cifs_buf_release(pSMB);
return rc;
}
+
#ifdef CONFIG_CIFS_XATTR
+/*
+ * Do a path-based QUERY_ALL_EAS call and parse the result. This is a common
+ * function used by listxattr and getxattr type calls. When ea_name is set,
+ * it looks for that attribute name and stuffs that value into the EAData
+ * buffer. When ea_name is NULL, it stuffs a list of attribute names into the
+ * buffer. In both cases, the return value is either the length of the
+ * resulting data or a negative error code. If EAData is a NULL pointer then
+ * the data isn't copied to it, but the length is returned.
+ */
ssize_t
CIFSSMBQAllEAs(const int xid, struct cifsTconInfo *tcon,
- const unsigned char *searchName,
- char *EAData, size_t buf_size,
- const struct nls_table *nls_codepage, int remap)
+ const unsigned char *searchName, const unsigned char *ea_name,
+ char *EAData, size_t buf_size,
+ const struct nls_table *nls_codepage, int remap)
{
/* BB assumes one setup word */
TRANSACTION2_QPI_REQ *pSMB = NULL;
goto QAllEAsOut;
}
- /* account for prefix user. and trailing null */
- rc += (5 + 1 + name_len);
- if (rc < (int) buf_size) {
- memcpy(EAData, "user.", 5);
- EAData += 5;
- memcpy(EAData, temp_ptr, name_len);
- EAData += name_len;
- /* null terminate name */
- *EAData = 0;
- ++EAData;
- } else if (buf_size == 0) {
- /* skip copy - calc size only */
+ if (ea_name) {
+ if (strncmp(ea_name, temp_ptr, name_len) == 0) {
+ temp_ptr += name_len + 1;
+ rc = value_len;
+ if (buf_size == 0)
+ goto QAllEAsOut;
+ if ((size_t)value_len > buf_size) {
+ rc = -ERANGE;
+ goto QAllEAsOut;
+ }
+ memcpy(EAData, temp_ptr, value_len);
+ goto QAllEAsOut;
+ }
} else {
- /* stop before overrun buffer */
- rc = -ERANGE;
- break;
+ /* account for prefix user. and trailing null */
+ rc += (5 + 1 + name_len);
+ if (rc < (int) buf_size) {
+ memcpy(EAData, "user.", 5);
+ EAData += 5;
+ memcpy(EAData, temp_ptr, name_len);
+ EAData += name_len;
+ /* null terminate name */
+ *EAData = 0;
+ ++EAData;
+ } else if (buf_size == 0) {
+ /* skip copy - calc size only */
+ } else {
+ /* stop before overrun buffer */
+ rc = -ERANGE;
+ break;
+ }
}
temp_ptr += name_len + 1 + value_len;
temp_fea = (struct fea *)temp_ptr;
}
+ /* didn't find the named attribute */
+ if (ea_name)
+ rc = -ENODATA;
+
QAllEAsOut:
cifs_buf_release(pSMB);
if (rc == -EAGAIN)
return (ssize_t)rc;
}
-ssize_t CIFSSMBQueryEA(const int xid, struct cifsTconInfo *tcon,
- const unsigned char *searchName, const unsigned char *ea_name,
- unsigned char *ea_value, size_t buf_size,
- const struct nls_table *nls_codepage, int remap)
-{
- TRANSACTION2_QPI_REQ *pSMB = NULL;
- TRANSACTION2_QPI_RSP *pSMBr = NULL;
- int rc = 0;
- int bytes_returned;
- int name_len;
- struct fea *temp_fea;
- char *temp_ptr;
- __u16 params, byte_count;
-
- cFYI(1, ("In Query EA path %s", searchName));
-QEARetry:
- rc = smb_init(SMB_COM_TRANSACTION2, 15, tcon, (void **) &pSMB,
- (void **) &pSMBr);
- if (rc)
- return rc;
-
- if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
- name_len =
- cifsConvertToUCS((__le16 *) pSMB->FileName, searchName,
- PATH_MAX, nls_codepage, remap);
- name_len++; /* trailing null */
- name_len *= 2;
- } else { /* BB improve the check for buffer overruns BB */
- name_len = strnlen(searchName, PATH_MAX);
- name_len++; /* trailing null */
- strncpy(pSMB->FileName, searchName, name_len);
- }
-
- params = 2 /* level */ + 4 /* reserved */ + name_len /* includes NUL */;
- pSMB->TotalDataCount = 0;
- pSMB->MaxParameterCount = cpu_to_le16(2);
- /* BB find exact max SMB PDU from sess structure BB */
- pSMB->MaxDataCount = cpu_to_le16(4000);
- pSMB->MaxSetupCount = 0;
- pSMB->Reserved = 0;
- pSMB->Flags = 0;
- pSMB->Timeout = 0;
- pSMB->Reserved2 = 0;
- pSMB->ParameterOffset = cpu_to_le16(offsetof(
- struct smb_com_transaction2_qpi_req, InformationLevel) - 4);
- pSMB->DataCount = 0;
- pSMB->DataOffset = 0;
- pSMB->SetupCount = 1;
- pSMB->Reserved3 = 0;
- pSMB->SubCommand = cpu_to_le16(TRANS2_QUERY_PATH_INFORMATION);
- byte_count = params + 1 /* pad */ ;
- pSMB->TotalParameterCount = cpu_to_le16(params);
- pSMB->ParameterCount = pSMB->TotalParameterCount;
- pSMB->InformationLevel = cpu_to_le16(SMB_INFO_QUERY_ALL_EAS);
- pSMB->Reserved4 = 0;
- pSMB->hdr.smb_buf_length += byte_count;
- pSMB->ByteCount = cpu_to_le16(byte_count);
-
- rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
- (struct smb_hdr *) pSMBr, &bytes_returned, 0);
- if (rc) {
- cFYI(1, ("Send error in Query EA = %d", rc));
- } else { /* decode response */
- rc = validate_t2((struct smb_t2_rsp *)pSMBr);
-
- /* BB also check enough total bytes returned */
- /* BB we need to improve the validity checking
- of these trans2 responses */
- if (rc || (pSMBr->ByteCount < 4))
- rc = -EIO; /* bad smb */
- /* else if (pFindData){
- memcpy((char *) pFindData,
- (char *) &pSMBr->hdr.Protocol +
- data_offset, kl);
- }*/ else {
- /* check that length of list is not more than bcc */
- /* check that each entry does not go beyond length
- of list */
- /* check that each element of each entry does not
- go beyond end of list */
- __u16 data_offset = le16_to_cpu(pSMBr->t2.DataOffset);
- struct fealist *ea_response_data;
- rc = -ENODATA;
- /* validate_trans2_offsets() */
- /* BB check if start of smb + data_offset > &bcc+ bcc*/
- ea_response_data = (struct fealist *)
- (((char *) &pSMBr->hdr.Protocol) +
- data_offset);
- name_len = le32_to_cpu(ea_response_data->list_len);
- cFYI(1, ("ea length %d", name_len));
- if (name_len <= 8) {
- /* returned EA size zeroed at top of function */
- cFYI(1, ("empty EA list returned from server"));
- } else {
- /* account for ea list len */
- name_len -= 4;
- temp_fea = ea_response_data->list;
- temp_ptr = (char *)temp_fea;
- /* loop through checking if we have a matching
- name and then return the associated value */
- while (name_len > 0) {
- __u16 value_len;
- name_len -= 4;
- temp_ptr += 4;
- value_len =
- le16_to_cpu(temp_fea->value_len);
- /* BB validate that value_len falls within SMB,
- even though maximum for name_len is 255 */
- if (memcmp(temp_fea->name, ea_name,
- temp_fea->name_len) == 0) {
- /* found a match */
- rc = value_len;
- /* account for prefix user. and trailing null */
- if (rc <= (int)buf_size) {
- memcpy(ea_value,
- temp_fea->name+temp_fea->name_len+1,
- rc);
- /* ea values, unlike ea
- names, are not null
- terminated */
- } else if (buf_size == 0) {
- /* skip copy - calc size only */
- } else {
- /* stop before overrun buffer */
- rc = -ERANGE;
- }
- break;
- }
- name_len -= temp_fea->name_len;
- temp_ptr += temp_fea->name_len;
- /* account for trailing null */
- name_len--;
- temp_ptr++;
- name_len -= value_len;
- temp_ptr += value_len;
- /* No trailing null to account for in
- value_len. Go on to next EA */
- temp_fea = (struct fea *)temp_ptr;
- }
- }
- }
- }
- cifs_buf_release(pSMB);
- if (rc == -EAGAIN)
- goto QEARetry;
-
- return (ssize_t)rc;
-}
-
int
CIFSSMBSetEA(const int xid, struct cifsTconInfo *tcon, const char *fileName,
const char *ea_name, const void *ea_value,
git://bbs.cooldavid.org / net-next-2.6.git / blobdiff