s4-dns: ndr_dnsp helper functions

these handle the dnsp_name type

1 files changed, 98 insertions, 0 deletions

diff --git a/librpc/ndr/ndr_dnsp.c b/librpc/ndr/ndr_dnsp.c
new file mode 100644
index 0000000000..f24b5dbf79
--- /dev/null
+++ b/librpc/ndr/ndr_dnsp.c
@@ -0,0 +1,98 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   Manually parsed structures found in DNSP
+
+   Copyright (C) Andrew Tridgell 2010
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "librpc/gen_ndr/ndr_dnsp.h"
+
+/*
+  print a dnsp_name
+*/
+_PUBLIC_ void ndr_print_dnsp_name(struct ndr_print *ndr, const char *name,
+				  const char *dns_name)
+{
+	ndr->print(ndr, "%-25s: %s", name, dns_name);
+}
+
+/*
+  pull a dnsp_name
+*/
+_PUBLIC_ enum ndr_err_code ndr_pull_dnsp_name(struct ndr_pull *ndr, int ndr_flags, const char **name)
+{
+	uint8_t len, count;
+	int i;
+	uint32_t total_len;
+	char *ret;
+
+	NDR_CHECK(ndr_pull_uint8(ndr, ndr_flags, &len));
+	NDR_CHECK(ndr_pull_uint8(ndr, ndr_flags, &count));
+
+	ret = talloc_strdup(ndr->current_mem_ctx, "");
+	if (!ret) {
+		return ndr_pull_error(ndr, NDR_ERR_ALLOC, "Failed to pull dnsp");
+	}
+	total_len = 1;
+
+	for (i=0; i<count; i++) {
+		uint8_t sublen, newlen;
+		NDR_CHECK(ndr_pull_uint8(ndr, ndr_flags, &sublen));
+		newlen = total_len + sublen;
+		if (i != count-1) {
+			newlen++; /* for the '.' */
+		}
+		ret = talloc_realloc(ndr->current_mem_ctx, ret, char, newlen);
+		if (!ret) {
+			return ndr_pull_error(ndr, NDR_ERR_ALLOC, "Failed to pull dnsp");
+		}
+		NDR_CHECK(ndr_pull_bytes(ndr, (uint8_t *)&ret[total_len-1], sublen));
+		if (i != count-1) {
+			ret[newlen-2] = '.';
+		}
+		ret[newlen-1] = 0;
+		total_len = newlen;
+	}
+	(*name) = ret;
+	return NDR_ERR_SUCCESS;
+}
+
+enum ndr_err_code ndr_push_dnsp_name(struct ndr_push *ndr, int ndr_flags, const char *name)
+{
+	int count, total_len, i;
+	/* count the dots */
+	for (count=i=0; name[i]; i++) {
+		if (name[i] == '.') count++;
+	}
+	total_len = strlen(name) + 1;
+	if (total_len > 255 || count > 255) {
+		return ndr_push_error(ndr, NDR_ERR_BUFSIZE,
+				      "dns_name of length %d larger than 255", total_len);
+	}
+	NDR_CHECK(ndr_push_uint8(ndr, ndr_flags, (uint8_t)total_len));
+	NDR_CHECK(ndr_push_uint8(ndr, ndr_flags, (uint8_t)count));
+	for (i=0; i<count; i++) {
+		const char *p = strchr(name, '.');
+		size_t sublen = p?(p-name):strlen(name);
+		NDR_CHECK(ndr_push_uint8(ndr, ndr_flags, (uint8_t)sublen));
+		NDR_CHECK(ndr_push_bytes(ndr, (const uint8_t *)name, sublen));
+		name += sublen + 1;
+	}
+
+	return NDR_ERR_SUCCESS;
+}