mirror of https://github.com/M66B/NetGuard.git
53 lines
1.4 KiB
C
53 lines
1.4 KiB
C
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#include <jni.h>
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#include <stddef.h>
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#include <android/log.h>
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#include <netinet/ip.h>
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#include <netinet/ip6.h>
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#define TAG "NetGuard.JNI"
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JNIEXPORT void JNICALL
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Java_eu_faircode_netguard_SinkholeService_jni_1init(JNIEnv *env, jobject instance) {
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__android_log_print(ANDROID_LOG_INFO, TAG, "Init", 1);
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}
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JNIEXPORT void JNICALL
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Java_eu_faircode_netguard_SinkholeService_jni_1decode(JNIEnv *env, jobject instance,
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jbyteArray buffer_) {
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jbyte *buffer = (*env)->GetByteArrayElements(env, buffer_, NULL);
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jbyte version = (*buffer) >> 4;
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if (version == 4) {
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struct iphdr *ip4hdr = buffer;
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__android_log_print(ANDROID_LOG_INFO, TAG, "Version 4 protocol %d", ip4hdr->protocol);
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}
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else if (version == 6) {
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struct ip6_hdr *ip6hdr = buffer;
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__android_log_print(ANDROID_LOG_INFO, TAG, "Version 6 protocol %d", ip6hdr->ip6_nxt);
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}
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else
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__android_log_print(ANDROID_LOG_WARN, TAG, "Unknown version %d", version);
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(*env)->ReleaseByteArrayElements(env, buffer_, buffer, 0);
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}
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unsigned short checksum(unsigned short *addr, int len) {
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unsigned short result;
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unsigned int sum = 0;
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while (len > 1) {
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sum += *addr++;
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len -= 2;
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}
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if (len == 1)
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sum += *(unsigned char *) addr;
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sum = (sum >> 16) + (sum & 0xFFFF);
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sum += (sum >> 16);
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result = ~sum;
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return result;
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}
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