packet

问题 Need help to parse mealtype on glucometer android BLE. https://github.com/oesmith/gatt-xml/blob/master/org.bluetooth.characteristic.glucose_measurement_context.xml Here's my data: [27, 5, 0, -28, 7, 8, 24, 17, 18, 41, -29, 1, 102, -80, -8, 0, 0] I also found this one: C3: Field exists if the key of bit 1 of the Flags field is set to 1 Here's my enum public static Meal from(final int code) { switch (code) { case 1: return PREPRANDIAL; case 2: return POSTPRANDIAL; case 3: return FASTING; case 4

问题 in r8169 driver from realtek it does rx_buf = page_address(tp->Rx_databuff[entry]); dma_sync_single_for_cpu(d, addr, pkt_size, DMA_FROM_DEVICE); prefetch(rx_buf); skb_copy_to_linear_data(skb, rx_buf, pkt_size);<----//Do I get packet at this???? skb->tail += pkt_size; skb->len = pkt_size; dma_sync_single_for_device(d, addr, pkt_size, DMA_FROM_DEVICE); //csum... skb->protocol = eth_type_trans(skb, dev); napi_gro_receive(&tp->napi, skb); this is inside rtl_rx function called from poll of driver.

问题 in r8169 driver from realtek it does rx_buf = page_address(tp->Rx_databuff[entry]); dma_sync_single_for_cpu(d, addr, pkt_size, DMA_FROM_DEVICE); prefetch(rx_buf); skb_copy_to_linear_data(skb, rx_buf, pkt_size);<----//Do I get packet at this???? skb->tail += pkt_size; skb->len = pkt_size; dma_sync_single_for_device(d, addr, pkt_size, DMA_FROM_DEVICE); //csum... skb->protocol = eth_type_trans(skb, dev); napi_gro_receive(&tp->napi, skb); this is inside rtl_rx function called from poll of driver.

问题 I'm creating application based on ToyVPN to capture tcp/udp packets. After i get outgoing packets in my apllication i would like to forward them to original destination. I have managed to get destination ip and port from headers but i have no idea how to communicate with remote server and then write response back to the source. I think this is possible because there is this app. Here is my first first attempt: private void runVpnConnection() throws Exception { configure(); FileInputStream in

问题 I'm creating application based on ToyVPN to capture tcp/udp packets. After i get outgoing packets in my apllication i would like to forward them to original destination. I have managed to get destination ip and port from headers but i have no idea how to communicate with remote server and then write response back to the source. I think this is possible because there is this app. Here is my first first attempt: private void runVpnConnection() throws Exception { configure(); FileInputStream in

问题 Minecraft is a game which also can be played on multiplayer servers. Each server has its own IP and the port is for every server "25565". In generell, for this problem you should be familiar with Minecaft protocol(https://wiki.vg/Protocol#Login_Start). Even if not, I created a hyperlink where you can look for this. My goal is to create a Minecraft Chatbot, without even open Minecraftlauncher to join any server. I know, there are already a lot of these existing, but I want to create some new

问题 I am developing a firewall application in android where I need to identify apps based on uid. I have created a vpn service and I am able to capture packets and get destination ip address. Is there any way to get uid of apps from packets or datagram sockets. 回答1: Parse the packet, for TCP/UDP, you can retrieve the (local_ip, local_port, remote_ip, remote_port) tuple. Then read and parse /proc/net/tcp or /proc/net/udp, there's uid field in it. This is a loopback socket whose owner uid is 10117:

问题 I've managed to create a number of routing nodes as described in this tutorial: https://inet.omnetpp.org/docs/tutorials/wireless/doc/step3.html They work as expected (forward packets in between nodes) but there's a problem in that these packets don't make it past the transport layer. Looking at Packet.h (inet): // // Implements the IPv4 protocol. The protocol header is represented // by the ~Ipv4Header message class. // // <b>Interfacing with higher layer protocols</b> // // To send a packet

来源： https://stackoverflow.com/questions/23373764/udp-optional-checksum

来源： https://stackoverflow.com/questions/23373764/udp-optional-checksum