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):
- CL_SCAN_STDOPT
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.
- CL_SCAN_RAW
Use it alone if you want to disable support for special files.
- CL_SCAN_ARCHIVE
This flag enables transparent scanning of various archive formats.
- CL_SCAN_BLOCKENCRYPTED
With this flag the library will mark encrypted archives as viruses
(Encrypted.Zip, Encrypted.RAR).
- CL_SCAN_MAIL
Enable support for mail files.
- CL_SCAN_MAILURL
The mail scanner will download and scan URLs listed in a mail
body. This flag should not be used on loaded servers. Due to
potential problems please do not enable it by default but make
it optional.
- CL_SCAN_OLE2
Enables support for OLE2 containers (used by MS Office and .msi
files).
- CL_SCAN_PDF
Enables scanning within PDF files.
- CL_SCAN_PE
This flag enables deep scanning of Portable Executable files and
allows libclamav to unpack executables compressed with run-time
unpackers.
- CL_SCAN_ELF
Enable support for ELF files.
- CL_SCAN_BLOCKBROKEN
libclamav will try to detect broken executables and mark them as
Broken.Executable.
- CL_SCAN_HTML
This flag enables HTML normalisation (including ScrEnc
decryption).
- CL_SCAN_ALGORITHMIC
Enable algorithmic detection of viruses.
- CL_SCAN_PHISHING_BLOCKSSL
Phishing module: always block SSL mismatches in URLs.
- CL_SCAN_PHISHING_BLOCKCLOAK
Phishing module: always block cloaked URLs.
- CL_SCAN_STRUCTURED
Enable the DLP module which scans for credit card and SSN
numbers.
- CL_SCAN_STRUCTURED_SSN_NORMAL
Search for SSNs formatted as xx-yy-zzzz.
- CL_SCAN_STRUCTURED_SSN_STRIPPED
Search for SSNs formatted as xxyyzzzz.
- CL_SCAN_PARTIAL_MESSAGE
Scan RFC1341 messages split over many emails. You will need to
periodically clean up $TemporaryDirectory/clamav-partial
directory.
- 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. 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.
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", &virname, NULL, engine,
CL_STDOPT)) == CL_VIRUS) {
printf("Virus detected: %s\n", virname);
} else {
printf("No virus detected.\n");
if(ret != CL_CLEAN)
printf("Error: %s\n", cl_strerror(ret));
}
Tomasz Kojm
2009-06-10