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1 /*       +------------------------------------+
2  *       | Inspire Internet Relay Chat Daemon |
3  *       +------------------------------------+
4  *
5  *  InspIRCd: (C) 2002-2008 InspIRCd Development Team
6  * See: http://www.inspircd.org/wiki/index.php/Credits
7  *
8  * This program is free but copyrighted software; see
9  *            the file COPYING for details.
10  *
11  * ---------------------------------------------------
12  */
13
14 /* $Core: libIRCDsocket */
15
16 #include "inspircd.h"
17 #include "socket.h"
18 #include "socketengine.h"
19 #include "wildcard.h"
20
21 using namespace irc::sockets;
22
23 /* Private static member data must be initialized in this manner */
24 unsigned int ListenSocket::socketcount = 0;
25 sockaddr* ListenSocket::sock_us = NULL;
26 sockaddr* ListenSocket::client = NULL;
27 sockaddr* ListenSocket::raddr = NULL;
28
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.
33  */
34 const unsigned 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 */
42 };
43
44
45 ListenSocket::ListenSocket(InspIRCd* Instance, int port, char* addr) : ServerInstance(Instance), desc("plaintext"), bind_addr(addr), bind_port(port)
46 {
47         this->SetFd(OpenTCPSocket(addr));
48         if (this->GetFd() > -1)
49         {
50                 if (!Instance->BindSocket(this->fd,port,addr))
51                         this->fd = -1;
52 #ifdef IPV6
53                 if ((!*addr) || (strchr(addr,':')))
54                         this->family = AF_INET6;
55                 else
56 #endif
57                 this->family = AF_INET;
58                 Instance->SE->AddFd(this);
59         }
60         /* Saves needless allocations */
61         if (socketcount == 0)
62         {
63                 /* All instances of ListenSocket share these, so reference count it */
64                 ServerInstance->Logs->Log("SOCKET", DEBUG,"Allocate sockaddr structures");
65                 sock_us = new sockaddr[2];
66                 client = new sockaddr[2];
67                 raddr = new sockaddr[2];
68         }
69         socketcount++;
70 }
71
72 ListenSocket::~ListenSocket()
73 {
74         if (this->GetFd() > -1)
75         {
76                 ServerInstance->SE->DelFd(this);
77                 ServerInstance->Logs->Log("SOCKET", DEBUG,"Shut down listener on fd %d", this->fd);
78                 if (ServerInstance->SE->Shutdown(this, 2) || ServerInstance->SE->Close(this))
79                         ServerInstance->Logs->Log("SOCKET", DEBUG,"Failed to cancel listener: %s", strerror(errno));
80                 this->fd = -1;
81         }
82         socketcount--;
83         if (socketcount == 0)
84         {
85                 delete[] sock_us;
86                 delete[] client;
87                 delete[] raddr;
88         }
89 }
90
91 void ListenSocket::HandleEvent(EventType e, int err)
92 {
93         switch (e)
94         {
95                 case EVENT_ERROR:
96                         ServerInstance->Logs->Log("SOCKET",DEBUG,"HandleEvent for listensocket GOT AN ERROR! well shit! '%s'", strerror(err));
97                 break;
98                 case EVENT_WRITE:
99                         ServerInstance->Logs->Log("SOCKET",DEBUG,"*** BUG *** HandleEvent for listensocket got a WRITE event!!!");
100                 break;
101                 case EVENT_READ:
102                 {
103                         ServerInstance->Logs->Log("SOCKET",DEBUG,"HandleEvent for Listensoket");
104                         socklen_t uslen, length;                // length of our port number
105                         int incomingSockfd, in_port;
106
107 #ifdef IPV6
108                         if (this->family == AF_INET6)
109                         {
110                                 uslen = sizeof(sockaddr_in6);
111                                 length = sizeof(sockaddr_in6);
112                         }
113                         else
114 #endif
115                         {
116                                 uslen = sizeof(sockaddr_in);
117                                 length = sizeof(sockaddr_in);
118                         }
119
120                         ServerInstance->Logs->Log("SOCKET",DEBUG,"Call to accept with client=%08lx, length=%d", client, length);
121                         incomingSockfd = ServerInstance->SE->Accept(this, (sockaddr*)client, &length);
122
123                         if ((incomingSockfd > -1) && (!ServerInstance->SE->GetSockName(this, sock_us, &uslen)))
124                         {
125                                 char buf[MAXBUF];
126                                 char target[MAXBUF];    
127
128                                 *target = *buf = '\0';
129
130 #ifdef IPV6
131                                 if (this->family == AF_INET6)
132                                 {
133                                         in_port = ntohs(((sockaddr_in6*)sock_us)->sin6_port);
134                                         inet_ntop(AF_INET6, &((const sockaddr_in6*)client)->sin6_addr, buf, sizeof(buf));
135                                         socklen_t raddrsz = sizeof(sockaddr_in6);
136                                         if (getpeername(incomingSockfd, (sockaddr*) raddr, &raddrsz) == 0)
137                                                 inet_ntop(AF_INET6, &((const sockaddr_in6*)raddr)->sin6_addr, target, sizeof(target));
138                                         else
139                                                 ServerInstance->Logs->Log("SOCKET", DEBUG, "Can't get peername: %s", strerror(errno));
140                                 }
141                                 else
142 #endif
143                                 {
144                                         inet_ntop(AF_INET, &((const sockaddr_in*)client)->sin_addr, buf, sizeof(buf));
145                                         in_port = ntohs(((sockaddr_in*)sock_us)->sin_port);
146                                         socklen_t raddrsz = sizeof(sockaddr_in);
147                                         if (getpeername(incomingSockfd, (sockaddr*) raddr, &raddrsz) == 0)
148                                                 inet_ntop(AF_INET, &((const sockaddr_in*)raddr)->sin_addr, target, sizeof(target));
149                                         else
150                                                 ServerInstance->Logs->Log("SOCKET", DEBUG, "Can't get peername: %s", strerror(errno));
151                                 }
152
153                                 ServerInstance->SE->NonBlocking(incomingSockfd);
154                                 ServerInstance->stats->statsAccept++;
155                                 ServerInstance->Users->AddUser(ServerInstance, incomingSockfd, in_port, false, this->family, client, target);   
156                         }
157                         else
158                         {
159                                 ServerInstance->SE->Shutdown(incomingSockfd, 2);
160                                 ServerInstance->SE->Close(incomingSockfd);
161                                 ServerInstance->stats->statsRefused++;
162                         }
163                 }
164                 break;
165         }
166 }
167
168 /* Match raw bytes using CIDR bit matching, used by higher level MatchCIDR() */
169 bool irc::sockets::MatchCIDRBits(unsigned char* address, unsigned char* mask, unsigned int mask_bits)
170 {
171         unsigned int divisor = mask_bits / 8; /* Number of whole bytes in the mask */
172         unsigned int modulus = mask_bits % 8; /* Remaining bits in the mask after whole bytes are dealt with */
173
174         /* First (this is faster) compare the odd bits with logic ops */
175         if (modulus)
176                 if ((address[divisor] & inverted_bits[modulus]) != (mask[divisor] & inverted_bits[modulus]))
177                         /* If they dont match, return false */
178                         return false;
179
180         /* Secondly (this is slower) compare the whole bytes */
181         if (memcmp(address, mask, divisor))
182                 return false;
183
184         /* The address matches the mask, to mask_bits bits of mask */
185         return true;
186 }
187
188 /* Match CIDR, but dont attempt to match() against leading *!*@ sections */
189 bool irc::sockets::MatchCIDR(const char* address, const char* cidr_mask)
190 {
191         return MatchCIDR(address, cidr_mask, false);
192 }
193
194 /* 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
195  * If you have a lot of hosts to match, youre probably better off building your mask once
196  * and then using the lower level MatchCIDRBits directly.
197  *
198  * This will also attempt to match any leading usernames or nicknames on the mask, using
199  * match(), when match_with_username is true.
200  */
201 bool irc::sockets::MatchCIDR(const char* address, const char* cidr_mask, bool match_with_username)
202 {
203         unsigned char addr_raw[16];
204         unsigned char mask_raw[16];
205         unsigned int bits = 0;
206         char* mask = NULL;
207
208         /* The caller is trying to match ident@<mask>/bits.
209          * Chop off the ident@ portion, use match() on it
210          * seperately.
211          */
212         if (match_with_username)
213         {
214                 /* Duplicate the strings, and try to find the position
215                  * of the @ symbol in each */
216                 char* address_dupe = strdup(address);
217                 char* cidr_dupe = strdup(cidr_mask);
218         
219                 /* Use strchr not strrchr, because its going to be nearer to the left */
220                 char* username_mask_pos = strrchr(cidr_dupe, '@');
221                 char* username_addr_pos = strrchr(address_dupe, '@');
222
223                 /* Both strings have an @ symbol in them */
224                 if (username_mask_pos && username_addr_pos)
225                 {
226                         /* Zero out the location of the @ symbol */
227                         *username_mask_pos = *username_addr_pos = 0;
228
229                         /* Try and match() the strings before the @
230                          * symbols, and recursively call MatchCIDR without
231                          * username matching enabled to match the host part.
232                          */
233                         bool result = (match(address_dupe, cidr_dupe) && MatchCIDR(username_addr_pos + 1, username_mask_pos + 1, false));
234
235                         /* Free the stuff we created */
236                         free(address_dupe);
237                         free(cidr_dupe);
238
239                         /* Return a result */
240                         return result;
241                 }
242                 else
243                 {
244                         /* One or both didnt have an @ in,
245                          * just match as CIDR
246                          */
247                         free(address_dupe);
248                         free(cidr_dupe);
249                         mask = strdup(cidr_mask);
250                 }
251         }
252         else
253         {
254                 /* Make a copy of the cidr mask string,
255                  * we're going to change it
256                  */
257                 mask = strdup(cidr_mask);
258         }
259
260         in_addr  address_in4;
261         in_addr  mask_in4;
262
263
264         /* Use strrchr for this, its nearer to the right */
265         char* bits_chars = strrchr(mask,'/');
266
267         if (bits_chars)
268         {
269                 bits = atoi(bits_chars + 1);
270                 *bits_chars = 0;
271         }
272         else
273         {
274                 /* No 'number of bits' field! */
275                 free(mask);
276                 return false;
277         }
278
279 #ifdef SUPPORT_IP6LINKS
280         in6_addr address_in6;
281         in6_addr mask_in6;
282
283         if (inet_pton(AF_INET6, address, &address_in6) > 0)
284         {
285                 if (inet_pton(AF_INET6, mask, &mask_in6) > 0)
286                 {
287                         memcpy(&addr_raw, &address_in6.s6_addr, 16);
288                         memcpy(&mask_raw, &mask_in6.s6_addr, 16);
289
290                         if (bits > 128)
291                                 bits = 128;
292                 }
293                 else
294                 {
295                         /* The address was valid ipv6, but the mask
296                          * that goes with it wasnt.
297                          */
298                         free(mask);
299                         return false;
300                 }
301         }
302         else
303 #endif
304         if (inet_pton(AF_INET, address, &address_in4) > 0)
305         {
306                 if (inet_pton(AF_INET, mask, &mask_in4) > 0)
307                 {
308                         memcpy(&addr_raw, &address_in4.s_addr, 4);
309                         memcpy(&mask_raw, &mask_in4.s_addr, 4);
310
311                         if (bits > 32)
312                                 bits = 32;
313                 }
314                 else
315                 {
316                         /* The address was valid ipv4,
317                          * but the mask that went with it wasnt.
318                          */
319                         free(mask);
320                         return false;
321                 }
322         }
323         else
324         {
325                 /* The address was neither ipv4 or ipv6 */
326                 free(mask);
327                 return false;
328         }
329
330         /* Low-level-match the bits in the raw data */
331         free(mask);
332         return MatchCIDRBits(addr_raw, mask_raw, bits);
333 }
334
335 /** This will bind a socket to a port. It works for UDP/TCP.
336  * It can only bind to IP addresses, if you wish to bind to hostnames
337  * you should first resolve them using class 'Resolver'.
338  */ 
339 bool InspIRCd::BindSocket(int sockfd, int port, const char* addr, bool dolisten)
340 {
341         /* We allocate 2 of these, because sockaddr_in6 is larger than sockaddr (ugh, hax) */
342         sockaddr* servaddr = new sockaddr[2];
343         memset(servaddr,0,sizeof(sockaddr)*2);
344
345         int ret, size;
346
347         if (*addr == '*')
348                 addr = "";
349
350 #ifdef IPV6
351         if (*addr)
352         {
353                 /* There is an address here. Is it ipv6? */
354                 if (strchr(addr,':'))
355                 {
356                         /* Yes it is */
357                         in6_addr addy;
358                         if (inet_pton(AF_INET6, addr, &addy) < 1)
359                         {
360                                 delete[] servaddr;
361                                 return false;
362                         }
363
364                         ((sockaddr_in6*)servaddr)->sin6_family = AF_INET6;
365                         memcpy(&(((sockaddr_in6*)servaddr)->sin6_addr), &addy, sizeof(in6_addr));
366                         ((sockaddr_in6*)servaddr)->sin6_port = htons(port);
367                         size = sizeof(sockaddr_in6);
368                 }
369                 else
370                 {
371                         /* No, its not */
372                         in_addr addy;
373                         if (inet_pton(AF_INET, addr, &addy) < 1)
374                         {
375                                 delete[] servaddr;
376                                 return false;
377                         }
378
379                         ((sockaddr_in*)servaddr)->sin_family = AF_INET;
380                         ((sockaddr_in*)servaddr)->sin_addr = addy;
381                         ((sockaddr_in*)servaddr)->sin_port = htons(port);
382                         size = sizeof(sockaddr_in);
383                 }
384         }
385         else
386         {
387                 if (port == -1)
388                 {
389                         /* Port -1: Means UDP IPV4 port binding - Special case
390                          * used by DNS engine.
391                          */
392                         ((sockaddr_in*)servaddr)->sin_family = AF_INET;
393                         ((sockaddr_in*)servaddr)->sin_addr.s_addr = htonl(INADDR_ANY);
394                         ((sockaddr_in*)servaddr)->sin_port = 0;
395                         size = sizeof(sockaddr_in);
396                 }
397                 else
398                 {
399                         /* Theres no address here, default to ipv6 bind to all */
400                         ((sockaddr_in6*)servaddr)->sin6_family = AF_INET6;
401                         memset(&(((sockaddr_in6*)servaddr)->sin6_addr), 0, sizeof(in6_addr));
402                         ((sockaddr_in6*)servaddr)->sin6_port = htons(port);
403                         size = sizeof(sockaddr_in6);
404                 }
405         }
406 #else
407         /* If we aren't built with ipv6, the choice becomes simple */
408         ((sockaddr_in*)servaddr)->sin_family = AF_INET;
409         if (*addr)
410         {
411                 /* There is an address here. */
412                 in_addr addy;
413                 if (inet_pton(AF_INET, addr, &addy) < 1)
414                 {
415                         delete[] servaddr;
416                         return false;
417                 }
418                 ((sockaddr_in*)servaddr)->sin_addr = addy;
419         }
420         else
421         {
422                 /* Bind ipv4 to all */
423                 ((sockaddr_in*)servaddr)->sin_addr.s_addr = htonl(INADDR_ANY);
424         }
425         /* Bind ipv4 port number */
426         ((sockaddr_in*)servaddr)->sin_port = htons(port);
427         size = sizeof(sockaddr_in);
428 #endif
429         ret = SE->Bind(sockfd, servaddr, size);
430         delete[] servaddr;
431
432         if (ret < 0)
433         {
434                 return false;
435         }
436         else
437         {
438                 if (dolisten)
439                 {
440                         if (SE->Listen(sockfd, Config->MaxConn) == -1)
441                         {
442                                 this->Logs->Log("SOCKET",DEFAULT,"ERROR in listen(): %s",strerror(errno));
443                                 return false;
444                         }
445                         else
446                         {
447                                 this->Logs->Log("SOCKET",DEBUG,"New socket binding for %d with listen: %s:%d", sockfd, addr, port);
448                                 SE->NonBlocking(sockfd);
449                                 return true;
450                         }
451                 }
452                 else
453                 {
454                         this->Logs->Log("SOCKET",DEBUG,"New socket binding for %d without listen: %s:%d", sockfd, addr, port);
455                         return true;
456                 }
457         }
458 }
459
460 // Open a TCP Socket
461 int irc::sockets::OpenTCPSocket(char* addr, int socktype)
462 {
463         int sockfd;
464         int on = 1;
465         addr = addr;
466         struct linger linger = { 0, 0 };
467 #ifdef IPV6
468         if (strchr(addr,':') || (!*addr))
469                 sockfd = socket (PF_INET6, socktype, 0);
470         else
471                 sockfd = socket (PF_INET, socktype, 0);
472         if (sockfd < 0)
473 #else
474         if ((sockfd = socket (PF_INET, socktype, 0)) < 0)
475 #endif
476         {
477                 return ERROR;
478         }
479         else
480         {
481                 setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, (char*)&on, sizeof(on));
482                 /* This is BSD compatible, setting l_onoff to 0 is *NOT* http://web.irc.org/mla/ircd-dev/msg02259.html */
483                 linger.l_onoff = 1;
484                 linger.l_linger = 1;
485                 setsockopt(sockfd, SOL_SOCKET, SO_LINGER, (char*)&linger,sizeof(linger));
486                 return (sockfd);
487         }
488 }
489
490 int InspIRCd::BindPorts(bool, int &ports_found, FailedPortList &failed_ports)
491 {
492         char configToken[MAXBUF], Addr[MAXBUF], Type[MAXBUF];
493         int bound = 0;
494         bool started_with_nothing = (Config->ports.size() == 0);
495         std::vector<std::pair<std::string, int> > old_ports;
496
497         /* XXX: Make a copy of the old ip/port pairs here */
498         for (std::vector<ListenSocket*>::iterator o = Config->ports.begin(); o != Config->ports.end(); ++o)
499                 old_ports.push_back(make_pair((*o)->GetIP(), (*o)->GetPort()));
500
501         for (int count = 0; count < Config->ConfValueEnum(Config->config_data, "bind"); count++)
502         {
503                 Config->ConfValue(Config->config_data, "bind", "port", count, configToken, MAXBUF);
504                 Config->ConfValue(Config->config_data, "bind", "address", count, Addr, MAXBUF);
505                 Config->ConfValue(Config->config_data, "bind", "type", count, Type, MAXBUF);
506                 
507                 if (strncmp(Addr, "::ffff:", 7) == 0)
508                         this->Logs->Log("SOCKET",DEFAULT, "Using 4in6 (::ffff:) isn't recommended. You should bind IPv4 addresses directly instead.");
509                 
510                 if ((!*Type) || (!strcmp(Type,"clients")))
511                 {
512                         irc::portparser portrange(configToken, false);
513                         int portno = -1;
514                         while ((portno = portrange.GetToken()))
515                         {
516                                 if (*Addr == '*')
517                                         *Addr = 0;
518
519                                 bool skip = false;
520                                 for (std::vector<ListenSocket*>::iterator n = Config->ports.begin(); n != Config->ports.end(); ++n)
521                                 {
522                                         if (((*n)->GetIP() == Addr) && ((*n)->GetPort() == portno))
523                                         {
524                                                 skip = true;
525                                                 /* XXX: Here, erase from our copy of the list */
526                                                 for (std::vector<std::pair<std::string, int> >::iterator k = old_ports.begin(); k != old_ports.end(); ++k)
527                                                 {
528                                                         if ((k->first == Addr) && (k->second == portno))
529                                                         {
530                                                                 old_ports.erase(k);
531                                                                 break;
532                                                         }
533                                                 }
534                                         }
535                                 }
536                                 if (!skip)
537                                 {
538                                         ListenSocket* ll = new ListenSocket(this, portno, Addr);
539                                         if (ll->GetFd() > -1)
540                                         {
541                                                 bound++;
542                                                 Config->ports.push_back(ll);
543                                         }
544                                         else
545                                         {
546                                                 failed_ports.push_back(std::make_pair(Addr, portno));
547                                         }
548                                         ports_found++;
549                                 }
550                         }
551                 }
552         }
553
554         /* XXX: Here, anything left in our copy list, close as removed */
555         if (!started_with_nothing)
556         {
557                 for (size_t k = 0; k < old_ports.size(); ++k)
558                 {
559                         for (std::vector<ListenSocket*>::iterator n = Config->ports.begin(); n != Config->ports.end(); ++n)
560                         {
561                                 if (((*n)->GetIP() == old_ports[k].first) && ((*n)->GetPort() == old_ports[k].second))
562                                 {
563                                         this->Logs->Log("SOCKET",DEFAULT,"Port binding %s:%d was removed from the config file, closing.", old_ports[k].first.c_str(), old_ports[k].second);
564                                         delete *n;
565                                         Config->ports.erase(n);
566                                         break;
567                                 }
568                         }
569                 }
570         }
571
572         return bound;
573 }
574
575 const char* irc::sockets::insp_ntoa(insp_inaddr n)
576 {
577         static char buf[1024];
578         inet_ntop(AF_FAMILY, &n, buf, sizeof(buf));
579         return buf;
580 }
581
582 int irc::sockets::insp_aton(const char* a, insp_inaddr* n)
583 {
584         return inet_pton(AF_FAMILY, a, n);
585 }
586