s3: Convert libsmb/cli_message to the async API

1 files changed, 348 insertions, 97 deletions

diff --git a/source3/libsmb/climessage.c b/source3/libsmb/climessage.c
index 6538902f5d..2c8ef58b51 100644
--- a/source3/libsmb/climessage.c
+++ b/source3/libsmb/climessage.c
@@ -1,162 +1,413 @@
-/* 
+/*
    Unix SMB/CIFS implementation.
    client message handling routines
    Copyright (C) Andrew Tridgell 1994-1998
-   
+
    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"
 
-/****************************************************************************
- Start a message sequence.
-****************************************************************************/
+struct cli_message_start_state {
+	uint16_t grp;
+};
+
+static void cli_message_start_done(struct tevent_req *subreq);
 
-int cli_message_start_build(struct cli_state *cli, const char *host, const char *username)
+static struct tevent_req *cli_message_start_send(TALLOC_CTX *mem_ctx,
+						 struct tevent_context *ev,
+						 struct cli_state *cli,
+						 const char *host,
+						 const char *username)
 {
-	char *p;
+	struct tevent_req *req, *subreq;
+	struct cli_message_start_state *state;
+	char *htmp = NULL;
+	char *utmp = NULL;
+	size_t hlen, ulen;
+	uint8_t *bytes, *p;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct cli_message_start_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	if (!convert_string_talloc(talloc_tos(), CH_UNIX, CH_DOS,
+				   username, strlen(username)+1,
+				   &utmp, &ulen, true)) {
+		goto fail;
+	}
+	if (!convert_string_talloc(talloc_tos(), CH_UNIX, CH_DOS,
+				   host, strlen(host)+1,
+				   &htmp, &hlen, true)) {
+		goto fail;
+	}
 
-	/* construct a SMBsendstrt command */
-	memset(cli->outbuf,'\0',smb_size);
-	cli_set_message(cli->outbuf,0,0,True);
-	SCVAL(cli->outbuf,smb_com,SMBsendstrt);
-	SSVAL(cli->outbuf,smb_tid,cli->cnum);
-	cli_setup_packet(cli);
+	bytes = talloc_array(state, uint8_t, ulen+hlen+2);
+	if (bytes == NULL) {
+		goto fail;
+	}
+	p = bytes;
 
-	p = smb_buf(cli->outbuf);
 	*p++ = 4;
-	p += clistr_push(cli, p, username,
-			cli->bufsize - PTR_DIFF(p,cli->outbuf), STR_ASCII|STR_TERMINATE);
+	memcpy(p, utmp, ulen);
 	*p++ = 4;
-	p += clistr_push(cli, p, host,
-			cli->bufsize - PTR_DIFF(p,cli->outbuf), STR_ASCII|STR_TERMINATE);
+	memcpy(p, htmp, hlen);
+	TALLOC_FREE(htmp);
+	TALLOC_FREE(utmp);
+
+	subreq = cli_smb_send(state, ev, cli, SMBsendstrt, 0, 0, NULL,
+			      talloc_get_size(bytes), bytes);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, cli_message_start_done, req);
+	return req;
+fail:
+	TALLOC_FREE(htmp);
+	TALLOC_FREE(utmp);
+	tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
+	return tevent_req_post(req, ev);
+}
 
-	cli_setup_bcc(cli, p);
+static void cli_message_start_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct cli_message_start_state *state = tevent_req_data(
+		req, struct cli_message_start_state);
+	NTSTATUS status;
+	uint8_t wct;
+	uint16_t *vwv;
+
+	status = cli_smb_recv(subreq, 0, &wct, &vwv, NULL, NULL);
+	if (!NT_STATUS_IS_OK(status)) {
+		TALLOC_FREE(subreq);
+		tevent_req_nterror(req, status);
+		return;
+	}
+	if (wct >= 1) {
+		state->grp = SVAL(vwv+0, 0);
+	} else {
+		state->grp = 0;
+	}
+	TALLOC_FREE(subreq);
+	tevent_req_done(req);
+}
 
-	return(PTR_DIFF(p, cli->outbuf));
+static NTSTATUS cli_message_start_recv(struct tevent_req *req,
+				       uint16_t *pgrp)
+{
+	struct cli_message_start_state *state = tevent_req_data(
+		req, struct cli_message_start_state);
+	NTSTATUS status;
+
+	if (tevent_req_is_nterror(req, &status)) {
+		return status;
+	}
+	*pgrp = state->grp;
+	return NT_STATUS_OK;
 }
 
-bool cli_message_start(struct cli_state *cli, const char *host, const char *username,
-			      int *grp)
+struct cli_message_text_state {
+	uint16_t vwv;
+};
+
+static void cli_message_text_done(struct tevent_req *subreq);
+
+static struct tevent_req *cli_message_text_send(TALLOC_CTX *mem_ctx,
+						struct tevent_context *ev,
+						struct cli_state *cli,
+						uint16_t grp,
+						const char *msg,
+						int msglen)
 {
-	cli_message_start_build(cli, host, username);
-	cli_send_smb(cli);
+	struct tevent_req *req, *subreq;
+	struct cli_message_text_state *state;
+	char *tmp;
+	size_t tmplen;
+	uint8_t *bytes;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct cli_message_text_state);
+	if (req == NULL) {
+		return NULL;
+	}
 
-	if (!cli_receive_smb(cli)) {
-		return False;
+	SSVAL(&state->vwv, 0, grp);
+
+	if (convert_string_talloc(talloc_tos(), CH_UNIX, CH_DOS, msg, msglen,
+				  &tmp, &tmplen, true)) {
+		msg = tmp;
+		msglen = tmplen;
+	} else {
+		DEBUG(3, ("Conversion failed, sending message in UNIX "
+			  "charset\n"));
+		tmp = NULL;
 	}
 
-	if (cli_is_error(cli)) return False;
+	bytes = talloc_array(state, uint8_t, msglen+3);
+	if (tevent_req_nomem(bytes, req)) {
+		TALLOC_FREE(tmp);
+		return tevent_req_post(req, ev);
+	}
+	SCVAL(bytes, 0, 0);	/* pad */
+	SSVAL(bytes, 1, msglen);
+	memcpy(bytes+3, msg, msglen);
+	TALLOC_FREE(tmp);
+
+	subreq = cli_smb_send(state, ev, cli, SMBsendtxt, 0, 1, &state->vwv,
+			      talloc_get_size(bytes), bytes);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, cli_message_text_done, req);
+	return req;
+}
 
-	*grp = SVAL(cli->inbuf,smb_vwv0);
+static void cli_message_text_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	NTSTATUS status;
+
+	status = cli_smb_recv(subreq, 0, NULL, NULL, NULL, NULL);
+	TALLOC_FREE(subreq);
+	if (!NT_STATUS_IS_OK(status)) {
+		tevent_req_nterror(req, status);
+		return;
+	}
+	tevent_req_done(req);
+}
 
-	return True;
+static NTSTATUS cli_message_text_recv(struct tevent_req *req)
+{
+	return tevent_req_simple_recv_ntstatus(req);
 }
 
-/****************************************************************************
- Send a message
-****************************************************************************/
+struct cli_message_end_state {
+	uint16_t vwv;
+};
 
-int cli_message_text_build(struct cli_state *cli, const char *msg, int len, int grp)
+static void cli_message_end_done(struct tevent_req *subreq);
+
+static struct tevent_req *cli_message_end_send(TALLOC_CTX *mem_ctx,
+						struct tevent_context *ev,
+						struct cli_state *cli,
+						uint16_t grp)
 {
-	char *msgdos;
-	size_t lendos;
-	char *p;
-
-	memset(cli->outbuf,'\0',smb_size);
-	cli_set_message(cli->outbuf,1,0,True);
-	SCVAL(cli->outbuf,smb_com,SMBsendtxt);
-	SSVAL(cli->outbuf,smb_tid,cli->cnum);
-	cli_setup_packet(cli);
-
-	SSVAL(cli->outbuf,smb_vwv0,grp);
-
-	p = smb_buf(cli->outbuf);
-	*p++ = 1;
-
-	if (!convert_string_talloc(talloc_tos(), CH_UNIX, CH_DOS, msg, len,
-		(void **)(void *)&msgdos, &lendos, True) || !msgdos) {
-		DEBUG(3,("Conversion failed, sending message in UNIX charset\n"));
-		SSVAL(p, 0, len); p += 2;
-		if (len > cli->bufsize - PTR_DIFF(p,cli->outbuf)) {
-			return -1;
-		}
-		memcpy(p, msg, len);
-		p += len;
-	} else {
-		SSVAL(p, 0, lendos); p += 2;
-		if (lendos > cli->bufsize - PTR_DIFF(p,cli->outbuf)) {
-			return -1;
-		}
-		memcpy(p, msgdos, lendos);
-		p += lendos;
-		TALLOC_FREE(msgdos);
+	struct tevent_req *req, *subreq;
+	struct cli_message_end_state *state;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct cli_message_end_state);
+	if (req == NULL) {
+		return NULL;
 	}
 
-	cli_setup_bcc(cli, p);
+	SSVAL(&state->vwv, 0, grp);
+
+	subreq = cli_smb_send(state, ev, cli, SMBsendend, 0, 1, &state->vwv,
+			      0, NULL);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, cli_message_end_done, req);
+	return req;
+}
 
-	return(PTR_DIFF(p, cli->outbuf));
+static void cli_message_end_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	NTSTATUS status;
+
+	status = cli_smb_recv(subreq, 0, NULL, NULL, NULL, NULL);
+	TALLOC_FREE(subreq);
+	if (!NT_STATUS_IS_OK(status)) {
+		tevent_req_nterror(req, status);
+		return;
+	}
+	tevent_req_done(req);
 }
 
-bool cli_message_text(struct cli_state *cli, const char *msg, int len, int grp)
+static NTSTATUS cli_message_end_recv(struct tevent_req *req)
 {
-	cli_message_text_build(cli, msg, len, grp);
+	return tevent_req_simple_recv_ntstatus(req);
+}
 
-	cli_send_smb(cli);
+struct cli_message_state {
+	struct tevent_context *ev;
+	struct cli_state *cli;
+	size_t sent;
+	const char *message;
+	uint16_t grp;
+};
+
+static void cli_message_started(struct tevent_req *subreq);
+static void cli_message_sent(struct tevent_req *subreq);
+static void cli_message_done(struct tevent_req *subreq);
+
+struct tevent_req *cli_message_send(TALLOC_CTX *mem_ctx,
+				    struct tevent_context *ev,
+				    struct cli_state *cli,
+				    const char *host, const char *username,
+				    const char *message)
+{
+	struct tevent_req *req, *subreq;
+	struct cli_message_state *state;
 
-	if (!cli_receive_smb(cli)) {
-		return False;
+	req = tevent_req_create(mem_ctx, &state, struct cli_message_state);
+	if (req == NULL) {
+		return NULL;
 	}
+	state->ev = ev;
+	state->cli = cli;
+	state->sent = 0;
+	state->message = message;
+
+	subreq = cli_message_start_send(state, ev, cli, host, username);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, cli_message_started, req);
+	return req;
+}
 
-	if (cli_is_error(cli)) return False;
+static void cli_message_started(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct cli_message_state *state = tevent_req_data(
+		req, struct cli_message_state);
+	NTSTATUS status;
+	size_t thistime;
+
+	status = cli_message_start_recv(subreq, &state->grp);
+	TALLOC_FREE(subreq);
+	if (!NT_STATUS_IS_OK(status)) {
+		tevent_req_nterror(req, status);
+		return;
+	}
 
-	return True;
-}
+	thistime = MIN(127, strlen(state->message));
 
-/****************************************************************************
- End a message.
-****************************************************************************/
+	subreq = cli_message_text_send(state, state->ev, state->cli,
+				       state->grp, state->message, thistime);
+	if (tevent_req_nomem(subreq, req)) {
+		return;
+	}
+	state->sent += thistime;
+	tevent_req_set_callback(subreq, cli_message_sent, req);
+}
 
-int cli_message_end_build(struct cli_state *cli, int grp)
+static void cli_message_sent(struct tevent_req *subreq)
 {
-	char *p;
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct cli_message_state *state = tevent_req_data(
+		req, struct cli_message_state);
+	NTSTATUS status;
+	size_t left, thistime;
+
+	status = cli_message_text_recv(subreq);
+	TALLOC_FREE(subreq);
+	if (!NT_STATUS_IS_OK(status)) {
+		tevent_req_nterror(req, status);
+		return;
+	}
 
-	memset(cli->outbuf,'\0',smb_size);
-	cli_set_message(cli->outbuf,1,0,True);
-	SCVAL(cli->outbuf,smb_com,SMBsendend);
-	SSVAL(cli->outbuf,smb_tid,cli->cnum);
+	if (state->sent >= strlen(state->message)) {
+		subreq = cli_message_end_send(state, state->ev, state->cli,
+					      state->grp);
+		if (tevent_req_nomem(subreq, req)) {
+			return;
+		}
+		tevent_req_set_callback(subreq, cli_message_done, req);
+		return;
+	}
 
-	SSVAL(cli->outbuf,smb_vwv0,grp);
+	left = strlen(state->message) - state->sent;
+	thistime = MIN(127, left);
 
-	cli_setup_packet(cli);
+	subreq = cli_message_text_send(state, state->ev, state->cli,
+				       state->grp,
+				       state->message + state->sent,
+				       thistime);
+	if (tevent_req_nomem(subreq, req)) {
+		return;
+	}
+	state->sent += thistime;
+	tevent_req_set_callback(subreq, cli_message_sent, req);
+}
 
-	p = smb_buf(cli->outbuf);
+static void cli_message_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	NTSTATUS status;
+
+	status = cli_message_end_recv(subreq);
+	TALLOC_FREE(subreq);
+	if (!NT_STATUS_IS_OK(status)) {
+		tevent_req_nterror(req, status);
+		return;
+	}
+	tevent_req_done(req);
+}
 
-	return(PTR_DIFF(p, cli->outbuf));
+NTSTATUS cli_message_recv(struct tevent_req *req)
+{
+	return tevent_req_simple_recv_ntstatus(req);
 }
 
-bool cli_message_end(struct cli_state *cli, int grp)
+NTSTATUS cli_message(struct cli_state *cli, const char *host,
+		     const char *username, const char *message)
 {
-	cli_message_end_build(cli, grp);
+	TALLOC_CTX *frame = talloc_stackframe();
+	struct event_context *ev;
+	struct tevent_req *req;
+	NTSTATUS status = NT_STATUS_OK;
+
+	if (cli_has_async_calls(cli)) {
+		/*
+		 * Can't use sync call while an async call is in flight
+		 */
+		status = NT_STATUS_INVALID_PARAMETER;
+		goto fail;
+	}
 
-	cli_send_smb(cli);
+	ev = event_context_init(frame);
+	if (ev == NULL) {
+		status = NT_STATUS_NO_MEMORY;
+		goto fail;
+	}
 
-	if (!cli_receive_smb(cli)) {
-		return False;
+	req = cli_message_send(frame, ev, cli, host, username, message);
+	if (req == NULL) {
+		status = NT_STATUS_NO_MEMORY;
+		goto fail;
 	}
 
-	if (cli_is_error(cli)) return False;
+	if (!tevent_req_poll(req, ev)) {
+		status = map_nt_error_from_unix(errno);
+		goto fail;
+	}
 
-	return True;
+	status = cli_message_recv(req);
+ fail:
+	TALLOC_FREE(frame);
+	return status;
 }