1 /*- 2 * Copyright (c) 2003-2007 Tim Kientzle 3 * 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 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include "archive_platform.h" 27 __FBSDID("$FreeBSD: head/lib/libarchive/archive_check_magic.c 201089 2009-12-28 02:20:23Z kientzle $"); 28 29 #ifdef HAVE_SYS_TYPES_H 30 #include <sys/types.h> 31 #endif 32 33 #include <stdio.h> 34 #ifdef HAVE_STDLIB_H 35 #include <stdlib.h> 36 #endif 37 #ifdef HAVE_STRING_H 38 #include <string.h> 39 #endif 40 #ifdef HAVE_UNISTD_H 41 #include <unistd.h> 42 #endif 43 #if defined(_WIN32) && !defined(__CYGWIN__) 44 #include <windows.h> 45 #include <winbase.h> 46 #endif 47 48 #include "archive_private.h" 49 50 static void 51 errmsg(const char *m) 52 { 53 size_t s = strlen(m); 54 ssize_t written; 55 56 while (s > 0) { 57 written = write(2, m, strlen(m)); 58 if (written <= 0) 59 return; 60 m += written; 61 s -= written; 62 } 63 } 64 65 static void 66 diediedie(void) 67 { 68 #if defined(_WIN32) && !defined(__CYGWIN__) && defined(_DEBUG) 69 /* Cause a breakpoint exception */ 70 DebugBreak(); 71 #endif 72 abort(); /* Terminate the program abnormally. */ 73 } 74 75 static const char * 76 state_name(unsigned s) 77 { 78 switch (s) { 79 case ARCHIVE_STATE_NEW: return ("new"); 80 case ARCHIVE_STATE_HEADER: return ("header"); 81 case ARCHIVE_STATE_DATA: return ("data"); 82 case ARCHIVE_STATE_EOF: return ("eof"); 83 case ARCHIVE_STATE_CLOSED: return ("closed"); 84 case ARCHIVE_STATE_FATAL: return ("fatal"); 85 default: return ("??"); 86 } 87 } 88 89 90 static void 91 write_all_states(unsigned int states) 92 { 93 unsigned int lowbit; 94 95 /* A trick for computing the lowest set bit. */ 96 while ((lowbit = states & (1 + ~states)) != 0) { 97 states &= ~lowbit; /* Clear the low bit. */ 98 errmsg(state_name(lowbit)); 99 if (states != 0) 100 errmsg("/"); 101 } 102 } 103 104 /* 105 * Check magic value and current state; bail if it isn't valid. 106 * 107 * This is designed to catch serious programming errors that violate 108 * the libarchive API. 109 */ 110 void 111 __archive_check_magic(struct archive *a, unsigned int magic, 112 unsigned int state, const char *function) 113 { 114 if (a->magic != magic) { 115 errmsg("INTERNAL ERROR: Function "); 116 errmsg(function); 117 errmsg(" invoked with invalid struct archive structure.\n"); 118 diediedie(); 119 } 120 121 if (state == ARCHIVE_STATE_ANY) 122 return; 123 124 if ((a->state & state) == 0) { 125 errmsg("INTERNAL ERROR: Function '"); 126 errmsg(function); 127 errmsg("' invoked with archive structure in state '"); 128 write_all_states(a->state); 129 errmsg("', should be in state '"); 130 write_all_states(state); 131 errmsg("'\n"); 132 diediedie(); 133 } 134 } 135