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>
16 #include "../kernel/mptp.h"
19 using namespace swift;
25 swift::tint now_t::now = Channel::Time();
26 tint Channel::start = now_t::now;
27 tint Channel::epoch = now_t::now/360000000LL*360000000LL; // make logs mergeable
28 uint64_t Channel::global_dgrams_up=0, Channel::global_dgrams_down=0,
29 Channel::global_raw_bytes_up=0, Channel::global_raw_bytes_down=0,
30 Channel::global_bytes_up=0, Channel::global_bytes_down=0;
31 sckrwecb_t Channel::sock_open[] = {};
32 int Channel::sock_count = 0;
33 swift::tint Channel::last_tick = 0;
34 int Channel::MAX_REORDERING = 4;
35 bool Channel::SELF_CONN_OK = false;
36 swift::tint Channel::TIMEOUT = TINT_SEC*60;
37 std::vector<Channel*> Channel::channels(1);
38 Address Channel::tracker;
39 //tbheap Channel::send_queue;
40 FILE* Channel::debug_file = NULL;
41 #include "ext/simple_selector.cpp"
42 PeerSelector* Channel::peer_selector = new SimpleSelector();
43 tint Channel::MIN_PEX_REQUEST_INTERVAL = TINT_SEC;
50 Channel::Channel (FileTransfer* transfer, int socket, Address peer_addr) :
51 // Arno, 2011-10-03: Reordered to avoid g++ Wall warning
52 peer_(peer_addr), socket_(socket==INVALID_SOCKET?default_socket():socket), // FIXME
53 transfer_(transfer), peer_channel_id_(0), own_id_mentioned_(false),
54 data_in_(TINT_NEVER,bin_t::NONE), data_in_dbl_(bin_t::NONE),
55 data_out_cap_(bin_t::ALL),hint_out_size_(0),
56 // Gertjan fix 996e21e8abfc7d88db3f3f8158f2a2c4fc8a8d3f
57 // "Changed PEX rate limiting to per channel limiting"
58 last_pex_request_time_(0), next_pex_request_time_(0),
59 pex_request_outstanding_(false), useless_pex_count_(0),
60 pex_requested_(false), // Ric: init var that wasn't initialiazed
62 rtt_avg_(TINT_SEC), dev_avg_(0), dip_avg_(TINT_SEC),
63 last_send_time_(0), last_recv_time_(0), last_data_out_time_(0), last_data_in_time_(0),
64 last_loss_time_(0), next_send_time_(0), cwnd_(1), cwnd_count1_(0), send_interval_(TINT_SEC),
65 send_control_(PING_PONG_CONTROL), sent_since_recv_(0),
66 lastrecvwaskeepalive_(false), lastsendwaskeepalive_(false), // Arno: nap bug fix
68 ack_not_rcvd_recent_(0), owd_min_bin_(0), owd_min_bin_start_(NOW),
69 owd_cur_bin_(0), dgrams_sent_(0), dgrams_rcvd_(0),
70 raw_bytes_up_(0), raw_bytes_down_(0), bytes_up_(0), bytes_down_(0),
71 scheduled4close_(false)
75 this->id_ = channels.size();
76 channels.push_back(this);
77 transfer_->hs_in_.push_back(bin_t(id_));
78 for(int i=0; i<4; i++) {
79 owd_min_bins_[i] = TINT_NEVER;
80 owd_current_[i] = TINT_NEVER;
82 evsend_ptr_ = new struct event;
83 evtimer_assign(evsend_ptr_,evbase,&Channel::LibeventSendCallback,this);
84 evtimer_add(evsend_ptr_,tint2tv(next_send_time_));
87 transfer->mychannels_.insert(this);
89 dprintf("%s #%u init channel %s\n",tintstr(),id_,peer_.str());
90 //fprintf(stderr,"new Channel %d %s\n", id_, peer_.str() );
94 Channel::~Channel () {
95 dprintf("%s #%u dealloc channel\n",tintstr(),id_);
100 if (transfer_ != NULL)
101 transfer_->mychannels_.erase(this);
105 void Channel::ClearEvents()
107 if (evsend_ptr_ != NULL) {
108 if (evtimer_pending(evsend_ptr_,NULL))
109 evtimer_del(evsend_ptr_);
118 bool Channel::IsComplete() {
119 // Check if peak hash bins are filled.
120 if (file().peak_count() == 0)
123 for(int i=0; i<file().peak_count(); i++) {
124 bin_t peak = file().peak(i);
125 if (!ack_in_.is_filled(peak))
133 uint16_t Channel::GetMyPort() {
134 struct sockaddr_in mysin = {};
135 socklen_t mysinlen = sizeof(mysin);
136 if (getsockname(socket_, (struct sockaddr *)&mysin, &mysinlen) < 0)
138 print_error("error on getsockname");
142 return ntohs(mysin.sin_port);
145 bool Channel::IsDiffSenderOrDuplicate(Address addr, uint32_t chid)
149 // Got message from different address than I send to
151 if (!own_id_mentioned_ && addr.is_private()) {
152 // Arno, 2012-02-27: Got HANDSHAKE reply from IANA private address,
153 // check for duplicate connections:
155 // When two peers A and B are behind the same firewall, they will get
156 // extB, resp. extA addresses from the tracker. They will both
157 // connect to their counterpart but because the incoming packet
158 // will be from the intNAT address the duplicates are not
161 // Solution: when the second datagram comes in (HANDSHAKE reply),
162 // see if you have had a first datagram from the same addr
163 // (HANDSHAKE). If so, close the channel if his port number is
164 // larger than yours (such that one channel remains).
168 Channel *c = transfer().FindChannel(addr,this);
170 // I already initiated a connection to this peer,
171 // this new incoming message would establish a duplicate.
172 // One must break the connection, decide using port
174 dprintf("%s #%u found duplicate channel to %s\n",
175 tintstr(),chid,addr.str());
177 if (addr.port() > GetMyPort()) {
179 dprintf("%s #%u closing duplicate channel to %s\n",
180 tintstr(),chid,addr.str());
187 // Received HANDSHAKE reply from other address than I sent
188 // HANDSHAKE to, and the address is not an IANA private
189 // address (=no NAT in play), so close.
191 dprintf("%s #%u invalid peer address %s!=%s\n",
192 tintstr(),chid,peer().str(),addr.str());
208 tint Channel::Time () {
209 //HiResTimeOfDay* tod = HiResTimeOfDay::Instance();
210 //tint ret = tod->getTimeUSec();
211 //DLOG(INFO)<<"now is "<<ret;
212 return now_t::now = usec_time();
216 evutil_socket_t Channel::Bind (Address address, sckrwecb_t callbacks) {
217 struct sockaddr_mptp *addr = address.addr;
219 int len = sizeof(struct sockaddr_mptp) + addr->count*sizeof(struct mptp_dest), sndbuf=1<<20, rcvbuf=1<<20;
220 #define dbnd_ensure(x) { if (!(x)) { \
221 print_error("binding fails"); close_socket(fd); return INVALID_SOCKET; } }
222 dbnd_ensure ( (fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_MPTP)) >= 0 );
223 dbnd_ensure( make_socket_nonblocking(fd) ); // FIXME may remove this
225 dbnd_ensure ( setsockopt(fd, SOL_SOCKET, SO_SNDBUF,
226 (setsockoptptr_t)&sndbuf, sizeof(int)) == 0 );
227 dbnd_ensure ( setsockopt(fd, SOL_SOCKET, SO_RCVBUF,
228 (setsockoptptr_t)&rcvbuf, sizeof(int)) == 0 );
229 //setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (setsockoptptr_t)&enable, sizeof(int));
230 dbnd_ensure ( ::bind(fd, (sockaddr*)&addr, len) == 0 );
233 sock_open[sock_count++] = callbacks;
237 Address Channel::BoundAddress(evutil_socket_t sock) {
239 struct sockaddr_in myaddr;
240 socklen_t mylen = sizeof(myaddr);
241 int ret = getsockname(sock,(sockaddr*)&myaddr,&mylen);
243 return Address(myaddr);
251 Address swift::BoundAddress(evutil_socket_t sock) {
252 return Channel::BoundAddress(sock);
256 int Channel::SendTo (evutil_socket_t sock, const Address& addr, struct evbuffer *evb) {
258 int length = evbuffer_get_length(evb);
259 int addr_len = sizeof(struct sockaddr_mptp) + addr.addr->count * sizeof(struct mptp_dest);
260 int r = sendto(sock,(const char *)evbuffer_pullup(evb, length),length,0,
261 (struct sockaddr*)&(addr.addr),addr_len);
263 print_error("can't send");
264 evbuffer_drain(evb, length); // Arno: behaviour is to pretend the packet got lost
267 evbuffer_drain(evb,r);
269 global_raw_bytes_up+=length;
274 int Channel::RecvFrom (evutil_socket_t sock, Address& addr, struct evbuffer *evb) {
275 socklen_t addrlen = sizeof(struct sockaddr_mptp) + addr.addr->count * sizeof(mptp_dest);
276 struct evbuffer_iovec vec;
277 if (evbuffer_reserve_space(evb, SWIFT_MAX_RECV_DGRAM_SIZE, &vec, 1) < 0) {
278 print_error("error on evbuffer_reserve_space");
281 int length = recvfrom (sock, (char *)vec.iov_base, SWIFT_MAX_RECV_DGRAM_SIZE, 0,
282 (struct sockaddr*)&(addr.addr), &addrlen);
286 // Linux and Windows report "ICMP port unreachable" if the dest port could
288 // http://support.microsoft.com/kb/260018
289 // http://www.faqs.org/faqs/unix-faq/socket/
291 if (WSAGetLastError() == 10054) // Sometimes errno == 2 ?!
293 if (errno == ECONNREFUSED)
296 CloseChannelByAddress(addr);
299 print_error("error on recv");
301 vec.iov_len = length;
302 if (evbuffer_commit_space(evb, &vec, 1) < 0) {
304 print_error("error on evbuffer_commit_space");
306 global_dgrams_down++;
307 global_raw_bytes_down+=length;
313 void Channel::CloseSocket(evutil_socket_t sock) {
314 for(int i=0; i<sock_count; i++)
315 if (sock_open[i].sock==sock)
316 sock_open[i] = sock_open[--sock_count];
317 if (!close_socket(sock))
318 print_error("on closing a socket");
321 void Channel::Shutdown () {
323 CloseSocket(sock_open[sock_count].sock);
326 void swift::SetTracker(const Address& tracker) {
327 Channel::tracker = tracker;
330 int Channel::DecodeID(int scrambled) {
331 return scrambled ^ (int)start;
333 int Channel::EncodeID(int unscrambled) {
334 return unscrambled ^ (int)start;
338 * class Address implementation
341 void Address::set_ipv4 (const char* ip_str) {
342 struct hostent *h = gethostbyname(ip_str);
344 print_error("cannot lookup address");
347 addr->dests[0].addr = *(u_long *) h->h_addr_list[0];
352 Address::Address(const char* ip_port) {
354 if (strlen(ip_port)>=1024)
357 strncpy(ipp,ip_port,1024);
358 char* semi = strchr(ipp,':');
364 if (strchr(ipp, '.')) {
366 set_port((uint16_t)0);
368 set_ipv4((uint32_t)INADDR_ANY);
375 uint32_t Address::LOCALHOST = INADDR_LOOPBACK;
383 const char* swift::tintstr (tint time) {
386 static char ret_str[4][32]; // wow
389 if (time==TINT_NEVER)
391 time -= Channel::epoch;
393 int hours = time/TINT_HOUR;
395 int mins = time/TINT_MIN;
397 int secs = time/TINT_SEC;
399 int msecs = time/TINT_MSEC;
401 int usecs = time/TINT_uSEC;
402 sprintf(ret_str[i],"%i_%02i_%02i_%03i_%03i",hours,mins,secs,msecs,usecs);
407 std::string swift::sock2str (struct sockaddr_in addr) {
410 //Vista only: InetNtop(AF_INET,&(addr.sin_addr),ipch,32);
412 struct in_addr inaddr;
413 memcpy(&inaddr, &(addr.sin_addr), sizeof(inaddr));
414 strncpy(ipch, inet_ntoa(inaddr),32);
416 inet_ntop(AF_INET,&(addr.sin_addr),ipch,32);
418 sprintf(ipch+strlen(ipch),":%i",ntohs(addr.sin_port));
419 return std::string(ipch);
424 * Swift top-level API implementation
427 int swift::Listen (Address addr) {
429 cb.may_read = &Channel::LibeventReceiveCallback;
430 cb.sock = Channel::Bind(addr,cb);
432 event_assign(&Channel::evrecv, Channel::evbase, cb.sock, EV_READ,
434 event_add(&Channel::evrecv, NULL);
438 void swift::Shutdown (int sock_des) {
442 int swift::Open (const char* filename, const Sha1Hash& hash, Address tracker, bool force_check_diskvshash, bool check_netwvshash, uint32_t chunk_size) {
443 FileTransfer* ft = new FileTransfer(filename, hash, force_check_diskvshash, check_netwvshash, chunk_size);
444 if (ft && ft->file().file_descriptor()) {
446 /*if (FileTransfer::files.size()<fdes) // FIXME duplication
447 FileTransfer::files.resize(fdes);
448 FileTransfer::files[fdes] = ft;*/
450 // initiate tracker connections
452 ft->SetTracker(tracker);
453 ft->ConnectToTracker();
455 return ft->file().file_descriptor();
464 void swift::Close (int fd) {
465 if (fd<FileTransfer::files.size() && FileTransfer::files[fd])
466 delete FileTransfer::files[fd];
470 void swift::AddPeer (Address address, const Sha1Hash& root) {
471 Channel::peer_selector->AddPeer(address,root);
475 uint64_t swift::Size (int fdes) {
476 if (FileTransfer::files.size()>fdes && FileTransfer::files[fdes])
477 return FileTransfer::files[fdes]->file().size();
483 bool swift::IsComplete (int fdes) {
484 if (FileTransfer::files.size()>fdes && FileTransfer::files[fdes])
485 return FileTransfer::files[fdes]->file().is_complete();
491 uint64_t swift::Complete (int fdes) {
492 if (FileTransfer::files.size()>fdes && FileTransfer::files[fdes])
493 return FileTransfer::files[fdes]->file().complete();
499 uint64_t swift::SeqComplete (int fdes) {
500 if (FileTransfer::files.size()>fdes && FileTransfer::files[fdes])
501 return FileTransfer::files[fdes]->file().seq_complete();
507 const Sha1Hash& swift::RootMerkleHash (int file) {
508 FileTransfer* trans = FileTransfer::file(file);
510 return Sha1Hash::ZERO;
511 return trans->file().root_hash();
515 /** Returns the number of bytes in a chunk for this transmission */
516 uint32_t swift::ChunkSize(int fdes)
518 if (FileTransfer::files.size()>fdes && FileTransfer::files[fdes])
519 return FileTransfer::files[fdes]->file().chunk_size();
526 void swift::Checkpoint(int transfer) {
527 // Save transfer's binmap for zero-hashcheck restart
528 FileTransfer *ft = FileTransfer::file(transfer);
532 std::string binmap_filename = ft->file().filename();
533 binmap_filename.append(".mbinmap");
534 //fprintf(stderr,"swift: checkpointing %s at %lli\n", binmap_filename.c_str(), Complete(transfer));
535 FILE *fp = fopen(binmap_filename.c_str(),"wb");
537 print_error("cannot open mbinmap for writing");
540 if (ft->file().serialize(fp) < 0)
541 print_error("writing to mbinmap");
551 int swift::evbuffer_add_string(struct evbuffer *evb, std::string str) {
552 return evbuffer_add(evb, str.c_str(), str.size());
555 int swift::evbuffer_add_8(struct evbuffer *evb, uint8_t b) {
556 return evbuffer_add(evb, &b, 1);
559 int swift::evbuffer_add_16be(struct evbuffer *evb, uint16_t w) {
560 uint16_t wbe = htons(w);
561 return evbuffer_add(evb, &wbe, 2);
564 int swift::evbuffer_add_32be(struct evbuffer *evb, uint32_t i) {
565 uint32_t ibe = htonl(i);
566 return evbuffer_add(evb, &ibe, 4);
569 int swift::evbuffer_add_64be(struct evbuffer *evb, uint64_t l) {
571 lbe[0] = htonl((uint32_t)(l>>32));
572 lbe[1] = htonl((uint32_t)(l&0xffffffff));
573 return evbuffer_add(evb, lbe, 8);
576 int swift::evbuffer_add_hash(struct evbuffer *evb, const Sha1Hash& hash) {
577 return evbuffer_add(evb, hash.bits, Sha1Hash::SIZE);
580 uint8_t swift::evbuffer_remove_8(struct evbuffer *evb) {
582 if (evbuffer_remove(evb, &b, 1) < 1)
587 uint16_t swift::evbuffer_remove_16be(struct evbuffer *evb) {
589 if (evbuffer_remove(evb, &wbe, 2) < 2)
594 uint32_t swift::evbuffer_remove_32be(struct evbuffer *evb) {
596 if (evbuffer_remove(evb, &ibe, 4) < 4)
601 uint64_t swift::evbuffer_remove_64be(struct evbuffer *evb) {
603 if (evbuffer_remove(evb, lbe, 8) < 8)
605 uint64_t l = ntohl(lbe[0]);
611 Sha1Hash swift::evbuffer_remove_hash(struct evbuffer* evb) {
612 char bits[Sha1Hash::SIZE];
613 if (evbuffer_remove(evb, bits, Sha1Hash::SIZE) < Sha1Hash::SIZE)
614 return Sha1Hash::ZERO;
615 return Sha1Hash(false, bits);