diff options
Diffstat (limited to 'src/modules/m_spanningtree/treesocket1.cpp')
| -rw-r--r-- | src/modules/m_spanningtree/treesocket1.cpp | 1274 |
1 files changed, 1273 insertions, 1 deletions
diff --git a/src/modules/m_spanningtree/treesocket1.cpp b/src/modules/m_spanningtree/treesocket1.cpp index ad2588cab..a907bb440 100644 --- a/src/modules/m_spanningtree/treesocket1.cpp +++ b/src/modules/m_spanningtree/treesocket1.cpp @@ -1 +1,1273 @@ -/* +------------------------------------+
* | Inspire Internet Relay Chat Daemon |
* +------------------------------------+
*
* InspIRCd: (C) 2002-2007 InspIRCd Development Team
* See: http://www.inspircd.org/wiki/index.php/Credits
*
* This program is free but copyrighted software; see
* the file COPYING for details.
*
* ---------------------------------------------------
*/
#include "inspircd.h"
#include "configreader.h"
#include "users.h"
#include "channels.h"
#include "modules.h"
#include "commands/cmd_whois.h"
#include "commands/cmd_stats.h"
#include "socket.h"
#include "wildcard.h"
#include "xline.h"
#include "transport.h"
#include "m_hash.h"
#include "socketengine.h"
#include "m_spanningtree/main.h"
#include "m_spanningtree/utils.h"
#include "m_spanningtree/treeserver.h"
#include "m_spanningtree/link.h"
#include "m_spanningtree/treesocket.h"
#include "m_spanningtree/resolvers.h"
#include "m_spanningtree/handshaketimer.h"
/* $ModDep: m_spanningtree/timesynctimer.h m_spanningtree/resolvers.h m_spanningtree/main.h m_spanningtree/utils.h m_spanningtree/treeserver.h m_spanningtree/link.h m_spanningtree/treesocket.h m_hash.h */
/** Because most of the I/O gubbins are encapsulated within
* InspSocket, we just call the superclass constructor for
* most of the action, and append a few of our own values
* to it.
*/
TreeSocket::TreeSocket(SpanningTreeUtilities* Util, InspIRCd* SI, std::string host, int port, bool listening, unsigned long maxtime, Module* HookMod)
: InspSocket(SI, host, port, listening, maxtime), Utils(Util), Hook(HookMod)
{
myhost = host;
this->LinkState = LISTENER;
theirchallenge.clear();
ourchallenge.clear();
if (listening && Hook)
InspSocketHookRequest(this, (Module*)Utils->Creator, Hook).Send();
}
TreeSocket::TreeSocket(SpanningTreeUtilities* Util, InspIRCd* SI, std::string host, int port, bool listening, unsigned long maxtime, const std::string &ServerName, const std::string &bindto, Module* HookMod)
: InspSocket(SI, host, port, listening, maxtime, bindto), Utils(Util), Hook(HookMod)
{
myhost = ServerName;
theirchallenge.clear();
ourchallenge.clear();
this->LinkState = CONNECTING;
if (Hook)
InspSocketHookRequest(this, (Module*)Utils->Creator, Hook).Send();
}
/** When a listening socket gives us a new file descriptor,
* we must associate it with a socket without creating a new
* connection. This constructor is used for this purpose.
*/
TreeSocket::TreeSocket(SpanningTreeUtilities* Util, InspIRCd* SI, int newfd, char* ip, Module* HookMod)
: InspSocket(SI, newfd, ip), Utils(Util), Hook(HookMod)
{
this->LinkState = WAIT_AUTH_1;
theirchallenge.clear();
ourchallenge.clear();
sentcapab = false;
/* If we have a transport module hooked to the parent, hook the same module to this
* socket, and set a timer waiting for handshake before we send CAPAB etc.
*/
if (Hook)
InspSocketHookRequest(this, (Module*)Utils->Creator, Hook).Send();
Instance->Timers->AddTimer(new HandshakeTimer(Instance, this, &(Utils->LinkBlocks[0]), this->Utils, 1));
}
ServerState TreeSocket::GetLinkState()
{
return this->LinkState;
}
Module* TreeSocket::GetHook()
{
return this->Hook;
}
TreeSocket::~TreeSocket()
{
if (Hook)
InspSocketUnhookRequest(this, (Module*)Utils->Creator, Hook).Send();
Utils->DelBurstingServer(this);
}
const std::string& TreeSocket::GetOurChallenge()
{
return this->ourchallenge;
}
void TreeSocket::SetOurChallenge(const std::string &c)
{
this->ourchallenge = c;
}
const std::string& TreeSocket::GetTheirChallenge()
{
return this->theirchallenge;
}
void TreeSocket::SetTheirChallenge(const std::string &c)
{
this->theirchallenge = c;
}
std::string TreeSocket::MakePass(const std::string &password, const std::string &challenge)
{
/* This is a simple (maybe a bit hacky?) HMAC algorithm, thanks to jilles for
* suggesting the use of HMAC to secure the password against various attacks.
*
* Note: If m_sha256.so is not loaded, we MUST fall back to plaintext with no
* HMAC challenge/response.
*/
Module* sha256 = Instance->FindModule("m_sha256.so");
if (Utils->ChallengeResponse && sha256 && !challenge.empty())
{
/* XXX: This is how HMAC is supposed to be done:
*
* sha256( (pass xor 0x5c) + sha256((pass xor 0x36) + m) )
*
* Note that we are encoding the hex hash, not the binary
* output of the hash which is slightly different to standard.
*
* Don't ask me why its always 0x5c and 0x36... it just is.
*/
std::string hmac1, hmac2;
for (size_t n = 0; n < password.length(); n++)
{
hmac1 += static_cast<char>(password[n] ^ 0x5C);
hmac2 += static_cast<char>(password[n] ^ 0x36);
}
hmac2 += challenge;
HashResetRequest(Utils->Creator, sha256).Send();
hmac2 = HashSumRequest(Utils->Creator, sha256, hmac2).Send();
HashResetRequest(Utils->Creator, sha256).Send();
std::string hmac = hmac1 + hmac2;
hmac = HashSumRequest(Utils->Creator, sha256, hmac).Send();
return "HMAC-SHA256:"+ hmac;
}
else if (!challenge.empty() && !sha256)
Instance->Log(DEFAULT,"Not authenticating to server using SHA256/HMAC because we don't have m_sha256 loaded!");
return password;
}
/** When an outbound connection finishes connecting, we receive
* this event, and must send our SERVER string to the other
* side. If the other side is happy, as outlined in the server
* to server docs on the inspircd.org site, the other side
* will then send back its own server string.
*/
bool TreeSocket::OnConnected()
{
if (this->LinkState == CONNECTING)
{
/* we do not need to change state here. */
for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
{
if (x->Name == this->myhost)
{
this->Instance->SNO->WriteToSnoMask('l',"Connection to \2"+myhost+"\2["+(x->HiddenFromStats ? "<hidden>" : this->GetIP())+"] started.");
if (Hook)
{
InspSocketHookRequest(this, (Module*)Utils->Creator, Hook).Send();
this->Instance->SNO->WriteToSnoMask('l',"Connection to \2"+myhost+"\2["+(x->HiddenFromStats ? "<hidden>" : this->GetIP())+"] using transport \2"+x->Hook+"\2");
}
this->OutboundPass = x->SendPass;
sentcapab = false;
/* found who we're supposed to be connecting to, send the neccessary gubbins. */
if (this->GetHook())
Instance->Timers->AddTimer(new HandshakeTimer(Instance, this, &(*x), this->Utils, 1));
else
this->SendCapabilities();
return true;
}
}
}
/* There is a (remote) chance that between the /CONNECT and the connection
* being accepted, some muppet has removed the <link> block and rehashed.
* If that happens the connection hangs here until it's closed. Unlikely
* and rather harmless.
*/
this->Instance->SNO->WriteToSnoMask('l',"Connection to \2"+myhost+"\2 lost link tag(!)");
return true;
}
void TreeSocket::OnError(InspSocketError e)
{
Link* MyLink;
switch (e)
{
case I_ERR_CONNECT:
this->Instance->SNO->WriteToSnoMask('l',"Connection failed: Connection to \002"+myhost+"\002 refused");
MyLink = Utils->FindLink(myhost);
if (MyLink)
Utils->DoFailOver(MyLink);
break;
case I_ERR_SOCKET:
this->Instance->SNO->WriteToSnoMask('l',"Connection failed: Could not create socket");
break;
case I_ERR_BIND:
this->Instance->SNO->WriteToSnoMask('l',"Connection failed: Error binding socket to address or port");
break;
case I_ERR_WRITE:
this->Instance->SNO->WriteToSnoMask('l',"Connection failed: I/O error on connection");
break;
case I_ERR_NOMOREFDS:
this->Instance->SNO->WriteToSnoMask('l',"Connection failed: Operating system is out of file descriptors!");
break;
default:
if ((errno) && (errno != EINPROGRESS) && (errno != EAGAIN))
{
std::string errstr = strerror(errno);
this->Instance->SNO->WriteToSnoMask('l',"Connection to \002"+myhost+"\002 failed with OS error: " + errstr);
}
break;
}
}
int TreeSocket::OnDisconnect()
{
/* For the same reason as above, we don't
* handle OnDisconnect()
*/
return true;
}
/** Recursively send the server tree with distances as hops.
* This is used during network burst to inform the other server
* (and any of ITS servers too) of what servers we know about.
* If at any point any of these servers already exist on the other
* end, our connection may be terminated. The hopcounts given
* by this function are relative, this doesn't matter so long as
* they are all >1, as all the remote servers re-calculate them
* to be relative too, with themselves as hop 0.
*/
void TreeSocket::SendServers(TreeServer* Current, TreeServer* s, int hops)
{
char command[1024];
for (unsigned int q = 0; q < Current->ChildCount(); q++)
{
TreeServer* recursive_server = Current->GetChild(q);
if (recursive_server != s)
{
snprintf(command,1024,":%s SERVER %s * %d :%s",Current->GetName().c_str(),recursive_server->GetName().c_str(),hops,recursive_server->GetDesc().c_str());
this->WriteLine(command);
this->WriteLine(":"+recursive_server->GetName()+" VERSION :"+recursive_server->GetVersion());
/* down to next level */
this->SendServers(recursive_server, s, hops+1);
}
}
}
std::string TreeSocket::MyCapabilities()
{
std::vector<std::string> modlist;
std::string capabilities;
for (int i = 0; i <= this->Instance->GetModuleCount(); i++)
{
if (this->Instance->modules[i]->GetVersion().Flags & VF_COMMON)
modlist.push_back(this->Instance->Config->module_names[i]);
}
sort(modlist.begin(),modlist.end());
for (unsigned int i = 0; i < modlist.size(); i++)
{
if (i)
capabilities = capabilities + ",";
capabilities = capabilities + modlist[i];
}
return capabilities;
}
std::string TreeSocket::RandString(unsigned int length)
{
char* randombuf = new char[length+1];
std::string out;
#ifdef WINDOWS
int fd = -1;
#else
int fd = open("/dev/urandom", O_RDONLY, 0);
#endif
if (fd >= 0)
{
#ifndef WINDOWS
read(fd, randombuf, length);
close(fd);
#endif
}
else
{
for (unsigned int i = 0; i < length; i++)
randombuf[i] = rand();
}
for (unsigned int i = 0; i < length; i++)
{
char randchar = static_cast<char>((randombuf[i] & 0x7F) | 0x21);
out += (randchar == '=' ? '_' : randchar);
}
delete[] randombuf;
return out;
}
void TreeSocket::SendCapabilities()
{
if (sentcapab)
return;
sentcapab = true;
irc::commasepstream modulelist(MyCapabilities());
this->WriteLine("CAPAB START");
/* Send module names, split at 509 length */
std::string item = "*";
std::string line = "CAPAB MODULES ";
while ((item = modulelist.GetToken()) != "")
{
if (line.length() + item.length() + 1 > 509)
{
this->WriteLine(line);
line = "CAPAB MODULES ";
}
if (line != "CAPAB MODULES ")
line.append(",");
line.append(item);
}
if (line != "CAPAB MODULES ")
this->WriteLine(line);
int ip6 = 0;
int ip6support = 0;
#ifdef IPV6
ip6 = 1;
#endif
#ifdef SUPPORT_IP6LINKS
ip6support = 1;
#endif
std::string extra;
/* Do we have sha256 available? If so, we send a challenge */
if (Utils->ChallengeResponse && (Instance->FindModule("m_sha256.so")))
{
this->SetOurChallenge(RandString(20));
extra = " CHALLENGE=" + this->GetOurChallenge();
}
this->WriteLine("CAPAB CAPABILITIES :NICKMAX="+ConvToStr(NICKMAX)+" HALFOP="+ConvToStr(this->Instance->Config->AllowHalfop)+" CHANMAX="+ConvToStr(CHANMAX)+" MAXMODES="+ConvToStr(MAXMODES)+" IDENTMAX="+ConvToStr(IDENTMAX)+" MAXQUIT="+ConvToStr(MAXQUIT)+" MAXTOPIC="+ConvToStr(MAXTOPIC)+" MAXKICK="+ConvToStr(MAXKICK)+" MAXGECOS="+ConvToStr(MAXGECOS)+" MAXAWAY="+ConvToStr(MAXAWAY)+" IP6NATIVE="+ConvToStr(ip6)+" IP6SUPPORT="+ConvToStr(ip6support)+" PROTOCOL="+ConvToStr(ProtocolVersion)+extra+" PREFIX="+Instance->Modes->BuildPrefixes()+" CHANMODES="+Instance->Modes->ChanModes());
this->WriteLine("CAPAB END");
}
/* Check a comma seperated list for an item */
bool TreeSocket::HasItem(const std::string &list, const std::string &item)
{
irc::commasepstream seplist(list);
std::string item2 = "*";
while ((item2 = seplist.GetToken()) != "")
{
if (item2 == item)
return true;
}
return false;
}
/* Isolate and return the elements that are different between two comma seperated lists */
std::string TreeSocket::ListDifference(const std::string &one, const std::string &two)
{
irc::commasepstream list_one(one);
std::string item = "*";
std::string result;
while ((item = list_one.GetToken()) != "")
{
if (!HasItem(two, item))
{
result.append(" ");
result.append(item);
}
}
return result;
}
void TreeSocket::SendError(const std::string &errormessage)
{
/* Display the error locally as well as sending it remotely */
this->WriteLine("ERROR :"+errormessage);
this->Instance->SNO->WriteToSnoMask('l',"Sent \2ERROR\2 to "+this->InboundServerName+": "+errormessage);
/* One last attempt to make sure the error reaches its target */
this->FlushWriteBuffer();
}
bool TreeSocket::Capab(const std::deque<std::string> ¶ms)
{
if (params.size() < 1)
{
this->SendError("Invalid number of parameters for CAPAB - Mismatched version");
return false;
}
if (params[0] == "START")
{
this->ModuleList.clear();
this->CapKeys.clear();
}
else if (params[0] == "END")
{
std::string reason;
int ip6support = 0;
#ifdef SUPPORT_IP6LINKS
ip6support = 1;
#endif
/* Compare ModuleList and check CapKeys...
* Maybe this could be tidier? -- Brain
*/
if ((this->ModuleList != this->MyCapabilities()) && (this->ModuleList.length()))
{
std::string diff = ListDifference(this->ModuleList, this->MyCapabilities());
if (!diff.length())
{
diff = "your server:" + ListDifference(this->MyCapabilities(), this->ModuleList);
}
else
{
diff = "this server:" + diff;
}
if (diff.length() == 12)
reason = "Module list in CAPAB is not alphabetically ordered, cannot compare lists.";
else
reason = "Modules loaded on these servers are not correctly matched, these modules are not loaded on " + diff;
}
cap_validation valid_capab[] = {
{"Maximum nickname lengths differ or remote nickname length not specified", "NICKMAX", NICKMAX},
{"Maximum ident lengths differ or remote ident length not specified", "IDENTMAX", IDENTMAX},
{"Maximum channel lengths differ or remote channel length not specified", "CHANMAX", CHANMAX},
{"Maximum modes per line differ or remote modes per line not specified", "MAXMODES", MAXMODES},
{"Maximum quit lengths differ or remote quit length not specified", "MAXQUIT", MAXQUIT},
{"Maximum topic lengths differ or remote topic length not specified", "MAXTOPIC", MAXTOPIC},
{"Maximum kick lengths differ or remote kick length not specified", "MAXKICK", MAXKICK},
{"Maximum GECOS (fullname) lengths differ or remote GECOS length not specified", "MAXGECOS", MAXGECOS},
{"Maximum awaymessage lengths differ or remote awaymessage length not specified", "MAXAWAY", MAXAWAY},
{"", "", 0}
};
if (((this->CapKeys.find("IP6SUPPORT") == this->CapKeys.end()) && (ip6support)) || ((this->CapKeys.find("IP6SUPPORT") != this->CapKeys.end()) && (this->CapKeys.find("IP6SUPPORT")->second != ConvToStr(ip6support))))
reason = "We don't both support linking to IPV6 servers";
if (((this->CapKeys.find("IP6NATIVE") != this->CapKeys.end()) && (this->CapKeys.find("IP6NATIVE")->second == "1")) && (!ip6support))
reason = "The remote server is IPV6 native, and we don't support linking to IPV6 servers";
if (((this->CapKeys.find("PROTOCOL") == this->CapKeys.end()) || ((this->CapKeys.find("PROTOCOL") != this->CapKeys.end()) && (this->CapKeys.find("PROTOCOL")->second != ConvToStr(ProtocolVersion)))))
{
if (this->CapKeys.find("PROTOCOL") != this->CapKeys.end())
reason = "Mismatched protocol versions "+this->CapKeys.find("PROTOCOL")->second+" and "+ConvToStr(ProtocolVersion);
else
reason = "Protocol version not specified";
}
if(this->CapKeys.find("PREFIX") != this->CapKeys.end() && this->CapKeys.find("PREFIX")->second != this->Instance->Modes->BuildPrefixes())
reason = "One or more of the prefixes on the remote server are invalid on this server.";
if (((this->CapKeys.find("HALFOP") == this->CapKeys.end()) && (Instance->Config->AllowHalfop)) || ((this->CapKeys.find("HALFOP") != this->CapKeys.end()) && (this->CapKeys.find("HALFOP")->second != ConvToStr(Instance->Config->AllowHalfop))))
reason = "We don't both have halfop support enabled/disabled identically";
for (int x = 0; valid_capab[x].size; ++x)
{
if (((this->CapKeys.find(valid_capab[x].key) == this->CapKeys.end()) || ((this->CapKeys.find(valid_capab[x].key) != this->CapKeys.end()) &&
(this->CapKeys.find(valid_capab[x].key)->second != ConvToStr(valid_capab[x].size)))))
reason = valid_capab[x].reason;
}
/* Challenge response, store their challenge for our password */
std::map<std::string,std::string>::iterator n = this->CapKeys.find("CHALLENGE");
if (Utils->ChallengeResponse && (n != this->CapKeys.end()) && (Instance->FindModule("m_sha256.so")))
{
/* Challenge-response is on now */
this->SetTheirChallenge(n->second);
if (!this->GetTheirChallenge().empty() && (this->LinkState == CONNECTING))
{
this->WriteLine(std::string("SERVER ")+this->Instance->Config->ServerName+" "+this->MakePass(OutboundPass, this->GetTheirChallenge())+" 0 :"+this->Instance->Config->ServerDesc);
}
}
else
{
/* They didnt specify a challenge or we don't have m_sha256.so, we use plaintext */
if (this->LinkState == CONNECTING)
this->WriteLine(std::string("SERVER ")+this->Instance->Config->ServerName+" "+OutboundPass+" 0 :"+this->Instance->Config->ServerDesc);
}
if (reason.length())
{
this->SendError("CAPAB negotiation failed: "+reason);
return false;
}
}
else if ((params[0] == "MODULES") && (params.size() == 2))
{
if (!this->ModuleList.length())
{
this->ModuleList.append(params[1]);
}
else
{
this->ModuleList.append(",");
this->ModuleList.append(params[1]);
}
}
else if ((params[0] == "CAPABILITIES") && (params.size() == 2))
{
irc::tokenstream capabs(params[1]);
std::string item;
bool more = true;
while ((more = capabs.GetToken(item)))
{
/* Process each key/value pair */
std::string::size_type equals = item.rfind('=');
if (equals != std::string::npos)
{
std::string var = item.substr(0, equals);
std::string value = item.substr(equals+1, item.length());
CapKeys[var] = value;
}
}
}
return true;
}
/** This function forces this server to quit, removing this server
* and any users on it (and servers and users below that, etc etc).
* It's very slow and pretty clunky, but luckily unless your network
* is having a REAL bad hair day, this function shouldnt be called
* too many times a month ;-)
*/
void TreeSocket::SquitServer(std::string &from, TreeServer* Current)
{
/* recursively squit the servers attached to 'Current'.
* We're going backwards so we don't remove users
* while we still need them ;)
*/
for (unsigned int q = 0; q < Current->ChildCount(); q++)
{
TreeServer* recursive_server = Current->GetChild(q);
this->SquitServer(from,recursive_server);
}
/* Now we've whacked the kids, whack self */
num_lost_servers++;
num_lost_users += Current->QuitUsers(from);
}
/** This is a wrapper function for SquitServer above, which
* does some validation first and passes on the SQUIT to all
* other remaining servers.
*/
void TreeSocket::Squit(TreeServer* Current, const std::string &reason)
{
if ((Current) && (Current != Utils->TreeRoot))
{
Event rmode((char*)Current->GetName().c_str(), (Module*)Utils->Creator, "lost_server");
rmode.Send(Instance);
std::deque<std::string> params;
params.push_back(Current->GetName());
params.push_back(":"+reason);
Utils->DoOneToAllButSender(Current->GetParent()->GetName(),"SQUIT",params,Current->GetName());
if (Current->GetParent() == Utils->TreeRoot)
{
this->Instance->SNO->WriteToSnoMask('l',"Server \002"+Current->GetName()+"\002 split: "+reason);
}
else
{
this->Instance->SNO->WriteToSnoMask('l',"Server \002"+Current->GetName()+"\002 split from server \002"+Current->GetParent()->GetName()+"\002 with reason: "+reason);
}
num_lost_servers = 0;
num_lost_users = 0;
std::string from = Current->GetParent()->GetName()+" "+Current->GetName();
SquitServer(from, Current);
Current->Tidy();
Current->GetParent()->DelChild(Current);
DELETE(Current);
this->Instance->SNO->WriteToSnoMask('l',"Netsplit complete, lost \002%d\002 users on \002%d\002 servers.", num_lost_users, num_lost_servers);
}
else
Instance->Log(DEFAULT,"Squit from unknown server");
}
/** FMODE command - server mode with timestamp checks */
bool TreeSocket::ForceMode(const std::string &source, std::deque<std::string> ¶ms)
{
/* Chances are this is a 1.0 FMODE without TS */
if (params.size() < 3)
{
/* No modes were in the command, probably a channel with no modes set on it */
return true;
}
bool smode = false;
std::string sourceserv;
/* Are we dealing with an FMODE from a user, or from a server? */
userrec* who = this->Instance->FindNick(source);
if (who)
{
/* FMODE from a user, set sourceserv to the users server name */
sourceserv = who->server;
}
else
{
/* FMODE from a server, create a fake user to receive mode feedback */
who = new userrec(this->Instance);
who->SetFd(FD_MAGIC_NUMBER);
smode = true; /* Setting this flag tells us we should free the userrec later */
sourceserv = source; /* Set sourceserv to the actual source string */
}
const char* modelist[64];
time_t TS = 0;
int n = 0;
memset(&modelist,0,sizeof(modelist));
for (unsigned int q = 0; (q < params.size()) && (q < 64); q++)
{
if (q == 1)
{
/* The timestamp is in this position.
* We don't want to pass that up to the
* server->client protocol!
*/
TS = atoi(params[q].c_str());
}
else
{
/* Everything else is fine to append to the modelist */
modelist[n++] = params[q].c_str();
}
}
/* Extract the TS value of the object, either userrec or chanrec */
userrec* dst = this->Instance->FindNick(params[0]);
chanrec* chan = NULL;
time_t ourTS = 0;
if (dst)
{
ourTS = dst->age;
}
else
{
chan = this->Instance->FindChan(params[0]);
if (chan)
{
ourTS = chan->age;
}
else
/* Oops, channel doesnt exist! */
return true;
}
if (!TS)
{
Instance->Log(DEFAULT,"*** BUG? *** TS of 0 sent to FMODE. Are some services authors smoking craq, or is it 1970 again?. Dropped.");
Instance->SNO->WriteToSnoMask('d', "WARNING: The server %s is sending FMODE with a TS of zero. Total craq. Mode was dropped.", sourceserv.c_str());
return true;
}
/* TS is equal or less: Merge the mode changes into ours and pass on.
*/
if (TS <= ourTS)
{
if ((TS < ourTS) && (!dst))
Instance->Log(DEFAULT,"*** BUG *** Channel TS sent in FMODE to %s is %lu which is not equal to %lu!", params[0].c_str(), TS, ourTS);
if (smode)
{
this->Instance->SendMode(modelist, n, who);
}
else
{
this->Instance->CallCommandHandler("MODE", modelist, n, who);
}
/* HOT POTATO! PASS IT ON! */
Utils->DoOneToAllButSender(source,"FMODE",params,sourceserv);
}
/* If the TS is greater than ours, we drop the mode and dont pass it anywhere.
*/
if (smode)
DELETE(who);
return true;
}
/** FTOPIC command */
bool TreeSocket::ForceTopic(const std::string &source, std::deque<std::string> ¶ms)
{
if (params.size() != 4)
return true;
time_t ts = atoi(params[1].c_str());
std::string nsource = source;
chanrec* c = this->Instance->FindChan(params[0]);
if (c)
{
if ((ts >= c->topicset) || (!*c->topic))
{
std::string oldtopic = c->topic;
strlcpy(c->topic,params[3].c_str(),MAXTOPIC);
strlcpy(c->setby,params[2].c_str(),127);
c->topicset = ts;
/* if the topic text is the same as the current topic,
* dont bother to send the TOPIC command out, just silently
* update the set time and set nick.
*/
if (oldtopic != params[3])
{
userrec* user = this->Instance->FindNick(source);
if (!user)
{
c->WriteChannelWithServ(Instance->Config->ServerName, "TOPIC %s :%s", c->name, c->topic);
}
else
{
c->WriteChannel(user, "TOPIC %s :%s", c->name, c->topic);
nsource = user->server;
}
/* all done, send it on its way */
params[3] = ":" + params[3];
Utils->DoOneToAllButSender(source,"FTOPIC",params,nsource);
}
}
}
return true;
}
/** FJOIN, similar to TS6 SJOIN, but not quite. */
bool TreeSocket::ForceJoin(const std::string &source, std::deque<std::string> ¶ms)
{
/* 1.1 FJOIN works as follows:
*
* Each FJOIN is sent along with a timestamp, and the side with the lowest
* timestamp 'wins'. From this point on we will refer to this side as the
* winner. The side with the higher timestamp loses, from this point on we
* will call this side the loser or losing side. This should be familiar to
* anyone who's dealt with dreamforge or TS6 before.
*
* When two sides of a split heal and this occurs, the following things
* will happen:
*
* If the timestamps are exactly equal, both sides merge their privilages
* and users, as in InspIRCd 1.0 and ircd2.8. The channels have not been
* re-created during a split, this is safe to do.
*
* If the timestamps are NOT equal, the losing side removes all of its
* modes from the channel, before introducing new users into the channel
* which are listed in the FJOIN command's parameters. The losing side then
* LOWERS its timestamp value of the channel to match that of the winning
* side, and the modes of the users of the winning side are merged in with
* the losing side.
*
* The winning side on the other hand will ignore all user modes from the
* losing side, so only its own modes get applied. Life is simple for those
* who succeed at internets. :-)
*
* NOTE: Unlike TS6 and dreamforge and other protocols which have SJOIN,
* FJOIN does not contain the simple-modes such as +iklmnsp. Why not,
* you ask? Well, quite simply because we don't need to. They'll be sent
* after the FJOIN by FMODE, and FMODE is timestamped, so in the event
* the losing side sends any modes for the channel which shouldnt win,
* they wont as their timestamp will be too high :-)
*/
if (params.size() < 3)
return true;
irc::modestacker modestack(true); /* Modes to apply from the users in the user list */
userrec* who = NULL; /* User we are currently checking */
std::string channel = params[0]; /* Channel name, as a string */
time_t TS = atoi(params[1].c_str()); /* Timestamp given to us for remote side */
irc::tokenstream users(params[2]); /* Users from the user list */
bool apply_other_sides_modes = true; /* True if we are accepting the other side's modes */
chanrec* chan = this->Instance->FindChan(channel); /* The channel we're sending joins to */
time_t ourTS = chan ? chan->age : Instance->Time(true)+600; /* The TS of our side of the link */
bool created = !chan; /* True if the channel doesnt exist here yet */
std::string item; /* One item in the list of nicks */
params[2] = ":" + params[2];
Utils->DoOneToAllButSender(source,"FJOIN",params,source);
if (!TS)
{
Instance->Log(DEFAULT,"*** BUG? *** TS of 0 sent to FJOIN. Are some services authors smoking craq, or is it 1970 again?. Dropped.");
Instance->SNO->WriteToSnoMask('d', "WARNING: The server %s is sending FJOIN with a TS of zero. Total craq. Command was dropped.", source.c_str());
return true;
}
/* If our TS is less than theirs, we dont accept their modes */
if (ourTS < TS)
apply_other_sides_modes = false;
/* Our TS greater than theirs, clear all our modes from the channel, accept theirs. */
if (ourTS > TS)
{
std::deque<std::string> param_list;
if (Utils->AnnounceTSChange && chan)
chan->WriteChannelWithServ(Instance->Config->ServerName, "NOTICE %s :TS for %s changed from %lu to %lu", chan->name, chan->name, ourTS, TS);
ourTS = TS;
if (!created)
{
chan->age = TS;
param_list.push_back(channel);
this->RemoveStatus(Instance->Config->ServerName, param_list);
}
}
/* Now, process every 'prefixes,nick' pair */
while (users.GetToken(item))
{
const char* usr = item.c_str();
if (usr && *usr)
{
const char* permissions = usr;
/* Iterate through all the prefix values, convert them from prefixes to mode letters */
std::string modes;
while ((*permissions) && (*permissions != ','))
{
ModeHandler* mh = Instance->Modes->FindPrefix(*permissions);
if (mh)
modes = modes + mh->GetModeChar();
else
{
this->SendError(std::string("Invalid prefix '")+(*permissions)+"' in FJOIN");
return false;
}
usr++;
permissions++;
}
/* Advance past the comma, to the nick */
usr++;
/* Check the user actually exists */
who = this->Instance->FindNick(usr);
if (who)
{
/* Check that the user's 'direction' is correct */
TreeServer* route_back_again = Utils->BestRouteTo(who->server);
if ((!route_back_again) || (route_back_again->GetSocket() != this))
continue;
/* Add any permissions this user had to the mode stack */
for (std::string::iterator x = modes.begin(); x != modes.end(); ++x)
modestack.Push(*x, who->nick);
chanrec::JoinUser(this->Instance, who, channel.c_str(), true, "", TS);
}
else
{
Instance->Log(SPARSE,"Warning! Invalid user %s in FJOIN to channel %s IGNORED", usr, channel.c_str());
continue;
}
}
}
/* Flush mode stacker if we lost the FJOIN or had equal TS */
if (apply_other_sides_modes)
{
std::deque<std::string> stackresult;
const char* mode_junk[MAXMODES+2];
userrec* n = new userrec(Instance);
n->SetFd(FD_MAGIC_NUMBER);
mode_junk[0] = channel.c_str();
while (modestack.GetStackedLine(stackresult))
{
for (size_t j = 0; j < stackresult.size(); j++)
{
mode_junk[j+1] = stackresult[j].c_str();
}
Instance->SendMode(mode_junk, stackresult.size() + 1, n);
}
delete n;
}
return true;
}
/** NICK command */
bool TreeSocket::IntroduceClient(const std::string &source, std::deque<std::string> ¶ms)
{
/** Do we have enough parameters:
* NICK age nick host dhost ident +modes ip :gecos
*/
if (params.size() != 8)
{
this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" KILL "+params[1]+" :Invalid client introduction ("+params[1]+"?)");
return true;
}
time_t age = ConvToInt(params[0]);
const char* tempnick = params[1].c_str();
cmd_validation valid[] = { {"Nickname", 1, NICKMAX}, {"Hostname", 2, 64}, {"Displayed hostname", 3, 64}, {"Ident", 4, IDENTMAX}, {"GECOS", 7, MAXGECOS}, {"", 0, 0} };
TreeServer* remoteserver = Utils->FindServer(source);
if (!remoteserver)
{
this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" KILL "+params[1]+" :Invalid client introduction (Unknown server "+source+")");
return true;
}
/* Check parameters for validity before introducing the client, discovered by dmb */
if (!age)
{
this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" KILL "+params[1]+" :Invalid client introduction (Invalid TS?)");
return true;
}
for (size_t x = 0; valid[x].length; ++x)
{
if (params[valid[x].param].length() > valid[x].length)
{
this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" KILL "+params[1]+" :Invalid client introduction (" + valid[x].item + " > " + ConvToStr(valid[x].length) + ")");
return true;
}
}
/** Our client looks ok, lets introduce it now
*/
Instance->Log(DEBUG,"New remote client %s",tempnick);
user_hash::iterator iter = this->Instance->clientlist->find(tempnick);
if (iter != this->Instance->clientlist->end())
{
/* nick collision */
this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" KILL "+tempnick+" :Nickname collision");
userrec::QuitUser(this->Instance, iter->second, "Nickname collision");
return true;
}
userrec* _new = new userrec(this->Instance);
(*(this->Instance->clientlist))[tempnick] = _new;
_new->SetFd(FD_MAGIC_NUMBER);
strlcpy(_new->nick, tempnick,NICKMAX-1);
strlcpy(_new->host, params[2].c_str(),64);
strlcpy(_new->dhost, params[3].c_str(),64);
_new->server = this->Instance->FindServerNamePtr(source.c_str());
strlcpy(_new->ident, params[4].c_str(),IDENTMAX);
strlcpy(_new->fullname, params[7].c_str(),MAXGECOS);
_new->registered = REG_ALL;
_new->signon = age;
/* we need to remove the + from the modestring, so we can do our stuff */
std::string::size_type pos_after_plus = params[5].find_first_not_of('+');
if (pos_after_plus != std::string::npos)
params[5] = params[5].substr(pos_after_plus);
for (std::string::iterator v = params[5].begin(); v != params[5].end(); v++)
{
_new->modes[(*v)-65] = 1;
/* For each mode thats set, increase counter */
ModeHandler* mh = Instance->Modes->FindMode(*v, MODETYPE_USER);
if (mh)
mh->ChangeCount(1);
}
/* now we've done with modes processing, put the + back for remote servers */
params[5] = "+" + params[5];
#ifdef SUPPORT_IP6LINKS
if (params[6].find_first_of(":") != std::string::npos)
_new->SetSockAddr(AF_INET6, params[6].c_str(), 0);
else
#endif
_new->SetSockAddr(AF_INET, params[6].c_str(), 0);
Instance->AddGlobalClone(_new);
bool dosend = !(((this->Utils->quiet_bursts) && (this->bursting || Utils->FindRemoteBurstServer(remoteserver))) || (this->Instance->SilentULine(_new->server)));
if (dosend)
this->Instance->SNO->WriteToSnoMask('C',"Client connecting at %s: %s!%s@%s [%s] [%s]",_new->server,_new->nick,_new->ident,_new->host, _new->GetIPString(), _new->fullname);
params[7] = ":" + params[7];
Utils->DoOneToAllButSender(source,"NICK", params, source);
// Increment the Source Servers User Count..
TreeServer* SourceServer = Utils->FindServer(source);
if (SourceServer)
{
SourceServer->AddUserCount();
}
FOREACH_MOD_I(Instance,I_OnPostConnect,OnPostConnect(_new));
return true;
}
/** Send one or more FJOINs for a channel of users.
* If the length of a single line is more than 480-NICKMAX
* in length, it is split over multiple lines.
*/
void TreeSocket::SendFJoins(TreeServer* Current, chanrec* c)
{
std::string buffer;
char list[MAXBUF];
std::string individual_halfops = std::string(":")+this->Instance->Config->ServerName+" FMODE "+c->name+" "+ConvToStr(c->age);
size_t dlen, curlen;
dlen = curlen = snprintf(list,MAXBUF,":%s FJOIN %s %lu",this->Instance->Config->ServerName,c->name,(unsigned long)c->age);
int numusers = 0;
char* ptr = list + dlen;
CUList *ulist = c->GetUsers();
std::string modes;
std::string params;
for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
{
// The first parameter gets a : before it
size_t ptrlen = snprintf(ptr, MAXBUF, " %s%s,%s", !numusers ? ":" : "", c->GetAllPrefixChars(i->first), i->first->nick);
curlen += ptrlen;
ptr += ptrlen;
numusers++;
if (curlen > (480-NICKMAX))
{
buffer.append(list).append("\r\n");
dlen = curlen = snprintf(list,MAXBUF,":%s FJOIN %s %lu",this->Instance->Config->ServerName,c->name,(unsigned long)c->age);
ptr = list + dlen;
ptrlen = 0;
numusers = 0;
}
}
if (numusers)
buffer.append(list).append("\r\n");
buffer.append(":").append(this->Instance->Config->ServerName).append(" FMODE ").append(c->name).append(" ").append(ConvToStr(c->age)).append(" +").append(c->ChanModes(true)).append("\r\n");
int linesize = 1;
for (BanList::iterator b = c->bans.begin(); b != c->bans.end(); b++)
{
int size = strlen(b->data) + 2;
int currsize = linesize + size;
if (currsize <= 350)
{
modes.append("b");
params.append(" ").append(b->data);
linesize += size;
}
if ((params.length() >= MAXMODES) || (currsize > 350))
{
/* Wrap at MAXMODES */
buffer.append(":").append(this->Instance->Config->ServerName).append(" FMODE ").append(c->name).append(" ").append(ConvToStr(c->age)).append(" +").append(modes).append(params).append("\r\n");
modes.clear();
params.clear();
linesize = 1;
}
}
/* Only send these if there are any */
if (!modes.empty())
buffer.append(":").append(this->Instance->Config->ServerName).append(" FMODE ").append(c->name).append(" ").append(ConvToStr(c->age)).append(" +").append(modes).append(params);
this->WriteLine(buffer);
}
/** Send G, Q, Z and E lines */
void TreeSocket::SendXLines(TreeServer* Current)
{
char data[MAXBUF];
std::string buffer;
std::string n = this->Instance->Config->ServerName;
const char* sn = n.c_str();
/* Yes, these arent too nice looking, but they get the job done */
for (std::vector<ZLine*>::iterator i = Instance->XLines->zlines.begin(); i != Instance->XLines->zlines.end(); i++)
{
snprintf(data,MAXBUF,":%s ADDLINE Z %s %s %lu %lu :%s\r\n",sn,(*i)->ipaddr,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
buffer.append(data);
}
for (std::vector<QLine*>::iterator i = Instance->XLines->qlines.begin(); i != Instance->XLines->qlines.end(); i++)
{
snprintf(data,MAXBUF,":%s ADDLINE Q %s %s %lu %lu :%s\r\n",sn,(*i)->nick,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
buffer.append(data);
}
for (std::vector<GLine*>::iterator i = Instance->XLines->glines.begin(); i != Instance->XLines->glines.end(); i++)
{
snprintf(data,MAXBUF,":%s ADDLINE G %s@%s %s %lu %lu :%s\r\n",sn,(*i)->identmask,(*i)->hostmask,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
buffer.append(data);
}
for (std::vector<ELine*>::iterator i = Instance->XLines->elines.begin(); i != Instance->XLines->elines.end(); i++)
{
snprintf(data,MAXBUF,":%s ADDLINE E %s@%s %s %lu %lu :%s\r\n",sn,(*i)->identmask,(*i)->hostmask,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
buffer.append(data);
}
for (std::vector<ZLine*>::iterator i = Instance->XLines->pzlines.begin(); i != Instance->XLines->pzlines.end(); i++)
{
snprintf(data,MAXBUF,":%s ADDLINE Z %s %s %lu %lu :%s\r\n",sn,(*i)->ipaddr,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
buffer.append(data);
}
for (std::vector<QLine*>::iterator i = Instance->XLines->pqlines.begin(); i != Instance->XLines->pqlines.end(); i++)
{
snprintf(data,MAXBUF,":%s ADDLINE Q %s %s %lu %lu :%s\r\n",sn,(*i)->nick,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
buffer.append(data);
}
for (std::vector<GLine*>::iterator i = Instance->XLines->pglines.begin(); i != Instance->XLines->pglines.end(); i++)
{
snprintf(data,MAXBUF,":%s ADDLINE G %s@%s %s %lu %lu :%s\r\n",sn,(*i)->identmask,(*i)->hostmask,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
buffer.append(data);
}
for (std::vector<ELine*>::iterator i = Instance->XLines->pelines.begin(); i != Instance->XLines->pelines.end(); i++)
{
snprintf(data,MAXBUF,":%s ADDLINE E %s@%s %s %lu %lu :%s\r\n",sn,(*i)->identmask,(*i)->hostmask,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
buffer.append(data);
}
if (!buffer.empty())
this->WriteLine(buffer);
}
/** Send channel modes and topics */
void TreeSocket::SendChannelModes(TreeServer* Current)
{
char data[MAXBUF];
std::deque<std::string> list;
std::string n = this->Instance->Config->ServerName;
const char* sn = n.c_str();
Instance->Log(DEBUG,"Sending channels and modes, %d to send", this->Instance->chanlist->size());
for (chan_hash::iterator c = this->Instance->chanlist->begin(); c != this->Instance->chanlist->end(); c++)
{
SendFJoins(Current, c->second);
if (*c->second->topic)
{
snprintf(data,MAXBUF,":%s FTOPIC %s %lu %s :%s",sn,c->second->name,(unsigned long)c->second->topicset,c->second->setby,c->second->topic);
this->WriteLine(data);
}
FOREACH_MOD_I(this->Instance,I_OnSyncChannel,OnSyncChannel(c->second,(Module*)Utils->Creator,(void*)this));
list.clear();
c->second->GetExtList(list);
for (unsigned int j = 0; j < list.size(); j++)
{
FOREACH_MOD_I(this->Instance,I_OnSyncChannelMetaData,OnSyncChannelMetaData(c->second,(Module*)Utils->Creator,(void*)this,list[j]));
}
}
}
/** send all users and their oper state/modes */
void TreeSocket::SendUsers(TreeServer* Current)
{
char data[MAXBUF];
std::deque<std::string> list;
std::string dataline;
for (user_hash::iterator u = this->Instance->clientlist->begin(); u != this->Instance->clientlist->end(); u++)
{
if (u->second->registered == REG_ALL)
{
snprintf(data,MAXBUF,":%s NICK %lu %s %s %s %s +%s %s :%s",u->second->server,(unsigned long)u->second->age,u->second->nick,u->second->host,u->second->dhost,u->second->ident,u->second->FormatModes(),u->second->GetIPString(),u->second->fullname);
this->WriteLine(data);
if (*u->second->oper)
{
snprintf(data,MAXBUF,":%s OPERTYPE %s", u->second->nick, u->second->oper);
this->WriteLine(data);
}
if (*u->second->awaymsg)
{
snprintf(data,MAXBUF,":%s AWAY :%s", u->second->nick, u->second->awaymsg);
this->WriteLine(data);
}
}
}
for (user_hash::iterator u = this->Instance->clientlist->begin(); u != this->Instance->clientlist->end(); u++)
{
FOREACH_MOD_I(this->Instance,I_OnSyncUser,OnSyncUser(u->second,(Module*)Utils->Creator,(void*)this));
list.clear();
u->second->GetExtList(list);
for (unsigned int j = 0; j < list.size(); j++)
{
FOREACH_MOD_I(this->Instance,I_OnSyncUserMetaData,OnSyncUserMetaData(u->second,(Module*)Utils->Creator,(void*)this,list[j]));
}
}
}
/** This function is called when we want to send a netburst to a local
* server. There is a set order we must do this, because for example
* users require their servers to exist, and channels require their
* users to exist. You get the idea.
*/
void TreeSocket::DoBurst(TreeServer* s)
{
std::string name = s->GetName();
std::string burst = "BURST "+ConvToStr(Instance->Time(true));
std::string endburst = "ENDBURST";
this->Instance->SNO->WriteToSnoMask('l',"Bursting to \2%s\2 (Authentication: %s).", name.c_str(), this->GetTheirChallenge().empty() ? "plaintext password" : "SHA256-HMAC challenge-response");
this->WriteLine(burst);
/* send our version string */
this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" VERSION :"+this->Instance->GetVersionString());
/* Send server tree */
this->SendServers(Utils->TreeRoot,s,1);
/* Send users and their oper status */
this->SendUsers(s);
/* Send everything else (channel modes, xlines etc) */
this->SendChannelModes(s);
this->SendXLines(s);
FOREACH_MOD_I(this->Instance,I_OnSyncOtherMetaData,OnSyncOtherMetaData((Module*)Utils->Creator,(void*)this));
this->WriteLine(endburst);
this->Instance->SNO->WriteToSnoMask('l',"Finished bursting to \2"+name+"\2.");
}
/** This function is called when we receive data from a remote
* server. We buffer the data in a std::string (it doesnt stay
* there for long), reading using InspSocket::Read() which can
* read up to 16 kilobytes in one operation.
*
* IF THIS FUNCTION RETURNS FALSE, THE CORE CLOSES AND DELETES
* THE SOCKET OBJECT FOR US.
*/
bool TreeSocket::OnDataReady()
{
char* data = this->Read();
/* Check that the data read is a valid pointer and it has some content */
if (data && *data)
{
this->in_buffer.append(data);
/* While there is at least one new line in the buffer,
* do something useful (we hope!) with it.
*/
while (in_buffer.find("\n") != std::string::npos)
{
std::string ret = in_buffer.substr(0,in_buffer.find("\n")-1);
in_buffer = in_buffer.substr(in_buffer.find("\n")+1,in_buffer.length()-in_buffer.find("\n"));
/* Use rfind here not find, as theres more
* chance of the \r being near the end of the
* string, not the start.
*/
if (ret.find("\r") != std::string::npos)
ret = in_buffer.substr(0,in_buffer.find("\r")-1);
/* Process this one, abort if it
* didnt return true.
*/
if (!this->ProcessLine(ret))
{
return false;
}
}
return true;
}
/* EAGAIN returns an empty but non-NULL string, so this
* evaluates to TRUE for EAGAIN but to FALSE for EOF.
*/
return (data && !*data);
}
\ No newline at end of file +/* +------------------------------------+ + * | Inspire Internet Relay Chat Daemon | + * +------------------------------------+ + * + * InspIRCd: (C) 2002-2007 InspIRCd Development Team + * See: http://www.inspircd.org/wiki/index.php/Credits + * + * This program is free but copyrighted software; see + * the file COPYING for details. + * + * --------------------------------------------------- + */ + +#include "inspircd.h" +#include "configreader.h" +#include "users.h" +#include "channels.h" +#include "modules.h" +#include "commands/cmd_whois.h" +#include "commands/cmd_stats.h" +#include "socket.h" +#include "wildcard.h" +#include "xline.h" +#include "transport.h" +#include "m_hash.h" +#include "socketengine.h" + +#include "m_spanningtree/main.h" +#include "m_spanningtree/utils.h" +#include "m_spanningtree/treeserver.h" +#include "m_spanningtree/link.h" +#include "m_spanningtree/treesocket.h" +#include "m_spanningtree/resolvers.h" +#include "m_spanningtree/handshaketimer.h" + +/* $ModDep: m_spanningtree/timesynctimer.h m_spanningtree/resolvers.h m_spanningtree/main.h m_spanningtree/utils.h m_spanningtree/treeserver.h m_spanningtree/link.h m_spanningtree/treesocket.h m_hash.h */ + + +/** Because most of the I/O gubbins are encapsulated within + * InspSocket, we just call the superclass constructor for + * most of the action, and append a few of our own values + * to it. + */ +TreeSocket::TreeSocket(SpanningTreeUtilities* Util, InspIRCd* SI, std::string host, int port, bool listening, unsigned long maxtime, Module* HookMod) + : InspSocket(SI, host, port, listening, maxtime), Utils(Util), Hook(HookMod) +{ + myhost = host; + this->LinkState = LISTENER; + theirchallenge.clear(); + ourchallenge.clear(); + if (listening && Hook) + InspSocketHookRequest(this, (Module*)Utils->Creator, Hook).Send(); +} + +TreeSocket::TreeSocket(SpanningTreeUtilities* Util, InspIRCd* SI, std::string host, int port, bool listening, unsigned long maxtime, const std::string &ServerName, const std::string &bindto, Module* HookMod) + : InspSocket(SI, host, port, listening, maxtime, bindto), Utils(Util), Hook(HookMod) +{ + myhost = ServerName; + theirchallenge.clear(); + ourchallenge.clear(); + this->LinkState = CONNECTING; + if (Hook) + InspSocketHookRequest(this, (Module*)Utils->Creator, Hook).Send(); +} + +/** When a listening socket gives us a new file descriptor, + * we must associate it with a socket without creating a new + * connection. This constructor is used for this purpose. + */ +TreeSocket::TreeSocket(SpanningTreeUtilities* Util, InspIRCd* SI, int newfd, char* ip, Module* HookMod) + : InspSocket(SI, newfd, ip), Utils(Util), Hook(HookMod) +{ + this->LinkState = WAIT_AUTH_1; + theirchallenge.clear(); + ourchallenge.clear(); + sentcapab = false; + /* If we have a transport module hooked to the parent, hook the same module to this + * socket, and set a timer waiting for handshake before we send CAPAB etc. + */ + if (Hook) + InspSocketHookRequest(this, (Module*)Utils->Creator, Hook).Send(); + + Instance->Timers->AddTimer(new HandshakeTimer(Instance, this, &(Utils->LinkBlocks[0]), this->Utils, 1)); +} + +ServerState TreeSocket::GetLinkState() +{ + return this->LinkState; +} + +Module* TreeSocket::GetHook() +{ + return this->Hook; +} + +TreeSocket::~TreeSocket() +{ + if (Hook) + InspSocketUnhookRequest(this, (Module*)Utils->Creator, Hook).Send(); + + Utils->DelBurstingServer(this); +} + +const std::string& TreeSocket::GetOurChallenge() +{ + return this->ourchallenge; +} + +void TreeSocket::SetOurChallenge(const std::string &c) +{ + this->ourchallenge = c; +} + +const std::string& TreeSocket::GetTheirChallenge() +{ + return this->theirchallenge; +} + +void TreeSocket::SetTheirChallenge(const std::string &c) +{ + this->theirchallenge = c; +} + +std::string TreeSocket::MakePass(const std::string &password, const std::string &challenge) +{ + /* This is a simple (maybe a bit hacky?) HMAC algorithm, thanks to jilles for + * suggesting the use of HMAC to secure the password against various attacks. + * + * Note: If m_sha256.so is not loaded, we MUST fall back to plaintext with no + * HMAC challenge/response. + */ + Module* sha256 = Instance->FindModule("m_sha256.so"); + if (Utils->ChallengeResponse && sha256 && !challenge.empty()) + { + /* XXX: This is how HMAC is supposed to be done: + * + * sha256( (pass xor 0x5c) + sha256((pass xor 0x36) + m) ) + * + * Note that we are encoding the hex hash, not the binary + * output of the hash which is slightly different to standard. + * + * Don't ask me why its always 0x5c and 0x36... it just is. + */ + std::string hmac1, hmac2; + + for (size_t n = 0; n < password.length(); n++) + { + hmac1 += static_cast<char>(password[n] ^ 0x5C); + hmac2 += static_cast<char>(password[n] ^ 0x36); + } + + hmac2 += challenge; + HashResetRequest(Utils->Creator, sha256).Send(); + hmac2 = HashSumRequest(Utils->Creator, sha256, hmac2).Send(); + + HashResetRequest(Utils->Creator, sha256).Send(); + std::string hmac = hmac1 + hmac2; + hmac = HashSumRequest(Utils->Creator, sha256, hmac).Send(); + + return "HMAC-SHA256:"+ hmac; + } + else if (!challenge.empty() && !sha256) + Instance->Log(DEFAULT,"Not authenticating to server using SHA256/HMAC because we don't have m_sha256 loaded!"); + + return password; +} + +/** When an outbound connection finishes connecting, we receive + * this event, and must send our SERVER string to the other + * side. If the other side is happy, as outlined in the server + * to server docs on the inspircd.org site, the other side + * will then send back its own server string. + */ +bool TreeSocket::OnConnected() +{ + if (this->LinkState == CONNECTING) + { + /* we do not need to change state here. */ + for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++) + { + if (x->Name == this->myhost) + { + this->Instance->SNO->WriteToSnoMask('l',"Connection to \2"+myhost+"\2["+(x->HiddenFromStats ? "<hidden>" : this->GetIP())+"] started."); + if (Hook) + { + InspSocketHookRequest(this, (Module*)Utils->Creator, Hook).Send(); + this->Instance->SNO->WriteToSnoMask('l',"Connection to \2"+myhost+"\2["+(x->HiddenFromStats ? "<hidden>" : this->GetIP())+"] using transport \2"+x->Hook+"\2"); + } + this->OutboundPass = x->SendPass; + sentcapab = false; + + /* found who we're supposed to be connecting to, send the neccessary gubbins. */ + if (this->GetHook()) + Instance->Timers->AddTimer(new HandshakeTimer(Instance, this, &(*x), this->Utils, 1)); + else + this->SendCapabilities(); + + return true; + } + } + } + /* There is a (remote) chance that between the /CONNECT and the connection + * being accepted, some muppet has removed the <link> block and rehashed. + * If that happens the connection hangs here until it's closed. Unlikely + * and rather harmless. + */ + this->Instance->SNO->WriteToSnoMask('l',"Connection to \2"+myhost+"\2 lost link tag(!)"); + return true; +} + +void TreeSocket::OnError(InspSocketError e) +{ + Link* MyLink; + + switch (e) + { + case I_ERR_CONNECT: + this->Instance->SNO->WriteToSnoMask('l',"Connection failed: Connection to \002"+myhost+"\002 refused"); + MyLink = Utils->FindLink(myhost); + if (MyLink) + Utils->DoFailOver(MyLink); + break; + case I_ERR_SOCKET: + this->Instance->SNO->WriteToSnoMask('l',"Connection failed: Could not create socket"); + break; + case I_ERR_BIND: + this->Instance->SNO->WriteToSnoMask('l',"Connection failed: Error binding socket to address or port"); + break; + case I_ERR_WRITE: + this->Instance->SNO->WriteToSnoMask('l',"Connection failed: I/O error on connection"); + break; + case I_ERR_NOMOREFDS: + this->Instance->SNO->WriteToSnoMask('l',"Connection failed: Operating system is out of file descriptors!"); + break; + default: + if ((errno) && (errno != EINPROGRESS) && (errno != EAGAIN)) + { + std::string errstr = strerror(errno); + this->Instance->SNO->WriteToSnoMask('l',"Connection to \002"+myhost+"\002 failed with OS error: " + errstr); + } + break; + } +} + +int TreeSocket::OnDisconnect() +{ + /* For the same reason as above, we don't + * handle OnDisconnect() + */ + return true; +} + +/** Recursively send the server tree with distances as hops. + * This is used during network burst to inform the other server + * (and any of ITS servers too) of what servers we know about. + * If at any point any of these servers already exist on the other + * end, our connection may be terminated. The hopcounts given + * by this function are relative, this doesn't matter so long as + * they are all >1, as all the remote servers re-calculate them + * to be relative too, with themselves as hop 0. + */ +void TreeSocket::SendServers(TreeServer* Current, TreeServer* s, int hops) +{ + char command[1024]; + for (unsigned int q = 0; q < Current->ChildCount(); q++) + { + TreeServer* recursive_server = Current->GetChild(q); + if (recursive_server != s) + { + snprintf(command,1024,":%s SERVER %s * %d :%s",Current->GetName().c_str(),recursive_server->GetName().c_str(),hops,recursive_server->GetDesc().c_str()); + this->WriteLine(command); + this->WriteLine(":"+recursive_server->GetName()+" VERSION :"+recursive_server->GetVersion()); + /* down to next level */ + this->SendServers(recursive_server, s, hops+1); + } + } +} + +std::string TreeSocket::MyCapabilities() +{ + std::vector<std::string> modlist; + std::string capabilities; + for (int i = 0; i <= this->Instance->GetModuleCount(); i++) + { + if (this->Instance->modules[i]->GetVersion().Flags & VF_COMMON) + modlist.push_back(this->Instance->Config->module_names[i]); + } + sort(modlist.begin(),modlist.end()); + for (unsigned int i = 0; i < modlist.size(); i++) + { + if (i) + capabilities = capabilities + ","; + capabilities = capabilities + modlist[i]; + } + return capabilities; +} + +std::string TreeSocket::RandString(unsigned int length) +{ + char* randombuf = new char[length+1]; + std::string out; +#ifdef WINDOWS + int fd = -1; +#else + int fd = open("/dev/urandom", O_RDONLY, 0); +#endif + + if (fd >= 0) + { +#ifndef WINDOWS + read(fd, randombuf, length); + close(fd); +#endif + } + else + { + for (unsigned int i = 0; i < length; i++) + randombuf[i] = rand(); + } + + for (unsigned int i = 0; i < length; i++) + { + char randchar = static_cast<char>((randombuf[i] & 0x7F) | 0x21); + out += (randchar == '=' ? '_' : randchar); + } + + delete[] randombuf; + return out; +} + +void TreeSocket::SendCapabilities() +{ + if (sentcapab) + return; + + sentcapab = true; + irc::commasepstream modulelist(MyCapabilities()); + this->WriteLine("CAPAB START"); + + /* Send module names, split at 509 length */ + std::string item = "*"; + std::string line = "CAPAB MODULES "; + while ((item = modulelist.GetToken()) != "") + { + if (line.length() + item.length() + 1 > 509) + { + this->WriteLine(line); + line = "CAPAB MODULES "; + } + + if (line != "CAPAB MODULES ") + line.append(","); + + line.append(item); + } + if (line != "CAPAB MODULES ") + this->WriteLine(line); + + int ip6 = 0; + int ip6support = 0; +#ifdef IPV6 + ip6 = 1; +#endif +#ifdef SUPPORT_IP6LINKS + ip6support = 1; +#endif + std::string extra; + /* Do we have sha256 available? If so, we send a challenge */ + if (Utils->ChallengeResponse && (Instance->FindModule("m_sha256.so"))) + { + this->SetOurChallenge(RandString(20)); + extra = " CHALLENGE=" + this->GetOurChallenge(); + } + + this->WriteLine("CAPAB CAPABILITIES :NICKMAX="+ConvToStr(NICKMAX)+" HALFOP="+ConvToStr(this->Instance->Config->AllowHalfop)+" CHANMAX="+ConvToStr(CHANMAX)+" MAXMODES="+ConvToStr(MAXMODES)+" IDENTMAX="+ConvToStr(IDENTMAX)+" MAXQUIT="+ConvToStr(MAXQUIT)+" MAXTOPIC="+ConvToStr(MAXTOPIC)+" MAXKICK="+ConvToStr(MAXKICK)+" MAXGECOS="+ConvToStr(MAXGECOS)+" MAXAWAY="+ConvToStr(MAXAWAY)+" IP6NATIVE="+ConvToStr(ip6)+" IP6SUPPORT="+ConvToStr(ip6support)+" PROTOCOL="+ConvToStr(ProtocolVersion)+extra+" PREFIX="+Instance->Modes->BuildPrefixes()+" CHANMODES="+Instance->Modes->ChanModes()); + + this->WriteLine("CAPAB END"); +} + +/* Check a comma seperated list for an item */ +bool TreeSocket::HasItem(const std::string &list, const std::string &item) +{ + irc::commasepstream seplist(list); + std::string item2 = "*"; + while ((item2 = seplist.GetToken()) != "") + { + if (item2 == item) + return true; + } + return false; +} + +/* Isolate and return the elements that are different between two comma seperated lists */ +std::string TreeSocket::ListDifference(const std::string &one, const std::string &two) +{ + irc::commasepstream list_one(one); + std::string item = "*"; + std::string result; + while ((item = list_one.GetToken()) != "") + { + if (!HasItem(two, item)) + { + result.append(" "); + result.append(item); + } + } + return result; +} + +void TreeSocket::SendError(const std::string &errormessage) +{ + /* Display the error locally as well as sending it remotely */ + this->WriteLine("ERROR :"+errormessage); + this->Instance->SNO->WriteToSnoMask('l',"Sent \2ERROR\2 to "+this->InboundServerName+": "+errormessage); + /* One last attempt to make sure the error reaches its target */ + this->FlushWriteBuffer(); +} + +bool TreeSocket::Capab(const std::deque<std::string> ¶ms) +{ + if (params.size() < 1) + { + this->SendError("Invalid number of parameters for CAPAB - Mismatched version"); + return false; + } + if (params[0] == "START") + { + this->ModuleList.clear(); + this->CapKeys.clear(); + } + else if (params[0] == "END") + { + std::string reason; + int ip6support = 0; +#ifdef SUPPORT_IP6LINKS + ip6support = 1; +#endif + /* Compare ModuleList and check CapKeys... + * Maybe this could be tidier? -- Brain + */ + if ((this->ModuleList != this->MyCapabilities()) && (this->ModuleList.length())) + { + std::string diff = ListDifference(this->ModuleList, this->MyCapabilities()); + if (!diff.length()) + { + diff = "your server:" + ListDifference(this->MyCapabilities(), this->ModuleList); + } + else + { + diff = "this server:" + diff; + } + if (diff.length() == 12) + reason = "Module list in CAPAB is not alphabetically ordered, cannot compare lists."; + else + reason = "Modules loaded on these servers are not correctly matched, these modules are not loaded on " + diff; + } + + cap_validation valid_capab[] = { + {"Maximum nickname lengths differ or remote nickname length not specified", "NICKMAX", NICKMAX}, + {"Maximum ident lengths differ or remote ident length not specified", "IDENTMAX", IDENTMAX}, + {"Maximum channel lengths differ or remote channel length not specified", "CHANMAX", CHANMAX}, + {"Maximum modes per line differ or remote modes per line not specified", "MAXMODES", MAXMODES}, + {"Maximum quit lengths differ or remote quit length not specified", "MAXQUIT", MAXQUIT}, + {"Maximum topic lengths differ or remote topic length not specified", "MAXTOPIC", MAXTOPIC}, + {"Maximum kick lengths differ or remote kick length not specified", "MAXKICK", MAXKICK}, + {"Maximum GECOS (fullname) lengths differ or remote GECOS length not specified", "MAXGECOS", MAXGECOS}, + {"Maximum awaymessage lengths differ or remote awaymessage length not specified", "MAXAWAY", MAXAWAY}, + {"", "", 0} + }; + + if (((this->CapKeys.find("IP6SUPPORT") == this->CapKeys.end()) && (ip6support)) || ((this->CapKeys.find("IP6SUPPORT") != this->CapKeys.end()) && (this->CapKeys.find("IP6SUPPORT")->second != ConvToStr(ip6support)))) + reason = "We don't both support linking to IPV6 servers"; + if (((this->CapKeys.find("IP6NATIVE") != this->CapKeys.end()) && (this->CapKeys.find("IP6NATIVE")->second == "1")) && (!ip6support)) + reason = "The remote server is IPV6 native, and we don't support linking to IPV6 servers"; + if (((this->CapKeys.find("PROTOCOL") == this->CapKeys.end()) || ((this->CapKeys.find("PROTOCOL") != this->CapKeys.end()) && (this->CapKeys.find("PROTOCOL")->second != ConvToStr(ProtocolVersion))))) + { + if (this->CapKeys.find("PROTOCOL") != this->CapKeys.end()) + reason = "Mismatched protocol versions "+this->CapKeys.find("PROTOCOL")->second+" and "+ConvToStr(ProtocolVersion); + else + reason = "Protocol version not specified"; + } + + if(this->CapKeys.find("PREFIX") != this->CapKeys.end() && this->CapKeys.find("PREFIX")->second != this->Instance->Modes->BuildPrefixes()) + reason = "One or more of the prefixes on the remote server are invalid on this server."; + + if (((this->CapKeys.find("HALFOP") == this->CapKeys.end()) && (Instance->Config->AllowHalfop)) || ((this->CapKeys.find("HALFOP") != this->CapKeys.end()) && (this->CapKeys.find("HALFOP")->second != ConvToStr(Instance->Config->AllowHalfop)))) + reason = "We don't both have halfop support enabled/disabled identically"; + + for (int x = 0; valid_capab[x].size; ++x) + { + if (((this->CapKeys.find(valid_capab[x].key) == this->CapKeys.end()) || ((this->CapKeys.find(valid_capab[x].key) != this->CapKeys.end()) && + (this->CapKeys.find(valid_capab[x].key)->second != ConvToStr(valid_capab[x].size))))) + reason = valid_capab[x].reason; + } + + /* Challenge response, store their challenge for our password */ + std::map<std::string,std::string>::iterator n = this->CapKeys.find("CHALLENGE"); + if (Utils->ChallengeResponse && (n != this->CapKeys.end()) && (Instance->FindModule("m_sha256.so"))) + { + /* Challenge-response is on now */ + this->SetTheirChallenge(n->second); + if (!this->GetTheirChallenge().empty() && (this->LinkState == CONNECTING)) + { + this->WriteLine(std::string("SERVER ")+this->Instance->Config->ServerName+" "+this->MakePass(OutboundPass, this->GetTheirChallenge())+" 0 :"+this->Instance->Config->ServerDesc); + } + } + else + { + /* They didnt specify a challenge or we don't have m_sha256.so, we use plaintext */ + if (this->LinkState == CONNECTING) + this->WriteLine(std::string("SERVER ")+this->Instance->Config->ServerName+" "+OutboundPass+" 0 :"+this->Instance->Config->ServerDesc); + } + + if (reason.length()) + { + this->SendError("CAPAB negotiation failed: "+reason); + return false; + } + } + else if ((params[0] == "MODULES") && (params.size() == 2)) + { + if (!this->ModuleList.length()) + { + this->ModuleList.append(params[1]); + } + else + { + this->ModuleList.append(","); + this->ModuleList.append(params[1]); + } + } + + else if ((params[0] == "CAPABILITIES") && (params.size() == 2)) + { + irc::tokenstream capabs(params[1]); + std::string item; + bool more = true; + while ((more = capabs.GetToken(item))) + { + /* Process each key/value pair */ + std::string::size_type equals = item.rfind('='); + if (equals != std::string::npos) + { + std::string var = item.substr(0, equals); + std::string value = item.substr(equals+1, item.length()); + CapKeys[var] = value; + } + } + } + return true; +} + +/** This function forces this server to quit, removing this server + * and any users on it (and servers and users below that, etc etc). + * It's very slow and pretty clunky, but luckily unless your network + * is having a REAL bad hair day, this function shouldnt be called + * too many times a month ;-) + */ +void TreeSocket::SquitServer(std::string &from, TreeServer* Current) +{ + /* recursively squit the servers attached to 'Current'. + * We're going backwards so we don't remove users + * while we still need them ;) + */ + for (unsigned int q = 0; q < Current->ChildCount(); q++) + { + TreeServer* recursive_server = Current->GetChild(q); + this->SquitServer(from,recursive_server); + } + /* Now we've whacked the kids, whack self */ + num_lost_servers++; + num_lost_users += Current->QuitUsers(from); +} + +/** This is a wrapper function for SquitServer above, which + * does some validation first and passes on the SQUIT to all + * other remaining servers. + */ +void TreeSocket::Squit(TreeServer* Current, const std::string &reason) +{ + if ((Current) && (Current != Utils->TreeRoot)) + { + Event rmode((char*)Current->GetName().c_str(), (Module*)Utils->Creator, "lost_server"); + rmode.Send(Instance); + + std::deque<std::string> params; + params.push_back(Current->GetName()); + params.push_back(":"+reason); + Utils->DoOneToAllButSender(Current->GetParent()->GetName(),"SQUIT",params,Current->GetName()); + if (Current->GetParent() == Utils->TreeRoot) + { + this->Instance->SNO->WriteToSnoMask('l',"Server \002"+Current->GetName()+"\002 split: "+reason); + } + else + { + this->Instance->SNO->WriteToSnoMask('l',"Server \002"+Current->GetName()+"\002 split from server \002"+Current->GetParent()->GetName()+"\002 with reason: "+reason); + } + num_lost_servers = 0; + num_lost_users = 0; + std::string from = Current->GetParent()->GetName()+" "+Current->GetName(); + SquitServer(from, Current); + Current->Tidy(); + Current->GetParent()->DelChild(Current); + DELETE(Current); + this->Instance->SNO->WriteToSnoMask('l',"Netsplit complete, lost \002%d\002 users on \002%d\002 servers.", num_lost_users, num_lost_servers); + } + else + Instance->Log(DEFAULT,"Squit from unknown server"); +} + +/** FMODE command - server mode with timestamp checks */ +bool TreeSocket::ForceMode(const std::string &source, std::deque<std::string> ¶ms) +{ + /* Chances are this is a 1.0 FMODE without TS */ + if (params.size() < 3) + { + /* No modes were in the command, probably a channel with no modes set on it */ + return true; + } + + bool smode = false; + std::string sourceserv; + /* Are we dealing with an FMODE from a user, or from a server? */ + userrec* who = this->Instance->FindNick(source); + if (who) + { + /* FMODE from a user, set sourceserv to the users server name */ + sourceserv = who->server; + } + else + { + /* FMODE from a server, create a fake user to receive mode feedback */ + who = new userrec(this->Instance); + who->SetFd(FD_MAGIC_NUMBER); + smode = true; /* Setting this flag tells us we should free the userrec later */ + sourceserv = source; /* Set sourceserv to the actual source string */ + } + const char* modelist[64]; + time_t TS = 0; + int n = 0; + memset(&modelist,0,sizeof(modelist)); + for (unsigned int q = 0; (q < params.size()) && (q < 64); q++) + { + if (q == 1) + { + /* The timestamp is in this position. + * We don't want to pass that up to the + * server->client protocol! + */ + TS = atoi(params[q].c_str()); + } + else + { + /* Everything else is fine to append to the modelist */ + modelist[n++] = params[q].c_str(); + } + + } + /* Extract the TS value of the object, either userrec or chanrec */ + userrec* dst = this->Instance->FindNick(params[0]); + chanrec* chan = NULL; + time_t ourTS = 0; + if (dst) + { + ourTS = dst->age; + } + else + { + chan = this->Instance->FindChan(params[0]); + if (chan) + { + ourTS = chan->age; + } + else + /* Oops, channel doesnt exist! */ + return true; + } + + if (!TS) + { + Instance->Log(DEFAULT,"*** BUG? *** TS of 0 sent to FMODE. Are some services authors smoking craq, or is it 1970 again?. Dropped."); + Instance->SNO->WriteToSnoMask('d', "WARNING: The server %s is sending FMODE with a TS of zero. Total craq. Mode was dropped.", sourceserv.c_str()); + return true; + } + + /* TS is equal or less: Merge the mode changes into ours and pass on. + */ + if (TS <= ourTS) + { + if ((TS < ourTS) && (!dst)) + Instance->Log(DEFAULT,"*** BUG *** Channel TS sent in FMODE to %s is %lu which is not equal to %lu!", params[0].c_str(), TS, ourTS); + + if (smode) + { + this->Instance->SendMode(modelist, n, who); + } + else + { + this->Instance->CallCommandHandler("MODE", modelist, n, who); + } + /* HOT POTATO! PASS IT ON! */ + Utils->DoOneToAllButSender(source,"FMODE",params,sourceserv); + } + /* If the TS is greater than ours, we drop the mode and dont pass it anywhere. + */ + + if (smode) + DELETE(who); + + return true; +} + +/** FTOPIC command */ +bool TreeSocket::ForceTopic(const std::string &source, std::deque<std::string> ¶ms) +{ + if (params.size() != 4) + return true; + time_t ts = atoi(params[1].c_str()); + std::string nsource = source; + chanrec* c = this->Instance->FindChan(params[0]); + if (c) + { + if ((ts >= c->topicset) || (!*c->topic)) + { + std::string oldtopic = c->topic; + strlcpy(c->topic,params[3].c_str(),MAXTOPIC); + strlcpy(c->setby,params[2].c_str(),127); + c->topicset = ts; + /* if the topic text is the same as the current topic, + * dont bother to send the TOPIC command out, just silently + * update the set time and set nick. + */ + if (oldtopic != params[3]) + { + userrec* user = this->Instance->FindNick(source); + if (!user) + { + c->WriteChannelWithServ(Instance->Config->ServerName, "TOPIC %s :%s", c->name, c->topic); + } + else + { + c->WriteChannel(user, "TOPIC %s :%s", c->name, c->topic); + nsource = user->server; + } + /* all done, send it on its way */ + params[3] = ":" + params[3]; + Utils->DoOneToAllButSender(source,"FTOPIC",params,nsource); + } + } + + } + return true; +} + +/** FJOIN, similar to TS6 SJOIN, but not quite. */ +bool TreeSocket::ForceJoin(const std::string &source, std::deque<std::string> ¶ms) +{ + /* 1.1 FJOIN works as follows: + * + * Each FJOIN is sent along with a timestamp, and the side with the lowest + * timestamp 'wins'. From this point on we will refer to this side as the + * winner. The side with the higher timestamp loses, from this point on we + * will call this side the loser or losing side. This should be familiar to + * anyone who's dealt with dreamforge or TS6 before. + * + * When two sides of a split heal and this occurs, the following things + * will happen: + * + * If the timestamps are exactly equal, both sides merge their privilages + * and users, as in InspIRCd 1.0 and ircd2.8. The channels have not been + * re-created during a split, this is safe to do. + * + * If the timestamps are NOT equal, the losing side removes all of its + * modes from the channel, before introducing new users into the channel + * which are listed in the FJOIN command's parameters. The losing side then + * LOWERS its timestamp value of the channel to match that of the winning + * side, and the modes of the users of the winning side are merged in with + * the losing side. + * + * The winning side on the other hand will ignore all user modes from the + * losing side, so only its own modes get applied. Life is simple for those + * who succeed at internets. :-) + * + * NOTE: Unlike TS6 and dreamforge and other protocols which have SJOIN, + * FJOIN does not contain the simple-modes such as +iklmnsp. Why not, + * you ask? Well, quite simply because we don't need to. They'll be sent + * after the FJOIN by FMODE, and FMODE is timestamped, so in the event + * the losing side sends any modes for the channel which shouldnt win, + * they wont as their timestamp will be too high :-) + */ + + if (params.size() < 3) + return true; + + irc::modestacker modestack(true); /* Modes to apply from the users in the user list */ + userrec* who = NULL; /* User we are currently checking */ + std::string channel = params[0]; /* Channel name, as a string */ + time_t TS = atoi(params[1].c_str()); /* Timestamp given to us for remote side */ + irc::tokenstream users(params[2]); /* Users from the user list */ + bool apply_other_sides_modes = true; /* True if we are accepting the other side's modes */ + chanrec* chan = this->Instance->FindChan(channel); /* The channel we're sending joins to */ + time_t ourTS = chan ? chan->age : Instance->Time(true)+600; /* The TS of our side of the link */ + bool created = !chan; /* True if the channel doesnt exist here yet */ + std::string item; /* One item in the list of nicks */ + + params[2] = ":" + params[2]; + Utils->DoOneToAllButSender(source,"FJOIN",params,source); + + if (!TS) + { + Instance->Log(DEFAULT,"*** BUG? *** TS of 0 sent to FJOIN. Are some services authors smoking craq, or is it 1970 again?. Dropped."); + Instance->SNO->WriteToSnoMask('d', "WARNING: The server %s is sending FJOIN with a TS of zero. Total craq. Command was dropped.", source.c_str()); + return true; + } + + /* If our TS is less than theirs, we dont accept their modes */ + if (ourTS < TS) + apply_other_sides_modes = false; + + /* Our TS greater than theirs, clear all our modes from the channel, accept theirs. */ + if (ourTS > TS) + { + std::deque<std::string> param_list; + if (Utils->AnnounceTSChange && chan) + chan->WriteChannelWithServ(Instance->Config->ServerName, "NOTICE %s :TS for %s changed from %lu to %lu", chan->name, chan->name, ourTS, TS); + ourTS = TS; + if (!created) + { + chan->age = TS; + param_list.push_back(channel); + this->RemoveStatus(Instance->Config->ServerName, param_list); + } + } + + /* Now, process every 'prefixes,nick' pair */ + while (users.GetToken(item)) + { + const char* usr = item.c_str(); + if (usr && *usr) + { + const char* permissions = usr; + /* Iterate through all the prefix values, convert them from prefixes to mode letters */ + std::string modes; + while ((*permissions) && (*permissions != ',')) + { + ModeHandler* mh = Instance->Modes->FindPrefix(*permissions); + if (mh) + modes = modes + mh->GetModeChar(); + else + { + this->SendError(std::string("Invalid prefix '")+(*permissions)+"' in FJOIN"); + return false; + } + usr++; + permissions++; + } + /* Advance past the comma, to the nick */ + usr++; + + /* Check the user actually exists */ + who = this->Instance->FindNick(usr); + if (who) + { + /* Check that the user's 'direction' is correct */ + TreeServer* route_back_again = Utils->BestRouteTo(who->server); + if ((!route_back_again) || (route_back_again->GetSocket() != this)) + continue; + + /* Add any permissions this user had to the mode stack */ + for (std::string::iterator x = modes.begin(); x != modes.end(); ++x) + modestack.Push(*x, who->nick); + + chanrec::JoinUser(this->Instance, who, channel.c_str(), true, "", TS); + } + else + { + Instance->Log(SPARSE,"Warning! Invalid user %s in FJOIN to channel %s IGNORED", usr, channel.c_str()); + continue; + } + } + } + + /* Flush mode stacker if we lost the FJOIN or had equal TS */ + if (apply_other_sides_modes) + { + std::deque<std::string> stackresult; + const char* mode_junk[MAXMODES+2]; + userrec* n = new userrec(Instance); + n->SetFd(FD_MAGIC_NUMBER); + mode_junk[0] = channel.c_str(); + + while (modestack.GetStackedLine(stackresult)) + { + for (size_t j = 0; j < stackresult.size(); j++) + { + mode_junk[j+1] = stackresult[j].c_str(); + } + Instance->SendMode(mode_junk, stackresult.size() + 1, n); + } + + delete n; + } + + return true; +} + +/** NICK command */ +bool TreeSocket::IntroduceClient(const std::string &source, std::deque<std::string> ¶ms) +{ + /** Do we have enough parameters: + * NICK age nick host dhost ident +modes ip :gecos + */ + if (params.size() != 8) + { + this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" KILL "+params[1]+" :Invalid client introduction ("+params[1]+"?)"); + return true; + } + + time_t age = ConvToInt(params[0]); + const char* tempnick = params[1].c_str(); + + cmd_validation valid[] = { {"Nickname", 1, NICKMAX}, {"Hostname", 2, 64}, {"Displayed hostname", 3, 64}, {"Ident", 4, IDENTMAX}, {"GECOS", 7, MAXGECOS}, {"", 0, 0} }; + + TreeServer* remoteserver = Utils->FindServer(source); + if (!remoteserver) + { + this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" KILL "+params[1]+" :Invalid client introduction (Unknown server "+source+")"); + return true; + } + + /* Check parameters for validity before introducing the client, discovered by dmb */ + if (!age) + { + this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" KILL "+params[1]+" :Invalid client introduction (Invalid TS?)"); + return true; + } + for (size_t x = 0; valid[x].length; ++x) + { + if (params[valid[x].param].length() > valid[x].length) + { + this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" KILL "+params[1]+" :Invalid client introduction (" + valid[x].item + " > " + ConvToStr(valid[x].length) + ")"); + return true; + } + } + + /** Our client looks ok, lets introduce it now + */ + Instance->Log(DEBUG,"New remote client %s",tempnick); + user_hash::iterator iter = this->Instance->clientlist->find(tempnick); + + if (iter != this->Instance->clientlist->end()) + { + /* nick collision */ + this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" KILL "+tempnick+" :Nickname collision"); + userrec::QuitUser(this->Instance, iter->second, "Nickname collision"); + return true; + } + + userrec* _new = new userrec(this->Instance); + (*(this->Instance->clientlist))[tempnick] = _new; + _new->SetFd(FD_MAGIC_NUMBER); + strlcpy(_new->nick, tempnick,NICKMAX-1); + strlcpy(_new->host, params[2].c_str(),64); + strlcpy(_new->dhost, params[3].c_str(),64); + _new->server = this->Instance->FindServerNamePtr(source.c_str()); + strlcpy(_new->ident, params[4].c_str(),IDENTMAX); + strlcpy(_new->fullname, params[7].c_str(),MAXGECOS); + _new->registered = REG_ALL; + _new->signon = age; + + /* we need to remove the + from the modestring, so we can do our stuff */ + std::string::size_type pos_after_plus = params[5].find_first_not_of('+'); + if (pos_after_plus != std::string::npos) + params[5] = params[5].substr(pos_after_plus); + + for (std::string::iterator v = params[5].begin(); v != params[5].end(); v++) + { + _new->modes[(*v)-65] = 1; + /* For each mode thats set, increase counter */ + ModeHandler* mh = Instance->Modes->FindMode(*v, MODETYPE_USER); + if (mh) + mh->ChangeCount(1); + } + + /* now we've done with modes processing, put the + back for remote servers */ + params[5] = "+" + params[5]; + +#ifdef SUPPORT_IP6LINKS + if (params[6].find_first_of(":") != std::string::npos) + _new->SetSockAddr(AF_INET6, params[6].c_str(), 0); + else +#endif + _new->SetSockAddr(AF_INET, params[6].c_str(), 0); + + Instance->AddGlobalClone(_new); + + bool dosend = !(((this->Utils->quiet_bursts) && (this->bursting || Utils->FindRemoteBurstServer(remoteserver))) || (this->Instance->SilentULine(_new->server))); + + if (dosend) + this->Instance->SNO->WriteToSnoMask('C',"Client connecting at %s: %s!%s@%s [%s] [%s]",_new->server,_new->nick,_new->ident,_new->host, _new->GetIPString(), _new->fullname); + + params[7] = ":" + params[7]; + Utils->DoOneToAllButSender(source,"NICK", params, source); + + // Increment the Source Servers User Count.. + TreeServer* SourceServer = Utils->FindServer(source); + if (SourceServer) + { + SourceServer->AddUserCount(); + } + + FOREACH_MOD_I(Instance,I_OnPostConnect,OnPostConnect(_new)); + + return true; +} + +/** Send one or more FJOINs for a channel of users. + * If the length of a single line is more than 480-NICKMAX + * in length, it is split over multiple lines. + */ +void TreeSocket::SendFJoins(TreeServer* Current, chanrec* c) +{ + std::string buffer; + char list[MAXBUF]; + std::string individual_halfops = std::string(":")+this->Instance->Config->ServerName+" FMODE "+c->name+" "+ConvToStr(c->age); + + size_t dlen, curlen; + dlen = curlen = snprintf(list,MAXBUF,":%s FJOIN %s %lu",this->Instance->Config->ServerName,c->name,(unsigned long)c->age); + int numusers = 0; + char* ptr = list + dlen; + + CUList *ulist = c->GetUsers(); + std::string modes; + std::string params; + + for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++) + { + // The first parameter gets a : before it + size_t ptrlen = snprintf(ptr, MAXBUF, " %s%s,%s", !numusers ? ":" : "", c->GetAllPrefixChars(i->first), i->first->nick); + + curlen += ptrlen; + ptr += ptrlen; + + numusers++; + + if (curlen > (480-NICKMAX)) + { + buffer.append(list).append("\r\n"); + dlen = curlen = snprintf(list,MAXBUF,":%s FJOIN %s %lu",this->Instance->Config->ServerName,c->name,(unsigned long)c->age); + ptr = list + dlen; + ptrlen = 0; + numusers = 0; + } + } + + if (numusers) + buffer.append(list).append("\r\n"); + + buffer.append(":").append(this->Instance->Config->ServerName).append(" FMODE ").append(c->name).append(" ").append(ConvToStr(c->age)).append(" +").append(c->ChanModes(true)).append("\r\n"); + + int linesize = 1; + for (BanList::iterator b = c->bans.begin(); b != c->bans.end(); b++) + { + int size = strlen(b->data) + 2; + int currsize = linesize + size; + if (currsize <= 350) + { + modes.append("b"); + params.append(" ").append(b->data); + linesize += size; + } + if ((params.length() >= MAXMODES) || (currsize > 350)) + { + /* Wrap at MAXMODES */ + buffer.append(":").append(this->Instance->Config->ServerName).append(" FMODE ").append(c->name).append(" ").append(ConvToStr(c->age)).append(" +").append(modes).append(params).append("\r\n"); + modes.clear(); + params.clear(); + linesize = 1; + } + } + + /* Only send these if there are any */ + if (!modes.empty()) + buffer.append(":").append(this->Instance->Config->ServerName).append(" FMODE ").append(c->name).append(" ").append(ConvToStr(c->age)).append(" +").append(modes).append(params); + + this->WriteLine(buffer); +} + +/** Send G, Q, Z and E lines */ +void TreeSocket::SendXLines(TreeServer* Current) +{ + char data[MAXBUF]; + std::string buffer; + std::string n = this->Instance->Config->ServerName; + const char* sn = n.c_str(); + /* Yes, these arent too nice looking, but they get the job done */ + for (std::vector<ZLine*>::iterator i = Instance->XLines->zlines.begin(); i != Instance->XLines->zlines.end(); i++) + { + snprintf(data,MAXBUF,":%s ADDLINE Z %s %s %lu %lu :%s\r\n",sn,(*i)->ipaddr,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason); + buffer.append(data); + } + for (std::vector<QLine*>::iterator i = Instance->XLines->qlines.begin(); i != Instance->XLines->qlines.end(); i++) + { + snprintf(data,MAXBUF,":%s ADDLINE Q %s %s %lu %lu :%s\r\n",sn,(*i)->nick,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason); + buffer.append(data); + } + for (std::vector<GLine*>::iterator i = Instance->XLines->glines.begin(); i != Instance->XLines->glines.end(); i++) + { + snprintf(data,MAXBUF,":%s ADDLINE G %s@%s %s %lu %lu :%s\r\n",sn,(*i)->identmask,(*i)->hostmask,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason); + buffer.append(data); + } + for (std::vector<ELine*>::iterator i = Instance->XLines->elines.begin(); i != Instance->XLines->elines.end(); i++) + { + snprintf(data,MAXBUF,":%s ADDLINE E %s@%s %s %lu %lu :%s\r\n",sn,(*i)->identmask,(*i)->hostmask,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason); + buffer.append(data); + } + for (std::vector<ZLine*>::iterator i = Instance->XLines->pzlines.begin(); i != Instance->XLines->pzlines.end(); i++) + { + snprintf(data,MAXBUF,":%s ADDLINE Z %s %s %lu %lu :%s\r\n",sn,(*i)->ipaddr,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason); + buffer.append(data); + } + for (std::vector<QLine*>::iterator i = Instance->XLines->pqlines.begin(); i != Instance->XLines->pqlines.end(); i++) + { + snprintf(data,MAXBUF,":%s ADDLINE Q %s %s %lu %lu :%s\r\n",sn,(*i)->nick,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason); + buffer.append(data); + } + for (std::vector<GLine*>::iterator i = Instance->XLines->pglines.begin(); i != Instance->XLines->pglines.end(); i++) + { + snprintf(data,MAXBUF,":%s ADDLINE G %s@%s %s %lu %lu :%s\r\n",sn,(*i)->identmask,(*i)->hostmask,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason); + buffer.append(data); + } + for (std::vector<ELine*>::iterator i = Instance->XLines->pelines.begin(); i != Instance->XLines->pelines.end(); i++) + { + snprintf(data,MAXBUF,":%s ADDLINE E %s@%s %s %lu %lu :%s\r\n",sn,(*i)->identmask,(*i)->hostmask,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason); + buffer.append(data); + } + + if (!buffer.empty()) + this->WriteLine(buffer); +} + +/** Send channel modes and topics */ +void TreeSocket::SendChannelModes(TreeServer* Current) +{ + char data[MAXBUF]; + std::deque<std::string> list; + std::string n = this->Instance->Config->ServerName; + const char* sn = n.c_str(); + Instance->Log(DEBUG,"Sending channels and modes, %d to send", this->Instance->chanlist->size()); + for (chan_hash::iterator c = this->Instance->chanlist->begin(); c != this->Instance->chanlist->end(); c++) + { + SendFJoins(Current, c->second); + if (*c->second->topic) + { + snprintf(data,MAXBUF,":%s FTOPIC %s %lu %s :%s",sn,c->second->name,(unsigned long)c->second->topicset,c->second->setby,c->second->topic); + this->WriteLine(data); + } + FOREACH_MOD_I(this->Instance,I_OnSyncChannel,OnSyncChannel(c->second,(Module*)Utils->Creator,(void*)this)); + list.clear(); + c->second->GetExtList(list); + for (unsigned int j = 0; j < list.size(); j++) + { + FOREACH_MOD_I(this->Instance,I_OnSyncChannelMetaData,OnSyncChannelMetaData(c->second,(Module*)Utils->Creator,(void*)this,list[j])); + } + } +} + +/** send all users and their oper state/modes */ +void TreeSocket::SendUsers(TreeServer* Current) +{ + char data[MAXBUF]; + std::deque<std::string> list; + std::string dataline; + for (user_hash::iterator u = this->Instance->clientlist->begin(); u != this->Instance->clientlist->end(); u++) + { + if (u->second->registered == REG_ALL) + { + snprintf(data,MAXBUF,":%s NICK %lu %s %s %s %s +%s %s :%s",u->second->server,(unsigned long)u->second->age,u->second->nick,u->second->host,u->second->dhost,u->second->ident,u->second->FormatModes(),u->second->GetIPString(),u->second->fullname); + this->WriteLine(data); + if (*u->second->oper) + { + snprintf(data,MAXBUF,":%s OPERTYPE %s", u->second->nick, u->second->oper); + this->WriteLine(data); + } + if (*u->second->awaymsg) + { + snprintf(data,MAXBUF,":%s AWAY :%s", u->second->nick, u->second->awaymsg); + this->WriteLine(data); + } + } + } + for (user_hash::iterator u = this->Instance->clientlist->begin(); u != this->Instance->clientlist->end(); u++) + { + FOREACH_MOD_I(this->Instance,I_OnSyncUser,OnSyncUser(u->second,(Module*)Utils->Creator,(void*)this)); + list.clear(); + u->second->GetExtList(list); + for (unsigned int j = 0; j < list.size(); j++) + { + FOREACH_MOD_I(this->Instance,I_OnSyncUserMetaData,OnSyncUserMetaData(u->second,(Module*)Utils->Creator,(void*)this,list[j])); + } + } +} + +/** This function is called when we want to send a netburst to a local + * server. There is a set order we must do this, because for example + * users require their servers to exist, and channels require their + * users to exist. You get the idea. + */ +void TreeSocket::DoBurst(TreeServer* s) +{ + std::string name = s->GetName(); + std::string burst = "BURST "+ConvToStr(Instance->Time(true)); + std::string endburst = "ENDBURST"; + this->Instance->SNO->WriteToSnoMask('l',"Bursting to \2%s\2 (Authentication: %s).", name.c_str(), this->GetTheirChallenge().empty() ? "plaintext password" : "SHA256-HMAC challenge-response"); + this->WriteLine(burst); + /* send our version string */ + this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" VERSION :"+this->Instance->GetVersionString()); + /* Send server tree */ + this->SendServers(Utils->TreeRoot,s,1); + /* Send users and their oper status */ + this->SendUsers(s); + /* Send everything else (channel modes, xlines etc) */ + this->SendChannelModes(s); + this->SendXLines(s); + FOREACH_MOD_I(this->Instance,I_OnSyncOtherMetaData,OnSyncOtherMetaData((Module*)Utils->Creator,(void*)this)); + this->WriteLine(endburst); + this->Instance->SNO->WriteToSnoMask('l',"Finished bursting to \2"+name+"\2."); +} + +/** This function is called when we receive data from a remote + * server. We buffer the data in a std::string (it doesnt stay + * there for long), reading using InspSocket::Read() which can + * read up to 16 kilobytes in one operation. + * + * IF THIS FUNCTION RETURNS FALSE, THE CORE CLOSES AND DELETES + * THE SOCKET OBJECT FOR US. + */ +bool TreeSocket::OnDataReady() +{ + char* data = this->Read(); + /* Check that the data read is a valid pointer and it has some content */ + if (data && *data) + { + this->in_buffer.append(data); + /* While there is at least one new line in the buffer, + * do something useful (we hope!) with it. + */ + while (in_buffer.find("\n") != std::string::npos) + { + std::string ret = in_buffer.substr(0,in_buffer.find("\n")-1); + in_buffer = in_buffer.substr(in_buffer.find("\n")+1,in_buffer.length()-in_buffer.find("\n")); + /* Use rfind here not find, as theres more + * chance of the \r being near the end of the + * string, not the start. + */ + if (ret.find("\r") != std::string::npos) + ret = in_buffer.substr(0,in_buffer.find("\r")-1); + /* Process this one, abort if it + * didnt return true. + */ + if (!this->ProcessLine(ret)) + { + return false; + } + } + return true; + } + /* EAGAIN returns an empty but non-NULL string, so this + * evaluates to TRUE for EAGAIN but to FALSE for EOF. + */ + return (data && !*data); +} + |