1 /* $OpenBSD: cap_mkdb.c,v 1.25 2020/09/15 07:41:38 kevlo 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.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)) 47 #define MAXIMUM(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, /* 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) == -1) 79 err(1, "pledge"); 80 81 capname = NULL; 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 case '?': 91 default: 92 usage(); 93 } 94 } 95 argc -= optind; 96 argv += optind; 97 98 if (*argv == NULL) 99 usage(); 100 101 /* 102 * The database file is the first argument if no name is specified. 103 * Make arrangements to unlink it if we exit badly. 104 */ 105 (void)snprintf(buf, sizeof(buf), "%s.db", capname ? capname : *argv); 106 if ((capname = strdup(buf)) == NULL) 107 err(1, NULL); 108 if ((capdbp = dbopen(capname, O_CREAT | O_TRUNC | O_RDWR, 109 DEFFILEMODE, DB_HASH, &openinfo)) == NULL) 110 err(1, "%s", buf); 111 112 if (atexit(dounlink) != 0) 113 err(1, "atexit"); 114 115 db_build(argv); 116 117 if (capdbp->close(capdbp) < 0) 118 err(1, "%s", capname); 119 capname = NULL; 120 exit(0); 121 } 122 123 void 124 dounlink(void) 125 { 126 if (capname != NULL) 127 (void)unlink(capname); 128 } 129 130 /* 131 * Any changes to these definitions should be made also in the getcap(3) 132 * library routines. 133 */ 134 #define RECOK (char)0 135 #define TCERR (char)1 136 #define SHADOW (char)2 137 138 /* 139 * db_build() builds the name and capability databases according to the 140 * details above. 141 */ 142 void 143 db_build(char **ifiles) 144 { 145 DBT key, data; 146 recno_t reccnt; 147 size_t len, bplen; 148 int st; 149 char *bp, *p, *t, *capbeg, *capend; 150 151 cgetusedb(0); /* disable reading of .db files in getcap(3) */ 152 153 data.data = NULL; 154 key.data = NULL; 155 for (reccnt = 0, bplen = 0; (st = cgetnext(&bp, ifiles)) > 0;) { 156 157 /* 158 * Allocate enough memory to store the size of the record plus 159 * a terminating NULL and one extra byte. 160 */ 161 len = strlen(bp); 162 if (bplen <= len + 2) { 163 int newbplen = bplen + MAXIMUM(256, len + 2); 164 void *newdata; 165 166 if ((newdata = realloc(data.data, newbplen)) == NULL) 167 err(1, NULL); 168 data.data = newdata; 169 bplen = newbplen; 170 } 171 172 /* Find the end of the name field. */ 173 if ((p = strchr(bp, ':')) == NULL) { 174 warnx("no name field: %.*s", (int)MINIMUM(len, 20), bp); 175 continue; 176 } 177 178 /* First byte of stored record indicates status. */ 179 switch(st) { 180 case 1: 181 ((char *)(data.data))[0] = RECOK; 182 break; 183 case 2: 184 ((char *)(data.data))[0] = TCERR; 185 warnx("Record not tc expanded: %.*s", (int)(p - bp), bp); 186 break; 187 } 188 189 /* Create the stored record. */ 190 t = (char *)data.data + 1; 191 /* Copy the cap name and trailing ':' */ 192 len = p - bp + 1; 193 memcpy(t, bp, len); 194 t += len; 195 196 /* Copy entry, collapsing empty fields. */ 197 capbeg = p + 1; 198 while (*capbeg) { 199 /* Skip empty fields. */ 200 if ((len = strspn(capbeg, ": \t\n\r"))) 201 capbeg += len; 202 203 /* Find the end of this cap and copy it w/ : */ 204 capend = strchr(capbeg, ':'); 205 if (capend) 206 len = capend - capbeg + 1; 207 else 208 len = strlen(capbeg); 209 memcpy(t, capbeg, len); 210 t += len; 211 capbeg += len; 212 } 213 *t = '\0'; 214 data.size = t - (char *)data.data + 1; 215 216 /* Store the record under the name field. */ 217 key.data = bp; 218 key.size = p - bp; 219 220 switch(capdbp->put(capdbp, &key, &data, R_NOOVERWRITE)) { 221 case -1: 222 err(1, "put"); 223 /* NOTREACHED */ 224 case 1: 225 warnx("ignored duplicate: %.*s", 226 (int)key.size, (char *)key.data); 227 continue; 228 } 229 ++reccnt; 230 231 /* If only one name, ignore the rest. */ 232 if ((p = strchr(bp, '|')) == NULL) 233 continue; 234 235 /* The rest of the names reference the entire name. */ 236 ((char *)(data.data))[0] = SHADOW; 237 (void) memmove(&((u_char *)(data.data))[1], key.data, key.size); 238 data.size = key.size + 1; 239 240 /* Store references for other names. */ 241 for (p = t = bp;; ++p) { 242 if (p > t && (*p == ':' || *p == '|')) { 243 key.size = p - t; 244 key.data = t; 245 246 /* 247 * If this is the last entry and contains any 248 * spaces, it is a description rather than an 249 * alias, so skip it and break. 250 */ 251 if (*p != '|' && 252 memchr(key.data, ' ', key.size) != NULL) 253 break; 254 255 switch(capdbp->put(capdbp, 256 &key, &data, R_NOOVERWRITE)) { 257 case -1: 258 err(1, "put"); 259 /* NOTREACHED */ 260 case 1: 261 warnx("ignored duplicate: %.*s", 262 (int)key.size, (char *)key.data); 263 } 264 t = p + 1; 265 } 266 if (*p == ':') 267 break; 268 } 269 free(bp); 270 } 271 272 switch(st) { 273 case -1: 274 err(1, "file argument"); 275 /* NOTREACHED */ 276 case -2: 277 errx(1, "potential reference loop detected"); 278 /* NOTREACHED */ 279 } 280 281 if (verbose) 282 (void)printf("cap_mkdb: %d capability records\n", reccnt); 283 } 284 285 void 286 usage(void) 287 { 288 (void)fprintf(stderr, 289 "usage: cap_mkdb [-v] [-f outfile] file1 [file2 ...]\n"); 290 exit(1); 291 } 292