1/* Licensed to the Apache Software Foundation (ASF) under one or more 2 * contributor license agreements. See the NOTICE file distributed with 3 * this work for additional information regarding copyright ownership. 4 * The ASF licenses this file to You under the Apache License, Version 2.0 5 * (the "License"); you may not use this file except in compliance with 6 * the License. You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#if defined(WIN32) || defined(OS2) 18#define NEED_ENHANCED_ESCAPES 19#endif 20 21#include <stdio.h> 22#include <string.h> 23#include <stdio.h> 24#include <ctype.h> 25 26/* A bunch of functions in util.c scan strings looking for certain characters. 27 * To make that more efficient we encode a lookup table. 28 */ 29#define T_ESCAPE_SHELL_CMD (0x01) 30#define T_ESCAPE_PATH_SEGMENT (0x02) 31#define T_OS_ESCAPE_PATH (0x04) 32#define T_ESCAPE_ECHO (0x08) 33#define T_ESCAPE_URLENCODED (0x10) 34#define T_ESCAPE_XML (0x20) 35 36int main(int argc, char *argv[]) 37{ 38 unsigned c; 39 unsigned char flags; 40 41 printf("/* this file is automatically generated by gen_test_char, " 42 "do not edit. \"make include/private/apr_escape_test_char.h\" to regenerate. */\n" 43 "#define T_ESCAPE_SHELL_CMD (%u)\n" 44 "#define T_ESCAPE_PATH_SEGMENT (%u)\n" 45 "#define T_OS_ESCAPE_PATH (%u)\n" 46 "#define T_ESCAPE_ECHO (%u)\n" 47 "#define T_ESCAPE_URLENCODED (%u)\n" 48 "#define T_ESCAPE_XML (%u)\n" 49 "\n" 50 "static const unsigned char test_char_table[256] = {", 51 T_ESCAPE_SHELL_CMD, 52 T_ESCAPE_PATH_SEGMENT, 53 T_OS_ESCAPE_PATH, 54 T_ESCAPE_ECHO, 55 T_ESCAPE_URLENCODED, 56 T_ESCAPE_XML); 57 58 for (c = 0; c < 256; ++c) { 59 flags = 0; 60 if (c % 20 == 0) 61 printf("\n "); 62 63 /* escape_shell_cmd */ 64#ifdef NEED_ENHANCED_ESCAPES 65 /* Win32/OS2 have many of the same vulnerable characters 66 * as Unix sh, plus the carriage return and percent char. 67 * The proper escaping of these characters varies from unix 68 * since Win32/OS2 use carets or doubled-double quotes, 69 * and neither lf nor cr can be escaped. We escape unix 70 * specific as well, to assure that cross-compiled unix 71 * applications behave similiarly when invoked on win32/os2. 72 * 73 * Rem please keep in-sync with apr's list in win32/filesys.c 74 */ 75 if (c && strchr("&;`'\"|*?~<>^()[]{}$\\\n\r%", c)) { 76 flags |= T_ESCAPE_SHELL_CMD; 77 } 78#else 79 if (c && strchr("&;`'\"|*?~<>^()[]{}$\\\n", c)) { 80 flags |= T_ESCAPE_SHELL_CMD; 81 } 82#endif 83 84 if (!isalnum(c) && !strchr("$-_.+!*'(),:@&=~", c)) { 85 flags |= T_ESCAPE_PATH_SEGMENT; 86 } 87 88 if (!isalnum(c) && !strchr("$-_.+!*'(),:@&=/~", c)) { 89 flags |= T_OS_ESCAPE_PATH; 90 } 91 92 if (!isalnum(c) && !strchr(".-*_ ", c)) { 93 flags |= T_ESCAPE_URLENCODED; 94 } 95 96 /* For logging, escape all control characters, 97 * double quotes (because they delimit the request in the log file) 98 * backslashes (because we use backslash for escaping) 99 * and 8-bit chars with the high bit set 100 */ 101 if (c && (!isprint(c) || c == '"' || c == '\\' || iscntrl(c))) { 102 flags |= T_ESCAPE_ECHO; 103 } 104 105 if (strchr("<>&\"", c)) { 106 flags |= T_ESCAPE_XML; 107 } 108 109 printf("%u%c", flags, (c < 255) ? ',' : ' '); 110 } 111 112 printf("\n};\n"); 113 114 return 0; 115} 116