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