lokinet/llarp/router.cpp
Jeff Becker d426f9e65e
more
2018-05-23 09:49:00 -04:00

452 lines
9.4 KiB
C++

#include "router.hpp"
#include <llarp/dtls.h>
#include <llarp/ibfq.h>
#include <llarp/iwp.h>
#include <llarp/link.h>
#include <llarp/proto.h>
#include <llarp/router.h>
#include "buffer.hpp"
#include "net.hpp"
#include "str.hpp"
#include <fstream>
namespace llarp
{
void
router_iter_config(llarp_config_iterator *iter, const char *section,
const char *key, const char *val);
} // namespace llarp
llarp_router::llarp_router(struct llarp_alloc *m) : ready(false), mem(m)
{
llarp_rc_clear(&rc);
llarp_msg_muxer_init(&muxer);
}
llarp_router::~llarp_router()
{
llarp_rc_free(&rc);
}
void
llarp_router::try_connect(fs::path rcfile)
{
byte_t tmp[MAX_RC_SIZE];
llarp_rc remote = {0};
llarp_buffer_t buf;
llarp::StackBuffer< decltype(tmp) >(buf, tmp);
// open file
{
std::ifstream f(rcfile, std::ios::binary);
if(f.is_open())
{
f.seekg(0, std::ios::end);
size_t sz = f.tellg();
f.seekg(0, std::ios::beg);
if(sz <= buf.sz)
{
f.read((char *)buf.base, sz);
}
else
printf("file too large\n");
}
else
{
printf("failed to open %s\n", rcfile.c_str());
return;
}
}
if(llarp_rc_bdecode(mem, &remote, &buf))
{
if(llarp_rc_verify_sig(&crypto, &remote))
{
printf("signature valided\n");
if(llarp_router_try_connect(this, &remote))
{
printf("session attempt started\n");
}
else
{
printf("session already pending\n");
}
}
else
printf("failed to verify signature\n");
}
else
printf("failed to decode buffer, read=%ld\n", buf.cur - buf.base);
llarp_rc_free(&remote);
}
bool
llarp_router::EnsureIdentity()
{
return llarp_findOrCreateIdentity(&crypto, ident_keyfile.c_str(), identity);
}
void
llarp_router::AddLink(struct llarp_link *link)
{
links.push_back(link);
ready = true;
}
bool
llarp_router::Ready()
{
return ready;
}
bool
llarp_router::SaveRC()
{
printf("verify rc signature... ");
if(!llarp_rc_verify_sig(&crypto, &rc))
{
printf(" BAD!\n");
return false;
}
printf(" OK.\n");
byte_t tmp[MAX_RC_SIZE];
auto buf = llarp::StackBuffer< decltype(tmp) >(tmp);
if(llarp_rc_bencode(&rc, &buf))
{
std::ofstream f(our_rc_file);
if(f.is_open())
{
f.write((char *)buf.base, buf.cur - buf.base);
return true;
}
}
return false;
}
void
llarp_router::Close()
{
for(auto link : links)
{
link->stop_link(link);
}
}
void
llarp_router::on_try_connect_result(llarp_link_establish_job *job)
{
printf("on_try_connect_result\n");
if(job->session)
printf("session made\n");
else
printf("session not made\n");
delete job;
}
void
llarp_router::Run()
{
// zero out router contact
llarp::Zero(&rc, sizeof(llarp_rc));
// fill our address list
rc.addrs = llarp_ai_list_new(mem);
for(auto link : links)
{
llarp_ai addr;
link->get_our_address(link, &addr);
llarp_ai_list_pushback(rc.addrs, &addr);
};
// set public key
llarp_rc_set_pubkey(&rc, pubkey());
llarp_rc_sign(&crypto, identity, &rc);
if(!SaveRC())
{
printf("failed to save rc\n");
return;
}
printf("saved router contact\n");
// start links
for(auto link : links)
{
int result = link->start_link(link, logic);
if(result == -1)
printf("link %s failed to start\n", link->name());
else
printf("link %s started\n", link->name());
}
printf("connecting to routers\n");
for(const auto &itr : connect)
{
printf("try connecting to %s\n", itr.first.c_str());
try_connect(itr.second);
}
}
bool
llarp_router::iter_try_connect(llarp_router_link_iter *iter,
llarp_router *router, llarp_link *link)
{
if(!link)
return false;
llarp_link_establish_job *job = new llarp_link_establish_job;
if(!job)
return false;
llarp_ai *ai = static_cast< llarp_ai * >(iter->user);
llarp_ai_copy(&job->ai, ai);
job->timeout = 5000;
job->result = &llarp_router::on_try_connect_result;
// give router as user pointer
job->user = router;
printf("try_establish\n");
link->try_establish(link, job);
printf("return true\n");
return true;
}
extern "C" {
struct llarp_router *
llarp_init_router(struct llarp_alloc *mem, struct llarp_threadpool *tp,
struct llarp_ev_loop *netloop, struct llarp_logic *logic)
{
llarp_router *router = new llarp_router(mem);
if(router)
{
router->netloop = netloop;
router->tp = tp;
router->logic = logic;
llarp_crypto_libsodium_init(&router->crypto);
llarp_msg_muxer_init(&router->muxer);
}
return router;
}
bool
llarp_configure_router(struct llarp_router *router, struct llarp_config *conf)
{
llarp_config_iterator iter;
iter.user = router;
iter.visit = llarp::router_iter_config;
llarp_config_iter(conf, &iter);
if(!router->Ready())
{
printf("router not ready\n");
return false;
}
return router->EnsureIdentity();
}
void
llarp_run_router(struct llarp_router *router)
{
router->Run();
}
bool
llarp_router_try_connect(struct llarp_router *router, struct llarp_rc *remote)
{
// try first address only
llarp_ai addr;
if(llarp_ai_list_index(remote->addrs, 0, &addr))
{
printf("try connect to first address\n");
llarp_router_iterate_links(router,
{&addr, &llarp_router::iter_try_connect});
return true;
}
else
printf("router has no addresses?\n");
return false;
}
void
llarp_rc_clear(struct llarp_rc *rc)
{
// zero out router contact
llarp::Zero(rc, sizeof(llarp_rc));
}
bool
llarp_rc_addr_list_iter(struct llarp_ai_list_iter *iter, struct llarp_ai *ai)
{
struct llarp_rc *rc = (llarp_rc *)iter->user;
llarp_ai_list_pushback(rc->addrs, ai);
return true;
}
void
llarp_rc_set_addrs(struct llarp_rc *rc, struct llarp_alloc *mem,
struct llarp_ai_list *addr)
{
rc->addrs = llarp_ai_list_new(mem);
struct llarp_ai_list_iter ai_itr;
ai_itr.user = rc;
ai_itr.visit = &llarp_rc_addr_list_iter;
llarp_ai_list_iterate(addr, &ai_itr);
}
void
llarp_rc_set_pubkey(struct llarp_rc *rc, uint8_t *pubkey)
{
// set public key
memcpy(rc->pubkey, pubkey, 32);
}
bool
llarp_findOrCreateIdentity(llarp_crypto *crypto, const char *fpath,
byte_t *secretkey)
{
fs::path path(fpath);
std::error_code ec;
if(!fs::exists(path, ec))
{
crypto->keygen(secretkey);
std::ofstream f(path, std::ios::binary);
if(f.is_open())
{
f.write((char *)secretkey, sizeof(llarp_seckey_t));
}
}
std::ifstream f(path, std::ios::binary);
if(f.is_open())
{
f.read((char *)secretkey, sizeof(llarp_seckey_t));
return true;
}
return false;
}
bool
llarp_rc_write(struct llarp_rc *rc, const char *fpath)
{
fs::path our_rc_file(fpath);
byte_t tmp[MAX_RC_SIZE];
auto buf = llarp::StackBuffer< decltype(tmp) >(tmp);
if(llarp_rc_bencode(rc, &buf))
{
std::ofstream f(our_rc_file, std::ios::binary);
if(f.is_open())
{
f.write((char *)buf.base, buf.cur - buf.base);
return true;
}
}
return false;
}
void
llarp_rc_sign(llarp_crypto *crypto, const byte_t *seckey, struct llarp_rc *rc)
{
byte_t buf[MAX_RC_SIZE];
auto signbuf = llarp::StackBuffer< decltype(buf) >(buf);
// zero out previous signature
llarp::Zero(rc->signature, sizeof(rc->signature));
// encode
if(llarp_rc_bencode(rc, &signbuf))
{
// sign
signbuf.sz = signbuf.cur - signbuf.base;
printf("router.cpp::llarp_rc_sign - sized [%zu/%zu]\n", signbuf.sz,
MAX_RC_SIZE);
crypto->sign(rc->signature, seckey, signbuf);
printf("router.cpp::llarp_rc_sign - signed\n");
}
}
void
llarp_stop_router(struct llarp_router *router)
{
if(router)
router->Close();
}
void
llarp_router_iterate_links(struct llarp_router *router,
struct llarp_router_link_iter i)
{
for(auto link : router->links)
if(!i.visit(&i, router, link))
return;
}
void
llarp_free_router(struct llarp_router **router)
{
if(*router)
{
for(auto &link : (*router)->links)
{
link->free_impl(link);
delete link;
}
delete *router;
}
*router = nullptr;
}
}
namespace llarp
{
void
router_iter_config(llarp_config_iterator *iter, const char *section,
const char *key, const char *val)
{
llarp_router *self = static_cast< llarp_router * >(iter->user);
int af;
uint16_t proto;
if(StrEq(val, "eth"))
{
af = AF_PACKET;
proto = LLARP_ETH_PROTO;
}
else
{
af = AF_INET6;
proto = std::atoi(val);
}
struct llarp_link *link = nullptr;
if(StrEq(section, "iwp-links"))
{
link = new llarp_link;
llarp::Zero(link, sizeof(llarp_link));
llarp_iwp_args args = {
.mem = self->mem,
.crypto = &self->crypto,
.logic = self->logic,
.cryptoworker = self->tp,
.keyfile = self->transport_keyfile.c_str(),
};
iwp_link_init(link, args, &self->muxer);
if(llarp_link_initialized(link))
{
if(link->configure(link, self->netloop, key, af, proto))
{
llarp_ai ai;
link->get_our_address(link, &ai);
llarp::Addr addr = ai;
printf("link %s bound to %s\n", key, addr.to_string().c_str());
self->AddLink(link);
return;
}
}
printf("link %s failed to configure\n", key);
}
else if(StrEq(section, "iwp-connect"))
{
self->connect[key] = val;
}
}
} // namespace llarp