diff options
| -rw-r--r-- | source3/include/async_smb.h | 1 | ||||
| -rw-r--r-- | source3/libsmb/async_smb.c | 40 |
2 files changed, 29 insertions, 12 deletions
diff --git a/source3/include/async_smb.h b/source3/include/async_smb.h index 24ea6649d9..25fd353632 100644 --- a/source3/include/async_smb.h +++ b/source3/include/async_smb.h @@ -127,6 +127,7 @@ void cli_chain_uncork(struct cli_state *cli); bool cli_in_chain(struct cli_state *cli); bool smb_splice_chain(char **poutbuf, uint8_t smb_command, uint8_t wct, const uint16_t *vwv, + size_t bytes_alignment, uint16_t num_bytes, const uint8_t *bytes); NTSTATUS cli_pull_reply(struct async_req *req, diff --git a/source3/libsmb/async_smb.c b/source3/libsmb/async_smb.c index cf6886ff19..fd2fe930f8 100644 --- a/source3/libsmb/async_smb.c +++ b/source3/libsmb/async_smb.c @@ -223,6 +223,7 @@ static bool find_andx_cmd_ofs(char *buf, size_t *pofs) * @param[in] smb_command The command that we want to issue * @param[in] wct How many words? * @param[in] vwv The words, already in network order + * @param[in] bytes_alignment How shall we align "bytes"? * @param[in] num_bytes How many bytes? * @param[in] bytes The data the request ships * @@ -232,12 +233,14 @@ static bool find_andx_cmd_ofs(char *buf, size_t *pofs) bool smb_splice_chain(char **poutbuf, uint8_t smb_command, uint8_t wct, const uint16_t *vwv, + size_t bytes_alignment, uint16_t num_bytes, const uint8_t *bytes) { char *outbuf; size_t old_size, new_size; size_t ofs; - size_t padding = 0; + size_t chain_padding = 0; + size_t bytes_padding = 0; bool first_request; old_size = talloc_get_size(*poutbuf); @@ -251,17 +254,25 @@ bool smb_splice_chain(char **poutbuf, uint8_t smb_command, if (!first_request && ((old_size % 4) != 0)) { /* - * Align subsequent requests to a 4-byte boundary + * Align the wct field of subsequent requests to a 4-byte + * boundary */ - padding = 4 - (old_size % 4); + chain_padding = 4 - (old_size % 4); } /* - * We need space for the wct field, the words, the byte count field - * and the bytes themselves. + * After the old request comes the new wct field (1 byte), the vwv's + * and the num_bytes field. After at we might need to align the bytes + * given to us to "bytes_alignment", increasing the num_bytes value. */ - new_size = old_size + padding - + 1 + wct * sizeof(uint16_t) + 2 + num_bytes; + + new_size = old_size + chain_padding + 1 + wct * sizeof(uint16_t) + 2; + + if ((bytes_alignment != 0) && ((new_size % bytes_alignment) != 0)) { + bytes_padding = bytes_alignment + (new_size % bytes_alignment); + } + + new_size += bytes_padding + num_bytes; if (new_size > 0xffff) { DEBUG(1, ("splice_chain: %u bytes won't fit\n", @@ -288,9 +299,9 @@ bool smb_splice_chain(char **poutbuf, uint8_t smb_command, return false; } - if (padding != 0) { - memset(outbuf + old_size, 0, padding); - old_size += padding; + if (chain_padding != 0) { + memset(outbuf + old_size, 0, chain_padding); + old_size += chain_padding; } SCVAL(outbuf, andx_cmd_ofs, smb_command); @@ -305,9 +316,14 @@ bool smb_splice_chain(char **poutbuf, uint8_t smb_command, memcpy(outbuf + ofs, vwv, sizeof(uint16_t) * wct); ofs += sizeof(uint16_t) * wct; - SSVAL(outbuf, ofs, num_bytes); + SSVAL(outbuf, ofs, num_bytes + bytes_padding); ofs += sizeof(uint16_t); + if (bytes_padding != 0) { + memset(outbuf + ofs, 0, bytes_padding); + ofs += bytes_padding; + } + memcpy(outbuf + ofs, bytes, num_bytes); return true; @@ -407,7 +423,7 @@ static struct async_req *cli_request_chain(TALLOC_CTX *mem_ctx, cli_async_req_destructor); if (!smb_splice_chain(&req->outbuf, smb_command, wct, vwv, - num_bytes, bytes)) { + 0, num_bytes, bytes)) { goto fail; } |