path: root/jni/ruby/ext/socket/getaddrinfo.c

/*
 * 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.
 */

/*
 * "#ifdef FAITH" part is local hack for supporting IPv4-v6 translator.
 *
 * Issues to be discussed:
 * - Thread safe-ness must be checked.
 * - Return values.  There are nonstandard return values defined and used
 *   in the source code.  This is because RFC2133 is silent about which error
 *   code must be returned for which situation.
 * - PF_UNSPEC case would be handled in getipnodebyname() with the AI_ALL flag.
 */

#include "ruby/config.h"
#ifdef RUBY_EXTCONF_H
#include RUBY_EXTCONF_H
#endif
#include <sys/types.h>
#ifndef _WIN32
#include <sys/param.h>
#if defined(__BEOS__) && !defined(__HAIKU__) && !defined(BONE)
# include <net/socket.h>
#else
# include <sys/socket.h>
#endif
#include <netinet/in.h>
#if defined(HAVE_ARPA_INET_H)
#include <arpa/inet.h>
#endif
#if defined(HAVE_ARPA_NAMESER_H)
#include <arpa/nameser.h>
#endif
#include <netdb.h>
#if defined(HAVE_RESOLV_H)
#ifdef _SX
#include <stdio.h>
#endif
#include <resolv.h>
#endif
#include <unistd.h>
#else
#include <winsock2.h>
#include <ws2tcpip.h>
#include <io.h>
#endif
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <ctype.h>

#ifdef SOCKS5
#include <socks.h>
#endif

#ifndef HAVE_TYPE_SOCKLEN_T
typedef int socklen_t;
#endif

#include "addrinfo.h"
#include "sockport.h"

#define SUCCESS 0
#define ANY 0
#define YES 1
#define NO  0

#ifdef FAITH
static int translate = NO;
static struct in6_addr faith_prefix = IN6ADDR_ANY_INIT;
#endif

static const char in_addrany[] = { 0, 0, 0, 0 };
static const char in6_addrany[] = {
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
static const char in_loopback[] = { 127, 0, 0, 1 };
static const char in6_loopback[] = {
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
};

struct sockinet {
        u_char  si_len;
        u_char  si_family;
        u_short si_port;
};

static const struct afd {
        int a_af;
        int a_addrlen;
        int a_socklen;
        int a_off;
        const char *a_addrany;
        const char *a_loopback;
} afdl [] = {
#ifdef INET6
#define N_INET6 0
        {PF_INET6, sizeof(struct in6_addr),
         sizeof(struct sockaddr_in6),
         offsetof(struct sockaddr_in6, sin6_addr),
         in6_addrany, in6_loopback},
#define N_INET  1
#else
#define N_INET  0
#endif
        {PF_INET, sizeof(struct in_addr),
         sizeof(struct sockaddr_in),
         offsetof(struct sockaddr_in, sin_addr),
         in_addrany, in_loopback},
        {0, 0, 0, 0, NULL, NULL},
};

#ifdef INET6
#define PTON_MAX        16
#else
#define PTON_MAX        4
#endif

static int get_name __P((const char *, const struct afd *,
                          struct addrinfo **, char *, struct addrinfo *,
                          int));
static int get_addr __P((const char *, int, struct addrinfo **,
                        struct addrinfo *, int));
static int str_isnumber __P((const char *));

static const char *const ai_errlist[] = {
        "success.",
        "address family for hostname not supported.",   /* EAI_ADDRFAMILY */
        "temporary failure in name resolution.",        /* EAI_AGAIN      */
        "invalid value for ai_flags.",                  /* EAI_BADFLAGS   */
        "non-recoverable failure in name resolution.",  /* EAI_FAIL       */
        "ai_family not supported.",                     /* EAI_FAMILY     */
        "memory allocation failure.",                   /* EAI_MEMORY     */
        "no address associated with hostname.",         /* EAI_NODATA     */
        "hostname nor servname provided, or not known.",/* EAI_NONAME     */
        "servname not supported for ai_socktype.",      /* EAI_SERVICE    */
        "ai_socktype not supported.",                   /* EAI_SOCKTYPE   */
        "system error returned in errno.",              /* EAI_SYSTEM     */
        "invalid value for hints.",                     /* EAI_BADHINTS   */
        "resolved protocol is unknown.",                /* EAI_PROTOCOL   */
        "unknown error.",                               /* EAI_MAX        */
};

#define GET_CANONNAME(ai, str) \
if (pai->ai_flags & AI_CANONNAME) {\
        if (((ai)->ai_canonname = (char *)malloc(strlen(str) + 1)) != NULL) {\
                strcpy((ai)->ai_canonname, (str));\
        } else {\
                error = EAI_MEMORY;\
                goto free;\
        }\
}

#define GET_AI(ai, afd, addr, port) {\
        char *p;\
        if (((ai) = (struct addrinfo *)malloc(sizeof(struct addrinfo) +\
                                              ((afd)->a_socklen)))\
            == NULL) {\
                error = EAI_MEMORY;\
                goto free;\
        }\
        memcpy((ai), pai, sizeof(struct addrinfo));\
        (ai)->ai_addr = (struct sockaddr *)((ai) + 1);\
        (ai)->ai_family = (afd)->a_af;\
        (ai)->ai_addrlen = (afd)->a_socklen;\
        INIT_SOCKADDR((ai)->ai_addr, (afd)->a_af, (afd)->a_socklen);\
        ((struct sockinet *)(ai)->ai_addr)->si_port = (port);\
        p = (char *)((ai)->ai_addr);\
        memcpy(p + (afd)->a_off, (addr), (afd)->a_addrlen);\
}

#define ERR(err) { error = (err); goto bad; }

#ifndef HAVE_GAI_STRERROR
#ifdef GAI_STRERROR_CONST
const
#endif
char *
gai_strerror(int ecode)
{
        if (ecode < 0 || ecode > EAI_MAX)
                ecode = EAI_MAX;
        return (char *)ai_errlist[ecode];
}
#endif

void
freeaddrinfo(struct addrinfo *ai)
{
        struct addrinfo *next;

        do {
                next = ai->ai_next;
                if (ai->ai_canonname)
                        free(ai->ai_canonname);
                /* no need to free(ai->ai_addr) */
                free(ai);
        } while ((ai = next) != NULL);
}

static int
str_isnumber(const char *p)
{
        char *q = (char *)p;
        while (*q) {
                if (! isdigit(*q))
                        return NO;
                q++;
        }
        return YES;
}

#ifndef HAVE_INET_PTON

static int
inet_pton(int af, const char *hostname, void *pton)
{
        struct in_addr in;

#ifdef HAVE_INET_ATON
        if (!inet_aton(hostname, &in))
            return 0;
#else
        int d1, d2, d3, d4;
        char ch;

        if (sscanf(hostname, "%d.%d.%d.%d%c", &d1, &d2, &d3, &d4, &ch) == 4 &&
            0 <= d1 && d1 <= 255 && 0 <= d2 && d2 <= 255 &&
            0 <= d3 && d3 <= 255 && 0 <= d4 && d4 <= 255) {
            in.s_addr = htonl(
                ((long) d1 << 24) | ((long) d2 << 16) |
                ((long) d3 << 8) | ((long) d4 << 0));
        }
        else {
            return 0;
        }
#endif
        memcpy(pton, &in, sizeof(in));
        return 1;
}
#endif

int
getaddrinfo(const char *hostname, const char *servname, const struct addrinfo *hints, struct addrinfo **res)
{
        struct addrinfo sentinel;
        struct addrinfo *top = NULL;
        struct addrinfo *cur;
        int i, error = 0;
        char pton[PTON_MAX];
        struct addrinfo ai;
        struct addrinfo *pai;
        u_short port;

#ifdef FAITH
        static int firsttime = 1;

        if (firsttime) {
                /* translator hack */
                {
                        char *q = getenv("GAI");
                        if (q && inet_pton(AF_INET6, q, &faith_prefix) == 1)
                                translate = YES;
                }
                firsttime = 0;
        }
#endif

        /* initialize file static vars */
        sentinel.ai_next = NULL;
        cur = &sentinel;
        pai = &ai;
        pai->ai_flags = 0;
        pai->ai_family = PF_UNSPEC;
        pai->ai_socktype = ANY;
        pai->ai_protocol = ANY;
        pai->ai_addrlen = 0;
        pai->ai_canonname = NULL;
        pai->ai_addr = NULL;
        pai->ai_next = NULL;
        port = ANY;

        if (hostname == NULL && servname == NULL)
                return EAI_NONAME;
        if (hints) {
                /* error check for hints */
                if (hints->ai_addrlen || hints->ai_canonname ||
                    hints->ai_addr || hints->ai_next)
                        ERR(EAI_BADHINTS); /* xxx */
                if (hints->ai_flags & ~AI_MASK)
                        ERR(EAI_BADFLAGS);
                switch (hints->ai_family) {
                case PF_UNSPEC:
                case PF_INET:
#ifdef INET6
                case PF_INET6:
#endif
                        break;
                default:
                        ERR(EAI_FAMILY);
                }
                memcpy(pai, hints, sizeof(*pai));
                switch (pai->ai_socktype) {
                case ANY:
                        switch (pai->ai_protocol) {
                        case ANY:
                                break;
                        case IPPROTO_UDP:
                                pai->ai_socktype = SOCK_DGRAM;
                                break;
                        case IPPROTO_TCP:
                                pai->ai_socktype = SOCK_STREAM;
                                break;
                        default:
#if defined(SOCK_RAW)
                                pai->ai_socktype = SOCK_RAW;
#endif
                                break;
                        }
                        break;
#if defined(SOCK_RAW)
                case SOCK_RAW:
                        break;
#endif
                case SOCK_DGRAM:
                        if (pai->ai_protocol != IPPROTO_UDP &&
                            pai->ai_protocol != ANY)
                                ERR(EAI_BADHINTS);      /*xxx*/
                        pai->ai_protocol = IPPROTO_UDP;
                        break;
                case SOCK_STREAM:
                        if (pai->ai_protocol != IPPROTO_TCP &&
                            pai->ai_protocol != ANY)
                                ERR(EAI_BADHINTS);      /*xxx*/
                        pai->ai_protocol = IPPROTO_TCP;
                        break;
                default:
                        ERR(EAI_SOCKTYPE);
                        break;
                }
        }

        /*
         * service port
         */
        if (servname) {
                if (str_isnumber(servname)) {
                        if (pai->ai_socktype == ANY) {