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util.c revision 1.5 
      1 /*	$NetBSD: util.c,v 1.5 1998/07/28 05:31:27 mycroft 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 #include <sys/cdefs.h>
     37 #ifndef lint
     38 #if 0
     39 static char sccsid[] = "@(#)util.c	8.2 (Berkeley) 4/2/94";
     40 #else
     41 __RCSID("$NetBSD: util.c,v 1.5 1998/07/28 05:31:27 mycroft Exp $");
     42 #endif
     43 #endif /* not lint */
     44 
     45 #include <sys/param.h>
     46 #include <sys/stat.h>
     47 #include <sys/wait.h>
     48 
     49 #include <ctype.h>
     50 #include <err.h>
     51 #include <errno.h>
     52 #include <paths.h>
     53 #include <signal.h>
     54 #include <stdio.h>
     55 #include <stdlib.h>
     56 #include <string.h>
     57 #include <unistd.h>
     58 
     59 #include "extern.h"
     60 
     61 char *
     62 colon(cp)
     63 	char *cp;
     64 {
     65 	if (*cp == ':')		/* Leading colon is part of file name. */
     66 		return (0);
     67 
     68 	for (; *cp; ++cp) {
     69 		if (*cp == ':')
     70 			return (cp);
     71 		if (*cp == '/')
     72 			return (0);
     73 	}
     74 	return (0);
     75 }
     76 
     77 void
     78 verifydir(cp)
     79 	char *cp;
     80 {
     81 	struct stat stb;
     82 
     83 	if (!stat(cp, &stb)) {
     84 		if (S_ISDIR(stb.st_mode))
     85 			return;
     86 		errno = ENOTDIR;
     87 	}
     88 	run_err("%s: %s", cp, strerror(errno));
     89 	exit(1);
     90 	/* NOTREACHED */
     91 }
     92 
     93 int
     94 okname(cp0)
     95 	char *cp0;
     96 {
     97 	int c;
     98 	char *cp;
     99 
    100 	cp = cp0;
    101 	do {
    102 		c = *cp;
    103 		if (c & 0200)
    104 			goto bad;
    105 		if (!isalpha(c) && !isdigit(c) && c != '_' && c != '-')
    106 			goto bad;
    107 	} while (*++cp);
    108 	return (1);
    109 
    110 bad:	warnx("%s: invalid user name", cp0);
    111 	return (0);
    112 }
    113 
    114 int
    115 susystem(s)
    116 	char *s;
    117 {
    118 	sig_t istat, qstat;
    119 	int status;
    120 	pid_t pid;
    121 
    122 	pid = vfork();
    123 	switch (pid) {
    124 	case -1:
    125 		return (127);
    126 
    127 	case 0:
    128 		execl(_PATH_BSHELL, "sh", "-c", s, NULL);
    129 		_exit(127);
    130 		/* NOTREACHED */
    131 	}
    132 	istat = signal(SIGINT, SIG_IGN);
    133 	qstat = signal(SIGQUIT, SIG_IGN);
    134 	if (waitpid(pid, &status, 0) < 0)
    135 		status = -1;
    136 	(void)signal(SIGINT, istat);
    137 	(void)signal(SIGQUIT, qstat);
    138 	return (status);
    139 }
    140 
    141 BUF *
    142 allocbuf(bp, fd, blksize)
    143 	BUF *bp;
    144 	int fd, blksize;
    145 {
    146 	struct stat stb;
    147 	size_t size;
    148 
    149 	if (fstat(fd, &stb) < 0) {
    150 		run_err("fstat: %s", strerror(errno));
    151 		return (0);
    152 	}
    153 	size = roundup(stb.st_blksize, blksize);
    154 	if (size == 0)
    155 		size = blksize;
    156 	if (bp->cnt >= size)
    157 		return (bp);
    158 	if ((bp->buf = realloc(bp->buf, size)) == NULL) {
    159 		bp->cnt = 0;
    160 		run_err("%s", strerror(errno));
    161 		return (0);
    162 	}
    163 	bp->cnt = size;
    164 	return (bp);
    165 }
    166 
    167 void
    168 lostconn(signo)
    169 	int signo;
    170 {
    171 	if (!iamremote)
    172 		warnx("lost connection");
    173 	exit(1);
    174 	/* NOTREACHED */
    175 }
    176