1 /*
2  * Copyright (c) 2018, 2019 Stefan Sperling <stsp@openbsd.org>
3  * Copyright (c) 2019, Ori Bernstein <ori@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 /*
19  * All code runs under the same UID but sensitive code paths are
20  * run in a separate process with tighter pledge(2) promises.
21  * Data is communicated between processes via imsg_flush(3) and imsg_read(3).
22  * This behaviour is transparent to users of the library.
23  *
24  * We generally transmit data in imsg buffers, split across several messages
25  * if necessary. File descriptors are used in cases where this is impractical,
26  * such as when accessing pack files or when transferring large blobs.
27  *
28  * We exec(2) after a fork(2). Parts of our library functionality are
29  * accessible via separate executables in a libexec directory.
30  */
31 
32 #define GOT_IMSG_FD_CHILD (STDERR_FILENO + 1)
33 
34 #ifndef GOT_LIBEXECDIR
35 #define GOT_LIBEXECDIR /usr/libexec
36 #endif
37 
38 /* Names of helper programs in libexec directory */
39 #define GOT_PROG_READ_OBJECT	got-read-object
40 #define GOT_PROG_READ_TREE	got-read-tree
41 #define GOT_PROG_READ_COMMIT	got-read-commit
42 #define GOT_PROG_READ_BLOB	got-read-blob
43 #define GOT_PROG_READ_TAG	got-read-tag
44 #define GOT_PROG_READ_PACK	got-read-pack
45 #define GOT_PROG_READ_GITCONFIG	got-read-gitconfig
46 #define GOT_PROG_READ_GOTCONFIG	got-read-gotconfig
47 #define GOT_PROG_READ_PATCH	got-read-patch
48 #define GOT_PROG_FETCH_PACK	got-fetch-pack
49 #define GOT_PROG_INDEX_PACK	got-index-pack
50 #define GOT_PROG_SEND_PACK	got-send-pack
51 
52 #define GOT_STRINGIFY(x) #x
53 #define GOT_STRINGVAL(x) GOT_STRINGIFY(x)
54 
55 /* Paths to helper programs in libexec directory */
56 #define GOT_PATH_PROG_READ_OBJECT \
57 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_READ_OBJECT)
58 #define GOT_PATH_PROG_READ_TREE \
59 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_READ_TREE)
60 #define GOT_PATH_PROG_READ_COMMIT \
61 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_READ_COMMIT)
62 #define GOT_PATH_PROG_READ_BLOB \
63 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_READ_BLOB)
64 #define GOT_PATH_PROG_READ_TAG \
65 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_READ_TAG)
66 #define GOT_PATH_PROG_READ_PACK \
67 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_READ_PACK)
68 #define GOT_PATH_PROG_READ_GITCONFIG \
69 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_READ_GITCONFIG)
70 #define GOT_PATH_PROG_READ_GOTCONFIG \
71 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_READ_GOTCONFIG)
72 #define GOT_PATH_PROG_READ_PATCH \
73 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_READ_PATCH)
74 #define GOT_PATH_PROG_FETCH_PACK \
75 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_FETCH_PACK)
76 #define GOT_PATH_PROG_SEND_PACK \
77 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_SEND_PACK)
78 #define GOT_PATH_PROG_INDEX_PACK \
79 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_INDEX_PACK)
80 
81 struct got_privsep_child {
82 	int imsg_fd;
83 	pid_t pid;
84 	struct imsgbuf *ibuf;
85 };
86 
87 enum got_imsg_type {
88 	/* An error occured while processing a request. */
89 	GOT_IMSG_ERROR,
90 
91 	/* Stop the child process. */
92 	GOT_IMSG_STOP,
93 
94 	/*
95 	 * Messages concerned with read access to objects in a repository.
96 	 * Object and pack files are opened by the main process, where
97 	 * data may be read as a byte string but without any interpretation.
98 	 * Decompression and parsing of object and pack files occurs in a
99 	 * separate process which runs under pledge("stdio recvfd").
100 	 * This sandboxes our own repository parsing code, as well as zlib.
101 	 */
102 	GOT_IMSG_OBJECT_REQUEST,
103 	GOT_IMSG_OBJECT,
104 	GOT_IMSG_COMMIT_REQUEST,
105 	GOT_IMSG_COMMIT,
106 	GOT_IMSG_COMMIT_LOGMSG,
107 	GOT_IMSG_TREE_REQUEST,
108 	GOT_IMSG_TREE,
109 	GOT_IMSG_TREE_ENTRY,
110 	GOT_IMSG_BLOB_REQUEST,
111 	GOT_IMSG_BLOB_OUTFD,
112 	GOT_IMSG_BLOB,
113 	GOT_IMSG_TAG_REQUEST,
114 	GOT_IMSG_TAG,
115 	GOT_IMSG_TAG_TAGMSG,
116 
117 	/* Messages related to networking. */
118 	GOT_IMSG_FETCH_REQUEST,
119 	GOT_IMSG_FETCH_HAVE_REF,
120 	GOT_IMSG_FETCH_WANTED_BRANCH,
121 	GOT_IMSG_FETCH_WANTED_REF,
122 	GOT_IMSG_FETCH_OUTFD,
123 	GOT_IMSG_FETCH_SYMREFS,
124 	GOT_IMSG_FETCH_REF,
125 	GOT_IMSG_FETCH_SERVER_PROGRESS,
126 	GOT_IMSG_FETCH_DOWNLOAD_PROGRESS,
127 	GOT_IMSG_FETCH_DONE,
128 	GOT_IMSG_IDXPACK_REQUEST,
129 	GOT_IMSG_IDXPACK_OUTFD,
130 	GOT_IMSG_IDXPACK_PROGRESS,
131 	GOT_IMSG_IDXPACK_DONE,
132 	GOT_IMSG_SEND_REQUEST,
133 	GOT_IMSG_SEND_REF,
134 	GOT_IMSG_SEND_REMOTE_REF,
135 	GOT_IMSG_SEND_REF_STATUS,
136 	GOT_IMSG_SEND_PACK_REQUEST,
137 	GOT_IMSG_SEND_PACKFD,
138 	GOT_IMSG_SEND_UPLOAD_PROGRESS,
139 	GOT_IMSG_SEND_DONE,
140 
141 	/* Messages related to pack files. */
142 	GOT_IMSG_PACKIDX,
143 	GOT_IMSG_PACK,
144 	GOT_IMSG_PACKED_OBJECT_REQUEST,
145 	GOT_IMSG_COMMIT_TRAVERSAL_REQUEST,
146 	GOT_IMSG_TRAVERSED_COMMITS,
147 	GOT_IMSG_COMMIT_TRAVERSAL_DONE,
148 
149 	/* Message sending file descriptor to a temporary file. */
150 	GOT_IMSG_TMPFD,
151 
152 	/* Messages related to gitconfig files. */
153 	GOT_IMSG_GITCONFIG_PARSE_REQUEST,
154 	GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST,
155 	GOT_IMSG_GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST,
156 	GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST,
157 	GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST,
158 	GOT_IMSG_GITCONFIG_REMOTES_REQUEST,
159 	GOT_IMSG_GITCONFIG_INT_VAL,
160 	GOT_IMSG_GITCONFIG_STR_VAL,
161 	GOT_IMSG_GITCONFIG_REMOTES,
162 	GOT_IMSG_GITCONFIG_REMOTE,
163 	GOT_IMSG_GITCONFIG_OWNER_REQUEST,
164 	GOT_IMSG_GITCONFIG_OWNER,
165 
166 	/* Messages related to gotconfig files. */
167 	GOT_IMSG_GOTCONFIG_PARSE_REQUEST,
168 	GOT_IMSG_GOTCONFIG_AUTHOR_REQUEST,
169 	GOT_IMSG_GOTCONFIG_REMOTES_REQUEST,
170 	GOT_IMSG_GOTCONFIG_INT_VAL,
171 	GOT_IMSG_GOTCONFIG_STR_VAL,
172 	GOT_IMSG_GOTCONFIG_REMOTES,
173 	GOT_IMSG_GOTCONFIG_REMOTE,
174 
175 	/* Raw object access. Uncompress object data but do not parse it. */
176 	GOT_IMSG_RAW_OBJECT_REQUEST,
177 	GOT_IMSG_RAW_OBJECT_OUTFD,
178 	GOT_IMSG_PACKED_RAW_OBJECT_REQUEST,
179 	GOT_IMSG_RAW_OBJECT,
180 
181 	/* Read raw delta data from pack files. */
182 	GOT_IMSG_RAW_DELTA_OUTFD,
183 	GOT_IMSG_RAW_DELTA_REQUEST,
184 	GOT_IMSG_RAW_DELTA,
185 
186 	/* Messages related to patch files. */
187 	GOT_IMSG_PATCH_FILE,
188 	GOT_IMSG_PATCH_HUNK,
189 	GOT_IMSG_PATCH_DONE,
190 	GOT_IMSG_PATCH_LINE,
191 	GOT_IMSG_PATCH,
192 	GOT_IMSG_PATCH_EOF,
193 };
194 
195 /* Structure for GOT_IMSG_ERROR. */
196 struct got_imsg_error {
197 	int code; /* an error code from got_error.h */
198 	int errno_code; /* in case code equals GOT_ERR_ERRNO */
199 } __attribute__((__packed__));
200 
201 /*
202  * Structure for GOT_IMSG_TREE_REQUEST and GOT_IMSG_OBJECT data.
203  */
204 struct got_imsg_object {
205 	uint8_t id[SHA1_DIGEST_LENGTH];
206 
207 	/* These fields are the same as in struct got_object. */
208 	int type;
209 	int flags;
210 	size_t hdrlen;
211 	size_t size;
212 	off_t pack_offset;
213 	int pack_idx;
214 }  __attribute__((__packed__));
215 
216 /* Structure for GOT_IMSG_COMMIT data. */
217 struct got_imsg_commit_object {
218 	uint8_t tree_id[SHA1_DIGEST_LENGTH];
219 	size_t author_len;
220 	time_t author_time;
221 	time_t author_gmtoff;
222 	size_t committer_len;
223 	time_t committer_time;
224 	time_t committer_gmtoff;
225 	size_t logmsg_len;
226 	int nparents;
227 
228 	/*
229 	 * Followed by author_len + committer_len data bytes
230 	 */
231 
232 	/* Followed by 'nparents' SHA1_DIGEST_LENGTH length strings */
233 
234 	/*
235 	 * Followed by 'logmsg_len' bytes of commit log message data in
236 	 * one or more GOT_IMSG_COMMIT_LOGMSG messages.
237 	 */
238 } __attribute__((__packed__));
239 
240 
241 /* Structure for GOT_IMSG_TREE_ENTRY. */
242 struct got_imsg_tree_entry {
243 	char id[SHA1_DIGEST_LENGTH];
244 	mode_t mode;
245 	/* Followed by entry's name in remaining data of imsg buffer. */
246 } __attribute__((__packed__));
247 
248 /* Structure for GOT_IMSG_TREE_OBJECT_REPLY data. */
249 struct got_imsg_tree_object {
250 	int nentries; /* This many TREE_ENTRY messages follow. */
251 };
252 
253 /* Structure for GOT_IMSG_BLOB. */
254 struct got_imsg_blob {
255 	size_t size;
256 	size_t hdrlen;
257 
258 	/*
259 	 * If size <= GOT_PRIVSEP_INLINE_BLOB_DATA_MAX, blob data follows
260 	 * in the imsg buffer. Otherwise, blob data has been written to a
261 	 * file descriptor passed via the GOT_IMSG_BLOB_OUTFD imsg.
262 	 */
263 #define GOT_PRIVSEP_INLINE_BLOB_DATA_MAX \
264 	(MAX_IMSGSIZE - IMSG_HEADER_SIZE - sizeof(struct got_imsg_blob))
265 };
266 
267 /* Structure for GOT_IMSG_RAW_OBJECT. */
268 struct got_imsg_raw_obj {
269 	off_t size;
270 	size_t hdrlen;
271 
272 	/*
273 	 * If size <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX, object data follows
274 	 * in the imsg buffer. Otherwise, object data has been written to a
275 	 * file descriptor passed via the GOT_IMSG_RAW_OBJECT_OUTFD imsg.
276 	 */
277 #define GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX \
278 	(MAX_IMSGSIZE - IMSG_HEADER_SIZE - sizeof(struct got_imsg_raw_obj))
279 };
280 
281 /* Structure for GOT_IMSG_RAW_DELTA. */
282 struct got_imsg_raw_delta {
283 	uint8_t base_id[SHA1_DIGEST_LENGTH];
284 	uint64_t base_size;
285 	uint64_t result_size;
286 	off_t delta_size;
287 	off_t delta_offset;
288 	off_t delta_out_offset;
289 
290 	/*
291 	 * Delta data has been written at delta_out_offset to the file
292 	 * descriptor passed via the GOT_IMSG_RAW_DELTA_OUTFD imsg.
293 	 */
294 };
295 
296 /* Structure for GOT_IMSG_TAG data. */
297 struct got_imsg_tag_object {
298 	uint8_t id[SHA1_DIGEST_LENGTH];
299 	int obj_type;
300 	size_t tag_len;
301 	size_t tagger_len;
302 	time_t tagger_time;
303 	time_t tagger_gmtoff;
304 	size_t tagmsg_len;
305 
306 	/*
307 	 * Followed by tag_len + tagger_len data bytes
308 	 */
309 
310 	/*
311 	 * Followed by 'tagmsg_len' bytes of tag message data in
312 	 * one or more GOT_IMSG_TAG_TAGMSG messages.
313 	 */
314 } __attribute__((__packed__));
315 
316 /* Structure for GOT_IMSG_FETCH_HAVE_REF data. */
317 struct got_imsg_fetch_have_ref {
318 	uint8_t id[SHA1_DIGEST_LENGTH];
319 	size_t name_len;
320 	/* Followed by name_len data bytes. */
321 } __attribute__((__packed__));
322 
323 /* Structure for GOT_IMSG_FETCH_WANTED_BRANCH data. */
324 struct got_imsg_fetch_wanted_branch {
325 	size_t name_len;
326 	/* Followed by name_len data bytes. */
327 } __attribute__((__packed__));
328 
329 /* Structure for GOT_IMSG_FETCH_WANTED_REF data. */
330 struct got_imsg_fetch_wanted_ref {
331 	size_t name_len;
332 	/* Followed by name_len data bytes. */
333 } __attribute__((__packed__));
334 
335 /* Structure for GOT_IMSG_FETCH_REQUEST data. */
336 struct got_imsg_fetch_request {
337 	int fetch_all_branches;
338 	int list_refs_only;
339 	int verbosity;
340 	size_t n_have_refs;
341 	size_t n_wanted_branches;
342 	size_t n_wanted_refs;
343 	/* Followed by n_have_refs GOT_IMSG_FETCH_HAVE_REF messages. */
344 	/* Followed by n_wanted_branches times GOT_IMSG_FETCH_WANTED_BRANCH. */
345 	/* Followed by n_wanted_refs times GOT_IMSG_FETCH_WANTED_REF. */
346 } __attribute__((__packed__));
347 
348 /* Structures for GOT_IMSG_FETCH_SYMREFS data. */
349 struct got_imsg_fetch_symref {
350 	size_t name_len;
351 	size_t target_len;
352 
353 	/*
354 	 * Followed by name_len + target_len data bytes.
355 	 */
356 } __attribute__((__packed__));
357 
358 struct got_imsg_fetch_symrefs {
359 	size_t nsymrefs;
360 
361 	/* Followed by nsymrefs times of got_imsg_fetch_symref data. */
362 } __attribute__((__packed__));
363 
364 /* Structure for GOT_IMSG_FETCH_REF data. */
365 struct got_imsg_fetch_ref {
366 	/* Describes a reference which will be fetched. */
367 	uint8_t refid[SHA1_DIGEST_LENGTH];
368 	/* Followed by reference name in remaining data of imsg buffer. */
369 };
370 
371 /* Structure for GOT_IMSG_FETCH_DOWNLOAD_PROGRESS data. */
372 struct got_imsg_fetch_download_progress {
373 	/* Number of packfile data bytes downloaded so far. */
374 	off_t packfile_bytes;
375 };
376 
377 /* Structure for GOT_IMSG_SEND_REQUEST data. */
378 struct got_imsg_send_request {
379 	int verbosity;
380 	size_t nrefs;
381 	/* Followed by nrefs GOT_IMSG_SEND_REF messages. */
382 } __attribute__((__packed__));
383 
384 /* Structure for GOT_IMSG_SEND_UPLOAD_PROGRESS data. */
385 struct got_imsg_send_upload_progress {
386 	/* Number of packfile data bytes uploaded so far. */
387 	off_t packfile_bytes;
388 };
389 
390 /* Structure for GOT_IMSG_SEND_REF data. */
391 struct got_imsg_send_ref {
392 	uint8_t id[SHA1_DIGEST_LENGTH];
393 	int delete;
394 	size_t name_len;
395 	/* Followed by name_len data bytes. */
396 } __attribute__((__packed__));
397 
398 /* Structure for GOT_IMSG_SEND_REMOTE_REF data. */
399 struct got_imsg_send_remote_ref {
400 	uint8_t id[SHA1_DIGEST_LENGTH];
401 	size_t name_len;
402 	/* Followed by name_len data bytes. */
403 } __attribute__((__packed__));
404 
405 /* Structure for GOT_IMSG_SEND_REF_STATUS data. */
406 struct got_imsg_send_ref_status {
407 	int success;
408 	size_t name_len;
409 	/* Followed by name_len data bytes. */
410 } __attribute__((__packed__));
411 
412 /* Structure for GOT_IMSG_IDXPACK_REQUEST data. */
413 struct got_imsg_index_pack_request {
414 	uint8_t pack_hash[SHA1_DIGEST_LENGTH];
415 } __attribute__((__packed__));
416 
417 /* Structure for GOT_IMSG_IDXPACK_PROGRESS data. */
418 struct got_imsg_index_pack_progress {
419 	/* Total number of objects in pack file. */
420 	int nobj_total;
421 
422 	/* Number of objects indexed so far. */
423 	int nobj_indexed;
424 
425 	/* Number of non-deltified objects in pack file. */
426 	int nobj_loose;
427 
428 	/* Number of deltified objects resolved so far. */
429 	int nobj_resolved;
430 };
431 
432 /* Structure for GOT_IMSG_PACKIDX. */
433 struct got_imsg_packidx {
434 	size_t len;
435 	off_t packfile_size;
436 	/* Additionally, a file desciptor is passed via imsg. */
437 };
438 
439 /* Structure for GOT_IMSG_PACK. */
440 struct got_imsg_pack {
441 	char path_packfile[PATH_MAX];
442 	size_t filesize;
443 	/* Additionally, a file desciptor is passed via imsg. */
444 } __attribute__((__packed__));
445 
446 /*
447  * Structure for GOT_IMSG_OBJECT_REQUEST, GOT_IMSG_BLOB_REQUEST,
448  * GOT_IMSG_TREE_REQUEST, GOT_IMSG_COMMIT_REQUEST, and
449  * GOT_IMSG_TAG_REQUEST data.
450  */
451 struct got_object_id;
452 
453 /*
454  * Structure for GOT_IMSG_PACKED_OBJECT_REQUEST and
455  * GOT_IMSG_PACKED_RAW_OBJECT_REQUEST data.
456  */
457 struct got_imsg_packed_object {
458 	uint8_t id[SHA1_DIGEST_LENGTH];
459 	int idx;
460 } __attribute__((__packed__));
461 
462 /*
463  * Structure for GOT_IMSG_DELTA data.
464  */
465 struct got_imsg_delta {
466 	/* These fields are the same as in struct got_delta. */
467 	off_t offset;
468 	size_t tslen;
469 	int type;
470 	size_t size;
471 	off_t data_offset;
472 };
473 
474 /*
475  * Structure for GOT_IMSG_RAW_DELTA_REQUEST data.
476  */
477 struct got_imsg_raw_delta_request {
478 	uint8_t id[SHA1_DIGEST_LENGTH];
479 	int idx;
480 };
481 
482 /* Structure for GOT_IMSG_COMMIT_TRAVERSAL_REQUEST  */
483 struct got_imsg_commit_traversal_request {
484 	uint8_t id[SHA1_DIGEST_LENGTH];
485 	int idx;
486 	size_t path_len;
487 	/* Followed by path_len bytes of path data */
488 } __attribute__((__packed__));
489 
490 /* Structure for GOT_IMSG_TRAVERSED_COMMITS  */
491 struct got_imsg_traversed_commits {
492 	size_t ncommits;
493 	/* Followed by ncommit IDs of SHA1_DIGEST_LENGTH each */
494 } __attribute__((__packed__));
495 
496 /*
497  * Structure for GOT_IMSG_GOTCONFIG_REMOTE and
498  * GOT_IMSG_GOTCONFIG_REMOTE data.
499  */
500 struct got_imsg_remote {
501 	size_t name_len;
502 	size_t fetch_url_len;
503 	size_t send_url_len;
504 	int mirror_references;
505 	int fetch_all_branches;
506 	int nfetch_branches;
507 	int nsend_branches;
508 	int nfetch_refs;
509 
510 	/* Followed by name_len data bytes. */
511 	/* Followed by fetch_url_len + send_url_len data bytes. */
512 	/* Followed by nfetch_branches GOT_IMSG_GITCONFIG_STR_VAL messages. */
513 	/* Followed by nsend_branches GOT_IMSG_GITCONFIG_STR_VAL messages. */
514 	/* Followed by nfetch_refs GOT_IMSG_GITCONFIG_STR_VAL messages. */
515 } __attribute__((__packed__));
516 
517 /*
518  * Structure for GOT_IMSG_GITCONFIG_REMOTES data.
519  */
520 struct got_imsg_remotes {
521 	int nremotes; /* This many GOT_IMSG_GITCONFIG_REMOTE messages follow. */
522 };
523 
524 /*
525  * Structure for GOT_IMSG_PATCH data.
526  */
527 struct got_imsg_patch {
528 	int	git;
529 	char	old[PATH_MAX];
530 	char	new[PATH_MAX];
531 };
532 
533 /*
534  * Structure for GOT_IMSG_PATCH_HUNK data.
535  */
536 struct got_imsg_patch_hunk {
537 	long	oldfrom;
538 	long	oldlines;
539 	long	newfrom;
540 	long	newlines;
541 };
542 
543 struct got_remote_repo;
544 struct got_pack;
545 struct got_packidx;
546 struct got_pathlist_head;
547 
548 const struct got_error *got_send_ack(pid_t);
549 const struct got_error *got_privsep_wait_for_child(pid_t);
550 const struct got_error *got_privsep_flush_imsg(struct imsgbuf *);
551 const struct got_error *got_privsep_send_stop(int);
552 const struct got_error *got_privsep_recv_imsg(struct imsg *, struct imsgbuf *,
553     size_t);
554 void got_privsep_send_error(struct imsgbuf *, const struct got_error *);
555 const struct got_error *got_privsep_send_ack(struct imsgbuf *);
556 const struct got_error *got_privsep_wait_ack(struct imsgbuf *);
557 const struct got_error *got_privsep_send_obj_req(struct imsgbuf *, int,
558     struct got_object_id *);
559 const struct got_error *got_privsep_send_raw_obj_req(struct imsgbuf *, int,
560     struct got_object_id *);
561 const struct got_error *got_privsep_send_raw_obj_outfd(struct imsgbuf *, int);
562 const struct got_error *got_privsep_send_commit_req(struct imsgbuf *, int,
563     struct got_object_id *, int);
564 const struct got_error *got_privsep_send_tree_req(struct imsgbuf *, int,
565     struct got_object_id *, int);
566 const struct got_error *got_privsep_send_tag_req(struct imsgbuf *, int,
567     struct got_object_id *, int);
568 const struct got_error *got_privsep_send_blob_req(struct imsgbuf *, int,
569     struct got_object_id *, int);
570 const struct got_error *got_privsep_send_blob_outfd(struct imsgbuf *, int);
571 const struct got_error *got_privsep_send_tmpfd(struct imsgbuf *, int);
572 const struct got_error *got_privsep_send_obj(struct imsgbuf *,
573     struct got_object *);
574 const struct got_error *got_privsep_send_index_pack_req(struct imsgbuf *,
575     uint8_t *, int);
576 const struct got_error *got_privsep_send_index_pack_outfd(struct imsgbuf *,
577     int);
578 const struct got_error *got_privsep_recv_index_progress(int *, int *, int *,
579     int *, int *, struct imsgbuf *ibuf);
580 const struct got_error *got_privsep_send_fetch_req(struct imsgbuf *, int,
581     struct got_pathlist_head *, int, struct got_pathlist_head *,
582     struct got_pathlist_head *, int, int);
583 const struct got_error *got_privsep_send_fetch_outfd(struct imsgbuf *, int);
584 const struct got_error *got_privsep_recv_fetch_progress(int *,
585     struct got_object_id **, char **, struct got_pathlist_head *, char **,
586     off_t *, uint8_t *, struct imsgbuf *);
587 const struct got_error *got_privsep_send_send_req(struct imsgbuf *, int,
588     struct got_pathlist_head *, struct got_pathlist_head *, int);
589 const struct got_error *got_privsep_recv_send_remote_refs(
590     struct got_pathlist_head *, struct imsgbuf *);
591 const struct got_error *got_privsep_send_packfd(struct imsgbuf *, int);
592 const struct got_error *got_privsep_recv_send_progress(int *, off_t *,
593     int *, char **, struct imsgbuf *);
594 const struct got_error *got_privsep_get_imsg_obj(struct got_object **,
595     struct imsg *, struct imsgbuf *);
596 const struct got_error *got_privsep_recv_obj(struct got_object **,
597     struct imsgbuf *);
598 const struct got_error *got_privsep_send_raw_obj(struct imsgbuf *, off_t,
599     size_t, uint8_t *);
600 const struct got_error *got_privsep_recv_raw_obj(uint8_t **, off_t *, size_t *,
601     struct imsgbuf *);
602 const struct got_error *got_privsep_send_commit(struct imsgbuf *,
603     struct got_commit_object *);
604 const struct got_error *got_privsep_recv_commit(struct got_commit_object **,
605     struct imsgbuf *);
606 const struct got_error *got_privsep_recv_tree(struct got_tree_object **,
607     struct imsgbuf *);
608 const struct got_error *got_privsep_send_tree(struct imsgbuf *,
609     struct got_pathlist_head *, int);
610 const struct got_error *got_privsep_send_blob(struct imsgbuf *, size_t, size_t,
611     const uint8_t *);
612 const struct got_error *got_privsep_recv_blob(uint8_t **, size_t *, size_t *,
613     struct imsgbuf *);
614 const struct got_error *got_privsep_send_tag(struct imsgbuf *,
615     struct got_tag_object *);
616 const struct got_error *got_privsep_recv_tag(struct got_tag_object **,
617     struct imsgbuf *);
618 const struct got_error *got_privsep_init_pack_child(struct imsgbuf *,
619     struct got_pack *, struct got_packidx *);
620 const struct got_error *got_privsep_send_packed_obj_req(struct imsgbuf *, int,
621     struct got_object_id *);
622 const struct got_error *got_privsep_send_packed_raw_obj_req(struct imsgbuf *,
623     int, struct got_object_id *);
624 const struct got_error *got_privsep_send_pack_child_ready(struct imsgbuf *);
625 
626 const struct got_error *got_privsep_send_gitconfig_parse_req(struct imsgbuf *,
627     int);
628 const struct got_error *
629     got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *);
630 const struct got_error *got_privsep_send_gitconfig_repository_extensions_req(
631     struct imsgbuf *);
632 const struct got_error *got_privsep_send_gitconfig_author_name_req(
633     struct imsgbuf *);
634 const struct got_error *got_privsep_send_gitconfig_author_email_req(
635     struct imsgbuf *);
636 const struct got_error *got_privsep_send_gitconfig_remotes_req(
637     struct imsgbuf *);
638 const struct got_error *got_privsep_send_gitconfig_owner_req(struct imsgbuf *);
639 const struct got_error *got_privsep_recv_gitconfig_str(char **,
640     struct imsgbuf *);
641 const struct got_error *got_privsep_recv_gitconfig_int(int *, struct imsgbuf *);
642 const struct got_error *got_privsep_recv_gitconfig_remotes(
643     struct got_remote_repo **, int *, struct imsgbuf *);
644 
645 const struct got_error *got_privsep_send_gotconfig_parse_req(struct imsgbuf *,
646     int);
647 const struct got_error *got_privsep_send_gotconfig_author_req(struct imsgbuf *);
648 const struct got_error *got_privsep_send_gotconfig_remotes_req(
649     struct imsgbuf *);
650 const struct got_error *got_privsep_recv_gotconfig_str(char **,
651     struct imsgbuf *);
652 const struct got_error *got_privsep_recv_gotconfig_remotes(
653     struct got_remote_repo **, int *, struct imsgbuf *);
654 
655 const struct got_error *got_privsep_send_commit_traversal_request(
656     struct imsgbuf *, struct got_object_id *, int, const char *);
657 const struct got_error *got_privsep_recv_traversed_commits(
658     struct got_commit_object **, struct got_object_id **,
659     struct got_object_id_queue *, struct imsgbuf *);
660 
661 const struct got_error *got_privsep_send_raw_delta_req(struct imsgbuf *, int,
662     struct got_object_id *);
663 const struct got_error *got_privsep_send_raw_delta_outfd(struct imsgbuf *, int);
664 const struct got_error *got_privsep_send_raw_delta(struct imsgbuf *, uint64_t,
665     uint64_t,  off_t, off_t, off_t, struct got_object_id *);
666 const struct got_error *got_privsep_recv_raw_delta(uint64_t *, uint64_t *,
667     off_t *, off_t *, off_t *, struct got_object_id **, struct imsgbuf *);
668 
669 void got_privsep_exec_child(int[2], const char *, const char *);