1 /*
2  * Copyright (c) 2019 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/uio.h>
19 #include <sys/time.h>
20 
21 #include <stdint.h>
22 #include <limits.h>
23 #include <signal.h>
24 #include <stdio.h>
25 #include <stdlib.h>
26 #include <string.h>
27 #include <unistd.h>
28 #include <zlib.h>
29 
30 #include "got_compat.h"
31 
32 #include "got_error.h"
33 #include "got_object.h"
34 #include "got_repository.h"
35 
36 #include "got_lib_delta.h"
37 #include "got_lib_object.h"
38 #include "got_lib_privsep.h"
39 #include "got_lib_gitconfig.h"
40 
41 static volatile sig_atomic_t sigint_received;
42 
43 static void
44 catch_sigint(int signo)
45 {
46 	sigint_received = 1;
47 }
48 
49 static const struct got_error *
50 send_gitconfig_int(struct imsgbuf *ibuf, int value)
51 {
52 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_INT_VAL, 0, 0, -1,
53 	    &value, sizeof(value)) == -1)
54 		return got_error_from_errno("imsg_compose GITCONFIG_INT_VAL");
55 
56 	return got_privsep_flush_imsg(ibuf);
57 }
58 
59 static const struct got_error *
60 gitconfig_num_request(struct imsgbuf *ibuf, struct got_gitconfig *gitconfig,
61     const char *section, const char *tag, int def)
62 {
63 	int value;
64 
65 	if (gitconfig == NULL)
66 		return got_error(GOT_ERR_PRIVSEP_MSG);
67 
68 	value = got_gitconfig_get_num(gitconfig, section, tag, def);
69 	return send_gitconfig_int(ibuf, value);
70 }
71 
72 static const struct got_error *
73 send_gitconfig_str(struct imsgbuf *ibuf, const char *value)
74 {
75 	size_t len = value ? strlen(value) : 0;
76 
77 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_STR_VAL, 0, 0, -1,
78 	    value, len) == -1)
79 		return got_error_from_errno("imsg_compose GITCONFIG_STR_VAL");
80 
81 	return got_privsep_flush_imsg(ibuf);
82 }
83 
84 static const struct got_error *
85 gitconfig_str_request(struct imsgbuf *ibuf, struct got_gitconfig *gitconfig,
86     const char *section, const char *tag)
87 {
88 	char *value;
89 
90 	if (gitconfig == NULL)
91 		return got_error(GOT_ERR_PRIVSEP_MSG);
92 
93 	value = got_gitconfig_get_str(gitconfig, section, tag);
94 	return send_gitconfig_str(ibuf, value);
95 }
96 
97 static const struct got_error *
98 send_gitconfig_remotes(struct imsgbuf *ibuf, struct got_remote_repo *remotes,
99     int nremotes)
100 {
101 	const struct got_error *err = NULL;
102 	struct got_imsg_remotes iremotes;
103 	int i;
104 
105 	iremotes.nremotes = nremotes;
106 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_REMOTES, 0, 0, -1,
107 	    &iremotes, sizeof(iremotes)) == -1)
108 		return got_error_from_errno("imsg_compose GITCONFIG_REMOTES");
109 
110 	err = got_privsep_flush_imsg(ibuf);
111 	imsg_clear(ibuf);
112 	if (err)
113 		return err;
114 
115 	for (i = 0; i < nremotes; i++) {
116 		struct got_imsg_remote iremote;
117 		size_t len = sizeof(iremote);
118 		struct ibuf *wbuf;
119 
120 		iremote.mirror_references = remotes[i].mirror_references;
121 		iremote.name_len = strlen(remotes[i].name);
122 		len += iremote.name_len;
123 		iremote.fetch_url_len = strlen(remotes[i].fetch_url);
124 		len += iremote.fetch_url_len;
125 		iremote.send_url_len = strlen(remotes[i].send_url);
126 		len += iremote.send_url_len;
127 
128 		wbuf = imsg_create(ibuf, GOT_IMSG_GITCONFIG_REMOTE, 0, 0, len);
129 		if (wbuf == NULL)
130 			return got_error_from_errno(
131 			    "imsg_create GITCONFIG_REMOTE");
132 
133 		if (imsg_add(wbuf, &iremote, sizeof(iremote)) == -1) {
134 			err = got_error_from_errno(
135 			    "imsg_add GITCONFIG_REMOTE");
136 			ibuf_free(wbuf);
137 			return err;
138 		}
139 
140 		if (imsg_add(wbuf, remotes[i].name, iremote.name_len) == -1) {
141 			err = got_error_from_errno(
142 			    "imsg_add GITCONFIG_REMOTE");
143 			ibuf_free(wbuf);
144 			return err;
145 		}
146 		if (imsg_add(wbuf, remotes[i].fetch_url, iremote.fetch_url_len) == -1) {
147 			err = got_error_from_errno(
148 			    "imsg_add GITCONFIG_REMOTE");
149 			ibuf_free(wbuf);
150 			return err;
151 		}
152 		if (imsg_add(wbuf, remotes[i].send_url, iremote.send_url_len) == -1) {
153 			err = got_error_from_errno(
154 			    "imsg_add GITCONFIG_REMOTE");
155 			ibuf_free(wbuf);
156 			return err;
157 		}
158 
159 		wbuf->fd = -1;
160 		imsg_close(ibuf, wbuf);
161 		err = got_privsep_flush_imsg(ibuf);
162 		if (err)
163 			return err;
164 	}
165 
166 	return NULL;
167 }
168 
169 static int
170 get_boolean_val(char *val)
171 {
172     return (strcasecmp(val, "true") == 0 ||
173 	strcasecmp(val, "on") == 0 ||
174 	strcasecmp(val, "yes") == 0 ||
175 	strcmp(val, "1") == 0);
176 }
177 
178 static const struct got_error *
179 gitconfig_remotes_request(struct imsgbuf *ibuf, struct got_gitconfig *gitconfig)
180 {
181 	const struct got_error *err = NULL;
182 	struct got_gitconfig_list *sections;
183 	struct got_gitconfig_list_node *node;
184 	struct got_remote_repo *remotes = NULL;
185 	int nremotes = 0, i;
186 
187 	if (gitconfig == NULL)
188 		return got_error(GOT_ERR_PRIVSEP_MSG);
189 
190 	err = got_gitconfig_get_section_list(&sections, gitconfig);
191 	if (err)
192 		return err;
193 
194 	TAILQ_FOREACH(node, &sections->fields, link) {
195 		if (strncasecmp("remote \"", node->field, 8) != 0)
196 			continue;
197 		nremotes++;
198 	}
199 
200 	if (nremotes == 0) {
201 		err = send_gitconfig_remotes(ibuf, NULL, 0);
202 		goto done;
203 	}
204 
205 	remotes = recallocarray(NULL, 0, nremotes, sizeof(*remotes));
206 	if (remotes == NULL) {
207 		err = got_error_from_errno("recallocarray");
208 		goto done;
209 	}
210 
211 	i = 0;
212 	TAILQ_FOREACH(node, &sections->fields, link) {
213 		char *name, *end, *mirror;
214 
215 		if (strncasecmp("remote \"", node->field, 8) != 0)
216 			continue;
217 
218 		name = strdup(node->field + 8);
219 		if (name == NULL) {
220 			err = got_error_from_errno("strdup");
221 			goto done;
222 		}
223 		end = strrchr(name, '"');
224 		if (end)
225 			*end = '\0';
226 		remotes[i].name = name;
227 
228 		remotes[i].fetch_url = got_gitconfig_get_str(gitconfig,
229 		    node->field, "url");
230 		if (remotes[i].fetch_url == NULL) {
231 			err = got_error(GOT_ERR_GITCONFIG_SYNTAX);
232 			goto done;
233 		}
234 
235 		remotes[i].send_url = got_gitconfig_get_str(gitconfig,
236 		    node->field, "pushurl");
237 		if (remotes[i].send_url == NULL)
238 			remotes[i].send_url = got_gitconfig_get_str(gitconfig,
239 			    node->field, "url");
240 		if (remotes[i].send_url == NULL) {
241 			err = got_error(GOT_ERR_GITCONFIG_SYNTAX);
242 			goto done;
243 		}
244 
245 		remotes[i].mirror_references = 0;
246 		mirror = got_gitconfig_get_str(gitconfig, node->field,
247 		    "mirror");
248 		if (mirror != NULL && get_boolean_val(mirror))
249 			remotes[i].mirror_references = 1;
250 
251 		i++;
252 	}
253 
254 	err = send_gitconfig_remotes(ibuf, remotes, nremotes);
255 done:
256 	for (i = 0; i < nremotes; i++)
257 		free(remotes[i].name);
258 	free(remotes);
259 	got_gitconfig_free_list(sections);
260 	return err;
261 }
262 
263 static const struct got_error *
264 gitconfig_owner_request(struct imsgbuf *ibuf, struct got_gitconfig *gitconfig)
265 {
266 	char *value;
267 
268 	if (gitconfig == NULL)
269 		return got_error(GOT_ERR_PRIVSEP_MSG);
270 
271 	value = got_gitconfig_get_str(gitconfig, "gotweb", "owner");
272 	if (value)
273 		return send_gitconfig_str(ibuf, value);
274 	value = got_gitconfig_get_str(gitconfig, "gitweb", "owner");
275 	return send_gitconfig_str(ibuf, value);
276 }
277 
278 static const struct got_error *
279 gitconfig_extensions_request(struct imsgbuf *ibuf,
280     struct got_gitconfig *gitconfig)
281 {
282 	const struct got_error *err = NULL;
283 	struct got_gitconfig_list *tags;
284 	struct got_gitconfig_list_node *node;
285 	int nextensions = 0;
286 	char *val;
287 
288 	if (gitconfig == NULL)
289 		return got_error(GOT_ERR_PRIVSEP_MSG);
290 
291 	tags = got_gitconfig_get_tag_list(gitconfig, "extensions");
292 	if (tags == NULL)
293 		return send_gitconfig_int(ibuf, 0);
294 
295 	TAILQ_FOREACH(node, &tags->fields, link) {
296 		val = got_gitconfig_get_str(gitconfig, "extensions",
297 		    node->field);
298 		if (get_boolean_val(val))
299 			nextensions++;
300 	}
301 
302 	err = send_gitconfig_int(ibuf, nextensions);
303 	if (err)
304 		goto done;
305 
306 	TAILQ_FOREACH(node, &tags->fields, link) {
307 		val = got_gitconfig_get_str(gitconfig, "extensions",
308 		    node->field);
309 		if (get_boolean_val(val)) {
310 			err = send_gitconfig_str(ibuf, node->field);
311 			if (err)
312 				goto done;
313 		}
314 	}
315 done:
316 	got_gitconfig_free_list(tags);
317 	return err;
318 }
319 
320 int
321 main(int argc, char *argv[])
322 {
323 	const struct got_error *err = NULL;
324 	struct imsgbuf ibuf;
325 	size_t datalen;
326 	struct got_gitconfig *gitconfig = NULL;
327 #if 0
328 	static int attached;
329 
330 	while (!attached)
331 		sleep(1);
332 #endif
333 	signal(SIGINT, catch_sigint);
334 
335 	imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
336 
337 #ifndef PROFILE
338 	/* revoke access to most system calls */
339 	if (pledge("stdio recvfd", NULL) == -1) {
340 		err = got_error_from_errno("pledge");
341 		got_privsep_send_error(&ibuf, err);
342 		return 1;
343 	}
344 #endif
345 
346 	for (;;) {
347 		struct imsg imsg;
348 
349 		memset(&imsg, 0, sizeof(imsg));
350 		imsg.fd = -1;
351 
352 		if (sigint_received) {
353 			err = got_error(GOT_ERR_CANCELLED);
354 			break;
355 		}
356 
357 		err = got_privsep_recv_imsg(&imsg, &ibuf, 0);
358 		if (err) {
359 			if (err->code == GOT_ERR_PRIVSEP_PIPE)
360 				err = NULL;
361 			break;
362 		}
363 
364 		if (imsg.hdr.type == GOT_IMSG_STOP)
365 			break;
366 
367 		switch (imsg.hdr.type) {
368 		case GOT_IMSG_GITCONFIG_PARSE_REQUEST:
369 			datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
370 			if (datalen != 0) {
371 				err = got_error(GOT_ERR_PRIVSEP_LEN);
372 				break;
373 			}
374 			if (imsg.fd == -1){
375 				err = got_error(GOT_ERR_PRIVSEP_NO_FD);
376 				break;
377 			}
378 
379 			if (gitconfig)
380 				got_gitconfig_close(gitconfig);
381 			err = got_gitconfig_open(&gitconfig, imsg.fd);
382 			break;
383 		case GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST:
384 			err = gitconfig_num_request(&ibuf, gitconfig, "core",
385 			    "repositoryformatversion", 0);
386 			break;
387 		case GOT_IMSG_GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST:
388 			err = gitconfig_extensions_request(&ibuf, gitconfig);
389 			break;
390 		case GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST:
391 			err = gitconfig_str_request(&ibuf, gitconfig, "user",
392 			    "name");
393 			break;
394 		case GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST:
395 			err = gitconfig_str_request(&ibuf, gitconfig, "user",
396 			    "email");
397 			break;
398 		case GOT_IMSG_GITCONFIG_REMOTES_REQUEST:
399 			err = gitconfig_remotes_request(&ibuf, gitconfig);
400 			break;
401 		case GOT_IMSG_GITCONFIG_OWNER_REQUEST:
402 			err = gitconfig_owner_request(&ibuf, gitconfig);
403 			break;
404 		default:
405 			err = got_error(GOT_ERR_PRIVSEP_MSG);
406 			break;
407 		}
408 
409 		if (imsg.fd != -1) {
410 			if (close(imsg.fd) == -1 && err == NULL)
411 				err = got_error_from_errno("close");
412 		}
413 
414 		imsg_free(&imsg);
415 		if (err)
416 			break;
417 	}
418 
419 	imsg_clear(&ibuf);
420 	if (err) {
421 		if (!sigint_received && err->code != GOT_ERR_PRIVSEP_PIPE) {
422 			fprintf(stderr, "%s: %s\n", getprogname(), err->msg);
423 			got_privsep_send_error(&ibuf, err);
424 		}
425 	}
426 	if (close(GOT_IMSG_FD_CHILD) == -1 && err == NULL)
427 		err = got_error_from_errno("close");
428 	return err ? 1 : 0;
429 }