source: branches/samba-3.5.x/source4/smb_server/smb_samba3.c

/*
   Unix SMB/CIFS implementation.

   process incoming connections and fork a samba3 in inetd mode

   Copyright (C) Stefan Metzmacher      2008

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"
#include "smbd/service.h"
#include "libcli/smb2/smb2.h"
#include "system/network.h"
#include "lib/socket/netif.h"
#include "param/param.h"
#include "dynconfig/dynconfig.h"
#include "smbd/process_model.h"

/*
  initialise a server_context from a open socket and register a event handler
  for reading from that socket
*/
static void samba3_smb_accept(struct stream_connection *conn)
{
        int i;
        int fd = socket_get_fd(conn->socket);
        const char *prog;
        char *argv[2];
        char *reason;
        extern char **environ;

        close(0);
        close(1);
        dup2(fd, 0);
        dup2(fd, 1);
        dup2(fd, 2);
        for (i=3;i<256;i++) {
                close(i);
        }

        prog = lp_parm_string(conn->lp_ctx, NULL, "samba3", "smbd");

        if (prog == NULL) {
                argv[0] = talloc_asprintf(conn, "%s/%s", dyn_BINDIR, "smbd3");
        }
        else {
                argv[0] = talloc_strdup(conn, prog);
        }

        if (argv[0] == NULL) {
                stream_terminate_connection(conn, "out of memory");
                return;
        }
        argv[1] = NULL;

        execve(argv[0], argv, environ);

        /*
         * Should never get here
         */
        reason = talloc_asprintf(conn, "Could not execute %s", argv[0]);
        if (reason == NULL) {
                stream_terminate_connection(conn, "out of memory");
                return;
        }
        stream_terminate_connection(conn, reason);
        talloc_free(reason);
}

static const struct stream_server_ops samba3_smb_stream_ops = {
        .name                   = "samba3",
        .accept_connection      = samba3_smb_accept,
};

/*
  setup a listening socket on all the SMB ports for a particular address
*/
static NTSTATUS samba3_add_socket(struct tevent_context *event_context,
                                  struct loadparm_context *lp_ctx,
                                  const struct model_ops *model_ops,
                                  const char *address)
{
        const char **ports = lp_smb_ports(lp_ctx);
        int i;
        NTSTATUS status;

        for (i=0;ports[i];i++) {
                uint16_t port = atoi(ports[i]);
                if (port == 0) continue;
                status = stream_setup_socket(event_context, lp_ctx,
                                             model_ops, &samba3_smb_stream_ops,
                                             "ip", address, &port,
                                             lp_socket_options(lp_ctx),
                                             NULL);
                NT_STATUS_NOT_OK_RETURN(status);
        }

        return NT_STATUS_OK;
}


/*
  open the smb server sockets
*/
static void samba3_smb_task_init(struct task_server *task)
{
        NTSTATUS status;
        const struct model_ops *model_ops;

        model_ops = process_model_startup(task->event_ctx, "standard");

        if (model_ops == NULL) {
                goto failed;
        }

        task_server_set_title(task, "task[samba3_smb]");

        if (lp_interfaces(task->lp_ctx)
            && lp_bind_interfaces_only(task->lp_ctx)) {
                int num_interfaces;
                int i;
                struct interface *ifaces;

                load_interfaces(task, lp_interfaces(task->lp_ctx), &ifaces);

                num_interfaces = iface_count(ifaces);

                /* We have been given an interfaces line, and been
                   told to only bind to those interfaces. Create a
                   socket per interface and bind to only these.
                */
                for(i = 0; i < num_interfaces; i++) {
                        const char *address = iface_n_ip(ifaces, i);
                        status = samba3_add_socket(task->event_ctx,
                                                   task->lp_ctx,
                                                   model_ops, address);
                        if (!NT_STATUS_IS_OK(status)) goto failed;
                }
        } else {
                /* Just bind to lp_socket_address() (usually 0.0.0.0) */
                status = samba3_add_socket(task->event_ctx, task->lp_ctx,
                                           model_ops,
                                           lp_socket_address(task->lp_ctx));
                if (!NT_STATUS_IS_OK(status)) goto failed;
        }

        return;
failed:
        task_server_terminate(task, "Failed to startup samba3 smb task", true);
}

/* called at smbd startup - register ourselves as a server service */
NTSTATUS server_service_samba3_smb_init(void)
{
        return register_server_service("samba3_smb", samba3_smb_task_init);
}