3 * $Id: bcquery.c,v 1.1 1998/04/23 13:20:20 mdw Exp $
5 * Query and dump Become's configuration file
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of `become'
14 * `Become' is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
19 * `Become' is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with `become'; if not, write to the Free Software Foundation,
26 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
29 /*----- Revision history --------------------------------------------------*
32 * Revision 1.1 1998/04/23 13:20:20 mdw
33 * Added new program to verify and query Become configuration files.
37 /*----- Header files ------------------------------------------------------*/
39 /* --- ANSI headers --- */
49 /* --- Unix headers --- */
51 #include <sys/types.h>
53 #include <sys/socket.h>
54 #include <sys/utsname.h>
56 #include <netinet/in.h>
58 #include <arpa/inet.h>
66 /* --- Local headers --- */
82 /*----- Type definitions --------------------------------------------------*/
94 typedef struct qnode {
108 #define q_right q.q.r
112 /*----- Static variables --------------------------------------------------*/
129 static unsigned flags;
130 static const char *cf = file_RULES;
131 static unsigned outmask = cat_where | cat_from | cat_to | cat_what;
133 /*----- Low-level options handling ----------------------------------------*/
135 /* --- @optname@ --- *
139 * Returns: Pointer to a string describing the current option.
141 * Use: Creates a textual description of an option for use in
145 static const char *optname(void)
149 case 'H': return ("-host");
150 case 'F': return ("-from");
151 case 'T': return ("-to");
152 case 'C': return ("-command");
153 case 0: return (optarg);
154 case '(': case ')': case '&': case '|': case '!':
158 case EOF: return ("<eof>");
159 default: return ("<unknown>");
163 /* --- @nextopt@ --- *
167 * Returns: Next option id, or @EOF@.
169 * Use: Reads the next option. Does a lot of the messy work of
173 static int nextopt(void)
175 const static struct option opts[] = {
176 { "help", 0, 0, 'h' },
178 { "file", gFlag_argReq, 0, 'f' },
179 { "dump", 0, 0, 'd' },
180 { "check", 0, 0, 'k' },
182 { "output", gFlag_argReq, 0, 'o' },
183 { "columns", 0, 0, '|' },
184 { "rows", 0, 0, '-' },
185 { "nohead", 0, 0, 'n' },
187 { "host", gFlag_argReq, 0, 'H' },
188 { "from", gFlag_argReq, 0, 'F' },
189 { "to", gFlag_argReq, 0, 'T' },
190 { "command", gFlag_argReq, 0, 'C' },
192 { "and", 0, 0, '&' },
194 { "not", 0, 0, '!' },
200 opt = mdwopt(ac, av, "-", opts, 0, 0, gFlag_noShorts);
205 "Usage: %s [-help]\n"
206 " %s [-output COLS] [-dump] [-file FILE] [EXPR | -check]\n"
208 "Reads the `become' configuration file FILE (or " file_RULES " by\n"
209 "default) and writes the rules which match the EXPR.\n"
211 "EXPR may make use of the following operators: `-host HOST', `-from USER',\n"
212 "`-to USER', and `-command CMD'. You may join them together with `-and',\n"
213 "`-or' and `-not' operators (which may be spelled `&', `|' and `!' if you\n"
214 "prefer), and group subexpressions with parentheses `(' and `)'.\n",
237 enum { m_replace, m_add, m_remove } mode = m_replace;
261 die("unknown column specifier `%c'", *p);
264 if (mode == m_replace) {
270 else if (mode == m_remove)
273 die("bad mode while setting output mask: %u", mode);
281 die("type `%s --help' for usage information", quis());
283 if (optarg[0] && optarg[1] == 0) switch (optarg[0]) {
285 case '&': case '|': case '!':
290 die("unexpected text `%s' found", optarg);
297 /*----- Recursive descent query parser ------------------------------------*/
299 /* --- @qparse@ --- *
303 * Returns: A pointer to the finished tree.
305 * Use: Scans the command line arguments and makes them into a tree.
308 static qnode *qparse_expr(void);
310 static qnode *qparse_atom(void)
318 die("syntax error: expected `)', found `%s'", optname());
324 qnode *q = xmalloc(sizeof(*q));
325 h = gethostbyname(optarg);
327 die("unknown host `%s'", optarg);
328 q->q_cat = cat_where;
329 memcpy(&q->q_in, h->h_addr, sizeof(struct in_addr));
333 case 'F': case 'T': {
334 qnode *q = xmalloc(sizeof(*q));
335 q->q_cat = (opt == 'F' ? cat_from : cat_to);
336 if (isdigit((unsigned char)optarg[0]))
337 q->q_uid = atoi(optarg);
340 if (!(flags & f_userdb)) {
346 pw = userdb_userByName(optarg);
348 die("unknown user `%s'", optarg);
349 q->q_uid = pw->pw_uid;
355 qnode *q = xmalloc(sizeof(*q));
362 die("unexpected token: `%s'", optname());
367 static qnode *qparse_factor(void)
370 qnode *q = xmalloc(sizeof(*q));
373 q->q_arg = qparse_atom();
376 return (qparse_atom());
379 static qnode *qparse_term(void)
381 qnode *top, *q, **qq;
389 case 'H': case 'F': case 'T': case 'C': case '!': case '(':
390 *qq = xmalloc(sizeof(*q));
391 (*qq)->q_cat = cat_and;
393 qq = &(*qq)->q_right;
402 static qnode *qparse_expr(void)
404 qnode *top, *q, **qq;
412 *qq = xmalloc(sizeof(*q));
413 (*qq)->q_cat = cat_or;
415 qq = &(*qq)->q_right;
424 static qnode *qparse(void)
432 die("syntax error: `%s' unexpected", optname());
436 /* --- @dumptree@ --- *
438 * Arguments: @qnode *q@ = pointer to tree to dump
439 * @int indent@ = indentation for this subtree
443 * Use: Dumps a tree to stdout for debugging purposes.
446 static void dumptree(qnode *q, int indent)
449 printf("<empty> -- magic query which matches everything\n");
452 printf("%*s", indent * 2, "");
456 printf("host = %s\n", inet_ntoa(q->q_in));
459 printf("from = %u\n", (unsigned)q->q_uid);
462 printf("to = %u\n", (unsigned)q->q_uid);
465 printf("command = `%s'\n", q->q_cmd);
473 unsigned cat = q->q_cat;
474 printf(cat == cat_and ? "and\n" : "or\n");
475 while (q->q_cat == cat) {
476 dumptree(q->q_left, indent);
482 printf("unknown type %u\n", q->q_cat);
486 /*----- Recursive query matching ------------------------------------------*/
488 /* --- @checkrule@ --- *
490 * Arguments: @rule *r@ = pointer to a rule
491 * @qnode *q@ = pointer to a query tree
493 * Returns: Nonzero if the query matches the rule.
495 * Use: Matches rules and queries.
498 static int checkrule(rule *r, qnode *q)
503 /* --- Handle the compound query types --- */
506 return (!checkrule(r, q->q_arg));
509 if (!checkrule(r, q->q_left))
515 if (checkrule(r, q->q_left))
520 /* --- And now the simple query types --- */
523 return (class_matchHost(r->host, q->q_in));
525 return (class_matchUser(r->from, q->q_uid));
527 return (class_matchUser(r->to, q->q_uid));
529 return (class_matchCommand(r->cmd, q->q_cmd));
532 /* --- Anything else is bogus (and a bug) --- */
534 die("unexpected cat code %u in checkrule", q->q_cat);
538 /*----- Rule output -------------------------------------------------------*/
540 /* --- @showrule@ --- *
542 * Arguments: @rule *r@ = pointer to a rule block
546 * Use: Writes a rule block to the output in a pleasant way.
549 static const char *xltuser(uid_t u)
552 struct passwd *pw = userdb_userById(u);
554 return (pw->pw_name);
555 sprintf(buf, "%u", (unsigned)u);
559 static void classfirstrow(class_node *c, const char *fmt, sym_iter *i,
560 unsigned bit, unsigned *imask)
562 switch (c->type & clNode_mask) {
564 printf(fmt, (c == class_all ? "ALL" :
565 c == class_none ? "NONE" :
569 printf(fmt, (c->type & clType_user) ? xltuser(c->v.u) : c->v.s);
573 sym_createIter(i, &c->v.t);
578 } else if (c->type & clType_user)
579 printf(fmt, xltuser(*(uid_t *)b->name));
581 printf(fmt, b->name);
585 printf(fmt, "<complex>");
590 static void showclass(class_node *c,
591 void (*sc)(class_node *c),
592 void (*sh)(sym_base *b))
597 switch (c->type & clNode_mask) {
599 fputs(c == class_all ? "ALL" :
600 c == class_none ? "NONE" : "<buggy>",
609 sym_createIter(&i, &c->v.t);
611 if ((b = sym_next(&i)) != 0) {
613 while ((b = sym_next(&i)) != 0) {
630 fputs("<unknown node type>", stdout);
633 type = c->type & clNode_mask;
636 showclass(c->v.c.l, sc, sh);
639 } while ((c->type & clNode_mask) == type);
640 showclass(c, sc, sh);
646 static void showuseri(class_node *c) { fputs(xltuser(c->v.u), stdout); }
648 static void showuserh(sym_base *b)
650 fputs(xltuser(*(uid_t *)b->name), stdout);
653 static void showstringi(class_node *c) { fputs(c->v.s, stdout); }
655 static void showstringh(sym_base *b) { fputs(b->name, stdout); }
657 static void showrule(rule *r)
659 /* --- First up: display of simple classes in columns --- */
661 if (flags & f_simple) {
663 sym_base *w = 0, *x = 0, *y = 0, *z = 0;
666 /* --- Print the header line if necessary --- */
668 if (!(flags & f_header)) {
669 if (!(flags & f_nohead)) {
670 if (outmask & cat_from) printf("%-15s ", "FROM");
671 if (outmask & cat_to) printf("%-15s ", "TO");
672 if (outmask & cat_where) printf("%-24s ", "HOST");
673 if (outmask & cat_what) printf("%s", "COMMAND");
681 /* --- Print out the first row --- */
683 if (outmask & cat_from)
684 classfirstrow(r->from, "%-15.15s ", &a, cat_from, &imask);
685 if (outmask & cat_to)
686 classfirstrow(r->to, "%-15.15s ", &b, cat_to, &imask);
687 if (outmask & cat_where)
688 classfirstrow(r->host, "%-24.24s ", &c, cat_where, &imask);
689 if (outmask & cat_what)
690 classfirstrow(r->cmd, "%s", &d, cat_what, &imask);
693 /* --- And now for the rest --- */
696 if ((imask & cat_from) && (w = sym_next(&a)) == 0)
698 if ((imask & cat_to) && (x = sym_next(&b)) == 0)
700 if ((imask & cat_where) && (y = sym_next(&c)) == 0)
702 if ((imask & cat_what) && (z = sym_next(&d)) == 0)
708 if (outmask & cat_from) {
710 !(imask & cat_from) ? "" : xltuser(*(uid_t *)w->name));
713 if (outmask & cat_to) {
715 !(imask & cat_to) ? "" : xltuser(*(uid_t *)x->name));
718 if (outmask & cat_where)
719 printf("%-24.24s ", !(imask & cat_where) ? "" : y->name);
721 if (outmask & cat_what)
722 printf("%s", !(imask & cat_what) ? "" : z->name);
728 /* --- Otherwise deal with complex cases --- */
731 if (flags & f_header)
735 if (outmask & cat_from) {
736 fputs(" From: ", stdout);
737 showclass(r->from, showuseri, showuserh);
740 if (outmask & cat_to) {
741 fputs(" To: ", stdout);
742 showclass(r->to, showuseri, showuserh);
745 if (outmask & cat_where) {
746 fputs(" Hosts: ", stdout);
747 showclass(r->host, showstringi, showstringh);
750 if (outmask & cat_what) {
751 fputs("Commands: ", stdout);
752 showclass(r->cmd, showstringi, showstringh);
758 /*----- Dummy functions ---------------------------------------------------*/
760 void daemon_usePort(int p) { ; }
761 void daemon_readKey(const char *f) { ; }
763 /*----- Main code ---------------------------------------------------------*/
767 * Arguments: @int argc@ = number of command line arguments
768 * @char *argv[]@ = pointer to command line arguments
770 * Returns: Zero if all went OK.
772 * Use: Verifies and queries the `become' configuration file.
775 int main(int argc, char *argv[])
779 /* --- Initialise things --- */
782 ac = argc; av = argv;
784 /* --- Read the query tree --- */
788 /* --- Dump the tree if so requested --- */
790 if (flags & f_dump) {
795 /* --- Check columns requested --- */
797 if (outmask == (outmask & (outmask - 1)))
800 /* --- Read the ruleset --- */
802 if (!(flags & f_userdb)) {
813 FILE *fp = fopen(cf, "r");
817 die("couldn't open configuration file `%s': %s", cf, strerror(errno));
824 /* --- Now scan the query --- */
827 rule *rl = rule_list(), *r;
829 /* --- Decide on output format if not already chosen --- */
831 if (!(flags & f_force)) {
835 if ((!qtree || checkrule(r, qtree)) &&
836 ((r->host->type & clNode_mask) >= clNode_binop ||
837 (r->from->type & clNode_mask) >= clNode_binop ||
838 (r->to->type & clNode_mask) >= clNode_binop ||
839 (r->cmd->type & clNode_mask) >= clNode_binop)) {
847 /* --- Now just dump the matching items --- */
851 if (!qtree || checkrule(r, qtree)) {
861 if (!(flags & f_match))
866 /*----- That's all, folks -------------------------------------------------*/