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/queue.h>
19 #include <sys/uio.h>
20 #include <sys/time.h>
21 #include <sys/syslimits.h>
22 
23 #include <stdint.h>
24 #include <imsg.h>
25 #include <limits.h>
26 #include <signal.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <sha1.h>
31 #include <zlib.h>
32 
33 #include "got_error.h"
34 #include "got_object.h"
35 #include "got_repository.h"
36 
37 #include "got_lib_delta.h"
38 #include "got_lib_object.h"
39 #include "got_lib_privsep.h"
40 #include "got_lib_gitconfig.h"
41 
42 static volatile sig_atomic_t sigint_received;
43 
44 static void
45 catch_sigint(int signo)
46 {
47 	sigint_received = 1;
48 }
49 
50 static const struct got_error *
51 send_gitconfig_int(struct imsgbuf *ibuf, int value)
52 {
53 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_INT_VAL, 0, 0, -1,
54 	    &value, sizeof(value)) == -1)
55 		return got_error_from_errno("imsg_compose GITCONFIG_INT_VAL");
56 
57 	return got_privsep_flush_imsg(ibuf);
58 }
59 
60 static const struct got_error *
61 gitconfig_num_request(struct imsgbuf *ibuf, struct got_gitconfig *gitconfig,
62     char *section, char *tag, int def)
63 {
64 	int value;
65 
66 	if (gitconfig == NULL)
67 		return got_error(GOT_ERR_PRIVSEP_MSG);
68 
69 	value = got_gitconfig_get_num(gitconfig, section, tag, def);
70 	return send_gitconfig_int(ibuf, value);
71 }
72 
73 static const struct got_error *
74 send_gitconfig_str(struct imsgbuf *ibuf, const char *value)
75 {
76 	size_t len = value ? strlen(value) + 1 : 0;
77 
78 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_STR_VAL, 0, 0, -1,
79 	    value, len) == -1)
80 		return got_error_from_errno("imsg_compose GITCONFIG_STR_VAL");
81 
82 	return got_privsep_flush_imsg(ibuf);
83 }
84 
85 static const struct got_error *
86 gitconfig_str_request(struct imsgbuf *ibuf, struct got_gitconfig *gitconfig,
87     char *section, char *tag)
88 {
89 	char *value;
90 
91 	if (gitconfig == NULL)
92 		return got_error(GOT_ERR_PRIVSEP_MSG);
93 
94 	value = got_gitconfig_get_str(gitconfig, section, tag);
95 	return send_gitconfig_str(ibuf, value);
96 }
97 
98 static const struct got_error *
99 send_gitconfig_remotes(struct imsgbuf *ibuf, struct got_remote_repo *remotes,
100     int nremotes)
101 {
102 	const struct got_error *err = NULL;
103 	struct got_imsg_remotes iremotes;
104 	int i;
105 
106 	iremotes.nremotes = nremotes;
107 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_REMOTES, 0, 0, -1,
108 	    &iremotes, sizeof(iremotes)) == -1)
109 		return got_error_from_errno("imsg_compose GITCONFIG_REMOTES");
110 
111 	err = got_privsep_flush_imsg(ibuf);
112 	imsg_clear(ibuf);
113 	if (err)
114 		return err;
115 
116 	for (i = 0; i < nremotes; i++) {
117 		struct got_imsg_remote iremote;
118 		size_t len = sizeof(iremote);
119 		struct ibuf *wbuf;
120 
121 		iremote.mirror_references = remotes[i].mirror_references;
122 		iremote.name_len = strlen(remotes[i].name);
123 		len += iremote.name_len;
124 		iremote.url_len = strlen(remotes[i].url);
125 		len += iremote.url_len;
126 
127 		wbuf = imsg_create(ibuf, GOT_IMSG_GITCONFIG_REMOTE, 0, 0, len);
128 		if (wbuf == NULL)
129 			return got_error_from_errno(
130 			    "imsg_create GITCONFIG_REMOTE");
131 
132 		if (imsg_add(wbuf, &iremote, sizeof(iremote)) == -1) {
133 			err = got_error_from_errno(
134 			    "imsg_add GITCONFIG_REMOTE");
135 			ibuf_free(wbuf);
136 			return err;
137 		}
138 
139 		if (imsg_add(wbuf, remotes[i].name, iremote.name_len) == -1) {
140 			err = got_error_from_errno(
141 			    "imsg_add GITCONFIG_REMOTE");
142 			ibuf_free(wbuf);
143 			return err;
144 		}
145 		if (imsg_add(wbuf, remotes[i].url, iremote.url_len) == -1) {
146 			err = got_error_from_errno(
147 			    "imsg_add GITCONFIG_REMOTE");
148 			ibuf_free(wbuf);
149 			return err;
150 		}
151 
152 		wbuf->fd = -1;
153 		imsg_close(ibuf, wbuf);
154 		err = got_privsep_flush_imsg(ibuf);
155 		if (err)
156 			return err;
157 	}
158 
159 	return NULL;
160 }
161 
162 
163 static const struct got_error *
164 gitconfig_remotes_request(struct imsgbuf *ibuf, struct got_gitconfig *gitconfig)
165 {
166 	const struct got_error *err = NULL;
167 	struct got_gitconfig_list *sections;
168 	struct got_gitconfig_list_node *node;
169 	struct got_remote_repo *remotes = NULL;
170 	int nremotes = 0, i;
171 
172 	if (gitconfig == NULL)
173 		return got_error(GOT_ERR_PRIVSEP_MSG);
174 
175 	err = got_gitconfig_get_section_list(&sections, gitconfig);
176 	if (err)
177 		return err;
178 
179 	TAILQ_FOREACH(node, &sections->fields, link) {
180 		if (strncasecmp("remote \"", node->field, 8) != 0)
181 			continue;
182 		nremotes++;
183 	}
184 
185 	if (nremotes == 0) {
186 		err = send_gitconfig_remotes(ibuf, NULL, 0);
187 		goto done;
188 	}
189 
190 	remotes = recallocarray(NULL, 0, nremotes, sizeof(*remotes));
191 	if (remotes == NULL) {
192 		err = got_error_from_errno("recallocarray");
193 		goto done;
194 	}
195 
196 	i = 0;
197 	TAILQ_FOREACH(node, &sections->fields, link) {
198 		char *name, *end, *mirror;
199 
200 		if (strncasecmp("remote \"", node->field, 8) != 0)
201 			continue;
202 
203 		name = strdup(node->field + 8);
204 		if (name == NULL) {
205 			err = got_error_from_errno("strdup");
206 			goto done;
207 		}
208 		end = strrchr(name, '"');
209 		if (end)
210 			*end = '\0';
211 		remotes[i].name = name;
212 
213 		remotes[i].url = got_gitconfig_get_str(gitconfig,
214 		    node->field, "url");
215 		if (remotes[i].url == NULL) {
216 			err = got_error(GOT_ERR_GITCONFIG_SYNTAX);
217 			goto done;
218 		}
219 
220 		remotes[i].mirror_references = 0;
221 		mirror = got_gitconfig_get_str(gitconfig, node->field,
222 		    "mirror");
223 		if (mirror != NULL &&
224 		    (strcasecmp(mirror, "true") == 0 ||
225 		    strcasecmp(mirror, "on") == 0 ||
226 		    strcasecmp(mirror, "yes") == 0 ||
227 		    strcmp(mirror, "1") == 0))
228 			remotes[i].mirror_references = 1;
229 
230 		i++;
231 	}
232 
233 	err = send_gitconfig_remotes(ibuf, remotes, nremotes);
234 done:
235 	for (i = 0; i < nremotes; i++)
236 		free(remotes[i].name);
237 	free(remotes);
238 	got_gitconfig_free_list(sections);
239 	return err;
240 }
241 
242 static const struct got_error *
243 gitconfig_owner_request(struct imsgbuf *ibuf, struct got_gitconfig *gitconfig)
244 {
245 	char *value;
246 
247 	if (gitconfig == NULL)
248 		return got_error(GOT_ERR_PRIVSEP_MSG);
249 
250 	value = got_gitconfig_get_str(gitconfig, "gotweb", "owner");
251 	if (value)
252 		return send_gitconfig_str(ibuf, value);
253 	value = got_gitconfig_get_str(gitconfig, "gitweb", "owner");
254 	return send_gitconfig_str(ibuf, value);
255 }
256 
257 int
258 main(int argc, char *argv[])
259 {
260 	const struct got_error *err = NULL;
261 	struct imsgbuf ibuf;
262 	size_t datalen;
263 	struct got_gitconfig *gitconfig = NULL;
264 #if 0
265 	static int attached;
266 
267 	while (!attached)
268 		sleep(1);
269 #endif
270 	signal(SIGINT, catch_sigint);
271 
272 	imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
273 
274 #ifndef PROFILE
275 	/* revoke access to most system calls */
276 	if (pledge("stdio recvfd", NULL) == -1) {
277 		err = got_error_from_errno("pledge");
278 		got_privsep_send_error(&ibuf, err);
279 		return 1;
280 	}
281 #endif
282 
283 	for (;;) {
284 		struct imsg imsg;
285 
286 		memset(&imsg, 0, sizeof(imsg));
287 		imsg.fd = -1;
288 
289 		if (sigint_received) {
290 			err = got_error(GOT_ERR_CANCELLED);
291 			break;
292 		}
293 
294 		err = got_privsep_recv_imsg(&imsg, &ibuf, 0);
295 		if (err) {
296 			if (err->code == GOT_ERR_PRIVSEP_PIPE)
297 				err = NULL;
298 			break;
299 		}
300 
301 		if (imsg.hdr.type == GOT_IMSG_STOP)
302 			break;
303 
304 		switch (imsg.hdr.type) {
305 		case GOT_IMSG_GITCONFIG_PARSE_REQUEST:
306 			datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
307 			if (datalen != 0) {
308 				err = got_error(GOT_ERR_PRIVSEP_LEN);
309 				break;
310 			}
311 			if (imsg.fd == -1){
312 				err = got_error(GOT_ERR_PRIVSEP_NO_FD);
313 				break;
314 			}
315 
316 			if (gitconfig)
317 				got_gitconfig_close(gitconfig);
318 			err = got_gitconfig_open(&gitconfig, imsg.fd);
319 			break;
320 		case GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST:
321 			err = gitconfig_num_request(&ibuf, gitconfig, "core",
322 			    "repositoryformatversion", 0);
323 			break;
324 		case GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST:
325 			err = gitconfig_str_request(&ibuf, gitconfig, "user",
326 			    "name");
327 			break;
328 		case GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST:
329 			err = gitconfig_str_request(&ibuf, gitconfig, "user",
330 			    "email");
331 			break;
332 		case GOT_IMSG_GITCONFIG_REMOTES_REQUEST:
333 			err = gitconfig_remotes_request(&ibuf, gitconfig);
334 			break;
335 		case GOT_IMSG_GITCONFIG_OWNER_REQUEST:
336 			err = gitconfig_owner_request(&ibuf, gitconfig);
337 			break;
338 		default:
339 			err = got_error(GOT_ERR_PRIVSEP_MSG);
340 			break;
341 		}
342 
343 		if (imsg.fd != -1) {
344 			if (close(imsg.fd) == -1 && err == NULL)
345 				err = got_error_from_errno("close");
346 		}
347 
348 		imsg_free(&imsg);
349 		if (err)
350 			break;
351 	}
352 
353 	imsg_clear(&ibuf);
354 	if (err) {
355 		if (!sigint_received && err->code != GOT_ERR_PRIVSEP_PIPE) {
356 			fprintf(stderr, "%s: %s\n", getprogname(), err->msg);
357 			got_privsep_send_error(&ibuf, err);
358 		}
359 	}
360 	if (close(GOT_IMSG_FD_CHILD) != 0 && err == NULL)
361 		err = got_error_from_errno("close");
362 	return err ? 1 : 0;
363 }