EinfuehrungInDocker/Teil2/main.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>

#define PORT 5000
#define BUFFER_SIZE 1024

int main(int argc, char *argv[]) {
    char *endpoint = "";
    char *data = ""; // Data to be sent in the POST request
    if (argc > 1) {
        endpoint = argv[1];
    }
    if (argc > 2) {
        data = argv[2];
    }

    char request[BUFFER_SIZE];
    snprintf(request, BUFFER_SIZE, "POST /%s HTTP/1.1\r\nHost: localhost:5000\r\nContent-Type: application/json\r\nContent-Length: %ld\r\n\r\n%s", endpoint, strlen(data), data);

    int sockfd;
    struct sockaddr_in server_addr;
    char buffer[BUFFER_SIZE];

    // Create socket
    sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd < 0) {
        perror("Error in socket creation");
        exit(EXIT_FAILURE);
    }

    // Set up server address
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
    server_addr.sin_port = htons(PORT);

    // Connect to server
    if (connect(sockfd, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
        perror("Error in connection");
        exit(EXIT_FAILURE);
    }

    // Send HTTP request
    if (send(sockfd, request, strlen(request), 0) != strlen(request)) {
        perror("Error in sending request");
        exit(EXIT_FAILURE);
    }

    // Receive data from server
    ssize_t total_bytes_received = 0;
    ssize_t bytes_received;
    while ((bytes_received = recv(sockfd, buffer, BUFFER_SIZE, 0)) > 0) {
        // Display received data
        fwrite(buffer, 1, bytes_received, stdout);
        total_bytes_received += bytes_received;
    }

    if (bytes_received < 0) {
        perror("Error in receiving data");
        exit(EXIT_FAILURE);
    }

    // Close socket
    close(sockfd);

    return 0;
}