1/* Copyright (C) 1997-2024 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18#include <errno.h>
19#include <stdio.h>
20#include <stdlib.h>
21#include <unistd.h>
22#include <libintl.h>
23#include <rpc/rpc.h>
24#include <rpc/pmap_clnt.h>
25#include <string.h>
26#include <memory.h>
27#include <syslog.h>
28#include <sys/poll.h>
29#include <sys/socket.h>
30#include <netinet/in.h>
31#include <arpa/inet.h>
32#include <rpc/key_prot.h>
33#include <rpcsvc/nis.h>
34#include <rpcsvc/nis_callback.h>
35#include <libc-lock.h>
36
37#include "nis_xdr.h"
38#include "nis_intern.h"
39
40/* Sorry, we are not able to make this threadsafe. Stupid. But some
41 functions doesn't send us a nis_result obj, so we don't have a
42 cookie. Maybe we could use keys for threads ? Have to learn more
43 about pthreads -- kukuk@vt.uni-paderborn.de */
44
45static nis_cb *data;
46
47__libc_lock_define_initialized (static, callback)
48
49
50#if 0
51static char *
52__nis_getpkey(const char *sname)
53{
54 char buf[(strlen (sname) + 1) * 2 + 40];
55 char pkey[HEXKEYBYTES + 1];
56 char *cp, *domain;
57 nis_result *res;
58 unsigned int len = 0;
59
60 domain = strchr (sname, '.');
61 if (domain == NULL)
62 return NULL;
63
64 /* Remove prefixing dot */
65 ++domain;
66
67 cp = stpcpy (buf, "[cname=");
68 cp = stpcpy (cp, sname);
69 cp = stpcpy (cp, ",auth_type=DES],cred.org_dir.");
70 cp = stpcpy (cp, domain);
71
72 res = nis_list (buf, USE_DGRAM|NO_AUTHINFO|FOLLOW_LINKS|FOLLOW_PATH,
73 NULL, NULL);
74
75 if (res == NULL)
76 return NULL;
77
78 if (NIS_RES_STATUS (res) != NIS_SUCCESS)
79 {
80 nis_freeresult (res);
81 return NULL;
82 }
83
84 len = ENTRY_LEN(NIS_RES_OBJECT(res), 3);
85 strncpy (pkey, ENTRY_VAL(NIS_RES_OBJECT(res), 3), len);
86 pkey[len] = '\0';
87 cp = strchr (pkey, ':');
88 if (cp != NULL)
89 *cp = '\0';
90
91 nis_freeresult (res);
92
93 return strdup (pkey);
94}
95#endif
96
97static void
98cb_prog_1 (struct svc_req *rqstp, SVCXPRT *transp)
99{
100 union
101 {
102 cback_data cbproc_receive_1_arg;
103 nis_error cbproc_error_1_arg;
104 }
105 argument;
106 char *result;
107 xdrproc_t xdr_argument, xdr_result;
108 bool_t bool_result;
109
110 switch (rqstp->rq_proc)
111 {
112 case NULLPROC:
113 svc_sendreply (xprt: transp, xdr_results: (xdrproc_t) xdr_void, xdr_location: (char *) NULL);
114 return;
115
116 case CBPROC_RECEIVE:
117 {
118 unsigned int i;
119
120 xdr_argument = (xdrproc_t) xdr_cback_data;
121 xdr_result = (xdrproc_t) xdr_bool;
122 memset (s: &argument, c: 0, n: sizeof (argument));
123 if (!svc_getargs (transp, xdr_argument, (caddr_t) & argument))
124 {
125 svcerr_decode (xprt: transp);
126 return;
127 }
128 bool_result = FALSE;
129 for (i = 0; i < argument.cbproc_receive_1_arg.entries.entries_len; ++i)
130 {
131#define cbproc_entry(a) argument.cbproc_receive_1_arg.entries.entries_val[a]
132 char name[strlen (cbproc_entry(i)->zo_name)
133 + strlen (cbproc_entry(i)->zo_domain) + 3];
134 char *cp;
135
136 cp = stpcpy (name, cbproc_entry(i)->zo_name);
137 *cp++ = '.';
138 cp = stpcpy (cp, cbproc_entry(i)->zo_domain);
139
140 if ((data->callback) (name, cbproc_entry(i), data->userdata))
141 {
142 bool_result = TRUE;
143 data->nomore = 1;
144 data->result = NIS_SUCCESS;
145 break;
146 }
147 }
148 result = (char *) &bool_result;
149 }
150 break;
151 case CBPROC_FINISH:
152 xdr_argument = (xdrproc_t) xdr_void;
153 xdr_result = (xdrproc_t) xdr_void;
154 memset (s: &argument, c: 0, n: sizeof (argument));
155 if (!svc_getargs (transp, xdr_argument, (caddr_t) & argument))
156 {
157 svcerr_decode (xprt: transp);
158 return;
159 }
160 data->nomore = 1;
161 data->result = NIS_SUCCESS;
162 bool_result = TRUE; /* to make gcc happy, not necessary */
163 result = (char *) &bool_result;
164 break;
165 case CBPROC_ERROR:
166 xdr_argument = (xdrproc_t) _xdr_nis_error;
167 xdr_result = (xdrproc_t) xdr_void;
168 memset (s: &argument, c: 0, n: sizeof (argument));
169 if (!svc_getargs (transp, xdr_argument, (caddr_t) & argument))
170 {
171 svcerr_decode (xprt: transp);
172 return;
173 }
174 data->nomore = 1;
175 data->result = argument.cbproc_error_1_arg;
176 bool_result = TRUE; /* to make gcc happy, not necessary */
177 result = (char *) &bool_result;
178 break;
179 default:
180 svcerr_noproc (xprt: transp);
181 return;
182 }
183 if (result != NULL && !svc_sendreply (xprt: transp, xdr_results: xdr_result, xdr_location: result))
184 svcerr_systemerr (xprt: transp);
185 if (!svc_freeargs (transp, xdr_argument, (caddr_t) & argument))
186 {
187 fputs (_ ("unable to free arguments"), stderr);
188 exit (status: 1);
189 }
190 return;
191}
192
193static nis_error
194internal_nis_do_callback (struct dir_binding *bptr, netobj *cookie,
195 struct nis_cb *cb)
196{
197 struct timeval TIMEOUT = {25, 0};
198 bool_t cb_is_running;
199
200 data = cb;
201
202 for (;;)
203 {
204 struct pollfd my_pollfd[svc_max_pollfd];
205 int i;
206
207 if (svc_max_pollfd == 0 && svc_pollfd == NULL)
208 return NIS_CBERROR;
209
210 for (i = 0; i < svc_max_pollfd; ++i)
211 {
212 my_pollfd[i].fd = svc_pollfd[i].fd;
213 my_pollfd[i].events = svc_pollfd[i].events;
214 my_pollfd[i].revents = 0;
215 }
216
217 switch (i = TEMP_FAILURE_RETRY (__poll (my_pollfd, svc_max_pollfd,
218 25*1000)))
219 {
220 case -1:
221 return NIS_CBERROR;
222 case 0:
223 /* See if callback 'thread' in the server is still alive. */
224 cb_is_running = FALSE;
225 if (clnt_call (bptr->clnt, NIS_CALLBACK, (xdrproc_t) xdr_netobj,
226 (caddr_t) cookie, (xdrproc_t) xdr_bool,
227 (caddr_t) &cb_is_running, TIMEOUT) != RPC_SUCCESS)
228 cb_is_running = FALSE;
229
230 if (cb_is_running == FALSE)
231 {
232 syslog (LOG_ERR, fmt: "NIS+: callback timed out");
233 return NIS_CBERROR;
234 }
235 break;
236 default:
237 svc_getreq_poll (my_pollfd, i);
238 if (data->nomore)
239 return data->result;
240 }
241 }
242}
243
244nis_error
245__nis_do_callback (struct dir_binding *bptr, netobj *cookie,
246 struct nis_cb *cb)
247{
248 nis_error result;
249
250 __libc_lock_lock (callback);
251
252 result = internal_nis_do_callback (bptr, cookie, cb);
253
254 __libc_lock_unlock (callback);
255
256 return result;
257}
258
259struct nis_cb *
260__nis_create_callback (int (*callback) (const_nis_name, const nis_object *,
261 const void *),
262 const void *userdata, unsigned int flags)
263{
264 struct nis_cb *cb;
265 int sock = RPC_ANYSOCK;
266 struct sockaddr_in sin;
267 socklen_t len = sizeof (struct sockaddr_in);
268 unsigned short port;
269 int nomsg = 0;
270
271 cb = (struct nis_cb *) calloc (nmemb: 1,
272 size: sizeof (struct nis_cb) + sizeof (nis_server));
273 if (__glibc_unlikely (cb == NULL))
274 goto failed;
275 cb->serv = (nis_server *) (cb + 1);
276 cb->serv->name = strdup (s: nis_local_principal ());
277 if (__glibc_unlikely (cb->serv->name == NULL))
278 goto failed;
279 cb->serv->ep.ep_val = (endpoint *) calloc (nmemb: 2, size: sizeof (endpoint));
280 if (__glibc_unlikely (cb->serv->ep.ep_val == NULL))
281 goto failed;
282 cb->serv->ep.ep_len = 1;
283 cb->serv->ep.ep_val[0].family = strdup (s: "inet");
284 if (__glibc_unlikely (cb->serv->ep.ep_val[0].family == NULL))
285 goto failed;
286 cb->callback = callback;
287 cb->userdata = userdata;
288
289 if ((flags & NO_AUTHINFO) || !key_secretkey_is_set ())
290 {
291 cb->serv->key_type = NIS_PK_NONE;
292 cb->serv->pkey.n_bytes = NULL;
293 cb->serv->pkey.n_len = 0;
294 }
295 else
296 {
297#if 0
298 if ((cb->serv->pkey.n_bytes = __nis_getpkey (cb->serv->name)) == NULL)
299 {
300 cb->serv->pkey.n_len = 0;
301 cb->serv->key_type = NIS_PK_NONE;
302 }
303 else
304 {
305 cb->serv->key_type = NIS_PK_DH;
306 cb->serv->pkey.n_len = strlen(cb->serv->pkey.n_bytes);
307 }
308#else
309 cb->serv->pkey.n_len =0;
310 cb->serv->pkey.n_bytes = NULL;
311 cb->serv->key_type = NIS_PK_NONE;
312#endif
313 }
314
315 cb->serv->ep.ep_val[0].proto = strdup (s: (flags & USE_DGRAM) ? "udp" : "tcp");
316 if (__glibc_unlikely (cb->serv->ep.ep_val[0].proto == NULL))
317 goto failed;
318 cb->xprt = ((flags & USE_DGRAM)
319 ? svcudp_bufcreate (sock: sock, sendsz: 100, recvsz: 8192)
320 : svctcp_create (sock: sock, sendsize: 100, recvsize: 8192));
321 if (cb->xprt == NULL)
322 {
323 nomsg = 1;
324 goto failed;
325 }
326 cb->sock = cb->xprt->xp_sock;
327 if (!svc_register (xprt: cb->xprt, CB_PROG, CB_VERS, dispatch: cb_prog_1, protocol: 0))
328 {
329 xprt_unregister (xprt: cb->xprt);
330 svc_destroy (cb->xprt);
331 xdr_free (proc: (xdrproc_t) _xdr_nis_server, objp: (char *) cb->serv);
332 free (ptr: cb);
333 syslog (LOG_ERR, fmt: "NIS+: failed to register callback dispatcher");
334 return NULL;
335 }
336
337 if (getsockname (fd: cb->sock, addr: (struct sockaddr *) &sin, len: &len) == -1)
338 {
339 xprt_unregister (xprt: cb->xprt);
340 svc_destroy (cb->xprt);
341 xdr_free (proc: (xdrproc_t) _xdr_nis_server, objp: (char *) cb->serv);
342 free (ptr: cb);
343 syslog (LOG_ERR, fmt: "NIS+: failed to read local socket info");
344 return NULL;
345 }
346 port = ntohs (sin.sin_port);
347 get_myaddress (&sin);
348
349 if (asprintf (ptr: &cb->serv->ep.ep_val[0].uaddr, fmt: "%s.%d.%d",
350 inet_ntoa (in: sin.sin_addr), (port & 0xFF00) >> 8, port & 0x00FF)
351 < 0)
352 goto failed;
353
354 return cb;
355
356 failed:
357 if (cb)
358 {
359 if (cb->xprt)
360 svc_destroy (cb->xprt);
361 xdr_free (proc: (xdrproc_t) _xdr_nis_server, objp: (char *) cb->serv);
362 free (ptr: cb);
363 }
364 if (!nomsg)
365 syslog (LOG_ERR, fmt: "NIS+: out of memory allocating callback");
366 return NULL;
367}
368
369nis_error
370__nis_destroy_callback (struct nis_cb *cb)
371{
372 xprt_unregister (xprt: cb->xprt);
373 svc_destroy (cb->xprt);
374 close (fd: cb->sock);
375 xdr_free (proc: (xdrproc_t) _xdr_nis_server, objp: (char *) cb->serv);
376 free (ptr: cb);
377
378 return NIS_SUCCESS;
379}
380

source code of glibc/nis/nis_callback.c