Step 5: Install ClamAV eCAP Adapter

Checking downloaded files for viruses will be implemented using eCAP ClamAV adapter by Measurement Factory, see http://www.e-cap.org/downloads. To download and compile all required packages, navigate to core.debian10 sub folder and run script 05_clamav.sh .

#!/bin/bash

# all packages are installed as root
if [[ $EUID -ne 0 ]]; then
   echo "This script must be run as root" 1>&2
   exit 1
fi

# install clamav
apt-get install -y clamav clamav-daemon libclamav-dev

# from now on every error is fatal
set -e

# download the sources
wget http://www.e-cap.org/archive/ecap_clamav_adapter-2.0.0.tar.gz

# unpack
tar -xvzf ecap_clamav_adapter-2.0.0.tar.gz

# patch the CL_SCAN_STDOPT error
patch ecap_clamav_adapter-2.0.0/src/ClamAv.cc < ClamAv.cc.patch

# and RPI compilation
patch ecap_clamav_adapter-2.0.0/src/Xaction.cc < Xaction.cc.patch

# change into working dir
pushd ecap_clamav_adapter-2.0.0

# build
./configure && make && make install

# revert back
popd

The following patch fixes CL_SCAN_STDOPT error, as indicated on https://bugs.launchpad.net/ecap/+bug/1813962

--- ClamAv.cc   2015-11-08 13:07:35.000000000 -0500
+++ ClamAv.cc.new   2019-07-29 08:34:21.000000000 -0400
@@ -44,8 +44,13 @@
     // We assume that cl_*() functions used here are threadsafe.

     const char *virname = 0;
-    const int eScanResult = cl_scanfile(answer.fileName.c_str(), &virname, 0, engine, CL_SCAN_STDOPT);

+    static struct cl_scan_options options = {};
+    {
+        options.parse |= ~0; // enable all parsers
+    }
+    const int eScanResult = cl_scanfile(answer.fileName.c_str(), &virname, 0, engine, &options);
+
     switch (eScanResult) {
     case CL_CLEAN:
         answer.statusCode = Answer::scClean;

And the next patch fixes the error when compiling eCAP adapter on Raspberry PI as explained at https://launchpadlibrarian.net/359347434/min-deduction-v2p0p0.patch

--- Xaction.cc.original 2020-04-13 10:35:15.231335505 +0100
+++ Xaction.cc  2020-04-13 10:36:13.841324633 +0100
@@ -302,7 +302,7 @@
         // We are here because we are or were trickling. If we stopped trickling,
         // we should not give more than we had trickled (until the final action).
         const Size tricklingMax = (trickledSize > pos) ? trickledSize - pos : 0;
-        bufSize = std::min(bufSize, tricklingMax);
+        bufSize = std::min(static_cast<Size>(bufSize), tricklingMax);
         // fall through to also obey actAllow limits
     }

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