diff options
Diffstat (limited to 'source3/lib')
| -rw-r--r-- | source3/lib/util_ea.c | 126 | ||||
| -rw-r--r-- | source3/lib/util_ea.h | 36 |
2 files changed, 162 insertions, 0 deletions
diff --git a/source3/lib/util_ea.c b/source3/lib/util_ea.c new file mode 100644 index 0000000000..81684da4cb --- /dev/null +++ b/source3/lib/util_ea.c @@ -0,0 +1,126 @@ +/* + Unix SMB/CIFS implementation. + SMB Extended attribute buffer handling + Copyright (C) Jeremy Allison 2005-2013 + Copyright (C) Tim Prouty 2008 + + 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 "lib/util_ea.h" + +/**************************************************************************** + Read one EA list entry from the buffer. +****************************************************************************/ + +struct ea_list *read_ea_list_entry(TALLOC_CTX *ctx, const char *pdata, size_t data_size, size_t *pbytes_used) +{ + struct ea_list *eal = talloc_zero(ctx, struct ea_list); + uint16 val_len; + unsigned int namelen; + size_t converted_size; + + if (!eal) { + return NULL; + } + + if (data_size < 6) { + return NULL; + } + + eal->ea.flags = CVAL(pdata,0); + namelen = CVAL(pdata,1); + val_len = SVAL(pdata,2); + + if (4 + namelen + 1 + val_len > data_size) { + return NULL; + } + + /* Ensure the name is null terminated. */ + if (pdata[namelen + 4] != '\0') { + return NULL; + } + if (!pull_ascii_talloc(ctx, &eal->ea.name, pdata + 4, &converted_size)) { + DEBUG(0,("read_ea_list_entry: pull_ascii_talloc failed: %s", + strerror(errno))); + } + if (!eal->ea.name) { + return NULL; + } + + eal->ea.value = data_blob_talloc(eal, NULL, (size_t)val_len + 1); + if (!eal->ea.value.data) { + return NULL; + } + + memcpy(eal->ea.value.data, pdata + 4 + namelen + 1, val_len); + + /* Ensure we're null terminated just in case we print the value. */ + eal->ea.value.data[val_len] = '\0'; + /* But don't count the null. */ + eal->ea.value.length--; + + if (pbytes_used) { + *pbytes_used = 4 + namelen + 1 + val_len; + } + + DEBUG(10,("read_ea_list_entry: read ea name %s\n", eal->ea.name)); + dump_data(10, eal->ea.value.data, eal->ea.value.length); + + return eal; +} + +/**************************************************************************** + Read a list of EA names and data from an incoming data buffer. Create an ea_list with them. +****************************************************************************/ + +struct ea_list *read_nttrans_ea_list(TALLOC_CTX *ctx, const char *pdata, size_t data_size) +{ + struct ea_list *ea_list_head = NULL; + size_t offset = 0; + + if (data_size < 4) { + return NULL; + } + + while (offset + 4 <= data_size) { + size_t next_offset = IVAL(pdata,offset); + struct ea_list *eal = read_ea_list_entry(ctx, pdata + offset + 4, data_size - offset - 4, NULL); + + if (!eal) { + return NULL; + } + + DLIST_ADD_END(ea_list_head, eal, struct ea_list *); + if (next_offset == 0) { + break; + } + + /* Integer wrap protection for the increment. */ + if (offset + next_offset < offset) { + break; + } + + offset += next_offset; + + /* Integer wrap protection for while loop. */ + if (offset + 4 < offset) { + break; + } + + } + + return ea_list_head; +} diff --git a/source3/lib/util_ea.h b/source3/lib/util_ea.h new file mode 100644 index 0000000000..54423ac287 --- /dev/null +++ b/source3/lib/util_ea.h @@ -0,0 +1,36 @@ +/* + Unix SMB/CIFS implementation. + SMB Extended attribute buffer handling + Copyright (C) Jeremy Allison 2005-2013 + Copyright (C) Tim Prouty 2008 + + 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/>. +*/ + +#ifndef __LIB_UTIL_EA_H__ +#define __LIB_UTIL_EA_H__ + +/**************************************************************************** + Read one EA list entry from a buffer. +****************************************************************************/ + +struct ea_list *read_ea_list_entry(TALLOC_CTX *ctx, const char *pdata, size_t data_size, size_t *pbytes_used); + +/**************************************************************************** + Read a list of EA names and data from an incoming data buffer. Create an ea_list with them. +****************************************************************************/ + +struct ea_list *read_nttrans_ea_list(TALLOC_CTX *ctx, const char *pdata, size_t data_size); + +#endif /* __LIB_UTIL_EA_H__ */ |