Merge tag 'android-4.4_r1' into cm-11.0

Android 4.4 Release 1.0

Conflicts:
	libc/arch-arm/arm.mk
	libc/upstream-freebsd/lib/libc/stdlib/getopt_long.c
	linker/linker_phdr.cpp

8 files changed, 307 insertions, 84 deletions

diff --git a/libc/netbsd/gethnamaddr.c b/libc/netbsd/gethnamaddr.c
index ee5052e..5b2f987 100644
--- a/libc/netbsd/gethnamaddr.c
+++ b/libc/netbsd/gethnamaddr.c
@@ -126,7 +126,7 @@ static struct hostent *_gethtbyname2(const char *, int);
 static int _dns_gethtbyaddr(void *, void *, va_list);
 static int _dns_gethtbyname(void *, void *, va_list);
 
-static struct hostent *gethostbyname_internal(const char *, int, res_state, const char *);
+static struct hostent *gethostbyname_internal(const char *, int, res_state, const char *, int);
 
 static const ns_src default_dns_files[] = {
 	{ NSSRC_FILES, 	NS_SUCCESS },
@@ -497,13 +497,13 @@ gethostbyname(const char *name)
 
 	/* try IPv6 first - if that fails do IPv4 */
 	if (res->options & RES_USE_INET6) {
-		hp = gethostbyname_internal(name, AF_INET6, res, NULL);
+		hp = gethostbyname_internal(name, AF_INET6, res, NULL, 0);
 		if (hp) {
 			__res_put_state(res);
 			return hp;
 		}
 	}
-	hp = gethostbyname_internal(name, AF_INET, res, NULL);
+	hp = gethostbyname_internal(name, AF_INET, res, NULL, 0);
 	__res_put_state(res);
 	return hp;
 }
@@ -511,18 +511,18 @@ gethostbyname(const char *name)
 struct hostent *
 gethostbyname2(const char *name, int af)
 {
-	return android_gethostbynameforiface(name, af, NULL);
+	return android_gethostbynameforiface(name, af, NULL, 0);
 }
 
 struct hostent *
-android_gethostbynameforiface(const char *name, int af, const char *iface)
+android_gethostbynameforiface(const char *name, int af, const char *iface, int mark)
 {
 	struct hostent *hp;
 	res_state res = __res_get_state();
 
 	if (res == NULL)
 		return NULL;
-	hp = gethostbyname_internal(name, af, res, iface);
+	hp = gethostbyname_internal(name, af, res, iface, mark);
 	__res_put_state(res);
 	return hp;
 }
@@ -741,7 +741,7 @@ gethostbyname_internal_real(const char *name, int af, res_state res)
 
 // very similar in proxy-ness to android_getaddrinfo_proxy
 static struct hostent *
-gethostbyname_internal(const char *name, int af, res_state res, const char *iface)
+gethostbyname_internal(const char *name, int af, res_state res, const char *iface, int mark)
 {
 	const char *cache_mode = getenv("ANDROID_DNS_MODE");
 	FILE* proxy = NULL;
@@ -749,6 +749,7 @@ gethostbyname_internal(const char *name, int af, res_state res, const char *ifac
 
 	if (cache_mode != NULL && strcmp(cache_mode, "local") == 0) {
 		res_setiface(res, iface);
+		res_setmark(res, mark);
 		return gethostbyname_internal_real(name, af, res);
 	}
 
@@ -780,7 +781,7 @@ exit:
 
 struct hostent *
 android_gethostbyaddrforiface_proxy(const void *addr,
-    socklen_t len, int af, const char* iface)
+    socklen_t len, int af, const char* iface, int mark)
 {
 	struct hostent *result = NULL;
 	FILE* proxy = android_open_proxy();
@@ -810,7 +811,7 @@ exit:
 
 struct hostent *
 android_gethostbyaddrforiface_real(const void *addr,
-    socklen_t len, int af, const char* iface)
+    socklen_t len, int af, const char* iface, int mark)
 {
 	const u_char *uaddr = (const u_char *)addr;
 	socklen_t size;
@@ -858,28 +859,28 @@ android_gethostbyaddrforiface_real(const void *addr,
 	hp = NULL;
 	h_errno = NETDB_INTERNAL;
 	if (nsdispatch(&hp, dtab, NSDB_HOSTS, "gethostbyaddr",
-	    default_dns_files, uaddr, len, af, iface) != NS_SUCCESS)
+		default_dns_files, uaddr, len, af, iface, mark) != NS_SUCCESS)
 		return NULL;
 	h_errno = NETDB_SUCCESS;
 	return hp;
 }
 
 struct hostent *
-android_gethostbyaddrforiface(const void *addr, socklen_t len, int af, const char* iface)
+android_gethostbyaddrforiface(const void *addr, socklen_t len, int af, const char* iface, int mark)
 {
 	const char *cache_mode = getenv("ANDROID_DNS_MODE");
 
 	if (cache_mode == NULL || strcmp(cache_mode, "local") != 0) {
-		return android_gethostbyaddrforiface_proxy(addr, len, af, iface);
+		return android_gethostbyaddrforiface_proxy(addr, len, af, iface, mark);
 	} else {
-		return android_gethostbyaddrforiface_real(addr,len, af,iface);
+		return android_gethostbyaddrforiface_real(addr,len, af, iface, mark);
 	}
 }
 
 struct hostent *
 gethostbyaddr(const void *addr, socklen_t len, int af)
 {
-	return android_gethostbyaddrforiface(addr, len, af, NULL);
+	return android_gethostbyaddrforiface(addr, len, af, NULL, 0);
 }
 
 
@@ -1315,6 +1316,7 @@ _dns_gethtbyaddr(void *rv, void	*cb_data, va_list ap)
 	int len, af, advance;
 	res_state res;
 	const char* iface;
+	int mark;
 	res_static rs = __res_get_static();
 
 	assert(rv != NULL);
@@ -1323,6 +1325,7 @@ _dns_gethtbyaddr(void *rv, void	*cb_data, va_list ap)
 	len = va_arg(ap, int);
 	af = va_arg(ap, int);
 	iface = va_arg(ap, char *);
+	mark = va_arg(ap, int);
 
 	switch (af) {
 	case AF_INET:
@@ -1365,6 +1368,7 @@ _dns_gethtbyaddr(void *rv, void	*cb_data, va_list ap)
 		return NS_NOTFOUND;
 	}
 	res_setiface(res, iface);
+	res_setmark(res, mark);
 	n = res_nquery(res, qbuf, C_IN, T_PTR, buf->buf, sizeof(buf->buf));
 	if (n < 0) {
 		free(buf);
diff --git a/libc/netbsd/net/getaddrinfo.c b/libc/netbsd/net/getaddrinfo.c
index 401bc6e..937c423 100644
--- a/libc/netbsd/net/getaddrinfo.c
+++ b/libc/netbsd/net/getaddrinfo.c
@@ -93,6 +93,7 @@
 #include <errno.h>
 #include <netdb.h>
 #include "resolv_private.h"
+#include <stdbool.h>
 #include <stddef.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -214,7 +215,7 @@ struct res_target {
 
 static int str2number(const char *);
 static int explore_fqdn(const struct addrinfo *, const char *,
-	const char *, struct addrinfo **, const char *iface);
+	const char *, struct addrinfo **, const char *iface, int mark);
 static int explore_null(const struct addrinfo *,
 	const char *, struct addrinfo **);
 static int explore_numeric(const struct addrinfo *, const char *,
@@ -577,12 +578,12 @@ int
 getaddrinfo(const char *hostname, const char *servname,
     const struct addrinfo *hints, struct addrinfo **res)
 {
-	return android_getaddrinfoforiface(hostname, servname, hints, NULL, res);
+	return android_getaddrinfoforiface(hostname, servname, hints, NULL, 0, res);
 }
 
 int
 android_getaddrinfoforiface(const char *hostname, const char *servname,
-    const struct addrinfo *hints, const char *iface, struct addrinfo **res)
+    const struct addrinfo *hints, const char *iface, int mark, struct addrinfo **res)
 {
 	struct addrinfo sentinel;
 	struct addrinfo *cur;
@@ -761,7 +762,7 @@ android_getaddrinfoforiface(const char *hostname, const char *servname,
 			pai->ai_protocol = ex->e_protocol;
 
 		error = explore_fqdn(pai, hostname, servname,
-			&cur->ai_next, iface);
+			&cur->ai_next, iface, mark);
 
 		while (cur && cur->ai_next)
 			cur = cur->ai_next;
@@ -794,7 +795,7 @@ android_getaddrinfoforiface(const char *hostname, const char *servname,
  */
 static int
 explore_fqdn(const struct addrinfo *pai, const char *hostname,
-    const char *servname, struct addrinfo **res, const char *iface)
+    const char *servname, struct addrinfo **res, const char *iface, int mark)
 {
 	struct addrinfo *result;
 	struct addrinfo *cur;
@@ -820,7 +821,7 @@ explore_fqdn(const struct addrinfo *pai, const char *hostname,
 		return 0;
 
 	switch (nsdispatch(&result, dtab, NSDB_HOSTS, "getaddrinfo",
-			default_dns_files, hostname, pai, iface)) {
+			default_dns_files, hostname, pai, iface, mark)) {
 	case NS_TRYAGAIN:
 		error = EAI_AGAIN;
 		goto free;
@@ -1864,17 +1865,19 @@ error:
 	free(elems);
 }
 
-static int _using_alt_dns()
+static bool _using_default_dns(const char *iface)
 {
-	char propname[PROP_NAME_MAX];
-	char propvalue[PROP_VALUE_MAX];
+	char buf[IF_NAMESIZE+1];
+	size_t if_len;
 
-	propvalue[0] = 0;
-	snprintf(propname, sizeof(propname), "net.dns1.%d", getpid());
-	if (__system_property_get(propname, propvalue) > 0 ) {
-		return 1;
+	// common case
+	if (iface == NULL || *iface == '\0') return true;
+
+	if_len = _resolv_get_default_iface(buf, sizeof(buf));
+	if (if_len != 0 && if_len + 1 <= sizeof(buf)) {
+		if (strcmp(buf, iface) == 0) return true;
 	}
-	return 0;
+	return false;
 }
 
 /*ARGSUSED*/
@@ -1889,10 +1892,12 @@ _dns_getaddrinfo(void *rv, void	*cb_data, va_list ap)
 	struct res_target q, q2;
 	res_state res;
 	const char* iface;
+	int mark;
 
 	name = va_arg(ap, char *);
 	pai = va_arg(ap, const struct addrinfo *);
 	iface = va_arg(ap, char *);
+	mark = va_arg(ap, int);
 	//fprintf(stderr, "_dns_getaddrinfo() name = '%s'\n", name);
 
 	memset(&q, 0, sizeof(q));
@@ -1924,7 +1929,7 @@ _dns_getaddrinfo(void *rv, void	*cb_data, va_list ap)
 			// Only implement AI_ADDRCONFIG if the application is not
 			// using its own DNS servers, since our implementation
 			// only works on the default connection.
-			if (!_using_alt_dns()) {
+			if (_using_default_dns(iface)) {
 				query_ipv6 = _have_ipv6();
 				query_ipv4 = _have_ipv4();
 			}
@@ -1980,6 +1985,7 @@ _dns_getaddrinfo(void *rv, void	*cb_data, va_list ap)
 	 * and have a cache hit that would be wasted, so we do the rest there on miss
 	 */
 	res_setiface(res, iface);
+	res_setmark(res, mark);
 	if (res_searchN(name, &q, res) < 0) {
 		__res_put_state(res);
 		free(buf);
@@ -2310,6 +2316,12 @@ res_searchN(const char *name, struct res_target *target, res_state res)
 	    (dots && !trailing_dot && (res->options & RES_DNSRCH))) {
 		int done = 0;
 
+		/* Unfortunately we need to set stuff up before
+		 * the domain stuff is tried.  Will have a better
+		 * fix after thread pools are used.
+		 */
+		_resolv_populate_res_for_iface(res);
+
 		for (domain = (const char * const *)res->dnsrch;
 		   *domain && !done;
 		   domain++) {
diff --git a/libc/netbsd/net/getnameinfo.c b/libc/netbsd/net/getnameinfo.c
index ade5240..15d2675 100644
--- a/libc/netbsd/net/getnameinfo.c
+++ b/libc/netbsd/net/getnameinfo.c
@@ -93,7 +93,7 @@ struct sockinet {
 };
 
 static int getnameinfo_inet(const struct sockaddr *, socklen_t, char *,
-    socklen_t, char *, socklen_t, int, const char*);
+    socklen_t, char *, socklen_t, int, const char*, int);
 #ifdef INET6
 static int ip6_parsenumeric(const struct sockaddr *, const char *, char *,
 				 socklen_t, int);
@@ -108,16 +108,16 @@ static int getnameinfo_local(const struct sockaddr *, socklen_t, char *,
  */
 int getnameinfo(const struct sockaddr* sa, socklen_t salen, char* host, size_t hostlen, char* serv, size_t servlen, int flags)
 {
-	return android_getnameinfoforiface(sa, salen, host, hostlen, serv, servlen, flags, NULL);
+	return android_getnameinfoforiface(sa, salen, host, hostlen, serv, servlen, flags, NULL, 0);
 }
 
-int android_getnameinfoforiface(const struct sockaddr* sa, socklen_t salen, char* host, size_t hostlen, char* serv, size_t servlen, int flags, const char* iface)
+int android_getnameinfoforiface(const struct sockaddr* sa, socklen_t salen, char* host, size_t hostlen, char* serv, size_t servlen, int flags, const char* iface, int mark)
 {
 	switch (sa->sa_family) {
 	case AF_INET:
 	case AF_INET6:
 		return getnameinfo_inet(sa, salen, host, hostlen,
-				serv, servlen, flags, iface);
+				serv, servlen, flags, iface, mark);
 	case AF_LOCAL:
 		return getnameinfo_local(sa, salen, host, hostlen,
 		    serv, servlen, flags);
@@ -158,10 +158,10 @@ getnameinfo_local(const struct sockaddr *sa, socklen_t salen,
  * the address. On failure -1 is returned in which case
  * normal execution flow shall continue. */
 static int
-android_gethostbyaddr_proxy(char* nameBuf, size_t nameBufLen, const void *addr, socklen_t addrLen, int addrFamily, const char* iface)
+android_gethostbyaddr_proxy(char* nameBuf, size_t nameBufLen, const void *addr, socklen_t addrLen, int addrFamily, const char* iface, int mark)
 {
 	struct hostent *hostResult =
-			android_gethostbyaddrforiface_proxy(addr, addrLen, addrFamily, iface);
+			android_gethostbyaddrforiface_proxy(addr, addrLen, addrFamily, iface, mark);
 
 	if (hostResult == NULL) return 0;
 
@@ -179,7 +179,7 @@ static int
 getnameinfo_inet(const struct sockaddr* sa, socklen_t salen,
        char *host, socklen_t hostlen,
        char *serv, socklen_t servlen,
-       int flags, const char* iface)
+       int flags, const char* iface, int mark)
 {
 	const struct afd *afd;
 	struct servent *sp;
@@ -321,14 +321,15 @@ getnameinfo_inet(const struct sockaddr* sa, socklen_t salen,
 		char android_proxy_buf[MAXDNAME];
 
 		int hostnamelen = android_gethostbyaddr_proxy(android_proxy_buf,
-				MAXDNAME, addr, afd->a_addrlen, afd->a_af, iface);
+				MAXDNAME, addr, afd->a_addrlen, afd->a_af, iface, mark);
 		if (hostnamelen > 0) {
 			hp = &android_proxy_hostent;
 			hp->h_name = android_proxy_buf;
 		} else if (!hostnamelen) {
 			hp = NULL;
 		} else {
-			hp = android_gethostbyaddrforiface(addr, afd->a_addrlen, afd->a_af, iface);
+			hp = android_gethostbyaddrforiface(addr, afd->a_addrlen, afd->a_af,
+					iface, mark);
 		}
 
 		if (hp) {
diff --git a/libc/netbsd/net/reentrant.h b/libc/netbsd/net/reentrant.h
index 15507eb..60bff08 100644
--- a/libc/netbsd/net/reentrant.h
+++ b/libc/netbsd/net/reentrant.h
@@ -102,6 +102,7 @@
 
 #include <pthread.h>
 #include <signal.h>
+#include <sys/cdefs.h>
 
 #define	mutex_t			pthread_mutex_t
 #define	MUTEX_INITIALIZER	PTHREAD_MUTEX_INITIALIZER
diff --git a/libc/netbsd/resolv/res_cache.c b/libc/netbsd/resolv/res_cache.c
index 829bf10..8a6dc83 100644
--- a/libc/netbsd/resolv/res_cache.c
+++ b/libc/netbsd/resolv/res_cache.c
@@ -1258,6 +1258,12 @@ typedef struct resolv_pidiface_info {
     char                            ifname[IF_NAMESIZE + 1];
     struct resolv_pidiface_info*    next;
 } PidIfaceInfo;
+typedef struct resolv_uidiface_info {
+    int                             uid_start;
+    int                             uid_end;
+    char                            ifname[IF_NAMESIZE + 1];
+    struct resolv_uidiface_info*    next;
+} UidIfaceInfo;
 
 #define  HTABLE_VALID(x)  ((x) != NULL && (x) != HTABLE_DELETED)
 
@@ -1796,6 +1802,9 @@ static struct resolv_cache_info _res_cache_list;
 // List of pid iface pairs
 static struct resolv_pidiface_info _res_pidiface_list;
 
+// List of uid iface pairs
+static struct resolv_uidiface_info _res_uidiface_list;
+
 // name of the current default inteface
 static char            _res_default_ifname[IF_NAMESIZE + 1];
 
@@ -1805,6 +1814,9 @@ static pthread_mutex_t _res_cache_list_lock;
 // lock protecting the _res_pid_iface_list
 static pthread_mutex_t _res_pidiface_list_lock;
 
+// lock protecting the _res_uidiface_list
+static pthread_mutex_t _res_uidiface_list_lock;
+
 /* lookup the default interface name */
 static char *_get_default_iface_locked();
 /* find the first cache that has an associated interface and return the name of the interface */
@@ -1833,12 +1845,19 @@ static struct in_addr* _get_addr_locked(const char * ifname);
 /* return 1 if the provided list of name servers differs from the list of name servers
  * currently attached to the provided cache_info */
 static int _resolv_is_nameservers_equal_locked(struct resolv_cache_info* cache_info,
-        char** servers, int numservers);
+        const char** servers, int numservers);
 /* remove a resolv_pidiface_info structure from _res_pidiface_list */
 static void _remove_pidiface_info_locked(int pid);
 /* get a resolv_pidiface_info structure from _res_pidiface_list with a certain pid */
 static struct resolv_pidiface_info* _get_pid_iface_info_locked(int pid);
 
+/* remove a resolv_pidiface_info structure from _res_uidiface_list */
+static int _remove_uidiface_info_locked(int uid_start, int uid_end);
+/* check if a range [low,high] overlaps with any already existing ranges in the uid=>iface map*/
+static int  _resolv_check_uid_range_overlap_locked(int uid_start, int uid_end);
+/* get a resolv_uidiface_info structure from _res_uidiface_list with a certain uid */
+static struct resolv_uidiface_info* _get_uid_iface_info_locked(int uid);
+
 static void
 _res_cache_init(void)
 {
@@ -1852,8 +1871,10 @@ _res_cache_init(void)
     memset(&_res_default_ifname, 0, sizeof(_res_default_ifname));
     memset(&_res_cache_list, 0, sizeof(_res_cache_list));
     memset(&_res_pidiface_list, 0, sizeof(_res_pidiface_list));
+    memset(&_res_uidiface_list, 0, sizeof(_res_uidiface_list));
     pthread_mutex_init(&_res_cache_list_lock, NULL);
     pthread_mutex_init(&_res_pidiface_list_lock, NULL);
+    pthread_mutex_init(&_res_uidiface_list_lock, NULL);
 }
 
 struct resolv_cache*
@@ -2076,7 +2097,7 @@ _resolv_set_default_iface(const char* ifname)
 }
 
 void
-_resolv_set_nameservers_for_iface(const char* ifname, char** servers, int numservers,
+_resolv_set_nameservers_for_iface(const char* ifname, const char** servers, int numservers,
         const char *domains)
 {
     int i, rt, index;
@@ -2149,7 +2170,7 @@ _resolv_set_nameservers_for_iface(const char* ifname, char** servers, int numser
 
 static int
 _resolv_is_nameservers_equal_locked(struct resolv_cache_info* cache_info,
-        char** servers, int numservers)
+        const char** servers, int numservers)
 {
     int i;
     char** ns;
@@ -2271,8 +2292,8 @@ _resolv_set_addr_of_iface(const char* ifname, struct in_addr* addr)
         memcpy(&cache_info->ifaddr, addr, sizeof(*addr));
 
         if (DEBUG) {
-            char* addr_s = inet_ntoa(cache_info->ifaddr);
-            XLOG("address of interface %s is %s\n", ifname, addr_s);
+            XLOG("address of interface %s is %s\n",
+                    ifname, inet_ntoa(cache_info->ifaddr));
         }
     }
     pthread_mutex_unlock(&_res_cache_list_lock);
@@ -2411,33 +2432,188 @@ _resolv_get_pids_associated_interface(int pid, char* buff, int buffLen)
     return len;
 }
 
+static int
+_remove_uidiface_info_locked(int uid_start, int uid_end) {
+    struct resolv_uidiface_info* result = _res_uidiface_list.next;
+    struct resolv_uidiface_info* prev = &_res_uidiface_list;
+
+    while (result != NULL && result->uid_start != uid_start && result->uid_end != uid_end) {
+        prev = result;
+        result = result->next;
+    }
+    if (prev != NULL && result != NULL) {
+        prev->next = result->next;
+        free(result);
+        return 0;
+    }
+    errno = EINVAL;
+    return -1;
+}
+
+static struct resolv_uidiface_info*
+_get_uid_iface_info_locked(int uid)
+{
+    struct resolv_uidiface_info* result = _res_uidiface_list.next;
+    while (result != NULL && !(result->uid_start <= uid && result->uid_end >= uid)) {
+        result = result->next;
+    }
+
+    return result;
+}
+
+static int
+_resolv_check_uid_range_overlap_locked(int uid_start, int uid_end)
+{
+    struct resolv_uidiface_info* cur = _res_uidiface_list.next;
+    while (cur != NULL) {
+        if (cur->uid_start <= uid_end && cur->uid_end >= uid_start) {
+            return -1;
+        }
+        cur = cur->next;
+    }
+    return 0;
+}
+
+void
+_resolv_clear_iface_uid_range_mapping()
+{
+    pthread_once(&_res_cache_once, _res_cache_init);
+    pthread_mutex_lock(&_res_uidiface_list_lock);
+    struct resolv_uidiface_info *current = _res_uidiface_list.next;
+    struct resolv_uidiface_info *next;
+    while (current != NULL) {
+        next = current->next;
+        free(current);
+        current = next;
+    }
+    _res_uidiface_list.next = NULL;
+    pthread_mutex_unlock(&_res_uidiface_list_lock);
+}
+
+void
+_resolv_clear_iface_pid_mapping()
+{
+    pthread_once(&_res_cache_once, _res_cache_init);
+    pthread_mutex_lock(&_res_pidiface_list_lock);
+    struct resolv_pidiface_info *current = _res_pidiface_list.next;
+    struct resolv_pidiface_info *next;
+    while (current != NULL) {
+        next = current->next;
+        free(current);
+        current = next;
+    }
+    _res_pidiface_list.next = NULL;
+    pthread_mutex_unlock(&_res_pidiface_list_lock);
+}
+
 int
-_resolv_get_default_iface(char* buff, int buffLen)
+_resolv_set_iface_for_uid_range(const char* ifname, int uid_start, int uid_end)
+{
+    int rv = 0;
+    struct resolv_uidiface_info* uidiface_info;
+    // make sure the uid iface list is created
+    pthread_once(&_res_cache_once, _res_cache_init);
+    if (uid_start > uid_end) {
+        errno = EINVAL;
+        return -1;
+    }
+    pthread_mutex_lock(&_res_uidiface_list_lock);
+    //check that we aren't adding an overlapping range
+    if (!_resolv_check_uid_range_overlap_locked(uid_start, uid_end)) {
+        uidiface_info = calloc(sizeof(*uidiface_info), 1);
+        if (uidiface_info) {
+            uidiface_info->uid_start = uid_start;
+            uidiface_info->uid_end = uid_end;
+            int len = sizeof(uidiface_info->ifname);
+            strncpy(uidiface_info->ifname, ifname, len - 1);
+            uidiface_info->ifname[len - 1] = '\0';
+
+            uidiface_info->next = _res_uidiface_list.next;
+            _res_uidiface_list.next = uidiface_info;
+
+            XLOG("_resolv_set_iface_for_uid_range: [%d,%d], iface %s\n", uid_start, uid_end,
+                    ifname);
+        } else {
+            XLOG("_resolv_set_iface_for_uid_range failing calloc\n");
+            rv = -1;
+            errno = EINVAL;
+        }
+    } else {
+        XLOG("_resolv_set_iface_for_uid_range range [%d,%d] overlaps\n", uid_start, uid_end);
+        rv = -1;
+        errno = EINVAL;
+    }
+
+    pthread_mutex_unlock(&_res_uidiface_list_lock);
+    return rv;
+}
+
+int
+_resolv_clear_iface_for_uid_range(int uid_start, int uid_end)
+{
+    pthread_once(&_res_cache_once, _res_cache_init);
+    pthread_mutex_lock(&_res_uidiface_list_lock);
+
+    int rv = _remove_uidiface_info_locked(uid_start, uid_end);
+
+    XLOG("_resolv_clear_iface_for_uid_range: [%d,%d]\n", uid_start, uid_end);
+
+    pthread_mutex_unlock(&_res_uidiface_list_lock);
+
+    return rv;
+}
+
+int
+_resolv_get_uids_associated_interface(int uid, char* buff, int buffLen)
 {
-    char* ifname;
     int len = 0;
 
-    if (!buff || buffLen == 0) {
+    if (!buff) {
         return -1;
     }
 
     pthread_once(&_res_cache_once, _res_cache_init);
+    pthread_mutex_lock(&_res_uidiface_list_lock);
+
+    struct resolv_uidiface_info* uidiface_info = _get_uid_iface_info_locked(uid);
+    buff[0] = '\0';
+    if (uidiface_info) {
+        len = strlen(uidiface_info->ifname);
+        if (len < buffLen) {
+            strncpy(buff, uidiface_info->ifname, len);
+            buff[len] = '\0';
+        }
+    }
+
+    XLOG("_resolv_get_uids_associated_interface buff: %s\n", buff);
+
+    pthread_mutex_unlock(&_res_uidiface_list_lock);
+
+    return len;
+}
+
+size_t
+_resolv_get_default_iface(char* buff, size_t buffLen)
+{
+    if (!buff || buffLen == 0) {
+        return 0;
+    }
+
+    pthread_once(&_res_cache_once, _res_cache_init);
     pthread_mutex_lock(&_res_cache_list_lock);
 
-    ifname = _get_default_iface_locked(); // never null, but may be empty
+    char* ifname = _get_default_iface_locked(); // never null, but may be empty
 
-    // if default interface not set. Get first cache with an interface
+    // if default interface not set give up.
     if (ifname[0] == '\0') {
-        ifname = _find_any_iface_name_locked(); // may be null
+        pthread_mutex_unlock(&_res_cache_list_lock);
+        return 0;
     }
 
-    // if we got the default iface or if (no-default) the find_any call gave an answer
-    if (ifname) {
-        len = strlen(ifname);
-        if (len < buffLen) {
-            strncpy(buff, ifname, len);
-            buff[len] = '\0';
-        }
+    size_t len = strlen(ifname);
+    if (len < buffLen) {
+        strncpy(buff, ifname, len);
+        buff[len] = '\0';
     } else {
         buff[0] = '\0';
     }
@@ -2447,28 +2623,32 @@ _resolv_get_default_iface(char* buff, int buffLen)
     return len;
 }
 
-int
+void
 _resolv_populate_res_for_iface(res_state statp)
 {
-    int nserv;
-    struct resolv_cache_info* info = NULL;
-
-    if (statp) {
-        struct addrinfo* ai;
+    if (statp == NULL) {
+        return;
+    }
 
-        if (statp->iface[0] == '\0') { // no interface set assign default
-            _resolv_get_default_iface(statp->iface, sizeof(statp->iface));
+    if (statp->iface[0] == '\0') { // no interface set assign default
+        size_t if_len = _resolv_get_default_iface(statp->iface, sizeof(statp->iface));
+        if (if_len + 1 > sizeof(statp->iface)) {
+            XLOG("%s: INTERNAL_ERROR: can't fit interface name into statp->iface.\n", __FUNCTION__);
+            return;
         }
-
-        pthread_once(&_res_cache_once, _res_cache_init);
-        pthread_mutex_lock(&_res_cache_list_lock);
-        info = _find_cache_info_locked(statp->iface);
-
-        if (info == NULL) {
-            pthread_mutex_unlock(&_res_cache_list_lock);
-            return 0;
+        if (if_len == 0) {
+            XLOG("%s: INTERNAL_ERROR: can't find any suitable interfaces.\n", __FUNCTION__);
+            return;
         }
+    }
 
+    pthread_once(&_res_cache_once, _res_cache_init);
+    pthread_mutex_lock(&_res_cache_list_lock);
+
+    struct resolv_cache_info* info = _find_cache_info_locked(statp->iface);
+    if (info != NULL) {
+        int nserv;
+        struct addrinfo* ai;
         XLOG("_resolv_populate_res_for_iface: %s\n", statp->iface);
         for (nserv = 0; nserv < MAXNS; nserv++) {
             ai = info->nsaddrinfo[nserv];
@@ -2502,8 +2682,6 @@ _resolv_populate_res_for_iface(res_state statp)
         while (pp < statp->dnsrch + MAXDNSRCH && *p != -1) {
             *pp++ = &statp->defdname + *p++;
         }
-
-        pthread_mutex_unlock(&_res_cache_list_lock);
     }
-    return nserv;
+    pthread_mutex_unlock(&_res_cache_list_lock);
 }
diff --git a/libc/netbsd/resolv/res_init.c b/libc/netbsd/resolv/res_init.c
index ff65299..ceb412b 100644
--- a/libc/netbsd/resolv/res_init.c
+++ b/libc/netbsd/resolv/res_init.c
@@ -806,4 +806,11 @@ void res_setiface(res_state statp, const char* iface)
 		}
 	}
 }
+
+void res_setmark(res_state statp, int mark)
+{
+	if (statp != NULL) {
+		statp->_mark = mark;
+	}
+}
 #endif /* ANDROID_CHANGES */
diff --git a/libc/netbsd/resolv/res_send.c b/libc/netbsd/resolv/res_send.c
index d407ac8..f65b015 100644
--- a/libc/netbsd/resolv/res_send.c
+++ b/libc/netbsd/resolv/res_send.c
@@ -581,8 +581,8 @@ res_nsend(res_state statp,
 			if (n == 0)
 				goto next_ns;
 			if (DBG) {
-				__libc_format_log(ANDROID_LOG_DEBUG, "libc",
-					"time=%d, %d\n",time(NULL), time(NULL)%2);
+				__libc_format_log(ANDROID_LOG_DEBUG, "libc", "time=%ld\n",
+                                                  time(NULL));
 			}
 			if (v_circuit)
 				goto same_ns;
@@ -762,10 +762,13 @@ send_vc(res_state statp,
 	if (statp->_vcsock >= 0 && (statp->_flags & RES_F_VC) != 0) {
 		struct sockaddr_storage peer;
 		socklen_t size = sizeof peer;
-
+		int old_mark;
+		int mark_size = sizeof(old_mark);
 		if (getpeername(statp->_vcsock,
 				(struct sockaddr *)(void *)&peer, &size) < 0 ||
-		    !sock_eq((struct sockaddr *)(void *)&peer, nsap)) {
+		    !sock_eq((struct sockaddr *)(void *)&peer, nsap) ||
+			getsockopt(statp->_vcsock, SOL_SOCKET, SO_MARK, &old_mark, &mark_size) < 0 ||
+			old_mark != statp->_mark) {
 			res_nclose(statp);
 			statp->_flags &= ~RES_F_VC;
 		}
@@ -795,6 +798,14 @@ send_vc(res_state statp,
 				return (-1);
 			}
 		}
+		if (statp->_mark != 0) {
+			if (setsockopt(statp->_vcsock, SOL_SOCKET,
+				        SO_MARK, &statp->_mark, sizeof(statp->_mark)) < 0) {
+				*terrno = errno;
+				Perror(statp, stderr, "setsockopt", errno);
+				return -1;
+			}
+		}
 		errno = 0;
 		if (random_bind(statp->_vcsock,nsap->sa_family) < 0) {
 			*terrno = errno;
@@ -961,7 +972,7 @@ done:
 	fcntl(sock, F_SETFL, origflags);
 	if (DBG) {
 		__libc_format_log(ANDROID_LOG_DEBUG, "libc",
-			"  %d connect_with_timeout returning %s\n", sock, res);
+			"  %d connect_with_timeout returning %d\n", sock, res);
 	}
 	return res;
 }
@@ -1025,7 +1036,7 @@ retry:
 	}
 	if (DBG) {
 		__libc_format_log(ANDROID_LOG_DEBUG, "libc",
-			"  %d retrying_select returning %d for %d\n",sock, n);
+			"  %d retrying_select returning %d\n",sock, n);
 	}
 
 	return n;
@@ -1070,6 +1081,14 @@ send_dg(res_state statp,
 				return (-1);
 			}
 		}
+
+		if (statp->_mark != 0) {
+			if (setsockopt(EXT(statp).nssocks[ns], SOL_SOCKET,
+					SO_MARK, &(statp->_mark), sizeof(statp->_mark)) < 0) {
+				res_nclose(statp);
+				return -1;
+			}
+		}
 #ifndef CANNOT_CONNECT_DGRAM
 		/*
 		 * On a 4.3BSD+ machine (client and server,
@@ -1097,6 +1116,7 @@ send_dg(res_state statp,
 #endif /* !CANNOT_CONNECT_DGRAM */
 		Dprint(statp->options & RES_DEBUG,
 		       (stdout, ";; new DG socket\n"))
+
 	}
 	s = EXT(statp).nssocks[ns];
 #ifndef CANNOT_CONNECT_DGRAM
diff --git a/libc/netbsd/resolv/res_state.c b/libc/netbsd/resolv/res_state.c
index 32ffdca..de82e1a 100644
--- a/libc/netbsd/resolv/res_state.c
+++ b/libc/netbsd/resolv/res_state.c
@@ -71,7 +71,7 @@ _res_thread_alloc(void)
         rt->_serial = 0;
         rt->_pi = (struct prop_info*) __system_property_find("net.change");
         if (rt->_pi) {
-            rt->_serial = rt->_pi->serial;
+            rt->_serial = __system_property_serial(rt->_pi);
         }
         memset(rt->_rstatic, 0, sizeof rt->_rstatic);
     }
@@ -135,14 +135,14 @@ _res_thread_get(void)
                 return rt;
             }
         }
-        if (rt->_serial == rt->_pi->serial) {
+        if (rt->_serial == __system_property_serial(rt->_pi)) {
             /* Nothing changed, so return the current state */
             D("%s: tid=%d rt=%p nothing changed, returning",
               __FUNCTION__, gettid(), rt);
             return rt;
         }
         /* Update the recorded serial number, and go reset the state */
-        rt->_serial = rt->_pi->serial;
+        rt->_serial = __system_property_serial(rt->_pi);
         goto RESET_STATE;
     }