LCOV - code coverage report
Current view: top level - source3/client - dnsbrowse.c (source / functions) Hit Total Coverage
Test: coverage report for abartlet/fix-coverage dd10fb34 Lines: 0 3 0.0 %
Date: 2021-09-23 10:06:22 Functions: 0 1 0.0 %

          Line data    Source code
       1             : /*
       2             :    Unix SMB/CIFS implementation.
       3             :    DNS-SD browse client
       4             :    Copyright (C) Rishi Srivatsavai 2007
       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 "client/client_proto.h"
      22             : 
      23             : #ifdef WITH_DNSSD_SUPPORT
      24             : 
      25             : #include <dns_sd.h>
      26             : #include "system/select.h"
      27             : 
      28             : /* Holds service instances found during DNS browse */
      29             : struct mdns_smbsrv_result
      30             : {
      31             :         char *serviceName;
      32             :         char *regType;
      33             :         char *domain;
      34             :         uint32_t ifIndex;
      35             :         struct mdns_smbsrv_result *nextResult;
      36             : };
      37             : 
      38             : /* Maintains state during DNS browse */
      39             : struct mdns_browse_state
      40             : {
      41             :         struct mdns_smbsrv_result *listhead; /* Browse result list head */
      42             :         int browseDone;
      43             : 
      44             : };
      45             : 
      46             : 
      47             : static void
      48             : do_smb_resolve_reply (DNSServiceRef sdRef, DNSServiceFlags flags,
      49             :                 uint32_t interfaceIndex, DNSServiceErrorType errorCode,
      50             :                 const char *fullname, const char *hosttarget, uint16_t port,
      51             :                 uint16_t txtLen, const unsigned char *txtRecord, void *context)
      52             : {
      53             :         printf("SMB service available on %s port %u\n",
      54             :                 hosttarget, ntohs(port));
      55             : }
      56             : 
      57             : 
      58             : static void do_smb_resolve(struct mdns_smbsrv_result *browsesrv)
      59             : {
      60             :         DNSServiceRef mdns_conn_sdref = NULL;
      61             :         int mdnsfd;
      62             :         int fdsetsz;
      63             :         int ret;
      64             :         struct timeval tv;
      65             :         DNSServiceErrorType err;
      66             : 
      67             :         TALLOC_CTX * ctx = talloc_tos();
      68             : 
      69             :         err = DNSServiceResolve(&mdns_conn_sdref, 0 /* flags */,
      70             :                 browsesrv->ifIndex,
      71             :                 browsesrv->serviceName, browsesrv->regType, browsesrv->domain,
      72             :                 do_smb_resolve_reply, NULL);
      73             : 
      74             :         if (err != kDNSServiceErr_NoError) {
      75             :                 return;
      76             :         }
      77             : 
      78             :         mdnsfd = DNSServiceRefSockFD(mdns_conn_sdref);
      79             :         for (;;)  {
      80             :                 int revents;
      81             : 
      82             :                 ret = poll_one_fd(mdnsfd, POLLIN|POLLHUP, 1000, &revents);
      83             :                 if (ret <= 0 && errno != EINTR) {
      84             :                         break;
      85             :                 }
      86             : 
      87             :                 if (revents & (POLLIN|POLLHUP|POLLERR)) {
      88             :                         /* Invoke callback function */
      89             :                         DNSServiceProcessResult(mdns_conn_sdref);
      90             :                         break;
      91             :                 }
      92             :         }
      93             : 
      94             :         TALLOC_FREE(fdset);
      95             :         DNSServiceRefDeallocate(mdns_conn_sdref);
      96             : }
      97             : 
      98             : 
      99             : static void
     100             : do_smb_browse_reply(DNSServiceRef sdRef, DNSServiceFlags flags,
     101             :         uint32_t interfaceIndex, DNSServiceErrorType errorCode,
     102             :         const char  *serviceName, const char *regtype,
     103             :         const char  *replyDomain, void  *context)
     104             : {
     105             :         struct mdns_browse_state *bstatep = (struct mdns_browse_state *)context;
     106             :         struct mdns_smbsrv_result *bresult;
     107             : 
     108             :         if (bstatep == NULL) {
     109             :                 return;
     110             :         }
     111             : 
     112             :         if (errorCode != kDNSServiceErr_NoError) {
     113             :                 bstatep->browseDone = 1;
     114             :                 return;
     115             :         }
     116             : 
     117             :         if (flags & kDNSServiceFlagsMoreComing) {
     118             :                 bstatep->browseDone = 0;
     119             :         } else {
     120             :                 bstatep->browseDone = 1;
     121             :         }
     122             : 
     123             :         if (!(flags & kDNSServiceFlagsAdd)) {
     124             :                 return;
     125             :         }
     126             : 
     127             :         bresult = talloc_array(talloc_tos(), struct mdns_smbsrv_result, 1);
     128             :         if (bresult == NULL) {
     129             :                 return;
     130             :         }
     131             : 
     132             :         if (bstatep->listhead != NULL) {
     133             :                 bresult->nextResult = bstatep->listhead;
     134             :         }
     135             : 
     136             :         bresult->serviceName = talloc_strdup(talloc_tos(), serviceName);
     137             :         bresult->regType = talloc_strdup(talloc_tos(), regtype);
     138             :         bresult->domain = talloc_strdup(talloc_tos(), replyDomain);
     139             :         bresult->ifIndex = interfaceIndex;
     140             :         bstatep->listhead = bresult;
     141             : }
     142             : 
     143             : int do_smb_browse(void)
     144             : {
     145             :         int mdnsfd;
     146             :         int fdsetsz;
     147             :         int ret;
     148             :         struct mdns_browse_state bstate;
     149             :         struct mdns_smbsrv_result *resptr;
     150             :         struct timeval tv;
     151             :         DNSServiceRef mdns_conn_sdref = NULL;
     152             :         DNSServiceErrorType err;
     153             : 
     154             :         TALLOC_CTX * ctx = talloc_stackframe();
     155             : 
     156             :         ZERO_STRUCT(bstate);
     157             : 
     158             :         err = DNSServiceBrowse(&mdns_conn_sdref, 0, 0, "_smb._tcp", "",
     159             :                         do_smb_browse_reply, &bstate);
     160             : 
     161             :         if (err != kDNSServiceErr_NoError) {
     162             :                 d_printf("Error connecting to the Multicast DNS daemon\n");
     163             :                 TALLOC_FREE(ctx);
     164             :                 return 1;
     165             :         }
     166             : 
     167             :         mdnsfd = DNSServiceRefSockFD(mdns_conn_sdref);
     168             :         for (;;)  {
     169             :                 int revents;
     170             : 
     171             :                 ret = poll_one_fd(mdnsfd, POLLIN|POLLHUP, 1000, &revents);
     172             :                 if (ret <= 0 && errno != EINTR) {
     173             :                         break;
     174             :                 }
     175             : 
     176             :                 if (revents & (POLLIN|POLLHUP|POLLERR)) {
     177             :                         /* Invoke callback function */
     178             :                         if (DNSServiceProcessResult(mdns_conn_sdref)) {
     179             :                                 break;
     180             :                         }
     181             :                         if (bstate.browseDone) {
     182             :                                 break;
     183             :                         }
     184             :                 }
     185             :         }
     186             : 
     187             :         DNSServiceRefDeallocate(mdns_conn_sdref);
     188             : 
     189             :         if (bstate.listhead != NULL) {
     190             :                 resptr = bstate.listhead;
     191             :                 while (resptr != NULL) {
     192             :                         struct mdns_smbsrv_result *oldresptr;
     193             :                         oldresptr = resptr;
     194             : 
     195             :                         /* Resolve smb service instance */
     196             :                         do_smb_resolve(resptr);
     197             : 
     198             :                         resptr = resptr->nextResult;
     199             :                 }
     200             :         }
     201             : 
     202             :         TALLOC_FREE(ctx);
     203             :         return 0;
     204             : }
     205             : 
     206             : #else /* WITH_DNSSD_SUPPORT */
     207             : 
     208           0 : int do_smb_browse(void)
     209             : {
     210           0 :     d_printf("DNS-SD browsing is not supported on this platform\n");
     211           0 :     return 1;
     212             : }
     213             : 
     214             : #endif /* WITH_DNSSD_SUPPORT */
     215             : 
     216             : 

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