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/*
SSSD
NSS Responder
Copyright (C) Simo Sorce <ssorce@redhat.com> 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 <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <string.h>
#include <sys/time.h>
#include <errno.h>
#include "talloc.h"
#include "events.h"
#include "util/util.h"
#include "service.h"
#include "nss/nsssrv.h"
static void set_nonblocking(int fd)
{
unsigned v;
v = fcntl(fd, F_GETFL, 0);
fcntl(fd, F_SETFL, v | O_NONBLOCK);
}
static void set_close_on_exec(int fd)
{
unsigned v;
v = fcntl(fd, F_GETFD, 0);
fcntl(fd, F_SETFD, v | FD_CLOEXEC);
}
static int client_destructor(struct cli_ctx *ctx)
{
if (ctx->cfd > 0) close(ctx->cfd);
return 0;
}
static void client_send(struct event_context *ev, struct cli_ctx *cctx)
{
int ret;
ret = nss_packet_send(cctx->creq->out, cctx->cfd);
if (ret == RES_RETRY) {
/* not all data was sent, loop again */
return;
}
if (ret != RES_SUCCESS) {
DEBUG(0, ("Failed to read request, aborting client!\n"));
talloc_free(cctx);
return;
}
/* ok all sent */
EVENT_FD_NOT_WRITEABLE(cctx->cfde);
EVENT_FD_READABLE(cctx->cfde);
talloc_free(cctx->creq);
cctx->creq = NULL;
return;
}
static void client_recv(struct event_context *ev, struct cli_ctx *cctx)
{
int ret;
if (!cctx->creq) {
cctx->creq = talloc_zero(cctx, struct cli_request);
if (!cctx->creq) {
DEBUG(0, ("Failed to alloc request, aborting client!\n"));
talloc_free(cctx);
return;
}
}
if (!cctx->creq->in) {
ret = nss_packet_new(cctx->creq, 0, 0, &cctx->creq->in);
if (ret != RES_SUCCESS) {
DEBUG(0, ("Failed to alloc request, aborting client!\n"));
talloc_free(cctx);
return;
}
}
ret = nss_packet_recv(cctx->creq->in, cctx->cfd);
switch (ret) {
case RES_SUCCESS:
/* do not read anymore */
EVENT_FD_NOT_READABLE(cctx->cfde);
/* execute command */
ret = nss_cmd_execute(ev, cctx);
if (ret != RES_SUCCESS) {
DEBUG(0, ("Failed to execute request, aborting client!\n"));
talloc_free(cctx);
}
break;
case RES_RETRY:
/* need to read still some data, loop again */
break;
default:
DEBUG(0, ("Failed to read request, aborting client!\n"));
talloc_free(cctx);
}
return;
}
static void client_fd_handler(struct event_context *ev,
struct fd_event *fde,
uint16_t flags, void *ptr)
{
struct cli_ctx *cctx = talloc_get_type(ptr, struct cli_ctx);
if (flags & EVENT_FD_READ) {
client_recv(ev, cctx);
return;
}
if (flags & EVENT_FD_WRITE) {
client_send(ev, cctx);
return;
}
}
static void accept_fd_handler(struct event_context *ev,
struct fd_event *fde,
uint16_t flags, void *ptr)
{
/* accept and attach new event handler */
struct nss_ctx *nctx = talloc_get_type(ptr, struct nss_ctx);
struct cli_ctx *cctx;
socklen_t len;
cctx = talloc_zero(nctx, struct cli_ctx);
if (!cctx) {
struct sockaddr_un addr;
int fd;
DEBUG(0, ("Out of memory trying to setup client context!\n"));
/* accept and close to signal the client we have a problem */
memset(&addr, 0, sizeof(addr));
len = sizeof(addr);
fd = accept(nctx->lfd, (struct sockaddr *)&addr, &len);
if (fd == -1) {
return;
}
close(fd);
return;
}
len = sizeof(cctx->addr);
cctx->cfd = accept(nctx->lfd, (struct sockaddr *)&cctx->addr, &len);
if (cctx->cfd == -1) {
DEBUG(0, ("Accept failed [%s]", strerror(errno)));
talloc_free(cctx);
return;
}
cctx->cfde = event_add_fd(ev, cctx, cctx->cfd,
EVENT_FD_READ, client_fd_handler, cctx);
if (!cctx->cfde) {
close(cctx->cfd);
talloc_free(cctx);
DEBUG(0, ("Failed to queue client handler\n"));
}
talloc_set_destructor(cctx, client_destructor);
DEBUG(2, ("Client connected!\n"));
return;
}
/* create a unix socket and listen to it */
static void set_unix_socket(struct event_context *ev,
struct nss_ctx *nctx,
const char *sock_name)
{
struct sockaddr_un addr;
/* make sure we have no old sockets around */
unlink(sock_name);
nctx->lfd = socket(AF_UNIX, SOCK_STREAM, 0);
if (nctx->lfd == -1) {
return;
}
set_nonblocking(nctx->lfd);
set_close_on_exec(nctx->lfd);
memset(&addr, 0, sizeof(addr));
addr.sun_family = AF_UNIX;
strncpy(addr.sun_path, sock_name, sizeof(addr.sun_path));
if (bind(nctx->lfd, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
DEBUG(0,("Unable to bind on socket '%s'\n", sock_name));
goto failed;
}
if (listen(nctx->lfd, 10) != 0) {
DEBUG(0,("Unable to listen on socket '%s'\n", sock_name));
goto failed;
}
nctx->lfde = event_add_fd(ev, nctx, nctx->lfd,
EVENT_FD_READ, accept_fd_handler, nctx);
return;
failed:
close(nctx->lfd);
}
void nss_task_init(struct task_server *task)
{
struct nss_ctx *nctx;
task_server_set_title(task, "sssd[nsssrv]");
nctx = talloc_zero(task, struct nss_ctx);
if (!nctx) {
task_server_terminate(task, "fatal error initializing nss_ctx\n");
return;
}
nctx->task = task;
set_unix_socket(task->event_ctx, nctx, SSS_NSS_SOCKET_NAME);
}
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