+++ /dev/null
-/*
- Unix SMB/CIFS implementation.
- Infrastructure for async SMB client requests
- Copyright (C) Volker Lendecke 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"
-
-/*
- * Fetch an error out of a NBT packet
- */
-
-NTSTATUS cli_pull_error(char *buf)
-{
- uint32_t flags2 = SVAL(buf, smb_flg2);
-
- if (flags2 & FLAGS2_32_BIT_ERROR_CODES) {
- return NT_STATUS(IVAL(buf, smb_rcls));
- }
-
- return NT_STATUS_DOS(CVAL(buf, smb_rcls), SVAL(buf,smb_err));
-}
-
-/*
- * Compatibility helper for the sync APIs: Fake NTSTATUS in cli->inbuf
- */
-
-void cli_set_error(struct cli_state *cli, NTSTATUS status)
-{
- uint32_t flags2 = SVAL(cli->inbuf, smb_flg2);
-
- if (NT_STATUS_IS_DOS(status)) {
- SSVAL(cli->inbuf, smb_flg2,
- flags2 & ~FLAGS2_32_BIT_ERROR_CODES);
- SCVAL(cli->inbuf, smb_rcls, NT_STATUS_DOS_CLASS(status));
- SSVAL(cli->inbuf, smb_err, NT_STATUS_DOS_CODE(status));
- return;
- }
-
- SSVAL(cli->inbuf, smb_flg2, flags2 | FLAGS2_32_BIT_ERROR_CODES);
- SIVAL(cli->inbuf, smb_rcls, NT_STATUS_V(status));
- return;
-}
-
-/*
- * Allocate a new mid
- */
-
-static uint16_t cli_new_mid(struct cli_state *cli)
-{
- uint16_t result;
- struct cli_request *req;
-
- while (true) {
- result = cli->mid++;
- if (result == 0) {
- continue;
- }
-
- for (req = cli->outstanding_requests; req; req = req->next) {
- if (result == req->mid) {
- break;
- }
- }
-
- if (req == NULL) {
- return result;
- }
- }
-}
-
-static char *cli_request_print(TALLOC_CTX *mem_ctx, struct async_req *req)
-{
- char *result = async_req_print(mem_ctx, req);
- struct cli_request *cli_req = cli_request_get(req);
-
- if (result == NULL) {
- return NULL;
- }
-
- return talloc_asprintf_append_buffer(
- result, "mid=%d\n", cli_req->mid);
-}
-
-static int cli_request_destructor(struct cli_request *req)
-{
- if (req->enc_state != NULL) {
- common_free_enc_buffer(req->enc_state, req->outbuf);
- }
- DLIST_REMOVE(req->cli->outstanding_requests, req);
- return 0;
-}
-
-/*
- * Create a fresh async smb request
- */
-
-struct async_req *cli_request_new(TALLOC_CTX *mem_ctx,
- struct event_context *ev,
- struct cli_state *cli,
- uint8_t num_words, size_t num_bytes,
- struct cli_request **preq)
-{
- struct async_req *result;
- struct cli_request *cli_req;
- size_t bufsize = smb_size + num_words * 2 + num_bytes;
-
- result = async_req_new(mem_ctx, ev);
- if (result == NULL) {
- return NULL;
- }
-
- cli_req = (struct cli_request *)talloc_size(
- result, sizeof(*cli_req) + bufsize);
- if (cli_req == NULL) {
- TALLOC_FREE(result);
- return NULL;
- }
- talloc_set_name_const(cli_req, "struct cli_request");
- result->private_data = cli_req;
- result->print = cli_request_print;
-
- cli_req->async = result;
- cli_req->cli = cli;
- cli_req->outbuf = ((char *)cli_req + sizeof(*cli_req));
- cli_req->sent = 0;
- cli_req->mid = cli_new_mid(cli);
- cli_req->inbuf = NULL;
- cli_req->enc_state = NULL;
-
- SCVAL(cli_req->outbuf, smb_wct, num_words);
- SSVAL(cli_req->outbuf, smb_vwv + num_words * 2, num_bytes);
-
- DLIST_ADD_END(cli->outstanding_requests, cli_req,
- struct cli_request *);
- talloc_set_destructor(cli_req, cli_request_destructor);
-
- DEBUG(10, ("cli_request_new: mid=%d\n", cli_req->mid));
-
- *preq = cli_req;
- return result;
-}
-
-/*
- * Convenience function to get the SMB part out of an async_req
- */
-
-struct cli_request *cli_request_get(struct async_req *req)
-{
- if (req == NULL) {
- return NULL;
- }
- return talloc_get_type_abort(req->private_data, struct cli_request);
-}
-
-/*
- * A PDU has arrived on cli->evt_inbuf
- */
-
-static void handle_incoming_pdu(struct cli_state *cli)
-{
- struct cli_request *req;
- uint16_t mid;
- size_t raw_pdu_len, buf_len, pdu_len;
- size_t rest_len;
- NTSTATUS status;
-
- /*
- * The encrypted PDU len might differ from the unencrypted one
- */
- raw_pdu_len = smb_len(cli->evt_inbuf) + 4;
-
- /*
- * TODO: Handle oplock break requests
- */
-
- if (cli_encryption_on(cli) && CVAL(cli->evt_inbuf, 0) == 0) {
- uint16_t enc_ctx_num;
-
- status = get_enc_ctx_num((uint8_t *)cli->evt_inbuf,
- &enc_ctx_num);
- if (!NT_STATUS_IS_OK(status)) {
- DEBUG(10, ("get_enc_ctx_num returned %s\n",
- nt_errstr(status)));
- goto invalidate_requests;
- }
-
- if (enc_ctx_num != cli->trans_enc_state->enc_ctx_num) {
- DEBUG(10, ("wrong enc_ctx %d, expected %d\n",
- enc_ctx_num,
- cli->trans_enc_state->enc_ctx_num));
- status = NT_STATUS_INVALID_HANDLE;
- goto invalidate_requests;
- }
-
- status = common_decrypt_buffer(cli->trans_enc_state,
- cli->evt_inbuf);
- if (!NT_STATUS_IS_OK(status)) {
- DEBUG(10, ("common_decrypt_buffer returned %s\n",
- nt_errstr(status)));
- goto invalidate_requests;
- }
- }
-
- if (!cli_check_sign_mac(cli, cli->evt_inbuf)) {
- DEBUG(10, ("cli_check_sign_mac failed\n"));
- status = NT_STATUS_ACCESS_DENIED;
- goto invalidate_requests;
- }
-
- mid = SVAL(cli->evt_inbuf, smb_mid);
-
- DEBUG(10, ("handle_incoming_pdu: got mid %d\n", mid));
-
- for (req = cli->outstanding_requests; req; req = req->next) {
- if (req->mid == mid) {
- break;
- }
- }
-
- buf_len = talloc_get_size(cli->evt_inbuf);
- pdu_len = smb_len(cli->evt_inbuf) + 4;
- rest_len = buf_len - raw_pdu_len;
-
- if (req == NULL) {
- DEBUG(3, ("Request for mid %d not found, dumping PDU\n", mid));
-
- memmove(cli->evt_inbuf, cli->evt_inbuf + raw_pdu_len,
- buf_len - raw_pdu_len);
-
- cli->evt_inbuf = TALLOC_REALLOC_ARRAY(NULL, cli->evt_inbuf,
- char, rest_len);
- return;
- }
-
- if (buf_len == pdu_len) {
- /*
- * Optimal case: Exactly one PDU was in the socket buffer
- */
- req->inbuf = talloc_move(req, &cli->evt_inbuf);
- goto done;
- }
-
- DEBUG(11, ("buf_len = %d, pdu_len = %d, splitting buffer\n",
- (int)buf_len, (int)pdu_len));
-
- if (pdu_len < rest_len) {
- /*
- * The PDU is shorter, talloc_memdup that one.
- */
- req->inbuf = (char *)talloc_memdup(
- req, cli->evt_inbuf, pdu_len);
-
- memmove(cli->evt_inbuf,
- cli->evt_inbuf + raw_pdu_len,
- buf_len - raw_pdu_len);
-
- cli->evt_inbuf = TALLOC_REALLOC_ARRAY(
- NULL, cli->evt_inbuf, char, rest_len);
- }
- else {
- /*
- * The PDU is larger than the rest,
- * talloc_memdup the rest
- */
- req->inbuf = talloc_move(req, &cli->evt_inbuf);
-
- cli->evt_inbuf = (char *)talloc_memdup(
- cli, req->inbuf + raw_pdu_len,
- rest_len);
- }
-
- if ((req->inbuf == NULL) || (cli->evt_inbuf == NULL)) {
- status = NT_STATUS_NO_MEMORY;
- goto invalidate_requests;
- }
-
- done:
- async_req_done(req->async);
- return;
-
- invalidate_requests:
-
- DEBUG(10, ("handle_incoming_pdu: Aborting with %s\n",
- nt_errstr(status)));
-
- for (req = cli->outstanding_requests; req; req = req->next) {
- async_req_error(req->async, status);
- }
- return;
-}
-
-/*
- * fd event callback. This is the basic connection to the socket
- */
-
-static void cli_state_handler(struct event_context *event_ctx,
- struct fd_event *event, uint16 flags, void *p)
-{
- struct cli_state *cli = (struct cli_state *)p;
- struct cli_request *req;
-
- DEBUG(11, ("cli_state_handler called with flags %d\n", flags));
-
- if (flags & EVENT_FD_READ) {
- int res, available;
- size_t old_size, new_size;
- char *tmp;
-
- res = ioctl(cli->fd, FIONREAD, &available);
- if (res == -1) {
- DEBUG(10, ("ioctl(FIONREAD) failed: %s\n",
- strerror(errno)));
- goto sock_error;
- }
-
- if (available == 0) {
- /* EOF */
- goto sock_error;
- }
-
- old_size = talloc_get_size(cli->evt_inbuf);
- new_size = old_size + available;
-
- if (new_size < old_size) {
- /* wrap */
- goto sock_error;
- }
-
- tmp = TALLOC_REALLOC_ARRAY(cli, cli->evt_inbuf, char,
- new_size);
- if (tmp == NULL) {
- /* nomem */
- goto sock_error;
- }
- cli->evt_inbuf = tmp;
-
- res = recv(cli->fd, cli->evt_inbuf + old_size, available, 0);
- if (res == -1) {
- DEBUG(10, ("recv failed: %s\n", strerror(errno)));
- goto sock_error;
- }
-
- DEBUG(11, ("cli_state_handler: received %d bytes, "
- "smb_len(evt_inbuf) = %d\n", (int)res,
- smb_len(cli->evt_inbuf)));
-
- /* recv *might* have returned less than announced */
- new_size = old_size + res;
-
- /* shrink, so I don't expect errors here */
- cli->evt_inbuf = TALLOC_REALLOC_ARRAY(cli, cli->evt_inbuf,
- char, new_size);
-
- while ((cli->evt_inbuf != NULL)
- && ((smb_len(cli->evt_inbuf) + 4) <= new_size)) {
- /*
- * we've got a complete NBT level PDU in evt_inbuf
- */
- handle_incoming_pdu(cli);
- new_size = talloc_get_size(cli->evt_inbuf);
- }
- }
-
- if (flags & EVENT_FD_WRITE) {
- size_t to_send;
- ssize_t sent;
-
- for (req = cli->outstanding_requests; req; req = req->next) {
- to_send = smb_len(req->outbuf)+4;
- if (to_send > req->sent) {
- break;
- }
- }
-
- if (req == NULL) {
- event_fd_set_not_writeable(event);
- return;
- }
-
- sent = send(cli->fd, req->outbuf + req->sent,
- to_send - req->sent, 0);
-
- if (sent < 0) {
- goto sock_error;
- }
-
- req->sent += sent;
-
- if (req->sent == to_send) {
- return;
- }
- }
- return;
-
- sock_error:
- for (req = cli->outstanding_requests; req; req = req->next) {
- req->async->state = ASYNC_REQ_ERROR;
- req->async->status = map_nt_error_from_unix(errno);
- }
- TALLOC_FREE(cli->fd_event);
- close(cli->fd);
- cli->fd = -1;
-}
-
-/*
- * Holder for a talloc_destructor, we need to zero out the pointers in cli
- * when deleting
- */
-struct cli_tmp_event {
- struct cli_state *cli;
-};
-
-static int cli_tmp_event_destructor(struct cli_tmp_event *e)
-{
- TALLOC_FREE(e->cli->fd_event);
- TALLOC_FREE(e->cli->event_ctx);
- return 0;
-}
-
-/*
- * Create a temporary event context for use in the sync helper functions
- */
-
-struct cli_tmp_event *cli_tmp_event_ctx(TALLOC_CTX *mem_ctx,
- struct cli_state *cli)
-{
- struct cli_tmp_event *state;
-
- if (cli->event_ctx != NULL) {
- return NULL;
- }
-
- state = talloc(mem_ctx, struct cli_tmp_event);
- if (state == NULL) {
- return NULL;
- }
- state->cli = cli;
- talloc_set_destructor(state, cli_tmp_event_destructor);
-
- cli->event_ctx = event_context_init(state);
- if (cli->event_ctx == NULL) {
- TALLOC_FREE(state);
- return NULL;
- }
-
- cli->fd_event = event_add_fd(cli->event_ctx, state, cli->fd,
- EVENT_FD_READ, cli_state_handler, cli);
- if (cli->fd_event == NULL) {
- TALLOC_FREE(state);
- return NULL;
- }
- return state;
-}
-
-/*
- * Attach an event context permanently to a cli_struct
- */
-
-NTSTATUS cli_add_event_ctx(struct cli_state *cli,
- struct event_context *event_ctx)
-{
- cli->event_ctx = event_ctx;
- cli->fd_event = event_add_fd(event_ctx, cli, cli->fd, EVENT_FD_READ,
- cli_state_handler, cli);
- if (cli->fd_event == NULL) {
- return NT_STATUS_NO_MEMORY;
- }
- return NT_STATUS_OK;
-}
git.samba.org / gd / samba / .git / commitdiff