--- /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 / jra / samba / .git / commitdiff