423 lines
12 KiB
Rust
423 lines
12 KiB
Rust
use failure::*;
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use std::u32;
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use std::fs::OpenOptions;
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use std::io::{BufRead, BufReader};
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use std::collections::HashSet;
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use std::process;
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use std::net::{Ipv4Addr, Ipv6Addr};
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use crate::tools;
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use lazy_static::lazy_static;
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use regex::Regex;
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use libc;
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/// POSIX sysconf call
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pub fn sysconf(name: i32) -> i64 {
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extern { fn sysconf(name: i32) -> i64; }
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unsafe { sysconf(name) }
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}
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lazy_static! {
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static ref CLOCK_TICKS: f64 = sysconf(libc::_SC_CLK_TCK) as f64;
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}
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pub struct ProcFsPidStat {
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pub status: u8,
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pub utime: u64,
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pub stime: u64,
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pub starttime: u64,
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pub vsize: u64,
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pub rss: i64,
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}
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pub fn read_proc_pid_stat(pid: libc::pid_t) -> Result<ProcFsPidStat, Error> {
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let statstr = tools::file_read_firstline(format!("/proc/{}/stat", pid))?;
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lazy_static! {
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static ref REGEX: Regex = Regex::new(concat!(
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r"^(?P<pid>\d+) \(.*\) (?P<status>\S) -?\d+ -?\d+ -?\d+ -?\d+ -?\d+ \d+ \d+ \d+ \d+ \d+ ",
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r"(?P<utime>\d+) (?P<stime>\d+) -?\d+ -?\d+ -?\d+ -?\d+ -?\d+ 0 ",
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r"(?P<starttime>\d+) (?P<vsize>\d+) (?P<rss>-?\d+) ",
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r"\d+ \d+ \d+ \d+ \d+ \d+ \d+ \d+ \d+ \d+ \d+ \d+ \d+ -?\d+ -?\d+ \d+ \d+ \d+"
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)).unwrap();
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}
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if let Some(cap) = REGEX.captures(&statstr) {
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if pid != cap["pid"].parse::<i32>().unwrap() {
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bail!("unable to read pid stat for process '{}' - got wrong pid", pid);
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}
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return Ok(ProcFsPidStat {
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status: cap["status"].as_bytes()[0],
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utime: cap["utime"].parse::<u64>().unwrap(),
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stime: cap["stime"].parse::<u64>().unwrap(),
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starttime: cap["starttime"].parse::<u64>().unwrap(),
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vsize: cap["vsize"].parse::<u64>().unwrap(),
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rss: cap["rss"].parse::<i64>().unwrap() * 4096,
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});
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}
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bail!("unable to read pid stat for process '{}'", pid);
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}
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pub fn read_proc_starttime(pid: libc::pid_t) -> Result<u64, Error> {
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let info = read_proc_pid_stat(pid)?;
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Ok(info.starttime)
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}
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pub fn check_process_running(pid: libc::pid_t) -> Option<ProcFsPidStat> {
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if let Ok(info) = read_proc_pid_stat(pid) {
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if info.status != 'Z' as u8 {
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return Some(info);
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}
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}
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None
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}
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pub fn check_process_running_pstart(pid: libc::pid_t, pstart: u64) -> Option<ProcFsPidStat> {
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if let Some(info) = check_process_running(pid) {
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if info.starttime == pstart {
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return Some(info);
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}
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}
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None
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}
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pub fn read_proc_uptime() -> Result<(f64, f64), Error> {
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let path = "/proc/uptime";
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let line = tools::file_read_firstline(&path)?;
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let mut values = line.split_whitespace().map(|v| v.parse::<f64>());
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match (values.next(), values.next()) {
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(Some(Ok(up)), Some(Ok(idle))) => return Ok((up, idle)),
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_ => bail!("Error while parsing '{}'", path),
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}
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}
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pub fn read_proc_uptime_ticks() -> Result<(u64, u64), Error> {
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let (mut up, mut idle) = read_proc_uptime()?;
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up *= *CLOCK_TICKS;
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idle *= *CLOCK_TICKS;
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Ok((up as u64, idle as u64))
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}
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#[derive(Debug)]
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pub struct ProcFsMemInfo {
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pub memtotal: u64,
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pub memfree: u64,
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pub memused: u64,
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pub memshared: u64,
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pub swaptotal: u64,
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pub swapfree: u64,
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pub swapused: u64,
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}
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pub fn read_meminfo() -> Result<ProcFsMemInfo, Error> {
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let path = "/proc/meminfo";
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let file = OpenOptions::new().read(true).open(&path)?;
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let mut meminfo = ProcFsMemInfo {
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memtotal: 0,
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memfree: 0,
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memused: 0,
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memshared: 0,
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swaptotal: 0,
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swapfree: 0,
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swapused: 0,
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};
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let (mut buffers, mut cached) = (0, 0);
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for line in BufReader::new(&file).lines() {
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let content = line?;
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let mut content_iter = content.split_whitespace();
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if let (Some(key), Some(value)) = (content_iter.next(), content_iter.next()) {
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match key {
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"MemTotal:" => meminfo.memtotal = value.parse::<u64>()? * 1024,
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"MemFree:" => meminfo.memfree = value.parse::<u64>()? * 1024,
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"SwapTotal:" => meminfo.swaptotal = value.parse::<u64>()? * 1024,
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"SwapFree:" => meminfo.swapfree = value.parse::<u64>()? * 1024,
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"Buffers:" => buffers = value.parse::<u64>()? * 1024,
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"Cached:" => cached = value.parse::<u64>()? * 1024,
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_ => continue,
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}
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}
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}
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meminfo.memfree += buffers + cached;
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meminfo.memused = meminfo.memtotal - meminfo.memfree;
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meminfo.swapused = meminfo.swaptotal - meminfo.swapfree;
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let spages_line = tools::file_read_firstline("/sys/kernel/mm/ksm/pages_sharing")?;
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meminfo.memshared = spages_line.trim_end().parse::<u64>()? * 4096;
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Ok(meminfo)
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}
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#[derive(Clone, Debug)]
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pub struct ProcFsCPUInfo {
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pub user_hz: f64,
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pub mhz: f64,
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pub model: String,
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pub hvm: bool,
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pub sockets: usize,
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pub cpus: usize,
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}
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static CPU_INFO: Option<ProcFsCPUInfo> = None;
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pub fn read_cpuinfo() -> Result<ProcFsCPUInfo, Error> {
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if let Some(cpu_info) = &CPU_INFO { return Ok(cpu_info.clone()); }
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let path = "/proc/cpuinfo";
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let file = OpenOptions::new().read(true).open(&path)?;
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let mut cpuinfo = ProcFsCPUInfo {
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user_hz: *CLOCK_TICKS,
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mhz: 0.0,
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model: String::new(),
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hvm: false,
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sockets: 0,
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cpus: 0,
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};
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let mut socket_ids = HashSet::new();
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for line in BufReader::new(&file).lines() {
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let content = line?;
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if content.is_empty() { continue; }
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let mut content_iter = content.split(":");
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match (content_iter.next(), content_iter.next()) {
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(Some(key), Some(value)) => {
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match key.trim_end() {
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"processor" => cpuinfo.cpus += 1,
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"model name" => cpuinfo.model = value.trim().to_string(),
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"cpu MHz" => cpuinfo.mhz = value.trim().parse::<f64>()?,
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"flags" => cpuinfo.hvm = value.contains(" vmx ") || value.contains(" svm "),
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"physical id" => {
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let id = value.trim().parse::<u8>()?;
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socket_ids.insert(id);
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},
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_ => continue,
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}
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},
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_ => bail!("Error while parsing '{}'", path),
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}
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}
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cpuinfo.sockets = socket_ids.len();
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Ok(cpuinfo)
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}
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#[derive(Debug)]
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pub struct ProcFsMemUsage {
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pub size: u64,
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pub resident: u64,
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pub shared: u64,
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}
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pub fn read_memory_usage() -> Result<ProcFsMemUsage, Error> {
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let path = format!("/proc/{}/statm", process::id());
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let line = tools::file_read_firstline(&path)?;
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let mut values = line.split_whitespace().map(|v| v.parse::<u64>());
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let ps = 4096;
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match (values.next(), values.next(), values.next()) {
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(Some(Ok(size)), Some(Ok(resident)), Some(Ok(shared))) =>
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Ok(ProcFsMemUsage {
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size: size * ps,
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resident: resident * ps,
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shared: shared * ps,
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}),
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_ => bail!("Error while parsing '{}'", path),
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}
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}
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#[derive(Debug)]
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pub struct ProcFsNetDev {
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pub device: String,
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pub receive: u64,
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pub send: u64,
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}
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pub fn read_proc_net_dev() -> Result<Vec<ProcFsNetDev>, Error> {
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let path = "/proc/net/dev";
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let file = OpenOptions::new().read(true).open(&path)?;
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let mut result = Vec::new();
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for line in BufReader::new(&file).lines().skip(2) {
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let content = line?;
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let mut iter = content.split_whitespace();
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match (iter.next(), iter.next(), iter.skip(7).next()) {
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(Some(device), Some(receive), Some(send)) => {
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result.push(ProcFsNetDev {
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device: device[..device.len()-1].to_string(),
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receive: receive.parse::<u64>()?,
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send: send.parse::<u64>()?,
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});
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},
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_ => bail!("Error while parsing '{}'", path),
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}
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}
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Ok(result)
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}
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fn hex_nibble(c: u8) -> Result<u8, Error> {
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Ok(match c {
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b'0'..=b'9' => c - b'0',
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b'a'..=b'f' => c - b'a' + 0xa,
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b'A'..=b'F' => c - b'A' + 0xa,
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_ => bail!("not a hex digit: {}", c as char),
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})
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}
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fn hexstr_to_ipv4addr<T: AsRef<[u8]>>(hex: T) -> Result<Ipv4Addr, Error> {
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let hex = hex.as_ref();
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if hex.len() != 8 {
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bail!("Error while converting hex string to IPv4 address: unexpected string length");
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}
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let mut addr: [u8; 4] = unsafe { std::mem::uninitialized() };
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for i in 0..4 {
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addr[3 - i] = (hex_nibble(hex[i * 2])? << 4) + hex_nibble(hex[i * 2 + 1])?;
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}
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Ok(Ipv4Addr::from(addr))
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}
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#[derive(Debug)]
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pub struct ProcFsNetRoute {
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pub dest: Ipv4Addr,
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pub gateway: Ipv4Addr,
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pub mask: Ipv4Addr,
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pub metric: u32,
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pub mtu: u32,
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pub iface: String,
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}
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pub fn read_proc_net_route() -> Result<Vec<ProcFsNetRoute>, Error> {
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let path = "/proc/net/route";
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let file = OpenOptions::new().read(true).open(&path)?;
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let mut result = Vec::new();
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for line in BufReader::new(&file).lines().skip(1) {
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let content = line?;
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if content.is_empty() { continue; }
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let mut iter = content.split_whitespace();
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let mut next = || iter.next()
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.ok_or(format_err!("Error while parsing '{}'", path));
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let (iface, dest, gateway) = (next()?, next()?, next()?);
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for _ in 0..3 { next()?; }
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let (metric, mask, mtu) = (next()?, next()?, next()?);
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result.push(ProcFsNetRoute {
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dest: hexstr_to_ipv4addr(dest)?,
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gateway: hexstr_to_ipv4addr(gateway)?,
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mask: hexstr_to_ipv4addr(mask)?,
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metric: metric.parse()?,
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mtu: mtu.parse()?,
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iface: iface.to_string(),
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});
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}
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Ok(result)
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}
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fn hexstr_to_ipv6addr<T: AsRef<[u8]>>(hex: T) -> Result<Ipv6Addr, Error> {
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let hex = hex.as_ref();
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if hex.len() != 32 {
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bail!("Error while converting hex string to IPv6 address: unexpected string length");
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}
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let mut addr: [u8; 16] = unsafe { std::mem::uninitialized() };
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for i in 0..16 {
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addr[i] = (hex_nibble(hex[i * 2])? << 4) + hex_nibble(hex[i * 2 + 1])?;
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}
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Ok(Ipv6Addr::from(addr))
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}
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fn hexstr_to_u8<T: AsRef<[u8]>>(hex: T) -> Result<u8, Error> {
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let hex = hex.as_ref();
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if hex.len() != 2 {
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bail!("Error while converting hex string to u8: unexpected string length");
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}
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Ok((hex_nibble(hex[0])? << 4) + hex_nibble(hex[1])?)
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}
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fn hexstr_to_u32<T: AsRef<[u8]>>(hex: T) -> Result<u32, Error> {
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let hex = hex.as_ref();
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if hex.len() != 8 {
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bail!("Error while converting hex string to u32: unexpected string length");
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}
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let mut bytes: [u8; 4] = unsafe { std::mem::uninitialized() };
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for i in 0..4 {
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bytes[i] = (hex_nibble(hex[i * 2])? << 4) + hex_nibble(hex[i * 2 + 1])?;
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}
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Ok(u32::from_be_bytes(bytes))
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}
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#[derive(Debug)]
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pub struct ProcFsNetIPv6Route {
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pub dest: Ipv6Addr,
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pub prefix: u8,
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pub gateway: Ipv6Addr,
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pub metric: u32,
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pub iface: String,
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}
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pub fn read_proc_net_ipv6_route() -> Result<Vec<ProcFsNetIPv6Route>, Error> {
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let path = "/proc/net/ipv6_route";
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let file = OpenOptions::new().read(true).open(&path)?;
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let mut result = Vec::new();
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for line in BufReader::new(&file).lines() {
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let content = line?;
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if content.is_empty() { continue; }
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let mut iter = content.split_whitespace();
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let mut next = || iter.next()
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.ok_or_else(|| format_err!("Error while parsing '{}'", path));
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let (dest, prefix) = (next()?, next()?);
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for _ in 0..2 { next()?; }
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let (nexthop, metric) = (next()?, next()?);
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for _ in 0..3 { next()?; }
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let iface = next()?;
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result.push(ProcFsNetIPv6Route {
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dest: hexstr_to_ipv6addr(dest)?,
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prefix: hexstr_to_u8(prefix)?,
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gateway: hexstr_to_ipv6addr(nexthop)?,
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metric: hexstr_to_u32(metric)?,
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iface: iface.to_string(),
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});
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}
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Ok(result)
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_read_proc_net_route() {
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read_proc_net_route().unwrap();
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}
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#[test]
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fn test_read_proc_net_ipv6_route() {
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read_proc_net_ipv6_route().unwrap();
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}
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}
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