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