path: root/login/programs/request.c

/* Copyright (C) 1997 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Mark Kettenis <kettenis@phys.uva.nl>, 1997.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <assert.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <utmp.h>
#include <libintl.h>

#include "utmpd.h"
#include "utmpd-private.h"


/* Prototypes for the local functions.  */
static int process_request (client_connection *connection);
static int send_reply (client_connection *connect, const reply_header *reply);

static int do_setutent (client_connection *connection);
static int do_getutent (client_connection *connection);
static int do_endutent (client_connection *connection);
static int do_getutline (client_connection *connection);
static int do_getutid (client_connection *connection);
static int do_pututline (client_connection *connection);
static int do_updwtmp (client_connection *connection);

static int internal_getut_r (client_connection *connection,
			     const struct utmp *id, struct utmp *buffer);


/* Read data from the client on CONNECTION.  */
int
read_data (client_connection *connection)
{
  ssize_t nbytes;

  assert (connection);
  assert ((connection->read_end - connection->read_ptr) > 0);

  /* Read data.  */
  nbytes = read (connection->sock, connection->read_ptr,
		 connection->read_end - connection->read_ptr);
  if (nbytes > 0)
    {
      size_t total_bytes;

      /* Update read pointer.  */
      connection->read_ptr += nbytes;

      /* Check if we have a complete request header.  */
      total_bytes = connection->read_ptr - connection->read_base;
      if (total_bytes >= sizeof (request_header))
	{
	  request_header *header;

	  /* Check if we have a complete request.  */
	  header = (request_header *)connection->read_base;
	  if (total_bytes >= header->size)
	    {
	      /* Process the request.  */
	      if (process_request (connection) < 0)
		return -1;

	      /* Adjust read pointer, and flush buffer.  */
	      connection->read_ptr -= header->size;
	      memmove (connection->read_base,
		       connection->read_base + header->size,
		       connection->read_ptr - connection->read_base);
	    }
	}

      return 0;
    }

  if (nbytes < 0)
    error (0, errno, _("cannot read from client"));

  return -1;
}


/* Write data to the client on CONNECTION.  */
int
write_data (client_connection *connection)
{
  ssize_t nbytes;

  assert (connection);
  assert ((connection->write_ptr - connection->write_base