ldb_ldif.c

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/* 
   ldb database library

   Copyright (C) Andrew Tridgell  2004

     ** NOTE! The following LGPL license applies to the ldb
     ** library. This does NOT imply that all of Samba is released
     ** under the LGPL
   
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 3 of the License, or (at your option) any later version.

   This library 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/

/*
 *  Name: ldb
 *
 *  Component: ldif routines
 *
 *  Description: ldif pack/unpack routines
 *
 *  Author: Andrew Tridgell
 */

/*
  see RFC2849 for the LDIF format definition
*/

#include "ldb_includes.h"
#include "system/locale.h"

/*
  
*/
static int ldb_read_data_file(void *mem_ctx, struct ldb_val *value)
{
	struct stat statbuf;
	char *buf;
	int count, size, bytes;
	int ret;
	int f;
	const char *fname = (const char *)value->data;

	if (strncmp(fname, "file://", 7) != 0) {
		return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
	}
	fname += 7;

	f = open(fname, O_RDONLY);
	if (f == -1) {
		return -1;
	}

	if (fstat(f, &statbuf) != 0) {
		ret = -1;
		goto done;
	}

	if (statbuf.st_size == 0) {
		ret = -1;
		goto done;
	}

	value->data = (uint8_t *)talloc_size(mem_ctx, statbuf.st_size + 1);
	if (value->data == NULL) {
		ret = -1;
		goto done;
	}
	value->data[statbuf.st_size] = 0;

	count = 0;
	size = statbuf.st_size;
	buf = (char *)value->data;
	while (count < statbuf.st_size) {
		bytes = read(f, buf, size);
		if (bytes == -1) {
			talloc_free(value->data);
			ret = -1;
			goto done;
		}
		count += bytes;
		buf += bytes;
		size -= bytes;
	}

	value->length = statbuf.st_size;
	ret = statbuf.st_size;

done:
	close(f);
	return ret;
}

/*
  this base64 decoder was taken from jitterbug (written by tridge).
  we might need to replace it with a new version
*/
int ldb_base64_decode(char *s)
{
	const char *b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
	int bit_offset=0, byte_offset, idx, i, n;
	uint8_t *d = (uint8_t *)s;
	char *p=NULL;

	n=i=0;

	while (*s && (p=strchr(b64,*s))) {
		idx = (int)(p - b64);
		byte_offset = (i*6)/8;
		bit_offset = (i*6)%8;
		d[byte_offset] &= ~((1<<(8-bit_offset))-1);
		if (bit_offset < 3) {
			d[byte_offset] |= (idx << (2-bit_offset));
			n = byte_offset+1;
		} else {
			d[byte_offset] |= (idx >> (bit_offset-2));
			d[byte_offset+1] = 0;
			d[byte_offset+1] |= (idx << (8-(bit_offset-2))) & 0xFF;
			n = byte_offset+2;
		}
		s++; i++;
	}
	if (bit_offset >= 3) {
		n--;
	}

	if (*s && !p) {
		/* the only termination allowed */
		if (*s != '=') {
			return -1;
		}
	}

	/* null terminate */
	d[n] = 0;
	return n;
}


/*
  encode as base64
  caller frees
*/
char *ldb_base64_encode(void *mem_ctx, const char *buf, int len)
{
	const char *b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
	int bit_offset, byte_offset, idx, i;
	const uint8_t *d = (const uint8_t *)buf;
	int bytes = (len*8 + 5)/6, pad_bytes = (bytes % 4) ? 4 - (bytes % 4) : 0;
	char *out;

	out = talloc_array(mem_ctx, char, bytes+pad_bytes+1);
	if (!out) return NULL;

	for (i=0;i<bytes;i++) {
		byte_offset = (i*6)/8;
		bit_offset = (i*6)%8;
		if (bit_offset < 3) {
			idx = (d[byte_offset] >> (2-bit_offset)) & 0x3F;
		} else {
			idx = (d[byte_offset] << (bit_offset-2)) & 0x3F;
			if (byte_offset+1 < len) {
				idx |= (d[byte_offset+1] >> (8-(bit_offset-2)));
			}
		}
		out[i] = b64[idx];
	}

	for (;i<bytes+pad_bytes;i++)
		out[i] = '=';
	out[i] = 0;

	return out;
}

/*
  see if a buffer should be base64 encoded
*/
int ldb_should_b64_encode(const struct ldb_val *val)
{
	unsigned int i;
	uint8_t *p = val->data;

	if (val->length == 0) {
		return 0;
	}

	if (p[0] == ' ' || p[0] == ':') {
		return 1;
	}

	for (i=0; i<val->length; i++) {
		if (!isprint(p[i]) || p[i] == '\n') {
			return 1;
		}
	}
	return 0;
}

/* this macro is used to handle the return checking on fprintf_fn() */
#define CHECK_RET do { if (ret < 0) return ret; total += ret; } while (0)

/*
  write a line folded string onto a file
*/
static int fold_string(int (*fprintf_fn)(void *, const char *, ...), void *private_data,
			const char *buf, size_t length, int start_pos)
{
	unsigned int i;
	int total=0, ret;

	for (i=0;i<length;i++) {
		ret = fprintf_fn(private_data, "%c", buf[i]);
		CHECK_RET;
		if (i != (length-1) && (i + start_pos) % 77 == 0) {
			ret = fprintf_fn(private_data, "\n ");
			CHECK_RET;
		}
	}

	return total;
}

#undef CHECK_RET

/*
  encode as base64 to a file
*/
static int base64_encode_f(struct ldb_context *ldb,
			   int (*fprintf_fn)(void *, const char *, ...), 
			   void *private_data,
			   const char *buf, int len, int start_pos)
{
	char *b = ldb_base64_encode(ldb, buf, len);
	int ret;

	if (!b) {
		return -1;
	}

	ret = fold_string(fprintf_fn, private_data, b, strlen(b), start_pos);

	talloc_free(b);
	return ret;
}


static const struct {
	const char *name;
	enum ldb_changetype changetype;
} ldb_changetypes[] = {
	{"add",    LDB_CHANGETYPE_ADD},
	{"delete", LDB_CHANGETYPE_DELETE},
	{"modify", LDB_CHANGETYPE_MODIFY},
	{NULL, 0}
};

/* this macro is used to handle the return checking on fprintf_fn() */
#define CHECK_RET do { if (ret < 0) { talloc_free(mem_ctx); return ret; } total += ret; } while (0)

/*
  write to ldif, using a caller supplied write method
*/
int ldb_ldif_write(struct ldb_context *ldb,
		   int (*fprintf_fn)(void *, const char *, ...), 
		   void *private_data,
		   const struct ldb_ldif *ldif)
{
	TALLOC_CTX *mem_ctx;
	unsigned int i, j;
	int total=0, ret;
	const struct ldb_message *msg;

	mem_ctx = talloc_named_const(NULL, 0, "ldb_ldif_write");

	msg = ldif->msg;

	ret = fprintf_fn(private_data, "dn: %s\n", ldb_dn_get_linearized(msg->dn));
	CHECK_RET;

	if (ldif->changetype != LDB_CHANGETYPE_NONE) {
		for (i=0;ldb_changetypes[i].name;i++) {
			if (ldb_changetypes[i].changetype == ldif->changetype) {
				break;
			}
		}
		if (!ldb_changetypes[i].name) {
			ldb_debug(ldb, LDB_DEBUG_ERROR, "Error: Invalid ldif changetype %d\n",
				  ldif->changetype);
			talloc_free(mem_ctx);
			return -1;
		}
		ret = fprintf_fn(private_data, "changetype: %s\n", ldb_changetypes[i].name);
		CHECK_RET;
	}

	for (i=0;i<msg->num_elements;i++) {
		const struct ldb_schema_attribute *a;

		a = ldb_schema_attribute_by_name(ldb, msg->elements[i].name);

		if (ldif->changetype == LDB_CHANGETYPE_MODIFY) {
			switch (msg->elements[i].flags & LDB_FLAG_MOD_MASK) {
			case LDB_FLAG_MOD_ADD:
				fprintf_fn(private_data, "add: %s\n", 
					   msg->elements[i].name);
				break;
			case LDB_FLAG_MOD_DELETE:
				fprintf_fn(private_data, "delete: %s\n", 
					   msg->elements[i].name);
				break;
			case LDB_FLAG_MOD_REPLACE:
				fprintf_fn(private_data, "replace: %s\n", 
					   msg->elements[i].name);
				break;
			}
		}

		for (j=0;j<msg->elements[i].num_values;j++) {
			struct ldb_val v;
			ret = a->syntax->ldif_write_fn(ldb, mem_ctx, &msg->elements[i].values[j], &v);
			CHECK_RET;
			if (ldb_should_b64_encode(&v)) {
				ret = fprintf_fn(private_data, "%s:: ", 
						 msg->elements[i].name);
				CHECK_RET;
				ret = base64_encode_f(ldb, fprintf_fn, private_data, 
						      (char *)v.data, v.length,
						      strlen(msg->elements[i].name)+3);
				CHECK_RET;
				ret = fprintf_fn(private_data, "\n");
				CHECK_RET;
			} else {
				ret = fprintf_fn(private_data, "%s: ", msg->elements[i].name);
				CHECK_RET;
				ret = fold_string(fprintf_fn, private_data,
						  (char *)v.data, v.length,
						  strlen(msg->elements[i].name)+2);
				CHECK_RET;
				ret = fprintf_fn(private_data, "\n");
				CHECK_RET;
			}
			if (v.data != msg->elements[i].values[j].data) {
				talloc_free(v.data);
			}
		}
		if (ldif->changetype == LDB_CHANGETYPE_MODIFY) {
			fprintf_fn(private_data, "-\n");
		}
	}
	ret = fprintf_fn(private_data,"\n");
	CHECK_RET;

	return total;
}

#undef CHECK_RET


/*
  pull a ldif chunk, which is defined as a piece of data ending in \n\n or EOF
  this routine removes any RFC2849 continuations and comments

  caller frees
*/
static char *next_chunk(struct ldb_context *ldb, 
			int (*fgetc_fn)(void *), void *private_data)
{
	size_t alloc_size=0, chunk_size = 0;
	char *chunk = NULL;