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      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