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<H3><A NAME="SECTION00074100000000000000">
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Data scan functions</A>
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</H3>
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It's possible to scan a file or descriptor using:
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<PRE>
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int cl_scanfile(const char *filename, const char **virname,
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unsigned long int *scanned, const struct cl_engine *engine,
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const struct cl_limits *limits, unsigned int options);
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int cl_scandesc(int desc, const char **virname, unsigned
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long int *scanned, const struct cl_engine *engine, const
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struct cl_limits *limits, unsigned int options);
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</PRE>
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Both functions will save a virus name under the pointer <code>virname</code>,
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the virus name is part of the engine structure and must not be released
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directly. If the third argument (<code>scanned</code>) is not NULL, the
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functions will increase its value with the size of scanned data (in
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<code>CL_COUNT_PRECISION</code> units). Both functions have support for archive
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limits in order to protect against Denial of Service attacks.
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<PRE>
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struct cl_limits {
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unsigned int maxreclevel; /* maximum recursion level for archives */
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unsigned int maxfiles; /* maximum number of files to be scanned
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* within a single archive
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*/
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unsigned int maxmailrec; /* maximum recursion level for mail files */
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unsigned int maxratio; /* maximum compression ratio */
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unsigned long int maxfilesize;/* compressed files larger than this limit
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* will not be scanned
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*/
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unsigned short archivememlim; /* limit memory usage for some unpackers */
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};
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</PRE>
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The last argument (<code>options</code>) configures the scan engine and supports
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the following flags (that can be combined using bit operators):
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<UL>
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<LI><B>CL_SCAN_STDOPT</B>
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<BR>
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This is an alias for a recommended set of scan options. You
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should use it to make your software ready for new features
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in the future versions of libclamav.
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</LI>
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<LI><B>CL_SCAN_RAW</B>
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<BR>
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Use it alone if you want to disable support for special files.
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</LI>
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<LI><B>CL_SCAN_ARCHIVE</B>
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<BR>
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This flag enables transparent scanning of various archive formats.
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</LI>
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<LI><B>CL_SCAN_BLOCKENCRYPTED</B>
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<BR>
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With this flag the library will mark encrypted archives as viruses
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(Encrypted.Zip, Encrypted.RAR).
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</LI>
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<LI><B>CL_SCAN_BLOCKMAX</B>
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<BR>
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Mark archives as viruses if <code>maxfiles</code>, <code>maxfilesize</code>,
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or <code>maxreclevel</code> limit is reached.
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</LI>
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<LI><B>CL_SCAN_MAIL</B>
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<BR>
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Enable support for mail files.
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</LI>
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<LI><B>CL_SCAN_MAILURL</B>
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<BR>
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The mail scanner will download and scan URLs listed in a mail
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body. This flag should not be used on loaded servers. Due to
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potential problems please do not enable it by default but make
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it optional.
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</LI>
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<LI><B>CL_SCAN_OLE2</B>
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<BR>
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Enables support for OLE2 containers (used by MS Office and .msi
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files).
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</LI>
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<LI><B>CL_SCAN_PDF</B>
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<BR>
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Enables scanning within PDF files.
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</LI>
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<LI><B>CL_SCAN_PE</B>
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<BR>
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This flag enables deep scanning of Portable Executable files and
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allows libclamav to unpack executables compressed with run-time
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unpackers.
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</LI>
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<LI><B>CL_SCAN_ELF</B>
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<BR>
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Enable support for ELF files.
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</LI>
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<LI><B>CL_SCAN_BLOCKBROKEN</B>
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<BR>
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libclamav will try to detect broken executables and mark them as
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Broken.Executable.
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</LI>
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<LI><B>CL_SCAN_HTML</B>
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<BR>
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This flag enables HTML normalisation (including ScrEnc
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decryption).
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</LI>
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<LI><B>CL_SCAN_ALGORITHMIC</B>
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<BR>
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Enable algorithmic detection of viruses.
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</LI>
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<LI><B>CL_SCAN_PHISHING_DOMAINLIST</B>
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<BR>
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Phishing module: restrict URL scanning to domains from .pdf
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(RECOMMENDED).
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</LI>
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<LI><B>CL_SCAN_PHISHING_BLOCKSSL</B>
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<BR>
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Phishing module: always block SSL mismatches in URLs.
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</LI>
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<LI><B>CL_SCAN_PHISHING_BLOCKCLOAK</B>
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<BR>
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Phishing module: always block cloaked URLs.
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</LI>
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</UL>
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All functions return 0 (<code>CL_CLEAN</code>) when the file seems clean,
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<code>CL_VIRUS</code> when a virus is detected and another value on failure.
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<PRE>
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...
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struct cl_limits limits;
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const char *virname;
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memset(&limits, 0, sizeof(struct cl_limits));
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limits.maxfiles = 1000; /* max files */
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limits.maxfilesize = 10 * 1048576; /* maximum size of archived or
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* compressed file (files exceeding
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* this limit will be ignored)
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*/
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limits.maxreclevel = 5; /* maximum recursion level for archives */
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limits.maxmailrec = 64; /* maximum recursion level for mail files */
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limits.maxratio = 200; /* maximum compression ratio */
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if((ret = cl_scanfile("/tmp/test.exe", &virname, NULL, engine,
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&limits, CL_STDOPT)) == CL_VIRUS) {
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printf("Virus detected: %s\n", virname);
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} else {
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printf("No virus detected.\n");
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if(ret != CL_CLEAN)
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printf("Error: %s\n", cl_strerror(ret));
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}
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</PRE>
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Tomasz Kojm
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2007-12-12
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