name, const ip_addr_t *ipaddr, void *arg)
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{
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struct dns_cb_arg *dns_cb_arg = arg;
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char *ipstr = ip4addr_ntoa(ipaddr);
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dns_cb_arg->done = true;
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if (!ipaddr) {
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printf("DNS: host not found\n");
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dns_cb_arg->host_ipaddr.addr = 0;
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return;
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}
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if (dns_cb_arg->var)
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env_set(dns_cb_arg->var, ipstr);
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printf("%s\n", ipstr);
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}
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static int dns_loop(struct udevice *udev, const char *name, const char *var)
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{
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struct dns_cb_arg dns_cb_arg = { };
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bool has_server = false;
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struct netif *netif;
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ip_addr_t ipaddr;
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ip_addr_t ns;
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ulong start;
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char *nsenv;
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int ret;
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dns_cb_arg.var = var;
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netif = net_lwip_new_netif(udev);
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if (!netif)
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return -1;
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dns_init();
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nsenv = env_get("dnsip");
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if (nsenv && ipaddr_aton(nsenv, &ns)) {
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dns_setserver(0, &ns);
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has_server = true;
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}
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nsenv = env_get("dnsip2");
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if (nsenv && ipaddr_aton(nsenv, &ns)) {
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dns_setserver(1, &ns);
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has_server = true;
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}
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if (!has_server) {
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log_err("No valid name server (dnsip/dnsip2)\n");
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net_lwip_remove_netif(netif);
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return CMD_RET_FAILURE;
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}
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dns_cb_arg.done = false;
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ret = dns_gethostbyname(name, &ipaddr, dns_cb, &dns_cb_arg);
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if (ret == ERR_OK) {
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dns_cb(name, &ipaddr, &dns_cb_arg);
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} else if (ret == ERR_INPROGRESS) {
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start = get_timer(0);
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sys_timeout(DNS_RESEND_MS, do_dns_tmr, NULL);
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do {
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net_lwip_rx(udev, netif);
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if (dns_cb_arg.done)
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break;
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sys_check_timeouts();
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if (ctrlc()) {
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printf("\nAbort\n");
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break;
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}
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} while (get_timer(start) < DNS_TIMEOUT_MS);
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sys_untimeout(do_dns_tmr, NULL);
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}
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net_lwip_remove_netif(netif);
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if (dns_cb_arg.done && dns_cb_arg.host_ipaddr.addr != 0)
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return CMD_RET_SUCCESS;
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return CMD_RET_FAILURE;
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}
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int do_dns(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
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{
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char *name;
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char *var = NULL;
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if (argc == 1 || argc > 3)
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return CMD_RET_USAGE;
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name = argv[1];
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if (argc == 3)
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var = argv[2];
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eth_set_current();
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return dns_loop(eth_get_dev(), name, var);
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}
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