s4-nbt: move libcli/nbt up one level.

Guenther

1 files changed, 648 insertions, 0 deletions

diff --git a/libcli/nbt/nbtname.c b/libcli/nbt/nbtname.c
new file mode 100644
index 0000000000..338cb21089
--- /dev/null
+++ b/libcli/nbt/nbtname.c
@@ -0,0 +1,648 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   manipulate nbt name structures
+
+   Copyright (C) Andrew Tridgell 2005
+
+   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/>.
+*/
+
+/*
+  see rfc1002 for the detailed format of compressed names
+*/
+
+#include "includes.h"
+#include "librpc/gen_ndr/ndr_nbt.h"
+#include "librpc/gen_ndr/ndr_misc.h"
+#include "system/locale.h"
+
+/* don't allow an unlimited number of name components */
+#define MAX_COMPONENTS 10
+
+/**
+  print a nbt string
+*/
+_PUBLIC_ void ndr_print_nbt_string(struct ndr_print *ndr, const char *name, const char *s)
+{
+	ndr_print_string(ndr, name, s);
+}
+
+/*
+  pull one component of a nbt_string
+*/
+static enum ndr_err_code ndr_pull_component(struct ndr_pull *ndr,
+					    uint8_t **component,
+					    uint32_t *offset,
+					    uint32_t *max_offset)
+{
+	uint8_t len;
+	uint_t loops = 0;
+	while (loops < 5) {
+		if (*offset >= ndr->data_size) {
+			return ndr_pull_error(ndr, NDR_ERR_STRING,
+					      "BAD NBT NAME component");
+		}
+		len = ndr->data[*offset];
+		if (len == 0) {
+			*offset += 1;
+			*max_offset = MAX(*max_offset, *offset);
+			*component = NULL;
+			return NDR_ERR_SUCCESS;
+		}
+		if ((len & 0xC0) == 0xC0) {
+			/* its a label pointer */
+			if (1 + *offset >= ndr->data_size) {
+				return ndr_pull_error(ndr, NDR_ERR_STRING,
+						      "BAD NBT NAME component");
+			}
+			*max_offset = MAX(*max_offset, *offset + 2);
+			*offset = ((len&0x3F)<<8) | ndr->data[1 + *offset];
+			*max_offset = MAX(*max_offset, *offset);
+			loops++;
+			continue;
+		}
+		if ((len & 0xC0) != 0) {
+			/* its a reserved length field */
+			return ndr_pull_error(ndr, NDR_ERR_STRING,
+					      "BAD NBT NAME component");
+		}
+		if (*offset + len + 2 > ndr->data_size) {
+			return ndr_pull_error(ndr, NDR_ERR_STRING,
+					      "BAD NBT NAME component");
+		}
+		*component = (uint8_t*)talloc_strndup(ndr, (const char *)&ndr->data[1 + *offset], len);
+		NDR_ERR_HAVE_NO_MEMORY(*component);
+		*offset += len + 1;
+		*max_offset = MAX(*max_offset, *offset);
+		return NDR_ERR_SUCCESS;
+	}
+
+	/* too many pointers */
+	return ndr_pull_error(ndr, NDR_ERR_STRING, "BAD NBT NAME component");
+}
+
+/**
+  pull a nbt_string from the wire
+*/
+_PUBLIC_ enum ndr_err_code ndr_pull_nbt_string(struct ndr_pull *ndr, int ndr_flags, const char **s)
+{
+	uint32_t offset = ndr->offset;
+	uint32_t max_offset = offset;
+	unsigned num_components;
+	char *name;
+
+	if (!(ndr_flags & NDR_SCALARS)) {
+		return NDR_ERR_SUCCESS;
+	}
+
+	name = NULL;
+
+	/* break up name into a list of components */
+	for (num_components=0;num_components<MAX_COMPONENTS;num_components++) {
+		uint8_t *component = NULL;
+		NDR_CHECK(ndr_pull_component(ndr, &component, &offset, &max_offset));
+		if (component == NULL) break;
+		if (name) {
+			name = talloc_asprintf_append_buffer(name, ".%s", component);
+			NDR_ERR_HAVE_NO_MEMORY(name);
+		} else {
+			name = (char *)component;
+		}
+	}
+	if (num_components == MAX_COMPONENTS) {
+		return ndr_pull_error(ndr, NDR_ERR_STRING,
+				      "BAD NBT NAME too many components");
+	}
+	if (num_components == 0) {
+		name = talloc_strdup(ndr, "");
+		NDR_ERR_HAVE_NO_MEMORY(name);
+	}
+
+	(*s) = name;
+	ndr->offset = max_offset;
+
+	return NDR_ERR_SUCCESS;
+}
+
+/**
+  push a nbt string to the wire
+*/
+_PUBLIC_ enum ndr_err_code ndr_push_nbt_string(struct ndr_push *ndr, int ndr_flags, const char *s)
+{
+	if (!(ndr_flags & NDR_SCALARS)) {
+		return NDR_ERR_SUCCESS;
+	}
+
+	while (s && *s) {
+		enum ndr_err_code ndr_err;
+		char *compname;
+		size_t complen;
+		uint32_t offset;
+
+		/* see if we have pushed the remaing string allready,
+		 * if so we use a label pointer to this string
+		 */
+		ndr_err = ndr_token_retrieve_cmp_fn(&ndr->nbt_string_list, s, &offset, (comparison_fn_t)strcmp, false);
+		if (NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+			uint8_t b[2];
+
+			if (offset > 0x3FFF) {
+				return ndr_push_error(ndr, NDR_ERR_STRING,
+						      "offset for nbt string label pointer %u[%08X] > 0x00003FFF",
+						      offset, offset);
+			}
+
+			b[0] = 0xC0 | (offset>>8);
+			b[1] = (offset & 0xFF);
+
+			return ndr_push_bytes(ndr, b, 2);
+		}
+
+		complen = strcspn(s, ".");
+
+		/* we need to make sure the length fits into 6 bytes */
+		if (complen >= 0x3F) {
+			return ndr_push_error(ndr, NDR_ERR_STRING,
+					      "component length %u[%08X] > 0x00003F",
+					      (unsigned)complen, (unsigned)complen);
+		}
+
+		compname = talloc_asprintf(ndr, "%c%*.*s",
+						(unsigned char)complen,
+						(unsigned char)complen,
+						(unsigned char)complen, s);
+		NDR_ERR_HAVE_NO_MEMORY(compname);
+
+		/* remember the current componemt + the rest of the string
+		 * so it can be reused later
+		 */
+		NDR_CHECK(ndr_token_store(ndr, &ndr->nbt_string_list, s, ndr->offset));
+
+		/* push just this component into the blob */
+		NDR_CHECK(ndr_push_bytes(ndr, (const uint8_t *)compname, complen+1));
+		talloc_free(compname);
+
+		s += complen;
+		if (*s == '.') s++;
+	}
+
+	/* if we reach the end of the string and have pushed the last component
+	 * without using a label pointer, we need to terminate the string
+	 */
+	return ndr_push_bytes(ndr, (const uint8_t *)"", 1);
+}
+
+
+/*
+  decompress a 'compressed' name component
+ */
+static bool decompress_name(char *name, enum nbt_name_type *type)
+{
+	int i;
+	for (i=0;name[2*i];i++) {
+		uint8_t c1 = name[2*i];
+		uint8_t c2 = name[1+(2*i)];
+		if (c1 < 'A' || c1 > 'P' ||
+		    c2 < 'A' || c2 > 'P') {
+			return false;
+		}
+		name[i] = ((c1-'A')<<4) | (c2-'A');
+	}
+	name[i] = 0;
+	if (i == 16) {
+		*type = (enum nbt_name_type)(name[15]);
+		name[15] = 0;
+		i--;
+	} else {
+		*type = NBT_NAME_CLIENT;
+	}
+
+	/* trim trailing spaces */
+	for (;i>0 && name[i-1]==' ';i--) {
+		name[i-1] = 0;
+	}
+
+	return true;
+}
+
+
+/*
+  compress a name component
+ */
+static uint8_t *compress_name(TALLOC_CTX *mem_ctx,
+			      const uint8_t *name, enum nbt_name_type type)
+{
+	uint8_t *cname;
+	int i;
+	uint8_t pad_char;
+
+	if (strlen((const char *)name) > 15) {
+		return NULL;
+	}
+
+	cname = talloc_array(mem_ctx, uint8_t, 33);
+	if (cname == NULL) return NULL;
+
+	for (i=0;name[i];i++) {
+		cname[2*i]   = 'A' + (name[i]>>4);
+		cname[1+2*i] = 'A' + (name[i]&0xF);
+	}
+	if (strcmp((const char *)name, "*") == 0) {
+		pad_char = 0;
+	} else {
+		pad_char = ' ';
+	}
+	for (;i<15;i++) {
+		cname[2*i]   = 'A' + (pad_char>>4);
+		cname[1+2*i] = 'A' + (pad_char&0xF);
+	}
+
+	pad_char = type;
+	cname[2*i]   = 'A' + (pad_char>>4);
+	cname[1+2*i] = 'A' + (pad_char&0xF);
+
+	cname[32] = 0;
+	return cname;
+}
+
+
+/**
+  pull a nbt name from the wire
+*/
+_PUBLIC_ enum ndr_err_code ndr_pull_nbt_name(struct ndr_pull *ndr, int ndr_flags, struct nbt_name *r)
+{
+	uint8_t *scope;
+	char *cname;
+	const char *s;
+	bool ok;
+
+	if (!(ndr_flags & NDR_SCALARS)) {
+		return NDR_ERR_SUCCESS;
+	}
+
+	NDR_CHECK(ndr_pull_nbt_string(ndr, ndr_flags, &s));
+
+	scope = (uint8_t *)strchr(s, '.');
+	if (scope) {
+		*scope = 0;
+		r->scope = talloc_strdup(ndr->current_mem_ctx, (const char *)&scope[1]);
+		NDR_ERR_HAVE_NO_MEMORY(r->scope);
+	} else {
+		r->scope = NULL;
+	}
+
+	cname = discard_const_p(char, s);
+
+	/* the first component is limited to 16 bytes in the DOS charset,
+	   which is 32 in the 'compressed' form */
+	if (strlen(cname) > 32) {
+		return ndr_pull_error(ndr, NDR_ERR_STRING,
+				      "NBT NAME cname > 32");
+	}
+
+	/* decompress the first component */
+	ok = decompress_name(cname, &r->type);
+	if (!ok) {
+		return ndr_pull_error(ndr, NDR_ERR_STRING,
+				      "NBT NAME failed to decompress");
+	}
+
+	r->name = talloc_strdup(ndr->current_mem_ctx, cname);
+	NDR_ERR_HAVE_NO_MEMORY(r->name);
+
+	talloc_free(cname);
+
+	return NDR_ERR_SUCCESS;
+}
+
+/**
+  push a nbt name to the wire
+*/
+_PUBLIC_ enum ndr_err_code ndr_push_nbt_name(struct ndr_push *ndr, int ndr_flags, const struct nbt_name *r)
+{
+	uint8_t *cname, *fullname;
+	enum ndr_err_code ndr_err;
+
+	if (!(ndr_flags & NDR_SCALARS)) {
+		return NDR_ERR_SUCCESS;
+	}
+
+	if (strlen(r->name) > 15) {
+		return ndr_push_error(ndr, NDR_ERR_STRING,
+				      "nbt_name longer as 15 chars: %s",
+				      r->name);
+	}
+
+	cname = compress_name(ndr, (const uint8_t *)r->name, r->type);
+	NDR_ERR_HAVE_NO_MEMORY(cname);
+
+	if (r->scope) {
+		fullname = (uint8_t *)talloc_asprintf(ndr, "%s.%s", cname, r->scope);
+		NDR_ERR_HAVE_NO_MEMORY(fullname);
+		talloc_free(cname);
+	} else {
+		fullname = cname;
+	}
+
+	ndr_err = ndr_push_nbt_string(ndr, ndr_flags, (const char *)fullname);
+
+	return ndr_err;
+}
+
+
+/**
+  copy a nbt name structure
+*/
+_PUBLIC_ NTSTATUS nbt_name_dup(TALLOC_CTX *mem_ctx, struct nbt_name *name, struct nbt_name *newname)
+{
+	*newname = *name;
+	newname->name = talloc_strdup(mem_ctx, newname->name);
+	NT_STATUS_HAVE_NO_MEMORY(newname->name);
+	newname->scope = talloc_strdup(mem_ctx, newname->scope);
+	if (name->scope) {
+		NT_STATUS_HAVE_NO_MEMORY(newname->scope);
+	}
+	return NT_STATUS_OK;
+}
+
+/**
+  push a nbt name into a blob
+*/
+_PUBLIC_ NTSTATUS nbt_name_to_blob(TALLOC_CTX *mem_ctx, struct smb_iconv_convenience *iconv_convenience, DATA_BLOB *blob, struct nbt_name *name)
+{
+	enum ndr_err_code ndr_err;
+
+	ndr_err = ndr_push_struct_blob(blob, mem_ctx, iconv_convenience, name, (ndr_push_flags_fn_t)ndr_push_nbt_name);
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+		return ndr_map_error2ntstatus(ndr_err);
+	}
+
+	return NT_STATUS_OK;
+}
+
+/**
+  pull a nbt name from a blob
+*/
+_PUBLIC_ NTSTATUS nbt_name_from_blob(TALLOC_CTX *mem_ctx, const DATA_BLOB *blob, struct nbt_name *name)
+{
+	enum ndr_err_code ndr_err;
+
+	ndr_err = ndr_pull_struct_blob(blob, mem_ctx, NULL, name,
+				       (ndr_pull_flags_fn_t)ndr_pull_nbt_name);
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+		return ndr_map_error2ntstatus(ndr_err);
+	}
+
+	return NT_STATUS_OK;
+}
+
+
+/**
+  choose a name to use when calling a server in a NBT session request.
+  we use heuristics to see if the name we have been given is a IP
+  address, or a too-long name. If it is then use *SMBSERVER, or a
+  truncated name
+*/
+_PUBLIC_ void nbt_choose_called_name(TALLOC_CTX *mem_ctx,
+			    struct nbt_name *n, const char *name, int type)
+{
+	n->scope = NULL;
+	n->type = type;
+
+	if ((name == NULL) || is_ipaddress(name)) {
+		n->name = "*SMBSERVER";
+		return;
+	}
+	if (strlen(name) > 15) {
+		const char *p = strchr(name, '.');
+		char *s;
+		if (p - name > 15) {
+			n->name = "*SMBSERVER";
+			return;
+		}
+		s = talloc_strndup(mem_ctx, name, PTR_DIFF(p, name));
+		n->name = talloc_strdup_upper(mem_ctx, s);
+		return;
+	}
+
+	n->name = talloc_strdup_upper(mem_ctx, name);
+}
+
+
+/*
+  escape a string into a form containing only a small set of characters,
+  the rest is hex encoded. This is similar to URL encoding
+*/
+static const char *nbt_hex_encode(TALLOC_CTX *mem_ctx, const char *s)
+{
+	int i, len;
+	char *ret;
+	const char *valid_chars = "_-.$@ ";
+#define NBT_CHAR_ALLOW(c) (isalnum((unsigned char)c) || strchr(valid_chars, c))
+
+	for (len=i=0;s[i];i++,len++) {
+		if (!NBT_CHAR_ALLOW(s[i])) {
+			len += 2;
+		}
+	}
+
+	ret = talloc_array(mem_ctx, char, len+1);
+	if (ret == NULL) return NULL;
+
+	for (len=i=0;s[i];i++) {
+		if (NBT_CHAR_ALLOW(s[i])) {
+			ret[len++] = s[i];
+		} else {
+			snprintf(&ret[len], 4, "%%%02x", (unsigned char)s[i]);
+			len += 3;
+		}
+	}
+	ret[len] = 0;
+
+	return ret;
+}
+
+
+/**
+  form a string for a NBT name
+*/
+_PUBLIC_ char *nbt_name_string(TALLOC_CTX *mem_ctx, const struct nbt_name *name)
+{
+	TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
+	char *ret;
+	if (name->scope) {
+		ret = talloc_asprintf(mem_ctx, "%s<%02x>-%s",
+				      nbt_hex_encode(tmp_ctx, name->name),
+				      name->type,
+				      nbt_hex_encode(tmp_ctx, name->scope));
+	} else {
+		ret = talloc_asprintf(mem_ctx, "%s<%02x>",
+				      nbt_hex_encode(tmp_ctx, name->name),
+				      name->type);
+	}
+	talloc_free(tmp_ctx);
+	return ret;
+}
+
+/**
+  pull a nbt name, WINS Replication uses another on wire format for nbt name
+*/
+_PUBLIC_ enum ndr_err_code ndr_pull_wrepl_nbt_name(struct ndr_pull *ndr, int ndr_flags, const struct nbt_name **_r)
+{
+	struct nbt_name *r;
+	uint8_t *namebuf;
+	uint32_t namebuf_len;
+
+	if (!(ndr_flags & NDR_SCALARS)) {
+		return NDR_ERR_SUCCESS;
+	}
+
+	NDR_CHECK(ndr_pull_align(ndr, 4));
+	NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &namebuf_len));
+	if (namebuf_len < 1 || namebuf_len > 255) {
+		return ndr_pull_error(ndr, NDR_ERR_ALLOC, "value out of range");
+	}
+	NDR_PULL_ALLOC_N(ndr, namebuf, namebuf_len);
+	NDR_CHECK(ndr_pull_array_uint8(ndr, NDR_SCALARS, namebuf, namebuf_len));
+
+	NDR_PULL_ALLOC(ndr, r);
+
+	/* oh wow, what a nasty bug in windows ... */
+	if (namebuf[0] == 0x1b && namebuf_len >= 16) {
+		namebuf[0] = namebuf[15];
+		namebuf[15] = 0x1b;
+	}
+
+	if (namebuf_len < 17) {
+		r->type	= 0x00;
+
+		r->name	= talloc_strndup(r, (char *)namebuf, namebuf_len);
+		if (!r->name) return ndr_pull_error(ndr, NDR_ERR_ALLOC, "out of memory");
+
+		r->scope= NULL;
+
+		talloc_free(namebuf);
+		*_r = r;
+		return NDR_ERR_SUCCESS;
+	}
+
+	r->type = namebuf[15];
+
+	namebuf[15] = '\0';
+	trim_string((char *)namebuf, NULL, " ");
+	r->name = talloc_strdup(r, (char *)namebuf);
+	if (!r->name) return ndr_pull_error(ndr, NDR_ERR_ALLOC, "out of memory");
+
+	if (namebuf_len > 18) {
+		r->scope = talloc_strndup(r, (char *)(namebuf+17), namebuf_len-17);
+		if (!r->scope) return ndr_pull_error(ndr, NDR_ERR_ALLOC, "out of memory");
+	} else {
+		r->scope = NULL;
+	}
+
+	talloc_free(namebuf);
+	*_r = r;
+	return NDR_ERR_SUCCESS;
+}
+
+/**
+  push a nbt name, WINS Replication uses another on wire format for nbt name
+*/
+_PUBLIC_ enum ndr_err_code ndr_push_wrepl_nbt_name(struct ndr_push *ndr, int ndr_flags, const struct nbt_name *r)
+{
+	uint8_t *namebuf;
+	uint32_t namebuf_len;
+	uint32_t _name_len;
+	uint32_t scope_len = 0;
+
+	if (r == NULL) {
+		return ndr_push_error(ndr, NDR_ERR_INVALID_POINTER,
+				      "wrepl_nbt_name NULL pointer");
+	}
+
+	if (!(ndr_flags & NDR_SCALARS)) {
+		return NDR_ERR_SUCCESS;
+	}
+
+	_name_len = strlen(r->name);
+	if (_name_len > 15) {
+		return ndr_push_error(ndr, NDR_ERR_STRING,
+				      "wrepl_nbt_name longer as 15 chars: %s",
+				      r->name);
+	}
+
+	if (r->scope) {
+		scope_len = strlen(r->scope);
+	}
+	if (scope_len > 238) {
+		return ndr_push_error(ndr, NDR_ERR_STRING,
+				      "wrepl_nbt_name scope longer as 238 chars: %s",
+				      r->scope);
+	}
+
+	namebuf = (uint8_t *)talloc_asprintf(ndr, "%-15s%c%s",
+					     r->name, 'X',
+					     (r->scope?r->scope:""));
+	if (!namebuf) return ndr_push_error(ndr, NDR_ERR_ALLOC, "out of memory");
+
+	namebuf_len = strlen((char *)namebuf) + 1;
+
+	/*
+	 * we need to set the type here, and use a place-holder in the talloc_asprintf()
+	 * as the type can be 0x00, and then the namebuf_len = strlen(namebuf); would give wrong results
+	 */
+	namebuf[15] = r->type;
+
+	/* oh wow, what a nasty bug in windows ... */
+	if (r->type == 0x1b) {
+		namebuf[15] = namebuf[0];
+		namebuf[0] = 0x1b;
+	}
+
+	NDR_CHECK(ndr_push_align(ndr, 4));
+	NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, namebuf_len));
+	NDR_CHECK(ndr_push_array_uint8(ndr, NDR_SCALARS, namebuf, namebuf_len));
+
+	talloc_free(namebuf);
+	return NDR_ERR_SUCCESS;
+}
+
+_PUBLIC_ void ndr_print_wrepl_nbt_name(struct ndr_print *ndr, const char *name, const struct nbt_name *r)
+{
+	char *s = nbt_name_string(ndr, r);
+	ndr_print_string(ndr, name, s);
+	talloc_free(s);
+}
+
+_PUBLIC_ enum ndr_err_code ndr_push_nbt_res_rec(struct ndr_push *ndr, int ndr_flags, const struct nbt_res_rec *r)
+{
+	{
+		uint32_t _flags_save_STRUCT = ndr->flags;
+		ndr_set_flags(&ndr->flags, LIBNDR_PRINT_ARRAY_HEX);
+		if (ndr_flags & NDR_SCALARS) {
+			NDR_CHECK(ndr_push_align(ndr, 4));
+			NDR_CHECK(ndr_push_nbt_name(ndr, NDR_SCALARS, &r->name));
+			NDR_CHECK(ndr_push_nbt_qtype(ndr, NDR_SCALARS, r->rr_type));
+			NDR_CHECK(ndr_push_nbt_qclass(ndr, NDR_SCALARS, r->rr_class));
+			NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, r->ttl));
+			NDR_CHECK(ndr_push_set_switch_value(ndr, &r->rdata, ((((r->rr_type) == NBT_QTYPE_NETBIOS) && ((r->rdata).data.length == 2))?0:r->rr_type)));
+			NDR_CHECK(ndr_push_nbt_rdata(ndr, NDR_SCALARS, &r->rdata));
+		}
+		if (ndr_flags & NDR_BUFFERS) {
+		}
+		ndr->flags = _flags_save_STRUCT;
+	}
+	return NDR_ERR_SUCCESS;
+}