tinyclient.c

// Cliente TCP minimal — hace GET / a un host:port y vuelca la respuesta.
// Uso: ./tinyclient <host> <port>
#include "../0x260/0x265_hacking.h"
#include <netdb.h>

int main(int argc, char *argv[]) {
    int sockfd, recv_length;
    struct sockaddr_in target_addr;
    struct hostent *target;
    char buffer[2048];
    char request[256];

    if (argc < 3) {
        printf("Uso: %s <host> <port>\n", argv[0]);
        return 1;
    }

    target = gethostbyname(argv[1]);
    if (!target) fatal("gethostbyname");

    if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) fatal("socket");

    target_addr.sin_family = AF_INET;
    target_addr.sin_port   = htons(atoi(argv[2]));
    memcpy(&target_addr.sin_addr, target->h_addr_list[0], target->h_length);
    memset(&target_addr.sin_zero, 0, 8);

    if (connect(sockfd, (struct sockaddr *) &target_addr, sizeof(struct sockaddr)) == -1)
        fatal("connect");

    snprintf(request, sizeof(request),
             "GET / HTTP/1.0\r\nHost: %s\r\nUser-Agent: tinyclient\r\n\r\n",
             argv[1]);
    send(sockfd, request, strlen(request), 0);

    while ((recv_length = recv(sockfd, buffer, sizeof(buffer) - 1, 0)) > 0) {
        buffer[recv_length] = '\0';
        printf("%s", buffer);
    }
    close(sockfd);
    return 0;
}