Fix SSH_PUBKEYINFO, limit characters, add tests We fix a bad_bufptr() failure from a previous commit. We now limit the allowed characters to those that will definitely be safe in a shell. Some scripts/programs may use arbitrary environment variables without escaping correctly - that could be a problem in a restricted environment. The current allowed set is a-z A-Z 0-9 .,_-+@ This also adds a test for SSH_PUBKEYINFO, by default it only runs under github actions (or "act -j build").

#include <stdio.h>

int main(void)
{
   char buf[4096];
   int x;
   
   while (fgets(buf, sizeof(buf)-2, stdin) != NULL) {
        for (x = 0; x < 128; ) {
            printf("0x%c%c, ", buf[x], buf[x+1]);
            if (!((x += 2) & 31)) printf("\n");
        }
   }
}


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