source3/winbindd/winbindd_wins_byip.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    async implementation of WINBINDD_WINS_BYIP
   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 "librpc/gen_ndr/ndr_winbind_c.h"
  23 #include "libsmb/nmblib.h"
  24
  25 struct winbindd_wins_byip_state {
  26         struct nmb_name star;
  27         struct sockaddr_storage addr;
  28         fstring response;
  29 };
  30
  31 static void winbindd_wins_byip_done(struct tevent_req *subreq);
  32
  33 struct tevent_req *winbindd_wins_byip_send(TALLOC_CTX *mem_ctx,
  34                                            struct tevent_context *ev,
  35                                            struct winbindd_cli_state *cli,
  36                                            struct winbindd_request *request)
  37 {
  38         struct tevent_req *req, *subreq;
  39         struct winbindd_wins_byip_state *state;
  40
  41         req = tevent_req_create(mem_ctx, &state,
  42                                 struct winbindd_wins_byip_state);
  43         if (req == NULL) {
  44                 return NULL;
  45         }
  46
  47         /* Ensure null termination */
  48         request->data.winsreq[sizeof(request->data.winsreq)-1]='\0';
  49
  50         fstr_sprintf(state->response, "%s\t", request->data.winsreq);
  51
  52         DEBUG(3, ("[%5lu]: wins_byip %s\n", (unsigned long)cli->pid,
  53                   request->data.winsreq));
  54
  55         make_nmb_name(&state->star, "*", 0);
  56
  57         if (!interpret_string_addr(&state->addr, request->data.winsreq,
  58                                    AI_NUMERICHOST)) {
  59                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
  60                 return tevent_req_post(req, ev);
  61         }
  62
  63         subreq = node_status_query_send(state, ev, &state->star,
  64                                         &state->addr);
  65         if (tevent_req_nomem(subreq, req)) {
  66                 return tevent_req_post(req, ev);
  67         }
  68         tevent_req_set_callback(subreq, winbindd_wins_byip_done, req);
  69         return req;
  70 }
  71
  72 static void winbindd_wins_byip_done(struct tevent_req *subreq)
  73 {
  74         struct tevent_req *req = tevent_req_callback_data(
  75                 subreq, struct tevent_req);
  76         struct winbindd_wins_byip_state *state = tevent_req_data(
  77                 req, struct winbindd_wins_byip_state);
  78         struct node_status *names;
  79         int i, num_names;
  80         NTSTATUS status;
  81
  82         status = node_status_query_recv(subreq, talloc_tos(), &names,
  83                                         &num_names, NULL);
  84         TALLOC_FREE(subreq);
  85         if (tevent_req_nterror(req, status)) {
  86                 return;
  87         }
  88
  89         for (i=0; i<num_names; i++) {
  90                 size_t size;
  91                 /*
  92                  * ignore group names
  93                  */
  94                 if (names[i].flags & 0x80) {
  95                         continue;
  96                 }
  97                 /*
  98                  * Only report 0x20
  99                  */
 100                 if (names[i].type != 0x20) {
 101                         continue;
 102                 }
 103
 104                 DEBUG(10, ("got name %s\n", names[i].name));
 105
 106                 size = strlen(names[i].name + strlen(state->response));
 107                 if (size > sizeof(state->response) - 1) {
 108                         DEBUG(10, ("To much data\n"));
 109                         tevent_req_nterror(req, STATUS_BUFFER_OVERFLOW);
 110                         return;
 111                 }
 112                 fstrcat(state->response, names[i].name);
 113                 fstrcat(state->response, " ");
 114         }
 115         state->response[strlen(state->response)-1] = '\n';
 116
 117         DEBUG(10, ("response: %s", state->response));
 118
 119         TALLOC_FREE(names);
 120         tevent_req_done(req);
 121 }
 122
 123 NTSTATUS winbindd_wins_byip_recv(struct tevent_req *req,
 124                                  struct winbindd_response *presp)
 125 {
 126         struct winbindd_wins_byip_state *state = tevent_req_data(
 127                 req, struct winbindd_wins_byip_state);
 128         NTSTATUS status;
 129
 130         if (tevent_req_is_nterror(req, &status)) {
 131                 return status;
 132         }
 133         fstrcpy(presp->data.winsresp, state->response);
 134         return NT_STATUS_OK;
 135 }