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authorSalah-Eddin Shaban <salshaaban@gmail.com>2017-08-10 21:09:23 +0300
committerDaniel Stenberg <daniel@haxx.se>2017-08-12 16:39:09 +0200
commit0860de2ce90f4ff7e6a1d7cdea8d654b67badecf (patch)
tree40d6b0b3ae3efe2d242fbb00ac2731a141fcdca6
parent7c711996a86587d76fe8c0dcc24d16b6c947b288 (diff)
downloadcurl-0860de2ce90f4ff7e6a1d7cdea8d654b67badecf.tar.gz
redirect: skip URL encoding for host names
This fixes redirects to IDN URLs Bug: #1441 Reported by: David Lord
-rw-r--r--lib/transfer.c68
1 files changed, 62 insertions, 6 deletions
diff --git a/lib/transfer.c b/lib/transfer.c
index 81c056e0e..3537b58c6 100644
--- a/lib/transfer.c
+++ b/lib/transfer.c
@@ -1391,16 +1391,56 @@ CURLcode Curl_posttransfer(struct Curl_easy *data)
#ifndef CURL_DISABLE_HTTP
/*
+ * 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;
+}
+
+/*
* 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)
+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;
@@ -1423,16 +1463,29 @@ static size_t strlen_url(const char *url)
/* 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)
+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;
@@ -1488,6 +1541,7 @@ static char *concat_url(const char *base, const char *relurl)
char *protsep;
char *pathsep;
size_t newlen;
+ bool host_changed = FALSE;
const char *useurl = relurl;
size_t urllen;
@@ -1568,6 +1622,7 @@ static char *concat_url(const char *base, const char *relurl)
*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
@@ -1599,7 +1654,7 @@ static char *concat_url(const char *base, const char *relurl)
letter we replace each space with %20 while it is replaced with '+'
on the right side of the '?' letter.
*/
- newlen = strlen_url(useurl);
+ newlen = strlen_url(useurl, !host_changed);
urllen = strlen(url_clone);
@@ -1621,7 +1676,7 @@ static char *concat_url(const char *base, const char *relurl)
newest[urllen++]='/';
/* then append the new piece on the right side */
- strcpy_url(&newest[urllen], useurl);
+ strcpy_url(&newest[urllen], useurl, !host_changed);
free(url_clone);
@@ -1694,7 +1749,7 @@ CURLcode Curl_follow(struct Curl_easy *data,
/* The new URL MAY contain space or high byte values, that means a mighty
stupid redirect URL but we still make an effort to do "right". */
char *newest;
- size_t newlen = strlen_url(newurl);
+ size_t newlen = strlen_url(newurl, FALSE);
/* This is an absolute URL, don't allow the custom port number */
disallowport = TRUE;
@@ -1702,7 +1757,8 @@ CURLcode Curl_follow(struct Curl_easy *data,
newest = malloc(newlen+1); /* get memory for this */
if(!newest)
return CURLE_OUT_OF_MEMORY;
- strcpy_url(newest, newurl); /* create a space-free URL */
+
+ strcpy_url(newest, newurl, FALSE); /* create a space-free URL */
newurl = newest; /* use this instead now */
}