shadow/lib/nscd.c

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/* Copyright (c) 1999 SuSE GmbH Nuerenberg, Germany
Author: Thorsten Kukuk <kukuk@suse.de> */
#include <assert.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/un.h>
/* Version number of the daemon interface */
#define NSCD_VERSION 2
/* Path for the Unix domain socket. */
#define _PATH_NSCDSOCKET "/var/run/nscd/socket"
#define _PATH_NSCDSOCKET_OLD "/var/run/.nscd_socket"
/* Available services. */
typedef enum {
GETPWBYNAME,
GETPWBYUID,
GETGRBYNAME,
GETGRBYGID,
GETHOSTBYNAME,
GETHOSTBYNAMEv6,
GETHOSTBYADDR,
GETHOSTBYADDRv6,
LASTDBREQ = GETHOSTBYADDRv6,
SHUTDOWN, /* Shut the server down. */
GETSTAT, /* Get the server statistic. */
INVALIDATE, /* Invalidate one special cache. */
LASTREQ
} request_type;
/* Header common to all requests */
typedef struct {
int version; /* Version number of the daemon interface. */
request_type type; /* Service requested. */
#if defined(__alpha__)
int64_t key_len; /* Key length is 64bit on Alpha. */
#else
int32_t key_len; /* Key length, 32bit on most plattforms. */
#endif
} request_header;
/* Create a socket connected to a name. */
static int nscd_open_socket (void)
{
struct sockaddr_un addr;
int sock;
sock = socket (PF_UNIX, SOCK_STREAM, 0);
if (sock < 0)
return -1;
addr.sun_family = AF_UNIX;
assert (sizeof (addr.sun_path) >= sizeof (_PATH_NSCDSOCKET));
strcpy (addr.sun_path, _PATH_NSCDSOCKET);
if (connect (sock, (struct sockaddr *) &addr, sizeof (addr)) < 0) {
addr.sun_family = AF_UNIX;
assert (sizeof (addr.sun_path) >=
sizeof (_PATH_NSCDSOCKET_OLD));
strcpy (addr.sun_path, _PATH_NSCDSOCKET_OLD);
if (connect (sock, (struct sockaddr *) &addr, sizeof (addr)) <
0) {
close (sock);
return -1;
}
}
return sock;
}
/*
* nscd_flush_cache - flush specyfied service bufor in nscd cache
*/
int nscd_flush_cache (char *service)
{
int sock = nscd_open_socket ();
request_header req;
struct iovec iov[2];
ssize_t nbytes;
if (sock == -1)
return -1;
req.version = NSCD_VERSION;
req.type = INVALIDATE;
req.key_len = strlen (service) + 1;
iov[0].iov_base = &req;
iov[0].iov_len = sizeof (req);
iov[1].iov_base = service;
iov[1].iov_len = req.key_len;
nbytes = writev (sock, iov, 2);
close (sock);
return (nbytes != iov[0].iov_len + iov[1].iov_len ? (-1) : 0);
}