]>
Commit | Line | Data |
---|---|---|
0f78b815 WD |
1 | /* |
2 | * The socket based protocol for setting up a connection with rsyncd. | |
4a7144ee | 3 | * |
0f78b815 WD |
4 | * Copyright (C) 1998-2001 Andrew Tridgell <tridge@samba.org> |
5 | * Copyright (C) 2001-2002 Martin Pool <mbp@samba.org> | |
ba2133d6 | 6 | * Copyright (C) 2002-2007 Wayne Davison |
4a7144ee | 7 | * |
a254fd97 | 8 | * This program is free software; you can redistribute it and/or modify |
8e41b68e WD |
9 | * it under the terms of the GNU General Public License as published by |
10 | * the Free Software Foundation; either version 3 of the License, or | |
11 | * (at your option) any later version. | |
4a7144ee | 12 | * |
a254fd97 MP |
13 | * This program is distributed in the hope that it will be useful, |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
4a7144ee | 17 | * |
e7c67065 | 18 | * You should have received a copy of the GNU General Public License along |
4fd842f9 | 19 | * with this program; if not, visit the http://fsf.org website. |
a254fd97 | 20 | */ |
3591c066 | 21 | |
3591c066 AT |
22 | #include "rsync.h" |
23 | ||
c0814b81 | 24 | extern int verbose; |
7a6653bc | 25 | extern int quiet; |
9ce7fc38 | 26 | extern int output_motd; |
c0814b81 | 27 | extern int list_only; |
6e195fe9 WD |
28 | extern int am_sender; |
29 | extern int am_server; | |
30 | extern int am_daemon; | |
31 | extern int am_root; | |
3591c066 | 32 | extern int rsync_port; |
3162ea6f | 33 | extern int ignore_errors; |
8dad7fc6 | 34 | extern int kluge_around_eof; |
6e195fe9 | 35 | extern int daemon_over_rsh; |
b35d0d8e | 36 | extern int sanitize_paths; |
7c2a9e76 | 37 | extern int filesfrom_fd; |
daa598df WD |
38 | extern int remote_protocol; |
39 | extern int protocol_version; | |
6e195fe9 | 40 | extern int io_timeout; |
6e195fe9 WD |
41 | extern int no_detach; |
42 | extern int default_af_hint; | |
ecc7623e WD |
43 | extern int logfile_format_has_i; |
44 | extern int logfile_format_has_o_or_i; | |
c5b7aa15 | 45 | extern mode_t orig_umask; |
6e195fe9 | 46 | extern char *bind_address; |
34937987 | 47 | extern char *sockopts; |
6e195fe9 | 48 | extern char *config_file; |
ecc7623e | 49 | extern char *logfile_format; |
bf4679e8 | 50 | extern char *files_from; |
fed1f3f4 | 51 | extern char *tmpdir; |
730df9d2 WD |
52 | extern struct chmod_mode_struct *chmod_modes; |
53 | extern struct filter_list_struct server_filter_list; | |
33cbd577 | 54 | extern char curr_dir[]; |
6e195fe9 WD |
55 | |
56 | char *auth_user; | |
18638730 | 57 | int read_only = 0; |
211bc43b | 58 | int module_id = -1; |
8840ec0f | 59 | struct chmod_mode_struct *daemon_chmod_modes; |
3591c066 | 60 | |
33cbd577 WD |
61 | /* module_dirlen is the length of the module_dir string when in daemon |
62 | * mode, not chrooted, and the path is not "/"; otherwise 0. */ | |
63 | char *module_dir = NULL; | |
e7bf7c01 WD |
64 | unsigned int module_dirlen = 0; |
65 | ||
7909e65f WD |
66 | static int rl_nulls = 0; |
67 | ||
d749eb68 WD |
68 | #ifdef HAVE_SIGACTION |
69 | static struct sigaction sigact; | |
70 | #endif | |
71 | ||
be2961da | 72 | /** |
bc363ea9 | 73 | * Run a client connected to an rsyncd. The alternative to this |
be2961da MP |
74 | * function for remote-shell connections is do_cmd(). |
75 | * | |
fdf88d75 MP |
76 | * After negotiating which module to use and reading the server's |
77 | * motd, this hands over to client_run(). Telling the server the | |
78 | * module will cause it to chroot/setuid/etc. | |
79 | * | |
80 | * Instead of doing a transfer, the client may at this stage instead | |
81 | * get a listing of remote modules and exit. | |
be2961da MP |
82 | * |
83 | * @return -1 for error in startup, or the result of client_run(). | |
d0829892 | 84 | * Either way, it eventually gets passed to exit_cleanup(). |
be2961da | 85 | **/ |
7909e65f WD |
86 | int start_socket_client(char *host, int remote_argc, char *remote_argv[], |
87 | int argc, char *argv[]) | |
3591c066 | 88 | { |
68f40ebb | 89 | int fd, ret; |
2e94e70e | 90 | char *p, *user = NULL; |
4a7144ee | 91 | |
1732b6c0 WD |
92 | /* This is redundant with code in start_inband_exchange(), but this |
93 | * short-circuits a problem in the client before we open a socket, | |
94 | * and the extra check won't hurt. */ | |
7909e65f | 95 | if (**remote_argv == '/') { |
1732b6c0 WD |
96 | rprintf(FERROR, |
97 | "ERROR: The remote path must start with a module name not a /\n"); | |
f98df1d9 AT |
98 | return -1; |
99 | } | |
100 | ||
b31c92ed | 101 | if ((p = strrchr(host, '@')) != NULL) { |
bcb7e502 AT |
102 | user = host; |
103 | host = p+1; | |
1732b6c0 | 104 | *p = '\0'; |
bcb7e502 AT |
105 | } |
106 | ||
837cbad9 WD |
107 | fd = open_socket_out_wrapped(host, rsync_port, bind_address, |
108 | default_af_hint); | |
df5cd107 | 109 | if (fd == -1) |
65417579 | 110 | exit_cleanup(RERR_SOCKETIO); |
68f40ebb | 111 | |
34937987 WD |
112 | set_socket_options(fd, sockopts); |
113 | ||
7909e65f | 114 | ret = start_inband_exchange(fd, fd, user, remote_argc, remote_argv); |
68f40ebb | 115 | |
180443af | 116 | return ret ? ret : client_run(fd, fd, -1, argc, argv); |
68f40ebb WD |
117 | } |
118 | ||
7909e65f WD |
119 | static int exchange_protocols(int f_in, int f_out, char *buf, size_t bufsiz, int am_client) |
120 | { | |
121 | int remote_sub = -1; | |
122 | #if SUBPROTOCOL_VERSION != 0 | |
123 | int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION; | |
124 | #else | |
125 | int our_sub = 0; | |
126 | #endif | |
127 | char *motd; | |
128 | ||
129 | io_printf(f_out, "@RSYNCD: %d.%d\n", protocol_version, our_sub); | |
130 | ||
131 | if (!am_client) { | |
132 | motd = lp_motd_file(); | |
133 | if (motd && *motd) { | |
134 | FILE *f = fopen(motd,"r"); | |
135 | while (f && !feof(f)) { | |
136 | int len = fread(buf, 1, bufsiz - 1, f); | |
137 | if (len > 0) | |
138 | write_buf(f_out, buf, len); | |
139 | } | |
140 | if (f) | |
141 | fclose(f); | |
142 | write_sbuf(f_out, "\n"); | |
143 | } | |
144 | } | |
145 | ||
146 | /* This strips the \n. */ | |
147 | if (!read_line_old(f_in, buf, bufsiz)) { | |
148 | if (am_client) | |
149 | rprintf(FERROR, "rsync: did not see server greeting\n"); | |
150 | return -1; | |
151 | } | |
152 | ||
153 | if (sscanf(buf, "@RSYNCD: %d.%d", &remote_protocol, &remote_sub) < 1) { | |
154 | if (am_client) | |
155 | rprintf(FERROR, "rsync: server sent \"%s\" rather than greeting\n", buf); | |
156 | else | |
157 | io_printf(f_out, "@ERROR: protocol startup error\n"); | |
158 | return -1; | |
159 | } | |
160 | ||
161 | if (remote_sub < 0) { | |
162 | if (remote_protocol == 30) { | |
163 | if (am_client) | |
164 | rprintf(FERROR, "rsync: server is speaking an incompatible beta of protocol 30\n"); | |
165 | else | |
166 | io_printf(f_out, "@ERROR: your client is speaking an incompatible beta of protocol 30\n"); | |
167 | return -1; | |
168 | } | |
169 | remote_sub = 0; | |
170 | } | |
171 | ||
172 | if (protocol_version > remote_protocol) { | |
173 | protocol_version = remote_protocol; | |
174 | if (remote_sub) | |
175 | protocol_version--; | |
176 | } else if (protocol_version == remote_protocol) { | |
177 | if (remote_sub != our_sub) | |
178 | protocol_version--; | |
179 | } | |
180 | #if SUBPROTOCOL_VERSION != 0 | |
181 | else if (protocol_version < remote_protocol) { | |
182 | if (our_sub) | |
183 | protocol_version--; | |
184 | } | |
185 | #endif | |
186 | ||
187 | if (protocol_version >= 30) | |
188 | rl_nulls = 1; | |
189 | ||
190 | return 0; | |
191 | } | |
192 | ||
193 | int start_inband_exchange(int f_in, int f_out, const char *user, int argc, char *argv[]) | |
68f40ebb WD |
194 | { |
195 | int i; | |
7909e65f | 196 | char line[BIGPATHBUFLEN]; |
68f40ebb WD |
197 | char *sargs[MAX_ARGS]; |
198 | int sargc = 0; | |
7909e65f | 199 | char *p, *path = *argv; |
68f40ebb WD |
200 | |
201 | if (argc == 0 && !am_sender) | |
9bcb2595 | 202 | list_only |= 1; |
68f40ebb WD |
203 | |
204 | if (*path == '/') { | |
1732b6c0 WD |
205 | rprintf(FERROR, |
206 | "ERROR: The remote path must start with a module name\n"); | |
68f40ebb WD |
207 | return -1; |
208 | } | |
209 | ||
2e94e70e WD |
210 | if (!user) |
211 | user = getenv("USER"); | |
212 | if (!user) | |
213 | user = getenv("LOGNAME"); | |
68f40ebb | 214 | |
7909e65f | 215 | if (exchange_protocols(f_in, f_out, line, sizeof line, 1) < 0) |
3591c066 | 216 | return -1; |
3591c066 | 217 | |
9bcb2595 WD |
218 | if (list_only && protocol_version >= 29) |
219 | list_only |= 2; | |
220 | ||
221 | /* set daemon_over_rsh to false since we need to build the | |
222 | * true set of args passed through the rsh/ssh connection; | |
223 | * this is a no-op for direct-socket-connection mode */ | |
224 | daemon_over_rsh = 0; | |
225 | server_options(sargs, &sargc); | |
226 | ||
7909e65f WD |
227 | if (sargc >= MAX_ARGS - 2) |
228 | goto arg_overflow; | |
229 | ||
9bcb2595 WD |
230 | sargs[sargc++] = "."; |
231 | ||
7909e65f WD |
232 | while (argc > 0) { |
233 | if (sargc >= MAX_ARGS - 1) { | |
234 | arg_overflow: | |
235 | rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n"); | |
236 | exit_cleanup(RERR_SYNTAX); | |
237 | } | |
238 | sargs[sargc++] = *argv++; | |
239 | argc--; | |
240 | } | |
9bcb2595 WD |
241 | |
242 | sargs[sargc] = NULL; | |
243 | ||
244 | if (verbose > 1) | |
0b515981 | 245 | print_child_argv("sending daemon args:", sargs); |
9bcb2595 | 246 | |
7909e65f WD |
247 | p = strchr(path, '/'); |
248 | if (p) *p = '\0'; | |
68f40ebb | 249 | io_printf(f_out, "%s\n", path); |
2c91d3d3 AT |
250 | if (p) *p = '/'; |
251 | ||
063393d6 MP |
252 | /* Old servers may just drop the connection here, |
253 | rather than sending a proper EXIT command. Yuck. */ | |
8dad7fc6 | 254 | kluge_around_eof = list_only && protocol_version < 25 ? 1 : 0; |
7a55d06e | 255 | |
063393d6 | 256 | while (1) { |
7909e65f | 257 | if (!read_line_old(f_in, line, sizeof line)) { |
be2961da | 258 | rprintf(FERROR, "rsync: didn't get server startup line\n"); |
3591c066 AT |
259 | return -1; |
260 | } | |
31593dd6 | 261 | |
31593dd6 | 262 | if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) { |
68f40ebb | 263 | auth_client(f_out, user, line+18); |
31593dd6 AT |
264 | continue; |
265 | } | |
31593dd6 | 266 | |
2e94e70e WD |
267 | if (strcmp(line,"@RSYNCD: OK") == 0) |
268 | break; | |
8f04bb36 | 269 | |
cae95647 MP |
270 | if (strcmp(line,"@RSYNCD: EXIT") == 0) { |
271 | /* This is sent by recent versions of the | |
272 | * server to terminate the listing of modules. | |
273 | * We don't want to go on and transfer | |
274 | * anything; just exit. */ | |
275 | exit(0); | |
276 | } | |
8f04bb36 | 277 | |
136ac7ec | 278 | if (strncmp(line, "@ERROR", 6) == 0) { |
1732b6c0 | 279 | rprintf(FERROR, "%s\n", line); |
136ac7ec MP |
280 | /* This is always fatal; the server will now |
281 | * close the socket. */ | |
180443af | 282 | return -1; |
136ac7ec | 283 | } |
180443af | 284 | |
9ce7fc38 WD |
285 | /* This might be a MOTD line or a module listing, but there is |
286 | * no way to differentiate it. The manpage mentions this. */ | |
287 | if (output_motd) | |
288 | rprintf(FINFO, "%s\n", line); | |
3591c066 | 289 | } |
8dad7fc6 | 290 | kluge_around_eof = 0; |
3591c066 | 291 | |
7909e65f WD |
292 | if (rl_nulls) { |
293 | for (i = 0; i < sargc; i++) { | |
294 | write_sbuf(f_out, sargs[i]); | |
295 | write_byte(f_out, 0); | |
296 | } | |
297 | write_byte(f_out, 0); | |
298 | } else { | |
299 | for (i = 0; i < sargc; i++) | |
300 | io_printf(f_out, "%s\n", sargs[i]); | |
301 | write_sbuf(f_out, "\n"); | |
3591c066 | 302 | } |
3591c066 | 303 | |
daa598df | 304 | if (protocol_version < 23) { |
3f55bd5d | 305 | if (protocol_version == 22 || !am_sender) |
da3478b2 | 306 | io_start_multiplex_in(); |
09b7f5db | 307 | } |
8d9dc9f9 | 308 | |
68f40ebb | 309 | return 0; |
3591c066 AT |
310 | } |
311 | ||
141c6265 WD |
312 | static char *finish_pre_exec(pid_t pid, int fd, char *request, |
313 | int argc, char *argv[]) | |
c95ca2a2 | 314 | { |
141c6265 | 315 | int j, status = -1; |
3591c066 | 316 | |
7909e65f WD |
317 | if (!request) |
318 | request = "(NONE)"; | |
141c6265 | 319 | |
7909e65f WD |
320 | write_buf(fd, request, strlen(request)+1); |
321 | for (j = 0; j < argc; j++) | |
322 | write_buf(fd, argv[j], strlen(argv[j])+1); | |
141c6265 WD |
323 | write_byte(fd, 0); |
324 | ||
c95ca2a2 WD |
325 | close(fd); |
326 | ||
327 | if (wait_process(pid, &status, 0) < 0 | |
328 | || !WIFEXITED(status) || WEXITSTATUS(status) != 0) { | |
329 | char *e; | |
d0236360 WD |
330 | if (asprintf(&e, "pre-xfer exec returned failure (%d)%s%s\n", |
331 | status, status < 0 ? ": " : "", | |
332 | status < 0 ? strerror(errno) : "") < 0) | |
c95ca2a2 WD |
333 | out_of_memory("finish_pre_exec"); |
334 | return e; | |
335 | } | |
336 | return NULL; | |
337 | } | |
3591c066 | 338 | |
141c6265 WD |
339 | static int read_arg_from_pipe(int fd, char *buf, int limit) |
340 | { | |
341 | char *bp = buf, *eob = buf + limit - 1; | |
342 | ||
343 | while (1) { | |
344 | if (read(fd, bp, 1) != 1) | |
345 | return -1; | |
346 | if (*bp == '\0') | |
347 | break; | |
348 | if (bp < eob) | |
349 | bp++; | |
350 | } | |
351 | *bp = '\0'; | |
352 | ||
353 | return bp - buf; | |
354 | } | |
355 | ||
439a198d | 356 | static int rsync_module(int f_in, int f_out, int i, char *addr, char *host) |
3591c066 | 357 | { |
7909e65f | 358 | int argc, opt_cnt; |
b7061c82 | 359 | char **argv; |
20accf4d | 360 | char line[BIGPATHBUFLEN]; |
2af27ad9 | 361 | uid_t uid = (uid_t)-2; /* canonically "nobody" */ |
1a016bfd | 362 | gid_t gid = (gid_t)-2; |
c95ca2a2 | 363 | char *p, *err_msg = NULL; |
874895d5 | 364 | char *name = lp_name(i); |
8638dd48 | 365 | int use_chroot = lp_use_chroot(i); |
c95ca2a2 WD |
366 | int ret, pre_exec_fd = -1; |
367 | pid_t pre_exec_pid = 0; | |
2e94e70e | 368 | char *request = NULL; |
56c473b7 AT |
369 | |
370 | if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) { | |
1732b6c0 | 371 | rprintf(FLOG, "rsync denied on module %s from %s (%s)\n", |
31ec50d7 | 372 | name, host, addr); |
c0422cea WD |
373 | if (!lp_list(i)) |
374 | io_printf(f_out, "@ERROR: Unknown module '%s'\n", name); | |
375 | else { | |
376 | io_printf(f_out, | |
377 | "@ERROR: access denied to %s from %s (%s)\n", | |
378 | name, host, addr); | |
379 | } | |
56c473b7 AT |
380 | return -1; |
381 | } | |
3591c066 | 382 | |
68f40ebb | 383 | if (am_daemon && am_server) { |
9e5a5ddb | 384 | rprintf(FLOG, "rsync allowed access on module %s from %s (%s)\n", |
68f40ebb WD |
385 | name, host, addr); |
386 | } | |
387 | ||
5e71c444 | 388 | if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) { |
8d72ef6e | 389 | if (errno) { |
1732b6c0 | 390 | rsyserr(FLOG, errno, "failed to open lock file %s", |
45c49b52 | 391 | lp_lock_file(i)); |
4875d6b6 | 392 | io_printf(f_out, "@ERROR: failed to open lock file\n"); |
8d72ef6e | 393 | } else { |
1732b6c0 | 394 | rprintf(FLOG, "max connections (%d) reached\n", |
5e71c444 | 395 | lp_max_connections(i)); |
4ccfd96c | 396 | io_printf(f_out, "@ERROR: max connections (%d) reached -- try again later\n", |
837cbad9 | 397 | lp_max_connections(i)); |
8d72ef6e | 398 | } |
0c515f17 AT |
399 | return -1; |
400 | } | |
401 | ||
45c5b903 | 402 | auth_user = auth_server(f_in, f_out, i, host, addr, "@RSYNCD: AUTHREQD "); |
d0d56395 | 403 | |
97cb8dc2 | 404 | if (!auth_user) { |
68f40ebb | 405 | io_printf(f_out, "@ERROR: auth failed on module %s\n", name); |
4a7144ee | 406 | return -1; |
d0d56395 AT |
407 | } |
408 | ||
3591c066 AT |
409 | module_id = i; |
410 | ||
211bc43b | 411 | if (lp_read_only(i)) |
18638730 WD |
412 | read_only = 1; |
413 | ||
10ae3406 | 414 | if (lp_transfer_logging(i) && !logfile_format) |
ecc7623e | 415 | logfile_format = lp_log_format(i); |
10ae3406 WD |
416 | if (log_format_has(logfile_format, 'i')) |
417 | logfile_format_has_i = 1; | |
418 | if (logfile_format_has_i || log_format_has(logfile_format, 'o')) | |
419 | logfile_format_has_o_or_i = 1; | |
c0814b81 | 420 | |
6fe05820 | 421 | am_root = (MY_UID() == 0); |
8ef4ffd6 | 422 | |
716baed7 DD |
423 | if (am_root) { |
424 | p = lp_uid(i); | |
425 | if (!name_to_uid(p, &uid)) { | |
2dc7b8bd | 426 | if (!isDigit(p)) { |
1732b6c0 | 427 | rprintf(FLOG, "Invalid uid %s\n", p); |
68f40ebb | 428 | io_printf(f_out, "@ERROR: invalid uid %s\n", p); |
716baed7 | 429 | return -1; |
4a7144ee | 430 | } |
716baed7 DD |
431 | uid = atoi(p); |
432 | } | |
433 | ||
434 | p = lp_gid(i); | |
435 | if (!name_to_gid(p, &gid)) { | |
2dc7b8bd | 436 | if (!isDigit(p)) { |
1732b6c0 | 437 | rprintf(FLOG, "Invalid gid %s\n", p); |
68f40ebb | 438 | io_printf(f_out, "@ERROR: invalid gid %s\n", p); |
716baed7 | 439 | return -1; |
4a7144ee | 440 | } |
716baed7 DD |
441 | gid = atoi(p); |
442 | } | |
8ef4ffd6 | 443 | } |
3b2b5345 | 444 | |
4a7144ee WD |
445 | /* TODO: If we're not root, but the configuration requests |
446 | * that we change to some uid other than the current one, then | |
447 | * log a warning. */ | |
448 | ||
449 | /* TODO: Perhaps take a list of gids, and make them into the | |
450 | * supplementary groups. */ | |
8ef4ffd6 | 451 | |
33cbd577 WD |
452 | /* We do a push_dir() without actually calling chdir() in order |
453 | * to make sure that the module's path is absolute. After this | |
454 | * check, module_dir will be set to an absolute path. */ | |
455 | module_dir = lp_path(i); | |
456 | strlcpy(line, curr_dir, sizeof line); | |
457 | if (!push_dir(module_dir, 1)) | |
458 | goto chdir_failed; | |
459 | if (strcmp(curr_dir, module_dir) != 0) | |
460 | module_dir = strdup(curr_dir); | |
461 | push_dir(line, 1); /* Restore curr_dir. */ | |
462 | ||
463 | if (use_chroot || (module_dirlen = strlen(module_dir)) == 1) { | |
e7bf7c01 | 464 | module_dirlen = 0; |
7842418b | 465 | set_filter_dir("/", 1); |
46bffd98 | 466 | } else |
33cbd577 | 467 | set_filter_dir(module_dir, module_dirlen); |
e7bf7c01 WD |
468 | |
469 | p = lp_filter(i); | |
ebfd1a1c | 470 | parse_rule(&server_filter_list, p, MATCHFLG_WORD_SPLIT, |
2c8c8bba | 471 | XFLG_ABS_IF_SLASH); |
837cbad9 | 472 | |
cd64343a | 473 | p = lp_include_from(i); |
ebfd1a1c | 474 | parse_filter_file(&server_filter_list, p, MATCHFLG_INCLUDE, |
2c8c8bba | 475 | XFLG_ABS_IF_SLASH | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS); |
cd64343a DD |
476 | |
477 | p = lp_include(i); | |
ebfd1a1c | 478 | parse_rule(&server_filter_list, p, |
0a68f869 | 479 | MATCHFLG_INCLUDE | MATCHFLG_WORD_SPLIT, |
2c8c8bba | 480 | XFLG_ABS_IF_SLASH | XFLG_OLD_PREFIXES); |
cd64343a | 481 | |
8f3a2d54 | 482 | p = lp_exclude_from(i); |
ebfd1a1c | 483 | parse_filter_file(&server_filter_list, p, 0, |
2c8c8bba | 484 | XFLG_ABS_IF_SLASH | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS); |
8f3a2d54 | 485 | |
5805327b | 486 | p = lp_exclude(i); |
ebfd1a1c | 487 | parse_rule(&server_filter_list, p, MATCHFLG_WORD_SPLIT, |
2c8c8bba | 488 | XFLG_ABS_IF_SLASH | XFLG_OLD_PREFIXES); |
8f3a2d54 | 489 | |
6dc9b74b | 490 | log_init(1); |
1a016bfd | 491 | |
9d0d18b5 | 492 | #ifdef HAVE_PUTENV |
c95ca2a2 | 493 | if (*lp_prexfer_exec(i) || *lp_postxfer_exec(i)) { |
9d0d18b5 WD |
494 | char *modname, *modpath, *hostaddr, *hostname, *username; |
495 | int status; | |
496 | if (asprintf(&modname, "RSYNC_MODULE_NAME=%s", name) < 0 | |
33cbd577 | 497 | || asprintf(&modpath, "RSYNC_MODULE_PATH=%s", module_dir) < 0 |
9d0d18b5 WD |
498 | || asprintf(&hostaddr, "RSYNC_HOST_ADDR=%s", addr) < 0 |
499 | || asprintf(&hostname, "RSYNC_HOST_NAME=%s", host) < 0 | |
500 | || asprintf(&username, "RSYNC_USER_NAME=%s", auth_user) < 0) | |
501 | out_of_memory("rsync_module"); | |
502 | putenv(modname); | |
503 | putenv(modpath); | |
504 | putenv(hostaddr); | |
505 | putenv(hostname); | |
506 | putenv(username); | |
507 | umask(orig_umask); | |
c95ca2a2 WD |
508 | /* For post-xfer exec, fork a new process to run the rsync |
509 | * daemon while this process waits for the exit status and | |
510 | * runs the indicated command at that point. */ | |
511 | if (*lp_postxfer_exec(i)) { | |
9d0d18b5 WD |
512 | pid_t pid = fork(); |
513 | if (pid < 0) { | |
514 | rsyserr(FLOG, errno, "fork failed"); | |
515 | io_printf(f_out, "@ERROR: fork failed\n"); | |
516 | return -1; | |
517 | } | |
518 | if (pid) { | |
503114a7 WD |
519 | if (asprintf(&p, "RSYNC_PID=%ld", (long)pid) > 0) |
520 | putenv(p); | |
c95ca2a2 WD |
521 | if (wait_process(pid, &status, 0) < 0) |
522 | status = -1; | |
503114a7 WD |
523 | if (asprintf(&p, "RSYNC_RAW_STATUS=%d", status) > 0) |
524 | putenv(p); | |
9d0d18b5 WD |
525 | if (WIFEXITED(status)) |
526 | status = WEXITSTATUS(status); | |
527 | else | |
528 | status = -1; | |
503114a7 WD |
529 | if (asprintf(&p, "RSYNC_EXIT_STATUS=%d", status) > 0) |
530 | putenv(p); | |
c95ca2a2 | 531 | system(lp_postxfer_exec(i)); |
9d0d18b5 WD |
532 | _exit(status); |
533 | } | |
534 | } | |
c95ca2a2 WD |
535 | /* For pre-xfer exec, fork a child process to run the indicated |
536 | * command, though it first waits for the parent process to | |
537 | * send us the user's request via a pipe. */ | |
538 | if (*lp_prexfer_exec(i)) { | |
539 | int fds[2]; | |
503114a7 WD |
540 | if (asprintf(&p, "RSYNC_PID=%ld", (long)getpid()) > 0) |
541 | putenv(p); | |
c95ca2a2 WD |
542 | if (pipe(fds) < 0 || (pre_exec_pid = fork()) < 0) { |
543 | rsyserr(FLOG, errno, "pre-xfer exec preparation failed"); | |
544 | io_printf(f_out, "@ERROR: pre-xfer exec preparation failed\n"); | |
545 | return -1; | |
546 | } | |
547 | if (pre_exec_pid == 0) { | |
141c6265 WD |
548 | char buf[BIGPATHBUFLEN]; |
549 | int j, len; | |
c95ca2a2 WD |
550 | close(fds[1]); |
551 | set_blocking(fds[0]); | |
141c6265 | 552 | len = read_arg_from_pipe(fds[0], buf, BIGPATHBUFLEN); |
c95ca2a2 WD |
553 | if (len <= 0) |
554 | _exit(1); | |
503114a7 WD |
555 | if (asprintf(&p, "RSYNC_REQUEST=%s", buf) > 0) |
556 | putenv(p); | |
141c6265 WD |
557 | for (j = 0; ; j++) { |
558 | len = read_arg_from_pipe(fds[0], buf, | |
559 | BIGPATHBUFLEN); | |
560 | if (len <= 0) { | |
561 | if (!len) | |
562 | break; | |
563 | _exit(1); | |
564 | } | |
503114a7 WD |
565 | if (asprintf(&p, "RSYNC_ARG%d=%s", j, buf) > 0) |
566 | putenv(p); | |
141c6265 WD |
567 | } |
568 | close(fds[0]); | |
c95ca2a2 WD |
569 | close(STDIN_FILENO); |
570 | close(STDOUT_FILENO); | |
571 | status = system(lp_prexfer_exec(i)); | |
572 | if (!WIFEXITED(status)) | |
573 | _exit(1); | |
574 | _exit(WEXITSTATUS(status)); | |
575 | } | |
576 | close(fds[0]); | |
577 | set_blocking(fds[1]); | |
578 | pre_exec_fd = fds[1]; | |
579 | } | |
9d0d18b5 WD |
580 | umask(0); |
581 | } | |
582 | #endif | |
583 | ||
8638dd48 | 584 | if (use_chroot) { |
b52c1d9d MP |
585 | /* |
586 | * XXX: The 'use chroot' flag is a fairly reliable | |
587 | * source of confusion, because it fails under two | |
588 | * important circumstances: running as non-root, | |
589 | * running on Win32 (or possibly others). On the | |
590 | * other hand, if you are running as root, then it | |
591 | * might be better to always use chroot. | |
592 | * | |
593 | * So, perhaps if we can't chroot we should just issue | |
594 | * a warning, unless a "require chroot" flag is set, | |
595 | * in which case we fail. | |
596 | */ | |
33cbd577 WD |
597 | if (chroot(module_dir)) { |
598 | rsyserr(FLOG, errno, "chroot %s failed", module_dir); | |
68f40ebb | 599 | io_printf(f_out, "@ERROR: chroot failed\n"); |
8638dd48 DD |
600 | return -1; |
601 | } | |
33cbd577 WD |
602 | if (!push_dir("/", 0)) |
603 | goto chdir_failed; | |
716baed7 | 604 | } else { |
33cbd577 WD |
605 | if (!push_dir(module_dir, 0)) { |
606 | chdir_failed: | |
607 | rsyserr(FLOG, errno, "chdir %s failed\n", module_dir); | |
68f40ebb | 608 | io_printf(f_out, "@ERROR: chdir failed\n"); |
716baed7 DD |
609 | return -1; |
610 | } | |
cb13abfe | 611 | sanitize_paths = 1; |
716baed7 DD |
612 | } |
613 | ||
614 | if (am_root) { | |
715d1f45 MP |
615 | /* XXXX: You could argue that if the daemon is started |
616 | * by a non-root user and they explicitly specify a | |
617 | * gid, then we should try to change to that gid -- | |
618 | * this could be possible if it's already in their | |
619 | * supplementary groups. */ | |
620 | ||
621 | /* TODO: Perhaps we need to document that if rsyncd is | |
622 | * started by somebody other than root it will inherit | |
623 | * all their supplementary groups. */ | |
624 | ||
716baed7 | 625 | if (setgid(gid)) { |
1732b6c0 | 626 | rsyserr(FLOG, errno, "setgid %d failed", (int)gid); |
68f40ebb | 627 | io_printf(f_out, "@ERROR: setgid failed\n"); |
8638dd48 DD |
628 | return -1; |
629 | } | |
4f5b0756 | 630 | #ifdef HAVE_SETGROUPS |
6969ebcf WD |
631 | /* Get rid of any supplementary groups this process |
632 | * might have inheristed. */ | |
633 | if (setgroups(1, &gid)) { | |
1732b6c0 | 634 | rsyserr(FLOG, errno, "setgroups failed"); |
6969ebcf WD |
635 | io_printf(f_out, "@ERROR: setgroups failed\n"); |
636 | return -1; | |
637 | } | |
638 | #endif | |
3591c066 | 639 | |
716baed7 | 640 | if (setuid(uid)) { |
1732b6c0 | 641 | rsyserr(FLOG, errno, "setuid %d failed", (int)uid); |
68f40ebb | 642 | io_printf(f_out, "@ERROR: setuid failed\n"); |
8638dd48 DD |
643 | return -1; |
644 | } | |
645 | ||
6fe05820 | 646 | am_root = (MY_UID() == 0); |
3591c066 AT |
647 | } |
648 | ||
fed1f3f4 WD |
649 | if (lp_temp_dir(i) && *lp_temp_dir(i)) { |
650 | tmpdir = lp_temp_dir(i); | |
651 | if (strlen(tmpdir) >= MAXPATHLEN - 10) { | |
652 | rprintf(FLOG, | |
653 | "the 'temp dir' value for %s is WAY too long -- ignoring.\n", | |
654 | name); | |
655 | tmpdir = NULL; | |
656 | } | |
657 | } | |
658 | ||
68f40ebb | 659 | io_printf(f_out, "@RSYNCD: OK\n"); |
3591c066 | 660 | |
7909e65f | 661 | opt_cnt = read_args(f_in, name, line, sizeof line, rl_nulls, &argv, &argc, &request); |
3591c066 | 662 | |
141c6265 WD |
663 | if (pre_exec_pid) { |
664 | err_msg = finish_pre_exec(pre_exec_pid, pre_exec_fd, request, | |
7909e65f | 665 | opt_cnt, argv); |
141c6265 | 666 | } |
c95ca2a2 | 667 | |
18638730 | 668 | verbose = 0; /* future verbosity is controlled by client options */ |
c9dc1300 | 669 | ret = parse_arguments(&argc, (const char ***) &argv, 0); |
875a13b4 | 670 | am_server = 1; /* Don't let someone try to be tricky. */ |
3162ea6f WD |
671 | if (lp_ignore_errors(module_id)) |
672 | ignore_errors = 1; | |
3591c066 | 673 | |
9439c0cb WD |
674 | if (lp_fake_super(i)) |
675 | am_root = -1; | |
676 | else if (am_root < 0) /* Treat --fake-super from client as --super. */ | |
677 | am_root = 2; | |
678 | ||
7c2a9e76 WD |
679 | if (filesfrom_fd == 0) |
680 | filesfrom_fd = f_in; | |
681 | ||
7b372642 | 682 | if (request) { |
97cb8dc2 | 683 | if (*auth_user) { |
9e5a5ddb WD |
684 | rprintf(FLOG, "rsync %s %s from %s@%s (%s)\n", |
685 | am_sender ? "on" : "to", | |
97cb8dc2 | 686 | request, auth_user, host, addr); |
d0d56395 | 687 | } else { |
9e5a5ddb WD |
688 | rprintf(FLOG, "rsync %s %s from %s (%s)\n", |
689 | am_sender ? "on" : "to", | |
d0d56395 AT |
690 | request, host, addr); |
691 | } | |
7b372642 AT |
692 | free(request); |
693 | } | |
694 | ||
15b7b73d | 695 | #ifndef DEBUG |
3591c066 | 696 | /* don't allow the logs to be flooded too fast */ |
59b0e7a8 WD |
697 | if (verbose > lp_max_verbosity(i)) |
698 | verbose = lp_max_verbosity(i); | |
0199b05f | 699 | #endif |
3591c066 | 700 | |
1732b6c0 WD |
701 | if (protocol_version < 23 |
702 | && (protocol_version == 22 || am_sender)) | |
da3478b2 | 703 | io_start_multiplex_out(); |
c95ca2a2 | 704 | else if (!ret || err_msg) { |
1732b6c0 WD |
705 | /* We have to get I/O multiplexing started so that we can |
706 | * get the error back to the client. This means getting | |
707 | * the protocol setup finished first in later versions. */ | |
708 | setup_protocol(f_out, f_in); | |
b03c719f WD |
709 | if (!am_sender) { |
710 | /* Since we failed in our option parsing, we may not | |
711 | * have finished parsing that the client sent us a | |
712 | * --files-from option, so look for it manually. | |
713 | * Without this, the socket would be in the wrong | |
714 | * state for the upcoming error message. */ | |
715 | if (!files_from) { | |
716 | int i; | |
717 | for (i = 0; i < argc; i++) { | |
718 | if (strncmp(argv[i], "--files-from", 12) == 0) { | |
719 | files_from = ""; | |
720 | break; | |
721 | } | |
722 | } | |
723 | } | |
724 | if (files_from) | |
725 | write_byte(f_out, 0); | |
726 | } | |
da3478b2 | 727 | io_start_multiplex_out(); |
554e0a8d | 728 | } |
15b7b73d | 729 | |
c95ca2a2 WD |
730 | if (!ret || err_msg) { |
731 | if (err_msg) | |
332cf6df | 732 | rwrite(FERROR, err_msg, strlen(err_msg), 0); |
c95ca2a2 WD |
733 | else |
734 | option_error(); | |
7e561438 | 735 | msleep(400); |
4a7144ee | 736 | exit_cleanup(RERR_UNSUPPORTED); |
41979ff8 AT |
737 | } |
738 | ||
3e6ddb37 WD |
739 | if (lp_timeout(i) && lp_timeout(i) > io_timeout) |
740 | set_io_timeout(lp_timeout(i)); | |
81791cfc | 741 | |
f041b025 WD |
742 | /* If we have some incoming/outgoing chmod changes, append them to |
743 | * any user-specified changes (making our changes have priority). | |
744 | * We also get a pointer to just our changes so that a receiver | |
745 | * process can use them separately if --perms wasn't specified. */ | |
aaccaa88 WD |
746 | if (am_sender) |
747 | p = lp_outgoing_chmod(i); | |
748 | else | |
749 | p = lp_incoming_chmod(i); | |
8840ec0f | 750 | if (*p && !(daemon_chmod_modes = parse_chmod(p, &chmod_modes))) { |
aaccaa88 WD |
751 | rprintf(FLOG, "Invalid \"%sing chmod\" directive: %s\n", |
752 | am_sender ? "outgo" : "incom", p); | |
753 | } | |
730df9d2 | 754 | |
c9dc1300 | 755 | start_server(f_in, f_out, argc, argv); |
3591c066 AT |
756 | |
757 | return 0; | |
758 | } | |
759 | ||
7a6421fa AT |
760 | /* send a list of available modules to the client. Don't list those |
761 | with "list = False". */ | |
3591c066 AT |
762 | static void send_listing(int fd) |
763 | { | |
764 | int n = lp_numservices(); | |
765 | int i; | |
063393d6 | 766 | |
c0422cea | 767 | for (i = 0; i < n; i++) { |
3591c066 | 768 | if (lp_list(i)) |
4a7144ee | 769 | io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i)); |
c0422cea | 770 | } |
8f04bb36 | 771 | |
daa598df | 772 | if (protocol_version >= 25) |
063393d6 | 773 | io_printf(fd,"@RSYNCD: EXIT\n"); |
3591c066 AT |
774 | } |
775 | ||
68f40ebb | 776 | /* this is called when a connection is established to a client |
3591c066 AT |
777 | and we want to start talking. The setup of the system is done from |
778 | here */ | |
68f40ebb | 779 | int start_daemon(int f_in, int f_out) |
3591c066 | 780 | { |
20accf4d | 781 | char line[1024]; |
7909e65f | 782 | char *addr, *host; |
c0422cea | 783 | int i; |
4cdf25e4 | 784 | |
da3478b2 WD |
785 | io_set_sock_fds(f_in, f_out); |
786 | ||
374c3e12 WD |
787 | /* We must load the config file before calling any function that |
788 | * might cause log-file output to occur. This ensures that the | |
789 | * "log file" param gets honored for the 2 non-forked use-cases | |
08e0a629 | 790 | * (when rsync is run by init and run by a remote shell). */ |
2e94e70e | 791 | if (!lp_load(config_file, 0)) |
65417579 | 792 | exit_cleanup(RERR_SYNTAX); |
3591c066 | 793 | |
374c3e12 WD |
794 | addr = client_addr(f_in); |
795 | host = client_name(f_in); | |
796 | rprintf(FLOG, "connect from %s (%s)\n", host, addr); | |
91d324b4 | 797 | |
68f40ebb WD |
798 | if (!am_server) { |
799 | set_socket_options(f_in, "SO_KEEPALIVE"); | |
34937987 WD |
800 | if (sockopts) |
801 | set_socket_options(f_in, sockopts); | |
802 | else | |
803 | set_socket_options(f_in, lp_socket_options()); | |
68f40ebb WD |
804 | set_nonblocking(f_in); |
805 | } | |
3591c066 | 806 | |
7909e65f | 807 | if (exchange_protocols(f_in, f_out, line, sizeof line, 0) < 0) |
91eee594 | 808 | return -1; |
91eee594 | 809 | |
c0422cea | 810 | line[0] = 0; |
7909e65f | 811 | if (!read_line_old(f_in, line, sizeof line)) |
c0422cea | 812 | return -1; |
3591c066 | 813 | |
c0422cea | 814 | if (!*line || strcmp(line, "#list") == 0) { |
b3e15181 WD |
815 | rprintf(FLOG, "module-list request from %s (%s)\n", |
816 | host, addr); | |
c0422cea WD |
817 | send_listing(f_out); |
818 | return -1; | |
819 | } | |
3591c066 | 820 | |
c0422cea WD |
821 | if (*line == '#') { |
822 | /* it's some sort of command that I don't understand */ | |
823 | io_printf(f_out, "@ERROR: Unknown command '%s'\n", line); | |
824 | return -1; | |
825 | } | |
3591c066 | 826 | |
c0422cea | 827 | if ((i = lp_number(line)) < 0) { |
c0422cea WD |
828 | rprintf(FLOG, "unknown module '%s' tried from %s (%s)\n", |
829 | line, host, addr); | |
830 | io_printf(f_out, "@ERROR: Unknown module '%s'\n", line); | |
831 | return -1; | |
3591c066 AT |
832 | } |
833 | ||
d749eb68 WD |
834 | #ifdef HAVE_SIGACTION |
835 | sigact.sa_flags = SA_NOCLDSTOP; | |
836 | #endif | |
837 | SIGACTION(SIGCHLD, remember_children); | |
838 | ||
439a198d | 839 | return rsync_module(f_in, f_out, i, addr, host); |
3591c066 AT |
840 | } |
841 | ||
3591c066 AT |
842 | int daemon_main(void) |
843 | { | |
8638dd48 | 844 | char *pid_file; |
1a016bfd | 845 | |
3591c066 | 846 | if (is_a_socket(STDIN_FILENO)) { |
41979ff8 AT |
847 | int i; |
848 | ||
849 | /* we are running via inetd - close off stdout and | |
4a7144ee WD |
850 | * stderr so that library functions (and getopt) don't |
851 | * try to use them. Redirect them to /dev/null */ | |
2e94e70e | 852 | for (i = 1; i < 3; i++) { |
4a7144ee | 853 | close(i); |
41979ff8 AT |
854 | open("/dev/null", O_RDWR); |
855 | } | |
3eb38818 | 856 | |
68f40ebb | 857 | return start_daemon(STDIN_FILENO, STDIN_FILENO); |
3591c066 AT |
858 | } |
859 | ||
13e29995 | 860 | if (!no_detach) |
4a7144ee | 861 | become_daemon(); |
3591c066 | 862 | |
2e94e70e | 863 | if (!lp_load(config_file, 1)) |
65417579 | 864 | exit_cleanup(RERR_SYNTAX); |
f9e940ef | 865 | |
0c56b1ad WD |
866 | if (rsync_port == 0 && (rsync_port = lp_rsync_port()) == 0) |
867 | rsync_port = RSYNC_PORT; | |
3dfe6e97 | 868 | if (bind_address == NULL && *lp_bind_address()) |
986aaaaa | 869 | bind_address = lp_bind_address(); |
0c56b1ad | 870 | |
6dc9b74b | 871 | log_init(0); |
f9e940ef | 872 | |
9e5a5ddb | 873 | rprintf(FLOG, "rsyncd version %s starting, listening on port %d\n", |
4a7144ee WD |
874 | RSYNC_VERSION, rsync_port); |
875 | /* TODO: If listening on a particular address, then show that | |
876 | * address too. In fact, why not just do inet_ntop on the | |
877 | * local address??? */ | |
e42c9458 | 878 | |
8638dd48 | 879 | if (((pid_file = lp_pid_file()) != NULL) && (*pid_file != '\0')) { |
ad517ce5 DD |
880 | char pidbuf[16]; |
881 | int fd; | |
05b7bab8 | 882 | pid_t pid = getpid(); |
8638dd48 | 883 | cleanup_set_pid(pid); |
ad517ce5 DD |
884 | if ((fd = do_open(lp_pid_file(), O_WRONLY|O_CREAT|O_TRUNC, |
885 | 0666 & ~orig_umask)) == -1) { | |
4a7144ee | 886 | cleanup_set_pid(0); |
4875d6b6 | 887 | rsyserr(FLOG, errno, "failed to create pid file %s", |
45c49b52 | 888 | pid_file); |
4a7144ee | 889 | exit_cleanup(RERR_FILEIO); |
8638dd48 | 890 | } |
05b7bab8 | 891 | snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid); |
ad517ce5 DD |
892 | write(fd, pidbuf, strlen(pidbuf)); |
893 | close(fd); | |
8638dd48 DD |
894 | } |
895 | ||
8ef4ffd6 AT |
896 | start_accept_loop(rsync_port, start_daemon); |
897 | return -1; | |
3591c066 | 898 | } |