Initial commit

Author: jchook

.gitignore

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+/target

Cargo.lock

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+[package]
+name = "iprev"
+version = "0.1.0"
+authors = ["Wes Roberts <g0r6p@a.zinc.email>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

Cargo.toml

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+# iprev
+
+Reverse IP utility.
+
+Allows you to easily reverse IPs in your UNIX workflow for PTR or RBL
+lookups.
+
+## Example
+
+```bash
+iprev 185.143.223.168 
+```
+
+Will produce
+
+```
+168.223.143.185.in-addr.arpa
+```

README.md

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+use std::env;
+use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+use std::process;
+
+fn ip_reverse(ip: &IpAddr) -> String {
+    match ip {
+        IpAddr::V4(ip4) => ip4_reverse(ip4, "in-addr.arpa"),
+        IpAddr::V6(ip6) => ip6_reverse(ip6, "ip6.arpa"),
+    }
+}
+
+fn ip4_reverse(ip: &Ipv4Addr, suffix: &str) -> String {
+    let mut rev = String::with_capacity(16 + suffix.len());
+    for oct in ip.octets().iter().rev() {
+        rev.push_str(format!("{}.", oct).as_str());
+    }
+    rev.push_str(suffix);
+    rev
+}
+
+fn ip6_reverse(ip: &Ipv6Addr, suffix: &str) -> String {
+    let mut rev = String::with_capacity(64 + suffix.len());
+    for oct in ip.octets().iter().rev() {
+        rev.push_str(format!("{:x}.", oct & 0x0fu8).as_str());
+        // Rust gets mad about right-shifting set bits, so we need to mask + shift
+        rev.push_str(format!("{:x}.", (oct & 0xf0u8) >> 4u8).as_str());
+    }
+    rev.push_str(suffix);
+    rev
+}
+
+fn main() {
+    let args: Vec<String> = env::args().collect();
+    for arg in args[1..].iter() {
+        let ip: Result<IpAddr, _> = arg.parse();
+        let rev = match ip {
+            Ok(ip) => ip_reverse(&ip),
+            Err(e) => {
+                eprintln!("Unable to parse arguments: {}", e);
+                process::exit(1);
+            }
+        };
+        println!("{}", rev);
+    }
+}