/*	$OpenBSD: rpcinfo.c,v 1.14 2010/09/01 14:43:34 millert Exp $	*/

/*
 * Copyright (c) 2010, Oracle America, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 *       copyright notice, this list of conditions and the following
 *       disclaimer in the documentation and/or other materials
 *       provided with the distribution.
 *     * Neither the name of the "Oracle America, Inc." nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 *   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 *   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 *   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 *   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * rpcinfo: ping a particular rpc program
 *     or dump the portmapper
 */

#include <rpc/rpc.h>
#include <stdio.h>
#include <sys/socket.h>
#include <netdb.h>
#include <rpc/pmap_prot.h>
#include <rpc/pmap_clnt.h>
#include <signal.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <arpa/inet.h>

#define MAXHOSTLEN 256

#define	MIN_VERS	((u_long) 0)
#define	MAX_VERS	((u_long) 4294967295UL)

void	udpping(u_short portflag, int argc, char **argv);
void	tcpping(u_short portflag, int argc, char **argv);
int	pstatus(CLIENT *client, u_long prognum, u_long vers);
void	pmapdump(int argc, char **argv);
bool_t	reply_proc(caddr_t res, struct sockaddr_in *who);
void	brdcst(int argc, char **argv);
void	deletereg(int argc, char **argv);
void	setreg(int argc, char **argv);
void	usage(char *);
int	getprognum(char *arg, u_long *ulp);
int	getul(char *arg, u_long *ulp);
void	get_inet_address(struct sockaddr_in *addr, char *host);

/*
 * Functions to be performed.
 */
#define	NONE		0	/* no function */
#define	PMAPDUMP	1	/* dump portmapper registrations */
#define	TCPPING		2	/* ping TCP service */
#define	UDPPING		3	/* ping UDP service */
#define	BRDCST		4	/* ping broadcast UDP service */
#define DELETES		5	/* delete registration for the service */
#define SETS		6	/* set registration for the service */

int
main(int argc, char *argv[])
{
	int c;
	extern char *optarg;
	extern int optind;
	int errflg;
	int function;
	u_short portnum;
	u_long tmp;

	function = NONE;
	portnum = 0;
	errflg = 0;
	while ((c = getopt(argc, argv, "ptubdsn:")) != -1) {
		switch (c) {

		case 'p':
			if (function != NONE)
				errflg = 1;
			else
				function = PMAPDUMP;
			break;

		case 't':
			if (function != NONE)
				errflg = 1;
			else
				function = TCPPING;
			break;

		case 'u':
			if (function != NONE)
				errflg = 1;
			else
				function = UDPPING;
			break;

		case 'b':
			if (function != NONE)
				errflg = 1;
			else
				function = BRDCST;
			break;

		case 'n':
			if (getul(optarg, &tmp))
				usage("invalid port number");
			if (tmp >= 65536)
				usage("port number out of range");
			portnum = (u_short)tmp;
			break;

		case 'd':
			if (function != NONE)
				errflg = 1;
			else
				function = DELETES;
			break;

		case 's':
			if (function != NONE)
				errflg = 1;
			else
				function = SETS;
			break;


		case '?':
			errflg = 1;
		}
	}

	if (errflg || function == NONE)
		usage(NULL);

	switch (function) {

	case PMAPDUMP:
		if (portnum != 0)
			usage(NULL);
		pmapdump(argc - optind, argv + optind);
		break;

	case UDPPING:
		udpping(portnum, argc - optind, argv + optind);
		break;

	case TCPPING:
		tcpping(portnum, argc - optind, argv + optind);
		break;

	case BRDCST:
		if (portnum != 0)
			usage(NULL);

		brdcst(argc - optind, argv + optind);
		break;

	case DELETES:
		deletereg(argc - optind, argv + optind);
		break;

	case SETS:
		setreg(argc - optind, argv + optind);
		break;
	}

	return (0);
}
		
void
udpping(u_short portnum, int argc, char **argv)
{
	struct timeval to;
	struct sockaddr_in addr;
	enum clnt_stat rpc_stat;
	CLIENT *client;
	u_long prognum, vers, minvers, maxvers;
	int sock = RPC_ANYSOCK;
	struct rpc_err rpcerr;
	int failure;
    
	if (argc < 2)
		usage("too few arguments");
	if (argc > 3)
		usage("too many arguments");
	if (getprognum(argv[1], &prognum))
		usage("program number out of range");

	get_inet_address(&addr, argv[0]);
	/* Open the socket here so it will survive calls to clnt_destroy */
	sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
	if (sock < 0) {
		perror("rpcinfo: socket");
		exit(1);
	}
	if (getuid() == 0)
		bindresvport(sock, NULL);
	failure = 0;
	if (argc == 2) {
		/*
		 * A call to version 0 should fail with a program/version
		 * mismatch, and give us the range of versions supported.
		 */
		addr.sin_port = htons(portnum);
		to.tv_sec = 5;
		to.tv_usec = 0;
		if ((client = clntudp_create(&addr, prognum, (u_long)0,
		    to, &sock)) == NULL) {
			clnt_pcreateerror("rpcinfo");
			printf("program %lu is not available\n",
			    prognum);
			exit(1);
		}
		to.tv_sec = 10;
		to.tv_usec = 0;
		rpc_stat = clnt_call(client, NULLPROC, xdr_void, (char *)NULL,
		    xdr_void, (char *)NULL, to);
		if (rpc_stat == RPC_PROGVERSMISMATCH) {
			clnt_geterr(client, &rpcerr);
			minvers = rpcerr.re_vers.low;
			maxvers = rpcerr.re_vers.high;
		} else if (rpc_stat == RPC_SUCCESS) {
			/*
			 * Oh dear, it DOES support version 0.
			 * Let's try version MAX_VERS.
			 */
			addr.sin_port = htons(portnum);
			to.tv_sec = 5;
			to.tv_usec = 0;
			if ((client = clntudp_create(&addr, prognum, MAX_VERS,
			    to, &sock)) == NULL) {
				clnt_pcreateerror("rpcinfo");
				printf("program %lu version %lu is not available\n",
				    prognum, MAX_VERS);
				exit(1);
			}
			to.tv_sec = 10;
			to.tv_usec = 0;
			rpc_stat = clnt_call(client, NULLPROC, xdr_void,
			    (char *)NULL, xdr_void, (char *)NULL, to);
			if (rpc_stat == RPC_PROGVERSMISMATCH) {
				clnt_geterr(client, &rpcerr);
				minvers = rpcerr.re_vers.low;
				maxvers = rpcerr.re_vers.high;
			} else if (rpc_stat == RPC_SUCCESS) {
				/*
				 * It also supports version MAX_VERS.
				 * Looks like we have a wise guy.
				 * OK, we give them information on all
				 * 4 billion versions they support...
				 */
				minvers = 0;
				maxvers = MAX_VERS;
			} else {
				(void) pstatus(client, prognum, MAX_VERS);
				exit(1);
			}
		} else {
			(void) pstatus(client, prognum, (u_long)0);
			exit(1);
		}
		clnt_destroy(client);
		for (vers = minvers; vers <= maxvers; vers++) {
			addr.sin_port = htons(portnum);
			to.tv_sec = 5;
			to.tv_usec = 0;
			if ((client = clntudp_create(&addr, prognum, vers,
			    to, &sock)) == NULL) {
				clnt_pcreateerror("rpcinfo");
				printf("program %lu version %lu is not available\n",
				    prognum, vers);
				exit(1);
			}
			to.tv_sec = 10;
			to.tv_usec = 0;
			rpc_stat = clnt_call(client, NULLPROC, xdr_void,
			    (char *)NULL, xdr_void, (char *)NULL, to);
			if (pstatus(client, prognum, vers) < 0)
				failure = 1;
			clnt_destroy(client);
		}
	} else {
		getul(argv[2], &vers);		/* XXX */
		addr.sin_port = htons(portnum);
		to.tv_sec = 5;
		to.tv_usec = 0;
		if ((client = clntudp_create(&addr, prognum, vers,
		    to, &sock)) == NULL) {
			clnt_pcreateerror("rpcinfo");
			printf("program %lu version %lu is not available\n",
			    prognum, vers);
			exit(1);
		}
		to.tv_sec = 10;
		to.tv_usec = 0;
		rpc_stat = clnt_call(client, 0, xdr_void, (char *)NULL,
		    xdr_void, (char *)NULL, to);
		if (pstatus(client, prognum, vers) < 0)
			failure = 1;
	}
	(void) close(sock); /* Close it up again */
	if (failure)
		exit(1);
}

void
tcpping(u_short portnum, int argc, char **argv)
{
	struct timeval to;
	struct sockaddr_in addr;
	enum clnt_stat rpc_stat;
	CLIENT *client;
	u_long prognum, vers, minvers, maxvers;
	int sock = RPC_ANYSOCK;
	struct rpc_err rpcerr;
	int failure;

	if (argc < 2)
		usage("too few arguments");
	if (argc > 3)
		usage("too many arguments");
	if (getprognum(argv[1], &prognum))
		usage("program number out of range");

	get_inet_address(&addr, argv[0]);
	failure = 0;
	if (argc == 2) {
		/*
		 * A call to version 0 should fail with a program/version
		 * mismatch, and give us the range of versions supported.
		 */
		addr.sin_port = htons(portnum);
		if ((client = clnttcp_create(&addr, prognum, MIN_VERS,
		    &sock, 0, 0)) == NULL) {
			clnt_pcreateerror("rpcinfo");
			printf("program %lu is not available\n",
			    prognum);
			exit(1);
		}
		to.tv_sec = 10;
		to.tv_usec = 0;
		rpc_stat = clnt_call(client, NULLPROC, xdr_void, (char *)NULL,
		    xdr_void, (char *)NULL, to);
		if (rpc_stat == RPC_PROGVERSMISMATCH) {
			clnt_geterr(client, &rpcerr);
			minvers = rpcerr.re_vers.low;
			maxvers = rpcerr.re_vers.high;
		} else if (rpc_stat == RPC_SUCCESS) {
			/*
			 * Oh dear, it DOES support version 0.
			 * Let's try version MAX_VERS.
			 */
			addr.sin_port = htons(portnum);
			if ((client = clnttcp_create(&addr, prognum, MAX_VERS,
			    &sock, 0, 0)) == NULL) {
				clnt_pcreateerror("rpcinfo");
				printf("program %lu version %lu is not available\n",
				    prognum, MAX_VERS);
				exit(1);
			}
			to.tv_sec = 10;
			to.tv_usec = 0;
			rpc_stat = clnt_call(client, NULLPROC, xdr_void,
			    (char *)NULL, xdr_void, (char *)NULL, to);
			if (rpc_stat == RPC_PROGVERSMISMATCH) {
				clnt_geterr(client, &rpcerr);
				minvers = rpcerr.re_vers.low;
				maxvers = rpcerr.re_vers.high;
			} else if (rpc_stat == RPC_SUCCESS) {
				/*
				 * It also supports version MAX_VERS.
				 * Looks like we have a wise guy.
				 * OK, we give them information on all
				 * 4 billion versions they support...
				 */
				minvers = 0;
				maxvers = MAX_VERS;
			} else {
				(void) pstatus(client, prognum, MAX_VERS);
				exit(1);
			}
		} else {
			(void) pstatus(client, prognum, MIN_VERS);
			exit(1);
		}
		clnt_destroy(client);
		(void) close(sock);
		sock = RPC_ANYSOCK; /* Re-initialize it for later */
		for (vers = minvers; vers <= maxvers; vers++) {
			addr.sin_port = htons(portnum);
			if ((client = clnttcp_create(&addr, prognum, vers,
			    &sock, 0, 0)) == NULL) {
				clnt_pcreateerror("rpcinfo");
				printf("program %lu version %lu is not available\n",
				    prognum, vers);
				exit(1);
			}
			to.tv_usec = 0;
			to.tv_sec = 10;
			rpc_stat = clnt_call(client, 0, xdr_void, (char *)NULL,
			    xdr_void, (char *)NULL, to);
			if (pstatus(client, prognum, vers) < 0)
				failure = 1;
			clnt_destroy(client);
			(void) close(sock);
			sock = RPC_ANYSOCK;
		}
	} else {
		getul(argv[2], &vers);		/* XXX */
		addr.sin_port = htons(portnum);
		if ((client = clnttcp_create(&addr, prognum, vers, &sock,
		    0, 0)) == NULL) {
			clnt_pcreateerror("rpcinfo");
			printf("program %lu version %lu is not available\n",
			    prognum, vers);
			exit(1);
		}
		to.tv_usec = 0;
		to.tv_sec = 10;
		rpc_stat = clnt_call(client, 0, xdr_void, (char *)NULL,
		    xdr_void, (char *)NULL, to);
		if (pstatus(client, prognum, vers) < 0)
			failure = 1;
	}
	if (failure)
		exit(1);
}

/*
 * This routine should take a pointer to an "rpc_err" structure, rather than
 * a pointer to a CLIENT structure, but "clnt_perror" takes a pointer to
 * a CLIENT structure rather than a pointer to an "rpc_err" structure.
 * As such, we have to keep the CLIENT structure around in order to print
 * a good error message.
 */
int
pstatus(CLIENT *client, u_long prognum, u_long vers)
{
	struct rpc_err rpcerr;

	clnt_geterr(client, &rpcerr);
	if (rpcerr.re_status != RPC_SUCCESS) {
		clnt_perror(client, "rpcinfo");
		printf("program %lu version %lu is not available\n",
		    prognum, vers);
		return (-1);
	} else {
		printf("program %lu version %lu ready and waiting\n",
		    prognum, vers);
		return (0);
	}
}

void
pmapdump(int argc, char **argv)
{
	struct sockaddr_in server_addr;
	struct hostent *hp;
	struct pmaplist *head = NULL;
	int socket = RPC_ANYSOCK;
	struct timeval minutetimeout;
	CLIENT *client;
	struct rpcent *rpc;
	
	if (argc > 1)
		usage("too many arguments");

	if (argc == 1)
		get_inet_address(&server_addr, argv[0]);
	else {
		bzero((char *)&server_addr, sizeof server_addr);
		server_addr.sin_family = AF_INET;
		if ((hp = gethostbyname("localhost")) != NULL)
			bcopy(hp->h_addr, (caddr_t)&server_addr.sin_addr,
			    hp->h_length);
		else
			(void) inet_aton("0.0.0.0", &server_addr.sin_addr);
	}
	minutetimeout.tv_sec = 60;
	minutetimeout.tv_usec = 0;
	server_addr.sin_port = htons(PMAPPORT);
	if ((client = clnttcp_create(&server_addr, PMAPPROG,
	    PMAPVERS, &socket, 50, 500)) == NULL) {
		clnt_pcreateerror("rpcinfo: can't contact portmapper");
		exit(1);
	}
	if (clnt_call(client, PMAPPROC_DUMP, xdr_void, NULL,
	    xdr_pmaplist, &head, minutetimeout) != RPC_SUCCESS) {
		fprintf(stderr, "rpcinfo: can't contact portmapper: ");
		clnt_perror(client, "rpcinfo");
		exit(1);
	}
	if (head == NULL) {
		printf("No remote programs registered.\n");
	} else {
		printf("   program vers proto   port\n");
		for (; head != NULL; head = head->pml_next) {
			printf("%10ld%5ld",
			    head->pml_map.pm_prog,
			    head->pml_map.pm_vers);
			if (head->pml_map.pm_prot == IPPROTO_UDP)
				printf("%6s",  "udp");
			else if (head->pml_map.pm_prot == IPPROTO_TCP)
				printf("%6s", "tcp");
			else
				printf("%6ld",  head->pml_map.pm_prot);
			printf("%7ld",  head->pml_map.pm_port);
			rpc = getrpcbynumber(head->pml_map.pm_prog);
			if (rpc)
				printf("  %s\n", rpc->r_name);
			else
				printf("\n");
		}
	}
}

/* 
 * reply_proc collects replies from the broadcast. 
 * to get a unique list of responses the output of rpcinfo should
 * be piped through sort(1) and then uniq(1).
 */
/*ARGSUSED*/
bool_t
reply_proc(caddr_t res, struct sockaddr_in *who)
{
	struct hostent *hp;

	hp = gethostbyaddr((char *) &who->sin_addr, sizeof who->sin_addr,
	    AF_INET);
	printf("%s %s\n", inet_ntoa(who->sin_addr),
	    (hp == NULL) ? "(unknown)" : hp->h_name);
	return(FALSE);
}

void
brdcst(int argc, char **argv)
{
	enum clnt_stat rpc_stat;
	u_long prognum, vers_num;

	if (argc != 2)
		usage("incorrect number of arguments");
	if (getprognum(argv[1], &prognum))
		usage("program number out of range");
	if (getul(argv[1], &vers_num))
		usage("version number out of range");
		
	rpc_stat = clnt_broadcast(prognum, vers_num, NULLPROC, xdr_void,
	    (char *)NULL, xdr_void, (char *)NULL, reply_proc);
	if ((rpc_stat != RPC_SUCCESS) && (rpc_stat != RPC_TIMEDOUT)) {
		fprintf(stderr, "rpcinfo: broadcast failed: %s\n",
		    clnt_sperrno(rpc_stat));
		exit(1);
	}
	exit(0);
}

void
deletereg(int argc, char **argv)
{
	u_long prog_num, version_num;

	if (argc != 2)
		usage("incorrect number of arguments");
	if (getprognum(argv[0], &prog_num))
		usage("program number out of range");
	if (getul(argv[1], &version_num))
		usage("version number out of range");

	if ((pmap_unset(prog_num, version_num)) == 0) {
		fprintf(stderr, "rpcinfo: Could not delete "
		    "registration for prog %s version %s\n",
		    argv[0], argv[1]);
		exit(1);
	}
}

void
setreg(int argc, char **argv)
{
	u_long prog_num, version_num, port_num;

	if (argc != 3)
		usage("incorrect number of arguments");
	if (getprognum(argv[0], &prog_num))
		usage("cannot parse program number");
	if (getul(argv[1], &version_num))
		usage("cannot parse version number");
	if (getul(argv[2], &port_num))
		usage("cannot parse port number");
	if (port_num >= 65536)
		usage("port number out of range");
		
	if ((pmap_set(prog_num, version_num, IPPROTO_TCP,
	    (u_short)port_num)) == 0) {
		fprintf(stderr, "rpcinfo: Could not set registration "
		    "for prog %s version %s port %s protocol IPPROTO_TCP\n",
		    argv[0], argv[1], argv[2]);
		exit(1);
	}
	if ((pmap_set(prog_num, version_num, IPPROTO_UDP,
	    (u_short)port_num)) == 0) {
		fprintf(stderr, "rpcinfo: Could not set registration "
		    "for prog %s version %s port %s protocol IPPROTO_UDP\n",
		    argv[0], argv[1], argv[2]);
		exit(1);
	}
}

void
usage(char *msg)
{
	if (msg)
		fprintf(stderr,
		    "rpcinfo: %s\n", msg);
	fprintf(stderr, "usage: rpcinfo -b program version\n");
	fprintf(stderr, "       rpcinfo -d program version\n");
	fprintf(stderr, "       rpcinfo -p [host]\n");
	fprintf(stderr, "       rpcinfo -s program version port\n");
	fprintf(stderr,
	    "       rpcinfo [-n portnum] -t host program [version]\n");
	fprintf(stderr,
	    "       rpcinfo [-n portnum] -u host program [version]\n");
	exit(1);
}

int
getprognum(char *arg, u_long *ulp)
{
	struct rpcent *rpc;

	if (isalpha(*arg)) {
		rpc = getrpcbyname(arg);
		if (rpc == NULL) {
			fprintf(stderr, "rpcinfo: %s is unknown service\n",
			    arg);
			exit(1);
		}
		*ulp = rpc->r_number;
		return 0;
	}
	return getul(arg, ulp);
}

int
getul(char *arg, u_long *ulp)
{
	u_long ul;
	int save_errno = errno;
	char *ep;
	int ret = 1;

	errno = 0;
	ul = strtoul(arg, &ep, 10);
	if (arg[0] == '\0' || *ep != '\0')
		goto fail;
	if (errno == ERANGE && ul == ULONG_MAX)
		goto fail;
	*ulp = ul;
	ret = 0;
fail:
	errno = save_errno;
	return (ret);
}

void
get_inet_address(struct sockaddr_in *addr, char *host)
{
	struct hostent *hp;

	bzero((char *)addr, sizeof *addr);
	if (inet_aton(host, &addr->sin_addr) == 0) {
		if ((hp = gethostbyname(host)) == NULL) {
			fprintf(stderr, "rpcinfo: %s is unknown host\n",
			    host);
			exit(1);
		}
		bcopy(hp->h_addr, (char *)&addr->sin_addr, hp->h_length);
	}
	addr->sin_family = AF_INET;
}