rcp.tproj/util.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*-
  26  * Copyright (c) 1992, 1993
  27  *      The Regents of the University of California.  All rights reserved.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  * 1. Redistributions of source code must retain the above copyright
  33  *    notice, this list of conditions and the following disclaimer.
  34  * 2. Redistributions in binary form must reproduce the above copyright
  35  *    notice, this list of conditions and the following disclaimer in the
  36  *    documentation and/or other materials provided with the distribution.
  37  * 3. All advertising materials mentioning features or use of this software
  38  *    must display the following acknowledgement:
  39  *      This product includes software developed by the University of
  40  *      California, Berkeley and its contributors.
  41  * 4. Neither the name of the University nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  */
  57
  58
  59 #include <sys/param.h>
  60 #include <sys/stat.h>
  61 #include <sys/wait.h>
  62
  63 #include <ctype.h>
  64 #include <err.h>
  65 #include <errno.h>
  66 #include <paths.h>
  67 #include <signal.h>
  68 #include <stdio.h>
  69 #include <stdlib.h>
  70 #include <string.h>
  71 #include <unistd.h>
  72
  73 #include "extern.h"
  74
  75 char *
  76 colon(cp)
  77         char *cp;
  78 {
  79         if (*cp == ':')         /* Leading colon is part of file name. */
  80                 return (0);
  81
  82         for (; *cp; ++cp) {
  83                 if (*cp == ':')
  84                         return (cp);
  85                 if (*cp == '/')
  86                         return (0);
  87         }
  88         return (0);
  89 }
  90
  91 void
  92 verifydir(cp)
  93         char *cp;
  94 {
  95         struct stat stb;
  96
  97         if (!stat(cp, &stb)) {
  98                 if (S_ISDIR(stb.st_mode))
  99                         return;
 100                 errno = ENOTDIR;
 101         }
 102         run_err("%s: %s", cp, strerror(errno));
 103         exit(1);
 104 }
 105
 106 int
 107 okname(cp0)
 108         char *cp0;
 109 {
 110         int c;
 111         char *cp;
 112
 113         cp = cp0;
 114         do {
 115                 c = *cp;
 116                 if (c & 0200)
 117                         goto bad;
 118                 if (!isalpha(c) && !isdigit(c) && c != '_' && c != '-')
 119                         goto bad;
 120         } while (*++cp);
 121         return (1);
 122
 123 bad:    warnx("%s: invalid user name", cp0);
 124         return (0);
 125 }
 126
 127 int
 128 susystem(s, userid)
 129         int userid;
 130         char *s;
 131 {
 132         sig_t istat, qstat;
 133         int status, w;
 134         pid_t pid;
 135
 136         pid = vfork();
 137         switch (pid) {
 138         case -1:
 139                 return (127);
 140
 141         case 0:
 142                 (void)setuid(userid);
 143                 execl(_PATH_BSHELL, "sh", "-c", s, NULL);
 144                 _exit(127);
 145         }
 146         istat = signal(SIGINT, SIG_IGN);
 147         qstat = signal(SIGQUIT, SIG_IGN);
 148         if (waitpid(pid, &status, 0) < 0)
 149                 status = -1;
 150         (void)signal(SIGINT, istat);
 151         (void)signal(SIGQUIT, qstat);
 152         return (status);
 153 }
 154
 155 BUF *
 156 allocbuf(bp, fd, blksize)
 157         BUF *bp;
 158         int fd, blksize;
 159 {
 160         struct stat stb;
 161         size_t size;
 162
 163         if (fstat(fd, &stb) < 0) {
 164                 run_err("fstat: %s", strerror(errno));
 165                 return (0);
 166         }
 167         size = roundup(stb.st_blksize, blksize);
 168         if (size == 0)
 169                 size = blksize;
 170         if (bp->cnt >= size)
 171                 return (bp);
 172         if ((bp->buf = realloc(bp->buf, size)) == NULL) {
 173                 bp->cnt = 0;
 174                 run_err("%s", strerror(errno));
 175                 return (0);
 176         }
 177         bp->cnt = size;
 178         return (bp);
 179 }
 180
 181 void
 182 lostconn(signo)
 183         int signo;
 184 {
 185         if (!iamremote)
 186                 warnx("lost connection");
 187         exit(1);
 188 }