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b4d86d34f9
curl/lib/urlapi.c
Daniel Stenberg 032e838b73
terminology: call them null-terminated strings 
Updated terminology in docs, comments and phrases to refer to C strings
as "null-terminated". Done to unify with how most other C oriented docs
refer of them and what users in general seem to prefer (based on a
single highly unscientific poll on twitter).

Reported-by: coinhubs on github
Fixes #5598
Closes #5608
2020-06-28 00:31:24 +02:00

1493 lines
39 KiB
C
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
#include "curl_setup.h"
#include "urldata.h"
#include "urlapi-int.h"
#include "strcase.h"
#include "dotdot.h"
#include "url.h"
#include "escape.h"
#include "curl_ctype.h"
#include "inet_pton.h"
/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"
/* MSDOS/Windows style drive prefix, eg c: in c:foo */
#define STARTS_WITH_DRIVE_PREFIX(str) \
((('a' <= str[0] && str[0] <= 'z') || \
('A' <= str[0] && str[0] <= 'Z')) && \
(str[1] == ':'))
/* MSDOS/Windows style drive prefix, optionally with
* a '|' instead of ':', followed by a slash or NUL */
#define STARTS_WITH_URL_DRIVE_PREFIX(str) \
((('a' <= (str)[0] && (str)[0] <= 'z') || \
('A' <= (str)[0] && (str)[0] <= 'Z')) && \
((str)[1] == ':' || (str)[1] == '|') && \
((str)[2] == '/' || (str)[2] == '\\' || (str)[2] == 0))
/* Internal representation of CURLU. Point to URL-encoded strings. */
struct Curl_URL {
char *scheme;
char *user;
char *password;
char *options; /* IMAP only? */
char *host;
char *zoneid; /* for numerical IPv6 addresses */
char *port;
char *path;
char *query;
char *fragment;
char *scratch; /* temporary scratch area */
char *temppath; /* temporary path pointer */
long portnum; /* the numerical version */
};
#define DEFAULT_SCHEME "https"
static void free_urlhandle(struct Curl_URL *u)
{
free(u->scheme);
free(u->user);
free(u->password);
free(u->options);
free(u->host);
free(u->zoneid);
free(u->port);
free(u->path);
free(u->query);
free(u->fragment);
free(u->scratch);
free(u->temppath);
}
/* move the full contents of one handle onto another and
free the original */
static void mv_urlhandle(struct Curl_URL *from,
struct Curl_URL *to)
{
free_urlhandle(to);
*to = *from;
free(from);
}
/*
* Find the separator at the end of the host name, or the '?' in cases like
* http://www.url.com?id=2380
*/
static const char *find_host_sep(const char *url)
{
const char *sep;
const char *query;
/* Find the start of the hostname */
sep = strstr(url, "//");
if(!sep)
sep = url;
else
sep += 2;
query = strchr(sep, '?');
sep = strchr(sep, '/');
if(!sep)
sep = url + strlen(url);
if(!query)
query = url + strlen(url);
return sep < query ? sep : query;
}
/*
* Decide in an encoding-independent manner whether a character in an
* URL must be escaped. The same criterion must be used in strlen_url()
* and strcpy_url().
*/
static bool urlchar_needs_escaping(int c)
{
return !(ISCNTRL(c) || ISSPACE(c) || ISGRAPH(c));
}
/*
* strlen_url() returns the length of the given URL if the spaces within the
* URL were properly URL encoded.
* URL encoding should be skipped for host names, otherwise IDN resolution
* will fail.
*/
static size_t strlen_url(const char *url, bool relative)
{
const unsigned char *ptr;
size_t newlen = 0;
bool left = TRUE; /* left side of the ? */
const unsigned char *host_sep = (const unsigned char *) url;
if(!relative)
host_sep = (const unsigned char *) find_host_sep(url);
for(ptr = (unsigned char *)url; *ptr; ptr++) {
if(ptr < host_sep) {
++newlen;
continue;
}
switch(*ptr) {
case '?':
left = FALSE;
/* FALLTHROUGH */
default:
if(urlchar_needs_escaping(*ptr))
newlen += 2;
newlen++;
break;
case ' ':
if(left)
newlen += 3;
else
newlen++;
break;
}
}
return newlen;
}
/* strcpy_url() copies a url to a output buffer and URL-encodes the spaces in
* the source URL accordingly.
* URL encoding should be skipped for host names, otherwise IDN resolution
* will fail.
*/
static void strcpy_url(char *output, const char *url, bool relative)
{
/* we must add this with whitespace-replacing */
bool left = TRUE;
const unsigned char *iptr;
char *optr = output;
const unsigned char *host_sep = (const unsigned char *) url;
if(!relative)
host_sep = (const unsigned char *) find_host_sep(url);
for(iptr = (unsigned char *)url; /* read from here */
*iptr; /* until zero byte */
iptr++) {
if(iptr < host_sep) {
*optr++ = *iptr;
continue;
}
switch(*iptr) {
case '?':
left = FALSE;
/* FALLTHROUGH */
default:
if(urlchar_needs_escaping(*iptr)) {
msnprintf(optr, 4, "%%%02x", *iptr);
optr += 3;
}
else
*optr++=*iptr;
break;
case ' ':
if(left) {
*optr++='%'; /* add a '%' */
*optr++='2'; /* add a '2' */
*optr++='0'; /* add a '0' */
}
else
*optr++='+'; /* add a '+' here */
break;
}
}
*optr = 0; /* null-terminate output buffer */
}
/*
* Returns true if the given URL is absolute (as opposed to relative) within
* the buffer size. Returns the scheme in the buffer if TRUE and 'buf' is
* non-NULL.
*/
bool Curl_is_absolute_url(const char *url, char *buf, size_t buflen)
{
size_t i;
#ifdef WIN32
if(STARTS_WITH_DRIVE_PREFIX(url))
return FALSE;
#endif
for(i = 0; i < buflen && url[i]; ++i) {
char s = url[i];
if((s == ':') && (url[i + 1] == '/')) {
if(buf)
buf[i] = 0;
return TRUE;
}
/* RFC 3986 3.1 explains:
scheme = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
*/
else if(ISALNUM(s) || (s == '+') || (s == '-') || (s == '.') ) {
if(buf)
buf[i] = (char)TOLOWER(s);
}
else
break;
}
return FALSE;
}
/*
* Concatenate a relative URL to a base URL making it absolute.
* URL-encodes any spaces.
* The returned pointer must be freed by the caller unless NULL
* (returns NULL on out of memory).
*/
static char *concat_url(const char *base, const char *relurl)
{
/***
TRY to append this new path to the old URL
to the right of the host part. Oh crap, this is doomed to cause
problems in the future...
*/
char *newest;
char *protsep;
char *pathsep;
size_t newlen;
bool host_changed = FALSE;
const char *useurl = relurl;
size_t urllen;
/* we must make our own copy of the URL to play with, as it may
point to read-only data */
char *url_clone = strdup(base);
if(!url_clone)
return NULL; /* skip out of this NOW */
/* protsep points to the start of the host name */
protsep = strstr(url_clone, "//");
if(!protsep)
protsep = url_clone;
else
protsep += 2; /* pass the slashes */
if('/' != relurl[0]) {
int level = 0;
/* First we need to find out if there's a ?-letter in the URL,
and cut it and the right-side of that off */
pathsep = strchr(protsep, '?');
if(pathsep)
*pathsep = 0;
/* we have a relative path to append to the last slash if there's one
available, or if the new URL is just a query string (starts with a
'?') we append the new one at the end of the entire currently worked
out URL */
if(useurl[0] != '?') {
pathsep = strrchr(protsep, '/');
if(pathsep)
*pathsep = 0;
}
/* Check if there's any slash after the host name, and if so, remember
that position instead */
pathsep = strchr(protsep, '/');
if(pathsep)
protsep = pathsep + 1;
else
protsep = NULL;
/* now deal with one "./" or any amount of "../" in the newurl
and act accordingly */
if((useurl[0] == '.') && (useurl[1] == '/'))
useurl += 2; /* just skip the "./" */
while((useurl[0] == '.') &&
(useurl[1] == '.') &&
(useurl[2] == '/')) {
level++;
useurl += 3; /* pass the "../" */
}
if(protsep) {
while(level--) {
/* cut off one more level from the right of the original URL */
pathsep = strrchr(protsep, '/');
if(pathsep)
*pathsep = 0;
else {
*protsep = 0;
break;
}
}
}
}
else {
/* We got a new absolute path for this server */
if(relurl[1] == '/') {
/* the new URL starts with //, just keep the protocol part from the
original one */
*protsep = 0;
useurl = &relurl[2]; /* we keep the slashes from the original, so we
skip the new ones */
host_changed = TRUE;
}
else {
/* cut off the original URL from the first slash, or deal with URLs
without slash */
pathsep = strchr(protsep, '/');
if(pathsep) {
/* When people use badly formatted URLs, such as
"http://www.url.com?dir=/home/daniel" we must not use the first
slash, if there's a ?-letter before it! */
char *sep = strchr(protsep, '?');
if(sep && (sep < pathsep))
pathsep = sep;
*pathsep = 0;
}
else {
/* There was no slash. Now, since we might be operating on a badly
formatted URL, such as "http://www.url.com?id=2380" which doesn't
use a slash separator as it is supposed to, we need to check for a
?-letter as well! */
pathsep = strchr(protsep, '?');
if(pathsep)
*pathsep = 0;
}
}
}
/* If the new part contains a space, this is a mighty stupid redirect
but we still make an effort to do "right". To the left of a '?'
letter we replace each space with %20 while it is replaced with '+'
on the right side of the '?' letter.
*/
newlen = strlen_url(useurl, !host_changed);
urllen = strlen(url_clone);
newest = malloc(urllen + 1 + /* possible slash */
newlen + 1 /* zero byte */);
if(!newest) {
free(url_clone); /* don't leak this */
return NULL;
}
/* copy over the root url part */
memcpy(newest, url_clone, urllen);
/* check if we need to append a slash */
if(('/' == useurl[0]) || (protsep && !*protsep) || ('?' == useurl[0]))
;
else
newest[urllen++]='/';
/* then append the new piece on the right side */
strcpy_url(&newest[urllen], useurl, !host_changed);
free(url_clone);
return newest;
}
/*
* parse_hostname_login()
*
* Parse the login details (user name, password and options) from the URL and
* strip them out of the host name
*
*/
static CURLUcode parse_hostname_login(struct Curl_URL *u,
char **hostname,
unsigned int flags)
{
CURLUcode result = CURLUE_OK;
CURLcode ccode;
char *userp = NULL;
char *passwdp = NULL;
char *optionsp = NULL;
const struct Curl_handler *h = NULL;
/* At this point, we're hoping all the other special cases have
* been taken care of, so conn->host.name is at most
* [user[:password][;options]]@]hostname
*
* We need somewhere to put the embedded details, so do that first.
*/
char *ptr = strchr(*hostname, '@');
char *login = *hostname;
if(!ptr)
goto out;
/* We will now try to extract the
* possible login information in a string like:
* ftp://user:password@ftp.my.site:8021/README */
*hostname = ++ptr;
/* if this is a known scheme, get some details */
if(u->scheme)
h = Curl_builtin_scheme(u->scheme);
/* We could use the login information in the URL so extract it. Only parse
options if the handler says we should. Note that 'h' might be NULL! */
ccode = Curl_parse_login_details(login, ptr - login - 1,
&userp, &passwdp,
(h && (h->flags & PROTOPT_URLOPTIONS)) ?
&optionsp:NULL);
if(ccode) {
result = CURLUE_MALFORMED_INPUT;
goto out;
}
if(userp) {
if(flags & CURLU_DISALLOW_USER) {
/* Option DISALLOW_USER is set and url contains username. */
result = CURLUE_USER_NOT_ALLOWED;
goto out;
}
u->user = userp;
}
if(passwdp)
u->password = passwdp;
if(optionsp)
u->options = optionsp;
return CURLUE_OK;
out:
free(userp);
free(passwdp);
free(optionsp);
return result;
}
UNITTEST CURLUcode Curl_parse_port(struct Curl_URL *u, char *hostname)
{
char *portptr = NULL;
char endbracket;
int len;
/*
* Find the end of an IPv6 address, either on the ']' ending bracket or
* a percent-encoded zone index.
*/
if(1 == sscanf(hostname, "[%*45[0123456789abcdefABCDEF:.]%c%n",
&endbracket, &len)) {
if(']' == endbracket)
portptr = &hostname[len];
else if('%' == endbracket) {
int zonelen = len;
if(1 == sscanf(hostname + zonelen, "%*[^]]%c%n", &endbracket, &len)) {
if(']' != endbracket)
return CURLUE_MALFORMED_INPUT;
portptr = &hostname[--zonelen + len + 1];
}
else
return CURLUE_MALFORMED_INPUT;
}
else
return CURLUE_MALFORMED_INPUT;
/* this is a RFC2732-style specified IP-address */
if(portptr && *portptr) {
if(*portptr != ':')
return CURLUE_MALFORMED_INPUT;
}
else
portptr = NULL;
}
else
portptr = strchr(hostname, ':');
if(portptr) {
char *rest;
long port;
char portbuf[7];
/* Browser behavior adaptation. If there's a colon with no digits after,
just cut off the name there which makes us ignore the colon and just
use the default port. Firefox, Chrome and Safari all do that. */
if(!portptr[1]) {
*portptr = '\0';
return CURLUE_OK;
}
if(!ISDIGIT(portptr[1]))
return CURLUE_BAD_PORT_NUMBER;
port = strtol(portptr + 1, &rest, 10); /* Port number must be decimal */
if((port <= 0) || (port > 0xffff))
/* Single unix standard says port numbers are 16 bits long, but we don't
treat port zero as OK. */
return CURLUE_BAD_PORT_NUMBER;
if(rest[0])
return CURLUE_BAD_PORT_NUMBER;
*portptr++ = '\0'; /* cut off the name there */
*rest = 0;
/* generate a new port number string to get rid of leading zeroes etc */
msnprintf(portbuf, sizeof(portbuf), "%ld", port);
u->portnum = port;
u->port = strdup(portbuf);
if(!u->port)
return CURLUE_OUT_OF_MEMORY;
}
return CURLUE_OK;
}
/* scan for byte values < 31 or 127 */
static CURLUcode junkscan(const char *part)
{
if(part) {
static const char badbytes[]={
/* */ 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
0x7f,
0x00 /* null-terminate */
};
size_t n = strlen(part);
size_t nfine = strcspn(part, badbytes);
if(nfine != n)
/* since we don't know which part is scanned, return a generic error
code */
return CURLUE_MALFORMED_INPUT;
}
return CURLUE_OK;
}
static CURLUcode hostname_check(struct Curl_URL *u, char *hostname)
{
size_t len;
size_t hlen = strlen(hostname);
if(hostname[0] == '[') {
#ifdef ENABLE_IPV6
char dest[16]; /* fits a binary IPv6 address */
#endif
const char *l = "0123456789abcdefABCDEF:.";
if(hlen < 4) /* '[::]' is the shortest possible valid string */
return CURLUE_MALFORMED_INPUT;
hostname++;
hlen -= 2;
if(hostname[hlen] != ']')
return CURLUE_MALFORMED_INPUT;
/* only valid letters are ok */
len = strspn(hostname, l);
if(hlen != len) {
hlen = len;
if(hostname[len] == '%') {
/* this could now be '%[zone id]' */
char zoneid[16];
int i = 0;
char *h = &hostname[len + 1];
/* pass '25' if present and is a url encoded percent sign */
if(!strncmp(h, "25", 2) && h[2] && (h[2] != ']'))
h += 2;
while(*h && (*h != ']') && (i < 15))
zoneid[i++] = *h++;
if(!i || (']' != *h))
return CURLUE_MALFORMED_INPUT;
zoneid[i] = 0;
u->zoneid = strdup(zoneid);
if(!u->zoneid)
return CURLUE_OUT_OF_MEMORY;
hostname[len] = ']'; /* insert end bracket */
hostname[len + 1] = 0; /* terminate the hostname */
}
else
return CURLUE_MALFORMED_INPUT;
/* hostname is fine */
}
#ifdef ENABLE_IPV6
hostname[hlen] = 0; /* end the address there */
if(1 != Curl_inet_pton(AF_INET6, hostname, dest))
return CURLUE_MALFORMED_INPUT;
hostname[hlen] = ']'; /* restore ending bracket */
#endif
}
else {
/* letters from the second string is not ok */
len = strcspn(hostname, " ");
if(hlen != len)
/* hostname with bad content */
return CURLUE_MALFORMED_INPUT;
}
if(!hostname[0])
return CURLUE_NO_HOST;
return CURLUE_OK;
}
#define HOSTNAME_END(x) (((x) == '/') || ((x) == '?') || ((x) == '#'))
static CURLUcode seturl(const char *url, CURLU *u, unsigned int flags)
{
char *path;
bool path_alloced = FALSE;
char *hostname;
char *query = NULL;
char *fragment = NULL;
CURLUcode result;
bool url_has_scheme = FALSE;
char schemebuf[MAX_SCHEME_LEN + 1];
const char *schemep = NULL;
size_t schemelen = 0;
size_t urllen;
if(!url)
return CURLUE_MALFORMED_INPUT;
/*************************************************************
* Parse the URL.
************************************************************/
/* allocate scratch area */
urllen = strlen(url);
if(urllen > CURL_MAX_INPUT_LENGTH)
/* excessive input length */
return CURLUE_MALFORMED_INPUT;
path = u->scratch = malloc(urllen * 2 + 2);
if(!path)
return CURLUE_OUT_OF_MEMORY;
hostname = &path[urllen + 1];
hostname[0] = 0;
if(Curl_is_absolute_url(url, schemebuf, sizeof(schemebuf))) {
url_has_scheme = TRUE;
schemelen = strlen(schemebuf);
}
/* handle the file: scheme */
if(url_has_scheme && strcasecompare(schemebuf, "file")) {
/* path has been allocated large enough to hold this */
strcpy(path, &url[5]);
hostname = NULL; /* no host for file: URLs */
u->scheme = strdup("file");
if(!u->scheme)
return CURLUE_OUT_OF_MEMORY;
/* Extra handling URLs with an authority component (i.e. that start with
* "file://")
*
* We allow omitted hostname (e.g. file:/<path>) -- valid according to
* RFC 8089, but not the (current) WHAT-WG URL spec.
*/
if(path[0] == '/' && path[1] == '/') {
/* swallow the two slashes */
char *ptr = &path[2];
/*
* According to RFC 8089, a file: URL can be reliably dereferenced if:
*
* o it has no/blank hostname, or
*
* o the hostname matches "localhost" (case-insensitively), or
*
* o the hostname is a FQDN that resolves to this machine.
*
* For brevity, we only consider URLs with empty, "localhost", or
* "127.0.0.1" hostnames as local.
*
* Additionally, there is an exception for URLs with a Windows drive
* letter in the authority (which was accidentally omitted from RFC 8089
* Appendix E, but believe me, it was meant to be there. --MK)
*/
if(ptr[0] != '/' && !STARTS_WITH_URL_DRIVE_PREFIX(ptr)) {
/* the URL includes a host name, it must match "localhost" or
"127.0.0.1" to be valid */
if(!checkprefix("localhost/", ptr) &&
!checkprefix("127.0.0.1/", ptr)) {
/* Invalid file://hostname/, expected localhost or 127.0.0.1 or
none */
return CURLUE_MALFORMED_INPUT;
}
ptr += 9; /* now points to the slash after the host */
}
path = ptr;
}
#if !defined(MSDOS) && !defined(WIN32) && !defined(__CYGWIN__)
/* Don't allow Windows drive letters when not in Windows.
* This catches both "file:/c:" and "file:c:" */
if(('/' == path[0] && STARTS_WITH_URL_DRIVE_PREFIX(&path[1])) ||
STARTS_WITH_URL_DRIVE_PREFIX(path)) {
/* File drive letters are only accepted in MSDOS/Windows */
return CURLUE_MALFORMED_INPUT;
}
#else
/* If the path starts with a slash and a drive letter, ditch the slash */
if('/' == path[0] && STARTS_WITH_URL_DRIVE_PREFIX(&path[1])) {
/* This cannot be done with strcpy, as the memory chunks overlap! */
memmove(path, &path[1], strlen(&path[1]) + 1);
}
#endif
}
else {
/* clear path */
const char *p;
const char *hostp;
size_t len;
path[0] = 0;
if(url_has_scheme) {
int i = 0;
p = &url[schemelen + 1];
while(p && (*p == '/') && (i < 4)) {
p++;
i++;
}
if((i < 1) || (i>3))
/* less than one or more than three slashes */
return CURLUE_MALFORMED_INPUT;
schemep = schemebuf;
if(!Curl_builtin_scheme(schemep) &&
!(flags & CURLU_NON_SUPPORT_SCHEME))
return CURLUE_UNSUPPORTED_SCHEME;
if(junkscan(schemep))
return CURLUE_MALFORMED_INPUT;
}
else {
/* no scheme! */
if(!(flags & (CURLU_DEFAULT_SCHEME|CURLU_GUESS_SCHEME)))
return CURLUE_MALFORMED_INPUT;
if(flags & CURLU_DEFAULT_SCHEME)
schemep = DEFAULT_SCHEME;
/*
* The URL was badly formatted, let's try without scheme specified.
*/
p = url;
}
hostp = p; /* host name starts here */
while(*p && !HOSTNAME_END(*p)) /* find end of host name */
p++;
len = p - hostp;
if(len) {
memcpy(hostname, hostp, len);
hostname[len] = 0;
}
else {
if(!(flags & CURLU_NO_AUTHORITY))
return CURLUE_MALFORMED_INPUT;
}
len = strlen(p);
memcpy(path, p, len);
path[len] = 0;
if(schemep) {
u->scheme = strdup(schemep);
if(!u->scheme)
return CURLUE_OUT_OF_MEMORY;
}
}
if(junkscan(path))
return CURLUE_MALFORMED_INPUT;
if((flags & CURLU_URLENCODE) && path[0]) {
/* worst case output length is 3x the original! */
char *newp = malloc(strlen(path) * 3);
if(!newp)
return CURLUE_OUT_OF_MEMORY;
path_alloced = TRUE;
strcpy_url(newp, path, TRUE); /* consider it relative */
u->temppath = path = newp;
}
fragment = strchr(path, '#');
if(fragment) {
*fragment++ = 0;
if(fragment[0]) {
u->fragment = strdup(fragment);
if(!u->fragment)
return CURLUE_OUT_OF_MEMORY;
}
}
query = strchr(path, '?');
if(query) {
*query++ = 0;
/* done even if the query part is a blank string */
u->query = strdup(query);
if(!u->query)
return CURLUE_OUT_OF_MEMORY;
}
if(!path[0])
/* if there's no path left set, unset */
path = NULL;
else {
if(!(flags & CURLU_PATH_AS_IS)) {
/* remove ../ and ./ sequences according to RFC3986 */
char *newp = Curl_dedotdotify(path);
if(!newp)
return CURLUE_OUT_OF_MEMORY;
if(strcmp(newp, path)) {
/* if we got a new version */
if(path_alloced)
Curl_safefree(u->temppath);
u->temppath = path = newp;
path_alloced = TRUE;
}
else
free(newp);
}
u->path = path_alloced?path:strdup(path);
if(!u->path)
return CURLUE_OUT_OF_MEMORY;
u->temppath = NULL; /* used now */
}
if(hostname) {
/*
* Parse the login details and strip them out of the host name.
*/
if(junkscan(hostname))
return CURLUE_MALFORMED_INPUT;
result = parse_hostname_login(u, &hostname, flags);
if(result)
return result;
result = Curl_parse_port(u, hostname);
if(result)
return result;
if(0 == strlen(hostname) && (flags & CURLU_NO_AUTHORITY)) {
/* Skip hostname check, it's allowed to be empty. */
}
else {
result = hostname_check(u, hostname);
if(result)
return result;
}
u->host = strdup(hostname);
if(!u->host)
return CURLUE_OUT_OF_MEMORY;
if((flags & CURLU_GUESS_SCHEME) && !schemep) {
/* legacy curl-style guess based on host name */
if(checkprefix("ftp.", hostname))
schemep = "ftp";
else if(checkprefix("dict.", hostname))
schemep = "dict";
else if(checkprefix("ldap.", hostname))
schemep = "ldap";
else if(checkprefix("imap.", hostname))
schemep = "imap";
else if(checkprefix("smtp.", hostname))
schemep = "smtp";
else if(checkprefix("pop3.", hostname))
schemep = "pop3";
else
schemep = "http";
u->scheme = strdup(schemep);
if(!u->scheme)
return CURLUE_OUT_OF_MEMORY;
}
}
Curl_safefree(u->scratch);
Curl_safefree(u->temppath);
return CURLUE_OK;
}
/*
* Parse the URL and set the relevant members of the Curl_URL struct.
*/
static CURLUcode parseurl(const char *url, CURLU *u, unsigned int flags)
{
CURLUcode result = seturl(url, u, flags);
if(result) {
free_urlhandle(u);
memset(u, 0, sizeof(struct Curl_URL));
}
return result;
}
/*
*/
CURLU *curl_url(void)
{
return calloc(sizeof(struct Curl_URL), 1);
}
void curl_url_cleanup(CURLU *u)
{
if(u) {
free_urlhandle(u);
free(u);
}
}
#define DUP(dest, src, name) \
if(src->name) { \
dest->name = strdup(src->name); \
if(!dest->name) \
goto fail; \
}
CURLU *curl_url_dup(CURLU *in)
{
struct Curl_URL *u = calloc(sizeof(struct Curl_URL), 1);
if(u) {
DUP(u, in, scheme);
DUP(u, in, user);
DUP(u, in, password);
DUP(u, in, options);
DUP(u, in, host);
DUP(u, in, port);
DUP(u, in, path);
DUP(u, in, query);
DUP(u, in, fragment);
u->portnum = in->portnum;
}
return u;
fail:
curl_url_cleanup(u);
return NULL;
}
CURLUcode curl_url_get(CURLU *u, CURLUPart what,
char **part, unsigned int flags)
{
char *ptr;
CURLUcode ifmissing = CURLUE_UNKNOWN_PART;
char portbuf[7];
bool urldecode = (flags & CURLU_URLDECODE)?1:0;
bool plusdecode = FALSE;
(void)flags;
if(!u)
return CURLUE_BAD_HANDLE;
if(!part)
return CURLUE_BAD_PARTPOINTER;
*part = NULL;
switch(what) {
case CURLUPART_SCHEME:
ptr = u->scheme;
ifmissing = CURLUE_NO_SCHEME;
urldecode = FALSE; /* never for schemes */
break;
case CURLUPART_USER:
ptr = u->user;
ifmissing = CURLUE_NO_USER;
break;
case CURLUPART_PASSWORD:
ptr = u->password;
ifmissing = CURLUE_NO_PASSWORD;
break;
case CURLUPART_OPTIONS:
ptr = u->options;
ifmissing = CURLUE_NO_OPTIONS;
break;
case CURLUPART_HOST:
ptr = u->host;
ifmissing = CURLUE_NO_HOST;
break;
case CURLUPART_ZONEID:
ptr = u->zoneid;
break;
case CURLUPART_PORT:
ptr = u->port;
ifmissing = CURLUE_NO_PORT;
urldecode = FALSE; /* never for port */
if(!ptr && (flags & CURLU_DEFAULT_PORT) && u->scheme) {
/* there's no stored port number, but asked to deliver
a default one for the scheme */
const struct Curl_handler *h =
Curl_builtin_scheme(u->scheme);
if(h) {
msnprintf(portbuf, sizeof(portbuf), "%ld", h->defport);
ptr = portbuf;
}
}
else if(ptr && u->scheme) {
/* there is a stored port number, but ask to inhibit if
it matches the default one for the scheme */
const struct Curl_handler *h =
Curl_builtin_scheme(u->scheme);
if(h && (h->defport == u->portnum) &&
(flags & CURLU_NO_DEFAULT_PORT))
ptr = NULL;
}
break;
case CURLUPART_PATH:
ptr = u->path;
if(!ptr) {
ptr = u->path = strdup("/");
if(!u->path)
return CURLUE_OUT_OF_MEMORY;
}
break;
case CURLUPART_QUERY:
ptr = u->query;
ifmissing = CURLUE_NO_QUERY;
plusdecode = urldecode;
break;
case CURLUPART_FRAGMENT:
ptr = u->fragment;
ifmissing = CURLUE_NO_FRAGMENT;
break;
case CURLUPART_URL: {
char *url;
char *scheme;
char *options = u->options;
char *port = u->port;
char *allochost = NULL;
if(u->scheme && strcasecompare("file", u->scheme)) {
url = aprintf("file://%s%s%s",
u->path,
u->fragment? "#": "",
u->fragment? u->fragment : "");
}
else if(!u->host)
return CURLUE_NO_HOST;
else {
const struct Curl_handler *h = NULL;
if(u->scheme)
scheme = u->scheme;
else if(flags & CURLU_DEFAULT_SCHEME)
scheme = (char *) DEFAULT_SCHEME;
else
return CURLUE_NO_SCHEME;
h = Curl_builtin_scheme(scheme);
if(!port && (flags & CURLU_DEFAULT_PORT)) {
/* there's no stored port number, but asked to deliver
a default one for the scheme */
if(h) {
msnprintf(portbuf, sizeof(portbuf), "%ld", h->defport);
port = portbuf;
}
}
else if(port) {
/* there is a stored port number, but asked to inhibit if it matches
the default one for the scheme */
if(h && (h->defport == u->portnum) &&
(flags & CURLU_NO_DEFAULT_PORT))
port = NULL;
}
if(h && !(h->flags & PROTOPT_URLOPTIONS))
options = NULL;
if((u->host[0] == '[') && u->zoneid) {
/* make it '[ host %25 zoneid ]' */
size_t hostlen = strlen(u->host);
size_t alen = hostlen + 3 + strlen(u->zoneid) + 1;
allochost = malloc(alen);
if(!allochost)
return CURLUE_OUT_OF_MEMORY;
memcpy(allochost, u->host, hostlen - 1);
msnprintf(&allochost[hostlen - 1], alen - hostlen + 1,
"%%25%s]", u->zoneid);
}
url = aprintf("%s://%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
scheme,
u->user ? u->user : "",
u->password ? ":": "",
u->password ? u->password : "",
options ? ";" : "",
options ? options : "",
(u->user || u->password || options) ? "@": "",
allochost ? allochost : u->host,
port ? ":": "",
port ? port : "",
(u->path && (u->path[0] != '/')) ? "/": "",
u->path ? u->path : "/",
(u->query && u->query[0]) ? "?": "",
(u->query && u->query[0]) ? u->query : "",
u->fragment? "#": "",
u->fragment? u->fragment : "");
free(allochost);
}
if(!url)
return CURLUE_OUT_OF_MEMORY;
*part = url;
return CURLUE_OK;
}
default:
ptr = NULL;
break;
}
if(ptr) {
*part = strdup(ptr);
if(!*part)
return CURLUE_OUT_OF_MEMORY;
if(plusdecode) {
/* convert + to space */
char *plus;
for(plus = *part; *plus; ++plus) {
if(*plus == '+')
*plus = ' ';
}
}
if(urldecode) {
char *decoded;
size_t dlen;
/* this unconditional rejection of control bytes is documented
API behavior */
CURLcode res = Curl_urldecode(NULL, *part, 0, &decoded, &dlen,
REJECT_CTRL);
free(*part);
if(res) {
*part = NULL;
return CURLUE_URLDECODE;
}
*part = decoded;
}
return CURLUE_OK;
}
else
return ifmissing;
}
CURLUcode curl_url_set(CURLU *u, CURLUPart what,
const char *part, unsigned int flags)
{
char **storep = NULL;
long port = 0;
bool urlencode = (flags & CURLU_URLENCODE)? 1 : 0;
bool plusencode = FALSE;
bool urlskipslash = FALSE;
bool appendquery = FALSE;
bool equalsencode = FALSE;
if(!u)
return CURLUE_BAD_HANDLE;
if(!part) {
/* setting a part to NULL clears it */
switch(what) {
case CURLUPART_URL:
break;
case CURLUPART_SCHEME:
storep = &u->scheme;
break;
case CURLUPART_USER:
storep = &u->user;
break;
case CURLUPART_PASSWORD:
storep = &u->password;
break;
case CURLUPART_OPTIONS:
storep = &u->options;
break;
case CURLUPART_HOST:
storep = &u->host;
break;
case CURLUPART_ZONEID:
storep = &u->zoneid;
break;
case CURLUPART_PORT:
u->portnum = 0;
storep = &u->port;
break;
case CURLUPART_PATH:
storep = &u->path;
break;
case CURLUPART_QUERY:
storep = &u->query;
break;
case CURLUPART_FRAGMENT:
storep = &u->fragment;
break;
default:
return CURLUE_UNKNOWN_PART;
}
if(storep && *storep) {
free(*storep);
*storep = NULL;
}
return CURLUE_OK;
}
switch(what) {
case CURLUPART_SCHEME:
if(strlen(part) > MAX_SCHEME_LEN)
/* too long */
return CURLUE_MALFORMED_INPUT;
if(!(flags & CURLU_NON_SUPPORT_SCHEME) &&
/* verify that it is a fine scheme */
!Curl_builtin_scheme(part))
return CURLUE_UNSUPPORTED_SCHEME;
storep = &u->scheme;
urlencode = FALSE; /* never */
break;
case CURLUPART_USER:
storep = &u->user;
break;
case CURLUPART_PASSWORD:
storep = &u->password;
break;
case CURLUPART_OPTIONS:
storep = &u->options;
break;
case CURLUPART_HOST:
storep = &u->host;
free(u->zoneid);
u->zoneid = NULL;
break;
case CURLUPART_ZONEID:
storep = &u->zoneid;
break;
case CURLUPART_PORT:
{
char *endp;
urlencode = FALSE; /* never */
port = strtol(part, &endp, 10); /* Port number must be decimal */
if((port <= 0) || (port > 0xffff))
return CURLUE_BAD_PORT_NUMBER;
if(*endp)
/* weirdly provided number, not good! */
return CURLUE_MALFORMED_INPUT;
storep = &u->port;
}
break;
case CURLUPART_PATH:
urlskipslash = TRUE;
storep = &u->path;
break;
case CURLUPART_QUERY:
plusencode = urlencode;
appendquery = (flags & CURLU_APPENDQUERY)?1:0;
equalsencode = appendquery;
storep = &u->query;
break;
case CURLUPART_FRAGMENT:
storep = &u->fragment;
break;
case CURLUPART_URL: {
/*
* Allow a new URL to replace the existing (if any) contents.
*
* If the existing contents is enough for a URL, allow a relative URL to
* replace it.
*/
CURLUcode result;
char *oldurl;
char *redired_url;
CURLU *handle2;
if(Curl_is_absolute_url(part, NULL, MAX_SCHEME_LEN + 1)) {
handle2 = curl_url();
if(!handle2)
return CURLUE_OUT_OF_MEMORY;
result = parseurl(part, handle2, flags);
if(!result)
mv_urlhandle(handle2, u);
else
curl_url_cleanup(handle2);
return result;
}
/* extract the full "old" URL to do the redirect on */
result = curl_url_get(u, CURLUPART_URL, &oldurl, flags);
if(result) {
/* couldn't get the old URL, just use the new! */
handle2 = curl_url();
if(!handle2)
return CURLUE_OUT_OF_MEMORY;
result = parseurl(part, handle2, flags);
if(!result)
mv_urlhandle(handle2, u);
else
curl_url_cleanup(handle2);
return result;
}
/* apply the relative part to create a new URL */
redired_url = concat_url(oldurl, part);
free(oldurl);
if(!redired_url)
return CURLUE_OUT_OF_MEMORY;
/* now parse the new URL */
handle2 = curl_url();
if(!handle2) {
free(redired_url);
return CURLUE_OUT_OF_MEMORY;
}
result = parseurl(redired_url, handle2, flags);
free(redired_url);
if(!result)
mv_urlhandle(handle2, u);
else
curl_url_cleanup(handle2);
return result;
}
default:
return CURLUE_UNKNOWN_PART;
}
DEBUGASSERT(storep);
{
const char *newp = part;
size_t nalloc = strlen(part);
if(nalloc > CURL_MAX_INPUT_LENGTH)
/* excessive input length */
return CURLUE_MALFORMED_INPUT;
if(urlencode) {
const unsigned char *i;
char *o;
bool free_part = FALSE;
char *enc = malloc(nalloc * 3 + 1); /* for worst case! */
if(!enc)
return CURLUE_OUT_OF_MEMORY;
if(plusencode) {
/* space to plus */
i = (const unsigned char *)part;
for(o = enc; *i; ++o, ++i)
*o = (*i == ' ') ? '+' : *i;
*o = 0; /* null-terminate */
part = strdup(enc);
if(!part) {
free(enc);
return CURLUE_OUT_OF_MEMORY;
}
free_part = TRUE;
}
for(i = (const unsigned char *)part, o = enc; *i; i++) {
if(Curl_isunreserved(*i) ||
((*i == '/') && urlskipslash) ||
((*i == '=') && equalsencode) ||
((*i == '+') && plusencode)) {
if((*i == '=') && equalsencode)
/* only skip the first equals sign */
equalsencode = FALSE;
*o = *i;
o++;
}
else {
msnprintf(o, 4, "%%%02x", *i);
o += 3;
}
}
*o = 0; /* null-terminate */
newp = enc;
if(free_part)
free((char *)part);
}
else {
char *p;
newp = strdup(part);
if(!newp)
return CURLUE_OUT_OF_MEMORY;
p = (char *)newp;
while(*p) {
/* make sure percent encoded are lower case */
if((*p == '%') && ISXDIGIT(p[1]) && ISXDIGIT(p[2]) &&
(ISUPPER(p[1]) || ISUPPER(p[2]))) {
p[1] = (char)TOLOWER(p[1]);
p[2] = (char)TOLOWER(p[2]);
p += 3;
}
else
p++;
}
}
if(appendquery) {
/* Append the string onto the old query. Add a '&' separator if none is
present at the end of the exsting query already */
size_t querylen = u->query ? strlen(u->query) : 0;
bool addamperand = querylen && (u->query[querylen -1] != '&');
if(querylen) {
size_t newplen = strlen(newp);
char *p = malloc(querylen + addamperand + newplen + 1);
if(!p) {
free((char *)newp);
return CURLUE_OUT_OF_MEMORY;
}
strcpy(p, u->query); /* original query */
if(addamperand)
p[querylen] = '&'; /* ampersand */
strcpy(&p[querylen + addamperand], newp); /* new suffix */
free((char *)newp);
free(*storep);
*storep = p;
return CURLUE_OK;
}
}
if(what == CURLUPART_HOST) {
if(0 == strlen(newp) && (flags & CURLU_NO_AUTHORITY)) {
/* Skip hostname check, it's allowed to be empty. */
}
else {
if(hostname_check(u, (char *)newp)) {
free((char *)newp);
return CURLUE_MALFORMED_INPUT;
}
}
}
free(*storep);
*storep = (char *)newp;
}
/* set after the string, to make it not assigned if the allocation above
fails */
if(port)
u->portnum = port;
return CURLUE_OK;
}
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