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avoid using warnx() in a signal handler, suggestion from aaron

/*	$OpenBSD: util.c,v 1.8 2001/01/15 19:54:56 deraadt Exp $	*/
/*	$NetBSD: util.c,v 1.2 1995/03/21 08:19:08 cgd Exp $	*/

/*-
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 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 lint
#if 0
static char sccsid[] = "@(#)util.c	8.2 (Berkeley) 4/2/94";
#else
static char rcsid[] = "$OpenBSD: util.c,v 1.8 2001/01/15 19:54:56 deraadt Exp $";
#endif
#endif /* not lint */

#include <sys/param.h>
#include <sys/stat.h>
#include <sys/wait.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <paths.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "extern.h"

char *
colon(cp)
	char *cp;
{
	for (; *cp; ++cp) {
		if (*cp == ':')
			return (cp);
		if (*cp == '/')
			return (0);
	}
	return (0);
}

void
verifydir(cp)
	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);
}

int
okname(cp0)
	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:	warnx("%s: invalid user name", cp0);
	return (0);
}

int
susystem(s, userid)
	int userid;
	char *s;
{
	sig_t istat, qstat;
	int status;
	pid_t pid;

	pid = vfork();
	switch (pid) {
	case -1:
		return (127);

	case 0:
		(void)seteuid(userid);
		(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(bp, fd, blksize)
	BUF *bp;
	int fd, blksize;
{
	struct stat stb;
	size_t size;
	char *p;

	if (fstat(fd, &stb) < 0) {
		run_err("fstat: %s", strerror(errno));
		return (0);
	}
	size = roundup(stb.st_blksize, blksize);
	if (size == 0)
		size = blksize;
	if (bp->cnt >= size)
		return (bp);
	if ((p = realloc(bp->buf, size)) == NULL) {
		if (bp->buf)
			free(bp->buf);
		bp->buf = NULL;
		bp->cnt = 0;
		run_err("%s", strerror(errno));
		return (0);
	}
	bp->buf = p;
	bp->cnt = size;
	return (bp);
}

void
lostconn(signo)
	int signo;
{
	extern char *__progname;
	char buf[1024];

	if (!iamremote) {
		strlcpy(buf, __progname, sizeof buf);
		strlcat(buf, ": lost connection\n", sizeof buf);
		write(STDERR_FILENO, buf, strlen(buf));
	}
	_exit(1);
}