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- #include "e_os.h"
- #include <stdio.h>
- #include <openssl/objects.h>
- #include <openssl/rand.h>
- #include "ssl_local.h"
- static void get_current_time(struct timeval *t);
- static int dtls1_handshake_write(SSL *s);
- static size_t dtls1_link_min_mtu(void);
- static const size_t g_probable_mtu[] = { 1500, 512, 256 };
- const SSL3_ENC_METHOD DTLSv1_enc_data = {
- tls1_enc,
- tls1_mac,
- tls1_setup_key_block,
- tls1_generate_master_secret,
- tls1_change_cipher_state,
- tls1_final_finish_mac,
- TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
- TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
- tls1_alert_code,
- tls1_export_keying_material,
- SSL_ENC_FLAG_DTLS | SSL_ENC_FLAG_EXPLICIT_IV,
- dtls1_set_handshake_header,
- dtls1_close_construct_packet,
- dtls1_handshake_write
- };
- const SSL3_ENC_METHOD DTLSv1_2_enc_data = {
- tls1_enc,
- tls1_mac,
- tls1_setup_key_block,
- tls1_generate_master_secret,
- tls1_change_cipher_state,
- tls1_final_finish_mac,
- TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
- TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
- tls1_alert_code,
- tls1_export_keying_material,
- SSL_ENC_FLAG_DTLS | SSL_ENC_FLAG_EXPLICIT_IV | SSL_ENC_FLAG_SIGALGS
- | SSL_ENC_FLAG_SHA256_PRF | SSL_ENC_FLAG_TLS1_2_CIPHERS,
- dtls1_set_handshake_header,
- dtls1_close_construct_packet,
- dtls1_handshake_write
- };
- long dtls1_default_timeout(void)
- {
-
- return (60 * 60 * 2);
- }
- int dtls1_new(SSL *s)
- {
- DTLS1_STATE *d1;
- if (!DTLS_RECORD_LAYER_new(&s->rlayer)) {
- return 0;
- }
- if (!ssl3_new(s))
- return 0;
- if ((d1 = OPENSSL_zalloc(sizeof(*d1))) == NULL) {
- ssl3_free(s);
- return 0;
- }
- d1->buffered_messages = pqueue_new();
- d1->sent_messages = pqueue_new();
- if (s->server) {
- d1->cookie_len = sizeof(s->d1->cookie);
- }
- d1->link_mtu = 0;
- d1->mtu = 0;
- if (d1->buffered_messages == NULL || d1->sent_messages == NULL) {
- pqueue_free(d1->buffered_messages);
- pqueue_free(d1->sent_messages);
- OPENSSL_free(d1);
- ssl3_free(s);
- return 0;
- }
- s->d1 = d1;
- if (!s->method->ssl_clear(s))
- return 0;
- return 1;
- }
- static void dtls1_clear_queues(SSL *s)
- {
- dtls1_clear_received_buffer(s);
- dtls1_clear_sent_buffer(s);
- }
- void dtls1_clear_received_buffer(SSL *s)
- {
- pitem *item = NULL;
- hm_fragment *frag = NULL;
- while ((item = pqueue_pop(s->d1->buffered_messages)) != NULL) {
- frag = (hm_fragment *)item->data;
- dtls1_hm_fragment_free(frag);
- pitem_free(item);
- }
- }
- void dtls1_clear_sent_buffer(SSL *s)
- {
- pitem *item = NULL;
- hm_fragment *frag = NULL;
- while ((item = pqueue_pop(s->d1->sent_messages)) != NULL) {
- frag = (hm_fragment *)item->data;
- dtls1_hm_fragment_free(frag);
- pitem_free(item);
- }
- }
- void dtls1_free(SSL *s)
- {
- DTLS_RECORD_LAYER_free(&s->rlayer);
- ssl3_free(s);
- if (s->d1 != NULL) {
- dtls1_clear_queues(s);
- pqueue_free(s->d1->buffered_messages);
- pqueue_free(s->d1->sent_messages);
- }
- OPENSSL_free(s->d1);
- s->d1 = NULL;
- }
- int dtls1_clear(SSL *s)
- {
- pqueue *buffered_messages;
- pqueue *sent_messages;
- size_t mtu;
- size_t link_mtu;
- DTLS_RECORD_LAYER_clear(&s->rlayer);
- if (s->d1) {
- DTLS_timer_cb timer_cb = s->d1->timer_cb;
- buffered_messages = s->d1->buffered_messages;
- sent_messages = s->d1->sent_messages;
- mtu = s->d1->mtu;
- link_mtu = s->d1->link_mtu;
- dtls1_clear_queues(s);
- memset(s->d1, 0, sizeof(*s->d1));
-
- s->d1->timer_cb = timer_cb;
- if (s->server) {
- s->d1->cookie_len = sizeof(s->d1->cookie);
- }
- if (SSL_get_options(s) & SSL_OP_NO_QUERY_MTU) {
- s->d1->mtu = mtu;
- s->d1->link_mtu = link_mtu;
- }
- s->d1->buffered_messages = buffered_messages;
- s->d1->sent_messages = sent_messages;
- }
- if (!ssl3_clear(s))
- return 0;
- if (s->method->version == DTLS_ANY_VERSION)
- s->version = DTLS_MAX_VERSION;
- #ifndef OPENSSL_NO_DTLS1_METHOD
- else if (s->options & SSL_OP_CISCO_ANYCONNECT)
- s->client_version = s->version = DTLS1_BAD_VER;
- #endif
- else
- s->version = s->method->version;
- return 1;
- }
- long dtls1_ctrl(SSL *s, int cmd, long larg, void *parg)
- {
- int ret = 0;
- switch (cmd) {
- case DTLS_CTRL_GET_TIMEOUT:
- if (dtls1_get_timeout(s, (struct timeval *)parg) != NULL) {
- ret = 1;
- }
- break;
- case DTLS_CTRL_HANDLE_TIMEOUT:
- ret = dtls1_handle_timeout(s);
- break;
- case DTLS_CTRL_SET_LINK_MTU:
- if (larg < (long)dtls1_link_min_mtu())
- return 0;
- s->d1->link_mtu = larg;
- return 1;
- case DTLS_CTRL_GET_LINK_MIN_MTU:
- return (long)dtls1_link_min_mtu();
- case SSL_CTRL_SET_MTU:
-
- if (larg < (long)dtls1_link_min_mtu() - DTLS1_MAX_MTU_OVERHEAD)
- return 0;
- s->d1->mtu = larg;
- return larg;
- default:
- ret = ssl3_ctrl(s, cmd, larg, parg);
- break;
- }
- return ret;
- }
- void dtls1_start_timer(SSL *s)
- {
- unsigned int sec, usec;
- #ifndef OPENSSL_NO_SCTP
-
- if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
- memset(&s->d1->next_timeout, 0, sizeof(s->d1->next_timeout));
- return;
- }
- #endif
-
- if (s->d1->next_timeout.tv_sec == 0 && s->d1->next_timeout.tv_usec == 0) {
- if (s->d1->timer_cb != NULL)
- s->d1->timeout_duration_us = s->d1->timer_cb(s, 0);
- else
- s->d1->timeout_duration_us = 1000000;
- }
-
- get_current_time(&(s->d1->next_timeout));
-
- sec = s->d1->timeout_duration_us / 1000000;
- usec = s->d1->timeout_duration_us - (sec * 1000000);
- s->d1->next_timeout.tv_sec += sec;
- s->d1->next_timeout.tv_usec += usec;
- if (s->d1->next_timeout.tv_usec >= 1000000) {
- s->d1->next_timeout.tv_sec++;
- s->d1->next_timeout.tv_usec -= 1000000;
- }
- BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT, 0,
- &(s->d1->next_timeout));
- }
- struct timeval *dtls1_get_timeout(SSL *s, struct timeval *timeleft)
- {
- struct timeval timenow;
-
- if (s->d1->next_timeout.tv_sec == 0 && s->d1->next_timeout.tv_usec == 0) {
- return NULL;
- }
-
- get_current_time(&timenow);
-
- if (s->d1->next_timeout.tv_sec < timenow.tv_sec ||
- (s->d1->next_timeout.tv_sec == timenow.tv_sec &&
- s->d1->next_timeout.tv_usec <= timenow.tv_usec)) {
- memset(timeleft, 0, sizeof(*timeleft));
- return timeleft;
- }
-
- memcpy(timeleft, &(s->d1->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_usec < 15000) {
- memset(timeleft, 0, sizeof(*timeleft));
- }
- return timeleft;
- }
- int dtls1_is_timer_expired(SSL *s)
- {
- struct timeval timeleft;
-
- if (dtls1_get_timeout(s, &timeleft) == NULL) {
- return 0;
- }
-
- if (timeleft.tv_sec > 0 || timeleft.tv_usec > 0) {
- return 0;
- }
-
- return 1;
- }
- static void dtls1_double_timeout(SSL *s)
- {
- s->d1->timeout_duration_us *= 2;
- if (s->d1->timeout_duration_us > 60000000)
- s->d1->timeout_duration_us = 60000000;
- }
- void dtls1_stop_timer(SSL *s)
- {
-
- memset(&s->d1->timeout, 0, sizeof(s->d1->timeout));
- memset(&s->d1->next_timeout, 0, sizeof(s->d1->next_timeout));
- s->d1->timeout_duration_us = 1000000;
- BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT, 0,
- &(s->d1->next_timeout));
-
- dtls1_clear_sent_buffer(s);
- }
- int dtls1_check_timeout_num(SSL *s)
- {
- size_t mtu;
- s->d1->timeout.num_alerts++;
-
- if (s->d1->timeout.num_alerts > 2
- && !(SSL_get_options(s) & SSL_OP_NO_QUERY_MTU)) {
- mtu =
- BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_GET_FALLBACK_MTU, 0, NULL);
- if (mtu < s->d1->mtu)
- s->d1->mtu = mtu;
- }
- if (s->d1->timeout.num_alerts > DTLS1_TMO_ALERT_COUNT) {
-
- SSLfatal(s, SSL_AD_NO_ALERT, SSL_F_DTLS1_CHECK_TIMEOUT_NUM,
- SSL_R_READ_TIMEOUT_EXPIRED);
- return -1;
- }
- return 0;
- }
- int dtls1_handle_timeout(SSL *s)
- {
-
- if (!dtls1_is_timer_expired(s)) {
- return 0;
- }
- if (s->d1->timer_cb != NULL)
- s->d1->timeout_duration_us = s->d1->timer_cb(s, s->d1->timeout_duration_us);
- else
- dtls1_double_timeout(s);
- if (dtls1_check_timeout_num(s) < 0) {
-
- return -1;
- }
- s->d1->timeout.read_timeouts++;
- if (s->d1->timeout.read_timeouts > DTLS1_TMO_READ_COUNT) {
- s->d1->timeout.read_timeouts = 1;
- }
- dtls1_start_timer(s);
-
- return dtls1_retransmit_buffered_messages(s);
- }
- static void get_current_time(struct timeval *t)
- {
- #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 -= 116444736000000000UI64;
-
- # endif
- t->tv_sec = (long)(now.ul / 10000000);
- t->tv_usec = ((int)(now.ul % 10000000)) / 10;
- #else
- gettimeofday(t, NULL);
- #endif
- }
- #define LISTEN_SUCCESS 2
- #define LISTEN_SEND_VERIFY_REQUEST 1
- #ifndef OPENSSL_NO_SOCK
- int DTLSv1_listen(SSL *s, BIO_ADDR *client)
- {
- int next, n, ret = 0;
- unsigned char cookie[DTLS1_COOKIE_LENGTH];
- unsigned char seq[SEQ_NUM_SIZE];
- const unsigned char *data;
- unsigned char *buf, *wbuf;
- size_t fragoff, fraglen, msglen, reclen, align = 0;
- unsigned int rectype, versmajor, msgseq, msgtype, clientvers, cookielen;
- BIO *rbio, *wbio;
- BIO_ADDR *tmpclient = NULL;
- PACKET pkt, msgpkt, msgpayload, session, cookiepkt;
- if (s->handshake_func == NULL) {
-
- SSL_set_accept_state(s);
- }
-
- if (!SSL_clear(s))
- return -1;
- ERR_clear_error();
- rbio = SSL_get_rbio(s);
- wbio = SSL_get_wbio(s);
- if (!rbio || !wbio) {
- SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_BIO_NOT_SET);
- return -1;
- }
-
- if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) {
- SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_UNSUPPORTED_SSL_VERSION);
- return -1;
- }
- if (!ssl3_setup_buffers(s)) {
-
- return -1;
- }
- buf = RECORD_LAYER_get_rbuf(&s->rlayer)->buf;
- wbuf = RECORD_LAYER_get_wbuf(&s->rlayer)[0].buf;
- #if defined(SSL3_ALIGN_PAYLOAD)
- # if SSL3_ALIGN_PAYLOAD != 0
-
- align = (size_t)buf + SSL3_RT_HEADER_LENGTH;
- align = SSL3_ALIGN_PAYLOAD - 1 - ((align - 1) % SSL3_ALIGN_PAYLOAD);
- # endif
- #endif
- buf += align;
- do {
-
- clear_sys_error();
- n = BIO_read(rbio, buf, SSL3_RT_MAX_PLAIN_LENGTH
- + DTLS1_RT_HEADER_LENGTH);
- if (n <= 0) {
- if (BIO_should_retry(rbio)) {
-
- goto end;
- }
- return -1;
- }
- if (!PACKET_buf_init(&pkt, buf, n)) {
- SSLerr(SSL_F_DTLSV1_LISTEN, ERR_R_INTERNAL_ERROR);
- return -1;
- }
-
-
- if (n < DTLS1_RT_HEADER_LENGTH) {
- SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_RECORD_TOO_SMALL);
- goto end;
- }
- if (s->msg_callback)
- s->msg_callback(0, 0, SSL3_RT_HEADER, buf,
- DTLS1_RT_HEADER_LENGTH, s, s->msg_callback_arg);
-
- if (!PACKET_get_1(&pkt, &rectype)
- || !PACKET_get_1(&pkt, &versmajor)) {
- SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_LENGTH_MISMATCH);
- goto end;
- }
- if (rectype != SSL3_RT_HANDSHAKE) {
- SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_UNEXPECTED_MESSAGE);
- goto end;
- }
-
- if (versmajor != DTLS1_VERSION_MAJOR) {
- SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
- goto end;
- }
- if (!PACKET_forward(&pkt, 1)
-
- || !PACKET_copy_bytes(&pkt, seq, SEQ_NUM_SIZE)
- || !PACKET_get_length_prefixed_2(&pkt, &msgpkt)) {
- SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_LENGTH_MISMATCH);
- goto end;
- }
- reclen = PACKET_remaining(&msgpkt);
-
-
- if (seq[0] != 0 || seq[1] != 0) {
- SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_UNEXPECTED_MESSAGE);
- goto end;
- }
-
- data = PACKET_data(&msgpkt);
-
- if (!PACKET_get_1(&msgpkt, &msgtype)
- || !PACKET_get_net_3_len(&msgpkt, &msglen)
- || !PACKET_get_net_2(&msgpkt, &msgseq)
- || !PACKET_get_net_3_len(&msgpkt, &fragoff)
- || !PACKET_get_net_3_len(&msgpkt, &fraglen)
- || !PACKET_get_sub_packet(&msgpkt, &msgpayload, fraglen)
- || PACKET_remaining(&msgpkt) != 0) {
- SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_LENGTH_MISMATCH);
- goto end;
- }
- if (msgtype != SSL3_MT_CLIENT_HELLO) {
- SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_UNEXPECTED_MESSAGE);
- goto end;
- }
-
- if (msgseq > 2) {
- SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_INVALID_SEQUENCE_NUMBER);
- goto end;
- }
-
- if (fragoff != 0 || fraglen > msglen) {
-
- SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_FRAGMENTED_CLIENT_HELLO);
- goto end;
- }
- if (s->msg_callback)
- s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, data,
- fraglen + DTLS1_HM_HEADER_LENGTH, s,
- s->msg_callback_arg);
- if (!PACKET_get_net_2(&msgpayload, &clientvers)) {
- SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_LENGTH_MISMATCH);
- goto end;
- }
-
- if (DTLS_VERSION_LT(clientvers, (unsigned int)s->method->version) &&
- s->method->version != DTLS_ANY_VERSION) {
- SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_WRONG_VERSION_NUMBER);
- goto end;
- }
- if (!PACKET_forward(&msgpayload, SSL3_RANDOM_SIZE)
- || !PACKET_get_length_prefixed_1(&msgpayload, &session)
- || !PACKET_get_length_prefixed_1(&msgpayload, &cookiepkt)) {
-
- SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_LENGTH_MISMATCH);
- goto end;
- }
-
- if (PACKET_remaining(&cookiepkt) == 0) {
- next = LISTEN_SEND_VERIFY_REQUEST;
- } else {
-
- if (s->ctx->app_verify_cookie_cb == NULL) {
- SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_NO_VERIFY_COOKIE_CALLBACK);
-
- return -1;
- }
- if (s->ctx->app_verify_cookie_cb(s, PACKET_data(&cookiepkt),
- (unsigned int)PACKET_remaining(&cookiepkt)) == 0) {
-
- next = LISTEN_SEND_VERIFY_REQUEST;
- } else {
-
- next = LISTEN_SUCCESS;
- }
- }
- if (next == LISTEN_SEND_VERIFY_REQUEST) {
- WPACKET wpkt;
- unsigned int version;
- size_t wreclen;
-
-
- if (s->ctx->app_gen_cookie_cb == NULL ||
- s->ctx->app_gen_cookie_cb(s, cookie, &cookielen) == 0 ||
- cookielen > 255) {
- SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_COOKIE_GEN_CALLBACK_FAILURE);
-
- return -1;
- }
-
- version = (s->method->version == DTLS_ANY_VERSION) ? DTLS1_VERSION
- : s->version;
-
- if (!WPACKET_init_static_len(&wpkt,
- wbuf,
- ssl_get_max_send_fragment(s)
- + DTLS1_RT_HEADER_LENGTH,
- 0)
- || !WPACKET_put_bytes_u8(&wpkt, SSL3_RT_HANDSHAKE)
- || !WPACKET_put_bytes_u16(&wpkt, version)
-
- || !WPACKET_memcpy(&wpkt, seq, SEQ_NUM_SIZE)
-
- || !WPACKET_start_sub_packet_u16(&wpkt)
-
- || !WPACKET_put_bytes_u8(&wpkt,
- DTLS1_MT_HELLO_VERIFY_REQUEST)
-
- || !WPACKET_put_bytes_u24(&wpkt, 0)
-
- || !WPACKET_put_bytes_u16(&wpkt, 0)
-
- || !WPACKET_put_bytes_u24(&wpkt, 0)
-
- || !WPACKET_start_sub_packet_u24(&wpkt)
-
- || !dtls_raw_hello_verify_request(&wpkt, cookie, cookielen)
-
- || !WPACKET_close(&wpkt)
-
- || !WPACKET_close(&wpkt)
- || !WPACKET_get_total_written(&wpkt, &wreclen)
- || !WPACKET_finish(&wpkt)) {
- SSLerr(SSL_F_DTLSV1_LISTEN, ERR_R_INTERNAL_ERROR);
- WPACKET_cleanup(&wpkt);
-
- return -1;
- }
-
- memcpy(&wbuf[DTLS1_RT_HEADER_LENGTH + 1],
- &wbuf[DTLS1_RT_HEADER_LENGTH + DTLS1_HM_HEADER_LENGTH - 3],
- 3);
- if (s->msg_callback)
- s->msg_callback(1, 0, SSL3_RT_HEADER, buf,
- DTLS1_RT_HEADER_LENGTH, s, s->msg_callback_arg);
- if ((tmpclient = BIO_ADDR_new()) == NULL) {
- SSLerr(SSL_F_DTLSV1_LISTEN, ERR_R_MALLOC_FAILURE);
- goto end;
- }
-
- if (BIO_dgram_get_peer(rbio, tmpclient) > 0) {
- (void)BIO_dgram_set_peer(wbio, tmpclient);
- }
- BIO_ADDR_free(tmpclient);
- tmpclient = NULL;
-
- if (BIO_write(wbio, wbuf, wreclen) < (int)wreclen) {
- if (BIO_should_retry(wbio)) {
-
- goto end;
- }
- return -1;
- }
- if (BIO_flush(wbio) <= 0) {
- if (BIO_should_retry(wbio)) {
-
- goto end;
- }
- return -1;
- }
- }
- } while (next != LISTEN_SUCCESS);
-
- s->d1->handshake_read_seq = 1;
- s->d1->handshake_write_seq = 1;
- s->d1->next_handshake_write_seq = 1;
- DTLS_RECORD_LAYER_set_write_sequence(&s->rlayer, seq);
-
- SSL_set_options(s, SSL_OP_COOKIE_EXCHANGE);
-
- ossl_statem_set_hello_verify_done(s);
-
- if (BIO_dgram_get_peer(rbio, client) <= 0)
- BIO_ADDR_clear(client);
-
- if (!dtls_buffer_listen_record(s, reclen, seq, align))
- return -1;
- ret = 1;
- end:
- BIO_ADDR_free(tmpclient);
- return ret;
- }
- #endif
- static int dtls1_handshake_write(SSL *s)
- {
- return dtls1_do_write(s, SSL3_RT_HANDSHAKE);
- }
- int dtls1_shutdown(SSL *s)
- {
- int ret;
- #ifndef OPENSSL_NO_SCTP
- BIO *wbio;
- wbio = SSL_get_wbio(s);
- if (wbio != NULL && BIO_dgram_is_sctp(wbio) &&
- !(s->shutdown & SSL_SENT_SHUTDOWN)) {
- ret = BIO_dgram_sctp_wait_for_dry(wbio);
- if (ret < 0)
- return -1;
- if (ret == 0)
- BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SAVE_SHUTDOWN, 1,
- NULL);
- }
- #endif
- ret = ssl3_shutdown(s);
- #ifndef OPENSSL_NO_SCTP
- BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SAVE_SHUTDOWN, 0, NULL);
- #endif
- return ret;
- }
- int dtls1_query_mtu(SSL *s)
- {
- if (s->d1->link_mtu) {
- s->d1->mtu =
- s->d1->link_mtu - BIO_dgram_get_mtu_overhead(SSL_get_wbio(s));
- s->d1->link_mtu = 0;
- }
-
- if (s->d1->mtu < dtls1_min_mtu(s)) {
- if (!(SSL_get_options(s) & SSL_OP_NO_QUERY_MTU)) {
- s->d1->mtu =
- BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
-
- if (s->d1->mtu < dtls1_min_mtu(s)) {
-
- s->d1->mtu = dtls1_min_mtu(s);
- BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SET_MTU,
- (long)s->d1->mtu, NULL);
- }
- } else
- return 0;
- }
- return 1;
- }
- static size_t dtls1_link_min_mtu(void)
- {
- return (g_probable_mtu[(sizeof(g_probable_mtu) /
- sizeof(g_probable_mtu[0])) - 1]);
- }
- size_t dtls1_min_mtu(SSL *s)
- {
- return dtls1_link_min_mtu() - BIO_dgram_get_mtu_overhead(SSL_get_wbio(s));
- }
- size_t DTLS_get_data_mtu(const SSL *s)
- {
- size_t mac_overhead, int_overhead, blocksize, ext_overhead;
- const SSL_CIPHER *ciph = SSL_get_current_cipher(s);
- size_t mtu = s->d1->mtu;
- if (ciph == NULL)
- return 0;
- if (!ssl_cipher_get_overhead(ciph, &mac_overhead, &int_overhead,
- &blocksize, &ext_overhead))
- return 0;
- if (SSL_READ_ETM(s))
- ext_overhead += mac_overhead;
- else
- int_overhead += mac_overhead;
-
- if (ext_overhead + DTLS1_RT_HEADER_LENGTH >= mtu)
- return 0;
- mtu -= ext_overhead + DTLS1_RT_HEADER_LENGTH;
-
- if (blocksize)
- mtu -= (mtu % blocksize);
-
- if (int_overhead >= mtu)
- return 0;
- mtu -= int_overhead;
- return mtu;
- }
- void DTLS_set_timer_cb(SSL *s, DTLS_timer_cb cb)
- {
- s->d1->timer_cb = cb;
- }
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