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/*
* NOTE:
*
* This file imported from the Squid project. The licence below is
* reproduced intact, but refers to files in Squid's repository, not
* in Samba. See COPYING for the GPLv3 notice (being the later
* version mentioned below).
*
* This file has also been modified, in particular to use talloc to
* allocate in rfc1738_escape()
*
* - Andrew Bartlett Oct-2009
*
*/
/*
* $Id$
*
* DEBUG:
* AUTHOR: Harvest Derived
*
* SQUID Web Proxy Cache http://www.squid-cache.org/
* ----------------------------------------------------------
*
* Squid is the result of efforts by numerous individuals from
* the Internet community; see the CONTRIBUTORS file for full
* details. Many organizations have provided support for Squid's
* development; see the SPONSORS file for full details. Squid is
* Copyrighted (C) 2001 by the Regents of the University of
* California; see the COPYRIGHT file for full details. Squid
* incorporates software developed and/or copyrighted by other
* sources; see the CREDITS file for full details.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
*
*/
#include "includes.h"
#include "util.h"
/*
* RFC 1738 defines that these characters should be escaped, as well
* any non-US-ASCII character or anything between 0x00 - 0x1F.
*/
static char rfc1738_unsafe_chars[] = {
(char) 0x3C, /* < */
(char) 0x3E, /* > */
(char) 0x22, /* " */
(char) 0x23, /* # */
#if 0 /* done in code */
(char) 0x25, /* % */
#endif
(char) 0x7B, /* { */
(char) 0x7D, /* } */
(char) 0x7C, /* | */
(char) 0x5C, /* \ */
(char) 0x5E, /* ^ */
(char) 0x7E, /* ~ */
(char) 0x5B, /* [ */
(char) 0x5D, /* ] */
(char) 0x60, /* ` */
(char) 0x27, /* ' */
(char) 0x20 /* space */
};
static char rfc1738_reserved_chars[] = {
(char) 0x3b, /* ; */
(char) 0x2f, /* / */
(char) 0x3f, /* ? */
(char) 0x3a, /* : */
(char) 0x40, /* @ */
(char) 0x3d, /* = */
(char) 0x26 /* & */
};
/*
* rfc1738_escape - Returns a static buffer contains the RFC 1738
* compliant, escaped version of the given url.
*
*/
static char *
rfc1738_do_escape(TALLOC_CTX *mem_ctx, const char *url, int encode_reserved)
{
size_t bufsize = 0;
const char *p;
char *buf;
char *q;
unsigned int i, do_escape;
bufsize = strlen(url) * 3 + 1;
buf = talloc_array(mem_ctx, char, bufsize);
if (!buf) {
return NULL;
}
talloc_set_name_const(buf, buf);
buf[0] = '\0';
for (p = url, q = buf; *p != '\0' && q < (buf + bufsize - 1); p++, q++) {
do_escape = 0;
/* RFC 1738 defines these chars as unsafe */
for (i = 0; i < sizeof(rfc1738_unsafe_chars); i++) {
if (*p == rfc1738_unsafe_chars[i]) {
do_escape = 1;
break;
}
}
/* Handle % separately */
if (encode_reserved >= 0 && *p == '%')
do_escape = 1;
/* RFC 1738 defines these chars as reserved */
for (i = 0; i < sizeof(rfc1738_reserved_chars) && encode_reserved > 0; i++) {
if (*p == rfc1738_reserved_chars[i]) {
do_escape = 1;
break;
}
}
/* RFC 1738 says any control chars (0x00-0x1F) are encoded */
if ((unsigned char) *p <= (unsigned char) 0x1F) {
do_escape = 1;
}
/* RFC 1738 says 0x7f is encoded */
if (*p == (char) 0x7F) {
do_escape = 1;
}
/* RFC 1738 says any non-US-ASCII are encoded */
if (((unsigned char) *p >= (unsigned char) 0x80)) {
do_escape = 1;
}
/* Do the triplet encoding, or just copy the char */
/* note: while we do not need snprintf here as q is appropriately
* allocated, Samba does to avoid our macro banning it -- abartlet */
if (do_escape == 1) {
(void) snprintf(q, 4, "%%%02X", (unsigned char) *p);
q += sizeof(char) * 2;
} else {
*q = *p;
}
}
*q = '\0';
return (buf);
}
/*
* rfc1738_escape - Returns a buffer that contains the RFC
* 1738 compliant, escaped version of the given url. (escapes unsafe and % characters)
*/
char *
rfc1738_escape(TALLOC_CTX *mem_ctx, const char *url)
{
return rfc1738_do_escape(mem_ctx, url, 0);
}
/*
* rfc1738_escape_unescaped - Returns a buffer that contains
* the RFC 1738 compliant, escaped version of the given url (escapes unsafe chars only)
*/
char *
rfc1738_escape_unescaped(TALLOC_CTX *mem_ctx, const char *url)
{
return rfc1738_do_escape(mem_ctx, url, -1);
}
/*
* rfc1738_escape_part - Returns a buffer that contains the RFC
* 1738 compliant, escaped version of the given url segment. (escapes
* unsafe, reserved and % chars) It would mangle the :// in http://,
* and mangle paths (because of /).
*/
char *
rfc1738_escape_part(TALLOC_CTX *mem_ctx, const char *url)
{
return rfc1738_do_escape(mem_ctx, url, 1);
}
/*
* rfc1738_unescape() - Converts escaped characters (%xy numbers) in
* given the string. %% is a %. %ab is the 8-bit hexadecimal number "ab"
*/
_PUBLIC_ void
rfc1738_unescape(char *s)
{
char hexnum[3];
int i, j; /* i is write, j is read */
unsigned int x;
for (i = j = 0; s[j]; i++, j++) {
s[i] = s[j];
if (s[i] != '%')
continue;
if (s[j + 1] == '%') { /* %% case */
j++;
continue;
}
if (s[j + 1] && s[j + 2]) {
if (s[j + 1] == '0' && s[j + 2] == '0') { /* %00 case */
j += 2;
continue;
}
hexnum[0] = s[j + 1];
hexnum[1] = s[j + 2];
hexnum[2] = '\0';
if (1 == sscanf(hexnum, "%x", &x)) {
s[i] = (char) (0x0ff & x);
j += 2;
}
}
}
s[i] = '\0';
}
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