/[cvs]/eggdrop1.8/src/net.c
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Revision 1.3 - (show annotations) (download) (as text)
Mon Aug 23 21:27:40 2010 UTC (9 years, 1 month ago) by pseudo
Branch: MAIN
Changes since 1.2: +4 -4 lines
File MIME type: text/x-chdr
Modified src/compat/ replacements of gethostbyname2() and inet_ntop() to not compile when IPv6 is disabled.
Added a missing header preventing gethostbyname2() from compiling on FreeBSD.
Fixed few lines with wrong indentation.

1 /*
2 * net.c -- handles:
3 * all raw network i/o
4 *
5 * $Id: net.c,v 1.2 2010/08/05 18:12:05 pseudo Exp $
6 */
7 /*
8 * This is hereby released into the public domain.
9 * Robey Pointer, robey@netcom.com
10 *
11 * Changes after Feb 23, 1999 Copyright Eggheads Development Team
12 *
13 * Copyright (C) 1999 - 2010 Eggheads Development Team
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * as published by the Free Software Foundation; either version 2
18 * of the License, or (at your option) any later version.
19 *
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
28 */
29
30 #include <fcntl.h>
31 #include "main.h"
32 #include <limits.h>
33 #include <string.h>
34 #include <netdb.h>
35 #include <sys/socket.h>
36 #if HAVE_SYS_SELECT_H
37 # include <sys/select.h>
38 #endif
39 #include <netinet/in.h>
40 #include <arpa/inet.h>
41 #include <errno.h>
42 #if HAVE_UNISTD_H
43 # include <unistd.h>
44 #endif
45 #include <setjmp.h>
46
47 #ifndef HAVE_GETDTABLESIZE
48 # ifdef FD_SETSIZE
49 # define getdtablesize() FD_SETSIZE
50 # else
51 # define getdtablesize() 200
52 # endif
53 #endif
54
55 extern struct dcc_t *dcc;
56 extern int backgrd, use_stderr, resolve_timeout, dcc_total;
57 extern unsigned long otraffic_irc_today, otraffic_bn_today, otraffic_dcc_today,
58 otraffic_filesys_today, otraffic_trans_today,
59 otraffic_unknown_today;
60
61 char natip[121] = ""; /* Public IPv4 to report for systems behind NAT */
62 char listen_ip[121] = ""; /* IP (or hostname) for listening sockets */
63 char vhost[121] = ""; /* IPv4 vhost for outgoing connections */
64 #ifdef IPV6
65 char vhost6[121] = ""; /* IPv6 vhost for outgoing connections */
66 int pref_af = 0; /* Prefer IPv6 over IPv4? */
67 #endif
68 char firewall[121] = ""; /* Socks server for firewall. */
69 int firewallport = 1080; /* Default port of socks 4/5 firewalls. */
70 char botuser[21] = "eggdrop"; /* Username of the user running the bot. */
71 int dcc_sanitycheck = 0; /* Do some sanity checking on dcc connections. */
72
73 sock_list *socklist = NULL; /* Enough to be safe. */
74 sigjmp_buf alarmret; /* Env buffer for alarm() returns. */
75
76 /* Types of proxies */
77 #define PROXY_SOCKS 1
78 #define PROXY_SUN 2
79
80
81 /* I need an UNSIGNED long for dcc type stuff
82 */
83 IP my_atoul(char *s)
84 {
85 IP ret = 0;
86
87 while ((*s >= '0') && (*s <= '9')) {
88 ret *= 10;
89 ret += ((*s) - '0');
90 s++;
91 }
92 return ret;
93 }
94
95 int expmem_net()
96 {
97 int i, tot = 0;
98 struct threaddata *td = threaddata();
99
100 for (i = 0; i < td->MAXSOCKS; i++) {
101 if (!(td->socklist[i].flags & (SOCK_UNUSED | SOCK_TCL))) {
102 if (td->socklist[i].handler.sock.inbuf != NULL)
103 tot += strlen(td->socklist[i].handler.sock.inbuf) + 1;
104 if (td->socklist[i].handler.sock.outbuf != NULL)
105 tot += td->socklist[i].handler.sock.outbuflen;
106 }
107 }
108 return tot;
109 }
110
111 /* Extract the IP address from a sockaddr struct and convert it
112 * to presentation format.
113 */
114 char *iptostr(struct sockaddr *sa)
115 {
116 #ifdef IPV6
117 static char s[INET6_ADDRSTRLEN] = "";
118 if (sa->sa_family == AF_INET6)
119 inet_ntop(AF_INET6, &((struct sockaddr_in6 *)sa)->sin6_addr,
120 s, sizeof s);
121 else
122 #else
123 static char s[sizeof "255.255.255.255"] = "";
124 #endif
125 inet_ntop(AF_INET, &((struct sockaddr_in *)sa)->sin_addr.s_addr, s,
126 sizeof s);
127 return s;
128 }
129
130 /* Fills in a sockname struct with the given server and port. If the string
131 * pointed by src isn't an IP address and allowres is not null, the function
132 * will assume it's a hostname and will attempt to resolve it. This is
133 * convenient, but you should use the async dns functions where possible, to
134 * avoid blocking the bot while the lookup is performed.
135 */
136 int setsockname(sockname_t *addr, char *src, int port, int allowres)
137 {
138 struct hostent *hp;
139 int af = AF_UNSPEC;
140 #ifdef IPV6
141 int pref;
142
143 /* Clean start */
144 egg_bzero(addr, sizeof(sockname_t));
145 af = pref = pref_af ? AF_INET6 : AF_INET;
146 if (pref == AF_INET) {
147 if (!egg_inet_aton(src, &addr->addr.s4.sin_addr))
148 af = AF_INET6;
149 } else {
150 if (inet_pton(af, src, &addr->addr.s6.sin6_addr) != 1)
151 af = AF_INET;
152 }
153 if (af != pref)
154 if (((af == AF_INET6) &&
155 (inet_pton(af, src, &addr->addr.s6.sin6_addr) != 1)) ||
156 ((af == AF_INET) &&
157 !egg_inet_aton(src, &addr->addr.s4.sin_addr)))
158 af = AF_UNSPEC;
159
160 if (af == AF_UNSPEC && allowres) {
161 /* src is a hostname. Attempt to resolve it.. */
162 if (!sigsetjmp(alarmret, 1)) {
163 alarm(resolve_timeout);
164 hp = gethostbyname2(src, pref_af ? AF_INET6 : AF_INET);
165 if (!hp)
166 hp = gethostbyname2(src, pref_af ? AF_INET : AF_INET6);
167 alarm(0);
168 } else
169 hp = NULL;
170 if (hp) {
171 if (hp->h_addrtype == AF_INET)
172 egg_memcpy(&addr->addr.s4.sin_addr, hp->h_addr, hp->h_length);
173 else
174 egg_memcpy(&addr->addr.s6.sin6_addr, hp->h_addr, hp->h_length);
175 af = hp->h_addrtype;
176 }
177 }
178
179 addr->family = (af == AF_UNSPEC) ? pref : af;
180 addr->addr.sa.sa_family = addr->family;
181 if (addr->family == AF_INET6) {
182 addr->addrlen = sizeof(struct sockaddr_in6);
183 addr->addr.s6.sin6_port = htons(port);
184 addr->addr.s6.sin6_family = AF_INET6;
185 } else {
186 addr->addrlen = sizeof(struct sockaddr_in);
187 addr->addr.s4.sin_port = htons(port);
188 addr->addr.s4.sin_family = AF_INET;
189 }
190 #else
191 egg_bzero(addr, sizeof(sockname_t));
192 if (!egg_inet_aton(src, &addr->addr.s4.sin_addr) && allowres) {
193 /* src is a hostname. Attempt to resolve it.. */
194 if (!sigsetjmp(alarmret, 1)) {
195 alarm(resolve_timeout);
196 hp = gethostbyname(src);
197 alarm(0);
198 } else
199 hp = NULL;
200 if (hp) {
201 egg_memcpy(&addr->addr.s4.sin_addr, hp->h_addr, hp->h_length);
202 af = hp->h_addrtype;
203 }
204 }
205
206 addr->family = addr->addr.s4.sin_family = AF_INET;
207 addr->addr.sa.sa_family = addr->family;
208 addr->addrlen = sizeof(struct sockaddr_in);
209 addr->addr.s4.sin_port = htons(port);
210 #endif
211 return af;
212 }
213
214 /* Get socket address to bind to for outbound connections
215 */
216 void getvhost(sockname_t *addr, int af)
217 {
218 char *h;
219
220 if (af == AF_INET)
221 h = vhost;
222 #ifdef IPV6
223 else
224 h = vhost6;
225 #endif
226 if (setsockname(addr, h, 0, 1) != af)
227 setsockname(addr, (af == AF_INET ? "0" : "::"), 0, 0);
228 /* Remember this 'self-lookup failed' thingie?
229 I have good news - you won't see it again ;) */
230 }
231
232 /* Sets/Unsets options for a specific socket.
233 *
234 * Returns: 0 - on success
235 * -1 - socket not found
236 * -2 - illegal operation
237 */
238 int sockoptions(int sock, int operation, int sock_options)
239 {
240 int i;
241 struct threaddata *td = threaddata();
242
243 for (i = 0; i < td->MAXSOCKS; i++)
244 if ((td->socklist[i].sock == sock) &&
245 !(td->socklist[i].flags & SOCK_UNUSED)) {
246 if (operation == EGG_OPTION_SET)
247 td->socklist[i].flags |= sock_options;
248 else if (operation == EGG_OPTION_UNSET)
249 td->socklist[i].flags &= ~sock_options;
250 else
251 return -2;
252 return 0;
253 }
254 return -1;
255 }
256
257 /* Return a free entry in the socket entry
258 */
259 int allocsock(int sock, int options)
260 {
261 int i;
262 struct threaddata *td = threaddata();
263
264 for (i = 0; i < td->MAXSOCKS; i++) {
265 if (td->socklist[i].flags & SOCK_UNUSED) {
266 /* yay! there is table space */
267 td->socklist[i].handler.sock.inbuf = NULL;
268 td->socklist[i].handler.sock.outbuf = NULL;
269 td->socklist[i].handler.sock.inbuflen = 0;
270 td->socklist[i].handler.sock.outbuflen = 0;
271 td->socklist[i].flags = options;
272 td->socklist[i].sock = sock;
273 return i;
274 }
275 }
276 /* Try again if enlarging socketlist works */
277 if (increase_socks_max())
278 return -1;
279 else
280 return allocsock(sock, options);
281 }
282
283 /* Return a free entry in the socket entry for a tcl socket
284 *
285 * alloctclsock() can be called by Tcl threads
286 */
287 int alloctclsock(register int sock, int mask, Tcl_FileProc *proc, ClientData cd)
288 {
289 int f = -1;
290 register int i;
291 struct threaddata *td = threaddata();
292
293 for (i = 0; i < td->MAXSOCKS; i++) {
294 if (td->socklist[i].flags & SOCK_UNUSED) {
295 if (f == -1)
296 f = i;
297 } else if ((td->socklist[i].flags & SOCK_TCL) &&
298 td->socklist[i].sock == sock) {
299 f = i;
300 break;
301 }
302 }
303 if (f != -1) {
304 td->socklist[f].sock = sock;
305 td->socklist[f].flags = SOCK_TCL;
306 td->socklist[f].handler.tclsock.mask = mask;
307 td->socklist[f].handler.tclsock.proc = proc;
308 td->socklist[f].handler.tclsock.cd = cd;
309 return f;
310 }
311 /* Try again if enlarging socketlist works */
312 if (increase_socks_max())
313 return -1;
314 else
315 return alloctclsock(sock, mask, proc, cd);
316 }
317
318 /* Request a normal socket for i/o
319 */
320 void setsock(int sock, int options)
321 {
322 int i = allocsock(sock, options), parm;
323 struct threaddata *td = threaddata();
324
325 if (i == -1) {
326 putlog(LOG_MISC, "*", "Sockettable full.");
327 return;
328 }
329 if (((sock != STDOUT) || backgrd) && !(td->socklist[i].flags & SOCK_NONSOCK)) {
330 parm = 1;
331 setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (void *) &parm, sizeof(int));
332
333 parm = 0;
334 setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *) &parm, sizeof(int));
335 }
336 if (options & SOCK_LISTEN) {
337 /* Tris says this lets us grab the same port again next time */
338 parm = 1;
339 setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *) &parm, sizeof(int));
340 }
341 /* Yay async i/o ! */
342 fcntl(sock, F_SETFL, O_NONBLOCK);
343 }
344
345 int getsock(int af, int options)
346 {
347 int sock = socket(af, SOCK_STREAM, 0);
348
349 if (sock >= 0)
350 setsock(sock, options);
351 else
352 putlog(LOG_MISC, "*", "Warning: Can't create new socket: %s!",
353 strerror(errno));
354 return sock;
355 }
356
357 /* Done with a socket
358 */
359 void killsock(register int sock)
360 {
361 register int i;
362 struct threaddata *td = threaddata();
363
364 /* Ignore invalid sockets. */
365 if (sock < 0)
366 return;
367
368 for (i = 0; i < td->MAXSOCKS; i++) {
369 if ((td->socklist[i].sock == sock) && !(td->socklist[i].flags & SOCK_UNUSED)) {
370 if (!(td->socklist[i].flags & SOCK_TCL)) { /* nothing to free for tclsocks */
371 close(td->socklist[i].sock);
372 if (td->socklist[i].handler.sock.inbuf != NULL) {
373 nfree(td->socklist[i].handler.sock.inbuf);
374 td->socklist[i].handler.sock.inbuf = NULL;
375 }
376 if (td->socklist[i].handler.sock.outbuf != NULL) {
377 nfree(td->socklist[i].handler.sock.outbuf);
378 td->socklist[i].handler.sock.outbuf = NULL;
379 td->socklist[i].handler.sock.outbuflen = 0;
380 }
381 }
382 td->socklist[i].flags = SOCK_UNUSED;
383 return;
384 }
385 }
386 putlog(LOG_MISC, "*", "Warning: Attempt to kill un-allocated socket %d!", sock);
387 }
388
389 /* Done with a tcl socket
390 *
391 * killtclsock() can be called by Tcl threads
392 */
393 void killtclsock(register int sock)
394 {
395 register int i;
396 struct threaddata *td = threaddata();
397
398 if (sock < 0)
399 return;
400
401 for (i = 0; i < td->MAXSOCKS; i++) {
402 if ((td->socklist[i].flags & SOCK_TCL) && td->socklist[i].sock == sock) {
403 td->socklist[i].flags = SOCK_UNUSED;
404 return;
405 }
406 }
407 }
408
409 /* Send connection request to proxy
410 */
411 static int proxy_connect(int sock, sockname_t *addr)
412 {
413 sockname_t name;
414 char host[121], s[256];
415 int i, port, proxy;
416
417 if (!firewall[0])
418 return -2;
419 #ifdef IPV6
420 if (addr->family == AF_INET6) {
421 putlog(LOG_MISC, "*", "Eggdrop doesn't support IPv6 connections "
422 "through proxies yet.");
423 return -1;
424 }
425 #endif
426 if (firewall[0] == '!') {
427 proxy = PROXY_SUN;
428 strcpy(host, &firewall[1]);
429 } else {
430 proxy = PROXY_SOCKS;
431 strcpy(host, firewall);
432 }
433 port = addr->addr.s4.sin_port;
434 setsockname(&name, host, firewallport, 1);
435 if (connect(sock, &name.addr.sa, name.addrlen) < 0 && errno != EINPROGRESS)
436 return -1;
437 if (proxy == PROXY_SOCKS) {
438 for (i = 0; i < threaddata()->MAXSOCKS; i++)
439 if (!(socklist[i].flags & SOCK_UNUSED) && socklist[i].sock == sock)
440 socklist[i].flags |= SOCK_PROXYWAIT; /* drummer */
441 egg_memcpy(host, &addr->addr.s4.sin_addr.s_addr, 4);
442 egg_snprintf(s, sizeof s, "\004\001%c%c%c%c%c%c%s", port % 256,
443 (port >> 8) % 256, host[0], host[1], host[2], host[3], botuser);
444 tputs(sock, s, strlen(botuser) + 9); /* drummer */
445 } else if (proxy == PROXY_SUN) {
446 inet_ntop(AF_INET, &addr->addr.s4.sin_addr, host, sizeof host);
447 egg_snprintf(s, sizeof s, "%s %d\n", host, port);
448 tputs(sock, s, strlen(s)); /* drummer */
449 }
450 return sock;
451 }
452
453 /* Starts a connection attempt through a socket
454 *
455 * The server address should be filled in addr by setsockname() or by the
456 * non-blocking dns functions and setsnport().
457 *
458 * returns < 0 if connection refused:
459 * -1 strerror() type error
460 */
461 int open_telnet_raw(int sock, sockname_t *addr)
462 {
463 sockname_t name;
464 int i, rc;
465
466 getvhost(&name, addr->family);
467 if (bind(sock, &name.addr.sa, name.addrlen) < 0) {
468 return -1;
469 }
470 for (i = 0; i < threaddata()->MAXSOCKS; i++) {
471 if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].sock == sock))
472 socklist[i].flags = (socklist[i].flags & ~SOCK_VIRTUAL) | SOCK_CONNECT;
473 }
474 if (addr->family == AF_INET && firewall[0])
475 return proxy_connect(sock, addr);
476 rc = connect(sock, &addr->addr.sa, addr->addrlen);
477 if (rc < 0) {
478 if (errno == EINPROGRESS)
479 return sock; /* async success! */
480 else
481 return -1;
482 }
483 return sock;
484 }
485
486 /* Ordinary non-binary connection attempt
487 * Return values:
488 * >=0: connect successful, returned is the socket number
489 * -1: look at errno or use strerror()
490 * -2: lookup failed or server is not a valid IP string
491 */
492 int open_telnet(char *server, int port)
493 {
494 int ret, sock;
495 sockname_t name;
496
497 ret = setsockname(&name, server, port, 1);
498 if (ret == AF_UNSPEC)
499 return -2;
500 sock = getsock(ret, 0);
501 if (sock < 0)
502 return -1;
503 ret = open_telnet_raw(sock, &name);
504 if (ret < 0)
505 killsock(sock);
506 return ret;
507 }
508
509 /* Returns a socket number for a listening socket that will accept any
510 * connection on the given address. The address can be filled in by
511 * setsockname().
512 */
513 int open_address_listen(sockname_t *addr)
514 {
515 int sock = 0;
516
517 sock = getsock(addr->family, SOCK_LISTEN);
518 if (sock < 0)
519 return -1;
520 #if defined IPV6 && IPV6_V6ONLY
521 if (addr->family == AF_INET6) {
522 int on = 0;
523 setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, (char *) &on, sizeof(on));
524 }
525 #endif
526 if (bind(sock, &addr->addr.sa, addr->addrlen) < 0) {
527 killsock(sock);
528 return -2;
529 }
530
531 if (getsockname(sock, &addr->addr.sa, &addr->addrlen) < 0) {
532 killsock(sock);
533 return -1;
534 }
535 if (listen(sock, 1) < 0) {
536 killsock(sock);
537 return -1;
538 }
539
540 return sock;
541 }
542
543 /* Returns a socket number for a listening socket that will accept any
544 * connection -- port # is returned in port
545 */
546 inline int open_listen(int *port)
547 {
548 int sock;
549 sockname_t name;
550
551 (void) setsockname(&name, listen_ip, *port, 1);
552 sock = open_address_listen(&name);
553 if (name.addr.sa.sa_family == AF_INET)
554 *port = ntohs(name.addr.s4.sin_port);
555 #ifdef IPV6
556 else
557 *port = ntohs(name.addr.s6.sin6_port);
558 #endif
559 return sock;
560 }
561
562 /* Short routine to answer a connect received on a listening socket.
563 * Returned is the new socket.
564 * If port is not NULL, it points to an integer to hold the port number
565 * of the caller.
566 */
567 int answer(int sock, sockname_t *caller, unsigned short *port, int binary)
568 {
569 int new_sock;
570 caller->addrlen = sizeof(caller->addr);
571 new_sock = accept(sock, &caller->addr.sa, &caller->addrlen);
572
573 if (new_sock < 0)
574 return -1;
575
576 caller->family = caller->addr.sa.sa_family;
577 if (port) {
578 if (caller->family == AF_INET)
579 *port = ntohs(caller->addr.s4.sin_port);
580 #ifdef IPV6
581 else
582 *port = ntohs(caller->addr.s6.sin6_port);
583 #endif
584 }
585 setsock(new_sock, (binary ? SOCK_BINARY : 0));
586 return new_sock;
587 }
588
589 /* Get DCC compatible address for a client to connect (e.g. 1660944385)
590 * If addr is not NULL, it should point to the listening socket's address.
591 * Otherwise, this function will try to figure out the public address of the
592 * machine, using listen_ip and natip.
593 * The result is a string useable for DCC requests
594 */
595 int getdccaddr(sockname_t *addr, char *s, size_t l)
596 {
597 char h[121];
598 sockname_t name, *r = &name;
599
600 if (addr)
601 r = addr;
602 else
603 setsockname(r, listen_ip, 0, 1);
604 if (
605 #ifdef IPV6
606 ((r->family == AF_INET6) &&
607 IN6_IS_ADDR_UNSPECIFIED(&r->addr.s6.sin6_addr)) ||
608 #endif
609 (r->family == AF_INET && !r->addr.s4.sin_addr.s_addr)) {
610 /* We can't send :: or 0.0.0.0 for dcc, so try
611 to figure out some real address */
612 r = &name;
613 gethostname(h, sizeof h);
614 setsockname(r, h, 0, 1);
615 }
616
617 if (
618 #ifdef IPV6
619 ((r->family == AF_INET6) &&
620 IN6_IS_ADDR_UNSPECIFIED(&r->addr.s6.sin6_addr)) ||
621 #endif
622 (!natip[0] && (r->family == AF_INET) && !r->addr.s4.sin_addr.s_addr))
623 return 0;
624
625 #ifdef IPV6
626 if (r->family == AF_INET6) {
627 if (IN6_IS_ADDR_V4MAPPED(&r->addr.s6.sin6_addr) ||
628 IN6_IS_ADDR_UNSPECIFIED(&r->addr.s6.sin6_addr))
629 snprintf(s, l, "%lu", natip[0] ? iptolong(inet_addr(natip)) :
630 ntohl(*(IP *) &r->addr.s6.sin6_addr.s6_addr[12]));
631 else
632 inet_ntop(AF_INET6, &r->addr.s6.sin6_addr, s, l);
633 } else
634 #endif
635 snprintf(s, l, "%lu", natip[0] ? iptolong(inet_addr(natip)) :
636 ntohl(r->addr.s4.sin_addr.s_addr));
637 return 1;
638 }
639
640 /* Builds the fd_sets for select(). Eggdrop only cares about readable
641 * sockets, but tcl also cares for writable/exceptions.
642 * preparefdset() can be called by Tcl Threads
643 */
644 int preparefdset(fd_set *fd, sock_list *slist, int slistmax, int tclonly, int tclmask)
645 {
646 int fdtmp, i, foundsocks = 0;
647
648 FD_ZERO(fd);
649 for (i = 0; i < slistmax; i++) {
650 if (!(slist[i].flags & (SOCK_UNUSED | SOCK_VIRTUAL))) {
651 if ((slist[i].sock == STDOUT) && !backgrd)
652 fdtmp = STDIN;
653 else
654 fdtmp = slist[i].sock;
655 /*
656 * Looks like that having more than a call, in the same
657 * program, to the FD_SET macro, triggers a bug in gcc.
658 * SIGBUS crashing binaries used to be produced on a number
659 * (prolly all?) of 64 bits architectures.
660 * Make your best to avoid to make it happen again.
661 *
662 * ITE
663 */
664 if (slist[i].flags & SOCK_TCL) {
665 if (!(slist[i].handler.tclsock.mask & tclmask))
666 continue;
667 } else if (tclonly)
668 continue;
669 foundsocks = 1;
670 FD_SET(fdtmp, fd);
671 }
672 }
673 return foundsocks;
674 }
675
676 /* Attempts to read from all sockets in slist (upper array boundary slistmax-1)
677 * fills s with up to 511 bytes if available, and returns the array index
678 * Also calls all handler procs for Tcl sockets
679 * sockread() can be called by Tcl threads
680 *
681 * on EOF: returns -1, with socket in len
682 * on socket error: returns -2
683 * if nothing is ready: returns -3
684 * tcl sockets busy: returns -5
685 */
686 int sockread(char *s, int *len, sock_list *slist, int slistmax, int tclonly)
687 {
688 struct timeval t;
689 fd_set fdr, fdw, fde;
690 int fds, i, x, have_r, have_w, have_e;
691 int grab = 511, tclsock = -1, events = 0;
692 struct threaddata *td = threaddata();
693
694 fds = getdtablesize();
695 #ifdef FD_SETSIZE
696 if (fds > FD_SETSIZE)
697 fds = FD_SETSIZE; /* Fixes YET ANOTHER freebsd bug!!! */
698 #endif
699
700 have_r = preparefdset(&fdr, slist, slistmax, tclonly, TCL_READABLE);
701 have_w = preparefdset(&fdw, slist, slistmax, 1, TCL_WRITABLE);
702 have_e = preparefdset(&fde, slist, slistmax, 1, TCL_EXCEPTION);
703
704 /* select() may modify the timeval argument - copy it */
705 t.tv_sec = td->blocktime.tv_sec;
706 t.tv_usec = td->blocktime.tv_usec;
707
708 x = select((SELECT_TYPE_ARG1) fds,
709 SELECT_TYPE_ARG234 (have_r ? &fdr : NULL),
710 SELECT_TYPE_ARG234 (have_w ? &fdw : NULL),
711 SELECT_TYPE_ARG234 (have_e ? &fde : NULL),
712 SELECT_TYPE_ARG5 &t);
713 if (x > 0) {
714 /* Something happened */
715 for (i = 0; i < slistmax; i++) {
716 if (!tclonly && ((!(slist[i].flags & (SOCK_UNUSED | SOCK_TCL))) &&
717 ((FD_ISSET(slist[i].sock, &fdr)) ||
718 ((slist[i].sock == STDOUT) && (!backgrd) &&
719 (FD_ISSET(STDIN, &fdr)))))) {
720 if (slist[i].flags & (SOCK_LISTEN | SOCK_CONNECT)) {
721 /* Listening socket -- don't read, just return activity */
722 /* Same for connection attempt */
723 /* (for strong connections, require a read to succeed first) */
724 if (slist[i].flags & SOCK_PROXYWAIT) /* drummer */
725 /* Hang around to get the return code from proxy */
726 grab = 10;
727 else if (!(slist[i].flags & SOCK_STRONGCONN)) {
728 debug1("net: connect! sock %d", slist[i].sock);
729 s[0] = 0;
730 *len = 0;
731 return i;
732 }
733 } else if (slist[i].flags & SOCK_PASS) {
734 s[0] = 0;
735 *len = 0;
736 return i;
737 }
738 errno = 0;
739 if ((slist[i].sock == STDOUT) && !backgrd)
740 x = read(STDIN, s, grab);
741 else
742 x = read(slist[i].sock, s, grab);
743 if (x <= 0) { /* eof */
744 if (errno != EAGAIN) { /* EAGAIN happens when the operation would
745 * block on a non-blocking socket, if the
746 * socket is going to die, it will die later,
747 * otherwise it will connect. */
748 *len = slist[i].sock;
749 slist[i].flags &= ~SOCK_CONNECT;
750 debug1("net: eof!(read) socket %d", slist[i].sock);
751 return -1;
752 } else {
753 debug3("sockread EAGAIN: %d %d (%s)", slist[i].sock, errno,
754 strerror(errno));
755 continue; /* EAGAIN */
756 }
757 }
758 s[x] = 0;
759 *len = x;
760 if (slist[i].flags & SOCK_PROXYWAIT) {
761 debug2("net: socket: %d proxy errno: %d", slist[i].sock, s[1]);
762 slist[i].flags &= ~(SOCK_CONNECT | SOCK_PROXYWAIT);
763 switch (s[1]) {
764 case 90: /* Success */
765 s[0] = 0;
766 *len = 0;
767 return i;
768 case 91: /* Failed */
769 errno = ECONNREFUSED;
770 break;
771 case 92: /* No identd */
772 case 93: /* Identd said wrong username */
773 /* A better error message would be "socks misconfigured"
774 * or "identd not working" but this is simplest.
775 */
776 errno = ENETUNREACH;
777 break;
778 }
779 *len = slist[i].sock;
780 return -1;
781 }
782 return i;
783 } else if (tclsock == -1 && (slist[i].flags & SOCK_TCL)) {
784 events = FD_ISSET(slist[i].sock, &fdr) ? TCL_READABLE : 0;
785 events |= FD_ISSET(slist[i].sock, &fdw) ? TCL_WRITABLE : 0;
786 events |= FD_ISSET(slist[i].sock, &fde) ? TCL_EXCEPTION : 0;
787 events &= slist[i].handler.tclsock.mask;
788 if (events)
789 tclsock = i;
790 }
791 }
792 } else if (x == -1)
793 return -2; /* socket error */
794 else if (!tclonly) {
795 s[0] = 0;
796 *len = 0;
797 }
798 if (tclsock != -1) {
799 (*slist[tclsock].handler.tclsock.proc)(slist[tclsock].handler.tclsock.cd,
800 events);
801 return -5;
802 }
803 return -3;
804 }
805
806 /* sockgets: buffer and read from sockets
807 *
808 * Attempts to read from all registered sockets for up to one second. if
809 * after one second, no complete data has been received from any of the
810 * sockets, 's' will be empty, 'len' will be 0, and sockgets will return -3.
811 * if there is returnable data received from a socket, the data will be
812 * in 's' (null-terminated if non-binary), the length will be returned
813 * in len, and the socket number will be returned.
814 * normal sockets have their input buffered, and each call to sockgets
815 * will return one line terminated with a '\n'. binary sockets are not
816 * buffered and return whatever coems in as soon as it arrives.
817 * listening sockets will return an empty string when a connection comes in.
818 * connecting sockets will return an empty string on a successful connect,
819 * or EOF on a failed connect.
820 * if an EOF is detected from any of the sockets, that socket number will be
821 * put in len, and -1 will be returned.
822 * the maximum length of the string returned is 512 (including null)
823 *
824 * Returns -4 if we handled something that shouldn't be handled by the
825 * dcc functions. Simply ignore it.
826 * Returns -5 if tcl sockets are busy but not eggdrop sockets.
827 */
828
829 int sockgets(char *s, int *len)
830 {
831 char xx[514], *p, *px;
832 int ret, i, data = 0;
833
834 for (i = 0; i < threaddata()->MAXSOCKS; i++) {
835 /* Check for stored-up data waiting to be processed */
836 if (!(socklist[i].flags & (SOCK_UNUSED | SOCK_TCL | SOCK_BUFFER)) &&
837 (socklist[i].handler.sock.inbuf != NULL)) {
838 if (!(socklist[i].flags & SOCK_BINARY)) {
839 /* look for \r too cos windows can't follow RFCs */
840 p = strchr(socklist[i].handler.sock.inbuf, '\n');
841 if (p == NULL)
842 p = strchr(socklist[i].handler.sock.inbuf, '\r');
843 if (p != NULL) {
844 *p = 0;
845 if (strlen(socklist[i].handler.sock.inbuf) > 510)
846 socklist[i].handler.sock.inbuf[510] = 0;
847 strcpy(s, socklist[i].handler.sock.inbuf);
848 px = nmalloc(strlen(p + 1) + 1);
849 strcpy(px, p + 1);
850 nfree(socklist[i].handler.sock.inbuf);
851 if (px[0])
852 socklist[i].handler.sock.inbuf = px;
853 else {
854 nfree(px);
855 socklist[i].handler.sock.inbuf = NULL;
856 }
857 /* Strip CR if this was CR/LF combo */
858 if (s[strlen(s) - 1] == '\r')
859 s[strlen(s) - 1] = 0;
860 *len = strlen(s);
861 return socklist[i].sock;
862 }
863 } else {
864 /* Handling buffered binary data (must have been SOCK_BUFFER before). */
865 if (socklist[i].handler.sock.inbuflen <= 510) {
866 *len = socklist[i].handler.sock.inbuflen;
867 egg_memcpy(s, socklist[i].handler.sock.inbuf, socklist[i].handler.sock.inbuflen);
868 nfree(socklist[i].handler.sock.inbuf);
869 socklist[i].handler.sock.inbuf = NULL;
870 socklist[i].handler.sock.inbuflen = 0;
871 } else {
872 /* Split up into chunks of 510 bytes. */
873 *len = 510;
874 egg_memcpy(s, socklist[i].handler.sock.inbuf, *len);
875 egg_memcpy(socklist[i].handler.sock.inbuf, socklist[i].handler.sock.inbuf + *len, *len);
876 socklist[i].handler.sock.inbuflen -= *len;
877 socklist[i].handler.sock.inbuf = nrealloc(socklist[i].handler.sock.inbuf, socklist[i].handler.sock.inbuflen);
878 }
879 return socklist[i].sock;
880 }
881 }
882 /* Also check any sockets that might have EOF'd during write */
883 if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].flags & SOCK_EOFD)) {
884 s[0] = 0;
885 *len = socklist[i].sock;
886 return -1;
887 }
888 }
889 /* No pent-up data of any worth -- down to business */
890 *len = 0;
891 ret = sockread(xx, len, socklist, threaddata()->MAXSOCKS, 0);
892 if (ret < 0) {
893 s[0] = 0;
894 return ret;
895 }
896 /* Binary, listening and passed on sockets don't get buffered. */
897 if (socklist[ret].flags & SOCK_CONNECT) {
898 if (socklist[ret].flags & SOCK_STRONGCONN) {
899 socklist[ret].flags &= ~SOCK_STRONGCONN;
900 /* Buffer any data that came in, for future read. */
901 socklist[ret].handler.sock.inbuflen = *len;
902 socklist[ret].handler.sock.inbuf = nmalloc(*len + 1);
903 /* It might be binary data. You never know. */
904 egg_memcpy(socklist[ret].handler.sock.inbuf, xx, *len);
905 socklist[ret].handler.sock.inbuf[*len] = 0;
906 }
907 socklist[ret].flags &= ~SOCK_CONNECT;
908 s[0] = 0;
909 return socklist[ret].sock;
910 }
911 if (socklist[ret].flags & SOCK_BINARY) {
912 egg_memcpy(s, xx, *len);
913 return socklist[ret].sock;
914 }
915 if (socklist[ret].flags & (SOCK_LISTEN | SOCK_PASS | SOCK_TCL)) {
916 s[0] = 0; /* for the dcc traffic counters in the mainloop */
917 return socklist[ret].sock;
918 }
919 if (socklist[ret].flags & SOCK_BUFFER) {
920 socklist[ret].handler.sock.inbuf = (char *) nrealloc(socklist[ret].handler.sock.inbuf,
921 socklist[ret].handler.sock.inbuflen + *len + 1);
922 egg_memcpy(socklist[ret].handler.sock.inbuf + socklist[ret].handler.sock.inbuflen, xx, *len);
923 socklist[ret].handler.sock.inbuflen += *len;
924 /* We don't know whether it's binary data. Make sure normal strings
925 * will be handled properly later on too. */
926 socklist[ret].handler.sock.inbuf[socklist[ret].handler.sock.inbuflen] = 0;
927 return -4; /* Ignore this one. */
928 }
929 /* Might be necessary to prepend stored-up data! */
930 if (socklist[ret].handler.sock.inbuf != NULL) {
931 p = socklist[ret].handler.sock.inbuf;
932 socklist[ret].handler.sock.inbuf = nmalloc(strlen(p) + strlen(xx) + 1);
933 strcpy(socklist[ret].handler.sock.inbuf, p);
934 strcat(socklist[ret].handler.sock.inbuf, xx);
935 nfree(p);
936 if (strlen(socklist[ret].handler.sock.inbuf) < 512) {
937 strcpy(xx, socklist[ret].handler.sock.inbuf);
938 nfree(socklist[ret].handler.sock.inbuf);
939 socklist[ret].handler.sock.inbuf = NULL;
940 socklist[ret].handler.sock.inbuflen = 0;
941 } else {
942 p = socklist[ret].handler.sock.inbuf;
943 socklist[ret].handler.sock.inbuflen = strlen(p) - 510;
944 socklist[ret].handler.sock.inbuf = nmalloc(socklist[ret].handler.sock.inbuflen + 1);
945 strcpy(socklist[ret].handler.sock.inbuf, p + 510);
946 *(p + 510) = 0;
947 strcpy(xx, p);
948 nfree(p);
949 /* (leave the rest to be post-pended later) */
950 }
951 }
952 /* Look for EOL marker; if it's there, i have something to show */
953 p = strchr(xx, '\n');
954 if (p == NULL)
955 p = strchr(xx, '\r');
956 if (p != NULL) {
957 *p = 0;
958 strcpy(s, xx);
959 memmove(xx, p + 1, strlen(p + 1) + 1);
960 if (s[strlen(s) - 1] == '\r')
961 s[strlen(s) - 1] = 0;
962 data = 1; /* DCC_CHAT may now need to process a blank line */
963 /* NO! */
964 /* if (!s[0]) strcpy(s," "); */
965 } else {
966 s[0] = 0;
967 if (strlen(xx) >= 510) {
968 /* String is too long, so just insert fake \n */
969 strcpy(s, xx);
970 xx[0] = 0;
971 data = 1;
972 }
973 }
974 *len = strlen(s);
975 /* Anything left that needs to be saved? */
976 if (!xx[0]) {
977 if (data)
978 return socklist[ret].sock;
979 else
980 return -3;
981 }
982 /* Prepend old data back */
983 if (socklist[ret].handler.sock.inbuf != NULL) {
984 p = socklist[ret].handler.sock.inbuf;
985 socklist[ret].handler.sock.inbuflen = strlen(p) + strlen(xx);
986 socklist[ret].handler.sock.inbuf = nmalloc(socklist[ret].handler.sock.inbuflen + 1);
987 strcpy(socklist[ret].handler.sock.inbuf, xx);
988 strcat(socklist[ret].handler.sock.inbuf, p);
989 nfree(p);
990 } else {
991 socklist[ret].handler.sock.inbuflen = strlen(xx);
992 socklist[ret].handler.sock.inbuf = nmalloc(socklist[ret].handler.sock.inbuflen + 1);
993 strcpy(socklist[ret].handler.sock.inbuf, xx);
994 }
995 if (data)
996 return socklist[ret].sock;
997 else
998 return -3;
999 }
1000
1001 /* Dump something to a socket
1002 *
1003 * NOTE: Do NOT put Contexts in here if you want DEBUG to be meaningful!!
1004 */
1005 void tputs(register int z, char *s, unsigned int len)
1006 {
1007 register int i, x, idx;
1008 char *p;
1009 static int inhere = 0;
1010
1011 if (z < 0) /* um... HELLO?! sanity check please! */
1012 return;
1013
1014 if (((z == STDOUT) || (z == STDERR)) && (!backgrd || use_stderr)) {
1015 write(z, s, len);
1016 return;
1017 }
1018
1019 for (i = 0; i < threaddata()->MAXSOCKS; i++) {
1020 if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].sock == z)) {
1021 for (idx = 0; idx < dcc_total; idx++) {
1022 if ((dcc[idx].sock == z) && dcc[idx].type && dcc[idx].type->name) {
1023 if (!strncmp(dcc[idx].type->name, "BOT", 3))
1024 otraffic_bn_today += len;
1025 else if (!strcmp(dcc[idx].type->name, "SERVER"))
1026 otraffic_irc_today += len;
1027 else if (!strncmp(dcc[idx].type->name, "CHAT", 4))
1028 otraffic_dcc_today += len;
1029 else if (!strncmp(dcc[idx].type->name, "FILES", 5))
1030 otraffic_filesys_today += len;
1031 else if (!strcmp(dcc[idx].type->name, "SEND"))
1032 otraffic_trans_today += len;
1033 else if (!strncmp(dcc[idx].type->name, "GET", 3))
1034 otraffic_trans_today += len;
1035 else
1036 otraffic_unknown_today += len;
1037 break;
1038 }
1039 }
1040
1041 if (socklist[i].handler.sock.outbuf != NULL) {
1042 /* Already queueing: just add it */
1043 p = (char *) nrealloc(socklist[i].handler.sock.outbuf, socklist[i].handler.sock.outbuflen + len);
1044 egg_memcpy(p + socklist[i].handler.sock.outbuflen, s, len);
1045 socklist[i].handler.sock.outbuf = p;
1046 socklist[i].handler.sock.outbuflen += len;
1047 return;
1048 }
1049 /* Try. */
1050 x = write(z, s, len);
1051 if (x == -1)
1052 x = 0;
1053 if (x < len) {
1054 /* Socket is full, queue it */
1055 socklist[i].handler.sock.outbuf = nmalloc(len - x);
1056 egg_memcpy(socklist[i].handler.sock.outbuf, &s[x], len - x);
1057 socklist[i].handler.sock.outbuflen = len - x;
1058 }
1059 return;
1060 }
1061 }
1062 /* Make sure we don't cause a crash by looping here */
1063 if (!inhere) {
1064 inhere = 1;
1065
1066 putlog(LOG_MISC, "*", "!!! writing to nonexistent socket: %d", z);
1067 s[strlen(s) - 1] = 0;
1068 putlog(LOG_MISC, "*", "!-> '%s'", s);
1069
1070 inhere = 0;
1071 }
1072 }
1073
1074 /* tputs might queue data for sockets, let's dump as much of it as
1075 * possible.
1076 */
1077 void dequeue_sockets()
1078 {
1079 int i, x;
1080
1081 int z = 0, fds;
1082 fd_set wfds;
1083 struct timeval tv;
1084
1085 /* ^-- start poptix test code, this should avoid writes to sockets not ready to be written to. */
1086 fds = getdtablesize();
1087
1088 #ifdef FD_SETSIZE
1089 if (fds > FD_SETSIZE)
1090 fds = FD_SETSIZE; /* Fixes YET ANOTHER freebsd bug!!! */
1091 #endif
1092 FD_ZERO(&wfds);
1093 tv.tv_sec = 0;
1094 tv.tv_usec = 0; /* we only want to see if it's ready for writing, no need to actually wait.. */
1095 for (i = 0; i < threaddata()->MAXSOCKS; i++) {
1096 if (!(socklist[i].flags & (SOCK_UNUSED | SOCK_TCL)) &&
1097 socklist[i].handler.sock.outbuf != NULL) {
1098 FD_SET(socklist[i].sock, &wfds);
1099 z = 1;
1100 }
1101 }
1102 if (!z)
1103 return; /* nothing to write */
1104
1105 select((SELECT_TYPE_ARG1) fds, SELECT_TYPE_ARG234 NULL,
1106 SELECT_TYPE_ARG234 &wfds, SELECT_TYPE_ARG234 NULL,
1107 SELECT_TYPE_ARG5 &tv);
1108
1109 /* end poptix */
1110
1111 for (i = 0; i < threaddata()->MAXSOCKS; i++) {
1112 if (!(socklist[i].flags & (SOCK_UNUSED | SOCK_TCL)) &&
1113 (socklist[i].handler.sock.outbuf != NULL) && (FD_ISSET(socklist[i].sock, &wfds))) {
1114 /* Trick tputs into doing the work */
1115 errno = 0;
1116 x = write(socklist[i].sock, socklist[i].handler.sock.outbuf, socklist[i].handler.sock.outbuflen);
1117 if ((x < 0) && (errno != EAGAIN)
1118 #ifdef EBADSLT
1119 && (errno != EBADSLT)
1120 #endif
1121 #ifdef ENOTCONN
1122 && (errno != ENOTCONN)
1123 #endif
1124 ) {
1125 /* This detects an EOF during writing */
1126 debug3("net: eof!(write) socket %d (%s,%d)", socklist[i].sock,
1127 strerror(errno), errno);
1128 socklist[i].flags |= SOCK_EOFD;
1129 } else if (x == socklist[i].handler.sock.outbuflen) {
1130 /* If the whole buffer was sent, nuke it */
1131 nfree(socklist[i].handler.sock.outbuf);
1132 socklist[i].handler.sock.outbuf = NULL;
1133 socklist[i].handler.sock.outbuflen = 0;
1134 } else if (x > 0) {
1135 char *p = socklist[i].handler.sock.outbuf;
1136
1137 /* This removes any sent bytes from the beginning of the buffer */
1138 socklist[i].handler.sock.outbuf = nmalloc(socklist[i].handler.sock.outbuflen - x);
1139 egg_memcpy(socklist[i].handler.sock.outbuf, p + x, socklist[i].handler.sock.outbuflen - x);
1140 socklist[i].handler.sock.outbuflen -= x;
1141 nfree(p);
1142 } else {
1143 debug3("dequeue_sockets(): errno = %d (%s) on %d", errno,
1144 strerror(errno), socklist[i].sock);
1145 }
1146 /* All queued data was sent. Call handler if one exists and the
1147 * dcc entry wants it.
1148 */
1149 if (!socklist[i].handler.sock.outbuf) {
1150 int idx = findanyidx(socklist[i].sock);
1151
1152 if (idx > 0 && dcc[idx].type && dcc[idx].type->outdone)
1153 dcc[idx].type->outdone(idx);
1154 }
1155 }
1156 }
1157 }
1158
1159
1160 /*
1161 * Debugging stuff
1162 */
1163
1164 void tell_netdebug(int idx)
1165 {
1166 int i;
1167 char s[80];
1168
1169 dprintf(idx, "Open sockets:");
1170 for (i = 0; i < threaddata()->MAXSOCKS; i++) {
1171 if (!(socklist[i].flags & SOCK_UNUSED)) {
1172 sprintf(s, " %d", socklist[i].sock);
1173 if (socklist[i].flags & SOCK_BINARY)
1174 strcat(s, " (binary)");
1175 if (socklist[i].flags & SOCK_LISTEN)
1176 strcat(s, " (listen)");
1177 if (socklist[i].flags & SOCK_PASS)
1178 strcat(s, " (passed on)");
1179 if (socklist[i].flags & SOCK_CONNECT)
1180 strcat(s, " (connecting)");
1181 if (socklist[i].flags & SOCK_STRONGCONN)
1182 strcat(s, " (strong)");
1183 if (socklist[i].flags & SOCK_NONSOCK)
1184 strcat(s, " (file)");
1185 if (socklist[i].flags & SOCK_TCL)
1186 strcat(s, " (tcl)");
1187 if (!(socklist[i].flags & SOCK_TCL)) {
1188 if (socklist[i].handler.sock.inbuf != NULL)
1189 sprintf(&s[strlen(s)], " (inbuf: %04X)",
1190 (unsigned int) strlen(socklist[i].handler.sock.inbuf));
1191 if (socklist[i].handler.sock.outbuf != NULL)
1192 sprintf(&s[strlen(s)], " (outbuf: %06lX)", socklist[i].handler.sock.outbuflen);
1193 }
1194 strcat(s, ",");
1195 dprintf(idx, "%s", s);
1196 }
1197 }
1198 dprintf(idx, " done.\n");
1199 }
1200
1201 /* Security-flavoured sanity checking on DCC connections of all sorts can be
1202 * done with this routine. Feed it the proper information from your DCC
1203 * before you attempt the connection, and this will make an attempt at
1204 * figuring out if the connection is really that person, or someone screwing
1205 * around. It's not foolproof, but anything that fails this check probably
1206 * isn't going to work anyway due to masquerading firewalls, NAT routers,
1207 * or bugs in mIRC.
1208 */
1209 int sanitycheck_dcc(char *nick, char *from, char *ipaddy, char *port)
1210 {
1211 /* According to the latest RFC, the clients SHOULD be able to handle
1212 * DNS names that are up to 255 characters long. This is not broken.
1213 */
1214
1215 #ifdef IPV6
1216 char badaddress[INET6_ADDRSTRLEN];
1217 sockname_t name;
1218 IP ip = 0;
1219 #else
1220 char badaddress[sizeof "255.255.255.255"];
1221 IP ip = my_atoul(ipaddy);
1222 #endif
1223 int prt = atoi(port);
1224
1225 /* It is disabled HERE so we only have to check in *one* spot! */
1226 if (!dcc_sanitycheck)
1227 return 1;
1228
1229 if (prt < 1) {
1230 putlog(LOG_MISC, "*", "ALERT: (%s!%s) specified an impossible port of %u!",
1231 nick, from, prt);
1232 return 0;
1233 }
1234 #ifdef IPV6
1235 if (strchr(ipaddy, ':')) {
1236 if (inet_pton(AF_INET6, ipaddy, &name.addr.s6.sin6_addr) != 1) {
1237 putlog(LOG_MISC, "*", "ALERT: (%s!%s) specified an invalid IPv6 "
1238 "address of %s!", nick, from, ipaddy);
1239 return 0;
1240 }
1241 if (IN6_IS_ADDR_V4MAPPED(&name.addr.s6.sin6_addr))
1242 ip = ntohl(*(IP *) &name.addr.s6.sin6_addr.s6_addr[12]);
1243 }
1244 #endif
1245 if (ip && inet_ntop(AF_INET, &ip, badaddress, sizeof badaddress) &&
1246 (ip < (1 << 24))) {
1247 putlog(LOG_MISC, "*", "ALERT: (%s!%s) specified an impossible IP of %s!",
1248 nick, from, badaddress);
1249 return 0;
1250 }
1251 return 1;
1252 }
1253
1254 int hostsanitycheck_dcc(char *nick, char *from, sockname_t *ip, char *dnsname,
1255 char *prt)
1256 {
1257 char badaddress[INET6_ADDRSTRLEN];
1258
1259 /* According to the latest RFC, the clients SHOULD be able to handle
1260 * DNS names that are up to 255 characters long. This is not broken.
1261 */
1262 char hostn[256];
1263
1264 /* It is disabled HERE so we only have to check in *one* spot! */
1265 if (!dcc_sanitycheck)
1266 return 1;
1267 strcpy(badaddress, iptostr(&ip->addr.sa));
1268 /* These should pad like crazy with zeros, since 120 bytes or so is
1269 * where the routines providing our data currently lose interest. I'm
1270 * using the n-variant in case someone changes that...
1271 */
1272 strncpyz(hostn, extracthostname(from), sizeof hostn);
1273 if (!egg_strcasecmp(hostn, dnsname)) {
1274 putlog(LOG_DEBUG, "*", "DNS information for submitted IP checks out.");
1275 return 1;
1276 }
1277 if (!strcmp(badaddress, dnsname))
1278 putlog(LOG_MISC, "*", "ALERT: (%s!%s) sent a DCC request with bogus IP "
1279 "information of %s port %s. %s does not resolve to %s!", nick, from,
1280 badaddress, prt, from, badaddress);
1281 else
1282 return 1; /* <- usually happens when we have
1283 * a user with an unresolved hostmask! */
1284 return 0;
1285 }
1286
1287 /* Checks wether the referenced socket has data queued.
1288 *
1289 * Returns true if the incoming/outgoing (depending on 'type') queues
1290 * contain data, otherwise false.
1291 */
1292 int sock_has_data(int type, int sock)
1293 {
1294 int ret = 0, i;
1295
1296 for (i = 0; i < threaddata()->MAXSOCKS; i++)
1297 if (!(socklist[i].flags & SOCK_UNUSED) && socklist[i].sock == sock)
1298 break;
1299 if (i < threaddata()->MAXSOCKS) {
1300 switch (type) {
1301 case SOCK_DATA_OUTGOING:
1302 ret = (socklist[i].handler.sock.outbuf != NULL);
1303 break;
1304 case SOCK_DATA_INCOMING:
1305 ret = (socklist[i].handler.sock.inbuf != NULL);
1306 break;
1307 }
1308 } else
1309 debug1("sock_has_data: could not find socket #%d, returning false.", sock);
1310 return ret;
1311 }
1312
1313 /* flush_inbuf():
1314 * checks if there's data in the incoming buffer of an connection
1315 * and flushs the buffer if possible
1316 *
1317 * returns: -1 if the dcc entry wasn't found
1318 * -2 if dcc[idx].type->activity doesn't exist and the data couldn't
1319 * be handled
1320 * 0 if buffer was empty
1321 * otherwise length of flushed buffer
1322 */
1323 int flush_inbuf(int idx)
1324 {
1325 int i, len;
1326 char *inbuf;
1327
1328 Assert((idx >= 0) && (idx < dcc_total));
1329 for (i = 0; i < threaddata()->MAXSOCKS; i++) {
1330 if ((dcc[idx].sock == socklist[i].sock) &&
1331 !(socklist[i].flags & SOCK_UNUSED)) {
1332 len = socklist[i].handler.sock.inbuflen;
1333 if ((len > 0) && socklist[i].handler.sock.inbuf) {
1334 if (dcc[idx].type && dcc[idx].type->activity) {
1335 inbuf = socklist[i].handler.sock.inbuf;
1336 socklist[i].handler.sock.inbuf = NULL;
1337 dcc[idx].type->activity(idx, inbuf, len);
1338 nfree(inbuf);
1339 return len;
1340 } else
1341 return -2;
1342 } else
1343 return 0;
1344 }
1345 }
1346 return -1;
1347 }

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