| 1 | /* |
| 2 | ** Copyright 1998 - 2007 Double Precision, Inc. |
| 3 | ** See COPYING for distribution information. |
| 4 | */ |
| 5 | |
| 6 | #if HAVE_CONFIG_H |
| 7 | #include "config.h" |
| 8 | #endif |
| 9 | #include "dbobj.h" |
| 10 | #include "userdb.h" |
| 11 | #include <string.h> |
| 12 | #include <stdlib.h> |
| 13 | #include <stdio.h> |
| 14 | #include <errno.h> |
| 15 | #include <time.h> |
| 16 | #include <sys/types.h> |
| 17 | #if HAVE_SYS_STAT_H |
| 18 | #include <sys/stat.h> |
| 19 | #endif |
| 20 | |
| 21 | |
| 22 | static struct dbobj d; |
| 23 | static time_t dt; |
| 24 | static ino_t di; |
| 25 | |
| 26 | static int initialized=0; |
| 27 | int userdb_debug_level=0; |
| 28 | |
| 29 | /* Open userdb.dat, if already opened, see if it changed, if so reopen */ |
| 30 | |
| 31 | void userdb_init(const char *n) |
| 32 | { |
| 33 | struct stat stat_buf; |
| 34 | |
| 35 | if (initialized) |
| 36 | { |
| 37 | if (stat(n, &stat_buf) || |
| 38 | stat_buf.st_mtime != dt || |
| 39 | stat_buf.st_ino != di) |
| 40 | { |
| 41 | dbobj_close(&d); |
| 42 | initialized=0; |
| 43 | dt=stat_buf.st_mtime; |
| 44 | di=stat_buf.st_ino; |
| 45 | } |
| 46 | } |
| 47 | else if (stat(n, &stat_buf)) |
| 48 | { |
| 49 | if (userdb_debug_level) |
| 50 | fprintf(stderr, |
| 51 | "DEBUG: userdb: unable to stat %s: %s\n", |
| 52 | n, strerror(errno)); |
| 53 | return; |
| 54 | } |
| 55 | else |
| 56 | { |
| 57 | dt=stat_buf.st_mtime; |
| 58 | di=stat_buf.st_ino; |
| 59 | } |
| 60 | |
| 61 | if (!initialized) |
| 62 | { |
| 63 | if (dbobj_open(&d, n, "R")) |
| 64 | { |
| 65 | if (userdb_debug_level) |
| 66 | fprintf(stderr, |
| 67 | "DEBUG: userdb: failed to open %s\n", |
| 68 | n); |
| 69 | return; |
| 70 | } |
| 71 | if (userdb_debug_level) |
| 72 | fprintf(stderr, "DEBUG: userdb: opened %s\n", n); |
| 73 | initialized=1; |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | void userdb_close() |
| 78 | { |
| 79 | if (initialized) |
| 80 | { |
| 81 | dbobj_close(&d); |
| 82 | initialized=0; |
| 83 | } |
| 84 | userdb_debug_level=0; |
| 85 | } |
| 86 | |
| 87 | void userdb_set_debug(int lvl) |
| 88 | { |
| 89 | userdb_debug_level = lvl; |
| 90 | } |
| 91 | |
| 92 | /* Fetch a record from userdb.dat */ |
| 93 | |
| 94 | char *userdb(const char *u) |
| 95 | { |
| 96 | char *p,*q; |
| 97 | size_t l; |
| 98 | |
| 99 | if (!initialized) |
| 100 | { |
| 101 | errno=ENOENT; |
| 102 | return (0); |
| 103 | } |
| 104 | |
| 105 | q=dbobj_fetch(&d, u, strlen(u), &l, ""); |
| 106 | if (!q) |
| 107 | { |
| 108 | if (userdb_debug_level) |
| 109 | fprintf(stderr, "DEBUG: userdb: entry not found\n"); |
| 110 | errno=ENOENT; |
| 111 | return(0); |
| 112 | } |
| 113 | |
| 114 | p=malloc(l+1); |
| 115 | if (!p) |
| 116 | { |
| 117 | free(q); |
| 118 | return (0); |
| 119 | } |
| 120 | |
| 121 | if (l) memcpy(p, q, l); |
| 122 | free(q); |
| 123 | p[l]=0; |
| 124 | return (p); |
| 125 | } |
| 126 | |
| 127 | /* Return a pointer to a specific field in this record */ |
| 128 | |
| 129 | const char *userdb_get(const char *u, const char *n, int *l) |
| 130 | { |
| 131 | int nl=strlen(n); |
| 132 | |
| 133 | while (u && *u) |
| 134 | { |
| 135 | if (memcmp(u, n, nl) == 0 && |
| 136 | (u[nl] == 0 || u[nl] == '=' || u[nl] == '|')) |
| 137 | { |
| 138 | u += nl; |
| 139 | *l=0; |
| 140 | if (*u == '=') |
| 141 | { |
| 142 | ++u; |
| 143 | while ( u[*l] && u[*l] != '|') |
| 144 | ++ *l; |
| 145 | } |
| 146 | return (u); |
| 147 | } |
| 148 | u=strchr(u, '|'); |
| 149 | if (u) ++u; |
| 150 | } |
| 151 | return (0); |
| 152 | } |
| 153 | |
| 154 | /* Extract field as an unsigned int */ |
| 155 | |
| 156 | unsigned userdb_getu(const char *u, const char *n, unsigned defnum) |
| 157 | { |
| 158 | int l; |
| 159 | const char *p; |
| 160 | |
| 161 | if ((p=userdb_get(u, n, &l)) != 0) |
| 162 | { |
| 163 | defnum=0; |
| 164 | while (l && *p >= '0' && *p <= '9') |
| 165 | { |
| 166 | defnum = defnum * 10 + (*p++ - '0'); |
| 167 | --l; |
| 168 | } |
| 169 | } |
| 170 | return (defnum); |
| 171 | } |
| 172 | |
| 173 | /* Extract a field into a dynamically allocated buffer */ |
| 174 | |
| 175 | char *userdb_gets(const char *u, const char *n) |
| 176 | { |
| 177 | int l; |
| 178 | const char *p; |
| 179 | char *q; |
| 180 | |
| 181 | if ((p=userdb_get(u, n, &l)) != 0) |
| 182 | { |
| 183 | q=malloc(l+1); |
| 184 | if (!q) |
| 185 | return (0); |
| 186 | |
| 187 | if (l) memcpy(q, p, l); |
| 188 | q[l]=0; |
| 189 | return (q); |
| 190 | } |
| 191 | errno=ENOENT; |
| 192 | return (0); |
| 193 | } |
| 194 | |
| 195 | /* Create a userdbs structure based upon a uid (reverse lookup) */ |
| 196 | |
| 197 | struct userdbs *userdb_createsuid(uid_t u) |
| 198 | { |
| 199 | char buf[80]; |
| 200 | char *p=buf+sizeof(buf)-1, *q; |
| 201 | struct userdbs *s; |
| 202 | |
| 203 | /* Lookup uid= record */ |
| 204 | |
| 205 | *p=0; |
| 206 | *--p='='; |
| 207 | do |
| 208 | { |
| 209 | *--p= "0123456789"[u % 10]; |
| 210 | u=u/10; |
| 211 | } while (u); |
| 212 | p=userdb(p); |
| 213 | if (!p) return (0); |
| 214 | |
| 215 | /* Have account name, now look it up. */ |
| 216 | |
| 217 | q=userdb(p); |
| 218 | if (!q) |
| 219 | { |
| 220 | free(p); |
| 221 | return (0); |
| 222 | } |
| 223 | s=userdb_creates(q); |
| 224 | if (s) |
| 225 | s->udb_name=p; |
| 226 | else |
| 227 | free(p); |
| 228 | free(q); |
| 229 | return (s); |
| 230 | } |
| 231 | |
| 232 | static struct userdbs *userdb_enum(char *key, size_t keylen, |
| 233 | char *val, size_t vallen) |
| 234 | { |
| 235 | if (key) |
| 236 | { |
| 237 | char *valz=malloc(vallen+1); |
| 238 | |
| 239 | if (valz) |
| 240 | { |
| 241 | struct userdbs *udbs; |
| 242 | |
| 243 | memcpy(valz, val, vallen); |
| 244 | valz[vallen]=0; |
| 245 | |
| 246 | udbs=userdb_creates(valz); |
| 247 | |
| 248 | if (udbs) |
| 249 | { |
| 250 | if ((udbs->udb_name=malloc(keylen+1)) != NULL) |
| 251 | { |
| 252 | memcpy(udbs->udb_name, key, keylen); |
| 253 | udbs->udb_name[keylen]=0; |
| 254 | free(valz); |
| 255 | return udbs; |
| 256 | } |
| 257 | userdb_frees(udbs); |
| 258 | } |
| 259 | free(valz); |
| 260 | } |
| 261 | } |
| 262 | return NULL; |
| 263 | } |
| 264 | |
| 265 | |
| 266 | struct userdbs *userdb_enum_first() |
| 267 | { |
| 268 | char *val; |
| 269 | size_t vallen; |
| 270 | size_t keylen; |
| 271 | char *key=dbobj_firstkey(&d, &keylen, &val, &vallen); |
| 272 | |
| 273 | if (key) |
| 274 | { |
| 275 | struct userdbs *udbs=userdb_enum(key, keylen, val, vallen); |
| 276 | |
| 277 | free(val); |
| 278 | |
| 279 | if (udbs) |
| 280 | return udbs; |
| 281 | |
| 282 | /* Could be a reverse UID entry */ |
| 283 | |
| 284 | return userdb_enum_next(); |
| 285 | } |
| 286 | return NULL; |
| 287 | } |
| 288 | |
| 289 | struct userdbs *userdb_enum_next() |
| 290 | { |
| 291 | char *val; |
| 292 | size_t vallen; |
| 293 | size_t keylen; |
| 294 | char *key; |
| 295 | |
| 296 | while ((key=dbobj_nextkey(&d, &keylen, &val, &vallen)) != NULL) |
| 297 | { |
| 298 | struct userdbs *udbs=userdb_enum(key, keylen, val, vallen); |
| 299 | |
| 300 | free(val); |
| 301 | |
| 302 | if (udbs) |
| 303 | return udbs; |
| 304 | } |
| 305 | return NULL; |
| 306 | } |
| 307 | |
| 308 | /* Extracted a userdb.dat record, convert it to a userdbs structure */ |
| 309 | |
| 310 | struct userdbs *userdb_creates(const char *u) |
| 311 | { |
| 312 | struct userdbs *udbs=(struct userdbs *)malloc(sizeof(struct userdbs)); |
| 313 | char *s; |
| 314 | |
| 315 | if (!udbs) return (0); |
| 316 | memset((char *)udbs, 0, sizeof(*udbs)); |
| 317 | |
| 318 | if ((udbs->udb_dir=userdb_gets(u, "home")) == 0) |
| 319 | { |
| 320 | if (userdb_debug_level) |
| 321 | fprintf(stderr, |
| 322 | "DEBUG: userdb: required value 'home' is missing\n"); |
| 323 | userdb_frees(udbs); |
| 324 | return (0); |
| 325 | } |
| 326 | |
| 327 | if ((s=userdb_gets(u, "uid")) != 0) |
| 328 | { |
| 329 | udbs->udb_uid=atol(s); |
| 330 | free(s); |
| 331 | if ((s=userdb_gets(u, "gid")) != 0) |
| 332 | { |
| 333 | udbs->udb_gid=atol(s); |
| 334 | free(s); |
| 335 | |
| 336 | if ((s=userdb_gets(u, "shell")) != 0) |
| 337 | udbs->udb_shell=s; |
| 338 | else if (errno != ENOENT) |
| 339 | { |
| 340 | userdb_frees(udbs); |
| 341 | return (0); |
| 342 | } |
| 343 | |
| 344 | if ((s=userdb_gets(u, "mail")) != 0) |
| 345 | udbs->udb_mailbox=s; |
| 346 | else if (errno != ENOENT) |
| 347 | { |
| 348 | userdb_frees(udbs); |
| 349 | return (0); |
| 350 | } |
| 351 | if ((s=userdb_gets(u, "quota")) != 0) |
| 352 | udbs->udb_quota=s; |
| 353 | else if (errno != ENOENT) |
| 354 | { |
| 355 | userdb_frees(udbs); |
| 356 | return (0); |
| 357 | } |
| 358 | if ((s=userdb_gets(u, "gecos")) != 0) |
| 359 | udbs->udb_gecos=s; |
| 360 | else if (errno != ENOENT) |
| 361 | { |
| 362 | userdb_frees(udbs); |
| 363 | return (0); |
| 364 | } |
| 365 | if ((s=userdb_gets(u, "options")) != 0) |
| 366 | udbs->udb_options=s; |
| 367 | else if (errno != ENOENT) |
| 368 | { |
| 369 | userdb_frees(udbs); |
| 370 | return (0); |
| 371 | } |
| 372 | udbs->udb_source=userdb_gets(u, "_"); |
| 373 | if (userdb_debug_level) |
| 374 | fprintf(stderr, |
| 375 | "DEBUG: userdb: home=%s, uid=%ld, gid=%ld, shell=%s, " |
| 376 | "mail=%s, quota=%s, gecos=%s, options=%s\n", |
| 377 | udbs->udb_dir ? udbs->udb_dir : "<unset>", |
| 378 | (long)udbs->udb_uid, (long)udbs->udb_gid, |
| 379 | udbs->udb_shell ? udbs->udb_shell : "<unset>", |
| 380 | udbs->udb_mailbox ? udbs->udb_mailbox : "<unset>", |
| 381 | udbs->udb_quota ? udbs->udb_quota : "<unset>", |
| 382 | udbs->udb_gecos ? udbs->udb_gecos : "<unset>", |
| 383 | udbs->udb_options ? udbs->udb_options : "<unset>"); |
| 384 | return (udbs); |
| 385 | } |
| 386 | else |
| 387 | if (userdb_debug_level) |
| 388 | fprintf(stderr, |
| 389 | "DEBUG: userdb: required value 'gid' is missing\n"); |
| 390 | } |
| 391 | else |
| 392 | if (userdb_debug_level) |
| 393 | fprintf(stderr, |
| 394 | "DEBUG: userdb: required value 'uid' is missing\n"); |
| 395 | userdb_frees(udbs); |
| 396 | return (0); |
| 397 | } |
| 398 | |
| 399 | void userdb_frees(struct userdbs *u) |
| 400 | { |
| 401 | if (u->udb_options) free(u->udb_options); |
| 402 | if (u->udb_name) free(u->udb_name); |
| 403 | if (u->udb_gecos) free(u->udb_gecos); |
| 404 | if (u->udb_dir) free(u->udb_dir); |
| 405 | if (u->udb_shell) free(u->udb_shell); |
| 406 | if (u->udb_mailbox) free(u->udb_mailbox); |
| 407 | if (u->udb_quota) free(u->udb_quota); |
| 408 | if (u->udb_source) free(u->udb_source); |
| 409 | free(u); |
| 410 | } |
| 411 | |