postgresql/src/backend/libpq/README.SSL

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>From the servers perspective:
Receives StartupPacket
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(Is SSL_NEGOTIATE_CODE?) ----------- Normal startup
| No
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| Yes
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(Server compiled with USE_SSL?) ------- Send 'N'
| No |
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| Yes Normal startup
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Send 'S'
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Establish SSL
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Normal startup
>From the clients perspective (v6.6 client _with_ SSL):
Connect
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Send packet with SSL_NEGOTIATE_CODE
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Receive single char ------- 'S' -------- Establish SSL
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| '<else>' |
| Normal startup
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Is it 'E' for error ------------------- Retry connection
| Yes without SSL
| No
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Is it 'N' for normal ------------------- Normal startup
| Yes
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Fail with unknown