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Rakshasa libtorrent example

Опубликовано 03.05.2020, автор: Zulrajas

rakshasa libtorrent example

compiled if the user wishes to avoid using OpenSSL. Author: rakshasa. Source Code: torentjuk.space License: GPL License · #cpluplus. In this tutorial, you will learn everything about ruTorrent. From how to install it, use it, and optimize it. Become an expert in 7 minutes. Homepage, torentjuk.space License, GPLor-later. Maintainer, Nathan Owens. Download size, KB. ADICIONAR PEERS NO UTORRENT FOR IPAD How envelope file, la. DisplayVersion the article the uninstall setup uses attempting VPN. Third party firewall applications, folder than to android which. This must followed how question fans, for.

It can also use an optional file typically called 'config. Caching is disabled by. If you need to do unusual things to compile the package, please try. If you are using the cache, and at. The file 'configure. You need 'configure. The simplest way to compile this package is:. Running 'configure' might take a while.

While running, it prints. Type 'make' to compile the package. Optionally, type 'make check' to run any self-tests that come with. Type 'make install' to install the programs and any data files and. When installing into a prefix owned by root, it is. Optionally, type 'make installcheck' to repeat any self-tests, but. This target does not install anything. Running this target as a. You can remove the program binaries and object files from the. To also remove the. There is.

If you use it, you may have to get. Often, you can also type 'make uninstall' to remove the installed. In practice, not all packages have tested that. Some packages, particularly those that use Automake, provide 'make. This target is generally not run by end users. Some systems require unusual options for compilation or linking that. Run '. You can give 'configure' initial values for configuration parameters.

Here is. You can compile the package for more than one kind of computer at the. To do this, you can use GNU 'make'. This is known. With a non-GNU 'make', it is safer to compile the package for one. After you have. On MacOS X This is not guaranteed to produce working output in all cases, you. By default, 'make install' installs the package's commands under. You can specify separate installation prefixes for. If you.

Documentation and other data files still use the regular prefix. In addition, if you use an unusual directory layout you can give. Run 'configure --help' for a list of the directories. In general, the default. The most portable way to affect installation locations is to pass the. The first method involves providing an override variable for each. For example, 'make install. Any directories that were specified during 'configure',.

The approach of makefile. Coding Standards, and ideally causes no recompilation. However, some. The approach of. On the other hand,. If the package supports it, you can cause programs to be installed. For packages that use the X Window System, 'configure' can usually. Some packages offer the ability to configure how verbose the. For these packages, running '. The send buffer is then encrypted with the peer specific key and chained onto the iovec for sending. This means there is one userspace copy in order to allow unaligned peer requests and peer-specific encryption.

The piece picker is a central component in a bittorrent implementation. The piece picker in libtorrent is optimized for quickly finding the rarest pieces. It keeps a list of all available pieces sorted by rarity, and pieces with the same rarity shuffled. The rarest first mode is the dominant piece picker mode. Other modes are supported as well and used by peers in specific situations. The piece picker allows to combine the availability of a piece with a priority. Together they determine the sort order of the piece list.

Pieces with priority 0 will never be picked, which is used for the selective download feature. In order to have as few partially finished pieces as possible, peers have an affinity towards picking blocks from the same pieces as other peers in the same speed category.

The speed category is a coarse categorization of peers based on their download rate. This makes slow peers pick blocks from the same piece, and fast peers pick from the same piece, and hence decreasing the likelihood of slow peers blocking the completion of pieces. Merkle hash tree torrents is an extension that lets a torrent file only contain the root hash of the hash tree forming the piece hashes.

It will only grow with the number of files since it still has to contain the file names. With regular torrents, clients have to request multiple blocks for pieces, typically from different peers, before the data can be verified against the piece hash. The larger the pieces are, the longer it will take to download a complete piece and verify it. Before the piece is verified, it cannot be shared with the swarm, which means the larger piece sizes, the slower turnaround data has when it is downloaded by peers.

Since on average the data has to sit around, waiting, in client buffers before it has been verified and can be uploaded again. Another problem with large piece sizes is that it is harder for a client to pinpoint the malicious or buggy peer when a piece fails, and it will take longer to re-download it and take more tries before the piece succeeds the larger the pieces are. The piece size in regular torrents is a tradeoff between the size of the.

Often, for files that are 4 GB, the piece size is 2 or 4 MB, just to avoid making the. Merkle torrents solves these problems by removing the tradeoff between. With merkle torrents, the piece size can be the minimum block size 16 KB , which lets peers verify every block of data received from peers, immediately.

This gives a minimum turnaround time and completely removes the problem of identifying malicious peers. From Wikipedia, the free encyclopedia. Not to be confused with libTorrent. This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. This section may be confusing or unclear to readers.

Please help clarify the section. There might be a discussion about this on the talk page. March Learn how and when to remove this template message. Free and open-source software portal. Retrieved 4 Dec Archived from the original on Retrieved February 4, Archived from the original on February 5, Retrieved February 5, — via GitHub.

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It should only allocate the memory when the peer is actually transferring data. If the chunk isn't useful as a cache hit, then the memory should be de-allocated when the peer isn't talking again. It's sending an empty event same as on regular update. I am using a build compiled from this commit and linked to this version of the library.

I'd like to try correcting this error myself but am having difficulty following the code. Do you have any suggestions on where to look? Tpo -c -o block. Tpo -c block. This file doesn't exist in the archive. It doesn't exist on my server. It doesn't exist anywhere in any of Debian's packages.

Running Debian 6. I do currently have 0. This is happening when i try to compile 0. Everything worked fine 19 hours ago, but it's impossible to build since the last update. Here's the error :. Libtorrent allows an arbitrary number of leading zeros on bytestrings in Bencode decoding; I can see some potential for buffer overflow here.

Bytestrings should not have leading zeros ever because you'll never have a 0 length bytestring although the Bittorrent 'spec' allows you to express something like i0e which is meaningless. I've got an exception on tab completion when there is more than one result.

With one possible result it works ok. Expected to list all relevant filenames in folder. Using FreeBSD 8. SHA: cd5b. Could raw string maybe sanitized or only characters of it received from server be shown in case of bencoded data parsing failure? A declarative, efficient, and flexible JavaScript library for building user interfaces.

JavaScript JS is a lightweight interpreted programming language with first-class functions. A server is a program made to process requests and deliver data to clients. Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently. We are working to build community through open source technology. NB: members must have two-factor auth. Coder Social home page Coder Social Search. Forkers yekm Lky Belgarion SineSwiper yelirekim axlash extravagant corefan artifexor neuhaus niun eoyslebo nullren georgehank nylen daemonpnz mokerjoke raxen g2p liliforcomputer sallyswiss callipigeon rubyeye37 antonyantony d3vgru jonathandb PiotrKa kali-co-kr blaenk yodamaster LiuGuiRong agwblack Joni-Lover pyhalov inste Distrotech smunix davereikher agomonos andyattebery W1nst0n theeternalsw0rd andrecurvello flygoast otechnology zhangzewen zhaphod bryanwparker DevGitter trocker natanovia chrismin ingmarv ImmortalJ weedy wudijimao prodigeni KMhook lyase lzpfmh hfeeki mrvn ahnan4arch asbjorn ckehin embicoin zccicy eyedeekay tempbottle danielthegray hookborealis inuyasha RobertBorg vcorem debjit nelsont zyl dbohry dcposch cardmaster jurnho guddimon- memoz zugo83 EdwardBetts X-cela hyuni flashbuckets youjava crazyevent MiGameCenter pwueje rainlandlee pyroscope goobsmcgee duckybsd ShiningPluto jackyglony mashua.

Does libtorrent implement NAT traversal or are there plans to do so? Tpo" ". Po"; else rm -f ". Tested on 0. Tpo -c -o log. Tpo -c log. Best regards, Christian. First, I tried to run autogen. See the Autoconf documentation. Hi, I tried to compile directly on qemu-arm libtorrent for armel but I got the following problem Hi, I just tried compiling libtorrent I grabbed today from git and it's failing on me.

I'm running Slackware I have this line in my configuration. Where do I find it? Hi, Everything worked fine 19 hours ago, but it's impossible to build since the last update. To recap: dhellohelloe shouldn't be accepted. Modify a. This results in the completed event never being reported to the tracker.

For example I have the following torrents in my folder: ubuntu Because it can take a few second for it to finish. In case you want to destruct the session asynchronously, you can request a session destruction proxy. If you don't do this, the destructor of the session object will block while the trackers are contacted. The only valid operation is calling the destructor:. The flags argument is used to filter which parts of the session state to save or load. When saving settings, there are two fields that are not loaded.

Returning true means it should be included and false means excluded. Since pred is guaranteed to be called for every torrent, it may be used to count the number of torrents of different categories as well. This can save a significant amount of time if you have a lot of torrents. Only torrents who has the state subscription flag set will be included.

This flag is on by default. For more information, see the session statistics section. It is also used to abort a torrent. Pausing the session has the same effect as pausing every torrent in it, except that torrents will not be resumed by the auto-manage mechanism. Resuming will restore the torrents to their previous paused state. A torrent is inactive if it is paused or if the session is paused. This function enables dynamic loading of torrent files.

When a torrent is unloaded but needs to be available in memory, this function is called from within the libtorrent network thread. From within this thread, you can not use any of the public APIs of libtorrent itself. In such case, the torrent itself is stopped and set to an error state with the corresponding error code. Given that the function is called from the internal network thread of libtorrent, it's important to not stall. This may significantly reduce the cost of this call.

Since the dht storage is a critical component for the dht behavior, this function will only be effective the next time the dht is started. If you never touch this feature, a default map-memory based storage is used. That endpoint will be pinged, and if a valid DHT reply is received, the node will be added to the routing table.

It's just the SHA-1 hash of the bencoded form of the structure. The key is the public key the blob is to be stored under. The optional salt argument is a string that is to be mixed in with the key when determining where in the DHT the value is to be stored. The callback function is called from within the libtorrent network thread once we've found where to store the blob, possibly with the current value stored under the key. The values passed to the callback functions are:.

Since the callback function cb is called from within libtorrent, it is critical to not perform any blocking operations. Ideally not even locking a mutex. Pass any data required for this function along with the function object's context and make the function entirely self-contained. The only reason data blob's value is computed via a function instead of just passing in the new value is to avoid race conditions. If you want to update the value in the DHT, you must first retrieve it, then modify it, then write it back.

The way the DHT works, it is natural to always do a lookup before storing and calling the callback in between is convenient. Send an arbitrary DHT request directly to the specified endpoint. This function is intended for use by plugins. Since this alert is a response to an explicit call, it will always be posted, regardless of the alert mask.

This function adds an extension to this session. To write custom plugins, see libtorrent plugins. For the typical bittorrent client all of these extensions should be added. The main plugins implemented in libtorrent are:. Sets a filter that will be used to reject and accept incoming as well as outgoing connections based on their originating ip address. The default filter will allow connections to any ip address. When anonymous mode is set the peer ID is randomized per peer.

If it's not set, it is initialized by libtorrent. The key may be used by the tracker to identify the peer potentially across you changing your IP. Sets the peer class filter for this session. All new peer connections will take this into account and be added to the peer classes specified by this filter, based on the peer's IP address.

Each bit in that 32 bit integer represents a peer class. The least significant bit represents class 0, the next bit class 1 and so on. For example, to make all peers in the range This function is limited to only peer class , since there are only 32 bits in the IP range mapping.

Only the set bits matter; no peer class will be removed from a peer as a result of this call, peer classes are only added. For more information, see peer classes. Sets and gets the peer class type filter. This is controls automatic peer class assignments to peers based on what kind of socket it is.

It does not only support assigning peer classes, it also supports removing peer classes based on socket type. Creates a new peer class see peer classes with the given name. The returned integer is the new peer class identifier.

Peer classes may have the same name, so each invocation of this function creates a new class and returns a unique identifier. Identifiers are assigned from low numbers to higher. For more information on peer classes, see peer classes. This call dereferences the reference count of the specified peer class. When creating a peer class it's automatically referenced by 1.

If you want to recycle a peer class, you may call this function. You may only call this function once per peer class you create. Calling it more than once for the same class will lead to memory corruption. Since peer classes are reference counted, this function will not remove the peer class if it's still assigned to torrents or peers.

It will however remove it once the last peer and torrent drops their references to it. There is no need to call this function for custom peer classes. All peer classes will be properly destructed when the session object destructs. These functions queries information from a peer class and updates the configuration of a peer class, respectively.

There is no option to only update a single property. A peer or torrent belonging to more than one class, the highest priority among any of its classes is the one that is taken into account. This operation cannot fail. The optional second argument options can be used to delete all the files downloaded by this torrent.

This is an asynchronous operation that will return immediately and actually apply the settings to the main thread of libtorrent some time later. Alerts is the main mechanism for libtorrent to report errors and events. You may not delete the alert objects.

Doing this requires manual synchronization between the popping threads. If an alert is available at the time of the call, it returns immediately. The returned alert pointer is the head of the alert queue. The first time will pop it and the second will free it.

The alert queue in the session will not grow indefinitely. Make sure to pop periodically to not miss notifications. Some alerts are considered so important that they are posted even when the alert queue is full. This function is called from within libtorrent, it may be the main thread, or it may be from within a user call. For instance, it could signal an eventfd, post a message to an HWND or some other main message pump.

The actual retrieval of alerts should not be done in the callback. In fact, the callback should not block. It should not perform any expensive work. It really should just notify the main application thread. The return value is a handle referring to the port mapping that was just created. This function is intended only for use by plugins. This type does not have a stable API and should be relied on as little as possible.

Who we requested it from and how far along we are at downloading it. One for each block in the piece. This is a pointer that points to an array that's owned by the session object. You will usually have to store your torrent handles somewhere, since it's the object through which you retrieve information about the torrent and aborts the torrent.

Any member function that returns a value or fills in a value has to be made synchronously. This means it has to wait for the main thread to complete the query before it can return. This might potentially be expensive if done from within a GUI thread that needs to stay responsive. Try to avoid querying for information you don't need, and try to do it in as few calls as possible. The default constructor will initialize the handle to an invalid state. Which means you cannot perform any operation on it, unless you first assign it a valid handle.

Since the torrents are processed by a background thread, there is no guarantee that a handle will remain valid between two calls. This function will write data to the storage as piece piece , as if it had been downloaded from a peer. The data in the buffer is copied and passed on to the disk IO thread to be written at a later point. By default, data that's already been downloaded is not overwritten by this buffer.

This will instruct libtorrent to overwrite any data that may already have been downloaded with this data. This function starts an asynchronous read operation of the specified piece from this torrent. You must have completed the download of the specified piece before calling this function. Note that if you read multiple pieces, the read operations are not guaranteed to finish in the same order as you initiated them. Each entry in the vector contains information about that particular peer.

Some information in there is relatively expensive to calculate, and if you're not interested in it and see performance issues , you can filter them out. By default everything is included. This function sets or resets the deadline associated with a specific piece index index. This is not necessarily possible, but pieces with a more recent deadline will always be prioritized over pieces with a deadline further ahead in time.

The deadline and flags of a piece can be changed by calling this function again. If it hasn't already been downloaded, it will no longer be considered a priority. This sets the bandwidth priority of this torrent. The priority of a torrent determines how much bandwidth its peers are assigned when distributing upload and download rate quotas. A high number gives more bandwidth. The priority must be within the range [0, ].

Torrents with higher priority will not necessarily get as much bandwidth as they can consume, even if there's is more quota. Other peers will still be weighed in when bandwidth is being distributed. With other words, bandwidth is not distributed strictly in order of priority, but the priority is used as a weight. Peers whose Torrent has a higher priority will take precedence when distributing unchoke slots.

This is a strict prioritisation where every interested peer on a high priority torrent will be unchoked before any other, lower priority, torrents have any peers unchoked. This function fills in the supplied vector with the the number of bytes downloaded of each file in this torrent.

This operation is not very cheap. Where n is the number of files, m is the number of downloading pieces and j is the number of blocks in a piece. The flags parameter can be used to specify the granularity of the file progress. If left at the default value of 0, the progress will be as accurate as possible, but also more expensive to calculate.

When specifying piece granularity, the operation is a lot cheaper, since libtorrent already keeps track of this internally and no calculation is required. This function fills in the passed in vector with status about files that are open for this torrent. Any file that is not open in this torrent, will not be reported in the vector, i. If the torrent is in an error state i. The announce entry contains both a string url which specify the announce url for the tracker as well as an int tier , which is specifies the order in which this tracker is tried.

If it is, it doesn't do anything. The updated set of trackers will be saved in the resume data, and when a torrent is started with resume data, the trackers from the resume data will replace the original ones. If the given url already exists in that list, the call has no effect. The torrent will connect to the server and try to download pieces from it, unless it's paused, queued, checking or seeding.

Note that URLs that fails may be removed automatically from the list. See http seeding for more information. The ext argument is a function that will be called from within libtorrent's context passing in the internal torrent object and the specified userdata pointer. The buffer passed in will be hashed and verified against the info-hash. The function returns true if the metadata is successfully set on the torrent, and false otherwise. If the torrent already has metadata, this function will not affect the torrent, and false will be returned.

Returns true if this handle refers to a valid torrent and false if it hasn't been initialized or if the torrent it refers to has been aborted. Note that a handle may become invalid after it has been added to the session. When a torrent is paused, it will however remember all share ratios to all peers and remember all potential not connected peers. Torrents may be paused automatically if there is a file error e.

The torrent will not accept any more requests and will disconnect all idle peers. As soon as a peer is done transferring the blocks that were requested from it, it is disconnected. This is a graceful shut down of the torrent in the sense that no downloaded bytes are wasted. Torrents that are auto-managed may be automatically resumed again. It does not make sense to pause an auto-managed torrent without making it not auto-managed first.

Torrents are auto-managed by default when added to the session. For more information, see queuing. When this flag is set, the torrent will force stop whenever it transitions from a non-data-transferring state into a data-transferring state referred to as being ready to download or seed. This is useful for torrents that should not start downloading or seeding yet, but want to be made ready to do so.

A torrent may need to have its files checked for instance, so it needs to be started and possibly queued for checking auto-managed and started but as soon as it's done, it should be stopped. Force stopped means auto-managed is set to false and it's paused. Note that the torrent may transition into a downloading state while calling this function, and since the logic is edge triggered you may miss the edge. To avoid this race, if the torrent already is in a downloading state when this call is made, it will trigger the stop-when-ready immediately.

When the stop-when-ready logic fires, the flag is cleared. Any subsequent transitions between downloading and non-downloading states will not be affected, until this function is used to set it again. The behavior is more robust when setting this flag as part of adding the torrent.

Explicitly sets the upload mode of the torrent. In upload mode, the torrent will not request any pieces. Torrents are automatically put in upload mode whenever they encounter a disk write error. Enable or disable share mode for this torrent. When in share mode, the torrent will not necessarily be downloaded, especially not the whole of it. Only parts that are likely to be distributed to more than 2 other peers are downloaded, and only if the previous prediction was correct.

Instructs libtorrent to flush all the disk caches for this torrent and close all file handles. Set to true to apply the session global IP filter to this torrent which is the default. Set to false to make this torrent ignore the IP filter. All peers will be disconnected and the torrent will stop announcing to the tracker.

The torrent will be added to the checking queue, and will be checked all the files will be read and compared to the piece hashes. Once the check is complete, the torrent will start connecting to peers again, as normal. The flags argument is a bitmask of flags ORed together. Note that by the time you receive the fast resume data, it may already be invalid if the torrent is still downloading!

The recommended practice is to first pause the session , then generate the fast resume data, and then close it down. There's no need to pause when saving intermittent resume data. If you pause every torrent individually instead of pausing the session , every torrent will have its paused state saved in the resume data! The resume data contains the modification timestamps for all files.

If one file has been modified when the torrent is added again, the will be rechecked. When shutting down, make sure to flush the disk cache before saving the resume data. This will make sure that the file timestamps are up to date and won't be modified after saving the resume data. The recommended way to do this is to pause the torrent, which will flush the cache and disconnect all peers. It is typically a good idea to save resume data whenever a torrent is completed or paused.

In those cases you don't need to pause the torrent or the session , since the torrent will do no more writing to its files. If you save resume data for torrents when they are paused, you can accelerate the shutdown process by not saving resume data again for paused torrents.

Completed torrents should have their resume data saved when they complete and on exit, since their statistics might be updated. It also means that if the resume data is out dated, libtorrent will not re-check the files, but assume that it is fairly recent. The assumption is that it's better to loose a little bit than to re-check the entire file. It is still a good idea to save resume data periodically during download as well as when closing down.

This is deliberate, otherwise there is a race condition for torrents that was just asked to save their resume data, they posted the alert , but it has not been received yet. Those torrents would report that they don't need to save resume data again, and skipped by the initial loop, and thwart the counter otherwise. This function returns true if any whole chunk has been downloaded since the torrent was first loaded or since the last time the resume data was saved. When saving resume data periodically, it makes sense to skip any torrent which hasn't downloaded anything since the last time.

A torrent's resume data is considered saved as soon as the alert is posted. It is important to make sure this alert is received and handled in order for this function to be meaningful. For more info, see queuing. Every torrent that is added is assigned a queue position exactly one greater than the greatest queue position of all existing torrents. Torrents that are being seeded have -1 as their queue position, since they're no longer in line to be downloaded.

When a torrent is removed or turns into a seed, all torrents with greater queue positions have their positions decreased to fill in the space in the sequence. The torrents with the smallest numbers are the ones that are being downloaded. The smaller number, the closer the torrent is to the front of the line to be started. Up means closer to the front and down means closer to the back of the queue. Top and bottom refers to the front and the back of the queue respectively.

The relative order of all other torrents remain intact but their numerical queue position shifts to make space for this torrent's new position. For SSL torrents, use this to specify a path to a. The certificate must be signed by the certificate in the.

This overload is only available when libtorrent is built against boost 1. This must be in. You can generate this file using the openssl command like this: openssl dhparam -outform PEM -out dhparams. Note that when a torrent first starts up, and it needs a certificate, it will suspend connecting to any peers until it has one. It's typically desirable to resume the torrent after setting the SSL certificate. If you don't have a cert you won't be allowed to connect to any peers. Returns the storage implementation for this torrent.

If the torrent doesn't have metadata, the pointer will not be initialized i. The torrent may be in a state without metadata only if it was started without a. The piece availability is the number of peers that we are connected that has advertised having a particular piece. This is the information that libtorrent uses in order to prefer picking rare pieces. These functions are used to set and get the priority of individual pieces. By default all pieces have priority 4. That means that the random rarest first algorithm is effectively active for all pieces.

You may however change the priority of individual pieces. There are 8 priority levels. Otherwise, lower priority values means less likely to be picked. Piece priority takes precedence over piece availability. Every piece with priority 7 will be attempted to be picked before a priority 6 piece and so on.

Piece priorities can not be changed for torrents that have not downloaded the metadata yet. For instance, magnet links and torrents added by URL won't have metadata immediately. All the piece priorities will be updated with the priorities in the vector. Each pair is piece, priority. That is, the first item is the piece index and the second item is the priority of that piece. Invalid entries, where the piece index or priority is out of range, are not allowed.

Each element is the current priority of that piece. Each entry is the priority of that file. The function sets the priorities of all the pieces in the torrent based on the vector. Whenever a file priority is changed, all other piece priorities are reset to match the file priorities. You cannot set the file priorities on a torrent that does not yet have metadata or a torrent that is a seed. The seconds argument specifies how many seconds from now to issue the tracker announces.

This is to honor trackers minimum re-announce interval settings. If set to -1 which is the default , all trackers are re-announce. A scrape request queries the tracker for statistics such as total number of incomplete peers, complete peers, number of downloads etc. It is given as the number of bytes per second the torrent is allowed to upload. The torrent can never upload more than the global rate limit. Local peers are not rate limited by default.

A pinned torrent may not be unloaded by libtorrent. When the dynamic loading and unloading of torrents is enabled by setting a load function on the session , this can be used to exempt certain torrents from the unloading logic. Magnet links, and other torrents that start out without having metadata are pinned automatically. This is to give the client a chance to get the metadata and save it before it's unloaded. In this case, it may be useful to unpin the torrent once its metadata has been saved to disk.

For more information about dynamically loading and unloading torrents, see dynamic loading of torrent files. When enabled, the piece picker will pick pieces in sequence instead of rarest first. In this mode, piece priorities are ignored, with the exception of priority 7, which are still preferred over the sequential piece order. Enabling sequential download will affect the piece distribution negatively in the swarm.

It should be used sparingly. If the peer does not respond, or is not a member of this torrent, it will simply be disconnected. No harm can be done by using this other than an unnecessary connection attempt is made. The second optional argument will be bitwise ORed into the source mask of this peer.

If you set this to -1, there will be no limit. This defaults to infinite. If all connections are used up, incoming connections may be refused or poor connections may be closed. This must be at least 2. The default is unlimited number of connections. If -1 is given to the function, it means unlimited. Moves the file s that this torrent are currently seeding from or downloading to. This will block all other disk IO, and other torrents download and upload rates may drop while copying the file.

Since disk IO is performed in a separate thread, this operation is also asynchronous. If it would, it will fail. Note that there is an inherent race condition here. If the files in the target directory appear after the check but before the copy or move completes, they will be overwritten. The intention is that a client may use this as a probe, and if it fails, ask the user which mode to use. The source files will still be removed in that case. Files that have been renamed to have absolute paths are not moved by this function.

Keep in mind that files that don't belong to the torrent but are stored in the torrent's directory may be moved as well. This goes for files that have been renamed to absolute paths that still end up inside the save path. Renames the file with the given index asynchronously.

The torrent needs to be a seed for this to take effect. If this handle is to a torrent that hasn't loaded yet for instance by being added by a URL, the returned value is undefined. This function is intended only for use by plugins and the alert dispatch function. It is essentially a URL with some state associated with it. The constructor that takes an info-hash will initialize the info-hash to the given value, but leave all other fields empty.

This is used internally when downloading torrents without the metadata. The metadata will be created by libtorrent as soon as it has been downloaded from the swarm. To load an ordinary. The version that takes a buffer pointer and a size will decode it as a. The version that takes a filename will simply load the torrent file and decode it inside the constructor, for convenience.

This might not be the most suitable for applications that want to be able to report detailed errors on what might go wrong. There is an upper limit on the size of the torrent file that will be loaded by the overload taking a filename. If it's important that even very large torrent files are loaded, use one of the other overloads. These overloads are not available when building without exception support.

This is used by the web server connection, which needs to request files with the original names. Renames a the file with the specified index to the new name. Remaps the file storage to a new file layout. This can be used to, for instance, download all data in a torrent to a single file, or to a number of fixed size sector aligned files, regardless of the number and sizes of the files in the torrent.

The tier determines the order in which the trackers are to be tried. Each announce entry contains a string, which is the tracker url, and a tier index. The tier index is the high-level priority. No matter which trackers that works or not, the ones with lower tier will always be tried before the one with higher tier number. These two functions are related to BEP 38 mutable torrents. The vectors returned from these correspond to the "similar" and "collections" keys in the.

Both info-hashes and collections from within the info-dict and from outside of it are included. Currently, the only transport protocol supported for the url is http. If set, it will override any username and password found in the URL itself. This function will map a piece index, a byte offset within that piece and a size in bytes into the corresponding files with offsets where that data for that piece is supposed to be stored.

This function will map a range in a specific file into a range in the torrent. The input range is assumed to be valid within the torrent. Otherwise returns an empty string. The certificate is the the public certificate in x format. This is primarily used to determine if a magnet link has had its metadata resolved yet or not. This is determined by whether or not it has a tracker whose URL domain name ends with ".

Note that the string is not null-terminated. You need to set the merkle tree for a torrent that you've just created as a merkle torrent. Once it's added to libtorrent, the merkle tree will be persisted in the resume data. If there's no comment, it will return an empty string. If there's no time stamp in the torrent file, the optional object will be uninitialized. If there is no creator string it will return an empty string. If this torrent contains any DHT nodes, they are put in this vector in their original form host name and port number.

This is used when creating torrent. Use this to add a known DHT node. It may be used, by the client, to bootstrap into the DHT network. This is used when loading a torrent from a magnet link for instance, where we only have the info-dict. This function looks up keys from the info-dictionary of the loaded torrent file. It can be used to access extension values put in the. If the specified key cannot be found, it returns NULL. When floating point operations are disabled, this is the only alternative to the floating point value in progress.

Divide this number by to get the fraction. If we are a seed, the piece picker is deallocated as an optimization, and piece availability is no longer tracked. In this case the distributed copies members are set to This is a floating point representation of the distributed copies. The DHT storage interface is a pure virtual class that can be implemented to customize how the data for the DHT is stored.

The default storage implementation uses three maps in RAM to save the peers, mutable and immutable items and it's designed to provide a fast and fully compliant behavior of the BEPs. For future implementers: If the torrent tracked contains a name, such a name must be stored as a string in peers["n"].

If noseed is true only peers marked as no seed should be included. The length of this value should have a maximum length in the final storage. The default implementation truncate the value for a maximum of 50 characters. For future implementers: The value should be returned as an entry in the key item["v"]. Store the item's data.

This layer is only for storage. The authentication of the item is performed by the upper layer. For implementers: This data can be stored only if the target is not already present. For implementers: The item sequence should be stored in the key item["seq"]. For implementers: The sequence number should be checked if the item is already present. This is a utility function to produce a client ID fingerprint formatted to the most common convention. The name string should contain exactly two characters.

These are the characters unique to your client, used to identify it. Make sure not to clash with anybody else. Here are some taken id's:. There's an informal directory of client id's here. The major , minor , revision and tag parameters are used to identify the version of your client.

The overload taking a std::string converts binary the string s to hexadecimal representation and returns it. The caller is responsible for making sure the buffer pointed to by out is large enough, i. The binary output is written to the buffer pointed to by out. The caller is responsible for making sure the buffer at out has enough space for the result to be written to, i. Generates a magnet URI from the specified torrent. If the torrent handle is invalid, an empty string is returned. For more information about magnet links, see magnet links.

This free function returns the list of available metrics exposed by libtorrent's statistics API. Each metric has a name and a value index. The caller is responsible for allocating the destination buffer that's passed in as the sig argument. Typically it would be allocated on the stack.

These can be general extensions for transferring metadata or peer exchange extensions, or it could be used to provide a way to customize the protocol to fit a particular closed network. In short, the plugin interface makes it possible to:. Writing your own plugin is a very easy way to introduce serious bugs such as dead locks and race conditions. Since a plugin has access to internal structures it is also quite easy to sabotage libtorrent's operation.

All the callbacks in this interface are called with the main libtorrent thread mutex locked. And they are always called from the libtorrent network thread. In case portions of your plugin are called from other threads, typically the main thread, you cannot use any of the member functions on the internal structures in libtorrent, since those require the mutex to be locked.

Furthermore, you would also need to have a mutex on your own shared data within the plugin , to make sure it is not accessed at the same time from the libtorrent thread through a callback. See boost thread's mutex. If you need to send out a message from another thread, it is advised to use an internal queue, and do the actual sending in tick. Since the plugin interface gives you easy access to internal structures, it is not supported as a stable API. Plugins should be considered specific to a specific version of libtorrent.

Although, in practice the internals mostly don't change that dramatically. The plugin interface consists of three base classes that the plugin may implement. These plugins are instantiated for each session , torrent and possibly each peer, respectively. If it is a null pointer, the extension is simply ignored for this torrent. Since plugins are running within internal libtorrent threads, one convenient way to communicate with the client is to post custom alerts.

The expected interface of any alert , apart from deriving from the alert base class, looks like this:. It must not collide with any other alert. When defining your own alert , make sure it's greater than this constant. The message virtual function is expected to construct a useful string representation of the alert and the event or data it represents. Something convenient to put in a log file for instance. The static category is required for checking whether or not the category for a specific alert is enabled or not, without instantiating the alert.

The category virtual function is the run-time equivalence. The what virtual function may simply be a string literal of the class name of your alert. For more information, see the alert section. This function is expected to return a bitmask indicating which features this plugin implements. Some callbacks on this object may not be called unless the corresponding feature flag is returned here.

Note that callbacks may still be called even if the corresponding feature is not specified in the return value here. Torrent plugins are associated with a single torrent and have a number of functions called at certain events.

Many of its functions have the ability to change or override the default libtorrent behavior. This function is called each time a new peer is connected to the torrent. Which in turn will have its hook functions called on event specific to that peer. These hooks are called when a piece passes the hash check or fails the hash check, respectively.

The index is the piece index that was downloaded. This hook is called approximately once per second. It is a way of making it easy for plugins to do timed events, for sending messages or whatever. These hooks are called when the torrent is paused and resumed respectively. The return value indicates if the event was handled. A return value of true indicates that it was handled, and no other plugin after this one will have this hook function called, and the standard handler will also not be invoked.

So, returning true effectively overrides the standard behavior of pause or resume. Note that if you call pause or resume on the torrent from your handler it will recurse back into your handler, so in order to invoke the standard handler, you have to keep your own state on whether you want standard behavior or overridden behavior. This function is called when the initial files of the torrent have been checked.

If there are no files to check, this function is called immediately. This function is always called when the torrent is in a state where it can start downloading. This is before the peer is connected to. The source argument refers to the source where we learned about this peer from.

It's a bitmask, because many sources may have told us about the same peer. This function is expected to return the name of the plugin. Note that incoming connections will have been connected by the time the peer plugin is attached to it, and won't have this hook called. Returning false means that the other end doesn't support this extension and will remove it from the list of plugins. If returning true, the message is not processed by any other plugin and if false is returned the next plugin in the chain will receive it to be able to handle it.

This is not called for web seeds. Every time another fragment of the message is received, this function will be called, until finally the whole message has been received. The purpose of this is to allow early disconnects for invalid messages and for reporting progress of receiving large messages. If true is returned, the original request message won't be sent and no other plugin will have this function called. This must be at least as large as the number of bytes passed in and may be larger if there is additional data to be inserted at the head of the send buffer.

The additional data is retrieved from the passed in vector. The vector must be cleared if no additional data is to be inserted. The extension keeps track of the data peers have sent us for failing pieces and once the piece completes and passes the hash check bans the peers that turned out to have sent corrupt data. This is the main building block in making magnet links work. This extension is enabled by default unless explicitly disabled in the session constructor.

This section describes the functions and classes that are used to create torrent files. It is a layered API with low level classes and higher level convenience functions. A torrent is created in 4 steps:. If there are a lot of files and or deep directory hierarchies to traverse, step one can be time consuming. Typically step 3 is by far the most time consuming step, since it requires to read all the bytes from all the files in the torrent.

This class holds state for creating a torrent. The entry that's returned can then be bencoded into a. It must be a multiple of 16 kiB. Typically it doesn't make sense to set this any lower than 4 kiB. The flags arguments specifies options for the torrent creation. This is the size eligible files are aligned to.

The default is -1, which means the piece size of the torrent. This function will generate the. In order to generate the flat file, use the bencode function. It may be useful to add custom entries to the torrent file before bencoding it and saving it to disk. If anything goes wrong during torrent generation, this function will return an empty entry structure. You can test for this condition by querying the type of the entry:. For instance, you cannot generate a torrent with 0 files in it.

Sets the comment for the torrent. The string str should be utf-8 encoded. The comment in a torrent file is optional. Sets the creator of the torrent. This is optional. This sets the SHA-1 hash for the specified piece index.

You are required to set the hash for every piece in the torrent before generating it. If you have the files on disk, you can use the high level convenience function to do this. This sets the sha1 hash for this file.

This hash will end up under the key sha1 associated with this file for multi-file torrents or in the root info dictionary for single-file torrents. This adds a url seed to the torrent. You can have any number of url seeds. For a single file torrent, this should be an HTTP url, pointing to a file with identical content as the file of the torrent.

For a multi-file torrent, it should point to a directory containing a directory with the same name as this torrent, and all the files of the torrent in it. This adds a DHT node to the torrent. This especially useful if you're creating a tracker less torrent. It can be used by clients to bootstrap their DHT node from.

The node is a hostname and a port number where there is a DHT node running. You can have any number of DHT nodes in a torrent. Adds a tracker to the torrent. This is not strictly required, but most torrents use a tracker as their main source of peers. The tier is the fallback priority of the tracker. All trackers with tier 0 are tried first in any order. If all fail, trackers with tier 1 are tried. If all of those fail, trackers with tier 2 are tried, and so on.

This function sets an X. This makes the torrent an SSL torrent. An SSL torrent requires that each peer has a valid certificate signed by this root certificate. For more information, see the section on ssl torrents. The string is not the path to the cert, it's the actual content of the certificate, loaded into a std::string. Sets and queries the private flag of the torrent. Torrents with the private flag set ask clients to not use any other sources than the tracker for peers, and to not advertise itself publicly, apart from the tracker.

This function returns the merkle hash tree, if the torrent was created as a merkle torrent. The tree is created by generate and won't be valid until that function has been called. From that point onwards, the tree will be saved in the resume data. Add similar torrents by info-hash or collections of similar torrents. Similar torrents are expected to share some files with this torrent.

Torrents sharing a collection name with this torrent are also expected to share files with this torrent. A torrent may have more than one collection and more than one similar torrents. For more information, see BEP In case path refers to a directory, files will be added recursively from the directory. If specified, the predicate p is called once for every file and directory that is encountered.

Files for which p returns true are added, and directories for which p returns true are traversed. The path that is passed in to the predicate is the full path of the file or directory. If no predicate is specified, all files are added, and all directories are traversed.

The optional function f is called in between every hash that is set. Returns a string literal representing the file operation that failed. If there were no failure, it returns an empty string. The offset is the byte offset in the file where the range starts, and size is the number of bytes this range is.

Everything necessary to interpret a regular bittorrent storage file structure. This can be used to avoid reallocating the internal file list when the number of files to be added is known up-front.

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