Changes to make telnet & telnetd compile on OS X, and begin adapting them to GNO:

*New makefile
*Refer to local versions of telnet-related headers, rather than system ones
*Use termcap instead of termios
*Change hostname lookup in telnetd back to older code (which assumes IPv4, but that's all GNO supports anyway)

Makefile

@@ -0,0 +1,90 @@
+LIBTELNET_SRCS = \
+  libtelnet/auth.c \
+  libtelnet/enc_des.c \
+  libtelnet/encrypt.c \
+  libtelnet/genget.c \
+  libtelnet/getent.c \
+  libtelnet/kerberos.c \
+  libtelnet/kerberos5.c \
+  libtelnet/krb4encpwd.c \
+  libtelnet/misc.c \
+  libtelnet/read_password.c \
+  libtelnet/rsaencpwd.c \
+  libtelnet/sra.c
+# libtelnet/pk.c 
+
+TELNET_SRCS = \
+  telnet/authenc.c \
+  telnet/commands.c \
+  telnet/main.c \
+  telnet/network.c \
+  telnet/ring.c \
+  telnet/sys_bsd.c \
+  telnet/telnet.c \
+  telnet/terminal.c \
+  telnet/utilities.c
+
+TELNETD_SRCS = \
+  telnetd/authenc.c \
+  telnetd/global.c \
+  telnetd/slc.c \
+  telnetd/state.c \
+  telnetd/sys_term.c \
+  telnetd/telnetd.c \
+  telnetd/termstat.c \
+  telnetd/utility.c
+
+HEADERS = \
+  arpa/telnet.h \
+  libtelnet/auth-proto.h \
+  libtelnet/auth.h \
+  libtelnet/enc-proto.h \
+  libtelnet/encrypt.h \
+  libtelnet/key-proto.h \
+  libtelnet/misc-proto.h \
+  libtelnet/misc.h \
+  libtelnet/pk.h \
+  telnet/baud.h \
+  telnet/defines.h \
+  telnet/externs.h \
+  telnet/fdset.h \
+  telnet/general.h \
+  telnet/ring.h \
+  telnet/types.h \
+  telnetd/defs.h \
+  telnetd/ext.h \
+  telnetd/pathnames.h \
+  telnetd/telnetd.h
+
+LIBTELNET_OBJS = $(LIBTELNET_SRCS:.c=.o)
+TELNET_OBJS = $(TELNET_SRCS:.c=.o)
+TELNETD_OBJS = $(TELNETD_SRCS:.c=.o)
+OBJS = $(LIBTELNET_OBJS) $(TELNET_OBJS) $(TELNETD_OBJS)
+
+INCLUDES = -I libtelnet -I .
+TELNET_DEFINES = -DTERMCAP -DKLUDGELINEMODE -DENV_HACK -DOPIE
+TELNETD_DEFINES = -DDIAGNOSTICS -DOLD_ENVIRON -DENV_HACK -DSTREAMSPTY
+DEFINES = $(TELNET_DEFINES) $(TELNETD_DEFINES)
+LIBS = -ltermcap
+# CFLAGS suitable for clang or GCC
+CFLAGS = -std=c89 -funsigned-char -Wall -Wno-pointer-sign -Wno-unused-variable -Wno-string-plus-int
+
+.PHONY: all
+all: telnet/telnet telnetd/telnetd
+
+telnet/telnet: $(TELNET_OBJS) $(LIBTELNET_OBJS)
+	$(CC) $(LIBS) $(TELNET_OBJS) $(LIBTELNET_OBJS) -o $@
+
+telnetd/telnetd: $(TELNETD_OBJS) $(LIBTELNET_OBJS)
+	$(CC) $(LIBS) $(TELNETD_OBJS) $(LIBTELNET_OBJS) -o $@
+
+$(OBJS): $(HEADERS)
+%.o: %.c
+	$(CC) $(INCLUDES) \
+		$(if $(findstring $<,$(TELNET_SRCS)),-I telnet $(TELNET_DEFINES)) \
+		$(if $(findstring $<,$(TELNETD_SRCS)),-I telnetd $(TELNETD_DEFINES)) \
+		$(CFLAGS) -c $< -o $@
+
+.PHONY: clean
+clean:
+	$(RM) $(OBJS) telnet/telnet telnetd/telnetd

libtelnet/auth.c

@@ -70,7 +70,7 @@ __FBSDID("$FreeBSD$");
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
-#include <arpa/telnet.h>
+#include "arpa/telnet.h"
 
 #include "encrypt.h"
 #include "auth.h"

libtelnet/enc_des.c

@@ -41,7 +41,7 @@ __FBSDID("$FreeBSD$");
 
 #ifdef	ENCRYPTION
 # ifdef	AUTHENTICATION
-#include <arpa/telnet.h>
+#include "arpa/telnet.h"
 #include <openssl/des.h>
 #include <stdio.h>
 #include <stdlib.h>

libtelnet/encrypt.c

@@ -65,7 +65,7 @@ static const char sccsid[] = "@(#)encrypt.c	8.2 (Berkeley) 5/30/95";
 
 #include <sys/types.h>
 #define	ENCRYPT_NAMES
-#include <arpa/telnet.h>
+#include "arpa/telnet.h"
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>

libtelnet/kerberos.c

@@ -61,7 +61,7 @@ static const char sccsid[] = "@(#)kerberos.c	8.3 (Berkeley) 5/30/95";
 
 #ifdef	KRB4
 #include <sys/types.h>
-#include <arpa/telnet.h>
+#include "arpa/telnet.h"
 #include <openssl/des.h>	/* BSD wont include this in krb.h, so we do it here */
 #include <krb.h>
 #include <stdio.h>

libtelnet/kerberos5.c

@@ -57,7 +57,7 @@ __FBSDID("$FreeBSD$");
 
 #ifdef	KRB5
 
-#include <arpa/telnet.h>
+#include "arpa/telnet.h"
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>

libtelnet/krb4encpwd.c

@@ -76,7 +76,7 @@ static char sccsid[] = "@(#)krb4encpwd.c	8.3 (Berkeley) 5/30/95";
 
 #include <sys/types.h>
 #include <openssl/des.h>
-#include <arpa/telnet.h>
+#include "arpa/telnet.h"
 #include <krb.h>
 #include <pwd.h>
 #include <stdio.h>

libtelnet/rsaencpwd.c

@@ -75,7 +75,7 @@ static char sccsid[] = "@(#)rsaencpwd.c	8.3 (Berkeley) 5/30/95";
  */
 
 #include <sys/types.h>
-#include <arpa/telnet.h>
+#include "arpa/telnet.h"
 #include <pwd.h>
 #include <stdio.h>
 #include <stdlib.h>

libtelnet/sra.c

@@ -35,7 +35,7 @@ __FBSDID("$FreeBSD$");
 #ifdef	SRA
 #ifdef	ENCRYPTION
 #include <sys/types.h>
-#include <arpa/telnet.h>
+#include "arpa/telnet.h"
 #include <pwd.h>
 #include <stdio.h>
 #include <stdlib.h>

telnet/authenc.c

@@ -42,11 +42,11 @@ __FBSDID("$FreeBSD$");
 #ifdef	AUTHENTICATION
 #ifdef	ENCRYPTION
 #include <sys/types.h>
-#include <arpa/telnet.h>
+#include "arpa/telnet.h"
 #include <pwd.h>
 #include <unistd.h>
-#include <libtelnet/encrypt.h>
-#include <libtelnet/misc.h>
+#include "libtelnet/encrypt.h"
+#include "libtelnet/misc.h"
 
 #include "general.h"
 #include "ring.h"

telnet/commands.c

@@ -56,7 +56,7 @@ __FBSDID("$FreeBSD$");
 #include <string.h>
 #include <unistd.h>
 
-#include <arpa/telnet.h>
+#include "arpa/telnet.h"
 #include <arpa/inet.h>
 
 #include "general.h"
@@ -69,10 +69,10 @@ __FBSDID("$FreeBSD$");
 #include "misc.h"
 
 #ifdef	AUTHENTICATION
-#include <libtelnet/auth.h>
+#include "libtelnet/auth.h"
 #endif
 #ifdef	ENCRYPTION
-#include <libtelnet/encrypt.h>
+#include "libtelnet/encrypt.h"
 #endif
 
 #include <netinet/in_systm.h>

telnet/externs.h

@@ -45,14 +45,11 @@
 #define BSD 43
 #endif
 
-#ifndef	USE_TERMIO
-# if BSD > 43 || defined(SYSV_TERMIO)
-#  define USE_TERMIO
-# endif
-#endif
-
 #include <stdio.h>
 #include <setjmp.h>
+#if !defined(USE_TERMIO)
+# define USE_OLD_TTY
+#endif
 #include <sys/ioctl.h>
 #include <errno.h>
 #ifdef	USE_TERMIO
@@ -63,7 +60,7 @@
 #endif
 #if defined(NO_CC_T) || !defined(USE_TERMIO)
 # if !defined(USE_TERMIO)
-typedef char cc_t;
+typedef unsigned char cc_t;
 # else
 typedef unsigned char cc_t;
 # endif
@@ -214,7 +211,7 @@ extern int (*decrypt_input)(int);
 #define	set_his_want_state_dont		set_my_want_state_wont
 #define	set_his_want_state_wont		set_my_want_state_dont
 
-#if	defined(USE_TERMIO)
+#if	defined(USE_TERMIO) || defined(__STDC__)
 #define	SIG_FUNC_RET	void
 #else
 #define	SIG_FUNC_RET	int

telnet/main.c

@@ -50,10 +50,10 @@ __FBSDID("$FreeBSD$");
 #include "defines.h"
 
 #ifdef	AUTHENTICATION
-#include <libtelnet/auth.h>
+#include "libtelnet/auth.h"
 #endif
 #ifdef	ENCRYPTION
-#include <libtelnet/encrypt.h>
+#include "libtelnet/encrypt.h"
 #endif
 
 /* These values need to be the same as defined in libtelnet/kerberos5.c */

telnet/network.c

@@ -46,7 +46,7 @@ __FBSDID("$FreeBSD$");
 #include <errno.h>
 #include <stdlib.h>
 
-#include <arpa/telnet.h>
+#include "arpa/telnet.h"
 #include <unistd.h>
 
 #include "ring.h"

telnet/sys_bsd.c

@@ -53,7 +53,7 @@ __FBSDID("$FreeBSD$");
 #include <signal.h>
 #include <stdlib.h>
 #include <unistd.h>
-#include <arpa/telnet.h>
+#include "arpa/telnet.h"
 
 #include "ring.h"
 #include "fdset.h"

telnet/telnet.c

@@ -50,10 +50,9 @@ __FBSDID("$FreeBSD$");
 #include <curses.h>
 #include <signal.h>
 #include <stdlib.h>
-#include <term.h>
 #include <unistd.h>
 #include <arpa/inet.h>
-#include <arpa/telnet.h>
+#include "arpa/telnet.h"
 
 #include "ring.h"
 
@@ -62,13 +61,19 @@ __FBSDID("$FreeBSD$");
 #include "types.h"
 #include "general.h"
 
+#ifdef USE_TERMIO
+# include <term.h>
+#else
+# include <termcap.h>
+#endif
+
 #ifdef	AUTHENTICATION
-#include <libtelnet/auth.h>
+#include "libtelnet/auth.h"
 #endif
 #ifdef	ENCRYPTION
-#include <libtelnet/encrypt.h>
+#include "libtelnet/encrypt.h"
 #endif
-#include <libtelnet/misc.h>
+#include "libtelnet/misc.h"
 
 #define	strip(x) ((my_want_state_is_wont(TELOPT_BINARY)) ? ((x)&0x7f) : (x))
 

telnet/terminal.c

@@ -39,7 +39,7 @@ static const char sccsid[] = "@(#)terminal.c	8.2 (Berkeley) 2/16/95";
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
-#include <arpa/telnet.h>
+#include "arpa/telnet.h"
 #include <sys/types.h>
 
 #include <stdlib.h>
@@ -50,7 +50,7 @@ __FBSDID("$FreeBSD$");
 #include "types.h"
 
 #ifdef	ENCRYPTION
-#include <libtelnet/encrypt.h>
+#include "libtelnet/encrypt.h"
 #endif
 
 Ring		ttyoring, ttyiring;

telnet/utilities.c

@@ -42,7 +42,7 @@ __FBSDID("$FreeBSD$");
 #define	TELOPTS
 #define	TELCMDS
 #define	SLC_NAMES
-#include <arpa/telnet.h>
+#include "arpa/telnet.h"
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/time.h>
@@ -61,10 +61,10 @@ __FBSDID("$FreeBSD$");
 #include "externs.h"
 
 #ifdef	AUTHENTICATION
-#include <libtelnet/auth.h>
+#include "libtelnet/auth.h"
 #endif
 #ifdef	ENCRYPTION
-#include <libtelnet/encrypt.h>
+#include "libtelnet/encrypt.h"
 #endif
 
 FILE	*NetTrace = 0;		/* Not in bss, since needs to stay */

telnetd/authenc.c

@@ -44,7 +44,7 @@ __FBSDID("$FreeBSD$");
 /* Above "#ifdef"s actually "or"'ed together. XXX MarkM
  */
 #include "telnetd.h"
-#include <libtelnet/misc.h>
+#include "libtelnet/misc.h"
 
 int
 net_write(unsigned char *str, int len)

telnetd/defs.h

@@ -68,7 +68,7 @@
 
 #include <netinet/in.h>
 
-#include <arpa/telnet.h>
+#include "arpa/telnet.h"
 
 #include <stdio.h>
 #ifdef	__STDC__

telnetd/state.c

@@ -42,10 +42,10 @@ __FBSDID("$FreeBSD$");
 #include <stdarg.h>
 #include "telnetd.h"
 #ifdef	AUTHENTICATION
-#include <libtelnet/auth.h>
+#include "libtelnet/auth.h"
 #endif
 #ifdef	ENCRYPTION
-#include <libtelnet/encrypt.h>
+#include "libtelnet/encrypt.h"
 #endif
 
 unsigned char	doopt[] = { IAC, DO, '%', 'c', 0 };

telnetd/sys_term.c

@@ -41,16 +41,13 @@ __FBSDID("$FreeBSD$");
 
 #include <sys/types.h>
 #include <sys/tty.h>
-#include <libutil.h>
 #include <stdlib.h>
 
 #include "telnetd.h"
 #include "pathnames.h"
-#include "types.h"
-#include "baud.h"
 
 #ifdef	AUTHENTICATION
-#include <libtelnet/auth.h>
+#include "libtelnet/auth.h"
 #endif
 
 int cleanopen(char *);
@@ -126,7 +123,6 @@ struct termios termbuf, termbuf2;	/* pty control structure */
 #endif	/* USE_TERMIO */
 
 #include <sys/types.h>
-#include <libutil.h>
 
 int cleanopen(char *);
 void scrub_env(void);
@@ -809,7 +805,11 @@ getptyslave(void)
 # ifdef	LINEMODE
 	waslm = tty_linemode();
 # endif
+# ifdef USE_TERMIO
 	erase = termbuf.c_cc[VERASE];
+# else
+	erase = termbuf.sg.sg_erase;
+# endif
 
 	/*
 	 * Make sure that we don't have a controlling tty, and
@@ -855,8 +855,13 @@ getptyslave(void)
 	 */
 	tty_rspeed((def_rspeed > 0) ? def_rspeed : 9600);
 	tty_tspeed((def_tspeed > 0) ? def_tspeed : 9600);
-	if (erase)
+	if (erase) {
+# ifdef USE_TERMIO
 		termbuf.c_cc[VERASE] = erase;
+# else
+		termbuf.sg.sg_erase = erase;
+# endif
+	}
 # ifdef	LINEMODE
 	if (waslm)
 		tty_setlinemode(1);

telnetd/telnetd.c

@@ -44,20 +44,19 @@ __FBSDID("$FreeBSD$");
 
 #include <sys/mman.h>
 #include <err.h>
-#include <libutil.h>
 #include <paths.h>
 #include <termcap.h>
 
 #include <arpa/inet.h>
 
 #ifdef	AUTHENTICATION
-#include <libtelnet/auth.h>
+#include "libtelnet/auth.h"
 int	auth_level = 0;
 #endif
 #ifdef	ENCRYPTION
-#include <libtelnet/encrypt.h>
+#include "libtelnet/encrypt.h"
 #endif
-#include <libtelnet/misc.h>
+#include "libtelnet/misc.h"
 
 char	remote_hostname[MAXHOSTNAMELEN];
 size_t	utmp_len = sizeof(remote_hostname) - 1;
@@ -658,10 +657,13 @@ terminaltypeok(char *s)
  * Get a pty, scan input lines.
  */
 void
-doit(struct sockaddr *who)
+doit(struct sockaddr *who_)
 {
 	int err_; /* XXX */
+	char *host = NULL;
+	struct hostent *hp;
 	int ptynum;
+	struct sockaddr_in *who;
 
 	/*
 	 * Find an available pty to use.
@@ -686,30 +688,51 @@ doit(struct sockaddr *who)
 #endif
 
 	/* get name of connected client */
-	if (realhostname_sa(remote_hostname, sizeof(remote_hostname) - 1,
-	    who, who->sa_len) == HOSTNAME_INVALIDADDR && registerd_host_only)
+	if (who_->sa_family != AF_INET)
+		fatal(net, "Non-IPv4 addresses are not supported");
+	who = (struct sockaddr_in *)who_;
+	hp = gethostbyaddr((char *)&who->sin_addr, sizeof (struct in_addr),
+		who->sin_family);
+
+	if (hp == NULL && registerd_host_only) {
 		fatal(net, "Couldn't resolve your address into a host name.\r\n\
-	Please contact your net administrator");
-	remote_hostname[sizeof(remote_hostname) - 1] = '\0';
+	 Please contact your net administrator");
+	} else if (hp &&
+	    (strlen(hp->h_name) <= (unsigned int)((utmp_len < 0) ? -utmp_len
+								 : utmp_len))) {
+		strncpy(remote_hostname, hp->h_name,
+			sizeof(remote_hostname)-1);
+		hp = gethostbyname(remote_hostname);
+		if (hp == NULL)
+			host = inet_ntoa(who->sin_addr); 
+		else for (; ; hp->h_addr_list++) {
+			if (hp->h_addr_list[0] == NULL) {
+				/* End of list - ditch it */
+				host = inet_ntoa(who->sin_addr);
+				break;
+			}
+			if (!bcmp(hp->h_addr_list[0], (caddr_t)&who->sin_addr,
+			    sizeof(who->sin_addr))) {
+				host = hp->h_name;
+				break;          /* OK! */
+			}
+		}
+	} else {
+		host = inet_ntoa(who->sin_addr);
+	}
+	/*
+	 * We must make a copy because Kerberos is probably going
+	 * to also do a gethost* and overwrite the static data...
+	 */
+	strncpy(remote_hostname, host, sizeof(remote_hostname)-1);
+	remote_hostname[sizeof(remote_hostname)-1] = 0;
+	host = remote_hostname;
 
-	if (!isdigit(remote_hostname[0]) && strlen(remote_hostname) > utmp_len)
-		err_ = getnameinfo(who, who->sa_len, remote_hostname,
-				  sizeof(remote_hostname), NULL, 0,
-				  NI_NUMERICHOST);
-		/* XXX: do 'err_' check */
-
-	(void) gethostname(host_name, sizeof(host_name) - 1);
-	host_name[sizeof(host_name) - 1] = '\0';
+	(void) gethostname(host_name, sizeof (host_name));
 	hostname = host_name;
 
-#ifdef	AUTHENTICATION
-#ifdef	ENCRYPTION
-/* The above #ifdefs should actually be "or"'ed, not "and"'ed.
- * This is a byproduct of needing "#ifdef" and not "#if defined()"
- * for unifdef. XXX MarkM
- */
-	auth_encrypt_init(hostname, remote_hostname, "TELNETD", 1);
-#endif
+#if	defined(AUTHENTICATION) || defined(ENCRYPTION)
+	auth_encrypt_init(hostname, host, "TELNETD", 1);
 #endif
 
 	init_env();
@@ -720,7 +743,7 @@ doit(struct sockaddr *who)
 	level = getterminaltype(user_name);
 	setenv("TERM", terminaltype ? terminaltype : "network", 1);
 
-	telnet(net, pty, remote_hostname);	/* begin server process */
+	telnet(net, pty, host);		/* begin server process */
 
 	/*NOTREACHED*/
 }  /* end of doit */

telnetd/termstat.c

@@ -42,7 +42,7 @@ __FBSDID("$FreeBSD$");
 #include "telnetd.h"
 
 #ifdef	ENCRYPTION
-#include <libtelnet/encrypt.h>
+#include "libtelnet/encrypt.h"
 #endif
 
 /*

telnetd/utility.c

@@ -48,10 +48,10 @@ __FBSDID("$FreeBSD$");
 #include "telnetd.h"
 
 #ifdef	AUTHENTICATION
-#include <libtelnet/auth.h>
+#include "libtelnet/auth.h"
 #endif
 #ifdef	ENCRYPTION
-#include <libtelnet/encrypt.h>
+#include "libtelnet/encrypt.h"
 #endif
 
 /*