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Comparing rxvt-unicode/src/rxvtd.C (file contents):
Revision 1.2 by pcg, Mon Nov 24 19:52:16 2003 UTC vs.
Revision 1.65 by sf-exg, Sat Jun 26 14:42:36 2021 UTC

1#include "rxvtlib.h" 1/*----------------------------------------------------------------------*
2#include "rxvtdaemon.h" 2 * File: rxvtd.C
3#include "iom.h" 3 *----------------------------------------------------------------------*
4 *
5 * All portions of code are copyright by their respective author/s.
6 * Copyright (c) 2003-2007 Marc Lehmann <schmorp@schmorp.de>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 3 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 *----------------------------------------------------------------------*/
4 22
23#include "../config.h"
5#include <cstdio> 24#include <stdio.h>
6#include <cstdlib> 25#include <stdlib.h>
26#include <stdarg.h>
27#include <string.h>
7 28
8#include <unistd.h> 29#include <unistd.h>
30#include <fcntl.h>
31#include <sys/types.h>
32#include <sys/stat.h>
9#include <sys/socket.h> 33#include <sys/socket.h>
10#include <sys/un.h> 34#include <sys/un.h>
11 35
36#if defined(ENABLE_FRILLS) && defined(_POSIX_MEMLOCK) && _POSIX_MEMLOCK > 0
37# define ENABLE_MLOCK 1
38#endif
39
40#if ENABLE_MLOCK
41# include <sys/mman.h>
42#endif
43
44#include <errno.h>
45
46#include "rxvt.h"
47#include "rxvtdaemon.h"
48#include "libptytty.h"
49
12struct server : rxvt_connection { 50struct server : rxvt_connection
51{
52 log_callback log_cb;
53 getfd_callback getfd_cb;
54
13 void read_cb (io_watcher &w, short revents); io_watcher read_ev; 55 void read_cb (ev::io &w, int revents); ev::io read_ev;
56 void log_msg (const char *msg);
57 int getfd (int remote_fd);
14 58
15 server (int fd) 59 server (int fd)
16 : read_ev (this, &server::read_cb)
17 { 60 {
61 read_ev.set <server, &server::read_cb> (this);
62 log_cb.set <server, &server::log_msg> (this);
63 getfd_cb.set<server, &server::getfd> (this);
64
18 this->fd = fd; 65 this->fd = fd;
66 fcntl (fd, F_SETFD, FD_CLOEXEC);
67 fcntl (fd, F_SETFL, 0);
19 read_ev.start (fd, EVENT_READ); 68 read_ev.start (fd, ev::READ);
20 } 69 }
21 70
22 void err (); 71 void err (const char *format = 0, ...);
23}; 72};
24 73
25struct listener { 74struct unix_listener
75{
26 int fd; 76 int fd;
27 77
28 void accept_cb (io_watcher &w, short revents); io_watcher accept_ev; 78 void accept_cb (ev::io &w, int revents); ev::io accept_ev;
29 79
30 listener (); 80 unix_listener (int fd);
81 static int open (const char *sockname);
31}; 82};
32 83
33listener::listener () 84unix_listener::unix_listener (int fd) : fd (fd)
34: accept_ev (this, &listener::accept_cb)
35{ 85{
86 accept_ev.set<unix_listener, &unix_listener::accept_cb> (this);
87 fcntl (fd, F_SETFD, FD_CLOEXEC);
88 fcntl (fd, F_SETFL, O_NONBLOCK);
89 accept_ev.start (fd, ev::READ);
90}
91
92int unix_listener::open (const char *sockname)
93{
94 sockaddr_un sa;
95
96 if (strlen (sockname) >= sizeof(sa.sun_path))
97 {
98 fputs ("socket name too long, aborting.\n", stderr);
99 exit (EXIT_FAILURE);
100 }
101
102 int fd;
36 if ((fd = socket (PF_LOCAL, SOCK_STREAM, 0)) < 0) 103 if ((fd = socket (AF_UNIX, SOCK_STREAM, 0)) < 0)
37 { 104 {
38 perror ("unable to create listening socket"); 105 perror ("unable to create listening socket");
39 exit (EXIT_FAILURE); 106 exit (EXIT_FAILURE);
40 } 107 }
41 108
42 sockaddr_un sa;
43
44 sa.sun_family = AF_UNIX; 109 sa.sun_family = AF_UNIX;
45 strcpy (sa.sun_path, rxvt_connection::unix_sockname ()); 110 strcpy (sa.sun_path, sockname);
46 111
47 unlink (rxvt_connection::unix_sockname ()); 112 unlink (sockname);
113
114 mode_t omask = umask (0077);
48 115
49 if (bind (fd, (sockaddr *)&sa, sizeof (sa))) 116 if (bind (fd, (sockaddr *)&sa, sizeof (sa)))
50 { 117 {
51 perror ("unable to bind listening socket"); 118 perror ("unable to bind listening socket");
52 exit (EXIT_FAILURE); 119 exit (EXIT_FAILURE);
53 } 120 }
54 121
122 umask (omask);
123
55 if (listen (fd, 5)) 124 if (listen (fd, 5))
56 { 125 {
57 perror ("unable to listen on socket"); 126 perror ("unable to listen on socket");
58 exit (EXIT_FAILURE); 127 exit (EXIT_FAILURE);
59 } 128 }
60 129
61 accept_ev.start (fd, EVENT_READ); 130 return fd;
62} 131}
63 132
64void listener::accept_cb (io_watcher &w, short revents) 133void unix_listener::accept_cb (ev::io &w, int revents)
65{ 134{
66 int fd2 = accept (fd, 0, 0); 135 int fd2 = accept (fd, 0, 0);
67 136
68 if (fd2 >= 0) 137 if (fd2 >= 0)
69 new server (fd2); 138 new server (fd2);
70} 139}
71 140
72void server::err () 141int server::getfd (int remote_fd)
73{ 142{
143 send ("GETFD");
144 send (remote_fd);
145 return ptytty::recv_fd (fd);
146}
147
148void server::log_msg (const char *msg)
149{
150 send ("MSG"), send (msg);
151}
152
153void server::err (const char *format, ...)
154{
155 if (format)
156 {
157 char err[1024];
158
159 va_list ap;
160 va_start (ap, format);
161 vsnprintf (err, 1024, format, ap);
162 va_end (ap);
163
164 log_msg (err);
165 }
166
167 send ("END"), send (0);
74 close (fd); 168 close (fd);
75 delete this; 169 delete this;
76} 170}
77 171
78void server::read_cb (io_watcher &w, short revents) 172void server::read_cb (ev::io &w, int revents)
79{ 173{
80 auto_str tok; 174 auto_str tok;
81 175
82 if (recv (tok)) 176 if (recv (tok))
83 { 177 {
84 if (!strcmp (tok, "NEW")) 178 if (!strcmp (tok, "NEW"))
85 { 179 {
86 auto_str display, cwd; 180 stringvec *argv = new stringvec;
87 simplevec<auto_str> argv; 181 stringvec *envv = new stringvec;
88 182
89 for (;;) 183 for (;;)
90 { 184 {
91 if (!recv (tok)) 185 if (!recv (tok))
92 return err (); 186 return err ();
93 187
94 if (!strcmp (tok, "END")) 188 if (!strcmp (tok, "END"))
95 break; 189 break;
96 else if (!strcmp (tok, "DISPLAY") && recv (display))
97 ;
98 else if (!strcmp (tok, "CWD") && recv (cwd)) 190 else if (!strcmp (tok, "ENV") && recv (tok))
99 ; 191 envv->push_back (strdup (tok));
100 else if (!strcmp (tok, "ARG") && recv (tok)) 192 else if (!strcmp (tok, "ARG") && recv (tok))
101 argv.push_back (tok); 193 argv->push_back (strdup (tok));
102 else 194 else
103 return err (); 195 return err ("protocol error: unexpected NEW token.\n");
104 } 196 }
105 197
106 // TODO: no setenv, please
107 setenv ("DISPLAY", display.get (), 1);
108
109 rxvt_init (argv.size (), reinterpret_cast<char **>(argv.begin ()));
110 dR; 198 {
111 rxvt_main_loop (aR); 199 rxvt_term *term = new rxvt_term;
200
201 term->log_hook = &log_cb;
202 term->getfd_hook = &getfd_cb;
203
204 bool success = true;
205
206 try
207 {
208 term->init (argv, envv);
209 }
210 catch (const class rxvt_failure_exception &e)
211 {
212 success = false;
213 }
214 catch (const std::exception &e)
215 {
216 log_msg (e.what());
217 success = false;
218 }
219
220 term->log_hook = 0;
221
222 chdir ("/"); // init might change to different working directory
223
224 if (!success)
225 term->destroy ();
226
227 send ("END"); send (success ? 1 : 0);
228 }
112 } 229 }
230 else if (!strcmp (tok, "QUIT"))
231 _exit (0);
113 else 232 else
114 return err (); 233 return err ("protocol error: request '%s' unsupported.\n", (char *)tok);
115 } 234 }
116 else 235 else
117 return err (); 236 return err ();
118} 237}
119 238
239#ifdef ENABLE_FRILLS
240enum {
241 SD_LISTEN_FDS_START = 3,
242};
243
244// https://www.freedesktop.org/software/systemd/man/sd_listen_fds.html
245// https://github.com/systemd/systemd/blob/main/src/libsystemd/sd-daemon/sd-daemon.c
246static int get_listen_fds ()
247{
248 const char *listen_pid = getenv ("LISTEN_PID");
249 if (!listen_pid)
250 return 0;
251
252 char *end;
253 errno = 0;
254 long pid = strtol (listen_pid, &end, 10);
255 if (errno || end == listen_pid || *end)
256 return -1;
257
258 if (getpid () != pid)
259 return 0;
260
261 const char *listen_fds = getenv ("LISTEN_FDS");
262 if (!listen_fds)
263 return 0;
264
265 errno = 0;
266 long n = strtol (listen_fds, &end, 10);
267 if (errno || end == listen_fds || *end)
268 return -1;
269
270 if (n <= 0 || n > INT_MAX - SD_LISTEN_FDS_START)
271 return -1;
272
273 unsetenv ("LISTEN_PID");
274 unsetenv ("LISTEN_FDS");
275 unsetenv ("LISTEN_FDNAMES");
276
277 return n;
278}
279#endif
280
120int 281int
121main(int argc, const char *const *argv) 282main (int argc, char *argv[])
122{ 283{
123 listener l; 284 try
124 iom.loop (); 285 {
125 286 ptytty::init ();
126#if 0 287 }
127 if (rxvt_init(argc, argv) == NULL) 288 catch (const std::exception &e)
289 {
290 fputs (e.what (), stderr);
128 return EXIT_FAILURE; 291 return EXIT_FAILURE;
292 }
129 293
130 dR; 294 static char opt_fork, opt_opendisplay, opt_quiet;
131 rxvt_main_loop(aR); /* main processing loop */ 295#if ENABLE_PERL
296 static char *opt_eval;
132#endif 297#endif
298#if ENABLE_MLOCK
299 static char opt_lock;
300#endif
301
302 for (int i = 1; i < argc; i++)
303 {
304 if (!strcmp (argv [i], "-f") || !strcmp (argv [i], "--fork"))
305 opt_fork = 1;
306 else if (!strcmp (argv [i], "-o") || !strcmp (argv [i], "--opendisplay"))
307 opt_opendisplay = 1;
308 else if (!strcmp (argv [i], "-q") || !strcmp (argv [i], "--quiet"))
309 opt_quiet = 1;
310#if ENABLE_MLOCK
311 else if (!strcmp (argv [i], "-m") || !strcmp (argv [i], "--mlock"))
312 opt_lock = 1;
313#endif
314#if ENABLE_PERL
315 else if (!strcmp (argv [i], "-e") || !strcmp (argv [i], "--eval"))
316 opt_eval = argv [++i];
317#endif
318 else
319 {
320 rxvt_log ("%s: unknown option '%s', aborting.\n", argv [0], argv [i]);
321 return EXIT_FAILURE;
322 }
323 }
324
325 rxvt_init ();
326
327#if ENABLE_PERL
328 if (opt_eval)
329 {
330 rxvt_perl.init ();
331 rxvt_perl.eval (opt_eval);
332 }
333#endif
334
335 // optionally open display and never release it.
336 if (opt_opendisplay)
337 if (const char *dpy = getenv ("DISPLAY"))
338 displays.get (dpy ? dpy : ":0"); // move string logic into rxvt_display maybe?
339
340 int fd;
341#ifdef ENABLE_FRILLS
342 int n = get_listen_fds ();
343 if (n > 1)
344 {
345 fputs ("received multiple file descriptors, aborting.\n", stderr);
346 exit (EXIT_FAILURE);
347 }
348 else if (n == 1)
349 {
350 fd = SD_LISTEN_FDS_START;
351 if (!opt_quiet)
352 {
353 printf ("rxvt-unicode daemon listening on fd.\n");
354 fflush (stdout);
355 }
356 }
357 else
358#endif
359 {
360 char *sockname = rxvt_connection::unix_sockname ();
361 fd = unix_listener::open (sockname);
362 if (!opt_quiet)
363 {
364 printf ("rxvt-unicode daemon listening on %s.\n", sockname);
365 fflush (stdout);
366 }
367 free (sockname);
368 }
369
370 unix_listener l (fd);
371
372 chdir ("/");
373
374 pid_t pid = 0;
375 if (opt_fork)
376 {
377 pid = fork ();
378 }
379
380#if ENABLE_MLOCK
381 // Optionally perform an mlockall so this process does not get swapped out.
382 if (opt_lock && !pid)
383 if (mlockall (MCL_CURRENT | MCL_FUTURE) < 0)
384 perror ("unable to lock into ram");
385#endif
386
387 if (opt_fork)
388 {
389 if (pid < 0)
390 {
391 rxvt_log ("unable to fork daemon, aborting.\n");
392 return EXIT_FAILURE;
393 }
394 else if (pid > 0)
395 _exit (EXIT_SUCCESS);
396
397 ev_loop_fork (EV_DEFAULT_UC);
398 }
399
400 ev_run ();
401
133 return EXIT_SUCCESS; 402 return EXIT_SUCCESS;
134} 403}
404

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