diff --git a/libs/minidns/.gitignore b/libs/minidns/.gitignore new file mode 100644 index 00000000..2362cd05 --- /dev/null +++ b/libs/minidns/.gitignore @@ -0,0 +1,107 @@ +# From https://github.com/github/gitignore + +# # # # # # # # # # # # +# Android gitignore # +# # # # # # # # # # # # + +# Built application files +*.apk +*.ap_ + +# Files for the Dalvik VM +*.dex + +# Java class files +*.class + +# Generated files +bin/ +gen/ + +# Gradle files +.gradle/ +build/ + +# Local configuration file (sdk path, etc) +local.properties +gradle.properties + +# Proguard folder generated by Eclipse +proguard/ + +# # # # # # # # +# VIM / Linux # +# # # # # # # # + +[._]*.s[a-w][a-z] +[._]s[a-w][a-z] +*.un~ +Session.vim +.netrwhist +*~ +.directory + +# # # # # # +# Eclipse # +# # # # # # + +*.pydevproject +.metadata +.gradle +bin/ +tmp/ +*.tmp +*.bak +*.swp +*~.nib +local.properties +.settings/ +.loadpath +.classpath +.project + +# External tool builders +.externalToolBuilders/ + +# Locally stored "Eclipse launch configurations" +*.launch + +# CDT-specific +.cproject + +# PDT-specific +.buildpath + +# sbteclipse plugin +.target + +# TeXlipse plugin +.texlipse + +# # # # # +# OS X # +# # # # # + +.DS_Store +.AppleDouble +.LSOverride + +# Icon must ends with two \r. +Icon + + +# Thumbnails +._* + +# Files that might appear on external disk +.Spotlight-V100 +.Trashes + +# Directories potentially created on remote AFP share +.AppleDB +.AppleDesktop +Network Trash Folder +Temporary Items +.apdisk + + diff --git a/libs/minidns/LICENCE b/libs/minidns/LICENCE new file mode 100644 index 00000000..4c2ee7c0 --- /dev/null +++ b/libs/minidns/LICENCE @@ -0,0 +1,4 @@ +This software may be used under the terms of (at your choice) +- LGPL version 2 (or later) (see LICENCE_LGPL2.1 for details) +- Apache Software licence (see LICENCE_APACHE for details) +- WTFPL (see LICENCE_WTFPL for details) diff --git a/libs/minidns/LICENCE_APACHE b/libs/minidns/LICENCE_APACHE new file mode 100644 index 00000000..e454a525 --- /dev/null +++ b/libs/minidns/LICENCE_APACHE @@ -0,0 +1,178 @@ + + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. Definitions. + + "License" shall mean the terms and conditions for use, reproduction, + and distribution as defined by Sections 1 through 9 of this document. + + "Licensor" shall mean the copyright owner or entity authorized by + the copyright owner that is granting the License. + + "Legal Entity" shall mean the union of the acting entity and all + other entities that control, are controlled by, or are under common + control with that entity. For the purposes of this definition, + "control" means (i) the power, direct or indirect, to cause the + direction or management of such entity, whether by contract or + otherwise, or (ii) ownership of fifty percent (50%) or more of the + outstanding shares, or (iii) beneficial ownership of such entity. + + "You" (or "Your") shall mean an individual or Legal Entity + exercising permissions granted by this License. + + "Source" form shall mean the preferred form for making modifications, + including but not limited to software source code, documentation + source, and configuration files. + + "Object" form shall mean any form resulting from mechanical + transformation or translation of a Source form, including but + not limited to compiled object code, generated documentation, + and conversions to other media types. + + "Work" shall mean the work of authorship, whether in Source or + Object form, made available under the License, as indicated by a + copyright notice that is included in or attached to the work + (an example is provided in the Appendix below). + + "Derivative Works" shall mean any work, whether in Source or Object + form, that is based on (or derived from) the Work and for which the + editorial revisions, annotations, elaborations, or other modifications + represent, as a whole, an original work of authorship. For the purposes + of this License, Derivative Works shall not include works that remain + separable from, or merely link (or bind by name) to the interfaces of, + the Work and Derivative Works thereof. + + "Contribution" shall mean any work of authorship, including + the original version of the Work and any modifications or additions + to that Work or Derivative Works thereof, that is intentionally + submitted to Licensor for inclusion in the Work by the copyright owner + or by an individual or Legal Entity authorized to submit on behalf of + the copyright owner. For the purposes of this definition, "submitted" + means any form of electronic, verbal, or written communication sent + to the Licensor or its representatives, including but not limited to + communication on electronic mailing lists, source code control systems, + and issue tracking systems that are managed by, or on behalf of, the + Licensor for the purpose of discussing and improving the Work, but + excluding communication that is conspicuously marked or otherwise + designated in writing by the copyright owner as "Not a Contribution." + + "Contributor" shall mean Licensor and any individual or Legal Entity + on behalf of whom a Contribution has been received by Licensor and + subsequently incorporated within the Work. + + 2. Grant of Copyright License. Subject to the terms and conditions of + this License, each Contributor hereby grants to You a perpetual, + worldwide, non-exclusive, no-charge, royalty-free, irrevocable + copyright license to reproduce, prepare Derivative Works of, + publicly display, publicly perform, sublicense, and distribute the + Work and such Derivative Works in Source or Object form. + + 3. Grant of Patent License. Subject to the terms and conditions of + this License, each Contributor hereby grants to You a perpetual, + worldwide, non-exclusive, no-charge, royalty-free, irrevocable + (except as stated in this section) patent license to make, have made, + use, offer to sell, sell, import, and otherwise transfer the Work, + where such license applies only to those patent claims licensable + by such Contributor that are necessarily infringed by their + Contribution(s) alone or by combination of their Contribution(s) + with the Work to which such Contribution(s) was submitted. If You + institute patent litigation against any entity (including a + cross-claim or counterclaim in a lawsuit) alleging that the Work + or a Contribution incorporated within the Work constitutes direct + or contributory patent infringement, then any patent licenses + granted to You under this License for that Work shall terminate + as of the date such litigation is filed. + + 4. Redistribution. You may reproduce and distribute copies of the + Work or Derivative Works thereof in any medium, with or without + modifications, and in Source or Object form, provided that You + meet the following conditions: + + (a) You must give any other recipients of the Work or + Derivative Works a copy of this License; and + + (b) You must cause any modified files to carry prominent notices + stating that You changed the files; and + + (c) You must retain, in the Source form of any Derivative Works + that You distribute, all copyright, patent, trademark, and + attribution notices from the Source form of the Work, + excluding those notices that do not pertain to any part of + the Derivative Works; and + + (d) If the Work includes a "NOTICE" text file as part of its + distribution, then any Derivative Works that You distribute must + include a readable copy of the attribution notices contained + within such NOTICE file, excluding those notices that do not + pertain to any part of the Derivative Works, in at least one + of the following places: within a NOTICE text file distributed + as part of the Derivative Works; within the Source form or + documentation, if provided along with the Derivative Works; or, + within a display generated by the Derivative Works, if and + wherever such third-party notices normally appear. The contents + of the NOTICE file are for informational purposes only and + do not modify the License. You may add Your own attribution + notices within Derivative Works that You distribute, alongside + or as an addendum to the NOTICE text from the Work, provided + that such additional attribution notices cannot be construed + as modifying the License. + + You may add Your own copyright statement to Your modifications and + may provide additional or different license terms and conditions + for use, reproduction, or distribution of Your modifications, or + for any such Derivative Works as a whole, provided Your use, + reproduction, and distribution of the Work otherwise complies with + the conditions stated in this License. + + 5. Submission of Contributions. Unless You explicitly state otherwise, + any Contribution intentionally submitted for inclusion in the Work + by You to the Licensor shall be under the terms and conditions of + this License, without any additional terms or conditions. + Notwithstanding the above, nothing herein shall supersede or modify + the terms of any separate license agreement you may have executed + with Licensor regarding such Contributions. + + 6. Trademarks. This License does not grant permission to use the trade + names, trademarks, service marks, or product names of the Licensor, + except as required for reasonable and customary use in describing the + origin of the Work and reproducing the content of the NOTICE file. + + 7. Disclaimer of Warranty. Unless required by applicable law or + agreed to in writing, Licensor provides the Work (and each + Contributor provides its Contributions) on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or + implied, including, without limitation, any warranties or conditions + of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A + PARTICULAR PURPOSE. You are solely responsible for determining the + appropriateness of using or redistributing the Work and assume any + risks associated with Your exercise of permissions under this License. + + 8. Limitation of Liability. In no event and under no legal theory, + whether in tort (including negligence), contract, or otherwise, + unless required by applicable law (such as deliberate and grossly + negligent acts) or agreed to in writing, shall any Contributor be + liable to You for damages, including any direct, indirect, special, + incidental, or consequential damages of any character arising as a + result of this License or out of the use or inability to use the + Work (including but not limited to damages for loss of goodwill, + work stoppage, computer failure or malfunction, or any and all + other commercial damages or losses), even if such Contributor + has been advised of the possibility of such damages. + + 9. Accepting Warranty or Additional Liability. While redistributing + the Work or Derivative Works thereof, You may choose to offer, + and charge a fee for, acceptance of support, warranty, indemnity, + or other liability obligations and/or rights consistent with this + License. However, in accepting such obligations, You may act only + on Your own behalf and on Your sole responsibility, not on behalf + of any other Contributor, and only if You agree to indemnify, + defend, and hold each Contributor harmless for any liability + incurred by, or claims asserted against, such Contributor by reason + of your accepting any such warranty or additional liability. + + END OF TERMS AND CONDITIONS + diff --git a/libs/minidns/LICENCE_LGPL2.1 b/libs/minidns/LICENCE_LGPL2.1 new file mode 100644 index 00000000..51a70cae --- /dev/null +++ b/libs/minidns/LICENCE_LGPL2.1 @@ -0,0 +1,503 @@ + GNU LESSER GENERAL PUBLIC LICENSE + Version 2.1, February 1999 + + Copyright (C) 1991, 1999 Free Software Foundation, Inc. + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + +[This is the first released version of the Lesser GPL. It also counts + as the successor of the GNU Library Public License, version 2, hence + the version number 2.1.] + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. By contrast, the GNU General Public +Licenses are intended to guarantee your freedom to share and change +free software--to make sure the software is free for all its users. + + This license, the Lesser General Public License, applies to some +specially designated software packages--typically libraries--of the +Free Software Foundation and other authors who decide to use it. You +can use it too, but we suggest you first think carefully about whether +this license or the ordinary General Public License is the better +strategy to use in any particular case, based on the explanations below. + + When we speak of free software, we are referring to freedom of use, +not price. Our General Public Licenses are designed to make sure that +you have the freedom to distribute copies of free software (and charge +for this service if you wish); that you receive source code or can get +it if you want it; that you can change the software and use pieces of +it in new free programs; and that you are informed that you can do +these things. + + To protect your rights, we need to make restrictions that forbid +distributors to deny you these rights or to ask you to surrender these +rights. These restrictions translate to certain responsibilities for +you if you distribute copies of the library or if you modify it. + + For example, if you distribute copies of the library, whether gratis +or for a fee, you must give the recipients all the rights that we gave +you. You must make sure that they, too, receive or can get the source +code. If you link other code with the library, you must provide +complete object files to the recipients, so that they can relink them +with the library after making changes to the library and recompiling +it. And you must show them these terms so they know their rights. + + We protect your rights with a two-step method: (1) we copyright the +library, and (2) we offer you this license, which gives you legal +permission to copy, distribute and/or modify the library. + + To protect each distributor, we want to make it very clear that +there is no warranty for the free library. Also, if the library is +modified by someone else and passed on, the recipients should know +that what they have is not the original version, so that the original +author's reputation will not be affected by problems that might be +introduced by others. + + Finally, software patents pose a constant threat to the existence of +any free program. We wish to make sure that a company cannot +effectively restrict the users of a free program by obtaining a +restrictive license from a patent holder. Therefore, we insist that +any patent license obtained for a version of the library must be +consistent with the full freedom of use specified in this license. + + Most GNU software, including some libraries, is covered by the +ordinary GNU General Public License. This license, the GNU Lesser +General Public License, applies to certain designated libraries, and +is quite different from the ordinary General Public License. We use +this license for certain libraries in order to permit linking those +libraries into non-free programs. + + When a program is linked with a library, whether statically or using +a shared library, the combination of the two is legally speaking a +combined work, a derivative of the original library. The ordinary +General Public License therefore permits such linking only if the +entire combination fits its criteria of freedom. The Lesser General +Public License permits more lax criteria for linking other code with +the library. + + We call this license the "Lesser" General Public License because it +does Less to protect the user's freedom than the ordinary General +Public License. It also provides other free software developers Less +of an advantage over competing non-free programs. These disadvantages +are the reason we use the ordinary General Public License for many +libraries. However, the Lesser license provides advantages in certain +special circumstances. + + For example, on rare occasions, there may be a special need to +encourage the widest possible use of a certain library, so that it becomes +a de-facto standard. To achieve this, non-free programs must be +allowed to use the library. A more frequent case is that a free +library does the same job as widely used non-free libraries. In this +case, there is little to gain by limiting the free library to free +software only, so we use the Lesser General Public License. + + In other cases, permission to use a particular library in non-free +programs enables a greater number of people to use a large body of +free software. For example, permission to use the GNU C Library in +non-free programs enables many more people to use the whole GNU +operating system, as well as its variant, the GNU/Linux operating +system. + + Although the Lesser General Public License is Less protective of the +users' freedom, it does ensure that the user of a program that is +linked with the Library has the freedom and the wherewithal to run +that program using a modified version of the Library. + + The precise terms and conditions for copying, distribution and +modification follow. Pay close attention to the difference between a +"work based on the library" and a "work that uses the library". The +former contains code derived from the library, whereas the latter must +be combined with the library in order to run. + + GNU LESSER GENERAL PUBLIC LICENSE + TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION + + 0. This License Agreement applies to any software library or other +program which contains a notice placed by the copyright holder or +other authorized party saying it may be distributed under the terms of +this Lesser General Public License (also called "this License"). +Each licensee is addressed as "you". + + A "library" means a collection of software functions and/or data +prepared so as to be conveniently linked with application programs +(which use some of those functions and data) to form executables. + + The "Library", below, refers to any such software library or work +which has been distributed under these terms. A "work based on the +Library" means either the Library or any derivative work under +copyright law: that is to say, a work containing the Library or a +portion of it, either verbatim or with modifications and/or translated +straightforwardly into another language. (Hereinafter, translation is +included without limitation in the term "modification".) + + "Source code" for a work means the preferred form of the work for +making modifications to it. For a library, complete source code means +all the source code for all modules it contains, plus any associated +interface definition files, plus the scripts used to control compilation +and installation of the library. + + Activities other than copying, distribution and modification are not +covered by this License; they are outside its scope. The act of +running a program using the Library is not restricted, and output from +such a program is covered only if its contents constitute a work based +on the Library (independent of the use of the Library in a tool for +writing it). Whether that is true depends on what the Library does +and what the program that uses the Library does. + + 1. You may copy and distribute verbatim copies of the Library's +complete source code as you receive it, in any medium, provided that +you conspicuously and appropriately publish on each copy an +appropriate copyright notice and disclaimer of warranty; keep intact +all the notices that refer to this License and to the absence of any +warranty; and distribute a copy of this License along with the +Library. + + You may charge a fee for the physical act of transferring a copy, +and you may at your option offer warranty protection in exchange for a +fee. + + 2. You may modify your copy or copies of the Library or any portion +of it, thus forming a work based on the Library, and copy and +distribute such modifications or work under the terms of Section 1 +above, provided that you also meet all of these conditions: + + a) The modified work must itself be a software library. + + b) You must cause the files modified to carry prominent notices + stating that you changed the files and the date of any change. + + c) You must cause the whole of the work to be licensed at no + charge to all third parties under the terms of this License. + + d) If a facility in the modified Library refers to a function or a + table of data to be supplied by an application program that uses + the facility, other than as an argument passed when the facility + is invoked, then you must make a good faith effort to ensure that, + in the event an application does not supply such function or + table, the facility still operates, and performs whatever part of + its purpose remains meaningful. + + (For example, a function in a library to compute square roots has + a purpose that is entirely well-defined independent of the + application. Therefore, Subsection 2d requires that any + application-supplied function or table used by this function must + be optional: if the application does not supply it, the square + root function must still compute square roots.) + +These requirements apply to the modified work as a whole. If +identifiable sections of that work are not derived from the Library, +and can be reasonably considered independent and separate works in +themselves, then this License, and its terms, do not apply to those +sections when you distribute them as separate works. But when you +distribute the same sections as part of a whole which is a work based +on the Library, the distribution of the whole must be on the terms of +this License, whose permissions for other licensees extend to the +entire whole, and thus to each and every part regardless of who wrote +it. + +Thus, it is not the intent of this section to claim rights or contest +your rights to work written entirely by you; rather, the intent is to +exercise the right to control the distribution of derivative or +collective works based on the Library. + +In addition, mere aggregation of another work not based on the Library +with the Library (or with a work based on the Library) on a volume of +a storage or distribution medium does not bring the other work under +the scope of this License. + + 3. You may opt to apply the terms of the ordinary GNU General Public +License instead of this License to a given copy of the Library. To do +this, you must alter all the notices that refer to this License, so +that they refer to the ordinary GNU General Public License, version 2, +instead of to this License. (If a newer version than version 2 of the +ordinary GNU General Public License has appeared, then you can specify +that version instead if you wish.) Do not make any other change in +these notices. + + Once this change is made in a given copy, it is irreversible for +that copy, so the ordinary GNU General Public License applies to all +subsequent copies and derivative works made from that copy. + + This option is useful when you wish to copy part of the code of +the Library into a program that is not a library. + + 4. You may copy and distribute the Library (or a portion or +derivative of it, under Section 2) in object code or executable form +under the terms of Sections 1 and 2 above provided that you accompany +it with the complete corresponding machine-readable source code, which +must be distributed under the terms of Sections 1 and 2 above on a +medium customarily used for software interchange. + + If distribution of object code is made by offering access to copy +from a designated place, then offering equivalent access to copy the +source code from the same place satisfies the requirement to +distribute the source code, even though third parties are not +compelled to copy the source along with the object code. + + 5. A program that contains no derivative of any portion of the +Library, but is designed to work with the Library by being compiled or +linked with it, is called a "work that uses the Library". Such a +work, in isolation, is not a derivative work of the Library, and +therefore falls outside the scope of this License. + + However, linking a "work that uses the Library" with the Library +creates an executable that is a derivative of the Library (because it +contains portions of the Library), rather than a "work that uses the +library". The executable is therefore covered by this License. +Section 6 states terms for distribution of such executables. + + When a "work that uses the Library" uses material from a header file +that is part of the Library, the object code for the work may be a +derivative work of the Library even though the source code is not. +Whether this is true is especially significant if the work can be +linked without the Library, or if the work is itself a library. The +threshold for this to be true is not precisely defined by law. + + If such an object file uses only numerical parameters, data +structure layouts and accessors, and small macros and small inline +functions (ten lines or less in length), then the use of the object +file is unrestricted, regardless of whether it is legally a derivative +work. (Executables containing this object code plus portions of the +Library will still fall under Section 6.) + + Otherwise, if the work is a derivative of the Library, you may +distribute the object code for the work under the terms of Section 6. +Any executables containing that work also fall under Section 6, +whether or not they are linked directly with the Library itself. + + 6. As an exception to the Sections above, you may also combine or +link a "work that uses the Library" with the Library to produce a +work containing portions of the Library, and distribute that work +under terms of your choice, provided that the terms permit +modification of the work for the customer's own use and reverse +engineering for debugging such modifications. + + You must give prominent notice with each copy of the work that the +Library is used in it and that the Library and its use are covered by +this License. You must supply a copy of this License. If the work +during execution displays copyright notices, you must include the +copyright notice for the Library among them, as well as a reference +directing the user to the copy of this License. Also, you must do one +of these things: + + a) Accompany the work with the complete corresponding + machine-readable source code for the Library including whatever + changes were used in the work (which must be distributed under + Sections 1 and 2 above); and, if the work is an executable linked + with the Library, with the complete machine-readable "work that + uses the Library", as object code and/or source code, so that the + user can modify the Library and then relink to produce a modified + executable containing the modified Library. (It is understood + that the user who changes the contents of definitions files in the + Library will not necessarily be able to recompile the application + to use the modified definitions.) + + b) Use a suitable shared library mechanism for linking with the + Library. A suitable mechanism is one that (1) uses at run time a + copy of the library already present on the user's computer system, + rather than copying library functions into the executable, and (2) + will operate properly with a modified version of the library, if + the user installs one, as long as the modified version is + interface-compatible with the version that the work was made with. + + c) Accompany the work with a written offer, valid for at + least three years, to give the same user the materials + specified in Subsection 6a, above, for a charge no more + than the cost of performing this distribution. + + d) If distribution of the work is made by offering access to copy + from a designated place, offer equivalent access to copy the above + specified materials from the same place. + + e) Verify that the user has already received a copy of these + materials or that you have already sent this user a copy. + + For an executable, the required form of the "work that uses the +Library" must include any data and utility programs needed for +reproducing the executable from it. However, as a special exception, +the materials to be distributed need not include anything that is +normally distributed (in either source or binary form) with the major +components (compiler, kernel, and so on) of the operating system on +which the executable runs, unless that component itself accompanies +the executable. + + It may happen that this requirement contradicts the license +restrictions of other proprietary libraries that do not normally +accompany the operating system. Such a contradiction means you cannot +use both them and the Library together in an executable that you +distribute. + + 7. You may place library facilities that are a work based on the +Library side-by-side in a single library together with other library +facilities not covered by this License, and distribute such a combined +library, provided that the separate distribution of the work based on +the Library and of the other library facilities is otherwise +permitted, and provided that you do these two things: + + a) Accompany the combined library with a copy of the same work + based on the Library, uncombined with any other library + facilities. This must be distributed under the terms of the + Sections above. + + b) Give prominent notice with the combined library of the fact + that part of it is a work based on the Library, and explaining + where to find the accompanying uncombined form of the same work. + + 8. You may not copy, modify, sublicense, link with, or distribute +the Library except as expressly provided under this License. Any +attempt otherwise to copy, modify, sublicense, link with, or +distribute the Library is void, and will automatically terminate your +rights under this License. However, parties who have received copies, +or rights, from you under this License will not have their licenses +terminated so long as such parties remain in full compliance. + + 9. You are not required to accept this License, since you have not +signed it. However, nothing else grants you permission to modify or +distribute the Library or its derivative works. These actions are +prohibited by law if you do not accept this License. Therefore, by +modifying or distributing the Library (or any work based on the +Library), you indicate your acceptance of this License to do so, and +all its terms and conditions for copying, distributing or modifying +the Library or works based on it. + + 10. Each time you redistribute the Library (or any work based on the +Library), the recipient automatically receives a license from the +original licensor to copy, distribute, link with or modify the Library +subject to these terms and conditions. You may not impose any further +restrictions on the recipients' exercise of the rights granted herein. +You are not responsible for enforcing compliance by third parties with +this License. + + 11. If, as a consequence of a court judgment or allegation of patent +infringement or for any other reason (not limited to patent issues), +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 +distribute so as to satisfy simultaneously your obligations under this +License and any other pertinent obligations, then as a consequence you +may not distribute the Library at all. For example, if a patent +license would not permit royalty-free redistribution of the Library by +all those who receive copies directly or indirectly through you, then +the only way you could satisfy both it and this License would be to +refrain entirely from distribution of the Library. + +If any portion of this section is held invalid or unenforceable under any +particular circumstance, the balance of the section is intended to apply, +and the section as a whole is intended to apply in other circumstances. + +It is not the purpose of this section to induce you to infringe any +patents or other property right claims or to contest validity of any +such claims; this section has the sole purpose of protecting the +integrity of the free software distribution system which is +implemented by public license practices. Many people have made +generous contributions to the wide range of software distributed +through that system in reliance on consistent application of that +system; it is up to the author/donor to decide if he or she is willing +to distribute software through any other system and a licensee cannot +impose that choice. + +This section is intended to make thoroughly clear what is believed to +be a consequence of the rest of this License. + + 12. If the distribution and/or use of the Library is restricted in +certain countries either by patents or by copyrighted interfaces, the +original copyright holder who places the Library under this License may add +an explicit geographical distribution limitation excluding those countries, +so that distribution is permitted only in or among countries not thus +excluded. In such case, this License incorporates the limitation as if +written in the body of this License. + + 13. The Free Software Foundation may publish revised and/or new +versions of the Lesser 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 Library +specifies a version number of this License which applies to it and +"any later version", you have the option of following the terms and +conditions either of that version or of any later version published by +the Free Software Foundation. If the Library does not specify a +license version number, you may choose any version ever published by +the Free Software Foundation. + + 14. If you wish to incorporate parts of the Library into other free +programs whose distribution conditions are incompatible with these, +write to the author to ask for permission. For software which is +copyrighted by the Free Software Foundation, write to the Free +Software Foundation; we sometimes make exceptions for this. Our +decision will be guided by the two goals of preserving the free status +of all derivatives of our free software and of promoting the sharing +and reuse of software generally. + + NO WARRANTY + + 15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO +WARRANTY FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW. +EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR +OTHER PARTIES PROVIDE THE LIBRARY "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 +LIBRARY IS WITH YOU. SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME +THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. + + 16. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN +WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY +AND/OR REDISTRIBUTE THE LIBRARY 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 +LIBRARY (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 LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF +SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH +DAMAGES. + + END OF TERMS AND CONDITIONS + + How to Apply These Terms to Your New Libraries + + If you develop a new library, and you want it to be of the greatest +possible use to the public, we recommend making it free software that +everyone can redistribute and change. You can do so by permitting +redistribution under these terms (or, alternatively, under the terms of the +ordinary General Public License). + + To apply these terms, attach the following notices to the library. It is +safest to attach them to the start of each source file to most effectively +convey the exclusion of warranty; and each file should have at least the +"copyright" line and a pointer to where the full notice is found. + + + Copyright (C) + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + This library 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with this library; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + +Also add information on how to contact you by electronic and paper mail. + +You should also get your employer (if you work as a programmer) or your +school, if any, to sign a "copyright disclaimer" for the library, if +necessary. Here is a sample; alter the names: + + Yoyodyne, Inc., hereby disclaims all copyright interest in the + library `Frob' (a library for tweaking knobs) written by James Random Hacker. + + , 1 April 1990 + Ty Coon, President of Vice + +That's all there is to it! + diff --git a/libs/minidns/LICENCE_WTFPL b/libs/minidns/LICENCE_WTFPL new file mode 100644 index 00000000..652d3783 --- /dev/null +++ b/libs/minidns/LICENCE_WTFPL @@ -0,0 +1,13 @@ + DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE + Version 2, December 2004 + + Copyright (C) 2014 Rene Treffer + + Everyone is permitted to copy and distribute verbatim or modified + copies of this license document, and changing it is allowed as long + as the name is changed. + + DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE + TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION + + 0. You just DO WHAT THE FUCK YOU WANT TO. diff --git a/libs/minidns/README.md b/libs/minidns/README.md new file mode 100644 index 00000000..3c1417a1 --- /dev/null +++ b/libs/minidns/README.md @@ -0,0 +1,8 @@ +MiniDNS +------- + +MiniDNS is a minimal dns client library for android. It can parse a basic set +of resource records (A, AAAA, NS, SRV) and is easy to use and extend. + +This library is not intended to be used as a DNS server. You might want to +look into dnsjava for such functionality. diff --git a/libs/minidns/build.gradle b/libs/minidns/build.gradle new file mode 100644 index 00000000..5941beaf --- /dev/null +++ b/libs/minidns/build.gradle @@ -0,0 +1,77 @@ +apply plugin: 'java' +apply plugin: 'eclipse' +apply plugin: 'osgi' +apply plugin: 'nexus' + +buildscript { + repositories { + jcenter() + mavenLocal() + mavenCentral() + } + + dependencies { + classpath 'org.gradle.api.plugins:gradle-nexus-plugin:0.7.1' + } +} + +group = 'de.measite.minidns' +description = "A minimal DNS client library with support for A, AAAA, NS and SRV records" +sourceCompatibility = 1.7 +version = 'git tag --points-at HEAD'.execute().text.trim() +isSNAPSHOT = 'git rev-parse --abbrev-ref HEAD'.execute().text.trim() == 'master' + +if (isSNAPSHOT) { + version = version + '-SNAPSHOT' +} + +repositories { + mavenLocal() + mavenCentral() +} + +nexus { + attachSources = true + attachTests = false + attachJavadoc = true + sign = true +} + +modifyPom { + project { + name 'minidns' + description 'Minimal DNS library for java and android systems' + url 'https://github.com/rtreffer/minidns' + inceptionYear '2014' + + scm { + url 'https://github.com/rtreffer/minidns' + connection 'scm:https://github.com/rtreffer/minidns' + developerConnection 'scm:git://github.com/rtreffer/minidns.git' + } + + licenses { + license { + name 'The Apache Software License, Version 2.0' + url 'http://www.apache.org/licenses/LICENSE-2.0.txt' + distribution 'repo' + } + } + + developers { + developer { + id 'rtreffer' + name 'Rene Treffer' + email 'treffer@measite.de' + } + developer { + id 'flow' + name 'Florian Schmaus' + email 'flow@geekplace.eu' + } + } + } +} + +dependencies { +} \ No newline at end of file diff --git a/libs/minidns/gradle.properties.example b/libs/minidns/gradle.properties.example new file mode 100644 index 00000000..68ffc418 --- /dev/null +++ b/libs/minidns/gradle.properties.example @@ -0,0 +1,21 @@ +# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # +# +# GPG settings +# + +# gpg key id +#signing.keyId=DEADBEEF +# the gpg key passphrase +#signing.password=correcthorsebatterystaple +# gpg keyring (this is the default gnupg keyring containing private keys) +#signing.secretKeyRingFile=/home/ubuntu/.gnupg/secring.gpg + +# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # +# +# nexus settings +# + +# the nexus username used for log in +#nexusUsername=ubuntu +# the nexus password +#nexusPassword=correcthorsebatterystaple diff --git a/libs/minidns/src/main/java/de/measite/minidns/Client.java b/libs/minidns/src/main/java/de/measite/minidns/Client.java new file mode 100644 index 00000000..827aa772 --- /dev/null +++ b/libs/minidns/src/main/java/de/measite/minidns/Client.java @@ -0,0 +1,323 @@ +package de.measite.minidns; + +import java.io.IOException; +import java.io.InputStream; +import java.io.InputStreamReader; +import java.io.LineNumberReader; +import java.lang.reflect.Method; +import java.net.DatagramPacket; +import java.net.DatagramSocket; +import java.net.InetAddress; +import java.security.NoSuchAlgorithmException; +import java.security.SecureRandom; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.HashSet; +import java.util.Random; +import java.util.logging.Level; +import java.util.logging.Logger; + +import de.measite.minidns.Record.CLASS; +import de.measite.minidns.Record.TYPE; + +/** + * A minimal DNS client for SRV/A/AAAA/NS and CNAME lookups, with IDN support. + * This circumvents the missing javax.naming package on android. + */ +public class Client { + + private static final Logger LOGGER = Logger.getLogger(Client.class.getName()); + + /** + * The internal random class for sequence generation. + */ + protected Random random; + + /** + * The buffer size for dns replies. + */ + protected int bufferSize = 1500; + + /** + * DNS timeout. + */ + protected int timeout = 5000; + + /** + * The internal DNS cache. + */ + protected DNSCache cache; + + /** + * Create a new DNS client with the given DNS cache. + * @param cache The backend DNS cache. + */ + public Client(DNSCache cache) { + try { + random = SecureRandom.getInstance("SHA1PRNG"); + } catch (NoSuchAlgorithmException e1) { + random = new SecureRandom(); + } + this.cache = cache; + } + + /** + * Create a new DNS client. + */ + public Client() { + this(null); + } + + /** + * Query a nameserver for a single entry. + * @param name The DNS name to request. + * @param type The DNS type to request (SRV, A, AAAA, ...). + * @param clazz The class of the request (usually IN for Internet). + * @param host The DNS server host. + * @param port The DNS server port. + * @return The response (or null on timeout / failure). + * @throws IOException On IO Errors. + */ + public DNSMessage query(String name, TYPE type, CLASS clazz, String host, int port) + throws IOException + { + Question q = new Question(name, type, clazz); + return query(q, host, port); + } + + /** + * Query a nameserver for a single entry. + * @param name The DNS name to request. + * @param type The DNS type to request (SRV, A, AAAA, ...). + * @param clazz The class of the request (usually IN for Internet). + * @param host The DNS server host. + * @return The response (or null on timeout / failure). + * @throws IOException On IO Errors. + */ + public DNSMessage query(String name, TYPE type, CLASS clazz, String host) + throws IOException + { + Question q = new Question(name, type, clazz); + return query(q, host); + } + + /** + * Query the system nameserver for a single entry. + * @param name The DNS name to request. + * @param type The DNS type to request (SRV, A, AAAA, ...). + * @param clazz The class of the request (usually IN for Internet). + * @return The response (or null on timeout/error). + * @return The DNSMessage reply or null. + */ + public DNSMessage query(String name, TYPE type, CLASS clazz) + { + Question q = new Question(name, type, clazz); + return query(q); + } + + /** + * Query a specific server for one entry. + * @param q The question section of the DNS query. + * @param host The dns server host. + * @return The response (or null on timeout/error). + * @throws IOException On IOErrors. + */ + public DNSMessage query(Question q, String host) throws IOException { + return query(q, host, 53); + } + + /** + * Query a specific server for one entry. + * @param q The question section of the DNS query. + * @param host The dns server host. + * @param port the dns port. + * @return The response (or null on timeout/error). + * @throws IOException On IOErrors. + */ + public DNSMessage query(Question q, String host, int port) throws IOException { + DNSMessage dnsMessage = (cache == null) ? null : cache.get(q); + if (dnsMessage != null) { + return dnsMessage; + } + DNSMessage message = new DNSMessage(); + message.setQuestions(new Question[]{q}); + message.setRecursionDesired(true); + message.setId(random.nextInt()); + byte[] buf = message.toArray(); + try (DatagramSocket socket = new DatagramSocket()) { + DatagramPacket packet = new DatagramPacket(buf, buf.length, + InetAddress.getByName(host), port); + socket.setSoTimeout(timeout); + socket.send(packet); + packet = new DatagramPacket(new byte[bufferSize], bufferSize); + socket.receive(packet); + dnsMessage = DNSMessage.parse(packet.getData()); + if (dnsMessage.getId() != message.getId()) { + return null; + } + for (Record record : dnsMessage.getAnswers()) { + if (record.isAnswer(q)) { + if (cache != null) { + cache.put(q, dnsMessage); + } + break; + } + } + return dnsMessage; + } + } + + /** + * Query the system DNS server for one entry. + * @param q The question section of the DNS query. + * @return The response (or null on timeout/error). + */ + public DNSMessage query(Question q) { + // While this query method does in fact re-use query(Question, String) + // we still do a cache lookup here in order to avoid unnecessary + // findDNS()calls, which are expensive on Android. Note that we do not + // put the results back into the Cache, as this is already done by + // query(Question, String). + DNSMessage message = cache.get(q); + if (message != null) { + return message; + } + String dnsServer[] = findDNS(); + for (String dns : dnsServer) { + try { + message = query(q, dns); + if (message == null) { + continue; + } + if (message.getResponseCode() != + DNSMessage.RESPONSE_CODE.NO_ERROR) { + continue; + } + for (Record record: message.getAnswers()) { + if (record.isAnswer(q)) { + return message; + } + } + } catch (IOException ioe) { + LOGGER.log(Level.FINE, "IOException in query", ioe); + } + } + return null; + } + + /** + * Retrieve a list of currently configured DNS servers. + * @return The server array. + */ + public String[] findDNS() { + String[] result = findDNSByReflection(); + if (result != null) { + LOGGER.fine("Got DNS servers via reflection: " + Arrays.toString(result)); + return result; + } + + result = findDNSByExec(); + if (result != null) { + LOGGER.fine("Got DNS servers via exec: " + Arrays.toString(result)); + return result; + } + + // fallback for ipv4 and ipv6 connectivity + // see https://developers.google.com/speed/public-dns/docs/using + LOGGER.fine("No DNS found? Using fallback [8.8.8.8, [2001:4860:4860::8888]]"); + + return new String[]{"8.8.8.8", "[2001:4860:4860::8888]"}; + } + + /** + * Try to retrieve the list of dns server by executing getprop. + * @return Array of servers, or null on failure. + */ + protected String[] findDNSByExec() { + try { + Process process = Runtime.getRuntime().exec("getprop"); + InputStream inputStream = process.getInputStream(); + LineNumberReader lnr = new LineNumberReader( + new InputStreamReader(inputStream)); + String line = null; + HashSet server = new HashSet(6); + while ((line = lnr.readLine()) != null) { + int split = line.indexOf("]: ["); + if (split == -1) { + continue; + } + String property = line.substring(1, split); + String value = line.substring(split + 4, line.length() - 1); + if (property.endsWith(".dns") || property.endsWith(".dns1") || + property.endsWith(".dns2") || property.endsWith(".dns3") || + property.endsWith(".dns4")) { + + // normalize the address + + InetAddress ip = InetAddress.getByName(value); + + if (ip == null) continue; + + value = ip.getHostAddress(); + + if (value == null) continue; + if (value.length() == 0) continue; + + server.add(value); + } + } + if (server.size() > 0) { + return server.toArray(new String[server.size()]); + } + } catch (IOException e) { + LOGGER.log(Level.WARNING, "Exception in findDNSByExec", e); + } + return null; + } + + /** + * Try to retrieve the list of dns server by calling SystemProperties. + * @return Array of servers, or null on failure. + */ + protected String[] findDNSByReflection() { + try { + Class SystemProperties = + Class.forName("android.os.SystemProperties"); + Method method = SystemProperties.getMethod("get", + new Class[] { String.class }); + + ArrayList servers = new ArrayList(5); + + for (String propKey : new String[] { + "net.dns1", "net.dns2", "net.dns3", "net.dns4"}) { + + String value = (String)method.invoke(null, propKey); + + if (value == null) continue; + if (value.length() == 0) continue; + if (servers.contains(value)) continue; + + InetAddress ip = InetAddress.getByName(value); + + if (ip == null) continue; + + value = ip.getHostAddress(); + + if (value == null) continue; + if (value.length() == 0) continue; + if (servers.contains(value)) continue; + + servers.add(value); + } + + if (servers.size() > 0) { + return servers.toArray(new String[servers.size()]); + } + } catch (Exception e) { + // we might trigger some problems this way + LOGGER.log(Level.WARNING, "Exception in findDNSByReflection", e); + } + return null; + } + +} diff --git a/libs/minidns/src/main/java/de/measite/minidns/DNSCache.java b/libs/minidns/src/main/java/de/measite/minidns/DNSCache.java new file mode 100644 index 00000000..14a3a776 --- /dev/null +++ b/libs/minidns/src/main/java/de/measite/minidns/DNSCache.java @@ -0,0 +1,23 @@ +package de.measite.minidns; + +/** + * Cache for DNS Entries. Implementations must be thread safe. + */ +public interface DNSCache { + + /** + * Add an an dns answer/response for a given dns question. Implementations + * should honor the ttl / receive timestamp. + * @param q The question. + * @param message The dns message. + */ + void put(Question q, DNSMessage message); + + /** + * Request a cached dns response. + * @param q The dns question. + * @return The dns message. + */ + DNSMessage get(Question q); + +} diff --git a/libs/minidns/src/main/java/de/measite/minidns/DNSMessage.java b/libs/minidns/src/main/java/de/measite/minidns/DNSMessage.java new file mode 100644 index 00000000..ab2535ce --- /dev/null +++ b/libs/minidns/src/main/java/de/measite/minidns/DNSMessage.java @@ -0,0 +1,524 @@ +package de.measite.minidns; + +import java.io.ByteArrayInputStream; +import java.io.ByteArrayOutputStream; +import java.io.DataInputStream; +import java.io.DataOutputStream; +import java.io.IOException; +import java.util.Arrays; + +/** + * A DNS message as defined by rfc1035. The message consists of a header and + * 4 sections: question, answer, nameserver and addition resource record + * section. + * A message can either be parsed ({@link DNSMessage#parse(byte[])}) or serialized + * ({@link DNSMessage#toArray()}). + */ +public class DNSMessage { + + /** + * Possible DNS reply codes. + */ + public static enum RESPONSE_CODE { + NO_ERROR(0), FORMAT_ERR(1), SERVER_FAIL(2), NX_DOMAIN(3), + NO_IMP(4), REFUSED(5), YXDOMAIN(6), YXRRSET(7), + NXRRSET(8), NOT_AUTH(9),NOT_ZONE(10); + + /** + * Reverse lookup table for response codes. + */ + private final static RESPONSE_CODE INVERSE_LUT[] = new RESPONSE_CODE[]{ + NO_ERROR, FORMAT_ERR, SERVER_FAIL, NX_DOMAIN, NO_IMP, + REFUSED, YXDOMAIN, YXRRSET, NXRRSET, NOT_AUTH, NOT_ZONE, + null, null, null, null, null + }; + + /** + * The response code value. + */ + private final byte value; + + /** + * Create a new response code. + * @param value The response code value. + */ + private RESPONSE_CODE(int value) { + this.value = (byte)value; + } + + /** + * Retrieve the byte value of the response code. + * @return the response code. + */ + public byte getValue() { + return (byte) value; + } + + /** + * Retrieve the response code for a byte value. + * @param value The byte value. + * @return The symbolic response code or null. + * @throws IllegalArgumentException if the value is not in the range of + * 0..15. + */ + public static RESPONSE_CODE getResponseCode(int value) { + if (value < 0 || value > 15) { + throw new IllegalArgumentException(); + } + return INVERSE_LUT[value]; + } + + }; + + /** + * Symbolic DNS Opcode values. + */ + public static enum OPCODE { + QUERY(0), + INVERSE_QUERY(1), + STATUS(2), + NOTIFY(4), + UPDATE(5); + + /** + * Lookup table for for obcode reolution. + */ + private final static OPCODE INVERSE_LUT[] = new OPCODE[]{ + QUERY, INVERSE_QUERY, STATUS, null, NOTIFY, UPDATE, null, + null, null, null, null, null, null, null, null + }; + + /** + * The value of this opcode. + */ + private final byte value; + + /** + * Create a new opcode for a given byte value. + * @param value The byte value of the opcode. + */ + private OPCODE(int value) { + this.value = (byte)value; + } + + /** + * Retrieve the byte value of this opcode. + * @return The byte value of this opcode. + */ + public byte getValue() { + return value; + } + + /** + * Retrieve the symbolic name of an opcode byte. + * @param value The byte value of the opcode. + * @return The symbolic opcode or null. + * @throws IllegalArgumentException If the byte value is not in the + * range 0..15. + */ + public static OPCODE getOpcode(int value) { + if (value < 0 || value > 15) { + throw new IllegalArgumentException(); + } + return INVERSE_LUT[value]; + } + + }; + + /** + * The DNS message id. + */ + protected int id; + + /** + * The DNS message opcode. + */ + protected OPCODE opcode; + + /** + * The response code of this dns message. + */ + protected RESPONSE_CODE responseCode; + + /** + * True if this is a query. + */ + protected boolean query; + + /** + * True if this is a authorative response. + */ + protected boolean authoritativeAnswer; + + /** + * True on truncate, tcp should be used. + */ + protected boolean truncated; + + /** + * True if the server should recurse. + */ + protected boolean recursionDesired; + + /** + * True if recursion is possible. + */ + protected boolean recursionAvailable; + + /** + * True if the server regarded the response as authentic. + */ + protected boolean authenticData; + + /** + * True if the server should not check the replies. + */ + protected boolean checkDisabled; + + /** + * The question section content. + */ + protected Question questions[]; + + /** + * The answers section content. + */ + protected Record answers[]; + + /** + * The nameserver records. + */ + protected Record nameserverRecords[]; + + /** + * Additional resousrce records. + */ + protected Record additionalResourceRecords[]; + + /** + * The receive timestamp of this message. + */ + protected long receiveTimestamp; + + /** + * Retrieve the current DNS message id. + * @return The current DNS message id. + */ + public int getId() { + return id; + } + + /** + * Set the current DNS message id. + * @param id The new DNS message id. + */ + public void setId(int id) { + this.id = id & 0xffff; + } + + /** + * Get the receive timestamp if this message was created via parse. + * This should be used to evaluate TTLs. + * @return The receive timestamp in milliseconds. + */ + public long getReceiveTimestamp() { + return receiveTimestamp; + } + + /** + * Retrieve the query type (true or false; + * @return True if this DNS message is a query. + */ + public boolean isQuery() { + return query; + } + + /** + * Set the query status of this message. + * @param query The new query status. + */ + public void setQuery(boolean query) { + this.query = query; + } + + /** + * True if the DNS message is an authoritative answer. + * @return True if this an authoritative DNS message. + */ + public boolean isAuthoritativeAnswer() { + return authoritativeAnswer; + } + + /** + * Set the authoritative answer flag. + * @param authoritativeAnswer Tge new authoritative answer value. + */ + public void setAuthoritativeAnswer(boolean authoritativeAnswer) { + this.authoritativeAnswer = authoritativeAnswer; + } + + /** + * Retrieve the truncation status of this message. True means that the + * client should try a tcp lookup. + * @return True if this message was truncated. + */ + public boolean isTruncated() { + return truncated; + } + + /** + * Set the truncation bit on this DNS message. + * @param truncated The new truncated bit status. + */ + public void setTruncated(boolean truncated) { + this.truncated = truncated; + } + + /** + * Check if this message preferes recursion. + * @return True if recursion is desired. + */ + public boolean isRecursionDesired() { + return recursionDesired; + } + + /** + * Set the recursion desired flag on this message. + * @param recursionDesired The new recusrion setting. + */ + public void setRecursionDesired(boolean recursionDesired) { + this.recursionDesired = recursionDesired; + } + + /** + * Retrieve the recursion available flag of this DNS message. + * @return The recursion available flag of this message. + */ + public boolean isRecursionAvailable() { + return recursionAvailable; + } + + /** + * Set the recursion available flog from this DNS message. + * @param recursionAvailable The new recursion available status. + */ + public void setRecursionAvailable(boolean recursionAvailable) { + this.recursionAvailable = recursionAvailable; + } + + /** + * Retrieve the authentic data flag of this message. + * @return The authentic data flag. + */ + public boolean isAuthenticData() { + return authenticData; + } + + /** + * Set the authentic data flag on this DNS message. + * @param authenticData The new authentic data flag value. + */ + public void setAuthenticData(boolean authenticData) { + this.authenticData = authenticData; + } + + /** + * Check if checks are disabled. + * @return The status of the CheckDisabled flag. + */ + public boolean isCheckDisabled() { + return checkDisabled; + } + + /** + * Change the check status of this packet. + * @param checkDisabled The new check disabled value. + */ + public void setCheckDisabled(boolean checkDisabled) { + this.checkDisabled = checkDisabled; + } + + /** + * Generate a binary dns packet out of this message. + * @return byte[] the binary representation. + * @throws IOException Should never happen. + */ + public byte[] toArray() throws IOException { + ByteArrayOutputStream baos = new ByteArrayOutputStream(512); + DataOutputStream dos = new DataOutputStream(baos); + int header = 0; + if (query) { + header += 1 << 15; + } + if (opcode != null) { + header += opcode.getValue() << 11; + } + if (authoritativeAnswer) { + header += 1 << 10; + } + if (truncated) { + header += 1 << 9; + } + if (recursionDesired) { + header += 1 << 8; + } + if (recursionAvailable) { + header += 1 << 7; + } + if (authenticData) { + header += 1 << 5; + } + if (checkDisabled) { + header += 1 << 4; + } + if (responseCode != null) { + header += responseCode.getValue(); + } + dos.writeShort((short)id); + dos.writeShort((short)header); + if (questions == null) { + dos.writeShort(0); + } else { + dos.writeShort((short)questions.length); + } + if (answers == null) { + dos.writeShort(0); + } else { + dos.writeShort((short)answers.length); + } + if (nameserverRecords == null) { + dos.writeShort(0); + } else { + dos.writeShort((short)nameserverRecords.length); + } + if (additionalResourceRecords == null) { + dos.writeShort(0); + } else { + dos.writeShort((short)additionalResourceRecords.length); + } + for (Question question: questions) { + dos.write(question.toByteArray()); + } + dos.flush(); + return baos.toByteArray(); + } + + /** + * Build a DNS Message based on a binary DNS message. + * @param data The DNS message data. + * @return Parsed DNSMessage message. + * @throws IOException On read errors. + */ + public static DNSMessage parse(byte data[]) throws IOException { + ByteArrayInputStream bis = new ByteArrayInputStream(data); + DataInputStream dis = new DataInputStream(bis); + DNSMessage message = new DNSMessage(); + message.id = dis.readUnsignedShort(); + int header = dis.readUnsignedShort(); + message.query = ((header >> 15) & 1) == 0; + message.opcode = OPCODE.getOpcode((header >> 11) & 0xf); + message.authoritativeAnswer = ((header >> 10) & 1) == 1; + message.truncated = ((header >> 9) & 1) == 1; + message.recursionDesired = ((header >> 8) & 1) == 1; + message.recursionAvailable = ((header >> 7) & 1) == 1; + message.authenticData = ((header >> 5) & 1) == 1; + message.checkDisabled = ((header >> 4) & 1) == 1; + message.responseCode = RESPONSE_CODE.getResponseCode(header & 0xf); + message.receiveTimestamp = System.currentTimeMillis(); + int questionCount = dis.readUnsignedShort(); + int answerCount = dis.readUnsignedShort(); + int nameserverCount = dis.readUnsignedShort(); + int additionalResourceRecordCount = dis.readUnsignedShort(); + message.questions = new Question[questionCount]; + while (questionCount-- > 0) { + Question q = Question.parse(dis, data); + message.questions[questionCount] = q; + } + message.answers = new Record[answerCount]; + while (answerCount-- > 0) { + Record rr = new Record(); + rr.parse(dis, data); + message.answers[answerCount] = rr; + } + message.nameserverRecords = new Record[nameserverCount]; + while (nameserverCount-- > 0) { + Record rr = new Record(); + rr.parse(dis, data); + message.nameserverRecords[nameserverCount] = rr; + } + message.additionalResourceRecords = + new Record[additionalResourceRecordCount]; + while (additionalResourceRecordCount-- > 0) { + Record rr = new Record(); + rr.parse(dis, data); + message.additionalResourceRecords[additionalResourceRecordCount] = + rr; + } + return message; + } + + /** + * Set the question part of this message. + * @param questions The questions. + */ + public void setQuestions(Question ... questions) { + this.questions = questions; + } + + /** + * Retrieve the opcode of this message. + * @return The opcode of this message. + */ + public OPCODE getOpcode() { + return opcode; + } + + /** + * Retrieve the response code of this message. + * @return The response code. + */ + public RESPONSE_CODE getResponseCode() { + return responseCode; + } + + /** + * Retrieve the question section of this message. + * @return The DNS question section. + */ + public Question[] getQuestions() { + return questions; + } + + /** + * Retrieve the answer records of this DNS message. + * @return The answer section of this DNS message. + */ + public Record[] getAnswers() { + return answers; + } + + /** + * Retrieve the nameserver records of this DNS message. + * @return The nameserver section of this DNS message. + */ + public Record[] getNameserverRecords() { + return nameserverRecords; + } + + /** + * Retrieve the additional resource records attached to this DNS message. + * @return The additional resource record section of this DNS message. + */ + public Record[] getAdditionalResourceRecords() { + return additionalResourceRecords; + } + + public String toString() { + return "-- DNSMessage " + id + " --\n" + + "Q" + Arrays.toString(questions) + + "NS" + Arrays.toString(nameserverRecords) + + "A" + Arrays.toString(answers) + + "ARR" + Arrays.toString(additionalResourceRecords); + } + +} diff --git a/libs/minidns/src/main/java/de/measite/minidns/LRUCache.java b/libs/minidns/src/main/java/de/measite/minidns/LRUCache.java new file mode 100644 index 00000000..6b9bbdc1 --- /dev/null +++ b/libs/minidns/src/main/java/de/measite/minidns/LRUCache.java @@ -0,0 +1,139 @@ +package de.measite.minidns; + +import java.util.LinkedHashMap; +import java.util.Map.Entry; + +/** + * LRU based DNSCache backed by a LinkedHashMap. + */ +public class LRUCache implements DNSCache { + + /** + * Internal miss count. + */ + protected long missCount = 0l; + + /** + * Internal expire count (subset of misses that was caused by expire). + */ + protected long expireCount = 0l; + + /** + * Internal hit count. + */ + protected long hitCount = 0l; + + /** + * The internal capacity of the backend cache. + */ + protected int capacity; + + /** + * The upper bound of the ttl. All longer TTLs will be capped by this ttl. + */ + protected long maxTTL; + + /** + * The backend cache. + */ + protected LinkedHashMap backend; + + /** + * Create a new LRUCache with given capacity and upper bound ttl. + * @param capacity The internal capacity. + * @param maxTTL The upper bound for any ttl. + */ + @SuppressWarnings("serial") + public LRUCache(final int capacity, final long maxTTL) { + this.capacity = capacity; + this.maxTTL = maxTTL; + backend = new LinkedHashMap( + Math.min(capacity + (capacity + 3) / 4 + 2, 11), 0.75f, true) + { + @Override + protected boolean removeEldestEntry( + Entry eldest) { + return size() > capacity; + } + }; + } + + /** + * Create a new LRUCache with given capacity. + * @param capacity The capacity of this cache. + */ + public LRUCache(final int capacity) { + this(capacity, Long.MAX_VALUE); + } + + @Override + public synchronized void put(Question q, DNSMessage message) { + if (message.getReceiveTimestamp() <= 0l) { + return; + } + backend.put(q, message); + } + + @Override + public synchronized DNSMessage get(Question q) { + DNSMessage message = backend.get(q); + if (message == null) { + missCount++; + return null; + } + + long ttl = maxTTL; + for (Record r : message.getAnswers()) { + ttl = Math.min(ttl, r.ttl); + } + for (Record r : message.getAdditionalResourceRecords()) { + ttl = Math.min(ttl, r.ttl); + } + if (message.getReceiveTimestamp() + ttl > System.currentTimeMillis()) { + missCount++; + expireCount++; + backend.remove(q); + return null; + } else { + hitCount++; + return message; + } + } + + /** + * Clear all entries in this cache. + */ + public synchronized void clear() { + backend.clear(); + missCount = 0l; + hitCount = 0l; + expireCount = 0l; + } + + /** + * Get the miss count of this cache which is the number of fruitless + * get calls since this cache was last resetted. + * @return The number of cache misses. + */ + public long getMissCount() { + return missCount; + } + + /** + * The number of expires (cache hits that have had a ttl to low to be + * retrieved). + * @return The expire count. + */ + public long getExpireCount() { + return expireCount; + } + + /** + * The cache hit count (all sucessful calls to get). + * @return The hit count. + */ + public long getHitCount() { + return hitCount; + } + +} diff --git a/libs/minidns/src/main/java/de/measite/minidns/Question.java b/libs/minidns/src/main/java/de/measite/minidns/Question.java new file mode 100644 index 00000000..3b2fa1a1 --- /dev/null +++ b/libs/minidns/src/main/java/de/measite/minidns/Question.java @@ -0,0 +1,158 @@ +package de.measite.minidns; + +import java.io.ByteArrayOutputStream; +import java.io.DataInputStream; +import java.io.DataOutputStream; +import java.io.IOException; +import java.util.Arrays; + +import de.measite.minidns.Record.CLASS; +import de.measite.minidns.Record.TYPE; +import de.measite.minidns.util.NameUtil; + +/** + * A DNS question (request). + */ +public class Question { + + /** + * The question string (e.g. "measite.de"). + */ + private final String name; + + /** + * The question type (e.g. A). + */ + private final TYPE type; + + /** + * The question class (usually IN / internet). + */ + private final CLASS clazz; + + /** + * UnicastQueries have the highest bit of the CLASS field set to 1. + */ + private final boolean unicastQuery; + + /** + * Cache for the serialized object. + */ + private byte[] byteArray; + + /** + * Create a dns question for the given name/type/class. + * @param name The name e.g. "measite.de". + * @param type The type, e.g. A. + * @param clazz The class, usually IN (internet). + */ + public Question(String name, TYPE type, CLASS clazz, boolean unicastQuery) { + this.name = name; + this.type = type; + this.clazz = clazz; + this.unicastQuery = unicastQuery; + } + + /** + * Create a dns question for the given name/type/class. + * @param name The name e.g. "measite.de". + * @param type The type, e.g. A. + * @param clazz The class, usually IN (internet). + */ + public Question(String name, TYPE type, CLASS clazz) { + this(name, type, clazz, false); + } + + /** + * Create a dns question for the given name/type/IN (internet class). + * @param name The name e.g. "measite.de". + * @param type The type, e.g. A. + */ + public Question(String name, TYPE type) { + this(name, type, CLASS.IN); + } + + /** + * Retrieve the type of this question. + * @return The type. + */ + public TYPE getType() { + return type; + } + + /** + * Retrieve the class of this dns question (usually internet). + * @return The class of this dns question. + */ + public CLASS getClazz() { + return clazz; + } + + /** + * Retrieve the name of this dns question (e.g. "measite.de"). + * @return The name of this dns question. + */ + public String getName() { + return name; + } + + /** + * Parse a byte array and rebuild the dns question from it. + * @param dis The input stream. + * @param data The plain data (for dns name references). + * @return The parsed dns question. + * @throws IOException On errors (read outside of packet). + */ + public static Question parse(DataInputStream dis, byte[] data) throws IOException { + String name = NameUtil.parse(dis, data); + TYPE type = TYPE.getType(dis.readUnsignedShort()); + CLASS clazz = CLASS.getClass(dis.readUnsignedShort()); + return new Question (name, type, clazz); + } + + /** + * Generate a binary paket for this dns question. + * @return The dns question. + */ + public byte[] toByteArray() { + if (byteArray == null) { + ByteArrayOutputStream baos = new ByteArrayOutputStream(512); + DataOutputStream dos = new DataOutputStream(baos); + + try { + dos.write(NameUtil.toByteArray(this.name)); + dos.writeShort(type.getValue()); + dos.writeShort(clazz.getValue() | (unicastQuery ? (1 << 15) : 0)); + dos.flush(); + } catch (IOException e) { + // Should never happen + throw new IllegalStateException(e); + } + byteArray = baos.toByteArray(); + } + return byteArray; + } + + @Override + public int hashCode() { + return Arrays.hashCode(toByteArray()); + } + + @Override + public boolean equals(Object other) { + if (this == other) { + return true; + } + if (!(other instanceof Question)) { + return false; + } + byte t[] = toByteArray(); + byte o[] = ((Question)other).toByteArray(); + return Arrays.equals(t, o); + } + + @Override + public String toString() { + return "Question/" + clazz + "/" + type + ": " + name; + } +} diff --git a/libs/minidns/src/main/java/de/measite/minidns/Record.java b/libs/minidns/src/main/java/de/measite/minidns/Record.java new file mode 100644 index 00000000..ab081426 --- /dev/null +++ b/libs/minidns/src/main/java/de/measite/minidns/Record.java @@ -0,0 +1,343 @@ +package de.measite.minidns; + +import java.io.DataInputStream; +import java.io.IOException; +import java.util.HashMap; +import java.util.logging.Level; +import java.util.logging.Logger; + +import de.measite.minidns.record.A; +import de.measite.minidns.record.AAAA; +import de.measite.minidns.record.CNAME; +import de.measite.minidns.record.Data; +import de.measite.minidns.record.NS; +import de.measite.minidns.record.PTR; +import de.measite.minidns.record.SRV; +import de.measite.minidns.record.TXT; +import de.measite.minidns.util.NameUtil; + +/** + * A generic DNS record. + */ +public class Record { + + private static final Logger LOGGER = Logger.getLogger(Client.class.getName()); + + /** + * The record type. + * @see IANA DNS Parameters + */ + public static enum TYPE { + A(1), + NS(2), + MD(3), + MF(4), + CNAME(5), + SOA(6), + MB(7), + MG(8), + MR(9), + NULL(10), + WKS(11), + PTR(12), + HINFO(13), + MINFO(14), + MX(15), + TXT(16), + RP(17), + AFSDB(18), + X25(19), + ISDN(20), + RT(21), + NSAP(22), + NSAP_PTR(23), + SIG(24), + KEY(25), + PX(26), + GPOS(27), + AAAA(28), + LOC(29), + NXT(30), + EID(31), + NIMLOC(32), + SRV(33), + ATMA(34), + NAPTR(35), + KX(36), + CERT(37), + A6(38), + DNAME(39), + SINK(40), + OPT(41), + APL(42), + DS(43), + SSHFP(44), + IPSECKEY(45), + RRSIG(46), + NSEC(47), + DNSKEY(48), + DHCID(49), + NSEC3(50), + NSEC3PARAM(51), + HIP(55), + NINFO(56), + RKEY(57), + TALINK(58), + SPF(99), + UINFO(100), + UID(101), + GID(102), + TKEY(249), + TSIG(250), + IXFR(251), + AXFR(252), + MAILB(253), + MAILA(254), + ANY(255), + TA(32768), + DLV(32769); + + /** + * The value of this DNS record type. + */ + private final int value; + + /** + * Internal lookup table to map values to types. + */ + private final static HashMap INVERSE_LUT = + new HashMap(); + + /** + * Initialize the reverse lookup table. + */ + static { + for(TYPE t: TYPE.values()) { + INVERSE_LUT.put(t.getValue(), t); + } + } + + /** + * Create a new record type. + * @param value The binary value of this type. + */ + private TYPE(int value) { + this.value = value; + } + + /** + * Retrieve the binary value of this type. + * @return The binary value. + */ + public int getValue() { + return value; + } + + /** + * Retrieve the symbolic type of the binary value. + * @param value The binary type value. + * @return The symbolic tpye. + */ + public static TYPE getType(int value) { + return INVERSE_LUT.get(value); + } + }; + + /** + * The symbolic class of a DNS record (usually IN for Internet). + */ + public static enum CLASS { + IN(1), + CH(3), + HS(4), + NONE(254), + ANY(255); + + /** + * Internal reverse lookup table to map binary class values to symbolic + * names. + */ + private final static HashMap INVERSE_LUT = + new HashMap(); + + /** + * Initialize the interal reverse lookup table. + */ + static { + for(CLASS c: CLASS.values()) { + INVERSE_LUT.put(c.getValue(), c); + } + } + + /** + * The binary value of this dns class. + */ + private final int value; + + /** + * Create a new DNS class based on a binary value. + * @param value The binary value of this DNS class. + */ + private CLASS(int value) { + this.value = value; + } + + /** + * Retrieve the binary value of this DNS class. + * @return The binary value of this DNS class. + */ + public int getValue() { + return value; + } + + /** + * Retrieve the symbolic DNS class for a binary class value. + * @param value The binary DNS class value. + * @return The symbolic class instance. + */ + public static CLASS getClass(int value) { + return INVERSE_LUT.get(value); + } + + } + + /** + * The generic name of this record. + */ + protected String name; + + /** + * The type (and payload type) of this record. + */ + protected TYPE type; + + /** + * The record class (usually CLASS.IN). + */ + protected CLASS clazz; + + /** + * The ttl of this record. + */ + protected long ttl; + + /** + * The payload object of this record. + */ + protected Data payloadData; + + /** + * MDNS defines the highest bit of the class as the unicast query bit. + */ + protected boolean unicastQuery; + + /** + * Parse a given record based on the full message data and the current + * stream position. + * @param dis The DataInputStream positioned at the first record byte. + * @param data The full message data. + * @throws IOException In case of malformed replies. + */ + public void parse(DataInputStream dis, byte[] data) throws IOException { + this.name = NameUtil.parse(dis, data); + this.type = TYPE.getType(dis.readUnsignedShort()); + int clazzValue = dis.readUnsignedShort(); + this.clazz = CLASS.getClass(clazzValue & 0x7fff); + this.unicastQuery = (clazzValue & 0x8000) > 0; + if (this.clazz == null) { + LOGGER.log(Level.FINE, "Unknown class " + clazzValue); + } + this.ttl = (((long)dis.readUnsignedShort()) << 32) + + dis.readUnsignedShort(); + int payloadLength = dis.readUnsignedShort(); + switch (this.type) { + case SRV: + this.payloadData = new SRV(); + break; + case AAAA: + this.payloadData = new AAAA(); + break; + case A: + this.payloadData = new A(); + break; + case NS: + this.payloadData = new NS(); + break; + case CNAME: + this.payloadData = new CNAME(); + break; + case PTR: + this.payloadData = new PTR(); + break; + case TXT: + this.payloadData = new TXT(); + break; + default: + LOGGER.log(Level.FINE, "Unparsed type " + type); + this.payloadData = null; + for (int i = 0; i < payloadLength; i++) { + dis.readByte(); + } + break; + } + if (this.payloadData != null) { + this.payloadData.parse(dis, data, payloadLength); + } + } + + /** + * Retrieve a textual representation of this resource record. + * @return String + */ + @Override + public String toString() { + if (payloadData == null) { + return "RR " + type + "/" + clazz; + } + return "RR " + type + "/" + clazz + ": " + payloadData.toString(); + }; + + /** + * Check if this record answers a given query. + * @param q The query. + * @return True if this record is a valid answer. + */ + public boolean isAnswer(Question q) { + return ((q.getType() == type) || (q.getType() == TYPE.ANY)) && + ((q.getClazz() == clazz) || (q.getClazz() == CLASS.ANY)) && + (q.getName().equals(name)); + } + + /** + * See if this query/response was a unicast query (highest class bit set). + * @return True if it is a unicast query/response record. + */ + public boolean isUnicastQuery() { + return unicastQuery; + } + + /** + * The generic record name, e.g. "measite.de". + * @return The record name. + */ + public String getName() { + return name; + } + + /** + * The payload data, usually a subclass of data (A, AAAA, CNAME, ...). + * @return The payload data. + */ + public Data getPayload() { + return payloadData; + } + + /** + * Retrieve the record ttl. + * @return The record ttl. + */ + public long getTtl() { + return ttl; + } + +} diff --git a/libs/minidns/src/main/java/de/measite/minidns/record/A.java b/libs/minidns/src/main/java/de/measite/minidns/record/A.java new file mode 100644 index 00000000..4311c651 --- /dev/null +++ b/libs/minidns/src/main/java/de/measite/minidns/record/A.java @@ -0,0 +1,43 @@ +package de.measite.minidns.record; + +import java.io.DataInputStream; +import java.io.IOException; + +import de.measite.minidns.Record.TYPE; + +/** + * A record payload (ip pointer). + */ +public class A implements Data { + + /** + * Target IP. + */ + private byte[] ip; + + @Override + public TYPE getType() { + return TYPE.A; + } + + @Override + public byte[] toByteArray() { + return ip; + } + + @Override + public void parse(DataInputStream dis, byte[] data, int length) + throws IOException { + ip = new byte[4]; + dis.readFully(ip); + } + + @Override + public String toString() { + return Integer.toString(ip[0] & 0xff) + "." + + Integer.toString(ip[1] & 0xff) + "." + + Integer.toString(ip[2] & 0xff) + "." + + Integer.toString(ip[3] & 0xff); + } + +} diff --git a/libs/minidns/src/main/java/de/measite/minidns/record/AAAA.java b/libs/minidns/src/main/java/de/measite/minidns/record/AAAA.java new file mode 100644 index 00000000..e4fd5ecf --- /dev/null +++ b/libs/minidns/src/main/java/de/measite/minidns/record/AAAA.java @@ -0,0 +1,49 @@ +package de.measite.minidns.record; + +import java.io.DataInputStream; +import java.io.IOException; + +import de.measite.minidns.Record.TYPE; + +/** + * AAAA payload (an ipv6 pointer). + */ +public class AAAA implements Data { + + /** + * The ipv6 address. + */ + private byte[] ip; + + @Override + public TYPE getType() { + return TYPE.AAAA; + } + + @Override + public byte[] toByteArray() { + return ip; + } + + @Override + public void parse(DataInputStream dis, byte[] data, int length) + throws IOException { + ip = new byte[16]; + dis.readFully(ip); + } + + @Override + public String toString() { + StringBuilder sb = new StringBuilder(); + for (int i = 0; i < ip.length; i += 2) { + if (i != 0) { + sb.append(':'); + } + sb.append(Integer.toHexString( + ((ip[i] & 0xff) << 8) + (ip[i + 1] & 0xff) + )); + } + return sb.toString(); + } + +} diff --git a/libs/minidns/src/main/java/de/measite/minidns/record/CNAME.java b/libs/minidns/src/main/java/de/measite/minidns/record/CNAME.java new file mode 100644 index 00000000..1ac27814 --- /dev/null +++ b/libs/minidns/src/main/java/de/measite/minidns/record/CNAME.java @@ -0,0 +1,46 @@ +package de.measite.minidns.record; + +import java.io.DataInputStream; +import java.io.IOException; + +import de.measite.minidns.Record.TYPE; +import de.measite.minidns.util.NameUtil; + +/** + * CNAME payload (pointer to another domain / address). + */ +public class CNAME implements Data { + + protected String name; + + public String getName() { + return name; + } + + public void setName(String name) { + this.name = name; + } + + @Override + public byte[] toByteArray() { + throw new UnsupportedOperationException("Not implemented yet"); + } + + @Override + public void parse(DataInputStream dis, byte[] data, int length) + throws IOException + { + this.name = NameUtil.parse(dis, data); + } + + @Override + public TYPE getType() { + return TYPE.CNAME; + } + + @Override + public String toString() { + return "to \"" + name + "\""; + } + +} diff --git a/libs/minidns/src/main/java/de/measite/minidns/record/Data.java b/libs/minidns/src/main/java/de/measite/minidns/record/Data.java new file mode 100644 index 00000000..7f2db03a --- /dev/null +++ b/libs/minidns/src/main/java/de/measite/minidns/record/Data.java @@ -0,0 +1,34 @@ +package de.measite.minidns.record; + +import java.io.DataInputStream; +import java.io.IOException; + +import de.measite.minidns.Record.TYPE; + +/** + * Generic payload class. + */ +public interface Data { + + /** + * The payload type. + * @return The payload type. + */ + TYPE getType(); + + /** + * Binary representation of this payload. + * @return The binary representation of this payload. + */ + byte[] toByteArray(); + + /** + * Parse this payload. + * @param dis The input stream. + * @param data The plain data (needed for name cross references). + * @param length The payload length. + * @throws IOException on io error (read past paket boundary). + */ + void parse(DataInputStream dis, byte data[], int length) throws IOException; + +} diff --git a/libs/minidns/src/main/java/de/measite/minidns/record/NS.java b/libs/minidns/src/main/java/de/measite/minidns/record/NS.java new file mode 100644 index 00000000..8ac2d4c3 --- /dev/null +++ b/libs/minidns/src/main/java/de/measite/minidns/record/NS.java @@ -0,0 +1,15 @@ +package de.measite.minidns.record; + +import de.measite.minidns.Record.TYPE; + +/** + * Nameserver record. + */ +public class NS extends CNAME { + + @Override + public TYPE getType() { + return TYPE.NS; + } + +} diff --git a/libs/minidns/src/main/java/de/measite/minidns/record/PTR.java b/libs/minidns/src/main/java/de/measite/minidns/record/PTR.java new file mode 100644 index 00000000..6e200655 --- /dev/null +++ b/libs/minidns/src/main/java/de/measite/minidns/record/PTR.java @@ -0,0 +1,19 @@ +package de.measite.minidns.record; + +import java.io.DataInputStream; +import java.io.IOException; + +import de.measite.minidns.Record.TYPE; +import de.measite.minidns.util.NameUtil; + +/** + * A PTR record is handled like a CNAME + */ +public class PTR extends CNAME { + + @Override + public TYPE getType() { + return TYPE.PTR; + } + +} diff --git a/libs/minidns/src/main/java/de/measite/minidns/record/SRV.java b/libs/minidns/src/main/java/de/measite/minidns/record/SRV.java new file mode 100644 index 00000000..707bf3f5 --- /dev/null +++ b/libs/minidns/src/main/java/de/measite/minidns/record/SRV.java @@ -0,0 +1,124 @@ +package de.measite.minidns.record; + +import java.io.DataInputStream; +import java.io.IOException; + +import de.measite.minidns.Record.TYPE; +import de.measite.minidns.util.NameUtil; + +/** + * SRV record payload (service pointer). + */ +public class SRV implements Data { + + /** + * The priority of this service. + */ + protected int priority; + + /** + * The weight of this service. + */ + protected int weight; + + /** + * The target port. + */ + protected int port; + + /** + * The target server. + */ + protected String name; + + /** + * The priority of this service. Lower values mean higher priority. + * @return The priority. + */ + public int getPriority() { + return priority; + } + + /** + * Set the priority of this service entry. Lower values have higher priority. + * @param priority The new priority. + */ + public void setPriority(int priority) { + this.priority = priority; + } + + /** + * The weight of this service. Services with the same priority should be + * balanced based on weight. + * @return The weight of this service. + */ + public int getWeight() { + return weight; + } + + /** + * Set the weight of this service. + * @param weight The new weight of this service. + */ + public void setWeight(int weight) { + this.weight = weight; + } + + /** + * The target port of this service. + * @return The target port of this service. + */ + public int getPort() { + return port; + } + + /** + * Set the target port of this service. + * @param port The new target port. + */ + public void setPort(int port) { + this.port = port; + } + + /** + * The name of the target server. + * @return The target servers name. + */ + public String getName() { + return name; + } + + /** + * Set the name of the target server. + * @param name The new target servers name. + */ + public void setName(String name) { + this.name = name; + } + + @Override + public byte[] toByteArray() { + throw new UnsupportedOperationException("Not implemented yet"); + } + + @Override + public void parse(DataInputStream dis, byte[] data, int length) + throws IOException + { + this.priority = dis.readUnsignedShort(); + this.weight = dis.readUnsignedShort(); + this.port = dis.readUnsignedShort(); + this.name = NameUtil.parse(dis, data); + } + + @Override + public String toString() { + return "SRV " + name + ":" + port + " p:" + priority + " w:" + weight; + } + + @Override + public TYPE getType() { + return TYPE.SRV; + } + +} diff --git a/libs/minidns/src/main/java/de/measite/minidns/record/TXT.java b/libs/minidns/src/main/java/de/measite/minidns/record/TXT.java new file mode 100644 index 00000000..03e73040 --- /dev/null +++ b/libs/minidns/src/main/java/de/measite/minidns/record/TXT.java @@ -0,0 +1,65 @@ +package de.measite.minidns.record; + +import java.io.DataInputStream; +import java.io.IOException; + +import de.measite.minidns.Record.TYPE; +import de.measite.minidns.util.NameUtil; + +/** + * TXT record (actually a binary blob with wrappers for text content). + */ +public class TXT implements Data { + + protected byte[] blob; + + public byte[] getBlob() { + return blob; + } + + public void setBlob(byte[] blob) { + this.blob = blob; + } + + public String getText() { + try { + return (new String(blob, "UTF-8")).intern(); + } catch (Exception e) { + /* Can't happen for UTF-8 unless it's really a blob */ + return null; + } + } + + public void setText(String text) { + try { + this.blob = text.getBytes("UTF-8"); + } catch (Exception e) { + /* Can't happen, UTF-8 IS supported */ + throw new RuntimeException("UTF-8 not supported", e); + } + } + + @Override + public byte[] toByteArray() { + throw new UnsupportedOperationException("Not implemented yet"); + } + + @Override + public void parse(DataInputStream dis, byte[] data, int length) + throws IOException + { + blob = new byte[length]; + dis.readFully(blob); + } + + @Override + public TYPE getType() { + return TYPE.TXT; + } + + @Override + public String toString() { + return "\"" + getText() + "\""; + } + +} diff --git a/libs/minidns/src/main/java/de/measite/minidns/util/NameUtil.java b/libs/minidns/src/main/java/de/measite/minidns/util/NameUtil.java new file mode 100644 index 00000000..7ae373bc --- /dev/null +++ b/libs/minidns/src/main/java/de/measite/minidns/util/NameUtil.java @@ -0,0 +1,129 @@ +package de.measite.minidns.util; + +import java.io.ByteArrayOutputStream; +import java.io.DataInputStream; +import java.io.DataOutputStream; +import java.io.IOException; +import java.net.IDN; +import java.util.HashSet; +import java.util.Arrays; + +/** + * Utilities related to internationalized domain names and dns name handling. + */ +public class NameUtil { + + /** + * Retrieve the rough binary length of a string + * (length + 2 bytes length prefix). + * @param name The name string. + * @return The binary size of the string (length + 2). + */ + public static int size(String name) { + return name.length() + 2; + } + + /** + * Check if two internationalized domain names are equal, possibly causing + * a serialization of both domain names. + * @param name1 The first domain name. + * @param name2 The second domain name. + * @return True if both domain names are the same. + */ + public static boolean idnEquals(String name1, String name2) { + if (name1 == name2) return true; // catches null, null + if (name1 == null) return false; + if (name2 == null) return false; + if (name1.equals(name2)) return true; + + try { + return Arrays.equals(toByteArray(name1),toByteArray(name2)); + } catch (IOException e) { + return false; // impossible + } + } + + /** + * Serialize a domain name under IDN rules. + * @param name The domain name. + * @return The binary domain name representation. + * @throws IOException Should never happen. + */ + public static byte[] toByteArray(String name) throws IOException { + ByteArrayOutputStream baos = new ByteArrayOutputStream(64); + DataOutputStream dos = new DataOutputStream(baos); + for (String s: name.split("[.\u3002\uFF0E\uFF61]")) { + byte[] buffer = IDN.toASCII(s).getBytes(); + dos.writeByte(buffer.length); + dos.write(buffer); + } + dos.writeByte(0); + dos.flush(); + return baos.toByteArray(); + } + + /** + * Parse a domain name starting at the current offset and moving the input + * stream pointer past this domain name (even if cross references occure). + * @param dis The input stream. + * @param data The raw data (for cross references). + * @return The domain name string. + * @throws IOException Should never happen. + */ + public static String parse(DataInputStream dis, byte data[]) + throws IOException + { + int c = dis.readUnsignedByte(); + if ((c & 0xc0) == 0xc0) { + c = ((c & 0x3f) << 8) + dis.readUnsignedByte(); + HashSet jumps = new HashSet(); + jumps.add(c); + return parse(data, c, jumps); + } + if (c == 0) { + return ""; + } + byte b[] = new byte[c]; + dis.readFully(b); + String s = IDN.toUnicode(new String(b)); + String t = parse(dis, data); + if (t.length() > 0) { + s = s + "." + t; + } + return s; + } + + /** + * Parse a domain name starting at the given offset. + * @param data The raw data. + * @param offset The offset. + * @param jumps The list of jumps (by now). + * @return The parsed domain name. + * @throws IllegalStateException on cycles. + */ + public static String parse( + byte data[], + int offset, + HashSet jumps + ) { + int c = data[offset] & 0xff; + if ((c & 0xc0) == 0xc0) { + c = ((c & 0x3f) << 8) + (data[offset + 1] & 0xff); + if (jumps.contains(c)) { + throw new IllegalStateException("Cyclic offsets detected."); + } + jumps.add(c); + return parse(data, c, jumps); + } + if (c == 0) { + return ""; + } + String s = new String(data,offset + 1, c); + String t = parse(data, offset + 1 + c, jumps); + if (t.length() > 0) { + s = s + "." + t; + } + return s; + } + +}