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/*
A client based on unix domain socket
Copyright ( C ) Amitay Isaacs 2017
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 "replace.h"
# include "system/filesys.h"
# include "system/network.h"
# include <talloc.h>
# include <tevent.h>
# include "lib/util/debug.h"
# include "lib/util/time.h"
# include "lib/util/tevent_unix.h"
# include "common/logging.h"
# include "common/reqid.h"
# include "common/comm.h"
# include "common/sock_client.h"
struct sock_client_context {
struct sock_client_proto_funcs * funcs ;
void * private_data ;
void ( * disconnect_callback ) ( void * private_data ) ;
void * disconnect_data ;
int fd ;
struct comm_context * comm ;
struct reqid_context * idr ;
} ;
/*
* connect to a unix domain socket
*/
static int socket_connect ( const char * sockpath )
{
struct sockaddr_un addr ;
size_t len ;
int fd , ret ;
memset ( & addr , 0 , sizeof ( addr ) ) ;
addr . sun_family = AF_UNIX ;
len = strlcpy ( addr . sun_path , sockpath , sizeof ( addr . sun_path ) ) ;
if ( len > = sizeof ( addr . sun_path ) ) {
D_ERR ( " socket path too long: %s \n " , sockpath ) ;
return - 1 ;
}
fd = socket ( AF_UNIX , SOCK_STREAM , 0 ) ;
if ( fd = = - 1 ) {
D_ERR ( " socket create failed - %s \n " , sockpath ) ;
return - 1 ;
}
ret = connect ( fd , ( struct sockaddr * ) & addr , sizeof ( addr ) ) ;
if ( ret ! = 0 ) {
D_ERR ( " socket connect failed - %s \n " , sockpath ) ;
close ( fd ) ;
return - 1 ;
}
return fd ;
}
/*
* Socket client
*/
static int sock_client_context_destructor ( struct sock_client_context * sockc ) ;
static void sock_client_read_handler ( uint8_t * buf , size_t buflen ,
void * private_data ) ;
static void sock_client_dead_handler ( void * private_data ) ;
static void sock_client_msg_reply ( struct sock_client_context * sockc ,
uint8_t * buf , size_t buflen ) ;
int sock_client_setup ( TALLOC_CTX * mem_ctx , struct tevent_context * ev ,
const char * sockpath ,
struct sock_client_proto_funcs * funcs ,
void * private_data ,
struct sock_client_context * * result )
{
struct sock_client_context * sockc ;
int ret ;
if ( sockpath = = NULL ) {
return EINVAL ;
}
if ( funcs = = NULL | | funcs - > request_push = = NULL | |
funcs - > reply_pull = = NULL | | funcs - > reply_reqid = = NULL ) {
return EINVAL ;
}
sockc = talloc_zero ( mem_ctx , struct sock_client_context ) ;
if ( sockc = = NULL ) {
return ENOMEM ;
}
sockc - > funcs = funcs ;
sockc - > private_data = private_data ;
sockc - > fd = socket_connect ( sockpath ) ;
if ( sockc - > fd = = - 1 ) {
talloc_free ( sockc ) ;
return EIO ;
}
ret = comm_setup ( sockc , ev , sockc - > fd ,
sock_client_read_handler , sockc ,
sock_client_dead_handler , sockc ,
& sockc - > comm ) ;
if ( ret ! = 0 ) {
D_ERR ( " comm_setup() failed, ret=%d \n " , ret ) ;
close ( sockc - > fd ) ;
talloc_free ( sockc ) ;
return ret ;
}
ret = reqid_init ( sockc , INT_MAX - 200 , & sockc - > idr ) ;
if ( ret ! = 0 ) {
D_ERR ( " reqid_init() failed, ret=%d \n " , ret ) ;
close ( sockc - > fd ) ;
talloc_free ( sockc ) ;
return ret ;
}
talloc_set_destructor ( sockc , sock_client_context_destructor ) ;
* result = sockc ;
return 0 ;
}
static int sock_client_context_destructor ( struct sock_client_context * sockc )
{
TALLOC_FREE ( sockc - > comm ) ;
if ( sockc - > fd ! = - 1 ) {
close ( sockc - > fd ) ;
sockc - > fd = - 1 ;
}
return 0 ;
}
static void sock_client_read_handler ( uint8_t * buf , size_t buflen ,
void * private_data )
{
struct sock_client_context * sockc = talloc_get_type_abort (
private_data , struct sock_client_context ) ;
sock_client_msg_reply ( sockc , buf , buflen ) ;
}
static void sock_client_dead_handler ( void * private_data )
{
struct sock_client_context * sockc = talloc_get_type_abort (
private_data , struct sock_client_context ) ;
if ( sockc - > disconnect_callback ! = NULL ) {
sockc - > disconnect_callback ( sockc - > disconnect_data ) ;
talloc_free ( sockc ) ;
return ;
}
D_NOTICE ( " connection to daemon closed, exiting \n " ) ;
exit ( 1 ) ;
}
void sock_client_set_disconnect_callback ( struct sock_client_context * sockc ,
sock_client_callback_func_t callback ,
void * private_data )
{
sockc - > disconnect_callback = callback ;
sockc - > disconnect_data = private_data ;
}
struct sock_client_msg_state {
struct sock_client_context * sockc ;
uint32_t reqid ;
struct tevent_req * req ;
void * reply ;
} ;
static int sock_client_msg_state_destructor (
struct sock_client_msg_state * state ) ;
static void sock_client_msg_done ( struct tevent_req * subreq ) ;
struct tevent_req * sock_client_msg_send ( TALLOC_CTX * mem_ctx ,
struct tevent_context * ev ,
struct sock_client_context * sockc ,
struct timeval timeout ,
void * request )
{
struct tevent_req * req , * subreq ;
struct sock_client_msg_state * state ;
uint8_t * buf ;
size_t buflen ;
int ret ;
req = tevent_req_create ( mem_ctx , & state , struct sock_client_msg_state ) ;
if ( req = = NULL ) {
return NULL ;
}
state - > sockc = sockc ;
state - > reqid = reqid_new ( sockc - > idr , state ) ;
if ( state - > reqid = = REQID_INVALID ) {
talloc_free ( req ) ;
return NULL ;
}
state - > req = req ;
talloc_set_destructor ( state , sock_client_msg_state_destructor ) ;
ret = sockc - > funcs - > request_push ( request , state - > reqid , state ,
& buf , & buflen , sockc - > private_data ) ;
if ( ret ! = 0 ) {
tevent_req_error ( req , ret ) ;
return tevent_req_post ( req , ev ) ;
}
subreq = comm_write_send ( state , ev , sockc - > comm , buf , buflen ) ;
if ( tevent_req_nomem ( subreq , req ) ) {
return tevent_req_post ( req , ev ) ;
}
tevent_req_set_callback ( subreq , sock_client_msg_done , req ) ;
if ( ! timeval_is_zero ( & timeout ) ) {
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if ( ! tevent_req_set_endtime ( req , ev , timeout ) ) {
return tevent_req_post ( req , ev ) ;
}
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}
return req ;
}
static int sock_client_msg_state_destructor (
struct sock_client_msg_state * state )
{
reqid_remove ( state - > sockc - > idr , state - > reqid ) ;
return 0 ;
}
static void sock_client_msg_done ( struct tevent_req * subreq )
{
struct tevent_req * req = tevent_req_callback_data (
subreq , struct tevent_req ) ;
int ret ;
bool status ;
status = comm_write_recv ( subreq , & ret ) ;
TALLOC_FREE ( subreq ) ;
if ( ! status ) {
tevent_req_error ( req , ret ) ;
return ;
}
/* wait for the reply or timeout */
}
static void sock_client_msg_reply ( struct sock_client_context * sockc ,
uint8_t * buf , size_t buflen )
{
struct sock_client_msg_state * state ;
uint32_t reqid ;
int ret ;
ret = sockc - > funcs - > reply_reqid ( buf , buflen , & reqid ,
sockc - > private_data ) ;
if ( ret ! = 0 ) {
D_WARNING ( " Invalid packet received, ret=%d \n " , ret ) ;
return ;
}
state = reqid_find ( sockc - > idr , reqid , struct sock_client_msg_state ) ;
if ( state = = NULL ) {
return ;
}
if ( reqid ! = state - > reqid ) {
return ;
}
ret = sockc - > funcs - > reply_pull ( buf , buflen , state , & state - > reply ,
sockc - > private_data ) ;
if ( ret ! = 0 ) {
tevent_req_error ( state - > req , ret ) ;
return ;
}
tevent_req_done ( state - > req ) ;
}
bool sock_client_msg_recv ( struct tevent_req * req , int * perr ,
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TALLOC_CTX * mem_ctx , void * reply )
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{
struct sock_client_msg_state * state = tevent_req_data (
req , struct sock_client_msg_state ) ;
int ret ;
if ( tevent_req_is_unix_error ( req , & ret ) ) {
if ( perr ! = NULL ) {
* perr = ret ;
}
return false ;
}
if ( reply ! = NULL ) {
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* ( void * * ) reply = talloc_steal ( mem_ctx , state - > reply ) ;
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}
return true ;
}