CURLOPT_CONNECT_TO: Skip non-matching "connect-to" entries properly

If a port number in a "connect-to" entry does not match, skip this
entry instead of connecting to port 0.

If a port number in a "connect-to" entry matches, use this entry
and look no further.

Reported-by: Jay Satiro
Assisted-by: Jay Satiro, Daniel Stenberg

Closes #1148

lib/url.c

@@ -5677,6 +5677,9 @@ static CURLcode parse_connect_to_string(struct Curl_easy *data,
   int host_match = FALSE;
   int port_match = FALSE;
 
+  *host_result = NULL;
+  *port_result = -1;
+
   if(*ptr == ':') {
     /* an empty hostname always matches */
     host_match = TRUE;
@@ -5739,9 +5742,9 @@ static CURLcode parse_connect_to_slist(struct Curl_easy *data,
 {
   CURLcode result = CURLE_OK;
   char *host = NULL;
-  int port = 0;
+  int port = -1;
 
-  while(conn_to_host && !host) {
+  while(conn_to_host && !host && port == -1) {
     result = parse_connect_to_string(data, conn, conn_to_host->data,
                                      &host, &port);
     if(result)
@@ -5760,7 +5763,7 @@ static CURLcode parse_connect_to_slist(struct Curl_easy *data,
     else {
       /* no "connect to host" */
       conn->bits.conn_to_host = FALSE;
-      free(host);
+      Curl_safefree(host);
     }
 
     if(port >= 0) {
@@ -5771,6 +5774,7 @@ static CURLcode parse_connect_to_slist(struct Curl_easy *data,
     else {
       /* no "connect to port" */
       conn->bits.conn_to_port = FALSE;
+      port = -1;
     }
 
     conn_to_host = conn_to_host->next;

tests/data/Makefile.inc

@@ -175,4 +175,4 @@ test2016 test2017 test2018 test2019 test2020 test2021 test2022 test2023 \
 test2024 test2025 test2026 test2027 test2028 test2029 test2030 test2031 \
 test2032 test2033 test2034 test2035 test2036 test2037 test2038 test2039 \
 test2040 test2041 test2042 test2043 test2044 test2045 test2046 test2047 \
-test2048 test2049 test2050 test2051 test2052
+test2048 test2049 test2050 test2051 test2052 test2053 test2054

tests/data/test2053

@@ -0,0 +1,56 @@
+<testcase>
+<info>
+<keywords>
+HTTP
+HTTP GET
+CURLOPT_CONNECT_TO
+</keywords>
+</info>
+
+#
+# Server-side
+<reply>
+<data>
+HTTP/1.1 200 OK
+Date: Thu, 09 Nov 2010 14:49:00 GMT
+Content-Length: 3
+Content-Type: text/plain
+
+OK
+</data>
+</reply>
+
+#
+# Client-side
+<client>
+<server>
+http
+</server>
+ <name>
+Connect to specific host with IP addresses
+ </name>
+
+ <command>
+http://10.0.0.1:8081/2053 --connect-to 10.0.0.1:8081:%HOSTIP:%HTTPPORT --next http://[fc00::1]:8082/2053 --connect-to [fc00::1]:8082:%HOSTIP:%HTTPPORT
+</command>
+</client>
+
+#
+# Verify data after the test has been "shot"
+<verify>
+<strip>
+^User-Agent:.*
+</strip>
+<protocol>
+GET /2053 HTTP/1.1
+Host: 10.0.0.1:8081
+Accept: */*
+
+GET /2053 HTTP/1.1
+Host: [fc00::1]:8082
+Accept: */*
+
+</protocol>
+
+</verify>
+</testcase>

tests/data/test2054

@@ -0,0 +1,64 @@
+<testcase>
+<info>
+<keywords>
+HTTP
+HTTP GET
+CURLOPT_CONNECT_TO
+</keywords>
+</info>
+
+#
+# Server-side
+<reply>
+<data>
+HTTP/1.1 200 OK
+Date: Thu, 09 Nov 2010 14:49:00 GMT
+Content-Length: 3
+Content-Type: text/plain
+
+OK
+</data>
+</reply>
+
+#
+# Client-side
+<client>
+<server>
+http
+</server>
+ <name>
+Connect to specific host: use the first "connect-to" string that matches
+ </name>
+
+ <command>
+http://%HOSTIP:%HTTPPORT/2054 --connect-to foo::bar: --connect-to :123::456 --next http://www.example.com:%HTTPPORT/2054 --connect-to www.example.com::%HOSTIP: --connect-to www.example.com::foo: --next http://%HOSTIP:8083/2054 --connect-to :8083::%HTTPPORT --connect-to :8083::123 --next http://www.example.com:8084/2054 --connect-to www.example.com:8084:%HOSTIP:%HTTPPORT --connect-to www.example.com:8084:foo:123
+</command>
+</client>
+
+#
+# Verify data after the test has been "shot"
+<verify>
+<strip>
+^User-Agent:.*
+</strip>
+<protocol>
+GET /2054 HTTP/1.1
+Host: %HOSTIP:%HTTPPORT
+Accept: */*
+
+GET /2054 HTTP/1.1
+Host: www.example.com:%HTTPPORT
+Accept: */*
+
+GET /2054 HTTP/1.1
+Host: %HOSTIP:8083
+Accept: */*
+
+GET /2054 HTTP/1.1
+Host: www.example.com:8084
+Accept: */*
+
+</protocol>
+
+</verify>
+</testcase>