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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 1.66 by sf-exg, Sat Jun 26 14:44:30 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 "rxvt.h"
47#include "rxvtdaemon.h"
48#include "libptytty.h"
17 49
18struct server : rxvt_connection { 50struct server : rxvt_connection
51{
52 log_callback log_cb;
53 getfd_callback getfd_cb;
54
19 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);
20 58
21 server (int fd) 59 server (int fd)
22 : read_ev (this, &server::read_cb)
23 { 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
24 this->fd = fd; 65 this->fd = fd;
66 fcntl (fd, F_SETFD, FD_CLOEXEC);
67 fcntl (fd, F_SETFL, 0);
25 read_ev.start (fd, EVENT_READ); 68 read_ev.start (fd, ev::READ);
26 } 69 }
27 70
28 void err (const char *format = 0, ...); 71 void err (const char *format = 0, ...);
29}; 72};
30 73
31struct listener { 74struct unix_listener
75{
32 int fd; 76 int fd;
33 77
34 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;
35 79
36 listener (); 80 unix_listener (int fd);
81 static int open (const char *sockname);
37}; 82};
38 83
39listener::listener () 84unix_listener::unix_listener (int fd) : fd (fd)
40: accept_ev (this, &listener::accept_cb)
41{ 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
92int unix_listener::open (const char *sockname)
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;
42 if ((fd = socket (PF_LOCAL, SOCK_STREAM, 0)) < 0) 103 if ((fd = socket (AF_UNIX, SOCK_STREAM, 0)) < 0)
43 { 104 {
44 perror ("unable to create listening socket"); 105 perror ("unable to create listening socket");
45 exit (EXIT_FAILURE); 106 exit (EXIT_FAILURE);
46 } 107 }
47 108
48 sockaddr_un sa;
49
50 sa.sun_family = AF_UNIX; 109 sa.sun_family = AF_UNIX;
51 strcpy (sa.sun_path, rxvt_connection::unix_sockname ()); 110 strcpy (sa.sun_path, sockname);
52 111
53 unlink (rxvt_connection::unix_sockname ()); 112 unlink (sockname);
113
114 mode_t omask = umask (0077);
54 115
55 if (bind (fd, (sockaddr *)&sa, sizeof (sa))) 116 if (bind (fd, (sockaddr *)&sa, sizeof (sa)))
56 { 117 {
57 perror ("unable to bind listening socket"); 118 perror ("unable to bind listening socket");
58 exit (EXIT_FAILURE); 119 exit (EXIT_FAILURE);
59 } 120 }
60 121
122 umask (omask);
123
61 if (listen (fd, 5)) 124 if (listen (fd, 5))
62 { 125 {
63 perror ("unable to listen on socket"); 126 perror ("unable to listen on socket");
64 exit (EXIT_FAILURE); 127 exit (EXIT_FAILURE);
65 } 128 }
66 129
67 accept_ev.start (fd, EVENT_READ); 130 return fd;
68} 131}
69 132
70void listener::accept_cb (io_watcher &w, short revents) 133void unix_listener::accept_cb (ev::io &w, int revents)
71{ 134{
72 int fd2 = accept (fd, 0, 0); 135 int fd2 = accept (fd, 0, 0);
73 136
74 if (fd2 >= 0) 137 if (fd2 >= 0)
75 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);
76} 151}
77 152
78void server::err (const char *format, ...) 153void server::err (const char *format, ...)
79{ 154{
80 if (format) 155 if (format)
… …
84 va_list ap; 159 va_list ap;
85 va_start (ap, format); 160 va_start (ap, format);
86 vsnprintf (err, 1024, format, ap); 161 vsnprintf (err, 1024, format, ap);
87 va_end (ap); 162 va_end (ap);
88 163
164 log_msg (err);
165 }
166
89 send ("ERR"), send (err); 167 send ("END"), send (0);
90 }
91
92 close (fd); 168 close (fd);
93 delete this; 169 delete this;
94} 170}
95 171
96void server::read_cb (io_watcher &w, short revents) 172void server::read_cb (ev::io &w, int revents)
97{ 173{
98 auto_str tok; 174 auto_str tok;
99 175
100 if (recv (tok)) 176 if (recv (tok))
101 { 177 {
102 if (!strcmp (tok, "NEW")) 178 if (!strcmp (tok, "NEW"))
103 { 179 {
104 stringvec argv; 180 stringvec *argv = new stringvec;
105 stringvec envv; 181 stringvec *envv = new stringvec;
106 182
107 for (;;) 183 for (;;)
108 { 184 {
109 if (!recv (tok)) 185 if (!recv (tok))
110 return err (); 186 return err ();
111 187
112 if (!strcmp (tok, "END")) 188 if (!strcmp (tok, "END"))
113 break; 189 break;
114 else if (!strcmp (tok, "ENV") && recv (tok)) 190 else if (!strcmp (tok, "ENV") && recv (tok))
115 envv.push_back (tok.get ()); 191 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)) 192 else if (!strcmp (tok, "ARG") && recv (tok))
123 argv.push_back (tok.get ()); 193 argv->push_back (strdup (tok));
124 else 194 else
125 return err ("protocol error: unexpected NEW token"); 195 return err ("protocol error: unexpected NEW token.\n");
126 } 196 }
127 197
128 envv.push_back (0);
129
130 { 198 {
131 char **old_environ = environ; 199 rxvt_term *term = new rxvt_term;
132 environ = envv.begin ();
133 200
134 rxvt_init (argv.size (), argv.begin ()); 201 term->log_hook = &log_cb;
202 term->getfd_hook = &getfd_cb;
135 203
136 environ = old_environ; 204 bool success = true;
137 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 std::exception &e)
211 {
212 log_msg (e.what());
213 success = false;
214 }
215
216 term->log_hook = 0;
217
218 chdir ("/"); // init might change to different working directory
219
220 if (!success)
221 term->destroy ();
222
223 send ("END"); send (success ? 1 : 0);
138 } 224 }
139 } 225 }
226 else if (!strcmp (tok, "QUIT"))
227 _exit (0);
140 else 228 else
141 return err ("protocol error: request '%s' unsupported.", (char *)tok); 229 return err ("protocol error: request '%s' unsupported.\n", (char *)tok);
142 } 230 }
143 else 231 else
144 return err (); 232 return err ();
145} 233}
146 234
235#ifdef ENABLE_FRILLS
236enum {
237 SD_LISTEN_FDS_START = 3,
238};
239
240// https://www.freedesktop.org/software/systemd/man/sd_listen_fds.html
241// https://github.com/systemd/systemd/blob/main/src/libsystemd/sd-daemon/sd-daemon.c
242static int get_listen_fds ()
243{
244 const char *listen_pid = getenv ("LISTEN_PID");
245 if (!listen_pid)
246 return 0;
247
248 char *end;
249 errno = 0;
250 long pid = strtol (listen_pid, &end, 10);
251 if (errno || end == listen_pid || *end)
252 return -1;
253
254 if (getpid () != pid)
255 return 0;
256
257 const char *listen_fds = getenv ("LISTEN_FDS");
258 if (!listen_fds)
259 return 0;
260
261 errno = 0;
262 long n = strtol (listen_fds, &end, 10);
263 if (errno || end == listen_fds || *end)
264 return -1;
265
266 if (n <= 0 || n > INT_MAX - SD_LISTEN_FDS_START)
267 return -1;
268
269 unsetenv ("LISTEN_PID");
270 unsetenv ("LISTEN_FDS");
271 unsetenv ("LISTEN_FDNAMES");
272
273 return n;
274}
275#endif
276
147int 277int
148main(int argc, const char *const *argv) 278main (int argc, char *argv[])
149{ 279{
150 listener l; 280 try
151
152 { 281 {
153 sigset_t ss; 282 ptytty::init ();
154
155 sigaddset (&ss, SIGHUP);
156 sigprocmask (SIG_BLOCK, &ss, 0);
157 } 283 }
158 284 catch (const std::exception &e)
159 printf ("rxvtd running.\n"); 285 {
160 iom.loop (); 286 fputs (e.what (), stderr);
161
162#if 0
163 if (rxvt_init(argc, argv) == NULL)
164 return EXIT_FAILURE; 287 return EXIT_FAILURE;
288 }
165 289
166 dR; 290 static char opt_fork, opt_opendisplay, opt_quiet;
167 rxvt_main_loop(aR); /* main processing loop */ 291#if ENABLE_PERL
292 static char *opt_eval;
168#endif 293#endif
294#if ENABLE_MLOCK
295 static char opt_lock;
296#endif
297
298 for (int i = 1; i < argc; i++)
299 {
300 if (!strcmp (argv [i], "-f") || !strcmp (argv [i], "--fork"))
301 opt_fork = 1;
302 else if (!strcmp (argv [i], "-o") || !strcmp (argv [i], "--opendisplay"))
303 opt_opendisplay = 1;
304 else if (!strcmp (argv [i], "-q") || !strcmp (argv [i], "--quiet"))
305 opt_quiet = 1;
306#if ENABLE_MLOCK
307 else if (!strcmp (argv [i], "-m") || !strcmp (argv [i], "--mlock"))
308 opt_lock = 1;
309#endif
310#if ENABLE_PERL
311 else if (!strcmp (argv [i], "-e") || !strcmp (argv [i], "--eval"))
312 opt_eval = argv [++i];
313#endif
314 else
315 {
316 rxvt_log ("%s: unknown option '%s', aborting.\n", argv [0], argv [i]);
317 return EXIT_FAILURE;
318 }
319 }
320
321 rxvt_init ();
322
323#if ENABLE_PERL
324 if (opt_eval)
325 {
326 rxvt_perl.init ();
327 rxvt_perl.eval (opt_eval);
328 }
329#endif
330
331 // optionally open display and never release it.
332 if (opt_opendisplay)
333 if (const char *dpy = getenv ("DISPLAY"))
334 displays.get (dpy ? dpy : ":0"); // move string logic into rxvt_display maybe?
335
336 int fd;
337#ifdef ENABLE_FRILLS
338 int n = get_listen_fds ();
339 if (n > 1)
340 {
341 fputs ("received multiple file descriptors, aborting.\n", stderr);
342 exit (EXIT_FAILURE);
343 }
344 else if (n == 1)
345 {
346 fd = SD_LISTEN_FDS_START;
347 if (!opt_quiet)
348 {
349 printf ("rxvt-unicode daemon listening on fd.\n");
350 fflush (stdout);
351 }
352 }
353 else
354#endif
355 {
356 char *sockname = rxvt_connection::unix_sockname ();
357 fd = unix_listener::open (sockname);
358 if (!opt_quiet)
359 {
360 printf ("rxvt-unicode daemon listening on %s.\n", sockname);
361 fflush (stdout);
362 }
363 free (sockname);
364 }
365
366 unix_listener l (fd);
367
368 chdir ("/");
369
370 pid_t pid = 0;
371 if (opt_fork)
372 {
373 pid = fork ();
374 }
375
376#if ENABLE_MLOCK
377 // Optionally perform an mlockall so this process does not get swapped out.
378 if (opt_lock && !pid)
379 if (mlockall (MCL_CURRENT | MCL_FUTURE) < 0)
380 perror ("unable to lock into ram");
381#endif
382
383 if (opt_fork)
384 {
385 if (pid < 0)
386 {
387 rxvt_log ("unable to fork daemon, aborting.\n");
388 return EXIT_FAILURE;
389 }
390 else if (pid > 0)
391 _exit (EXIT_SUCCESS);
392
393 ev_loop_fork (EV_DEFAULT_UC);
394 }
395
396 ev_run ();
397
169 return EXIT_SUCCESS; 398 return EXIT_SUCCESS;
170} 399}
400

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