96 lines
1.8 KiB
C
96 lines
1.8 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netdb.h>
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static int set_sock_opts(int sock)
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{
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struct timeval tv;
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int d = 1;
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memset(&tv, 0, sizeof(tv));
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tv.tv_sec = 2;
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setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO,
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&tv, sizeof(struct timeval));
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setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO,
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&tv, sizeof(struct timeval));
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return setsockopt(sock,SOL_SOCKET,SO_REUSEADDR, &d, sizeof(int));
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}
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bool Network::InitSockaddr (struct sockaddr_in *name,
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const char *hostname, uint16_t port)
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{
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struct hostent *hostinfo = gethostbyname (hostname);
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if (hostinfo == NULL)
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{
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fprintf (stderr, "Unknown host %s.\n", hostname);
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return false;
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}
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name->sin_family = AF_INET;
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name->sin_port = htons (port);
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name->sin_addr = *(struct in_addr *) hostinfo->h_addr;
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return true;
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}
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bool Network::InitSocket()
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{
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/* Create the socket. */
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this->sock = socket (PF_INET, SOCK_DGRAM, 0);
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if (this->sock < 0)
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{
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perror ("socket (client)");
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return false;
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}
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set_sock_opts(this->sock);
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return true;
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}
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ssize_t Network::ReceiveFrom(void *dst, int sock, size_t sz,
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struct sockaddr_in *from)
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{
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socklen_t from_sz = from ? sizeof(struct sockaddr_in) : 0;
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return recvfrom(sock, dst, sz, 0, (struct sockaddr*)from, &from_sz);
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}
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ssize_t Network::SendTo(void *src, int sock, size_t sz, struct sockaddr_in *to)
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{
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socklen_t to_sz = sizeof(struct sockaddr_in);
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assert(to);
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return sendto(sock, src, sz, 0, (struct sockaddr*)to, to_sz);
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}
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bool Network::Select(int sock, struct timeval *tv)
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{
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fd_set fds;
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int v;
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FD_ZERO(&fds);
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FD_SET(sock, &fds);
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v = select(sock + 1, &fds, NULL, NULL, tv);
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if (v < 0)
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{
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fprintf(stderr, "Select failed\n");
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return false;
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}
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/* v is 0 if the sock is not ready */
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return v > 0;
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}
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void Network::CloseSocket()
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{
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close(this->sock);
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}
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void Network::ShutdownNetwork()
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{
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} |