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 <imsg.h>
27 #include <limits.h>
28 #include <poll.h>
29 #include <signal.h>
30 #include <stdio.h>
31 #include <stdlib.h>
32 #include <string.h>
33 #include <ctype.h>
34 #include <sha1.h>
35 #include <sha2.h>
36 #include <fcntl.h>
37 #include <unistd.h>
38 #include <zlib.h>
39 #include <err.h>
40 
41 #include "got_error.h"
42 #include "got_object.h"
43 #include "got_path.h"
44 #include "got_version.h"
45 #include "got_fetch.h"
46 #include "got_reference.h"
47 
48 #include "got_lib_hash.h"
49 #include "got_lib_delta.h"
50 #include "got_lib_object.h"
51 #include "got_lib_object_parse.h"
52 #include "got_lib_privsep.h"
53 #include "got_lib_pack.h"
54 #include "got_lib_pkt.h"
55 #include "got_lib_gitproto.h"
56 #include "got_lib_ratelimit.h"
57 #include "got_lib_poll.h"
58 
59 #ifndef nitems
60 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
61 #endif
62 
63 struct got_object *indexed;
64 static int chattygot;
65 
66 static const struct got_capability got_capabilities[] = {
67 	{ GOT_CAPA_AGENT, "got/" GOT_VERSION_STR },
68 	{ GOT_CAPA_OFS_DELTA, NULL },
69 #if 0
70 	{ GOT_CAPA_SIDE_BAND_64K, NULL },
71 #endif
72 	{ GOT_CAPA_REPORT_STATUS, NULL },
73 	{ GOT_CAPA_DELETE_REFS, NULL },
74 };
75 
76 static const struct got_error *
77 send_upload_progress(struct imsgbuf *ibuf, off_t bytes,
78     struct got_ratelimit *rl)
79 {
80 	const struct got_error *err = NULL;
81 	int elapsed = 0;
82 
83 	if (rl) {
84 		err = got_ratelimit_check(&elapsed, rl);
85 		if (err || !elapsed)
86 			return err;
87 	}
88 
89 	if (imsg_compose(ibuf, GOT_IMSG_SEND_UPLOAD_PROGRESS, 0, 0, -1,
90 	    &bytes, sizeof(bytes)) == -1)
91 		return got_error_from_errno(
92 		    "imsg_compose SEND_UPLOAD_PROGRESS");
93 
94 	return got_privsep_flush_imsg(ibuf);
95 }
96 
97 static const struct got_error *
98 send_pack_request(struct imsgbuf *ibuf)
99 {
100 	if (imsg_compose(ibuf, GOT_IMSG_SEND_PACK_REQUEST, 0, 0, -1,
101 	    NULL, 0) == -1)
102 		return got_error_from_errno("imsg_compose SEND_PACK_REQUEST");
103 	return got_privsep_flush_imsg(ibuf);
104 }
105 
106 static const struct got_error *
107 send_done(struct imsgbuf *ibuf)
108 {
109 	if (imsg_compose(ibuf, GOT_IMSG_SEND_DONE, 0, 0, -1, NULL, 0) == -1)
110 		return got_error_from_errno("imsg_compose SEND_DONE");
111 	return got_privsep_flush_imsg(ibuf);
112 }
113 
114 static const struct got_error *
115 recv_packfd(int *packfd, struct imsgbuf *ibuf)
116 {
117 	const struct got_error *err;
118 	struct imsg imsg;
119 
120 	*packfd = -1;
121 
122 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
123 	if (err)
124 		return err;
125 
126 	if (imsg.hdr.type == GOT_IMSG_STOP) {
127 		err = got_error(GOT_ERR_CANCELLED);
128 		goto done;
129 	}
130 
131 	if (imsg.hdr.type != GOT_IMSG_SEND_PACKFD) {
132 		err = got_error(GOT_ERR_PRIVSEP_MSG);
133 		goto done;
134 	}
135 
136 	if (imsg.hdr.len - IMSG_HEADER_SIZE != 0) {
137 		err = got_error(GOT_ERR_PRIVSEP_LEN);
138 		goto done;
139 	}
140 
141 	*packfd = imsg_get_fd(&imsg);
142 done:
143 	imsg_free(&imsg);
144 	return err;
145 }
146 
147 static const struct got_error *
148 send_pack_file(int sendfd, int packfd, struct imsgbuf *ibuf)
149 {
150 	const struct got_error *err;
151 	unsigned char buf[8192];
152 	ssize_t r;
153 	off_t wtotal = 0;
154 	struct got_ratelimit rl;
155 
156 	if (lseek(packfd, 0L, SEEK_SET) == -1)
157 		return got_error_from_errno("lseek");
158 
159 	got_ratelimit_init(&rl, 0, 500);
160 
161 	for (;;) {
162 		r = read(packfd, buf, sizeof(buf));
163 		if (r == -1)
164 			return got_error_from_errno("read");
165 		if (r == 0)
166 			break;
167 		err = got_poll_write_full(sendfd, buf, r);
168 		if (err)
169 			return NULL;
170 		wtotal += r;
171 		err = send_upload_progress(ibuf, wtotal, &rl);
172 		if (err)
173 			return err;
174 	}
175 
176 	return send_upload_progress(ibuf, wtotal, NULL);
177 }
178 
179 static const struct got_error *
180 send_error(const char *buf, size_t len)
181 {
182 	static char msg[1024];
183 	size_t i;
184 
185 	for (i = 0; i < len && i < sizeof(msg) - 1; i++) {
186 		if (!isprint((unsigned char)buf[i]))
187 			return got_error_msg(GOT_ERR_BAD_PACKET,
188 			    "non-printable error message received from server");
189 		msg[i] = buf[i];
190 	}
191 	msg[i] = '\0';
192 	return got_error_msg(GOT_ERR_SEND_FAILED, msg);
193 }
194 
195 static const struct got_error *
196 send_their_ref(struct imsgbuf *ibuf, struct got_object_id *refid,
197     const char *refname)
198 {
199 	struct ibuf *wbuf;
200 	size_t len, reflen = strlen(refname);
201 
202 	len = sizeof(struct got_imsg_send_remote_ref) + reflen;
203 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE)
204 		return got_error(GOT_ERR_NO_SPACE);
205 
206 	wbuf = imsg_create(ibuf, GOT_IMSG_SEND_REMOTE_REF, 0, 0, len);
207 	if (wbuf == NULL)
208 		return got_error_from_errno("imsg_create SEND_REMOTE_REF");
209 
210 	/* Keep in sync with struct got_imsg_send_remote_ref definition! */
211 	if (imsg_add(wbuf, refid, sizeof(*refid)) == -1)
212 		return got_error_from_errno("imsg_add SEND_REMOTE_REF");
213 	if (imsg_add(wbuf, &reflen, sizeof(reflen)) == -1)
214 		return got_error_from_errno("imsg_add SEND_REMOTE_REF");
215 	if (imsg_add(wbuf, refname, reflen) == -1)
216 		return got_error_from_errno("imsg_add SEND_REMOTE_REF");
217 
218 	imsg_close(ibuf, wbuf);
219 	return got_privsep_flush_imsg(ibuf);
220 }
221 
222 static const struct got_error *
223 send_ref_status(struct imsgbuf *ibuf, const char *refname, int success,
224     struct got_pathlist_head *refs, struct got_pathlist_head *delete_refs)
225 {
226 	struct ibuf *wbuf;
227 	size_t i, len, reflen, errmsglen = 0;
228 	struct got_pathlist_entry *pe;
229 	int ref_valid = 0;
230 	char *eol, *sp;
231 	const char *errmsg = "";
232 
233 	eol = strchr(refname, '\n');
234 	if (eol == NULL) {
235 		return got_error_msg(GOT_ERR_BAD_PACKET,
236 		    "unexpected message from server");
237 	}
238 	*eol = '\0';
239 
240 	sp = strchr(refname, ' ');
241 	if (sp != NULL) {
242 		*sp++ = '\0';
243 		errmsg = sp;
244 		errmsglen = strlen(errmsg);
245 
246 		for (i = 0; i < errmsglen; ++i) {
247 			if (!isprint((unsigned char)errmsg[i])) {
248 				return got_error_msg(GOT_ERR_BAD_PACKET,
249 				    "non-printable error message received "
250 				    "from the server");
251 			}
252 		}
253 	}
254 
255 	reflen = strlen(refname);
256 	if (!got_ref_name_is_valid(refname)) {
257 		return got_error_msg(GOT_ERR_BAD_PACKET,
258 		    "unexpected message from server");
259 	}
260 
261 	TAILQ_FOREACH(pe, refs, entry) {
262 		if (strcmp(refname, pe->path) == 0) {
263 			ref_valid = 1;
264 			break;
265 		}
266 	}
267 	if (!ref_valid) {
268 		TAILQ_FOREACH(pe, delete_refs, entry) {
269 			if (strcmp(refname, pe->path) == 0) {
270 				ref_valid = 1;
271 				break;
272 			}
273 		}
274 	}
275 	if (!ref_valid) {
276 		return got_error_msg(GOT_ERR_BAD_PACKET,
277 		    "unexpected message from server");
278 	}
279 
280 	len = sizeof(struct got_imsg_send_ref_status) + reflen + errmsglen;
281 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE)
282 		return got_error(GOT_ERR_NO_SPACE);
283 
284 	wbuf = imsg_create(ibuf, GOT_IMSG_SEND_REF_STATUS,
285 	    0, 0, len);
286 	if (wbuf == NULL)
287 		return got_error_from_errno("imsg_create SEND_REF_STATUS");
288 
289 	/* Keep in sync with struct got_imsg_send_ref_status definition! */
290 	if (imsg_add(wbuf, &success, sizeof(success)) == -1)
291 		return got_error_from_errno("imsg_add SEND_REF_STATUS");
292 	if (imsg_add(wbuf, &reflen, sizeof(reflen)) == -1)
293 		return got_error_from_errno("imsg_add SEND_REF_STATUS");
294 	if (imsg_add(wbuf, &errmsglen, sizeof(errmsglen)) == -1)
295 		return got_error_from_errno("imsg_add SEND_REF_STATUS");
296 	if (imsg_add(wbuf, refname, reflen) == -1)
297 		return got_error_from_errno("imsg_add SEND_REF_STATUS");
298 	if (imsg_add(wbuf, errmsg, errmsglen) == -1)
299 		return got_error_from_errno("imsg_add SEND_REF_STATUS");
300 
301 	imsg_close(ibuf, wbuf);
302 	return got_privsep_flush_imsg(ibuf);
303 }
304 
305 static const struct got_error *
306 describe_refchange(int *n, int *sent_my_capabilites,
307     const char *my_capabilities, char *buf, size_t bufsize,
308     const char *refname, const char *old_hashstr, const char *new_hashstr)
309 {
310 	*n = snprintf(buf, bufsize, "%s %s %s",
311 	    old_hashstr, new_hashstr, refname);
312 	if (*n < 0 || (size_t)*n >= bufsize)
313 		return got_error(GOT_ERR_NO_SPACE);
314 
315 	/*
316 	 * We must announce our capabilities along with the first
317 	 * reference. Unfortunately, the protocol requires an embedded
318 	 * NUL as a separator between reference name and capabilities,
319 	 * which we have to deal with here.
320 	 * It also requires a linefeed for terminating packet data.
321 	 */
322 	if (!*sent_my_capabilites && my_capabilities != NULL) {
323 		int m;
324 		if (*n >= bufsize - 1)
325 			return got_error(GOT_ERR_NO_SPACE);
326 		m = snprintf(buf + *n + 1, /* offset after '\0' */
327 		    bufsize - (*n + 1), "%s\n", my_capabilities);
328 		if (m < 0 || *n + m >= bufsize)
329 			return got_error(GOT_ERR_NO_SPACE);
330 		*n += m;
331 		*sent_my_capabilites = 1;
332 	} else {
333 		*n = strlcat(buf, "\n", bufsize);
334 		if (*n >= bufsize)
335 			return got_error(GOT_ERR_NO_SPACE);
336 	}
337 
338 	return NULL;
339 }
340 
341 static const struct got_error *
342 send_pack(int fd, struct got_pathlist_head *refs,
343     struct got_pathlist_head *delete_refs, struct imsgbuf *ibuf)
344 {
345 	const struct got_error *err = NULL;
346 	char buf[GOT_PKT_MAX];
347 	const unsigned char zero_id[SHA1_DIGEST_LENGTH] = { 0 };
348 	char old_hashstr[SHA1_DIGEST_STRING_LENGTH];
349 	char new_hashstr[SHA1_DIGEST_STRING_LENGTH];
350 	struct got_pathlist_head their_refs;
351 	int is_firstpkt = 1;
352 	int n, nsent = 0;
353 	int packfd = -1;
354 	char *id_str = NULL, *refname = NULL;
355 	struct got_object_id *id = NULL;
356 	char *server_capabilities = NULL, *my_capabilities = NULL;
357 	struct got_pathlist_entry *pe;
358 	int sent_my_capabilites = 0;
359 
360 	TAILQ_INIT(&their_refs);
361 
362 	if (TAILQ_EMPTY(refs) && TAILQ_EMPTY(delete_refs))
363 		return got_error(GOT_ERR_SEND_EMPTY);
364 
365 	while (1) {
366 		err = got_pkt_readpkt(&n, fd, buf, sizeof(buf), chattygot,
367 		    INFTIM);
368 		if (err)
369 			goto done;
370 		if (n == 0)
371 			break;
372 		if (n >= 4 && strncmp(buf, "ERR ", 4) == 0) {
373 			err = send_error(&buf[4], n - 4);
374 			goto done;
375 		}
376 		free(id_str);
377 		free(refname);
378 		err = got_gitproto_parse_refline(&id_str, &refname,
379 		    &server_capabilities, buf, n);
380 		if (err)
381 			goto done;
382 		if (is_firstpkt) {
383 			if (server_capabilities == NULL) {
384 				server_capabilities = strdup("");
385 				if (server_capabilities == NULL) {
386 					err = got_error_from_errno("strdup");
387 					goto done;
388 				}
389 			}
390 			if (chattygot && server_capabilities[0] != '\0')
391 				fprintf(stderr, "%s: server capabilities: %s\n",
392 				    getprogname(), server_capabilities);
393 			err = got_gitproto_match_capabilities(&my_capabilities,
394 			    NULL, server_capabilities, got_capabilities,
395 			    nitems(got_capabilities));
396 			if (err)
397 				goto done;
398 			if (chattygot)
399 				fprintf(stderr, "%s: my capabilities:%s\n",
400 				    getprogname(),
401 				    my_capabilities ? my_capabilities : "");
402 			is_firstpkt = 0;
403 		}
404 		if (strstr(refname, "^{}")) {
405 			if (chattygot) {
406 				fprintf(stderr, "%s: ignoring %s\n",
407 				    getprogname(), refname);
408 			}
409 			continue;
410 		}
411 
412 		id = malloc(sizeof(*id));
413 		if (id == NULL) {
414 			err = got_error_from_errno("malloc");
415 			goto done;
416 		}
417 		if (!got_parse_object_id(id, id_str, GOT_HASH_SHA1)) {
418 			err = got_error(GOT_ERR_BAD_OBJ_ID_STR);
419 			goto done;
420 		}
421 		err = send_their_ref(ibuf, id, refname);
422 		if (err)
423 			goto done;
424 
425 		err = got_pathlist_append(&their_refs, refname, id);
426 		if (err)
427 			goto done;
428 
429 		if (chattygot)
430 			fprintf(stderr, "%s: remote has %s %s\n",
431 			    getprogname(), refname, id_str);
432 		free(id_str);
433 		id_str = NULL;
434 		refname = NULL; /* do not free; owned by their_refs */
435 		id = NULL; /* do not free; owned by their_refs */
436 	}
437 
438 	if (!TAILQ_EMPTY(delete_refs)) {
439 		if (my_capabilities == NULL ||
440 		    strstr(my_capabilities, GOT_CAPA_DELETE_REFS) == NULL) {
441 			err = got_error(GOT_ERR_CAPA_DELETE_REFS);
442 			goto done;
443 		}
444 	}
445 
446 	TAILQ_FOREACH(pe, delete_refs, entry) {
447 		const char *refname = pe->path;
448 		struct got_pathlist_entry *their_pe;
449 		struct got_object_id *their_id = NULL;
450 
451 		TAILQ_FOREACH(their_pe, &their_refs, entry) {
452 			const char *their_refname = their_pe->path;
453 			if (got_path_cmp(refname, their_refname,
454 			    strlen(refname), strlen(their_refname)) == 0) {
455 				their_id = their_pe->data;
456 				break;
457 			}
458 		}
459 		if (their_id == NULL) {
460 			err = got_error_fmt(GOT_ERR_NOT_REF,
461 			    "%s does not exist in remote repository",
462 			    refname);
463 			goto done;
464 		}
465 
466 		got_object_id_hex(their_id, old_hashstr,
467 		    sizeof(old_hashstr));
468 		got_sha1_digest_to_str(zero_id, new_hashstr,
469 		    sizeof(new_hashstr));
470 		err = describe_refchange(&n, &sent_my_capabilites,
471 		    my_capabilities, buf, sizeof(buf), refname,
472 		    old_hashstr, new_hashstr);
473 		if (err)
474 			goto done;
475 		err = got_pkt_writepkt(fd, buf, n, chattygot);
476 		if (err)
477 			goto done;
478 		if (chattygot) {
479 			fprintf(stderr, "%s: deleting %s %s\n",
480 			    getprogname(), refname, old_hashstr);
481 		}
482 		nsent++;
483 	}
484 
485 	TAILQ_FOREACH(pe, refs, entry) {
486 		const char *refname = pe->path;
487 		struct got_object_id *id = pe->data;
488 		struct got_object_id *their_id = NULL;
489 		struct got_pathlist_entry *their_pe;
490 
491 		TAILQ_FOREACH(their_pe, &their_refs, entry) {
492 			const char *their_refname = their_pe->path;
493 			if (got_path_cmp(refname, their_refname,
494 			    strlen(refname), strlen(their_refname)) == 0) {
495 				their_id = their_pe->data;
496 				break;
497 			}
498 		}
499 		if (their_id) {
500 			if (got_object_id_cmp(id, their_id) == 0) {
501 				if (chattygot) {
502 					fprintf(stderr,
503 					    "%s: no change for %s\n",
504 					    getprogname(), refname);
505 				}
506 				continue;
507 			}
508 			got_object_id_hex(their_id, old_hashstr,
509 			    sizeof(old_hashstr));
510 		} else {
511 			got_sha1_digest_to_str(zero_id, old_hashstr,
512 			    sizeof(old_hashstr));
513 		}
514 		got_object_id_hex(id, new_hashstr, sizeof(new_hashstr));
515 		err = describe_refchange(&n, &sent_my_capabilites,
516 		    my_capabilities, buf, sizeof(buf), refname,
517 		    old_hashstr, new_hashstr);
518 		if (err)
519 			goto done;
520 		err = got_pkt_writepkt(fd, buf, n, chattygot);
521 		if (err)
522 			goto done;
523 		if (chattygot) {
524 			if (their_id) {
525 				fprintf(stderr, "%s: updating %s %s -> %s\n",
526 				    getprogname(), refname, old_hashstr,
527 				    new_hashstr);
528 			} else {
529 				fprintf(stderr, "%s: creating %s %s\n",
530 				    getprogname(), refname, new_hashstr);
531 			}
532 		}
533 		nsent++;
534 	}
535 	err = got_pkt_flushpkt(fd, chattygot);
536 	if (err)
537 		goto done;
538 
539 	err = send_pack_request(ibuf);
540 	if (err)
541 		goto done;
542 
543 	err = recv_packfd(&packfd, ibuf);
544 	if (err)
545 		goto done;
546 
547 	if (packfd != -1) {
548 		err = send_pack_file(fd, packfd, ibuf);
549 		if (err)
550 			goto done;
551 	}
552 
553 	err = got_pkt_readpkt(&n, fd, buf, sizeof(buf), chattygot, INFTIM);
554 	if (err)
555 		goto done;
556 	if (n >= 4 && strncmp(buf, "ERR ", 4) == 0) {
557 		err = send_error(&buf[4], n - 4);
558 		goto done;
559 	} else if (n < 10 || strncmp(buf, "unpack ok\n", 10) != 0) {
560 		err = got_error_msg(GOT_ERR_BAD_PACKET,
561 		    "unexpected message from server");
562 		goto done;
563 	}
564 
565 	while (nsent > 0) {
566 		err = got_pkt_readpkt(&n, fd, buf, sizeof(buf), chattygot,
567 		    INFTIM);
568 		if (err)
569 			goto done;
570 		if (n < 3) {
571 			err = got_error_msg(GOT_ERR_BAD_PACKET,
572 			    "unexpected message from server");
573 			goto done;
574 		} else if (n >= 4 && strncmp(buf, "ERR ", 4) == 0) {
575 			err = send_error(&buf[4], n - 4);
576 			goto done;
577 		} else if (strncmp(buf, "ok ", 3) == 0) {
578 			err = send_ref_status(ibuf, buf + 3, 1,
579 			    refs, delete_refs);
580 			if (err)
581 				goto done;
582 		} else if (strncmp(buf, "ng ", 3) == 0) {
583 			err = send_ref_status(ibuf, buf + 3, 0,
584 			    refs, delete_refs);
585 			if (err)
586 				goto done;
587 		} else {
588 			err = got_error_msg(GOT_ERR_BAD_PACKET,
589 			    "unexpected message from server");
590 			goto done;
591 		}
592 		nsent--;
593 	}
594 
595 	err = send_done(ibuf);
596 done:
597 	got_pathlist_free(&their_refs, GOT_PATHLIST_FREE_ALL);
598 	free(id_str);
599 	free(id);
600 	free(refname);
601 	free(server_capabilities);
602 	return err;
603 }
604 
605 int
606 main(int argc, char **argv)
607 {
608 	const struct got_error *err = NULL;
609 	int sendfd = -1;
610 	struct imsgbuf ibuf;
611 	struct imsg imsg;
612 	struct got_pathlist_head refs;
613 	struct got_pathlist_head delete_refs;
614 	struct got_imsg_send_request send_req;
615 	struct got_imsg_send_ref href;
616 	size_t datalen, i;
617 #if 0
618 	static int attached;
619 	while (!attached)
620 		sleep (1);
621 #endif
622 
623 	TAILQ_INIT(&refs);
624 	TAILQ_INIT(&delete_refs);
625 
626 	imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
627 #ifndef PROFILE
628 	/* revoke access to most system calls */
629 	if (pledge("stdio recvfd", NULL) == -1) {
630 		err = got_error_from_errno("pledge");
631 		got_privsep_send_error(&ibuf, err);
632 		return 1;
633 	}
634 #endif
635 	if ((err = got_privsep_recv_imsg(&imsg, &ibuf, 0)) != 0) {
636 		if (err->code == GOT_ERR_PRIVSEP_PIPE)
637 			err = NULL;
638 		goto done;
639 	}
640 	if (imsg.hdr.type == GOT_IMSG_STOP)
641 		goto done;
642 	if (imsg.hdr.type != GOT_IMSG_SEND_REQUEST) {
643 		err = got_error(GOT_ERR_PRIVSEP_MSG);
644 		goto done;
645 	}
646 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
647 	if (datalen < sizeof(send_req)) {
648 		err = got_error(GOT_ERR_PRIVSEP_LEN);
649 		goto done;
650 	}
651 	memcpy(&send_req, imsg.data, sizeof(send_req));
652 	sendfd = imsg_get_fd(&imsg);
653 	imsg_free(&imsg);
654 
655 	if (send_req.verbosity > 0)
656 		chattygot += send_req.verbosity;
657 
658 	for (i = 0; i < send_req.nrefs; i++) {
659 		struct got_object_id *id;
660 		char *refname;
661 
662 		if ((err = got_privsep_recv_imsg(&imsg, &ibuf, 0)) != 0) {
663 			if (err->code == GOT_ERR_PRIVSEP_PIPE)
664 				err = NULL;
665 			goto done;
666 		}
667 		if (imsg.hdr.type == GOT_IMSG_STOP)
668 			goto done;
669 		if (imsg.hdr.type != GOT_IMSG_SEND_REF) {
670 			err = got_error(GOT_ERR_PRIVSEP_MSG);
671 			goto done;
672 		}
673 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
674 		if (datalen < sizeof(href)) {
675 			err = got_error(GOT_ERR_PRIVSEP_LEN);
676 			goto done;
677 		}
678 		memcpy(&href, imsg.data, sizeof(href));
679 		if (datalen - sizeof(href) < href.name_len) {
680 			err = got_error(GOT_ERR_PRIVSEP_LEN);
681 			goto done;
682 		}
683 		refname = malloc(href.name_len + 1);
684 		if (refname == NULL) {
685 			err = got_error_from_errno("malloc");
686 			goto done;
687 		}
688 		memcpy(refname, imsg.data + sizeof(href), href.name_len);
689 		refname[href.name_len] = '\0';
690 
691 		/*
692 		 * Prevent sending of references that won't make any
693 		 * sense outside the local repository's context.
694 		 */
695 		if (strncmp(refname, "refs/got/", 9) == 0 ||
696 		    strncmp(refname, "refs/remotes/", 13) == 0) {
697 			err = got_error_fmt(GOT_ERR_SEND_BAD_REF,
698 			    "%s", refname);
699 			goto done;
700 		}
701 
702 		id = malloc(sizeof(*id));
703 		if (id == NULL) {
704 			free(refname);
705 			err = got_error_from_errno("malloc");
706 			goto done;
707 		}
708 		memcpy(id, &href.id, sizeof(*id));
709 		if (href.delete)
710 			err = got_pathlist_append(&delete_refs, refname, id);
711 		else
712 			err = got_pathlist_append(&refs, refname, id);
713 		if (err) {
714 			free(refname);
715 			free(id);
716 			goto done;
717 		}
718 
719 		imsg_free(&imsg);
720 	}
721 
722 	err = send_pack(sendfd, &refs, &delete_refs, &ibuf);
723 done:
724 	got_pathlist_free(&refs, GOT_PATHLIST_FREE_ALL);
725 	got_pathlist_free(&delete_refs, GOT_PATHLIST_FREE_ALL);
726 	if (sendfd != -1 && close(sendfd) == -1 && err == NULL)
727 		err = got_error_from_errno("close");
728 	if (err != NULL && err->code != GOT_ERR_CANCELLED)  {
729 		fprintf(stderr, "%s: %s\n", getprogname(), err->msg);
730 		got_privsep_send_error(&ibuf, err);
731 	}
732 
733 	exit(0);
734 }