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Comparing rxvt-unicode/src/rxvtd.C (file contents):
Revision 1.30 by root, Wed Aug 9 22:01:07 2006 UTC vs.
Revision 1.67 by sf-exg, Fri Jul 23 19:18:52 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>
45
46#include <libptytty.h>
37 47
38#include "rxvt.h" 48#include "rxvt.h"
39#include "rxvtdaemon.h" 49#include "rxvtdaemon.h"
40#include "libptytty.h"
41#include "iom.h"
42 50
43struct server : rxvt_connection { 51struct server : rxvt_connection
52{
44 log_callback log_cb; 53 log_callback log_cb;
45 getfd_callback getfd_cb; 54 getfd_callback getfd_cb;
46 55
47 void read_cb (io_watcher &w, short revents); io_watcher read_ev; 56 void read_cb (ev::io &w, int revents); ev::io read_ev;
48 void log_msg (const char *msg); 57 void log_msg (const char *msg);
49 int getfd (int remote_fd); 58 int getfd (int remote_fd);
50 59
51 server (int fd) 60 server (int fd)
52 : read_ev (this, &server::read_cb),
53 log_cb (this, &server::log_msg),
54 getfd_cb (this, &server::getfd)
55 { 61 {
62 read_ev.set <server, &server::read_cb> (this);
63 log_cb.set <server, &server::log_msg> (this);
64 getfd_cb.set<server, &server::getfd> (this);
65
56 this->fd = fd; 66 this->fd = fd;
67 fcntl (fd, F_SETFD, FD_CLOEXEC);
68 fcntl (fd, F_SETFL, 0);
57 read_ev.start (fd, EVENT_READ); 69 read_ev.start (fd, ev::READ);
58 } 70 }
59 71
60 void err (const char *format = 0, ...); 72 void err (const char *format = 0, ...);
61}; 73};
62 74
63struct unix_listener { 75struct unix_listener
76{
64 int fd; 77 int fd;
65 78
66 void accept_cb (io_watcher &w, short revents); io_watcher accept_ev; 79 void accept_cb (ev::io &w, int revents); ev::io accept_ev;
67 80
81 unix_listener (int fd);
68 unix_listener (const char *sockname); 82 static int open (const char *sockname);
69}; 83};
70 84
85unix_listener::unix_listener (int fd) : fd (fd)
86{
87 accept_ev.set<unix_listener, &unix_listener::accept_cb> (this);
88 fcntl (fd, F_SETFD, FD_CLOEXEC);
89 fcntl (fd, F_SETFL, O_NONBLOCK);
90 accept_ev.start (fd, ev::READ);
91}
92
71unix_listener::unix_listener (const char *sockname) 93int unix_listener::open (const char *sockname)
72: accept_ev (this, &unix_listener::accept_cb)
73{ 94{
74 sockaddr_un sa; 95 sockaddr_un sa;
75 96
76 if (strlen(sockname) >= sizeof(sa.sun_path)) 97 if (strlen (sockname) >= sizeof(sa.sun_path))
98 {
77 rxvt_fatal ("socket name too long, aborting.\n"); 99 fputs ("socket name too long, aborting.\n", stderr);
100 exit (EXIT_FAILURE);
101 }
78 102
103 int fd;
79 if ((fd = socket (AF_UNIX, SOCK_STREAM, 0)) < 0) 104 if ((fd = socket (AF_UNIX, SOCK_STREAM, 0)) < 0)
80 { 105 {
81 perror ("unable to create listening socket"); 106 perror ("unable to create listening socket");
82 exit (EXIT_FAILURE); 107 exit (EXIT_FAILURE);
83 } 108 }
84 109
85 fcntl (fd, F_SETFD, FD_CLOEXEC);
86
87 sa.sun_family = AF_UNIX; 110 sa.sun_family = AF_UNIX;
88 strcpy (sa.sun_path, sockname); 111 strcpy (sa.sun_path, sockname);
89 112
90 unlink (rxvt_connection::unix_sockname ()); 113 unlink (sockname);
91 114
92 mode_t omask = umask (0077); 115 mode_t omask = umask (0077);
93 116
94 if (bind (fd, (sockaddr *)&sa, sizeof (sa))) 117 if (bind (fd, (sockaddr *)&sa, sizeof (sa)))
95 { 118 {
… …
103 { 126 {
104 perror ("unable to listen on socket"); 127 perror ("unable to listen on socket");
105 exit (EXIT_FAILURE); 128 exit (EXIT_FAILURE);
106 } 129 }
107 130
108 accept_ev.start (fd, EVENT_READ); 131 return fd;
109} 132}
110 133
111void unix_listener::accept_cb (io_watcher &w, short revents) 134void unix_listener::accept_cb (ev::io &w, int revents)
112{ 135{
113 int fd2 = accept (fd, 0, 0); 136 int fd2 = accept (fd, 0, 0);
114 137
115 if (fd2 >= 0) 138 if (fd2 >= 0)
116 {
117 fcntl (fd2, F_SETFD, FD_CLOEXEC);
118 new server (fd2); 139 new server (fd2);
119 }
120} 140}
121 141
122int server::getfd (int remote_fd) 142int server::getfd (int remote_fd)
123{ 143{
124 send ("GETFD"); 144 send ("GETFD");
… …
140 va_list ap; 160 va_list ap;
141 va_start (ap, format); 161 va_start (ap, format);
142 vsnprintf (err, 1024, format, ap); 162 vsnprintf (err, 1024, format, ap);
143 va_end (ap); 163 va_end (ap);
144 164
145 send ("MSG"), send (err); 165 log_msg (err);
146 } 166 }
147 167
148 send ("END", 0); 168 send ("END"), send (0);
149 close (fd); 169 close (fd);
150 delete this; 170 delete this;
151} 171}
152 172
153void server::read_cb (io_watcher &w, short revents) 173void server::read_cb (ev::io &w, int revents)
154{ 174{
155 auto_str tok; 175 auto_str tok;
156 176
157 if (recv (tok)) 177 if (recv (tok))
158 { 178 {
159 if (!strcmp (tok, "NEW")) 179 if (!strcmp (tok, "NEW"))
160 { 180 {
161 stringvec *argv = new stringvec; 181 stringvec *argv = new stringvec;
162 stringvec *envv = new stringvec; 182 stringvec *envv = new stringvec;
163 183
164 for (;;) 184 for (;;)
165 { 185 {
166 if (!recv (tok)) 186 if (!recv (tok))
167 return err (); 187 return err ();
168 188
169 if (!strcmp (tok, "END")) 189 if (!strcmp (tok, "END"))
170 break; 190 break;
171 else if (!strcmp (tok, "ENV") && recv (tok)) 191 else if (!strcmp (tok, "ENV") && recv (tok))
172 envv->push_back (strdup (tok)); 192 envv->push_back (strdup (tok));
173 else if (!strcmp (tok, "CWD") && recv (tok))
174 {
175 if (chdir (tok))
176 err ("unable to change to working directory to '%s': %s",
177 (char *)tok, strerror (errno));
178 }
179 else if (!strcmp (tok, "ARG") && recv (tok)) 193 else if (!strcmp (tok, "ARG") && recv (tok))
180 argv->push_back (strdup (tok)); 194 argv->push_back (strdup (tok));
181 else 195 else
182 return err ("protocol error: unexpected NEW token"); 196 return err ("protocol error: unexpected NEW token.\n");
183 } 197 }
184
185 envv->push_back (0);
186 198
187 { 199 {
188 rxvt_term *term = new rxvt_term; 200 rxvt_term *term = new rxvt_term;
189 201
190 term->log_hook = &log_cb; 202 term->log_hook = &log_cb;
191 term->getfd_hook = &getfd_cb; 203 term->getfd_hook = &getfd_cb;
192 204
193 bool success; 205 bool success = true;
194 206
195 try 207 try
196 { 208 {
197 success = term->init (argv, envv); 209 term->init (argv, envv);
198 } 210 }
199 catch (const class rxvt_failure_exception &e) 211 catch (const std::exception &e)
200 { 212 {
213 log_msg (e.what());
201 success = false; 214 success = false;
202 } 215 }
203 216
204 term->log_hook = 0; 217 term->log_hook = 0;
205 218
206 chdir ("/"); 219 chdir ("/"); // init might change to different working directory
207 220
208 if (!success) 221 if (!success)
209 term->destroy (); 222 term->destroy ();
210 223
211 send ("END"); send (success ? 1 : 0); 224 send ("END"); send (success ? 1 : 0);
212 } 225 }
213 } 226 }
227 else if (!strcmp (tok, "QUIT"))
228 _exit (0);
214 else 229 else
215 return err ("protocol error: request '%s' unsupported.", (char *)tok); 230 return err ("protocol error: request '%s' unsupported.\n", (char *)tok);
216 } 231 }
217 else 232 else
218 return err (); 233 return err ();
219} 234}
220 235
221int opt_fork, opt_opendisplay, opt_quiet; 236#ifdef ENABLE_FRILLS
237enum {
238 SD_LISTEN_FDS_START = 3,
239};
240
241// https://www.freedesktop.org/software/systemd/man/sd_listen_fds.html
242// https://github.com/systemd/systemd/blob/main/src/libsystemd/sd-daemon/sd-daemon.c
243static int get_listen_fds ()
244{
245 const char *listen_pid = getenv ("LISTEN_PID");
246 if (!listen_pid)
247 return 0;
248
249 char *end;
250 errno = 0;
251 long pid = strtol (listen_pid, &end, 10);
252 if (errno || end == listen_pid || *end)
253 return -1;
254
255 if (getpid () != pid)
256 return 0;
257
258 const char *listen_fds = getenv ("LISTEN_FDS");
259 if (!listen_fds)
260 return 0;
261
262 errno = 0;
263 long n = strtol (listen_fds, &end, 10);
264 if (errno || end == listen_fds || *end)
265 return -1;
266
267 if (n <= 0 || n > INT_MAX - SD_LISTEN_FDS_START)
268 return -1;
269
270 unsetenv ("LISTEN_PID");
271 unsetenv ("LISTEN_FDS");
272 unsetenv ("LISTEN_FDNAMES");
273
274 return n;
275}
276#endif
222 277
223int 278int
224main (int argc, const char *const *argv) 279main (int argc, char *argv[])
225{ 280{
226 rxvt_init (); 281 try
282 {
283 ptytty::init ();
284 }
285 catch (const std::exception &e)
286 {
287 fputs (e.what (), stderr);
288 return EXIT_FAILURE;
289 }
290
291 static char opt_fork, opt_opendisplay, opt_quiet;
292#if ENABLE_PERL
293 static char *opt_eval;
294#endif
295#if ENABLE_MLOCK
296 static char opt_lock;
297#endif
227 298
228 for (int i = 1; i < argc; i++) 299 for (int i = 1; i < argc; i++)
229 { 300 {
230 if (!strcmp (argv [i], "-f") || !strcmp (argv [i], "--fork")) 301 if (!strcmp (argv [i], "-f") || !strcmp (argv [i], "--fork"))
231 opt_fork = 1; 302 opt_fork = 1;
232 else if (!strcmp (argv [i], "-o") || !strcmp (argv [i], "--opendisplay")) 303 else if (!strcmp (argv [i], "-o") || !strcmp (argv [i], "--opendisplay"))
233 opt_opendisplay = 1; 304 opt_opendisplay = 1;
234 else if (!strcmp (argv [i], "-q") || !strcmp (argv [i], "--quiet")) 305 else if (!strcmp (argv [i], "-q") || !strcmp (argv [i], "--quiet"))
235 opt_quiet = 1; 306 opt_quiet = 1;
307#if ENABLE_MLOCK
308 else if (!strcmp (argv [i], "-m") || !strcmp (argv [i], "--mlock"))
309 opt_lock = 1;
310#endif
311#if ENABLE_PERL
312 else if (!strcmp (argv [i], "-e") || !strcmp (argv [i], "--eval"))
313 opt_eval = argv [++i];
314#endif
236 else 315 else
237 { 316 {
238 rxvt_log ("%s: unknown option '%s', aborting.\n", argv [0], argv [i]); 317 rxvt_log ("%s: unknown option '%s', aborting.\n", argv [0], argv [i]);
239 return EXIT_FAILURE; 318 return EXIT_FAILURE;
240 } 319 }
241 } 320 }
242 321
322 rxvt_init ();
323
324#if ENABLE_PERL
325 if (opt_eval)
326 {
327 rxvt_perl.init ();
328 rxvt_perl.eval (opt_eval);
329 }
330#endif
331
332 // optionally open display and never release it.
333 if (opt_opendisplay)
334 if (const char *dpy = getenv ("DISPLAY"))
335 displays.get (dpy ? dpy : ":0"); // move string logic into rxvt_display maybe?
336
337 int fd;
338#ifdef ENABLE_FRILLS
339 int n = get_listen_fds ();
340 if (n > 1)
341 {
342 fputs ("received multiple file descriptors, aborting.\n", stderr);
343 exit (EXIT_FAILURE);
344 }
345 else if (n == 1)
346 {
347 fd = SD_LISTEN_FDS_START;
348 if (!opt_quiet)
349 {
350 printf ("rxvt-unicode daemon listening on fd.\n");
351 fflush (stdout);
352 }
353 }
354 else
355#endif
356 {
357 char *sockname = rxvt_connection::unix_sockname ();
358 fd = unix_listener::open (sockname);
359 if (!opt_quiet)
360 {
361 printf ("rxvt-unicode daemon listening on %s.\n", sockname);
362 fflush (stdout);
363 }
364 free (sockname);
365 }
366
367 unix_listener l (fd);
368
243 chdir ("/"); 369 chdir ("/");
244 370
245 if (opt_opendisplay) 371 pid_t pid = 0;
246 displays.get (getenv ("DISPLAY")); // open display and never release it
247
248 char *sockname = rxvt_connection::unix_sockname ();
249 unix_listener l (sockname);
250
251 if (!opt_quiet)
252 {
253 printf ("rxvt-unicode daemon listening on %s.\n", sockname);
254 fflush (stdout);
255 }
256
257 free (sockname);
258
259 if (opt_fork) 372 if (opt_fork)
260 { 373 {
261 pid_t pid = fork (); 374 pid = fork ();
375 }
262 376
377#if ENABLE_MLOCK
378 // Optionally perform an mlockall so this process does not get swapped out.
379 if (opt_lock && !pid)
380 if (mlockall (MCL_CURRENT | MCL_FUTURE) < 0)
381 perror ("unable to lock into ram");
382#endif
383
384 if (opt_fork)
385 {
263 if (pid < 0) 386 if (pid < 0)
264 { 387 {
265 rxvt_log ("unable to fork daemon, aborting.\n"); 388 rxvt_log ("unable to fork daemon, aborting.\n");
266 return EXIT_FAILURE; 389 return EXIT_FAILURE;
267 } 390 }
268 else if (pid > 0) 391 else if (pid > 0)
269 _exit (EXIT_SUCCESS); 392 _exit (EXIT_SUCCESS);
270 }
271 393
272 io_manager::loop (); 394 ev_loop_fork (EV_DEFAULT_UC);
395 }
396
397 ev_run ();
273 398
274 return EXIT_SUCCESS; 399 return EXIT_SUCCESS;
275} 400}
276 401

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