Commit | Line | Data |
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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 WD |
44 | extern int io_timeout; |
45 | extern int orig_umask; | |
46 | extern int no_detach; | |
47 | extern int default_af_hint; | |
48 | extern char *bind_address; | |
34937987 | 49 | extern char *sockopts; |
6e195fe9 | 50 | extern char *config_file; |
bf4679e8 | 51 | extern char *files_from; |
fed1f3f4 | 52 | extern char *tmpdir; |
730df9d2 WD |
53 | extern struct chmod_mode_struct *chmod_modes; |
54 | extern struct filter_list_struct server_filter_list; | |
6e195fe9 WD |
55 | |
56 | char *auth_user; | |
18638730 | 57 | int read_only = 0; |
f39b2060 WD |
58 | int daemon_log_format_has_i = 0; |
59 | int daemon_log_format_has_o_or_i = 0; | |
211bc43b | 60 | int module_id = -1; |
3591c066 | 61 | |
e7bf7c01 WD |
62 | /* Length of lp_path() string when in daemon mode & not chrooted, else 0. */ |
63 | unsigned int module_dirlen = 0; | |
64 | ||
be2961da | 65 | /** |
bc363ea9 | 66 | * Run a client connected to an rsyncd. The alternative to this |
be2961da MP |
67 | * function for remote-shell connections is do_cmd(). |
68 | * | |
fdf88d75 MP |
69 | * After negotiating which module to use and reading the server's |
70 | * motd, this hands over to client_run(). Telling the server the | |
71 | * module will cause it to chroot/setuid/etc. | |
72 | * | |
73 | * Instead of doing a transfer, the client may at this stage instead | |
74 | * get a listing of remote modules and exit. | |
be2961da MP |
75 | * |
76 | * @return -1 for error in startup, or the result of client_run(). | |
d0829892 | 77 | * Either way, it eventually gets passed to exit_cleanup(). |
be2961da | 78 | **/ |
3591c066 AT |
79 | int start_socket_client(char *host, char *path, int argc, char *argv[]) |
80 | { | |
68f40ebb | 81 | int fd, ret; |
2e94e70e | 82 | char *p, *user = NULL; |
4a7144ee | 83 | |
1732b6c0 WD |
84 | /* This is redundant with code in start_inband_exchange(), but this |
85 | * short-circuits a problem in the client before we open a socket, | |
86 | * and the extra check won't hurt. */ | |
f98df1d9 | 87 | if (*path == '/') { |
1732b6c0 WD |
88 | rprintf(FERROR, |
89 | "ERROR: The remote path must start with a module name not a /\n"); | |
f98df1d9 AT |
90 | return -1; |
91 | } | |
92 | ||
b31c92ed | 93 | if ((p = strrchr(host, '@')) != NULL) { |
bcb7e502 AT |
94 | user = host; |
95 | host = p+1; | |
1732b6c0 | 96 | *p = '\0'; |
bcb7e502 AT |
97 | } |
98 | ||
837cbad9 WD |
99 | fd = open_socket_out_wrapped(host, rsync_port, bind_address, |
100 | default_af_hint); | |
df5cd107 | 101 | if (fd == -1) |
65417579 | 102 | exit_cleanup(RERR_SOCKETIO); |
68f40ebb | 103 | |
34937987 WD |
104 | set_socket_options(fd, sockopts); |
105 | ||
68f40ebb WD |
106 | ret = start_inband_exchange(user, path, fd, fd, argc); |
107 | ||
180443af | 108 | return ret ? ret : client_run(fd, fd, -1, argc, argv); |
68f40ebb WD |
109 | } |
110 | ||
b9f592fb WD |
111 | int start_inband_exchange(char *user, char *path, int f_in, int f_out, |
112 | int argc) | |
68f40ebb WD |
113 | { |
114 | int i; | |
115 | char *sargs[MAX_ARGS]; | |
116 | int sargc = 0; | |
20accf4d | 117 | char line[BIGPATHBUFLEN]; |
68f40ebb | 118 | char *p; |
68f40ebb WD |
119 | |
120 | if (argc == 0 && !am_sender) | |
9bcb2595 | 121 | list_only |= 1; |
68f40ebb WD |
122 | |
123 | if (*path == '/') { | |
1732b6c0 WD |
124 | rprintf(FERROR, |
125 | "ERROR: The remote path must start with a module name\n"); | |
68f40ebb WD |
126 | return -1; |
127 | } | |
128 | ||
2e94e70e WD |
129 | if (!user) |
130 | user = getenv("USER"); | |
131 | if (!user) | |
132 | user = getenv("LOGNAME"); | |
68f40ebb | 133 | |
5a8543b8 | 134 | io_printf(f_out, "@RSYNCD: %d\n", protocol_version); |
91eee594 | 135 | |
2e94e70e | 136 | if (!read_line(f_in, line, sizeof line - 1)) { |
be2961da | 137 | rprintf(FERROR, "rsync: did not see server greeting\n"); |
3591c066 AT |
138 | return -1; |
139 | } | |
140 | ||
daa598df | 141 | if (sscanf(line,"@RSYNCD: %d", &remote_protocol) != 1) { |
be2961da MP |
142 | /* note that read_line strips of \n or \r */ |
143 | rprintf(FERROR, "rsync: server sent \"%s\" rather than greeting\n", | |
144 | line); | |
3591c066 AT |
145 | return -1; |
146 | } | |
daa598df WD |
147 | if (protocol_version > remote_protocol) |
148 | protocol_version = remote_protocol; | |
3591c066 | 149 | |
9bcb2595 WD |
150 | if (list_only && protocol_version >= 29) |
151 | list_only |= 2; | |
152 | ||
153 | /* set daemon_over_rsh to false since we need to build the | |
154 | * true set of args passed through the rsh/ssh connection; | |
155 | * this is a no-op for direct-socket-connection mode */ | |
156 | daemon_over_rsh = 0; | |
157 | server_options(sargs, &sargc); | |
158 | ||
159 | sargs[sargc++] = "."; | |
160 | ||
161 | if (path && *path) | |
162 | sargs[sargc++] = path; | |
163 | ||
164 | sargs[sargc] = NULL; | |
165 | ||
166 | if (verbose > 1) | |
167 | print_child_argv(sargs); | |
168 | ||
2c91d3d3 AT |
169 | p = strchr(path,'/'); |
170 | if (p) *p = 0; | |
68f40ebb | 171 | io_printf(f_out, "%s\n", path); |
2c91d3d3 AT |
172 | if (p) *p = '/'; |
173 | ||
063393d6 MP |
174 | /* Old servers may just drop the connection here, |
175 | rather than sending a proper EXIT command. Yuck. */ | |
8dad7fc6 | 176 | kluge_around_eof = list_only && protocol_version < 25 ? 1 : 0; |
7a55d06e | 177 | |
063393d6 | 178 | while (1) { |
2e94e70e | 179 | if (!read_line(f_in, line, sizeof line - 1)) { |
be2961da | 180 | rprintf(FERROR, "rsync: didn't get server startup line\n"); |
3591c066 AT |
181 | return -1; |
182 | } | |
31593dd6 | 183 | |
31593dd6 | 184 | if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) { |
68f40ebb | 185 | auth_client(f_out, user, line+18); |
31593dd6 AT |
186 | continue; |
187 | } | |
31593dd6 | 188 | |
2e94e70e WD |
189 | if (strcmp(line,"@RSYNCD: OK") == 0) |
190 | break; | |
8f04bb36 | 191 | |
cae95647 MP |
192 | if (strcmp(line,"@RSYNCD: EXIT") == 0) { |
193 | /* This is sent by recent versions of the | |
194 | * server to terminate the listing of modules. | |
195 | * We don't want to go on and transfer | |
196 | * anything; just exit. */ | |
197 | exit(0); | |
198 | } | |
8f04bb36 | 199 | |
136ac7ec | 200 | if (strncmp(line, "@ERROR", 6) == 0) { |
1732b6c0 | 201 | rprintf(FERROR, "%s\n", line); |
136ac7ec MP |
202 | /* This is always fatal; the server will now |
203 | * close the socket. */ | |
180443af | 204 | return -1; |
136ac7ec | 205 | } |
180443af WD |
206 | |
207 | rprintf(FINFO, "%s\n", line); | |
3591c066 | 208 | } |
8dad7fc6 | 209 | kluge_around_eof = 0; |
3591c066 | 210 | |
68f40ebb WD |
211 | for (i = 0; i < sargc; i++) { |
212 | io_printf(f_out, "%s\n", sargs[i]); | |
3591c066 | 213 | } |
68f40ebb | 214 | io_printf(f_out, "\n"); |
3591c066 | 215 | |
daa598df | 216 | if (protocol_version < 23) { |
3f55bd5d | 217 | if (protocol_version == 22 || !am_sender) |
da3478b2 | 218 | io_start_multiplex_in(); |
09b7f5db | 219 | } |
8d9dc9f9 | 220 | |
68f40ebb | 221 | return 0; |
3591c066 AT |
222 | } |
223 | ||
141c6265 WD |
224 | static char *finish_pre_exec(pid_t pid, int fd, char *request, |
225 | int argc, char *argv[]) | |
c95ca2a2 | 226 | { |
141c6265 | 227 | int j, status = -1; |
3591c066 | 228 | |
c95ca2a2 | 229 | if (request) { |
141c6265 WD |
230 | write_buf(fd, request, strlen(request)+1); |
231 | for (j = 0; j < argc; j++) | |
232 | write_buf(fd, argv[j], strlen(argv[j])+1); | |
c95ca2a2 | 233 | } |
141c6265 WD |
234 | |
235 | write_byte(fd, 0); | |
236 | ||
c95ca2a2 WD |
237 | close(fd); |
238 | ||
239 | if (wait_process(pid, &status, 0) < 0 | |
240 | || !WIFEXITED(status) || WEXITSTATUS(status) != 0) { | |
241 | char *e; | |
242 | if (asprintf(&e, "pre-xfer exec returned failure (%d)\n", status) < 0) | |
243 | out_of_memory("finish_pre_exec"); | |
244 | return e; | |
245 | } | |
246 | return NULL; | |
247 | } | |
3591c066 | 248 | |
141c6265 WD |
249 | static int read_arg_from_pipe(int fd, char *buf, int limit) |
250 | { | |
251 | char *bp = buf, *eob = buf + limit - 1; | |
252 | ||
253 | while (1) { | |
254 | if (read(fd, bp, 1) != 1) | |
255 | return -1; | |
256 | if (*bp == '\0') | |
257 | break; | |
258 | if (bp < eob) | |
259 | bp++; | |
260 | } | |
261 | *bp = '\0'; | |
262 | ||
263 | return bp - buf; | |
264 | } | |
265 | ||
68f40ebb | 266 | static int rsync_module(int f_in, int f_out, int i) |
3591c066 | 267 | { |
2e94e70e | 268 | int argc = 0; |
b7061c82 WD |
269 | int maxargs; |
270 | char **argv; | |
20accf4d | 271 | char line[BIGPATHBUFLEN]; |
2af27ad9 | 272 | uid_t uid = (uid_t)-2; /* canonically "nobody" */ |
1a016bfd | 273 | gid_t gid = (gid_t)-2; |
c95ca2a2 | 274 | char *p, *err_msg = NULL; |
09021eab DD |
275 | char *addr = client_addr(f_in); |
276 | char *host = client_name(f_in); | |
874895d5 | 277 | char *name = lp_name(i); |
8638dd48 | 278 | int use_chroot = lp_use_chroot(i); |
2e94e70e | 279 | int start_glob = 0; |
c95ca2a2 WD |
280 | int ret, pre_exec_fd = -1; |
281 | pid_t pre_exec_pid = 0; | |
2e94e70e | 282 | char *request = NULL; |
56c473b7 AT |
283 | |
284 | if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) { | |
1732b6c0 | 285 | rprintf(FLOG, "rsync denied on module %s from %s (%s)\n", |
31ec50d7 | 286 | name, host, addr); |
c0422cea WD |
287 | if (!lp_list(i)) |
288 | io_printf(f_out, "@ERROR: Unknown module '%s'\n", name); | |
289 | else { | |
290 | io_printf(f_out, | |
291 | "@ERROR: access denied to %s from %s (%s)\n", | |
292 | name, host, addr); | |
293 | } | |
56c473b7 AT |
294 | return -1; |
295 | } | |
3591c066 | 296 | |
68f40ebb | 297 | if (am_daemon && am_server) { |
9e5a5ddb | 298 | rprintf(FLOG, "rsync allowed access on module %s from %s (%s)\n", |
68f40ebb WD |
299 | name, host, addr); |
300 | } | |
301 | ||
5e71c444 | 302 | if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) { |
8d72ef6e | 303 | if (errno) { |
1732b6c0 | 304 | rsyserr(FLOG, errno, "failed to open lock file %s", |
45c49b52 | 305 | lp_lock_file(i)); |
4875d6b6 | 306 | io_printf(f_out, "@ERROR: failed to open lock file\n"); |
8d72ef6e | 307 | } else { |
1732b6c0 | 308 | rprintf(FLOG, "max connections (%d) reached\n", |
5e71c444 | 309 | lp_max_connections(i)); |
4ccfd96c | 310 | io_printf(f_out, "@ERROR: max connections (%d) reached -- try again later\n", |
837cbad9 | 311 | lp_max_connections(i)); |
8d72ef6e | 312 | } |
0c515f17 AT |
313 | return -1; |
314 | } | |
315 | ||
45c5b903 | 316 | auth_user = auth_server(f_in, f_out, i, host, addr, "@RSYNCD: AUTHREQD "); |
d0d56395 | 317 | |
97cb8dc2 | 318 | if (!auth_user) { |
68f40ebb | 319 | io_printf(f_out, "@ERROR: auth failed on module %s\n", name); |
4a7144ee | 320 | return -1; |
d0d56395 AT |
321 | } |
322 | ||
3591c066 AT |
323 | module_id = i; |
324 | ||
211bc43b | 325 | if (lp_read_only(i)) |
18638730 WD |
326 | read_only = 1; |
327 | ||
f39b2060 | 328 | if (lp_transfer_logging(i)) { |
624d6be2 | 329 | if (log_format_has(lp_log_format(i), 'i')) |
f39b2060 WD |
330 | daemon_log_format_has_i = 1; |
331 | if (daemon_log_format_has_i | |
624d6be2 | 332 | || log_format_has(lp_log_format(i), 'o')) |
f39b2060 WD |
333 | daemon_log_format_has_o_or_i = 1; |
334 | } | |
c0814b81 | 335 | |
6fe05820 | 336 | am_root = (MY_UID() == 0); |
8ef4ffd6 | 337 | |
716baed7 DD |
338 | if (am_root) { |
339 | p = lp_uid(i); | |
340 | if (!name_to_uid(p, &uid)) { | |
2e94e70e | 341 | if (!isdigit(*(unsigned char *)p)) { |
1732b6c0 | 342 | rprintf(FLOG, "Invalid uid %s\n", p); |
68f40ebb | 343 | io_printf(f_out, "@ERROR: invalid uid %s\n", p); |
716baed7 | 344 | return -1; |
4a7144ee | 345 | } |
716baed7 DD |
346 | uid = atoi(p); |
347 | } | |
348 | ||
349 | p = lp_gid(i); | |
350 | if (!name_to_gid(p, &gid)) { | |
2e94e70e | 351 | if (!isdigit(*(unsigned char *)p)) { |
1732b6c0 | 352 | rprintf(FLOG, "Invalid gid %s\n", p); |
68f40ebb | 353 | io_printf(f_out, "@ERROR: invalid gid %s\n", p); |
716baed7 | 354 | return -1; |
4a7144ee | 355 | } |
716baed7 DD |
356 | gid = atoi(p); |
357 | } | |
8ef4ffd6 | 358 | } |
3b2b5345 | 359 | |
4a7144ee WD |
360 | /* TODO: If we're not root, but the configuration requests |
361 | * that we change to some uid other than the current one, then | |
362 | * log a warning. */ | |
363 | ||
364 | /* TODO: Perhaps take a list of gids, and make them into the | |
365 | * supplementary groups. */ | |
8ef4ffd6 | 366 | |
46bffd98 | 367 | if (use_chroot || (module_dirlen = strlen(lp_path(i))) == 1) { |
e7bf7c01 | 368 | module_dirlen = 0; |
7842418b | 369 | set_filter_dir("/", 1); |
46bffd98 | 370 | } else |
7842418b | 371 | set_filter_dir(lp_path(i), module_dirlen); |
e7bf7c01 WD |
372 | |
373 | p = lp_filter(i); | |
ebfd1a1c | 374 | parse_rule(&server_filter_list, p, MATCHFLG_WORD_SPLIT, |
2c8c8bba | 375 | XFLG_ABS_IF_SLASH); |
837cbad9 | 376 | |
cd64343a | 377 | p = lp_include_from(i); |
ebfd1a1c | 378 | parse_filter_file(&server_filter_list, p, MATCHFLG_INCLUDE, |
2c8c8bba | 379 | XFLG_ABS_IF_SLASH | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS); |
cd64343a DD |
380 | |
381 | p = lp_include(i); | |
ebfd1a1c | 382 | parse_rule(&server_filter_list, p, |
0a68f869 | 383 | MATCHFLG_INCLUDE | MATCHFLG_WORD_SPLIT, |
2c8c8bba | 384 | XFLG_ABS_IF_SLASH | XFLG_OLD_PREFIXES); |
cd64343a | 385 | |
8f3a2d54 | 386 | p = lp_exclude_from(i); |
ebfd1a1c | 387 | parse_filter_file(&server_filter_list, p, 0, |
2c8c8bba | 388 | XFLG_ABS_IF_SLASH | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS); |
8f3a2d54 | 389 | |
5805327b | 390 | p = lp_exclude(i); |
ebfd1a1c | 391 | parse_rule(&server_filter_list, p, MATCHFLG_WORD_SPLIT, |
2c8c8bba | 392 | XFLG_ABS_IF_SLASH | XFLG_OLD_PREFIXES); |
8f3a2d54 | 393 | |
45a83540 | 394 | log_init(); |
1a016bfd | 395 | |
9d0d18b5 | 396 | #ifdef HAVE_PUTENV |
c95ca2a2 | 397 | if (*lp_prexfer_exec(i) || *lp_postxfer_exec(i)) { |
9d0d18b5 WD |
398 | char *modname, *modpath, *hostaddr, *hostname, *username; |
399 | int status; | |
400 | if (asprintf(&modname, "RSYNC_MODULE_NAME=%s", name) < 0 | |
401 | || asprintf(&modpath, "RSYNC_MODULE_PATH=%s", lp_path(i)) < 0 | |
402 | || asprintf(&hostaddr, "RSYNC_HOST_ADDR=%s", addr) < 0 | |
403 | || asprintf(&hostname, "RSYNC_HOST_NAME=%s", host) < 0 | |
404 | || asprintf(&username, "RSYNC_USER_NAME=%s", auth_user) < 0) | |
405 | out_of_memory("rsync_module"); | |
406 | putenv(modname); | |
407 | putenv(modpath); | |
408 | putenv(hostaddr); | |
409 | putenv(hostname); | |
410 | putenv(username); | |
411 | umask(orig_umask); | |
c95ca2a2 WD |
412 | /* For post-xfer exec, fork a new process to run the rsync |
413 | * daemon while this process waits for the exit status and | |
414 | * runs the indicated command at that point. */ | |
415 | if (*lp_postxfer_exec(i)) { | |
9d0d18b5 WD |
416 | pid_t pid = fork(); |
417 | if (pid < 0) { | |
418 | rsyserr(FLOG, errno, "fork failed"); | |
419 | io_printf(f_out, "@ERROR: fork failed\n"); | |
420 | return -1; | |
421 | } | |
422 | if (pid) { | |
423 | char *ret1, *ret2; | |
c95ca2a2 WD |
424 | if (wait_process(pid, &status, 0) < 0) |
425 | status = -1; | |
9d0d18b5 WD |
426 | if (asprintf(&ret1, "RSYNC_RAW_STATUS=%d", status) > 0) |
427 | putenv(ret1); | |
428 | if (WIFEXITED(status)) | |
429 | status = WEXITSTATUS(status); | |
430 | else | |
431 | status = -1; | |
432 | if (asprintf(&ret2, "RSYNC_EXIT_STATUS=%d", status) > 0) | |
433 | putenv(ret2); | |
c95ca2a2 | 434 | system(lp_postxfer_exec(i)); |
9d0d18b5 WD |
435 | _exit(status); |
436 | } | |
437 | } | |
c95ca2a2 WD |
438 | /* For pre-xfer exec, fork a child process to run the indicated |
439 | * command, though it first waits for the parent process to | |
440 | * send us the user's request via a pipe. */ | |
441 | if (*lp_prexfer_exec(i)) { | |
442 | int fds[2]; | |
443 | if (pipe(fds) < 0 || (pre_exec_pid = fork()) < 0) { | |
444 | rsyserr(FLOG, errno, "pre-xfer exec preparation failed"); | |
445 | io_printf(f_out, "@ERROR: pre-xfer exec preparation failed\n"); | |
446 | return -1; | |
447 | } | |
448 | if (pre_exec_pid == 0) { | |
141c6265 WD |
449 | char buf[BIGPATHBUFLEN]; |
450 | int j, len; | |
c95ca2a2 WD |
451 | close(fds[1]); |
452 | set_blocking(fds[0]); | |
141c6265 | 453 | len = read_arg_from_pipe(fds[0], buf, BIGPATHBUFLEN); |
c95ca2a2 WD |
454 | if (len <= 0) |
455 | _exit(1); | |
c95ca2a2 WD |
456 | if (asprintf(&p, "RSYNC_REQUEST=%s", buf) < 0) |
457 | out_of_memory("rsync_module"); | |
458 | putenv(p); | |
141c6265 WD |
459 | for (j = 0; ; j++) { |
460 | len = read_arg_from_pipe(fds[0], buf, | |
461 | BIGPATHBUFLEN); | |
462 | if (len <= 0) { | |
463 | if (!len) | |
464 | break; | |
465 | _exit(1); | |
466 | } | |
467 | if (asprintf(&p, "RSYNC_ARG%d=%s", j, buf) < 0) | |
468 | out_of_memory("rsync_module"); | |
469 | putenv(p); | |
470 | } | |
471 | close(fds[0]); | |
c95ca2a2 WD |
472 | close(STDIN_FILENO); |
473 | close(STDOUT_FILENO); | |
474 | status = system(lp_prexfer_exec(i)); | |
475 | if (!WIFEXITED(status)) | |
476 | _exit(1); | |
477 | _exit(WEXITSTATUS(status)); | |
478 | } | |
479 | close(fds[0]); | |
480 | set_blocking(fds[1]); | |
481 | pre_exec_fd = fds[1]; | |
482 | } | |
9d0d18b5 WD |
483 | umask(0); |
484 | } | |
485 | #endif | |
486 | ||
8638dd48 | 487 | if (use_chroot) { |
b52c1d9d MP |
488 | /* |
489 | * XXX: The 'use chroot' flag is a fairly reliable | |
490 | * source of confusion, because it fails under two | |
491 | * important circumstances: running as non-root, | |
492 | * running on Win32 (or possibly others). On the | |
493 | * other hand, if you are running as root, then it | |
494 | * might be better to always use chroot. | |
495 | * | |
496 | * So, perhaps if we can't chroot we should just issue | |
497 | * a warning, unless a "require chroot" flag is set, | |
498 | * in which case we fail. | |
499 | */ | |
8638dd48 | 500 | if (chroot(lp_path(i))) { |
4875d6b6 | 501 | rsyserr(FLOG, errno, "chroot %s failed", |
45c49b52 | 502 | lp_path(i)); |
68f40ebb | 503 | io_printf(f_out, "@ERROR: chroot failed\n"); |
8638dd48 DD |
504 | return -1; |
505 | } | |
3591c066 | 506 | |
59187666 | 507 | if (!push_dir("/")) { |
4875d6b6 | 508 | rsyserr(FLOG, errno, "chdir %s failed\n", |
45c49b52 | 509 | lp_path(i)); |
68f40ebb | 510 | io_printf(f_out, "@ERROR: chdir failed\n"); |
8638dd48 DD |
511 | return -1; |
512 | } | |
3591c066 | 513 | |
716baed7 | 514 | } else { |
59187666 | 515 | if (!push_dir(lp_path(i))) { |
4875d6b6 | 516 | rsyserr(FLOG, errno, "chdir %s failed\n", |
45c49b52 | 517 | lp_path(i)); |
68f40ebb | 518 | io_printf(f_out, "@ERROR: chdir failed\n"); |
716baed7 DD |
519 | return -1; |
520 | } | |
cb13abfe | 521 | sanitize_paths = 1; |
716baed7 DD |
522 | } |
523 | ||
524 | if (am_root) { | |
715d1f45 MP |
525 | /* XXXX: You could argue that if the daemon is started |
526 | * by a non-root user and they explicitly specify a | |
527 | * gid, then we should try to change to that gid -- | |
528 | * this could be possible if it's already in their | |
529 | * supplementary groups. */ | |
530 | ||
531 | /* TODO: Perhaps we need to document that if rsyncd is | |
532 | * started by somebody other than root it will inherit | |
533 | * all their supplementary groups. */ | |
534 | ||
716baed7 | 535 | if (setgid(gid)) { |
1732b6c0 | 536 | rsyserr(FLOG, errno, "setgid %d failed", (int)gid); |
68f40ebb | 537 | io_printf(f_out, "@ERROR: setgid failed\n"); |
8638dd48 DD |
538 | return -1; |
539 | } | |
4f5b0756 | 540 | #ifdef HAVE_SETGROUPS |
6969ebcf WD |
541 | /* Get rid of any supplementary groups this process |
542 | * might have inheristed. */ | |
543 | if (setgroups(1, &gid)) { | |
1732b6c0 | 544 | rsyserr(FLOG, errno, "setgroups failed"); |
6969ebcf WD |
545 | io_printf(f_out, "@ERROR: setgroups failed\n"); |
546 | return -1; | |
547 | } | |
548 | #endif | |
3591c066 | 549 | |
716baed7 | 550 | if (setuid(uid)) { |
1732b6c0 | 551 | rsyserr(FLOG, errno, "setuid %d failed", (int)uid); |
68f40ebb | 552 | io_printf(f_out, "@ERROR: setuid failed\n"); |
8638dd48 DD |
553 | return -1; |
554 | } | |
555 | ||
6fe05820 | 556 | am_root = (MY_UID() == 0); |
3591c066 AT |
557 | } |
558 | ||
fed1f3f4 WD |
559 | if (lp_temp_dir(i) && *lp_temp_dir(i)) { |
560 | tmpdir = lp_temp_dir(i); | |
561 | if (strlen(tmpdir) >= MAXPATHLEN - 10) { | |
562 | rprintf(FLOG, | |
563 | "the 'temp dir' value for %s is WAY too long -- ignoring.\n", | |
564 | name); | |
565 | tmpdir = NULL; | |
566 | } | |
567 | } | |
568 | ||
68f40ebb | 569 | io_printf(f_out, "@RSYNCD: OK\n"); |
3591c066 | 570 | |
b7061c82 WD |
571 | maxargs = MAX_ARGS; |
572 | if (!(argv = new_array(char *, maxargs))) | |
573 | out_of_memory("rsync_module"); | |
3591c066 AT |
574 | argv[argc++] = "rsyncd"; |
575 | ||
576 | while (1) { | |
2e94e70e | 577 | if (!read_line(f_in, line, sizeof line - 1)) |
3591c066 | 578 | return -1; |
3591c066 | 579 | |
2e94e70e WD |
580 | if (!*line) |
581 | break; | |
3591c066 | 582 | |
874895d5 AT |
583 | p = line; |
584 | ||
b7061c82 WD |
585 | if (argc == maxargs) { |
586 | maxargs += MAX_ARGS; | |
587 | if (!(argv = realloc_array(argv, char *, maxargs))) | |
588 | out_of_memory("rsync_module"); | |
589 | } | |
2e94e70e | 590 | if (!(argv[argc] = strdup(p))) |
b7061c82 | 591 | out_of_memory("rsync_module"); |
3591c066 | 592 | |
20accf4d WD |
593 | switch (start_glob) { |
594 | case 0: | |
874895d5 | 595 | argc++; |
20accf4d WD |
596 | if (strcmp(line, ".") == 0) |
597 | start_glob = 1; | |
598 | break; | |
599 | case 1: | |
c95ca2a2 WD |
600 | if (pre_exec_pid) { |
601 | err_msg = finish_pre_exec(pre_exec_pid, | |
141c6265 WD |
602 | pre_exec_fd, p, |
603 | argc, argv); | |
c95ca2a2 WD |
604 | pre_exec_pid = 0; |
605 | } | |
20accf4d WD |
606 | request = strdup(p); |
607 | start_glob = 2; | |
608 | /* FALL THROUGH */ | |
609 | default: | |
c95ca2a2 WD |
610 | if (!err_msg) |
611 | glob_expand(name, &argv, &argc, &maxargs); | |
20accf4d WD |
612 | break; |
613 | } | |
3591c066 AT |
614 | } |
615 | ||
141c6265 WD |
616 | if (pre_exec_pid) { |
617 | err_msg = finish_pre_exec(pre_exec_pid, pre_exec_fd, request, | |
618 | argc, argv); | |
619 | } | |
c95ca2a2 | 620 | |
18638730 | 621 | verbose = 0; /* future verbosity is controlled by client options */ |
c9dc1300 | 622 | ret = parse_arguments(&argc, (const char ***) &argv, 0); |
7a6653bc | 623 | quiet = 0; /* Don't let someone try to be tricky. */ |
3591c066 | 624 | |
7c2a9e76 WD |
625 | if (filesfrom_fd == 0) |
626 | filesfrom_fd = f_in; | |
627 | ||
7b372642 | 628 | if (request) { |
97cb8dc2 | 629 | if (*auth_user) { |
9e5a5ddb WD |
630 | rprintf(FLOG, "rsync %s %s from %s@%s (%s)\n", |
631 | am_sender ? "on" : "to", | |
97cb8dc2 | 632 | request, auth_user, host, addr); |
d0d56395 | 633 | } else { |
9e5a5ddb WD |
634 | rprintf(FLOG, "rsync %s %s from %s (%s)\n", |
635 | am_sender ? "on" : "to", | |
d0d56395 AT |
636 | request, host, addr); |
637 | } | |
7b372642 AT |
638 | free(request); |
639 | } | |
640 | ||
15b7b73d | 641 | #ifndef DEBUG |
3591c066 | 642 | /* don't allow the logs to be flooded too fast */ |
59b0e7a8 WD |
643 | if (verbose > lp_max_verbosity(i)) |
644 | verbose = lp_max_verbosity(i); | |
0199b05f | 645 | #endif |
3591c066 | 646 | |
1732b6c0 WD |
647 | if (protocol_version < 23 |
648 | && (protocol_version == 22 || am_sender)) | |
da3478b2 | 649 | io_start_multiplex_out(); |
c95ca2a2 | 650 | else if (!ret || err_msg) { |
1732b6c0 WD |
651 | /* We have to get I/O multiplexing started so that we can |
652 | * get the error back to the client. This means getting | |
653 | * the protocol setup finished first in later versions. */ | |
654 | setup_protocol(f_out, f_in); | |
b03c719f WD |
655 | if (!am_sender) { |
656 | /* Since we failed in our option parsing, we may not | |
657 | * have finished parsing that the client sent us a | |
658 | * --files-from option, so look for it manually. | |
659 | * Without this, the socket would be in the wrong | |
660 | * state for the upcoming error message. */ | |
661 | if (!files_from) { | |
662 | int i; | |
663 | for (i = 0; i < argc; i++) { | |
664 | if (strncmp(argv[i], "--files-from", 12) == 0) { | |
665 | files_from = ""; | |
666 | break; | |
667 | } | |
668 | } | |
669 | } | |
670 | if (files_from) | |
671 | write_byte(f_out, 0); | |
672 | } | |
da3478b2 | 673 | io_start_multiplex_out(); |
554e0a8d | 674 | } |
15b7b73d | 675 | |
c95ca2a2 WD |
676 | if (!ret || err_msg) { |
677 | if (err_msg) | |
678 | rprintf(FERROR, err_msg); | |
679 | else | |
680 | option_error(); | |
7e561438 | 681 | msleep(400); |
4a7144ee | 682 | exit_cleanup(RERR_UNSUPPORTED); |
41979ff8 AT |
683 | } |
684 | ||
3e6ddb37 WD |
685 | if (lp_timeout(i) && lp_timeout(i) > io_timeout) |
686 | set_io_timeout(lp_timeout(i)); | |
81791cfc | 687 | |
730df9d2 | 688 | |
aaccaa88 WD |
689 | if (am_sender) |
690 | p = lp_outgoing_chmod(i); | |
691 | else | |
692 | p = lp_incoming_chmod(i); | |
693 | if (*p && !parse_chmod(p, &chmod_modes)) { | |
694 | rprintf(FLOG, "Invalid \"%sing chmod\" directive: %s\n", | |
695 | am_sender ? "outgo" : "incom", p); | |
696 | } | |
730df9d2 | 697 | |
c9dc1300 | 698 | start_server(f_in, f_out, argc, argv); |
3591c066 AT |
699 | |
700 | return 0; | |
701 | } | |
702 | ||
7a6421fa AT |
703 | /* send a list of available modules to the client. Don't list those |
704 | with "list = False". */ | |
3591c066 AT |
705 | static void send_listing(int fd) |
706 | { | |
707 | int n = lp_numservices(); | |
708 | int i; | |
063393d6 | 709 | |
c0422cea | 710 | for (i = 0; i < n; i++) { |
3591c066 | 711 | if (lp_list(i)) |
4a7144ee | 712 | io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i)); |
c0422cea | 713 | } |
8f04bb36 | 714 | |
daa598df | 715 | if (protocol_version >= 25) |
063393d6 | 716 | io_printf(fd,"@RSYNCD: EXIT\n"); |
3591c066 AT |
717 | } |
718 | ||
68f40ebb | 719 | /* this is called when a connection is established to a client |
3591c066 AT |
720 | and we want to start talking. The setup of the system is done from |
721 | here */ | |
68f40ebb | 722 | int start_daemon(int f_in, int f_out) |
3591c066 | 723 | { |
20accf4d | 724 | char line[1024]; |
3591c066 | 725 | char *motd; |
c0422cea | 726 | int i; |
4cdf25e4 | 727 | |
da3478b2 WD |
728 | io_set_sock_fds(f_in, f_out); |
729 | ||
2e94e70e | 730 | if (!lp_load(config_file, 0)) |
65417579 | 731 | exit_cleanup(RERR_SYNTAX); |
3591c066 | 732 | |
30e8c8e1 DD |
733 | log_init(); |
734 | ||
68f40ebb WD |
735 | if (!am_server) { |
736 | set_socket_options(f_in, "SO_KEEPALIVE"); | |
34937987 WD |
737 | if (sockopts) |
738 | set_socket_options(f_in, sockopts); | |
739 | else | |
740 | set_socket_options(f_in, lp_socket_options()); | |
68f40ebb WD |
741 | set_nonblocking(f_in); |
742 | } | |
3591c066 | 743 | |
5a8543b8 | 744 | io_printf(f_out, "@RSYNCD: %d\n", protocol_version); |
3591c066 AT |
745 | |
746 | motd = lp_motd_file(); | |
27d3cdbc | 747 | if (motd && *motd) { |
0090cbdb | 748 | FILE *f = fopen(motd,"r"); |
3591c066 | 749 | while (f && !feof(f)) { |
2e94e70e | 750 | int len = fread(line, 1, sizeof line - 1, f); |
3591c066 AT |
751 | if (len > 0) { |
752 | line[len] = 0; | |
68f40ebb | 753 | io_printf(f_out, "%s", line); |
3591c066 AT |
754 | } |
755 | } | |
2e94e70e WD |
756 | if (f) |
757 | fclose(f); | |
68f40ebb | 758 | io_printf(f_out, "\n"); |
3591c066 AT |
759 | } |
760 | ||
2e94e70e | 761 | if (!read_line(f_in, line, sizeof line - 1)) |
91eee594 | 762 | return -1; |
91eee594 | 763 | |
daa598df | 764 | if (sscanf(line,"@RSYNCD: %d", &remote_protocol) != 1) { |
68f40ebb | 765 | io_printf(f_out, "@ERROR: protocol startup error\n"); |
91eee594 | 766 | return -1; |
4a7144ee | 767 | } |
daa598df WD |
768 | if (protocol_version > remote_protocol) |
769 | protocol_version = remote_protocol; | |
91eee594 | 770 | |
c0422cea WD |
771 | line[0] = 0; |
772 | if (!read_line(f_in, line, sizeof line - 1)) | |
773 | return -1; | |
3591c066 | 774 | |
c0422cea WD |
775 | if (!*line || strcmp(line, "#list") == 0) { |
776 | send_listing(f_out); | |
777 | return -1; | |
778 | } | |
3591c066 | 779 | |
c0422cea WD |
780 | if (*line == '#') { |
781 | /* it's some sort of command that I don't understand */ | |
782 | io_printf(f_out, "@ERROR: Unknown command '%s'\n", line); | |
783 | return -1; | |
784 | } | |
3591c066 | 785 | |
c0422cea WD |
786 | if ((i = lp_number(line)) < 0) { |
787 | char *addr = client_addr(f_in); | |
788 | char *host = client_name(f_in); | |
789 | rprintf(FLOG, "unknown module '%s' tried from %s (%s)\n", | |
790 | line, host, addr); | |
791 | io_printf(f_out, "@ERROR: Unknown module '%s'\n", line); | |
792 | return -1; | |
3591c066 AT |
793 | } |
794 | ||
68f40ebb | 795 | return rsync_module(f_in, f_out, i); |
3591c066 AT |
796 | } |
797 | ||
3591c066 AT |
798 | int daemon_main(void) |
799 | { | |
8638dd48 | 800 | char *pid_file; |
1a016bfd | 801 | |
3591c066 | 802 | if (is_a_socket(STDIN_FILENO)) { |
41979ff8 AT |
803 | int i; |
804 | ||
805 | /* we are running via inetd - close off stdout and | |
4a7144ee WD |
806 | * stderr so that library functions (and getopt) don't |
807 | * try to use them. Redirect them to /dev/null */ | |
2e94e70e | 808 | for (i = 1; i < 3; i++) { |
4a7144ee | 809 | close(i); |
41979ff8 AT |
810 | open("/dev/null", O_RDWR); |
811 | } | |
3eb38818 | 812 | |
68f40ebb | 813 | return start_daemon(STDIN_FILENO, STDIN_FILENO); |
3591c066 AT |
814 | } |
815 | ||
13e29995 | 816 | if (!no_detach) |
4a7144ee | 817 | become_daemon(); |
3591c066 | 818 | |
2e94e70e | 819 | if (!lp_load(config_file, 1)) |
65417579 | 820 | exit_cleanup(RERR_SYNTAX); |
f9e940ef | 821 | |
0c56b1ad WD |
822 | if (rsync_port == 0 && (rsync_port = lp_rsync_port()) == 0) |
823 | rsync_port = RSYNC_PORT; | |
3dfe6e97 | 824 | if (bind_address == NULL && *lp_bind_address()) |
986aaaaa | 825 | bind_address = lp_bind_address(); |
0c56b1ad | 826 | |
45a83540 | 827 | log_init(); |
f9e940ef | 828 | |
9e5a5ddb | 829 | rprintf(FLOG, "rsyncd version %s starting, listening on port %d\n", |
4a7144ee WD |
830 | RSYNC_VERSION, rsync_port); |
831 | /* TODO: If listening on a particular address, then show that | |
832 | * address too. In fact, why not just do inet_ntop on the | |
833 | * local address??? */ | |
e42c9458 | 834 | |
8638dd48 | 835 | if (((pid_file = lp_pid_file()) != NULL) && (*pid_file != '\0')) { |
ad517ce5 DD |
836 | char pidbuf[16]; |
837 | int fd; | |
05b7bab8 | 838 | pid_t pid = getpid(); |
8638dd48 | 839 | cleanup_set_pid(pid); |
ad517ce5 DD |
840 | if ((fd = do_open(lp_pid_file(), O_WRONLY|O_CREAT|O_TRUNC, |
841 | 0666 & ~orig_umask)) == -1) { | |
4a7144ee | 842 | cleanup_set_pid(0); |
4875d6b6 | 843 | rsyserr(FLOG, errno, "failed to create pid file %s", |
45c49b52 | 844 | pid_file); |
4a7144ee | 845 | exit_cleanup(RERR_FILEIO); |
8638dd48 | 846 | } |
05b7bab8 | 847 | snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid); |
ad517ce5 DD |
848 | write(fd, pidbuf, strlen(pidbuf)); |
849 | close(fd); | |
8638dd48 DD |
850 | } |
851 | ||
8ef4ffd6 AT |
852 | start_accept_loop(rsync_port, start_daemon); |
853 | return -1; | |
3591c066 | 854 | } |