Add an implementation of getaddrinfo and getnameinfo, which are missing in GNO.

These are adapted from a version in netperf.

Makefile.common

@@ -10,7 +10,8 @@ LIBTELNET_SRCS = \
   libtelnet/misc.c \
   libtelnet/read_password.c \
   libtelnet/rsaencpwd.c \
-  libtelnet/sra.c
+  libtelnet/sra.c \
+  libtelnet/getaddrinfo.c
 # libtelnet/pk.c 
 
 TELNET_SRCS = \
@@ -44,6 +45,7 @@ HEADERS = \
   libtelnet/misc-proto.h \
   libtelnet/misc.h \
   libtelnet/pk.h \
+  libtelnet/getaddrinfo.h \
   telnet/baud.h \
   telnet/defines.h \
   telnet/externs.h \

libtelnet/getaddrinfo.c

@@ -0,0 +1,545 @@
+/*
+ * Copyright (c) 2001, 02  Motoyuki Kasahara
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. Neither the name of the project 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 PROJECT 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 PROJECT 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.
+ */
+
+/*
+ * This program provides getaddrinfo() and getnameinfo() described in
+ * RFC2133, 2553 and 3493.  These functions are mainly used for IPv6
+ * application to resolve hostname or address.
+ * 
+ * This program is designed to be working on traditional IPv4 systems
+ * which don't have those functions.  Therefore, this implementation
+ * supports IPv4 only.
+ *
+ * This program is useful for application which should support both IPv6
+ * and traditional IPv4 systems.  Use genuine getaddrinfo() and getnameinfo()
+ * provided by system if the system supports IPv6.  Otherwise, use this
+ * implementation.
+ * 
+ * This program is intended to be used in combination with GNU Autoconf.
+ * 
+ * This program also provides freeaddrinfo() and gai_strerror().
+ *
+ * To use this program in your application, insert the following lines to
+ * C source files after including `sys/types.h', `sys/socket.h' and
+ * `netdb.h'.  `getaddrinfo.h' defines `struct addrinfo' and AI_, NI_,
+ * EAI_ macros.
+ * 
+ *    #ifndef HAVE_GETADDRINFO
+ *    #include "getaddrinfo.h"
+ *    #endif
+ * 
+ * Restriction:
+ *   getaddrinfo() and getnameinfo() of this program are NOT thread
+ *   safe, unless the cpp macro ENABLE_PTHREAD is defined.
+ */
+
+#ifdef __GNO__
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <sys/types.h>
+#include <stdio.h>
+
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+
+#include <string.h>
+#include <stdlib.h>
+
+#ifdef ENABLE_PTHREAD
+#include <pthread.h>
+#endif
+
+#ifdef ENABLE_NLS
+#include <libintl.h>
+#endif
+
+extern int h_errno;
+
+#include "getaddrinfo.h"
+
+#ifdef ENABLE_NLS
+#define _(string) gettext(string)
+#ifdef gettext_noop
+#define N_(string) gettext_noop(string)
+#else
+#define N_(string) (string)
+#endif
+#else
+#define gettext(string) (string)
+#define _(string) (string)
+#define N_(string) (string)
+#endif
+
+/*
+ * Error messages for gai_strerror().
+ */
+static char *eai_errlist[] = {
+    N_("Success"),
+
+    /* EAI_ADDRFAMILY */
+    N_("Address family for hostname not supported"),
+
+    /* EAI_AGAIN */
+    N_("Temporary failure in name resolution"),
+
+    /* EAI_BADFLAGS */
+    N_("Invalid value for ai_flags"),
+
+    /* EAI_FAIL */
+    N_("Non-recoverable failure in name resolution"),
+
+    /* EAI_FAMILY */
+    N_("ai_family not supported"),                      
+
+    /* EAI_MEMORY */
+    N_("Memory allocation failure"),
+
+    /* EAI_NONAME */
+    N_("hostname nor servname provided, or not known"),
+
+    /* EAI_OVERFLOW */
+    N_("An argument buffer overflowed"),
+
+    /* EAI_SERVICE */
+    N_("servname not supported for ai_socktype"),
+
+    /* EAI_SOCKTYPE */
+    N_("ai_socktype not supported"),
+
+    /* EAI_SYSTEM */
+    N_("System error returned in errno")
+};
+
+/*
+ * Default hints for getaddrinfo().
+ */
+static struct addrinfo default_hints = {
+    0, PF_UNSPEC, 0, 0, 0, NULL, NULL, NULL
+};
+
+/*
+ * Mutex.
+ */
+#ifdef ENABLE_PTHREAD
+static pthread_mutex_t gai_mutex = PTHREAD_MUTEX_INITIALIZER;
+#endif
+
+/*
+ * Declaration of static functions.
+ */
+static int is_integer(const char *);
+static int is_address(const char *);
+static int itoa_length(int);
+
+/*
+ * gai_strerror().
+ */
+const char *
+gai_strerror(int ecode)
+{
+    if (ecode < 0 || ecode > EAI_SYSTEM)
+	return _("Unknown error");
+
+    return gettext(eai_errlist[ecode]);
+}
+
+/*
+ * freeaddrinfo().
+ */
+void
+freeaddrinfo(struct addrinfo *ai)
+{
+    struct addrinfo *next_ai;
+
+    while (ai != NULL) {
+	if (ai->ai_canonname != NULL)
+	    free(ai->ai_canonname);
+	if (ai->ai_addr != NULL)
+	    free(ai->ai_addr);
+	next_ai = ai->ai_next;
+	free(ai);
+	ai = next_ai;
+    }
+}
+
+/*
+ * Return 1 if the string `s' represents an integer.
+ */
+static int
+is_integer(const char *s)
+{
+    if (*s == '-' || *s == '+')
+	s++;
+    if (*s < '0' || '9' < *s)
+	return 0;
+
+    s++;
+    while ('0' <= *s && *s <= '9')
+	s++;
+
+    return (*s == '\0');
+}
+
+/*
+ * Return 1 if the string `s' represents an IPv4 address.
+ * Unlike inet_addr(), it doesn't permit malformed nortation such
+ * as "192.168".
+ */
+static int
+is_address(const char *s)
+{
+    const static char delimiters[] = {'.', '.', '.', '\0'};
+    int i, j;
+    int octet;
+
+    for (i = 0; i < 4; i++) {
+	if (*s == '0' && *(s + 1) != delimiters[i])
+	    return 0;
+	for (j = 0, octet = 0; '0' <= *s && *s <= '9' && j < 3; s++, j++)
+	    octet = octet * 10 + (*s - '0');
+	if (j == 0 || octet > 255 || *s != delimiters[i])
+	    return 0;
+	s++;
+    }
+
+    return 1;
+}
+
+/*
+ * Calcurate length of the string `s', where `s' is set by
+ * sprintf(s, "%d", n).
+ */
+static int
+itoa_length(int n)
+{
+    int result = 1;
+
+    if (n < 0) {
+	n = -n;
+	result++;
+    }
+
+    while (n >= 10) {
+	result++;
+	n /= 10;
+    }
+
+    return result;
+}
+
+/*
+ * getaddrinfo().
+ */
+int
+getaddrinfo(
+    const char *nodename,
+    const char *servname,
+    const struct addrinfo *hints,
+    struct addrinfo **res
+)
+{
+    struct addrinfo *head_res = NULL;
+    struct addrinfo *tail_res = NULL;
+    struct addrinfo *new_res;
+    struct sockaddr_in *sa_in;
+    struct in_addr **addr_list;
+    struct in_addr *addr_list_buf[2];
+    struct in_addr addr_buf;
+    struct in_addr **ap;
+    struct servent *servent;
+    struct hostent *hostent;
+    const char *canonname = NULL;
+    in_port_t port;
+    int saved_h_errno;
+    int result = 0;
+
+#ifdef ENABLE_PTHREAD
+    pthread_mutex_lock(&gai_mutex);
+#endif
+
+    saved_h_errno = h_errno;
+
+    if (nodename == NULL && servname == NULL) {
+	result = EAI_NONAME;
+	goto end;
+    }
+
+    if (hints != NULL) {
+	if (hints->ai_family != PF_INET && hints->ai_family != PF_UNSPEC) {
+	    result = EAI_FAMILY;
+	    goto end;
+	}
+	if (hints->ai_socktype != SOCK_DGRAM
+	    && hints->ai_socktype != SOCK_STREAM
+	    && hints->ai_socktype != 0) {
+	    result = EAI_SOCKTYPE;
+	    goto end;
+	}
+    } else {
+	hints = &default_hints;
+    }
+
+    if (servname != NULL) {
+	if (is_integer(servname))
+	    port = htons(atoi(servname));
+	else  {
+	    if (hints->ai_flags & AI_NUMERICSERV) {
+		result = EAI_NONAME;
+		goto end;
+	    }
+
+	    if (hints->ai_socktype == SOCK_DGRAM)
+		servent = getservbyname(servname, "udp");
+	    else if (hints->ai_socktype == SOCK_STREAM)
+		servent = getservbyname(servname, "tcp");
+	    else if (hints->ai_socktype == 0)
+		servent = getservbyname(servname, "tcp");
+	    else {
+		result = EAI_SOCKTYPE;
+		goto end;
+	    }
+
+	    if (servent == NULL) {
+		result = EAI_SERVICE;
+		goto end;
+	    }
+	    port = servent->s_port;
+	}
+    } else {
+	port = htons(0);
+    }
+
+    if (nodename != NULL) {
+	if (is_address(nodename)) {
+	    addr_buf.s_addr = inet_addr(nodename);
+	    addr_list_buf[0] = &addr_buf;
+	    addr_list_buf[1] = NULL;
+	    addr_list = addr_list_buf;
+
+	    if (hints->ai_flags & AI_CANONNAME
+		&& !(hints->ai_flags & AI_NUMERICHOST)) {
+		hostent = gethostbyaddr((char *)&addr_buf,
+		    sizeof(struct in_addr), AF_INET);
+		if (hostent != NULL)
+		    canonname = hostent->h_name;
+		else
+		    canonname = nodename;
+	    }
+	} else {
+	    if (hints->ai_flags & AI_NUMERICHOST) {
+		result = EAI_NONAME;
+		goto end;
+	    }
+
+	    hostent = gethostbyname(nodename);
+	    if (hostent == NULL) {
+		switch (h_errno) {
+		case HOST_NOT_FOUND:
+		case NO_DATA:
+		    result = EAI_NONAME;
+		    goto end;
+		case TRY_AGAIN:
+		    result = EAI_AGAIN;
+		    goto end;
+		default:
+		    result = EAI_FAIL;
+		    goto end;
+                }
+	    }
+	    addr_list = (struct in_addr **)hostent->h_addr_list;
+
+	    if (hints->ai_flags & AI_CANONNAME)
+		canonname = hostent->h_name;
+	}
+    } else {
+	if (hints->ai_flags & AI_PASSIVE)
+	    addr_buf.s_addr = htonl(INADDR_ANY);
+	else
+	    addr_buf.s_addr = htonl(0x7F000001);
+	addr_list_buf[0] = &addr_buf;
+	addr_list_buf[1] = NULL;
+	addr_list = addr_list_buf;
+    }
+
+    for (ap = addr_list; *ap != NULL; ap++) {
+	new_res = (struct addrinfo *)malloc(sizeof(struct addrinfo));
+	if (new_res == NULL) {
+	    if (head_res != NULL)
+		freeaddrinfo(head_res);
+	    result = EAI_MEMORY;
+	    goto end;
+	}
+
+	new_res->ai_family = PF_INET;
+	new_res->ai_socktype = hints->ai_socktype;
+	new_res->ai_protocol = hints->ai_protocol;
+	new_res->ai_addr = NULL;
+	new_res->ai_addrlen = sizeof(struct sockaddr_in);
+	new_res->ai_canonname = NULL;
+	new_res->ai_next = NULL;
+
+	new_res->ai_addr = (struct sockaddr *)
+	    malloc(sizeof(struct sockaddr_in));
+	if (new_res->ai_addr == NULL) {
+	    free(new_res);
+	    if (head_res != NULL)
+		freeaddrinfo(head_res);
+	    result = EAI_MEMORY;
+	    goto end;
+	}
+
+	sa_in = (struct sockaddr_in *)new_res->ai_addr;
+	memset(sa_in, 0, sizeof(struct sockaddr_in));
+	sa_in->sin_family = PF_INET;
+	sa_in->sin_port = port;
+	memcpy(&sa_in->sin_addr, *ap, sizeof(struct in_addr));
+
+	if (head_res == NULL)
+	    head_res = new_res;
+	else
+	    tail_res->ai_next = new_res;
+	tail_res = new_res;
+    }
+
+    if (canonname != NULL && head_res != NULL) {
+	head_res->ai_canonname = (char *)malloc(strlen(canonname) + 1);
+	if (head_res->ai_canonname != NULL)
+	    strcpy(head_res->ai_canonname, canonname);
+    }
+
+    *res = head_res;
+
+  end:
+    h_errno = saved_h_errno;
+#ifdef ENABLE_PTHREAD
+    pthread_mutex_unlock(&gai_mutex);
+#endif
+    return result;
+}
+
+/*
+ * getnameinfo().
+ */
+int
+getnameinfo(
+    const struct sockaddr *sa,
+    socklen_t salen,
+    char *node,
+    socklen_t nodelen,
+    char *serv,
+    socklen_t servlen,
+    int flags
+)
+{
+    const struct sockaddr_in *sa_in = (const struct sockaddr_in *)sa;
+    struct hostent *hostent;
+    struct servent *servent;
+    char *ntoa_address;
+    int saved_h_errno;
+    int result = 0;
+
+#ifdef ENABLE_PTHREAD
+    pthread_mutex_lock(&gai_mutex);
+#endif
+
+    saved_h_errno = h_errno;
+
+    if (sa_in->sin_family != PF_INET) {
+	result = EAI_FAMILY;
+	goto end;
+    } else if (node == NULL && serv == NULL) {
+	result = EAI_NONAME;
+	goto end;
+    }
+
+    if (serv != NULL && servlen > 0) {
+	if (flags & NI_NUMERICSERV)
+	    servent = NULL;
+	else if (flags & NI_DGRAM)
+	    servent = getservbyport(sa_in->sin_port, "udp");
+	else
+	    servent = getservbyport(sa_in->sin_port, "tcp");
+
+	if (servent != NULL) {
+	    if (servlen <= strlen(servent->s_name)) {
+		result = EAI_OVERFLOW;
+		goto end;
+	    }
+	    strcpy(serv, servent->s_name);
+	} else {
+	    if (servlen <= itoa_length(ntohs(sa_in->sin_port))) {
+		result = EAI_OVERFLOW;
+		goto end;
+	    }
+	    sprintf(serv, "%d", ntohs(sa_in->sin_port));
+	}
+    }
+
+    if (node != NULL && nodelen > 0) {
+	if (flags & NI_NUMERICHOST)
+	    hostent = NULL;
+	else {
+	    hostent = gethostbyaddr((char *)&sa_in->sin_addr, 
+		sizeof(struct in_addr), AF_INET);
+	}
+	if (hostent != NULL) {
+	    if (nodelen <= strlen(hostent->h_name)) {
+		result = EAI_OVERFLOW;
+		goto end;
+	    }
+	    strcpy(node, hostent->h_name);
+	} else {
+	    if (flags & NI_NAMEREQD) {
+		result = EAI_NONAME;
+		goto end;
+	    }
+	    ntoa_address = inet_ntoa(sa_in->sin_addr);
+	    if (nodelen <= strlen(ntoa_address)) {
+		result = EAI_OVERFLOW;
+		goto end;
+	    }
+	    strcpy(node, ntoa_address);
+	}
+		
+    }
+
+  end:
+    h_errno = saved_h_errno;
+#ifdef ENABLE_PTHREAD
+    pthread_mutex_unlock(&gai_mutex);
+#endif
+    return result;
+}
+
+#endif
+
+

libtelnet/getaddrinfo.h

@@ -0,0 +1,242 @@
+/*
+ * Copyright (c) 2001, 02  Motoyuki Kasahara
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. Neither the name of the project 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 PROJECT 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 PROJECT 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.
+ */
+
+#ifndef GETADDRINFO_H
+#define GETADDRINFO_H
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <sys/types.h>
+
+#ifdef WIN32
+#include <time.h>
+#include <winsock2.h>
+#ifdef DO_IPV6
+#include <ws2tcpip.h>
+#endif  /* DO_IPV6 */
+#include <windows.h>
+#else
+#include <sys/socket.h>
+#include <netdb.h>
+#endif
+
+#ifdef __GNO__
+typedef int socklen_t;
+typedef unsigned short in_port_t;
+#endif
+
+/********************************************************************/
+/*
+ * Undefine all the macros.
+ * <netdb.h> might defines some of them.
+ */
+#ifdef EAI_ADDRFAMILY
+#undef EAI_ADDRFAMILY
+#endif
+#ifdef EAI_AGAIN
+#undef EAI_AGAIN
+#endif
+#ifdef EAI_BADFLAGS
+#undef EAI_BADFLAGS
+#endif
+#ifdef EAI_FAIL
+#undef EAI_FAIL
+#endif
+#ifdef EAI_FAMILY
+#undef EAI_FAMILY
+#endif
+#ifdef EAI_MEMORY
+#undef EAI_MEMORY
+#endif
+#ifdef EAI_NONAME
+#undef EAI_NONAME
+#endif
+#ifdef EAI_OVERFLOW
+#undef EAI_OVERFLOW
+#endif
+#ifdef EAI_SERVICE
+#undef EAI_SERVICE
+#endif
+#ifdef EAI_SOCKTYPE
+#undef EAI_SOCKTYPE
+#endif
+#ifdef EAI_SYSTEM
+#undef EAI_SYSTEM
+#endif
+
+#ifdef AI_PASSIVE
+#undef AI_PASSIVE
+#endif
+#ifdef AI_CANONNAME
+#undef AI_CANONNAME
+#endif
+#ifdef AI_NUMERICHOST
+#undef AI_NUMERICHOST
+#endif
+#ifdef AI_NUMERICSERV
+#undef AI_NUMERICSERV
+#endif
+#ifdef AI_V4MAPPED
+#undef AI_V4MAPPED
+#endif
+#ifdef AI_ALL
+#undef AI_ALL
+#endif
+#ifdef AI_ADDRCONFIG
+#undef AI_ADDRCONFIG
+#endif
+#ifdef AI_DEFAULT
+#undef AI_DEFAULT
+#endif
+
+#ifdef NI_NOFQDN
+#undef NI_NOFQDN
+#endif
+#ifdef NI_NUMERICHOST
+#undef NI_NUMERICHOST
+#endif
+#ifdef NI_NAMEREQD
+#undef NI_NAMEREQD
+#endif
+#ifdef NI_NUMERICSERV
+#undef NI_NUMERICSERV
+#endif
+#ifdef NI_NUMERICSCOPE
+#undef NI_NUMERICSCOPE
+#endif
+
+#ifdef NI_DGRAM
+#undef NI_DGRAM
+#endif
+#ifdef NI_MAXHOST
+#undef NI_MAXHOST
+#endif
+#ifdef NI_MAXSERV
+#undef NI_MAXSERV
+#endif
+
+/*
+ * Fake struct and function names.
+ * <netdb.h> might declares all or some of them.
+ */
+#if defined(HAVE_GETADDRINFO) || defined(HAVE_GETNAMEINFO)
+#define addrinfo my_addrinfo
+#define gai_strerror my_gai_strerror
+#define freeaddrinfo my_freeaddrinfo
+#define getaddrinfo my_getaddrinfo
+#define getnameinfo my_getnameinfo
+#endif
+
+/********************************************************************/
+/*
+ * Error codes.
+ */
+#define EAI_ADDRFAMILY	1
+#define EAI_AGAIN	2
+#define EAI_BADFLAGS	3
+#define EAI_FAIL	4
+#define EAI_FAMILY	5
+#define EAI_MEMORY	6
+#define EAI_NONAME	7
+#define EAI_OVERFLOW	8
+#define EAI_SERVICE	9
+#define EAI_SOCKTYPE	10
+#define EAI_SYSTEM	11
+
+/*
+ * Flags for getaddrinfo().
+ */
+#define AI_ADDRCONFIG	0x0001
+#define AI_ALL		0x0002
+#define AI_CANONNAME	0x0004
+#define AI_NUMERICHOST	0x0008
+#define AI_NUMERICSERV	0x0010
+#define AI_PASSIVE	0x0020
+#define AI_V4MAPPED	0x0040
+#define AI_DEFAULT	(AI_V4MAPPED | AI_ADDRCONFIG)
+
+/*
+ * Flags for getnameinfo().
+ */
+#define NI_DGRAM	0x0001
+#define NI_NAMEREQD	0x0002
+#define NI_NOFQDN	0x0004
+#define NI_NUMERICHOST	0x0008
+#define NI_NUMERICSCOPE	0x0010
+#define NI_NUMERICSERV	0x0020
+
+/*
+ * Maximum length of FQDN and servie name for getnameinfo().
+ */
+#define NI_MAXHOST	1025
+#define NI_MAXSERV	32
+
+/*
+ * Address families and Protocol families.
+ */
+#ifndef AF_UNSPEC
+#define AF_UNSPEC AF_INET
+#endif
+#ifndef PF_UNSPEC
+#define PF_UNSPEC PF_INET
+#endif
+
+/*
+ * struct addrinfo.
+ */
+struct addrinfo {
+    int ai_flags;
+    int ai_family;
+    int ai_socktype;
+    int ai_protocol;
+    socklen_t ai_addrlen;
+    char *ai_canonname;
+    struct sockaddr *ai_addr;
+    struct addrinfo *ai_next;
+};
+
+/*
+ * Functions.
+ */
+#ifdef __STDC__
+const char *gai_strerror(int);
+void freeaddrinfo(struct addrinfo *);
+int getaddrinfo(const char *, const char *, const struct addrinfo *,
+    struct addrinfo **);
+int getnameinfo(const struct sockaddr *, socklen_t, char *, 
+    socklen_t, char *, socklen_t, int);
+#else
+const char *gai_strerror();
+void freeaddrinfo();
+int getaddrinfo();
+int getnameinfo();
+#endif
+
+#endif /* not GETADDRINFO_H */

telnet/commands.c

@@ -51,6 +51,9 @@ static const char sccsid[] = "@(#)commands.c	8.4 (Berkeley) 5/30/95";
 #include <err.h>
 #include <errno.h>
 #include <netdb.h>
+#ifdef __GNO__
+#include "libtelnet/getaddrinfo.h"
+#endif
 #include <pwd.h>
 #include <signal.h>
 #include <stdarg.h>

telnetd/telnetd.c

@@ -42,6 +42,10 @@ static const char sccsid[] = "@(#)telnetd.c	8.4 (Berkeley) 5/30/95";
 #include "telnetd.h"
 #include "pathnames.h"
 
+#ifdef __GNO__
+#include "libtelnet/getaddrinfo.h"
+#endif
+
 #include <err.h>
 #include <paths.h>
 #include <termcap.h>