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Comparing rxvt-unicode/src/rxvtd.C (file contents):
Revision 1.12 by pcg, Sun Apr 4 23:52:37 2004 UTC vs.
Revision 1.66 by sf-exg, Sat Jun 26 14:44:30 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>
12#include <fcntl.h> 30#include <fcntl.h>
13#include <sys/types.h> 31#include <sys/types.h>
14#include <sys/stat.h> 32#include <sys/stat.h>
15#include <sys/socket.h> 33#include <sys/socket.h>
16#include <sys/un.h> 34#include <sys/un.h>
17 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
18#include <cerrno> 44#include <errno.h>
19 45
20extern char **environ; 46#include "rxvt.h"
47#include "rxvtdaemon.h"
48#include "libptytty.h"
21 49
22struct server : rxvt_connection { 50struct server : rxvt_connection
51{
23 log_callback log_cb; 52 log_callback log_cb;
53 getfd_callback getfd_cb;
24 54
25 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;
26 void log_msg (const char *msg); 56 void log_msg (const char *msg);
57 int getfd (int remote_fd);
27 58
28 server (int fd) 59 server (int fd)
29 : read_ev (this, &server::read_cb),
30 log_cb (this, &server::log_msg)
31 { 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
32 this->fd = fd; 65 this->fd = fd;
66 fcntl (fd, F_SETFD, FD_CLOEXEC);
67 fcntl (fd, F_SETFL, 0);
33 read_ev.start (fd, EVENT_READ); 68 read_ev.start (fd, ev::READ);
34 } 69 }
35 70
36 void err (const char *format = 0, ...); 71 void err (const char *format = 0, ...);
37}; 72};
38 73
39struct unix_listener { 74struct unix_listener
75{
40 int fd; 76 int fd;
41 77
42 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;
43 79
80 unix_listener (int fd);
44 unix_listener (const char *sockname); 81 static int open (const char *sockname);
45}; 82};
46 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
47unix_listener::unix_listener (const char *sockname) 92int unix_listener::open (const char *sockname)
48: accept_ev (this, &unix_listener::accept_cb)
49{ 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;
50 if ((fd = socket (PF_LOCAL, SOCK_STREAM, 0)) < 0) 103 if ((fd = socket (AF_UNIX, SOCK_STREAM, 0)) < 0)
51 { 104 {
52 perror ("unable to create listening socket"); 105 perror ("unable to create listening socket");
53 exit (EXIT_FAILURE); 106 exit (EXIT_FAILURE);
54 } 107 }
55 108
56 fcntl (fd, F_SETFD, FD_CLOEXEC);
57
58 sockaddr_un sa;
59
60 sa.sun_family = AF_UNIX; 109 sa.sun_family = AF_UNIX;
61 strcpy (sa.sun_path, sockname); 110 strcpy (sa.sun_path, sockname);
62 111
63 unlink (rxvt_connection::unix_sockname ()); 112 unlink (sockname);
64 113
65 mode_t omask = umask (0077); 114 mode_t omask = umask (0077);
66 115
67 if (bind (fd, (sockaddr *)&sa, sizeof (sa))) 116 if (bind (fd, (sockaddr *)&sa, sizeof (sa)))
68 { 117 {
… …
76 { 125 {
77 perror ("unable to listen on socket"); 126 perror ("unable to listen on socket");
78 exit (EXIT_FAILURE); 127 exit (EXIT_FAILURE);
79 } 128 }
80 129
81 accept_ev.start (fd, EVENT_READ); 130 return fd;
82} 131}
83 132
84void unix_listener::accept_cb (io_watcher &w, short revents) 133void unix_listener::accept_cb (ev::io &w, int revents)
85{ 134{
86 int fd2 = accept (fd, 0, 0); 135 int fd2 = accept (fd, 0, 0);
87 136
88 if (fd2 >= 0) 137 if (fd2 >= 0)
89 {
90 fcntl (fd2, F_SETFD, FD_CLOEXEC);
91 new server (fd2); 138 new server (fd2);
92 } 139}
140
141int server::getfd (int remote_fd)
142{
143 send ("GETFD");
144 send (remote_fd);
145 return ptytty::recv_fd (fd);
93} 146}
94 147
95void server::log_msg (const char *msg) 148void server::log_msg (const char *msg)
96{ 149{
97 send ("MSG"), send (msg); 150 send ("MSG"), send (msg);
… …
106 va_list ap; 159 va_list ap;
107 va_start (ap, format); 160 va_start (ap, format);
108 vsnprintf (err, 1024, format, ap); 161 vsnprintf (err, 1024, format, ap);
109 va_end (ap); 162 va_end (ap);
110 163
111 send ("MSG"), send (err); 164 log_msg (err);
112 } 165 }
113 166
114 send ("END", 0); 167 send ("END"), send (0);
115 close (fd); 168 close (fd);
116 delete this; 169 delete this;
117} 170}
118 171
119void server::read_cb (io_watcher &w, short revents) 172void server::read_cb (ev::io &w, int revents)
120{ 173{
121 auto_str tok; 174 auto_str tok;
122 175
123 if (recv (tok)) 176 if (recv (tok))
124 { 177 {
125 if (!strcmp (tok, "NEW")) 178 if (!strcmp (tok, "NEW"))
126 { 179 {
127 stringvec *argv = new stringvec; 180 stringvec *argv = new stringvec;
128 stringvec *envv = new stringvec; 181 stringvec *envv = new stringvec;
129 182
130 for (;;) 183 for (;;)
131 { 184 {
132 if (!recv (tok)) 185 if (!recv (tok))
133 return err (); 186 return err ();
134 187
135 if (!strcmp (tok, "END")) 188 if (!strcmp (tok, "END"))
136 break; 189 break;
137 else if (!strcmp (tok, "ENV") && recv (tok)) 190 else if (!strcmp (tok, "ENV") && recv (tok))
138 envv->push_back (tok.get ()); 191 envv->push_back (strdup (tok));
139 else if (!strcmp (tok, "CWD") && recv (tok))
140 {
141 if (chdir (tok))
142 err ("unable to change to working directory to '%s': %s",
143 (char *)tok, strerror (errno));
144 }
145 else if (!strcmp (tok, "ARG") && recv (tok)) 192 else if (!strcmp (tok, "ARG") && recv (tok))
146 argv->push_back (tok.get ()); 193 argv->push_back (strdup (tok));
147 else 194 else
148 return err ("protocol error: unexpected NEW token"); 195 return err ("protocol error: unexpected NEW token.\n");
149 } 196 }
150 197
151 envv->push_back (0);
152
153 { 198 {
154 char **old_environ = environ;
155 environ = envv->begin ();
156
157 rxvt_term *term = new rxvt_term; 199 rxvt_term *term = new rxvt_term;
158 200
159 term->log_hook = &log_cb; 201 term->log_hook = &log_cb;
160 term->argv = argv; 202 term->getfd_hook = &getfd_cb;
161 term->envv = envv;
162 203
163 bool success; 204 bool success = true;
164 205
165 try 206 try
166 { 207 {
167 success = term->init (argv->size (), argv->begin ()); 208 term->init (argv, envv);
168 } 209 }
169 catch (const class rxvt_failure_exception &e) 210 catch (const std::exception &e)
170 { 211 {
212 log_msg (e.what());
171 success = false; 213 success = false;
172 } 214 }
173 215
174 environ = old_environ; 216 term->log_hook = 0;
217
218 chdir ("/"); // init might change to different working directory
175 219
176 if (!success) 220 if (!success)
177 term->destroy (); 221 term->destroy ();
178 222
179 send ("END"); send (success ? 1 : 0); 223 send ("END"); send (success ? 1 : 0);
180 } 224 }
181 } 225 }
226 else if (!strcmp (tok, "QUIT"))
227 _exit (0);
182 else 228 else
183 return err ("protocol error: request '%s' unsupported.", (char *)tok); 229 return err ("protocol error: request '%s' unsupported.\n", (char *)tok);
184 } 230 }
185 else 231 else
186 return err (); 232 return err ();
187} 233}
188 234
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
189int 277int
190main (int argc, const char *const *argv) 278main (int argc, char *argv[])
191{ 279{
192 rxvt_init_signals (); 280 try
193 281 {
194 char *sockname = rxvt_connection::unix_sockname (); 282 ptytty::init ();
195 unix_listener l (sockname); 283 }
196 printf ("rxvtd listening on %s.\n", sockname); 284 catch (const std::exception &e)
197 free (sockname); 285 {
198 286 fputs (e.what (), stderr);
199 iom.loop ();
200
201#if 0
202 if (rxvt_init (argc, argv) == NULL)
203 return EXIT_FAILURE; 287 return EXIT_FAILURE;
288 }
204 289
205 dR; 290 static char opt_fork, opt_opendisplay, opt_quiet;
206 rxvt_main_loop (aR); /* main processing loop */ 291#if ENABLE_PERL
292 static char *opt_eval;
207#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
208 return EXIT_SUCCESS; 398 return EXIT_SUCCESS;
209} 399}
210 400

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