[tor-bugs] #18276 [Tor]: directory_send_command doesn't check string operation return values

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#18276: directory_send_command doesn't check string operation return values
------------------------+--------------------------------
     Reporter:  teor    |      Owner:
         Type:  defect  |     Status:  new
     Priority:  Low     |  Milestone:  Tor: 0.2.9.x-final
    Component:  Tor     |    Version:
     Severity:  Minor   |   Keywords:  easy
Actual Points:          |  Parent ID:
       Points:  low     |    Sponsor:
------------------------+--------------------------------
 When reviewing directory_send_command() in #18051, I noticed:

 We are not checking the return values of tor_snprintf and strlcpy, I
 wonder if we should do that.

 I wonder if the buffers are large enough:
 * the maximum length of a DNS name is 254 characters, but the buffers are
 128 characters
   * the maximum length of an IPv6 address is 48 characters (see
 TOR_ADDR_BUF_LEN)
   * the maximum length of an IPv4 address is 15 characters
 * the `:port` adds another 6 characters
 * the `http://` adds another 7 characters

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18276>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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