From 471851713af20d84b67b8966471ea758dc8c12b9 Mon Sep 17 00:00:00 2001
From: Tim Duesterhus <tim@bastelstu.be>
Date: Thu, 25 Jan 2018 16:24:49 +0100
Subject: [PATCH] MINOR: standard: Add str2mask6 function

This new function mirrors the str2mask() function for IPv4 addresses.

This commit is in preparation to support ARGT_MSK6.
---
 include/common/standard.h |  6 ++++++
 src/standard.c            | 22 ++++++++++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/include/common/standard.h b/include/common/standard.h
index dd89203ae..461044787 100644
--- a/include/common/standard.h
+++ b/include/common/standard.h
@@ -377,6 +377,12 @@ struct sockaddr_storage *str2sa_range(const char *str,
  */
 int str2mask(const char *str, struct in_addr *mask);
 
+/* converts <str> to a struct in6_addr containing a network mask. It can be
+ * passed in quadruplet form (ffff::ffff::) or in CIDR form (64). It returns 1
+ * if the conversion succeeds otherwise zero.
+ */
+int str2mask6(const char *str, struct in6_addr *mask);
+
 /* convert <cidr> to struct in_addr <mask>. It returns 1 if the conversion
  * succeeds otherwise non-zero.
  */
diff --git a/src/standard.c b/src/standard.c
index 495bae571..707e2c716 100644
--- a/src/standard.c
+++ b/src/standard.c
@@ -1028,6 +1028,28 @@ int str2mask(const char *str, struct in_addr *mask)
 	return 1;
 }
 
+/* converts <str> to a struct in6_addr containing a network mask. It can be
+ * passed in quadruplet form (ffff::ffff::) or in CIDR form (64). It returns 1
+ * if the conversion succeeds otherwise zero.
+ */
+int str2mask6(const char *str, struct in6_addr *mask)
+{
+	if (strchr(str, ':') != NULL) {	    /* quadruplet notation */
+		if (!inet_pton(AF_INET6, str, mask))
+			return 0;
+	}
+	else { /* mask length */
+		char *err;
+		unsigned long len = strtol(str, &err, 10);
+
+		if (!*str || (err && *err) || (unsigned)len > 128)
+			return 0;
+
+		len2mask6(len, mask);
+	}
+	return 1;
+}
+
 /* convert <cidr> to struct in_addr <mask>. It returns 1 if the conversion
  * succeeds otherwise zero.
  */