Annotation of src/usr.bin/rsync/receiver.c, Revision 1.32
1.32 ! claudio 1: /* $OpenBSD: receiver.c,v 1.31 2021/10/24 21:24:17 deraadt Exp $ */
1.1 benno 2:
3: /*
4: * Copyright (c) 2019 Kristaps Dzonsons <kristaps@bsd.lv>
1.15 florian 5: * Copyright (c) 2019 Florian Obser <florian@openbsd.org>
1.1 benno 6: *
7: * Permission to use, copy, modify, and distribute this software for any
8: * purpose with or without fee is hereby granted, provided that the above
9: * copyright notice and this permission notice appear in all copies.
10: *
11: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18: */
19: #include <sys/mman.h>
20: #include <sys/stat.h>
21:
22: #include <assert.h>
1.27 claudio 23: #include <err.h>
1.1 benno 24: #include <errno.h>
25: #include <fcntl.h>
26: #include <inttypes.h>
27: #include <math.h>
28: #include <poll.h>
29: #include <stdio.h>
30: #include <stdlib.h>
31: #include <string.h>
32: #include <time.h>
33: #include <unistd.h>
34:
35: #include "extern.h"
36:
37: enum pfdt {
38: PFD_SENDER_IN = 0, /* input from the sender */
39: PFD_UPLOADER_IN, /* uploader input from a local file */
40: PFD_DOWNLOADER_IN, /* downloader input from a local file */
41: PFD_SENDER_OUT, /* output to the sender */
42: PFD__MAX
43: };
1.7 florian 44:
45: int
46: rsync_set_metadata(struct sess *sess, int newfile,
47: int fd, const struct flist *f, const char *path)
48: {
1.8 florian 49: uid_t uid = (uid_t)-1;
50: gid_t gid = (gid_t)-1;
1.22 deraadt 51: mode_t mode;
1.20 cheloha 52: struct timespec ts[2];
1.7 florian 53:
1.22 deraadt 54: /* Conditionally adjust file modification time. */
55:
56: if (sess->opts->preserve_times) {
57: ts[0].tv_nsec = UTIME_NOW;
58: ts[1].tv_sec = f->st.mtime;
59: ts[1].tv_nsec = 0;
60: if (futimens(fd, ts) == -1) {
1.23 benno 61: ERR("%s: futimens", path);
1.22 deraadt 62: return 0;
63: }
1.23 benno 64: LOG4("%s: updated date", f->path);
1.22 deraadt 65: }
66:
1.7 florian 67: /*
68: * Conditionally adjust identifiers.
69: * If we have an EPERM, report it but continue on: this just
70: * means that we're mapping into an unknown (or disallowed)
71: * group identifier.
72: */
1.8 florian 73: if (getuid() == 0 && sess->opts->preserve_uids)
74: uid = f->st.uid;
75: if (sess->opts->preserve_gids)
76: gid = f->st.gid;
77:
1.22 deraadt 78: mode = f->st.mode;
1.8 florian 79: if (uid != (uid_t)-1 || gid != (gid_t)-1) {
1.7 florian 80: if (fchown(fd, uid, gid) == -1) {
81: if (errno != EPERM) {
1.23 benno 82: ERR("%s: fchown", path);
1.7 florian 83: return 0;
84: }
1.22 deraadt 85: if (getuid() == 0)
1.23 benno 86: WARNX("%s: identity unknown or not available "
1.22 deraadt 87: "to user.group: %u.%u", f->path, uid, gid);
1.7 florian 88: } else
1.23 benno 89: LOG4("%s: updated uid and/or gid", f->path);
1.22 deraadt 90: mode &= ~(S_ISTXT | S_ISUID | S_ISGID);
1.13 florian 91: }
92:
93: /* Conditionally adjust file permissions. */
94:
95: if (newfile || sess->opts->preserve_perms) {
1.22 deraadt 96: if (fchmod(fd, mode) == -1) {
1.23 benno 97: ERR("%s: fchmod", path);
1.13 florian 98: return 0;
99: }
1.23 benno 100: LOG4("%s: updated permissions", f->path);
1.7 florian 101: }
102:
103: return 1;
104: }
1.1 benno 105:
1.14 florian 106: int
107: rsync_set_metadata_at(struct sess *sess, int newfile, int rootfd,
108: const struct flist *f, const char *path)
109: {
110: uid_t uid = (uid_t)-1;
111: gid_t gid = (gid_t)-1;
1.22 deraadt 112: mode_t mode;
1.20 cheloha 113: struct timespec ts[2];
1.14 florian 114:
1.22 deraadt 115: /* Conditionally adjust file modification time. */
116:
1.32 ! claudio 117: if (sess->opts->preserve_times &&
! 118: !(S_ISLNK(f->st.mode) && sess->opts->ignore_link_times)) {
1.22 deraadt 119: ts[0].tv_nsec = UTIME_NOW;
120: ts[1].tv_sec = f->st.mtime;
121: ts[1].tv_nsec = 0;
122: if (utimensat(rootfd, path, ts, AT_SYMLINK_NOFOLLOW) == -1) {
1.23 benno 123: ERR("%s: utimensat", path);
1.22 deraadt 124: return 0;
125: }
1.23 benno 126: LOG4("%s: updated date", f->path);
1.22 deraadt 127: }
128:
1.14 florian 129: /*
130: * Conditionally adjust identifiers.
131: * If we have an EPERM, report it but continue on: this just
132: * means that we're mapping into an unknown (or disallowed)
133: * group identifier.
134: */
135: if (getuid() == 0 && sess->opts->preserve_uids)
136: uid = f->st.uid;
137: if (sess->opts->preserve_gids)
138: gid = f->st.gid;
139:
1.22 deraadt 140: mode = f->st.mode;
1.14 florian 141: if (uid != (uid_t)-1 || gid != (gid_t)-1) {
1.22 deraadt 142: if (fchownat(rootfd, path, uid, gid, AT_SYMLINK_NOFOLLOW) == -1) {
1.14 florian 143: if (errno != EPERM) {
1.23 benno 144: ERR("%s: fchownat", path);
1.14 florian 145: return 0;
146: }
1.22 deraadt 147: if (getuid() == 0)
1.23 benno 148: WARNX("%s: identity unknown or not available "
1.22 deraadt 149: "to user.group: %u.%u", f->path, uid, gid);
1.14 florian 150: } else
1.23 benno 151: LOG4("%s: updated uid and/or gid", f->path);
1.22 deraadt 152: mode &= ~(S_ISTXT | S_ISUID | S_ISGID);
1.14 florian 153: }
154:
155: /* Conditionally adjust file permissions. */
156:
157: if (newfile || sess->opts->preserve_perms) {
1.22 deraadt 158: if (fchmodat(rootfd, path, mode, AT_SYMLINK_NOFOLLOW) == -1) {
1.23 benno 159: ERR("%s: fchmodat", path);
1.14 florian 160: return 0;
161: }
1.23 benno 162: LOG4("%s: updated permissions", f->path);
1.14 florian 163: }
164:
165: return 1;
166: }
167:
1.2 benno 168: /*
1.14 florian 169: * Pledges: unveil, unix, rpath, cpath, wpath, stdio, fattr, chown.
170: * Pledges (dry-run): -unix, -cpath, -wpath, -fattr, -chown.
1.1 benno 171: */
172: int
1.9 deraadt 173: rsync_receiver(struct sess *sess, int fdin, int fdout, const char *root)
1.1 benno 174: {
175: struct flist *fl = NULL, *dfl = NULL;
1.29 claudio 176: size_t i, flsz = 0, dflsz = 0;
1.1 benno 177: char *tofree;
178: int rc = 0, dfd = -1, phase = 0, c;
1.2 benno 179: int32_t ioerror;
1.1 benno 180: struct pollfd pfd[PFD__MAX];
181: struct download *dl = NULL;
1.2 benno 182: struct upload *ul = NULL;
1.1 benno 183: mode_t oumask;
184:
1.27 claudio 185: if (pledge("stdio unix rpath wpath cpath dpath fattr chown getpw unveil", NULL) == -1)
186: err(ERR_IPC, "pledge");
1.1 benno 187:
1.30 claudio 188: /*
189: * Create the path for our destination directory, if we're not
190: * in dry-run mode (which would otherwise crash w/the pledge).
191: * This uses our current umask: we might set the permissions on
192: * this directory in post_dir().
193: */
194:
195: if (!sess->opts->dry_run) {
196: if ((tofree = strdup(root)) == NULL)
197: err(ERR_NOMEM, NULL);
198: if (mkpath(tofree) < 0)
199: err(ERR_FILE_IO, "%s: mkpath", tofree);
200: free(tofree);
201: }
202:
203: /*
204: * Make our entire view of the file-system be limited to what's
205: * in the root directory.
206: * This prevents us from accidentally (or "under the influence")
207: * writing into other parts of the file-system.
208: */
209: if (sess->opts->basedir[0]) {
210: /*
211: * XXX just unveil everything for read
212: * Could unveil each basedir or maybe a common path
213: * also the fact that relative path are relative to the
214: * root does not help.
215: */
216: if (unveil("/", "r") == -1)
217: err(ERR_IPC, "%s: unveil", root);
218: }
219:
220: if (unveil(root, "rwc") == -1)
221: err(ERR_IPC, "%s: unveil", root);
222:
223: if (unveil(NULL, NULL) == -1)
224: err(ERR_IPC, "unveil");
225:
1.29 claudio 226: /* Client sends exclusions. */
227: if (!sess->opts->server)
228: send_rules(sess, fdout);
229:
230: /* Server receives exclusions if delete is on. */
231: if (sess->opts->server && sess->opts->del)
232: recv_rules(sess, fdin);
1.1 benno 233:
234: /*
235: * Start by receiving the file list and our mystery number.
236: * These we're going to be touching on our local system.
237: */
238:
1.4 deraadt 239: if (!flist_recv(sess, fdin, &fl, &flsz)) {
1.23 benno 240: ERRX1("flist_recv");
1.1 benno 241: goto out;
1.2 benno 242: }
243:
1.1 benno 244: /* The IO error is sent after the file list. */
245:
1.4 deraadt 246: if (!io_read_int(sess, fdin, &ioerror)) {
1.23 benno 247: ERRX1("io_read_int");
1.1 benno 248: goto out;
1.19 benno 249: } else if (ioerror != 0) {
1.23 benno 250: ERRX1("io_error is non-zero");
1.1 benno 251: goto out;
252: }
253:
1.5 deraadt 254: if (flsz == 0 && !sess->opts->server) {
1.23 benno 255: WARNX("receiver has empty file list: exiting");
1.1 benno 256: rc = 1;
257: goto out;
1.4 deraadt 258: } else if (!sess->opts->server)
1.23 benno 259: LOG1("Transfer starting: %zu files", flsz);
1.1 benno 260:
1.23 benno 261: LOG2("%s: receiver destination", root);
1.1 benno 262:
263: /*
264: * Disable umask() so we can set permissions fully.
265: * Then open the directory iff we're not in dry_run.
266: */
267:
268: oumask = umask(0);
269:
1.4 deraadt 270: if (!sess->opts->dry_run) {
1.31 deraadt 271: dfd = open(root, O_RDONLY | O_DIRECTORY);
1.27 claudio 272: if (dfd == -1)
273: err(ERR_FILE_IO, "%s: open", root);
1.1 benno 274: }
275:
276: /*
277: * Begin by conditionally getting all files we have currently
278: * available in our destination.
279: */
280:
1.2 benno 281: if (sess->opts->del &&
1.1 benno 282: sess->opts->recursive &&
1.4 deraadt 283: !flist_gen_dels(sess, root, &dfl, &dflsz, fl, flsz)) {
1.23 benno 284: ERRX1("flist_gen_local");
1.1 benno 285: goto out;
286: }
287:
288: /* If we have a local set, go for the deletion. */
289:
1.4 deraadt 290: if (!flist_del(sess, dfd, dfl, dflsz)) {
1.23 benno 291: ERRX1("flist_del");
1.1 benno 292: goto out;
293: }
294:
295: /* Initialise poll events to listen from the sender. */
296:
297: pfd[PFD_SENDER_IN].fd = fdin;
298: pfd[PFD_UPLOADER_IN].fd = -1;
299: pfd[PFD_DOWNLOADER_IN].fd = -1;
300: pfd[PFD_SENDER_OUT].fd = fdout;
301:
302: pfd[PFD_SENDER_IN].events = POLLIN;
303: pfd[PFD_UPLOADER_IN].events = POLLIN;
304: pfd[PFD_DOWNLOADER_IN].events = POLLIN;
305: pfd[PFD_SENDER_OUT].events = POLLOUT;
306:
1.24 benno 307: ul = upload_alloc(root, dfd, fdout, CSUM_LENGTH_PHASE1, fl, flsz,
308: oumask);
309:
1.5 deraadt 310: if (ul == NULL) {
1.23 benno 311: ERRX1("upload_alloc");
1.1 benno 312: goto out;
313: }
314:
315: dl = download_alloc(sess, fdin, fl, flsz, dfd);
1.5 deraadt 316: if (dl == NULL) {
1.23 benno 317: ERRX1("download_alloc");
1.1 benno 318: goto out;
319: }
320:
1.23 benno 321: LOG2("%s: ready for phase 1 data", root);
1.1 benno 322:
323: for (;;) {
1.25 claudio 324: if ((c = poll(pfd, PFD__MAX, poll_timeout)) == -1) {
1.23 benno 325: ERR("poll");
1.16 florian 326: goto out;
327: } else if (c == 0) {
1.23 benno 328: ERRX("poll: timeout");
1.1 benno 329: goto out;
1.2 benno 330: }
1.1 benno 331:
1.2 benno 332: for (i = 0; i < PFD__MAX; i++)
1.1 benno 333: if (pfd[i].revents & (POLLERR|POLLNVAL)) {
1.23 benno 334: ERRX("poll: bad fd");
1.1 benno 335: goto out;
336: } else if (pfd[i].revents & POLLHUP) {
1.23 benno 337: ERRX("poll: hangup");
1.1 benno 338: goto out;
339: }
340:
341: /*
342: * If we have a read event and we're multiplexing, we
343: * might just have error messages in the pipe.
344: * It's important to flush these out so that we don't
345: * clog the pipe.
346: * Unset our polling status if there's nothing that
347: * remains in the pipe.
348: */
349:
350: if (sess->mplex_reads &&
1.26 claudio 351: (pfd[PFD_SENDER_IN].revents & POLLIN)) {
1.4 deraadt 352: if (!io_read_flush(sess, fdin)) {
1.23 benno 353: ERRX1("io_read_flush");
1.1 benno 354: goto out;
1.5 deraadt 355: } else if (sess->mplex_read_remain == 0)
1.1 benno 356: pfd[PFD_SENDER_IN].revents &= ~POLLIN;
357: }
358:
359:
360: /*
361: * We run the uploader if we have files left to examine
362: * (i < flsz) or if we have a file that we've opened and
363: * is read to mmap.
364: */
365:
1.26 claudio 366: if ((pfd[PFD_UPLOADER_IN].revents & POLLIN) ||
367: (pfd[PFD_SENDER_OUT].revents & POLLOUT)) {
1.2 benno 368: c = rsync_uploader(ul,
369: &pfd[PFD_UPLOADER_IN].fd,
1.1 benno 370: sess, &pfd[PFD_SENDER_OUT].fd);
371: if (c < 0) {
1.23 benno 372: ERRX1("rsync_uploader");
1.1 benno 373: goto out;
374: }
375: }
376:
1.2 benno 377: /*
1.1 benno 378: * We need to run the downloader when we either have
379: * read events from the sender or an asynchronous local
380: * open is ready.
381: * XXX: we don't disable PFD_SENDER_IN like with the
382: * uploader because we might stop getting error
383: * messages, which will otherwise clog up the pipes.
384: */
385:
1.26 claudio 386: if ((pfd[PFD_SENDER_IN].revents & POLLIN) ||
387: (pfd[PFD_DOWNLOADER_IN].revents & POLLIN)) {
1.2 benno 388: c = rsync_downloader(dl, sess,
1.1 benno 389: &pfd[PFD_DOWNLOADER_IN].fd);
390: if (c < 0) {
1.23 benno 391: ERRX1("rsync_downloader");
1.1 benno 392: goto out;
1.5 deraadt 393: } else if (c == 0) {
394: assert(phase == 0);
1.1 benno 395: phase++;
1.23 benno 396: LOG2("%s: receiver ready for phase 2 data", root);
1.1 benno 397: break;
398: }
399:
400: /*
401: * FIXME: if we have any errors during the
402: * download, most notably files getting out of
403: * sync between the send and the receiver, then
404: * here we should bump our checksum length and
405: * go into the second phase.
406: */
1.2 benno 407: }
1.1 benno 408: }
409:
410: /* Properly close us out by progressing through the phases. */
411:
1.5 deraadt 412: if (phase == 1) {
1.4 deraadt 413: if (!io_write_int(sess, fdout, -1)) {
1.23 benno 414: ERRX1("io_write_int");
1.1 benno 415: goto out;
1.26 claudio 416: }
417: if (!io_read_int(sess, fdin, &ioerror)) {
1.23 benno 418: ERRX1("io_read_int");
1.1 benno 419: goto out;
1.26 claudio 420: }
421: if (ioerror != -1) {
1.23 benno 422: ERRX("expected phase ack");
1.1 benno 423: goto out;
424: }
425: }
426:
427: /*
428: * Now all of our transfers are complete, so we can fix up our
429: * directory permissions.
430: */
431:
1.4 deraadt 432: if (!rsync_uploader_tail(ul, sess)) {
1.23 benno 433: ERRX1("rsync_uploader_tail");
1.1 benno 434: goto out;
435: }
436:
437: /* Process server statistics and say good-bye. */
438:
1.4 deraadt 439: if (!sess_stats_recv(sess, fdin)) {
1.23 benno 440: ERRX1("sess_stats_recv");
1.1 benno 441: goto out;
1.26 claudio 442: }
443: if (!io_write_int(sess, fdout, -1)) {
1.23 benno 444: ERRX1("io_write_int");
1.1 benno 445: goto out;
446: }
447:
1.23 benno 448: LOG2("receiver finished updating");
1.1 benno 449: rc = 1;
450: out:
1.5 deraadt 451: if (dfd != -1)
1.1 benno 452: close(dfd);
453: upload_free(ul);
454: download_free(dl);
455: flist_free(fl, flsz);
456: flist_free(dfl, dflsz);
457: return rc;
458: }
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