[moira.git] / reg_svr / admin_call.c

/*
 *	$Source$
 *	$Author$
 *	$Header$
 *
 *	Copyright (C) 1987 by the Massachusetts Institute of Technology
 *
 *	Utility functions for communication with the Kerberos admin_server
 *
 * 	Original version written by Jeffery I. Schiller, January 1987
 *	Completely gutted and rewritten by Bill Sommerfeld, August 1987
 *
 */

#ifndef lint
static char *rcsid_admin_call_c = "$Header$";
#endif lint

#include <sys/errno.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netinet/in.h>

#include <netdb.h>
#include <strings.h>
#include <stdio.h>

#include "admin_err.h"
#include "admin_server.h"
#include "prot.h"
#include "krb.h"

extern int krb_err_base;	/* Offset between com_err and kerberos codes */
extern int errno;		/* System call error numbers */

extern long gethostid();

static u_char *strapp();		/* string append function */

static int inited = 0;		/* are we initialized? */
static int admin_fd = -1;	/* socket to talk to admin_server. */

static struct sockaddr_in admin_addr; /* address of admin server. */
static struct sockaddr_in my_addr;    /* address bound to admin_fd. */
static int my_addr_len;		/* size of above address. */

static char krbrlm[REALM_SZ];	/* Local kerberos realm */
static char krbhost[BUFSIZ];	/* Name of server for local realm */
char admin_errmsg[BUFSIZ]; /* Server error message */

/*
 * Initialize socket, etc. to use to talk to admin_server.
 */

int admin_call_init()
{
    register int status = 0;
    
    if (!inited) {
	struct hostent *hp;	/* host to talk to */
	struct servent *sp;	/* service to talk to */

	init_kadm_err_tbl();
	if (status = get_krbrlm(krbrlm, 1)) {
	    status += krb_err_base;
	    goto punt;
	}

	/*
	 * Locate server.
	 */

	if (status = get_krbhst(krbhost, krbrlm, 1)) {
	    status += krb_err_base;
	    goto punt;
	}
	hp = gethostbyname(krbhost);
	if (!hp) {
	    status = ADMIN_UNKNOWN_HOST;
	    goto punt;
	}
	sp = getservbyname("atest3", "udp");
	if (!sp) {
	    status = ADMIN_UNKNOWN_SERVICE;
	    goto punt;
	}
	bzero((char *)&admin_addr, sizeof(admin_addr));
	admin_addr.sin_family = hp->h_addrtype;
	bcopy((char *)hp->h_addr, (char *)&admin_addr.sin_addr, hp->h_length);
	admin_addr.sin_port = sp->s_port;

	inited = 1;
    }
    return 0;
    
punt:
    (void) close(admin_fd);
    admin_fd = -1;
    return status;
}

/*
 * Build and transmit request to admin_server, and wait for
 * response from server.  Returns a standard error code.
 */

int
admin_call(opcode, pname, old_passwd, new_passwd, crypt_passwd)
    int opcode;
    char *pname;
    char *old_passwd;
    char *new_passwd;
    char *crypt_passwd;
{
    int status;
    register u_char *bp;	/* Pointer into buffer. */
    u_char *ep;			/* End of buffer pointer. */
    
    u_char pvt_buf[BUFSIZ];	/* private message plaintext */
    int pvt_len;		/* length of valid data in pvt_buf */

    u_char sealed_buf[BUFSIZ];	/* sealed version of private message */
    int sealed_len;		/* length of valid data in sealed_buf */
    
    u_long checksum;		/* quad_cksum of sealed request. */
    
    C_Block sess_key;		/* Session key. */
    Key_schedule sess_sched;	/* Key schedule for above. */
    
    CREDENTIALS cred;		/* Kerberos credentials. */
    KTEXT_ST authent;		/* Authenticator */
    KTEXT_ST reply;		/* Reply from admin_server */
    MSG_DAT msg_data;		/* Decrypted message */
    int attempts;		/* Number of retransmits so far */

    struct sockaddr rec_addr;	/* Address we got reply from */
    int rec_addr_len;		/* Length of that address */
    int on = 1;			/* ioctl argument */
	
    
    if (!inited) {
	status = admin_call_init();
	if (status) goto bad;
    }

    /*
     * assemble packet:
     *
     * sealed message consists of:
     * version number (one byte).
     * request code (one byte).
     * principal name (null terminated).
     * new password (in the clear, null terminated).
     * old password or instance (null terminated)
     * crypt(new password, seed) (null terminated).
     * an extra null.
     * a '\001' character.
     * This is all sealed inside a private_message, with an
     * authenticator tacked on in front.
     */

    bp = pvt_buf;
    ep = pvt_buf + sizeof(pvt_buf);
    
    *bp++ = PW_SRV_VERSION;
    *bp++ = opcode;
    if ((bp = strapp(bp, (u_char *)pname, ep)) &&
	(bp = strapp(bp, (u_char *)new_passwd, ep)) &&
	(bp = strapp(bp, (u_char *)old_passwd, ep)) &&
	(bp = strapp(bp, (u_char *)crypt_passwd, ep))) {
	*bp++ = '\0';
	*bp++ = '\1';
	pvt_len = bp - pvt_buf;
    } else {
	status = ADMIN_TOO_LONG;
	goto bad;
    }
    
    /*
     * find our session key.
     */

    if (status = krb_get_cred("changepw", "kerberos", krbrlm, &cred)) {
	status += krb_err_base;
	goto bad;
    }

    bcopy((char *)cred.session, (char *)sess_key, sizeof(sess_key));
    bzero((char *)cred.session, sizeof(sess_key)); /* lest we remember */

    if(key_sched(sess_key, sess_sched)) {
	status = ADMIN_BAD_KEY;
	goto bad;
    }

    /*
     * Set up socket.
     */

    admin_fd = socket(admin_addr.sin_family, SOCK_DGRAM, 0);
    if (admin_fd < 0) {
	status = errno;
	goto bad;
    }

    bzero((char *)&my_addr, sizeof(my_addr));
    
    my_addr.sin_family = admin_addr.sin_family;
    my_addr.sin_addr.s_addr = gethostid();

    if (bind(admin_fd, &my_addr, sizeof(my_addr)) < 0) {
	status = errno;
	goto bad;
    }

    my_addr_len = sizeof(my_addr);

    if (getsockname(admin_fd, (struct sockaddr *)&my_addr,
		    &my_addr_len) < 0) {
	status = errno;
	goto bad;
    }

    if (ioctl(admin_fd, FIONBIO, (char *)&on) < 0) {
	status = errno;
	goto bad;
    }
	
    /*
     * Encrypt the message using the session key.
     * Since this contains passwords, it must be kept from prying eyes.
     */

    sealed_len = krb_mk_priv(pvt_buf, sealed_buf, pvt_len,
				    sess_sched, sess_key, &my_addr,
				    &admin_addr);
    if (sealed_len < 0) {
	status = ADMIN_CANT_ENCRYPT;
	goto bad;
    }

    /*
     * Checksum the cypher text, to guard against tampering in flight.
     */

    checksum = quad_cksum(sealed_buf, NULL, sealed_len, 0, sess_key);
    
    /*
     * Make an authenticator, so the server can learn the session key
     * and know who we are.
     */

    if (status = krb_mk_req(&authent, "changepw", "kerberos", krbrlm,
			   checksum)) {
	status += krb_err_base;
	goto bad;
    }

    /*
     * Add the sealed message to the end of the authenticator.
     */

    if ((authent.length + sealed_len) > MAX_KTXT_LEN) {
	status = ADMIN_TOO_LONG;
	goto bad;
    }

    bcopy(sealed_buf, authent.dat + authent.length, sealed_len);
    authent.length += sealed_len;

    /*
     * send it off, and wait for a reply.
     */

    attempts = 0;
    
    while (attempts++ < RETRY_LIMIT) {
	int active;		/* number of active fds (from select). */
	fd_set set;		/* interesting fd's. */
	struct timeval timeout;	/* timeout on select. */
	
	if (sendto(admin_fd, (char *)authent.dat, authent.length,
		   0, &admin_addr, sizeof(admin_addr)) != authent.length) {
	    status = errno;
	    goto bad;
	}

	FD_ZERO(&set);
	FD_SET(admin_fd, &set);

	timeout.tv_sec = USER_TIMEOUT;
	timeout.tv_usec = 0;
	    
	active = select(admin_fd+1, &set, (fd_set *)0, (fd_set *)0, &timeout);
	if (active < 0) {
	    status = errno;
	    goto bad;
	} else if (active == 0) continue;
	else {
	    reply.length = recvfrom(admin_fd, (char *)reply.dat,
				    sizeof(reply.dat), 0,
				    &rec_addr, &rec_addr_len);
	    if (reply.length < 0) continue;
#ifdef notdef
	    if (!bcmp(&rec_addr, &admin_addr, sizeof(admin_addr)))
		/* the spoofers are out in force.. */
		continue;
#endif notdef
	    break;		/* got one.. */
	}
    }

    if (attempts > RETRY_LIMIT) {
	status = ETIMEDOUT;
	goto bad;
    }

    if (pkt_version((&reply)) != KRB_PROT_VERSION) {
	status = ADMIN_BAD_VERSION;
	goto bad;
    }

    if ((pkt_msg_type((&reply)) & ~1) != AUTH_MSG_PRIVATE) {
	bp = reply.dat;
	if (*bp++ != KRB_PROT_VERSION) {
	    status = ADMIN_BAD_VERSION;
	    goto bad;
	}
	if (*bp++ != AUTH_MSG_ERR_REPLY) {
	    status = ADMIN_UNKNOWN_CODE;
	    goto bad;
	}
	bp += strlen((char *)bp) + 1;	/* Skip name */
	bp += strlen((char *)bp) + 1;	/* Skip instance */
	bp += strlen((char *)bp) + 1;	/* Skip realm */

	/* null-terminate error string */
	reply.dat[reply.length] = '\0'; 

	if (*bp++ == 126) {
	    status = ADMIN_SERVER_ERROR;
	    strcpy(admin_errmsg, bp);
	    goto bad;
	} else {
	    status = ADMIN_UNKNOWN_CODE;
	    goto bad;
	}
    }
    status = krb_rd_priv(reply.dat, reply.length,
			    sess_sched, sess_key,
			    &admin_addr, &my_addr,
			    &msg_data);
    if (status) {
	status += krb_err_base;
	goto bad;
    }
    bp = msg_data.app_data;

    if (*bp++ != PW_SRV_VERSION) {
	status = ADMIN_BAD_VERSION;
	goto bad;
    }
    if (*bp++ != INSTALL_REPLY) {
	status = ADMIN_UNKNOWN_CODE;
	goto bad;
    }

    status = 0;
    /* fall through into cleanup */

bad:
    /*
     * Paranoia: shred all the incriminating evidence.
     * We'll let the caller shred the arguments.
     */
    bzero((char *)sess_key, sizeof(sess_key));
    bzero((char *)sess_sched, sizeof(sess_sched));
    bzero(pvt_buf, sizeof(pvt_buf));
        
    if (admin_fd >= 0) {
	(void) close(admin_fd);
	admin_fd = -1;
    }

    return status;
}

/*
 * Copies characters from source to dest, returning a pointer to the
 * point in dest after the last character copied from source.
 * If this would be greater than end, no characters are copied, and NULL
 * is returned instead.
 */

static u_char *strapp(dest, source, end)
    register u_char *dest, *source, *end;
{
    register int length = strlen(source) + 1;
    if (dest+length > end) return NULL;
    else {
	bcopy(source, dest, length);
	return dest + length;
    }
}

/*
 * Local Variables:
 * mode: c
 * c-indent-level: 4
 * c-continued-statement-offset: 4
 * c-brace-offset: -4
 * c-argdecl-indent: 4
 * c-label-offset: -4
 * End:
 */
Commit	Line	Data
718bc25c	1	/*
	2	* $Source$
	3	* $Author$
	4	* $Header$
	5	*
	6	* Copyright (C) 1987 by the Massachusetts Institute of Technology
	7	*
	8	* Utility functions for communication with the Kerberos admin_server
	9	*
	10	* Original version written by Jeffery I. Schiller, January 1987
	11	* Completely gutted and rewritten by Bill Sommerfeld, August 1987
	12	*
718bc25c	13	*/
	14
	15	#ifndef lint
	16	static char *rcsid_admin_call_c = "$Header$";
	17	#endif lint
	18
	19	#include <sys/errno.h>
	20	#include <sys/types.h>
	21	#include <sys/time.h>
	22	#include <sys/ioctl.h>
	23	#include <sys/socket.h>
	24	#include <netinet/in.h>
	25
	26	#include <netdb.h>
	27	#include <strings.h>
	28	#include <stdio.h>
	29
	30	#include "admin_err.h"
	31	#include "admin_server.h"
	32	#include "prot.h"
	33	#include "krb.h"
	34
	35	extern int krb_err_base; /* Offset between com_err and kerberos codes */
	36	extern int errno; /* System call error numbers */
	37
	38	extern long gethostid();
	39
	40	static u_char strapp(); / string append function */
	41
	42	static int inited = 0; /* are we initialized? */
	43	static int admin_fd = -1; /* socket to talk to admin_server. */
	44
	45	static struct sockaddr_in admin_addr; /* address of admin server. */
	46	static struct sockaddr_in my_addr; /* address bound to admin_fd. */
	47	static int my_addr_len; /* size of above address. */
	48
	49	static char krbrlm[REALM_SZ]; /* Local kerberos realm */
71a6c578	50	static char krbhost[BUFSIZ]; /* Name of server for local realm */
074685e3	51	char admin_errmsg[BUFSIZ]; /* Server error message */
718bc25c	52
	53	/*
	54	* Initialize socket, etc. to use to talk to admin_server.
	55	*/
	56
	57	int admin_call_init()
	58	{
	59	register int status = 0;
	60
	61	if (!inited) {
	62	struct hostent hp; / host to talk to */
	63	struct servent sp; / service to talk to */
3004ebdb	64
718bc25c	65	init_kadm_err_tbl();
	66	if (status = get_krbrlm(krbrlm, 1)) {
	67	status += krb_err_base;
	68	goto punt;
	69	}
	70
	71	/*
	72	* Locate server.
	73	*/
	74
71a6c578	75	if (status = get_krbhst(krbhost, krbrlm, 1)) {
	76	status += krb_err_base;
	77	goto punt;
	78	}
	79	hp = gethostbyname(krbhost);
718bc25c	80	if (!hp) {
	81	status = ADMIN_UNKNOWN_HOST;
	82	goto punt;
	83	}
	84	sp = getservbyname("atest3", "udp");
	85	if (!sp) {
	86	status = ADMIN_UNKNOWN_SERVICE;
	87	goto punt;
	88	}
	89	bzero((char *)&admin_addr, sizeof(admin_addr));
	90	admin_addr.sin_family = hp->h_addrtype;
	91	bcopy((char )hp->h_addr, (char )&admin_addr.sin_addr, hp->h_length);
	92	admin_addr.sin_port = sp->s_port;
	93
718bc25c	94	inited = 1;
	95	}
	96	return 0;
	97
	98	punt:
	99	(void) close(admin_fd);
	100	admin_fd = -1;
	101	return status;
	102	}
	103
	104	/*
	105	* Build and transmit request to admin_server, and wait for
	106	* response from server. Returns a standard error code.
	107	*/
	108
	109	int
	110	admin_call(opcode, pname, old_passwd, new_passwd, crypt_passwd)
	111	int opcode;
	112	char *pname;
	113	char *old_passwd;
	114	char *new_passwd;
	115	char *crypt_passwd;
	116	{
	117	int status;
	118	register u_char bp; / Pointer into buffer. */
	119	u_char ep; / End of buffer pointer. */
	120
	121	u_char pvt_buf[BUFSIZ]; /* private message plaintext */
	122	int pvt_len; /* length of valid data in pvt_buf */
	123
	124	u_char sealed_buf[BUFSIZ]; /* sealed version of private message */
	125	int sealed_len; /* length of valid data in sealed_buf */
	126
	127	u_long checksum; /* quad_cksum of sealed request. */
	128
	129	C_Block sess_key; /* Session key. */
	130	Key_schedule sess_sched; /* Key schedule for above. */
	131
	132	CREDENTIALS cred; /* Kerberos credentials. */
	133	KTEXT_ST authent; /* Authenticator */
	134	KTEXT_ST reply; /* Reply from admin_server */
	135	MSG_DAT msg_data; /* Decrypted message */
	136	int attempts; /* Number of retransmits so far */
	137
	138	struct sockaddr rec_addr; /* Address we got reply from */
	139	int rec_addr_len; /* Length of that address */
3004ebdb	140	int on = 1; /* ioctl argument */
3004ebdb	141
718bc25c	142
	143	if (!inited) {
	144	status = admin_call_init();
	145	if (status) goto bad;
	146	}
	147
	148	/*
	149	* assemble packet:
	150	*
	151	* sealed message consists of:
	152	* version number (one byte).
	153	* request code (one byte).
	154	* principal name (null terminated).
	155	* new password (in the clear, null terminated).
	156	* old password or instance (null terminated)
	157	* crypt(new password, seed) (null terminated).
	158	* an extra null.
	159	* a '\001' character.
	160	* This is all sealed inside a private_message, with an
	161	* authenticator tacked on in front.
	162	*/
	163
	164	bp = pvt_buf;
	165	ep = pvt_buf + sizeof(pvt_buf);
	166
	167	*bp++ = PW_SRV_VERSION;
	168	*bp++ = opcode;
	169	if ((bp = strapp(bp, (u_char *)pname, ep)) &&
	170	(bp = strapp(bp, (u_char *)new_passwd, ep)) &&
	171	(bp = strapp(bp, (u_char *)old_passwd, ep)) &&
	172	(bp = strapp(bp, (u_char *)crypt_passwd, ep))) {
	173	*bp++ = '\0';
	174	*bp++ = '\1';
	175	pvt_len = bp - pvt_buf;
	176	} else {
	177	status = ADMIN_TOO_LONG;
	178	goto bad;
	179	}
	180
	181	/*
	182	* find our session key.
	183	*/
	184
e5fdb505	185	if (status = krb_get_cred("changepw", "kerberos", krbrlm, &cred)) {
718bc25c	186	status += krb_err_base;
	187	goto bad;
	188	}
	189
	190	bcopy((char )cred.session, (char )sess_key, sizeof(sess_key));
	191	bzero((char )cred.session, sizeof(sess_key)); / lest we remember */
	192
	193	if(key_sched(sess_key, sess_sched)) {
	194	status = ADMIN_BAD_KEY;
	195	goto bad;
	196	}
	197
3004ebdb	198	/*
	199	* Set up socket.
	200	*/
	201
	202	admin_fd = socket(admin_addr.sin_family, SOCK_DGRAM, 0);
	203	if (admin_fd < 0) {
	204	status = errno;
	205	goto bad;
	206	}
	207
	208	bzero((char *)&my_addr, sizeof(my_addr));
	209
	210	my_addr.sin_family = admin_addr.sin_family;
	211	my_addr.sin_addr.s_addr = gethostid();
	212
	213	if (bind(admin_fd, &my_addr, sizeof(my_addr)) < 0) {
	214	status = errno;
	215	goto bad;
	216	}
	217
	218	my_addr_len = sizeof(my_addr);
	219
	220	if (getsockname(admin_fd, (struct sockaddr *)&my_addr,
	221	&my_addr_len) < 0) {
	222	status = errno;
	223	goto bad;
	224	}
	225
	226	if (ioctl(admin_fd, FIONBIO, (char *)&on) < 0) {
	227	status = errno;
	228	goto bad;
	229	}
	230
718bc25c	231	/*
	232	* Encrypt the message using the session key.
	233	* Since this contains passwords, it must be kept from prying eyes.
	234	*/
	235
e5fdb505	236	sealed_len = krb_mk_priv(pvt_buf, sealed_buf, pvt_len,
718bc25c	237	sess_sched, sess_key, &my_addr,
	238	&admin_addr);
	239	if (sealed_len < 0) {
	240	status = ADMIN_CANT_ENCRYPT;
	241	goto bad;
	242	}
	243
	244	/*
	245	* Checksum the cypher text, to guard against tampering in flight.
	246	*/
	247
	248	checksum = quad_cksum(sealed_buf, NULL, sealed_len, 0, sess_key);
	249
	250	/*
	251	* Make an authenticator, so the server can learn the session key
	252	* and know who we are.
	253	*/
	254
e5fdb505	255	if (status = krb_mk_req(&authent, "changepw", "kerberos", krbrlm,
718bc25c	256	checksum)) {
	257	status += krb_err_base;
	258	goto bad;
	259	}
	260
	261	/*
	262	* Add the sealed message to the end of the authenticator.
	263	*/
	264
	265	if ((authent.length + sealed_len) > MAX_KTXT_LEN) {
	266	status = ADMIN_TOO_LONG;
	267	goto bad;
	268	}
	269
	270	bcopy(sealed_buf, authent.dat + authent.length, sealed_len);
	271	authent.length += sealed_len;
	272
	273	/*
	274	* send it off, and wait for a reply.
	275	*/
	276
	277	attempts = 0;
	278
	279	while (attempts++ < RETRY_LIMIT) {
	280	int active; /* number of active fds (from select). */
	281	fd_set set; /* interesting fd's. */
	282	struct timeval timeout; /* timeout on select. */
	283
	284	if (sendto(admin_fd, (char *)authent.dat, authent.length,
	285	0, &admin_addr, sizeof(admin_addr)) != authent.length) {
	286	status = errno;
	287	goto bad;
	288	}
	289
	290	FD_ZERO(&set);
	291	FD_SET(admin_fd, &set);
	292
	293	timeout.tv_sec = USER_TIMEOUT;
	294	timeout.tv_usec = 0;
	295
	296	active = select(admin_fd+1, &set, (fd_set )0, (fd_set )0, &timeout);
	297	if (active < 0) {
	298	status = errno;
	299	goto bad;
	300	} else if (active == 0) continue;
	301	else {
	302	reply.length = recvfrom(admin_fd, (char *)reply.dat,
	303	sizeof(reply.dat), 0,
	304	&rec_addr, &rec_addr_len);
	305	if (reply.length < 0) continue;
	306	#ifdef notdef
	307	if (!bcmp(&rec_addr, &admin_addr, sizeof(admin_addr)))
	308	/* the spoofers are out in force.. */
	309	continue;
	310	#endif notdef
	311	break; /* got one.. */
	312	}
	313	}
	314
	315	if (attempts > RETRY_LIMIT) {
	316	status = ETIMEDOUT;
	317	goto bad;
	318	}
	319
320	if (pkt_version((&reply)) != KRB_PROT_VERSION) {
321	status = ADMIN_BAD_VERSION;
322	goto bad;
323	}
324
325	if ((pkt_msg_type((&reply)) & ~1) != AUTH_MSG_PRIVATE) {
326	bp = reply.dat;
327	if (*bp++ != KRB_PROT_VERSION) {
328	status = ADMIN_BAD_VERSION;
329	goto bad;
330	}
331	if (*bp++ != AUTH_MSG_ERR_REPLY) {
332	status = ADMIN_UNKNOWN_CODE;
333	goto bad;
334	}
335	bp += strlen((char )bp) + 1; / Skip name */
336	bp += strlen((char )bp) + 1; / Skip instance */
337	bp += strlen((char )bp) + 1; / Skip realm */
338
339	/* null-terminate error string */
340	reply.dat[reply.length] = '\0';
341
342	if (*bp++ == 126) {
343	status = ADMIN_SERVER_ERROR;
344	strcpy(admin_errmsg, bp);
345	goto bad;
346	} else {
347	status = ADMIN_UNKNOWN_CODE;
348	goto bad;
349	}
350	}
e5fdb505	351	status = krb_rd_priv(reply.dat, reply.length,
718bc25c	352	sess_sched, sess_key,
	353	&admin_addr, &my_addr,
	354	&msg_data);
	355	if (status) {
	356	status += krb_err_base;
	357	goto bad;
	358	}
	359	bp = msg_data.app_data;
	360
	361	if (*bp++ != PW_SRV_VERSION) {
	362	status = ADMIN_BAD_VERSION;
	363	goto bad;
	364	}
	365	if (*bp++ != INSTALL_REPLY) {
	366	status = ADMIN_UNKNOWN_CODE;
	367	goto bad;
	368	}
	369
	370	status = 0;
	371	/* fall through into cleanup */
	372
	373	bad:
	374	/*
	375	* Paranoia: shred all the incriminating evidence.
	376	* We'll let the caller shred the arguments.
	377	*/
	378	bzero((char *)sess_key, sizeof(sess_key));
	379	bzero((char *)sess_sched, sizeof(sess_sched));
	380	bzero(pvt_buf, sizeof(pvt_buf));
3004ebdb	381
	382	if (admin_fd >= 0) {
	383	(void) close(admin_fd);
	384	admin_fd = -1;
	385	}
	386
718bc25c	387	return status;
	388	}
	389
	390	/*
	391	* Copies characters from source to dest, returning a pointer to the
	392	* point in dest after the last character copied from source.
	393	* If this would be greater than end, no characters are copied, and NULL
	394	* is returned instead.
	395	*/
	396
	397	static u_char *strapp(dest, source, end)
	398	register u_char dest, source, *end;
	399	{
	400	register int length = strlen(source) + 1;
	401	if (dest+length > end) return NULL;
	402	else {
	403	bcopy(source, dest, length);
	404	return dest + length;
	405	}
	406	}
	407
	408	/*
	409	* Local Variables:
	410	* mode: c
	411	* c-indent-level: 4
	412	* c-continued-statement-offset: 4
	413	* c-brace-offset: -4
	414	* c-argdecl-indent: 4
	415	* c-label-offset: -4
	416	* End:
	417	*/