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