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diff --git a/0.8/README b/0.8/README deleted file mode 100644 index e8aac49..0000000 --- a/0.8/README +++ /dev/null @@ -1,668 +0,0 @@ -yChat; Homepage: ychat.buetow.org; Version 0.9.0-CURRENT - -Copyright (C) 2003 Paul C. Buetow, Volker Richter -Copyright (C) 2004 Paul C. Buetow -Copyright (C) 2005 EXA Digital Solutions GbR -Copyright (C) 2006, 2007 Paul C. Buetow ------------------------------------------------------------------ -This program is free software; you can redistribute it and/or -modify it under the terms of the GNU General Public License -as published by the Free Software Foundation; either version 2 -of the License, or (at your option) any later version. - -This program is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -GNU General Public License for more details. - -You should have received a copy of the GNU General Public License -along with this program; if not, write to the Free Software -Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. ------------------------------------------------------------------ - -YCHAT TABLE OF CONTENTS: - -1.0.0 GENERAL -1.1.0 ABOUT RELEASES -1.2.0 YCHAT FEATURES //<< -2.0.0 INSTALLATION AND SETUP -2.1.0 REQUIREMENTS -2.2.0 TESTED PLATFORMS -2.3.0 HOW TO OBTAIN YCHAT -2.4.0 INSTALLATION QUICK-START -2.4.1 INSTALLATION -2.5.0 HOW TO USE OPENSSL WITH YCHAT -2.5.1 HOW TO USE SCREEN WITH YCHAT -2.5.2 HOW TO USE SIGNALS WITH YCHAT -2.5.3 HOW TO USE GNU READLINE WITH YCHAT -2.5.4 HOW TO USE MYSQL WITH YCHAT //<< -2.6.0 CUSTOMIZING YCHAT -2.7.0 YHTTPD CODE BASE GENERATION //<< -3.0.0 EXTENDING YCHAT -3.1.0 SOURCE FILES -4.0.0 DIVERSE -4.1.0 WRITING BUG REPORTS -4.2.0 CONTACT ADDRESSES -4.3.0 CREDITS - -1.0.0 GENERAL - -1.1.0 ABOUT RELEASES - -There are several projects involved: - -- The chat - -Its a HTTP based chat server written in C++. Clients are normal web browsers -such as MSIE or Gecko based browsers using only CSS, HTML and JavaScript. - -- The httpd - -Its a small http server based on the chat's socket and threading engine. -yhttpd does not have as much features but is easy to use and faster than -apache. yhttpd is a subset of the chat. It can be generated using the -srcipts/yhttpdbase.pl script in the chat's source tree. - -There are different branches: - -- CURRENT - -The CURRENT branch is unstable, this is the bleeding developing edge with -all the new experimental features. - -A RELEASE of CURRENT can be referred as CURRENTRELEASE. - -- STABLE - -The STABLE branch is more stable than CURRENT. This branch may get new -features as well. But those will be more conservative compared to -CURRENT. - -A RELEASE of STABLE can be referred as STABLERELEASE. - -- BASIC - -The BASIC branch is a very minimal one. This branch may get bugfixes and -updates and might get minor improvements. This is a version of yChat -with only very few features. - -A RELEASE of BASIC can be referred as BASICRELEASE. - -- LEGACY - -The LEGACY branch has no real support. This branch may get bugfixes and -updates and might get minor improvements. But there is no garuantee to -be bug free and stable at all. LEGACY versions are of historic meaning. - -- DEVEL - -DEVEL is only a meta name. If a version is labeled with DEVEL, then its -currently undefined if this is a CURRENT, STABLE or LEGACY branch. It -can be everything. Commonly DEVEL versions are CURRENT. - -There are also releases made: - -- RELEASE - -There can be RELEASEs made out of each branch. While a branch can get -new features, a RELEASE can not. A RELEASE of a branch is just like -a snapshot. RELEASEs are complete versions to test and use. But keep -in mind, that a RELEASE of the STABLE branch is recommended over a -RELEASE of a CURRENT or a LEGACY branch in a production environment. -RELEASEs of CURRENT are still the bleeding edge and RELEASEs of LEGACY -may be out of date. - -- Short names - - -In addition, each description also has short names: (short names are needed -if your text space is limited which happens very fast in IRC channel topics) - -CURRENT aka CUR aka C -RELEASE aka REL aka R -LEGACY aka LEG aka L -STABLE aka SBL aka S -BASIC aka BSC aka B -DEVEL aka DEV aka D -PRE aka P - -STABLERELEASE aka STBREL aka SR -PRERELEASE aka PREREL aka PR -PRELEGACYRELEASE aka PRELEGREL aka PLR -etc... - -The short name of the chat is "yC" -The short name of the httpd is "yh" - -- Versioning - -In general, versions are made up like X.Y.Z.W. X specifies the major version, -Y specifies the branch of the major version, Z specifies a sub revision -of a specific branch. The optional W can be used to specify a maintenance -revision which only changes small issues. - -//<<* -1.2.0 YCHAT FEATURES - -- Its free & portable - -yChat is developed under the GNU general public license and is based on GNU -tools (gcc, gmake), other open source library stuff (such as GNU Readline etc.) -and should run on any POSIX capable operating system (such as all Linux based -systems, FreeBSD, NetBSD, OpenBSD and other BSD-Systems and on UNICES like -IRIX, HP-UX, Solaris etc.). - -- There is no need for special chat clients - -yChat is web based, that means clients may only connect to the chat server -with an normal web browser such as Microsoft Internet Explorer or any Gecko- -Engine powerd browsers like Mozilla, Firefox, Camino etc. - -- It has features of a real HTTP webserver - -yChat runs completely stand alone and does not need another webserver to build -on like Apache and does not need to be run via any kind of CGI. yChat creates -its own socket on a customized port (standard port: 2000) and seems to be a full -featured HTTP web server to the clients (web browsers). - -The yChat code base can be converted to an yhttpd code base automaticaly. yhttpd -is the webserver subset of yChat which runs completely stand alone and provides -normal websites to the net. It also supports Common Gateway Interface (CGI) -scripting. - -- Its fast and secure - -yChat is written in C++ which is faster than any Java based Chat-Server or any -server written in a scripting language like PHP, Python or Perl. As the -internal data structures hash maps are used to garuantee searching certain -values in O(1) amount of time. If a hash maps gets full, it will be rehashed. -Currently, yChat has been measured providing over 1000 hits/requests per second -on a FreeBSD based server box while using less than 2% of CPU usage -on a Athlon XP 1900+. Performance seems to be limited by your bandwith only. -Also, each user gets its own session id (random string) with a standard length -of 50 chars to authenticate each logged in user. The length of the session id -can be redefined as well. Also, the session id will get md5-hashed optionally -so thats even harder to reverse engineering the session ids of other users. -Also, yChat supports secure hypertext transfer protocol (HTTPS) connections -using the OpenSSL library. Then, all chat messages will be encrypted in a -secure manner. HTTPS is optional to HTTP (unsecured connections). - -- Its HTML template based and easy to customize via XML based configuration - -All HTML sites are predefined as HTML-Template files and can be easily modified -to use with an customized web design. Also, a lot of yChat preferences can be -set in the main configuration file (ychat.conf). ychat.conf is completely written -in XML 1.0 which makes it easier to use the configuration options in programs of -3rd persons which may want to write some usefull tools for yChat. -yChat caches all HTML and web images to improve overall performance. If needed, the -cache can be cleared to recache new versions of the template files. - -- Its language template based - -The administrator can easily create a new language in which all system messages -appear to the Chat-User. The predefined languages is english but others can be -added easily. The language can be edited in the XML based configuration file. - -- MySQL based database - -Registered users are stored in a MySQL database. C++ Programmers may feel free -to replace the database wrapper class (data.h) with another database routines -to use other databases such as PostgreSQL, SQLite or a text based database etc. -If wished, you can disable database support in the pre-compile options. - -- It has an administration interface - -yChat includes an libreadline based administration interface which tracks some -interesting statistics and system messages and enables you to do certain -administrative tasks like keeping track of the current system usage etc. -If you dont like libreadline you can disable both options in the pre-compile -options. - -- It has logging capabilities - -The logging manager keeps track to all yChat system messages (such as users -wich log in and out, modules which are loaded, MySQL queries etc.). Also, an -Apache-Style combined log file format is created by yChat (you can parse this -logfile with any Apache logfile parser like awstats etc.). And last but not -least, all public messages of all available rooms will be logged to disk as -well . To improve performance, you can define the logging puffer (standardly -new logs will be written to disk after each 20 lines). If you want to log -everything immediately, you can reset this option to 1 in ychat.conf. - -- Its modular through own command and dynamic HTML engine - -All chat commands are realized through dynamic loadable module files which can -be recompiled and reloaded without restarting the whole yChat server. Also -HTML-Sites with certain tasks can be compiled as a module like -mods/html/yc_register.so, mods/html/yc_options.so and mods/html/yc_colors.so -etc. so you can also program your dynamic yChat websites in C++. - -- Its multi threaded (POSIX threads) - -There is only one main process which spawns several threads, each for its own -unique task. For example one thread is used to handle the servers's events. -(see libevent) Another thread is used to control the libreadline based -administration command line interface. - -- Its event driven (libevent) - -yChat is event driven. Non-blocking sockets are used to serve the client -requests. In contrast do a multi-threaded based client handling, this approach -is more effective on single processor systems and there is no complex mutex -structure inside of the code which leads to much cleaner and easier code -design. The libevent controls all read/write operations of the server and also -does handle signal and timer events. The timer events prove if clients are still -active and frees not needed memory in certain time intervals (see also "Garbage -collector") and does some other continuous tasks. - -- Its using a smart garbage collection engine - -All users and rooms which dont have to be kept in the main memory (because the -user has logged out or the room has been destroyed because it was empty) will -not be deleted immediately but be placed for about 10 minutes in the yChat -garbage collector. Each time a new room is created the systems checks the -garbage to reuse an inactive room object. If a certain user wants to log in, the -system checks if he is already present in the garbage collector. If yes, he will -be reactivated without wasting expensive database queries to fetch the user's -options. This improves overall performance on heavily loaded yChat servers if a -lot of user and room objects are created and destroyed frequently. -//*>> - -2.0.0 INSTALLATION AND SETUP - -2.1.0 REQUIREMENTS: - -- GNU GCC G++ - The GNU C++ compiler version 4.2.1 or up. - -- GNU make 3.80 (gmake) or higher - If you dont have a gmake executable but make is gnu make then you need - to add a symlink or alias from gmake to make. - yChat Makefiles only have been tested with GNU make and may not work with - other make versions. - -- SGI STL extension - Includes ext/hash_map which may be already default on every Linux distro. - On *BSD you have to install it first before compiling. On FreeBSD - /usr/ports/devel/stlport is your friend. - -- OpenSSL (optional) - Includes libssl and the ssl header files of the open source SSL library. - OpenSSL is only needed if you chose to compile yChat w/OpenSSL support. - -- GNU Readline (optional) - This library can be used with the command line interface (CLI) of - ychat to make the editing easier. - -//<<* -- mysql-client 4.x (optional) [3.x may do too but is not supported] - Includes libmysqlclient and the mysql.h header files. mysql-client is only - needed if you chose to compile yChat w/database support. -//*>> - -- Screen (optional) - Only needed if yChat should run in background with - the CLI enabled. - -- Perl 5.x - Is needed for some scripts. Is not needed if you use precompiled binaries. - -2.2.0 TESTED PLATFORMS: - -The following platforms have been tested with success. If you find out that -a listed platform did not work at all please contact me: - - Operating system (arch) GNU G++ GNU make -- FreeBSD 7.0-BETA2 (i386) 4.2.1 3.81 - - Tested longer time before: -- FreeBSD 6.2-RELEASE (amd64) 3.4.6 3.81 -- FreeBSD 6.0-RELEASE (i386) 3.4.4 3.80 -- FreeBSD 5.3-RELEASE (i386) 3.4.2 3.80 -- FreeBSD 5.4-RELEASE (i386) 3.4.2 3.80 -- FreeBSD 4.10-RELEASE (i386) 3.4.1 3.80 -- Gentoo Linux 2004 (i386) 3.3.2 3.80 -- OpenBSD 3.6 SMP (i386) 3.3.2 3.80 -- Red Hat Linux 8.0 SMP (i386) 3.2-7 3.79 -- Slackware Linux 10.0 (i386) 3.4.0 3.80 -- SUSE Linux 9.0 (i386) 3.3.1 3.80 -- SUSE Linux 8.1 (i386) 3.2 3.79.1 - -Other platforms like Linux based systems, other BSD-Systems or UNICES -are very likely to work too. - -2.3.0 HOW TO OBTAIN YCHAT: - -For SVN download type: - -svn co --username=anon http://svn.buetow.org/repos/ychat/trunk - -Now you may continue with the installation. - -There are different branches in the CVS: - -ychat: This is the latest CURRENT branch of yChat. -ychat-stable: This is the latest STABLE branch of yChat. -ychat-X.Y: This is the branch with the specified version prefix. -yhttpd: This is the latest CURRENT snapshot of yhttpd. - -The CURRENT branch of ychat is mostly untested and unstable, so don't -cry if you get errors. - -2.4.0 INSTALLATION QUICK START - -If you in hury, then you may just run the following commands: - - sh -c 'CXXFLAGS="" ./configure' - gmake install clean - -yChat will get compiled without debugging symbols and its default values. -Afterwards yChat will get installed into the default prefix which is -/usr/local. Afterwards it is ready to run with the '/usr/local/bin/ychat' -command! - -2.4.1 INSTALLATION - -If you wanna quick start, then please refer to section 2.4.0 instead. - -Invoke './configure --help'. Afterwards you will get prompted with all the -possible compile options. Take a closer look at the --enable-FEATURE and the ---disable-FEATURE options. Afterwards run configure with your wanted options. -Now, you can run 'gmake'. See below what gmake is doing. By default yChat uses -loosy debugging symbols. To disable them, then run configure this way: - - sh -c 'CXXFLAGS="" ./configure --options' - -Dont forget to replace --options with your desired values. You can read more -about debugging symbols in section '4.1.0 WRITING BUG REPORTS'. - -//<<* -If you have choosen MySQL database support, then take a look at section 1.3.2 -how to setup a valid database table. Be also sure to enter the valid MySQL -accessing data in the yChat configuration file which is normally located in -the etc/ychat.conf file. -//*>> - -You may also invoke gmake with the following options: - - gmake or gmake all (compiles everything, also modules and runs "gmake mail") - gmake base (only compiles the base) - gmake base_start (only compiles the base and starts the server) - gmake build (increments the current build number by one) - gmake clean (cleans everything) - gmake clean_base (only cleans the base obj and rpo files) - gmake clean_modules (only cleans the modules .so files) - gmake confdebug (runs the configure with strong debugging symboles enabled) - gmake debug (runs gdb on ./ychat.core) - gmake deinstall (same as gmake uninstall) - gmake dist (creates a .tar.bz2 ball) - gmake headers (rewrites the source file headers using doc/header.txt) - gmake help (shows all available yChat gmake targets) - gmake install (removes debugging symbols and installs yChat into the PREFIX) - gmake license (shows the GNU General Public License) - gmake modules (only compiles modules) - gmake mrproper (same as gmake clean plus removing all temp files) - gmake quick (runs all configure scripts and afterwards gmake all) - gmake replace (replace in the source the content of $FROM into $INTO) - gmake stats (generates yChat statistics) - gmake strip (removes debugging symbols from binary) - gmake ssltest (generates a self signed ssl test certificate) - gmake touch (resets the date of each file in the source tree) - gmake uninstall (uninstalls yChat from the current default PREFIX) - gmake version (shows the current version of yChat) -//<<* - gmake yhttpdbase (generates an yhttpd code base) -//*>> (See section 1.9 to read about this marks) - -Example: 'gmake all install clean' compiles everything, installs it to PREFIX -and cleans the source directories. - -Now its time to run the server with './bin/ychat'. - -Aferwards point your webbrowser to http://yourip:port ! - -... have fun :-). - -2.5.0 HOW TO USE OPENSSL WITH YCHAT - -If you chose to use OpenSSL support you have to have a valid SSL private and -public key. If you are in hurry, use the gmake ssltest command from the top -source tree directory and follow the instructions. Otherwise type the -following commands manually: - -The private key can be created w/the following command: - - openssl genrsa -des3 -out privkey.pem 2048 - -Afterwards, you can create a self-signed test certificate using the following -command: - - openssl req -new -x509 -key privkey.pem -out cert.pem -days 1095 - -Be sure to move the privkey.pem and cert.pem files into the ./etc directory -or edit the path names in the ./etc/ychat.conf file. yChat wont start if there -are no valid files found. - -To learn more about SSL certificates, visit http://www.openssl.org/docs/HOWTO/. - -Now use https:// and NOT http:// to connect to the yChat server. - -2.5.1 HOW TO USE SCREEN WITH YCHAT: - -If you are running yChat in CLI mode you might want to install -the tool which is called "screen". This will enable you putting the -CLI interface into the background, closing the terminal session -and reusing the interface later through another terminal. - -Just do: - - screen -S ychat ./bin/ychat ( creates a new session and starts yChat in it ) - ctrl+d+a ( will detach the yChat session ) - ( closing the terminal ) - ( opening a new terminal ) - screen -r ychat ( will return you to the yChat process ) - -Screen will terminate automaticaly if all processes in its sessions are -terminated. - -For a closer look read the screen manual page ( man screen ). - -2.5.2 HOW TO USE SIGNALS WITH YCHAT: - -You can send UNIX signals to yChat. This becomes very interesting if you -don't use the command line interface and you don't have access to the options -below. - -Run one of the following commands to send the signal you want: -($PID is here the process id of the current yChat process) - -kill -USR1 $PID # yChat clears the HTML template cache -kill -USR2 $PID # yChat reloads all dynamic loadable modules //<< -kill -HUP $PID # yChat will shutdown savely - -2.5.3 HOW TO USE GNU READLINE WITH YCHAT: - -This library can be used with the command line interface (CLI) of ychat. To -use it, yChat has to be compiled with readline support (which is the default -setting). - -Readline offers editing capabilities while the user is entering the line. -By default, the line editing commands are similar to those of emacs. A vi-style -line editing interface is also available. - -For configuration and usage of the yChat readline CLI prompt, read the readline -manpage. :) - -//<<* -2.5.4 HOW TO USE MYSQL WITH YCHAT - -If you chose to use MySQL database support you have to create a valid database -to use with yChat. - -Create a new MySQL database called 'ychat' and type the following command into -a MySQL command line client of your choice: - -USE ychat -CREATE TABLE `user` ( - `uid` int(10) NOT NULL auto_increment, - `nick` varchar(30) NOT NULL default '', - `password` varchar(30) NOT NULL default '', - `color1` varchar(30), - `color2` varchar(30), - `email` varchar(50) default '-', - `registerdate` varchar(30) default '-', - `logincounter` varchar(10) default '0', - `status` char(1) default '3', - PRIMARY KEY (`uid`), - KEY `uid` (`uid`) -) TYPE=MyISAM; -GRANT ALL PRIVILEGES ON ychat.* to ychat@localhost IDENTIFIED BY "yctest"; - -This database uses the default MySQL access informations which are stored in the -ychat.conf file. -//*>> - -2.6.0 CUSTOMIZING YCHAT: - -If you like to customize the design/layout/language of yChat, you will have -to edit ./src/msgs.h and ./src/glob.h before you compile the sources. Afterwards -you can change the html-template files which are placed in the ./html/ -subdirectory and the language-templates which are placed in the XML config -file (etc/ychat.conf). - -Notice, that you dont have to edit the ./src/glob.h file by hand any more, its -already done by the top ./configure script for you (See './configure --help'). - -You can edit the ./etc/ychat.conf to fit your needs. If you dont want to change -the config file, then you also can use ychat start parameters. - -Exmpl: ./bin/ychat -o chat.database.password secretpassword - -You can also use multiple words for a specific option. - -Exmpl: ./bin/ychat -o ychat.version "word1 word2 word3" - -will overwrite the default database password value of the ychat.conf. You can -do this with every configuration element by adding several -o option value -arguments to the start command. - -Dynamic loadable modules can be found in the ./mods/ subdirectory. (chat -commands are realized through modules too). Sources of modules can be found -in ./src/mods instead. If you want to create a new module just create a new -.cpp file and run in ./src/mods the ./configure script again. Next time -you run 'gmake' or 'gmake modules' your new module gets compiled. - -All messages defined in the ./src/msgs.h file contain server messages only (a chat -user never wont read them, only the administrator will get to see them). - -Read also section 3.0.0 of this README. - -//<<* -2.7.0 YHTTPD CODE BASE GENERATION - -See docs/yhttpd.txt -//*>> - -3.0.0 EXTENDING YCHAT - -3.1.0 SOURCE FILES - -This list is not complete. Only the most important files are listed here! - -./etc/ychat.conf - The yChat configuration file -./html/* - The html template files -./src/* - The yChat base sources -./src/mods/* - The dynamic loadable modules sources -./scripts/* - Some nice scripts needed for building & co. - -The following is created by building yChat: -./obj/* - The object files of the compiled yChat base -./mods/* - The compiled dynamic loadable modules -./bin/ychat - The yChat binary (linked by the object files) -./bin/ychat.bak - An yChat binary of a previous build process - -Customizable source files (if changed you need to run gmake clean all) -./src/glob.h - Contains some global building options -./src/msgs.h - Defines some server side messages - - -4.0.0 DIVERSE - -4.1.0 WRITING BUG REPORTS - -How to submit a good bug report? - -Send them to Mail at yChat dot org. - -First you should give the following information: -- yChat version, if CVS (or devel. tarball) then which day? -- operating system / distribution and it's version -- when did it crash? did you do something? can you reproduce the crash? - -Getting backtrace of the crash also helps a lot, especially if yChat crashes -randomly. If after crash you see text: - - "segmentation fault (core dumped)" - -It writes a file named 'core' or 'ychat.core' depending on your OS to directory -where you started yChat. If it doesn't print the '(core dumped)' or you can't -find the core file, you'll have to raise the limit for max. core file size -before running yChat. To do this, say: - - ulimit -c unlimited - -So, if you have the core file and GNU debugger (gdb), you can get the -backtrace with: - - gdb ./bin/ychat ychat.core (or gmake debug instead) - bt - -Paste all the lines starting from line having #0 at the beginning. - -Here's an example session: - - in reqp::parse(thrd*, std::string, std::map<std::string, std::string, - std::less<std::string>, std::allocator<std::pair<std::string const, std::string> > >&) () - (gdb) bt - #0 0x0805c287 in reqp::parse(thrd*, std::string, std::map<std::string, - std::string, std::less<std::string>, std::allocator<std::pair<std::string - const, std::string> > >&) () - #1 0x0806060f in sock::read_write(thrd*, int) () - #2 0x080612ba in thrd::run() () - #3 0x0805a3b8 in pool::run_func(void*) () - #4 0x0805a375 in pool::tpool_thread(void*) () - #5 0x281d44ae in _thread_start () from /usr/lib/libc_r.so.5 - (gdb) - -If you dont get such a gdb output, you need to recompile the yChat using -debuggig symbols. You can do it this way: - - gmake clean_base base run - -By default, ychat gets compiled with loosy debugging symbols. If you want to -get strong debugging symbols, then type: - - gmake confdebug clean_base base run - -or if you didnt run a ./configure before, then type: - - sh -c 'CXXFLAGS="-g3 -ggdb" ./configure'; gmake clean_base base run - -instead. - -In order to remove all the debugging symbols, then just type 'gmake strip' -afterwards. If you use 'gmake install', then the binary will be stripped -automatically. - -If you dont wanna compile with debugging symbols by default, then use this -command: - - sh -c 'CXXFLAGS="" ./configure'; gmake clean_base base run - -4.2.0 CONTACT ADDRESSES - -You may contact us through the following addresses: - -- Homepage - The yChat homepage is located at http://ychat.buetow.org - -- E-Mail - ychat at dev.buetow.org - -- IRC - #coding at irc.german-elite.net - -4.2.0 CREDITS - -Thanks to the following persons. Without them yChat would not be like today: - -- Volker Richter <volker at exa-ds dot de> of EXA Digital Solutions GbR - for adding initial MySQL support and lots of more code. - -- Joshua Teitelbaum <joshuat at cryptomail.org> of CryptpMail.org for adding - initial OpenSSL support and lots of security patches in the HTTP header - handling. - -- Ralf Huesing <ralf at stormbind (net)> for his nice rhttpd webserver which - served as a nice libevent sample program! And also for his help mails - concerning libevent! - -- Dave K. (http://maligree.yi.org) for the nice JavaScript color selection - menu! |