Commit | Line | Data |
---|---|---|
a039749b | 1 | /* -*- c-file-style: "linux"; -*- |
4a7144ee | 2 | * |
a254fd97 MP |
3 | * Copyright (C) 1998-2001 by Andrew Tridgell <tridge@samba.org> |
4 | * Copyright (C) 2001-2002 by Martin Pool <mbp@samba.org> | |
4a7144ee | 5 | * |
a254fd97 MP |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
4a7144ee | 10 | * |
a254fd97 MP |
11 | * This program is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
4a7144ee | 15 | * |
a254fd97 MP |
16 | * You should have received a copy of the GNU General Public License |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
19 | */ | |
3591c066 | 20 | |
a254fd97 MP |
21 | /** |
22 | * @file | |
23 | * | |
24 | * The socket based protocol for setting up a connection with | |
25 | * rsyncd. | |
26 | **/ | |
3591c066 AT |
27 | |
28 | #include "rsync.h" | |
29 | ||
c0814b81 | 30 | extern int verbose; |
7a6653bc | 31 | extern int quiet; |
c0814b81 | 32 | extern int list_only; |
6e195fe9 WD |
33 | extern int am_sender; |
34 | extern int am_server; | |
35 | extern int am_daemon; | |
36 | extern int am_root; | |
3591c066 | 37 | extern int rsync_port; |
8dad7fc6 | 38 | extern int kluge_around_eof; |
6e195fe9 | 39 | extern int daemon_over_rsh; |
b35d0d8e | 40 | extern int sanitize_paths; |
7c2a9e76 | 41 | extern int filesfrom_fd; |
daa598df WD |
42 | extern int remote_protocol; |
43 | extern int protocol_version; | |
6e195fe9 | 44 | extern int io_timeout; |
6e195fe9 WD |
45 | extern int no_detach; |
46 | extern int default_af_hint; | |
2a7d9fe9 | 47 | extern int log_initialised; |
c5b7aa15 | 48 | extern mode_t orig_umask; |
6e195fe9 | 49 | extern char *bind_address; |
34937987 | 50 | extern char *sockopts; |
6e195fe9 | 51 | extern char *config_file; |
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; | |
6e195fe9 WD |
56 | |
57 | char *auth_user; | |
18638730 | 58 | int read_only = 0; |
f39b2060 WD |
59 | int daemon_log_format_has_i = 0; |
60 | int daemon_log_format_has_o_or_i = 0; | |
211bc43b | 61 | int module_id = -1; |
8840ec0f | 62 | struct chmod_mode_struct *daemon_chmod_modes; |
3591c066 | 63 | |
e7bf7c01 WD |
64 | /* Length of lp_path() string when in daemon mode & not chrooted, else 0. */ |
65 | unsigned int module_dirlen = 0; | |
66 | ||
d749eb68 WD |
67 | #ifdef HAVE_SIGACTION |
68 | static struct sigaction sigact; | |
69 | #endif | |
70 | ||
be2961da | 71 | /** |
bc363ea9 | 72 | * Run a client connected to an rsyncd. The alternative to this |
be2961da MP |
73 | * function for remote-shell connections is do_cmd(). |
74 | * | |
fdf88d75 MP |
75 | * After negotiating which module to use and reading the server's |
76 | * motd, this hands over to client_run(). Telling the server the | |
77 | * module will cause it to chroot/setuid/etc. | |
78 | * | |
79 | * Instead of doing a transfer, the client may at this stage instead | |
80 | * get a listing of remote modules and exit. | |
be2961da MP |
81 | * |
82 | * @return -1 for error in startup, or the result of client_run(). | |
d0829892 | 83 | * Either way, it eventually gets passed to exit_cleanup(). |
be2961da | 84 | **/ |
3591c066 AT |
85 | int start_socket_client(char *host, char *path, int argc, char *argv[]) |
86 | { | |
68f40ebb | 87 | int fd, ret; |
2e94e70e | 88 | char *p, *user = NULL; |
4a7144ee | 89 | |
1732b6c0 WD |
90 | /* This is redundant with code in start_inband_exchange(), but this |
91 | * short-circuits a problem in the client before we open a socket, | |
92 | * and the extra check won't hurt. */ | |
f98df1d9 | 93 | if (*path == '/') { |
1732b6c0 WD |
94 | rprintf(FERROR, |
95 | "ERROR: The remote path must start with a module name not a /\n"); | |
f98df1d9 AT |
96 | return -1; |
97 | } | |
98 | ||
b31c92ed | 99 | if ((p = strrchr(host, '@')) != NULL) { |
bcb7e502 AT |
100 | user = host; |
101 | host = p+1; | |
1732b6c0 | 102 | *p = '\0'; |
bcb7e502 AT |
103 | } |
104 | ||
837cbad9 WD |
105 | fd = open_socket_out_wrapped(host, rsync_port, bind_address, |
106 | default_af_hint); | |
df5cd107 | 107 | if (fd == -1) |
65417579 | 108 | exit_cleanup(RERR_SOCKETIO); |
68f40ebb | 109 | |
34937987 WD |
110 | set_socket_options(fd, sockopts); |
111 | ||
68f40ebb WD |
112 | ret = start_inband_exchange(user, path, fd, fd, argc); |
113 | ||
180443af | 114 | return ret ? ret : client_run(fd, fd, -1, argc, argv); |
68f40ebb WD |
115 | } |
116 | ||
b9f592fb WD |
117 | int start_inband_exchange(char *user, char *path, int f_in, int f_out, |
118 | int argc) | |
68f40ebb WD |
119 | { |
120 | int i; | |
121 | char *sargs[MAX_ARGS]; | |
122 | int sargc = 0; | |
20accf4d | 123 | char line[BIGPATHBUFLEN]; |
68f40ebb | 124 | char *p; |
68f40ebb WD |
125 | |
126 | if (argc == 0 && !am_sender) | |
9bcb2595 | 127 | list_only |= 1; |
68f40ebb WD |
128 | |
129 | if (*path == '/') { | |
1732b6c0 WD |
130 | rprintf(FERROR, |
131 | "ERROR: The remote path must start with a module name\n"); | |
68f40ebb WD |
132 | return -1; |
133 | } | |
134 | ||
2e94e70e WD |
135 | if (!user) |
136 | user = getenv("USER"); | |
137 | if (!user) | |
138 | user = getenv("LOGNAME"); | |
68f40ebb | 139 | |
5a8543b8 | 140 | io_printf(f_out, "@RSYNCD: %d\n", protocol_version); |
91eee594 | 141 | |
2e94e70e | 142 | if (!read_line(f_in, line, sizeof line - 1)) { |
be2961da | 143 | rprintf(FERROR, "rsync: did not see server greeting\n"); |
3591c066 AT |
144 | return -1; |
145 | } | |
146 | ||
daa598df | 147 | if (sscanf(line,"@RSYNCD: %d", &remote_protocol) != 1) { |
be2961da MP |
148 | /* note that read_line strips of \n or \r */ |
149 | rprintf(FERROR, "rsync: server sent \"%s\" rather than greeting\n", | |
150 | line); | |
3591c066 AT |
151 | return -1; |
152 | } | |
daa598df WD |
153 | if (protocol_version > remote_protocol) |
154 | protocol_version = remote_protocol; | |
3591c066 | 155 | |
9bcb2595 WD |
156 | if (list_only && protocol_version >= 29) |
157 | list_only |= 2; | |
158 | ||
159 | /* set daemon_over_rsh to false since we need to build the | |
160 | * true set of args passed through the rsh/ssh connection; | |
161 | * this is a no-op for direct-socket-connection mode */ | |
162 | daemon_over_rsh = 0; | |
163 | server_options(sargs, &sargc); | |
164 | ||
165 | sargs[sargc++] = "."; | |
166 | ||
167 | if (path && *path) | |
168 | sargs[sargc++] = path; | |
169 | ||
170 | sargs[sargc] = NULL; | |
171 | ||
172 | if (verbose > 1) | |
173 | print_child_argv(sargs); | |
174 | ||
2c91d3d3 AT |
175 | p = strchr(path,'/'); |
176 | if (p) *p = 0; | |
68f40ebb | 177 | io_printf(f_out, "%s\n", path); |
2c91d3d3 AT |
178 | if (p) *p = '/'; |
179 | ||
063393d6 MP |
180 | /* Old servers may just drop the connection here, |
181 | rather than sending a proper EXIT command. Yuck. */ | |
8dad7fc6 | 182 | kluge_around_eof = list_only && protocol_version < 25 ? 1 : 0; |
7a55d06e | 183 | |
063393d6 | 184 | while (1) { |
2e94e70e | 185 | if (!read_line(f_in, line, sizeof line - 1)) { |
be2961da | 186 | rprintf(FERROR, "rsync: didn't get server startup line\n"); |
3591c066 AT |
187 | return -1; |
188 | } | |
31593dd6 | 189 | |
31593dd6 | 190 | if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) { |
68f40ebb | 191 | auth_client(f_out, user, line+18); |
31593dd6 AT |
192 | continue; |
193 | } | |
31593dd6 | 194 | |
2e94e70e WD |
195 | if (strcmp(line,"@RSYNCD: OK") == 0) |
196 | break; | |
8f04bb36 | 197 | |
cae95647 MP |
198 | if (strcmp(line,"@RSYNCD: EXIT") == 0) { |
199 | /* This is sent by recent versions of the | |
200 | * server to terminate the listing of modules. | |
201 | * We don't want to go on and transfer | |
202 | * anything; just exit. */ | |
203 | exit(0); | |
204 | } | |
8f04bb36 | 205 | |
136ac7ec | 206 | if (strncmp(line, "@ERROR", 6) == 0) { |
1732b6c0 | 207 | rprintf(FERROR, "%s\n", line); |
136ac7ec MP |
208 | /* This is always fatal; the server will now |
209 | * close the socket. */ | |
180443af | 210 | return -1; |
136ac7ec | 211 | } |
180443af WD |
212 | |
213 | rprintf(FINFO, "%s\n", line); | |
3591c066 | 214 | } |
8dad7fc6 | 215 | kluge_around_eof = 0; |
3591c066 | 216 | |
68f40ebb WD |
217 | for (i = 0; i < sargc; i++) { |
218 | io_printf(f_out, "%s\n", sargs[i]); | |
3591c066 | 219 | } |
68f40ebb | 220 | io_printf(f_out, "\n"); |
3591c066 | 221 | |
daa598df | 222 | if (protocol_version < 23) { |
3f55bd5d | 223 | if (protocol_version == 22 || !am_sender) |
da3478b2 | 224 | io_start_multiplex_in(); |
09b7f5db | 225 | } |
8d9dc9f9 | 226 | |
68f40ebb | 227 | return 0; |
3591c066 AT |
228 | } |
229 | ||
141c6265 WD |
230 | static char *finish_pre_exec(pid_t pid, int fd, char *request, |
231 | int argc, char *argv[]) | |
c95ca2a2 | 232 | { |
141c6265 | 233 | int j, status = -1; |
3591c066 | 234 | |
c95ca2a2 | 235 | if (request) { |
141c6265 WD |
236 | write_buf(fd, request, strlen(request)+1); |
237 | for (j = 0; j < argc; j++) | |
238 | write_buf(fd, argv[j], strlen(argv[j])+1); | |
c95ca2a2 | 239 | } |
141c6265 WD |
240 | |
241 | write_byte(fd, 0); | |
242 | ||
c95ca2a2 WD |
243 | close(fd); |
244 | ||
245 | if (wait_process(pid, &status, 0) < 0 | |
246 | || !WIFEXITED(status) || WEXITSTATUS(status) != 0) { | |
247 | char *e; | |
248 | if (asprintf(&e, "pre-xfer exec returned failure (%d)\n", status) < 0) | |
249 | out_of_memory("finish_pre_exec"); | |
250 | return e; | |
251 | } | |
252 | return NULL; | |
253 | } | |
3591c066 | 254 | |
141c6265 WD |
255 | static int read_arg_from_pipe(int fd, char *buf, int limit) |
256 | { | |
257 | char *bp = buf, *eob = buf + limit - 1; | |
258 | ||
259 | while (1) { | |
260 | if (read(fd, bp, 1) != 1) | |
261 | return -1; | |
262 | if (*bp == '\0') | |
263 | break; | |
264 | if (bp < eob) | |
265 | bp++; | |
266 | } | |
267 | *bp = '\0'; | |
268 | ||
269 | return bp - buf; | |
270 | } | |
271 | ||
439a198d | 272 | static int rsync_module(int f_in, int f_out, int i, char *addr, char *host) |
3591c066 | 273 | { |
2e94e70e | 274 | int argc = 0; |
b7061c82 WD |
275 | int maxargs; |
276 | char **argv; | |
20accf4d | 277 | char line[BIGPATHBUFLEN]; |
2af27ad9 | 278 | uid_t uid = (uid_t)-2; /* canonically "nobody" */ |
1a016bfd | 279 | gid_t gid = (gid_t)-2; |
c95ca2a2 | 280 | char *p, *err_msg = NULL; |
874895d5 | 281 | char *name = lp_name(i); |
8638dd48 | 282 | int use_chroot = lp_use_chroot(i); |
2e94e70e | 283 | int start_glob = 0; |
c95ca2a2 WD |
284 | int ret, pre_exec_fd = -1; |
285 | pid_t pre_exec_pid = 0; | |
2e94e70e | 286 | char *request = NULL; |
56c473b7 AT |
287 | |
288 | if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) { | |
1732b6c0 | 289 | rprintf(FLOG, "rsync denied on module %s from %s (%s)\n", |
31ec50d7 | 290 | name, host, addr); |
c0422cea WD |
291 | if (!lp_list(i)) |
292 | io_printf(f_out, "@ERROR: Unknown module '%s'\n", name); | |
293 | else { | |
294 | io_printf(f_out, | |
295 | "@ERROR: access denied to %s from %s (%s)\n", | |
296 | name, host, addr); | |
297 | } | |
56c473b7 AT |
298 | return -1; |
299 | } | |
3591c066 | 300 | |
68f40ebb | 301 | if (am_daemon && am_server) { |
9e5a5ddb | 302 | rprintf(FLOG, "rsync allowed access on module %s from %s (%s)\n", |
68f40ebb WD |
303 | name, host, addr); |
304 | } | |
305 | ||
5e71c444 | 306 | if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) { |
8d72ef6e | 307 | if (errno) { |
1732b6c0 | 308 | rsyserr(FLOG, errno, "failed to open lock file %s", |
45c49b52 | 309 | lp_lock_file(i)); |
4875d6b6 | 310 | io_printf(f_out, "@ERROR: failed to open lock file\n"); |
8d72ef6e | 311 | } else { |
1732b6c0 | 312 | rprintf(FLOG, "max connections (%d) reached\n", |
5e71c444 | 313 | lp_max_connections(i)); |
4ccfd96c | 314 | io_printf(f_out, "@ERROR: max connections (%d) reached -- try again later\n", |
837cbad9 | 315 | lp_max_connections(i)); |
8d72ef6e | 316 | } |
0c515f17 AT |
317 | return -1; |
318 | } | |
319 | ||
45c5b903 | 320 | auth_user = auth_server(f_in, f_out, i, host, addr, "@RSYNCD: AUTHREQD "); |
d0d56395 | 321 | |
97cb8dc2 | 322 | if (!auth_user) { |
68f40ebb | 323 | io_printf(f_out, "@ERROR: auth failed on module %s\n", name); |
4a7144ee | 324 | return -1; |
d0d56395 AT |
325 | } |
326 | ||
3591c066 AT |
327 | module_id = i; |
328 | ||
211bc43b | 329 | if (lp_read_only(i)) |
18638730 WD |
330 | read_only = 1; |
331 | ||
f39b2060 | 332 | if (lp_transfer_logging(i)) { |
624d6be2 | 333 | if (log_format_has(lp_log_format(i), 'i')) |
f39b2060 WD |
334 | daemon_log_format_has_i = 1; |
335 | if (daemon_log_format_has_i | |
624d6be2 | 336 | || log_format_has(lp_log_format(i), 'o')) |
f39b2060 WD |
337 | daemon_log_format_has_o_or_i = 1; |
338 | } | |
c0814b81 | 339 | |
6fe05820 | 340 | am_root = (MY_UID() == 0); |
8ef4ffd6 | 341 | |
716baed7 DD |
342 | if (am_root) { |
343 | p = lp_uid(i); | |
344 | if (!name_to_uid(p, &uid)) { | |
2e94e70e | 345 | if (!isdigit(*(unsigned char *)p)) { |
1732b6c0 | 346 | rprintf(FLOG, "Invalid uid %s\n", p); |
68f40ebb | 347 | io_printf(f_out, "@ERROR: invalid uid %s\n", p); |
716baed7 | 348 | return -1; |
4a7144ee | 349 | } |
716baed7 DD |
350 | uid = atoi(p); |
351 | } | |
352 | ||
353 | p = lp_gid(i); | |
354 | if (!name_to_gid(p, &gid)) { | |
2e94e70e | 355 | if (!isdigit(*(unsigned char *)p)) { |
1732b6c0 | 356 | rprintf(FLOG, "Invalid gid %s\n", p); |
68f40ebb | 357 | io_printf(f_out, "@ERROR: invalid gid %s\n", p); |
716baed7 | 358 | return -1; |
4a7144ee | 359 | } |
716baed7 DD |
360 | gid = atoi(p); |
361 | } | |
8ef4ffd6 | 362 | } |
3b2b5345 | 363 | |
4a7144ee WD |
364 | /* TODO: If we're not root, but the configuration requests |
365 | * that we change to some uid other than the current one, then | |
366 | * log a warning. */ | |
367 | ||
368 | /* TODO: Perhaps take a list of gids, and make them into the | |
369 | * supplementary groups. */ | |
8ef4ffd6 | 370 | |
46bffd98 | 371 | if (use_chroot || (module_dirlen = strlen(lp_path(i))) == 1) { |
e7bf7c01 | 372 | module_dirlen = 0; |
7842418b | 373 | set_filter_dir("/", 1); |
46bffd98 | 374 | } else |
7842418b | 375 | set_filter_dir(lp_path(i), module_dirlen); |
e7bf7c01 WD |
376 | |
377 | p = lp_filter(i); | |
ebfd1a1c | 378 | parse_rule(&server_filter_list, p, MATCHFLG_WORD_SPLIT, |
2c8c8bba | 379 | XFLG_ABS_IF_SLASH); |
837cbad9 | 380 | |
cd64343a | 381 | p = lp_include_from(i); |
ebfd1a1c | 382 | parse_filter_file(&server_filter_list, p, MATCHFLG_INCLUDE, |
2c8c8bba | 383 | XFLG_ABS_IF_SLASH | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS); |
cd64343a DD |
384 | |
385 | p = lp_include(i); | |
ebfd1a1c | 386 | parse_rule(&server_filter_list, p, |
0a68f869 | 387 | MATCHFLG_INCLUDE | MATCHFLG_WORD_SPLIT, |
2c8c8bba | 388 | XFLG_ABS_IF_SLASH | XFLG_OLD_PREFIXES); |
cd64343a | 389 | |
8f3a2d54 | 390 | p = lp_exclude_from(i); |
ebfd1a1c | 391 | parse_filter_file(&server_filter_list, p, 0, |
2c8c8bba | 392 | XFLG_ABS_IF_SLASH | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS); |
8f3a2d54 | 393 | |
5805327b | 394 | p = lp_exclude(i); |
ebfd1a1c | 395 | parse_rule(&server_filter_list, p, MATCHFLG_WORD_SPLIT, |
2c8c8bba | 396 | XFLG_ABS_IF_SLASH | XFLG_OLD_PREFIXES); |
8f3a2d54 | 397 | |
45a83540 | 398 | log_init(); |
1a016bfd | 399 | |
9d0d18b5 | 400 | #ifdef HAVE_PUTENV |
c95ca2a2 | 401 | if (*lp_prexfer_exec(i) || *lp_postxfer_exec(i)) { |
9d0d18b5 WD |
402 | char *modname, *modpath, *hostaddr, *hostname, *username; |
403 | int status; | |
404 | if (asprintf(&modname, "RSYNC_MODULE_NAME=%s", name) < 0 | |
405 | || asprintf(&modpath, "RSYNC_MODULE_PATH=%s", lp_path(i)) < 0 | |
406 | || asprintf(&hostaddr, "RSYNC_HOST_ADDR=%s", addr) < 0 | |
407 | || asprintf(&hostname, "RSYNC_HOST_NAME=%s", host) < 0 | |
408 | || asprintf(&username, "RSYNC_USER_NAME=%s", auth_user) < 0) | |
409 | out_of_memory("rsync_module"); | |
410 | putenv(modname); | |
411 | putenv(modpath); | |
412 | putenv(hostaddr); | |
413 | putenv(hostname); | |
414 | putenv(username); | |
415 | umask(orig_umask); | |
c95ca2a2 WD |
416 | /* For post-xfer exec, fork a new process to run the rsync |
417 | * daemon while this process waits for the exit status and | |
418 | * runs the indicated command at that point. */ | |
419 | if (*lp_postxfer_exec(i)) { | |
9d0d18b5 WD |
420 | pid_t pid = fork(); |
421 | if (pid < 0) { | |
422 | rsyserr(FLOG, errno, "fork failed"); | |
423 | io_printf(f_out, "@ERROR: fork failed\n"); | |
424 | return -1; | |
425 | } | |
426 | if (pid) { | |
427 | char *ret1, *ret2; | |
c95ca2a2 WD |
428 | if (wait_process(pid, &status, 0) < 0) |
429 | status = -1; | |
9d0d18b5 WD |
430 | if (asprintf(&ret1, "RSYNC_RAW_STATUS=%d", status) > 0) |
431 | putenv(ret1); | |
432 | if (WIFEXITED(status)) | |
433 | status = WEXITSTATUS(status); | |
434 | else | |
435 | status = -1; | |
436 | if (asprintf(&ret2, "RSYNC_EXIT_STATUS=%d", status) > 0) | |
437 | putenv(ret2); | |
c95ca2a2 | 438 | system(lp_postxfer_exec(i)); |
9d0d18b5 WD |
439 | _exit(status); |
440 | } | |
441 | } | |
c95ca2a2 WD |
442 | /* For pre-xfer exec, fork a child process to run the indicated |
443 | * command, though it first waits for the parent process to | |
444 | * send us the user's request via a pipe. */ | |
445 | if (*lp_prexfer_exec(i)) { | |
446 | int fds[2]; | |
447 | if (pipe(fds) < 0 || (pre_exec_pid = fork()) < 0) { | |
448 | rsyserr(FLOG, errno, "pre-xfer exec preparation failed"); | |
449 | io_printf(f_out, "@ERROR: pre-xfer exec preparation failed\n"); | |
450 | return -1; | |
451 | } | |
452 | if (pre_exec_pid == 0) { | |
141c6265 WD |
453 | char buf[BIGPATHBUFLEN]; |
454 | int j, len; | |
c95ca2a2 WD |
455 | close(fds[1]); |
456 | set_blocking(fds[0]); | |
141c6265 | 457 | len = read_arg_from_pipe(fds[0], buf, BIGPATHBUFLEN); |
c95ca2a2 WD |
458 | if (len <= 0) |
459 | _exit(1); | |
c95ca2a2 WD |
460 | if (asprintf(&p, "RSYNC_REQUEST=%s", buf) < 0) |
461 | out_of_memory("rsync_module"); | |
462 | putenv(p); | |
141c6265 WD |
463 | for (j = 0; ; j++) { |
464 | len = read_arg_from_pipe(fds[0], buf, | |
465 | BIGPATHBUFLEN); | |
466 | if (len <= 0) { | |
467 | if (!len) | |
468 | break; | |
469 | _exit(1); | |
470 | } | |
471 | if (asprintf(&p, "RSYNC_ARG%d=%s", j, buf) < 0) | |
472 | out_of_memory("rsync_module"); | |
473 | putenv(p); | |
474 | } | |
475 | close(fds[0]); | |
c95ca2a2 WD |
476 | close(STDIN_FILENO); |
477 | close(STDOUT_FILENO); | |
478 | status = system(lp_prexfer_exec(i)); | |
479 | if (!WIFEXITED(status)) | |
480 | _exit(1); | |
481 | _exit(WEXITSTATUS(status)); | |
482 | } | |
483 | close(fds[0]); | |
484 | set_blocking(fds[1]); | |
485 | pre_exec_fd = fds[1]; | |
486 | } | |
9d0d18b5 WD |
487 | umask(0); |
488 | } | |
489 | #endif | |
490 | ||
8638dd48 | 491 | if (use_chroot) { |
b52c1d9d MP |
492 | /* |
493 | * XXX: The 'use chroot' flag is a fairly reliable | |
494 | * source of confusion, because it fails under two | |
495 | * important circumstances: running as non-root, | |
496 | * running on Win32 (or possibly others). On the | |
497 | * other hand, if you are running as root, then it | |
498 | * might be better to always use chroot. | |
499 | * | |
500 | * So, perhaps if we can't chroot we should just issue | |
501 | * a warning, unless a "require chroot" flag is set, | |
502 | * in which case we fail. | |
503 | */ | |
8638dd48 | 504 | if (chroot(lp_path(i))) { |
4875d6b6 | 505 | rsyserr(FLOG, errno, "chroot %s failed", |
45c49b52 | 506 | lp_path(i)); |
68f40ebb | 507 | io_printf(f_out, "@ERROR: chroot failed\n"); |
8638dd48 DD |
508 | return -1; |
509 | } | |
3591c066 | 510 | |
59187666 | 511 | if (!push_dir("/")) { |
4875d6b6 | 512 | rsyserr(FLOG, errno, "chdir %s failed\n", |
45c49b52 | 513 | lp_path(i)); |
68f40ebb | 514 | io_printf(f_out, "@ERROR: chdir failed\n"); |
8638dd48 DD |
515 | return -1; |
516 | } | |
3591c066 | 517 | |
716baed7 | 518 | } else { |
59187666 | 519 | if (!push_dir(lp_path(i))) { |
4875d6b6 | 520 | rsyserr(FLOG, errno, "chdir %s failed\n", |
45c49b52 | 521 | lp_path(i)); |
68f40ebb | 522 | io_printf(f_out, "@ERROR: chdir failed\n"); |
716baed7 DD |
523 | return -1; |
524 | } | |
cb13abfe | 525 | sanitize_paths = 1; |
716baed7 DD |
526 | } |
527 | ||
528 | if (am_root) { | |
715d1f45 MP |
529 | /* XXXX: You could argue that if the daemon is started |
530 | * by a non-root user and they explicitly specify a | |
531 | * gid, then we should try to change to that gid -- | |
532 | * this could be possible if it's already in their | |
533 | * supplementary groups. */ | |
534 | ||
535 | /* TODO: Perhaps we need to document that if rsyncd is | |
536 | * started by somebody other than root it will inherit | |
537 | * all their supplementary groups. */ | |
538 | ||
716baed7 | 539 | if (setgid(gid)) { |
1732b6c0 | 540 | rsyserr(FLOG, errno, "setgid %d failed", (int)gid); |
68f40ebb | 541 | io_printf(f_out, "@ERROR: setgid failed\n"); |
8638dd48 DD |
542 | return -1; |
543 | } | |
4f5b0756 | 544 | #ifdef HAVE_SETGROUPS |
6969ebcf WD |
545 | /* Get rid of any supplementary groups this process |
546 | * might have inheristed. */ | |
547 | if (setgroups(1, &gid)) { | |
1732b6c0 | 548 | rsyserr(FLOG, errno, "setgroups failed"); |
6969ebcf WD |
549 | io_printf(f_out, "@ERROR: setgroups failed\n"); |
550 | return -1; | |
551 | } | |
552 | #endif | |
3591c066 | 553 | |
716baed7 | 554 | if (setuid(uid)) { |
1732b6c0 | 555 | rsyserr(FLOG, errno, "setuid %d failed", (int)uid); |
68f40ebb | 556 | io_printf(f_out, "@ERROR: setuid failed\n"); |
8638dd48 DD |
557 | return -1; |
558 | } | |
559 | ||
6fe05820 | 560 | am_root = (MY_UID() == 0); |
3591c066 AT |
561 | } |
562 | ||
fed1f3f4 WD |
563 | if (lp_temp_dir(i) && *lp_temp_dir(i)) { |
564 | tmpdir = lp_temp_dir(i); | |
565 | if (strlen(tmpdir) >= MAXPATHLEN - 10) { | |
566 | rprintf(FLOG, | |
567 | "the 'temp dir' value for %s is WAY too long -- ignoring.\n", | |
568 | name); | |
569 | tmpdir = NULL; | |
570 | } | |
571 | } | |
572 | ||
68f40ebb | 573 | io_printf(f_out, "@RSYNCD: OK\n"); |
3591c066 | 574 | |
b7061c82 WD |
575 | maxargs = MAX_ARGS; |
576 | if (!(argv = new_array(char *, maxargs))) | |
577 | out_of_memory("rsync_module"); | |
3591c066 AT |
578 | argv[argc++] = "rsyncd"; |
579 | ||
580 | while (1) { | |
2e94e70e | 581 | if (!read_line(f_in, line, sizeof line - 1)) |
3591c066 | 582 | return -1; |
3591c066 | 583 | |
2e94e70e WD |
584 | if (!*line) |
585 | break; | |
3591c066 | 586 | |
874895d5 AT |
587 | p = line; |
588 | ||
b7061c82 WD |
589 | if (argc == maxargs) { |
590 | maxargs += MAX_ARGS; | |
591 | if (!(argv = realloc_array(argv, char *, maxargs))) | |
592 | out_of_memory("rsync_module"); | |
593 | } | |
2e94e70e | 594 | if (!(argv[argc] = strdup(p))) |
b7061c82 | 595 | out_of_memory("rsync_module"); |
3591c066 | 596 | |
20accf4d WD |
597 | switch (start_glob) { |
598 | case 0: | |
874895d5 | 599 | argc++; |
20accf4d WD |
600 | if (strcmp(line, ".") == 0) |
601 | start_glob = 1; | |
602 | break; | |
603 | case 1: | |
c95ca2a2 WD |
604 | if (pre_exec_pid) { |
605 | err_msg = finish_pre_exec(pre_exec_pid, | |
141c6265 WD |
606 | pre_exec_fd, p, |
607 | argc, argv); | |
c95ca2a2 WD |
608 | pre_exec_pid = 0; |
609 | } | |
20accf4d WD |
610 | request = strdup(p); |
611 | start_glob = 2; | |
612 | /* FALL THROUGH */ | |
613 | default: | |
c95ca2a2 WD |
614 | if (!err_msg) |
615 | glob_expand(name, &argv, &argc, &maxargs); | |
20accf4d WD |
616 | break; |
617 | } | |
3591c066 AT |
618 | } |
619 | ||
141c6265 WD |
620 | if (pre_exec_pid) { |
621 | err_msg = finish_pre_exec(pre_exec_pid, pre_exec_fd, request, | |
622 | argc, argv); | |
623 | } | |
c95ca2a2 | 624 | |
18638730 | 625 | verbose = 0; /* future verbosity is controlled by client options */ |
c9dc1300 | 626 | ret = parse_arguments(&argc, (const char ***) &argv, 0); |
7a6653bc | 627 | quiet = 0; /* Don't let someone try to be tricky. */ |
3591c066 | 628 | |
7c2a9e76 WD |
629 | if (filesfrom_fd == 0) |
630 | filesfrom_fd = f_in; | |
631 | ||
7b372642 | 632 | if (request) { |
97cb8dc2 | 633 | if (*auth_user) { |
9e5a5ddb WD |
634 | rprintf(FLOG, "rsync %s %s from %s@%s (%s)\n", |
635 | am_sender ? "on" : "to", | |
97cb8dc2 | 636 | request, auth_user, host, addr); |
d0d56395 | 637 | } else { |
9e5a5ddb WD |
638 | rprintf(FLOG, "rsync %s %s from %s (%s)\n", |
639 | am_sender ? "on" : "to", | |
d0d56395 AT |
640 | request, host, addr); |
641 | } | |
7b372642 AT |
642 | free(request); |
643 | } | |
644 | ||
15b7b73d | 645 | #ifndef DEBUG |
3591c066 | 646 | /* don't allow the logs to be flooded too fast */ |
59b0e7a8 WD |
647 | if (verbose > lp_max_verbosity(i)) |
648 | verbose = lp_max_verbosity(i); | |
0199b05f | 649 | #endif |
3591c066 | 650 | |
1732b6c0 WD |
651 | if (protocol_version < 23 |
652 | && (protocol_version == 22 || am_sender)) | |
da3478b2 | 653 | io_start_multiplex_out(); |
c95ca2a2 | 654 | else if (!ret || err_msg) { |
1732b6c0 WD |
655 | /* We have to get I/O multiplexing started so that we can |
656 | * get the error back to the client. This means getting | |
657 | * the protocol setup finished first in later versions. */ | |
658 | setup_protocol(f_out, f_in); | |
b03c719f WD |
659 | if (!am_sender) { |
660 | /* Since we failed in our option parsing, we may not | |
661 | * have finished parsing that the client sent us a | |
662 | * --files-from option, so look for it manually. | |
663 | * Without this, the socket would be in the wrong | |
664 | * state for the upcoming error message. */ | |
665 | if (!files_from) { | |
666 | int i; | |
667 | for (i = 0; i < argc; i++) { | |
668 | if (strncmp(argv[i], "--files-from", 12) == 0) { | |
669 | files_from = ""; | |
670 | break; | |
671 | } | |
672 | } | |
673 | } | |
674 | if (files_from) | |
675 | write_byte(f_out, 0); | |
676 | } | |
da3478b2 | 677 | io_start_multiplex_out(); |
554e0a8d | 678 | } |
15b7b73d | 679 | |
c95ca2a2 WD |
680 | if (!ret || err_msg) { |
681 | if (err_msg) | |
682 | rprintf(FERROR, err_msg); | |
683 | else | |
684 | option_error(); | |
7e561438 | 685 | msleep(400); |
4a7144ee | 686 | exit_cleanup(RERR_UNSUPPORTED); |
41979ff8 AT |
687 | } |
688 | ||
3e6ddb37 WD |
689 | if (lp_timeout(i) && lp_timeout(i) > io_timeout) |
690 | set_io_timeout(lp_timeout(i)); | |
81791cfc | 691 | |
f041b025 WD |
692 | /* If we have some incoming/outgoing chmod changes, append them to |
693 | * any user-specified changes (making our changes have priority). | |
694 | * We also get a pointer to just our changes so that a receiver | |
695 | * process can use them separately if --perms wasn't specified. */ | |
aaccaa88 WD |
696 | if (am_sender) |
697 | p = lp_outgoing_chmod(i); | |
698 | else | |
699 | p = lp_incoming_chmod(i); | |
8840ec0f | 700 | if (*p && !(daemon_chmod_modes = parse_chmod(p, &chmod_modes))) { |
aaccaa88 WD |
701 | rprintf(FLOG, "Invalid \"%sing chmod\" directive: %s\n", |
702 | am_sender ? "outgo" : "incom", p); | |
703 | } | |
730df9d2 | 704 | |
c9dc1300 | 705 | start_server(f_in, f_out, argc, argv); |
3591c066 AT |
706 | |
707 | return 0; | |
708 | } | |
709 | ||
7a6421fa AT |
710 | /* send a list of available modules to the client. Don't list those |
711 | with "list = False". */ | |
3591c066 AT |
712 | static void send_listing(int fd) |
713 | { | |
714 | int n = lp_numservices(); | |
715 | int i; | |
063393d6 | 716 | |
c0422cea | 717 | for (i = 0; i < n; i++) { |
3591c066 | 718 | if (lp_list(i)) |
4a7144ee | 719 | io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i)); |
c0422cea | 720 | } |
8f04bb36 | 721 | |
daa598df | 722 | if (protocol_version >= 25) |
063393d6 | 723 | io_printf(fd,"@RSYNCD: EXIT\n"); |
3591c066 AT |
724 | } |
725 | ||
68f40ebb | 726 | /* this is called when a connection is established to a client |
3591c066 AT |
727 | and we want to start talking. The setup of the system is done from |
728 | here */ | |
68f40ebb | 729 | int start_daemon(int f_in, int f_out) |
3591c066 | 730 | { |
20accf4d | 731 | char line[1024]; |
3591c066 | 732 | char *motd; |
439a198d WD |
733 | char *addr = client_addr(f_in); |
734 | char *host = client_name(f_in); | |
c0422cea | 735 | int i; |
4cdf25e4 | 736 | |
da3478b2 WD |
737 | io_set_sock_fds(f_in, f_out); |
738 | ||
2a7d9fe9 WD |
739 | if (log_initialised) |
740 | rprintf(FLOG, "connect from %s (%s)\n", host, addr); | |
741 | ||
2e94e70e | 742 | if (!lp_load(config_file, 0)) |
65417579 | 743 | exit_cleanup(RERR_SYNTAX); |
3591c066 | 744 | |
2a7d9fe9 WD |
745 | if (!log_initialised) |
746 | log_init(); | |
91d324b4 | 747 | |
68f40ebb WD |
748 | if (!am_server) { |
749 | set_socket_options(f_in, "SO_KEEPALIVE"); | |
34937987 WD |
750 | if (sockopts) |
751 | set_socket_options(f_in, sockopts); | |
752 | else | |
753 | set_socket_options(f_in, lp_socket_options()); | |
68f40ebb WD |
754 | set_nonblocking(f_in); |
755 | } | |
3591c066 | 756 | |
5a8543b8 | 757 | io_printf(f_out, "@RSYNCD: %d\n", protocol_version); |
3591c066 AT |
758 | |
759 | motd = lp_motd_file(); | |
27d3cdbc | 760 | if (motd && *motd) { |
0090cbdb | 761 | FILE *f = fopen(motd,"r"); |
3591c066 | 762 | while (f && !feof(f)) { |
2e94e70e | 763 | int len = fread(line, 1, sizeof line - 1, f); |
3591c066 AT |
764 | if (len > 0) { |
765 | line[len] = 0; | |
68f40ebb | 766 | io_printf(f_out, "%s", line); |
3591c066 AT |
767 | } |
768 | } | |
2e94e70e WD |
769 | if (f) |
770 | fclose(f); | |
68f40ebb | 771 | io_printf(f_out, "\n"); |
3591c066 AT |
772 | } |
773 | ||
2e94e70e | 774 | if (!read_line(f_in, line, sizeof line - 1)) |
91eee594 | 775 | return -1; |
91eee594 | 776 | |
daa598df | 777 | if (sscanf(line,"@RSYNCD: %d", &remote_protocol) != 1) { |
68f40ebb | 778 | io_printf(f_out, "@ERROR: protocol startup error\n"); |
91eee594 | 779 | return -1; |
4a7144ee | 780 | } |
daa598df WD |
781 | if (protocol_version > remote_protocol) |
782 | protocol_version = remote_protocol; | |
91eee594 | 783 | |
c0422cea WD |
784 | line[0] = 0; |
785 | if (!read_line(f_in, line, sizeof line - 1)) | |
786 | return -1; | |
3591c066 | 787 | |
c0422cea | 788 | if (!*line || strcmp(line, "#list") == 0) { |
b3e15181 WD |
789 | rprintf(FLOG, "module-list request from %s (%s)\n", |
790 | host, addr); | |
c0422cea WD |
791 | send_listing(f_out); |
792 | return -1; | |
793 | } | |
3591c066 | 794 | |
c0422cea WD |
795 | if (*line == '#') { |
796 | /* it's some sort of command that I don't understand */ | |
797 | io_printf(f_out, "@ERROR: Unknown command '%s'\n", line); | |
798 | return -1; | |
799 | } | |
3591c066 | 800 | |
c0422cea | 801 | if ((i = lp_number(line)) < 0) { |
c0422cea WD |
802 | rprintf(FLOG, "unknown module '%s' tried from %s (%s)\n", |
803 | line, host, addr); | |
804 | io_printf(f_out, "@ERROR: Unknown module '%s'\n", line); | |
805 | return -1; | |
3591c066 AT |
806 | } |
807 | ||
d749eb68 WD |
808 | #ifdef HAVE_SIGACTION |
809 | sigact.sa_flags = SA_NOCLDSTOP; | |
810 | #endif | |
811 | SIGACTION(SIGCHLD, remember_children); | |
812 | ||
439a198d | 813 | return rsync_module(f_in, f_out, i, addr, host); |
3591c066 AT |
814 | } |
815 | ||
3591c066 AT |
816 | int daemon_main(void) |
817 | { | |
8638dd48 | 818 | char *pid_file; |
1a016bfd | 819 | |
3591c066 | 820 | if (is_a_socket(STDIN_FILENO)) { |
41979ff8 AT |
821 | int i; |
822 | ||
823 | /* we are running via inetd - close off stdout and | |
4a7144ee WD |
824 | * stderr so that library functions (and getopt) don't |
825 | * try to use them. Redirect them to /dev/null */ | |
2e94e70e | 826 | for (i = 1; i < 3; i++) { |
4a7144ee | 827 | close(i); |
41979ff8 AT |
828 | open("/dev/null", O_RDWR); |
829 | } | |
3eb38818 | 830 | |
68f40ebb | 831 | return start_daemon(STDIN_FILENO, STDIN_FILENO); |
3591c066 AT |
832 | } |
833 | ||
13e29995 | 834 | if (!no_detach) |
4a7144ee | 835 | become_daemon(); |
3591c066 | 836 | |
2e94e70e | 837 | if (!lp_load(config_file, 1)) |
65417579 | 838 | exit_cleanup(RERR_SYNTAX); |
f9e940ef | 839 | |
0c56b1ad WD |
840 | if (rsync_port == 0 && (rsync_port = lp_rsync_port()) == 0) |
841 | rsync_port = RSYNC_PORT; | |
3dfe6e97 | 842 | if (bind_address == NULL && *lp_bind_address()) |
986aaaaa | 843 | bind_address = lp_bind_address(); |
0c56b1ad | 844 | |
45a83540 | 845 | log_init(); |
f9e940ef | 846 | |
9e5a5ddb | 847 | rprintf(FLOG, "rsyncd version %s starting, listening on port %d\n", |
4a7144ee WD |
848 | RSYNC_VERSION, rsync_port); |
849 | /* TODO: If listening on a particular address, then show that | |
850 | * address too. In fact, why not just do inet_ntop on the | |
851 | * local address??? */ | |
e42c9458 | 852 | |
8638dd48 | 853 | if (((pid_file = lp_pid_file()) != NULL) && (*pid_file != '\0')) { |
ad517ce5 DD |
854 | char pidbuf[16]; |
855 | int fd; | |
05b7bab8 | 856 | pid_t pid = getpid(); |
8638dd48 | 857 | cleanup_set_pid(pid); |
ad517ce5 DD |
858 | if ((fd = do_open(lp_pid_file(), O_WRONLY|O_CREAT|O_TRUNC, |
859 | 0666 & ~orig_umask)) == -1) { | |
4a7144ee | 860 | cleanup_set_pid(0); |
4875d6b6 | 861 | rsyserr(FLOG, errno, "failed to create pid file %s", |
45c49b52 | 862 | pid_file); |
4a7144ee | 863 | exit_cleanup(RERR_FILEIO); |
8638dd48 | 864 | } |
05b7bab8 | 865 | snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid); |
ad517ce5 DD |
866 | write(fd, pidbuf, strlen(pidbuf)); |
867 | close(fd); | |
8638dd48 DD |
868 | } |
869 | ||
8ef4ffd6 AT |
870 | start_accept_loop(rsync_port, start_daemon); |
871 | return -1; | |
3591c066 | 872 | } |