From 34d81974d341e0174d1fc690b4d3e3b9b1767586 Mon Sep 17 00:00:00 2001
From: Rich Felker <dalias@aerifal.cx>
Date: Mon, 25 Apr 2011 17:04:40 -0400
Subject: [PATCH] ipv6 parsing code (formerly dummied-out)

---
 src/network/__ipparse.c |  8 ++++--
 src/network/inet_pton.c | 62 +++++++++++++++++++++++++++++++++++++----
 2 files changed, 62 insertions(+), 8 deletions(-)

diff --git a/src/network/__ipparse.c b/src/network/__ipparse.c
index 604bdc2f..b0647aac 100644
--- a/src/network/__ipparse.c
+++ b/src/network/__ipparse.c
@@ -2,11 +2,13 @@
 #include <stdlib.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
+#include <arpa/inet.h>
 #include "__dns.h"
 #include <stdio.h>
 
-int __ipparse(void *dest, int family, const char *s)
+int __ipparse(void *dest, int family, const char *s0)
 {
+	const char *s = s0;
 	unsigned char *d = dest;
 	unsigned long a[16] = { 0 };
 	const char *z;
@@ -37,5 +39,7 @@ int __ipparse(void *dest, int family, const char *s)
 	return 0;
 
 not_v4:
-	return -1;
+	s = s0;
+	((struct sockaddr_in6 *)d)->sin6_family = AF_INET6;
+	return inet_pton(AF_INET6, s, (void *)&((struct sockaddr_in6 *)d)->sin6_addr) <= 0 ? -1 : 0;
 }
diff --git a/src/network/inet_pton.c b/src/network/inet_pton.c
index b7f4834f..5affb08d 100644
--- a/src/network/inet_pton.c
+++ b/src/network/inet_pton.c
@@ -4,14 +4,23 @@
 #include <stdlib.h>
 #include <ctype.h>
 #include <errno.h>
-#include "__dns.h"
+#include <string.h>
+
+static int hexval(unsigned c)
+{
+	if (c-'0'<10) return c-'0';
+	c |= 32;
+	if (c-'a'<6) return c-'a'+10;
+	return -1;
+}
 
 int inet_pton(int af, const char *s, void *a0)
 {
+	uint16_t ip[8];
 	unsigned char *a = a0;
 	const char *z;
 	unsigned long x;
-	int i;
+	int i, j, v, d, brk=-1, need_v4=0;
 
 	/* Reimplement this because inet_pton cannot accept special v4 forms */
 	if (af==AF_INET) {
@@ -22,10 +31,51 @@ int inet_pton(int af, const char *s, void *a0)
 			s=z+1;
 		}
 		return 1;
-	} else if (af==AF_INET6) {
-		return !__ipparse(a, AF_INET6, s);
+	} else if (af!=AF_INET6) {
+		errno = EAFNOSUPPORT;
+		return -1;
 	}
 
-	errno = EAFNOSUPPORT;
-	return -1;
+	if (s[0]==':' && s[1]==':') {
+		s+=2;
+		brk=0;
+	}
+
+	for (i=0; ; i++, s+=j+1) {
+		if (s[0]==':' && brk<0) {
+			brk=i;
+			j=0;
+			ip[i]=0;
+			if (!s[1]) break;
+			continue;
+		}
+		if (hexval(s[0])<0) return -1;
+		while (s[0]=='0' && s[1]=='0') s++;
+		for (v=j=0; j<5 && (d=hexval(s[j]))>=0; j++)
+			v=16*v+d;
+		if (v > 65535) return -1;
+		ip[i] = v;
+		if (!s[j]) {
+			if (brk<0 && i!=7) return -1;
+			break;
+		}
+		if (i<7) {
+			if (s[j]==':') continue;
+			if (s[j]!='.') return -1;
+			need_v4=1;
+			i++;
+			break;
+		}
+		return -1;
+	}
+	if (brk>=0) {
+		memmove(ip+brk+7-i, ip+brk, 2*(i+1-brk));
+		for (j=0; j<7-i; j++) ip[brk+j] = 0;
+	}
+	for (j=0; j<8; j++) {
+		*a++ = ip[j]>>8;
+		*a++ = ip[j];
+	}
+	if (need_v4 &&inet_pton(AF_INET, (void *)s, a-4) <= 0) return -1;
+	return 1;
 }
-- 
2.20.1