source3/winbindd/winbindd_wins_byname.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    async implementation of WINBINDD_WINS_BYNAME
   4    Copyright (C) Volker Lendecke 2011
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "winbindd.h"
  22 #include "libsmb/namequery.h"
  23 #include "librpc/gen_ndr/ndr_winbind_c.h"
  24 #include "libsmb/nmblib.h"
  25 #include "lib/util/string_wrappers.h"
  26
  27 struct winbindd_wins_byname_state {
  28         struct tevent_context *ev;
  29         struct winbindd_request *request;
  30         struct sockaddr_storage *addrs;
  31         size_t num_addrs;
  32 };
  33
  34 static void winbindd_wins_byname_wins_done(struct tevent_req *subreq);
  35 static void winbindd_wins_byname_bcast_done(struct tevent_req *subreq);
  36
  37 struct tevent_req *winbindd_wins_byname_send(TALLOC_CTX *mem_ctx,
  38                                              struct tevent_context *ev,
  39                                              struct winbindd_cli_state *cli,
  40                                              struct winbindd_request *request)
  41 {
  42         struct tevent_req *req, *subreq;
  43         struct winbindd_wins_byname_state *state;
  44
  45         req = tevent_req_create(mem_ctx, &state,
  46                                 struct winbindd_wins_byname_state);
  47         if (req == NULL) {
  48                 return NULL;
  49         }
  50         state->ev = ev;
  51         state->request = request;
  52
  53         /* Ensure null termination */
  54         request->data.winsreq[sizeof(request->data.winsreq)-1]='\0';
  55
  56         D_NOTICE("[%s (%u)] Winbind external command WINS_BYNAME start.\n"
  57                  "Resolving wins byname for '%s'.\n",
  58                  cli->client_name,
  59                  (unsigned int)cli->pid,
  60                  request->data.winsreq);
  61
  62         subreq = resolve_wins_send(state, ev, state->request->data.winsreq,
  63                                    0x20);
  64         if (tevent_req_nomem(subreq, req)) {
  65                 return tevent_req_post(req, ev);
  66         }
  67         tevent_req_set_callback(subreq, winbindd_wins_byname_wins_done, req);
  68         return req;
  69 }
  70
  71 static void winbindd_wins_byname_wins_done(struct tevent_req *subreq)
  72 {
  73         struct tevent_req *req = tevent_req_callback_data(
  74                 subreq, struct tevent_req);
  75         struct winbindd_wins_byname_state *state = tevent_req_data(
  76                 req, struct winbindd_wins_byname_state);
  77         NTSTATUS status;
  78
  79         status = resolve_wins_recv(subreq, talloc_tos(), &state->addrs,
  80                                    &state->num_addrs, NULL);
  81         TALLOC_FREE(subreq);
  82         if (NT_STATUS_IS_OK(status)) {
  83                 tevent_req_done(req);
  84                 return;
  85         }
  86         subreq = name_resolve_bcast_send(state, state->ev,
  87                                          state->request->data.winsreq, 0x20);
  88         if (tevent_req_nomem(subreq, req)) {
  89                 return;
  90         }
  91         tevent_req_set_callback(subreq, winbindd_wins_byname_bcast_done, req);
  92 }
  93
  94 static void winbindd_wins_byname_bcast_done(struct tevent_req *subreq)
  95 {
  96         struct tevent_req *req = tevent_req_callback_data(
  97                 subreq, struct tevent_req);
  98         struct winbindd_wins_byname_state *state = tevent_req_data(
  99                 req, struct winbindd_wins_byname_state);
 100         NTSTATUS status;
 101
 102         status = name_resolve_bcast_recv(subreq, talloc_tos(), &state->addrs,
 103                                          &state->num_addrs);
 104         TALLOC_FREE(subreq);
 105         if (tevent_req_nterror(req, status)) {
 106                 return;
 107         }
 108         tevent_req_done(req);
 109 }
 110
 111 NTSTATUS winbindd_wins_byname_recv(struct tevent_req *req,
 112                                    struct winbindd_response *presp)
 113 {
 114         struct winbindd_wins_byname_state *state = tevent_req_data(
 115                 req, struct winbindd_wins_byname_state);
 116         char *response;
 117         NTSTATUS status;
 118         size_t i;
 119
 120         if (tevent_req_is_nterror(req, &status)) {
 121                 return status;
 122         }
 123
 124         response = talloc_strdup(talloc_tos(), "");
 125         if (response == NULL) {
 126                 return NT_STATUS_NO_MEMORY;
 127         }
 128
 129         D_NOTICE("Winbind external command WINS_BYNAME end.\n"
 130                  "Received %zu address(es).\n",
 131                  state->num_addrs);
 132         for (i=0; i<state->num_addrs; i++) {
 133                 char addr[INET6_ADDRSTRLEN];
 134                 print_sockaddr(addr, sizeof(addr), &state->addrs[i]);
 135                 D_NOTICE("%zu: %s\n", i, addr);
 136                 talloc_asprintf_addbuf(
 137                         &response, "%s%s", addr,
 138                         i < (state->num_addrs-1) ? " " : "");
 139         }
 140
 141         talloc_asprintf_addbuf(
 142                 &response, "\t%s\n", state->request->data.winsreq);
 143         if (response == NULL) {
 144                 return NT_STATUS_NO_MEMORY;
 145         }
 146
 147         if (talloc_get_size(response) > sizeof(presp->data.winsresp)) {
 148                 TALLOC_FREE(response);
 149                 return NT_STATUS_MARSHALL_OVERFLOW;
 150         }
 151         fstrcpy(presp->data.winsresp, response);
 152         TALLOC_FREE(response);
 153         return NT_STATUS_OK;
 154 }