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util.c revision 1.6 
      1 /*	$NetBSD: util.c,v 1.6 2003/08/07 09:05:27 agc 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. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 #if 0
     35 static char sccsid[] = "@(#)util.c	8.2 (Berkeley) 4/2/94";
     36 #else
     37 __RCSID("$NetBSD: util.c,v 1.6 2003/08/07 09:05:27 agc Exp $");
     38 #endif
     39 #endif /* not lint */
     40 
     41 #include <sys/param.h>
     42 #include <sys/stat.h>
     43 #include <sys/wait.h>
     44 
     45 #include <ctype.h>
     46 #include <err.h>
     47 #include <errno.h>
     48 #include <paths.h>
     49 #include <signal.h>
     50 #include <stdio.h>
     51 #include <stdlib.h>
     52 #include <string.h>
     53 #include <unistd.h>
     54 
     55 #include "extern.h"
     56 
     57 char *
     58 colon(cp)
     59 	char *cp;
     60 {
     61 	if (*cp == ':')		/* Leading colon is part of file name. */
     62 		return (0);
     63 
     64 	for (; *cp; ++cp) {
     65 		if (*cp == ':')
     66 			return (cp);
     67 		if (*cp == '/')
     68 			return (0);
     69 	}
     70 	return (0);
     71 }
     72 
     73 void
     74 verifydir(cp)
     75 	char *cp;
     76 {
     77 	struct stat stb;
     78 
     79 	if (!stat(cp, &stb)) {
     80 		if (S_ISDIR(stb.st_mode))
     81 			return;
     82 		errno = ENOTDIR;
     83 	}
     84 	run_err("%s: %s", cp, strerror(errno));
     85 	exit(1);
     86 	/* NOTREACHED */
     87 }
     88 
     89 int
     90 okname(cp0)
     91 	char *cp0;
     92 {
     93 	int c;
     94 	char *cp;
     95 
     96 	cp = cp0;
     97 	do {
     98 		c = *cp;
     99 		if (c & 0200)
    100 			goto bad;
    101 		if (!isalpha(c) && !isdigit(c) && c != '_' && c != '-')
    102 			goto bad;
    103 	} while (*++cp);
    104 	return (1);
    105 
    106 bad:	warnx("%s: invalid user name", cp0);
    107 	return (0);
    108 }
    109 
    110 int
    111 susystem(s)
    112 	char *s;
    113 {
    114 	sig_t istat, qstat;
    115 	int status;
    116 	pid_t pid;
    117 
    118 	pid = vfork();
    119 	switch (pid) {
    120 	case -1:
    121 		return (127);
    122 
    123 	case 0:
    124 		execl(_PATH_BSHELL, "sh", "-c", s, NULL);
    125 		_exit(127);
    126 		/* NOTREACHED */
    127 	}
    128 	istat = signal(SIGINT, SIG_IGN);
    129 	qstat = signal(SIGQUIT, SIG_IGN);
    130 	if (waitpid(pid, &status, 0) < 0)
    131 		status = -1;
    132 	(void)signal(SIGINT, istat);
    133 	(void)signal(SIGQUIT, qstat);
    134 	return (status);
    135 }
    136 
    137 BUF *
    138 allocbuf(bp, fd, blksize)
    139 	BUF *bp;
    140 	int fd, blksize;
    141 {
    142 	struct stat stb;
    143 	size_t size;
    144 
    145 	if (fstat(fd, &stb) < 0) {
    146 		run_err("fstat: %s", strerror(errno));
    147 		return (0);
    148 	}
    149 	size = roundup(stb.st_blksize, blksize);
    150 	if (size == 0)
    151 		size = blksize;
    152 	if (bp->cnt >= size)
    153 		return (bp);
    154 	if ((bp->buf = realloc(bp->buf, size)) == NULL) {
    155 		bp->cnt = 0;
    156 		run_err("%s", strerror(errno));
    157 		return (0);
    158 	}
    159 	bp->cnt = size;
    160 	return (bp);
    161 }
    162 
    163 void
    164 lostconn(signo)
    165 	int signo;
    166 {
    167 	if (!iamremote)
    168 		warnx("lost connection");
    169 	exit(1);
    170 	/* NOTREACHED */
    171 }
    172