3 * class representing a virtual connection to a peer. In addition,
4 * it contains generic functions for socket management (see sock_open
7 * Created by Victor Grishchenko on 3/6/09.
8 * Copyright 2009-2012 TECHNISCHE UNIVERSITEIT DELFT. All rights reserved.
14 //#include <glog/logging.h>
18 using namespace swift;
24 swift::tint now_t::now = Channel::Time();
25 tint Channel::start = now_t::now;
26 tint Channel::epoch = now_t::now/360000000LL*360000000LL; // make logs mergeable
27 uint64_t Channel::global_dgrams_up=0, Channel::global_dgrams_down=0,
28 Channel::global_raw_bytes_up=0, Channel::global_raw_bytes_down=0,
29 Channel::global_bytes_up=0, Channel::global_bytes_down=0;
30 sckrwecb_t Channel::sock_open[] = {};
31 int Channel::sock_count = 0;
32 swift::tint Channel::last_tick = 0;
33 int Channel::MAX_REORDERING = 4;
34 bool Channel::SELF_CONN_OK = false;
35 swift::tint Channel::TIMEOUT = TINT_SEC*60;
36 std::vector<Channel*> Channel::channels(1);
37 Address Channel::tracker;
38 //tbheap Channel::send_queue;
39 FILE* Channel::debug_file = NULL;
40 #include "ext/simple_selector.cpp"
41 PeerSelector* Channel::peer_selector = new SimpleSelector();
42 tint Channel::MIN_PEX_REQUEST_INTERVAL = TINT_SEC;
49 Channel::Channel (FileTransfer* transfer, int socket, Address peer_addr) :
50 // Arno, 2011-10-03: Reordered to avoid g++ Wall warning
51 peer_(peer_addr), socket_(socket==INVALID_SOCKET?default_socket():socket), // FIXME
52 transfer_(transfer), peer_channel_id_(0), own_id_mentioned_(false),
53 data_in_(TINT_NEVER,bin_t::NONE), data_in_dbl_(bin_t::NONE),
54 data_out_cap_(bin_t::ALL),hint_out_size_(0),
55 // Gertjan fix 996e21e8abfc7d88db3f3f8158f2a2c4fc8a8d3f
56 // "Changed PEX rate limiting to per channel limiting"
57 last_pex_request_time_(0), next_pex_request_time_(0),
58 pex_request_outstanding_(false), useless_pex_count_(0),
59 pex_requested_(false), // Ric: init var that wasn't initialiazed
61 rtt_avg_(TINT_SEC), dev_avg_(0), dip_avg_(TINT_SEC),
62 last_send_time_(0), last_recv_time_(0), last_data_out_time_(0), last_data_in_time_(0),
63 last_loss_time_(0), next_send_time_(0), cwnd_(1), cwnd_count1_(0), send_interval_(TINT_SEC),
64 send_control_(PING_PONG_CONTROL), sent_since_recv_(0),
65 lastrecvwaskeepalive_(false), lastsendwaskeepalive_(false), // Arno: nap bug fix
67 ack_not_rcvd_recent_(0), owd_min_bin_(0), owd_min_bin_start_(NOW),
68 owd_cur_bin_(0), dgrams_sent_(0), dgrams_rcvd_(0),
69 raw_bytes_up_(0), raw_bytes_down_(0), bytes_up_(0), bytes_down_(0),
70 scheduled4close_(false)
74 this->id_ = channels.size();
75 channels.push_back(this);
76 transfer_->hs_in_.push_back(bin_t(id_));
77 for(int i=0; i<4; i++) {
78 owd_min_bins_[i] = TINT_NEVER;
79 owd_current_[i] = TINT_NEVER;
81 evsend_ptr_ = new struct event;
82 evtimer_assign(evsend_ptr_,evbase,&Channel::LibeventSendCallback,this);
83 evtimer_add(evsend_ptr_,tint2tv(next_send_time_));
86 transfer->mychannels_.insert(this);
88 dprintf("%s #%u init channel %s\n",tintstr(),id_,peer_.str());
89 //fprintf(stderr,"new Channel %d %s\n", id_, peer_.str() );
93 Channel::~Channel () {
94 dprintf("%s #%u dealloc channel\n",tintstr(),id_);
99 if (transfer_ != NULL)
100 transfer_->mychannels_.erase(this);
104 void Channel::ClearEvents()
106 if (evsend_ptr_ != NULL) {
107 if (evtimer_pending(evsend_ptr_,NULL))
108 evtimer_del(evsend_ptr_);
117 bool Channel::IsComplete() {
118 // Check if peak hash bins are filled.
119 if (file().peak_count() == 0)
122 for(int i=0; i<file().peak_count(); i++) {
123 bin_t peak = file().peak(i);
124 if (!ack_in_.is_filled(peak))
132 uint16_t Channel::GetMyPort() {
133 struct sockaddr_in mysin = {};
134 socklen_t mysinlen = sizeof(mysin);
135 if (getsockname(socket_, (struct sockaddr *)&mysin, &mysinlen) < 0)
137 print_error("error on getsockname");
141 return ntohs(mysin.sin_port);
144 bool Channel::IsDiffSenderOrDuplicate(Address addr, uint32_t chid)
148 // Got message from different address than I send to
150 if (!own_id_mentioned_ && addr.is_private()) {
151 // Arno, 2012-02-27: Got HANDSHAKE reply from IANA private address,
152 // check for duplicate connections:
154 // When two peers A and B are behind the same firewall, they will get
155 // extB, resp. extA addresses from the tracker. They will both
156 // connect to their counterpart but because the incoming packet
157 // will be from the intNAT address the duplicates are not
160 // Solution: when the second datagram comes in (HANDSHAKE reply),
161 // see if you have had a first datagram from the same addr
162 // (HANDSHAKE). If so, close the channel if his port number is
163 // larger than yours (such that one channel remains).
167 Channel *c = transfer().FindChannel(addr,this);
169 // I already initiated a connection to this peer,
170 // this new incoming message would establish a duplicate.
171 // One must break the connection, decide using port
173 dprintf("%s #%u found duplicate channel to %s\n",
174 tintstr(),chid,addr.str());
176 if (addr.port() > GetMyPort()) {
178 dprintf("%s #%u closing duplicate channel to %s\n",
179 tintstr(),chid,addr.str());
186 // Received HANDSHAKE reply from other address than I sent
187 // HANDSHAKE to, and the address is not an IANA private
188 // address (=no NAT in play), so close.
190 dprintf("%s #%u invalid peer address %s!=%s\n",
191 tintstr(),chid,peer().str(),addr.str());
207 tint Channel::Time () {
208 //HiResTimeOfDay* tod = HiResTimeOfDay::Instance();
209 //tint ret = tod->getTimeUSec();
210 //DLOG(INFO)<<"now is "<<ret;
211 return now_t::now = usec_time();
215 evutil_socket_t Channel::Bind (Address address, sckrwecb_t callbacks) {
216 struct sockaddr_in addr = address;
218 int len = sizeof(struct sockaddr_in), sndbuf=1<<20, rcvbuf=1<<20;
219 #define dbnd_ensure(x) { if (!(x)) { \
220 print_error("binding fails"); close_socket(fd); return INVALID_SOCKET; } }
221 dbnd_ensure ( (fd = socket(AF_INET, SOCK_DGRAM, 0)) >= 0 );
222 dbnd_ensure( make_socket_nonblocking(fd) ); // FIXME may remove this
224 dbnd_ensure ( setsockopt(fd, SOL_SOCKET, SO_SNDBUF,
225 (setsockoptptr_t)&sndbuf, sizeof(int)) == 0 );
226 dbnd_ensure ( setsockopt(fd, SOL_SOCKET, SO_RCVBUF,
227 (setsockoptptr_t)&rcvbuf, sizeof(int)) == 0 );
228 //setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (setsockoptptr_t)&enable, sizeof(int));
229 dbnd_ensure ( ::bind(fd, (sockaddr*)&addr, len) == 0 );
232 sock_open[sock_count++] = callbacks;
236 Address Channel::BoundAddress(evutil_socket_t sock) {
238 struct sockaddr_in myaddr;
239 socklen_t mylen = sizeof(myaddr);
240 int ret = getsockname(sock,(sockaddr*)&myaddr,&mylen);
242 return Address(myaddr);
250 Address swift::BoundAddress(evutil_socket_t sock) {
251 return Channel::BoundAddress(sock);
255 int Channel::SendTo (evutil_socket_t sock, const Address& addr, struct evbuffer *evb) {
257 int length = evbuffer_get_length(evb);
258 int r = sendto(sock,(const char *)evbuffer_pullup(evb, length),length,0,
259 (struct sockaddr*)&(addr.addr),sizeof(struct sockaddr_in));
261 print_error("can't send");
262 evbuffer_drain(evb, length); // Arno: behaviour is to pretend the packet got lost
265 evbuffer_drain(evb,r);
267 global_raw_bytes_up+=length;
272 int Channel::RecvFrom (evutil_socket_t sock, Address& addr, struct evbuffer *evb) {
273 socklen_t addrlen = sizeof(struct sockaddr_in);
274 struct evbuffer_iovec vec;
275 if (evbuffer_reserve_space(evb, SWIFT_MAX_RECV_DGRAM_SIZE, &vec, 1) < 0) {
276 print_error("error on evbuffer_reserve_space");
279 int length = recvfrom (sock, (char *)vec.iov_base, SWIFT_MAX_RECV_DGRAM_SIZE, 0,
280 (struct sockaddr*)&(addr.addr), &addrlen);
284 // Linux and Windows report "ICMP port unreachable" if the dest port could
286 // http://support.microsoft.com/kb/260018
287 // http://www.faqs.org/faqs/unix-faq/socket/
289 if (WSAGetLastError() == 10054) // Sometimes errno == 2 ?!
291 if (errno == ECONNREFUSED)
294 CloseChannelByAddress(addr);
297 print_error("error on recv");
299 vec.iov_len = length;
300 if (evbuffer_commit_space(evb, &vec, 1) < 0) {
302 print_error("error on evbuffer_commit_space");
304 global_dgrams_down++;
305 global_raw_bytes_down+=length;
311 void Channel::CloseSocket(evutil_socket_t sock) {
312 for(int i=0; i<sock_count; i++)
313 if (sock_open[i].sock==sock)
314 sock_open[i] = sock_open[--sock_count];
315 if (!close_socket(sock))
316 print_error("on closing a socket");
319 void Channel::Shutdown () {
321 CloseSocket(sock_open[sock_count].sock);
324 void swift::SetTracker(const Address& tracker) {
325 Channel::tracker = tracker;
328 int Channel::DecodeID(int scrambled) {
329 return scrambled ^ (int)start;
331 int Channel::EncodeID(int unscrambled) {
332 return unscrambled ^ (int)start;
336 * class Address implementation
339 void Address::set_ipv4 (const char* ip_str) {
340 struct hostent *h = gethostbyname(ip_str);
342 print_error("cannot lookup address");
345 addr.sin_addr.s_addr = *(u_long *) h->h_addr_list[0];
350 Address::Address(const char* ip_port) {
352 if (strlen(ip_port)>=1024)
355 strncpy(ipp,ip_port,1024);
356 char* semi = strchr(ipp,':');
362 if (strchr(ipp, '.')) {
364 set_port((uint16_t)0);
366 set_ipv4((uint32_t)INADDR_ANY);
373 uint32_t Address::LOCALHOST = INADDR_LOOPBACK;
381 const char* swift::tintstr (tint time) {
384 static char ret_str[4][32]; // wow
387 if (time==TINT_NEVER)
389 time -= Channel::epoch;
391 int hours = time/TINT_HOUR;
393 int mins = time/TINT_MIN;
395 int secs = time/TINT_SEC;
397 int msecs = time/TINT_MSEC;
399 int usecs = time/TINT_uSEC;
400 sprintf(ret_str[i],"%i_%02i_%02i_%03i_%03i",hours,mins,secs,msecs,usecs);
405 std::string swift::sock2str (struct sockaddr_in addr) {
408 //Vista only: InetNtop(AF_INET,&(addr.sin_addr),ipch,32);
410 struct in_addr inaddr;
411 memcpy(&inaddr, &(addr.sin_addr), sizeof(inaddr));
412 strncpy(ipch, inet_ntoa(inaddr),32);
414 inet_ntop(AF_INET,&(addr.sin_addr),ipch,32);
416 sprintf(ipch+strlen(ipch),":%i",ntohs(addr.sin_port));
417 return std::string(ipch);
422 * Swift top-level API implementation
425 int swift::Listen (Address addr) {
427 cb.may_read = &Channel::LibeventReceiveCallback;
428 cb.sock = Channel::Bind(addr,cb);
430 event_assign(&Channel::evrecv, Channel::evbase, cb.sock, EV_READ,
432 event_add(&Channel::evrecv, NULL);
436 void swift::Shutdown (int sock_des) {
440 int swift::Open (const char* filename, const Sha1Hash& hash, Address tracker, bool force_check_diskvshash, bool check_netwvshash, uint32_t chunk_size) {
441 FileTransfer* ft = new FileTransfer(filename, hash, force_check_diskvshash, check_netwvshash, chunk_size);
442 if (ft && ft->file().file_descriptor()) {
444 /*if (FileTransfer::files.size()<fdes) // FIXME duplication
445 FileTransfer::files.resize(fdes);
446 FileTransfer::files[fdes] = ft;*/
448 // initiate tracker connections
450 ft->SetTracker(tracker);
451 ft->ConnectToTracker();
453 return ft->file().file_descriptor();
462 void swift::Close (int fd) {
463 if (fd<FileTransfer::files.size() && FileTransfer::files[fd])
464 delete FileTransfer::files[fd];
468 void swift::AddPeer (Address address, const Sha1Hash& root) {
469 Channel::peer_selector->AddPeer(address,root);
473 uint64_t swift::Size (int fdes) {
474 if (FileTransfer::files.size()>fdes && FileTransfer::files[fdes])
475 return FileTransfer::files[fdes]->file().size();
481 bool swift::IsComplete (int fdes) {
482 if (FileTransfer::files.size()>fdes && FileTransfer::files[fdes])
483 return FileTransfer::files[fdes]->file().is_complete();
489 uint64_t swift::Complete (int fdes) {
490 if (FileTransfer::files.size()>fdes && FileTransfer::files[fdes])
491 return FileTransfer::files[fdes]->file().complete();
497 uint64_t swift::SeqComplete (int fdes) {
498 if (FileTransfer::files.size()>fdes && FileTransfer::files[fdes])
499 return FileTransfer::files[fdes]->file().seq_complete();
505 const Sha1Hash& swift::RootMerkleHash (int file) {
506 FileTransfer* trans = FileTransfer::file(file);
508 return Sha1Hash::ZERO;
509 return trans->file().root_hash();
513 /** Returns the number of bytes in a chunk for this transmission */
514 uint32_t swift::ChunkSize(int fdes)
516 if (FileTransfer::files.size()>fdes && FileTransfer::files[fdes])
517 return FileTransfer::files[fdes]->file().chunk_size();
524 void swift::Checkpoint(int transfer) {
525 // Save transfer's binmap for zero-hashcheck restart
526 FileTransfer *ft = FileTransfer::file(transfer);
530 std::string binmap_filename = ft->file().filename();
531 binmap_filename.append(".mbinmap");
532 //fprintf(stderr,"swift: checkpointing %s at %lli\n", binmap_filename.c_str(), Complete(transfer));
533 FILE *fp = fopen(binmap_filename.c_str(),"wb");
535 print_error("cannot open mbinmap for writing");
538 if (ft->file().serialize(fp) < 0)
539 print_error("writing to mbinmap");
549 int swift::evbuffer_add_string(struct evbuffer *evb, std::string str) {
550 return evbuffer_add(evb, str.c_str(), str.size());
553 int swift::evbuffer_add_8(struct evbuffer *evb, uint8_t b) {
554 return evbuffer_add(evb, &b, 1);
557 int swift::evbuffer_add_16be(struct evbuffer *evb, uint16_t w) {
558 uint16_t wbe = htons(w);
559 return evbuffer_add(evb, &wbe, 2);
562 int swift::evbuffer_add_32be(struct evbuffer *evb, uint32_t i) {
563 uint32_t ibe = htonl(i);
564 return evbuffer_add(evb, &ibe, 4);
567 int swift::evbuffer_add_64be(struct evbuffer *evb, uint64_t l) {
569 lbe[0] = htonl((uint32_t)(l>>32));
570 lbe[1] = htonl((uint32_t)(l&0xffffffff));
571 return evbuffer_add(evb, lbe, 8);
574 int swift::evbuffer_add_hash(struct evbuffer *evb, const Sha1Hash& hash) {
575 return evbuffer_add(evb, hash.bits, Sha1Hash::SIZE);
578 uint8_t swift::evbuffer_remove_8(struct evbuffer *evb) {
580 if (evbuffer_remove(evb, &b, 1) < 1)
585 uint16_t swift::evbuffer_remove_16be(struct evbuffer *evb) {
587 if (evbuffer_remove(evb, &wbe, 2) < 2)
592 uint32_t swift::evbuffer_remove_32be(struct evbuffer *evb) {
594 if (evbuffer_remove(evb, &ibe, 4) < 4)
599 uint64_t swift::evbuffer_remove_64be(struct evbuffer *evb) {
601 if (evbuffer_remove(evb, lbe, 8) < 8)
603 uint64_t l = ntohl(lbe[0]);
609 Sha1Hash swift::evbuffer_remove_hash(struct evbuffer* evb) {
610 char bits[Sha1Hash::SIZE];
611 if (evbuffer_remove(evb, bits, Sha1Hash::SIZE) < Sha1Hash::SIZE)
612 return Sha1Hash::ZERO;
613 return Sha1Hash(false, bits);