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https://bugs.gentoo.org/878365#c2
https://github.com/curl/curl/issues/9821
https://github.com/curl/curl/commit/b830f9ba9e94acf672cd191993ff679fa888838b
From b830f9ba9e94acf672cd191993ff679fa888838b Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Fri, 28 Oct 2022 10:51:49 +0200
Subject: [PATCH] noproxy: fix tail-matching
Also ignore trailing dots in both host name and comparison pattern.
Regression in 7.86.0 (from 1e9a538e05c0)
Extended test 1614 to verify better.
Reported-by: Henning Schild
Fixes #9821
Closes #9822
--- a/lib/noproxy.c
+++ b/lib/noproxy.c
@@ -153,9 +153,14 @@ bool Curl_check_noproxy(const char *name, const char *no_proxy)
}
else {
unsigned int address;
+ namelen = strlen(name);
if(1 == Curl_inet_pton(AF_INET, name, &address))
type = TYPE_IPV4;
- namelen = strlen(name);
+ else {
+ /* ignore trailing dots in the host name */
+ if(name[namelen - 1] == '.')
+ namelen--;
+ }
}
while(*p) {
@@ -177,12 +182,23 @@ bool Curl_check_noproxy(const char *name, const char *no_proxy)
if(tokenlen) {
switch(type) {
case TYPE_HOST:
- if(*token == '.') {
- ++token;
- --tokenlen;
- /* tailmatch */
- match = (tokenlen <= namelen) &&
- strncasecompare(token, name + (namelen - tokenlen), namelen);
+ /* ignore trailing dots in the token to check */
+ if(token[tokenlen - 1] == '.')
+ tokenlen--;
+
+ if(tokenlen && (*token == '.')) {
+ /* A: example.com matches '.example.com'
+ B: www.example.com matches '.example.com'
+ C: nonexample.com DOES NOT match '.example.com'
+ */
+ if((tokenlen - 1) == namelen)
+ /* case A, exact match without leading dot */
+ match = strncasecompare(token + 1, name, namelen);
+ else if(tokenlen < namelen)
+ /* case B, tailmatch with leading dot */
+ match = strncasecompare(token, name + (namelen - tokenlen),
+ tokenlen);
+ /* case C passes through, not a match */
}
else
match = (tokenlen == namelen) &&
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