rework susystem

[unix-history] / usr / src / bin / rcp / util.c

/*-
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
static char sccsid[] = "@(#)util.c	8.2 (Berkeley) %G%";
#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;
{
	if (*cp == ':')		/* Leading colon is part of file name. */
		return (0);

	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, 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(bp, fd, blksize)
	BUF *bp;
	int fd, blksize;
{
	struct stat stb;
	size_t size;

	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 ((bp->buf = realloc(bp->buf, size)) == NULL) {
		bp->cnt = 0;
		run_err("%s", strerror(errno));
		return (0);
	}
	bp->cnt = size;
	return (bp);
}

void
lostconn(signo)
	int signo;
{
	if (!iamremote)
		warnx("lost connection");
	exit(1);
}