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 | 22 | #include "rsync.h" |
1b42f628 | 23 | #include "ifuncs.h" |
3591c066 | 24 | |
c0814b81 | 25 | extern int verbose; |
5223b786 | 26 | extern int dry_run; |
9ce7fc38 | 27 | extern int output_motd; |
c0814b81 | 28 | extern int list_only; |
6e195fe9 WD |
29 | extern int am_sender; |
30 | extern int am_server; | |
31 | extern int am_daemon; | |
32 | extern int am_root; | |
3591c066 | 33 | extern int rsync_port; |
3162ea6f | 34 | extern int ignore_errors; |
8dad7fc6 | 35 | extern int kluge_around_eof; |
6e195fe9 | 36 | extern int daemon_over_rsh; |
b35d0d8e | 37 | extern int sanitize_paths; |
7c2a9e76 | 38 | extern int filesfrom_fd; |
daa598df WD |
39 | extern int remote_protocol; |
40 | extern int protocol_version; | |
6e195fe9 | 41 | extern int io_timeout; |
6e195fe9 | 42 | extern int no_detach; |
5223b786 | 43 | extern int write_batch; |
6e195fe9 | 44 | extern int default_af_hint; |
ecc7623e WD |
45 | extern int logfile_format_has_i; |
46 | extern int logfile_format_has_o_or_i; | |
c5b7aa15 | 47 | extern mode_t orig_umask; |
6e195fe9 | 48 | extern char *bind_address; |
34937987 | 49 | extern char *sockopts; |
6e195fe9 | 50 | extern char *config_file; |
ecc7623e | 51 | extern char *logfile_format; |
bf4679e8 | 52 | extern char *files_from; |
fed1f3f4 | 53 | extern char *tmpdir; |
730df9d2 WD |
54 | extern struct chmod_mode_struct *chmod_modes; |
55 | extern struct filter_list_struct server_filter_list; | |
33cbd577 | 56 | extern char curr_dir[]; |
6e195fe9 WD |
57 | |
58 | char *auth_user; | |
18638730 | 59 | int read_only = 0; |
211bc43b | 60 | int module_id = -1; |
8840ec0f | 61 | struct chmod_mode_struct *daemon_chmod_modes; |
3591c066 | 62 | |
33cbd577 WD |
63 | /* module_dirlen is the length of the module_dir string when in daemon |
64 | * mode, not chrooted, and the path is not "/"; otherwise 0. */ | |
65 | char *module_dir = NULL; | |
e7bf7c01 WD |
66 | unsigned int module_dirlen = 0; |
67 | ||
7909e65f WD |
68 | static int rl_nulls = 0; |
69 | ||
d749eb68 WD |
70 | #ifdef HAVE_SIGACTION |
71 | static struct sigaction sigact; | |
72 | #endif | |
73 | ||
be2961da | 74 | /** |
bc363ea9 | 75 | * Run a client connected to an rsyncd. The alternative to this |
be2961da MP |
76 | * function for remote-shell connections is do_cmd(). |
77 | * | |
fdf88d75 MP |
78 | * After negotiating which module to use and reading the server's |
79 | * motd, this hands over to client_run(). Telling the server the | |
80 | * module will cause it to chroot/setuid/etc. | |
81 | * | |
82 | * Instead of doing a transfer, the client may at this stage instead | |
83 | * get a listing of remote modules and exit. | |
be2961da MP |
84 | * |
85 | * @return -1 for error in startup, or the result of client_run(). | |
d0829892 | 86 | * Either way, it eventually gets passed to exit_cleanup(). |
be2961da | 87 | **/ |
7909e65f WD |
88 | int start_socket_client(char *host, int remote_argc, char *remote_argv[], |
89 | int argc, char *argv[]) | |
3591c066 | 90 | { |
68f40ebb | 91 | int fd, ret; |
2e94e70e | 92 | char *p, *user = NULL; |
4a7144ee | 93 | |
1732b6c0 WD |
94 | /* This is redundant with code in start_inband_exchange(), but this |
95 | * short-circuits a problem in the client before we open a socket, | |
96 | * and the extra check won't hurt. */ | |
7909e65f | 97 | if (**remote_argv == '/') { |
1732b6c0 WD |
98 | rprintf(FERROR, |
99 | "ERROR: The remote path must start with a module name not a /\n"); | |
f98df1d9 AT |
100 | return -1; |
101 | } | |
102 | ||
b31c92ed | 103 | if ((p = strrchr(host, '@')) != NULL) { |
bcb7e502 AT |
104 | user = host; |
105 | host = p+1; | |
1732b6c0 | 106 | *p = '\0'; |
bcb7e502 AT |
107 | } |
108 | ||
837cbad9 WD |
109 | fd = open_socket_out_wrapped(host, rsync_port, bind_address, |
110 | default_af_hint); | |
df5cd107 | 111 | if (fd == -1) |
65417579 | 112 | exit_cleanup(RERR_SOCKETIO); |
68f40ebb | 113 | |
34937987 WD |
114 | set_socket_options(fd, sockopts); |
115 | ||
7909e65f | 116 | ret = start_inband_exchange(fd, fd, user, remote_argc, remote_argv); |
68f40ebb | 117 | |
180443af | 118 | return ret ? ret : client_run(fd, fd, -1, argc, argv); |
68f40ebb WD |
119 | } |
120 | ||
7909e65f WD |
121 | static int exchange_protocols(int f_in, int f_out, char *buf, size_t bufsiz, int am_client) |
122 | { | |
123 | int remote_sub = -1; | |
124 | #if SUBPROTOCOL_VERSION != 0 | |
125 | int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION; | |
126 | #else | |
127 | int our_sub = 0; | |
128 | #endif | |
129 | char *motd; | |
130 | ||
131 | io_printf(f_out, "@RSYNCD: %d.%d\n", protocol_version, our_sub); | |
132 | ||
133 | if (!am_client) { | |
134 | motd = lp_motd_file(); | |
135 | if (motd && *motd) { | |
136 | FILE *f = fopen(motd,"r"); | |
137 | while (f && !feof(f)) { | |
138 | int len = fread(buf, 1, bufsiz - 1, f); | |
139 | if (len > 0) | |
140 | write_buf(f_out, buf, len); | |
141 | } | |
142 | if (f) | |
143 | fclose(f); | |
144 | write_sbuf(f_out, "\n"); | |
145 | } | |
146 | } | |
147 | ||
148 | /* This strips the \n. */ | |
149 | if (!read_line_old(f_in, buf, bufsiz)) { | |
150 | if (am_client) | |
151 | rprintf(FERROR, "rsync: did not see server greeting\n"); | |
152 | return -1; | |
153 | } | |
154 | ||
155 | if (sscanf(buf, "@RSYNCD: %d.%d", &remote_protocol, &remote_sub) < 1) { | |
156 | if (am_client) | |
157 | rprintf(FERROR, "rsync: server sent \"%s\" rather than greeting\n", buf); | |
158 | else | |
159 | io_printf(f_out, "@ERROR: protocol startup error\n"); | |
160 | return -1; | |
161 | } | |
162 | ||
163 | if (remote_sub < 0) { | |
164 | if (remote_protocol == 30) { | |
165 | if (am_client) | |
166 | rprintf(FERROR, "rsync: server is speaking an incompatible beta of protocol 30\n"); | |
167 | else | |
168 | io_printf(f_out, "@ERROR: your client is speaking an incompatible beta of protocol 30\n"); | |
169 | return -1; | |
170 | } | |
171 | remote_sub = 0; | |
172 | } | |
173 | ||
174 | if (protocol_version > remote_protocol) { | |
175 | protocol_version = remote_protocol; | |
176 | if (remote_sub) | |
177 | protocol_version--; | |
178 | } else if (protocol_version == remote_protocol) { | |
179 | if (remote_sub != our_sub) | |
180 | protocol_version--; | |
181 | } | |
182 | #if SUBPROTOCOL_VERSION != 0 | |
183 | else if (protocol_version < remote_protocol) { | |
184 | if (our_sub) | |
185 | protocol_version--; | |
186 | } | |
187 | #endif | |
188 | ||
189 | if (protocol_version >= 30) | |
190 | rl_nulls = 1; | |
191 | ||
192 | return 0; | |
193 | } | |
194 | ||
195 | int start_inband_exchange(int f_in, int f_out, const char *user, int argc, char *argv[]) | |
68f40ebb | 196 | { |
e844a4a8 | 197 | int i, modlen; |
7909e65f | 198 | char line[BIGPATHBUFLEN]; |
68f40ebb WD |
199 | char *sargs[MAX_ARGS]; |
200 | int sargc = 0; | |
e844a4a8 | 201 | char *p, *modname; |
68f40ebb | 202 | |
e844a4a8 | 203 | assert(argc > 0); |
68f40ebb | 204 | |
e844a4a8 | 205 | if (**argv == '/') { |
1732b6c0 WD |
206 | rprintf(FERROR, |
207 | "ERROR: The remote path must start with a module name\n"); | |
68f40ebb WD |
208 | return -1; |
209 | } | |
210 | ||
e844a4a8 WD |
211 | if (!(p = strchr(*argv, '/'))) |
212 | modlen = strlen(*argv); | |
213 | else | |
214 | modlen = p - *argv; | |
215 | ||
216 | if (!(modname = new_array(char, modlen+1+1))) /* room for '/' & '\0' */ | |
217 | out_of_memory("start_inband_exchange"); | |
218 | strlcpy(modname, *argv, modlen + 1); | |
219 | modname[modlen] = '/'; | |
220 | modname[modlen+1] = '\0'; | |
221 | ||
2e94e70e WD |
222 | if (!user) |
223 | user = getenv("USER"); | |
224 | if (!user) | |
225 | user = getenv("LOGNAME"); | |
68f40ebb | 226 | |
7909e65f | 227 | if (exchange_protocols(f_in, f_out, line, sizeof line, 1) < 0) |
3591c066 | 228 | return -1; |
3591c066 | 229 | |
9bcb2595 WD |
230 | /* set daemon_over_rsh to false since we need to build the |
231 | * true set of args passed through the rsh/ssh connection; | |
232 | * this is a no-op for direct-socket-connection mode */ | |
233 | daemon_over_rsh = 0; | |
234 | server_options(sargs, &sargc); | |
235 | ||
7909e65f WD |
236 | if (sargc >= MAX_ARGS - 2) |
237 | goto arg_overflow; | |
238 | ||
9bcb2595 WD |
239 | sargs[sargc++] = "."; |
240 | ||
7909e65f WD |
241 | while (argc > 0) { |
242 | if (sargc >= MAX_ARGS - 1) { | |
243 | arg_overflow: | |
244 | rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n"); | |
245 | exit_cleanup(RERR_SYNTAX); | |
246 | } | |
e844a4a8 WD |
247 | if (list_only && strncmp(*argv, modname, modlen) == 0 |
248 | && argv[0][modlen] == '\0') | |
249 | sargs[sargc++] = modname; /* we send "modname/" */ | |
250 | else | |
251 | sargs[sargc++] = *argv; | |
252 | argv++; | |
7909e65f WD |
253 | argc--; |
254 | } | |
9bcb2595 WD |
255 | |
256 | sargs[sargc] = NULL; | |
257 | ||
258 | if (verbose > 1) | |
0b515981 | 259 | print_child_argv("sending daemon args:", sargs); |
9bcb2595 | 260 | |
e844a4a8 | 261 | io_printf(f_out, "%.*s\n", modlen, modname); |
2c91d3d3 | 262 | |
063393d6 MP |
263 | /* Old servers may just drop the connection here, |
264 | rather than sending a proper EXIT command. Yuck. */ | |
8dad7fc6 | 265 | kluge_around_eof = list_only && protocol_version < 25 ? 1 : 0; |
7a55d06e | 266 | |
063393d6 | 267 | while (1) { |
7909e65f | 268 | if (!read_line_old(f_in, line, sizeof line)) { |
be2961da | 269 | rprintf(FERROR, "rsync: didn't get server startup line\n"); |
3591c066 AT |
270 | return -1; |
271 | } | |
31593dd6 | 272 | |
31593dd6 | 273 | if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) { |
68f40ebb | 274 | auth_client(f_out, user, line+18); |
31593dd6 AT |
275 | continue; |
276 | } | |
31593dd6 | 277 | |
2e94e70e WD |
278 | if (strcmp(line,"@RSYNCD: OK") == 0) |
279 | break; | |
8f04bb36 | 280 | |
cae95647 MP |
281 | if (strcmp(line,"@RSYNCD: EXIT") == 0) { |
282 | /* This is sent by recent versions of the | |
283 | * server to terminate the listing of modules. | |
284 | * We don't want to go on and transfer | |
285 | * anything; just exit. */ | |
286 | exit(0); | |
287 | } | |
8f04bb36 | 288 | |
136ac7ec | 289 | if (strncmp(line, "@ERROR", 6) == 0) { |
1732b6c0 | 290 | rprintf(FERROR, "%s\n", line); |
136ac7ec MP |
291 | /* This is always fatal; the server will now |
292 | * close the socket. */ | |
180443af | 293 | return -1; |
136ac7ec | 294 | } |
180443af | 295 | |
9ce7fc38 WD |
296 | /* This might be a MOTD line or a module listing, but there is |
297 | * no way to differentiate it. The manpage mentions this. */ | |
298 | if (output_motd) | |
299 | rprintf(FINFO, "%s\n", line); | |
3591c066 | 300 | } |
8dad7fc6 | 301 | kluge_around_eof = 0; |
3591c066 | 302 | |
7909e65f WD |
303 | if (rl_nulls) { |
304 | for (i = 0; i < sargc; i++) { | |
305 | write_sbuf(f_out, sargs[i]); | |
306 | write_byte(f_out, 0); | |
307 | } | |
308 | write_byte(f_out, 0); | |
309 | } else { | |
310 | for (i = 0; i < sargc; i++) | |
311 | io_printf(f_out, "%s\n", sargs[i]); | |
312 | write_sbuf(f_out, "\n"); | |
3591c066 | 313 | } |
3591c066 | 314 | |
daa598df | 315 | if (protocol_version < 23) { |
3f55bd5d | 316 | if (protocol_version == 22 || !am_sender) |
da3478b2 | 317 | io_start_multiplex_in(); |
09b7f5db | 318 | } |
8d9dc9f9 | 319 | |
e844a4a8 WD |
320 | free(modname); |
321 | ||
68f40ebb | 322 | return 0; |
3591c066 AT |
323 | } |
324 | ||
141c6265 WD |
325 | static char *finish_pre_exec(pid_t pid, int fd, char *request, |
326 | int argc, char *argv[]) | |
c95ca2a2 | 327 | { |
141c6265 | 328 | int j, status = -1; |
3591c066 | 329 | |
7909e65f WD |
330 | if (!request) |
331 | request = "(NONE)"; | |
141c6265 | 332 | |
7909e65f WD |
333 | write_buf(fd, request, strlen(request)+1); |
334 | for (j = 0; j < argc; j++) | |
335 | write_buf(fd, argv[j], strlen(argv[j])+1); | |
141c6265 WD |
336 | write_byte(fd, 0); |
337 | ||
c95ca2a2 WD |
338 | close(fd); |
339 | ||
340 | if (wait_process(pid, &status, 0) < 0 | |
341 | || !WIFEXITED(status) || WEXITSTATUS(status) != 0) { | |
342 | char *e; | |
d0236360 WD |
343 | if (asprintf(&e, "pre-xfer exec returned failure (%d)%s%s\n", |
344 | status, status < 0 ? ": " : "", | |
345 | status < 0 ? strerror(errno) : "") < 0) | |
c95ca2a2 WD |
346 | out_of_memory("finish_pre_exec"); |
347 | return e; | |
348 | } | |
349 | return NULL; | |
350 | } | |
3591c066 | 351 | |
141c6265 WD |
352 | static int read_arg_from_pipe(int fd, char *buf, int limit) |
353 | { | |
354 | char *bp = buf, *eob = buf + limit - 1; | |
355 | ||
356 | while (1) { | |
357 | if (read(fd, bp, 1) != 1) | |
358 | return -1; | |
359 | if (*bp == '\0') | |
360 | break; | |
361 | if (bp < eob) | |
362 | bp++; | |
363 | } | |
364 | *bp = '\0'; | |
365 | ||
366 | return bp - buf; | |
367 | } | |
368 | ||
439a198d | 369 | static int rsync_module(int f_in, int f_out, int i, char *addr, char *host) |
3591c066 | 370 | { |
7909e65f | 371 | int argc, opt_cnt; |
b7061c82 | 372 | char **argv; |
20accf4d | 373 | char line[BIGPATHBUFLEN]; |
2af27ad9 | 374 | uid_t uid = (uid_t)-2; /* canonically "nobody" */ |
1a016bfd | 375 | gid_t gid = (gid_t)-2; |
c95ca2a2 | 376 | char *p, *err_msg = NULL; |
874895d5 | 377 | char *name = lp_name(i); |
8638dd48 | 378 | int use_chroot = lp_use_chroot(i); |
c95ca2a2 WD |
379 | int ret, pre_exec_fd = -1; |
380 | pid_t pre_exec_pid = 0; | |
2e94e70e | 381 | char *request = NULL; |
56c473b7 AT |
382 | |
383 | if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) { | |
1732b6c0 | 384 | rprintf(FLOG, "rsync denied on module %s from %s (%s)\n", |
31ec50d7 | 385 | name, host, addr); |
c0422cea WD |
386 | if (!lp_list(i)) |
387 | io_printf(f_out, "@ERROR: Unknown module '%s'\n", name); | |
388 | else { | |
389 | io_printf(f_out, | |
390 | "@ERROR: access denied to %s from %s (%s)\n", | |
391 | name, host, addr); | |
392 | } | |
56c473b7 AT |
393 | return -1; |
394 | } | |
3591c066 | 395 | |
68f40ebb | 396 | if (am_daemon && am_server) { |
9e5a5ddb | 397 | rprintf(FLOG, "rsync allowed access on module %s from %s (%s)\n", |
68f40ebb WD |
398 | name, host, addr); |
399 | } | |
400 | ||
5e71c444 | 401 | if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) { |
8d72ef6e | 402 | if (errno) { |
1732b6c0 | 403 | rsyserr(FLOG, errno, "failed to open lock file %s", |
45c49b52 | 404 | lp_lock_file(i)); |
4875d6b6 | 405 | io_printf(f_out, "@ERROR: failed to open lock file\n"); |
8d72ef6e | 406 | } else { |
1732b6c0 | 407 | rprintf(FLOG, "max connections (%d) reached\n", |
5e71c444 | 408 | lp_max_connections(i)); |
4ccfd96c | 409 | io_printf(f_out, "@ERROR: max connections (%d) reached -- try again later\n", |
837cbad9 | 410 | lp_max_connections(i)); |
8d72ef6e | 411 | } |
0c515f17 AT |
412 | return -1; |
413 | } | |
414 | ||
45c5b903 | 415 | auth_user = auth_server(f_in, f_out, i, host, addr, "@RSYNCD: AUTHREQD "); |
d0d56395 | 416 | |
97cb8dc2 | 417 | if (!auth_user) { |
68f40ebb | 418 | io_printf(f_out, "@ERROR: auth failed on module %s\n", name); |
4a7144ee | 419 | return -1; |
d0d56395 AT |
420 | } |
421 | ||
3591c066 AT |
422 | module_id = i; |
423 | ||
211bc43b | 424 | if (lp_read_only(i)) |
18638730 WD |
425 | read_only = 1; |
426 | ||
10ae3406 | 427 | if (lp_transfer_logging(i) && !logfile_format) |
ecc7623e | 428 | logfile_format = lp_log_format(i); |
10ae3406 WD |
429 | if (log_format_has(logfile_format, 'i')) |
430 | logfile_format_has_i = 1; | |
431 | if (logfile_format_has_i || log_format_has(logfile_format, 'o')) | |
432 | logfile_format_has_o_or_i = 1; | |
c0814b81 | 433 | |
6fe05820 | 434 | am_root = (MY_UID() == 0); |
8ef4ffd6 | 435 | |
716baed7 DD |
436 | if (am_root) { |
437 | p = lp_uid(i); | |
438 | if (!name_to_uid(p, &uid)) { | |
2dc7b8bd | 439 | if (!isDigit(p)) { |
1732b6c0 | 440 | rprintf(FLOG, "Invalid uid %s\n", p); |
68f40ebb | 441 | io_printf(f_out, "@ERROR: invalid uid %s\n", p); |
716baed7 | 442 | return -1; |
4a7144ee | 443 | } |
716baed7 DD |
444 | uid = atoi(p); |
445 | } | |
446 | ||
447 | p = lp_gid(i); | |
448 | if (!name_to_gid(p, &gid)) { | |
2dc7b8bd | 449 | if (!isDigit(p)) { |
1732b6c0 | 450 | rprintf(FLOG, "Invalid gid %s\n", p); |
68f40ebb | 451 | io_printf(f_out, "@ERROR: invalid gid %s\n", p); |
716baed7 | 452 | return -1; |
4a7144ee | 453 | } |
716baed7 DD |
454 | gid = atoi(p); |
455 | } | |
8ef4ffd6 | 456 | } |
3b2b5345 | 457 | |
4a7144ee WD |
458 | /* TODO: If we're not root, but the configuration requests |
459 | * that we change to some uid other than the current one, then | |
460 | * log a warning. */ | |
461 | ||
462 | /* TODO: Perhaps take a list of gids, and make them into the | |
463 | * supplementary groups. */ | |
8ef4ffd6 | 464 | |
33cbd577 WD |
465 | /* We do a push_dir() without actually calling chdir() in order |
466 | * to make sure that the module's path is absolute. After this | |
467 | * check, module_dir will be set to an absolute path. */ | |
468 | module_dir = lp_path(i); | |
469 | strlcpy(line, curr_dir, sizeof line); | |
470 | if (!push_dir(module_dir, 1)) | |
471 | goto chdir_failed; | |
472 | if (strcmp(curr_dir, module_dir) != 0) | |
473 | module_dir = strdup(curr_dir); | |
474 | push_dir(line, 1); /* Restore curr_dir. */ | |
475 | ||
476 | if (use_chroot || (module_dirlen = strlen(module_dir)) == 1) { | |
e7bf7c01 | 477 | module_dirlen = 0; |
7842418b | 478 | set_filter_dir("/", 1); |
46bffd98 | 479 | } else |
33cbd577 | 480 | set_filter_dir(module_dir, module_dirlen); |
e7bf7c01 WD |
481 | |
482 | p = lp_filter(i); | |
ebfd1a1c | 483 | parse_rule(&server_filter_list, p, MATCHFLG_WORD_SPLIT, |
2c8c8bba | 484 | XFLG_ABS_IF_SLASH); |
837cbad9 | 485 | |
cd64343a | 486 | p = lp_include_from(i); |
ebfd1a1c | 487 | parse_filter_file(&server_filter_list, p, MATCHFLG_INCLUDE, |
2c8c8bba | 488 | XFLG_ABS_IF_SLASH | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS); |
cd64343a DD |
489 | |
490 | p = lp_include(i); | |
ebfd1a1c | 491 | parse_rule(&server_filter_list, p, |
0a68f869 | 492 | MATCHFLG_INCLUDE | MATCHFLG_WORD_SPLIT, |
2c8c8bba | 493 | XFLG_ABS_IF_SLASH | XFLG_OLD_PREFIXES); |
cd64343a | 494 | |
8f3a2d54 | 495 | p = lp_exclude_from(i); |
ebfd1a1c | 496 | parse_filter_file(&server_filter_list, p, 0, |
2c8c8bba | 497 | XFLG_ABS_IF_SLASH | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS); |
8f3a2d54 | 498 | |
5805327b | 499 | p = lp_exclude(i); |
ebfd1a1c | 500 | parse_rule(&server_filter_list, p, MATCHFLG_WORD_SPLIT, |
2c8c8bba | 501 | XFLG_ABS_IF_SLASH | XFLG_OLD_PREFIXES); |
8f3a2d54 | 502 | |
6dc9b74b | 503 | log_init(1); |
1a016bfd | 504 | |
9d0d18b5 | 505 | #ifdef HAVE_PUTENV |
c95ca2a2 | 506 | if (*lp_prexfer_exec(i) || *lp_postxfer_exec(i)) { |
9d0d18b5 WD |
507 | char *modname, *modpath, *hostaddr, *hostname, *username; |
508 | int status; | |
509 | if (asprintf(&modname, "RSYNC_MODULE_NAME=%s", name) < 0 | |
33cbd577 | 510 | || asprintf(&modpath, "RSYNC_MODULE_PATH=%s", module_dir) < 0 |
9d0d18b5 WD |
511 | || asprintf(&hostaddr, "RSYNC_HOST_ADDR=%s", addr) < 0 |
512 | || asprintf(&hostname, "RSYNC_HOST_NAME=%s", host) < 0 | |
513 | || asprintf(&username, "RSYNC_USER_NAME=%s", auth_user) < 0) | |
514 | out_of_memory("rsync_module"); | |
515 | putenv(modname); | |
516 | putenv(modpath); | |
517 | putenv(hostaddr); | |
518 | putenv(hostname); | |
519 | putenv(username); | |
520 | umask(orig_umask); | |
c95ca2a2 WD |
521 | /* For post-xfer exec, fork a new process to run the rsync |
522 | * daemon while this process waits for the exit status and | |
523 | * runs the indicated command at that point. */ | |
524 | if (*lp_postxfer_exec(i)) { | |
9d0d18b5 WD |
525 | pid_t pid = fork(); |
526 | if (pid < 0) { | |
527 | rsyserr(FLOG, errno, "fork failed"); | |
528 | io_printf(f_out, "@ERROR: fork failed\n"); | |
529 | return -1; | |
530 | } | |
531 | if (pid) { | |
503114a7 WD |
532 | if (asprintf(&p, "RSYNC_PID=%ld", (long)pid) > 0) |
533 | putenv(p); | |
c95ca2a2 WD |
534 | if (wait_process(pid, &status, 0) < 0) |
535 | status = -1; | |
503114a7 WD |
536 | if (asprintf(&p, "RSYNC_RAW_STATUS=%d", status) > 0) |
537 | putenv(p); | |
9d0d18b5 WD |
538 | if (WIFEXITED(status)) |
539 | status = WEXITSTATUS(status); | |
540 | else | |
541 | status = -1; | |
503114a7 WD |
542 | if (asprintf(&p, "RSYNC_EXIT_STATUS=%d", status) > 0) |
543 | putenv(p); | |
c95ca2a2 | 544 | system(lp_postxfer_exec(i)); |
9d0d18b5 WD |
545 | _exit(status); |
546 | } | |
547 | } | |
c95ca2a2 WD |
548 | /* For pre-xfer exec, fork a child process to run the indicated |
549 | * command, though it first waits for the parent process to | |
550 | * send us the user's request via a pipe. */ | |
551 | if (*lp_prexfer_exec(i)) { | |
552 | int fds[2]; | |
503114a7 WD |
553 | if (asprintf(&p, "RSYNC_PID=%ld", (long)getpid()) > 0) |
554 | putenv(p); | |
c95ca2a2 WD |
555 | if (pipe(fds) < 0 || (pre_exec_pid = fork()) < 0) { |
556 | rsyserr(FLOG, errno, "pre-xfer exec preparation failed"); | |
557 | io_printf(f_out, "@ERROR: pre-xfer exec preparation failed\n"); | |
558 | return -1; | |
559 | } | |
560 | if (pre_exec_pid == 0) { | |
141c6265 WD |
561 | char buf[BIGPATHBUFLEN]; |
562 | int j, len; | |
c95ca2a2 WD |
563 | close(fds[1]); |
564 | set_blocking(fds[0]); | |
141c6265 | 565 | len = read_arg_from_pipe(fds[0], buf, BIGPATHBUFLEN); |
c95ca2a2 WD |
566 | if (len <= 0) |
567 | _exit(1); | |
503114a7 WD |
568 | if (asprintf(&p, "RSYNC_REQUEST=%s", buf) > 0) |
569 | putenv(p); | |
141c6265 WD |
570 | for (j = 0; ; j++) { |
571 | len = read_arg_from_pipe(fds[0], buf, | |
572 | BIGPATHBUFLEN); | |
573 | if (len <= 0) { | |
574 | if (!len) | |
575 | break; | |
576 | _exit(1); | |
577 | } | |
503114a7 WD |
578 | if (asprintf(&p, "RSYNC_ARG%d=%s", j, buf) > 0) |
579 | putenv(p); | |
141c6265 WD |
580 | } |
581 | close(fds[0]); | |
c95ca2a2 WD |
582 | close(STDIN_FILENO); |
583 | close(STDOUT_FILENO); | |
584 | status = system(lp_prexfer_exec(i)); | |
585 | if (!WIFEXITED(status)) | |
586 | _exit(1); | |
587 | _exit(WEXITSTATUS(status)); | |
588 | } | |
589 | close(fds[0]); | |
590 | set_blocking(fds[1]); | |
591 | pre_exec_fd = fds[1]; | |
592 | } | |
9d0d18b5 WD |
593 | umask(0); |
594 | } | |
595 | #endif | |
596 | ||
8638dd48 | 597 | if (use_chroot) { |
b52c1d9d MP |
598 | /* |
599 | * XXX: The 'use chroot' flag is a fairly reliable | |
600 | * source of confusion, because it fails under two | |
601 | * important circumstances: running as non-root, | |
602 | * running on Win32 (or possibly others). On the | |
603 | * other hand, if you are running as root, then it | |
604 | * might be better to always use chroot. | |
605 | * | |
606 | * So, perhaps if we can't chroot we should just issue | |
607 | * a warning, unless a "require chroot" flag is set, | |
608 | * in which case we fail. | |
609 | */ | |
33cbd577 WD |
610 | if (chroot(module_dir)) { |
611 | rsyserr(FLOG, errno, "chroot %s failed", module_dir); | |
68f40ebb | 612 | io_printf(f_out, "@ERROR: chroot failed\n"); |
8638dd48 DD |
613 | return -1; |
614 | } | |
33cbd577 WD |
615 | if (!push_dir("/", 0)) |
616 | goto chdir_failed; | |
716baed7 | 617 | } else { |
33cbd577 WD |
618 | if (!push_dir(module_dir, 0)) { |
619 | chdir_failed: | |
620 | rsyserr(FLOG, errno, "chdir %s failed\n", module_dir); | |
68f40ebb | 621 | io_printf(f_out, "@ERROR: chdir failed\n"); |
716baed7 DD |
622 | return -1; |
623 | } | |
cb13abfe | 624 | sanitize_paths = 1; |
716baed7 DD |
625 | } |
626 | ||
627 | if (am_root) { | |
715d1f45 MP |
628 | /* XXXX: You could argue that if the daemon is started |
629 | * by a non-root user and they explicitly specify a | |
630 | * gid, then we should try to change to that gid -- | |
631 | * this could be possible if it's already in their | |
632 | * supplementary groups. */ | |
633 | ||
634 | /* TODO: Perhaps we need to document that if rsyncd is | |
635 | * started by somebody other than root it will inherit | |
636 | * all their supplementary groups. */ | |
637 | ||
716baed7 | 638 | if (setgid(gid)) { |
1732b6c0 | 639 | rsyserr(FLOG, errno, "setgid %d failed", (int)gid); |
68f40ebb | 640 | io_printf(f_out, "@ERROR: setgid failed\n"); |
8638dd48 DD |
641 | return -1; |
642 | } | |
4f5b0756 | 643 | #ifdef HAVE_SETGROUPS |
6969ebcf WD |
644 | /* Get rid of any supplementary groups this process |
645 | * might have inheristed. */ | |
646 | if (setgroups(1, &gid)) { | |
1732b6c0 | 647 | rsyserr(FLOG, errno, "setgroups failed"); |
6969ebcf WD |
648 | io_printf(f_out, "@ERROR: setgroups failed\n"); |
649 | return -1; | |
650 | } | |
651 | #endif | |
3591c066 | 652 | |
716baed7 | 653 | if (setuid(uid)) { |
1732b6c0 | 654 | rsyserr(FLOG, errno, "setuid %d failed", (int)uid); |
68f40ebb | 655 | io_printf(f_out, "@ERROR: setuid failed\n"); |
8638dd48 DD |
656 | return -1; |
657 | } | |
658 | ||
6fe05820 | 659 | am_root = (MY_UID() == 0); |
3591c066 AT |
660 | } |
661 | ||
fed1f3f4 WD |
662 | if (lp_temp_dir(i) && *lp_temp_dir(i)) { |
663 | tmpdir = lp_temp_dir(i); | |
664 | if (strlen(tmpdir) >= MAXPATHLEN - 10) { | |
665 | rprintf(FLOG, | |
666 | "the 'temp dir' value for %s is WAY too long -- ignoring.\n", | |
667 | name); | |
668 | tmpdir = NULL; | |
669 | } | |
670 | } | |
671 | ||
68f40ebb | 672 | io_printf(f_out, "@RSYNCD: OK\n"); |
3591c066 | 673 | |
7909e65f | 674 | opt_cnt = read_args(f_in, name, line, sizeof line, rl_nulls, &argv, &argc, &request); |
3591c066 | 675 | |
141c6265 WD |
676 | if (pre_exec_pid) { |
677 | err_msg = finish_pre_exec(pre_exec_pid, pre_exec_fd, request, | |
7909e65f | 678 | opt_cnt, argv); |
141c6265 | 679 | } |
c95ca2a2 | 680 | |
18638730 | 681 | verbose = 0; /* future verbosity is controlled by client options */ |
c9dc1300 | 682 | ret = parse_arguments(&argc, (const char ***) &argv, 0); |
875a13b4 | 683 | am_server = 1; /* Don't let someone try to be tricky. */ |
3162ea6f WD |
684 | if (lp_ignore_errors(module_id)) |
685 | ignore_errors = 1; | |
5223b786 WD |
686 | if (write_batch < 0) |
687 | dry_run = 1; | |
3591c066 | 688 | |
9439c0cb WD |
689 | if (lp_fake_super(i)) |
690 | am_root = -1; | |
691 | else if (am_root < 0) /* Treat --fake-super from client as --super. */ | |
692 | am_root = 2; | |
693 | ||
7c2a9e76 WD |
694 | if (filesfrom_fd == 0) |
695 | filesfrom_fd = f_in; | |
696 | ||
7b372642 | 697 | if (request) { |
97cb8dc2 | 698 | if (*auth_user) { |
9e5a5ddb WD |
699 | rprintf(FLOG, "rsync %s %s from %s@%s (%s)\n", |
700 | am_sender ? "on" : "to", | |
97cb8dc2 | 701 | request, auth_user, host, addr); |
d0d56395 | 702 | } else { |
9e5a5ddb WD |
703 | rprintf(FLOG, "rsync %s %s from %s (%s)\n", |
704 | am_sender ? "on" : "to", | |
d0d56395 AT |
705 | request, host, addr); |
706 | } | |
7b372642 AT |
707 | free(request); |
708 | } | |
709 | ||
15b7b73d | 710 | #ifndef DEBUG |
3591c066 | 711 | /* don't allow the logs to be flooded too fast */ |
59b0e7a8 WD |
712 | if (verbose > lp_max_verbosity(i)) |
713 | verbose = lp_max_verbosity(i); | |
0199b05f | 714 | #endif |
3591c066 | 715 | |
1732b6c0 WD |
716 | if (protocol_version < 23 |
717 | && (protocol_version == 22 || am_sender)) | |
da3478b2 | 718 | io_start_multiplex_out(); |
c95ca2a2 | 719 | else if (!ret || err_msg) { |
1732b6c0 WD |
720 | /* We have to get I/O multiplexing started so that we can |
721 | * get the error back to the client. This means getting | |
722 | * the protocol setup finished first in later versions. */ | |
723 | setup_protocol(f_out, f_in); | |
b03c719f WD |
724 | if (!am_sender) { |
725 | /* Since we failed in our option parsing, we may not | |
726 | * have finished parsing that the client sent us a | |
727 | * --files-from option, so look for it manually. | |
728 | * Without this, the socket would be in the wrong | |
729 | * state for the upcoming error message. */ | |
730 | if (!files_from) { | |
731 | int i; | |
732 | for (i = 0; i < argc; i++) { | |
733 | if (strncmp(argv[i], "--files-from", 12) == 0) { | |
734 | files_from = ""; | |
735 | break; | |
736 | } | |
737 | } | |
738 | } | |
739 | if (files_from) | |
740 | write_byte(f_out, 0); | |
741 | } | |
da3478b2 | 742 | io_start_multiplex_out(); |
554e0a8d | 743 | } |
15b7b73d | 744 | |
c95ca2a2 WD |
745 | if (!ret || err_msg) { |
746 | if (err_msg) | |
332cf6df | 747 | rwrite(FERROR, err_msg, strlen(err_msg), 0); |
c95ca2a2 WD |
748 | else |
749 | option_error(); | |
7e561438 | 750 | msleep(400); |
4a7144ee | 751 | exit_cleanup(RERR_UNSUPPORTED); |
41979ff8 AT |
752 | } |
753 | ||
3e6ddb37 WD |
754 | if (lp_timeout(i) && lp_timeout(i) > io_timeout) |
755 | set_io_timeout(lp_timeout(i)); | |
81791cfc | 756 | |
f041b025 WD |
757 | /* If we have some incoming/outgoing chmod changes, append them to |
758 | * any user-specified changes (making our changes have priority). | |
759 | * We also get a pointer to just our changes so that a receiver | |
760 | * process can use them separately if --perms wasn't specified. */ | |
aaccaa88 WD |
761 | if (am_sender) |
762 | p = lp_outgoing_chmod(i); | |
763 | else | |
764 | p = lp_incoming_chmod(i); | |
8840ec0f | 765 | if (*p && !(daemon_chmod_modes = parse_chmod(p, &chmod_modes))) { |
aaccaa88 WD |
766 | rprintf(FLOG, "Invalid \"%sing chmod\" directive: %s\n", |
767 | am_sender ? "outgo" : "incom", p); | |
768 | } | |
730df9d2 | 769 | |
c9dc1300 | 770 | start_server(f_in, f_out, argc, argv); |
3591c066 AT |
771 | |
772 | return 0; | |
773 | } | |
774 | ||
7a6421fa AT |
775 | /* send a list of available modules to the client. Don't list those |
776 | with "list = False". */ | |
3591c066 AT |
777 | static void send_listing(int fd) |
778 | { | |
779 | int n = lp_numservices(); | |
780 | int i; | |
063393d6 | 781 | |
c0422cea | 782 | for (i = 0; i < n; i++) { |
3591c066 | 783 | if (lp_list(i)) |
4a7144ee | 784 | io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i)); |
c0422cea | 785 | } |
8f04bb36 | 786 | |
daa598df | 787 | if (protocol_version >= 25) |
063393d6 | 788 | io_printf(fd,"@RSYNCD: EXIT\n"); |
3591c066 AT |
789 | } |
790 | ||
68f40ebb | 791 | /* this is called when a connection is established to a client |
3591c066 AT |
792 | and we want to start talking. The setup of the system is done from |
793 | here */ | |
68f40ebb | 794 | int start_daemon(int f_in, int f_out) |
3591c066 | 795 | { |
20accf4d | 796 | char line[1024]; |
7909e65f | 797 | char *addr, *host; |
c0422cea | 798 | int i; |
4cdf25e4 | 799 | |
da3478b2 WD |
800 | io_set_sock_fds(f_in, f_out); |
801 | ||
374c3e12 WD |
802 | /* We must load the config file before calling any function that |
803 | * might cause log-file output to occur. This ensures that the | |
804 | * "log file" param gets honored for the 2 non-forked use-cases | |
08e0a629 | 805 | * (when rsync is run by init and run by a remote shell). */ |
2e94e70e | 806 | if (!lp_load(config_file, 0)) |
65417579 | 807 | exit_cleanup(RERR_SYNTAX); |
3591c066 | 808 | |
374c3e12 WD |
809 | addr = client_addr(f_in); |
810 | host = client_name(f_in); | |
811 | rprintf(FLOG, "connect from %s (%s)\n", host, addr); | |
91d324b4 | 812 | |
68f40ebb WD |
813 | if (!am_server) { |
814 | set_socket_options(f_in, "SO_KEEPALIVE"); | |
34937987 WD |
815 | if (sockopts) |
816 | set_socket_options(f_in, sockopts); | |
817 | else | |
818 | set_socket_options(f_in, lp_socket_options()); | |
68f40ebb WD |
819 | set_nonblocking(f_in); |
820 | } | |
3591c066 | 821 | |
7909e65f | 822 | if (exchange_protocols(f_in, f_out, line, sizeof line, 0) < 0) |
91eee594 | 823 | return -1; |
91eee594 | 824 | |
c0422cea | 825 | line[0] = 0; |
7909e65f | 826 | if (!read_line_old(f_in, line, sizeof line)) |
c0422cea | 827 | return -1; |
3591c066 | 828 | |
c0422cea | 829 | if (!*line || strcmp(line, "#list") == 0) { |
b3e15181 WD |
830 | rprintf(FLOG, "module-list request from %s (%s)\n", |
831 | host, addr); | |
c0422cea WD |
832 | send_listing(f_out); |
833 | return -1; | |
834 | } | |
3591c066 | 835 | |
c0422cea WD |
836 | if (*line == '#') { |
837 | /* it's some sort of command that I don't understand */ | |
838 | io_printf(f_out, "@ERROR: Unknown command '%s'\n", line); | |
839 | return -1; | |
840 | } | |
3591c066 | 841 | |
c0422cea | 842 | if ((i = lp_number(line)) < 0) { |
c0422cea WD |
843 | rprintf(FLOG, "unknown module '%s' tried from %s (%s)\n", |
844 | line, host, addr); | |
845 | io_printf(f_out, "@ERROR: Unknown module '%s'\n", line); | |
846 | return -1; | |
3591c066 AT |
847 | } |
848 | ||
d749eb68 WD |
849 | #ifdef HAVE_SIGACTION |
850 | sigact.sa_flags = SA_NOCLDSTOP; | |
851 | #endif | |
852 | SIGACTION(SIGCHLD, remember_children); | |
853 | ||
439a198d | 854 | return rsync_module(f_in, f_out, i, addr, host); |
3591c066 AT |
855 | } |
856 | ||
dd589118 | 857 | static void create_pid_file(void) |
a1d2685b WD |
858 | { |
859 | char *pid_file = lp_pid_file(); | |
860 | char pidbuf[16]; | |
dd589118 | 861 | pid_t pid = getpid(); |
a1d2685b WD |
862 | int fd; |
863 | ||
864 | if (!pid_file || !*pid_file) | |
865 | return; | |
866 | ||
867 | cleanup_set_pid(pid); | |
dd589118 | 868 | if ((fd = do_open(pid_file, O_WRONLY|O_CREAT|O_EXCL, 0666 & ~orig_umask)) == -1) { |
a1d2685b | 869 | cleanup_set_pid(0); |
dd589118 | 870 | fprintf(stderr, "failed to create pid file %s: %s\n", pid_file, strerror(errno)); |
a1d2685b WD |
871 | rsyserr(FLOG, errno, "failed to create pid file %s", pid_file); |
872 | exit_cleanup(RERR_FILEIO); | |
873 | } | |
874 | snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid); | |
875 | write(fd, pidbuf, strlen(pidbuf)); | |
876 | close(fd); | |
877 | } | |
878 | ||
879 | /* Become a daemon, discarding the controlling terminal. */ | |
880 | static void become_daemon(void) | |
3591c066 | 881 | { |
a1d2685b WD |
882 | int i; |
883 | pid_t pid = fork(); | |
884 | ||
885 | if (pid) { | |
dd589118 WD |
886 | if (pid < 0) { |
887 | fprintf(stderr, "failed to fork: %s\n", strerror(errno)); | |
888 | exit_cleanup(RERR_FILEIO); | |
889 | } | |
a1d2685b WD |
890 | _exit(0); |
891 | } | |
1a016bfd | 892 | |
dd589118 WD |
893 | create_pid_file(); |
894 | ||
a1d2685b WD |
895 | /* detach from the terminal */ |
896 | #ifdef HAVE_SETSID | |
897 | setsid(); | |
898 | #elif defined TIOCNOTTY | |
899 | i = open("/dev/tty", O_RDWR); | |
900 | if (i >= 0) { | |
901 | ioctl(i, (int)TIOCNOTTY, (char *)0); | |
902 | close(i); | |
903 | } | |
904 | #endif | |
905 | /* make sure that stdin, stdout an stderr don't stuff things | |
906 | * up (library functions, for example) */ | |
907 | for (i = 0; i < 3; i++) { | |
908 | close(i); | |
909 | open("/dev/null", O_RDWR); | |
910 | } | |
911 | } | |
912 | ||
913 | int daemon_main(void) | |
914 | { | |
dd589118 WD |
915 | if (!config_file) { |
916 | if (am_server && am_root <= 0) | |
917 | config_file = RSYNCD_USERCONF; | |
918 | else | |
919 | config_file = RSYNCD_SYSCONF; | |
920 | } | |
921 | ||
3591c066 | 922 | if (is_a_socket(STDIN_FILENO)) { |
41979ff8 AT |
923 | int i; |
924 | ||
925 | /* we are running via inetd - close off stdout and | |
4a7144ee WD |
926 | * stderr so that library functions (and getopt) don't |
927 | * try to use them. Redirect them to /dev/null */ | |
2e94e70e | 928 | for (i = 1; i < 3; i++) { |
4a7144ee | 929 | close(i); |
41979ff8 AT |
930 | open("/dev/null", O_RDWR); |
931 | } | |
3eb38818 | 932 | |
68f40ebb | 933 | return start_daemon(STDIN_FILENO, STDIN_FILENO); |
3591c066 AT |
934 | } |
935 | ||
a1d2685b WD |
936 | if (!lp_load(config_file, 1)) { |
937 | fprintf(stderr, "Failed to parse config file: %s\n", config_file); | |
65417579 | 938 | exit_cleanup(RERR_SYNTAX); |
a1d2685b WD |
939 | } |
940 | ||
941 | if (no_detach) | |
dd589118 | 942 | create_pid_file(); |
a1d2685b WD |
943 | else |
944 | become_daemon(); | |
f9e940ef | 945 | |
0c56b1ad WD |
946 | if (rsync_port == 0 && (rsync_port = lp_rsync_port()) == 0) |
947 | rsync_port = RSYNC_PORT; | |
3dfe6e97 | 948 | if (bind_address == NULL && *lp_bind_address()) |
986aaaaa | 949 | bind_address = lp_bind_address(); |
0c56b1ad | 950 | |
6dc9b74b | 951 | log_init(0); |
f9e940ef | 952 | |
9e5a5ddb | 953 | rprintf(FLOG, "rsyncd version %s starting, listening on port %d\n", |
4a7144ee WD |
954 | RSYNC_VERSION, rsync_port); |
955 | /* TODO: If listening on a particular address, then show that | |
956 | * address too. In fact, why not just do inet_ntop on the | |
957 | * local address??? */ | |
e42c9458 | 958 | |
8ef4ffd6 AT |
959 | start_accept_loop(rsync_port, start_daemon); |
960 | return -1; | |
3591c066 | 961 | } |