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util.c revision 1.2 
      1 /*	$NetBSD: util.c,v 1.2 1995/03/21 08:19:08 cgd Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1992, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #ifndef lint
     37 #if 0
     38 static char sccsid[] = "@(#)util.c	8.2 (Berkeley) 4/2/94";
     39 #else
     40 static char rcsid[] = "$NetBSD: util.c,v 1.2 1995/03/21 08:19:08 cgd Exp $";
     41 #endif
     42 #endif /* not lint */
     43 
     44 #include <sys/param.h>
     45 #include <sys/stat.h>
     46 #include <sys/wait.h>
     47 
     48 #include <ctype.h>
     49 #include <err.h>
     50 #include <errno.h>
     51 #include <paths.h>
     52 #include <signal.h>
     53 #include <stdio.h>
     54 #include <stdlib.h>
     55 #include <string.h>
     56 #include <unistd.h>
     57 
     58 #include "extern.h"
     59 
     60 char *
     61 colon(cp)
     62 	char *cp;
     63 {
     64 	if (*cp == ':')		/* Leading colon is part of file name. */
     65 		return (0);
     66 
     67 	for (; *cp; ++cp) {
     68 		if (*cp == ':')
     69 			return (cp);
     70 		if (*cp == '/')
     71 			return (0);
     72 	}
     73 	return (0);
     74 }
     75 
     76 void
     77 verifydir(cp)
     78 	char *cp;
     79 {
     80 	struct stat stb;
     81 
     82 	if (!stat(cp, &stb)) {
     83 		if (S_ISDIR(stb.st_mode))
     84 			return;
     85 		errno = ENOTDIR;
     86 	}
     87 	run_err("%s: %s", cp, strerror(errno));
     88 	exit(1);
     89 }
     90 
     91 int
     92 okname(cp0)
     93 	char *cp0;
     94 {
     95 	int c;
     96 	char *cp;
     97 
     98 	cp = cp0;
     99 	do {
    100 		c = *cp;
    101 		if (c & 0200)
    102 			goto bad;
    103 		if (!isalpha(c) && !isdigit(c) && c != '_' && c != '-')
    104 			goto bad;
    105 	} while (*++cp);
    106 	return (1);
    107 
    108 bad:	warnx("%s: invalid user name", cp0);
    109 	return (0);
    110 }
    111 
    112 int
    113 susystem(s, userid)
    114 	int userid;
    115 	char *s;
    116 {
    117 	sig_t istat, qstat;
    118 	int status, w;
    119 	pid_t pid;
    120 
    121 	pid = vfork();
    122 	switch (pid) {
    123 	case -1:
    124 		return (127);
    125 
    126 	case 0:
    127 		(void)setuid(userid);
    128 		execl(_PATH_BSHELL, "sh", "-c", s, NULL);
    129 		_exit(127);
    130 	}
    131 	istat = signal(SIGINT, SIG_IGN);
    132 	qstat = signal(SIGQUIT, SIG_IGN);
    133 	if (waitpid(pid, &status, 0) < 0)
    134 		status = -1;
    135 	(void)signal(SIGINT, istat);
    136 	(void)signal(SIGQUIT, qstat);
    137 	return (status);
    138 }
    139 
    140 BUF *
    141 allocbuf(bp, fd, blksize)
    142 	BUF *bp;
    143 	int fd, blksize;
    144 {
    145 	struct stat stb;
    146 	size_t size;
    147 
    148 	if (fstat(fd, &stb) < 0) {
    149 		run_err("fstat: %s", strerror(errno));
    150 		return (0);
    151 	}
    152 	size = roundup(stb.st_blksize, blksize);
    153 	if (size == 0)
    154 		size = blksize;
    155 	if (bp->cnt >= size)
    156 		return (bp);
    157 	if ((bp->buf = realloc(bp->buf, size)) == NULL) {
    158 		bp->cnt = 0;
    159 		run_err("%s", strerror(errno));
    160 		return (0);
    161 	}
    162 	bp->cnt = size;
    163 	return (bp);
    164 }
    165 
    166 void
    167 lostconn(signo)
    168 	int signo;
    169 {
    170 	if (!iamremote)
    171 		warnx("lost connection");
    172 	exit(1);
    173 }
    174