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get_SSH_IP gracefully handles missing, IPv6-formatted environment var

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Closes #292 github issue.
This commit is contained in:
Keith Winstein
2012-07-26 22:54:45 -04:00
parent 02f54881be
commit c073ad364a
2 changed files with 19 additions and 3 deletions
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src/frontend/mosh-server.cc
+18 -2
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@@ -122,13 +122,29 @@ void spin( void )
string get_SSH_IP( void )
{
const char *SSH_CONNECTION = getenv( "SSH_CONNECTION" );
fatal_assert( SSH_CONNECTION );
if ( !SSH_CONNECTION ) { /* Older sshds don't set this */
fprintf( stderr, "Warning: SSH_CONNECTION not found; binding to any interface.\n" );
return string( "0.0.0.0" );
}
char *SSH_writable = strdup( SSH_CONNECTION );
fatal_assert( SSH_writable );
strtok( SSH_writable, " " );
strtok( NULL, " " );
const char *local_interface_IP = strtok( NULL, " " );
fatal_assert( local_interface_IP );
if ( !local_interface_IP ) {
fprintf( stderr, "Warning: Could not parse SSH_CONNECTION; binding to any interface.\n" );
return string( "0.0.0.0" );
}
/* Strip IPv6 prefix. */
const char IPv6_prefix[] = "::ffff:";
if ( ( strlen( local_interface_IP ) > strlen( IPv6_prefix ) )
&& ( 0 == strncasecmp( local_interface_IP, IPv6_prefix, strlen( IPv6_prefix ) ) ) ) {
return string( local_interface_IP + strlen( IPv6_prefix ) );
}
return string( local_interface_IP );
}