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 |
ba2133d6 WD |
9 | * it under the terms of the GNU General Public License version 2 as |
10 | * published by the Free Software Foundation. | |
4a7144ee | 11 | * |
a254fd97 MP |
12 | * This program is distributed in the hope that it will be useful, |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
4a7144ee | 16 | * |
e7c67065 WD |
17 | * You should have received a copy of the GNU General Public License along |
18 | * with this program; if not, write to the Free Software Foundation, Inc., | |
19 | * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. | |
a254fd97 | 20 | */ |
3591c066 | 21 | |
3591c066 AT |
22 | #include "rsync.h" |
23 | ||
c0814b81 | 24 | extern int verbose; |
7a6653bc | 25 | extern int quiet; |
9ce7fc38 | 26 | extern int output_motd; |
c0814b81 | 27 | extern int list_only; |
6e195fe9 WD |
28 | extern int am_sender; |
29 | extern int am_server; | |
30 | extern int am_daemon; | |
31 | extern int am_root; | |
3591c066 | 32 | extern int rsync_port; |
3162ea6f | 33 | extern int ignore_errors; |
8dad7fc6 | 34 | extern int kluge_around_eof; |
6e195fe9 | 35 | extern int daemon_over_rsh; |
b35d0d8e | 36 | extern int sanitize_paths; |
7c2a9e76 | 37 | extern int filesfrom_fd; |
daa598df WD |
38 | extern int remote_protocol; |
39 | extern int protocol_version; | |
6e195fe9 | 40 | extern int io_timeout; |
6e195fe9 WD |
41 | extern int no_detach; |
42 | extern int default_af_hint; | |
ecc7623e WD |
43 | extern int logfile_format_has_i; |
44 | extern int logfile_format_has_o_or_i; | |
c5b7aa15 | 45 | extern mode_t orig_umask; |
6e195fe9 | 46 | extern char *bind_address; |
34937987 | 47 | extern char *sockopts; |
6e195fe9 | 48 | extern char *config_file; |
ecc7623e | 49 | extern char *logfile_format; |
bf4679e8 | 50 | extern char *files_from; |
fed1f3f4 | 51 | extern char *tmpdir; |
730df9d2 WD |
52 | extern struct chmod_mode_struct *chmod_modes; |
53 | extern struct filter_list_struct server_filter_list; | |
6e195fe9 WD |
54 | |
55 | char *auth_user; | |
18638730 | 56 | int read_only = 0; |
211bc43b | 57 | int module_id = -1; |
8840ec0f | 58 | struct chmod_mode_struct *daemon_chmod_modes; |
3591c066 | 59 | |
e7bf7c01 WD |
60 | /* Length of lp_path() string when in daemon mode & not chrooted, else 0. */ |
61 | unsigned int module_dirlen = 0; | |
62 | ||
d749eb68 WD |
63 | #ifdef HAVE_SIGACTION |
64 | static struct sigaction sigact; | |
65 | #endif | |
66 | ||
be2961da | 67 | /** |
bc363ea9 | 68 | * Run a client connected to an rsyncd. The alternative to this |
be2961da MP |
69 | * function for remote-shell connections is do_cmd(). |
70 | * | |
fdf88d75 MP |
71 | * After negotiating which module to use and reading the server's |
72 | * motd, this hands over to client_run(). Telling the server the | |
73 | * module will cause it to chroot/setuid/etc. | |
74 | * | |
75 | * Instead of doing a transfer, the client may at this stage instead | |
76 | * get a listing of remote modules and exit. | |
be2961da MP |
77 | * |
78 | * @return -1 for error in startup, or the result of client_run(). | |
d0829892 | 79 | * Either way, it eventually gets passed to exit_cleanup(). |
be2961da | 80 | **/ |
3591c066 AT |
81 | int start_socket_client(char *host, char *path, int argc, char *argv[]) |
82 | { | |
68f40ebb | 83 | int fd, ret; |
2e94e70e | 84 | char *p, *user = NULL; |
4a7144ee | 85 | |
1732b6c0 WD |
86 | /* This is redundant with code in start_inband_exchange(), but this |
87 | * short-circuits a problem in the client before we open a socket, | |
88 | * and the extra check won't hurt. */ | |
f98df1d9 | 89 | if (*path == '/') { |
1732b6c0 WD |
90 | rprintf(FERROR, |
91 | "ERROR: The remote path must start with a module name not a /\n"); | |
f98df1d9 AT |
92 | return -1; |
93 | } | |
94 | ||
b31c92ed | 95 | if ((p = strrchr(host, '@')) != NULL) { |
bcb7e502 AT |
96 | user = host; |
97 | host = p+1; | |
1732b6c0 | 98 | *p = '\0'; |
bcb7e502 AT |
99 | } |
100 | ||
837cbad9 WD |
101 | fd = open_socket_out_wrapped(host, rsync_port, bind_address, |
102 | default_af_hint); | |
df5cd107 | 103 | if (fd == -1) |
65417579 | 104 | exit_cleanup(RERR_SOCKETIO); |
68f40ebb | 105 | |
34937987 WD |
106 | set_socket_options(fd, sockopts); |
107 | ||
68f40ebb WD |
108 | ret = start_inband_exchange(user, path, fd, fd, argc); |
109 | ||
180443af | 110 | return ret ? ret : client_run(fd, fd, -1, argc, argv); |
68f40ebb WD |
111 | } |
112 | ||
4a19c3b2 | 113 | int start_inband_exchange(const char *user, char *path, int f_in, int f_out, |
b9f592fb | 114 | int argc) |
68f40ebb WD |
115 | { |
116 | int i; | |
117 | char *sargs[MAX_ARGS]; | |
118 | int sargc = 0; | |
20accf4d | 119 | char line[BIGPATHBUFLEN]; |
68f40ebb | 120 | char *p; |
68f40ebb WD |
121 | |
122 | if (argc == 0 && !am_sender) | |
9bcb2595 | 123 | list_only |= 1; |
68f40ebb WD |
124 | |
125 | if (*path == '/') { | |
1732b6c0 WD |
126 | rprintf(FERROR, |
127 | "ERROR: The remote path must start with a module name\n"); | |
68f40ebb WD |
128 | return -1; |
129 | } | |
130 | ||
2e94e70e WD |
131 | if (!user) |
132 | user = getenv("USER"); | |
133 | if (!user) | |
134 | user = getenv("LOGNAME"); | |
68f40ebb | 135 | |
5a8543b8 | 136 | io_printf(f_out, "@RSYNCD: %d\n", protocol_version); |
91eee594 | 137 | |
2e94e70e | 138 | if (!read_line(f_in, line, sizeof line - 1)) { |
be2961da | 139 | rprintf(FERROR, "rsync: did not see server greeting\n"); |
3591c066 AT |
140 | return -1; |
141 | } | |
142 | ||
daa598df | 143 | if (sscanf(line,"@RSYNCD: %d", &remote_protocol) != 1) { |
be2961da MP |
144 | /* note that read_line strips of \n or \r */ |
145 | rprintf(FERROR, "rsync: server sent \"%s\" rather than greeting\n", | |
146 | line); | |
3591c066 AT |
147 | return -1; |
148 | } | |
daa598df WD |
149 | if (protocol_version > remote_protocol) |
150 | protocol_version = remote_protocol; | |
3591c066 | 151 | |
9bcb2595 WD |
152 | if (list_only && protocol_version >= 29) |
153 | list_only |= 2; | |
154 | ||
155 | /* set daemon_over_rsh to false since we need to build the | |
156 | * true set of args passed through the rsh/ssh connection; | |
157 | * this is a no-op for direct-socket-connection mode */ | |
158 | daemon_over_rsh = 0; | |
159 | server_options(sargs, &sargc); | |
160 | ||
161 | sargs[sargc++] = "."; | |
162 | ||
163 | if (path && *path) | |
164 | sargs[sargc++] = path; | |
165 | ||
166 | sargs[sargc] = NULL; | |
167 | ||
168 | if (verbose > 1) | |
169 | print_child_argv(sargs); | |
170 | ||
2c91d3d3 AT |
171 | p = strchr(path,'/'); |
172 | if (p) *p = 0; | |
68f40ebb | 173 | io_printf(f_out, "%s\n", path); |
2c91d3d3 AT |
174 | if (p) *p = '/'; |
175 | ||
063393d6 MP |
176 | /* Old servers may just drop the connection here, |
177 | rather than sending a proper EXIT command. Yuck. */ | |
8dad7fc6 | 178 | kluge_around_eof = list_only && protocol_version < 25 ? 1 : 0; |
7a55d06e | 179 | |
063393d6 | 180 | while (1) { |
2e94e70e | 181 | if (!read_line(f_in, line, sizeof line - 1)) { |
be2961da | 182 | rprintf(FERROR, "rsync: didn't get server startup line\n"); |
3591c066 AT |
183 | return -1; |
184 | } | |
31593dd6 | 185 | |
31593dd6 | 186 | if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) { |
68f40ebb | 187 | auth_client(f_out, user, line+18); |
31593dd6 AT |
188 | continue; |
189 | } | |
31593dd6 | 190 | |
2e94e70e WD |
191 | if (strcmp(line,"@RSYNCD: OK") == 0) |
192 | break; | |
8f04bb36 | 193 | |
cae95647 MP |
194 | if (strcmp(line,"@RSYNCD: EXIT") == 0) { |
195 | /* This is sent by recent versions of the | |
196 | * server to terminate the listing of modules. | |
197 | * We don't want to go on and transfer | |
198 | * anything; just exit. */ | |
199 | exit(0); | |
200 | } | |
8f04bb36 | 201 | |
136ac7ec | 202 | if (strncmp(line, "@ERROR", 6) == 0) { |
1732b6c0 | 203 | rprintf(FERROR, "%s\n", line); |
136ac7ec MP |
204 | /* This is always fatal; the server will now |
205 | * close the socket. */ | |
180443af | 206 | return -1; |
136ac7ec | 207 | } |
180443af | 208 | |
9ce7fc38 WD |
209 | /* This might be a MOTD line or a module listing, but there is |
210 | * no way to differentiate it. The manpage mentions this. */ | |
211 | if (output_motd) | |
212 | rprintf(FINFO, "%s\n", line); | |
3591c066 | 213 | } |
8dad7fc6 | 214 | kluge_around_eof = 0; |
3591c066 | 215 | |
68f40ebb WD |
216 | for (i = 0; i < sargc; i++) { |
217 | io_printf(f_out, "%s\n", sargs[i]); | |
3591c066 | 218 | } |
68f40ebb | 219 | io_printf(f_out, "\n"); |
3591c066 | 220 | |
daa598df | 221 | if (protocol_version < 23) { |
3f55bd5d | 222 | if (protocol_version == 22 || !am_sender) |
da3478b2 | 223 | io_start_multiplex_in(); |
09b7f5db | 224 | } |
8d9dc9f9 | 225 | |
68f40ebb | 226 | return 0; |
3591c066 AT |
227 | } |
228 | ||
141c6265 WD |
229 | static char *finish_pre_exec(pid_t pid, int fd, char *request, |
230 | int argc, char *argv[]) | |
c95ca2a2 | 231 | { |
141c6265 | 232 | int j, status = -1; |
3591c066 | 233 | |
c95ca2a2 | 234 | if (request) { |
141c6265 WD |
235 | write_buf(fd, request, strlen(request)+1); |
236 | for (j = 0; j < argc; j++) | |
237 | write_buf(fd, argv[j], strlen(argv[j])+1); | |
c95ca2a2 | 238 | } |
141c6265 WD |
239 | |
240 | write_byte(fd, 0); | |
241 | ||
c95ca2a2 WD |
242 | close(fd); |
243 | ||
244 | if (wait_process(pid, &status, 0) < 0 | |
245 | || !WIFEXITED(status) || WEXITSTATUS(status) != 0) { | |
246 | char *e; | |
d0236360 WD |
247 | if (asprintf(&e, "pre-xfer exec returned failure (%d)%s%s\n", |
248 | status, status < 0 ? ": " : "", | |
249 | status < 0 ? strerror(errno) : "") < 0) | |
c95ca2a2 WD |
250 | out_of_memory("finish_pre_exec"); |
251 | return e; | |
252 | } | |
253 | return NULL; | |
254 | } | |
3591c066 | 255 | |
141c6265 WD |
256 | static int read_arg_from_pipe(int fd, char *buf, int limit) |
257 | { | |
258 | char *bp = buf, *eob = buf + limit - 1; | |
259 | ||
260 | while (1) { | |
261 | if (read(fd, bp, 1) != 1) | |
262 | return -1; | |
263 | if (*bp == '\0') | |
264 | break; | |
265 | if (bp < eob) | |
266 | bp++; | |
267 | } | |
268 | *bp = '\0'; | |
269 | ||
270 | return bp - buf; | |
271 | } | |
272 | ||
439a198d | 273 | static int rsync_module(int f_in, int f_out, int i, char *addr, char *host) |
3591c066 | 274 | { |
2e94e70e | 275 | int argc = 0; |
b7061c82 WD |
276 | int maxargs; |
277 | char **argv; | |
20accf4d | 278 | char line[BIGPATHBUFLEN]; |
2af27ad9 | 279 | uid_t uid = (uid_t)-2; /* canonically "nobody" */ |
1a016bfd | 280 | gid_t gid = (gid_t)-2; |
c95ca2a2 | 281 | char *p, *err_msg = NULL; |
874895d5 | 282 | char *name = lp_name(i); |
8638dd48 | 283 | int use_chroot = lp_use_chroot(i); |
2e94e70e | 284 | int start_glob = 0; |
c95ca2a2 WD |
285 | int ret, pre_exec_fd = -1; |
286 | pid_t pre_exec_pid = 0; | |
2e94e70e | 287 | char *request = NULL; |
56c473b7 AT |
288 | |
289 | if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) { | |
1732b6c0 | 290 | rprintf(FLOG, "rsync denied on module %s from %s (%s)\n", |
31ec50d7 | 291 | name, host, addr); |
c0422cea WD |
292 | if (!lp_list(i)) |
293 | io_printf(f_out, "@ERROR: Unknown module '%s'\n", name); | |
294 | else { | |
295 | io_printf(f_out, | |
296 | "@ERROR: access denied to %s from %s (%s)\n", | |
297 | name, host, addr); | |
298 | } | |
56c473b7 AT |
299 | return -1; |
300 | } | |
3591c066 | 301 | |
68f40ebb | 302 | if (am_daemon && am_server) { |
9e5a5ddb | 303 | rprintf(FLOG, "rsync allowed access on module %s from %s (%s)\n", |
68f40ebb WD |
304 | name, host, addr); |
305 | } | |
306 | ||
5e71c444 | 307 | if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) { |
8d72ef6e | 308 | if (errno) { |
1732b6c0 | 309 | rsyserr(FLOG, errno, "failed to open lock file %s", |
45c49b52 | 310 | lp_lock_file(i)); |
4875d6b6 | 311 | io_printf(f_out, "@ERROR: failed to open lock file\n"); |
8d72ef6e | 312 | } else { |
1732b6c0 | 313 | rprintf(FLOG, "max connections (%d) reached\n", |
5e71c444 | 314 | lp_max_connections(i)); |
4ccfd96c | 315 | io_printf(f_out, "@ERROR: max connections (%d) reached -- try again later\n", |
837cbad9 | 316 | lp_max_connections(i)); |
8d72ef6e | 317 | } |
0c515f17 AT |
318 | return -1; |
319 | } | |
320 | ||
45c5b903 | 321 | auth_user = auth_server(f_in, f_out, i, host, addr, "@RSYNCD: AUTHREQD "); |
d0d56395 | 322 | |
97cb8dc2 | 323 | if (!auth_user) { |
68f40ebb | 324 | io_printf(f_out, "@ERROR: auth failed on module %s\n", name); |
4a7144ee | 325 | return -1; |
d0d56395 AT |
326 | } |
327 | ||
3591c066 AT |
328 | module_id = i; |
329 | ||
211bc43b | 330 | if (lp_read_only(i)) |
18638730 WD |
331 | read_only = 1; |
332 | ||
10ae3406 | 333 | if (lp_transfer_logging(i) && !logfile_format) |
ecc7623e | 334 | logfile_format = lp_log_format(i); |
10ae3406 WD |
335 | if (log_format_has(logfile_format, 'i')) |
336 | logfile_format_has_i = 1; | |
337 | if (logfile_format_has_i || log_format_has(logfile_format, 'o')) | |
338 | logfile_format_has_o_or_i = 1; | |
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)) { | |
2dc7b8bd | 345 | if (!isDigit(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)) { | |
2dc7b8bd | 355 | if (!isDigit(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 | |
6dc9b74b | 398 | log_init(1); |
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) { | |
503114a7 WD |
427 | if (asprintf(&p, "RSYNC_PID=%ld", (long)pid) > 0) |
428 | putenv(p); | |
c95ca2a2 WD |
429 | if (wait_process(pid, &status, 0) < 0) |
430 | status = -1; | |
503114a7 WD |
431 | if (asprintf(&p, "RSYNC_RAW_STATUS=%d", status) > 0) |
432 | putenv(p); | |
9d0d18b5 WD |
433 | if (WIFEXITED(status)) |
434 | status = WEXITSTATUS(status); | |
435 | else | |
436 | status = -1; | |
503114a7 WD |
437 | if (asprintf(&p, "RSYNC_EXIT_STATUS=%d", status) > 0) |
438 | putenv(p); | |
c95ca2a2 | 439 | system(lp_postxfer_exec(i)); |
9d0d18b5 WD |
440 | _exit(status); |
441 | } | |
442 | } | |
c95ca2a2 WD |
443 | /* For pre-xfer exec, fork a child process to run the indicated |
444 | * command, though it first waits for the parent process to | |
445 | * send us the user's request via a pipe. */ | |
446 | if (*lp_prexfer_exec(i)) { | |
447 | int fds[2]; | |
503114a7 WD |
448 | if (asprintf(&p, "RSYNC_PID=%ld", (long)getpid()) > 0) |
449 | putenv(p); | |
c95ca2a2 WD |
450 | if (pipe(fds) < 0 || (pre_exec_pid = fork()) < 0) { |
451 | rsyserr(FLOG, errno, "pre-xfer exec preparation failed"); | |
452 | io_printf(f_out, "@ERROR: pre-xfer exec preparation failed\n"); | |
453 | return -1; | |
454 | } | |
455 | if (pre_exec_pid == 0) { | |
141c6265 WD |
456 | char buf[BIGPATHBUFLEN]; |
457 | int j, len; | |
c95ca2a2 WD |
458 | close(fds[1]); |
459 | set_blocking(fds[0]); | |
141c6265 | 460 | len = read_arg_from_pipe(fds[0], buf, BIGPATHBUFLEN); |
c95ca2a2 WD |
461 | if (len <= 0) |
462 | _exit(1); | |
503114a7 WD |
463 | if (asprintf(&p, "RSYNC_REQUEST=%s", buf) > 0) |
464 | putenv(p); | |
141c6265 WD |
465 | for (j = 0; ; j++) { |
466 | len = read_arg_from_pipe(fds[0], buf, | |
467 | BIGPATHBUFLEN); | |
468 | if (len <= 0) { | |
469 | if (!len) | |
470 | break; | |
471 | _exit(1); | |
472 | } | |
503114a7 WD |
473 | if (asprintf(&p, "RSYNC_ARG%d=%s", j, buf) > 0) |
474 | putenv(p); | |
141c6265 WD |
475 | } |
476 | close(fds[0]); | |
c95ca2a2 WD |
477 | close(STDIN_FILENO); |
478 | close(STDOUT_FILENO); | |
479 | status = system(lp_prexfer_exec(i)); | |
480 | if (!WIFEXITED(status)) | |
481 | _exit(1); | |
482 | _exit(WEXITSTATUS(status)); | |
483 | } | |
484 | close(fds[0]); | |
485 | set_blocking(fds[1]); | |
486 | pre_exec_fd = fds[1]; | |
487 | } | |
9d0d18b5 WD |
488 | umask(0); |
489 | } | |
490 | #endif | |
491 | ||
8638dd48 | 492 | if (use_chroot) { |
b52c1d9d MP |
493 | /* |
494 | * XXX: The 'use chroot' flag is a fairly reliable | |
495 | * source of confusion, because it fails under two | |
496 | * important circumstances: running as non-root, | |
497 | * running on Win32 (or possibly others). On the | |
498 | * other hand, if you are running as root, then it | |
499 | * might be better to always use chroot. | |
500 | * | |
501 | * So, perhaps if we can't chroot we should just issue | |
502 | * a warning, unless a "require chroot" flag is set, | |
503 | * in which case we fail. | |
504 | */ | |
8638dd48 | 505 | if (chroot(lp_path(i))) { |
4875d6b6 | 506 | rsyserr(FLOG, errno, "chroot %s failed", |
45c49b52 | 507 | lp_path(i)); |
68f40ebb | 508 | io_printf(f_out, "@ERROR: chroot failed\n"); |
8638dd48 DD |
509 | return -1; |
510 | } | |
3591c066 | 511 | |
6f3684ff | 512 | if (!push_dir("/", 0)) { |
4875d6b6 | 513 | rsyserr(FLOG, errno, "chdir %s failed\n", |
45c49b52 | 514 | lp_path(i)); |
68f40ebb | 515 | io_printf(f_out, "@ERROR: chdir failed\n"); |
8638dd48 DD |
516 | return -1; |
517 | } | |
3591c066 | 518 | |
716baed7 | 519 | } else { |
6f3684ff | 520 | if (!push_dir(lp_path(i), 0)) { |
4875d6b6 | 521 | rsyserr(FLOG, errno, "chdir %s failed\n", |
45c49b52 | 522 | lp_path(i)); |
68f40ebb | 523 | io_printf(f_out, "@ERROR: chdir failed\n"); |
716baed7 DD |
524 | return -1; |
525 | } | |
cb13abfe | 526 | sanitize_paths = 1; |
716baed7 DD |
527 | } |
528 | ||
529 | if (am_root) { | |
715d1f45 MP |
530 | /* XXXX: You could argue that if the daemon is started |
531 | * by a non-root user and they explicitly specify a | |
532 | * gid, then we should try to change to that gid -- | |
533 | * this could be possible if it's already in their | |
534 | * supplementary groups. */ | |
535 | ||
536 | /* TODO: Perhaps we need to document that if rsyncd is | |
537 | * started by somebody other than root it will inherit | |
538 | * all their supplementary groups. */ | |
539 | ||
716baed7 | 540 | if (setgid(gid)) { |
1732b6c0 | 541 | rsyserr(FLOG, errno, "setgid %d failed", (int)gid); |
68f40ebb | 542 | io_printf(f_out, "@ERROR: setgid failed\n"); |
8638dd48 DD |
543 | return -1; |
544 | } | |
4f5b0756 | 545 | #ifdef HAVE_SETGROUPS |
6969ebcf WD |
546 | /* Get rid of any supplementary groups this process |
547 | * might have inheristed. */ | |
548 | if (setgroups(1, &gid)) { | |
1732b6c0 | 549 | rsyserr(FLOG, errno, "setgroups failed"); |
6969ebcf WD |
550 | io_printf(f_out, "@ERROR: setgroups failed\n"); |
551 | return -1; | |
552 | } | |
553 | #endif | |
3591c066 | 554 | |
716baed7 | 555 | if (setuid(uid)) { |
1732b6c0 | 556 | rsyserr(FLOG, errno, "setuid %d failed", (int)uid); |
68f40ebb | 557 | io_printf(f_out, "@ERROR: setuid failed\n"); |
8638dd48 DD |
558 | return -1; |
559 | } | |
560 | ||
6fe05820 | 561 | am_root = (MY_UID() == 0); |
3591c066 AT |
562 | } |
563 | ||
fed1f3f4 WD |
564 | if (lp_temp_dir(i) && *lp_temp_dir(i)) { |
565 | tmpdir = lp_temp_dir(i); | |
566 | if (strlen(tmpdir) >= MAXPATHLEN - 10) { | |
567 | rprintf(FLOG, | |
568 | "the 'temp dir' value for %s is WAY too long -- ignoring.\n", | |
569 | name); | |
570 | tmpdir = NULL; | |
571 | } | |
572 | } | |
573 | ||
68f40ebb | 574 | io_printf(f_out, "@RSYNCD: OK\n"); |
3591c066 | 575 | |
b7061c82 WD |
576 | maxargs = MAX_ARGS; |
577 | if (!(argv = new_array(char *, maxargs))) | |
578 | out_of_memory("rsync_module"); | |
3591c066 AT |
579 | argv[argc++] = "rsyncd"; |
580 | ||
581 | while (1) { | |
2e94e70e | 582 | if (!read_line(f_in, line, sizeof line - 1)) |
3591c066 | 583 | return -1; |
3591c066 | 584 | |
2e94e70e WD |
585 | if (!*line) |
586 | break; | |
3591c066 | 587 | |
874895d5 AT |
588 | p = line; |
589 | ||
b7061c82 WD |
590 | if (argc == maxargs) { |
591 | maxargs += MAX_ARGS; | |
592 | if (!(argv = realloc_array(argv, char *, maxargs))) | |
593 | out_of_memory("rsync_module"); | |
594 | } | |
2e94e70e | 595 | if (!(argv[argc] = strdup(p))) |
b7061c82 | 596 | out_of_memory("rsync_module"); |
3591c066 | 597 | |
20accf4d WD |
598 | switch (start_glob) { |
599 | case 0: | |
874895d5 | 600 | argc++; |
20accf4d WD |
601 | if (strcmp(line, ".") == 0) |
602 | start_glob = 1; | |
603 | break; | |
604 | case 1: | |
c95ca2a2 WD |
605 | if (pre_exec_pid) { |
606 | err_msg = finish_pre_exec(pre_exec_pid, | |
141c6265 WD |
607 | pre_exec_fd, p, |
608 | argc, argv); | |
c95ca2a2 WD |
609 | pre_exec_pid = 0; |
610 | } | |
20accf4d WD |
611 | request = strdup(p); |
612 | start_glob = 2; | |
613 | /* FALL THROUGH */ | |
614 | default: | |
c95ca2a2 WD |
615 | if (!err_msg) |
616 | glob_expand(name, &argv, &argc, &maxargs); | |
20accf4d WD |
617 | break; |
618 | } | |
3591c066 AT |
619 | } |
620 | ||
141c6265 WD |
621 | if (pre_exec_pid) { |
622 | err_msg = finish_pre_exec(pre_exec_pid, pre_exec_fd, request, | |
623 | argc, argv); | |
624 | } | |
c95ca2a2 | 625 | |
18638730 | 626 | verbose = 0; /* future verbosity is controlled by client options */ |
c9dc1300 | 627 | ret = parse_arguments(&argc, (const char ***) &argv, 0); |
875a13b4 | 628 | am_server = 1; /* Don't let someone try to be tricky. */ |
3162ea6f WD |
629 | if (lp_ignore_errors(module_id)) |
630 | ignore_errors = 1; | |
3591c066 | 631 | |
7c2a9e76 WD |
632 | if (filesfrom_fd == 0) |
633 | filesfrom_fd = f_in; | |
634 | ||
7b372642 | 635 | if (request) { |
97cb8dc2 | 636 | if (*auth_user) { |
9e5a5ddb WD |
637 | rprintf(FLOG, "rsync %s %s from %s@%s (%s)\n", |
638 | am_sender ? "on" : "to", | |
97cb8dc2 | 639 | request, auth_user, host, addr); |
d0d56395 | 640 | } else { |
9e5a5ddb WD |
641 | rprintf(FLOG, "rsync %s %s from %s (%s)\n", |
642 | am_sender ? "on" : "to", | |
d0d56395 AT |
643 | request, host, addr); |
644 | } | |
7b372642 AT |
645 | free(request); |
646 | } | |
647 | ||
15b7b73d | 648 | #ifndef DEBUG |
3591c066 | 649 | /* don't allow the logs to be flooded too fast */ |
59b0e7a8 WD |
650 | if (verbose > lp_max_verbosity(i)) |
651 | verbose = lp_max_verbosity(i); | |
0199b05f | 652 | #endif |
3591c066 | 653 | |
1732b6c0 WD |
654 | if (protocol_version < 23 |
655 | && (protocol_version == 22 || am_sender)) | |
da3478b2 | 656 | io_start_multiplex_out(); |
c95ca2a2 | 657 | else if (!ret || err_msg) { |
1732b6c0 WD |
658 | /* We have to get I/O multiplexing started so that we can |
659 | * get the error back to the client. This means getting | |
660 | * the protocol setup finished first in later versions. */ | |
661 | setup_protocol(f_out, f_in); | |
b03c719f WD |
662 | if (!am_sender) { |
663 | /* Since we failed in our option parsing, we may not | |
664 | * have finished parsing that the client sent us a | |
665 | * --files-from option, so look for it manually. | |
666 | * Without this, the socket would be in the wrong | |
667 | * state for the upcoming error message. */ | |
668 | if (!files_from) { | |
669 | int i; | |
670 | for (i = 0; i < argc; i++) { | |
671 | if (strncmp(argv[i], "--files-from", 12) == 0) { | |
672 | files_from = ""; | |
673 | break; | |
674 | } | |
675 | } | |
676 | } | |
677 | if (files_from) | |
678 | write_byte(f_out, 0); | |
679 | } | |
da3478b2 | 680 | io_start_multiplex_out(); |
554e0a8d | 681 | } |
15b7b73d | 682 | |
c95ca2a2 WD |
683 | if (!ret || err_msg) { |
684 | if (err_msg) | |
9d33e6f7 | 685 | rwrite(FERROR, err_msg, strlen(err_msg)); |
c95ca2a2 WD |
686 | else |
687 | option_error(); | |
7e561438 | 688 | msleep(400); |
4a7144ee | 689 | exit_cleanup(RERR_UNSUPPORTED); |
41979ff8 AT |
690 | } |
691 | ||
3e6ddb37 WD |
692 | if (lp_timeout(i) && lp_timeout(i) > io_timeout) |
693 | set_io_timeout(lp_timeout(i)); | |
81791cfc | 694 | |
f041b025 WD |
695 | /* If we have some incoming/outgoing chmod changes, append them to |
696 | * any user-specified changes (making our changes have priority). | |
697 | * We also get a pointer to just our changes so that a receiver | |
698 | * process can use them separately if --perms wasn't specified. */ | |
aaccaa88 WD |
699 | if (am_sender) |
700 | p = lp_outgoing_chmod(i); | |
701 | else | |
702 | p = lp_incoming_chmod(i); | |
8840ec0f | 703 | if (*p && !(daemon_chmod_modes = parse_chmod(p, &chmod_modes))) { |
aaccaa88 WD |
704 | rprintf(FLOG, "Invalid \"%sing chmod\" directive: %s\n", |
705 | am_sender ? "outgo" : "incom", p); | |
706 | } | |
730df9d2 | 707 | |
c9dc1300 | 708 | start_server(f_in, f_out, argc, argv); |
3591c066 AT |
709 | |
710 | return 0; | |
711 | } | |
712 | ||
7a6421fa AT |
713 | /* send a list of available modules to the client. Don't list those |
714 | with "list = False". */ | |
3591c066 AT |
715 | static void send_listing(int fd) |
716 | { | |
717 | int n = lp_numservices(); | |
718 | int i; | |
063393d6 | 719 | |
c0422cea | 720 | for (i = 0; i < n; i++) { |
3591c066 | 721 | if (lp_list(i)) |
4a7144ee | 722 | io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i)); |
c0422cea | 723 | } |
8f04bb36 | 724 | |
daa598df | 725 | if (protocol_version >= 25) |
063393d6 | 726 | io_printf(fd,"@RSYNCD: EXIT\n"); |
3591c066 AT |
727 | } |
728 | ||
68f40ebb | 729 | /* this is called when a connection is established to a client |
3591c066 AT |
730 | and we want to start talking. The setup of the system is done from |
731 | here */ | |
68f40ebb | 732 | int start_daemon(int f_in, int f_out) |
3591c066 | 733 | { |
20accf4d | 734 | char line[1024]; |
374c3e12 | 735 | char *motd, *addr, *host; |
c0422cea | 736 | int i; |
4cdf25e4 | 737 | |
da3478b2 WD |
738 | io_set_sock_fds(f_in, f_out); |
739 | ||
374c3e12 WD |
740 | /* We must load the config file before calling any function that |
741 | * might cause log-file output to occur. This ensures that the | |
742 | * "log file" param gets honored for the 2 non-forked use-cases | |
08e0a629 | 743 | * (when rsync is run by init and run by a remote shell). */ |
2e94e70e | 744 | if (!lp_load(config_file, 0)) |
65417579 | 745 | exit_cleanup(RERR_SYNTAX); |
3591c066 | 746 | |
374c3e12 WD |
747 | addr = client_addr(f_in); |
748 | host = client_name(f_in); | |
749 | rprintf(FLOG, "connect from %s (%s)\n", host, addr); | |
91d324b4 | 750 | |
68f40ebb WD |
751 | if (!am_server) { |
752 | set_socket_options(f_in, "SO_KEEPALIVE"); | |
34937987 WD |
753 | if (sockopts) |
754 | set_socket_options(f_in, sockopts); | |
755 | else | |
756 | set_socket_options(f_in, lp_socket_options()); | |
68f40ebb WD |
757 | set_nonblocking(f_in); |
758 | } | |
3591c066 | 759 | |
5a8543b8 | 760 | io_printf(f_out, "@RSYNCD: %d\n", protocol_version); |
3591c066 AT |
761 | |
762 | motd = lp_motd_file(); | |
27d3cdbc | 763 | if (motd && *motd) { |
0090cbdb | 764 | FILE *f = fopen(motd,"r"); |
3591c066 | 765 | while (f && !feof(f)) { |
2e94e70e | 766 | int len = fread(line, 1, sizeof line - 1, f); |
3591c066 AT |
767 | if (len > 0) { |
768 | line[len] = 0; | |
68f40ebb | 769 | io_printf(f_out, "%s", line); |
3591c066 AT |
770 | } |
771 | } | |
2e94e70e WD |
772 | if (f) |
773 | fclose(f); | |
68f40ebb | 774 | io_printf(f_out, "\n"); |
3591c066 AT |
775 | } |
776 | ||
2e94e70e | 777 | if (!read_line(f_in, line, sizeof line - 1)) |
91eee594 | 778 | return -1; |
91eee594 | 779 | |
daa598df | 780 | if (sscanf(line,"@RSYNCD: %d", &remote_protocol) != 1) { |
68f40ebb | 781 | io_printf(f_out, "@ERROR: protocol startup error\n"); |
91eee594 | 782 | return -1; |
4a7144ee | 783 | } |
daa598df WD |
784 | if (protocol_version > remote_protocol) |
785 | protocol_version = remote_protocol; | |
91eee594 | 786 | |
c0422cea WD |
787 | line[0] = 0; |
788 | if (!read_line(f_in, line, sizeof line - 1)) | |
789 | return -1; | |
3591c066 | 790 | |
c0422cea | 791 | if (!*line || strcmp(line, "#list") == 0) { |
b3e15181 WD |
792 | rprintf(FLOG, "module-list request from %s (%s)\n", |
793 | host, addr); | |
c0422cea WD |
794 | send_listing(f_out); |
795 | return -1; | |
796 | } | |
3591c066 | 797 | |
c0422cea WD |
798 | if (*line == '#') { |
799 | /* it's some sort of command that I don't understand */ | |
800 | io_printf(f_out, "@ERROR: Unknown command '%s'\n", line); | |
801 | return -1; | |
802 | } | |
3591c066 | 803 | |
c0422cea | 804 | if ((i = lp_number(line)) < 0) { |
c0422cea WD |
805 | rprintf(FLOG, "unknown module '%s' tried from %s (%s)\n", |
806 | line, host, addr); | |
807 | io_printf(f_out, "@ERROR: Unknown module '%s'\n", line); | |
808 | return -1; | |
3591c066 AT |
809 | } |
810 | ||
d749eb68 WD |
811 | #ifdef HAVE_SIGACTION |
812 | sigact.sa_flags = SA_NOCLDSTOP; | |
813 | #endif | |
814 | SIGACTION(SIGCHLD, remember_children); | |
815 | ||
439a198d | 816 | return rsync_module(f_in, f_out, i, addr, host); |
3591c066 AT |
817 | } |
818 | ||
3591c066 AT |
819 | int daemon_main(void) |
820 | { | |
8638dd48 | 821 | char *pid_file; |
1a016bfd | 822 | |
3591c066 | 823 | if (is_a_socket(STDIN_FILENO)) { |
41979ff8 AT |
824 | int i; |
825 | ||
826 | /* we are running via inetd - close off stdout and | |
4a7144ee WD |
827 | * stderr so that library functions (and getopt) don't |
828 | * try to use them. Redirect them to /dev/null */ | |
2e94e70e | 829 | for (i = 1; i < 3; i++) { |
4a7144ee | 830 | close(i); |
41979ff8 AT |
831 | open("/dev/null", O_RDWR); |
832 | } | |
3eb38818 | 833 | |
68f40ebb | 834 | return start_daemon(STDIN_FILENO, STDIN_FILENO); |
3591c066 AT |
835 | } |
836 | ||
13e29995 | 837 | if (!no_detach) |
4a7144ee | 838 | become_daemon(); |
3591c066 | 839 | |
2e94e70e | 840 | if (!lp_load(config_file, 1)) |
65417579 | 841 | exit_cleanup(RERR_SYNTAX); |
f9e940ef | 842 | |
0c56b1ad WD |
843 | if (rsync_port == 0 && (rsync_port = lp_rsync_port()) == 0) |
844 | rsync_port = RSYNC_PORT; | |
3dfe6e97 | 845 | if (bind_address == NULL && *lp_bind_address()) |
986aaaaa | 846 | bind_address = lp_bind_address(); |
0c56b1ad | 847 | |
6dc9b74b | 848 | log_init(0); |
f9e940ef | 849 | |
9e5a5ddb | 850 | rprintf(FLOG, "rsyncd version %s starting, listening on port %d\n", |
4a7144ee WD |
851 | RSYNC_VERSION, rsync_port); |
852 | /* TODO: If listening on a particular address, then show that | |
853 | * address too. In fact, why not just do inet_ntop on the | |
854 | * local address??? */ | |
e42c9458 | 855 | |
8638dd48 | 856 | if (((pid_file = lp_pid_file()) != NULL) && (*pid_file != '\0')) { |
ad517ce5 DD |
857 | char pidbuf[16]; |
858 | int fd; | |
05b7bab8 | 859 | pid_t pid = getpid(); |
8638dd48 | 860 | cleanup_set_pid(pid); |
ad517ce5 DD |
861 | if ((fd = do_open(lp_pid_file(), O_WRONLY|O_CREAT|O_TRUNC, |
862 | 0666 & ~orig_umask)) == -1) { | |
4a7144ee | 863 | cleanup_set_pid(0); |
4875d6b6 | 864 | rsyserr(FLOG, errno, "failed to create pid file %s", |
45c49b52 | 865 | pid_file); |
4a7144ee | 866 | exit_cleanup(RERR_FILEIO); |
8638dd48 | 867 | } |
05b7bab8 | 868 | snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid); |
ad517ce5 DD |
869 | write(fd, pidbuf, strlen(pidbuf)); |
870 | close(fd); | |
8638dd48 DD |
871 | } |
872 | ||
8ef4ffd6 AT |
873 | start_accept_loop(rsync_port, start_daemon); |
874 | return -1; | |
3591c066 | 875 | } |