rot13fs.c revision 1.2
1 /* $NetBSD: rot13fs.c,v 1.2 2007/02/15 12:54:24 pooka Exp $ */ 2 3 /* 4 * Copyright (c) 2007 Antti Kantee. All Rights Reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the company nor the name of the author may be used to 15 * endorse or promote products derived from this software without specific 16 * prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 19 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 21 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 /* 32 * rot13fs: puffs layering experiment 33 * (unfinished, as is probably fairly easy to tell) 34 */ 35 36 #include <err.h> 37 #include <errno.h> 38 #include <puffs.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <unistd.h> 42 43 PUFFSOP_PROTOS(puffs_null) /* XXX */ 44 PUFFSOP_PROTOS(rot13) 45 46 static void usage(void); 47 48 static void 49 usage() 50 { 51 52 errx(1, "usage: %s [-s][-o mntopts]rot13path mountpath", 53 getprogname()); 54 } 55 56 static uint8_t tbl[256]; 57 58 static void 59 dorot13(void *buf, size_t buflen) 60 { 61 uint8_t *b = buf; 62 63 while (buflen--) { 64 *b = tbl[*b]; 65 b++; 66 } 67 } 68 69 static int 70 rot13path(struct puffs_usermount *pu, struct puffs_pathobj *base, 71 struct puffs_cn *pcn) 72 { 73 74 dorot13(pcn->pcn_name, pcn->pcn_namelen); 75 76 return 0; 77 } 78 79 int 80 main(int argc, char *argv[]) 81 { 82 struct puffs_usermount *pu; 83 struct puffs_ops *pops; 84 struct puffs_pathobj *po_root; 85 struct statvfs svfsb; 86 struct stat sb; 87 mntoptparse_t mp; 88 int mntflags, pflags, lflags; 89 int ch; 90 int i; 91 92 setprogname(argv[0]); 93 94 if (argc < 3) 95 usage(); 96 97 pflags = lflags = mntflags = 0; 98 while ((ch = getopt(argc, argv, "o:s")) != -1) { 99 switch (ch) { 100 case 'o': 101 mp = getmntopts(optarg, puffsmopts, &mntflags, &pflags); 102 if (mp == NULL) 103 err(1, "getmntopts"); 104 freemntopts(mp); 105 break; 106 case 's': 107 lflags |= PUFFSLOOP_NODAEMON; 108 break; 109 } 110 } 111 pflags |= PUFFS_FLAG_BUILDPATH; 112 argv += optind; 113 argc -= optind; 114 115 if (pflags & PUFFS_FLAG_OPDUMP) 116 lflags = PUFFSLOOP_NODAEMON; 117 118 if (argc != 2) 119 usage(); 120 121 PUFFSOP_INIT(pops); 122 123 PUFFSOP_SET(pops, puffs_null, fs, statvfs); 124 PUFFSOP_SETFSNOP(pops, unmount); 125 PUFFSOP_SETFSNOP(pops, sync); 126 127 PUFFSOP_SET(pops, rot13, node, readdir); 128 PUFFSOP_SET(pops, rot13, node, read); 129 PUFFSOP_SET(pops, rot13, node, write); 130 131 PUFFSOP_SET(pops, puffs_null, node, lookup); 132 PUFFSOP_SET(pops, puffs_null, node, create); 133 PUFFSOP_SET(pops, puffs_null, node, mknod); 134 PUFFSOP_SET(pops, puffs_null, node, getattr); 135 PUFFSOP_SET(pops, puffs_null, node, setattr); 136 PUFFSOP_SET(pops, puffs_null, node, fsync); 137 PUFFSOP_SET(pops, puffs_null, node, remove); 138 PUFFSOP_SET(pops, puffs_null, node, link); 139 PUFFSOP_SET(pops, puffs_null, node, rename); 140 PUFFSOP_SET(pops, puffs_null, node, mkdir); 141 PUFFSOP_SET(pops, puffs_null, node, rmdir); 142 PUFFSOP_SET(pops, puffs_null, node, symlink); 143 PUFFSOP_SET(pops, puffs_null, node, readlink); 144 PUFFSOP_SET(pops, puffs_null, node, reclaim); 145 146 if ((pu = puffs_mount(pops, argv[1], mntflags, "rot13", NULL, 147 pflags, 0)) == NULL) 148 err(1, "mount"); 149 150 if (statvfs(argv[0], &svfsb) == -1) 151 err(1, "statvfs %s", argv[0]); 152 153 pu->pu_pn_root = puffs_pn_new(pu, NULL); 154 if (pu->pu_pn_root == NULL) 155 err(1, "puffs_pn_new"); 156 157 po_root = puffs_getrootpathobj(pu); 158 if (po_root == NULL) 159 err(1, "getrootpathobj"); 160 po_root->po_path = argv[0]; 161 po_root->po_len = strlen(argv[0]); 162 163 puffs_set_namemod(pu, rot13path); 164 165 if (stat(argv[0], &sb) == -1) 166 err(1, "stat %s", argv[0]); 167 puffs_stat2vattr(&pu->pu_pn_root->pn_va, &sb); 168 169 /* initialize rot13 tables */ 170 for (i = 0; i < 256; i++) 171 tbl[i] = (uint8_t)i; 172 for (i = 0; i <= 26; i++) 173 tbl[i + 'a'] = 'a' + ((i + 13) % 26); 174 for (i = 0; i < 26; i++) 175 tbl[i + 'A'] = 'A' + ((i + 13) % 26); 176 177 if (puffs_start(pu, pu->pu_pn_root, &svfsb) == -1) 178 err(1, "puffs_start"); 179 180 if (puffs_mainloop(pu, lflags) == -1) 181 err(1, "mainloop"); 182 183 return 0; 184 } 185 186 int 187 rot13_node_readdir(struct puffs_cc *pcc, void *opc, struct dirent *dent, 188 const struct puffs_cred *pcr, off_t *readoff, size_t *reslen) 189 { 190 struct dirent *dp; 191 size_t rl; 192 int rv; 193 194 dp = dent; 195 rl = *reslen; 196 197 rv = puffs_null_node_readdir(pcc, opc, dent, pcr, readoff, reslen); 198 if (rv) 199 return rv; 200 201 while (rl > *reslen) { 202 dorot13((uint8_t *)dp->d_name, dp->d_namlen); 203 rl -= _DIRENT_SIZE(dp); 204 dp = _DIRENT_NEXT(dp); 205 } 206 207 return 0; 208 } 209 210 int 211 rot13_node_read(struct puffs_cc *pcc, void *opc, uint8_t *buf, off_t offset, 212 size_t *resid, const struct puffs_cred *pcr, int ioflag) 213 { 214 uint8_t *prebuf = buf; 215 size_t preres = *resid; 216 int rv; 217 218 rv = puffs_null_node_read(pcc, opc, buf, offset, resid, pcr, ioflag); 219 if (rv) 220 return rv; 221 222 dorot13(prebuf, preres - *resid); 223 224 return rv; 225 } 226 227 int 228 rot13_node_write(struct puffs_cc *pcc, void *opc, uint8_t *buf, off_t offset, 229 size_t *resid, const struct puffs_cred *pcr, int ioflag) 230 { 231 232 dorot13(buf, *resid); 233 return puffs_null_node_write(pcc, opc, buf, offset, resid, pcr, ioflag); 234 } 235
Indexes created Tue Sep 30 20:09:53 GMT 2025