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/*
Unix SMB/CIFS implementation.
broadcast name resolution module
Copyright (C) Andrew Tridgell 1994-1998,2005
Copyright (C) Jeremy Allison 2007
Copyright (C) Jelmer Vernooij 2007
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2009-2010
This program 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.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "libcli/composite/composite.h"
#include "libcli/resolve/resolve.h"
#include "lib/socket/socket.h"
#include "system/network.h"
#include "lib/socket/netif.h"
#include "param/param.h"
#include "lib/util/util_net.h"
#include "libcli/nbt/libnbt.h"
struct resolve_file_data {
const char *lookup_file;
const char *default_domain;
};
struct resolve_file_state {
struct socket_address **addrs;
char **names;
};
/**
broadcast name resolution method - async send
*/
/*
general name resolution - async send
*/
struct composite_context *resolve_name_file_send(TALLOC_CTX *mem_ctx,
struct tevent_context *event_ctx,
void *userdata, uint32_t flags,
uint16_t port,
struct nbt_name *name)
{
struct composite_context *c;
struct resolve_file_data *data = talloc_get_type_abort(userdata, struct resolve_file_data);
struct resolve_file_state *state;
struct sockaddr_storage *resolved_iplist;
int resolved_count, i;
char *dns_name;
bool srv_lookup = (flags & RESOLVE_NAME_FLAG_DNS_SRV);
if (event_ctx == NULL) {
return NULL;
}
c = composite_create(mem_ctx, event_ctx);
if (c == NULL) return NULL;
/* This isn't an NBT layer resolver */
if (flags & RESOLVE_NAME_FLAG_FORCE_NBT || name->type != NBT_NAME_SERVER) {
composite_error(c, NT_STATUS_OBJECT_NAME_NOT_FOUND);
return c;
}
if (composite_nomem(c->event_ctx, c)) return c;
state = talloc_zero(c, struct resolve_file_state);
if (composite_nomem(state, c)) return c;
c->private_data = state;
dns_name = name->name;
if (strchr(dns_name, '.') == NULL) {
dns_name = talloc_asprintf(state, "%s.%s", dns_name, data->default_domain);
}
c->status = resolve_dns_hosts_file_as_sockaddr(data->lookup_file, dns_name,
srv_lookup, state, &resolved_iplist, &resolved_count);
if (!composite_is_ok(c)) return c;
for (i=0; i < resolved_count; i++) {
state->addrs = talloc_realloc(state, state->addrs, struct socket_address *, i+2);
if (composite_nomem(state->addrs, c)) return c;
if (!(flags & RESOLVE_NAME_FLAG_OVERWRITE_PORT)) {
set_sockaddr_port((struct sockaddr *)&resolved_iplist[i], port);
}
state->addrs[i] = socket_address_from_sockaddr(state->addrs, (struct sockaddr *)&resolved_iplist[i], sizeof(resolved_iplist[i]));
if (composite_nomem(state->addrs[i], c)) return c;
state->addrs[i+1] = NULL;
state->names = talloc_realloc(state, state->names, char *, i+2);
if (composite_nomem(state->addrs, c)) return c;
state->names[i] = talloc_strdup(state->names, dns_name);
if (composite_nomem(state->names[i], c)) return c;
state->names[i+1] = NULL;
i++;
}
composite_done(c);
return c;
}
/*
general name resolution method - recv side
*/
NTSTATUS resolve_name_file_recv(struct composite_context *c,
TALLOC_CTX *mem_ctx,
struct socket_address ***addrs,
char ***names)
{
NTSTATUS status;
status = composite_wait(c);
if (NT_STATUS_IS_OK(status)) {
struct resolve_file_state *state = talloc_get_type(c->private_data, struct resolve_file_state);
*addrs = talloc_steal(mem_ctx, state->addrs);
if (names) {
*names = talloc_steal(mem_ctx, state->names);
}
}
talloc_free(c);
return status;
}
bool resolve_context_add_file_method(struct resolve_context *ctx, const char *lookup_file, const char *default_domain)
{
struct resolve_file_data *data = talloc(ctx, struct resolve_file_data);
data->lookup_file = talloc_strdup(data, lookup_file);
data->default_domain = talloc_strdup(data, default_domain);
return resolve_context_add_method(ctx, resolve_name_file_send, resolve_name_file_recv, data);
}
bool resolve_context_add_file_method_lp(struct resolve_context *ctx, struct loadparm_context *lp_ctx)
{
return resolve_context_add_file_method(ctx,
lpcfg_parm_string(lp_ctx, NULL, "resolv", "host file"),
lpcfg_dnsdomain(lp_ctx));
}
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