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getaddrinfo.c

/*
 *  Hamlib Interface - getaddrinfo replacement
 *  Copyright (c) 2000-2010 by Stephane Fillod
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Library General Public License as
 *   published by the Free Software Foundation; either version 2 of
 *   the License, or (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU Library General Public License for more details.
 *
 *   You should have received a copy of the GNU Library General Public
 *   License along with this library; if not, write to the Free Software
 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

/* Forcing WINVER in MinGW yanks in getaddrinfo(), but locks out Win95/Win98 */
/* #define WINVER 0x0501 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdlib.h>
#include <stdio.h>   /* Standard input/output definitions */
#include <unistd.h>  /* UNIX standard function definitions */
#include <fcntl.h>   /* File control definitions */
#include <errno.h>   /* Error number definitions */
#include <sys/types.h>
#include <signal.h>


#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#if HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#elif HAVE_WS2TCPIP_H
#include <ws2tcpip.h>
#endif

/*
 * Replacement for getaddrinfo. Only one addrinfo is returned.
 * Weak checking.
 * Return 0 when success, otherwise -1.
 */
#ifndef HAVE_GETADDRINFO
int getaddrinfo(const char *node, const char *service,
      const struct addrinfo *hints, struct addrinfo **res)
{
    struct addrinfo *p;
    int ai_family, ai_socktype, ai_protocol, ai_flags;

    /* limitation: service must be non null */
    if (!service)
        return -1;

    if (hints == NULL) {
        ai_family = AF_UNSPEC;
        ai_socktype = 0;
        ai_protocol = 0;
        ai_flags = 0;
    } else {
        ai_family = hints->ai_family;
        ai_socktype = hints->ai_socktype;
        ai_protocol = hints->ai_protocol;
        ai_flags = hints->ai_flags;
    }

    /* limitation: this replacement function only for IPv4 */
    if (ai_family == AF_UNSPEC)
        ai_family = AF_INET;

    if (ai_family != AF_INET)
      return -1;

    p = malloc(sizeof(struct addrinfo));
    if (!p)
      return -1;

    memset(p, 0, sizeof(struct addrinfo));
    p->ai_family = ai_family;
    p->ai_socktype = ai_socktype;
    p->ai_protocol = ai_protocol;
    p->ai_addrlen = sizeof(struct sockaddr_in);
    p->ai_addr = malloc(p->ai_addrlen);
    if (!p->ai_addr) {
      free(p);
      return -1;
    }
    memset((char *) p->ai_addr, 0, p->ai_addrlen);

    ((struct sockaddr_in*)p->ai_addr)->sin_family = p->ai_family;
    /* limitation: the service must be a port _number_ */
    ((struct sockaddr_in*)p->ai_addr)->sin_port = htons(atoi(service));
    /* limitation: the node must be in numbers-and-dots notation */
    if (!node && (ai_flags & AI_PASSIVE))
        ((struct sockaddr_in*)p->ai_addr)->sin_addr.s_addr = INADDR_ANY;
    else
        ((struct sockaddr_in*)p->ai_addr)->sin_addr.s_addr = inet_addr(node);

    *res = p;

    return 0;
}

void freeaddrinfo(struct addrinfo *res)
{
      free(res->ai_addr);
      free(res);
}
#endif /* !HAVE_GETADDRINFO */

#if !defined(HAVE_GAI_STRERROR) && !defined(gai_strerror)
const char *gai_strerror(int errcode)
{
      return strerror(errcode);
}
#endif /* !HAVE_GAI_STRERROR */


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