5 * (c) 2001 Straylight/Edgeware
8 /*----- Licensing notice --------------------------------------------------*
10 * This file is part of Trivial IP Encryption (TrIPE).
12 * TrIPE is free software: you can redistribute it and/or modify it under
13 * the terms of the GNU General Public License as published by the Free
14 * Software Foundation; either version 3 of the License, or (at your
15 * option) any later version.
17 * TrIPE is distributed in the hope that it will be useful, but WITHOUT
18 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
22 * You should have received a copy of the GNU General Public License
23 * along with TrIPE. If not, see <https://www.gnu.org/licenses/>.
26 /*----- Header files ------------------------------------------------------*/
38 #include <sys/types.h>
45 #include <sys/socket.h>
47 #include <arpa/inet.h>
50 #include <mLib/alloc.h>
51 #include <mLib/daemonize.h>
52 #include <mLib/darray.h>
53 #include <mLib/dstr.h>
54 #include <mLib/macros.h>
55 #include <mLib/mdup.h>
56 #include <mLib/mdwopt.h>
57 #include <mLib/quis.h>
58 #include <mLib/report.h>
60 #include <mLib/selbuf.h>
63 #include <mLib/versioncmp.h>
69 /*----- Data structures ---------------------------------------------------*/
73 DA_DECL(string_v
, char *);
76 /*----- Static variables --------------------------------------------------*/
79 static const char *pidfile
= 0;
80 static const char *logname
= 0;
81 static FILE *logfp
= 0;
82 static unsigned f
= 0;
83 static const char *watch
= 0;
85 static const char *bgtag
= 0;
90 #define f_spawnopts 8u
97 #define f_nostamp 1024u
99 /*----- Main code ---------------------------------------------------------*/
101 static void reap(int sig
)
104 while (waitpid(-1, 0, WNOHANG
) > 0)
109 static void writelog(const char *cat
, const char *msg
)
113 struct tm
*tm
= localtime(&t
);
114 if (f
& f_nostamp
) buf
[0] = 0;
115 else strftime(buf
, sizeof(buf
), "%Y-%m-%d %H:%M:%S ", tm
);
116 fprintf(logfp
, "%s%s: %s\n", buf
, cat
, msg
);
119 static void checkbg(char **p
)
121 char *q
= str_getword(p
);
123 die(EXIT_FAILURE
, "missing background tag");
124 if (!bgtag
|| strcmp(bgtag
, q
) != 0)
125 die(EXIT_FAILURE
, "unexpected background tag `%s'", q
);
128 static void PRINTF_LIKE(2, 3) dolog(int prio
, const char *msg
, ...)
135 dstr_vputf(&d
, msg
, &ap
);
137 if (f
& f_syslog
) syslog(prio
, "%s", d
.buf
);
140 case LOG_WARNING
: cat
= "warning"; break;
141 case LOG_DEBUG
: cat
= "debug"; break;
142 case LOG_ERR
: cat
= "error"; break;
143 default: cat
= "message"; break;
145 writelog(cat
, d
.buf
);
147 if (prio
== LOG_WARNING
&& (f
& f_warn
))
148 fprintf(stderr
, "Warning: %s\n", d
.buf
);
152 static void checkfg(void)
153 { if (bgtag
) die(EXIT_FAILURE
, "unexpected foreground response"); }
155 static void cline(char *p
, size_t len
, void *b
)
160 die(EXIT_FAILURE
, "server dropped the connection");
167 if (strcmp(q
, "WARN") == 0)
168 dolog(LOG_WARNING
, "%s", p
);
169 else if (strcmp(q
, "TRACE") == 0)
170 dolog(LOG_DEBUG
, "%s", p
);
171 else if (!(f
& f_command
))
172 dolog(LOG_ERR
, "unexpected output `%s %s'", q
, p
);
173 else if (strcmp(q
, "FAIL") == 0) {
175 die(EXIT_FAILURE
, "%s", p
);
176 } else if (strcmp(q
, "INFO") == 0) {
180 } else if (strcmp(q
, "OK") == 0) {
183 } else if (strcmp(q
, "BGDETACH") == 0) {
185 die(EXIT_FAILURE
, "repeat detach");
187 } else if (strcmp(q
, "BGOK") == 0) {
190 } else if (strcmp(q
, "BGINFO") == 0) {
194 } else if (strcmp(q
, "BGFAIL") == 0) {
196 die(EXIT_FAILURE
, "%s", p
);
198 die(EXIT_FAILURE
, "unexpected output `%s %s'", q
, p
);
201 static void sline(char *p
, size_t len
, void *b
)
205 moan("server closed the connection");
212 static void uline(char *p
, size_t len
, void *b
)
221 if (write(fd
, p
, len
+ 1) != len
+ 1)
222 moan("write failed: %s", strerror(errno
));
226 static void eline(char *p
, size_t len
, void *b
)
229 dolog(LOG_WARNING
, "(stderr): %s", p
);
236 static void setup(const char *cmd
)
245 errno
= EIO
; /* Relax: be vague */
246 if (write(fd
, d
.buf
, d
.len
) != d
.len
) {
247 die(EXIT_FAILURE
, "error sending setup command `%s': %s",
248 cmd
, strerror(errno
));
252 n
= read(fd
, &ch
, 1);
254 die(EXIT_FAILURE
, "unexpected EOF during setup");
256 die(EXIT_FAILURE
, "error receiving reply to `%s': %s",
257 cmd
, strerror(errno
));
266 else if (strcmp(q
, "OK") == 0)
268 else if (strcmp(q
, "FAIL") == 0)
269 die(EXIT_FAILURE
, "setup command `%s' failed: %s", cmd
, p
);
275 static void logfile(const char *name
)
279 if (strcmp(name
, "-") == 0)
281 else if (strcmp(name
, "!") == 0)
283 else if ((fp
= fopen(name
, "a")) != 0) {
287 setvbuf(logfp
, 0, _IOLBF
, BUFSIZ
);
290 dstr_putf(&d
, "error opening logfile `%s': %s", name
, strerror(errno
));
292 writelog("error", d
.buf
);
294 die(EXIT_FAILURE
, "%s", d
.buf
);
296 syslog(LOG_ERR
, "%s", d
.buf
);
301 static void sighup(int sig
, void *v
) { logfile(logname
); }
303 static void cleanup(void) { if (pidfile
) unlink(pidfile
); }
305 static void sigdie(int sig
)
306 { cleanup(); signal(sig
, SIG_DFL
); raise(sig
); }
308 static void PRINTF_LIKE(2, 3) putarg(string_v
*av
, const char *fmt
, ...)
314 dstr_vputf(&d
, fmt
, &ap
);
317 DA_UNSHIFT(av
, xstrdup(d
.buf
));
321 static void version(FILE *fp
)
322 { pquis(fp
, "$, TrIPE version " VERSION
"\n"); }
324 static void usage(FILE *fp
)
328 $ [-w] [-OPTIONS] [COMMAND [ARGS]...]\n\
329 $ [-Dl] [-f FILE] [-OPTIONS]\n\
331 [-s] [-d DIRECTORY] [-a SOCKET] [-P PIDFILE]\n\
332 [-p PROGRAM] [-S ARG,ARG,...]\n\
336 static void help(FILE *fp
)
345 -h, --help Show this help text.\n\
346 -v, --version Show version number.\n\
347 -u, --usage Show brief usage message.\n\
349 -D, --daemon Become a background task after connecting.\n\
350 -d, --directory=DIR Select current directory [default " CONFIGDIR
"].\n\
351 -U, --setuid=USER Set uid to USER after initialization.\n\
352 -G, --setgid=GROUP Set gid to GROUP after initialization.\n\
353 -a, --admin-socket=FILE Select socket to connect to\n\
354 [default " SOCKETDIR
"/tripesock].\n\
355 -P, --pidfile=FILE Write process-id to FILE.\n\
357 -s, --spawn Start server rather than connecting.\n\
358 -p, --spawn-path=PATH Specify path to executable.\n\
359 -S, --spawn-args=ARGS Specify comma-separated arguments.\n\
361 -l, --syslog Log messages to system log.\n\
362 -f, --logfile=FILE Log messages to FILE.\n\
363 -t, --no-timestamp When logging to a file, don't emit timestamps.\n\
364 -w, --warnings Show warnings when running commands.\n\
365 -W, --watch=THINGS Watch for THINGS after connecting.\n\
369 int main(int argc
, char *argv
[])
371 const char *dir
= CONFIGDIR
;
372 const char *sock
= SOCKETDIR
"/tripesock";
373 const char *spawnpath
= "tripe";
374 string_v spawnopts
= DA_INIT
;
385 sigset_t newmask
, oldmask
;
386 struct sockaddr_un sun
;
393 if ((p
= getenv("TRIPEDIR")) != 0)
395 if ((p
= getenv("TRIPESOCK")) != 0)
398 /* --- Parse the arguments --- */
401 static const struct option opts
[] = {
402 { "help", 0, 0, 'h' },
403 { "version", 0, 0, 'v' },
404 { "usage", 0, 0, 'u' },
405 { "daemon", 0, 0, 'D' },
406 { "uid", OPTF_ARGREQ
, 0, 'U' },
407 { "setuid", OPTF_ARGREQ
, 0, 'U' },
408 { "gid", OPTF_ARGREQ
, 0, 'G' },
409 { "setgid", OPTF_ARGREQ
, 0, 'G' },
410 { "directory", OPTF_ARGREQ
, 0, 'd' },
411 { "admin-socket", OPTF_ARGREQ
, 0, 'a' },
412 { "spawn", 0, 0, 's' },
413 { "spawn-path", OPTF_ARGREQ
, 0, 'p' },
414 { "spawn-args", OPTF_ARGREQ
, 0, 'S' },
415 { "syslog", 0, 0, 'l' },
416 { "logfile", OPTF_ARGREQ
, 0, 'f' },
417 { "no-timestamp", 0, 0, 't' },
418 { "warnings", 0, 0, 'w' },
419 { "watch", OPTF_ARGREQ
, 0, 'W' },
420 { "pidfile", OPTF_ARGREQ
, 0, 'P' },
424 i
= mdwopt(argc
, argv
, "+hvuDU:G:d:a:sp:S:lwW:f:nP:t", opts
, 0, 0, 0);
438 f
|= f_daemon
| f_noinput
;
441 u
= u_getuser(optarg
, &g
);
444 g
= u_getgroup(optarg
);
460 f
|= f_spawn
| f_spawnopts
;
461 for (p
= strtok(optarg
, ","); p
; p
= strtok(0, ","))
462 DA_PUSH(&spawnopts
, p
);
465 f
|= f_syslog
| f_noinput
;
488 if ((f
& f_bogus
) || ((f
& f_noinput
) && optind
< argc
)) {
493 /* --- Set various things up --- */
496 die(EXIT_FAILURE
, "couldn't set `%s' as current directory: %s",
497 dir
, strerror(errno
));
499 if (!pidfile
&& (f
& f_daemon
) && ((f
& f_syslog
) || logname
))
500 pidfile
= "tripectl.pid";
501 if (pidfile
&& (pidfp
= fopen(pidfile
, "w")) == 0) {
502 die(EXIT_FAILURE
, "couldn't open `%s' for writing: %s",
503 pidfile
, strerror(errno
));
507 signal(SIGINT
, sigdie
);
508 signal(SIGQUIT
, sigdie
);
509 signal(SIGTERM
, sigdie
);
512 /* --- Connect to the server --- */
515 sa
.sa_handler
= reap
;
516 sigemptyset(&sa
.sa_mask
);
517 sa
.sa_flags
= SA_NOCLDSTOP
;
519 sa
.sa_flags
|= SA_RESTART
;
521 sigaction(SIGCHLD
, &sa
, 0);
523 DA_PUSH(&spawnopts
, 0);
524 if (g
!= (gid_t
)-1) putarg(&spawnopts
, "-G%lu", (unsigned long)g
);
525 if (u
!= (uid_t
)-1) putarg(&spawnopts
, "-U%lu", (unsigned long)u
);
526 putarg(&spawnopts
, "-a%s", sock
);
527 putarg(&spawnopts
, "-d.");
528 putarg(&spawnopts
, "-F");
529 putarg(&spawnopts
, "%s", spawnpath
);
530 if (socketpair(PF_UNIX
, SOCK_STREAM
, 0, pfd
) || pipe(efd
))
531 die(EXIT_FAILURE
, "error from socketpair: %s", strerror(errno
));
532 sigemptyset(&newmask
);
533 sigaddset(&newmask
, SIGCHLD
);
534 sigprocmask(SIG_BLOCK
, &newmask
, &oldmask
);
535 if ((kid
= fork()) < 0)
536 die(EXIT_FAILURE
, "fork failed: %s", strerror(errno
));
538 close(pfd
[0]); close(efd
[0]);
539 sigprocmask(SIG_SETMASK
, &oldmask
, 0);
540 md
[0].cur
= pfd
[1]; md
[0].want
= STDIN_FILENO
;
541 md
[1].cur
= pfd
[1]; md
[1].want
= STDOUT_FILENO
;
542 md
[2].cur
= efd
[1]; md
[2].want
= STDERR_FILENO
;
544 if (pidfp
) fclose(pidfp
);
546 if (f
& f_daemon
) detachtty();
547 execvp(DA(&spawnopts
)[0], DA(&spawnopts
));
548 die(127, "couldn't exec `%s': %s", spawnpath
, strerror(errno
));
550 sigprocmask(SIG_SETMASK
, &oldmask
, 0);
552 close(pfd
[1]); close(efd
[1]);
553 selbuf_init(&be
, &sel
, efd
[0], eline
, &be
);
555 sz
= strlen(sock
) + 1;
556 if (sz
> sizeof(sun
.sun_path
))
557 die(EXIT_FAILURE
, "socket name `%s' too long", sock
);
558 memset(&sun
, 0, sizeof(sun
));
559 sun
.sun_family
= AF_UNIX
;
560 memcpy(sun
.sun_path
, sock
, sz
);
561 sz
= sz
+ offsetof(struct sockaddr_un
, sun_path
);
562 if ((fd
= socket(PF_UNIX
, SOCK_STREAM
, 0)) < 0)
563 die(EXIT_FAILURE
, "error making socket: %s", strerror(errno
));
564 if (connect(fd
, (struct sockaddr
*)&sun
, sz
)) {
565 die(EXIT_FAILURE
, "error connecting to `%s': %s",
566 sun
.sun_path
, strerror(errno
));
570 f
|= f_losing
; /* pessimism */
576 die(EXIT_FAILURE
, "error becoming daemon: %s", strerror(errno
));
579 fprintf(pidfp
, "%li\n", (long)getpid());
582 signal(SIGPIPE
, SIG_IGN
);
584 /* --- If we're meant to be interactive, do that --- */
586 if (optind
== argc
) {
588 dstr_puts(&d
, "watch");
589 u_quotify(&d
, watch ? watch
: "-A+tw");
592 if (!(f
& f_noinput
) && optind
== argc
) {
593 selbuf_init(&bu
, &sel
, STDIN_FILENO
, uline
, &bu
);
594 selbuf_init(&bs
, &sel
, fd
, sline
, &bs
);
596 if (sel_select(&sel
) && errno
!= EINTR
&& errno
!= EAGAIN
)
597 die(EXIT_FAILURE
, "select failed: %s", strerror(errno
));
601 /* --- If there's a command, submit it --- */
605 dstr_puts(&d
, "watch");
606 u_quotify(&d
, watch ? watch
: (f
& f_warn
) ?
"-A+w" : "-A");
609 while (optind
< argc
)
610 u_quotify(&d
, argv
[optind
++]);
613 if (write(fd
, d
.buf
, d
.len
) != d
.len
|| shutdown(fd
, 1))
614 die(EXIT_FAILURE
, "write failed: %s", strerror(errno
));
619 /* --- Pull everything else out of the box --- */
621 selbuf_init(&bs
, &sel
, fd
, cline
, 0);
624 openlog(QUIS
, 0, LOG_DAEMON
);
626 sig_add(&hup
, SIGHUP
, sighup
, 0);
628 if (sel_select(&sel
) && errno
!= EINTR
&& errno
!= EAGAIN
)
629 die(EXIT_FAILURE
, "select failed: %s", strerror(errno
));
635 /*----- That's all, folks -------------------------------------------------*/