path: root/contrib/libs/openssl/crypto/bio/b_addr.c

/* 
 * Copyright 2016-2021 The OpenSSL Project Authors. All Rights Reserved.
 * 
 * Licensed under the OpenSSL license (the "License").  You may not use 
 * this file except in compliance with the License.  You can obtain a copy 
 * in the file LICENSE in the source distribution or at 
 * https://www.openssl.org/source/license.html 
 */ 
 
#ifndef _GNU_SOURCE
# define _GNU_SOURCE
#endif

#include <assert.h> 
#include <string.h> 
 
#include "bio_local.h"
#include <openssl/crypto.h> 
 
#ifndef OPENSSL_NO_SOCK 
#include <openssl/err.h> 
#include <openssl/buffer.h> 
#include "internal/thread_once.h" 
 
CRYPTO_RWLOCK *bio_lookup_lock; 
static CRYPTO_ONCE bio_lookup_init = CRYPTO_ONCE_STATIC_INIT; 
 
/* 
 * Throughout this file and bio_local.h, the existence of the macro
 * AI_PASSIVE is used to detect the availability of struct addrinfo, 
 * getnameinfo() and getaddrinfo().  If that macro doesn't exist, 
 * we use our own implementation instead, using gethostbyname, 
 * getservbyname and a few other. 
 */ 
 
/********************************************************************** 
 * 
 * Address structure 
 * 
 */ 
 
BIO_ADDR *BIO_ADDR_new(void) 
{ 
    BIO_ADDR *ret = OPENSSL_zalloc(sizeof(*ret)); 
 
    if (ret == NULL) { 
        BIOerr(BIO_F_BIO_ADDR_NEW, ERR_R_MALLOC_FAILURE); 
        return NULL; 
    } 
 
    ret->sa.sa_family = AF_UNSPEC; 
    return ret; 
} 
 
void BIO_ADDR_free(BIO_ADDR *ap) 
{ 
    OPENSSL_free(ap); 
} 
 
void BIO_ADDR_clear(BIO_ADDR *ap) 
{ 
    memset(ap, 0, sizeof(*ap)); 
    ap->sa.sa_family = AF_UNSPEC; 
} 
 
/* 
 * BIO_ADDR_make - non-public routine to fill a BIO_ADDR with the contents 
 * of a struct sockaddr. 
 */ 
int BIO_ADDR_make(BIO_ADDR *ap, const struct sockaddr *sa) 
{ 
    if (sa->sa_family == AF_INET) { 
        memcpy(&(ap->s_in), sa, sizeof(struct sockaddr_in)); 
        return 1; 
    } 
#ifdef AF_INET6 
    if (sa->sa_family == AF_INET6) { 
        memcpy(&(ap->s_in6), sa, sizeof(struct sockaddr_in6)); 
        return 1; 
    } 
#endif 
#ifdef AF_UNIX 
    if (sa->sa_family == AF_UNIX) { 
        memcpy(&(ap->s_un), sa, sizeof(struct sockaddr_un)); 
        return 1; 
    } 
#endif 
 
    return 0; 
} 
 
int BIO_ADDR_rawmake(BIO_ADDR *ap, int family, 
                     const void *where, size_t wherelen, 
                     unsigned short port) 
{ 
#ifdef AF_UNIX 
    if (family == AF_UNIX) { 
        if (wherelen + 1 > sizeof(ap->s_un.sun_path)) 
            return 0; 
        memset(&ap->s_un, 0, sizeof(ap->s_un)); 
        ap->s_un.sun_family = family; 
        strncpy(ap->s_un.sun_path, where, sizeof(ap->s_un.sun_path) - 1); 
        return 1; 
    } 
#endif 
    if (family == AF_INET) { 
        if (wherelen != sizeof(struct in_addr)) 
            return 0; 
        memset(&ap->s_in, 0, sizeof(ap->s_in)); 
        ap->s_in.sin_family = family; 
        ap->s_in.sin_port = port; 
        ap->s_in.sin_addr = *(struct in_addr *)where; 
        return 1; 
    } 
#ifdef AF_INET6 
    if (family == AF_INET6) { 
        if (wherelen != sizeof(struct in6_addr)) 
            return 0; 
        memset(&ap->s_in6, 0, sizeof(ap->s_in6)); 
        ap->s_in6.sin6_family = family; 
        ap->s_in6.sin6_port = port; 
        ap->s_in6.sin6_addr = *(struct in6_addr *)where; 
        return 1; 
    } 
#endif 
 
    return 0; 
} 
 
int BIO_ADDR_family(const BIO_ADDR *ap) 
{ 
    return ap->sa.sa_family; 
} 
 
int BIO_ADDR_rawaddress(const BIO_ADDR *ap, void *p, size_t *l) 
{ 
    size_t len = 0; 
    const void *addrptr = NULL; 
 
    if (ap->sa.sa_family == AF_INET) { 
        len = sizeof(ap->s_in.sin_addr); 
        addrptr = &ap->s_in.sin_addr; 
    } 
#ifdef AF_INET6 
    else if (ap->sa.sa_family == AF_INET6) { 
        len = sizeof(ap->s_in6.sin6_addr); 
        addrptr = &ap->s_in6.sin6_addr; 
    } 
#endif 
#ifdef AF_UNIX 
    else if (ap->sa.sa_family == AF_UNIX) { 
        len = strlen(ap->s_un.sun_path); 
        addrptr = &ap->s_un.sun_path; 
    } 
#endif 
 
    if (addrptr == NULL) 
        return 0; 
 
    if (p != NULL) { 
        memcpy(p, addrptr, len); 
    } 
    if (l != NULL) 
        *l = len; 
 
    return 1; 
} 
 
unsigned short BIO_ADDR_rawport(const BIO_ADDR *ap) 
{ 
    if (ap->sa.sa_family == AF_INET) 
        return ap->s_in.sin_port; 
#ifdef AF_INET6 
    if (ap->sa.sa_family == AF_INET6) 
        return ap->s_in6.sin6_port; 
#endif 
    return 0; 
} 
 
/*- 
 * addr_strings - helper function to get host and service names 
 * @ap: the BIO_ADDR that has the input info 
 * @numeric: 0 if actual names should be returned, 1 if the numeric 
 * representation should be returned. 
 * @hostname: a pointer to a pointer to a memory area to store the 
 * host name or numeric representation.  Unused if NULL. 
 * @service: a pointer to a pointer to a memory area to store the 
 * service name or numeric representation.  Unused if NULL. 
 * 
 * The return value is 0 on failure, with the error code in the error 
 * stack, and 1 on success. 
 */ 
static int addr_strings(const BIO_ADDR *ap, int numeric, 
                        char **hostname, char **service) 
{ 
    if (BIO_sock_init() != 1) 
        return 0; 
 
    if (1) { 
#ifdef AI_PASSIVE 
        int ret = 0; 
        char host[NI_MAXHOST] = "", serv[NI_MAXSERV] = ""; 
        int flags = 0; 
 
        if (numeric) 
            flags |= NI_NUMERICHOST | NI_NUMERICSERV; 
 
        if ((ret = getnameinfo(BIO_ADDR_sockaddr(ap), 
                               BIO_ADDR_sockaddr_size(ap), 
                               host, sizeof(host), serv, sizeof(serv), 
                               flags)) != 0) { 
# ifdef EAI_SYSTEM 
            if (ret == EAI_SYSTEM) { 
                SYSerr(SYS_F_GETNAMEINFO, get_last_socket_error()); 
                BIOerr(BIO_F_ADDR_STRINGS, ERR_R_SYS_LIB); 
            } else 
# endif 
            { 
                BIOerr(BIO_F_ADDR_STRINGS, ERR_R_SYS_LIB); 
                ERR_add_error_data(1, gai_strerror(ret)); 
            } 
            return 0; 
        } 
 
        /* VMS getnameinfo() has a bug, it doesn't fill in serv, which 
         * leaves it with whatever garbage that happens to be there. 
         * However, we initialise serv with the empty string (serv[0] 
         * is therefore NUL), so it gets real easy to detect when things 
         * didn't go the way one might expect. 
         */ 
        if (serv[0] == '\0') { 
            BIO_snprintf(serv, sizeof(serv), "%d", 
                         ntohs(BIO_ADDR_rawport(ap))); 
        } 
 
        if (hostname != NULL) 
            *hostname = OPENSSL_strdup(host); 
        if (service != NULL) 
            *service = OPENSSL_strdup(serv); 
    } else { 
#endif 
        if (hostname != NULL) 
            *hostname = OPENSSL_strdup(inet_ntoa(ap->s_in.sin_addr)); 
        if (service != NULL) { 
            char serv[6];        /* port is 16 bits => max 5 decimal digits */ 
            BIO_snprintf(serv, sizeof(serv), "%d", ntohs(ap->s_in.sin_port)); 
            *service = OPENSSL_strdup(serv); 
        } 
    } 
 
    if ((hostname != NULL && *hostname == NULL) 
            || (service != NULL && *service == NULL)) { 
        if (hostname != NULL) { 
            OPENSSL_free(*hostname); 
            *hostname = NULL; 
        } 
        if (service != NULL) { 
            OPENSSL_free(*service); 
            *service = NULL; 
        } 
        BIOerr(BIO_F_ADDR_STRINGS, ERR_R_MALLOC_FAILURE); 
        return 0; 
    } 
 
    return 1; 
} 
 
char *BIO_ADDR_hostname_string(const BIO_ADDR *ap, int numeric) 
{ 
    char *hostname = NULL; 
 
    if (addr_strings(ap, numeric, &hostname, NULL)) 
        return hostname; 
 
    return NULL; 
} 
 
char *BIO_ADDR_service_string(const BIO_ADDR *ap, int numeric) 
{ 
    char *service = NULL; 
 
    if (addr_strings(ap, numeric, NULL, &service)) 
        return service; 
 
    return NULL; 
} 
 
char *BIO_ADDR_path_string(const BIO_ADDR *ap) 
{ 
#ifdef AF_UNIX 
    if (ap->sa.sa_family == AF_UNIX) 
        return OPENSSL_strdup(ap->s_un.sun_path); 
#endif 
    return NULL; 
} 
 
/* 
 * BIO_ADDR_sockaddr - non-public routine to return the struct sockaddr 
 * for a given BIO_ADDR.  In reality, this is simply a type safe cast. 
 * The returned struct sockaddr is const, so it can't be tampered with. 
 */ 
const struct sockaddr *BIO_ADDR_sockaddr(const BIO_ADDR *ap) 
{ 
    return &(ap->sa); 
} 
 
/* 
 * BIO_ADDR_sockaddr_noconst - non-public function that does the same 
 * as BIO_ADDR_sockaddr, but returns a non-const.  USE WITH CARE, as 
 * it allows you to tamper with the data (and thereby the contents 
 * of the input BIO_ADDR). 
 */ 
struct sockaddr *BIO_ADDR_sockaddr_noconst(BIO_ADDR *ap) 
{ 
    return &(ap->sa); 
} 
 
/* 
 * BIO_ADDR_sockaddr_size - non-public function that returns the size 
 * of the struct sockaddr the BIO_ADDR is using.  If the protocol family 
 * isn't set or is something other than AF_INET, AF_INET6 or AF_UNIX, 
 * the size of the BIO_ADDR type is returned. 
 */ 
socklen_t BIO_ADDR_sockaddr_size(const BIO_ADDR *ap) 
{ 
    if (ap->sa.sa_family == AF_INET) 
        return sizeof(ap->s_in); 
#ifdef AF_INET6 
    if (ap->sa.sa_family == AF_INET6) 
        return sizeof(ap->s_in6); 
#endif 
#ifdef AF_UNIX 
    if (ap->sa.sa_family == AF_UNIX) 
        return sizeof(ap->s_un); 
#endif 
    return sizeof(*ap); 
} 
 
/********************************************************************** 
 * 
 * Address info database 
 * 
 */ 
 
const BIO_ADDRINFO *BIO_ADDRINFO_next(const BIO_ADDRINFO *bai) 
{ 
    if (bai != NULL) 
        return bai->bai_next; 
    return NULL; 
} 
 
int BIO_ADDRINFO_family(const BIO_ADDRINFO *bai) 
{ 
    if (bai != NULL) 
        return bai->bai_family; 
    return 0; 
} 
 
int BIO_ADDRINFO_socktype(const BIO_ADDRINFO *bai) 
{ 
    if (bai != NULL) 
        return bai->bai_socktype; 
    return 0; 
} 
 
int BIO_ADDRINFO_protocol(const BIO_ADDRINFO *bai) 
{ 
    if (bai != NULL) { 
        if (bai->bai_protocol != 0) 
            return bai->bai_protocol; 
 
#ifdef AF_UNIX 
        if (bai->bai_family == AF_UNIX) 
            return 0; 
#endif 
 
        switch (bai->bai_socktype) { 
        case SOCK_STREAM: 
            return IPPROTO_TCP; 
        case SOCK_DGRAM: 
            return IPPROTO_UDP; 
        default: 
            break; 
        } 
    } 
    return 0; 
} 
 
/* 
 * BIO_ADDRINFO_sockaddr_size - non-public function that returns the size 
 * of the struct sockaddr inside the BIO_ADDRINFO. 
 */ 
socklen_t BIO_ADDRINFO_sockaddr_size(const BIO_ADDRINFO *bai) 
{ 
    if (bai != NULL) 
        return bai->bai_addrlen; 
    return 0; 
} 
 
/* 
 * BIO_ADDRINFO_sockaddr - non-public function that returns bai_addr 
 * as the struct sockaddr it is. 
 */ 
const struct sockaddr *BIO_ADDRINFO_sockaddr(const BIO_ADDRINFO *bai) 
{ 
    if (bai != NULL) 
        return bai->bai_addr; 
    return NULL; 
} 
 
const BIO_ADDR *BIO_ADDRINFO_address(const BIO_ADDRINFO *bai) 
{ 
    if (bai != NULL) 
        return (BIO_ADDR *)bai->bai_addr; 
    return NULL; 
} 
 
void BIO_ADDRINFO_free(BIO_ADDRINFO *bai) 
{ 
    if (bai == NULL) 
        return; 
 
#ifdef AI_PASSIVE 
# ifdef AF_UNIX 
#  define _cond bai->bai_family != AF_UNIX 
# else 
#  define _cond 1 
# endif 
    if (_cond) { 
        freeaddrinfo(bai); 
        return; 
    } 
#endif 
 
    /* Free manually when we know that addrinfo_wrap() was used. 
     * See further comment above addrinfo_wrap() 
     */ 
    while (bai != NULL) { 
        BIO_ADDRINFO *next = bai->bai_next; 
        OPENSSL_free(bai->bai_addr); 
        OPENSSL_free(bai); 
        bai = next; 
    } 
} 
 
/********************************************************************** 
 * 
 * Service functions 
 * 
 */ 
 
/*- 
 * The specs in hostserv can take these forms: 
 * 
 * host:service         => *host = "host", *service = "service" 
 * host:*               => *host = "host", *service = NULL 
 * host:                => *host = "host", *service = NULL 
 * :service             => *host = NULL, *service = "service" 
 * *:service            => *host = NULL, *service = "service" 
 * 
 * in case no : is present in the string, the result depends on 
 * hostserv_prio, as follows: 
 * 
 * when hostserv_prio == BIO_PARSE_PRIO_HOST 
 * host                 => *host = "host", *service untouched 
 * 
 * when hostserv_prio == BIO_PARSE_PRIO_SERV 
 * service              => *host untouched, *service = "service" 
 * 
 */ 
int BIO_parse_hostserv(const char *hostserv, char **host, char **service, 
                       enum BIO_hostserv_priorities hostserv_prio) 
{ 
    const char *h = NULL; size_t hl = 0; 
    const char *p = NULL; size_t pl = 0; 
 
    if (*hostserv == '[') { 
        if ((p = strchr(hostserv, ']')) == NULL) 
            goto spec_err; 
        h = hostserv + 1; 
        hl = p - h; 
        p++; 
        if (*p == '\0') 
            p = NULL; 
        else if (*p != ':') 
            goto spec_err; 
        else { 
            p++; 
            pl = strlen(p); 
        } 
    } else { 
        const char *p2 = strrchr(hostserv, ':'); 
        p = strchr(hostserv, ':'); 
 
        /*- 
         * Check for more than one colon.  There are three possible 
         * interpretations: 
         * 1. IPv6 address with port number, last colon being separator. 
         * 2. IPv6 address only. 
         * 3. IPv6 address only if hostserv_prio == BIO_PARSE_PRIO_HOST, 
         *    IPv6 address and port number if hostserv_prio == BIO_PARSE_PRIO_SERV 
         * Because of this ambiguity, we currently choose to make it an 
         * error. 
         */ 
        if (p != p2) 
            goto amb_err; 
 
        if (p != NULL) { 
            h = hostserv; 
            hl = p - h; 
            p++; 
            pl = strlen(p); 
        } else if (hostserv_prio == BIO_PARSE_PRIO_HOST) { 
            h = hostserv; 
            hl = strlen(h); 
        } else { 
            p = hostserv; 
            pl = strlen(p); 
        } 
    } 
 
    if (p != NULL && strchr(p, ':')) 
        goto spec_err; 
 
    if (h != NULL && host != NULL) { 
        if (hl == 0 
            || (hl == 1 && h[0] == '*')) { 
            *host = NULL; 
        } else { 
            *host = OPENSSL_strndup(h, hl); 
            if (*host == NULL) 
                goto memerr; 
        } 
    } 
    if (p != NULL && service != NULL) { 
        if (pl == 0 
            || (pl == 1 && p[0] == '*')) { 
            *service = NULL; 
        } else { 
            *service = OPENSSL_strndup(p, pl); 
            if (*service == NULL) 
                goto memerr; 
        } 
    } 
 
    return 1; 
 amb_err: 
    BIOerr(BIO_F_BIO_PARSE_HOSTSERV, BIO_R_AMBIGUOUS_HOST_OR_SERVICE); 
    return 0; 
 spec_err: 
    BIOerr(BIO_F_BIO_PARSE_HOSTSERV, BIO_R_MALFORMED_HOST_OR_SERVICE); 
    return 0; 
 memerr: 
    BIOerr(BIO_F_BIO_PARSE_HOSTSERV, ERR_R_MALLOC_FAILURE); 
    return 0; 
} 
 
/* addrinfo_wrap is used to build our own addrinfo "chain". 
 * (it has only one entry, so calling it a chain may be a stretch) 
 * It should ONLY be called when getaddrinfo() and friends 
 * aren't available, OR when dealing with a non IP protocol 
 * family, such as AF_UNIX 
 * 
 * the return value is 1 on success, or 0 on failure, which 
 * only happens if a memory allocation error occurred. 
 */ 
static int addrinfo_wrap(int family, int socktype, 
                         const void *where, size_t wherelen, 
                         unsigned short port, 
                         BIO_ADDRINFO **bai) 
{ 
    if ((*bai = OPENSSL_zalloc(sizeof(**bai))) == NULL) { 
        BIOerr(BIO_F_ADDRINFO_WRAP, ERR_R_MALLOC_FAILURE); 
        return 0; 
    } 
 
    (*bai)->bai_family = family; 
    (*bai)->bai_socktype = socktype; 
    if (socktype == SOCK_STREAM) 
        (*bai)->bai_protocol = IPPROTO_TCP; 
    if (socktype == SOCK_DGRAM) 
        (*bai)->bai_protocol = IPPROTO_UDP; 
#ifdef AF_UNIX 
    if (family == AF_UNIX) 
        (*bai)->bai_protocol = 0; 
#endif 
    { 
        /* Magic: We know that BIO_ADDR_sockaddr_noconst is really 
           just an advanced cast of BIO_ADDR* to struct sockaddr * 
           by the power of union, so while it may seem that we're 
           creating a memory leak here, we are not.  It will be 
           all right. */ 
        BIO_ADDR *addr = BIO_ADDR_new(); 
        if (addr != NULL) { 
            BIO_ADDR_rawmake(addr, family, where, wherelen, port); 
            (*bai)->bai_addr = BIO_ADDR_sockaddr_noconst(addr); 
        } 
    } 
    (*bai)->bai_next = NULL; 
    if ((*bai)->bai_addr == NULL) { 
        BIO_ADDRINFO_free(*bai); 
        *bai = NULL; 
        return 0; 
    } 
    return 1; 
} 
 
DEFINE_RUN_ONCE_STATIC(do_bio_lookup_init) 
{ 
    if (!OPENSSL_init_crypto(0, NULL)) 
        return 0; 
    bio_lookup_lock = CRYPTO_THREAD_lock_new(); 
    return bio_lookup_lock != NULL; 
} 
 
int BIO_lookup(const char *host, const char *service, 
               enum BIO_lookup_type lookup_type, 
               int family, int socktype, BIO_ADDRINFO **res) 
{ 
    return BIO_lookup_ex(host, service, lookup_type, family, socktype, 0, res); 
} 
 
/*- 
 * BIO_lookup_ex - look up the node and service you want to connect to. 
 * @node: the node you want to connect to. 
 * @service: the service you want to connect to. 
 * @lookup_type: declare intent with the result, client or server. 
 * @family: the address family you want to use.  Use AF_UNSPEC for any, or 
 *  AF_INET, AF_INET6 or AF_UNIX. 
 * @socktype: The socket type you want to use.  Can be SOCK_STREAM, SOCK_DGRAM 
 *  or 0 for all. 
 * @protocol: The protocol to use, e.g. IPPROTO_TCP or IPPROTO_UDP or 0 for all. 
 *            Note that some platforms may not return IPPROTO_SCTP without 
 *            explicitly requesting it (i.e. IPPROTO_SCTP may not be returned 
 *            with 0 for the protocol) 
 * @res: Storage place for the resulting list of returned addresses 
 * 
 * This will do a lookup of the node and service that you want to connect to. 
 * It returns a linked list of different addresses you can try to connect to. 
 * 
 * When no longer needed you should call BIO_ADDRINFO_free() to free the result. 
 * 
 * The return value is 1 on success or 0 in case of error. 
 */ 
int BIO_lookup_ex(const char *host, const char *service, int lookup_type, 
                  int family, int socktype, int protocol, BIO_ADDRINFO **res) 
{ 
    int ret = 0;                 /* Assume failure */ 
 
    switch(family) { 
    case AF_INET: 
#ifdef AF_INET6 
    case AF_INET6: 
#endif 
#ifdef AF_UNIX 
    case AF_UNIX: 
#endif 
#ifdef AF_UNSPEC 
    case AF_UNSPEC: 
#endif 
        break; 
    default: 
        BIOerr(BIO_F_BIO_LOOKUP_EX, BIO_R_UNSUPPORTED_PROTOCOL_FAMILY); 
        return 0; 
    } 
 
#ifdef AF_UNIX 
    if (family == AF_UNIX) { 
        if (addrinfo_wrap(family, socktype, host, strlen(host), 0, res)) 
            return 1; 
        else 
            BIOerr(BIO_F_BIO_LOOKUP_EX, ERR_R_MALLOC_FAILURE); 
        return 0; 
    } 
#endif 
 
    if (BIO_sock_init() != 1) 
        return 0; 
 
    if (1) { 
#ifdef AI_PASSIVE 
        int gai_ret = 0, old_ret = 0;
        struct addrinfo hints; 
 
        memset(&hints, 0, sizeof(hints)); 
 
        hints.ai_family = family; 
        hints.ai_socktype = socktype; 
        hints.ai_protocol = protocol; 
# ifdef AI_ADDRCONFIG
#  ifdef AF_UNSPEC
        if (host != NULL && family == AF_UNSPEC)
#  endif
            hints.ai_flags |= AI_ADDRCONFIG;
# endif
 
        if (lookup_type == BIO_LOOKUP_SERVER) 
            hints.ai_flags |= AI_PASSIVE; 
 
        /* Note that |res| SHOULD be a 'struct addrinfo **' thanks to 
         * macro magic in bio_local.h
         */ 
# if defined(AI_ADDRCONFIG) && defined(AI_NUMERICHOST)
      retry:
# endif
        switch ((gai_ret = getaddrinfo(host, service, &hints, res))) { 
# ifdef EAI_SYSTEM 
        case EAI_SYSTEM: 
            SYSerr(SYS_F_GETADDRINFO, get_last_socket_error()); 
            BIOerr(BIO_F_BIO_LOOKUP_EX, ERR_R_SYS_LIB); 
            break; 
# endif 
# ifdef EAI_MEMORY
        case EAI_MEMORY:
            BIOerr(BIO_F_BIO_LOOKUP_EX, ERR_R_MALLOC_FAILURE);
            break;
# endif
        case 0: 
            ret = 1;             /* Success */ 
            break; 
        default: 
# if defined(AI_ADDRCONFIG) && defined(AI_NUMERICHOST)
            if (hints.ai_flags & AI_ADDRCONFIG) {
                hints.ai_flags &= ~AI_ADDRCONFIG;
                hints.ai_flags |= AI_NUMERICHOST;
                old_ret = gai_ret;
                goto retry;
            }
# endif
            BIOerr(BIO_F_BIO_LOOKUP_EX, ERR_R_SYS_LIB); 
            ERR_add_error_data(1, gai_strerror(old_ret ? old_ret : gai_ret));
            break; 
        } 
    } else { 
#endif 
        const struct hostent *he; 
/* 
 * Because struct hostent is defined for 32-bit pointers only with 
 * VMS C, we need to make sure that '&he_fallback_address' and 
 * '&he_fallback_addresses' are 32-bit pointers 
 */ 
#if defined(OPENSSL_SYS_VMS) && defined(__DECC) 
# pragma pointer_size save 
# pragma pointer_size 32 
#endif 
        /* Windows doesn't seem to have in_addr_t */ 
#ifdef OPENSSL_SYS_WINDOWS 
        static uint32_t he_fallback_address; 
        static const char *he_fallback_addresses[] = 
            { (char *)&he_fallback_address, NULL }; 
#else 
        static in_addr_t he_fallback_address; 
        static const char *he_fallback_addresses[] = 
            { (char *)&he_fallback_address, NULL }; 
#endif 
        static const struct hostent he_fallback = 
            { NULL, NULL, AF_INET, sizeof(he_fallback_address), 
              (char **)&he_fallback_addresses }; 
#if defined(OPENSSL_SYS_VMS) && defined(__DECC) 
# pragma pointer_size restore 
#endif 
 
        struct servent *se; 
        /* Apparently, on WIN64, s_proto and s_port have traded places... */ 
#ifdef _WIN64 
        struct servent se_fallback = { NULL, NULL, NULL, 0 }; 
#else 
        struct servent se_fallback = { NULL, NULL, 0, NULL }; 
#endif 
 
        if (!RUN_ONCE(&bio_lookup_init, do_bio_lookup_init)) { 
            BIOerr(BIO_F_BIO_LOOKUP_EX, ERR_R_MALLOC_FAILURE); 
            ret = 0; 
            goto err; 
        } 
 
        CRYPTO_THREAD_write_lock(bio_lookup_lock); 
        he_fallback_address = INADDR_ANY; 
        if (host == NULL) { 
            he = &he_fallback; 
            switch(lookup_type) { 
            case BIO_LOOKUP_CLIENT: 
                he_fallback_address = INADDR_LOOPBACK; 
                break; 
            case BIO_LOOKUP_SERVER: 
                he_fallback_address = INADDR_ANY; 
                break; 
            default: 
                /* We forgot to handle a lookup type! */ 
                assert("We forgot to handle a lookup type!" == NULL); 
                BIOerr(BIO_F_BIO_LOOKUP_EX, ERR_R_INTERNAL_ERROR); 
                ret = 0; 
                goto err; 
            } 
        } else { 
            he = gethostbyname(host); 
 
            if (he == NULL) { 
#ifndef OPENSSL_SYS_WINDOWS 
                /* 
                 * This might be misleading, because h_errno is used as if 
                 * it was errno. To minimize mixup add 1000. Underlying 
                 * reason for this is that hstrerror is declared obsolete, 
                 * not to mention that a) h_errno is not always guaranteed 
                 * to be meaningless; b) hstrerror can reside in yet another 
                 * library, linking for sake of hstrerror is an overkill; 
                 * c) this path is not executed on contemporary systems 
                 * anyway [above getaddrinfo/gai_strerror is]. We just let 
                 * system administrator figure this out... 
                 */ 
# if defined(OPENSSL_SYS_VXWORKS) 
                /* h_errno doesn't exist on VxWorks */ 
                SYSerr(SYS_F_GETHOSTBYNAME, 1000 ); 
# else 
                SYSerr(SYS_F_GETHOSTBYNAME, 1000 + h_errno); 
# endif 
#else 
                SYSerr(SYS_F_GETHOSTBYNAME, WSAGetLastError()); 
#endif 
                ret = 0; 
                goto err; 
            } 
        } 
 
        if (service == NULL) { 
            se_fallback.s_port = 0; 
            se_fallback.s_proto = NULL; 
            se = &se_fallback; 
        } else { 
            char *endp = NULL; 
            long portnum = strtol(service, &endp, 10); 
 
/* 
 * Because struct servent is defined for 32-bit pointers only with 
 * VMS C, we need to make sure that 'proto' is a 32-bit pointer. 
 */ 
#if defined(OPENSSL_SYS_VMS) && defined(__DECC) 
# pragma pointer_size save 
# pragma pointer_size 32 
#endif 
            char *proto = NULL; 
#if defined(OPENSSL_SYS_VMS) && defined(__DECC) 
# pragma pointer_size restore 
#endif 
 
            switch (socktype) { 
            case SOCK_STREAM: 
                proto = "tcp"; 
                break; 
            case SOCK_DGRAM: 
                proto = "udp"; 
                break; 
            } 
 
            if (endp != service && *endp == '\0' 
                    && portnum > 0 && portnum < 65536) { 
                se_fallback.s_port = htons((unsigned short)portnum); 
                se_fallback.s_proto = proto; 
                se = &se_fallback; 
            } else if (endp == service) { 
                se = getservbyname(service, proto); 
 
                if (se == NULL) { 
#ifndef OPENSSL_SYS_WINDOWS 
                    SYSerr(SYS_F_GETSERVBYNAME, errno); 
#else 
                    SYSerr(SYS_F_GETSERVBYNAME, WSAGetLastError()); 
#endif 
                    goto err; 
                } 
            } else { 
                BIOerr(BIO_F_BIO_LOOKUP_EX, BIO_R_MALFORMED_HOST_OR_SERVICE); 
                goto err; 
            } 
        } 
 
        *res = NULL; 
 
        { 
/* 
 * Because hostent::h_addr_list is an array of 32-bit pointers with VMS C, 
 * we must make sure our iterator designates the same element type, hence 
 * the pointer size dance. 
 */ 
#if defined(OPENSSL_SYS_VMS) && defined(__DECC) 
# pragma pointer_size save 
# pragma pointer_size 32 
#endif 
            char **addrlistp; 
#if defined(OPENSSL_SYS_VMS) && defined(__DECC) 
# pragma pointer_size restore 
#endif 
            size_t addresses; 
            BIO_ADDRINFO *tmp_bai = NULL; 
 
            /* The easiest way to create a linked list from an 
               array is to start from the back */ 
            for(addrlistp = he->h_addr_list; *addrlistp != NULL; 
                addrlistp++) 
                ; 
 
            for(addresses = addrlistp - he->h_addr_list; 
                addrlistp--, addresses-- > 0; ) { 
                if (!addrinfo_wrap(he->h_addrtype, socktype, 
                                   *addrlistp, he->h_length, 
                                   se->s_port, &tmp_bai)) 
                    goto addrinfo_malloc_err; 
                tmp_bai->bai_next = *res; 
                *res = tmp_bai; 
                continue; 
             addrinfo_malloc_err: 
                BIO_ADDRINFO_free(*res); 
                *res = NULL; 
                BIOerr(BIO_F_BIO_LOOKUP_EX, ERR_R_MALLOC_FAILURE); 
                ret = 0; 
                goto err; 
            } 
 
            ret = 1; 
        } 
     err: 
        CRYPTO_THREAD_unlock(bio_lookup_lock); 
    } 
 
    return ret; 
} 
 
#endif /* OPENSSL_NO_SOCK */