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freeswitch/libs/apr-util/uri/apr_uri.c
Michael Jerris 3b35430557 add apr-util 1.2.8 to in tree libs 
git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@3734 d0543943-73ff-0310-b7d9-9358b9ac24b2
2006-12-19 20:04:21 +00:00

463 lines
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/* Copyright 2000-2005 The Apache Software Foundation or its licensors, as
* applicable.
*
* Licensed 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.
*/
/*
* apr_uri.c: URI related utility things
*
*/
#include <stdlib.h>
#include "apu.h"
#include "apr.h"
#include "apr_general.h"
#include "apr_strings.h"
#define APR_WANT_STRFUNC
#include "apr_want.h"
#include "apr_uri.h"
typedef struct schemes_t schemes_t;
/** Structure to store various schemes and their default ports */
struct schemes_t {
/** The name of the scheme */
const char *name;
/** The default port for the scheme */
apr_port_t default_port;
};
/* Some WWW schemes and their default ports; this is basically /etc/services */
/* This will become global when the protocol abstraction comes */
/* As the schemes are searched by a linear search, */
/* they are sorted by their expected frequency */
static schemes_t schemes[] =
{
{"http", APR_URI_HTTP_DEFAULT_PORT},
{"ftp", APR_URI_FTP_DEFAULT_PORT},
{"https", APR_URI_HTTPS_DEFAULT_PORT},
{"gopher", APR_URI_GOPHER_DEFAULT_PORT},
{"ldap", APR_URI_LDAP_DEFAULT_PORT},
{"nntp", APR_URI_NNTP_DEFAULT_PORT},
{"snews", APR_URI_SNEWS_DEFAULT_PORT},
{"imap", APR_URI_IMAP_DEFAULT_PORT},
{"pop", APR_URI_POP_DEFAULT_PORT},
{"sip", APR_URI_SIP_DEFAULT_PORT},
{"rtsp", APR_URI_RTSP_DEFAULT_PORT},
{"wais", APR_URI_WAIS_DEFAULT_PORT},
{"z39.50r", APR_URI_WAIS_DEFAULT_PORT},
{"z39.50s", APR_URI_WAIS_DEFAULT_PORT},
{"prospero", APR_URI_PROSPERO_DEFAULT_PORT},
{"nfs", APR_URI_NFS_DEFAULT_PORT},
{"tip", APR_URI_TIP_DEFAULT_PORT},
{"acap", APR_URI_ACAP_DEFAULT_PORT},
{"telnet", APR_URI_TELNET_DEFAULT_PORT},
{"ssh", APR_URI_SSH_DEFAULT_PORT},
{ NULL, 0xFFFF } /* unknown port */
};
APU_DECLARE(apr_port_t) apr_uri_port_of_scheme(const char *scheme_str)
{
schemes_t *scheme;
if (scheme_str) {
for (scheme = schemes; scheme->name != NULL; ++scheme) {
if (strcasecmp(scheme_str, scheme->name) == 0) {
return scheme->default_port;
}
}
}
return 0;
}
/* Unparse a apr_uri_t structure to an URI string.
* Optionally suppress the password for security reasons.
*/
APU_DECLARE(char *) apr_uri_unparse(apr_pool_t *p,
const apr_uri_t *uptr,
unsigned flags)
{
char *ret = "";
/* If suppressing the site part, omit both user name & scheme://hostname */
if (!(flags & APR_URI_UNP_OMITSITEPART)) {
/* Construct a "user:password@" string, honoring the passed
* APR_URI_UNP_ flags: */
if (uptr->user || uptr->password) {
ret = apr_pstrcat(p,
(uptr->user && !(flags & APR_URI_UNP_OMITUSER))
? uptr->user : "",
(uptr->password && !(flags & APR_URI_UNP_OMITPASSWORD))
? ":" : "",
(uptr->password && !(flags & APR_URI_UNP_OMITPASSWORD))
? ((flags & APR_URI_UNP_REVEALPASSWORD)
? uptr->password : "XXXXXXXX")
: "",
((uptr->user && !(flags & APR_URI_UNP_OMITUSER)) ||
(uptr->password && !(flags & APR_URI_UNP_OMITPASSWORD)))
? "@" : "",
NULL);
}
/* Construct scheme://site string */
if (uptr->hostname) {
int is_default_port;
const char *lbrk = "", *rbrk = "";
if (strchr(uptr->hostname, ':')) { /* v6 literal */
lbrk = "[";
rbrk = "]";
}
is_default_port =
(uptr->port_str == NULL ||
uptr->port == 0 ||
uptr->port == apr_uri_port_of_scheme(uptr->scheme));
if (uptr->scheme) {
ret = apr_pstrcat(p,
uptr->scheme, "://", ret,
lbrk, uptr->hostname, rbrk,
is_default_port ? "" : ":",
is_default_port ? "" : uptr->port_str,
NULL);
}
else {
/* A violation of RFC2396, but it is clear from section 3.2
* that the : belongs above to the scheme, while // belongs
* to the authority, so include the authority prefix while
* omitting the "scheme:" that the user neglected to pass us.
*/
ret = apr_pstrcat(p,
"//", ret, lbrk, uptr->hostname, rbrk,
is_default_port ? "" : ":",
is_default_port ? "" : uptr->port_str,
NULL);
}
}
}
/* Should we suppress all path info? */
if (!(flags & APR_URI_UNP_OMITPATHINFO)) {
/* Append path, query and fragment strings: */
ret = apr_pstrcat(p,
ret,
(uptr->path)
? uptr->path : "",
(uptr->query && !(flags & APR_URI_UNP_OMITQUERY))
? "?" : "",
(uptr->query && !(flags & APR_URI_UNP_OMITQUERY))
? uptr->query : "",
(uptr->fragment && !(flags & APR_URI_UNP_OMITQUERY))
? "#" : NULL,
(uptr->fragment && !(flags & APR_URI_UNP_OMITQUERY))
? uptr->fragment : NULL,
NULL);
}
return ret;
}
/* Here is the hand-optimized parse_uri_components(). There are some wild
* tricks we could pull in assembly language that we don't pull here... like we
* can do word-at-time scans for delimiter characters using the same technique
* that fast memchr()s use. But that would be way non-portable. -djg
*/
/* We have a apr_table_t that we can index by character and it tells us if the
* character is one of the interesting delimiters. Note that we even get
* compares for NUL for free -- it's just another delimiter.
*/
#define T_COLON 0x01 /* ':' */
#define T_SLASH 0x02 /* '/' */
#define T_QUESTION 0x04 /* '?' */
#define T_HASH 0x08 /* '#' */
#define T_NUL 0x80 /* '\0' */
#if APR_CHARSET_EBCDIC
/* Delimiter table for the EBCDIC character set */
static const unsigned char uri_delims[256] = {
T_NUL,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,T_SLASH,0,0,0,0,0,0,0,0,0,0,0,0,0,T_QUESTION,
0,0,0,0,0,0,0,0,0,0,T_COLON,T_HASH,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
};
#else
/* Delimiter table for the ASCII character set */
static const unsigned char uri_delims[256] = {
T_NUL,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,T_HASH,0,0,0,0,0,0,0,0,0,0,0,T_SLASH,
0,0,0,0,0,0,0,0,0,0,T_COLON,0,0,0,0,T_QUESTION,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
};
#endif
/* it works like this:
if (uri_delims[ch] & NOTEND_foobar) {
then we're not at a delimiter for foobar
}
*/
/* Note that we optimize the scheme scanning here, we cheat and let the
* compiler know that it doesn't have to do the & masking.
*/
#define NOTEND_SCHEME (0xff)
#define NOTEND_HOSTINFO (T_SLASH | T_QUESTION | T_HASH | T_NUL)
#define NOTEND_PATH (T_QUESTION | T_HASH | T_NUL)
/* parse_uri_components():
* Parse a given URI, fill in all supplied fields of a uri_components
* structure. This eliminates the necessity of extracting host, port,
* path, query info repeatedly in the modules.
* Side effects:
* - fills in fields of uri_components *uptr
* - none on any of the r->* fields
*/
APU_DECLARE(apr_status_t) apr_uri_parse(apr_pool_t *p, const char *uri,
apr_uri_t *uptr)
{
const char *s;
const char *s1;
const char *hostinfo;
char *endstr;
int port;
int v6_offset1 = 0, v6_offset2 = 0;
/* Initialize the structure. parse_uri() and parse_uri_components()
* can be called more than once per request.
*/
memset (uptr, '\0', sizeof(*uptr));
uptr->is_initialized = 1;
/* We assume the processor has a branch predictor like most --
* it assumes forward branches are untaken and backwards are taken. That's
* the reason for the gotos. -djg
*/
if (uri[0] == '/') {
/* RFC2396 #4.3 says that two leading slashes mean we have an
* authority component, not a path! Fixing this looks scary
* with the gotos here. But if the existing logic is valid,
* then presumably a goto pointing to deal_with_authority works.
*
* RFC2396 describes this as resolving an ambiguity. In the
* case of three or more slashes there would seem to be no
* ambiguity, so it is a path after all.
*/
if (uri[1] == '/' && uri[2] != '/') {
s = uri + 2 ;
goto deal_with_authority ;
}
deal_with_path:
/* we expect uri to point to first character of path ... remember
* that the path could be empty -- http://foobar?query for example
*/
s = uri;
while ((uri_delims[*(unsigned char *)s] & NOTEND_PATH) == 0) {
++s;
}
if (s != uri) {
uptr->path = apr_pstrmemdup(p, uri, s - uri);
}
if (*s == 0) {
return APR_SUCCESS;
}
if (*s == '?') {
++s;
s1 = strchr(s, '#');
if (s1) {
uptr->fragment = apr_pstrdup(p, s1 + 1);
uptr->query = apr_pstrmemdup(p, s, s1 - s);
}
else {
uptr->query = apr_pstrdup(p, s);
}
return APR_SUCCESS;
}
/* otherwise it's a fragment */
uptr->fragment = apr_pstrdup(p, s + 1);
return APR_SUCCESS;
}
/* find the scheme: */
s = uri;
while ((uri_delims[*(unsigned char *)s] & NOTEND_SCHEME) == 0) {
++s;
}
/* scheme must be non-empty and followed by :// */
if (s == uri || s[0] != ':' || s[1] != '/' || s[2] != '/') {
goto deal_with_path; /* backwards predicted taken! */
}
uptr->scheme = apr_pstrmemdup(p, uri, s - uri);
s += 3;
deal_with_authority:
hostinfo = s;
while ((uri_delims[*(unsigned char *)s] & NOTEND_HOSTINFO) == 0) {
++s;
}
uri = s; /* whatever follows hostinfo is start of uri */
uptr->hostinfo = apr_pstrmemdup(p, hostinfo, uri - hostinfo);
/* If there's a username:password@host:port, the @ we want is the last @...
* too bad there's no memrchr()... For the C purists, note that hostinfo
* is definately not the first character of the original uri so therefore
* &hostinfo[-1] < &hostinfo[0] ... and this loop is valid C.
*/
do {
--s;
} while (s >= hostinfo && *s != '@');
if (s < hostinfo) {
/* again we want the common case to be fall through */
deal_with_host:
/* We expect hostinfo to point to the first character of
* the hostname. If there's a port it is the first colon,
* except with IPv6.
*/
if (*hostinfo == '[') {
v6_offset1 = 1;
v6_offset2 = 2;
s = memchr(hostinfo, ']', uri - hostinfo);
if (s == NULL) {
return APR_EGENERAL;
}
if (*++s != ':') {
s = NULL; /* no port */
}
}
else {
s = memchr(hostinfo, ':', uri - hostinfo);
}
if (s == NULL) {
/* we expect the common case to have no port */
uptr->hostname = apr_pstrmemdup(p,
hostinfo + v6_offset1,
uri - hostinfo - v6_offset2);
goto deal_with_path;
}
uptr->hostname = apr_pstrmemdup(p,
hostinfo + v6_offset1,
s - hostinfo - v6_offset2);
++s;
uptr->port_str = apr_pstrmemdup(p, s, uri - s);
if (uri != s) {
port = strtol(uptr->port_str, &endstr, 10);
uptr->port = port;
if (*endstr == '\0') {
goto deal_with_path;
}
/* Invalid characters after ':' found */
return APR_EGENERAL;
}
uptr->port = apr_uri_port_of_scheme(uptr->scheme);
goto deal_with_path;
}
/* first colon delimits username:password */
s1 = memchr(hostinfo, ':', s - hostinfo);
if (s1) {
uptr->user = apr_pstrmemdup(p, hostinfo, s1 - hostinfo);
++s1;
uptr->password = apr_pstrmemdup(p, s1, s - s1);
}
else {
uptr->user = apr_pstrmemdup(p, hostinfo, s - hostinfo);
}
hostinfo = s + 1;
goto deal_with_host;
}
/* Special case for CONNECT parsing: it comes with the hostinfo part only */
/* See the INTERNET-DRAFT document "Tunneling SSL Through a WWW Proxy"
* currently at http://www.mcom.com/newsref/std/tunneling_ssl.html
* for the format of the "CONNECT host:port HTTP/1.0" request
*/
APU_DECLARE(apr_status_t) apr_uri_parse_hostinfo(apr_pool_t *p,
const char *hostinfo,
apr_uri_t *uptr)
{
const char *s;
char *endstr;
const char *rsb;
int v6_offset1 = 0;
/* Initialize the structure. parse_uri() and parse_uri_components()
* can be called more than once per request.
*/
memset(uptr, '\0', sizeof(*uptr));
uptr->is_initialized = 1;
uptr->hostinfo = apr_pstrdup(p, hostinfo);
/* We expect hostinfo to point to the first character of
* the hostname. There must be a port, separated by a colon
*/
if (*hostinfo == '[') {
if ((rsb = strchr(hostinfo, ']')) == NULL ||
*(rsb + 1) != ':') {
return APR_EGENERAL;
}
/* literal IPv6 address */
s = rsb + 1;
++hostinfo;
v6_offset1 = 1;
}
else {
s = strchr(hostinfo, ':');
}
if (s == NULL) {
return APR_EGENERAL;
}
uptr->hostname = apr_pstrndup(p, hostinfo, s - hostinfo - v6_offset1);
++s;
uptr->port_str = apr_pstrdup(p, s);
if (*s != '\0') {
uptr->port = (unsigned short) strtol(uptr->port_str, &endstr, 10);
if (*endstr == '\0') {
return APR_SUCCESS;
}
/* Invalid characters after ':' found */
}
return APR_EGENERAL;
}
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