1: # include   "../ingres.h"
   2: # include   "../aux.h"
   3: # include   "../unix.h"
   4: # include   "../catalog.h"
   5: # include   "../access.h"
   6: # include   "../tree.h"
   7: # include   "../symbol.h"
   8: # include   "../lock.h"
   9: # include   "qrymod.h"
  10: 
  11: 
  12: 
  13: /*
  14: **  D_PROT -- define protection constraint
  15: **
  16: **	A protection constraint as partially defined by the last tree
  17: **	defined by d_tree is defined.
  18: **
  19: **	The stuff that comes through the pipe as parameters is complex.
  20: **	It comes as a sequence of strings:
  21: **	 # The operation set, already encoded in the parser into a
  22: **	   bit map.  If the PRO_RETR permission is set, the PRO_TEST
  23: **	   and PRO_AGGR permissions will also be set.
  24: **	 # The relation name.
  25: **	 # The relation owner.
  26: **	 # The user name.  This must be a user name as specified in
  27: **	   the 'users' file, or the keyword 'all', meaning all users.
  28: **	 # The terminal id.  Must be a string of the form 'ttyx' or
  29: **	   the keyword 'all'.
  30: **	 # The starting time of day, as minutes-since-midnight.
  31: **	 # The ending time of day.
  32: **	 # The starting day-of-week, with 0 = Sunday.
  33: **	 # The ending dow.
  34: **
  35: **	The domain reference set is build automatically from the
  36: **	target list of the tree.  Thus, the target list must exist,
  37: **	but it is not inserted into the tree.  The target list must
  38: **	be a flat sequence of RESDOM nodes with VAR nodes hanging
  39: **	of the rhs; also, the VAR nodes must all be for Resultvar.
  40: **	If there is no target list on the tree, the set of all var-
  41: **	iables is assumed.
  42: **
  43: **	The relstat field in the relation relation is updated to
  44: **	reflect any changes.
  45: **
  46: **	It only makes sense for the DBA to execute this command.
  47: **
  48: **	If there is one of the special cases
  49: **		permit all to all
  50: **		permit retrieve to all
  51: **	it is caught, and the effect is achieved by diddling
  52: **	relstat bits instead of inserting into the protect catalog.
  53: **
  54: **	Parameters:
  55: **		none
  56: **
  57: **	Returns:
  58: **		none
  59: **
  60: **	Side Effects:
  61: **		Activity in 'protect' and 'relation' catalogs.
  62: **
  63: **	Requires:
  64: **		Prodes, Reldes -- descriptors.
  65: **		opencatalog -- to open these relations.
  66: **		puttree -- to output the tree to the 'tree'
  67: **			relation.
  68: **		insert -- to output the tuple to the 'protect'
  69: **			relation.
  70: **		noclose -- to flush the 'protect' relation.
  71: **		Rangev, Qmode, Resultvar -- for various parameter
  72: **			validation.
  73: **		Treeroot -- a pointer to the protection tree.
  74: **
  75: **	Called By:
  76: **		define
  77: **
  78: **	Trace Flags:
  79: **		59
  80: **
  81: **	Diagnostics:
  82: **		3590 -- bad terminal id.
  83: **		3591 -- bad user name.
  84: **		3592 -- you do not own one of the relations involved.
  85: **		3593 -- attempt to define a protection constraint
  86: **			on a view.
  87: **		3594 -- you are not the dba.
  88: **
  89: **	Syserrs:
  90: **		On inconsistancies between pipe info and system
  91: **		catalogs.
  92: **
  93: **	History:
  94: **		2/19/79 (eric) -- split from define.c.
  95: */
  96: 
  97: extern struct admin     Admin;
  98: extern struct descriptor    Prodes;
  99: extern struct descriptor    Reldes;
 100: extern QTREE            *Treeroot;
 101: 
 102: d_prot()
 103: {
 104:     struct protect  protup;
 105:     struct tup_id   protid;
 106:     struct protect  prokey;
 107:     struct protect  proxtup;
 108:     register int    i;
 109:     auto int    ix;
 110:     int     treeid;
 111:     register QTREE  *t;
 112:     register char   *p;
 113:     struct relation reltup;
 114:     struct relation relkey;
 115:     struct tup_id   reltid;
 116:     int     relstat;
 117:     int     all_pro;
 118: 
 119:     /*
 120: 	**  Check for valid tree:
 121: 	**	There must be a tree defined, and all variables
 122: 	**	referenced must be owned by the current user; this
 123: 	**	is because you could otherwise get at data by
 124: 	**	mentioning it in a permit statement; see protect.c
 125: 	**	for a better explanation of this.
 126: 	*/
 127: 
 128:     if (Treeroot == NULL)
 129:         syserr("d_prot: NULL Treeroot");
 130:     for (i = 0; i < MAXVAR + 1; i++)
 131:     {
 132:         if (!Rangev[i].rused)
 133:             continue;
 134:         if (!bequal(Rangev[i].rowner, Usercode, 2))
 135:             ferror(3592, -1, i, 0);
 136:     }
 137: 
 138:     /* test for dba */
 139:     if (!bequal(Usercode, Admin.adhdr.adowner, 2))
 140:         ferror(3595, -1, Resultvar, 0);
 141: 
 142:     clr_tuple(&Prodes, &protup);
 143: 
 144:     all_pro = fillprotup(&protup);
 145: 
 146:     /* get domain reference set from target list */
 147:     /* (also, find the TREE node) */
 148:     t = Treeroot->left;
 149:     if (t->sym.type == TREE)
 150:     {
 151:         for (i = 0; i < 8; i++)
 152:             protup.prodomset[i] = -1;
 153:     }
 154:     else
 155:     {
 156:         for (i = 0; i < 8; i++)
 157:             protup.prodomset[i] = 0;
 158:         for (; t->sym.type != TREE; t = t->left)
 159:         {
 160:             if (t->right->sym.type != VAR ||
 161:                 t->sym.type != RESDOM ||
 162:                 ((struct qt_var *)t->right)->varno != Resultvar)
 163:                 syserr("d_prot: garbage tree");
 164:             lsetbit(((struct qt_var *)t->right)->attno, protup.prodomset);
 165:         }
 166:         all_pro = FALSE;
 167:     }
 168: 
 169:     /* trim off the target list, since it isn't used again */
 170:     Treeroot->left = t;
 171: 
 172:     /*
 173: 	**  Check out the target relation.
 174: 	**	We first save the varno of the relation which is
 175: 	**	getting the permit stuff.  Also, we check to see
 176: 	**	that the relation mentioned is a base relation,
 177: 	**	and not a view, since that tuple would never do
 178: 	**	anything anyway.  Finally, we clear the Resultvar
 179: 	**	so that it does not get output to the tree catalog.
 180: 	**	This would result in a 'syserr' when we tried to
 181: 	**	read it.
 182: 	*/
 183: 
 184:     protup.proresvar = Resultvar;
 185: #	ifdef xQTR3
 186:     if (Resultvar < 0)
 187:         syserr("d_prot: Rv %d", Resultvar);
 188: #	endif
 189:     if ((Rangev[Resultvar].rstat & S_VIEW) != 0)
 190:         ferror(3593, -1, Resultvar, 0); /* is a view */
 191: 
 192:     /* clear the (unused) Qmode */
 193: #	ifdef xQTR3
 194:     if (Qmode != mdDEFINE)
 195:         syserr("d_prot: Qmode %d", Qmode);
 196: #	endif
 197:     Qmode = -1;
 198: 
 199:     /*
 200: 	**  Check for PERMIT xx to ALL case.
 201: 	**	The relstat bits will be adjusted as necessary
 202: 	**	to reflect these special cases.
 203: 	**
 204: 	**	This is actually a little tricky, since we cannot
 205: 	**	afford to turn off any permissions.  If we already
 206: 	**	have some form of PERMIT xx to ALL access, we must
 207: 	**	leave it.
 208: 	*/
 209: 
 210:     relstat = Rangev[Resultvar].rstat;
 211:     if (all_pro && (protup.proopset & PRO_RETR) != 0)
 212:     {
 213:         if (protup.proopset == -1)
 214:             relstat &= ~S_PROTALL;
 215:         else
 216:         {
 217:             relstat &= ~S_PROTRET;
 218:             if ((protup.proopset & ~(PRO_RETR|PRO_AGGR|PRO_TEST)) != 0)
 219:             {
 220:                 /* some special case: still insert prot tuple */
 221:                 all_pro = FALSE;
 222:             }
 223:         }
 224:     }
 225:     else
 226:         all_pro = FALSE;    /* insert tuple if not special case */
 227: 
 228:     /* see if we are adding any tuples */
 229:     if (!all_pro)
 230:         relstat |= S_PROTUPS;
 231: 
 232:     /*
 233: 	**  Change relstat field in relation catalog
 234: 	*/
 235: 
 236:     opencatalog("relation", 2);
 237:     setkey(&Reldes, &relkey, Rangev[Resultvar].relid, RELID);
 238:     setkey(&Reldes, &relkey, Rangev[Resultvar].rowner, RELOWNER);
 239:     i = getequal(&Reldes, &relkey, &reltup, &reltid);
 240:     if (i != 0)
 241:         syserr("d_prot: geteq %d", i);
 242:     reltup.relstat = relstat;
 243:     i = replace(&Reldes, &reltid, &reltup, FALSE);
 244:     if (i != 0 && i != 1)
 245:         syserr("d_prot: repl %d", i);
 246:     if (noclose(&Reldes) != 0)
 247:         syserr("d_prot: noclose(rel)");
 248: 
 249:     Resultvar = -1;
 250: 
 251:     if (!all_pro)
 252:     {
 253:         /*
 254: 		**  Output the created tuple to the protection catalog
 255: 		**  after making other internal adjustments and deter-
 256: 		**  mining a unique sequence number (with the protect
 257: 		**  catalog locked).
 258: 		*/
 259: 
 260:         if (Treeroot->right->sym.type != QLEND)
 261:             protup.protree = puttree(Treeroot, protup.prorelid, protup.prorelown, mdPROT);
 262:         else
 263:             protup.protree = -1;
 264: 
 265:         /* compute unique permission id */
 266:         opencatalog("protect", 2);
 267:         setrll(A_SLP, Prodes.reltid, M_EXCL);
 268:         setkey(&Prodes, &prokey, protup.prorelid, PRORELID);
 269:         setkey(&Prodes, &prokey, protup.prorelown, PRORELOWN);
 270:         for (ix = 2; ; ix++)
 271:         {
 272:             setkey(&Prodes, &prokey, &ix, PROPERMID);
 273:             i = getequal(&Prodes, &prokey, &proxtup, &protid);
 274:             if (i < 0)
 275:                 syserr("d_prot: geteq");
 276:             else if (i > 0)
 277:                 break;
 278:         }
 279:         protup.propermid = ix;
 280: 
 281:         /* do actual insert */
 282:         i = insert(&Prodes, &protid, &protup, FALSE);
 283:         if (i < 0)
 284:             syserr("d_prot: insert");
 285:         if (noclose(&Prodes) != 0)
 286:             syserr("d_prot: noclose(pro)");
 287: 
 288:         /* clear the lock */
 289:         unlrl(Prodes.reltid);
 290:     }
 291:     Treeroot = NULL;
 292: }
 293: 
 294: 
 295: 
 296: 
 297: 
 298: /*
 299: **  CVT_DOW -- convert day of week
 300: **
 301: **	Converts the day of the week from string form to a number.
 302: **
 303: **	Parameters:
 304: **		sdow -- dow in string form.
 305: **
 306: **	Returns:
 307: **		0 -> 6 -- the encoded day of the week.
 308: **		-1 -- error.
 309: **
 310: **	Side Effects:
 311: **		none
 312: **
 313: **	Defines:
 314: **		Dowlist -- a mapping from day of week to number.
 315: **		cvt_dow
 316: **
 317: **	Called By:
 318: **		d_prot
 319: */
 320: 
 321: struct downame
 322: {
 323:     char    *dow_name;
 324:     int dow_num;
 325: };
 326: 
 327: struct downame  Dowlist[] =
 328: {
 329:     "sun",      0,
 330:     "sunday",   0,
 331:     "mon",      1,
 332:     "monday",   1,
 333:     "tue",      2,
 334:     "tues",     2,
 335:     "tuesday",  2,
 336:     "wed",      3,
 337:     "wednesday",    3,
 338:     "thu",      4,
 339:     "thurs",    4,
 340:     "thursday", 4,
 341:     "fri",      5,
 342:     "friday",   5,
 343:     "sat",      6,
 344:     "saturday", 6,
 345:     NULL
 346: };
 347: 
 348: cvt_dow(sdow)
 349: char    *sdow;
 350: {
 351:     register struct downame *d;
 352:     register char       *s;
 353: 
 354:     s = sdow;
 355: 
 356:     for (d = Dowlist; d->dow_name != NULL; d++)
 357:         if (sequal(d->dow_name, s))
 358:             return (d->dow_num);
 359:     return (-1);
 360: }

Defined functions

cvt_dow defined in line 348; used 2 times
d_prot defined in line 102; used 1 times

Defined variables

Dowlist defined in line 327; used 1 times

Defined struct's

downame defined in line 321; used 4 times
Last modified: 1995-02-19
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