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/*
* (C) 2014 by Pablo Neira Ayuso <pablo@netfilter.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*/
#include <stdio.h>
#include <stdlib.h>
#include <fd.h>
#include <tcp.h>
#include <unistd.h>
#include <config.h>
#include <string.h>
#include <errno.h>
#include "init.h"
#include "logging.h"
#include "msg_buff.h"
#include "proto.h"
#include "config.h"
#include "proto.h"
#include "mnl.h"
#include "utils.h"
static int send_ruleset(struct nft_fd *nfd)
{
struct msg_buff *msgb;
struct nft_sync_hdr *hdr;
int ret, ruleset_len;
const char *ruleset = netlink_dump_ruleset(nfts_inst.nl_query_sock);
if (ruleset == NULL)
return 0;
ruleset_len = strlen(ruleset);
msgb = msgb_alloc(sizeof(struct nft_sync_hdr) + ruleset_len);
if (msgb == NULL) {
xfree(ruleset);
return -1;
}
hdr = msgb_put(msgb, sizeof(struct nft_sync_hdr) + ruleset_len);
hdr->len = htonl(sizeof(struct nft_sync_hdr) + ruleset_len);
memcpy(hdr->data, ruleset, ruleset_len);
xfree(ruleset);
ret = send(nfd->fd, msgb_data(msgb), msgb_len(msgb), 0);
msgb_free(msgb);
return ret;
}
static int nfts_parse_request(struct nft_fd *nfd, const char *req)
{
int ret = -1;
if (strncmp(req, "fetch", strlen("fetch")) == 0)
ret = send_ruleset(nfd);
return ret;
}
static void tcp_server_established_cb(struct nft_fd *nfd, uint32_t mask)
{
struct msg_buff *msgb = nfd->data;
struct nft_sync_hdr *hdr;
uint32_t len;
int ret;
ret = recv(nfd->fd, msgb_tail(msgb),
msgb_size(msgb) - msgb_len(msgb), 0);
if (ret == 0)
goto err1;
else if (ret < 0) {
nfts_log(NFTS_LOG_ERROR, "cannot receive from client");
goto err1;
}
msgb_put(msgb, ret);
/* Not enough room for header yet, grab more bytes later */
if (msgb_len(msgb) < sizeof(struct nft_sync_hdr))
return;
hdr = (struct nft_sync_hdr *) msgb_data(msgb);
len = ntohl(hdr->len);
if (len >= NFTS_MAX_REQUEST) {
nfts_log(NFTS_LOG_ERROR, "discarding message too large %d",
len, NFTS_MAX_REQUEST);
goto err1;
}
/* Not enough data to process this request yet */
if (len < (uint32_t)ret)
return;
hdr = msgb_pull(msgb, len);
if (hdr == NULL) {
nfts_log(NFTS_LOG_FATAL, "cannot pull out header");
goto err1;
}
if (nfts_parse_request(nfd, hdr->data) < 0) {
nfts_log(NFTS_LOG_ERROR, "discarding malformed request");
goto err1;
}
/* There's still some pending bytes from the stream in the message,
* move them at the head of the message buffer.
*/
if (msgb_len(msgb) > 0)
msgb_burp(msgb);
return;
err1:
nfts_log(NFTS_LOG_NOTICE, "closing connection");
msgb_free(msgb);
close(nfd->fd);
nft_fd_unregister(nfd);
nft_fd_free(nfd);
}
static void tcp_server_cb(struct nft_fd *nfd, uint32_t mask)
{
struct nft_fd *accept_nfd;
struct msg_buff *msgb;
struct sockaddr_in addr;
int fd;
msgb = msgb_alloc(NFTS_MAX_REQUEST);
if (msgb == NULL) {
nfts_log(NFTS_LOG_ERROR, "OOM");
return;
}
fd = tcp_server_accept(nfd->data, &addr);
if (fd < 0) {
msgb_free(msgb);
nfts_log(NFTS_LOG_ERROR, "failed to accept socket");
return;
}
nfts_log(NFTS_LOG_NOTICE, "accepted new connection from %s",
inet_ntoa(addr.sin_addr));
accept_nfd = nft_fd_alloc();
nft_fd_setup(accept_nfd, fd, tcp_server_established_cb, msgb);
nft_fd_register(accept_nfd, EV_READ | EV_PERSIST);
}
int tcp_server_start(struct nft_sync_inst *inst)
{
struct tcp_server *s;
nfts_inst.tcp.ipproto = AF_INET;
nfts_inst.tcp.port = 1234;
s = tcp_server_create(&inst->tcp);
if (s == NULL)
return -1;
nft_fd_setup(&inst->tcp_server_fd, tcp_server_get_fd(s),
tcp_server_cb, s);
nft_fd_register(&inst->tcp_server_fd, EV_READ | EV_PERSIST);
return 0;
}
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