sgutils2: add scsi_inquiry command

src/tools/sgutils2.rs

@@ -6,8 +6,11 @@
 
 use std::os::unix::io::AsRawFd;
 
-use anyhow::{bail, Error};
+use anyhow::{bail, format_err, Error};
 use libc::{c_char, c_int};
+use endian_trait::Endian;
+
+use proxmox::tools::io::ReadExt;
 
 // Opaque wrapper for sg_pt_base
 #[repr(C)]
@@ -19,6 +22,76 @@ impl Drop for SgPtBase  {
     }
 }
 
+/// Peripheral device type text (see `inquiry` command)
+///
+/// see [https://en.wikipedia.org/wiki/SCSI_Peripheral_Device_Type]
+pub const PERIPHERAL_DEVICE_TYPE_TEXT: [&'static str; 32] = [
+    "Disk Drive",
+    "Tape Drive",
+    "Printer",
+    "Processor",
+    "Write-once",
+    "CD-ROM",  // 05h
+    "Scanner",
+    "Optical",
+    "Medium Changer", // 08h
+    "Communications",
+    "ASC IT8",
+    "ASC IT8",
+    "RAID Array",
+    "Enclosure Services",
+    "Simplified direct-access",
+    "Optical card reader/writer",
+    "Bridging Expander",
+    "Object-based Storage",
+    "Automation/Drive Interface",
+    "Security manager",
+    "Reserved",
+    "Reserved",
+    "Reserved",
+    "Reserved",
+    "Reserved",
+    "Reserved",
+    "Reserved",
+    "Reserved",
+    "Reserved",
+    "Reserved",
+    "Reserved",
+    "Unknown",
+];
+
+#[repr(C, packed)]
+#[derive(Endian)]
+struct InquiryPage {
+    peripheral_type: u8,
+    rmb: u8,
+    version: u8,
+    flags3: u8,
+    additional_length: u8,
+    flags5: u8,
+    flags6: u8,
+    flags7: u8,
+    vendor: [u8; 8],
+    product: [u8; 16],
+    revision: [u8; 4],
+    // additional data follows, but we do not need that
+}
+
+/// Inquiry result
+#[derive(Debug)]
+pub struct InquiryInfo {
+    /// Peripheral device type (0-31)
+    pub peripheral_type: u8,
+    /// Peripheral device type as string
+    pub peripheral_type_text: String,
+    /// Vendor
+    pub vendor: String,
+    /// Product
+    pub product: String,
+    /// Revision
+    pub revision: String,
+}
+
 pub const SCSI_PT_RESULT_GOOD:c_int = 0;
 pub const SCSI_PT_RESULT_STATUS:c_int = 1;
 pub const SCSI_PT_RESULT_SENSE:c_int = 2;
@@ -276,3 +349,49 @@ impl <'a, F: AsRawFd> SgRaw<'a, F> {
         Ok(())
     }
 }
+
+// Useful helpers
+
+/// Converts SCSI ASCII text into String, trim zero and spaces
+pub fn scsi_ascii_to_string(data: &[u8]) -> String {
+    String::from_utf8_lossy(data)
+        .trim_matches(char::from(0))
+        .trim()
+        .to_string()
+}
+
+/// Read SCSI Inquiry page
+///
+/// Returns Product/Vendor/Revision and device type.
+pub fn scsi_inquiry<F: AsRawFd>(
+    file: &mut F,
+) -> Result<InquiryInfo, Error> {
+
+    let allocation_len: u8 = u8::MAX;
+    let mut sg_raw = SgRaw::new(file, allocation_len as usize)?;
+    sg_raw.set_timeout(30); // use short timeout
+
+    let mut cmd = Vec::new();
+    cmd.extend(&[0x12, 0, 0, 0, allocation_len, 0]); // INQUIRY
+
+    let data = sg_raw.do_command(&cmd)
+        .map_err(|err| format_err!("SCSI inquiry failed - {}", err))?;
+
+    proxmox::try_block!({
+        let mut reader = &data[..];
+
+        let page: InquiryPage  = unsafe { reader.read_be_value()? };
+
+        let peripheral_type = page.peripheral_type & 31;
+
+        let info = InquiryInfo {
+            peripheral_type,
+            peripheral_type_text: PERIPHERAL_DEVICE_TYPE_TEXT[peripheral_type as usize].to_string(),
+            vendor: scsi_ascii_to_string(&page.vendor),
+            product: scsi_ascii_to_string(&page.product),
+            revision: scsi_ascii_to_string(&page.revision),
+        };
+
+        Ok(info)
+    }).map_err(|err: Error| format_err!("decode inquiry page failed - {}", err))
+}