source4/smb_server/smb_samba3.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    process incoming connections and fork a samba3 in inetd mode
   5
   6    Copyright (C) Stefan Metzmacher      2008
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "smbd/service_task.h"
  24 #include "smbd/service_stream.h"
  25 #include "smbd/service.h"
  26 #include "lib/messaging/irpc.h"
  27 #include "lib/stream/packet.h"
  28 #include "lib/socket/socket.h"
  29 #include "libcli/smb2/smb2.h"
  30 #include "smb_server/smb2/smb2_server.h"
  31 #include "system/network.h"
  32 #include "lib/socket/netif.h"
  33 #include "param/share.h"
  34 #include "dsdb/samdb/samdb.h"
  35 #include "param/param.h"
  36 #include "dynconfig/dynconfig.h"
  37 #include "smbd/process_model.h"
  38
  39 /*
  40   initialise a server_context from a open socket and register a event handler
  41   for reading from that socket
  42 */
  43 static void samba3_smb_accept(struct stream_connection *conn)
  44 {
  45         int i;
  46         int fd = socket_get_fd(conn->socket);
  47         const char *prog;
  48         char *argv[2];
  49         char *reason;
  50         extern char **environ;
  51
  52         close(0);
  53         close(1);
  54         dup2(fd, 0);
  55         dup2(fd, 1);
  56         dup2(fd, 2);
  57         for (i=3;i<256;i++) {
  58                 close(i);
  59         }
  60
  61         prog = lp_parm_string(conn->lp_ctx, NULL, "samba3", "smbd");
  62
  63         if (prog == NULL) {
  64                 argv[0] = talloc_asprintf(conn, "%s/%s", dyn_BINDIR, "smbd3");
  65         }
  66         else {
  67                 argv[0] = talloc_strdup(conn, prog);
  68         }
  69
  70         if (argv[0] == NULL) {
  71                 stream_terminate_connection(conn, "out of memory");
  72                 return;
  73         }
  74         argv[1] = NULL;
  75
  76         execve(argv[0], argv, environ);
  77
  78         /*
  79          * Should never get here
  80          */
  81         reason = talloc_asprintf(conn, "Could not execute %s", argv[0]);
  82         if (reason == NULL) {
  83                 stream_terminate_connection(conn, "out of memory");
  84                 return;
  85         }
  86         stream_terminate_connection(conn, reason);
  87         talloc_free(reason);
  88 }
  89
  90 static const struct stream_server_ops samba3_smb_stream_ops = {
  91         .name                   = "samba3",
  92         .accept_connection      = samba3_smb_accept,
  93 };
  94
  95 /*
  96   setup a listening socket on all the SMB ports for a particular address
  97 */
  98 static NTSTATUS samba3_add_socket(struct event_context *event_context,
  99                                   struct loadparm_context *lp_ctx,
 100                                   const struct model_ops *model_ops,
 101                                   const char *address)
 102 {
 103         const char **ports = lp_smb_ports(lp_ctx);
 104         int i;
 105         NTSTATUS status;
 106
 107         for (i=0;ports[i];i++) {
 108                 uint16_t port = atoi(ports[i]);
 109                 if (port == 0) continue;
 110                 status = stream_setup_socket(event_context, lp_ctx,
 111                                              model_ops, &samba3_smb_stream_ops,
 112                                              "ip", address, &port,
 113                                              lp_socket_options(lp_ctx),
 114                                              NULL);
 115                 NT_STATUS_NOT_OK_RETURN(status);
 116         }
 117
 118         return NT_STATUS_OK;
 119 }
 120
 121
 122 /*
 123   open the smb server sockets
 124 */
 125 static void samba3_smb_task_init(struct task_server *task)
 126 {
 127         NTSTATUS status;
 128         const struct model_ops *model_ops;
 129
 130         model_ops = process_model_startup(task->event_ctx, "standard");
 131
 132         if (model_ops == NULL) {
 133                 goto failed;
 134         }
 135
 136         task_server_set_title(task, "task[samba3_smb]");
 137
 138         if (lp_interfaces(task->lp_ctx)
 139             && lp_bind_interfaces_only(task->lp_ctx)) {
 140                 int num_interfaces;
 141                 int i;
 142                 struct interface *ifaces;
 143
 144                 load_interfaces(task, lp_interfaces(task->lp_ctx), &ifaces);
 145
 146                 num_interfaces = iface_count(ifaces);
 147
 148                 /* We have been given an interfaces line, and been
 149                    told to only bind to those interfaces. Create a
 150                    socket per interface and bind to only these.
 151                 */
 152                 for(i = 0; i < num_interfaces; i++) {
 153                         const char *address = iface_n_ip(ifaces, i);
 154                         status = samba3_add_socket(task->event_ctx,
 155                                                    task->lp_ctx,
 156                                                    model_ops, address);
 157                         if (!NT_STATUS_IS_OK(status)) goto failed;
 158                 }
 159         } else {
 160                 /* Just bind to lp_socket_address() (usually 0.0.0.0) */
 161                 status = samba3_add_socket(task->event_ctx, task->lp_ctx,
 162                                            model_ops,
 163                                            lp_socket_address(task->lp_ctx));
 164                 if (!NT_STATUS_IS_OK(status)) goto failed;
 165         }
 166
 167         return;
 168 failed:
 169         task_server_terminate(task, "Failed to startup samba3 smb task");
 170 }
 171
 172 /* called at smbd startup - register ourselves as a server service */
 173 NTSTATUS server_service_samba3_smb_init(void)
 174 {
 175         return register_server_service("samba3_smb", samba3_smb_task_init);
 176 }