Bug #340899 - Validate getaddrinfo() results.

1 files changed, 29 insertions, 0 deletions

diff --git a/pym/_emerge/sync/getaddrinfo_validate.py b/pym/_emerge/sync/getaddrinfo_validate.py
new file mode 100644
index 000000000..5e6009c74
--- /dev/null
+++ b/pym/_emerge/sync/getaddrinfo_validate.py
@@ -0,0 +1,29 @@
+# Copyright 2010 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+import sys
+
+if sys.hexversion >= 0x3000000:
+	basestring = str
+
+def getaddrinfo_validate(addrinfos):
+	"""
+	Validate structures returned from getaddrinfo(),
+	since they may be corrupt, especially when python
+	has IPv6 support disabled (bug #340899).
+	"""
+	valid_addrinfos = []
+	for addrinfo in addrinfos:
+		try:
+			if len(addrinfo) != 5:
+				continue
+			if len(addrinfo[4]) < 2:
+				continue
+			if not isinstance(addrinfo[4][0], basestring):
+				continue
+		except TypeError:
+			continue
+
+		valid_addrinfos.append(addrinfo)
+
+	return valid_addrinfos