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Comparing rxvt-unicode/src/rxvtd.C (file contents):
Revision 1.9 by pcg, Fri Feb 13 13:28:17 2004 UTC vs.
Revision 1.63 by sf-exg, Sun May 9 05:53:12 2021 UTC

1/*----------------------------------------------------------------------*
2 * File: rxvtd.C
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 *----------------------------------------------------------------------*/
22
1#include "../config.h" 23#include "../config.h"
2#include "rxvt.h"
3#include "rxvtdaemon.h"
4#include "iom.h"
5
6#include <cstdio> 24#include <stdio.h>
7#include <cstdlib> 25#include <stdlib.h>
8#include <cstdarg> 26#include <stdarg.h>
9#include <cstring> 27#include <string.h>
10 28
11#include <unistd.h> 29#include <unistd.h>
30#include <fcntl.h>
12#include <sys/types.h> 31#include <sys/types.h>
13#include <sys/stat.h> 32#include <sys/stat.h>
14#include <sys/socket.h> 33#include <sys/socket.h>
15#include <sys/un.h> 34#include <sys/un.h>
16 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
17#include <cerrno> 44#include <errno.h>
18 45
19extern char **environ; 46#include "rxvt.h"
47#include "rxvtdaemon.h"
48#include "libptytty.h"
20 49
21struct server : rxvt_connection { 50struct server : rxvt_connection {
51 log_callback log_cb;
52 getfd_callback getfd_cb;
53
22 void read_cb (io_watcher &w, short revents); io_watcher read_ev; 54 void read_cb (ev::io &w, int revents); ev::io read_ev;
55 void log_msg (const char *msg);
56 int getfd (int remote_fd);
23 57
24 server (int fd) 58 server (int fd)
25 : read_ev (this, &server::read_cb)
26 { 59 {
60 read_ev.set <server, &server::read_cb> (this);
61 log_cb.set <server, &server::log_msg> (this);
62 getfd_cb.set<server, &server::getfd> (this);
63
27 this->fd = fd; 64 this->fd = fd;
65 fcntl (fd, F_SETFD, FD_CLOEXEC);
66 fcntl (fd, F_SETFL, 0);
28 read_ev.start (fd, EVENT_READ); 67 read_ev.start (fd, ev::READ);
29 } 68 }
30 69
31 void err (const char *format = 0, ...); 70 void err (const char *format = 0, ...);
32}; 71};
33 72
34struct unix_listener { 73struct unix_listener {
35 int fd; 74 int fd;
36 75
37 void accept_cb (io_watcher &w, short revents); io_watcher accept_ev; 76 void accept_cb (ev::io &w, int revents); ev::io accept_ev;
38 77
78 unix_listener (int fd);
39 unix_listener (const char *sockname); 79 static int open (const char *sockname);
40}; 80};
41 81
82unix_listener::unix_listener (int fd) : fd (fd)
83{
84 accept_ev.set<unix_listener, &unix_listener::accept_cb> (this);
85 fcntl (fd, F_SETFD, FD_CLOEXEC);
86 fcntl (fd, F_SETFL, O_NONBLOCK);
87 accept_ev.start (fd, ev::READ);
88}
89
42unix_listener::unix_listener (const char *sockname) 90int unix_listener::open (const char *sockname)
43: accept_ev (this, &unix_listener::accept_cb)
44{ 91{
92 sockaddr_un sa;
93
94 if (strlen (sockname) >= sizeof(sa.sun_path))
95 {
96 fputs ("socket name too long, aborting.\n", stderr);
97 exit (EXIT_FAILURE);
98 }
99
100 int fd;
45 if ((fd = socket (PF_LOCAL, SOCK_STREAM, 0)) < 0) 101 if ((fd = socket (AF_UNIX, SOCK_STREAM, 0)) < 0)
46 { 102 {
47 perror ("unable to create listening socket"); 103 perror ("unable to create listening socket");
48 exit (EXIT_FAILURE); 104 exit (EXIT_FAILURE);
49 } 105 }
50
51 sockaddr_un sa;
52 106
53 sa.sun_family = AF_UNIX; 107 sa.sun_family = AF_UNIX;
54 strcpy (sa.sun_path, sockname); 108 strcpy (sa.sun_path, sockname);
55 109
56 unlink (rxvt_connection::unix_sockname ()); 110 unlink (sockname);
57 111
58 mode_t omask = umask (0077); 112 mode_t omask = umask (0077);
59 113
60 if (bind (fd, (sockaddr *)&sa, sizeof (sa))) 114 if (bind (fd, (sockaddr *)&sa, sizeof (sa)))
61 { 115 {
… …
69 { 123 {
70 perror ("unable to listen on socket"); 124 perror ("unable to listen on socket");
71 exit (EXIT_FAILURE); 125 exit (EXIT_FAILURE);
72 } 126 }
73 127
74 accept_ev.start (fd, EVENT_READ); 128 return fd;
75} 129}
76 130
77void unix_listener::accept_cb (io_watcher &w, short revents) 131void unix_listener::accept_cb (ev::io &w, int revents)
78{ 132{
79 int fd2 = accept (fd, 0, 0); 133 int fd2 = accept (fd, 0, 0);
80 134
81 if (fd2 >= 0) 135 if (fd2 >= 0)
82 new server (fd2); 136 new server (fd2);
137}
138
139int server::getfd (int remote_fd)
140{
141 send ("GETFD");
142 send (remote_fd);
143 return ptytty::recv_fd (fd);
144}
145
146void server::log_msg (const char *msg)
147{
148 send ("MSG"), send (msg);
83} 149}
84 150
85void server::err (const char *format, ...) 151void server::err (const char *format, ...)
86{ 152{
87 if (format) 153 if (format)
… …
91 va_list ap; 157 va_list ap;
92 va_start (ap, format); 158 va_start (ap, format);
93 vsnprintf (err, 1024, format, ap); 159 vsnprintf (err, 1024, format, ap);
94 va_end (ap); 160 va_end (ap);
95 161
162 log_msg (err);
163 }
164
96 send ("ERR"), send (err); 165 send ("END"), send (0);
97 }
98
99 close (fd); 166 close (fd);
100 delete this; 167 delete this;
101} 168}
102 169
103void server::read_cb (io_watcher &w, short revents) 170void server::read_cb (ev::io &w, int revents)
104{ 171{
105 auto_str tok; 172 auto_str tok;
106 173
107 if (recv (tok)) 174 if (recv (tok))
108 { 175 {
109 if (!strcmp (tok, "NEW")) 176 if (!strcmp (tok, "NEW"))
110 { 177 {
111 stringvec *argv = new stringvec; 178 stringvec *argv = new stringvec;
112 stringvec *envv = new stringvec; 179 stringvec *envv = new stringvec;
113 180
114 for (;;) 181 for (;;)
115 { 182 {
116 if (!recv (tok)) 183 if (!recv (tok))
117 return err (); 184 return err ();
118 185
119 if (!strcmp (tok, "END")) 186 if (!strcmp (tok, "END"))
120 break; 187 break;
121 else if (!strcmp (tok, "ENV") && recv (tok)) 188 else if (!strcmp (tok, "ENV") && recv (tok))
122 envv->push_back (tok.get ()); 189 envv->push_back (strdup (tok));
123 else if (!strcmp (tok, "CWD") && recv (tok))
124 {
125 if (chdir (tok))
126 err ("unable to change to working directory to '%s': %s",
127 (char *)tok, strerror (errno));
128 }
129 else if (!strcmp (tok, "ARG") && recv (tok)) 190 else if (!strcmp (tok, "ARG") && recv (tok))
130 argv->push_back (tok.get ()); 191 argv->push_back (strdup (tok));
131 else 192 else
132 return err ("protocol error: unexpected NEW token"); 193 return err ("protocol error: unexpected NEW token.\n");
133 } 194 }
134 195
135 envv->push_back (0);
136
137 { 196 {
138 char **old_environ = environ; 197 rxvt_term *term = new rxvt_term;
139 environ = envv->begin ();
140 198
141 rxvt_term *term = rxvt_init (argv->size (), argv->begin ()); 199 term->log_hook = &log_cb;
200 term->getfd_hook = &getfd_cb;
142 201
202 bool success = true;
203
204 try
205 {
206 term->init (argv, envv);
207 }
208 catch (const class rxvt_failure_exception &e)
209 {
210 success = false;
211 }
212
143 term->argv = argv; 213 term->log_hook = 0;
144 term->envv = envv;
145 214
146 environ = old_environ; 215 chdir ("/"); // init might change to different working directory
216
217 if (!success)
218 term->destroy ();
219
220 send ("END"); send (success ? 1 : 0);
147 } 221 }
148 } 222 }
223 else if (!strcmp (tok, "QUIT"))
224 _exit (0);
149 else 225 else
150 return err ("protocol error: request '%s' unsupported.", (char *)tok); 226 return err ("protocol error: request '%s' unsupported.\n", (char *)tok);
151 } 227 }
152 else 228 else
153 return err (); 229 return err ();
154} 230}
155 231
232#ifdef ENABLE_FRILLS
233enum {
234 SD_LISTEN_FDS_START = 3,
235};
236
237// https://www.freedesktop.org/software/systemd/man/sd_listen_fds.html
238// https://github.com/systemd/systemd/blob/main/src/libsystemd/sd-daemon/sd-daemon.c
239static int get_listen_fds ()
240{
241 const char *listen_pid = getenv ("LISTEN_PID");
242 if (!listen_pid)
243 return 0;
244
245 char *end;
246 errno = 0;
247 long pid = strtol (listen_pid, &end, 10);
248 if (errno || end == listen_pid || *end)
249 return -1;
250
251 if (getpid () != pid)
252 return 0;
253
254 const char *listen_fds = getenv ("LISTEN_FDS");
255 if (!listen_fds)
256 return 0;
257
258 errno = 0;
259 long n = strtol (listen_fds, &end, 10);
260 if (errno || end == listen_fds || *end)
261 return -1;
262
263 if (n <= 0 || n > INT_MAX - SD_LISTEN_FDS_START)
264 return -1;
265
266 unsetenv ("LISTEN_PID");
267 unsetenv ("LISTEN_FDS");
268 unsetenv ("LISTEN_FDNAMES");
269
270 return n;
271}
272#endif
273
156int 274int
157main (int argc, const char *const *argv) 275main (int argc, char *argv[])
158{ 276{
277 ptytty::init ();
278
279 static char opt_fork, opt_opendisplay, opt_quiet;
280#if ENABLE_PERL
281 static char *opt_eval;
282#endif
283#if ENABLE_MLOCK
284 static char opt_lock;
285#endif
286
287 for (int i = 1; i < argc; i++)
288 {
289 if (!strcmp (argv [i], "-f") || !strcmp (argv [i], "--fork"))
290 opt_fork = 1;
291 else if (!strcmp (argv [i], "-o") || !strcmp (argv [i], "--opendisplay"))
292 opt_opendisplay = 1;
293 else if (!strcmp (argv [i], "-q") || !strcmp (argv [i], "--quiet"))
294 opt_quiet = 1;
295#if ENABLE_MLOCK
296 else if (!strcmp (argv [i], "-m") || !strcmp (argv [i], "--mlock"))
297 opt_lock = 1;
298#endif
299#if ENABLE_PERL
300 else if (!strcmp (argv [i], "-e") || !strcmp (argv [i], "--eval"))
301 opt_eval = argv [++i];
302#endif
303 else
304 {
305 rxvt_log ("%s: unknown option '%s', aborting.\n", argv [0], argv [i]);
306 return EXIT_FAILURE;
307 }
308 }
309
159 rxvt_init_signals (); 310 rxvt_init ();
160 311
312#if ENABLE_PERL
313 if (opt_eval)
314 {
315 rxvt_perl.init ();
316 rxvt_perl.eval (opt_eval);
317 }
318#endif
319
320 // optionally open display and never release it.
321 if (opt_opendisplay)
322 if (const char *dpy = getenv ("DISPLAY"))
323 displays.get (dpy ? dpy : ":0"); // move string logic into rxvt_display maybe?
324
325 int fd;
326#ifdef ENABLE_FRILLS
327 int n = get_listen_fds ();
328 if (n > 1)
329 {
330 fputs ("received multiple file descriptors, aborting.\n", stderr);
331 exit (EXIT_FAILURE);
332 }
333 else if (n == 1)
334 {
335 fd = SD_LISTEN_FDS_START;
336 if (!opt_quiet)
337 {
338 printf ("rxvt-unicode daemon listening on fd.\n");
339 fflush (stdout);
340 }
341 }
342 else
343#endif
344 {
161 char *sockname = rxvt_connection::unix_sockname (); 345 char *sockname = rxvt_connection::unix_sockname ();
162 unix_listener l (sockname); 346 fd = unix_listener::open (sockname);
347 if (!opt_quiet)
348 {
163 printf ("rxvtd listening on %s.\n", sockname); 349 printf ("rxvt-unicode daemon listening on %s.\n", sockname);
350 fflush (stdout);
351 }
164 free (sockname); 352 free (sockname);
353 }
165 354
166 iom.loop (); 355 unix_listener l (fd);
167 356
168#if 0 357 chdir ("/");
169 if (rxvt_init (argc, argv) == NULL) 358
359 pid_t pid = 0;
360 if (opt_fork)
361 {
362 pid = fork ();
363 }
364
365#if ENABLE_MLOCK
366 // Optionally perform an mlockall so this process does not get swapped out.
367 if (opt_lock && !pid)
368 if (mlockall (MCL_CURRENT | MCL_FUTURE) < 0)
369 perror ("unable to lock into ram");
370#endif
371
372 if (opt_fork)
373 {
374 if (pid < 0)
375 {
376 rxvt_log ("unable to fork daemon, aborting.\n");
170 return EXIT_FAILURE; 377 return EXIT_FAILURE;
378 }
379 else if (pid > 0)
380 _exit (EXIT_SUCCESS);
171 381
172 dR; 382 ev_loop_fork (EV_DEFAULT_UC);
173 rxvt_main_loop (aR); /* main processing loop */ 383 }
174#endif 384
385 ev_run ();
386
175 return EXIT_SUCCESS; 387 return EXIT_SUCCESS;
176} 388}
177 389

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