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qemu-e2k/util/uri.c
Max Reitz 2b21233061 util/uri: Add overflow check to rfc3986_parse_port 
And while at it, replace tabs by eight spaces in this function.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-Id: <1424887718-10800-2-git-send-email-mreitz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2015-03-18 12:05:31 +01:00

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/**
* uri.c: set of generic URI related routines
*
* Reference: RFCs 3986, 2732 and 2373
*
* Copyright (C) 1998-2003 Daniel Veillard. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* DANIEL VEILLARD BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* Except as contained in this notice, the name of Daniel Veillard shall not
* be used in advertising or otherwise to promote the sale, use or other
* dealings in this Software without prior written authorization from him.
*
* daniel@veillard.com
*
**
*
* Copyright (C) 2007, 2009-2010 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Authors:
* Richard W.M. Jones <rjones@redhat.com>
*
*/
#include <glib.h>
#include <string.h>
#include <stdio.h>
#include "qemu/uri.h"
static void uri_clean(URI *uri);
/*
* Old rule from 2396 used in legacy handling code
* alpha = lowalpha | upalpha
*/
#define IS_ALPHA(x) (IS_LOWALPHA(x) || IS_UPALPHA(x))
/*
* lowalpha = "a" | "b" | "c" | "d" | "e" | "f" | "g" | "h" | "i" | "j" |
* "k" | "l" | "m" | "n" | "o" | "p" | "q" | "r" | "s" | "t" |
* "u" | "v" | "w" | "x" | "y" | "z"
*/
#define IS_LOWALPHA(x) (((x) >= 'a') && ((x) <= 'z'))
/*
* upalpha = "A" | "B" | "C" | "D" | "E" | "F" | "G" | "H" | "I" | "J" |
* "K" | "L" | "M" | "N" | "O" | "P" | "Q" | "R" | "S" | "T" |
* "U" | "V" | "W" | "X" | "Y" | "Z"
*/
#define IS_UPALPHA(x) (((x) >= 'A') && ((x) <= 'Z'))
#ifdef IS_DIGIT
#undef IS_DIGIT
#endif
/*
* digit = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9"
*/
#define IS_DIGIT(x) (((x) >= '0') && ((x) <= '9'))
/*
* alphanum = alpha | digit
*/
#define IS_ALPHANUM(x) (IS_ALPHA(x) || IS_DIGIT(x))
/*
* mark = "-" | "_" | "." | "!" | "~" | "*" | "'" | "(" | ")"
*/
#define IS_MARK(x) (((x) == '-') || ((x) == '_') || ((x) == '.') || \
((x) == '!') || ((x) == '~') || ((x) == '*') || ((x) == '\'') || \
((x) == '(') || ((x) == ')'))
/*
* unwise = "{" | "}" | "|" | "\" | "^" | "`"
*/
#define IS_UNWISE(p) \
(((*(p) == '{')) || ((*(p) == '}')) || ((*(p) == '|')) || \
((*(p) == '\\')) || ((*(p) == '^')) || ((*(p) == '[')) || \
((*(p) == ']')) || ((*(p) == '`')))
/*
* reserved = ";" | "/" | "?" | ":" | "@" | "&" | "=" | "+" | "$" | "," |
* "[" | "]"
*/
#define IS_RESERVED(x) (((x) == ';') || ((x) == '/') || ((x) == '?') || \
((x) == ':') || ((x) == '@') || ((x) == '&') || ((x) == '=') || \
((x) == '+') || ((x) == '$') || ((x) == ',') || ((x) == '[') || \
((x) == ']'))
/*
* unreserved = alphanum | mark
*/
#define IS_UNRESERVED(x) (IS_ALPHANUM(x) || IS_MARK(x))
/*
* Skip to next pointer char, handle escaped sequences
*/
#define NEXT(p) ((*p == '%')? p += 3 : p++)
/*
* Productions from the spec.
*
* authority = server | reg_name
* reg_name = 1*( unreserved | escaped | "$" | "," |
* ";" | ":" | "@" | "&" | "=" | "+" )
*
* path = [ abs_path | opaque_part ]
*/
/************************************************************************
* *
* RFC 3986 parser *
* *
************************************************************************/
#define ISA_DIGIT(p) ((*(p) >= '0') && (*(p) <= '9'))
#define ISA_ALPHA(p) (((*(p) >= 'a') && (*(p) <= 'z')) || \
((*(p) >= 'A') && (*(p) <= 'Z')))
#define ISA_HEXDIG(p) \
(ISA_DIGIT(p) || ((*(p) >= 'a') && (*(p) <= 'f')) || \
((*(p) >= 'A') && (*(p) <= 'F')))
/*
* sub-delims = "!" / "$" / "&" / "'" / "(" / ")"
* / "*" / "+" / "," / ";" / "="
*/
#define ISA_SUB_DELIM(p) \
(((*(p) == '!')) || ((*(p) == '$')) || ((*(p) == '&')) || \
((*(p) == '(')) || ((*(p) == ')')) || ((*(p) == '*')) || \
((*(p) == '+')) || ((*(p) == ',')) || ((*(p) == ';')) || \
((*(p) == '=')) || ((*(p) == '\'')))
/*
* gen-delims = ":" / "/" / "?" / "#" / "[" / "]" / "@"
*/
#define ISA_GEN_DELIM(p) \
(((*(p) == ':')) || ((*(p) == '/')) || ((*(p) == '?')) || \
((*(p) == '#')) || ((*(p) == '[')) || ((*(p) == ']')) || \
((*(p) == '@')))
/*
* reserved = gen-delims / sub-delims
*/
#define ISA_RESERVED(p) (ISA_GEN_DELIM(p) || (ISA_SUB_DELIM(p)))
/*
* unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~"
*/
#define ISA_UNRESERVED(p) \
((ISA_ALPHA(p)) || (ISA_DIGIT(p)) || ((*(p) == '-')) || \
((*(p) == '.')) || ((*(p) == '_')) || ((*(p) == '~')))
/*
* pct-encoded = "%" HEXDIG HEXDIG
*/
#define ISA_PCT_ENCODED(p) \
((*(p) == '%') && (ISA_HEXDIG(p + 1)) && (ISA_HEXDIG(p + 2)))
/*
* pchar = unreserved / pct-encoded / sub-delims / ":" / "@"
*/
#define ISA_PCHAR(p) \
(ISA_UNRESERVED(p) || ISA_PCT_ENCODED(p) || ISA_SUB_DELIM(p) || \
((*(p) == ':')) || ((*(p) == '@')))
/**
* rfc3986_parse_scheme:
* @uri: pointer to an URI structure
* @str: pointer to the string to analyze
*
* Parse an URI scheme
*
* ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
*
* Returns 0 or the error code
*/
static int
rfc3986_parse_scheme(URI *uri, const char **str) {
const char *cur;
if (str == NULL)
return(-1);
cur = *str;
if (!ISA_ALPHA(cur))
return(2);
cur++;
while (ISA_ALPHA(cur) || ISA_DIGIT(cur) ||
(*cur == '+') || (*cur == '-') || (*cur == '.')) cur++;
if (uri != NULL) {
g_free(uri->scheme);
uri->scheme = g_strndup(*str, cur - *str);
}
*str = cur;
return(0);
}
/**
* rfc3986_parse_fragment:
* @uri: pointer to an URI structure
* @str: pointer to the string to analyze
*
* Parse the query part of an URI
*
* fragment = *( pchar / "/" / "?" )
* NOTE: the strict syntax as defined by 3986 does not allow '[' and ']'
* in the fragment identifier but this is used very broadly for
* xpointer scheme selection, so we are allowing it here to not break
* for example all the DocBook processing chains.
*
* Returns 0 or the error code
*/
static int
rfc3986_parse_fragment(URI *uri, const char **str)
{
const char *cur;
if (str == NULL)
return (-1);
cur = *str;
while ((ISA_PCHAR(cur)) || (*cur == '/') || (*cur == '?') ||
(*cur == '[') || (*cur == ']') ||
((uri != NULL) && (uri->cleanup & 1) && (IS_UNWISE(cur))))
NEXT(cur);
if (uri != NULL) {
g_free(uri->fragment);
if (uri->cleanup & 2)
uri->fragment = g_strndup(*str, cur - *str);
else
uri->fragment = uri_string_unescape(*str, cur - *str, NULL);
}
*str = cur;
return (0);
}
/**
* rfc3986_parse_query:
* @uri: pointer to an URI structure
* @str: pointer to the string to analyze
*
* Parse the query part of an URI
*
* query = *uric
*
* Returns 0 or the error code
*/
static int
rfc3986_parse_query(URI *uri, const char **str)
{
const char *cur;
if (str == NULL)
return (-1);
cur = *str;
while ((ISA_PCHAR(cur)) || (*cur == '/') || (*cur == '?') ||
((uri != NULL) && (uri->cleanup & 1) && (IS_UNWISE(cur))))
NEXT(cur);
if (uri != NULL) {
g_free(uri->query);
uri->query = g_strndup (*str, cur - *str);
}
*str = cur;
return (0);
}
/**
* rfc3986_parse_port:
* @uri: pointer to an URI structure
* @str: the string to analyze
*
* Parse a port part and fills in the appropriate fields
* of the @uri structure
*
* port = *DIGIT
*
* Returns 0 or the error code
*/
static int
rfc3986_parse_port(URI *uri, const char **str)
{
const char *cur = *str;
int port = 0;
if (ISA_DIGIT(cur)) {
while (ISA_DIGIT(cur)) {
port = port * 10 + (*cur - '0');
if (port > 65535) {
return 1;
}
cur++;
}
if (uri) {
uri->port = port;
}
*str = cur;
return 0;
}
return 1;
}
/**
* rfc3986_parse_user_info:
* @uri: pointer to an URI structure
* @str: the string to analyze
*
* Parse an user informations part and fills in the appropriate fields
* of the @uri structure
*
* userinfo = *( unreserved / pct-encoded / sub-delims / ":" )
*
* Returns 0 or the error code
*/
static int
rfc3986_parse_user_info(URI *uri, const char **str)
{
const char *cur;
cur = *str;
while (ISA_UNRESERVED(cur) || ISA_PCT_ENCODED(cur) ||
ISA_SUB_DELIM(cur) || (*cur == ':'))
NEXT(cur);
if (*cur == '@') {
if (uri != NULL) {
g_free(uri->user);
if (uri->cleanup & 2)
uri->user = g_strndup(*str, cur - *str);
else
uri->user = uri_string_unescape(*str, cur - *str, NULL);
}
*str = cur;
return(0);
}
return(1);
}
/**
* rfc3986_parse_dec_octet:
* @str: the string to analyze
*
* dec-octet = DIGIT ; 0-9
* / %x31-39 DIGIT ; 10-99
* / "1" 2DIGIT ; 100-199
* / "2" %x30-34 DIGIT ; 200-249
* / "25" %x30-35 ; 250-255
*
* Skip a dec-octet.
*
* Returns 0 if found and skipped, 1 otherwise
*/
static int
rfc3986_parse_dec_octet(const char **str) {
const char *cur = *str;
if (!(ISA_DIGIT(cur)))
return(1);
if (!ISA_DIGIT(cur+1))
cur++;
else if ((*cur != '0') && (ISA_DIGIT(cur + 1)) && (!ISA_DIGIT(cur+2)))
cur += 2;
else if ((*cur == '1') && (ISA_DIGIT(cur + 1)) && (ISA_DIGIT(cur + 2)))
cur += 3;
else if ((*cur == '2') && (*(cur + 1) >= '0') &&
(*(cur + 1) <= '4') && (ISA_DIGIT(cur + 2)))
cur += 3;
else if ((*cur == '2') && (*(cur + 1) == '5') &&
(*(cur + 2) >= '0') && (*(cur + 1) <= '5'))
cur += 3;
else
return(1);
*str = cur;
return(0);
}
/**
* rfc3986_parse_host:
* @uri: pointer to an URI structure
* @str: the string to analyze
*
* Parse an host part and fills in the appropriate fields
* of the @uri structure
*
* host = IP-literal / IPv4address / reg-name
* IP-literal = "[" ( IPv6address / IPvFuture ) "]"
* IPv4address = dec-octet "." dec-octet "." dec-octet "." dec-octet
* reg-name = *( unreserved / pct-encoded / sub-delims )
*
* Returns 0 or the error code
*/
static int
rfc3986_parse_host(URI *uri, const char **str)
{
const char *cur = *str;
const char *host;
host = cur;
/*
* IPv6 and future addressing scheme are enclosed between brackets
*/
if (*cur == '[') {
cur++;
while ((*cur != ']') && (*cur != 0))
cur++;
if (*cur != ']')
return(1);
cur++;
goto found;
}
/*
* try to parse an IPv4
*/
if (ISA_DIGIT(cur)) {
if (rfc3986_parse_dec_octet(&cur) != 0)
goto not_ipv4;
if (*cur != '.')
goto not_ipv4;
cur++;
if (rfc3986_parse_dec_octet(&cur) != 0)
goto not_ipv4;
if (*cur != '.')
goto not_ipv4;
if (rfc3986_parse_dec_octet(&cur) != 0)
goto not_ipv4;
if (*cur != '.')
goto not_ipv4;
if (rfc3986_parse_dec_octet(&cur) != 0)
goto not_ipv4;
goto found;
not_ipv4:
cur = *str;
}
/*
* then this should be a hostname which can be empty
*/
while (ISA_UNRESERVED(cur) || ISA_PCT_ENCODED(cur) || ISA_SUB_DELIM(cur))
NEXT(cur);
found:
if (uri != NULL) {
g_free(uri->authority);
uri->authority = NULL;
g_free(uri->server);
if (cur != host) {
if (uri->cleanup & 2)
uri->server = g_strndup(host, cur - host);
else
uri->server = uri_string_unescape(host, cur - host, NULL);
} else
uri->server = NULL;
}
*str = cur;
return(0);
}
/**
* rfc3986_parse_authority:
* @uri: pointer to an URI structure
* @str: the string to analyze
*
* Parse an authority part and fills in the appropriate fields
* of the @uri structure
*
* authority = [ userinfo "@" ] host [ ":" port ]
*
* Returns 0 or the error code
*/
static int
rfc3986_parse_authority(URI *uri, const char **str)
{
const char *cur;
int ret;
cur = *str;
/*
* try to parse an userinfo and check for the trailing @
*/
ret = rfc3986_parse_user_info(uri, &cur);
if ((ret != 0) || (*cur != '@'))
cur = *str;
else
cur++;
ret = rfc3986_parse_host(uri, &cur);
if (ret != 0) return(ret);
if (*cur == ':') {
cur++;
ret = rfc3986_parse_port(uri, &cur);
if (ret != 0) return(ret);
}
*str = cur;
return(0);
}
/**
* rfc3986_parse_segment:
* @str: the string to analyze
* @forbid: an optional forbidden character
* @empty: allow an empty segment
*
* Parse a segment and fills in the appropriate fields
* of the @uri structure
*
* segment = *pchar
* segment-nz = 1*pchar
* segment-nz-nc = 1*( unreserved / pct-encoded / sub-delims / "@" )
* ; non-zero-length segment without any colon ":"
*
* Returns 0 or the error code
*/
static int
rfc3986_parse_segment(const char **str, char forbid, int empty)
{
const char *cur;
cur = *str;
if (!ISA_PCHAR(cur)) {
if (empty)
return(0);
return(1);
}
while (ISA_PCHAR(cur) && (*cur != forbid))
NEXT(cur);
*str = cur;
return (0);
}
/**
* rfc3986_parse_path_ab_empty:
* @uri: pointer to an URI structure
* @str: the string to analyze
*
* Parse an path absolute or empty and fills in the appropriate fields
* of the @uri structure
*
* path-abempty = *( "/" segment )
*
* Returns 0 or the error code
*/
static int
rfc3986_parse_path_ab_empty(URI *uri, const char **str)
{
const char *cur;
int ret;
cur = *str;
while (*cur == '/') {
cur++;
ret = rfc3986_parse_segment(&cur, 0, 1);
if (ret != 0) return(ret);
}
if (uri != NULL) {
g_free(uri->path);
if (*str != cur) {
if (uri->cleanup & 2)
uri->path = g_strndup(*str, cur - *str);
else
uri->path = uri_string_unescape(*str, cur - *str, NULL);
} else {
uri->path = NULL;
}
}
*str = cur;
return (0);
}
/**
* rfc3986_parse_path_absolute:
* @uri: pointer to an URI structure
* @str: the string to analyze
*
* Parse an path absolute and fills in the appropriate fields
* of the @uri structure
*
* path-absolute = "/" [ segment-nz *( "/" segment ) ]
*
* Returns 0 or the error code
*/
static int
rfc3986_parse_path_absolute(URI *uri, const char **str)
{
const char *cur;
int ret;
cur = *str;
if (*cur != '/')
return(1);
cur++;
ret = rfc3986_parse_segment(&cur, 0, 0);
if (ret == 0) {
while (*cur == '/') {
cur++;
ret = rfc3986_parse_segment(&cur, 0, 1);
if (ret != 0) return(ret);
}
}
if (uri != NULL) {
g_free(uri->path);
if (cur != *str) {
if (uri->cleanup & 2)
uri->path = g_strndup(*str, cur - *str);
else
uri->path = uri_string_unescape(*str, cur - *str, NULL);
} else {
uri->path = NULL;
}
}
*str = cur;
return (0);
}
/**
* rfc3986_parse_path_rootless:
* @uri: pointer to an URI structure
* @str: the string to analyze
*
* Parse an path without root and fills in the appropriate fields
* of the @uri structure
*
* path-rootless = segment-nz *( "/" segment )
*
* Returns 0 or the error code
*/
static int
rfc3986_parse_path_rootless(URI *uri, const char **str)
{
const char *cur;
int ret;
cur = *str;
ret = rfc3986_parse_segment(&cur, 0, 0);
if (ret != 0) return(ret);
while (*cur == '/') {
cur++;
ret = rfc3986_parse_segment(&cur, 0, 1);
if (ret != 0) return(ret);
}
if (uri != NULL) {
g_free(uri->path);
if (cur != *str) {
if (uri->cleanup & 2)
uri->path = g_strndup(*str, cur - *str);
else
uri->path = uri_string_unescape(*str, cur - *str, NULL);
} else {
uri->path = NULL;
}
}
*str = cur;
return (0);
}
/**
* rfc3986_parse_path_no_scheme:
* @uri: pointer to an URI structure
* @str: the string to analyze
*
* Parse an path which is not a scheme and fills in the appropriate fields
* of the @uri structure
*
* path-noscheme = segment-nz-nc *( "/" segment )
*
* Returns 0 or the error code
*/
static int
rfc3986_parse_path_no_scheme(URI *uri, const char **str)
{
const char *cur;
int ret;
cur = *str;
ret = rfc3986_parse_segment(&cur, ':', 0);
if (ret != 0) return(ret);
while (*cur == '/') {
cur++;
ret = rfc3986_parse_segment(&cur, 0, 1);
if (ret != 0) return(ret);
}
if (uri != NULL) {
g_free(uri->path);
if (cur != *str) {
if (uri->cleanup & 2)
uri->path = g_strndup(*str, cur - *str);
else
uri->path = uri_string_unescape(*str, cur - *str, NULL);
} else {
uri->path = NULL;
}
}
*str = cur;
return (0);
}
/**
* rfc3986_parse_hier_part:
* @uri: pointer to an URI structure
* @str: the string to analyze
*
* Parse an hierarchical part and fills in the appropriate fields
* of the @uri structure
*
* hier-part = "//" authority path-abempty
* / path-absolute
* / path-rootless
* / path-empty
*
* Returns 0 or the error code
*/
static int
rfc3986_parse_hier_part(URI *uri, const char **str)
{
const char *cur;
int ret;
cur = *str;
if ((*cur == '/') && (*(cur + 1) == '/')) {
cur += 2;
ret = rfc3986_parse_authority(uri, &cur);
if (ret != 0) return(ret);
ret = rfc3986_parse_path_ab_empty(uri, &cur);
if (ret != 0) return(ret);
*str = cur;
return(0);
} else if (*cur == '/') {
ret = rfc3986_parse_path_absolute(uri, &cur);
if (ret != 0) return(ret);
} else if (ISA_PCHAR(cur)) {
ret = rfc3986_parse_path_rootless(uri, &cur);
if (ret != 0) return(ret);
} else {
/* path-empty is effectively empty */
if (uri != NULL) {
g_free(uri->path);
uri->path = NULL;
}
}
*str = cur;
return (0);
}
/**
* rfc3986_parse_relative_ref:
* @uri: pointer to an URI structure
* @str: the string to analyze
*
* Parse an URI string and fills in the appropriate fields
* of the @uri structure
*
* relative-ref = relative-part [ "?" query ] [ "#" fragment ]
* relative-part = "//" authority path-abempty
* / path-absolute
* / path-noscheme
* / path-empty
*
* Returns 0 or the error code
*/
static int
rfc3986_parse_relative_ref(URI *uri, const char *str) {
int ret;
if ((*str == '/') && (*(str + 1) == '/')) {
str += 2;
ret = rfc3986_parse_authority(uri, &str);
if (ret != 0) return(ret);
ret = rfc3986_parse_path_ab_empty(uri, &str);
if (ret != 0) return(ret);
} else if (*str == '/') {
ret = rfc3986_parse_path_absolute(uri, &str);
if (ret != 0) return(ret);
} else if (ISA_PCHAR(str)) {
ret = rfc3986_parse_path_no_scheme(uri, &str);
if (ret != 0) return(ret);
} else {
/* path-empty is effectively empty */
if (uri != NULL) {
g_free(uri->path);
uri->path = NULL;
}
}
if (*str == '?') {
str++;
ret = rfc3986_parse_query(uri, &str);
if (ret != 0) return(ret);
}
if (*str == '#') {
str++;
ret = rfc3986_parse_fragment(uri, &str);
if (ret != 0) return(ret);
}
if (*str != 0) {
uri_clean(uri);
return(1);
}
return(0);
}
/**
* rfc3986_parse:
* @uri: pointer to an URI structure
* @str: the string to analyze
*
* Parse an URI string and fills in the appropriate fields
* of the @uri structure
*
* scheme ":" hier-part [ "?" query ] [ "#" fragment ]
*
* Returns 0 or the error code
*/
static int
rfc3986_parse(URI *uri, const char *str) {
int ret;
ret = rfc3986_parse_scheme(uri, &str);
if (ret != 0) return(ret);
if (*str != ':') {
return(1);
}
str++;
ret = rfc3986_parse_hier_part(uri, &str);
if (ret != 0) return(ret);
if (*str == '?') {
str++;
ret = rfc3986_parse_query(uri, &str);
if (ret != 0) return(ret);
}
if (*str == '#') {
str++;
ret = rfc3986_parse_fragment(uri, &str);
if (ret != 0) return(ret);
}
if (*str != 0) {
uri_clean(uri);
return(1);
}
return(0);
}
/**
* rfc3986_parse_uri_reference:
* @uri: pointer to an URI structure
* @str: the string to analyze
*
* Parse an URI reference string and fills in the appropriate fields
* of the @uri structure
*
* URI-reference = URI / relative-ref
*
* Returns 0 or the error code
*/
static int
rfc3986_parse_uri_reference(URI *uri, const char *str) {
int ret;
if (str == NULL)
return(-1);
uri_clean(uri);
/*
* Try first to parse absolute refs, then fallback to relative if
* it fails.
*/
ret = rfc3986_parse(uri, str);
if (ret != 0) {
uri_clean(uri);
ret = rfc3986_parse_relative_ref(uri, str);
if (ret != 0) {
uri_clean(uri);
return(ret);
}
}
return(0);
}
/**
* uri_parse:
* @str: the URI string to analyze
*
* Parse an URI based on RFC 3986
*
* URI-reference = [ absoluteURI | relativeURI ] [ "#" fragment ]
*
* Returns a newly built URI or NULL in case of error
*/
URI *
uri_parse(const char *str) {
URI *uri;
int ret;
if (str == NULL)
return(NULL);
uri = uri_new();
ret = rfc3986_parse_uri_reference(uri, str);
if (ret) {
uri_free(uri);
return(NULL);
}
return(uri);
}
/**
* uri_parse_into:
* @uri: pointer to an URI structure
* @str: the string to analyze
*
* Parse an URI reference string based on RFC 3986 and fills in the
* appropriate fields of the @uri structure
*
* URI-reference = URI / relative-ref
*
* Returns 0 or the error code
*/
int
uri_parse_into(URI *uri, const char *str) {
return(rfc3986_parse_uri_reference(uri, str));
}
/**
* uri_parse_raw:
* @str: the URI string to analyze
* @raw: if 1 unescaping of URI pieces are disabled
*
* Parse an URI but allows to keep intact the original fragments.
*
* URI-reference = URI / relative-ref
*
* Returns a newly built URI or NULL in case of error
*/
URI *
uri_parse_raw(const char *str, int raw) {
URI *uri;
int ret;
if (str == NULL)
return(NULL);
uri = uri_new();
if (raw) {
uri->cleanup |= 2;
}
ret = uri_parse_into(uri, str);
if (ret) {
uri_free(uri);
return(NULL);
}
return(uri);
}
/************************************************************************
* *
* Generic URI structure functions *
* *
************************************************************************/
/**
* uri_new:
*
* Simply creates an empty URI
*
* Returns the new structure or NULL in case of error
*/
URI *
uri_new(void) {
URI *ret;
ret = g_new0(URI, 1);
return(ret);
}
/**
* realloc2n:
*
* Function to handle properly a reallocation when saving an URI
* Also imposes some limit on the length of an URI string output
*/
static char *
realloc2n(char *ret, int *max) {
char *temp;
int tmp;
tmp = *max * 2;
temp = g_realloc(ret, (tmp + 1));
*max = tmp;
return(temp);
}
/**
* uri_to_string:
* @uri: pointer to an URI
*
* Save the URI as an escaped string
*
* Returns a new string (to be deallocated by caller)
*/
char *
uri_to_string(URI *uri) {
char *ret = NULL;
char *temp;
const char *p;
int len;
int max;
if (uri == NULL) return(NULL);
max = 80;
ret = g_malloc(max + 1);
len = 0;
if (uri->scheme != NULL) {
p = uri->scheme;
while (*p != 0) {
if (len >= max) {
temp = realloc2n(ret, &max);
ret = temp;
}
ret[len++] = *p++;
}
if (len >= max) {
temp = realloc2n(ret, &max);
ret = temp;
}
ret[len++] = ':';
}
if (uri->opaque != NULL) {
p = uri->opaque;
while (*p != 0) {
if (len + 3 >= max) {
temp = realloc2n(ret, &max);
ret = temp;
}
if (IS_RESERVED(*(p)) || IS_UNRESERVED(*(p)))
ret[len++] = *p++;
else {
int val = *(unsigned char *)p++;
int hi = val / 0x10, lo = val % 0x10;
ret[len++] = '%';
ret[len++] = hi + (hi > 9? 'A'-10 : '0');
ret[len++] = lo + (lo > 9? 'A'-10 : '0');
}
}
} else {
if (uri->server != NULL) {
if (len + 3 >= max) {
temp = realloc2n(ret, &max);
ret = temp;
}
ret[len++] = '/';
ret[len++] = '/';
if (uri->user != NULL) {
p = uri->user;
while (*p != 0) {
if (len + 3 >= max) {
temp = realloc2n(ret, &max);
ret = temp;
}
if ((IS_UNRESERVED(*(p))) ||
((*(p) == ';')) || ((*(p) == ':')) ||
((*(p) == '&')) || ((*(p) == '=')) ||
((*(p) == '+')) || ((*(p) == '$')) ||
((*(p) == ',')))
ret[len++] = *p++;
else {
int val = *(unsigned char *)p++;
int hi = val / 0x10, lo = val % 0x10;
ret[len++] = '%';
ret[len++] = hi + (hi > 9? 'A'-10 : '0');
ret[len++] = lo + (lo > 9? 'A'-10 : '0');
}
}
if (len + 3 >= max) {
temp = realloc2n(ret, &max);
ret = temp;
}
ret[len++] = '@';
}
p = uri->server;
while (*p != 0) {
if (len >= max) {
temp = realloc2n(ret, &max);
ret = temp;
}
ret[len++] = *p++;
}
if (uri->port > 0) {
if (len + 10 >= max) {
temp = realloc2n(ret, &max);
ret = temp;
}
len += snprintf(&ret[len], max - len, ":%d", uri->port);
}
} else if (uri->authority != NULL) {
if (len + 3 >= max) {
temp = realloc2n(ret, &max);
ret = temp;
}
ret[len++] = '/';
ret[len++] = '/';
p = uri->authority;
while (*p != 0) {
if (len + 3 >= max) {
temp = realloc2n(ret, &max);
ret = temp;
}
if ((IS_UNRESERVED(*(p))) ||
((*(p) == '$')) || ((*(p) == ',')) || ((*(p) == ';')) ||
((*(p) == ':')) || ((*(p) == '@')) || ((*(p) == '&')) ||
((*(p) == '=')) || ((*(p) == '+')))
ret[len++] = *p++;
else {
int val = *(unsigned char *)p++;
int hi = val / 0x10, lo = val % 0x10;
ret[len++] = '%';
ret[len++] = hi + (hi > 9? 'A'-10 : '0');
ret[len++] = lo + (lo > 9? 'A'-10 : '0');
}
}
} else if (uri->scheme != NULL) {
if (len + 3 >= max) {
temp = realloc2n(ret, &max);
ret = temp;
}
ret[len++] = '/';
ret[len++] = '/';
}
if (uri->path != NULL) {
p = uri->path;
/*
* the colon in file:///d: should not be escaped or
* Windows accesses fail later.
*/
if ((uri->scheme != NULL) &&
(p[0] == '/') &&
(((p[1] >= 'a') && (p[1] <= 'z')) ||
((p[1] >= 'A') && (p[1] <= 'Z'))) &&
(p[2] == ':') &&
(!strcmp(uri->scheme, "file"))) {
if (len + 3 >= max) {
temp = realloc2n(ret, &max);
ret = temp;
}
ret[len++] = *p++;
ret[len++] = *p++;
ret[len++] = *p++;
}
while (*p != 0) {
if (len + 3 >= max) {
temp = realloc2n(ret, &max);
ret = temp;
}
if ((IS_UNRESERVED(*(p))) || ((*(p) == '/')) ||
((*(p) == ';')) || ((*(p) == '@')) || ((*(p) == '&')) ||
((*(p) == '=')) || ((*(p) == '+')) || ((*(p) == '$')) ||
((*(p) == ',')))
ret[len++] = *p++;
else {
int val = *(unsigned char *)p++;
int hi = val / 0x10, lo = val % 0x10;
ret[len++] = '%';
ret[len++] = hi + (hi > 9? 'A'-10 : '0');
ret[len++] = lo + (lo > 9? 'A'-10 : '0');
}
}
}
if (uri->query != NULL) {
if (len + 1 >= max) {
temp = realloc2n(ret, &max);
ret = temp;
}
ret[len++] = '?';
p = uri->query;
while (*p != 0) {
if (len + 1 >= max) {
temp = realloc2n(ret, &max);
ret = temp;
}
ret[len++] = *p++;
}
}
}
if (uri->fragment != NULL) {
if (len + 3 >= max) {
temp = realloc2n(ret, &max);
ret = temp;
}
ret[len++] = '#';
p = uri->fragment;
while (*p != 0) {
if (len + 3 >= max) {
temp = realloc2n(ret, &max);
ret = temp;
}
if ((IS_UNRESERVED(*(p))) || (IS_RESERVED(*(p))))
ret[len++] = *p++;
else {
int val = *(unsigned char *)p++;
int hi = val / 0x10, lo = val % 0x10;
ret[len++] = '%';
ret[len++] = hi + (hi > 9? 'A'-10 : '0');
ret[len++] = lo + (lo > 9? 'A'-10 : '0');
}
}
}
if (len >= max) {
temp = realloc2n(ret, &max);
ret = temp;
}
ret[len] = 0;
return(ret);
}
/**
* uri_clean:
* @uri: pointer to an URI
*
* Make sure the URI struct is free of content
*/
static void
uri_clean(URI *uri) {
if (uri == NULL) return;
g_free(uri->scheme);
uri->scheme = NULL;
g_free(uri->server);
uri->server = NULL;
g_free(uri->user);
uri->user = NULL;
g_free(uri->path);
uri->path = NULL;
g_free(uri->fragment);
uri->fragment = NULL;
g_free(uri->opaque);
uri->opaque = NULL;
g_free(uri->authority);
uri->authority = NULL;
g_free(uri->query);
uri->query = NULL;
}
/**
* uri_free:
* @uri: pointer to an URI
*
* Free up the URI struct
*/
void
uri_free(URI *uri) {
uri_clean(uri);
g_free(uri);
}
/************************************************************************
* *
* Helper functions *
* *
************************************************************************/
/**
* normalize_uri_path:
* @path: pointer to the path string
*
* Applies the 5 normalization steps to a path string--that is, RFC 2396
* Section 5.2, steps 6.c through 6.g.
*
* Normalization occurs directly on the string, no new allocation is done
*
* Returns 0 or an error code
*/
static int
normalize_uri_path(char *path) {
char *cur, *out;
if (path == NULL)
return(-1);
/* Skip all initial "/" chars. We want to get to the beginning of the
* first non-empty segment.
*/
cur = path;
while (cur[0] == '/')
++cur;
if (cur[0] == '\0')
return(0);
/* Keep everything we've seen so far. */
out = cur;
/*
* Analyze each segment in sequence for cases (c) and (d).
*/
while (cur[0] != '\0') {
/*
* c) All occurrences of "./", where "." is a complete path segment,
* are removed from the buffer string.
*/
if ((cur[0] == '.') && (cur[1] == '/')) {
cur += 2;
/* '//' normalization should be done at this point too */
while (cur[0] == '/')
cur++;
continue;
}
/*
* d) If the buffer string ends with "." as a complete path segment,
* that "." is removed.
*/
if ((cur[0] == '.') && (cur[1] == '\0'))
break;
/* Otherwise keep the segment. */
while (cur[0] != '/') {
if (cur[0] == '\0')
goto done_cd;
(out++)[0] = (cur++)[0];
}
/* nomalize // */
while ((cur[0] == '/') && (cur[1] == '/'))
cur++;
(out++)[0] = (cur++)[0];
}
done_cd:
out[0] = '\0';
/* Reset to the beginning of the first segment for the next sequence. */
cur = path;
while (cur[0] == '/')
++cur;
if (cur[0] == '\0')
return(0);
/*
* Analyze each segment in sequence for cases (e) and (f).
*
* e) All occurrences of "<segment>/../", where <segment> is a
* complete path segment not equal to "..", are removed from the
* buffer string. Removal of these path segments is performed
* iteratively, removing the leftmost matching pattern on each
* iteration, until no matching pattern remains.
*
* f) If the buffer string ends with "<segment>/..", where <segment>
* is a complete path segment not equal to "..", that
* "<segment>/.." is removed.
*
* To satisfy the "iterative" clause in (e), we need to collapse the
* string every time we find something that needs to be removed. Thus,
* we don't need to keep two pointers into the string: we only need a
* "current position" pointer.
*/
while (1) {
char *segp, *tmp;
/* At the beginning of each iteration of this loop, "cur" points to
* the first character of the segment we want to examine.
*/
/* Find the end of the current segment. */
segp = cur;
while ((segp[0] != '/') && (segp[0] != '\0'))
++segp;
/* If this is the last segment, we're done (we need at least two
* segments to meet the criteria for the (e) and (f) cases).
*/
if (segp[0] == '\0')
break;
/* If the first segment is "..", or if the next segment _isn't_ "..",
* keep this segment and try the next one.
*/
++segp;
if (((cur[0] == '.') && (cur[1] == '.') && (segp == cur+3))
|| ((segp[0] != '.') || (segp[1] != '.')
|| ((segp[2] != '/') && (segp[2] != '\0')))) {
cur = segp;
continue;
}
/* If we get here, remove this segment and the next one and back up
* to the previous segment (if there is one), to implement the
* "iteratively" clause. It's pretty much impossible to back up
* while maintaining two pointers into the buffer, so just compact
* the whole buffer now.
*/
/* If this is the end of the buffer, we're done. */
if (segp[2] == '\0') {
cur[0] = '\0';
break;
}
/* Valgrind complained, strcpy(cur, segp + 3); */
/* string will overlap, do not use strcpy */
tmp = cur;
segp += 3;
while ((*tmp++ = *segp++) != 0)
;
/* If there are no previous segments, then keep going from here. */
segp = cur;
while ((segp > path) && ((--segp)[0] == '/'))
;
if (segp == path)
continue;
/* "segp" is pointing to the end of a previous segment; find it's
* start. We need to back up to the previous segment and start
* over with that to handle things like "foo/bar/../..". If we
* don't do this, then on the first pass we'll remove the "bar/..",
* but be pointing at the second ".." so we won't realize we can also
* remove the "foo/..".
*/
cur = segp;
while ((cur > path) && (cur[-1] != '/'))
--cur;
}
out[0] = '\0';
/*
* g) If the resulting buffer string still begins with one or more
* complete path segments of "..", then the reference is
* considered to be in error. Implementations may handle this
* error by retaining these components in the resolved path (i.e.,
* treating them as part of the final URI), by removing them from
* the resolved path (i.e., discarding relative levels above the
* root), or by avoiding traversal of the reference.
*
* We discard them from the final path.
*/
if (path[0] == '/') {
cur = path;
while ((cur[0] == '/') && (cur[1] == '.') && (cur[2] == '.')
&& ((cur[3] == '/') || (cur[3] == '\0')))
cur += 3;
if (cur != path) {
out = path;
while (cur[0] != '\0')
(out++)[0] = (cur++)[0];
out[0] = 0;
}
}
return(0);
}
static int is_hex(char c) {
if (((c >= '0') && (c <= '9')) ||
((c >= 'a') && (c <= 'f')) ||
((c >= 'A') && (c <= 'F')))
return(1);
return(0);
}
/**
* uri_string_unescape:
* @str: the string to unescape
* @len: the length in bytes to unescape (or <= 0 to indicate full string)
* @target: optional destination buffer
*
* Unescaping routine, but does not check that the string is an URI. The
* output is a direct unsigned char translation of %XX values (no encoding)
* Note that the length of the result can only be smaller or same size as
* the input string.
*
* Returns a copy of the string, but unescaped, will return NULL only in case
* of error
*/
char *
uri_string_unescape(const char *str, int len, char *target) {
char *ret, *out;
const char *in;
if (str == NULL)
return(NULL);
if (len <= 0) len = strlen(str);
if (len < 0) return(NULL);
if (target == NULL) {
ret = g_malloc(len + 1);
} else
ret = target;
in = str;
out = ret;
while(len > 0) {
if ((len > 2) && (*in == '%') && (is_hex(in[1])) && (is_hex(in[2]))) {
in++;
if ((*in >= '0') && (*in <= '9'))
*out = (*in - '0');
else if ((*in >= 'a') && (*in <= 'f'))
*out = (*in - 'a') + 10;
else if ((*in >= 'A') && (*in <= 'F'))
*out = (*in - 'A') + 10;
in++;
if ((*in >= '0') && (*in <= '9'))
*out = *out * 16 + (*in - '0');
else if ((*in >= 'a') && (*in <= 'f'))
*out = *out * 16 + (*in - 'a') + 10;
else if ((*in >= 'A') && (*in <= 'F'))
*out = *out * 16 + (*in - 'A') + 10;
in++;
len -= 3;
out++;
} else {
*out++ = *in++;
len--;
}
}
*out = 0;
return(ret);
}
/**
* uri_string_escape:
* @str: string to escape
* @list: exception list string of chars not to escape
*
* This routine escapes a string to hex, ignoring reserved characters (a-z)
* and the characters in the exception list.
*
* Returns a new escaped string or NULL in case of error.
*/
char *
uri_string_escape(const char *str, const char *list) {
char *ret, ch;
char *temp;
const char *in;
int len, out;
if (str == NULL)
return(NULL);
if (str[0] == 0)
return(g_strdup(str));
len = strlen(str);
if (!(len > 0)) return(NULL);
len += 20;
ret = g_malloc(len);
in = str;
out = 0;
while(*in != 0) {
if (len - out <= 3) {
temp = realloc2n(ret, &len);
ret = temp;
}
ch = *in;
if ((ch != '@') && (!IS_UNRESERVED(ch)) && (!strchr(list, ch))) {
unsigned char val;
ret[out++] = '%';
val = ch >> 4;
if (val <= 9)
ret[out++] = '0' + val;
else
ret[out++] = 'A' + val - 0xA;
val = ch & 0xF;
if (val <= 9)
ret[out++] = '0' + val;
else
ret[out++] = 'A' + val - 0xA;
in++;
} else {
ret[out++] = *in++;
}
}
ret[out] = 0;
return(ret);
}
/************************************************************************
* *
* Public functions *
* *
************************************************************************/
/**
* uri_resolve:
* @URI: the URI instance found in the document
* @base: the base value
*
* Computes he final URI of the reference done by checking that
* the given URI is valid, and building the final URI using the
* base URI. This is processed according to section 5.2 of the
* RFC 2396
*
* 5.2. Resolving Relative References to Absolute Form
*
* Returns a new URI string (to be freed by the caller) or NULL in case
* of error.
*/
char *
uri_resolve(const char *uri, const char *base) {
char *val = NULL;
int ret, len, indx, cur, out;
URI *ref = NULL;
URI *bas = NULL;
URI *res = NULL;
/*
* 1) The URI reference is parsed into the potential four components and
* fragment identifier, as described in Section 4.3.
*
* NOTE that a completely empty URI is treated by modern browsers
* as a reference to "." rather than as a synonym for the current
* URI. Should we do that here?
*/
if (uri == NULL)
ret = -1;
else {
if (*uri) {
ref = uri_new();
ret = uri_parse_into(ref, uri);
}
else
ret = 0;
}
if (ret != 0)
goto done;
if ((ref != NULL) && (ref->scheme != NULL)) {
/*
* The URI is absolute don't modify.
*/
val = g_strdup(uri);
goto done;
}
if (base == NULL)
ret = -1;
else {
bas = uri_new();
ret = uri_parse_into(bas, base);
}
if (ret != 0) {
if (ref)
val = uri_to_string(ref);
goto done;
}
if (ref == NULL) {
/*
* the base fragment must be ignored
*/
g_free(bas->fragment);
bas->fragment = NULL;
val = uri_to_string(bas);
goto done;
}
/*
* 2) If the path component is empty and the scheme, authority, and
* query components are undefined, then it is a reference to the
* current document and we are done. Otherwise, the reference URI's
* query and fragment components are defined as found (or not found)
* within the URI reference and not inherited from the base URI.
*
* NOTE that in modern browsers, the parsing differs from the above
* in the following aspect: the query component is allowed to be
* defined while still treating this as a reference to the current
* document.
*/
res = uri_new();
if ((ref->scheme == NULL) && (ref->path == NULL) &&
((ref->authority == NULL) && (ref->server == NULL))) {
res->scheme = g_strdup(bas->scheme);
if (bas->authority != NULL)
res->authority = g_strdup(bas->authority);
else if (bas->server != NULL) {
res->server = g_strdup(bas->server);
res->user = g_strdup(bas->user);
res->port = bas->port;
}
res->path = g_strdup(bas->path);
if (ref->query != NULL) {
res->query = g_strdup (ref->query);
} else {
res->query = g_strdup(bas->query);
}
res->fragment = g_strdup(ref->fragment);
goto step_7;
}
/*
* 3) If the scheme component is defined, indicating that the reference
* starts with a scheme name, then the reference is interpreted as an
* absolute URI and we are done. Otherwise, the reference URI's
* scheme is inherited from the base URI's scheme component.
*/
if (ref->scheme != NULL) {
val = uri_to_string(ref);
goto done;
}
res->scheme = g_strdup(bas->scheme);
res->query = g_strdup(ref->query);
res->fragment = g_strdup(ref->fragment);
/*
* 4) If the authority component is defined, then the reference is a
* network-path and we skip to step 7. Otherwise, the reference
* URI's authority is inherited from the base URI's authority
* component, which will also be undefined if the URI scheme does not
* use an authority component.
*/
if ((ref->authority != NULL) || (ref->server != NULL)) {
if (ref->authority != NULL)
res->authority = g_strdup(ref->authority);
else {
res->server = g_strdup(ref->server);
res->user = g_strdup(ref->user);
res->port = ref->port;
}
res->path = g_strdup(ref->path);
goto step_7;
}
if (bas->authority != NULL)
res->authority = g_strdup(bas->authority);
else if (bas->server != NULL) {
res->server = g_strdup(bas->server);
res->user = g_strdup(bas->user);
res->port = bas->port;
}
/*
* 5) If the path component begins with a slash character ("/"), then
* the reference is an absolute-path and we skip to step 7.
*/
if ((ref->path != NULL) && (ref->path[0] == '/')) {
res->path = g_strdup(ref->path);
goto step_7;
}
/*
* 6) If this step is reached, then we are resolving a relative-path
* reference. The relative path needs to be merged with the base
* URI's path. Although there are many ways to do this, we will
* describe a simple method using a separate string buffer.
*
* Allocate a buffer large enough for the result string.
*/
len = 2; /* extra / and 0 */
if (ref->path != NULL)
len += strlen(ref->path);
if (bas->path != NULL)
len += strlen(bas->path);
res->path = g_malloc(len);
res->path[0] = 0;
/*
* a) All but the last segment of the base URI's path component is
* copied to the buffer. In other words, any characters after the
* last (right-most) slash character, if any, are excluded.
*/
cur = 0;
out = 0;
if (bas->path != NULL) {
while (bas->path[cur] != 0) {
while ((bas->path[cur] != 0) && (bas->path[cur] != '/'))
cur++;
if (bas->path[cur] == 0)
break;
cur++;
while (out < cur) {
res->path[out] = bas->path[out];
out++;
}
}
}
res->path[out] = 0;
/*
* b) The reference's path component is appended to the buffer
* string.
*/
if (ref->path != NULL && ref->path[0] != 0) {
indx = 0;
/*
* Ensure the path includes a '/'
*/
if ((out == 0) && (bas->server != NULL))
res->path[out++] = '/';
while (ref->path[indx] != 0) {
res->path[out++] = ref->path[indx++];
}
}
res->path[out] = 0;
/*
* Steps c) to h) are really path normalization steps
*/
normalize_uri_path(res->path);
step_7:
/*
* 7) The resulting URI components, including any inherited from the
* base URI, are recombined to give the absolute form of the URI
* reference.
*/
val = uri_to_string(res);
done:
if (ref != NULL)
uri_free(ref);
if (bas != NULL)
uri_free(bas);
if (res != NULL)
uri_free(res);
return(val);
}
/**
* uri_resolve_relative:
* @URI: the URI reference under consideration
* @base: the base value
*
* Expresses the URI of the reference in terms relative to the
* base. Some examples of this operation include:
* base = "http://site1.com/docs/book1.html"
* URI input URI returned
* docs/pic1.gif pic1.gif
* docs/img/pic1.gif img/pic1.gif
* img/pic1.gif ../img/pic1.gif
* http://site1.com/docs/pic1.gif pic1.gif
* http://site2.com/docs/pic1.gif http://site2.com/docs/pic1.gif
*
* base = "docs/book1.html"
* URI input URI returned
* docs/pic1.gif pic1.gif
* docs/img/pic1.gif img/pic1.gif
* img/pic1.gif ../img/pic1.gif
* http://site1.com/docs/pic1.gif http://site1.com/docs/pic1.gif
*
*
* Note: if the URI reference is really weird or complicated, it may be
* worthwhile to first convert it into a "nice" one by calling
* uri_resolve (using 'base') before calling this routine,
* since this routine (for reasonable efficiency) assumes URI has
* already been through some validation.
*
* Returns a new URI string (to be freed by the caller) or NULL in case
* error.
*/
char *
uri_resolve_relative (const char *uri, const char * base)
{
char *val = NULL;
int ret;
int ix;
int pos = 0;
int nbslash = 0;
int len;
URI *ref = NULL;
URI *bas = NULL;
char *bptr, *uptr, *vptr;
int remove_path = 0;
if ((uri == NULL) || (*uri == 0))
return NULL;
/*
* First parse URI into a standard form
*/
ref = uri_new ();
/* If URI not already in "relative" form */
if (uri[0] != '.') {
ret = uri_parse_into (ref, uri);
if (ret != 0)
goto done; /* Error in URI, return NULL */
} else
ref->path = g_strdup(uri);
/*
* Next parse base into the same standard form
*/
if ((base == NULL) || (*base == 0)) {
val = g_strdup (uri);
goto done;
}
bas = uri_new ();
if (base[0] != '.') {
ret = uri_parse_into (bas, base);
if (ret != 0)
goto done; /* Error in base, return NULL */
} else
bas->path = g_strdup(base);
/*
* If the scheme / server on the URI differs from the base,
* just return the URI
*/
if ((ref->scheme != NULL) &&
((bas->scheme == NULL) ||
(strcmp (bas->scheme, ref->scheme)) ||
(strcmp (bas->server, ref->server)))) {
val = g_strdup (uri);
goto done;
}
if (bas->path == ref->path ||
(bas->path && ref->path && !strcmp(bas->path, ref->path))) {
val = g_strdup("");
goto done;
}
if (bas->path == NULL) {
val = g_strdup(ref->path);
goto done;
}
if (ref->path == NULL) {
ref->path = (char *) "/";
remove_path = 1;
}
/*
* At this point (at last!) we can compare the two paths
*
* First we take care of the special case where either of the
* two path components may be missing (bug 316224)
*/
if (bas->path == NULL) {
if (ref->path != NULL) {
uptr = ref->path;
if (*uptr == '/')
uptr++;
/* exception characters from uri_to_string */
val = uri_string_escape(uptr, "/;&=+$,");
}
goto done;
}
bptr = bas->path;
if (ref->path == NULL) {
for (ix = 0; bptr[ix] != 0; ix++) {
if (bptr[ix] == '/')
nbslash++;
}
uptr = NULL;
len = 1; /* this is for a string terminator only */
} else {
/*
* Next we compare the two strings and find where they first differ
*/
if ((ref->path[pos] == '.') && (ref->path[pos+1] == '/'))
pos += 2;
if ((*bptr == '.') && (bptr[1] == '/'))
bptr += 2;
else if ((*bptr == '/') && (ref->path[pos] != '/'))
bptr++;
while ((bptr[pos] == ref->path[pos]) && (bptr[pos] != 0))
pos++;
if (bptr[pos] == ref->path[pos]) {
val = g_strdup("");
goto done; /* (I can't imagine why anyone would do this) */
}
/*
* In URI, "back up" to the last '/' encountered. This will be the
* beginning of the "unique" suffix of URI
*/
ix = pos;
if ((ref->path[ix] == '/') && (ix > 0))
ix--;
else if ((ref->path[ix] == 0) && (ix > 1) && (ref->path[ix - 1] == '/'))
ix -= 2;
for (; ix > 0; ix--) {
if (ref->path[ix] == '/')
break;
}
if (ix == 0) {
uptr = ref->path;
} else {
ix++;
uptr = &ref->path[ix];
}
/*
* In base, count the number of '/' from the differing point
*/
if (bptr[pos] != ref->path[pos]) {/* check for trivial URI == base */
for (; bptr[ix] != 0; ix++) {
if (bptr[ix] == '/')
nbslash++;
}
}
len = strlen (uptr) + 1;
}
if (nbslash == 0) {
if (uptr != NULL)
/* exception characters from uri_to_string */
val = uri_string_escape(uptr, "/;&=+$,");
goto done;
}
/*
* Allocate just enough space for the returned string -
* length of the remainder of the URI, plus enough space
* for the "../" groups, plus one for the terminator
*/
val = g_malloc (len + 3 * nbslash);
vptr = val;
/*
* Put in as many "../" as needed
*/
for (; nbslash>0; nbslash--) {
*vptr++ = '.';
*vptr++ = '.';
*vptr++ = '/';
}
/*
* Finish up with the end of the URI
*/
if (uptr != NULL) {
if ((vptr > val) && (len > 0) &&
(uptr[0] == '/') && (vptr[-1] == '/')) {
memcpy (vptr, uptr + 1, len - 1);
vptr[len - 2] = 0;
} else {
memcpy (vptr, uptr, len);
vptr[len - 1] = 0;
}
} else {
vptr[len - 1] = 0;
}
/* escape the freshly-built path */
vptr = val;
/* exception characters from uri_to_string */
val = uri_string_escape(vptr, "/;&=+$,");
g_free(vptr);
done:
/*
* Free the working variables
*/
if (remove_path != 0)
ref->path = NULL;
if (ref != NULL)
uri_free (ref);
if (bas != NULL)
uri_free (bas);
return val;
}
/*
* Utility functions to help parse and assemble query strings.
*/
struct QueryParams *
query_params_new (int init_alloc)
{
struct QueryParams *ps;
if (init_alloc <= 0) init_alloc = 1;
ps = g_new(QueryParams, 1);
ps->n = 0;
ps->alloc = init_alloc;
ps->p = g_new(QueryParam, ps->alloc);
return ps;
}
/* Ensure there is space to store at least one more parameter
* at the end of the set.
*/
static int
query_params_append (struct QueryParams *ps,
const char *name, const char *value)
{
if (ps->n >= ps->alloc) {
ps->p = g_renew(QueryParam, ps->p, ps->alloc * 2);
ps->alloc *= 2;
}
ps->p[ps->n].name = g_strdup(name);
ps->p[ps->n].value = g_strdup(value);
ps->p[ps->n].ignore = 0;
ps->n++;
return 0;
}
void
query_params_free (struct QueryParams *ps)
{
int i;
for (i = 0; i < ps->n; ++i) {
g_free (ps->p[i].name);
g_free (ps->p[i].value);
}
g_free (ps->p);
g_free (ps);
}
struct QueryParams *
query_params_parse (const char *query)
{
struct QueryParams *ps;
const char *end, *eq;
ps = query_params_new (0);
if (!query || query[0] == '\0') return ps;
while (*query) {
char *name = NULL, *value = NULL;
/* Find the next separator, or end of the string. */
end = strchr (query, '&');
if (!end)
end = strchr (query, ';');
if (!end)
end = query + strlen (query);
/* Find the first '=' character between here and end. */
eq = strchr (query, '=');
if (eq && eq >= end) eq = NULL;
/* Empty section (eg. "&&"). */
if (end == query)
goto next;
/* If there is no '=' character, then we have just "name"
* and consistent with CGI.pm we assume value is "".
*/
else if (!eq) {
name = uri_string_unescape (query, end - query, NULL);
value = NULL;
}
/* Or if we have "name=" here (works around annoying
* problem when calling uri_string_unescape with len = 0).
*/
else if (eq+1 == end) {
name = uri_string_unescape (query, eq - query, NULL);
value = g_new0(char, 1);
}
/* If the '=' character is at the beginning then we have
* "=value" and consistent with CGI.pm we _ignore_ this.
*/
else if (query == eq)
goto next;
/* Otherwise it's "name=value". */
else {
name = uri_string_unescape (query, eq - query, NULL);
value = uri_string_unescape (eq+1, end - (eq+1), NULL);
}
/* Append to the parameter set. */
query_params_append (ps, name, value);
g_free(name);
g_free(value);
next:
query = end;
if (*query) query ++; /* skip '&' separator */
}
return ps;
}
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