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-rw-r--r--grub-core/net/dns.c785
1 files changed, 785 insertions, 0 deletions
diff --git a/grub-core/net/dns.c b/grub-core/net/dns.c
new file mode 100644
index 0000000..906ec7d
--- /dev/null
+++ b/grub-core/net/dns.c
@@ -0,0 +1,785 @@
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2010,2011 Free Software Foundation, Inc.
+ *
+ * GRUB is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GRUB is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/net.h>
+#include <grub/net/udp.h>
+#include <grub/command.h>
+#include <grub/i18n.h>
+#include <grub/err.h>
+#include <grub/time.h>
+#include <grub/safemath.h>
+
+struct dns_cache_element
+{
+ char *name;
+ grub_size_t naddresses;
+ struct grub_net_network_level_address *addresses;
+ grub_uint64_t limit_time;
+};
+
+#define DNS_CACHE_SIZE 1021
+#define DNS_HASH_BASE 423
+
+typedef enum grub_dns_qtype_id
+ {
+ GRUB_DNS_QTYPE_A = 1,
+ GRUB_DNS_QTYPE_AAAA = 28
+ } grub_dns_qtype_id_t;
+
+static struct dns_cache_element dns_cache[DNS_CACHE_SIZE];
+static struct grub_net_network_level_address *dns_servers;
+static grub_size_t dns_nservers, dns_servers_alloc;
+
+grub_err_t
+grub_net_add_dns_server (const struct grub_net_network_level_address *s)
+{
+ if (dns_servers_alloc <= dns_nservers)
+ {
+ int na = dns_servers_alloc * 2;
+ struct grub_net_network_level_address *ns;
+ grub_size_t sz;
+
+ if (na < 8)
+ na = 8;
+
+ if (grub_mul (na, sizeof (ns[0]), &sz))
+ return GRUB_ERR_OUT_OF_RANGE;
+
+ ns = grub_realloc (dns_servers, sz);
+ if (!ns)
+ return grub_errno;
+ dns_servers_alloc = na;
+ dns_servers = ns;
+ }
+ dns_servers[dns_nservers++] = *s;
+ return GRUB_ERR_NONE;
+}
+
+void
+grub_net_remove_dns_server (const struct grub_net_network_level_address *s)
+{
+ grub_size_t i;
+ for (i = 0; i < dns_nservers; i++)
+ if (grub_net_addr_cmp (s, &dns_servers[i]) == 0)
+ break;
+ if (i < dns_nservers)
+ {
+ dns_servers[i] = dns_servers[dns_nservers - 1];
+ dns_nservers--;
+ }
+}
+
+struct dns_header
+{
+ grub_uint16_t id;
+ grub_uint8_t flags;
+ grub_uint8_t ra_z_r_code;
+ grub_uint16_t qdcount;
+ grub_uint16_t ancount;
+ grub_uint16_t nscount;
+ grub_uint16_t arcount;
+} GRUB_PACKED;
+
+enum
+ {
+ FLAGS_RESPONSE = 0x80,
+ FLAGS_OPCODE = 0x78,
+ FLAGS_RD = 0x01
+ };
+
+enum
+ {
+ ERRCODE_MASK = 0x0f
+ };
+
+enum
+ {
+ DNS_PORT = 53
+ };
+
+struct recv_data
+{
+ grub_size_t *naddresses;
+ struct grub_net_network_level_address **addresses;
+ int cache;
+ grub_uint16_t id;
+ int dns_err;
+ char *name;
+ const char *oname;
+ int stop;
+};
+
+static inline int
+hash (const char *str)
+{
+ unsigned v = 0, xn = 1;
+ const char *ptr;
+ for (ptr = str; *ptr; )
+ {
+ v = (v + xn * *ptr);
+ xn = (DNS_HASH_BASE * xn) % DNS_CACHE_SIZE;
+ ptr++;
+ if (((ptr - str) & 0x3ff) == 0)
+ v %= DNS_CACHE_SIZE;
+ }
+ return v % DNS_CACHE_SIZE;
+}
+
+static int
+check_name_real (const grub_uint8_t *name_at, const grub_uint8_t *head,
+ const grub_uint8_t *tail, const char *check_with,
+ int *length, char *set)
+{
+ const char *readable_ptr = check_with;
+ const grub_uint8_t *ptr;
+ char *optr = set;
+ int bytes_processed = 0;
+ if (length)
+ *length = 0;
+ for (ptr = name_at; ptr < tail && bytes_processed < tail - head + 2; )
+ {
+ /* End marker. */
+ if (!*ptr)
+ {
+ if (length && *length)
+ (*length)--;
+ if (optr && optr != set)
+ optr--;
+ if (optr)
+ *optr = 0;
+ return !readable_ptr || (*readable_ptr == 0);
+ }
+ if (*ptr & 0xc0)
+ {
+ bytes_processed += 2;
+ if (ptr + 1 >= tail)
+ return 0;
+ ptr = head + (((ptr[0] & 0x3f) << 8) | ptr[1]);
+ continue;
+ }
+ if (readable_ptr && grub_memcmp (ptr + 1, readable_ptr, *ptr) != 0)
+ return 0;
+ if (grub_memchr (ptr + 1, 0, *ptr)
+ || grub_memchr (ptr + 1, '.', *ptr))
+ return 0;
+ if (readable_ptr)
+ readable_ptr += *ptr;
+ if (readable_ptr && *readable_ptr != '.' && *readable_ptr != 0)
+ return 0;
+ bytes_processed += *ptr + 1;
+ if (length)
+ *length += *ptr + 1;
+ if (optr)
+ {
+ grub_memcpy (optr, ptr + 1, *ptr);
+ optr += *ptr;
+ }
+ if (optr)
+ *optr++ = '.';
+ if (readable_ptr && *readable_ptr)
+ readable_ptr++;
+ ptr += *ptr + 1;
+ }
+ return 0;
+}
+
+static int
+check_name (const grub_uint8_t *name_at, const grub_uint8_t *head,
+ const grub_uint8_t *tail, const char *check_with)
+{
+ return check_name_real (name_at, head, tail, check_with, NULL, NULL);
+}
+
+static char *
+get_name (const grub_uint8_t *name_at, const grub_uint8_t *head,
+ const grub_uint8_t *tail)
+{
+ int length;
+ char *ret;
+
+ if (!check_name_real (name_at, head, tail, NULL, &length, NULL))
+ return NULL;
+ ret = grub_malloc (length + 1);
+ if (!ret)
+ return NULL;
+ if (!check_name_real (name_at, head, tail, NULL, NULL, ret))
+ {
+ grub_free (ret);
+ return NULL;
+ }
+ return ret;
+}
+
+enum
+ {
+ DNS_CLASS_A = 1,
+ DNS_CLASS_CNAME = 5,
+ DNS_CLASS_AAAA = 28
+ };
+
+static grub_err_t
+recv_hook (grub_net_udp_socket_t sock __attribute__ ((unused)),
+ struct grub_net_buff *nb,
+ void *data_)
+{
+ struct dns_header *head;
+ struct recv_data *data = data_;
+ int i, j;
+ grub_uint8_t *ptr, *reparse_ptr;
+ int redirect_cnt = 0;
+ char *redirect_save = NULL;
+ grub_uint32_t ttl_all = ~0U;
+
+ /* Code apparently assumed that only one packet is received as response.
+ We may get multiple responses due to network condition, so check here
+ and quit early. */
+ if (*data->addresses)
+ {
+ grub_netbuff_free (nb);
+ return GRUB_ERR_NONE;
+ }
+
+ head = (struct dns_header *) nb->data;
+ ptr = (grub_uint8_t *) (head + 1);
+ if (ptr >= nb->tail)
+ {
+ grub_netbuff_free (nb);
+ return GRUB_ERR_NONE;
+ }
+
+ if (head->id != data->id)
+ {
+ grub_netbuff_free (nb);
+ return GRUB_ERR_NONE;
+ }
+ if (!(head->flags & FLAGS_RESPONSE) || (head->flags & FLAGS_OPCODE))
+ {
+ grub_netbuff_free (nb);
+ return GRUB_ERR_NONE;
+ }
+ if (head->ra_z_r_code & ERRCODE_MASK)
+ {
+ data->dns_err = 1;
+ grub_netbuff_free (nb);
+ return GRUB_ERR_NONE;
+ }
+ for (i = 0; i < grub_be_to_cpu16 (head->qdcount); i++)
+ {
+ if (ptr >= nb->tail)
+ {
+ grub_netbuff_free (nb);
+ return GRUB_ERR_NONE;
+ }
+ while (ptr < nb->tail && !((*ptr & 0xc0) || *ptr == 0))
+ ptr += *ptr + 1;
+ if (ptr < nb->tail && (*ptr & 0xc0))
+ ptr++;
+ ptr++;
+ ptr += 4;
+ }
+ *data->addresses = grub_calloc (grub_be_to_cpu16 (head->ancount),
+ sizeof ((*data->addresses)[0]));
+ if (!*data->addresses)
+ {
+ grub_errno = GRUB_ERR_NONE;
+ grub_netbuff_free (nb);
+ return GRUB_ERR_NONE;
+ }
+ reparse_ptr = ptr;
+ reparse:
+ for (i = 0, ptr = reparse_ptr; i < grub_be_to_cpu16 (head->ancount); i++)
+ {
+ int ignored = 0;
+ grub_uint8_t class;
+ grub_uint32_t ttl = 0;
+ grub_uint16_t length;
+ if (ptr >= nb->tail)
+ {
+ if (!*data->naddresses)
+ grub_free (*data->addresses);
+ return GRUB_ERR_NONE;
+ }
+ ignored = !check_name (ptr, nb->data, nb->tail, data->name);
+ while (ptr < nb->tail && !((*ptr & 0xc0) || *ptr == 0))
+ ptr += *ptr + 1;
+ if (ptr < nb->tail && (*ptr & 0xc0))
+ ptr++;
+ ptr++;
+ if (ptr + 10 >= nb->tail)
+ {
+ if (!*data->naddresses)
+ grub_free (*data->addresses);
+ grub_netbuff_free (nb);
+ return GRUB_ERR_NONE;
+ }
+ if (*ptr++ != 0)
+ ignored = 1;
+ class = *ptr++;
+ if (*ptr++ != 0)
+ ignored = 1;
+ if (*ptr++ != 1)
+ ignored = 1;
+ for (j = 0; j < 4; j++)
+ {
+ ttl <<= 8;
+ ttl |= *ptr++;
+ }
+ length = *ptr++ << 8;
+ length |= *ptr++;
+ if (ptr + length > nb->tail)
+ {
+ if (!*data->naddresses)
+ grub_free (*data->addresses);
+ grub_netbuff_free (nb);
+ return GRUB_ERR_NONE;
+ }
+ if (!ignored)
+ {
+ if (ttl_all > ttl)
+ ttl_all = ttl;
+ switch (class)
+ {
+ case DNS_CLASS_A:
+ if (length != 4)
+ break;
+ (*data->addresses)[*data->naddresses].type
+ = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4;
+ grub_memcpy (&(*data->addresses)[*data->naddresses].ipv4,
+ ptr, 4);
+ (*data->naddresses)++;
+ data->stop = 1;
+ break;
+ case DNS_CLASS_AAAA:
+ if (length != 16)
+ break;
+ (*data->addresses)[*data->naddresses].type
+ = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV6;
+ grub_memcpy (&(*data->addresses)[*data->naddresses].ipv6,
+ ptr, 16);
+ (*data->naddresses)++;
+ data->stop = 1;
+ break;
+ case DNS_CLASS_CNAME:
+ if (!(redirect_cnt & (redirect_cnt - 1)))
+ {
+ grub_free (redirect_save);
+ redirect_save = data->name;
+ }
+ else
+ grub_free (data->name);
+ redirect_cnt++;
+ data->name = get_name (ptr, nb->data, nb->tail);
+ if (!data->name)
+ {
+ data->dns_err = 1;
+ grub_errno = 0;
+ return GRUB_ERR_NONE;
+ }
+ grub_dprintf ("dns", "CNAME %s\n", data->name);
+ if (grub_strcmp (redirect_save, data->name) == 0)
+ {
+ data->dns_err = 1;
+ grub_free (redirect_save);
+ return GRUB_ERR_NONE;
+ }
+ goto reparse;
+ }
+ }
+ ptr += length;
+ }
+ if (ttl_all && *data->naddresses && data->cache)
+ {
+ int h;
+ grub_dprintf ("dns", "caching for %d seconds\n", ttl_all);
+ h = hash (data->oname);
+ grub_free (dns_cache[h].name);
+ dns_cache[h].name = 0;
+ grub_free (dns_cache[h].addresses);
+ dns_cache[h].addresses = 0;
+ dns_cache[h].name = grub_strdup (data->oname);
+ dns_cache[h].naddresses = *data->naddresses;
+ dns_cache[h].addresses = grub_calloc (*data->naddresses,
+ sizeof (dns_cache[h].addresses[0]));
+ dns_cache[h].limit_time = grub_get_time_ms () + 1000 * ttl_all;
+ if (!dns_cache[h].addresses || !dns_cache[h].name)
+ {
+ grub_free (dns_cache[h].name);
+ dns_cache[h].name = 0;
+ grub_free (dns_cache[h].addresses);
+ dns_cache[h].addresses = 0;
+ }
+ grub_memcpy (dns_cache[h].addresses, *data->addresses,
+ *data->naddresses
+ * sizeof (dns_cache[h].addresses[0]));
+ }
+ grub_netbuff_free (nb);
+ grub_free (redirect_save);
+ return GRUB_ERR_NONE;
+}
+
+grub_err_t
+grub_net_dns_lookup (const char *name,
+ const struct grub_net_network_level_address *servers,
+ grub_size_t n_servers,
+ grub_size_t *naddresses,
+ struct grub_net_network_level_address **addresses,
+ int cache)
+{
+ grub_size_t send_servers = 0;
+ grub_size_t i, j;
+ struct grub_net_buff *nb;
+ grub_net_udp_socket_t *sockets;
+ grub_uint8_t *optr;
+ const char *iptr;
+ struct dns_header *head;
+ static grub_uint16_t id = 1;
+ grub_uint8_t *qtypeptr;
+ grub_err_t err = GRUB_ERR_NONE;
+ struct recv_data data = {naddresses, addresses, cache,
+ grub_cpu_to_be16 (id++), 0, 0, name, 0};
+ grub_uint8_t *nbd;
+ grub_size_t try_server = 0;
+
+ if (!servers)
+ {
+ servers = dns_servers;
+ n_servers = dns_nservers;
+ }
+
+ if (!n_servers)
+ return grub_error (GRUB_ERR_BAD_ARGUMENT,
+ N_("no DNS servers configured"));
+
+ *naddresses = 0;
+ if (cache)
+ {
+ int h;
+ h = hash (name);
+ if (dns_cache[h].name && grub_strcmp (dns_cache[h].name, name) == 0
+ && grub_get_time_ms () < dns_cache[h].limit_time)
+ {
+ grub_dprintf ("dns", "retrieved from cache\n");
+ *addresses = grub_malloc (dns_cache[h].naddresses
+ * sizeof ((*addresses)[0]));
+ if (!*addresses)
+ return grub_errno;
+ *naddresses = dns_cache[h].naddresses;
+ grub_memcpy (*addresses, dns_cache[h].addresses,
+ dns_cache[h].naddresses
+ * sizeof ((*addresses)[0]));
+ return GRUB_ERR_NONE;
+ }
+ }
+
+ sockets = grub_calloc (n_servers, sizeof (sockets[0]));
+ if (!sockets)
+ return grub_errno;
+
+ data.name = grub_strdup (name);
+ if (!data.name)
+ {
+ grub_free (sockets);
+ return grub_errno;
+ }
+
+ nb = grub_netbuff_alloc (GRUB_NET_OUR_MAX_IP_HEADER_SIZE
+ + GRUB_NET_MAX_LINK_HEADER_SIZE
+ + GRUB_NET_UDP_HEADER_SIZE
+ + sizeof (struct dns_header)
+ + grub_strlen (name) + 2 + 4);
+ if (!nb)
+ {
+ grub_free (sockets);
+ grub_free (data.name);
+ return grub_errno;
+ }
+ grub_netbuff_reserve (nb, GRUB_NET_OUR_MAX_IP_HEADER_SIZE
+ + GRUB_NET_MAX_LINK_HEADER_SIZE
+ + GRUB_NET_UDP_HEADER_SIZE);
+ grub_netbuff_put (nb, sizeof (struct dns_header)
+ + grub_strlen (name) + 2 + 4);
+ head = (struct dns_header *) nb->data;
+ optr = (grub_uint8_t *) (head + 1);
+ for (iptr = name; *iptr; )
+ {
+ const char *dot;
+ dot = grub_strchr (iptr, '.');
+ if (!dot)
+ dot = iptr + grub_strlen (iptr);
+ if ((dot - iptr) >= 64)
+ {
+ grub_free (sockets);
+ grub_free (data.name);
+ return grub_error (GRUB_ERR_BAD_ARGUMENT,
+ N_("domain name component is too long"));
+ }
+ *optr = (dot - iptr);
+ optr++;
+ grub_memcpy (optr, iptr, dot - iptr);
+ optr += dot - iptr;
+ iptr = dot;
+ if (*iptr)
+ iptr++;
+ }
+ *optr++ = 0;
+
+ /* Type. */
+ *optr++ = 0;
+ qtypeptr = optr++;
+
+ /* Class. */
+ *optr++ = 0;
+ *optr++ = 1;
+
+ head->id = data.id;
+ head->flags = FLAGS_RD;
+ head->ra_z_r_code = 0;
+ head->qdcount = grub_cpu_to_be16_compile_time (1);
+ head->ancount = grub_cpu_to_be16_compile_time (0);
+ head->nscount = grub_cpu_to_be16_compile_time (0);
+ head->arcount = grub_cpu_to_be16_compile_time (0);
+
+ nbd = nb->data;
+
+ for (i = 0; i < n_servers * 4; i++)
+ {
+ /* Connect to a next server. */
+ while (!(i & 1) && try_server < n_servers)
+ {
+ sockets[send_servers] = grub_net_udp_open (servers[try_server++],
+ DNS_PORT,
+ recv_hook,
+ &data);
+ if (!sockets[send_servers])
+ {
+ err = grub_errno;
+ grub_errno = GRUB_ERR_NONE;
+ }
+ else
+ {
+ send_servers++;
+ break;
+ }
+ }
+ if (!send_servers)
+ goto out;
+ if (*data.naddresses)
+ goto out;
+ for (j = 0; j < send_servers; j++)
+ {
+ grub_err_t err2;
+
+ grub_size_t t = 0;
+ do
+ {
+ nb->data = nbd;
+ if (servers[j].option == DNS_OPTION_IPV4 ||
+ ((servers[j].option == DNS_OPTION_PREFER_IPV4) && (t++ == 0)) ||
+ ((servers[j].option == DNS_OPTION_PREFER_IPV6) && (t++ == 1)))
+ *qtypeptr = GRUB_DNS_QTYPE_A;
+ else
+ *qtypeptr = GRUB_DNS_QTYPE_AAAA;
+
+ grub_dprintf ("dns", "QTYPE: %u QNAME: %s\n", *qtypeptr, name);
+
+ err2 = grub_net_send_udp_packet (sockets[j], nb);
+ if (err2)
+ {
+ grub_errno = GRUB_ERR_NONE;
+ err = err2;
+ }
+ if (*data.naddresses)
+ goto out;
+ }
+ while (t == 1);
+ }
+ grub_net_poll_cards (200, &data.stop);
+ }
+ out:
+ grub_free (data.name);
+ grub_netbuff_free (nb);
+ for (j = 0; j < send_servers; j++)
+ grub_net_udp_close (sockets[j]);
+
+ grub_free (sockets);
+
+ if (*data.naddresses)
+ return GRUB_ERR_NONE;
+ if (data.dns_err)
+ return grub_error (GRUB_ERR_NET_NO_DOMAIN,
+ N_("no DNS record found"));
+
+ if (err)
+ {
+ grub_errno = err;
+ return err;
+ }
+ return grub_error (GRUB_ERR_TIMEOUT,
+ N_("no DNS reply received"));
+}
+
+static grub_err_t
+grub_cmd_nslookup (struct grub_command *cmd __attribute__ ((unused)),
+ int argc, char **args)
+{
+ grub_err_t err;
+ struct grub_net_network_level_address cmd_server;
+ struct grub_net_network_level_address *servers;
+ grub_size_t nservers, i, naddresses = 0;
+ struct grub_net_network_level_address *addresses = 0;
+ if (argc != 2 && argc != 1)
+ return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("two arguments expected"));
+ if (argc == 2)
+ {
+ err = grub_net_resolve_address (args[1], &cmd_server);
+ if (err)
+ return err;
+ servers = &cmd_server;
+ nservers = 1;
+ }
+ else
+ {
+ servers = dns_servers;
+ nservers = dns_nservers;
+ }
+
+ grub_net_dns_lookup (args[0], servers, nservers, &naddresses,
+ &addresses, 0);
+
+ for (i = 0; i < naddresses; i++)
+ {
+ char buf[GRUB_NET_MAX_STR_ADDR_LEN];
+ grub_net_addr_to_str (&addresses[i], buf);
+ grub_printf ("%s\n", buf);
+ }
+ grub_free (addresses);
+ if (naddresses)
+ return GRUB_ERR_NONE;
+ return grub_error (GRUB_ERR_NET_NO_DOMAIN, N_("no DNS record found"));
+}
+
+static grub_err_t
+grub_cmd_list_dns (struct grub_command *cmd __attribute__ ((unused)),
+ int argc __attribute__ ((unused)),
+ char **args __attribute__ ((unused)))
+{
+ grub_size_t i;
+ const char *strtype = "";
+
+ for (i = 0; i < dns_nservers; i++)
+ {
+ switch (dns_servers[i].option)
+ {
+ case DNS_OPTION_IPV4:
+ strtype = _("only ipv4");
+ break;
+
+ case DNS_OPTION_IPV6:
+ strtype = _("only ipv6");
+ break;
+
+ case DNS_OPTION_PREFER_IPV4:
+ strtype = _("prefer ipv4");
+ break;
+
+ case DNS_OPTION_PREFER_IPV6:
+ strtype = _("prefer ipv6");
+ break;
+ }
+
+ char buf[GRUB_NET_MAX_STR_ADDR_LEN];
+ grub_net_addr_to_str (&dns_servers[i], buf);
+ grub_printf ("%s (%s)\n", buf, strtype);
+ }
+ return GRUB_ERR_NONE;
+}
+
+static grub_err_t
+grub_cmd_add_dns (struct grub_command *cmd __attribute__ ((unused)),
+ int argc, char **args)
+{
+ grub_err_t err;
+ struct grub_net_network_level_address server;
+
+ if ((argc < 1) || (argc > 2))
+ return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("one argument expected"));
+ else if (argc == 1)
+ server.option = DNS_OPTION_PREFER_IPV4;
+ else
+ {
+ if (grub_strcmp (args[1], "--only-ipv4") == 0)
+ server.option = DNS_OPTION_IPV4;
+ else if (grub_strcmp (args[1], "--only-ipv6") == 0)
+ server.option = DNS_OPTION_IPV6;
+ else if (grub_strcmp (args[1], "--prefer-ipv4") == 0)
+ server.option = DNS_OPTION_PREFER_IPV4;
+ else if (grub_strcmp (args[1], "--prefer-ipv6") == 0)
+ server.option = DNS_OPTION_PREFER_IPV6;
+ else
+ return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("invalid argument"));
+ }
+
+ err = grub_net_resolve_address (args[0], &server);
+ if (err)
+ return err;
+
+ return grub_net_add_dns_server (&server);
+}
+
+static grub_err_t
+grub_cmd_del_dns (struct grub_command *cmd __attribute__ ((unused)),
+ int argc, char **args)
+{
+ grub_err_t err;
+ struct grub_net_network_level_address server;
+
+ if (argc != 1)
+ return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("one argument expected"));
+ err = grub_net_resolve_address (args[1], &server);
+ if (err)
+ return err;
+
+ return grub_net_add_dns_server (&server);
+}
+
+static grub_command_t cmd, cmd_add, cmd_del, cmd_list;
+
+void
+grub_dns_init (void)
+{
+ cmd = grub_register_command ("net_nslookup", grub_cmd_nslookup,
+ N_("ADDRESS DNSSERVER"),
+ N_("Perform a DNS lookup"));
+ cmd_add = grub_register_command ("net_add_dns", grub_cmd_add_dns,
+ N_("DNSSERVER"),
+ N_("Add a DNS server"));
+ cmd_del = grub_register_command ("net_del_dns", grub_cmd_del_dns,
+ N_("DNSSERVER"),
+ N_("Remove a DNS server"));
+ cmd_list = grub_register_command ("net_ls_dns", grub_cmd_list_dns,
+ NULL, N_("List DNS servers"));
+}
+
+void
+grub_dns_fini (void)
+{
+ grub_unregister_command (cmd);
+ grub_unregister_command (cmd_add);
+ grub_unregister_command (cmd_del);
+ grub_unregister_command (cmd_list);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-04 22:32:14 +0000