1*fc978808Schristos /* $NetBSD: icfs.c,v 1.11 2008/09/12 14:40:46 christos Exp $ */
2eb83bd6cSpooka
3eb83bd6cSpooka /*
4eb83bd6cSpooka * Copyright (c) 2007 Antti Kantee. All Rights Reserved.
5eb83bd6cSpooka *
6eb83bd6cSpooka * Redistribution and use in source and binary forms, with or without
7eb83bd6cSpooka * modification, are permitted provided that the following conditions
8eb83bd6cSpooka * are met:
9eb83bd6cSpooka * 1. Redistributions of source code must retain the above copyright
10eb83bd6cSpooka * notice, this list of conditions and the following disclaimer.
11eb83bd6cSpooka * 2. Redistributions in binary form must reproduce the above copyright
12eb83bd6cSpooka * notice, this list of conditions and the following disclaimer in the
13eb83bd6cSpooka * documentation and/or other materials provided with the distribution.
14eb83bd6cSpooka *
15eb83bd6cSpooka * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
16eb83bd6cSpooka * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
17eb83bd6cSpooka * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18eb83bd6cSpooka * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19eb83bd6cSpooka * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20eb83bd6cSpooka * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21eb83bd6cSpooka * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22eb83bd6cSpooka * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23eb83bd6cSpooka * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24eb83bd6cSpooka * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25eb83bd6cSpooka * SUCH DAMAGE.
26eb83bd6cSpooka */
27eb83bd6cSpooka
28eb83bd6cSpooka /*
29eb83bd6cSpooka * icfs: layer everything in lowercase
30eb83bd6cSpooka * (unfinished, as is probably fairly easy to tell)
31eb83bd6cSpooka *
32eb83bd6cSpooka * Now, this "layered" file system demostrates a nice gotcha with
33eb83bd6cSpooka * mangling readdir entries. In case we can't unmangle the name
34eb83bd6cSpooka * (cf. rot13fs), we need to map the mangled name back to the real
35eb83bd6cSpooka * name in lookup and store the actual lower layer name instead of
36eb83bd6cSpooka * the mangled name.
37eb83bd6cSpooka *
385662e7f7Spooka * This is mounted without namecache. Otherwise we might have
395662e7f7Spooka * two different nodes for e.g. FoO and foo. It might be possible
405662e7f7Spooka * support name cache by having all namespace-altering operations
415662e7f7Spooka * flush the directory namecache ...
42eb83bd6cSpooka */
43eb83bd6cSpooka
44eb83bd6cSpooka #include <sys/types.h>
45eb83bd6cSpooka
46eb83bd6cSpooka #include <assert.h>
47eb83bd6cSpooka #include <ctype.h>
48eb83bd6cSpooka #include <dirent.h>
49eb83bd6cSpooka #include <err.h>
50eb83bd6cSpooka #include <errno.h>
51eb83bd6cSpooka #include <puffs.h>
52eb83bd6cSpooka #include <stdio.h>
53eb83bd6cSpooka #include <stdlib.h>
54eb83bd6cSpooka #include <unistd.h>
55eb83bd6cSpooka
56eb83bd6cSpooka PUFFSOP_PROTOS(ic)
57eb83bd6cSpooka
58eb83bd6cSpooka static void usage(void);
59eb83bd6cSpooka
60eb83bd6cSpooka static void
usage()61eb83bd6cSpooka usage()
62eb83bd6cSpooka {
63eb83bd6cSpooka
64*fc978808Schristos errx(1, "usage: %s [-sp] [-o mntopts] icfs mountpath",
65eb83bd6cSpooka getprogname());
66eb83bd6cSpooka }
67eb83bd6cSpooka
68eb83bd6cSpooka static void
dotolower(char * buf,size_t buflen)69eb83bd6cSpooka dotolower(char *buf, size_t buflen)
70eb83bd6cSpooka {
71eb83bd6cSpooka
72eb83bd6cSpooka while (buflen--) {
7339542808Spooka *buf = tolower((unsigned char)*buf);
74eb83bd6cSpooka buf++;
75eb83bd6cSpooka }
76eb83bd6cSpooka }
77eb83bd6cSpooka
78eb83bd6cSpooka static int
icpathcmp(struct puffs_usermount * pu,struct puffs_pathobj * c1,struct puffs_pathobj * c2,size_t clen,int checkprefix)79eb83bd6cSpooka icpathcmp(struct puffs_usermount *pu, struct puffs_pathobj *c1,
80eb83bd6cSpooka struct puffs_pathobj *c2, size_t clen, int checkprefix)
81eb83bd6cSpooka {
82eb83bd6cSpooka struct puffs_pathobj *po_root;
83eb83bd6cSpooka char *cp1, *cp2;
84eb83bd6cSpooka size_t rplen;
85eb83bd6cSpooka
86eb83bd6cSpooka po_root = puffs_getrootpathobj(pu);
87eb83bd6cSpooka rplen = po_root->po_len;
88eb83bd6cSpooka
89eb83bd6cSpooka assert(clen >= rplen);
90eb83bd6cSpooka
91eb83bd6cSpooka cp1 = c1->po_path;
92eb83bd6cSpooka cp2 = c2->po_path;
93eb83bd6cSpooka
94eb83bd6cSpooka if (strncasecmp(cp1 + rplen, cp2 + rplen, clen - rplen) != 0)
95eb83bd6cSpooka return 1;
96eb83bd6cSpooka
97eb83bd6cSpooka if (checkprefix == 0)
98eb83bd6cSpooka return 0;
99eb83bd6cSpooka
100eb83bd6cSpooka if (c1->po_len < c2->po_len)
101eb83bd6cSpooka return 1;
102eb83bd6cSpooka
103eb83bd6cSpooka if (*(cp1 + clen) != '/')
104eb83bd6cSpooka return 1;
105eb83bd6cSpooka
106eb83bd6cSpooka return 0;
107eb83bd6cSpooka }
108eb83bd6cSpooka
109eb83bd6cSpooka static int
icpathxform(struct puffs_usermount * pu,const struct puffs_pathobj * po_base,const struct puffs_cn * pcn,struct puffs_pathobj * po_new)110eb83bd6cSpooka icpathxform(struct puffs_usermount *pu, const struct puffs_pathobj *po_base,
111eb83bd6cSpooka const struct puffs_cn *pcn, struct puffs_pathobj *po_new)
112eb83bd6cSpooka {
113eb83bd6cSpooka struct dirent entry, *result;
114eb83bd6cSpooka char *src;
115eb83bd6cSpooka size_t srclen;
116eb83bd6cSpooka DIR *dp;
117eb83bd6cSpooka
118eb83bd6cSpooka dp = opendir(po_base->po_path);
119eb83bd6cSpooka if (dp == NULL)
120eb83bd6cSpooka return errno;
121eb83bd6cSpooka
122eb83bd6cSpooka src = pcn->pcn_name;
123eb83bd6cSpooka srclen = pcn->pcn_namelen;
124eb83bd6cSpooka for (;;) {
125eb83bd6cSpooka if (readdir_r(dp, &entry, &result) != 0)
126eb83bd6cSpooka break;
127eb83bd6cSpooka if (!result)
128eb83bd6cSpooka break;
129eb83bd6cSpooka if (strcasecmp(result->d_name, pcn->pcn_name) == 0) {
130eb83bd6cSpooka src = result->d_name;
131eb83bd6cSpooka srclen = strlen(result->d_name);
132eb83bd6cSpooka break;
133eb83bd6cSpooka }
134eb83bd6cSpooka }
135eb83bd6cSpooka
136eb83bd6cSpooka po_new->po_path = strdup(src);
137eb83bd6cSpooka po_new->po_len = srclen;
138eb83bd6cSpooka closedir(dp);
139eb83bd6cSpooka
140eb83bd6cSpooka return 0;
141eb83bd6cSpooka }
142eb83bd6cSpooka
143eb83bd6cSpooka int
main(int argc,char * argv[])144eb83bd6cSpooka main(int argc, char *argv[])
145eb83bd6cSpooka {
146eb83bd6cSpooka struct puffs_usermount *pu;
147eb83bd6cSpooka struct puffs_ops *pops;
148eb83bd6cSpooka struct puffs_pathobj *po_root;
149eb83bd6cSpooka struct puffs_node *pn_root;
150eb83bd6cSpooka struct stat sb;
151eb83bd6cSpooka mntoptparse_t mp;
1524b0f2948Spooka int mntflags, pflags;
1535ed3fcdaSpooka int detach, dpres;
154eb83bd6cSpooka int ch;
155eb83bd6cSpooka
156eb83bd6cSpooka setprogname(argv[0]);
157eb83bd6cSpooka
158eb83bd6cSpooka if (argc < 3)
159eb83bd6cSpooka usage();
160eb83bd6cSpooka
1615ed3fcdaSpooka pflags = mntflags = dpres = 0;
1624b0f2948Spooka detach = 1;
1635ed3fcdaSpooka while ((ch = getopt(argc, argv, "o:sp")) != -1) {
164eb83bd6cSpooka switch (ch) {
165eb83bd6cSpooka case 'o':
166eb83bd6cSpooka mp = getmntopts(optarg, puffsmopts, &mntflags, &pflags);
167eb83bd6cSpooka if (mp == NULL)
168eb83bd6cSpooka err(1, "getmntopts");
169eb83bd6cSpooka freemntopts(mp);
170eb83bd6cSpooka break;
1715ed3fcdaSpooka case 'p':
1725ed3fcdaSpooka dpres = 1;
1735ed3fcdaSpooka break;
174eb83bd6cSpooka case 's':
1754b0f2948Spooka detach = 0;
176eb83bd6cSpooka break;
177eb83bd6cSpooka }
178eb83bd6cSpooka }
179eb83bd6cSpooka pflags |= PUFFS_FLAG_BUILDPATH;
1805662e7f7Spooka pflags |= PUFFS_KFLAG_NOCACHE_NAME;
181eb83bd6cSpooka argv += optind;
182eb83bd6cSpooka argc -= optind;
183eb83bd6cSpooka
184eb83bd6cSpooka if (pflags & PUFFS_FLAG_OPDUMP)
1854b0f2948Spooka detach = 0;
186eb83bd6cSpooka
187eb83bd6cSpooka if (argc != 2)
188eb83bd6cSpooka usage();
189eb83bd6cSpooka
190eb83bd6cSpooka if (lstat(argv[0], &sb) == -1)
191eb83bd6cSpooka err(1, "stat %s", argv[0]);
192eb83bd6cSpooka if ((sb.st_mode & S_IFDIR) == 0)
193eb83bd6cSpooka errx(1, "%s is not a directory", argv[0]);
194eb83bd6cSpooka
195eb83bd6cSpooka PUFFSOP_INIT(pops);
1960d05db1cSpooka puffs_null_setops(pops);
197eb83bd6cSpooka
1985ed3fcdaSpooka if (dpres == 0)
199eb83bd6cSpooka PUFFSOP_SET(pops, ic, node, readdir);
200eb83bd6cSpooka
20108db7d75Spooka if ((pu = puffs_init(pops, argv[0], "ic", NULL, pflags)) == NULL)
202eb83bd6cSpooka err(1, "mount");
203eb83bd6cSpooka
204eb83bd6cSpooka pn_root = puffs_pn_new(pu, NULL);
205eb83bd6cSpooka if (pn_root == NULL)
206eb83bd6cSpooka err(1, "puffs_pn_new");
207eb83bd6cSpooka puffs_setroot(pu, pn_root);
208eb83bd6cSpooka
209eb83bd6cSpooka po_root = puffs_getrootpathobj(pu);
210eb83bd6cSpooka if (po_root == NULL)
211eb83bd6cSpooka err(1, "getrootpathobj");
212eb83bd6cSpooka po_root->po_path = argv[0];
213eb83bd6cSpooka po_root->po_len = strlen(argv[0]);
214eb83bd6cSpooka puffs_stat2vattr(&pn_root->pn_va, &sb);
215eb83bd6cSpooka
216eb83bd6cSpooka puffs_set_pathcmp(pu, icpathcmp);
217eb83bd6cSpooka puffs_set_pathtransform(pu, icpathxform);
218eb83bd6cSpooka
2194b0f2948Spooka if (detach)
2204462e945Spooka if (puffs_daemon(pu, 1, 1) == -1)
2214462e945Spooka err(1, "puffs_daemon");
2224b0f2948Spooka
223ec865a5bSpooka if (puffs_mount(pu, argv[1], mntflags, pn_root) == -1)
224ec865a5bSpooka err(1, "puffs_mount");
2254b0f2948Spooka if (puffs_mainloop(pu) == -1)
226ec865a5bSpooka err(1, "mainloop");
2274b0f2948Spooka
2284b0f2948Spooka return 0;
229eb83bd6cSpooka }
230eb83bd6cSpooka
231eb83bd6cSpooka int
ic_node_readdir(struct puffs_usermount * pu,void * opc,struct dirent * dent,off_t * readoff,size_t * reslen,const struct puffs_cred * pcr,int * eofflag,off_t * cookies,size_t * ncookies)23221913eabSpooka ic_node_readdir(struct puffs_usermount *pu, void *opc, struct dirent *dent,
233eb83bd6cSpooka off_t *readoff, size_t *reslen, const struct puffs_cred *pcr,
234eb83bd6cSpooka int *eofflag, off_t *cookies, size_t *ncookies)
235eb83bd6cSpooka {
236eb83bd6cSpooka struct dirent *dp;
237eb83bd6cSpooka size_t rl;
238eb83bd6cSpooka int rv;
239eb83bd6cSpooka
240eb83bd6cSpooka dp = dent;
241eb83bd6cSpooka rl = *reslen;
242eb83bd6cSpooka
24321913eabSpooka rv = puffs_null_node_readdir(pu, opc, dent, readoff, reslen, pcr,
244eb83bd6cSpooka eofflag, cookies, ncookies);
245eb83bd6cSpooka if (rv)
246eb83bd6cSpooka return rv;
247eb83bd6cSpooka
248eb83bd6cSpooka while (rl > *reslen) {
249eb83bd6cSpooka dotolower(dp->d_name, dp->d_namlen);
250eb83bd6cSpooka rl -= _DIRENT_SIZE(dp);
251eb83bd6cSpooka dp = _DIRENT_NEXT(dp);
252eb83bd6cSpooka }
253eb83bd6cSpooka
254eb83bd6cSpooka return 0;
255eb83bd6cSpooka }
256