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Comparing rxvt-unicode/src/rxvtd.C (file contents):
Revision 1.33 by ayin, Wed Oct 31 09:55:24 2007 UTC vs.
Revision 1.66 by sf-exg, Sat Jun 26 14:44:30 2021 UTC

1/*----------------------------------------------------------------------* 1/*----------------------------------------------------------------------*
2 * File: rxvtd.C 2 * File: rxvtd.C
3 *----------------------------------------------------------------------* 3 *----------------------------------------------------------------------*
4 * 4 *
5 * All portions of code are copyright by their respective author/s. 5 * All portions of code are copyright by their respective author/s.
6 * Copyright (c) 2003-2006 Marc Lehmann <pcg@goof.com> 6 * Copyright (c) 2003-2007 Marc Lehmann <schmorp@schmorp.de>
7 * 7 *
8 * This program is free software; you can redistribute it and/or modify 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 9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or 10 * the Free Software Foundation; either version 3 of the License, or
11 * (at your option) any later version. 11 * (at your option) any later version.
12 * 12 *
13 * This program is distributed in the hope that it will be useful, 13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
… …
19 * along with this program; if not, write to the Free Software 19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 *----------------------------------------------------------------------*/ 21 *----------------------------------------------------------------------*/
22 22
23#include "../config.h" 23#include "../config.h"
24#include <cstdio> 24#include <stdio.h>
25#include <cstdlib> 25#include <stdlib.h>
26#include <cstdarg> 26#include <stdarg.h>
27#include <cstring> 27#include <string.h>
28 28
29#include <unistd.h> 29#include <unistd.h>
30#include <fcntl.h> 30#include <fcntl.h>
31#include <sys/types.h> 31#include <sys/types.h>
32#include <sys/stat.h> 32#include <sys/stat.h>
33#include <sys/socket.h> 33#include <sys/socket.h>
34#include <sys/un.h> 34#include <sys/un.h>
35 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
36#include <cerrno> 44#include <errno.h>
37 45
38#include "rxvt.h" 46#include "rxvt.h"
39#include "rxvtdaemon.h" 47#include "rxvtdaemon.h"
40#include "libptytty.h" 48#include "libptytty.h"
41#include "iom.h"
42 49
43struct server : rxvt_connection { 50struct server : rxvt_connection
51{
44 log_callback log_cb; 52 log_callback log_cb;
45 getfd_callback getfd_cb; 53 getfd_callback getfd_cb;
46 54
47 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;
48 void log_msg (const char *msg); 56 void log_msg (const char *msg);
49 int getfd (int remote_fd); 57 int getfd (int remote_fd);
50 58
51 server (int fd) 59 server (int fd)
52 : read_ev (this, &server::read_cb),
53 log_cb (this, &server::log_msg),
54 getfd_cb (this, &server::getfd)
55 { 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
56 this->fd = fd; 65 this->fd = fd;
66 fcntl (fd, F_SETFD, FD_CLOEXEC);
67 fcntl (fd, F_SETFL, 0);
57 read_ev.start (fd, EVENT_READ); 68 read_ev.start (fd, ev::READ);
58 } 69 }
59 70
60 void err (const char *format = 0, ...); 71 void err (const char *format = 0, ...);
61}; 72};
62 73
63struct unix_listener { 74struct unix_listener
75{
64 int fd; 76 int fd;
65 77
66 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;
67 79
80 unix_listener (int fd);
68 unix_listener (const char *sockname); 81 static int open (const char *sockname);
69}; 82};
70 83
84unix_listener::unix_listener (int fd) : fd (fd)
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
71unix_listener::unix_listener (const char *sockname) 92int unix_listener::open (const char *sockname)
72: accept_ev (this, &unix_listener::accept_cb)
73{ 93{
74 sockaddr_un sa; 94 sockaddr_un sa;
75 95
76 if (strlen (sockname) >= sizeof(sa.sun_path)) 96 if (strlen (sockname) >= sizeof(sa.sun_path))
77 { 97 {
78 fputs ("socket name too long, aborting.\n", stderr); 98 fputs ("socket name too long, aborting.\n", stderr);
79 exit (EXIT_FAILURE); 99 exit (EXIT_FAILURE);
80 } 100 }
81 101
102 int fd;
82 if ((fd = socket (AF_UNIX, SOCK_STREAM, 0)) < 0) 103 if ((fd = socket (AF_UNIX, SOCK_STREAM, 0)) < 0)
83 { 104 {
84 perror ("unable to create listening socket"); 105 perror ("unable to create listening socket");
85 exit (EXIT_FAILURE); 106 exit (EXIT_FAILURE);
86 } 107 }
87 108
88 fcntl (fd, F_SETFD, FD_CLOEXEC);
89
90 sa.sun_family = AF_UNIX; 109 sa.sun_family = AF_UNIX;
91 strcpy (sa.sun_path, sockname); 110 strcpy (sa.sun_path, sockname);
92 111
93 unlink (rxvt_connection::unix_sockname ()); 112 unlink (sockname);
94 113
95 mode_t omask = umask (0077); 114 mode_t omask = umask (0077);
96 115
97 if (bind (fd, (sockaddr *)&sa, sizeof (sa))) 116 if (bind (fd, (sockaddr *)&sa, sizeof (sa)))
98 { 117 {
… …
106 { 125 {
107 perror ("unable to listen on socket"); 126 perror ("unable to listen on socket");
108 exit (EXIT_FAILURE); 127 exit (EXIT_FAILURE);
109 } 128 }
110 129
111 accept_ev.start (fd, EVENT_READ); 130 return fd;
112} 131}
113 132
114void unix_listener::accept_cb (io_watcher &w, short revents) 133void unix_listener::accept_cb (ev::io &w, int revents)
115{ 134{
116 int fd2 = accept (fd, 0, 0); 135 int fd2 = accept (fd, 0, 0);
117 136
118 if (fd2 >= 0) 137 if (fd2 >= 0)
119 {
120 fcntl (fd2, F_SETFD, FD_CLOEXEC);
121 new server (fd2); 138 new server (fd2);
122 }
123} 139}
124 140
125int server::getfd (int remote_fd) 141int server::getfd (int remote_fd)
126{ 142{
127 send ("GETFD"); 143 send ("GETFD");
… …
151 send ("END"), send (0); 167 send ("END"), send (0);
152 close (fd); 168 close (fd);
153 delete this; 169 delete this;
154} 170}
155 171
156void server::read_cb (io_watcher &w, short revents) 172void server::read_cb (ev::io &w, int revents)
157{ 173{
158 auto_str tok; 174 auto_str tok;
159 175
160 if (recv (tok)) 176 if (recv (tok))
161 { 177 {
… …
171 187
172 if (!strcmp (tok, "END")) 188 if (!strcmp (tok, "END"))
173 break; 189 break;
174 else if (!strcmp (tok, "ENV") && recv (tok)) 190 else if (!strcmp (tok, "ENV") && recv (tok))
175 envv->push_back (strdup (tok)); 191 envv->push_back (strdup (tok));
176 else if (!strcmp (tok, "CWD") && recv (tok))
177 {
178 if (chdir (tok))
179 {
180 delete envv;
181 delete argv;
182 return err ("unable to change to working directory to '%s', aborting: %s.\n",
183 (char *)tok, strerror (errno));
184 }
185 }
186 else if (!strcmp (tok, "ARG") && recv (tok)) 192 else if (!strcmp (tok, "ARG") && recv (tok))
187 argv->push_back (strdup (tok)); 193 argv->push_back (strdup (tok));
188 else 194 else
189 return err ("protocol error: unexpected NEW token.\n"); 195 return err ("protocol error: unexpected NEW token.\n");
190 } 196 }
191 197
192 envv->push_back (0);
193
194 { 198 {
195 rxvt_term *term = new rxvt_term; 199 rxvt_term *term = new rxvt_term;
196 200
197 term->log_hook = &log_cb; 201 term->log_hook = &log_cb;
198 term->getfd_hook = &getfd_cb; 202 term->getfd_hook = &getfd_cb;
199 203
200 bool success; 204 bool success = true;
201 205
202 try 206 try
203 { 207 {
204 success = term->init (argv, envv); 208 term->init (argv, envv);
205 } 209 }
206 catch (const class rxvt_failure_exception &e) 210 catch (const std::exception &e)
207 { 211 {
212 log_msg (e.what());
208 success = false; 213 success = false;
209 } 214 }
210 215
211 term->log_hook = 0; 216 term->log_hook = 0;
212 217
213 chdir ("/"); 218 chdir ("/"); // init might change to different working directory
214 219
215 if (!success) 220 if (!success)
216 term->destroy (); 221 term->destroy ();
217 222
218 send ("END"); send (success ? 1 : 0); 223 send ("END"); send (success ? 1 : 0);
219 } 224 }
220 } 225 }
226 else if (!strcmp (tok, "QUIT"))
227 _exit (0);
221 else 228 else
222 return err ("protocol error: request '%s' unsupported.\n", (char *)tok); 229 return err ("protocol error: request '%s' unsupported.\n", (char *)tok);
223 } 230 }
224 else 231 else
225 return err (); 232 return err ();
226} 233}
227 234
228int opt_fork, opt_opendisplay, opt_quiet; 235#ifdef ENABLE_FRILLS
236enum {
237 SD_LISTEN_FDS_START = 3,
238};
239
240// https://www.freedesktop.org/software/systemd/man/sd_listen_fds.html
241// https://github.com/systemd/systemd/blob/main/src/libsystemd/sd-daemon/sd-daemon.c
242static int get_listen_fds ()
243{
244 const char *listen_pid = getenv ("LISTEN_PID");
245 if (!listen_pid)
246 return 0;
247
248 char *end;
249 errno = 0;
250 long pid = strtol (listen_pid, &end, 10);
251 if (errno || end == listen_pid || *end)
252 return -1;
253
254 if (getpid () != pid)
255 return 0;
256
257 const char *listen_fds = getenv ("LISTEN_FDS");
258 if (!listen_fds)
259 return 0;
260
261 errno = 0;
262 long n = strtol (listen_fds, &end, 10);
263 if (errno || end == listen_fds || *end)
264 return -1;
265
266 if (n <= 0 || n > INT_MAX - SD_LISTEN_FDS_START)
267 return -1;
268
269 unsetenv ("LISTEN_PID");
270 unsetenv ("LISTEN_FDS");
271 unsetenv ("LISTEN_FDNAMES");
272
273 return n;
274}
275#endif
229 276
230int 277int
231main (int argc, const char *const *argv) 278main (int argc, char *argv[])
232{ 279{
233 rxvt_init (); 280 try
281 {
282 ptytty::init ();
283 }
284 catch (const std::exception &e)
285 {
286 fputs (e.what (), stderr);
287 return EXIT_FAILURE;
288 }
289
290 static char opt_fork, opt_opendisplay, opt_quiet;
291#if ENABLE_PERL
292 static char *opt_eval;
293#endif
294#if ENABLE_MLOCK
295 static char opt_lock;
296#endif
234 297
235 for (int i = 1; i < argc; i++) 298 for (int i = 1; i < argc; i++)
236 { 299 {
237 if (!strcmp (argv [i], "-f") || !strcmp (argv [i], "--fork")) 300 if (!strcmp (argv [i], "-f") || !strcmp (argv [i], "--fork"))
238 opt_fork = 1; 301 opt_fork = 1;
239 else if (!strcmp (argv [i], "-o") || !strcmp (argv [i], "--opendisplay")) 302 else if (!strcmp (argv [i], "-o") || !strcmp (argv [i], "--opendisplay"))
240 opt_opendisplay = 1; 303 opt_opendisplay = 1;
241 else if (!strcmp (argv [i], "-q") || !strcmp (argv [i], "--quiet")) 304 else if (!strcmp (argv [i], "-q") || !strcmp (argv [i], "--quiet"))
242 opt_quiet = 1; 305 opt_quiet = 1;
306#if ENABLE_MLOCK
307 else if (!strcmp (argv [i], "-m") || !strcmp (argv [i], "--mlock"))
308 opt_lock = 1;
309#endif
310#if ENABLE_PERL
311 else if (!strcmp (argv [i], "-e") || !strcmp (argv [i], "--eval"))
312 opt_eval = argv [++i];
313#endif
243 else 314 else
244 { 315 {
245 rxvt_log ("%s: unknown option '%s', aborting.\n", argv [0], argv [i]); 316 rxvt_log ("%s: unknown option '%s', aborting.\n", argv [0], argv [i]);
246 return EXIT_FAILURE; 317 return EXIT_FAILURE;
247 } 318 }
248 } 319 }
249 320
321 rxvt_init ();
322
323#if ENABLE_PERL
324 if (opt_eval)
325 {
326 rxvt_perl.init ();
327 rxvt_perl.eval (opt_eval);
328 }
329#endif
330
331 // optionally open display and never release it.
332 if (opt_opendisplay)
333 if (const char *dpy = getenv ("DISPLAY"))
334 displays.get (dpy ? dpy : ":0"); // move string logic into rxvt_display maybe?
335
336 int fd;
337#ifdef ENABLE_FRILLS
338 int n = get_listen_fds ();
339 if (n > 1)
340 {
341 fputs ("received multiple file descriptors, aborting.\n", stderr);
342 exit (EXIT_FAILURE);
343 }
344 else if (n == 1)
345 {
346 fd = SD_LISTEN_FDS_START;
347 if (!opt_quiet)
348 {
349 printf ("rxvt-unicode daemon listening on fd.\n");
350 fflush (stdout);
351 }
352 }
353 else
354#endif
355 {
356 char *sockname = rxvt_connection::unix_sockname ();
357 fd = unix_listener::open (sockname);
358 if (!opt_quiet)
359 {
360 printf ("rxvt-unicode daemon listening on %s.\n", sockname);
361 fflush (stdout);
362 }
363 free (sockname);
364 }
365
366 unix_listener l (fd);
367
250 chdir ("/"); 368 chdir ("/");
251 369
252 if (opt_opendisplay) 370 pid_t pid = 0;
253 displays.get (getenv ("DISPLAY")); // open display and never release it
254
255 char *sockname = rxvt_connection::unix_sockname ();
256 unix_listener l (sockname);
257
258 if (!opt_quiet)
259 {
260 printf ("rxvt-unicode daemon listening on %s.\n", sockname);
261 fflush (stdout);
262 }
263
264 free (sockname);
265
266 if (opt_fork) 371 if (opt_fork)
267 { 372 {
268 pid_t pid = fork (); 373 pid = fork ();
374 }
269 375
376#if ENABLE_MLOCK
377 // Optionally perform an mlockall so this process does not get swapped out.
378 if (opt_lock && !pid)
379 if (mlockall (MCL_CURRENT | MCL_FUTURE) < 0)
380 perror ("unable to lock into ram");
381#endif
382
383 if (opt_fork)
384 {
270 if (pid < 0) 385 if (pid < 0)
271 { 386 {
272 rxvt_log ("unable to fork daemon, aborting.\n"); 387 rxvt_log ("unable to fork daemon, aborting.\n");
273 return EXIT_FAILURE; 388 return EXIT_FAILURE;
274 } 389 }
275 else if (pid > 0) 390 else if (pid > 0)
276 _exit (EXIT_SUCCESS); 391 _exit (EXIT_SUCCESS);
277 }
278 392
279 io_manager::loop (); 393 ev_loop_fork (EV_DEFAULT_UC);
394 }
395
396 ev_run ();
280 397
281 return EXIT_SUCCESS; 398 return EXIT_SUCCESS;
282} 399}
283 400

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