--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/protocols/sametime/meanwhile/channel.c Fri Jan 20 00:19:53 2006 +0000
@@ -0,0 +1,961 @@
+
+/*
+ Meanwhile - Unofficial Lotus Sametime Community Client Library
+ Copyright (C) 2004 Christopher (siege) O'Brien
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public
+ License as published by the Free Software Foundation; either
+ version 2 of the License, or (at your option) any later version.
+
+ This library 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with this library; if not, write to the Free
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#include <glib.h>
+#include <glib/ghash.h>
+#include <glib/glist.h>
+#include <string.h>
+
+#include "mw_channel.h"
+#include "mw_cipher.h"
+#include "mw_debug.h"
+#include "mw_error.h"
+#include "mw_message.h"
+#include "mw_service.h"
+#include "mw_session.h"
+#include "mw_util.h"
+
+
+/** @todo reorganize this file, stuff is just strewn about */
+
+
+struct mwChannel {
+
+ /** session this channel belongs to */
+ struct mwSession *session;
+
+ enum mwChannelState state;
+
+ /** creator for incoming channel, target for outgoing channel */
+ struct mwLoginInfo user;
+
+ /* similar to data from the CreateCnl message in 8.4.1.7 */
+ guint32 reserved; /**< special, unknown meaning */
+ guint32 id; /**< channel ID */
+ guint32 service; /**< service ID */
+ guint32 proto_type; /**< service protocol type */
+ guint32 proto_ver; /**< service protocol version */
+ guint32 options; /**< channel options */
+
+ struct mwOpaque addtl_create;
+ struct mwOpaque addtl_accept;
+
+ /** all those supported ciphers */
+ GHashTable *supported;
+ guint16 offered_policy; /**< @see enum mwEncryptPolicy */
+ guint16 policy; /**< @see enum mwEncryptPolicy */
+
+ /** cipher information determined at channel acceptance */
+ struct mwCipherInstance *cipher;
+
+ /** statistics table */
+ GHashTable *stats;
+
+ GSList *outgoing_queue; /**< queued outgoing messages */
+ GSList *incoming_queue; /**< queued incoming messages */
+
+ struct mw_datum srvc_data; /**< service-specific data */
+};
+
+
+struct mwChannelSet {
+ struct mwSession *session; /**< owning session */
+ GHashTable *map; /**< map of all channels, by ID */
+ guint32 counter; /**< counter for outgoing ID */
+};
+
+
+static void flush_channel(struct mwChannel *);
+
+
+static const char *state_str(enum mwChannelState state) {
+ switch(state) {
+ case mwChannel_NEW: return "new";
+ case mwChannel_INIT: return "initializing";
+ case mwChannel_WAIT: return "waiting";
+ case mwChannel_OPEN: return "open";
+ case mwChannel_DESTROY: return "closing";
+ case mwChannel_ERROR: return "error";
+
+ case mwChannel_UNKNOWN: /* fall through */
+ default: return "UNKNOWN";
+ }
+}
+
+
+static void state(struct mwChannel *chan, enum mwChannelState state,
+ guint32 err_code) {
+
+ g_return_if_fail(chan != NULL);
+
+ if(chan->state == state) return;
+
+ chan->state = state;
+
+ if(err_code) {
+ g_message("channel 0x%08x state: %s (0x%08x)",
+ chan->id, state_str(state), err_code);
+ } else {
+ g_message("channel 0x%08x state: %s", chan->id, state_str(state));
+ }
+}
+
+
+static gpointer get_stat(struct mwChannel *chan,
+ enum mwChannelStatField field) {
+
+ return g_hash_table_lookup(chan->stats, (gpointer) field);
+}
+
+
+static void set_stat(struct mwChannel *chan, enum mwChannelStatField field,
+ gpointer val) {
+
+ g_hash_table_insert(chan->stats, (gpointer) field, val);
+}
+
+
+#define incr_stat(chan, field, incr) \
+ set_stat(chan, field, get_stat(chan, field) + incr)
+
+
+#define timestamp_stat(chan, field) \
+ set_stat(chan, field, (gpointer) time(NULL))
+
+
+static void sup_free(gpointer a) {
+ mwCipherInstance_free(a);
+}
+
+
+struct mwCipherInstance *get_supported(struct mwChannel *chan, guint16 id) {
+ guint32 cid = (guint32) id;
+ return g_hash_table_lookup(chan->supported, GUINT_TO_POINTER(cid));
+}
+
+
+void put_supported(struct mwChannel *chan, struct mwCipherInstance *ci) {
+ struct mwCipher *cipher = mwCipherInstance_getCipher(ci);
+ guint32 cid = (guint32) mwCipher_getType(cipher);
+ g_hash_table_insert(chan->supported, GUINT_TO_POINTER(cid), ci);
+}
+
+
+struct mwChannel *mwChannel_newIncoming(struct mwChannelSet *cs, guint32 id) {
+ struct mwChannel *chan;
+
+ g_return_val_if_fail(cs != NULL, NULL);
+ g_return_val_if_fail(cs->session != NULL, NULL);
+
+ chan = g_new0(struct mwChannel, 1);
+ chan->state = mwChannel_NEW;
+ chan->session = cs->session;
+ chan->id = id;
+
+ chan->stats = g_hash_table_new(g_direct_hash, g_direct_equal);
+
+ chan->supported = g_hash_table_new_full(g_direct_hash, g_direct_equal,
+ NULL, sup_free);
+
+ g_hash_table_insert(cs->map, GUINT_TO_POINTER(id), chan);
+
+ state(chan, mwChannel_WAIT, 0);
+
+ return chan;
+}
+
+
+struct mwChannel *mwChannel_newOutgoing(struct mwChannelSet *cs) {
+ guint32 id;
+ struct mwChannel *chan;
+
+ g_return_val_if_fail(cs != NULL, NULL);
+ g_return_val_if_fail(cs->map != NULL, NULL);
+
+ /* grab the next id, and try to make sure there isn't already a
+ channel using it */
+ do {
+ id = ++cs->counter;
+ } while(g_hash_table_lookup(cs->map, GUINT_TO_POINTER(id)));
+
+ chan = mwChannel_newIncoming(cs, id);
+ state(chan, mwChannel_INIT, 0);
+
+ return chan;
+}
+
+
+guint32 mwChannel_getId(struct mwChannel *chan) {
+ g_return_val_if_fail(chan != NULL, 0);
+ return chan->id;
+}
+
+
+struct mwSession *mwChannel_getSession(struct mwChannel *chan) {
+ g_return_val_if_fail(chan != NULL, NULL);
+ return chan->session;
+}
+
+
+guint32 mwChannel_getServiceId(struct mwChannel *chan) {
+ g_return_val_if_fail(chan != NULL, 0);
+ return chan->service;
+}
+
+
+struct mwService *mwChannel_getService(struct mwChannel *chan) {
+ g_return_val_if_fail(chan != NULL, NULL);
+ return mwSession_getService(chan->session, chan->service);
+}
+
+
+void mwChannel_setService(struct mwChannel *chan, struct mwService *srvc) {
+ g_return_if_fail(chan != NULL);
+ g_return_if_fail(srvc != NULL);
+ g_return_if_fail(chan->state == mwChannel_INIT);
+ chan->service = mwService_getType(srvc);
+}
+
+
+gpointer mwChannel_getServiceData(struct mwChannel *chan) {
+ g_return_val_if_fail(chan != NULL, NULL);
+ return mw_datum_get(&chan->srvc_data);
+}
+
+
+void mwChannel_setServiceData(struct mwChannel *chan,
+ gpointer data, GDestroyNotify clean) {
+
+ g_return_if_fail(chan != NULL);
+ mw_datum_set(&chan->srvc_data, data, clean);
+}
+
+
+void mwChannel_removeServiceData(struct mwChannel *chan) {
+ g_return_if_fail(chan != NULL);
+ mw_datum_clear(&chan->srvc_data);
+}
+
+
+guint32 mwChannel_getProtoType(struct mwChannel *chan) {
+ g_return_val_if_fail(chan != NULL, 0x00);
+ return chan->proto_type;
+}
+
+
+void mwChannel_setProtoType(struct mwChannel *chan, guint32 proto_type) {
+ g_return_if_fail(chan != NULL);
+ g_return_if_fail(chan->state == mwChannel_INIT);
+ chan->proto_type = proto_type;
+}
+
+
+guint32 mwChannel_getProtoVer(struct mwChannel *chan) {
+ g_return_val_if_fail(chan != NULL, 0x00);
+ return chan->proto_ver;
+}
+
+
+void mwChannel_setProtoVer(struct mwChannel *chan, guint32 proto_ver) {
+ g_return_if_fail(chan != NULL);
+ g_return_if_fail(chan->state == mwChannel_INIT);
+ chan->proto_ver = proto_ver;
+}
+
+
+guint16 mwChannel_getEncryptPolicy(struct mwChannel *chan) {
+ g_return_val_if_fail(chan != NULL, 0x00);
+ return chan->policy;
+}
+
+
+guint32 mwChannel_getOptions(struct mwChannel *chan) {
+ g_return_val_if_fail(chan != NULL, 0x00);
+ return chan->options;
+}
+
+
+void mwChannel_setOptions(struct mwChannel *chan, guint32 options) {
+ g_return_if_fail(chan != NULL);
+ g_return_if_fail(chan->state == mwChannel_INIT);
+ chan->options = options;
+}
+
+
+struct mwLoginInfo *mwChannel_getUser(struct mwChannel *chan) {
+ g_return_val_if_fail(chan != NULL, NULL);
+ return &chan->user;
+}
+
+
+struct mwOpaque *mwChannel_getAddtlCreate(struct mwChannel *chan) {
+ g_return_val_if_fail(chan != NULL, NULL);
+ return &chan->addtl_create;
+}
+
+
+struct mwOpaque *mwChannel_getAddtlAccept(struct mwChannel *chan) {
+ g_return_val_if_fail(chan != NULL, NULL);
+ return &chan->addtl_accept;
+}
+
+
+struct mwCipherInstance *mwChannel_getCipherInstance(struct mwChannel *chan) {
+ g_return_val_if_fail(chan != NULL, NULL);
+ return chan->cipher;
+}
+
+
+enum mwChannelState mwChannel_getState(struct mwChannel *chan) {
+ g_return_val_if_fail(chan != NULL, mwChannel_UNKNOWN);
+ return chan->state;
+}
+
+
+gpointer mwChannel_getStatistic(struct mwChannel *chan,
+ enum mwChannelStatField stat) {
+
+ g_return_val_if_fail(chan != NULL, 0);
+ g_return_val_if_fail(chan->stats != NULL, 0);
+
+ return get_stat(chan, stat);
+}
+
+
+/* send a channel create message */
+int mwChannel_create(struct mwChannel *chan) {
+ struct mwMsgChannelCreate *msg;
+ GList *list, *l;
+ int ret;
+
+ g_return_val_if_fail(chan != NULL, -1);
+ g_return_val_if_fail(chan->state == mwChannel_INIT, -1);
+ g_return_val_if_fail(mwChannel_isOutgoing(chan), -1);
+
+ msg = (struct mwMsgChannelCreate *)
+ mwMessage_new(mwMessage_CHANNEL_CREATE);
+
+ msg->channel = chan->id;
+ msg->target.user = g_strdup(chan->user.user_id);
+ msg->target.community = g_strdup(chan->user.community);
+ msg->service = chan->service;
+ msg->proto_type = chan->proto_type;
+ msg->proto_ver = chan->proto_ver;
+ msg->options = chan->options;
+ mwOpaque_clone(&msg->addtl, &chan->addtl_create);
+
+ list = mwChannel_getSupportedCipherInstances(chan);
+ if(list) {
+ /* offer what we have */
+ for(l = list; l; l = l->next) {
+ struct mwEncryptItem *ei = mwCipherInstance_offer(l->data);
+ msg->encrypt.items = g_list_append(msg->encrypt.items, ei);
+ }
+
+ /* we're easy to get along with */
+ chan->offered_policy = mwEncrypt_WHATEVER;
+ g_list_free(list);
+
+ } else {
+ /* we apparently don't support anything */
+ chan->offered_policy = mwEncrypt_NONE;
+ }
+
+ msg->encrypt.mode = chan->offered_policy;
+ msg->encrypt.extra = chan->offered_policy;
+
+ ret = mwSession_send(chan->session, MW_MESSAGE(msg));
+ mwMessage_free(MW_MESSAGE(msg));
+
+ state(chan, (ret)? mwChannel_ERROR: mwChannel_WAIT, ret);
+
+ return ret;
+}
+
+
+static void channel_open(struct mwChannel *chan) {
+ state(chan, mwChannel_OPEN, 0);
+ timestamp_stat(chan, mwChannelStat_OPENED_AT);
+ flush_channel(chan);
+}
+
+
+int mwChannel_accept(struct mwChannel *chan) {
+ struct mwSession *session;
+ struct mwMsgChannelAccept *msg;
+ struct mwCipherInstance *ci;
+
+ int ret;
+
+ g_return_val_if_fail(chan != NULL, -1);
+ g_return_val_if_fail(mwChannel_isIncoming(chan), -1);
+ g_return_val_if_fail(chan->state == mwChannel_WAIT, -1);
+
+ session = chan->session;
+ g_return_val_if_fail(session != NULL, -1);
+
+ msg = (struct mwMsgChannelAccept *)
+ mwMessage_new(mwMessage_CHANNEL_ACCEPT);
+
+ msg->head.channel = chan->id;
+ msg->service = chan->service;
+ msg->proto_type = chan->proto_type;
+ msg->proto_ver = chan->proto_ver;
+ mwOpaque_clone(&msg->addtl, &chan->addtl_accept);
+
+ ci = chan->cipher;
+
+ if(! ci) {
+ /* automatically select a cipher if one hasn't been already */
+
+ switch(chan->offered_policy) {
+ case mwEncrypt_NONE:
+ mwChannel_selectCipherInstance(chan, NULL);
+ break;
+
+ case mwEncrypt_RC2_40:
+ ci = get_supported(chan, mwCipher_RC2_40);
+ mwChannel_selectCipherInstance(chan, ci);
+ break;
+
+ case mwEncrypt_RC2_128:
+ ci = get_supported(chan, mwCipher_RC2_128);
+ mwChannel_selectCipherInstance(chan, ci);
+ break;
+
+ case mwEncrypt_WHATEVER:
+ case mwEncrypt_ALL:
+ default:
+ {
+ GList *l, *ll;
+
+ l = mwChannel_getSupportedCipherInstances(chan);
+ if(l) {
+ /* nobody selected a cipher, so we'll just pick the last in
+ the list of available ones */
+ for(ll = l; ll->next; ll = ll->next);
+ ci = ll->data;
+ g_list_free(l);
+
+ mwChannel_selectCipherInstance(chan, ci);
+
+ } else {
+ /* this may cause breakage, but there's really nothing else
+ we can do. They want something we can't provide. If they
+ don't like it, then they'll error the channel out */
+ mwChannel_selectCipherInstance(chan, NULL);
+ }
+ }
+ }
+ }
+
+ msg->encrypt.mode = chan->policy; /* set in selectCipherInstance */
+ msg->encrypt.extra = chan->offered_policy;
+
+ if(chan->cipher) {
+ msg->encrypt.item = mwCipherInstance_accept(chan->cipher);
+ }
+
+ ret = mwSession_send(session, MW_MESSAGE(msg));
+ mwMessage_free(MW_MESSAGE(msg));
+
+ if(ret) {
+ state(chan, mwChannel_ERROR, ret);
+ } else {
+ channel_open(chan);
+ }
+
+ return ret;
+}
+
+
+static void channel_free(struct mwChannel *chan) {
+ struct mwSession *s;
+ struct mwMessage *msg;
+ GSList *l;
+
+ /* maybe no warning in the future */
+ g_return_if_fail(chan != NULL);
+
+ s = chan->session;
+
+ mwLoginInfo_clear(&chan->user);
+ mwOpaque_clear(&chan->addtl_create);
+ mwOpaque_clear(&chan->addtl_accept);
+
+ if(chan->supported) {
+ g_hash_table_destroy(chan->supported);
+ chan->supported = NULL;
+ }
+
+ if(chan->stats) {
+ g_hash_table_destroy(chan->stats);
+ chan->stats = NULL;
+ }
+
+ mwCipherInstance_free(chan->cipher);
+
+ /* clean up the outgoing queue */
+ for(l = chan->outgoing_queue; l; l = l->next) {
+ msg = (struct mwMessage *) l->data;
+ l->data = NULL;
+ mwMessage_free(msg);
+ }
+ g_slist_free(chan->outgoing_queue);
+
+ /* clean up the incoming queue */
+ for(l = chan->incoming_queue; l; l = l->next) {
+ msg = (struct mwMessage *) l->data;
+ l->data = NULL;
+ mwMessage_free(msg);
+ }
+ g_slist_free(chan->incoming_queue);
+
+ g_free(chan);
+}
+
+
+int mwChannel_destroy(struct mwChannel *chan,
+ guint32 reason, struct mwOpaque *info) {
+
+ struct mwMsgChannelDestroy *msg;
+ struct mwSession *session;
+ struct mwChannelSet *cs;
+ int ret;
+
+ /* may make this not a warning in the future */
+ g_return_val_if_fail(chan != NULL, 0);
+
+ state(chan, reason? mwChannel_ERROR: mwChannel_DESTROY, reason);
+
+ session = chan->session;
+ g_return_val_if_fail(session != NULL, -1);
+
+ cs = mwSession_getChannels(session);
+ g_return_val_if_fail(cs != NULL, -1);
+
+ /* compose the message */
+ msg = (struct mwMsgChannelDestroy *)
+ mwMessage_new(mwMessage_CHANNEL_DESTROY);
+ msg->head.channel = chan->id;
+ msg->reason = reason;
+ if(info) mwOpaque_clone(&msg->data, info);
+
+ /* remove the channel from the channel set */
+ g_hash_table_remove(cs->map, GUINT_TO_POINTER(chan->id));
+
+ /* send the message */
+ ret = mwSession_send(session, (struct mwMessage *) msg);
+ mwMessage_free(MW_MESSAGE(msg));
+
+ return ret;
+}
+
+
+static void queue_outgoing(struct mwChannel *chan,
+ struct mwMsgChannelSend *msg) {
+
+ g_info("queue_outgoing, channel 0x%08x", chan->id);
+ chan->outgoing_queue = g_slist_append(chan->outgoing_queue, msg);
+}
+
+
+static int channel_send(struct mwChannel *chan,
+ struct mwMsgChannelSend *msg) {
+
+ int ret = 0;
+
+ /* if the channel is open, send and free the message. Otherwise,
+ queue the message to be sent once the channel is finally
+ opened */
+
+ if(chan->state == mwChannel_OPEN) {
+ ret = mwSession_send(chan->session, (struct mwMessage *) msg);
+ mwMessage_free(MW_MESSAGE(msg));
+
+ } else {
+ queue_outgoing(chan, msg);
+ }
+
+ return ret;
+}
+
+
+int mwChannel_sendEncrypted(struct mwChannel *chan,
+ guint32 type, struct mwOpaque *data,
+ gboolean encrypt) {
+
+ struct mwMsgChannelSend *msg;
+
+ g_return_val_if_fail(chan != NULL, -1);
+
+ msg = (struct mwMsgChannelSend *) mwMessage_new(mwMessage_CHANNEL_SEND);
+ msg->head.channel = chan->id;
+ msg->type = type;
+
+ mwOpaque_clone(&msg->data, data);
+
+ if(encrypt && chan->cipher) {
+ msg->head.options = mwMessageOption_ENCRYPT;
+ mwCipherInstance_encrypt(chan->cipher, &msg->data);
+ }
+
+ return channel_send(chan, msg);
+}
+
+
+int mwChannel_send(struct mwChannel *chan, guint32 type,
+ struct mwOpaque *data) {
+
+ return mwChannel_sendEncrypted(chan, type, data, TRUE);
+}
+
+
+static void queue_incoming(struct mwChannel *chan,
+ struct mwMsgChannelSend *msg) {
+
+ /* we clone the message, because session_process will clear it once
+ we return */
+
+ struct mwMsgChannelSend *m = g_new0(struct mwMsgChannelSend, 1);
+ m->head.type = msg->head.type;
+ m->head.options = msg->head.options;
+ m->head.channel = msg->head.channel;
+ mwOpaque_clone(&m->head.attribs, &msg->head.attribs);
+
+ m->type = msg->type;
+ mwOpaque_clone(&m->data, &msg->data);
+
+ g_info("queue_incoming, channel 0x%08x", chan->id);
+ chan->incoming_queue = g_slist_append(chan->incoming_queue, m);
+}
+
+
+static void channel_recv(struct mwChannel *chan,
+ struct mwMsgChannelSend *msg) {
+
+ struct mwService *srvc;
+ srvc = mwChannel_getService(chan);
+
+ incr_stat(chan, mwChannelStat_MSG_RECV, 1);
+
+ if(msg->head.options & mwMessageOption_ENCRYPT) {
+ struct mwOpaque data = { 0, 0 };
+ mwOpaque_clone(&data, &msg->data);
+
+ mwCipherInstance_decrypt(chan->cipher, &data);
+ mwService_recv(srvc, chan, msg->type, &data);
+ mwOpaque_clear(&data);
+
+ } else {
+ mwService_recv(srvc, chan, msg->type, &msg->data);
+ }
+}
+
+
+static void flush_channel(struct mwChannel *chan) {
+ GSList *l;
+
+ for(l = chan->incoming_queue; l; l = l->next) {
+ struct mwMsgChannelSend *msg = (struct mwMsgChannelSend *) l->data;
+ l->data = NULL;
+
+ channel_recv(chan, msg);
+ mwMessage_free(MW_MESSAGE(msg));
+ }
+ g_slist_free(chan->incoming_queue);
+ chan->incoming_queue = NULL;
+
+ for(l = chan->outgoing_queue; l; l = l->next) {
+ struct mwMessage *msg = (struct mwMessage *) l->data;
+ l->data = NULL;
+
+ mwSession_send(chan->session, msg);
+ mwMessage_free(msg);
+ }
+ g_slist_free(chan->outgoing_queue);
+ chan->outgoing_queue = NULL;
+}
+
+
+void mwChannel_recv(struct mwChannel *chan, struct mwMsgChannelSend *msg) {
+ if(chan->state == mwChannel_OPEN) {
+ channel_recv(chan, msg);
+
+ } else {
+ queue_incoming(chan, msg);
+ }
+}
+
+
+struct mwChannel *mwChannel_find(struct mwChannelSet *cs, guint32 chan) {
+ g_return_val_if_fail(cs != NULL, NULL);
+ g_return_val_if_fail(cs->map != NULL, NULL);
+ return g_hash_table_lookup(cs->map, GUINT_TO_POINTER(chan));
+}
+
+
+void mwChannelSet_free(struct mwChannelSet *cs) {
+ if(! cs) return;
+ if(cs->map) g_hash_table_destroy(cs->map);
+ g_free(cs);
+}
+
+
+struct mwChannelSet *mwChannelSet_new(struct mwSession *s) {
+ struct mwChannelSet *cs = g_new0(struct mwChannelSet, 1);
+ cs->session = s;
+
+ /* for some reason, g_int_hash/g_int_equal cause a SIGSEGV */
+ cs->map = g_hash_table_new_full(g_direct_hash, g_direct_equal,
+ NULL, (GDestroyNotify) channel_free);
+ return cs;
+}
+
+
+void mwChannel_recvCreate(struct mwChannel *chan,
+ struct mwMsgChannelCreate *msg) {
+
+ struct mwSession *session;
+ GList *list;
+ struct mwService *srvc;
+
+ g_return_if_fail(chan != NULL);
+ g_return_if_fail(msg != NULL);
+ g_return_if_fail(chan->id == msg->channel);
+
+ session = chan->session;
+ g_return_if_fail(session != NULL);
+
+ if(mwChannel_isOutgoing(chan)) {
+ g_warning("channel 0x%08x not an incoming channel", chan->id);
+ mwChannel_destroy(chan, ERR_REQUEST_INVALID, NULL);
+ return;
+ }
+
+ chan->offered_policy = msg->encrypt.mode;
+ g_message("channel offered with encrypt policy 0x%04x", chan->policy);
+
+ for(list = msg->encrypt.items; list; list = list->next) {
+ struct mwEncryptItem *ei = list->data;
+ struct mwCipher *cipher;
+ struct mwCipherInstance *ci;
+
+ g_message("channel offered cipher id 0x%04x", ei->id);
+ cipher = mwSession_getCipher(session, ei->id);
+ if(! cipher) {
+ g_message("no such cipher found in session");
+ continue;
+ }
+
+ ci = mwCipher_newInstance(cipher, chan);
+ mwCipherInstance_offered(ci, ei);
+ mwChannel_addSupportedCipherInstance(chan, ci);
+ }
+
+ mwLoginInfo_clone(&chan->user, &msg->creator);
+ chan->service = msg->service;
+ chan->proto_type = msg->proto_type;
+ chan->proto_ver = msg->proto_ver;
+
+ srvc = mwSession_getService(session, msg->service);
+ if(srvc) {
+ mwService_recvCreate(srvc, chan, msg);
+
+ } else {
+ mwChannel_destroy(chan, ERR_SERVICE_NO_SUPPORT, NULL);
+ }
+}
+
+
+void mwChannel_recvAccept(struct mwChannel *chan,
+ struct mwMsgChannelAccept *msg) {
+
+ struct mwService *srvc;
+
+ g_return_if_fail(chan != NULL);
+ g_return_if_fail(msg != NULL);
+ g_return_if_fail(chan->id == msg->head.channel);
+
+ if(mwChannel_isIncoming(chan)) {
+ g_warning("channel 0x%08x not an outgoing channel", chan->id);
+ mwChannel_destroy(chan, ERR_REQUEST_INVALID, NULL);
+ return;
+ }
+
+ if(chan->state != mwChannel_WAIT) {
+ g_warning("channel 0x%08x state not WAIT: %s",
+ chan->id, state_str(chan->state));
+ mwChannel_destroy(chan, ERR_REQUEST_INVALID, NULL);
+ return;
+ }
+
+ mwLoginInfo_clone(&chan->user, &msg->acceptor);
+
+ srvc = mwSession_getService(chan->session, chan->service);
+ if(! srvc) {
+ g_warning("no service: 0x%08x", chan->service);
+ mwChannel_destroy(chan, ERR_SERVICE_NO_SUPPORT, NULL);
+ return;
+ }
+
+ chan->policy = msg->encrypt.mode;
+ g_message("channel accepted with encrypt policy 0x%04x", chan->policy);
+
+ if(! msg->encrypt.mode || ! msg->encrypt.item) {
+ /* no mode or no item means no encryption */
+ mwChannel_selectCipherInstance(chan, NULL);
+
+ } else {
+ guint16 cid = msg->encrypt.item->id;
+ struct mwCipherInstance *ci = get_supported(chan, cid);
+
+ if(! ci) {
+ g_warning("not an offered cipher: 0x%04x", cid);
+ mwChannel_destroy(chan, ERR_REQUEST_INVALID, NULL);
+ return;
+ }
+
+ mwCipherInstance_accepted(ci, msg->encrypt.item);
+ mwChannel_selectCipherInstance(chan, ci);
+ }
+
+ /* mark it as open for the service */
+ state(chan, mwChannel_OPEN, 0);
+
+ /* let the service know */
+ mwService_recvAccept(srvc, chan, msg);
+
+ /* flush it if the service didn't just immediately close it */
+ if(mwChannel_isState(chan, mwChannel_OPEN)) {
+ channel_open(chan);
+ }
+}
+
+
+void mwChannel_recvDestroy(struct mwChannel *chan,
+ struct mwMsgChannelDestroy *msg) {
+
+ struct mwChannelSet *cs;
+ struct mwService *srvc;
+
+ g_return_if_fail(chan != NULL);
+ g_return_if_fail(msg != NULL);
+ g_return_if_fail(chan->id == msg->head.channel);
+
+ state(chan, msg->reason? mwChannel_ERROR: mwChannel_DESTROY, msg->reason);
+
+ srvc = mwChannel_getService(chan);
+ if(srvc) mwService_recvDestroy(srvc, chan, msg);
+
+ cs = mwSession_getChannels(chan->session);
+ g_return_if_fail(cs != NULL);
+ g_return_if_fail(cs->map != NULL);
+
+ g_hash_table_remove(cs->map, GUINT_TO_POINTER(chan->id));
+}
+
+
+void mwChannel_populateSupportedCipherInstances(struct mwChannel *chan) {
+ struct mwSession *session;
+ GList *list;
+
+ g_return_if_fail(chan != NULL);
+
+ session = chan->session;
+ g_return_if_fail(session != NULL);
+
+ for(list = mwSession_getCiphers(session); list; list = list->next) {
+ struct mwCipherInstance *ci = mwCipher_newInstance(list->data, chan);
+ if(! ci) continue;
+ put_supported(chan, ci);
+ }
+}
+
+
+void mwChannel_addSupportedCipherInstance(struct mwChannel *chan,
+ struct mwCipherInstance *ci) {
+ g_return_if_fail(chan != NULL);
+ g_message("channel 0x%08x added cipher %s", chan->id,
+ NSTR(mwCipher_getName(mwCipherInstance_getCipher(ci))));
+ put_supported(chan, ci);
+}
+
+
+static void collect(gpointer a, gpointer b, gpointer c) {
+ GList **list = c;
+ *list = g_list_append(*list, b);
+}
+
+
+GList *mwChannel_getSupportedCipherInstances(struct mwChannel *chan) {
+ GList *list = NULL;
+
+ g_return_val_if_fail(chan != NULL, NULL);
+ g_hash_table_foreach(chan->supported, collect, &list);
+
+ return list;
+}
+
+
+void mwChannel_selectCipherInstance(struct mwChannel *chan,
+ struct mwCipherInstance *ci) {
+ struct mwCipher *c;
+
+ g_return_if_fail(chan != NULL);
+ g_return_if_fail(chan->supported != NULL);
+
+ chan->cipher = ci;
+ if(ci) {
+ guint cid;
+
+ c = mwCipherInstance_getCipher(ci);
+ cid = mwCipher_getType(c);
+
+ g_hash_table_steal(chan->supported, GUINT_TO_POINTER(cid));
+
+ switch(mwCipher_getType(c)) {
+ case mwCipher_RC2_40:
+ chan->policy = mwEncrypt_RC2_40;
+ break;
+
+ case mwCipher_RC2_128:
+ chan->policy = mwEncrypt_RC2_128;
+ break;
+
+ default:
+ /* unsure if this is bad */
+ chan->policy = mwEncrypt_WHATEVER;
+ }
+
+ g_message("channel 0x%08x selected cipher %s",
+ chan->id, NSTR(mwCipher_getName(c)));
+
+ } else {
+
+ chan->policy = mwEncrypt_NONE;
+ g_message("channel 0x%08x selected no cipher", chan->id);
+ }
+
+ g_hash_table_destroy(chan->supported);
+ chan->supported = NULL;
+}
+
+