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.h"
  24 #include "libcli/smb2/smb2.h"
  25 #include "system/network.h"
  26 #include "lib/socket/netif.h"
  27 #include "param/param.h"
  28 #include "dynconfig/dynconfig.h"
  29 #include "smbd/process_model.h"
  30
  31 NTSTATUS server_service_samba3_smb_init(void);
  32
  33 /*
  34   initialise a server_context from a open socket and register a event handler
  35   for reading from that socket
  36 */
  37 static void samba3_smb_accept(struct stream_connection *conn)
  38 {
  39         int i;
  40         int fd = socket_get_fd(conn->socket);
  41         const char *prog;
  42         char *argv[2];
  43         char *reason;
  44
  45         close(0);
  46         close(1);
  47         dup2(fd, 0);
  48         dup2(fd, 1);
  49         dup2(fd, 2);
  50         for (i=3;i<256;i++) {
  51                 close(i);
  52         }
  53
  54         prog = lpcfg_parm_string(conn->lp_ctx, NULL, "samba3", "smbd");
  55
  56         if (prog == NULL) {
  57                 argv[0] = talloc_asprintf(conn, "%s/%s", dyn_BINDIR, "smbd3");
  58         }
  59         else {
  60                 argv[0] = talloc_strdup(conn, prog);
  61         }
  62
  63         if (argv[0] == NULL) {
  64                 stream_terminate_connection(conn, "out of memory");
  65                 return;
  66         }
  67         argv[1] = NULL;
  68
  69         execv(argv[0], argv);
  70
  71         /*
  72          * Should never get here
  73          */
  74         reason = talloc_asprintf(conn, "Could not execute %s", argv[0]);
  75         if (reason == NULL) {
  76                 stream_terminate_connection(conn, "out of memory");
  77                 return;
  78         }
  79         stream_terminate_connection(conn, reason);
  80         talloc_free(reason);
  81 }
  82
  83 static const struct stream_server_ops samba3_smb_stream_ops = {
  84         .name                   = "samba3",
  85         .accept_connection      = samba3_smb_accept,
  86 };
  87
  88 /*
  89   setup a listening socket on all the SMB ports for a particular address
  90 */
  91 static NTSTATUS samba3_add_socket(struct task_server *task,
  92                                   struct tevent_context *event_context,
  93                                   struct loadparm_context *lp_ctx,
  94                                   const struct model_ops *model_ops,
  95                                   const char *address)
  96 {
  97         const char **ports = lpcfg_smb_ports(lp_ctx);
  98         int i;
  99         NTSTATUS status;
 100
 101         for (i=0;ports[i];i++) {
 102                 uint16_t port = atoi(ports[i]);
 103                 if (port == 0) continue;
 104                 status = stream_setup_socket(task, event_context, lp_ctx,
 105                                              model_ops, &samba3_smb_stream_ops,
 106                                              "ip", address, &port,
 107                                              lpcfg_socket_options(lp_ctx),
 108                                              NULL);
 109                 NT_STATUS_NOT_OK_RETURN(status);
 110         }
 111
 112         return NT_STATUS_OK;
 113 }
 114
 115
 116 /*
 117   open the smb server sockets
 118 */
 119 static void samba3_smb_task_init(struct task_server *task)
 120 {
 121         NTSTATUS status;
 122         const struct model_ops *model_ops;
 123
 124         model_ops = process_model_startup("standard");
 125
 126         if (model_ops == NULL) {
 127                 goto failed;
 128         }
 129
 130         task_server_set_title(task, "task[samba3_smb]");
 131
 132         if (lpcfg_interfaces(task->lp_ctx)
 133             && lpcfg_bind_interfaces_only(task->lp_ctx)) {
 134                 int num_interfaces;
 135                 int i;
 136                 struct interface *ifaces;
 137
 138                 load_interface_list(task, task->lp_ctx, &ifaces);
 139
 140                 num_interfaces = iface_list_count(ifaces);
 141
 142                 /* We have been given an interfaces line, and been
 143                    told to only bind to those interfaces. Create a
 144                    socket per interface and bind to only these.
 145                 */
 146                 for(i = 0; i < num_interfaces; i++) {
 147                         const char *address = iface_list_n_ip(ifaces, i);
 148                         status = samba3_add_socket(task,
 149                                                    task->event_ctx,
 150                                                    task->lp_ctx,
 151                                                    model_ops, address);
 152                         if (!NT_STATUS_IS_OK(status)) goto failed;
 153                 }
 154         } else {
 155                 const char **wcard;
 156                 int i;
 157                 wcard = iface_list_wildcard(task, task->lp_ctx);
 158                 if (wcard == NULL) {
 159                         DEBUG(0,("No wildcard addresses available\n"));
 160                         goto failed;
 161                 }
 162                 for (i=0; wcard[i]; i++) {
 163                         status = samba3_add_socket(task,
 164                                                    task->event_ctx, task->lp_ctx,
 165                                                    model_ops,
 166                                                    wcard[i]);
 167                         if (!NT_STATUS_IS_OK(status)) goto failed;
 168                 }
 169                 talloc_free(wcard);
 170         }
 171
 172         return;
 173 failed:
 174         task_server_terminate(task, "Failed to startup samba3 smb task", true);
 175 }
 176
 177 /* called at smbd startup - register ourselves as a server service */
 178 NTSTATUS server_service_samba3_smb_init(void)
 179 {
 180         return register_server_service("samba3_smb", samba3_smb_task_init);
 181 }