\ud83d\udc49\ud83c\udffb \uc544\ub798\ub294 RTMP \ud578\ub4dc \uc170\uc774\ud06c\uc5d0 \ub300\ud55c \uc124\uba85\uc785\ub2c8\ub2e4.
Below is an explanation of the RTMP handshake.<\/p>\n\n\n\n
\ud83d\udc49\ud83c\udffbRTMP \uc804\uccb4 \ud750\ub984 \/ RTMP full flow , RTMP\ud578\ub4dc \uc170\uc774\ud06c \/ RTMP Handshake<\/p>\n\n\n\n
\ud83d\udc49\ud83c\udffb1.TCP \uc5f0\uacb0 \/ TCP connection<\/p>\n\n\n\n
# 1935 \uc5f0\uacb0 \/ 1935 connection,rtmp_server.cpp\nvoid RtmpServer::do_accept() {}<\/code><\/pre>\n\n\n\n\ud83d\udc49\ud83c\udffb2.RTMP \ud578\ub4dc \uc170\uc774\ud06c \/ RTMP Handshake<\/p>\n\n\n\n
\u2714\ufe0f RTMP\ub294 Adobe\uac00 \ub9cc\ub4e0 \ud504\ub85c\ud1a0\ucf5c\ub85c C0C1 \u2192 S0S1S2 \u2192 C2 \uc21c\uc11c\ub97c \ubb34\uc870\uac74 \uc9c0\ucf1c\uc57c\ud569\ub2c8\ub2e4.<\/p>\n\n\n\n
\u2714\ufe0f \uc11c\ubc84\uc640 \ud074\ub77c\uc774\uc5b8\ud2b8 \uac04\uc758 \ud1b5\uc2e0\uc774 RTMP \ud504\ub85c\ud1a0\ucf5c\uc774 \ub9de\ub294\uc9c0 \ud655\uc778\ud558\uae30 \uc704\ud574\uc11c \ud578\ub4dc\uc170\uc774\ud06c \uacfc\uc815 \uc2e4\ud589\ud569\ub2c8\ub2e4.
The handshake process is executed to verify that the communication between the server and the client uses the RTMP protocol.<\/p>\n\n\n\n
# OBS -> Server\nvoid RtmpSession::do_handshake_c0c1() {}\nvoid RtmpSession::do_handshake_s0s1s2() {}\nvoid RtmpSession::do_handshake_c2() {}<\/code><\/pre>\n\n\n\n\u2714\ufe0f void RtmpSession::do_handshake_c0c1(){}<\/p>\n\n\n\n
— \ud578\ub4dc\uc170\uc774\ud06c 1\ub2e8\uacc4\uc785\ub2c8\ub2e4. \/ This is step 1 of the handshake.<\/p>\n\n\n\n
— OBS\uac00 \ubcf4\ub0b8 C0+C1 \ubc1b\ub294 \ud568\uc218 \uc785\ub2c8\ub2e4.
This is a function that receives C0+C1 sent by OBS.<\/p>\n\n\n\n
— asio::async_read(socket_, asio::buffer(c0c1_, 1537) : <\/p>\n\n\n\n
1)RTMP \uaddc\uaca9 \/ RTMP standard:<\/p>\n\n\n\n
\n- C0: 1\ubc14\uc774\ud2b8 = RTMP \ubc84\uc804. \ud56d\uc0c1
0x03<\/code>(16\uc9c4\uc218,10\uc9c4\uc218\ub85c\ub294 3)
C0: 1 byte = RTMP version. Always 0x03 (hexadecimal, 3 in decimal)<\/li>\n\n\n\n- <\/li>\n\n\n\n
- C1: 1536\ubc14\uc774\ud2b8 = time, zero, random \ub370\uc774\ud130<\/li>\n\n\n\n
- C1: 1536 bytes = time, zero, random data<\/li>\n<\/ul>\n\n\n\n
2)C0 + C1 = 1537 byte<\/p>\n\n\n\n
3)\ubc84\uc804\uccb4\ud06c \uc131\uacf5\ud558\uba74 do_handshake_s0s1s2(); \uc2e4\ud589
If the version check is successful, execute do_handshake_s0s1s2();<\/p>\n\n\n\n
void RtmpSession::do_handshake_c0c1() {\n\n \/\/ RtmpSession\uc815\ubcf4 \ubcf5\uc0ac\n \/\/ Copy RtmpSession information\n \/\/\n \/\/ auto self = shared_from_this();\n \/\/ auto self = shared_from_this();\n \/\/\n \/\/ \uc544\ub798\ub294 shared_ptr \uac1d\uccb4\ub97c \ud558\ub098\ub354 \ub9cc\ub4e6\n \/\/ The following creates another shared_ptr object\n auto self(shared_from_this());\n\n \/\/ OBS\uac00 \ubcf4\ub0b8 C0+C1 1537\ubc14\uc774\ud2b8\ub97c c0c1_ \ubc30\uc5f4\uc5d0 \uc800\uc7a5\n \/\/ Store the 1537 bytes of C0+C1 sent by OBS in the c0c1_ array\n asio::async_read(socket_, asio::buffer(c0c1_, 1537),\n [this, self](std::error_code ec, std::size_t) {\n \/\/ \ud504\ub85c\ud1a0\ucf5c \ubc84\uc804 \uccb4\ud06c \/ Check protocol version\n if (ec || c0c1_[0]!= 0x03) return;\n std::cout << \"[Handshake] C0C1 received\\n\";\n do_handshake_s0s1s2();\n });\n}<\/code><\/pre>\n\n\n\n\u2714\ufe0f void RtmpSession::do_handshake_s0s1s2(){}<\/p>\n\n\n\n
— \ud578\ub4dc\uc170\uc774\ud06c 2\ub2e8\uacc4\uc785\ub2c8\ub2e4.
This is step 2 of the handshake.<\/p>\n\n\n\n
— OBS\uc5d0\uc11c \ubc1b\uc740 \uc815\ubcf4\ub97c \uc11c\ubc84\uc815\ubcf4\uc640 \ucde8\ud569\ud574\uc11c \ub2e4\uc2dc OBS\uc5d0\uac8c \ub3cc\ub824 \uc90d\ub2c8\ub2e4.
It combines the information received from OBS with server information and returns it to OBS.<\/p>\n\n\n\n
— 3073\ubc14\uc774\ud2b8\ub97c OBS\uc5d0 \uc804\uc1a1\ud558\uace0\ub098\uc11c do_handshake_c2();\ub97c \uc2e4\ud589\ud569\ub2c8\ub2e4.
After sending 3073 bytes to OBS, execute do_handshake_c2();.<\/p>\n\n\n\n\uc601\uc5ed\/Area<\/td> \ud06c\uae30\/Size<\/td> \uc778\ub371\uc2a4\/Index<\/td> \ub0b4\uc6a9\/Detail<\/td> \ucf54\ub4dc\/Code<\/td><\/tr> S0<\/td> 1byte<\/td> [0]<\/td> Version 0x03<\/code><\/td>s0s1s2_[0] = 0x03<\/td><\/tr> S1<\/td> 1536byte<\/td> [1\u223c1536]<\/td> \uc11c\ubc84 \ub370\uc774\ud130\/Server data<\/td> <\/td><\/tr> S1:time<\/td> 4byte<\/td> [1\u223c4]<\/td> \uc11c\ubc84 \ud604\uc7ac\uc2dc\uac04\/Server Current time<\/td> memcpy(&s0s1s2_[1], &time, 4)<\/td><\/tr> S1:zero<\/td> 4byte<\/td> [5\u223c8]<\/td> 0\uc73c\ub85c \ucc44\uc6c0 \/ Fill with zeros<\/td> memset(&s0s1s2_[5], 0, 4)<\/td><\/tr> S1:random<\/td> 1528byte<\/td> [9\u223c1536]<\/td> \ub79c\ub364\uac12 \/ Random value<\/td> RAND_bytes(&s0s1s2_[9], 1528)<\/td><\/tr> S2<\/td> 1536byte<\/td> [1537\u223c3072]<\/td> C1 \ubcf5\uc0ac\ubcf8 \/ C1 copy<\/td> memcpy(&s0s1s2_[1537], &c0c1_[1], 1536)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n\/\/ \uc11c\ubc84 \u2192 OBS\ub85c S0+S1+S2 3073\ubc14\uc774\ud2b8 \ubcf4\ub0b4\ub294 \ud578\ub4dc\uc170\uc774\ud06c 2\ub2e8\uacc4\n\/\/ Handshake Step 2: Sending 3073 bytes (S0+S1+S2) from Server to OBS\nvoid RtmpSession::do_handshake_s0s1s2() {\n \/\/ \uc138\uc158 \uc815\ubcf4 \uc720\uc9c0 \/ Maintain session information\n auto self(shared_from_this());\n s0s1s2_[0] = 0x03; \/\/ \uc11c\ubc84\ubc84\uc804 03 \/ Server version 03\n\n \/\/ \ud604\uc7ac\uc2dc\uac04 \ube45\uc5d4\ub514\uc548 \ubcc0\ud658,\ub124\ud2b8\uc6cc\ud06c \ubc14\uc774\ud2b8 \uc21c\uc11c = \ube45\uc5d4\ub514\uc548 \ubcc0\ud658,OBS\uac00 RTT \uacc4\uc0b0\ud560 \ub54c \uc500.\n \/\/ Current time converted to Big Endian, Network Byte Order = Big Endian conversion,\n \/\/ used by OBS when calculating RTT.\n uint32_t time = htonl(static_cast<uint32_t>(::time(nullptr)));\n\n \/\/ S1 \uccab 4\ubc14\uc774\ud2b8\uc5d0 \uc11c\ubc84 \ud604\uc7ac\uc2dc\uac04 \ub123\uc74c.\n \/\/ Insert server current time into the first 4 bytes of S1.\n std::memcpy(&s0s1s2_[1], &time, 4);\n\n \/\/ S1 4\u223c7\ubc14\uc774\ud2b8\ub294 \uaddc\uaca9\uc0c1 0\uc73c\ub85c \ucc44\uc6cc\uc57c \ud568.\n \/\/ S1 bytes 4~7 must be filled with zeros according to the standard.\n std::memset(&s0s1s2_[5], 0, 4);\n\n \/\/ OpenSSL\ub85c \ub79c\ub364\uac12 \ucc44\uc6c0(RTMPE\uba74 \uacf5\uac1c \ud0a4 \uc5ed\ud560)\n \/\/ Fill with random values \u200b\u200busing OpenSSL (acts as public key if RTMPE)\n RAND_bytes(&s0s1s2_[9], 1528);\n\n \/\/ &s0s1s2_[1537]\uc5d0 &c0c1_[1] \uc815\ubcf4\ub97c 1536\ubc14\uc774\ud2b8\ub9cc\ud07c \ubcf5\uc0ac\n \/\/ Copy 1536 bytes of &c0c1_[1] information to &s0s1s2_[1537]\n \/\/\n \/\/ 1537 = S0+S1\uc774 1537\ubc14\uc774\ud2b8\n\n \/\/ 1537 = S0+S1 is 1537 bytes\n std::memcpy(&s0s1s2_[1537], &c0c1_[1], 1536);\n\n \/\/ \uc804\uccb4 3073\ubc14\uc774\ud2b8\ub97c OBS\ub85c \uc804\uc1a1\n \/\/ Send the entire 3073 bytes to OBS\n asio::async_write(socket_, asio::buffer(s0s1s2_, 3073),\n [this, self](std::error_code ec, std::size_t) {\n if (ec) return;\n std::cout << \"[Handshake] S0S1S2 sent\\n\";\n do_handshake_c2();\n });\n}<\/code><\/pre>\n\n\n\n\u2714\ufe0f void RtmpSession::do_handshake_c2() {}<\/p>\n\n\n\n
— \ud578\ub4dc\uc170\uc774\ud06c 3\ub2e8\uacc4\uc785\ub2c8\ub2e4.
This is step 3 of the handshake.<\/p>\n\n\n\n
— OBS\ub85c \ubd80\ud130 \ub450\ubc88\uc9f8\ub85c(C2) 1536\ubc14\uc774\ud2b8\ub97c \ubc1b\uc2b5\ub2c8\ub2e4.
Receive 1536 bytes for the second (C2) from OBS.<\/p>\n\n\n\n
— \uc644\uc804\ud788 \ub2e4 \ubc1b\uc73c\uba74 send_protocol_messages(); \ud568\uc218\ub97c \uc2e4\ud589\ud569\ub2c8\ub2e4.
Once everything is fully received, the send_protocol_messages(); function is executed.<\/p>\n","protected":false},"excerpt":{"rendered":"
\ud83d\udc49\ud83c\udffb \uc544\ub798\ub294 RTMP \ud578\ub4dc \uc170\uc774\ud06c\uc5d0 \ub300\ud55c \uc124\uba85\uc785\ub2c8\ub2e4.Below is an explanation of the RTMP handshake. \ud83d\udc49\ud83c\udffbRTMP \uc804\uccb4 \ud750\ub984 \/ RTMP full flow , RTMP\ud578\ub4dc \uc170\uc774\ud06c \/ RTMP Handshake \ud83d\udc49\ud83c\udffb1.TCP \uc5f0\uacb0 \/ TCP connection \ud83d\udc49\ud83c\udffb2.RTMP \ud578\ub4dc \uc170\uc774\ud06c \/ RTMP Handshake \u2714\ufe0f RTMP\ub294 Adobe\uac00 \ub9cc\ub4e0 \ud504\ub85c\ud1a0\ucf5c\ub85c C0C1 \u2192 S0S1S2 \u2192 C2 \uc21c\uc11c\ub97c \ubb34\uc870\uac74 \uc9c0\ucf1c\uc57c\ud569\ub2c8\ub2e4. \u2714\ufe0f \uc11c\ubc84\uc640 \ud074\ub77c\uc774\uc5b8\ud2b8 \uac04\uc758 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23,1],"tags":[],"class_list":["post-5722","post","type-post","status-publish","format-standard","hentry","category-cpp","category-uncategorized","missing-thumbnail"],"_links":{"self":[{"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/5722","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/comments?post=5722"}],"version-history":[{"count":3,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/5722\/revisions"}],"predecessor-version":[{"id":5726,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/5722\/revisions\/5726"}],"wp:attachment":[{"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/media?parent=5722"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/categories?post=5722"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/tags?post=5722"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}