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Date:: Sun May 5 10:29:08 2024 UTC
Message:: make new pkt read timeout apply only to gotsh, not the client-side helpers
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1 /*
2  * Copyright (c) 2022 Stefan Sperling <stsp@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 
21 #include <errno.h>
22 #include <event.h>
23 #include <poll.h>
24 #include <limits.h>
25 #include <sha1.h>
26 #include <sha2.h>
27 #include <stdio.h>
28 #include <stdint.h>
29 #include <stdlib.h>
30 #include <string.h>
31 #include <imsg.h>
32 #include <unistd.h>
33 
34 #include "got_error.h"
35 #include "got_serve.h"
36 #include "got_path.h"
37 #include "got_version.h"
38 #include "got_reference.h"
39 #include "got_object.h"
40 
41 #include "got_lib_pkt.h"
42 #include "got_lib_dial.h"
43 #include "got_lib_gitproto.h"
44 #include "got_lib_hash.h"
45 #include "got_lib_poll.h"
46 
47 #include "gotd.h"
48 
49 #ifndef nitems
50 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
51 #endif
52 
53 /*
54  * Number of seconds until we give up trying to read more
55  * data from the client connection.
56  */
57 static const int timeout = 60;
58 
59 static const struct got_capability read_capabilities[] = {
60 	{ GOT_CAPA_AGENT, "got/" GOT_VERSION_STR },
61 	{ GOT_CAPA_OFS_DELTA, NULL },
62 	{ GOT_CAPA_SIDE_BAND_64K, NULL },
63 };
64 
65 static const struct got_capability write_capabilities[] = {
66 	{ GOT_CAPA_AGENT, "got/" GOT_VERSION_STR },
67 	{ GOT_CAPA_OFS_DELTA, NULL },
68 	{ GOT_CAPA_REPORT_STATUS, NULL },
69 	{ GOT_CAPA_NO_THIN, NULL },
70 	{ GOT_CAPA_DELETE_REFS, NULL },
71 };
72 
73 static const struct got_error *
74 append_read_capabilities(size_t *capalen, size_t len, const char *symrefstr,
75     uint8_t *buf, size_t bufsize)
76 {
77 	struct got_capability capa[nitems(read_capabilities) + 1];
78 	size_t ncapa;
79 
80 	memcpy(&capa, read_capabilities, sizeof(read_capabilities));
81 	if (symrefstr) {
82 		capa[nitems(read_capabilities)].key = "symref";
83 		capa[nitems(read_capabilities)].value = symrefstr;
84 		ncapa = nitems(capa);
85 	} else
86 		ncapa = nitems(read_capabilities);
87 
88 	return got_gitproto_append_capabilities(capalen, buf, len,
89 	    bufsize, capa, ncapa);
90 }
91 
92 static const struct got_error *
93 send_ref(int outfd, uint8_t *id, const char *refname, int send_capabilities,
94     int client_is_reading, const char *symrefstr, int chattygot)
95 {
96 	const struct got_error *err = NULL;
97 	char hex[SHA1_DIGEST_STRING_LENGTH];
98 	char buf[GOT_PKT_MAX];
99 	size_t len, capalen = 0;
100 
101 	if (got_sha1_digest_to_str(id, hex, sizeof(hex)) == NULL)
102 		return got_error(GOT_ERR_BAD_OBJ_ID);
103 
104 	len = snprintf(buf, sizeof(buf), "%s %s", hex, refname);
105 	if (len >= sizeof(buf))
106 		return got_error(GOT_ERR_NO_SPACE);
107 
108 	if (send_capabilities) {
109 		if (client_is_reading) {
110 			err = append_read_capabilities(&capalen, len,
111 			    symrefstr, buf, sizeof(buf));
112 		} else {
113 			err = got_gitproto_append_capabilities(&capalen,
114 			    buf, len, sizeof(buf), write_capabilities,
115 			    nitems(write_capabilities));
116 		}
117 		if (err)
118 			return err;
119 		len += capalen;
120 	}
121 
122 	if (len + 1 >= sizeof(buf))
123 		return got_error(GOT_ERR_NO_SPACE);
124 	buf[len] = '\n';
125 	len++;
126 	buf[len] = '\0';
127 
128 	return got_pkt_writepkt(outfd, buf, len, chattygot);
129 }
130 
131 static const struct got_error *
132 send_zero_refs(int outfd, int client_is_reading, int chattygot)
133 {
134 	const struct got_error *err = NULL;
135 	const char *line = GOT_SHA1_STRING_ZERO " capabilities^{}";
136 	char buf[GOT_PKT_MAX];
137 	size_t len, capalen = 0;
138 
139 	len = strlcpy(buf, line, sizeof(buf));
140 	if (len >= sizeof(buf))
141 		return got_error(GOT_ERR_NO_SPACE);
142 
143 	if (client_is_reading) {
144 		err = got_gitproto_append_capabilities(&capalen, buf, len,
145 		    sizeof(buf), read_capabilities, nitems(read_capabilities));
146 		if (err)
147 			return err;
148 	} else {
149 		err = got_gitproto_append_capabilities(&capalen, buf, len,
150 		    sizeof(buf), write_capabilities,
151 		    nitems(write_capabilities));
152 		if (err)
153 			return err;
154 	}
155 
156 	return got_pkt_writepkt(outfd, buf, len + capalen, chattygot);
157 }
158 
159 static void
160 echo_error(const struct got_error *err, int outfd, int chattygot)
161 {
162 	char buf[4 + GOT_ERR_MAX_MSG_SIZE];
163 	size_t len;
164 
165 	/*
166 	 * Echo the error to the client on a pkt-line.
167 	 * The client should then terminate its session.
168 	 */
169 	buf[0] = 'E'; buf[1] = 'R'; buf[2] = 'R'; buf[3] = ' '; buf[4] = '\0';
170 	len = strlcat(buf, err->msg, sizeof(buf));
171 	got_pkt_writepkt(outfd, buf, len, chattygot);
172 }
173 
174 static const struct got_error *
175 announce_refs(int outfd, struct imsgbuf *ibuf, int client_is_reading,
176     const char *repo_path, int chattygot)
177 {
178 	const struct got_error *err = NULL;
179 	struct imsg imsg;
180 	size_t datalen;
181 	struct gotd_imsg_list_refs lsref;
182 	struct gotd_imsg_reflist ireflist;
183 	struct gotd_imsg_ref iref;
184 	struct gotd_imsg_symref isymref;
185 	size_t nrefs = 0;
186 	int have_nrefs = 0, sent_capabilities = 0;
187 	char *symrefname = NULL, *symreftarget = NULL, *symrefstr = NULL;
188 	char *refname = NULL;
189 
190 	memset(&imsg, 0, sizeof(imsg));
191 	memset(&lsref, 0, sizeof(lsref));
192 
193 	if (strlcpy(lsref.repo_name, repo_path, sizeof(lsref.repo_name)) >=
194 	    sizeof(lsref.repo_name))
195 		return got_error(GOT_ERR_NO_SPACE);
196 	lsref.client_is_reading = client_is_reading;
197 
198 	if (imsg_compose(ibuf, GOTD_IMSG_LIST_REFS, 0, 0, -1,
199 	    &lsref, sizeof(lsref)) == -1)
200 		return got_error_from_errno("imsg_compose LIST_REFS");
201 
202 	err = gotd_imsg_flush(ibuf);
203 	if (err)
204 		return err;
205 
206 	while (!have_nrefs || nrefs > 0) {
207 		err = gotd_imsg_poll_recv(&imsg, ibuf, 0);
208 		if (err)
209 			goto done;
210 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
211 		switch (imsg.hdr.type) {
212 		case GOTD_IMSG_ERROR:
213 			err = gotd_imsg_recv_error(NULL, &imsg);
214 			goto done;
215 		case GOTD_IMSG_REFLIST:
216 			if (have_nrefs || nrefs > 0) {
217 				err = got_error(GOT_ERR_PRIVSEP_MSG);
218 				goto done;
219 			}
220 			if (datalen != sizeof(ireflist)) {
221 				err = got_error(GOT_ERR_PRIVSEP_MSG);
222 				goto done;
223 			}
224 			memcpy(&ireflist, imsg.data, sizeof(ireflist));
225 			nrefs = ireflist.nrefs;
226 			have_nrefs = 1;
227 			if (nrefs == 0)
228 				err = send_zero_refs(outfd, client_is_reading,
229 				    chattygot);
230 			break;
231 		case GOTD_IMSG_REF:
232 			if (!have_nrefs || nrefs == 0) {
233 				err = got_error(GOT_ERR_PRIVSEP_MSG);
234 				goto done;
235 			}
236 			if (datalen < sizeof(iref)) {
237 				err = got_error(GOT_ERR_PRIVSEP_MSG);
238 				goto done;
239 			}
240 			memcpy(&iref, imsg.data, sizeof(iref));
241 			if (datalen != sizeof(iref) + iref.name_len) {
242 				err = got_error(GOT_ERR_PRIVSEP_LEN);
243 				goto done;
244 			}
245 			refname = strndup(imsg.data + sizeof(iref),
246 			    iref.name_len);
247 			if (refname == NULL) {
248 				err = got_error_from_errno("strndup");
249 				goto done;
250 			}
251 			err = send_ref(outfd, iref.id, refname,
252 			    !sent_capabilities, client_is_reading,
253 			    NULL, chattygot);
254 			free(refname);
255 			refname = NULL;
256 			if (err)
257 				goto done;
258 			sent_capabilities = 1;
259 			if (nrefs > 0)
260 				nrefs--;
261 			break;
262 		case GOTD_IMSG_SYMREF:
263 			if (!have_nrefs || nrefs == 0) {
264 				err = got_error(GOT_ERR_PRIVSEP_MSG);
265 				goto done;
266 			}
267 			if (datalen < sizeof(isymref)) {
268 				err = got_error(GOT_ERR_PRIVSEP_LEN);
269 				goto done;
270 			}
271 			memcpy(&isymref, imsg.data, sizeof(isymref));
272 			if (datalen != sizeof(isymref) + isymref.name_len +
273 			    isymref.target_len) {
274 				err = got_error(GOT_ERR_PRIVSEP_LEN);
275 				goto done;
276 			}
277 
278 			/*
279 			 * For now, we only announce one symbolic ref,
280 			 * as part of our capability advertisement.
281 			 */
282 			if (sent_capabilities || symrefstr != NULL ||
283 			    symrefname != NULL || symreftarget != NULL)
284 				break;
285 
286 			symrefname = strndup(imsg.data + sizeof(isymref),
287 			    isymref.name_len);
288 			if (symrefname == NULL) {
289 				err = got_error_from_errno("malloc");
290 				goto done;
291 			}
292 
293 			symreftarget = strndup(
294 			    imsg.data + sizeof(isymref) + isymref.name_len,
295 			    isymref.target_len);
296 			if (symreftarget == NULL) {
297 				err = got_error_from_errno("strndup");
298 				goto done;
299 			}
300 
301 			if (asprintf(&symrefstr, "%s:%s", symrefname,
302 			    symreftarget) == -1) {
303 				err = got_error_from_errno("asprintf");
304 				goto done;
305 			}
306 			err = send_ref(outfd, isymref.target_id, symrefname,
307 			    !sent_capabilities, client_is_reading, symrefstr,
308 			    chattygot);
309 			free(refname);
310 			refname = NULL;
311 			if (err)
312 				goto done;
313 			sent_capabilities = 1;
314 			if (nrefs > 0)
315 				nrefs--;
316 			break;
317 		default:
318 			err = got_error(GOT_ERR_PRIVSEP_MSG);
319 			break;
320 		}
321 
322 		imsg_free(&imsg);
323 	}
324 
325 	err = got_pkt_flushpkt(outfd, chattygot);
326 	if (err)
327 		goto done;
328 done:
329 	free(symrefstr);
330 	free(symrefname);
331 	free(symreftarget);
332 	return err;
333 }
334 
335 static const struct got_error *
336 parse_want_line(char **common_capabilities, uint8_t *id, char *buf, size_t len)
337 {
338 	const struct got_error *err;
339 	char *id_str = NULL, *client_capabilities = NULL;
340 
341 	err = got_gitproto_parse_want_line(&id_str,
342 	    &client_capabilities, buf, len);
343 	if (err)
344 		return err;
345 
346 	if (!got_parse_hash_digest(id, id_str, GOT_HASH_SHA1)) {
347 		err = got_error_msg(GOT_ERR_BAD_PACKET,
348 		    "want-line with bad object ID");
349 		goto done;
350 	}
351 
352 	if (client_capabilities) {
353 		err = got_gitproto_match_capabilities(common_capabilities,
354 		    NULL, client_capabilities, read_capabilities,
355 		    nitems(read_capabilities));
356 		if (err)
357 			goto done;
358 	}
359 done:
360 	free(id_str);
361 	free(client_capabilities);
362 	return err;
363 }
364 
365 static const struct got_error *
366 parse_have_line(uint8_t *id, char *buf, size_t len)
367 {
368 	const struct got_error *err;
369 	char *id_str = NULL;
370 
371 	err = got_gitproto_parse_have_line(&id_str, buf, len);
372 	if (err)
373 		return err;
374 
375 	if (!got_parse_hash_digest(id, id_str, GOT_HASH_SHA1)) {
376 		err = got_error_msg(GOT_ERR_BAD_PACKET,
377 		    "have-line with bad object ID");
378 		goto done;
379 	}
380 done:
381 	free(id_str);
382 	return err;
383 }
384 
385 static const struct got_error *
386 send_capability(struct got_capability *capa, struct imsgbuf *ibuf)
387 {
388 	const struct got_error *err = NULL;
389 	struct gotd_imsg_capability icapa;
390 	size_t len;
391 	struct ibuf *wbuf;
392 
393 	memset(&icapa, 0, sizeof(icapa));
394 
395 	icapa.key_len = strlen(capa->key);
396 	len = sizeof(icapa) + icapa.key_len;
397 	if (capa->value) {
398 		icapa.value_len = strlen(capa->value);
399 		len += icapa.value_len;
400 	}
401 
402 	wbuf = imsg_create(ibuf, GOTD_IMSG_CAPABILITY, 0, 0, len);
403 	if (wbuf == NULL) {
404 		err = got_error_from_errno("imsg_create CAPABILITY");
405 		return err;
406 	}
407 
408 	if (imsg_add(wbuf, &icapa, sizeof(icapa)) == -1)
409 		return got_error_from_errno("imsg_add CAPABILITY");
410 	if (imsg_add(wbuf, capa->key, icapa.key_len) == -1)
411 		return got_error_from_errno("imsg_add CAPABILITY");
412 	if (capa->value) {
413 		if (imsg_add(wbuf, capa->value, icapa.value_len) == -1)
414 			return got_error_from_errno("imsg_add CAPABILITY");
415 	}
416 
417 	imsg_close(ibuf, wbuf);
418 
419 	return NULL;
420 }
421 
422 static const struct got_error *
423 send_capabilities(int *use_sidebands, int *report_status,
424     char *capabilities_str, struct imsgbuf *ibuf)
425 {
426 	const struct got_error *err = NULL;
427 	struct gotd_imsg_capabilities icapas;
428 	struct got_capability *capa = NULL;
429 	size_t ncapa, i;
430 
431 	err = got_gitproto_split_capabilities_str(&capa, &ncapa,
432 	    capabilities_str);
433 	if (err)
434 		return err;
435 
436 	icapas.ncapabilities = ncapa;
437 	if (imsg_compose(ibuf, GOTD_IMSG_CAPABILITIES, 0, 0, -1,
438 	    &icapas, sizeof(icapas)) == -1) {
439 		err = got_error_from_errno("imsg_compose IMSG_CAPABILITIES");
440 		goto done;
441 	}
442 
443 	for (i = 0; i < ncapa; i++) {
444 		err = send_capability(&capa[i], ibuf);
445 		if (err)
446 			goto done;
447 		if (use_sidebands &&
448 		    strcmp(capa[i].key, GOT_CAPA_SIDE_BAND_64K) == 0)
449 			*use_sidebands = 1;
450 		if (report_status &&
451 		    strcmp(capa[i].key, GOT_CAPA_REPORT_STATUS) == 0)
452 			*report_status = 1;
453 	}
454 done:
455 	free(capa);
456 	return err;
457 }
458 
459 static const struct got_error *
460 forward_flushpkt(struct imsgbuf *ibuf)
461 {
462 	if (imsg_compose(ibuf, GOTD_IMSG_FLUSH, 0, 0, -1, NULL, 0) == -1)
463 		return got_error_from_errno("imsg_compose FLUSH");
464 
465 	return gotd_imsg_flush(ibuf);
466 }
467 
468 static const struct got_error *
469 recv_ack(struct imsg *imsg, uint8_t *expected_id)
470 {
471 	struct gotd_imsg_ack iack;
472 	size_t datalen;
473 
474 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
475 	if (datalen != sizeof(iack))
476 		return got_error(GOT_ERR_PRIVSEP_LEN);
477 
478 	memcpy(&iack, imsg->data, sizeof(iack));
479 	if (memcmp(iack.object_id, expected_id, SHA1_DIGEST_LENGTH) != 0)
480 		return got_error(GOT_ERR_BAD_OBJ_ID);
481 
482 	return NULL;
483 }
484 
485 static const struct got_error *
486 recv_nak(struct imsg *imsg, uint8_t *expected_id)
487 {
488 	struct gotd_imsg_ack inak;
489 	size_t datalen;
490 
491 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
492 	if (datalen != sizeof(inak))
493 		return got_error(GOT_ERR_PRIVSEP_LEN);
494 
495 	memcpy(&inak, imsg->data, sizeof(inak));
496 	if (memcmp(inak.object_id, expected_id, SHA1_DIGEST_LENGTH) != 0)
497 		return got_error(GOT_ERR_BAD_OBJ_ID);
498 
499 	return NULL;
500 }
501 
502 
503 static const struct got_error *
504 recv_want(int *use_sidebands, int outfd, struct imsgbuf *ibuf,
505     char *buf, size_t len, int expect_capabilities, int chattygot)
506 {
507 	const struct got_error *err;
508 	struct gotd_imsg_want iwant;
509 	char *capabilities_str;
510 	int done = 0;
511 	struct imsg imsg;
512 
513 	memset(&iwant, 0, sizeof(iwant));
514 	memset(&imsg, 0, sizeof(imsg));
515 
516 	err = parse_want_line(&capabilities_str, iwant.object_id, buf, len);
517 	if (err)
518 		return err;
519 
520 	if (capabilities_str) {
521 		if (!expect_capabilities) {
522 			err = got_error_msg(GOT_ERR_BAD_PACKET,
523 			    "unexpected capability announcement received");
524 			goto done;
525 		}
526 		err = send_capabilities(use_sidebands, NULL, capabilities_str,
527 		    ibuf);
528 		if (err)
529 			goto done;
530 
531 	}
532 
533 	if (imsg_compose(ibuf, GOTD_IMSG_WANT, 0, 0, -1,
534 	    &iwant, sizeof(iwant)) == -1) {
535 		err = got_error_from_errno("imsg_compose WANT");
536 		goto done;
537 	}
538 
539 	err = gotd_imsg_flush(ibuf);
540 	if (err)
541 		goto done;
542 
543 	/*
544 	 * Wait for an ACK, or an error in case the desired object
545 	 * does not exist.
546 	 */
547 	while (!done && err == NULL) {
548 		err = gotd_imsg_poll_recv(&imsg, ibuf, 0);
549 		if (err)
550 			break;
551 		switch (imsg.hdr.type) {
552 		case GOTD_IMSG_ERROR:
553 			err = gotd_imsg_recv_error(NULL, &imsg);
554 			break;
555 		case GOTD_IMSG_ACK:
556 			err = recv_ack(&imsg, iwant.object_id);
557 			if (err)
558 				break;
559 			done = 1;
560 			break;
561 		default:
562 			err = got_error(GOT_ERR_PRIVSEP_MSG);
563 			break;
564 		}
565 
566 		imsg_free(&imsg);
567 	}
568 done:
569 	free(capabilities_str);
570 	return err;
571 }
572 
573 static const struct got_error *
574 send_ack(int outfd, uint8_t *id, int chattygot)
575 {
576 	char hex[SHA1_DIGEST_STRING_LENGTH];
577 	char buf[GOT_PKT_MAX];
578 	int len;
579 
580 	if (got_sha1_digest_to_str(id, hex, sizeof(hex)) == NULL)
581 		return got_error(GOT_ERR_BAD_OBJ_ID);
582 
583 	len = snprintf(buf, sizeof(buf), "ACK %s\n", hex);
584 	if (len >= sizeof(buf))
585 		return got_error(GOT_ERR_NO_SPACE);
586 
587 	return got_pkt_writepkt(outfd, buf, len, chattygot);
588 }
589 
590 static const struct got_error *
591 send_nak(int outfd, int chattygot)
592 {
593 	char buf[5];
594 	int len;
595 
596 	len = snprintf(buf, sizeof(buf), "NAK\n");
597 	if (len >= sizeof(buf))
598 		return got_error(GOT_ERR_NO_SPACE);
599 
600 	return got_pkt_writepkt(outfd, buf, len, chattygot);
601 }
602 
603 static const struct got_error *
604 recv_have(int *have_ack, int outfd, struct imsgbuf *ibuf, char *buf,
605     size_t len, int chattygot)
606 {
607 	const struct got_error *err;
608 	struct gotd_imsg_have ihave;
609 	int done = 0;
610 	struct imsg imsg;
611 
612 	memset(&ihave, 0, sizeof(ihave));
613 	memset(&imsg, 0, sizeof(imsg));
614 
615 	err = parse_have_line(ihave.object_id, buf, len);
616 	if (err)
617 		return err;
618 
619 	if (imsg_compose(ibuf, GOTD_IMSG_HAVE, 0, 0, -1,
620 	    &ihave, sizeof(ihave)) == -1)
621 		return got_error_from_errno("imsg_compose HAVE");
622 
623 	err = gotd_imsg_flush(ibuf);
624 	if (err)
625 		return err;
626 
627 	/*
628 	 * Wait for an ACK or a NAK, indicating whether a common
629 	 * commit object has been found.
630 	 */
631 	while (!done && err == NULL) {
632 		err = gotd_imsg_poll_recv(&imsg, ibuf, 0);
633 		if (err)
634 			return err;
635 		switch (imsg.hdr.type) {
636 		case GOTD_IMSG_ERROR:
637 			err = gotd_imsg_recv_error(NULL, &imsg);
638 			break;
639 		case GOTD_IMSG_ACK:
640 			err = recv_ack(&imsg, ihave.object_id);
641 			if (err)
642 				break;
643 			if (!*have_ack) {
644 				err = send_ack(outfd, ihave.object_id,
645 				    chattygot);
646 				if (err)
647 					return err;
648 				*have_ack = 1;
649 			}
650 			done = 1;
651 			break;
652 		case GOTD_IMSG_NAK:
653 			err = recv_nak(&imsg, ihave.object_id);
654 			if (err)
655 				break;
656 			done = 1;
657 			break;
658 		default:
659 			err = got_error(GOT_ERR_PRIVSEP_MSG);
660 			break;
661 		}
662 
663 		imsg_free(&imsg);
664 	}
665 
666 	return err;
667 }
668 
669 static const struct got_error *
670 recv_done(int *packfd, int outfd, struct imsgbuf *ibuf, int chattygot)
671 {
672 	const struct got_error *err;
673 	struct imsg imsg;
674 	int fd;
675 
676 	*packfd = -1;
677 
678 	if (imsg_compose(ibuf, GOTD_IMSG_DONE, 0, 0, -1, NULL, 0) == -1)
679 		return got_error_from_errno("imsg_compose DONE");
680 
681 	err = gotd_imsg_flush(ibuf);
682 	if (err)
683 		return err;
684 
685 	while (*packfd == -1 && err == NULL) {
686 		err = gotd_imsg_poll_recv(&imsg, ibuf, 0);
687 		if (err)
688 			break;
689 
690 		switch (imsg.hdr.type) {
691 		case GOTD_IMSG_ERROR:
692 			err = gotd_imsg_recv_error(NULL, &imsg);
693 			break;
694 		case GOTD_IMSG_PACKFILE_PIPE:
695 			fd = imsg_get_fd(&imsg);
696 			if (fd != -1)
697 				*packfd = fd;
698 			else
699 				err = got_error(GOT_ERR_PRIVSEP_NO_FD);
700 			break;
701 		default:
702 			err = got_error(GOT_ERR_PRIVSEP_MSG);
703 			break;
704 		}
705 
706 		imsg_free(&imsg);
707 	}
708 
709 	return err;
710 }
711 
712 static const struct got_error *
713 relay_progress_reports(struct imsgbuf *ibuf, int outfd, int chattygot)
714 {
715 	const struct got_error *err = NULL;
716 	int pack_starting = 0;
717 	struct gotd_imsg_packfile_progress iprog;
718 	char buf[GOT_PKT_MAX];
719 	struct imsg imsg;
720 	size_t datalen;
721 	int p_deltify = 0, n;
722 	const char *eol = "\r";
723 
724 	memset(&imsg, 0, sizeof(imsg));
725 
726 	while (!pack_starting && err == NULL) {
727 		err = gotd_imsg_poll_recv(&imsg, ibuf, 0);
728 		if (err)
729 			break;
730 
731 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
732 		switch (imsg.hdr.type) {
733 		case GOTD_IMSG_ERROR:
734 			err = gotd_imsg_recv_error(NULL, &imsg);
735 			break;
736 		case GOTD_IMSG_PACKFILE_READY:
737 			eol = "\n";
738 			pack_starting = 1;
739 			/* fallthrough */
740 		case GOTD_IMSG_PACKFILE_PROGRESS:
741 			if (datalen != sizeof(iprog)) {
742 				err = got_error(GOT_ERR_PRIVSEP_LEN);
743 				break;
744 			}
745 			memcpy(&iprog, imsg.data, sizeof(iprog));
746 			if (iprog.nobj_total > 0) {
747 				p_deltify = (iprog.nobj_deltify * 100) /
748 				    iprog.nobj_total;
749 			}
750 			buf[0] = GOT_SIDEBAND_PROGRESS_INFO;
751 			n = snprintf(&buf[1], sizeof(buf) - 1,
752 			    "%d commits colored, "
753 			    "%d objects found, "
754 			    "deltify %d%%%s",
755 			    iprog.ncolored,
756 			    iprog.nfound,
757 			    p_deltify, eol);
758 			if (n >= sizeof(buf) - 1)
759 				break;
760 			err = got_pkt_writepkt(outfd, buf, 1 + n, chattygot);
761 			break;
762 		default:
763 			err = got_error(GOT_ERR_PRIVSEP_MSG);
764 			break;
765 		}
766 
767 		imsg_free(&imsg);
768 	}
769 
770 	return err;
771 }
772 
773 static const struct got_error *
774 serve_read(int infd, int outfd, int gotd_sock, const char *repo_path,
775     int chattygot)
776 {
777 	const struct got_error *err = NULL;
778 	char buf[GOT_PKT_MAX];
779 	struct imsgbuf ibuf;
780 	enum protostate {
781 		STATE_EXPECT_WANT,
782 		STATE_EXPECT_MORE_WANT,
783 		STATE_EXPECT_HAVE_OR_DONE,
784 		STATE_DONE,
785 	};
786 	enum protostate curstate = STATE_EXPECT_WANT;
787 	int have_ack = 0, use_sidebands = 0, seen_have = 0;
788 	int packfd = -1;
789 	size_t pack_chunksize;
790 
791 	imsg_init(&ibuf, gotd_sock);
792 
793 	err = announce_refs(outfd, &ibuf, 1, repo_path, chattygot);
794 	if (err)
795 		goto done;
796 
797 	while (curstate != STATE_DONE) {
798 		int n;
799 		buf[0] = '\0';
800 		err = got_pkt_readpkt(&n, infd, buf, sizeof(buf), chattygot,
801 		    timeout);
802 		if (err)
803 			goto done;
804 		if (n == 0) {
805 			if (curstate != STATE_EXPECT_WANT &&
806 			    curstate != STATE_EXPECT_MORE_WANT &&
807 			    curstate != STATE_EXPECT_HAVE_OR_DONE) {
808 				err = got_error_msg(GOT_ERR_BAD_PACKET,
809 				    "unexpected flush packet received");
810 				goto done;
811 			}
812 
813 			if (curstate == STATE_EXPECT_WANT) {
814 				ssize_t r;
815 				/*
816 				 * If the client does not want to fetch
817 				 * anything we should receive a flush
818 				 * packet followed by EOF.
819 				 */
820 				r = read(infd, buf, sizeof(buf));
821 				if (r == -1) {
822 					err = got_error_from_errno("read");
823 					goto done;
824 				}
825 				if (r == 0) /* EOF */
826 					goto done;
827 
828 				/* Zero-length field followed by payload. */
829 				err = got_error_msg(GOT_ERR_BAD_PACKET,
830 				    "unexpected flush packet received");
831 				goto done;
832 			}
833 
834 			if (curstate == STATE_EXPECT_WANT ||
835 			    curstate == STATE_EXPECT_MORE_WANT ||
836 			    curstate == STATE_EXPECT_HAVE_OR_DONE) {
837 				err = forward_flushpkt(&ibuf);
838 				if (err)
839 					goto done;
840 			}
841 			if (curstate == STATE_EXPECT_HAVE_OR_DONE &&
842 			    !have_ack) {
843 				err = send_nak(outfd, chattygot);
844 				if (err)
845 					goto done;
846 			}
847 			if (curstate == STATE_EXPECT_MORE_WANT)
848 				curstate = STATE_EXPECT_HAVE_OR_DONE;
849 		} else if (n >= 5 && strncmp(buf, "want ", 5) == 0) {
850 			if (curstate != STATE_EXPECT_WANT &&
851 			    curstate != STATE_EXPECT_MORE_WANT) {
852 				err = got_error_msg(GOT_ERR_BAD_PACKET,
853 				    "unexpected 'want' packet");
854 				goto done;
855 			}
856 			err = recv_want(&use_sidebands, outfd, &ibuf, buf, n,
857 			    curstate == STATE_EXPECT_WANT ? 1 : 0, chattygot);
858 			if (err)
859 				goto done;
860 			if (curstate == STATE_EXPECT_WANT)
861 				curstate = STATE_EXPECT_MORE_WANT;
862 		} else if (n >= 5 && strncmp(buf, "have ", 5) == 0) {
863 			if (curstate != STATE_EXPECT_HAVE_OR_DONE) {
864 				err = got_error_msg(GOT_ERR_BAD_PACKET,
865 				    "unexpected 'have' packet");
866 				goto done;
867 			}
868 			err = recv_have(&have_ack, outfd, &ibuf,
869 			    buf, n, chattygot);
870 			if (err)
871 				goto done;
872 			seen_have = 1;
873 		} else if (n == 5 && strncmp(buf, "done\n", 5) == 0) {
874 			if (curstate != STATE_EXPECT_HAVE_OR_DONE) {
875 				err = got_error_msg(GOT_ERR_BAD_PACKET,
876 				    "unexpected 'done' packet");
877 				goto done;
878 			}
879 			err = recv_done(&packfd, outfd, &ibuf, chattygot);
880 			if (err)
881 				goto done;
882 			curstate = STATE_DONE;
883 			break;
884 		} else {
885 			err = got_error(GOT_ERR_BAD_PACKET);
886 			goto done;
887 		}
888 	}
889 
890 	if (!seen_have) {
891 		err = send_nak(outfd, chattygot);
892 		if (err)
893 			goto done;
894 	}
895 
896 	if (use_sidebands) {
897 		err = relay_progress_reports(&ibuf, outfd, chattygot);
898 		if (err)
899 			goto done;
900 		pack_chunksize = GOT_SIDEBAND_64K_PACKFILE_DATA_MAX;
901 	} else
902 		pack_chunksize = sizeof(buf);
903 
904 	for (;;) {
905 		ssize_t r;
906 
907 		r = read(packfd, use_sidebands ? &buf[1] : buf,
908 		    pack_chunksize);
909 		if (r == -1) {
910 			err = got_error_from_errno("read");
911 			break;
912 		} else if (r == 0) {
913 			err = got_pkt_flushpkt(outfd, chattygot);
914 			break;
915 		}
916 
917 		if (use_sidebands) {
918 			buf[0] = GOT_SIDEBAND_PACKFILE_DATA;
919 			err = got_pkt_writepkt(outfd, buf, 1 + r, chattygot);
920 			if (err)
921 				break;
922 		} else {
923 			err = got_poll_write_full(outfd, buf, r);
924 			if (err) {
925 				if (err->code == GOT_ERR_EOF)
926 					err = NULL;
927 				break;
928 			}
929 		}
930 	}
931 done:
932 	imsg_clear(&ibuf);
933 	if (packfd != -1 && close(packfd) == -1 && err == NULL)
934 		err = got_error_from_errno("close");
935 	if (err)
936 		echo_error(err, outfd, chattygot);
937 	return err;
938 }
939 
940 static const struct got_error *
941 parse_ref_update_line(char **common_capabilities, char **refname,
942     uint8_t *old_id, uint8_t *new_id, char *buf, size_t len)
943 {
944 	const struct got_error *err;
945 	char *old_id_str = NULL, *new_id_str = NULL;
946 	char *client_capabilities = NULL;
947 
948 	*refname = NULL;
949 
950 	err = got_gitproto_parse_ref_update_line(&old_id_str, &new_id_str,
951 	    refname, &client_capabilities, buf, len);
952 	if (err)
953 		return err;
954 
955 	if (!got_parse_hash_digest(old_id, old_id_str, GOT_HASH_SHA1) ||
956 	    !got_parse_hash_digest(new_id, new_id_str, GOT_HASH_SHA1)) {
957 		err = got_error_msg(GOT_ERR_BAD_PACKET,
958 		    "ref-update with bad object ID");
959 		goto done;
960 	}
961 	if (!got_ref_name_is_valid(*refname)) {
962 		err = got_error_msg(GOT_ERR_BAD_PACKET,
963 		    "ref-update with bad reference name");
964 		goto done;
965 	}
966 
967 	if (client_capabilities) {
968 		err = got_gitproto_match_capabilities(common_capabilities,
969 		    NULL, client_capabilities, write_capabilities,
970 		    nitems(write_capabilities));
971 		if (err)
972 			goto done;
973 	}
974 done:
975 	free(old_id_str);
976 	free(new_id_str);
977 	free(client_capabilities);
978 	if (err) {
979 		free(*refname);
980 		*refname = NULL;
981 	}
982 	return err;
983 }
984 
985 static const struct got_error *
986 recv_ref_update(int *report_status, int outfd, struct imsgbuf *ibuf,
987     char *buf, size_t len, int expect_capabilities, int chattygot)
988 {
989 	const struct got_error *err;
990 	struct gotd_imsg_ref_update iref;
991 	struct ibuf *wbuf;
992 	char *capabilities_str = NULL, *refname = NULL;
993 	int done = 0;
994 	struct imsg imsg;
995 
996 	memset(&iref, 0, sizeof(iref));
997 	memset(&imsg, 0, sizeof(imsg));
998 
999 	err = parse_ref_update_line(&capabilities_str, &refname,
1000 	    iref.old_id, iref.new_id, buf, len);
1001 	if (err)
1002 		return err;
1003 
1004 	if (capabilities_str) {
1005 		if (!expect_capabilities) {
1006 			err = got_error_msg(GOT_ERR_BAD_PACKET,
1007 			    "unexpected capability announcement received");
1008 			goto done;
1009 		}
1010 		err = send_capabilities(NULL, report_status, capabilities_str,
1011 		    ibuf);
1012 		if (err)
1013 			goto done;
1014 	}
1015 
1016 	iref.name_len = strlen(refname);
1017 	len = sizeof(iref) + iref.name_len;
1018 	wbuf = imsg_create(ibuf, GOTD_IMSG_REF_UPDATE, 0, 0, len);
1019 	if (wbuf == NULL) {
1020 		err = got_error_from_errno("imsg_create REF_UPDATE");
1021 		goto done;
1022 	}
1023 
1024 	if (imsg_add(wbuf, &iref, sizeof(iref)) == -1)
1025 		return got_error_from_errno("imsg_add REF_UPDATE");
1026 	if (imsg_add(wbuf, refname, iref.name_len) == -1)
1027 		return got_error_from_errno("imsg_add REF_UPDATE");
1028 	imsg_close(ibuf, wbuf);
1029 
1030 	err = gotd_imsg_flush(ibuf);
1031 	if (err)
1032 		goto done;
1033 
1034 	/* Wait for ACK or an error. */
1035 	while (!done && err == NULL) {
1036 		err = gotd_imsg_poll_recv(&imsg, ibuf, 0);
1037 		if (err)
1038 			break;
1039 		switch (imsg.hdr.type) {
1040 		case GOTD_IMSG_ERROR:
1041 			err = gotd_imsg_recv_error(NULL, &imsg);
1042 			break;
1043 		case GOTD_IMSG_ACK:
1044 			err = recv_ack(&imsg, iref.new_id);
1045 			if (err)
1046 				break;
1047 			done = 1;
1048 			break;
1049 		default:
1050 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1051 			break;
1052 		}
1053 
1054 		imsg_free(&imsg);
1055 	}
1056 done:
1057 	free(capabilities_str);
1058 	free(refname);
1059 	return err;
1060 }
1061 
1062 static const struct got_error *
1063 recv_packfile(struct imsg *imsg, int infd)
1064 {
1065 	const struct got_error *err = NULL;
1066 	size_t datalen;
1067 	int packfd;
1068 	char buf[GOT_PKT_MAX];
1069 	int pack_done = 0;
1070 
1071 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1072 	if (datalen != 0)
1073 		return got_error(GOT_ERR_PRIVSEP_MSG);
1074 
1075 	packfd = imsg_get_fd(imsg);
1076 	if (packfd == -1)
1077 		return got_error(GOT_ERR_PRIVSEP_NO_FD);
1078 
1079 	while (!pack_done) {
1080 		ssize_t r = 0;
1081 
1082 		err = got_poll_fd(infd, POLLIN, 1);
1083 		if (err) {
1084 			if (err->code != GOT_ERR_TIMEOUT)
1085 				break;
1086 			err = NULL;
1087 		} else {
1088 			r = read(infd, buf, sizeof(buf));
1089 			if (r == -1) {
1090 				err = got_error_from_errno("read");
1091 				break;
1092 			}
1093 			if (r == 0) {
1094 				/*
1095 				 * Git clients hang up their side of the
1096 				 * connection after sending the pack file.
1097 				 */
1098 				err = NULL;
1099 				pack_done = 1;
1100 				break;
1101 			}
1102 		}
1103 
1104 		if (r == 0) {
1105 			/* Detect gotd(8) closing the pack pipe when done. */
1106 			err = got_poll_fd(packfd, 0, 1);
1107 			if (err) {
1108 				if (err->code != GOT_ERR_TIMEOUT &&
1109 				    err->code != GOT_ERR_EOF)
1110 					break;
1111 				if (err->code == GOT_ERR_EOF)
1112 					pack_done = 1;
1113 				err = NULL;
1114 			}
1115 		} else {
1116 			/* Write pack data and/or detect pipe being closed. */
1117 			err = got_poll_write_full(packfd, buf, r);
1118 			if (err) {
1119 				if (err->code == GOT_ERR_EOF)
1120 					err = NULL;
1121 				break;
1122 			}
1123 		}
1124 	}
1125 
1126 	close(packfd);
1127 	return err;
1128 }
1129 
1130 static const struct got_error *
1131 report_unpack_status(struct imsg *imsg, int outfd, int chattygot)
1132 {
1133 	const struct got_error *err = NULL;
1134 	struct gotd_imsg_packfile_status istatus;
1135 	char buf[GOT_PKT_MAX];
1136 	size_t datalen, len;
1137 	char *reason = NULL;
1138 
1139 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1140 	if (datalen < sizeof(istatus))
1141 		return got_error(GOT_ERR_PRIVSEP_LEN);
1142 	memcpy(&istatus, imsg->data, sizeof(istatus));
1143 	if (datalen != sizeof(istatus) + istatus.reason_len)
1144 		return got_error(GOT_ERR_PRIVSEP_LEN);
1145 
1146 	reason = strndup(imsg->data + sizeof(istatus), istatus.reason_len);
1147 	if (reason == NULL) {
1148 		err = got_error_from_errno("strndup");
1149 		goto done;
1150 	}
1151 
1152 	if (err == NULL)
1153 		len = snprintf(buf, sizeof(buf), "unpack ok\n");
1154 	else
1155 		len = snprintf(buf, sizeof(buf), "unpack %s\n", reason);
1156 	if (len >= sizeof(buf)) {
1157 		err = got_error(GOT_ERR_NO_SPACE);
1158 		goto done;
1159 	}
1160 
1161 	err = got_pkt_writepkt(outfd, buf, len, chattygot);
1162 done:
1163 	free(reason);
1164 	return err;
1165 }
1166 
1167 static const struct got_error *
1168 recv_ref_update_ok(struct imsg *imsg, int outfd, int chattygot)
1169 {
1170 	const struct got_error *err = NULL;
1171 	struct gotd_imsg_ref_update_ok iok;
1172 	size_t datalen, len;
1173 	char buf[GOT_PKT_MAX];
1174 	char *refname = NULL;
1175 
1176 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1177 	if (datalen < sizeof(iok))
1178 		return got_error(GOT_ERR_PRIVSEP_LEN);
1179 	memcpy(&iok, imsg->data, sizeof(iok));
1180 	if (datalen != sizeof(iok) + iok.name_len)
1181 		return got_error(GOT_ERR_PRIVSEP_LEN);
1182 
1183 	memcpy(&iok, imsg->data, sizeof(iok));
1184 
1185 	refname = strndup(imsg->data + sizeof(iok), iok.name_len);
1186 	if (refname == NULL)
1187 		return got_error_from_errno("strndup");
1188 
1189 	len = snprintf(buf, sizeof(buf), "ok %s\n", refname);
1190 	if (len >= sizeof(buf)) {
1191 		err = got_error(GOT_ERR_NO_SPACE);
1192 		goto done;
1193 	}
1194 
1195 	err = got_pkt_writepkt(outfd, buf, len, chattygot);
1196 done:
1197 	free(refname);
1198 	return err;
1199 }
1200 
1201 static const struct got_error *
1202 recv_ref_update_ng(struct imsg *imsg, int outfd, int chattygot)
1203 {
1204 	const struct got_error *err = NULL;
1205 	struct gotd_imsg_ref_update_ng ing;
1206 	size_t datalen, len;
1207 	char buf[GOT_PKT_MAX];
1208 	char *refname = NULL, *reason = NULL;
1209 
1210 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1211 	if (datalen < sizeof(ing))
1212 		return got_error(GOT_ERR_PRIVSEP_LEN);
1213 	memcpy(&ing, imsg->data, sizeof(ing));
1214 	if (datalen != sizeof(ing) + ing.name_len + ing.reason_len)
1215 		return got_error(GOT_ERR_PRIVSEP_LEN);
1216 
1217 	memcpy(&ing, imsg->data, sizeof(ing));
1218 
1219 	refname = strndup(imsg->data + sizeof(ing), ing.name_len);
1220 	if (refname == NULL)
1221 		return got_error_from_errno("strndup");
1222 
1223 	reason = strndup(imsg->data + sizeof(ing) + ing.name_len,
1224 	    ing.reason_len);
1225 	if (reason == NULL) {
1226 		err = got_error_from_errno("strndup");
1227 		goto done;
1228 	}
1229 
1230 	len = snprintf(buf, sizeof(buf), "ng %s %s\n", refname, reason);
1231 	if (len >= sizeof(buf)) {
1232 		err = got_error(GOT_ERR_NO_SPACE);
1233 		goto done;
1234 	}
1235 
1236 	err = got_pkt_writepkt(outfd, buf, len, chattygot);
1237 done:
1238 	free(refname);
1239 	free(reason);
1240 	return err;
1241 }
1242 
1243 static const struct got_error *
1244 serve_write(int infd, int outfd, int gotd_sock, const char *repo_path,
1245     int chattygot)
1246 {
1247 	const struct got_error *err = NULL;
1248 	char buf[GOT_PKT_MAX];
1249 	struct imsgbuf ibuf;
1250 	enum protostate {
1251 		STATE_EXPECT_REF_UPDATE,
1252 		STATE_EXPECT_MORE_REF_UPDATES,
1253 		STATE_EXPECT_PACKFILE,
1254 		STATE_PACKFILE_RECEIVED,
1255 		STATE_REFS_UPDATED,
1256 	};
1257 	enum protostate curstate = STATE_EXPECT_REF_UPDATE;
1258 	struct imsg imsg;
1259 	int report_status = 0;
1260 
1261 	imsg_init(&ibuf, gotd_sock);
1262 	memset(&imsg, 0, sizeof(imsg));
1263 
1264 	err = announce_refs(outfd, &ibuf, 0, repo_path, chattygot);
1265 	if (err)
1266 		goto done;
1267 
1268 	while (curstate != STATE_EXPECT_PACKFILE) {
1269 		int n;
1270 		buf[0] = '\0';
1271 		err = got_pkt_readpkt(&n, infd, buf, sizeof(buf), chattygot,
1272 		    timeout);
1273 		if (err)
1274 			goto done;
1275 		if (n == 0) {
1276 			if (curstate == STATE_EXPECT_REF_UPDATE) {
1277 				/* The client will not send us anything. */
1278 				goto done;
1279 			} else if (curstate != STATE_EXPECT_MORE_REF_UPDATES) {
1280 				err = got_error_msg(GOT_ERR_BAD_PACKET,
1281 				    "unexpected flush packet received");
1282 				goto done;
1283 			}
1284 			err = forward_flushpkt(&ibuf);
1285 			if (err)
1286 				goto done;
1287 			curstate = STATE_EXPECT_PACKFILE;
1288 		} else if (n >= (SHA1_DIGEST_STRING_LENGTH * 2) + 2) {
1289 			if (curstate != STATE_EXPECT_REF_UPDATE &&
1290 			    curstate != STATE_EXPECT_MORE_REF_UPDATES) {
1291 				err = got_error_msg(GOT_ERR_BAD_PACKET,
1292 				    "unexpected ref-update packet");
1293 				goto done;
1294 			}
1295 			if (curstate == STATE_EXPECT_REF_UPDATE) {
1296 				err = recv_ref_update(&report_status,
1297 				    outfd, &ibuf, buf, n, 1, chattygot);
1298 			} else {
1299 				err = recv_ref_update(NULL, outfd, &ibuf,
1300 				    buf, n, 0, chattygot);
1301 			}
1302 			if (err)
1303 				goto done;
1304 			curstate = STATE_EXPECT_MORE_REF_UPDATES;
1305 		} else {
1306 			err = got_error(GOT_ERR_BAD_PACKET);
1307 			goto done;
1308 		}
1309 	}
1310 
1311 	while (curstate != STATE_PACKFILE_RECEIVED) {
1312 		err = gotd_imsg_poll_recv(&imsg, &ibuf, 0);
1313 		if (err)
1314 			goto done;
1315 		switch (imsg.hdr.type) {
1316 		case GOTD_IMSG_ERROR:
1317 			err = gotd_imsg_recv_error(NULL, &imsg);
1318 			goto done;
1319 		case GOTD_IMSG_PACKFILE_PIPE:
1320 			err = recv_packfile(&imsg, infd);
1321 			if (err) {
1322 				if (err->code != GOT_ERR_EOF)
1323 					goto done;
1324 				/*
1325 				 * EOF is reported when the client hangs up,
1326 				 * which can happen with Git clients.
1327 				 * The socket should stay half-open so we
1328 				 * can still send our reports if requested.
1329 				 */
1330 				err = NULL;
1331 			}
1332 			curstate = STATE_PACKFILE_RECEIVED;
1333 			break;
1334 		default:
1335 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1336 			break;
1337 		}
1338 
1339 		imsg_free(&imsg);
1340 		if (err)
1341 			goto done;
1342 	}
1343 
1344 	while (curstate != STATE_REFS_UPDATED && err == NULL) {
1345 		err = gotd_imsg_poll_recv(&imsg, &ibuf, 0);
1346 		if (err)
1347 			break;
1348 		switch (imsg.hdr.type) {
1349 		case GOTD_IMSG_ERROR:
1350 			err = gotd_imsg_recv_error(NULL, &imsg);
1351 			break;
1352 		case GOTD_IMSG_PACKFILE_STATUS:
1353 			if (!report_status)
1354 				break;
1355 			err = report_unpack_status(&imsg, outfd, chattygot);
1356 			break;
1357 		case GOTD_IMSG_REF_UPDATE_OK:
1358 			if (!report_status)
1359 				break;
1360 			err = recv_ref_update_ok(&imsg, outfd, chattygot);
1361 			break;
1362 		case GOTD_IMSG_REF_UPDATE_NG:
1363 			if (!report_status)
1364 				break;
1365 			err = recv_ref_update_ng(&imsg, outfd, chattygot);
1366 			break;
1367 		case GOTD_IMSG_REFS_UPDATED:
1368 			curstate = STATE_REFS_UPDATED;
1369 			err = got_pkt_flushpkt(outfd, chattygot);
1370 			break;
1371 		default:
1372 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1373 			break;
1374 		}
1375 
1376 		imsg_free(&imsg);
1377 	}
1378 done:
1379 	imsg_clear(&ibuf);
1380 	if (err)
1381 		echo_error(err, outfd, chattygot);
1382 	return err;
1383 }
1384 
1385 const struct got_error *
1386 got_serve(int infd, int outfd, const char *command, const char *repo_path,
1387     int gotd_sock, int chattygot)
1388 {
1389 	const struct got_error *err = NULL;
1390 
1391 	if (strcmp(command, GOT_DIAL_CMD_FETCH) == 0)
1392 		err = serve_read(infd, outfd, gotd_sock, repo_path, chattygot);
1393 	else if (strcmp(command, GOT_DIAL_CMD_SEND) == 0)
1394 		err = serve_write(infd, outfd, gotd_sock, repo_path,
1395 		    chattygot);
1396 	else
1397 		err = got_error(GOT_ERR_BAD_PACKET);
1398 
1399 	return err;
1400 }