bin/rcp/util.c

   1 /*      $NetBSD: util.c,v 1.10 2006/12/15 20:22:33 christos 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 1.10 2006/12/15 20:22:33 christos 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 char *
  73 unbracket(char *cp)
  74 {
  75         char *ep;
  76
  77         if (*cp == '[') {
  78                 ep = cp + (strlen(cp) - 1);
  79                 if (*ep == ']') {
  80                         *ep = '\0';
  81                         ++cp;
  82                 }
  83         }
  84         return (cp);
  85 }
  86
  87 void
  88 verifydir(char *cp)
  89 {
  90         struct stat stb;
  91
  92         if (!stat(cp, &stb)) {
  93                 if (S_ISDIR(stb.st_mode))
  94                         return;
  95                 errno = ENOTDIR;
  96         }
  97         run_err("%s: %s", cp, strerror(errno));
  98         exit(1);
  99         /* NOTREACHED */
 100 }
 101
 102 int
 103 okname(char *cp0)
 104 {
 105         int c;
 106         char *cp;
 107
 108         cp = cp0;
 109         do {
 110                 c = *cp;
 111                 if (c & 0200)
 112                         goto bad;
 113                 if (!isalpha(c) && !isdigit(c) && c != '_' && c != '-')
 114                         goto bad;
 115         } while (*++cp);
 116         return (1);
 117
 118 bad:    warnx("%s: invalid user name", cp0);
 119         return (0);
 120 }
 121
 122 int
 123 susystem(char *s)
 124 {
 125         sig_t istat, qstat;
 126         int status;
 127         pid_t pid;
 128
 129         pid = vfork();
 130         switch (pid) {
 131         case -1:
 132                 return (127);
 133
 134         case 0:
 135                 (void)execl(_PATH_BSHELL, "sh", "-c", s, NULL);
 136                 _exit(127);
 137                 /* NOTREACHED */
 138         }
 139         istat = signal(SIGINT, SIG_IGN);
 140         qstat = signal(SIGQUIT, SIG_IGN);
 141         if (waitpid(pid, &status, 0) < 0)
 142                 status = -1;
 143         (void)signal(SIGINT, istat);
 144         (void)signal(SIGQUIT, qstat);
 145         return (status);
 146 }
 147
 148 BUF *
 149 allocbuf(BUF *bp, int fd, int blksize)
 150 {
 151         struct stat stb;
 152         size_t size;
 153         char *nbuf;
 154
 155         if (fstat(fd, &stb) < 0) {
 156                 run_err("fstat: %s", strerror(errno));
 157                 return (0);
 158         }
 159         size = roundup(stb.st_blksize, blksize);
 160         if (size == 0)
 161                 size = blksize;
 162         if (bp->cnt >= size)
 163                 return (bp);
 164         if ((nbuf = realloc(bp->buf, size)) == NULL) {
 165                 free(bp->buf);
 166                 bp->buf = NULL;
 167                 bp->cnt = 0;
 168                 run_err("%s", strerror(errno));
 169                 return (0);
 170         }
 171         bp->buf = nbuf;
 172         bp->cnt = size;
 173         return (bp);
 174 }
 175
 176 void
 177 /*ARGSUSED*/
 178 lostconn(int signo __unused)
 179 {
 180         if (!iamremote)
 181                 warnx("lost connection");
 182         exit(1);
 183         /* NOTREACHED */
 184 }