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/*----------------------------------------------------------------------* |
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* File: rxvtd.C |
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*----------------------------------------------------------------------* |
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* |
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* All portions of code are copyright by their respective author/s. |
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* Copyright (c) 2003-2007 Marc Lehmann <schmorp@schmorp.de> |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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*----------------------------------------------------------------------*/ |
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|
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#include "../config.h" |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <stdarg.h> |
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#include <string.h> |
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|
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#include <unistd.h> |
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#include <fcntl.h> |
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#include <sys/types.h> |
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#include <sys/stat.h> |
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#include <sys/socket.h> |
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#include <sys/un.h> |
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|
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#if defined(ENABLE_FRILLS) && defined(_POSIX_MEMLOCK) && _POSIX_MEMLOCK > 0 |
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# define ENABLE_MLOCK 1 |
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#endif |
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|
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#if ENABLE_MLOCK |
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# include <sys/mman.h> |
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#endif |
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|
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#include <errno.h> |
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|
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#include "rxvt.h" |
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#include "rxvtdaemon.h" |
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#include "libptytty.h" |
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|
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struct server : rxvt_connection |
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{ |
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log_callback log_cb; |
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getfd_callback getfd_cb; |
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|
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void read_cb (ev::io &w, int revents); ev::io read_ev; |
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void log_msg (const char *msg); |
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int getfd (int remote_fd); |
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|
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server (int fd) |
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{ |
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read_ev.set <server, &server::read_cb> (this); |
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log_cb.set <server, &server::log_msg> (this); |
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getfd_cb.set<server, &server::getfd> (this); |
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|
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this->fd = fd; |
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fcntl (fd, F_SETFD, FD_CLOEXEC); |
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fcntl (fd, F_SETFL, 0); |
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read_ev.start (fd, ev::READ); |
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} |
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|
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void err (const char *format = 0, ...); |
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}; |
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|
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struct unix_listener |
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{ |
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int fd; |
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|
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void accept_cb (ev::io &w, int revents); ev::io accept_ev; |
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|
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unix_listener (int fd); |
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static int open (const char *sockname); |
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}; |
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|
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unix_listener::unix_listener (int fd) : fd (fd) |
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{ |
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accept_ev.set<unix_listener, &unix_listener::accept_cb> (this); |
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fcntl (fd, F_SETFD, FD_CLOEXEC); |
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fcntl (fd, F_SETFL, O_NONBLOCK); |
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accept_ev.start (fd, ev::READ); |
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} |
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|
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int unix_listener::open (const char *sockname) |
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{ |
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sockaddr_un sa; |
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|
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if (strlen (sockname) >= sizeof(sa.sun_path)) |
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{ |
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fputs ("socket name too long, aborting.\n", stderr); |
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exit (EXIT_FAILURE); |
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} |
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|
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int fd; |
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if ((fd = socket (AF_UNIX, SOCK_STREAM, 0)) < 0) |
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{ |
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perror ("unable to create listening socket"); |
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exit (EXIT_FAILURE); |
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} |
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|
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sa.sun_family = AF_UNIX; |
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strcpy (sa.sun_path, sockname); |
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|
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unlink (sockname); |
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|
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mode_t omask = umask (0077); |
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|
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if (bind (fd, (sockaddr *)&sa, sizeof (sa))) |
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{ |
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perror ("unable to bind listening socket"); |
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exit (EXIT_FAILURE); |
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} |
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|
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umask (omask); |
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|
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if (listen (fd, 5)) |
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{ |
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perror ("unable to listen on socket"); |
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exit (EXIT_FAILURE); |
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} |
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|
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return fd; |
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} |
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|
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void unix_listener::accept_cb (ev::io &w, int revents) |
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{ |
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int fd2 = accept (fd, 0, 0); |
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|
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if (fd2 >= 0) |
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new server (fd2); |
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} |
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|
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int server::getfd (int remote_fd) |
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{ |
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send ("GETFD"); |
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send (remote_fd); |
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return ptytty::recv_fd (fd); |
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} |
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|
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void server::log_msg (const char *msg) |
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{ |
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send ("MSG"), send (msg); |
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} |
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|
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void server::err (const char *format, ...) |
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{ |
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if (format) |
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{ |
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char err[1024]; |
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|
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va_list ap; |
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va_start (ap, format); |
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vsnprintf (err, 1024, format, ap); |
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va_end (ap); |
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|
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log_msg (err); |
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} |
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|
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send ("END"), send (0); |
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close (fd); |
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delete this; |
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} |
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|
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void server::read_cb (ev::io &w, int revents) |
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{ |
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auto_str tok; |
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|
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if (recv (tok)) |
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{ |
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if (!strcmp (tok, "NEW")) |
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{ |
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stringvec *argv = new stringvec; |
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stringvec *envv = new stringvec; |
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|
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for (;;) |
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{ |
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if (!recv (tok)) |
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return err (); |
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|
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if (!strcmp (tok, "END")) |
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break; |
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else if (!strcmp (tok, "ENV") && recv (tok)) |
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envv->push_back (strdup (tok)); |
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else if (!strcmp (tok, "ARG") && recv (tok)) |
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argv->push_back (strdup (tok)); |
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else |
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return err ("protocol error: unexpected NEW token.\n"); |
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} |
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|
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{ |
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rxvt_term *term = new rxvt_term; |
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|
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term->log_hook = &log_cb; |
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term->getfd_hook = &getfd_cb; |
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|
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bool success = true; |
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|
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try |
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{ |
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term->init (argv, envv); |
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} |
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catch (const std::exception &e) |
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{ |
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log_msg (e.what()); |
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success = false; |
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} |
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|
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term->log_hook = 0; |
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|
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chdir ("/"); // init might change to different working directory |
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|
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if (!success) |
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term->destroy (); |
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|
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send ("END"); send (success ? 1 : 0); |
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} |
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} |
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else if (!strcmp (tok, "QUIT")) |
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_exit (0); |
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else |
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return err ("protocol error: request '%s' unsupported.\n", (char *)tok); |
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} |
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else |
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return err (); |
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} |
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|
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#ifdef ENABLE_FRILLS |
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enum { |
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SD_LISTEN_FDS_START = 3, |
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}; |
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|
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// https://www.freedesktop.org/software/systemd/man/sd_listen_fds.html |
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// https://github.com/systemd/systemd/blob/main/src/libsystemd/sd-daemon/sd-daemon.c |
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static int get_listen_fds () |
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{ |
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const char *listen_pid = getenv ("LISTEN_PID"); |
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if (!listen_pid) |
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return 0; |
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|
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char *end; |
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errno = 0; |
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long pid = strtol (listen_pid, &end, 10); |
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if (errno || end == listen_pid || *end) |
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return -1; |
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|
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if (getpid () != pid) |
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return 0; |
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|
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const char *listen_fds = getenv ("LISTEN_FDS"); |
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if (!listen_fds) |
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return 0; |
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|
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errno = 0; |
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long n = strtol (listen_fds, &end, 10); |
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if (errno || end == listen_fds || *end) |
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return -1; |
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|
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if (n <= 0 || n > INT_MAX - SD_LISTEN_FDS_START) |
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return -1; |
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|
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unsetenv ("LISTEN_PID"); |
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unsetenv ("LISTEN_FDS"); |
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unsetenv ("LISTEN_FDNAMES"); |
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|
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return n; |
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} |
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#endif |
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|
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int |
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main (int argc, char *argv[]) |
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{ |
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try |
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{ |
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ptytty::init (); |
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} |
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catch (const std::exception &e) |
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{ |
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fputs (e.what (), stderr); |
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return EXIT_FAILURE; |
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} |
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|
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static char opt_fork, opt_opendisplay, opt_quiet; |
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#if ENABLE_PERL |
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static char *opt_eval; |
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#endif |
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#if ENABLE_MLOCK |
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static char opt_lock; |
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#endif |
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|
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for (int i = 1; i < argc; i++) |
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{ |
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if (!strcmp (argv [i], "-f") || !strcmp (argv [i], "--fork")) |
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opt_fork = 1; |
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else if (!strcmp (argv [i], "-o") || !strcmp (argv [i], "--opendisplay")) |
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opt_opendisplay = 1; |
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else if (!strcmp (argv [i], "-q") || !strcmp (argv [i], "--quiet")) |
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opt_quiet = 1; |
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#if ENABLE_MLOCK |
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else if (!strcmp (argv [i], "-m") || !strcmp (argv [i], "--mlock")) |
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opt_lock = 1; |
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#endif |
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#if ENABLE_PERL |
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else if (!strcmp (argv [i], "-e") || !strcmp (argv [i], "--eval")) |
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opt_eval = argv [++i]; |
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#endif |
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else |
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{ |
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rxvt_log ("%s: unknown option '%s', aborting.\n", argv [0], argv [i]); |
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return EXIT_FAILURE; |
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} |
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} |
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|
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rxvt_init (); |
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|
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#if ENABLE_PERL |
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if (opt_eval) |
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{ |
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rxvt_perl.init (); |
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rxvt_perl.eval (opt_eval); |
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} |
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#endif |
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|
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// optionally open display and never release it. |
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if (opt_opendisplay) |
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if (const char *dpy = getenv ("DISPLAY")) |
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displays.get (dpy ? dpy : ":0"); // move string logic into rxvt_display maybe? |
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|
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int fd; |
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#ifdef ENABLE_FRILLS |
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int n = get_listen_fds (); |
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if (n > 1) |
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{ |
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fputs ("received multiple file descriptors, aborting.\n", stderr); |
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exit (EXIT_FAILURE); |
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} |
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else if (n == 1) |
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{ |
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fd = SD_LISTEN_FDS_START; |
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if (!opt_quiet) |
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{ |
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printf ("rxvt-unicode daemon listening on fd.\n"); |
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fflush (stdout); |
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} |
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} |
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else |
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#endif |
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{ |
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char *sockname = rxvt_connection::unix_sockname (); |
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fd = unix_listener::open (sockname); |
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if (!opt_quiet) |
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{ |
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printf ("rxvt-unicode daemon listening on %s.\n", sockname); |
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fflush (stdout); |
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} |
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free (sockname); |
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} |
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|
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unix_listener l (fd); |
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|
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chdir ("/"); |
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|
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pid_t pid = 0; |
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if (opt_fork) |
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{ |
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pid = fork (); |
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} |
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|
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#if ENABLE_MLOCK |
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// Optionally perform an mlockall so this process does not get swapped out. |
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if (opt_lock && !pid) |
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if (mlockall (MCL_CURRENT | MCL_FUTURE) < 0) |
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perror ("unable to lock into ram"); |
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#endif |
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|
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if (opt_fork) |
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{ |
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if (pid < 0) |
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{ |
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rxvt_log ("unable to fork daemon, aborting.\n"); |
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return EXIT_FAILURE; |
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} |
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else if (pid > 0) |
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_exit (EXIT_SUCCESS); |
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|
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ev_loop_fork (EV_DEFAULT_UC); |
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} |
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|
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ev_run (); |
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|
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return EXIT_SUCCESS; |
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} |
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|
