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651 lines
16 KiB
C
651 lines
16 KiB
C
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/* Copyright (C) 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Mark Kettenis <kettenis@phys.uva.nl>, 1997.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <assert.h>
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include <utmp.h>
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#include "utmpd.h"
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#include "utmpd-private.h"
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/* Prototypes for the local functions. */
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static int process_request (client_connection *connection);
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static int send_reply (client_connection *connect, const reply_header *reply);
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static int do_setutent (client_connection *connection);
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static int do_getutent (client_connection *connection);
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static int do_endutent (client_connection *connection);
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static int do_getutline (client_connection *connection);
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static int do_getutid (client_connection *connection);
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static int do_pututline (client_connection *connection);
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static int do_updwtmp (client_connection *connection);
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static int proc_utmp_eq (const struct utmp *entry, const struct utmp *match);
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static int internal_getut_r (client_connection *connection,
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const struct utmp *id, struct utmp *buffer);
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/* Read data from the client on CONNECTION. */
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int
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read_data (client_connection *connection)
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{
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ssize_t nbytes;
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assert (connection);
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assert ((connection->read_end - connection->read_ptr) > 0);
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/* Read data. */
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nbytes = read (connection->sock, connection->read_ptr,
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connection->read_end - connection->read_ptr);
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if (nbytes > 0)
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{
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size_t total_bytes;
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/* Update read pointer. */
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connection->read_ptr += nbytes;
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/* Check if we have a complete request header. */
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total_bytes = connection->read_ptr - connection->read_base;
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if (total_bytes >= sizeof (request_header))
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{
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request_header *header;
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/* Check if we have a complete request. */
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header = (request_header *)connection->read_base;
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if (total_bytes >= header->size)
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{
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/* Process the request. */
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if (process_request (connection) < 0)
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return -1;
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/* Adjust read pointer, and flush buffer. */
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connection->read_ptr -= header->size;
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memmove (connection->read_base,
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connection->read_base + header->size,
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connection->read_ptr - connection->read_base);
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}
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}
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return 0;
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}
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if (nbytes < 0)
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error (0, errno, "cannot read from client");
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return -1;
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}
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/* Write data to the client on CONNECTION. */
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int
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write_data (client_connection *connection)
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{
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ssize_t nbytes;
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assert (connection);
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assert ((connection->write_ptr - connection->write_base) > 0);
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/* Write data. */
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nbytes = write (connection->sock, connection->write_base,
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connection->write_ptr - connection->write_base);
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if (nbytes > 0)
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{
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/* Adjust write pointer and flush buffer. */
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connection->write_ptr -= nbytes;
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memmove (connection->write_base, connection->write_base + nbytes,
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connection->write_ptr - connection->write_base);
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return 0;
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}
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if (nbytes < 0)
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error (0, errno, "cannot write to client");
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return -1;
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}
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/* Process the request received on CONNECTION. Returns 0 if
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successful, -1 if not. */
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static int
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process_request (client_connection *connection)
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{
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request_header *header;
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assert (connection);
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assert (connection->read_base);
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header = (request_header *)connection->read_base;
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if (header->version != UTMPD_VERSION)
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{
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warning (EINVAL, "invalid protocol version");
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return -1;
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}
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switch (header->type)
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{
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case UTMPD_REQ_SETUTENT: return do_setutent (connection);
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case UTMPD_REQ_GETUTENT: return do_getutent (connection);
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case UTMPD_REQ_ENDUTENT: return do_endutent (connection);
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case UTMPD_REQ_GETUTLINE: return do_getutline (connection);
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case UTMPD_REQ_GETUTID: return do_getutid (connection);
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case UTMPD_REQ_PUTUTLINE: return do_pututline (connection);
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case UTMPD_REQ_UPDWTMP: return do_updwtmp (connection);
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default:
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warning (EINVAL, "invalid request type");
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return -1;
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}
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}
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/* Send the reply specified by HEADER to the client on CONNECTION.
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Returns 0 if successful, -1 if not. */
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static int
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send_reply (client_connection *connection, const reply_header *reply)
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{
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/* Check if the reply fits in the buffer. */
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if ((size_t) (connection->write_end - connection->write_ptr) < reply->size)
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{
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error (0, 0, "buffer overflow");
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return -1;
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}
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/* Copy reply to buffer, and adjust write pointer. */
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memcpy (connection->write_ptr, reply, reply->size);
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connection->write_ptr += reply->size;
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return 0;
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}
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static int
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do_setutent (client_connection *connection)
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{
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setutent_request *request;
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setutent_reply reply;
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request = (setutent_request *)connection->read_base;
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if (request->header.size != sizeof (setutent_request))
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{
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warning (EINVAL, "invalid request size");
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return -1;
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}
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/* Initialize reply. */
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reply.header.version = UTMPD_VERSION;
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reply.header.size = sizeof (setutent_reply);
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reply.header.type = UTMPD_REQ_SETUTENT;
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/* Select database. */
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if (!strncmp (request->file, _PATH_UTMP, sizeof request->file))
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connection->database = utmp_db;
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else
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{
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errno = EINVAL;
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goto return_error;
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}
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/* Initialize position pointer. */
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connection->position = 0;
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#if _HAVE_UT_TYPE - 0
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/* Make sure the entry won't match. */
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connection->last_entry.ut_type = -1;
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#endif
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reply.errnum = 0;
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reply.result = 0;
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return send_reply (connection, &reply.header);
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return_error:
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reply.errnum = errno;
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reply.result = -1;
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return send_reply (connection, &reply.header);
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}
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static int
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do_getutent (client_connection *connection)
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{
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getutent_request *request;
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getutent_reply reply;
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request = (getutent_request *)connection->read_base;
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if (request->header.size != sizeof (getutent_request))
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{
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warning (EINVAL, "invalid request size");
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return -1;
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}
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/* Initialize reply. */
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reply.header.version = UTMPD_VERSION;
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reply.header.size = sizeof (getutent_reply);
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reply.header.type = UTMPD_REQ_GETUTENT;
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if (connection->database == NULL || connection->position == -1)
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{
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errno = ESRCH;
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goto return_error;
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}
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/* Make sure we're in synch with the ordinary file. */
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if (synchronize_database (connection->database) < 0)
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{
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errno = ESRCH;
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goto return_error;
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}
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/* Read the next entry from the database. */
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if (read_entry (connection->database, connection->position,
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&connection->last_entry) < 0)
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{
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connection->position = -1;
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errno = ESRCH;
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goto return_error;
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}
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/* Update position pointer. */
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connection->position++;
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memcpy (&reply.entry, &connection->last_entry, sizeof (struct utmp));
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reply.errnum = 0;
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reply.result = 0;
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return send_reply (connection, (reply_header *)&reply);
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return_error:
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memset (&reply.entry, 0, sizeof (struct utmp));
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reply.errnum = errno;
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reply.result = -1;
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return send_reply (connection, &reply.header);
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}
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static int
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do_endutent (client_connection *connection)
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{
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endutent_request *request;
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endutent_reply reply;
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request = (endutent_request *)connection->read_base;
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if (request->header.size != sizeof (endutent_request))
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{
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warning (EINVAL, "invalid request size");
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return -1;
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}
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/* Deselect database. */
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connection->database = NULL;
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/* Formulate reply. */
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reply.header.version = UTMPD_VERSION;
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reply.header.size = sizeof (endutent_reply);
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reply.header.type = UTMPD_REQ_ENDUTENT;
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reply.errnum = 0;
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reply.result = 0;
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return send_reply (connection, &reply.header);
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}
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static int
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do_getutline (client_connection *connection)
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{
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getutline_request *request;
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getutline_reply reply;
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request = (getutline_request *)connection->read_base;
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if (request->header.size != sizeof (getutline_request))
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{
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warning (EINVAL, "invalid request size");
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return -1;
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}
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/* Initialize reply. */
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reply.header.version = UTMPD_VERSION;
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reply.header.size = sizeof (getutline_reply);
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reply.header.type = UTMPD_REQ_GETUTLINE;
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if (connection->database == NULL || connection->position == -1)
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{
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errno = ESRCH;
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goto return_error;
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}
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/* Make sure we're in synch with the ordinary file. */
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if (synchronize_database (connection->database) < 0)
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{
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errno = ESRCH;
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goto return_error;
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}
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while (1)
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{
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/* Read the next entry. */
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if (read_entry (connection->database, connection->position,
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&connection->last_entry) < 0)
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{
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connection->position = -1;
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errno = ESRCH;
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goto return_error;
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}
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connection->position++;
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/* Stop if we found a user or login entry. */
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if (
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#if _HAVE_UT_TYPE - 0
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(connection->last_entry.ut_type == USER_PROCESS
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|| connection->last_entry.ut_type == LOGIN_PROCESS)
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&&
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#endif
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!strncmp (request->line.ut_line, connection->last_entry.ut_line,
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sizeof request->line.ut_line))
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break;
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}
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memcpy (&reply.entry, &connection->last_entry, sizeof (struct utmp));
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reply.errnum = 0;
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reply.result = 0;
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return send_reply (connection, &reply.header);
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return_error:
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memset (&reply.entry, 0, sizeof (struct utmp));
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reply.errnum = errno;
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reply.result = -1;
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return send_reply (connection, &reply.header);
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}
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static int
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do_getutid (client_connection *connection)
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{
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getutid_request *request;
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getutid_reply reply;
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request = (getutid_request *)connection->read_base;
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if (request->header.size != sizeof (getutid_request))
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{
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warning (EINVAL, "invalid request size");
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return -1;
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}
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/* Initialize reply. */
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reply.header.version = UTMPD_VERSION;
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reply.header.size = sizeof (getutid_reply);
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reply.header.type = UTMPD_REQ_GETUTID;
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if (connection->database == NULL || connection->position == -1)
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{
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errno = ESRCH;
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goto return_error;
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}
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/* Make sure we're in synch with the ordinary file. */
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if (synchronize_database (connection->database) < 0)
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{
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errno = ESRCH;
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goto return_error;
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}
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if (internal_getut_r (connection, &request->id,
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&connection->last_entry) < 0)
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{
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errno = ESRCH;
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goto return_error;
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}
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reply.errnum = 0;
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reply.result = 0;
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memcpy (&reply.entry, &connection->last_entry, sizeof (struct utmp));
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return send_reply (connection, &reply.header);
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return_error:
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memset (&reply.entry, 0, sizeof (struct utmp));
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reply.errnum = errno;
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reply.result = -1;
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return send_reply (connection, &reply.header);
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}
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static int
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do_pututline (client_connection *connection)
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{
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pututline_request *request;
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pututline_reply reply;
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struct utmp buffer;
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int found;
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request = (pututline_request *)connection->read_base;
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if (request->header.size != sizeof (pututline_request))
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{
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warning (EINVAL, "invalid request size");
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return -1;
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}
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/* Initialize reply. */
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reply.header.version = UTMPD_VERSION;
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reply.header.size = sizeof (pututline_reply);
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reply.header.type = UTMPD_REQ_PUTUTLINE;
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if (!(connection->access & W_OK))
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{
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errno = EPERM;
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goto return_error;
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}
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if (connection->database == NULL || connection->position == -1)
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{
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errno = ESRCH;
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goto return_error;
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}
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/* Make sure we're in synch with the ordinary file. */
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if (synchronize_database (connection->database) < 0)
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{
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errno = ESRCH;
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goto return_error;
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}
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/* Find the correct place to insert the data. */
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if (connection->position > 0
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&& (
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#if _HAVE_UT_TYPE - 0
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(connection->last_entry.ut_type == request->utmp.ut_type
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||
|
&& (connection->last_entry.ut_type == RUN_LVL
|
||
|
|| connection->last_entry.ut_type == BOOT_TIME
|
||
|
|| connection->last_entry.ut_type == OLD_TIME
|
||
|
|| connection->last_entry.ut_type == NEW_TIME))
|
||
|
||
|
||
|
#endif
|
||
|
proc_utmp_eq (&connection->last_entry, &request->utmp)))
|
||
|
found = 1;
|
||
|
else
|
||
|
found = internal_getut_r (connection, &request->utmp, &buffer);
|
||
|
|
||
|
if (found < 0)
|
||
|
{
|
||
|
/* We append the next entry. */
|
||
|
connection->position =
|
||
|
append_entry (connection->database, &request->utmp);
|
||
|
if (connection->position < 0)
|
||
|
goto return_error;
|
||
|
}
|
||
|
else
|
||
|
{
|
||
|
/* We replace the just read entry. */
|
||
|
connection->position--;
|
||
|
if (write_entry (connection->database, connection->position,
|
||
|
&request->utmp) < 0)
|
||
|
goto return_error;
|
||
|
}
|
||
|
|
||
|
/* Write the entry to the compatibility file. */
|
||
|
write_old_entry (connection->database, connection->position, &request->utmp);
|
||
|
|
||
|
/* Update position pointer. */
|
||
|
connection->position++;
|
||
|
|
||
|
reply.errnum = 0;
|
||
|
reply.result = 0;
|
||
|
return send_reply (connection, &reply.header);
|
||
|
|
||
|
return_error:
|
||
|
reply.errnum = errno;
|
||
|
reply.result = -1;
|
||
|
return send_reply (connection, &reply.header);
|
||
|
}
|
||
|
|
||
|
|
||
|
static int
|
||
|
do_updwtmp (client_connection *connection)
|
||
|
{
|
||
|
updwtmp_request *request;
|
||
|
updwtmp_reply reply;
|
||
|
utmp_database *database;
|
||
|
|
||
|
request = (updwtmp_request *)connection->read_base;
|
||
|
if (request->header.size != sizeof (updwtmp_request))
|
||
|
{
|
||
|
warning (EINVAL, "invalid request size");
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
/* Initialize reply. */
|
||
|
reply.header.version = UTMPD_VERSION;
|
||
|
reply.header.size = sizeof (updwtmp_reply);
|
||
|
reply.header.type = UTMPD_REQ_UPDWTMP;
|
||
|
|
||
|
if (!(connection->access & W_OK))
|
||
|
{
|
||
|
errno = EPERM;
|
||
|
goto return_error;
|
||
|
}
|
||
|
|
||
|
/* Select database. */
|
||
|
if (!strncmp (request->file, _PATH_UTMP, sizeof request->file))
|
||
|
database = utmp_db;
|
||
|
else
|
||
|
{
|
||
|
errno = EINVAL;
|
||
|
goto return_error;
|
||
|
}
|
||
|
|
||
|
/* Make sure we're in synch with the ordinary file. */
|
||
|
if (synchronize_database (database) < 0)
|
||
|
{
|
||
|
errno = ESRCH;
|
||
|
goto return_error;
|
||
|
}
|
||
|
|
||
|
/* Append the entry. */
|
||
|
if (append_entry (database, &request->utmp) < 0)
|
||
|
goto return_error;
|
||
|
|
||
|
reply.errnum = 0;
|
||
|
reply.result = 0;
|
||
|
return send_reply (connection, &reply.header);
|
||
|
|
||
|
return_error:
|
||
|
reply.errnum = errno;
|
||
|
reply.result = -1;
|
||
|
return send_reply (connection, &reply.header);
|
||
|
}
|
||
|
|
||
|
|
||
|
/* This function is identical to the one in login/utmp_file.c. */
|
||
|
static int
|
||
|
proc_utmp_eq (const struct utmp *entry, const struct utmp *match)
|
||
|
{
|
||
|
return
|
||
|
(
|
||
|
#if _HAVE_UT_TYPE - 0
|
||
|
(entry->ut_type == INIT_PROCESS
|
||
|
|| entry->ut_type == LOGIN_PROCESS
|
||
|
|| entry->ut_type == USER_PROCESS
|
||
|
|| entry->ut_type == DEAD_PROCESS)
|
||
|
&&
|
||
|
(match->ut_type == INIT_PROCESS
|
||
|
|| match->ut_type == LOGIN_PROCESS
|
||
|
|| match->ut_type == USER_PROCESS
|
||
|
|| match->ut_type == DEAD_PROCESS)
|
||
|
&&
|
||
|
#endif
|
||
|
#if _HAVE_UT_ID - 0
|
||
|
strncmp (entry->ut_id, match->ut_id, sizeof match->ut_id) == 0
|
||
|
#else
|
||
|
strncmp (entry->ut_line, match->ut_line, sizeof match->ut_line) == 0
|
||
|
#endif
|
||
|
);
|
||
|
}
|
||
|
|
||
|
|
||
|
/* This function is derived from the one in login/utmp_file.c. */
|
||
|
static int
|
||
|
internal_getut_r (client_connection *connection,
|
||
|
const struct utmp *id, struct utmp *buffer)
|
||
|
{
|
||
|
#if _HAVE_UT_TYPE - 0
|
||
|
if (id->ut_type == RUN_LVL || id->ut_type == BOOT_TIME
|
||
|
|| id->ut_type == OLD_TIME || id->ut_type == NEW_TIME)
|
||
|
{
|
||
|
/* Search for next entry with type RUN_LVL, BOOT_TIME,
|
||
|
OLD_TIME, or NEW_TIME. */
|
||
|
|
||
|
while (1)
|
||
|
{
|
||
|
/* Read the next entry. */
|
||
|
if (read_entry (connection->database, connection->position,
|
||
|
buffer) < 0)
|
||
|
{
|
||
|
connection->position = -1;
|
||
|
return -1;
|
||
|
}
|
||
|
connection->position++;
|
||
|
|
||
|
if (id->ut_type == buffer->ut_type)
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
else
|
||
|
#endif /* _HAVE_UT_TYPE */
|
||
|
{
|
||
|
/* Search for the next entry with the specified ID and with type
|
||
|
INIT_PROCESS, LOGIN_PROCESS, USER_PROCESS, or DEAD_PROCESS. */
|
||
|
|
||
|
while (1)
|
||
|
{
|
||
|
/* Read the next entry. */
|
||
|
if (read_entry (connection->database, connection->position,
|
||
|
buffer) < 0)
|
||
|
{
|
||
|
connection->position = -1;
|
||
|
return -1;
|
||
|
}
|
||
|
connection->position++;
|
||
|
|
||
|
if (proc_utmp_eq (buffer, id))
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|