commit 1bf07214ef593cbf5c91807d3e8645379c666b44
Author: nganhkhoa <mail.nganhkhoa@gmail.com>
Date:   Sat Feb 15 17:39:45 2020 +0700

    first init
    Working pdb download and parser
    - Read ntoskrnl.exe for GUID
    - Download correspoding pdb file
    - Parse for globals symbols
    - Parse for offset in structs
    (Only symbols and structs helps with finding
    NonPagedPool{Start,End/First,Last}[Va] are parsed)

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..82fb904
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,35 @@
+/target
+**/*.rs.bk
+
+# Created by https://www.gitignore.io/api/vim
+# Edit at https://www.gitignore.io/?templates=vim
+
+### Vim ###
+# Swap
+[._]*.s[a-v][a-z]
+[._]*.sw[a-p]
+[._]s[a-rt-v][a-z]
+[._]ss[a-gi-z]
+[._]sw[a-p]
+
+# Session
+Session.vim
+Sessionx.vim
+
+# Temporary
+.netrwhist
+*~
+
+# Auto-generated tag files
+tags
+
+# Persistent undo
+[._]*.un~
+
+# Coc configuration directory
+.vim
+
+# End of https://www.gitignore.io/api/vim
+
+ntkrnlmp.pdb
+parsed.txt
\ No newline at end of file
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..c9a8b45
--- /dev/null
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..8acf159
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "parse_pdb_for_offsets"
+version = "0.1.0"
+authors = ["nganhkhoa <mail.nganhkhoa@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+pdb = "0.5.0"
+reqwest = { version = "0.10.1", features = ["blocking"] }
+
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..91feb92
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,183 @@
+extern crate reqwest;
+
+use std::io;
+use std::io::Read;
+use std::fs::File;
+use std::path::Path;
+use std::collections::HashMap;
+
+use pdb::PDB;
+use pdb::SymbolData;
+use pdb::TypeData;
+use pdb::ClassType;
+use pdb::FallibleIterator;
+
+use pdb::TypeFinder;
+use pdb::TypeIndex;
+
+const PDBNAME: &str = "ntkrnlmp.pdb";
+const NTOSKRNL_PATH: &str = "C:\\Windows\\System32\\ntoskrnl.exe";
+const PDB_SERVER_PATH: &str = "http://msdl.microsoft.com/download/symbols";
+
+fn get_type_as_str(type_finder: &TypeFinder, typ: &TypeIndex) -> String {
+    match type_finder.find(*typ).unwrap().parse().unwrap() {
+        TypeData::Class(ct) => {
+            format!("{}", ct.name.to_string())
+        },
+        TypeData::Primitive(pt) => {
+            format!("{:?}", pt.kind)
+        },
+        TypeData::Pointer(pt) => {
+            format!("{}*", get_type_as_str(type_finder, &pt.underlying_type))
+        },
+        unk => {
+            match unk.name() {
+                Some(s) => format!("{}", s.to_string()),
+                _ => "UNNOWN".to_string()
+            }
+        }
+    }
+}
+
+fn parse_pdb() {
+    let f = File::open("ntkrnlmp.pdb").expect("No such file ./ntkrnlmp.pdb");
+    let mut pdb = PDB::open(f).expect("Cannot open as a PDB file");
+
+    let info = pdb.pdb_information().expect("Cannot get pdb information");
+    let dbi = pdb.debug_information().expect("cannot get debug information");
+    println!("PDB for {}, guid: {}, age: {},", dbi.machine_type().unwrap(), info.guid, dbi.age().unwrap_or(0));
+    println!("");
+
+    // find global symbols offset
+    let addr_map = pdb.address_map().expect("Cannot get address map");
+    let glosym = pdb.global_symbols().expect("Cannot get global symbols");
+    let mut symbols = glosym.iter();
+    let need_symbols = [
+        "KdDebuggerDataBlock", "MmNonPagedPoolStart", "MmNonPagedPoolEnd",              // Windows XP
+        "MiNonPagedPoolStartAligned", "MiNonPagedPoolEnd", "MiNonPagedPoolBitMap",      // Windows 7, 8
+        "MiState"                                                                       // Windows 10
+    ];
+    while let Some(symbol) = symbols.next().unwrap() {
+        match symbol.parse() {
+            Ok(SymbolData::PublicSymbol(data)) => {
+                let name = symbol.name().unwrap().to_string();
+                for sym in need_symbols.iter() {
+                    if &name == sym {
+                        let rva = data.offset.to_rva(&addr_map).unwrap_or_default();
+                        println!("{} {} {}:{}", name, rva, data.offset.section, data.offset.offset);
+                    }
+                }
+            },
+            _ => {
+                // println!("Something else");
+            }
+        }
+    }
+    println!("");
+
+    let mut need_structs = HashMap::new();
+    need_structs.insert("_KDDEBUGGER_DATA64", vec![
+        "MmNonPagedPoolStart", "MmNonPagedPoolEnd",                                     // Windows XP
+        "MiNonPagedPoolStartAligned", "MiNonPagedPoolEnd", "MiNonPagedPoolBitMap",      // Windows 7, 8 -- not sure, global symbols
+        "MiState"                                                                       // Windows 10   -- not sure, global symbols
+    ]);
+
+    // these struct supports finding NonPagedPool{First,Last}Va in windows 10
+    need_structs.insert("_MI_SYSTEM_INFORMATION", vec![
+        "Hardware",                 // windows 10 2016+
+        "SystemNodeInformation"     // windows 10 2015
+    ]);
+    need_structs.insert("_MI_HARDWARE_STATE", vec![
+        "SystemNodeInformation",    // till windows 10 1900
+        "SystemNodeNonPagedPool"    // windows insider, 2020
+    ]);
+    need_structs.insert("_MI_SYSTEM_NODE_INFORMATION", vec![        // till windows 10 1900
+        "NonPagedPoolFirstVa", "NonPagedPoolLastVa",
+        "NonPagedBitMap"                                            // missing on windows 10 1900+
+    ]);
+    need_structs.insert("_MI_SYSTEM_NODE_NONPAGED_POOL", vec![      // windows insider, 2020
+        "NonPagedPoolFirstVa", "NonPagedPoolLastVa"
+    ]);
+
+    let type_information = pdb.type_information().expect("Cannot get type information");
+    let mut type_finder = type_information.type_finder();
+    let mut iter = type_information.iter();
+    while let Some(typ) = iter.next().unwrap() {
+        type_finder.update(&iter);
+        match typ.parse() {
+            Ok(TypeData::Class(ClassType {name, fields: Some(fields), ..})) => {
+                let n = name.to_string();
+                // println!("{}", name);
+                if !need_structs.contains_key(&*n) {
+                    continue;
+                }
+                println!("struct {}", name);
+                match type_finder.find(fields).unwrap().parse().unwrap() {
+                    TypeData::FieldList(list) => {
+                        // `fields` is a Vec<TypeData>
+                        for field in list.fields {
+                            if let TypeData::Member(member) = field {
+                                let mem_typ = get_type_as_str(&type_finder, &member.field_type);
+                                println!("  - field {} {} at offset {:x}", mem_typ, member.name, member.offset);
+                            } else {
+                                // handle member functions, nested types, etc.
+                            }
+                        }
+                    }
+                    _ => {}
+                }
+                println!("");
+            },
+            _ => {}
+        }
+    }
+}
+
+fn download_pdb() {
+    let mut ntoskrnl = File::open(NTOSKRNL_PATH).expect("Cannot open ntoskrnl.exe");
+
+    let mut buffer = Vec::new();
+    ntoskrnl.read_to_end(&mut buffer).expect("Cannot read file ntoskrnl.exe");
+
+    let mut buffiter = buffer.chunks(4);
+    while buffiter.next().unwrap() != [0x52, 0x53, 0x44, 0x53] {
+        // signature == RSDS
+    }
+
+    // next 16 bytes is guid in raw bytes
+    let raw_guid: Vec<u8> = vec![
+        buffiter.next().unwrap(),
+        buffiter.next().unwrap(),
+        buffiter.next().unwrap(),
+        buffiter.next().unwrap(),
+    ].concat();
+
+    // guid to hex string
+    let guid = (vec![
+        raw_guid[3], raw_guid[2], raw_guid[1], raw_guid[0],
+        raw_guid[5], raw_guid[4],
+        raw_guid[7], raw_guid[6],
+        raw_guid[8], raw_guid[9], raw_guid[10], raw_guid[11],
+        raw_guid[12], raw_guid[13], raw_guid[14], raw_guid[15],
+    ].iter().map(|b| format!("{:02X}", b)).collect::<Vec<String>>()).join("");
+
+    // next 4 bytes is age, in little endian
+    let raw_age = buffiter.next().unwrap();
+    let age = u32::from_le_bytes([
+        raw_age[0], raw_age[1], raw_age[2], raw_age[3]
+    ]);
+
+    let downloadurl = format!("{}/{}/{}{:X}/{}", PDB_SERVER_PATH, PDBNAME, guid, age, PDBNAME);
+    println!("{}", downloadurl);
+
+    let mut resp = reqwest::blocking::get(&downloadurl).expect("request failed");
+    let mut out = File::create(PDBNAME).expect("failed to create file");
+    io::copy(&mut resp, &mut out).expect("failed to copy content");
+}
+
+fn main() {
+    if !Path::new(PDBNAME).exists() {
+        download_pdb();
+    }
+    parse_pdb();
+}