4 * XMPP (Jabber) service for the Citadel system
5 * Copyright (c) 2007 by Art Cancro
6 * This code is released under the terms of the GNU General Public License.
18 #include <sys/types.h>
20 #if TIME_WITH_SYS_TIME
21 # include <sys/time.h>
25 # include <sys/time.h>
35 #include <libcitadel.h>
38 #include "citserver.h"
46 #include "internet_addressing.h"
48 #include "ctdl_module.h"
52 #include "serv_xmpp.h"
55 /* We have just received a <stream> tag from the client, so send them ours */
57 void xmpp_stream_start(void *data, const char *supplied_el, const char **attr)
60 lprintf(CTDL_DEBUG, "New stream detected.\n");
62 if (CC->logged_in) logout(CC); /* Client may try to log in twice. Handle this. */
65 if (!strcasecmp(attr[0], "to")) {
66 safestrncpy(XMPP->server_name, attr[1], sizeof XMPP->server_name);
71 cprintf("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
73 cprintf("<stream:stream ");
74 cprintf("from=\"%s\" ", XMPP->server_name);
75 cprintf("id=\"%08x\" ", CC->cs_pid);
76 cprintf("version=\"1.0\" ");
77 cprintf("xmlns:stream=\"http://etherx.jabber.org/streams\" ");
78 cprintf("xmlns=\"jabber:client\">");
80 /* The features of this stream are... */
81 cprintf("<stream:features>");
84 cprintf("<bind xmlns=\"urn:ietf:params:xml:ns:xmpp-bind\"/>");
87 cprintf("<session xmlns=\"urn:ietf:params:xml:ns:xmpp-session\"/>");
89 /* A really bad SASL implementation... */
90 xmpp_output_auth_mechs();
92 /* ...and the ability to close XML tags using angle brackets. We should patent this. */
93 cprintf("</stream:features>");
97 void xmpp_xml_start(void *data, const char *supplied_el, const char **attr) {
102 /* Axe the namespace, we don't care about it */
103 safestrncpy(el, supplied_el, sizeof el);
104 while (sep = strchr(el, ':'), sep) {
108 lprintf(CTDL_DEBUG, "XMPP ELEMENT START: <%s>\n", el);
110 for (i=0; attr[i] != NULL; i+=2) {
111 lprintf(CTDL_DEBUG, " Attribute '%s' = '%s'\n", attr[i], attr[i+1]);
114 if (!strcasecmp(el, "stream")) {
115 xmpp_stream_start(data, supplied_el, attr);
118 else if (!strcasecmp(el, "iq")) {
119 const char *iqtype = NULL;
120 const char *iqid = NULL;
121 for (i=0; attr[i] != NULL; i+=2) {
122 if (!strcasecmp(attr[i], "type")) iqtype = attr[i+1];
123 if (!strcasecmp(attr[i], "id")) iqid = attr[i+1];
125 if ((iqtype != NULL) && (iqid != NULL)) {
126 if (!strcasecmp(iqtype, "set")) {
127 safestrncpy(XMPP->iq_bind_id, iqid, sizeof XMPP->iq_bind_id);
132 else if (!strcasecmp(el, "auth")) {
133 XMPP->sasl_auth_mech[0] = 0;
134 for (i=0; attr[i] != NULL; i+=2) {
135 if (!strcasecmp(attr[i], "mechanism")) {
136 safestrncpy(XMPP->sasl_auth_mech, attr[i+1], sizeof XMPP->sasl_auth_mech);
144 void xmpp_xml_end(void *data, const char *supplied_el) {
148 /* Axe the namespace, we don't care about it */
149 safestrncpy(el, supplied_el, sizeof el);
150 while (sep = strchr(el, ':'), sep) {
154 lprintf(CTDL_DEBUG, "XMPP ELEMENT END : <%s>\n", el);
155 if (XMPP->chardata_len > 0) {
156 lprintf(CTDL_DEBUG, " chardata: %s\n", XMPP->chardata);
159 if (!strcasecmp(el, "resource")) {
160 if (XMPP->chardata_len > 0) {
161 safestrncpy(XMPP->iq_client_resource, XMPP->chardata,
162 sizeof XMPP->iq_client_resource);
166 else if (!strcasecmp(el, "iq")) {
169 /* If this <iq> stanza was a "bind" attempt, process it ... */
171 if ( (!IsEmptyStr(XMPP->iq_bind_id)) && (!IsEmptyStr(XMPP->iq_client_resource)) ) {
173 /* Generate the "full JID" of the client resource */
175 snprintf(XMPP->client_jid, sizeof XMPP->client_jid,
179 XMPP->iq_client_resource
182 /* Tell the client what its JID is */
184 cprintf("<iq type=\"result\" id=\"%s\">", XMPP->iq_bind_id);
185 cprintf("<bind xmlns=\"urn:ietf:params:xml:ns:xmpp-bind\">");
186 cprintf("<jid>%s</jid>", XMPP->client_jid);
192 cprintf("<iq type=\"error\" id=\"%s\">", XMPP->iq_bind_id);
193 cprintf("<error></error>");
197 /* Now clear these fields out so they don't get used by a future stanza */
198 XMPP->iq_bind_id[0] = 0;
199 XMPP->iq_client_resource[0] = 0;
202 else if (!strcasecmp(el, "auth")) {
204 /* Try to authenticate (this function is responsible for the output stanza) */
205 xmpp_sasl_auth(XMPP->sasl_auth_mech, (XMPP->chardata != NULL ? XMPP->chardata : "") );
207 /* Now clear these fields out so they don't get used by a future stanza */
208 XMPP->sasl_auth_mech[0] = 0;
211 XMPP->chardata_len = 0;
212 if (XMPP->chardata_alloc > 0) {
213 XMPP->chardata[0] = 0;
218 void xmpp_xml_chardata(void *data, const XML_Char *s, int len)
220 struct citxmpp *X = XMPP;
222 if (X->chardata_alloc == 0) {
223 X->chardata_alloc = SIZ;
224 X->chardata = malloc(X->chardata_alloc);
226 if ((X->chardata_len + len + 1) > X->chardata_alloc) {
227 X->chardata_alloc = X->chardata_len + len + 1024;
228 X->chardata = realloc(X->chardata, X->chardata_alloc);
230 memcpy(&X->chardata[X->chardata_len], s, len);
231 X->chardata_len += len;
232 X->chardata[X->chardata_len] = 0;
237 * This cleanup function blows away the temporary memory and files used by the XMPP service.
239 void xmpp_cleanup_function(void) {
241 /* Don't do this stuff if this is not a XMPP session! */
242 if (CC->h_command_function != xmpp_command_loop) return;
244 lprintf(CTDL_DEBUG, "Performing XMPP cleanup hook\n");
245 if (XMPP->chardata != NULL) {
246 free(XMPP->chardata);
247 XMPP->chardata = NULL;
248 XMPP->chardata_len = 0;
249 XMPP->chardata_alloc = 0;
251 XML_ParserFree(XMPP->xp);
258 * Here's where our XMPP session begins its happy day.
260 void xmpp_greeting(void) {
261 strcpy(CC->cs_clientname, "Jabber session");
262 CC->session_specific_data = malloc(sizeof(struct citxmpp));
263 memset(XMPP, 0, sizeof(struct citxmpp));
265 /* XMPP does not use a greeting, but we still have to initialize some things. */
267 XMPP->xp = XML_ParserCreateNS("UTF-8", ':');
268 if (XMPP->xp == NULL) {
269 lprintf(CTDL_ALERT, "Cannot create XML parser!\n");
274 XML_SetElementHandler(XMPP->xp, xmpp_xml_start, xmpp_xml_end);
275 XML_SetCharacterDataHandler(XMPP->xp, xmpp_xml_chardata);
276 // XML_SetUserData(XMPP->xp, something...);
281 * Main command loop for XMPP sessions.
283 void xmpp_command_loop(void) {
288 memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
289 retval = client_read(cmdbuf, 1);
291 lprintf(CTDL_ERR, "Client disconnected: ending session.\r\n");
296 /* FIXME ... this is woefully inefficient. */
298 XML_Parse(XMPP->xp, cmdbuf, 1, 0);
301 const char *CitadelServiceXMPP="XMPP";
303 #endif /* HAVE_EXPAT */
305 CTDL_MODULE_INIT(jabber)
309 /* CtdlRegisterServiceHook(config.c_xmpp_port, FIXME */
310 CtdlRegisterServiceHook(5222,
316 CtdlRegisterSessionHook(xmpp_cleanup_function, EVT_STOP);
318 lprintf(CTDL_INFO, "This server is missing the Expat XML parser. Jabber service will be disabled.\n");
322 /* return our Subversion id for the Log */