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Comparing rxvt-unicode/src/rxvtd.C (file contents):
Revision 1.4 by pcg, Tue Nov 25 17:34:47 2003 UTC vs.
Revision 1.67 by sf-exg, Fri Jul 23 19:18:52 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>
7#include <cstdarg> 26#include <stdarg.h>
8#include <cstring> 27#include <string.h>
9 28
10#include <unistd.h> 29#include <unistd.h>
30#include <fcntl.h>
31#include <sys/types.h>
32#include <sys/stat.h>
11#include <sys/socket.h> 33#include <sys/socket.h>
12#include <sys/un.h> 34#include <sys/un.h>
13 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
14#include <cerrno> 44#include <errno.h>
15 45
16extern char **environ; 46#include <libptytty.h>
17 47
48#include "rxvt.h"
49#include "rxvtdaemon.h"
50
18struct server : rxvt_connection { 51struct server : rxvt_connection
52{
53 log_callback log_cb;
54 getfd_callback getfd_cb;
55
19 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;
57 void log_msg (const char *msg);
58 int getfd (int remote_fd);
20 59
21 server (int fd) 60 server (int fd)
22 : read_ev (this, &server::read_cb)
23 { 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
24 this->fd = fd; 66 this->fd = fd;
67 fcntl (fd, F_SETFD, FD_CLOEXEC);
68 fcntl (fd, F_SETFL, 0);
25 read_ev.start (fd, EVENT_READ); 69 read_ev.start (fd, ev::READ);
26 } 70 }
27 71
28 void err (const char *format = 0, ...); 72 void err (const char *format = 0, ...);
29}; 73};
30 74
31struct listener { 75struct unix_listener
76{
32 int fd; 77 int fd;
33 78
34 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;
35 80
36 listener (); 81 unix_listener (int fd);
82 static int open (const char *sockname);
37}; 83};
38 84
39listener::listener () 85unix_listener::unix_listener (int fd) : fd (fd)
40: accept_ev (this, &listener::accept_cb)
41{ 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
93int unix_listener::open (const char *sockname)
94{
95 sockaddr_un sa;
96
97 if (strlen (sockname) >= sizeof(sa.sun_path))
98 {
99 fputs ("socket name too long, aborting.\n", stderr);
100 exit (EXIT_FAILURE);
101 }
102
103 int fd;
42 if ((fd = socket (PF_LOCAL, SOCK_STREAM, 0)) < 0) 104 if ((fd = socket (AF_UNIX, SOCK_STREAM, 0)) < 0)
43 { 105 {
44 perror ("unable to create listening socket"); 106 perror ("unable to create listening socket");
45 exit (EXIT_FAILURE); 107 exit (EXIT_FAILURE);
46 } 108 }
47 109
48 sockaddr_un sa;
49
50 sa.sun_family = AF_UNIX; 110 sa.sun_family = AF_UNIX;
51 strcpy (sa.sun_path, rxvt_connection::unix_sockname ()); 111 strcpy (sa.sun_path, sockname);
52 112
53 unlink (rxvt_connection::unix_sockname ()); 113 unlink (sockname);
114
115 mode_t omask = umask (0077);
54 116
55 if (bind (fd, (sockaddr *)&sa, sizeof (sa))) 117 if (bind (fd, (sockaddr *)&sa, sizeof (sa)))
56 { 118 {
57 perror ("unable to bind listening socket"); 119 perror ("unable to bind listening socket");
58 exit (EXIT_FAILURE); 120 exit (EXIT_FAILURE);
59 } 121 }
60 122
123 umask (omask);
124
61 if (listen (fd, 5)) 125 if (listen (fd, 5))
62 { 126 {
63 perror ("unable to listen on socket"); 127 perror ("unable to listen on socket");
64 exit (EXIT_FAILURE); 128 exit (EXIT_FAILURE);
65 } 129 }
66 130
67 accept_ev.start (fd, EVENT_READ); 131 return fd;
68} 132}
69 133
70void listener::accept_cb (io_watcher &w, short revents) 134void unix_listener::accept_cb (ev::io &w, int revents)
71{ 135{
72 int fd2 = accept (fd, 0, 0); 136 int fd2 = accept (fd, 0, 0);
73 137
74 if (fd2 >= 0) 138 if (fd2 >= 0)
75 new server (fd2); 139 new server (fd2);
140}
141
142int server::getfd (int remote_fd)
143{
144 send ("GETFD");
145 send (remote_fd);
146 return ptytty::recv_fd (fd);
147}
148
149void server::log_msg (const char *msg)
150{
151 send ("MSG"), send (msg);
76} 152}
77 153
78void server::err (const char *format, ...) 154void server::err (const char *format, ...)
79{ 155{
80 if (format) 156 if (format)
… …
84 va_list ap; 160 va_list ap;
85 va_start (ap, format); 161 va_start (ap, format);
86 vsnprintf (err, 1024, format, ap); 162 vsnprintf (err, 1024, format, ap);
87 va_end (ap); 163 va_end (ap);
88 164
165 log_msg (err);
166 }
167
89 send ("ERR"), send (err); 168 send ("END"), send (0);
90 }
91
92 close (fd); 169 close (fd);
93 delete this; 170 delete this;
94} 171}
95 172
96void server::read_cb (io_watcher &w, short revents) 173void server::read_cb (ev::io &w, int revents)
97{ 174{
98 auto_str tok; 175 auto_str tok;
99 176
100 if (recv (tok)) 177 if (recv (tok))
101 { 178 {
102 if (!strcmp (tok, "NEW")) 179 if (!strcmp (tok, "NEW"))
103 { 180 {
104 stringvec argv; 181 stringvec *argv = new stringvec;
105 stringvec envv; 182 stringvec *envv = new stringvec;
106 183
107 for (;;) 184 for (;;)
108 { 185 {
109 if (!recv (tok)) 186 if (!recv (tok))
110 return err (); 187 return err ();
111 188
112 if (!strcmp (tok, "END")) 189 if (!strcmp (tok, "END"))
113 break; 190 break;
114 else if (!strcmp (tok, "ENV") && recv (tok)) 191 else if (!strcmp (tok, "ENV") && recv (tok))
115 envv.push_back (tok.get ()); 192 envv->push_back (strdup (tok));
116 else if (!strcmp (tok, "CWD") && recv (tok))
117 {
118 if (chdir (tok))
119 err ("unable to change to working directory to '%s': %s",
120 (char *)tok, strerror (errno));
121 }
122 else if (!strcmp (tok, "ARG") && recv (tok)) 193 else if (!strcmp (tok, "ARG") && recv (tok))
123 argv.push_back (tok.get ()); 194 argv->push_back (strdup (tok));
124 else 195 else
125 return err ("protocol error: unexpected NEW token"); 196 return err ("protocol error: unexpected NEW token.\n");
126 } 197 }
127 198
128 envv.push_back (0);
129
130 { 199 {
131 char **old_environ = environ; 200 rxvt_term *term = new rxvt_term;
132 environ = envv.begin ();
133 201
134 rxvt_init (argv.size (), argv.begin ()); 202 term->log_hook = &log_cb;
203 term->getfd_hook = &getfd_cb;
135 204
136 environ = old_environ; 205 bool success = true;
137 envv.clear (); // can't yet save the env 'cause rxvt modifies it :( 206
207 try
208 {
209 term->init (argv, envv);
210 }
211 catch (const std::exception &e)
212 {
213 log_msg (e.what());
214 success = false;
215 }
216
217 term->log_hook = 0;
218
219 chdir ("/"); // init might change to different working directory
220
221 if (!success)
222 term->destroy ();
223
224 send ("END"); send (success ? 1 : 0);
138 } 225 }
139 } 226 }
227 else if (!strcmp (tok, "QUIT"))
228 _exit (0);
140 else 229 else
141 return err ("protocol error: request '%s' unsupported.", (char *)tok); 230 return err ("protocol error: request '%s' unsupported.\n", (char *)tok);
142 } 231 }
143 else 232 else
144 return err (); 233 return err ();
145} 234}
146 235
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
277
147int 278int
148main(int argc, const char *const *argv) 279main (int argc, char *argv[])
149{ 280{
150 listener l; 281 try
151
152 { 282 {
153 sigset_t ss; 283 ptytty::init ();
154
155 sigaddset (&ss, SIGHUP);
156 sigprocmask (SIG_BLOCK, &ss, 0);
157 } 284 }
158 285 catch (const std::exception &e)
159 printf ("rxvtd running.\n"); 286 {
160 iom.loop (); 287 fputs (e.what (), stderr);
161
162#if 0
163 if (rxvt_init(argc, argv) == NULL)
164 return EXIT_FAILURE; 288 return EXIT_FAILURE;
289 }
165 290
166 dR; 291 static char opt_fork, opt_opendisplay, opt_quiet;
167 rxvt_main_loop(aR); /* main processing loop */ 292#if ENABLE_PERL
293 static char *opt_eval;
168#endif 294#endif
295#if ENABLE_MLOCK
296 static char opt_lock;
297#endif
298
299 for (int i = 1; i < argc; i++)
300 {
301 if (!strcmp (argv [i], "-f") || !strcmp (argv [i], "--fork"))
302 opt_fork = 1;
303 else if (!strcmp (argv [i], "-o") || !strcmp (argv [i], "--opendisplay"))
304 opt_opendisplay = 1;
305 else if (!strcmp (argv [i], "-q") || !strcmp (argv [i], "--quiet"))
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
315 else
316 {
317 rxvt_log ("%s: unknown option '%s', aborting.\n", argv [0], argv [i]);
318 return EXIT_FAILURE;
319 }
320 }
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
369 chdir ("/");
370
371 pid_t pid = 0;
372 if (opt_fork)
373 {
374 pid = fork ();
375 }
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 {
386 if (pid < 0)
387 {
388 rxvt_log ("unable to fork daemon, aborting.\n");
389 return EXIT_FAILURE;
390 }
391 else if (pid > 0)
392 _exit (EXIT_SUCCESS);
393
394 ev_loop_fork (EV_DEFAULT_UC);
395 }
396
397 ev_run ();
398
169 return EXIT_SUCCESS; 399 return EXIT_SUCCESS;
170} 400}
401

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