CURLINFO_LOCAL_IP and CURLINFO_LOCAL_PORT do not work on reused connections.

[maxdymond]

I did this

$ cat demo.c
#include <stdio.h>
#include <curl/curl.h>

int main()
{
  CURL *curl;
  curl = curl_easy_init();
  if(curl) {
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
    curl_easy_perform(curl);
    curl_easy_perform(curl);

    {
      char *ip;
      long port;
      curl_easy_getinfo(curl, CURLINFO_LOCAL_IP, &ip);
      curl_easy_getinfo(curl, CURLINFO_LOCAL_PORT, &port);
      printf("We used local IP and port: %s : %ld\n", ip, port);
    }
    curl_easy_cleanup(curl);
  }
  return 0;
}

I expected the following

<website contents>
We used local IP and port: 172.19.45.229 : 43382

(I get this with my system library at 7.68)

What I actually get is:

<website contents>
We used local IP and port:  : -1

curl/libcurl version

master

operating system

Linux 5.10.16.3-microsoft-standard-WSL2 #1 SMP Fri Apr 2 22:23:49 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

[maxdymond]

According to git bisect this was regressed in d6a37c2 committed on the 27th Jan 2021.

[maxdymond]

Looks like the logic in Curl_updateconninfo was subtly changed in that commit to blank out the IP and port. Presumably before then the connection information wasn't being zeroed out.