1 /* +------------------------------------+
2 * | Inspire Internet Relay Chat Daemon |
3 * +------------------------------------+
5 * InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev.
7 * <brain@chatspike.net>
8 * <Craig@chatspike.net>
10 * Written by Craig Edwards, Craig McLure, and others.
11 * This program is free but copyrighted software; see
12 * the file COPYING for details.
14 * ---------------------------------------------------
18 #include "configreader.h"
21 #include "inspstring.h"
23 #include "socketengine.h"
27 using namespace irc::sockets;
29 /* Used when comparing CIDR masks for the modulus bits left over.
30 * A lot of ircd's seem to do this:
31 * ((-1) << (8 - (mask % 8)))
32 * But imho, it sucks in comparison to a nice neat lookup table.
34 const char inverted_bits[8] = { 0x00, /* 00000000 - 0 bits - never actually used */
35 0x80, /* 10000000 - 1 bits */
36 0xC0, /* 11000000 - 2 bits */
37 0xE0, /* 11100000 - 3 bits */
38 0xF0, /* 11110000 - 4 bits */
39 0xF8, /* 11111000 - 5 bits */
40 0xFC, /* 11111100 - 6 bits */
41 0xFE /* 11111110 - 7 bits */
44 /* Match raw bytes using CIDR bit matching, used by higher level MatchCIDR() */
45 bool irc::sockets::MatchCIDRBits(unsigned char* address, unsigned char* mask, unsigned int mask_bits)
47 unsigned int modulus = mask_bits % 8; /* Number of whole bytes in the mask */
48 unsigned int divisor = mask_bits / 8; /* Remaining bits in the mask after whole bytes are dealt with */
50 /* First compare the whole bytes, if they dont match, return false */
51 if (memcmp(address, mask, divisor))
54 /* Now if there are any remainder bits, we compare them with logic AND */
56 if ((address[divisor] & inverted_bits[modulus]) != (mask[divisor] & inverted_bits[modulus]))
57 /* If they dont match, return false */
60 /* The address matches the mask, to mask_bits bits of mask */
64 /* Match CIDR, but dont attempt to match() against leading *!*@ sections */
65 bool irc::sockets::MatchCIDR(const char* address, const char* cidr_mask)
67 return MatchCIDR(address, cidr_mask, false);
70 /* 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
71 * If you have a lot of hosts to match, youre probably better off building your mask once
72 * and then using the lower level MatchCIDRBits directly.
74 * This will also attempt to match any leading usernames or nicknames on the mask, using
75 * match(), when match_with_username is true.
77 bool irc::sockets::MatchCIDR(const char* address, const char* cidr_mask, bool match_with_username)
79 unsigned char addr_raw[16];
80 unsigned char mask_raw[16];
81 unsigned int bits = 0;
84 /* The caller is trying to match ident@<mask>/bits.
85 * Chop off the ident@ portion, use match() on it
88 if (match_with_username)
90 /* Duplicate the strings, and try to find the position
91 * of the @ symbol in each */
92 char* address_dupe = strdup(address);
93 char* cidr_dupe = strdup(cidr_mask);
95 /* Use strchr not strrchr, because its going to be nearer to the left */
96 char* username_mask_pos = strrchr(cidr_dupe, '@');
97 char* username_addr_pos = strrchr(address_dupe, '@');
99 /* Both strings have an @ symbol in them */
100 if (username_mask_pos && username_addr_pos)
102 /* Zero out the location of the @ symbol */
103 *username_mask_pos = *username_addr_pos = 0;
105 /* Try and match() the strings before the @
106 * symbols, and recursively call MatchCIDR without
107 * username matching enabled to match the host part.
109 bool result = (match(address_dupe, cidr_dupe) && MatchCIDR(username_addr_pos + 1, username_mask_pos + 1, false));
111 /* Free the stuff we created */
115 /* Return a result */
120 /* One or both didnt have an @ in,
125 mask = strdup(cidr_mask);
130 /* Make a copy of the cidr mask string,
131 * we're going to change it
133 mask = strdup(cidr_mask);
140 /* Use strrchr for this, its nearer to the right */
141 char* bits_chars = strrchr(mask,'/');
145 bits = atoi(bits_chars + 1);
150 /* No 'number of bits' field! */
154 #ifdef SUPPORT_IP6LINKS
155 in6_addr address_in6;
158 if (inet_pton(AF_INET6, address, &address_in6) > 0)
160 if (inet_pton(AF_INET6, mask, &mask_in6) > 0)
162 memcpy(&addr_raw, &address_in6.s6_addr, 16);
163 memcpy(&mask_raw, &mask_in6.s6_addr, 16);
170 /* The address was valid ipv6, but the mask
171 * that goes with it wasnt.
179 if (inet_pton(AF_INET, address, &address_in4) > 0)
181 if (inet_pton(AF_INET, mask, &mask_in4) > 0)
183 memcpy(&addr_raw, &address_in4.s_addr, 4);
184 memcpy(&mask_raw, &mask_in4.s_addr, 4);
191 /* The address was valid ipv4,
192 * but the mask that went with it wasnt.
200 /* The address was neither ipv4 or ipv6 */
205 /* Low-level-match the bits in the raw data */
207 return MatchCIDRBits(addr_raw, mask_raw, bits);
210 inline void irc::sockets::Blocking(int s)
212 int flags = fcntl(s, F_GETFL, 0);
213 fcntl(s, F_SETFL, flags ^ O_NONBLOCK);
216 inline void irc::sockets::NonBlocking(int s)
218 int flags = fcntl(s, F_GETFL, 0);
219 fcntl(s, F_SETFL, flags | O_NONBLOCK);
223 /** This will bind a socket to a port. It works for UDP/TCP.
224 * It can only bind to IP addresses, if you wish to bind to hostnames
225 * you should first resolve them using class 'Resolver'.
227 bool InspIRCd::BindSocket(int sockfd, insp_sockaddr client, insp_sockaddr server, int port, char* addr)
229 memset(&server,0,sizeof(server));
235 if ((*addr) && (insp_aton(addr,&addy) < 1))
237 this->Log(DEBUG,"Invalid IP '%s' given to BindSocket()", addr);
242 server.sin6_family = AF_FAMILY;
244 server.sin_family = AF_FAMILY;
249 memcpy(&addy, &server.sin6_addr, sizeof(in6_addr));
251 server.sin_addr.s_addr = htonl(INADDR_ANY);
257 memcpy(&addy, &server.sin6_addr, sizeof(in6_addr));
259 server.sin_addr = addy;
263 server.sin6_port = htons(port);
265 server.sin_port = htons(port);
267 if (bind(sockfd,(struct sockaddr*)&server,sizeof(server)) < 0)
273 this->Log(DEBUG,"Bound port %s:%d",*addr ? addr : "*",port);
274 if (listen(sockfd, Config->MaxConn) == -1)
276 this->Log(DEFAULT,"ERROR in listen(): %s",strerror(errno));
289 int irc::sockets::OpenTCPSocket()
293 struct linger linger = { 0 };
295 if ((sockfd = socket (AF_FAMILY, SOCK_STREAM, 0)) < 0)
301 setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
302 /* This is BSD compatible, setting l_onoff to 0 is *NOT* http://web.irc.org/mla/ircd-dev/msg02259.html */
305 setsockopt(sockfd, SOL_SOCKET, SO_LINGER, &linger,sizeof(linger));
310 /* XXX: Probably belongs in class InspIRCd */
311 bool InspIRCd::HasPort(int port, char* addr)
313 for (unsigned long count = 0; count < stats->BoundPortCount; count++)
315 if ((port == Config->ports[count]) && (!strcasecmp(Config->addrs[count],addr)))
323 /* XXX: Probably belongs in class InspIRCd */
324 int InspIRCd::BindPorts(bool bail)
326 char configToken[MAXBUF], Addr[MAXBUF], Type[MAXBUF];
327 insp_sockaddr client, server;
328 int clientportcount = 0;
329 int BoundPortCount = 0;
333 int InitialPortCount = stats->BoundPortCount;
334 this->Log(DEBUG,"Initial port count: %d",InitialPortCount);
336 for (int count = 0; count < Config->ConfValueEnum(Config->config_data, "bind"); count++)
338 Config->ConfValue(Config->config_data, "bind", "port", count, configToken, MAXBUF);
339 Config->ConfValue(Config->config_data, "bind", "address", count, Addr, MAXBUF);
340 Config->ConfValue(Config->config_data, "bind", "type", count, Type, MAXBUF);
342 if (((!*Type) || (!strcmp(Type,"clients"))) && (!HasPort(atoi(configToken),Addr)))
344 // modules handle server bind types now
345 Config->ports[clientportcount+InitialPortCount] = atoi(configToken);
349 strlcpy(Config->addrs[clientportcount+InitialPortCount],Addr,256);
351 this->Log(DEBUG,"NEW binding %s:%s [%s] from config",Addr,configToken, Type);
354 int PortCount = clientportcount;
357 for (int count = InitialPortCount; count < InitialPortCount + PortCount; count++)
359 if ((Config->openSockfd[count] = OpenTCPSocket()) == ERROR)
361 this->Log(DEBUG,"Bad fd %d binding port [%s:%d]",Config->openSockfd[count],Config->addrs[count],Config->ports[count]);
365 if (!BindSocket(Config->openSockfd[count],client,server,Config->ports[count],Config->addrs[count]))
367 this->Log(DEFAULT,"Failed to bind port [%s:%d]: %s",Config->addrs[count],Config->ports[count],strerror(errno));
371 /* Associate the new open port with a slot in the socket engine */
372 if (Config->openSockfd[count] > -1)
374 if (!SE->AddFd(Config->openSockfd[count],true,X_LISTEN))
376 this->Log(DEFAULT,"ERK! Failed to add listening port to socket engine!");
377 shutdown(Config->openSockfd[count],2);
378 close(Config->openSockfd[count]);
386 return InitialPortCount + BoundPortCount;
390 this->Log(DEBUG,"There is nothing new to bind!");
392 return InitialPortCount;
395 for (int count = 0; count < Config->ConfValueEnum(Config->config_data, "bind"); count++)
397 Config->ConfValue(Config->config_data, "bind", "port", count, configToken, MAXBUF);
398 Config->ConfValue(Config->config_data, "bind", "address", count, Addr, MAXBUF);
399 Config->ConfValue(Config->config_data, "bind", "type", count, Type, MAXBUF);
401 if ((!*Type) || (!strcmp(Type,"clients")))
403 // modules handle server bind types now
404 Config->ports[clientportcount] = atoi(configToken);
406 // If the client put bind "*", this is an unrealism.
407 // We don't actually support this as documented, but
408 // i got fed up of people trying it, so now it converts
409 // it to an empty string meaning the same 'bind to all'.
413 strlcpy(Config->addrs[clientportcount],Addr,256);
415 this->Log(DEBUG,"Binding %s:%s [%s] from config",Addr,configToken, Type);
419 int PortCount = clientportcount;
421 for (int count = 0; count < PortCount; count++)
423 if ((Config->openSockfd[BoundPortCount] = OpenTCPSocket()) == ERROR)
425 this->Log(DEBUG,"Bad fd %d binding port [%s:%d]",Config->openSockfd[BoundPortCount],Config->addrs[count],Config->ports[count]);
429 if (!BindSocket(Config->openSockfd[BoundPortCount],client,server,Config->ports[count],Config->addrs[count]))
431 this->Log(DEFAULT,"Failed to bind port [%s:%d]: %s",Config->addrs[count],Config->ports[count],strerror(errno));
435 /* well we at least bound to one socket so we'll continue */
440 return BoundPortCount;
443 const char* irc::sockets::insp_ntoa(insp_inaddr n)
445 static char buf[1024];
446 inet_ntop(AF_FAMILY, &n, buf, sizeof(buf));
450 int irc::sockets::insp_aton(const char* a, insp_inaddr* n)
452 return inet_pton(AF_FAMILY, a, n);