2 e9ce266e 2022-03-07 op * Copyright 1986, Larry Wall
4 e9ce266e 2022-03-07 op * Redistribution and use in source and binary forms, with or without
5 e9ce266e 2022-03-07 op * modification, are permitted provided that the following condition is met:
6 e9ce266e 2022-03-07 op * 1. Redistributions of source code must retain the above copyright notice,
7 e9ce266e 2022-03-07 op * this condition and the following disclaimer.
9 e9ce266e 2022-03-07 op * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
10 e9ce266e 2022-03-07 op * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
11 e9ce266e 2022-03-07 op * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
12 e9ce266e 2022-03-07 op * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
13 e9ce266e 2022-03-07 op * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
14 e9ce266e 2022-03-07 op * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
15 e9ce266e 2022-03-07 op * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
16 e9ce266e 2022-03-07 op * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
17 e9ce266e 2022-03-07 op * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
18 e9ce266e 2022-03-07 op * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
19 e9ce266e 2022-03-07 op * SUCH DAMAGE.
23 e9ce266e 2022-03-07 op * Copyright (c) 2022 Omar Polo <op@openbsd.org>
25 e9ce266e 2022-03-07 op * Permission to use, copy, modify, and distribute this software for any
26 e9ce266e 2022-03-07 op * purpose with or without fee is hereby granted, provided that the above
27 e9ce266e 2022-03-07 op * copyright notice and this permission notice appear in all copies.
29 e9ce266e 2022-03-07 op * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
30 e9ce266e 2022-03-07 op * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
31 e9ce266e 2022-03-07 op * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
32 e9ce266e 2022-03-07 op * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
33 e9ce266e 2022-03-07 op * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
34 e9ce266e 2022-03-07 op * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
35 e9ce266e 2022-03-07 op * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
38 e9ce266e 2022-03-07 op #include <sys/types.h>
39 e9ce266e 2022-03-07 op #include <sys/queue.h>
40 e9ce266e 2022-03-07 op #include <sys/uio.h>
42 e9ce266e 2022-03-07 op #include <ctype.h>
43 e9ce266e 2022-03-07 op #include <limits.h>
44 e9ce266e 2022-03-07 op #include <paths.h>
45 e9ce266e 2022-03-07 op #include <sha1.h>
46 e9ce266e 2022-03-07 op #include <stdint.h>
47 e9ce266e 2022-03-07 op #include <stdio.h>
48 e9ce266e 2022-03-07 op #include <stdlib.h>
49 e9ce266e 2022-03-07 op #include <string.h>
50 e9ce266e 2022-03-07 op #include <unistd.h>
51 e9ce266e 2022-03-07 op #include <imsg.h>
53 e9ce266e 2022-03-07 op #include "got_error.h"
54 e9ce266e 2022-03-07 op #include "got_object.h"
56 e9ce266e 2022-03-07 op #include "got_lib_delta.h"
57 e9ce266e 2022-03-07 op #include "got_lib_object.h"
58 e9ce266e 2022-03-07 op #include "got_lib_privsep.h"
60 e9ce266e 2022-03-07 op struct imsgbuf ibuf;
62 e9ce266e 2022-03-07 op static const struct got_error *
63 e9ce266e 2022-03-07 op send_patch(const char *oldname, const char *newname)
65 e9ce266e 2022-03-07 op struct got_imsg_patch p;
67 e9ce266e 2022-03-07 op memset(&p, 0, sizeof(p));
69 e9ce266e 2022-03-07 op if (oldname != NULL)
70 e9ce266e 2022-03-07 op strlcpy(p.old, oldname, sizeof(p.old));
71 e9ce266e 2022-03-07 op if (newname != NULL)
72 e9ce266e 2022-03-07 op strlcpy(p.new, newname, sizeof(p.new));
74 e9ce266e 2022-03-07 op if (imsg_compose(&ibuf, GOT_IMSG_PATCH, 0, 0, -1,
75 e9ce266e 2022-03-07 op &p, sizeof(p)) == -1)
76 e9ce266e 2022-03-07 op return got_error_from_errno("imsg_compose GOT_IMSG_PATCH");
80 e9ce266e 2022-03-07 op static const struct got_error *
81 e9ce266e 2022-03-07 op send_patch_done(void)
83 e9ce266e 2022-03-07 op if (imsg_compose(&ibuf, GOT_IMSG_PATCH_DONE, 0, 0, -1,
84 e9ce266e 2022-03-07 op NULL, 0) == -1)
85 e9ce266e 2022-03-07 op return got_error_from_errno("imsg_compose GOT_IMSG_PATCH_EOF");
86 e9ce266e 2022-03-07 op if (imsg_flush(&ibuf) == -1)
87 e9ce266e 2022-03-07 op return got_error_from_errno("imsg_flush");
91 e9ce266e 2022-03-07 op /* based on fetchname from usr.bin/patch/util.c */
92 e9ce266e 2022-03-07 op static const struct got_error *
93 e9ce266e 2022-03-07 op filename(const char *at, char **name, int strip)
95 e9ce266e 2022-03-07 op char *fullname, *t;
99 e9ce266e 2022-03-07 op if (*at == '\0')
102 e9ce266e 2022-03-07 op while (isspace((unsigned char)*at))
105 e9ce266e 2022-03-07 op /* files can be created or removed by diffing against /dev/null */
106 e9ce266e 2022-03-07 op if (!strncmp(at, _PATH_DEVNULL, sizeof(_PATH_DEVNULL)-1))
109 e9ce266e 2022-03-07 op t = strdup(at);
110 e9ce266e 2022-03-07 op if (t == NULL)
111 e9ce266e 2022-03-07 op return got_error_from_errno("strdup");
112 e9ce266e 2022-03-07 op *name = fullname = t;
113 e9ce266e 2022-03-07 op tab = strchr(t, '\t') != NULL;
115 e9ce266e 2022-03-07 op /* strip off path components and NUL-terminate */
116 e9ce266e 2022-03-07 op for (l = strip;
117 e9ce266e 2022-03-07 op *t != '\0' && ((tab && *t != '\t') || !isspace((unsigned char)*t));
119 e9ce266e 2022-03-07 op if (t[0] == '/' && t[1] != '/' && t[1] != '\0')
120 e9ce266e 2022-03-07 op if (--l >= 0)
125 e9ce266e 2022-03-07 op *name = strdup(*name);
126 e9ce266e 2022-03-07 op free(fullname);
127 e9ce266e 2022-03-07 op if (*name == NULL)
128 e9ce266e 2022-03-07 op return got_error_from_errno("strdup");
132 e9ce266e 2022-03-07 op static const struct got_error *
133 e9ce266e 2022-03-07 op find_patch(FILE *fp)
135 e9ce266e 2022-03-07 op const struct got_error *err = NULL;
136 e9ce266e 2022-03-07 op char *old = NULL, *new = NULL;
137 e9ce266e 2022-03-07 op char *line = NULL;
138 e9ce266e 2022-03-07 op size_t linesize = 0;
139 e9ce266e 2022-03-07 op ssize_t linelen;
140 e9ce266e 2022-03-07 op int create, git = 0;
142 e9ce266e 2022-03-07 op while ((linelen = getline(&line, &linesize, fp)) != -1) {
144 e9ce266e 2022-03-07 op * Ignore the Index name like GNU and larry' patch,
145 e9ce266e 2022-03-07 op * we don't have to follow POSIX.
148 e9ce266e 2022-03-07 op if (git && !strncmp(line, "--- a/", 6)) {
150 e9ce266e 2022-03-07 op err = filename(line+6, &old, 0);
151 e9ce266e 2022-03-07 op } else if (!strncmp(line, "--- ", 4)) {
153 e9ce266e 2022-03-07 op err = filename(line+4, &old, 0);
154 e9ce266e 2022-03-07 op } else if (git && !strncmp(line, "+++ b/", 6)) {
156 e9ce266e 2022-03-07 op err = filename(line+6, &new, 0);
157 e9ce266e 2022-03-07 op } else if (!strncmp(line, "+++ ", 4)) {
159 e9ce266e 2022-03-07 op err = filename(line+4, &new, 0);
160 e9ce266e 2022-03-07 op } else if (!strncmp(line, "diff --git a/", 13))
166 e9ce266e 2022-03-07 op if (!strncmp(line, "@@ -", 4)) {
167 e9ce266e 2022-03-07 op create = !strncmp(line+4, "0,0", 3);
168 e9ce266e 2022-03-07 op if ((old == NULL && new == NULL) ||
169 e9ce266e 2022-03-07 op (!create && old == NULL))
170 e9ce266e 2022-03-07 op err = got_error(GOT_ERR_PATCH_MALFORMED);
172 e9ce266e 2022-03-07 op err = send_patch(old, new);
180 e9ce266e 2022-03-07 op /* rewind to previous line */
181 e9ce266e 2022-03-07 op if (fseek(fp, linelen * -1, SEEK_CUR) == -1)
182 e9ce266e 2022-03-07 op err = got_error_from_errno("fseek");
188 e9ce266e 2022-03-07 op if (ferror(fp) && err == NULL)
189 e9ce266e 2022-03-07 op err = got_error_from_errno("getline");
190 e9ce266e 2022-03-07 op if (feof(fp) && err == NULL)
191 e9ce266e 2022-03-07 op err = got_error(GOT_ERR_NO_PATCH);
195 e9ce266e 2022-03-07 op static const struct got_error *
196 e9ce266e 2022-03-07 op strtolnum(char **str, long *n)
199 e9ce266e 2022-03-07 op const char *errstr;
201 e9ce266e 2022-03-07 op for (p = *str; isdigit((unsigned char)*p); ++p)
207 e9ce266e 2022-03-07 op *n = strtonum(*str, 0, LONG_MAX, &errstr);
208 e9ce266e 2022-03-07 op if (errstr != NULL)
209 e9ce266e 2022-03-07 op return got_error(GOT_ERR_PATCH_MALFORMED);
216 e9ce266e 2022-03-07 op static const struct got_error *
217 e9ce266e 2022-03-07 op parse_hdr(char *s, int *ok, struct got_imsg_patch_hunk *hdr)
219 e9ce266e 2022-03-07 op static const struct got_error *err = NULL;
222 e9ce266e 2022-03-07 op if (strncmp(s, "@@ -", 4)) {
230 e9ce266e 2022-03-07 op err = strtolnum(&s, &hdr->oldfrom);
233 e9ce266e 2022-03-07 op if (*s == ',') {
235 e9ce266e 2022-03-07 op err = strtolnum(&s, &hdr->oldlines);
239 e9ce266e 2022-03-07 op hdr->oldlines = 1;
241 e9ce266e 2022-03-07 op if (*s == ' ')
244 e9ce266e 2022-03-07 op if (*s != '+' || !*++s)
245 e9ce266e 2022-03-07 op return got_error(GOT_ERR_PATCH_MALFORMED);
246 e9ce266e 2022-03-07 op err = strtolnum(&s, &hdr->newfrom);
249 e9ce266e 2022-03-07 op if (*s == ',') {
251 e9ce266e 2022-03-07 op err = strtolnum(&s, &hdr->newlines);
255 e9ce266e 2022-03-07 op hdr->newlines = 1;
257 e9ce266e 2022-03-07 op if (*s == ' ')
260 e9ce266e 2022-03-07 op if (*s != '@')
261 e9ce266e 2022-03-07 op return got_error(GOT_ERR_PATCH_MALFORMED);
263 e9ce266e 2022-03-07 op if (hdr->oldfrom >= LONG_MAX - hdr->oldlines ||
264 e9ce266e 2022-03-07 op hdr->newfrom >= LONG_MAX - hdr->newlines ||
265 e9ce266e 2022-03-07 op /* not so sure about this one */
266 e9ce266e 2022-03-07 op hdr->oldlines >= LONG_MAX - hdr->newlines - 1)
267 e9ce266e 2022-03-07 op return got_error(GOT_ERR_PATCH_MALFORMED);
269 e9ce266e 2022-03-07 op if (hdr->oldlines == 0) {
270 e9ce266e 2022-03-07 op /* larry says to "do append rather than insert"; I don't
271 e9ce266e 2022-03-07 op * quite get it, but i trust him.
273 e9ce266e 2022-03-07 op hdr->oldfrom++;
276 e9ce266e 2022-03-07 op if (imsg_compose(&ibuf, GOT_IMSG_PATCH_HUNK, 0, 0, -1,
277 e9ce266e 2022-03-07 op hdr, sizeof(*hdr)) == -1)
278 e9ce266e 2022-03-07 op return got_error_from_errno(
279 e9ce266e 2022-03-07 op "imsg_compose GOT_IMSG_PATCH_HUNK");
283 e9ce266e 2022-03-07 op static const struct got_error *
284 e9ce266e 2022-03-07 op send_line(const char *line)
286 e9ce266e 2022-03-07 op static const struct got_error *err = NULL;
287 e9ce266e 2022-03-07 op char *p = NULL;
289 e9ce266e 2022-03-07 op if (*line != '+' && *line != '-' && *line != ' ') {
290 e9ce266e 2022-03-07 op if (asprintf(&p, " %s", line) == -1)
291 e9ce266e 2022-03-07 op return got_error_from_errno("asprintf");
295 e9ce266e 2022-03-07 op if (imsg_compose(&ibuf, GOT_IMSG_PATCH_LINE, 0, 0, -1,
296 e9ce266e 2022-03-07 op line, strlen(line)+1) == -1)
297 e9ce266e 2022-03-07 op err = got_error_from_errno(
298 e9ce266e 2022-03-07 op "imsg_compose GOT_IMSG_PATCH_LINE");
304 e9ce266e 2022-03-07 op static const struct got_error *
305 e9ce266e 2022-03-07 op parse_hunk(FILE *fp, int *ok)
307 e9ce266e 2022-03-07 op static const struct got_error *err = NULL;
308 e9ce266e 2022-03-07 op struct got_imsg_patch_hunk hdr;
309 e9ce266e 2022-03-07 op char *line = NULL, ch;
310 e9ce266e 2022-03-07 op size_t linesize = 0;
311 e9ce266e 2022-03-07 op ssize_t linelen;
312 e9ce266e 2022-03-07 op long leftold, leftnew;
314 e9ce266e 2022-03-07 op linelen = getline(&line, &linesize, fp);
315 e9ce266e 2022-03-07 op if (linelen == -1) {
320 e9ce266e 2022-03-07 op err = parse_hdr(line, ok, &hdr);
324 e9ce266e 2022-03-07 op if (fseek(fp, linelen * -1, SEEK_CUR) == -1)
325 e9ce266e 2022-03-07 op err = got_error_from_errno("fseek");
329 e9ce266e 2022-03-07 op leftold = hdr.oldlines;
330 e9ce266e 2022-03-07 op leftnew = hdr.newlines;
332 e9ce266e 2022-03-07 op while (leftold > 0 || leftnew > 0) {
333 e9ce266e 2022-03-07 op linelen = getline(&line, &linesize, fp);
334 e9ce266e 2022-03-07 op if (linelen == -1) {
335 e9ce266e 2022-03-07 op if (ferror(fp)) {
336 e9ce266e 2022-03-07 op err = got_error_from_errno("getline");
340 e9ce266e 2022-03-07 op /* trailing newlines may be chopped */
341 e9ce266e 2022-03-07 op if (leftold < 3 && leftnew < 3) {
346 e9ce266e 2022-03-07 op err = got_error(GOT_ERR_PATCH_TRUNCATED);
350 e9ce266e 2022-03-07 op /* usr.bin/patch allows '=' as context char */
351 e9ce266e 2022-03-07 op if (*line == '=')
355 e9ce266e 2022-03-07 op if (ch == '\t' || ch == '\n')
356 e9ce266e 2022-03-07 op ch = ' '; /* the space got eaten */
358 e9ce266e 2022-03-07 op switch (ch) {
370 e9ce266e 2022-03-07 op err = got_error(GOT_ERR_PATCH_MALFORMED);
374 e9ce266e 2022-03-07 op if (leftold < 0 || leftnew < 0) {
375 e9ce266e 2022-03-07 op err = got_error(GOT_ERR_PATCH_MALFORMED);
379 e9ce266e 2022-03-07 op err = send_line(line);
389 e9ce266e 2022-03-07 op static const struct got_error *
390 e9ce266e 2022-03-07 op read_patch(struct imsgbuf *ibuf, int fd)
392 e9ce266e 2022-03-07 op const struct got_error *err = NULL;
394 e9ce266e 2022-03-07 op int ok, patch_found = 0;
396 e9ce266e 2022-03-07 op if ((fp = fdopen(fd, "r")) == NULL) {
397 e9ce266e 2022-03-07 op err = got_error_from_errno("fdopen");
402 e9ce266e 2022-03-07 op while (!feof(fp)) {
403 e9ce266e 2022-03-07 op err = find_patch(fp);
407 e9ce266e 2022-03-07 op patch_found = 1;
409 e9ce266e 2022-03-07 op err = parse_hunk(fp, &ok);
413 e9ce266e 2022-03-07 op err = send_patch_done();
424 e9ce266e 2022-03-07 op /* ignore trailing gibberish */
425 e9ce266e 2022-03-07 op if (err != NULL && err->code == GOT_ERR_NO_PATCH && patch_found)
432 e9ce266e 2022-03-07 op main(int argc, char **argv)
434 e9ce266e 2022-03-07 op const struct got_error *err = NULL;
435 e9ce266e 2022-03-07 op struct imsg imsg;
437 e9ce266e 2022-03-07 op static int attached;
438 e9ce266e 2022-03-07 op while (!attached)
442 e9ce266e 2022-03-07 op imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
443 e9ce266e 2022-03-07 op #ifndef PROFILE
444 e9ce266e 2022-03-07 op /* revoke access to most system calls */
445 e9ce266e 2022-03-07 op if (pledge("stdio recvfd", NULL) == -1) {
446 e9ce266e 2022-03-07 op err = got_error_from_errno("pledge");
447 e9ce266e 2022-03-07 op got_privsep_send_error(&ibuf, err);
452 e9ce266e 2022-03-07 op err = got_privsep_recv_imsg(&imsg, &ibuf, 0);
455 e9ce266e 2022-03-07 op if (imsg.hdr.type != GOT_IMSG_PATCH_FILE || imsg.fd == -1) {
456 e9ce266e 2022-03-07 op err = got_error(GOT_ERR_PRIVSEP_MSG);
460 e9ce266e 2022-03-07 op err = read_patch(&ibuf, imsg.fd);
463 e9ce266e 2022-03-07 op if (imsg_compose(&ibuf, GOT_IMSG_PATCH_EOF, 0, 0, -1,
464 e9ce266e 2022-03-07 op NULL, 0) == -1) {
465 e9ce266e 2022-03-07 op err = got_error_from_errno("imsg_compose GOT_IMSG_PATCH_EOF");
468 e9ce266e 2022-03-07 op err = got_privsep_flush_imsg(&ibuf);
470 e9ce266e 2022-03-07 op imsg_free(&imsg);
471 e9ce266e 2022-03-07 op if (err != NULL) {
472 e9ce266e 2022-03-07 op got_privsep_send_error(&ibuf, err);
475 e9ce266e 2022-03-07 op if (close(GOT_IMSG_FD_CHILD) == -1 && err == NULL)
476 e9ce266e 2022-03-07 op err = got_error_from_errno("close");
477 e9ce266e 2022-03-07 op if (err && err->code != GOT_ERR_PRIVSEP_PIPE)
478 e9ce266e 2022-03-07 op fprintf(stderr, "%s: %s\n", getprogname(), err->msg);
479 e9ce266e 2022-03-07 op return err ? 1 : 0;