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