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simple.c

/**
 * @file simple.c
 *
 * purple
 *
 * Copyright (C) 2005 Thomas Butter <butter@uni-mannheim.de>
 *
 * ***
 * Thanks to Google's Summer of Code Program and the helpful mentors
 * ***
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA
 */

#include "internal.h"

#include "accountopt.h"
#include "blist.h"
#include "conversation.h"
#include "dnsquery.h"
#include "debug.h"
#include "notify.h"
#include "privacy.h"
#include "prpl.h"
#include "plugin.h"
#include "util.h"
#include "version.h"
#include "network.h"
#include "xmlnode.h"

#include "simple.h"
#include "sipmsg.h"
#include "dnssrv.h"
#include "ntlm.h"

static char *gentag(void) {
      return g_strdup_printf("%04d%04d", rand() & 0xFFFF, rand() & 0xFFFF);
}

static char *genbranch(void) {
      return g_strdup_printf("z9hG4bK%04X%04X%04X%04X%04X",
            rand() & 0xFFFF, rand() & 0xFFFF, rand() & 0xFFFF,
            rand() & 0xFFFF, rand() & 0xFFFF);
}

static char *gencallid(void) {
      return g_strdup_printf("%04Xg%04Xa%04Xi%04Xm%04Xt%04Xb%04Xx%04Xx",
            rand() & 0xFFFF, rand() & 0xFFFF, rand() & 0xFFFF,
            rand() & 0xFFFF, rand() & 0xFFFF, rand() & 0xFFFF,
            rand() & 0xFFFF, rand() & 0xFFFF);
}

static const char *simple_list_icon(PurpleAccount *a, PurpleBuddy *b) {
      return "simple";
}

static void simple_keep_alive(PurpleConnection *gc) {
      struct simple_account_data *sip = gc->proto_data;
      if(sip->udp) { /* in case of UDP send a packet only with a 0 byte to
                   remain in the NAT table */
            gchar buf[2] = {0, 0};
            purple_debug_info("simple", "sending keep alive\n");
            sendto(sip->fd, buf, 1, 0, (struct sockaddr*)&sip->serveraddr, sizeof(struct sockaddr_in));
      }
      return;
}

static gboolean process_register_response(struct simple_account_data *sip, struct sipmsg *msg, struct transaction *tc);
static void send_notify(struct simple_account_data *sip, struct simple_watcher *);

static void send_open_publish(struct simple_account_data *sip);
static void send_closed_publish(struct simple_account_data *sip);

static void do_notifies(struct simple_account_data *sip) {
      GSList *tmp = sip->watcher;
      purple_debug_info("simple", "do_notifies()\n");
      if((sip->republish != -1) || sip->republish < time(NULL)) {
            if(purple_account_get_bool(sip->account, "dopublish", TRUE)) {
                  send_open_publish(sip);
            }
      }

      while(tmp) {
            purple_debug_info("simple", "notifying %s\n", ((struct simple_watcher*)tmp->data)->name);
            send_notify(sip, tmp->data);
            tmp = tmp->next;
      }
}

static void simple_set_status(PurpleAccount *account, PurpleStatus *status) {
      PurpleStatusPrimitive primitive = purple_status_type_get_primitive(purple_status_get_type(status));
      struct simple_account_data *sip = NULL;

      if (!purple_status_is_active(status))
            return;

      if (account->gc)
            sip = account->gc->proto_data;

      if (sip)
      {
            g_free(sip->status);
            if (primitive == PURPLE_STATUS_AVAILABLE)
                  sip->status = g_strdup("available");
            else
                  sip->status = g_strdup("busy");

            do_notifies(sip);
      }
}

static struct sip_connection *connection_find(struct simple_account_data *sip, int fd) {
      struct sip_connection *ret = NULL;
      GSList *entry = sip->openconns;
      while(entry) {
            ret = entry->data;
            if(ret->fd == fd) return ret;
            entry = entry->next;
      }
      return NULL;
}

static struct simple_watcher *watcher_find(struct simple_account_data *sip,
            const gchar *name) {
      struct simple_watcher *watcher;
      GSList *entry = sip->watcher;
      while(entry) {
            watcher = entry->data;
            if(!strcmp(name, watcher->name)) return watcher;
            entry = entry->next;
      }
      return NULL;
}

static struct simple_watcher *watcher_create(struct simple_account_data *sip,
            const gchar *name, const gchar *callid, const gchar *ourtag,
            const gchar *theirtag, gboolean needsxpidf) {
      struct simple_watcher *watcher = g_new0(struct simple_watcher, 1);
      watcher->name = g_strdup(name);
      watcher->dialog.callid = g_strdup(callid);
      watcher->dialog.ourtag = g_strdup(ourtag);
      watcher->dialog.theirtag = g_strdup(theirtag);
      watcher->needsxpidf = needsxpidf;
      sip->watcher = g_slist_append(sip->watcher, watcher);
      return watcher;
}

static void watcher_remove(struct simple_account_data *sip, const gchar *name) {
      struct simple_watcher *watcher = watcher_find(sip, name);
      sip->watcher = g_slist_remove(sip->watcher, watcher);
      g_free(watcher->name);
      g_free(watcher->dialog.callid);
      g_free(watcher->dialog.ourtag);
      g_free(watcher->dialog.theirtag);
      g_free(watcher);
}

static struct sip_connection *connection_create(struct simple_account_data *sip, int fd) {
      struct sip_connection *ret = g_new0(struct sip_connection, 1);
      ret->fd = fd;
      sip->openconns = g_slist_append(sip->openconns, ret);
      return ret;
}

static void connection_remove(struct simple_account_data *sip, int fd) {
      struct sip_connection *conn = connection_find(sip, fd);
      sip->openconns = g_slist_remove(sip->openconns, conn);
      if(conn->inputhandler) purple_input_remove(conn->inputhandler);
      g_free(conn->inbuf);
      g_free(conn);
}

static void connection_free_all(struct simple_account_data *sip) {
      struct sip_connection *ret = NULL;
      GSList *entry = sip->openconns;
      while(entry) {
            ret = entry->data;
            connection_remove(sip, ret->fd);
            entry = sip->openconns;
      }
}

static void simple_add_buddy(PurpleConnection *gc, PurpleBuddy *buddy, PurpleGroup *group)
{
      struct simple_account_data *sip = (struct simple_account_data *)gc->proto_data;
      struct simple_buddy *b;
      const char *name = purple_buddy_get_name(buddy);
      if(strncmp(name, "sip:", 4)) {
            gchar *buf = g_strdup_printf("sip:%s", name);
            purple_blist_rename_buddy(buddy, buf);
            g_free(buf);
      }
      if(!g_hash_table_lookup(sip->buddies, name)) {
            b = g_new0(struct simple_buddy, 1);
            purple_debug_info("simple", "simple_add_buddy %s\n", name);
            b->name = g_strdup(name);
            g_hash_table_insert(sip->buddies, b->name, b);
      } else {
            purple_debug_info("simple", "buddy %s already in internal list\n", name);
      }
}

static void simple_get_buddies(PurpleConnection *gc) {
      GSList *buddies;
      PurpleAccount *account;

      purple_debug_info("simple", "simple_get_buddies\n");

      account = purple_connection_get_account(gc);
      buddies = purple_find_buddies(account, NULL);
      while (buddies) {
            PurpleBuddy *buddy = buddies->data;
            simple_add_buddy(gc, buddy, purple_buddy_get_group(buddy));

            buddies = g_slist_delete_link(buddies, buddies);
      }
}

static void simple_remove_buddy(PurpleConnection *gc, PurpleBuddy *buddy, PurpleGroup *group)
{
      const char *name = purple_buddy_get_name(buddy);
      struct simple_account_data *sip = (struct simple_account_data *)gc->proto_data;
      struct simple_buddy *b = g_hash_table_lookup(sip->buddies, name);
      g_hash_table_remove(sip->buddies, name);
      g_free(b->name);
      g_free(b);
}

static GList *simple_status_types(PurpleAccount *acc) {
      PurpleStatusType *type;
      GList *types = NULL;

      type = purple_status_type_new_with_attrs(
            PURPLE_STATUS_AVAILABLE, NULL, NULL, TRUE, TRUE, FALSE,
            "message", _("Message"), purple_value_new(PURPLE_TYPE_STRING),
            NULL);
      types = g_list_append(types, type);

      type = purple_status_type_new_full(
            PURPLE_STATUS_OFFLINE, NULL, NULL, TRUE, TRUE, FALSE);
      types = g_list_append(types, type);

      return types;
}

static gchar *auth_header(struct simple_account_data *sip,
            struct sip_auth *auth, const gchar *method, const gchar *target) {
      gchar noncecount[9];
      gchar *response;
      gchar *ret;
      gchar *tmp;
      const char *authdomain;
      const char *authuser;

      authdomain = purple_account_get_string(sip->account, "authdomain", "");
      authuser = purple_account_get_string(sip->account, "authuser", sip->username);

      if(!authuser || strlen(authuser) < 1) {
            authuser = sip->username;
      }

      if(auth->type == 1) { /* Digest */
            sprintf(noncecount, "%08d", auth->nc++);
            response = purple_cipher_http_digest_calculate_response(
                                          "md5", method, target, NULL, NULL,
                                          auth->nonce, noncecount, NULL, auth->digest_session_key);
            purple_debug(PURPLE_DEBUG_MISC, "simple", "response %s\n", response);

            ret = g_strdup_printf("Digest username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", nc=\"%s\", response=\"%s\"", authuser, auth->realm, auth->nonce, target, noncecount, response);
            g_free(response);
            return ret;
      } else if(auth->type == 2) { /* NTLM */
            if(auth->nc == 3 && auth->nonce) {
                  /* TODO: Don't hardcode "purple" as the hostname */
                  ret = purple_ntlm_gen_type3(authuser, sip->password, "purple", authdomain, (const guint8 *)auth->nonce, &auth->flags);
                  tmp = g_strdup_printf("NTLM qop=\"auth\", opaque=\"%s\", realm=\"%s\", targetname=\"%s\", gssapi-data=\"%s\"", auth->opaque, auth->realm, auth->target, ret);
                  g_free(ret);
                  return tmp;
            }
            tmp = g_strdup_printf("NTLM qop=\"auth\", realm=\"%s\", targetname=\"%s\", gssapi-data=\"\"", auth->realm, auth->target);
            return tmp;
      }

      sprintf(noncecount, "%08d", auth->nc++);
      response = purple_cipher_http_digest_calculate_response(
                                    "md5", method, target, NULL, NULL,
                                    auth->nonce, noncecount, NULL, auth->digest_session_key);
      purple_debug(PURPLE_DEBUG_MISC, "simple", "response %s\n", response);

      ret = g_strdup_printf("Digest username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", nc=\"%s\", response=\"%s\"", authuser, auth->realm, auth->nonce, target, noncecount, response);
      g_free(response);
      return ret;
}

static char *parse_attribute(const char *attrname, const char *source) {
      const char *tmp, *tmp2;
      char *retval = NULL;
      int len = strlen(attrname);

      /* we know that source is NULL-terminated.
       * Therefore this loop won't be infinite.
       */
      while (source[0] == ' ')
            source++;

      if(!strncmp(source, attrname, len)) {
            tmp = source + len;
            tmp2 = g_strstr_len(tmp, strlen(tmp), "\"");
            if(tmp2)
                  retval = g_strndup(tmp, tmp2 - tmp);
            else
                  retval = g_strdup(tmp);
      }

      return retval;
}

static void fill_auth(struct simple_account_data *sip, const gchar *hdr, struct sip_auth *auth) {
      int i = 0;
      const char *authuser;
      char *tmp;
      gchar **parts;

      authuser = purple_account_get_string(sip->account, "authuser", sip->username);

      if(!authuser || strlen(authuser) < 1) {
            authuser = sip->username;
      }

      if(!hdr) {
            purple_debug_error("simple", "fill_auth: hdr==NULL\n");
            return;
      }

      if(!g_ascii_strncasecmp(hdr, "NTLM", 4)) {
            purple_debug_info("simple", "found NTLM\n");
            auth->type = 2;
            parts = g_strsplit(hdr+5, "\",", 0);
            i = 0;
            while(parts[i]) {
                  purple_debug_info("simple", "parts[i] %s\n", parts[i]);
                  if((tmp = parse_attribute("gssapi-data=\"", parts[i]))) {
                        auth->nonce = g_memdup(purple_ntlm_parse_type2(tmp, &auth->flags), 8);
                        g_free(tmp);
                  }
                  if((tmp = parse_attribute("targetname=\"",
                              parts[i]))) {
                        auth->target = tmp;
                  }
                  else if((tmp = parse_attribute("realm=\"",
                              parts[i]))) {
                        auth->realm = tmp;
                  }
                  else if((tmp = parse_attribute("opaque=\"", parts[i]))) {
                        auth->opaque = tmp;
                  }
                  i++;
            }
            g_strfreev(parts);
            auth->nc = 1;
            if(!strstr(hdr, "gssapi-data")) {
                  auth->nc = 1;
            } else {
                  auth->nc = 3;
            }

            return;
      } else if(!g_ascii_strncasecmp(hdr, "DIGEST", 6)) {

            purple_debug_info("simple", "found DIGEST\n");

            auth->type = 1;
            parts = g_strsplit(hdr+7, ",", 0);
            while(parts[i]) {
                  if((tmp = parse_attribute("nonce=\"", parts[i]))) {
                        auth->nonce = tmp;
                  }
                  else if((tmp = parse_attribute("realm=\"", parts[i]))) {
                        auth->realm = tmp;
                  }
                  i++;
            }
            g_strfreev(parts);
            purple_debug(PURPLE_DEBUG_MISC, "simple", "nonce: %s realm: %s\n",
                               auth->nonce ? auth->nonce : "(null)",
                               auth->realm ? auth->realm : "(null)"); 

            if(auth->realm) {
                  auth->digest_session_key = purple_cipher_http_digest_calculate_session_key(
                        "md5", authuser, auth->realm, sip->password, auth->nonce, NULL);

                  auth->nc = 1;
            }

      } else {
            purple_debug_error("simple", "Unsupported or bad WWW-Authenticate header (%s).\n", hdr);
      }

}

static void simple_canwrite_cb(gpointer data, gint source, PurpleInputCondition cond) {
      PurpleConnection *gc = data;
      struct simple_account_data *sip = gc->proto_data;
      gsize max_write;
      gssize written;

      max_write = purple_circ_buffer_get_max_read(sip->txbuf);

      if(max_write == 0) {
            purple_input_remove(sip->tx_handler);
            sip->tx_handler = 0;
            return;
      }

      written = write(sip->fd, sip->txbuf->outptr, max_write);

      if(written < 0 && errno == EAGAIN)
            written = 0;
      else if (written <= 0) {
            /*TODO: do we really want to disconnect on a failure to write?*/
            gchar *tmp = g_strdup_printf(_("Lost connection with server: %s"),
                        g_strerror(errno));
            purple_connection_error_reason(gc,
                  PURPLE_CONNECTION_ERROR_NETWORK_ERROR, tmp);
            g_free(tmp);
            return;
      }

      purple_circ_buffer_mark_read(sip->txbuf, written);
}

static void simple_input_cb(gpointer data, gint source, PurpleInputCondition cond);

static void send_later_cb(gpointer data, gint source, const gchar *error_message) {
      PurpleConnection *gc = data;
      struct simple_account_data *sip;
      struct sip_connection *conn;

      if(source < 0) {
            gchar *tmp = g_strdup_printf(_("Unable to connect: %s"),
                        error_message);
            purple_connection_error_reason(gc,
                  PURPLE_CONNECTION_ERROR_NETWORK_ERROR, tmp);
            g_free(tmp);
            return;
      }

      sip = gc->proto_data;
      sip->fd = source;
      sip->connecting = FALSE;

      simple_canwrite_cb(gc, sip->fd, PURPLE_INPUT_WRITE);

      /* If there is more to write now, we need to register a handler */
      if(sip->txbuf->bufused > 0)
            sip->tx_handler = purple_input_add(sip->fd, PURPLE_INPUT_WRITE,
                  simple_canwrite_cb, gc);

      conn = connection_create(sip, source);
      conn->inputhandler = purple_input_add(sip->fd, PURPLE_INPUT_READ, simple_input_cb, gc);
}


static void sendlater(PurpleConnection *gc, const char *buf) {
      struct simple_account_data *sip = gc->proto_data;

      if(!sip->connecting) {
            purple_debug_info("simple", "connecting to %s port %d\n", sip->realhostname ? sip->realhostname : "{NULL}", sip->realport);
            if (purple_proxy_connect(gc, sip->account, sip->realhostname, sip->realport, send_later_cb, gc) == NULL) {
                  purple_connection_error_reason(gc, PURPLE_CONNECTION_ERROR_NETWORK_ERROR, _("Unable to connect"));
            }
            sip->connecting = TRUE;
      }

      if(purple_circ_buffer_get_max_read(sip->txbuf) > 0)
            purple_circ_buffer_append(sip->txbuf, "\r\n", 2);

      purple_circ_buffer_append(sip->txbuf, buf, strlen(buf));
}

static void sendout_pkt(PurpleConnection *gc, const char *buf) {
      struct simple_account_data *sip = gc->proto_data;
      time_t currtime = time(NULL);
      int writelen = strlen(buf);

      purple_debug(PURPLE_DEBUG_MISC, "simple", "\n\nsending - %s\n######\n%s\n######\n\n", ctime(&currtime), buf);
      if(sip->udp) {
            if(sendto(sip->fd, buf, writelen, 0, (struct sockaddr*)&sip->serveraddr, sizeof(struct sockaddr_in)) < writelen) {
                  purple_debug_info("simple", "could not send packet\n");
            }
      } else {
            int ret;
            if(sip->fd < 0) {
                  sendlater(gc, buf);
                  return;
            }

            if(sip->tx_handler) {
                  ret = -1;
                  errno = EAGAIN;
            } else
                  ret = write(sip->fd, buf, writelen);

            if (ret < 0 && errno == EAGAIN)
                  ret = 0;
            else if(ret <= 0) { /* XXX: When does this happen legitimately? */
                  sendlater(gc, buf);
                  return;
            }

            if (ret < writelen) {
                  if(!sip->tx_handler)
                        sip->tx_handler = purple_input_add(sip->fd,
                              PURPLE_INPUT_WRITE, simple_canwrite_cb,
                              gc);

                  /* XXX: is it OK to do this? You might get part of a request sent
                     with part of another. */
                  if(sip->txbuf->bufused > 0)
                        purple_circ_buffer_append(sip->txbuf, "\r\n", 2);

                  purple_circ_buffer_append(sip->txbuf, buf + ret,
                        writelen - ret);
            }
      }
}

static int simple_send_raw(PurpleConnection *gc, const char *buf, int len)
{
      sendout_pkt(gc, buf);
      return len;
}

static void sendout_sipmsg(struct simple_account_data *sip, struct sipmsg *msg) {
      GSList *tmp = msg->headers;
      gchar *name;
      gchar *value;
      GString *outstr = g_string_new("");
      g_string_append_printf(outstr, "%s %s SIP/2.0\r\n", msg->method, msg->target);
      while(tmp) {
            name = ((struct siphdrelement*) (tmp->data))->name;
            value = ((struct siphdrelement*) (tmp->data))->value;
            g_string_append_printf(outstr, "%s: %s\r\n", name, value);
            tmp = g_slist_next(tmp);
      }
      g_string_append_printf(outstr, "\r\n%s", msg->body ? msg->body : "");
      sendout_pkt(sip->gc, outstr->str);
      g_string_free(outstr, TRUE);
}

static void send_sip_response(PurpleConnection *gc, struct sipmsg *msg, int code,
            const char *text, const char *body) {
      GSList *tmp = msg->headers;
      gchar *name;
      gchar *value;
      GString *outstr = g_string_new("");

      /* When sending the acknowlegements and errors, the content length from the original
         message is still here, but there is no body; we need to make sure we're sending the
         correct content length */
      sipmsg_remove_header(msg, "Content-Length");
      if(body) {
            gchar len[12];
            sprintf(len, "%" G_GSIZE_FORMAT , strlen(body));
            sipmsg_add_header(msg, "Content-Length", len);
      }
      else
            sipmsg_add_header(msg, "Content-Length", "0");
      g_string_append_printf(outstr, "SIP/2.0 %d %s\r\n", code, text);
      while(tmp) {
            name = ((struct siphdrelement*) (tmp->data))->name;
            value = ((struct siphdrelement*) (tmp->data))->value;

            g_string_append_printf(outstr, "%s: %s\r\n", name, value);
            tmp = g_slist_next(tmp);
      }
      g_string_append_printf(outstr, "\r\n%s", body ? body : "");
      sendout_pkt(gc, outstr->str);
      g_string_free(outstr, TRUE);
}

static void transactions_remove(struct simple_account_data *sip, struct transaction *trans) {
      if(trans->msg) sipmsg_free(trans->msg);
      sip->transactions = g_slist_remove(sip->transactions, trans);
      g_free(trans);
}

static void transactions_add_buf(struct simple_account_data *sip, const gchar *buf, void *callback) {
      struct transaction *trans = g_new0(struct transaction, 1);
      trans->time = time(NULL);
      trans->msg = sipmsg_parse_msg(buf);
      trans->cseq = sipmsg_find_header(trans->msg, "CSeq");
      trans->callback = callback;
      sip->transactions = g_slist_append(sip->transactions, trans);
}

static struct transaction *transactions_find(struct simple_account_data *sip, struct sipmsg *msg) {
      struct transaction *trans;
      GSList *transactions = sip->transactions;
      const gchar *cseq = sipmsg_find_header(msg, "CSeq");

      if (cseq) {
            while(transactions) {
                  trans = transactions->data;
                  if(!strcmp(trans->cseq, cseq)) {
                        return trans;
                  }
                  transactions = transactions->next;
            }
      } else {
            purple_debug(PURPLE_DEBUG_MISC, "simple", "Received message contains no CSeq header.\n");
      }

      return NULL;
}

static void send_sip_request(PurpleConnection *gc, const gchar *method,
            const gchar *url, const gchar *to, const gchar *addheaders,
            const gchar *body, struct sip_dialog *dialog, TransCallback tc) {
      struct simple_account_data *sip = gc->proto_data;
      char *callid = dialog ? g_strdup(dialog->callid) : gencallid();
      char *auth = NULL;
      const char *addh = "";
      gchar *branch = genbranch();
      gchar *tag = NULL;
      char *buf;

      if(!strcmp(method, "REGISTER")) {
            if(sip->regcallid) {
                  g_free(callid);
                  callid = g_strdup(sip->regcallid);
            }
            else sip->regcallid = g_strdup(callid);
      }

      if(addheaders) addh = addheaders;
      if(sip->registrar.type && !strcmp(method, "REGISTER")) {
            buf = auth_header(sip, &sip->registrar, method, url);
            auth = g_strdup_printf("Authorization: %s\r\n", buf);
            g_free(buf);
            purple_debug(PURPLE_DEBUG_MISC, "simple", "header %s", auth);
      } else if(sip->proxy.type && strcmp(method, "REGISTER")) {
            buf = auth_header(sip, &sip->proxy, method, url);
            auth = g_strdup_printf("Proxy-Authorization: %s\r\n", buf);
            g_free(buf);
            purple_debug(PURPLE_DEBUG_MISC, "simple", "header %s", auth);
      }

      if (!dialog)
            tag = gentag();

      buf = g_strdup_printf("%s %s SIP/2.0\r\n"
                  "Via: SIP/2.0/%s %s:%d;branch=%s\r\n"
                  /* Don't know what epid is, but LCS wants it */
                  "From: <sip:%s@%s>;tag=%s;epid=1234567890\r\n"
                  "To: <%s>%s%s\r\n"
                  "Max-Forwards: 10\r\n"
                  "CSeq: %d %s\r\n"
                  "User-Agent: Purple/" VERSION "\r\n"
                  "Call-ID: %s\r\n"
                  "%s%s"
                  "Content-Length: %" G_GSIZE_FORMAT "\r\n\r\n%s",
                  method,
                  url,
                  sip->udp ? "UDP" : "TCP",
                  purple_network_get_my_ip(-1),
                  sip->listenport,
                  branch,
                  sip->username,
                  sip->servername,
                  dialog ? dialog->ourtag : tag,
                  to,
                  dialog ? ";tag=" : "",
                  dialog ? dialog->theirtag : "",
                  ++sip->cseq,
                  method,
                  callid,
                  auth ? auth : "",
                  addh,
                  strlen(body),
                  body);

      g_free(tag);
      g_free(auth);
      g_free(branch);
      g_free(callid);

      /* add to ongoing transactions */

      transactions_add_buf(sip, buf, tc);

      sendout_pkt(gc, buf);

      g_free(buf);
}

static char *get_contact(struct simple_account_data  *sip) {
      return g_strdup_printf("<sip:%s@%s:%d;transport=%s>;methods=\"MESSAGE, SUBSCRIBE, NOTIFY\"",
                         sip->username, purple_network_get_my_ip(-1),
                         sip->listenport,
                         sip->udp ? "udp" : "tcp");
}

static void do_register_exp(struct simple_account_data *sip, int expire) {
      char *uri, *to, *contact, *hdr;

      sip->reregister = time(NULL) + expire - 50;

      uri = g_strdup_printf("sip:%s", sip->servername);
      to = g_strdup_printf("sip:%s@%s", sip->username, sip->servername);
      contact = get_contact(sip);
      hdr = g_strdup_printf("Contact: %s\r\nExpires: %d\r\n", contact, expire);
      g_free(contact);

      sip->registerstatus = SIMPLE_REGISTER_SENT;

      send_sip_request(sip->gc, "REGISTER", uri, to, hdr, "", NULL,
            process_register_response);

      g_free(hdr);
      g_free(uri);
      g_free(to);
}

static void do_register(struct simple_account_data *sip) {
      do_register_exp(sip, sip->registerexpire);
}

static gchar *parse_from(const gchar *hdr) {
      gchar *from;
      const gchar *tmp, *tmp2 = hdr;

      if(!hdr) return NULL;
      purple_debug_info("simple", "parsing address out of %s\n", hdr);
      tmp = strchr(hdr, '<');

      /* i hate the different SIP UA behaviours... */
      if(tmp) { /* sip address in <...> */
            tmp2 = tmp + 1;
            tmp = strchr(tmp2, '>');
            if(tmp) {
                  from = g_strndup(tmp2, tmp - tmp2);
            } else {
                  purple_debug_info("simple", "found < without > in From\n");
                  return NULL;
            }
      } else {
            tmp = strchr(tmp2, ';');
            if(tmp) {
                  from = g_strndup(tmp2, tmp - tmp2);
            } else {
                  from = g_strdup(tmp2);
            }
      }
      purple_debug_info("simple", "got %s\n", from);
      return from;
}
static gchar *find_tag(const gchar *);

static gboolean process_subscribe_response(struct simple_account_data *sip, struct sipmsg *msg, struct transaction *tc) {
      gchar *to = NULL;
      struct simple_buddy *b = NULL;
      gchar *theirtag = NULL, *ourtag = NULL;
      const gchar *callid = NULL;

      purple_debug_info("simple", "process subscribe response\n");

      if(msg->response == 200 || msg->response == 202) {
            if ( (to = parse_from(sipmsg_find_header(msg, "To"))) &&
                  (b = g_hash_table_lookup(sip->buddies, to)) &&
                   !(b->dialog))
            {
                  purple_debug_info("simple", "creating dialog"
                        " information for a subscription.\n");

                  theirtag = find_tag(sipmsg_find_header(msg, "To"));
                  ourtag = find_tag(sipmsg_find_header(msg, "From"));
                  callid = sipmsg_find_header(msg, "Call-ID");

                  if (theirtag && ourtag && callid)
                  {
                        b->dialog = g_new0(struct sip_dialog, 1);
                        b->dialog->ourtag = g_strdup(ourtag);
                        b->dialog->theirtag = g_strdup(theirtag);
                        b->dialog->callid = g_strdup(callid);

                        purple_debug_info("simple", "ourtag: %s\n", 
                              ourtag);
                        purple_debug_info("simple", "theirtag: %s\n", 
                              theirtag);
                        purple_debug_info("simple", "callid: %s\n", 
                              callid);
                        g_free(theirtag);
                        g_free(ourtag);
                  }
            }
            else
            {
                  purple_debug_info("simple", "cannot create dialog!\n");
            }
            return TRUE;
      }

      to = parse_from(sipmsg_find_header(tc->msg, "To")); /* cant be NULL since it is our own msg */

      /* we can not subscribe -> user is offline (TODO unknown status?) */

      purple_prpl_got_user_status(sip->account, to, "offline", NULL);
      g_free(to);
      return TRUE;
}

static void simple_subscribe_exp(struct simple_account_data *sip, struct simple_buddy *buddy, int expiration) {
      gchar *contact, *to, *tmp, *tmp2;

      tmp2 = g_strdup_printf(
            "Expires: %d\r\n"
            "Accept: application/pidf+xml, application/xpidf+xml\r\n"
            "Event: presence\r\n",
            expiration);

      if(strncmp(buddy->name, "sip:", 4))
            to = g_strdup_printf("sip:%s", buddy->name);
      else
            to = g_strdup(buddy->name);

      tmp = get_contact(sip);
      contact = g_strdup_printf("%sContact: %s\r\n", tmp2, tmp);
      g_free(tmp);
      g_free(tmp2);

      send_sip_request(sip->gc, "SUBSCRIBE", to, to, contact,"",buddy->dialog,
                   (expiration > 0) ? process_subscribe_response : NULL);

      g_free(to);
      g_free(contact);

      /* resubscribe before subscription expires */
      /* add some jitter */
      if (expiration > 60)
            buddy->resubscribe = time(NULL) + (expiration - 60) + (rand() % 50);
      else if (expiration > 0)
            buddy->resubscribe = time(NULL) + ((int) (expiration / 2));
}

static void simple_subscribe(struct simple_account_data *sip, struct simple_buddy *buddy) {
      simple_subscribe_exp(sip, buddy, SUBSCRIBE_EXPIRATION);
}

static void simple_unsubscribe(char *name, struct simple_buddy *buddy, struct simple_account_data *sip) {
      if (buddy->dialog)
      {
            purple_debug_info("simple", "Unsubscribing from %s\n", name);
            simple_subscribe_exp(sip, buddy, 0);
      }
}

static gboolean simple_add_lcs_contacts(struct simple_account_data *sip, struct sipmsg *msg, struct transaction *tc) {
      const gchar *tmp;
      xmlnode *item, *group, *isc;
      const char *name_group;
      PurpleBuddy *b;
      PurpleGroup *g = NULL;
      struct simple_buddy *bs;
      int len = msg->bodylen;


      tmp = sipmsg_find_header(msg, "Event");
      if(tmp && !strncmp(tmp, "vnd-microsoft-roaming-contacts", 30)){

            purple_debug_info("simple", "simple_add_lcs_contacts->%s-%d\n", msg->body, len);
            /*Convert the contact from XML to Purple Buddies*/
            isc = xmlnode_from_str(msg->body, len);

            /* ToDo. Find for all groups */
            if ((group = xmlnode_get_child(isc, "group"))) {
                  name_group = xmlnode_get_attrib(group, "name");
                  purple_debug_info("simple", "name_group->%s\n", name_group);
                  g = purple_find_group(name_group);
                  if(!g)
                        g = purple_group_new(name_group);
            }

            if (!g) {
                  g = purple_find_group("Buddies");
                  if(!g)
                        g = purple_group_new("Buddies");
            }

            for(item = xmlnode_get_child(isc, "contact"); item; item = xmlnode_get_next_twin(item))
            {
                  const char *uri, *name, *groups;
                  char *buddy_name;
                  uri = xmlnode_get_attrib(item, "uri");
                  name = xmlnode_get_attrib(item, "name");
                  groups = xmlnode_get_attrib(item, "groups");
                  purple_debug_info("simple", "URI->%s\n", uri);

                  buddy_name = g_strdup_printf("sip:%s", uri);

                  b = purple_find_buddy(sip->account, buddy_name);
                  if(!b){
                        b = purple_buddy_new(sip->account, buddy_name, uri);
                  }
                  g_free(buddy_name);

                  purple_blist_add_buddy(b, NULL, g, NULL);
                  purple_blist_alias_buddy(b, uri);
                  bs = g_new0(struct simple_buddy, 1);
                  bs->name = g_strdup(purple_buddy_get_name(b));
                  g_hash_table_insert(sip->buddies, bs->name, bs);
            }
            xmlnode_free(isc);
      }
      return 0;
}

static void simple_subscribe_buddylist(struct simple_account_data *sip) {
      gchar *contact = "Event: vnd-microsoft-roaming-contacts\r\nAccept: application/vnd-microsoft-roaming-contacts+xml\r\nSupported: com.microsoft.autoextend\r\nSupported: ms-benotify\r\nProxy-Require: ms-benotify\r\nSupported: ms-piggyback-first-notify\r\n";
      gchar *to;
      gchar *tmp;
      to = g_strdup_printf("sip:%s@%s", sip->username, sip->servername);

      tmp = get_contact(sip);

      contact = g_strdup_printf("%sContact: %s\r\n", contact, tmp);
      g_free(tmp);

      send_sip_request(sip->gc, "SUBSCRIBE", to, to, contact, "", NULL, simple_add_lcs_contacts);

      g_free(to);
      g_free(contact);
}


static void simple_buddy_resub(char *name, struct simple_buddy *buddy, struct simple_account_data *sip) {
      time_t curtime = time(NULL);
      purple_debug_info("simple", "buddy resub\n");
      if(buddy->resubscribe < curtime) {
            purple_debug(PURPLE_DEBUG_MISC, "simple", "simple_buddy_resub %s\n", name);
            simple_subscribe(sip, buddy);
      }
}

static gboolean resend_timeout(struct simple_account_data *sip) {
      GSList *tmp = sip->transactions;
      time_t currtime = time(NULL);
      while(tmp) {
            struct transaction *trans = tmp->data;
            tmp = tmp->next;
            purple_debug_info("simple", "have open transaction age: %lu\n", currtime- trans->time);
            if((currtime - trans->time > 5) && trans->retries >= 1) {
                  /* TODO 408 */
            } else {
                  if((currtime - trans->time > 2) && trans->retries == 0) {
                        trans->retries++;
                        sendout_sipmsg(sip, trans->msg);
                  }
            }
      }
      return TRUE;
}

static gboolean subscribe_timeout(struct simple_account_data *sip) {
      GSList *tmp;
      time_t curtime = time(NULL);
      /* register again if first registration expires */
      if(sip->reregister < curtime) {
            do_register(sip);
      }

      /* publish status again if our last update is about to expire. */
      if (sip->republish != -1 && 
            sip->republish < curtime &&
            purple_account_get_bool(sip->account, "dopublish", TRUE))
      {
            purple_debug_info("simple", "subscribe_timeout: republishing status.\n");
            send_open_publish(sip);
      }

      /* check for every subscription if we need to resubscribe */
      g_hash_table_foreach(sip->buddies, (GHFunc)simple_buddy_resub, (gpointer)sip);

      /* remove a timed out suscriber */
      tmp = sip->watcher;
      while(tmp) {
            struct simple_watcher *watcher = tmp->data;
            if(watcher->expire < curtime) {
                  watcher_remove(sip, watcher->name);
                  tmp = sip->watcher;
            }
            if(tmp) tmp = tmp->next;
      }

      return TRUE;
}

static void simple_send_message(struct simple_account_data *sip, const char *to, const char *msg, const char *type) {
      gchar *hdr;
      gchar *fullto;
      if(strncmp(to, "sip:", 4))
            fullto = g_strdup_printf("sip:%s", to);
      else
            fullto = g_strdup(to);

      if(type) {
            hdr = g_strdup_printf("Content-Type: %s\r\n", type);
      } else {
            hdr = g_strdup("Content-Type: text/plain\r\n");
      }
      send_sip_request(sip->gc, "MESSAGE", fullto, fullto, hdr, msg, NULL, NULL);
      g_free(hdr);
      g_free(fullto);
}

static int simple_im_send(PurpleConnection *gc, const char *who, const char *what, PurpleMessageFlags flags) {
      struct simple_account_data *sip = gc->proto_data;
      char *to = g_strdup(who);
      char *text = purple_unescape_html(what);
      simple_send_message(sip, to, text, NULL);
      g_free(to);
      g_free(text);
      return 1;
}

static void process_incoming_message(struct simple_account_data *sip, struct sipmsg *msg) {
      gchar *from;
      const gchar *contenttype;
      gboolean found = FALSE;

      from = parse_from(sipmsg_find_header(msg, "From"));

      if(!from) return;

      purple_debug(PURPLE_DEBUG_MISC, "simple", "got message from %s: %s\n", from, msg->body);

      contenttype = sipmsg_find_header(msg, "Content-Type");
      if(!contenttype || !strncmp(contenttype, "text/plain", 10) || !strncmp(contenttype, "text/html", 9)) {
            serv_got_im(sip->gc, from, msg->body, 0, time(NULL));
            send_sip_response(sip->gc, msg, 200, "OK", NULL);
            found = TRUE;
      }
      else if(!strncmp(contenttype, "application/im-iscomposing+xml", 30)) {
            xmlnode *isc = xmlnode_from_str(msg->body, msg->bodylen);
            xmlnode *state;
            gchar *statedata;

            if(!isc) {
                  purple_debug_info("simple", "process_incoming_message: can not parse iscomposing\n");
                  g_free(from);
                  return;
            }

            state = xmlnode_get_child(isc, "state");

            if(!state) {
                  purple_debug_info("simple", "process_incoming_message: no state found\n");
                  xmlnode_free(isc);
                  g_free(from);
                  return;
            }

            statedata = xmlnode_get_data(state);
            if(statedata) {
                  if(strstr(statedata, "active"))
                        serv_got_typing(sip->gc, from, 0, PURPLE_TYPING);
                  else
                        serv_got_typing_stopped(sip->gc, from);

                  g_free(statedata);
            }
            xmlnode_free(isc);
            send_sip_response(sip->gc, msg, 200, "OK", NULL);
            found = TRUE;
      }
      if(!found) {
            purple_debug_info("simple", "got unknown mime-type\n");
            send_sip_response(sip->gc, msg, 415, "Unsupported media type", NULL);
      }
      g_free(from);
}


gboolean process_register_response(struct simple_account_data *sip, struct sipmsg *msg, struct transaction *tc) {
      const gchar *tmp;
      purple_debug(PURPLE_DEBUG_MISC, "simple", "in process register response response: %d\n", msg->response);
      switch (msg->response) {
            case 200:
                  if(sip->registerstatus < SIMPLE_REGISTER_COMPLETE) { /* registered */
                        if(purple_account_get_bool(sip->account, "dopublish", TRUE)) {
                              send_open_publish(sip);
                        }
                  }
                  sip->registerstatus = SIMPLE_REGISTER_COMPLETE;
                  purple_connection_set_state(sip->gc, PURPLE_CONNECTED);

                  /* get buddies from blist */
                  simple_get_buddies(sip->gc);

                  subscribe_timeout(sip);
                  tmp = sipmsg_find_header(msg, "Allow-Events");
                    if(tmp && strstr(tmp, "vnd-microsoft-provisioning")){
                        simple_subscribe_buddylist(sip);
                  }

                  break;
            case 401:
                  if(sip->registerstatus != SIMPLE_REGISTER_RETRY) {
                        purple_debug_info("simple", "REGISTER retries %d\n", sip->registrar.retries);
                        if(sip->registrar.retries > SIMPLE_REGISTER_RETRY_MAX) {
                              if (!purple_account_get_remember_password(sip->gc->account))
                                    purple_account_set_password(sip->gc->account, NULL);
                              purple_connection_error_reason(sip->gc,
                                    PURPLE_CONNECTION_ERROR_AUTHENTICATION_FAILED,
                                    _("Incorrect password"));
                              return TRUE;
                        }
                        tmp = sipmsg_find_header(msg, "WWW-Authenticate");
                        fill_auth(sip, tmp, &sip->registrar);
                        sip->registerstatus = SIMPLE_REGISTER_RETRY;
                        do_register(sip);
                  }
                  break;
            default:
                  if (sip->registerstatus != SIMPLE_REGISTER_RETRY) {
                        purple_debug_info("simple", "Unrecognized return code for REGISTER.\n");
                        if (sip->registrar.retries > SIMPLE_REGISTER_RETRY_MAX) {
                              purple_connection_error_reason(sip->gc,
                                    PURPLE_CONNECTION_ERROR_OTHER_ERROR,
                                    _("Unknown server response"));
                              return TRUE;
                        }
                        sip->registerstatus = SIMPLE_REGISTER_RETRY;
                        do_register(sip);
                  }
                  break;
            }
      return TRUE;
}

static gboolean dialog_match(struct sip_dialog *dialog, struct sipmsg *msg)
{
      const gchar *fromhdr;
      const gchar *tohdr;
      const gchar *callid;
      gchar *ourtag, *theirtag;
      gboolean match = FALSE;

      fromhdr = sipmsg_find_header(msg, "From");
      tohdr = sipmsg_find_header(msg, "To");
      callid = sipmsg_find_header(msg, "Call-ID");

      if (!fromhdr || !tohdr || !callid)
            return FALSE;

      ourtag = find_tag(tohdr);
      theirtag = find_tag(fromhdr);

      if (ourtag && theirtag &&
                  !strcmp(dialog->callid, callid) &&
                  !strcmp(dialog->ourtag, ourtag) &&
                  !strcmp(dialog->theirtag, theirtag))
            match = TRUE;

      g_free(ourtag);
      g_free(theirtag);

      return match;
}

static void process_incoming_notify(struct simple_account_data *sip, struct sipmsg *msg) {
      gchar *from;
      const gchar *fromhdr;
      gchar *basicstatus_data;
      xmlnode *pidf;
      xmlnode *basicstatus = NULL, *tuple, *status;
      gboolean isonline = FALSE;
      struct simple_buddy *b = NULL;
      const gchar *sshdr = NULL;

      fromhdr = sipmsg_find_header(msg, "From");
      from = parse_from(fromhdr);
      if(!from) return;

      b = g_hash_table_lookup(sip->buddies, from);
      if (!b)
      {
            g_free(from);
            purple_debug_info("simple", "Could not find the buddy.\n");
            return;
      }

      if (b->dialog && !dialog_match(b->dialog, msg))
      {
            /* We only accept notifies from people that
             * we already have a dialog with.
             */
            purple_debug_info("simple","No corresponding dialog for notify--discard\n");
            g_free(from);
            return;
      }

      pidf = xmlnode_from_str(msg->body, msg->bodylen);

      if(!pidf) {
            purple_debug_info("simple", "process_incoming_notify: no parseable pidf\n");
            sshdr = sipmsg_find_header(msg, "Subscription-State");
            if (sshdr)
            {
                  int i = 0;
                  gchar **ssparts = g_strsplit(sshdr, ":", 0);
                  while (ssparts[i])
                  {
                        g_strchug(ssparts[i]);
                        if (purple_str_has_prefix(ssparts[i], "terminated"))
                        {
                              purple_debug_info("simple", "Subscription expired!");
                              if (b->dialog)
                              {
                                    g_free(b->dialog->ourtag);
                                    g_free(b->dialog->theirtag);
                                    g_free(b->dialog->callid);
                                    g_free(b->dialog);
                                    b->dialog = NULL;
                              }

                              purple_prpl_got_user_status(sip->account, from, "offline", NULL);
                              break;
                        }
                        i++;
                  }
                  g_strfreev(ssparts);
            }
            send_sip_response(sip->gc, msg, 200, "OK", NULL);
            g_free(from);
            return;
      }

      if ((tuple = xmlnode_get_child(pidf, "tuple")))
            if ((status = xmlnode_get_child(tuple, "status")))
                  basicstatus = xmlnode_get_child(status, "basic");

      if(!basicstatus) {
            purple_debug_info("simple", "process_incoming_notify: no basic found\n");
            xmlnode_free(pidf);
            g_free(from);
            return;
      }

      basicstatus_data = xmlnode_get_data(basicstatus);

      if(!basicstatus_data) {
            purple_debug_info("simple", "process_incoming_notify: no basic data found\n");
            xmlnode_free(pidf);
            g_free(from);
            return;
      }

      if(strstr(basicstatus_data, "open"))
            isonline = TRUE;


      if(isonline) 
            purple_prpl_got_user_status(sip->account, from, "available", NULL);
      else 
            purple_prpl_got_user_status(sip->account, from, "offline", NULL);

      xmlnode_free(pidf);
      g_free(from);
      g_free(basicstatus_data);

      send_sip_response(sip->gc, msg, 200, "OK", NULL);
}

static unsigned int simple_typing(PurpleConnection *gc, const char *name, PurpleTypingState state) {
      struct simple_account_data *sip = gc->proto_data;

      gchar *xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
                  "<isComposing xmlns=\"urn:ietf:params:xml:ns:im-iscomposing\"\n"
                  "xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"\n"
                  "xsi:schemaLocation=\"urn:ietf:params:xml:ns:im-composing iscomposing.xsd\">\n"
                  "<state>%s</state>\n"
                  "<contenttype>text/plain</contenttype>\n"
                  "<refresh>60</refresh>\n"
                  "</isComposing>";
      gchar *recv = g_strdup(name);
      if(state == PURPLE_TYPING) {
            gchar *msg = g_strdup_printf(xml, "active");
            simple_send_message(sip, recv, msg, "application/im-iscomposing+xml");
            g_free(msg);
      } else /* TODO: Only if (state == PURPLE_TYPED) ? */ {
            gchar *msg = g_strdup_printf(xml, "idle");
            simple_send_message(sip, recv, msg, "application/im-iscomposing+xml");
            g_free(msg);
      }
      g_free(recv);
      /*
       * TODO: Is this right?  It will cause the core to call
       *       serv_send_typing(gc, who, PURPLE_TYPING) once every second
       *       until the user stops typing.  If that's not desired,
       *       then return 0 instead.
       */
      return 1;
}

static gchar *find_tag(const gchar *hdr) {
      const gchar *tmp = strstr(hdr, ";tag="), *tmp2;

      if(!tmp) return NULL;
      tmp += 5;
      if((tmp2 = strchr(tmp, ';'))) {
            return g_strndup(tmp, tmp2 - tmp);
      }
      return g_strdup(tmp);
}

static gchar* gen_xpidf(struct simple_account_data *sip) {
      gchar *doc = g_strdup_printf("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
                  "<presence>\n"
                  "<presentity uri=\"sip:%s@%s;method=SUBSCRIBE\"/>\n"
                  "<display name=\"sip:%s@%s\"/>\n"
                  "<atom id=\"1234\">\n"
                  "<address uri=\"sip:%s@%s\">\n"
                  "<status status=\"%s\"/>\n"
                  "</address>\n"
                  "</atom>\n"
                  "</presence>\n",
                  sip->username,
                  sip->servername,
                  sip->username,
                  sip->servername,
                  sip->username,
                  sip->servername,
                  sip->status);
      return doc;
}

static gchar* gen_pidf(struct simple_account_data *sip, gboolean open) {
      gchar *doc = g_strdup_printf("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
                  "<presence xmlns=\"urn:ietf:params:xml:ns:pidf\"\n"
                  "xmlns:im=\"urn:ietf:params:xml:ns:pidf:im\"\n"
                  "entity=\"sip:%s@%s\">\n"
                  "<tuple id=\"bs35r9f\">\n"
                  "<status>\n"
                  "<basic>%s</basic>\n"
                  "</status>\n"
                  "<note>%s</note>\n"
                  "</tuple>\n"
                  "</presence>",
                  sip->username,
                  sip->servername,
                  (open == TRUE) ? "open" : "closed",
                  (open == TRUE) ? sip->status : "");
      return doc;
}

static void send_notify(struct simple_account_data *sip, struct simple_watcher *watcher) {
      gchar *doc = watcher->needsxpidf ? gen_xpidf(sip) : gen_pidf(sip, TRUE);
      gchar *hdr = watcher->needsxpidf ? "Event: presence\r\nContent-Type: application/xpidf+xml\r\n" : "Event: presence\r\nContent-Type: application/pidf+xml\r\n";
      send_sip_request(sip->gc, "NOTIFY", watcher->name, watcher->name, hdr, doc, &watcher->dialog, NULL);
      g_free(doc);
}

static gboolean process_publish_response(struct simple_account_data *sip, struct sipmsg *msg, struct transaction *tc) {

      const gchar *etag = NULL;

      if(msg->response != 200 && msg->response != 408) {
            /* never send again */
            sip->republish = -1;
      }

      etag = sipmsg_find_header(msg, "SIP-Etag");
      if (etag) {
            /* we must store the etag somewhere. */
            g_free(sip->publish_etag);
            sip->publish_etag = g_strdup(etag);
      }

      return TRUE;
}

static void send_open_publish(struct simple_account_data *sip) {
      gchar *add_headers = NULL;
      gchar *uri = g_strdup_printf("sip:%s@%s", sip->username, sip->servername);
      gchar *doc = gen_pidf(sip, TRUE);

      add_headers = g_strdup_printf("%s%s%s%s%d\r\n%s",
            sip->publish_etag ? "SIP-If-Match: " : "",
            sip->publish_etag ? sip->publish_etag : "",
            sip->publish_etag ? "\r\n" : "",
            "Expires: ", PUBLISH_EXPIRATION,
            "Event: presence\r\n"
            "Content-Type: application/pidf+xml\r\n");

      send_sip_request(sip->gc, "PUBLISH", uri, uri,
            add_headers, doc, NULL, process_publish_response);
      sip->republish = time(NULL) + PUBLISH_EXPIRATION - 50;
      g_free(uri);
      g_free(doc);
      g_free(add_headers);
}

static void send_closed_publish(struct simple_account_data *sip) {
      gchar *uri = g_strdup_printf("sip:%s@%s", sip->username, sip->servername);
      gchar *add_headers, *doc;

      add_headers = g_strdup_printf("%s%s%s%s",
            sip->publish_etag ? "SIP-If-Match: " : "",
            sip->publish_etag ? sip->publish_etag : "",
            sip->publish_etag ? "\r\n" : "",
            "Expires: 600\r\n"
            "Event: presence\r\n"
            "Content-Type: application/pidf+xml\r\n");

      doc = gen_pidf(sip, FALSE);
      send_sip_request(sip->gc, "PUBLISH", uri, uri, add_headers,
            doc, NULL, process_publish_response);
      /*sip->republish = time(NULL) + 500;*/
      g_free(uri);
      g_free(doc);
      g_free(add_headers);
}

static void process_incoming_subscribe(struct simple_account_data *sip, struct sipmsg *msg) {
      const char *from_hdr = sipmsg_find_header(msg, "From");
      gchar *from = parse_from(from_hdr);
      gchar *theirtag = find_tag(from_hdr);
      gchar *ourtag = find_tag(sipmsg_find_header(msg, "To"));
      gboolean tagadded = FALSE;
      const gchar *callid = sipmsg_find_header(msg, "Call-ID");
      const gchar *expire = sipmsg_find_header(msg, "Expire");
      gchar *tmp;
      struct simple_watcher *watcher = watcher_find(sip, from);
      if(!ourtag) {
            tagadded = TRUE;
            ourtag = gentag();
      }
      if(!watcher) { /* new subscription */
            const gchar *acceptheader = sipmsg_find_header(msg, "Accept");
            gboolean needsxpidf = FALSE;
            if(!purple_privacy_check(sip->account, from)) {
                  send_sip_response(sip->gc, msg, 202, "Ok", NULL);
                  goto privend;
            }
            if(acceptheader) {
                  const gchar *tmp = acceptheader;
                  gboolean foundpidf = FALSE;
                  gboolean foundxpidf = FALSE;
                  while(tmp && tmp < acceptheader + strlen(acceptheader)) {
                        gchar *tmp2 = strchr(tmp, ',');
                        if(tmp2) *tmp2 = '\0';
                        if(!g_ascii_strcasecmp("application/pidf+xml", tmp))
                              foundpidf = TRUE;
                        if(!g_ascii_strcasecmp("application/xpidf+xml", tmp))
                              foundxpidf = TRUE;
                        if(tmp2) {
                              *tmp2 = ',';
                              tmp = tmp2 + 1;
                              while(*tmp == ' ') tmp++;
                        } else
                              tmp = 0;
                  }
                  if(!foundpidf && foundxpidf) needsxpidf = TRUE;
            }
            watcher = watcher_create(sip, from, callid, ourtag, theirtag, needsxpidf);
      }
      if(tagadded) {
            gchar *to = g_strdup_printf("%s;tag=%s", sipmsg_find_header(msg, "To"), ourtag);
            sipmsg_remove_header(msg, "To");
            sipmsg_add_header(msg, "To", to);
            g_free(to);
      }
      if(expire)
            watcher->expire = time(NULL) + strtol(expire, NULL, 10);
      else
            watcher->expire = time(NULL) + 600;
      sipmsg_remove_header(msg, "Contact");
      tmp = get_contact(sip);
      sipmsg_add_header(msg, "Contact", tmp);
      g_free(tmp);
      purple_debug_info("simple", "got subscribe: name %s ourtag %s theirtag %s callid %s\n", watcher->name, watcher->dialog.ourtag, watcher->dialog.theirtag, watcher->dialog.callid);
      send_sip_response(sip->gc, msg, 200, "Ok", NULL);
      send_notify(sip, watcher);
privend:
      g_free(from);
      g_free(theirtag);
      g_free(ourtag);
}

static void process_input_message(struct simple_account_data *sip, struct sipmsg *msg) {
      gboolean found = FALSE;
      if(msg->response == 0) { /* request */
            if(!strcmp(msg->method, "MESSAGE")) {
                  process_incoming_message(sip, msg);
                  found = TRUE;
            } else if(!strcmp(msg->method, "NOTIFY")) {
                  process_incoming_notify(sip, msg);
                  found = TRUE;
            } else if(!strcmp(msg->method, "SUBSCRIBE")) {
                  process_incoming_subscribe(sip, msg);
                  found = TRUE;
            } else {
                  send_sip_response(sip->gc, msg, 501, "Not implemented", NULL);
            }
      } else { /* response */
            struct transaction *trans = transactions_find(sip, msg);
            if(trans) {
                  if(msg->response == 407) {
                        gchar *resend, *auth;
                        const gchar *ptmp;

                        if(sip->proxy.retries > 3) return;
                        sip->proxy.retries++;
                        /* do proxy authentication */

                        ptmp = sipmsg_find_header(msg, "Proxy-Authenticate");

                        fill_auth(sip, ptmp, &sip->proxy);
                        auth = auth_header(sip, &sip->proxy, trans->msg->method, trans->msg->target);
                        sipmsg_remove_header(trans->msg, "Proxy-Authorization");
                        sipmsg_add_header(trans->msg, "Proxy-Authorization", auth);
                        g_free(auth);
                        resend = sipmsg_to_string(trans->msg);
                        /* resend request */
                        sendout_pkt(sip->gc, resend);
                        g_free(resend);
                  } else {
                        if(msg->response == 100) {
                              /* ignore provisional response */
                              purple_debug_info("simple", "got trying response\n");
                        } else {
                              sip->proxy.retries = 0;
                              if(!strcmp(trans->msg->method, "REGISTER")) {

                                    /* This is encountered when a REGISTER request was ...
                                     */
                                    if(msg->response == 401) {
                                          /* denied until further authentication was provided. */
                                          sip->registrar.retries++;
                                    }
                                    else if (msg->response != 200) {
                                          /* denied for some other reason! */
                                          sip->registrar.retries++;
                                    }
                                    else {
                                          /* accepted! */
                                          sip->registrar.retries = 0;
                                    }
                              } else {
                                    if(msg->response == 401) {
                                          /* This is encountered when a generic (MESSAGE, NOTIFY, etc)
                                           * was denied until further authorization is provided.
                                           */
                                          gchar *resend, *auth;
                                          const gchar *ptmp;

                                          if(sip->registrar.retries > SIMPLE_REGISTER_RETRY_MAX) return;
                                          sip->registrar.retries++;

                                          ptmp = sipmsg_find_header(msg, "WWW-Authenticate");

                                          fill_auth(sip, ptmp, &sip->registrar);
                                          auth = auth_header(sip, &sip->registrar, trans->msg->method, trans->msg->target);
                                          sipmsg_remove_header(trans->msg, "Authorization");
                                          sipmsg_add_header(trans->msg, "Authorization", auth);
                                          g_free(auth);
                                          resend = sipmsg_to_string(trans->msg);
                                          /* resend request */
                                          sendout_pkt(sip->gc, resend);
                                          g_free(resend);
                                    } else {
                                          /* Reset any count of retries that may have
                                           * accumulated in the above branch.
                                           */
                                          sip->registrar.retries = 0;
                                    }
                              }
                              if(trans->callback) {
                                    /* call the callback to process response*/
                                    (trans->callback)(sip, msg, trans);
                              }
                              transactions_remove(sip, trans);
                        }
                  }
                  found = TRUE;
            } else {
                  purple_debug(PURPLE_DEBUG_MISC, "simple", "received response to unknown transaction");
            }
      }
      if(!found) {
            purple_debug(PURPLE_DEBUG_MISC, "simple", "received a unknown sip message with method %s and response %d\n", msg->method, msg->response);
      }
}

static void process_input(struct simple_account_data *sip, struct sip_connection *conn)
{
      char *cur;
      char *dummy;
      struct sipmsg *msg;
      int restlen;
      cur = conn->inbuf;

      /* according to the RFC remove CRLF at the beginning */
      while(*cur == '\r' || *cur == '\n') {
            cur++;
      }
      if(cur != conn->inbuf) {
            memmove(conn->inbuf, cur, conn->inbufused - (cur - conn->inbuf));
            conn->inbufused = strlen(conn->inbuf);
      }

      /* Received a full Header? */
      if((cur = strstr(conn->inbuf, "\r\n\r\n")) != NULL) {
            time_t currtime = time(NULL);
            cur += 2;
            cur[0] = '\0';
            purple_debug_info("simple", "\n\nreceived - %s\n######\n%s\n#######\n\n", ctime(&currtime), conn->inbuf);
            msg = sipmsg_parse_header(conn->inbuf);

            if(!msg) {
                  /* Should we re-use this error message (from lower in the function)? */
                  purple_debug_misc("simple", "received a incomplete sip msg: %s\n", conn->inbuf);
                  return;
            }

            cur[0] = '\r';
            cur += 2;
            restlen = conn->inbufused - (cur - conn->inbuf);
            if(restlen >= msg->bodylen) {
                  dummy = g_malloc(msg->bodylen + 1);
                  memcpy(dummy, cur, msg->bodylen);
                  dummy[msg->bodylen] = '\0';
                  msg->body = dummy;
                  cur += msg->bodylen;
                  memmove(conn->inbuf, cur, conn->inbuflen - (cur - conn->inbuf));
                  conn->inbufused = strlen(conn->inbuf);
            } else {
                  sipmsg_free(msg);
                  return;
            }
            purple_debug(PURPLE_DEBUG_MISC, "simple", "in process response response: %d\n", msg->response);
            process_input_message(sip, msg);
      } else {
            purple_debug(PURPLE_DEBUG_MISC, "simple", "received a incomplete sip msg: %s\n", conn->inbuf);
      }
}

static void simple_udp_process(gpointer data, gint source, PurpleInputCondition con) {
      PurpleConnection *gc = data;
      struct simple_account_data *sip = gc->proto_data;
      struct sipmsg *msg;
      int len;
      time_t currtime;

      static char buffer[65536];
      if((len = recv(source, buffer, sizeof(buffer) - 1, 0)) > 0) {
            buffer[len] = '\0';
            purple_debug_info("simple", "\n\nreceived - %s\n######\n%s\n#######\n\n", ctime(&currtime), buffer);
            msg = sipmsg_parse_msg(buffer);
            if(msg) process_input_message(sip, msg);
      }
}

static void simple_input_cb(gpointer data, gint source, PurpleInputCondition cond)
{
      PurpleConnection *gc = data;
      struct simple_account_data *sip = gc->proto_data;
      int len;
      struct sip_connection *conn = connection_find(sip, source);
      if(!conn) {
            purple_debug_error("simple", "Connection not found!\n");
            return;
      }

      if(conn->inbuflen < conn->inbufused + SIMPLE_BUF_INC) {
            conn->inbuflen += SIMPLE_BUF_INC;
            conn->inbuf = g_realloc(conn->inbuf, conn->inbuflen);
      }

      len = read(source, conn->inbuf + conn->inbufused, SIMPLE_BUF_INC - 1);

      if(len < 0 && errno == EAGAIN)
            return;
      else if(len <= 0) {
            purple_debug_info("simple", "simple_input_cb: read error\n");
            connection_remove(sip, source);
            if(sip->fd == source) sip->fd = -1;
            return;
      }
      gc->last_received = time(NULL);
      conn->inbufused += len;
      conn->inbuf[conn->inbufused] = '\0';

      process_input(sip, conn);
}

/* Callback for new connections on incoming TCP port */
static void simple_newconn_cb(gpointer data, gint source, PurpleInputCondition cond) {
      PurpleConnection *gc = data;
      struct simple_account_data *sip = gc->proto_data;
      struct sip_connection *conn;
      int newfd, flags;

      newfd = accept(source, NULL, NULL);

      flags = fcntl(newfd, F_GETFL);
      fcntl(newfd, F_SETFL, flags | O_NONBLOCK);
#ifndef _WIN32
      fcntl(newfd, F_SETFD, FD_CLOEXEC);
#endif

      conn = connection_create(sip, newfd);

      conn->inputhandler = purple_input_add(newfd, PURPLE_INPUT_READ, simple_input_cb, gc);
}

static void login_cb(gpointer data, gint source, const gchar *error_message) {
      PurpleConnection *gc = data;
      struct simple_account_data *sip;
      struct sip_connection *conn;

      if(source < 0) {
            gchar *tmp = g_strdup_printf(_("Unable to connect: %s"),
                        error_message);
            purple_connection_error_reason(gc,
                  PURPLE_CONNECTION_ERROR_NETWORK_ERROR, tmp);
            g_free(tmp);
            return;
      }

      sip = gc->proto_data;
      sip->fd = source;

      conn = connection_create(sip, source);

      sip->registertimeout = purple_timeout_add((rand()%100)+10*1000, (GSourceFunc)subscribe_timeout, sip);

      do_register(sip);

      conn->inputhandler = purple_input_add(sip->fd, PURPLE_INPUT_READ, simple_input_cb, gc);
}

static guint simple_ht_hash_nick(const char *nick) {
      char *lc = g_utf8_strdown(nick, -1);
      guint bucket = g_str_hash(lc);
      g_free(lc);

      return bucket;
}

static gboolean simple_ht_equals_nick(const char *nick1, const char *nick2) {
      return (purple_utf8_strcasecmp(nick1, nick2) == 0);
}

static void simple_udp_host_resolved_listen_cb(int listenfd, gpointer data) {
      struct simple_account_data *sip = (struct simple_account_data*) data;

      sip->listen_data = NULL;

      if(listenfd == -1) {
            purple_connection_error_reason(sip->gc,
                  PURPLE_CONNECTION_ERROR_NETWORK_ERROR,
                  _("Unable to create listen socket"));
            return;
      }

      sip->fd = listenfd;

      sip->listenport = purple_network_get_port_from_fd(sip->fd);
      sip->listenfd = sip->fd;

      sip->listenpa = purple_input_add(sip->fd, PURPLE_INPUT_READ, simple_udp_process, sip->gc);

      sip->resendtimeout = purple_timeout_add(2500, (GSourceFunc) resend_timeout, sip);
      sip->registertimeout = purple_timeout_add((rand()%100)+10*1000, (GSourceFunc)subscribe_timeout, sip);
      do_register(sip);
}

static void simple_udp_host_resolved(GSList *hosts, gpointer data, const char *error_message) {
      struct simple_account_data *sip = (struct simple_account_data*) data;
      int addr_size;

      sip->query_data = NULL;

      if (!hosts || !hosts->data) {
            purple_connection_error_reason(sip->gc,
                  PURPLE_CONNECTION_ERROR_NETWORK_ERROR,
                  _("Unable to resolve hostname"));
            return;
      }

      addr_size = GPOINTER_TO_INT(hosts->data);
      hosts = g_slist_remove(hosts, hosts->data);
      memcpy(&(sip->serveraddr), hosts->data, addr_size);
      g_free(hosts->data);
      hosts = g_slist_remove(hosts, hosts->data);
      while(hosts) {
            hosts = g_slist_remove(hosts, hosts->data);
            g_free(hosts->data);
            hosts = g_slist_remove(hosts, hosts->data);
      }

      /* create socket for incoming connections */
      sip->listen_data = purple_network_listen_range(5060, 5160, SOCK_DGRAM,
                        simple_udp_host_resolved_listen_cb, sip);
      if (sip->listen_data == NULL) {
            purple_connection_error_reason(sip->gc,
                  PURPLE_CONNECTION_ERROR_NETWORK_ERROR,
                  _("Unable to create listen socket"));
            return;
      }
}

static void
simple_tcp_connect_listen_cb(int listenfd, gpointer data) {
      struct simple_account_data *sip = (struct simple_account_data*) data;

      sip->listen_data = NULL;

      sip->listenfd = listenfd;
      if(sip->listenfd == -1) {
            purple_connection_error_reason(sip->gc,
                  PURPLE_CONNECTION_ERROR_NETWORK_ERROR,
                  _("Unable to create listen socket"));
            return;
      }

      purple_debug_info("simple", "listenfd: %d\n", sip->listenfd);
      sip->listenport = purple_network_get_port_from_fd(sip->listenfd);
      sip->listenpa = purple_input_add(sip->listenfd, PURPLE_INPUT_READ,
                  simple_newconn_cb, sip->gc);
      purple_debug_info("simple", "connecting to %s port %d\n",
                  sip->realhostname, sip->realport);
      /* open tcp connection to the server */
      if (purple_proxy_connect(sip->gc, sip->account, sip->realhostname,
                  sip->realport, login_cb, sip->gc) == NULL) {
            purple_connection_error_reason(sip->gc,
                  PURPLE_CONNECTION_ERROR_NETWORK_ERROR,
                  _("Unable to connect"));
      }
}

static void srvresolved(PurpleSrvResponse *resp, int results, gpointer data) {
      struct simple_account_data *sip;
      gchar *hostname;
      int port;

      sip = data;
      sip->srv_query_data = NULL;

      port = purple_account_get_int(sip->account, "port", 0);

      /* find the host to connect to */
      if(results) {
            hostname = g_strdup(resp->hostname);
            if(!port)
                  port = resp->port;
            g_free(resp);
      } else {
            if(!purple_account_get_bool(sip->account, "useproxy", FALSE)) {
                  hostname = g_strdup(sip->servername);
            } else {
                  hostname = g_strdup(purple_account_get_string(sip->account, "proxy", sip->servername));
            }
      }

      sip->realhostname = hostname;
      sip->realport = port;
      if(!sip->realport) sip->realport = 5060;

      /* TCP case */
      if(!sip->udp) {
            /* create socket for incoming connections */
            sip->listen_data = purple_network_listen_range(5060, 5160, SOCK_STREAM,
                              simple_tcp_connect_listen_cb, sip);
            if (sip->listen_data == NULL) {
                  purple_connection_error_reason(sip->gc,
                        PURPLE_CONNECTION_ERROR_NETWORK_ERROR,
                        _("Unable to create listen socket"));
                  return;
            }
      } else { /* UDP */
            purple_debug_info("simple", "using udp with server %s and port %d\n", hostname, port);

            sip->query_data = purple_dnsquery_a(hostname, port, simple_udp_host_resolved, sip);
            if (sip->query_data == NULL) {
                  purple_connection_error_reason(sip->gc,
                        PURPLE_CONNECTION_ERROR_NETWORK_ERROR,
                        _("Unable to resolve hostname"));
            }
      }
}

static void simple_login(PurpleAccount *account)
{
      PurpleConnection *gc;
      struct simple_account_data *sip;
      gchar **userserver;
      const gchar *hosttoconnect;

      const char *username = purple_account_get_username(account);
      gc = purple_account_get_connection(account);

      if (strpbrk(username, " \t\v\r\n") != NULL) {
            purple_connection_error_reason(gc,
                  PURPLE_CONNECTION_ERROR_INVALID_SETTINGS,
                  _("SIP usernames may not contain whitespaces or @ symbols"));
            return;
      }

      gc->proto_data = sip = g_new0(struct simple_account_data, 1);
      sip->gc = gc;
      sip->account = account;
      sip->registerexpire = 900;
      sip->udp = purple_account_get_bool(account, "udp", FALSE);
      /* TODO: is there a good default grow size? */
      if(!sip->udp)
            sip->txbuf = purple_circ_buffer_new(0);

      userserver = g_strsplit(username, "@", 2);
      if (userserver[1] == NULL || userserver[1][0] == '\0') {
            purple_connection_error_reason(gc,
                  PURPLE_CONNECTION_ERROR_INVALID_SETTINGS,
                  _("SIP connect server not specified"));
            return;
      }

      purple_connection_set_display_name(gc, userserver[0]);
      sip->username = g_strdup(userserver[0]);
      sip->servername = g_strdup(userserver[1]);
      sip->password = g_strdup(purple_connection_get_password(gc));
      g_strfreev(userserver);

      sip->buddies = g_hash_table_new((GHashFunc)simple_ht_hash_nick, (GEqualFunc)simple_ht_equals_nick);

      purple_connection_update_progress(gc, _("Connecting"), 1, 2);

      /* TODO: Set the status correctly. */
      sip->status = g_strdup("available");

      if(!purple_account_get_bool(account, "useproxy", FALSE)) {
            hosttoconnect = sip->servername;
      } else {
            hosttoconnect = purple_account_get_string(account, "proxy", sip->servername);
      }

      sip->srv_query_data = purple_srv_resolve("sip",
                  sip->udp ? "udp" : "tcp", hosttoconnect, srvresolved, sip);
}

static void simple_close(PurpleConnection *gc)
{
      struct simple_account_data *sip = gc->proto_data;

      if(sip) {
            /* unregister */
            if (sip->registerstatus == SIMPLE_REGISTER_COMPLETE)
            {
                  g_hash_table_foreach(sip->buddies,
                        (GHFunc)simple_unsubscribe,
                        (gpointer)sip);

                  if(purple_account_get_bool(sip->account,
                                       "dopublish", TRUE))
                        send_closed_publish(sip);

                  do_register_exp(sip, 0);
            }
            connection_free_all(sip);

            if (sip->query_data != NULL)
                  purple_dnsquery_destroy(sip->query_data);

            if (sip->srv_query_data != NULL)
                  purple_srv_cancel(sip->srv_query_data);

            if (sip->listen_data != NULL)
                  purple_network_listen_cancel(sip->listen_data);

            g_free(sip->servername);
            g_free(sip->username);
            g_free(sip->password);
            g_free(sip->registrar.nonce);
            g_free(sip->registrar.opaque);
            g_free(sip->registrar.target);
            g_free(sip->registrar.realm);
            g_free(sip->registrar.digest_session_key);
            g_free(sip->proxy.nonce);
            g_free(sip->proxy.opaque);
            g_free(sip->proxy.target);
            g_free(sip->proxy.realm);
            g_free(sip->proxy.digest_session_key);
            g_free(sip->publish_etag);
            if(sip->txbuf)
                  purple_circ_buffer_destroy(sip->txbuf);
            g_free(sip->realhostname);
            if(sip->listenpa) purple_input_remove(sip->listenpa);
            if(sip->tx_handler) purple_input_remove(sip->tx_handler);
            if(sip->resendtimeout) purple_timeout_remove(sip->resendtimeout);
            if(sip->registertimeout) purple_timeout_remove(sip->registertimeout);
      }
      g_free(gc->proto_data);
      gc->proto_data = NULL;
}

static PurplePluginProtocolInfo prpl_info =
{
      0,
      NULL,                         /* user_splits */
      NULL,                         /* protocol_options */
      NO_BUDDY_ICONS,               /* icon_spec */
      simple_list_icon,       /* list_icon */
      NULL,                         /* list_emblems */
      NULL,                         /* status_text */
      NULL,                         /* tooltip_text */
      simple_status_types,    /* away_states */
      NULL,                         /* blist_node_menu */
      NULL,                         /* chat_info */
      NULL,                         /* chat_info_defaults */
      simple_login,                 /* login */
      simple_close,                 /* close */
      simple_im_send,               /* send_im */
      NULL,                         /* set_info */
      simple_typing,                /* send_typing */
      NULL,                         /* get_info */
      simple_set_status,            /* set_status */
      NULL,                         /* set_idle */
      NULL,                         /* change_passwd */
      simple_add_buddy,       /* add_buddy */
      NULL,                         /* add_buddies */
      simple_remove_buddy,    /* remove_buddy */
      NULL,                         /* remove_buddies */
      NULL,                         /* add_permit */
      NULL,                         /* add_deny */
      NULL,                         /* rem_permit */
      NULL,                         /* rem_deny */
      NULL,                         /* set_permit_deny */
      NULL,                         /* join_chat */
      NULL,                         /* reject_chat */
      NULL,                         /* get_chat_name */
      NULL,                         /* chat_invite */
      NULL,                         /* chat_leave */
      NULL,                         /* chat_whisper */
      NULL,                         /* chat_send */
      simple_keep_alive,            /* keepalive */
      NULL,                         /* register_user */
      NULL,                         /* get_cb_info */
      NULL,                         /* get_cb_away */
      NULL,                         /* alias_buddy */
      NULL,                         /* group_buddy */
      NULL,                         /* rename_group */
      NULL,                         /* buddy_free */
      NULL,                         /* convo_closed */
      NULL,                         /* normalize */
      NULL,                         /* set_buddy_icon */
      NULL,                         /* remove_group */
      NULL,                         /* get_cb_real_name */
      NULL,                         /* set_chat_topic */
      NULL,                         /* find_blist_chat */
      NULL,                         /* roomlist_get_list */
      NULL,                         /* roomlist_cancel */
      NULL,                         /* roomlist_expand_category */
      NULL,                         /* can_receive_file */
      NULL,                         /* send_file */
      NULL,                         /* new_xfer */
      NULL,                         /* offline_message */
      NULL,                         /* whiteboard_prpl_ops */
      simple_send_raw,        /* send_raw */
      NULL,                         /* roomlist_room_serialize */
      NULL,                         /* unregister_user */
      NULL,                         /* send_attention */
      NULL,                         /* get_attention_types */
      sizeof(PurplePluginProtocolInfo),       /* struct_size */
      NULL,                         /* get_account_text_table */
      NULL,                         /* initiate_media */
      NULL                          /* can_do_media */
};


static PurplePluginInfo info =
{
      PURPLE_PLUGIN_MAGIC,
      PURPLE_MAJOR_VERSION,
      PURPLE_MINOR_VERSION,
      PURPLE_PLUGIN_PROTOCOL,                             /**< type           */
      NULL,                                             /**< ui_requirement */
      0,                                                /**< flags          */
      NULL,                                             /**< dependencies   */
      PURPLE_PRIORITY_DEFAULT,                            /**< priority       */

      "prpl-simple",                                    /**< id             */
      "SIMPLE",                                         /**< name           */
      DISPLAY_VERSION,                                  /**< version        */
      N_("SIP/SIMPLE Protocol Plugin"),                 /**  summary        */
      N_("The SIP/SIMPLE Protocol Plugin"),             /**  description    */
      "Thomas Butter <butter@uni-mannheim.de>",         /**< author         */
      PURPLE_WEBSITE,                                     /**< homepage       */

      NULL,                                             /**< load           */
      NULL,                                             /**< unload         */
      NULL,                                             /**< destroy        */

      NULL,                                             /**< ui_info        */
      &prpl_info,                                       /**< extra_info     */
      NULL,
      NULL,

      /* padding */
      NULL,
      NULL,
      NULL,
      NULL
};

static void _init_plugin(PurplePlugin *plugin)
{
      PurpleAccountUserSplit *split;
      PurpleAccountOption *option;

      split = purple_account_user_split_new(_("Server"), "", '@');
      prpl_info.user_splits = g_list_append(prpl_info.user_splits, split);

      option = purple_account_option_bool_new(_("Publish status (note: everyone may watch you)"), "dopublish", TRUE);
      prpl_info.protocol_options = g_list_append(prpl_info.protocol_options, option);

      option = purple_account_option_int_new(_("Connect port"), "port", 0);
      prpl_info.protocol_options = g_list_append(prpl_info.protocol_options, option);

      option = purple_account_option_bool_new(_("Use UDP"), "udp", FALSE);
      prpl_info.protocol_options = g_list_append(prpl_info.protocol_options, option);
      option = purple_account_option_bool_new(_("Use proxy"), "useproxy", FALSE);
      prpl_info.protocol_options = g_list_append(prpl_info.protocol_options, option);
      option = purple_account_option_string_new(_("Proxy"), "proxy", "");
      prpl_info.protocol_options = g_list_append(prpl_info.protocol_options, option);
      option = purple_account_option_string_new(_("Auth User"), "authuser", "");
      prpl_info.protocol_options = g_list_append(prpl_info.protocol_options, option);
      option = purple_account_option_string_new(_("Auth Domain"), "authdomain", "");
      prpl_info.protocol_options = g_list_append(prpl_info.protocol_options, option);
}

PURPLE_INIT_PLUGIN(simple, _init_plugin, info);

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