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/*
* Copyright (c) 2018-2021, OARC, Inc.
* All rights reserved.
*
* This file is part of dnsjit.
*
* dnsjit is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* dnsjit is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with dnsjit. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "input/pcap.h"
#include "core/assert.h"
#include "core/object/pcap.h"
static core_log_t _log = LOG_T_INIT("input.pcap");
static input_pcap_t _defaults = {
LOG_T_INIT_OBJ("input.pcap"),
0, 0,
0,
CORE_OBJECT_PCAP_INIT(0),
0, 0,
0, 0
};
core_log_t* input_pcap_log()
{
return &_log;
}
void input_pcap_init(input_pcap_t* self)
{
mlassert_self();
*self = _defaults;
}
void input_pcap_destroy(input_pcap_t* self)
{
mlassert_self();
if (self->pcap) {
pcap_close(self->pcap);
}
}
int input_pcap_create(input_pcap_t* self, const char* source)
{
char errbuf[PCAP_ERRBUF_SIZE] = { 0 };
mlassert_self();
lassert(source, "source is nil");
if (self->pcap) {
lfatal("already opened");
}
if (!(self->pcap = pcap_create(source, errbuf))) {
lcritical("pcap_create(%s) error: %s", source, errbuf);
return -1;
}
return 0;
}
int input_pcap_activate(input_pcap_t* self)
{
int ret;
mlassert_self();
if (!self->pcap) {
lfatal("no PCAP opened");
}
if (!(ret = pcap_activate(self->pcap))) {
self->snaplen = pcap_snapshot(self->pcap);
self->linktype = pcap_datalink(self->pcap);
self->is_swapped = 0;
self->prod_pkt.snaplen = self->snaplen;
self->prod_pkt.linktype = self->linktype;
self->prod_pkt.is_swapped = self->is_swapped;
ldebug("pcap v%u.%u snaplen:%lu %s", pcap_major_version(self->pcap), pcap_minor_version(self->pcap), self->snaplen, self->is_swapped ? " swapped" : "");
}
return ret;
}
int input_pcap_open_offline(input_pcap_t* self, const char* file)
{
char errbuf[PCAP_ERRBUF_SIZE] = { 0 };
mlassert_self();
lassert(file, "file is nil");
if (self->pcap) {
lfatal("already opened");
}
if (!(self->pcap = pcap_open_offline(file, errbuf))) {
lcritical("pcap_open_offline(%s) error: %s", file, errbuf);
return -1;
}
self->snaplen = pcap_snapshot(self->pcap);
self->linktype = pcap_datalink(self->pcap);
self->is_swapped = pcap_is_swapped(self->pcap);
self->prod_pkt.snaplen = self->snaplen;
self->prod_pkt.linktype = self->linktype;
self->prod_pkt.is_swapped = self->is_swapped;
ldebug("pcap v%u.%u snaplen:%lu %s", pcap_major_version(self->pcap), pcap_minor_version(self->pcap), self->snaplen, self->is_swapped ? " swapped" : "");
return 0;
}
static void _handler(u_char* user, const struct pcap_pkthdr* h, const u_char* bytes)
{
input_pcap_t* self = (input_pcap_t*)user;
core_object_pcap_t pkt = CORE_OBJECT_PCAP_INIT(0);
mlassert_self();
lassert(h, "pcap_pkthdr is nil");
lassert(bytes, "bytes is nil");
self->pkts++;
pkt.snaplen = self->snaplen;
pkt.linktype = self->linktype;
pkt.ts.sec = h->ts.tv_sec;
pkt.ts.nsec = h->ts.tv_usec * 1000;
pkt.caplen = h->caplen;
pkt.len = h->len;
pkt.bytes = bytes;
pkt.is_swapped = self->is_swapped;
self->recv(self->ctx, (core_object_t*)&pkt);
}
int input_pcap_loop(input_pcap_t* self, int cnt)
{
mlassert_self();
if (!self->pcap) {
lfatal("no PCAP opened");
}
if (!self->recv) {
lfatal("no receiver set");
}
return pcap_loop(self->pcap, cnt, _handler, (void*)self);
}
int input_pcap_dispatch(input_pcap_t* self, int cnt)
{
mlassert_self();
if (!self->pcap) {
lfatal("no PCAP opened");
}
if (!self->recv) {
lfatal("no receiver set");
}
return pcap_dispatch(self->pcap, cnt, _handler, (void*)self);
}
static const core_object_t* _produce(input_pcap_t* self)
{
struct pcap_pkthdr* h;
const u_char* bytes;
int ret = 0;
mlassert_self();
while (!(ret = pcap_next_ex(self->pcap, &h, &bytes)))
;
if (ret == 1 && h && bytes) {
self->prod_pkt.ts.sec = h->ts.tv_sec;
self->prod_pkt.ts.nsec = h->ts.tv_usec * 1000;
self->prod_pkt.caplen = h->caplen;
self->prod_pkt.len = h->len;
self->prod_pkt.bytes = bytes;
return (core_object_t*)&self->prod_pkt;
}
return 0;
}
core_producer_t input_pcap_producer(input_pcap_t* self)
{
mlassert_self();
if (!self->pcap) {
lfatal("no PCAP opened");
}
return (core_producer_t)_produce;
}
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