File ipv6-usagi-20010122.diff of Package ftp

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File ipv6-usagi-20010122.diff of Package ftp

--- netkit-combo/netkit-ftp/ftp/cmds.c:1.1.1.1	Sat Nov  4 04:18:15 2000
+++ netkit-combo/netkit-ftp/ftp/cmds.c	Sat Jan 13 06:36:27 2001
@@ -190,7 +192,7 @@
 setpeer(int argc, char *argv[])
 {
 	char *host;
-	unsigned short port;
+	char *port;
 
 	if (connected) {
 		printf("Already connected to %s, use close first.\n",
@@ -205,22 +207,17 @@
 		code = -1;
 		return;
 	}
-	port = ftp_port;
+	port = NULL;
 	if (argc > 2) {
-		port = atoi(argv[2]);
-		if (port < 1) {
-			printf("%s: bad port number-- %s\n", argv[1], argv[2]);
-			printf ("usage: %s host-name [port]\n", argv[0]);
-			code = -1;
-			return;
-		}
-		port = htons(port);
+		port = argv[2];
 	}
 	host = hookup(argv[1], port);
 	if (host) {
 		int overbose;
 
 		connected = 1;
+		try_epsv = 1;
+		try_eprt = 1;
 		/*
 		 * Set up defaults for FTP.
 		 */
--- netkit-combo/netkit-ftp/ftp/ftp.c:1.1.1.1	Sat Nov  4 04:18:15 2000
+++ netkit-combo/netkit-ftp/ftp/ftp.c	Sat Jan 13 06:36:27 2001
@@ -65,12 +96,26 @@
 
 #include "../version.h"
 
+union sockunion {
+	struct sockinet {
+		u_short	si_family;
+		u_short	si_port;
+	} su_si;
+	struct	sockaddr		su_sa;
+	struct	sockaddr_in  		su_sin;
+	struct	sockaddr_in6 		su_sin6;
+};
+#define	su_family	su_sa.sa_family
+#define	su_port		su_si.si_port
+
+#define ex_af2prot(a) (a == AF_INET ? 1 : (a == AF_INET6 ? 2 : 0))
+
 int data = -1;
 off_t restart_point = 0;
 
-static struct sockaddr_in hisctladdr;
-static struct sockaddr_in data_addr;
-static struct sockaddr_in myctladdr;
+static union sockunion hisctladdr;
+static union sockunion data_addr;
+static union sockunion myctladdr;
 static int ptflag = 0;
 static sigjmp_buf recvabort;
 static sigjmp_buf sendabort;
@@ -96,79 +147,119 @@
 static FILE *dataconn(const char *);
 
 char *
-hookup(char *host, int port)
+hookup(const char *host, const char *port)
 {
-	register struct hostent *hp = 0;
-	int s, tos;
+	int s, tos, error;
 	socklen_t len;
 	static char hostnamebuf[256];
-
+	struct addrinfo hints, *res, *res0;
+	char hbuf[MAXHOSTNAMELEN], pbuf[NI_MAXSERV];
+	char *cause = "ftp: unknown";
+
+	if (port) {
+		strncpy(pbuf, port, sizeof(pbuf) - 1);
+		pbuf[sizeof(pbuf) - 1] = '\0';
+	} else {
+		sprintf(pbuf, "%d", ntohs(ftp_port));
+	}
 	memset(&hisctladdr, 0, sizeof(hisctladdr));
-	if (inet_aton(host, &hisctladdr.sin_addr)) {
-		hisctladdr.sin_family = AF_INET;
-		strncpy(hostnamebuf, host, sizeof(hostnamebuf));
-		hostnamebuf[sizeof(hostnamebuf)-1]=0;
-	} 
-	else {
-		hp = gethostbyname(host);
-		if (hp == NULL) {
-			fprintf(stderr, "ftp: %s: ", host);
-			herror((char *)NULL);
-			code = -1;
-			return((char *) 0);
+	memset(&hints, 0, sizeof(hints));
+	hints.ai_flags = AI_CANONNAME;
+	hints.ai_socktype = SOCK_STREAM;
+	error = getaddrinfo(host, pbuf, &hints, &res0);
+	if (error) {
+		if (port) {
+			strcpy(hbuf, " ");
+		} else {
+			hbuf[0] = '\0';
+			pbuf[0] = '\0';
 		}
-		hisctladdr.sin_family = hp->h_addrtype;
-		if (hp->h_length > (int)sizeof(hisctladdr.sin_addr)) {
-			hp->h_length = sizeof(hisctladdr.sin_addr);
-		}
-		memcpy(&hisctladdr.sin_addr, hp->h_addr_list[0], hp->h_length);
-		(void) strncpy(hostnamebuf, hp->h_name, sizeof(hostnamebuf));
-		hostnamebuf[sizeof(hostnamebuf)-1] = 0;
-	}
-	hostname = hostnamebuf;
-	s = socket(hisctladdr.sin_family, SOCK_STREAM, 0);
-	if (s < 0) {
-		perror("ftp: socket");
+		fprintf(stderr, "ftp: %s%s%s: %s\n", host, hbuf, pbuf,
+						gai_strerror(error));
 		code = -1;
 		return (0);
 	}
-	hisctladdr.sin_port = port;
-	while (connect(s, (struct sockaddr *)&hisctladdr, sizeof (hisctladdr)) < 0) {
-		if (hp && hp->h_addr_list[1]) {
-			int oerrno = errno;
-
-			fprintf(stderr, "ftp: connect to address %s: ",
-				inet_ntoa(hisctladdr.sin_addr));
-			errno = oerrno;
-			perror((char *) 0);
-			hp->h_addr_list++;
-			memcpy(&hisctladdr.sin_addr, hp->h_addr_list[0], 
-			       hp->h_length);
-			fprintf(stdout, "Trying %s...\n",
-				inet_ntoa(hisctladdr.sin_addr));
-			(void) close(s);
-			s = socket(hisctladdr.sin_family, SOCK_STREAM, 0);
-			if (s < 0) {
-				perror("ftp: socket");
-				code = -1;
-				return (0);
+
+	if (res0->ai_canonname) {
+		struct addrinfo h, *a;
+		memset(&h, 0, sizeof(h));
+		h.ai_family = PF_UNSPEC;
+		h.ai_socktype = SOCK_STREAM;
+		h.ai_flags = AI_NUMERICHOST;
+		if (!getaddrinfo(res0->ai_canonname, NULL, &h, &a)) {
+			strncpy(hostnamebuf, res0->ai_canonname, sizeof(hostnamebuf));
+			freeaddrinfo(a);
+		} else
+			strncpy(hostnamebuf, host, sizeof(hostnamebuf));
+	}
+	else
+		strncpy(hostnamebuf, host, sizeof(hostnamebuf));
+	hostnamebuf[sizeof(hostnamebuf) - 1] = '\0';
+	hostname = hostnamebuf;
+	
+	s = -1;
+	for (res = res0; res; res = res->ai_next) {
+		if (!ex_af2prot(res->ai_family)) {
+			cause = "ftp: mismatch address family";
+			errno = EPROTONOSUPPORT;
+			continue;
+		}
+		if ((size_t)res->ai_addrlen > sizeof(hisctladdr)) {
+			cause = "ftp: mismatch struct sockaddr size";
+			errno = EPROTO;
+			continue;
+		}
+		if (getnameinfo(res->ai_addr, res->ai_addrlen,
+				hbuf, sizeof(hbuf), NULL, 0,
+				NI_NUMERICHOST))
+			strcpy(hbuf, "???");
+		if (res0->ai_next)	/* if we have multiple possibilities */
+			fprintf(stdout, "Trying %s...\n", hbuf);
+		s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
+		if (s < 0) {
+			cause = "ftp: socket";
+			continue;
+		}
+		while ((error = connect(s, res->ai_addr, res->ai_addrlen)) < 0
+				&& errno == EINTR) {
+			;
+		}
+		if (error) {
+			/* this "if" clause is to prevent print warning twice */
+			if (res->ai_next) {
+				fprintf(stderr,
+					"ftp: connect to address %s", hbuf);
+				perror("");
 			}
+			cause = "ftp: connect";
+			close(s);
+			s = -1;
 			continue;
 		}
-		perror("ftp: connect");
+		/* finally we got one */
+		break;
+	}
+	if (s < 0) {
+		perror(cause);
 		code = -1;
-		goto bad;
+		freeaddrinfo(res0);
+		return NULL;
 	}
-	len = sizeof (myctladdr);
+	len = res->ai_addrlen;
+	memcpy(&hisctladdr, res->ai_addr, len);
+	freeaddrinfo(res0);
 	if (getsockname(s, (struct sockaddr *)&myctladdr, &len) < 0) {
 		perror("ftp: getsockname");
 		code = -1;
 		goto bad;
 	}
 #ifdef IP_TOS
+	if (hisctladdr.su_family == AF_INET)
+	{
 	tos = IPTOS_LOWDELAY;
 	if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0)
 		perror("ftp: setsockopt TOS (ignored)");
+	}
 #endif
 	cin = fdopen(s, "r");
 	cout = fdopen(s, "w");
@@ -182,7 +273,7 @@
 		goto bad;
 	}
 	if (verbose)
-		printf("Connected to %s.\n", hostname);
+		printf("Connected to %s (%s).\n", hostname, hbuf);
 	if (getreply(0) > 2) { 	/* read startup message from server */
 		if (cin)
 			(void) fclose(cin);
@@ -392,8 +483,10 @@
 			}
 			if (dig < 4 && isdigit(c))
 				code = code * 10 + (c - '0');
-			if (!pflag && code == 227)
+			if (!pflag && (code == 227 || code == 228))
 				pflag = 1;
+			else if (!pflag && code == 229)
+				pflag = 100;
 			if (dig > 4 && pflag == 1 && isdigit(c))
 				pflag = 2;
 			if (pflag == 2) {
@@ -405,6 +498,8 @@
 					pflag = 3;
 				}
 			}
+			if (pflag == 100 && c == '(')
+				pflag = 2;
 			if (dig == 4 && c == '-') {
 				if (continuation)
 					code = 0;
@@ -1083,15 +1178,23 @@
 static int
 initconn(void)
 {
-	register char *p, *a;
+	u_char *p, *a;
 	int result, tmpno = 0;
 	socklen_t len;
 	int on = 1;
-	int tos;
-	u_long a1,a2,a3,a4,p1,p2;
-
+	int tos, error = 0;
+	u_int ad[16], po[2], af, alen, plen;
+	char *pasvcmd = NULL;
+	char hbuf[MAXHOSTNAMELEN], pbuf[NI_MAXSERV];
+
+	if (myctladdr.su_family == AF_INET6
+	 && (IN6_IS_ADDR_LINKLOCAL(&myctladdr.su_sin6.sin6_addr)
+	  || IN6_IS_ADDR_SITELOCAL(&myctladdr.su_sin6.sin6_addr))) {
+		fprintf(stderr, "use of scoped address can be troublesome\n");
+	}
 	if (passivemode) {
-		data = socket(AF_INET, SOCK_STREAM, 0);
+		data_addr = hisctladdr;
+		data = socket(data_addr.su_family, SOCK_STREAM, 0);
 		if (data < 0) {
 			perror("ftp: socket");
 			return(1);
@@ -1100,52 +1205,197 @@
 		    setsockopt(data, SOL_SOCKET, SO_DEBUG, (char *)&on,
 			       sizeof (on)) < 0)
 			perror("ftp: setsockopt (ignored)");
-		if (command("PASV") != COMPLETE) {
+		switch (data_addr.su_family) {
+		case AF_INET:
+#if 0
+			if (try_epsv) {
+				result = command(pasvcmd = "EPSV 1");
+				if (code / 10 == 22 && code != 229) {
+					fprintf(stderr,
+				  "wrong server: return code must be 229\n");
+					result = COMPLETE + 1;
+				}
+			} else {
+#endif
+			result = COMPLETE + 1;
+
+			if (result != COMPLETE) {
+				try_epsv = 0;
+				result = command(pasvcmd = "PASV");
+			}
+			break;
+		case AF_INET6:
+			if (try_epsv) {
+				result = command(pasvcmd = "EPSV 2");
+				if (code / 10 == 22 && code != 229) {
+					fprintf(stderr,
+				  "wrong server: return code must be 229\n");
+					result = COMPLETE + 1;
+				}
+			} else {
+				result = COMPLETE + 1;
+			}
+			if (result != COMPLETE) {
+				try_epsv = 0;
+				result = command(pasvcmd = "LPSV");
+			}
+			break;
+		default:
+			result = COMPLETE + 1;
+			break;
+		}
+		if (result != COMPLETE) {
 			printf("Passive mode refused.\n");
-			return(1);
+			goto bad;
 		}
 
+#define pack2(var) \
+	(((var[0] & 0xff) << 8) | ((var[1] & 0xff) << 0))
+#define pack4(var) \
+	((((var)[0] & 0xff) << 24) | (((var)[1] & 0xff) << 16) | \
+	 (((var)[2] & 0xff) << 8) | (((var)[3] & 0xff) << 0))
+
 		/*
 		 * What we've got at this point is a string of comma separated
 		 * one-byte unsigned integer values, separated by commas.
-		 * The first four are the an IP address. The fifth is the MSB
-		 * of the port number, the sixth is the LSB. From that we'll
-		 * prepare a sockaddr_in.
 		 */
-
-		if (sscanf(pasv,"%ld,%ld,%ld,%ld,%ld,%ld",
-			   &a1,&a2,&a3,&a4,&p1,&p2)
-		    != 6) 
-		{
-			printf("Passive mode address scan failure. Shouldn't happen!\n");
-			return(1);
+		error = 0;
+		if (strcmp(pasvcmd, "PASV") == 0) {
+			if (data_addr.su_family != AF_INET) {
+				error = 2;
+				goto psv_done;
+			}
+			if (code / 10 == 22 && code != 227) {
+				error = 227;
+				goto psv_done;
+			}
+			if (sscanf(pasv, "%u,%u,%u,%u,%u,%u",
+					&ad[0], &ad[1], &ad[2], &ad[3],
+					&po[0], &po[1]) != 6) {
+				error = 1;
+				goto psv_done;
+			}
+			data_addr.su_sin.sin_addr.s_addr = htonl(pack4(ad));
+			data_addr.su_port = htons(pack2(po));
+		} else
+		    if (strcmp(pasvcmd, "LPSV") == 0) {
+			if (code / 10 == 22 && code != 228) {
+				error = 228;
+				goto psv_done;
+			}
+			switch (data_addr.su_family) {
+			case AF_INET:
+				if (sscanf(pasv, "%u,%u,%u,%u,%u,%u,%u,%u,%u",
+						&af, &alen,
+						&ad[0], &ad[1], &ad[2], &ad[3],
+						&plen, &po[0], &po[1]) != 9) {
+					error = 1;
+					goto psv_done;
+				}
+				if (af != 4 || alen != 4 || plen != 2) {
+					error = 2;
+					goto psv_done;
+				}
+				data_addr.su_sin.sin_addr.s_addr =
+							htonl(pack4(ad));
+				data_addr.su_port = htons(pack2(po));
+				break;
+			case AF_INET6:
+				if (sscanf(pasv,
+	"%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u",
+				  &af, &alen,
+				  &ad[0], &ad[1], &ad[2], &ad[3],
+				  &ad[4], &ad[5], &ad[6], &ad[7],
+				  &ad[8], &ad[9], &ad[10], &ad[11],
+				  &ad[12], &ad[13], &ad[14], &ad[15],
+				  &plen, &po[0], &po[1]) != 21) {
+					error = 1;
+					goto psv_done;
+				}
+				if (af != 6 || alen != 16 || plen != 2) {
+					error = 2;
+					goto psv_done;
+				}
+				data_addr.su_sin6.sin6_addr.s6_addr32[0] =
+							htonl(pack4(ad));
+				data_addr.su_sin6.sin6_addr.s6_addr32[1] =
+							htonl(pack4(ad+4));
+				data_addr.su_sin6.sin6_addr.s6_addr32[2] =
+							htonl(pack4(ad+8));
+				data_addr.su_sin6.sin6_addr.s6_addr32[3] =
+							htonl(pack4(ad+12));
+				data_addr.su_port = htons(pack2(po));
+				break;
+			default:
+				error = 1;
+			}
+		} else if (strncmp(pasvcmd, "EPSV", 4) == 0) {
+			char delim[4];
+			u_int epsvpo;
+
+			if (code / 10 == 22 && code != 229) {
+				error = 229;
+				goto psv_done;
+			}
+			if (sscanf(pasv, "%c%c%c%u%c", &delim[0], &delim[1],
+					&delim[2], &epsvpo, &delim[3]) != 5) {
+				error = 1;
+				goto psv_done;
+			}
+			if (delim[0] != delim[1] || delim[0] != delim[2]
+			 || delim[0] != delim[3]) {
+				error = 1;
+				goto psv_done;
+			}
+			data_addr.su_port = htons(epsvpo);
+		} else {
+			error = 1;
+		}
+psv_done:
+		switch (error) {
+		case 0:
+			break;
+		case 1:
+			fprintf(stderr,
+		  "Passive mode address scan failure. Shouldn't happen!\n");
+			goto bad;
+		case 2:
+			fprintf(stderr,
+			  "Passive mode AF mismatch. Shouldn't happen!\n");
+			goto bad;
+		case 227:
+		case 228:
+		case 229:
+			fprintf(stderr,
+			  "wrong server: return code must be %d\n", error);
+			goto bad;
+		default:
+			fprintf(stderr, "Bug\n");
 		}
 
-		data_addr.sin_family = AF_INET;
-		data_addr.sin_addr.s_addr = htonl((a1 << 24) | (a2 << 16) |
-						  (a3 << 8) | a4);
-		data_addr.sin_port = htons((p1 << 8) | p2);
-
 		if (connect(data, (struct sockaddr *) &data_addr,
 		    sizeof(data_addr))<0) {
 			perror("ftp: connect");
 			return(1);
 		}
 #ifdef IP_TOS
+		if (data_addr.su_family == AF_INET)
+		{
 		tos = IPTOS_THROUGHPUT;
 		if (setsockopt(data, IPPROTO_IP, IP_TOS, (char *)&tos,
 		    sizeof(tos)) < 0)
 			perror("ftp: setsockopt TOS (ignored)");
+		}
 #endif
 		return(0);
 	}
 noport:
 	data_addr = myctladdr;
 	if (sendport)
-		data_addr.sin_port = 0;	/* let system pick one */ 
+		data_addr.su_port = 0;	/* let system pick one */ 
 	if (data != -1)
 		(void) close(data);
-	data = socket(AF_INET, SOCK_STREAM, 0);
+	data = socket(data_addr.su_family, SOCK_STREAM, 0);
 	if (data < 0) {
 		perror("ftp: socket");
 		if (tmpno)
@@ -1172,13 +1426,45 @@
 	if (listen(data, 1) < 0)
 		perror("ftp: listen");
 	if (sendport) {
-		a = (char *)&data_addr.sin_addr;
-		p = (char *)&data_addr.sin_port;
-#define	UC(b)	(((int)b)&0xff)
-		result =
-		    command("PORT %d,%d,%d,%d,%d,%d",
-		      UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
-		      UC(p[0]), UC(p[1]));
+		af = ex_af2prot(data_addr.su_family);
+		if (try_eprt && af > 1) {      /* only IPv6 */
+			if (getnameinfo((struct sockaddr *)&data_addr, len,
+					hbuf, sizeof(hbuf), pbuf, sizeof(pbuf),
+					NI_NUMERICHOST | NI_NUMERICSERV) == 0) {
+				result = command("EPRT |%d|%s|%s|",
+							af, hbuf, pbuf);
+				if (result != COMPLETE) {
+					try_eprt = 0;
+				}
+			} else {
+				result = ERROR;
+			}
+		} else {
+			result = COMPLETE + 1;
+		}
+		if (result == COMPLETE)
+			goto prt_done;
+
+		p = (u_char *)&data_addr.su_port;
+		switch (data_addr.su_family) {
+		case AF_INET:
+			a = (u_char *)&data_addr.su_sin.sin_addr;
+			result = command("PORT %u,%u,%u,%u,%u,%u",
+				a[0], a[1], a[2], a[3], p[0], p[1]);
+			break;
+		case AF_INET6:
+			a = (u_char *)&data_addr.su_sin6.sin6_addr;
+			result = command(
+	"LPRT 6,16,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,2,%d,%d",
+				a[0], a[1], a[2], a[3], a[4], a[5], a[6], a[7],
+				a[8], a[9],a[10],a[11],a[12],a[13],a[14],a[15],
+				p[0], p[1]);
+			break;
+		default:
+			result = COMPLETE + 1; /* xxx */
+		}
+
+	prt_done:
 		if (result == ERROR && sendport == -1) {
 			sendport = 0;
 			tmpno = 1;
@@ -1189,9 +1477,12 @@
 	if (tmpno)
 		sendport = 1;
 #ifdef IP_TOS
+	if (data_addr.su_family == AF_INET)
+	{
 	on = IPTOS_THROUGHPUT;
 	if (setsockopt(data, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0)
 		perror("ftp: setsockopt TOS (ignored)");
+	}
 #endif
 	return (0);
 bad:
@@ -1204,7 +1495,7 @@
 static FILE *
 dataconn(const char *lmode)
 {
-	struct sockaddr_in from;
+	union sockunion from;
 	int s, tos;
 	socklen_t fromlen = sizeof(from);
 
@@ -1220,9 +1511,12 @@
 	(void) close(data);
 	data = s;
 #ifdef IP_TOS
+	if (from.su_family == AF_INET)
+	{
 	tos = IPTOS_THROUGHPUT;
 	if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0)
 		perror("ftp: setsockopt TOS (ignored)");
+	}
 #endif
 	return (fdopen(data, lmode));
 }
@@ -1284,8 +1578,8 @@
 	static struct comvars {
 		int connect;
 		char name[MAXHOSTNAMELEN];
-		struct sockaddr_in mctl;
-		struct sockaddr_in hctl;
+		union sockunion mctl;
+		union sockunion hctl;
 		FILE *in;
 		FILE *out;
 		int tpe;
@@ -1323,7 +1617,7 @@
 	connected = op->connect;
 	if (hostname) {
 		(void) strncpy(ip->name, hostname, sizeof(ip->name) - 1);
-		ip->name[strlen(ip->name)] = '\0';
+		ip->name[sizeof(ip->name) - 1] = '\0';
 	} 
 	else {
 		ip->name[0] = 0;
@@ -1352,18 +1646,18 @@
 	ip->ntflg = ntflag;
 	ntflag = op->ntflg;
 	(void) strncpy(ip->nti, ntin, 16);
-	(ip->nti)[strlen(ip->nti)] = '\0';
+	(ip->nti)[16] = '\0';		/* shouldn't use strlen */
 	(void) strcpy(ntin, op->nti);
 	(void) strncpy(ip->nto, ntout, 16);
-	(ip->nto)[strlen(ip->nto)] = '\0';
+	(ip->nto)[16] = '\0';
 	(void) strcpy(ntout, op->nto);
 	ip->mapflg = mapflag;
 	mapflag = op->mapflg;
 	(void) strncpy(ip->mi, mapin, MAXPATHLEN - 1);
-	(ip->mi)[strlen(ip->mi)] = '\0';
+	(ip->mi)[MAXPATHLEN - 1] = '\0';
 	(void) strcpy(mapin, op->mi);
 	(void) strncpy(ip->mo, mapout, MAXPATHLEN - 1);
-	(ip->mo)[strlen(ip->mo)] = '\0';
+	(ip->mo)[MAXPATHLEN - 1] = '\0';
 	(void) strcpy(mapout, op->mo);
 	(void) signal(SIGINT, oldintr);
 	if (abrtflag) {
--- netkit-combo/netkit-ftp/ftp/ftp_var.h:1.1.1.1	Sat Nov  4 04:18:15 2000
+++ netkit-combo/netkit-ftp/ftp/ftp_var.h	Sat Jan 13 06:36:27 2001
@@ -112,6 +114,8 @@
 Extern int	mflag;		/* flag: if != 0, then active multi command */
 
 Extern int	options;	/* used during socket creation */
+Extern int	try_epsv;	/* try EPSV for this session */
+Extern int	try_eprt;	/* try EPRT for this session */
 
 /*
  * Format of command table.
@@ -140,7 +144,7 @@
 Extern char macbuf[4096];
 #define MACBUF_SIZE 4096
 
-char *hookup(char *host, int port);
+char *hookup(const char *host, const char *port);
 struct cmd *getcmd(const char *);
 char **makeargv(int *pargc, char **parg);
 int dologin(const char *host);

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