From 226eefbedd66e19898123655af0b1a856e16df6e Mon Sep 17 00:00:00 2001 From: Andrew Rioux Date: Fri, 28 Apr 2023 14:37:07 -0400 Subject: [PATCH] feat: initial commit with static pcap sys build --- .devcontainer/Dockerfile | 19 + .devcontainer/devcontainer.json | 23 ++ .gitignore | 1 + .gitmodules | 3 + Cargo.lock | 456 ++++++++++++++++++++++ Cargo.toml | 10 + LICENSE | 661 ++++++++++++++++++++++++++++++++ README.org | 6 + docker-compose.yml | 0 pcap-sys/Cargo.toml | 28 ++ pcap-sys/README.org | 0 pcap-sys/build.rs | 36 ++ pcap-sys/libpcap | 1 + pcap-sys/src/error.rs | 72 ++++ pcap-sys/src/ffi.rs | 183 +++++++++ pcap-sys/src/lib.rs | 472 +++++++++++++++++++++++ pcap-sys/src/packets.rs | 346 +++++++++++++++++ 17 files changed, 2317 insertions(+) create mode 100644 .devcontainer/Dockerfile create mode 100644 .devcontainer/devcontainer.json create mode 100644 .gitignore create mode 100644 .gitmodules create mode 100644 Cargo.lock create mode 100644 Cargo.toml create mode 100644 LICENSE create mode 100644 README.org create mode 100644 docker-compose.yml create mode 100644 pcap-sys/Cargo.toml create mode 100644 pcap-sys/README.org create mode 100644 pcap-sys/build.rs create mode 160000 pcap-sys/libpcap create mode 100644 pcap-sys/src/error.rs create mode 100644 pcap-sys/src/ffi.rs create mode 100644 pcap-sys/src/lib.rs create mode 100644 pcap-sys/src/packets.rs diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile new file mode 100644 index 0000000..0c395ec --- /dev/null +++ b/.devcontainer/Dockerfile @@ -0,0 +1,19 @@ +# Copyright (C) 2023 Andrew Rioux +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU Affero General Public License as +# published by the Free Software Foundation, either version 3 of the +# License, or (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU Affero General Public License for more details. +# +# You should have received a copy of the GNU Affero General Public License +# along with this program. If not, see . + +FROM rust:1-alpine + +RUN apk add bash docker git cmake make automake musl-dev \ + flex bison linux-headers openssl-dev \ No newline at end of file diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json new file mode 100644 index 0000000..1f40fc0 --- /dev/null +++ b/.devcontainer/devcontainer.json @@ -0,0 +1,23 @@ +{ + "name": "sparse", + "build": { + "dockerfile": "Dockerfile" + }, + "customizations": { + "vscode": { + "settings": { + "licenser.license": "AGPLv3", + "licenser.projectName": "sparse" + }, + "extensions": [ + "tootone.org-mode", + "rust-lang.rust-analyzer", + "ymotongpoo.licenser", + "ms-azuretools.vscode-docker", + "bungcip.better-toml" + ] + } + }, + "runArgs": ["--privileged"], + "postStartCommand": "nohup bash -c 'dockerd &' > /docker.log 2> /docker.log" +} \ No newline at end of file diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..1de5659 --- /dev/null +++ b/.gitignore @@ -0,0 +1 @@ +target \ No 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If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If your software can interact with users remotely through a computer +network, you should also make sure that it provides a way for users to +get its source. For example, if your program is a web application, its +interface could display a "Source" link that leads users to an archive +of the code. There are many ways you could offer source, and different +solutions will be better for different programs; see section 13 for the +specific requirements. + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU AGPL, see +. \ No newline at end of file diff --git a/README.org b/README.org new file mode 100644 index 0000000..bfff701 --- /dev/null +++ b/README.org @@ -0,0 +1,6 @@ +#+TITLE: Sparse: A Rust C2 framework + +Developed using libpcap to enable evading local firewalls and with an eye towards + +* Packages +** [[./pcap-sys/README.org][pcap-sys]] \ No newline at end of file diff --git a/docker-compose.yml b/docker-compose.yml new file mode 100644 index 0000000..e69de29 diff --git a/pcap-sys/Cargo.toml b/pcap-sys/Cargo.toml new file mode 100644 index 0000000..c697a58 --- /dev/null +++ b/pcap-sys/Cargo.toml @@ -0,0 +1,28 @@ +# Copyright (C) 2023 Andrew Rioux +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU Affero General Public License as +# published by the Free Software Foundation, either version 3 of the +# License, or (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU Affero General Public License for more details. +# +# You should have received a copy of the GNU Affero General Public License +# along with this program. If not, see . + +[package] +name = "pcap-sys" +version = "0.1.0" +edition = "2021" + +[dependencies] +errno = "0.2.8" +futures = "0.3.25" +libc = "0.2.137" +tokio = { version = "1.21.2", features = ["net", "rt", "macros", "rt-multi-thread" ] } + +[build-dependencies] +cmake = "0.1" \ No newline at end of file diff --git a/pcap-sys/README.org b/pcap-sys/README.org new file mode 100644 index 0000000..e69de29 diff --git a/pcap-sys/build.rs b/pcap-sys/build.rs new file mode 100644 index 0000000..19035e6 --- /dev/null +++ b/pcap-sys/build.rs @@ -0,0 +1,36 @@ +// Copyright (C) 2023 Andrew Rioux +// +// This program is free software: you can redistribute it and/or modify +// it under the terms of the GNU Affero General Public License as +// published by the Free Software Foundation, either version 3 of the +// License, or (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Affero General Public License for more details. +// +// You should have received a copy of the GNU Affero General Public License +// along with this program. If not, see . + +fn main() { + let dst = cmake::Config::new("libpcap") + .define("BUILD_SHARED_LIBS", "OFF") + .define("BUILD_WITH_LIBNL", "OFF") + .define("DISABLE_BLUETOOTH", "ON") + .define("DISABLE_DAG", "ON") + .define("DISABLE_DBUS", "ON") + .define("DISABLE_DPDK", "ON") + .define("DISABLE_LINUX_USBMON", "ON") + .define("DISABLE_NETMAP", "ON") + .define("DISABLE_RDMA", "ON") + .define("DISABLE_SEPTEL", "ON") + .define("DISABLE_SNF", "ON") + .define("DISABLE_TC", "ON") + .define("PCAP_TYPE", "linux") + .build(); + + // panic!("hahahahah test {}", dst.display()); + println!("cargo:rustc-link-search=native={}/lib", dst.display()); + println!("cargo:rustc-link-lib=static=pcap"); +} \ No newline at end of file diff --git a/pcap-sys/libpcap b/pcap-sys/libpcap new file mode 160000 index 0000000..ab3f6a6 --- /dev/null +++ b/pcap-sys/libpcap @@ -0,0 +1 @@ +Subproject commit ab3f6a677ba66a9679c6f3412f0320a5776842d0 diff --git a/pcap-sys/src/error.rs b/pcap-sys/src/error.rs new file mode 100644 index 0000000..973915a --- /dev/null +++ b/pcap-sys/src/error.rs @@ -0,0 +1,72 @@ +// Copyright (C) 2023 Andrew Rioux +// +// This program is free software: you can redistribute it and/or modify +// it under the terms of the GNU Affero General Public License as +// published by the Free Software Foundation, either version 3 of the +// License, or (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Affero General Public License for more details. +// +// You should have received a copy of the GNU Affero General Public License +// along with this program. If not, see . + +use errno::Errno; +use std::{ + convert::From, + ffi::{self, CStr, CString}, +}; + +#[derive(Debug)] +pub enum Error { + PcapError(CString), + StringParse, + UnknownPacketType(u16), + PacketLengthInvalid, + InvalidPcapFd, + Io(std::io::Error), + Libc(Errno), +} + +pub type Result = std::result::Result; + +impl From<&[i8; 256]> for Error { + fn from(buf: &[i8; 256]) -> Error { + match CString::new( + buf.iter() + .take_while(|&&v| v != 0) + .map(|&v| v as u8) + .collect::>(), + ) { + Ok(s) => Error::PcapError(s), + Err(_) => Error::StringParse, + } + } +} + +impl From<*const i8> for Error { + #[allow(clippy::not_unsafe_ptr_arg_deref)] + fn from(buf: *const i8) -> Error { + Error::PcapError(unsafe { CStr::from_ptr(buf) }.to_owned()) + } +} + +impl From for Error { + fn from(_err: ffi::NulError) -> Error { + Error::StringParse + } +} + +impl From for Error { + fn from(err: std::io::Error) -> Error { + Error::Io(err) + } +} + +impl From for Error { + fn from(err: Errno) -> Error { + Error::Libc(err) + } +} diff --git a/pcap-sys/src/ffi.rs b/pcap-sys/src/ffi.rs new file mode 100644 index 0000000..4c050a8 --- /dev/null +++ b/pcap-sys/src/ffi.rs @@ -0,0 +1,183 @@ +// Copyright (C) 2023 Andrew Rioux +// +// This program is free software: you can redistribute it and/or modify +// it under the terms of the GNU Affero General Public License as +// published by the Free Software Foundation, either version 3 of the +// License, or (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Affero General Public License for more details. +// +// You should have received a copy of the GNU Affero General Public License +// along with this program. If not, see . + +use libc::{c_char, c_int, c_uchar, c_uint, c_ushort, c_void}; + +pub const DLT_NULL: i32 = 0; +pub const DLT_EN10MB: i32 = 1; +pub const DLT_EN3MB: i32 = 2; +pub const DLT_AX25: i32 = 3; +pub const DLT_PRONET: i32 = 4; +pub const DLT_CHAOS: i32 = 5; +pub const DLT_IEEE802: i32 = 6; +pub const DLT_ARCNET: i32 = 7; +pub const DLT_SLIP: i32 = 8; +pub const DLT_PPP: i32 = 9; +pub const DLT_FDDI: i32 = 10; + +pub const PCAP_VERSION_MAJOR: c_int = 2; +pub const PCAP_VERSION_MINOR: c_int = 4; +pub const PCAP_ERRBUF_SIZE: usize = 256; +pub const PCAP_IF_LOOPBACK: c_int = 0x00000001; +pub const PCAP_IF_UP: c_int = 0x00000002; +pub const PCAP_IF_RUNNING: c_int = 0x00000004; +pub const PCAP_IF_WIRELESS: c_int = 0x00000008; +pub const PCAP_IF_CONNECTION_STATUS: c_int = 0x00000030; +pub const PCAP_IF_CONNECTION_STATUS_UNKNOWN: c_int = 0x00000000; +pub const PCAP_IF_CONNECTION_STATUS_CONNECTED: c_int = 0x00000010; +pub const PCAP_IF_CONNECTION_STATUS_DISCONNECTED: c_int = 0x00000020; +pub const PCAP_IF_CONNECTION_STATUS_NOT_APPLICABLE: c_int = 0x00000030; +pub const PCAP_ERROR: c_int = -1; +pub const PCAP_ERROR_BREAK: c_int = -2; +pub const PCAP_ERROR_NOT_ACTIVATED: c_int = -3; +pub const PCAP_ERROR_ACTIVATED: c_int = -4; +pub const PCAP_ERROR_NO_SUCH_DEVICE: c_int = -5; +pub const PCAP_ERROR_RFMON_NOTSUP: c_int = -6; +pub const PCAP_ERROR_NOT_RFMON: c_int = -7; +pub const PCAP_ERROR_PERM_DENIED: c_int = -8; +pub const PCAP_ERROR_IFACE_NOT_UP: c_int = -9; +pub const PCAP_ERROR_CANTSET_TSTAMP_TYPE: c_int = 10; +pub const PCAP_ERROR_PROMISC_PERM_DENIED: c_int = -11; +pub const PCAP_ERROR_TSTAMP_PRECISION_NOTSUP: c_int = -12; +pub const PCAP_WARNING: c_int = 1; +pub const PCAP_WARNING_PROMISC_NOTSUP: c_int = 2; +pub const PCAP_WARNING_TSTAMP_TYPE_NOTSUP: c_int = 3; +pub const PCAP_NETMASK_UNKNOWN: u32 = 0xffffffff; +pub const PCAP_CHAR_ENC_LOCAL: c_int = 0x00000000; +pub const PCAP_CHAR_ENC_UTF_8: c_int = 0x00000001; +pub const PCAP_TSTAMP_HOST: c_int = 0; +pub const PCAP_TSTAMP_HOST_LOWPREC: c_int = 1; +pub const PCAP_TSTAMP_HOST_HIPREC: c_int = 2; +pub const PCAP_TSTAMP_ADAPTER: c_int = 3; +pub const PCAP_TSTAMP_ADAPTER_UNSYNCED: c_int = 4; +pub const PCAP_TSTAMP_HOST_HIPREC_UNSYNCED: c_int = 5; +pub const PCAP_TSTAMP_PRECISION_MICRO: c_int = 0; +pub const PCAP_TSTAMP_PRECISION_NANO: c_int = 1; +pub const PCAP_BUF_SIZE: c_int = 1024; +pub const PCAP_SRC_FILE: c_int = 2; +pub const PCAP_SRC_IFLOCAL: c_int = 3; +pub const PCAP_SRC_IFREMOTE: c_int = 4; +pub const PCAP_SRC_FILE_STRING: &[u8] = b"file://"; +pub const PCAP_SRC_IF_STRING: &[u8] = b"rpcap://"; +pub const PCAP_OPENFLAG_PROMISCUOUS: c_int = 0x00000001; +pub const PCAP_OPENFLAG_DATATX_UDP: c_int = 0x00000002; +pub const PCAP_OPENFLAG_NOCAPTURE_RPCAP: c_int = 0x00000004; +pub const PCAP_OPENFLAG_NOCAPTURE_LOCAL: c_int = 0x00000008; +pub const PCAP_OPENFLAG_MAX_RESPONSIVENESS: c_int = 0x00000010; +pub const RPCAP_RMTAUTH_NULL: c_int = 0; +pub const RPCAP_RMTAUTH_PWD: c_int = 1; +pub const PCAP_SAMP_NOSAMP: c_int = 0; +pub const PCAP_SAMP_1_EVERY_N: c_int = 1; +pub const PCAP_SAMP_FIRST_AFTER_N_MS: c_int = 2; +pub const RPCAP_HOSTLIST_SIZE: c_int = 1024; + +pub const BUFSIZ: c_int = 8192; + +#[repr(C)] +pub struct PcapDev { + _data: [u8; 0], +} + +#[repr(C)] +pub struct SockAddr { + pub sa_family: c_ushort, + pub sa_data: [u8; 14], +} + +#[repr(C)] +pub struct PcapAddr { + pub next: *const PcapAddr, + pub addr: *const SockAddr, + pub netmask: *const SockAddr, + pub broadaddr: *const SockAddr, + pub dstaddr: *const SockAddr, +} + +#[repr(C)] +pub struct PcapDevIf { + pub next: *const PcapDevIf, + pub name: *const c_char, + pub description: *const c_char, + pub addresses: *const PcapAddr, + pub flags: u32, +} + +#[repr(C)] +pub struct bpf_insn { + code: c_ushort, + jt: c_uchar, + jf: c_uchar, + k: u32, +} + +#[repr(C)] +pub struct BpfProgram { + pub bf_len: c_uint, + pub bpf_insn: *const bpf_insn, +} + +#[repr(C)] +pub struct PktHeader { + pub ts: libc::timeval, + pub caplen: u32, + pub len: u32, +} + +// #[link(name = "pcap", kind = "static", modifiers = "+whole-archive")] +extern "C" { + pub fn pcap_findalldevs(pcap_dev_if: *mut *const PcapDevIf, errbuf: *mut c_char) -> c_int; + pub fn pcap_freealldevs(pcap_dev_if: *const PcapDevIf); + pub fn pcap_create(source: *const c_char, errbuf: *mut c_char) -> *mut PcapDev; + pub fn pcap_close(p: *mut PcapDev); + pub fn pcap_set_promisc(dev: *mut PcapDev, promisc: c_int) -> c_int; + pub fn pcap_set_buffer_size(dev: *mut PcapDev, bufsize: c_int) -> c_int; + pub fn pcap_set_timeout(dev: *mut PcapDev, ms: c_int) -> c_int; + pub fn pcap_activate(dev: *mut PcapDev) -> c_int; + pub fn pcap_datalink(dev: *mut PcapDev) -> c_int; + pub fn pcap_geterr(dev: *mut PcapDev) -> *const c_char; + pub fn pcap_lookupnet( + dev: *const c_char, + net: *mut u32, + mask: *mut u32, + errbuf: *mut c_char, + ) -> c_int; + pub fn pcap_compile( + dev: *mut PcapDev, + fp: *mut BpfProgram, + filter_exp: *const i8, + optimize: c_int, + mask: u32, + ) -> c_int; + pub fn pcap_setfilter(dev: *mut PcapDev, fp: *const BpfProgram) -> c_int; + pub fn pcap_loop( + p: *mut PcapDev, + cnt: c_int, + callback: unsafe extern "C" fn( + user: *mut c_void, + header: *const PktHeader, + data: *const u8, + ), + user: *mut c_void, + ) -> c_int; + pub fn pcap_breakloop(p: *mut PcapDev); + pub fn pcap_sendpacket(p: *mut PcapDev, buf: *const c_uchar, size: c_int) -> c_int; + pub fn pcap_setnonblock(dev: *mut PcapDev, nonblock: c_int, errbuf: *mut c_char) -> c_int; + pub fn pcap_get_selectable_fd(p: *mut PcapDev) -> c_int; + pub fn pcap_next_ex( + p: *mut PcapDev, + header: *mut *mut PktHeader, + pkt_data: *mut *mut c_char, + ) -> c_int; +} diff --git a/pcap-sys/src/lib.rs b/pcap-sys/src/lib.rs new file mode 100644 index 0000000..f4ac3d9 --- /dev/null +++ b/pcap-sys/src/lib.rs @@ -0,0 +1,472 @@ +// Copyright (C) 2023 Andrew Rioux +// +// This program is free software: you can redistribute it and/or modify +// it under the terms of the GNU Affero General Public License as +// published by the Free Software Foundation, either version 3 of the +// License, or (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Affero General Public License for more details. +// +// You should have received a copy of the GNU Affero General Public License +// along with this program. If not, see . + +use std::{ + ffi::{CStr, CString}, + os::fd::{AsRawFd, RawFd}, + pin::Pin, + ptr, slice, + task::{self, Poll}, +}; + +pub mod error; +mod ffi; +pub mod packets; + +pub mod consts { + pub use super::ffi::{ + BUFSIZ, DLT_ARCNET, DLT_AX25, DLT_CHAOS, DLT_EN10MB, DLT_EN3MB, DLT_FDDI, DLT_IEEE802, + DLT_NULL, DLT_PPP, DLT_PRONET, DLT_SLIP, PCAP_BUF_SIZE, PCAP_CHAR_ENC_LOCAL, + PCAP_CHAR_ENC_UTF_8, PCAP_ERRBUF_SIZE, PCAP_ERROR, PCAP_ERROR_ACTIVATED, PCAP_ERROR_BREAK, + PCAP_ERROR_CANTSET_TSTAMP_TYPE, PCAP_ERROR_IFACE_NOT_UP, PCAP_ERROR_NOT_ACTIVATED, + PCAP_ERROR_NOT_RFMON, PCAP_ERROR_NO_SUCH_DEVICE, PCAP_ERROR_PERM_DENIED, + PCAP_ERROR_PROMISC_PERM_DENIED, PCAP_ERROR_RFMON_NOTSUP, + PCAP_ERROR_TSTAMP_PRECISION_NOTSUP, PCAP_IF_CONNECTION_STATUS, + PCAP_IF_CONNECTION_STATUS_CONNECTED, PCAP_IF_CONNECTION_STATUS_DISCONNECTED, + PCAP_IF_CONNECTION_STATUS_NOT_APPLICABLE, PCAP_IF_CONNECTION_STATUS_UNKNOWN, + PCAP_IF_LOOPBACK, PCAP_IF_RUNNING, PCAP_IF_UP, PCAP_IF_WIRELESS, PCAP_NETMASK_UNKNOWN, + PCAP_OPENFLAG_DATATX_UDP, PCAP_OPENFLAG_MAX_RESPONSIVENESS, PCAP_OPENFLAG_NOCAPTURE_LOCAL, + PCAP_OPENFLAG_NOCAPTURE_RPCAP, PCAP_OPENFLAG_PROMISCUOUS, PCAP_SAMP_1_EVERY_N, + PCAP_SAMP_FIRST_AFTER_N_MS, PCAP_SAMP_NOSAMP, PCAP_SRC_FILE, PCAP_SRC_FILE_STRING, + PCAP_SRC_IFLOCAL, PCAP_SRC_IFREMOTE, PCAP_SRC_IF_STRING, PCAP_TSTAMP_ADAPTER, + PCAP_TSTAMP_ADAPTER_UNSYNCED, PCAP_TSTAMP_HOST, PCAP_TSTAMP_HOST_HIPREC, + PCAP_TSTAMP_HOST_HIPREC_UNSYNCED, PCAP_TSTAMP_HOST_LOWPREC, PCAP_TSTAMP_PRECISION_MICRO, + PCAP_TSTAMP_PRECISION_NANO, PCAP_VERSION_MAJOR, PCAP_VERSION_MINOR, PCAP_WARNING, + PCAP_WARNING_PROMISC_NOTSUP, PCAP_WARNING_TSTAMP_TYPE_NOTSUP, RPCAP_HOSTLIST_SIZE, + RPCAP_RMTAUTH_NULL, RPCAP_RMTAUTH_PWD, + }; +} + +use ffi::PcapDevIf; +use futures::ready; +use tokio::io::unix::AsyncFd; + +pub struct PcapDevIterator { + dev_if: *const PcapDevIf, + current_dev: *const PcapDevIf, +} + +impl PcapDevIterator { + pub fn new() -> error::Result { + let mut errbuf = [0i8; ffi::PCAP_ERRBUF_SIZE]; + let mut dev_if = ptr::null(); + + if unsafe { ffi::pcap_findalldevs(&mut dev_if, errbuf.as_mut_ptr()) } != 0 { + Err(&errbuf)?; + } + + Ok(PcapDevIterator { + dev_if, + current_dev: dev_if, + }) + } +} + +impl Drop for PcapDevIterator { + fn drop(&mut self) { + unsafe { + ffi::pcap_freealldevs(self.dev_if); + } + } +} + +impl std::iter::Iterator for PcapDevIterator { + type Item = String; + + fn next(&mut self) -> Option { + unsafe { + if self.current_dev.is_null() { + return None; + } + + let current_dev = self.current_dev; + + let dev_name = CStr::from_ptr((*current_dev).name) + .to_str() + .unwrap() + .to_string(); + + self.current_dev = (*current_dev).next; + + Some(dev_name) + } + } +} + +pub trait State {} +pub trait Activated: State {} +pub trait NotListening: Activated {} +pub trait Listening: Activated {} +pub trait Disabled: State {} + +pub enum DevActivated {} +impl State for DevActivated {} +impl Activated for DevActivated {} +impl NotListening for DevActivated {} + +pub enum DevDisabled {} +impl State for DevDisabled {} +impl Disabled for DevDisabled {} + +pub enum DevListening {} +impl State for DevListening {} +impl Activated for DevListening {} +impl Listening for DevListening {} + +pub struct BpfProgram {} + +pub struct Interface { + dev_name: CString, + dev: *mut ffi::PcapDev, + marker: std::marker::PhantomData, + absorbed: bool, + nonblocking: bool, +} + +impl Drop for Interface { + fn drop(&mut self) { + if !self.absorbed { + unsafe { ffi::pcap_close(self.dev) }; + } + } +} + +unsafe impl Send for Interface {} + +impl Interface { + pub fn new(name: &str) -> error::Result> { + let mut errbuf = [0i8; ffi::PCAP_ERRBUF_SIZE]; + + let dev_name = CString::new(name)?; + let dev = unsafe { ffi::pcap_create(dev_name.as_ptr(), errbuf.as_mut_ptr()) }; + + if dev.is_null() { + Err(&errbuf)?; + } + + Ok(Interface:: { + dev_name, + dev, + marker: std::marker::PhantomData, + absorbed: false, + nonblocking: false, + }) + } + + pub fn lookupnet(&self) -> error::Result<(u32, u32)> { + let mut errbuf = [0i8; ffi::PCAP_ERRBUF_SIZE]; + let mut net: u32 = 0; + let mut mask: u32 = 0; + + if unsafe { + ffi::pcap_lookupnet( + self.dev_name.as_ptr(), + &mut net as *mut u32, + &mut mask as *mut u32, + errbuf.as_mut_ptr(), + ) + } == -1 + { + Err(error::Error::from(&errbuf))?; + } + + Ok((net, mask)) + } + + pub fn set_non_blocking(&mut self, nonblocking: bool) -> error::Result<()> { + self.nonblocking = nonblocking; + + let mut errbuf = [0i8; ffi::PCAP_ERRBUF_SIZE]; + + if unsafe { ffi::pcap_setnonblock(self.dev, i32::from(nonblocking), errbuf.as_mut_ptr()) } + == -1 + { + Err(error::Error::from(&errbuf))?; + } + + Ok(()) + } +} + +impl Interface { + pub fn set_promisc(&mut self, promisc: bool) -> error::Result<()> { + if unsafe { ffi::pcap_set_promisc(self.dev, i32::from(promisc)) } != 0 { + Err(unsafe { ffi::pcap_geterr(self.dev) })?; + } + + Ok(()) + } + + pub fn set_buffer_size(&mut self, bufsize: i32) -> error::Result<()> { + if unsafe { ffi::pcap_set_buffer_size(self.dev, bufsize) } != 0 { + Err(unsafe { ffi::pcap_geterr(self.dev) })?; + } + + Ok(()) + } + + pub fn set_timeout(&mut self, timeout: i32) -> error::Result<()> { + if unsafe { ffi::pcap_set_timeout(self.dev, timeout) } != 0 { + Err(unsafe { ffi::pcap_geterr(self.dev) })?; + } + + Ok(()) + } + + pub fn activate(mut self) -> error::Result> { + if unsafe { ffi::pcap_activate(self.dev) } != 0 { + Err(unsafe { ffi::pcap_geterr(self.dev) })?; + } + + self.absorbed = true; + + Ok(Interface:: { + dev_name: self.dev_name.clone(), + dev: self.dev, + marker: std::marker::PhantomData, + absorbed: false, + nonblocking: self.nonblocking, + }) + } +} + +impl Interface { + pub fn datalink(&self) -> i32 { + unsafe { ffi::pcap_datalink(self.dev) } + } + + pub fn set_filter( + &mut self, + filter: &str, + optimize: bool, + mask: Option, + ) -> error::Result> { + let mut bpf = ffi::BpfProgram { + bf_len: 0, + bpf_insn: ptr::null(), + }; + + let mask = if let Some(m) = mask { + m + } else { + let (_, m) = self.lookupnet()?; + m + }; + + let filter = CString::new(filter)?; + + if unsafe { + ffi::pcap_compile( + self.dev, + &mut bpf as *mut ffi::BpfProgram, + filter.as_ptr(), + i32::from(optimize), + mask, + ) + } == -1 + { + Err(unsafe { ffi::pcap_geterr(self.dev) })?; + } + + if unsafe { ffi::pcap_setfilter(self.dev, &bpf as *const ffi::BpfProgram) } == -1 { + Err(unsafe { ffi::pcap_geterr(self.dev) })?; + } + + Ok(Box::new(bpf)) + } + + pub fn sendpacket(&self, packet: packets::EthernetPkt) -> error::Result<()> { + dbg!(packet.data.len()); + + if unsafe { + ffi::pcap_sendpacket( + self.dev, + packet.data.as_ptr(), + packet.data.len().try_into().unwrap(), + ) + } == ffi::PCAP_ERROR + { + Err(unsafe { ffi::pcap_geterr(self.dev) })?; + } + + Ok(()) + } + + pub fn next_packet(&mut self) -> error::Result { + let mut header: *mut ffi::PktHeader = ptr::null_mut(); + let mut data: *mut libc::c_char = ptr::null_mut(); + + if unsafe { ffi::pcap_next_ex(self.dev, &mut header as *mut _, &mut data as *mut _) < 1 } { + return unsafe { Err(ffi::pcap_geterr(self.dev))? }; + } + + let rdata = unsafe { slice::from_raw_parts(data as *mut u8, (*header).caplen as usize) }; + if rdata.len() < 24 { + return Err(error::Error::PacketLengthInvalid); + } + + Ok(packets::EthernetPkt { data: rdata }.to_owned()) + } +} + +struct ListenHandler<'a, F> +where + F: Fn(&Interface, packets::EthernetPkt) -> error::Result, +{ + packet_handler: F, + break_on_fail: bool, + fail_error: Option, + interface: &'a Interface, +} + +impl Interface { + pub fn listen( + &self, + packet_handler: F, + break_on_fail: bool, + packet_count: i32, + ) -> (Option, i32) + where + F: Fn(&Interface, packets::EthernetPkt) -> error::Result, + { + unsafe extern "C" fn cback( + user: *mut libc::c_void, + header: *const ffi::PktHeader, + data: *const u8, + ) where + F: Fn(&Interface, packets::EthernetPkt) -> error::Result, + { + let info = &mut *(user as *mut ListenHandler); + + let data = slice::from_raw_parts(data, (*header).caplen as usize); + + if data.len() < 14 { + eprintln!( + " * Failed to get full packet, captured {} bytes", + data.len() + ); + } + + let result = (info.packet_handler)(info.interface, packets::EthernetPkt { data }); + + match result { + Err(e) => { + eprintln!(" * Packet handle error: {:?}", e); + if info.break_on_fail { + info.fail_error = Some(e); + ffi::pcap_breakloop(info.interface.dev); + } + } + Ok(b) => { + if b { + ffi::pcap_breakloop(info.interface.dev); + } + } + } + } + + let interface = Interface { + dev_name: self.dev_name.clone(), + dev: self.dev, + marker: std::marker::PhantomData, + absorbed: true, + nonblocking: self.nonblocking, + }; + + let mut info = ListenHandler:: { + packet_handler, + break_on_fail, + fail_error: None, + interface: &interface, + }; + + let count = unsafe { + ffi::pcap_loop( + self.dev, + packet_count, + cback::, + &mut info as *mut ListenHandler as *mut libc::c_void, + ) + }; + + (info.fail_error, count) + } + + pub fn stream(mut self) -> error::Result> { + self.set_non_blocking(true)?; + + Ok(InterfaceStream { + inner: AsyncFd::with_interest( + InternalInterfaceStream::::new(unsafe { std::mem::transmute(self) })?, + tokio::io::Interest::READABLE, + )?, + }) + } +} + +struct InternalInterfaceStream { + interface: Interface, + fd: RawFd, +} + +impl InternalInterfaceStream { + fn new(interface: Interface) -> error::Result> { + let fd = unsafe { ffi::pcap_get_selectable_fd(interface.dev) }; + if fd == -1 { + return Err(error::Error::InvalidPcapFd); + } + Ok(Self { interface, fd }) + } +} + +impl AsRawFd for InternalInterfaceStream { + fn as_raw_fd(&self) -> RawFd { + self.fd + } +} + +pub struct InterfaceStream { + inner: AsyncFd>, +} + +impl InterfaceStream { + pub fn sendpacket(&mut self, packet: packets::EthernetPkt) -> error::Result<()> { + self.inner.get_mut().interface.sendpacket(packet) + } +} + +impl Unpin for InterfaceStream {} + +impl futures::Stream for InterfaceStream { + type Item = error::Result; + + fn poll_next(self: Pin<&mut Self>, cx: &mut task::Context) -> Poll> { + let stream = Pin::into_inner(self); + + loop { + let mut guard = ready!(stream.inner.poll_read_ready_mut(cx))?; + + match guard.try_io(|inner| match inner.get_mut().interface.next_packet() { + Ok(p) => Ok(Ok(p)), + Err(e) => Ok(Err(e)), + }) { + Ok(result) => { + return Poll::Ready(Some(result?)); + } + Err(_would_block) => continue, + } + } + } +} diff --git a/pcap-sys/src/packets.rs b/pcap-sys/src/packets.rs new file mode 100644 index 0000000..81a3ba5 --- /dev/null +++ b/pcap-sys/src/packets.rs @@ -0,0 +1,346 @@ +// Copyright (C) 2023 Andrew Rioux +// +// This program is free software: you can redistribute it and/or modify +// it under the terms of the GNU Affero General Public License as +// published by the Free Software Foundation, either version 3 of the +// License, or (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Affero General Public License for more details. +// +// You should have received a copy of the GNU Affero General Public License +// along with this program. If not, see . + +use crate::error; +use std::{ + net::Ipv4Addr, + sync::atomic::{AtomicU16, Ordering}, +}; + +pub struct EthernetPkt<'a> { + pub(crate) data: &'a [u8], +} + +impl<'a> EthernetPkt<'a> { + pub fn destination_address(&self) -> &[u8; 6] { + self.data[0..6].try_into().unwrap() + } + + pub fn source_address(&self) -> &[u8; 6] { + self.data[6..12].try_into().unwrap() + } + + pub fn ether_type(&self) -> u16 { + u16::from_be_bytes(self.data[12..14].try_into().unwrap()) + } + + pub fn get_layer3_pkt(&'_ self) -> error::Result> { + if self.data.len() < 14 { + return Err(error::Error::PacketLengthInvalid); + } + + match self.ether_type() { + 0x0800 => { + if self.data.len() < 34 { + return Err(error::Error::PacketLengthInvalid); + } + + let pkt = IPv4Pkt { + data: &self.data[14..], + }; + + if self.data.len() < (14 + pkt.total_length()).into() { + return Err(error::Error::PacketLengthInvalid); + } + + Ok(Layer3Pkt::IPv4Pkt(pkt)) + } + p => Err(error::Error::UnknownPacketType(p)), + } + } + + pub fn to_owned(&self) -> EthernetPacket { + EthernetPacket { + data: self.data.to_vec(), + } + } +} + +pub enum Layer3Pkt<'a> { + IPv4Pkt(IPv4Pkt<'a>), +} + +pub struct IPv4Pkt<'a> { + data: &'a [u8], +} + +impl<'a> IPv4Pkt<'a> { + pub fn version(&self) -> u8 { + 4 + } + + pub fn header_len(&self) -> u8 { + 4 * (0x0F & self.data[0]) + } + + pub fn type_of_service(&self) -> u8 { + self.data[1] >> 2 + } + + pub fn ecn(&self) -> u8 { + self.data[1] & 0x03 + } + + pub fn total_length(&self) -> u16 { + u16::from_be_bytes(self.data[2..4].try_into().unwrap()) + } + + pub fn id(&self) -> u16 { + u16::from_be_bytes(self.data[4..6].try_into().unwrap()) + } + + pub fn dont_fragment(&self) -> bool { + self.data[6] & 0x40 != 0 + } + + pub fn more_fragments(&self) -> bool { + self.data[6] & 0x80 != 0 + } + + pub fn fragment_offset(&self) -> u16 { + u16::from_be_bytes([self.data[6] & 0x1F, self.data[7]]) * 8 + } + + pub fn ttl(&self) -> u8 { + self.data[8] + } + + pub fn protocol(&self) -> u8 { + self.data[9] + } + + pub fn header_checksum(&self) -> u16 { + u16::from_be_bytes(self.data[10..12].try_into().unwrap()) + } + + pub fn source_ip(&self) -> Ipv4Addr { + <&[u8] as TryInto<[u8; 4]>>::try_into(&self.data[12..16]) + .unwrap() + .into() + } + + pub fn dest_ip(&self) -> Ipv4Addr { + <&[u8] as TryInto<[u8; 4]>>::try_into(&self.data[16..20]) + .unwrap() + .into() + } + + pub fn to_owned(&self) -> IPv4Packet { + IPv4Packet { + data: self.data.to_vec(), + } + } + + pub fn get_layer4_packet(&self) -> error::Result> { + match self.protocol() { + 17 => Ok(Layer4Pkt::UDP(UDPPkt { + data: &self.data[(self.header_len() as usize)..], + })), + p => Err(error::Error::UnknownPacketType(p.into())), + } + } +} + +pub enum Layer4Pkt<'a> { + UDP(UDPPkt<'a>), +} + +impl<'a> Layer4Pkt<'a> { + pub fn len(&self) -> u16 { + match self { + Layer4Pkt::UDP(pkt) => pkt.len(), + } + } + + pub fn is_empty(&self) -> bool { + self.len() == 0 + } +} + +pub struct UDPPkt<'a> { + data: &'a [u8], +} + +impl<'a> UDPPkt<'a> { + pub fn srcport(&self) -> u16 { + u16::from_be_bytes(self.data[0..2].try_into().unwrap()) + } + + pub fn dstport(&self) -> u16 { + u16::from_be_bytes(self.data[2..4].try_into().unwrap()) + } + + pub fn len(&self) -> u16 { + u16::from_be_bytes(self.data[4..6].try_into().unwrap()) + } + + pub fn is_empty(&self) -> bool { + self.len() == 0 + } + + pub fn to_owned(&self) -> UDPPacket { + UDPPacket { + data: self.data.to_vec(), + } + } + + pub fn get_data(&'_ self) -> &'_ [u8] { + &self.data[8..(self.len() as usize)] + } +} + +#[derive(Debug, Clone)] +pub struct EthernetPacket { + data: Vec, +} + +impl EthernetPacket { + pub fn construct(src: [u8; 6], dst: [u8; 6], packet: &Layer3Packet) -> EthernetPacket { + match packet { + Layer3Packet::IPv4(pkt) => EthernetPacket { + data: [&dst[..], &src[..], &[0x08_u8, 0x00_u8][..], &*pkt.data].concat(), + }, + } + } + + #[inline] + pub fn pkt(&'_ self) -> EthernetPkt<'_> { + EthernetPkt { data: &self.data } + } +} + +#[derive(Clone)] +pub enum Layer3Packet { + IPv4(IPv4Packet), +} + +static IPV4_ID: AtomicU16 = AtomicU16::new(0xabcd); + +#[derive(Clone)] +pub struct IPv4Packet { + data: Vec, +} + +impl IPv4Packet { + pub fn construct(source: I1, dest: I2, packet: &Layer4Packet) -> IPv4Packet + where + I1: Into, + I2: Into, + { + let source = source.into(); + let dest = dest.into(); + + let dscpen: u8 = 0; + + let totallen: u16 = 20 + packet.pkt().len(); + let id: u16 = IPV4_ID.fetch_add(1, Ordering::SeqCst); + + let fragmentation: u16 = 0x4000; + + let ttl: u8 = 64; + let protocol: u8 = match packet { + Layer4Packet::UDP(_) => 17, + }; + + let source_upper = u16::from_be_bytes(source.octets()[0..2].try_into().unwrap()); + let source_lower = u16::from_be_bytes(source.octets()[2..4].try_into().unwrap()); + let dest_upper = u16::from_be_bytes(dest.octets()[0..2].try_into().unwrap()); + let dest_lower = u16::from_be_bytes(dest.octets()[2..4].try_into().unwrap()); + + let versihldscpen = 0x4500 | dscpen as u16; + let ttlprotocol = ((ttl as u32) << 8_u8) | protocol as u32; + + let checksum_part: u32 = versihldscpen as u32 + + totallen as u32 + + id as u32 + + ttlprotocol + + fragmentation as u32 + + source_upper as u32 + + source_lower as u32 + + dest_upper as u32 + + dest_lower as u32; + + let checksum: u16 = ((checksum_part & 0xFFFF) + (checksum_part >> 16)) + .try_into() + .unwrap(); + + let checksum = 0xFFFF - checksum; + + let data = [ + &versihldscpen.to_be_bytes()[..], + &totallen.to_be_bytes(), + &id.to_be_bytes(), + &fragmentation.to_be_bytes(), + &[ttl, protocol], + &checksum.to_be_bytes(), + &source.octets(), + &dest.octets(), + match packet { + Layer4Packet::UDP(pkt) => &*pkt.data, + }, + ] + .concat(); + + IPv4Packet { data } + } + + #[inline] + pub fn pkt(&'_ self) -> IPv4Pkt<'_> { + IPv4Pkt { data: &self.data } + } +} + +#[derive(Clone)] +pub enum Layer4Packet { + UDP(UDPPacket), +} + +impl Layer4Packet { + pub fn pkt(&'_ self) -> Layer4Pkt<'_> { + match self { + Layer4Packet::UDP(pkt) => Layer4Pkt::UDP(pkt.pkt()), + } + } +} + +#[derive(Clone)] +pub struct UDPPacket { + data: Vec, +} + +impl UDPPacket { + pub fn construct(source: u16, dest: u16, data: T) -> UDPPacket + where + T: Into>, + { + let data = data.into(); + + UDPPacket { + data: [ + &source.to_be_bytes(), + &dest.to_be_bytes(), + &(8_u16 + TryInto::::try_into(data.len()).unwrap()).to_be_bytes(), + &[0_u8, 0_u8], + &*data, + ] + .concat(), + } + } + + #[inline] + pub fn pkt(&'_ self) -> UDPPkt<'_> { + UDPPkt { data: &self.data } + } +}