/[cvs]/eggdrop1.8/src/net.c
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Revision 1.5 - (hide annotations) (download) (as text)
Tue Oct 19 12:13:33 2010 UTC (8 years, 11 months ago) by pseudo
Branch: MAIN
Changes since 1.4: +93 -2 lines
File MIME type: text/x-chdr
Added full SSL support including Tcl commands.
Added support for certificate authentication.
Added support for botnet and partyline encryption using ssl.
Documented the new features and commands.
Fixed add_server() problems with IPv6 addresses in the server list.

1 simple 1.1 /*
2     * net.c -- handles:
3     * all raw network i/o
4     *
5 pseudo 1.5 * $Id: net.c,v 1.4 2010/09/14 19:45:29 pseudo Exp $
6 simple 1.1 */
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 pseudo 1.5 #ifdef TLS
48     # include <openssl/err.h>
49     #endif
50    
51 simple 1.1 #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 pseudo 1.2 char natip[121] = ""; /* Public IPv4 to report for systems behind NAT */
66     char listen_ip[121] = ""; /* IP (or hostname) for listening sockets */
67 pseudo 1.3 char vhost[121] = ""; /* IPv4 vhost for outgoing connections */
68 pseudo 1.2 #ifdef IPV6
69 pseudo 1.3 char vhost6[121] = ""; /* IPv6 vhost for outgoing connections */
70 pseudo 1.2 int pref_af = 0; /* Prefer IPv6 over IPv4? */
71     #endif
72 simple 1.1 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 pseudo 1.2 /* 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 simple 1.1 */
140 pseudo 1.2 int setsockname(sockname_t *addr, char *src, int port, int allowres)
141 simple 1.1 {
142     struct hostent *hp;
143 pseudo 1.2 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 pseudo 1.4 } else
209     af = AF_INET;
210 pseudo 1.2
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 simple 1.1 #endif
216 pseudo 1.2 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 simple 1.1 #endif
231 pseudo 1.2 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 simple 1.1 }
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 pseudo 1.5 #ifdef TLS
279     td->socklist[i].ssl = 0;
280     #endif
281 simple 1.1 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 pseudo 1.2 int getsock(int af, int options)
354 simple 1.1 {
355 pseudo 1.2 int sock = socket(af, SOCK_STREAM, 0);
356    
357 simple 1.1 if (sock >= 0)
358     setsock(sock, options);
359     else
360 pseudo 1.2 putlog(LOG_MISC, "*", "Warning: Can't create new socket: %s!",
361     strerror(errno));
362 simple 1.1 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 pseudo 1.5 #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 simple 1.1 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 pseudo 1.2 static int proxy_connect(int sock, sockname_t *addr)
428 simple 1.1 {
429 pseudo 1.2 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 simple 1.1 if (proxy == PROXY_SOCKS) {
454 pseudo 1.2 for (i = 0; i < threaddata()->MAXSOCKS; i++)
455 simple 1.1 if (!(socklist[i].flags & SOCK_UNUSED) && socklist[i].sock == sock)
456     socklist[i].flags |= SOCK_PROXYWAIT; /* drummer */
457 pseudo 1.2 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 simple 1.1 tputs(sock, s, strlen(botuser) + 9); /* drummer */
461     } else if (proxy == PROXY_SUN) {
462 pseudo 1.2 inet_ntop(AF_INET, &addr->addr.s4.sin_addr, host, sizeof host);
463 simple 1.1 egg_snprintf(s, sizeof s, "%s %d\n", host, port);
464     tputs(sock, s, strlen(s)); /* drummer */
465     }
466     return sock;
467     }
468    
469 pseudo 1.2 /* Starts a connection attempt through a socket
470 simple 1.1 *
471 pseudo 1.2 * The server address should be filled in addr by setsockname() or by the
472     * non-blocking dns functions and setsnport().
473 simple 1.1 *
474 pseudo 1.2 * returns < 0 if connection refused:
475     * -1 strerror() type error
476 simple 1.1 */
477 pseudo 1.2 int open_telnet_raw(int sock, sockname_t *addr)
478 simple 1.1 {
479 pseudo 1.2 sockname_t name;
480     int i, rc;
481    
482     getvhost(&name, addr->family);
483     if (bind(sock, &name.addr.sa, name.addrlen) < 0) {
484 simple 1.1 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 pseudo 1.2 if (addr->family == AF_INET && firewall[0])
491     return proxy_connect(sock, addr);
492     rc = connect(sock, &addr->addr.sa, addr->addrlen);
493 simple 1.1 if (rc < 0) {
494 pseudo 1.2 if (errno == EINPROGRESS)
495 simple 1.1 return sock; /* async success! */
496 pseudo 1.2 else
497 simple 1.1 return -1;
498     }
499     return sock;
500     }
501    
502 pseudo 1.2 /* 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     */
508 simple 1.1 int open_telnet(char *server, int port)
509     {
510 pseudo 1.2 int ret, sock;
511     sockname_t name;
512    
513     ret = setsockname(&name, server, port, 1);
514     if (ret == AF_UNSPEC)
515     return -2;
516     sock = getsock(ret, 0);
517     if (sock < 0)
518     return -1;
519     ret = open_telnet_raw(sock, &name);
520     if (ret < 0)
521     killsock(sock);
522 simple 1.1 return ret;
523     }
524    
525     /* Returns a socket number for a listening socket that will accept any
526 pseudo 1.2 * connection on the given address. The address can be filled in by
527     * setsockname().
528 simple 1.1 */
529 pseudo 1.2 int open_address_listen(sockname_t *addr)
530     {
531 simple 1.1 int sock = 0;
532    
533 pseudo 1.2 sock = getsock(addr->family, SOCK_LISTEN);
534     if (sock < 0)
535 simple 1.1 return -1;
536 pseudo 1.2 #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 simple 1.1 }
546    
547 pseudo 1.2 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 simple 1.1 }
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 pseudo 1.2 int sock;
565     sockname_t name;
566 simple 1.1
567 pseudo 1.2 (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 simple 1.1 }
577    
578 pseudo 1.2 /* 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 simple 1.1 */
583 pseudo 1.2 int answer(int sock, sockname_t *caller, unsigned short *port, int binary)
584 simple 1.1 {
585     int new_sock;
586 pseudo 1.2 caller->addrlen = sizeof(caller->addr);
587     new_sock = accept(sock, &caller->addr.sa, &caller->addrlen);
588    
589 simple 1.1 if (new_sock < 0)
590     return -1;
591 pseudo 1.2
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 simple 1.1 setsock(new_sock, (binary ? SOCK_BINARY : 0));
602     return new_sock;
603     }
604    
605 pseudo 1.2 /* 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 simple 1.1 */
611 pseudo 1.2 int getdccaddr(sockname_t *addr, char *s, size_t l)
612 simple 1.1 {
613 pseudo 1.2 char h[121];
614     sockname_t name, *r = &name;
615 simple 1.1
616 pseudo 1.2 if (addr)
617     r = addr;
618 simple 1.1 else
619 pseudo 1.2 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 pseudo 1.3 ntohl(*(IP *) &r->addr.s6.sin6_addr.s6_addr[12]));
647 pseudo 1.2 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 simple 1.1 }
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 > 0) {
730     /* Something happened */
731     for (i = 0; i < slistmax; i++) {
732     if (!tclonly && ((!(slist[i].flags & (SOCK_UNUSED | SOCK_TCL))) &&
733     ((FD_ISSET(slist[i].sock, &fdr)) ||
734 pseudo 1.5 #ifdef TLS
735     (slist[i].ssl && SSL_pending(slist[i].ssl)) ||
736     #endif
737 simple 1.1 ((slist[i].sock == STDOUT) && (!backgrd) &&
738     (FD_ISSET(STDIN, &fdr)))))) {
739     if (slist[i].flags & (SOCK_LISTEN | SOCK_CONNECT)) {
740     /* Listening socket -- don't read, just return activity */
741     /* Same for connection attempt */
742     /* (for strong connections, require a read to succeed first) */
743     if (slist[i].flags & SOCK_PROXYWAIT) /* drummer */
744     /* Hang around to get the return code from proxy */
745     grab = 10;
746 pseudo 1.5 #ifdef TLS
747     else if (!(slist[i].flags & SOCK_STRONGCONN) &&
748     (!(slist[i].ssl) || !SSL_in_init(slist[i].ssl))) {
749     #else
750 simple 1.1 else if (!(slist[i].flags & SOCK_STRONGCONN)) {
751 pseudo 1.5 #endif
752 simple 1.1 debug1("net: connect! sock %d", slist[i].sock);
753     s[0] = 0;
754     *len = 0;
755     return i;
756     }
757     } else if (slist[i].flags & SOCK_PASS) {
758     s[0] = 0;
759     *len = 0;
760     return i;
761     }
762     errno = 0;
763     if ((slist[i].sock == STDOUT) && !backgrd)
764     x = read(STDIN, s, grab);
765     else
766 pseudo 1.5 #ifdef TLS
767     {
768     if (slist[i].ssl) {
769     x = SSL_read(slist[i].ssl, s, grab);
770     if (x < 0) {
771     int err = SSL_get_error(slist[i].ssl, x);
772     if (err == SSL_ERROR_WANT_READ || err == SSL_ERROR_WANT_WRITE)
773     errno = EAGAIN;
774     else
775     debug1("SSL error: %s", ERR_error_string(ERR_get_error(), 0));
776     x = -1;
777     }
778     } else
779     x = read(slist[i].sock, s, grab);
780     }
781     #else
782     x = read(slist[i].sock, s, grab);
783     #endif
784 simple 1.1 if (x <= 0) { /* eof */
785     if (errno != EAGAIN) { /* EAGAIN happens when the operation would
786     * block on a non-blocking socket, if the
787     * socket is going to die, it will die later,
788     * otherwise it will connect. */
789     *len = slist[i].sock;
790     slist[i].flags &= ~SOCK_CONNECT;
791     debug1("net: eof!(read) socket %d", slist[i].sock);
792     return -1;
793     } else {
794     debug3("sockread EAGAIN: %d %d (%s)", slist[i].sock, errno,
795     strerror(errno));
796     continue; /* EAGAIN */
797     }
798     }
799     s[x] = 0;
800     *len = x;
801     if (slist[i].flags & SOCK_PROXYWAIT) {
802     debug2("net: socket: %d proxy errno: %d", slist[i].sock, s[1]);
803     slist[i].flags &= ~(SOCK_CONNECT | SOCK_PROXYWAIT);
804     switch (s[1]) {
805     case 90: /* Success */
806     s[0] = 0;
807     *len = 0;
808     return i;
809     case 91: /* Failed */
810     errno = ECONNREFUSED;
811     break;
812     case 92: /* No identd */
813     case 93: /* Identd said wrong username */
814     /* A better error message would be "socks misconfigured"
815     * or "identd not working" but this is simplest.
816     */
817     errno = ENETUNREACH;
818     break;
819     }
820     *len = slist[i].sock;
821     return -1;
822     }
823     return i;
824     } else if (tclsock == -1 && (slist[i].flags & SOCK_TCL)) {
825     events = FD_ISSET(slist[i].sock, &fdr) ? TCL_READABLE : 0;
826     events |= FD_ISSET(slist[i].sock, &fdw) ? TCL_WRITABLE : 0;
827     events |= FD_ISSET(slist[i].sock, &fde) ? TCL_EXCEPTION : 0;
828     events &= slist[i].handler.tclsock.mask;
829     if (events)
830     tclsock = i;
831     }
832     }
833     } else if (x == -1)
834     return -2; /* socket error */
835     else if (!tclonly) {
836     s[0] = 0;
837     *len = 0;
838     }
839     if (tclsock != -1) {
840     (*slist[tclsock].handler.tclsock.proc)(slist[tclsock].handler.tclsock.cd,
841     events);
842     return -5;
843     }
844     return -3;
845     }
846    
847     /* sockgets: buffer and read from sockets
848     *
849     * Attempts to read from all registered sockets for up to one second. if
850     * after one second, no complete data has been received from any of the
851     * sockets, 's' will be empty, 'len' will be 0, and sockgets will return -3.
852     * if there is returnable data received from a socket, the data will be
853     * in 's' (null-terminated if non-binary), the length will be returned
854     * in len, and the socket number will be returned.
855     * normal sockets have their input buffered, and each call to sockgets
856     * will return one line terminated with a '\n'. binary sockets are not
857     * buffered and return whatever coems in as soon as it arrives.
858     * listening sockets will return an empty string when a connection comes in.
859     * connecting sockets will return an empty string on a successful connect,
860     * or EOF on a failed connect.
861     * if an EOF is detected from any of the sockets, that socket number will be
862     * put in len, and -1 will be returned.
863     * the maximum length of the string returned is 512 (including null)
864     *
865     * Returns -4 if we handled something that shouldn't be handled by the
866     * dcc functions. Simply ignore it.
867     * Returns -5 if tcl sockets are busy but not eggdrop sockets.
868     */
869    
870     int sockgets(char *s, int *len)
871     {
872     char xx[514], *p, *px;
873     int ret, i, data = 0;
874    
875     for (i = 0; i < threaddata()->MAXSOCKS; i++) {
876     /* Check for stored-up data waiting to be processed */
877     if (!(socklist[i].flags & (SOCK_UNUSED | SOCK_TCL | SOCK_BUFFER)) &&
878     (socklist[i].handler.sock.inbuf != NULL)) {
879     if (!(socklist[i].flags & SOCK_BINARY)) {
880     /* look for \r too cos windows can't follow RFCs */
881     p = strchr(socklist[i].handler.sock.inbuf, '\n');
882     if (p == NULL)
883     p = strchr(socklist[i].handler.sock.inbuf, '\r');
884     if (p != NULL) {
885     *p = 0;
886     if (strlen(socklist[i].handler.sock.inbuf) > 510)
887     socklist[i].handler.sock.inbuf[510] = 0;
888     strcpy(s, socklist[i].handler.sock.inbuf);
889     px = nmalloc(strlen(p + 1) + 1);
890     strcpy(px, p + 1);
891     nfree(socklist[i].handler.sock.inbuf);
892     if (px[0])
893     socklist[i].handler.sock.inbuf = px;
894     else {
895     nfree(px);
896     socklist[i].handler.sock.inbuf = NULL;
897     }
898     /* Strip CR if this was CR/LF combo */
899     if (s[strlen(s) - 1] == '\r')
900     s[strlen(s) - 1] = 0;
901     *len = strlen(s);
902     return socklist[i].sock;
903     }
904     } else {
905     /* Handling buffered binary data (must have been SOCK_BUFFER before). */
906     if (socklist[i].handler.sock.inbuflen <= 510) {
907     *len = socklist[i].handler.sock.inbuflen;
908     egg_memcpy(s, socklist[i].handler.sock.inbuf, socklist[i].handler.sock.inbuflen);
909     nfree(socklist[i].handler.sock.inbuf);
910     socklist[i].handler.sock.inbuf = NULL;
911     socklist[i].handler.sock.inbuflen = 0;
912     } else {
913     /* Split up into chunks of 510 bytes. */
914     *len = 510;
915     egg_memcpy(s, socklist[i].handler.sock.inbuf, *len);
916     egg_memcpy(socklist[i].handler.sock.inbuf, socklist[i].handler.sock.inbuf + *len, *len);
917     socklist[i].handler.sock.inbuflen -= *len;
918     socklist[i].handler.sock.inbuf = nrealloc(socklist[i].handler.sock.inbuf, socklist[i].handler.sock.inbuflen);
919     }
920     return socklist[i].sock;
921     }
922     }
923     /* Also check any sockets that might have EOF'd during write */
924     if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].flags & SOCK_EOFD)) {
925     s[0] = 0;
926     *len = socklist[i].sock;
927     return -1;
928     }
929     }
930     /* No pent-up data of any worth -- down to business */
931     *len = 0;
932     ret = sockread(xx, len, socklist, threaddata()->MAXSOCKS, 0);
933     if (ret < 0) {
934     s[0] = 0;
935     return ret;
936     }
937     /* Binary, listening and passed on sockets don't get buffered. */
938     if (socklist[ret].flags & SOCK_CONNECT) {
939     if (socklist[ret].flags & SOCK_STRONGCONN) {
940     socklist[ret].flags &= ~SOCK_STRONGCONN;
941     /* Buffer any data that came in, for future read. */
942     socklist[ret].handler.sock.inbuflen = *len;
943     socklist[ret].handler.sock.inbuf = nmalloc(*len + 1);
944     /* It might be binary data. You never know. */
945     egg_memcpy(socklist[ret].handler.sock.inbuf, xx, *len);
946     socklist[ret].handler.sock.inbuf[*len] = 0;
947     }
948     socklist[ret].flags &= ~SOCK_CONNECT;
949     s[0] = 0;
950     return socklist[ret].sock;
951     }
952     if (socklist[ret].flags & SOCK_BINARY) {
953     egg_memcpy(s, xx, *len);
954     return socklist[ret].sock;
955     }
956     if (socklist[ret].flags & (SOCK_LISTEN | SOCK_PASS | SOCK_TCL)) {
957     s[0] = 0; /* for the dcc traffic counters in the mainloop */
958     return socklist[ret].sock;
959     }
960     if (socklist[ret].flags & SOCK_BUFFER) {
961     socklist[ret].handler.sock.inbuf = (char *) nrealloc(socklist[ret].handler.sock.inbuf,
962     socklist[ret].handler.sock.inbuflen + *len + 1);
963     egg_memcpy(socklist[ret].handler.sock.inbuf + socklist[ret].handler.sock.inbuflen, xx, *len);
964     socklist[ret].handler.sock.inbuflen += *len;
965     /* We don't know whether it's binary data. Make sure normal strings
966     * will be handled properly later on too. */
967     socklist[ret].handler.sock.inbuf[socklist[ret].handler.sock.inbuflen] = 0;
968     return -4; /* Ignore this one. */
969     }
970     /* Might be necessary to prepend stored-up data! */
971     if (socklist[ret].handler.sock.inbuf != NULL) {
972     p = socklist[ret].handler.sock.inbuf;
973     socklist[ret].handler.sock.inbuf = nmalloc(strlen(p) + strlen(xx) + 1);
974     strcpy(socklist[ret].handler.sock.inbuf, p);
975     strcat(socklist[ret].handler.sock.inbuf, xx);
976     nfree(p);
977     if (strlen(socklist[ret].handler.sock.inbuf) < 512) {
978     strcpy(xx, socklist[ret].handler.sock.inbuf);
979     nfree(socklist[ret].handler.sock.inbuf);
980     socklist[ret].handler.sock.inbuf = NULL;
981     socklist[ret].handler.sock.inbuflen = 0;
982     } else {
983     p = socklist[ret].handler.sock.inbuf;
984     socklist[ret].handler.sock.inbuflen = strlen(p) - 510;
985     socklist[ret].handler.sock.inbuf = nmalloc(socklist[ret].handler.sock.inbuflen + 1);
986     strcpy(socklist[ret].handler.sock.inbuf, p + 510);
987     *(p + 510) = 0;
988     strcpy(xx, p);
989     nfree(p);
990     /* (leave the rest to be post-pended later) */
991     }
992     }
993     /* Look for EOL marker; if it's there, i have something to show */
994     p = strchr(xx, '\n');
995     if (p == NULL)
996     p = strchr(xx, '\r');
997     if (p != NULL) {
998     *p = 0;
999     strcpy(s, xx);
1000     memmove(xx, p + 1, strlen(p + 1) + 1);
1001     if (s[strlen(s) - 1] == '\r')
1002     s[strlen(s) - 1] = 0;
1003     data = 1; /* DCC_CHAT may now need to process a blank line */
1004     /* NO! */
1005     /* if (!s[0]) strcpy(s," "); */
1006     } else {
1007     s[0] = 0;
1008     if (strlen(xx) >= 510) {
1009     /* String is too long, so just insert fake \n */
1010     strcpy(s, xx);
1011     xx[0] = 0;
1012     data = 1;
1013     }
1014     }
1015     *len = strlen(s);
1016     /* Anything left that needs to be saved? */
1017     if (!xx[0]) {
1018     if (data)
1019     return socklist[ret].sock;
1020     else
1021     return -3;
1022     }
1023     /* Prepend old data back */
1024     if (socklist[ret].handler.sock.inbuf != NULL) {
1025     p = socklist[ret].handler.sock.inbuf;
1026     socklist[ret].handler.sock.inbuflen = strlen(p) + strlen(xx);
1027     socklist[ret].handler.sock.inbuf = nmalloc(socklist[ret].handler.sock.inbuflen + 1);
1028     strcpy(socklist[ret].handler.sock.inbuf, xx);
1029     strcat(socklist[ret].handler.sock.inbuf, p);
1030     nfree(p);
1031     } else {
1032     socklist[ret].handler.sock.inbuflen = strlen(xx);
1033     socklist[ret].handler.sock.inbuf = nmalloc(socklist[ret].handler.sock.inbuflen + 1);
1034     strcpy(socklist[ret].handler.sock.inbuf, xx);
1035     }
1036     if (data)
1037     return socklist[ret].sock;
1038     else
1039     return -3;
1040     }
1041    
1042     /* Dump something to a socket
1043     *
1044     * NOTE: Do NOT put Contexts in here if you want DEBUG to be meaningful!!
1045     */
1046     void tputs(register int z, char *s, unsigned int len)
1047     {
1048     register int i, x, idx;
1049     char *p;
1050     static int inhere = 0;
1051    
1052     if (z < 0) /* um... HELLO?! sanity check please! */
1053     return;
1054    
1055     if (((z == STDOUT) || (z == STDERR)) && (!backgrd || use_stderr)) {
1056     write(z, s, len);
1057     return;
1058     }
1059    
1060     for (i = 0; i < threaddata()->MAXSOCKS; i++) {
1061     if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].sock == z)) {
1062     for (idx = 0; idx < dcc_total; idx++) {
1063     if ((dcc[idx].sock == z) && dcc[idx].type && dcc[idx].type->name) {
1064     if (!strncmp(dcc[idx].type->name, "BOT", 3))
1065     otraffic_bn_today += len;
1066     else if (!strcmp(dcc[idx].type->name, "SERVER"))
1067     otraffic_irc_today += len;
1068     else if (!strncmp(dcc[idx].type->name, "CHAT", 4))
1069     otraffic_dcc_today += len;
1070     else if (!strncmp(dcc[idx].type->name, "FILES", 5))
1071     otraffic_filesys_today += len;
1072     else if (!strcmp(dcc[idx].type->name, "SEND"))
1073     otraffic_trans_today += len;
1074     else if (!strncmp(dcc[idx].type->name, "GET", 3))
1075     otraffic_trans_today += len;
1076     else
1077     otraffic_unknown_today += len;
1078     break;
1079     }
1080     }
1081    
1082     if (socklist[i].handler.sock.outbuf != NULL) {
1083     /* Already queueing: just add it */
1084     p = (char *) nrealloc(socklist[i].handler.sock.outbuf, socklist[i].handler.sock.outbuflen + len);
1085     egg_memcpy(p + socklist[i].handler.sock.outbuflen, s, len);
1086     socklist[i].handler.sock.outbuf = p;
1087     socklist[i].handler.sock.outbuflen += len;
1088     return;
1089     }
1090 pseudo 1.5 #ifdef TLS
1091     if (socklist[i].ssl) {
1092     x = SSL_write(socklist[i].ssl, s, len);
1093     if (x < 0) {
1094     int err = SSL_get_error(socklist[i].ssl, x);
1095     if (err == SSL_ERROR_WANT_WRITE || err == SSL_ERROR_WANT_READ)
1096     errno = EAGAIN;
1097     else if (!inhere) { /* Out there, somewhere */
1098     inhere = 1;
1099     debug1("SSL error: %s", ERR_error_string(ERR_get_error(), 0));
1100     inhere = 0;
1101     }
1102     x = -1;
1103     }
1104     } else /* not ssl, use regular write() */
1105     #endif
1106 simple 1.1 /* Try. */
1107     x = write(z, s, len);
1108     if (x == -1)
1109     x = 0;
1110     if (x < len) {
1111     /* Socket is full, queue it */
1112     socklist[i].handler.sock.outbuf = nmalloc(len - x);
1113     egg_memcpy(socklist[i].handler.sock.outbuf, &s[x], len - x);
1114     socklist[i].handler.sock.outbuflen = len - x;
1115     }
1116     return;
1117     }
1118     }
1119     /* Make sure we don't cause a crash by looping here */
1120     if (!inhere) {
1121     inhere = 1;
1122    
1123     putlog(LOG_MISC, "*", "!!! writing to nonexistent socket: %d", z);
1124     s[strlen(s) - 1] = 0;
1125     putlog(LOG_MISC, "*", "!-> '%s'", s);
1126    
1127     inhere = 0;
1128     }
1129     }
1130    
1131     /* tputs might queue data for sockets, let's dump as much of it as
1132     * possible.
1133     */
1134     void dequeue_sockets()
1135     {
1136     int i, x;
1137    
1138     int z = 0, fds;
1139     fd_set wfds;
1140     struct timeval tv;
1141    
1142     /* ^-- start poptix test code, this should avoid writes to sockets not ready to be written to. */
1143     fds = getdtablesize();
1144    
1145     #ifdef FD_SETSIZE
1146     if (fds > FD_SETSIZE)
1147     fds = FD_SETSIZE; /* Fixes YET ANOTHER freebsd bug!!! */
1148     #endif
1149     FD_ZERO(&wfds);
1150     tv.tv_sec = 0;
1151     tv.tv_usec = 0; /* we only want to see if it's ready for writing, no need to actually wait.. */
1152     for (i = 0; i < threaddata()->MAXSOCKS; i++) {
1153     if (!(socklist[i].flags & (SOCK_UNUSED | SOCK_TCL)) &&
1154     socklist[i].handler.sock.outbuf != NULL) {
1155     FD_SET(socklist[i].sock, &wfds);
1156     z = 1;
1157     }
1158     }
1159     if (!z)
1160     return; /* nothing to write */
1161    
1162     select((SELECT_TYPE_ARG1) fds, SELECT_TYPE_ARG234 NULL,
1163     SELECT_TYPE_ARG234 &wfds, SELECT_TYPE_ARG234 NULL,
1164     SELECT_TYPE_ARG5 &tv);
1165    
1166     /* end poptix */
1167    
1168     for (i = 0; i < threaddata()->MAXSOCKS; i++) {
1169     if (!(socklist[i].flags & (SOCK_UNUSED | SOCK_TCL)) &&
1170     (socklist[i].handler.sock.outbuf != NULL) && (FD_ISSET(socklist[i].sock, &wfds))) {
1171     /* Trick tputs into doing the work */
1172     errno = 0;
1173 pseudo 1.5 #ifdef TLS
1174     if (socklist[i].ssl) {
1175     x = SSL_write(socklist[i].ssl, socklist[i].handler.sock.outbuf,
1176     socklist[i].handler.sock.outbuflen);
1177     if (x < 0) {
1178     int err = SSL_get_error(socklist[i].ssl, x);
1179     if (err == SSL_ERROR_WANT_WRITE || err == SSL_ERROR_WANT_READ)
1180     errno = EAGAIN;
1181     else
1182     debug1("SSL error: %s", ERR_error_string(ERR_get_error(), 0));
1183     x = -1;
1184     }
1185     } else
1186     #endif
1187 simple 1.1 x = write(socklist[i].sock, socklist[i].handler.sock.outbuf, socklist[i].handler.sock.outbuflen);
1188     if ((x < 0) && (errno != EAGAIN)
1189     #ifdef EBADSLT
1190     && (errno != EBADSLT)
1191     #endif
1192     #ifdef ENOTCONN
1193     && (errno != ENOTCONN)
1194     #endif
1195     ) {
1196     /* This detects an EOF during writing */
1197     debug3("net: eof!(write) socket %d (%s,%d)", socklist[i].sock,
1198     strerror(errno), errno);
1199     socklist[i].flags |= SOCK_EOFD;
1200     } else if (x == socklist[i].handler.sock.outbuflen) {
1201     /* If the whole buffer was sent, nuke it */
1202     nfree(socklist[i].handler.sock.outbuf);
1203     socklist[i].handler.sock.outbuf = NULL;
1204     socklist[i].handler.sock.outbuflen = 0;
1205     } else if (x > 0) {
1206     char *p = socklist[i].handler.sock.outbuf;
1207    
1208     /* This removes any sent bytes from the beginning of the buffer */
1209     socklist[i].handler.sock.outbuf = nmalloc(socklist[i].handler.sock.outbuflen - x);
1210     egg_memcpy(socklist[i].handler.sock.outbuf, p + x, socklist[i].handler.sock.outbuflen - x);
1211     socklist[i].handler.sock.outbuflen -= x;
1212     nfree(p);
1213     } else {
1214     debug3("dequeue_sockets(): errno = %d (%s) on %d", errno,
1215     strerror(errno), socklist[i].sock);
1216     }
1217     /* All queued data was sent. Call handler if one exists and the
1218     * dcc entry wants it.
1219     */
1220     if (!socklist[i].handler.sock.outbuf) {
1221     int idx = findanyidx(socklist[i].sock);
1222    
1223     if (idx > 0 && dcc[idx].type && dcc[idx].type->outdone)
1224     dcc[idx].type->outdone(idx);
1225     }
1226     }
1227     }
1228     }
1229    
1230    
1231     /*
1232     * Debugging stuff
1233     */
1234    
1235     void tell_netdebug(int idx)
1236     {
1237     int i;
1238     char s[80];
1239    
1240     dprintf(idx, "Open sockets:");
1241     for (i = 0; i < threaddata()->MAXSOCKS; i++) {
1242     if (!(socklist[i].flags & SOCK_UNUSED)) {
1243     sprintf(s, " %d", socklist[i].sock);
1244     if (socklist[i].flags & SOCK_BINARY)
1245     strcat(s, " (binary)");
1246     if (socklist[i].flags & SOCK_LISTEN)
1247     strcat(s, " (listen)");
1248     if (socklist[i].flags & SOCK_PASS)
1249     strcat(s, " (passed on)");
1250     if (socklist[i].flags & SOCK_CONNECT)
1251     strcat(s, " (connecting)");
1252     if (socklist[i].flags & SOCK_STRONGCONN)
1253     strcat(s, " (strong)");
1254     if (socklist[i].flags & SOCK_NONSOCK)
1255     strcat(s, " (file)");
1256 pseudo 1.5 #ifdef TLS
1257     if (socklist[i].ssl)
1258     strcat(s, " (TLS)");
1259     #endif
1260 simple 1.1 if (socklist[i].flags & SOCK_TCL)
1261     strcat(s, " (tcl)");
1262     if (!(socklist[i].flags & SOCK_TCL)) {
1263     if (socklist[i].handler.sock.inbuf != NULL)
1264     sprintf(&s[strlen(s)], " (inbuf: %04X)",
1265     (unsigned int) strlen(socklist[i].handler.sock.inbuf));
1266     if (socklist[i].handler.sock.outbuf != NULL)
1267     sprintf(&s[strlen(s)], " (outbuf: %06lX)", socklist[i].handler.sock.outbuflen);
1268     }
1269     strcat(s, ",");
1270     dprintf(idx, "%s", s);
1271     }
1272     }
1273     dprintf(idx, " done.\n");
1274     }
1275    
1276     /* Security-flavoured sanity checking on DCC connections of all sorts can be
1277     * done with this routine. Feed it the proper information from your DCC
1278     * before you attempt the connection, and this will make an attempt at
1279     * figuring out if the connection is really that person, or someone screwing
1280     * around. It's not foolproof, but anything that fails this check probably
1281     * isn't going to work anyway due to masquerading firewalls, NAT routers,
1282     * or bugs in mIRC.
1283     */
1284     int sanitycheck_dcc(char *nick, char *from, char *ipaddy, char *port)
1285     {
1286     /* According to the latest RFC, the clients SHOULD be able to handle
1287     * DNS names that are up to 255 characters long. This is not broken.
1288     */
1289    
1290 pseudo 1.2 #ifdef IPV6
1291     char badaddress[INET6_ADDRSTRLEN];
1292     sockname_t name;
1293     IP ip = 0;
1294     #else
1295     char badaddress[sizeof "255.255.255.255"];
1296 simple 1.1 IP ip = my_atoul(ipaddy);
1297 pseudo 1.2 #endif
1298 simple 1.1 int prt = atoi(port);
1299    
1300     /* It is disabled HERE so we only have to check in *one* spot! */
1301     if (!dcc_sanitycheck)
1302     return 1;
1303    
1304     if (prt < 1) {
1305     putlog(LOG_MISC, "*", "ALERT: (%s!%s) specified an impossible port of %u!",
1306     nick, from, prt);
1307     return 0;
1308     }
1309 pseudo 1.2 #ifdef IPV6
1310     if (strchr(ipaddy, ':')) {
1311     if (inet_pton(AF_INET6, ipaddy, &name.addr.s6.sin6_addr) != 1) {
1312     putlog(LOG_MISC, "*", "ALERT: (%s!%s) specified an invalid IPv6 "
1313     "address of %s!", nick, from, ipaddy);
1314     return 0;
1315     }
1316     if (IN6_IS_ADDR_V4MAPPED(&name.addr.s6.sin6_addr))
1317     ip = ntohl(*(IP *) &name.addr.s6.sin6_addr.s6_addr[12]);
1318     }
1319     #endif
1320     if (ip && inet_ntop(AF_INET, &ip, badaddress, sizeof badaddress) &&
1321     (ip < (1 << 24))) {
1322 simple 1.1 putlog(LOG_MISC, "*", "ALERT: (%s!%s) specified an impossible IP of %s!",
1323     nick, from, badaddress);
1324     return 0;
1325     }
1326     return 1;
1327     }
1328    
1329 pseudo 1.2 int hostsanitycheck_dcc(char *nick, char *from, sockname_t *ip, char *dnsname,
1330 simple 1.1 char *prt)
1331     {
1332 pseudo 1.2 char badaddress[INET6_ADDRSTRLEN];
1333    
1334 simple 1.1 /* According to the latest RFC, the clients SHOULD be able to handle
1335     * DNS names that are up to 255 characters long. This is not broken.
1336     */
1337 pseudo 1.2 char hostn[256];
1338 simple 1.1
1339     /* It is disabled HERE so we only have to check in *one* spot! */
1340     if (!dcc_sanitycheck)
1341     return 1;
1342 pseudo 1.2 strcpy(badaddress, iptostr(&ip->addr.sa));
1343 simple 1.1 /* These should pad like crazy with zeros, since 120 bytes or so is
1344     * where the routines providing our data currently lose interest. I'm
1345     * using the n-variant in case someone changes that...
1346     */
1347     strncpyz(hostn, extracthostname(from), sizeof hostn);
1348     if (!egg_strcasecmp(hostn, dnsname)) {
1349     putlog(LOG_DEBUG, "*", "DNS information for submitted IP checks out.");
1350     return 1;
1351     }
1352     if (!strcmp(badaddress, dnsname))
1353     putlog(LOG_MISC, "*", "ALERT: (%s!%s) sent a DCC request with bogus IP "
1354     "information of %s port %s. %s does not resolve to %s!", nick, from,
1355     badaddress, prt, from, badaddress);
1356     else
1357     return 1; /* <- usually happens when we have
1358     * a user with an unresolved hostmask! */
1359     return 0;
1360     }
1361    
1362     /* Checks wether the referenced socket has data queued.
1363     *
1364     * Returns true if the incoming/outgoing (depending on 'type') queues
1365     * contain data, otherwise false.
1366     */
1367     int sock_has_data(int type, int sock)
1368     {
1369     int ret = 0, i;
1370    
1371     for (i = 0; i < threaddata()->MAXSOCKS; i++)
1372     if (!(socklist[i].flags & SOCK_UNUSED) && socklist[i].sock == sock)
1373     break;
1374     if (i < threaddata()->MAXSOCKS) {
1375     switch (type) {
1376     case SOCK_DATA_OUTGOING:
1377     ret = (socklist[i].handler.sock.outbuf != NULL);
1378     break;
1379     case SOCK_DATA_INCOMING:
1380     ret = (socklist[i].handler.sock.inbuf != NULL);
1381     break;
1382     }
1383     } else
1384     debug1("sock_has_data: could not find socket #%d, returning false.", sock);
1385     return ret;
1386     }
1387    
1388     /* flush_inbuf():
1389     * checks if there's data in the incoming buffer of an connection
1390     * and flushs the buffer if possible
1391     *
1392     * returns: -1 if the dcc entry wasn't found
1393     * -2 if dcc[idx].type->activity doesn't exist and the data couldn't
1394     * be handled
1395     * 0 if buffer was empty
1396     * otherwise length of flushed buffer
1397     */
1398     int flush_inbuf(int idx)
1399     {
1400     int i, len;
1401     char *inbuf;
1402    
1403     Assert((idx >= 0) && (idx < dcc_total));
1404     for (i = 0; i < threaddata()->MAXSOCKS; i++) {
1405     if ((dcc[idx].sock == socklist[i].sock) &&
1406     !(socklist[i].flags & SOCK_UNUSED)) {
1407     len = socklist[i].handler.sock.inbuflen;
1408     if ((len > 0) && socklist[i].handler.sock.inbuf) {
1409     if (dcc[idx].type && dcc[idx].type->activity) {
1410     inbuf = socklist[i].handler.sock.inbuf;
1411     socklist[i].handler.sock.inbuf = NULL;
1412     dcc[idx].type->activity(idx, inbuf, len);
1413     nfree(inbuf);
1414     return len;
1415     } else
1416     return -2;
1417     } else
1418     return 0;
1419     }
1420     }
1421     return -1;
1422     }
1423 pseudo 1.5
1424     /* Find sock in socklist.
1425     *
1426     * Returns index in socklist or -1 if not found.
1427     */
1428     int findsock(int sock)
1429     {
1430     int i;
1431     struct threaddata *td = threaddata();
1432    
1433     for (i = 0; i < td->MAXSOCKS; i++)
1434     if (td->socklist[i].sock == sock)
1435     break;
1436     if (i == td->MAXSOCKS)
1437     return -1;
1438     return i;
1439     }

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