From 5dc503314511f3041b4674569ba03c10714f7625 Mon Sep 17 00:00:00 2001
From: Arne Schwabe <arne@rfc2549.org>
Date: Wed, 26 Nov 2014 00:04:25 +0100
Subject: Implement getting local interfaces via native API and without
 OpenVPN.

Fixes allow local LAN on Android 5.0

--HG--
extra : rebase_source : ac79c41800905f3aeb23ce49a617ab226a6473c0
---
 main/jni/scan_ifs.c | 109 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 109 insertions(+)
 create mode 100644 main/jni/scan_ifs.c

(limited to 'main/jni/scan_ifs.c')

diff --git a/main/jni/scan_ifs.c b/main/jni/scan_ifs.c
new file mode 100644
index 00000000..e0024c54
--- /dev/null
+++ b/main/jni/scan_ifs.c
@@ -0,0 +1,109 @@
+#include <jni.h>
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <sys/ioctl.h>
+#include <linux/if.h>
+#include <android/log.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdio.h>
+#include <errno.h>
+
+#include "jniglue.h"
+
+jobjectArray Java_de_blinkt_openvpn_core_NativeUtils_getIfconfig(JNIEnv* env)
+{
+
+	int sd;
+    if ((sd = socket (AF_INET, SOCK_DGRAM, 0)) < 0) {
+        __android_log_print(ANDROID_LOG_DEBUG, "openvpn", "Opening socket for intface get failed");
+        //jniThrowException(env, "java/lang/IllegalArgumentException", "Opening socket for intface get failed");
+        return NULL;
+    }
+
+    struct ifreq ifs[23];
+
+    struct ifconf ifc;  
+    ifc.ifc_req = ifs;
+    ifc.ifc_len = sizeof (ifs);
+
+    if (ioctl (sd, SIOCGIFCONF, &ifc) < 0) {
+        __android_log_print(ANDROID_LOG_DEBUG, "openvpn", "IOCTL for intface get failed");
+        //jniThrowException(env, "java/lang/IllegalArgumentException", "IOTCL socket for intface get failed");
+        return NULL;
+    }
+    
+
+    
+
+    char buf[NI_MAXHOST];
+    
+    int ji=0;
+    
+    /*
+    jtmp = (*env)->NewStringUTF(env, "HALLO WELT");
+    (*env)->SetObjectArrayElement(env, ret, ji++, jtmp);
+    */
+
+    size_t num_intf=ifc.ifc_len / sizeof(struct ifreq);
+    jobjectArray ret= (jobjectArray) (*env)->NewObjectArray(env, num_intf*3,(*env)->FindClass(env, "java/lang/String"), NULL);
+
+    for (struct ifreq* ifr = ifc.ifc_req; ifr <   ifs + num_intf; ifr++) {
+        
+        if (ifr->ifr_addr.sa_family != AF_INET)  {
+            __android_log_print(ANDROID_LOG_DEBUG, "openvpn", "NOT AF_INET: %s", ifr->ifr_name);
+            continue;
+        }
+        
+        /* get interface addr, prefilled by SIOGIFCONF */
+        
+        int err;
+        if (err=getnameinfo(&ifr->ifr_addr, sizeof(struct sockaddr_in), buf, NI_MAXHOST, NULL, 0,
+                                NI_NUMERICHOST) !=0) {
+            __android_log_print(ANDROID_LOG_DEBUG, "openvpn", "getnameinfo failed for  %s: %s", ifr->ifr_name,  gai_strerror(err));
+            continue;
+        }
+        jstring jaddr = (*env)->NewStringUTF(env, buf);
+        jstring jname = (*env)->NewStringUTF(env, ifr->ifr_name);
+            
+
+        struct ifreq ifreq;
+        strncpy (ifreq.ifr_name, ifr->ifr_name, sizeof (ifreq.ifr_name));
+
+        /* interface is up */
+        if (ioctl (sd, SIOCGIFFLAGS, &ifreq) < 0) {
+            __android_log_print(ANDROID_LOG_DEBUG, "openvpn", "SIOCGIFFLAGS failed for %s: %s", ifr->ifr_name, strerror(errno));
+            continue;
+        }
+        
+        if (!(ifreq.ifr_flags & IFF_UP)) {
+            __android_log_print(ANDROID_LOG_DEBUG, "openvpn", "IFF_UP failed for %s", ifr->ifr_name);
+            continue;
+        }
+
+        /* interface netmask */
+        if (ioctl (sd, SIOCGIFNETMASK, &ifreq) < 0) {
+            __android_log_print(ANDROID_LOG_DEBUG, "openvpn", "SIOCIFNETMASK failed for %s: %s", ifr->ifr_name, strerror(errno));
+            continue;
+        }
+       
+        if (err=getnameinfo(&ifreq.ifr_netmask, sizeof(struct sockaddr_in), buf, NI_MAXHOST, NULL, 0,
+                                NI_NUMERICHOST) !=0) {
+            __android_log_print(ANDROID_LOG_DEBUG, "openvpn", "getnameinfo failed for  %s: %s", ifr->ifr_name,  gai_strerror(err));
+            continue;
+        }
+        jstring jnetmask = (*env)->NewStringUTF(env, buf);
+        
+        (*env)->SetObjectArrayElement(env, ret, ji++, jname);
+        (*env)->SetObjectArrayElement(env, ret, ji++, jaddr);
+        (*env)->SetObjectArrayElement(env, ret, ji++, jnetmask);
+    }
+    if (sd >= 0)
+        close (sd);
+    
+    return ret;
+}
+
-- 
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