3 * $Id: bcquery.c,v 1.2 1998/06/26 10:32:31 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 1.2 1998/06/26 10:32:31 mdw
33 * Cosmetic change: use sizeof(destination) in memcpy.
35 * Revision 1.1 1998/04/23 13:20:20 mdw
36 * Added new program to verify and query Become configuration files.
40 /*----- Header files ------------------------------------------------------*/
42 /* --- ANSI headers --- */
52 /* --- Unix headers --- */
54 #include <sys/types.h>
56 #include <sys/socket.h>
57 #include <sys/utsname.h>
59 #include <netinet/in.h>
61 #include <arpa/inet.h>
69 /* --- Local headers --- */
85 /*----- Type definitions --------------------------------------------------*/
97 typedef struct qnode {
111 #define q_right q.q.r
115 /*----- Static variables --------------------------------------------------*/
132 static unsigned flags;
133 static const char *cf = file_RULES;
134 static unsigned outmask = cat_where | cat_from | cat_to | cat_what;
136 /*----- Low-level options handling ----------------------------------------*/
138 /* --- @optname@ --- *
142 * Returns: Pointer to a string describing the current option.
144 * Use: Creates a textual description of an option for use in
148 static const char *optname(void)
152 case 'H': return ("-host");
153 case 'F': return ("-from");
154 case 'T': return ("-to");
155 case 'C': return ("-command");
156 case 0: return (optarg);
157 case '(': case ')': case '&': case '|': case '!':
161 case EOF: return ("<eof>");
162 default: return ("<unknown>");
166 /* --- @nextopt@ --- *
170 * Returns: Next option id, or @EOF@.
172 * Use: Reads the next option. Does a lot of the messy work of
176 static int nextopt(void)
178 const static struct option opts[] = {
179 { "help", 0, 0, 'h' },
181 { "file", gFlag_argReq, 0, 'f' },
182 { "dump", 0, 0, 'd' },
183 { "check", 0, 0, 'k' },
185 { "output", gFlag_argReq, 0, 'o' },
186 { "columns", 0, 0, '|' },
187 { "rows", 0, 0, '-' },
188 { "nohead", 0, 0, 'n' },
190 { "host", gFlag_argReq, 0, 'H' },
191 { "from", gFlag_argReq, 0, 'F' },
192 { "to", gFlag_argReq, 0, 'T' },
193 { "command", gFlag_argReq, 0, 'C' },
195 { "and", 0, 0, '&' },
197 { "not", 0, 0, '!' },
203 opt = mdwopt(ac, av, "-", opts, 0, 0, gFlag_noShorts);
208 "Usage: %s [-help]\n"
209 " %s [-output COLS] [-dump] [-file FILE] [EXPR | -check]\n"
211 "Reads the `become' configuration file FILE (or " file_RULES " by\n"
212 "default) and writes the rules which match the EXPR.\n"
214 "EXPR may make use of the following operators: `-host HOST', `-from USER',\n"
215 "`-to USER', and `-command CMD'. You may join them together with `-and',\n"
216 "`-or' and `-not' operators (which may be spelled `&', `|' and `!' if you\n"
217 "prefer), and group subexpressions with parentheses `(' and `)'.\n",
240 enum { m_replace, m_add, m_remove } mode = m_replace;
264 die("unknown column specifier `%c'", *p);
267 if (mode == m_replace) {
273 else if (mode == m_remove)
276 die("bad mode while setting output mask: %u", mode);
284 die("type `%s --help' for usage information", quis());
286 if (optarg[0] && optarg[1] == 0) switch (optarg[0]) {
288 case '&': case '|': case '!':
293 die("unexpected text `%s' found", optarg);
300 /*----- Recursive descent query parser ------------------------------------*/
302 /* --- @qparse@ --- *
306 * Returns: A pointer to the finished tree.
308 * Use: Scans the command line arguments and makes them into a tree.
311 static qnode *qparse_expr(void);
313 static qnode *qparse_atom(void)
321 die("syntax error: expected `)', found `%s'", optname());
327 qnode *q = xmalloc(sizeof(*q));
328 h = gethostbyname(optarg);
330 die("unknown host `%s'", optarg);
331 q->q_cat = cat_where;
332 memcpy(&q->q_in, h->h_addr, sizeof(q->q_in));
336 case 'F': case 'T': {
337 qnode *q = xmalloc(sizeof(*q));
338 q->q_cat = (opt == 'F' ? cat_from : cat_to);
339 if (isdigit((unsigned char)optarg[0]))
340 q->q_uid = atoi(optarg);
343 if (!(flags & f_userdb)) {
349 pw = userdb_userByName(optarg);
351 die("unknown user `%s'", optarg);
352 q->q_uid = pw->pw_uid;
358 qnode *q = xmalloc(sizeof(*q));
365 die("unexpected token: `%s'", optname());
370 static qnode *qparse_factor(void)
373 qnode *q = xmalloc(sizeof(*q));
376 q->q_arg = qparse_atom();
379 return (qparse_atom());
382 static qnode *qparse_term(void)
384 qnode *top, *q, **qq;
392 case 'H': case 'F': case 'T': case 'C': case '!': case '(':
393 *qq = xmalloc(sizeof(*q));
394 (*qq)->q_cat = cat_and;
396 qq = &(*qq)->q_right;
405 static qnode *qparse_expr(void)
407 qnode *top, *q, **qq;
415 *qq = xmalloc(sizeof(*q));
416 (*qq)->q_cat = cat_or;
418 qq = &(*qq)->q_right;
427 static qnode *qparse(void)
435 die("syntax error: `%s' unexpected", optname());
439 /* --- @dumptree@ --- *
441 * Arguments: @qnode *q@ = pointer to tree to dump
442 * @int indent@ = indentation for this subtree
446 * Use: Dumps a tree to stdout for debugging purposes.
449 static void dumptree(qnode *q, int indent)
452 printf("<empty> -- magic query which matches everything\n");
455 printf("%*s", indent * 2, "");
459 printf("host = %s\n", inet_ntoa(q->q_in));
462 printf("from = %u\n", (unsigned)q->q_uid);
465 printf("to = %u\n", (unsigned)q->q_uid);
468 printf("command = `%s'\n", q->q_cmd);
476 unsigned cat = q->q_cat;
477 printf(cat == cat_and ? "and\n" : "or\n");
478 while (q->q_cat == cat) {
479 dumptree(q->q_left, indent);
485 printf("unknown type %u\n", q->q_cat);
489 /*----- Recursive query matching ------------------------------------------*/
491 /* --- @checkrule@ --- *
493 * Arguments: @rule *r@ = pointer to a rule
494 * @qnode *q@ = pointer to a query tree
496 * Returns: Nonzero if the query matches the rule.
498 * Use: Matches rules and queries.
501 static int checkrule(rule *r, qnode *q)
506 /* --- Handle the compound query types --- */
509 return (!checkrule(r, q->q_arg));
512 if (!checkrule(r, q->q_left))
518 if (checkrule(r, q->q_left))
523 /* --- And now the simple query types --- */
526 return (class_matchHost(r->host, q->q_in));
528 return (class_matchUser(r->from, q->q_uid));
530 return (class_matchUser(r->to, q->q_uid));
532 return (class_matchCommand(r->cmd, q->q_cmd));
535 /* --- Anything else is bogus (and a bug) --- */
537 die("unexpected cat code %u in checkrule", q->q_cat);
541 /*----- Rule output -------------------------------------------------------*/
543 /* --- @showrule@ --- *
545 * Arguments: @rule *r@ = pointer to a rule block
549 * Use: Writes a rule block to the output in a pleasant way.
552 static const char *xltuser(uid_t u)
555 struct passwd *pw = userdb_userById(u);
557 return (pw->pw_name);
558 sprintf(buf, "%u", (unsigned)u);
562 static void classfirstrow(class_node *c, const char *fmt, sym_iter *i,
563 unsigned bit, unsigned *imask)
565 switch (c->type & clNode_mask) {
567 printf(fmt, (c == class_all ? "ALL" :
568 c == class_none ? "NONE" :
572 printf(fmt, (c->type & clType_user) ? xltuser(c->v.u) : c->v.s);
576 sym_createIter(i, &c->v.t);
581 } else if (c->type & clType_user)
582 printf(fmt, xltuser(*(uid_t *)b->name));
584 printf(fmt, b->name);
588 printf(fmt, "<complex>");
593 static void showclass(class_node *c,
594 void (*sc)(class_node *c),
595 void (*sh)(sym_base *b))
600 switch (c->type & clNode_mask) {
602 fputs(c == class_all ? "ALL" :
603 c == class_none ? "NONE" : "<buggy>",
612 sym_createIter(&i, &c->v.t);
614 if ((b = sym_next(&i)) != 0) {
616 while ((b = sym_next(&i)) != 0) {
633 fputs("<unknown node type>", stdout);
636 type = c->type & clNode_mask;
639 showclass(c->v.c.l, sc, sh);
642 } while ((c->type & clNode_mask) == type);
643 showclass(c, sc, sh);
649 static void showuseri(class_node *c) { fputs(xltuser(c->v.u), stdout); }
651 static void showuserh(sym_base *b)
653 fputs(xltuser(*(uid_t *)b->name), stdout);
656 static void showstringi(class_node *c) { fputs(c->v.s, stdout); }
658 static void showstringh(sym_base *b) { fputs(b->name, stdout); }
660 static void showrule(rule *r)
662 /* --- First up: display of simple classes in columns --- */
664 if (flags & f_simple) {
666 sym_base *w = 0, *x = 0, *y = 0, *z = 0;
669 /* --- Print the header line if necessary --- */
671 if (!(flags & f_header)) {
672 if (!(flags & f_nohead)) {
673 if (outmask & cat_from) printf("%-15s ", "FROM");
674 if (outmask & cat_to) printf("%-15s ", "TO");
675 if (outmask & cat_where) printf("%-24s ", "HOST");
676 if (outmask & cat_what) printf("%s", "COMMAND");
684 /* --- Print out the first row --- */
686 if (outmask & cat_from)
687 classfirstrow(r->from, "%-15.15s ", &a, cat_from, &imask);
688 if (outmask & cat_to)
689 classfirstrow(r->to, "%-15.15s ", &b, cat_to, &imask);
690 if (outmask & cat_where)
691 classfirstrow(r->host, "%-24.24s ", &c, cat_where, &imask);
692 if (outmask & cat_what)
693 classfirstrow(r->cmd, "%s", &d, cat_what, &imask);
696 /* --- And now for the rest --- */
699 if ((imask & cat_from) && (w = sym_next(&a)) == 0)
701 if ((imask & cat_to) && (x = sym_next(&b)) == 0)
703 if ((imask & cat_where) && (y = sym_next(&c)) == 0)
705 if ((imask & cat_what) && (z = sym_next(&d)) == 0)
711 if (outmask & cat_from) {
713 !(imask & cat_from) ? "" : xltuser(*(uid_t *)w->name));
716 if (outmask & cat_to) {
718 !(imask & cat_to) ? "" : xltuser(*(uid_t *)x->name));
721 if (outmask & cat_where)
722 printf("%-24.24s ", !(imask & cat_where) ? "" : y->name);
724 if (outmask & cat_what)
725 printf("%s", !(imask & cat_what) ? "" : z->name);
731 /* --- Otherwise deal with complex cases --- */
734 if (flags & f_header)
738 if (outmask & cat_from) {
739 fputs(" From: ", stdout);
740 showclass(r->from, showuseri, showuserh);
743 if (outmask & cat_to) {
744 fputs(" To: ", stdout);
745 showclass(r->to, showuseri, showuserh);
748 if (outmask & cat_where) {
749 fputs(" Hosts: ", stdout);
750 showclass(r->host, showstringi, showstringh);
753 if (outmask & cat_what) {
754 fputs("Commands: ", stdout);
755 showclass(r->cmd, showstringi, showstringh);
761 /*----- Dummy functions ---------------------------------------------------*/
763 void daemon_usePort(int p) { ; }
764 void daemon_readKey(const char *f) { ; }
766 /*----- Main code ---------------------------------------------------------*/
770 * Arguments: @int argc@ = number of command line arguments
771 * @char *argv[]@ = pointer to command line arguments
773 * Returns: Zero if all went OK.
775 * Use: Verifies and queries the `become' configuration file.
778 int main(int argc, char *argv[])
782 /* --- Initialise things --- */
785 ac = argc; av = argv;
787 /* --- Read the query tree --- */
791 /* --- Dump the tree if so requested --- */
793 if (flags & f_dump) {
798 /* --- Check columns requested --- */
800 if (outmask == (outmask & (outmask - 1)))
803 /* --- Read the ruleset --- */
805 if (!(flags & f_userdb)) {
816 FILE *fp = fopen(cf, "r");
820 die("couldn't open configuration file `%s': %s", cf, strerror(errno));
827 /* --- Now scan the query --- */
830 rule *rl = rule_list(), *r;
832 /* --- Decide on output format if not already chosen --- */
834 if (!(flags & f_force)) {
838 if ((!qtree || checkrule(r, qtree)) &&
839 ((r->host->type & clNode_mask) >= clNode_binop ||
840 (r->from->type & clNode_mask) >= clNode_binop ||
841 (r->to->type & clNode_mask) >= clNode_binop ||
842 (r->cmd->type & clNode_mask) >= clNode_binop)) {
850 /* --- Now just dump the matching items --- */
854 if (!qtree || checkrule(r, qtree)) {
864 if (!(flags & f_match))
869 /*----- That's all, folks -------------------------------------------------*/