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98 lines
2.3 KiB
Plaintext
98 lines
2.3 KiB
Plaintext
RAP protocol
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============
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RAP stands for the Remote Access Protocol of Radare2, it is compatible with radare1
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and it simply defines a communication between a client and a server to simulate IO
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operations.
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There are two different implementations, one in C and another in Python.
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Usage example
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-------------
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Start in one terminal the following command to wait for incoming connections:
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r2 rap://:9999
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In another machine or terminal connect it:
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r2 rap://localhost:9999//bin/ls
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As you see, the path of the remote file to load must be specified, and this handled
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by the open() packet.
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Known Bugs
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----------
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* Read/Write operations ignore the filedescriptor completely because it is suposed to be handled by the IO layer and it is redundant, but it introduces a bug that breaks support for multiple files.
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* This can be fixed with a new packet type RAP_SETFD.
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* Read lengths should be only 2 bytes, there's no sense in read > 64K of memory in a shot.
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* Seek does not returns anything
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* System vs Cmd - the first should have a return value as well as string result
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* Filedescriptors are asumed to be 32bit
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Operations
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----------
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The protocol is designed to be bidirectional, but right now, only one way is supported.
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The client sends a byte specifying the operation and the server will reply the same byte
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masked with the RMT_REPLY value (0x80 | op)
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RAP_OPEN = 1
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RAP_READ = 2
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RAP_WRITE = 3
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RAP_SEEK = 4
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RAP_CLOSE = 5
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RAP_SYSTEM = 6
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RAP_CMD = 7
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RAP_REPLY = 0x80
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This is how are constructed the packets:
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RAP_OPEN
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struct packed RapOpen {
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ut8 op = 1;
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ut8 rw = 0; // 0 = read-only, 1 = read-write
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ut8 len = 15; // length of filename
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}
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>> 01 RW LN [....]
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<< 81 FD=(.. .. .. ..)
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RAP_READ
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>> 02 LN=(.. .. .. ..)
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<< 82 LN=(.. .. .. ..) [..LN..]
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RAP_WRITE
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>> 03 LN=(.. .. .. ..) [..LN..]
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<< 83 LN=(.. .. .. ..)
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RAP_SEEK
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>> 04 FLAG=(..) OFFSET=(.. 8 bytes ..)
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<< 84
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RAP_CLOSE
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>> 05 FD=(4 bytes)
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<< 85 RET=(4 bytes)
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RAP_SYSTEM
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>> 06 LEN=(4 bytes) STR[LEN bytes]
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<< 86 LN=(.. .. .. ..) STR[ LEN bytes]
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RAP_CMD_
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>> 07 LEN=(4 bytes) STR[LEN bytes]
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<< 87 LN=(.. .. .. ..) STR[ LEN bytes]
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Examples
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--------
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Python:
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See radare2-bindings/python/remote.py and test-rap-*.py
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C:
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Server: libr/socket/rap_server.c
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Client: libr/io/p/io_rap.c
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