parse_proxy: treat "socks://x" as a socks4 proxy

Selected socks proxy in Google's Chrome browser. Resulting in the
following environment variables:

NO_PROXY=localhost,127.0.0.0/8
ALL_PROXY=socks://localhost:1080/
all_proxy=socks://localhost:1080/
no_proxy=localhost,127.0.0.0/8

... and libcurl didn't treat 'socks://' as socks but instead picked HTTP
proxy.

Reported by: Scott Bailey

Bug: http://curl.haxx.se/bug/view.cgi?id=3566860

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/url.c b/lib/url.c
index c05c50e62..8bbd3e478 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -4249,7 +4249,7 @@ static CURLcode parse_proxy(struct SessionHandle *data,
       conn->proxytype = CURLPROXY_SOCKS5;
     else if(checkprefix("socks4a", proxy))
       conn->proxytype = CURLPROXY_SOCKS4A;
-    else if(checkprefix("socks4", proxy))
+    else if(checkprefix("socks4", proxy) || checkprefix("socks", proxy))
       conn->proxytype = CURLPROXY_SOCKS4;
     /* Any other xxx:// : change to http proxy */
   }