8aa6178961
9b4fa0af40cd88ed25dd77962235fbf268bdcaa7 net: Print error message if -proxy is specified without arguments (instead of continuing without proxy server) (practicalswift)
Pull request description:
Exit with error message if `-proxy` is specified without arguments (instead of continuing without proxy server).
Continuing without a proxy server when the end-user has specified `-proxy` may result in accidental loss of privacy. (The end-user might think he/she is using a proxy when he/she is not.)
Before this patch:
```
$ src/bitcoind -proxy
…
2020-09-23T00:24:33Z InitParameterInteraction: parameter interaction: -proxy set -> setting -listen=0
2020-09-23T00:24:33Z InitParameterInteraction: parameter interaction: -proxy set -> setting -upnp=0
2020-09-23T00:24:33Z InitParameterInteraction: parameter interaction: -proxy set -> setting -discover=0
2020-09-23T00:24:33Z InitParameterInteraction: parameter interaction: -listen=0 -> setting -listenonion=0
…
2020-09-23T00:24:33Z init message: Starting network threads...
```
`bitcoind` is now running *without* a proxy server (`GetProxy(…, …) == false`, `HaveNameProxy() == false`, etc.).
Note that the "-proxy set" log messages above which the end-user might interpret as "good, my traffic is now routed via the proxy".
After this patch:
```
$ src/bitcoind -proxy
Error: No proxy server specified. Use -proxy=<ip> or -proxy=<ip:port>.
$ echo $?
1
```
ACKs for top commit:
laanwj:
re-ACK 9b4fa0af40cd88ed25dd77962235fbf268bdcaa7
kristapsk:
ACK 9b4fa0af40cd88ed25dd77962235fbf268bdcaa7, I have tested the code.
hebasto:
re-ACK 9b4fa0af40cd88ed25dd77962235fbf268bdcaa7
Tree-SHA512: 4ba7a011991699a54b5bb87ec68367c681231bf5dcd36f8c89ff9ddc2e8d29df453817b7e362597e652ad6b341a22b7274be0fd78d435e5f0fd8058e5221c4ce
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