/* Unix SMB/CIFS implementation. parsing of EA (extended attribute) lists 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 2 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, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include "includes.h" /* work out how many bytes on the wire a ea list will consume. This assumes the names are strict ascii, which should be a reasonable assumption */ uint_t ea_list_size(uint_t num_eas, struct ea_struct *eas) { uint_t total = 4; int i; for (i=0;i<num_eas;i++) { total += 4 + strlen(eas[i].name.s)+1 + eas[i].value.length; } return total; } /* put a ea_list into a pre-allocated buffer - buffer must be at least of size ea_list_size() */ void ea_put_list(char *data, uint_t num_eas, struct ea_struct *eas) { int i; uint32 ea_size; ea_size = ea_list_size(num_eas, eas); SIVAL(data, 0, ea_size); data += 4; for (i=0;i<num_eas;i++) { uint_t nlen = strlen(eas[i].name.s); SCVAL(data, 0, eas[i].flags); SCVAL(data, 1, nlen); SSVAL(data, 2, eas[i].value.length); memcpy(data+4, eas[i].name.s, nlen+1); memcpy(data+4+nlen+1, eas[i].value.data, eas[i].value.length); data += 4+nlen+1+eas[i].value.length; } } /* pull a ea_struct from a buffer. Return the number of bytes consumed */ uint_t ea_pull_struct(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx, struct ea_struct *ea) { uint8 nlen; uint16 vlen; if (blob->length < 6) { return 0; } ea->flags = CVAL(blob->data, 0); nlen = CVAL(blob->data, 1); vlen = SVAL(blob->data, 2); if (nlen+1+vlen > blob->length-4) { return 0; } ea->name.s = talloc_strndup(mem_ctx, blob->data+4, nlen); ea->name.private_length = nlen; ea->value = data_blob_talloc(mem_ctx, NULL, vlen+1); if (!ea->value.data) return 0; if (vlen) { memcpy(ea->value.data, blob->data+4+nlen+1, vlen); } ea->value.data[vlen] = 0; ea->value.length--; return 4 + nlen+1 + vlen; } /* pull a ea_list from a buffer */ NTSTATUS ea_pull_list(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx, uint_t *num_eas, struct ea_struct **eas) { int n; uint32 ea_size, ofs; if (blob->length < 4) { return NT_STATUS_INFO_LENGTH_MISMATCH; } ea_size = IVAL(blob->data, 0); if (ea_size > blob->length) { return NT_STATUS_INVALID_PARAMETER; } ofs = 4; n = 0; *num_eas = 0; *eas = NULL; while (ofs < ea_size) { uint_t len; DATA_BLOB blob2; blob2.data = blob->data + ofs; blob2.length = ea_size - ofs; *eas = talloc_realloc(mem_ctx, *eas, sizeof(**eas) * (n+1)); if (! *eas) return NT_STATUS_NO_MEMORY; len = ea_pull_struct(&blob2, mem_ctx, &(*eas)[n]); if (len == 0) { return NT_STATUS_INVALID_PARAMETER; } ofs += len; n++; } *num_eas = n; return NT_STATUS_OK; }