ndr_string.c

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/* 
   Unix SMB/CIFS implementation.

   routines for marshalling/unmarshalling string types

   Copyright (C) Andrew Tridgell 2003
   
   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/ndr/libndr.h"

/**
  pull a general string from the wire
*/
_PUBLIC_ enum ndr_err_code ndr_pull_string(struct ndr_pull *ndr, int ndr_flags, const char **s)
{
	char *as=NULL;
	uint32_t len1, ofs, len2;
	uint16_t len3;
	int ret;
	charset_t chset = CH_UTF16;
	unsigned byte_mul = 2;
	unsigned flags = ndr->flags;
	unsigned c_len_term = 0;

	if (!(ndr_flags & NDR_SCALARS)) {
		return NDR_ERR_SUCCESS;
	}

	if (NDR_BE(ndr)) {
		chset = CH_UTF16BE;
	}

	if (flags & LIBNDR_FLAG_STR_ASCII) {
		chset = CH_DOS;
		byte_mul = 1;
		flags &= ~LIBNDR_FLAG_STR_ASCII;
	}

	if (flags & LIBNDR_FLAG_STR_UTF8) {
		chset = CH_UTF8;
		byte_mul = 1;
		flags &= ~LIBNDR_FLAG_STR_UTF8;
	}

	flags &= ~LIBNDR_FLAG_STR_CONFORMANT;
	if (flags & LIBNDR_FLAG_STR_CHARLEN) {
		c_len_term = 1;
		flags &= ~LIBNDR_FLAG_STR_CHARLEN;
	}

	switch (flags & LIBNDR_STRING_FLAGS) {
	case LIBNDR_FLAG_STR_LEN4|LIBNDR_FLAG_STR_SIZE4:
	case LIBNDR_FLAG_STR_LEN4|LIBNDR_FLAG_STR_SIZE4|LIBNDR_FLAG_STR_NOTERM:
		NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &len1));
		NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &ofs));
		if (ofs != 0) {
			return ndr_pull_error(ndr, NDR_ERR_STRING, "non-zero array offset with string flags 0x%x\n",
					      ndr->flags & LIBNDR_STRING_FLAGS);
		}
		NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &len2));
		if (len2 > len1) {
			return ndr_pull_error(ndr, NDR_ERR_STRING, 
					      "Bad string lengths len1=%u ofs=%u len2=%u\n", 
					      len1, ofs, len2);
		}
		NDR_PULL_NEED_BYTES(ndr, (len2 + c_len_term)*byte_mul);
		if (len2 == 0) {
			as = talloc_strdup(ndr->current_mem_ctx, "");
		} else {
			ret = convert_string_talloc(ndr->current_mem_ctx,
						    ndr->iconv_convenience, chset, CH_UNIX, 
						    ndr->data+ndr->offset, 
						    (len2 + c_len_term)*byte_mul,
						    (void **)&as);
			if (ret == -1) {
				return ndr_pull_error(ndr, NDR_ERR_CHARCNV, 
						      "Bad character conversion");
			}
		}
		NDR_CHECK(ndr_pull_advance(ndr, (len2 + c_len_term)*byte_mul));

		if (len1 != len2) {
			DEBUG(6,("len1[%u] != len2[%u] '%s'\n", len1, len2, as));
		}

		/* this is a way of detecting if a string is sent with the wrong
		   termination */
		if (ndr->flags & LIBNDR_FLAG_STR_NOTERM) {
			if (strlen(as) < (len2 + c_len_term)) {
				DEBUG(6,("short string '%s'\n", as));
			}
		} else {
			if (strlen(as) == (len2 + c_len_term)) {
				DEBUG(6,("long string '%s'\n", as));
			}
		}
		*s = as;
		break;

	case LIBNDR_FLAG_STR_SIZE4:
	case LIBNDR_FLAG_STR_SIZE4|LIBNDR_FLAG_STR_NOTERM:
		NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &len1));
		NDR_PULL_NEED_BYTES(ndr, (len1 + c_len_term)*byte_mul);
		if (len1 == 0) {
			as = talloc_strdup(ndr->current_mem_ctx, "");
		} else {
			ret = convert_string_talloc(ndr->current_mem_ctx,
						    ndr->iconv_convenience, 
						    chset, CH_UNIX, 
						    ndr->data+ndr->offset, 
						    (len1 + c_len_term)*byte_mul,
						    (void **)&as);
			if (ret == -1) {
				return ndr_pull_error(ndr, NDR_ERR_CHARCNV, 
						      "Bad character conversion");
			}
		}
		NDR_CHECK(ndr_pull_advance(ndr, (len1 + c_len_term)*byte_mul));

		/* this is a way of detecting if a string is sent with the wrong
		   termination */
		if (ndr->flags & LIBNDR_FLAG_STR_NOTERM) {
			if (strlen(as) < (len1 + c_len_term)) {
				DEBUG(6,("short string '%s'\n", as));
			}
		} else {
			if (strlen(as) == (len1 + c_len_term)) {
				DEBUG(6,("long string '%s'\n", as));
			}
		}
		*s = as;
		break;

	case LIBNDR_FLAG_STR_LEN4:
	case LIBNDR_FLAG_STR_LEN4|LIBNDR_FLAG_STR_NOTERM:
		NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &ofs));
		if (ofs != 0) {
			return ndr_pull_error(ndr, NDR_ERR_STRING, "non-zero array offset with string flags 0x%x\n",
					      ndr->flags & LIBNDR_STRING_FLAGS);
		}
		NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &len1));
		NDR_PULL_NEED_BYTES(ndr, (len1 + c_len_term)*byte_mul);
		if (len1 == 0) {
			as = talloc_strdup(ndr->current_mem_ctx, "");
		} else {
			ret = convert_string_talloc(ndr->current_mem_ctx,
						    ndr->iconv_convenience, 
						    chset, CH_UNIX, 
						    ndr->data+ndr->offset, 
						    (len1 + c_len_term)*byte_mul,
						    (void **)&as);
			if (ret == -1) {
				return ndr_pull_error(ndr, NDR_ERR_CHARCNV, 
						      "Bad character conversion");
			}
		}
		NDR_CHECK(ndr_pull_advance(ndr, (len1 + c_len_term)*byte_mul));

		/* this is a way of detecting if a string is sent with the wrong
		   termination */
		if (ndr->flags & LIBNDR_FLAG_STR_NOTERM) {
			if (strlen(as) < (len1 + c_len_term)) {
				DEBUG(6,("short string '%s'\n", as));
			}
		} else {
			if (strlen(as) == (len1 + c_len_term)) {
				DEBUG(6,("long string '%s'\n", as));
			}
		}
		*s = as;
		break;


	case LIBNDR_FLAG_STR_SIZE2:
	case LIBNDR_FLAG_STR_SIZE2|LIBNDR_FLAG_STR_NOTERM:
		NDR_CHECK(ndr_pull_uint16(ndr, NDR_SCALARS, &len3));
		NDR_PULL_NEED_BYTES(ndr, (len3 + c_len_term)*byte_mul);
		if (len3 == 0) {
			as = talloc_strdup(ndr->current_mem_ctx, "");
		} else {
			ret = convert_string_talloc(ndr->current_mem_ctx,
						    ndr->iconv_convenience,
						    chset, CH_UNIX, 
						    ndr->data+ndr->offset, 
						    (len3 + c_len_term)*byte_mul,
						    (void **)&as);
			if (ret == -1) {
				return ndr_pull_error(ndr, NDR_ERR_CHARCNV, 
						      "Bad character conversion");
			}
		}
		NDR_CHECK(ndr_pull_advance(ndr, (len3 + c_len_term)*byte_mul));

		/* this is a way of detecting if a string is sent with the wrong
		   termination */
		if (ndr->flags & LIBNDR_FLAG_STR_NOTERM) {
			if (strlen(as) < (len3 + c_len_term)) {
				DEBUG(6,("short string '%s'\n", as));
			}
		} else {
			if (strlen(as) == (len3 + c_len_term)) {
				DEBUG(6,("long string '%s'\n", as));
			}
		}
		*s = as;
		break;

	case LIBNDR_FLAG_STR_SIZE2|LIBNDR_FLAG_STR_NOTERM|LIBNDR_FLAG_STR_BYTESIZE:
		NDR_CHECK(ndr_pull_uint16(ndr, NDR_SCALARS, &len3));
		NDR_PULL_NEED_BYTES(ndr, len3);
		if (len3 == 0) {
			as = talloc_strdup(ndr->current_mem_ctx, "");
		} else {
			ret = convert_string_talloc(ndr->current_mem_ctx,
						    ndr->iconv_convenience, 
						    chset, CH_UNIX, 
						    ndr->data+ndr->offset, 
						    len3,
						    (void **)&as);
			if (ret == -1) {
				return ndr_pull_error(ndr, NDR_ERR_CHARCNV, 
						      "Bad character conversion");
			}
		}
		NDR_CHECK(ndr_pull_advance(ndr, len3));
		*s = as;
		break;

	case LIBNDR_FLAG_STR_NULLTERM:
		if (byte_mul == 1) {
			len1 = ascii_len_n((const char *)(ndr->data+ndr->offset), ndr->data_size - ndr->offset);
		} else {
			len1 = utf16_len_n(ndr->data+ndr->offset, ndr->data_size - ndr->offset);
		}
		ret = convert_string_talloc(ndr->current_mem_ctx,
					    ndr->iconv_convenience, chset, CH_UNIX, 
					    ndr->data+ndr->offset, 
					    len1,
					    (void **)&as);
		if (ret == -1) {
			return ndr_pull_error(ndr, NDR_ERR_CHARCNV, 
					      "Bad character conversion");
		}
		NDR_CHECK(ndr_pull_advance(ndr, len1));
		*s = as;
		break;

	case LIBNDR_FLAG_STR_NOTERM:
		if (!(ndr->flags & LIBNDR_FLAG_REMAINING)) {
			return ndr_pull_error(ndr, NDR_ERR_STRING, "Bad string flags 0x%x (missing NDR_REMAINING)\n",
					      ndr->flags & LIBNDR_STRING_FLAGS);
		}

		len1 = ndr->data_size - ndr->offset;

		NDR_PULL_NEED_BYTES(ndr, len1);
		if (len1 == 0) {
			as = talloc_strdup(ndr->current_mem_ctx, "");
		} else {
			ret = convert_string_talloc(ndr->current_mem_ctx,
						    ndr->iconv_convenience,
						    chset, CH_UNIX, 
						    ndr->data+ndr->offset, 
						    len1,
						    (void **)&as);
			if (ret == -1) {
				return ndr_pull_error(ndr, NDR_ERR_CHARCNV, 
						      "Bad character conversion");
			}
		}
		NDR_CHECK(ndr_pull_advance(ndr, len1));

		*s = as;
		break;

	default:
		return ndr_pull_error(ndr, NDR_ERR_STRING, "Bad string flags 0x%x\n",
				      ndr->flags & LIBNDR_STRING_FLAGS);
	}

	return NDR_ERR_SUCCESS;
}


/**
  push a general string onto the wire
*/
_PUBLIC_ enum ndr_err_code ndr_push_string(struct ndr_push *ndr, int ndr_flags, const char *s)
{
	ssize_t s_len, c_len, d_len;
	int chset = CH_UTF16;
	unsigned flags = ndr->flags;
	unsigned byte_mul = 2;
	uint8_t *dest = NULL;

	if (!(ndr_flags & NDR_SCALARS)) {
		return NDR_ERR_SUCCESS;
	}

	if (NDR_BE(ndr)) {
		chset = CH_UTF16BE;
	}
	
	s_len = s?strlen(s):0;

	if (flags & LIBNDR_FLAG_STR_ASCII) {
		chset = CH_DOS;
		byte_mul = 1;
		flags &= ~LIBNDR_FLAG_STR_ASCII;
	}

	if (flags & LIBNDR_FLAG_STR_UTF8) {
		chset = CH_UTF8;
		byte_mul = 1;
		flags &= ~LIBNDR_FLAG_STR_UTF8;
	}

	flags &= ~LIBNDR_FLAG_STR_CONFORMANT;

	if (!(flags & LIBNDR_FLAG_STR_NOTERM)) {
		s_len++;
	}
	d_len = convert_string_talloc(ndr, ndr->iconv_convenience, CH_UNIX, chset, s, s_len, (void **)&dest);
	if (d_len == -1) {
		return ndr_push_error(ndr, NDR_ERR_CHARCNV, 
				      "Bad character conversion");
	}

	if (flags & LIBNDR_FLAG_STR_BYTESIZE) {
		c_len = d_len;
		flags &= ~LIBNDR_FLAG_STR_BYTESIZE;
	} else if (flags & LIBNDR_FLAG_STR_CHARLEN) {
		c_len = (d_len / byte_mul)-1;
		flags &= ~LIBNDR_FLAG_STR_CHARLEN;
	} else {
		c_len = d_len / byte_mul;