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| -rw-r--r-- | .gitignore | 4 | ||||
| -rw-r--r-- | Cargo.lock | 691 | ||||
| -rw-r--r-- | Cargo.lock.license | 2 | ||||
| -rw-r--r-- | Cargo.toml | 13 | ||||
| l--------- | LICENSE | 1 | ||||
| -rw-r--r-- | LICENSES/CC-BY-SA-4.0.text | 428 | ||||
| -rw-r--r-- | LICENSES/CC0-1.0.text | 121 | ||||
| -rw-r--r-- | LICENSES/GPL-3.0-or-later.md | 675 | ||||
| -rw-r--r-- | README.md | 82 | ||||
| -rw-r--r-- | src/config.rs | 59 | ||||
| -rw-r--r-- | src/main.rs | 174 |
11 files changed, 2250 insertions, 0 deletions
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Therefore, you +have certain responsibilities if you distribute copies of the +software, or if you modify it: responsibilities to respect the freedom +of others. + +For example, if you distribute copies of such a program, whether +gratis or for a fee, you must pass on to the recipients the same +freedoms that you received. You must make sure that they, too, receive +or can get the source code. And you must show them these terms so they +know their rights. + +Developers that use the GNU GPL protect your rights with two steps: +(1) assert copyright on the software, and (2) offer you this License +giving you legal permission to copy, distribute and/or modify it. + +For the developers' and authors' protection, the GPL clearly explains +that there is no warranty for this free software. For both users' and +authors' sake, the GPL requires that modified versions be marked as +changed, so that their problems will not be attributed erroneously to +authors of previous versions. + +Some devices are designed to deny users access to install or run +modified versions of the software inside them, although the +manufacturer can do so. This is fundamentally incompatible with the +aim of protecting users' freedom to change the software. The +systematic pattern of such abuse occurs in the area of products for +individuals to use, which is precisely where it is most unacceptable. +Therefore, we have designed this version of the GPL to prohibit the +practice for those products. If such problems arise substantially in +other domains, we stand ready to extend this provision to those +domains in future versions of the GPL, as needed to protect the +freedom of users. + +Finally, every program is threatened constantly by software patents. +States should not allow patents to restrict development and use of +software on general-purpose computers, but in those that do, we wish +to avoid the special danger that patents applied to a free program +could make it effectively proprietary. To prevent this, the GPL +assures that patents cannot be used to render the program non-free. + +The precise terms and conditions for copying, distribution and +modification follow. + +## TERMS AND CONDITIONS + +### 0. Definitions. + +"This License" refers to version 3 of the GNU General Public License. + +"Copyright" also means copyright-like laws that apply to other kinds +of works, such as semiconductor masks. + +"The Program" refers to any copyrightable work licensed under this +License. Each licensee is addressed as "you". "Licensees" and +"recipients" may be individuals or organizations. + +To "modify" a work means to copy from or adapt all or part of the work +in a fashion requiring copyright permission, other than the making of +an exact copy. The resulting work is called a "modified version" of +the earlier work or a work "based on" the earlier work. + +A "covered work" means either the unmodified Program or a work based +on the Program. + +To "propagate" a work means to do anything with it that, without +permission, would make you directly or secondarily liable for +infringement under applicable copyright law, except executing it on a +computer or modifying a private copy. Propagation includes copying, +distribution (with or without modification), making available to the +public, and in some countries other activities as well. + +To "convey" a work means any kind of propagation that enables other +parties to make or receive copies. Mere interaction with a user +through a computer network, with no transfer of a copy, is not +conveying. + +An interactive user interface displays "Appropriate Legal Notices" to +the extent that it includes a convenient and prominently visible +feature that (1) displays an appropriate copyright notice, and (2) +tells the user that there is no warranty for the work (except to the +extent that warranties are provided), that licensees may convey the +work under this License, and how to view a copy of this License. If +the interface presents a list of user commands or options, such as a +menu, a prominent item in the list meets this criterion. + +### 1. Source Code. + +The "source code" for a work means the preferred form of the work for +making modifications to it. "Object code" means any non-source form of +a work. + +A "Standard Interface" means an interface that either is an official +standard defined by a recognized standards body, or, in the case of +interfaces specified for a particular programming language, one that +is widely used among developers working in that language. + +The "System Libraries" of an executable work include anything, other +than the work as a whole, that (a) is included in the normal form of +packaging a Major Component, but which is not part of that Major +Component, and (b) serves only to enable use of the work with that +Major Component, or to implement a Standard Interface for which an +implementation is available to the public in source code form. A +"Major Component", in this context, means a major essential component +(kernel, window system, and so on) of the specific operating system +(if any) on which the executable work runs, or a compiler used to +produce the work, or an object code interpreter used to run it. + +The "Corresponding Source" for a work in object code form means all +the source code needed to generate, install, and (for an executable +work) run the object code and to modify the work, including scripts to +control those activities. However, it does not include the work's +System Libraries, or general-purpose tools or generally available free +programs which are used unmodified in performing those activities but +which are not part of the work. For example, Corresponding Source +includes interface definition files associated with source files for +the work, and the source code for shared libraries and dynamically +linked subprograms that the work is specifically designed to require, +such as by intimate data communication or control flow between those +subprograms and other parts of the work. + +The Corresponding Source need not include anything that users can +regenerate automatically from other parts of the Corresponding Source. + +The Corresponding Source for a work in source code form is that same +work. + +### 2. Basic Permissions. + +All rights granted under this License are granted for the term of +copyright on the Program, and are irrevocable provided the stated +conditions are met. This License explicitly affirms your unlimited +permission to run the unmodified Program. The output from running a +covered work is covered by this License only if the output, given its +content, constitutes a covered work. This License acknowledges your +rights of fair use or other equivalent, as provided by copyright law. + +You may make, run and propagate covered works that you do not convey, +without conditions so long as your license otherwise remains in force. +You may convey covered works to others for the sole purpose of having +them make modifications exclusively for you, or provide you with +facilities for running those works, provided that you comply with the +terms of this License in conveying all material for which you do not +control copyright. Those thus making or running the covered works for +you must do so exclusively on your behalf, under your direction and +control, on terms that prohibit them from making any copies of your +copyrighted material outside their relationship with you. + +Conveying under any other circumstances is permitted solely under the +conditions stated below. Sublicensing is not allowed; section 10 makes +it unnecessary. + +### 3. Protecting Users' Legal Rights From Anti-Circumvention Law. + +No covered work shall be deemed part of an effective technological +measure under any applicable law fulfilling obligations under article +11 of the WIPO copyright treaty adopted on 20 December 1996, or +similar laws prohibiting or restricting circumvention of such +measures. + +When you convey a covered work, you waive any legal power to forbid +circumvention of technological measures to the extent such +circumvention is effected by exercising rights under this License with +respect to the covered work, and you disclaim any intention to limit +operation or modification of the work as a means of enforcing, against +the work's users, your or third parties' legal rights to forbid +circumvention of technological measures. + +### 4. Conveying Verbatim Copies. + +You may convey verbatim copies of the Program's source code as you +receive it, in any medium, provided that you conspicuously and +appropriately publish on each copy an appropriate copyright notice; +keep intact all notices stating that this License and any +non-permissive terms added in accord with section 7 apply to the code; +keep intact all notices of the absence of any warranty; and give all +recipients a copy of this License along with the Program. + +You may charge any price or no price for each copy that you convey, +and you may offer support or warranty protection for a fee. + +### 5. Conveying Modified Source Versions. + +You may convey a work based on the Program, or the modifications to +produce it from the Program, in the form of source code under the +terms of section 4, provided that you also meet all of these +conditions: + +- a) The work must carry prominent notices stating that you modified + it, and giving a relevant date. +- b) The work must carry prominent notices stating that it is + released under this License and any conditions added under + section 7. This requirement modifies the requirement in section 4 + to "keep intact all notices". +- c) You must license the entire work, as a whole, under this + License to anyone who comes into possession of a copy. This + License will therefore apply, along with any applicable section 7 + additional terms, to the whole of the work, and all its parts, + regardless of how they are packaged. This License gives no + permission to license the work in any other way, but it does not + invalidate such permission if you have separately received it. +- d) If the work has interactive user interfaces, each must display + Appropriate Legal Notices; however, if the Program has interactive + interfaces that do not display Appropriate Legal Notices, your + work need not make them do so. + +A compilation of a covered work with other separate and independent +works, which are not by their nature extensions of the covered work, +and which are not combined with it such as to form a larger program, +in or on a volume of a storage or distribution medium, is called an +"aggregate" if the compilation and its resulting copyright are not +used to limit the access or legal rights of the compilation's users +beyond what the individual works permit. Inclusion of a covered work +in an aggregate does not cause this License to apply to the other +parts of the aggregate. + +### 6. Conveying Non-Source Forms. + +You may convey a covered work in object code form under the terms of +sections 4 and 5, provided that you also convey the machine-readable +Corresponding Source under the terms of this License, in one of these +ways: + +- a) Convey the object code in, or embodied in, a physical product + (including a physical distribution medium), accompanied by the + Corresponding Source fixed on a durable physical medium + customarily used for software interchange. +- b) Convey the object code in, or embodied in, a physical product + (including a physical distribution medium), accompanied by a + written offer, valid for at least three years and valid for as + long as you offer spare parts or customer support for that product + model, to give anyone who possesses the object code either (1) a + copy of the Corresponding Source for all the software in the + product that is covered by this License, on a durable physical + medium customarily used for software interchange, for a price no + more than your reasonable cost of physically performing this + conveying of source, or (2) access to copy the Corresponding + Source from a network server at no charge. +- c) Convey individual copies of the object code with a copy of the + written offer to provide the Corresponding Source. This + alternative is allowed only occasionally and noncommercially, and + only if you received the object code with such an offer, in accord + with subsection 6b. +- d) Convey the object code by offering access from a designated + place (gratis or for a charge), and offer equivalent access to the + Corresponding Source in the same way through the same place at no + further charge. You need not require recipients to copy the + Corresponding Source along with the object code. If the place to + copy the object code is a network server, the Corresponding Source + may be on a different server (operated by you or a third party) + that supports equivalent copying facilities, provided you maintain + clear directions next to the object code saying where to find the + Corresponding Source. Regardless of what server hosts the + Corresponding Source, you remain obligated to ensure that it is + available for as long as needed to satisfy these requirements. +- e) Convey the object code using peer-to-peer transmission, + provided you inform other peers where the object code and + Corresponding Source of the work are being offered to the general + public at no charge under subsection 6d. + +A separable portion of the object code, whose source code is excluded +from the Corresponding Source as a System Library, need not be +included in conveying the object code work. + +A "User Product" is either (1) a "consumer product", which means any +tangible personal property which is normally used for personal, +family, or household purposes, or (2) anything designed or sold for +incorporation into a dwelling. In determining whether a product is a +consumer product, doubtful cases shall be resolved in favor of +coverage. For a particular product received by a particular user, +"normally used" refers to a typical or common use of that class of +product, regardless of the status of the particular user or of the way +in which the particular user actually uses, or expects or is expected +to use, the product. A product is a consumer product regardless of +whether the product has substantial commercial, industrial or +non-consumer uses, unless such uses represent the only significant +mode of use of the product. + +"Installation Information" for a User Product means any methods, +procedures, authorization keys, or other information required to +install and execute modified versions of a covered work in that User +Product from a modified version of its Corresponding Source. The +information must suffice to ensure that the continued functioning of +the modified object code is in no case prevented or interfered with +solely because modification has been made. + +If you convey an object code work under this section in, or with, or +specifically for use in, a User Product, and the conveying occurs as +part of a transaction in which the right of possession and use of the +User Product is transferred to the recipient in perpetuity or for a +fixed term (regardless of how the transaction is characterized), the +Corresponding Source conveyed under this section must be accompanied +by the Installation Information. But this requirement does not apply +if neither you nor any third party retains the ability to install +modified object code on the User Product (for example, the work has +been installed in ROM). + +The requirement to provide Installation Information does not include a +requirement to continue to provide support service, warranty, or +updates for a work that has been modified or installed by the +recipient, or for the User Product in which it has been modified or +installed. Access to a network may be denied when the modification +itself materially and adversely affects the operation of the network +or violates the rules and protocols for communication across the +network. + +Corresponding Source conveyed, and Installation Information provided, +in accord with this section must be in a format that is publicly +documented (and with an implementation available to the public in +source code form), and must require no special password or key for +unpacking, reading or copying. + +### 7. Additional Terms. + +"Additional permissions" are terms that supplement the terms of this +License by making exceptions from one or more of its conditions. +Additional permissions that are applicable to the entire Program shall +be treated as though they were included in this License, to the extent +that they are valid under applicable law. If additional permissions +apply only to part of the Program, that part may be used separately +under those permissions, but the entire Program remains governed by +this License without regard to the additional permissions. + +When you convey a copy of a covered work, you may at your option +remove any additional permissions from that copy, or from any part of +it. (Additional permissions may be written to require their own +removal in certain cases when you modify the work.) You may place +additional permissions on material, added by you to a covered work, +for which you have or can give appropriate copyright permission. + +Notwithstanding any other provision of this License, for material you +add to a covered work, you may (if authorized by the copyright holders +of that material) supplement the terms of this License with terms: + +- a) Disclaiming warranty or limiting liability differently from the + terms of sections 15 and 16 of this License; or +- b) Requiring preservation of specified reasonable legal notices or + author attributions in that material or in the Appropriate Legal + Notices displayed by works containing it; or +- c) Prohibiting misrepresentation of the origin of that material, + or requiring that modified versions of such material be marked in + reasonable ways as different from the original version; or +- d) Limiting the use for publicity purposes of names of licensors + or authors of the material; or +- e) Declining to grant rights under trademark law for use of some + trade names, trademarks, or service marks; or +- f) Requiring indemnification of licensors and authors of that + material by anyone who conveys the material (or modified versions + of it) with contractual assumptions of liability to the recipient, + for any liability that these contractual assumptions directly + impose on those licensors and authors. + +All other non-permissive additional terms are considered "further +restrictions" within the meaning of section 10. If the Program as you +received it, or any part of it, contains a notice stating that it is +governed by this License along with a term that is a further +restriction, you may remove that term. If a license document contains +a further restriction but permits relicensing or conveying under this +License, you may add to a covered work material governed by the terms +of that license document, provided that the further restriction does +not survive such relicensing or conveying. + +If you add terms to a covered work in accord with this section, you +must place, in the relevant source files, a statement of the +additional terms that apply to those files, or a notice indicating +where to find the applicable terms. + +Additional terms, permissive or non-permissive, may be stated in the +form of a separately written license, or stated as exceptions; the +above requirements apply either way. + +### 8. Termination. + +You may not propagate or modify a covered work except as expressly +provided under this License. Any attempt otherwise to propagate or +modify it is void, and will automatically terminate your rights under +this License (including any patent licenses granted under the third +paragraph of section 11). + +However, if you cease all violation of this License, then your license +from a particular copyright holder is reinstated (a) provisionally, +unless and until the copyright holder explicitly and finally +terminates your license, and (b) permanently, if the copyright holder +fails to notify you of the violation by some reasonable means prior to +60 days after the cessation. + +Moreover, your license from a particular copyright holder is +reinstated permanently if the copyright holder notifies you of the +violation by some reasonable means, this is the first time you have +received notice of violation of this License (for any work) from that +copyright holder, and you cure the violation prior to 30 days after +your receipt of the notice. + +Termination of your rights under this section does not terminate the +licenses of parties who have received copies or rights from you under +this License. If your rights have been terminated and not permanently +reinstated, you do not qualify to receive new licenses for the same +material under section 10. + +### 9. Acceptance Not Required for Having Copies. + +You are not required to accept this License in order to receive or run +a copy of the Program. Ancillary propagation of a covered work +occurring solely as a consequence of using peer-to-peer transmission +to receive a copy likewise does not require acceptance. However, +nothing other than this License grants you permission to propagate or +modify any covered work. These actions infringe copyright if you do +not accept this License. Therefore, by modifying or propagating a +covered work, you indicate your acceptance of this License to do so. + +### 10. Automatic Licensing of Downstream Recipients. + +Each time you convey a covered work, the recipient automatically +receives a license from the original licensors, to run, modify and +propagate that work, subject to this License. You are not responsible +for enforcing compliance by third parties with this License. + +An "entity transaction" is a transaction transferring control of an +organization, or substantially all assets of one, or subdividing an +organization, or merging organizations. If propagation of a covered +work results from an entity transaction, each party to that +transaction who receives a copy of the work also receives whatever +licenses to the work the party's predecessor in interest had or could +give under the previous paragraph, plus a right to possession of the +Corresponding Source of the work from the predecessor in interest, if +the predecessor has it or can get it with reasonable efforts. + +You may not impose any further restrictions on the exercise of the +rights granted or affirmed under this License. For example, you may +not impose a license fee, royalty, or other charge for exercise of +rights granted under this License, and you may not initiate litigation +(including a cross-claim or counterclaim in a lawsuit) alleging that +any patent claim is infringed by making, using, selling, offering for +sale, or importing the Program or any portion of it. + +### 11. Patents. + +A "contributor" is a copyright holder who authorizes use under this +License of the Program or a work on which the Program is based. The +work thus licensed is called the contributor's "contributor version". + +A contributor's "essential patent claims" are all patent claims owned +or controlled by the contributor, whether already acquired or +hereafter acquired, that would be infringed by some manner, permitted +by this License, of making, using, or selling its contributor version, +but do not include claims that would be infringed only as a +consequence of further modification of the contributor version. For +purposes of this definition, "control" includes the right to grant +patent sublicenses in a manner consistent with the requirements of +this License. + +Each contributor grants you a non-exclusive, worldwide, royalty-free +patent license under the contributor's essential patent claims, to +make, use, sell, offer for sale, import and otherwise run, modify and +propagate the contents of its contributor version. + +In the following three paragraphs, a "patent license" is any express +agreement or commitment, however denominated, not to enforce a patent +(such as an express permission to practice a patent or covenant not to +sue for patent infringement). To "grant" such a patent license to a +party means to make such an agreement or commitment not to enforce a +patent against the party. + +If you convey a covered work, knowingly relying on a patent license, +and the Corresponding Source of the work is not available for anyone +to copy, free of charge and under the terms of this License, through a +publicly available network server or other readily accessible means, +then you must either (1) cause the Corresponding Source to be so +available, or (2) arrange to deprive yourself of the benefit of the +patent license for this particular work, or (3) arrange, in a manner +consistent with the requirements of this License, to extend the patent +license to downstream recipients. "Knowingly relying" means you have +actual knowledge that, but for the patent license, your conveying the +covered work in a country, or your recipient's use of the covered work +in a country, would infringe one or more identifiable patents in that +country that you have reason to believe are valid. + +If, pursuant to or in connection with a single transaction or +arrangement, you convey, or propagate by procuring conveyance of, a +covered work, and grant a patent license to some of the parties +receiving the covered work authorizing them to use, propagate, modify +or convey a specific copy of the covered work, then the patent license +you grant is automatically extended to all recipients of the covered +work and works based on it. + +A patent license is "discriminatory" if it does not include within the +scope of its coverage, prohibits the exercise of, or is conditioned on +the non-exercise of one or more of the rights that are specifically +granted under this License. You may not convey a covered work if you +are a party to an arrangement with a third party that is in the +business of distributing software, under which you make payment to the +third party based on the extent of your activity of conveying the +work, and under which the third party grants, to any of the parties +who would receive the covered work from you, a discriminatory patent +license (a) in connection with copies of the covered work conveyed by +you (or copies made from those copies), or (b) primarily for and in +connection with specific products or compilations that contain the +covered work, unless you entered into that arrangement, or that patent +license was granted, prior to 28 March 2007. + +Nothing in this License shall be construed as excluding or limiting +any implied license or other defenses to infringement that may +otherwise be available to you under applicable patent law. + +### 12. No Surrender of Others' Freedom. + +If conditions are imposed on you (whether by court order, agreement or +otherwise) that contradict the conditions of this License, they do not +excuse you from the conditions of this License. If you cannot convey a +covered work so as to satisfy simultaneously your obligations under +this License and any other pertinent obligations, then as a +consequence you may not convey it at all. For example, if you agree to +terms that obligate you to collect a royalty for further conveying +from those to whom you convey the Program, the only way you could +satisfy both those terms and this License would be to refrain entirely +from conveying the Program. + +### 13. Use with the GNU Affero General Public License. + +Notwithstanding any other provision of this License, you have +permission to link or combine any covered work with a work licensed +under version 3 of the GNU Affero General Public License into a single +combined work, and to convey the resulting work. The terms of this +License will continue to apply to the part which is the covered work, +but the special requirements of the GNU Affero General Public License, +section 13, concerning interaction through a network will apply to the +combination as such. + +### 14. Revised Versions of this License. + +The Free Software Foundation may publish revised and/or new versions +of the GNU General Public License from time to time. Such new versions +will be similar in spirit to the present version, but may differ in +detail to address new problems or concerns. + +Each version is given a distinguishing version number. If the Program +specifies that a certain numbered version of the GNU General Public +License "or any later version" applies to it, you have the option of +following the terms and conditions either of that numbered version or +of any later version published by the Free Software Foundation. If the +Program does not specify a version number of the GNU General Public +License, you may choose any version ever published by the Free +Software Foundation. + +If the Program specifies that a proxy can decide which future versions +of the GNU General Public License can be used, that proxy's public +statement of acceptance of a version permanently authorizes you to +choose that version for the Program. + +Later license versions may give you additional or different +permissions. However, no additional obligations are imposed on any +author or copyright holder as a result of your choosing to follow a +later version. + +### 15. Disclaimer of Warranty. + +THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY +APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT +HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT +WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT +LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND +PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE +DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR +CORRECTION. + +### 16. Limitation of Liability. + +IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING +WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR +CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, +INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES +ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT +NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR +LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM +TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER +PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. + +### 17. Interpretation of Sections 15 and 16. + +If the disclaimer of warranty and limitation of liability provided +above cannot be given local legal effect according to their terms, +reviewing courts shall apply local law that most closely approximates +an absolute waiver of all civil liability in connection with the +Program, unless a warranty or assumption of liability accompanies a +copy of the Program in return for a fee. + +END OF TERMS AND CONDITIONS + +## How to Apply These Terms to Your New Programs + +If you develop a new program, and you want it to be of the greatest +possible use to the public, the best way to achieve this is to make it +free software which everyone can redistribute and change under these +terms. + +To do so, attach the following notices to the program. It is safest to +attach them to the start of each source file to most effectively state +the exclusion of warranty; and each file should have at least the +"copyright" line and a pointer to where the full notice is found. + + <one line to give the program's name and a brief idea of what it does.> + Copyright (C) <year> <name of author> + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <https://www.gnu.org/licenses/>. + +Also add information on how to contact you by electronic and paper +mail. + +If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + <program> Copyright (C) <year> <name of author> + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands \`show w' and \`show c' should show the +appropriate parts of the General Public License. Of course, your +program's commands might be different; for a GUI interface, you would +use an "about box". + +You should also get your employer (if you work as a programmer) or +school, if any, to sign a "copyright disclaimer" for the program, if +necessary. For more information on this, and how to apply and follow +the GNU GPL, see <https://www.gnu.org/licenses/>. + +The GNU General Public License does not permit incorporating your +program into proprietary programs. If your program is a subroutine +library, you may consider it more useful to permit linking proprietary +applications with the library. If this is what you want to do, use the +GNU Lesser General Public License instead of this License. But first, +please read <https://www.gnu.org/licenses/why-not-lgpl.html>. diff --git a/README.md b/README.md new file mode 100644 index 0000000..c376268 --- /dev/null +++ b/README.md @@ -0,0 +1,82 @@ +<!-- +SPDX-FileCopyrightText: 2025 Tomasz Kramkowski <tomasz@kramkow.ski> +SPDX-License-Identifier: CC-BY-SA-4.0 +--> + +# MQTTR + +MQTTR (named for "MQTT Router") is a MQTT router (duh) which lets you subscribe +to MQTT topics and execute arbitrary programs when a message matching that topic +arrives. + +It is the successor of [MQTTT](https://the-tk.com/cgit/mqttt/about/) which was +the result of realising that using a filesystem hierarchy to represent the +configuration did not appear to have any particular benefits over just storing +the information in the already existing config file. + +## Building and Installation + +Use `cargo build` as normal. + +The `SYSCONFDIR` environment variable controls the location of where `mqttr.toml` is searched. The default is `/usr/local/etc`. + +Once built, the `mqttr` program (found in `target/{debug,release}/mqttr`) should +be located in some sensible place (e.g. `/usr/local/bin/mqttr`) and configured +as a system service. + +`mqttr` does not have a way to double-fork, if you need this behaviour, use +`daemon` or some equivalent utility. + +## Configuration + +Create a `mqttr.toml` in the appropriate location. The file should contain at +minimum a set of routes. The following is the default configuration: + +```toml +host = "localhost" # MQTT server host +port = 1883 # MQTT server port +# [credentials] # Uncomment to specify MQTT connection credentials +# username = "username" +# password = "password" +id = "mqttr" # MQTT client identifier +``` + +The routes follow the following format: + +```toml +[routes] +"zigbee2mqtt/+/light" = [ + ["/path/to/program"], + ["/path/to/another/program", "with", "args"], +] +"foo/bar/baz" = [ ... ] +``` + +On startup, `mqttr` will read the config file and subscribe to all the topics. +When a message is received, `mqttr` will match the message topic against the +routes and execute every program which is part of a matching route. Each program +will have the message topic appended as an additional argument and will receive +the message on stdin. + +An example program is this script: + +```bash +#!/usr/bin/env bash +topic=$1 +action=$(jq --raw-output .action) +[[ $action == "toggle" ]] || exit 0 +mosquitto_pub --topic "zigbee2mqtt/light/set" --message '{"state":"TOGGLE"}' +``` + +This can be bound to a topic such as `zigbee2mqtt/light` which would result in +it being ran every time a new MQTT message is published to this topic. + +## Missing Features + +* Asynchronous program execution +* Timeouts (existent, configurable, per process configurable) +* Permission checks on `mqttr.toml` if it contains a password (to ensure the + password isn't being exposed) +* Configurable QoS for each subscription (default is 0 (at most once)) +* Pass message metadata via the environment (QoS, retain, dup) +* Configurable logging diff --git a/src/config.rs b/src/config.rs new file mode 100644 index 0000000..1190b9a --- /dev/null +++ b/src/config.rs @@ -0,0 +1,59 @@ +// SPDX-FileCopyrightText: 2025 Tomasz Kramkowski <tomasz@kramkow.ski> +// SPDX-License-Identifier: GPL-3.0-or-later + +use std::{collections::HashMap, fs, path::Path, process, time::Duration}; + +use rumqttc::{Client, Connection, MqttOptions}; +use serde::Deserialize; + +use crate::PROGRAM; + +#[derive(Deserialize, Debug)] +pub struct Credentials { + pub username: String, + pub password: String, +} + +fn default_host() -> String { + "localhost".to_string() +} + +fn default_port() -> u16 { + 1883 +} + +fn default_id() -> String { + PROGRAM.to_string() +} + +#[derive(Deserialize, Debug)] +pub struct Config { + #[serde(default = "default_host")] + pub host: String, + #[serde(default = "default_port")] + pub port: u16, + pub credentials: Option<Credentials>, + #[serde(default = "default_id")] + pub id: String, + // TODO: Figure out a way to allow arbitrary unix paths (arbitrary + // non-unicode) without base64 + pub routes: HashMap<String, Vec<Vec<String>>>, +} + +impl Config { + pub fn mqtt_client(&self) -> (Client, Connection) { + let client_id = format!("{}_{}", self.id, process::id()); + let mut options = MqttOptions::new(client_id, &self.host, self.port); + if let Some(credentials) = &self.credentials { + options.set_credentials(&credentials.username, &credentials.password); + } + options.set_keep_alive(Duration::from_secs(5)); + options.set_max_packet_size(10 * 1024 * 1024, 10 * 1024 * 1024); + Client::new(options, 10) + } +} + +pub fn load<P: AsRef<Path>>(path: P) -> anyhow::Result<Config> { + let config = fs::read_to_string(&path)?; + Ok(toml::from_str(&config)?) +} diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..14ccb7a --- /dev/null +++ b/src/main.rs @@ -0,0 +1,174 @@ +// SPDX-FileCopyrightText: 2025 Tomasz Kramkowski <tomasz@kramkow.ski> +// SPDX-License-Identifier: GPL-3.0-or-later + +// TODO: Log levels + +use std::{ + io::Write, + path::PathBuf, + process::{Command, Stdio}, +}; + +use anyhow::Context; +use rumqttc::{Event::Incoming, Packet, Publish, QoS}; + +mod config; + +const PROGRAM: &str = "mqttr"; + +fn run(program: &[String], message: &Publish) -> anyhow::Result<()> { + // TODO: Async + // TODO: Set environment variables + let mut proc = Command::new(&program[0]) + .args(&program[1..]) + .arg(&message.topic) + .stdin(Stdio::piped()) + .spawn()?; + let stdin = proc.stdin.as_mut().context("No stdin")?; + stdin.write_all(&message.payload)?; + println!("{}", proc.wait()?); + Ok(()) +} + +fn topic_match(filter: &str, topic: &str) -> bool { + // TODO: Should probably just be a panic or prevented using types + if filter.is_empty() || topic.is_empty() { + return false; + } + if topic.starts_with('$') && (filter.starts_with('+') || filter.starts_with('#')) { + return false; + } + + // zip_longest would be nice + let mut topic = topic.split('/'); + let mut filter = filter.split('/'); + loop { + let topic_level = topic.next(); + return match filter.next() { + Some("#") => filter.next().is_none(), + Some("+") => { + if topic_level.is_none() { + false + } else { + continue; + } + } + Some(filter_level) => match topic_level { + Some(topic_level) if topic_level == filter_level => { + continue; + } + _ => false, + }, + None => topic_level.is_none(), + }; + } +} + +fn main() -> anyhow::Result<()> { + let mut conf_path: PathBuf = option_env!("SYSCONFDIR").unwrap_or("/usr/local/etc").into(); + conf_path.push(format!("{PROGRAM}.toml")); + let conf = config::load(&conf_path) + .with_context(|| format!("Failed to load config: {:?}", &conf_path))?; + let (client, mut connection) = conf.mqtt_client(); + for topic in conf.routes.keys() { + // TODO: Configurable subscription QoS + if let Err(e) = client.subscribe(topic, QoS::AtMostOnce) { + eprintln!("warning: Failed to subscribe to '{topic}': {e:?}"); + } + } + for notification in connection.iter() { + match notification? { + Incoming(Packet::Publish(p)) => { + for (topic, programs) in conf.routes.iter() { + if topic_match(&topic, &p.topic) { + for program in programs { + if let Err(e) = run(program, &p) { + eprintln!("error: Failed to run {program:?}: {e:?}"); + } + } + } + } + } + _ => (), + } + } + Ok(()) +} + +#[cfg(test)] +mod tests { + use super::topic_match; + + #[test] + fn topic_match_basic() { + assert!(topic_match("foo/bar/baz", "foo/bar/baz")); + assert!(!topic_match("foo/bar/baz", "foo/bar/qux")); + assert!(!topic_match("foo/bar", "foo/bar/baz")); + assert!(!topic_match("foo/bar/baz", "foo/bar")); + } + + #[test] + fn topic_match_wildcard_hash() { + assert!(topic_match("foo/bar/baz/#", "foo/bar/baz")); + assert!(topic_match("foo/bar/baz/#", "foo/bar/baz/qux")); + assert!(topic_match("foo/bar/baz/#", "foo/bar/baz/qux/quux")); + assert!(topic_match("#", "foo/bar/baz")); + assert!(topic_match("#", "foo")); + assert!(topic_match("#", "/")); + assert!(topic_match("#", "/foo")); + assert!(!topic_match("foo/bar/#", "foo/baz/bar")); + assert!(!topic_match("foo/bar/#", "foo")); + } + + #[test] + fn topic_match_wildcard_plus() { + assert!(topic_match("foo/bar/+", "foo/bar/baz")); + assert!(topic_match("foo/bar/+", "foo/bar/qux")); + assert!(!topic_match("foo/bar/+", "foo/bar/baz/qux")); + assert!(topic_match("foo/+", "foo/")); + assert!(!topic_match("foo/+", "foo")); + assert!(topic_match("+", "foo")); + assert!(topic_match("+/bar/#", "foo/bar/baz/qux")); + assert!(topic_match("+/bar/#", "qux/bar")); + assert!(topic_match("foo/+/baz", "foo/bar/baz")); + assert!(topic_match("foo/+/baz", "foo/qux/baz")); + assert!(!topic_match("foo/+/baz", "foo/bar/qux")); + assert!(topic_match("+/+", "/foo")); + assert!(topic_match("/+", "/foo")); + assert!(!topic_match("+", "/foo")); + } + + #[test] + fn topic_match_dollar() { + assert!(!topic_match("#", "$foo/bar")); + assert!(!topic_match("+/bar/baz", "$foo/bar/baz")); + assert!(topic_match("$foo/#", "$foo/bar")); + assert!(topic_match("$foo/#", "$foo/bar/baz")); + assert!(topic_match("$foo/#", "$foo")); + assert!(topic_match("$foo/bar/+", "$foo/bar/baz")); + assert!(!topic_match("$foo/#", "foo/bar")); + } + + #[test] + fn topic_match_edge_cases() { + assert!(!topic_match("foo", "FOO")); + assert!(topic_match("foo bar", "foo bar")); + assert!(!topic_match("foo bar", "foo bar")); + assert!(!topic_match("foo bar", "foo bar")); + assert!(!topic_match("/foo", "foo")); + assert!(!topic_match("foo", "/foo")); + assert!(topic_match("foo//bar", "foo//bar")); + assert!(!topic_match("foo/bar", "foo//bar")); + assert!(!topic_match("foo//bar", "foo/bar")); + assert!(!topic_match("foo//baz", "foo/bar/baz")); + assert!(!topic_match("foo/bar/baz", "foo//baz")); + assert!(topic_match("foo/+/baz", "foo//baz")); + assert!(topic_match("/", "/")); + assert!(!topic_match("/", "foo")); + assert!(!topic_match("foo", "/")); + assert!(!topic_match("", "")); + assert!(!topic_match("+", "")); + assert!(!topic_match("#", "")); + assert!(!topic_match("foo/#/baz", "foo/bar/baz")); + } +} |