[unix-history] / usr / src / usr.bin / rlogin / kcmd.c

/*
 *	$Source: /mit/kerberos/src/appl/bsd/RCS/kcmd.c,v $
 *	$Header: kcmd.c,v 4.16 89/05/17 10:54:31 jtkohl Exp $
 */

#ifndef lint
static char *rcsid_kcmd_c =
"$Header: kcmd.c,v 4.16 89/05/17 10:54:31 jtkohl Exp $";
#endif lint
#define LIBC_SCCS

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "derived from @(#)rcmd.c	5.17 (Berkeley) 6/27/88";
#endif /* LIBC_SCCS and not lint */

#include <stdio.h>
#include <ctype.h>
#include <pwd.h>
#include <sys/param.h>
#include <sys/file.h>
#include <sys/signal.h>
#include <sys/socket.h>
#include <sys/stat.h>

#include <netinet/in.h>

#include <netdb.h>
#include <errno.h>
#include <krb.h>
#include <kparse.h>

#ifndef MAXHOSTNAMELEN 
#define MAXHOSTNAMELEN 64
#endif

extern	errno;
char	*index(), *malloc(), *krb_realmofhost();

#define	START_PORT	5120	 /* arbitrary */

kcmd(sock, ahost, rport, locuser, remuser, cmd, fd2p, ticket, service, realm,
      cred, schedule, msg_data, laddr, faddr, authopts)
int *sock;
char **ahost;
u_short rport;
char *locuser, *remuser, *cmd;
int *fd2p;
KTEXT ticket;
char *service;
char *realm;
CREDENTIALS *cred;
Key_schedule schedule;
MSG_DAT *msg_data;
struct sockaddr_in *laddr, *faddr;
long authopts;
{
	int s, timo = 1, pid;
	long oldmask;
	struct sockaddr_in sin, from;
	char c;
#ifdef ATHENA_COMPAT
	int lport = IPPORT_RESERVED - 1;
#else
	int lport = START_PORT;
#endif ATHENA_COMPAT
	struct hostent *hp;
	int rc;
	char *host_save;
	int status;

	pid = getpid();
	hp = gethostbyname(*ahost);
	if (hp == 0) {
		/* fprintf(stderr, "%s: unknown host\n", *ahost); */
		return (-1);
	}

    host_save = malloc(strlen(hp->h_name) + 1);
    strcpy(host_save, hp->h_name);
    *ahost = host_save;

    /* If realm is null, look up from table */
    if ((realm == NULL) || (realm[0] == '\0')) {
	realm = krb_realmofhost(host_save);
    }

	oldmask = sigblock(sigmask(SIGURG));
	for (;;) {
	s = getport(&lport);
		if (s < 0) {
			if (errno == EAGAIN)
				fprintf(stderr,
					"kcmd(socket): All ports in use\n");
			else
				perror("kcmd: socket");
			sigsetmask(oldmask);
			return (-1);
		}
		fcntl(s, F_SETOWN, pid);
		sin.sin_family = hp->h_addrtype;
#if defined(ultrix) || defined(sun)
		bcopy(hp->h_addr, (caddr_t)&sin.sin_addr, hp->h_length);
#else
		bcopy(hp->h_addr_list[0], (caddr_t)&sin.sin_addr, hp->h_length);
#endif /* defined(ultrix) || defined(sun) */
		sin.sin_port = rport;
		if (connect(s, (struct sockaddr *)&sin, sizeof (sin)) >= 0)
			break;
		(void) close(s);
		if (errno == EADDRINUSE) {
			lport--;
			continue;
		}
	/*
	 * don't wait very long for Kerberos rcmd.
	 */
	if (errno == ECONNREFUSED && timo <= 4) {
			/* sleep(timo); don't wait at all here */
			timo *= 2;
			continue;
		}
#if !(defined(ultrix) || defined(sun))
		if (hp->h_addr_list[1] != NULL) {
			int oerrno = errno;

			fprintf(stderr,
			    "kcmd: connect to address %s: ",
			    inet_ntoa(sin.sin_addr));
			errno = oerrno;
			perror(0);
			hp->h_addr_list++;
			bcopy(hp->h_addr_list[0], (caddr_t)&sin.sin_addr,
			    hp->h_length);
			fprintf(stderr, "Trying %s...\n",
				inet_ntoa(sin.sin_addr));
			continue;
		}
#endif /* !(defined(ultrix) || defined(sun)) */
		if (errno != ECONNREFUSED)
			perror(hp->h_name);
		sigsetmask(oldmask);
		return (-1);
	}
	lport--;
	if (fd2p == 0) {
		write(s, "", 1);
		lport = 0;
	} else {
		char num[8];
	int s2 = getport(&lport), s3;
		int len = sizeof (from);

	if (s2 < 0) {
	    status = -1;
			goto bad;
	}
		listen(s2, 1);
		(void) sprintf(num, "%d", lport);
		if (write(s, num, strlen(num)+1) != strlen(num)+1) {
			perror("kcmd(write): setting up stderr");
			(void) close(s2);
	    status = -1;
			goto bad;
		}
		s3 = accept(s2, (struct sockaddr *)&from, &len);
		(void) close(s2);
		if (s3 < 0) {
			perror("kcmd:accept");
			lport = 0;
			status = -1;
			goto bad;
		}
		*fd2p = s3;
		from.sin_port = ntohs((u_short)from.sin_port);
		if (from.sin_family != AF_INET ||
		    from.sin_port >= IPPORT_RESERVED) {
			fprintf(stderr,
			 "kcmd(socket): protocol failure in circuit setup.\n");
			goto bad2;
		}
	}
    /*
     * Kerberos-authenticated service.  Don't have to send locuser,
     * since its already in the ticket, and we'll extract it on
     * the other side.
     */
    /* (void) write(s, locuser, strlen(locuser)+1); */

    /* set up the needed stuff for mutual auth, but only if necessary */
    if (authopts & KOPT_DO_MUTUAL) {
	int sin_len;
	*faddr = sin;

	sin_len = sizeof (struct sockaddr_in);
	if (getsockname(s, (struct sockaddr *)laddr, &sin_len) < 0) {
	    perror("kcmd(getsockname)");
	    status = -1;
	    goto bad2;
	}
    }
    if ((status = krb_sendauth(authopts, s, ticket, service, *ahost,
			       realm, (unsigned long) getpid(), msg_data,
			       cred, schedule,
			       laddr,
			       faddr,
			       "KCMDV0.1")) != KSUCCESS)
	goto bad2;

	(void) write(s, remuser, strlen(remuser)+1);
	(void) write(s, cmd, strlen(cmd)+1);

    if ((rc=read(s, &c, 1)) != 1) {
	if (rc==-1) {
		perror(*ahost);
	} else {
	    fprintf(stderr,"kcmd: bad connection with remote host\n");
	}
	status = -1;
		goto bad2;
	}
	if (c != 0) {
		while (read(s, &c, 1) == 1) {
			(void) write(2, &c, 1);
			if (c == '\n')
				break;
		}
	status = -1;
		goto bad2;
	}
	sigsetmask(oldmask);
    *sock = s;
    return (KSUCCESS);
bad2:
	if (lport)
		(void) close(*fd2p);
bad:
	(void) close(s);
	sigsetmask(oldmask);
    return (status);
}

getport(alport)
	int *alport;
{
	struct sockaddr_in sin;
	int s;

	sin.sin_family = AF_INET;
	sin.sin_addr.s_addr = INADDR_ANY;
	s = socket(AF_INET, SOCK_STREAM, 0);
	if (s < 0)
		return (-1);
	for (;;) {
		sin.sin_port = htons((u_short)*alport);
		if (bind(s, (struct sockaddr *)&sin, sizeof (sin)) >= 0)
			return (s);
		if (errno != EADDRINUSE) {
			(void) close(s);
			return (-1);
		}
		(*alport)--;
#ifdef ATHENA_COMPAT
		if (*alport == IPPORT_RESERVED/2) {
#else
		if (*alport == IPPORT_RESERVED) {
#endif ATHENA_COMPAT
			(void) close(s);
			errno = EAGAIN;		/* close */
			return (-1);
		}
	}
}
Commit	Line	Data
ed878ac6 KF	1	/*
	2	* $Source: /mit/kerberos/src/appl/bsd/RCS/kcmd.c,v $
	3	* $Header: kcmd.c,v 4.16 89/05/17 10:54:31 jtkohl Exp $
	4	*/
	5
	6	#ifndef lint
	7	static char *rcsid_kcmd_c =
	8	"$Header: kcmd.c,v 4.16 89/05/17 10:54:31 jtkohl Exp $";
	9	#endif lint
	10	#define LIBC_SCCS
	11
	12	/*
	13	* Copyright (c) 1983 Regents of the University of California.
	14	* All rights reserved.
	15	*
	16	* Redistribution and use in source and binary forms are permitted
	17	* provided that the above copyright notice and this paragraph are
	18	* duplicated in all such forms and that any documentation,
	19	* advertising materials, and other materials related to such
	20	* distribution and use acknowledge that the software was developed
	21	* by the University of California, Berkeley. The name of the
	22	* University may not be used to endorse or promote products derived
	23	* from this software without specific prior written permission.
	24	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
	25	* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
	26	* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
	27	*/
	28
	29	#if defined(LIBC_SCCS) && !defined(lint)
	30	static char sccsid[] = "derived from @(#)rcmd.c 5.17 (Berkeley) 6/27/88";
	31	#endif /* LIBC_SCCS and not lint */
	32
	33	#include <stdio.h>
	34	#include <ctype.h>
	35	#include <pwd.h>
	36	#include <sys/param.h>
	37	#include <sys/file.h>
	38	#include <sys/signal.h>
	39	#include <sys/socket.h>
	40	#include <sys/stat.h>
	41
	42	#include <netinet/in.h>
	43
	44	#include <netdb.h>
	45	#include <errno.h>
	46	#include <krb.h>
	47	#include <kparse.h>
	48
	49	#ifndef MAXHOSTNAMELEN
	50	#define MAXHOSTNAMELEN 64
	51	#endif
	52
	53	extern errno;
	54	char index(), malloc(), *krb_realmofhost();
	55
	56	#define START_PORT 5120 /* arbitrary */
	57
	58	kcmd(sock, ahost, rport, locuser, remuser, cmd, fd2p, ticket, service, realm,
	59	cred, schedule, msg_data, laddr, faddr, authopts)
	60	int *sock;
	61	char **ahost;
	62	u_short rport;
	63	char locuser, remuser, *cmd;
	64	int *fd2p;
65	KTEXT ticket;
66	char *service;
67	char *realm;
68	CREDENTIALS *cred;
69	Key_schedule schedule;
70	MSG_DAT *msg_data;
71	struct sockaddr_in laddr, faddr;
72	long authopts;
73	{
74	int s, timo = 1, pid;
75	long oldmask;
76	struct sockaddr_in sin, from;
77	char c;
78	#ifdef ATHENA_COMPAT
79	int lport = IPPORT_RESERVED - 1;
80	#else
81	int lport = START_PORT;
82	#endif ATHENA_COMPAT
83	struct hostent *hp;
84	int rc;
85	char *host_save;
86	int status;
87
88	pid = getpid();
89	hp = gethostbyname(*ahost);
90	if (hp == 0) {
91	/* fprintf(stderr, "%s: unknown host\n", ahost); /
92	return (-1);
93	}
94
95	host_save = malloc(strlen(hp->h_name) + 1);
96	strcpy(host_save, hp->h_name);
97	*ahost = host_save;
98
99	/* If realm is null, look up from table */
100	if ((realm == NULL) \|\| (realm[0] == '\0')) {
101	realm = krb_realmofhost(host_save);
102	}
103
104	oldmask = sigblock(sigmask(SIGURG));
105	for (;;) {
106	s = getport(&lport);
107	if (s < 0) {
108	if (errno == EAGAIN)
5b56bddb KF	109	fprintf(stderr,
5b56bddb KF	110	"kcmd(socket): All ports in use\n");
ed878ac6	111	else
5b56bddb	112	perror("kcmd: socket");
ed878ac6 KF	113	sigsetmask(oldmask);
	114	return (-1);
	115	}
	116	fcntl(s, F_SETOWN, pid);
	117	sin.sin_family = hp->h_addrtype;
	118	#if defined(ultrix) \|\| defined(sun)
	119	bcopy(hp->h_addr, (caddr_t)&sin.sin_addr, hp->h_length);
	120	#else
	121	bcopy(hp->h_addr_list[0], (caddr_t)&sin.sin_addr, hp->h_length);
	122	#endif /* defined(ultrix) \|\| defined(sun) */
	123	sin.sin_port = rport;
	124	if (connect(s, (struct sockaddr *)&sin, sizeof (sin)) >= 0)
	125	break;
	126	(void) close(s);
	127	if (errno == EADDRINUSE) {
	128	lport--;
	129	continue;
	130	}
	131	/*
	132	* don't wait very long for Kerberos rcmd.
	133	*/
	134	if (errno == ECONNREFUSED && timo <= 4) {
5b56bddb	135	/* sleep(timo); don't wait at all here */
ed878ac6 KF	136	timo *= 2;
	137	continue;
	138	}
	139	#if !(defined(ultrix) \|\| defined(sun))
	140	if (hp->h_addr_list[1] != NULL) {
	141	int oerrno = errno;
	142
	143	fprintf(stderr,
5b56bddb KF	144	"kcmd: connect to address %s: ",
5b56bddb KF	145	inet_ntoa(sin.sin_addr));
ed878ac6 KF	146	errno = oerrno;
	147	perror(0);
	148	hp->h_addr_list++;
	149	bcopy(hp->h_addr_list[0], (caddr_t)&sin.sin_addr,
	150	hp->h_length);
	151	fprintf(stderr, "Trying %s...\n",
	152	inet_ntoa(sin.sin_addr));
	153	continue;
	154	}
	155	#endif /* !(defined(ultrix) \|\| defined(sun)) */
	156	if (errno != ECONNREFUSED)
	157	perror(hp->h_name);
	158	sigsetmask(oldmask);
	159	return (-1);
	160	}
	161	lport--;
	162	if (fd2p == 0) {
	163	write(s, "", 1);
	164	lport = 0;
	165	} else {
	166	char num[8];
	167	int s2 = getport(&lport), s3;
	168	int len = sizeof (from);
	169
	170	if (s2 < 0) {
	171	status = -1;
	172	goto bad;
	173	}
	174	listen(s2, 1);
	175	(void) sprintf(num, "%d", lport);
	176	if (write(s, num, strlen(num)+1) != strlen(num)+1) {
5b56bddb	177	perror("kcmd(write): setting up stderr");
ed878ac6 KF	178	(void) close(s2);
	179	status = -1;
	180	goto bad;
	181	}
	182	s3 = accept(s2, (struct sockaddr *)&from, &len);
	183	(void) close(s2);
	184	if (s3 < 0) {
5b56bddb	185	perror("kcmd:accept");
ed878ac6 KF	186	lport = 0;
	187	status = -1;
	188	goto bad;
	189	}
	190	*fd2p = s3;
	191	from.sin_port = ntohs((u_short)from.sin_port);
	192	if (from.sin_family != AF_INET \|\|
	193	from.sin_port >= IPPORT_RESERVED) {
	194	fprintf(stderr,
5b56bddb	195	"kcmd(socket): protocol failure in circuit setup.\n");
ed878ac6 KF	196	goto bad2;
	197	}
	198	}
	199	/*
	200	* Kerberos-authenticated service. Don't have to send locuser,
	201	* since its already in the ticket, and we'll extract it on
	202	* the other side.
	203	*/
	204	/* (void) write(s, locuser, strlen(locuser)+1); */
	205
	206	/* set up the needed stuff for mutual auth, but only if necessary */
	207	if (authopts & KOPT_DO_MUTUAL) {
	208	int sin_len;
	209	*faddr = sin;
	210
	211	sin_len = sizeof (struct sockaddr_in);
	212	if (getsockname(s, (struct sockaddr *)laddr, &sin_len) < 0) {
5b56bddb	213	perror("kcmd(getsockname)");
ed878ac6 KF	214	status = -1;
	215	goto bad2;
	216	}
	217	}
	218	if ((status = krb_sendauth(authopts, s, ticket, service, *ahost,
	219	realm, (unsigned long) getpid(), msg_data,
	220	cred, schedule,
	221	laddr,
	222	faddr,
	223	"KCMDV0.1")) != KSUCCESS)
	224	goto bad2;
	225
	226	(void) write(s, remuser, strlen(remuser)+1);
	227	(void) write(s, cmd, strlen(cmd)+1);
	228
	229	if ((rc=read(s, &c, 1)) != 1) {
	230	if (rc==-1) {
	231	perror(*ahost);
	232	} else {
5b56bddb	233	fprintf(stderr,"kcmd: bad connection with remote host\n");
ed878ac6 KF	234	}
	235	status = -1;
	236	goto bad2;
	237	}
	238	if (c != 0) {
	239	while (read(s, &c, 1) == 1) {
	240	(void) write(2, &c, 1);
	241	if (c == '\n')
	242	break;
	243	}
	244	status = -1;
	245	goto bad2;
	246	}
	247	sigsetmask(oldmask);
	248	*sock = s;
	249	return (KSUCCESS);
	250	bad2:
	251	if (lport)
	252	(void) close(*fd2p);
	253	bad:
	254	(void) close(s);
	255	sigsetmask(oldmask);
	256	return (status);
	257	}
	258
	259	getport(alport)
	260	int *alport;
	261	{
	262	struct sockaddr_in sin;
	263	int s;
	264
	265	sin.sin_family = AF_INET;
	266	sin.sin_addr.s_addr = INADDR_ANY;
	267	s = socket(AF_INET, SOCK_STREAM, 0);
	268	if (s < 0)
	269	return (-1);
	270	for (;;) {
	271	sin.sin_port = htons((u_short)*alport);
	272	if (bind(s, (struct sockaddr *)&sin, sizeof (sin)) >= 0)
	273	return (s);
	274	if (errno != EADDRINUSE) {
	275	(void) close(s);
	276	return (-1);
	277	}
	278	(*alport)--;
	279	#ifdef ATHENA_COMPAT
	280	if (*alport == IPPORT_RESERVED/2) {
	281	#else
	282	if (*alport == IPPORT_RESERVED) {
	283	#endif ATHENA_COMPAT
	284	(void) close(s);
	285	errno = EAGAIN; /* close */
	286	return (-1);
	287	}
	288	}
	289	}
	290