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         int 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         DEBUG(3, ("[%5lu]: wins_byname %s\n", (unsigned long)cli->pid,
  57                   request->data.winsreq));
  58
  59         subreq = resolve_wins_send(state, ev, state->request->data.winsreq,
  60                                    0x20);
  61         if (tevent_req_nomem(subreq, req)) {
  62                 return tevent_req_post(req, ev);
  63         }
  64         tevent_req_set_callback(subreq, winbindd_wins_byname_wins_done, req);
  65         return req;
  66 }
  67
  68 static void winbindd_wins_byname_wins_done(struct tevent_req *subreq)
  69 {
  70         struct tevent_req *req = tevent_req_callback_data(
  71                 subreq, struct tevent_req);
  72         struct winbindd_wins_byname_state *state = tevent_req_data(
  73                 req, struct winbindd_wins_byname_state);
  74         NTSTATUS status;
  75
  76         status = resolve_wins_recv(subreq, talloc_tos(), &state->addrs,
  77                                    &state->num_addrs, NULL);
  78         TALLOC_FREE(subreq);
  79         if (NT_STATUS_IS_OK(status)) {
  80                 tevent_req_done(req);
  81                 return;
  82         }
  83         subreq = name_resolve_bcast_send(state, state->ev,
  84                                          state->request->data.winsreq, 0x20);
  85         if (tevent_req_nomem(subreq, req)) {
  86                 return;
  87         }
  88         tevent_req_set_callback(subreq, winbindd_wins_byname_bcast_done, req);
  89 }
  90
  91 static void winbindd_wins_byname_bcast_done(struct tevent_req *subreq)
  92 {
  93         struct tevent_req *req = tevent_req_callback_data(
  94                 subreq, struct tevent_req);
  95         struct winbindd_wins_byname_state *state = tevent_req_data(
  96                 req, struct winbindd_wins_byname_state);
  97         NTSTATUS status;
  98
  99         status = name_resolve_bcast_recv(subreq, talloc_tos(), &state->addrs,
 100                                          &state->num_addrs);
 101         TALLOC_FREE(subreq);
 102         if (tevent_req_nterror(req, status)) {
 103                 return;
 104         }
 105         tevent_req_done(req);
 106 }
 107
 108 NTSTATUS winbindd_wins_byname_recv(struct tevent_req *req,
 109                                    struct winbindd_response *presp)
 110 {
 111         struct winbindd_wins_byname_state *state = tevent_req_data(
 112                 req, struct winbindd_wins_byname_state);
 113         char *response;
 114         NTSTATUS status;
 115         int i;
 116
 117         if (tevent_req_is_nterror(req, &status)) {
 118                 return status;
 119         }
 120
 121         response = talloc_strdup(talloc_tos(), "");
 122         if (response == NULL) {
 123                 return NT_STATUS_NO_MEMORY;
 124         }
 125
 126         for (i=0; i<state->num_addrs; i++) {
 127                 char addr[INET6_ADDRSTRLEN];
 128                 print_sockaddr(addr, sizeof(addr), &state->addrs[i]);
 129
 130                 response = talloc_asprintf_append_buffer(
 131                         response, "%s%s", addr,
 132                         i < (state->num_addrs-1) ? " " : "");
 133                 if (response == NULL) {
 134                         return NT_STATUS_NO_MEMORY;
 135                 }
 136         }
 137
 138         response = talloc_asprintf_append_buffer(
 139                 response, "\t%s\n", state->request->data.winsreq);
 140         if (response == NULL) {
 141                 return NT_STATUS_NO_MEMORY;
 142         }
 143
 144         if (talloc_get_size(response) > sizeof(presp->data.winsresp)) {
 145                 TALLOC_FREE(response);
 146                 return NT_STATUS_MARSHALL_OVERFLOW;
 147         }
 148         fstrcpy(presp->data.winsresp, response);
 149         TALLOC_FREE(response);
 150         return NT_STATUS_OK;
 151 }