/* +------------------------------------+ * | Inspire Internet Relay Chat Daemon | * +------------------------------------+ * * InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev. * E-mail: * * * * Written by Craig Edwards, Craig McLure, and others. * This program is free but copyrighted software; see * the file COPYING for details. * * --------------------------------------------------- */ #include #include "configreader.h" #include "socket.h" #include "inspircd.h" #include "inspstring.h" #include "helperfuncs.h" #include "socketengine.h" #include "wildcard.h" using namespace std; 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 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 */ }; /* 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@/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! */ 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); } inline void irc::sockets::Blocking(int s) { int flags = fcntl(s, F_GETFL, 0); fcntl(s, F_SETFL, flags ^ O_NONBLOCK); } inline void irc::sockets::NonBlocking(int s) { int flags = fcntl(s, F_GETFL, 0); fcntl(s, F_SETFL, flags | O_NONBLOCK); } /** 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, insp_sockaddr client, insp_sockaddr server, int port, char* addr) { memset(&server,0,sizeof(server)); insp_inaddr addy; if (*addr == '*') *addr = 0; if ((*addr) && (insp_aton(addr,&addy) < 1)) { log(DEBUG,"Invalid IP '%s' given to BindSocket()", addr); return false;; } #ifdef IPV6 server.sin6_family = AF_FAMILY; #else server.sin_family = AF_FAMILY; #endif if (!*addr) { #ifdef IPV6 memcpy(&addy, &server.sin6_addr, sizeof(in6_addr)); #else server.sin_addr.s_addr = htonl(INADDR_ANY); #endif } else { #ifdef IPV6 memcpy(&addy, &server.sin6_addr, sizeof(in6_addr)); #else server.sin_addr = addy; #endif } #ifdef IPV6 server.sin6_port = htons(port); #else server.sin_port = htons(port); #endif if (bind(sockfd,(struct sockaddr*)&server,sizeof(server)) < 0) { return false; } else { log(DEBUG,"Bound port %s:%d",*addr ? addr : "*",port); if (listen(sockfd, Config->MaxConn) == -1) { log(DEFAULT,"ERROR in listen(): %s",strerror(errno)); return false; } else { NonBlocking(sockfd); return true; } } } // Open a TCP Socket int irc::sockets::OpenTCPSocket() { int sockfd; int on = 1; struct linger linger = { 0 }; if ((sockfd = socket (AF_FAMILY, SOCK_STREAM, 0)) < 0) { log(DEFAULT,"Error creating TCP socket: %s",strerror(errno)); return (ERROR); } else { setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &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, &linger,sizeof(linger)); return (sockfd); } } /* XXX: Probably belongs in class InspIRCd */ bool InspIRCd::HasPort(int port, char* addr) { for (unsigned long count = 0; count < stats->BoundPortCount; count++) { if ((port == Config->ports[count]) && (!strcasecmp(Config->addrs[count],addr))) { return true; } } return false; } /* XXX: Probably belongs in class InspIRCd */ int InspIRCd::BindPorts(bool bail) { char configToken[MAXBUF], Addr[MAXBUF], Type[MAXBUF]; insp_sockaddr client, server; int clientportcount = 0; int BoundPortCount = 0; if (!bail) { int InitialPortCount = stats->BoundPortCount; log(DEBUG,"Initial port count: %d",InitialPortCount); 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"))) && (!HasPort(atoi(configToken),Addr))) { // modules handle server bind types now Config->ports[clientportcount+InitialPortCount] = atoi(configToken); if (*Addr == '*') *Addr = 0; strlcpy(Config->addrs[clientportcount+InitialPortCount],Addr,256); clientportcount++; log(DEBUG,"NEW binding %s:%s [%s] from config",Addr,configToken, Type); } } int PortCount = clientportcount; if (PortCount) { for (int count = InitialPortCount; count < InitialPortCount + PortCount; count++) { if ((Config->openSockfd[count] = OpenTCPSocket()) == ERROR) { log(DEBUG,"Bad fd %d binding port [%s:%d]",Config->openSockfd[count],Config->addrs[count],Config->ports[count]); } else { if (!BindSocket(Config->openSockfd[count],client,server,Config->ports[count],Config->addrs[count])) { log(DEFAULT,"Failed to bind port [%s:%d]: %s",Config->addrs[count],Config->ports[count],strerror(errno)); } else { /* Associate the new open port with a slot in the socket engine */ if (Config->openSockfd[count] > -1) { if (!SE->AddFd(Config->openSockfd[count],true,X_LISTEN)) { log(DEFAULT,"ERK! Failed to add listening port to socket engine!"); shutdown(Config->openSockfd[count],2); close(Config->openSockfd[count]); } else BoundPortCount++; } } } } return InitialPortCount + BoundPortCount; } else { log(DEBUG,"There is nothing new to bind!"); } return InitialPortCount; } 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"))) { // modules handle server bind types now Config->ports[clientportcount] = atoi(configToken); // If the client put bind "*", this is an unrealism. // We don't actually support this as documented, but // i got fed up of people trying it, so now it converts // it to an empty string meaning the same 'bind to all'. if (*Addr == '*') *Addr = 0; strlcpy(Config->addrs[clientportcount],Addr,256); clientportcount++; log(DEBUG,"Binding %s:%s [%s] from config",Addr,configToken, Type); } } int PortCount = clientportcount; for (int count = 0; count < PortCount; count++) { if ((Config->openSockfd[BoundPortCount] = OpenTCPSocket()) == ERROR) { log(DEBUG,"Bad fd %d binding port [%s:%d]",Config->openSockfd[BoundPortCount],Config->addrs[count],Config->ports[count]); } else { if (!BindSocket(Config->openSockfd[BoundPortCount],client,server,Config->ports[count],Config->addrs[count])) { log(DEFAULT,"Failed to bind port [%s:%d]: %s",Config->addrs[count],Config->ports[count],strerror(errno)); } else { /* well we at least bound to one socket so we'll continue */ BoundPortCount++; } } } return BoundPortCount; } 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); }