Home | History | Annotate | Line # | Download | only in rcp
util.c revision 1.8 
      1 /*	$NetBSD: util.c,v 1.8 2005/02/17 15:25:02 xtraeme 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 1.8 2005/02/17 15:25:02 xtraeme 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(char *cp)
     59 {
     60 	if (*cp == ':')		/* Leading colon is part of file name. */
     61 		return (0);
     62 
     63 	for (; *cp; ++cp) {
     64 		if (*cp == ':')
     65 			return (cp);
     66 		if (*cp == '/')
     67 			return (0);
     68 	}
     69 	return (0);
     70 }
     71 
     72 void
     73 verifydir(char *cp)
     74 {
     75 	struct stat stb;
     76 
     77 	if (!stat(cp, &stb)) {
     78 		if (S_ISDIR(stb.st_mode))
     79 			return;
     80 		errno = ENOTDIR;
     81 	}
     82 	run_err("%s: %s", cp, strerror(errno));
     83 	exit(1);
     84 	/* NOTREACHED */
     85 }
     86 
     87 int
     88 okname(char *cp0)
     89 {
     90 	int c;
     91 	char *cp;
     92 
     93 	cp = cp0;
     94 	do {
     95 		c = *cp;
     96 		if (c & 0200)
     97 			goto bad;
     98 		if (!isalpha(c) && !isdigit(c) && c != '_' && c != '-')
     99 			goto bad;
    100 	} while (*++cp);
    101 	return (1);
    102 
    103 bad:	warnx("%s: invalid user name", cp0);
    104 	return (0);
    105 }
    106 
    107 int
    108 susystem(char *s)
    109 {
    110 	sig_t istat, qstat;
    111 	int status;
    112 	pid_t pid;
    113 
    114 	pid = vfork();
    115 	switch (pid) {
    116 	case -1:
    117 		return (127);
    118 
    119 	case 0:
    120 		execl(_PATH_BSHELL, "sh", "-c", s, NULL);
    121 		_exit(127);
    122 		/* NOTREACHED */
    123 	}
    124 	istat = signal(SIGINT, SIG_IGN);
    125 	qstat = signal(SIGQUIT, SIG_IGN);
    126 	if (waitpid(pid, &status, 0) < 0)
    127 		status = -1;
    128 	(void)signal(SIGINT, istat);
    129 	(void)signal(SIGQUIT, qstat);
    130 	return (status);
    131 }
    132 
    133 BUF *
    134 allocbuf(BUF *bp, int fd, int blksize)
    135 {
    136 	struct stat stb;
    137 	size_t size;
    138 	char *nbuf;
    139 
    140 	if (fstat(fd, &stb) < 0) {
    141 		run_err("fstat: %s", strerror(errno));
    142 		return (0);
    143 	}
    144 	size = roundup(stb.st_blksize, blksize);
    145 	if (size == 0)
    146 		size = blksize;
    147 	if (bp->cnt >= size)
    148 		return (bp);
    149 	if ((nbuf = realloc(bp->buf, size)) == NULL) {
    150 		free(bp->buf);
    151 		bp->buf = NULL;
    152 		bp->cnt = 0;
    153 		run_err("%s", strerror(errno));
    154 		return (0);
    155 	}
    156 	bp->buf = nbuf;
    157 	bp->cnt = size;
    158 	return (bp);
    159 }
    160 
    161 void
    162 lostconn(int signo)
    163 {
    164 	if (!iamremote)
    165 		warnx("lost connection");
    166 	exit(1);
    167 	/* NOTREACHED */
    168 }
    169