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|
/*
* Unix SMB/CIFS implementation.
* RPC client transport over named pipes to a child smbd
* Copyright (C) Volker Lendecke 2009
*
* 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"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_RPC_CLI
/**
* struct rpc_cli_smbd_conn represents a forked smbd. This structure should
* exist only once per process which does the rpc calls.
*
* RPC pipe handles can be attached to this smbd connection with
* rpc_pipe_open_local().
*
* For this to work right, we can not use rpc_transport_np directly, because
* the child smbd wants to write its DEBUG output somewhere. We redirect the
* child's output to rpc_cli_smbd_conn->stdout_fd. While the RPC calls are
* active, we have an event context available and attach a fd event to the
* stdout_df.
*/
struct rpc_cli_smbd_conn {
/**
* The smb connection to handle the named pipe traffic over
*/
struct cli_state *cli;
/**
* Attached to stdout in the forked smbd, this is where smbd will
* print its DEBUG.
*/
int stdout_fd;
/**
* Custom callback provided by the owner of the
* rpc_cli_smbd_conn. Here we send the smbd DEBUG output. Can be NULL.
*/
struct {
void (*fn)(char *buf, size_t len, void *priv);
void *priv;
} stdout_callback ;
};
/**
* Event handler to be called whenever the forked smbd prints debugging
* output.
*/
static void rpc_cli_smbd_stdout_reader(struct event_context *ev,
struct fd_event *fde,
uint16_t flags, void *priv)
{
struct rpc_cli_smbd_conn *conn = talloc_get_type_abort(
priv, struct rpc_cli_smbd_conn);
char buf[1024];
ssize_t nread;
if ((flags & EVENT_FD_READ) == 0) {
return;
}
nread = read(conn->stdout_fd, buf, sizeof(buf)-1);
if (nread < 0) {
DEBUG(0, ("Could not read from smbd stdout: %s\n",
strerror(errno)));
TALLOC_FREE(fde);
return;
}
if (nread == 0) {
DEBUG(0, ("EOF from smbd stdout\n"));
TALLOC_FREE(fde);
return;
}
buf[nread] = '\0';
if (conn->stdout_callback.fn != NULL) {
conn->stdout_callback.fn(buf, nread,
conn->stdout_callback.priv);
}
}
/**
* struct rpc_transport_smbd_state is the link from a struct rpc_pipe_client
* to the rpc_cli_smbd_conn. We use a named pipe transport as a subtransport.
*/
struct rpc_transport_smbd_state {
struct rpc_cli_smbd_conn *conn;
struct rpc_cli_transport *sub_transp;
};
static int rpc_cli_smbd_conn_destructor(struct rpc_cli_smbd_conn *conn)
{
if (conn->cli != NULL) {
cli_shutdown(conn->cli);
conn->cli = NULL;
}
if (conn->stdout_fd != -1) {
close(conn->stdout_fd);
conn->stdout_fd = -1;
}
return 0;
}
/*
* Do the negprot/sesssetup/tcon to an anonymous ipc$ connection
*/
struct get_anon_ipc_state {
struct event_context *ev;
struct cli_state *cli;
};
static void get_anon_ipc_negprot_done(struct async_req *subreq);
static void get_anon_ipc_sesssetup_done(struct async_req *subreq);
static void get_anon_ipc_tcon_done(struct async_req *subreq);
static struct async_req *get_anon_ipc_send(TALLOC_CTX *mem_ctx,
struct event_context *ev,
struct cli_state *cli)
{
struct async_req *result, *subreq;
struct get_anon_ipc_state *state;
if (!async_req_setup(mem_ctx, &result, &state,
struct get_anon_ipc_state)) {
return NULL;
}
state->ev = ev;
state->cli = cli;
subreq = cli_negprot_send(state, ev, cli);
if (subreq == NULL) {
goto fail;
}
subreq->async.fn = get_anon_ipc_negprot_done;
subreq->async.priv = result;
return result;
fail:
TALLOC_FREE(result);
return NULL;
}
static void get_anon_ipc_negprot_done(struct async_req *subreq)
{
struct async_req *req = talloc_get_type_abort(
subreq->async.priv, struct async_req);
struct get_anon_ipc_state *state = talloc_get_type_abort(
req->private_data, struct get_anon_ipc_state);
NTSTATUS status;
status = cli_negprot_recv(subreq);
TALLOC_FREE(subreq);
if (!NT_STATUS_IS_OK(status)) {
async_req_nterror(req, status);
return;
}
subreq = cli_session_setup_guest_send(state, state->ev, state->cli);
if (async_req_nomem(subreq, req)) {
return;
}
subreq->async.fn = get_anon_ipc_sesssetup_done;
subreq->async.priv = req;
}
static void get_anon_ipc_sesssetup_done(struct async_req *subreq)
{
struct async_req *req = talloc_get_type_abort(
subreq->async.priv, struct async_req);
struct get_anon_ipc_state *state = talloc_get_type_abort(
req->private_data, struct get_anon_ipc_state);
NTSTATUS status;
status = cli_session_setup_guest_recv(subreq);
TALLOC_FREE(subreq);
if (!NT_STATUS_IS_OK(status)) {
async_req_nterror(req, status);
return;
}
subreq = cli_tcon_andx_send(state, state->ev, state->cli,
"IPC$", "IPC", NULL, 0);
if (async_req_nomem(subreq, req)) {
return;
}
subreq->async.fn = get_anon_ipc_tcon_done;
subreq->async.priv = req;
}
static void get_anon_ipc_tcon_done(struct async_req *subreq)
{
struct async_req *req = talloc_get_type_abort(
subreq->async.priv, struct async_req);
NTSTATUS status;
status = cli_tcon_andx_recv(subreq);
TALLOC_FREE(subreq);
if (!NT_STATUS_IS_OK(status)) {
async_req_nterror(req, status);
return;
}
async_req_done(req);
}
static NTSTATUS get_anon_ipc_recv(struct async_req *req)
{
return async_req_simple_recv_ntstatus(req);
}
struct rpc_cli_smbd_conn_init_state {
struct event_context *ev;
struct rpc_cli_smbd_conn *conn;
};
static void rpc_cli_smbd_conn_init_done(struct async_req *subreq);
struct async_req *rpc_cli_smbd_conn_init_send(TALLOC_CTX *mem_ctx,
struct event_context *ev,
void (*stdout_callback)(char *buf,
size_t len,
void *priv),
void *priv)
{
struct async_req *result, *subreq;
struct rpc_cli_smbd_conn_init_state *state;
int smb_sock[2];
int stdout_pipe[2];
NTSTATUS status;
pid_t pid;
int ret;
smb_sock[0] = smb_sock[1] = stdout_pipe[0] = stdout_pipe[1] = -1;
if (!async_req_setup(mem_ctx, &result, &state,
struct rpc_cli_smbd_conn_init_state)) {
return NULL;
}
state->ev = ev;
state->conn = talloc(state, struct rpc_cli_smbd_conn);
if (state->conn == NULL) {
goto nomem;
}
state->conn->cli = cli_initialise();
if (state->conn->cli == NULL) {
goto nomem;
}
state->conn->stdout_fd = -1;
state->conn->stdout_callback.fn = stdout_callback;
state->conn->stdout_callback.priv = priv;
talloc_set_destructor(state->conn, rpc_cli_smbd_conn_destructor);
ret = socketpair(AF_UNIX, SOCK_STREAM, 0, smb_sock);
if (ret == -1) {
status = map_nt_error_from_unix(errno);
goto post_status;
}
ret = pipe(stdout_pipe);
if (ret == -1) {
status = map_nt_error_from_unix(errno);
goto post_status;
}
pid = sys_fork();
if (pid == -1) {
status = map_nt_error_from_unix(errno);
goto post_status;
}
if (pid == 0) {
char *smbd_cmd;
close(smb_sock[0]);
close(stdout_pipe[0]);
close(0);
if (dup(smb_sock[1]) == -1) {
exit(1);
}
close(smb_sock[1]);
close(1);
if (dup(stdout_pipe[1]) == -1) {
exit(1);
}
close(stdout_pipe[1]);
smbd_cmd = getenv("SMB_PATH");
if ((smbd_cmd == NULL)
&& (asprintf(&smbd_cmd, "%s/smbd", get_dyn_SBINDIR())
== -1)) {
printf("no memory");
exit(1);
}
if (asprintf(&smbd_cmd, "%s -F -S -d %d", smbd_cmd,
DEBUGLEVEL) == -1) {
printf("no memory");
exit(1);
}
exit(system(smbd_cmd));
}
state->conn->cli->fd = smb_sock[0];
smb_sock[0] = -1;
close(smb_sock[1]);
smb_sock[1] = -1;
state->conn->stdout_fd = stdout_pipe[0];
stdout_pipe[0] = -1;
close(stdout_pipe[1]);
stdout_pipe[1] = -1;
subreq = get_anon_ipc_send(state, ev, state->conn->cli);
if (subreq == NULL) {
goto nomem;
}
if (event_add_fd(ev, state, state->conn->stdout_fd, EVENT_FD_READ,
rpc_cli_smbd_stdout_reader, state->conn) == NULL) {
goto nomem;
}
subreq->async.fn = rpc_cli_smbd_conn_init_done;
subreq->async.priv = result;
return result;
nomem:
status = NT_STATUS_NO_MEMORY;
post_status:
if (smb_sock[0] != -1) {
close(smb_sock[0]);
}
if (smb_sock[1] != -1) {
close(smb_sock[1]);
}
if (stdout_pipe[0] != -1) {
close(stdout_pipe[0]);
}
if (stdout_pipe[1] != -1) {
close(stdout_pipe[1]);
}
if (async_post_ntstatus(result, ev, status)) {
return result;
}
TALLOC_FREE(result);
return NULL;
}
static void rpc_cli_smbd_conn_init_done(struct async_req *subreq)
{
struct async_req *req = talloc_get_type_abort(
subreq->async.priv, struct async_req);
NTSTATUS status;
status = get_anon_ipc_recv(subreq);
TALLOC_FREE(subreq);
if (!NT_STATUS_IS_OK(status)) {
async_req_nterror(req, status);
return;
}
async_req_done(req);
}
NTSTATUS rpc_cli_smbd_conn_init_recv(struct async_req *req,
TALLOC_CTX *mem_ctx,
struct rpc_cli_smbd_conn **pconn)
{
struct rpc_cli_smbd_conn_init_state *state = talloc_get_type_abort(
req->private_data, struct rpc_cli_smbd_conn_init_state);
NTSTATUS status;
if (async_req_is_nterror(req, &status)) {
return status;
}
*pconn = talloc_move(mem_ctx, &state->conn);
return NT_STATUS_OK;
}
NTSTATUS rpc_cli_smbd_conn_init(TALLOC_CTX *mem_ctx,
struct rpc_cli_smbd_conn **pconn,
void (*stdout_callback)(char *buf,
size_t len,
void *priv),
void *priv)
{
TALLOC_CTX *frame = talloc_stackframe();
struct event_context *ev;
struct async_req *req;
NTSTATUS status;
ev = event_context_init(frame);
if (ev == NULL) {
status = NT_STATUS_NO_MEMORY;
goto fail;
}
req = rpc_cli_smbd_conn_init_send(frame, ev, stdout_callback, priv);
if (req == NULL) {
status = NT_STATUS_NO_MEMORY;
goto fail;
}
while (req->state < ASYNC_REQ_DONE) {
event_loop_once(ev);
}
status = rpc_cli_smbd_conn_init_recv(req, mem_ctx, pconn);
fail:
TALLOC_FREE(frame);
return status;
}
struct rpc_smbd_write_state {
struct rpc_cli_transport *sub_transp;
ssize_t written;
};
static void rpc_smbd_write_done(struct tevent_req *subreq);
static struct tevent_req *rpc_smbd_write_send(TALLOC_CTX *mem_ctx,
struct event_context *ev,
const uint8_t *data, size_t size,
void *priv)
{
struct rpc_transport_smbd_state *transp = talloc_get_type_abort(
priv, struct rpc_transport_smbd_state);
struct tevent_req *req, *subreq;
struct rpc_smbd_write_state *state;
req = tevent_req_create(mem_ctx, &state, struct rpc_smbd_write_state);
if (req == NULL) {
return NULL;
}
state->sub_transp = transp->sub_transp;
subreq = transp->sub_transp->write_send(state, ev, data, size,
transp->sub_transp->priv);
if (subreq == NULL) {
goto fail;
}
if (event_add_fd(ev, state, transp->conn->stdout_fd, EVENT_FD_READ,
rpc_cli_smbd_stdout_reader, transp->conn) == NULL) {
goto fail;
}
tevent_req_set_callback(subreq, rpc_smbd_write_done, req);
return req;
fail:
TALLOC_FREE(req);
return NULL;
}
static void rpc_smbd_write_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct rpc_smbd_write_state *state = tevent_req_data(
req, struct rpc_smbd_write_state);
NTSTATUS status;
status = state->sub_transp->write_recv(subreq, &state->written);
TALLOC_FREE(subreq);
if (!NT_STATUS_IS_OK(status)) {
tevent_req_nterror(req, status);
return;
}
tevent_req_done(req);
}
static NTSTATUS rpc_smbd_write_recv(struct tevent_req *req, ssize_t *pwritten)
{
struct rpc_smbd_write_state *state = tevent_req_data(
req, struct rpc_smbd_write_state);
NTSTATUS status;
if (tevent_req_is_nterror(req, &status)) {
return status;
}
*pwritten = state->written;
return NT_STATUS_OK;
}
struct rpc_smbd_read_state {
struct rpc_cli_transport *sub_transp;
ssize_t received;
};
static void rpc_smbd_read_done(struct tevent_req *subreq);
static struct tevent_req *rpc_smbd_read_send(TALLOC_CTX *mem_ctx,
struct event_context *ev,
uint8_t *data, size_t size,
void *priv)
{
struct rpc_transport_smbd_state *transp = talloc_get_type_abort(
priv, struct rpc_transport_smbd_state);
struct tevent_req *req, *subreq;
struct rpc_smbd_read_state *state;
req = tevent_req_create(mem_ctx, &state, struct rpc_smbd_read_state);
if (req == NULL) {
return NULL;
}
state->sub_transp = transp->sub_transp;
subreq = transp->sub_transp->read_send(state, ev, data, size,
transp->sub_transp->priv);
if (subreq == NULL) {
goto fail;
}
if (event_add_fd(ev, state, transp->conn->stdout_fd, EVENT_FD_READ,
rpc_cli_smbd_stdout_reader, transp->conn) == NULL) {
goto fail;
}
tevent_req_set_callback(subreq, rpc_smbd_read_done, req);
return req;
fail:
TALLOC_FREE(req);
return NULL;
}
static void rpc_smbd_read_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct rpc_smbd_read_state *state = tevent_req_data(
req, struct rpc_smbd_read_state);
NTSTATUS status;
status = state->sub_transp->read_recv(subreq, &state->received);
TALLOC_FREE(subreq);
if (!NT_STATUS_IS_OK(status)) {
tevent_req_nterror(req, status);
return;
}
tevent_req_done(req);
}
static NTSTATUS rpc_smbd_read_recv(struct tevent_req *req, ssize_t *preceived)
{
struct rpc_smbd_read_state *state = tevent_req_data(
req, struct rpc_smbd_read_state);
NTSTATUS status;
if (tevent_req_is_nterror(req, &status)) {
return status;
}
*preceived = state->received;
return NT_STATUS_OK;
}
struct rpc_transport_smbd_init_state {
struct rpc_cli_transport *transport;
struct rpc_transport_smbd_state *transport_smbd;
};
static void rpc_transport_smbd_init_done(struct async_req *subreq);
struct async_req *rpc_transport_smbd_init_send(TALLOC_CTX *mem_ctx,
struct event_context *ev,
struct rpc_cli_smbd_conn *conn,
const struct ndr_syntax_id *abstract_syntax)
{
struct async_req *result, *subreq;
struct rpc_transport_smbd_init_state *state;
if (!async_req_setup(mem_ctx, &result, &state,
struct rpc_transport_smbd_init_state)) {
return NULL;
}
state->transport = talloc(state, struct rpc_cli_transport);
if (state->transport == NULL) {
goto fail;
}
state->transport_smbd = talloc(state->transport,
struct rpc_transport_smbd_state);
if (state->transport_smbd == NULL) {
goto fail;
}
state->transport_smbd->conn = conn;
state->transport->priv = state->transport_smbd;
if (event_add_fd(ev, state, conn->stdout_fd, EVENT_FD_READ,
rpc_cli_smbd_stdout_reader, conn) == NULL) {
goto fail;
}
subreq = rpc_transport_np_init_send(state, ev, conn->cli,
abstract_syntax);
if (subreq == NULL) {
goto fail;
}
subreq->async.fn = rpc_transport_smbd_init_done;
subreq->async.priv = result;
return result;
fail:
TALLOC_FREE(result);
return NULL;
}
static void rpc_transport_smbd_init_done(struct async_req *subreq)
{
struct async_req *req = talloc_get_type_abort(
subreq->async.priv, struct async_req);
struct rpc_transport_smbd_init_state *state = talloc_get_type_abort(
req->private_data, struct rpc_transport_smbd_init_state);
NTSTATUS status;
status = rpc_transport_np_init_recv(
subreq, state->transport_smbd,
&state->transport_smbd->sub_transp);
TALLOC_FREE(subreq);
if (!NT_STATUS_IS_OK(status)) {
async_req_nterror(req, status);
return;
}
async_req_done(req);
}
NTSTATUS rpc_transport_smbd_init_recv(struct async_req *req,
TALLOC_CTX *mem_ctx,
struct rpc_cli_transport **presult)
{
struct rpc_transport_smbd_init_state *state = talloc_get_type_abort(
req->private_data, struct rpc_transport_smbd_init_state);
NTSTATUS status;
if (async_req_is_nterror(req, &status)) {
return status;
}
state->transport->write_send = rpc_smbd_write_send;
state->transport->write_recv = rpc_smbd_write_recv;
state->transport->read_send = rpc_smbd_read_send;
state->transport->read_recv = rpc_smbd_read_recv;
state->transport->trans_send = NULL;
state->transport->trans_recv = NULL;
*presult = talloc_move(mem_ctx, &state->transport);
return NT_STATUS_OK;
}
NTSTATUS rpc_transport_smbd_init(TALLOC_CTX *mem_ctx,
struct rpc_cli_smbd_conn *conn,
const struct ndr_syntax_id *abstract_syntax,
struct rpc_cli_transport **presult)
{
TALLOC_CTX *frame = talloc_stackframe();
struct event_context *ev;
struct async_req *req;
NTSTATUS status;
ev = event_context_init(frame);
if (ev == NULL) {
status = NT_STATUS_NO_MEMORY;
goto fail;
}
req = rpc_transport_smbd_init_send(frame, ev, conn, abstract_syntax);
if (req == NULL) {
status = NT_STATUS_NO_MEMORY;
goto fail;
}
while (req->state < ASYNC_REQ_DONE) {
event_loop_once(ev);
}
status = rpc_transport_smbd_init_recv(req, mem_ctx, presult);
fail:
TALLOC_FREE(frame);
return status;
}
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