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Comparing rxvt-unicode/src/rxvtd.C (file contents):
Revision 1.7 by pcg, Fri Jan 16 22:11:09 2004 UTC vs.
Revision 1.65 by sf-exg, Sat Jun 26 14:42:36 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>
11#include <sys/types.h> 31#include <sys/types.h>
12#include <sys/stat.h> 32#include <sys/stat.h>
13#include <sys/socket.h> 33#include <sys/socket.h>
14#include <sys/un.h> 34#include <sys/un.h>
15 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
16#include <cerrno> 44#include <errno.h>
17 45
18extern char **environ; 46#include "rxvt.h"
47#include "rxvtdaemon.h"
48#include "libptytty.h"
19 49
20struct server : rxvt_connection { 50struct server : rxvt_connection
51{
52 log_callback log_cb;
53 getfd_callback getfd_cb;
54
21 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;
56 void log_msg (const char *msg);
57 int getfd (int remote_fd);
22 58
23 server (int fd) 59 server (int fd)
24 : read_ev (this, &server::read_cb)
25 { 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
26 this->fd = fd; 65 this->fd = fd;
66 fcntl (fd, F_SETFD, FD_CLOEXEC);
67 fcntl (fd, F_SETFL, 0);
27 read_ev.start (fd, EVENT_READ); 68 read_ev.start (fd, ev::READ);
28 } 69 }
29 70
30 void err (const char *format = 0, ...); 71 void err (const char *format = 0, ...);
31}; 72};
32 73
33struct unix_listener { 74struct unix_listener
75{
34 int fd; 76 int fd;
35 77
36 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;
37 79
80 unix_listener (int fd);
38 unix_listener (const char *sockname); 81 static int open (const char *sockname);
39}; 82};
40 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
41unix_listener::unix_listener (const char *sockname) 92int unix_listener::open (const char *sockname)
42: accept_ev (this, &unix_listener::accept_cb)
43{ 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;
44 if ((fd = socket (PF_LOCAL, SOCK_STREAM, 0)) < 0) 103 if ((fd = socket (AF_UNIX, SOCK_STREAM, 0)) < 0)
45 { 104 {
46 perror ("unable to create listening socket"); 105 perror ("unable to create listening socket");
47 exit (EXIT_FAILURE); 106 exit (EXIT_FAILURE);
48 } 107 }
49 108
50 sockaddr_un sa;
51
52 sa.sun_family = AF_UNIX; 109 sa.sun_family = AF_UNIX;
53 strcpy (sa.sun_path, sockname); 110 strcpy (sa.sun_path, sockname);
54 111
55 unlink (rxvt_connection::unix_sockname ()); 112 unlink (sockname);
56 113
57 mode_t omask = umask (0077); 114 mode_t omask = umask (0077);
58 115
59 if (bind (fd, (sockaddr *)&sa, sizeof (sa))) 116 if (bind (fd, (sockaddr *)&sa, sizeof (sa)))
60 { 117 {
… …
68 { 125 {
69 perror ("unable to listen on socket"); 126 perror ("unable to listen on socket");
70 exit (EXIT_FAILURE); 127 exit (EXIT_FAILURE);
71 } 128 }
72 129
73 accept_ev.start (fd, EVENT_READ); 130 return fd;
74} 131}
75 132
76void unix_listener::accept_cb (io_watcher &w, short revents) 133void unix_listener::accept_cb (ev::io &w, int revents)
77{ 134{
78 int fd2 = accept (fd, 0, 0); 135 int fd2 = accept (fd, 0, 0);
79 136
80 if (fd2 >= 0) 137 if (fd2 >= 0)
81 new server (fd2); 138 new server (fd2);
139}
140
141int server::getfd (int remote_fd)
142{
143 send ("GETFD");
144 send (remote_fd);
145 return ptytty::recv_fd (fd);
146}
147
148void server::log_msg (const char *msg)
149{
150 send ("MSG"), send (msg);
82} 151}
83 152
84void server::err (const char *format, ...) 153void server::err (const char *format, ...)
85{ 154{
86 if (format) 155 if (format)
… …
90 va_list ap; 159 va_list ap;
91 va_start (ap, format); 160 va_start (ap, format);
92 vsnprintf (err, 1024, format, ap); 161 vsnprintf (err, 1024, format, ap);
93 va_end (ap); 162 va_end (ap);
94 163
164 log_msg (err);
165 }
166
95 send ("ERR"), send (err); 167 send ("END"), send (0);
96 }
97
98 close (fd); 168 close (fd);
99 delete this; 169 delete this;
100} 170}
101 171
102void server::read_cb (io_watcher &w, short revents) 172void server::read_cb (ev::io &w, int revents)
103{ 173{
104 auto_str tok; 174 auto_str tok;
105 175
106 if (recv (tok)) 176 if (recv (tok))
107 { 177 {
108 if (!strcmp (tok, "NEW")) 178 if (!strcmp (tok, "NEW"))
109 { 179 {
110 stringvec argv; 180 stringvec *argv = new stringvec;
111 stringvec envv; 181 stringvec *envv = new stringvec;
112 182
113 for (;;) 183 for (;;)
114 { 184 {
115 if (!recv (tok)) 185 if (!recv (tok))
116 return err (); 186 return err ();
117 187
118 if (!strcmp (tok, "END")) 188 if (!strcmp (tok, "END"))
119 break; 189 break;
120 else if (!strcmp (tok, "ENV") && recv (tok)) 190 else if (!strcmp (tok, "ENV") && recv (tok))
121 envv.push_back (tok.get ()); 191 envv->push_back (strdup (tok));
122 else if (!strcmp (tok, "CWD") && recv (tok))
123 {
124 if (chdir (tok))
125 err ("unable to change to working directory to '%s': %s",
126 (char *)tok, strerror (errno));
127 }
128 else if (!strcmp (tok, "ARG") && recv (tok)) 192 else if (!strcmp (tok, "ARG") && recv (tok))
129 argv.push_back (tok.get ()); 193 argv->push_back (strdup (tok));
130 else 194 else
131 return err ("protocol error: unexpected NEW token"); 195 return err ("protocol error: unexpected NEW token.\n");
132 } 196 }
133 197
134 envv.push_back (0);
135
136 { 198 {
137 char **old_environ = environ; 199 rxvt_term *term = new rxvt_term;
138 environ = envv.begin ();
139 200
140 rxvt_init (argv.size (), argv.begin ()); 201 term->log_hook = &log_cb;
202 term->getfd_hook = &getfd_cb;
141 203
142 environ = old_environ; 204 bool success = true;
143 envv.clear (); // can't yet save the env 'cause rxvt modifies it :( 205
206 try
207 {
208 term->init (argv, envv);
209 }
210 catch (const class rxvt_failure_exception &e)
211 {
212 success = false;
213 }
214 catch (const std::exception &e)
215 {
216 log_msg (e.what());
217 success = false;
218 }
219
220 term->log_hook = 0;
221
222 chdir ("/"); // init might change to different working directory
223
224 if (!success)
225 term->destroy ();
226
227 send ("END"); send (success ? 1 : 0);
144 } 228 }
145 } 229 }
230 else if (!strcmp (tok, "QUIT"))
231 _exit (0);
146 else 232 else
147 return err ("protocol error: request '%s' unsupported.", (char *)tok); 233 return err ("protocol error: request '%s' unsupported.\n", (char *)tok);
148 } 234 }
149 else 235 else
150 return err (); 236 return err ();
151} 237}
152 238
239#ifdef ENABLE_FRILLS
240enum {
241 SD_LISTEN_FDS_START = 3,
242};
243
244// https://www.freedesktop.org/software/systemd/man/sd_listen_fds.html
245// https://github.com/systemd/systemd/blob/main/src/libsystemd/sd-daemon/sd-daemon.c
246static int get_listen_fds ()
247{
248 const char *listen_pid = getenv ("LISTEN_PID");
249 if (!listen_pid)
250 return 0;
251
252 char *end;
253 errno = 0;
254 long pid = strtol (listen_pid, &end, 10);
255 if (errno || end == listen_pid || *end)
256 return -1;
257
258 if (getpid () != pid)
259 return 0;
260
261 const char *listen_fds = getenv ("LISTEN_FDS");
262 if (!listen_fds)
263 return 0;
264
265 errno = 0;
266 long n = strtol (listen_fds, &end, 10);
267 if (errno || end == listen_fds || *end)
268 return -1;
269
270 if (n <= 0 || n > INT_MAX - SD_LISTEN_FDS_START)
271 return -1;
272
273 unsetenv ("LISTEN_PID");
274 unsetenv ("LISTEN_FDS");
275 unsetenv ("LISTEN_FDNAMES");
276
277 return n;
278}
279#endif
280
153int 281int
154main(int argc, const char *const *argv) 282main (int argc, char *argv[])
155{ 283{
156 rxvt_init_signals (); 284 try
157 285 {
158 char *sockname = rxvt_connection::unix_sockname (); 286 ptytty::init ();
159 unix_listener l (sockname); 287 }
160 printf ("rxvtd listening on %s.\n", sockname); 288 catch (const std::exception &e)
161 free (sockname); 289 {
162 290 fputs (e.what (), stderr);
163 iom.loop ();
164
165#if 0
166 if (rxvt_init(argc, argv) == NULL)
167 return EXIT_FAILURE; 291 return EXIT_FAILURE;
292 }
168 293
169 dR; 294 static char opt_fork, opt_opendisplay, opt_quiet;
170 rxvt_main_loop(aR); /* main processing loop */ 295#if ENABLE_PERL
296 static char *opt_eval;
171#endif 297#endif
298#if ENABLE_MLOCK
299 static char opt_lock;
300#endif
301
302 for (int i = 1; i < argc; i++)
303 {
304 if (!strcmp (argv [i], "-f") || !strcmp (argv [i], "--fork"))
305 opt_fork = 1;
306 else if (!strcmp (argv [i], "-o") || !strcmp (argv [i], "--opendisplay"))
307 opt_opendisplay = 1;
308 else if (!strcmp (argv [i], "-q") || !strcmp (argv [i], "--quiet"))
309 opt_quiet = 1;
310#if ENABLE_MLOCK
311 else if (!strcmp (argv [i], "-m") || !strcmp (argv [i], "--mlock"))
312 opt_lock = 1;
313#endif
314#if ENABLE_PERL
315 else if (!strcmp (argv [i], "-e") || !strcmp (argv [i], "--eval"))
316 opt_eval = argv [++i];
317#endif
318 else
319 {
320 rxvt_log ("%s: unknown option '%s', aborting.\n", argv [0], argv [i]);
321 return EXIT_FAILURE;
322 }
323 }
324
325 rxvt_init ();
326
327#if ENABLE_PERL
328 if (opt_eval)
329 {
330 rxvt_perl.init ();
331 rxvt_perl.eval (opt_eval);
332 }
333#endif
334
335 // optionally open display and never release it.
336 if (opt_opendisplay)
337 if (const char *dpy = getenv ("DISPLAY"))
338 displays.get (dpy ? dpy : ":0"); // move string logic into rxvt_display maybe?
339
340 int fd;
341#ifdef ENABLE_FRILLS
342 int n = get_listen_fds ();
343 if (n > 1)
344 {
345 fputs ("received multiple file descriptors, aborting.\n", stderr);
346 exit (EXIT_FAILURE);
347 }
348 else if (n == 1)
349 {
350 fd = SD_LISTEN_FDS_START;
351 if (!opt_quiet)
352 {
353 printf ("rxvt-unicode daemon listening on fd.\n");
354 fflush (stdout);
355 }
356 }
357 else
358#endif
359 {
360 char *sockname = rxvt_connection::unix_sockname ();
361 fd = unix_listener::open (sockname);
362 if (!opt_quiet)
363 {
364 printf ("rxvt-unicode daemon listening on %s.\n", sockname);
365 fflush (stdout);
366 }
367 free (sockname);
368 }
369
370 unix_listener l (fd);
371
372 chdir ("/");
373
374 pid_t pid = 0;
375 if (opt_fork)
376 {
377 pid = fork ();
378 }
379
380#if ENABLE_MLOCK
381 // Optionally perform an mlockall so this process does not get swapped out.
382 if (opt_lock && !pid)
383 if (mlockall (MCL_CURRENT | MCL_FUTURE) < 0)
384 perror ("unable to lock into ram");
385#endif
386
387 if (opt_fork)
388 {
389 if (pid < 0)
390 {
391 rxvt_log ("unable to fork daemon, aborting.\n");
392 return EXIT_FAILURE;
393 }
394 else if (pid > 0)
395 _exit (EXIT_SUCCESS);
396
397 ev_loop_fork (EV_DEFAULT_UC);
398 }
399
400 ev_run ();
401
172 return EXIT_SUCCESS; 402 return EXIT_SUCCESS;
173} 403}
174 404

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