static bool modifyAddress(JNIEnv *env, jobject thiz, jstring jName, jstring jAddress,
jint jPrefixLength, bool add)
{
int error = SYSTEM_ERROR;
const char *name = jName ? env->GetStringUTFChars(jName, NULL) : NULL;
const char *address = jAddress ? env->GetStringUTFChars(jAddress, NULL) : NULL;
if (!name) {
jniThrowNullPointerException(env, "name");
} else if (!address) {
jniThrowNullPointerException(env, "address");
} else {
if (add) {
if (error = ifc_add_address(name, address, jPrefixLength)) {
ALOGE("Cannot add address %s/%d on interface %s (%s)", address, jPrefixLength, name,
strerror(-error));
}
} else {
if (error = ifc_del_address(name, address, jPrefixLength)) {
ALOGE("Cannot del address %s/%d on interface %s (%s)", address, jPrefixLength, name,
strerror(-error));
}
}
}
if (name) {
env->ReleaseStringUTFChars(jName, name);
}
if (address) {
env->ReleaseStringUTFChars(jAddress, address);
}
return !error;
}
/*
* Clears IPv6 addresses on the specified interface.
*/
int ifc_clear_ipv6_addresses(const char *name) {
char rawaddrstr[INET6_ADDRSTRLEN], addrstr[INET6_ADDRSTRLEN];
unsigned int prefixlen;
int lasterror = 0, i, j, ret;
char ifname[64]; // Currently, IFNAMSIZ = 16.
FILE *f = fopen("/proc/net/if_inet6", "r");
if (!f) {
return -errno;
}
// Format:
// 20010db8000a0001fc446aa4b5b347ed 03 40 00 01 wlan0
while (fscanf(f, "%32s %*02x %02x %*02x %*02x %63s\n",
rawaddrstr, &prefixlen, ifname) == 3) {
// Is this the interface we're looking for?
if (strcmp(name, ifname)) {
continue;
}
// Put the colons back into the address.
for (i = 0, j = 0; i < 32; i++, j++) {
addrstr[j] = rawaddrstr[i];
if (i % 4 == 3) {
addrstr[++j] = ':';
}
}
addrstr[j - 1] = '\0';
// Don't delete the link-local address as well, or it will disable IPv6
// on the interface.
if (strncmp(addrstr, "fe80:", 5) == 0) {
continue;
}
ret = ifc_del_address(ifname, addrstr, prefixlen);
if (ret) {
ALOGE("Deleting address %s/%d on %s: %s", addrstr, prefixlen, ifname,
strerror(-ret));
lasterror = ret;
}
}
fclose(f);
ALOGD("ifc_clear_ipv6_addresses return %d", lasterror);
return lasterror;
}
