// Server side implementation of UDP client-server model
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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 <string.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include <signal.h>
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#define PORT 8080
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#define MAXLINE 1024
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bool stop = false;
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static void stop_handler(int sig) {
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printf("stop_handler\n");
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stop = true;
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}
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// Driver code
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int main() {
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int sockfd;
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char buffer[MAXLINE];
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char *hello = "Hello from server";
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struct sockaddr_in servaddr, cliaddr;
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signal(SIGINT, stop_handler);
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// Creating socket file descriptor
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if ( (sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0 ) {
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perror("socket creation failed");
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exit(EXIT_FAILURE);
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}
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memset(&servaddr, 0, sizeof(servaddr));
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memset(&cliaddr, 0, sizeof(cliaddr));
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// Filling server information
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servaddr.sin_family = AF_INET; // IPv4
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servaddr.sin_addr.s_addr = INADDR_ANY;
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servaddr.sin_port = htons(PORT);
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// Bind the socket with the server address
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if ( bind(sockfd, (const struct sockaddr *)&servaddr,
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sizeof(servaddr)) < 0 )
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{
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perror("bind failed");
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exit(EXIT_FAILURE);
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}
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int n;
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socklen_t len = sizeof(cliaddr); //len is value/resuslt
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while(!stop) {
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n = recvfrom(sockfd, (char *)buffer, MAXLINE,
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MSG_WAITALL, ( struct sockaddr *) &cliaddr,
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&len);
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buffer[n] = '\0';
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printf("Client : %s\n", buffer);
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sendto(sockfd, (const char *)hello, strlen(hello),
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MSG_CONFIRM, (const struct sockaddr *) &cliaddr,
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len);
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printf("Hello message sent.\n");
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}
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printf("===stopted.\n");
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return 0;
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}
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