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/* +------------------------------------+
* | 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 <string>
#include "configreader.h"
#include "socket.h"
#include "socketengine.h"
#include "wildcard.h"
using namespace irc::sockets;
/* Used when comparing CIDR masks for the modulus bits left over.
* A lot of ircd's seem to do this:
* ((-1) << (8 - (mask % 8)))
* But imho, it sucks in comparison to a nice neat lookup table.
*/
const unsigned char inverted_bits[8] = { 0x00, /* 00000000 - 0 bits - never actually used */
0x80, /* 10000000 - 1 bits */
0xC0, /* 11000000 - 2 bits */
0xE0, /* 11100000 - 3 bits */
0xF0, /* 11110000 - 4 bits */
0xF8, /* 11111000 - 5 bits */
0xFC, /* 11111100 - 6 bits */
0xFE /* 11111110 - 7 bits */
};
ListenSocket::ListenSocket(InspIRCd* Instance, int port, char* addr) : ServerInstance(Instance), desc("plaintext"), bind_addr(addr), bind_port(port)
{
this->SetFd(OpenTCPSocket(addr));
if (this->GetFd() > -1)
{
if (!Instance->BindSocket(this->fd,port,addr))
this->fd = -1;
#ifdef IPV6
if ((!*addr) || (strchr(addr,':')))
this->family = AF_INET6;
else
#endif
this->family = AF_INET;
Instance->SE->AddFd(this);
}
}
ListenSocket::~ListenSocket()
{
if (this->GetFd() > -1)
{
ServerInstance->SE->DelFd(this);
ServerInstance->Log(DEBUG,"Shut down listener on fd %d", this->fd);
if (shutdown(this->fd, 2) || close(this->fd))
ServerInstance->Log(DEBUG,"Failed to cancel listener: %s", strerror(errno));
this->fd = -1;
}
}
void ListenSocket::HandleEvent(EventType et, int errornum)
{
sockaddr* sock_us = new sockaddr[2]; // our port number
sockaddr* client = new sockaddr[2];
socklen_t uslen, length; // length of our port number
int incomingSockfd, in_port;
#ifdef IPV6
if (this->family == AF_INET6)
{
uslen = sizeof(sockaddr_in6);
length = sizeof(sockaddr_in6);
}
else
#endif
{
uslen = sizeof(sockaddr_in);
length = sizeof(sockaddr_in);
}
incomingSockfd = _accept (this->GetFd(), (sockaddr*)client, &length);
if ((incomingSockfd > -1) && (!_getsockname(incomingSockfd, sock_us, &uslen)))
{
char buf[MAXBUF];
#ifdef IPV6
if (this->family == AF_INET6)
{
inet_ntop(AF_INET6, &((const sockaddr_in6*)client)->sin6_addr, buf, sizeof(buf));
in_port = ntohs(((sockaddr_in6*)sock_us)->sin6_port);
}
else
#endif
{
inet_ntop(AF_INET, &((const sockaddr_in*)client)->sin_addr, buf, sizeof(buf));
in_port = ntohs(((sockaddr_in*)sock_us)->sin_port);
}
NonBlocking(incomingSockfd);
if (ServerInstance->Config->GetIOHook(in_port))
{
try
{
ServerInstance->Config->GetIOHook(in_port)->OnRawSocketAccept(incomingSockfd, buf, in_port);
}
catch (CoreException& modexcept)
{
ServerInstance->Log(DEBUG,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason());
}
}
ServerInstance->stats->statsAccept++;
userrec::AddClient(ServerInstance, incomingSockfd, in_port, false, this->family, client);
}
else
{
shutdown(incomingSockfd,2);
close(incomingSockfd);
ServerInstance->stats->statsRefused++;
}
delete[] client;
delete[] sock_us;
}
/* Match raw bytes using CIDR bit matching, used by higher level MatchCIDR() */
bool irc::sockets::MatchCIDRBits(unsigned char* address, unsigned char* mask, unsigned int mask_bits)
{
unsigned int modulus = mask_bits % 8; /* Number of whole bytes in the mask */
unsigned int divisor = mask_bits / 8; /* Remaining bits in the mask after whole bytes are dealt with */
/* First compare the whole bytes, if they dont match, return false */
if (memcmp(address, mask, divisor))
return false;
/* Now if there are any remainder bits, we compare them with logic AND */
if (modulus)
if ((address[divisor] & inverted_bits[modulus]) != (mask[divisor] & inverted_bits[modulus]))
/* If they dont match, return false */
return false;
/* The address matches the mask, to mask_bits bits of mask */
return true;
}
/* Match CIDR, but dont attempt to match() against leading *!*@ sections */
bool irc::sockets::MatchCIDR(const char* address, const char* cidr_mask)
{
return MatchCIDR(address, cidr_mask, false);
}
/* Match CIDR strings, e.g. 127.0.0.1 to 127.0.0.0/8 or 3ffe:1:5:6::8 to 3ffe:1::0/32
* If you have a lot of hosts to match, youre probably better off building your mask once
* and then using the lower level MatchCIDRBits directly.
*
* This will also attempt to match any leading usernames or nicknames on the mask, using
* match(), when match_with_username is true.
*/
bool irc::sockets::MatchCIDR(const char* address, const char* cidr_mask, bool match_with_username)
{
unsigned char addr_raw[16];
unsigned char mask_raw[16];
unsigned int bits = 0;
char* mask = NULL;
/* The caller is trying to match ident@<mask>/bits.
* Chop off the ident@ portion, use match() on it
* seperately.
*/
if (match_with_username)
{
/* Duplicate the strings, and try to find the position
* of the @ symbol in each */
char* address_dupe = strdup(address);
char* cidr_dupe = strdup(cidr_mask);
/* Use strchr not strrchr, because its going to be nearer to the left */
char* username_mask_pos = strrchr(cidr_dupe, '@');
char* username_addr_pos = strrchr(address_dupe, '@');
/* Both strings have an @ symbol in them */
if (username_mask_pos && username_addr_pos)
{
/* Zero out the location of the @ symbol */
*username_mask_pos = *username_addr_pos = 0;
/* Try and match() the strings before the @
* symbols, and recursively call MatchCIDR without
* username matching enabled to match the host part.
*/
bool result = (match(address_dupe, cidr_dupe) && MatchCIDR(username_addr_pos + 1, username_mask_pos + 1, false));
/* Free the stuff we created */
free(address_dupe);
free(cidr_dupe);
/* Return a result */
return result;
}
else
{
/* One or both didnt have an @ in,
* just match as CIDR
*/
free(address_dupe);
free(cidr_dupe);
mask = strdup(cidr_mask);
}
}
else
{
/* Make a copy of the cidr mask string,
* we're going to change it
*/
mask = strdup(cidr_mask);
}
in_addr address_in4;
in_addr mask_in4;
/* Use strrchr for this, its nearer to the right */
char* bits_chars = strrchr(mask,'/');
if (bits_chars)
{
bits = atoi(bits_chars + 1);
*bits_chars = 0;
}
else
{
/* No 'number of bits' field! */
free(mask);
return false;
}
#ifdef SUPPORT_IP6LINKS
in6_addr address_in6;
in6_addr mask_in6;
if (inet_pton(AF_INET6, address, &address_in6) > 0)
{
if (inet_pton(AF_INET6, mask, &mask_in6) > 0)
{
memcpy(&addr_raw, &address_in6.s6_addr, 16);
memcpy(&mask_raw, &mask_in6.s6_addr, 16);
if (bits > 128)
bits = 128;
}
else
{
/* The address was valid ipv6, but the mask
* that goes with it wasnt.
*/
free(mask);
return false;
}
}
else
#endif
if (inet_pton(AF_INET, address, &address_in4) > 0)
{
if (inet_pton(AF_INET, mask, &mask_in4) > 0)
{
memcpy(&addr_raw, &address_in4.s_addr, 4);
memcpy(&mask_raw, &mask_in4.s_addr, 4);
if (bits > 32)
bits = 32;
}
else
{
/* The address was valid ipv4,
* but the mask that went with it wasnt.
*/
free(mask);
return false;
}
}
else
{
/* The address was neither ipv4 or ipv6 */
free(mask);
return false;
}
/* Low-level-match the bits in the raw data */
free(mask);
return MatchCIDRBits(addr_raw, mask_raw, bits);
}
void irc::sockets::Blocking(int s)
{
#ifndef WIN32
int flags = fcntl(s, F_GETFL, 0);
fcntl(s, F_SETFL, flags ^ O_NONBLOCK);
#else
unsigned long opt = 0;
ioctlsocket(s, FIONBIO, &opt);
#endif
}
void irc::sockets::NonBlocking(int s)
{
#ifndef WIN32
int flags = fcntl(s, F_GETFL, 0);
fcntl(s, F_SETFL, flags | O_NONBLOCK);
#else
unsigned long opt = 1;
ioctlsocket(s, FIONBIO, &opt);
#endif
}
/** This will bind a socket to a port. It works for UDP/TCP.
* It can only bind to IP addresses, if you wish to bind to hostnames
* you should first resolve them using class 'Resolver'.
*/
bool InspIRCd::BindSocket(int sockfd, int port, char* addr, bool dolisten)
{
/* We allocate 2 of these, because sockaddr_in6 is larger than sockaddr (ugh, hax) */
sockaddr* server = new sockaddr[2];
memset(server,0,sizeof(sockaddr)*2);
int ret, size;
if (*addr == '*')
*addr = 0;
#ifdef IPV6
if (*addr)
{
/* There is an address here. Is it ipv6? */
if (strchr(addr,':'))
{
/* Yes it is */
in6_addr addy;
if (inet_pton(AF_INET6, addr, &addy) < 1)
{
delete[] server;
return false;
}
((sockaddr_in6*)server)->sin6_family = AF_INET6;
memcpy(&(((sockaddr_in6*)server)->sin6_addr), &addy, sizeof(in6_addr));
((sockaddr_in6*)server)->sin6_port = htons(port);
size = sizeof(sockaddr_in6);
}
else
{
/* No, its not */
in_addr addy;
if (inet_pton(AF_INET, addr, &addy) < 1)
{
delete[] server;
return false;
}
((sockaddr_in*)server)->sin_family = AF_INET;
((sockaddr_in*)server)->sin_addr = addy;
((sockaddr_in*)server)->sin_port = htons(port);
size = sizeof(sockaddr_in);
}
}
else
{
if (port == -1)
{
/* Port -1: Means UDP IPV4 port binding - Special case
* used by DNS engine.
*/
((sockaddr_in*)server)->sin_family = AF_INET;
((sockaddr_in*)server)->sin_addr.s_addr = htonl(INADDR_ANY);
((sockaddr_in*)server)->sin_port = 0;
size = sizeof(sockaddr_in);
}
else
{
/* Theres no address here, default to ipv6 bind to all */
((sockaddr_in6*)server)->sin6_family = AF_INET6;
memset(&(((sockaddr_in6*)server)->sin6_addr), 0, sizeof(in6_addr));
((sockaddr_in6*)server)->sin6_port = htons(port);
size = sizeof(sockaddr_in6);
}
}
#else
/* If we aren't built with ipv6, the choice becomes simple */
((sockaddr_in*)server)->sin_family = AF_INET;
if (*addr)
{
/* There is an address here. */
in_addr addy;
if (inet_pton(AF_INET, addr, &addy) < 1)
{
delete[] server;
return false;
}
((sockaddr_in*)server)->sin_addr = addy;
}
else
{
/* Bind ipv4 to all */
((sockaddr_in*)server)->sin_addr.s_addr = htonl(INADDR_ANY);
}
/* Bind ipv4 port number */
((sockaddr_in*)server)->sin_port = htons(port);
size = sizeof(sockaddr_in);
#endif
ret = bind(sockfd, server, size);
delete[] server;
if (ret < 0)
{
return false;
}
else
{
if (dolisten)
{
if (listen(sockfd, Config->MaxConn) == -1)
{
this->Log(DEFAULT,"ERROR in listen(): %s",strerror(errno));
return false;
}
else
{
this->Log(DEBUG,"New socket binding for %d with listen: %s:%d", sockfd, addr, port);
NonBlocking(sockfd);
return true;
}
}
else
{
this->Log(DEBUG,"New socket binding for %d without listen: %s:%d", sockfd, addr, port);
return true;
}
}
}
// Open a TCP Socket
int irc::sockets::OpenTCPSocket(char* addr, int socktype)
{
int sockfd;
int on = 1;
struct linger linger = { 0 };
#ifdef IPV6
if (strchr(addr,':') || (!*addr))
sockfd = socket (PF_INET6, socktype, 0);
else
sockfd = socket (PF_INET, socktype, 0);
if (sockfd < 0)
#else
if ((sockfd = socket (PF_INET, socktype, 0)) < 0)
#endif
{
return ERROR;
}
else
{
setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, (char*)&on, sizeof(on));
/* This is BSD compatible, setting l_onoff to 0 is *NOT* http://web.irc.org/mla/ircd-dev/msg02259.html */
linger.l_onoff = 1;
linger.l_linger = 1;
setsockopt(sockfd, SOL_SOCKET, SO_LINGER, (char*)&linger,sizeof(linger));
return (sockfd);
}
}
/* XXX: Probably belongs in class InspIRCd */
int InspIRCd::BindPorts(bool bail, int &ports_found, FailedPortList &failed_ports)
{
char configToken[MAXBUF], Addr[MAXBUF], Type[MAXBUF];
int bound = 0;
bool started_with_nothing = (Config->ports.size() == 0);
std::vector<std::pair<std::string, int> > old_ports;
/* XXX: Make a copy of the old ip/port pairs here */
for (std::vector<ListenSocket*>::iterator o = Config->ports.begin(); o != Config->ports.end(); ++o)
old_ports.push_back(make_pair((*o)->GetIP(), (*o)->GetPort()));
for (int count = 0; count < Config->ConfValueEnum(Config->config_data, "bind"); count++)
{
Config->ConfValue(Config->config_data, "bind", "port", count, configToken, MAXBUF);
Config->ConfValue(Config->config_data, "bind", "address", count, Addr, MAXBUF);
Config->ConfValue(Config->config_data, "bind", "type", count, Type, MAXBUF);
if ((!*Type) || (!strcmp(Type,"clients")))
{
irc::portparser portrange(configToken, false);
int portno = -1;
while ((portno = portrange.GetToken()))
{
if (*Addr == '*')
*Addr = 0;
bool skip = false;
for (std::vector<ListenSocket*>::iterator n = Config->ports.begin(); n != Config->ports.end(); ++n)
{
if (((*n)->GetIP() == Addr) && ((*n)->GetPort() == portno))
{
skip = true;
/* XXX: Here, erase from our copy of the list */
for (std::vector<std::pair<std::string, int> >::iterator k = old_ports.begin(); k != old_ports.end(); ++k)
{
if ((k->first == Addr) && (k->second == portno))
{
old_ports.erase(k);
break;
}
}
}
}
if (!skip)
{
ListenSocket* ll = new ListenSocket(this, portno, Addr);
if (ll->GetFd() > -1)
{
bound++;
Config->ports.push_back(ll);
}
else
{
failed_ports.push_back(std::make_pair(Addr, portno));
}
ports_found++;
}
}
}
}
/* XXX: Here, anything left in our copy list, close as removed */
if (!started_with_nothing)
{
for (size_t k = 0; k < old_ports.size(); ++k)
{
for (std::vector<ListenSocket*>::iterator n = Config->ports.begin(); n != Config->ports.end(); ++n)
{
if (((*n)->GetIP() == old_ports[k].first) && ((*n)->GetPort() == old_ports[k].second))
{
this->Log(DEFAULT,"Port binding %s:%d was removed from the config file, closing.", old_ports[k].first.c_str(), old_ports[k].second);
delete *n;
Config->ports.erase(n);
break;
}
}
}
}
return bound;
}
const char* irc::sockets::insp_ntoa(insp_inaddr n)
{
static char buf[1024];
inet_ntop(AF_FAMILY, &n, buf, sizeof(buf));
return buf;
}
int irc::sockets::insp_aton(const char* a, insp_inaddr* n)
{
return inet_pton(AF_FAMILY, a, n);
}
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