/*- * Copyright (c) 1992, 1993 *	The Regents of the University of California.  All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright *    notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright *    notice, this list of conditions and the following disclaimer in the *    documentation and/or other materials provided with the distribution. * 4. Neither the name of the University nor the names of its contributors *    may be used to endorse or promote products derived from this software *    without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */#ifndef lintstatic char sccsid[] = "@(#)util.c	8.2 (Berkeley) 4/2/94";#endif /* not lint */#ifdef HAVE_CONFIG_H#include <config.h>#endif#include <sys/param.h>#ifdef HAVE_SYS_SYSMACROS_H#include <sys/sysmacros.h>#endif#include <sys/stat.h>#ifdef HAVE_SYS_WAIT_H#include <sys/wait.h>#endif#include <ctype.h>#include <err.h>#include <errno.h>#include <signal.h>#include <stdio.h>#include <stdlib.h>#include <string.h>#include <unistd.h>#include "extern.h"char *colon(char *cp){	if (*cp == ':')		/* Leading colon is part of file name. */		return (0);	for (; *cp; ++cp) {		if (*cp == ':')			return (cp);		if (*cp == '/')			return (0);	}	return (0);}voidverifydir(char *cp){	struct stat stb;	if (!stat(cp, &stb)) {		if (S_ISDIR(stb.st_mode))			return;		errno = ENOTDIR;	}	run_err("%s: %s", cp, strerror(errno));	exit(1);}intokname(char *cp0){	int c;	char *cp;	cp = cp0;	do {		c = *cp;		if (c & 0200)			goto bad;		if (!isalpha(c) && !isdigit(c) && c != '_' && c != '-')			goto bad;	} while (*++cp);	return (1);bad:		error (0, 0, "%s: invalid user name", cp0);	return (0);}intsusystem(char *s, int userid){	sig_t istat, qstat;	int status, w;	pid_t pid;	pid = vfork();	switch (pid) {	case -1:		return (127);	case 0:		(void)setuid(userid);		execl(PATH_BSHELL, "sh", "-c", s, NULL);		_exit(127);	}	istat = signal(SIGINT, SIG_IGN);	qstat = signal(SIGQUIT, SIG_IGN);	if (waitpid(pid, &status, 0) < 0)		status = -1;	(void)signal(SIGINT, istat);	(void)signal(SIGQUIT, qstat);	return (status);}BUF *allocbuf(BUF *bp, int fd, int blksize){	struct stat stb;	size_t size;	if (fstat(fd, &stb) < 0) {		run_err("fstat: %s", strerror(errno));		return (0);	}#ifndef roundup#  define roundup(x, y)   ((((x)+((y)-1))/(y))*(y))#endif	size = roundup(BUFSIZ, blksize);	if (size == 0)		size = blksize;	if (bp->cnt >= size)		return (bp);	if ((bp->buf = realloc(bp->buf, size)) == NULL) {		bp->cnt = 0;		run_err("%s", strerror(errno));		return (0);	}	bp->cnt = size;	return (bp);}RETSIGTYPElostconn(int signo){	if (!iamremote)		error (0, 0, "lost connection");	exit(1);}