From aeae1f5b6c6cf22c2854e07f11555591c5430607 Mon Sep 17 00:00:00 2001
From: Chung-yih Wang <cywang@google.com>
Date: Thu, 9 Apr 2009 18:09:50 +0800
Subject: [PATCH] Add the domain search list for VPN connection.   The current
 solution is to read the net.dns.search property, and expand the list during
 the resolve initialization. In the future, we could implement search list per
 process.

Update: refine the code accordingly.

Update: remove unnecessary code.

Update: remove the unused variable.
---
 libc/netbsd/resolv/res_init.c | 37 +++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/libc/netbsd/resolv/res_init.c b/libc/netbsd/resolv/res_init.c
index fc0272c43..751603d43 100644
--- a/libc/netbsd/resolv/res_init.c
+++ b/libc/netbsd/resolv/res_init.c
@@ -112,6 +112,7 @@ __RCSID("$NetBSD: res_init.c,v 1.8 2006/03/19 03:10:08 christos Exp $");
 #define MAX_DNS_PROPERTIES 8
 #define DNS_PROP_NAME_PREFIX "net.dns"
 #define DNS_CHANGE_PROP_NAME "net.dnschange"
+#define DNS_SEARCH_PROP_NAME "net.dns.search"
 const prop_info *dns_change_prop;
 int dns_last_change_counter;
 static int _get_dns_change_count();
@@ -168,6 +169,39 @@ res_ninit(res_state statp) {
 	return (__res_vinit(statp, 0));
 }
 
+#ifdef ANDROID_CHANGES
+int load_domain_search_list(res_state statp) {
+	char propvalue[PROP_VALUE_MAX];
+	register char *cp, **pp;
+
+	if(__system_property_get(DNS_SEARCH_PROP_NAME, propvalue) >= 1) {
+		strlcpy(statp->defdname, propvalue, sizeof(statp->defdname));
+		if ((cp = strchr(statp->defdname, '\n')) != NULL)
+			*cp = '\0';
+		cp = statp->defdname;
+		pp = statp->dnsrch;
+		while ( pp < statp->dnsrch + MAXDNSRCH ) {
+			while (*cp == ' ' || *cp == '\t') /* skip leading white space */
+				cp++;
+			if (*cp == '\0')  /* stop if nothing more */
+				break;
+			*pp++ = cp;  /* record this search domain */
+			while (*cp) { /* zero-terminate it */
+				if (*cp == ' ' || *cp == '\t') {
+					*cp++ = '\0';
+					break;
+				}
+				cp++;
+			}
+		}
+		*pp = NULL; /* statp->dnsrch has MAXDNSRCH+1 items */
+		if (pp > statp->dnsrch)
+			return 1;
+	}
+	return 0;
+}
+#endif
+
 /* This function has to be reachable by res_data.c but not publicly. */
 int
 __res_vinit(res_state statp, int preinit) {
@@ -344,6 +378,9 @@ __res_vinit(res_state statp, int preinit) {
 			}
 		}
 	}
+
+	/* Add the domain search list */
+	havesearch = load_domain_search_list(statp);
 #else /* IGNORE resolv.conf */
 #define	MATCH(line, name) \
 	(!strncmp(line, name, sizeof(name) - 1) && \