[thirdparty/squid.git] / compat / getnameinfo.c

/*
 *  Shamelessly duplicated from the fetchmail public sources
 *  for use by the Squid Project under GNU Public License.
 *
 * Update/Maintenance History:
 *
 *    16-Aug-2007 : Copied from fetchmail 6.3.8
 *                      - added protection around libray headers
 *                      - added use of alternative name xgetnameinfo
 *                        to split from any OS-provided.
 *
 *    06-Oct-2007 : Various fixes to allow the build on MinGW
 *                      - use srtncpy instead of strlcpy
 *                      - use xinet_ntop instead of inet_ntop
 *                      - use SQUIDHOSTNAMELEN instead of MAXHOSTNAMELEN
 *
 *  Original License and code follows.
 */
#include "squid.h"

/*	KAME: getnameinfo.c,v 1.72 2005/01/13 04:12:03 itojun Exp 	*/

/*
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * All rights reserved.
 *
 * 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.
 */

/*
 * Issues to be discussed:
 * - RFC2553 says that we should raise error on short buffer.  X/Open says
 *   we need to truncate the result.  We obey RFC2553 (and X/Open should be
 *   modified).  ipngwg rough consensus seems to follow RFC2553.  RFC3493 says
 *   nothing about it, but defines a new error code EAI_OVERFLOW which seems
 *   to be intended the code for this case.
 * - What is "local" in NI_NOFQDN?  (see comments in the code)
 * - NI_NAMEREQD and NI_NUMERICHOST conflict with each other.
 * - (KAME extension) always attach textual scopeid (fe80::1%lo0), if
 *   sin6_scope_id is filled - standardization status?
 * - what should we do if we should do getservbyport("sctp")?
 */

/*
 * Considerations about thread-safeness
 *   The code in this file is thread-safe, and so the thread-safeness of
 *   getnameinfo() depends on the property of backend functions.
 *     - getservbyport() is not thread safe for most systems we are targeting.
 *     - getipnodebyaddr() is thread safe.  However, many resolver libraries
 *       used in the function are not thread safe.
 *     - gethostbyaddr() is usually not thread safe.
 */

#if !HAVE_GETNAMEINFO

#include "compat/getaddrinfo.h"
#include "compat/inet_ntop.h"

#if HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#if HAVE_NET_IF_H
#include <net/if.h>
#endif
#if HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#if HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#if HAVE_ARPA_NAMESER_H
#include <arpa/nameser.h>
#endif
#if HAVE_NETDB_H
#include <netdb.h>
#endif
#if HAVE_RESOLV_H
#include <resolv.h>
#endif
#if HAVE_STRING_H
#include <string.h>
#endif
#if HAVE_STDDEF_H
#include <stddef.h>
#endif
#if HAVE_ERRNO_H
#include <errno.h>
#endif
#if HAVE_INTTYPES_H
#include <inttypes.h>
#endif

#if _SQUID_WINDOWS_
#undef IN_ADDR
#include <ws2tcpip.h>
#endif

static const struct afd {
    int a_af;
    int a_addrlen;
    int a_socklen;
    int a_off;
    int a_portoff;
} afdl [] = {
#if INET6
    {PF_INET6, sizeof(struct in6_addr), sizeof(struct sockaddr_in6),
        offsetof(struct sockaddr_in6, sin6_addr),
        offsetof(struct sockaddr_in6, sin6_port)},
#endif
    {PF_INET, sizeof(struct in_addr), sizeof(struct sockaddr_in),
     offsetof(struct sockaddr_in, sin_addr),
     offsetof(struct sockaddr_in, sin_port)},
    {0, 0, 0, 0, 0},
};

#if INET6
static int ip6_parsenumeric __P((const struct sockaddr *, const char *, char *,
                                 size_t, int));
static int ip6_sa2str __P((const struct sockaddr_in6 *, char *, size_t, int));
#endif

int
xgetnameinfo(sa, salen, host, hostlen, serv, servlen, flags)
const struct sockaddr *sa;
socklen_t salen;
char *host;
size_t hostlen;
char *serv;
size_t servlen;
int flags;
{
    const struct afd *afd;
    struct servent *sp;
    struct hostent *hp;
    unsigned short port;
    int family, i;
    const char *addr;
    uint32_t v4a;
    char numserv[512];

    if (sa == NULL)
        return EAI_FAIL;

#if HAVE_SA_LEN	/*XXX*/
    if (sa->sa_len != salen)
        return EAI_FAIL;
#endif

    family = sa->sa_family;
    for (i = 0; afdl[i].a_af; i++)
        if (afdl[i].a_af == family) {
            afd = &afdl[i];
            goto found;
        }
    return EAI_FAMILY;

found:
    if (salen != afd->a_socklen)
        return EAI_FAIL;

    /* network byte order */
    memcpy(&port, (const char *)sa + afd->a_portoff, sizeof(port));
    addr = (const char *)sa + afd->a_off;

    if (serv == NULL || servlen == 0) {
        /*
         * do nothing in this case.
         * in case you are wondering if "&&" is more correct than
         * "||" here: RFC3493 says that serv == NULL OR servlen == 0
         * means that the caller does not want the result.
         */
    } else {
        if (flags & NI_NUMERICSERV)
            sp = NULL;
        else {
            sp = getservbyport(port,
                               (flags & NI_DGRAM) ? "udp" : "tcp");
        }
        if (sp) {
            if (strlen(sp->s_name) + 1 > servlen)
                return EAI_OVERFLOW;
            strncpy(serv, sp->s_name, servlen);
        } else {
            snprintf(numserv, sizeof(numserv), "%u", ntohs(port));
            if (strlen(numserv) + 1 > servlen)
                return EAI_OVERFLOW;
            strncpy(serv, numserv, servlen);
        }
    }

    switch (sa->sa_family) {
    case AF_INET:
        v4a = (uint32_t)
              ntohl(((const struct sockaddr_in *)sa)->sin_addr.s_addr);
        if (IN_MULTICAST(v4a) || IN_EXPERIMENTAL(v4a))
            flags |= NI_NUMERICHOST;
        v4a >>= IN_CLASSA_NSHIFT;
        if (v4a == 0)
            flags |= NI_NUMERICHOST;
        break;
#if INET6
    case AF_INET6: {
        const struct sockaddr_in6 *sin6;
        sin6 = (const struct sockaddr_in6 *)sa;
        switch (sin6->sin6_addr.s6_addr[0]) {
        case 0x00:
            if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
                ;
            else if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr))
                ;
            else
                flags |= NI_NUMERICHOST;
            break;
        default:
            if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
                flags |= NI_NUMERICHOST;
            else if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
                flags |= NI_NUMERICHOST;
            break;
        }
    }
    break;
#endif
    }
    if (host == NULL || hostlen == 0) {
        /*
         * do nothing in this case.
         * in case you are wondering if "&&" is more correct than
         * "||" here: RFC3493 says that host == NULL or hostlen == 0
         * means that the caller does not want the result.
         */
    } else if (flags & NI_NUMERICHOST) {
        /* NUMERICHOST and NAMEREQD conflicts with each other */
        if (flags & NI_NAMEREQD)
            return EAI_NONAME;

        goto numeric;
    } else {
#if USE_GETIPNODEBY
        int h_error = 0;
        hp = getipnodebyaddr(addr, afd->a_addrlen, afd->a_af, &h_error);
#else
        hp = gethostbyaddr(addr, afd->a_addrlen, afd->a_af);
#if 0 // getnameinfo.c:161:9: error: variable 'h_error' set but not used
#if HAVE_H_ERRNO
        h_error = h_errno;
#else
        h_error = EINVAL;
#endif
#endif /* 0 */
#endif

        if (hp) {
#if 0
            if (flags & NI_NOFQDN) {
                /*
                 * According to RFC3493 section 6.2, NI_NOFQDN
                 * means "node name portion of the FQDN shall
                 * be returned for local hosts."  The following
                 * code tries to implement it by returning the
                 * first label (the part before the first
                 * period) of the FQDN.  However, it is not
                 * clear if this always makes sense, since the
                 * given address may be outside of "local
                 * hosts."  Due to the unclear description, we
                 * disable the code in this implementation.
                 */
                char *p;
                p = strchr(hp->h_name, '.');
                if (p)
                    *p = '\0';
            }
#endif
            if (strlen(hp->h_name) + 1 > hostlen) {
#if USE_GETIPNODEBY
                freehostent(hp);
#endif
                return EAI_OVERFLOW;
            }
            strncpy(host, hp->h_name, hostlen);
#if USE_GETIPNODEBY
            freehostent(hp);
#endif
        } else {
            if (flags & NI_NAMEREQD)
                return EAI_NONAME;

numeric:
            switch (afd->a_af) {
#if INET6
            case AF_INET6: {
                int error;

                if ((error = ip6_parsenumeric(sa, addr, host,
                                              hostlen,
                                              flags)) != 0)
                    return(error);
                break;
            }
#endif
            default:
                if (inet_ntop(afd->a_af, addr, host,
                              hostlen) == NULL)
                    return EAI_SYSTEM;
                break;
            }
        }
    }
    return(0);
}

#if INET6
static int
ip6_parsenumeric(sa, addr, host, hostlen, flags)
const struct sockaddr *sa;
const char *addr;
char *host;
size_t hostlen;
int flags;
{
    int numaddrlen;
    char numaddr[512];

    if (inet_ntop(AF_INET6, addr, numaddr, sizeof(numaddr)) == NULL)
        return EAI_SYSTEM;

    numaddrlen = strlen(numaddr);
    if (numaddrlen + 1 > hostlen) /* don't forget terminator */
        return EAI_OVERFLOW;
    strncpy(host, numaddr, hostlen);

    if (((const struct sockaddr_in6 *)sa)->sin6_scope_id) {
        char zonebuf[SQUIDHOSTNAMELEN];
        int zonelen;

        zonelen = ip6_sa2str(
                      (const struct sockaddr_in6 *)(const void *)sa,
                      zonebuf, sizeof(zonebuf), flags);
        if (zonelen < 0)
            return EAI_OVERFLOW;
        if (zonelen + 1 + numaddrlen + 1 > hostlen)
            return EAI_OVERFLOW;

        /* construct <numeric-addr><delim><zoneid> */
        memcpy(host + numaddrlen + 1, zonebuf,
               (size_t)zonelen);
        host[numaddrlen] = SCOPE_DELIMITER;
        host[numaddrlen + 1 + zonelen] = '\0';
    }

    return 0;
}

/* ARGSUSED */
static int
ip6_sa2str(sa6, buf, bufsiz, flags)
const struct sockaddr_in6 *sa6;
char *buf;
size_t bufsiz;
int flags;
{
    unsigned int ifindex;
    const struct in6_addr *a6;
    int n;

    ifindex = (unsigned int)sa6->sin6_scope_id;
    a6 = &sa6->sin6_addr;

#if NI_NUMERICSCOPE
    if ((flags & NI_NUMERICSCOPE) != 0) {
        n = snprintf(buf, bufsiz, "%u", sa6->sin6_scope_id);
        if (n < 0 || n >= bufsiz)
            return -1;
        else
            return n;
    }
#endif

    /* if_indextoname() does not take buffer size.  not a good api... */
    if ((IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6) ||
            IN6_IS_ADDR_MC_NODELOCAL(a6)) && bufsiz >= IF_NAMESIZE) {
        char *p = if_indextoname(ifindex, buf);
        if (p)
            return (strlen(p));
    }

    /* last resort */
    n = snprintf(buf, bufsiz, "%u", sa6->sin6_scope_id);
    if (n < 0 || n >= bufsiz)
        return -1;
    else
        return n;
}
#endif /* INET6 */
#endif
Commit	Line	Data
0e076fb1	1	/*
	2	* Shamelessly duplicated from the fetchmail public sources
	3	* for use by the Squid Project under GNU Public License.
	4	*
	5	* Update/Maintenance History:
	6	*
	7	* 16-Aug-2007 : Copied from fetchmail 6.3.8
	8	* - added protection around libray headers
	9	* - added use of alternative name xgetnameinfo
	10	* to split from any OS-provided.
	11	*
	12	* 06-Oct-2007 : Various fixes to allow the build on MinGW
	13	* - use srtncpy instead of strlcpy
	14	* - use xinet_ntop instead of inet_ntop
	15	* - use SQUIDHOSTNAMELEN instead of MAXHOSTNAMELEN
	16	*
0e076fb1	17	* Original License and code follows.
0e076fb1	18	*/
f7f3304a	19	#include "squid.h"
0e076fb1	20
	21	/* KAME: getnameinfo.c,v 1.72 2005/01/13 04:12:03 itojun Exp */
	22
	23	/*
	24	* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
	25	* All rights reserved.
	26	*
	27	* Redistribution and use in source and binary forms, with or without
	28	* modification, are permitted provided that the following conditions
	29	* are met:
	30	* 1. Redistributions of source code must retain the above copyright
	31	* notice, this list of conditions and the following disclaimer.
	32	* 2. Redistributions in binary form must reproduce the above copyright
	33	* notice, this list of conditions and the following disclaimer in the
	34	* documentation and/or other materials provided with the distribution.
	35	* 3. Neither the name of the project nor the names of its contributors
	36	* may be used to endorse or promote products derived from this software
	37	* without specific prior written permission.
	38	*
	39	* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
	40	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	41	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	42	* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
	43	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	44	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	45	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	46	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	47	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	48	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	49	* SUCH DAMAGE.
	50	*/
	51
	52	/*
	53	* Issues to be discussed:
	54	* - RFC2553 says that we should raise error on short buffer. X/Open says
	55	* we need to truncate the result. We obey RFC2553 (and X/Open should be
	56	* modified). ipngwg rough consensus seems to follow RFC2553. RFC3493 says
	57	* nothing about it, but defines a new error code EAI_OVERFLOW which seems
	58	* to be intended the code for this case.
	59	* - What is "local" in NI_NOFQDN? (see comments in the code)
	60	* - NI_NAMEREQD and NI_NUMERICHOST conflict with each other.
	61	* - (KAME extension) always attach textual scopeid (fe80::1%lo0), if
	62	* sin6_scope_id is filled - standardization status?
	63	* - what should we do if we should do getservbyport("sctp")?
	64	*/
	65
	66	/*
	67	* Considerations about thread-safeness
	68	* The code in this file is thread-safe, and so the thread-safeness of
	69	* getnameinfo() depends on the property of backend functions.
	70	* - getservbyport() is not thread safe for most systems we are targeting.
	71	* - getipnodebyaddr() is thread safe. However, many resolver libraries
	72	* used in the function are not thread safe.
	73	* - gethostbyaddr() is usually not thread safe.
	74	*/
	75
32d002cb	76	#if !HAVE_GETNAMEINFO
0e076fb1	77
27bc2077	78	#include "compat/getaddrinfo.h"
602d9612	79	#include "compat/inet_ntop.h"
27bc2077	80
0e076fb1	81	#if HAVE_SYS_SOCKET_H
	82	#include <sys/socket.h>
	83	#endif
	84	#if HAVE_NET_IF_H
	85	#include <net/if.h>
	86	#endif
	87	#if HAVE_NETINET_IN_H
	88	#include <netinet/in.h>
	89	#endif
	90	#if HAVE_ARPA_INET_H
	91	#include <arpa/inet.h>
	92	#endif
	93	#if HAVE_ARPA_NAMESER_H
	94	#include <arpa/nameser.h>
	95	#endif
	96	#if HAVE_NETDB_H
	97	#include <netdb.h>
	98	#endif
	99	#if HAVE_RESOLV_H
	100	#include <resolv.h>
	101	#endif
	102	#if HAVE_STRING_H
	103	#include <string.h>
	104	#endif
	105	#if HAVE_STDDEF_H
	106	#include <stddef.h>
	107	#endif
	108	#if HAVE_ERRNO_H
	109	#include <errno.h>
	110	#endif
	111	#if HAVE_INTTYPES_H
	112	#include <inttypes.h>
	113	#endif
	114
7aa9bb3e	115	#if _SQUID_WINDOWS_
0e076fb1	116	#undef IN_ADDR
	117	#include <ws2tcpip.h>
	118	#endif
	119
0e076fb1	120	static const struct afd {
26ac0430 AJ	121	int a_af;
	122	int a_addrlen;
	123	int a_socklen;
	124	int a_off;
	125	int a_portoff;
0e076fb1	126	} afdl [] = {
32d002cb	127	#if INET6
26ac0430 AJ	128	{PF_INET6, sizeof(struct in6_addr), sizeof(struct sockaddr_in6),
	129	offsetof(struct sockaddr_in6, sin6_addr),
	130	offsetof(struct sockaddr_in6, sin6_port)},
0e076fb1	131	#endif
26ac0430 AJ	132	{PF_INET, sizeof(struct in_addr), sizeof(struct sockaddr_in),
	133	offsetof(struct sockaddr_in, sin_addr),
	134	offsetof(struct sockaddr_in, sin_port)},
	135	{0, 0, 0, 0, 0},
0e076fb1	136	};
0e076fb1	137
32d002cb	138	#if INET6
0e076fb1	139	static int ip6_parsenumeric __P((const struct sockaddr , const char , char *,
26ac0430	140	size_t, int));
0e076fb1	141	static int ip6_sa2str __P((const struct sockaddr_in6 , char , size_t, int));
	142	#endif
	143
	144	int
	145	xgetnameinfo(sa, salen, host, hostlen, serv, servlen, flags)
26ac0430 AJ	146	const struct sockaddr *sa;
	147	socklen_t salen;
	148	char *host;
	149	size_t hostlen;
	150	char *serv;
	151	size_t servlen;
	152	int flags;
0e076fb1	153	{
26ac0430 AJ	154	const struct afd *afd;
	155	struct servent *sp;
	156	struct hostent *hp;
f45dd259	157	unsigned short port;
26ac0430 AJ	158	int family, i;
26ac0430 AJ	159	const char *addr;
09aabd84	160	uint32_t v4a;
26ac0430 AJ	161	char numserv[512];
	162
	163	if (sa == NULL)
	164	return EAI_FAIL;
0e076fb1	165
32d002cb	166	#if HAVE_SA_LEN /XXX/
26ac0430 AJ	167	if (sa->sa_len != salen)
26ac0430 AJ	168	return EAI_FAIL;
0e076fb1	169	#endif
0e076fb1	170
26ac0430 AJ	171	family = sa->sa_family;
	172	for (i = 0; afdl[i].a_af; i++)
	173	if (afdl[i].a_af == family) {
	174	afd = &afdl[i];
	175	goto found;
	176	}
	177	return EAI_FAMILY;
	178
	179	found:
	180	if (salen != afd->a_socklen)
	181	return EAI_FAIL;
	182
	183	/* network byte order */
	184	memcpy(&port, (const char *)sa + afd->a_portoff, sizeof(port));
	185	addr = (const char *)sa + afd->a_off;
	186
	187	if (serv == NULL \|\| servlen == 0) {
	188	/*
	189	* do nothing in this case.
	190	* in case you are wondering if "&&" is more correct than
	191	* "\|\|" here: RFC3493 says that serv == NULL OR servlen == 0
	192	* means that the caller does not want the result.
	193	*/
	194	} else {
	195	if (flags & NI_NUMERICSERV)
	196	sp = NULL;
	197	else {
	198	sp = getservbyport(port,
	199	(flags & NI_DGRAM) ? "udp" : "tcp");
	200	}
	201	if (sp) {
	202	if (strlen(sp->s_name) + 1 > servlen)
	203	return EAI_OVERFLOW;
	204	strncpy(serv, sp->s_name, servlen);
	205	} else {
	206	snprintf(numserv, sizeof(numserv), "%u", ntohs(port));
	207	if (strlen(numserv) + 1 > servlen)
	208	return EAI_OVERFLOW;
	209	strncpy(serv, numserv, servlen);
	210	}
	211	}
	212
	213	switch (sa->sa_family) {
	214	case AF_INET:
09aabd84	215	v4a = (uint32_t)
26ac0430 AJ	216	ntohl(((const struct sockaddr_in *)sa)->sin_addr.s_addr);
	217	if (IN_MULTICAST(v4a) \|\| IN_EXPERIMENTAL(v4a))
	218	flags \|= NI_NUMERICHOST;
	219	v4a >>= IN_CLASSA_NSHIFT;
	220	if (v4a == 0)
	221	flags \|= NI_NUMERICHOST;
	222	break;
32d002cb	223	#if INET6
26ac0430 AJ	224	case AF_INET6: {
	225	const struct sockaddr_in6 *sin6;
	226	sin6 = (const struct sockaddr_in6 *)sa;
	227	switch (sin6->sin6_addr.s6_addr[0]) {
	228	case 0x00:
	229	if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
	230	;
	231	else if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr))
	232	;
	233	else
	234	flags \|= NI_NUMERICHOST;
	235	break;
	236	default:
	237	if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
	238	flags \|= NI_NUMERICHOST;
	239	else if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
	240	flags \|= NI_NUMERICHOST;
	241	break;
	242	}
	243	}
	244	break;
0e076fb1	245	#endif
26ac0430 AJ	246	}
	247	if (host == NULL \|\| hostlen == 0) {
	248	/*
	249	* do nothing in this case.
	250	* in case you are wondering if "&&" is more correct than
	251	* "\|\|" here: RFC3493 says that host == NULL or hostlen == 0
	252	* means that the caller does not want the result.
	253	*/
	254	} else if (flags & NI_NUMERICHOST) {
	255	/* NUMERICHOST and NAMEREQD conflicts with each other */
	256	if (flags & NI_NAMEREQD)
	257	return EAI_NONAME;
	258
	259	goto numeric;
	260	} else {
32d002cb	261	#if USE_GETIPNODEBY
5b10eaba	262	int h_error = 0;
26ac0430	263	hp = getipnodebyaddr(addr, afd->a_addrlen, afd->a_af, &h_error);
0e076fb1	264	#else
26ac0430	265	hp = gethostbyaddr(addr, afd->a_addrlen, afd->a_af);
5b10eaba	266	#if 0 // getnameinfo.c:161:9: error: variable 'h_error' set but not used
32d002cb	267	#if HAVE_H_ERRNO
26ac0430	268	h_error = h_errno;
0e076fb1	269	#else
26ac0430	270	h_error = EINVAL;
0e076fb1	271	#endif
5b10eaba	272	#endif /* 0 */
0e076fb1	273	#endif
0e076fb1	274
26ac0430	275	if (hp) {
0e076fb1	276	#if 0
26ac0430 AJ	277	if (flags & NI_NOFQDN) {
	278	/*
	279	* According to RFC3493 section 6.2, NI_NOFQDN
	280	* means "node name portion of the FQDN shall
	281	* be returned for local hosts." The following
	282	* code tries to implement it by returning the
	283	* first label (the part before the first
	284	* period) of the FQDN. However, it is not
	285	* clear if this always makes sense, since the
	286	* given address may be outside of "local
	287	* hosts." Due to the unclear description, we
	288	* disable the code in this implementation.
	289	*/
	290	char *p;
	291	p = strchr(hp->h_name, '.');
	292	if (p)
	293	*p = '\0';
	294	}
0e076fb1	295	#endif
26ac0430	296	if (strlen(hp->h_name) + 1 > hostlen) {
32d002cb	297	#if USE_GETIPNODEBY
26ac0430	298	freehostent(hp);
0e076fb1	299	#endif
26ac0430 AJ	300	return EAI_OVERFLOW;
	301	}
	302	strncpy(host, hp->h_name, hostlen);
32d002cb	303	#if USE_GETIPNODEBY
26ac0430	304	freehostent(hp);
0e076fb1	305	#endif
26ac0430 AJ	306	} else {
	307	if (flags & NI_NAMEREQD)
	308	return EAI_NONAME;
0e076fb1	309
26ac0430 AJ	310	numeric:
26ac0430 AJ	311	switch (afd->a_af) {
32d002cb	312	#if INET6
26ac0430 AJ	313	case AF_INET6: {
	314	int error;
	315
	316	if ((error = ip6_parsenumeric(sa, addr, host,
	317	hostlen,
	318	flags)) != 0)
	319	return(error);
	320	break;
	321	}
0e076fb1	322	#endif
26ac0430	323	default:
27bc2077	324	if (inet_ntop(afd->a_af, addr, host,
b1c8a478	325	hostlen) == NULL)
26ac0430 AJ	326	return EAI_SYSTEM;
	327	break;
	328	}
	329	}
	330	}
	331	return(0);
0e076fb1	332	}
0e076fb1	333
32d002cb	334	#if INET6
0e076fb1	335	static int
0e076fb1	336	ip6_parsenumeric(sa, addr, host, hostlen, flags)
26ac0430 AJ	337	const struct sockaddr *sa;
	338	const char *addr;
	339	char *host;
	340	size_t hostlen;
	341	int flags;
0e076fb1	342	{
26ac0430 AJ	343	int numaddrlen;
	344	char numaddr[512];
	345
27bc2077	346	if (inet_ntop(AF_INET6, addr, numaddr, sizeof(numaddr)) == NULL)
26ac0430 AJ	347	return EAI_SYSTEM;
	348
	349	numaddrlen = strlen(numaddr);
	350	if (numaddrlen + 1 > hostlen) /* don't forget terminator */
	351	return EAI_OVERFLOW;
	352	strncpy(host, numaddr, hostlen);
	353
	354	if (((const struct sockaddr_in6 *)sa)->sin6_scope_id) {
	355	char zonebuf[SQUIDHOSTNAMELEN];
	356	int zonelen;
	357
	358	zonelen = ip6_sa2str(
	359	(const struct sockaddr_in6 )(const void )sa,
	360	zonebuf, sizeof(zonebuf), flags);
	361	if (zonelen < 0)
	362	return EAI_OVERFLOW;
	363	if (zonelen + 1 + numaddrlen + 1 > hostlen)
	364	return EAI_OVERFLOW;
	365
	366	/* construct <numeric-addr><delim><zoneid> */
	367	memcpy(host + numaddrlen + 1, zonebuf,
	368	(size_t)zonelen);
	369	host[numaddrlen] = SCOPE_DELIMITER;
	370	host[numaddrlen + 1 + zonelen] = '\0';
	371	}
	372
	373	return 0;
0e076fb1	374	}
	375
	376	/* ARGSUSED */
	377	static int
	378	ip6_sa2str(sa6, buf, bufsiz, flags)
26ac0430 AJ	379	const struct sockaddr_in6 *sa6;
	380	char *buf;
	381	size_t bufsiz;
	382	int flags;
0e076fb1	383	{
26ac0430 AJ	384	unsigned int ifindex;
	385	const struct in6_addr *a6;
	386	int n;
0e076fb1	387
26ac0430 AJ	388	ifindex = (unsigned int)sa6->sin6_scope_id;
26ac0430 AJ	389	a6 = &sa6->sin6_addr;
0e076fb1	390
32d002cb	391	#if NI_NUMERICSCOPE
26ac0430 AJ	392	if ((flags & NI_NUMERICSCOPE) != 0) {
	393	n = snprintf(buf, bufsiz, "%u", sa6->sin6_scope_id);
	394	if (n < 0 \|\| n >= bufsiz)
	395	return -1;
	396	else
	397	return n;
	398	}
0e076fb1	399	#endif
0e076fb1	400
26ac0430 AJ	401	/* if_indextoname() does not take buffer size. not a good api... */
	402	if ((IN6_IS_ADDR_LINKLOCAL(a6) \|\| IN6_IS_ADDR_MC_LINKLOCAL(a6) \|\|
	403	IN6_IS_ADDR_MC_NODELOCAL(a6)) && bufsiz >= IF_NAMESIZE) {
	404	char *p = if_indextoname(ifindex, buf);
	405	if (p)
	406	return (strlen(p));
	407	}
	408
	409	/* last resort */
	410	n = snprintf(buf, bufsiz, "%u", sa6->sin6_scope_id);
	411	if (n < 0 \|\| n >= bufsiz)
	412	return -1;
	413	else
	414	return n;
0e076fb1	415	}
	416	#endif /* INET6 */
	417	#endif