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d67281a7 UD |
1 | /* Copyright (c) 1998 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. | |
3 | Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1998. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Library General Public License as | |
7 | published by the Free Software Foundation; either version 2 of the | |
8 | License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Library General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Library General Public | |
16 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | #include <errno.h> | |
21 | #include <error.h> | |
22 | #include <fcntl.h> | |
23 | #include <libintl.h> | |
24 | #include <locale.h> | |
25 | #include <pthread.h> | |
26 | #include <pwd.h> | |
27 | #include <stdio.h> | |
28 | #include <stdlib.h> | |
29 | #include <unistd.h> | |
a53bad16 | 30 | #include <sys/poll.h> |
d67281a7 UD |
31 | #include <sys/socket.h> |
32 | #include <sys/stat.h> | |
33 | #include <sys/types.h> | |
34 | #include <sys/uio.h> | |
35 | #include <sys/un.h> | |
36 | ||
37 | #include "nscd.h" | |
38 | #include "dbg_log.h" | |
39 | ||
40 | /* Socket 0 in the array is named and exported into the file namespace | |
a53bad16 UD |
41 | as a connection point for clients. There's a one to one |
42 | correspondence between sock[i] and read_polls[i]. */ | |
d67281a7 UD |
43 | static int sock[MAX_NUM_CONNECTIONS]; |
44 | static int socks_active; | |
a53bad16 | 45 | static struct pollfd read_polls[MAX_NUM_CONNECTIONS]; |
d67281a7 UD |
46 | static pthread_mutex_t sock_lock = PTHREAD_MUTEX_INITIALIZER; |
47 | ||
48 | ||
49 | /* Cleanup. */ | |
50 | void | |
51 | close_sockets (void) | |
52 | { | |
53 | int i; | |
54 | ||
55 | if (debug_flag) | |
56 | dbg_log (_("close_sockets called")); | |
57 | ||
58 | pthread_mutex_lock (&sock_lock); | |
59 | ||
60 | /* Close sockets. */ | |
61 | for (i = 0; i < MAX_NUM_CONNECTIONS; ++i) | |
62 | if (sock[i] != 0) | |
63 | { | |
64 | if (close (sock[i])) | |
65 | dbg_log (_("socket [%d|%d] close: %s"), strerror (errno)); | |
66 | ||
67 | sock[i] = 0; | |
a53bad16 | 68 | read_polls[i].fd = -1; |
d67281a7 UD |
69 | --socks_active; |
70 | } | |
71 | ||
72 | pthread_mutex_unlock (&sock_lock); | |
73 | } | |
74 | ||
75 | void | |
76 | close_socket (int conn) | |
77 | { | |
78 | if (debug_flag > 2) | |
79 | dbg_log (_("close socket (%d|%d)"), conn, sock[conn]); | |
80 | ||
81 | pthread_mutex_lock (&sock_lock); | |
82 | ||
83 | close (sock[conn]); | |
84 | sock[conn] = 0; | |
a53bad16 | 85 | read_polls[conn].fd = -1; |
d67281a7 UD |
86 | --socks_active; |
87 | ||
88 | pthread_mutex_unlock (&sock_lock); | |
89 | } | |
90 | ||
a53bad16 | 91 | /* Local routine, assigns a socket to a new connection request. */ |
d67281a7 UD |
92 | static void |
93 | handle_new_connection (void) | |
94 | { | |
95 | int i; | |
96 | ||
97 | if (debug_flag > 2) | |
98 | dbg_log (_("handle_new_connection")); | |
99 | ||
100 | pthread_mutex_lock (&sock_lock); | |
101 | ||
102 | if (socks_active < MAX_NUM_CONNECTIONS) | |
103 | /* Find a free socket entry to use. */ | |
104 | for (i = 1; i < MAX_NUM_CONNECTIONS; ++i) | |
105 | { | |
106 | if (sock[i] == 0) | |
107 | { | |
108 | if ((sock[i] = accept (sock[0], NULL, NULL)) < 0) | |
109 | { | |
110 | dbg_log (_("socket accept: %s"), strerror (errno)); | |
111 | return; | |
112 | } | |
113 | ++socks_active; | |
a53bad16 UD |
114 | read_polls[i].fd = sock[i]; |
115 | read_polls[i].events = POLLRDNORM; | |
d67281a7 UD |
116 | if (debug_flag > 2) |
117 | dbg_log (_("handle_new_connection used socket %d|%d"), i, | |
118 | sock[i]); | |
119 | break; | |
120 | } | |
121 | } | |
122 | else | |
123 | { | |
124 | int black_widow_sock; | |
125 | dbg_log (_("Supported number of simultainious connections exceeded")); | |
126 | dbg_log (_("Ignoring client connect request")); | |
127 | /* There has to be a better way to ignore a connection request,.. | |
128 | when I get my hands on a sockets wiz I'll modify this. */ | |
129 | black_widow_sock = accept (sock[0], NULL, NULL); | |
130 | close (black_widow_sock); | |
131 | } | |
132 | pthread_mutex_unlock (&sock_lock); | |
133 | } | |
134 | ||
a53bad16 | 135 | /* Local routine, reads a request off a socket indicated by read_polls. */ |
d67281a7 | 136 | static int |
a53bad16 | 137 | handle_new_request (int **connp, request_header **reqp, char **key) |
d67281a7 UD |
138 | { |
139 | ssize_t nbytes; | |
140 | int i; | |
141 | ||
142 | if (debug_flag) | |
143 | dbg_log ("handle_new_request"); | |
144 | ||
145 | /* Find the descriptor. */ | |
146 | for (i = 1; i < MAX_NUM_CONNECTIONS; ++i) | |
a53bad16 | 147 | if (read_polls[i].revents & (POLLRDNORM|POLLERR)) |
d67281a7 UD |
148 | break; |
149 | ||
150 | if (debug_flag > 2) | |
151 | dbg_log (_("handle_new_request uses socket %d"), i); | |
152 | ||
153 | /* Read from it. */ | |
154 | nbytes = read (sock[i], *reqp, sizeof (request_header)); | |
155 | if (nbytes != sizeof (request_header)) | |
156 | { | |
157 | /* Handle non-data read cases. */ | |
158 | if (nbytes == 0) | |
159 | { | |
160 | /* Close socket down. */ | |
161 | if (debug_flag > 2) | |
162 | dbg_log (_("Real close socket %d|%d"), i, sock[i]); | |
163 | ||
164 | pthread_mutex_lock (&sock_lock); | |
a53bad16 | 165 | read_polls[i].fd = -1; |
d67281a7 UD |
166 | close (sock[i]); |
167 | sock[i] = 0; | |
168 | --socks_active; | |
169 | pthread_mutex_unlock (&sock_lock); | |
170 | } | |
171 | else | |
172 | if (nbytes < 0) | |
173 | { | |
174 | dbg_log (_("Read(%d|%d) error on get request: %s"), | |
175 | i, sock[i], strerror (errno)); | |
176 | exit (1); | |
177 | } | |
178 | else | |
179 | dbg_log (_("Read, data < request buf size, ignoring data")); | |
180 | ||
181 | return -1; | |
182 | } | |
183 | else | |
184 | { | |
185 | *key = malloc ((*reqp)->key_len + 1); | |
186 | /* Read the key from it */ | |
187 | nbytes = read (sock[i], *key, (*reqp)->key_len); | |
188 | if (nbytes != (*reqp)->key_len) | |
189 | { | |
190 | /* Handle non-data read cases. */ | |
191 | if (nbytes == 0) | |
192 | { | |
193 | /* Close socket down. */ | |
194 | if (debug_flag > 2) | |
195 | dbg_log (_("Real close socket %d|%d"), i, sock[i]); | |
196 | ||
197 | pthread_mutex_lock (&sock_lock); | |
a53bad16 | 198 | read_polls[i].fd = -1; |
d67281a7 UD |
199 | close (sock[i]); |
200 | sock[i] = 0; | |
201 | --socks_active; | |
202 | pthread_mutex_unlock (&sock_lock); | |
203 | } | |
204 | else | |
205 | if (nbytes < 0) | |
206 | { | |
207 | perror (_("Read() error on get request")); | |
208 | return 0; | |
209 | } | |
210 | else | |
211 | fputs (_("Read, data < request buf size, ignoring data"), | |
212 | stderr); | |
213 | ||
214 | free (*key); | |
215 | return -1; | |
216 | } | |
217 | else | |
218 | { | |
219 | /* Ok, have a live one, A real data req buf has been obtained. */ | |
220 | (*key)[(*reqp)->key_len] = '\0'; | |
221 | **connp = i; | |
222 | return 0; | |
223 | } | |
224 | } | |
225 | } | |
226 | ||
227 | void | |
228 | get_request (int *conn, request_header *req, char **key) | |
229 | { | |
a53bad16 UD |
230 | int done = 0; |
231 | int nr; | |
d67281a7 UD |
232 | |
233 | if (debug_flag) | |
234 | dbg_log ("get_request"); | |
235 | ||
236 | /* loop, processing new connection requests until a client buffer | |
237 | is read in on an existing connection. */ | |
238 | while (!done) | |
239 | { | |
a53bad16 UD |
240 | /* Poll active connections. */ |
241 | nr = poll (read_polls, MAX_NUM_CONNECTIONS, -1); | |
d67281a7 UD |
242 | if (nr <= 0) |
243 | { | |
a53bad16 | 244 | perror (_("Poll new reads")); |
d67281a7 UD |
245 | exit (1); |
246 | } | |
a53bad16 | 247 | if (read_polls[0].revents & (POLLRDNORM|POLLERR)) |
d67281a7 UD |
248 | /* Handle the case of a new connection request on the named socket. */ |
249 | handle_new_connection (); | |
250 | else | |
251 | { | |
252 | /* Read data from client specific descriptor. */ | |
a53bad16 UD |
253 | if (handle_new_request (&conn, &req, key) == 0) |
254 | done = 1; | |
d67281a7 UD |
255 | } |
256 | } /* While not_done. */ | |
257 | } | |
258 | ||
259 | void | |
260 | init_sockets (void) | |
261 | { | |
262 | struct sockaddr_un sock_addr; | |
a53bad16 | 263 | int i; |
d67281a7 UD |
264 | |
265 | /* Initialize the connections db. */ | |
266 | socks_active = 0; | |
a53bad16 UD |
267 | |
268 | /* Initialize the poll array. */ | |
269 | for (i = 0; i < MAX_NUM_CONNECTIONS; i++) | |
270 | read_polls[i].fd = -1; | |
d67281a7 UD |
271 | |
272 | /* Create the socket. */ | |
273 | sock[0] = socket (AF_UNIX, SOCK_STREAM, 0); | |
274 | if (sock[0] < 0) | |
275 | { | |
276 | perror (_("cannot create socket")); | |
277 | exit (1); | |
278 | } | |
279 | /* Bind a name to the socket. */ | |
280 | sock_addr.sun_family = AF_UNIX; | |
281 | strcpy (sock_addr.sun_path, _PATH_NSCDSOCKET); | |
282 | if (bind (sock[0], (struct sockaddr *) &sock_addr, sizeof (sock_addr)) < 0) | |
283 | { | |
284 | dbg_log ("%s: %s", _PATH_NSCDSOCKET, strerror (errno)); | |
285 | exit (1); | |
286 | } | |
287 | /* Set permissions for the socket. */ | |
288 | chmod (_PATH_NSCDSOCKET, 0666); | |
289 | ||
290 | /* Set the socket up to accept connections. */ | |
291 | if (listen (sock[0], MAX_NUM_CONNECTIONS) < 0) | |
292 | { | |
293 | perror (_("cannot enable socket to accept connections")); | |
294 | exit (1); | |
295 | } | |
296 | ||
297 | /* Add the socket to the server's set of active sockets. */ | |
a53bad16 UD |
298 | read_polls[0].fd = sock[0]; |
299 | read_polls[0].events = POLLRDNORM; | |
d67281a7 UD |
300 | ++socks_active; |
301 | } | |
302 | ||
303 | void | |
304 | pw_send_answer (int conn, struct passwd *pwd) | |
305 | { | |
306 | pw_response_header resp; | |
307 | ||
308 | resp.version = NSCD_VERSION; | |
309 | if (pwd != NULL) | |
310 | { | |
311 | resp.found = 1; | |
312 | resp.pw_name_len = strlen (pwd->pw_name); | |
313 | resp.pw_passwd_len = strlen (pwd->pw_passwd); | |
314 | resp.pw_uid = pwd->pw_uid; | |
315 | resp.pw_gid = pwd->pw_gid; | |
316 | resp.pw_gecos_len = strlen (pwd->pw_gecos); | |
317 | resp.pw_dir_len = strlen (pwd->pw_dir); | |
318 | resp.pw_shell_len = strlen (pwd->pw_shell); | |
319 | } | |
320 | else | |
321 | { | |
322 | resp.found = 0; | |
323 | resp.pw_name_len = 0; | |
324 | resp.pw_passwd_len = 0; | |
325 | resp.pw_uid = -1; | |
326 | resp.pw_gid = -1; | |
327 | resp.pw_gecos_len = 0; | |
328 | resp.pw_dir_len = 0; | |
329 | resp.pw_shell_len = 0; | |
330 | } | |
331 | if (sock[conn] == 0) | |
332 | { | |
333 | dbg_log (_("bad connection id on send response [%d|%d]"), | |
334 | conn, sock[conn]); | |
335 | return; | |
336 | } | |
337 | ||
338 | /* Send response header. */ | |
339 | if (write (sock[conn], &resp, sizeof (pw_response_header)) != | |
340 | sizeof (pw_response_header)) | |
341 | { | |
342 | dbg_log (_("write incomplete on send response: %s"), strerror (errno)); | |
343 | return; | |
344 | } | |
345 | ||
346 | if (resp.found) | |
347 | { | |
348 | struct iovec vec[5]; | |
349 | ||
350 | /* Send pw_name. */ | |
351 | vec[0].iov_base = pwd->pw_name; | |
352 | vec[0].iov_len = resp.pw_name_len; | |
353 | /* Send pw_passwd. */ | |
354 | vec[1].iov_base = pwd->pw_passwd; | |
355 | vec[1].iov_len = resp.pw_passwd_len; | |
356 | /* Send pw_gecos. */ | |
357 | vec[2].iov_base = pwd->pw_gecos; | |
358 | vec[2].iov_len = resp.pw_gecos_len; | |
359 | /* Send pw_dir. */ | |
360 | vec[3].iov_base = pwd->pw_dir; | |
361 | vec[3].iov_len = resp.pw_dir_len; | |
362 | /* Send pw_shell. */ | |
363 | vec[4].iov_base = pwd->pw_shell; | |
364 | vec[4].iov_len = resp.pw_shell_len; | |
365 | ||
366 | if (writev (sock[conn], vec, 5) != (resp.pw_name_len + resp.pw_passwd_len | |
367 | + resp.pw_gecos_len + resp.pw_dir_len | |
368 | + resp.pw_shell_len)) | |
369 | dbg_log (_("write incomplete on send passwd answer: %s"), | |
370 | strerror (errno)); | |
371 | } | |
372 | } | |
373 | ||
374 | void | |
375 | pw_send_disabled (int conn) | |
376 | { | |
377 | pw_response_header resp; | |
378 | ||
379 | resp.version = NSCD_VERSION; | |
380 | resp.found = -1; | |
381 | resp.pw_name_len = 0; | |
382 | resp.pw_passwd_len = 0; | |
383 | resp.pw_uid = -1; | |
384 | resp.pw_gid = -1; | |
385 | resp.pw_gecos_len = 0; | |
386 | resp.pw_dir_len = 0; | |
387 | resp.pw_shell_len = 0; | |
388 | ||
389 | if (sock[conn] == 0) | |
390 | { | |
14e9dd67 | 391 | dbg_log (_("bad connection id on send response [%d|%d]"), |
d67281a7 UD |
392 | conn, sock[conn]); |
393 | return; | |
394 | } | |
395 | ||
396 | /* Send response header. */ | |
397 | if (write (sock[conn], &resp, sizeof (pw_response_header)) | |
398 | != sizeof (pw_response_header)) | |
399 | dbg_log (_("write incomplete on send response: %s"), strerror (errno)); | |
400 | } | |
401 | ||
402 | void | |
403 | gr_send_answer (int conn, struct group *grp) | |
404 | { | |
405 | gr_response_header resp; | |
406 | ||
407 | resp.version = NSCD_VERSION; | |
408 | if (grp != NULL) | |
409 | { | |
410 | resp.found = 1; | |
411 | resp.gr_name_len = strlen (grp->gr_name); | |
412 | resp.gr_passwd_len = strlen (grp->gr_passwd); | |
413 | resp.gr_gid = grp->gr_gid; | |
414 | resp.gr_mem_len = 0; | |
415 | while (grp->gr_mem[resp.gr_mem_len]) | |
416 | ++resp.gr_mem_len; | |
417 | } | |
418 | else | |
419 | { | |
420 | resp.found = 0; | |
421 | resp.gr_name_len = 0; | |
422 | resp.gr_passwd_len = 0; | |
423 | resp.gr_gid = -1; | |
424 | resp.gr_mem_len = 0; | |
425 | } | |
426 | if (sock[conn] == 0) | |
427 | { | |
428 | dbg_log (_("bad connection id on send response [%d|%d]"), | |
429 | conn, sock[conn]); | |
430 | return; | |
431 | } | |
432 | ||
433 | /* Send response header. */ | |
434 | if (write (sock[conn], &resp, sizeof (gr_response_header)) | |
435 | != sizeof (gr_response_header)) | |
436 | { | |
437 | dbg_log (_("write incomplete on send response: %s"), strerror (errno)); | |
438 | return; | |
439 | } | |
440 | ||
441 | if (resp.found) | |
442 | { | |
443 | unsigned int l = 0; | |
444 | ||
445 | /* Send gr_name. */ | |
446 | if (write (sock[conn], grp->gr_name, resp.gr_name_len) | |
447 | != resp.gr_name_len) | |
448 | { | |
449 | dbg_log (_("write incomplete on send response: %s"), | |
450 | strerror (errno)); | |
451 | return; | |
452 | } | |
453 | /* Send gr_passwd. */ | |
454 | if (write (sock[conn], grp->gr_passwd, resp.gr_passwd_len) | |
455 | != resp.gr_passwd_len) | |
456 | { | |
457 | dbg_log (_("write incomplete on send response: %s"), | |
458 | strerror (errno)); | |
459 | return; | |
460 | } | |
461 | ||
462 | while (grp->gr_mem[l]) | |
463 | { | |
464 | size_t len = strlen (grp->gr_mem[l]); | |
465 | ||
466 | if (write (sock[conn], &len, sizeof (len)) != sizeof (len)) | |
467 | { | |
468 | dbg_log (_("write incomplete on send response: %s"), | |
469 | strerror (errno)); | |
470 | return; | |
471 | } | |
472 | if (write (sock[conn], grp->gr_mem[l], len) != len) | |
473 | { | |
474 | dbg_log (_("write incomplete on send response: %s"), | |
475 | strerror (errno)); | |
476 | return; | |
477 | } | |
478 | ++l; | |
479 | } | |
480 | } | |
481 | } | |
482 | ||
483 | void | |
484 | gr_send_disabled (int conn) | |
485 | { | |
486 | gr_response_header resp; | |
487 | ||
488 | resp.version = NSCD_VERSION; | |
489 | resp.found = -1; | |
490 | resp.gr_name_len = 0; | |
491 | resp.gr_passwd_len = 0; | |
492 | resp.gr_gid = -1; | |
493 | resp.gr_mem_len = 0; | |
494 | ||
495 | if (sock[conn] == 0) | |
496 | { | |
497 | dbg_log (_("bad connection id on send gr_disabled response [%d|%d]"), | |
498 | conn, sock[conn]); | |
499 | return; | |
500 | } | |
501 | ||
502 | /* Send response header. */ | |
503 | if (write (sock[conn], &resp, sizeof (gr_response_header)) | |
504 | != sizeof (gr_response_header)) | |
505 | dbg_log (_("write incomplete on send gr_disabled response: %s"), | |
506 | strerror (errno)); | |
507 | } | |
508 | ||
509 | void | |
510 | stat_send (int conn, stat_response_header *resp) | |
511 | { | |
512 | if (sock[conn] == 0) | |
513 | { | |
514 | dbg_log (_("bad connection id on send stat response [%d|%d]"), | |
515 | conn, sock[conn]); | |
516 | return; | |
517 | } | |
518 | ||
519 | /* send response header. */ | |
520 | if (write (sock[conn], resp, sizeof (stat_response_header)) | |
521 | != sizeof (stat_response_header)) | |
522 | dbg_log (_("write incomplete on send stat response: %s"), | |
523 | strerror (errno)); | |
524 | } |