Differences From Artifact [42e8cab931]:

• File pscp.c — part of check-in [998dfad436] at 2013-11-17 08:05:41 on branch trunk — Implement connection sharing between instances of PuTTY. The basic strategy is described at the top of the new source file sshshare.c. In very brief: an 'upstream' PuTTY opens a Unix-domain socket or Windows named pipe, and listens for connections from other PuTTYs wanting to run sessions on the same server. The protocol spoken down that socket/pipe is essentially the bare ssh-connection protocol, using a trivial binary packet protocol with no encryption, and the upstream has to do some fiddly transformations that I've been referring to as 'channel-number NAT' to avoid resource clashes between the sessions it's managing. This is quite different from OpenSSH's approach of using the Unix- domain socket as a means of passing file descriptors around; the main reason for that is that fd-passing is Unix-specific but this system has to work on Windows too. However, there are additional advantages, such as making it easy for each downstream PuTTY to run its own independent set of port and X11 forwardings (though the method for making the latter work is quite painful). Sharing is off by default, but configuration is intended to be very easy in the normal case - just tick one box in the SSH config panel and everything else happens automatically. (user: simon size: 61835)

To Artifact [ac9bd0a2ba]:

• File pscp.c — part of check-in [7c4cad97cb] at 2014-01-25 09:58:54 on branch trunk — Use the new host_str* functions to improve IPv6 literal support. I've gone through everywhere we handle host names / addresses (on command lines, in PuTTY config, in port forwarding, in X display names, in host key storage...) and tried to make them handle IPv6 literals sensibly, by using the host_str* functions I introduced in my previous commit. Generally it's now OK to use a bracketed IPv6 literal anywhere a hostname might have been valid; in a few cases where no ambiguity exists (e.g. no :port suffix is permitted anyway) unbracketed IPv6 literals are also acceptable. (user: simon size: 61411)

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    char *realhost;
    void *logctx;

    if (host == NULL || host[0] == '\0')
	bump("Empty host name");

    /*
     * Remove fiddly bits of address: remove a colon suffix, and
     * Remove a colon suffix.
     * the square brackets around an IPv6 literal address.
     */
    if (host[0] == '[') {
	host++;
	host[strcspn(host, "]")] = '\0';
    } else {
	host[strcspn(host, ":")] = '\0';
    host[host_strcspn(host, ":")] = '\0';
    }

    /*
     * If we haven't loaded session details already (e.g., from -load),
     * try looking for a session called "host".
     */
    if (!loaded_session) {
	/* Try to load settings for `host' into a temporary config */

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{
    /* We ignore a leading colon, since the hostname cannot be
       empty. We also ignore a colon as second character because
       of filenames like f:myfile.txt. */
    if (str[0] == '\0' || str[0] == ':' ||
        (str[0] != '[' && str[1] == ':'))
	return (NULL);
    while (*str != '\0' && *str != ':' && *str != '/' && *str != '\\') {
	if (*str == '[') {
	    /* Skip over IPv6 literal addresses
	     * (eg: 'jeroen@[2001:db8::1]:myfile.txt') */
	    char *ipv6_end = strchr(str, ']');
    str += host_strcspn(str, ":/\\");
	    if (ipv6_end) {
		str = ipv6_end;
	    }
	}
	str++;
    }
    if (*str == ':')
	return (str);
    else
	return (NULL);
}

/*