socket.c 4.12 KB
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#include <netdb.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
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#include <stdlib.h>
#include "../defines.h"
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#include "socket.h"
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#include "packet.h"
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int prrt_create_socket(prrt_socket *sock_ptr, uint16_t port) {
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    // Create Data Socket
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    if((sock_ptr->fd_data = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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        perror("cannot create socket");
        return -1;
    }

    // Bind Data Socket
    struct sockaddr_in address;
    memset((char*) &address, 0, sizeof(address));
    address.sin_family = AF_INET;
    address.sin_addr.s_addr = htonl(INADDR_ANY);
    address.sin_port = htons(port);

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    if(bind(sock_ptr->fd_data, (struct sockaddr *) &address, sizeof(address)) < 0) {
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        perror("cannot bind socket");
        return -1;
    }

    // Create Feedback Socket
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    if((sock_ptr->fd_feedback = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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        perror("cannot create socket");
        return -1;
    }

    // Bind Feedback Socket
    memset((char*) &address, 0, sizeof(address));
    address.sin_family = AF_INET;
    address.sin_addr.s_addr = htonl(INADDR_ANY);
    address.sin_port = htons((uint16_t) (port + 1)); // TODO: fail if port is 65535

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    if(bind(sock_ptr->fd_feedback, (struct sockaddr *) &address, sizeof(address)) < 0) {
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        perror("cannot bind socket");
        return -1;
    }

    return 0;
}

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int prrt_connect(prrt_socket *sock_ptr, char *host, uint16_t port) {
    prrt_receiver recv =  { host , port};
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    if(sock_ptr->receiver_len < PRRT_MAX_RECEIVER_COUNT) {
        sock_ptr->receivers[sock_ptr->receiver_len] =recv;
        sock_ptr->receiver_len++;
    } else {
        return -1;
    }
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    return 0;
}

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int prrt_send(prrt_socket *sock_ptr, const void *data, size_t data_len) {
    int i;
    for(i = 0; i < sock_ptr->receiver_len; i++) {
        prrt_receiver recv = sock_ptr->receivers[i];
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        struct hostent *hp;
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        struct sockaddr_in targetaddr;
        memset((char*) &targetaddr, 0, sizeof(targetaddr));
        targetaddr.sin_family = AF_INET;
        targetaddr.sin_port = htons(recv.port);
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        hp = gethostbyname(recv.host_name);
        memcpy((void *)&targetaddr.sin_addr, hp->h_addr_list[0], (size_t) hp->h_length);
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        // TODO: create source packet

        prrt_packet * packet = malloc(sizeof(prrt_packet));
        create_packet_source(packet, 0, data, data_len);




        if((sendto(sock_ptr->fd_data, data, data_len, 0, (struct sockaddr *) &targetaddr, sizeof(targetaddr)) < 0)) {
            perror("sendto failed");
            return -1;
        }
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    }
    return 0;
}

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ssize_t prrt_recv(prrt_socket *sock_ptr, void *bufin, size_t length) {
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    // RECEIVE DATA
    ssize_t n;
    struct sockaddr_in remote;
    socklen_t addrlen = sizeof(remote);

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    n = recvfrom(sock_ptr->fd_data, bufin, length, 0, (struct sockaddr *) &remote, &addrlen);
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    uint16_t remote_port = ntohs(remote.sin_port);
    char *remote_host = inet_ntoa(remote.sin_addr);
    printf("got a datagram from %s port %d\n", remote_host, remote_port);


    // REPLY
    struct sockaddr_in targetaddr;
    memset((char*) &targetaddr, 0, sizeof(targetaddr));
    targetaddr.sin_family = AF_INET;
    targetaddr.sin_port = htons(remote_port + 1);

    struct hostent *hp;

    hp = gethostbyname(remote_host);
    memcpy((void *)&targetaddr.sin_addr, hp->h_addr_list[0], hp->h_length);

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    if((sendto(sock_ptr->fd_data, bufin, n, 0, (struct sockaddr *) &targetaddr, sizeof(targetaddr)) < 0)) {
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        perror("sendto failed");
        return -1;
    }
    
    return n;
}

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int prrt_close_socket(prrt_socket *sock_ptr) {
    // TODO: clean up all receivers

    close(sock_ptr->fd_data);
    close(sock_ptr->fd_feedback);
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    return 0;
}

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ssize_t prrt_recv_feedback(prrt_socket *sock_ptr, void *bufin, size_t length) {
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    printf("RECEIVING FB");
    ssize_t n;
    struct sockaddr_in remote;
    socklen_t addrlen = sizeof(remote);

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    n = recvfrom(sock_ptr->fd_feedback, bufin, length, 0, (struct sockaddr *) &remote, &addrlen);
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    uint16_t remote_port = ntohs(remote.sin_port);
    char *remote_host = inet_ntoa(remote.sin_addr);
    printf("got feedback from %s port %d\n", remote_host, remote_port);

    return n;
}