return NULL;
}
+static bool sendBE32(SocketClient* c, uint32_t data) {
+ uint32_t be_data = htonl(data);
+ return c->sendData(&be_data, sizeof(be_data)) == 0;
+}
+
// Sends 4 bytes of big-endian length, followed by the data.
// Returns true on success.
-static bool sendLenAndData(SocketClient *c, const int len, const void* data) {
- uint32_t len_be = htonl(len);
- return c->sendData(&len_be, 4) == 0 &&
- (len == 0 || c->sendData(data, len) == 0);
+static bool sendLenAndData(SocketClient* c, const int len, const void* data) {
+ return sendBE32(c, len) && (len == 0 || c->sendData(data, len) == 0);
}
// Returns true on success
return success;
}
+static bool sendaddrinfo(SocketClient* c, struct addrinfo* ai) {
+ // struct addrinfo {
+ // int ai_flags; /* AI_PASSIVE, AI_CANONNAME, AI_NUMERICHOST */
+ // int ai_family; /* PF_xxx */
+ // int ai_socktype; /* SOCK_xxx */
+ // int ai_protocol; /* 0 or IPPROTO_xxx for IPv4 and IPv6 */
+ // socklen_t ai_addrlen; /* length of ai_addr */
+ // char *ai_canonname; /* canonical name for hostname */
+ // struct sockaddr *ai_addr; /* binary address */
+ // struct addrinfo *ai_next; /* next structure in linked list */
+ // };
+
+ // Write the struct piece by piece because we might be a 64-bit netd
+ // talking to a 32-bit process.
+ bool success =
+ sendBE32(c, ai->ai_flags) &&
+ sendBE32(c, ai->ai_family) &&
+ sendBE32(c, ai->ai_socktype) &&
+ sendBE32(c, ai->ai_protocol);
+ if (!success) {
+ return false;
+ }
+
+ // ai_addrlen and ai_addr.
+ if (!sendLenAndData(c, ai->ai_addrlen, ai->ai_addr)) {
+ return false;
+ }
+
+ // strlen(ai_canonname) and ai_canonname.
+ if (!sendLenAndData(c, ai->ai_canonname ? strlen(ai->ai_canonname) + 1 : 0, ai->ai_canonname)) {
+ return false;
+ }
+
+ return true;
+}
+
void DnsProxyListener::GetAddrInfoHandler::run() {
if (DBG) {
ALOGD("GetAddrInfoHandler, now for %s / %s / %u / %u", mHost, mService, mNetId, mMark);
bool success = !mClient->sendCode(ResponseCode::DnsProxyQueryResult);
struct addrinfo* ai = result;
while (ai && success) {
- success = sendLenAndData(mClient, sizeof(struct addrinfo), ai)
- && sendLenAndData(mClient, ai->ai_addrlen, ai->ai_addr)
- && sendLenAndData(mClient,
- ai->ai_canonname ? strlen(ai->ai_canonname) + 1 : 0,
- ai->ai_canonname);
+ success = sendBE32(mClient, 1) && sendaddrinfo(mClient, ai);
ai = ai->ai_next;
}
- success = success && sendLenAndData(mClient, 0, "");
+ success = success && sendBE32(mClient, 0);
if (!success) {
ALOGW("Error writing DNS result to client");
}