/*
 * kadmin/kpasswd/kpasswd.c
 *
 * Copyright 1988 by the Massachusetts Institute of Technology.
 *
 * For copying and distribution information, please see the file
 * <mit-copyright.h>.
 *
 * change your password with kerberos
 */

/* 
 * Sandia National Laboratories also makes no representations about the 
 * suitability of the modifications, or additions to this software for 
 * any purpose.  It is provided "as is" without express or implied warranty.
 */


/*
 * kpasswd
 * change your password with Version 5 Kerberos
 */

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <signal.h>

#include <sys/param.h>
#include <pwd.h>

#include <krb5/adm_defs.h>

#include <sys/stat.h>

#include "krb5.h"
#ifdef USE_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif
#include "com_err.h"

#ifndef MAXPATHLEN
#define MAXPATHLEN 1024
#endif

static krb5_error_code adm5_init_link
	PROTOTYPE((krb5_context, 
    		   krb5_data *,
    		   int *));

static krb5_error_code get_first_ticket 
	PROTOTYPE((krb5_context,
		   krb5_ccache, 
		   krb5_principal,
		   krb5_creds *));

krb5_error_code print_and_choose_password 
	PROTOTYPE((char *, krb5_data *));

struct sockaddr_in local_sin, remote_sin;


extern char *krb5_default_pwd_prompt1;

main(argc,argv)
  int argc;
  char *argv[];
{
    krb5_context context;
    krb5_ccache cache = NULL;
    char cache_name[255];
    krb5_flags cc_flags;

    krb5_address local_addr, foreign_addr;

    struct passwd *pw;

    krb5_principal client;

    char default_name[256];
    char *client_name;		/* Single string representation of client id */

    krb5_data requested_realm;

    char input_string[768];

    krb5_error_code retval;	/* return code */

    int local_socket;

    krb5_error *err_ret;
    krb5_ap_rep_enc_part *rep_ret;

    kadmin_requests rd_priv_resp;

    krb5_data msg_data, inbuf;
    krb5_int32 seqno;

    krb5_creds my_creds, * new_creds;
    char *new_password;
    int new_pwsize;

    krb5_auth_context * new_auth_context;
    krb5_replay_data replaydata;

#ifdef SANDIA
    extern int networked();
    int krb_secure;
    struct stat statbuf;
#endif	/* SANDIA */

#ifdef SANDIA	/* Allow or Disallow Remote Clients to Modify Passwords */
/*
 *	If a Client Modifies a Password using kpasswd on this host
 *	from a remote host or network terminal, the Password selected 
 *	is transmitted across the network in Cleartext.
 *
 *	The systems administrator can disallow "remote" kpasswd usage by
 *	creating the file "/etc/krb.secure"
 */

    krb_secure = 0;
/* 
 *	First check to see if the file /etc/krb.secure exists.
 *	If it does then krb_secure to 1.
 */

    if (stat("/etc/krb.secure", &statbuf) == 0) krb_secure = 1;

/*
 *	Check to see if this process is tied to a physical terminal.
 *	Network() verifies the terminal device is not a pseudo tty
 */
    if (networked() && krb_secure) {
        fprintf(stderr,"Sorry but you cannot %s from a\n", argv[0]);
        fprintf(stderr,"     pseudo tty terminal!\n");
	retval = 1;
	goto finish;
    }
#endif    

	/* (3 * 255) + 1 (/) + 1 (@) + 1 (NULL) */
    if ((client_name = (char *) calloc (1, (3 * 256))) == NULL) {
	fprintf(stderr, "No Memory for Client_name!\n");
	retval = 1;
	goto finish;
    }

    if ((requested_realm.data = (char *) calloc (1, 256)) == NULL) {
	fprintf(stderr, "No Memory for realm_name!\n");
	retval = 1;
	free(client_name);
	goto finish;
    }

    krb5_init_context(&context);
    krb5_init_ets(context);
    memset((char *) default_name, 0, sizeof(default_name));
    
    switch (argc) {
	case 1:		/* No User Specified */

		/* Identify Default Credentials Cache */
	    if ((retval = krb5_cc_default(context, &cache))) {
		fprintf(stderr, "Error while getting default ccache!\n");
		goto finish;
	    }

/*
 * 	Attempt to Modify Credentials Cache 
 *		retval == 0 ==> ccache Exists - Use It 
 * 		retval == ENOENT ==> No Entries, but ccache Exists 
 *		retval != 0 ==> Assume ccache does NOT Exist 
 */
	    cc_flags = 0;
	    if ((retval = krb5_cc_set_flags(context, cache, cc_flags))) {
		/* Search passwd file for client */
		pw = getpwuid((int) getuid());
		if (pw) {
		    (void) strcpy(default_name, pw->pw_name);
		} else {
		    fprintf(stderr, 
			"Unable to Identify Customer from Password File!\n");
		    retval = 1;
		    goto finish;
		}

		/* Use this to get default_realm and format client_name */
		if ((retval = krb5_parse_name(context,default_name, &client))) {
		    fprintf(stderr, "Unable to Parse Client Name!\n");
		    goto finish;
		}

		if ((retval = krb5_unparse_name(context,client,&client_name))) {
		    fprintf(stderr, "Unable to Parse Client Name!\n");
		    goto finish;
		}

		requested_realm.length = client->realm.length;
		memcpy((char *) requested_realm.data, 
			(char *) client->realm.data,
			requested_realm.length);
	    } else {
			/* Read Client from Cache */
		if ((retval = krb5_cc_get_principal(context, cache, 
			(krb5_principal *) &client))) {
		    fprintf(stderr, 
			    "Unable to Read Customer Credentials File!\n");
		    goto finish;
		}

		if ((retval = krb5_unparse_name(context,client,&client_name))) {
           	    fprintf(stderr, "Unable to Parse Client Name!\n");
		    goto finish;
		}

		requested_realm.length = client->realm.length;
		memcpy((char *) requested_realm.data, 
			(char *) client->realm.data,
			requested_realm.length);

		(void) krb5_cc_close(context, cache);
	    }
	    break;

	case 2:		/* Client Gave us a Token - Use it */
			/* Hand Parse Entry */
	    strcpy(input_string, argv[1]);

	    if (retval = krb5_parse_name(context, input_string, &client)) {
		fprintf(stderr, "Error Parsing -u option contents!\n");
		exit(0);
	    }
	    requested_realm.length = client->realm.length;
	    memcpy((char *) requested_realm.data, 
		   (char *) client->realm.data,
		   requested_realm.length);

	    break;

	default:
	    usage();
	    break;
    }

	/* Create credential cache for changepw */
    (void) sprintf(cache_name, "FILE:/tmp/tkt_cpw_%d", getpid());

    if ((retval = krb5_cc_resolve(context, cache_name, &cache))) {
	fprintf(stderr, "Unable to Resolve Cache: %s\n", cache_name);
    }
    
    if ((retval = krb5_cc_initialize(context, cache, client))) {
        fprintf(stderr, "Error initializing cache: %s\n", cache_name);
        goto finish;
    }
 
/*
 *	Verify User by Obtaining Initial Credentials prior to Initial Link
 */

    if ((retval = get_first_ticket(context, cache, client, &my_creds))) {
	goto finish;
    }
    
	/* Initiate Link to Server */
    if ((retval = adm5_init_link(context, &requested_realm, &local_socket))) {
	goto finish;
    } 

#ifdef unicos61
#define SIZEOF_INADDR  SIZEOF_in_addr
#else
#define SIZEOF_INADDR sizeof(struct in_addr)
#endif

	/* V4 kpasswd Protocol Hack */
 {
    int msg_length = 0;

    retval = krb5_net_write(context, local_socket, (char *) &msg_length + 2, 2);
    if (retval < 0) {
        fprintf(stderr, "krb5_net_write failure!\n");
        goto finish;
    }

 }

    local_addr.addrtype = ADDRTYPE_INET;
    local_addr.length = SIZEOF_INADDR ;
    local_addr.contents = (krb5_octet *)&local_sin.sin_addr;

    foreign_addr.addrtype = ADDRTYPE_INET;
    foreign_addr.length = SIZEOF_INADDR ;
    foreign_addr.contents = (krb5_octet *)&remote_sin.sin_addr;

    krb5_auth_con_init(context, &new_auth_context);
    krb5_auth_con_setflags(context, new_auth_context,
			   KRB5_AUTH_CONTEXT_RET_SEQUENCE);

    krb5_auth_con_setaddrs(context, new_auth_context, 
			   &local_addr, &foreign_addr);

    /* call Kerberos library routine to obtain an authenticator,
       pass it over the socket to the server, and obtain mutual
       authentication. */

   inbuf.data = ADM_CPW_VERSION;
   inbuf.length = strlen(ADM_CPW_VERSION);

   if ((retval = krb5_sendauth(context, &new_auth_context,
			(krb5_pointer) &local_socket,
			ADM_CPW_VERSION, 
			my_creds.client, 
			my_creds.server,
			AP_OPTS_MUTUAL_REQUIRED,
			&inbuf,
			NULL,
			cache,
			&err_ret,
			&rep_ret, NULL))) {
	fprintf(stderr, "Error while performing sendauth: %s!\n",
			error_message(retval));
        goto finish;
    }

    /* Get credentials : to use for safe and private messages */
    /* No need to pass my_creds because it's uninizialized. */
    if (retval = krb5_get_credentials(context,0,cache,&my_creds,&new_creds)){
	fprintf(stderr, "Error Obtaining Credentials: %s!\n", 
		error_message(retval));
	goto finish;
    }

    /* Read back what the server has to say... */
     
    if (retval = krb5_read_message(context, &local_socket, &inbuf)){
	fprintf(stderr, " Read Message Error: %s!\n",
	   error_message(retval));
        goto finish;
    }
    if ((inbuf.length != 2) || (inbuf.data[0] != KADMIND) ||
	(inbuf.data[1] != KADMSAG)){
	fprintf(stderr, " Invalid ack from admin server.\n");
	goto finish;
    }

    inbuf.length = 2;
    inbuf.data[0] = KPASSWD;
    inbuf.data[1] = CHGOPER;
    if ((retval = krb5_mk_priv(context, new_auth_context, &inbuf, 
		  	       &msg_data, &replaydata))) {
        fprintf(stderr, "Error during First Message Encoding: %s!\n",
			error_message(retval));
        goto finish;
    }
    free(inbuf.data);

    /* write private message to server */
    if (krb5_write_message(context, &local_socket, &msg_data)){
        fprintf(stderr, "Write Error During First Message Transmission!\n");
	retval = 1;
        goto finish;
    } 
    free(msg_data.data);

#ifdef MACH_PASS /* Machine-generated Passwords */
    /* Ok Now let's get the private message */
    if (retval = krb5_read_message(context, &local_socket, &inbuf)){
        fprintf(stderr, "Read Error During First Reply: %s!\n",
			error_message(retval));
	retval = 1;
        goto finish;
    }

    if ((retval = krb5_rd_priv(context, new_auth_context, &inbuf,
			       &msg_data, &replaydata))) {
        fprintf(stderr, "Error during First Read Decoding: %s!\n", 
			error_message(retval));
        goto finish;
    }
    free(inbuf.data);
#endif

    if ((new_password = (char *) calloc (1, ADM_MAX_PW_LENGTH+1)) == NULL) {
	fprintf(stderr, "Unable to Allocate Space for New Password!\n");
	goto finish;
    }

#ifdef MACH_PASS /* Machine-generated passwords */
	/* Offer Client Password Choices */
    if ((retval = print_and_choose_password(new_password,
			 &msg_data))) {
	(void) memset((char *) new_password, 0, ADM_MAX_PW_LENGTH+1);
	free(new_password);
        goto finish;
    }
#else
    new_pwsize = ADM_MAX_PW_LENGTH+1;
    putchar('\n');
    if ((retval = krb5_read_password(context, 
				     "Enter new password: ",
				     "Re-enter new password for verification: ",
				     new_password,
				     &new_pwsize))) {
	fprintf(stderr, "Error while reading new password for '%s'",
                                client_name);
	(void) memset((char *) new_password, 0, ADM_MAX_PW_LENGTH+1);
	free(new_password);
        goto finish;
    }
    if (new_pwsize == 0) {
	fprintf(stderr, "A null password is not allowed!\n");
	free(new_password);
	goto finish;
    }
#endif

    inbuf.data = new_password;
    inbuf.length = strlen(new_password);

    if ((retval = krb5_mk_priv(context, new_auth_context, &inbuf, 
			       &msg_data, &replaydata))) {
        fprintf(stderr, "Error during Second Message Encoding: %s!\n",
			error_message(retval));
        goto finish;
    }
    memset(inbuf.data,0,inbuf.length);
    free(inbuf.data);

    /* write private message to server */
    if (krb5_write_message(context, &local_socket, &msg_data)){
        fprintf(stderr, "Write Error During Second Message Transmission!\n");
	retval = 1;
        goto finish;
    } 
    free(msg_data.data);

    /* Ok Now let's get the private message */
    if (retval = krb5_read_message(context, &local_socket, &inbuf)){
        fprintf(stderr, "Read Error During Second Reply: %s!\n",
			error_message(retval));
	retval = 1;
        goto finish;
    }

    if ((retval = krb5_rd_priv(context, new_auth_context, &inbuf,
			        &msg_data, &replaydata))) {
        fprintf(stderr, "Error during Second Read Decoding :%s!\n", 
			error_message(retval));
        goto finish;
    }

    rd_priv_resp.appl_code = msg_data.data[0];
    rd_priv_resp.oper_code = msg_data.data[1];
    rd_priv_resp.retn_code = msg_data.data[2];
    if (msg_data.length > 3 && msg_data.data[3]) {
	rd_priv_resp.message = malloc(msg_data.length - 2);
	if (rd_priv_resp.message) {
	    memcpy(rd_priv_resp.message, msg_data.data + 3,
		   msg_data.length - 3);
	    rd_priv_resp.message[msg_data.length - 3] = 0;
	}
    } else
	rd_priv_resp.message = NULL;


    free(inbuf.data);
    free(msg_data.data);
    if (rd_priv_resp.appl_code == KPASSWD) {
	if (rd_priv_resp.retn_code == KPASSGOOD)
	    printf("\n\nPassword changed.\n\n");
	else if (rd_priv_resp.retn_code == KPASSBAD) {
	    if (rd_priv_resp.message)
		fprintf(stderr, "%s\n", rd_priv_resp.message);
	    else
		fprintf(stderr, "Server returned KPASSBAD.\n");
	} else
	    fprintf(stderr, "Server returned unknown kerberos code.\n");
    } else
	fprintf(stderr, "Server returned bad application code %d\n",
		rd_priv_resp.appl_code);
    
    if (rd_priv_resp.message)
	free(rd_priv_resp.message);

    finish:

    (void) krb5_cc_destroy(context, cache);

    free(client_name);
    free(requested_realm.data);

    if (retval) {
	fprintf(stderr, "\n\nProtocol Failure - Password NOT changed\n\n");
	exit(1);
    }

    printf("\n\nPassword changed.\n\n");

    exit(0);
}



krb5_data cpwname = {
        0,
	sizeof(CPWNAME)-1,
	CPWNAME
};

static krb5_error_code
get_first_ticket(context, cache, client, my_creds)
    krb5_context context;
    krb5_ccache cache;
    krb5_principal client;
    krb5_creds *my_creds;
{
    char prompt[255];			/* for the password prompt */
    char pword[ADM_MAX_PW_LENGTH+1];	/* storage for the password */
    char *old_password;
    int  old_pwsize;
    int	 i;
    
    krb5_address **my_addresses;

    char *client_name;
    krb5_error_code retval;
    
    if ((retval = krb5_unparse_name(context, client, &client_name))) {
	fprintf(stderr, "Unable to Unparse Client Name\n");
	return(1);
    }

    (void) sprintf(prompt,"Old password for %s: ", (char *) client_name);

    if ((retval = krb5_os_localaddr(&my_addresses))) {
	fprintf(stderr, "Unable to Get Customers Address\n");
	return(1);
    }

    memset((char *) my_creds, 0, sizeof(krb5_creds));

    my_creds->client = client;                           
 
    if ((retval = krb5_build_principal_ext(context, &my_creds->server,
                                        client->realm.length, 
					client->realm.data,
                                        cpwname.length,		/* 6 */ 
					cpwname.data,		/* "kadmin" */
                                        client->realm.length,  
					   /* instance is local realm */
					client->realm.data,
                                        0))) {
        fprintf(stderr, "Error %s while building server name\n",
		error_message(retval));
        return(1);
    }


    if ((old_password = (char *) calloc (1, 255)) == NULL) {
	fprintf(stderr, "No Memory for Retrieving old password\n");
	return(1);
    }

    old_pwsize = 255;
    if ((retval = krb5_read_password(context, 
                                prompt,
                                0,
                                old_password,
                                &old_pwsize))) {
	fprintf(stderr, "Error while reading password for '%s'",
                                client_name);
	return(1);
    }

    retval = krb5_get_in_tkt_with_password(context, 0,/* options */
					my_addresses, 
					NULL, /* Default encryption list */
                                        NULL, /* Default preauth list */
					old_password, cache, my_creds, 0);
	
    if (retval) {
	fprintf(stderr, "\nUnable to Get Initial Credentials : %s %d\n",
		error_message(retval),retval);
    }

	/* Do NOT Forget to zap password  */
    memset((char *) old_password, 0, old_pwsize);
    free(old_password);
    memset((char *) pword, 0, sizeof(pword));
    return(retval);
}

#ifdef MACH_PASS /* Machine-generated Passwords */
krb5_error_code
print_and_choose_password(new_password, decodable_pwd_string)
    char * new_password;
    krb5_data * decodable_pwd_string;
{
krb5_error_code retval;
   krb5_pwd_data *pwd_data;
   passwd_phrase_element **next_passwd_phrase_element;
   char prompt[255];
   int i, j, k;
   int legit_pswd = 0;	/* Assume No Legitimate Password */
   char *password_list[ADM_MAX_PW_CHOICES];
   char verification_passwd[ADM_MAX_PW_LENGTH+1];
   /* char new_passwd[ADM_MAX_PW_LENGTH]; */
   char phrase_in[ADM_MAX_PHRASE_LENGTH];
   int new_passwd_length;
   char *ptr;
   int verify = 0;	/* Do Not Request Password Selection Verification */ 
   int ok = 0;

#define free_local_password_list() \
{  for ( k = 0; k < i && k < ADM_MAX_PW_CHOICES; k++) { \
      (void) memset(password_list[k], 0, ADM_MAX_PW_LENGTH); \
      free(password_list[k]); } \
}

     /* Decode Password and Phrase Information Obtained from krb5_rd_priv */
   if ((retval = decode_krb5_pwd_data(decodable_pwd_string , &pwd_data))) { 
	fprintf(stderr, "Unable to Decode Passwords and Phrases\n");
        fprintf(stderr, "	Notify your System Administrator or the ");
	fprintf(stderr, "Kerberos Administrator\n");
	return(1);
   }

   next_passwd_phrase_element = pwd_data->element;
	/* Display List in 5 Password/Phrase Increments up to MAX Iterations */
   memset((char *) phrase_in, 0, ADM_MAX_PHRASE_LENGTH);
   for ( j = 0; j <= ADM_MAX_PW_ITERATIONS; j++) {
	if (j == ADM_MAX_PW_ITERATIONS) {
	    fprintf(stderr, "\n\nSorry - You Have Exceeded the List of ");
	    fprintf(stderr, "Choices (%d) Allowed for Password\n",
			ADM_MAX_PW_ITERATIONS * ADM_MAX_PW_CHOICES);
	    fprintf(stderr, "	Modification.  You Must Repeat this ");
	    fprintf(stderr, "Operation in order to Successfully\n");
	    fprintf(stderr, "	Change your Password.\n");
	    break;
	}

	display_print:
	printf("\n\nChoose a password from the following list:\n");

	printf("\n\nPassword                        Remembrance Aid\n\n\n");

		/* Print Passwords and Assistance Phrases List */
	for ( i = 0; i < ADM_MAX_PW_CHOICES; i++){
	    if ((password_list[i] = (char *) calloc (1, 
			ADM_MAX_PW_LENGTH + 1)) == NULL) {
		fprintf(stderr, "Unable to Allocate Password List.\n");
		return(1);
	    }

	    memcpy(password_list[i],
		(*next_passwd_phrase_element)->passwd->data,
		(*next_passwd_phrase_element)->passwd->length);
	    printf("%s	", password_list[i]);

	    memcpy((char *) phrase_in,
		(*next_passwd_phrase_element)->phrase->data,
		(*next_passwd_phrase_element)->phrase->length);
	    for ( k = 0; 
		  k < 50 && k < (*next_passwd_phrase_element)->phrase->length; 
		  k++) {
		printf("%c", phrase_in[k]);
	    }
	    for ( k = k;
		  k < 70 && k < (*next_passwd_phrase_element)->phrase->length;
		  k++) {
		if (phrase_in[k] == ' ') {
		    printf("\n		");
		    k++;
		    break;
		} else {
		    printf("%c", phrase_in[k]);
		}
	    }
	    for ( k = k;
		  k < (*next_passwd_phrase_element)->phrase->length;
		  k++) {
		printf("%c", phrase_in[k]);
	    }
	    printf("\n\n");
	    memset((char *) phrase_in, 0, ADM_MAX_PHRASE_LENGTH);
	    next_passwd_phrase_element++;
	}

	    sprintf(prompt, 
		"\n\nEnter Password Selection or a <CR> to get new list: ");

	    new_passwd_length = ADM_MAX_PW_LENGTH+1;
	/* Read New Password from Terminal (Do Not Print on Screen) */
	    if ((retval = krb5_read_password(context, &prompt[0], 0, 
			new_password, &new_passwd_length))) {
		fprintf(stderr, 
		    "\nError Reading Password Input or Input Aborted\n");
		free_local_password_list();
		break;;
	    }

	/* Check for <CR> ==> Provide a New List */
	    if (new_passwd_length == 0) continue;

	/* Check that Selection is from List - Server also does this */
	    legit_pswd = 0;
	    for (i = 0; i < ADM_MAX_PW_CHOICES && !legit_pswd; i++)
		if ((retval = memcmp(new_password, 
				password_list[i], 8)) == 0) {
		    legit_pswd++;
		}
	    free_local_password_list();

	    if (!(legit_pswd)) {
	 	printf("\n\07\07Password must be from the specified list ");
        	printf("- Try Again!\n");
	    }

	    if (legit_pswd) break;	/* Exit Loop */
	}		/* ADM_MAX_PW_CHOICES Loop */

   if (!(legit_pswd)) return (1);

   return(0);		/* SUCCESS */
}
#endif

static krb5_error_code
adm5_init_link(context, realm_of_server, local_socket)
    krb5_context context;
    krb5_data *realm_of_server;
    int * local_socket;
{
    struct servent *service_process;	       /* service we will talk to */
    struct hostent *remote_host;	       /* host we will talk to */

    char **hostlist;

    int host_count;
    int namelen;
    int i, count;

    krb5_error_code retval;

    /* clear out the structure first */
    (void) memset((char *)&remote_sin, 0, sizeof(remote_sin));

    if ((service_process = getservbyname(CPW_SNAME, "tcp")) == NULL) {
	fprintf(stderr, "Unable to find Service (%s) Check services file\n",
		CPW_SNAME);
	return(1);
    }

    		/* Copy the Port Number */
    remote_sin.sin_port = service_process->s_port;

    hostlist = 0;

		/* Identify all Hosts Associated with this Realm */
    if ((retval = krb5_get_krbhst (context, realm_of_server, &hostlist))) {
        fprintf(stderr, "krb5_get_krbhst: Unable to Determine Server Name\n");
        return(1);
    }

    for (i=0; hostlist[i]; i++);
 
    count = i;

    if (count == 0) {
        host_count = 0;
        fprintf(stderr, "No hosts found\n");
        return(1);
    }

    for (i=0; hostlist[i]; i++) {
        remote_host = gethostbyname(hostlist[i]);
        if (remote_host != 0) {

		/* set up the address of the foreign socket for connect() */
	    remote_sin.sin_family = remote_host->h_addrtype;
	    (void) memcpy((char *) &remote_sin.sin_addr, 
			(char *) remote_host->h_addr,
			sizeof(remote_host->h_addr));
	    break;	/* Only Need one */
	}
    }

    free ((char *)hostlist);

    /* open a TCP socket */
    *local_socket = socket(PF_INET, SOCK_STREAM, 0);
    if (*local_socket < 0) {
	fprintf(stderr, "Cannot Open Socket\n");
	return(1);
    }
    /* connect to the server */
    if (connect(*local_socket, &remote_sin, sizeof(remote_sin)) < 0) {
	fprintf(stderr, "Cannot Connect to Socket\n");
	close(*local_socket);
	return(1);
    }

    /* find out who I am, now that we are connected and therefore bound */
    namelen = sizeof(local_sin);
    if (getsockname(*local_socket, 
		(struct sockaddr *) &local_sin, &namelen) < 0) {
	fprintf(stderr, "Cannot Perform getsockname\n");
	close(*local_socket);
	return(1);
    }
	return(0);
}

usage()
{
    fprintf(stderr, "Usage: ");
    fprintf(stderr, "kpasswd [name]\n");
    exit(0);
}