/[cvs]/eggdrop1.8/src/net.c
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Revision 1.10 - (show annotations) (download) (as text)
Thu Feb 3 15:44:11 2011 UTC (8 years, 3 months ago) by pseudo
Branch: MAIN
Changes since 1.9: +92 -93 lines
File MIME type: text/x-chdr
Check for pending data on SSL sockets even when select reports the descriptor's not readable.
Allow moving write buffers for SSL sockets.

1 /*
2 * net.c -- handles:
3 * all raw network i/o
4 *
5 * $Id: net.c,v 1.9 2010/11/26 13:20:29 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 }
209
210 addr->family = addr->addr.s4.sin_family = AF_INET;
211 addr->addr.sa.sa_family = addr->family;
212 addr->addrlen = sizeof(struct sockaddr_in);
213 addr->addr.s4.sin_port = htons(port);
214 #endif
215 return af;
216 }
217
218 /* Get socket address to bind to for outbound connections
219 */
220 void getvhost(sockname_t *addr, int af)
221 {
222 char *h;
223
224 if (af == AF_INET)
225 h = vhost;
226 #ifdef IPV6
227 else
228 h = vhost6;
229 #endif
230 if (setsockname(addr, h, 0, 1) != af)
231 setsockname(addr, (af == AF_INET ? "0" : "::"), 0, 0);
232 /* Remember this 'self-lookup failed' thingie?
233 I have good news - you won't see it again ;) */
234 }
235
236 /* Sets/Unsets options for a specific socket.
237 *
238 * Returns: 0 - on success
239 * -1 - socket not found
240 * -2 - illegal operation
241 */
242 int sockoptions(int sock, int operation, int sock_options)
243 {
244 int i;
245 struct threaddata *td = threaddata();
246
247 for (i = 0; i < td->MAXSOCKS; i++)
248 if ((td->socklist[i].sock == sock) &&
249 !(td->socklist[i].flags & SOCK_UNUSED)) {
250 if (operation == EGG_OPTION_SET)
251 td->socklist[i].flags |= sock_options;
252 else if (operation == EGG_OPTION_UNSET)
253 td->socklist[i].flags &= ~sock_options;
254 else
255 return -2;
256 return 0;
257 }
258 return -1;
259 }
260
261 /* Return a free entry in the socket entry
262 */
263 int allocsock(int sock, int options)
264 {
265 int i;
266 struct threaddata *td = threaddata();
267
268 for (i = 0; i < td->MAXSOCKS; i++) {
269 if (td->socklist[i].flags & SOCK_UNUSED) {
270 /* yay! there is table space */
271 td->socklist[i].handler.sock.inbuf = NULL;
272 td->socklist[i].handler.sock.outbuf = NULL;
273 td->socklist[i].handler.sock.inbuflen = 0;
274 td->socklist[i].handler.sock.outbuflen = 0;
275 td->socklist[i].flags = options;
276 td->socklist[i].sock = sock;
277 #ifdef TLS
278 td->socklist[i].ssl = 0;
279 #endif
280 return i;
281 }
282 }
283 /* Try again if enlarging socketlist works */
284 if (increase_socks_max())
285 return -1;
286 else
287 return allocsock(sock, options);
288 }
289
290 /* Return a free entry in the socket entry for a tcl socket
291 *
292 * alloctclsock() can be called by Tcl threads
293 */
294 int alloctclsock(register int sock, int mask, Tcl_FileProc *proc, ClientData cd)
295 {
296 int f = -1;
297 register int i;
298 struct threaddata *td = threaddata();
299
300 for (i = 0; i < td->MAXSOCKS; i++) {
301 if (td->socklist[i].flags & SOCK_UNUSED) {
302 if (f == -1)
303 f = i;
304 } else if ((td->socklist[i].flags & SOCK_TCL) &&
305 td->socklist[i].sock == sock) {
306 f = i;
307 break;
308 }
309 }
310 if (f != -1) {
311 td->socklist[f].sock = sock;
312 td->socklist[f].flags = SOCK_TCL;
313 td->socklist[f].handler.tclsock.mask = mask;
314 td->socklist[f].handler.tclsock.proc = proc;
315 td->socklist[f].handler.tclsock.cd = cd;
316 return f;
317 }
318 /* Try again if enlarging socketlist works */
319 if (increase_socks_max())
320 return -1;
321 else
322 return alloctclsock(sock, mask, proc, cd);
323 }
324
325 /* Request a normal socket for i/o
326 */
327 void setsock(int sock, int options)
328 {
329 int i = allocsock(sock, options), parm;
330 struct threaddata *td = threaddata();
331
332 if (i == -1) {
333 putlog(LOG_MISC, "*", "Sockettable full.");
334 return;
335 }
336 if (((sock != STDOUT) || backgrd) && !(td->socklist[i].flags & SOCK_NONSOCK)) {
337 parm = 1;
338 setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (void *) &parm, sizeof(int));
339
340 parm = 0;
341 setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *) &parm, sizeof(int));
342 }
343 if (options & SOCK_LISTEN) {
344 /* Tris says this lets us grab the same port again next time */
345 parm = 1;
346 setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *) &parm, sizeof(int));
347 }
348 /* Yay async i/o ! */
349 fcntl(sock, F_SETFL, O_NONBLOCK);
350 }
351
352 int getsock(int af, int options)
353 {
354 int sock = socket(af, SOCK_STREAM, 0);
355
356 if (sock >= 0)
357 setsock(sock, options);
358 else
359 putlog(LOG_MISC, "*", "Warning: Can't create new socket: %s!",
360 strerror(errno));
361 return sock;
362 }
363
364 /* Done with a socket
365 */
366 void killsock(register int sock)
367 {
368 register int i;
369 struct threaddata *td = threaddata();
370
371 /* Ignore invalid sockets. */
372 if (sock < 0)
373 return;
374
375 for (i = 0; i < td->MAXSOCKS; i++) {
376 if ((td->socklist[i].sock == sock) && !(td->socklist[i].flags & SOCK_UNUSED)) {
377 if (!(td->socklist[i].flags & SOCK_TCL)) { /* nothing to free for tclsocks */
378 #ifdef TLS
379 if (td->socklist[i].ssl) {
380 SSL_shutdown(td->socklist[i].ssl);
381 nfree(SSL_get_app_data(td->socklist[i].ssl));
382 SSL_free(td->socklist[i].ssl);
383 td->socklist[i].ssl = NULL;
384 }
385 #endif
386 close(td->socklist[i].sock);
387 if (td->socklist[i].handler.sock.inbuf != NULL) {
388 nfree(td->socklist[i].handler.sock.inbuf);
389 td->socklist[i].handler.sock.inbuf = NULL;
390 }
391 if (td->socklist[i].handler.sock.outbuf != NULL) {
392 nfree(td->socklist[i].handler.sock.outbuf);
393 td->socklist[i].handler.sock.outbuf = NULL;
394 td->socklist[i].handler.sock.outbuflen = 0;
395 }
396 }
397 td->socklist[i].flags = SOCK_UNUSED;
398 return;
399 }
400 }
401 putlog(LOG_MISC, "*", "Warning: Attempt to kill un-allocated socket %d!", sock);
402 }
403
404 /* Done with a tcl socket
405 *
406 * killtclsock() can be called by Tcl threads
407 */
408 void killtclsock(register int sock)
409 {
410 register int i;
411 struct threaddata *td = threaddata();
412
413 if (sock < 0)
414 return;
415
416 for (i = 0; i < td->MAXSOCKS; i++) {
417 if ((td->socklist[i].flags & SOCK_TCL) && td->socklist[i].sock == sock) {
418 td->socklist[i].flags = SOCK_UNUSED;
419 return;
420 }
421 }
422 }
423
424 /* Send connection request to proxy
425 */
426 static int proxy_connect(int sock, sockname_t *addr)
427 {
428 sockname_t name;
429 char host[121], s[256];
430 int i, port, proxy;
431
432 if (!firewall[0])
433 return -2;
434 #ifdef IPV6
435 if (addr->family == AF_INET6) {
436 putlog(LOG_MISC, "*", "Eggdrop doesn't support IPv6 connections "
437 "through proxies yet.");
438 return -1;
439 }
440 #endif
441 if (firewall[0] == '!') {
442 proxy = PROXY_SUN;
443 strcpy(host, &firewall[1]);
444 } else {
445 proxy = PROXY_SOCKS;
446 strcpy(host, firewall);
447 }
448 port = addr->addr.s4.sin_port;
449 setsockname(&name, host, firewallport, 1);
450 if (connect(sock, &name.addr.sa, name.addrlen) < 0 && errno != EINPROGRESS)
451 return -1;
452 if (proxy == PROXY_SOCKS) {
453 for (i = 0; i < threaddata()->MAXSOCKS; i++)
454 if (!(socklist[i].flags & SOCK_UNUSED) && socklist[i].sock == sock)
455 socklist[i].flags |= SOCK_PROXYWAIT; /* drummer */
456 egg_memcpy(host, &addr->addr.s4.sin_addr.s_addr, 4);
457 egg_snprintf(s, sizeof s, "\004\001%c%c%c%c%c%c%s", port % 256,
458 (port >> 8) % 256, host[0], host[1], host[2], host[3], botuser);
459 tputs(sock, s, strlen(botuser) + 9); /* drummer */
460 } else if (proxy == PROXY_SUN) {
461 inet_ntop(AF_INET, &addr->addr.s4.sin_addr, host, sizeof host);
462 egg_snprintf(s, sizeof s, "%s %d\n", host, port);
463 tputs(sock, s, strlen(s)); /* drummer */
464 }
465 return sock;
466 }
467
468 /* Starts a connection attempt through a socket
469 *
470 * The server address should be filled in addr by setsockname() or by the
471 * non-blocking dns functions and setsnport().
472 *
473 * returns < 0 if connection refused:
474 * -1 strerror() type error
475 */
476 int open_telnet_raw(int sock, sockname_t *addr)
477 {
478 sockname_t name;
479 int i, rc;
480
481 getvhost(&name, addr->family);
482 if (bind(sock, &name.addr.sa, name.addrlen) < 0) {
483 return -1;
484 }
485 for (i = 0; i < threaddata()->MAXSOCKS; i++) {
486 if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].sock == sock))
487 socklist[i].flags = (socklist[i].flags & ~SOCK_VIRTUAL) | SOCK_CONNECT;
488 }
489 if (addr->family == AF_INET && firewall[0])
490 return proxy_connect(sock, addr);
491 rc = connect(sock, &addr->addr.sa, addr->addrlen);
492 if (rc < 0) {
493 if (errno == EINPROGRESS)
494 return sock; /* async success! */
495 else
496 return -1;
497 }
498 return sock;
499 }
500
501 /* Ordinary non-binary connection attempt
502 * Return values:
503 * >=0: connect successful, returned is the socket number
504 * -1: look at errno or use strerror()
505 * -2: lookup failed or server is not a valid IP string
506 * -3: could not allocate socket
507 */
508 int open_telnet(int idx, char *server, int port)
509 {
510 int ret;
511
512 ret = setsockname(&dcc[idx].sockname, server, port, 1);
513 if (ret == AF_UNSPEC)
514 return -2;
515 dcc[idx].port = port;
516 dcc[idx].sock = getsock(ret, 0);
517 if (dcc[idx].sock < 0)
518 return -3;
519 ret = open_telnet_raw(dcc[idx].sock, &dcc[idx].sockname);
520 if (ret < 0)
521 killsock(dcc[idx].sock);
522 return ret;
523 }
524
525 /* Returns a socket number for a listening socket that will accept any
526 * connection on the given address. The address can be filled in by
527 * setsockname().
528 */
529 int open_address_listen(sockname_t *addr)
530 {
531 int sock = 0;
532
533 sock = getsock(addr->family, SOCK_LISTEN);
534 if (sock < 0)
535 return -1;
536 #if defined IPV6 && IPV6_V6ONLY
537 if (addr->family == AF_INET6) {
538 int on = 0;
539 setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, (char *) &on, sizeof(on));
540 }
541 #endif
542 if (bind(sock, &addr->addr.sa, addr->addrlen) < 0) {
543 killsock(sock);
544 return -2;
545 }
546
547 if (getsockname(sock, &addr->addr.sa, &addr->addrlen) < 0) {
548 killsock(sock);
549 return -1;
550 }
551 if (listen(sock, 1) < 0) {
552 killsock(sock);
553 return -1;
554 }
555
556 return sock;
557 }
558
559 /* Returns a socket number for a listening socket that will accept any
560 * connection -- port # is returned in port
561 */
562 inline int open_listen(int *port)
563 {
564 int sock;
565 sockname_t name;
566
567 (void) setsockname(&name, listen_ip, *port, 1);
568 sock = open_address_listen(&name);
569 if (name.addr.sa.sa_family == AF_INET)
570 *port = ntohs(name.addr.s4.sin_port);
571 #ifdef IPV6
572 else
573 *port = ntohs(name.addr.s6.sin6_port);
574 #endif
575 return sock;
576 }
577
578 /* Short routine to answer a connect received on a listening socket.
579 * Returned is the new socket.
580 * If port is not NULL, it points to an integer to hold the port number
581 * of the caller.
582 */
583 int answer(int sock, sockname_t *caller, unsigned short *port, int binary)
584 {
585 int new_sock;
586 caller->addrlen = sizeof(caller->addr);
587 new_sock = accept(sock, &caller->addr.sa, &caller->addrlen);
588
589 if (new_sock < 0)
590 return -1;
591
592 caller->family = caller->addr.sa.sa_family;
593 if (port) {
594 if (caller->family == AF_INET)
595 *port = ntohs(caller->addr.s4.sin_port);
596 #ifdef IPV6
597 else
598 *port = ntohs(caller->addr.s6.sin6_port);
599 #endif
600 }
601 setsock(new_sock, (binary ? SOCK_BINARY : 0));
602 return new_sock;
603 }
604
605 /* Get DCC compatible address for a client to connect (e.g. 1660944385)
606 * If addr is not NULL, it should point to the listening socket's address.
607 * Otherwise, this function will try to figure out the public address of the
608 * machine, using listen_ip and natip.
609 * The result is a string useable for DCC requests
610 */
611 int getdccaddr(sockname_t *addr, char *s, size_t l)
612 {
613 char h[121];
614 sockname_t name, *r = &name;
615
616 if (addr)
617 r = addr;
618 else
619 setsockname(r, listen_ip, 0, 1);
620 if (
621 #ifdef IPV6
622 ((r->family == AF_INET6) &&
623 IN6_IS_ADDR_UNSPECIFIED(&r->addr.s6.sin6_addr)) ||
624 #endif
625 (r->family == AF_INET && !r->addr.s4.sin_addr.s_addr)) {
626 /* We can't send :: or 0.0.0.0 for dcc, so try
627 to figure out some real address */
628 r = &name;
629 gethostname(h, sizeof h);
630 setsockname(r, h, 0, 1);
631 }
632
633 if (
634 #ifdef IPV6
635 ((r->family == AF_INET6) &&
636 IN6_IS_ADDR_UNSPECIFIED(&r->addr.s6.sin6_addr)) ||
637 #endif
638 (!natip[0] && (r->family == AF_INET) && !r->addr.s4.sin_addr.s_addr))
639 return 0;
640
641 #ifdef IPV6
642 if (r->family == AF_INET6) {
643 if (IN6_IS_ADDR_V4MAPPED(&r->addr.s6.sin6_addr) ||
644 IN6_IS_ADDR_UNSPECIFIED(&r->addr.s6.sin6_addr))
645 snprintf(s, l, "%lu", natip[0] ? iptolong(inet_addr(natip)) :
646 ntohl(*(IP *) &r->addr.s6.sin6_addr.s6_addr[12]));
647 else
648 inet_ntop(AF_INET6, &r->addr.s6.sin6_addr, s, l);
649 } else
650 #endif
651 snprintf(s, l, "%lu", natip[0] ? iptolong(inet_addr(natip)) :
652 ntohl(r->addr.s4.sin_addr.s_addr));
653 return 1;
654 }
655
656 /* Builds the fd_sets for select(). Eggdrop only cares about readable
657 * sockets, but tcl also cares for writable/exceptions.
658 * preparefdset() can be called by Tcl Threads
659 */
660 int preparefdset(fd_set *fd, sock_list *slist, int slistmax, int tclonly, int tclmask)
661 {
662 int fdtmp, i, foundsocks = 0;
663
664 FD_ZERO(fd);
665 for (i = 0; i < slistmax; i++) {
666 if (!(slist[i].flags & (SOCK_UNUSED | SOCK_VIRTUAL))) {
667 if ((slist[i].sock == STDOUT) && !backgrd)
668 fdtmp = STDIN;
669 else
670 fdtmp = slist[i].sock;
671 /*
672 * Looks like that having more than a call, in the same
673 * program, to the FD_SET macro, triggers a bug in gcc.
674 * SIGBUS crashing binaries used to be produced on a number
675 * (prolly all?) of 64 bits architectures.
676 * Make your best to avoid to make it happen again.
677 *
678 * ITE
679 */
680 if (slist[i].flags & SOCK_TCL) {
681 if (!(slist[i].handler.tclsock.mask & tclmask))
682 continue;
683 } else if (tclonly)
684 continue;
685 foundsocks = 1;
686 FD_SET(fdtmp, fd);
687 }
688 }
689 return foundsocks;
690 }
691
692 /* Attempts to read from all sockets in slist (upper array boundary slistmax-1)
693 * fills s with up to 511 bytes if available, and returns the array index
694 * Also calls all handler procs for Tcl sockets
695 * sockread() can be called by Tcl threads
696 *
697 * on EOF: returns -1, with socket in len
698 * on socket error: returns -2
699 * if nothing is ready: returns -3
700 * tcl sockets busy: returns -5
701 */
702 int sockread(char *s, int *len, sock_list *slist, int slistmax, int tclonly)
703 {
704 struct timeval t;
705 fd_set fdr, fdw, fde;
706 int fds, i, x, have_r, have_w, have_e;
707 int grab = 511, tclsock = -1, events = 0;
708 struct threaddata *td = threaddata();
709
710 fds = getdtablesize();
711 #ifdef FD_SETSIZE
712 if (fds > FD_SETSIZE)
713 fds = FD_SETSIZE; /* Fixes YET ANOTHER freebsd bug!!! */
714 #endif
715
716 have_r = preparefdset(&fdr, slist, slistmax, tclonly, TCL_READABLE);
717 have_w = preparefdset(&fdw, slist, slistmax, 1, TCL_WRITABLE);
718 have_e = preparefdset(&fde, slist, slistmax, 1, TCL_EXCEPTION);
719
720 /* select() may modify the timeval argument - copy it */
721 t.tv_sec = td->blocktime.tv_sec;
722 t.tv_usec = td->blocktime.tv_usec;
723
724 x = select((SELECT_TYPE_ARG1) fds,
725 SELECT_TYPE_ARG234 (have_r ? &fdr : NULL),
726 SELECT_TYPE_ARG234 (have_w ? &fdw : NULL),
727 SELECT_TYPE_ARG234 (have_e ? &fde : NULL),
728 SELECT_TYPE_ARG5 &t);
729 if (x == -1)
730 return -2; /* socket error */
731
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 !SSL_is_init_finished(slist[i].ssl))) ||
738 #endif
739 ((slist[i].sock == STDOUT) && (!backgrd) &&
740 (FD_ISSET(STDIN, &fdr)))))) {
741 if (slist[i].flags & (SOCK_LISTEN | SOCK_CONNECT)) {
742 /* Listening socket -- don't read, just return activity */
743 /* Same for connection attempt */
744 /* (for strong connections, require a read to succeed first) */
745 if (slist[i].flags & SOCK_PROXYWAIT) /* drummer */
746 /* Hang around to get the return code from proxy */
747 grab = 10;
748 #ifdef TLS
749 else if (!(slist[i].flags & SOCK_STRONGCONN) &&
750 (!(slist[i].ssl) || SSL_is_init_finished(slist[i].ssl))) {
751 #else
752 else if (!(slist[i].flags & SOCK_STRONGCONN)) {
753 #endif
754 debug1("net: connect! sock %d", slist[i].sock);
755 s[0] = 0;
756 *len = 0;
757 return i;
758 }
759 } else if (slist[i].flags & SOCK_PASS) {
760 s[0] = 0;
761 *len = 0;
762 return i;
763 }
764 errno = 0;
765 if ((slist[i].sock == STDOUT) && !backgrd)
766 x = read(STDIN, s, grab);
767 else
768 #ifdef TLS
769 {
770 if (slist[i].ssl) {
771 x = SSL_read(slist[i].ssl, s, grab);
772 if (x < 0) {
773 int err = SSL_get_error(slist[i].ssl, x);
774 if (err == SSL_ERROR_WANT_READ || err == SSL_ERROR_WANT_WRITE)
775 errno = EAGAIN;
776 else
777 debug1("sockread(): SSL error = %s",
778 ERR_error_string(ERR_get_error(), 0));
779 x = -1;
780 }
781 } else
782 x = read(slist[i].sock, s, grab);
783 }
784 #else
785 x = read(slist[i].sock, s, grab);
786 #endif
787 if (x <= 0) { /* eof */
788 if (errno != EAGAIN) { /* EAGAIN happens when the operation would
789 * block on a non-blocking socket, if the
790 * socket is going to die, it will die later,
791 * otherwise it will connect. */
792 *len = slist[i].sock;
793 slist[i].flags &= ~SOCK_CONNECT;
794 debug1("net: eof!(read) socket %d", slist[i].sock);
795 return -1;
796 } else {
797 debug3("sockread EAGAIN: %d %d (%s)", slist[i].sock, errno,
798 strerror(errno));
799 continue; /* EAGAIN */
800 }
801 }
802 s[x] = 0;
803 *len = x;
804 if (slist[i].flags & SOCK_PROXYWAIT) {
805 debug2("net: socket: %d proxy errno: %d", slist[i].sock, s[1]);
806 slist[i].flags &= ~(SOCK_CONNECT | SOCK_PROXYWAIT);
807 switch (s[1]) {
808 case 90: /* Success */
809 s[0] = 0;
810 *len = 0;
811 return i;
812 case 91: /* Failed */
813 errno = ECONNREFUSED;
814 break;
815 case 92: /* No identd */
816 case 93: /* Identd said wrong username */
817 /* A better error message would be "socks misconfigured"
818 * or "identd not working" but this is simplest.
819 */
820 errno = ENETUNREACH;
821 break;
822 }
823 *len = slist[i].sock;
824 return -1;
825 }
826 return i;
827 } else if (tclsock == -1 && (slist[i].flags & SOCK_TCL)) {
828 events = FD_ISSET(slist[i].sock, &fdr) ? TCL_READABLE : 0;
829 events |= FD_ISSET(slist[i].sock, &fdw) ? TCL_WRITABLE : 0;
830 events |= FD_ISSET(slist[i].sock, &fde) ? TCL_EXCEPTION : 0;
831 events &= slist[i].handler.tclsock.mask;
832 if (events)
833 tclsock = i;
834 }
835 }
836 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("tputs(): SSL error = %s",
1101 ERR_error_string(ERR_get_error(), 0));
1102 inhere = 0;
1103 }
1104 x = -1;
1105 }
1106 } else /* not ssl, use regular write() */
1107 #endif
1108 /* Try. */
1109 x = write(z, s, len);
1110 if (x == -1)
1111 x = 0;
1112 if (x < len) {
1113 /* Socket is full, queue it */
1114 socklist[i].handler.sock.outbuf = nmalloc(len - x);
1115 egg_memcpy(socklist[i].handler.sock.outbuf, &s[x], len - x);
1116 socklist[i].handler.sock.outbuflen = len - x;
1117 }
1118 return;
1119 }
1120 }
1121 /* Make sure we don't cause a crash by looping here */
1122 if (!inhere) {
1123 inhere = 1;
1124
1125 putlog(LOG_MISC, "*", "!!! writing to nonexistent socket: %d", z);
1126 s[strlen(s) - 1] = 0;
1127 putlog(LOG_MISC, "*", "!-> '%s'", s);
1128
1129 inhere = 0;
1130 }
1131 }
1132
1133 /* tputs might queue data for sockets, let's dump as much of it as
1134 * possible.
1135 */
1136 void dequeue_sockets()
1137 {
1138 int i, x;
1139
1140 int z = 0, fds;
1141 fd_set wfds;
1142 struct timeval tv;
1143
1144 /* ^-- start poptix test code, this should avoid writes to sockets not ready to be written to. */
1145 fds = getdtablesize();
1146
1147 #ifdef FD_SETSIZE
1148 if (fds > FD_SETSIZE)
1149 fds = FD_SETSIZE; /* Fixes YET ANOTHER freebsd bug!!! */
1150 #endif
1151 FD_ZERO(&wfds);
1152 tv.tv_sec = 0;
1153 tv.tv_usec = 0; /* we only want to see if it's ready for writing, no need to actually wait.. */
1154 for (i = 0; i < threaddata()->MAXSOCKS; i++)
1155 if (!(socklist[i].flags & (SOCK_UNUSED | SOCK_TCL)) &&
1156 (socklist[i].handler.sock.outbuf != NULL)) {
1157 FD_SET(socklist[i].sock, &wfds);
1158 z = 1;
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("dequeue_sockets(): SSL error = %s",
1184 ERR_error_string(ERR_get_error(), 0));
1185 x = -1;
1186 }
1187 } else
1188 #endif
1189 x = write(socklist[i].sock, socklist[i].handler.sock.outbuf,
1190 socklist[i].handler.sock.outbuflen);
1191 if ((x < 0) && (errno != EAGAIN)
1192 #ifdef EBADSLT
1193 && (errno != EBADSLT)
1194 #endif
1195 #ifdef ENOTCONN
1196 && (errno != ENOTCONN)
1197 #endif
1198 ) {
1199 /* This detects an EOF during writing */
1200 debug3("net: eof!(write) socket %d (%s,%d)", socklist[i].sock,
1201 strerror(errno), errno);
1202 socklist[i].flags |= SOCK_EOFD;
1203 } else if (x == socklist[i].handler.sock.outbuflen) {
1204 /* If the whole buffer was sent, nuke it */
1205 nfree(socklist[i].handler.sock.outbuf);
1206 socklist[i].handler.sock.outbuf = NULL;
1207 socklist[i].handler.sock.outbuflen = 0;
1208 } else if (x > 0) {
1209 char *p = socklist[i].handler.sock.outbuf;
1210
1211 /* This removes any sent bytes from the beginning of the buffer */
1212 socklist[i].handler.sock.outbuf =
1213 nmalloc(socklist[i].handler.sock.outbuflen - x);
1214 egg_memcpy(socklist[i].handler.sock.outbuf, p + x,
1215 socklist[i].handler.sock.outbuflen - x);
1216 socklist[i].handler.sock.outbuflen -= x;
1217 nfree(p);
1218 } else {
1219 debug3("dequeue_sockets(): errno = %d (%s) on %d", errno,
1220 strerror(errno), socklist[i].sock);
1221 }
1222 /* All queued data was sent. Call handler if one exists and the
1223 * dcc entry wants it.
1224 */
1225 if (!socklist[i].handler.sock.outbuf) {
1226 int idx = findanyidx(socklist[i].sock);
1227
1228 if (idx > 0 && dcc[idx].type && dcc[idx].type->outdone)
1229 dcc[idx].type->outdone(idx);
1230 }
1231 }
1232 }
1233 }
1234
1235
1236 /*
1237 * Debugging stuff
1238 */
1239
1240 void tell_netdebug(int idx)
1241 {
1242 int i;
1243 char s[80];
1244
1245 dprintf(idx, "Open sockets:");
1246 for (i = 0; i < threaddata()->MAXSOCKS; i++) {
1247 if (!(socklist[i].flags & SOCK_UNUSED)) {
1248 sprintf(s, " %d", socklist[i].sock);
1249 if (socklist[i].flags & SOCK_BINARY)
1250 strcat(s, " (binary)");
1251 if (socklist[i].flags & SOCK_LISTEN)
1252 strcat(s, " (listen)");
1253 if (socklist[i].flags & SOCK_PASS)
1254 strcat(s, " (passed on)");
1255 if (socklist[i].flags & SOCK_CONNECT)
1256 strcat(s, " (connecting)");
1257 if (socklist[i].flags & SOCK_STRONGCONN)
1258 strcat(s, " (strong)");
1259 if (socklist[i].flags & SOCK_NONSOCK)
1260 strcat(s, " (file)");
1261 #ifdef TLS
1262 if (socklist[i].ssl)
1263 strcat(s, " (TLS)");
1264 #endif
1265 if (socklist[i].flags & SOCK_TCL)
1266 strcat(s, " (tcl)");
1267 if (!(socklist[i].flags & SOCK_TCL)) {
1268 if (socklist[i].handler.sock.inbuf != NULL)
1269 sprintf(&s[strlen(s)], " (inbuf: %04X)",
1270 (unsigned int) strlen(socklist[i].handler.sock.inbuf));
1271 if (socklist[i].handler.sock.outbuf != NULL)
1272 sprintf(&s[strlen(s)], " (outbuf: %06lX)", socklist[i].handler.sock.outbuflen);
1273 }
1274 strcat(s, ",");
1275 dprintf(idx, "%s", s);
1276 }
1277 }
1278 dprintf(idx, " done.\n");
1279 }
1280
1281 /* Security-flavoured sanity checking on DCC connections of all sorts can be
1282 * done with this routine. Feed it the proper information from your DCC
1283 * before you attempt the connection, and this will make an attempt at
1284 * figuring out if the connection is really that person, or someone screwing
1285 * around. It's not foolproof, but anything that fails this check probably
1286 * isn't going to work anyway due to masquerading firewalls, NAT routers,
1287 * or bugs in mIRC.
1288 */
1289 int sanitycheck_dcc(char *nick, char *from, char *ipaddy, char *port)
1290 {
1291 /* According to the latest RFC, the clients SHOULD be able to handle
1292 * DNS names that are up to 255 characters long. This is not broken.
1293 */
1294
1295 #ifdef IPV6
1296 char badaddress[INET6_ADDRSTRLEN];
1297 sockname_t name;
1298 IP ip = 0;
1299 #else
1300 char badaddress[sizeof "255.255.255.255"];
1301 IP ip = my_atoul(ipaddy);
1302 #endif
1303 int prt = atoi(port);
1304
1305 /* It is disabled HERE so we only have to check in *one* spot! */
1306 if (!dcc_sanitycheck)
1307 return 1;
1308
1309 if (prt < 1) {
1310 putlog(LOG_MISC, "*", "ALERT: (%s!%s) specified an impossible port of %u!",
1311 nick, from, prt);
1312 return 0;
1313 }
1314 #ifdef IPV6
1315 if (strchr(ipaddy, ':')) {
1316 if (inet_pton(AF_INET6, ipaddy, &name.addr.s6.sin6_addr) != 1) {
1317 putlog(LOG_MISC, "*", "ALERT: (%s!%s) specified an invalid IPv6 "
1318 "address of %s!", nick, from, ipaddy);
1319 return 0;
1320 }
1321 if (IN6_IS_ADDR_V4MAPPED(&name.addr.s6.sin6_addr))
1322 ip = ntohl(*(IP *) &name.addr.s6.sin6_addr.s6_addr[12]);
1323 }
1324 #endif
1325 if (ip && inet_ntop(AF_INET, &ip, badaddress, sizeof badaddress) &&
1326 (ip < (1 << 24))) {
1327 putlog(LOG_MISC, "*", "ALERT: (%s!%s) specified an impossible IP of %s!",
1328 nick, from, badaddress);
1329 return 0;
1330 }
1331 return 1;
1332 }
1333
1334 int hostsanitycheck_dcc(char *nick, char *from, sockname_t *ip, char *dnsname,
1335 char *prt)
1336 {
1337 char badaddress[INET6_ADDRSTRLEN];
1338
1339 /* According to the latest RFC, the clients SHOULD be able to handle
1340 * DNS names that are up to 255 characters long. This is not broken.
1341 */
1342 char hostn[256];
1343
1344 /* It is disabled HERE so we only have to check in *one* spot! */
1345 if (!dcc_sanitycheck)
1346 return 1;
1347 strcpy(badaddress, iptostr(&ip->addr.sa));
1348 /* These should pad like crazy with zeros, since 120 bytes or so is
1349 * where the routines providing our data currently lose interest. I'm
1350 * using the n-variant in case someone changes that...
1351 */
1352 strncpyz(hostn, extracthostname(from), sizeof hostn);
1353 if (!egg_strcasecmp(hostn, dnsname)) {
1354 putlog(LOG_DEBUG, "*", "DNS information for submitted IP checks out.");
1355 return 1;
1356 }
1357 if (!strcmp(badaddress, dnsname))
1358 putlog(LOG_MISC, "*", "ALERT: (%s!%s) sent a DCC request with bogus IP "
1359 "information of %s port %s. %s does not resolve to %s!", nick, from,
1360 badaddress, prt, from, badaddress);
1361 else
1362 return 1; /* <- usually happens when we have
1363 * a user with an unresolved hostmask! */
1364 return 0;
1365 }
1366
1367 /* Checks wether the referenced socket has data queued.
1368 *
1369 * Returns true if the incoming/outgoing (depending on 'type') queues
1370 * contain data, otherwise false.
1371 */
1372 int sock_has_data(int type, int sock)
1373 {
1374 int ret = 0, i;
1375
1376 for (i = 0; i < threaddata()->MAXSOCKS; i++)
1377 if (!(socklist[i].flags & SOCK_UNUSED) && socklist[i].sock == sock)
1378 break;
1379 if (i < threaddata()->MAXSOCKS) {
1380 switch (type) {
1381 case SOCK_DATA_OUTGOING:
1382 ret = (socklist[i].handler.sock.outbuf != NULL);
1383 break;
1384 case SOCK_DATA_INCOMING:
1385 ret = (socklist[i].handler.sock.inbuf != NULL);
1386 break;
1387 }
1388 } else
1389 debug1("sock_has_data: could not find socket #%d, returning false.", sock);
1390 return ret;
1391 }
1392
1393 /* flush_inbuf():
1394 * checks if there's data in the incoming buffer of an connection
1395 * and flushs the buffer if possible
1396 *
1397 * returns: -1 if the dcc entry wasn't found
1398 * -2 if dcc[idx].type->activity doesn't exist and the data couldn't
1399 * be handled
1400 * 0 if buffer was empty
1401 * otherwise length of flushed buffer
1402 */
1403 int flush_inbuf(int idx)
1404 {
1405 int i, len;
1406 char *inbuf;
1407
1408 Assert((idx >= 0) && (idx < dcc_total));
1409 for (i = 0; i < threaddata()->MAXSOCKS; i++) {
1410 if ((dcc[idx].sock == socklist[i].sock) &&
1411 !(socklist[i].flags & SOCK_UNUSED)) {
1412 len = socklist[i].handler.sock.inbuflen;
1413 if ((len > 0) && socklist[i].handler.sock.inbuf) {
1414 if (dcc[idx].type && dcc[idx].type->activity) {
1415 inbuf = socklist[i].handler.sock.inbuf;
1416 socklist[i].handler.sock.inbuf = NULL;
1417 dcc[idx].type->activity(idx, inbuf, len);
1418 nfree(inbuf);
1419 return len;
1420 } else
1421 return -2;
1422 } else
1423 return 0;
1424 }
1425 }
1426 return -1;
1427 }
1428
1429 /* Find sock in socklist.
1430 *
1431 * Returns index in socklist or -1 if not found.
1432 */
1433 int findsock(int sock)
1434 {
1435 int i;
1436 struct threaddata *td = threaddata();
1437
1438 for (i = 0; i < td->MAXSOCKS; i++)
1439 if (td->socklist[i].sock == sock)
1440 break;
1441 if (i == td->MAXSOCKS)
1442 return -1;
1443 return i;
1444 }

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