1 /*
2  * Copyright (c) 2019 Ori Bernstein <ori@openbsd.org>
3  * Copyright (c) 2021 Stefan Sperling <stsp@openbsd.org>
4  *
5  * Permission to use, copy, modify, and distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  */
17 
18 #include <sys/types.h>
19 #include <sys/queue.h>
20 #include <sys/uio.h>
21 #include <sys/time.h>
22 #include <sys/stat.h>
23 
24 #include <stdint.h>
25 #include <errno.h>
26 #include <limits.h>
27 #include <signal.h>
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <string.h>
31 #include <ctype.h>
32 #include <fcntl.h>
33 #include <unistd.h>
34 #include <zlib.h>
35 #include <err.h>
36 
37 #include "got_error.h"
38 #include "got_object.h"
39 #include "got_path.h"
40 #include "got_version.h"
41 #include "got_fetch.h"
42 #include "got_reference.h"
43 
44 #include "got_lib_sha1.h"
45 #include "got_lib_delta.h"
46 #include "got_lib_object.h"
47 #include "got_lib_object_parse.h"
48 #include "got_lib_privsep.h"
49 #include "got_lib_pack.h"
50 #include "got_lib_pkt.h"
51 #include "got_lib_gitproto.h"
52 #include "got_lib_ratelimit.h"
53 
54 #ifndef nitems
55 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
56 #endif
57 
58 struct got_object *indexed;
59 static int chattygot;
60 
61 static const struct got_capability got_capabilities[] = {
62 	{ GOT_CAPA_AGENT, "got/" GOT_VERSION_STR },
63 	{ GOT_CAPA_OFS_DELTA, NULL },
64 #if 0
65 	{ GOT_CAPA_SIDE_BAND_64K, NULL },
66 #endif
67 	{ GOT_CAPA_REPORT_STATUS, NULL },
68 	{ GOT_CAPA_DELETE_REFS, NULL },
69 };
70 
71 static const struct got_error *
72 send_upload_progress(struct imsgbuf *ibuf, off_t bytes,
73     struct got_ratelimit *rl)
74 {
75 	const struct got_error *err = NULL;
76 	int elapsed = 0;
77 
78 	if (rl) {
79 		err = got_ratelimit_check(&elapsed, rl);
80 		if (err || !elapsed)
81 			return err;
82 	}
83 
84 	if (imsg_compose(ibuf, GOT_IMSG_SEND_UPLOAD_PROGRESS, 0, 0, -1,
85 	    &bytes, sizeof(bytes)) == -1)
86 		return got_error_from_errno(
87 		    "imsg_compose SEND_UPLOAD_PROGRESS");
88 
89 	return got_privsep_flush_imsg(ibuf);
90 }
91 
92 static const struct got_error *
93 send_pack_request(struct imsgbuf *ibuf)
94 {
95 	if (imsg_compose(ibuf, GOT_IMSG_SEND_PACK_REQUEST, 0, 0, -1,
96 	    NULL, 0) == -1)
97 		return got_error_from_errno("imsg_compose SEND_PACK_REQUEST");
98 	return got_privsep_flush_imsg(ibuf);
99 }
100 
101 static const struct got_error *
102 send_done(struct imsgbuf *ibuf)
103 {
104 	if (imsg_compose(ibuf, GOT_IMSG_SEND_DONE, 0, 0, -1, NULL, 0) == -1)
105 		return got_error_from_errno("imsg_compose SEND_DONE");
106 	return got_privsep_flush_imsg(ibuf);
107 }
108 
109 static const struct got_error *
110 recv_packfd(int *packfd, struct imsgbuf *ibuf)
111 {
112 	const struct got_error *err;
113 	struct imsg imsg;
114 
115 	*packfd = -1;
116 
117 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
118 	if (err)
119 		return err;
120 
121 	if (imsg.hdr.type == GOT_IMSG_STOP) {
122 		err = got_error(GOT_ERR_CANCELLED);
123 		goto done;
124 	}
125 
126 	if (imsg.hdr.type != GOT_IMSG_SEND_PACKFD) {
127 		err = got_error(GOT_ERR_PRIVSEP_MSG);
128 		goto done;
129 	}
130 
131 	if (imsg.hdr.len - IMSG_HEADER_SIZE != 0) {
132 		err = got_error(GOT_ERR_PRIVSEP_LEN);
133 		goto done;
134 	}
135 
136 	*packfd = imsg.fd;
137 done:
138 	imsg_free(&imsg);
139 	return err;
140 }
141 
142 static const struct got_error *
143 send_pack_file(int sendfd, int packfd, struct imsgbuf *ibuf)
144 {
145 	const struct got_error *err;
146 	unsigned char buf[8192];
147 	ssize_t r, w;
148 	off_t wtotal = 0;
149 	struct got_ratelimit rl;
150 
151 	if (lseek(packfd, 0L, SEEK_SET) == -1)
152 		return got_error_from_errno("lseek");
153 
154 	got_ratelimit_init(&rl, 0, 500);
155 
156 	for (;;) {
157 		r = read(packfd, buf, sizeof(buf));
158 		if (r == -1)
159 			return got_error_from_errno("read");
160 		if (r == 0)
161 			break;
162 		w = write(sendfd, buf, r);
163 		if (w == -1)
164 			return got_error_from_errno("write");
165 		if (w != r)
166 			return got_error(GOT_ERR_IO);
167 		wtotal += w;
168 		err = send_upload_progress(ibuf, wtotal, &rl);
169 		if (err)
170 			return err;
171 	}
172 
173 	return send_upload_progress(ibuf, wtotal, NULL);
174 }
175 
176 static const struct got_error *
177 send_error(const char *buf, size_t len)
178 {
179 	static char msg[1024];
180 	size_t i;
181 
182 	for (i = 0; i < len && i < sizeof(msg) - 1; i++) {
183 		if (!isprint(buf[i]))
184 			return got_error_msg(GOT_ERR_BAD_PACKET,
185 			    "non-printable error message received from server");
186 		msg[i] = buf[i];
187 	}
188 	msg[i] = '\0';
189 	return got_error_msg(GOT_ERR_SEND_FAILED, msg);
190 }
191 
192 static const struct got_error *
193 send_their_ref(struct imsgbuf *ibuf, struct got_object_id *refid,
194     const char *refname)
195 {
196 	struct ibuf *wbuf;
197 	size_t len, reflen = strlen(refname);
198 
199 	len = sizeof(struct got_imsg_send_remote_ref) + reflen;
200 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE)
201 		return got_error(GOT_ERR_NO_SPACE);
202 
203 	wbuf = imsg_create(ibuf, GOT_IMSG_SEND_REMOTE_REF, 0, 0, len);
204 	if (wbuf == NULL)
205 		return got_error_from_errno("imsg_create SEND_REMOTE_REF");
206 
207 	/* Keep in sync with struct got_imsg_send_remote_ref definition! */
208 	if (imsg_add(wbuf, refid->sha1, SHA1_DIGEST_LENGTH) == -1)
209 		return got_error_from_errno("imsg_add SEND_REMOTE_REF");
210 	if (imsg_add(wbuf, &reflen, sizeof(reflen)) == -1)
211 		return got_error_from_errno("imsg_add SEND_REMOTE_REF");
212 	if (imsg_add(wbuf, refname, reflen) == -1)
213 		return got_error_from_errno("imsg_add SEND_REMOTE_REF");
214 
215 	wbuf->fd = -1;
216 	imsg_close(ibuf, wbuf);
217 	return got_privsep_flush_imsg(ibuf);
218 }
219 
220 static const struct got_error *
221 send_ref_status(struct imsgbuf *ibuf, const char *refname, int success,
222     struct got_pathlist_head *refs, struct got_pathlist_head *delete_refs)
223 {
224 	struct ibuf *wbuf;
225 	size_t len, reflen = strlen(refname);
226 	struct got_pathlist_entry *pe;
227 	int ref_valid = 0;
228 	char *eol;
229 
230 	eol = strchr(refname, '\n');
231 	if (eol == NULL) {
232 		return got_error_msg(GOT_ERR_BAD_PACKET,
233 		    "unexpected message from server");
234 	}
235 	*eol = '\0';
236 
237 	TAILQ_FOREACH(pe, refs, entry) {
238 		if (strcmp(refname, pe->path) == 0) {
239 			ref_valid = 1;
240 			break;
241 		}
242 	}
243 	if (!ref_valid) {
244 		TAILQ_FOREACH(pe, delete_refs, entry) {
245 			if (strcmp(refname, pe->path) == 0) {
246 				ref_valid = 1;
247 				break;
248 			}
249 		}
250 	}
251 	if (!ref_valid) {
252 		return got_error_msg(GOT_ERR_BAD_PACKET,
253 		    "unexpected message from server");
254 	}
255 
256 	len = sizeof(struct got_imsg_send_ref_status) + reflen;
257 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE)
258 		return got_error(GOT_ERR_NO_SPACE);
259 
260 	wbuf = imsg_create(ibuf, GOT_IMSG_SEND_REF_STATUS,
261 	    0, 0, len);
262 	if (wbuf == NULL)
263 		return got_error_from_errno("imsg_create SEND_REF_STATUS");
264 
265 	/* Keep in sync with struct got_imsg_send_ref_status definition! */
266 	if (imsg_add(wbuf, &success, sizeof(success)) == -1)
267 		return got_error_from_errno("imsg_add SEND_REF_STATUS");
268 	if (imsg_add(wbuf, &reflen, sizeof(reflen)) == -1)
269 		return got_error_from_errno("imsg_add SEND_REF_STATUS");
270 	if (imsg_add(wbuf, refname, reflen) == -1)
271 		return got_error_from_errno("imsg_add SEND_REF_STATUS");
272 
273 	wbuf->fd = -1;
274 	imsg_close(ibuf, wbuf);
275 	return got_privsep_flush_imsg(ibuf);
276 }
277 
278 static const struct got_error *
279 describe_refchange(int *n, int *sent_my_capabilites,
280     const char *my_capabilities, char *buf, size_t bufsize,
281     const char *refname, const char *old_hashstr, const char *new_hashstr)
282 {
283 	*n = snprintf(buf, bufsize, "%s %s %s",
284 	    old_hashstr, new_hashstr, refname);
285 	if (*n < 0 || (size_t)*n >= bufsize)
286 		return got_error(GOT_ERR_NO_SPACE);
287 
288 	/*
289 	 * We must announce our capabilities along with the first
290 	 * reference. Unfortunately, the protocol requires an embedded
291 	 * NUL as a separator between reference name and capabilities,
292 	 * which we have to deal with here.
293 	 * It also requires a linefeed for terminating packet data.
294 	 */
295 	if (!*sent_my_capabilites && my_capabilities != NULL) {
296 		int m;
297 		if (*n >= bufsize - 1)
298 			return got_error(GOT_ERR_NO_SPACE);
299 		m = snprintf(buf + *n + 1, /* offset after '\0' */
300 		    bufsize - (*n + 1), "%s\n", my_capabilities);
301 		if (m < 0 || *n + m >= bufsize)
302 			return got_error(GOT_ERR_NO_SPACE);
303 		*n += m;
304 		*sent_my_capabilites = 1;
305 	} else {
306 		*n = strlcat(buf, "\n", bufsize);
307 		if (*n >= bufsize)
308 			return got_error(GOT_ERR_NO_SPACE);
309 	}
310 
311 	return NULL;
312 }
313 
314 static const struct got_error *
315 send_pack(int fd, struct got_pathlist_head *refs,
316     struct got_pathlist_head *delete_refs, struct imsgbuf *ibuf)
317 {
318 	const struct got_error *err = NULL;
319 	char buf[GOT_PKT_MAX];
320 	const unsigned char zero_id[SHA1_DIGEST_LENGTH] = { 0 };
321 	char old_hashstr[SHA1_DIGEST_STRING_LENGTH];
322 	char new_hashstr[SHA1_DIGEST_STRING_LENGTH];
323 	struct got_pathlist_head their_refs;
324 	int is_firstpkt = 1;
325 	int n, nsent = 0;
326 	int packfd = -1;
327 	char *id_str = NULL, *refname = NULL;
328 	struct got_object_id *id = NULL;
329 	char *server_capabilities = NULL, *my_capabilities = NULL;
330 	struct got_pathlist_entry *pe;
331 	int sent_my_capabilites = 0;
332 
333 	TAILQ_INIT(&their_refs);
334 
335 	if (TAILQ_EMPTY(refs) && TAILQ_EMPTY(delete_refs))
336 		return got_error(GOT_ERR_SEND_EMPTY);
337 
338 	while (1) {
339 		err = got_pkt_readpkt(&n, fd, buf, sizeof(buf), chattygot);
340 		if (err)
341 			goto done;
342 		if (n == 0)
343 			break;
344 		if (n >= 4 && strncmp(buf, "ERR ", 4) == 0) {
345 			err = send_error(&buf[4], n - 4);
346 			goto done;
347 		}
348 		free(id_str);
349 		free(refname);
350 		err = got_gitproto_parse_refline(&id_str, &refname,
351 		    &server_capabilities, buf, n);
352 		if (err)
353 			goto done;
354 		if (is_firstpkt) {
355 			if (chattygot && server_capabilities[0] != '\0')
356 				fprintf(stderr, "%s: server capabilities: %s\n",
357 				    getprogname(), server_capabilities);
358 			err = got_gitproto_match_capabilities(&my_capabilities,
359 			    NULL, server_capabilities, got_capabilities,
360 			    nitems(got_capabilities));
361 			if (err)
362 				goto done;
363 			if (chattygot)
364 				fprintf(stderr, "%s: my capabilities:%s\n",
365 				    getprogname(), my_capabilities);
366 			is_firstpkt = 0;
367 		}
368 		if (strstr(refname, "^{}")) {
369 			if (chattygot) {
370 				fprintf(stderr, "%s: ignoring %s\n",
371 				    getprogname(), refname);
372 			}
373 			continue;
374 		}
375 
376 		id = malloc(sizeof(*id));
377 		if (id == NULL) {
378 			err = got_error_from_errno("malloc");
379 			goto done;
380 		}
381 		if (!got_parse_sha1_digest(id->sha1, id_str)) {
382 			err = got_error(GOT_ERR_BAD_OBJ_ID_STR);
383 			goto done;
384 		}
385 		err = send_their_ref(ibuf, id, refname);
386 		if (err)
387 			goto done;
388 
389 		err = got_pathlist_append(&their_refs, refname, id);
390 		if (err)
391 			goto done;
392 
393 		if (chattygot)
394 			fprintf(stderr, "%s: remote has %s %s\n",
395 			    getprogname(), refname, id_str);
396 		free(id_str);
397 		id_str = NULL;
398 		refname = NULL; /* do not free; owned by their_refs */
399 		id = NULL; /* do not free; owned by their_refs */
400 	}
401 
402 	if (!TAILQ_EMPTY(delete_refs)) {
403 		if (my_capabilities == NULL ||
404 		    strstr(my_capabilities, GOT_CAPA_DELETE_REFS) == NULL) {
405 			err = got_error(GOT_ERR_CAPA_DELETE_REFS);
406 			goto done;
407 		}
408 	}
409 
410 	TAILQ_FOREACH(pe, delete_refs, entry) {
411 		const char *refname = pe->path;
412 		struct got_pathlist_entry *their_pe;
413 		struct got_object_id *their_id = NULL;
414 
415 		TAILQ_FOREACH(their_pe, &their_refs, entry) {
416 			const char *their_refname = their_pe->path;
417 			if (got_path_cmp(refname, their_refname,
418 			    strlen(refname), strlen(their_refname)) == 0) {
419 				their_id = their_pe->data;
420 				break;
421 			}
422 		}
423 		if (their_id == NULL) {
424 			err = got_error_fmt(GOT_ERR_NOT_REF,
425 			    "%s does not exist in remote repository",
426 			    refname);
427 			goto done;
428 		}
429 
430 		got_sha1_digest_to_str(their_id->sha1, old_hashstr,
431 		    sizeof(old_hashstr));
432 		got_sha1_digest_to_str(zero_id, new_hashstr,
433 		    sizeof(new_hashstr));
434 		err = describe_refchange(&n, &sent_my_capabilites,
435 		    my_capabilities, buf, sizeof(buf), refname,
436 		    old_hashstr, new_hashstr);
437 		if (err)
438 			goto done;
439 		err = got_pkt_writepkt(fd, buf, n, chattygot);
440 		if (err)
441 			goto done;
442 		if (chattygot) {
443 			fprintf(stderr, "%s: deleting %s %s\n",
444 			    getprogname(), refname, old_hashstr);
445 		}
446 		nsent++;
447 	}
448 
449 	TAILQ_FOREACH(pe, refs, entry) {
450 		const char *refname = pe->path;
451 		struct got_object_id *id = pe->data;
452 		struct got_object_id *their_id = NULL;
453 		struct got_pathlist_entry *their_pe;
454 
455 		TAILQ_FOREACH(their_pe, &their_refs, entry) {
456 			const char *their_refname = their_pe->path;
457 			if (got_path_cmp(refname, their_refname,
458 			    strlen(refname), strlen(their_refname)) == 0) {
459 				their_id = their_pe->data;
460 				break;
461 			}
462 		}
463 		if (their_id) {
464 			if (got_object_id_cmp(id, their_id) == 0) {
465 				if (chattygot) {
466 					fprintf(stderr,
467 					    "%s: no change for %s\n",
468 					    getprogname(), refname);
469 				}
470 				continue;
471 			}
472 			got_sha1_digest_to_str(their_id->sha1, old_hashstr,
473 			    sizeof(old_hashstr));
474 		} else {
475 			got_sha1_digest_to_str(zero_id, old_hashstr,
476 			    sizeof(old_hashstr));
477 		}
478 		got_sha1_digest_to_str(id->sha1, new_hashstr,
479 		    sizeof(new_hashstr));
480 		err = describe_refchange(&n, &sent_my_capabilites,
481 		    my_capabilities, buf, sizeof(buf), refname,
482 		    old_hashstr, new_hashstr);
483 		if (err)
484 			goto done;
485 		err = got_pkt_writepkt(fd, buf, n, chattygot);
486 		if (err)
487 			goto done;
488 		if (chattygot) {
489 			if (their_id) {
490 				fprintf(stderr, "%s: updating %s %s -> %s\n",
491 				    getprogname(), refname, old_hashstr,
492 				    new_hashstr);
493 			} else {
494 				fprintf(stderr, "%s: creating %s %s\n",
495 				    getprogname(), refname, new_hashstr);
496 			}
497 		}
498 		nsent++;
499 	}
500 	err = got_pkt_flushpkt(fd, chattygot);
501 	if (err)
502 		goto done;
503 
504 	err = send_pack_request(ibuf);
505 	if (err)
506 		goto done;
507 
508 	err = recv_packfd(&packfd, ibuf);
509 	if (err)
510 		goto done;
511 
512 	if (packfd != -1) {
513 		err = send_pack_file(fd, packfd, ibuf);
514 		if (err)
515 			goto done;
516 	}
517 
518 	err = got_pkt_readpkt(&n, fd, buf, sizeof(buf), chattygot);
519 	if (err)
520 		goto done;
521 	if (n >= 4 && strncmp(buf, "ERR ", 4) == 0) {
522 		err = send_error(&buf[4], n - 4);
523 		goto done;
524 	} else if (n < 10 || strncmp(buf, "unpack ok\n", 10) != 0) {
525 		err = got_error_msg(GOT_ERR_BAD_PACKET,
526 		    "unexpected message from server");
527 		goto done;
528 	}
529 
530 	while (nsent > 0) {
531 		err = got_pkt_readpkt(&n, fd, buf, sizeof(buf), chattygot);
532 		if (err)
533 			goto done;
534 		if (n < 3) {
535 			err = got_error_msg(GOT_ERR_BAD_PACKET,
536 			    "unexpected message from server");
537 			goto done;
538 		} else if (n >= 4 && strncmp(buf, "ERR ", 4) == 0) {
539 			err = send_error(&buf[4], n - 4);
540 			goto done;
541 		} else if (strncmp(buf, "ok ", 3) == 0) {
542 			err = send_ref_status(ibuf, buf + 3, 1,
543 			    refs, delete_refs);
544 			if (err)
545 				goto done;
546 		} else if (strncmp(buf, "ng ", 3) == 0) {
547 			err = send_ref_status(ibuf, buf + 3, 0,
548 			    refs, delete_refs);
549 			if (err)
550 				goto done;
551 		} else {
552 			err = got_error_msg(GOT_ERR_BAD_PACKET,
553 			    "unexpected message from server");
554 			goto done;
555 		}
556 		nsent--;
557 	}
558 
559 	err = send_done(ibuf);
560 done:
561 	TAILQ_FOREACH(pe, &their_refs, entry) {
562 		free((void *)pe->path);
563 		free(pe->data);
564 	}
565 	got_pathlist_free(&their_refs);
566 	free(id_str);
567 	free(id);
568 	free(refname);
569 	free(server_capabilities);
570 	return err;
571 }
572 
573 int
574 main(int argc, char **argv)
575 {
576 	const struct got_error *err = NULL;
577 	int sendfd;
578 	struct imsgbuf ibuf;
579 	struct imsg imsg;
580 	struct got_pathlist_head refs;
581 	struct got_pathlist_head delete_refs;
582 	struct got_pathlist_entry *pe;
583 	struct got_imsg_send_request send_req;
584 	struct got_imsg_send_ref href;
585 	size_t datalen, i;
586 #if 0
587 	static int attached;
588 	while (!attached)
589 		sleep (1);
590 #endif
591 
592 	TAILQ_INIT(&refs);
593 	TAILQ_INIT(&delete_refs);
594 
595 	imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
596 #ifndef PROFILE
597 	/* revoke access to most system calls */
598 	if (pledge("stdio recvfd", NULL) == -1) {
599 		err = got_error_from_errno("pledge");
600 		got_privsep_send_error(&ibuf, err);
601 		return 1;
602 	}
603 
604 	/* revoke fs access */
605 	if (landlock_no_fs() == -1) {
606 		err = got_error_from_errno("landlock_no_fs");
607 		got_privsep_send_error(&ibuf, err);
608 		return 1;
609 	}
610 	if (cap_enter() == -1) {
611 		err = got_error_from_errno("cap_enter");
612 		got_privsep_send_error(&ibuf, err);
613 		return 1;
614 	}
615 #endif
616 	if ((err = got_privsep_recv_imsg(&imsg, &ibuf, 0)) != 0) {
617 		if (err->code == GOT_ERR_PRIVSEP_PIPE)
618 			err = NULL;
619 		goto done;
620 	}
621 	if (imsg.hdr.type == GOT_IMSG_STOP)
622 		goto done;
623 	if (imsg.hdr.type != GOT_IMSG_SEND_REQUEST) {
624 		err = got_error(GOT_ERR_PRIVSEP_MSG);
625 		goto done;
626 	}
627 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
628 	if (datalen < sizeof(send_req)) {
629 		err = got_error(GOT_ERR_PRIVSEP_LEN);
630 		goto done;
631 	}
632 	memcpy(&send_req, imsg.data, sizeof(send_req));
633 	sendfd = imsg.fd;
634 	imsg_free(&imsg);
635 
636 	if (send_req.verbosity > 0)
637 		chattygot += send_req.verbosity;
638 
639 	for (i = 0; i < send_req.nrefs; i++) {
640 		struct got_object_id *id;
641 		char *refname;
642 
643 		if ((err = got_privsep_recv_imsg(&imsg, &ibuf, 0)) != 0) {
644 			if (err->code == GOT_ERR_PRIVSEP_PIPE)
645 				err = NULL;
646 			goto done;
647 		}
648 		if (imsg.hdr.type == GOT_IMSG_STOP)
649 			goto done;
650 		if (imsg.hdr.type != GOT_IMSG_SEND_REF) {
651 			err = got_error(GOT_ERR_PRIVSEP_MSG);
652 			goto done;
653 		}
654 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
655 		if (datalen < sizeof(href)) {
656 			err = got_error(GOT_ERR_PRIVSEP_LEN);
657 			goto done;
658 		}
659 		memcpy(&href, imsg.data, sizeof(href));
660 		if (datalen - sizeof(href) < href.name_len) {
661 			err = got_error(GOT_ERR_PRIVSEP_LEN);
662 			goto done;
663 		}
664 		refname = malloc(href.name_len + 1);
665 		if (refname == NULL) {
666 			err = got_error_from_errno("malloc");
667 			goto done;
668 		}
669 		memcpy(refname, imsg.data + sizeof(href), href.name_len);
670 		refname[href.name_len] = '\0';
671 
672 		/*
673 		 * Prevent sending of references that won't make any
674 		 * sense outside the local repository's context.
675 		 */
676 		if (strncmp(refname, "refs/got/", 9) == 0 ||
677 		    strncmp(refname, "refs/remotes/", 13) == 0) {
678 			err = got_error_fmt(GOT_ERR_SEND_BAD_REF,
679 			    "%s", refname);
680 			goto done;
681 		}
682 
683 		id = malloc(sizeof(*id));
684 		if (id == NULL) {
685 			free(refname);
686 			err = got_error_from_errno("malloc");
687 			goto done;
688 		}
689 		memcpy(id->sha1, href.id, SHA1_DIGEST_LENGTH);
690 		if (href.delete)
691 			err = got_pathlist_append(&delete_refs, refname, id);
692 		else
693 			err = got_pathlist_append(&refs, refname, id);
694 		if (err) {
695 			free(refname);
696 			free(id);
697 			goto done;
698 		}
699 
700 		imsg_free(&imsg);
701 	}
702 
703 	err = send_pack(sendfd, &refs, &delete_refs, &ibuf);
704 done:
705 	TAILQ_FOREACH(pe, &refs, entry) {
706 		free((char *)pe->path);
707 		free(pe->data);
708 	}
709 	got_pathlist_free(&refs);
710 	TAILQ_FOREACH(pe, &delete_refs, entry) {
711 		free((char *)pe->path);
712 		free(pe->data);
713 	}
714 	got_pathlist_free(&delete_refs);
715 	if (sendfd != -1 && close(sendfd) == -1 && err == NULL)
716 		err = got_error_from_errno("close");
717 	if (err != NULL && err->code != GOT_ERR_CANCELLED)  {
718 		fprintf(stderr, "%s: %s\n", getprogname(), err->msg);
719 		got_privsep_send_error(&ibuf, err);
720 	}
721 
722 	exit(0);
723 }