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, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 *
26 * Stuff relating to directory reading ...
27 */
28
29 #include <rpc/types.h>
30 #include <rpc/auth.h>
31 #include <rpc/xdr.h>
32 #include "clnt.h"
33 #include <rpc/rpc_msg.h>
34 #include <sys/t_lock.h>
35 #include "nfs_inet.h"
36 #include <rpc/rpc.h>
37 #include "brpc.h"
38 #include <rpcsvc/nfs_prot.h>
39 #include <sys/types.h>
40 #include <sys/stat.h>
41 #include <sys/bootvfs.h>
42 #include <sys/sysmacros.h>
43 #include "socket_inet.h"
44 #include <sys/salib.h>
45 #include <sys/bootdebug.h>
46
47 #define MAXDENTS 16
48 #define MINSIZ 20
49
50 /*
51 * Boot needs to be cleaned up to use either dirent32 or dirent64,
52 * in the meantime use dirent_t and always round to 8 bytes
53 */
54 #define BDIRENT_RECLEN(namelen) \
55 ((offsetof(dirent_t, d_name[0]) + 1 + (namelen) + 7) & ~ 7)
56
57 #define dprintf if (boothowto & RB_DEBUG) printf
58
59 /*
60 * Get directory entries:
61 *
62 * Uses the nfs "READDIR" operation to read directory entries
63 * into a local buffer. These are then translated into file
64 * system independent "dirent" structs and returned in the
65 * caller's buffer. Returns the number of entries converted
66 * (-1 if there's an error).
67 *
68 * Although the xdr functions can allocate memory, we have
69 * a limited heap so we allocate our own space,
70 * assuming the worst case of 256 byte names.
71 * This is a space hog in our local buffer, so we want
72 * the number of buffers to be small. To make sure we don't
73 * get more names than we can handle, we tell the rpc
74 * routine that we only have space for MAXDENT names if
75 * they are all the minimum size. This keeps the return
76 * packet unfragmented, but may result in lots of reads
77 * to process a large directory. Since this is standalone
78 * we don't worry about speed. With MAXDENTs at 16, the
79 * local buffer is 4k.
80 */
81
82 int
nfsgetdents(struct nfs_file * nfp,struct dirent * dep,unsigned size)83 nfsgetdents(struct nfs_file *nfp, struct dirent *dep, unsigned size)
84 {
85 entry *ep;
86 readdirargs rda;
87 readdirres res;
88 enum clnt_stat status;
89 struct {
90 entry etlist[MAXDENTS];
91 char names[MAXDENTS][NFS_MAXNAMLEN+1];
92 } rdbuf;
93 uint32_t offset;
94 int j, cnt = 0;
95 struct timeval zero_timeout = {0, 0}; /* default */
96
97 bzero((caddr_t)&res, sizeof (res));
98 bzero((caddr_t)&rda, sizeof (rda));
99 bzero((caddr_t)rdbuf.etlist, sizeof (rdbuf.etlist));
100 bcopy((caddr_t)&nfp->fh.fh2, (caddr_t)&rda.dir, NFS_FHSIZE);
101 bcopy((caddr_t)nfp->cookie.cookie2, (caddr_t)rda.cookie,
102 sizeof (nfscookie));
103
104 while (!res.readdirres_u.reply.eof) {
105 /*
106 * Keep issuing nfs calls until EOF is reached on
107 * the directory or the user buffer is filled.
108 */
109
110 for (j = 0; j < MAXDENTS; j++) {
111 /*
112 * Link our buffers together for the benefit of
113 * XDR. We do this each time we issue the rpc call
114 * JIC the xdr decode
115 * routines screw up the linkage!
116 */
117
118 rdbuf.etlist[j].name = rdbuf.names[(MAXDENTS-1) - j];
119 rdbuf.etlist[j].nextentry =
120 (j < (MAXDENTS-1)) ? &rdbuf.etlist[j+1] : 0;
121 }
122
123 res.readdirres_u.reply.entries = rdbuf.etlist;
124 /*
125 * Cannot give the whole buffer unless every name is
126 * 256 bytes! Assume the worst case of all 1 byte names.
127 * This results in MINSIZ bytes/name in the xdr stream.
128 */
129 rda.count = sizeof (res) + MAXDENTS*MINSIZ;
130 bzero((caddr_t)rdbuf.names, sizeof (rdbuf.names));
131
132 status = CLNT_CALL(root_CLIENT, NFSPROC_READDIR,
133 xdr_readdirargs, (caddr_t)&rda,
134 xdr_readdirres, (caddr_t)&res, zero_timeout);
135
136 if (status != RPC_SUCCESS) {
137 dprintf("nfs_getdents: RPC error\n");
138 return (-1);
139 }
140 if (res.status != NFS_OK) {
141 /*
142 * The most common failure here would be trying to
143 * issue a getdents call on a non-directory!
144 */
145
146 nfs_error(res.status);
147 return (-1);
148 }
149
150 for (ep = rdbuf.etlist; ep; ep = ep->nextentry) {
151 /*
152 * Step thru all entries returned by NFS, converting
153 * to the cannonical form and copying out to the
154 * user's buffer.
155 */
156
157 int n;
158
159 /*
160 * catch the case user called at EOF
161 */
162 if ((n = strlen(ep->name)) == 0)
163 return (cnt);
164
165 n = BDIRENT_RECLEN(n);
166
167 if (n > size)
168 return (cnt);
169 size -= n;
170
171 (void) strlcpy(dep->d_name, ep->name,
172 strlen(ep->name) + 1);
173 dep->d_ino = ep->fileid;
174 bcopy(ep->cookie, &offset, sizeof (nfscookie));
175 dep->d_off = offset;
176 dep->d_reclen = (ushort_t)n;
177
178 dep = (struct dirent *)((char *)dep + n);
179 bcopy(ep->cookie, rda.cookie, sizeof (nfscookie));
180 bcopy(ep->cookie, nfp->cookie.cookie2,
181 sizeof (nfscookie));
182 cnt++;
183 }
184 }
185
186 return (cnt);
187 }
188