bin/rcp/util.c

   1 /*-
   2  * Copyright (c) 1992, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)util.c   8.2 (Berkeley) 4/2/94
  30  * $FreeBSD: src/bin/rcp/util.c,v 1.9.2.3 2002/07/19 07:54:51 jmallett Exp $
  31  * $DragonFly: src/bin/rcp/util.c,v 1.5 2004/11/19 19:01:52 eirikn Exp $
  32  */
  33
  34 #include <sys/param.h>
  35 #include <sys/stat.h>
  36 #include <sys/wait.h>
  37
  38 #include <ctype.h>
  39 #include <err.h>
  40 #include <errno.h>
  41 #include <paths.h>
  42 #include <signal.h>
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <unistd.h>
  47
  48 #include "extern.h"
  49
  50 char *
  51 colon(char *cp)
  52 {
  53         if (*cp == ':')         /* Leading colon is part of file name. */
  54                 return (0);
  55
  56         for (; *cp; ++cp) {
  57                 if (*cp == ':')
  58                         return (cp);
  59                 if (*cp == '/')
  60                         return (0);
  61         }
  62         return (0);
  63 }
  64
  65 void
  66 verifydir(char *cp)
  67 {
  68         struct stat stb;
  69
  70         if (!stat(cp, &stb)) {
  71                 if (S_ISDIR(stb.st_mode))
  72                         return;
  73                 errno = ENOTDIR;
  74         }
  75         run_err("%s: %s", cp, strerror(errno));
  76         exit(1);
  77 }
  78
  79 int
  80 okname(char *cp0)
  81 {
  82         int c;
  83         char *cp;
  84
  85         cp = cp0;
  86         do {
  87                 c = *cp;
  88                 if (c & 0200)
  89                         goto bad;
  90                 if (!isalpha(c) && !isdigit(c) && c != '_' && c != '-' && c != '.')
  91                         goto bad;
  92         } while (*++cp);
  93         return (1);
  94
  95 bad:    warnx("%s: invalid user name", cp0);
  96         return (0);
  97 }
  98
  99 int
 100 susystem(char *s, int userid)
 101 {
 102         sig_t istat, qstat;
 103         int status;
 104         pid_t pid;
 105
 106         pid = vfork();
 107         switch (pid) {
 108         case -1:
 109                 return (127);
 110
 111         case 0:
 112                 setuid(userid);
 113                 execl(_PATH_BSHELL, "sh", "-c", s, NULL);
 114                 _exit(127);
 115         }
 116         istat = signal(SIGINT, SIG_IGN);
 117         qstat = signal(SIGQUIT, SIG_IGN);
 118         if (waitpid(pid, &status, 0) < 0)
 119                 status = -1;
 120         signal(SIGINT, istat);
 121         signal(SIGQUIT, qstat);
 122         return (status);
 123 }
 124
 125 BUF *
 126 allocbuf(BUF *bp, int fd, int blksize)
 127 {
 128         struct stat stb;
 129         size_t size;
 130
 131         if (fstat(fd, &stb) < 0) {
 132                 run_err("fstat: %s", strerror(errno));
 133                 return (0);
 134         }
 135         size = roundup(stb.st_blksize, blksize);
 136         if (size == 0)
 137                 size = blksize;
 138         if (bp->cnt >= size)
 139                 return (bp);
 140         if ((bp->buf = realloc(bp->buf, size)) == NULL) {
 141                 bp->cnt = 0;
 142                 run_err("%s", strerror(errno));
 143                 return (0);
 144         }
 145         bp->cnt = size;
 146         return (bp);
 147 }
 148
 149 /* ARGSUSED */
 150 void
 151 lostconn(int signo __unused)
 152 {
 153         if (!iamremote)
 154                 warnx("lost connection");
 155         exit(1);
 156 }