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 "librpc/gen_ndr/ndr_winbind_c.h"
  23 #include "libsmb/nmblib.h"
  24 #include "lib/util/string_wrappers.h"
  25
  26 struct winbindd_wins_byname_state {
  27         struct tevent_context *ev;
  28         struct winbindd_request *request;
  29         struct sockaddr_storage *addrs;
  30         int num_addrs;
  31 };
  32
  33 static void winbindd_wins_byname_wins_done(struct tevent_req *subreq);
  34 static void winbindd_wins_byname_bcast_done(struct tevent_req *subreq);
  35
  36 struct tevent_req *winbindd_wins_byname_send(TALLOC_CTX *mem_ctx,
  37                                              struct tevent_context *ev,
  38                                              struct winbindd_cli_state *cli,
  39                                              struct winbindd_request *request)
  40 {
  41         struct tevent_req *req, *subreq;
  42         struct winbindd_wins_byname_state *state;
  43
  44         req = tevent_req_create(mem_ctx, &state,
  45                                 struct winbindd_wins_byname_state);
  46         if (req == NULL) {
  47                 return NULL;
  48         }
  49         state->ev = ev;
  50         state->request = request;
  51
  52         /* Ensure null termination */
  53         request->data.winsreq[sizeof(request->data.winsreq)-1]='\0';
  54
  55         DEBUG(3, ("[%5lu]: wins_byname %s\n", (unsigned long)cli->pid,
  56                   request->data.winsreq));
  57
  58         subreq = resolve_wins_send(state, ev, state->request->data.winsreq,
  59                                    0x20);
  60         if (tevent_req_nomem(subreq, req)) {
  61                 return tevent_req_post(req, ev);
  62         }
  63         tevent_req_set_callback(subreq, winbindd_wins_byname_wins_done, req);
  64         return req;
  65 }
  66
  67 static void winbindd_wins_byname_wins_done(struct tevent_req *subreq)
  68 {
  69         struct tevent_req *req = tevent_req_callback_data(
  70                 subreq, struct tevent_req);
  71         struct winbindd_wins_byname_state *state = tevent_req_data(
  72                 req, struct winbindd_wins_byname_state);
  73         NTSTATUS status;
  74
  75         status = resolve_wins_recv(subreq, talloc_tos(), &state->addrs,
  76                                    &state->num_addrs, NULL);
  77         TALLOC_FREE(subreq);
  78         if (NT_STATUS_IS_OK(status)) {
  79                 tevent_req_done(req);
  80                 return;
  81         }
  82         subreq = name_resolve_bcast_send(state, state->ev,
  83                                          state->request->data.winsreq, 0x20);
  84         if (tevent_req_nomem(subreq, req)) {
  85                 return;
  86         }
  87         tevent_req_set_callback(subreq, winbindd_wins_byname_bcast_done, req);
  88 }
  89
  90 static void winbindd_wins_byname_bcast_done(struct tevent_req *subreq)
  91 {
  92         struct tevent_req *req = tevent_req_callback_data(
  93                 subreq, struct tevent_req);
  94         struct winbindd_wins_byname_state *state = tevent_req_data(
  95                 req, struct winbindd_wins_byname_state);
  96         NTSTATUS status;
  97
  98         status = name_resolve_bcast_recv(subreq, talloc_tos(), &state->addrs,
  99                                          &state->num_addrs);
 100         TALLOC_FREE(subreq);
 101         if (tevent_req_nterror(req, status)) {
 102                 return;
 103         }
 104         tevent_req_done(req);
 105 }
 106
 107 NTSTATUS winbindd_wins_byname_recv(struct tevent_req *req,
 108                                    struct winbindd_response *presp)
 109 {
 110         struct winbindd_wins_byname_state *state = tevent_req_data(
 111                 req, struct winbindd_wins_byname_state);
 112         char *response;
 113         NTSTATUS status;
 114         int i;
 115
 116         if (tevent_req_is_nterror(req, &status)) {
 117                 return status;
 118         }
 119
 120         response = talloc_strdup(talloc_tos(), "");
 121         if (response == NULL) {
 122                 return NT_STATUS_NO_MEMORY;
 123         }
 124
 125         for (i=0; i<state->num_addrs; i++) {
 126                 char addr[INET6_ADDRSTRLEN];
 127                 print_sockaddr(addr, sizeof(addr), &state->addrs[i]);
 128
 129                 response = talloc_asprintf_append_buffer(
 130                         response, "%s%s", addr,
 131                         i < (state->num_addrs-1) ? " " : "");
 132                 if (response == NULL) {
 133                         return NT_STATUS_NO_MEMORY;
 134                 }
 135         }
 136
 137         response = talloc_asprintf_append_buffer(
 138                 response, "\t%s\n", state->request->data.winsreq);
 139         if (response == NULL) {
 140                 return NT_STATUS_NO_MEMORY;
 141         }
 142
 143         if (talloc_get_size(response) > sizeof(presp->data.winsresp)) {
 144                 TALLOC_FREE(response);
 145                 return NT_STATUS_MARSHALL_OVERFLOW;
 146         }
 147         fstrcpy(presp->data.winsresp, response);
 148         TALLOC_FREE(response);
 149         return NT_STATUS_OK;
 150 }