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 /*
  32   initialise a server_context from a open socket and register a event handler
  33   for reading from that socket
  34 */
  35 static void samba3_smb_accept(struct stream_connection *conn)
  36 {
  37         int i;
  38         int fd = socket_get_fd(conn->socket);
  39         const char *prog;
  40         char *argv[2];
  41         char *reason;
  42         extern char **environ;
  43
  44         close(0);
  45         close(1);
  46         dup2(fd, 0);
  47         dup2(fd, 1);
  48         dup2(fd, 2);
  49         for (i=3;i<256;i++) {
  50                 close(i);
  51         }
  52
  53         prog = lp_parm_string(conn->lp_ctx, NULL, "samba3", "smbd");
  54
  55         if (prog == NULL) {
  56                 argv[0] = talloc_asprintf(conn, "%s/%s", dyn_BINDIR, "smbd3");
  57         }
  58         else {
  59                 argv[0] = talloc_strdup(conn, prog);
  60         }
  61
  62         if (argv[0] == NULL) {
  63                 stream_terminate_connection(conn, "out of memory");
  64                 return;
  65         }
  66         argv[1] = NULL;
  67
  68         execve(argv[0], argv, environ);
  69
  70         /*
  71          * Should never get here
  72          */
  73         reason = talloc_asprintf(conn, "Could not execute %s", argv[0]);
  74         if (reason == NULL) {
  75                 stream_terminate_connection(conn, "out of memory");
  76                 return;
  77         }
  78         stream_terminate_connection(conn, reason);
  79         talloc_free(reason);
  80 }
  81
  82 static const struct stream_server_ops samba3_smb_stream_ops = {
  83         .name                   = "samba3",
  84         .accept_connection      = samba3_smb_accept,
  85 };
  86
  87 /*
  88   setup a listening socket on all the SMB ports for a particular address
  89 */
  90 static NTSTATUS samba3_add_socket(struct tevent_context *event_context,
  91                                   struct loadparm_context *lp_ctx,
  92                                   const struct model_ops *model_ops,
  93                                   const char *address)
  94 {
  95         const char **ports = lp_smb_ports(lp_ctx);
  96         int i;
  97         NTSTATUS status;
  98
  99         for (i=0;ports[i];i++) {
 100                 uint16_t port = atoi(ports[i]);
 101                 if (port == 0) continue;
 102                 status = stream_setup_socket(event_context, lp_ctx,
 103                                              model_ops, &samba3_smb_stream_ops,
 104                                              "ip", address, &port,
 105                                              lp_socket_options(lp_ctx),
 106                                              NULL);
 107                 NT_STATUS_NOT_OK_RETURN(status);
 108         }
 109
 110         return NT_STATUS_OK;
 111 }
 112
 113
 114 /*
 115   open the smb server sockets
 116 */
 117 static void samba3_smb_task_init(struct task_server *task)
 118 {
 119         NTSTATUS status;
 120         const struct model_ops *model_ops;
 121
 122         model_ops = process_model_startup(task->event_ctx, "standard");
 123
 124         if (model_ops == NULL) {
 125                 goto failed;
 126         }
 127
 128         task_server_set_title(task, "task[samba3_smb]");
 129
 130         if (lp_interfaces(task->lp_ctx)
 131             && lp_bind_interfaces_only(task->lp_ctx)) {
 132                 int num_interfaces;
 133                 int i;
 134                 struct interface *ifaces;
 135
 136                 load_interfaces(task, lp_interfaces(task->lp_ctx), &ifaces);
 137
 138                 num_interfaces = iface_count(ifaces);
 139
 140                 /* We have been given an interfaces line, and been
 141                    told to only bind to those interfaces. Create a
 142                    socket per interface and bind to only these.
 143                 */
 144                 for(i = 0; i < num_interfaces; i++) {
 145                         const char *address = iface_n_ip(ifaces, i);
 146                         status = samba3_add_socket(task->event_ctx,
 147                                                    task->lp_ctx,
 148                                                    model_ops, address);
 149                         if (!NT_STATUS_IS_OK(status)) goto failed;
 150                 }
 151         } else {
 152                 /* Just bind to lp_socket_address() (usually 0.0.0.0) */
 153                 status = samba3_add_socket(task->event_ctx, task->lp_ctx,
 154                                            model_ops,
 155                                            lp_socket_address(task->lp_ctx));
 156                 if (!NT_STATUS_IS_OK(status)) goto failed;
 157         }
 158
 159         return;
 160 failed:
 161         task_server_terminate(task, "Failed to startup samba3 smb task", true);
 162 }
 163
 164 /* called at smbd startup - register ourselves as a server service */
 165 NTSTATUS server_service_samba3_smb_init(void)
 166 {
 167         return register_server_service("samba3_smb", samba3_smb_task_init);
 168 }