87 lines
2.1 KiB
C++
Executable File
87 lines
2.1 KiB
C++
Executable File
// UDP Server test program
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#define MAXBUF 1024*1024
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void echo(int sock) {
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char bufin[MAXBUF];
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struct sockaddr_in remote;
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int n;
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socklen_t len = sizeof(remote);
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long count = 0;
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while (1) {
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sleep(1);
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//usleep(50);
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count++;
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// read a datagram from the socket (put result in bufin)
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n=recvfrom(sock,bufin,MAXBUF,0,(struct sockaddr *)&remote,&len);
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// print out the address of the sender
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printf("DGRAM from %s:%d\n", inet_ntoa(remote.sin_addr), ntohs(remote.sin_port));
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if (n<0) {
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perror("Error receiving data");
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} else {
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printf("GOT %d BYTES (count = %ld)\n", n, count);
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// Got something, just send it back
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// sendto(sock,bufin,n,0,(struct sockaddr *)&remote,len);
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printf("RX = %s\n", bufin);
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}
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}
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}
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int main(int argc, char *argv[]) {
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if(argc < 2) {
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printf("usage: udp_server <port>\n");
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return 0;
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}
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int sock, port = atoi(argv[1]);
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socklen_t len;
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struct sockaddr_in skaddr;
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struct sockaddr_in skaddr2;
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// Create socket
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if ((sock = socket( PF_INET, SOCK_DGRAM, 0)) < 0) {
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printf("error creating socket\n");
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return 0;
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}
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// Create address
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skaddr.sin_family = AF_INET;
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skaddr.sin_addr.s_addr = htonl(INADDR_ANY);
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skaddr.sin_port = htons(port);
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// Bind to address
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if (bind(sock, (struct sockaddr *) &skaddr, sizeof(skaddr))<0) {
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printf("error binding\n");
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return 0;
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}
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// find out what port we were assigned
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len = sizeof( skaddr2 );
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//if (getsockname(sock, (struct sockaddr *) &skaddr2, &len)<0) {
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// printf("error getsockname\n");
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// return 0;
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//}
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// Display address:port to verify it was sent over RPC correctly
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/*
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port = ntohs(skaddr2.sin_port);
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int ip = skaddr2.sin_addr.s_addr;
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unsigned char d[4];
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d[0] = ip & 0xFF;
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d[1] = (ip >> 8) & 0xFF;
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d[2] = (ip >> 16) & 0xFF;
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d[3] = (ip >> 24) & 0xFF;
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printf("bound to address: %d.%d.%d.%d : %d\n", d[0],d[1],d[2],d[3], port);
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*/
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// RX
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echo(sock);
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return(0);
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}
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