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dnsdist: Save history to home-dir #4779

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merged 1 commit into from Jan 13, 2017

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@pieterlexis
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pieterlexis commented Dec 16, 2016

Short description

Only use CWD as a last resort. This prevents cluttering directories with .dnsdist_history files

Closes #4562

Checklist

I have:

  • read the CONTRIBUTING.md document
  • compiled and tested this code
  • included documentation (including possible behaviour changes)
  • documented the code
  • added regression tests
  • added unit tests
  • checked that this code was merged to master

@pieterlexis pieterlexis force-pushed the pieterlexis:dnsdist-history-to-home branch 3 times, most recently from a4d8d99 to 936c472 Dec 16, 2016

struct passwd pwd;
struct passwd *result;
char buf[16384];
getpwuid_r(getuid(), &pwd, buf, sizeof(buf), &result);

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@rgacogne

rgacogne Dec 20, 2016

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I'm wondering if we should use geteuid() instead, in the unlikely event dnsdist is started with -u while in foreground mode.

ret = string(pwd.pw_dir);
if (homedir && !ignoreHOME) // $HOME overrides what the OS tells us
ret = string(homedir);
ret.append("/.dnsdist_history");

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@rgacogne

rgacogne Dec 20, 2016

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How about not setting ret to "." beforehand and testing here if it's empty? If it is (somehow $HOME or pwd.pw_dir were empty or nothing worked), we could then fallback to "." before appending "/.dnsdist_history". This would prevent trying to write in "/.dnsdist_history".

@pieterlexis pieterlexis force-pushed the pieterlexis:dnsdist-history-to-home branch from 936c472 to 9364403 Dec 20, 2016

@pieterlexis pieterlexis merged commit 6f3c797 into PowerDNS:master Jan 13, 2017

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@pieterlexis pieterlexis deleted the pieterlexis:dnsdist-history-to-home branch Jan 13, 2017

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