smbd: Slightly simplify create_file_unixpath()

[Samba.git] / source3 / torture / test_messaging_fd_passing.c

/*
   Unix SMB/CIFS implementation.
   Test for fd passing with messaging

   Copyright (C) Michael Adam 2014

   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"
#include "torture/proto.h"
#include "lib/util/tevent_unix.h"
#include "messages.h"

/**
 * test fdpass1:
 *
 * Try to pass an fd to the sending process - fails.
 */
bool run_messaging_fdpass1(int dummy)
{
        struct tevent_context *ev = NULL;
        struct messaging_context *msg_ctx = NULL;
        bool retval = false;
        int pipe_fds[2];
        int pass_fds[1] = { 0 };
        int ret;
        NTSTATUS status;
        struct server_id dst;
        TALLOC_CTX *frame = talloc_stackframe();

        ev = samba_tevent_context_init(frame);
        if (ev == NULL) {
                fprintf(stderr, "tevent_context_init failed\n");
                goto fail;
        }
        msg_ctx = messaging_init(ev, ev);
        if (msg_ctx == NULL) {
                fprintf(stderr, "messaging_init failed\n");
                goto fail;
        }

        dst = messaging_server_id(msg_ctx);

        ret = pipe(pipe_fds);
        if (ret != 0) {
                perror("pipe failed");
                goto fail;
        }

        pass_fds[0] = pipe_fds[0];

        status = messaging_send_iov(msg_ctx, dst, MSG_PING, NULL, 0,
                                    pass_fds, 1);
        if (!NT_STATUS_EQUAL(status, NT_STATUS_OK)) {
                fprintf(stderr,
                        "messaging_send_iov gave: %s\n", nt_errstr(status));
                goto fail;
        }

        retval = true;

fail:
        TALLOC_FREE(frame);
        return retval;
}

/**
 * test fdpass2:
 *
 * - parent: create a child
 * - parent: create a two pipes in the parent: up and down
 * - parent: pass the up pipe's reading end and the down pipe's writing
 *   end to the child and close them
 * - parent: write a number into the up pipe's writing end
 * - child: read number from the passed reading fd (up)
 * - child: write the read number to the passed writing fd (down)
 * - parent: read number from the down pipe's reading end and compare with
 *   original number
 */

#define MSG_TORTURE_FDPASS2 0xF002

static bool fdpass2_filter(struct messaging_rec *rec, void *private_data)
{
        if (rec->msg_type != MSG_TORTURE_FDPASS2) {
                return false;
        }

        if (rec->num_fds != 2) {
                return false;
        }

        return true;
}

static bool fdpass2_child(int ready_fd)
{
        struct tevent_context *ev = NULL;
        struct messaging_context *msg_ctx = NULL;
        TALLOC_CTX *frame = talloc_stackframe();
        bool retval = false;
        uint8_t c = 1;
        struct tevent_req *subreq;
        int ret;
        ssize_t bytes;
        int up_fd, down_fd;
        struct messaging_rec *rec;
        bool ok;

        ev = samba_tevent_context_init(frame);
        if (ev == NULL) {
                fprintf(stderr, "child: tevent_context_init failed\n");
                goto done;
        }

        msg_ctx = messaging_init(ev, ev);
        if (msg_ctx == NULL) {
                fprintf(stderr, "child: messaging_init failed\n");
                goto done;
        }

        /* Tell the parent we are ready to receive mesages. */
        bytes = write(ready_fd, &c, 1);
        if (bytes != 1) {
                perror("child: failed to write to ready_fd");
                goto done;
        }

        subreq = messaging_filtered_read_send(frame, /* TALLOC_CTX */
                                              ev, msg_ctx,
                                              fdpass2_filter, NULL);
        if (subreq == NULL) {
                fprintf(stderr, "child: messaging_filtered_read_send failed\n");
                goto done;
        }

        ok = tevent_req_poll(subreq, ev);
        if (!ok) {
                fprintf(stderr, "child: tevent_req_poll failed\n");
                goto done;
        }

        ret = messaging_filtered_read_recv(subreq, frame, &rec);
        TALLOC_FREE(subreq);
        if (ret != 0) {
                fprintf(stderr, "child: messaging_filtered_read_recv failed\n");
                goto done;
        }

        SMB_ASSERT(rec->num_fds == 2);

        /* Tell the parent we are done. */
        bytes = write(ready_fd, &c, 1);
        if (bytes != 1) {
                perror("child: failed to write to ready_fd");
                goto done;
        }

        up_fd = rec->fds[0];
        down_fd = rec->fds[1];

        bytes = read(up_fd, &c, 1);
        if (bytes != 1) {
                perror("child: read from up_fd failed");
                goto done;
        }

        bytes = write(down_fd, &c, 1);
        if (bytes != 1) {
                perror("child: write to down_fd failed");
        }

        printf("child: done\n");

        retval = true;

done:
        TALLOC_FREE(frame);
        return retval;
}

struct child_done_state {
        int fd;
        bool done;
};

static void child_done_cb(struct tevent_context *ev,
                          struct tevent_fd *fde,
                          uint16_t flags,
                          void *private_data)
{
        struct child_done_state *state =
                        (struct child_done_state *)private_data;
        char c = 0;
        ssize_t bytes;

        bytes = read(state->fd, &c, 1);
        if (bytes != 1) {
                perror("parent: read from ready_fd failed");
        }

        state->done = true;
}

static bool fdpass2_parent(pid_t child_pid, int ready_fd, size_t payload_size)
{
        struct tevent_context *ev = NULL;
        struct messaging_context *msg_ctx = NULL;
        bool retval = false;
        int up_pipe[2];
        int down_pipe[2];
        int pass_fds[2] = { 0 };
        int ret;
        NTSTATUS status;
        struct server_id dst;
        TALLOC_CTX *frame = talloc_stackframe();
        uint8_t c1 = 1, c2, c;
        ssize_t bytes;
        struct iovec iov;
        DATA_BLOB blob;
        struct tevent_fd *child_done_fde;
        struct child_done_state child_state;

        ev = samba_tevent_context_init(frame);
        if (ev == NULL) {
                fprintf(stderr, "parent: tevent_context_init failed\n");
                goto done;
        }

        msg_ctx = messaging_init(ev, ev);
        if (msg_ctx == NULL) {
                fprintf(stderr, "parent: messaging_init failed\n");
                goto done;
        }

        /* wait util the child is ready to receive messages */
        bytes = read(ready_fd, &c, 1);
        if (bytes != 1) {
                perror("parent: read from ready_fd failed");
                goto done;
        }

        ret = pipe(up_pipe);
        if (ret != 0) {
                perror("parent: pipe failed for up_pipe");
                goto done;
        }

        ret = pipe(down_pipe);
        if (ret != 0) {
                perror("parent: pipe failed for down_pipe");
                goto done;
        }

        child_state.fd = ready_fd;
        child_state.done = false;

        child_done_fde = tevent_add_fd(ev, ev, ready_fd, TEVENT_FD_READ,
                                       child_done_cb, &child_state);
        if (child_done_fde == NULL) {
                fprintf(stderr,
                        "parent: failed tevent_add_fd for child done\n");
                goto done;
        }

        pass_fds[0] = up_pipe[0];
        pass_fds[1] = down_pipe[1];

        dst = messaging_server_id(msg_ctx);
        dst.pid = child_pid;

        /*
         * Send a certain payload with the fds, to test to test
         * that fd-passing works when we have fragmentation and
         * re-assembly of the datagrams.
         *
         * Fragmentation/queuing is triggered by a certain payload
         * size. Payloads below that size use the fast path.
         */
        blob = data_blob_talloc_zero(frame, payload_size);
        iov.iov_base = blob.data;
        iov.iov_len  = blob.length;

        status = messaging_send_iov(msg_ctx, dst, MSG_TORTURE_FDPASS2, &iov, 1,
                                    pass_fds, 2);
        if (!NT_STATUS_IS_OK(status)) {
                fprintf(stderr, "parent: messaging_send_iov failed: %s\n",
                        nt_errstr(status));
                goto done;
        }

        printf("parent: waiting for child to confirm\n");

        while (!child_state.done) {
                ret = tevent_loop_once(ev);
                if (ret != 0) {
                        fprintf(stderr, "parent: tevent_loop_once failed\n");
                        goto done;
                }
        }

        printf("parent: child confirmed\n");

        close(up_pipe[0]);
        close(down_pipe[1]);

        bytes = write(up_pipe[1], &c1, 1);
        if (bytes != 1) {
                perror("parent: write to up pipe failed");
                goto done;
        }

        bytes = read(down_pipe[0], &c2, 1);
        if (bytes != 1) {
                perror("parent: read from down pipe failed");
                goto done;
        }

        if (c1 != c2) {
                fprintf(stderr, "parent: c1[%d] != c2[%d]\n", c1, c2);
                goto done;
        }

        ret = waitpid(child_pid, NULL, 0);
        if (ret == -1) {
                perror("parent: waitpid failed");
                goto done;
        }

        retval = true;

done:
        TALLOC_FREE(frame);
        return retval;
}

static bool run_messaging_fdpass2_int(int dummy, size_t payload_size)
{
        bool retval = false;
        pid_t child_pid;
        int ready_pipe[2];
        int ret;

        ret = pipe(ready_pipe);
        if (ret != 0) {
                perror("parent: pipe failed for ready_pipe");
                return retval;
        }

        child_pid = fork();
        if (child_pid == -1) {
                perror("fork failed");
        } else if (child_pid == 0) {
                close(ready_pipe[0]);
                retval = fdpass2_child(ready_pipe[1]);
        } else {
                close(ready_pipe[1]);
                retval = fdpass2_parent(child_pid, ready_pipe[0], payload_size);
        }

        return retval;
}

bool run_messaging_fdpass2(int dummy)
{
        return run_messaging_fdpass2_int(dummy, 1000*1000);
}

/**
 * Variant of the FDPASS2 test that tests the non-queuing fast path
 * with a small payload.
 */
bool run_messaging_fdpass2a(int dummy)
{
        return run_messaging_fdpass2_int(dummy, 1);
}

/**
 * Variant of the FDPASS2 test that tests the non-queuing fast path
 * without a payload.
 */
bool run_messaging_fdpass2b(int dummy)
{
        return run_messaging_fdpass2_int(dummy, 0);
}