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74 lines
8.0 KiB
Markdown
74 lines
8.0 KiB
Markdown
| Supported Targets | ESP32 | ESP32-S2 |
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| ----------------- | ----- | ----- |
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# Async request using ASIO
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(See the README.md file in the upper level 'examples' directory for more information about examples.)
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The application aims to show how to connect to a Socks4 proxy using async operations with ASIO. The SOCKS protocol is
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briefly described by the diagram below.
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┌──────┐ ┌─────┐ ┌──────┐
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│Client│ │Proxy│ │Target│
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└──┬───┘ └──┬──┘ └──┬───┘
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│ │ │
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│ ╔═╧══════════════╗ │
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══════════════════════╪════════════════════════╣ Initialization ╠═══╪════════════════════════════════════════════
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│ ╚═╤══════════════╝ │
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│ │ │
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╔══════════════════╗│ │ │
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║We establish a ░║│ Socket Connection │ │
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║TCP connection ║│ <─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ > │
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║and get a socket ║│ │ │
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╚══════════════════╝│ │ │
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│ │ │
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│ ╔═╧══════════════╗ │
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══════════════════════╪════════════════════════╣ Socks Protocol ╠═══╪════════════════════════════════════════════
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│ ╚═╤══════════════╝ │
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│ │ │
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│ Client Connection Request│ │
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│ ─────────────────────────> │
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│ │ │
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│ │ │
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│ ╔════════════╪═══════╤══════════╪════════════════════════════════╗
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│ ║ TARGET CONNECTION │ │ ║
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│ ╟────────────────────┘ │ ╔═══════════════════╗ ║
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│ ║ │ Socket Connection│ ║Proxy establishes ░║ ║
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│ ║ │ <─ ─ ─ ─ ─ ─ ─ ─ > ║ TCPconnection ║ ║
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│ ║ │ │ ║ with target host ║ ║
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│ ╚════════════╪══════════════════╪══╚═══════════════════╝═════════╝
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│ │ │
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│ Response packet │ │
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│ <───────────────────────── │
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│ │ │
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│ │ │
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│ │ ╔═══════╗ │
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══════════════════════╪══════════════════════════╪══╣ Usage ╠═══════╪════════════════════════════════════════════
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│ │ ╚═══════╝ │
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│ │ │
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╔═════════════════╗│ │ │
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║Client uses the ░║│ │ │
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║ socket opened ║│ │ │
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║ with proxy ║│ <─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─>
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║to communicate ║│ │ │
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║ ║│ │ │
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╚═════════════════╝┴───┐ ┌──┴──┐ ┌──┴───┐
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│Client│ │Proxy│ │Target│
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└──────┘ └─────┘ └──────┘
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# Configure and Building example
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This example requires the proxy address to be configured. You can do this using the menuconfig option.
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Proxy address and port must be configured in order for this example to work.
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If using Linux ssh can be used as a proxy for testing.
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```
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ssh -N -v -D 0.0.0.0:1080 localhost
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```
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# Async operations composition and automatic lifetime control
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For documentation about the structure of this example look into [async\_request README](../async_request/README.md).
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