[rsync/rsync.git] / socket.c

/* 
   Copyright (C) Andrew Tridgell 1998
   
   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 2 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, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/*
  socket functions used in rsync 

  */

#include "rsync.h"

/* open a socket to a tcp remote host with the specified port 
   based on code from Warren */
int open_socket_out(char *host, int port)
{
	int type = SOCK_STREAM;
	struct sockaddr_in sock_out;
	int res;
	struct hostent *hp;
  

	res = socket(PF_INET, type, 0);
	if (res == -1) {
		return -1;
	}

	hp = gethostbyname(host);
	if (!hp) {
		rprintf(FERROR,"unknown host: %s\n", host);
		return -1;
	}

	memcpy(&sock_out.sin_addr, hp->h_addr, hp->h_length);
	sock_out.sin_port = htons(port);
	sock_out.sin_family = PF_INET;

	if (connect(res,(struct sockaddr *)&sock_out,sizeof(sock_out))) {
		close(res);
		rprintf(FERROR,"failed to connect to %s - %s\n", host, strerror(errno));
		return -1;
	}

	set_nonblocking(res);

	return res;
}


/****************************************************************************
open a socket of the specified type, port and address for incoming data
****************************************************************************/
static int open_socket_in(int type, int port)
{
	struct hostent *hp;
	struct sockaddr_in sock;
	char host_name[200];
	int res;
	int one=1;

	/* get my host name */
	if (gethostname(host_name, sizeof(host_name)) == -1) { 
		rprintf(FERROR,"gethostname failed\n"); 
		return -1; 
	} 

	/* get host info */
	if ((hp = gethostbyname(host_name)) == 0) {
		rprintf(FERROR,"gethostbyname: Unknown host %s\n",host_name);
		return -1;
	}
  
	memset((char *)&sock,0,sizeof(sock));
	memcpy((char *)&sock.sin_addr,(char *)hp->h_addr, hp->h_length);
	sock.sin_port = htons(port);
	sock.sin_family = hp->h_addrtype;
	sock.sin_addr.s_addr = INADDR_ANY;
	res = socket(hp->h_addrtype, type, 0);
	if (res == -1) { 
		rprintf(FERROR,"socket failed\n"); 
		return -1; 
	}

	setsockopt(res,SOL_SOCKET,SO_REUSEADDR,(char *)&one,sizeof(one));

	/* now we've got a socket - we need to bind it */
	if (bind(res, (struct sockaddr * ) &sock,sizeof(sock)) == -1) { 
		rprintf(FERROR,"bind failed on port %d\n", port);
		close(res); 
		return -1;
	}

	return res;
}


/****************************************************************************
determine if a file descriptor is in fact a socket
****************************************************************************/
int is_a_socket(int fd)
{
	int v,l;
	l = sizeof(int);
	return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
}


void start_accept_loop(int port, int (*fn)(int ))
{
	int s;

	/* open an incoming socket */
	s = open_socket_in(SOCK_STREAM, port);
	if (s == -1)
		exit_cleanup(RERR_SOCKETIO);

	/* ready to listen */
	if (listen(s, 5) == -1) {
		close(s);
		exit_cleanup(RERR_SOCKETIO);
	}


	/* now accept incoming connections - forking a new process
	   for each incoming connection */
	while (1) {
		fd_set fds;
		int fd;
		struct sockaddr addr;
		int in_addrlen = sizeof(addr);

		FD_ZERO(&fds);
		FD_SET(s, &fds);

		if (select(s+1, &fds, NULL, NULL, NULL) != 1) {
			continue;
		}

		if(!FD_ISSET(s, &fds)) continue;

		fd = accept(s,&addr,&in_addrlen);

		if (fd == -1) continue;

		signal(SIGCHLD, SIG_IGN);

		/* we shouldn't have any children left hanging around
		   but I have had reports that on Digital Unix zombies
		   are produced, so this ensures that they are reaped */
#ifdef WNOHANG
		waitpid(-1, NULL, WNOHANG);
#endif

		if (fork()==0) {
			close(s);

			set_nonblocking(fd);

			_exit(fn(fd));
		}

		close(fd);
	}
}


enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON};

struct
{
  char *name;
  int level;
  int option;
  int value;
  int opttype;
} socket_options[] = {
  {"SO_KEEPALIVE",      SOL_SOCKET,    SO_KEEPALIVE,    0,                 OPT_BOOL},
  {"SO_REUSEADDR",      SOL_SOCKET,    SO_REUSEADDR,    0,                 OPT_BOOL},
  {"SO_BROADCAST",      SOL_SOCKET,    SO_BROADCAST,    0,                 OPT_BOOL},
#ifdef TCP_NODELAY
  {"TCP_NODELAY",       IPPROTO_TCP,   TCP_NODELAY,     0,                 OPT_BOOL},
#endif
#ifdef IPTOS_LOWDELAY
  {"IPTOS_LOWDELAY",    IPPROTO_IP,    IP_TOS,          IPTOS_LOWDELAY,    OPT_ON},
#endif
#ifdef IPTOS_THROUGHPUT
  {"IPTOS_THROUGHPUT",  IPPROTO_IP,    IP_TOS,          IPTOS_THROUGHPUT,  OPT_ON},
#endif
#ifdef SO_SNDBUF
  {"SO_SNDBUF",         SOL_SOCKET,    SO_SNDBUF,       0,                 OPT_INT},
#endif
#ifdef SO_RCVBUF
  {"SO_RCVBUF",         SOL_SOCKET,    SO_RCVBUF,       0,                 OPT_INT},
#endif
#ifdef SO_SNDLOWAT
  {"SO_SNDLOWAT",       SOL_SOCKET,    SO_SNDLOWAT,     0,                 OPT_INT},
#endif
#ifdef SO_RCVLOWAT
  {"SO_RCVLOWAT",       SOL_SOCKET,    SO_RCVLOWAT,     0,                 OPT_INT},
#endif
#ifdef SO_SNDTIMEO
  {"SO_SNDTIMEO",       SOL_SOCKET,    SO_SNDTIMEO,     0,                 OPT_INT},
#endif
#ifdef SO_RCVTIMEO
  {"SO_RCVTIMEO",       SOL_SOCKET,    SO_RCVTIMEO,     0,                 OPT_INT},
#endif
  {NULL,0,0,0,0}};

	
/****************************************************************************
set user socket options
****************************************************************************/
void set_socket_options(int fd, char *options)
{
	char *tok;
	if (!options || !*options) return;

	options = strdup(options);
	
	if (!options) out_of_memory("set_socket_options");

	for (tok=strtok(options, " \t,"); tok; tok=strtok(NULL," \t,")) {
		int ret=0,i;
		int value = 1;
		char *p;
		int got_value = 0;

		if ((p = strchr(tok,'='))) {
			*p = 0;
			value = atoi(p+1);
			got_value = 1;
		}

		for (i=0;socket_options[i].name;i++)
			if (strcmp(socket_options[i].name,tok)==0)
				break;

		if (!socket_options[i].name) {
			rprintf(FERROR,"Unknown socket option %s\n",tok);
			continue;
		}

		switch (socket_options[i].opttype) {
		case OPT_BOOL:
		case OPT_INT:
			ret = setsockopt(fd,socket_options[i].level,
					 socket_options[i].option,(char *)&value,sizeof(int));
			break;
			
		case OPT_ON:
			if (got_value)
				rprintf(FERROR,"syntax error - %s does not take a value\n",tok);

			{
				int on = socket_options[i].value;
				ret = setsockopt(fd,socket_options[i].level,
						 socket_options[i].option,(char *)&on,sizeof(int));
			}
			break;	  
		}
		
		if (ret != 0)
			rprintf(FERROR,"Failed to set socket option %s\n",tok);
	}

	free(options);
}

/****************************************************************************
become a daemon, discarding the controlling terminal
****************************************************************************/
void become_daemon(void)
{
	int i;

	if (fork()) {
		_exit(0);
	}

	/* detach from the terminal */
#ifdef HAVE_SETSID
	setsid();
#else
#ifdef TIOCNOTTY
	i = open("/dev/tty", O_RDWR);
	if (i >= 0) {
		ioctl(i, (int) TIOCNOTTY, (char *)0);      
		close(i);
	}
#endif /* TIOCNOTTY */
#endif
	/* make sure that stdin, stdout an stderr don't stuff things
           up (library functions, for example) */
	for (i=0;i<3;i++) {
		close(i); 
		open("/dev/null", O_RDWR);
	}
}

/*******************************************************************
 return the IP addr of the client as a string 
 ******************************************************************/
char *client_addr(int fd)
{
	struct sockaddr sa;
	struct sockaddr_in *sockin = (struct sockaddr_in *) (&sa);
	int     length = sizeof(sa);
	static char addr_buf[100];
	static int initialised;

	if (initialised) return addr_buf;

	initialised = 1;

	if (getpeername(fd, &sa, &length)) {
		exit_cleanup(RERR_SOCKETIO);
	}
	
	strlcpy(addr_buf,(char *)inet_ntoa(sockin->sin_addr), sizeof(addr_buf));
	return addr_buf;
}


/*******************************************************************
 return the DNS name of the client 
 ******************************************************************/
char *client_name(int fd)
{
	struct sockaddr sa;
	struct sockaddr_in *sockin = (struct sockaddr_in *) (&sa);
	int     length = sizeof(sa);
	static char name_buf[100];
	struct hostent *hp;
	char **p;
	char *def = "UNKNOWN";
	static int initialised;

	if (initialised) return name_buf;

	initialised = 1;

	strcpy(name_buf,def);

	if (getpeername(fd, &sa, &length)) {
		exit_cleanup(RERR_SOCKETIO);
	}

	/* Look up the remote host name. */
	if ((hp = gethostbyaddr((char *) &sockin->sin_addr,
				sizeof(sockin->sin_addr),
				AF_INET))) {
		strlcpy(name_buf,(char *)hp->h_name,sizeof(name_buf));
	}


	/* do a forward lookup as well to prevent spoofing */
	hp = gethostbyname(name_buf);
	if (!hp) {
		strcpy(name_buf,def);
		rprintf(FERROR,"reverse name lookup failed\n");
	} else {
		for (p=hp->h_addr_list;*p;p++) {
			if (memcmp(*p, &sockin->sin_addr, hp->h_length) == 0) {
				break;
			}
		}
		if (!*p) {
			strcpy(name_buf,def);
			rprintf(FERROR,"reverse name lookup mismatch - spoofed address?\n");
		} 
	}

	return name_buf;
}
Commit	Line	Data
bc2e93eb AT	1	/*
	2	Copyright (C) Andrew Tridgell 1998
	3
	4	This program is free software; you can redistribute it and/or modify
	5	it under the terms of the GNU General Public License as published by
	6	the Free Software Foundation; either version 2 of the License, or
	7	(at your option) any later version.
	8
	9	This program is distributed in the hope that it will be useful,
	10	but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	GNU General Public License for more details.
	13
	14	You should have received a copy of the GNU General Public License
	15	along with this program; if not, write to the Free Software
	16	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	17	*/
	18
	19	/*
	20	socket functions used in rsync
	21
	22	*/
	23
f0fca04e AT	24	#include "rsync.h"
	25
	26	/* open a socket to a tcp remote host with the specified port
	27	based on code from Warren */
bc2e93eb AT	28	int open_socket_out(char *host, int port)
bc2e93eb AT	29	{
f0fca04e AT	30	int type = SOCK_STREAM;
	31	struct sockaddr_in sock_out;
	32	int res;
	33	struct hostent *hp;
	34
	35
	36	res = socket(PF_INET, type, 0);
	37	if (res == -1) {
	38	return -1;
	39	}
	40
	41	hp = gethostbyname(host);
	42	if (!hp) {
	43	rprintf(FERROR,"unknown host: %s\n", host);
	44	return -1;
	45	}
	46
	47	memcpy(&sock_out.sin_addr, hp->h_addr, hp->h_length);
	48	sock_out.sin_port = htons(port);
	49	sock_out.sin_family = PF_INET;
	50
	51	if (connect(res,(struct sockaddr *)&sock_out,sizeof(sock_out))) {
	52	close(res);
	53	rprintf(FERROR,"failed to connect to %s - %s\n", host, strerror(errno));
	54	return -1;
	55	}
	56
3eb38818 AT	57	set_nonblocking(res);
3eb38818 AT	58
f0fca04e AT	59	return res;
	60	}
	61
	62
	63	/****************************************************************************
	64	open a socket of the specified type, port and address for incoming data
	65	****************************************************************************/
	66	static int open_socket_in(int type, int port)
	67	{
	68	struct hostent *hp;
	69	struct sockaddr_in sock;
	70	char host_name[200];
	71	int res;
	72	int one=1;
	73
	74	/* get my host name */
	75	if (gethostname(host_name, sizeof(host_name)) == -1) {
	76	rprintf(FERROR,"gethostname failed\n");
	77	return -1;
	78	}
	79
	80	/* get host info */
	81	if ((hp = gethostbyname(host_name)) == 0) {
	82	rprintf(FERROR,"gethostbyname: Unknown host %s\n",host_name);
	83	return -1;
	84	}
	85
f5780433	86	memset((char *)&sock,0,sizeof(sock));
f0fca04e AT	87	memcpy((char )&sock.sin_addr,(char )hp->h_addr, hp->h_length);
	88	sock.sin_port = htons(port);
	89	sock.sin_family = hp->h_addrtype;
	90	sock.sin_addr.s_addr = INADDR_ANY;
	91	res = socket(hp->h_addrtype, type, 0);
	92	if (res == -1) {
	93	rprintf(FERROR,"socket failed\n");
	94	return -1;
	95	}
	96
	97	setsockopt(res,SOL_SOCKET,SO_REUSEADDR,(char *)&one,sizeof(one));
	98
	99	/* now we've got a socket - we need to bind it */
	100	if (bind(res, (struct sockaddr * ) &sock,sizeof(sock)) == -1) {
	101	rprintf(FERROR,"bind failed on port %d\n", port);
	102	close(res);
	103	return -1;
	104	}
	105
	106	return res;
	107	}
	108
	109
	110	/****************************************************************************
	111	determine if a file descriptor is in fact a socket
	112	****************************************************************************/
	113	int is_a_socket(int fd)
	114	{
3eb38818 AT	115	int v,l;
	116	l = sizeof(int);
	117	return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
f0fca04e AT	118	}
	119
	120
8ef4ffd6	121	void start_accept_loop(int port, int (*fn)(int ))
f0fca04e AT	122	{
	123	int s;
	124
f0fca04e AT	125	/* open an incoming socket */
	126	s = open_socket_in(SOCK_STREAM, port);
	127	if (s == -1)
65417579	128	exit_cleanup(RERR_SOCKETIO);
f0fca04e AT	129
	130	/* ready to listen */
	131	if (listen(s, 5) == -1) {
	132	close(s);
65417579	133	exit_cleanup(RERR_SOCKETIO);
f0fca04e AT	134	}
	135
	136
	137	/* now accept incoming connections - forking a new process
	138	for each incoming connection */
	139	while (1) {
	140	fd_set fds;
	141	int fd;
	142	struct sockaddr addr;
	143	int in_addrlen = sizeof(addr);
	144
	145	FD_ZERO(&fds);
	146	FD_SET(s, &fds);
	147
	148	if (select(s+1, &fds, NULL, NULL, NULL) != 1) {
	149	continue;
	150	}
	151
	152	if(!FD_ISSET(s, &fds)) continue;
	153
	154	fd = accept(s,&addr,&in_addrlen);
	155
	156	if (fd == -1) continue;
	157
31f440e6 AT	158	signal(SIGCHLD, SIG_IGN);
	159
	160	/* we shouldn't have any children left hanging around
	161	but I have had reports that on Digital Unix zombies
	162	are produced, so this ensures that they are reaped */
	163	#ifdef WNOHANG
	164	waitpid(-1, NULL, WNOHANG);
	165	#endif
	166
f0fca04e AT	167	if (fork()==0) {
	168	close(s);
	169
3eb38818 AT	170	set_nonblocking(fd);
3eb38818 AT	171
f0fca04e AT	172	_exit(fn(fd));
	173	}
	174
	175	close(fd);
	176	}
f0fca04e AT	177	}
	178
	179
	180	enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON};
	181
	182	struct
	183	{
	184	char *name;
	185	int level;
	186	int option;
	187	int value;
	188	int opttype;
	189	} socket_options[] = {
	190	{"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL},
	191	{"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL},
	192	{"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL},
	193	#ifdef TCP_NODELAY
	194	{"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL},
	195	#endif
	196	#ifdef IPTOS_LOWDELAY
	197	{"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON},
	198	#endif
	199	#ifdef IPTOS_THROUGHPUT
	200	{"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON},
	201	#endif
	202	#ifdef SO_SNDBUF
	203	{"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT},
	204	#endif
	205	#ifdef SO_RCVBUF
	206	{"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT},
	207	#endif
	208	#ifdef SO_SNDLOWAT
	209	{"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT},
	210	#endif
	211	#ifdef SO_RCVLOWAT
	212	{"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT},
	213	#endif
	214	#ifdef SO_SNDTIMEO
	215	{"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT},
	216	#endif
	217	#ifdef SO_RCVTIMEO
	218	{"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT},
	219	#endif
	220	{NULL,0,0,0,0}};
	221
	222
	223
	224	/****************************************************************************
	225	set user socket options
	226	****************************************************************************/
	227	void set_socket_options(int fd, char *options)
	228	{
	229	char *tok;
a6801c39 AT	230	if (!options \|\| !*options) return;
a6801c39 AT	231
f0fca04e AT	232	options = strdup(options);
	233
	234	if (!options) out_of_memory("set_socket_options");
	235
	236	for (tok=strtok(options, " \t,"); tok; tok=strtok(NULL," \t,")) {
	237	int ret=0,i;
	238	int value = 1;
	239	char *p;
	240	int got_value = 0;
	241
	242	if ((p = strchr(tok,'='))) {
	243	*p = 0;
	244	value = atoi(p+1);
	245	got_value = 1;
	246	}
	247
	248	for (i=0;socket_options[i].name;i++)
	249	if (strcmp(socket_options[i].name,tok)==0)
	250	break;
	251
	252	if (!socket_options[i].name) {
	253	rprintf(FERROR,"Unknown socket option %s\n",tok);
	254	continue;
	255	}
	256
	257	switch (socket_options[i].opttype) {
	258	case OPT_BOOL:
	259	case OPT_INT:
	260	ret = setsockopt(fd,socket_options[i].level,
	261	socket_options[i].option,(char *)&value,sizeof(int));
	262	break;
	263
	264	case OPT_ON:
	265	if (got_value)
	266	rprintf(FERROR,"syntax error - %s does not take a value\n",tok);
	267
	268	{
	269	int on = socket_options[i].value;
	270	ret = setsockopt(fd,socket_options[i].level,
	271	socket_options[i].option,(char *)&on,sizeof(int));
	272	}
	273	break;
	274	}
	275
	276	if (ret != 0)
	277	rprintf(FERROR,"Failed to set socket option %s\n",tok);
	278	}
	279
	280	free(options);
	281	}
	282
	283	/****************************************************************************
	284	become a daemon, discarding the controlling terminal
	285	****************************************************************************/
	286	void become_daemon(void)
	287	{
b11ed3b1 AT	288	int i;
b11ed3b1 AT	289
c46ded46	290	if (fork()) {
f0fca04e	291	_exit(0);
c46ded46	292	}
f0fca04e AT	293
	294	/* detach from the terminal */
	295	#ifdef HAVE_SETSID
	296	setsid();
	297	#else
	298	#ifdef TIOCNOTTY
c46ded46 AT	299	i = open("/dev/tty", O_RDWR);
	300	if (i >= 0) {
	301	ioctl(i, (int) TIOCNOTTY, (char *)0);
	302	close(i);
f0fca04e AT	303	}
	304	#endif /* TIOCNOTTY */
	305	#endif
b11ed3b1 AT	306	/* make sure that stdin, stdout an stderr don't stuff things
	307	up (library functions, for example) */
	308	for (i=0;i<3;i++) {
	309	close(i);
	310	open("/dev/null", O_RDWR);
	311	}
bc2e93eb	312	}
ff8b29b8 AT	313
	314	/*******************************************************************
	315	return the IP addr of the client as a string
	316	******************************************************************/
	317	char *client_addr(int fd)
	318	{
	319	struct sockaddr sa;
	320	struct sockaddr_in sockin = (struct sockaddr_in ) (&sa);
	321	int length = sizeof(sa);
	322	static char addr_buf[100];
11a5a3c7 AT	323	static int initialised;
	324
	325	if (initialised) return addr_buf;
	326
	327	initialised = 1;
ff8b29b8 AT	328
ff8b29b8 AT	329	if (getpeername(fd, &sa, &length)) {
65417579	330	exit_cleanup(RERR_SOCKETIO);
ff8b29b8	331	}
11a5a3c7	332
37f9805d	333	strlcpy(addr_buf,(char *)inet_ntoa(sockin->sin_addr), sizeof(addr_buf));
ff8b29b8 AT	334	return addr_buf;
	335	}
	336
	337
	338	/*******************************************************************
	339	return the DNS name of the client
	340	******************************************************************/
	341	char *client_name(int fd)
	342	{
	343	struct sockaddr sa;
	344	struct sockaddr_in sockin = (struct sockaddr_in ) (&sa);
	345	int length = sizeof(sa);
	346	static char name_buf[100];
	347	struct hostent *hp;
de5fb374 AT	348	char **p;
de5fb374 AT	349	char *def = "UNKNOWN";
11a5a3c7 AT	350	static int initialised;
	351
	352	if (initialised) return name_buf;
	353
	354	initialised = 1;
ff8b29b8	355
de5fb374	356	strcpy(name_buf,def);
ff8b29b8 AT	357
ff8b29b8 AT	358	if (getpeername(fd, &sa, &length)) {
65417579	359	exit_cleanup(RERR_SOCKETIO);
ff8b29b8 AT	360	}
	361
	362	/* Look up the remote host name. */
	363	if ((hp = gethostbyaddr((char *) &sockin->sin_addr,
	364	sizeof(sockin->sin_addr),
	365	AF_INET))) {
37f9805d	366	strlcpy(name_buf,(char *)hp->h_name,sizeof(name_buf));
ff8b29b8 AT	367	}
ff8b29b8 AT	368
de5fb374 AT	369
	370	/* do a forward lookup as well to prevent spoofing */
	371	hp = gethostbyname(name_buf);
	372	if (!hp) {
	373	strcpy(name_buf,def);
	374	rprintf(FERROR,"reverse name lookup failed\n");
	375	} else {
	376	for (p=hp->h_addr_list;*p;p++) {
	377	if (memcmp(*p, &sockin->sin_addr, hp->h_length) == 0) {
	378	break;
	379	}
	380	}
	381	if (!*p) {
	382	strcpy(name_buf,def);
	383	rprintf(FERROR,"reverse name lookup mismatch - spoofed address?\n");
	384	}
	385	}
	386
ff8b29b8 AT	387	return name_buf;
ff8b29b8 AT	388	}