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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-05 17:47:29 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-05 17:47:29 +0000 |
commit | 4f5791ebd03eaec1c7da0865a383175b05102712 (patch) | |
tree | 8ce7b00f7a76baa386372422adebbe64510812d4 /source4/libcli/raw/raweas.c | |
parent | Initial commit. (diff) | |
download | samba-4f5791ebd03eaec1c7da0865a383175b05102712.tar.xz samba-4f5791ebd03eaec1c7da0865a383175b05102712.zip |
Adding upstream version 2:4.17.12+dfsg.upstream/2%4.17.12+dfsgupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'source4/libcli/raw/raweas.c')
-rw-r--r-- | source4/libcli/raw/raweas.c | 371 |
1 files changed, 371 insertions, 0 deletions
diff --git a/source4/libcli/raw/raweas.c b/source4/libcli/raw/raweas.c new file mode 100644 index 0000000..2f551b0 --- /dev/null +++ b/source4/libcli/raw/raweas.c @@ -0,0 +1,371 @@ +/* + 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 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 "libcli/raw/libcliraw.h" +#include "libcli/raw/raw_proto.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 +*/ +size_t ea_list_size(unsigned int num_eas, struct ea_struct *eas) +{ + unsigned int 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; +} + +/* + work out how many bytes on the wire a ea name list will consume. +*/ +static unsigned int ea_name_list_size(unsigned int num_names, struct ea_name *eas) +{ + unsigned int total = 4; + int i; + for (i=0;i<num_names;i++) { + total += 1 + strlen(eas[i].name.s) + 1; + } + return total; +} + +/* + work out how many bytes on the wire a chained ea list will consume. + This assumes the names are strict ascii, which should be a + reasonable assumption +*/ +size_t ea_list_size_chained(unsigned int num_eas, struct ea_struct *eas, unsigned alignment) +{ + unsigned int total = 0; + int i; + for (i=0;i<num_eas;i++) { + unsigned int len = 8 + strlen(eas[i].name.s)+1 + eas[i].value.length; + len = (len + (alignment-1)) & ~(alignment-1); + total += len; + } + 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(uint8_t *data, unsigned int num_eas, struct ea_struct *eas) +{ + int i; + uint32_t ea_size; + + ea_size = ea_list_size(num_eas, eas); + + SIVAL(data, 0, ea_size); + data += 4; + + for (i=0;i<num_eas;i++) { + unsigned int 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); + if (eas[i].value.length > 0) { + memcpy(data + 4 + nlen + 1, + eas[i].value.data, + eas[i].value.length); + } + data += 4+nlen+1+eas[i].value.length; + } +} + + +/* + put a chained ea_list into a pre-allocated buffer - buffer must be + at least of size ea_list_size() +*/ +void ea_put_list_chained(uint8_t *data, unsigned int num_eas, struct ea_struct *eas, + unsigned alignment) +{ + int i; + + for (i=0;i<num_eas;i++) { + unsigned int nlen = strlen(eas[i].name.s); + uint32_t len = 8+nlen+1+eas[i].value.length; + unsigned int pad = ((len + (alignment-1)) & ~(alignment-1)) - len; + if (i == num_eas-1) { + SIVAL(data, 0, 0); + } else { + SIVAL(data, 0, len+pad); + } + SCVAL(data, 4, eas[i].flags); + SCVAL(data, 5, nlen); + SSVAL(data, 6, eas[i].value.length); + memcpy(data+8, eas[i].name.s, nlen+1); + memcpy(data+8+nlen+1, eas[i].value.data, eas[i].value.length); + memset(data+len, 0, pad); + data += len + pad; + } +} + + +/* + pull a ea_struct from a buffer. Return the number of bytes consumed +*/ +unsigned int ea_pull_struct(const DATA_BLOB *blob, + TALLOC_CTX *mem_ctx, + struct ea_struct *ea) +{ + uint8_t nlen; + uint16_t vlen; + + ZERO_STRUCTP(ea); + + 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, (const char *)(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, + unsigned int *num_eas, struct ea_struct **eas) +{ + int n; + uint32_t 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) { + unsigned int len; + DATA_BLOB blob2; + + blob2.data = blob->data + ofs; + blob2.length = ea_size - ofs; + + *eas = talloc_realloc(mem_ctx, *eas, struct ea_struct, 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; +} + + +/* + pull a chained ea_list from a buffer +*/ +NTSTATUS ea_pull_list_chained(const DATA_BLOB *blob, + TALLOC_CTX *mem_ctx, + unsigned int *num_eas, struct ea_struct **eas) +{ + int n; + uint32_t ofs; + + if (blob->length < 4) { + return NT_STATUS_INFO_LENGTH_MISMATCH; + } + + ofs = 0; + n = 0; + *num_eas = 0; + *eas = NULL; + + while (ofs < blob->length) { + unsigned int len; + DATA_BLOB blob2; + uint32_t next_ofs = IVAL(blob->data, ofs); + + blob2.data = blob->data + ofs + 4; + blob2.length = blob->length - (ofs + 4); + + *eas = talloc_realloc(mem_ctx, *eas, struct ea_struct, 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; + } + + if (ofs + next_ofs < ofs) { + return NT_STATUS_INVALID_PARAMETER; + } + + ofs += next_ofs; + if (ofs+4 > blob->length || ofs+4 < ofs) { + return NT_STATUS_INVALID_PARAMETER; + } + n++; + if (next_ofs == 0) break; + } + + *num_eas = n; + + return NT_STATUS_OK; +} + + +/* + pull a ea_name from a buffer. Return the number of bytes consumed +*/ +static unsigned int ea_pull_name(const DATA_BLOB *blob, + TALLOC_CTX *mem_ctx, + struct ea_name *ea) +{ + uint8_t nlen; + + if (blob->length < 2) { + return 0; + } + + nlen = CVAL(blob->data, 0); + + if (nlen+2 > blob->length) { + return 0; + } + + ea->name.s = talloc_strndup(mem_ctx, (const char *)(blob->data+1), nlen); + ea->name.private_length = nlen; + + return nlen+2; +} + + +/* + pull a ea_name list from a buffer +*/ +NTSTATUS ea_pull_name_list(const DATA_BLOB *blob, + TALLOC_CTX *mem_ctx, + unsigned int *num_names, struct ea_name **ea_names) +{ + int n; + uint32_t 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_names = 0; + *ea_names = NULL; + + while (ofs < ea_size) { + unsigned int len; + DATA_BLOB blob2; + + blob2.data = blob->data + ofs; + blob2.length = ea_size - ofs; + + *ea_names = talloc_realloc(mem_ctx, *ea_names, struct ea_name, n+1); + if (! *ea_names) return NT_STATUS_NO_MEMORY; + + len = ea_pull_name(&blob2, mem_ctx, &(*ea_names)[n]); + if (len == 0) { + return NT_STATUS_INVALID_PARAMETER; + } + + ofs += len; + n++; + } + + *num_names = n; + + return NT_STATUS_OK; +} + + +/* + put a ea_name list into a data blob +*/ +bool ea_push_name_list(TALLOC_CTX *mem_ctx, + DATA_BLOB *data, unsigned int num_names, struct ea_name *eas) +{ + int i; + uint32_t ea_size; + uint32_t off; + + ea_size = ea_name_list_size(num_names, eas); + + *data = data_blob_talloc(mem_ctx, NULL, ea_size); + if (data->data == NULL) { + return false; + } + + SIVAL(data->data, 0, ea_size); + off = 4; + + for (i=0;i<num_names;i++) { + unsigned int nlen = strlen(eas[i].name.s); + SCVAL(data->data, off, nlen); + memcpy(data->data+off+1, eas[i].name.s, nlen+1); + off += 1+nlen+1; + } + + return true; +} |