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 (!strcasecmp(attr[0], "to")) {
63 safestrncpy(XMPP->server_name, attr[1], sizeof XMPP->server_name);
68 cprintf("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
70 cprintf("<stream:stream ");
71 cprintf("from=\"%s\" ", XMPP->server_name);
72 cprintf("id=\"%08x\" ", CC->cs_pid);
73 cprintf("version=\"1.0\" ");
74 cprintf("xmlns:stream=\"http://etherx.jabber.org/streams\" ");
75 cprintf("xmlns=\"jabber:client\">");
77 /* The features of this stream are... */
78 cprintf("<stream:features>");
81 cprintf("<bind xmlns=\"urn:ietf:params:xml:ns:xmpp-bind\"/>");
84 cprintf("<session xmlns=\"urn:ietf:params:xml:ns:xmpp-session\"/>");
86 /* A really bad SASL implementation... */
87 xmpp_output_auth_mechs();
89 /* ...and the ability to close XML tags using angle brackets. We should patent this. */
90 cprintf("</stream:features>");
94 void xmpp_xml_start(void *data, const char *supplied_el, const char **attr) {
99 /* Axe the namespace, we don't care about it */
100 safestrncpy(el, supplied_el, sizeof el);
101 while (sep = strchr(el, ':'), sep) {
105 lprintf(CTDL_DEBUG, "XMPP ELEMENT START: <%s>\n", el);
107 for (i=0; attr[i] != NULL; i+=2) {
108 lprintf(CTDL_DEBUG, " Attribute '%s' = '%s'\n", attr[i], attr[i+1]);
111 if (!strcasecmp(el, "stream")) {
112 xmpp_stream_start(data, supplied_el, attr);
115 else if (!strcasecmp(el, "iq")) {
116 const char *iqtype = NULL;
117 const char *iqid = NULL;
118 for (i=0; attr[i] != NULL; i+=2) {
119 if (!strcasecmp(attr[i], "type")) iqtype = attr[i+1];
120 if (!strcasecmp(attr[i], "id")) iqid = attr[i+1];
122 if ((iqtype != NULL) && (iqid != NULL)) {
123 if (!strcasecmp(iqtype, "set")) {
124 safestrncpy(XMPP->iq_bind_id, iqid, sizeof XMPP->iq_bind_id);
129 else if (!strcasecmp(el, "auth")) {
130 XMPP->sasl_auth_mech[0] = 0;
131 for (i=0; attr[i] != NULL; i+=2) {
132 if (!strcasecmp(attr[i], "mechanism")) {
133 safestrncpy(XMPP->sasl_auth_mech, attr[i+1], sizeof XMPP->sasl_auth_mech);
141 void xmpp_xml_end(void *data, const char *supplied_el) {
145 /* Axe the namespace, we don't care about it */
146 safestrncpy(el, supplied_el, sizeof el);
147 while (sep = strchr(el, ':'), sep) {
151 lprintf(CTDL_DEBUG, "XMPP ELEMENT END : <%s>\n", el);
152 if (XMPP->chardata_len > 0) {
153 lprintf(CTDL_DEBUG, " chardata: %s\n", XMPP->chardata);
156 if (!strcasecmp(el, "resource")) {
157 if (XMPP->chardata_len > 0) {
158 safestrncpy(XMPP->iq_client_resource, XMPP->chardata,
159 sizeof XMPP->iq_client_resource);
163 else if (!strcasecmp(el, "iq")) {
166 /* If this <iq> stanza was a "bind" attempt, process it ... */
168 if ( (!IsEmptyStr(XMPP->iq_bind_id)) && (!IsEmptyStr(XMPP->iq_client_resource)) ) {
170 /* Generate the "full JID" of the client resource */
172 snprintf(XMPP->client_jid, sizeof XMPP->client_jid,
176 XMPP->iq_client_resource
179 /* Tell the client what its JID is */
181 cprintf("<iq type=\"result\" id=\"%s\">", XMPP->iq_bind_id);
182 cprintf("<bind xmlns=\"urn:ietf:params:xml:ns:xmpp-bind\">");
183 cprintf("<jid>%s</jid>", XMPP->client_jid);
189 cprintf("<iq type=\"error\" id=\"%s\">", XMPP->iq_bind_id);
190 cprintf("<error></error>");
194 /* Now clear these fields out so they don't get used by a future stanza */
195 XMPP->iq_bind_id[0] = 0;
196 XMPP->iq_client_resource[0] = 0;
199 else if (!strcasecmp(el, "auth")) {
201 /* Try to authenticate (this function is responsible for the output stanza) */
202 xmpp_sasl_auth(XMPP->sasl_auth_mech, (XMPP->chardata != NULL ? XMPP->chardata : "") );
204 /* Now clear these fields out so they don't get used by a future stanza */
205 XMPP->sasl_auth_mech[0] = 0;
208 XMPP->chardata_len = 0;
209 if (XMPP->chardata_alloc > 0) {
210 XMPP->chardata[0] = 0;
215 void xmpp_xml_chardata(void *data, const XML_Char *s, int len)
217 struct citxmpp *X = XMPP;
219 if (X->chardata_alloc == 0) {
220 X->chardata_alloc = SIZ;
221 X->chardata = malloc(X->chardata_alloc);
223 if ((X->chardata_len + len + 1) > X->chardata_alloc) {
224 X->chardata_alloc = X->chardata_len + len + 1024;
225 X->chardata = realloc(X->chardata, X->chardata_alloc);
227 memcpy(&X->chardata[X->chardata_len], s, len);
228 X->chardata_len += len;
229 X->chardata[X->chardata_len] = 0;
234 * This cleanup function blows away the temporary memory and files used by the XMPP service.
236 void xmpp_cleanup_function(void) {
238 /* Don't do this stuff if this is not a XMPP session! */
239 if (CC->h_command_function != xmpp_command_loop) return;
241 lprintf(CTDL_DEBUG, "Performing XMPP cleanup hook\n");
242 if (XMPP->chardata != NULL) {
243 free(XMPP->chardata);
244 XMPP->chardata = NULL;
245 XMPP->chardata_len = 0;
246 XMPP->chardata_alloc = 0;
248 XML_ParserFree(XMPP->xp);
255 * Here's where our XMPP session begins its happy day.
257 void xmpp_greeting(void) {
258 strcpy(CC->cs_clientname, "Jabber session");
259 CC->session_specific_data = malloc(sizeof(struct citxmpp));
260 memset(XMPP, 0, sizeof(struct citxmpp));
262 /* XMPP does not use a greeting, but we still have to initialize some things. */
264 XMPP->xp = XML_ParserCreateNS("UTF-8", ':');
265 if (XMPP->xp == NULL) {
266 lprintf(CTDL_ALERT, "Cannot create XML parser!\n");
271 XML_SetElementHandler(XMPP->xp, xmpp_xml_start, xmpp_xml_end);
272 XML_SetCharacterDataHandler(XMPP->xp, xmpp_xml_chardata);
273 // XML_SetUserData(XMPP->xp, something...);
278 * Main command loop for XMPP sessions.
280 void xmpp_command_loop(void) {
285 memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
286 retval = client_read(cmdbuf, 1);
288 lprintf(CTDL_ERR, "Client disconnected: ending session.\r\n");
293 /* FIXME ... this is woefully inefficient. */
295 XML_Parse(XMPP->xp, cmdbuf, 1, 0);
298 const char *CitadelServiceXMPP="XMPP";
300 #endif /* HAVE_EXPAT */
302 CTDL_MODULE_INIT(jabber)
306 /* CtdlRegisterServiceHook(config.c_xmpp_port, FIXME */
307 CtdlRegisterServiceHook(5222,
313 CtdlRegisterSessionHook(xmpp_cleanup_function, EVT_STOP);
315 lprintf(CTDL_INFO, "This server is missing the Expat XML parser. Jabber service will be disabled.\n");
319 /* return our Subversion id for the Log */