xmpp_query_namespace.c

Go to the documentation of this file.

/*
 * Handle <iq> <get> <query> type situations (namespace queries)
 *
 * Copyright (c) 2007-2015 by Art Cancro and citadel.org
 *
 * This program is open source software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */
 
#include "../../sysdep.h"
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <signal.h>
#include <pwd.h>
#include <errno.h>
#include <sys/types.h>
#include <time.h>
#include <sys/wait.h>
#include <string.h>
#include <limits.h>
#include <ctype.h>
#include <expat.h>
#include <libcitadel.h>
#include "../../citadel.h"
#include "../../server.h"
#include "../../citserver.h"
#include "../../support.h"
#include "../../config.h"
#include "../../internet_addressing.h"
#include "../../ctdl_module.h"
#include "serv_xmpp.h"
 
 
/*
 * Output a single roster item, for roster queries or pushes
 */
void xmpp_roster_item(struct CitContext *cptr) {
    char xmlbuf1[256];
    char xmlbuf2[256];
 
    cprintf("<item jid=\"%s\" name=\"%s\" subscription=\"both\">",
        xmlesc(xmlbuf1, cptr->cs_principal_id, sizeof xmlbuf1),
        xmlesc(xmlbuf2, cptr->user.fullname, sizeof xmlbuf2)
    );
    cprintf("<group>%s</group>", xmlesc(xmlbuf1, CtdlGetConfigStr("c_humannode"), sizeof xmlbuf1));
    cprintf("</item>");
}
 
 
/* 
 * Return the results for a "jabber:iq:roster:query"
 *
 * Since we are not yet managing a roster, we simply return the entire wholist
 * (minus any entries for this user -- don't tell me about myself)
 *
 */
void xmpp_iq_roster_query(void)
{
    struct CitContext *cptr;
    int nContexts, i;
 
    syslog(LOG_DEBUG, "xmpp: roster push!");
    cprintf("<query xmlns=\"jabber:iq:roster\">");
    cptr = CtdlGetContextArray(&nContexts);
    if (cptr) {
        for (i=0; i<nContexts; i++) {
            if (xmpp_is_visible(&cptr[i], CC)) {
                syslog(LOG_DEBUG, "xmpp: rosterizing %s", cptr[i].user.fullname);
                xmpp_roster_item(&cptr[i]);
            }
        }
        free (cptr);
    }
    cprintf("</query>");
}
 
 
/*
 * Client is doing a namespace query.  These are all handled differently.
 */
void xmpp_query_namespace(char *iq_id, char *iq_from, char *iq_to, char *query_xmlns)
{
    int supported_namespace = 0;
    int roster_query = 0;
    char xmlbuf[256];
    int reply_must_be_from_my_jid = 0;
 
    /* We need to know before we begin the response whether this is a supported namespace, so
     * unfortunately all supported namespaces need to be defined here *and* down below where
     * they are handled.
     */
    if (
        (!strcasecmp(query_xmlns, "jabber:iq:roster:query"))
        || (!strcasecmp(query_xmlns, "jabber:iq:auth:query"))
        || (!strcasecmp(query_xmlns, "http://jabber.org/protocol/disco#items:query"))
        || (!strcasecmp(query_xmlns, "http://jabber.org/protocol/disco#info:query"))
    ) {
        supported_namespace = 1;
    }
 
    syslog(LOG_DEBUG, "xmpp: xmpp_query_namespace(id=%s, from=%s, to=%s, xmlns=%s)", iq_id, iq_from, iq_to, query_xmlns);
 
    /*
     * Beginning of query result.
     */
 
    if (!strcasecmp(query_xmlns, "jabber:iq:roster:query")) {
        reply_must_be_from_my_jid = 1;
    }
 
    char dom[1024];                             // client is expecting to see the reply
    if (reply_must_be_from_my_jid) {                    // coming "from" the user's jid
        safestrncpy(dom, XMPP->client_jid, sizeof(dom));
        char *slash = strchr(dom, '/');
        if (slash) {
            *slash = 0;
        }
    }
    else {
        safestrncpy(dom, XMPP->client_jid, sizeof(dom));        // client is expecting to see the reply
        if (IsEmptyStr(dom)) {                      // coming "from" the domain of the user's jid
            safestrncpy(dom, XMPP->server_name, sizeof(dom));
        }
        char *at = strrchr(dom, '@');
        if (at) {
            strcpy(dom, ++at);
        }
        char *slash = strchr(dom, '/');
        if (slash) {
            *slash = 0;
        }
    }
 
    if (supported_namespace) {
        cprintf("<iq type=\"result\" from=\"%s\" ", xmlesc(xmlbuf, dom, sizeof xmlbuf) );
    }
    else {
        cprintf("<iq type=\"error\" from=\"%s\" ", xmlesc(xmlbuf, dom, sizeof xmlbuf) );
    }
    if (!IsEmptyStr(iq_from)) {
        cprintf("to=\"%s\" ", xmlesc(xmlbuf, iq_from, sizeof xmlbuf));
    }
    cprintf("id=\"%s\">", xmlesc(xmlbuf, iq_id, sizeof xmlbuf));
 
    /*
     * Is this a query we know how to handle?
     */
 
    if (!strcasecmp(query_xmlns, "jabber:iq:roster:query")) {
        roster_query = 1;
        xmpp_iq_roster_query();
    }
 
    else if (!strcasecmp(query_xmlns, "jabber:iq:auth:query")) {
        cprintf("<query xmlns=\"jabber:iq:auth\">"
            "<username/><password/><resource/>"
            "</query>"
        );
    }
 
    // Extension "xep-0030" (http://xmpp.org/extensions/xep-0030.html) (return an empty set of results)
    else if (!strcasecmp(query_xmlns, "http://jabber.org/protocol/disco#items:query")) {
        cprintf("<query xmlns=\"%s\"/>", xmlesc(xmlbuf, query_xmlns, sizeof xmlbuf));
    }
 
    // Extension "xep-0030" (http://xmpp.org/extensions/xep-0030.html) (return an empty set of results)
    else if (!strcasecmp(query_xmlns, "http://jabber.org/protocol/disco#info:query")) {
        cprintf("<query xmlns=\"%s\"/>", xmlesc(xmlbuf, query_xmlns, sizeof xmlbuf));
    }
 
    /*
     * If we didn't hit any known query namespaces then we should deliver a
     * "service unavailable" error (see RFC3921 section 2.4 and 11.1.5.4)
     */
 
    else {
        syslog(LOG_DEBUG, "xmpp: unknown query namespace '%s' - returning <service-unavailable/>", query_xmlns);
        cprintf("<error code=\"503\" type=\"cancel\">"
            "<service-unavailable xmlns=\"urn:ietf:params:xml:ns:xmpp-stanzas\"/>"
            "</error>"
        );
    }
 
    cprintf("</iq>");
 
    /* If we told the client who is on the roster, we also need to tell the client
     * who is *not* on the roster.  (It's down here because we can't do it in the same
     * stanza; this will be an unsolicited push.)
     */
    if (roster_query) {
        xmpp_delete_old_buddies_who_no_longer_exist_from_the_client_roster();
    }
}