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util.c revision 1.1.1.1 
      1 /*-
      2  * Copyright (c) 1992, 1993
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #ifndef lint
     35 static char sccsid[] = "@(#)util.c	8.2 (Berkeley) 4/2/94";
     36 #endif /* not lint */
     37 
     38 #include <sys/param.h>
     39 #include <sys/stat.h>
     40 #include <sys/wait.h>
     41 
     42 #include <ctype.h>
     43 #include <err.h>
     44 #include <errno.h>
     45 #include <paths.h>
     46 #include <signal.h>
     47 #include <stdio.h>
     48 #include <stdlib.h>
     49 #include <string.h>
     50 #include <unistd.h>
     51 
     52 #include "extern.h"
     53 
     54 char *
     55 colon(cp)
     56 	char *cp;
     57 {
     58 	if (*cp == ':')		/* Leading colon is part of file name. */
     59 		return (0);
     60 
     61 	for (; *cp; ++cp) {
     62 		if (*cp == ':')
     63 			return (cp);
     64 		if (*cp == '/')
     65 			return (0);
     66 	}
     67 	return (0);
     68 }
     69 
     70 void
     71 verifydir(cp)
     72 	char *cp;
     73 {
     74 	struct stat stb;
     75 
     76 	if (!stat(cp, &stb)) {
     77 		if (S_ISDIR(stb.st_mode))
     78 			return;
     79 		errno = ENOTDIR;
     80 	}
     81 	run_err("%s: %s", cp, strerror(errno));
     82 	exit(1);
     83 }
     84 
     85 int
     86 okname(cp0)
     87 	char *cp0;
     88 {
     89 	int c;
     90 	char *cp;
     91 
     92 	cp = cp0;
     93 	do {
     94 		c = *cp;
     95 		if (c & 0200)
     96 			goto bad;
     97 		if (!isalpha(c) && !isdigit(c) && c != '_' && c != '-')
     98 			goto bad;
     99 	} while (*++cp);
    100 	return (1);
    101 
    102 bad:	warnx("%s: invalid user name", cp0);
    103 	return (0);
    104 }
    105 
    106 int
    107 susystem(s, userid)
    108 	int userid;
    109 	char *s;
    110 {
    111 	sig_t istat, qstat;
    112 	int status, w;
    113 	pid_t pid;
    114 
    115 	pid = vfork();
    116 	switch (pid) {
    117 	case -1:
    118 		return (127);
    119 
    120 	case 0:
    121 		(void)setuid(userid);
    122 		execl(_PATH_BSHELL, "sh", "-c", s, NULL);
    123 		_exit(127);
    124 	}
    125 	istat = signal(SIGINT, SIG_IGN);
    126 	qstat = signal(SIGQUIT, SIG_IGN);
    127 	if (waitpid(pid, &status, 0) < 0)
    128 		status = -1;
    129 	(void)signal(SIGINT, istat);
    130 	(void)signal(SIGQUIT, qstat);
    131 	return (status);
    132 }
    133 
    134 BUF *
    135 allocbuf(bp, fd, blksize)
    136 	BUF *bp;
    137 	int fd, blksize;
    138 {
    139 	struct stat stb;
    140 	size_t size;
    141 
    142 	if (fstat(fd, &stb) < 0) {
    143 		run_err("fstat: %s", strerror(errno));
    144 		return (0);
    145 	}
    146 	size = roundup(stb.st_blksize, blksize);
    147 	if (size == 0)
    148 		size = blksize;
    149 	if (bp->cnt >= size)
    150 		return (bp);
    151 	if ((bp->buf = realloc(bp->buf, size)) == NULL) {
    152 		bp->cnt = 0;
    153 		run_err("%s", strerror(errno));
    154 		return (0);
    155 	}
    156 	bp->cnt = size;
    157 	return (bp);
    158 }
    159 
    160 void
    161 lostconn(signo)
    162 	int signo;
    163 {
    164 	if (!iamremote)
    165 		warnx("lost connection");
    166 	exit(1);
    167 }
    168