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Send byte stream across machine boundaries. // Receive byte stream from beyond machine boundaries. Console.WriteLine(BitConverter.ToString(bytes)); if (BitConverter.IsLittleEndian) Array.Reverse(bytes); Console.WriteLine(BitConverter.ToString(bytes)); int result = BitConverter.ToInt32(bytes, 0); Console.WriteLine("Original value: {0}", value); Console.WriteLine("Returned value: {0}", result); }}// The example displays the following output on a little-endian system:// 4E-61-BC-00// 00-BC-61-4E// 00-BC-61-4E// 4E-61-BC-00// Original value: 12345678// Returned value: 12345678Here is a complete clamav client wrapper written in C# ... #L238-L294htonl is the equivalent for "network-byte-order" in c++ as it seemsYou use either (newline escaped/delimited)or (zero escaped/delimited)workflow:1. send the INSTREAM command: zINSTREAM\0, or nINSTREAM\n2. send (big endian, 4 bytes)3. send the chunk of data corresponding to the above length4. repeat at 2 as long as you have more blocks to send5. send a 0-length block to mark end of stream6. get response CIDR to RegEx: d-fault.nl/cidrtoregexDNS Lookup: d-fault.nl/dnstoolsDKIM Generator: d-fault.nl/dkimgeneratorDNSBL Lookup: d-fault.nl/dnsbllookupGEOIP Lookup: d-fault.nl/geoiplookup SorenR Senior user Posts: 6413 Joined: 2006-08-21 15:38 Location: Denmark Re: BUG: ClamAV 0.104.0 does not work Post by SorenR » 2022-02-10 13:53 RvdH wrote: 2022-02-10 09:36Here is a complete clamav client wrapper written in C# ... #L238-L294htonl is the equivalent for "network-byte-order" in c++ as it seemsYou use either (newline escaped/delimited)or (zero escaped/delimited)workflow:1. send the INSTREAM command: zINSTREAM\0, or nINSTREAM\n2. send (big endian, 4 bytes)3. send the chunk of data corresponding to the above length4. repeat at 2 as long as you have more blocks to send5. send a 0-length block to mark end of stream6. get responseHmm... Something's fishy...ClamAV log:Code: Select allThu Feb 10 12:40:20 2022 -> WARNING: INSTREAM: Size limit reached, (requested: 842019123, max: 26214400)Thu Feb 10 12:40:20 2022 -> WARNING: INSTREAM: Size limit reached, (requested: 842019123, max: 26214400)Code change...Code: Select all VirusScanningResult ClamAVVirusScanner::Scan(const String &hostName, int primaryPort, const String &sFilename) { LOG_DEBUG("Connecting to ClamAV virus scanner..."); int streamPort = 0; TimeoutCalculator calculator; SynchronousConnection commandConnection(calculator.Calculate(IniFileSettings::Instance()->GetClamMinTimeout(), IniFileSettings::Instance()->GetClamMaxTimeout())); if (!commandConnection.Connect(hostName, primaryPort)) { return VirusScanningResult(_T("ClamAVVirusScanner::Scan"), Formatter::Format("Unable to connect to ClamAV server at {0}:{1}.", hostName, primaryPort)); } if (!commandConnection.Write("nINSTREAM\n")) return VirusScanningResult("ClamAVVirusScanner::Scan", "Unable to write STREAM command."); AnsiString readData; // Send the file on the stream socket. File oFile; if (!oFile.Open(sFilename, File::OTReadOnly)) { String sErrorMsg = Formatter::Format("Could not send file {0} via socket since it

--------------------------------------freshclam daemon 1.0.6 (OS: Linux, ARCH: x86_64, CPU: x86_64)ClamAV update process started at Wed Nov 13 22:58:39 2024daily database available for update (local version: 26951, remote version: 27457)WARNING: downloadFile: file not found: downloadPatch: Can't download daily-26952.cdiff from downloadFile: file not found: downloadPatch: Can't download daily-26952.cdiff from downloadFile: file not found: downloadPatch: Can't download daily-26952.cdiff from Incremental update failed, trying to download daily.cvdTesting database: '/opt/zimbra/data/clamav/db/tmp.c6c4bde2c0/clamav-71471ba8e88d7cef2c3289b824b9a580.tmp-daily.cvd' ...Database test passed.daily.cvd updated (version: 27457, sigs: 2067892, f-level: 90, builder: raynman)main.cvd database is up-to-date (version: 62, sigs: 6647427, f-level: 90, builder: sigmgr)bytecode database available for update (local version: 334, remote version: 335)Testing database: '/opt/zimbra/data/clamav/db/tmp.c6c4bde2c0/clamav-186b71904808f37c645f8065a09869ff.tmp-bytecode.cld' ...Database test passed.bytecode.cld updated (version: 335, sigs: 86, f-level: 90, builder: raynman)Clamd successfully notified about the update. GET /daily-26952.cdiff HTTP/2> Host: database.clamav.net> User-Agent: curl/7.61.1> Accept: */*>* TLSv1.3 (IN), TLS handshake, [no content] (0):* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):* TLSv1.3 (IN), TLS app data, [no content] (0):* Connection state changed (MAX_CONCURRENT_STREAMS == 100)!* TLSv1.3 (OUT), TLS app data, [no content] (0):* TLSv1.3 (IN), TLS app data, [no content] (0): Attention Required! | Cloudflarebody{margin:0;padding:0} if (!navigator.cookieEnabled) { window.addEventListener('DOMContentLoaded', function () { var cookieEl = document.getElementById('cookie-alert'); cookieEl.style.display = 'block'; }) } Please enable cookies.* TLSv1.3 (IN), TLS app data, [no content] (0): Sorry, you have been blocked You are unable to access clamav.net Why have I been blocked? This website is using a security service to protect itself from online attacks. The action you just performed triggered the security solution. There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. What can I do to resolve this?* TLSv1.3 (IN), TLS app data, [no content] (0): You can email the site owner to let them know you were blocked. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. Cloudflare Ray ID: 8e22827bda1f94b7 • Your IP: Click to reveal 88.97.91.208 • Performance & security by Cloudflare * TLSv1.3 (IN), TLS app data, [no content] (0): (function(){function d(){var b=a.getElementById("cf-footer-item-ip"),c=a.getElementById("cf-footer-ip-reveal");b&&"classList"in b&&(b.classList.remove("hidden"),c.addEventListener("click",function(){c.classList.add("hidden");a.getElementById("cf-footer-ip").classList.remove("hidden")}))}var a=document;document.addEventListener&&a.addEventListener("DOMContentLoaded",d)})(); window._cf_translation = {};* TLSv1.3 (IN), TLS app data, [no content] (0):* Connection #0 to host database.clamav.net left intact">curl -v Trying 104.16.219.84...* TCP_NODELAY set* Connected to database.clamav.net (104.16.219.84) port 443 (#0)* ALPN, offering h2* ALPN, offering http/1.1* successfully set certificate verify locations:* CAfile: /etc/pki/tls/certs/ca-bundle.crt CApath: none* TLSv1.3 (OUT), TLS handshake, Client hello (1):* TLSv1.3 (IN), TLS handshake, Server hello (2):* TLSv1.3 (IN), TLS handshake, [no content] (0):* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):* TLSv1.3 (IN), TLS handshake, Certificate (11):* TLSv1.3 (IN), TLS handshake, CERT verify (15):* TLSv1.3 (IN), TLS handshake, Finished (20):* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):* TLSv1.3 (OUT), TLS handshake, [no content] (0):* TLSv1.3 (OUT), TLS handshake, Finished (20):* SSL connection using TLSv1.3 / TLS_AES_256_GCM_SHA384* ALPN, server accepted to use h2* Server certificate:* subject: CN=database.clamav.net* start date: Oct 8 10:45:45 2024 GMT* expire date: Jan 6 10:45:44 2025 GMT* subjectAltName: host "database.clamav.net" matched cert's "database.clamav.net"* issuer:

Returned value: 12345678Here is a complete clamav client wrapper written in C# ... #L238-L294htonl is the equivalent for "network-byte-order" in c++ as it seemsYou use either (newline escaped/delimited)or (zero escaped/delimited)workflow:1. send the INSTREAM command: zINSTREAM\0, or nINSTREAM\n2. send (big endian, 4 bytes)3. send the chunk of data corresponding to the above length4. repeat at 2 as long as you have more blocks to send5. send a 0-length block to mark end of stream6. get response CIDR to RegEx: d-fault.nl/cidrtoregexDNS Lookup: d-fault.nl/dnstoolsDKIM Generator: d-fault.nl/dkimgeneratorDNSBL Lookup: d-fault.nl/dnsbllookupGEOIP Lookup: d-fault.nl/geoiplookup SorenR Senior user Posts: 6414 Joined: 2006-08-21 15:38 Location: Denmark Re: BUG: ClamAV 0.104.0 does not work Post by SorenR » 2022-02-10 13:53 RvdH wrote: 2022-02-10 09:36Here is a complete clamav client wrapper written in C# ... #L238-L294htonl is the equivalent for "network-byte-order" in c++ as it seemsYou use either (newline escaped/delimited)or (zero escaped/delimited)workflow:1. send the INSTREAM command: zINSTREAM\0, or nINSTREAM\n2. send (big endian, 4 bytes)3. send the chunk of data corresponding to the above length4. repeat at 2 as long as you have more blocks to send5. send a 0-length block to mark end of stream6. get responseHmm... Something's fishy...ClamAV log:Code: Select allThu Feb 10 12:40:20 2022 -> WARNING: INSTREAM: Size limit reached, (requested: 842019123, max: 26214400)Thu Feb 10 12:40:20 2022 -> WARNING: INSTREAM: Size limit reached, (requested: 842019123, max: 26214400)Code change...Code: Select all VirusScanningResult ClamAVVirusScanner::Scan(const String &hostName, int primaryPort, const String &sFilename) { LOG_DEBUG("Connecting to ClamAV virus scanner..."); int streamPort = 0; TimeoutCalculator calculator; SynchronousConnection commandConnection(calculator.Calculate(IniFileSettings::Instance()->GetClamMinTimeout(), IniFileSettings::Instance()->GetClamMaxTimeout())); if (!commandConnection.Connect(hostName, primaryPort)) { return VirusScanningResult(_T("ClamAVVirusScanner::Scan"), Formatter::Format("Unable to connect to ClamAV server at {0}:{1}.", hostName, primaryPort)); } if (!commandConnection.Write("nINSTREAM\n")) return VirusScanningResult("ClamAVVirusScanner::Scan", "Unable to write STREAM command."); AnsiString readData; // Send the file on the stream socket. File oFile; if (!oFile.Open(sFilename, File::OTReadOnly)) { String sErrorMsg = Formatter::Format("Could not send file {0} via socket since it does not exist.", sFilename); return VirusScanningResult("ClamAVVirusScanner::Scan", sErrorMsg); } const int STREAM_BLOCK_SIZE = 4096; const int maxIterations = 100000; for (int i = 0; i pBuf = oFile.ReadChunk(STREAM_BLOCK_SIZE); if (!pBuf) break; // Send the request. if (!commandConnection.Write(to_string(htonl(sizeof(*pBuf))))) return VirusScanningResult("ClamAVVirusScanner::Scan", "Unable to write data to stream port."); if (!commandConnection.Write(*pBuf)) return VirusScanningResult("ClamAVVirusScanner::Scan", "Unable to write data to stream port."); } if (!commandConnection.Write(to_string(htonl(0)))) return VirusScanningResult("ClamAVVirusScanner::Scan", "Unable to write data to stream port."); if (!commandConnection.ReadUntil("\n", readData)) return VirusScanningResult("ClamAVVirusScanner::Scan", "Unable to read response (after streaming)."); readData.TrimRight("\n"); // Parse the response and see if a virus was reported. try { const regex expression("^stream.*: (.*) FOUND$"); cmatch what;

Trying to figure out the Perl pack function ... INSTREAMIt 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: '' where is the size of the following data in bytes expressed as a 4 byte unsigned integer in network byte order and 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 limit exceeded and close the connection.NB. This is C#...Code: Select allusing System;public class Example{ public static void Main() { int value = 12345678; byte[] bytes = BitConverter.GetBytes(value); Console.WriteLine(BitConverter.ToString(bytes)); if (BitConverter.IsLittleEndian) Array.Reverse(bytes); Console.WriteLine(BitConverter.ToString(bytes)); // Call method to send byte stream across machine boundaries. // Receive byte stream from beyond machine boundaries. Console.WriteLine(BitConverter.ToString(bytes)); if (BitConverter.IsLittleEndian) Array.Reverse(bytes); Console.WriteLine(BitConverter.ToString(bytes)); int result = BitConverter.ToInt32(bytes, 0); Console.WriteLine("Original value: {0}", value); Console.WriteLine("Returned value: {0}", result); }}// The example displays the following output on a little-endian system:// 4E-61-BC-00// 00-BC-61-4E// 00-BC-61-4E// 4E-61-BC-00// Original value: 12345678// Returned value: 12345678Here is a complete clamav client wrapper written in C# ... #L238-L294htonl is the equivalent for "network-byte-order" in c++ as it seemsYou use either (newline escaped/delimited)or (zero escaped/delimited)workflow:1. send the INSTREAM command: zINSTREAM\0, or nINSTREAM\n2. send (big endian, 4 bytes)3. send the chunk of data corresponding to the above length4. repeat at 2 as long as you have more blocks to send5. send a 0-length block to mark end of stream6. get response CIDR to RegEx: d-fault.nl/cidrtoregexDNS Lookup: d-fault.nl/dnstoolsDKIM Generator: d-fault.nl/dkimgeneratorDNSBL Lookup: d-fault.nl/dnsbllookupGEOIP Lookup: d-fault.nl/geoiplookup SorenR Senior user Posts: 6413 Joined: 2006-08-21 15:38 Location: Denmark Re: BUG: ClamAV 0.104.0 does not work Post by SorenR » 2022-02-10 13:53 RvdH wrote: 2022-02-10 09:36Here is a complete clamav client wrapper written in C# ... #L238-L294htonl is the equivalent for "network-byte-order" in c++ as it seemsYou use either (newline escaped/delimited)or (zero escaped/delimited)workflow:1. send the INSTREAM command: zINSTREAM\0, or nINSTREAM\n2. send (big endian, 4 bytes)3. send the chunk of data corresponding to the above length4. repeat at 2 as long as you have more blocks to send5. send a 0-length block to mark end of stream6. get responseHmm... Something's fishy...ClamAV log:Code: Select allThu Feb 10 12:40:20 2022 -> WARNING: INSTREAM: Size limit reached, (requested: 842019123, max: 26214400)Thu Feb 10 12:40:20 2022 -> WARNING: INSTREAM: Size limit reached, (requested: 842019123, max: 26214400)Code change...Code: Select all VirusScanningResult ClamAVVirusScanner::Scan(const String &hostName, int primaryPort, const String &sFilename) { LOG_DEBUG("Connecting to ClamAV virus scanner..."); int streamPort = 0; TimeoutCalculator calculator; SynchronousConnection commandConnection(calculator.Calculate(IniFileSettings::Instance()->GetClamMinTimeout(), IniFileSettings::Instance()->GetClamMaxTimeout())); if (!commandConnection.Connect(hostName, primaryPort)) { return VirusScanningResult(_T("ClamAVVirusScanner::Scan"), Formatter::Format("Unable to connect to ClamAV server at {0}:{1}.", hostName, primaryPort)); } if (!commandConnection.Write("nINSTREAM\n")) return VirusScanningResult("ClamAVVirusScanner::Scan", "Unable to write STREAM command."); AnsiString readData; // Send the file on the stream socket. File oFile; if (!oFile.Open(sFilename, File::OTReadOnly)) { String sErrorMsg = Formatter::Format("Could not send file {0} via socket since it