1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22/*
23 * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
24 */
25
26/*
27 * Client-side interface to the IO Daemon (IOD)
28 */
29
30#include <errno.h>
31#include <fcntl.h>
32#include <stdio.h>
33#include <string.h>
34#include <stdlib.h>
35#include <unistd.h>
36#include <netdb.h>
37#include <libintl.h>
38#include <door.h>
39
40#include <sys/byteorder.h>
41#include <sys/types.h>
42#include <sys/fcntl.h>
43#include <sys/ioctl.h>
44#include <sys/time.h>
45#include <sys/socket.h>
46
47#include <netinet/in.h>
48#include <netinet/tcp.h>
49#include <arpa/inet.h>
50
51#include <netsmb/smb_lib.h>
52#include <netsmb/netbios.h>
53#include <netsmb/nb_lib.h>
54#include <netsmb/smb_dev.h>
55
56#include <assert.h>
57
58#include "charsets.h"
59#include "private.h"
60
61/*
62 * This is constant for the life of a process,
63 * and initialized at startup, so no locks.
64 */
65static char door_path[64];
66static int iod_start_timeout = 10;	/* seconds */
67
68char *
69smb_iod_door_path(void)
70{
71	uid_t uid;
72	int x;
73
74	if (door_path[0] == '\0') {
75		uid = getuid();
76		x = snprintf(door_path, sizeof (door_path),
77		    SMBIOD_USR_DOOR, uid);
78		assert(x <= sizeof (door_path));
79	}
80
81	return (door_path);
82}
83
84/*
85 * Open the door (client side) and
86 * find out if the service is there.
87 */
88int
89smb_iod_open_door(int *fdp)
90{
91	door_arg_t da;
92	char *path;
93	int fd, rc;
94	int err = 0;
95
96	path = smb_iod_door_path();
97	fd = open(path, O_RDONLY, 0);
98	if (fd < 0)
99		return (errno);
100
101	/*
102	 * Make sure the IOD is running.
103	 * Pass NULL args.
104	 */
105	memset(&da, 0, sizeof (da));
106	da.rbuf = (void *) &err;
107	da.rsize = sizeof (err);
108	rc = door_call(fd, &da);
109	if (rc < 0) {
110		err = errno;
111		close(fd);
112		return (err);
113	}
114	if (err != 0) {
115		close(fd);
116		return (err);
117	}
118
119	/* This handle controls per-process resources. */
120	(void) fcntl(fd, F_SETFD, FD_CLOEXEC);
121
122	*fdp = fd;
123	return (0);
124}
125
126/*
127 * Request the creation of our per-user smbiod
128 * via door call to the "main" IOD service.
129 */
130static int
131start_iod(void)
132{
133	const char *svc_door = SMBIOD_SVC_DOOR;
134	door_arg_t da;
135	int32_t cmd, err;
136	int fd, rc;
137
138	fd = open(svc_door, O_RDONLY, 0);
139	if (fd < 0) {
140		err = errno;
141		DPRINT("%s: open failed, err %d", svc_door, err);
142		return (err);
143	}
144	cmd = SMBIOD_START;
145	memset(&da, 0, sizeof (da));
146	da.data_ptr = (void *) &cmd;
147	da.data_size = sizeof (cmd);
148	da.rbuf = (void *) &err;
149	da.rsize = sizeof (err);
150	rc = door_call(fd, &da);
151	close(fd);
152	if (rc < 0) {
153		err = errno;
154		DPRINT("door_call, err %d", err);
155		return (err);
156	}
157
158	return (err);
159}
160
161/*
162 * Get a door handle to the IOD, starting it if necessary.
163 * On success, sets ctx->ct_door_fd
164 */
165int
166smb_iod_start(smb_ctx_t *ctx)
167{
168	int err, tmo;
169	int fd = -1;
170
171	tmo = iod_start_timeout;
172	while ((err = smb_iod_open_door(&fd)) != 0) {
173		if (--tmo <= 0)
174			goto errout;
175
176		/*
177		 * We have no per-user IOD yet.  Request one.
178		 * Do this request every time through the loop
179		 * because the master IOD will only start our
180		 * per-user IOD if we don't have one, and our
181		 * first requst could have happened while we
182		 * had an IOD that was doing shutdown.
183		 * (Prevents a shutdown/startup race).
184		 */
185		err = start_iod();
186		if (err != 0)
187			goto errout;
188		/*
189		 * Wait for it to get ready.
190		 */
191		(void) sleep(1);
192	}
193
194	/* Save the door fd. */
195	if (ctx->ct_door_fd != -1)
196		close(ctx->ct_door_fd);
197	ctx->ct_door_fd = fd;
198
199	return (0);
200
201errout:
202	smb_error(dgettext(TEXT_DOMAIN,
203	    "Could not contact service: %s"),
204	    0, "svc:/network/smb/client");
205	return (ENOTACTIVE);
206}
207
208/*
209 * Ask the IOD to connect using the info in ctx.
210 * Called by newvc.
211 */
212int
213smb_iod_cl_newvc(smb_ctx_t *ctx)
214{
215	door_arg_t da;
216	int err = 0;
217
218	/* Should already have the IOD door. */
219	if (ctx->ct_door_fd < 0)
220		return (EINVAL);
221
222	da.data_ptr = (void *) &ctx->ct_iod_ssn;
223	da.data_size = sizeof (ctx->ct_iod_ssn);
224	da.desc_ptr = NULL;
225	da.desc_num = 0;
226	da.rbuf = (void *) &err;
227	da.rsize = sizeof (err);
228	if (door_call(ctx->ct_door_fd, &da) < 0) {
229		err = errno;
230		DPRINT("door_call, err=%d", err);
231	}
232
233	return (err);
234}
235