aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/libs/openldap/libraries/libldap/os-local.c
blob: 8b310309573e36b726141c75bf420320094f5d60 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
/* os-local.c -- platform-specific domain socket code */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
 *
 * Copyright 1998-2022 The OpenLDAP Foundation.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted only as authorized by the OpenLDAP
 * Public License.
 *
 * A copy of this license is available in the file LICENSE in the
 * top-level directory of the distribution or, alternatively, at
 * <http://www.OpenLDAP.org/license.html>.
 */
/* Portions Copyright (c) 1995 Regents of the University of Michigan.
 * All rights reserved. 
 */
/* Portions (C) Copyright PADL Software Pty Ltd. 1999
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that this notice is preserved
 * and that due credit is given to PADL Software Pty Ltd. This software
 * is provided ``as is'' without express or implied warranty.  
 */

#include "portable.h"

#ifdef LDAP_PF_LOCAL

#include <stdio.h>

#include <ac/stdlib.h>

#include <ac/errno.h>
#include <ac/socket.h>
#include <ac/string.h>
#include <ac/time.h>
#include <ac/unistd.h>

#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_SYS_UIO_H
#include <sys/uio.h>
#endif

#ifdef HAVE_IO_H
#include <io.h>
#endif /* HAVE_IO_H */
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif

#include "ldap-int.h"
#include "ldap_defaults.h"

static void
ldap_pvt_set_errno(int err)
{
	errno = err;
}

static int
ldap_pvt_ndelay_on(LDAP *ld, int fd)
{
	Debug1(LDAP_DEBUG_TRACE, "ldap_ndelay_on: %d\n",fd );
	return ber_pvt_socket_set_nonblock( fd, 1 );
}
   
static int
ldap_pvt_ndelay_off(LDAP *ld, int fd)
{
	Debug1(LDAP_DEBUG_TRACE, "ldap_ndelay_off: %d\n",fd );
	return ber_pvt_socket_set_nonblock( fd, 0 );
}

static ber_socket_t
ldap_pvt_socket(LDAP *ld)
{
	ber_socket_t s = socket(PF_LOCAL, SOCK_STREAM, 0);
	Debug1(LDAP_DEBUG_TRACE, "ldap_new_socket: %d\n",s );
#ifdef FD_CLOEXEC
	fcntl(s, F_SETFD, FD_CLOEXEC);
#endif
	return ( s );
}

static int
ldap_pvt_close_socket(LDAP *ld, int s)
{
	Debug1(LDAP_DEBUG_TRACE, "ldap_close_socket: %d\n",s );
	return tcp_close(s);
}

#undef TRACE
#define TRACE do { \
	char ebuf[128]; \
	int saved_errno = errno; \
	Debug3(LDAP_DEBUG_TRACE, "ldap_is_socket_ready: error on socket %d: errno: %d (%s)\n", \
		s, \
		saved_errno, \
		AC_STRERROR_R(saved_errno, ebuf, sizeof ebuf)); \
} while( 0 )

/*
 * check the socket for errors after select returned.
 */
static int
ldap_pvt_is_socket_ready(LDAP *ld, int s)
{
	Debug1(LDAP_DEBUG_TRACE, "ldap_is_sock_ready: %d\n",s );

#if defined( notyet ) /* && defined( SO_ERROR ) */
{
	int so_errno;
	ber_socklen_t dummy = sizeof(so_errno);
	if ( getsockopt( s, SOL_SOCKET, SO_ERROR, &so_errno, &dummy )
		== AC_SOCKET_ERROR )
	{
		return -1;
	}
	if ( so_errno ) {
		ldap_pvt_set_errno(so_errno);
		TRACE;
		return -1;
	}
	return 0;
}
#else
{
	/* error slippery */
	struct sockaddr_un sa;
	char ch;
	ber_socklen_t dummy = sizeof(sa);
	if ( getpeername( s, (struct sockaddr *) &sa, &dummy )
		== AC_SOCKET_ERROR )
	{
		/* XXX: needs to be replace with ber_stream_read() */
		(void)read(s, &ch, 1);
		TRACE;
		return -1;
	}
	return 0;
}
#endif
	return -1;
}
#undef TRACE

#ifdef LDAP_PF_LOCAL_SENDMSG
static const char abandonPDU[] = {LDAP_TAG_MESSAGE, 6,
	LDAP_TAG_MSGID, 1, 0, LDAP_REQ_ABANDON, 1, 0};
#endif

static int
ldap_pvt_connect(LDAP *ld, ber_socket_t s, struct sockaddr_un *sa, int async)
{
	int rc;
	struct timeval	tv, *opt_tv = NULL;

	if ( ld->ld_options.ldo_tm_net.tv_sec >= 0 ) {
		tv = ld->ld_options.ldo_tm_net;
		opt_tv = &tv;
	}

	Debug3(LDAP_DEBUG_TRACE,
		"ldap_connect_timeout: fd: %d tm: %ld async: %d\n",
		s, opt_tv ? tv.tv_sec : -1L, async);

	if ( ldap_pvt_ndelay_on(ld, s) == -1 ) return -1;

	if ( connect(s, (struct sockaddr *) sa, sizeof(struct sockaddr_un))
		!= AC_SOCKET_ERROR )
	{
		if ( ldap_pvt_ndelay_off(ld, s) == -1 ) return -1;

#ifdef LDAP_PF_LOCAL_SENDMSG
	/* Send a dummy message with access rights. Remote side will
	 * obtain our uid/gid by fstat'ing this descriptor. The
	 * descriptor permissions must match exactly, and we also
	 * send the socket name, which must also match.
	 */
sendcred:
		{
			int fds[2];
			ber_socklen_t salen = sizeof(*sa);
			if (pipe(fds) == 0) {
				/* Abandon, noop, has no reply */
				struct iovec iov;
				struct msghdr msg = {0};
# ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL
# ifndef CMSG_SPACE
# define CMSG_SPACE(len)	(_CMSG_ALIGN( sizeof(struct cmsghdr)) + _CMSG_ALIGN(len) )
# endif
# ifndef CMSG_LEN
# define CMSG_LEN(len)		(_CMSG_ALIGN( sizeof(struct cmsghdr)) + (len) )
# endif
				union {
					struct cmsghdr cm;
					unsigned char control[CMSG_SPACE(sizeof(int))];
				} control_un;
				struct cmsghdr *cmsg;
# endif /* HAVE_STRUCT_MSGHDR_MSG_CONTROL */
				msg.msg_name = NULL;
				msg.msg_namelen = 0;
				iov.iov_base = (char *) abandonPDU;
				iov.iov_len = sizeof abandonPDU;
				msg.msg_iov = &iov;
				msg.msg_iovlen = 1;
# ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL
				msg.msg_control = control_un.control;
				msg.msg_controllen = sizeof( control_un.control );
				msg.msg_flags = 0;

				cmsg = CMSG_FIRSTHDR( &msg );
				cmsg->cmsg_len = CMSG_LEN( sizeof(int) );
				cmsg->cmsg_level = SOL_SOCKET;
				cmsg->cmsg_type = SCM_RIGHTS;

				*((int *)CMSG_DATA(cmsg)) = fds[0];
# else
				msg.msg_accrights = (char *)fds;
				msg.msg_accrightslen = sizeof(int);
# endif /* HAVE_STRUCT_MSGHDR_MSG_CONTROL */
				getpeername( s, (struct sockaddr *) sa, &salen );
				fchmod( fds[0], S_ISUID|S_IRWXU );
				write( fds[1], sa, salen );
				sendmsg( s, &msg, 0 );
				close(fds[0]);
				close(fds[1]);
			}
		}
#endif
		return 0;
	}

	if ( errno != EINPROGRESS && errno != EWOULDBLOCK ) return -1;
	
#ifdef notyet
	if ( async ) return -2;
#endif

#ifdef HAVE_POLL
	{
		struct pollfd fd;
		int timeout = INFTIM;

		if( opt_tv != NULL ) timeout = TV2MILLISEC( &tv );

		fd.fd = s;
		fd.events = POLL_WRITE;

		do {
			fd.revents = 0;
			rc = poll( &fd, 1, timeout );
		} while( rc == AC_SOCKET_ERROR && errno == EINTR &&
			LDAP_BOOL_GET(&ld->ld_options, LDAP_BOOL_RESTART ));

		if( rc == AC_SOCKET_ERROR ) return rc;

		if( fd.revents & POLL_WRITE ) {
			if ( ldap_pvt_is_socket_ready(ld, s) == -1 ) return -1;
			if ( ldap_pvt_ndelay_off(ld, s) == -1 ) return -1;
#ifdef LDAP_PF_LOCAL_SENDMSG
			goto sendcred;
#else
			return ( 0 );
#endif
		}
	}
#else
	{
		fd_set wfds, *z=NULL;

#ifdef FD_SETSIZE
		if ( s >= FD_SETSIZE ) {
			rc = AC_SOCKET_ERROR;
			tcp_close( s );
			ldap_pvt_set_errno( EMFILE );
			return rc;
		}
#endif
		do { 
			FD_ZERO(&wfds);
			FD_SET(s, &wfds );
			rc = select( ldap_int_tblsize, z, &wfds, z, opt_tv ? &tv : NULL );
		} while( rc == AC_SOCKET_ERROR && errno == EINTR &&
			LDAP_BOOL_GET(&ld->ld_options, LDAP_BOOL_RESTART ));

		if( rc == AC_SOCKET_ERROR ) return rc;

		if ( FD_ISSET(s, &wfds) ) {
			if ( ldap_pvt_is_socket_ready(ld, s) == -1 ) return -1;
			if ( ldap_pvt_ndelay_off(ld, s) == -1 ) return -1;
#ifdef LDAP_PF_LOCAL_SENDMSG
			goto sendcred;
#else
			return ( 0 );
#endif
		}
	}
#endif

	Debug0(LDAP_DEBUG_TRACE, "ldap_connect_timeout: timed out\n" );
	ldap_pvt_set_errno( ETIMEDOUT );
	return ( -1 );
}

int
ldap_connect_to_path(LDAP *ld, Sockbuf *sb, LDAPURLDesc *srv, int async)
{
	struct sockaddr_un	server;
	ber_socket_t		s;
	int			rc;
	const char *path = srv->lud_host;

	Debug0(LDAP_DEBUG_TRACE, "ldap_connect_to_path\n" );

	if ( path == NULL || path[0] == '\0' ) {
		path = LDAPI_SOCK;
	} else {
		if ( strlen(path) > (sizeof( server.sun_path ) - 1) ) {
			ldap_pvt_set_errno( ENAMETOOLONG );
			return -1;
		}
	}

	s = ldap_pvt_socket( ld );
	if ( s == AC_SOCKET_INVALID ) {
		return -1;
	}

	Debug1(LDAP_DEBUG_TRACE, "ldap_connect_to_path: Trying %s\n", path );

	memset( &server, '\0', sizeof(server) );
	server.sun_family = AF_LOCAL;
	strcpy( server.sun_path, path );

	rc = ldap_pvt_connect(ld, s, &server, async);

	if (rc == 0) {
		rc = ldap_int_connect_cbs( ld, sb, &s, srv, (struct sockaddr *)&server );
	}
	if ( rc ) {
		ldap_pvt_close_socket(ld, s);
	}
	return rc;
}
#else
static int dummy; /* generate also a warning: 'dummy' defined but not used (at least here) */
#endif /* LDAP_PF_LOCAL */