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Comparing rxvt-unicode/src/rxvtd.C (file contents):
Revision 1.29 by root, Mon Feb 20 22:42:00 2006 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{
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;
74 if ((fd = socket (AF_UNIX, SOCK_STREAM, 0)) < 0) 103 if ((fd = socket (AF_UNIX, SOCK_STREAM, 0)) < 0)
75 { 104 {
76 perror ("unable to create listening socket"); 105 perror ("unable to create listening socket");
77 exit (EXIT_FAILURE); 106 exit (EXIT_FAILURE);
78 } 107 }
79 108
80 fcntl (fd, F_SETFD, FD_CLOEXEC);
81
82 sockaddr_un sa;
83
84 sa.sun_family = AF_UNIX; 109 sa.sun_family = AF_UNIX;
85 strcpy (sa.sun_path, sockname); 110 strcpy (sa.sun_path, sockname);
86 111
87 unlink (rxvt_connection::unix_sockname ()); 112 unlink (sockname);
88 113
89 mode_t omask = umask (0077); 114 mode_t omask = umask (0077);
90 115
91 if (bind (fd, (sockaddr *)&sa, sizeof (sa))) 116 if (bind (fd, (sockaddr *)&sa, sizeof (sa)))
92 { 117 {
… …
100 { 125 {
101 perror ("unable to listen on socket"); 126 perror ("unable to listen on socket");
102 exit (EXIT_FAILURE); 127 exit (EXIT_FAILURE);
103 } 128 }
104 129
105 accept_ev.start (fd, EVENT_READ); 130 return fd;
106} 131}
107 132
108void unix_listener::accept_cb (io_watcher &w, short revents) 133void unix_listener::accept_cb (ev::io &w, int revents)
109{ 134{
110 int fd2 = accept (fd, 0, 0); 135 int fd2 = accept (fd, 0, 0);
111 136
112 if (fd2 >= 0) 137 if (fd2 >= 0)
113 {
114 fcntl (fd2, F_SETFD, FD_CLOEXEC);
115 new server (fd2); 138 new server (fd2);
116 }
117} 139}
118 140
119int server::getfd (int remote_fd) 141int server::getfd (int remote_fd)
120{ 142{
121 send ("GETFD"); 143 send ("GETFD");
… …
137 va_list ap; 159 va_list ap;
138 va_start (ap, format); 160 va_start (ap, format);
139 vsnprintf (err, 1024, format, ap); 161 vsnprintf (err, 1024, format, ap);
140 va_end (ap); 162 va_end (ap);
141 163
142 send ("MSG"), send (err); 164 log_msg (err);
143 } 165 }
144 166
145 send ("END", 0); 167 send ("END"), send (0);
146 close (fd); 168 close (fd);
147 delete this; 169 delete this;
148} 170}
149 171
150void server::read_cb (io_watcher &w, short revents) 172void server::read_cb (ev::io &w, int revents)
151{ 173{
152 auto_str tok; 174 auto_str tok;
153 175
154 if (recv (tok)) 176 if (recv (tok))
155 { 177 {
156 if (!strcmp (tok, "NEW")) 178 if (!strcmp (tok, "NEW"))
157 { 179 {
158 stringvec *argv = new stringvec; 180 stringvec *argv = new stringvec;
159 stringvec *envv = new stringvec; 181 stringvec *envv = new stringvec;
160 182
161 for (;;) 183 for (;;)
162 { 184 {
163 if (!recv (tok)) 185 if (!recv (tok))
164 return err (); 186 return err ();
165 187
166 if (!strcmp (tok, "END")) 188 if (!strcmp (tok, "END"))
167 break; 189 break;
168 else if (!strcmp (tok, "ENV") && recv (tok)) 190 else if (!strcmp (tok, "ENV") && recv (tok))
169 envv->push_back (strdup (tok)); 191 envv->push_back (strdup (tok));
170 else if (!strcmp (tok, "CWD") && recv (tok))
171 {
172 if (chdir (tok))
173 err ("unable to change to working directory to '%s': %s",
174 (char *)tok, strerror (errno));
175 }
176 else if (!strcmp (tok, "ARG") && recv (tok)) 192 else if (!strcmp (tok, "ARG") && recv (tok))
177 argv->push_back (strdup (tok)); 193 argv->push_back (strdup (tok));
178 else 194 else
179 return err ("protocol error: unexpected NEW token"); 195 return err ("protocol error: unexpected NEW token.\n");
180 } 196 }
181
182 envv->push_back (0);
183 197
184 { 198 {
185 rxvt_term *term = new rxvt_term; 199 rxvt_term *term = new rxvt_term;
186 200
187 term->log_hook = &log_cb; 201 term->log_hook = &log_cb;
188 term->getfd_hook = &getfd_cb; 202 term->getfd_hook = &getfd_cb;
189 203
190 bool success; 204 bool success = true;
191 205
192 try 206 try
193 { 207 {
194 success = term->init (argv, envv); 208 term->init (argv, envv);
195 } 209 }
196 catch (const class rxvt_failure_exception &e) 210 catch (const std::exception &e)
197 { 211 {
212 log_msg (e.what());
198 success = false; 213 success = false;
199 } 214 }
200 215
201 term->log_hook = 0; 216 term->log_hook = 0;
202 217
203 chdir ("/"); 218 chdir ("/"); // init might change to different working directory
204 219
205 if (!success) 220 if (!success)
206 term->destroy (); 221 term->destroy ();
207 222
208 send ("END"); send (success ? 1 : 0); 223 send ("END"); send (success ? 1 : 0);
209 } 224 }
210 } 225 }
226 else if (!strcmp (tok, "QUIT"))
227 _exit (0);
211 else 228 else
212 return err ("protocol error: request '%s' unsupported.", (char *)tok); 229 return err ("protocol error: request '%s' unsupported.\n", (char *)tok);
213 } 230 }
214 else 231 else
215 return err (); 232 return err ();
216} 233}
217 234
218int 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
219 276
220int 277int
221main (int argc, const char *const *argv) 278main (int argc, char *argv[])
222{ 279{
223 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
224 297
225 for (int i = 1; i < argc; i++) 298 for (int i = 1; i < argc; i++)
226 { 299 {
227 if (!strcmp (argv [i], "-f") || !strcmp (argv [i], "--fork")) 300 if (!strcmp (argv [i], "-f") || !strcmp (argv [i], "--fork"))
228 opt_fork = 1; 301 opt_fork = 1;
229 else if (!strcmp (argv [i], "-o") || !strcmp (argv [i], "--opendisplay")) 302 else if (!strcmp (argv [i], "-o") || !strcmp (argv [i], "--opendisplay"))
230 opt_opendisplay = 1; 303 opt_opendisplay = 1;
231 else if (!strcmp (argv [i], "-q") || !strcmp (argv [i], "--quiet")) 304 else if (!strcmp (argv [i], "-q") || !strcmp (argv [i], "--quiet"))
232 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
233 else 314 else
234 { 315 {
235 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]);
236 return EXIT_FAILURE; 317 return EXIT_FAILURE;
237 } 318 }
238 } 319 }
239 320
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
240 chdir ("/"); 368 chdir ("/");
241 369
242 if (opt_opendisplay) 370 pid_t pid = 0;
243 displays.get (getenv ("DISPLAY")); // open display and never release it
244
245 char *sockname = rxvt_connection::unix_sockname ();
246 unix_listener l (sockname);
247
248 if (!opt_quiet)
249 {
250 printf ("rxvt-unicode daemon listening on %s.\n", sockname);
251 fflush (stdout);
252 }
253
254 free (sockname);
255
256 if (opt_fork) 371 if (opt_fork)
257 { 372 {
258 pid_t pid = fork (); 373 pid = fork ();
374 }
259 375
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 {
260 if (pid < 0) 385 if (pid < 0)
261 { 386 {
262 rxvt_log ("unable to fork daemon, aborting.\n"); 387 rxvt_log ("unable to fork daemon, aborting.\n");
263 return EXIT_FAILURE; 388 return EXIT_FAILURE;
264 } 389 }
265 else if (pid > 0) 390 else if (pid > 0)
266 _exit (EXIT_SUCCESS); 391 _exit (EXIT_SUCCESS);
267 }
268 392
269 io_manager::loop (); 393 ev_loop_fork (EV_DEFAULT_UC);
394 }
395
396 ev_run ();
270 397
271 return EXIT_SUCCESS; 398 return EXIT_SUCCESS;
272} 399}
273 400

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