85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
#include <arpa/inet.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <unistd.h>
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void handle_arguments(int argc, char *argv[]) {
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if (argc != 2) {
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fprintf(stderr, "Usage: %s PORT\n", argv[0]);
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exit(EXIT_FAILURE);
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}
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}
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void send_integers(int sockfd, struct sockaddr_in * server_addr) {
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int buffer = 42;
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while (1) {
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// int rv = sendto(sockfd, buffer.array, sizeof(buffer), 0, (const struct sockaddr *)&server_addr, sizeof(server_addr));
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int rv = sendto(sockfd, &buffer, sizeof(buffer), 0, (const struct sockaddr *)&server_addr, sizeof(server_addr));
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if (rv == -1) {
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perror("sendto: ");
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exit(EXIT_FAILURE);
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}
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// printf("Sent %x to the server\n", buffer.number);
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sleep(10);
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}
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}
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void run_client(int port) {
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int sockfd = socket(AF_INET, SOCK_STREAM, 0);
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if (sockfd < 0) {
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fprintf(stderr, "socket: ");
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exit(EXIT_FAILURE);
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}
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struct sockaddr_in server_addr;
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memset(&server_addr, 0, sizeof(server_addr));
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server_addr.sin_family = AF_INET;
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server_addr.sin_addr.s_addr = INADDR_ANY;
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server_addr.sin_port = htons(port);
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if (connect(sockfd, (const struct sockaddr *)&server_addr, sizeof(server_addr))) {
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perror("connect");
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exit(EXIT_FAILURE);
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}
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pid_t pid;
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pid = fork();
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if (pid == -1) {
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perror("fork: ");
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exit(EXIT_FAILURE);
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}
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if (pid == 0) {
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send_integers(sockfd, &server_addr);
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}
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char response[] = "DATA RECEIVED";
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char buffer[100];
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int rv;
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while (1) {
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rv = recv(sockfd, buffer, sizeof(buffer), 0);
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if (rv < 0) {
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fprintf(stderr, "recvfrom: ");
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exit(EXIT_FAILURE);
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}
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if (strlen(buffer)) {
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printf("From server: %s\n", buffer);
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rv = send(sockfd, response, sizeof(response), 0);
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if (rv == -1) {
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perror("send");
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exit(EXIT_FAILURE);
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}
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}
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memset(&buffer, 0, sizeof(buffer));
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}
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}
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int main(int argc, char *argv[]) {
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handle_arguments(argc, argv);
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run_client(strtol(argv[1], NULL, 10));
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return 0;
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} |