1 /*
2  * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/types.h>
18 #include <sys/queue.h>
19 #include <sys/uio.h>
20 #include <sys/time.h>
21 #include <sys/limits.h>
22 #include <sys/syslimits.h>
23 #include <sys/mman.h>
24 
25 #include <limits.h>
26 #include <stdint.h>
27 #include <imsg.h>
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <string.h>
31 #include <sha1.h>
32 #include <zlib.h>
33 
34 #include "got_error.h"
35 #include "got_object.h"
36 
37 #include "got_lib_delta.h"
38 #include "got_lib_inflate.h"
39 #include "got_lib_object.h"
40 #include "got_lib_object_parse.h"
41 #include "got_lib_privsep.h"
42 #include "got_lib_pack.h"
43 
44 static const struct got_error *
45 object_request(struct imsg *imsg, struct imsgbuf *ibuf, struct got_pack *pack,
46     struct got_packidx *packidx)
47 {
48 	const struct got_error *err = NULL;
49 	struct got_imsg_packed_object iobj;
50 	struct got_object *obj;
51 	size_t datalen;
52 
53 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
54 	if (datalen != sizeof(iobj))
55 		return got_error(GOT_ERR_PRIVSEP_LEN);
56 	memcpy(&iobj, imsg->data, sizeof(iobj));
57 
58 	err = got_packfile_open_object(&obj, pack, packidx, iobj.idx, NULL);
59 	if (err)
60 		return err;
61 
62 	err = got_privsep_send_obj(ibuf, obj);
63 	got_object_close(obj);
64 	return err;
65 }
66 
67 static const struct got_error *
68 commit_request(struct imsg *imsg, struct imsgbuf *ibuf, struct got_pack *pack,
69     struct got_packidx *packidx)
70 {
71 	const struct got_error *err = NULL;
72 	struct got_object *obj = NULL;
73 	struct got_commit_object *commit = NULL;
74 	uint8_t *buf;
75 	size_t len;
76 
77 	err = got_privsep_get_imsg_obj(&obj, imsg, ibuf);
78 	if (err)
79 		return err;
80 
81 	if (obj->type != GOT_OBJ_TYPE_COMMIT)
82 		return got_error(GOT_ERR_OBJ_TYPE);
83 
84 	err = got_packfile_extract_object_to_mem(&buf, &len, obj, pack);
85 	if (err)
86 		return err;
87 
88 	obj->size = len;
89 	err = got_object_parse_commit(&commit, buf, len);
90 	free(buf);
91 
92 	err = got_privsep_send_commit(ibuf, commit);
93 	if (obj)
94 		got_object_close(obj);
95 	got_object_commit_close(commit);
96 	if (err) {
97 		if (err->code == GOT_ERR_PRIVSEP_PIPE)
98 			err = NULL;
99 		else
100 			got_privsep_send_error(ibuf, err);
101 	}
102 
103 	return err;
104 }
105 
106 static const struct got_error *
107 tree_request(struct imsg *imsg, struct imsgbuf *ibuf, struct got_pack *pack,
108     struct got_packidx *packidx)
109 {
110 	return got_error(GOT_ERR_NOT_IMPL);
111 }
112 
113 static const struct got_error *
114 blob_request(struct imsg *imsg, struct imsgbuf *ibuf, struct got_pack *pack,
115     struct got_packidx *packidx)
116 {
117 	return got_error(GOT_ERR_NOT_IMPL);
118 }
119 
120 static const struct got_error *
121 receive_packidx(struct got_packidx **packidx, struct imsgbuf *ibuf)
122 {
123 	const struct got_error *err = NULL;
124 	struct imsg imsg;
125 	struct got_imsg_packidx ipackidx;
126 	size_t datalen;
127 	struct got_packidx *p;
128 
129 	*packidx = NULL;
130 
131 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
132 	if (err)
133 		return err;
134 
135 	p = calloc(1, sizeof(*p));
136 	if (p == NULL) {
137 		err = got_error_from_errno();
138 		goto done;
139 	}
140 
141 	if (imsg.hdr.type != GOT_IMSG_PACKIDX) {
142 		err = got_error(GOT_ERR_PRIVSEP_MSG);
143 		goto done;
144 	}
145 
146 	if (imsg.fd == -1) {
147 		err = got_error(GOT_ERR_PRIVSEP_NO_FD);
148 		goto done;
149 	}
150 
151 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
152 	if (datalen != sizeof(ipackidx)) {
153 		err = got_error(GOT_ERR_PRIVSEP_LEN);
154 		goto done;
155 	}
156 	memcpy(&ipackidx, imsg.data, sizeof(ipackidx));
157 
158 	p->len = ipackidx.len;
159 	p->fd = dup(imsg.fd);
160 	if (p->fd == -1) {
161 		err = got_error_from_errno();
162 		goto done;
163 	}
164 
165 #ifndef GOT_PACK_NO_MMAP
166 	p->map = mmap(NULL, p->len, PROT_READ, MAP_PRIVATE, p->fd, 0);
167 	if (p->map == MAP_FAILED)
168 		p->map = NULL; /* fall back to read(2) */
169 #endif
170 	err = got_packidx_init_hdr(p, 1);
171 done:
172 	if (err) {
173 		if (imsg.fd != -1)
174 			close(imsg.fd);
175 		got_packidx_close(p);
176 	} else
177 		*packidx = p;
178 	imsg_free(&imsg);
179 	return err;
180 }
181 
182 static const struct got_error *
183 receive_pack(struct got_pack **packp, struct imsgbuf *ibuf)
184 {
185 	const struct got_error *err = NULL;
186 	struct imsg imsg;
187 	struct got_imsg_pack ipack;
188 	size_t datalen;
189 	struct got_pack *pack;
190 
191 	*packp = NULL;
192 
193 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
194 	if (err)
195 		return err;
196 
197 	pack = calloc(1, sizeof(*pack));
198 	if (pack == NULL) {
199 		err = got_error_from_errno();
200 		goto done;
201 	}
202 
203 	if (imsg.hdr.type != GOT_IMSG_PACK) {
204 		err = got_error(GOT_ERR_PRIVSEP_MSG);
205 		goto done;
206 	}
207 
208 	if (imsg.fd == -1) {
209 		err = got_error(GOT_ERR_PRIVSEP_NO_FD);
210 		goto done;
211 	}
212 
213 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
214 	if (datalen != sizeof(ipack)) {
215 		err = got_error(GOT_ERR_PRIVSEP_LEN);
216 		goto done;
217 	}
218 	memcpy(&ipack, imsg.data, sizeof(ipack));
219 
220 	pack->filesize = ipack.filesize;
221 	pack->fd = dup(imsg.fd);
222 	if (pack->fd == -1) {
223 		err = got_error_from_errno();
224 		goto done;
225 	}
226 	pack->path_packfile = strdup(ipack.path_packfile);
227 	if (pack->path_packfile == NULL) {
228 		err = got_error_from_errno();
229 		goto done;
230 	}
231 
232 #ifndef GOT_PACK_NO_MMAP
233 	pack->map = mmap(NULL, pack->filesize, PROT_READ, MAP_PRIVATE,
234 	    pack->fd, 0);
235 	if (pack->map == MAP_FAILED)
236 		pack->map = NULL; /* fall back to read(2) */
237 #endif
238 done:
239 	if (err) {
240 		if (imsg.fd != -1)
241 			close(imsg.fd);
242 		free(pack);
243 	} else
244 		*packp = pack;
245 	imsg_free(&imsg);
246 	return err;
247 }
248 
249 int
250 main(int argc, char *argv[])
251 {
252 	const struct got_error *err = NULL;
253 	struct imsgbuf ibuf;
254 	struct imsg imsg;
255 	struct got_packidx *packidx;
256 	struct got_pack *pack;
257 
258 	//static int attached;
259 	//while (!attached) sleep(1);
260 
261 	imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
262 
263 	/* revoke access to most system calls */
264 	if (pledge("stdio recvfd", NULL) == -1) {
265 		err = got_error_from_errno();
266 		got_privsep_send_error(&ibuf, err);
267 		return 1;
268 	}
269 
270 	err = receive_packidx(&packidx, &ibuf);
271 	if (err) {
272 		got_privsep_send_error(&ibuf, err);
273 		return 1;
274 	}
275 
276 	err = receive_pack(&pack, &ibuf);
277 	if (err) {
278 		got_privsep_send_error(&ibuf, err);
279 		return 1;
280 	}
281 
282 	while (1) {
283 		imsg.fd = -1;
284 
285 		err = got_privsep_recv_imsg(&imsg, &ibuf, 0);
286 		if (err) {
287 			if (err->code == GOT_ERR_PRIVSEP_PIPE)
288 				err = NULL;
289 			break;
290 		}
291 
292 		if (imsg.hdr.type == GOT_IMSG_STOP)
293 			break;
294 
295 		switch (imsg.hdr.type) {
296 		case GOT_IMSG_PACKED_OBJECT_REQUEST:
297 			err = object_request(&imsg, &ibuf, pack, packidx);
298 			break;
299 		case GOT_IMSG_COMMIT_REQUEST:
300 			err = commit_request(&imsg, &ibuf, pack, packidx);
301 			break;
302 		case GOT_IMSG_TREE_REQUEST:
303 			err = tree_request(&imsg, &ibuf, pack, packidx);
304 			break;
305 		case GOT_IMSG_BLOB_REQUEST:
306 			err = blob_request(&imsg, &ibuf, pack, packidx);
307 			break;
308 		default:
309 			err = got_error(GOT_ERR_PRIVSEP_MSG);
310 			break;
311 		}
312 
313 		if (imsg.fd != -1)
314 			close(imsg.fd);
315 		imsg_free(&imsg);
316 		if (err) {
317 			if (err->code == GOT_ERR_PRIVSEP_PIPE)
318 				err = NULL;
319 			else
320 				got_privsep_send_error(&ibuf, err);
321 			break;
322 		}
323 	}
324 
325 	got_pack_close(pack);
326 	imsg_clear(&ibuf);
327 	if (err)
328 		fprintf(stderr, "%s: %s\n", getprogname(), err->msg);
329 	close(GOT_IMSG_FD_CHILD);
330 	return err ? 1 : 0;
331 }