mirror of
https://github.com/house-of-vanity/rexec.git
synced 2025-07-06 16:44:08 +00:00
746 lines
24 KiB
Rust
746 lines
24 KiB
Rust
extern crate log;
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use std::collections::HashMap;
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use std::fs::read_to_string;
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use std::hash::Hash;
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use std::io::{BufRead, BufReader};
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use std::net::IpAddr;
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use std::process::{self, Command, Stdio};
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use std::sync::{Arc, Mutex};
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use std::thread;
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use clap::Parser;
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use colored::*;
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use dns_lookup::lookup_host;
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use env_logger::Env;
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use itertools::Itertools;
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use log::{error, info, warn};
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use massh::{MasshClient, MasshConfig, MasshHostConfig, SshAuth};
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use question::{Answer, Question};
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use rayon::prelude::*;
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use regex::Regex;
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// Define command-line arguments using the clap library
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#[derive(Parser, Debug)]
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#[command(author = "AB ab@hexor.ru", version, about = "Parallel SSH executor in Rust", long_about = None)]
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struct Args {
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/// Username for SSH connections (defaults to current system user)
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#[arg(short, long, default_value_t = whoami::username())]
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username: String,
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/// Flag to use known_hosts file for server discovery instead of pattern expansion
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#[arg(
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short,
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long,
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help = "Use known_hosts to build servers list instead of string expansion."
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)]
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known_hosts: bool,
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/// Server name patterns with expansion syntax
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/// Examples: 'web-[1:12]-io-{prod,dev}' expands to multiple servers
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#[arg(
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short,
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long,
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num_args = 1..,
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help = "Expression to build server list. List and range expansion are supported. Example: 'web-[1:12]-io-{prod,dev}'"
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)]
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expression: Vec<String>,
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/// Command to execute on each server
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#[arg(short, long, help = "Command to execute on servers")]
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command: String,
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/// Display only exit codes without command output
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#[arg(long, default_value_t = false, help = "Show exit code ONLY")]
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code: bool,
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/// Skip confirmation prompt before executing commands
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#[arg(
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short = 'f',
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long,
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default_value_t = false,
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help = "Don't ask for confirmation"
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)]
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noconfirm: bool,
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/// Maximum number of parallel SSH connections
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#[arg(short, long, default_value_t = 100)]
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parallel: i32,
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/// Use the embedded SSH client library instead of system SSH command
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#[arg(
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long,
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help = "Use embedded SSH client instead of system SSH. Does not support 'live output'.",
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default_value_t = false
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)]
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embedded_ssh: bool,
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}
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/// Host representation for both known_hosts entries and expanded patterns
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#[derive(Debug, Default, Clone, PartialEq, Eq, Hash)]
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struct Host {
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/// Hostname or IP address as a string
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name: String,
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/// Resolved IP address (if available)
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ip: Option<IpAddr>,
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}
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/// Find common domain suffix across all hostnames to simplify output display
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///
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/// This function analyzes all hostnames to identify a common domain suffix
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/// which can be shortened during display to improve readability.
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///
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/// # Arguments
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/// * `hostnames` - A slice of strings containing all server hostnames
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///
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/// # Returns
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/// * `Option<String>` - The common suffix if found, or None
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fn find_common_suffix(hostnames: &[String]) -> Option<String> {
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if hostnames.is_empty() {
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return None;
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}
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// Don't truncate if only one host
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if hostnames.len() == 1 {
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return None;
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}
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let first = &hostnames[0];
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// Start with assumption that the entire first hostname is the common suffix
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let mut common = first.clone();
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// Iterate through remaining hostnames, reducing the common part
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for hostname in hostnames.iter().skip(1) {
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// Exit early if no common part remains
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if common.is_empty() {
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return None;
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}
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// Find common suffix with current hostname
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let mut new_common = String::new();
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// Search for common suffix by comparing characters from right to left
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let mut common_chars = common.chars().rev();
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let mut hostname_chars = hostname.chars().rev();
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loop {
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match (common_chars.next(), hostname_chars.next()) {
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(Some(c1), Some(c2)) if c1 == c2 => new_common.insert(0, c1),
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_ => break,
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}
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}
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common = new_common;
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}
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// Ensure the common part is a valid domain suffix (starts with a dot)
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if common.is_empty() || !common.starts_with('.') {
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return None;
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}
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// Return the identified common suffix
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Some(common)
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}
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/// Shorten hostname by removing the common suffix and replacing with an asterisk
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///
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/// # Arguments
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/// * `hostname` - The original hostname
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/// * `common_suffix` - Optional common suffix to remove
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///
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/// # Returns
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/// * `String` - Shortened hostname or original if no common suffix
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fn shorten_hostname(hostname: &str, common_suffix: &Option<String>) -> String {
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match common_suffix {
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Some(suffix) if hostname.ends_with(suffix) => {
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let short_name = hostname[..hostname.len() - suffix.len()].to_string();
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format!("{}{}", short_name, "*")
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}
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_ => hostname.to_string(),
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}
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}
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/// Read and parse the SSH known_hosts file to extract server names
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///
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/// # Returns
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/// * `Vec<Host>` - List of hosts found in the known_hosts file
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fn read_known_hosts() -> Vec<Host> {
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let mut result: Vec<Host> = Vec::new();
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// Read known_hosts file from the user's home directory
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for line in read_to_string(format!("/home/{}/.ssh/known_hosts", whoami::username()))
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.unwrap()
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.lines()
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{
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let line = line.split(" ").collect::<Vec<&str>>();
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let hostname = line[0];
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result.push(Host {
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name: hostname.to_string(),
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ip: None,
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})
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}
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result
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}
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/// Expand a numeric range in the format [start:end] to a list of strings
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///
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/// # Arguments
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/// * `start` - Starting number (inclusive)
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/// * `end` - Ending number (inclusive)
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///
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/// # Returns
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/// * `Vec<String>` - List of numbers as strings
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fn expand_range(start: i32, end: i32) -> Vec<String> {
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(start..=end).map(|i| i.to_string()).collect()
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}
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/// Expand a comma-separated list in the format {item1,item2,item3} to a list of strings
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///
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/// # Arguments
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/// * `list` - Comma-separated string to expand
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///
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/// # Returns
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/// * `Vec<String>` - List of expanded items
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fn expand_list(list: &str) -> Vec<String> {
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list.split(',').map(|s| s.to_string()).collect()
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}
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/// Expand a server pattern string with range and list notation into individual hostnames
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///
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/// Supports two expansion types:
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/// - Range expansion: server-[1:5] → server-1, server-2, server-3, server-4, server-5
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/// - List expansion: server-{prod,dev} → server-prod, server-dev
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///
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/// # Arguments
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/// * `s` - Pattern string to expand
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///
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/// # Returns
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/// * `Vec<Host>` - List of expanded Host objects
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fn expand_string(s: &str) -> Vec<Host> {
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let mut hosts: Vec<Host> = Vec::new();
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let mut result = vec![s.to_string()];
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// First expand all range expressions [start:end]
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while let Some(r) = result.iter().find(|s| s.contains('[')) {
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let r = r.clone();
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let start = r.find('[').unwrap();
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let end = match r[start..].find(']') {
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None => {
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error!("Error parsing host expression. Wrong range expansion '[a:b]'");
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process::exit(1);
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}
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Some(s) => s + start,
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};
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let colon = match r[start..end].find(':') {
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None => {
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error!("Error parsing host expression. Missing colon in range expansion '[a:b]'");
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process::exit(1);
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}
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Some(c) => c + start,
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};
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let low = r[start + 1..colon].parse::<i32>().unwrap();
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let high = r[colon + 1..end].parse::<i32>().unwrap();
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result.retain(|s| s != &r);
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for val in expand_range(low, high) {
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let new_str = format!("{}{}{}", &r[..start], val, &r[end + 1..]);
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result.push(new_str);
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}
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}
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// Then expand all list expressions {item1,item2}
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while let Some(r) = result.iter().find(|s| s.contains('{')) {
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let r = r.clone();
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let start = r.find('{').unwrap();
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let end = match r.find('}') {
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None => {
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error!("Error parsing host expression. Wrong range expansion '{{one,two}}'");
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process::exit(1);
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}
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Some(s) => s,
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};
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let list = &r[start + 1..end];
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result.retain(|s| s != &r);
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for val in expand_list(list) {
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let new_str = format!("{}{}{}", &r[..start], val, &r[end + 1..]);
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result.push(new_str);
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}
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}
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// Convert all expanded strings to Host objects
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for hostname in result {
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hosts.push(Host {
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name: hostname.to_string(),
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ip: None,
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})
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}
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hosts
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}
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/// Execute a command on a single host using the system SSH client
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///
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/// This function runs an SSH command using the system's SSH client,
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/// capturing and displaying output in real-time with proper formatting.
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///
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/// # Arguments
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/// * `hostname` - Target server hostname
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/// * `username` - SSH username
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/// * `command` - Command to execute
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/// * `common_suffix` - Optional common suffix for hostname display formatting
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///
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/// # Returns
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/// * `Result<i32, String>` - Exit code on success or error message
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fn execute_ssh_command(
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hostname: &str,
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username: &str,
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command: &str,
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common_suffix: &Option<String>,
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) -> Result<i32, String> {
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let display_name = shorten_hostname(hostname, common_suffix);
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// Display execution start message with shortened hostname
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println!("\n{} - STARTED", display_name.yellow().bold());
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// Build the SSH command with appropriate options
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let mut ssh_cmd = Command::new("ssh");
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ssh_cmd
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.arg("-o")
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.arg("StrictHostKeyChecking=no")
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.arg("-o")
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.arg("BatchMode=yes")
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.arg(format!("{}@{}", username, hostname))
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.arg(command)
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.stdout(Stdio::piped())
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.stderr(Stdio::piped());
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// Execute the command
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let mut child = match ssh_cmd.spawn() {
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Ok(child) => child,
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Err(e) => return Err(format!("Failed to start SSH process: {}", e)),
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};
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// Capture and display stdout in real-time using a dedicated thread
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let stdout = child.stdout.take().unwrap();
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let display_name_stdout = display_name.clone();
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let stdout_thread = thread::spawn(move || {
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let reader = BufReader::new(stdout);
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let prefix = format!("{}", "│".green());
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for line in reader.lines() {
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match line {
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Ok(line) => println!("{} {} - {}", prefix, display_name_stdout.yellow(), line),
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Err(_) => break,
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}
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}
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});
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// Capture and display stderr in real-time using a dedicated thread
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let stderr = child.stderr.take().unwrap();
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let display_name_stderr = display_name.clone();
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let stderr_thread = thread::spawn(move || {
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let reader = BufReader::new(stderr);
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let prefix = format!("{}", "║".red());
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for line in reader.lines() {
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match line {
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Ok(line) => println!("{} {} - {}", prefix, display_name_stderr.yellow(), line),
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Err(_) => break,
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}
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}
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});
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// Wait for command to complete
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let status = match child.wait() {
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Ok(status) => status,
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Err(e) => return Err(format!("Failed to wait for SSH process: {}", e)),
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};
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// Wait for stdout and stderr threads to complete
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stdout_thread.join().unwrap();
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stderr_thread.join().unwrap();
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// Format exit code with color (green for success, red for failure)
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let exit_code = status.code().unwrap_or(-1);
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let code_string = if exit_code == 0 {
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format!("{}", exit_code.to_string().green())
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} else {
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format!("{}", exit_code.to_string().red())
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};
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// Display completion message
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println!(
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"{} - COMPLETED (Exit code: [{}])",
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display_name.yellow().bold(),
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code_string
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);
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Ok(exit_code)
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}
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/// Execute commands on multiple hosts using the massh library (embedded SSH)
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///
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/// This function handles batch processing of hosts to maintain the original order
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/// while executing commands in parallel using the massh library.
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///
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/// # Arguments
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/// * `hosts` - Vector of (hostname, IP address, original index) tuples
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/// * `username` - SSH username
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/// * `command` - Command to execute
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/// * `parallel` - Maximum number of parallel connections
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/// * `code_only` - Whether to display only exit codes
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/// * `common_suffix` - Optional common suffix for hostname display formatting
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fn execute_with_massh(
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hosts: &[(String, IpAddr, usize)],
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username: &str,
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command: &str,
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parallel: i32,
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code_only: bool,
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common_suffix: &Option<String>,
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) {
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// Create a lookup table for host data using IP addresses as keys
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let mut hosts_and_ips: HashMap<IpAddr, (String, usize)> = HashMap::new();
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let mut massh_hosts: Vec<MasshHostConfig> = Vec::new();
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for (hostname, ip, idx) in hosts {
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hosts_and_ips.insert(*ip, (hostname.clone(), *idx));
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massh_hosts.push(MasshHostConfig {
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addr: *ip,
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auth: None,
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port: None,
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user: None,
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});
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}
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// Process hosts in batches to respect parallelism setting while maintaining order
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let batch_size = parallel as usize;
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let mut processed = 0;
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while processed < massh_hosts.len() {
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let end = std::cmp::min(processed + batch_size, massh_hosts.len());
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// Create a new config and vector for this batch
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let mut batch_hosts = Vec::new();
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for host in &massh_hosts[processed..end] {
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batch_hosts.push(MasshHostConfig {
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addr: host.addr,
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auth: None,
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port: None,
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user: None,
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});
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}
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// Create a new MasshClient for this batch with appropriate configuration
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let batch_config = MasshConfig {
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default_auth: SshAuth::Agent,
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default_port: 22,
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default_user: username.to_string(),
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threads: batch_hosts.len() as u64,
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timeout: 0,
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hosts: batch_hosts,
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};
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let batch_massh = MasshClient::from(&batch_config);
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// Execute the command on all hosts in this batch
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let rx = batch_massh.execute(command.to_string());
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// Collect all results from this batch before moving to the next
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let mut batch_results = Vec::new();
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while let Ok((host, result)) = rx.recv() {
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// Extract IP address from the massh result
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let ip: String = host.split('@').collect::<Vec<_>>()[1]
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.split(':')
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.collect::<Vec<_>>()[0]
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.to_string();
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let ip = ip.parse::<IpAddr>().unwrap();
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// Lookup the original hostname and index
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if let Some((hostname, idx)) = hosts_and_ips.get(&ip) {
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batch_results.push((hostname.clone(), ip, result, *idx));
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} else {
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error!("Unexpected IP address in result: {}", ip);
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}
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}
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|
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// Sort results by original index to maintain consistent display order
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batch_results.sort_by_key(|(_, _, _, idx)| *idx);
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// Display results for each host in the batch
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for (hostname, _ip, result, _) in batch_results {
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let display_name = shorten_hostname(&hostname, common_suffix);
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// Display hostname with consistent formatting
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println!("\n{}", display_name.yellow().bold().to_string());
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|
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// Handle execution result
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let output = match result {
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Ok(output) => output,
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Err(e) => {
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error!("Can't access server: {}", e);
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continue;
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}
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};
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// Format exit code with color
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let code_string = if output.exit_status == 0 {
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format!("{}", output.exit_status.to_string().green())
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} else {
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format!("{}", output.exit_status.to_string().red())
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};
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|
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// Display summary of command execution
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println!(
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"{}",
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format!(
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"Exit code [{}] / stdout {} bytes / stderr {} bytes",
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code_string,
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output.stdout.len(),
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output.stderr.len()
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)
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.bold()
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);
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// Display command output if not in code-only mode
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if !code_only {
|
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// Display stdout with appropriate formatting
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match String::from_utf8(output.stdout) {
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Ok(stdout) => match stdout.as_str() {
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"" => {}
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_ => {
|
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let prefix = if output.exit_status != 0 {
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format!("{}", "│".cyan())
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} else {
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format!("{}", "│".green())
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};
|
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for line in stdout.lines() {
|
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println!("{} {} - {}", prefix, display_name.yellow(), line);
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}
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}
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},
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Err(_) => {}
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}
|
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// Display stderr with appropriate formatting
|
|
match String::from_utf8(output.stderr) {
|
|
Ok(stderr) => match stderr.as_str() {
|
|
"" => {}
|
|
_ => {
|
|
for line in stderr.lines() {
|
|
println!("{} {} - {}", "║".red(), display_name.yellow(), line);
|
|
}
|
|
}
|
|
},
|
|
Err(_) => {}
|
|
}
|
|
}
|
|
}
|
|
|
|
processed = end;
|
|
}
|
|
}
|
|
|
|
/// Main entry point for the application
|
|
fn main() {
|
|
// Initialize logging with minimal formatting (no timestamp, no target)
|
|
env_logger::Builder::from_env(Env::default().default_filter_or("info"))
|
|
.format_timestamp(None)
|
|
.format_target(false)
|
|
.init();
|
|
|
|
// Parse command-line arguments
|
|
let args = Args::parse();
|
|
|
|
// Build the list of target hosts based on user selection method
|
|
let hosts = if args.known_hosts {
|
|
// Use regex pattern matching against known_hosts file
|
|
info!("Using ~/.ssh/known_hosts to build server list.");
|
|
let known_hosts = read_known_hosts();
|
|
let mut all_hosts = Vec::new();
|
|
for expression in args.expression.iter() {
|
|
let re = match Regex::new(expression) {
|
|
Ok(result) => result,
|
|
Err(e) => {
|
|
error!("Error parsing regex. {}", e);
|
|
process::exit(1);
|
|
}
|
|
};
|
|
let matched: Vec<Host> = known_hosts
|
|
.clone()
|
|
.into_iter()
|
|
.filter(|r| re.is_match(&r.name.clone()))
|
|
.collect();
|
|
all_hosts.extend(matched);
|
|
}
|
|
all_hosts
|
|
} else {
|
|
// Use pattern expansion syntax (ranges and lists)
|
|
info!("Using string expansion to build server list.");
|
|
let mut all_hosts = Vec::new();
|
|
for expression in args.expression.iter() {
|
|
all_hosts.extend(expand_string(expression));
|
|
}
|
|
all_hosts
|
|
};
|
|
|
|
// Remove duplicate hosts while preserving original order
|
|
let matched_hosts: Vec<_> = hosts.into_iter().unique().collect();
|
|
|
|
// Log parallelism setting if not using the default
|
|
if args.parallel != 100 {
|
|
warn!("Parallelism: {} thread{}", &args.parallel, {
|
|
if args.parallel != 1 {
|
|
"s."
|
|
} else {
|
|
"."
|
|
}
|
|
});
|
|
}
|
|
|
|
// Store hosts with their original indices to preserve ordering
|
|
let mut host_with_indices: Vec<(Host, usize)> = Vec::new();
|
|
for (idx, host) in matched_hosts.iter().enumerate() {
|
|
host_with_indices.push((host.clone(), idx));
|
|
}
|
|
|
|
info!("Matched hosts:");
|
|
|
|
// Perform DNS resolution for all hosts in parallel
|
|
// Results are stored with original indices to maintain order
|
|
let resolved_ips_with_indices = Arc::new(Mutex::new(Vec::<(String, IpAddr, usize)>::new()));
|
|
|
|
host_with_indices
|
|
.par_iter()
|
|
.for_each(|(host, idx)| match lookup_host(&host.name) {
|
|
Ok(ips) if !ips.is_empty() => {
|
|
let ip = ips[0];
|
|
let mut results = resolved_ips_with_indices.lock().unwrap();
|
|
results.push((host.name.clone(), ip, *idx));
|
|
}
|
|
Ok(_) => {
|
|
let mut results = resolved_ips_with_indices.lock().unwrap();
|
|
results.push((
|
|
host.name.clone(),
|
|
IpAddr::V4(std::net::Ipv4Addr::new(0, 0, 0, 0)),
|
|
*idx,
|
|
));
|
|
}
|
|
Err(_) => {
|
|
let mut results = resolved_ips_with_indices.lock().unwrap();
|
|
results.push((
|
|
host.name.clone(),
|
|
IpAddr::V4(std::net::Ipv4Addr::new(0, 0, 0, 0)),
|
|
*idx,
|
|
));
|
|
}
|
|
});
|
|
|
|
// Sort hosts by original index to maintain consistent display order
|
|
let mut resolved_hosts = resolved_ips_with_indices.lock().unwrap().clone();
|
|
resolved_hosts.sort_by_key(|(_, _, idx)| *idx);
|
|
|
|
// Display all matched hosts with their resolved IPs
|
|
for (hostname, ip, _) in &resolved_hosts {
|
|
if ip.is_unspecified() {
|
|
error!("DNS resolve failed: {}", hostname.red());
|
|
} else {
|
|
info!("{} [{}]", hostname, ip);
|
|
}
|
|
}
|
|
|
|
// Filter out hosts that couldn't be resolved
|
|
let valid_hosts: Vec<(String, IpAddr, usize)> = resolved_hosts
|
|
.into_iter()
|
|
.filter(|(_, ip, _)| !ip.is_unspecified())
|
|
.collect();
|
|
|
|
// Exit if no valid hosts remain
|
|
if valid_hosts.is_empty() {
|
|
error!("No valid hosts to connect to");
|
|
process::exit(1);
|
|
}
|
|
|
|
// Find common domain suffix to optimize display
|
|
let hostnames: Vec<String> = valid_hosts
|
|
.iter()
|
|
.map(|(hostname, _, _)| hostname.clone())
|
|
.collect();
|
|
let common_suffix = find_common_suffix(&hostnames);
|
|
|
|
// Inform user about display optimization if common suffix found
|
|
if let Some(suffix) = &common_suffix {
|
|
info!(
|
|
"Common domain suffix found: '{}' (will be displayed as '*')",
|
|
suffix
|
|
);
|
|
}
|
|
|
|
// Ask for confirmation before proceeding (unless --noconfirm is specified)
|
|
if !args.noconfirm
|
|
&& match Question::new(&*format!(
|
|
"Continue on following {} servers?",
|
|
&valid_hosts.len()
|
|
))
|
|
.confirm()
|
|
{
|
|
Answer::YES => true,
|
|
Answer::NO => {
|
|
warn!("Stopped");
|
|
process::exit(0);
|
|
}
|
|
_ => unreachable!(),
|
|
}
|
|
{
|
|
info!("Run command on {} servers.", &valid_hosts.len());
|
|
}
|
|
|
|
// Execute commands using selected method (system SSH or embedded library)
|
|
if !args.embedded_ssh {
|
|
// Use system SSH client (default behavior)
|
|
let batch_size = args.parallel as usize;
|
|
let mut processed = 0;
|
|
|
|
while processed < valid_hosts.len() {
|
|
let end = std::cmp::min(processed + batch_size, valid_hosts.len());
|
|
let batch = &valid_hosts[processed..end];
|
|
|
|
// Create a thread for each host in the current batch
|
|
let mut handles = Vec::new();
|
|
|
|
for (hostname, _, _) in batch {
|
|
let hostname = hostname.clone();
|
|
let username = args.username.clone();
|
|
let command = args.command.clone();
|
|
let common_suffix_clone = common_suffix.clone();
|
|
|
|
// Execute SSH command in a separate thread
|
|
let handle = thread::spawn(move || {
|
|
match execute_ssh_command(&hostname, &username, &command, &common_suffix_clone)
|
|
{
|
|
Ok(_) => (),
|
|
Err(e) => error!("Error executing command on {}: {}", hostname, e),
|
|
}
|
|
});
|
|
|
|
handles.push(handle);
|
|
}
|
|
|
|
// Wait for all threads in this batch to complete
|
|
for handle in handles {
|
|
handle.join().unwrap();
|
|
}
|
|
|
|
processed = end;
|
|
}
|
|
} else {
|
|
// Use the embedded massh library implementation
|
|
execute_with_massh(
|
|
&valid_hosts,
|
|
&args.username,
|
|
&args.command,
|
|
args.parallel,
|
|
args.code,
|
|
&common_suffix,
|
|
);
|
|
}
|
|
}
|