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// license:BSD-3-Clause
// copyright-holders:Carl
#include "netdev_module.h"
#include "modules/osdmodule.h"
#if defined(OSD_NET_USE_PCAP)
#include "modules/lib/osdlib.h"
#include "osdnet.h"
#include "osdcore.h" // osd_printf_*
#include "util/strformat.h" // string_format
#if defined(SDLMAME_WIN32) || defined(OSD_WINDOWS)
#include <windows.h>
#undef interface
#define LIB_NAME "wpcap.dll"
#elif defined(SDLMAME_MACOSX)
#include <pthread.h>
#include <libkern/OSAtomic.h>
#define LIB_NAME "libpcap.dylib"
#else
#define LIB_NAME "libpcap.so"
#endif
#include <pcap.h>
namespace osd {
namespace {
// Typedefs for dynamically loaded functions
typedef int (*pcap_findalldevs_fn)(pcap_if_t **, char *);
typedef pcap_t *(*pcap_open_live_fn)(const char *, int, int, int, char *);
typedef int (*pcap_next_ex_fn)(pcap_t *, struct pcap_pkthdr **, const u_char **);
typedef int (*pcap_compile_fn)(pcap_t *, struct bpf_program *, const char *, int, bpf_u_int32);
typedef void (*pcap_close_fn)(pcap_t *);
typedef int (*pcap_setfilter_fn)(pcap_t *, struct bpf_program *);
typedef int (*pcap_sendpacket_fn)(pcap_t *, const u_char *, int);
typedef int (*pcap_set_datalink_fn)(pcap_t *, int);
typedef int (*pcap_dispatch_fn)(pcap_t *, int, pcap_handler, u_char *);
class pcap_module : public osd_module, public netdev_module
{
public:
pcap_module()
: osd_module(OSD_NETDEV_PROVIDER, "pcap"), netdev_module(),
pcap_findalldevs_dl(nullptr), pcap_open_live_dl(nullptr), pcap_next_ex_dl(nullptr), pcap_compile_dl(nullptr),
pcap_close_dl(nullptr), pcap_setfilter_dl(nullptr), pcap_sendpacket_dl(nullptr), pcap_set_datalink_dl(nullptr), pcap_dispatch_dl(nullptr)
{
}
virtual ~pcap_module() { }
virtual int init(osd_interface &osd, const osd_options &options) override;
virtual void exit() override;
virtual bool probe() override
{
pcap_dll = osd::dynamic_module::open({ LIB_NAME });
pcap_findalldevs_dl = pcap_dll->bind<pcap_findalldevs_fn>("pcap_findalldevs");
pcap_open_live_dl = pcap_dll->bind<pcap_open_live_fn>("pcap_open_live");
pcap_next_ex_dl = pcap_dll->bind<pcap_next_ex_fn>("pcap_next_ex");
pcap_compile_dl = pcap_dll->bind<pcap_compile_fn>("pcap_compile");
pcap_close_dl = pcap_dll->bind<pcap_close_fn>("pcap_close");
pcap_setfilter_dl = pcap_dll->bind<pcap_setfilter_fn>("pcap_setfilter");
pcap_sendpacket_dl = pcap_dll->bind<pcap_sendpacket_fn>("pcap_sendpacket");
pcap_set_datalink_dl = pcap_dll->bind<pcap_set_datalink_fn>("pcap_set_datalink");
pcap_dispatch_dl = pcap_dll->bind<pcap_dispatch_fn>("pcap_dispatch");
if (!pcap_findalldevs_dl || !pcap_open_live_dl || !pcap_next_ex_dl ||
!pcap_compile_dl || !pcap_close_dl || !pcap_setfilter_dl ||
!pcap_sendpacket_dl || !pcap_set_datalink_dl || !pcap_dispatch_dl)
{
osd_printf_verbose("Unable to load the PCAP library\n");
return false;
}
return true;
}
osd::dynamic_module::ptr pcap_dll;
pcap_findalldevs_fn pcap_findalldevs_dl;
pcap_open_live_fn pcap_open_live_dl;
pcap_next_ex_fn pcap_next_ex_dl;
pcap_compile_fn pcap_compile_dl;
pcap_close_fn pcap_close_dl;
pcap_setfilter_fn pcap_setfilter_dl;
pcap_sendpacket_fn pcap_sendpacket_dl;
pcap_set_datalink_fn pcap_set_datalink_dl;
pcap_dispatch_fn pcap_dispatch_dl;
};
// FIXME: bridge between pcap_module and netdev_pcap
static pcap_module *module = nullptr;
#ifdef SDLMAME_MACOSX
struct netdev_pcap_context
{
uint8_t *pkt;
int len;
pcap_t *p;
uint8_t packets[32][1600];
int packetlens[32];
int head;
int tail;
};
#endif
class netdev_pcap : public osd_network_device
{
public:
netdev_pcap(const char *name, network_handler &ifdev);
~netdev_pcap();
virtual int send(uint8_t *buf, int len) override;
virtual void set_mac(const uint8_t *mac) override;
protected:
virtual int recv_dev(uint8_t **buf) override;
private:
pcap_t *m_p;
#ifdef SDLMAME_MACOSX
struct netdev_pcap_context m_ctx;
pthread_t m_thread;
#endif
};
#ifdef SDLMAME_MACOSX
static void netdev_pcap_handler(u_char *user, const struct pcap_pkthdr *h, const u_char *bytes)
{
struct netdev_pcap_context *ctx = (struct netdev_pcap_context*)user;
if(!ctx->p) return;
if(OSAtomicCompareAndSwapInt((ctx->head+1) & 0x1F, ctx->tail, &ctx->tail)) {
printf("buffer full, dropping packet\n");
return;
}
memcpy(ctx->packets[ctx->head], bytes, h->len);
ctx->packetlens[ctx->head] = h->len;
OSAtomicCompareAndSwapInt(ctx->head, (ctx->head+1) & 0x1F, &ctx->head);
}
static void *netdev_pcap_blocker(void *arg) {
struct netdev_pcap_context *ctx = (struct netdev_pcap_context*)arg;
while(ctx && ctx->p) {
(*module->pcap_dispatch_dl)(ctx->p, 1, netdev_pcap_handler, (u_char*)ctx);
}
return 0;
}
#endif
netdev_pcap::netdev_pcap(const char *name, network_handler &ifdev)
: osd_network_device(ifdev)
{
char errbuf[PCAP_ERRBUF_SIZE];
#if defined(SDLMAME_WIN32) || defined(OSD_WINDOWS)
m_p = (*module->pcap_open_live_dl)(name, 65535, 1, -1, errbuf);
#else
m_p = (*module->pcap_open_live_dl)(name, 65535, 1, 1, errbuf);
#endif
if(!m_p)
{
osd_printf_error("Unable to open %s: %s\n", name, errbuf);
return;
}
if ((*module->pcap_set_datalink_dl)(m_p, DLT_EN10MB) == -1)
{
osd_printf_error("Unable to set %s to ethernet", name);
(*module->pcap_close_dl)(m_p);
m_p = nullptr;
return;
}
netdev_pcap::set_mac(&get_mac()[0]);
#ifdef SDLMAME_MACOSX
m_ctx.head = 0;
m_ctx.tail = 0;
m_ctx.p = m_p;
pthread_create(&m_thread, nullptr, netdev_pcap_blocker, &m_ctx);
#endif
}
void netdev_pcap::set_mac(const uint8_t *mac)
{
struct bpf_program fp;
if(!m_p) return;
#ifdef SDLMAME_MACOSX
auto filter = util::string_format("not ether src %02X:%02X:%02X:%02X:%02X:%02X and (ether dst %02X:%02X:%02X:%02X:%02X:%02X or ether multicast or ether broadcast or ether dst 09:00:07:ff:ff:ff)", (unsigned char)mac[0], (unsigned char)mac[1], (unsigned char)mac[2],(unsigned char)mac[3], (unsigned char)mac[4], (unsigned char)mac[5], (unsigned char)mac[0], (unsigned char)mac[1], (unsigned char)mac[2],(unsigned char)mac[3], (unsigned char)mac[4], (unsigned char)mac[5]);
#else
auto filter = util::string_format("ether dst %02X:%02X:%02X:%02X:%02X:%02X or ether multicast or ether broadcast", (unsigned char)mac[0], (unsigned char)mac[1], (unsigned char)mac[2],(unsigned char)mac[3], (unsigned char)mac[4], (unsigned char)mac[5]);
#endif
if ((*module->pcap_compile_dl)(m_p, &fp, filter.c_str(), 1, 0) == -1) {
osd_printf_error("Error with pcap_compile\n");
}
if ((*module->pcap_setfilter_dl)(m_p, &fp) == -1) {
osd_printf_error("Error with pcap_setfilter\n");
}
}
int netdev_pcap::send(uint8_t *buf, int len)
{
int ret;
if(!m_p) {
printf("send invoked, but no pcap context\n");
return 0;
}
ret = (*module->pcap_sendpacket_dl)(m_p, buf, len);
printf("sent packet length %d, returned %d\n", len, ret);
return ret ? len : 0;
//return (!pcap_sendpacket_dl(m_p, buf, len))?len:0;
}
int netdev_pcap::recv_dev(uint8_t **buf)
{
#ifdef SDLMAME_MACOSX
uint8_t pktbuf[2048];
int ret;
// no device open?
if(!m_p) return 0;
// Empty
if(OSAtomicCompareAndSwapInt(m_ctx.head, m_ctx.tail, &m_ctx.tail)) {
return 0;
}
memcpy(pktbuf, m_ctx.packets[m_ctx.tail], m_ctx.packetlens[m_ctx.tail]);
ret = m_ctx.packetlens[m_ctx.tail];
OSAtomicCompareAndSwapInt(m_ctx.tail, (m_ctx.tail+1) & 0x1F, &m_ctx.tail);
*buf = pktbuf;
return ret;
#else
struct pcap_pkthdr *header;
if(!m_p) return 0;
return ((*module->pcap_next_ex_dl)(m_p, &header, (const u_char **)buf) == 1)?header->len:0;
#endif
}
netdev_pcap::~netdev_pcap()
{
#ifdef SDLMAME_MACOSX
m_ctx.p = nullptr;
pthread_cancel(m_thread);
pthread_join(m_thread, nullptr);
#endif
if(m_p) (*module->pcap_close_dl)(m_p);
m_p = nullptr;
}
static CREATE_NETDEV(create_pcap)
{
auto *dev = new netdev_pcap(ifname, ifdev);
return dynamic_cast<osd_network_device *>(dev);
}
int pcap_module::init(osd_interface &osd, const osd_options &options)
{
pcap_if_t *devs;
char errbuf[PCAP_ERRBUF_SIZE];
// FIXME: bridge between pcap_module and netdev_pcap
module = this;
if ((*pcap_findalldevs_dl)(&devs, errbuf) == -1)
{
osd_printf_error("Unable to get network devices: %s\n", errbuf);
return 1;
}
while(devs)
{
if(devs->description) {
add_netdev(devs->name, devs->description, create_pcap);
} else {
add_netdev(devs->name, devs->name, create_pcap);
}
devs = devs->next;
}
return 0;
}
void pcap_module::exit()
{
clear_netdev();
}
} // anonymous namespace
} // namespace osd
#else
namespace osd { namespace { MODULE_NOT_SUPPORTED(pcap_module, OSD_NETDEV_PROVIDER, "pcap") } }
#endif
MODULE_DEFINITION(NETDEV_PCAP, osd::pcap_module)
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