cnid_metad.c File Reference

cnid_dbd metadaemon to start up cnid_dbd upon request from afpd. More...

#include <unistd.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/param.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/un.h>
#include <sys/wait.h>
#include <time.h>
#include <bstrlib.h>
#include <pwd.h>
#include <grp.h>
#include <atalk/util.h>
#include <atalk/logger.h>
#include <atalk/cnid_bdb_private.h>
#include <atalk/compat.h>
#include <atalk/errchk.h>
#include <atalk/iniparser_util.h>
#include <atalk/netatalk_conf.h>
#include <atalk/volume.h>
#include "usockfd.h"

Data Structures
struct	server

Macros
#define	WEXITSTATUS(stat_val)   ((unsigned)(stat_val) >> 8)
#define	WIFEXITED(stat_val)   (((stat_val) & 255) == 0)
#define	WIFSTOPPED(status)   (((status) & 0xff) == 0x7f)
#define	WIFSIGNALED(status)   (!WIFSTOPPED(status) && !WIFEXITED(status))
#define	WTERMSIG(status)   ((status) & 0x7f)
#define	SWITCH_TO_GID(gid)   ((setegid(gid) < 0 || setgid(gid) < 0) ? -1 : 0)
#define	SWITCH_TO_UID(uid)   ((setuid(uid) < 0 || seteuid(uid) < 0 || setuid(uid) < 0) ? -1 : 0)
#define	DBHOME   ".AppleDB"
#define	DBHOMELEN   8
#define	MAXSPAWN   3
#define	TESTTIME   10
#define	MAXVOLS   4096
#define	DEFAULTHOST   "localhost"
#define	DEFAULTPORT   "4700"

Functions
static void	daemon_exit (int i)
static void	sig_handler (int sig)
static struct server *	test_usockfn (const char *path)
int	maybe_start_dbd (const AFPObj *obj, char *dbdpn, const char *volpath, const char *username)
	Pass connection request to existing cnid_dbd process or start a new one.
static int	set_dbdir (const char *dbdir, const char *vpath)
static void	catch_child (int sig)
static void	set_signal (void)
static int	setlimits (void)
static uid_t	uid_from_name (const char *name)
int	main (int argc, char *argv[])

Variables
static int	srvfd
static int	rqstfd
static volatile sig_atomic_t	sigchild = 0
static uint	maxvol
static struct server	srv [MAXVOLS]

Detailed Description

cnid_dbd metadaemon to start up cnid_dbd upon request from afpd.

Here is how it works:

                    via TCP socket
1.       afpd          ------->        cnid_metad
 
                via UNIX domain socket
2.   cnid_metad        ------->         cnid_dbd
 
                 passes afpd client fd
3.   cnid_metad        ------->         cnid_dbd
 
Result:
                    via TCP socket
4.       afpd          ------->         cnid_dbd

cnid_metad and cnid_dbd have been converted to non-blocking IO in 2010.

Macro Definition Documentation

DBHOME

#define DBHOME   ".AppleDB"

DBHOMELEN

#define DBHOMELEN   8

DEFAULTHOST

#define DEFAULTHOST   "localhost"

DEFAULTPORT

#define DEFAULTPORT   "4700"

MAXSPAWN

#define MAXSPAWN   3

Max times respawned in..

MAXVOLS

#define MAXVOLS   4096

SWITCH_TO_GID

#define SWITCH_TO_GID

(

gid

)

((setegid(gid) < 0 || setgid(gid) < 0) ? -1 : 0)

SWITCH_TO_UID

#define SWITCH_TO_UID

(

uid

)

((setuid(uid) < 0 || seteuid(uid) < 0 || setuid(uid) < 0) ? -1 : 0)

TESTTIME

#define TESTTIME   10

this much seconds apfd client tries to to reconnect every 5 secondes, catch it

WEXITSTATUS

#define WEXITSTATUS

(

stat_val

)

((unsigned)(stat_val) >> 8)

WIFEXITED

#define WIFEXITED

(

stat_val

)

(((stat_val) & 255) == 0)

WIFSIGNALED

#define WIFSIGNALED

(

status

)

(!WIFSTOPPED(status) && !WIFEXITED(status))

WIFSTOPPED

#define WIFSTOPPED

(

status

)

(((status) & 0xff) == 0x7f)

WTERMSIG

#define WTERMSIG

(

status

)

((status) & 0x7f)

Function Documentation

catch_child()

static void catch_child ( int  sig )

static

daemon_exit()

static void daemon_exit ( int  i )

static

main()

int main	(	int	argc,
		char *	argv[]
	)

maybe_start_dbd()

int maybe_start_dbd	(	const AFPObj *	obj,
		char *	dbdpn,
		const char *	volpath,
		const char *	username
	)

Pass connection request to existing cnid_dbd process or start a new one.

Parameters

[in]	obj	handle
[in]	dbdpn	Path to cnid_dbd binary
[in]	volpath	Path of AFP volume
[in]	username	Optional username, may be NULL

Returns

0 on success, -1 on error

set_dbdir()

static int set_dbdir ( const char *  dbdir, const char *  vpath  )

static

set_signal()

static void set_signal ( void  )

static

setlimits()

static int setlimits ( void  )

static

sig_handler()

static void sig_handler ( int  sig )

static

test_usockfn()

static struct server * test_usockfn ( const char *  path )

static

uid_from_name()

static uid_t uid_from_name ( const char *  name )

static

Variable Documentation

maxvol

uint maxvol

static

rqstfd

int rqstfd

static

sigchild

volatile sig_atomic_t sigchild = 0

static

srv

struct server srv[MAXVOLS]

static

srvfd

int srvfd

static