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/*
nslcd-server.c - server socket routines
Copyright (C) 2006 West Consulting
Copyright (C) 2006 Arthur de Jong
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
MA 02110-1301 USA
*/
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <malloc.h>
#include <stdio.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <errno.h>
#include <fcntl.h>
/* temp added for ldap requests */
#include <pwd.h>
#include <ldap.h>
#include "ldap-nss.h"
#include "nslcd-server.h"
#include "log.h"
/* returns a socket ready to answer requests from the client,
return <0 on error */
int nslcd_server_open(void)
{
int sock;
/*int flag;*/
struct sockaddr_un addr;
/* create a socket */
if ( (sock=socket(PF_UNIX,SOCK_STREAM,0))<0 )
{
log_log(LOG_ERR,"cannot create socket: %s",strerror(errno));
exit(1);
}
/* create socket address structure */
addr.sun_family=AF_UNIX;
strcpy(addr.sun_path,NSLCD_SOCKET);
/* unlink to socket */
if (unlink(NSLCD_SOCKET)<0)
{
log_log(LOG_DEBUG,"unlink() of "NSLCD_SOCKET" failed (ignored): %s",
strerror(errno));
}
/* bind to the socket */
if (bind(sock,(struct sockaddr *)&addr,sizeof(struct sockaddr_un))<0)
{
log_log(LOG_ERR,"bind() to "NSLCD_SOCKET" failed: %s",
strerror(errno));
if (close(sock))
log_log(LOG_WARNING,"problem closing socket: %s",strerror(errno));
exit(1);
}
#ifdef NONBLOCKING
/* we are going to block for now and implement threading later on */
/* do not block on accept() */
if ((flag=fcntl(sock,F_GETFL,0))<0)
{
log_log(LOG_ERR,"fctnl(F_GETFL) failed: %s",strerror(errno));
if (close(sock))
log_log(LOG_WARNING,"problem closing socket: %s",strerror(errno));
exit(1);
}
if (fcntl(sock,F_SETFL,flag|O_NONBLOCK)<0)
{
log_log(LOG_ERR,"fctnl(F_SETFL,O_NONBLOCK) failed: %s",strerror(errno));
if (close(sock))
log_log(LOG_WARNING,"problem closing socket: %s",strerror(errno));
exit(1);
}
#endif /* NONBLOCKING */
/* close the file descriptor on exit */
if (fcntl(sock,F_SETFD,FD_CLOEXEC)<0)
{
log_log(LOG_ERR,"fctnl(F_SETFL,O_NONBLOCK) failed: %s",strerror(errno));
if (close(sock))
log_log(LOG_WARNING,"problem closing socket: %s",strerror(errno));
exit(1);
}
#ifdef DONT_FOR_NOW
/* Set permissions for the socket. */
chmod (_PATH_NSCDSOCKET, DEFFILEMODE);
#endif /* DONT_FOR_NOW */
/* start listening for connections */
if (listen(sock,SOMAXCONN)<0)
{
log_log(LOG_ERR,"listen() failed: %s",strerror(errno));
if (close(sock))
log_log(LOG_WARNING,"problem closing socket: %s",strerror(errno));
exit(1);
}
/* we're done */
return sock;
}
/* FIXME: the following write can fail with EINTR */
/* helper marco for writes, bails out on any write problems */
#define WRITE(sock, buf, count) \
if (write(sock, buf, count) < (count)) \
{ close(sock); return -1; }
/* helper macro for writing 32-bit integer values, uses tmpint32 as
temporary value (should be defined by caller) */
#define WRITE_INT32(sock, i) \
tmpint32 = (int32_t)(i); \
WRITE(sock, &tmpint32, sizeof(int32_t))
/* FIXME: the following read can fail with EINTR */
#define READ(sock, buf, count) \
if (read(sock, buf, count) < (count)) \
{ close(sock); return -1; }
/* helper macro for writing 32-bit integer values, uses tmpint32 as
temporary value (should be defined by caller) */
#define READ_INT32(sock, i) \
READ(sock, &tmpint32, sizeof(int32_t)); \
i = tmpint32;
/* temp decl here */
enum nss_status
_nss_ldap_parse_pw (LDAPMessage * e,
struct ldap_state * pvt,
void *result, char *buffer, size_t buflen);
/* handle a connection */
static int nslcd_server_handlerequest(int type, char *key)
{
struct passwd result;
enum nss_status s;
char buffer[1024];
int errnop;
struct ldap_args args;
printf("request id=%d key=%s\n", (int)type, key);
switch (type)
{
case NSLCD_RT_GETPWBYNAME:
LA_INIT(args);
LA_STRING(args) = key;
LA_TYPE(args) = LA_TYPE_STRING;
s=_nss_ldap_getbyname(&args,&result,buffer,1024,&errnop,_nss_ldap_filt_getpwnam,LM_PASSWD,_nss_ldap_parse_pw);
/* TODO: print s, result and buffer */
break;
default:
return -1;
}
return 0; /* success */
}
/* read a request message, returns <0 in case of errors,
on errors, socket is closed by callee */
int nslcd_server_readrequest(int sock)
{
int32_t tmpint32, tmp2, type;
size_t count;
char *key;
READ_INT32(sock, tmp2);
if (tmp2 != NSLCD_VERSION)
return -1; /* FIXME: report protocol error */
READ_INT32(sock, type);
READ_INT32(sock, count);
key = (char *)malloc(count+1);
if (key == NULL)
return -1; /* FIXME: report memory allocation errors */
READ(sock, key, count);
key[count]=0;
READ_INT32(sock, tmp2);
if (tmp2 != NSLCD_MAGIC)
return -1; /* FIXME: report protocol error */
/* pass the request to the request handler */
return nslcd_server_handlerequest(type, key);
}
/* read a response message */
int nslcd_client_writeresponse(int sock, void *buf)
{
/* TODO: validate */
return -1; /* not implemented */
}
/* probably use fwrite and fiends */
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