Clam AntiVirus 0.96.5 User Manual
Contents
1. e Nicklaus Wicker e David Williams http kayakero net e Glenn R Williams e Kelly Williams e XRoads Networks http xroadsnetworks com e Zimbra open source collaboration suite http www zimbra com 6 7 Graphics The ClamAV logo was created by Mia Kalenius and Sergei Pronin from Finndesign http www finndesign fi 6 8 OpenAntiVirus Our database includes the virus database about 7000 signatures from OpenAntiVirus http OpenAntiVirus org 7 Core Team e aCaB acab clamav net Italy Role virus database maintainer coder e Mike Cathey mike clamav net USA Role co sysadmin e Christoph Cordes ccordes clamav net Germany Role virus database maintainer e Diego d Ambra diego clamav net Denmark Role virus database maintainer e Luca Gibelli 1uca clamav net Italy Role sysadmin mirror coordinator Core Team Nigel Horne lt njh clamav net gt United Kingdom Role coder Arnaud Jacques lt arnaud clamav net gt France Role virus database maintainer Tomasz Kojm lt tkojm clamav net gt Poland Role project leader coder Tomasz Papszun lt tomek clamav net gt Poland Role various help Sven Strickroth lt sven clamav net gt Germany Role virus database maintainer virus submission management Edwin Torok lt edwin clamav net gt Romania Role coder Trog lt trog clamav net gt United Kingdom Role coder2. Clam AntiVirus 0 96 5 User Manual Contents Contents Introduction lil Features s Au Ee doe be ba Fed Fed BSS 6 Se RSS oe 1 2 Mailing lists and IRC channel 1 3 Virus submiinne uo vom aa o RO cR AAA Base package 2 1 Supported platforms eh see daa ad 2L UNIX 2 og aed demi a eed do e Hae Ee 49 ook eo aS 2 1 2 Wandows ita a qr A eo i9 eiu Ros 2 2 Binary packages c ode qoot dun dus P WERL REOR WC eR Installation m Beguiremenis sus xg chord eR EH eh Ped ex 3 2 Installing on shell account 3 3 Adding new system user and group 3 4 Compilation of base package 5 45045 445 04 dee y 3 5 Compilation with clamav milter enabled 3 6 Running unit tests a doe ROS 3 7 Reporting a unit test failure bug Configuration SEH clamd 2222942442443 935 10 e GS 4 1 1 On access scanning 42 Elamav M S A 4 6 5 4 000 000 ra L9 E 9 at Yo x Yep X Yes Eno usarse Ea A eee CS ee 44 Setting up auto updating 4 41 Closestmirors ou qoe ope A e A ES 4 5 ClamAV Active Malware Report Usage SL Clam daemon er ses 344 4 oa Oe eh aS Se SEES SESE SS 32 lamuseBH 4 364265 2465 24454 4 5646 024 E ob A 9 0 o e ou dee et Saeed eee FSH P Sepe s 2b MME ow dios doe Bow erben SOLI leng ide a a AR RA A ER ER o A Ei re HEEN Contents 6 LibClamAV
3. e Matt Butt mattb cre8tiv com e Christopher X Candreva chris westnet com e Eric I Lopez Carreon lt elopezc technitrade com gt e Ales Casar lt casar uni mb si gt e Jonathan Chen lt jon clamav spock org gt e Andrey Cherezov andrey cherezov koenig su e Alex Cherney lt alex cher id au gt e Tom G Christensen tgc statsbiblioteket dk e Nicholas Chua lt nicholas ncmbox net gt e Chris Conn lt cconn abacom com gt e Christoph Cordes lt ib precompiled de gt e Ole Craig lt olc cs umass edu gt e Eugene Crosser crosser rol ru e Calin A Culianu lt calin ajvar org gt e Damien Curtain lt damien pagefault org gt e Krisztian Czako lt slapic linux co hu gt e Diego d Ambra lt da softcom dk e Michael Dankov lt misha btrc ru gt e Yuri Dario lt mc6530 mclink it gt e David lt djgardner users sourceforge net gt e Maxim Dounin lt mdounin rambler co ru gt e Alejandro Dubrovsky lt s328940 student uq edu au gt LibClamAV e James P Dugal lt jpd louisiana edu gt e Magnus Ekdahl lt magnus debian org gt e Mehmet Ekiz lt ekizm tbmm gov tr gt e Jens Elkner lt elkner linofee org gt e Fred van Engen lt fred wooha org gt e Jason Englander lt jason englanders cc gt e Oden Eriksson lt oeriksson mandrakesoft com gt e Daniel Fahlgren lt fahlgren ardendo se gt e Andy Fiddaman lt af jeamland org gt e Edison Figueira Junior lt edison brc com br gt e David Ford lt david cert
4. OA Licence won 6d ee Ba a KE HR EO 3x cx 6 2 Supported formats and features 6 2 1 xecuiables 2 oo sac px X oxco O34 Se Yo ala O22 Mall DS s sig 64 daria Edo X er a el 6 23 Archives and compressed files 024 Documents d aca ae ee o Se oe a ES 6 23 Data Loss Prevention 5 2 45 44 Aa da A9 x RR XC O 2O OMES MEE LTD 03 APL ge e ux we RR ee ee oe ee Pe NUES E X NE pal Header tle Qa aeg oe tardara meds RR 6 3 2 tert PC 6 3 3 Database loading 0 3 4 Errorhandling 22 0 2 2 2022 4 23 50 esasta A 635 Engine str t te secs so aoro ro p havens ELS OO LIMIS lt lt wed tar Su doi d i hk Bee Ge Be HG E 3 6 37 Database checks wu 22g de ER OSE DES EM eh 6 3 5 Data scan TuliCHOBS e 644444 hp 4 a A He ge HESS 67 Memory 2344244345 0355 90 595 54 ood 53 6 3 10 Forking daemons 6 5 11 Clamav ConDE s os 2e 1o x 209 se ein 0 3 12 Example lt a Pale eee Xe e Sa Ces ee 0 CVD format ns a ook bre Se eh ewe oe ES Oa EE 2 Sag 6444 oe au Sw EEE EEE EY 5 Oc DIODOS o as ee Be ES ae oe SAN be Ex GO Graphite duck ug doe dee RE CAO EGE X oue Be A en E 6 8 OpenAntiVirus eRe X E RR A 7 Core Team 19 20 20 20 20 20 2l 21 22 22 22 22 22 24 24 24 25 26 28 28 28 29 29 29 40 46 46 46 Contents ES ClamAV User Manual 2007 2010 Sourcefire Inc Authors Tomasz Kojm This document is distributed under th
5. and use clamdscan or instead connect directly to its socket and run the SCAN command clamdscan 1 scan txt clamav x yz Please note that the scanned files must be accessible by the user running clamd or you will get an error 4 4 Setting up auto updating freshclam is the automatic database update tool for Clam AntiVirus It can work in two modes e interactive on demand from command line e daemon silently in the background freshclam is advanced tool it supports scripted updates instead of transferring the whole CVD file at each update it only transfers the differences between the latest and the current database via a special script database version checks through DNS proxy servers with authentication digital signatures and various error scenarios Quick test run freshclam as superuser with no parameters and check the output If every thing is OK you may create the log file in var log owned by clamav or another user freshclam will be running as touch var log freshclam log chmod 600 var log freshclam log chown clamav var log freshclam log Now you should edit the configuration file freshclam conf and point the UpdateLog File directive to the log file Finally to run freshclam in the daemon mode execute freshclam d The other way is to use the cron daemon You have to add the following line to the crontab of root or clamav user N usr local bin freshclam quiet To get more inf
6. co uk gt e Jo Mills lt Jonathan Mills frequentis com gt e Dustin Mollo lt dustin mollo sonoma edu gt e Remi Mommsen lt remigius mommsen cern ch gt e Doug Monroe doug planetconnect com e Alex S Moore lt asmoore edge net gt e Tim Morgan lt tim sentinelchicken org gt e Dirk Mueller lt mueller kde org gt e Flinn Mueller lt flinn activeintra net gt e Hendrik Muhs lt Hendrik Muhs student uni magdeburg de gt e Simon Munton lt simon munton demon co uk gt e Farit Nabiullin http program farit ru e Nemosoft Um lt nemosoft smcc demon n1 gt e Wojciech Noworyta lt wnow konarski edu pl gt e Jorgen Norgaard lt jnp anneli dk gt e Fajar A Nugraha lt fajar telkom co id gt e Joe Oaks lt joe oaks hp com gt e Washington Odhiambo lt wash wananchi com gt e Masaki Ogawa lt proc mac com gt LibClamAV e John Ogness lt jogness antivir de gt e Phil Oleson lt oz nixil net gt e Jan Ondrej lt ondrejj salstar sk gt e Martijn van Oosterhout lt kleptog svana org gt e OpenAntiVirus Team http www OpenAntiVirus org e Tomasz Papszun lt tomek lodz tpsa pl gt e Eric Parsonage lt eric eparsonage com gt e Oliver Paukstadt lt pstadt stud fh heilbronn de gt e Christian Pelissier lt Christian Pelissier onera fr gt e Rudolph Pereira lt rudolph usyd edu au gt e Dennis Peterson lt dennispe inetnw com gt e Ed Phillips lt ed UDel Edu gt e Andreas Piesk lt Andreas Piesk heise de g
7. configur nable check should tell you why 3 7 Reporting a unit test failure bug If make check says that some tests failed we encourage you to report a bug on our bugzilla http bugs clamav net The information we need is see also http clamav net bugs e The exact output from make check 4 Configuration KO e Output of uname mrsp e your config log e The following files from the unit_tests directory test log clamscan log clamdscan log e tmp clamd test 1log if it exists e where and how you installed the check package e Output of pkg config check cflags libs e Optionally if valgrindis available on your platform the output of the following make check CK FORK no libtool mode execute valgrind unit tests check clamav 4 Configuration 4 1 clamd Before you start using the daemon you have to edit the configuration file in other case clamd won t run clamd ERROR Please edit the example config file etc clamd conf This shows the location of the default configuration file The format and options of this file are fully described in the clamd conf 5 manual The config file is well commented and configuration should be straightforward 4 1 1 On access scanning One of the interesting features of clamd is on access scanning based on the Dazuko module available from http dazuko org This module is not required to run clamd furthermore you shouldn t run Dazuko on production s
8. e Joerg Sonnenberger joerg britannica bec de e Michal GiM Spadlinski http gim org pl e Kevin Spicer lt kevin kevinspicer co uk gt e GertJan Spoelman lt cav gjs cc gt e Ole Stanstrup lt ole stanstrup dk gt e Adam Stein lt adam scan mc xerox com gt LibClamAV e Steve lt steveb webtribe net gt e Richard Stevenson lt richard endace com gt e Sven Strickroth lt sstrickroth gym oha de gt e Matt Sullivan lt matt sullivan gen nz gt e Dr Zbigniew Szewczak zssz mat uni torun pl e Joe Talbott lt josepht cstone net gt e Gernot Tenchio lt g tenchio telco tech de gt e Masahiro Teramoto lt markun onohara to gt e Daniel Theodoro lt dtheodoro ig com br gt e Ryan Thompson lt clamav sasknow com gt e Gianluigi Tiesi lt sherpya netfarm it gt e Yar Tikhiy lt yar comp chem msu su gt e Andrew Toller lt atoller connectfree co uk gt e Michael L Torrie lt torriem chem byu edu gt e Trashware trashware gmx net e Matthew Trent mt rent localaccess com e Reini Urban lt rurban x ray at gt e Daniel Mario Vega lt dv5a dc uba ar gt e Denis Vlasenko lt vda ilport com ua gt e Laurent Wacrenier lwa teaser fr e Charlie Watts lt cewatts brainstorminternet net gt e Florian Weimer lt fw deneb enyo de gt e Paul Welsh lt paul welshfamily com gt e Nicklaus Wicker n wicker cnk networks de e David Woakes lt david mitredata co uk gt 6 LibClamAV 6 6 Troy Wollensl
9. sources allocated by the engine use cl engine free Function prototypes int cl init unsigned int options struct cl engine cl engine new void int cl engine free struct cl engine engine cl init and cl engine free return CL SUCCESS on success or another code on error cl engine new return a pointer or NULL if there s not enough memory to allocate a new engine structure 6 3 3 Database loading The following set of functions provides an interface for loading the virus database 6 LibClamAV const char cl_retdbdir void int cl_load const char path struct cl_engine engine cl_retdbdir returns the default hardcoded path to the directory with ClamAV databases cl load loads a single database file or all databases from a given di rectory when path points to a directory The second argument is used for passing in the pointer to the engine that should be previously allocated with cl_engine_new A number of loaded signatures will be added to signo The last argument can pass the unsigned int signo unsigned int options following flags CL_DB_STDOPT This is an alias for a recommended set of scan options CL_DB_PHISHING Load phishing signatures CL_DB_PHISHING_URLS Initialize the phishing detection module and load wdb and pdb files CL_DB_PUA Load signatures for Potentially Unwanted Applications CL DB OFFICIAL ONLY Only load official signatures from digitally signed
10. strings using the following set of functions 6 LibClamAV EJ int cl engine set num struct cl engine engine enum cl engine field field long long num long long cl engine get num const struct cl engine engine enum cl engine field field int err int cl engine set str struct cl engine engine enum cl engine field field const char str const char cl engine get str const struct cl engine engine enum cl engine field field int err Please don t modify the default values unless you know what you re doing Refer to the ClamAV sources clamscan clamd for examples 6 3 7 Database checks It s very important to keep the internal instance of the database up to date You can watch database changes with the cl stat family of functions int cl statinidir const char dirname struct cl stat dbstat int cl statchkdir const struct cl stat dbstat int cl statfree struct cl stat dbstat Initialization struct cl stat dbstat memset amp dbstat 0 sizeof struct cl stat cl statinidir dbdir amp dbstat To check for a change you just need to call cl statchkdir and check its return value 0 no change 1 some change occured Remember to reset the c1 stat structure after reloading the database if cl statchkdir amp dbstat 1 reload database cl statfree amp dbstat cl statinidir cl retdbdir amp dbstat 6 LibClamAV EJ Libclamav gt 0 9
11. 6 includes and additional call to check the number of signatures that can be loaded from a given directory int cl countsigs const char path unsigned int countoptions unsigned int sigs The first argument points to the database directory the second one specifies what signa tures should be counted CL COUNTSIGS OFFICIAL official signatures CL COUNTSIGS UNOFFICIAL third party signatures CL COUNTSIGS ALL all signa tures The last argument points to the counter to which the number of detected signa tures will be added therefore the counter should be initially set to 0 The call returns CL SUCCESS or an error code 6 3 8 Data scan functions It s possible to scan a file or descriptor using int cl scanfile const char filename const char virname unsigned long int scanned const struct cl engine engine unsigned int options int cl scandesc int desc const char virname unsigned long int scanned const struct cl engine engine unsigned int options Both functions will store a virus name under the pointer virname the virus name is part of the engine structure and must not be released directly If the third argument scanned is not NULL the functions will increase its value with the size of scanned data in CL COUNT PRECISION units The last argument options specified the scan options and supports the following flags which can be combined using bit operators e CL SCAN STDOPT This is an al
12. PPED Search for SSNs formatted as xxyyzzzz 6 LibClamAV EJ e CL SCAN PARTIAL MESSAGE Scan RFC1341 messages split over many emails You will need to periodically clean up TemporaryDirectory clamav partial directory e CL SCAN HEURISTIC PRECEDENCE Allow heuristic match to take precedence When enabled if a heuristic scan such as phishingScan detects a possible virus phish it will stop scan immediately Rec ommended saves CPU scan time When disabled virus phish detected by heuris tic scans will be reported only at the end of a scan If an archive contains both a heuristically detected virus phishing and a real malware the real malware will be reported All functions return CL CLEAN when the file seems clean CL VIRUS when a virus is detected and another value on failure const char virname if ret cl scanfile tmp test exe amp virname NULL engine CL STDOPT CL VIRUS printf Virus detected s n virname else printf No virus detected Mn if ret CL CLEAN printf Error s n cl strerror ret 6 3 9 Memory Because the engine structure occupies a few megabytes of system memory you should release it with cl engine free if you no longer need to scan files 6 3 10 Forking daemons If you re using libclamav with a forking daemon you should call srand inside a forked child before making any calls to the libclamav functions This will avoid possi ble collisions with temporary filenames crea
13. acro viruses mobile malware and other threats e Built in bytecode interpreter allows the ClamAV signature writers to create and distribute very complex detection routines and remotely enhance the scanner s functionality e Scans within archives and compressed files also protects against archive bombs built in support includes Zip including SFX RAR including SFX 7Zip ARJ including SFX Tar CPIO Gzip Bzip2 MS OLE2 MS Cabinet Files including SFX MS CHM Compiled HTML 1 Introduction S MS SZDD compression format BinHex SIS SymbianOS packages Autolt InstallShield e Supports Portable Executable 32 64 bit files compressed or obfuscated with AsPack UPX FSG Petite PeSpin NsPack wwpack32 MEW Upack YOda Cryptor e Supports ELF and Mach O files both 32 and 64 bit e Supports almost all mail file formats e Support for other special files formats includes HTML RTF PDF Files encrypted with CryptFF and ScrEnc uuencode TNEF winmail dat e Advanced database updater with support for scripted updates digital signatures and DNS based database version queries 2 Base package EJ 1 2 Mailing lists and IRC channel If you have a trouble installing or using ClamAV try asking on our mailing lists There are four lists available e clamav announce lists clamav net info about new versions moderated e
14. anos Chatziathanassiou e Cheahch from Singapore e Conexim Australia business web hosting http www conexim com au e Alan Cook e Joe Cooper e CustomLogic LLC http www customlogic com e Ron DeFulio e Digirati http oss digirati com br e Steve Donegan http www donegan org e Dynamic Network Services Inc http www dyndns org e EAS Enterprises LLC e eCoupons com http www ecoupons com e Electric Embers http electricembers net e John T Ellis LibClamAV e Epublica e Bernhard Erdmann e David Eriksson http www 2good nu e Philip Ershler e Explido Software USA Inc http www explido us e David Farrick e Jim Feldman e Petr Ferschmann http petr ferschmann cz e Andries Filmer http www netexpo nl e The Free Shopping Cart people http www precisionweb net e Paul Freeman e Jack Fung e Stephen Gageby e Paolo Galeazzi e GANDI http www gandi net e Jeremy Garcia http www linuxquestions org e GBC Internet Service Center GmbH http www gbc net e GCS Tech http www gcstech net e GHRS http www ghrshotels com e Lyle Giese e Todd Goodman e Bill Gradwohl http www ycc com e Grain of Salt Consulting e Terje Gravvold e Hart Computer http www hart co jp LibClamAV e Pen Helm e Hosting Metro LLC http www hostingmetro com e IDEAL Software GmbH http www IdealSoftware com e Industry Standard Computers
15. av make make install To test your installation execute clamav bin freshclam clamav bin clamscan The disable clamav switch disables the check for existence of the clamav user and group but clamscan would still require an unprivileged account to work in a superuser mode 3 3 Adding new system user and group If you are installing ClamAV for the first time you have to add a new user and group to your system groupadd clamav useradd g clamav s bin false c Clam AntiVirus clamav Consult a system manual if your OS has not groupadd and useradd utilities Don t forget to lock access to the account 3 Installation 9 3 4 Compilation of base package Once you have created the clamav user and group please extract the archive zcat clamav x yz tar gz tar xvf cd clamav x yz Assuming you want to install the configuration files in etc configure and build the software as follows configure sysconfdir etc make su c make install In the last step the software is installed into the usr local directory and the config files into etc WARNING Never enable the SUID or SGID bits for Clam AntiVirus binaries 3 5 Compilation with clamav milter enabled libmilter and its development files are required To enable clamav milter configure ClamAV with configur nable milter 3 6 Running unit tests ClamAV includes unit tests that allow you to test that the compiled binaries
16. blue labs org gt e Martin Forssen lt maf appgate com gt e Brian J France lt list firehawksystems com gt e Free Oscar lt freeoscar wp pl gt e Martin Fuxa lt yeti email cz gt e Piotr Gackiewicz lt gacek intertele pl gt e Jeremy Garcia lt jeremy linuxquestions org gt e Dean Gaudet lt dean clamav arctic org gt e Michel Gaudet lt Michel Gaudet ehess fr gt e Philippe Gay lt ph gay free fr gt e Nick Gazaloff lt nick sbin org gt e Geoff Gibbs lt ggibbs hgmp mrc ac uk gt e Luca NERvOus Gibelli lt nervous nervous it gt e Scott Gifford lt sgifford suspectclass com gt e Wieslaw Glod lt wkg x2 pl gt LibClamAV e Stephen Gran lt steve lobefin net gt e Koryn Grant lt koryn endace com gt e Matthew A Grant lt grantma anathoth gen nz gt e Christophe Grenier lt grenier cgsecurity org gt e Marek Gutkowski lt hobbit core segfault pl gt e Jason Haar lt Jason Haar trimble co nz gt e Hrvoje Habjanic lt hrvoje habjanic zg hinet hr gt e Michal Hajduczenia lt michalis mat uni torun pl gt e Jean Christophe Heger lt jcheger acytec com gt e Martin Heinz lt Martin hemag ch gt e Kevin Heneveld lt kevin northstar k12 ak us gt e Anders Herbjornsen lt andersh gar no gt e Paul Hoadley lt paulh logixsquad net gt e Robert Hogan lt robert roberthogan net gt e Przemyslaw Holowczyc doozer skc com pl e Thomas W Holt Jr lt twh cohesive net gt e James F Hranicky lt jfh cise ufl edu
17. clamav users lists clamav net user questions e clamav devel lists clamav net technical discussions e clamav virusdb lists clamav net database update announcements moderated You can subscribe and search the mailing list archives at http www clamav net support ml Alternatively you can try asking on the clamav IRC channel launch your favourite irc client and type server irc freenode net join clamav 1 3 Virus submitting If you have got a virus which is not detected by your ClamAV with the latest databases please submit the sample at our website http www clamav net sendvirus 2 Base package 2 1 Supported platforms 2 1 1 UNIX The most popular UNIX operating systems are supported Clam AntiVirus 0 9x is reg ularly tested on e GNU Linux e Solaris e FreeBSD Subscribers are not allowed to post to the mailing list 3 Installation e OpenBSD e MacOS X 2 1 2 Windows Starting with 0 96 ClamAV builds natively under Visual Studio 2 20 Binary packages You can find the up to date list of binary packages at our website http www clamav net download packages 3 Installation 3 1 Requirements The following components are required to compile ClamAV under UNIX e zlib and zlib devel packages e gcc compiler suite tested with 2 9x 3 x and 4 x series If you are compiling with higher optimization levels than the default one O2 for gcc be aware that there have been reports of mi
18. cluding clamd will not be able to detect any viruses In the result all infected mails may be delivered For example to protect the whole system add the following lines to clamd conf lamukoScanOnAccess lamukoIncludePath lamukoExcludePath proc lamukoExcludePath temporary dir of your mail scanning software C3 CH CX C2 You can also use clamuko to protect files on Samba Netatalk but a far more better and safe idea is to use the samba vscan module NFS is not supported because Dazuko doesn t intercept NFS access calls 5 4 Output format 5 4 1 clamscan clamscan writes all regular program messages to stdout and errors warnings to stderr You can use the option stdout to redirect all program messages to stdout Warnings and error messages from 1ibclamav are always printed to stderr A typical output from clamscan looks like this tmp test removal tool exe Worm Sober FOUND tmp test md5 o OK tmp test blob c OK 6 LibClamAV 19 tmp test message c OK tmp test error hta VBS Inor D FOUND When a virus is found its name is printed between the filename and FOUND strings In case of archives the scanner depends on libclamav and only prints the first virus found within an archive zolw localhost tmp clamscan malware zip malware zip Worm Mydoom U FOUND 5 4 2 clamd The output format of clamd is very similar to clamscan zolw localhost telnet localhost 3310 Trying 127 0 0 1 Con
19. com de gt e Peter N Lewis lt peter stairways com au gt LibClamAV Matt Leyda lt mfleyda e one com gt James Lick lt jlick drivel com gt Jerome Limozin lt jerome limozin net gt Mike Loewen lt mloewen sturgeon cac psu edu gt Roger Lucas lt roger planbit co uk gt David Luyer lt david_luyer pacific net au gt Richard Lyons lt frob clamav webcentral com au gt David S Madole lt david madole net gt Thomas Madsen lt tm softcom dk Bill Maidment lt bi11 maidment com au gt Joe Maimon lt jmaimon ttec com gt David Majorel lt dm lagoon nc gt Andrey V Malyshev lt amal krasn ru gt Fukuda Manabu lt fukuda cri mw co jp gt Stefan Martig lt sm officeco ch gt Alexander Marx lt mad ml madness at gt Andreas Marx http www av test org Chris Masters lt cmasters insl co uk gt Fletcher Mattox lt fletcher cs utexas edu gt Serhiy V Matveyev lt matveyev uatele com gt Reinhard Max lt max suse de gt Brian May lt bam debian org gt Ken McKittrick k1mac usadatanet com Chris van Meerendonk cvm castel nl Andrey J Melnikoff lt temnota kmv ru gt LibClamAV e Damian Menscher lt menscher uiuc edu gt e Denis De Messemacker lt ddm clamav net gt e Jasper Metselaar lt jasper formmailer net gt e Arkadiusz Miskiewicz lt misiek pld linux org gt e Ted Mittelstaedt lt tedm toybox placo com gt e Mark Mielke lt mark mark mielke cc gt e John Miller lt contact glideslopesoftware
20. databases CL DB BYTECODE Load bytecode cl load returns CL SUCCESS on success and another code on failure struct cl engine engine unsigned int sigs 0 int ret if ret cl_init CL SUCCESS printf cl init error s n cl strerror ret return 1 ORemember to initialize the virus counter variable with 0 6 LibClamAV 24 if engine cl engine new printf Can t create new engine n return 1 ret cl_load cl_retdbdir engine amp sigs CL_DB_STDOPT 6 3 4 Error handling Use cl_strerror to convert error codes into human readable messages The func tion returns a statically allocated string if ret CL SUCCESS printf cl load error s n cl strerror ret cl engine free engine return 1 6 3 5 Engine structure When all required databases are loaded you should prepare the detection engine by calling cl engine compile In case of failure you should still free the memory allocated to the engine with c1 engine free int cl engine compile struct cl engine engine In our example if ret cl engine compile engine CL SUCCESS printf cl engine compile error s n cl strerror ret cl engine free engine return 1 6 3 6 Limits When you create a new engine with c1 engine new it will have all internal settings set to default values as recommended by the ClamAV authors It s possible to check and modify the values numerical and
21. e Paul Rantin e Thomas J Raef http www ebasedsecurity com e Luke Reeves http www neuro tech net e RHX http www rhx it e Stefano Rizzetto e Roaring Penguin Software Inc http www roaringpenguin com e Luke Rosenthal e Jenny Sfstrm http PokerListings com LibClamAV EJ e School of Engineering University of Pennsylvania http www seas upenn edu e Tim Scoff e Seattle Server http www seattleserver com e Software Workshop Inc http www softwareworkshop com e Solutions In A Box http www siab com au e Stephane Rault e SearchMain http www searchmain com e Olivier Silber e Fernando Augusto Medeiros Silva http www linuxplace com br e Sollentuna Fria Gymnasium Sweden http www sfg se e StarBand http www starband com e Stroke of Color Inc e Synchro Sistemas de Informacao http synchro com br e Sahil Tandon e The Spamex Disposable Email Address Service http www spamex com e Brad Tarver e TGT Tampermeier amp Grill Steuerberatungs und Wirtschaftstreuhand OEG http www tgt at e Per Reedtz Thomsen e William Tisdale e Up Time Technology http www uptimetech com e Ulfi e Jeremy Vanderburg http www jeremytech com e Web arbyte Online Marketing http www webarbyte de 7 Core Team ES e Webzone Srl http www webzone it e Markus Welsch http www linux corner net e Julia White http www convert tools com
22. e terms of the GNU General Public License v2 Clam AntiVirus 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 51 Franklin Street Fifth Floor Boston MA 02110 1301 USA ClamAV and Clam AntiVirus are trademarks of Sourcefire Inc 1 Introduction E 1 Introduction Clam AntiVirus is an open source GPL anti virus toolkit for UNIX designed espe cially for e mail scanning on mail gateways It provides a number of utilities including a flexible and scalable multi threaded daemon a command line scanner and advanced tool for automatic database updates The core of the package is an anti virus engine available in a form of shared library 1 1 Features e Licensed under the GNU General Public License Version 2 e POSIX compliant portable e Fast scanning e Supports on access scanning Linux and FreeBSD only e Detects over 850 000 viruses worms and trojans including Microsoft Office m
23. egel lt t roy intranet org gt ST Wong lt st wong cuhk edu hk gt Dale Woolridge lt dwoolridge drh net gt David Wu lt dyw iohk com gt Takumi Yamane lt yamtak b session com gt Youza Youzovic lt youza post cz gt Anton Yuzhaninov lt citrin rambler co ru gt Leonid Zeitlin lt 1z europe com gt ZMan Z lt x86zman go a way dyndns org gt Andoni Zubimendi lt andoni lpsat net gt Donors We ve received financial support from in alphabetical order Activelntra net Inc http www activeintra net Advance Healthcare Group http www ahgl com au Allied Quotes http www AlliedQuotes com American Computer amp Electronic Services Corp http www acesnw com Amnesty International Swiss Section http www amnesty ch Steve Anderson Anonymous donor from Colorado US Arudius http arudius sourceforge net Peter Ashman Atlas College http www atlascollege nl Australian Payday Cash Loans http www cashdoctors com au AWD Online http www awdonline com LibClamAV EN e BackupAssist Backup Software http www backupassist com e Dave Baker e Bear and Bear Consulting Inc http www bear consulting com e Aaron Begley e Craig H Block e Norman E Brake Jr e Josh Burstyn e By Design http www by design net e Canadian Web Hosting http www canadianwebhosting com e cedarcreeksoftware com http www cedarcreeksoftware com e Ricardo Cerqueira e Th
24. gt e Douglas J Hunley lt doug hunley homeip net gt e Kurt Huwig lt kurt iku netz de gt e Andy Igoshin lt ai vsu ru gt e Michal Jaegermann lt michal harddata com gt e Christophe Jaillet lt christophe jaillet wanadoo fr gt e Jay lt sysop clamav coronastreet net gt e Stephane Jeannenot lt stephane jeannenot wanadoo fr e Per Jessen lt per computer org gt LibClamAV e Dave Jones lt dave kalkbay co za gt e Jesper Juhl lt juhl dif dk gt e Kamil Kaczkowski lt kamil kamil eisp pl gt e Alex Kah lt alex narfonix com gt e Stefan Kaltenbrunner lt stefan kaltenbrunner cc gt e Lloyd Kamara lt 1 kamara imperial ac uk gt e Stefan Kanthak lt stefan kanthak fujitsu siemens com gt e Kazuhiko lt kazuhiko fdiary net gt e Jeremy Kitchen lt kitchen scriptkitchen com gt e Tomasz Klim lt tomek euroneto pl gt e Robbert Kouprie robbert exx nl e Martin Kraft martin kraft fal de e Petr Kristof Kristof P fce vutbr cz e Henk Kuipers lt henk opensourcesolutions nl gt e Nigel Kukard nkukard lbsd net e Eugene Kurmanin lt smfs users sourceforge net gt e Dr Andrzej Kurpiel akurpiel mat uni torun pl e Mark Kushinsky mark mdspc com e Mike Lambert lt lambert jeol com gt e Thomas Lamy Thomas Lamy in online net gt e Stephane Leclerc sleclerc aliastec net e Marty Lee lt marty maui co uk gt e Dennis Leeuw dleeuw made it com e Martin Lesser lt admin debian better
25. http www ISCnetwork com e Interact2Day http www interact2day com e Invisik Corporation http www invisik com e itXcel Internet Domain Registration http www itxcel com e Craig Jackson e Stuart Jones e Jason Judge e Keith http www textpad com e Ewald Kicker http www very clever com e Brad Koehn e Christina Kuratli http www virusprotect ch e Logic Partners Inc http www logicpartners com e Mark Lotspaih http www lotcom org e Michel Machado http oss digirati com br e Olivier Marechal e Matthew McKenzie e Durval Menezes http www durval com br e Micro Logic Systems http www mls nc e Midcoast Internet Solutions e Mimecast http www mimecast com e Kazuhiro Miyaji e Bozidar Mladenovic LibClamAV e Paul Morgan e Tomas Morkus e The Names Database http static namesdatabase com e Names Directory http www namesdir com e Michael Nolan http www michaelnolan co uk e Jorgen Norgaard e Numedeon Inc creators of Whyville http www whyville net e Oneworkspace com http www oneworkspace com e Online Literature http www couol com e Origin Solutions http www originsolutions com au e outermedia GmbH http www outermedia de e Kevin Pang http www freebsdblog org e Alexander Panzhin e Passageway Communications http www passageway com e Dan Pelleg http www libagent org e Thodoris Pitikaris
26. ias for a recommended set of scan options You should use it to make your software ready for new features in the future versions of libclamav e CLSCAN RAW Use it alone if you want to disable support for special files e CL SCAN ARCHIVE This flag enables transparent scanning of various archive formats LibClamAV e CL_SCAN_BLOCKENCRYPTED With this flag the library will mark encrypted archives as viruses Encrypted Zip Encrypted RAR e CL SCAN MAIL Enable support for mail files e CL SCAN OLE2 Enables support for OLE2 containers used by MS Office and msi files e CL SCAN PDF Enables scanning within PDF files e CL SCAN PE This flag enables deep scanning of Portable Executable files and allows libclamav to unpack executables compressed with run time unpackers e CL SCAN ELF Enable support for ELF files e CL SCAN BLOCKBROKEN libclamav will try to detect broken executables and mark them as Broken Executable e CL SCAN HTML This flag enables HTML normalisation including ScrEnc decryption e CL SCAN ALGORITHMIC Enable algorithmic detection of viruses e CL SCAN PHISHING BLOCKSSL Phishing module always block SSL mismatches in URLs e CL SCAN PHISHING BLOCKCLOAK Phishing module always block cloaked URLs e CL SCAN STRUCTURED Enable the DLP module which scans for credit card and SSN numbers e CL SCAN STRUCTURED SSN NORMAL Search for SSNs formatted as xx yy zzzz e CL SCAN STRUCTURED SSN STRI
27. lies it sent before sending more commands to prevent send deadlocks The recommended way to implement a client that uses IDSESSION is with non blocking sockets and a select poll loop whenever send would block sleep in select poll until either you can write more data or read more replies Note that us ing non blocking sockets without the select poll loop and alternating recv send doesn t comply with clamd s requirements If clamd detects that a client has dead locked it will close the connection Note that clamd may close an IDSESSION connection too if the client doesn t follow the protocol s requirements e STREAM deprecated use INSTREAM instead Scan stream clamd will return a new port number you should connect to and send data to scan It s recommended to prefix clamd commands with the letter z eg zSCAN to indi cate that the command will be delimited by a NULL character and that clamd should continue reading command data until a NULL character is read The null delimiter as sures that the complete command and its entire argument will be processed as a single command Alternatively commands may be prefixed with the letter n e g nSCAN to use a newline character as the delimiter Clamd replies will honour the requested terminator in turn If clamd doesn t recognize the command or the command doesn t follow the requirements specified below it will reply with an error message and close the connection Clamd ca
28. limit exceeded and close the connection e FILDES It is mandatory to newline terminate this command or prefix with n or z This command only works on UNIX domain sockets Scan a file descriptor After issuing a FILDES command a subsequent rfc2292 bsd4 4 style packet with at least one dummy character is sent to clamd carrying the file descriptor to be scanned inside the ancillary data Alternatively the file descriptor may be sent in the same packet including the extra character e STATS It is mandatory to newline terminate this command or prefix with n or z it is recommended to only use the z prefix On this command clamd provides statistics about the scan queue contents of scan queue and memory usage The exact reply format is subject to changes in future releases e IDSESSION END It is mandatory to prefix this command with n or z also all commands inside ID SESSION must be prefixed Start end a clamd session Within a session multiple SCAN INSTREAM FILDES VERSION STATS commands can be sent on the same socket without opening new connections Replies from clamd will be in the form id response where id is the request number in ASCII starting from 1 and response is the usual clamd reply The reply lines have the same delimiter as the corre sponding command had Clamd will process the commands asynchronously and 5 Usage reply as soon as it has finished processing Clamd requires clients to read all the rep
29. mail file format including TNEF winmail dat at tachments 6 2 3 Archives and compressed files The following archive and compression formats are supported by internal handlers e Zip SFX e RAR SEX 6 LibClamAV EE e 7Zip e Tar e CPIO e Gzip e Bzip2 e MS OLE2 e MS Cabinet Files SFX e MS CHM Compiled HTML e MS SZDD compression format e BinHex e SIS SymbianOS packages e Autolt e NSIS e InstallShield 6 2 4 Documents The most popular file formats are supported e MS Office and MacOffice files e RTF e PDF e HTML In the case of Office RTF and PDF files libclamav will only extract the embedded objects and will not decode the text data itself The text decoding and normalization is only performed for HTML files 6 2 5 Data Loss Prevention Libclamav includes a DLP module which can detect credit card and social security numbers inside text files 6 LibClamAV 22 6 2 6 Others Libclamav can handle various obfuscators encoders files vulnerable to security risks such as e JPEG exploit detection e RIFF exploit detection e uuencode ScrEnc obfuscation CryptFF 6 3 API 6 3 1 Header file Every program using libclamav must include the header file clamav h include lt clamav h gt 6 3 2 Initialization Before using libclamav you should call cl_init to initialize it When it s done you re ready to create a new scan engine by calling cl engine new To free re
30. md recognizes the following commands e PING Check the daemon s state should reply with PONG e VERSION Print program and database versions e RELOAD Reload the databases e SHUTDOWN Perform a clean exit e SCAN file directory Scan file or directory recursively with archive support enabled a full path is required e RAWSCAN file directory Scan file or directory recursively with archive and special file support disabled a full path is required man 5 clamd conf Usage 16 e CONTSCAN file directory Scan file or directory recursively with archive support enabled and don t stop the scanning when a virus is found e MULTISCAN file directory Scan file in a standard way or scan directory recursively using multiple threads to make the scanning faster on SMP machines e INSTREAM It is mandatory to prefix this command with n or z Scan a stream of data The stream is sent to clamd in chunks after INSTREAM on the same socket on which the command was sent This avoids the overhead of establishing new TCP connections and problems with NAT The format of the chunk is lt length gt lt data gt where length is the size of the following data in bytes expressed as a 4 byte unsigned integer in network byte order and data is the actual chunk Streaming is terminated by sending a zero length chunk Note do not exceed StreamMaxLength as defined in clamd conf otherwise clamd will reply with INSTREAM size
31. n handle the following signals e SIGTERM perform a clean exit e SIGHUP reopen the log file e SIGUSR2 reload the database Clamd should not be started in the background using the shell operator amp or external tools Instead you should run and wait for clamd to load the database and daemonize itself After that clamd is instantly ready to accept connections and perform file scan ning 5 2 Clamdscan clamdscan is a simple clamd client In many cases you can use it as a clamscan replacement however you must remember that e it only depends on clamd e although it accepts the same command line options as clamscan most of them are ignored because they must be enabled directly in clama i e clamd conf 5 Usage 18 e in TCP mode scanned files must be accessible for clamd if you enabled Local Socket in clamd conf then clamdscan will try to workaround this limitation by using FILDES 5 3 Clamuko Clamuko is a special thread in clamd that performs on access scanning under Linux and FreeBSD and shares internal virus database with the daemon You must follow some important rules when using it e Always stop the daemon cleanly using the SHUTDOWN command or the SIGTERM signal In other case you can lose access to protected files until the system is restarted e Never protect the directory your mail scanner software uses for attachment un packing Access to all infected files will be automatically blocked and the scanner in
32. nected to localhost Escape character is SCAN home zolw test home zolw test clam exe ClamAV Test File FOUND Connection closed by foreign host In the SCAN mode it closes the connection when the first virus is found SCAN home zolw test clam zip home zolw test clam zip ClamAV Test File FOUND CONTSCAN and MULTISCAN don t stop scanning in case a virus is found Error messages are printed in the following format SCAN no such file no such file Can t stat the file ERROR 6 LibClamAV Libclamav provides an easy and effective way to add a virus protection into your soft ware The library is thread safe and transparently recognizes and scans within archives mail files MS Office document files executables and other special formats 6 LibClamAV EN 6 1 Licence Libclamav is licensed under the GNU GPL v2 licence This means you are not allowed to link commercial closed source software against it All software using libclamav must be GPL compliant 6 2 Supported formats and features 6 2 1 Executables The library has a built in support for 32 and 64 bit Portable Executable ELF and Mach O files Additionally it can handle PE files compressed or obfuscated with the following tools e Aspack 2 12 e UPX all versions e FSG 1 3 1 31 1 33 2 0 e Petite 2 x e PeSpin 1 1 e NsPack e wwpack32 1 20 e MEW e Upack e YOda Cryptor 1 3 6 2 2 Mail files Libclamav can handle almost every
33. o on clamscan options run man clamscan 4 Configuration 14 to check for a new database every hour N should be a number between 3 and 57 of your choice Please don t choose any multiple of 10 because there are already too many clients using those time slots Proxy settings are only configurable via the configuration file and freshclam will require strict permission settings for the config file when HTTPProxyPassword is tured on PProxyServer myproxyserver com PProxyPort 1234 PProxyUsername myusername Hi Hi Hi RH PProxyPassword mypass 4 4 1 Closest mirrors The DatabaseMirror directive in the config file specifies the database server freshclam will attempt up to MaxAttempts times to download the database from The default database mirror is database clamav net but multiple directives are allowed In or der to download the database from the closest mirror you should configure reshclam to use db xx clamav net where xx represents your country code For example if your server is in Ascension Island you should have the following lines included in freshclam conf DNSDatabaseInfo current cvd clamav net DatabaseMirror db ac clamav net DatabaseMirror database clamav net The second entry acts as a fallback in case the connection to the first mirror fails for some reason The full list of two letters country codes is available at http www iana org cctld cctld whois htm 4 5 ClamAV Active Malware Re
34. port The ClamAV Active Malware Report that was introduced in ClamAV 0 94 1 uses fresh clam to send summary data to our server about the malware that has been detected This data is then used to generate real time reports on active malware These reports along with geographical and historic trends will be published on http www clamav net The more data that we receive from ClamAV users the more reports and the better the quality of the reports will be To enable the submission of data to us for use in the Active Malware Report enable SubmitDetectionStats in freshclam conf and LogTime and LogFile in clamd conf You should only enable this feature if you re running clamd to scan incoming data in your environment 5 Usage 15 The only private data that is transferred is an IP address which is used to create the geographical data The size of the data that is sent is small it contains just the filename malware name and time of detection The data is sent in sets of 10 records up to 50 records per session For example if you have 45 new records then freshclam will submit 40 if 78 then it will submit the latest 50 entries and if you have 9 records no statistics will be sent 5 Usage 5 1 Clam daemon clamd is a multi threaded daemon that uses libclamav to scan files for viruses It may work in one or both modes listening on e Unix local socket e TCP socket The daemon is fully configurable via the clamd conf file cla
35. soptimizations The build system of ClamAV only checks for bugs affecting the default settings it is your responsibility to check that your compiler version doesn t have any bugs The following packages are optional but highly recommended e bzip2 and bzip2 devel library e check unit testing framework The following packages are optional but required for bytecode JIT support e GCC C and C compilers minimum 4 1 3 recommended 4 3 4 or newer the package for these compilers are usually called gcc g or gcc c Installation from a port is recommended 3For Windows instructions please see win32 README in the main source code directory 4See section 3 6 on how to run the unit tests Sif not available ClamAV will fall back to an interpreter Note that several versions of GCC have bugs when compiling LLVM see http 11vm org docs GettingStarted html brokengcc for a full list 3 Installation EJ e A supported CPU for the JIT either of X86 X86 64 PowerPC PowerPC64 The following packages are optional but needed for the JIT unit tests e GNU Make version 3 79 recommended 3 81 e Python version 2 5 4 or newer for running the JIT unit tests 3 2 Installing on shell account To install ClamAV locally on an unprivileged shell account you need not create any additional users or groups Assuming your home directory is home gary you should build it as follows configure prefix home gary clamav disable clam
36. t e Mark Pizzolato lt clamav devel subscriptions pizzolato net gt e Dean Plant lt dean plant roke co uk gt e Alex Pleiner lt pleiner zeitform de gt e Ant La Porte lt ant dvere net gt e Jef Poskanzer jef acme com e Christophe Poujol lt Christophe Poujol atosorigin com gt e Sergei Pronin lt sp finndesign fi gt e Thomas Quinot lt thomas cuivre fr eu org gt e Ed Ravin lt eravin panix com gt e Robert Rebbun robert desertsurf com e Brian A Reiter lt breiter wolfereiter com gt e Didi Rieder lt adrieder sbox tugraz at gt LibClamAV e Pavel V Rochnyack lt rpv fsf tsu ru gt e Rupert Roesler Schmidt lt r roesler schmidt uplink at gt e David Sanchez lt dsanchez veloxia com gt e David Santinoli lt david santinoli com gt e Vijay Sarvepalli lt vssarvep office uncg edu gt e Martin Schitter e Theo Schlossnagle lt jesus omniti com gt e Enrico Scholz lt enrico scholz informatik tu chemnitz de gt e Karina Schwarz lt k schwarz uplink at gt e Scsi lt scsi softland ru gt e Dr Matthew J Seaman lt m seaman infracaninophile co uk gt e Hector M Rulot Segovia lt Hector Rulot uv es gt e Omer Faruk Sen lt ofsen enderunix org gt e Sergey lt a_s_y sama ru gt e Tuomas Silen tuomas silen nodeta fi e David F Skoll lt dfs roaringpenguin com gt e Al Smith lt ajs clamav aeschi ch eu org gt e Sergey Smitienko lt hunter comsys com ua gt e Solar Designer solar openwall com
37. ted by other processes of the daemon This procedure is not required for multi threaded daemons 6 3 11 clamav config Use clamav config to check compilation information for libclamav 6 LibClamAV EJ zolw localhost clamav config libs L usr local lib lz 1bz2 lgmp lpthread zolw localhost clamav config cflags I usr local include g 02 6 3 12 Example You will find an example scanner application in the clamav source package example Provided you have ClamAV already installed execute the following to compile it gcc Wall exl c o exl lclamav 6 4 CVD format CVD ClamAV Virus Database is a digitally signed tarball containing one or more databases The header is a 512 bytes long string with colon separated fields ClamAV VDB build time version number of signatures functionality level required MD5 checksum digital signature builder name build time sec sigtool info displays detailed information on CVD files zolw localhost usr local share clamav sigtool i daily cvd File daily cvd Build time 10 Mar 2008 10 45 0000 Version 6191 Signatures 59084 Functionality level 26 Builder ccordes MD5 6e6e29dae36b4b7315932c921e568330 Digital signature zz9irc9irupR3zT7yX6J4O0R6XdFPUat4HIM9ERn3kACOWpcMFxq Fs4toG5WJsHda0Jj921UusZ 7wAgY jpailNr jFfXHsJxvOdBkS5 XWMnt 30T1ctNgqmiF RLU6VOVeT140ej3Aya0cVpd9KA4XXevEO2eTTvzWNCAq0ZzWNdjc Verifica
38. tion OK 6 5 Contributors The following people contributed to our project in some way providing patches bug reports technical support documentation good ideas LibClamAV e Ian Abbott lt abbotti mev co uk gt e Clint Adams lt schizo debian org gt e Sergey Y Afonin lt asy kraft s ru gt e Robert Allerstorfer lt roal anet at gt e Claudio Alonso lt cfalonso yahoo com gt e Kevin Amorin lt kamorin ccs neu edu gt e Kamil Andrusz lt wizz mniam net gt e Tayfun Asker lt tasker metu edu tr gt e Jean Edouard Babin lt Jeb jeb com fr gt e Marc Baudoin lt babafou babafou eu org gt e Scott Beck lt sbeck gossamer threads com gt e Rolf Eike Beer lt eike mail math uni mannheim de gt e Rene Bellora lt rbellora tecnoaccion com ar gt e Carlo Marcelo Arenas Belon lt carenas sajinet com pe gt e Joseph Benden lt joe thrallingpenguin com gt e Hilko Bengen lt bengen vdst ka inka de gt e Hank Beatty lt hbeatty starband net gt e Alexandre Biancalana lt ale seudns net gt e Patrick Bihan Faou lt patrick mindstep com gt e Martin Blapp lt mb imp ch gt e Dale Blount lt dale velocity net gt e Serge van den Boom svdb stack nl e Oliver Brandmueller lt ob e Gitt NET gt e Boguslaw Brandys brandys o2 pl e Igor Brezac lt igor ipass net gt LibClamAV e Mike Brudenell lt pmb1 york ac uk gt e Brian Bruns lt bruns 2mbit com gt e Len Budney 1budney pobox com
39. work cor rectly on your platform The first step is to use your OS s package manager to install the check package If your OS doesn t have that package you can download it from http check sourceforge net build it and install it To help clamav s configure script locate check it is recommended that you install pkg config preferably using your OS s package manager or from http pkg config freedesktop org The recommended way to run unit tests is the following which ensures you will get an error if unit tests cannot be built The configure script in ClamAV automatically enables the unit tests if it finds the check framework however it doesn t consider it a fatal error if unit tests cannot be enabled 3 Installation 10 configure enable check make make check When make check is finished you should get a message similar to this If a unit test fails you get a message similar to the following See the next section on how to report a bug when a unit test fails 1 of 8 tests failed Please report to http bugs clamav net If unit tests are disabled and you didn t use enable check you will get this mes sage Unit tests disabled in this build Use configure nable check to enable them SKIP check clamav PASS check clamd sh PASS check freshclam sh PASS check sigtool sh PASS check clamscan sh All 4 tests passed 1 tests were not run Running
40. ystems At the moment Dazuko is avaliable for Linux and FreeBSD but the following information only covers Linux 4 Configuration 12 tar zxpvf dazuko a b c tar gz cd dazuko a b c make dazuko or make dazuko smp for smp kernels su insmod dazuko o cp dazuko o lib modules uname r misc depmod a Depending on your Linux distribution you may need to add a dazuko entry to etc modules or run the module during system s startup by adding sbin modprobe dazuko to some startup file You must also create a new device cat proc devices grep dazuko 254 dazuko su c mknod m 600 dev dazuko c 254 0 Now configure Clamuko in clamd conf and read the 5 3 section 4 2 clamav milter ClamAV gt 0 95 includes a new redesigned clamav milter The most notable difference 1s that the internal mode has been dropped and now a working clamd companion is required The second important difference is that now the milter has got its own config uration and log files To compile ClamAV with the clamav milter just run configure enable milter and make as usual Please consult your MTA s manual on how to connect it with the milter 4 3 Testing Try to scan recursively the source directory clamscan r 1 scan txt clamav x yz 4 Configuration 13 It should find some test files in the clamav x yz test directory The scan result will be saved in the scan txt log file 8 To test clama start it
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