From bb85374b79086cd8efde24d23a1bffeb97cae26b Mon Sep 17 00:00:00 2001
From: Tyler Murphy <tylerm@tylerm.dev>
Date: Wed, 5 Apr 2023 23:08:09 -0400
Subject: new c version

---
 src/dns/packet/buffer.rs | 227 -----------------------------------------------
 1 file changed, 227 deletions(-)
 delete mode 100644 src/dns/packet/buffer.rs

(limited to 'src/dns/packet/buffer.rs')

diff --git a/src/dns/packet/buffer.rs b/src/dns/packet/buffer.rs
deleted file mode 100644
index 058156e..0000000
--- a/src/dns/packet/buffer.rs
+++ /dev/null
@@ -1,227 +0,0 @@
-use crate::Result;
-
-pub struct PacketBuffer {
-    pub buf: Vec<u8>,
-    pub pos: usize,
-    pub size: usize,
-}
-
-impl PacketBuffer {
-    pub fn new(buf: Vec<u8>) -> Self {
-        Self {
-            size: buf.len(),
-            buf,
-            pos: 0,
-        }
-    }
-
-    pub fn pos(&self) -> usize {
-        self.pos
-    }
-
-    pub fn step(&mut self, steps: usize) -> Result<()> {
-        self.pos += steps;
-
-        Ok(())
-    }
-
-    pub fn seek(&mut self, pos: usize) -> Result<()> {
-        self.pos = pos;
-
-        Ok(())
-    }
-
-    pub fn read(&mut self) -> Result<u8> {
-        if self.pos >= self.size {
-            return Err("Tried to read past end of buffer".into());
-        }
-        let res = self.buf[self.pos];
-        self.pos += 1;
-        Ok(res)
-    }
-
-    pub fn get(&mut self, pos: usize) -> Result<u8> {
-        if pos >= self.size {
-            return Err("Tried to read past end of buffer".into());
-        }
-        Ok(self.buf[pos])
-    }
-
-    pub fn get_range(&mut self, start: usize, len: usize) -> Result<&[u8]> {
-        if start + len >= self.size {
-            return Err("Tried to read past end of buffer".into());
-        }
-        Ok(&self.buf[start..start + len])
-    }
-
-    pub fn read_u16(&mut self) -> Result<u16> {
-        let res = ((self.read()? as u16) << 8) | (self.read()? as u16);
-
-        Ok(res)
-    }
-
-    pub fn read_u32(&mut self) -> Result<u32> {
-        let res = ((self.read()? as u32) << 24)
-            | ((self.read()? as u32) << 16)
-            | ((self.read()? as u32) << 8)
-            | (self.read()? as u32);
-
-        Ok(res)
-    }
-
-    pub fn read_qname(&mut self, outstr: &mut String) -> Result<()> {
-        let mut pos = self.pos();
-        let mut jumped = false;
-
-        let mut delim = "";
-        let max_jumps = 5;
-        let mut jumps_performed = 0;
-        loop {
-            // Dns Packets are untrusted data, so we need to be paranoid. Someone
-            // can craft a packet with a cycle in the jump instructions. This guards
-            // against such packets.
-            if jumps_performed > max_jumps {
-                return Err(format!("Limit of {max_jumps} jumps exceeded").into());
-            }
-
-            let len = self.get(pos)?;
-
-            if (len & 0xC0) == 0xC0 {
-                if !jumped {
-                    self.seek(pos + 2)?;
-                }
-
-                let b2 = self.get(pos + 1)? as u16;
-                let offset = (((len as u16) ^ 0xC0) << 8) | b2;
-                pos = offset as usize;
-                jumped = true;
-                jumps_performed += 1;
-                continue;
-            }
-
-            pos += 1;
-
-            if len == 0 {
-                break;
-            }
-
-            outstr.push_str(delim);
-
-            let str_buffer = self.get_range(pos, len as usize)?;
-            outstr.push_str(&String::from_utf8_lossy(str_buffer).to_lowercase());
-
-            delim = ".";
-
-            pos += len as usize;
-        }
-
-        if !jumped {
-            self.seek(pos)?;
-        }
-
-        Ok(())
-    }
-
-    pub fn read_string(&mut self, outstr: &mut String) -> Result<()> {
-        let len = self.read()?;
-
-        self.read_string_n(outstr, len)?;
-
-        Ok(())
-    }
-
-    pub fn read_string_n(&mut self, outstr: &mut String, len: u8) -> Result<()> {
-        let mut pos = self.pos;
-
-        let str_buffer = self.get_range(pos, len as usize)?;
-
-        let mut i = 0;
-        for b in str_buffer {
-            let c = *b as char;
-            if c == '\0' {
-                break;
-            }
-            outstr.push(c);
-            i += 1;
-        }
-
-        pos += i;
-        self.seek(pos)?;
-
-        Ok(())
-    }
-
-    pub fn write(&mut self, val: u8) -> Result<()> {
-        if self.size < self.pos {
-            self.size = self.pos;
-        }
-
-        if self.buf.len() <= self.size {
-            self.buf.resize(self.size + 1, 0x00);
-        }
-
-        self.buf[self.pos] = val;
-        self.pos += 1;
-        Ok(())
-    }
-
-    pub fn write_u8(&mut self, val: u8) -> Result<()> {
-        self.write(val)?;
-
-        Ok(())
-    }
-
-    pub fn write_u16(&mut self, val: u16) -> Result<()> {
-        self.write((val >> 8) as u8)?;
-        self.write((val & 0xFF) as u8)?;
-
-        Ok(())
-    }
-
-    pub fn write_u32(&mut self, val: u32) -> Result<()> {
-        self.write(((val >> 24) & 0xFF) as u8)?;
-        self.write(((val >> 16) & 0xFF) as u8)?;
-        self.write(((val >> 8) & 0xFF) as u8)?;
-        self.write((val & 0xFF) as u8)?;
-
-        Ok(())
-    }
-
-    pub fn write_qname(&mut self, qname: &str) -> Result<()> {
-        for label in qname.split('.') {
-            let len = label.len();
-
-            self.write_u8(len as u8)?;
-            for b in label.as_bytes() {
-                self.write_u8(*b)?;
-            }
-        }
-
-        if !qname.is_empty() {
-            self.write_u8(0)?;
-        }
-
-        Ok(())
-    }
-
-    pub fn write_string(&mut self, text: &str) -> Result<()> {
-        for b in text.as_bytes() {
-            self.write_u8(*b)?;
-        }
-
-        Ok(())
-    }
-
-    pub fn set(&mut self, pos: usize, val: u8) -> Result<()> {
-        self.buf[pos] = val;
-
-        Ok(())
-    }
-
-    pub fn set_u16(&mut self, pos: usize, val: u16) -> Result<()> {
-        self.set(pos, (val >> 8) as u8)?;
-        self.set(pos + 1, (val & 0xFF) as u8)?;
-
-        Ok(())
-    }
-}
-- 
cgit v1.2.3-freya