url: Fix NO_PROXY env var to work properly with --proxy option.

The combination of --noproxy option and http_proxy env var works well
both for proxied hosts and non-proxied hosts.

However, when combining NO_PROXY env var with --proxy option,
non-proxied hosts are not reachable while proxied host is OK.

This patch allows us to access non-proxied hosts even if using NO_PROXY
env var with --proxy option.

lib/url.c

@@ -6079,6 +6079,7 @@ static CURLcode create_conn(struct Curl_easy *data,
   bool reuse;
   char *proxy = NULL;
   char *socksproxy = NULL;
+  char *no_proxy = NULL;
   bool prot_missing = FALSE;
   bool connections_available = TRUE;
   bool force_reuse = FALSE;
@@ -6255,14 +6256,21 @@ static CURLcode create_conn(struct Curl_easy *data,
     }
   }
 
-  if(data->set.str[STRING_NOPROXY] &&
+  no_proxy = curl_getenv("no_proxy");
-     check_noproxy(conn->host.name, data->set.str[STRING_NOPROXY])) {
+  if(!no_proxy)
+    no_proxy = curl_getenv("NO_PROXY");
+
+  if(check_noproxy(conn->host.name, data->set.str[STRING_NOPROXY]) ||
+     (!data->set.str[STRING_NOPROXY] &&
+      check_noproxy(conn->host.name, no_proxy))) {
     Curl_safefree(proxy);
     Curl_safefree(socksproxy);
   }
   else if(!proxy && !socksproxy)
     proxy = detect_proxy(conn);
 
+  Curl_safefree(no_proxy);
+
 #ifdef USE_UNIX_SOCKETS
   if(data->set.str[STRING_UNIX_SOCKET_PATH]) {
     if(proxy) {

tests/data/Makefile.inc

@@ -127,7 +127,7 @@ test1216 test1217 test1218 test1219 \
 test1220 test1221 test1222 test1223 test1224 test1225 test1226 test1227 \
 test1228 test1229 test1230 test1231 test1232 test1233 test1234 test1235 \
 test1236 test1237 test1238 test1239 test1240 test1241 test1242 test1243 \
-test1244 test1245 test1246 test1247 \
+test1244 test1245 test1246 test1247 test1248 test1249 test1250 test1251 \
 \
 test1280 test1281 test1282 \
 \

tests/data/test1248

@@ -0,0 +1,49 @@
+<testcase>
+<info>
+<keywords>
+HTTP
+HTTP proxy
+noproxy
+</keywords>
+</info>
+
+# Server-side
+<reply>
+<data>
+HTTP/1.1 200 OK
+Date: Thu, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Content-Length: 4
+Content-Type: text/html
+
+foo
+</data>
+</reply>
+
+# Client-side
+<client>
+<server>
+http
+</server>
+<name>
+Access a non-proxied host with using the combination of --proxy option and --noproxy option
+</name>
+<command>
+http://user:secret@%HOSTIP:%HTTPPORT/1248 --proxy http://dummy:%PROXYPORT/ --noproxy %HOSTIP --max-time 5
+</command>
+</client>
+
+# Verify data after the test has been "shot"
+<verify>
+<strip>
+^User-Agent:.*
+</strip>
+<protocol>
+GET /1248 HTTP/1.1
+Host: %HOSTIP:%HTTPPORT
+Authorization: Basic dXNlcjpzZWNyZXQ=
+Accept: */*
+
+</protocol>
+</verify>
+</testcase>

tests/data/test1249

@@ -0,0 +1,52 @@
+<testcase>
+<info>
+<keywords>
+HTTP
+HTTP proxy
+NO_PROXY
+</keywords>
+</info>
+
+# Server-side
+<reply>
+<data>
+HTTP/1.1 200 OK
+Date: Thu, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Content-Length: 4
+Content-Type: text/html
+
+foo
+</data>
+</reply>
+
+# Client-side
+<client>
+<server>
+http
+</server>
+<name>
+Access a non-proxied host with using the combination of --proxy option and NO_PROXY env var
+</name>
+<setenv>
+NO_PROXY=%HOSTIP
+</setenv>
+<command>
+http://user:secret@%HOSTIP:%HTTPPORT/1249 --proxy http://dummy:%PROXYPORT/ --max-time 5
+</command>
+</client>
+
+# Verify data after the test has been "shot"
+<verify>
+<strip>
+^User-Agent:.*
+</strip>
+<protocol>
+GET /1249 HTTP/1.1
+Host: %HOSTIP:%HTTPPORT
+Authorization: Basic dXNlcjpzZWNyZXQ=
+Accept: */*
+
+</protocol>
+</verify>
+</testcase>

tests/data/test1250

@@ -0,0 +1,53 @@
+<testcase>
+<info>
+<keywords>
+HTTP
+HTTP proxy
+http_proxy
+noproxy
+</keywords>
+</info>
+
+# Server-side
+<reply>
+<data>
+HTTP/1.1 200 OK
+Date: Thu, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Content-Length: 4
+Content-Type: text/html
+
+foo
+</data>
+</reply>
+
+# Client-side
+<client>
+<server>
+http
+</server>
+<name>
+Access a non-proxied host with using the combination of http_proxy env var and --noproxy option
+</name>
+<setenv>
+http_proxy=http://dummy:%PROXYPORT/
+</setenv>
+<command>
+http://user:secret@%HOSTIP:%HTTPPORT/1250 --noproxy %HOSTIP --max-time 5
+</command>
+</client>
+
+# Verify data after the test has been "shot"
+<verify>
+<strip>
+^User-Agent:.*
+</strip>
+<protocol>
+GET /1250 HTTP/1.1
+Host: %HOSTIP:%HTTPPORT
+Authorization: Basic dXNlcjpzZWNyZXQ=
+Accept: */*
+
+</protocol>
+</verify>
+</testcase>

tests/data/test1251

@@ -0,0 +1,54 @@
+<testcase>
+<info>
+<keywords>
+HTTP
+HTTP proxy
+http_proxy
+NO_PROXY
+</keywords>
+</info>
+
+# Server-side
+<reply>
+<data>
+HTTP/1.1 200 OK
+Date: Thu, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Content-Length: 4
+Content-Type: text/html
+
+foo
+</data>
+</reply>
+
+# Client-side
+<client>
+<server>
+http
+</server>
+<name>
+Access a non-proxied host with using the combination of http_proxy env var and NO_PROXY env var
+</name>
+<setenv>
+http_proxy=http://dummy:%PROXYPORT/
+NO_PROXY=%HOSTIP
+</setenv>
+<command>
+http://user:secret@%HOSTIP:%HTTPPORT/1251 --max-time 5
+</command>
+</client>
+
+# Verify data after the test has been "shot"
+<verify>
+<strip>
+^User-Agent:.*
+</strip>
+<protocol>
+GET /1251 HTTP/1.1
+Host: %HOSTIP:%HTTPPORT
+Authorization: Basic dXNlcjpzZWNyZXQ=
+Accept: */*
+
+</protocol>
+</verify>
+</testcase>