/* Copyright (c) 2008 Victor Julien <victor@inliniac.net> */

/* Author: William Metcalf
 *
 */

/* RespondReject is a threaded wrapper for sending Rejects
 *
 * TODO
 * - RespondRejectFunc returns 1 on error, 0 on ok... why? For now it should
 *   just return 0 always, error handling is a TODO in the threading model (VJ)
 */

#include <pthread.h>
#include <sys/signal.h>
#include <libnet.h>

#include "vips.h"
#include "decode.h"
#include "packet-queue.h"
#include "threads.h"
#include "threadvars.h"
#include "tm-queuehandlers.h"
#include "tm-modules.h"
#include "action-globals.h"

#include "respond-reject.h"
#include "respond-reject-libnet11.h"

int RejectSendIPv4TCP(ThreadVars *, Packet *, void *);
int RejectSendIPv4ICMP(ThreadVars *, Packet *, void *);
int RejectSendIPv6TCP(ThreadVars *, Packet *, void *);
int RejectSendIPv6ICMP(ThreadVars *, Packet *, void *);

void TmModuleRespondRejectRegister (void) {

    tmm_modules[TMM_RESPONDREJECT].name = "RespondReject";
    tmm_modules[TMM_RESPONDREJECT].Init = NULL;
    tmm_modules[TMM_RESPONDREJECT].Func = RespondRejectFunc;
    tmm_modules[TMM_RESPONDREJECT].Deinit = NULL;
    tmm_modules[TMM_RESPONDREJECT].RegisterTests = NULL;
}

int RespondRejectFunc(ThreadVars *tv, Packet *p, void *data, PacketQueue *pq) {

    /* ACTION_REJECT defaults to rejecting the SRC */
    if (p->action != ACTION_REJECT && p->action != ACTION_REJECT_DST &&
        p->action != ACTION_REJECT_BOTH) {
        return 0;
    }

    if (PKT_IS_IPV4(p)) {
        if (PKT_IS_TCP(p)) {
            return RejectSendIPv4TCP(tv, p, data);
        } else if(PKT_IS_UDP(p)) {
            return RejectSendIPv4ICMP(tv, p, data);
        } else {
            return 0;
        }
    } else if (PKT_IS_IPV6(p)) {
        if (PKT_IS_TCP(p)) {
            return RejectSendIPv6TCP(tv, p, data);
        } else if(PKT_IS_UDP(p)){
            return RejectSendIPv6ICMP(tv, p, data);
        } else {
            return 0;
        }
    } else {
        /* we're only supporting IPv4 and IPv6 */
        return 0;
    }
}

int RejectSendIPv4TCP(ThreadVars *tv, Packet *p, void *data) {
    if (p->action == ACTION_REJECT) {
        return RejectSendLibnet11L3IPv4TCP(tv, p, data, REJECT_DIR_SRC);
    } else if (p->action == ACTION_REJECT_DST) {
        return RejectSendLibnet11L3IPv4TCP(tv, p, data, REJECT_DIR_DST);
    } else if(p->action == ACTION_REJECT_BOTH) {
        if (RejectSendLibnet11L3IPv4TCP(tv, p, data, REJECT_DIR_SRC) == 0 &&
            RejectSendLibnet11L3IPv4TCP(tv, p, data, REJECT_DIR_DST) == 0) {
            return 0;
        } else {
            return 1;
        }
    }
    return 0;
}

int RejectSendIPv4ICMP(ThreadVars *tv, Packet *p, void *data) {
    if (p->action == ACTION_REJECT) {
        return RejectSendLibnet11L3IPv4ICMP(tv, p, data, REJECT_DIR_SRC);
    } else if (p->action == ACTION_REJECT_DST) {
        return RejectSendLibnet11L3IPv4ICMP(tv, p, data, REJECT_DIR_DST);
    } else if(p->action == ACTION_REJECT_BOTH) {
        if (RejectSendLibnet11L3IPv4ICMP(tv, p, data, REJECT_DIR_SRC) == 0 &&
            RejectSendLibnet11L3IPv4ICMP(tv, p, data, REJECT_DIR_DST) == 0) {
            return 0;
        } else {
            return 1;
        }
    }
    return 0;
}

int RejectSendIPv6TCP(ThreadVars *tv, Packet *p, void *data) {
    printf ("we would send a ipv6 tcp reset here\n");
    return 1;
}

int RejectSendIPv6ICMP(ThreadVars *tv, Packet *p, void *data) {
    printf ("we would send a ipv6 icmp reset here\n");
    return 1;
}