@@ -281,6 +281,8 @@ External library support:

   --enable-opengl          enable OpenGL rendering [no]

   --enable-openssl         enable openssl, needed for https support

                            if gnutls is not used [no]

+  --disable-schannel       disable SChannel SSP, needed for TLS support on

+                           Windows if openssl and gnutls are not used [autodetect]

   --disable-sdl            disable sdl [autodetect]

   --disable-securetransport disable Secure Transport, needed for TLS support

                            on OSX if openssl and gnutls are not used [autodetect]

@@ -1468,6 +1470,7 @@ EXTERNAL_LIBRARY_LIST="

     opencl

     opengl

     openssl

+    schannel

     sdl

     securetransport

     x11grab

@@ -2763,13 +2766,15 @@ sctp_protocol_deps="struct_sctp_event_subscribe"

 sctp_protocol_select="network"

 srtp_protocol_select="rtp_protocol"

 tcp_protocol_select="network"

-tls_gnutls_protocol_deps="gnutls !tls_securetransport_protocol"

+tls_gnutls_protocol_deps="gnutls !tls_schannel_protocol !tls_securetransport_protocol"

 tls_gnutls_protocol_select="tcp_protocol"

-tls_openssl_protocol_deps="openssl !tls_securetransport_protocol !tls_gnutls_protocol"

+tls_openssl_protocol_deps="openssl !tls_schannel_protocol !tls_securetransport_protocol !tls_gnutls_protocol"

 tls_openssl_protocol_select="tcp_protocol"

+tls_schannel_protocol_deps="schannel"

+tls_schannel_protocol_select="tcp_protocol"

 tls_securetransport_protocol_deps="securetransport"

 tls_securetransport_protocol_select="tcp_protocol"

-tls_protocol_deps_any="tls_securetransport_protocol tls_gnutls_protocol tls_openssl_protocol"

+tls_protocol_deps_any="tls_schannel_protocol tls_securetransport_protocol tls_gnutls_protocol tls_openssl_protocol"

 udp_protocol_select="network"

 udplite_protocol_select="network"

 unix_protocol_deps="sys_un_h"

@@ -5511,6 +5516,9 @@ disabled securetransport || { check_func SecIdentityCreate "-Wl,-framework,CoreF

     check_lib2 "Security/SecureTransport.h Security/Security.h" "SSLCreateContext SecItemImport" "-Wl,-framework,CoreFoundation -Wl,-framework,Security" &&

     enable securetransport; }

+disabled schannel || { check_func_headers "windows.h Security.h" InitializeSecurityContext -DSECURITY_WIN32 -lSecur32 &&

+                       enable schannel && add_extralibs -lSecur32; }

+

 makeinfo --version > /dev/null 2>&1 && enable makeinfo  || disable makeinfo

 enabled makeinfo \

     && [ 0$(makeinfo --version | grep "texinfo" | sed 's/.*texinfo[^0-9]*\([0-9]*\)\..*/\1/') -ge 5 ] \

@@ -544,6 +544,7 @@ OBJS-$(CONFIG_SUBFILE_PROTOCOL)          += subfile.o

 OBJS-$(CONFIG_TCP_PROTOCOL)              += tcp.o

 OBJS-$(CONFIG_TLS_GNUTLS_PROTOCOL)       += tls_gnutls.o tls.o

 OBJS-$(CONFIG_TLS_OPENSSL_PROTOCOL)      += tls_openssl.o tls.o

+OBJS-$(CONFIG_TLS_SCHANNEL_PROTOCOL)     += tls_schannel.o tls.o

 OBJS-$(CONFIG_TLS_SECURETRANSPORT_PROTOCOL) += tls_securetransport.o tls.o

 OBJS-$(CONFIG_UDP_PROTOCOL)              += udp.o

 OBJS-$(CONFIG_UDPLITE_PROTOCOL)          += udp.o

@@ -395,6 +395,7 @@ void av_register_all(void)

     REGISTER_PROTOCOL(SRTP,             srtp);

     REGISTER_PROTOCOL(SUBFILE,          subfile);

     REGISTER_PROTOCOL(TCP,              tcp);

+    REGISTER_PROTOCOL(TLS_SCHANNEL,     tls_schannel);

     REGISTER_PROTOCOL(TLS_SECURETRANSPORT, tls_securetransport);

     REGISTER_PROTOCOL(TLS_GNUTLS,       tls_gnutls);

     REGISTER_PROTOCOL(TLS_OPENSSL,      tls_openssl);

@@ -26,7 +26,7 @@

 #include "url.h"

 #include "libavutil/opt.h"

-#define CONFIG_TLS_PROTOCOL (CONFIG_TLS_GNUTLS_PROTOCOL | CONFIG_TLS_OPENSSL_PROTOCOL | CONFIG_TLS_SECURETRANSPORT_PROTOCOL)

+#define CONFIG_TLS_PROTOCOL (CONFIG_TLS_GNUTLS_PROTOCOL | CONFIG_TLS_OPENSSL_PROTOCOL | CONFIG_TLS_SECURETRANSPORT_PROTOCOL | CONFIG_TLS_SCHANNEL_PROTOCOL)

 typedef struct TLSShared {

     char *ca_file;

new file mode 100644

@@ -0,0 +1,600 @@

+/*

+ * Copyright (c) 2015 Hendrik Leppkes

+ *

+ * This file is part of FFmpeg.

+ *

+ * FFmpeg is free software; you can redistribute it and/or

+ * modify it under the terms of the GNU Lesser General Public

+ * License as published by the Free Software Foundation; either

+ * version 2.1 of the License, or (at your option) any later version.

+ *

+ * FFmpeg is distributed in the hope that it will be useful,

+ * but WITHOUT ANY WARRANTY; without even the implied warranty of

+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

+ * Lesser General Public License for more details.

+ *

+ * You should have received a copy of the GNU Lesser General Public

+ * License along with FFmpeg; if not, write to the Free Software

+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

+ */

+

+/** Based on the CURL SChannel module */

+

+#include "avformat.h"

+#include "internal.h"

+#include "network.h"

+#include "os_support.h"

+#include "url.h"

+#include "tls.h"

+

+#define SECURITY_WIN32

+#include <security.h>

+#include <schnlsp.h>

+

+#define SCHANNEL_INITIAL_BUFFER_SIZE   4096

+#define SCHANNEL_FREE_BUFFER_SIZE      1024

+

+/* mingw does not define this symbol */

+#ifndef SECBUFFER_ALERT

+#define SECBUFFER_ALERT                17

+#endif

+

+typedef struct TLSContext {

+    const AVClass *class;

+    TLSShared tls_shared;

+

+    CredHandle cred_handle;

+    TimeStamp cred_timestamp;

+

+    CtxtHandle ctxt_handle;

+    TimeStamp ctxt_timestamp;

+

+    ULONG request_flags;

+    ULONG context_flags;

+

+    uint8_t *enc_buf;

+    int enc_buf_size;

+    int enc_buf_offset;

+

+    uint8_t *dec_buf;

+    int dec_buf_size;

+    int dec_buf_offset;

+

+    SecPkgContext_StreamSizes sizes;

+

+    int connected;

+    int connection_closed;

+    int sspi_close_notify;

+} TLSContext;

+

+static void init_sec_buffer(SecBuffer *buffer, unsigned long type,

+                            void *data, unsigned long size)

+{

+    buffer->cbBuffer   = size;

+    buffer->BufferType = type;

+    buffer->pvBuffer   = data;

+}

+

+static void init_sec_buffer_desc(SecBufferDesc *desc, SecBuffer *buffers,

+                                 unsigned long buffer_count)

+{

+    desc->ulVersion = SECBUFFER_VERSION;

+    desc->pBuffers = buffers;

+    desc->cBuffers = buffer_count;

+}

+

+static int tls_shutdown_client(URLContext *h)

+{

+    TLSContext *c = h->priv_data;

+    TLSShared *s = &c->tls_shared;

+    int ret;

+

+    if (c->connected) {

+        SecBufferDesc BuffDesc;

+        SecBuffer Buffer;

+        SECURITY_STATUS sspi_ret;

+        SecBuffer outbuf;

+        SecBufferDesc outbuf_desc;

+

+        DWORD dwshut = SCHANNEL_SHUTDOWN;

+        init_sec_buffer(&Buffer, SECBUFFER_TOKEN, &dwshut, sizeof(dwshut));

+        init_sec_buffer_desc(&BuffDesc, &Buffer, 1);

+

+        sspi_ret = ApplyControlToken(&c->ctxt_handle, &BuffDesc);

+        if (sspi_ret != SEC_E_OK)

+            av_log(h, AV_LOG_ERROR, "ApplyControlToken failed\n");

+

+        init_sec_buffer(&outbuf, SECBUFFER_EMPTY, NULL, 0);

+        init_sec_buffer_desc(&outbuf_desc, &outbuf, 1);

+

+        sspi_ret = InitializeSecurityContext(&c->cred_handle, &c->ctxt_handle, s->host,

+                                             c->request_flags, 0, 0, NULL, 0, &c->ctxt_handle,

+                                             &outbuf_desc, &c->context_flags, &c->ctxt_timestamp);

+        if (sspi_ret == SEC_E_OK || sspi_ret == SEC_I_CONTEXT_EXPIRED) {

+            ret = ffurl_write(s->tcp, outbuf.pvBuffer, outbuf.cbBuffer);

+            FreeContextBuffer(outbuf.pvBuffer);

+            if (ret < 0 || ret != outbuf.cbBuffer)

+                av_log(h, AV_LOG_ERROR, "Failed to send close message\n");

+        }

+

+        c->connected = 0;

+    }

+    return 0;

+}

+

+static int tls_close(URLContext *h)

+{

+    TLSContext *c = h->priv_data;

+

+    tls_shutdown_client(h);

+

+    DeleteSecurityContext(&c->ctxt_handle);

+    FreeCredentialsHandle(&c->cred_handle);

+

+    av_freep(&c->enc_buf);

+    c->enc_buf_size = c->enc_buf_offset = 0;

+

+    av_freep(&c->dec_buf);

+    c->dec_buf_size = c->dec_buf_offset = 0;

+

+    if (c->tls_shared.tcp)

+        ffurl_close(c->tls_shared.tcp);

+    return 0;

+}

+

+static int tls_client_handshake_loop(URLContext *h, int initial)

+{

+    TLSContext *c = h->priv_data;

+    TLSShared *s = &c->tls_shared;

+    SECURITY_STATUS sspi_ret;

+    SecBuffer outbuf[3];

+    SecBufferDesc outbuf_desc;

+    SecBuffer inbuf[2];

+    SecBufferDesc inbuf_desc;

+    int i, ret = 0, read_data = initial;

+

+    if (c->enc_buf == NULL) {

+        c->enc_buf_offset = 0;

+        ret = av_reallocp(&c->enc_buf, SCHANNEL_INITIAL_BUFFER_SIZE);

+        if (ret < 0)

+            goto fail;

+        c->enc_buf_size = SCHANNEL_INITIAL_BUFFER_SIZE;

+    }

+

+    if (c->dec_buf == NULL) {

+        c->dec_buf_offset = 0;

+        ret = av_reallocp(&c->dec_buf, SCHANNEL_INITIAL_BUFFER_SIZE);

+        if (ret < 0)

+            goto fail;

+        c->dec_buf_size = SCHANNEL_INITIAL_BUFFER_SIZE;

+    }

+

+    while (1) {

+        if (c->enc_buf_size - c->enc_buf_offset < SCHANNEL_FREE_BUFFER_SIZE) {

+            c->enc_buf_size = c->enc_buf_offset + SCHANNEL_FREE_BUFFER_SIZE;

+            ret = av_reallocp(&c->enc_buf, c->enc_buf_size);

+            if (ret < 0) {

+                c->enc_buf_size = c->enc_buf_offset = 0;

+                goto fail;

+            }

+        }

+

+        if (read_data) {

+            ret = ffurl_read(c->tls_shared.tcp, c->enc_buf + c->enc_buf_offset,

+                             c->enc_buf_size - c->enc_buf_offset);

+            if (ret < 0) {

+                av_log(h, AV_LOG_ERROR, "Failed to read handshake response\n");

+                goto fail;

+            }

+            c->enc_buf_offset += ret;

+        }

+

+        /* input buffers */

+        init_sec_buffer(&inbuf[0], SECBUFFER_TOKEN, av_malloc(c->enc_buf_offset), c->enc_buf_offset);

+        init_sec_buffer(&inbuf[1], SECBUFFER_EMPTY, NULL, 0);

+        init_sec_buffer_desc(&inbuf_desc, inbuf, 2);

+

+        if (inbuf[0].pvBuffer == NULL) {

+            av_log(h, AV_LOG_ERROR, "Failed to allocate input buffer\n");

+            ret = AVERROR(ENOMEM);

+            goto fail;

+        }

+

+        memcpy(inbuf[0].pvBuffer, c->enc_buf, c->enc_buf_offset);

+

+        /* output buffers */

+        init_sec_buffer(&outbuf[0], SECBUFFER_TOKEN, NULL, 0);

+        init_sec_buffer(&outbuf[1], SECBUFFER_ALERT, NULL, 0);

+        init_sec_buffer(&outbuf[2], SECBUFFER_EMPTY, NULL, 0);

+        init_sec_buffer_desc(&outbuf_desc, outbuf, 3);

+

+        sspi_ret = InitializeSecurityContext(&c->cred_handle, &c->ctxt_handle, s->host, c->request_flags,

+                                             0, 0, &inbuf_desc, 0, NULL, &outbuf_desc, &c->context_flags,

+                                             &c->ctxt_timestamp);

+        av_freep(&inbuf[0].pvBuffer);

+

+        if (sspi_ret == SEC_E_INCOMPLETE_MESSAGE) {

+            av_log(h, AV_LOG_DEBUG, "Received incomplete handshake, need more data\n");

+            read_data = 1;

+            continue;

+        }

+

+        /* remote requests a client certificate - attempt to continue without one anyway */

+        if (sspi_ret == SEC_I_INCOMPLETE_CREDENTIALS &&

+            !(c->request_flags & ISC_REQ_USE_SUPPLIED_CREDS)) {

+            av_log(h, AV_LOG_VERBOSE, "Client certificate has been requested, ignoring\n");

+            c->request_flags |= ISC_REQ_USE_SUPPLIED_CREDS;

+            read_data = 0;

+            continue;

+        }

+

+        /* continue handshake */

+        if (sspi_ret == SEC_I_CONTINUE_NEEDED || sspi_ret == SEC_E_OK) {

+            for (i = 0; i < 3; i++) {

+                if (outbuf[i].BufferType == SECBUFFER_TOKEN && outbuf[i].cbBuffer > 0) {

+                    ret = ffurl_write(c->tls_shared.tcp, outbuf[i].pvBuffer, outbuf[i].cbBuffer);

+                    if (ret < 0 || ret != outbuf[i].cbBuffer) {

+                        av_log(h, AV_LOG_VERBOSE, "Failed to send handshake data\n");

+                        ret = AVERROR(EIO);

+                        goto fail;

+                    }

+                }

+

+                if (outbuf[i].pvBuffer != NULL) {

+                    FreeContextBuffer(outbuf[i].pvBuffer);

+                    outbuf[i].pvBuffer = NULL;

+                }

+            }

+        } else {

+            if (sspi_ret == SEC_E_WRONG_PRINCIPAL)

+                av_log(h, AV_LOG_ERROR, "SNI or certificate check failed\n");

+            else

+                av_log(h, AV_LOG_ERROR, "Creating security context failed (0x%lx)\n", sspi_ret);

+            ret = AVERROR_UNKNOWN;

+            goto fail;

+        }

+

+        if (inbuf[1].BufferType == SECBUFFER_EXTRA && inbuf[1].cbBuffer > 0) {

+            if (c->enc_buf_offset > inbuf[1].cbBuffer) {

+                memmove(c->enc_buf, (c->enc_buf + c->enc_buf_offset) - inbuf[1].cbBuffer,

+                        inbuf[1].cbBuffer);

+                c->enc_buf_offset = inbuf[1].cbBuffer;

+                if (sspi_ret == SEC_I_CONTINUE_NEEDED) {

+                    read_data = 0;

+                    continue;

+                }

+            }

+        } else {

+            c->enc_buf_offset  = 0;

+        }

+

+        if (sspi_ret == SEC_I_CONTINUE_NEEDED) {

+            read_data = 1;

+            continue;

+        }

+

+        break;

+    }

+

+    return 0;

+

+fail:

+    /* free any remaining output data */

+    for (i = 0; i < 3; i++) {

+        if (outbuf[i].pvBuffer != NULL) {

+            FreeContextBuffer(outbuf[i].pvBuffer);

+            outbuf[i].pvBuffer = NULL;

+        }

+    }

+

+    return ret;

+}

+

+static int tls_client_handshake(URLContext *h)

+{

+    TLSContext *c = h->priv_data;

+    TLSShared *s = &c->tls_shared;

+    SecBuffer outbuf;

+    SecBufferDesc outbuf_desc;

+    SECURITY_STATUS sspi_ret;

+    int ret;

+

+    init_sec_buffer(&outbuf, SECBUFFER_EMPTY, NULL, 0);

+    init_sec_buffer_desc(&outbuf_desc, &outbuf, 1);

+

+    c->request_flags = ISC_REQ_SEQUENCE_DETECT | ISC_REQ_REPLAY_DETECT |

+                       ISC_REQ_CONFIDENTIALITY | ISC_REQ_ALLOCATE_MEMORY |

+                       ISC_REQ_STREAM;

+

+    sspi_ret = InitializeSecurityContext(&c->cred_handle, NULL, s->host, c->request_flags, 0, 0,

+                                         NULL, 0, &c->ctxt_handle, &outbuf_desc, &c->context_flags,

+                                         &c->ctxt_timestamp);

+    if (sspi_ret != SEC_I_CONTINUE_NEEDED) {

+        av_log(h, AV_LOG_ERROR, "Unable to create initial security context (0x%lx)\n", sspi_ret);

+        ret = AVERROR_UNKNOWN;

+        goto fail;

+    }

+

+    ret = ffurl_write(s->tcp, outbuf.pvBuffer, outbuf.cbBuffer);

+    FreeContextBuffer(outbuf.pvBuffer);

+    if (ret < 0 || ret != outbuf.cbBuffer) {

+        av_log(h, AV_LOG_ERROR, "Failed to send initial handshake data\n");

+        ret = AVERROR(EIO);

+        goto fail;

+    }

+

+    return tls_client_handshake_loop(h, 1);

+

+fail:

+    DeleteSecurityContext(&c->ctxt_handle);

+    return ret;

+}

+

+static int tls_open(URLContext *h, const char *uri, int flags, AVDictionary **options)

+{

+    TLSContext *c = h->priv_data;

+    TLSShared *s = &c->tls_shared;

+    SECURITY_STATUS sspi_ret;

+    SCHANNEL_CRED schannel_cred = { 0 };

+    int ret;

+

+    if ((ret = ff_tls_open_underlying(s, h, uri, options)) < 0)

+        goto fail;

+

+    if (s->listen) {

+        av_log(h, AV_LOG_ERROR, "TLS Listen Sockets with SChannel is not implemented.\n");

+        ret = AVERROR(EINVAL);

+        goto fail;

+    }

+

+    /* SChannel Options */

+    schannel_cred.dwVersion = SCHANNEL_CRED_VERSION;

+

+    if (s->verify)

+        schannel_cred.dwFlags = SCH_CRED_AUTO_CRED_VALIDATION |

+                                SCH_CRED_REVOCATION_CHECK_CHAIN;

+    else

+        schannel_cred.dwFlags = SCH_CRED_MANUAL_CRED_VALIDATION |

+                                SCH_CRED_IGNORE_NO_REVOCATION_CHECK |

+                                SCH_CRED_IGNORE_REVOCATION_OFFLINE;

+

+    /* Get credential handle */

+    sspi_ret = AcquireCredentialsHandle(NULL, (TCHAR *)UNISP_NAME, SECPKG_CRED_OUTBOUND,

+                                        NULL,  &schannel_cred, NULL, NULL, &c->cred_handle,

+                                        &c->cred_timestamp);

+    if (sspi_ret != SEC_E_OK) {

+        av_log(h, AV_LOG_ERROR, "Unable to acquire security credentials (0x%lx)\n", sspi_ret);

+        ret = AVERROR_UNKNOWN;

+        goto fail;

+    }

+

+    ret = tls_client_handshake(h);

+    if (ret < 0)

+        goto fail;

+

+    c->connected = 1;

+

+    return 0;

+

+fail:

+    tls_close(h);

+    return ret;

+}

+

+static int tls_read(URLContext *h, uint8_t *buf, int len)

+{

+    TLSContext *c = h->priv_data;

+    TLSShared *s = &c->tls_shared;

+    SECURITY_STATUS sspi_ret = SEC_E_OK;

+    SecBuffer inbuf[4];

+    SecBufferDesc inbuf_desc;

+    int size, ret;

+    int min_enc_buf_size = len + SCHANNEL_FREE_BUFFER_SIZE;

+

+    if (len <= c->dec_buf_offset)

+        goto cleanup;

+

+    if (c->sspi_close_notify)

+        goto cleanup;

+

+    if (!c->connection_closed) {

+        size = c->enc_buf_size - c->enc_buf_offset;

+        if (size < SCHANNEL_FREE_BUFFER_SIZE || c->enc_buf_size < min_enc_buf_size) {

+            c->enc_buf_size = c->enc_buf_offset + SCHANNEL_FREE_BUFFER_SIZE;

+            if (c->enc_buf_size < min_enc_buf_size)

+                c->enc_buf_size = min_enc_buf_size;

+            ret = av_reallocp(&c->enc_buf, c->enc_buf_size);

+            if (ret < 0) {

+                c->enc_buf_size = c->enc_buf_offset = 0;

+                return ret;

+            }

+        }

+

+        ret = ffurl_read(s->tcp, c->enc_buf + c->enc_buf_offset,

+                         c->enc_buf_size - c->enc_buf_offset);

+        if (ret < 0) {

+            av_log(h, AV_LOG_ERROR, "Unable to read from socket\n");

+            return ret;

+        } else if (ret == 0)

+            c->connection_closed = 1;

+

+        c->enc_buf_offset += ret;

+    }

+

+    while (c->enc_buf_offset > 0 && sspi_ret == SEC_E_OK && c->dec_buf_offset < len) {

+        /*  input buffer */

+        init_sec_buffer(&inbuf[0], SECBUFFER_DATA, c->enc_buf, c->enc_buf_offset);

+

+        /* additional buffers for possible output */

+        init_sec_buffer(&inbuf[1], SECBUFFER_EMPTY, NULL, 0);

+        init_sec_buffer(&inbuf[2], SECBUFFER_EMPTY, NULL, 0);

+        init_sec_buffer(&inbuf[3], SECBUFFER_EMPTY, NULL, 0);

+        init_sec_buffer_desc(&inbuf_desc, inbuf, 4);

+

+        sspi_ret = DecryptMessage(&c->ctxt_handle, &inbuf_desc, 0, NULL);

+        if (sspi_ret == SEC_E_OK || sspi_ret == SEC_I_RENEGOTIATE ||

+            sspi_ret == SEC_I_CONTEXT_EXPIRED) {

+            /* handle decrypted data */

+            if (inbuf[1].BufferType == SECBUFFER_DATA) {

+                /* grow buffer if needed */

+                size = inbuf[1].cbBuffer > SCHANNEL_FREE_BUFFER_SIZE ?

+                       inbuf[1].cbBuffer : SCHANNEL_FREE_BUFFER_SIZE;

+                if (c->dec_buf_size - c->dec_buf_offset < size || c->dec_buf_size < len)  {

+                    c->dec_buf_size = c->dec_buf_offset + size;

+                    if (c->dec_buf_size < len)

+                        c->dec_buf_size = len;

+                    ret = av_reallocp(&c->dec_buf, c->dec_buf_size);

+                    if (ret < 0) {

+                        c->dec_buf_size = c->dec_buf_offset = 0;

+                        return ret;

+                    }

+                }

+

+                /* copy decrypted data to buffer */

+                size = inbuf[1].cbBuffer;

+                if (size) {

+                    memcpy(c->dec_buf + c->dec_buf_offset, inbuf[1].pvBuffer, size);

+                    c->dec_buf_offset += size;

+                }

+            }

+            if (inbuf[3].BufferType == SECBUFFER_EXTRA && inbuf[3].cbBuffer > 0) {

+                if (c->enc_buf_offset > inbuf[3].cbBuffer) {

+                    memmove(c->enc_buf, (c->enc_buf + c->enc_buf_offset) - inbuf[3].cbBuffer,

+                    inbuf[3].cbBuffer);

+                    c->enc_buf_offset = inbuf[3].cbBuffer;

+                }

+            } else

+                c->enc_buf_offset = 0;

+

+            if (sspi_ret == SEC_I_RENEGOTIATE) {

+                if (c->enc_buf_offset) {

+                    av_log(h, AV_LOG_ERROR, "Cannot renegotiate, encrypted data buffer not empty\n");

+                    ret = AVERROR_UNKNOWN;

+                    goto cleanup;

+                }

+

+                av_log(h, AV_LOG_VERBOSE, "Re-negotiating security context\n");

+                ret = tls_client_handshake_loop(h, 0);

+                if (ret < 0) {

+                    goto cleanup;

+                }

+                sspi_ret = SEC_E_OK;

+                continue;

+            } else if (sspi_ret == SEC_I_CONTEXT_EXPIRED) {

+                c->sspi_close_notify = 1;

+                if (!c->connection_closed) {

+                    c->connection_closed = 1;

+                    av_log(h, AV_LOG_VERBOSE, "Server closed the connection\n");

+                }

+                ret = 0;

+                goto cleanup;

+            }

+        } else if (sspi_ret == SEC_E_INCOMPLETE_MESSAGE) {

+            ret = AVERROR(EAGAIN);

+            goto cleanup;

+        } else {

+            av_log(h, AV_LOG_ERROR, "Unable to decrypt message\n");

+            ret = AVERROR(EIO);

+            goto cleanup;

+        }

+    }

+

+    ret = 0;

+

+cleanup:

+    size = FFMIN(len, c->dec_buf_offset);

+    if (size) {

+        memcpy(buf, c->dec_buf, size);

+        memmove(c->dec_buf, c->dec_buf + size, c->dec_buf_offset - size);

+        c->dec_buf_offset -= size;

+

+        return size;

+    }

+

+    if (ret == 0 && !c->connection_closed)

+        ret = AVERROR(EAGAIN);

+

+    return ret < 0 ? ret : 0;

+}

+

+static int tls_write(URLContext *h, const uint8_t *buf, int len)

+{

+    TLSContext *c = h->priv_data;

+    TLSShared *s = &c->tls_shared;

+    SECURITY_STATUS sspi_ret;

+    int ret = 0, data_size;

+    uint8_t *data = NULL;

+    SecBuffer outbuf[4];

+    SecBufferDesc outbuf_desc;

+

+    if (c->sizes.cbMaximumMessage == 0) {

+        sspi_ret = QueryContextAttributes(&c->ctxt_handle, SECPKG_ATTR_STREAM_SIZES, &c->sizes);

+        if (sspi_ret != SEC_E_OK)

+            return AVERROR_UNKNOWN;

+    }

+

+    /* limit how much data we can consume */

+    len = FFMIN(len, c->sizes.cbMaximumMessage);

+

+    data_size = c->sizes.cbHeader + len + c->sizes.cbTrailer;

+    data = av_malloc(data_size);

+    if (data == NULL)

+        return AVERROR(ENOMEM);

+

+    init_sec_buffer(&outbuf[0], SECBUFFER_STREAM_HEADER,

+                  data, c->sizes.cbHeader);

+    init_sec_buffer(&outbuf[1], SECBUFFER_DATA,

+                  data + c->sizes.cbHeader, len);

+    init_sec_buffer(&outbuf[2], SECBUFFER_STREAM_TRAILER,

+                  data + c->sizes.cbHeader + len,

+                  c->sizes.cbTrailer);

+    init_sec_buffer(&outbuf[3], SECBUFFER_EMPTY, NULL, 0);

+    init_sec_buffer_desc(&outbuf_desc, outbuf, 4);

+

+    memcpy(outbuf[1].pvBuffer, buf, len);

+

+    sspi_ret = EncryptMessage(&c->ctxt_handle, 0, &outbuf_desc, 0);

+    if (sspi_ret == SEC_E_OK)  {

+        len = outbuf[0].cbBuffer + outbuf[1].cbBuffer + outbuf[2].cbBuffer;

+        ret = ffurl_write(s->tcp, data, len);

+        if (ret < 0 || ret != len) {

+            ret = AVERROR(EIO);

+            av_log(h, AV_LOG_ERROR, "Writing encrypted data to socket failed\n");

+            goto done;

+        }

+    } else {

+        av_log(h, AV_LOG_ERROR, "Encrypting data failed\n");

+        if (sspi_ret == SEC_E_INSUFFICIENT_MEMORY)

+            ret = AVERROR(ENOMEM);

+        else

+            ret = AVERROR(EIO);

+        goto done;

+    }

+

+done:

+    av_freep(&data);

+    return ret < 0 ? ret : outbuf[1].cbBuffer;

+}

+

+static const AVOption options[] = {

+    TLS_COMMON_OPTIONS(TLSContext, tls_shared),

+    { NULL }

+};

+

+static const AVClass tls_class = {

+    .class_name = "tls",

+    .item_name  = av_default_item_name,

+    .option     = options,

+    .version    = LIBAVUTIL_VERSION_INT,

+};

+

+URLProtocol ff_tls_schannel_protocol = {

+    .name           = "tls",

+    .url_open2      = tls_open,

+    .url_read       = tls_read,

+    .url_write      = tls_write,

+    .url_close      = tls_close,

+    .priv_data_size = sizeof(TLSContext),

+    .flags          = URL_PROTOCOL_FLAG_NETWORK,

+    .priv_data_class = &tls_class,

+};