source/smbd/sockinit.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Copyright (C) Andrew Tridgell                1992-1998
   5    Copyright (C) James Peach                    2007
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "smb_launchd.h"
  23
  24 extern pstring user_socket_options;
  25
  26 static int init_sockets_smbd(const char *smb_ports, int listenset[FD_SETSIZE])
  27 {
  28         int num_interfaces = iface_count();
  29         char * ports;
  30         int num_sockets = 0;
  31         int i, s;
  32
  33         /* use a reasonable default set of ports - listing on 445 and 139 */
  34         if (!smb_ports) {
  35                 ports = lp_smb_ports();
  36                 if (!ports || !*ports) {
  37                         ports = smb_xstrdup(SMB_PORTS);
  38                 } else {
  39                         ports = smb_xstrdup(ports);
  40                 }
  41         } else {
  42                 ports = smb_xstrdup(smb_ports);
  43         }
  44
  45         if (lp_interfaces() && lp_bind_interfaces_only()) {
  46                 /* We have been given an interfaces line, and been
  47                    told to only bind to those interfaces. Create a
  48                    socket per interface and bind to only these.
  49                 */
  50
  51                 /* Now open a listen socket for each of the
  52                    interfaces. */
  53                 for(i = 0; i < num_interfaces; i++) {
  54                         struct in_addr *ifip = iface_n_ip(i);
  55                         fstring tok;
  56                         const char *ptr;
  57
  58                         if(ifip == NULL) {
  59                                 DEBUG(0,("init_sockets_smbd: interface %d has "
  60                                         "NULL IP address !\n", i));
  61                                 continue;
  62                         }
  63
  64                         for (ptr=ports; next_token(&ptr, tok, " \t,",
  65                                                 sizeof(tok)); ) {
  66                                 unsigned port = atoi(tok);
  67                                 if (port == 0 || port > 0xffff) {
  68                                         continue;
  69                                 }
  70                                 s = listenset[num_sockets] =
  71                                         open_socket_in(SOCK_STREAM,
  72                                                         port,
  73                                                         0,
  74                                                         ifip->s_addr,
  75                                                         True);
  76                                 if(s == -1)
  77                                         return 0;
  78
  79                                 /* ready to listen */
  80                                 set_socket_options(s,"SO_KEEPALIVE");
  81                                 set_socket_options(s,user_socket_options);
  82
  83                                 /* Set server socket to non-blocking
  84                                  * for the accept. */
  85                                 set_blocking(s,False);
  86
  87                                 if (listen(s, SMBD_LISTEN_BACKLOG) == -1) {
  88                                         DEBUG(0,("listen: %s\n",
  89                                                 strerror(errno)));
  90                                         close(s);
  91                                         return 0;
  92                                 }
  93
  94                                 num_sockets++;
  95                                 if (num_sockets >= FD_SETSIZE) {
  96                                         DEBUG(0,("init_sockets_smbd: "
  97                                         "Too many sockets to bind to\n"));
  98                                         return 0;
  99                                 }
 100                         }
 101                 }
 102         } else {
 103                 /* Just bind to 0.0.0.0 - accept connections
 104                    from anywhere. */
 105
 106                 fstring tok;
 107                 const char *ptr;
 108
 109                 num_interfaces = 1;
 110
 111                 for (ptr=ports; next_token(&ptr, tok, " \t,", sizeof(tok)); ) {
 112                         unsigned port = atoi(tok);
 113                         if (port == 0  || port > 0xffff) continue;
 114                         /* open an incoming socket */
 115                         s = open_socket_in(SOCK_STREAM, port, 0,
 116                                            interpret_addr(lp_socket_address()),
 117                                            True);
 118                         if (s == -1)
 119                                 return 0;
 120
 121                         /* ready to listen */
 122                         set_socket_options(s,"SO_KEEPALIVE");
 123                         set_socket_options(s,user_socket_options);
 124
 125                         /* Set server socket to non-blocking for the accept. */
 126                         set_blocking(s,False);
 127
 128                         if (listen(s, SMBD_LISTEN_BACKLOG) == -1) {
 129                                 DEBUG(0,("init_sockets_smbd: listen: %s\n",
 130                                          strerror(errno)));
 131                                 close(s);
 132                                 return 0;
 133                         }
 134
 135                         listenset[num_sockets] = s;
 136                         num_sockets++;
 137
 138                         if (num_sockets >= FD_SETSIZE) {
 139                                 DEBUG(0,("init_sockets_smbd: "
 140                                         "Too many sockets to bind to\n"));
 141                                 return 0;
 142                         }
 143                 }
 144         }
 145
 146         SAFE_FREE(ports);
 147         return num_sockets;
 148 }
 149
 150 static int init_sockets_launchd(const struct smb_launch_info *linfo,
 151                                 const char * smb_ports,
 152                                 int listenset[FD_SETSIZE])
 153 {
 154         int num_sockets;
 155         int i;
 156
 157         /* The launchd service configuration does not have to provide sockets,
 158          * even though it's basically useless without it.
 159          */
 160         if (!linfo->num_sockets) {
 161                 return init_sockets_smbd(smb_ports, listenset);
 162         }
 163
 164         /* Make sure we don't get more sockets than we can handle. */
 165         num_sockets = MIN(FD_SETSIZE, linfo->num_sockets);
 166         memcpy(listenset, linfo->socket_list, num_sockets * sizeof(int));
 167
 168         /* Get the sockets ready. This could be hoisted into
 169          * open_sockets_smbd(), but the order of socket operations might
 170          * matter for some platforms, so this approach seems less risky.
 171          *      --jpeach
 172          */
 173         for (i = 0; i < num_sockets; ++i) {
 174                 set_socket_options(listenset[i], "SO_KEEPALIVE");
 175                 set_socket_options(listenset[i], user_socket_options);
 176
 177                 /* Set server socket to non-blocking for the accept. */
 178                 set_blocking(listenset[i], False);
 179         }
 180
 181         return num_sockets;
 182 }
 183
 184 /* This function is responsible for opening (or retrieving) all the sockets we
 185  * smbd will be listening on. It should apply all the configured socket options
 186  * and return the number of valid sockets in listenset.
 187  */
 188 int smbd_sockinit(const char *cmdline_ports, int listenset[FD_SETSIZE],
 189                         struct timeval *idle)
 190 {
 191         int num_sockets;
 192         struct smb_launch_info linfo;
 193
 194         ZERO_STRUCTP(idle);
 195
 196         if (smb_launchd_checkin(&linfo)) {
 197                 /* We are running under launchd and launchd has
 198                  * opened some sockets for us.
 199                  */
 200                 num_sockets = init_sockets_launchd(&linfo,
 201                                             cmdline_ports,
 202                                             listenset);
 203                 idle->tv_sec = linfo.idle_timeout_secs;
 204                 smb_launchd_checkout(&linfo);
 205         } else {
 206                 num_sockets = init_sockets_smbd(cmdline_ports,
 207                                             listenset);
 208         }
 209
 210         return num_sockets;
 211 }