| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 "url.h" | ||
| 25 | |||
| 26 | #include "rtpdec.h" | ||
| 27 | #include "srtp.h" | ||
| 28 | |||
| 29 | typedef struct SRTPProtoContext { | ||
| 30 | const AVClass *class; | ||
| 31 | URLContext *rtp_hd; | ||
| 32 | const char *out_suite, *out_params; | ||
| 33 | const char *in_suite, *in_params; | ||
| 34 | struct SRTPContext srtp_out, srtp_in; | ||
| 35 | uint8_t encryptbuf[RTP_MAX_PACKET_LENGTH]; | ||
| 36 | } SRTPProtoContext; | ||
| 37 | |||
| 38 | #define D AV_OPT_FLAG_DECODING_PARAM | ||
| 39 | #define E AV_OPT_FLAG_ENCODING_PARAM | ||
| 40 | static const AVOption options[] = { | ||
| 41 | { "srtp_out_suite", "", offsetof(SRTPProtoContext, out_suite), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, E }, | ||
| 42 | { "srtp_out_params", "", offsetof(SRTPProtoContext, out_params), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, E }, | ||
| 43 | { "srtp_in_suite", "", offsetof(SRTPProtoContext, in_suite), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, D }, | ||
| 44 | { "srtp_in_params", "", offsetof(SRTPProtoContext, in_params), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, D }, | ||
| 45 | { NULL } | ||
| 46 | }; | ||
| 47 | |||
| 48 | static const AVClass srtp_context_class = { | ||
| 49 | .class_name = "srtp", | ||
| 50 | .item_name = av_default_item_name, | ||
| 51 | .option = options, | ||
| 52 | .version = LIBAVUTIL_VERSION_INT, | ||
| 53 | }; | ||
| 54 | |||
| 55 | ✗ | static int srtp_close(URLContext *h) | |
| 56 | { | ||
| 57 | ✗ | SRTPProtoContext *s = h->priv_data; | |
| 58 | ✗ | ff_srtp_free(&s->srtp_out); | |
| 59 | ✗ | ff_srtp_free(&s->srtp_in); | |
| 60 | ✗ | ffurl_closep(&s->rtp_hd); | |
| 61 | ✗ | return 0; | |
| 62 | } | ||
| 63 | |||
| 64 | ✗ | static int srtp_open(URLContext *h, const char *uri, int flags) | |
| 65 | { | ||
| 66 | ✗ | SRTPProtoContext *s = h->priv_data; | |
| 67 | char hostname[256], buf[1024], path[1024]; | ||
| 68 | int rtp_port, ret; | ||
| 69 | |||
| 70 | ✗ | if (s->out_suite && s->out_params) | |
| 71 | ✗ | if ((ret = ff_srtp_set_crypto(&s->srtp_out, s->out_suite, s->out_params)) < 0) | |
| 72 | ✗ | goto fail; | |
| 73 | ✗ | if (s->in_suite && s->in_params) | |
| 74 | ✗ | if ((ret = ff_srtp_set_crypto(&s->srtp_in, s->in_suite, s->in_params)) < 0) | |
| 75 | ✗ | goto fail; | |
| 76 | |||
| 77 | ✗ | av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &rtp_port, | |
| 78 | path, sizeof(path), uri); | ||
| 79 | ✗ | ff_url_join(buf, sizeof(buf), "rtp", NULL, hostname, rtp_port, "%s", path); | |
| 80 | ✗ | if ((ret = ffurl_open_whitelist(&s->rtp_hd, buf, flags, &h->interrupt_callback, | |
| 81 | NULL, h->protocol_whitelist, h->protocol_blacklist, h)) < 0) | ||
| 82 | ✗ | goto fail; | |
| 83 | |||
| 84 | ✗ | h->max_packet_size = FFMIN(s->rtp_hd->max_packet_size, | |
| 85 | ✗ | sizeof(s->encryptbuf)) - 14; | |
| 86 | ✗ | h->is_streamed = 1; | |
| 87 | ✗ | return 0; | |
| 88 | |||
| 89 | ✗ | fail: | |
| 90 | ✗ | srtp_close(h); | |
| 91 | ✗ | return ret; | |
| 92 | } | ||
| 93 | |||
| 94 | ✗ | static int srtp_read(URLContext *h, uint8_t *buf, int size) | |
| 95 | { | ||
| 96 | ✗ | SRTPProtoContext *s = h->priv_data; | |
| 97 | int ret; | ||
| 98 | ✗ | start: | |
| 99 | ✗ | ret = ffurl_read(s->rtp_hd, buf, size); | |
| 100 | ✗ | if (ret > 0 && s->srtp_in.aes) { | |
| 101 | ✗ | if (ff_srtp_decrypt(&s->srtp_in, buf, &ret) < 0) | |
| 102 | ✗ | goto start; | |
| 103 | } | ||
| 104 | ✗ | return ret; | |
| 105 | } | ||
| 106 | |||
| 107 | ✗ | static int srtp_write(URLContext *h, const uint8_t *buf, int size) | |
| 108 | { | ||
| 109 | ✗ | SRTPProtoContext *s = h->priv_data; | |
| 110 | ✗ | if (!s->srtp_out.aes) | |
| 111 | ✗ | return ffurl_write(s->rtp_hd, buf, size); | |
| 112 | ✗ | size = ff_srtp_encrypt(&s->srtp_out, buf, size, s->encryptbuf, | |
| 113 | sizeof(s->encryptbuf)); | ||
| 114 | ✗ | if (size < 0) | |
| 115 | ✗ | return size; | |
| 116 | ✗ | return ffurl_write(s->rtp_hd, s->encryptbuf, size); | |
| 117 | } | ||
| 118 | |||
| 119 | ✗ | static int srtp_get_file_handle(URLContext *h) | |
| 120 | { | ||
| 121 | ✗ | SRTPProtoContext *s = h->priv_data; | |
| 122 | ✗ | return ffurl_get_file_handle(s->rtp_hd); | |
| 123 | } | ||
| 124 | |||
| 125 | ✗ | static int srtp_get_multi_file_handle(URLContext *h, int **handles, | |
| 126 | int *numhandles) | ||
| 127 | { | ||
| 128 | ✗ | SRTPProtoContext *s = h->priv_data; | |
| 129 | ✗ | return ffurl_get_multi_file_handle(s->rtp_hd, handles, numhandles); | |
| 130 | } | ||
| 131 | |||
| 132 | const URLProtocol ff_srtp_protocol = { | ||
| 133 | .name = "srtp", | ||
| 134 | .url_open = srtp_open, | ||
| 135 | .url_read = srtp_read, | ||
| 136 | .url_write = srtp_write, | ||
| 137 | .url_close = srtp_close, | ||
| 138 | .url_get_file_handle = srtp_get_file_handle, | ||
| 139 | .url_get_multi_file_handle = srtp_get_multi_file_handle, | ||
| 140 | .priv_data_size = sizeof(SRTPProtoContext), | ||
| 141 | .priv_data_class = &srtp_context_class, | ||
| 142 | .flags = URL_PROTOCOL_FLAG_NETWORK, | ||
| 143 | }; | ||
| 144 |