network-programming

问题 This works target.sin_addr.s_addr = inet_addr("127.0.0.1"); but I want to put the IP from a website URL I have tried const char host[] = "http://www.google.com/"; struct hostent *host_ip; host_ip = gethostbyaddr(host, strlen(host), 0); I of corse did WSAStartup before I used gethostbyaddr(); I've tried this target.sin_addr.s_addr = inet_addr(host_ip); I've tried a few simmilar ones too but it isn't working. Could someone show me how to do this correctly. Thank you! EDIT: When I do host_ip =

问题 when the send(or write) buffer is going to be full, let me say, only theres is only 500 bytes space. if I have a NONBLOCKING fd, and do n = send(fd, buf, 1000,0) here I wll get n<0, and I can get EWOULDBLOCK or EAGAIN error. my questions are: 1 here, the send write 500 bytes into the send buffer or 0 bytes to the send buffer? 2 if 500 bytes are sent to the buffer and if the fd is a UDP socket, then the datagram is split into 2 parts? 3 I need to use the fd to send many datagrams, if this time

问题 I have a service which as it's coming up invokes the Start() method on a TcpListener instance. This listener is using a port that is not common and not known to be used by any other services. Very very rarely for a span of minute or so it experiences an odd error. For a minute the service (which on failure restarts immediately) back to back crashes on the following exception: SocketException at System.Net.Sockets.Socket.DoBind(System.Net.EndPoint, System.Net.SocketAddress) at System.Net

问题 I'm writing a network client for a given protocol using TCP and I'm having having some philosophical issues with the overall architecture of the thing. Sometimes it may happen that I don't have the whole request data and I may need to read a few more bytes than what's available at the moment, and I imagine sometimes I can get parts of another request after the one I want. What's the usual approach in this kind of situations? 回答1: TCP sockets are Stream-Oriented. That means that reading them

问题 I have bacterial OTU table at all taxonomy levels. I want to plot network using igraph (or any other package). I have never created such plot so please if anyone know some tutorial link for beginner? OR If someone guide me with scripts, you time would be really appreciated. Thank you! 回答1: A relationship dataset in network analysis is made of, at least, one data.frame (or matrix) which describe the links and contains at least 2 cols, in order to indicate 'from' and 'to' link on the 2 first

问题 I'm writing a network client for a given protocol using TCP and I'm having having some philosophical issues with the overall architecture of the thing. Sometimes it may happen that I don't have the whole request data and I may need to read a few more bytes than what's available at the moment, and I imagine sometimes I can get parts of another request after the one I want. What's the usual approach in this kind of situations? 回答1: TCP sockets are Stream-Oriented. That means that reading them

问题 How can I get current network type? I found tis solution: val info = connectivityManager.activeNetworkInfo if (info == null || !info.isConnected()) return "-" // not connected if (info.getType() == ConnectivityManager.TYPE_WIFI) return "WIFI" if (info.getType() == ConnectivityManager.TYPE_MOBILE) { val networkType: Int = info.getSubtype() return when (networkType) { TelephonyManager.NETWORK_TYPE_GPRS, TelephonyManager.NETWORK_TYPE_EDGE, TelephonyManager.NETWORK_TYPE_CDMA, TelephonyManager

问题 I have a problem about 'binging a local port for a client tcp socket'. The code is as below: void tcpv4_cli_connect(const char *srvhost, in_port_t srvport, const char *clihost, in_port_t cliport) { struct sockaddr_in srvaddr, cliaddr; struct in_addr inaddr; int sockfd; bzero(&srvaddr, sizeof(srvaddr)); inet_aton(srvhost, &inaddr); srvaddr.sin_family = AF_INET; srvaddr.sin_addr = inaddr; srvaddr.sin_port = htons(srvport); bzero(&cliaddr, sizeof(cliaddr)); inet_aton(clihost, &inaddr); cliaddr

问题 I'm facing a problem: there is a need to create a simple firewall to cut unwanted packets directly on FPGA. Basically the idea is to have a shared table with rules. This table is meant to be accessed from FPGA to check whether to pass a packet or not and it's populated by an app from userspace. I've heard of DPDK project that can handle packet processing. But I couldn't find any info how to make it work on FPGA. Is it possible? Are there any recommendations on solving the problem? 回答1: DPDK

问题 Using nc, I was able to download one file with: GET /index.html HTTP/1.1 Host: {insert host name} But I can't figure out how to download multiple files in one request 来源： https://stackoverflow.com/questions/60562065/how-do-i-download-multiple-files-using-one-http-1-1-request