129 lines
3.1 KiB
C
129 lines
3.1 KiB
C
/*
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*****************************************************************************
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*
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* File: utils.c
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*
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* Author: Damien S. Stuart
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*
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* Purpose: General/Generic functions for the fwknop client.
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*
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* Copyright 2009-2010 Damien Stuart (dstuart@dstuart.org)
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*
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* License (GNU Public License):
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*
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*****************************************************************************
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*/
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#include "common.h"
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#include "fwknop_common.h"
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#include "utils.h"
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/* Generic hex dump function.
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*/
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void
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hex_dump(const unsigned char *data, const int size)
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{
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int ln, i, j = 0;
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char ascii_str[17] = {0};
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for(i=0; i<size; i++)
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{
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if((i % 16) == 0)
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{
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printf(" %s\n 0x%.4x: ", ascii_str, i);
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memset(ascii_str, 0x0, 17);
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j = 0;
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}
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printf("%.2x ", data[i]);
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ascii_str[j++] = (data[i] < 0x20 || data[i] > 0x7e) ? '.' : data[i];
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if(j == 8)
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printf(" ");
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}
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/* Remainder...
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*/
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ln = strlen(ascii_str);
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if(ln > 0)
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{
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for(i=0; i < 16-ln; i++)
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printf(" ");
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printf(" %s\n\n", ascii_str);
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}
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}
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int
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verify_file_perms_ownership(const char *file)
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{
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int res = 1;
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#if HAVE_STAT
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struct stat st;
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/* Every file that the fwknop client deals with should be owned
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* by the user and permissions set to 600 (user read/write)
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*/
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if((stat(file, &st)) != 0)
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{
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/* if the path doesn't exist, just return, but otherwise something
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* went wrong
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*/
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if(errno == ENOENT)
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{
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return 0;
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} else {
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fprintf(stderr, "[-] stat() against file: %s returned: %s\n",
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file, strerror(errno));
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exit(EXIT_FAILURE);
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}
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}
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/* Make sure it is a regular file or symbolic link
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*/
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if(S_ISREG(st.st_mode) != 1 && S_ISLNK(st.st_mode) != 1)
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{
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fprintf(stderr,
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"[-] file: %s is not a regular file or symbolic link.\n",
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file
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);
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res = 0;
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}
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if((st.st_mode & (S_IRWXU|S_IRWXG|S_IRWXO)) != (S_IRUSR|S_IWUSR))
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{
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fprintf(stderr,
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"[-] file: %s permissions should only be user read/write (0600, -rw-------)\n",
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file
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);
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res = 0;
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}
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if(st.st_uid != getuid())
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{
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fprintf(stderr, "[-] file: %s not owned by current effective user id.\n",
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file);
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res = 0;
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}
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#endif
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return res;
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}
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/***EOF***/
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