1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
28/*	  All Rights Reserved  	*/
29
30
31#pragma ident	"%Z%%M%	%I%	%E% SMI"
32/*
33 *	logs attempts by unknown remote machines to run uucico in FOREIGN
34 *	("/var/uucp/.Admin/Foreign").  if anything goes wrong,
35 *	sends mail to login MAILTO ("uucp").  the executable should be
36 *	placed in /usr/lib/uucp/remote.unknown, and should run setuid-uucp.
37 */
38
39#include	<stdio.h>
40#include	<sys/types.h>
41#include	<time.h>
42#include	<errno.h>
43#include	"uucp.h"
44
45#define	FOREIGN	"/var/uucp/.Admin/Foreign"
46#define	MAILTO	"uucp"
47#define	LOGLEN	256
48
49void fall_on_sword();
50
51int
52main(argc, argv)
53int	argc;
54char	*argv[];
55{
56	char		buf[LOGLEN], *ctoday, *logname, tmpbuf[MAXBASENAME+1];
57	FILE		*fp;
58	time_t		today;
59	extern char	*ctime();
60	extern FILE	*fopen();
61
62	if ( argc != 2 ) {
63		(void) fprintf(stderr, "USAGE: %s remotename\n", argv[0]);
64		exit(101);
65	}
66
67	if ( time(&today) != -1 ) {
68		ctoday = ctime(&today);
69		*(ctoday + strlen(ctoday) - 1) = '\0';	/* no ending \n */
70	} else
71		ctoday = "NO DATE";
72
73	logname = cuserid((char *) NULL);
74	(void) strncpy(tmpbuf, argv[1], MAXBASENAME);
75	tmpbuf[MAXBASENAME] = '\0';
76	(void) snprintf(buf, sizeof(buf), "%s: call from system %s login %s\n",
77		ctoday, tmpbuf, (logname == NULL ? "<unknown>" : logname));
78
79	errno = 0;
80	if ( (fp = fopen(FOREIGN, "a+")) == (FILE *)NULL )
81		fall_on_sword("cannot open", buf);
82	if ( fputs(buf, fp) == EOF )
83		fall_on_sword("cannot write", buf);
84	if ( fclose(fp) != 0 )
85		fall_on_sword("cannot close", buf);
86
87	return (0);
88}
89
90/* don't return from here */
91void
92fall_on_sword(errmsg, logmsg)
93char	*errmsg, *logmsg;
94{
95	char		ebuf[BUFSIZ+1];
96	int		fds[2];
97	size_t		sz;
98
99	(void) snprintf(ebuf, BUFSIZ,
100		"To: %s\nSubject: %s %s\n\n%s %s:\t%s (%d)\nlog msg:\t%s",
101		MAILTO, errmsg, FOREIGN, errmsg, FOREIGN,
102		strerror(errno), errno, logmsg);
103	sz = strlen(ebuf);
104	if (ebuf[sz-1] != '\n') {
105		ebuf[sz] = '\n';
106		ebuf[sz+1] = '\0';
107	}
108
109	/* reset to real uid. get a pipe. put error message on	*/
110	/* "write end" of pipe, close it. dup "read end" to	*/
111	/* stdin and then execl mail (which will read the error	*/
112	/* message we just wrote).				*/
113
114	if ( setuid(getuid()) == -1 || pipe(fds) != 0
115	|| write(fds[1], ebuf, strlen(ebuf)) != strlen(ebuf)
116	|| close(fds[1]) != 0 )
117		exit(errno);
118
119	if ( fds[0] != 0 ) {
120		close(0);
121		if ( dup(fds[0]) != 0 )
122			exit(errno);
123	}
124
125	execl("/usr/bin/mail", "mail", MAILTO, (char *) 0);
126	exit(errno);	/* shouldn't get here */
127}
128