xref: /titanic_50/usr/src/cmd/bnu/unknown.c (revision dfb96a4f56fb431b915bc67e5d9d5c8d4f4f6679)
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  
49  void fall_on_sword();
50  
51  int
52  main(argc, argv)
53  int	argc;
54  char	*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 */
91  void
92  fall_on_sword(errmsg, logmsg)
93  char	*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