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");
63 if (!strcasecmp(attr[0], "to")) {
64 safestrncpy(XMPP->server_name, attr[1], sizeof XMPP->server_name);
69 cprintf("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
71 cprintf("<stream:stream ");
72 cprintf("from=\"%s\" ", XMPP->server_name);
73 cprintf("id=\"%08x\" ", CC->cs_pid);
74 cprintf("version=\"1.0\" ");
75 cprintf("xmlns:stream=\"http://etherx.jabber.org/streams\" ");
76 cprintf("xmlns=\"jabber:client\">");
78 /* The features of this stream are... */
79 cprintf("<stream:features>");
82 cprintf("<bind xmlns=\"urn:ietf:params:xml:ns:xmpp-bind\"/>");
85 cprintf("<session xmlns=\"urn:ietf:params:xml:ns:xmpp-session\"/>");
87 /* A really bad SASL implementation... */
88 xmpp_output_auth_mechs();
90 /* ...and the ability to close XML tags using angle brackets. We should patent this. */
91 cprintf("</stream:features>");
95 void xmpp_xml_start(void *data, const char *supplied_el, const char **attr) {
100 /* Axe the namespace, we don't care about it */
101 safestrncpy(el, supplied_el, sizeof el);
102 while (sep = strchr(el, ':'), sep) {
106 lprintf(CTDL_DEBUG, "XMPP ELEMENT START: <%s>\n", el);
108 for (i=0; attr[i] != NULL; i+=2) {
109 lprintf(CTDL_DEBUG, " Attribute '%s' = '%s'\n", attr[i], attr[i+1]);
112 if (!strcasecmp(el, "stream")) {
113 xmpp_stream_start(data, supplied_el, attr);
116 else if (!strcasecmp(el, "iq")) {
117 const char *iqtype = NULL;
118 const char *iqid = NULL;
119 for (i=0; attr[i] != NULL; i+=2) {
120 if (!strcasecmp(attr[i], "type")) iqtype = attr[i+1];
121 if (!strcasecmp(attr[i], "id")) iqid = attr[i+1];
123 if ((iqtype != NULL) && (iqid != NULL)) {
124 if (!strcasecmp(iqtype, "set")) {
125 safestrncpy(XMPP->iq_bind_id, iqid, sizeof XMPP->iq_bind_id);
130 else if (!strcasecmp(el, "auth")) {
131 XMPP->sasl_auth_mech[0] = 0;
132 for (i=0; attr[i] != NULL; i+=2) {
133 if (!strcasecmp(attr[i], "mechanism")) {
134 safestrncpy(XMPP->sasl_auth_mech, attr[i+1], sizeof XMPP->sasl_auth_mech);
142 void xmpp_xml_end(void *data, const char *supplied_el) {
146 /* Axe the namespace, we don't care about it */
147 safestrncpy(el, supplied_el, sizeof el);
148 while (sep = strchr(el, ':'), sep) {
152 lprintf(CTDL_DEBUG, "XMPP ELEMENT END : <%s>\n", el);
153 if (XMPP->chardata_len > 0) {
154 lprintf(CTDL_DEBUG, " chardata: %s\n", XMPP->chardata);
157 if (!strcasecmp(el, "resource")) {
158 if (XMPP->chardata_len > 0) {
159 safestrncpy(XMPP->iq_client_resource, XMPP->chardata,
160 sizeof XMPP->iq_client_resource);
164 else if (!strcasecmp(el, "iq")) {
167 /* If this <iq> stanza was a "bind" attempt, process it ... */
169 if ( (!IsEmptyStr(XMPP->iq_bind_id)) && (!IsEmptyStr(XMPP->iq_client_resource)) ) {
171 /* Generate the "full JID" of the client resource */
173 snprintf(XMPP->client_jid, sizeof XMPP->client_jid,
177 XMPP->iq_client_resource
180 /* Tell the client what its JID is */
182 cprintf("<iq type=\"result\" id=\"%s\">", XMPP->iq_bind_id);
183 cprintf("<bind xmlns=\"urn:ietf:params:xml:ns:xmpp-bind\">");
184 cprintf("<jid>%s</jid>", XMPP->client_jid);
189 else if (XMPP->iq_session) {
190 cprintf("<iq type=\"result\" id=\"%s\">", XMPP->iq_bind_id);
195 cprintf("<iq type=\"error\" id=\"%s\">", XMPP->iq_bind_id);
196 cprintf("<error></error>");
200 /* Now clear these fields out so they don't get used by a future stanza */
201 XMPP->iq_bind_id[0] = 0;
202 XMPP->iq_client_resource[0] = 0;
203 XMPP->iq_session = 1;
206 else if (!strcasecmp(el, "auth")) {
208 /* Try to authenticate (this function is responsible for the output stanza) */
209 xmpp_sasl_auth(XMPP->sasl_auth_mech, (XMPP->chardata != NULL ? XMPP->chardata : "") );
211 /* Now clear these fields out so they don't get used by a future stanza */
212 XMPP->sasl_auth_mech[0] = 0;
215 else if (!strcasecmp(el, "session")) {
216 XMPP->iq_session = 1;
219 XMPP->chardata_len = 0;
220 if (XMPP->chardata_alloc > 0) {
221 XMPP->chardata[0] = 0;
226 void xmpp_xml_chardata(void *data, const XML_Char *s, int len)
228 struct citxmpp *X = XMPP;
230 if (X->chardata_alloc == 0) {
231 X->chardata_alloc = SIZ;
232 X->chardata = malloc(X->chardata_alloc);
234 if ((X->chardata_len + len + 1) > X->chardata_alloc) {
235 X->chardata_alloc = X->chardata_len + len + 1024;
236 X->chardata = realloc(X->chardata, X->chardata_alloc);
238 memcpy(&X->chardata[X->chardata_len], s, len);
239 X->chardata_len += len;
240 X->chardata[X->chardata_len] = 0;
245 * This cleanup function blows away the temporary memory and files used by the XMPP service.
247 void xmpp_cleanup_function(void) {
249 /* Don't do this stuff if this is not a XMPP session! */
250 if (CC->h_command_function != xmpp_command_loop) return;
252 lprintf(CTDL_DEBUG, "Performing XMPP cleanup hook\n");
253 if (XMPP->chardata != NULL) {
254 free(XMPP->chardata);
255 XMPP->chardata = NULL;
256 XMPP->chardata_len = 0;
257 XMPP->chardata_alloc = 0;
259 XML_ParserFree(XMPP->xp);
266 * Here's where our XMPP session begins its happy day.
268 void xmpp_greeting(void) {
269 strcpy(CC->cs_clientname, "Jabber session");
270 CC->session_specific_data = malloc(sizeof(struct citxmpp));
271 memset(XMPP, 0, sizeof(struct citxmpp));
273 /* XMPP does not use a greeting, but we still have to initialize some things. */
275 XMPP->xp = XML_ParserCreateNS("UTF-8", ':');
276 if (XMPP->xp == NULL) {
277 lprintf(CTDL_ALERT, "Cannot create XML parser!\n");
282 XML_SetElementHandler(XMPP->xp, xmpp_xml_start, xmpp_xml_end);
283 XML_SetCharacterDataHandler(XMPP->xp, xmpp_xml_chardata);
284 // XML_SetUserData(XMPP->xp, something...);
289 * Main command loop for XMPP sessions.
291 void xmpp_command_loop(void) {
296 memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
297 retval = client_read(cmdbuf, 1);
299 lprintf(CTDL_ERR, "Client disconnected: ending session.\r\n");
304 /* FIXME ... this is woefully inefficient. */
306 XML_Parse(XMPP->xp, cmdbuf, 1, 0);
309 const char *CitadelServiceXMPP="XMPP";
311 #endif /* HAVE_EXPAT */
313 CTDL_MODULE_INIT(jabber)
317 /* CtdlRegisterServiceHook(config.c_xmpp_port, FIXME */
318 CtdlRegisterServiceHook(5222,
324 CtdlRegisterSessionHook(xmpp_cleanup_function, EVT_STOP);
326 lprintf(CTDL_INFO, "This server is missing the Expat XML parser. Jabber service will be disabled.\n");
330 /* return our Subversion id for the Log */