int dtls_get_message(SSL *s, int *mt, size_t *len)
{
    struct hm_header_st *msg_hdr;
    unsigned char *p;
    size_t msg_len;
    size_t tmplen;
    int errtype;
    msg_hdr = &s->d1->r_msg_hdr;
    memset(msg_hdr, 0, sizeof(*msg_hdr));
 again:
    if (!dtls_get_reassembled_message(s, &errtype, &tmplen)) {
        if (errtype == DTLS1_HM_BAD_FRAGMENT
                || errtype == DTLS1_HM_FRAGMENT_RETRY) {
            goto again;
        }
        return 0;
    }
    *mt = s->s3->tmp.message_type;
    p = (unsigned char *)s->init_buf->data;
    *len = s->init_num;
    if (*mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
        if (s->msg_callback) {
            s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC,
                            p, 1, s, s->msg_callback_arg);
        }
        return 1;
    }
    msg_len = msg_hdr->msg_len;
    *(p++) = msg_hdr->type;
    l2n3(msg_len, p);
    s2n(msg_hdr->seq, p);
    l2n3(0, p);
    l2n3(msg_len, p);
    if (s->version != DTLS1_BAD_VER) {
        p -= DTLS1_HM_HEADER_LENGTH;
        msg_len += DTLS1_HM_HEADER_LENGTH;
    }
    if (!ssl3_finish_mac(s, p, msg_len))
        return 0;
    if (s->msg_callback)
        s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
                        p, msg_len, s, s->msg_callback_arg);
    memset(msg_hdr, 0, sizeof(*msg_hdr));
    s->d1->handshake_read_seq++;
    s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH;
    return 1;
}
['int dtls_get_message(SSL *s, int *mt, size_t *len)\n{\n    struct hm_header_st *msg_hdr;\n    unsigned char *p;\n    size_t msg_len;\n    size_t tmplen;\n    int errtype;\n    msg_hdr = &s->d1->r_msg_hdr;\n    memset(msg_hdr, 0, sizeof(*msg_hdr));\n again:\n    if (!dtls_get_reassembled_message(s, &errtype, &tmplen)) {\n        if (errtype == DTLS1_HM_BAD_FRAGMENT\n                || errtype == DTLS1_HM_FRAGMENT_RETRY) {\n            goto again;\n        }\n        return 0;\n    }\n    *mt = s->s3->tmp.message_type;\n    p = (unsigned char *)s->init_buf->data;\n    *len = s->init_num;\n    if (*mt == SSL3_MT_CHANGE_CIPHER_SPEC) {\n        if (s->msg_callback) {\n            s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC,\n                            p, 1, s, s->msg_callback_arg);\n        }\n        return 1;\n    }\n    msg_len = msg_hdr->msg_len;\n    *(p++) = msg_hdr->type;\n    l2n3(msg_len, p);\n    s2n(msg_hdr->seq, p);\n    l2n3(0, p);\n    l2n3(msg_len, p);\n    if (s->version != DTLS1_BAD_VER) {\n        p -= DTLS1_HM_HEADER_LENGTH;\n        msg_len += DTLS1_HM_HEADER_LENGTH;\n    }\n    if (!ssl3_finish_mac(s, p, msg_len))\n        return 0;\n    if (s->msg_callback)\n        s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,\n                        p, msg_len, s, s->msg_callback_arg);\n    memset(msg_hdr, 0, sizeof(*msg_hdr));\n    s->d1->handshake_read_seq++;\n    s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH;\n    return 1;\n}', 'static int dtls_get_reassembled_message(SSL *s, int *errtype, size_t *len)\n{\n    unsigned char wire[DTLS1_HM_HEADER_LENGTH];\n    size_t mlen, frag_off, frag_len;\n    int i, ret, recvd_type;\n    struct hm_header_st msg_hdr;\n    size_t readbytes;\n    *errtype = 0;\n redo:\n    ret = dtls1_retrieve_buffered_fragment(s, &frag_len);\n    if (ret < 0) {\n        return 0;\n    }\n    if (ret > 0) {\n        s->init_num = frag_len;\n        *len = frag_len;\n        return 1;\n    }\n    i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, &recvd_type, wire,\n                                  DTLS1_HM_HEADER_LENGTH, 0, &readbytes);\n    if (i <= 0) {\n        s->rwstate = SSL_READING;\n        *len = 0;\n        return 0;\n    }\n    if (recvd_type == SSL3_RT_CHANGE_CIPHER_SPEC) {\n        if (wire[0] != SSL3_MT_CCS) {\n            SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE,\n                     SSL_F_DTLS_GET_REASSEMBLED_MESSAGE,\n                     SSL_R_BAD_CHANGE_CIPHER_SPEC);\n            goto f_err;\n        }\n        memcpy(s->init_buf->data, wire, readbytes);\n        s->init_num = readbytes - 1;\n        s->init_msg = s->init_buf->data + 1;\n        s->s3->tmp.message_type = SSL3_MT_CHANGE_CIPHER_SPEC;\n        s->s3->tmp.message_size = readbytes - 1;\n        *len = readbytes - 1;\n        return 1;\n    }\n    if (readbytes != DTLS1_HM_HEADER_LENGTH) {\n        SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE,\n                 SSL_F_DTLS_GET_REASSEMBLED_MESSAGE, SSL_R_UNEXPECTED_MESSAGE);\n        goto f_err;\n    }\n    dtls1_get_message_header(wire, &msg_hdr);\n    mlen = msg_hdr.msg_len;\n    frag_off = msg_hdr.frag_off;\n    frag_len = msg_hdr.frag_len;\n    if (frag_len > RECORD_LAYER_get_rrec_length(&s->rlayer)) {\n        SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,\n                 SSL_F_DTLS_GET_REASSEMBLED_MESSAGE, SSL_R_BAD_LENGTH);\n        goto f_err;\n    }\n    if (msg_hdr.seq != s->d1->handshake_read_seq) {\n        *errtype = dtls1_process_out_of_seq_message(s, &msg_hdr);\n        return 0;\n    }\n    if (frag_len && frag_len < mlen) {\n        *errtype = dtls1_reassemble_fragment(s, &msg_hdr);\n        return 0;\n    }\n    if (!s->server\n            && s->d1->r_msg_hdr.frag_off == 0\n            && s->statem.hand_state != TLS_ST_OK\n            && wire[0] == SSL3_MT_HELLO_REQUEST) {\n        if (wire[1] == 0 && wire[2] == 0 && wire[3] == 0) {\n            if (s->msg_callback)\n                s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,\n                                wire, DTLS1_HM_HEADER_LENGTH, s,\n                                s->msg_callback_arg);\n            s->init_num = 0;\n            goto redo;\n        } else {\n            SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE,\n                     SSL_F_DTLS_GET_REASSEMBLED_MESSAGE,\n                     SSL_R_UNEXPECTED_MESSAGE);\n            goto f_err;\n        }\n    }\n    if (!dtls1_preprocess_fragment(s, &msg_hdr)) {\n        goto f_err;\n    }\n    if (frag_len > 0) {\n        unsigned char *p =\n            (unsigned char *)s->init_buf->data + DTLS1_HM_HEADER_LENGTH;\n        i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, NULL,\n                                      &p[frag_off], frag_len, 0, &readbytes);\n        if (i <= 0) {\n            s->rwstate = SSL_READING;\n            *len = 0;\n            return 0;\n        }\n    } else {\n        readbytes = 0;\n    }\n    if (readbytes != frag_len) {\n        SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,\n                 SSL_F_DTLS_GET_REASSEMBLED_MESSAGE, SSL_R_BAD_LENGTH);\n        goto f_err;\n    }\n    *len = s->init_num = frag_len;\n    return 1;\n f_err:\n    s->init_num = 0;\n    *len = 0;\n    return 0;\n}', 'static int dtls1_retrieve_buffered_fragment(SSL *s, size_t *len)\n{\n    pitem *item;\n    hm_fragment *frag;\n    int ret;\n    do {\n        item = pqueue_peek(s->d1->buffered_messages);\n        if (item == NULL)\n            return 0;\n        frag = (hm_fragment *)item->data;\n        if (frag->msg_header.seq < s->d1->handshake_read_seq) {\n            pqueue_pop(s->d1->buffered_messages);\n            dtls1_hm_fragment_free(frag);\n            pitem_free(item);\n            item = NULL;\n            frag = NULL;\n        }\n    } while (item == NULL);\n    if (frag->reassembly != NULL)\n        return 0;\n    if (s->d1->handshake_read_seq == frag->msg_header.seq) {\n        size_t frag_len = frag->msg_header.frag_len;\n        pqueue_pop(s->d1->buffered_messages);\n        ret = dtls1_preprocess_fragment(s, &frag->msg_header);\n        if (ret) {\n            unsigned char *p =\n                (unsigned char *)s->init_buf->data + DTLS1_HM_HEADER_LENGTH;\n            memcpy(&p[frag->msg_header.frag_off], frag->fragment,\n                   frag->msg_header.frag_len);\n        }\n        dtls1_hm_fragment_free(frag);\n        pitem_free(item);\n        if (ret) {\n            *len = frag_len;\n            return 1;\n        }\n        s->init_num = 0;\n        return -1;\n    } else {\n        return 0;\n    }\n}']