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Diffstat (limited to 'contrib/bind9/lib/bind/irs/gen_gr.c')
-rw-r--r--contrib/bind9/lib/bind/irs/gen_gr.c492
1 files changed, 492 insertions, 0 deletions
diff --git a/contrib/bind9/lib/bind/irs/gen_gr.c b/contrib/bind9/lib/bind/irs/gen_gr.c
new file mode 100644
index 000000000000..e0c6dba52935
--- /dev/null
+++ b/contrib/bind9/lib/bind/irs/gen_gr.c
@@ -0,0 +1,492 @@
+/*
+ * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (c) 1996-1999 by Internet Software Consortium.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+ * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#if !defined(LINT) && !defined(CODECENTER)
+static const char rcsid[] = "$Id: gen_gr.c,v 1.4.2.1.4.2 2004/05/17 07:48:56 marka Exp $";
+#endif
+
+/* Imports */
+
+#include "port_before.h"
+
+#ifndef WANT_IRS_GR
+static int __bind_irs_gr_unneeded;
+#else
+
+#include <sys/types.h>
+
+#include <isc/assertions.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <netinet/in.h>
+#include <arpa/nameser.h>
+#include <resolv.h>
+
+#include <isc/memcluster.h>
+#include <irs.h>
+
+#include "port_after.h"
+
+#include "irs_p.h"
+#include "gen_p.h"
+
+/* Definitions */
+
+struct pvt {
+ struct irs_rule * rules;
+ struct irs_rule * rule;
+ struct irs_gr * gr;
+ /*
+ * Need space to store the entries read from the group file.
+ * The members list also needs space per member, and the
+ * strings making up the user names must be allocated
+ * somewhere. Rather than doing lots of small allocations,
+ * we keep one buffer and resize it as needed.
+ */
+ struct group group;
+ size_t nmemb; /* Malloc'd max index of gr_mem[]. */
+ char * membuf;
+ size_t membufsize;
+ struct __res_state * res;
+ void (*free_res)(void *);
+};
+
+/* Forward */
+
+static void gr_close(struct irs_gr *);
+static struct group * gr_next(struct irs_gr *);
+static struct group * gr_byname(struct irs_gr *, const char *);
+static struct group * gr_bygid(struct irs_gr *, gid_t);
+static void gr_rewind(struct irs_gr *);
+static int gr_list(struct irs_gr *, const char *,
+ gid_t, gid_t *, int *);
+static void gr_minimize(struct irs_gr *);
+static struct __res_state * gr_res_get(struct irs_gr *);
+static void gr_res_set(struct irs_gr *,
+ struct __res_state *,
+ void (*)(void *));
+
+static int grmerge(struct irs_gr *gr, const struct group *src,
+ int preserve);
+
+static int countvec(char **vec);
+static int isnew(char **old, char *new);
+static int countnew(char **old, char **new);
+static size_t sizenew(char **old, char **new);
+static int newgid(int, gid_t *, gid_t);
+
+/* Macros */
+
+#define FREE_IF(x) do { if ((x) != NULL) { free(x); (x) = NULL; } } while (0)
+
+/* Public */
+
+struct irs_gr *
+irs_gen_gr(struct irs_acc *this) {
+ struct gen_p *accpvt = (struct gen_p *)this->private;
+ struct irs_gr *gr;
+ struct pvt *pvt;
+
+ if (!(gr = memget(sizeof *gr))) {
+ errno = ENOMEM;
+ return (NULL);
+ }
+ memset(gr, 0x5e, sizeof *gr);
+ if (!(pvt = memget(sizeof *pvt))) {
+ memput(gr, sizeof *gr);
+ errno = ENOMEM;
+ return (NULL);
+ }
+ memset(pvt, 0, sizeof *pvt);
+ pvt->rules = accpvt->map_rules[irs_gr];
+ pvt->rule = pvt->rules;
+ gr->private = pvt;
+ gr->close = gr_close;
+ gr->next = gr_next;
+ gr->byname = gr_byname;
+ gr->bygid = gr_bygid;
+ gr->rewind = gr_rewind;
+ gr->list = gr_list;
+ gr->minimize = gr_minimize;
+ gr->res_get = gr_res_get;
+ gr->res_set = gr_res_set;
+ return (gr);
+}
+
+/* Methods. */
+
+static void
+gr_close(struct irs_gr *this) {
+ struct pvt *pvt = (struct pvt *)this->private;
+
+ memput(pvt, sizeof *pvt);
+ memput(this, sizeof *this);
+}
+
+static struct group *
+gr_next(struct irs_gr *this) {
+ struct pvt *pvt = (struct pvt *)this->private;
+ struct group *rval;
+ struct irs_gr *gr;
+
+ while (pvt->rule) {
+ gr = pvt->rule->inst->gr;
+ rval = (*gr->next)(gr);
+ if (rval)
+ return (rval);
+ if (!(pvt->rule->flags & IRS_CONTINUE))
+ break;
+ pvt->rule = pvt->rule->next;
+ if (pvt->rule) {
+ gr = pvt->rule->inst->gr;
+ (*gr->rewind)(gr);
+ }
+ }
+ return (NULL);
+}
+
+static struct group *
+gr_byname(struct irs_gr *this, const char *name) {
+ struct pvt *pvt = (struct pvt *)this->private;
+ struct irs_rule *rule;
+ struct group *tval;
+ struct irs_gr *gr;
+ int dirty;
+
+ dirty = 0;
+ for (rule = pvt->rules; rule; rule = rule->next) {
+ gr = rule->inst->gr;
+ tval = (*gr->byname)(gr, name);
+ if (tval) {
+ if (!grmerge(this, tval, dirty++))
+ return (NULL);
+ if (!(rule->flags & IRS_MERGE))
+ break;
+ } else {
+ if (!(rule->flags & IRS_CONTINUE))
+ break;
+ }
+ }
+ if (dirty)
+ return (&pvt->group);
+ return (NULL);
+}
+
+static struct group *
+gr_bygid(struct irs_gr *this, gid_t gid) {
+ struct pvt *pvt = (struct pvt *)this->private;
+ struct irs_rule *rule;
+ struct group *tval;
+ struct irs_gr *gr;
+ int dirty;
+
+ dirty = 0;
+ for (rule = pvt->rules; rule; rule = rule->next) {
+ gr = rule->inst->gr;
+ tval = (*gr->bygid)(gr, gid);
+ if (tval) {
+ if (!grmerge(this, tval, dirty++))
+ return (NULL);
+ if (!(rule->flags & IRS_MERGE))
+ break;
+ } else {
+ if (!(rule->flags & IRS_CONTINUE))
+ break;
+ }
+ }
+ if (dirty)
+ return (&pvt->group);
+ return (NULL);
+}
+
+static void
+gr_rewind(struct irs_gr *this) {
+ struct pvt *pvt = (struct pvt *)this->private;
+ struct irs_gr *gr;
+
+ pvt->rule = pvt->rules;
+ if (pvt->rule) {
+ gr = pvt->rule->inst->gr;
+ (*gr->rewind)(gr);
+ }
+}
+
+static int
+gr_list(struct irs_gr *this, const char *name,
+ gid_t basegid, gid_t *groups, int *ngroups)
+{
+ struct pvt *pvt = (struct pvt *)this->private;
+ struct irs_rule *rule;
+ struct irs_gr *gr;
+ int t_ngroups, maxgroups;
+ gid_t *t_groups;
+ int n, t, rval = 0;
+
+ maxgroups = *ngroups;
+ *ngroups = 0;
+ t_groups = (gid_t *)malloc(maxgroups * sizeof(gid_t));
+ if (!t_groups) {
+ errno = ENOMEM;
+ return (-1);
+ }
+
+ for (rule = pvt->rules; rule; rule = rule->next) {
+ t_ngroups = maxgroups;
+ gr = rule->inst->gr;
+ t = (*gr->list)(gr, name, basegid, t_groups, &t_ngroups);
+ for (n = 0; n < t_ngroups; n++) {
+ if (newgid(*ngroups, groups, t_groups[n])) {
+ if (*ngroups == maxgroups) {
+ rval = -1;
+ goto done;
+ }
+ groups[(*ngroups)++] = t_groups[n];
+ }
+ }
+ if (t == 0) {
+ if (!(rule->flags & IRS_MERGE))
+ break;
+ } else {
+ if (!(rule->flags & IRS_CONTINUE))
+ break;
+ }
+ }
+ done:
+ free(t_groups);
+ return (rval);
+}
+
+static void
+gr_minimize(struct irs_gr *this) {
+ struct pvt *pvt = (struct pvt *)this->private;
+ struct irs_rule *rule;
+
+ for (rule = pvt->rules; rule != NULL; rule = rule->next) {
+ struct irs_gr *gr = rule->inst->gr;
+
+ (*gr->minimize)(gr);
+ }
+}
+
+static struct __res_state *
+gr_res_get(struct irs_gr *this) {
+ struct pvt *pvt = (struct pvt *)this->private;
+
+ if (!pvt->res) {
+ struct __res_state *res;
+ res = (struct __res_state *)malloc(sizeof *res);
+ if (!res) {
+ errno = ENOMEM;
+ return (NULL);
+ }
+ memset(res, 0, sizeof *res);
+ gr_res_set(this, res, free);
+ }
+
+ return (pvt->res);
+}
+
+static void
+gr_res_set(struct irs_gr *this, struct __res_state *res,
+ void (*free_res)(void *)) {
+ struct pvt *pvt = (struct pvt *)this->private;
+ struct irs_rule *rule;
+
+ if (pvt->res && pvt->free_res) {
+ res_nclose(pvt->res);
+ (*pvt->free_res)(pvt->res);
+ }
+
+ pvt->res = res;
+ pvt->free_res = free_res;
+
+ for (rule = pvt->rules; rule != NULL; rule = rule->next) {
+ struct irs_gr *gr = rule->inst->gr;
+
+ if (gr->res_set)
+ (*gr->res_set)(gr, pvt->res, NULL);
+ }
+}
+
+/* Private. */
+
+static int
+grmerge(struct irs_gr *this, const struct group *src, int preserve) {
+ struct pvt *pvt = (struct pvt *)this->private;
+ char *cp, **m, **p, *oldmembuf, *ep;
+ int n, ndst, nnew;
+ size_t used;
+
+ if (!preserve) {
+ pvt->group.gr_gid = src->gr_gid;
+ if (pvt->nmemb < 1) {
+ m = malloc(sizeof *m);
+ if (m == NULL) {
+ /* No harm done, no work done. */
+ return (0);
+ }
+ pvt->group.gr_mem = m;
+ pvt->nmemb = 1;
+ }
+ pvt->group.gr_mem[0] = NULL;
+ }
+ ndst = countvec(pvt->group.gr_mem);
+ nnew = countnew(pvt->group.gr_mem, src->gr_mem);
+
+ /*
+ * Make sure destination member array is large enough.
+ * p points to new portion.
+ */
+ n = ndst + nnew + 1;
+ if ((size_t)n > pvt->nmemb) {
+ m = realloc(pvt->group.gr_mem, n * sizeof *m);
+ if (m == NULL) {
+ /* No harm done, no work done. */
+ return (0);
+ }
+ pvt->group.gr_mem = m;
+ pvt->nmemb = n;
+ }
+ p = pvt->group.gr_mem + ndst;
+
+ /*
+ * Enlarge destination membuf; cp points at new portion.
+ */
+ n = sizenew(pvt->group.gr_mem, src->gr_mem);
+ INSIST((nnew == 0) == (n == 0));
+ if (!preserve) {
+ n += strlen(src->gr_name) + 1;
+ n += strlen(src->gr_passwd) + 1;
+ }
+ if (n == 0) {
+ /* No work to do. */
+ return (1);
+ }
+ used = preserve ? pvt->membufsize : 0;
+ cp = malloc(used + n);
+ if (cp == NULL) {
+ /* No harm done, no work done. */
+ return (0);
+ }
+ ep = cp + used + n;
+ if (used != 0)
+ memcpy(cp, pvt->membuf, used);
+ oldmembuf = pvt->membuf;
+ pvt->membuf = cp;
+ pvt->membufsize = used + n;
+ cp += used;
+
+ /*
+ * Adjust group.gr_mem.
+ */
+ if (pvt->membuf != oldmembuf)
+ for (m = pvt->group.gr_mem; *m; m++)
+ *m = pvt->membuf + (*m - oldmembuf);
+
+ /*
+ * Add new elements.
+ */
+ for (m = src->gr_mem; *m; m++)
+ if (isnew(pvt->group.gr_mem, *m)) {
+ *p++ = cp;
+ *p = NULL;
+ n = strlen(*m) + 1;
+ if (n > ep - cp) {
+ FREE_IF(oldmembuf);
+ return (0);
+ }
+ strcpy(cp, *m); /* (checked) */
+ cp += n;
+ }
+ if (preserve) {
+ pvt->group.gr_name = pvt->membuf +
+ (pvt->group.gr_name - oldmembuf);
+ pvt->group.gr_passwd = pvt->membuf +
+ (pvt->group.gr_passwd - oldmembuf);
+ } else {
+ pvt->group.gr_name = cp;
+ n = strlen(src->gr_name) + 1;
+ if (n > ep - cp) {
+ FREE_IF(oldmembuf);
+ return (0);
+ }
+ strcpy(cp, src->gr_name); /* (checked) */
+ cp += n;
+
+ pvt->group.gr_passwd = cp;
+ n = strlen(src->gr_passwd) + 1;
+ if (n > ep - cp) {
+ FREE_IF(oldmembuf);
+ return (0);
+ }
+ strcpy(cp, src->gr_passwd); /* (checked) */
+ cp += n;
+ }
+ FREE_IF(oldmembuf);
+ INSIST(cp >= pvt->membuf && cp <= &pvt->membuf[pvt->membufsize]);
+ return (1);
+}
+
+static int
+countvec(char **vec) {
+ int n = 0;
+
+ while (*vec++)
+ n++;
+ return (n);
+}
+
+static int
+isnew(char **old, char *new) {
+ for (; *old; old++)
+ if (strcmp(*old, new) == 0)
+ return (0);
+ return (1);
+}
+
+static int
+countnew(char **old, char **new) {
+ int n = 0;
+
+ for (; *new; new++)
+ n += isnew(old, *new);
+ return (n);
+}
+
+static size_t
+sizenew(char **old, char **new) {
+ size_t n = 0;
+
+ for (; *new; new++)
+ if (isnew(old, *new))
+ n += strlen(*new) + 1;
+ return (n);
+}
+
+static int
+newgid(int ngroups, gid_t *groups, gid_t group) {
+ ngroups--, groups++;
+ for (; ngroups-- > 0; groups++)
+ if (*groups == group)
+ return (0);
+ return (1);
+}
+
+#endif /* WANT_IRS_GR */
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