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<H3><A NAME="SECTION00073800000000000000">
Data scan functions</A> |
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It's possible to scan a file or descriptor using:
<PRE>
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);
</PRE>
Both functions will store a virus name under the pointer <code>virname</code>,
the virus name is part of the engine structure and must not be released
directly. If the third argument (<code>scanned</code>) is not NULL, the
functions will increase its value with the size of scanned data (in
<code>CL_COUNT_PRECISION</code> units).
The last argument (<code>options</code>) specified the scan options and supports
the following flags (which can be combined using bit operators):
<UL>
<LI><SPAN CLASS="textbf">CL_SCAN_STDOPT</SPAN>
<BR>
This is an alias 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.
</LI>
<LI><SPAN CLASS="textbf">CL_SCAN_RAW</SPAN>
<BR>
Use it alone if you want to disable support for special files.
</LI>
<LI><SPAN CLASS="textbf">CL_SCAN_ARCHIVE</SPAN>
<BR>
This flag enables transparent scanning of various archive formats.
</LI>
<LI><SPAN CLASS="textbf">CL_SCAN_BLOCKENCRYPTED</SPAN>
<BR>
With this flag the library will mark encrypted archives as viruses
(Encrypted.Zip, Encrypted.RAR).
</LI>
<LI><SPAN CLASS="textbf">CL_SCAN_MAIL</SPAN>
<BR>
Enable support for mail files.
</LI>
<LI><SPAN CLASS="textbf">CL_SCAN_OLE2</SPAN>
<BR>
Enables support for OLE2 containers (used by MS Office and .msi
files).
</LI>
<LI><SPAN CLASS="textbf">CL_SCAN_PDF</SPAN>
<BR>
Enables scanning within PDF files.
</LI>
<LI><SPAN CLASS="textbf">CL_SCAN_PE</SPAN>
<BR>
This flag enables deep scanning of Portable Executable files and
allows libclamav to unpack executables compressed with run-time
unpackers.
</LI>
<LI><SPAN CLASS="textbf">CL_SCAN_ELF</SPAN>
<BR>
Enable support for ELF files.
</LI>
<LI><SPAN CLASS="textbf">CL_SCAN_BLOCKBROKEN</SPAN>
<BR>
libclamav will try to detect broken executables and mark them as
Broken.Executable.
</LI>
<LI><SPAN CLASS="textbf">CL_SCAN_HTML</SPAN>
<BR>
This flag enables HTML normalisation (including ScrEnc
decryption).
</LI>
<LI><SPAN CLASS="textbf">CL_SCAN_ALGORITHMIC</SPAN>
<BR>
Enable algorithmic detection of viruses.
</LI>
<LI><SPAN CLASS="textbf">CL_SCAN_PHISHING_BLOCKSSL</SPAN>
<BR>
Phishing module: always block SSL mismatches in URLs.
</LI>
<LI><SPAN CLASS="textbf">CL_SCAN_PHISHING_BLOCKCLOAK</SPAN>
<BR>
Phishing module: always block cloaked URLs.
</LI>
<LI><SPAN CLASS="textbf">CL_SCAN_STRUCTURED</SPAN>
<BR>
Enable the DLP module which scans for credit card and SSN
numbers.
</LI>
<LI><SPAN CLASS="textbf">CL_SCAN_STRUCTURED_SSN_NORMAL</SPAN>
<BR>
Search for SSNs formatted as xx-yy-zzzz.
</LI>
<LI><SPAN CLASS="textbf">CL_SCAN_STRUCTURED_SSN_STRIPPED</SPAN>
<BR>
Search for SSNs formatted as xxyyzzzz.
</LI>
<LI><SPAN CLASS="textbf">CL_SCAN_PARTIAL_MESSAGE</SPAN>
<BR>
Scan RFC1341 messages split over many emails. You will need to
periodically clean up <code>$TemporaryDirectory/clamav-partial</code>
directory.
</LI>
<LI><SPAN CLASS="textbf">CL_SCAN_HEURISTIC_PRECEDENCE</SPAN>
<BR>
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. Recommended, saves CPU
scan-time. When disabled, virus/phish detected by heuristic 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. |
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</LI>
<LI><SPAN CLASS="textbf">CL_SCAN_BLOCKMACROS</SPAN>
<BR>
OLE2 containers, which contain VBA macros will be marked infected
(Heuristics.OLE2.ContainsMacros). |
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</LI>
</UL>
All functions return <code>CL_CLEAN</code> when the file seems clean,
<code>CL_VIRUS</code> when a virus is detected and another value on failure.
<PRE>
...
const char *virname;
if((ret = cl_scanfile("/tmp/test.exe", &virname, NULL, engine, |
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CL_SCAN_STDOPT)) == CL_VIRUS) { |
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printf("Virus detected: %s\n", virname);
} else {
printf("No virus detected.\n");
if(ret != CL_CLEAN)
printf("Error: %s\n", cl_strerror(ret));
}
</PRE> |
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