/[cvs]/eggdrop1.8/src/net.c
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Revision 1.6 - (show annotations) (download) (as text)
Wed Oct 20 13:07:13 2010 UTC (8 years, 7 months ago) by pseudo
Branch: MAIN
Branch point for: gettext
Changes since 1.5: +11 -10 lines
File MIME type: text/x-chdr
Clarified the OpenSSL version requirements.
Rewrote open_telnet() to make it more useful.
Replaced some calls to open_telnet_raw() with open_telnet().

1 /*
2 * net.c -- handles:
3 * all raw network i/o
4 *
5 * $Id: net.c,v 1.5 2010/10/19 12:13:33 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 #ifdef TLS
48 # include <openssl/err.h>
49 #endif
50
51 #ifndef HAVE_GETDTABLESIZE
52 # ifdef FD_SETSIZE
53 # define getdtablesize() FD_SETSIZE
54 # else
55 # define getdtablesize() 200
56 # endif
57 #endif
58
59 extern struct dcc_t *dcc;
60 extern int backgrd, use_stderr, resolve_timeout, dcc_total;
61 extern unsigned long otraffic_irc_today, otraffic_bn_today, otraffic_dcc_today,
62 otraffic_filesys_today, otraffic_trans_today,
63 otraffic_unknown_today;
64
65 char natip[121] = ""; /* Public IPv4 to report for systems behind NAT */
66 char listen_ip[121] = ""; /* IP (or hostname) for listening sockets */
67 char vhost[121] = ""; /* IPv4 vhost for outgoing connections */
68 #ifdef IPV6
69 char vhost6[121] = ""; /* IPv6 vhost for outgoing connections */
70 int pref_af = 0; /* Prefer IPv6 over IPv4? */
71 #endif
72 char firewall[121] = ""; /* Socks server for firewall. */
73 int firewallport = 1080; /* Default port of socks 4/5 firewalls. */
74 char botuser[21] = "eggdrop"; /* Username of the user running the bot. */
75 int dcc_sanitycheck = 0; /* Do some sanity checking on dcc connections. */
76
77 sock_list *socklist = NULL; /* Enough to be safe. */
78 sigjmp_buf alarmret; /* Env buffer for alarm() returns. */
79
80 /* Types of proxies */
81 #define PROXY_SOCKS 1
82 #define PROXY_SUN 2
83
84
85 /* I need an UNSIGNED long for dcc type stuff
86 */
87 IP my_atoul(char *s)
88 {
89 IP ret = 0;
90
91 while ((*s >= '0') && (*s <= '9')) {
92 ret *= 10;
93 ret += ((*s) - '0');
94 s++;
95 }
96 return ret;
97 }
98
99 int expmem_net()
100 {
101 int i, tot = 0;
102 struct threaddata *td = threaddata();
103
104 for (i = 0; i < td->MAXSOCKS; i++) {
105 if (!(td->socklist[i].flags & (SOCK_UNUSED | SOCK_TCL))) {
106 if (td->socklist[i].handler.sock.inbuf != NULL)
107 tot += strlen(td->socklist[i].handler.sock.inbuf) + 1;
108 if (td->socklist[i].handler.sock.outbuf != NULL)
109 tot += td->socklist[i].handler.sock.outbuflen;
110 }
111 }
112 return tot;
113 }
114
115 /* Extract the IP address from a sockaddr struct and convert it
116 * to presentation format.
117 */
118 char *iptostr(struct sockaddr *sa)
119 {
120 #ifdef IPV6
121 static char s[INET6_ADDRSTRLEN] = "";
122 if (sa->sa_family == AF_INET6)
123 inet_ntop(AF_INET6, &((struct sockaddr_in6 *)sa)->sin6_addr,
124 s, sizeof s);
125 else
126 #else
127 static char s[sizeof "255.255.255.255"] = "";
128 #endif
129 inet_ntop(AF_INET, &((struct sockaddr_in *)sa)->sin_addr.s_addr, s,
130 sizeof s);
131 return s;
132 }
133
134 /* Fills in a sockname struct with the given server and port. If the string
135 * pointed by src isn't an IP address and allowres is not null, the function
136 * will assume it's a hostname and will attempt to resolve it. This is
137 * convenient, but you should use the async dns functions where possible, to
138 * avoid blocking the bot while the lookup is performed.
139 */
140 int setsockname(sockname_t *addr, char *src, int port, int allowres)
141 {
142 struct hostent *hp;
143 int af = AF_UNSPEC;
144 #ifdef IPV6
145 int pref;
146
147 /* Clean start */
148 egg_bzero(addr, sizeof(sockname_t));
149 af = pref = pref_af ? AF_INET6 : AF_INET;
150 if (pref == AF_INET) {
151 if (!egg_inet_aton(src, &addr->addr.s4.sin_addr))
152 af = AF_INET6;
153 } else {
154 if (inet_pton(af, src, &addr->addr.s6.sin6_addr) != 1)
155 af = AF_INET;
156 }
157 if (af != pref)
158 if (((af == AF_INET6) &&
159 (inet_pton(af, src, &addr->addr.s6.sin6_addr) != 1)) ||
160 ((af == AF_INET) &&
161 !egg_inet_aton(src, &addr->addr.s4.sin_addr)))
162 af = AF_UNSPEC;
163
164 if (af == AF_UNSPEC && allowres) {
165 /* src is a hostname. Attempt to resolve it.. */
166 if (!sigsetjmp(alarmret, 1)) {
167 alarm(resolve_timeout);
168 hp = gethostbyname2(src, pref_af ? AF_INET6 : AF_INET);
169 if (!hp)
170 hp = gethostbyname2(src, pref_af ? AF_INET : AF_INET6);
171 alarm(0);
172 } else
173 hp = NULL;
174 if (hp) {
175 if (hp->h_addrtype == AF_INET)
176 egg_memcpy(&addr->addr.s4.sin_addr, hp->h_addr, hp->h_length);
177 else
178 egg_memcpy(&addr->addr.s6.sin6_addr, hp->h_addr, hp->h_length);
179 af = hp->h_addrtype;
180 }
181 }
182
183 addr->family = (af == AF_UNSPEC) ? pref : af;
184 addr->addr.sa.sa_family = addr->family;
185 if (addr->family == AF_INET6) {
186 addr->addrlen = sizeof(struct sockaddr_in6);
187 addr->addr.s6.sin6_port = htons(port);
188 addr->addr.s6.sin6_family = AF_INET6;
189 } else {
190 addr->addrlen = sizeof(struct sockaddr_in);
191 addr->addr.s4.sin_port = htons(port);
192 addr->addr.s4.sin_family = AF_INET;
193 }
194 #else
195 egg_bzero(addr, sizeof(sockname_t));
196 if (!egg_inet_aton(src, &addr->addr.s4.sin_addr) && allowres) {
197 /* src is a hostname. Attempt to resolve it.. */
198 if (!sigsetjmp(alarmret, 1)) {
199 alarm(resolve_timeout);
200 hp = gethostbyname(src);
201 alarm(0);
202 } else
203 hp = NULL;
204 if (hp) {
205 egg_memcpy(&addr->addr.s4.sin_addr, hp->h_addr, hp->h_length);
206 af = hp->h_addrtype;
207 }
208 } else
209 af = AF_INET;
210
211 addr->family = addr->addr.s4.sin_family = AF_INET;
212 addr->addr.sa.sa_family = addr->family;
213 addr->addrlen = sizeof(struct sockaddr_in);
214 addr->addr.s4.sin_port = htons(port);
215 #endif
216 return af;
217 }
218
219 /* Get socket address to bind to for outbound connections
220 */
221 void getvhost(sockname_t *addr, int af)
222 {
223 char *h;
224
225 if (af == AF_INET)
226 h = vhost;
227 #ifdef IPV6
228 else
229 h = vhost6;
230 #endif
231 if (setsockname(addr, h, 0, 1) != af)
232 setsockname(addr, (af == AF_INET ? "0" : "::"), 0, 0);
233 /* Remember this 'self-lookup failed' thingie?
234 I have good news - you won't see it again ;) */
235 }
236
237 /* Sets/Unsets options for a specific socket.
238 *
239 * Returns: 0 - on success
240 * -1 - socket not found
241 * -2 - illegal operation
242 */
243 int sockoptions(int sock, int operation, int sock_options)
244 {
245 int i;
246 struct threaddata *td = threaddata();
247
248 for (i = 0; i < td->MAXSOCKS; i++)
249 if ((td->socklist[i].sock == sock) &&
250 !(td->socklist[i].flags & SOCK_UNUSED)) {
251 if (operation == EGG_OPTION_SET)
252 td->socklist[i].flags |= sock_options;
253 else if (operation == EGG_OPTION_UNSET)
254 td->socklist[i].flags &= ~sock_options;
255 else
256 return -2;
257 return 0;
258 }
259 return -1;
260 }
261
262 /* Return a free entry in the socket entry
263 */
264 int allocsock(int sock, int options)
265 {
266 int i;
267 struct threaddata *td = threaddata();
268
269 for (i = 0; i < td->MAXSOCKS; i++) {
270 if (td->socklist[i].flags & SOCK_UNUSED) {
271 /* yay! there is table space */
272 td->socklist[i].handler.sock.inbuf = NULL;
273 td->socklist[i].handler.sock.outbuf = NULL;
274 td->socklist[i].handler.sock.inbuflen = 0;
275 td->socklist[i].handler.sock.outbuflen = 0;
276 td->socklist[i].flags = options;
277 td->socklist[i].sock = sock;
278 #ifdef TLS
279 td->socklist[i].ssl = 0;
280 #endif
281 return i;
282 }
283 }
284 /* Try again if enlarging socketlist works */
285 if (increase_socks_max())
286 return -1;
287 else
288 return allocsock(sock, options);
289 }
290
291 /* Return a free entry in the socket entry for a tcl socket
292 *
293 * alloctclsock() can be called by Tcl threads
294 */
295 int alloctclsock(register int sock, int mask, Tcl_FileProc *proc, ClientData cd)
296 {
297 int f = -1;
298 register int i;
299 struct threaddata *td = threaddata();
300
301 for (i = 0; i < td->MAXSOCKS; i++) {
302 if (td->socklist[i].flags & SOCK_UNUSED) {
303 if (f == -1)
304 f = i;
305 } else if ((td->socklist[i].flags & SOCK_TCL) &&
306 td->socklist[i].sock == sock) {
307 f = i;
308 break;
309 }
310 }
311 if (f != -1) {
312 td->socklist[f].sock = sock;
313 td->socklist[f].flags = SOCK_TCL;
314 td->socklist[f].handler.tclsock.mask = mask;
315 td->socklist[f].handler.tclsock.proc = proc;
316 td->socklist[f].handler.tclsock.cd = cd;
317 return f;
318 }
319 /* Try again if enlarging socketlist works */
320 if (increase_socks_max())
321 return -1;
322 else
323 return alloctclsock(sock, mask, proc, cd);
324 }
325
326 /* Request a normal socket for i/o
327 */
328 void setsock(int sock, int options)
329 {
330 int i = allocsock(sock, options), parm;
331 struct threaddata *td = threaddata();
332
333 if (i == -1) {
334 putlog(LOG_MISC, "*", "Sockettable full.");
335 return;
336 }
337 if (((sock != STDOUT) || backgrd) && !(td->socklist[i].flags & SOCK_NONSOCK)) {
338 parm = 1;
339 setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (void *) &parm, sizeof(int));
340
341 parm = 0;
342 setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *) &parm, sizeof(int));
343 }
344 if (options & SOCK_LISTEN) {
345 /* Tris says this lets us grab the same port again next time */
346 parm = 1;
347 setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *) &parm, sizeof(int));
348 }
349 /* Yay async i/o ! */
350 fcntl(sock, F_SETFL, O_NONBLOCK);
351 }
352
353 int getsock(int af, int options)
354 {
355 int sock = socket(af, SOCK_STREAM, 0);
356
357 if (sock >= 0)
358 setsock(sock, options);
359 else
360 putlog(LOG_MISC, "*", "Warning: Can't create new socket: %s!",
361 strerror(errno));
362 return sock;
363 }
364
365 /* Done with a socket
366 */
367 void killsock(register int sock)
368 {
369 register int i;
370 struct threaddata *td = threaddata();
371
372 /* Ignore invalid sockets. */
373 if (sock < 0)
374 return;
375
376 for (i = 0; i < td->MAXSOCKS; i++) {
377 if ((td->socklist[i].sock == sock) && !(td->socklist[i].flags & SOCK_UNUSED)) {
378 if (!(td->socklist[i].flags & SOCK_TCL)) { /* nothing to free for tclsocks */
379 #ifdef TLS
380 if (td->socklist[i].ssl) {
381 SSL_shutdown(td->socklist[i].ssl);
382 nfree(SSL_get_app_data(td->socklist[i].ssl));
383 SSL_free(td->socklist[i].ssl);
384 td->socklist[i].ssl = NULL;
385 }
386 #endif
387 close(td->socklist[i].sock);
388 if (td->socklist[i].handler.sock.inbuf != NULL) {
389 nfree(td->socklist[i].handler.sock.inbuf);
390 td->socklist[i].handler.sock.inbuf = NULL;
391 }
392 if (td->socklist[i].handler.sock.outbuf != NULL) {
393 nfree(td->socklist[i].handler.sock.outbuf);
394 td->socklist[i].handler.sock.outbuf = NULL;
395 td->socklist[i].handler.sock.outbuflen = 0;
396 }
397 }
398 td->socklist[i].flags = SOCK_UNUSED;
399 return;
400 }
401 }
402 putlog(LOG_MISC, "*", "Warning: Attempt to kill un-allocated socket %d!", sock);
403 }
404
405 /* Done with a tcl socket
406 *
407 * killtclsock() can be called by Tcl threads
408 */
409 void killtclsock(register int sock)
410 {
411 register int i;
412 struct threaddata *td = threaddata();
413
414 if (sock < 0)
415 return;
416
417 for (i = 0; i < td->MAXSOCKS; i++) {
418 if ((td->socklist[i].flags & SOCK_TCL) && td->socklist[i].sock == sock) {
419 td->socklist[i].flags = SOCK_UNUSED;
420 return;
421 }
422 }
423 }
424
425 /* Send connection request to proxy
426 */
427 static int proxy_connect(int sock, sockname_t *addr)
428 {
429 sockname_t name;
430 char host[121], s[256];
431 int i, port, proxy;
432
433 if (!firewall[0])
434 return -2;
435 #ifdef IPV6
436 if (addr->family == AF_INET6) {
437 putlog(LOG_MISC, "*", "Eggdrop doesn't support IPv6 connections "
438 "through proxies yet.");
439 return -1;
440 }
441 #endif
442 if (firewall[0] == '!') {
443 proxy = PROXY_SUN;
444 strcpy(host, &firewall[1]);
445 } else {
446 proxy = PROXY_SOCKS;
447 strcpy(host, firewall);
448 }
449 port = addr->addr.s4.sin_port;
450 setsockname(&name, host, firewallport, 1);
451 if (connect(sock, &name.addr.sa, name.addrlen) < 0 && errno != EINPROGRESS)
452 return -1;
453 if (proxy == PROXY_SOCKS) {
454 for (i = 0; i < threaddata()->MAXSOCKS; i++)
455 if (!(socklist[i].flags & SOCK_UNUSED) && socklist[i].sock == sock)
456 socklist[i].flags |= SOCK_PROXYWAIT; /* drummer */
457 egg_memcpy(host, &addr->addr.s4.sin_addr.s_addr, 4);
458 egg_snprintf(s, sizeof s, "\004\001%c%c%c%c%c%c%s", port % 256,
459 (port >> 8) % 256, host[0], host[1], host[2], host[3], botuser);
460 tputs(sock, s, strlen(botuser) + 9); /* drummer */
461 } else if (proxy == PROXY_SUN) {
462 inet_ntop(AF_INET, &addr->addr.s4.sin_addr, host, sizeof host);
463 egg_snprintf(s, sizeof s, "%s %d\n", host, port);
464 tputs(sock, s, strlen(s)); /* drummer */
465 }
466 return sock;
467 }
468
469 /* Starts a connection attempt through a socket
470 *
471 * The server address should be filled in addr by setsockname() or by the
472 * non-blocking dns functions and setsnport().
473 *
474 * returns < 0 if connection refused:
475 * -1 strerror() type error
476 */
477 int open_telnet_raw(int sock, sockname_t *addr)
478 {
479 sockname_t name;
480 int i, rc;
481
482 getvhost(&name, addr->family);
483 if (bind(sock, &name.addr.sa, name.addrlen) < 0) {
484 return -1;
485 }
486 for (i = 0; i < threaddata()->MAXSOCKS; i++) {
487 if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].sock == sock))
488 socklist[i].flags = (socklist[i].flags & ~SOCK_VIRTUAL) | SOCK_CONNECT;
489 }
490 if (addr->family == AF_INET && firewall[0])
491 return proxy_connect(sock, addr);
492 rc = connect(sock, &addr->addr.sa, addr->addrlen);
493 if (rc < 0) {
494 if (errno == EINPROGRESS)
495 return sock; /* async success! */
496 else
497 return -1;
498 }
499 return sock;
500 }
501
502 /* Ordinary non-binary connection attempt
503 * Return values:
504 * >=0: connect successful, returned is the socket number
505 * -1: look at errno or use strerror()
506 * -2: lookup failed or server is not a valid IP string
507 * -3: could not allocate socket
508 */
509 int open_telnet(int idx, char *server, int port)
510 {
511 int ret;
512
513 ret = setsockname(&dcc[idx].sockname, server, port, 1);
514 if (ret == AF_UNSPEC)
515 return -2;
516 dcc[idx].port = port;
517 dcc[idx].sock = getsock(ret, 0);
518 if (dcc[idx].sock < 0)
519 return -3;
520 ret = open_telnet_raw(dcc[idx].sock, &dcc[idx].sockname);
521 if (ret < 0)
522 killsock(dcc[idx].sock);
523 return ret;
524 }
525
526 /* Returns a socket number for a listening socket that will accept any
527 * connection on the given address. The address can be filled in by
528 * setsockname().
529 */
530 int open_address_listen(sockname_t *addr)
531 {
532 int sock = 0;
533
534 sock = getsock(addr->family, SOCK_LISTEN);
535 if (sock < 0)
536 return -1;
537 #if defined IPV6 && IPV6_V6ONLY
538 if (addr->family == AF_INET6) {
539 int on = 0;
540 setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, (char *) &on, sizeof(on));
541 }
542 #endif
543 if (bind(sock, &addr->addr.sa, addr->addrlen) < 0) {
544 killsock(sock);
545 return -2;
546 }
547
548 if (getsockname(sock, &addr->addr.sa, &addr->addrlen) < 0) {
549 killsock(sock);
550 return -1;
551 }
552 if (listen(sock, 1) < 0) {
553 killsock(sock);
554 return -1;
555 }
556
557 return sock;
558 }
559
560 /* Returns a socket number for a listening socket that will accept any
561 * connection -- port # is returned in port
562 */
563 inline int open_listen(int *port)
564 {
565 int sock;
566 sockname_t name;
567
568 (void) setsockname(&name, listen_ip, *port, 1);
569 sock = open_address_listen(&name);
570 if (name.addr.sa.sa_family == AF_INET)
571 *port = ntohs(name.addr.s4.sin_port);
572 #ifdef IPV6
573 else
574 *port = ntohs(name.addr.s6.sin6_port);
575 #endif
576 return sock;
577 }
578
579 /* Short routine to answer a connect received on a listening socket.
580 * Returned is the new socket.
581 * If port is not NULL, it points to an integer to hold the port number
582 * of the caller.
583 */
584 int answer(int sock, sockname_t *caller, unsigned short *port, int binary)
585 {
586 int new_sock;
587 caller->addrlen = sizeof(caller->addr);
588 new_sock = accept(sock, &caller->addr.sa, &caller->addrlen);
589
590 if (new_sock < 0)
591 return -1;
592
593 caller->family = caller->addr.sa.sa_family;
594 if (port) {
595 if (caller->family == AF_INET)
596 *port = ntohs(caller->addr.s4.sin_port);
597 #ifdef IPV6
598 else
599 *port = ntohs(caller->addr.s6.sin6_port);
600 #endif
601 }
602 setsock(new_sock, (binary ? SOCK_BINARY : 0));
603 return new_sock;
604 }
605
606 /* Get DCC compatible address for a client to connect (e.g. 1660944385)
607 * If addr is not NULL, it should point to the listening socket's address.
608 * Otherwise, this function will try to figure out the public address of the
609 * machine, using listen_ip and natip.
610 * The result is a string useable for DCC requests
611 */
612 int getdccaddr(sockname_t *addr, char *s, size_t l)
613 {
614 char h[121];
615 sockname_t name, *r = &name;
616
617 if (addr)
618 r = addr;
619 else
620 setsockname(r, listen_ip, 0, 1);
621 if (
622 #ifdef IPV6
623 ((r->family == AF_INET6) &&
624 IN6_IS_ADDR_UNSPECIFIED(&r->addr.s6.sin6_addr)) ||
625 #endif
626 (r->family == AF_INET && !r->addr.s4.sin_addr.s_addr)) {
627 /* We can't send :: or 0.0.0.0 for dcc, so try
628 to figure out some real address */
629 r = &name;
630 gethostname(h, sizeof h);
631 setsockname(r, h, 0, 1);
632 }
633
634 if (
635 #ifdef IPV6
636 ((r->family == AF_INET6) &&
637 IN6_IS_ADDR_UNSPECIFIED(&r->addr.s6.sin6_addr)) ||
638 #endif
639 (!natip[0] && (r->family == AF_INET) && !r->addr.s4.sin_addr.s_addr))
640 return 0;
641
642 #ifdef IPV6
643 if (r->family == AF_INET6) {
644 if (IN6_IS_ADDR_V4MAPPED(&r->addr.s6.sin6_addr) ||
645 IN6_IS_ADDR_UNSPECIFIED(&r->addr.s6.sin6_addr))
646 snprintf(s, l, "%lu", natip[0] ? iptolong(inet_addr(natip)) :
647 ntohl(*(IP *) &r->addr.s6.sin6_addr.s6_addr[12]));
648 else
649 inet_ntop(AF_INET6, &r->addr.s6.sin6_addr, s, l);
650 } else
651 #endif
652 snprintf(s, l, "%lu", natip[0] ? iptolong(inet_addr(natip)) :
653 ntohl(r->addr.s4.sin_addr.s_addr));
654 return 1;
655 }
656
657 /* Builds the fd_sets for select(). Eggdrop only cares about readable
658 * sockets, but tcl also cares for writable/exceptions.
659 * preparefdset() can be called by Tcl Threads
660 */
661 int preparefdset(fd_set *fd, sock_list *slist, int slistmax, int tclonly, int tclmask)
662 {
663 int fdtmp, i, foundsocks = 0;
664
665 FD_ZERO(fd);
666 for (i = 0; i < slistmax; i++) {
667 if (!(slist[i].flags & (SOCK_UNUSED | SOCK_VIRTUAL))) {
668 if ((slist[i].sock == STDOUT) && !backgrd)
669 fdtmp = STDIN;
670 else
671 fdtmp = slist[i].sock;
672 /*
673 * Looks like that having more than a call, in the same
674 * program, to the FD_SET macro, triggers a bug in gcc.
675 * SIGBUS crashing binaries used to be produced on a number
676 * (prolly all?) of 64 bits architectures.
677 * Make your best to avoid to make it happen again.
678 *
679 * ITE
680 */
681 if (slist[i].flags & SOCK_TCL) {
682 if (!(slist[i].handler.tclsock.mask & tclmask))
683 continue;
684 } else if (tclonly)
685 continue;
686 foundsocks = 1;
687 FD_SET(fdtmp, fd);
688 }
689 }
690 return foundsocks;
691 }
692
693 /* Attempts to read from all sockets in slist (upper array boundary slistmax-1)
694 * fills s with up to 511 bytes if available, and returns the array index
695 * Also calls all handler procs for Tcl sockets
696 * sockread() can be called by Tcl threads
697 *
698 * on EOF: returns -1, with socket in len
699 * on socket error: returns -2
700 * if nothing is ready: returns -3
701 * tcl sockets busy: returns -5
702 */
703 int sockread(char *s, int *len, sock_list *slist, int slistmax, int tclonly)
704 {
705 struct timeval t;
706 fd_set fdr, fdw, fde;
707 int fds, i, x, have_r, have_w, have_e;
708 int grab = 511, tclsock = -1, events = 0;
709 struct threaddata *td = threaddata();
710
711 fds = getdtablesize();
712 #ifdef FD_SETSIZE
713 if (fds > FD_SETSIZE)
714 fds = FD_SETSIZE; /* Fixes YET ANOTHER freebsd bug!!! */
715 #endif
716
717 have_r = preparefdset(&fdr, slist, slistmax, tclonly, TCL_READABLE);
718 have_w = preparefdset(&fdw, slist, slistmax, 1, TCL_WRITABLE);
719 have_e = preparefdset(&fde, slist, slistmax, 1, TCL_EXCEPTION);
720
721 /* select() may modify the timeval argument - copy it */
722 t.tv_sec = td->blocktime.tv_sec;
723 t.tv_usec = td->blocktime.tv_usec;
724
725 x = select((SELECT_TYPE_ARG1) fds,
726 SELECT_TYPE_ARG234 (have_r ? &fdr : NULL),
727 SELECT_TYPE_ARG234 (have_w ? &fdw : NULL),
728 SELECT_TYPE_ARG234 (have_e ? &fde : NULL),
729 SELECT_TYPE_ARG5 &t);
730 if (x > 0) {
731 /* Something happened */
732 for (i = 0; i < slistmax; i++) {
733 if (!tclonly && ((!(slist[i].flags & (SOCK_UNUSED | SOCK_TCL))) &&
734 ((FD_ISSET(slist[i].sock, &fdr)) ||
735 #ifdef TLS
736 (slist[i].ssl && SSL_pending(slist[i].ssl)) ||
737 #endif
738 ((slist[i].sock == STDOUT) && (!backgrd) &&
739 (FD_ISSET(STDIN, &fdr)))))) {
740 if (slist[i].flags & (SOCK_LISTEN | SOCK_CONNECT)) {
741 /* Listening socket -- don't read, just return activity */
742 /* Same for connection attempt */
743 /* (for strong connections, require a read to succeed first) */
744 if (slist[i].flags & SOCK_PROXYWAIT) /* drummer */
745 /* Hang around to get the return code from proxy */
746 grab = 10;
747 #ifdef TLS
748 else if (!(slist[i].flags & SOCK_STRONGCONN) &&
749 (!(slist[i].ssl) || !SSL_in_init(slist[i].ssl))) {
750 #else
751 else if (!(slist[i].flags & SOCK_STRONGCONN)) {
752 #endif
753 debug1("net: connect! sock %d", slist[i].sock);
754 s[0] = 0;
755 *len = 0;
756 return i;
757 }
758 } else if (slist[i].flags & SOCK_PASS) {
759 s[0] = 0;
760 *len = 0;
761 return i;
762 }
763 errno = 0;
764 if ((slist[i].sock == STDOUT) && !backgrd)
765 x = read(STDIN, s, grab);
766 else
767 #ifdef TLS
768 {
769 if (slist[i].ssl) {
770 x = SSL_read(slist[i].ssl, s, grab);
771 if (x < 0) {
772 int err = SSL_get_error(slist[i].ssl, x);
773 if (err == SSL_ERROR_WANT_READ || err == SSL_ERROR_WANT_WRITE)
774 errno = EAGAIN;
775 else
776 debug1("SSL error: %s", ERR_error_string(ERR_get_error(), 0));
777 x = -1;
778 }
779 } else
780 x = read(slist[i].sock, s, grab);
781 }
782 #else
783 x = read(slist[i].sock, s, grab);
784 #endif
785 if (x <= 0) { /* eof */
786 if (errno != EAGAIN) { /* EAGAIN happens when the operation would
787 * block on a non-blocking socket, if the
788 * socket is going to die, it will die later,
789 * otherwise it will connect. */
790 *len = slist[i].sock;
791 slist[i].flags &= ~SOCK_CONNECT;
792 debug1("net: eof!(read) socket %d", slist[i].sock);
793 return -1;
794 } else {
795 debug3("sockread EAGAIN: %d %d (%s)", slist[i].sock, errno,
796 strerror(errno));
797 continue; /* EAGAIN */
798 }
799 }
800 s[x] = 0;
801 *len = x;
802 if (slist[i].flags & SOCK_PROXYWAIT) {
803 debug2("net: socket: %d proxy errno: %d", slist[i].sock, s[1]);
804 slist[i].flags &= ~(SOCK_CONNECT | SOCK_PROXYWAIT);
805 switch (s[1]) {
806 case 90: /* Success */
807 s[0] = 0;
808 *len = 0;
809 return i;
810 case 91: /* Failed */
811 errno = ECONNREFUSED;
812 break;
813 case 92: /* No identd */
814 case 93: /* Identd said wrong username */
815 /* A better error message would be "socks misconfigured"
816 * or "identd not working" but this is simplest.
817 */
818 errno = ENETUNREACH;
819 break;
820 }
821 *len = slist[i].sock;
822 return -1;
823 }
824 return i;
825 } else if (tclsock == -1 && (slist[i].flags & SOCK_TCL)) {
826 events = FD_ISSET(slist[i].sock, &fdr) ? TCL_READABLE : 0;
827 events |= FD_ISSET(slist[i].sock, &fdw) ? TCL_WRITABLE : 0;
828 events |= FD_ISSET(slist[i].sock, &fde) ? TCL_EXCEPTION : 0;
829 events &= slist[i].handler.tclsock.mask;
830 if (events)
831 tclsock = i;
832 }
833 }
834 } else if (x == -1)
835 return -2; /* socket error */
836 else if (!tclonly) {
837 s[0] = 0;
838 *len = 0;
839 }
840 if (tclsock != -1) {
841 (*slist[tclsock].handler.tclsock.proc)(slist[tclsock].handler.tclsock.cd,
842 events);
843 return -5;
844 }
845 return -3;
846 }
847
848 /* sockgets: buffer and read from sockets
849 *
850 * Attempts to read from all registered sockets for up to one second. if
851 * after one second, no complete data has been received from any of the
852 * sockets, 's' will be empty, 'len' will be 0, and sockgets will return -3.
853 * if there is returnable data received from a socket, the data will be
854 * in 's' (null-terminated if non-binary), the length will be returned
855 * in len, and the socket number will be returned.
856 * normal sockets have their input buffered, and each call to sockgets
857 * will return one line terminated with a '\n'. binary sockets are not
858 * buffered and return whatever coems in as soon as it arrives.
859 * listening sockets will return an empty string when a connection comes in.
860 * connecting sockets will return an empty string on a successful connect,
861 * or EOF on a failed connect.
862 * if an EOF is detected from any of the sockets, that socket number will be
863 * put in len, and -1 will be returned.
864 * the maximum length of the string returned is 512 (including null)
865 *
866 * Returns -4 if we handled something that shouldn't be handled by the
867 * dcc functions. Simply ignore it.
868 * Returns -5 if tcl sockets are busy but not eggdrop sockets.
869 */
870
871 int sockgets(char *s, int *len)
872 {
873 char xx[514], *p, *px;
874 int ret, i, data = 0;
875
876 for (i = 0; i < threaddata()->MAXSOCKS; i++) {
877 /* Check for stored-up data waiting to be processed */
878 if (!(socklist[i].flags & (SOCK_UNUSED | SOCK_TCL | SOCK_BUFFER)) &&
879 (socklist[i].handler.sock.inbuf != NULL)) {
880 if (!(socklist[i].flags & SOCK_BINARY)) {
881 /* look for \r too cos windows can't follow RFCs */
882 p = strchr(socklist[i].handler.sock.inbuf, '\n');
883 if (p == NULL)
884 p = strchr(socklist[i].handler.sock.inbuf, '\r');
885 if (p != NULL) {
886 *p = 0;
887 if (strlen(socklist[i].handler.sock.inbuf) > 510)
888 socklist[i].handler.sock.inbuf[510] = 0;
889 strcpy(s, socklist[i].handler.sock.inbuf);
890 px = nmalloc(strlen(p + 1) + 1);
891 strcpy(px, p + 1);
892 nfree(socklist[i].handler.sock.inbuf);
893 if (px[0])
894 socklist[i].handler.sock.inbuf = px;
895 else {
896 nfree(px);
897 socklist[i].handler.sock.inbuf = NULL;
898 }
899 /* Strip CR if this was CR/LF combo */
900 if (s[strlen(s) - 1] == '\r')
901 s[strlen(s) - 1] = 0;
902 *len = strlen(s);
903 return socklist[i].sock;
904 }
905 } else {
906 /* Handling buffered binary data (must have been SOCK_BUFFER before). */
907 if (socklist[i].handler.sock.inbuflen <= 510) {
908 *len = socklist[i].handler.sock.inbuflen;
909 egg_memcpy(s, socklist[i].handler.sock.inbuf, socklist[i].handler.sock.inbuflen);
910 nfree(socklist[i].handler.sock.inbuf);
911 socklist[i].handler.sock.inbuf = NULL;
912 socklist[i].handler.sock.inbuflen = 0;
913 } else {
914 /* Split up into chunks of 510 bytes. */
915 *len = 510;
916 egg_memcpy(s, socklist[i].handler.sock.inbuf, *len);
917 egg_memcpy(socklist[i].handler.sock.inbuf, socklist[i].handler.sock.inbuf + *len, *len);
918 socklist[i].handler.sock.inbuflen -= *len;
919 socklist[i].handler.sock.inbuf = nrealloc(socklist[i].handler.sock.inbuf, socklist[i].handler.sock.inbuflen);
920 }
921 return socklist[i].sock;
922 }
923 }
924 /* Also check any sockets that might have EOF'd during write */
925 if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].flags & SOCK_EOFD)) {
926 s[0] = 0;
927 *len = socklist[i].sock;
928 return -1;
929 }
930 }
931 /* No pent-up data of any worth -- down to business */
932 *len = 0;
933 ret = sockread(xx, len, socklist, threaddata()->MAXSOCKS, 0);
934 if (ret < 0) {
935 s[0] = 0;
936 return ret;
937 }
938 /* Binary, listening and passed on sockets don't get buffered. */
939 if (socklist[ret].flags & SOCK_CONNECT) {
940 if (socklist[ret].flags & SOCK_STRONGCONN) {
941 socklist[ret].flags &= ~SOCK_STRONGCONN;
942 /* Buffer any data that came in, for future read. */
943 socklist[ret].handler.sock.inbuflen = *len;
944 socklist[ret].handler.sock.inbuf = nmalloc(*len + 1);
945 /* It might be binary data. You never know. */
946 egg_memcpy(socklist[ret].handler.sock.inbuf, xx, *len);
947 socklist[ret].handler.sock.inbuf[*len] = 0;
948 }
949 socklist[ret].flags &= ~SOCK_CONNECT;
950 s[0] = 0;
951 return socklist[ret].sock;
952 }
953 if (socklist[ret].flags & SOCK_BINARY) {
954 egg_memcpy(s, xx, *len);
955 return socklist[ret].sock;
956 }
957 if (socklist[ret].flags & (SOCK_LISTEN | SOCK_PASS | SOCK_TCL)) {
958 s[0] = 0; /* for the dcc traffic counters in the mainloop */
959 return socklist[ret].sock;
960 }
961 if (socklist[ret].flags & SOCK_BUFFER) {
962 socklist[ret].handler.sock.inbuf = (char *) nrealloc(socklist[ret].handler.sock.inbuf,
963 socklist[ret].handler.sock.inbuflen + *len + 1);
964 egg_memcpy(socklist[ret].handler.sock.inbuf + socklist[ret].handler.sock.inbuflen, xx, *len);
965 socklist[ret].handler.sock.inbuflen += *len;
966 /* We don't know whether it's binary data. Make sure normal strings
967 * will be handled properly later on too. */
968 socklist[ret].handler.sock.inbuf[socklist[ret].handler.sock.inbuflen] = 0;
969 return -4; /* Ignore this one. */
970 }
971 /* Might be necessary to prepend stored-up data! */
972 if (socklist[ret].handler.sock.inbuf != NULL) {
973 p = socklist[ret].handler.sock.inbuf;
974 socklist[ret].handler.sock.inbuf = nmalloc(strlen(p) + strlen(xx) + 1);
975 strcpy(socklist[ret].handler.sock.inbuf, p);
976 strcat(socklist[ret].handler.sock.inbuf, xx);
977 nfree(p);
978 if (strlen(socklist[ret].handler.sock.inbuf) < 512) {
979 strcpy(xx, socklist[ret].handler.sock.inbuf);
980 nfree(socklist[ret].handler.sock.inbuf);
981 socklist[ret].handler.sock.inbuf = NULL;
982 socklist[ret].handler.sock.inbuflen = 0;
983 } else {
984 p = socklist[ret].handler.sock.inbuf;
985 socklist[ret].handler.sock.inbuflen = strlen(p) - 510;
986 socklist[ret].handler.sock.inbuf = nmalloc(socklist[ret].handler.sock.inbuflen + 1);
987 strcpy(socklist[ret].handler.sock.inbuf, p + 510);
988 *(p + 510) = 0;
989 strcpy(xx, p);
990 nfree(p);
991 /* (leave the rest to be post-pended later) */
992 }
993 }
994 /* Look for EOL marker; if it's there, i have something to show */
995 p = strchr(xx, '\n');
996 if (p == NULL)
997 p = strchr(xx, '\r');
998 if (p != NULL) {
999 *p = 0;
1000 strcpy(s, xx);
1001 memmove(xx, p + 1, strlen(p + 1) + 1);
1002 if (s[strlen(s) - 1] == '\r')
1003 s[strlen(s) - 1] = 0;
1004 data = 1; /* DCC_CHAT may now need to process a blank line */
1005 /* NO! */
1006 /* if (!s[0]) strcpy(s," "); */
1007 } else {
1008 s[0] = 0;
1009 if (strlen(xx) >= 510) {
1010 /* String is too long, so just insert fake \n */
1011 strcpy(s, xx);
1012 xx[0] = 0;
1013 data = 1;
1014 }
1015 }
1016 *len = strlen(s);
1017 /* Anything left that needs to be saved? */
1018 if (!xx[0]) {
1019 if (data)
1020 return socklist[ret].sock;
1021 else
1022 return -3;
1023 }
1024 /* Prepend old data back */
1025 if (socklist[ret].handler.sock.inbuf != NULL) {
1026 p = socklist[ret].handler.sock.inbuf;
1027 socklist[ret].handler.sock.inbuflen = strlen(p) + strlen(xx);
1028 socklist[ret].handler.sock.inbuf = nmalloc(socklist[ret].handler.sock.inbuflen + 1);
1029 strcpy(socklist[ret].handler.sock.inbuf, xx);
1030 strcat(socklist[ret].handler.sock.inbuf, p);
1031 nfree(p);
1032 } else {
1033 socklist[ret].handler.sock.inbuflen = strlen(xx);
1034 socklist[ret].handler.sock.inbuf = nmalloc(socklist[ret].handler.sock.inbuflen + 1);
1035 strcpy(socklist[ret].handler.sock.inbuf, xx);
1036 }
1037 if (data)
1038 return socklist[ret].sock;
1039 else
1040 return -3;
1041 }
1042
1043 /* Dump something to a socket
1044 *
1045 * NOTE: Do NOT put Contexts in here if you want DEBUG to be meaningful!!
1046 */
1047 void tputs(register int z, char *s, unsigned int len)
1048 {
1049 register int i, x, idx;
1050 char *p;
1051 static int inhere = 0;
1052
1053 if (z < 0) /* um... HELLO?! sanity check please! */
1054 return;
1055
1056 if (((z == STDOUT) || (z == STDERR)) && (!backgrd || use_stderr)) {
1057 write(z, s, len);
1058 return;
1059 }
1060
1061 for (i = 0; i < threaddata()->MAXSOCKS; i++) {
1062 if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].sock == z)) {
1063 for (idx = 0; idx < dcc_total; idx++) {
1064 if ((dcc[idx].sock == z) && dcc[idx].type && dcc[idx].type->name) {
1065 if (!strncmp(dcc[idx].type->name, "BOT", 3))
1066 otraffic_bn_today += len;
1067 else if (!strcmp(dcc[idx].type->name, "SERVER"))
1068 otraffic_irc_today += len;
1069 else if (!strncmp(dcc[idx].type->name, "CHAT", 4))
1070 otraffic_dcc_today += len;
1071 else if (!strncmp(dcc[idx].type->name, "FILES", 5))
1072 otraffic_filesys_today += len;
1073 else if (!strcmp(dcc[idx].type->name, "SEND"))
1074 otraffic_trans_today += len;
1075 else if (!strncmp(dcc[idx].type->name, "GET", 3))
1076 otraffic_trans_today += len;
1077 else
1078 otraffic_unknown_today += len;
1079 break;
1080 }
1081 }
1082
1083 if (socklist[i].handler.sock.outbuf != NULL) {
1084 /* Already queueing: just add it */
1085 p = (char *) nrealloc(socklist[i].handler.sock.outbuf, socklist[i].handler.sock.outbuflen + len);
1086 egg_memcpy(p + socklist[i].handler.sock.outbuflen, s, len);
1087 socklist[i].handler.sock.outbuf = p;
1088 socklist[i].handler.sock.outbuflen += len;
1089 return;
1090 }
1091 #ifdef TLS
1092 if (socklist[i].ssl) {
1093 x = SSL_write(socklist[i].ssl, s, len);
1094 if (x < 0) {
1095 int err = SSL_get_error(socklist[i].ssl, x);
1096 if (err == SSL_ERROR_WANT_WRITE || err == SSL_ERROR_WANT_READ)
1097 errno = EAGAIN;
1098 else if (!inhere) { /* Out there, somewhere */
1099 inhere = 1;
1100 debug1("SSL error: %s", ERR_error_string(ERR_get_error(), 0));
1101 inhere = 0;
1102 }
1103 x = -1;
1104 }
1105 } else /* not ssl, use regular write() */
1106 #endif
1107 /* Try. */
1108 x = write(z, s, len);
1109 if (x == -1)
1110 x = 0;
1111 if (x < len) {
1112 /* Socket is full, queue it */
1113 socklist[i].handler.sock.outbuf = nmalloc(len - x);
1114 egg_memcpy(socklist[i].handler.sock.outbuf, &s[x], len - x);
1115 socklist[i].handler.sock.outbuflen = len - x;
1116 }
1117 return;
1118 }
1119 }
1120 /* Make sure we don't cause a crash by looping here */
1121 if (!inhere) {
1122 inhere = 1;
1123
1124 putlog(LOG_MISC, "*", "!!! writing to nonexistent socket: %d", z);
1125 s[strlen(s) - 1] = 0;
1126 putlog(LOG_MISC, "*", "!-> '%s'", s);
1127
1128 inhere = 0;
1129 }
1130 }
1131
1132 /* tputs might queue data for sockets, let's dump as much of it as
1133 * possible.
1134 */
1135 void dequeue_sockets()
1136 {
1137 int i, x;
1138
1139 int z = 0, fds;
1140 fd_set wfds;
1141 struct timeval tv;
1142
1143 /* ^-- start poptix test code, this should avoid writes to sockets not ready to be written to. */
1144 fds = getdtablesize();
1145
1146 #ifdef FD_SETSIZE
1147 if (fds > FD_SETSIZE)
1148 fds = FD_SETSIZE; /* Fixes YET ANOTHER freebsd bug!!! */
1149 #endif
1150 FD_ZERO(&wfds);
1151 tv.tv_sec = 0;
1152 tv.tv_usec = 0; /* we only want to see if it's ready for writing, no need to actually wait.. */
1153 for (i = 0; i < threaddata()->MAXSOCKS; i++) {
1154 if (!(socklist[i].flags & (SOCK_UNUSED | SOCK_TCL)) &&
1155 socklist[i].handler.sock.outbuf != NULL) {
1156 FD_SET(socklist[i].sock, &wfds);
1157 z = 1;
1158 }
1159 }
1160 if (!z)
1161 return; /* nothing to write */
1162
1163 select((SELECT_TYPE_ARG1) fds, SELECT_TYPE_ARG234 NULL,
1164 SELECT_TYPE_ARG234 &wfds, SELECT_TYPE_ARG234 NULL,
1165 SELECT_TYPE_ARG5 &tv);
1166
1167 /* end poptix */
1168
1169 for (i = 0; i < threaddata()->MAXSOCKS; i++) {
1170 if (!(socklist[i].flags & (SOCK_UNUSED | SOCK_TCL)) &&
1171 (socklist[i].handler.sock.outbuf != NULL) && (FD_ISSET(socklist[i].sock, &wfds))) {
1172 /* Trick tputs into doing the work */
1173 errno = 0;
1174 #ifdef TLS
1175 if (socklist[i].ssl) {
1176 x = SSL_write(socklist[i].ssl, socklist[i].handler.sock.outbuf,
1177 socklist[i].handler.sock.outbuflen);
1178 if (x < 0) {
1179 int err = SSL_get_error(socklist[i].ssl, x);
1180 if (err == SSL_ERROR_WANT_WRITE || err == SSL_ERROR_WANT_READ)
1181 errno = EAGAIN;
1182 else
1183 debug1("SSL error: %s", ERR_error_string(ERR_get_error(), 0));
1184 x = -1;
1185 }
1186 } else
1187 #endif
1188 x = write(socklist[i].sock, socklist[i].handler.sock.outbuf, socklist[i].handler.sock.outbuflen);
1189 if ((x < 0) && (errno != EAGAIN)
1190 #ifdef EBADSLT
1191 && (errno != EBADSLT)
1192 #endif
1193 #ifdef ENOTCONN
1194 && (errno != ENOTCONN)
1195 #endif
1196 ) {
1197 /* This detects an EOF during writing */
1198 debug3("net: eof!(write) socket %d (%s,%d)", socklist[i].sock,
1199 strerror(errno), errno);
1200 socklist[i].flags |= SOCK_EOFD;
1201 } else if (x == socklist[i].handler.sock.outbuflen) {
1202 /* If the whole buffer was sent, nuke it */
1203 nfree(socklist[i].handler.sock.outbuf);
1204 socklist[i].handler.sock.outbuf = NULL;
1205 socklist[i].handler.sock.outbuflen = 0;
1206 } else if (x > 0) {
1207 char *p = socklist[i].handler.sock.outbuf;
1208
1209 /* This removes any sent bytes from the beginning of the buffer */
1210 socklist[i].handler.sock.outbuf = nmalloc(socklist[i].handler.sock.outbuflen - x);
1211 egg_memcpy(socklist[i].handler.sock.outbuf, p + x, socklist[i].handler.sock.outbuflen - x);
1212 socklist[i].handler.sock.outbuflen -= x;
1213 nfree(p);
1214 } else {
1215 debug3("dequeue_sockets(): errno = %d (%s) on %d", errno,
1216 strerror(errno), socklist[i].sock);
1217 }
1218 /* All queued data was sent. Call handler if one exists and the
1219 * dcc entry wants it.
1220 */
1221 if (!socklist[i].handler.sock.outbuf) {
1222 int idx = findanyidx(socklist[i].sock);
1223
1224 if (idx > 0 && dcc[idx].type && dcc[idx].type->outdone)
1225 dcc[idx].type->outdone(idx);
1226 }
1227 }
1228 }
1229 }
1230
1231
1232 /*
1233 * Debugging stuff
1234 */
1235
1236 void tell_netdebug(int idx)
1237 {
1238 int i;
1239 char s[80];
1240
1241 dprintf(idx, "Open sockets:");
1242 for (i = 0; i < threaddata()->MAXSOCKS; i++) {
1243 if (!(socklist[i].flags & SOCK_UNUSED)) {
1244 sprintf(s, " %d", socklist[i].sock);
1245 if (socklist[i].flags & SOCK_BINARY)
1246 strcat(s, " (binary)");
1247 if (socklist[i].flags & SOCK_LISTEN)
1248 strcat(s, " (listen)");
1249 if (socklist[i].flags & SOCK_PASS)
1250 strcat(s, " (passed on)");
1251 if (socklist[i].flags & SOCK_CONNECT)
1252 strcat(s, " (connecting)");
1253 if (socklist[i].flags & SOCK_STRONGCONN)
1254 strcat(s, " (strong)");
1255 if (socklist[i].flags & SOCK_NONSOCK)
1256 strcat(s, " (file)");
1257 #ifdef TLS
1258 if (socklist[i].ssl)
1259 strcat(s, " (TLS)");
1260 #endif
1261 if (socklist[i].flags & SOCK_TCL)
1262 strcat(s, " (tcl)");
1263 if (!(socklist[i].flags & SOCK_TCL)) {
1264 if (socklist[i].handler.sock.inbuf != NULL)
1265 sprintf(&s[strlen(s)], " (inbuf: %04X)",
1266 (unsigned int) strlen(socklist[i].handler.sock.inbuf));
1267 if (socklist[i].handler.sock.outbuf != NULL)
1268 sprintf(&s[strlen(s)], " (outbuf: %06lX)", socklist[i].handler.sock.outbuflen);
1269 }
1270 strcat(s, ",");
1271 dprintf(idx, "%s", s);
1272 }
1273 }
1274 dprintf(idx, " done.\n");
1275 }
1276
1277 /* Security-flavoured sanity checking on DCC connections of all sorts can be
1278 * done with this routine. Feed it the proper information from your DCC
1279 * before you attempt the connection, and this will make an attempt at
1280 * figuring out if the connection is really that person, or someone screwing
1281 * around. It's not foolproof, but anything that fails this check probably
1282 * isn't going to work anyway due to masquerading firewalls, NAT routers,
1283 * or bugs in mIRC.
1284 */
1285 int sanitycheck_dcc(char *nick, char *from, char *ipaddy, char *port)
1286 {
1287 /* According to the latest RFC, the clients SHOULD be able to handle
1288 * DNS names that are up to 255 characters long. This is not broken.
1289 */
1290
1291 #ifdef IPV6
1292 char badaddress[INET6_ADDRSTRLEN];
1293 sockname_t name;
1294 IP ip = 0;
1295 #else
1296 char badaddress[sizeof "255.255.255.255"];
1297 IP ip = my_atoul(ipaddy);
1298 #endif
1299 int prt = atoi(port);
1300
1301 /* It is disabled HERE so we only have to check in *one* spot! */
1302 if (!dcc_sanitycheck)
1303 return 1;
1304
1305 if (prt < 1) {
1306 putlog(LOG_MISC, "*", "ALERT: (%s!%s) specified an impossible port of %u!",
1307 nick, from, prt);
1308 return 0;
1309 }
1310 #ifdef IPV6
1311 if (strchr(ipaddy, ':')) {
1312 if (inet_pton(AF_INET6, ipaddy, &name.addr.s6.sin6_addr) != 1) {
1313 putlog(LOG_MISC, "*", "ALERT: (%s!%s) specified an invalid IPv6 "
1314 "address of %s!", nick, from, ipaddy);
1315 return 0;
1316 }
1317 if (IN6_IS_ADDR_V4MAPPED(&name.addr.s6.sin6_addr))
1318 ip = ntohl(*(IP *) &name.addr.s6.sin6_addr.s6_addr[12]);
1319 }
1320 #endif
1321 if (ip && inet_ntop(AF_INET, &ip, badaddress, sizeof badaddress) &&
1322 (ip < (1 << 24))) {
1323 putlog(LOG_MISC, "*", "ALERT: (%s!%s) specified an impossible IP of %s!",
1324 nick, from, badaddress);
1325 return 0;
1326 }
1327 return 1;
1328 }
1329
1330 int hostsanitycheck_dcc(char *nick, char *from, sockname_t *ip, char *dnsname,
1331 char *prt)
1332 {
1333 char badaddress[INET6_ADDRSTRLEN];
1334
1335 /* According to the latest RFC, the clients SHOULD be able to handle
1336 * DNS names that are up to 255 characters long. This is not broken.
1337 */
1338 char hostn[256];
1339
1340 /* It is disabled HERE so we only have to check in *one* spot! */
1341 if (!dcc_sanitycheck)
1342 return 1;
1343 strcpy(badaddress, iptostr(&ip->addr.sa));
1344 /* These should pad like crazy with zeros, since 120 bytes or so is
1345 * where the routines providing our data currently lose interest. I'm
1346 * using the n-variant in case someone changes that...
1347 */
1348 strncpyz(hostn, extracthostname(from), sizeof hostn);
1349 if (!egg_strcasecmp(hostn, dnsname)) {
1350 putlog(LOG_DEBUG, "*", "DNS information for submitted IP checks out.");
1351 return 1;
1352 }
1353 if (!strcmp(badaddress, dnsname))
1354 putlog(LOG_MISC, "*", "ALERT: (%s!%s) sent a DCC request with bogus IP "
1355 "information of %s port %s. %s does not resolve to %s!", nick, from,
1356 badaddress, prt, from, badaddress);
1357 else
1358 return 1; /* <- usually happens when we have
1359 * a user with an unresolved hostmask! */
1360 return 0;
1361 }
1362
1363 /* Checks wether the referenced socket has data queued.
1364 *
1365 * Returns true if the incoming/outgoing (depending on 'type') queues
1366 * contain data, otherwise false.
1367 */
1368 int sock_has_data(int type, int sock)
1369 {
1370 int ret = 0, i;
1371
1372 for (i = 0; i < threaddata()->MAXSOCKS; i++)
1373 if (!(socklist[i].flags & SOCK_UNUSED) && socklist[i].sock == sock)
1374 break;
1375 if (i < threaddata()->MAXSOCKS) {
1376 switch (type) {
1377 case SOCK_DATA_OUTGOING:
1378 ret = (socklist[i].handler.sock.outbuf != NULL);
1379 break;
1380 case SOCK_DATA_INCOMING:
1381 ret = (socklist[i].handler.sock.inbuf != NULL);
1382 break;
1383 }
1384 } else
1385 debug1("sock_has_data: could not find socket #%d, returning false.", sock);
1386 return ret;
1387 }
1388
1389 /* flush_inbuf():
1390 * checks if there's data in the incoming buffer of an connection
1391 * and flushs the buffer if possible
1392 *
1393 * returns: -1 if the dcc entry wasn't found
1394 * -2 if dcc[idx].type->activity doesn't exist and the data couldn't
1395 * be handled
1396 * 0 if buffer was empty
1397 * otherwise length of flushed buffer
1398 */
1399 int flush_inbuf(int idx)
1400 {
1401 int i, len;
1402 char *inbuf;
1403
1404 Assert((idx >= 0) && (idx < dcc_total));
1405 for (i = 0; i < threaddata()->MAXSOCKS; i++) {
1406 if ((dcc[idx].sock == socklist[i].sock) &&
1407 !(socklist[i].flags & SOCK_UNUSED)) {
1408 len = socklist[i].handler.sock.inbuflen;
1409 if ((len > 0) && socklist[i].handler.sock.inbuf) {
1410 if (dcc[idx].type && dcc[idx].type->activity) {
1411 inbuf = socklist[i].handler.sock.inbuf;
1412 socklist[i].handler.sock.inbuf = NULL;
1413 dcc[idx].type->activity(idx, inbuf, len);
1414 nfree(inbuf);
1415 return len;
1416 } else
1417 return -2;
1418 } else
1419 return 0;
1420 }
1421 }
1422 return -1;
1423 }
1424
1425 /* Find sock in socklist.
1426 *
1427 * Returns index in socklist or -1 if not found.
1428 */
1429 int findsock(int sock)
1430 {
1431 int i;
1432 struct threaddata *td = threaddata();
1433
1434 for (i = 0; i < td->MAXSOCKS; i++)
1435 if (td->socklist[i].sock == sock)
1436 break;
1437 if (i == td->MAXSOCKS)
1438 return -1;
1439 return i;
1440 }

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