1 069bbb86 2022-03-07 thomas /*
  2 069bbb86 2022-03-07 thomas  * Copyright 1986, Larry Wall
  3 069bbb86 2022-03-07 thomas  * 
  4 069bbb86 2022-03-07 thomas  * Redistribution and use in source and binary forms, with or without
  5 069bbb86 2022-03-07 thomas  * modification, are permitted provided that the following condition is met:
  6 069bbb86 2022-03-07 thomas  * 1. Redistributions of source code must retain the above copyright notice,
  7 069bbb86 2022-03-07 thomas  * this condition and the following disclaimer.
  8 069bbb86 2022-03-07 thomas  * 
  9 069bbb86 2022-03-07 thomas  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
 10 069bbb86 2022-03-07 thomas  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 11 069bbb86 2022-03-07 thomas  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 12 069bbb86 2022-03-07 thomas  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
 13 069bbb86 2022-03-07 thomas  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 14 069bbb86 2022-03-07 thomas  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 15 069bbb86 2022-03-07 thomas  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 16 069bbb86 2022-03-07 thomas  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 17 069bbb86 2022-03-07 thomas  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 18 069bbb86 2022-03-07 thomas  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 19 069bbb86 2022-03-07 thomas  * SUCH DAMAGE.
 20 069bbb86 2022-03-07 thomas  */
 21 069bbb86 2022-03-07 thomas 
 22 069bbb86 2022-03-07 thomas /*
 23 069bbb86 2022-03-07 thomas  * Copyright (c) 2022 Omar Polo <op@openbsd.org>
 24 069bbb86 2022-03-07 thomas  *
 25 069bbb86 2022-03-07 thomas  * Permission to use, copy, modify, and distribute this software for any
 26 069bbb86 2022-03-07 thomas  * purpose with or without fee is hereby granted, provided that the above
 27 069bbb86 2022-03-07 thomas  * copyright notice and this permission notice appear in all copies.
 28 069bbb86 2022-03-07 thomas  *
 29 069bbb86 2022-03-07 thomas  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 30 069bbb86 2022-03-07 thomas  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 31 069bbb86 2022-03-07 thomas  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 32 069bbb86 2022-03-07 thomas  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 33 069bbb86 2022-03-07 thomas  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 34 069bbb86 2022-03-07 thomas  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 35 069bbb86 2022-03-07 thomas  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 36 069bbb86 2022-03-07 thomas  */
 37 069bbb86 2022-03-07 thomas 
 38 069bbb86 2022-03-07 thomas #include <sys/types.h>
 39 069bbb86 2022-03-07 thomas #include <sys/uio.h>
 40 069bbb86 2022-03-07 thomas 
 41 069bbb86 2022-03-07 thomas #include <ctype.h>
 42 069bbb86 2022-03-07 thomas #include <limits.h>
 43 069bbb86 2022-03-07 thomas #include <paths.h>
 44 069bbb86 2022-03-07 thomas #include <stdint.h>
 45 069bbb86 2022-03-07 thomas #include <stdio.h>
 46 069bbb86 2022-03-07 thomas #include <stdlib.h>
 47 069bbb86 2022-03-07 thomas #include <string.h>
 48 069bbb86 2022-03-07 thomas #include <unistd.h>
 49 069bbb86 2022-03-07 thomas 
 50 069bbb86 2022-03-07 thomas #include "got_error.h"
 51 069bbb86 2022-03-07 thomas #include "got_object.h"
 52 069bbb86 2022-03-07 thomas 
 53 973f3f6e 2022-03-07 thomas #include "got_compat.h"
 54 973f3f6e 2022-03-07 thomas 
 55 069bbb86 2022-03-07 thomas #include "got_lib_delta.h"
 56 069bbb86 2022-03-07 thomas #include "got_lib_object.h"
 57 069bbb86 2022-03-07 thomas #include "got_lib_privsep.h"
 58 069bbb86 2022-03-07 thomas 
 59 069bbb86 2022-03-07 thomas struct imsgbuf ibuf;
 60 069bbb86 2022-03-07 thomas 
 61 069bbb86 2022-03-07 thomas static const struct got_error *
 62 be53ddb1 2022-03-22 thomas send_patch(const char *oldname, const char *newname, int git)
 63 069bbb86 2022-03-07 thomas {
 64 069bbb86 2022-03-07 thomas 	struct got_imsg_patch p;
 65 069bbb86 2022-03-07 thomas 
 66 069bbb86 2022-03-07 thomas 	memset(&p, 0, sizeof(p));
 67 069bbb86 2022-03-07 thomas 
 68 d9db2ff9 2022-04-16 thomas 	if (oldname != NULL)
 69 069bbb86 2022-03-07 thomas 		strlcpy(p.old, oldname, sizeof(p.old));
 70 be53ddb1 2022-03-22 thomas 
 71 069bbb86 2022-03-07 thomas 	if (newname != NULL)
 72 069bbb86 2022-03-07 thomas 		strlcpy(p.new, newname, sizeof(p.new));
 73 069bbb86 2022-03-07 thomas 
 74 d9db2ff9 2022-04-16 thomas 	p.git = git;
 75 069bbb86 2022-03-07 thomas 	if (imsg_compose(&ibuf, GOT_IMSG_PATCH, 0, 0, -1,
 76 069bbb86 2022-03-07 thomas 	    &p, sizeof(p)) == -1)
 77 069bbb86 2022-03-07 thomas 		return got_error_from_errno("imsg_compose GOT_IMSG_PATCH");
 78 069bbb86 2022-03-07 thomas 	return NULL;
 79 069bbb86 2022-03-07 thomas }
 80 069bbb86 2022-03-07 thomas 
 81 069bbb86 2022-03-07 thomas static const struct got_error *
 82 069bbb86 2022-03-07 thomas send_patch_done(void)
 83 069bbb86 2022-03-07 thomas {
 84 069bbb86 2022-03-07 thomas 	if (imsg_compose(&ibuf, GOT_IMSG_PATCH_DONE, 0, 0, -1,
 85 069bbb86 2022-03-07 thomas 	    NULL, 0) == -1)
 86 069bbb86 2022-03-07 thomas 		return got_error_from_errno("imsg_compose GOT_IMSG_PATCH_EOF");
 87 069bbb86 2022-03-07 thomas 	if (imsg_flush(&ibuf) == -1)
 88 069bbb86 2022-03-07 thomas 		return got_error_from_errno("imsg_flush");
 89 069bbb86 2022-03-07 thomas 	return NULL;
 90 069bbb86 2022-03-07 thomas }
 91 069bbb86 2022-03-07 thomas 
 92 069bbb86 2022-03-07 thomas /* based on fetchname from usr.bin/patch/util.c */
 93 069bbb86 2022-03-07 thomas static const struct got_error *
 94 d9db2ff9 2022-04-16 thomas filename(const char *at, char **name)
 95 069bbb86 2022-03-07 thomas {
 96 d9db2ff9 2022-04-16 thomas 	char	*tmp, *t;
 97 069bbb86 2022-03-07 thomas 
 98 069bbb86 2022-03-07 thomas 	*name = NULL;
 99 069bbb86 2022-03-07 thomas 	if (*at == '\0')
100 069bbb86 2022-03-07 thomas 		return NULL;
101 069bbb86 2022-03-07 thomas 
102 069bbb86 2022-03-07 thomas 	while (isspace((unsigned char)*at))
103 069bbb86 2022-03-07 thomas 		at++;
104 069bbb86 2022-03-07 thomas 
105 069bbb86 2022-03-07 thomas 	/* files can be created or removed by diffing against /dev/null */
106 17d6446a 2022-03-22 thomas 	if (!strncmp(at, _PATH_DEVNULL, sizeof(_PATH_DEVNULL) - 1))
107 069bbb86 2022-03-07 thomas 		return NULL;
108 069bbb86 2022-03-07 thomas 
109 d9db2ff9 2022-04-16 thomas 	tmp = strdup(at);
110 d9db2ff9 2022-04-16 thomas 	if (tmp == NULL)
111 069bbb86 2022-03-07 thomas 		return got_error_from_errno("strdup");
112 d9db2ff9 2022-04-16 thomas 	if ((t = strchr(tmp, '\t')) != NULL)
113 d9db2ff9 2022-04-16 thomas 		*t = '\0';
114 d9db2ff9 2022-04-16 thomas 	if ((t = strchr(tmp, '\n')) != NULL)
115 d9db2ff9 2022-04-16 thomas 		*t = '\0';
116 069bbb86 2022-03-07 thomas 
117 d9db2ff9 2022-04-16 thomas 	*name = strdup(tmp);
118 d9db2ff9 2022-04-16 thomas 	free(tmp);
119 069bbb86 2022-03-07 thomas 	if (*name == NULL)
120 069bbb86 2022-03-07 thomas 		return got_error_from_errno("strdup");
121 069bbb86 2022-03-07 thomas 	return NULL;
122 069bbb86 2022-03-07 thomas }
123 069bbb86 2022-03-07 thomas 
124 069bbb86 2022-03-07 thomas static const struct got_error *
125 069bbb86 2022-03-07 thomas find_patch(FILE *fp)
126 069bbb86 2022-03-07 thomas {
127 069bbb86 2022-03-07 thomas 	const struct got_error *err = NULL;
128 069bbb86 2022-03-07 thomas 	char	*old = NULL, *new = NULL;
129 069bbb86 2022-03-07 thomas 	char	*line = NULL;
130 069bbb86 2022-03-07 thomas 	size_t	 linesize = 0;
131 069bbb86 2022-03-07 thomas 	ssize_t	 linelen;
132 069bbb86 2022-03-07 thomas 	int	 create, git = 0;
133 069bbb86 2022-03-07 thomas 
134 069bbb86 2022-03-07 thomas 	while ((linelen = getline(&line, &linesize, fp)) != -1) {
135 069bbb86 2022-03-07 thomas 		/*
136 069bbb86 2022-03-07 thomas 		 * Ignore the Index name like GNU and larry' patch,
137 069bbb86 2022-03-07 thomas 		 * we don't have to follow POSIX.
138 069bbb86 2022-03-07 thomas 		 */
139 069bbb86 2022-03-07 thomas 
140 d9db2ff9 2022-04-16 thomas 		if (!strncmp(line, "--- ", 4)) {
141 069bbb86 2022-03-07 thomas 			free(old);
142 d9db2ff9 2022-04-16 thomas 			err = filename(line+4, &old);
143 069bbb86 2022-03-07 thomas 		} else if (!strncmp(line, "+++ ", 4)) {
144 069bbb86 2022-03-07 thomas 			free(new);
145 d9db2ff9 2022-04-16 thomas 			err = filename(line+4, &new);
146 069bbb86 2022-03-07 thomas 		} else if (!strncmp(line, "diff --git a/", 13))
147 069bbb86 2022-03-07 thomas 			git = 1;
148 069bbb86 2022-03-07 thomas 
149 069bbb86 2022-03-07 thomas 		if (err)
150 069bbb86 2022-03-07 thomas 			break;
151 069bbb86 2022-03-07 thomas 
152 069bbb86 2022-03-07 thomas 		if (!strncmp(line, "@@ -", 4)) {
153 069bbb86 2022-03-07 thomas 			create = !strncmp(line+4, "0,0", 3);
154 069bbb86 2022-03-07 thomas 			if ((old == NULL && new == NULL) ||
155 069bbb86 2022-03-07 thomas 			    (!create && old == NULL))
156 069bbb86 2022-03-07 thomas 				err = got_error(GOT_ERR_PATCH_MALFORMED);
157 069bbb86 2022-03-07 thomas 			else
158 be53ddb1 2022-03-22 thomas 				err = send_patch(old, new, git);
159 069bbb86 2022-03-07 thomas 
160 069bbb86 2022-03-07 thomas 			if (err)
161 069bbb86 2022-03-07 thomas 				break;
162 069bbb86 2022-03-07 thomas 
163 069bbb86 2022-03-07 thomas 			/* rewind to previous line */
164 069bbb86 2022-03-07 thomas 			if (fseek(fp, linelen * -1, SEEK_CUR) == -1)
165 069bbb86 2022-03-07 thomas 				err = got_error_from_errno("fseek");
166 069bbb86 2022-03-07 thomas 			break;
167 069bbb86 2022-03-07 thomas 		}
168 069bbb86 2022-03-07 thomas 	}
169 069bbb86 2022-03-07 thomas 
170 19f1a2ac 2022-03-13 thomas 	free(old);
171 19f1a2ac 2022-03-13 thomas 	free(new);
172 069bbb86 2022-03-07 thomas 	free(line);
173 069bbb86 2022-03-07 thomas 	if (ferror(fp) && err == NULL)
174 069bbb86 2022-03-07 thomas 		err = got_error_from_errno("getline");
175 069bbb86 2022-03-07 thomas 	if (feof(fp) && err == NULL)
176 069bbb86 2022-03-07 thomas 		err = got_error(GOT_ERR_NO_PATCH);
177 069bbb86 2022-03-07 thomas 	return err;
178 069bbb86 2022-03-07 thomas }
179 069bbb86 2022-03-07 thomas 
180 069bbb86 2022-03-07 thomas static const struct got_error *
181 069bbb86 2022-03-07 thomas strtolnum(char **str, long *n)
182 069bbb86 2022-03-07 thomas {
183 069bbb86 2022-03-07 thomas 	char		*p, c;
184 069bbb86 2022-03-07 thomas 	const char	*errstr;
185 069bbb86 2022-03-07 thomas 
186 069bbb86 2022-03-07 thomas 	for (p = *str; isdigit((unsigned char)*p); ++p)
187 069bbb86 2022-03-07 thomas 		/* nop */;
188 069bbb86 2022-03-07 thomas 
189 069bbb86 2022-03-07 thomas 	c = *p;
190 069bbb86 2022-03-07 thomas 	*p = '\0';
191 069bbb86 2022-03-07 thomas 
192 069bbb86 2022-03-07 thomas 	*n = strtonum(*str, 0, LONG_MAX, &errstr);
193 069bbb86 2022-03-07 thomas 	if (errstr != NULL)
194 069bbb86 2022-03-07 thomas 		return got_error(GOT_ERR_PATCH_MALFORMED);
195 069bbb86 2022-03-07 thomas 
196 069bbb86 2022-03-07 thomas 	*p = c;
197 069bbb86 2022-03-07 thomas 	*str = p;
198 069bbb86 2022-03-07 thomas 	return NULL;
199 069bbb86 2022-03-07 thomas }
200 069bbb86 2022-03-07 thomas 
201 069bbb86 2022-03-07 thomas static const struct got_error *
202 069bbb86 2022-03-07 thomas parse_hdr(char *s, int *ok, struct got_imsg_patch_hunk *hdr)
203 069bbb86 2022-03-07 thomas {
204 069bbb86 2022-03-07 thomas 	static const struct got_error *err = NULL;
205 069bbb86 2022-03-07 thomas 
206 069bbb86 2022-03-07 thomas 	*ok = 1;
207 069bbb86 2022-03-07 thomas 	if (strncmp(s, "@@ -", 4)) {
208 069bbb86 2022-03-07 thomas 		*ok = 0;
209 069bbb86 2022-03-07 thomas 		return NULL;
210 069bbb86 2022-03-07 thomas 	}
211 069bbb86 2022-03-07 thomas 
212 069bbb86 2022-03-07 thomas 	s += 4;
213 069bbb86 2022-03-07 thomas 	if (!*s)
214 069bbb86 2022-03-07 thomas 		return NULL;
215 069bbb86 2022-03-07 thomas 	err = strtolnum(&s, &hdr->oldfrom);
216 069bbb86 2022-03-07 thomas 	if (err)
217 069bbb86 2022-03-07 thomas 		return err;
218 069bbb86 2022-03-07 thomas 	if (*s == ',') {
219 069bbb86 2022-03-07 thomas 		s++;
220 069bbb86 2022-03-07 thomas 		err = strtolnum(&s, &hdr->oldlines);
221 069bbb86 2022-03-07 thomas 		if (err)
222 069bbb86 2022-03-07 thomas 			return err;
223 069bbb86 2022-03-07 thomas 	} else
224 069bbb86 2022-03-07 thomas 		hdr->oldlines = 1;
225 069bbb86 2022-03-07 thomas 
226 069bbb86 2022-03-07 thomas 	if (*s == ' ')
227 069bbb86 2022-03-07 thomas 		s++;
228 069bbb86 2022-03-07 thomas 
229 069bbb86 2022-03-07 thomas 	if (*s != '+' || !*++s)
230 069bbb86 2022-03-07 thomas 		return got_error(GOT_ERR_PATCH_MALFORMED);
231 069bbb86 2022-03-07 thomas 	err = strtolnum(&s, &hdr->newfrom);
232 069bbb86 2022-03-07 thomas 	if (err)
233 069bbb86 2022-03-07 thomas 		return err;
234 069bbb86 2022-03-07 thomas 	if (*s == ',') {
235 069bbb86 2022-03-07 thomas 		s++;
236 069bbb86 2022-03-07 thomas 		err = strtolnum(&s, &hdr->newlines);
237 069bbb86 2022-03-07 thomas 		if (err)
238 069bbb86 2022-03-07 thomas 			return err;
239 069bbb86 2022-03-07 thomas 	} else
240 069bbb86 2022-03-07 thomas 		hdr->newlines = 1;
241 069bbb86 2022-03-07 thomas 
242 069bbb86 2022-03-07 thomas 	if (*s == ' ')
243 069bbb86 2022-03-07 thomas 		s++;
244 069bbb86 2022-03-07 thomas 
245 069bbb86 2022-03-07 thomas 	if (*s != '@')
246 069bbb86 2022-03-07 thomas 		return got_error(GOT_ERR_PATCH_MALFORMED);
247 069bbb86 2022-03-07 thomas 
248 069bbb86 2022-03-07 thomas 	if (hdr->oldfrom >= LONG_MAX - hdr->oldlines ||
249 069bbb86 2022-03-07 thomas 	    hdr->newfrom >= LONG_MAX - hdr->newlines ||
250 069bbb86 2022-03-07 thomas 	    /* not so sure about this one */
251 069bbb86 2022-03-07 thomas 	    hdr->oldlines >= LONG_MAX - hdr->newlines - 1)
252 069bbb86 2022-03-07 thomas 		return got_error(GOT_ERR_PATCH_MALFORMED);
253 069bbb86 2022-03-07 thomas 
254 069bbb86 2022-03-07 thomas 	if (hdr->oldlines == 0) {
255 069bbb86 2022-03-07 thomas 		/* larry says to "do append rather than insert"; I don't
256 069bbb86 2022-03-07 thomas 		 * quite get it, but i trust him.
257 069bbb86 2022-03-07 thomas 		 */
258 069bbb86 2022-03-07 thomas 		hdr->oldfrom++;
259 069bbb86 2022-03-07 thomas 	}
260 069bbb86 2022-03-07 thomas 
261 069bbb86 2022-03-07 thomas 	if (imsg_compose(&ibuf, GOT_IMSG_PATCH_HUNK, 0, 0, -1,
262 069bbb86 2022-03-07 thomas 	    hdr, sizeof(*hdr)) == -1)
263 069bbb86 2022-03-07 thomas 		return got_error_from_errno(
264 069bbb86 2022-03-07 thomas 		    "imsg_compose GOT_IMSG_PATCH_HUNK");
265 069bbb86 2022-03-07 thomas 	return NULL;
266 069bbb86 2022-03-07 thomas }
267 069bbb86 2022-03-07 thomas 
268 069bbb86 2022-03-07 thomas static const struct got_error *
269 069bbb86 2022-03-07 thomas send_line(const char *line)
270 069bbb86 2022-03-07 thomas {
271 069bbb86 2022-03-07 thomas 	static const struct got_error *err = NULL;
272 069bbb86 2022-03-07 thomas 	char *p = NULL;
273 069bbb86 2022-03-07 thomas 
274 ff7f34d3 2022-03-22 thomas 	if (*line != '+' && *line != '-' && *line != ' ' && *line != '\\') {
275 069bbb86 2022-03-07 thomas 		if (asprintf(&p, " %s", line) == -1)
276 069bbb86 2022-03-07 thomas 			return got_error_from_errno("asprintf");
277 069bbb86 2022-03-07 thomas 		line = p;
278 069bbb86 2022-03-07 thomas 	}
279 069bbb86 2022-03-07 thomas 
280 069bbb86 2022-03-07 thomas 	if (imsg_compose(&ibuf, GOT_IMSG_PATCH_LINE, 0, 0, -1,
281 17d6446a 2022-03-22 thomas 	    line, strlen(line) + 1) == -1)
282 069bbb86 2022-03-07 thomas 		err = got_error_from_errno(
283 069bbb86 2022-03-07 thomas 		    "imsg_compose GOT_IMSG_PATCH_LINE");
284 069bbb86 2022-03-07 thomas 
285 069bbb86 2022-03-07 thomas 	free(p);
286 069bbb86 2022-03-07 thomas 	return err;
287 069bbb86 2022-03-07 thomas }
288 069bbb86 2022-03-07 thomas 
289 069bbb86 2022-03-07 thomas static const struct got_error *
290 656c2baa 2022-04-23 thomas peek_special_line(FILE *fp)
291 ff7f34d3 2022-03-22 thomas {
292 ff7f34d3 2022-03-22 thomas 	const struct got_error *err;
293 1f954382 2022-03-22 thomas 	int ch;
294 ff7f34d3 2022-03-22 thomas 
295 ff7f34d3 2022-03-22 thomas 	ch = fgetc(fp);
296 ff7f34d3 2022-03-22 thomas 	if (ch != EOF && ch != '\\') {
297 ff7f34d3 2022-03-22 thomas 		ungetc(ch, fp);
298 ff7f34d3 2022-03-22 thomas 		return NULL;
299 ff7f34d3 2022-03-22 thomas 	}
300 ff7f34d3 2022-03-22 thomas 
301 656c2baa 2022-04-23 thomas 	if (ch == '\\') {
302 ff7f34d3 2022-03-22 thomas 		err = send_line("\\");
303 ff7f34d3 2022-03-22 thomas 		if (err)
304 ff7f34d3 2022-03-22 thomas 			return err;
305 ff7f34d3 2022-03-22 thomas 	}
306 ff7f34d3 2022-03-22 thomas 
307 ff7f34d3 2022-03-22 thomas 	while (ch != EOF && ch != '\n')
308 ff7f34d3 2022-03-22 thomas 		ch = fgetc(fp);
309 ff7f34d3 2022-03-22 thomas 
310 ff7f34d3 2022-03-22 thomas 	if (ch != EOF || feof(fp))
311 ff7f34d3 2022-03-22 thomas 		return NULL;
312 ff7f34d3 2022-03-22 thomas 	return got_error(GOT_ERR_IO);
313 ff7f34d3 2022-03-22 thomas }
314 ff7f34d3 2022-03-22 thomas 
315 ff7f34d3 2022-03-22 thomas static const struct got_error *
316 069bbb86 2022-03-07 thomas parse_hunk(FILE *fp, int *ok)
317 069bbb86 2022-03-07 thomas {
318 069bbb86 2022-03-07 thomas 	static const struct got_error *err = NULL;
319 069bbb86 2022-03-07 thomas 	struct got_imsg_patch_hunk hdr;
320 069bbb86 2022-03-07 thomas 	char	*line = NULL, ch;
321 069bbb86 2022-03-07 thomas 	size_t	 linesize = 0;
322 069bbb86 2022-03-07 thomas 	ssize_t	 linelen;
323 069bbb86 2022-03-07 thomas 	long	 leftold, leftnew;
324 069bbb86 2022-03-07 thomas 
325 069bbb86 2022-03-07 thomas 	linelen = getline(&line, &linesize, fp);
326 069bbb86 2022-03-07 thomas 	if (linelen == -1) {
327 069bbb86 2022-03-07 thomas 		*ok = 0;
328 069bbb86 2022-03-07 thomas 		goto done;
329 069bbb86 2022-03-07 thomas 	}
330 069bbb86 2022-03-07 thomas 
331 069bbb86 2022-03-07 thomas 	err = parse_hdr(line, ok, &hdr);
332 069bbb86 2022-03-07 thomas 	if (err)
333 069bbb86 2022-03-07 thomas 		goto done;
334 069bbb86 2022-03-07 thomas 	if (!*ok) {
335 069bbb86 2022-03-07 thomas 		if (fseek(fp, linelen * -1, SEEK_CUR) == -1)
336 069bbb86 2022-03-07 thomas 			err = got_error_from_errno("fseek");
337 069bbb86 2022-03-07 thomas 		goto done;
338 069bbb86 2022-03-07 thomas 	}
339 069bbb86 2022-03-07 thomas 
340 069bbb86 2022-03-07 thomas 	leftold = hdr.oldlines;
341 069bbb86 2022-03-07 thomas 	leftnew = hdr.newlines;
342 069bbb86 2022-03-07 thomas 
343 069bbb86 2022-03-07 thomas 	while (leftold > 0 || leftnew > 0) {
344 069bbb86 2022-03-07 thomas 		linelen = getline(&line, &linesize, fp);
345 069bbb86 2022-03-07 thomas 		if (linelen == -1) {
346 069bbb86 2022-03-07 thomas 			if (ferror(fp)) {
347 069bbb86 2022-03-07 thomas 				err = got_error_from_errno("getline");
348 069bbb86 2022-03-07 thomas 				goto done;
349 069bbb86 2022-03-07 thomas 			}
350 069bbb86 2022-03-07 thomas 
351 069bbb86 2022-03-07 thomas 			/* trailing newlines may be chopped */
352 069bbb86 2022-03-07 thomas 			if (leftold < 3 && leftnew < 3) {
353 069bbb86 2022-03-07 thomas 				*ok = 0;
354 069bbb86 2022-03-07 thomas 				break;
355 069bbb86 2022-03-07 thomas 			}
356 069bbb86 2022-03-07 thomas 
357 069bbb86 2022-03-07 thomas 			err = got_error(GOT_ERR_PATCH_TRUNCATED);
358 069bbb86 2022-03-07 thomas 			goto done;
359 069bbb86 2022-03-07 thomas 		}
360 ff7f34d3 2022-03-22 thomas 		if (line[linelen - 1] == '\n')
361 ff7f34d3 2022-03-22 thomas 			line[linelen - 1] = '\0';
362 069bbb86 2022-03-07 thomas 
363 069bbb86 2022-03-07 thomas 		/* usr.bin/patch allows '=' as context char */
364 069bbb86 2022-03-07 thomas 		if (*line == '=')
365 069bbb86 2022-03-07 thomas 			*line = ' ';
366 069bbb86 2022-03-07 thomas 
367 069bbb86 2022-03-07 thomas 		ch = *line;
368 ff7f34d3 2022-03-22 thomas 		if (ch == '\t' || ch == '\0')
369 069bbb86 2022-03-07 thomas 			ch = ' ';	/* the space got eaten */
370 069bbb86 2022-03-07 thomas 
371 069bbb86 2022-03-07 thomas 		switch (ch) {
372 069bbb86 2022-03-07 thomas 		case '-':
373 069bbb86 2022-03-07 thomas 			leftold--;
374 069bbb86 2022-03-07 thomas 			break;
375 069bbb86 2022-03-07 thomas 		case ' ':
376 069bbb86 2022-03-07 thomas 			leftold--;
377 069bbb86 2022-03-07 thomas 			leftnew--;
378 069bbb86 2022-03-07 thomas 			break;
379 069bbb86 2022-03-07 thomas 		case '+':
380 069bbb86 2022-03-07 thomas 			leftnew--;
381 069bbb86 2022-03-07 thomas 			break;
382 069bbb86 2022-03-07 thomas 		default:
383 069bbb86 2022-03-07 thomas 			err = got_error(GOT_ERR_PATCH_MALFORMED);
384 069bbb86 2022-03-07 thomas 			goto done;
385 069bbb86 2022-03-07 thomas 		}
386 069bbb86 2022-03-07 thomas 
387 069bbb86 2022-03-07 thomas 		if (leftold < 0 || leftnew < 0) {
388 069bbb86 2022-03-07 thomas 			err = got_error(GOT_ERR_PATCH_MALFORMED);
389 069bbb86 2022-03-07 thomas 			goto done;
390 069bbb86 2022-03-07 thomas 		}
391 069bbb86 2022-03-07 thomas 
392 069bbb86 2022-03-07 thomas 		err = send_line(line);
393 069bbb86 2022-03-07 thomas 		if (err)
394 069bbb86 2022-03-07 thomas 			goto done;
395 ff7f34d3 2022-03-22 thomas 
396 ff7f34d3 2022-03-22 thomas 		if ((ch == '-' && leftold == 0) ||
397 ff7f34d3 2022-03-22 thomas 		    (ch == '+' && leftnew == 0)) {
398 656c2baa 2022-04-23 thomas 			err = peek_special_line(fp);
399 ff7f34d3 2022-03-22 thomas 			if (err)
400 ff7f34d3 2022-03-22 thomas 				goto done;
401 ff7f34d3 2022-03-22 thomas 		}
402 069bbb86 2022-03-07 thomas 	}
403 069bbb86 2022-03-07 thomas 
404 069bbb86 2022-03-07 thomas done:
405 069bbb86 2022-03-07 thomas 	free(line);
406 069bbb86 2022-03-07 thomas 	return err;
407 069bbb86 2022-03-07 thomas }
408 069bbb86 2022-03-07 thomas 
409 069bbb86 2022-03-07 thomas static const struct got_error *
410 069bbb86 2022-03-07 thomas read_patch(struct imsgbuf *ibuf, int fd)
411 069bbb86 2022-03-07 thomas {
412 069bbb86 2022-03-07 thomas 	const struct got_error *err = NULL;
413 069bbb86 2022-03-07 thomas 	FILE *fp;
414 069bbb86 2022-03-07 thomas 	int ok, patch_found = 0;
415 069bbb86 2022-03-07 thomas 
416 069bbb86 2022-03-07 thomas 	if ((fp = fdopen(fd, "r")) == NULL) {
417 069bbb86 2022-03-07 thomas 		err = got_error_from_errno("fdopen");
418 069bbb86 2022-03-07 thomas 		close(fd);
419 069bbb86 2022-03-07 thomas 		return err;
420 069bbb86 2022-03-07 thomas 	}
421 069bbb86 2022-03-07 thomas 
422 069bbb86 2022-03-07 thomas 	while (!feof(fp)) {
423 069bbb86 2022-03-07 thomas 		err = find_patch(fp);
424 069bbb86 2022-03-07 thomas 		if (err)
425 069bbb86 2022-03-07 thomas 			goto done;
426 069bbb86 2022-03-07 thomas 
427 069bbb86 2022-03-07 thomas 		patch_found = 1;
428 069bbb86 2022-03-07 thomas 		for (;;) {
429 069bbb86 2022-03-07 thomas 			err = parse_hunk(fp, &ok);
430 069bbb86 2022-03-07 thomas 			if (err)
431 069bbb86 2022-03-07 thomas 				goto done;
432 069bbb86 2022-03-07 thomas 			if (!ok) {
433 069bbb86 2022-03-07 thomas 				err = send_patch_done();
434 069bbb86 2022-03-07 thomas 				if (err)
435 069bbb86 2022-03-07 thomas 					goto done;
436 069bbb86 2022-03-07 thomas 				break;
437 069bbb86 2022-03-07 thomas 			}
438 069bbb86 2022-03-07 thomas 		}
439 069bbb86 2022-03-07 thomas 	}
440 069bbb86 2022-03-07 thomas 
441 069bbb86 2022-03-07 thomas done:
442 069bbb86 2022-03-07 thomas 	fclose(fp);
443 069bbb86 2022-03-07 thomas 
444 069bbb86 2022-03-07 thomas 	/* ignore trailing gibberish */
445 069bbb86 2022-03-07 thomas 	if (err != NULL && err->code == GOT_ERR_NO_PATCH && patch_found)
446 069bbb86 2022-03-07 thomas 		err = NULL;
447 069bbb86 2022-03-07 thomas 
448 069bbb86 2022-03-07 thomas 	return err;
449 069bbb86 2022-03-07 thomas }
450 069bbb86 2022-03-07 thomas 
451 069bbb86 2022-03-07 thomas int
452 069bbb86 2022-03-07 thomas main(int argc, char **argv)
453 069bbb86 2022-03-07 thomas {
454 069bbb86 2022-03-07 thomas 	const struct got_error *err = NULL;
455 069bbb86 2022-03-07 thomas 	struct imsg imsg;
456 069bbb86 2022-03-07 thomas #if 0
457 069bbb86 2022-03-07 thomas 	static int attached;
458 069bbb86 2022-03-07 thomas 	while (!attached)
459 069bbb86 2022-03-07 thomas 		sleep(1);
460 069bbb86 2022-03-07 thomas #endif
461 069bbb86 2022-03-07 thomas 
462 069bbb86 2022-03-07 thomas 	imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
463 069bbb86 2022-03-07 thomas #ifndef PROFILE
464 069bbb86 2022-03-07 thomas 	/* revoke access to most system calls */
465 069bbb86 2022-03-07 thomas 	if (pledge("stdio recvfd", NULL) == -1) {
466 069bbb86 2022-03-07 thomas 		err = got_error_from_errno("pledge");
467 069bbb86 2022-03-07 thomas 		got_privsep_send_error(&ibuf, err);
468 069bbb86 2022-03-07 thomas 		return 1;
469 069bbb86 2022-03-07 thomas 	}
470 762ddcd8 2022-03-09 thomas 
471 762ddcd8 2022-03-09 thomas 	/* revoke fs access */
472 762ddcd8 2022-03-09 thomas 	if (landlock_no_fs() == -1) {
473 762ddcd8 2022-03-09 thomas 		err = got_error_from_errno("landlock_no_fs");
474 762ddcd8 2022-03-09 thomas 		got_privsep_send_error(&ibuf, err);
475 762ddcd8 2022-03-09 thomas 		return 1;
476 762ddcd8 2022-03-09 thomas 	}
477 069bbb86 2022-03-07 thomas #endif
478 069bbb86 2022-03-07 thomas 
479 069bbb86 2022-03-07 thomas 	err = got_privsep_recv_imsg(&imsg, &ibuf, 0);
480 069bbb86 2022-03-07 thomas 	if (err)
481 069bbb86 2022-03-07 thomas 		goto done;
482 069bbb86 2022-03-07 thomas 	if (imsg.hdr.type != GOT_IMSG_PATCH_FILE || imsg.fd == -1) {
483 069bbb86 2022-03-07 thomas 		err = got_error(GOT_ERR_PRIVSEP_MSG);
484 069bbb86 2022-03-07 thomas 		goto done;
485 069bbb86 2022-03-07 thomas 	}
486 069bbb86 2022-03-07 thomas 
487 069bbb86 2022-03-07 thomas 	err = read_patch(&ibuf, imsg.fd);
488 069bbb86 2022-03-07 thomas 	if (err)
489 069bbb86 2022-03-07 thomas 		goto done;
490 069bbb86 2022-03-07 thomas 	if (imsg_compose(&ibuf, GOT_IMSG_PATCH_EOF, 0, 0, -1,
491 069bbb86 2022-03-07 thomas 	    NULL, 0) == -1) {
492 069bbb86 2022-03-07 thomas 		err = got_error_from_errno("imsg_compose GOT_IMSG_PATCH_EOF");
493 069bbb86 2022-03-07 thomas 		goto done;
494 069bbb86 2022-03-07 thomas 	}
495 069bbb86 2022-03-07 thomas 	err = got_privsep_flush_imsg(&ibuf);
496 069bbb86 2022-03-07 thomas done:
497 069bbb86 2022-03-07 thomas 	imsg_free(&imsg);
498 069bbb86 2022-03-07 thomas 	if (err != NULL) {
499 069bbb86 2022-03-07 thomas 		got_privsep_send_error(&ibuf, err);
500 069bbb86 2022-03-07 thomas 		err = NULL;
501 069bbb86 2022-03-07 thomas 	}
502 069bbb86 2022-03-07 thomas 	if (close(GOT_IMSG_FD_CHILD) == -1 && err == NULL)
503 069bbb86 2022-03-07 thomas 		err = got_error_from_errno("close");
504 069bbb86 2022-03-07 thomas 	if (err && err->code != GOT_ERR_PRIVSEP_PIPE)
505 069bbb86 2022-03-07 thomas 		fprintf(stderr, "%s: %s\n", getprogname(), err->msg);
506 069bbb86 2022-03-07 thomas 	return err ? 1 : 0;
507 069bbb86 2022-03-07 thomas }