| 1 | /* rdperm.c |
| 2 | Read the HDB Permissions file. |
| 3 | |
| 4 | Copyright (C) 1992, 1993 Ian Lance Taylor |
| 5 | |
| 6 | This file is part of the Taylor UUCP uuconf library. |
| 7 | |
| 8 | This library is free software; you can redistribute it and/or |
| 9 | modify it under the terms of the GNU Library General Public License |
| 10 | as published by the Free Software Foundation; either version 2 of |
| 11 | the License, or (at your option) any later version. |
| 12 | |
| 13 | This library is distributed in the hope that it will be useful, but |
| 14 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 16 | Library General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU Library General Public |
| 19 | License along with this library; if not, write to the Free Software |
| 20 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 21 | |
| 22 | The author of the program may be contacted at ian@airs.com or |
| 23 | c/o Cygnus Support, Building 200, 1 Kendall Square, Cambridge, MA 02139. |
| 24 | */ |
| 25 | |
| 26 | #include "uucnfi.h" |
| 27 | |
| 28 | #if USE_RCS_ID |
| 29 | const char _uuconf_rdperm_rcsid[] = "$Id: rdperm.c,v 1.7 1994/01/30 21:14:29 ian Rel $"; |
| 30 | #endif |
| 31 | |
| 32 | #include <errno.h> |
| 33 | #include <ctype.h> |
| 34 | \f |
| 35 | static int ihcolon P((pointer pglobal, int argc, char **argv, pointer pvar, |
| 36 | pointer pinfo)); |
| 37 | static int ihsendfiles P((pointer pglobal, int argc, char **argv, |
| 38 | pointer pvar, pointer pinfo)); |
| 39 | static int ihunknownperm P((pointer pglobal, int argc, char **argv, |
| 40 | pointer pvar, pointer pinfo)); |
| 41 | static int ihadd_norw P((struct sglobal *qglobal, char ***ppz, char **pzno)); |
| 42 | \f |
| 43 | /* These routines reads in the HDB Permissions file. We store the |
| 44 | entries in a linked list of shpermissions structures, so we only |
| 45 | have to actually read the file once. */ |
| 46 | |
| 47 | /* This command table and static structure are used to parse a line |
| 48 | from Permissions. The entries are parsed as follows: |
| 49 | |
| 50 | Multiple strings separated by colons: LOGNAME, MACHINE, READ, |
| 51 | WRITE, NOREAD, NOWRITE, COMMANDS, VALIDATE, ALIAS. |
| 52 | |
| 53 | Boolean values: REQUEST, CALLBACK. |
| 54 | |
| 55 | Simple strings: MYNAME, PUBDIR. |
| 56 | |
| 57 | "Yes" or "call": SENDFILES. |
| 58 | |
| 59 | The NOREAD and NOWRITE entries are merged into the READ and WRITE |
| 60 | entries, rather than being permanently stored. They are handled |
| 61 | specially in the uuconf_cmdtab table. */ |
| 62 | |
| 63 | static const struct cmdtab_offset asHperm_cmds[] = |
| 64 | { |
| 65 | { "NOREAD", UUCONF_CMDTABTYPE_FN | 2, (size_t) -1, ihcolon }, |
| 66 | { "NOWRITE", UUCONF_CMDTABTYPE_FN | 2, (size_t) -1, ihcolon }, |
| 67 | { "LOGNAME", UUCONF_CMDTABTYPE_FN | 2, |
| 68 | offsetof (struct shpermissions, pzlogname), ihcolon }, |
| 69 | { "MACHINE", UUCONF_CMDTABTYPE_FN | 2, |
| 70 | offsetof (struct shpermissions, pzmachine), ihcolon }, |
| 71 | { "REQUEST", UUCONF_CMDTABTYPE_BOOLEAN, |
| 72 | offsetof (struct shpermissions, frequest), NULL }, |
| 73 | { "SENDFILES", UUCONF_CMDTABTYPE_FN | 2, |
| 74 | offsetof (struct shpermissions, fsendfiles), ihsendfiles }, |
| 75 | { "READ", UUCONF_CMDTABTYPE_FN | 2, |
| 76 | offsetof (struct shpermissions, pzread), ihcolon }, |
| 77 | { "WRITE", UUCONF_CMDTABTYPE_FN | 2, |
| 78 | offsetof (struct shpermissions, pzwrite), ihcolon }, |
| 79 | { "CALLBACK", UUCONF_CMDTABTYPE_BOOLEAN, |
| 80 | offsetof (struct shpermissions, fcallback), NULL }, |
| 81 | { "COMMANDS", UUCONF_CMDTABTYPE_FN | 2, |
| 82 | offsetof (struct shpermissions, pzcommands), ihcolon }, |
| 83 | { "VALIDATE", UUCONF_CMDTABTYPE_FN | 2, |
| 84 | offsetof (struct shpermissions, pzvalidate), ihcolon }, |
| 85 | { "MYNAME", UUCONF_CMDTABTYPE_STRING, |
| 86 | offsetof (struct shpermissions, zmyname), NULL }, |
| 87 | { "PUBDIR", UUCONF_CMDTABTYPE_STRING, |
| 88 | offsetof (struct shpermissions, zpubdir), NULL }, |
| 89 | { "ALIAS", UUCONF_CMDTABTYPE_FN | 2, |
| 90 | offsetof (struct shpermissions, pzalias), ihcolon }, |
| 91 | { NULL, 0, 0, NULL } |
| 92 | }; |
| 93 | |
| 94 | #define CHPERM_CMDS (sizeof asHperm_cmds / sizeof asHperm_cmds[0]) |
| 95 | \f |
| 96 | /* Actually read the Permissions file into a linked list of |
| 97 | structures. */ |
| 98 | |
| 99 | int |
| 100 | _uuconf_ihread_permissions (qglobal) |
| 101 | struct sglobal *qglobal; |
| 102 | { |
| 103 | char *zperm; |
| 104 | FILE *e; |
| 105 | int iret; |
| 106 | struct uuconf_cmdtab as[CHPERM_CMDS]; |
| 107 | char **pznoread, **pznowrite; |
| 108 | struct shpermissions shperm; |
| 109 | char *zline; |
| 110 | size_t cline; |
| 111 | char **pzsplit; |
| 112 | size_t csplit; |
| 113 | int cchars; |
| 114 | struct shpermissions *qlist, **pq; |
| 115 | |
| 116 | if (qglobal->qprocess->fhdb_read_permissions) |
| 117 | return UUCONF_SUCCESS; |
| 118 | |
| 119 | zperm = (char *) uuconf_malloc (qglobal->pblock, |
| 120 | (sizeof OLDCONFIGLIB |
| 121 | + sizeof HDB_PERMISSIONS - 1)); |
| 122 | if (zperm == NULL) |
| 123 | { |
| 124 | qglobal->ierrno = errno; |
| 125 | return UUCONF_MALLOC_FAILED | UUCONF_ERROR_ERRNO; |
| 126 | } |
| 127 | |
| 128 | memcpy ((pointer) zperm, (pointer) OLDCONFIGLIB, |
| 129 | sizeof OLDCONFIGLIB - 1); |
| 130 | memcpy ((pointer) (zperm + sizeof OLDCONFIGLIB - 1), |
| 131 | (pointer) HDB_PERMISSIONS, sizeof HDB_PERMISSIONS); |
| 132 | |
| 133 | e = fopen (zperm, "r"); |
| 134 | if (e == NULL) |
| 135 | { |
| 136 | uuconf_free (qglobal->pblock, zperm); |
| 137 | qglobal->qprocess->fhdb_read_permissions = TRUE; |
| 138 | return UUCONF_SUCCESS; |
| 139 | } |
| 140 | |
| 141 | _uuconf_ucmdtab_base (asHperm_cmds, CHPERM_CMDS, (char *) &shperm, as); |
| 142 | as[0].uuconf_pvar = (pointer) &pznoread; |
| 143 | as[1].uuconf_pvar = (pointer) &pznowrite; |
| 144 | |
| 145 | zline = NULL; |
| 146 | cline = 0; |
| 147 | pzsplit = NULL; |
| 148 | csplit = 0; |
| 149 | |
| 150 | qlist = NULL; |
| 151 | pq = &qlist; |
| 152 | |
| 153 | qglobal->ilineno = 0; |
| 154 | |
| 155 | iret = UUCONF_SUCCESS; |
| 156 | |
| 157 | while ((cchars = _uuconf_getline (qglobal, &zline, &cline, e)) > 0) |
| 158 | { |
| 159 | int centries; |
| 160 | struct shpermissions *qnew; |
| 161 | int i; |
| 162 | |
| 163 | ++qglobal->ilineno; |
| 164 | |
| 165 | --cchars; |
| 166 | if (zline[cchars] == '\n') |
| 167 | zline[cchars] = '\0'; |
| 168 | if (zline[0] == '#') |
| 169 | continue; |
| 170 | |
| 171 | centries = _uuconf_istrsplit (zline, '\0', &pzsplit, &csplit); |
| 172 | if (centries < 0) |
| 173 | { |
| 174 | qglobal->ierrno = errno; |
| 175 | iret = UUCONF_MALLOC_FAILED | UUCONF_ERROR_ERRNO; |
| 176 | break; |
| 177 | } |
| 178 | |
| 179 | if (centries == 0) |
| 180 | continue; |
| 181 | |
| 182 | shperm.pzlogname = (char **) &_uuconf_unset; |
| 183 | shperm.pzmachine = (char **) &_uuconf_unset; |
| 184 | shperm.frequest = -1; |
| 185 | shperm.fsendfiles = -1; |
| 186 | shperm.pzread = (char **) &_uuconf_unset; |
| 187 | shperm.pzwrite = (char **) &_uuconf_unset; |
| 188 | shperm.fcallback = -1; |
| 189 | shperm.pzcommands = (char **) &_uuconf_unset; |
| 190 | shperm.pzvalidate = (char **) &_uuconf_unset; |
| 191 | shperm.zmyname = (char *) &_uuconf_unset; |
| 192 | shperm.zpubdir = (char *) &_uuconf_unset; |
| 193 | shperm.pzalias = (char **) &_uuconf_unset; |
| 194 | pznoread = (char **) &_uuconf_unset; |
| 195 | pznowrite = (char **) &_uuconf_unset; |
| 196 | |
| 197 | for (i = 0; i < centries; i++) |
| 198 | { |
| 199 | char *zeq; |
| 200 | char *azargs[2]; |
| 201 | |
| 202 | zeq = strchr (pzsplit[i], '='); |
| 203 | if (zeq == NULL) |
| 204 | { |
| 205 | iret = UUCONF_SYNTAX_ERROR; |
| 206 | qglobal->qprocess->fhdb_read_permissions = TRUE; |
| 207 | break; |
| 208 | } |
| 209 | *zeq = '\0'; |
| 210 | |
| 211 | azargs[0] = pzsplit[i]; |
| 212 | azargs[1] = zeq + 1; |
| 213 | |
| 214 | iret = uuconf_cmd_args (qglobal, 2, azargs, as, (pointer) NULL, |
| 215 | ihunknownperm, 0, qglobal->pblock); |
| 216 | if ((iret & UUCONF_CMDTABRET_KEEP) != 0) |
| 217 | { |
| 218 | iret &=~ UUCONF_CMDTABRET_KEEP; |
| 219 | |
| 220 | if (uuconf_add_block (qglobal->pblock, zline) != 0) |
| 221 | { |
| 222 | qglobal->ierrno = errno; |
| 223 | iret = UUCONF_MALLOC_FAILED | UUCONF_ERROR_ERRNO; |
| 224 | break; |
| 225 | } |
| 226 | |
| 227 | zline = NULL; |
| 228 | cline = 0; |
| 229 | } |
| 230 | if ((iret & UUCONF_CMDTABRET_EXIT) != 0) |
| 231 | { |
| 232 | iret &=~ UUCONF_CMDTABRET_EXIT; |
| 233 | break; |
| 234 | } |
| 235 | } |
| 236 | |
| 237 | if (iret != UUCONF_SUCCESS) |
| 238 | break; |
| 239 | |
| 240 | if (shperm.pzmachine == (char **) &_uuconf_unset |
| 241 | && shperm.pzlogname == (char **) &_uuconf_unset) |
| 242 | { |
| 243 | iret = UUCONF_SYNTAX_ERROR; |
| 244 | qglobal->qprocess->fhdb_read_permissions = TRUE; |
| 245 | break; |
| 246 | } |
| 247 | |
| 248 | /* Attach any NOREAD or NOWRITE entries to the corresponding |
| 249 | READ or WRITE entries in the format expected for the |
| 250 | pzlocal_receive, etc., fields in uuconf_system. */ |
| 251 | if (pznoread != NULL) |
| 252 | { |
| 253 | iret = ihadd_norw (qglobal, &shperm.pzread, pznoread); |
| 254 | if (iret != UUCONF_SUCCESS) |
| 255 | break; |
| 256 | uuconf_free (qglobal->pblock, pznoread); |
| 257 | } |
| 258 | |
| 259 | if (pznowrite != NULL) |
| 260 | { |
| 261 | iret = ihadd_norw (qglobal, &shperm.pzwrite, pznowrite); |
| 262 | if (iret != UUCONF_SUCCESS) |
| 263 | break; |
| 264 | uuconf_free (qglobal->pblock, pznowrite); |
| 265 | } |
| 266 | |
| 267 | qnew = ((struct shpermissions *) |
| 268 | uuconf_malloc (qglobal->pblock, |
| 269 | sizeof (struct shpermissions))); |
| 270 | if (qnew == NULL) |
| 271 | { |
| 272 | qglobal->ierrno = errno; |
| 273 | iret = UUCONF_MALLOC_FAILED | UUCONF_ERROR_ERRNO; |
| 274 | break; |
| 275 | } |
| 276 | |
| 277 | *qnew = shperm; |
| 278 | *pq = qnew; |
| 279 | pq = &qnew->qnext; |
| 280 | *pq = NULL; |
| 281 | } |
| 282 | |
| 283 | (void) fclose (e); |
| 284 | |
| 285 | if (zline != NULL) |
| 286 | free ((pointer) zline); |
| 287 | if (pzsplit != NULL) |
| 288 | free ((pointer) pzsplit); |
| 289 | |
| 290 | if (iret == UUCONF_SUCCESS) |
| 291 | { |
| 292 | qglobal->qprocess->qhdb_permissions = qlist; |
| 293 | qglobal->qprocess->fhdb_read_permissions = TRUE; |
| 294 | } |
| 295 | else |
| 296 | { |
| 297 | qglobal->zfilename = zperm; |
| 298 | iret |= UUCONF_ERROR_FILENAME | UUCONF_ERROR_LINENO; |
| 299 | } |
| 300 | |
| 301 | return iret; |
| 302 | } |
| 303 | \f |
| 304 | /* Split the argument into colon separated strings, and assign a NULL |
| 305 | terminated array of strings to pvar. */ |
| 306 | |
| 307 | /*ARGSUSED*/ |
| 308 | static int |
| 309 | ihcolon (pglobal, argc, argv, pvar, pinfo) |
| 310 | pointer pglobal; |
| 311 | int argc; |
| 312 | char **argv; |
| 313 | pointer pvar; |
| 314 | pointer pinfo; |
| 315 | { |
| 316 | struct sglobal *qglobal = (struct sglobal *) pglobal; |
| 317 | char ***ppz = (char ***) pvar; |
| 318 | char **pzsplit; |
| 319 | size_t csplit; |
| 320 | int centries; |
| 321 | int i; |
| 322 | int iret; |
| 323 | |
| 324 | *ppz = NULL; |
| 325 | |
| 326 | pzsplit = NULL; |
| 327 | csplit = 0; |
| 328 | |
| 329 | centries = _uuconf_istrsplit (argv[1], ':', &pzsplit, &csplit); |
| 330 | if (centries < 0) |
| 331 | { |
| 332 | qglobal->ierrno = errno; |
| 333 | return (UUCONF_MALLOC_FAILED |
| 334 | | UUCONF_ERROR_ERRNO |
| 335 | | UUCONF_CMDTABRET_EXIT); |
| 336 | } |
| 337 | |
| 338 | if (centries == 0) |
| 339 | { |
| 340 | if (pzsplit != NULL) |
| 341 | free ((pointer) pzsplit); |
| 342 | return UUCONF_CMDTABRET_CONTINUE; |
| 343 | } |
| 344 | |
| 345 | iret = UUCONF_SUCCESS; |
| 346 | |
| 347 | for (i = 0; i < centries; i++) |
| 348 | { |
| 349 | iret = _uuconf_iadd_string (qglobal, pzsplit[i], FALSE, FALSE, |
| 350 | ppz, qglobal->pblock); |
| 351 | if (iret != UUCONF_SUCCESS) |
| 352 | { |
| 353 | iret |= UUCONF_CMDTABRET_EXIT; |
| 354 | break; |
| 355 | } |
| 356 | } |
| 357 | |
| 358 | free ((pointer) pzsplit); |
| 359 | |
| 360 | return UUCONF_CMDTABRET_KEEP; |
| 361 | } |
| 362 | |
| 363 | /* Handle the SENDFILES parameter, which can take "yes" or "call" or |
| 364 | "no" as an argument. The string "call" is equivalent to "no". */ |
| 365 | |
| 366 | /*ARGSUSED*/ |
| 367 | static int |
| 368 | ihsendfiles (pglobal, argc, argv, pvar, pinfo) |
| 369 | pointer pglobal; |
| 370 | int argc; |
| 371 | char **argv; |
| 372 | pointer pvar; |
| 373 | pointer pinfo; |
| 374 | { |
| 375 | int *pi = (int *) pvar; |
| 376 | |
| 377 | switch (argv[1][0]) |
| 378 | { |
| 379 | case 'C': |
| 380 | case 'c': |
| 381 | case 'N': |
| 382 | case 'n': |
| 383 | *pi = FALSE; |
| 384 | break; |
| 385 | case 'Y': |
| 386 | case 'y': |
| 387 | *pi = TRUE; |
| 388 | break; |
| 389 | default: |
| 390 | return UUCONF_SYNTAX_ERROR | UUCONF_CMDTABRET_EXIT; |
| 391 | } |
| 392 | |
| 393 | return UUCONF_CMDTABRET_CONTINUE; |
| 394 | } |
| 395 | |
| 396 | /* If there is an unknown Permissions entry, return a syntax error. |
| 397 | This should probably be more clever. */ |
| 398 | |
| 399 | /*ARGSUSED*/ |
| 400 | static int |
| 401 | ihunknownperm (pglobal, argc, argv, pvar, pinfo) |
| 402 | pointer pglobal; |
| 403 | int argc; |
| 404 | char **argv; |
| 405 | pointer pvar; |
| 406 | pointer pinfo; |
| 407 | { |
| 408 | return UUCONF_SYNTAX_ERROR | UUCONF_CMDTABRET_EXIT; |
| 409 | } |
| 410 | |
| 411 | /* Add a NOREAD or NOWRITE entry to a READ or WRITE entry. */ |
| 412 | |
| 413 | static int |
| 414 | ihadd_norw (qglobal, ppz, pzno) |
| 415 | struct sglobal *qglobal; |
| 416 | char ***ppz; |
| 417 | char **pzno; |
| 418 | { |
| 419 | register char **pz; |
| 420 | |
| 421 | if (pzno == (char **) &_uuconf_unset) |
| 422 | return UUCONF_SUCCESS; |
| 423 | |
| 424 | for (pz = pzno; *pz != NULL; pz++) |
| 425 | { |
| 426 | size_t csize; |
| 427 | char *znew; |
| 428 | int iret; |
| 429 | |
| 430 | /* Ignore an attempt to say NOREAD or NOWRITE with an empty |
| 431 | string, since it will be interpreted as an attempt to deny |
| 432 | everything. */ |
| 433 | if (**pz != '\0') |
| 434 | { |
| 435 | csize = strlen (*pz) + 1; |
| 436 | znew = (char *) uuconf_malloc (qglobal->pblock, csize + 1); |
| 437 | if (znew == NULL) |
| 438 | { |
| 439 | qglobal->ierrno = errno; |
| 440 | return UUCONF_MALLOC_FAILED | UUCONF_ERROR_ERRNO; |
| 441 | } |
| 442 | znew[0] = '!'; |
| 443 | memcpy ((pointer) (znew + 1), (pointer) *pz, csize); |
| 444 | iret = _uuconf_iadd_string (qglobal, znew, FALSE, FALSE, ppz, |
| 445 | qglobal->pblock); |
| 446 | if (iret != UUCONF_SUCCESS) |
| 447 | return iret; |
| 448 | } |
| 449 | } |
| 450 | |
| 451 | return UUCONF_SUCCESS; |
| 452 | } |