Pileus Git - ~andy/lamechat/blob - xmpp.c

   1 /*
   2  * Copyright (C) 2017 Andy Spencer <andy753421@gmail.com>
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #define _GNU_SOURCE
  19
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <stdarg.h>
  23 #include <string.h>
  24 #include <errno.h>
  25 #include <expat.h>
  26 #include <time.h>
  27
  28 #include "util.h"
  29 #include "conf.h"
  30 #include "chat.h"
  31 #include "net.h"
  32
  33 /* Constants */
  34 #define AUTH_LEN 512
  35 #define JID_LEN  256
  36
  37 /* XMPP types */
  38 typedef enum {
  39         XMPP_CONNECT,
  40         XMPP_ENCRYPT,
  41         XMPP_RESTART,
  42         XMPP_SEND_STREAM,
  43         XMPP_RECV_FEATURES,
  44         XMPP_SEND_STARTTLS,
  45         XMPP_RECV_PROCEED,
  46         XMPP_SEND_AUTH,
  47         XMPP_RECV_SUCCESS,
  48         XMPP_SEND_BIND,
  49         XMPP_RECV_JID,
  50         XMPP_SEND_PRESENCE,
  51         XMPP_READY,
  52         XMPP_IN_IQ,
  53         XMPP_IN_MESSAGE,
  54         XMPP_IN_PRESENCE,
  55 } xmpp_state_t;
  56
  57 typedef struct {
  58         channel_t       channel;
  59         char            dest[JID_LEN];
  60
  61         const char     *room;
  62         int             join;
  63 } xmpp_channel_t;
  64
  65 typedef struct {
  66         server_t        server;
  67         xmpp_channel_t  system;
  68
  69         int             connect;
  70         const char     *host;
  71         int             port;
  72         const char     *muc;
  73         const char     *nick;
  74         const char     *jid;
  75         const char     *user;
  76         const char     *pass;
  77         int             quiet;
  78
  79         net_t           net;
  80         XML_Parser      expat;
  81         xmpp_state_t    state;
  82         buf_t           buf;
  83         int             indent;
  84
  85         char           *body;
  86         stamp_t         stamp;
  87
  88         int             in_error;
  89
  90         char            msg_jid[JID_LEN];
  91         char            msg_usr[JID_LEN];
  92         char            msg_srv[JID_LEN];
  93         char            msg_res[JID_LEN];
  94         char           *msg_from;
  95         xmpp_channel_t *msg_chan;
  96 } xmpp_server_t;
  97
  98 /* Helper functions */
  99 static void srv_notice(xmpp_server_t *srv, const char *fmt, ...)
 100 {
 101         static char buf[1024];
 102
 103         va_list ap;
 104         va_start(ap, fmt);
 105         vsnprintf(buf, sizeof(buf), fmt, ap);
 106         va_end(ap);
 107
 108         chat_recv(&srv->system.channel, NULL, buf);
 109 }
 110
 111 static void chan_notice(xmpp_channel_t *chan, const char *fmt, ...)
 112 {
 113         static char buf[1024];
 114
 115         va_list ap;
 116         va_start(ap, fmt);
 117         vsnprintf(buf, sizeof(buf), fmt, ap);
 118         va_end(ap);
 119
 120         chat_recv(&chan->channel, NULL, buf);
 121 }
 122
 123 static void split_jid(const char *jid, char *usr, char *srv, char *res)
 124 {
 125         char *ptr = usr;
 126         int   pos = 0;
 127
 128         if (usr) usr[0] = '\0';
 129         if (srv) srv[0] = '\0';
 130         if (res) res[0] = '\0';
 131
 132         for (int i = 0; jid && jid[i]; i++) {
 133                 switch (jid[i]) {
 134                         case '@':
 135                                 ptr = srv;
 136                                 pos = 0;
 137                                 continue;
 138                         case '/':
 139                                 ptr = res;
 140                                 pos = 0;
 141                                 continue;
 142                 }
 143                 if (ptr && (pos+1) < JID_LEN) {
 144                         ptr[pos++] = jid[i];
 145                         ptr[pos] = '\0';
 146                 }
 147         }
 148
 149         //debug("JID: '%s' usr=[%s] srv=[%s] res=[%s]",
 150         //              jid, usr, srv, res);
 151 }
 152
 153 static xmpp_channel_t *find_dest(xmpp_server_t *srv,
 154                 const char *jid, int is_muc)
 155 {
 156         static char jid_usr[JID_LEN];
 157         static char jid_srv[JID_LEN];
 158         static char dest[JID_LEN];
 159         xmpp_channel_t *chan;
 160
 161         split_jid(jid, jid_usr, jid_srv, NULL);
 162         snprintf(dest, JID_LEN, "%s@%s", jid_usr,
 163                  jid_srv[0] ? jid_srv  :
 164                  is_muc     ? srv->muc : srv->host);
 165
 166         /* Server channels */
 167         if (match(jid, srv->host))
 168                 return &srv->system;
 169
 170         /* Find existing channels */
 171         for (channel_t *cur = channels; cur; cur = cur->next) {
 172                 if (cur->server != &srv->server)
 173                         continue;
 174                 chan = (xmpp_channel_t *)cur;
 175                 if (match(chan->dest, dest))
 176                         return chan;
 177         }
 178
 179         /* Create a new channel */
 180         chan = (xmpp_channel_t *)add_channel(jid_usr, &srv->server);
 181         strncpy(chan->dest, dest, JID_LEN);
 182         return chan;
 183 }
 184
 185 static const char *find_attr(const char **attrs, const char *name)
 186 {
 187         for (int i = 0; attrs[i] && attrs[i+1]; i += 2)
 188                 if (match(attrs[i+0], name))
 189                         return attrs[i+1];
 190         return NULL;
 191 }
 192
 193 /* Callback functions */
 194 static void xmpp_run(xmpp_server_t *srv,
 195                 const char *start, const char **attrs,
 196                 const char *end, const char *data);
 197
 198 static void on_start(void *_srv, const char *tag, const char **attrs)
 199 {
 200         xmpp_server_t *srv = _srv;
 201         xmpp_run(srv, tag, attrs, NULL, reset(&srv->buf));
 202 }
 203
 204 static void on_data(void *_srv, const char *data, int len)
 205 {
 206         xmpp_server_t *srv = _srv;
 207         append(&srv->buf, data, len);
 208 }
 209
 210 static void on_end(void *_srv, const char *tag)
 211 {
 212         xmpp_server_t *srv = _srv;
 213         xmpp_run(srv, NULL, NULL, tag, reset(&srv->buf));
 214 }
 215
 216 static void on_send(void *_srv)
 217 {
 218         xmpp_server_t *srv = _srv;
 219         xmpp_run(srv, NULL, NULL, NULL, NULL);
 220 }
 221
 222 static void on_recv(void *_srv, char *buf, int len)
 223 {
 224         xmpp_server_t *srv = _srv;
 225         if (len > 0)
 226                 XML_Parse(srv->expat, buf, len, 0);
 227         xmpp_run(srv, NULL, NULL, NULL, NULL);
 228 }
 229
 230 static void on_err(void *_srv, int errno)
 231 {
 232         xmpp_server_t *srv = _srv;
 233         xmpp_run(srv, NULL, NULL, NULL, NULL);
 234 }
 235
 236 /* XMPP State machine */
 237 static void xmpp_run(xmpp_server_t *srv,
 238                 const char *start, const char **attrs,
 239                 const char *end, const char *data)
 240 {
 241         xmpp_channel_t *chan = NULL;
 242
 243         /* Debug print */
 244         if (data)
 245                 debug("%*s \"%s\"", srv->indent*4, "", data);
 246         if (start) {
 247                 debug("%*s<%s>", srv->indent*4, "", start);
 248                 for (int i = 0; attrs[i] && attrs[i+1]; i += 2) {
 249                         debug("%*s%s=\"%s\"%s",
 250                                 srv->indent*4+8, "",
 251                                 attrs[i+0], attrs[i+1],
 252                                 attrs[i+2] ? "" : ">");
 253                 }
 254         }
 255         if (start)
 256                 srv->indent++;
 257         if (end)
 258                 srv->indent--;
 259
 260         /* Connection Handling */
 261         if (srv->state == XMPP_CONNECT && !start && !end) {
 262                 srv->net.send = on_send;
 263                 srv->net.recv = on_recv;
 264                 srv->net.err  = on_err;
 265                 srv->net.data = srv;
 266                 net_open(&srv->net, srv->host, srv->port);
 267
 268                 if (!(srv->expat = XML_ParserCreate(NULL)))
 269                         error("Error creating XML parser");
 270                 XML_SetUserData(srv->expat, srv);
 271                 XML_SetStartElementHandler(srv->expat, on_start);
 272                 XML_SetEndElementHandler(srv->expat, on_end);
 273                 XML_SetCharacterDataHandler(srv->expat, on_data);
 274
 275                 debug("xmpp: connect -> stream");
 276                 srv->state = XMPP_SEND_STREAM;
 277         }
 278         if (srv->state == XMPP_ENCRYPT && !start && !end) {
 279                 net_encrypt(&srv->net);
 280
 281                 if (!(XML_ParserReset(srv->expat, NULL)))
 282                         error("Error resetting XML parser");
 283                 XML_SetUserData(srv->expat, srv);
 284                 XML_SetStartElementHandler(srv->expat, on_start);
 285                 XML_SetEndElementHandler(srv->expat, on_end);
 286                 XML_SetCharacterDataHandler(srv->expat, on_data);
 287
 288                 debug("xmpp: encrypt -> stream");
 289                 srv->state = XMPP_SEND_STREAM;
 290         }
 291         if (srv->state == XMPP_RESTART && !start && !end) {
 292                 if (!(XML_ParserReset(srv->expat, NULL)))
 293                         error("Error resetting XML parser");
 294                 XML_SetUserData(srv->expat, srv);
 295                 XML_SetStartElementHandler(srv->expat, on_start);
 296                 XML_SetEndElementHandler(srv->expat, on_end);
 297                 XML_SetCharacterDataHandler(srv->expat, on_data);
 298
 299                 debug("xmpp: restart -> stream");
 300                 srv->state = XMPP_SEND_STREAM;
 301         }
 302
 303         /* Stream Start */
 304         if (srv->state == XMPP_SEND_STREAM) {
 305                 if (net_print(&srv->net,
 306                     "<?xml version='1.0'?>"
 307                     "<stream:stream"
 308                     " from='%s'"
 309                     " to='%s'"
 310                     " version='1.0'"
 311                     " xml:lang='en'"
 312                     " xmlns='jabber:client'"
 313                     " xmlns:stream='http://etherx.jabber.org/streams'>",
 314                     srv->jid, srv->host)) {
 315                         debug("xmpp: stream -> features");
 316                         srv->state = XMPP_RECV_FEATURES;
 317                 }
 318         }
 319         if (srv->state == XMPP_RECV_FEATURES) {
 320                 if (match(start, "starttls")) {
 321                         debug("xmpp: features -> starttls");
 322                         srv->state = XMPP_SEND_STARTTLS;
 323                 }
 324                 if (match(start, "mechanisms")) {
 325                         debug("xmpp: features -> auth");
 326                         srv->state = XMPP_SEND_AUTH;
 327                 }
 328                 if (match(start, "bind")) {
 329                         debug("xmpp: features -> bind");
 330                         srv->state = XMPP_SEND_BIND;
 331                 }
 332         }
 333
 334         /* Start TLS */
 335         if (srv->state == XMPP_SEND_STARTTLS) {
 336                 if (net_print(&srv->net,
 337                     "<starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>")) {
 338                         debug("xmpp: startls -> proceed");
 339                         srv->state = XMPP_RECV_PROCEED;
 340                 }
 341         }
 342         if (srv->state == XMPP_RECV_PROCEED) {
 343                 if (match(start, "proceed")) {
 344                         debug("xmpp: proceed -> encrypt");
 345                         srv->state = XMPP_ENCRYPT;
 346                 }
 347         }
 348
 349         /* Authentication */
 350         if (srv->state == XMPP_SEND_AUTH) {
 351                 static char plain[AUTH_LEN];
 352                 static char coded[AUTH_LEN];
 353                 int len;
 354                 len = snprintf(plain, AUTH_LEN, "%s%c%s%c%s",
 355                                 srv->user, '\0', srv->user, '\0', srv->pass);
 356                 len = base64(plain, len, coded, AUTH_LEN);
 357                 if (net_print(&srv->net,
 358                     "<auth"
 359                     " xmlns='urn:ietf:params:xml:ns:xmpp-sasl'"
 360                     " mechanism='PLAIN'>%.*s</auth>",
 361                         len, coded)) {
 362                         debug("xmpp: auth -> success");
 363                         srv->state = XMPP_RECV_SUCCESS;
 364                 }
 365         }
 366         if (srv->state == XMPP_RECV_SUCCESS) {
 367                 if (match(start, "success")) {
 368                         debug("xmpp: success -> restart");
 369                         srv->state = XMPP_RESTART;
 370                 }
 371         }
 372
 373         /* Binding */
 374         if (srv->state == XMPP_SEND_BIND) {
 375                 const char *resource = srv->jid;
 376                 while (*resource && *resource != '/')
 377                         resource++;
 378                 while (*resource && *resource == '/')
 379                         resource++;
 380                 if (net_print(&srv->net,
 381                     "<iq id='bind' type='set'>"
 382                     "<bind xmlns='urn:ietf:params:xml:ns:xmpp-bind'>"
 383                     "<resource>%s</resource>"
 384                     "</bind>"
 385                     "</iq>",
 386                     resource)) {
 387                         debug("xmpp: bind -> jid");
 388                         srv->state = XMPP_RECV_JID;
 389                 }
 390         }
 391         if (srv->state == XMPP_RECV_JID) {
 392                 if (match(start, "jid")) {
 393                         debug("xmpp: jid -> presence");
 394                         srv->state = XMPP_SEND_PRESENCE;
 395                 }
 396         }
 397         if (srv->state == XMPP_SEND_PRESENCE) {
 398                 for (channel_t *cur = channels; cur; cur = cur->next) {
 399                         xmpp_channel_t *chan = (xmpp_channel_t*)cur;
 400                         if (cur->server != &srv->server || !chan->join)
 401                                 continue;
 402                         net_print(&srv->net,
 403                                 "<presence id='join' from='%s' to='%s/%s'>"
 404                                 "<x xmlns='http://jabber.org/protocol/muc'/>"
 405                                 "</presence>",
 406                                 srv->jid, chan->dest, srv->nick);
 407                 }
 408                 srv->state = XMPP_READY;
 409         }
 410
 411         /* Start message */
 412         if (srv->state == XMPP_READY) {
 413                 srv->state = match(start, "iq")       ? XMPP_IN_IQ       :
 414                              match(start, "message")  ? XMPP_IN_MESSAGE  :
 415                              match(start, "presence") ? XMPP_IN_PRESENCE :
 416                                                         XMPP_READY;
 417                 if (srv->state != XMPP_READY) {
 418                         strncpy(srv->msg_jid, find_attr(attrs, "from"), JID_LEN);
 419                         split_jid(srv->msg_jid, srv->msg_usr,
 420                                   srv->msg_srv, srv->msg_res);
 421
 422                         if (match(srv->msg_srv, srv->muc)) {
 423                                 srv->msg_from = srv->msg_res[0] ? srv->msg_res : NULL;
 424                                 srv->msg_chan = find_dest(srv, srv->msg_jid, 1);
 425                         } else {
 426                                 srv->msg_from = srv->msg_usr[0] ? srv->msg_usr : NULL;
 427                                 srv->msg_chan = find_dest(srv, srv->msg_jid, 0);
 428                         }
 429
 430                         debug("xmpp: %s -- jid=[%s] from=[%s] chan=[%s]",
 431                                 start,
 432                                 srv->msg_jid, srv->msg_from,
 433                                 srv->msg_chan->channel.name);
 434                 }
 435         }
 436         if (srv->state == XMPP_IN_IQ ||
 437             srv->state == XMPP_IN_MESSAGE ||
 438             srv->state == XMPP_IN_PRESENCE) {
 439                 if (srv->msg_chan && srv->msg_chan != &srv->system)
 440                         chan = srv->msg_chan;
 441         }
 442
 443         /* Info/Queries */
 444         if (srv->state == XMPP_IN_IQ) {
 445                 if (match(start, "item") && chan) {
 446                         static char res[JID_LEN];
 447                         split_jid(find_attr(attrs, "jid"),
 448                                   NULL, NULL, res);
 449                         chan_notice(chan, "user: %s", res);
 450                 }
 451                 if (match(start, "item") && !chan) {
 452                         srv_notice(srv, "item: [%s] %s",
 453                                         find_attr(attrs, "jid"),
 454                                         find_attr(attrs, "name"));
 455                 }
 456                 if (match(start, "identity")) {
 457                         srv_notice(srv, "identity: %s",
 458                                         find_attr(attrs, "name"));
 459                 }
 460                 if (match(start, "feature")) {
 461                         srv_notice(srv, "feature: %s",
 462                                         find_attr(attrs, "var"));
 463                 }
 464                 if (match(start, "field")) {
 465                         debug("xmpp: %s -- type=[%s] label=[%s]", end,
 466                                 find_attr(attrs, "type"),
 467                                 find_attr(attrs, "label"));
 468                         if (!find_attr(attrs, "label"))
 469                                 return;
 470                         chan_notice(chan, "%-36s -- %s (%s)",
 471                                 find_attr(attrs, "var"),
 472                                 find_attr(attrs, "label"),
 473                                 find_attr(attrs, "type"));
 474                 }
 475                 if (match(end, "title")) {
 476                         debug("xmpp: title -- jid=[%s]",
 477                                 end, srv->msg_jid);
 478                         chan_notice(chan, "Title: %s", data);
 479                 }
 480                 if (match(end, "instructions")) {
 481                         debug("xmpp: instructions -- jid=[%s]",
 482                                 end, srv->msg_jid);
 483                         chan_notice(chan, "%s", data);
 484                 }
 485         }
 486
 487         /* Messages */
 488         if (srv->state == XMPP_IN_MESSAGE) {
 489                 if (match(start, "delay")) {
 490                         const char *ts = find_attr(attrs, "stamp");
 491                         if (ts) {
 492                                 struct tm tm = {};
 493                                 strptime(ts, "%Y-%m-%dT%H:%M:%S%z", &tm);
 494                                 srv->stamp = mktime(&tm);
 495                         }
 496                 }
 497                 if (match(end, "body")) {
 498                         strset(&srv->body, data);
 499                 }
 500                 if (match(end, "message")) {
 501                         debug("xmpp: body (%s) -- chan=[%s] jid=[%s] from=[%s]",
 502                                 srv->msg_from == srv->msg_usr ? "user" : "chat" ,
 503                                 srv->msg_chan->channel.name,
 504                                 srv->msg_jid, srv->msg_from);
 505                         if (srv->body) {
 506                                 chat_recv(&chan->channel, srv->msg_from, srv->body);
 507                                 message_t *msg = &messages[history-1];
 508                                 msg->when = srv->stamp ?: msg->when;
 509                         }
 510                         srv->stamp = 0;
 511                         strset(&srv->body, NULL);
 512                 }
 513         }
 514
 515         /* Presence */
 516         if (srv->state == XMPP_IN_PRESENCE) {
 517                 static char alias[JID_LEN];
 518                 const char *jid;
 519                 if (match(start, "item")) {
 520                         if ((jid = find_attr(attrs, "jid")))
 521                                 strncpy(alias, jid, JID_LEN);
 522                 }
 523                 if (match(end, "presence") && chan) {
 524                         if (alias[0] && !srv->quiet)
 525                                 chan_notice(chan, "%s (%s) entered room.",
 526                                                 srv->msg_from, alias);
 527                         else if (!srv->quiet)
 528                                 chan_notice(chan, "%s entered room.",
 529                                                 srv->msg_from);
 530                         alias[0] = '\0';
 531                 }
 532         }
 533
 534         /* End messages */
 535         if (srv->state == XMPP_IN_IQ ||
 536             srv->state == XMPP_IN_MESSAGE ||
 537             srv->state == XMPP_IN_PRESENCE) {
 538                 if (match(end, "iq") ||
 539                     match(end, "message") ||
 540                     match(end, "presence")) {
 541                         srv->state = XMPP_READY;
 542
 543                         srv->msg_jid[0] = '\0';
 544                         srv->msg_usr[0] = '\0';
 545                         srv->msg_srv[0] = '\0';
 546                         srv->msg_res[0] = '\0';
 547                         srv->msg_from   = NULL;
 548                         srv->msg_chan   = NULL;
 549                 }
 550         }
 551         /* Error handling */
 552         if (match(start, "stream:error"))
 553                 srv->in_error = 1;
 554         if (match(end, "stream:error"))
 555                 srv->in_error = 0;
 556         if (srv->in_error) {
 557                 if (match(end, "text")) {
 558                         debug("xmpp: error: %s", data);
 559                         srv_notice(srv, "error: %s", data);
 560                 }
 561         }
 562 }
 563
 564 /* XMPP functions */
 565 void xmpp_init(void)
 566 {
 567         for (server_t *cur = servers; cur; cur = cur->next) {
 568                 if (cur->protocol != XMPP)
 569                         continue;
 570
 571                 xmpp_server_t *srv = (xmpp_server_t*)cur;
 572                 srv->system.channel.server = &srv->server;
 573                 srv->system.channel.name   = srv->server.name;
 574                 srv_notice(srv, "XMPP Server: %s", srv->server.name);
 575
 576                 if (!srv->port)
 577                         srv->port = 5222;
 578                 if (!srv->jid)
 579                         error("jid is required");
 580                 if (srv->connect)
 581                         xmpp_run(srv, NULL, NULL, NULL, NULL);
 582         }
 583         for (channel_t *cur = channels; cur; cur = cur->next) {
 584                 if (cur->server->protocol != XMPP)
 585                         continue;
 586
 587                 xmpp_channel_t *chan = (xmpp_channel_t*)cur;
 588                 xmpp_server_t *srv = (xmpp_server_t*)cur->server;
 589                 if (!chan->room)
 590                         chan->room = strcopy(cur->name);
 591                 snprintf(chan->dest, JID_LEN, "%s@%s",
 592                          chan->room, srv->muc);
 593         }
 594 }
 595
 596 server_t *xmpp_server(void)
 597 {
 598         return new0(xmpp_server_t);
 599 }
 600
 601 channel_t *xmpp_channel(void)
 602 {
 603         return new0(xmpp_channel_t);
 604 }
 605
 606 void xmpp_config(server_t *server, channel_t *channel,
 607                  const char *group, const char *name,
 608                  const char *key, const char *value)
 609 {
 610         xmpp_server_t  *srv  = (xmpp_server_t*)server;
 611         xmpp_channel_t *chan = (xmpp_channel_t*)channel;
 612
 613         if (server) {
 614                 if (match(key, "connect"))
 615                         srv->connect = get_bool(value);
 616                 else if (match(key, "host"))
 617                         srv->host = get_string(value);
 618                 else if (match(key, "port"))
 619                         srv->port = get_number(value);
 620                 else if (match(key, "muc"))
 621                         srv->muc = get_string(value);
 622                 else if (match(key, "nick"))
 623                         srv->nick = get_string(value);
 624                 else if (match(key, "jid"))
 625                         srv->jid = get_string(value);
 626                 else if (match(key, "user"))
 627                         srv->user = get_string(value);
 628                 else if (match(key, "pass"))
 629                         srv->pass = get_string(value);
 630                 else if (match(key, "quiet"))
 631                         srv->quiet = get_bool(value);
 632         }
 633         if (channel) {
 634                 if (match(key, "room"))
 635                         chan->room = get_string(value);
 636                 else if (match(key, "join"))
 637                         chan->join = get_bool(value);
 638         }
 639 }
 640
 641 void xmpp_send(channel_t *channel, const char *text)
 642 {
 643         xmpp_channel_t *chan = (xmpp_channel_t*)channel;
 644         xmpp_server_t  *srv  = (xmpp_server_t*)channel->server;
 645         const char *arg;
 646
 647         /* Handle commands */
 648         if (text[0] == '/') {
 649                 if (prefix(text, "/items", &arg)) {
 650                         net_print(&srv->net,
 651                                 "<iq id='items' type='get' from='%s' to='%s'>"
 652                                 "<query xmlns='http://jabber.org/protocol/disco#items'/>"
 653                                 "</iq>",
 654                                 srv->jid, arg ?: srv->host);
 655                 }
 656                 else if (prefix(text, "/info", &arg)) {
 657                         net_print(&srv->net,
 658                                 "<iq id='info' type='get' from='%s' to='%s'>"
 659                                 "<query xmlns='http://jabber.org/protocol/disco#info'/>"
 660                                 "</iq>",
 661                                 srv->jid, arg ?: srv->host);
 662                 }
 663                 else if (prefix(text, "/names", &arg)) {
 664                         if (arg)
 665                                 chan = find_dest(srv, arg, 1);
 666                         if (chan == &srv->system) {
 667                                 chan_notice(chan, "Cannot get names from server");
 668                                 return;
 669                         }
 670                         net_print(&srv->net,
 671                                 "<iq id='list' type='get' from='%s' to='%s'>"
 672                                 "<query xmlns='http://jabber.org/protocol/disco#items'/>"
 673                                 "</iq>",
 674                                 srv->jid, chan->dest);
 675                 }
 676                 else if (prefix(text, "/join", &arg)) {
 677                         if (!arg) {
 678                                 chan_notice(chan, "usage: /join <channel>");
 679                                 return;
 680                         }
 681                         net_print(&srv->net,
 682                                 "<presence id='join' from='%s' to='%s/%s'>"
 683                                 "<x xmlns='http://jabber.org/protocol/muc'/>"
 684                                 "</presence>",
 685                                 srv->jid, chan->dest, srv->nick);
 686                         chan = find_dest(srv, arg, 1);
 687                         chan_notice(chan, "Room: %s", arg);
 688                 }
 689                 else if (prefix(text, "/config", &arg)) {
 690                         if (arg) {
 691                                 chan_notice(chan, "Unimplemented: /config <arg>");
 692                                 return;
 693                         }
 694                         net_print(&srv->net,
 695                                 "<iq id='config' type='get' from='%s' to='%s'>"
 696                                 "<query xmlns='http://jabber.org/protocol/muc#owner'/>"
 697                                 "</iq>",
 698                                 srv->jid, chan->dest);
 699                 }
 700                 else if (prefix(text, "/query", &arg)) {
 701                         if (!arg) {
 702                                 chan_notice(chan, "usage: /query <user>");
 703                                 return;
 704                         }
 705                         chan = find_dest(srv, arg, 0);
 706                         chan_notice(chan, "User: %s", arg);
 707                 }
 708                 else {
 709                         chan_notice(chan, "Unknown command %s", text);
 710                 }
 711         } else {
 712                 debug("message: [%s]", text);
 713                 if (chan == &srv->system) {
 714                         chan_notice(chan, "Cannot send to server");
 715                 }
 716                 else if (!chan->dest) {
 717                         chan_notice(chan, "No destination for message");
 718                 }
 719                 else if (chan->room) {
 720                         net_print(&srv->net,
 721                                 "<message id='chat' from='%s' to='%s' type='groupchat'>"
 722                                 "<body>%s</body>"
 723                                 "</message>",
 724                                 srv->jid, chan->dest, text);
 725                 } else {
 726                         net_print(&srv->net,
 727                                 "<message id='chat' from='%s' to='%s'>"
 728                                 "<body>%s</body>"
 729                                 "</message>",
 730                                 srv->jid, chan->dest, text);
 731                         chat_recv(channel, srv->nick, text);
 732                 }
 733         }
 734 }
 735
 736 void xmpp_exit(void)
 737 {
 738 }