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/*
SSSD
Common helper functions to be used in child processes
Authors:
Sumit Bose <sbose@redhat.com>
Copyright (C) 2009 Red Hat
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 <sys/types.h>
#include <fcntl.h>
#include <tevent.h>
#include <sys/wait.h>
#include "util/util.h"
#include "util/find_uid.h"
#include "db/sysdb.h"
#include "providers/child_common.h"
uint8_t *copy_buffer_and_add_zero(TALLOC_CTX *mem_ctx,
const uint8_t *src, size_t len)
{
uint8_t *str;
str = talloc_size(mem_ctx, len + 1);
if (str == NULL) {
DEBUG(1, ("talloc_size failed.\n"));
return NULL;
}
memcpy(str, src, len);
str[len] = '\0';
return str;
}
/* Async communication with the child process via a pipe */
struct read_pipe_state {
int fd;
uint8_t *buf;
size_t len;
};
static void read_pipe_done(struct tevent_context *ev,
struct tevent_fd *fde,
uint16_t flags, void *pvt);
struct tevent_req *read_pipe_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev, int fd)
{
struct tevent_req *req;
struct read_pipe_state *state;
struct tevent_fd *fde;
req = tevent_req_create(mem_ctx, &state, struct read_pipe_state);
if (req == NULL) return NULL;
state->fd = fd;
state->buf = talloc_array(state, uint8_t, MAX_CHILD_MSG_SIZE);
state->len = 0;
if (state->buf == NULL) goto fail;
fde = tevent_add_fd(ev, state, fd, TEVENT_FD_READ,
read_pipe_done, req);
if (fde == NULL) {
DEBUG(1, ("tevent_add_fd failed.\n"));
goto fail;
}
return req;
fail:
talloc_zfree(req);
return NULL;
}
static void read_pipe_done(struct tevent_context *ev,
struct tevent_fd *fde,
uint16_t flags, void *pvt)
{
ssize_t size;
struct tevent_req *req = talloc_get_type(pvt, struct tevent_req);
struct read_pipe_state *state = tevent_req_data(req, struct read_pipe_state);
if (flags & TEVENT_FD_WRITE) {
DEBUG(1, ("read_pipe_done called with TEVENT_FD_WRITE, this should not happen.\n"));
tevent_req_error(req, EINVAL);
return;
}
size = read(state->fd, state->buf + state->len, talloc_get_size(state->buf) - state->len);
if (size == -1) {
if (errno == EAGAIN || errno == EINTR) return;
DEBUG(1, ("read failed [%d][%s].\n", errno, strerror(errno)));
tevent_req_error(req, errno);
return;
} else if (size > 0) {
state->len += size;
if (state->len > talloc_get_size(state->buf)) {
DEBUG(1, ("read to much, this should never happen.\n"));
tevent_req_error(req, EINVAL);
return;
}
return;
} else if (size == 0) {
tevent_req_done(req);
return;
} else {
DEBUG(1, ("unexpected return value of read [%d].\n", size));
tevent_req_error(req, EINVAL);
return;
}
}
int read_pipe_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
uint8_t **buf, ssize_t *len)
{
struct read_pipe_state *state = tevent_req_data(req,
struct read_pipe_state);
TEVENT_REQ_RETURN_ON_ERROR(req);
*buf = talloc_move(mem_ctx, &state->buf);
*len = state->len;
return EOK;
}
/* The pipes to communicate with the child must be nonblocking */
void fd_nonblocking(int fd)
{
int flags;
int ret;
flags = fcntl(fd, F_GETFL, 0);
if (flags == -1) {
ret = errno;
DEBUG(1, ("F_GETFL failed [%d][%s].\n", ret, strerror(ret)));
return;
}
if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1) {
ret = errno;
DEBUG(1, ("F_SETFL failed [%d][%s].\n", ret, strerror(ret)));
}
return;
}
void child_sig_handler(struct tevent_context *ev,
struct tevent_signal *sige, int signum,
int count, void *__siginfo, void *pvt)
{
int ret;
int child_status;
DEBUG(7, ("Waiting for [%d] childeren.\n", count));
do {
errno = 0;
ret = waitpid(-1, &child_status, WNOHANG);
if (ret == -1) {
DEBUG(1, ("waitpid failed [%d][%s].\n", errno, strerror(errno)));
} else if (ret == 0) {
DEBUG(1, ("waitpid did not found a child with changed status.\n"));
} else {
if (WEXITSTATUS(child_status) != 0) {
DEBUG(1, ("child [%d] failed with status [%d].\n", ret,
child_status));
} else {
DEBUG(4, ("child [%d] finished successful.\n", ret));
}
}
--count;
} while (count < 0);
return;
}
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