| File: | src/usr.bin/cap_mkdb/cap_mkdb.c |
| Warning: | line 231, column 8 Although the value stored to 'p' is used in the enclosing expression, the value is never actually read from 'p' |
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| 1 | /* $OpenBSD: cap_mkdb.c,v 1.26 2022/12/04 23:50:47 cheloha Exp $ */ |
| 2 | /* $NetBSD: cap_mkdb.c,v 1.5 1995/09/02 05:47:12 jtc Exp $ */ |
| 3 | |
| 4 | /*- |
| 5 | * Copyright (c) 1992, 1993 |
| 6 | * The Regents of the University of California. All rights reserved. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * 3. Neither the name of the University nor the names of its contributors |
| 17 | * may be used to endorse or promote products derived from this software |
| 18 | * without specific prior written permission. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 21 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 24 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 25 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 26 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 27 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 28 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 29 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 30 | * SUCH DAMAGE. |
| 31 | */ |
| 32 | |
| 33 | #include <sys/stat.h> |
| 34 | |
| 35 | #include <db.h> |
| 36 | #include <err.h> |
| 37 | #include <errno(*__errno()).h> |
| 38 | #include <fcntl.h> |
| 39 | #include <limits.h> |
| 40 | #include <stdio.h> |
| 41 | #include <stdlib.h> |
| 42 | #include <string.h> |
| 43 | #include <ctype.h> |
| 44 | #include <unistd.h> |
| 45 | |
| 46 | #define MINIMUM(a, b)(((a) < (b)) ? (a) : (b)) (((a) < (b)) ? (a) : (b)) |
| 47 | #define MAXIMUM(a, b)(((a) > (b)) ? (a) : (b)) (((a) > (b)) ? (a) : (b)) |
| 48 | |
| 49 | void db_build(char **); |
| 50 | void dounlink(void); |
| 51 | void usage(void); |
| 52 | |
| 53 | DB *capdbp; |
| 54 | int verbose; |
| 55 | char *capname, buf[8 * 1024]; |
| 56 | |
| 57 | HASHINFO openinfo = { |
| 58 | 4096, /* bsize */ |
| 59 | 16, /* ffactor */ |
| 60 | 256, /* nelem */ |
| 61 | 2048 * 1024, /* cachesize */ |
| 62 | NULL((void *)0), /* hash() */ |
| 63 | 0 /* lorder */ |
| 64 | }; |
| 65 | |
| 66 | /* |
| 67 | * cap_mkdb creates a capability hash database for quick retrieval of capability |
| 68 | * records. The database contains 2 types of entries: records and references |
| 69 | * marked by the first byte in the data. A record entry contains the actual |
| 70 | * capability record whereas a reference contains the name (key) under which |
| 71 | * the correct record is stored. |
| 72 | */ |
| 73 | int |
| 74 | main(int argc, char *argv[]) |
| 75 | { |
| 76 | int c; |
| 77 | |
| 78 | if (pledge("stdio rpath wpath cpath", NULL((void *)0)) == -1) |
| 79 | err(1, "pledge"); |
| 80 | |
| 81 | capname = NULL((void *)0); |
| 82 | while ((c = getopt(argc, argv, "f:iv")) != -1) { |
| 83 | switch(c) { |
| 84 | case 'f': |
| 85 | capname = optarg; |
| 86 | break; |
| 87 | case 'v': |
| 88 | verbose = 1; |
| 89 | break; |
| 90 | default: |
| 91 | usage(); |
| 92 | } |
| 93 | } |
| 94 | argc -= optind; |
| 95 | argv += optind; |
| 96 | |
| 97 | if (*argv == NULL((void *)0)) |
| 98 | usage(); |
| 99 | |
| 100 | /* |
| 101 | * The database file is the first argument if no name is specified. |
| 102 | * Make arrangements to unlink it if we exit badly. |
| 103 | */ |
| 104 | (void)snprintf(buf, sizeof(buf), "%s.db", capname ? capname : *argv); |
| 105 | if ((capname = strdup(buf)) == NULL((void *)0)) |
| 106 | err(1, NULL((void *)0)); |
| 107 | if ((capdbp = dbopen(capname, O_CREAT0x0200 | O_TRUNC0x0400 | O_RDWR0x0002, |
| 108 | DEFFILEMODE(0000400|0000200|0000040|0000020|0000004|0000002), DB_HASH, &openinfo)) == NULL((void *)0)) |
| 109 | err(1, "%s", buf); |
| 110 | |
| 111 | if (atexit(dounlink) != 0) |
| 112 | err(1, "atexit"); |
| 113 | |
| 114 | db_build(argv); |
| 115 | |
| 116 | if (capdbp->close(capdbp) < 0) |
| 117 | err(1, "%s", capname); |
| 118 | capname = NULL((void *)0); |
| 119 | exit(0); |
| 120 | } |
| 121 | |
| 122 | void |
| 123 | dounlink(void) |
| 124 | { |
| 125 | if (capname != NULL((void *)0)) |
| 126 | (void)unlink(capname); |
| 127 | } |
| 128 | |
| 129 | /* |
| 130 | * Any changes to these definitions should be made also in the getcap(3) |
| 131 | * library routines. |
| 132 | */ |
| 133 | #define RECOK(char)0 (char)0 |
| 134 | #define TCERR(char)1 (char)1 |
| 135 | #define SHADOW(char)2 (char)2 |
| 136 | |
| 137 | /* |
| 138 | * db_build() builds the name and capability databases according to the |
| 139 | * details above. |
| 140 | */ |
| 141 | void |
| 142 | db_build(char **ifiles) |
| 143 | { |
| 144 | DBT key, data; |
| 145 | recno_t reccnt; |
| 146 | size_t len, bplen; |
| 147 | int st; |
| 148 | char *bp, *p, *t, *capbeg, *capend; |
| 149 | |
| 150 | cgetusedb(0); /* disable reading of .db files in getcap(3) */ |
| 151 | |
| 152 | data.data = NULL((void *)0); |
| 153 | key.data = NULL((void *)0); |
| 154 | for (reccnt = 0, bplen = 0; (st = cgetnext(&bp, ifiles)) > 0;) { |
| 155 | |
| 156 | /* |
| 157 | * Allocate enough memory to store the size of the record plus |
| 158 | * a terminating NULL and one extra byte. |
| 159 | */ |
| 160 | len = strlen(bp); |
| 161 | if (bplen <= len + 2) { |
| 162 | int newbplen = bplen + MAXIMUM(256, len + 2)(((256) > (len + 2)) ? (256) : (len + 2)); |
| 163 | void *newdata; |
| 164 | |
| 165 | if ((newdata = realloc(data.data, newbplen)) == NULL((void *)0)) |
| 166 | err(1, NULL((void *)0)); |
| 167 | data.data = newdata; |
| 168 | bplen = newbplen; |
| 169 | } |
| 170 | |
| 171 | /* Find the end of the name field. */ |
| 172 | if ((p = strchr(bp, ':')) == NULL((void *)0)) { |
| 173 | warnx("no name field: %.*s", (int)MINIMUM(len, 20)(((len) < (20)) ? (len) : (20)), bp); |
| 174 | continue; |
| 175 | } |
| 176 | |
| 177 | /* First byte of stored record indicates status. */ |
| 178 | switch(st) { |
| 179 | case 1: |
| 180 | ((char *)(data.data))[0] = RECOK(char)0; |
| 181 | break; |
| 182 | case 2: |
| 183 | ((char *)(data.data))[0] = TCERR(char)1; |
| 184 | warnx("Record not tc expanded: %.*s", (int)(p - bp), bp); |
| 185 | break; |
| 186 | } |
| 187 | |
| 188 | /* Create the stored record. */ |
| 189 | t = (char *)data.data + 1; |
| 190 | /* Copy the cap name and trailing ':' */ |
| 191 | len = p - bp + 1; |
| 192 | memcpy(t, bp, len); |
| 193 | t += len; |
| 194 | |
| 195 | /* Copy entry, collapsing empty fields. */ |
| 196 | capbeg = p + 1; |
| 197 | while (*capbeg) { |
| 198 | /* Skip empty fields. */ |
| 199 | if ((len = strspn(capbeg, ": \t\n\r"))) |
| 200 | capbeg += len; |
| 201 | |
| 202 | /* Find the end of this cap and copy it w/ : */ |
| 203 | capend = strchr(capbeg, ':'); |
| 204 | if (capend) |
| 205 | len = capend - capbeg + 1; |
| 206 | else |
| 207 | len = strlen(capbeg); |
| 208 | memcpy(t, capbeg, len); |
| 209 | t += len; |
| 210 | capbeg += len; |
| 211 | } |
| 212 | *t = '\0'; |
| 213 | data.size = t - (char *)data.data + 1; |
| 214 | |
| 215 | /* Store the record under the name field. */ |
| 216 | key.data = bp; |
| 217 | key.size = p - bp; |
| 218 | |
| 219 | switch(capdbp->put(capdbp, &key, &data, R_NOOVERWRITE8)) { |
| 220 | case -1: |
| 221 | err(1, "put"); |
| 222 | /* NOTREACHED */ |
| 223 | case 1: |
| 224 | warnx("ignored duplicate: %.*s", |
| 225 | (int)key.size, (char *)key.data); |
| 226 | continue; |
| 227 | } |
| 228 | ++reccnt; |
| 229 | |
| 230 | /* If only one name, ignore the rest. */ |
| 231 | if ((p = strchr(bp, '|')) == NULL((void *)0)) |
Although the value stored to 'p' is used in the enclosing expression, the value is never actually read from 'p' | |
| 232 | continue; |
| 233 | |
| 234 | /* The rest of the names reference the entire name. */ |
| 235 | ((char *)(data.data))[0] = SHADOW(char)2; |
| 236 | (void) memmove(&((u_char *)(data.data))[1], key.data, key.size); |
| 237 | data.size = key.size + 1; |
| 238 | |
| 239 | /* Store references for other names. */ |
| 240 | for (p = t = bp;; ++p) { |
| 241 | if (p > t && (*p == ':' || *p == '|')) { |
| 242 | key.size = p - t; |
| 243 | key.data = t; |
| 244 | |
| 245 | /* |
| 246 | * If this is the last entry and contains any |
| 247 | * spaces, it is a description rather than an |
| 248 | * alias, so skip it and break. |
| 249 | */ |
| 250 | if (*p != '|' && |
| 251 | memchr(key.data, ' ', key.size) != NULL((void *)0)) |
| 252 | break; |
| 253 | |
| 254 | switch(capdbp->put(capdbp, |
| 255 | &key, &data, R_NOOVERWRITE8)) { |
| 256 | case -1: |
| 257 | err(1, "put"); |
| 258 | /* NOTREACHED */ |
| 259 | case 1: |
| 260 | warnx("ignored duplicate: %.*s", |
| 261 | (int)key.size, (char *)key.data); |
| 262 | } |
| 263 | t = p + 1; |
| 264 | } |
| 265 | if (*p == ':') |
| 266 | break; |
| 267 | } |
| 268 | free(bp); |
| 269 | } |
| 270 | |
| 271 | switch(st) { |
| 272 | case -1: |
| 273 | err(1, "file argument"); |
| 274 | /* NOTREACHED */ |
| 275 | case -2: |
| 276 | errx(1, "potential reference loop detected"); |
| 277 | /* NOTREACHED */ |
| 278 | } |
| 279 | |
| 280 | if (verbose) |
| 281 | (void)printf("cap_mkdb: %d capability records\n", reccnt); |
| 282 | } |
| 283 | |
| 284 | void |
| 285 | usage(void) |
| 286 | { |
| 287 | (void)fprintf(stderr(&__sF[2]), |
| 288 | "usage: cap_mkdb [-v] [-f outfile] file1 [file2 ...]\n"); |
| 289 | exit(1); |
| 290 | } |