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_compressed_size;
288 	off_t delta_offset;
289 	off_t delta_out_offset;
290 
291 	/*
292 	 * Delta data has been written at delta_out_offset to the file
293 	 * descriptor passed via the GOT_IMSG_RAW_DELTA_OUTFD imsg.
294 	 */
295 };
296 
297 /* Structure for GOT_IMSG_TAG data. */
298 struct got_imsg_tag_object {
299 	uint8_t id[SHA1_DIGEST_LENGTH];
300 	int obj_type;
301 	size_t tag_len;
302 	size_t tagger_len;
303 	time_t tagger_time;
304 	time_t tagger_gmtoff;
305 	size_t tagmsg_len;
306 
307 	/*
308 	 * Followed by tag_len + tagger_len data bytes
309 	 */
310 
311 	/*
312 	 * Followed by 'tagmsg_len' bytes of tag message data in
313 	 * one or more GOT_IMSG_TAG_TAGMSG messages.
314 	 */
315 } __attribute__((__packed__));
316 
317 /* Structure for GOT_IMSG_FETCH_HAVE_REF data. */
318 struct got_imsg_fetch_have_ref {
319 	uint8_t id[SHA1_DIGEST_LENGTH];
320 	size_t name_len;
321 	/* Followed by name_len data bytes. */
322 } __attribute__((__packed__));
323 
324 /* Structure for GOT_IMSG_FETCH_WANTED_BRANCH data. */
325 struct got_imsg_fetch_wanted_branch {
326 	size_t name_len;
327 	/* Followed by name_len data bytes. */
328 } __attribute__((__packed__));
329 
330 /* Structure for GOT_IMSG_FETCH_WANTED_REF data. */
331 struct got_imsg_fetch_wanted_ref {
332 	size_t name_len;
333 	/* Followed by name_len data bytes. */
334 } __attribute__((__packed__));
335 
336 /* Structure for GOT_IMSG_FETCH_REQUEST data. */
337 struct got_imsg_fetch_request {
338 	int fetch_all_branches;
339 	int list_refs_only;
340 	int verbosity;
341 	size_t n_have_refs;
342 	size_t n_wanted_branches;
343 	size_t n_wanted_refs;
344 	/* Followed by n_have_refs GOT_IMSG_FETCH_HAVE_REF messages. */
345 	/* Followed by n_wanted_branches times GOT_IMSG_FETCH_WANTED_BRANCH. */
346 	/* Followed by n_wanted_refs times GOT_IMSG_FETCH_WANTED_REF. */
347 } __attribute__((__packed__));
348 
349 /* Structures for GOT_IMSG_FETCH_SYMREFS data. */
350 struct got_imsg_fetch_symref {
351 	size_t name_len;
352 	size_t target_len;
353 
354 	/*
355 	 * Followed by name_len + target_len data bytes.
356 	 */
357 } __attribute__((__packed__));
358 
359 struct got_imsg_fetch_symrefs {
360 	size_t nsymrefs;
361 
362 	/* Followed by nsymrefs times of got_imsg_fetch_symref data. */
363 } __attribute__((__packed__));
364 
365 /* Structure for GOT_IMSG_FETCH_REF data. */
366 struct got_imsg_fetch_ref {
367 	/* Describes a reference which will be fetched. */
368 	uint8_t refid[SHA1_DIGEST_LENGTH];
369 	/* Followed by reference name in remaining data of imsg buffer. */
370 };
371 
372 /* Structure for GOT_IMSG_FETCH_DOWNLOAD_PROGRESS data. */
373 struct got_imsg_fetch_download_progress {
374 	/* Number of packfile data bytes downloaded so far. */
375 	off_t packfile_bytes;
376 };
377 
378 /* Structure for GOT_IMSG_SEND_REQUEST data. */
379 struct got_imsg_send_request {
380 	int verbosity;
381 	size_t nrefs;
382 	/* Followed by nrefs GOT_IMSG_SEND_REF messages. */
383 } __attribute__((__packed__));
384 
385 /* Structure for GOT_IMSG_SEND_UPLOAD_PROGRESS data. */
386 struct got_imsg_send_upload_progress {
387 	/* Number of packfile data bytes uploaded so far. */
388 	off_t packfile_bytes;
389 };
390 
391 /* Structure for GOT_IMSG_SEND_REF data. */
392 struct got_imsg_send_ref {
393 	uint8_t id[SHA1_DIGEST_LENGTH];
394 	int delete;
395 	size_t name_len;
396 	/* Followed by name_len data bytes. */
397 } __attribute__((__packed__));
398 
399 /* Structure for GOT_IMSG_SEND_REMOTE_REF data. */
400 struct got_imsg_send_remote_ref {
401 	uint8_t id[SHA1_DIGEST_LENGTH];
402 	size_t name_len;
403 	/* Followed by name_len data bytes. */
404 } __attribute__((__packed__));
405 
406 /* Structure for GOT_IMSG_SEND_REF_STATUS data. */
407 struct got_imsg_send_ref_status {
408 	int success;
409 	size_t name_len;
410 	/* Followed by name_len data bytes. */
411 } __attribute__((__packed__));
412 
413 /* Structure for GOT_IMSG_IDXPACK_REQUEST data. */
414 struct got_imsg_index_pack_request {
415 	uint8_t pack_hash[SHA1_DIGEST_LENGTH];
416 } __attribute__((__packed__));
417 
418 /* Structure for GOT_IMSG_IDXPACK_PROGRESS data. */
419 struct got_imsg_index_pack_progress {
420 	/* Total number of objects in pack file. */
421 	int nobj_total;
422 
423 	/* Number of objects indexed so far. */
424 	int nobj_indexed;
425 
426 	/* Number of non-deltified objects in pack file. */
427 	int nobj_loose;
428 
429 	/* Number of deltified objects resolved so far. */
430 	int nobj_resolved;
431 };
432 
433 /* Structure for GOT_IMSG_PACKIDX. */
434 struct got_imsg_packidx {
435 	size_t len;
436 	off_t packfile_size;
437 	/* Additionally, a file desciptor is passed via imsg. */
438 };
439 
440 /* Structure for GOT_IMSG_PACK. */
441 struct got_imsg_pack {
442 	char path_packfile[PATH_MAX];
443 	size_t filesize;
444 	/* Additionally, a file desciptor is passed via imsg. */
445 } __attribute__((__packed__));
446 
447 /*
448  * Structure for GOT_IMSG_OBJECT_REQUEST, GOT_IMSG_BLOB_REQUEST,
449  * GOT_IMSG_TREE_REQUEST, GOT_IMSG_COMMIT_REQUEST, and
450  * GOT_IMSG_TAG_REQUEST data.
451  */
452 struct got_object_id;
453 
454 /*
455  * Structure for GOT_IMSG_PACKED_OBJECT_REQUEST and
456  * GOT_IMSG_PACKED_RAW_OBJECT_REQUEST data.
457  */
458 struct got_imsg_packed_object {
459 	uint8_t id[SHA1_DIGEST_LENGTH];
460 	int idx;
461 } __attribute__((__packed__));
462 
463 /*
464  * Structure for GOT_IMSG_DELTA data.
465  */
466 struct got_imsg_delta {
467 	/* These fields are the same as in struct got_delta. */
468 	off_t offset;
469 	size_t tslen;
470 	int type;
471 	size_t size;
472 	off_t data_offset;
473 };
474 
475 /*
476  * Structure for GOT_IMSG_RAW_DELTA_REQUEST data.
477  */
478 struct got_imsg_raw_delta_request {
479 	uint8_t id[SHA1_DIGEST_LENGTH];
480 	int idx;
481 };
482 
483 /* Structure for GOT_IMSG_COMMIT_TRAVERSAL_REQUEST  */
484 struct got_imsg_commit_traversal_request {
485 	uint8_t id[SHA1_DIGEST_LENGTH];
486 	int idx;
487 	size_t path_len;
488 	/* Followed by path_len bytes of path data */
489 } __attribute__((__packed__));
490 
491 /* Structure for GOT_IMSG_TRAVERSED_COMMITS  */
492 struct got_imsg_traversed_commits {
493 	size_t ncommits;
494 	/* Followed by ncommit IDs of SHA1_DIGEST_LENGTH each */
495 } __attribute__((__packed__));
496 
497 /*
498  * Structure for GOT_IMSG_GOTCONFIG_REMOTE and
499  * GOT_IMSG_GOTCONFIG_REMOTE data.
500  */
501 struct got_imsg_remote {
502 	size_t name_len;
503 	size_t fetch_url_len;
504 	size_t send_url_len;
505 	int mirror_references;
506 	int fetch_all_branches;
507 	int nfetch_branches;
508 	int nsend_branches;
509 	int nfetch_refs;
510 
511 	/* Followed by name_len data bytes. */
512 	/* Followed by fetch_url_len + send_url_len data bytes. */
513 	/* Followed by nfetch_branches GOT_IMSG_GITCONFIG_STR_VAL messages. */
514 	/* Followed by nsend_branches GOT_IMSG_GITCONFIG_STR_VAL messages. */
515 	/* Followed by nfetch_refs GOT_IMSG_GITCONFIG_STR_VAL messages. */
516 } __attribute__((__packed__));
517 
518 /*
519  * Structure for GOT_IMSG_GITCONFIG_REMOTES data.
520  */
521 struct got_imsg_remotes {
522 	int nremotes; /* This many GOT_IMSG_GITCONFIG_REMOTE messages follow. */
523 };
524 
525 /*
526  * Structure for GOT_IMSG_PATCH data.
527  */
528 struct got_imsg_patch {
529 	int	git;
530 	char	old[PATH_MAX];
531 	char	new[PATH_MAX];
532 };
533 
534 /*
535  * Structure for GOT_IMSG_PATCH_HUNK data.
536  */
537 struct got_imsg_patch_hunk {
538 	long	oldfrom;
539 	long	oldlines;
540 	long	newfrom;
541 	long	newlines;
542 };
543 
544 struct got_remote_repo;
545 struct got_pack;
546 struct got_packidx;
547 struct got_pathlist_head;
548 
549 const struct got_error *got_send_ack(pid_t);
550 const struct got_error *got_privsep_wait_for_child(pid_t);
551 const struct got_error *got_privsep_flush_imsg(struct imsgbuf *);
552 const struct got_error *got_privsep_send_stop(int);
553 const struct got_error *got_privsep_recv_imsg(struct imsg *, struct imsgbuf *,
554     size_t);
555 void got_privsep_send_error(struct imsgbuf *, const struct got_error *);
556 const struct got_error *got_privsep_send_ack(struct imsgbuf *);
557 const struct got_error *got_privsep_wait_ack(struct imsgbuf *);
558 const struct got_error *got_privsep_send_obj_req(struct imsgbuf *, int,
559     struct got_object_id *);
560 const struct got_error *got_privsep_send_raw_obj_req(struct imsgbuf *, int,
561     struct got_object_id *);
562 const struct got_error *got_privsep_send_raw_obj_outfd(struct imsgbuf *, int);
563 const struct got_error *got_privsep_send_commit_req(struct imsgbuf *, int,
564     struct got_object_id *, int);
565 const struct got_error *got_privsep_send_tree_req(struct imsgbuf *, int,
566     struct got_object_id *, int);
567 const struct got_error *got_privsep_send_tag_req(struct imsgbuf *, int,
568     struct got_object_id *, int);
569 const struct got_error *got_privsep_send_blob_req(struct imsgbuf *, int,
570     struct got_object_id *, int);
571 const struct got_error *got_privsep_send_blob_outfd(struct imsgbuf *, int);
572 const struct got_error *got_privsep_send_tmpfd(struct imsgbuf *, int);
573 const struct got_error *got_privsep_send_obj(struct imsgbuf *,
574     struct got_object *);
575 const struct got_error *got_privsep_send_index_pack_req(struct imsgbuf *,
576     uint8_t *, int);
577 const struct got_error *got_privsep_send_index_pack_outfd(struct imsgbuf *,
578     int);
579 const struct got_error *got_privsep_recv_index_progress(int *, int *, int *,
580     int *, int *, struct imsgbuf *ibuf);
581 const struct got_error *got_privsep_send_fetch_req(struct imsgbuf *, int,
582     struct got_pathlist_head *, int, struct got_pathlist_head *,
583     struct got_pathlist_head *, int, int);
584 const struct got_error *got_privsep_send_fetch_outfd(struct imsgbuf *, int);
585 const struct got_error *got_privsep_recv_fetch_progress(int *,
586     struct got_object_id **, char **, struct got_pathlist_head *, char **,
587     off_t *, uint8_t *, struct imsgbuf *);
588 const struct got_error *got_privsep_send_send_req(struct imsgbuf *, int,
589     struct got_pathlist_head *, struct got_pathlist_head *, int);
590 const struct got_error *got_privsep_recv_send_remote_refs(
591     struct got_pathlist_head *, struct imsgbuf *);
592 const struct got_error *got_privsep_send_packfd(struct imsgbuf *, int);
593 const struct got_error *got_privsep_recv_send_progress(int *, off_t *,
594     int *, char **, struct imsgbuf *);
595 const struct got_error *got_privsep_get_imsg_obj(struct got_object **,
596     struct imsg *, struct imsgbuf *);
597 const struct got_error *got_privsep_recv_obj(struct got_object **,
598     struct imsgbuf *);
599 const struct got_error *got_privsep_send_raw_obj(struct imsgbuf *, off_t,
600     size_t, uint8_t *);
601 const struct got_error *got_privsep_recv_raw_obj(uint8_t **, off_t *, size_t *,
602     struct imsgbuf *);
603 const struct got_error *got_privsep_send_commit(struct imsgbuf *,
604     struct got_commit_object *);
605 const struct got_error *got_privsep_recv_commit(struct got_commit_object **,
606     struct imsgbuf *);
607 const struct got_error *got_privsep_recv_tree(struct got_tree_object **,
608     struct imsgbuf *);
609 const struct got_error *got_privsep_send_tree(struct imsgbuf *,
610     struct got_pathlist_head *, int);
611 const struct got_error *got_privsep_send_blob(struct imsgbuf *, size_t, size_t,
612     const uint8_t *);
613 const struct got_error *got_privsep_recv_blob(uint8_t **, size_t *, size_t *,
614     struct imsgbuf *);
615 const struct got_error *got_privsep_send_tag(struct imsgbuf *,
616     struct got_tag_object *);
617 const struct got_error *got_privsep_recv_tag(struct got_tag_object **,
618     struct imsgbuf *);
619 const struct got_error *got_privsep_init_pack_child(struct imsgbuf *,
620     struct got_pack *, struct got_packidx *);
621 const struct got_error *got_privsep_send_packed_obj_req(struct imsgbuf *, int,
622     struct got_object_id *);
623 const struct got_error *got_privsep_send_packed_raw_obj_req(struct imsgbuf *,
624     int, struct got_object_id *);
625 const struct got_error *got_privsep_send_pack_child_ready(struct imsgbuf *);
626 
627 const struct got_error *got_privsep_send_gitconfig_parse_req(struct imsgbuf *,
628     int);
629 const struct got_error *
630     got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *);
631 const struct got_error *got_privsep_send_gitconfig_repository_extensions_req(
632     struct imsgbuf *);
633 const struct got_error *got_privsep_send_gitconfig_author_name_req(
634     struct imsgbuf *);
635 const struct got_error *got_privsep_send_gitconfig_author_email_req(
636     struct imsgbuf *);
637 const struct got_error *got_privsep_send_gitconfig_remotes_req(
638     struct imsgbuf *);
639 const struct got_error *got_privsep_send_gitconfig_owner_req(struct imsgbuf *);
640 const struct got_error *got_privsep_recv_gitconfig_str(char **,
641     struct imsgbuf *);
642 const struct got_error *got_privsep_recv_gitconfig_int(int *, struct imsgbuf *);
643 const struct got_error *got_privsep_recv_gitconfig_remotes(
644     struct got_remote_repo **, int *, struct imsgbuf *);
645 
646 const struct got_error *got_privsep_send_gotconfig_parse_req(struct imsgbuf *,
647     int);
648 const struct got_error *got_privsep_send_gotconfig_author_req(struct imsgbuf *);
649 const struct got_error *got_privsep_send_gotconfig_remotes_req(
650     struct imsgbuf *);
651 const struct got_error *got_privsep_recv_gotconfig_str(char **,
652     struct imsgbuf *);
653 const struct got_error *got_privsep_recv_gotconfig_remotes(
654     struct got_remote_repo **, int *, struct imsgbuf *);
655 
656 const struct got_error *got_privsep_send_commit_traversal_request(
657     struct imsgbuf *, struct got_object_id *, int, const char *);
658 const struct got_error *got_privsep_recv_traversed_commits(
659     struct got_commit_object **, struct got_object_id **,
660     struct got_object_id_queue *, struct imsgbuf *);
661 
662 const struct got_error *got_privsep_send_raw_delta_req(struct imsgbuf *, int,
663     struct got_object_id *);
664 const struct got_error *got_privsep_send_raw_delta_outfd(struct imsgbuf *, int);
665 const struct got_error *got_privsep_send_raw_delta(struct imsgbuf *, uint64_t,
666     uint64_t,  off_t, off_t, off_t, off_t, struct got_object_id *);
667 const struct got_error *got_privsep_recv_raw_delta(uint64_t *, uint64_t *,
668     off_t *, off_t *, off_t *, off_t *, struct got_object_id **,
669     struct imsgbuf *);
670 
671 void got_privsep_exec_child(int[2], const char *, const char *);