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Date:: Tue Mar 24 14:08:03 2020 UTC
Message:: represent packfile hash as byte array in the privsep layer, not as object ID
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1 /*
2  * Copyright (c) 2019 Ori Bernstein <ori@openbsd.org>
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 <sys/types.h>
18 #include <sys/queue.h>
19 #include <sys/uio.h>
20 #include <sys/time.h>
21 #include <sys/stat.h>
22 #include <sys/syslimits.h>
23 
24 #include <stdint.h>
25 #include <errno.h>
26 #include <imsg.h>
27 #include <limits.h>
28 #include <signal.h>
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <string.h>
32 #include <ctype.h>
33 #include <sha1.h>
34 #include <fcntl.h>
35 #include <zlib.h>
36 #include <err.h>
37 
38 #include "got_error.h"
39 #include "got_object.h"
40 #include "got_path.h"
41 #include "got_version.h"
42 #include "got_fetch.h"
43 #include "got_reference.h"
44 
45 #include "got_lib_sha1.h"
46 #include "got_lib_delta.h"
47 #include "got_lib_object.h"
48 #include "got_lib_object_parse.h"
49 #include "got_lib_privsep.h"
50 #include "got_lib_pack.h"
51 
52 #ifndef nitems
53 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
54 #endif
55 
56 struct got_object *indexed;
57 static int chattygot;
58 static struct got_object_id zhash = {.sha1={0}};
59 
60 static const struct got_error *
61 readn(ssize_t *off, int fd, void *buf, size_t n)
62 {
63 	ssize_t r;
64 
65 	*off = 0;
66 	while (*off != n) {
67 		r = read(fd, buf + *off, n - *off);
68 		if (r == -1)
69 			return got_error_from_errno("read");
70 		if (r == 0)
71 			return NULL;
72 		*off += r;
73 	}
74 	return NULL;
75 }
76 
77 static const struct got_error *
78 flushpkt(int fd)
79 {
80 	ssize_t w;
81 
82 	if (chattygot > 1)
83 		fprintf(stderr, "%s: writepkt: 0000\n", getprogname());
84 
85 	 w = write(fd, "0000", 4);
86 	 if (w == -1)
87 		return got_error_from_errno("write");
88 	if (w != 4)
89 		return got_error(GOT_ERR_IO);
90 	return NULL;
91 }
92 
93 /*
94  * Packet header contains a 4-byte hexstring which specifies the length
95  * of data which follows.
96  */
97 static const struct got_error *
98 read_pkthdr(int *datalen, int fd)
99 {
100 	static const struct got_error *err = NULL;
101 	char lenstr[5];
102 	long len;
103 	char *e;
104 	int n, i;
105 	ssize_t r;
106 
107 	*datalen = 0;
108 
109 	err = readn(&r, fd, lenstr, 4);
110 	if (err)
111 		return err;
112 	if (r == 0) {
113 		/* implicit "0000" */
114 		if (chattygot > 1)
115 			fprintf(stderr, "%s: readpkt: 0000\n", getprogname());
116 		return NULL;
117 	}
118 	if (r != 4)
119 		return got_error_msg(GOT_ERR_BAD_PACKET,
120 		    "wrong packet header length");
121 
122 	lenstr[4] = '\0';
123 	for (i = 0; i < 4; i++) {
124 		if (!isprint((unsigned char)lenstr[i]))
125 			return got_error_msg(GOT_ERR_BAD_PACKET,
126 			    "unprintable character in packet length field");
127 	}
128 	for (i = 0; i < 4; i++) {
129 		if (!isxdigit((unsigned char)lenstr[i])) {
130 			if (chattygot)
131 				fprintf(stderr, "%s: bad length: '%s'\n",
132 				    getprogname(), lenstr);
133 			return got_error_msg(GOT_ERR_BAD_PACKET,
134 			    "packet length not specified in hex");
135 		}
136 	}
137 	errno = 0;
138 	len = strtol(lenstr, &e, 16);
139 	if (lenstr[0] == '\0' || *e != '\0')
140 		return got_error(GOT_ERR_BAD_PACKET);
141 	if (errno == ERANGE && (len == LONG_MAX || len == LONG_MIN))
142 		return got_error_msg(GOT_ERR_BAD_PACKET, "bad packet length");
143 	if (len > INT_MAX || len < INT_MIN)
144 		return got_error_msg(GOT_ERR_BAD_PACKET, "bad packet length");
145 	n = len;
146 	if (n == 0)
147 		return NULL;
148 	if (n <= 4)
149 		return got_error_msg(GOT_ERR_BAD_PACKET, "packet too short");
150 	n  -= 4;
151 
152 	*datalen = n;
153 	return NULL;
154 }
155 
156 static const struct got_error *
157 readpkt(int *outlen, int fd, char *buf, int buflen)
158 {
159 	const struct got_error *err = NULL;
160 	int datalen, i;
161 	ssize_t n;
162 
163 	err = read_pkthdr(&datalen, fd);
164 	if (err)
165 		return err;
166 
167 	if (datalen > buflen)
168 		return got_error(GOT_ERR_NO_SPACE);
169 
170 	err = readn(&n, fd, buf, datalen);
171 	if (err)
172 		return err;
173 	if (n != datalen)
174 		return got_error_msg(GOT_ERR_BAD_PACKET, "short packet");
175 
176 	if (chattygot > 1) {
177 		fprintf(stderr, "%s: readpkt: %zd:\t", getprogname(), n);
178 		for (i = 0; i < n; i++) {
179 			if (isprint(buf[i]))
180 				fputc(buf[i], stderr);
181 			else
182 				fprintf(stderr, "[0x%.2x]", buf[i]);
183 		}
184 		fputc('\n', stderr);
185 	}
186 
187 	*outlen = n;
188 	return NULL;
189 }
190 
191 static const struct got_error *
192 writepkt(int fd, char *buf, int nbuf)
193 {
194 	char len[5];
195 	int i;
196 	ssize_t w;
197 
198 	if (snprintf(len, sizeof(len), "%04x", nbuf + 4) >= sizeof(len))
199 		return got_error(GOT_ERR_NO_SPACE);
200 	w = write(fd, len, 4);
201 	if (w == -1)
202 		return got_error_from_errno("write");
203 	if (w != 4)
204 		return got_error(GOT_ERR_IO);
205 	w = write(fd, buf, nbuf);
206 	if (w == -1)
207 		return got_error_from_errno("write");
208 	if (w != nbuf)
209 		return got_error(GOT_ERR_IO);
210 	if (chattygot > 1) {
211 		fprintf(stderr, "%s: writepkt: %s:\t", getprogname(), len);
212 		for (i = 0; i < nbuf; i++) {
213 			if (isprint(buf[i]))
214 				fputc(buf[i], stderr);
215 			else
216 				fprintf(stderr, "[0x%.2x]", buf[i]);
217 		}
218 		fputc('\n', stderr);
219 	}
220 	return NULL;
221 }
222 
223 static void
224 match_remote_ref(struct got_pathlist_head *have_refs,
225     struct got_object_id *my_id, char *refname)
226 {
227 	struct got_pathlist_entry *pe;
228 
229 	/* XXX zero-hash signifies we don't have this ref;
230 	 * we should use a flag instead */
231 	memset(my_id, 0, sizeof(*my_id));
232 
233 	TAILQ_FOREACH(pe, have_refs, entry) {
234 		struct got_object_id *id = pe->data;
235 		if (strcmp(pe->path, refname) == 0) { 
236 			memcpy(my_id, id, sizeof(*my_id));
237 			break;
238 		}
239 	}
240 }
241 
242 static int
243 match_branch(const char *branch, const char *wanted_branch)
244 {
245 	if (strncmp(branch, "refs/heads/", 11) != 0)
246 		return 0;
247 
248 	if (strncmp(wanted_branch, "refs/heads/", 11) == 0)
249 		wanted_branch += 11;
250 
251 	return (strcmp(branch + 11, wanted_branch) == 0);
252 }
253 
254 static int
255 match_wanted_ref(const char *refname, const char *wanted_ref)
256 {
257 	if (strncmp(refname, "refs/", 5) != 0)
258 		return 0;
259 	refname += 5;
260 
261 	/*
262 	 * Prevent fetching of references that won't make any
263 	 * sense outside of the remote repository's context.
264 	 */
265 	if (strncmp(refname, "got/", 4) == 0)
266 		return 0;
267 	if (strncmp(refname, "remotes/", 8) == 0)
268 		return 0;
269 
270 	if (strncmp(wanted_ref, "refs/", 5) == 0)
271 		wanted_ref += 5;
272 
273 	/* Allow prefix match. */
274 	if (got_path_is_child(refname, wanted_ref, strlen(wanted_ref)))
275 		return 1;
276 
277 	/* Allow exact match. */
278 	return (strcmp(refname, wanted_ref) == 0);
279 }
280 
281 static const struct got_error *
282 tokenize_refline(char **tokens, char *line, int len, int maxtokens)
283 {
284 	const struct got_error *err = NULL;
285 	char *p;
286 	size_t i, n = 0;
287 
288 	for (i = 0; i < maxtokens; i++)
289 		tokens[i] = NULL;
290 
291 	for (i = 0; n < len && i < maxtokens; i++) {
292 		while (isspace(*line)) {
293 			line++;
294 			n++;
295 		}
296 		p = line;
297 		while (*line != '\0' &&
298 		    (!isspace(*line) || i == maxtokens - 1)) {
299 			line++;
300 			n++;
301 		}
302 		tokens[i] = strndup(p, line - p);
303 		if (tokens[i] == NULL) {
304 			err = got_error_from_errno("strndup");
305 			goto done;
306 		}
307 		/* Skip \0 field-delimiter at end of token. */
308 		while (line[0] == '\0' && n < len) {
309 			line++;
310 			n++;
311 		}
312 	}
313 	if (i <= 2)
314 		err = got_error(GOT_ERR_NOT_REF);
315 done:
316 	if (err) {
317 		int j;
318 		for (j = 0; j < i; j++)
319 			free(tokens[j]);
320 			tokens[j] = NULL;
321 	}
322 	return err;
323 }
324 
325 static const struct got_error *
326 parse_refline(char **id_str, char **refname, char **server_capabilities,
327     char *line, int len)
328 {
329 	const struct got_error *err = NULL;
330 	char *tokens[3];
331 
332 	err = tokenize_refline(tokens, line, len, nitems(tokens));
333 	if (err)
334 		return err;
335 
336 	if (tokens[0])
337 		*id_str = tokens[0];
338 	if (tokens[1])
339 		*refname = tokens[1];
340 	if (tokens[2]) {
341 		char *p;
342 		*server_capabilities = tokens[2];
343 		p = strrchr(*server_capabilities, '\n');
344 		if (p)
345 			*p = '\0';
346 	}
347 	
348 	return NULL;
349 }
350 
351 #define GOT_CAPA_AGENT			"agent"
352 #define GOT_CAPA_OFS_DELTA		"ofs-delta"
353 #define GOT_CAPA_SIDE_BAND_64K		"side-band-64k"
354 
355 #define GOT_SIDEBAND_PACKFILE_DATA	1
356 #define GOT_SIDEBAND_PROGRESS_INFO	2
357 #define GOT_SIDEBAND_ERROR_INFO		3
358 
359 
360 struct got_capability {
361 	const char *key;
362 	const char *value;
363 };
364 static const struct got_capability got_capabilities[] = {
365 	{ GOT_CAPA_AGENT, "got/" GOT_VERSION_STR },
366 	{ GOT_CAPA_OFS_DELTA, NULL },
367 	{ GOT_CAPA_SIDE_BAND_64K, NULL },
368 };
369 
370 static const struct got_error *
371 match_capability(char **my_capabilities, const char *capa,
372     const struct got_capability *mycapa)
373 {
374 	char *equalsign;
375 	char *s;
376 
377 	equalsign = strchr(capa, '=');
378 	if (equalsign) {
379 		if (strncmp(capa, mycapa->key, equalsign - capa) != 0)
380 			return NULL;
381 	} else {
382 		if (strcmp(capa, mycapa->key) != 0)
383 			return NULL;
384 	}
385 
386 	if (asprintf(&s, "%s %s%s%s",
387 	    *my_capabilities != NULL ? *my_capabilities : "",
388 	    mycapa->key,
389 	    mycapa->value != NULL ? "=" : "",
390 	    mycapa->value != NULL? mycapa->value : "") == -1)
391 		return got_error_from_errno("asprintf");
392 
393 	free(*my_capabilities);
394 	*my_capabilities = s;
395 	return NULL;
396 }
397 
398 static const struct got_error *
399 add_symref(struct got_pathlist_head *symrefs, char *capa)
400 {
401 	const struct got_error *err = NULL;
402 	char *colon, *name = NULL, *target = NULL;
403 
404 	/* Need at least "A:B" */
405 	if (strlen(capa) < 3)
406 		return NULL;
407 
408 	colon = strchr(capa, ':');
409 	if (colon == NULL)
410 		return NULL;
411 
412 	*colon = '\0';
413 	name = strdup(capa);
414 	if (name == NULL)
415 		return got_error_from_errno("strdup");
416 
417 	target = strdup(colon + 1);
418 	if (target == NULL) {
419 		err = got_error_from_errno("strdup");
420 		goto done;
421 	}
422 
423 	/* We can't validate the ref itself here. The main process will. */
424 	err = got_pathlist_append(symrefs, name, target);
425 done:
426 	if (err) {
427 		free(name);
428 		free(target);
429 	}
430 	return err;
431 }
432 
433 static const struct got_error *
434 match_capabilities(char **my_capabilities, struct got_pathlist_head *symrefs,
435     char *server_capabilities)
436 {
437 	const struct got_error *err = NULL;
438 	char *capa, *equalsign;
439 	int i;
440 
441 	*my_capabilities = NULL;
442 	do {
443 		capa = strsep(&server_capabilities, " ");
444 		if (capa == NULL)
445 			return NULL;
446 
447 		equalsign = strchr(capa, '=');
448 		if (equalsign != NULL &&
449 		    strncmp(capa, "symref", equalsign - capa) == 0) {
450 			err = add_symref(symrefs, equalsign + 1);
451 			if (err)
452 				break;
453 			continue;
454 		}
455 
456 		for (i = 0; i < nitems(got_capabilities); i++) {
457 			err = match_capability(my_capabilities,
458 			    capa, &got_capabilities[i]);
459 			if (err)
460 				break;
461 		}
462 	} while (capa);
463 
464 	if (*my_capabilities == NULL) {
465 		*my_capabilities = strdup("");
466 		if (*my_capabilities == NULL)
467 			err = got_error_from_errno("strdup");
468 	}
469 	return err;
470 }
471 
472 static const struct got_error *
473 send_fetch_server_progress(struct imsgbuf *ibuf, const char *msg, size_t msglen)
474 {
475 	if (msglen > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
476 		return got_error(GOT_ERR_NO_SPACE);
477 
478 	if (msglen == 0)
479 		return NULL;
480 
481 	if (imsg_compose(ibuf, GOT_IMSG_FETCH_SERVER_PROGRESS, 0, 0, -1,
482 	    msg, msglen) == -1)
483 		return got_error_from_errno(
484 		    "imsg_compose FETCH_SERVER_PROGRESS");
485 
486 	return got_privsep_flush_imsg(ibuf);
487 }
488 
489 static const struct got_error *
490 send_fetch_download_progress(struct imsgbuf *ibuf, off_t bytes)
491 {
492 	if (imsg_compose(ibuf, GOT_IMSG_FETCH_DOWNLOAD_PROGRESS, 0, 0, -1,
493 	    &bytes, sizeof(bytes)) == -1)
494 		return got_error_from_errno(
495 		    "imsg_compose FETCH_DOWNLOAD_PROGRESS");
496 
497 	return got_privsep_flush_imsg(ibuf);
498 }
499 
500 static const struct got_error *
501 send_fetch_done(struct imsgbuf *ibuf, uint8_t *pack_sha1)
502 {
503 	if (imsg_compose(ibuf, GOT_IMSG_FETCH_DONE, 0, 0, -1,
504 	    pack_sha1, SHA1_DIGEST_LENGTH) == -1)
505 		return got_error_from_errno("imsg_compose FETCH");
506 	return got_privsep_flush_imsg(ibuf);
507 }
508 
509 
510 
511 static const struct got_error *
512 fetch_progress(struct imsgbuf *ibuf, const char *buf, size_t len)
513 {
514 	int i;
515 
516 	if (len == 0)
517 		return NULL;
518 
519 	/*
520 	 * Truncate messages which exceed the maximum imsg payload size.
521 	 * Server may send up to 64k.
522 	 */
523 	if (len > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
524 		len = MAX_IMSGSIZE - IMSG_HEADER_SIZE;
525 
526 	/* Only allow printable ASCII. */
527 	for (i = 0; i < len; i++) {
528 		if (isprint((unsigned char)buf[i]) ||
529 		    isspace((unsigned char)buf[i]))
530 			continue;
531 		return got_error_msg(GOT_ERR_BAD_PACKET,
532 		    "non-printable progress message received from server");
533 	}
534 
535 	return send_fetch_server_progress(ibuf, buf, len);
536 }
537 
538 static const struct got_error *
539 fetch_error(const char *buf, size_t len)
540 {
541 	static char msg[1024];
542 	int i;
543 
544 	for (i = 0; i < len && i < sizeof(msg) - 1; i++) {
545 		if (!isprint(buf[i]))
546 			return got_error_msg(GOT_ERR_BAD_PACKET,
547 			    "non-printable error message received from server");
548 		msg[i] = buf[i];
549 	}
550 	msg[i] = '\0';
551 	return got_error_msg(GOT_ERR_FETCH_FAILED, msg);
552 }
553 
554 static const struct got_error *
555 send_fetch_symrefs(struct imsgbuf *ibuf, struct got_pathlist_head *symrefs)
556 {
557 	const struct got_error *err = NULL;
558 	struct ibuf *wbuf;
559 	size_t len, nsymrefs = 0;
560 	struct got_pathlist_entry *pe;
561 
562 	len = sizeof(struct got_imsg_fetch_symrefs);
563 	TAILQ_FOREACH(pe, symrefs, entry) {
564 		const char *target = pe->data;
565 		len += sizeof(struct got_imsg_fetch_symref) +
566 		    pe->path_len + strlen(target);
567 		nsymrefs++;
568 	}
569 
570 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE)
571 		return got_error(GOT_ERR_NO_SPACE);
572 
573 	wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_SYMREFS, 0, 0, len);
574 	if (wbuf == NULL)
575 		return got_error_from_errno("imsg_create FETCH_SYMREFS");
576 
577 	/* Keep in sync with struct got_imsg_fetch_symrefs definition! */
578 	if (imsg_add(wbuf, &nsymrefs, sizeof(nsymrefs)) == -1) {
579 		err = got_error_from_errno("imsg_add FETCH_SYMREFS");
580 		ibuf_free(wbuf);
581 		return err;
582 	}
583 
584 	TAILQ_FOREACH(pe, symrefs, entry) {
585 		const char *name = pe->path;
586 		size_t name_len = pe->path_len;
587 		const char *target = pe->data;
588 		size_t target_len = strlen(target);
589 
590 		/* Keep in sync with struct got_imsg_fetch_symref definition! */
591 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1) {
592 			err = got_error_from_errno("imsg_add FETCH_SYMREFS");
593 			ibuf_free(wbuf);
594 			return err;
595 		}
596 		if (imsg_add(wbuf, &target_len, sizeof(target_len)) == -1) {
597 			err = got_error_from_errno("imsg_add FETCH_SYMREFS");
598 			ibuf_free(wbuf);
599 			return err;
600 		}
601 		if (imsg_add(wbuf, name, name_len) == -1) {
602 			err = got_error_from_errno("imsg_add FETCH_SYMREFS");
603 			ibuf_free(wbuf);
604 			return err;
605 		}
606 		if (imsg_add(wbuf, target, target_len) == -1) {
607 			err = got_error_from_errno("imsg_add FETCH_SYMREFS");
608 			ibuf_free(wbuf);
609 			return err;
610 		}
611 	}
612 
613 	wbuf->fd = -1;
614 	imsg_close(ibuf, wbuf);
615 	return got_privsep_flush_imsg(ibuf);
616 }
617 
618 static const struct got_error *
619 send_fetch_ref(struct imsgbuf *ibuf, struct got_object_id *refid,
620     const char *refname)
621 {
622 	const struct got_error *err = NULL;
623 	struct ibuf *wbuf;
624 	size_t len, reflen = strlen(refname);
625 
626 	len = sizeof(struct got_imsg_fetch_ref) + reflen;
627 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE)
628 		return got_error(GOT_ERR_NO_SPACE);
629 
630 	wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_REF, 0, 0, len);
631 	if (wbuf == NULL)
632 		return got_error_from_errno("imsg_create FETCH_REF");
633 
634 	/* Keep in sync with struct got_imsg_fetch_ref definition! */
635 	if (imsg_add(wbuf, refid->sha1, SHA1_DIGEST_LENGTH) == -1) {
636 		err = got_error_from_errno("imsg_add FETCH_REF");
637 		ibuf_free(wbuf);
638 		return err;
639 	}
640 	if (imsg_add(wbuf, refname, reflen) == -1) {
641 		err = got_error_from_errno("imsg_add FETCH_REF");
642 		ibuf_free(wbuf);
643 		return err;
644 	}
645 
646 	wbuf->fd = -1;
647 	imsg_close(ibuf, wbuf);
648 	return got_privsep_flush_imsg(ibuf);
649 }
650 
651 static const struct got_error *
652 fetch_pack(int fd, int packfd, uint8_t *pack_sha1,
653     struct got_pathlist_head *have_refs, int fetch_all_branches,
654     struct got_pathlist_head *wanted_branches,
655     struct got_pathlist_head *wanted_refs, int list_refs_only,
656     struct imsgbuf *ibuf)
657 {
658 	const struct got_error *err = NULL;
659 	char buf[GOT_FETCH_PKTMAX];
660 	char hashstr[SHA1_DIGEST_STRING_LENGTH];
661 	struct got_object_id *have, *want;
662 	int is_firstpkt = 1, nref = 0, refsz = 16;
663 	int i, n, nwant = 0, nhave = 0, acked = 0;
664 	off_t packsz = 0, last_reported_packsz = 0;
665 	char *id_str = NULL, *refname = NULL;
666 	char *server_capabilities = NULL, *my_capabilities = NULL;
667 	const char *default_branch = NULL;
668 	struct got_pathlist_head symrefs;
669 	struct got_pathlist_entry *pe;
670 	int sent_my_capabilites = 0, have_sidebands = 0;
671 	int found_branch = 0;
672 	SHA1_CTX sha1_ctx;
673 	uint8_t sha1_buf[SHA1_DIGEST_LENGTH];
674 	size_t sha1_buf_len = 0;
675 	ssize_t w;
676 
677 	TAILQ_INIT(&symrefs);
678 	SHA1Init(&sha1_ctx);
679 
680 	have = malloc(refsz * sizeof(have[0]));
681 	if (have == NULL)
682 		return got_error_from_errno("malloc");
683 	want = malloc(refsz * sizeof(want[0]));
684 	if (want == NULL) {
685 		err = got_error_from_errno("malloc");
686 		goto done;
687 	}
688 	while (1) {
689 		err = readpkt(&n, fd, buf, sizeof(buf));
690 		if (err)
691 			goto done;
692 		if (n == 0)
693 			break;
694 		if (n >= 4 && strncmp(buf, "ERR ", 4) == 0) {
695 			err = fetch_error(&buf[4], n - 4);
696 			goto done;
697 		}
698 		err = parse_refline(&id_str, &refname, &server_capabilities,
699 		    buf, n);
700 		if (err)
701 			goto done;
702 		if (is_firstpkt) {
703 			if (chattygot && server_capabilities[0] != '\0')
704 				fprintf(stderr, "%s: server capabilities: %s\n",
705 				    getprogname(), server_capabilities);
706 			err = match_capabilities(&my_capabilities, &symrefs,
707 			    server_capabilities);
708 			if (err)
709 				goto done;
710 			if (chattygot)
711 				fprintf(stderr, "%s: my capabilities:%s\n",
712 				    getprogname(), my_capabilities);
713 			err = send_fetch_symrefs(ibuf, &symrefs);
714 			if (err)
715 				goto done;
716 			is_firstpkt = 0;
717 			if (!fetch_all_branches) {
718 				TAILQ_FOREACH(pe, &symrefs, entry) {
719 					const char *name = pe->path;
720 					const char *symref_target = pe->data;
721 					if (strcmp(name, GOT_REF_HEAD) != 0)
722 						continue;
723 					default_branch = symref_target;
724 					break;
725 				}
726 			}
727 			continue;
728 		}
729 		if (strstr(refname, "^{}")) {
730 			if (chattygot) {
731 				fprintf(stderr, "%s: ignoring %s\n",
732 				    getprogname(), refname);
733 			}
734 			continue;
735 		}
736 
737 		if (strncmp(refname, "refs/heads/", 11) == 0) {
738 			if (fetch_all_branches || list_refs_only) {
739 				found_branch = 1;
740 			} else if (!TAILQ_EMPTY(wanted_branches)) {
741 				TAILQ_FOREACH(pe, wanted_branches, entry) {
742 					if (match_branch(refname, pe->path))
743 						break;
744 				}
745 				if (pe == NULL) {
746 					if (chattygot) {
747 						fprintf(stderr,
748 						    "%s: ignoring %s\n",
749 						    getprogname(), refname);
750 					}
751 					continue;
752 				}
753 				found_branch = 1;
754 			} else if (default_branch != NULL) {
755 				if (!match_branch(refname, default_branch)) {
756 					if (chattygot) {
757 						fprintf(stderr,
758 						    "%s: ignoring %s\n",
759 						    getprogname(), refname);
760 					}
761 					continue;
762 				}
763 				found_branch = 1;
764 			}
765 		} else if (strncmp(refname, "refs/tags/", 10) != 0) {
766 			if (!TAILQ_EMPTY(wanted_refs)) {
767 				TAILQ_FOREACH(pe, wanted_refs, entry) {
768 					if (match_wanted_ref(refname, pe->path))
769 						break;
770 				}
771 				if (pe == NULL) {
772 					if (chattygot) {
773 						fprintf(stderr,
774 						    "%s: ignoring %s\n",
775 						    getprogname(), refname);
776 					}
777 					continue;
778 				}
779 				found_branch = 1;
780 			} else if (!list_refs_only) {
781 				if (chattygot) {
782 					fprintf(stderr, "%s: ignoring %s\n",
783 					    getprogname(), refname);
784 				}
785 				continue;
786 			}
787 		}
788 
789 		if (refsz == nref + 1) {
790 			refsz *= 2;
791 			have = reallocarray(have, refsz, sizeof(have[0]));
792 			if (have == NULL) {
793 				err = got_error_from_errno("reallocarray");
794 				goto done;
795 			}
796 			want = reallocarray(want, refsz, sizeof(want[0]));
797 			if (want == NULL) {
798 				err = got_error_from_errno("reallocarray");
799 				goto done;
800 			}
801 		}
802 		if (!got_parse_sha1_digest(want[nref].sha1, id_str)) {
803 			err = got_error(GOT_ERR_BAD_OBJ_ID_STR);
804 			goto done;
805 		}
806 		match_remote_ref(have_refs, &have[nref], refname);
807 		err = send_fetch_ref(ibuf, &want[nref], refname);
808 		if (err)
809 			goto done;
810 
811 		if (chattygot)
812 			fprintf(stderr, "%s: %s will be fetched\n",
813 			    getprogname(), refname);
814 		if (chattygot > 1) {
815 			char *theirs, *mine;
816 			err = got_object_id_str(&theirs, &want[nref]);
817 			if (err)
818 				goto done;
819 			err = got_object_id_str(&mine, &have[nref]);
820 			if (err) {
821 				free(theirs);
822 				goto done;
823 			}
824 			fprintf(stderr, "%s: remote: %s\n%s: local:  %s\n",
825 			    getprogname(), theirs, getprogname(), mine);
826 			free(theirs);
827 			free(mine);
828 		}
829 		nref++;
830 	}
831 
832 	if (list_refs_only)
833 		goto done;
834 
835 	/* Abort if we haven't found any branch to fetch. */
836 	if (!found_branch) {
837 		err = got_error(GOT_ERR_FETCH_NO_BRANCH);
838 		goto done;
839 	}
840 
841 	for (i = 0; i < nref; i++) {
842 		if (got_object_id_cmp(&have[i], &want[i]) == 0)
843 			continue;
844 		got_sha1_digest_to_str(want[i].sha1, hashstr, sizeof(hashstr));
845 		n = snprintf(buf, sizeof(buf), "want %s%s\n", hashstr,
846 		   sent_my_capabilites ? "" : my_capabilities);
847 		if (n >= sizeof(buf)) {
848 			err = got_error(GOT_ERR_NO_SPACE);
849 			goto done;
850 		}
851 		err = writepkt(fd, buf, n);
852 		if (err)
853 			goto done;
854 		sent_my_capabilites = 1;
855 		nwant++;
856 	}
857 	err = flushpkt(fd);
858 	if (err)
859 		goto done;
860 
861 	if (nwant == 0)
862 		goto done;
863 
864 	for (i = 0; i < nref; i++) {
865 		if (got_object_id_cmp(&have[i], &zhash) == 0)
866 			continue;
867 		got_sha1_digest_to_str(have[i].sha1, hashstr, sizeof(hashstr));
868 		n = snprintf(buf, sizeof(buf), "have %s\n", hashstr);
869 		if (n >= sizeof(buf)) {
870 			err = got_error(GOT_ERR_NO_SPACE);
871 			goto done;
872 		}
873 		err = writepkt(fd, buf, n);
874 		if (err)
875 			goto done;
876 		nhave++;
877 	}
878 
879 	while (nhave > 0 && !acked) {
880 		struct got_object_id common_id;
881 
882 		/* The server should ACK the object IDs we need. */
883 		err = readpkt(&n, fd, buf, sizeof(buf));
884 		if (err)
885 			goto done;
886 		if (n >= 4 && strncmp(buf, "ERR ", 4) == 0) {
887 			err = fetch_error(&buf[4], n - 4);
888 			goto done;
889 		}
890 		if (n >= 4 && strncmp(buf, "NAK\n", 4) == 0) {
891 			/* Server has not located our objects yet. */
892 			continue;
893 		}
894 		if (n < 4 + SHA1_DIGEST_STRING_LENGTH ||
895 		    strncmp(buf, "ACK ", 4) != 0) {
896 			err = got_error_msg(GOT_ERR_BAD_PACKET,
897 			    "unexpected message from server");
898 			goto done;
899 		}
900 		if (!got_parse_sha1_digest(common_id.sha1, buf + 4)) {
901 			err = got_error_msg(GOT_ERR_BAD_PACKET,
902 			    "bad object ID in ACK packet from server");
903 			goto done;
904 		}
905 		acked++;
906 	}
907 
908 	n = snprintf(buf, sizeof(buf), "done\n");
909 	err = writepkt(fd, buf, n);
910 	if (err)
911 		goto done;
912 
913 	if (nhave == 0) {
914 		err = readpkt(&n, fd, buf, sizeof(buf));
915 		if (err)
916 			goto done;
917 		if (n != 4 || strncmp(buf, "NAK\n", n) != 0) {
918 			err = got_error_msg(GOT_ERR_BAD_PACKET,
919 			    "unexpected message from server");
920 			goto done;
921 		}
922 	}
923 
924 	if (chattygot)
925 		fprintf(stderr, "%s: fetching...\n", getprogname());
926 
927 	if (my_capabilities != NULL &&
928 	    strstr(my_capabilities, GOT_CAPA_SIDE_BAND_64K) != NULL)
929 		have_sidebands = 1;
930 
931 	while (1) {
932 		ssize_t r = 0;
933 		int datalen = -1;
934 
935 		if (have_sidebands) {
936 			err = read_pkthdr(&datalen, fd);
937 			if (err)
938 				goto done;
939 			if (datalen <= 0)
940 				break;
941 
942 			/* Read sideband channel ID (one byte). */
943 			r = read(fd, buf, 1);
944 			if (r == -1) {
945 				err = got_error_from_errno("read");
946 				goto done;
947 			}
948 			if (r != 1) {
949 				err = got_error_msg(GOT_ERR_BAD_PACKET,
950 				    "short packet");
951 				goto done;
952 			}
953 			if (datalen > sizeof(buf) - 5) {
954 				err = got_error_msg(GOT_ERR_BAD_PACKET,
955 				    "bad packet length");
956 				goto done;
957 			}
958 			datalen--; /* sideband ID has been read */
959 			if (buf[0] == GOT_SIDEBAND_PACKFILE_DATA) {
960 				/* Read packfile data. */
961 				err = readn(&r, fd, buf, datalen);
962 				if (err)
963 					goto done;
964 				if (r != datalen) {
965 					err = got_error_msg(GOT_ERR_BAD_PACKET,
966 					    "packet too short");
967 					goto done;
968 				}
969 			} else if (buf[0] == GOT_SIDEBAND_PROGRESS_INFO) {
970 				err = readn(&r, fd, buf, datalen);
971 				if (err)
972 					goto done;
973 				if (r != datalen) {
974 					err = got_error_msg(GOT_ERR_BAD_PACKET,
975 					    "packet too short");
976 					goto done;
977 				}
978 				err = fetch_progress(ibuf, buf, r);
979 				if (err)
980 					goto done;
981 				continue;
982 			} else if (buf[0] == GOT_SIDEBAND_ERROR_INFO) {
983 				err = readn(&r, fd, buf, datalen);
984 				if (err)
985 					goto done;
986 				if (r != datalen) {
987 					err = got_error_msg(GOT_ERR_BAD_PACKET,
988 					    "packet too short");
989 					goto done;
990 				}
991 				err = fetch_error(buf, r);
992 				goto done;
993 			} else {
994 				err = got_error_msg(GOT_ERR_BAD_PACKET,
995 				    "unknown side-band received from server");
996 				goto done;
997 			}
998 		} else {
999 			/* No sideband channel. Every byte is packfile data. */
1000 			err = readn(&r, fd, buf, sizeof buf);
1001 			if (err)
1002 				goto done;
1003 			if (r <= 0)
1004 				break;
1005 		}
1006 
1007 		/*
1008 		 * An expected SHA1 checksum sits at the end of the pack file.
1009 		 * Since we don't know the file size ahead of time we have to
1010 		 * keep SHA1_DIGEST_LENGTH bytes buffered and avoid mixing
1011 		 * those bytes into our SHA1 checksum computation until we
1012 		 * know for sure that additional pack file data bytes follow.
1013 		 *
1014 		 * We can assume r > 0 since otherwise the loop would exit.
1015 		 */
1016 		if (r < SHA1_DIGEST_LENGTH) {
1017 			if (sha1_buf_len < SHA1_DIGEST_LENGTH) {
1018 				/*
1019 				 * If there's enough buffered + read data to
1020 				 * fill up the buffer then shift a sufficient
1021 				 * amount of bytes out at the front to make
1022 				 * room, mixing those bytes into the checksum.
1023 				 */
1024 				while (sha1_buf_len > 0 &&
1025 				    sha1_buf_len + r > SHA1_DIGEST_LENGTH) {
1026 					SHA1Update(&sha1_ctx, sha1_buf, 1);
1027 					memmove(sha1_buf, sha1_buf + 1, 1);
1028 					sha1_buf_len--;
1029 				}
1030 
1031 				/* Buffer potential checksum bytes. */
1032 				memcpy(sha1_buf + sha1_buf_len, buf, r);
1033 				sha1_buf_len += r;
1034 			} else {
1035 				/*
1036 				 * Mix in previously buffered bytes which
1037 				 * are not part of the checksum after all.
1038 				 */
1039 				SHA1Update(&sha1_ctx, sha1_buf, r);
1040 
1041 				/* Update potential checksum buffer. */
1042 				memmove(sha1_buf, sha1_buf + r,
1043 				    sha1_buf_len - r);
1044 				memcpy(sha1_buf + sha1_buf_len - r, buf, r);
1045 			}
1046 		} else {
1047 			/* Mix in any previously buffered bytes. */
1048 			SHA1Update(&sha1_ctx, sha1_buf, sha1_buf_len);
1049 
1050 			/* Mix in bytes read minus potential checksum bytes. */
1051 			SHA1Update(&sha1_ctx, buf, r - SHA1_DIGEST_LENGTH);
1052 
1053 			/* Buffer potential checksum bytes. */
1054 			memcpy(sha1_buf, buf + r - SHA1_DIGEST_LENGTH,
1055 			    SHA1_DIGEST_LENGTH);
1056 			sha1_buf_len = SHA1_DIGEST_LENGTH;
1057 		}
1058 	
1059 		/* Write packfile data to temporary pack file. */
1060 		w = write(packfd, buf, r);
1061 		if (w == -1) {
1062 			err = got_error_from_errno("write");
1063 			goto done;
1064 		}
1065 		if (w != r) {
1066 			err = got_error(GOT_ERR_IO);
1067 			goto done;
1068 		}
1069 		packsz += w;
1070 
1071 		/* Don't send too many progress privsep messages. */
1072 		if (packsz > last_reported_packsz + 1024) {
1073 			err = send_fetch_download_progress(ibuf, packsz);
1074 			if (err)
1075 				goto done;
1076 			last_reported_packsz = packsz;
1077 		}
1078 	}
1079 	err = send_fetch_download_progress(ibuf, packsz);
1080 	if (err)
1081 		goto done;
1082 
1083 	SHA1Final(pack_sha1, &sha1_ctx);
1084 	if (sha1_buf_len != SHA1_DIGEST_LENGTH ||
1085 	    memcmp(pack_sha1, sha1_buf, sha1_buf_len) != 0) {
1086 		err = got_error_msg(GOT_ERR_BAD_PACKFILE,
1087 		    "pack file checksum mismatch");
1088 	}
1089 done:
1090 	TAILQ_FOREACH(pe, &symrefs, entry) {
1091 		free((void *)pe->path);
1092 		free(pe->data);
1093 	}
1094 	got_pathlist_free(&symrefs);
1095 	free(have);
1096 	free(want);
1097 	free(id_str);
1098 	free(refname);
1099 	free(server_capabilities);
1100 	return err;
1101 }
1102 
1103 
1104 int
1105 main(int argc, char **argv)
1106 {
1107 	const struct got_error *err = NULL;
1108 	int fetchfd, packfd = -1, i;
1109 	uint8_t pack_sha1[SHA1_DIGEST_LENGTH];
1110 	struct imsgbuf ibuf;
1111 	struct imsg imsg;
1112 	struct got_pathlist_head have_refs;
1113 	struct got_pathlist_head wanted_branches;
1114 	struct got_pathlist_head wanted_refs;
1115 	struct got_pathlist_entry *pe;
1116 	struct got_imsg_fetch_request fetch_req;
1117 	struct got_imsg_fetch_have_ref href;
1118 	struct got_imsg_fetch_wanted_branch wbranch;
1119 	struct got_imsg_fetch_wanted_ref wref;
1120 	size_t datalen;
1121 #if 0
1122 	static int attached;
1123 	while (!attached)
1124 		sleep (1);
1125 #endif
1126 
1127 	TAILQ_INIT(&have_refs);
1128 	TAILQ_INIT(&wanted_branches);
1129 	TAILQ_INIT(&wanted_refs);
1130 
1131 	imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
1132 #ifndef PROFILE
1133 	/* revoke access to most system calls */
1134 	if (pledge("stdio recvfd", NULL) == -1) {
1135 		err = got_error_from_errno("pledge");
1136 		got_privsep_send_error(&ibuf, err);
1137 		return 1;
1138 	}
1139 #endif
1140 	if ((err = got_privsep_recv_imsg(&imsg, &ibuf, 0)) != 0) {
1141 		if (err->code == GOT_ERR_PRIVSEP_PIPE)
1142 			err = NULL;
1143 		goto done;
1144 	}
1145 	if (imsg.hdr.type == GOT_IMSG_STOP)
1146 		goto done;
1147 	if (imsg.hdr.type != GOT_IMSG_FETCH_REQUEST) {
1148 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1149 		goto done;
1150 	}
1151 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1152 	if (datalen < sizeof(fetch_req)) {
1153 		err = got_error(GOT_ERR_PRIVSEP_LEN);
1154 		goto done;
1155 	}
1156 	memcpy(&fetch_req, imsg.data, sizeof(fetch_req));
1157 	fetchfd = imsg.fd;
1158 	imsg_free(&imsg);
1159 
1160 	if (fetch_req.verbosity > 0)
1161 		chattygot += fetch_req.verbosity;
1162 
1163 	for (i = 0; i < fetch_req.n_have_refs; i++) {
1164 		struct got_object_id *id;
1165 		char *refname;
1166 
1167 		if ((err = got_privsep_recv_imsg(&imsg, &ibuf, 0)) != 0) {
1168 			if (err->code == GOT_ERR_PRIVSEP_PIPE)
1169 				err = NULL;
1170 			goto done;
1171 		}
1172 		if (imsg.hdr.type == GOT_IMSG_STOP)
1173 			goto done;
1174 		if (imsg.hdr.type != GOT_IMSG_FETCH_HAVE_REF) {
1175 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1176 			goto done;
1177 		}
1178 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1179 		if (datalen < sizeof(href)) {
1180 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1181 			goto done;
1182 		}
1183 		memcpy(&href, imsg.data, sizeof(href));
1184 		if (datalen - sizeof(href) < href.name_len) {
1185 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1186 			goto done;
1187 		}
1188 		refname = malloc(href.name_len + 1);
1189 		if (refname == NULL) {
1190 			err = got_error_from_errno("malloc");
1191 			goto done;
1192 		}
1193 		memcpy(refname, imsg.data + sizeof(href), href.name_len);
1194 		refname[href.name_len] = '\0';
1195 
1196 		id = malloc(sizeof(*id));
1197 		if (id == NULL) {
1198 			free(refname);
1199 			err = got_error_from_errno("malloc");
1200 			goto done;
1201 		}
1202 		memcpy(id->sha1, href.id, SHA1_DIGEST_LENGTH);
1203 		err = got_pathlist_append(&have_refs, refname, id);
1204 		if (err) {
1205 			free(refname);
1206 			free(id);
1207 			goto done;
1208 		}
1209 
1210 		imsg_free(&imsg);
1211 	}
1212 
1213 	for (i = 0; i < fetch_req.n_wanted_branches; i++) {
1214 		char *refname;
1215 
1216 		if ((err = got_privsep_recv_imsg(&imsg, &ibuf, 0)) != 0) {
1217 			if (err->code == GOT_ERR_PRIVSEP_PIPE)
1218 				err = NULL;
1219 			goto done;
1220 		}
1221 		if (imsg.hdr.type == GOT_IMSG_STOP)
1222 			goto done;
1223 		if (imsg.hdr.type != GOT_IMSG_FETCH_WANTED_BRANCH) {
1224 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1225 			goto done;
1226 		}
1227 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1228 		if (datalen < sizeof(wbranch)) {
1229 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1230 			goto done;
1231 		}
1232 		memcpy(&wbranch, imsg.data, sizeof(wbranch));
1233 		if (datalen - sizeof(wbranch) < wbranch.name_len) {
1234 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1235 			goto done;
1236 		}
1237 		refname = malloc(wbranch.name_len + 1);
1238 		if (refname == NULL) {
1239 			err = got_error_from_errno("malloc");
1240 			goto done;
1241 		}
1242 		memcpy(refname, imsg.data + sizeof(wbranch), wbranch.name_len);
1243 		refname[wbranch.name_len] = '\0';
1244 
1245 		err = got_pathlist_append(&wanted_branches, refname, NULL);
1246 		if (err) {
1247 			free(refname);
1248 			goto done;
1249 		}
1250 
1251 		imsg_free(&imsg);
1252 	}
1253 
1254 	for (i = 0; i < fetch_req.n_wanted_refs; i++) {
1255 		char *refname;
1256 
1257 		if ((err = got_privsep_recv_imsg(&imsg, &ibuf, 0)) != 0) {
1258 			if (err->code == GOT_ERR_PRIVSEP_PIPE)
1259 				err = NULL;
1260 			goto done;
1261 		}
1262 		if (imsg.hdr.type == GOT_IMSG_STOP)
1263 			goto done;
1264 		if (imsg.hdr.type != GOT_IMSG_FETCH_WANTED_REF) {
1265 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1266 			goto done;
1267 		}
1268 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1269 		if (datalen < sizeof(wref)) {
1270 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1271 			goto done;
1272 		}
1273 		memcpy(&wref, imsg.data, sizeof(wref));
1274 		if (datalen - sizeof(wref) < wref.name_len) {
1275 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1276 			goto done;
1277 		}
1278 		refname = malloc(wref.name_len + 1);
1279 		if (refname == NULL) {
1280 			err = got_error_from_errno("malloc");
1281 			goto done;
1282 		}
1283 		memcpy(refname, imsg.data + sizeof(wref), wref.name_len);
1284 		refname[wref.name_len] = '\0';
1285 
1286 		err = got_pathlist_append(&wanted_refs, refname, NULL);
1287 		if (err) {
1288 			free(refname);
1289 			goto done;
1290 		}
1291 
1292 		imsg_free(&imsg);
1293 	}
1294 
1295 	if ((err = got_privsep_recv_imsg(&imsg, &ibuf, 0)) != 0) {
1296 		if (err->code == GOT_ERR_PRIVSEP_PIPE)
1297 			err = NULL;
1298 		goto done;
1299 	}
1300 	if (imsg.hdr.type == GOT_IMSG_STOP)
1301 		goto done;
1302 	if (imsg.hdr.type != GOT_IMSG_FETCH_OUTFD) {
1303 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1304 		goto done;
1305 	}
1306 	if (imsg.hdr.len - IMSG_HEADER_SIZE != 0) {
1307 		err = got_error(GOT_ERR_PRIVSEP_LEN);
1308 		goto done;
1309 	}
1310 	packfd = imsg.fd;
1311 
1312 	err = fetch_pack(fetchfd, packfd, pack_sha1, &have_refs,
1313 	    fetch_req.fetch_all_branches, &wanted_branches,
1314 	    &wanted_refs, fetch_req.list_refs_only, &ibuf);
1315 done:
1316 	TAILQ_FOREACH(pe, &have_refs, entry) {
1317 		free((char *)pe->path);
1318 		free(pe->data);
1319 	}
1320 	got_pathlist_free(&have_refs);
1321 	TAILQ_FOREACH(pe, &wanted_branches, entry)
1322 		free((char *)pe->path);
1323 	got_pathlist_free(&wanted_branches);
1324 	if (fetchfd != -1 && close(fetchfd) == -1 && err == NULL)
1325 		err = got_error_from_errno("close");
1326 	if (packfd != -1 && close(packfd) == -1 && err == NULL)
1327 		err = got_error_from_errno("close");
1328 	if (err != NULL)
1329 		got_privsep_send_error(&ibuf, err);
1330 	else
1331 		err = send_fetch_done(&ibuf, pack_sha1);
1332 	if (err != NULL) {
1333 		fprintf(stderr, "%s: %s\n", getprogname(), err->msg);
1334 		got_privsep_send_error(&ibuf, err);
1335 	}
1336 
1337 	exit(0);
1338 }