bss_dgram.c 61.2 KB
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/* crypto/bio/bio_dgram.c */
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/*
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 * DTLS implementation written by Nagendra Modadugu
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 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
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 */
/* ====================================================================
 * Copyright (c) 1999-2005 The OpenSSL 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
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 *    notice, this list of conditions and the following disclaimer.
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 *
 * 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. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED 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 OpenSSL PROJECT OR
 * ITS 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 product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include <stdio.h>
#include <errno.h>
#define USE_SOCKETS
#include "cryptlib.h"

#include <openssl/bio.h>
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#ifndef OPENSSL_NO_DGRAM
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# if !(defined(_WIN32) || defined(OPENSSL_SYS_VMS))
#  include <sys/time.h>
# endif
# if defined(OPENSSL_SYS_VMS)
#  include <sys/timeb.h>
# endif
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# ifndef OPENSSL_NO_SCTP
#  include <netinet/sctp.h>
#  include <fcntl.h>
#  define OPENSSL_SCTP_DATA_CHUNK_TYPE            0x00
#  define OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE 0xc0
# endif
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# if defined(OPENSSL_SYS_LINUX) && !defined(IP_MTU)
#  define IP_MTU      14        /* linux is lame */
# endif
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# if OPENSSL_USE_IPV6 && !defined(IPPROTO_IPV6)
#  define IPPROTO_IPV6 41       /* windows is lame */
# endif
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# if defined(__FreeBSD__) && defined(IN6_IS_ADDR_V4MAPPED)
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/* Standard definition causes type-punning problems. */
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#  undef IN6_IS_ADDR_V4MAPPED
#  define s6_addr32 __u6_addr.__u6_addr32
#  define IN6_IS_ADDR_V4MAPPED(a)               \
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        (((a)->s6_addr32[0] == 0) &&          \
         ((a)->s6_addr32[1] == 0) &&          \
         ((a)->s6_addr32[2] == htonl(0x0000ffff)))
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# endif
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# ifdef WATT32
#  define sock_write SockWrite  /* Watt-32 uses same names */
#  define sock_read  SockRead
#  define sock_puts  SockPuts
# endif
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static int dgram_write(BIO *h, const char *buf, int num);
static int dgram_read(BIO *h, char *buf, int size);
static int dgram_puts(BIO *h, const char *str);
static long dgram_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int dgram_new(BIO *h);
static int dgram_free(BIO *data);
static int dgram_clear(BIO *bio);

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# ifndef OPENSSL_NO_SCTP
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static int dgram_sctp_write(BIO *h, const char *buf, int num);
static int dgram_sctp_read(BIO *h, char *buf, int size);
static int dgram_sctp_puts(BIO *h, const char *str);
static long dgram_sctp_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int dgram_sctp_new(BIO *h);
static int dgram_sctp_free(BIO *data);
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#  ifdef SCTP_AUTHENTICATION_EVENT
static void dgram_sctp_handle_auth_free_key_event(BIO *b, union sctp_notification
                                                  *snp);
#  endif
# endif
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static int BIO_dgram_should_retry(int s);
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static void get_current_time(struct timeval *t);

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static BIO_METHOD methods_dgramp = {
    BIO_TYPE_DGRAM,
    "datagram socket",
    dgram_write,
    dgram_read,
    dgram_puts,
    NULL,                       /* dgram_gets, */
    dgram_ctrl,
    dgram_new,
    dgram_free,
    NULL,
};

# ifndef OPENSSL_NO_SCTP
static BIO_METHOD methods_dgramp_sctp = {
    BIO_TYPE_DGRAM_SCTP,
    "datagram sctp socket",
    dgram_sctp_write,
    dgram_sctp_read,
    dgram_sctp_puts,
    NULL,                       /* dgram_gets, */
    dgram_sctp_ctrl,
    dgram_sctp_new,
    dgram_sctp_free,
    NULL,
};
# endif
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typedef struct bio_dgram_data_st {
    union {
        struct sockaddr sa;
        struct sockaddr_in sa_in;
# if OPENSSL_USE_IPV6
        struct sockaddr_in6 sa_in6;
# endif
    } peer;
    unsigned int connected;
    unsigned int _errno;
    unsigned int mtu;
    struct timeval next_timeout;
    struct timeval socket_timeout;
} bio_dgram_data;

# ifndef OPENSSL_NO_SCTP
typedef struct bio_dgram_sctp_save_message_st {
    BIO *bio;
    char *data;
    int length;
} bio_dgram_sctp_save_message;

typedef struct bio_dgram_sctp_data_st {
    union {
        struct sockaddr sa;
        struct sockaddr_in sa_in;
#  if OPENSSL_USE_IPV6
        struct sockaddr_in6 sa_in6;
#  endif
    } peer;
    unsigned int connected;
    unsigned int _errno;
    unsigned int mtu;
    struct bio_dgram_sctp_sndinfo sndinfo;
    struct bio_dgram_sctp_rcvinfo rcvinfo;
    struct bio_dgram_sctp_prinfo prinfo;
    void (*handle_notifications) (BIO *bio, void *context, void *buf);
    void *notification_context;
    int in_handshake;
    int ccs_rcvd;
    int ccs_sent;
    int save_shutdown;
    int peer_auth_tested;
    bio_dgram_sctp_save_message saved_message;
} bio_dgram_sctp_data;
# endif
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BIO_METHOD *BIO_s_datagram(void)
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{
    return (&methods_dgramp);
}
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BIO *BIO_new_dgram(int fd, int close_flag)
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{
    BIO *ret;
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    ret = BIO_new(BIO_s_datagram());
    if (ret == NULL)
        return (NULL);
    BIO_set_fd(ret, fd, close_flag);
    return (ret);
}
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static int dgram_new(BIO *bi)
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{
    bio_dgram_data *data = NULL;

    bi->init = 0;
    bi->num = 0;
    data = OPENSSL_malloc(sizeof(bio_dgram_data));
    if (data == NULL)
        return 0;
    memset(data, 0x00, sizeof(bio_dgram_data));
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    bi->ptr = data;

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    bi->flags = 0;
    return (1);
}
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static int dgram_free(BIO *a)
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{
    bio_dgram_data *data;
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    if (a == NULL)
        return (0);
    if (!dgram_clear(a))
        return 0;
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    data = (bio_dgram_data *)a->ptr;
    if (data != NULL)
        OPENSSL_free(data);
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    return (1);
}
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static int dgram_clear(BIO *a)
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{
    if (a == NULL)
        return (0);
    if (a->shutdown) {
        if (a->init) {
            SHUTDOWN2(a->num);
        }
        a->init = 0;
        a->flags = 0;
    }
    return (1);
}
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static void dgram_adjust_rcv_timeout(BIO *b)
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{
# if defined(SO_RCVTIMEO)
    bio_dgram_data *data = (bio_dgram_data *)b->ptr;
    union {
        size_t s;
        int i;
    } sz = {
        0
    };

    /* Is a timer active? */
    if (data->next_timeout.tv_sec > 0 || data->next_timeout.tv_usec > 0) {
        struct timeval timenow, timeleft;

        /* Read current socket timeout */
#  ifdef OPENSSL_SYS_WINDOWS
        int timeout;

        sz.i = sizeof(timeout);
        if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
                       (void *)&timeout, &sz.i) < 0) {
            perror("getsockopt");
        } else {
            data->socket_timeout.tv_sec = timeout / 1000;
            data->socket_timeout.tv_usec = (timeout % 1000) * 1000;
        }
#  else
        sz.i = sizeof(data->socket_timeout);
        if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
                       &(data->socket_timeout), (void *)&sz) < 0) {
            perror("getsockopt");
        } else if (sizeof(sz.s) != sizeof(sz.i) && sz.i == 0)
            OPENSSL_assert(sz.s <= sizeof(data->socket_timeout));
#  endif
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        /* Get current time */
        get_current_time(&timenow);

        /* Calculate time left until timer expires */
        memcpy(&timeleft, &(data->next_timeout), sizeof(struct timeval));
        timeleft.tv_sec -= timenow.tv_sec;
        timeleft.tv_usec -= timenow.tv_usec;
        if (timeleft.tv_usec < 0) {
            timeleft.tv_sec--;
            timeleft.tv_usec += 1000000;
        }

        if (timeleft.tv_sec < 0) {
            timeleft.tv_sec = 0;
            timeleft.tv_usec = 1;
        }

        /*
         * Adjust socket timeout if next handhake message timer will expire
         * earlier.
         */
        if ((data->socket_timeout.tv_sec == 0
             && data->socket_timeout.tv_usec == 0)
            || (data->socket_timeout.tv_sec > timeleft.tv_sec)
            || (data->socket_timeout.tv_sec == timeleft.tv_sec
                && data->socket_timeout.tv_usec >= timeleft.tv_usec)) {
#  ifdef OPENSSL_SYS_WINDOWS
            timeout = timeleft.tv_sec * 1000 + timeleft.tv_usec / 1000;
            if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
                           (void *)&timeout, sizeof(timeout)) < 0) {
                perror("setsockopt");
            }
#  else
            if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, &timeleft,
                           sizeof(struct timeval)) < 0) {
                perror("setsockopt");
            }
#  endif
        }
    }
# endif
}
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static void dgram_reset_rcv_timeout(BIO *b)
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{
# if defined(SO_RCVTIMEO)
    bio_dgram_data *data = (bio_dgram_data *)b->ptr;

    /* Is a timer active? */
    if (data->next_timeout.tv_sec > 0 || data->next_timeout.tv_usec > 0) {
#  ifdef OPENSSL_SYS_WINDOWS
        int timeout = data->socket_timeout.tv_sec * 1000 +
            data->socket_timeout.tv_usec / 1000;
        if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
                       (void *)&timeout, sizeof(timeout)) < 0) {
            perror("setsockopt");
        }
#  else
        if (setsockopt
            (b->num, SOL_SOCKET, SO_RCVTIMEO, &(data->socket_timeout),
             sizeof(struct timeval)) < 0) {
            perror("setsockopt");
        }
#  endif
    }
# endif
}
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static int dgram_read(BIO *b, char *out, int outl)
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{
    int ret = 0;
    bio_dgram_data *data = (bio_dgram_data *)b->ptr;

    struct {
        /*
         * See commentary in b_sock.c. <appro>
         */
        union {
            size_t s;
            int i;
        } len;
        union {
            struct sockaddr sa;
            struct sockaddr_in sa_in;
# if OPENSSL_USE_IPV6
            struct sockaddr_in6 sa_in6;
# endif
        } peer;
    } sa;

    sa.len.s = 0;
    sa.len.i = sizeof(sa.peer);

    if (out != NULL) {
        clear_socket_error();
        memset(&sa.peer, 0x00, sizeof(sa.peer));
        dgram_adjust_rcv_timeout(b);
        ret = recvfrom(b->num, out, outl, 0, &sa.peer.sa, (void *)&sa.len);
        if (sizeof(sa.len.i) != sizeof(sa.len.s) && sa.len.i == 0) {
            OPENSSL_assert(sa.len.s <= sizeof(sa.peer));
            sa.len.i = (int)sa.len.s;
        }

        if (!data->connected && ret >= 0)
            BIO_ctrl(b, BIO_CTRL_DGRAM_SET_PEER, 0, &sa.peer);

        BIO_clear_retry_flags(b);
        if (ret < 0) {
            if (BIO_dgram_should_retry(ret)) {
                BIO_set_retry_read(b);
                data->_errno = get_last_socket_error();
            }
        }

        dgram_reset_rcv_timeout(b);
    }
    return (ret);
}
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static int dgram_write(BIO *b, const char *in, int inl)
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{
    int ret;
    bio_dgram_data *data = (bio_dgram_data *)b->ptr;
    clear_socket_error();

    if (data->connected)
        ret = writesocket(b->num, in, inl);
    else {
        int peerlen = sizeof(data->peer);

        if (data->peer.sa.sa_family == AF_INET)
            peerlen = sizeof(data->peer.sa_in);
# if OPENSSL_USE_IPV6
        else if (data->peer.sa.sa_family == AF_INET6)
            peerlen = sizeof(data->peer.sa_in6);
# endif
# if defined(NETWARE_CLIB) && defined(NETWARE_BSDSOCK)
        ret = sendto(b->num, (char *)in, inl, 0, &data->peer.sa, peerlen);
# else
        ret = sendto(b->num, in, inl, 0, &data->peer.sa, peerlen);
# endif
    }

    BIO_clear_retry_flags(b);
    if (ret <= 0) {
        if (BIO_dgram_should_retry(ret)) {
            BIO_set_retry_write(b);
            data->_errno = get_last_socket_error();

# if 0                          /* higher layers are responsible for querying
                                 * MTU, if necessary */
            if (data->_errno == EMSGSIZE)
                /* retrieve the new MTU */
                BIO_ctrl(b, BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
# endif
        }
    }
    return (ret);
}
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static long dgram_get_mtu_overhead(bio_dgram_data *data)
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{
    long ret;

    switch (data->peer.sa.sa_family) {
    case AF_INET:
        /*
         * Assume this is UDP - 20 bytes for IP, 8 bytes for UDP
         */
        ret = 28;
        break;
# if OPENSSL_USE_IPV6
    case AF_INET6:
#  ifdef IN6_IS_ADDR_V4MAPPED
        if (IN6_IS_ADDR_V4MAPPED(&data->peer.sa_in6.sin6_addr))
            /*
             * Assume this is UDP - 20 bytes for IP, 8 bytes for UDP
             */
            ret = 28;
        else
#  endif
            /*
             * Assume this is UDP - 40 bytes for IP, 8 bytes for UDP
             */
            ret = 48;
        break;
# endif
    default:
        /* We don't know. Go with the historical default */
        ret = 28;
        break;
    }
    return ret;
}
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static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr)
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{
    long ret = 1;
    int *ip;
    struct sockaddr *to = NULL;
    bio_dgram_data *data = NULL;
    int sockopt_val = 0;
# if defined(OPENSSL_SYS_LINUX) && (defined(IP_MTU_DISCOVER) || defined(IP_MTU))
    socklen_t sockopt_len;      /* assume that system supporting IP_MTU is
                                 * modern enough to define socklen_t */
    socklen_t addr_len;
    union {
        struct sockaddr sa;
        struct sockaddr_in s4;
#  if OPENSSL_USE_IPV6
        struct sockaddr_in6 s6;
#  endif
    } addr;
# endif
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    data = (bio_dgram_data *)b->ptr;

    switch (cmd) {
    case BIO_CTRL_RESET:
        num = 0;
    case BIO_C_FILE_SEEK:
        ret = 0;
        break;
    case BIO_C_FILE_TELL:
    case BIO_CTRL_INFO:
        ret = 0;
        break;
    case BIO_C_SET_FD:
        dgram_clear(b);
        b->num = *((int *)ptr);
        b->shutdown = (int)num;
        b->init = 1;
        break;
    case BIO_C_GET_FD:
        if (b->init) {
            ip = (int *)ptr;
            if (ip != NULL)
                *ip = b->num;
            ret = b->num;
        } else
            ret = -1;
        break;
    case BIO_CTRL_GET_CLOSE:
        ret = b->shutdown;
        break;
    case BIO_CTRL_SET_CLOSE:
        b->shutdown = (int)num;
        break;
    case BIO_CTRL_PENDING:
    case BIO_CTRL_WPENDING:
        ret = 0;
        break;
    case BIO_CTRL_DUP:
    case BIO_CTRL_FLUSH:
        ret = 1;
        break;
    case BIO_CTRL_DGRAM_CONNECT:
        to = (struct sockaddr *)ptr;
# if 0
        if (connect(b->num, to, sizeof(struct sockaddr)) < 0) {
            perror("connect");
            ret = 0;
        } else {
# endif
            switch (to->sa_family) {
            case AF_INET:
                memcpy(&data->peer, to, sizeof(data->peer.sa_in));
                break;
# if OPENSSL_USE_IPV6
            case AF_INET6:
                memcpy(&data->peer, to, sizeof(data->peer.sa_in6));
                break;
# endif
            default:
                memcpy(&data->peer, to, sizeof(data->peer.sa));
                break;
            }
# if 0
        }
# endif
        break;
        /* (Linux)kernel sets DF bit on outgoing IP packets */
    case BIO_CTRL_DGRAM_MTU_DISCOVER:
# if defined(OPENSSL_SYS_LINUX) && defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO)
        addr_len = (socklen_t) sizeof(addr);
        memset((void *)&addr, 0, sizeof(addr));
        if (getsockname(b->num, &addr.sa, &addr_len) < 0) {
            ret = 0;
            break;
        }
        switch (addr.sa.sa_family) {
        case AF_INET:
            sockopt_val = IP_PMTUDISC_DO;
            if ((ret = setsockopt(b->num, IPPROTO_IP, IP_MTU_DISCOVER,
                                  &sockopt_val, sizeof(sockopt_val))) < 0)
                perror("setsockopt");
            break;
#  if OPENSSL_USE_IPV6 && defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO)
        case AF_INET6:
            sockopt_val = IPV6_PMTUDISC_DO;
            if ((ret = setsockopt(b->num, IPPROTO_IPV6, IPV6_MTU_DISCOVER,
                                  &sockopt_val, sizeof(sockopt_val))) < 0)
                perror("setsockopt");
            break;
#  endif
        default:
            ret = -1;
            break;
        }
# else
        ret = -1;
# endif
        break;
    case BIO_CTRL_DGRAM_QUERY_MTU:
# if defined(OPENSSL_SYS_LINUX) && defined(IP_MTU)
        addr_len = (socklen_t) sizeof(addr);
        memset((void *)&addr, 0, sizeof(addr));
        if (getsockname(b->num, &addr.sa, &addr_len) < 0) {
            ret = 0;
            break;
        }
        sockopt_len = sizeof(sockopt_val);
        switch (addr.sa.sa_family) {
        case AF_INET:
            if ((ret =
                 getsockopt(b->num, IPPROTO_IP, IP_MTU, (void *)&sockopt_val,
                            &sockopt_len)) < 0 || sockopt_val < 0) {
                ret = 0;
            } else {
                /*
                 * we assume that the transport protocol is UDP and no IP
                 * options are used.
                 */
                data->mtu = sockopt_val - 8 - 20;
                ret = data->mtu;
            }
            break;
#  if OPENSSL_USE_IPV6 && defined(IPV6_MTU)
        case AF_INET6:
            if ((ret =
                 getsockopt(b->num, IPPROTO_IPV6, IPV6_MTU,
                            (void *)&sockopt_val, &sockopt_len)) < 0
                || sockopt_val < 0) {
                ret = 0;
            } else {
                /*
                 * we assume that the transport protocol is UDP and no IPV6
                 * options are used.
                 */
                data->mtu = sockopt_val - 8 - 40;
                ret = data->mtu;
            }
            break;
#  endif
        default:
            ret = 0;
            break;
        }
# else
        ret = 0;
# endif
        break;
    case BIO_CTRL_DGRAM_GET_FALLBACK_MTU:
        ret = -dgram_get_mtu_overhead(data);
        switch (data->peer.sa.sa_family) {
        case AF_INET:
            ret += 576;
            break;
# if OPENSSL_USE_IPV6
        case AF_INET6:
#  ifdef IN6_IS_ADDR_V4MAPPED
            if (IN6_IS_ADDR_V4MAPPED(&data->peer.sa_in6.sin6_addr))
                ret += 576;
            else
#  endif
                ret += 1280;
            break;
# endif
        default:
            ret += 576;
            break;
        }
        break;
    case BIO_CTRL_DGRAM_GET_MTU:
        return data->mtu;
        break;
    case BIO_CTRL_DGRAM_SET_MTU:
        data->mtu = num;
        ret = num;
        break;
    case BIO_CTRL_DGRAM_SET_CONNECTED:
        to = (struct sockaddr *)ptr;

        if (to != NULL) {
            data->connected = 1;
            switch (to->sa_family) {
            case AF_INET:
                memcpy(&data->peer, to, sizeof(data->peer.sa_in));
                break;
# if OPENSSL_USE_IPV6
            case AF_INET6:
                memcpy(&data->peer, to, sizeof(data->peer.sa_in6));
                break;
# endif
            default:
                memcpy(&data->peer, to, sizeof(data->peer.sa));
                break;
            }
        } else {
            data->connected = 0;
            memset(&(data->peer), 0x00, sizeof(data->peer));
        }
        break;
    case BIO_CTRL_DGRAM_GET_PEER:
        switch (data->peer.sa.sa_family) {
        case AF_INET:
            ret = sizeof(data->peer.sa_in);
            break;
# if OPENSSL_USE_IPV6
        case AF_INET6:
            ret = sizeof(data->peer.sa_in6);
            break;
# endif
        default:
            ret = sizeof(data->peer.sa);
            break;
        }
        if (num == 0 || num > ret)
            num = ret;
        memcpy(ptr, &data->peer, (ret = num));
        break;
    case BIO_CTRL_DGRAM_SET_PEER:
        to = (struct sockaddr *)ptr;
        switch (to->sa_family) {
        case AF_INET:
            memcpy(&data->peer, to, sizeof(data->peer.sa_in));
            break;
# if OPENSSL_USE_IPV6
        case AF_INET6:
            memcpy(&data->peer, to, sizeof(data->peer.sa_in6));
            break;
# endif
        default:
            memcpy(&data->peer, to, sizeof(data->peer.sa));
            break;
        }
        break;
    case BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT:
        memcpy(&(data->next_timeout), ptr, sizeof(struct timeval));
        break;
# if defined(SO_RCVTIMEO)
    case BIO_CTRL_DGRAM_SET_RECV_TIMEOUT:
#  ifdef OPENSSL_SYS_WINDOWS
        {
            struct timeval *tv = (struct timeval *)ptr;
            int timeout = tv->tv_sec * 1000 + tv->tv_usec / 1000;
            if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
                           (void *)&timeout, sizeof(timeout)) < 0) {
                perror("setsockopt");
                ret = -1;
            }
        }
#  else
        if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, ptr,
                       sizeof(struct timeval)) < 0) {
            perror("setsockopt");
            ret = -1;
        }
#  endif
        break;
    case BIO_CTRL_DGRAM_GET_RECV_TIMEOUT:
        {
            union {
                size_t s;
                int i;
            } sz = {
                0
            };
#  ifdef OPENSSL_SYS_WINDOWS
            int timeout;
            struct timeval *tv = (struct timeval *)ptr;

            sz.i = sizeof(timeout);
            if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
                           (void *)&timeout, &sz.i) < 0) {
                perror("getsockopt");
                ret = -1;
            } else {
                tv->tv_sec = timeout / 1000;
                tv->tv_usec = (timeout % 1000) * 1000;
                ret = sizeof(*tv);
            }
#  else
            sz.i = sizeof(struct timeval);
            if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
                           ptr, (void *)&sz) < 0) {
                perror("getsockopt");
                ret = -1;
            } else if (sizeof(sz.s) != sizeof(sz.i) && sz.i == 0) {
                OPENSSL_assert(sz.s <= sizeof(struct timeval));
                ret = (int)sz.s;
            } else
                ret = sz.i;
#  endif
        }
        break;
# endif
# if defined(SO_SNDTIMEO)
    case BIO_CTRL_DGRAM_SET_SEND_TIMEOUT:
#  ifdef OPENSSL_SYS_WINDOWS
        {
            struct timeval *tv = (struct timeval *)ptr;
            int timeout = tv->tv_sec * 1000 + tv->tv_usec / 1000;
            if (setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
                           (void *)&timeout, sizeof(timeout)) < 0) {
                perror("setsockopt");
                ret = -1;
            }
        }
#  else
        if (setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO, ptr,
                       sizeof(struct timeval)) < 0) {
            perror("setsockopt");
            ret = -1;
        }
#  endif
        break;
    case BIO_CTRL_DGRAM_GET_SEND_TIMEOUT:
        {
            union {
                size_t s;
                int i;
            } sz = {
                0
            };
#  ifdef OPENSSL_SYS_WINDOWS
            int timeout;
            struct timeval *tv = (struct timeval *)ptr;

            sz.i = sizeof(timeout);
            if (getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
                           (void *)&timeout, &sz.i) < 0) {
                perror("getsockopt");
                ret = -1;
            } else {
                tv->tv_sec = timeout / 1000;
                tv->tv_usec = (timeout % 1000) * 1000;
                ret = sizeof(*tv);
            }
#  else
            sz.i = sizeof(struct timeval);
            if (getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
                           ptr, (void *)&sz) < 0) {
                perror("getsockopt");
                ret = -1;
            } else if (sizeof(sz.s) != sizeof(sz.i) && sz.i == 0) {
                OPENSSL_assert(sz.s <= sizeof(struct timeval));
                ret = (int)sz.s;
            } else
                ret = sz.i;
#  endif
        }
        break;
# endif
    case BIO_CTRL_DGRAM_GET_SEND_TIMER_EXP:
        /* fall-through */
    case BIO_CTRL_DGRAM_GET_RECV_TIMER_EXP:
# ifdef OPENSSL_SYS_WINDOWS
        if (data->_errno == WSAETIMEDOUT)
# else
        if (data->_errno == EAGAIN)
# endif
        {
            ret = 1;
            data->_errno = 0;
        } else
            ret = 0;
        break;
# ifdef EMSGSIZE
    case BIO_CTRL_DGRAM_MTU_EXCEEDED:
        if (data->_errno == EMSGSIZE) {
            ret = 1;
            data->_errno = 0;
        } else
            ret = 0;
        break;
# endif
    case BIO_CTRL_DGRAM_SET_DONT_FRAG:
        sockopt_val = num ? 1 : 0;

        switch (data->peer.sa.sa_family) {
        case AF_INET:
# if defined(IP_DONTFRAG)
            if ((ret = setsockopt(b->num, IPPROTO_IP, IP_DONTFRAG,
                                  &sockopt_val, sizeof(sockopt_val))) < 0) {
                perror("setsockopt");
                ret = -1;
            }
# elif defined(OPENSSL_SYS_LINUX) && defined(IP_MTUDISCOVER)
            if ((sockopt_val = num ? IP_PMTUDISC_PROBE : IP_PMTUDISC_DONT),
                (ret = setsockopt(b->num, IPPROTO_IP, IP_MTU_DISCOVER,
                                  &sockopt_val, sizeof(sockopt_val))) < 0) {
                perror("setsockopt");
                ret = -1;
            }
# elif defined(OPENSSL_SYS_WINDOWS) && defined(IP_DONTFRAGMENT)
            if ((ret = setsockopt(b->num, IPPROTO_IP, IP_DONTFRAGMENT,
                                  (const char *)&sockopt_val,
                                  sizeof(sockopt_val))) < 0) {
                perror("setsockopt");
                ret = -1;
            }
# else
            ret = -1;
# endif
            break;
# if OPENSSL_USE_IPV6
        case AF_INET6:
#  if defined(IPV6_DONTFRAG)
            if ((ret = setsockopt(b->num, IPPROTO_IPV6, IPV6_DONTFRAG,
                                  (const void *)&sockopt_val,
                                  sizeof(sockopt_val))) < 0) {
                perror("setsockopt");
                ret = -1;
            }
#  elif defined(OPENSSL_SYS_LINUX) && defined(IPV6_MTUDISCOVER)
            if ((sockopt_val = num ? IP_PMTUDISC_PROBE : IP_PMTUDISC_DONT),
                (ret = setsockopt(b->num, IPPROTO_IPV6, IPV6_MTU_DISCOVER,
                                  &sockopt_val, sizeof(sockopt_val))) < 0) {
                perror("setsockopt");
                ret = -1;
            }
#  else
            ret = -1;
#  endif
            break;
# endif
        default:
            ret = -1;
            break;
        }
        break;
    case BIO_CTRL_DGRAM_GET_MTU_OVERHEAD:
        ret = dgram_get_mtu_overhead(data);
        break;
    default:
        ret = 0;
        break;
    }
    return (ret);
}
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static int dgram_puts(BIO *bp, const char *str)
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{
    int n, ret;
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    n = strlen(str);
    ret = dgram_write(bp, str, n);
    return (ret);
}
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# ifndef OPENSSL_NO_SCTP
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BIO_METHOD *BIO_s_datagram_sctp(void)
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{
    return (&methods_dgramp_sctp);
}
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BIO *BIO_new_dgram_sctp(int fd, int close_flag)
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{
    BIO *bio;
    int ret, optval = 20000;
    int auth_data = 0, auth_forward = 0;
    unsigned char *p;
    struct sctp_authchunk auth;
    struct sctp_authchunks *authchunks;
    socklen_t sockopt_len;
#  ifdef SCTP_AUTHENTICATION_EVENT
#   ifdef SCTP_EVENT
    struct sctp_event event;
#   else
    struct sctp_event_subscribe event;
#   endif
#  endif
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    bio = BIO_new(BIO_s_datagram_sctp());
    if (bio == NULL)
        return (NULL);
    BIO_set_fd(bio, fd, close_flag);

    /* Activate SCTP-AUTH for DATA and FORWARD-TSN chunks */
    auth.sauth_chunk = OPENSSL_SCTP_DATA_CHUNK_TYPE;
    ret =
        setsockopt(fd, IPPROTO_SCTP, SCTP_AUTH_CHUNK, &auth,
                   sizeof(struct sctp_authchunk));
    if (ret < 0) {
        BIO_vfree(bio);
        return (NULL);
    }
    auth.sauth_chunk = OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE;
    ret =
        setsockopt(fd, IPPROTO_SCTP, SCTP_AUTH_CHUNK, &auth,
                   sizeof(struct sctp_authchunk));
    if (ret < 0) {
        BIO_vfree(bio);
        return (NULL);
    }

    /*
     * Test if activation was successful. When using accept(), SCTP-AUTH has
     * to be activated for the listening socket already, otherwise the
     * connected socket won't use it.
     */
    sockopt_len = (socklen_t) (sizeof(sctp_assoc_t) + 256 * sizeof(uint8_t));
    authchunks = OPENSSL_malloc(sockopt_len);
    memset(authchunks, 0, sockopt_len);
    ret =
        getsockopt(fd, IPPROTO_SCTP, SCTP_LOCAL_AUTH_CHUNKS, authchunks,
                   &sockopt_len);

    if (ret < 0) {
        OPENSSL_free(authchunks);
        BIO_vfree(bio);
        return (NULL);
    }

    for (p = (unsigned char *)authchunks->gauth_chunks;
         p < (unsigned char *)authchunks + sockopt_len;
         p += sizeof(uint8_t)) {
        if (*p == OPENSSL_SCTP_DATA_CHUNK_TYPE)
            auth_data = 1;
        if (*p == OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE)
            auth_forward = 1;
    }

    OPENSSL_free(authchunks);

    OPENSSL_assert(auth_data);
    OPENSSL_assert(auth_forward);

#  ifdef SCTP_AUTHENTICATION_EVENT
#   ifdef SCTP_EVENT
    memset(&event, 0, sizeof(struct sctp_event));
    event.se_assoc_id = 0;
    event.se_type = SCTP_AUTHENTICATION_EVENT;
    event.se_on = 1;
    ret =
        setsockopt(fd, IPPROTO_SCTP, SCTP_EVENT, &event,
                   sizeof(struct sctp_event));
    if (ret < 0) {
        BIO_vfree(bio);
        return (NULL);
    }
#   else
    sockopt_len = (socklen_t) sizeof(struct sctp_event_subscribe);
    ret = getsockopt(fd, IPPROTO_SCTP, SCTP_EVENTS, &event, &sockopt_len);
    if (ret < 0) {
        BIO_vfree(bio);
        return (NULL);
    }

    event.sctp_authentication_event = 1;

    ret =
        setsockopt(fd, IPPROTO_SCTP, SCTP_EVENTS, &event,
                   sizeof(struct sctp_event_subscribe));
    if (ret < 0) {
        BIO_vfree(bio);
        return (NULL);
    }
#   endif
#  endif
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    /*
     * Disable partial delivery by setting the min size larger than the max
     * record size of 2^14 + 2048 + 13
     */
    ret =
        setsockopt(fd, IPPROTO_SCTP, SCTP_PARTIAL_DELIVERY_POINT, &optval,
                   sizeof(optval));
    if (ret < 0) {
        BIO_vfree(bio);
        return (NULL);
    }

    return (bio);
}
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int BIO_dgram_is_sctp(BIO *bio)
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{
    return (BIO_method_type(bio) == BIO_TYPE_DGRAM_SCTP);
}
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static int dgram_sctp_new(BIO *bi)
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{
    bio_dgram_sctp_data *data = NULL;

    bi->init = 0;
    bi->num = 0;
    data = OPENSSL_malloc(sizeof(bio_dgram_sctp_data));
    if (data == NULL)
        return 0;
    memset(data, 0x00, sizeof(bio_dgram_sctp_data));
#  ifdef SCTP_PR_SCTP_NONE
    data->prinfo.pr_policy = SCTP_PR_SCTP_NONE;
#  endif
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    bi->ptr = data;

1111 1112 1113
    bi->flags = 0;
    return (1);
}
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static int dgram_sctp_free(BIO *a)
1116 1117
{
    bio_dgram_sctp_data *data;
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    if (a == NULL)
        return (0);
    if (!dgram_clear(a))
        return 0;
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    data = (bio_dgram_sctp_data *) a->ptr;
    if (data != NULL) {
        if (data->saved_message.data != NULL)
            OPENSSL_free(data->saved_message.data);
        OPENSSL_free(data);
    }

    return (1);
}
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#  ifdef SCTP_AUTHENTICATION_EVENT
void dgram_sctp_handle_auth_free_key_event(BIO *b,
                                           union sctp_notification *snp)
{
    int ret;
    struct sctp_authkey_event *authkeyevent = &snp->sn_auth_event;

    if (authkeyevent->auth_indication == SCTP_AUTH_FREE_KEY) {
        struct sctp_authkeyid authkeyid;

        /* delete key */
        authkeyid.scact_keynumber = authkeyevent->auth_keynumber;
        ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_DELETE_KEY,
                         &authkeyid, sizeof(struct sctp_authkeyid));
    }
}
#  endif

static int dgram_sctp_read(BIO *b, char *out, int outl)
{
    int ret = 0, n = 0, i, optval;
    socklen_t optlen;
    bio_dgram_sctp_data *data = (bio_dgram_sctp_data *) b->ptr;
    union sctp_notification *snp;
    struct msghdr msg;
    struct iovec iov;
    struct cmsghdr *cmsg;
    char cmsgbuf[512];

    if (out != NULL) {
        clear_socket_error();

        do {
            memset(&data->rcvinfo, 0x00,
                   sizeof(struct bio_dgram_sctp_rcvinfo));
            iov.iov_base = out;
            iov.iov_len = outl;
            msg.msg_name = NULL;
            msg.msg_namelen = 0;
            msg.msg_iov = &iov;
            msg.msg_iovlen = 1;
            msg.msg_control = cmsgbuf;
            msg.msg_controllen = 512;
            msg.msg_flags = 0;
            n = recvmsg(b->num, &msg, 0);

            if (n <= 0) {
                if (n < 0)
                    ret = n;
                break;
            }

            if (msg.msg_controllen > 0) {
                for (cmsg = CMSG_FIRSTHDR(&msg); cmsg;
                     cmsg = CMSG_NXTHDR(&msg, cmsg)) {
                    if (cmsg->cmsg_level != IPPROTO_SCTP)
                        continue;
#  ifdef SCTP_RCVINFO
                    if (cmsg->cmsg_type == SCTP_RCVINFO) {
                        struct sctp_rcvinfo *rcvinfo;

                        rcvinfo = (struct sctp_rcvinfo *)CMSG_DATA(cmsg);
                        data->rcvinfo.rcv_sid = rcvinfo->rcv_sid;
                        data->rcvinfo.rcv_ssn = rcvinfo->rcv_ssn;
                        data->rcvinfo.rcv_flags = rcvinfo->rcv_flags;
                        data->rcvinfo.rcv_ppid = rcvinfo->rcv_ppid;
                        data->rcvinfo.rcv_tsn = rcvinfo->rcv_tsn;
                        data->rcvinfo.rcv_cumtsn = rcvinfo->rcv_cumtsn;
                        data->rcvinfo.rcv_context = rcvinfo->rcv_context;
                    }
#  endif
#  ifdef SCTP_SNDRCV
                    if (cmsg->cmsg_type == SCTP_SNDRCV) {
                        struct sctp_sndrcvinfo *sndrcvinfo;

                        sndrcvinfo =
                            (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
                        data->rcvinfo.rcv_sid = sndrcvinfo->sinfo_stream;
                        data->rcvinfo.rcv_ssn = sndrcvinfo->sinfo_ssn;
                        data->rcvinfo.rcv_flags = sndrcvinfo->sinfo_flags;
                        data->rcvinfo.rcv_ppid = sndrcvinfo->sinfo_ppid;
                        data->rcvinfo.rcv_tsn = sndrcvinfo->sinfo_tsn;
                        data->rcvinfo.rcv_cumtsn = sndrcvinfo->sinfo_cumtsn;
                        data->rcvinfo.rcv_context = sndrcvinfo->sinfo_context;
                    }
#  endif
                }
            }

            if (msg.msg_flags & MSG_NOTIFICATION) {
                snp = (union sctp_notification *)out;
                if (snp->sn_header.sn_type == SCTP_SENDER_DRY_EVENT) {
#  ifdef SCTP_EVENT
                    struct sctp_event event;
#  else
                    struct sctp_event_subscribe event;
                    socklen_t eventsize;
#  endif
                    /*
                     * If a message has been delayed until the socket is dry,
                     * it can be sent now.
                     */
                    if (data->saved_message.length > 0) {
                        dgram_sctp_write(data->saved_message.bio,
                                         data->saved_message.data,
                                         data->saved_message.length);
                        OPENSSL_free(data->saved_message.data);
                        data->saved_message.data = NULL;
                        data->saved_message.length = 0;
                    }

                    /* disable sender dry event */
#  ifdef SCTP_EVENT
                    memset(&event, 0, sizeof(struct sctp_event));
                    event.se_assoc_id = 0;
                    event.se_type = SCTP_SENDER_DRY_EVENT;
                    event.se_on = 0;
                    i = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENT, &event,
                                   sizeof(struct sctp_event));
                    if (i < 0) {
                        ret = i;
                        break;
                    }
#  else
                    eventsize = sizeof(struct sctp_event_subscribe);
                    i = getsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event,
                                   &eventsize);
                    if (i < 0) {
                        ret = i;
                        break;
                    }

                    event.sctp_sender_dry_event = 0;

                    i = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event,
                                   sizeof(struct sctp_event_subscribe));
                    if (i < 0) {
                        ret = i;
                        break;
                    }
#  endif
                }
#  ifdef SCTP_AUTHENTICATION_EVENT
                if (snp->sn_header.sn_type == SCTP_AUTHENTICATION_EVENT)
                    dgram_sctp_handle_auth_free_key_event(b, snp);
#  endif

                if (data->handle_notifications != NULL)
                    data->handle_notifications(b, data->notification_context,
                                               (void *)out);

                memset(out, 0, outl);
            } else
                ret += n;
        }
        while ((msg.msg_flags & MSG_NOTIFICATION) && (msg.msg_flags & MSG_EOR)
               && (ret < outl));

        if (ret > 0 && !(msg.msg_flags & MSG_EOR)) {
            /* Partial message read, this should never happen! */

            /*
             * The buffer was too small, this means the peer sent a message
             * that was larger than allowed.
             */
            if (ret == outl)
                return -1;

            /*
             * Test if socket buffer can handle max record size (2^14 + 2048
             * + 13)
             */
            optlen = (socklen_t) sizeof(int);
            ret = getsockopt(b->num, SOL_SOCKET, SO_RCVBUF, &optval, &optlen);
            if (ret >= 0)
                OPENSSL_assert(optval >= 18445);

            /*
             * Test if SCTP doesn't partially deliver below max record size
             * (2^14 + 2048 + 13)
             */
            optlen = (socklen_t) sizeof(int);
            ret =
                getsockopt(b->num, IPPROTO_SCTP, SCTP_PARTIAL_DELIVERY_POINT,
                           &optval, &optlen);
            if (ret >= 0)
                OPENSSL_assert(optval >= 18445);

            /*
             * Partially delivered notification??? Probably a bug....
             */
            OPENSSL_assert(!(msg.msg_flags & MSG_NOTIFICATION));

            /*
             * Everything seems ok till now, so it's most likely a message
             * dropped by PR-SCTP.
             */
            memset(out, 0, outl);
            BIO_set_retry_read(b);
            return -1;
        }

        BIO_clear_retry_flags(b);
        if (ret < 0) {
            if (BIO_dgram_should_retry(ret)) {
                BIO_set_retry_read(b);
                data->_errno = get_last_socket_error();
            }
        }

        /* Test if peer uses SCTP-AUTH before continuing */
        if (!data->peer_auth_tested) {
            int ii, auth_data = 0, auth_forward = 0;
            unsigned char *p;
            struct sctp_authchunks *authchunks;

            optlen =
                (socklen_t) (sizeof(sctp_assoc_t) + 256 * sizeof(uint8_t));
            authchunks = OPENSSL_malloc(optlen);
            memset(authchunks, 0, optlen);
            ii = getsockopt(b->num, IPPROTO_SCTP, SCTP_PEER_AUTH_CHUNKS,
                            authchunks, &optlen);

            if (ii >= 0)
                for (p = (unsigned char *)authchunks->gauth_chunks;
                     p < (unsigned char *)authchunks + optlen;
                     p += sizeof(uint8_t)) {
                    if (*p == OPENSSL_SCTP_DATA_CHUNK_TYPE)
                        auth_data = 1;
                    if (*p == OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE)
                        auth_forward = 1;
                }

            OPENSSL_free(authchunks);

            if (!auth_data || !auth_forward) {
                BIOerr(BIO_F_DGRAM_SCTP_READ, BIO_R_CONNECT_ERROR);
                return -1;
            }

            data->peer_auth_tested = 1;
        }
    }
    return (ret);
}
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static int dgram_sctp_write(BIO *b, const char *in, int inl)
1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398
{
    int ret;
    bio_dgram_sctp_data *data = (bio_dgram_sctp_data *) b->ptr;
    struct bio_dgram_sctp_sndinfo *sinfo = &(data->sndinfo);
    struct bio_dgram_sctp_prinfo *pinfo = &(data->prinfo);
    struct bio_dgram_sctp_sndinfo handshake_sinfo;
    struct iovec iov[1];
    struct msghdr msg;
    struct cmsghdr *cmsg;
#  if defined(SCTP_SNDINFO) && defined(SCTP_PRINFO)
    char cmsgbuf[CMSG_SPACE(sizeof(struct sctp_sndinfo)) +
                 CMSG_SPACE(sizeof(struct sctp_prinfo))];
    struct sctp_sndinfo *sndinfo;
    struct sctp_prinfo *prinfo;
#  else
    char cmsgbuf[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))];
    struct sctp_sndrcvinfo *sndrcvinfo;
#  endif
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    clear_socket_error();
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    /*
     * If we're send anything else than application data, disable all user
     * parameters and flags.
     */
    if (in[0] != 23) {
        memset(&handshake_sinfo, 0x00, sizeof(struct bio_dgram_sctp_sndinfo));
#  ifdef SCTP_SACK_IMMEDIATELY
        handshake_sinfo.snd_flags = SCTP_SACK_IMMEDIATELY;
#  endif
        sinfo = &handshake_sinfo;
    }

    /*
     * If we have to send a shutdown alert message and the socket is not dry
     * yet, we have to save it and send it as soon as the socket gets dry.
     */
    if (data->save_shutdown && !BIO_dgram_sctp_wait_for_dry(b)) {
        data->saved_message.bio = b;
        if (data->saved_message.data)
            OPENSSL_free(data->saved_message.data);
        data->saved_message.data = OPENSSL_malloc(inl);
        memcpy(data->saved_message.data, in, inl);
        data->saved_message.length = inl;
        return inl;
    }

    iov[0].iov_base = (char *)in;
    iov[0].iov_len = inl;
    msg.msg_name = NULL;
    msg.msg_namelen = 0;
    msg.msg_iov = iov;
    msg.msg_iovlen = 1;
    msg.msg_control = (caddr_t) cmsgbuf;
    msg.msg_controllen = 0;
    msg.msg_flags = 0;
#  if defined(SCTP_SNDINFO) && defined(SCTP_PRINFO)
    cmsg = (struct cmsghdr *)cmsgbuf;
    cmsg->cmsg_level = IPPROTO_SCTP;
    cmsg->cmsg_type = SCTP_SNDINFO;
    cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndinfo));
    sndinfo = (struct sctp_sndinfo *)CMSG_DATA(cmsg);
    memset(sndinfo, 0, sizeof(struct sctp_sndinfo));
    sndinfo->snd_sid = sinfo->snd_sid;
    sndinfo->snd_flags = sinfo->snd_flags;
    sndinfo->snd_ppid = sinfo->snd_ppid;
    sndinfo->snd_context = sinfo->snd_context;
    msg.msg_controllen += CMSG_SPACE(sizeof(struct sctp_sndinfo));

    cmsg =
        (struct cmsghdr *)&cmsgbuf[CMSG_SPACE(sizeof(struct sctp_sndinfo))];
    cmsg->cmsg_level = IPPROTO_SCTP;
    cmsg->cmsg_type = SCTP_PRINFO;
    cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_prinfo));
    prinfo = (struct sctp_prinfo *)CMSG_DATA(cmsg);
    memset(prinfo, 0, sizeof(struct sctp_prinfo));
    prinfo->pr_policy = pinfo->pr_policy;
    prinfo->pr_value = pinfo->pr_value;
    msg.msg_controllen += CMSG_SPACE(sizeof(struct sctp_prinfo));
#  else
    cmsg = (struct cmsghdr *)cmsgbuf;
    cmsg->cmsg_level = IPPROTO_SCTP;
    cmsg->cmsg_type = SCTP_SNDRCV;
    cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo));
    sndrcvinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
    memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
    sndrcvinfo->sinfo_stream = sinfo->snd_sid;
    sndrcvinfo->sinfo_flags = sinfo->snd_flags;
#   ifdef __FreeBSD__
    sndrcvinfo->sinfo_flags |= pinfo->pr_policy;
#   endif
    sndrcvinfo->sinfo_ppid = sinfo->snd_ppid;
    sndrcvinfo->sinfo_context = sinfo->snd_context;
    sndrcvinfo->sinfo_timetolive = pinfo->pr_value;
    msg.msg_controllen += CMSG_SPACE(sizeof(struct sctp_sndrcvinfo));
#  endif
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    ret = sendmsg(b->num, &msg, 0);
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    BIO_clear_retry_flags(b);
    if (ret <= 0) {
        if (BIO_dgram_should_retry(ret)) {
            BIO_set_retry_write(b);
            data->_errno = get_last_socket_error();
        }
    }
    return (ret);
}
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static long dgram_sctp_ctrl(BIO *b, int cmd, long num, void *ptr)
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{
    long ret = 1;
    bio_dgram_sctp_data *data = NULL;
    socklen_t sockopt_len = 0;
    struct sctp_authkeyid authkeyid;
    struct sctp_authkey *authkey = NULL;

    data = (bio_dgram_sctp_data *) b->ptr;

    switch (cmd) {
    case BIO_CTRL_DGRAM_QUERY_MTU:
        /*
         * Set to maximum (2^14) and ignore user input to enable transport
         * protocol fragmentation. Returns always 2^14.
         */
        data->mtu = 16384;
        ret = data->mtu;
        break;
    case BIO_CTRL_DGRAM_SET_MTU:
        /*
         * Set to maximum (2^14) and ignore input to enable transport
         * protocol fragmentation. Returns always 2^14.
         */
        data->mtu = 16384;
        ret = data->mtu;
        break;
    case BIO_CTRL_DGRAM_SET_CONNECTED:
    case BIO_CTRL_DGRAM_CONNECT:
        /* Returns always -1. */
        ret = -1;
        break;
    case BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT:
        /*
         * SCTP doesn't need the DTLS timer Returns always 1.
         */
        break;
    case BIO_CTRL_DGRAM_GET_MTU_OVERHEAD:
        /*
         * We allow transport protocol fragmentation so this is irrelevant
         */
        ret = 0;
        break;
    case BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE:
        if (num > 0)
            data->in_handshake = 1;
        else
            data->in_handshake = 0;

        ret =
            setsockopt(b->num, IPPROTO_SCTP, SCTP_NODELAY,
                       &data->in_handshake, sizeof(int));
        break;
    case BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY:
        /*
         * New shared key for SCTP AUTH. Returns 0 on success, -1 otherwise.
         */

        /* Get active key */
        sockopt_len = sizeof(struct sctp_authkeyid);
        ret =
            getsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY, &authkeyid,
                       &sockopt_len);
        if (ret < 0)
            break;

        /* Add new key */
        sockopt_len = sizeof(struct sctp_authkey) + 64 * sizeof(uint8_t);
        authkey = OPENSSL_malloc(sockopt_len);
        if (authkey == NULL) {
            ret = -1;
            break;
        }
        memset(authkey, 0x00, sockopt_len);
        authkey->sca_keynumber = authkeyid.scact_keynumber + 1;
#  ifndef __FreeBSD__
        /*
         * This field is missing in FreeBSD 8.2 and earlier, and FreeBSD 8.3
         * and higher work without it.
         */
        authkey->sca_keylength = 64;
#  endif
        memcpy(&authkey->sca_key[0], ptr, 64 * sizeof(uint8_t));

        ret =
            setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_KEY, authkey,
                       sockopt_len);
        OPENSSL_free(authkey);
        authkey = NULL;
        if (ret < 0)
            break;

        /* Reset active key */
        ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY,
                         &authkeyid, sizeof(struct sctp_authkeyid));
        if (ret < 0)
            break;

        break;
    case BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY:
        /* Returns 0 on success, -1 otherwise. */

        /* Get active key */
        sockopt_len = sizeof(struct sctp_authkeyid);
        ret =
            getsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY, &authkeyid,
                       &sockopt_len);
        if (ret < 0)
            break;

        /* Set active key */
        authkeyid.scact_keynumber = authkeyid.scact_keynumber + 1;
        ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY,
                         &authkeyid, sizeof(struct sctp_authkeyid));
        if (ret < 0)
            break;

        /*
         * CCS has been sent, so remember that and fall through to check if
         * we need to deactivate an old key
         */
        data->ccs_sent = 1;

    case BIO_CTRL_DGRAM_SCTP_AUTH_CCS_RCVD:
        /* Returns 0 on success, -1 otherwise. */

        /*
         * Has this command really been called or is this just a
         * fall-through?
         */
        if (cmd == BIO_CTRL_DGRAM_SCTP_AUTH_CCS_RCVD)
            data->ccs_rcvd = 1;

        /*
         * CSS has been both, received and sent, so deactivate an old key
         */
        if (data->ccs_rcvd == 1 && data->ccs_sent == 1) {
            /* Get active key */
            sockopt_len = sizeof(struct sctp_authkeyid);
            ret =
                getsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY,
                           &authkeyid, &sockopt_len);
            if (ret < 0)
                break;

            /*
             * Deactivate key or delete second last key if
             * SCTP_AUTHENTICATION_EVENT is not available.
             */
            authkeyid.scact_keynumber = authkeyid.scact_keynumber - 1;
#  ifdef SCTP_AUTH_DEACTIVATE_KEY
            sockopt_len = sizeof(struct sctp_authkeyid);
            ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_DEACTIVATE_KEY,
                             &authkeyid, sockopt_len);
            if (ret < 0)
                break;
#  endif
#  ifndef SCTP_AUTHENTICATION_EVENT
            if (authkeyid.scact_keynumber > 0) {
                authkeyid.scact_keynumber = authkeyid.scact_keynumber - 1;
                ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_DELETE_KEY,
                                 &authkeyid, sizeof(struct sctp_authkeyid));
                if (ret < 0)
                    break;
            }
#  endif
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            data->ccs_rcvd = 0;
            data->ccs_sent = 0;
        }
        break;
    case BIO_CTRL_DGRAM_SCTP_GET_SNDINFO:
        /* Returns the size of the copied struct. */
        if (num > (long)sizeof(struct bio_dgram_sctp_sndinfo))
            num = sizeof(struct bio_dgram_sctp_sndinfo);

        memcpy(ptr, &(data->sndinfo), num);
        ret = num;
        break;
    case BIO_CTRL_DGRAM_SCTP_SET_SNDINFO:
        /* Returns the size of the copied struct. */
        if (num > (long)sizeof(struct bio_dgram_sctp_sndinfo))
            num = sizeof(struct bio_dgram_sctp_sndinfo);

        memcpy(&(data->sndinfo), ptr, num);
        break;
    case BIO_CTRL_DGRAM_SCTP_GET_RCVINFO:
        /* Returns the size of the copied struct. */
        if (num > (long)sizeof(struct bio_dgram_sctp_rcvinfo))
            num = sizeof(struct bio_dgram_sctp_rcvinfo);

        memcpy(ptr, &data->rcvinfo, num);

        ret = num;
        break;
    case BIO_CTRL_DGRAM_SCTP_SET_RCVINFO:
        /* Returns the size of the copied struct. */
        if (num > (long)sizeof(struct bio_dgram_sctp_rcvinfo))
            num = sizeof(struct bio_dgram_sctp_rcvinfo);

        memcpy(&(data->rcvinfo), ptr, num);
        break;
    case BIO_CTRL_DGRAM_SCTP_GET_PRINFO:
        /* Returns the size of the copied struct. */
        if (num > (long)sizeof(struct bio_dgram_sctp_prinfo))
            num = sizeof(struct bio_dgram_sctp_prinfo);

        memcpy(ptr, &(data->prinfo), num);
        ret = num;
        break;
    case BIO_CTRL_DGRAM_SCTP_SET_PRINFO:
        /* Returns the size of the copied struct. */
        if (num > (long)sizeof(struct bio_dgram_sctp_prinfo))
            num = sizeof(struct bio_dgram_sctp_prinfo);

        memcpy(&(data->prinfo), ptr, num);
        break;
    case BIO_CTRL_DGRAM_SCTP_SAVE_SHUTDOWN:
        /* Returns always 1. */
        if (num > 0)
            data->save_shutdown = 1;
        else
            data->save_shutdown = 0;
        break;

    default:
        /*
         * Pass to default ctrl function to process SCTP unspecific commands
         */
        ret = dgram_ctrl(b, cmd, num, ptr);
        break;
    }
    return (ret);
}
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int BIO_dgram_sctp_notification_cb(BIO *b,
1726 1727 1728 1729
                                   void (*handle_notifications) (BIO *bio,
                                                                 void
                                                                 *context,
                                                                 void *buf),
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                                   void *context)
1731 1732
{
    bio_dgram_sctp_data *data = (bio_dgram_sctp_data *) b->ptr;
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    if (handle_notifications != NULL) {
        data->handle_notifications = handle_notifications;
        data->notification_context = context;
    } else
        return -1;
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    return 0;
}
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int BIO_dgram_sctp_wait_for_dry(BIO *b)
{
1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857
    int is_dry = 0;
    int n, sockflags, ret;
    union sctp_notification snp;
    struct msghdr msg;
    struct iovec iov;
#  ifdef SCTP_EVENT
    struct sctp_event event;
#  else
    struct sctp_event_subscribe event;
    socklen_t eventsize;
#  endif
    bio_dgram_sctp_data *data = (bio_dgram_sctp_data *) b->ptr;

    /* set sender dry event */
#  ifdef SCTP_EVENT
    memset(&event, 0, sizeof(struct sctp_event));
    event.se_assoc_id = 0;
    event.se_type = SCTP_SENDER_DRY_EVENT;
    event.se_on = 1;
    ret =
        setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENT, &event,
                   sizeof(struct sctp_event));
#  else
    eventsize = sizeof(struct sctp_event_subscribe);
    ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, &eventsize);
    if (ret < 0)
        return -1;

    event.sctp_sender_dry_event = 1;

    ret =
        setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event,
                   sizeof(struct sctp_event_subscribe));
#  endif
    if (ret < 0)
        return -1;

    /* peek for notification */
    memset(&snp, 0x00, sizeof(union sctp_notification));
    iov.iov_base = (char *)&snp;
    iov.iov_len = sizeof(union sctp_notification);
    msg.msg_name = NULL;
    msg.msg_namelen = 0;
    msg.msg_iov = &iov;
    msg.msg_iovlen = 1;
    msg.msg_control = NULL;
    msg.msg_controllen = 0;
    msg.msg_flags = 0;

    n = recvmsg(b->num, &msg, MSG_PEEK);
    if (n <= 0) {
        if ((n < 0) && (get_last_socket_error() != EAGAIN)
            && (get_last_socket_error() != EWOULDBLOCK))
            return -1;
        else
            return 0;
    }

    /* if we find a notification, process it and try again if necessary */
    while (msg.msg_flags & MSG_NOTIFICATION) {
        memset(&snp, 0x00, sizeof(union sctp_notification));
        iov.iov_base = (char *)&snp;
        iov.iov_len = sizeof(union sctp_notification);
        msg.msg_name = NULL;
        msg.msg_namelen = 0;
        msg.msg_iov = &iov;
        msg.msg_iovlen = 1;
        msg.msg_control = NULL;
        msg.msg_controllen = 0;
        msg.msg_flags = 0;

        n = recvmsg(b->num, &msg, 0);
        if (n <= 0) {
            if ((n < 0) && (get_last_socket_error() != EAGAIN)
                && (get_last_socket_error() != EWOULDBLOCK))
                return -1;
            else
                return is_dry;
        }

        if (snp.sn_header.sn_type == SCTP_SENDER_DRY_EVENT) {
            is_dry = 1;

            /* disable sender dry event */
#  ifdef SCTP_EVENT
            memset(&event, 0, sizeof(struct sctp_event));
            event.se_assoc_id = 0;
            event.se_type = SCTP_SENDER_DRY_EVENT;
            event.se_on = 0;
            ret =
                setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENT, &event,
                           sizeof(struct sctp_event));
#  else
            eventsize = (socklen_t) sizeof(struct sctp_event_subscribe);
            ret =
                getsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event,
                           &eventsize);
            if (ret < 0)
                return -1;

            event.sctp_sender_dry_event = 0;

            ret =
                setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event,
                           sizeof(struct sctp_event_subscribe));
#  endif
            if (ret < 0)
                return -1;
        }
#  ifdef SCTP_AUTHENTICATION_EVENT
        if (snp.sn_header.sn_type == SCTP_AUTHENTICATION_EVENT)
            dgram_sctp_handle_auth_free_key_event(b, &snp);
#  endif
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        if (data->handle_notifications != NULL)
            data->handle_notifications(b, data->notification_context,
                                       (void *)&snp);

        /* found notification, peek again */
        memset(&snp, 0x00, sizeof(union sctp_notification));
        iov.iov_base = (char *)&snp;
        iov.iov_len = sizeof(union sctp_notification);
        msg.msg_name = NULL;
        msg.msg_namelen = 0;
        msg.msg_iov = &iov;
        msg.msg_iovlen = 1;
        msg.msg_control = NULL;
        msg.msg_controllen = 0;
        msg.msg_flags = 0;

        /* if we have seen the dry already, don't wait */
        if (is_dry) {
            sockflags = fcntl(b->num, F_GETFL, 0);
            fcntl(b->num, F_SETFL, O_NONBLOCK);
        }

        n = recvmsg(b->num, &msg, MSG_PEEK);

        if (is_dry) {
            fcntl(b->num, F_SETFL, sockflags);
        }

        if (n <= 0) {
            if ((n < 0) && (get_last_socket_error() != EAGAIN)
                && (get_last_socket_error() != EWOULDBLOCK))
                return -1;
            else
                return is_dry;
        }
    }

    /* read anything else */
    return is_dry;
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}

int BIO_dgram_sctp_msg_waiting(BIO *b)
1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931
{
    int n, sockflags;
    union sctp_notification snp;
    struct msghdr msg;
    struct iovec iov;
    bio_dgram_sctp_data *data = (bio_dgram_sctp_data *) b->ptr;

    /* Check if there are any messages waiting to be read */
    do {
        memset(&snp, 0x00, sizeof(union sctp_notification));
        iov.iov_base = (char *)&snp;
        iov.iov_len = sizeof(union sctp_notification);
        msg.msg_name = NULL;
        msg.msg_namelen = 0;
        msg.msg_iov = &iov;
        msg.msg_iovlen = 1;
        msg.msg_control = NULL;
        msg.msg_controllen = 0;
        msg.msg_flags = 0;

        sockflags = fcntl(b->num, F_GETFL, 0);
        fcntl(b->num, F_SETFL, O_NONBLOCK);
        n = recvmsg(b->num, &msg, MSG_PEEK);
        fcntl(b->num, F_SETFL, sockflags);

        /* if notification, process and try again */
        if (n > 0 && (msg.msg_flags & MSG_NOTIFICATION)) {
#  ifdef SCTP_AUTHENTICATION_EVENT
            if (snp.sn_header.sn_type == SCTP_AUTHENTICATION_EVENT)
                dgram_sctp_handle_auth_free_key_event(b, &snp);
#  endif
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            memset(&snp, 0x00, sizeof(union sctp_notification));
            iov.iov_base = (char *)&snp;
            iov.iov_len = sizeof(union sctp_notification);
            msg.msg_name = NULL;
            msg.msg_namelen = 0;
            msg.msg_iov = &iov;
            msg.msg_iovlen = 1;
            msg.msg_control = NULL;
            msg.msg_controllen = 0;
            msg.msg_flags = 0;
            n = recvmsg(b->num, &msg, 0);

            if (data->handle_notifications != NULL)
                data->handle_notifications(b, data->notification_context,
                                           (void *)&snp);
        }

    } while (n > 0 && (msg.msg_flags & MSG_NOTIFICATION));

    /* Return 1 if there is a message to be read, return 0 otherwise. */
    if (n > 0)
        return 1;
    else
        return 0;
}
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static int dgram_sctp_puts(BIO *bp, const char *str)
1960 1961
{
    int n, ret;
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    n = strlen(str);
    ret = dgram_sctp_write(bp, str, n);
    return (ret);
}
# endif
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1969
static int BIO_dgram_should_retry(int i)
1970 1971
{
    int err;
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    if ((i == 0) || (i == -1)) {
        err = get_last_socket_error();
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# if defined(OPENSSL_SYS_WINDOWS)
        /*
         * If the socket return value (i) is -1 and err is unexpectedly 0 at
         * this point, the error code was overwritten by another system call
         * before this error handling is called.
         */
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# endif

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        return (BIO_dgram_non_fatal_error(err));
    }
    return (0);
}

int BIO_dgram_non_fatal_error(int err)
{
    switch (err) {
# if defined(OPENSSL_SYS_WINDOWS)
#  if defined(WSAEWOULDBLOCK)
    case WSAEWOULDBLOCK:
#  endif

#  if 0                         /* This appears to always be an error */
#   if defined(WSAENOTCONN)
    case WSAENOTCONN:
#   endif
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#  endif
# endif

2004 2005 2006 2007 2008 2009 2010
# ifdef EWOULDBLOCK
#  ifdef WSAEWOULDBLOCK
#   if WSAEWOULDBLOCK != EWOULDBLOCK
    case EWOULDBLOCK:
#   endif
#  else
    case EWOULDBLOCK:
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#  endif
# endif

2014 2015 2016
# ifdef EINTR
    case EINTR:
# endif
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2018 2019 2020 2021
# ifdef EAGAIN
#  if EWOULDBLOCK != EAGAIN
    case EAGAIN:
#  endif
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# endif

2024 2025 2026
# ifdef EPROTO
    case EPROTO:
# endif
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# ifdef EINPROGRESS
    case EINPROGRESS:
# endif
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# ifdef EALREADY
    case EALREADY:
# endif
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        return (1);
        /* break; */
    default:
        break;
    }
    return (0);
}
2043 2044

static void get_current_time(struct timeval *t)
2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070
{
# if defined(_WIN32)
    SYSTEMTIME st;
    union {
        unsigned __int64 ul;
        FILETIME ft;
    } now;

    GetSystemTime(&st);
    SystemTimeToFileTime(&st, &now.ft);
#  ifdef  __MINGW32__
    now.ul -= 116444736000000000ULL;
#  else
    now.ul -= 116444736000000000U I64; /* re-bias to 1/1/1970 */
#  endif
    t->tv_sec = (long)(now.ul / 10000000);
    t->tv_usec = ((int)(now.ul % 10000000)) / 10;
# elif defined(OPENSSL_SYS_VMS)
    struct timeb tb;
    ftime(&tb);
    t->tv_sec = (long)tb.time;
    t->tv_usec = (long)tb.millitm * 1000;
# else
    gettimeofday(t, NULL);
# endif
}
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#endif