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util.c revision 1.4 
      1 /*	$NetBSD: util.c,v 1.4 1997/07/20 20:47:33 christos 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 1.4 1997/07/20 20:47:33 christos 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 }
     91 
     92 int
     93 okname(cp0)
     94 	char *cp0;
     95 {
     96 	int c;
     97 	char *cp;
     98 
     99 	cp = cp0;
    100 	do {
    101 		c = *cp;
    102 		if (c & 0200)
    103 			goto bad;
    104 		if (!isalpha(c) && !isdigit(c) && c != '_' && c != '-')
    105 			goto bad;
    106 	} while (*++cp);
    107 	return (1);
    108 
    109 bad:	warnx("%s: invalid user name", cp0);
    110 	return (0);
    111 }
    112 
    113 int
    114 susystem(s)
    115 	char *s;
    116 {
    117 	sig_t istat, qstat;
    118 	int status;
    119 	pid_t pid;
    120 
    121 	pid = vfork();
    122 	switch (pid) {
    123 	case -1:
    124 		return (127);
    125 
    126 	case 0:
    127 		execl(_PATH_BSHELL, "sh", "-c", s, NULL);
    128 		_exit(127);
    129 	}
    130 	istat = signal(SIGINT, SIG_IGN);
    131 	qstat = signal(SIGQUIT, SIG_IGN);
    132 	if (waitpid(pid, &status, 0) < 0)
    133 		status = -1;
    134 	(void)signal(SIGINT, istat);
    135 	(void)signal(SIGQUIT, qstat);
    136 	return (status);
    137 }
    138 
    139 BUF *
    140 allocbuf(bp, fd, blksize)
    141 	BUF *bp;
    142 	int fd, blksize;
    143 {
    144 	struct stat stb;
    145 	size_t size;
    146 
    147 	if (fstat(fd, &stb) < 0) {
    148 		run_err("fstat: %s", strerror(errno));
    149 		return (0);
    150 	}
    151 	size = roundup(stb.st_blksize, blksize);
    152 	if (size == 0)
    153 		size = blksize;
    154 	if (bp->cnt >= size)
    155 		return (bp);
    156 	if ((bp->buf = realloc(bp->buf, size)) == NULL) {
    157 		bp->cnt = 0;
    158 		run_err("%s", strerror(errno));
    159 		return (0);
    160 	}
    161 	bp->cnt = size;
    162 	return (bp);
    163 }
    164 
    165 void
    166 lostconn(signo)
    167 	int signo;
    168 {
    169 	if (!iamremote)
    170 		warnx("lost connection");
    171 	exit(1);
    172 }
    173