FFmpeg: libavformat/srtpproto.c Source File

FFmpeg

libavformat

srtpproto.c

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1 /*

2 * SRTP network protocol

3 * Copyright (c) 2012 Martin Storsjo

4 *

5 * This file is part of FFmpeg.

6 *

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

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

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

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

11 *

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

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

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

15 * Lesser General Public License for more details.

16 *

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

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

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

20 */

21

22 #include "libavutil/opt.h"

23 #include "avformat.h"

24 #include "avio_internal.h"

25 #include "url.h"

26

27 #include "internal.h"

28 #include "rtpdec.h"

29 #include "srtp.h"

30

31 typedef struct SRTPProtoContext {

32 const AVClass *class;

33 URLContext *rtp_hd;

34 const char *out_suite, *out_params;

35 const char *in_suite, *in_params;

36 struct SRTPContext srtp_out, srtp_in;

37 uint8_t encryptbuf[RTP_MAX_PACKET_LENGTH];

38 } SRTPProtoContext;

39

40 #define D AV_OPT_FLAG_DECODING_PARAM

41 #define E AV_OPT_FLAG_ENCODING_PARAM

42 static const AVOption options[] = {

43 { "srtp_out_suite", "", offsetof(SRTPProtoContext, out_suite), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, E },

44 { "srtp_out_params", "", offsetof(SRTPProtoContext, out_params), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, E },

45 { "srtp_in_suite", "", offsetof(SRTPProtoContext, in_suite), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, D },

46 { "srtp_in_params", "", offsetof(SRTPProtoContext, in_params), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, D },

47 { NULL }

48 };

49

50 static const AVClass srtp_context_class = {

51 .class_name = "srtp",

52 .item_name = av_default_item_name,

53 .option = options,

54 .version = LIBAVUTIL_VERSION_INT,

55 };

56

57 static int srtp_close(URLContext *h)

58 {

59 SRTPProtoContext *s = h->priv_data;

60 ff_srtp_free(&s->srtp_out);

61 ff_srtp_free(&s->srtp_in);

62 ffurl_closep(&s->rtp_hd);

63 return 0;

64 }

65

66 static int srtp_open(URLContext *h, const char *uri, int flags)

67 {

68 SRTPProtoContext *s = h->priv_data;

69 char hostname[256], buf[1024], path[1024];

70 int rtp_port, ret;

71

72 if (s->out_suite && s->out_params)

73 if ((ret = ff_srtp_set_crypto(&s->srtp_out, s->out_suite, s->out_params)) < 0)

74 goto fail;

75 if (s->in_suite && s->in_params)

76 if ((ret = ff_srtp_set_crypto(&s->srtp_in, s->in_suite, s->in_params)) < 0)

77 goto fail;

78

79 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &rtp_port,

80 path, sizeof(path), uri);

81 ff_url_join(buf, sizeof(buf), "rtp", NULL, hostname, rtp_port, "%s", path);

82 if ((ret = ffurl_open_whitelist(&s->rtp_hd, buf, flags, &h->interrupt_callback,

83 NULL, h->protocol_whitelist, h->protocol_blacklist, h)) < 0)

84 goto fail;

85

86 h->max_packet_size = FFMIN(s->rtp_hd->max_packet_size,

87 sizeof(s->encryptbuf)) - 14;

88 h->is_streamed = 1;

89 return 0;

90

91 fail:

92 srtp_close(h);

93 return ret;

94 }

95

96 static int srtp_read(URLContext *h, uint8_t *buf, int size)

97 {

98 SRTPProtoContext *s = h->priv_data;

99 int ret;

100 start:

101 ret = ffurl_read(s->rtp_hd, buf, size);

102 if (ret > 0 && s->srtp_in.aes) {

103 if (ff_srtp_decrypt(&s->srtp_in, buf, &ret) < 0)

104 goto start;

105 }

106 return ret;

107 }

108

109 static int srtp_write(URLContext *h, const uint8_t *buf, int size)

110 {

111 SRTPProtoContext *s = h->priv_data;

112 if (!s->srtp_out.aes)

113 return ffurl_write(s->rtp_hd, buf, size);

114 size = ff_srtp_encrypt(&s->srtp_out, buf, size, s->encryptbuf,

115 sizeof(s->encryptbuf));

116 if (size < 0)

117 return size;

118 return ffurl_write(s->rtp_hd, s->encryptbuf, size);

119 }

120

121 static int srtp_get_file_handle(URLContext *h)

122 {

123 SRTPProtoContext *s = h->priv_data;

124 return ffurl_get_file_handle(s->rtp_hd);

125 }

126

127 static int srtp_get_multi_file_handle(URLContext *h, int **handles,

128 int *numhandles)

129 {

130 SRTPProtoContext *s = h->priv_data;

131 return ffurl_get_multi_file_handle(s->rtp_hd, handles, numhandles);

132 }

133

134 const URLProtocol ff_srtp_protocol = {

135 .name = "srtp",

136 .url_open = srtp_open,

137 .url_read = srtp_read,

138 .url_write = srtp_write,

139 .url_close = srtp_close,

140 .url_get_file_handle = srtp_get_file_handle,

141 .url_get_multi_file_handle = srtp_get_multi_file_handle,

142 .priv_data_size = sizeof(SRTPProtoContext),

143 .priv_data_class = &srtp_context_class,

144 .flags = URL_PROTOCOL_FLAG_NETWORK,

145 };

SRTPProtoContext::encryptbuf

uint8_t encryptbuf[RTP_MAX_PACKET_LENGTH]

Definition: srtpproto.c:37

URL_PROTOCOL_FLAG_NETWORK

#define URL_PROTOCOL_FLAG_NETWORK

Definition: url.h:34

srtp_get_file_handle

static int srtp_get_file_handle(URLContext *h)

Definition: srtpproto.c:121

E

#define E

Definition: srtpproto.c:41

AVOption.

Definition: opt.h:247

srtp_context_class

static const AVClass srtp_context_class

Definition: srtpproto.c:50

Definition: srtp.h:30

Definition: url.h:54

static int srtp_read(URLContext *h, uint8_t *buf, int size)

Definition: srtpproto.c:96

#define fail()

Definition: checkasm.h:127

ff_srtp_decrypt

int ff_srtp_decrypt(struct SRTPContext *s, uint8_t *buf, int *lenptr)

Definition: srtp.c:126

static int srtp_close(URLContext *h)

Definition: srtpproto.c:57

ff_srtp_encrypt

int ff_srtp_encrypt(struct SRTPContext *s, const uint8_t *in, int len, uint8_t *out, int outlen)

Definition: srtp.c:238

ffurl_open_whitelist

int ffurl_open_whitelist(URLContext **puc, const char *filename, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options, const char *whitelist, const char *blacklist, URLContext *parent)

Create an URLContext for accessing to the resource indicated by url, and open it.

Definition: avio.c:306

s

#define s(width, name)

Definition: cbs_vp9.c:257

SRTPProtoContext::out_params

const char * out_params

Definition: srtpproto.c:34

int ff_url_join(char *str, int size, const char *proto, const char *authorization, const char *hostname, int port, const char *fmt,...)

Definition: url.c:38

ff_srtp_protocol

const URLProtocol ff_srtp_protocol

Definition: srtpproto.c:134

LIBAVUTIL_VERSION_INT

#define LIBAVUTIL_VERSION_INT

Definition: version.h:85

Describe the class of an AVClass context structure.

Definition: log.h:66

#define NULL

Definition: coverity.c:32

SRTPProtoContext::out_suite

const char * out_suite

Definition: srtpproto.c:34

av_default_item_name

const char * av_default_item_name(void *ptr)

Return the context name.

Definition: log.c:235

D

#define D

Definition: srtpproto.c:40

ffurl_get_multi_file_handle

int ffurl_get_multi_file_handle(URLContext *h, int **handles, int *numhandles)

Return the file descriptors associated with this URL.

Definition: avio.c:627

int size

Definition: twinvq_data.h:10344

URLProtocol::name

const char * name

Definition: url.h:55

SRTPProtoContext::in_params

const char * in_params

Definition: srtpproto.c:35

srtp_get_multi_file_handle

static int srtp_get_multi_file_handle(URLContext *h, int **handles, int *numhandles)

Definition: srtpproto.c:127

void ff_srtp_free(struct SRTPContext *s)

Definition: srtp.c:31

static int srtp_write(URLContext *h, const uint8_t *buf, int size)

Definition: srtpproto.c:109

SRTPProtoContext::srtp_in

struct SRTPContext srtp_out srtp_in

Definition: srtpproto.c:36

Definition: url.h:38

avio_internal.h

SRTPProtoContext::rtp_hd

URLContext * rtp_hd

Definition: srtpproto.c:33

void av_url_split(char *proto, int proto_size, char *authorization, int authorization_size, char *hostname, int hostname_size, int *port_ptr, char *path, int path_size, const char *url)

Split a URL string into components.

Definition: utils.c:1050

#define FFMIN(a, b)

Definition: macros.h:49

ff_srtp_set_crypto

int ff_srtp_set_crypto(struct SRTPContext *s, const char *suite, const char *params)

Definition: srtp.c:65

int ffurl_closep(URLContext **hh)

Close the resource accessed by the URLContext h, and free the memory used by it.

Definition: avio.c:438

ret

Definition: filter_design.txt:187

AVClass::class_name

const char * class_name

The name of the class; usually it is the same name as the context structure type to which the AVClass...

Definition: log.h:71

SRTPProtoContext::in_suite

const char * in_suite

Definition: srtpproto.c:35

SRTPProtoContext

Definition: srtpproto.c:31

RTP_MAX_PACKET_LENGTH

#define RTP_MAX_PACKET_LENGTH

Definition: rtpdec.h:37

int ffurl_read(URLContext *h, unsigned char *buf, int size)

Read up to size bytes from the resource accessed by h, and store the read bytes in buf.

Definition: avio.c:401

static const AVOption options[]

Definition: srtpproto.c:42

int ffurl_write(URLContext *h, const unsigned char *buf, int size)

Write size bytes from buf to the resource accessed by h.

Definition: avio.c:415

static int srtp_open(URLContext *h, const char *uri, int flags)

Definition: srtpproto.c:66

#define flags(name, subs,...)

Definition: cbs_av1.c:561

h

h

Definition: vp9dsp_template.c:2038

AV_OPT_TYPE_STRING

@ AV_OPT_TYPE_STRING

Definition: opt.h:228

ffurl_get_file_handle

int ffurl_get_file_handle(URLContext *h)

Return the file descriptor associated with this URL.

Definition: avio.c:620

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