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_compat.h"
38 #include "got_error.h"
39 #include "got_object.h"
40 #include "got_path.h"
41 #include "got_version.h"
42 #include "got_fetch.h"
43 #include "got_reference.h"
44 
45 #include "got_lib_hash.h"
46 #include "got_lib_delta.h"
47 #include "got_lib_object.h"
48 #include "got_lib_object_parse.h"
49 #include "got_lib_privsep.h"
50 #include "got_lib_pack.h"
51 #include "got_lib_pkt.h"
52 #include "got_lib_gitproto.h"
53 #include "got_lib_ratelimit.h"
54 #include "got_lib_poll.h"
55 
56 #ifndef nitems
57 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
58 #endif
59 
60 struct got_object *indexed;
61 static int chattygot;
62 
63 static const struct got_capability got_capabilities[] = {
64 	{ GOT_CAPA_AGENT, "got/" GOT_VERSION_STR },
65 	{ GOT_CAPA_OFS_DELTA, NULL },
66 #if 0
67 	{ GOT_CAPA_SIDE_BAND_64K, NULL },
68 #endif
69 	{ GOT_CAPA_REPORT_STATUS, NULL },
70 	{ GOT_CAPA_DELETE_REFS, NULL },
71 };
72 
73 static const struct got_error *
74 send_upload_progress(struct imsgbuf *ibuf, off_t bytes,
75     struct got_ratelimit *rl)
76 {
77 	const struct got_error *err = NULL;
78 	int elapsed = 0;
79 
80 	if (rl) {
81 		err = got_ratelimit_check(&elapsed, rl);
82 		if (err || !elapsed)
83 			return err;
84 	}
85 
86 	if (imsg_compose(ibuf, GOT_IMSG_SEND_UPLOAD_PROGRESS, 0, 0, -1,
87 	    &bytes, sizeof(bytes)) == -1)
88 		return got_error_from_errno(
89 		    "imsg_compose SEND_UPLOAD_PROGRESS");
90 
91 	return got_privsep_flush_imsg(ibuf);
92 }
93 
94 static const struct got_error *
95 send_pack_request(struct imsgbuf *ibuf)
96 {
97 	if (imsg_compose(ibuf, GOT_IMSG_SEND_PACK_REQUEST, 0, 0, -1,
98 	    NULL, 0) == -1)
99 		return got_error_from_errno("imsg_compose SEND_PACK_REQUEST");
100 	return got_privsep_flush_imsg(ibuf);
101 }
102 
103 static const struct got_error *
104 send_done(struct imsgbuf *ibuf)
105 {
106 	if (imsg_compose(ibuf, GOT_IMSG_SEND_DONE, 0, 0, -1, NULL, 0) == -1)
107 		return got_error_from_errno("imsg_compose SEND_DONE");
108 	return got_privsep_flush_imsg(ibuf);
109 }
110 
111 static const struct got_error *
112 recv_packfd(int *packfd, struct imsgbuf *ibuf)
113 {
114 	const struct got_error *err;
115 	struct imsg imsg;
116 
117 	*packfd = -1;
118 
119 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
120 	if (err)
121 		return err;
122 
123 	if (imsg.hdr.type == GOT_IMSG_STOP) {
124 		err = got_error(GOT_ERR_CANCELLED);
125 		goto done;
126 	}
127 
128 	if (imsg.hdr.type != GOT_IMSG_SEND_PACKFD) {
129 		err = got_error(GOT_ERR_PRIVSEP_MSG);
130 		goto done;
131 	}
132 
133 	if (imsg.hdr.len - IMSG_HEADER_SIZE != 0) {
134 		err = got_error(GOT_ERR_PRIVSEP_LEN);
135 		goto done;
136 	}
137 
138 	*packfd = imsg.fd;
139 done:
140 	imsg_free(&imsg);
141 	return err;
142 }
143 
144 static const struct got_error *
145 send_pack_file(int sendfd, int packfd, struct imsgbuf *ibuf)
146 {
147 	const struct got_error *err;
148 	unsigned char buf[8192];
149 	ssize_t r;
150 	off_t wtotal = 0;
151 	struct got_ratelimit rl;
152 
153 	if (lseek(packfd, 0L, SEEK_SET) == -1)
154 		return got_error_from_errno("lseek");
155 
156 	got_ratelimit_init(&rl, 0, 500);
157 
158 	for (;;) {
159 		r = read(packfd, buf, sizeof(buf));
160 		if (r == -1)
161 			return got_error_from_errno("read");
162 		if (r == 0)
163 			break;
164 		err = got_poll_write_full(sendfd, buf, r);
165 		if (err)
166 			return NULL;
167 		wtotal += r;
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((unsigned char)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, sizeof(*refid)) == -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 i, len, reflen, errmsglen = 0;
226 	struct got_pathlist_entry *pe;
227 	int ref_valid = 0;
228 	char *eol, *sp;
229 	const char *errmsg = "";
230 
231 	eol = strchr(refname, '\n');
232 	if (eol == NULL) {
233 		return got_error_msg(GOT_ERR_BAD_PACKET,
234 		    "unexpected message from server");
235 	}
236 	*eol = '\0';
237 
238 	sp = strchr(refname, ' ');
239 	if (sp != NULL) {
240 		*sp++ = '\0';
241 		errmsg = sp;
242 		errmsglen = strlen(errmsg);
243 
244 		for (i = 0; i < errmsglen; ++i) {
245 			if (!isprint((unsigned char)errmsg[i])) {
246 				return got_error_msg(GOT_ERR_BAD_PACKET,
247 				    "non-printable error message received "
248 				    "from the server");
249 			}
250 		}
251 	}
252 
253 	reflen = strlen(refname);
254 	if (!got_ref_name_is_valid(refname)) {
255 		return got_error_msg(GOT_ERR_BAD_PACKET,
256 		    "unexpected message from server");
257 	}
258 
259 	TAILQ_FOREACH(pe, refs, entry) {
260 		if (strcmp(refname, pe->path) == 0) {
261 			ref_valid = 1;
262 			break;
263 		}
264 	}
265 	if (!ref_valid) {
266 		TAILQ_FOREACH(pe, delete_refs, entry) {
267 			if (strcmp(refname, pe->path) == 0) {
268 				ref_valid = 1;
269 				break;
270 			}
271 		}
272 	}
273 	if (!ref_valid) {
274 		return got_error_msg(GOT_ERR_BAD_PACKET,
275 		    "unexpected message from server");
276 	}
277 
278 	len = sizeof(struct got_imsg_send_ref_status) + reflen + errmsglen;
279 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE)
280 		return got_error(GOT_ERR_NO_SPACE);
281 
282 	wbuf = imsg_create(ibuf, GOT_IMSG_SEND_REF_STATUS,
283 	    0, 0, len);
284 	if (wbuf == NULL)
285 		return got_error_from_errno("imsg_create SEND_REF_STATUS");
286 
287 	/* Keep in sync with struct got_imsg_send_ref_status definition! */
288 	if (imsg_add(wbuf, &success, sizeof(success)) == -1)
289 		return got_error_from_errno("imsg_add SEND_REF_STATUS");
290 	if (imsg_add(wbuf, &reflen, sizeof(reflen)) == -1)
291 		return got_error_from_errno("imsg_add SEND_REF_STATUS");
292 	if (imsg_add(wbuf, &errmsglen, sizeof(errmsglen)) == -1)
293 		return got_error_from_errno("imsg_add SEND_REF_STATUS");
294 	if (imsg_add(wbuf, refname, reflen) == -1)
295 		return got_error_from_errno("imsg_add SEND_REF_STATUS");
296 	if (imsg_add(wbuf, errmsg, errmsglen) == -1)
297 		return got_error_from_errno("imsg_add SEND_REF_STATUS");
298 
299 	wbuf->fd = -1;
300 	imsg_close(ibuf, wbuf);
301 	return got_privsep_flush_imsg(ibuf);
302 }
303 
304 static const struct got_error *
305 describe_refchange(int *n, int *sent_my_capabilites,
306     const char *my_capabilities, char *buf, size_t bufsize,
307     const char *refname, const char *old_hashstr, const char *new_hashstr)
308 {
309 	*n = snprintf(buf, bufsize, "%s %s %s",
310 	    old_hashstr, new_hashstr, refname);
311 	if (*n < 0 || (size_t)*n >= bufsize)
312 		return got_error(GOT_ERR_NO_SPACE);
313 
314 	/*
315 	 * We must announce our capabilities along with the first
316 	 * reference. Unfortunately, the protocol requires an embedded
317 	 * NUL as a separator between reference name and capabilities,
318 	 * which we have to deal with here.
319 	 * It also requires a linefeed for terminating packet data.
320 	 */
321 	if (!*sent_my_capabilites && my_capabilities != NULL) {
322 		int m;
323 		if (*n >= bufsize - 1)
324 			return got_error(GOT_ERR_NO_SPACE);
325 		m = snprintf(buf + *n + 1, /* offset after '\0' */
326 		    bufsize - (*n + 1), "%s\n", my_capabilities);
327 		if (m < 0 || *n + m >= bufsize)
328 			return got_error(GOT_ERR_NO_SPACE);
329 		*n += m;
330 		*sent_my_capabilites = 1;
331 	} else {
332 		*n = strlcat(buf, "\n", bufsize);
333 		if (*n >= bufsize)
334 			return got_error(GOT_ERR_NO_SPACE);
335 	}
336 
337 	return NULL;
338 }
339 
340 static const struct got_error *
341 send_pack(int fd, struct got_pathlist_head *refs,
342     struct got_pathlist_head *delete_refs, struct imsgbuf *ibuf)
343 {
344 	const struct got_error *err = NULL;
345 	char buf[GOT_PKT_MAX];
346 	const unsigned char zero_id[SHA1_DIGEST_LENGTH] = { 0 };
347 	char old_hashstr[SHA1_DIGEST_STRING_LENGTH];
348 	char new_hashstr[SHA1_DIGEST_STRING_LENGTH];
349 	struct got_pathlist_head their_refs;
350 	int is_firstpkt = 1;
351 	int n, nsent = 0;
352 	int packfd = -1;
353 	char *id_str = NULL, *refname = NULL;
354 	struct got_object_id *id = NULL;
355 	char *server_capabilities = NULL, *my_capabilities = NULL;
356 	struct got_pathlist_entry *pe;
357 	int sent_my_capabilites = 0;
358 
359 	TAILQ_INIT(&their_refs);
360 
361 	if (TAILQ_EMPTY(refs) && TAILQ_EMPTY(delete_refs))
362 		return got_error(GOT_ERR_SEND_EMPTY);
363 
364 	while (1) {
365 		err = got_pkt_readpkt(&n, fd, buf, sizeof(buf), chattygot);
366 		if (err)
367 			goto done;
368 		if (n == 0)
369 			break;
370 		if (n >= 4 && strncmp(buf, "ERR ", 4) == 0) {
371 			err = send_error(&buf[4], n - 4);
372 			goto done;
373 		}
374 		free(id_str);
375 		free(refname);
376 		err = got_gitproto_parse_refline(&id_str, &refname,
377 		    &server_capabilities, buf, n);
378 		if (err)
379 			goto done;
380 		if (is_firstpkt) {
381 			if (server_capabilities == NULL) {
382 				server_capabilities = strdup("");
383 				if (server_capabilities == NULL) {
384 					err = got_error_from_errno("strdup");
385 					goto done;
386 				}
387 			}
388 			if (chattygot && server_capabilities[0] != '\0')
389 				fprintf(stderr, "%s: server capabilities: %s\n",
390 				    getprogname(), server_capabilities);
391 			err = got_gitproto_match_capabilities(&my_capabilities,
392 			    NULL, server_capabilities, got_capabilities,
393 			    nitems(got_capabilities));
394 			if (err)
395 				goto done;
396 			if (chattygot)
397 				fprintf(stderr, "%s: my capabilities:%s\n",
398 				    getprogname(),
399 				    my_capabilities ? my_capabilities : "");
400 			is_firstpkt = 0;
401 		}
402 		if (strstr(refname, "^{}")) {
403 			if (chattygot) {
404 				fprintf(stderr, "%s: ignoring %s\n",
405 				    getprogname(), refname);
406 			}
407 			continue;
408 		}
409 
410 		id = malloc(sizeof(*id));
411 		if (id == NULL) {
412 			err = got_error_from_errno("malloc");
413 			goto done;
414 		}
415 		if (!got_parse_object_id(id, id_str, GOT_HASH_SHA1)) {
416 			err = got_error(GOT_ERR_BAD_OBJ_ID_STR);
417 			goto done;
418 		}
419 		err = send_their_ref(ibuf, id, refname);
420 		if (err)
421 			goto done;
422 
423 		err = got_pathlist_append(&their_refs, refname, id);
424 		if (err)
425 			goto done;
426 
427 		if (chattygot)
428 			fprintf(stderr, "%s: remote has %s %s\n",
429 			    getprogname(), refname, id_str);
430 		free(id_str);
431 		id_str = NULL;
432 		refname = NULL; /* do not free; owned by their_refs */
433 		id = NULL; /* do not free; owned by their_refs */
434 	}
435 
436 	if (!TAILQ_EMPTY(delete_refs)) {
437 		if (my_capabilities == NULL ||
438 		    strstr(my_capabilities, GOT_CAPA_DELETE_REFS) == NULL) {
439 			err = got_error(GOT_ERR_CAPA_DELETE_REFS);
440 			goto done;
441 		}
442 	}
443 
444 	TAILQ_FOREACH(pe, delete_refs, entry) {
445 		const char *refname = pe->path;
446 		struct got_pathlist_entry *their_pe;
447 		struct got_object_id *their_id = NULL;
448 
449 		TAILQ_FOREACH(their_pe, &their_refs, entry) {
450 			const char *their_refname = their_pe->path;
451 			if (got_path_cmp(refname, their_refname,
452 			    strlen(refname), strlen(their_refname)) == 0) {
453 				their_id = their_pe->data;
454 				break;
455 			}
456 		}
457 		if (their_id == NULL) {
458 			err = got_error_fmt(GOT_ERR_NOT_REF,
459 			    "%s does not exist in remote repository",
460 			    refname);
461 			goto done;
462 		}
463 
464 		got_sha1_digest_to_str(their_id->sha1, old_hashstr,
465 		    sizeof(old_hashstr));
466 		got_sha1_digest_to_str(zero_id, new_hashstr,
467 		    sizeof(new_hashstr));
468 		err = describe_refchange(&n, &sent_my_capabilites,
469 		    my_capabilities, buf, sizeof(buf), refname,
470 		    old_hashstr, new_hashstr);
471 		if (err)
472 			goto done;
473 		err = got_pkt_writepkt(fd, buf, n, chattygot);
474 		if (err)
475 			goto done;
476 		if (chattygot) {
477 			fprintf(stderr, "%s: deleting %s %s\n",
478 			    getprogname(), refname, old_hashstr);
479 		}
480 		nsent++;
481 	}
482 
483 	TAILQ_FOREACH(pe, refs, entry) {
484 		const char *refname = pe->path;
485 		struct got_object_id *id = pe->data;
486 		struct got_object_id *their_id = NULL;
487 		struct got_pathlist_entry *their_pe;
488 
489 		TAILQ_FOREACH(their_pe, &their_refs, entry) {
490 			const char *their_refname = their_pe->path;
491 			if (got_path_cmp(refname, their_refname,
492 			    strlen(refname), strlen(their_refname)) == 0) {
493 				their_id = their_pe->data;
494 				break;
495 			}
496 		}
497 		if (their_id) {
498 			if (got_object_id_cmp(id, their_id) == 0) {
499 				if (chattygot) {
500 					fprintf(stderr,
501 					    "%s: no change for %s\n",
502 					    getprogname(), refname);
503 				}
504 				continue;
505 			}
506 			got_sha1_digest_to_str(their_id->sha1, old_hashstr,
507 			    sizeof(old_hashstr));
508 		} else {
509 			got_sha1_digest_to_str(zero_id, old_hashstr,
510 			    sizeof(old_hashstr));
511 		}
512 		got_sha1_digest_to_str(id->sha1, new_hashstr,
513 		    sizeof(new_hashstr));
514 		err = describe_refchange(&n, &sent_my_capabilites,
515 		    my_capabilities, buf, sizeof(buf), refname,
516 		    old_hashstr, new_hashstr);
517 		if (err)
518 			goto done;
519 		err = got_pkt_writepkt(fd, buf, n, chattygot);
520 		if (err)
521 			goto done;
522 		if (chattygot) {
523 			if (their_id) {
524 				fprintf(stderr, "%s: updating %s %s -> %s\n",
525 				    getprogname(), refname, old_hashstr,
526 				    new_hashstr);
527 			} else {
528 				fprintf(stderr, "%s: creating %s %s\n",
529 				    getprogname(), refname, new_hashstr);
530 			}
531 		}
532 		nsent++;
533 	}
534 	err = got_pkt_flushpkt(fd, chattygot);
535 	if (err)
536 		goto done;
537 
538 	err = send_pack_request(ibuf);
539 	if (err)
540 		goto done;
541 
542 	err = recv_packfd(&packfd, ibuf);
543 	if (err)
544 		goto done;
545 
546 	if (packfd != -1) {
547 		err = send_pack_file(fd, packfd, ibuf);
548 		if (err)
549 			goto done;
550 	}
551 
552 	err = got_pkt_readpkt(&n, fd, buf, sizeof(buf), chattygot);
553 	if (err)
554 		goto done;
555 	if (n >= 4 && strncmp(buf, "ERR ", 4) == 0) {
556 		err = send_error(&buf[4], n - 4);
557 		goto done;
558 	} else if (n < 10 || strncmp(buf, "unpack ok\n", 10) != 0) {
559 		err = got_error_msg(GOT_ERR_BAD_PACKET,
560 		    "unexpected message from server");
561 		goto done;
562 	}
563 
564 	while (nsent > 0) {
565 		err = got_pkt_readpkt(&n, fd, buf, sizeof(buf), chattygot);
566 		if (err)
567 			goto done;
568 		if (n < 3) {
569 			err = got_error_msg(GOT_ERR_BAD_PACKET,
570 			    "unexpected message from server");
571 			goto done;
572 		} else if (n >= 4 && strncmp(buf, "ERR ", 4) == 0) {
573 			err = send_error(&buf[4], n - 4);
574 			goto done;
575 		} else if (strncmp(buf, "ok ", 3) == 0) {
576 			err = send_ref_status(ibuf, buf + 3, 1,
577 			    refs, delete_refs);
578 			if (err)
579 				goto done;
580 		} else if (strncmp(buf, "ng ", 3) == 0) {
581 			err = send_ref_status(ibuf, buf + 3, 0,
582 			    refs, delete_refs);
583 			if (err)
584 				goto done;
585 		} else {
586 			err = got_error_msg(GOT_ERR_BAD_PACKET,
587 			    "unexpected message from server");
588 			goto done;
589 		}
590 		nsent--;
591 	}
592 
593 	err = send_done(ibuf);
594 done:
595 	got_pathlist_free(&their_refs, GOT_PATHLIST_FREE_ALL);
596 	free(id_str);
597 	free(id);
598 	free(refname);
599 	free(server_capabilities);
600 	return err;
601 }
602 
603 int
604 main(int argc, char **argv)
605 {
606 	const struct got_error *err = NULL;
607 	int sendfd = -1;
608 	struct imsgbuf ibuf;
609 	struct imsg imsg;
610 	struct got_pathlist_head refs;
611 	struct got_pathlist_head delete_refs;
612 	struct got_imsg_send_request send_req;
613 	struct got_imsg_send_ref href;
614 	size_t datalen, i;
615 #if 0
616 	static int attached;
617 	while (!attached)
618 		sleep (1);
619 #endif
620 
621 	TAILQ_INIT(&refs);
622 	TAILQ_INIT(&delete_refs);
623 
624 	imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
625 #ifndef PROFILE
626 	/* revoke access to most system calls */
627 	if (pledge("stdio recvfd", NULL) == -1) {
628 		err = got_error_from_errno("pledge");
629 		got_privsep_send_error(&ibuf, err);
630 		return 1;
631 	}
632 
633 	/* revoke fs access */
634 	if (landlock_no_fs() == -1) {
635 		err = got_error_from_errno("landlock_no_fs");
636 		got_privsep_send_error(&ibuf, err);
637 		return 1;
638 	}
639 	if (cap_enter() == -1) {
640 		err = got_error_from_errno("cap_enter");
641 		got_privsep_send_error(&ibuf, err);
642 		return 1;
643 	}
644 #endif
645 	if ((err = got_privsep_recv_imsg(&imsg, &ibuf, 0)) != 0) {
646 		if (err->code == GOT_ERR_PRIVSEP_PIPE)
647 			err = NULL;
648 		goto done;
649 	}
650 	if (imsg.hdr.type == GOT_IMSG_STOP)
651 		goto done;
652 	if (imsg.hdr.type != GOT_IMSG_SEND_REQUEST) {
653 		err = got_error(GOT_ERR_PRIVSEP_MSG);
654 		goto done;
655 	}
656 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
657 	if (datalen < sizeof(send_req)) {
658 		err = got_error(GOT_ERR_PRIVSEP_LEN);
659 		goto done;
660 	}
661 	memcpy(&send_req, imsg.data, sizeof(send_req));
662 	sendfd = imsg.fd;
663 	imsg_free(&imsg);
664 
665 	if (send_req.verbosity > 0)
666 		chattygot += send_req.verbosity;
667 
668 	for (i = 0; i < send_req.nrefs; i++) {
669 		struct got_object_id *id;
670 		char *refname;
671 
672 		if ((err = got_privsep_recv_imsg(&imsg, &ibuf, 0)) != 0) {
673 			if (err->code == GOT_ERR_PRIVSEP_PIPE)
674 				err = NULL;
675 			goto done;
676 		}
677 		if (imsg.hdr.type == GOT_IMSG_STOP)
678 			goto done;
679 		if (imsg.hdr.type != GOT_IMSG_SEND_REF) {
680 			err = got_error(GOT_ERR_PRIVSEP_MSG);
681 			goto done;
682 		}
683 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
684 		if (datalen < sizeof(href)) {
685 			err = got_error(GOT_ERR_PRIVSEP_LEN);
686 			goto done;
687 		}
688 		memcpy(&href, imsg.data, sizeof(href));
689 		if (datalen - sizeof(href) < href.name_len) {
690 			err = got_error(GOT_ERR_PRIVSEP_LEN);
691 			goto done;
692 		}
693 		refname = malloc(href.name_len + 1);
694 		if (refname == NULL) {
695 			err = got_error_from_errno("malloc");
696 			goto done;
697 		}
698 		memcpy(refname, imsg.data + sizeof(href), href.name_len);
699 		refname[href.name_len] = '\0';
700 
701 		/*
702 		 * Prevent sending of references that won't make any
703 		 * sense outside the local repository's context.
704 		 */
705 		if (strncmp(refname, "refs/got/", 9) == 0 ||
706 		    strncmp(refname, "refs/remotes/", 13) == 0) {
707 			err = got_error_fmt(GOT_ERR_SEND_BAD_REF,
708 			    "%s", refname);
709 			goto done;
710 		}
711 
712 		id = malloc(sizeof(*id));
713 		if (id == NULL) {
714 			free(refname);
715 			err = got_error_from_errno("malloc");
716 			goto done;
717 		}
718 		memcpy(id, &href.id, sizeof(*id));
719 		if (href.delete)
720 			err = got_pathlist_append(&delete_refs, refname, id);
721 		else
722 			err = got_pathlist_append(&refs, refname, id);
723 		if (err) {
724 			free(refname);
725 			free(id);
726 			goto done;
727 		}
728 
729 		imsg_free(&imsg);
730 	}
731 
732 	err = send_pack(sendfd, &refs, &delete_refs, &ibuf);
733 done:
734 	got_pathlist_free(&refs, GOT_PATHLIST_FREE_ALL);
735 	got_pathlist_free(&delete_refs, GOT_PATHLIST_FREE_ALL);
736 	if (sendfd != -1 && close(sendfd) == -1 && err == NULL)
737 		err = got_error_from_errno("close");
738 	if (err != NULL && err->code != GOT_ERR_CANCELLED)  {
739 		fprintf(stderr, "%s: %s\n", getprogname(), err->msg);
740 		got_privsep_send_error(&ibuf, err);
741 	}
742 
743 	exit(0);
744 }