/[cvs]/eggdrop1.9/src/net.c
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Contents of /eggdrop1.9/src/net.c

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Revision 1.51 - (show annotations) (download) (as text)
Wed Jan 16 22:09:43 2002 UTC (17 years, 9 months ago) by ite
Branch: MAIN
Changes since 1.50: +2 -2 lines
File MIME type: text/x-chdr
Removed our malloc_strcpy macro sincw it had the same functionality of strdup (provided the respective fallback function)

1 /*
2 * net.c -- handles:
3 * all raw network i/o
4 *
5 * $Id: net.c,v 1.50 2001/12/18 07:04:21 guppy Exp $
6 */
7 /*
8 * This is hereby released into the public domain.
9 * Robey Pointer, robey@netcom.com
10 */
11
12 #include <fcntl.h>
13 #include "main.h"
14 #include <limits.h>
15 #include <string.h>
16 #include <netdb.h>
17 #include <sys/socket.h>
18 #if HAVE_SYS_SELECT_H
19 # include <sys/select.h>
20 #endif
21 #include <netinet/in.h>
22 #include <arpa/inet.h>
23 #include <errno.h>
24 #if HAVE_UNISTD_H
25 # include <unistd.h>
26 #endif
27 #include <setjmp.h>
28
29 #include "lib/adns/adns.h"
30 #include "egg_timer.h"
31
32 #if !HAVE_GETDTABLESIZE
33 # ifdef FD_SETSIZE
34 # define getdtablesize() FD_SETSIZE
35 # else
36 # define getdtablesize() 200
37 # endif
38 #endif
39
40 #ifndef IN6_IS_ADDR_V4MAPPED
41 # define IN6_IS_ADDR_V4MAPPED(a) \
42 ((((uint32_t *) (a))[0] == 0) && (((uint32_t *) (a))[1] == 0) && \
43 (((uint32_t *) (a))[2] == htonl (0xffff)))
44 #endif
45
46 extern struct dcc_t *dcc;
47 extern int backgrd, use_stderr, resolve_timeout, dcc_total;
48 extern unsigned long otraffic_irc_today, otraffic_bn_today,
49 otraffic_dcc_today, otraffic_filesys_today,
50 otraffic_trans_today, otraffic_unknown_today;
51 extern char natip[];
52
53 char myip[121] = ""; /* IP can be specified in the config file */
54 char myip6[121] = ""; /* IP6 can be specified in the config file */
55 char firewall[121] = ""; /* Socks server for firewall */
56 int firewallport = 1080; /* Default port of Sock4/5 firewalls */
57 char botuser[21] = "eggdrop"; /* Username of the user running the bot */
58 sock_list *socklist = NULL; /* Enough to be safe */
59 int MAXSOCKS = 0;
60 jmp_buf alarmret; /* Env buffer for alarm() returns */
61 IP localipv4addr = 0; /* Cache the local IPv4 address */
62
63 adns_state ads;
64
65 /* Types of proxy */
66 #define PROXY_SOCKS 1
67 #define PROXY_SUN 2
68
69 /* Initialize the socklist
70 */
71 void init_net()
72 {
73 int i;
74 char s[256];
75 struct hostent *hp;
76
77 socklist = (sock_list *)calloc(MAXSOCKS, sizeof(sock_list));
78 for (i = 0; i < MAXSOCKS; i++) {
79 socklist[i].flags = SOCK_UNUSED;
80 }
81
82 gethostname(s, sizeof s);
83 if ((hp = gethostbyname(s)) == NULL)
84 fatal("Hostname self-lookup failed.", 0);
85 localipv4addr = *((IP*) (hp->h_addr_list[0]));
86
87 /* init ADNS */
88 i = adns_init(&ads, adns_if_noautosys, 0);
89 if (i)
90 fatal(adns_strerror(i), 0);
91 }
92
93 /* Get my ip number
94 */
95 IP getmyip()
96 {
97 /* Could be pre-defined */
98 if (myip[0] && (myip[strlen(myip) - 1] >= '0') &&
99 (myip[strlen(myip) - 1] <= '9')) {
100 return (IP) inet_addr(myip);
101 }
102 return localipv4addr;
103 }
104
105 #ifdef IPV6
106 struct in6_addr getmyip6()
107 {
108 struct in6_addr ip;
109
110 /* Could be pre-defined */
111 if (myip6[0])
112 inet_pton(AF_INET6, myip6, &ip);
113 else {
114 /* get system's default IPv6 ip -- FIXME!? */
115 /* is there a know way?! - drummer */
116 ip = in6addr_any;
117 }
118 return ip;
119 }
120
121 struct in6_addr ipv4to6(IP a)
122 {
123 struct in6_addr ip;
124 if (a == INADDR_ANY)
125 return in6addr_any;
126 else {
127 ((uint32_t *)&ip)[0] = 0;
128 ((uint32_t *)&ip)[1] = 0;
129 ((uint16_t *)&ip)[4] = 0;
130 ((uint16_t *)&ip)[5] = 0xffff;
131 ((uint32_t *)&ip)[3] = a;
132 }
133 return ip;
134 }
135
136 #endif
137
138 void neterror(char *s)
139 {
140 switch (errno) {
141 case EADDRINUSE:
142 strcpy(s, "Address already in use");
143 break;
144 case EADDRNOTAVAIL:
145 strcpy(s, "Address invalid on remote machine");
146 break;
147 case EAFNOSUPPORT:
148 strcpy(s, "Address family not supported");
149 break;
150 case EALREADY:
151 strcpy(s, "Socket already in use");
152 break;
153 case EBADF:
154 strcpy(s, "Socket descriptor is bad");
155 break;
156 case ECONNREFUSED:
157 strcpy(s, "Connection refused");
158 break;
159 case EFAULT:
160 strcpy(s, "Namespace segment violation");
161 break;
162 case EINPROGRESS:
163 strcpy(s, "Operation in progress");
164 break;
165 case EINTR:
166 strcpy(s, "Timeout");
167 break;
168 case EINVAL:
169 strcpy(s, "Invalid namespace");
170 break;
171 case EISCONN:
172 strcpy(s, "Socket already connected");
173 break;
174 case ENETUNREACH:
175 strcpy(s, "Network unreachable");
176 break;
177 case ENOTSOCK:
178 strcpy(s, "File descriptor, not a socket");
179 break;
180 case ETIMEDOUT:
181 strcpy(s, "Connection timed out");
182 break;
183 case ENOTCONN:
184 strcpy(s, "Socket is not connected");
185 break;
186 case EHOSTUNREACH:
187 strcpy(s, "Host is unreachable");
188 break;
189 case EPIPE:
190 strcpy(s, "Broken pipe");
191 break;
192 #ifdef ECONNRESET
193 case ECONNRESET:
194 strcpy(s, "Connection reset by peer");
195 break;
196 #endif
197 #ifdef EACCES
198 case EACCES:
199 strcpy(s, "Permission denied");
200 break;
201 #endif
202 case 0:
203 strcpy(s, "Error 0");
204 break;
205 default:
206 sprintf(s, "Unforseen error %d", errno);
207 break;
208 }
209 }
210
211 /* Sets/Unsets options for a specific socket.
212 *
213 * Returns: 0 - on success
214 * -1 - socket not found
215 * -2 - illegal operation
216 */
217 int sockoptions(int sock, int operation, int sock_options)
218 {
219 int i;
220
221 for (i = 0; i < MAXSOCKS; i++)
222 if ((socklist[i].sock == sock) && !(socklist[i].flags & SOCK_UNUSED)) {
223 if (operation == EGG_OPTION_SET)
224 socklist[i].flags |= sock_options;
225 else if (operation == EGG_OPTION_UNSET)
226 socklist[i].flags &= ~sock_options;
227 else
228 return -2;
229 return 0;
230 }
231 return -1;
232 }
233
234 /* Return a free entry in the socket entry
235 */
236 int allocsock(int sock, int options)
237 {
238 int i;
239
240 for (i = 0; i < MAXSOCKS; i++) {
241 if (socklist[i].flags & SOCK_UNUSED) break;
242 }
243
244 if (i == MAXSOCKS) {
245 int j;
246
247 /* Expand table by 5 */
248 socklist = (sock_list *)realloc(socklist, (MAXSOCKS+5) * sizeof(sock_list));
249 memset(socklist+MAXSOCKS, 0, 5 * sizeof(sock_list));
250 for (j = 0; j < 5; j++) socklist[MAXSOCKS+j].flags = SOCK_UNUSED;
251 MAXSOCKS += 5;
252 }
253
254 memset(socklist+i, 0, sizeof(sock_list));
255 socklist[i].flags = options;
256 socklist[i].sock = sock;
257 return(i);
258 }
259
260 /* Request a normal socket for i/o
261 */
262 void setsock(int sock, int options)
263 {
264 int i = allocsock(sock, options);
265 int parm;
266
267 if (((sock != STDOUT) || backgrd) &&
268 !(socklist[i].flags & SOCK_NONSOCK)) {
269 parm = 1;
270 setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (void *) &parm, sizeof(int));
271
272 parm = 0;
273 setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *) &parm, sizeof(int));
274 }
275 if (options & SOCK_LISTEN) {
276 /* Tris says this lets us grab the same port again next time */
277 parm = 1;
278 setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *) &parm, sizeof(int));
279 }
280 /* Yay async i/o ! */
281 fcntl(sock, F_SETFL, O_NONBLOCK);
282 }
283
284 int getsock(int options)
285 {
286 #ifdef IPV6
287 int sock = socket(AF_INET6, SOCK_STREAM, 0);
288 #else
289 int sock = socket(AF_INET, SOCK_STREAM, 0);
290 #endif
291
292 if (sock >= 0)
293 setsock(sock, options);
294 else
295 putlog(LOG_MISC, "*", "Warning: Can't create new socket!");
296 return sock;
297 }
298
299 /* Done with a socket
300 */
301 void killsock(register int sock)
302 {
303 register int i;
304
305 /* Ignore invalid sockets. */
306 if (sock < 0)
307 return;
308 for (i = 0; i < MAXSOCKS; i++) {
309 if ((socklist[i].sock == sock) && !(socklist[i].flags & SOCK_UNUSED)) {
310 close(socklist[i].sock);
311 if (socklist[i].inbuf != NULL)
312 free_null(socklist[i].inbuf);
313 if (socklist[i].outbuf != NULL) {
314 free_null(socklist[i].outbuf);
315 socklist[i].outbuflen = 0;
316 }
317 socklist[i].flags = SOCK_UNUSED;
318 return;
319 }
320 }
321 putlog(LOG_MISC, "*", "Attempt to kill un-allocated socket %d !!", sock);
322 }
323
324 /* Send connection request to proxy
325 */
326 static int proxy_connect(int sock, char *host, int port, int proxy)
327 {
328 unsigned char x[10];
329 struct hostent *hp;
330 char s[256];
331 int i;
332
333 /* socks proxy */
334 if (proxy == PROXY_SOCKS) {
335 /* numeric IP? */
336 if (host[strlen(host) - 1] >= '0' && host[strlen(host) - 1] <= '9') {
337 IP ip = ((IP) inet_addr(host)); /* drummer */
338 memcpy(x, &ip, 4); /* Beige@Efnet */
339 } else {
340 /* no, must be host.domain */
341 if (!setjmp(alarmret)) {
342 alarm(resolve_timeout);
343 hp = gethostbyname(host);
344 alarm(0);
345 } else {
346 hp = NULL;
347 }
348 if (hp == NULL) {
349 killsock(sock);
350 return -2;
351 }
352 memcpy(x, hp->h_addr, hp->h_length);
353 }
354 for (i = 0; i < MAXSOCKS; i++)
355 if (!(socklist[i].flags & SOCK_UNUSED) && socklist[i].sock == sock)
356 socklist[i].flags |= SOCK_PROXYWAIT; /* drummer */
357 snprintf(s, sizeof s, "\004\001%c%c%c%c%c%c%s", (port >> 8) % 256,
358 (port % 256), x[0], x[1], x[2], x[3], botuser);
359 tputs(sock, s, strlen(botuser) + 9); /* drummer */
360 } else if (proxy == PROXY_SUN) {
361 snprintf(s, sizeof s, "%s %d\n", host, port);
362 tputs(sock, s, strlen(s)); /* drummer */
363 }
364 return sock;
365 }
366
367 /* Starts a connection attempt to a socket
368 *
369 * If given a normal hostname, this will be resolved to the corresponding
370 * IP address first. PLEASE try to use the non-blocking dns functions
371 * instead and then call this function with the IP address to avoid blocking.
372 *
373 * returns <0 if connection refused:
374 * -1 neterror() type error
375 * -2 can't resolve hostname
376 */
377 int open_telnet_raw(int sock, char *server, int sport)
378 {
379 #ifdef IPV6
380 struct sockaddr_in6 name, vname;
381 #else
382 struct sockaddr_in name, vname;
383 #endif
384 struct hostent *hp;
385 char host[121];
386 int i, port;
387 volatile int proxy;
388
389 debug2("|NET| open_telnet_raw: %s %d", server, sport);
390
391 /* firewall? use socks */
392 if (firewall[0]) {
393 if (firewall[0] == '!') {
394 proxy = PROXY_SUN;
395 strcpy(host, &firewall[1]);
396 } else {
397 proxy = PROXY_SOCKS;
398 strcpy(host, firewall);
399 }
400 port = firewallport;
401 } else {
402 proxy = 0;
403 strcpy(host, server);
404 port = sport;
405 }
406
407 memset((char *) &name, 0, sizeof name);
408 #ifdef IPV6
409 name.sin6_family = AF_INET6;
410 name.sin6_port = htons(port);
411 #else
412 name.sin_family = AF_INET;
413 name.sin_port = htons(port);
414 #endif
415
416 if (!setjmp(alarmret)) {
417 char *p;
418 int type;
419
420 alarm(resolve_timeout);
421
422 if (!strncasecmp("ipv6%", host, 5)) {
423 type = AF_INET6;
424 p = host + 5;
425 debug1("|NET| checking only AAAA record for %s", p);
426 } else if (!strncasecmp("ipv4%", host, 5)) {
427 type = AF_INET;
428 p = host + 5;
429 debug1("|NET| checking only A record for %s", p);
430 } else {
431 type = AF_INET; /* af_preferred */
432 p = host;
433 }
434 alarm(resolve_timeout);
435 #ifndef IPV6
436 hp = gethostbyname(p);
437 #else
438 hp = gethostbyname2(p, type);
439 if (!hp && (p == host))
440 hp = gethostbyname2(p, (type == AF_INET6 ? AF_INET : AF_INET6));
441 #endif
442 alarm(0);
443 } else {
444 hp = NULL;
445 }
446 if (hp == NULL)
447 return -2;
448
449 #ifndef IPV6
450 memcpy(&name.sin_addr, hp->h_addr, hp->h_length);
451 name.sin_family = hp->h_addrtype;
452 #else
453 if (hp->h_addrtype == AF_INET6)
454 memcpy(&name.sin6_addr, hp->h_addr, hp->h_length);
455 else if (hp->h_addrtype == AF_INET)
456 name.sin6_addr = ipv4to6(*((unsigned int*) hp->h_addr));
457 else
458 return -123; /* panic :P */
459 name.sin6_family = AF_INET6;
460 #endif
461
462 memset((char *) &vname, 0, sizeof vname);
463 #ifndef IPV6
464 vname.sin_family = AF_INET;
465 vname.sin_addr.s_addr = (myip[0] ? getmyip() : INADDR_ANY);
466 #else
467 vname.sin6_family = AF_INET6;
468 if (IN6_IS_ADDR_V4MAPPED(&name.sin6_addr))
469 vname.sin6_addr = ipv4to6(myip[0] ? getmyip() : INADDR_ANY);
470 else
471 vname.sin6_addr = (myip6[0] ? getmyip6() : in6addr_any);
472 #endif
473 if (bind(sock, (struct sockaddr *) &vname, sizeof vname) < 0)
474 return -1;
475
476 for (i = 0; i < MAXSOCKS; i++) {
477 if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].sock == sock))
478 socklist[i].flags = (socklist[i].flags & ~SOCK_VIRTUAL) | SOCK_CONNECT;
479 }
480 if (connect(sock, (struct sockaddr *) &name, (sizeof name)) < 0) {
481 if (errno == EINPROGRESS) {
482 /* Firewall? announce connect attempt to proxy */
483 if (firewall[0])
484 return proxy_connect(sock, server, sport, proxy);
485 return sock; /* async success! */
486 } else
487 return -1;
488 }
489 /* Synchronous? :/ */
490 if (firewall[0])
491 return proxy_connect(sock, server, sport, proxy);
492 return sock;
493 }
494
495 /* Ordinary non-binary connection attempt */
496 int open_telnet(char *server, int port)
497 {
498 int sock = getsock(0),
499 ret = open_telnet_raw(sock, server, port);
500
501 if (ret < 0)
502 killsock(sock);
503 return ret;
504 }
505
506 /* Returns a socket number for a listening socket that will accept any
507 * connection on a certain address -- port # is returned in port
508 * "" means on any address
509 */
510 int open_address_listen(char *addr, int *port)
511 {
512 int sock;
513 unsigned int addrlen;
514 #ifdef IPV6
515 struct sockaddr_in6 name;
516 #else
517 struct sockaddr_in name;
518 #endif
519
520 if (firewall[0]) {
521 /* FIXME: can't do listen port thru firewall yet */
522 putlog(LOG_MISC, "*", "!! Cant open a listen port (you are using a firewall)");
523 return -1;
524 }
525
526 sock = getsock(SOCK_LISTEN);
527 if (sock < 1)
528 return -1;
529
530 debug2("|NET| open_address_listen(\"%s\", %d)", addr, *port);
531
532 memset((char *) &name, 0, sizeof name);
533 #ifdef IPV6
534 name.sin6_family = AF_INET6;
535 name.sin6_port = htons(*port); /* 0 = just assign us a port */
536 if (!addr[0])
537 name.sin6_addr = in6addr_any;
538 else if (!inet_pton(AF_INET6, addr, &name.sin6_addr)) {
539 struct in_addr a4;
540 if (inet_aton(addr, &a4))
541 name.sin6_addr = ipv4to6(a4.s_addr);
542 else
543 name.sin6_addr = in6addr_any;
544 }
545 #else
546 name.sin_family = AF_INET;
547 name.sin_port = htons(*port); /* 0 = just assign us a port */
548 if (addr[0])
549 inet_aton(addr, &name.sin_addr);
550 else
551 name.sin_addr.s_addr = INADDR_ANY;
552 #endif
553 if (bind(sock, (struct sockaddr *) &name, sizeof name) < 0) {
554 killsock(sock);
555 if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT)
556 return -2;
557 else
558 return -1;
559 }
560 /* what port are we on? */
561 addrlen = sizeof name;
562 if (getsockname(sock, (struct sockaddr *) &name, &addrlen) < 0) {
563 killsock(sock);
564 return -1;
565 }
566 #ifdef IPV6
567 *port = ntohs(name.sin6_port);
568 #else
569 *port = ntohs(name.sin_port);
570 #endif
571 if (listen(sock, 1) < 0) {
572 killsock(sock);
573 return -1;
574 }
575 return sock;
576 }
577
578 /* Returns a socket number for a listening socket that will accept any
579 * connection -- port # is returned in port
580 */
581 inline int open_listen(int *port, int af)
582 {
583 if (af == AF_INET)
584 return open_address_listen(myip, port);
585 #ifdef IPV6
586 else if (af == AF_INET6)
587 return open_address_listen(myip6, port);
588 #endif
589 else
590 return -1;
591 }
592
593 /* Returns the given network byte order IP address in the
594 * dotted format - "##.##.##.##"
595 * (it's IPv4 only, and it's okey - drummer)
596 */
597 char *iptostr(IP ip)
598 {
599 struct in_addr a;
600
601 a.s_addr = ip;
602 return inet_ntoa(a);
603 }
604
605 char *getlocaladdr(int sock)
606 {
607 static char buf[ADDRLEN];
608 #ifdef IPV6
609 struct sockaddr_in6 sa;
610 #else
611 struct sockaddr_in sa;
612 #endif
613 int len = sizeof sa;
614
615 if (sock == -1) { /* assuming IPv4... */
616 sprintf(buf, "%lu", (unsigned long int)
617 ntohl(natip[0] ? inet_addr(natip) : getmyip()));
618 return buf;
619 }
620
621 if (getsockname(sock, (struct sockaddr*) &sa, &len) == -1) {
622 debug1("|NET| getsockname() failed for sock %d", sock);
623 return 0;
624 }
625 #ifdef IPV6
626 if (IN6_IS_ADDR_V4MAPPED(&sa.sin6_addr))
627 sprintf(buf, "%lu",
628 (unsigned long int) ntohl(((uint32_t *)&sa.sin6_addr)[3]));
629 else
630 inet_ntop(AF_INET6, &(sa.sin6_addr), buf, sizeof buf);
631 #else
632 sprintf(buf, "%lu", (unsigned long int) ntohl(sa.sin_addr.s_addr));
633 #endif
634 return buf;
635 }
636
637 /* Short routine to answer a connect received on a socket made previously
638 * by open_listen ... returns hostname of the caller & the new socket
639 * does NOT dispose of old "public" socket!
640 */
641 int answer(int sock, char *caller, char *ip, unsigned short *port,
642 int binary)
643 {
644 int new_sock;
645 unsigned int addrlen;
646 #ifdef IPV6
647 struct sockaddr_in6 from;
648 #else
649 struct sockaddr_in from;
650 #endif
651
652 addrlen = sizeof from;
653 new_sock = accept(sock, (struct sockaddr *) &from, &addrlen);
654 if (new_sock < 0)
655 return -1;
656 if (ip != NULL) {
657 #ifdef IPV6
658 if (IN6_IS_ADDR_V4MAPPED(&from.sin6_addr))
659 inet_ntop(AF_INET, &(((uint32_t *)&from.sin6_addr)[3]), ip, ADDRMAX);
660 else
661 inet_ntop(AF_INET6, &(from.sin6_addr), ip, ADDRMAX);
662 #else
663 inet_ntop(AF_INET, &(from.sin_addr.s_addr), ip, ADDRMAX);
664 #endif
665 /* This is now done asynchronously. We now only provide the IP address.
666 */
667 strncpyz(caller, ip, 121);
668 }
669 if (port != NULL)
670 #ifdef IPV6
671 *port = ntohs(from.sin6_port);
672 #else
673 *port = ntohs(from.sin_port);
674 #endif
675 /* Set up all the normal socket crap */
676 setsock(new_sock, (binary ? SOCK_BINARY : 0));
677 return new_sock;
678 }
679
680 /* Like open_telnet, but uses server & port specifications of dcc
681 */
682 int open_telnet_dcc(int sock, char *server, char *port)
683 {
684 int p;
685 struct in_addr ia;
686
687 debug2("|NET| open_telnet_dcc: %s %s", server, port);
688 if (port != NULL)
689 p = atoi(port);
690 else
691 return -3;
692 if (server == NULL)
693 return -3;
694 /* fix the IPv4 IP format (ie: 167772161 -> 10.0.0.1) */
695 if (inet_aton(server, &ia))
696 return open_telnet_raw(sock, inet_ntoa(ia), p);
697 else
698 return open_telnet_raw(sock, server, p);
699 }
700
701 void egg_dns_gotanswer(int status, adns_answer *aw, char *origname)
702 {
703 char name[UHOSTLEN];
704 #ifdef IPV6
705 char *orign2;
706 #endif
707
708 if (!aw) {
709 debug0("|DNS| egg_dns_gotanswer: ANSWER IS NULL!");
710 return;
711 }
712 if (!origname) {
713 debug0("|DNS| egg_dns_gotanswer: origname is NULL!");
714 return;
715 }
716
717 debug2("|DNS| egg_dns_gotanswer: status=%d adns_answer=%x", status, (int)aw);
718 status = 0;
719 if ((aw->type == adns_r_addr)
720 #ifdef IPV6
721 || (aw->type == adns_r_addr6)
722 #endif
723 ) {
724 if ((aw->status == adns_s_ok) && (aw->nrrs > 0)) {
725 adns_rr_addr *rrp = aw->rrs.untyped;
726 if (rrp->addr.sa.sa_family == AF_INET) {
727 inet_ntop(AF_INET, &(rrp->addr.inet.sin_addr), name, UHOSTLEN-1);
728 status = 1;
729 #ifdef IPV6
730 } else if (rrp->addr.sa.sa_family == AF_INET6) {
731 inet_ntop(AF_INET6, &(rrp->addr.inet6.sin6_addr), name, UHOSTLEN-1);
732 status = 1;
733 #endif
734 }
735 #ifdef IPV6
736 } else if ((aw->type == adns_r_addr /* af_preferred */) &&
737 strncasecmp(origname, "ipv6%", 5) &&
738 strncasecmp(origname, "ipv4%", 5)) {
739 adns_query q6;
740 orign2 = strdup(origname);
741 /* ...it may be AAAA */
742 debug1("|DNS| egg_dns_gotanswer: A failed, checking for AAAA (%s)", origname);
743 adns_submit(ads, origname, adns_r_addr6, 0, orign2, &q6);
744 status = -1;
745 #endif
746 }
747 if (status == 0)
748 strcpy(name, "0.0.0.0");
749 if (status >= 0) {
750 debug3("|DNS| egg_dns_gotanswer: (ipbyhost) host: %s ip: %s status: %d", origname, name, status);
751 call_ipbyhost(origname, name, status);
752 }
753 } else if ((aw->type == adns_r_ptr_ip6) || (aw->type == adns_r_ptr)) {
754 if ((aw->status == adns_s_ok) && (aw->nrrs > 0)) {
755 if (aw->rrs.str) {
756 strncpyz(name, *(aw->rrs.str), UHOSTLEN);
757 status = 1;
758 }
759 }
760 if (!status) {
761 if (origname)
762 strncpyz(name, origname, UHOSTLEN);
763 else
764 strcpy(name, "error");
765 }
766 debug3("|DNS| egg_dns_gotanswer: (hostbyip) ip: %s host: %s status: %d", origname, name, status);
767 call_hostbyip(origname, name, status);
768 } else
769 debug0("|DNS| egg_dns_gotanswer: got unknow type of answer ?!");
770 free(origname);
771 }
772
773 void egg_dns_checkall()
774 {
775 adns_query q, r;
776 adns_answer *answer;
777 char *origname;
778
779 adns_forallqueries_begin(ads);
780 while ((q = adns_forallqueries_next(ads, (void **)&r)) != NULL) {
781 switch (adns_check(ads, &q, &answer, (void **)&origname)) {
782 case 0: /* ok */
783 egg_dns_gotanswer(1, answer, origname);
784 break;
785 case EAGAIN: /* Go into the queue again */
786 break;
787 default: /* failed */
788 egg_dns_gotanswer(0, answer, origname);
789 break;
790 }
791 }
792 }
793
794 /* Attempts to read from all the sockets in socklist
795 * fills s with up to 511 bytes if available, and returns the array index
796 *
797 * on EOF: returns -1, with socket in len
798 * on socket error: returns -2
799 * if nothing is ready: returns -3
800 */
801 static int sockread(char *s, int *len)
802 {
803 fd_set fd, fdw, fde;
804 int fds, i, x;
805 struct timeval t, tnow;
806 struct timeval *pt = &t;
807 int grab = 511;
808 egg_timeval_t howlong;
809
810 fds = getdtablesize();
811 #ifdef FD_SETSIZE
812 if (fds > FD_SETSIZE)
813 fds = FD_SETSIZE; /* Fixes YET ANOTHER freebsd bug!!! */
814 #endif
815
816 if (timer_get_shortest(&howlong)) {
817 /* No timer, default to 1 second. */
818 t.tv_sec = 1;
819 t.tv_usec = 0;
820 }
821 else {
822 t.tv_sec = howlong.sec;
823 t.tv_usec = howlong.usec;
824 }
825
826 FD_ZERO(&fd);
827
828 for (i = 0; i < MAXSOCKS; i++)
829 if (!(socklist[i].flags & (SOCK_UNUSED | SOCK_VIRTUAL))) {
830 if ((socklist[i].sock == STDOUT) && !backgrd)
831 FD_SET(STDIN, &fd);
832 else
833 FD_SET(socklist[i].sock, &fd);
834 }
835 tnow.tv_sec = time(NULL);
836 tnow.tv_usec = 0;
837 adns_beforeselect(ads, &fds, &fd, &fdw, &fde, &pt, 0, &tnow);
838 #ifdef HPUX_HACKS
839 #ifndef HPUX10_HACKS
840 x = select(fds, (int *) &fd, (int *) NULL, (int *) NULL, &t);
841 #else
842 x = select(fds, &fd, NULL, NULL, &t);
843 #endif
844 #else
845 x = select(fds, &fd, NULL, NULL, &t);
846 #endif
847 tnow.tv_sec = time(NULL);
848 tnow.tv_usec = 0;
849 adns_afterselect(ads, fds, &fd, &fdw, &fde, &tnow);
850
851 /* dns stuff */
852 egg_dns_checkall();
853
854 if (x > 0) {
855 /* Something happened */
856 for (i = 0; i < MAXSOCKS; i++) {
857 if ((!(socklist[i].flags & SOCK_UNUSED)) &&
858 ((FD_ISSET(socklist[i].sock, &fd)) ||
859 ((socklist[i].sock == STDOUT) && (!backgrd) &&
860 (FD_ISSET(STDIN, &fd))))) {
861 if (socklist[i].flags & (SOCK_LISTEN | SOCK_CONNECT)) {
862 /* Listening socket -- don't read, just return activity */
863 /* Same for connection attempt */
864 /* (for strong connections, require a read to succeed first) */
865 if (socklist[i].flags & SOCK_PROXYWAIT) { /* drummer */
866 /* Hang around to get the return code from proxy */
867 grab = 10;
868 } else if (!(socklist[i].flags & SOCK_STRONGCONN)) {
869 debug1("net: connect! sock %d", socklist[i].sock);
870 s[0] = 0;
871 *len = 0;
872 return i;
873 }
874 } else if (socklist[i].flags & SOCK_PASS) {
875 s[0] = 0;
876 *len = 0;
877 return i;
878 }
879 if ((socklist[i].sock == STDOUT) && !backgrd)
880 x = read(STDIN, s, grab);
881 else
882 x = read(socklist[i].sock, s, grab);
883 if (x <= 0) { /* eof */
884 if (errno == EAGAIN) {
885 s[0] = 0;
886 *len = 0;
887 return -3;
888 }
889 *len = socklist[i].sock;
890 socklist[i].flags &= ~SOCK_CONNECT;
891 debug1("net: eof!(read) socket %d", socklist[i].sock);
892 return -1;
893 }
894 s[x] = 0;
895 *len = x;
896 if (socklist[i].flags & SOCK_PROXYWAIT) {
897 debug2("net: socket: %d proxy errno: %d", socklist[i].sock, s[1]);
898 socklist[i].flags &= ~(SOCK_CONNECT | SOCK_PROXYWAIT);
899 switch (s[1]) {
900 case 90: /* Success */
901 s[0] = 0;
902 *len = 0;
903 return i;
904 case 91: /* Failed */
905 errno = ECONNREFUSED;
906 break;
907 case 92: /* No identd */
908 case 93: /* Identd said wrong username */
909 /* A better error message would be "socks misconfigured"
910 * or "identd not working" but this is simplest.
911 */
912 errno = ENETUNREACH;
913 break;
914 }
915 *len = socklist[i].sock;
916 return -1;
917 }
918 return i;
919 }
920 }
921 } else if (x == -1)
922 return -2; /* socket error */
923 else {
924 s[0] = 0;
925 *len = 0;
926 }
927 return -3;
928 }
929
930 /* sockgets: buffer and read from sockets
931 *
932 * Attempts to read from all registered sockets for up to one second. if
933 * after one second, no complete data has been received from any of the
934 * sockets, 's' will be empty, 'len' will be 0, and sockgets will return -3.
935 * if there is returnable data received from a socket, the data will be
936 * in 's' (null-terminated if non-binary), the length will be returned
937 * in len, and the socket number will be returned.
938 * normal sockets have their input buffered, and each call to sockgets
939 * will return one line terminated with a '\n'. binary sockets are not
940 * buffered and return whatever coems in as soon as it arrives.
941 * listening sockets will return an empty string when a connection comes in.
942 * connecting sockets will return an empty string on a successful connect,
943 * or EOF on a failed connect.
944 * if an EOF is detected from any of the sockets, that socket number will be
945 * put in len, and -1 will be returned.
946 * the maximum length of the string returned is 512 (including null)
947 *
948 * Returns -4 if we handled something that shouldn't be handled by the
949 * dcc functions. Simply ignore it.
950 */
951
952 int sockgets(char *s, int *len)
953 {
954 char xx[514], *p, *px;
955 int ret, i, data = 0;
956
957 for (i = 0; i < MAXSOCKS; i++) {
958 /* Check for stored-up data waiting to be processed */
959 if (!(socklist[i].flags & SOCK_UNUSED) &&
960 !(socklist[i].flags & SOCK_BUFFER) && (socklist[i].inbuf != NULL)) {
961 if (!(socklist[i].flags & SOCK_BINARY)) {
962 /* look for \r too cos windows can't follow RFCs */
963 p = strchr(socklist[i].inbuf, '\n');
964 if (p == NULL)
965 p = strchr(socklist[i].inbuf, '\r');
966 if (p != NULL) {
967 *p = 0;
968 if (strlen(socklist[i].inbuf) > 510)
969 socklist[i].inbuf[510] = 0;
970 strcpy(s, socklist[i].inbuf);
971 /* Uhm... very strange way to code this... */
972 px = (char *) malloc(strlen(p + 1) + 1);
973 strcpy(px, p + 1);
974 free(socklist[i].inbuf);
975 if (px[0])
976 socklist[i].inbuf = px;
977 else {
978 free(px);
979 socklist[i].inbuf = NULL;
980 }
981 /* Strip CR if this was CR/LF combo */
982 if (s[strlen(s) - 1] == '\r')
983 s[strlen(s) - 1] = 0;
984 *len = strlen(s);
985 return socklist[i].sock;
986 }
987 } else {
988 /* Handling buffered binary data (must have been SOCK_BUFFER before). */
989 if (socklist[i].inbuflen <= 510) {
990 *len = socklist[i].inbuflen;
991 memcpy(s, socklist[i].inbuf, socklist[i].inbuflen);
992 free_null(socklist[i].inbuf);
993 socklist[i].inbuflen = 0;
994 } else {
995 /* Split up into chunks of 510 bytes. */
996 *len = 510;
997 memcpy(s, socklist[i].inbuf, *len);
998 memcpy(socklist[i].inbuf, socklist[i].inbuf + *len, *len);
999 socklist[i].inbuflen -= *len;
1000 socklist[i].inbuf = realloc(socklist[i].inbuf,
1001 socklist[i].inbuflen);
1002 }
1003 return socklist[i].sock;
1004 }
1005 }
1006 /* Also check any sockets that might have EOF'd during write */
1007 if (!(socklist[i].flags & SOCK_UNUSED)
1008 && (socklist[i].flags & SOCK_EOFD)) {
1009 s[0] = 0;
1010 *len = socklist[i].sock;
1011 return -1;
1012 }
1013 }
1014 /* No pent-up data of any worth -- down to business */
1015 *len = 0;
1016 ret = sockread(xx, len);
1017 if (ret < 0) {
1018 s[0] = 0;
1019 return ret;
1020 }
1021 /* Binary, listening and passed on sockets don't get buffered. */
1022 if (socklist[ret].flags & SOCK_CONNECT) {
1023 if (socklist[ret].flags & SOCK_STRONGCONN) {
1024 socklist[ret].flags &= ~SOCK_STRONGCONN;
1025 /* Buffer any data that came in, for future read. */
1026 socklist[ret].inbuflen = *len;
1027 socklist[ret].inbuf = (char *) malloc(*len + 1);
1028 /* It might be binary data. You never know. */
1029 memcpy(socklist[ret].inbuf, xx, *len);
1030 socklist[ret].inbuf[*len] = 0;
1031 }
1032 socklist[ret].flags &= ~SOCK_CONNECT;
1033 s[0] = 0;
1034 return socklist[ret].sock;
1035 }
1036 if (socklist[ret].flags & SOCK_BINARY) {
1037 memcpy(s, xx, *len);
1038 return socklist[ret].sock;
1039 }
1040 if ((socklist[ret].flags & SOCK_LISTEN) ||
1041 (socklist[ret].flags & SOCK_PASS))
1042 return socklist[ret].sock;
1043 if (socklist[ret].flags & SOCK_BUFFER) {
1044 socklist[ret].inbuf = (char *) realloc(socklist[ret].inbuf,
1045 socklist[ret].inbuflen + *len + 1);
1046 memcpy(socklist[ret].inbuf + socklist[ret].inbuflen, xx, *len);
1047 socklist[ret].inbuflen += *len;
1048 /* We don't know whether it's binary data. Make sure normal strings
1049 will be handled properly later on too. */
1050 socklist[ret].inbuf[socklist[ret].inbuflen] = 0;
1051 return -4; /* Ignore this one. */
1052 }
1053 /* Might be necessary to prepend stored-up data! */
1054 if (socklist[ret].inbuf != NULL) {
1055 p = socklist[ret].inbuf;
1056 socklist[ret].inbuf = (char *) malloc(strlen(p) + strlen(xx) + 1);
1057 strcpy(socklist[ret].inbuf, p);
1058 strcat(socklist[ret].inbuf, xx);
1059 free(p);
1060 if (strlen(socklist[ret].inbuf) < 512) {
1061 strcpy(xx, socklist[ret].inbuf);
1062 free_null(socklist[ret].inbuf);
1063 socklist[ret].inbuflen = 0;
1064 } else {
1065 p = socklist[ret].inbuf;
1066 socklist[ret].inbuflen = strlen(p) - 510;
1067 socklist[ret].inbuf = (char *) malloc(socklist[ret].inbuflen + 1);
1068 strcpy(socklist[ret].inbuf, p + 510);
1069 *(p + 510) = 0;
1070 strcpy(xx, p);
1071 free(p);
1072 /* (leave the rest to be post-pended later) */
1073 }
1074 }
1075 /* Look for EOL marker; if it's there, i have something to show */
1076 p = strchr(xx, '\n');
1077 if (p == NULL)
1078 p = strchr(xx, '\r');
1079 if (p != NULL) {
1080 *p = 0;
1081 strcpy(s, xx);
1082 strcpy(xx, p + 1);
1083 if (s[strlen(s) - 1] == '\r')
1084 s[strlen(s) - 1] = 0;
1085 data = 1; /* DCC_CHAT may now need to process a
1086 blank line */
1087 /* NO! */
1088 /* if (!s[0]) strcpy(s," "); */
1089 } else {
1090 s[0] = 0;
1091 if (strlen(xx) >= 510) {
1092 /* String is too long, so just insert fake \n */
1093 strcpy(s, xx);
1094 xx[0] = 0;
1095 data = 1;
1096 }
1097 }
1098 *len = strlen(s);
1099 /* Anything left that needs to be saved? */
1100 if (!xx[0]) {
1101 if (data)
1102 return socklist[ret].sock;
1103 else
1104 return -3;
1105 }
1106 /* Prepend old data back */
1107 if (socklist[ret].inbuf != NULL) {
1108 p = socklist[ret].inbuf;
1109 socklist[ret].inbuflen = strlen(p) + strlen(xx);
1110 socklist[ret].inbuf = (char *) malloc(socklist[ret].inbuflen + 1);
1111 strcpy(socklist[ret].inbuf, xx);
1112 strcat(socklist[ret].inbuf, p);
1113 free(p);
1114 } else {
1115 socklist[ret].inbuflen = strlen(xx);
1116 socklist[ret].inbuf = (char *) malloc(socklist[ret].inbuflen + 1);
1117 strcpy(socklist[ret].inbuf, xx);
1118 }
1119 if (data) {
1120 return socklist[ret].sock;
1121 } else {
1122 return -3;
1123 }
1124 }
1125
1126 /* Dump something to a socket
1127 */
1128 void tputs(register int z, char *s, unsigned int len)
1129 {
1130 register int i, x, idx;
1131 char *p;
1132 static int inhere = 0;
1133
1134 if (z < 0)
1135 return; /* um... HELLO?! sanity check please! */
1136 if (((z == STDOUT) || (z == STDERR)) && (!backgrd || use_stderr)) {
1137 write(z, s, len);
1138 return;
1139 }
1140 for (i = 0; i < MAXSOCKS; i++) {
1141 if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].sock == z)) {
1142 for (idx = 0; idx < dcc_total; idx++) {
1143 if (dcc[idx].sock == z) {
1144 if (dcc[idx].type) {
1145 if (dcc[idx].type->name) {
1146 if (!strncmp(dcc[idx].type->name, "BOT", 3)) {
1147 otraffic_bn_today += len;
1148 break;
1149 } else if (!strcmp(dcc[idx].type->name, "SERVER")) {
1150 otraffic_irc_today += len;
1151 break;
1152 } else if (!strncmp(dcc[idx].type->name, "CHAT", 4)) {
1153 otraffic_dcc_today += len;
1154 break;
1155 } else if (!strncmp(dcc[idx].type->name, "FILES", 5)) {
1156 otraffic_filesys_today += len;
1157 break;
1158 } else if (!strcmp(dcc[idx].type->name, "SEND")) {
1159 otraffic_trans_today += len;
1160 break;
1161 } else if (!strncmp(dcc[idx].type->name, "GET", 3)) {
1162 otraffic_trans_today += len;
1163 break;
1164 } else {
1165 otraffic_unknown_today += len;
1166 break;
1167 }
1168 }
1169 }
1170 }
1171 }
1172
1173 if (socklist[i].outbuf != NULL) {
1174 /* Already queueing: just add it */
1175 p = (char *) realloc(socklist[i].outbuf, socklist[i].outbuflen + len);
1176 memcpy(p + socklist[i].outbuflen, s, len);
1177 socklist[i].outbuf = p;
1178 socklist[i].outbuflen += len;
1179 return;
1180 }
1181 /* Try. */
1182 x = write(z, s, len);
1183 if (x == (-1))
1184 x = 0;
1185 if (x < len) {
1186 /* Socket is full, queue it */
1187 socklist[i].outbuf = (char *) malloc(len - x);
1188 memcpy(socklist[i].outbuf, &s[x], len - x);
1189 socklist[i].outbuflen = len - x;
1190 }
1191 return;
1192 }
1193 }
1194 /* Make sure we don't cause a crash by looping here */
1195 if (!inhere) {
1196 inhere = 1;
1197
1198 putlog(LOG_MISC, "*", "!!! writing to nonexistent socket: %d", z);
1199 s[strlen(s) - 1] = 0;
1200 putlog(LOG_MISC, "*", "!-> '%s'", s);
1201
1202 inhere = 0;
1203 }
1204 }
1205
1206 /* tputs might queue data for sockets, let's dump as much of it as
1207 * possible.
1208 */
1209 void dequeue_sockets()
1210 {
1211 int i, x;
1212
1213 for (i = 0; i < MAXSOCKS; i++) {
1214 if (!(socklist[i].flags & SOCK_UNUSED) &&
1215 socklist[i].outbuf != NULL) {
1216 /* Trick tputs into doing the work */
1217 x = write(socklist[i].sock, socklist[i].outbuf,
1218 socklist[i].outbuflen);
1219 if ((x < 0) && (errno != EAGAIN)
1220 #ifdef EBADSLT
1221 && (errno != EBADSLT)
1222 #endif
1223 #ifdef ENOTCONN
1224 && (errno != ENOTCONN)
1225 #endif
1226 ) {
1227 /* This detects an EOF during writing */
1228 debug3("net: eof!(write) socket %d (%s,%d)", socklist[i].sock,
1229 strerror(errno), errno);
1230 socklist[i].flags |= SOCK_EOFD;
1231 } else if (x == socklist[i].outbuflen) {
1232 /* If the whole buffer was sent, nuke it */
1233 free_null(socklist[i].outbuf);
1234 socklist[i].outbuflen = 0;
1235 } else if (x > 0) {
1236 char *p = socklist[i].outbuf;
1237
1238 /* This removes any sent bytes from the beginning of the buffer */
1239 socklist[i].outbuf = (char *) malloc(socklist[i].outbuflen - x);
1240 memcpy(socklist[i].outbuf, p + x, socklist[i].outbuflen - x);
1241 socklist[i].outbuflen -= x;
1242 free(p);
1243 }
1244
1245 /* All queued data was sent. Call handler if one exists and the
1246 * dcc entry wants it.
1247 */
1248 if (!socklist[i].outbuf) {
1249 int idx = findanyidx(socklist[i].sock);
1250
1251 if (idx > 0 && dcc[idx].type && dcc[idx].type->outdone)
1252 dcc[idx].type->outdone(idx);
1253 }
1254 }
1255 }
1256 }
1257
1258
1259 /*
1260 * Debugging stuff
1261 */
1262
1263 void tell_netdebug(int idx)
1264 {
1265 int i;
1266 char s[80];
1267
1268 dprintf(idx, "Open sockets:");
1269 for (i = 0; i < MAXSOCKS; i++) {
1270 if (!(socklist[i].flags & SOCK_UNUSED)) {
1271 sprintf(s, " %d", socklist[i].sock);
1272 if (socklist[i].flags & SOCK_BINARY)
1273 strcat(s, " (binary)");
1274 if (socklist[i].flags & SOCK_LISTEN)
1275 strcat(s, " (listen)");
1276 if (socklist[i].flags & SOCK_PASS)
1277 strcat(s, " (passed on)");
1278 if (socklist[i].flags & SOCK_CONNECT)
1279 strcat(s, " (connecting)");
1280 if (socklist[i].flags & SOCK_STRONGCONN)
1281 strcat(s, " (strong)");
1282 if (socklist[i].flags & SOCK_NONSOCK)
1283 strcat(s, " (file)");
1284 if (socklist[i].inbuf != NULL)
1285 sprintf(&s[strlen(s)], " (inbuf: %04X)", strlen(socklist[i].inbuf));
1286 if (socklist[i].outbuf != NULL)
1287 sprintf(&s[strlen(s)], " (outbuf: %06lX)", socklist[i].outbuflen);
1288 strcat(s, ",");
1289 dprintf(idx, "%s", s);
1290 }
1291 }
1292 dprintf(idx, " done.\n");
1293 }
1294
1295 /* Checks wether the referenced socket has data queued.
1296 *
1297 * Returns true if the incoming/outgoing (depending on 'type') queues
1298 * contain data, otherwise false.
1299 */
1300 int sock_has_data(int type, int sock)
1301 {
1302 int ret = 0, i;
1303
1304 for (i = 0; i < MAXSOCKS; i++)
1305 if (!(socklist[i].flags & SOCK_UNUSED) && socklist[i].sock == sock)
1306 break;
1307 if (i < MAXSOCKS) {
1308 switch (type) {
1309 case SOCK_DATA_OUTGOING:
1310 ret = (socklist[i].outbuf != NULL);
1311 break;
1312 case SOCK_DATA_INCOMING:
1313 ret = (socklist[i].inbuf != NULL);
1314 break;
1315 }
1316 } else
1317 debug1("sock_has_data: could not find socket #%d, returning false.", sock);
1318 return ret;
1319 }
1320
1321 /* flush_inbuf():
1322 * checks if there's data in the incoming buffer of an connection
1323 * and flushs the buffer if possible
1324 *
1325 * returns: -1 if the dcc entry wasn't found
1326 * -2 if dcc[idx].type->activity doesn't exist and the data couldn't
1327 * be handled
1328 * 0 if buffer was empty
1329 * otherwise length of flushed buffer
1330 */
1331 int flush_inbuf(int idx)
1332 {
1333 int i, len;
1334 char *inbuf;
1335
1336 assert((idx >= 0) && (idx < dcc_total));
1337 for (i = 0; i < MAXSOCKS; i++) {
1338 if ((dcc[idx].sock == socklist[i].sock)
1339 && !(socklist[i].flags & SOCK_UNUSED)) {
1340 len = socklist[i].inbuflen;
1341 if ((len > 0) && socklist[i].inbuf) {
1342 if (dcc[idx].type && dcc[idx].type->activity) {
1343 inbuf = socklist[i].inbuf;
1344 socklist[i].inbuf = NULL;
1345 dcc[idx].type->activity(idx, inbuf, len);
1346 free(inbuf);
1347 return len;
1348 } else
1349 return -2;
1350 } else
1351 return 0;
1352 }
1353 }
1354 return -1;
1355 }

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