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Date:: Sat Jan 29 17:05:26 2022 UTC
Message:: new command pipe: fetch data and pass it as stdin of a program
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1 /*
2  * Copyright (c) 2021, 2022 Omar Polo <op@omarpolo.com>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include "compat.h"
18 
19 #include <sys/ioctl.h>
20 #include <sys/types.h>
21 #include <sys/socket.h>
22 #include <sys/stat.h>
23 #include <sys/wait.h>
24 
25 #include <assert.h>
26 #include <errno.h>
27 #include <fcntl.h>
28 #include <inttypes.h>
29 #include <netdb.h>
30 #include <libgen.h>
31 #include <limits.h>
32 #include <signal.h>
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <string.h>
36 #include <syslog.h>
37 #include <tls.h>
38 #include <unistd.h>
39 
40 #ifdef HAVE_READLINE
41 #include <readline/readline.h>
42 #include <readline/history.h>
43 #endif
44 
45 #ifndef nitems
46 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
47 #endif
48 
49 #include "kami.h"
50 #include "utils.h"
51 #include "log.h"
52 #include "9pclib.h"
53 
54 #define TMPFSTR		"/tmp/kamiftp.XXXXXXXXXX"
55 #define TMPFSTRLEN	sizeof(TMPFSTR)
56 
57 /* flags */
58 int		 tls;
59 const char	*crtpath;
60 const char	*keypath;
61 
62 /* state */
63 struct tls_config	*tlsconf;
64 struct tls		*ctx;
65 int			 sock;
66 struct evbuffer		*buf;
67 struct evbuffer		*dirbuf;
68 uint32_t		 msize;
69 int			 bell;
70 
71 volatile sig_atomic_t	 resized;
72 int			 tty_p;
73 int			 tty_width;
74 int			 xdump;
75 
76 struct progress {
77 	uint64_t	max;
78 	uint64_t	done;
79 };
80 
81 int pwdfid;
82 
83 #define ASSERT_EMPTYBUF() assert(EVBUFFER_LENGTH(buf) == 0)
84 
85 #if !HAVE_READLINE
86 char *
87 readline(const char *prompt)
88 {
89 	char *ch, *line = NULL;
90 	size_t linesize = 0;
91 	ssize_t linelen;
92 
93 	printf("%s", prompt);
94 	fflush(stdout);
95 
96 	linelen = getline(&line, &linesize, stdin);
97 	if (linelen == -1)
98 		return NULL;
99 
100 	if ((ch = strchr(line, '\n')) != NULL)
101 		*ch = '\0';
102 	return line;
103 }
104 
105 void
106 add_history(const char *line)
107 {
108 	return;
109 }
110 #endif
111 
112 static char *
113 read_line(const char *prompt)
114 {
115 	char *line;
116 
117 again:
118 	if ((line = readline(prompt)) == NULL)
119 		return NULL;
120 	/* XXX: trim spaces? */
121 	if (*line == '\0') {
122 		free(line);
123 		goto again;
124 	}
125 
126 	add_history(line);
127 	return line;
128 }
129 
130 static void
131 spawn(const char *argv0, ...)
132 {
133 	pid_t pid;
134 	size_t i;
135 	int status;
136 	const char *argv[16], *last;
137 	va_list ap;
138 
139 	memset(argv, 0, sizeof(argv));
140 
141 	va_start(ap, argv0);
142 	argv[0] = argv0;
143 	for (i = 1; i < nitems(argv); ++i) {
144 		last = va_arg(ap, const char *);
145 		if (last == NULL)
146 			break;
147 		argv[i] = last;
148 	}
149 	va_end(ap);
150 
151 	assert(last == NULL);
152 
153 	switch (pid = fork()) {
154 	case -1:
155 		err(1, "fork");
156 	case 0: /* child */
157 		execvp(argv[0], (char *const *)argv);
158 		err(1, "execvp");
159 	default:
160 		waitpid(pid, &status, 0);
161 	}
162 }
163 
164 static void
165 tty_resized(int signo)
166 {
167 	resized = 1;
168 }
169 
170 static void __dead
171 usage(int ret)
172 {
173 	fprintf(stderr, "usage: %s [-c] [-C cert] [-K key] "
174 	    "host[:port] [path]\n", getprogname());
175 	fprintf(stderr, "kamid suite version " KAMID_VERSION "\n");
176 	exit(ret);
177 }
178 
179 static int
180 nextfid(void)
181 {
182 	uint32_t i;
183 
184 	for (i = 0; ; ++i) {
185 		if (i != pwdfid)
186 			return i;
187 	}
188 }
189 
190 static void
191 do_send(void)
192 {
193 	const void	*buf;
194 	size_t		 nbytes;
195 	ssize_t		 r;
196 
197 	if (xdump)
198 		hexdump("outgoing message", EVBUFFER_DATA(evb),
199 		    EVBUFFER_LENGTH(evb));
200 
201 	while (EVBUFFER_LENGTH(evb) != 0) {
202 		buf = EVBUFFER_DATA(evb);
203 		nbytes = EVBUFFER_LENGTH(evb);
204 
205 		if (ctx == NULL) {
206 			r = write(sock, buf, nbytes);
207 			if (r == 0 || r == -1)
208 				errx(1, "EOF");
209 		} else {
210 			r = tls_write(ctx, buf, nbytes);
211 			if (r == TLS_WANT_POLLIN || r == TLS_WANT_POLLOUT)
212 				continue;
213 			if (r == -1)
214 				errx(1, "tls: %s", tls_error(ctx));
215 		}
216 
217 		evbuffer_drain(evb, r);
218 	}
219 }
220 
221 static void
222 mustread(void *d, size_t len)
223 {
224 	ssize_t r;
225 
226 	while (len != 0) {
227 		if (ctx == NULL) {
228 			r = read(sock, d, len);
229 			if (r == 0 || r == -1)
230 				errx(1, "EOF");
231 		} else {
232 			r = tls_read(ctx, d, len);
233 			if (r == TLS_WANT_POLLIN || r == TLS_WANT_POLLOUT)
234 				continue;
235 			if (r == -1)
236 				errx(1, "tls: %s", tls_error(ctx));
237 		}
238 
239 		d += r;
240 		len -= r;
241 	}
242 }
243 
244 static void
245 recv_msg(void)
246 {
247 	uint32_t	len, l;
248 	char		tmp[BUFSIZ];
249 
250 	mustread(&len, sizeof(len));
251 	len = le32toh(len);
252 	if (len < HEADERSIZE)
253 		errx(1, "read message of invalid length %d", len);
254 
255 	len -= 4; /* skip the length just read */
256 
257 	while (len != 0) {
258 		l = MIN(len, sizeof(tmp));
259 		mustread(tmp, l);
260 		len -= l;
261 		evbuffer_add(buf, tmp, l);
262 	}
263 
264 	if (xdump)
265 		hexdump("incoming packet", EVBUFFER_DATA(buf),
266 		    EVBUFFER_LENGTH(buf));
267 }
268 
269 static uint64_t
270 np_read64(struct evbuffer *buf)
271 {
272 	uint64_t n;
273 
274 	evbuffer_remove(buf, &n, sizeof(n));
275 	return le64toh(n);
276 }
277 
278 static uint32_t
279 np_read32(struct evbuffer *buf)
280 {
281 	uint32_t n;
282 
283 	evbuffer_remove(buf, &n, sizeof(n));
284 	return le32toh(n);
285 }
286 
287 static uint16_t
288 np_read16(struct evbuffer *buf)
289 {
290 	uint16_t n;
291 
292 	evbuffer_remove(buf, &n, sizeof(n));
293 	return le16toh(n);
294 }
295 
296 static uint16_t
297 np_read8(struct evbuffer *buf)
298 {
299 	uint8_t n;
300 
301 	evbuffer_remove(buf, &n, sizeof(n));
302 	return n;
303 }
304 
305 static char *
306 np_readstr(struct evbuffer *buf)
307 {
308 	uint16_t	 len;
309 	char		*str;
310 
311 	len = np_read16(buf);
312 	assert(EVBUFFER_LENGTH(buf) >= len);
313 
314 	if ((str = calloc(1, len+1)) == NULL)
315 		err(1, "calloc");
316 	evbuffer_remove(buf, str, len);
317 	return str;
318 }
319 
320 static void
321 np_read_qid(struct evbuffer *buf, struct qid *qid)
322 {
323 	assert(EVBUFFER_LENGTH(buf) >= QIDSIZE);
324 
325 	qid->type = np_read8(buf);
326 	qid->vers = np_read32(buf);
327 	qid->path = np_read64(buf);
328 }
329 
330 static int
331 np_read_stat(struct evbuffer *buf, struct np_stat *st)
332 {
333 	uint16_t size;
334 
335 	memset(st, 0, sizeof(*st));
336 
337 	size = np_read16(buf);
338 	if (size > EVBUFFER_LENGTH(buf))
339 		return -1;
340 
341 	st->type = np_read16(buf);
342 	st->dev = np_read32(buf);
343 	np_read_qid(buf, &st->qid);
344 	st->mode = np_read32(buf);
345 	st->atime = np_read32(buf);
346 	st->mtime = np_read32(buf);
347 	st->length = np_read64(buf);
348 	st->name = np_readstr(buf);
349 	st->uid = np_readstr(buf);
350 	st->gid = np_readstr(buf);
351 	st->muid = np_readstr(buf);
352 
353 	return 0;
354 }
355 
356 static void
357 expect(uint8_t type)
358 {
359 	uint8_t t;
360 
361 	t = np_read8(buf);
362 	if (t == type)
363 		return;
364 
365 	if (t == Rerror) {
366 		char *err;
367 
368 		/* skip tag */
369 		np_read16(buf);
370 
371 		err = np_readstr(buf);
372 		errx(1, "expected %s, got error %s",
373 		    pp_msg_type(type), err);
374 	}
375 
376 	errx(1, "expected %s, got msg type %s",
377 	    pp_msg_type(type), pp_msg_type(t));
378 }
379 
380 static void
381 expect2(uint8_t type, uint16_t tag)
382 {
383 	uint16_t t;
384 
385 	expect(type);
386 
387 	t = np_read16(buf);
388 	if (t == tag)
389 		return;
390 
391 	errx(1, "expected tag 0x%x, got 0x%x", tag, t);
392 }
393 
394 static char *
395 check(uint8_t type, uint16_t tag)
396 {
397 	uint16_t rtag;
398 	uint8_t rtype;
399 
400 	rtype = np_read8(buf);
401 	rtag = np_read16(buf);
402 	if (rtype == type) {
403 		if (rtag != tag)
404 			errx(1, "expected tag 0x%x, got 0x%x", tag, rtag);
405 		return NULL;
406 	}
407 
408 	if (rtype == Rerror)
409 		return np_readstr(buf);
410 
411 	errx(1, "expected %s, got msg type %s",
412 	    pp_msg_type(type), pp_msg_type(rtype));
413 }
414 
415 static void
416 do_version(void)
417 {
418 	char		*version;
419 
420 	tversion(VERSION9P, MSIZE9P);
421 	do_send();
422 	recv_msg();
423 	expect2(Rversion, NOTAG);
424 
425 	msize = np_read32(buf);
426 	version = np_readstr(buf);
427 
428 	if (msize > MSIZE9P)
429 		errx(1, "got unexpected msize: %d", msize);
430 	if (strcmp(version, VERSION9P))
431 		errx(1, "unexpected 9p version: %s", version);
432 
433 	free(version);
434 	ASSERT_EMPTYBUF();
435 }
436 
437 static void
438 do_attach(const char *path)
439 {
440 	const char *user;
441 	struct qid qid;
442 
443 	if (path == NULL)
444 		path = "/";
445 	if ((user = getenv("USER")) == NULL)
446 		user = "flan";
447 
448 	tattach(pwdfid, NOFID, user, path);
449 	do_send();
450 	recv_msg();
451 	expect2(Rattach, iota_tag);
452 	np_read_qid(buf, &qid);
453 
454 	ASSERT_EMPTYBUF();
455 }
456 
457 static uint32_t
458 do_open(uint32_t fid, uint8_t mode)
459 {
460 	struct qid qid;
461 	uint32_t iounit;
462 
463 	topen(fid, mode);
464 	do_send();
465 	recv_msg();
466 	expect2(Ropen, iota_tag);
467 
468 	np_read_qid(buf, &qid);
469 	iounit = np_read32(buf);
470 
471 	ASSERT_EMPTYBUF();
472 
473 	return iounit;
474 }
475 
476 static uint32_t
477 do_create(uint32_t fid, const char *name, uint32_t perm, uint8_t mode)
478 {
479 	struct qid qid;
480 	uint32_t iounit;
481 
482 	tcreate(fid, name, perm, mode);
483 	do_send();
484 	recv_msg();
485 	expect2(Rcreate, iota_tag);
486 
487 	np_read_qid(buf, &qid);
488 	iounit = np_read32(buf);
489 
490 	ASSERT_EMPTYBUF();
491 
492 	return iounit;
493 }
494 
495 static void
496 do_clunk(uint32_t fid)
497 {
498 	tclunk(fid);
499 	do_send();
500 	recv_msg();
501 	expect2(Rclunk, iota_tag);
502 
503 	ASSERT_EMPTYBUF();
504 }
505 
506 static char *
507 dup_fid(int fid, int nfid)
508 {
509 	uint16_t nwqid;
510 	char *errstr;
511 
512 	twalk(fid, nfid, NULL, 0);
513 	do_send();
514 	recv_msg();
515 
516 	if ((errstr = check(Rwalk, iota_tag)) != NULL)
517 		return errstr;
518 
519 	nwqid = np_read16(buf);
520 	assert(nwqid == 0);
521 
522 	ASSERT_EMPTYBUF();
523 
524 	return NULL;
525 }
526 
527 static char *
528 walk_path(int fid, int newfid, const char *path, int *missing,
529     struct qid *qid)
530 {
531 	char *wnames[MAXWELEM], *p, *t, *errstr;
532 	size_t nwname, i;
533 	uint16_t nwqid;
534 
535 	if ((p = strdup(path)) == NULL)
536 		err(1, "strdup");
537 	t = p;
538 
539 	/* strip initial ./ */
540 	if (t[0] == '.' && t[1] == '/')
541 		t += 2;
542 
543 	for (nwname = 0; nwname < nitems(wnames) &&
544 	    (wnames[nwname] = strsep(&t, "/")) != NULL;) {
545 		if (*wnames[nwname] != '\0')
546 			nwname++;
547 	}
548 
549 	twalk(fid, newfid, (const char **)wnames, nwname);
550 	do_send();
551 	recv_msg();
552 
553 	*missing = nwname;
554 	if ((errstr = check(Rwalk, iota_tag)) != NULL) {
555 		free(p);
556 		return errstr;
557 	}
558 
559 	nwqid = np_read16(buf);
560 	assert(nwqid <= nwname);
561 
562 	/* consume all qids */
563 	for (i = 0; i < nwqid; ++i)
564 		np_read_qid(buf, qid);
565 
566 	free(p);
567 
568 	*missing = nwname - nwqid;
569 	return NULL;
570 }
571 
572 static void
573 do_stat(int fid, struct np_stat *st)
574 {
575 	tstat(fid);
576 	do_send();
577 	recv_msg();
578 	expect2(Rstat, iota_tag);
579 
580 	if (np_read_stat(buf, st) == -1)
581 		errx(1, "invalid stat struct read");
582 
583 	ASSERT_EMPTYBUF();
584 }
585 
586 static char *
587 do_wstat(int fid, const struct np_stat *st)
588 {
589 	char *errstr;
590 
591 	twstat(fid, st);
592 	do_send();
593 	recv_msg();
594 
595 	if ((errstr = check(Rwstat, iota_tag)) != NULL)
596 		return errstr;
597 
598 	ASSERT_EMPTYBUF();
599 
600 	return NULL;
601 }
602 
603 static size_t
604 do_read(int fid, uint64_t off, uint32_t count, void *data)
605 {
606 	uint32_t r;
607 
608 	tread(fid, off, count);
609 	do_send();
610 	recv_msg();
611 	expect2(Rread, iota_tag);
612 
613 	r = np_read32(buf);
614 	assert(r == EVBUFFER_LENGTH(buf));
615 	assert(r <= count);
616 	evbuffer_remove(buf, data, r);
617 
618 	ASSERT_EMPTYBUF();
619 
620 	return r;
621 }
622 
623 static size_t
624 do_write(int fid, uint64_t off, uint32_t count, void *data)
625 {
626 	uint32_t r;
627 
628 	twrite(fid, off, data, count);
629 	do_send();
630 	recv_msg();
631 	expect2(Rwrite, iota_tag);
632 
633 	r = np_read32(buf);
634 	assert(r <= count);
635 
636 	ASSERT_EMPTYBUF();
637 
638 	return r;
639 }
640 
641 static void
642 draw_progress(const char *pre, const struct progress *p)
643 {
644 	struct winsize ws;
645 	int i, l, w;
646 	double perc;
647 
648 	if (xdump)
649 		return;
650 
651 	perc = 100.0 * p->done / p->max;
652 	if (!tty_p) {
653 		fprintf(stderr, "%s: %d%%\n", pre, (int)perc);
654 		return;
655 	}
656 
657 	if (resized) {
658 		resized = 0;
659 
660 		if (ioctl(0, TIOCGWINSZ, &ws) == -1)
661 			return;
662 		tty_width = ws.ws_col;
663 	}
664 	w = tty_width;
665 
666 	if (pre == NULL ||
667 	    ((l = printf("\r%s ", pre)) == -1 || l >= w))
668 		return;
669 
670 	w -= l + 2 + 5; /* 2 for |, 5 for percentage + \n */
671 	if (w < 0) {
672 		printf("%4d%%\n", (int)perc);
673 		return;
674 	}
675 
676 	printf("|");
677 
678 	l = w * MIN(100.0, perc) / 100.0;
679 	for (i = 0; i < l; i++)
680 		printf("*");
681 	for (; i < w; i++)
682 		printf(" ");
683 	printf("|%4d%%", (int)perc);
684 
685 	fflush(stdout);
686 }
687 
688 static int
689 fetch_fid(int fid, int fd, const char *name)
690 {
691 	struct progress p = {0};
692 	struct np_stat st;
693 	size_t r;
694 	int ret = 0;
695 	char buf[BUFSIZ];
696 
697 	do_stat(fid, &st);
698 	do_open(fid, KOREAD);
699 
700 	p.max = st.length;
701 	for (;;) {
702 		size_t off;
703 		ssize_t nw;
704 
705 		r = do_read(fid, p.done, sizeof(buf), buf);
706 		if (r == 0)
707 			break;
708 
709 		for (off = 0; off < r; off += nw)
710 			if ((nw = write(fd, buf + off, r - off)) == 0 ||
711 			    nw == -1) {
712 				ret = -1;
713 				goto end;
714 			}
715 
716 		p.done += r;
717 		draw_progress(name, &p);
718 
719 #if 0
720 		/* throttle, for debugging purpose */
721 		{
722 			struct timespec ts = { 0, 500000000 };
723 			nanosleep(&ts, NULL);
724 		}
725 #endif
726 	}
727 
728 end:
729 	putchar('\n');
730 
731 	do_clunk(fid);
732 	return ret;
733 }
734 
735 static void
736 send_fid(int fid, const char *fnam, int open_flags, int fd, const char *name)
737 {
738 	struct progress p = {0};
739 	struct stat sb;
740 	ssize_t r;
741 	size_t w;
742 	char buf[BUFSIZ];
743 
744 	if (fstat(fd, &sb) == -1)
745 		err(1, "fstat");
746 
747 	if (fnam != NULL)
748 		do_create(fid, fnam, 0644, KOWRITE);
749 	else
750 		do_open(fid, open_flags | KOWRITE);
751 
752 	p.max = sb.st_size;
753 	for (;;) {
754 		r = read(fd, buf, sizeof(buf));
755 		if (r == 0)
756 			break;
757 		if (r == -1)
758 			err(1, "read");
759 
760 		w = do_write(fid, p.done, r, buf);
761 		p.done += w;
762 
763 		draw_progress(name, &p);
764 
765 #if 0
766 		/* throttle, for debugging purpose */
767 		{
768 			struct timespec ts = { 0, 500000000 };
769 			nanosleep(&ts, NULL);
770 		}
771 #endif
772 	}
773 
774 	putchar('\n');
775 	do_clunk(fid);
776 }
777 
778 static int
779 woc_file(int fd, const char *prompt, const char *path)
780 {
781 	struct qid qid;
782 	const char *n = NULL;
783 	char *errstr;
784 	int nfid, miss;
785 
786 	nfid = nextfid();
787 	errstr = walk_path(pwdfid, nfid, path, &miss, &qid);
788 	if (errstr != NULL && miss > 1) {
789 		printf("%s: %s\n", path, errstr);
790 		free(errstr);
791 		return -1;
792 	}
793 
794 	if (errstr != NULL || miss == 1) {
795 		char p[PATH_MAX], *dn;
796 
797 		/*
798 		 * If it's only one component missing (the file name), walk
799 		 * to the parent directory and try to create the file.
800 		 */
801 
802 		if (strlcpy(p, path, sizeof(p)) >= sizeof(p)) {
803 			printf("path too long: %s\n", path);
804 			return -1;
805 		}
806 		dn = dirname(p);
807 
808 		if (!strcmp(dn, ".")) {
809 			errstr = dup_fid(pwdfid, nfid);
810 			miss = 0;
811 		} else
812 			errstr = walk_path(pwdfid, nfid, dn, &miss, &qid);
813 
814 		if (errstr != NULL) {
815 			printf("%s: %s\n", dn, errstr);
816 			free(errstr);
817 			return -1;
818 		}
819 
820 		if (miss != 0) {
821 			printf("%s: not a directory\n", dn);
822 			return -1;
823 		}
824 
825 		if ((n = strrchr(path, '/')) != NULL)
826 			n++;
827 		else
828 			n = path;
829 	}
830 
831 	free(errstr);
832 
833 	if (miss > 1) {
834 		printf("can't create %s: missing %d path component(s)\n",
835 		    path, miss);
836 		return -1;
837 	}
838 
839 	send_fid(nfid, n, KOTRUNC, fd, prompt);
840 	return 0;
841 }
842 
843 static void
844 do_tls_connect(const char *host, const char *port)
845 {
846 	int handshake;
847 
848 	if ((tlsconf = tls_config_new()) == NULL)
849 		fatalx("tls_config_new");
850 	tls_config_insecure_noverifycert(tlsconf);
851 	tls_config_insecure_noverifyname(tlsconf);
852 	if (tls_config_set_keypair_file(tlsconf, crtpath, keypath) == -1)
853 		fatalx("can't load certs (%s, %s)", crtpath, keypath);
854 
855 	if ((ctx = tls_client()) == NULL)
856 		fatal("tls_client");
857 	if (tls_configure(ctx, tlsconf) == -1)
858 		fatalx("tls_configure: %s", tls_error(ctx));
859 
860 	if (tls_connect(ctx, host, port) == -1)
861 		fatalx("can't connect to %s:%s: %s", host, port,
862 		    tls_error(ctx));
863 
864 	for (handshake = 0; !handshake;) {
865 		switch (tls_handshake(ctx)) {
866 		case -1:
867 			fatalx("tls_handshake: %s", tls_error(ctx));
868 		case 0:
869 			handshake = 1;
870 			break;
871 		}
872 	}
873 }
874 
875 static void
876 do_ctxt_connect(const char *host, const char *port)
877 {
878 	struct addrinfo hints, *res, *res0;
879 	int error, saved_errno;
880 	const char *cause = NULL;
881 
882 	memset(&hints, 0, sizeof(hints));
883 	hints.ai_family = AF_UNSPEC;
884 	hints.ai_socktype = SOCK_STREAM;
885 	error = getaddrinfo(host, port, &hints, &res0);
886 	if (error)
887 		errx(1, "%s", gai_strerror(error));
888 
889 	sock = -1;
890 	for (res = res0; res != NULL; res = res->ai_next) {
891 		sock = socket(res->ai_family, res->ai_socktype|SOCK_CLOEXEC,
892 		    res->ai_protocol);
893 		if (sock == -1) {
894 			cause = "socket";
895 			continue;
896 		}
897 
898 		if (connect(sock, res->ai_addr, res->ai_addrlen) == -1) {
899 			cause = "connect";
900 			saved_errno = errno;
901 			close(sock);
902 			errno = saved_errno;
903 			sock = -1;
904 			continue;
905 		}
906 
907 		break;
908 	}
909 
910 	if (sock == -1)
911 		err(1, "%s", cause);
912 	freeaddrinfo(res0);
913 }
914 
915 static void
916 do_connect(const char *connspec, const char *path)
917 {
918 	char *host, *colon;
919 	const char *port;
920 
921 	host = xstrdup(connspec);
922 	if ((colon = strchr(host, ':')) != NULL) {
923 		*colon = '\0';
924 		port = ++colon;
925 	} else
926 		port = "1337";
927 
928 	printf("connecting to %s:%s...", host, port);
929 	fflush(stdout);
930 
931 	if (tls)
932 		do_tls_connect(host, port);
933 	else
934 		do_ctxt_connect(host, port);
935 
936 	printf(" done!\n");
937 
938 	do_version();
939 	do_attach(path);
940 
941 	free(host);
942 }
943 
944 static int
945 tmp_file(char sfn[TMPFSTRLEN])
946 {
947 	int tmpfd;
948 
949 	strlcpy(sfn, TMPFSTR, TMPFSTRLEN);
950 	if ((tmpfd = mkstemp(sfn)) == -1) {
951 		warn("mkstemp %s", sfn);
952 		return -1;
953 	}
954 
955 	/* set the close-on-exec flag */
956 	if (fcntl(tmpfd, F_SETFD, FD_CLOEXEC) == -1) {
957 		warn("fcntl");
958 		close(tmpfd);
959 		return -1;
960 	}
961 
962 	return tmpfd;
963 }
964 
965 static inline const char *
966 pp_perm(uint8_t x)
967 {
968 	switch (x & 0x7) {
969 	case 0x0:
970 		return "---";
971 	case 0x1:
972 		return "--x";
973 	case 0x2:
974 		return "-w-";
975 	case 0x3:
976 		return "-wx";
977 	case 0x4:
978 		return "r--";
979 	case 0x5:
980 		return "r-x";
981 	case 0x6:
982 		return "rw-";
983 	case 0x7:
984 		return "rwx";
985 	default:
986 		/* unreachable, just for the compiler' happiness */
987 		return "???";
988 	}
989 }
990 
991 static inline void
992 prepare_wstat(struct np_stat *st)
993 {
994 	memset(st, 0xFF, sizeof(*st));
995 	st->name = NULL;
996 	st->uid = NULL;
997 	st->gid = NULL;
998 	st->muid = NULL;
999 }
1000 
1001 static void
1002 cmd_bell(int argc, const char **argv)
1003 {
1004 	if (argc == 0) {
1005 		bell = !bell;
1006 		if (bell)
1007 			puts("bell mode enabled");
1008 		else
1009 			puts("bell mode disabled");
1010 		return;
1011 	}
1012 
1013 	if (argc != 1)
1014 		goto usage;
1015 
1016 	if (!strcmp(*argv, "on")) {
1017 		bell = 1;
1018 		puts("bell mode enabled");
1019 		return;
1020 	}
1021 
1022 	if (!strcmp(*argv, "off")) {
1023 		bell = 0;
1024 		puts("bell mode disabled");
1025 		return;
1026 	}
1027 
1028 usage:
1029 	printf("bell [on | off]\n");
1030 }
1031 
1032 static void
1033 cmd_bye(int argc, const char **argv)
1034 {
1035 	log_warnx("bye\n");
1036 	exit(0);
1037 }
1038 
1039 static void
1040 cmd_cd(int argc, const char **argv)
1041 {
1042 	struct qid qid;
1043 	int nfid, miss;
1044 	char *errstr;
1045 
1046 	if (argc != 1) {
1047 		printf("usage: cd remote-path\n");
1048 		return;
1049 	}
1050 
1051 	nfid = nextfid();
1052 	errstr = walk_path(pwdfid, nfid, argv[0], &miss, &qid);
1053 	if (errstr != NULL) {
1054 		printf("%s: %s\n", argv[0], errstr);
1055 		free(errstr);
1056 		return;
1057 	}
1058 
1059 	if (miss != 0 || !(qid.type & QTDIR)) {
1060 		printf("%s: not a directory\n", argv[0]);
1061 		if (miss == 0)
1062 			do_clunk(nfid);
1063 		return;
1064 	}
1065 
1066 	do_clunk(pwdfid);
1067 	pwdfid = nfid;
1068 }
1069 
1070 static void
1071 cmd_edit(int argc, const char **argv)
1072 {
1073 	struct qid qid;
1074 	int nfid, tmpfd, miss;
1075 	char sfn[TMPFSTRLEN], p[PATH_MAX], *name, *errstr;
1076 	const char *ed;
1077 
1078 	if (argc != 1) {
1079 		puts("usage: edit file");
1080 		return;
1081 	}
1082 
1083 	if ((ed = getenv("VISUAL")) == NULL &&
1084 	    (ed = getenv("EDITOR")) == NULL)
1085 		ed = "ed";
1086 
1087 	nfid = nextfid();
1088 	errstr = walk_path(pwdfid, nfid, *argv, &miss, &qid);
1089 	if (errstr != NULL) {
1090 		printf("%s: %s\n", *argv, errstr);
1091 		free(errstr);
1092 		return;
1093 	}
1094 
1095 	if (miss != 0 || qid.type != 0) {
1096 		printf("%s: not a file\n", *argv);
1097 		if (miss == 0)
1098 			do_clunk(nfid);
1099 		return;
1100 	}
1101 
1102 	if ((tmpfd = tmp_file(sfn)) == -1) {
1103 		do_clunk(nfid);
1104 		return;
1105 	}
1106 
1107 	strlcpy(p, *argv, sizeof(p));
1108 	name = basename(p);
1109 
1110 	if (fetch_fid(nfid, tmpfd, name)) {
1111 		warn("failed fetch or can't write %s", sfn);
1112 		goto end;
1113 	}
1114 	close(tmpfd);
1115 
1116 	spawn(ed, sfn, NULL);
1117 
1118 	/*
1119 	 * Re-open the file because it's not guaranteed that the
1120 	 * file descriptor tmpfd is still associated with the file
1121 	 * pointed by sfn: it's not uncommon for editor to write
1122 	 * a backup file and then rename(2) it to the file name.
1123 	 */
1124 	if ((tmpfd = open(sfn, O_RDONLY)) == -1) {
1125 		warn("can't open %s", sfn);
1126 		goto end;
1127 	}
1128 
1129 	woc_file(tmpfd, *argv, name);
1130 	close(tmpfd);
1131 
1132 end:
1133 	unlink(sfn);
1134 }
1135 
1136 static void
1137 cmd_get(int argc, const char **argv)
1138 {
1139 	struct qid qid;
1140 	const char *l;
1141 	char *errstr;
1142 	int nfid, fd, miss;
1143 
1144 	if (argc != 1 && argc != 2) {
1145 		printf("usage: get remote-file [local-file]\n");
1146 		return;
1147 	}
1148 
1149 	if (argc == 2)
1150 		l = argv[1];
1151 	else if ((l = strrchr(argv[0], '/')) != NULL)
1152 		l++; /* skip / */
1153 	else
1154 		l = argv[0];
1155 
1156 	nfid = nextfid();
1157 	errstr = walk_path(pwdfid, nfid, argv[0], &miss, &qid);
1158 	if (errstr != NULL) {
1159 		printf("%s: %s\n", argv[0], errstr);
1160 		free(errstr);
1161 		return;
1162 	}
1163 
1164 	if (miss != 0 || qid.type != 0) {
1165 		printf("%s: not a file\n", argv[0]);
1166 		if (miss == 0)
1167 			do_clunk(nfid);
1168 		return;
1169 	}
1170 
1171 	if ((fd = open(l, O_WRONLY|O_CREAT|O_TRUNC|O_CLOEXEC, 0644)) == -1) {
1172 		warn("can't open %s", l);
1173 		do_clunk(nfid);
1174 		return;
1175 	}
1176 
1177 	if (fetch_fid(nfid, fd, l) == -1)
1178 		warn("write %s", l);
1179 	close(fd);
1180 }
1181 
1182 static void
1183 cmd_hexdump(int argc, const char **argv)
1184 {
1185 	if (argc == 0) {
1186 		xdump = !xdump;
1187 		if (xdump)
1188 			puts("hexdump mode enabled");
1189 		else
1190 			puts("hexdump mode disabled");
1191 		return;
1192 	}
1193 
1194 	if (argc > 1)
1195 		goto usage;
1196 
1197 	if (!strcmp(*argv, "on")) {
1198 		xdump = 1;
1199 		puts("hexdump mode enabled");
1200 		return;
1201 	}
1202 
1203 	if (!strcmp(*argv, "off")) {
1204 		xdump = 0;
1205 		puts("hexdump mode disabled");
1206 		return;
1207 	}
1208 
1209 usage:
1210 	puts("usage: hexdump [on | off]");
1211 }
1212 
1213 static void
1214 cmd_lcd(int argc, const char **argv)
1215 {
1216 	const char *dir;
1217 
1218 	if (argc > 1) {
1219 		printf("usage: lcd [local-directory]\n");
1220 		return;
1221 	}
1222 
1223 	if (argc == 1)
1224 		dir = *argv;
1225 
1226 	if (argc == 0 && (dir = getenv("HOME")) == NULL) {
1227 		printf("HOME is not defined\n");
1228 		return;
1229 	}
1230 
1231 	if (chdir(dir) == -1)
1232 		printf("cd: %s: %s\n", dir, strerror(errno));
1233 }
1234 
1235 static void
1236 cmd_lpwd(int argc, const char **argv)
1237 {
1238 	char path[PATH_MAX];
1239 
1240 	if (argc != 0) {
1241 		printf("usage: lpwd\n");
1242 		return;
1243 	}
1244 
1245 	if (getcwd(path, sizeof(path)) == NULL) {
1246 		printf("lpwd: %s\n", strerror(errno));
1247 		return;
1248 	}
1249 
1250 	printf("%s\n", path);
1251 }
1252 
1253 static void
1254 cmd_ls(int argc, const char **argv)
1255 {
1256 	struct np_stat st;
1257 	time_t now, mtime;
1258 	struct tm *tm;
1259 	uint64_t off = 0;
1260 	uint32_t len;
1261 	int nfid;
1262 	const char *timfmt;
1263 	char fmt[FMT_SCALED_STRSIZE], tim[13], *errstr;
1264 
1265 	if (argc != 0) {
1266 		printf("ls don't take arguments (yet)\n");
1267 		return;
1268 	}
1269 
1270 	now = time(NULL);
1271 
1272 	nfid = nextfid();
1273 	if ((errstr = dup_fid(pwdfid, nfid)) != NULL) {
1274 		printf(".: %s\n", errstr);
1275 		free(errstr);
1276 		return;
1277 	}
1278 
1279 	do_open(nfid, KOREAD);
1280 
1281 	evbuffer_drain(dirbuf, EVBUFFER_LENGTH(dirbuf));
1282 
1283 	for (;;) {
1284 		tread(nfid, off, BUFSIZ);
1285 		do_send();
1286 		recv_msg();
1287 		expect2(Rread, iota_tag);
1288 
1289 		len = np_read32(buf);
1290 		if (len == 0)
1291 			break;
1292 
1293 		evbuffer_add_buffer(dirbuf, buf);
1294 		off += len;
1295 
1296 		ASSERT_EMPTYBUF();
1297 	}
1298 
1299 	while (EVBUFFER_LENGTH(dirbuf) != 0) {
1300 		if (np_read_stat(dirbuf, &st) == -1)
1301 			errx(1, "invalid stat struct read");
1302 
1303 		if (fmt_scaled(st.length, fmt) == -1)
1304 			strlcpy(fmt, "xxx", sizeof(fmt));
1305 
1306 		mtime = st.mtime;
1307 
1308 		if (now > mtime && (now - mtime) < 365/2 * 24 * 12 * 60)
1309 			timfmt = "%b %e %R";
1310 		else
1311 			timfmt = "%b %e  %Y";
1312 
1313 		if ((tm = localtime(&mtime)) == NULL ||
1314 		    strftime(tim, sizeof(tim), timfmt, tm) == 0)
1315 			strlcpy(tim, "unknown", sizeof(tim));
1316 
1317 		if (st.qid.type & QTDIR)
1318 			printf("d");
1319 		else
1320 			printf("-");
1321 		printf("%s", pp_perm(st.mode >> 6));
1322 		printf("%s", pp_perm(st.mode >> 3));
1323 		printf("%s", pp_perm(st.mode));
1324 		printf(" %8s %12s %s%s\n", fmt, tim, st.name,
1325 		    st.qid.type & QTDIR ? "/" : "");
1326 
1327 		free(st.name);
1328 		free(st.uid);
1329 		free(st.gid);
1330 		free(st.muid);
1331 	}
1332 
1333 	do_clunk(nfid);
1334 }
1335 
1336 static void
1337 cmd_page(int argc, const char **argv)
1338 {
1339 	struct qid qid;
1340 	int nfid, tmpfd, miss, r;
1341 	char sfn[TMPFSTRLEN], p[PATH_MAX], *name, *errstr;
1342 	const char *pager;
1343 
1344 	if (argc != 1) {
1345 		puts("usage: page file");
1346 		return;
1347 	}
1348 
1349 	if ((pager = getenv("PAGER")) == NULL)
1350 		pager = "less";
1351 
1352 	nfid = nextfid();
1353 	errstr = walk_path(pwdfid, nfid, *argv, &miss, &qid);
1354 	if (errstr != NULL) {
1355 		printf("%s: %s\n", *argv, errstr);
1356 		free(errstr);
1357 		return;
1358 	}
1359 
1360 	if (miss != 0 || qid.type != 0) {
1361 		printf("%s: not a file\n", *argv);
1362 		if (miss == 0)
1363 			do_clunk(nfid);
1364 		return;
1365 	}
1366 
1367 	if ((tmpfd = tmp_file(sfn)) == -1) {
1368 		do_clunk(nfid);
1369 		return;
1370 	}
1371 
1372 	strlcpy(p, *argv, sizeof(p));
1373 	name = basename(p);
1374 	if ((r = fetch_fid(nfid, tmpfd, name)) == -1)
1375 		warn("write %s", sfn);
1376 	close(tmpfd);
1377 	if (r != -1)
1378 		spawn(pager, sfn, NULL);
1379 	unlink(sfn);
1380 }
1381 
1382 static void
1383 cmd_pipe(int argc, const char **argv)
1384 {
1385 	struct qid qid;
1386 	pid_t pid;
1387 	int nfid, tmpfd, miss, status;
1388 	int filedes[2]; /* read end, write end */
1389 	char *errstr;
1390 
1391 	if (argc < 2) {
1392 		puts("usage: pipe remote-file cmd [args...]");
1393 		return;
1394 	}
1395 
1396 	nfid = nextfid();
1397 	errstr = walk_path(pwdfid, nfid, *argv, &miss, &qid);
1398 	if (errstr != NULL) {
1399 		printf("%s: %s\n", *argv, errstr);
1400 		free(errstr);
1401 		return;
1402 	}
1403 
1404 	if (miss != 0 || qid.type != 0) {
1405 		printf("%s: not a file\n", *argv);
1406 		if (miss == 0)
1407 			do_clunk(nfid);
1408 		return;
1409 	}
1410 
1411 	if (pipe(filedes) == -1)
1412 		err(1, "pipe");
1413 
1414 	switch (pid = vfork()) {
1415 	case -1:
1416 		err(1, "vfork");
1417 	case 0:
1418 		close(filedes[1]);
1419 		if (dup2(filedes[0], 0) == -1)
1420 			err(1, "dup2");
1421 		execvp(argv[1], (char *const *)argv + 1);
1422 		err(1, "execvp");
1423 	}
1424 
1425 	close(filedes[0]);
1426 	if (fetch_fid(nfid, filedes[1], *argv) == -1)
1427 		warnx("failed to fetch all the file");
1428 	close(filedes[1]);
1429 
1430 	waitpid(pid, &status, 0);
1431 }
1432 
1433 static void
1434 cmd_put(int argc, const char **argv)
1435 {
1436 	struct qid qid;
1437 	const char *l;
1438 	int fd;
1439 
1440 	if (argc != 1 && argc != 2) {
1441 		printf("usage: put local-file [remote-file]\n");
1442 		return;
1443 	}
1444 
1445 	if (argc == 2)
1446 		l = argv[1];
1447 	else if ((l = strrchr(argv[0], '/')) != NULL)
1448 		l++; /* skip / */
1449 	else
1450 		l = argv[0];
1451 
1452 	if ((fd = open(argv[0], O_RDONLY)) == -1) {
1453 		warn("%s", argv[0]);
1454 		return;
1455 	}
1456 
1457 	woc_file(fd, argv[0], l);
1458 	close(fd);
1459 }
1460 
1461 static void
1462 cmd_rename(int argc, const char **argv)
1463 {
1464 	struct np_stat st;
1465 	struct qid qid;
1466 	char *errstr;
1467 	int nfid, miss;
1468 
1469 	if (argc != 2) {
1470 		puts("usage: rename remote-file new-remote-name");
1471 		return;
1472 	}
1473 
1474 	nfid = nextfid();
1475 	errstr = walk_path(pwdfid, nfid, argv[0], &miss, &qid);
1476 	if (errstr != NULL) {
1477 		printf("%s: %s\n", argv[0], errstr);
1478 		free(errstr);
1479 		return;
1480 	}
1481 
1482 	if (miss != 0) {
1483 		printf("%s: not such file or directory\n", argv[0]);
1484 		return;
1485 	}
1486 
1487 	prepare_wstat(&st);
1488 	st.name = (char *)argv[1];
1489 	if ((errstr = do_wstat(nfid, &st)) != NULL) {
1490 		printf("rename: %s\n", errstr);
1491 		free(errstr);
1492 	}
1493 
1494 	do_clunk(nfid);
1495 }
1496 
1497 static void
1498 cmd_verbose(int argc, const char **argv)
1499 {
1500 	if (argc == 0) {
1501 		log_setverbose(!log_getverbose());
1502 		if (log_getverbose())
1503 			puts("verbose mode enabled");
1504 		else
1505 			puts("verbose mode disabled");
1506 		return;
1507 	}
1508 
1509 	if (argc != 1)
1510 		goto usage;
1511 
1512 	if (!strcmp(*argv, "on")) {
1513 		log_setverbose(1);
1514 		puts("verbose mode enabled");
1515 		return;
1516 	}
1517 
1518 	if (!strcmp(*argv, "off")) {
1519 		log_setverbose(0);
1520 		puts("verbose mode disabled");
1521 		return;
1522 	}
1523 
1524 usage:
1525 	printf("verbose [on | off]\n");
1526 }
1527 
1528 static void
1529 excmd(int argc, const char **argv)
1530 {
1531 	struct cmd {
1532 		const char	*name;
1533 		void		(*fn)(int, const char **);
1534 	} cmds[] = {
1535 		{"bell",	cmd_bell},
1536 		{"bye",		cmd_bye},
1537 		{"cd",		cmd_cd},
1538 		{"edit",	cmd_edit},
1539 		{"get",		cmd_get},
1540 		{"hexdump",	cmd_hexdump},
1541 		{"lcd",		cmd_lcd},
1542 		{"lpwd",	cmd_lpwd},
1543 		{"ls",		cmd_ls},
1544 		{"page",	cmd_page},
1545 		{"pipe",	cmd_pipe},
1546 		{"put",		cmd_put},
1547 		{"quit",	cmd_bye},
1548 		{"rename",	cmd_rename},
1549 		{"verbose",	cmd_verbose},
1550 	};
1551 	size_t i;
1552 
1553 	if (argc == 0)
1554 		return;
1555 	for (i = 0; i < nitems(cmds); ++i) {
1556 		if (!strcmp(cmds[i].name, *argv)) {
1557 			cmds[i].fn(argc-1, argv+1);
1558 			return;
1559 		}
1560 	}
1561 
1562 	log_warnx("unknown command %s", *argv);
1563 }
1564 
1565 int
1566 main(int argc, char **argv)
1567 {
1568 	int	ch;
1569 
1570 	log_init(1, LOG_DAEMON);
1571 	log_setverbose(0);
1572 	log_procinit(getprogname());
1573 
1574 	while ((ch = getopt(argc, argv, "C:cK:")) != -1) {
1575 		switch (ch) {
1576 		case 'C':
1577 			crtpath = optarg;
1578 			break;
1579 		case 'c':
1580 			tls = 1;
1581 			break;
1582 		case 'K':
1583 			keypath = optarg;
1584 			break;
1585 		default:
1586 			usage(1);
1587 		}
1588 	}
1589 	argc -= optind;
1590 	argv += optind;
1591 
1592 	if (argc == 0)
1593 		usage(1);
1594 
1595 	signal(SIGPIPE, SIG_IGN);
1596 	if (isatty(1)) {
1597 		tty_p = 1;
1598 		resized = 1;
1599 		signal(SIGWINCH, tty_resized);
1600 	}
1601 
1602 	if ((evb = evbuffer_new()) == NULL)
1603 		fatal("evbuffer_new");
1604 
1605 	if ((buf = evbuffer_new()) == NULL)
1606 		fatal("evbuffer_new");
1607 
1608 	if ((dirbuf = evbuffer_new()) == NULL)
1609 		fatal("evbuferr_new");
1610 
1611 	do_connect(argv[0], argv[1]);
1612 
1613 	for (;;) {
1614 		int argc = 0;
1615 		char *line, *argv[16] = {0}, **ap;
1616 
1617 		if ((line = read_line("kamiftp> ")) == NULL)
1618 			break;
1619 
1620 		for (argc = 0, ap = argv; ap < &argv[15] &&
1621 		    (*ap = strsep(&line, " \t")) != NULL;) {
1622 			if (**ap != '\0')
1623 				ap++, argc++;
1624 		}
1625 		excmd(argc, (const char **)argv);
1626 
1627 		if (bell) {
1628 			printf("\a");
1629 			fflush(stdout);
1630 		}
1631 
1632 		free(line);
1633 	}
1634 
1635 	printf("\n");
1636 }