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Comparing rxvt-unicode/src/rxvtd.C (file contents):
Revision 1.24 by root, Tue Jan 17 15:17:39 2006 UTC vs.
Revision 1.64 by root, Thu Jun 17 00:08:35 2021 UTC

1/*--------------------------------*-C-*---------------------------------* 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) 2003-2004 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 "rxvt.h"
25#include "rxvtdaemon.h"
26#include "fdpass.h"
27#include "iom.h"
28
29#include <cstdio> 24#include <stdio.h>
30#include <cstdlib> 25#include <stdlib.h>
31#include <cstdarg> 26#include <stdarg.h>
32#include <cstring> 27#include <string.h>
33 28
34#include <unistd.h> 29#include <unistd.h>
35#include <fcntl.h> 30#include <fcntl.h>
36#include <sys/types.h> 31#include <sys/types.h>
37#include <sys/stat.h> 32#include <sys/stat.h>
38#include <sys/socket.h> 33#include <sys/socket.h>
39#include <sys/un.h> 34#include <sys/un.h>
40 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
41#include <cerrno> 44#include <errno.h>
42 45
43extern char **environ; 46#include "rxvt.h"
47#include "rxvtdaemon.h"
48#include "libptytty.h"
44 49
45struct server : rxvt_connection { 50struct server : rxvt_connection
51{
46 log_callback log_cb; 52 log_callback log_cb;
47 getfd_callback getfd_cb; 53 getfd_callback getfd_cb;
48 54
49 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;
50 void log_msg (const char *msg); 56 void log_msg (const char *msg);
51 int getfd (int remote_fd); 57 int getfd (int remote_fd);
52 58
53 server (int fd) 59 server (int fd)
54 : read_ev (this, &server::read_cb),
55 log_cb (this, &server::log_msg),
56 getfd_cb (this, &server::getfd)
57 { 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
58 this->fd = fd; 65 this->fd = fd;
66 fcntl (fd, F_SETFD, FD_CLOEXEC);
67 fcntl (fd, F_SETFL, 0);
59 read_ev.start (fd, EVENT_READ); 68 read_ev.start (fd, ev::READ);
60 } 69 }
61 70
62 void err (const char *format = 0, ...); 71 void err (const char *format = 0, ...);
63}; 72};
64 73
65struct unix_listener { 74struct unix_listener
75{
66 int fd; 76 int fd;
67 77
68 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;
69 79
80 unix_listener (int fd);
70 unix_listener (const char *sockname); 81 static int open (const char *sockname);
71}; 82};
72 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
73unix_listener::unix_listener (const char *sockname) 92int unix_listener::open (const char *sockname)
74: accept_ev (this, &unix_listener::accept_cb)
75{ 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;
76 if ((fd = socket (AF_UNIX, SOCK_STREAM, 0)) < 0) 103 if ((fd = socket (AF_UNIX, SOCK_STREAM, 0)) < 0)
77 { 104 {
78 perror ("unable to create listening socket"); 105 perror ("unable to create listening socket");
79 exit (EXIT_FAILURE); 106 exit (EXIT_FAILURE);
80 } 107 }
81
82 fcntl (fd, F_SETFD, FD_CLOEXEC);
83
84 sockaddr_un sa;
85 108
86 sa.sun_family = AF_UNIX; 109 sa.sun_family = AF_UNIX;
87 strcpy (sa.sun_path, sockname); 110 strcpy (sa.sun_path, sockname);
88 111
89 unlink (rxvt_connection::unix_sockname ()); 112 unlink (sockname);
90 113
91 mode_t omask = umask (0077); 114 mode_t omask = umask (0077);
92 115
93 if (bind (fd, (sockaddr *)&sa, sizeof (sa))) 116 if (bind (fd, (sockaddr *)&sa, sizeof (sa)))
94 { 117 {
… …
102 { 125 {
103 perror ("unable to listen on socket"); 126 perror ("unable to listen on socket");
104 exit (EXIT_FAILURE); 127 exit (EXIT_FAILURE);
105 } 128 }
106 129
107 accept_ev.start (fd, EVENT_READ); 130 return fd;
108} 131}
109 132
110void unix_listener::accept_cb (io_watcher &w, short revents) 133void unix_listener::accept_cb (ev::io &w, int revents)
111{ 134{
112 int fd2 = accept (fd, 0, 0); 135 int fd2 = accept (fd, 0, 0);
113 136
114 if (fd2 >= 0) 137 if (fd2 >= 0)
115 {
116 fcntl (fd2, F_SETFD, FD_CLOEXEC);
117 new server (fd2); 138 new server (fd2);
118 }
119} 139}
120 140
121int server::getfd (int remote_fd) 141int server::getfd (int remote_fd)
122{ 142{
123 send ("GETFD"); 143 send ("GETFD");
124 send (remote_fd); 144 send (remote_fd);
125 return rxvt_recv_fd (fd); 145 return ptytty::recv_fd (fd);
126} 146}
127 147
128void server::log_msg (const char *msg) 148void server::log_msg (const char *msg)
129{ 149{
130 send ("MSG"), send (msg); 150 send ("MSG"), send (msg);
… …
139 va_list ap; 159 va_list ap;
140 va_start (ap, format); 160 va_start (ap, format);
141 vsnprintf (err, 1024, format, ap); 161 vsnprintf (err, 1024, format, ap);
142 va_end (ap); 162 va_end (ap);
143 163
144 send ("MSG"), send (err); 164 log_msg (err);
145 } 165 }
146 166
147 send ("END", 0); 167 send ("END"), send (0);
148 close (fd); 168 close (fd);
149 delete this; 169 delete this;
150} 170}
151 171
152void server::read_cb (io_watcher &w, short revents) 172void server::read_cb (ev::io &w, int revents)
153{ 173{
154 auto_str tok; 174 auto_str tok;
155 175
156 if (recv (tok)) 176 if (recv (tok))
157 { 177 {
158 if (!strcmp (tok, "NEW")) 178 if (!strcmp (tok, "NEW"))
159 { 179 {
160 stringvec *argv = new stringvec; 180 stringvec *argv = new stringvec;
161 stringvec *envv = new stringvec; 181 stringvec *envv = new stringvec;
162 182
163 for (;;) 183 for (;;)
164 { 184 {
165 if (!recv (tok)) 185 if (!recv (tok))
166 return err (); 186 return err ();
167 187
168 if (!strcmp (tok, "END")) 188 if (!strcmp (tok, "END"))
169 break; 189 break;
170 else if (!strcmp (tok, "ENV") && recv (tok)) 190 else if (!strcmp (tok, "ENV") && recv (tok))
171 envv->push_back (tok.get ()); 191 envv->push_back (strdup (tok));
172 else if (!strcmp (tok, "CWD") && recv (tok))
173 {
174 if (chdir (tok))
175 err ("unable to change to working directory to '%s': %s",
176 (char *)tok, strerror (errno));
177 }
178 else if (!strcmp (tok, "ARG") && recv (tok)) 192 else if (!strcmp (tok, "ARG") && recv (tok))
179 argv->push_back (tok.get ()); 193 argv->push_back (strdup (tok));
180 else 194 else
181 return err ("protocol error: unexpected NEW token"); 195 return err ("protocol error: unexpected NEW token.\n");
182 } 196 }
183
184 envv->push_back (0);
185 197
186 { 198 {
187 rxvt_term *term = new rxvt_term; 199 rxvt_term *term = new rxvt_term;
188 200
189 term->log_hook = &log_cb; 201 term->log_hook = &log_cb;
190 term->getfd_hook = &getfd_cb; 202 term->getfd_hook = &getfd_cb;
191 term->argv = argv;
192 term->envv = envv;
193 203
194 bool success; 204 bool success = true;
195 205
196 try 206 try
197 { 207 {
198 success = term->init (argv->size (), argv->begin ()); 208 term->init (argv, envv);
199 } 209 }
200 catch (const class rxvt_failure_exception &e) 210 catch (const class rxvt_failure_exception &e)
201 { 211 {
202 success = false; 212 success = false;
203 } 213 }
204 214
205 term->log_hook = 0; 215 term->log_hook = 0;
206 216
207 chdir ("/"); 217 chdir ("/"); // init might change to different working directory
208 218
209 if (!success) 219 if (!success)
210 term->destroy (); 220 term->destroy ();
211 221
212 send ("END"); send (success ? 1 : 0); 222 send ("END"); send (success ? 1 : 0);
213 } 223 }
214 } 224 }
225 else if (!strcmp (tok, "QUIT"))
226 _exit (0);
215 else 227 else
216 return err ("protocol error: request '%s' unsupported.", (char *)tok); 228 return err ("protocol error: request '%s' unsupported.\n", (char *)tok);
217 } 229 }
218 else 230 else
219 return err (); 231 return err ();
220} 232}
221 233
222int opt_fork, opt_opendisplay, opt_quiet; 234#ifdef ENABLE_FRILLS
235enum {
236 SD_LISTEN_FDS_START = 3,
237};
238
239// https://www.freedesktop.org/software/systemd/man/sd_listen_fds.html
240// https://github.com/systemd/systemd/blob/main/src/libsystemd/sd-daemon/sd-daemon.c
241static int get_listen_fds ()
242{
243 const char *listen_pid = getenv ("LISTEN_PID");
244 if (!listen_pid)
245 return 0;
246
247 char *end;
248 errno = 0;
249 long pid = strtol (listen_pid, &end, 10);
250 if (errno || end == listen_pid || *end)
251 return -1;
252
253 if (getpid () != pid)
254 return 0;
255
256 const char *listen_fds = getenv ("LISTEN_FDS");
257 if (!listen_fds)
258 return 0;
259
260 errno = 0;
261 long n = strtol (listen_fds, &end, 10);
262 if (errno || end == listen_fds || *end)
263 return -1;
264
265 if (n <= 0 || n > INT_MAX - SD_LISTEN_FDS_START)
266 return -1;
267
268 unsetenv ("LISTEN_PID");
269 unsetenv ("LISTEN_FDS");
270 unsetenv ("LISTEN_FDNAMES");
271
272 return n;
273}
274#endif
223 275
224int 276int
225main (int argc, const char *const *argv) 277main (int argc, char *argv[])
226{ 278{
279 ptytty::init ();
280
281 static char opt_fork, opt_opendisplay, opt_quiet;
282#if ENABLE_PERL
283 static char *opt_eval;
284#endif
285#if ENABLE_MLOCK
286 static char opt_lock;
287#endif
288
227 for (int i = 1; i < argc; i++) 289 for (int i = 1; i < argc; i++)
228 { 290 {
229 if (!strcmp (argv [i], "-f") || !strcmp (argv [i], "--fork")) 291 if (!strcmp (argv [i], "-f") || !strcmp (argv [i], "--fork"))
230 opt_fork = 1; 292 opt_fork = 1;
231 else if (!strcmp (argv [i], "-o") || !strcmp (argv [i], "--opendisplay")) 293 else if (!strcmp (argv [i], "-o") || !strcmp (argv [i], "--opendisplay"))
232 opt_opendisplay = 1; 294 opt_opendisplay = 1;
233 else if (!strcmp (argv [i], "-q") || !strcmp (argv [i], "--quiet")) 295 else if (!strcmp (argv [i], "-q") || !strcmp (argv [i], "--quiet"))
234 opt_quiet = 1; 296 opt_quiet = 1;
297#if ENABLE_MLOCK
298 else if (!strcmp (argv [i], "-m") || !strcmp (argv [i], "--mlock"))
299 opt_lock = 1;
300#endif
301#if ENABLE_PERL
302 else if (!strcmp (argv [i], "-e") || !strcmp (argv [i], "--eval"))
303 opt_eval = argv [++i];
304#endif
235 else 305 else
236 { 306 {
237 rxvt_log ("%s: unknown option '%s', aborting.\n", argv [0], argv [i]); 307 rxvt_log ("%s: unknown option '%s', aborting.\n", argv [0], argv [i]);
238 return EXIT_FAILURE; 308 return EXIT_FAILURE;
239 } 309 }
240 } 310 }
241 311
242 rxvt_init (); 312 rxvt_init ();
243 313
314#if ENABLE_PERL
315 if (opt_eval)
316 {
317 rxvt_perl.init ();
318 rxvt_perl.eval (opt_eval);
319 }
320#endif
321
322 // optionally open display and never release it.
323 if (opt_opendisplay)
324 if (const char *dpy = getenv ("DISPLAY"))
325 displays.get (dpy ? dpy : ":0"); // move string logic into rxvt_display maybe?
326
327 int fd;
328#ifdef ENABLE_FRILLS
329 int n = get_listen_fds ();
330 if (n > 1)
331 {
332 fputs ("received multiple file descriptors, aborting.\n", stderr);
333 exit (EXIT_FAILURE);
334 }
335 else if (n == 1)
336 {
337 fd = SD_LISTEN_FDS_START;
338 if (!opt_quiet)
339 {
340 printf ("rxvt-unicode daemon listening on fd.\n");
341 fflush (stdout);
342 }
343 }
344 else
345#endif
346 {
347 char *sockname = rxvt_connection::unix_sockname ();
348 fd = unix_listener::open (sockname);
349 if (!opt_quiet)
350 {
351 printf ("rxvt-unicode daemon listening on %s.\n", sockname);
352 fflush (stdout);
353 }
354 free (sockname);
355 }
356
357 unix_listener l (fd);
358
244 chdir ("/"); 359 chdir ("/");
245 360
246 if (opt_opendisplay) 361 pid_t pid = 0;
247 displays.get (getenv ("DISPLAY")); // open display and never release it
248
249 char *sockname = rxvt_connection::unix_sockname ();
250 unix_listener l (sockname);
251
252 if (!opt_quiet)
253 {
254 printf ("rxvt-unicode daemon listening on %s.\n", sockname);
255 fflush (stdout);
256 }
257
258 free (sockname);
259
260 if (opt_fork) 362 if (opt_fork)
261 { 363 {
262 pid_t pid = fork (); 364 pid = fork ();
365 }
263 366
367#if ENABLE_MLOCK
368 // Optionally perform an mlockall so this process does not get swapped out.
369 if (opt_lock && !pid)
370 if (mlockall (MCL_CURRENT | MCL_FUTURE) < 0)
371 perror ("unable to lock into ram");
372#endif
373
374 if (opt_fork)
375 {
264 if (pid < 0) 376 if (pid < 0)
265 { 377 {
266 rxvt_log ("unable to fork daemon, aborting.\n"); 378 rxvt_log ("unable to fork daemon, aborting.\n");
267 return EXIT_FAILURE; 379 return EXIT_FAILURE;
268 } 380 }
269 else if (pid > 0) 381 else if (pid > 0)
270 _exit (EXIT_SUCCESS); 382 _exit (EXIT_SUCCESS);
271 }
272 383
273 io_manager::loop (); 384 ev_loop_fork (EV_DEFAULT_UC);
385 }
386
387 ev_run ();
274 388
275 return EXIT_SUCCESS; 389 return EXIT_SUCCESS;
276} 390}
277 391

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