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_ENTRIES,
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 	GOT_IMSG_OBJECT_ENUMERATION_REQUEST,
149 	GOT_IMSG_ENUMERATED_COMMIT,
150 	GOT_IMSG_ENUMERATED_TREE,
151 	GOT_IMSG_TREE_ENUMERATION_DONE,
152 	GOT_IMSG_OBJECT_ENUMERATION_DONE,
153 	GOT_IMSG_OBJECT_ENUMERATION_INCOMPLETE,
154 
155 	/* Message sending file descriptor to a temporary file. */
156 	GOT_IMSG_TMPFD,
157 
158 	/* Messages related to gitconfig files. */
159 	GOT_IMSG_GITCONFIG_PARSE_REQUEST,
160 	GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST,
161 	GOT_IMSG_GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST,
162 	GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST,
163 	GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST,
164 	GOT_IMSG_GITCONFIG_REMOTES_REQUEST,
165 	GOT_IMSG_GITCONFIG_INT_VAL,
166 	GOT_IMSG_GITCONFIG_STR_VAL,
167 	GOT_IMSG_GITCONFIG_REMOTES,
168 	GOT_IMSG_GITCONFIG_REMOTE,
169 	GOT_IMSG_GITCONFIG_OWNER_REQUEST,
170 	GOT_IMSG_GITCONFIG_OWNER,
171 
172 	/* Messages related to gotconfig files. */
173 	GOT_IMSG_GOTCONFIG_PARSE_REQUEST,
174 	GOT_IMSG_GOTCONFIG_AUTHOR_REQUEST,
175 	GOT_IMSG_GOTCONFIG_ALLOWEDSIGNERS_REQUEST,
176 	GOT_IMSG_GOTCONFIG_REVOKEDSIGNERS_REQUEST,
177 	GOT_IMSG_GOTCONFIG_SIGNERID_REQUEST,
178 	GOT_IMSG_GOTCONFIG_REMOTES_REQUEST,
179 	GOT_IMSG_GOTCONFIG_INT_VAL,
180 	GOT_IMSG_GOTCONFIG_STR_VAL,
181 	GOT_IMSG_GOTCONFIG_REMOTES,
182 	GOT_IMSG_GOTCONFIG_REMOTE,
183 
184 	/* Raw object access. Uncompress object data but do not parse it. */
185 	GOT_IMSG_RAW_OBJECT_REQUEST,
186 	GOT_IMSG_RAW_OBJECT_OUTFD,
187 	GOT_IMSG_PACKED_RAW_OBJECT_REQUEST,
188 	GOT_IMSG_RAW_OBJECT,
189 
190 	/* Read raw delta data from pack files. */
191 	GOT_IMSG_RAW_DELTA_OUTFD,
192 	GOT_IMSG_RAW_DELTA_REQUEST,
193 	GOT_IMSG_RAW_DELTA,
194 
195 	/* Re-use deltas found in a pack file. */
196 	GOT_IMSG_DELTA_REUSE_REQUEST,
197 	GOT_IMSG_REUSED_DELTAS,
198 	GOT_IMSG_DELTA_REUSE_DONE,
199 
200 	/* Commit coloring in got-read-pack. */
201 	GOT_IMSG_COMMIT_PAINTING_INIT,
202 	GOT_IMSG_COMMIT_PAINTING_REQUEST,
203 	GOT_IMSG_PAINTED_COMMITS,
204 	GOT_IMSG_COMMIT_PAINTING_DONE,
205 
206 	/* Transfer a list of object IDs. */
207 	GOT_IMSG_OBJ_ID_LIST,
208 	GOT_IMSG_OBJ_ID_LIST_DONE,
209 
210 	/* Messages related to patch files. */
211 	GOT_IMSG_PATCH_FILE,
212 	GOT_IMSG_PATCH_HUNK,
213 	GOT_IMSG_PATCH_DONE,
214 	GOT_IMSG_PATCH_LINE,
215 	GOT_IMSG_PATCH,
216 	GOT_IMSG_PATCH_EOF,
217 };
218 
219 /* Structure for GOT_IMSG_ERROR. */
220 struct got_imsg_error {
221 	int code; /* an error code from got_error.h */
222 	int errno_code; /* in case code equals GOT_ERR_ERRNO */
223 } __attribute__((__packed__));
224 
225 /*
226  * Structure for GOT_IMSG_TREE_REQUEST and GOT_IMSG_OBJECT data.
227  */
228 struct got_imsg_object {
229 	uint8_t id[SHA1_DIGEST_LENGTH];
230 
231 	/* These fields are the same as in struct got_object. */
232 	int type;
233 	int flags;
234 	size_t hdrlen;
235 	size_t size;
236 	off_t pack_offset;
237 	int pack_idx;
238 }  __attribute__((__packed__));
239 
240 /* Structure for GOT_IMSG_COMMIT data. */
241 struct got_imsg_commit_object {
242 	uint8_t tree_id[SHA1_DIGEST_LENGTH];
243 	size_t author_len;
244 	time_t author_time;
245 	time_t author_gmtoff;
246 	size_t committer_len;
247 	time_t committer_time;
248 	time_t committer_gmtoff;
249 	size_t logmsg_len;
250 	int nparents;
251 
252 	/*
253 	 * Followed by author_len + committer_len data bytes
254 	 */
255 
256 	/* Followed by 'nparents' SHA1_DIGEST_LENGTH length strings */
257 
258 	/*
259 	 * Followed by 'logmsg_len' bytes of commit log message data in
260 	 * one or more GOT_IMSG_COMMIT_LOGMSG messages.
261 	 */
262 } __attribute__((__packed__));
263 
264 struct got_imsg_tree_entry {
265 	char id[SHA1_DIGEST_LENGTH];
266 	mode_t mode;
267 	size_t namelen;
268 	/* Followed by namelen bytes of entry's name, not NUL-terminated. */
269 } __attribute__((__packed__));
270 
271 /* Structure for GOT_IMSG_TREE_ENTRIES. */
272 struct got_imsg_tree_entries {
273 	size_t nentries; /* Number of tree entries contained in this message. */
274 
275 	/* Followed by nentries * struct got_imsg_tree_entry */
276 };
277 
278 /* Structure for GOT_IMSG_TREE_OBJECT_REPLY data. */
279 struct got_imsg_tree_object {
280 	int nentries; /* This many tree entries follow. */
281 };
282 
283 /* Structure for GOT_IMSG_BLOB. */
284 struct got_imsg_blob {
285 	size_t size;
286 	size_t hdrlen;
287 
288 	/*
289 	 * If size <= GOT_PRIVSEP_INLINE_BLOB_DATA_MAX, blob data follows
290 	 * in the imsg buffer. Otherwise, blob data has been written to a
291 	 * file descriptor passed via the GOT_IMSG_BLOB_OUTFD imsg.
292 	 */
293 #define GOT_PRIVSEP_INLINE_BLOB_DATA_MAX \
294 	(MAX_IMSGSIZE - IMSG_HEADER_SIZE - sizeof(struct got_imsg_blob))
295 };
296 
297 /* Structure for GOT_IMSG_RAW_OBJECT. */
298 struct got_imsg_raw_obj {
299 	off_t size;
300 	size_t hdrlen;
301 
302 	/*
303 	 * If size <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX, object data follows
304 	 * in the imsg buffer. Otherwise, object data has been written to a
305 	 * file descriptor passed via the GOT_IMSG_RAW_OBJECT_OUTFD imsg.
306 	 */
307 #define GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX \
308 	(MAX_IMSGSIZE - IMSG_HEADER_SIZE - sizeof(struct got_imsg_raw_obj))
309 };
310 
311 /* Structure for GOT_IMSG_RAW_DELTA. */
312 struct got_imsg_raw_delta {
313 	uint8_t base_id[SHA1_DIGEST_LENGTH];
314 	uint64_t base_size;
315 	uint64_t result_size;
316 	off_t delta_size;
317 	off_t delta_compressed_size;
318 	off_t delta_offset;
319 	off_t delta_out_offset;
320 
321 	/*
322 	 * Delta data has been written at delta_out_offset to the file
323 	 * descriptor passed via the GOT_IMSG_RAW_DELTA_OUTFD imsg.
324 	 */
325 };
326 
327 /* Structures for GOT_IMSG_REUSED_DELTAS. */
328 struct got_imsg_reused_delta {
329 	struct got_object_id id;
330 	struct got_object_id base_id;
331 	uint64_t base_size;
332 	uint64_t result_size;
333 	off_t delta_size;
334 	off_t delta_compressed_size;
335 	off_t delta_offset;
336 	off_t delta_out_offset;
337 
338 	/*
339 	 * Delta data has been written at delta_out_offset to the file
340 	 * descriptor passed via the GOT_IMSG_RAW_DELTA_OUTFD imsg.
341 	 */
342 };
343 struct got_imsg_reused_deltas {
344 	size_t ndeltas;
345 
346 	/*
347 	 * Followed by ndeltas * struct got_imsg_reused_delta.
348 	 */
349 
350 #define GOT_IMSG_REUSED_DELTAS_MAX_NDELTAS \
351 	((MAX_IMSGSIZE - IMSG_HEADER_SIZE - \
352 	sizeof(struct got_imsg_reused_deltas)) \
353 	/ sizeof(struct got_imsg_reused_delta))
354 };
355 
356 /* Structure for GOT_IMSG_COMMIT_PAINTING_REQUEST. */
357 struct got_imsg_commit_painting_request {
358 	uint8_t id[SHA1_DIGEST_LENGTH];
359 	int idx;
360 	int color;
361 } __attribute__((__packed__));
362 
363 /* Structure for GOT_IMSG_PAINTED_COMMITS. */
364 struct got_imsg_painted_commit {
365 	uint8_t id[SHA1_DIGEST_LENGTH];
366 	intptr_t color;
367 } __attribute__((__packed__));
368 
369 struct got_imsg_painted_commits {
370 	int ncommits;
371 	int present_in_pack;
372 	/*
373 	 * Followed by ncommits * struct got_imsg_painted_commit.
374 	 */
375 } __attribute__((__packed__));
376 
377 /* Structure for GOT_IMSG_TAG data. */
378 struct got_imsg_tag_object {
379 	uint8_t id[SHA1_DIGEST_LENGTH];
380 	int obj_type;
381 	size_t tag_len;
382 	size_t tagger_len;
383 	time_t tagger_time;
384 	time_t tagger_gmtoff;
385 	size_t tagmsg_len;
386 
387 	/*
388 	 * Followed by tag_len + tagger_len data bytes
389 	 */
390 
391 	/*
392 	 * Followed by 'tagmsg_len' bytes of tag message data in
393 	 * one or more GOT_IMSG_TAG_TAGMSG messages.
394 	 */
395 } __attribute__((__packed__));
396 
397 /* Structure for GOT_IMSG_FETCH_HAVE_REF data. */
398 struct got_imsg_fetch_have_ref {
399 	uint8_t id[SHA1_DIGEST_LENGTH];
400 	size_t name_len;
401 	/* Followed by name_len data bytes. */
402 } __attribute__((__packed__));
403 
404 /* Structure for GOT_IMSG_FETCH_WANTED_BRANCH data. */
405 struct got_imsg_fetch_wanted_branch {
406 	size_t name_len;
407 	/* Followed by name_len data bytes. */
408 } __attribute__((__packed__));
409 
410 /* Structure for GOT_IMSG_FETCH_WANTED_REF data. */
411 struct got_imsg_fetch_wanted_ref {
412 	size_t name_len;
413 	/* Followed by name_len data bytes. */
414 } __attribute__((__packed__));
415 
416 /* Structure for GOT_IMSG_FETCH_REQUEST data. */
417 struct got_imsg_fetch_request {
418 	int fetch_all_branches;
419 	int list_refs_only;
420 	int verbosity;
421 	size_t n_have_refs;
422 	size_t n_wanted_branches;
423 	size_t n_wanted_refs;
424 	/* Followed by n_have_refs GOT_IMSG_FETCH_HAVE_REF messages. */
425 	/* Followed by n_wanted_branches times GOT_IMSG_FETCH_WANTED_BRANCH. */
426 	/* Followed by n_wanted_refs times GOT_IMSG_FETCH_WANTED_REF. */
427 } __attribute__((__packed__));
428 
429 /* Structures for GOT_IMSG_FETCH_SYMREFS data. */
430 struct got_imsg_fetch_symref {
431 	size_t name_len;
432 	size_t target_len;
433 
434 	/*
435 	 * Followed by name_len + target_len data bytes.
436 	 */
437 } __attribute__((__packed__));
438 
439 struct got_imsg_fetch_symrefs {
440 	size_t nsymrefs;
441 
442 	/* Followed by nsymrefs times of got_imsg_fetch_symref data. */
443 } __attribute__((__packed__));
444 
445 /* Structure for GOT_IMSG_FETCH_REF data. */
446 struct got_imsg_fetch_ref {
447 	/* Describes a reference which will be fetched. */
448 	uint8_t refid[SHA1_DIGEST_LENGTH];
449 	/* Followed by reference name in remaining data of imsg buffer. */
450 };
451 
452 /* Structure for GOT_IMSG_FETCH_DOWNLOAD_PROGRESS data. */
453 struct got_imsg_fetch_download_progress {
454 	/* Number of packfile data bytes downloaded so far. */
455 	off_t packfile_bytes;
456 };
457 
458 /* Structure for GOT_IMSG_SEND_REQUEST data. */
459 struct got_imsg_send_request {
460 	int verbosity;
461 	size_t nrefs;
462 	/* Followed by nrefs GOT_IMSG_SEND_REF messages. */
463 } __attribute__((__packed__));
464 
465 /* Structure for GOT_IMSG_SEND_UPLOAD_PROGRESS data. */
466 struct got_imsg_send_upload_progress {
467 	/* Number of packfile data bytes uploaded so far. */
468 	off_t packfile_bytes;
469 };
470 
471 /* Structure for GOT_IMSG_SEND_REF data. */
472 struct got_imsg_send_ref {
473 	uint8_t id[SHA1_DIGEST_LENGTH];
474 	int delete;
475 	size_t name_len;
476 	/* Followed by name_len data bytes. */
477 } __attribute__((__packed__));
478 
479 /* Structure for GOT_IMSG_SEND_REMOTE_REF data. */
480 struct got_imsg_send_remote_ref {
481 	uint8_t id[SHA1_DIGEST_LENGTH];
482 	size_t name_len;
483 	/* Followed by name_len data bytes. */
484 } __attribute__((__packed__));
485 
486 /* Structure for GOT_IMSG_SEND_REF_STATUS data. */
487 struct got_imsg_send_ref_status {
488 	int success;
489 	size_t name_len;
490 	/* Followed by name_len data bytes. */
491 } __attribute__((__packed__));
492 
493 /* Structure for GOT_IMSG_IDXPACK_REQUEST data. */
494 struct got_imsg_index_pack_request {
495 	uint8_t pack_hash[SHA1_DIGEST_LENGTH];
496 } __attribute__((__packed__));
497 
498 /* Structure for GOT_IMSG_IDXPACK_PROGRESS data. */
499 struct got_imsg_index_pack_progress {
500 	/* Total number of objects in pack file. */
501 	int nobj_total;
502 
503 	/* Number of objects indexed so far. */
504 	int nobj_indexed;
505 
506 	/* Number of non-deltified objects in pack file. */
507 	int nobj_loose;
508 
509 	/* Number of deltified objects resolved so far. */
510 	int nobj_resolved;
511 };
512 
513 /* Structure for GOT_IMSG_PACKIDX. */
514 struct got_imsg_packidx {
515 	size_t len;
516 	off_t packfile_size;
517 	/* Additionally, a file desciptor is passed via imsg. */
518 };
519 
520 /* Structure for GOT_IMSG_PACK. */
521 struct got_imsg_pack {
522 	char path_packfile[PATH_MAX];
523 	size_t filesize;
524 	/* Additionally, a file desciptor is passed via imsg. */
525 } __attribute__((__packed__));
526 
527 /*
528  * Structure for GOT_IMSG_OBJECT_REQUEST, GOT_IMSG_BLOB_REQUEST,
529  * GOT_IMSG_TREE_REQUEST, GOT_IMSG_COMMIT_REQUEST, and
530  * GOT_IMSG_TAG_REQUEST data.
531  */
532 struct got_object_id;
533 
534 /*
535  * Structure for GOT_IMSG_PACKED_OBJECT_REQUEST and
536  * GOT_IMSG_PACKED_RAW_OBJECT_REQUEST data.
537  */
538 struct got_imsg_packed_object {
539 	uint8_t id[SHA1_DIGEST_LENGTH];
540 	int idx;
541 } __attribute__((__packed__));
542 
543 /*
544  * Structure for GOT_IMSG_DELTA data.
545  */
546 struct got_imsg_delta {
547 	/* These fields are the same as in struct got_delta. */
548 	off_t offset;
549 	size_t tslen;
550 	int type;
551 	size_t size;
552 	off_t data_offset;
553 };
554 
555 /*
556  * Structure for GOT_IMSG_RAW_DELTA_REQUEST data.
557  */
558 struct got_imsg_raw_delta_request {
559 	uint8_t id[SHA1_DIGEST_LENGTH];
560 	int idx;
561 };
562 
563 /*
564  * Structure for GOT_IMSG_OBJ_ID_LIST data.
565  * Multiple such messages may be sent back-to-back, where each message
566  * contains a chunk of IDs. The entire list must be terminated with a
567  * GOT_IMSG_OBJ_ID_LIST_DONE message.
568  */
569 struct got_imsg_object_idlist {
570 	size_t nids;
571 
572 	/*
573 	 * Followed by nids * struct got_object_id.
574 	 */
575 
576 #define GOT_IMSG_OBJ_ID_LIST_MAX_NIDS \
577 	((MAX_IMSGSIZE - IMSG_HEADER_SIZE - \
578 	sizeof(struct got_imsg_object_idlist)) / sizeof(struct got_object_id))
579 };
580 
581 /* Structure for GOT_IMSG_COMMIT_TRAVERSAL_REQUEST  */
582 struct got_imsg_commit_traversal_request {
583 	uint8_t id[SHA1_DIGEST_LENGTH];
584 	int idx;
585 	size_t path_len;
586 	/* Followed by path_len bytes of path data */
587 } __attribute__((__packed__));
588 
589 /* Structure for GOT_IMSG_TRAVERSED_COMMITS  */
590 struct got_imsg_traversed_commits {
591 	size_t ncommits;
592 	/* Followed by ncommit IDs of SHA1_DIGEST_LENGTH each */
593 } __attribute__((__packed__));
594 
595 /* Structure for GOT_IMSG_ENUMERATED_COMMIT  */
596 struct got_imsg_enumerated_commit {
597 	uint8_t id[SHA1_DIGEST_LENGTH];
598 	time_t mtime;
599 } __attribute__((__packed__));
600 
601 /* Structure for GOT_IMSG_ENUMERATED_TREE */
602 struct got_imsg_enumerated_tree {
603 	uint8_t id[SHA1_DIGEST_LENGTH]; /* tree ID */
604 	int nentries;			/* number of tree entries */
605 
606 	/* Followed by tree's path in remaining data of imsg buffer. */
607 
608 	/* Followed by nentries * GOT_IMSG_TREE_ENTRY messages. */
609 } __attribute__((__packed__));
610 
611 /*
612  * Structure for GOT_IMSG_GOTCONFIG_REMOTE and
613  * GOT_IMSG_GOTCONFIG_REMOTE data.
614  */
615 struct got_imsg_remote {
616 	size_t name_len;
617 	size_t fetch_url_len;
618 	size_t send_url_len;
619 	int mirror_references;
620 	int fetch_all_branches;
621 	int nfetch_branches;
622 	int nsend_branches;
623 	int nfetch_refs;
624 
625 	/* Followed by name_len data bytes. */
626 	/* Followed by fetch_url_len + send_url_len data bytes. */
627 	/* Followed by nfetch_branches GOT_IMSG_GITCONFIG_STR_VAL messages. */
628 	/* Followed by nsend_branches GOT_IMSG_GITCONFIG_STR_VAL messages. */
629 	/* Followed by nfetch_refs GOT_IMSG_GITCONFIG_STR_VAL messages. */
630 } __attribute__((__packed__));
631 
632 /*
633  * Structure for GOT_IMSG_GITCONFIG_REMOTES data.
634  */
635 struct got_imsg_remotes {
636 	int nremotes; /* This many GOT_IMSG_GITCONFIG_REMOTE messages follow. */
637 };
638 
639 /*
640  * Structure for GOT_IMSG_PATCH data.
641  */
642 struct got_imsg_patch {
643 	int	git;
644 	char	old[PATH_MAX];
645 	char	new[PATH_MAX];
646 	char	cid[41];
647 	char	blob[41];
648 };
649 
650 /*
651  * Structure for GOT_IMSG_PATCH_HUNK data.
652  */
653 struct got_imsg_patch_hunk {
654 	int	oldfrom;
655 	int	oldlines;
656 	int	newfrom;
657 	int	newlines;
658 };
659 
660 struct got_remote_repo;
661 struct got_pack;
662 struct got_packidx;
663 struct got_pathlist_head;
664 
665 const struct got_error *got_send_ack(pid_t);
666 const struct got_error *got_privsep_wait_for_child(pid_t);
667 const struct got_error *got_privsep_flush_imsg(struct imsgbuf *);
668 const struct got_error *got_privsep_send_stop(int);
669 const struct got_error *got_privsep_recv_imsg(struct imsg *, struct imsgbuf *,
670     size_t);
671 void got_privsep_send_error(struct imsgbuf *, const struct got_error *);
672 const struct got_error *got_privsep_send_ack(struct imsgbuf *);
673 const struct got_error *got_privsep_wait_ack(struct imsgbuf *);
674 const struct got_error *got_privsep_send_obj_req(struct imsgbuf *, int,
675     struct got_object_id *);
676 const struct got_error *got_privsep_send_raw_obj_req(struct imsgbuf *, int,
677     struct got_object_id *);
678 const struct got_error *got_privsep_send_raw_obj_outfd(struct imsgbuf *, int);
679 const struct got_error *got_privsep_send_commit_req(struct imsgbuf *, int,
680     struct got_object_id *, int);
681 const struct got_error *got_privsep_send_tree_req(struct imsgbuf *, int,
682     struct got_object_id *, int);
683 const struct got_error *got_privsep_send_tag_req(struct imsgbuf *, int,
684     struct got_object_id *, int);
685 const struct got_error *got_privsep_send_blob_req(struct imsgbuf *, int,
686     struct got_object_id *, int);
687 const struct got_error *got_privsep_send_blob_outfd(struct imsgbuf *, int);
688 const struct got_error *got_privsep_send_tmpfd(struct imsgbuf *, int);
689 const struct got_error *got_privsep_send_obj(struct imsgbuf *,
690     struct got_object *);
691 const struct got_error *got_privsep_send_index_pack_req(struct imsgbuf *,
692     uint8_t *, int);
693 const struct got_error *got_privsep_send_index_pack_outfd(struct imsgbuf *,
694     int);
695 const struct got_error *got_privsep_recv_index_progress(int *, int *, int *,
696     int *, int *, struct imsgbuf *ibuf);
697 const struct got_error *got_privsep_send_fetch_req(struct imsgbuf *, int,
698     struct got_pathlist_head *, int, struct got_pathlist_head *,
699     struct got_pathlist_head *, int, int);
700 const struct got_error *got_privsep_send_fetch_outfd(struct imsgbuf *, int);
701 const struct got_error *got_privsep_recv_fetch_progress(int *,
702     struct got_object_id **, char **, struct got_pathlist_head *, char **,
703     off_t *, uint8_t *, struct imsgbuf *);
704 const struct got_error *got_privsep_send_send_req(struct imsgbuf *, int,
705     struct got_pathlist_head *, struct got_pathlist_head *, int);
706 const struct got_error *got_privsep_recv_send_remote_refs(
707     struct got_pathlist_head *, struct imsgbuf *);
708 const struct got_error *got_privsep_send_packfd(struct imsgbuf *, int);
709 const struct got_error *got_privsep_recv_send_progress(int *, off_t *,
710     int *, char **, struct imsgbuf *);
711 const struct got_error *got_privsep_get_imsg_obj(struct got_object **,
712     struct imsg *, struct imsgbuf *);
713 const struct got_error *got_privsep_recv_obj(struct got_object **,
714     struct imsgbuf *);
715 const struct got_error *got_privsep_send_raw_obj(struct imsgbuf *, off_t,
716     size_t, uint8_t *);
717 const struct got_error *got_privsep_recv_raw_obj(uint8_t **, off_t *, size_t *,
718     struct imsgbuf *);
719 const struct got_error *got_privsep_send_commit(struct imsgbuf *,
720     struct got_commit_object *);
721 const struct got_error *got_privsep_recv_commit(struct got_commit_object **,
722     struct imsgbuf *);
723 const struct got_error *got_privsep_recv_tree(struct got_tree_object **,
724     struct imsgbuf *);
725 struct got_parsed_tree_entry;
726 const struct got_error *got_privsep_send_tree(struct imsgbuf *,
727     struct got_parsed_tree_entry *, int);
728 const struct got_error *got_privsep_send_blob(struct imsgbuf *, size_t, size_t,
729     const uint8_t *);
730 const struct got_error *got_privsep_recv_blob(uint8_t **, size_t *, size_t *,
731     struct imsgbuf *);
732 const struct got_error *got_privsep_send_tag(struct imsgbuf *,
733     struct got_tag_object *);
734 const struct got_error *got_privsep_recv_tag(struct got_tag_object **,
735     struct imsgbuf *);
736 const struct got_error *got_privsep_init_pack_child(struct imsgbuf *,
737     struct got_pack *, struct got_packidx *);
738 const struct got_error *got_privsep_send_packed_obj_req(struct imsgbuf *, int,
739     struct got_object_id *);
740 const struct got_error *got_privsep_send_packed_raw_obj_req(struct imsgbuf *,
741     int, struct got_object_id *);
742 const struct got_error *got_privsep_send_pack_child_ready(struct imsgbuf *);
743 
744 const struct got_error *got_privsep_send_gitconfig_parse_req(struct imsgbuf *,
745     int);
746 const struct got_error *
747     got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *);
748 const struct got_error *got_privsep_send_gitconfig_repository_extensions_req(
749     struct imsgbuf *);
750 const struct got_error *got_privsep_send_gitconfig_author_name_req(
751     struct imsgbuf *);
752 const struct got_error *got_privsep_send_gitconfig_author_email_req(
753     struct imsgbuf *);
754 const struct got_error *got_privsep_send_gitconfig_remotes_req(
755     struct imsgbuf *);
756 const struct got_error *got_privsep_send_gitconfig_owner_req(struct imsgbuf *);
757 const struct got_error *got_privsep_recv_gitconfig_str(char **,
758     struct imsgbuf *);
759 const struct got_error *got_privsep_recv_gitconfig_int(int *, struct imsgbuf *);
760 const struct got_error *got_privsep_recv_gitconfig_remotes(
761     struct got_remote_repo **, int *, struct imsgbuf *);
762 
763 const struct got_error *got_privsep_send_gotconfig_parse_req(struct imsgbuf *,
764     int);
765 const struct got_error *got_privsep_send_gotconfig_author_req(struct imsgbuf *);
766 const struct got_error *got_privsep_send_gotconfig_allowed_signers_req(
767     struct imsgbuf *);
768 const struct got_error *got_privsep_send_gotconfig_revoked_signers_req(
769     struct imsgbuf *);
770 const struct got_error *got_privsep_send_gotconfig_signer_id_req(
771     struct imsgbuf *);
772 const struct got_error *got_privsep_send_gotconfig_remotes_req(
773     struct imsgbuf *);
774 const struct got_error *got_privsep_recv_gotconfig_str(char **,
775     struct imsgbuf *);
776 const struct got_error *got_privsep_recv_gotconfig_remotes(
777     struct got_remote_repo **, int *, struct imsgbuf *);
778 
779 const struct got_error *got_privsep_send_commit_traversal_request(
780     struct imsgbuf *, struct got_object_id *, int, const char *);
781 const struct got_error *got_privsep_recv_traversed_commits(
782     struct got_commit_object **, struct got_object_id **,
783     struct got_object_id_queue *, struct imsgbuf *);
784 const struct got_error *got_privsep_send_enumerated_tree(size_t *,
785     struct imsgbuf *, struct got_object_id *, const char *,
786     struct got_parsed_tree_entry *, int);
787 const struct got_error *got_privsep_send_object_enumeration_request(
788     struct imsgbuf *);
789 const struct got_error *got_privsep_send_object_enumeration_done(
790     struct imsgbuf *);
791 const struct got_error *got_privsep_send_object_enumeration_incomplete(
792     struct imsgbuf *);
793 const struct got_error *got_privsep_send_enumerated_commit(struct imsgbuf *,
794     struct got_object_id *, time_t);
795 const struct got_error *got_privsep_recv_enumerated_objects(int *,
796     struct imsgbuf *, got_object_enumerate_commit_cb,
797     got_object_enumerate_tree_cb, void *, struct got_repository *);
798 
799 const struct got_error *got_privsep_send_raw_delta_req(struct imsgbuf *, int,
800     struct got_object_id *);
801 const struct got_error *got_privsep_send_raw_delta_outfd(struct imsgbuf *, int);
802 const struct got_error *got_privsep_send_raw_delta(struct imsgbuf *, uint64_t,
803     uint64_t,  off_t, off_t, off_t, off_t, struct got_object_id *);
804 const struct got_error *got_privsep_recv_raw_delta(uint64_t *, uint64_t *,
805     off_t *, off_t *, off_t *, off_t *, struct got_object_id **,
806     struct imsgbuf *);
807 
808 const struct got_error *got_privsep_send_object_idlist(struct imsgbuf *,
809     struct got_object_id **, size_t);
810 const struct got_error *got_privsep_send_object_idlist_done(struct imsgbuf *);
811 const struct got_error *got_privsep_recv_object_idlist(int *,
812     struct got_object_id **, size_t *, struct imsgbuf *);
813 
814 const struct got_error *got_privsep_send_delta_reuse_req(struct imsgbuf *);
815 const struct got_error *got_privsep_send_reused_deltas(struct imsgbuf *,
816     struct got_imsg_reused_delta *, size_t);
817 const struct got_error *got_privsep_send_reused_deltas_done(struct imsgbuf *);
818 const struct got_error *got_privsep_recv_reused_deltas(int *, 
819     struct got_imsg_reused_delta *, size_t *, struct imsgbuf *);
820 
821 const struct got_error *got_privsep_init_commit_painting(struct imsgbuf *);
822 const struct got_error *got_privsep_send_painting_request(struct imsgbuf *,
823     int, struct got_object_id *, intptr_t);
824 typedef const struct got_error *(*got_privsep_recv_painted_commit_cb)(void *,
825     struct got_object_id *, intptr_t);
826 const struct got_error *got_privsep_send_painted_commits(struct imsgbuf *,
827     struct got_object_id_queue *, int *, int, int);
828 const struct got_error *got_privsep_send_painting_commits_done(struct imsgbuf *);
829 const struct got_error *got_privsep_recv_painted_commits(
830     struct got_object_id_queue *, got_privsep_recv_painted_commit_cb, void *,
831     struct imsgbuf *);
832 
833 void got_privsep_exec_child(int[2], const char *, const char *);