Annotation of src/usr.bin/rsync/main.c, Revision 1.21
1.21 ! deraadt 1: /* $Id: main.c,v 1.20 2019/02/16 17:05:21 deraadt Exp $ */
1.1 benno 2: /*
3: * Copyright (c) 2019 Kristaps Dzonsons <kristaps@bsd.lv>
4: *
5: * Permission to use, copy, modify, and distribute this software for any
6: * purpose with or without fee is hereby granted, provided that the above
7: * copyright notice and this permission notice appear in all copies.
8: *
9: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16: */
17: #include <sys/stat.h>
18: #include <sys/socket.h>
19: #include <sys/wait.h>
20:
21: #include <assert.h>
22: #include <err.h>
23: #include <getopt.h>
24: #include <stdint.h>
25: #include <stdio.h>
26: #include <stdlib.h>
27: #include <string.h>
28: #include <unistd.h>
29:
30: #include "extern.h"
31:
32: static void
33: fargs_free(struct fargs *p)
34: {
35: size_t i;
36:
1.6 deraadt 37: if (p == NULL)
1.1 benno 38: return;
39:
1.6 deraadt 40: if (p->sources != NULL)
1.1 benno 41: for (i = 0; i < p->sourcesz; i++)
42: free(p->sources[i]);
43:
44: free(p->sources);
45: free(p->sink);
46: free(p->host);
47: free(p);
48: }
49:
50: /*
51: * A remote host is has a colon before the first path separator.
52: * This works for rsh remote hosts (host:/foo/bar), implicit rsync
53: * remote hosts (host::/foo/bar), and explicit (rsync://host/foo).
54: * Return zero if local, non-zero if remote.
55: */
56: static int
57: fargs_is_remote(const char *v)
58: {
59: size_t pos;
60:
61: pos = strcspn(v, ":/");
1.6 deraadt 62: return v[pos] == ':';
1.1 benno 63: }
64:
65: /*
66: * Test whether a remote host is specifically an rsync daemon.
67: * Return zero if not, non-zero if so.
68: */
69: static int
70: fargs_is_daemon(const char *v)
71: {
72: size_t pos;
73:
1.6 deraadt 74: if (strncasecmp(v, "rsync://", 8) == 0)
1.1 benno 75: return 1;
76:
77: pos = strcspn(v, ":/");
1.6 deraadt 78: return v[pos] == ':' && v[pos + 1] == ':';
1.1 benno 79: }
80:
81: /*
82: * Take the command-line filenames (e.g., rsync foo/ bar/ baz/) and
83: * determine our operating mode.
84: * For example, if the first argument is a remote file, this means that
85: * we're going to transfer from the remote to the local.
86: * We also make sure that the arguments are consistent, that is, if
87: * we're going to transfer from the local to the remote, that no
88: * filenames for the local transfer indicate remote hosts.
89: * Always returns the parsed and sanitised options.
90: */
91: static struct fargs *
92: fargs_parse(size_t argc, char *argv[])
93: {
94: struct fargs *f = NULL;
95: char *cp;
96: size_t i, j, len = 0;
97:
98: /* Allocations. */
99:
1.6 deraadt 100: if ((f = calloc(1, sizeof(struct fargs))) == NULL)
1.1 benno 101: err(EXIT_FAILURE, "calloc");
102:
103: f->sourcesz = argc - 1;
1.6 deraadt 104: if ((f->sources = calloc(f->sourcesz, sizeof(char *))) == NULL)
1.1 benno 105: err(EXIT_FAILURE, "calloc");
106:
107: for (i = 0; i < argc - 1; i++)
1.6 deraadt 108: if ((f->sources[i] = strdup(argv[i])) == NULL)
1.1 benno 109: err(EXIT_FAILURE, "strdup");
110:
1.6 deraadt 111: if ((f->sink = strdup(argv[i])) == NULL)
1.1 benno 112: err(EXIT_FAILURE, "strdup");
113:
114: /*
115: * Test files for its locality.
116: * If the last is a remote host, then we're sending from the
117: * local to the remote host ("sender" mode).
118: * If the first, remote to local ("receiver" mode).
119: * If neither, a local transfer in sender style.
120: */
121:
122: f->mode = FARGS_SENDER;
123:
124: if (fargs_is_remote(f->sink)) {
125: f->mode = FARGS_SENDER;
1.6 deraadt 126: if ((f->host = strdup(f->sink)) == NULL)
1.1 benno 127: err(EXIT_FAILURE, "strdup");
128: }
129:
130: if (fargs_is_remote(f->sources[0])) {
1.6 deraadt 131: if (f->host != NULL)
1.1 benno 132: errx(EXIT_FAILURE, "both source and "
133: "destination cannot be remote files");
134: f->mode = FARGS_RECEIVER;
1.6 deraadt 135: if ((f->host = strdup(f->sources[0])) == NULL)
1.1 benno 136: err(EXIT_FAILURE, "strdup");
137: }
138:
1.6 deraadt 139: if (f->host != NULL) {
140: if (strncasecmp(f->host, "rsync://", 8) == 0) {
1.1 benno 141: /* rsync://host/module[/path] */
142: f->remote = 1;
143: len = strlen(f->host) - 8 + 1;
144: memmove(f->host, f->host + 8, len);
1.6 deraadt 145: if ((cp = strchr(f->host, '/')) == NULL)
1.1 benno 146: errx(EXIT_FAILURE, "rsync protocol "
147: "requires a module name");
148: *cp++ = '\0';
149: f->module = cp;
1.6 deraadt 150: if ((cp = strchr(f->module, '/')) != NULL)
1.1 benno 151: *cp = '\0';
152: } else {
153: /* host:[/path] */
154: cp = strchr(f->host, ':');
1.6 deraadt 155: assert(cp != NULL);
1.1 benno 156: *cp++ = '\0';
1.6 deraadt 157: if (*cp == ':') {
1.1 benno 158: /* host::module[/path] */
159: f->remote = 1;
160: f->module = ++cp;
161: cp = strchr(f->module, '/');
1.6 deraadt 162: if (cp != NULL)
1.1 benno 163: *cp = '\0';
164: }
165: }
1.6 deraadt 166: if ((len = strlen(f->host)) == 0)
1.1 benno 167: errx(EXIT_FAILURE, "empty remote host");
1.6 deraadt 168: if (f->remote && strlen(f->module) == 0)
1.1 benno 169: errx(EXIT_FAILURE, "empty remote module");
170: }
171:
172: /* Make sure we have the same "hostspec" for all files. */
173:
1.4 deraadt 174: if (!f->remote) {
1.6 deraadt 175: if (f->mode == FARGS_SENDER)
1.1 benno 176: for (i = 0; i < f->sourcesz; i++) {
1.4 deraadt 177: if (!fargs_is_remote(f->sources[i]))
1.1 benno 178: continue;
179: errx(EXIT_FAILURE, "remote file in "
180: "list of local sources: %s",
181: f->sources[i]);
182: }
1.6 deraadt 183: if (f->mode == FARGS_RECEIVER)
1.1 benno 184: for (i = 0; i < f->sourcesz; i++) {
185: if (fargs_is_remote(f->sources[i]) &&
1.4 deraadt 186: !fargs_is_daemon(f->sources[i]))
1.1 benno 187: continue;
188: if (fargs_is_daemon(f->sources[i]))
189: errx(EXIT_FAILURE, "remote "
190: "daemon in list of "
191: "remote sources: %s",
192: f->sources[i]);
193: errx(EXIT_FAILURE, "local file in "
194: "list of remote sources: %s",
195: f->sources[i]);
196: }
197: } else {
1.6 deraadt 198: if (f->mode != FARGS_RECEIVER)
1.1 benno 199: errx(EXIT_FAILURE, "sender mode for remote "
200: "daemon receivers not yet supported");
201: for (i = 0; i < f->sourcesz; i++) {
202: if (fargs_is_daemon(f->sources[i]))
203: continue;
204: errx(EXIT_FAILURE, "non-remote daemon file "
205: "in list of remote daemon sources: "
206: "%s", f->sources[i]);
207: }
208: }
209:
210: /*
211: * If we're not remote and a sender, strip our hostname.
212: * Then exit if we're a sender or a local connection.
213: */
214:
1.4 deraadt 215: if (!f->remote) {
1.6 deraadt 216: if (f->host == NULL)
1.1 benno 217: return f;
1.6 deraadt 218: if (f->mode == FARGS_SENDER) {
219: assert(f->host != NULL);
1.1 benno 220: assert(len > 0);
221: j = strlen(f->sink);
222: memmove(f->sink, f->sink + len + 1, j - len);
223: return f;
1.6 deraadt 224: } else if (f->mode != FARGS_RECEIVER)
1.1 benno 225: return f;
226: }
227:
228: /*
229: * Now strip the hostnames from the remote host.
230: * rsync://host/module/path -> module/path
231: * host::module/path -> module/path
232: * host:path -> path
233: * Also make sure that the remote hosts are the same.
234: */
235:
1.6 deraadt 236: assert(f->host != NULL);
1.1 benno 237: assert(len > 0);
238:
239: for (i = 0; i < f->sourcesz; i++) {
240: cp = f->sources[i];
241: j = strlen(cp);
242: if (f->remote &&
1.6 deraadt 243: strncasecmp(cp, "rsync://", 8) == 0) {
1.1 benno 244: /* rsync://path */
245: cp += 8;
246: if (strncmp(cp, f->host, len) ||
1.11 benno 247: (cp[len] != '/' && cp[len] != '\0'))
1.1 benno 248: errx(EXIT_FAILURE, "different remote "
249: "host: %s", f->sources[i]);
250: memmove(f->sources[i],
251: f->sources[i] + len + 8 + 1,
252: j - len - 8);
1.6 deraadt 253: } else if (f->remote && strncmp(cp, "::", 2) == 0) {
1.1 benno 254: /* ::path */
255: memmove(f->sources[i],
256: f->sources[i] + 2, j - 1);
257: } else if (f->remote) {
258: /* host::path */
259: if (strncmp(cp, f->host, len) ||
1.6 deraadt 260: (cp[len] != ':' && cp[len] != '\0'))
1.1 benno 261: errx(EXIT_FAILURE, "different remote "
262: "host: %s", f->sources[i]);
1.11 benno 263: memmove(f->sources[i], f->sources[i] + len + 2,
264: j - len - 1);
1.6 deraadt 265: } else if (cp[0] == ':') {
1.1 benno 266: /* :path */
267: memmove(f->sources[i], f->sources[i] + 1, j);
268: } else {
269: /* host:path */
270: if (strncmp(cp, f->host, len) ||
1.6 deraadt 271: (cp[len] != ':' && cp[len] != '\0'))
1.1 benno 272: errx(EXIT_FAILURE, "different remote "
273: "host: %s", f->sources[i]);
274: memmove(f->sources[i],
275: f->sources[i] + len + 1, j - len);
276: }
277: }
278:
279: return f;
280: }
281:
282: int
283: main(int argc, char *argv[])
284: {
285: struct opts opts;
1.2 benno 286: pid_t child;
1.5 deraadt 287: int fds[2], c, st;
1.1 benno 288: struct fargs *fargs;
289: struct option lopts[] = {
1.21 ! deraadt 290: { "rsh", required_argument, NULL, 'e' },
1.8 deraadt 291: { "rsync-path", required_argument, NULL, 1 },
292: { "sender", no_argument, &opts.sender, 1 },
293: { "server", no_argument, &opts.server, 1 },
1.20 deraadt 294: { "dry-run", no_argument, &opts.dry_run, 1 },
295: { "version", no_argument, NULL, 2 },
1.21 ! deraadt 296: { "help", no_argument, NULL, 'h' },
1.20 deraadt 297: { "delete", no_argument, &opts.del, 1 },
298: { "no-delete", no_argument, &opts.del, 0 },
299: { "devices", no_argument, &opts.devices, 1 },
300: { "no-devices", no_argument, &opts.devices, 0 },
301: { "group", no_argument, &opts.preserve_gids, 1 },
302: { "no-group", no_argument, &opts.preserve_gids, 0 },
1.8 deraadt 303: { "links", no_argument, &opts.preserve_links, 1 },
1.20 deraadt 304: { "no-links", no_argument, &opts.preserve_links, 0 },
305: { "owner", no_argument, &opts.preserve_uids, 1 },
306: { "no-owner", no_argument, &opts.preserve_uids, 0 },
1.8 deraadt 307: { "perms", no_argument, &opts.preserve_perms, 1 },
1.20 deraadt 308: { "no-perms", no_argument, &opts.preserve_perms, 0 },
1.8 deraadt 309: { "recursive", no_argument, &opts.recursive, 1 },
1.20 deraadt 310: { "no-recursive", no_argument, &opts.recursive, 0 },
1.19 florian 311: { "specials", no_argument, &opts.specials, 1 },
1.21 ! deraadt 312: { "no-specials", no_argument, &opts.specials, 0 },
1.20 deraadt 313: { "times", no_argument, &opts.preserve_times, 1 },
314: { "no-times", no_argument, &opts.preserve_times, 0 },
315: { "verbose", no_argument, &opts.verbose, 1 },
316: { "no-verbose", no_argument, &opts.verbose, 0 },
1.8 deraadt 317: { NULL, 0, NULL, 0 }};
1.1 benno 318:
319: /* Global pledge. */
320:
1.19 florian 321: if (pledge("stdio unix rpath wpath cpath dpath inet fattr chown dns getpw proc exec unveil",
1.6 deraadt 322: NULL) == -1)
1.1 benno 323: err(EXIT_FAILURE, "pledge");
324:
325: memset(&opts, 0, sizeof(struct opts));
326:
1.21 ! deraadt 327: while ((c = getopt_long(argc, argv, "Dae:ghlnoprtv", lopts, NULL)) != -1) {
1.1 benno 328: switch (c) {
1.19 florian 329: case 'D':
330: opts.devices = 1;
331: opts.specials = 1;
332: break;
333: case 'a':
334: opts.recursive = 1;
335: opts.preserve_links = 1;
336: opts.preserve_perms = 1;
337: opts.preserve_times = 1;
338: opts.preserve_gids = 1;
339: opts.preserve_uids = 1;
340: opts.devices = 1;
341: opts.specials = 1;
342: break;
1.1 benno 343: case 'e':
1.9 deraadt 344: opts.ssh_prog = optarg;
1.1 benno 345: /* Ignore. */
346: break;
1.10 benno 347: case 'g':
348: opts.preserve_gids = 1;
349: break;
1.1 benno 350: case 'l':
351: opts.preserve_links = 1;
352: break;
353: case 'n':
354: opts.dry_run = 1;
355: break;
1.13 florian 356: case 'o':
357: opts.preserve_uids = 1;
358: break;
1.1 benno 359: case 'p':
360: opts.preserve_perms = 1;
361: break;
362: case 'r':
363: opts.recursive = 1;
364: break;
365: case 't':
366: opts.preserve_times = 1;
367: break;
368: case 'v':
369: opts.verbose++;
370: break;
371: case 0:
372: /* Non-NULL flag values (e.g., --sender). */
373: break;
374: case 1:
375: opts.rsync_path = optarg;
376: break;
1.17 deraadt 377: case 2:
378: fprintf(stderr, "openrsync: protocol version %u\n",
379: RSYNC_PROTOCOL);
380: exit(0);
1.21 ! deraadt 381: case 'h':
1.1 benno 382: default:
383: goto usage;
384: }
385: }
386:
387: argc -= optind;
388: argv += optind;
389:
390: /* FIXME: reference implementation rsync accepts this. */
391:
392: if (argc < 2)
393: goto usage;
394:
395: /*
396: * This is what happens when we're started with the "hidden"
397: * --server option, which is invoked for the rsync on the remote
398: * host by the parent.
399: */
400:
401: if (opts.server) {
1.19 florian 402: if (pledge("stdio unix rpath wpath cpath dpath fattr chown getpw unveil", NULL) == -1)
1.1 benno 403: err(EXIT_FAILURE, "pledge");
404: c = rsync_server(&opts, (size_t)argc, argv);
405: return c ? EXIT_SUCCESS : EXIT_FAILURE;
406: }
407:
408: /*
409: * Now we know that we're the client on the local machine
410: * invoking rsync(1).
411: * At this point, we need to start the client and server
412: * initiation logic.
413: * The client is what we continue running on this host; the
414: * server is what we'll use to connect to the remote and
415: * invoke rsync with the --server option.
416: */
417:
418: fargs = fargs_parse(argc, argv);
1.6 deraadt 419: assert(fargs != NULL);
1.1 benno 420:
421: /*
422: * If we're contacting an rsync:// daemon, then we don't need to
423: * fork, because we won't start a server ourselves.
424: * Route directly into the socket code, in that case.
425: */
426:
427: if (fargs->remote) {
1.6 deraadt 428: assert(fargs->mode == FARGS_RECEIVER);
1.19 florian 429: if (pledge("stdio unix rpath wpath cpath dpath inet fattr chown dns getpw unveil",
1.6 deraadt 430: NULL) == -1)
1.1 benno 431: err(EXIT_FAILURE, "pledge");
432: c = rsync_socket(&opts, fargs);
433: fargs_free(fargs);
434: return c ? EXIT_SUCCESS : EXIT_FAILURE;
435: }
436:
437: /* Drop the dns/inet possibility. */
438:
1.19 florian 439: if (pledge("stdio unix rpath wpath cpath dpath fattr chown getpw proc exec unveil",
1.6 deraadt 440: NULL) == -1)
1.1 benno 441: err(EXIT_FAILURE, "pledge");
442:
443: /* Create a bidirectional socket and start our child. */
444:
1.6 deraadt 445: if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK, 0, fds) == -1)
1.1 benno 446: err(EXIT_FAILURE, "socketpair");
447:
1.6 deraadt 448: if ((child = fork()) == -1) {
1.1 benno 449: close(fds[0]);
450: close(fds[1]);
451: err(EXIT_FAILURE, "fork");
452: }
453:
454: /* Drop the fork possibility. */
455:
1.19 florian 456: if (pledge("stdio unix rpath wpath cpath dpath fattr chown getpw exec unveil", NULL) == -1)
1.1 benno 457: err(EXIT_FAILURE, "pledge");
458:
1.6 deraadt 459: if (child == 0) {
1.1 benno 460: close(fds[0]);
461: fds[0] = -1;
1.6 deraadt 462: if (pledge("stdio exec", NULL) == -1)
1.1 benno 463: err(EXIT_FAILURE, "pledge");
464: rsync_child(&opts, fds[1], fargs);
465: /* NOTREACHED */
466: }
467:
468: close(fds[1]);
469: fds[1] = -1;
1.19 florian 470: if (pledge("stdio unix rpath wpath cpath dpath fattr chown getpw unveil", NULL) == -1)
1.1 benno 471: err(EXIT_FAILURE, "pledge");
472: c = rsync_client(&opts, fds[0], fargs);
473: fargs_free(fargs);
474:
475: /*
476: * If the client has an error and exits, the server may be
477: * sitting around waiting to get data while we waitpid().
478: * So close the connection here so that they don't hang.
479: */
480:
1.4 deraadt 481: if (!c) {
1.1 benno 482: close(fds[0]);
483: fds[0] = -1;
484: }
485:
1.6 deraadt 486: if (waitpid(child, &st, 0) == -1)
1.1 benno 487: err(EXIT_FAILURE, "waitpid");
1.6 deraadt 488: if (!(WIFEXITED(st) && WEXITSTATUS(st) == EXIT_SUCCESS))
1.1 benno 489: c = 0;
490:
1.6 deraadt 491: if (fds[0] != -1)
1.1 benno 492: close(fds[0]);
493: return c ? EXIT_SUCCESS : EXIT_FAILURE;
494: usage:
1.19 florian 495: fprintf(stderr, "usage: %s [-Daglnoprtv] "
1.9 deraadt 496: "[-e ssh-prog] [--delete] [--rsync-path=prog] src ... dst\n",
1.1 benno 497: getprogname());
498: return EXIT_FAILURE;
499: }
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