From e7c9640ce195283929879282e1371f1345e81e14 Mon Sep 17 00:00:00 2001
From: Enrico Bianco <enricob@gmail.com>
Date: Sat, 14 May 2011 00:34:46 -0400
Subject: [PATCH] Support CURLOPT_IPRESOLVE with Curl::Easy#resolve_mode.

:auto is CURL_IPRESOLVE_WHATEVER,
:ipv4 is CURL_IPRESOLVE_V4,
:ipv6 is CURL_IPRESOLVE_V6
---
 ext/curb_easy.c       | 63 +++++++++++++++++++++++++++++++++++++++++++
 ext/curb_easy.h       |  1 +
 ext/curb_macros.h     |  1 +
 tests/tc_curl_easy.rb | 11 ++++++++
 4 files changed, 76 insertions(+)

diff --git a/ext/curb_easy.c b/ext/curb_easy.c
index 4976f9d1..4ac958cd 100644
--- a/ext/curb_easy.c
+++ b/ext/curb_easy.c
@@ -1570,6 +1570,65 @@ static VALUE ruby_curl_easy_ignore_content_length_q(VALUE self) {
   CURB_BOOLEAN_GETTER(ruby_curl_easy, ignore_content_length);
 }
 
+/*
+ * call-seq:
+ *   easy.resolve_mode                                      => symbol
+ *
+ * Determines what type of IP address this Curl::Easy instance
+ * resolves DNS names to.
+ */
+static VALUE ruby_curl_easy_resolve_mode(VALUE self) {
+  ruby_curl_easy *rbce;
+  Data_Get_Struct(self, ruby_curl_easy, rbce);
+
+  unsigned short rm = rbce->resolve_mode;
+
+  switch(rm) {
+    case CURL_IPRESOLVE_V4:
+      return rb_easy_sym("ipv4");
+    case CURL_IPRESOLVE_V6:
+      return rb_easy_sym("ipv6");
+    default:
+      return rb_easy_sym("auto");
+  }
+}
+
+/*
+ * call-seq:
+ *   easy.resolve_mode = symbol                             => symbol
+ *
+ * Configures what type of IP address this Curl::Easy instance
+ * resolves DNS names to. Valid options are:
+ *
+ * [:auto]  resolves DNS names to all IP versions your system allows
+ * [:ipv4]  resolves DNS names to IPv4 only
+ * [:ipv6]  resolves DNS names to IPv6 only
+ */
+static VALUE ruby_curl_easy_resolve_mode_set(VALUE self, VALUE resolve_mode) {
+  if (TYPE(resolve_mode) != T_SYMBOL) {
+    rb_raise(rb_eTypeError, "Must pass a symbol");
+    return Qnil;
+  } else {
+    ruby_curl_easy *rbce;
+    Data_Get_Struct(self, ruby_curl_easy, rbce);
+
+    ID resolve_mode_id = rb_to_id(resolve_mode);
+
+    if (resolve_mode_id == rb_intern("auto")) {
+      rbce->resolve_mode = CURL_IPRESOLVE_WHATEVER;
+      return resolve_mode;
+    } else if (resolve_mode_id == rb_intern("ipv4")) {
+      rbce->resolve_mode = CURL_IPRESOLVE_V4;
+      return resolve_mode;
+    } else if (resolve_mode_id == rb_intern("ipv6")) {
+      rbce->resolve_mode = CURL_IPRESOLVE_V6;
+      return resolve_mode;
+    } else {
+      rb_raise(rb_eArgError, "Must set to one of :auto, :ipv4, :ipv6");
+      return Qnil;
+    }
+  }
+}
 
 
 /* ================= EVENT PROCS ================== */
@@ -1877,6 +1936,8 @@ VALUE ruby_curl_easy_setup( ruby_curl_easy *rbce ) {
 
   curl_easy_setopt(curl, CURLOPT_IGNORE_CONTENT_LENGTH, rbce->ignore_content_length);
 
+  curl_easy_setopt(curl, CURLOPT_IPRESOLVE, rbce->resolve_mode);
+
 
 #if LIBCURL_VERSION_NUM >= 0x070a08
   curl_easy_setopt(curl, CURLOPT_FTP_RESPONSE_TIMEOUT, rbce->ftp_response_timeout);
@@ -3193,6 +3254,8 @@ void init_curb_easy() {
   rb_define_method(cCurlEasy, "enable_cookies?", ruby_curl_easy_enable_cookies_q, 0);
   rb_define_method(cCurlEasy, "ignore_content_length=", ruby_curl_easy_ignore_content_length_set, 1);
   rb_define_method(cCurlEasy, "ignore_content_length?", ruby_curl_easy_ignore_content_length_q, 0);
+  rb_define_method(cCurlEasy, "resolve_mode", ruby_curl_easy_resolve_mode, 0);
+  rb_define_method(cCurlEasy, "resolve_mode=", ruby_curl_easy_resolve_mode_set, 1);
 
   rb_define_method(cCurlEasy, "on_body", ruby_curl_easy_on_body_set, -1);
   rb_define_method(cCurlEasy, "on_header", ruby_curl_easy_on_header_set, -1);
diff --git a/ext/curb_easy.h b/ext/curb_easy.h
index 97b931ca..97423474 100644
--- a/ext/curb_easy.h
+++ b/ext/curb_easy.h
@@ -56,6 +56,7 @@ typedef struct {
   long ssl_version;
   long use_ssl;
   long ftp_filemethod;
+  unsigned short resolve_mode;
 
   /* bool flags */
   char proxy_tunnel;
diff --git a/ext/curb_macros.h b/ext/curb_macros.h
index 98333a9f..67f3f157 100644
--- a/ext/curb_macros.h
+++ b/ext/curb_macros.h
@@ -8,6 +8,7 @@
 #ifndef __CURB_MACROS_H
 #define __CURB_MACROS_H
 
+#define rb_easy_sym(sym) ID2SYM(rb_intern(sym))
 #define rb_easy_hkey(key) ID2SYM(rb_intern(key))
 #define rb_easy_set(key,val) rb_hash_aset(rbce->opts, rb_easy_hkey(key) , val)
 #define rb_easy_get(key) rb_hash_aref(rbce->opts, rb_easy_hkey(key))
diff --git a/tests/tc_curl_easy.rb b/tests/tc_curl_easy.rb
index fcf8c878..47f55a1d 100644
--- a/tests/tc_curl_easy.rb
+++ b/tests/tc_curl_easy.rb
@@ -507,6 +507,17 @@ def test_ignore_content_length
     assert c.ignore_content_length?
   end
 
+  def test_resolve_mode
+    c = Curl::Easy.new
+    assert c.resolve_mode == :auto
+    c.resolve_mode = :ipv4
+    assert c.resolve_mode == :ipv4
+    c.resolve_mode = :ipv6
+    assert c.resolve_mode == :ipv6
+
+    assert_raises(ArgumentError) { c.resolve_mode = :bad }
+  end
+
   def test_enable_cookies
     c = Curl::Easy.new
     assert !c.enable_cookies?