| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /*************************************************************************** |
| * Description: URL manipulation subroutines. (ported from mod_proxy). * |
| * Version: $Revision: 531816 $ * |
| ***************************************************************************/ |
| |
| #include "jk_global.h" |
| #include "jk_url.h" |
| |
| static void jk_c2hex(int ch, char *x) |
| { |
| #if !CHARSET_EBCDIC |
| int i; |
| |
| x[0] = '%'; |
| i = (ch & 0xF0) >> 4; |
| if (i >= 10) { |
| x[1] = ('A' - 10) + i; |
| } |
| else { |
| x[1] = '0' + i; |
| } |
| |
| i = ch & 0x0F; |
| if (i >= 10) { |
| x[2] = ('A' - 10) + i; |
| } |
| else { |
| x[2] = '0' + i; |
| } |
| #else /*CHARSET_EBCDIC*/ |
| static const char ntoa[] = { "0123456789ABCDEF" }; |
| char buf[1]; |
| |
| ch &= 0xFF; |
| |
| buf[0] = ch; |
| jk_xlate_to_ascii(buf, 1); |
| |
| x[0] = '%'; |
| x[1] = ntoa[(buf[0] >> 4) & 0x0F]; |
| x[2] = ntoa[buf[0] & 0x0F]; |
| x[3] = '\0'; |
| #endif /*CHARSET_EBCDIC*/ |
| } |
| |
| /* |
| * Convert a URL-encoded string to canonical form. |
| * It encodes those which must be encoded, and does not touch |
| * those which must not be touched. |
| * String x must be '\0'-terminated. |
| * String y must be pre-allocated with len maxlen |
| * (including the terminating '\0'). |
| */ |
| int jk_canonenc(const char *x, char *y, int maxlen) |
| { |
| int i, j; |
| int ch = x[0]; |
| char *allowed; /* characters which should not be encoded */ |
| char *reserved; /* characters which much not be en/de-coded */ |
| |
| /* |
| * N.B. in addition to :@&=, this allows ';' in an http path |
| * and '?' in an ftp path -- this may be revised |
| */ |
| allowed = "~$-_.+!*'(),;:@&="; |
| reserved = "/"; |
| |
| for (i = 0, j = 0; ch != '\0' && j < maxlen; i++, j++, ch=x[i]) { |
| /* always handle '/' first */ |
| if (strchr(reserved, ch)) { |
| y[j] = ch; |
| continue; |
| } |
| /* recode it, if necessary */ |
| if (!jk_isalnum(ch) && !strchr(allowed, ch)) { |
| if (j+2<maxlen) { |
| jk_c2hex(ch, &y[j]); |
| j += 2; |
| } |
| else { |
| return JK_FALSE; |
| } |
| } |
| else { |
| y[j] = ch; |
| } |
| } |
| if (j<maxlen) { |
| y[j] = '\0'; |
| return JK_TRUE; |
| } |
| else { |
| return JK_FALSE; |
| } |
| } |
| |
| #if USE_CHARSET_EBCDIC |
| static int convert_a2e[256] = { |
| 0x00, 0x01, 0x02, 0x03, 0x37, 0x2D, 0x2E, 0x2F, 0x16, 0x05, 0x15, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, |
| 0x10, 0x11, 0x12, 0x13, 0x3C, 0x3D, 0x32, 0x26, 0x18, 0x19, 0x3F, 0x27, 0x1C, 0x1D, 0x1E, 0x1F, |
| 0x40, 0x5A, 0x7F, 0x7B, 0x5B, 0x6C, 0x50, 0x7D, 0x4D, 0x5D, 0x5C, 0x4E, 0x6B, 0x60, 0x4B, 0x61, |
| 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, 0x7A, 0x5E, 0x4C, 0x7E, 0x6E, 0x6F, |
| 0x7C, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, |
| 0xD7, 0xD8, 0xD9, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xAD, 0xE0, 0xBD, 0x5F, 0x6D, |
| 0x79, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, |
| 0x97, 0x98, 0x99, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, 0xA9, 0xC0, 0x4F, 0xD0, 0xA1, 0x07, |
| 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x06, 0x17, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x09, 0x0A, 0x1B, |
| 0x30, 0x31, 0x1A, 0x33, 0x34, 0x35, 0x36, 0x08, 0x38, 0x39, 0x3A, 0x3B, 0x04, 0x14, 0x3E, 0xFF, |
| 0x41, 0xAA, 0x4A, 0xB1, 0x9F, 0xB2, 0x6A, 0xB5, 0xBB, 0xB4, 0x9A, 0x8A, 0xB0, 0xCA, 0xAF, 0xBC, |
| 0x90, 0x8F, 0xEA, 0xFA, 0xBE, 0xA0, 0xB6, 0xB3, 0x9D, 0xDA, 0x9B, 0x8B, 0xB7, 0xB8, 0xB9, 0xAB, |
| 0x64, 0x65, 0x62, 0x66, 0x63, 0x67, 0x9E, 0x68, 0x74, 0x71, 0x72, 0x73, 0x78, 0x75, 0x76, 0x77, |
| 0xAC, 0x69, 0xED, 0xEE, 0xEB, 0xEF, 0xEC, 0xBF, 0x80, 0xFD, 0xFE, 0xFB, 0xFC, 0xBA, 0xAE, 0x59, |
| 0x44, 0x45, 0x42, 0x46, 0x43, 0x47, 0x9C, 0x48, 0x54, 0x51, 0x52, 0x53, 0x58, 0x55, 0x56, 0x57, |
| 0x8C, 0x49, 0xCD, 0xCE, 0xCB, 0xCF, 0xCC, 0xE1, 0x70, 0xDD, 0xDE, 0xDB, 0xDC, 0x8D, 0x8E, 0xDF }; |
| #endif /*USE_CHARSET_EBCDIC*/ |
| |
| static char x2c(const char *what) |
| { |
| register char digit; |
| |
| #if !USE_CHARSET_EBCDIC |
| digit = |
| ((what[0] >= 'A') ? ((what[0] & 0xdf) - 'A') + 10 : (what[0] - '0')); |
| digit *= 16; |
| digit += (what[1] >= 'A' ? ((what[1] & 0xdf) - 'A') + 10 : (what[1] - '0')); |
| #else /*USE_CHARSET_EBCDIC*/ |
| char xstr[5]; |
| xstr[0]='0'; |
| xstr[1]='x'; |
| xstr[2]=what[0]; |
| xstr[3]=what[1]; |
| xstr[4]='\0'; |
| digit = convert_a2e[0xFF & strtol(xstr, NULL, 16)]; |
| #endif /*USE_CHARSET_EBCDIC*/ |
| return (digit); |
| } |
| |
| #define jk_isxdigit(c) (isxdigit(((unsigned char)(c)))) |
| |
| /** |
| * Unescapes a URL, leaving reserved characters intact. |
| * @param unescaped Optional buffer to write the encoded string, can be |
| * NULL, in which case the URL decoding does not actually take place |
| * but the result length of the decoded URL will be returned. |
| * @param url String to be unescaped |
| * @param slen The length of the original url, or -1 to decode until |
| * a terminating '\0' is seen |
| * @param forbid Optional list of forbidden characters, in addition to |
| * 0x00 |
| * @param reserved Optional list of reserved characters that will be |
| * left unescaped |
| * @param plus If non zero, '+' is converted to ' ' as per |
| * application/x-www-form-urlencoded encoding |
| * @param len If set, the length of the unescaped string will be returned |
| * @return JK_TRUE on success, JK_FALSE if no characters are |
| * decoded or the string is NULL, if a bad escape sequence is |
| * found, or if a character on the forbid list is found. |
| * Implementation copied from APR 1.5.x. |
| */ |
| int jk_unescape_url(char *const unescaped, |
| const char *const url, |
| size_t slen, |
| const char *const forbid, |
| const char *const reserved, |
| const int plus, |
| size_t *len) |
| { |
| size_t size = 1; |
| int found = 0; |
| const char *s = (const char *) url; |
| char *d = (char *) unescaped; |
| register int badesc, badpath; |
| |
| if (!url) { |
| return JK_FALSE; |
| } |
| |
| badesc = 0; |
| badpath = 0; |
| if (s) { |
| if (d) { |
| for (; *s && slen; ++s, d++, slen--) { |
| if (plus && *s == '+') { |
| *d = ' '; |
| found = 1; |
| } |
| else if (*s != '%') { |
| *d = *s; |
| } |
| else { |
| if (!jk_isxdigit(*(s + 1)) || !jk_isxdigit(*(s + 2))) { |
| badesc = 1; |
| *d = '%'; |
| } |
| else { |
| char decoded; |
| decoded = x2c(s + 1); |
| if ((decoded == '\0') |
| || (forbid && strchr(forbid, decoded))) { |
| badpath = 1; |
| *d = decoded; |
| s += 2; |
| slen -= 2; |
| } |
| else if (reserved && strchr(reserved, decoded)) { |
| *d++ = *s++; |
| *d++ = *s++; |
| *d = *s; |
| size += 2; |
| } |
| else { |
| *d = decoded; |
| s += 2; |
| slen -= 2; |
| found = 1; |
| } |
| } |
| } |
| size++; |
| } |
| *d = '\0'; |
| } |
| else { |
| for (; *s && slen; ++s, slen--) { |
| if (plus && *s == '+') { |
| found = 1; |
| } |
| else if (*s != '%') { |
| /* character unchanged */ |
| } |
| else { |
| if (!jk_isxdigit(*(s + 1)) || !jk_isxdigit(*(s + 2))) { |
| badesc = 1; |
| } |
| else { |
| char decoded; |
| decoded = x2c(s + 1); |
| if ((decoded == '\0') |
| || (forbid && strchr(forbid, decoded))) { |
| badpath = 1; |
| s += 2; |
| slen -= 2; |
| } |
| else if (reserved && strchr(reserved, decoded)) { |
| s += 2; |
| slen -= 2; |
| size += 2; |
| } |
| else { |
| s += 2; |
| slen -= 2; |
| found = 1; |
| } |
| } |
| } |
| size++; |
| } |
| } |
| } |
| |
| if (len) { |
| *len = size; |
| } |
| if (badesc) { |
| return JK_FALSE; |
| } |
| else if (badpath) { |
| return JK_FALSE; |
| } |
| else if (!found) { |
| return JK_TRUE; |
| } |
| |
| return JK_TRUE; |
| } |
