/[cvs]/eggdrop1.9/src/net.c
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Revision 1.16 - (show annotations) (download) (as text)
Sun Jan 30 19:26:21 2000 UTC (19 years, 8 months ago) by fabian
Branch: MAIN
CVS Tags: eggdrop105020
Changes since 1.15: +154 -130 lines
File MIME type: text/x-chdr
cleanup3 patch

1 /*
2 * net.c -- handles:
3 * all raw network i/o
4 *
5 * $Id: net.c,v 1.15 2000/01/22 22:37:47 fabian 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> /* is this really necessary? */
23 #include <errno.h>
24 #if HAVE_UNISTD_H
25 # include <unistd.h>
26 #endif
27 #include <setjmp.h>
28
29 #if !HAVE_GETDTABLESIZE
30 # ifdef FD_SETSIZE
31 # define getdtablesize() FD_SETSIZE
32 # else
33 # define getdtablesize() 200
34 # endif
35 #endif
36
37 extern struct dcc_t *dcc;
38 extern int backgrd, use_stderr, resolve_timeout, dcc_total,
39 otraffic_irc_today, otraffic_bn_today,
40 otraffic_dcc_today, otraffic_filesys_today,
41 otraffic_trans_today, otraffic_unknown_today;
42
43 char hostname[121] = ""; /* Hostname can be specified in the config
44 file */
45 char myip[121] = ""; /* IP can be specified in the config file */
46 char firewall[121] = ""; /* Socks server for firewall */
47 int firewallport = 1080; /* Default port of Sock4/5 firewalls */
48 char botuser[21] = "eggdrop"; /* Username of the user running the bot */
49 int dcc_sanitycheck = 0; /* We should do some sanity checking on dcc
50 connections. */
51 sock_list *socklist = NULL; /* Enough to be safe */
52 int MAXSOCKS = 0;
53 jmp_buf alarmret; /* Env buffer for alarm() returns */
54
55 /* Types of proxy */
56 #define PROXY_SOCKS 1
57 #define PROXY_SUN 2
58
59
60 /* I need an UNSIGNED long for dcc type stuff
61 */
62 IP my_atoul(char *s)
63 {
64 IP ret = 0;
65
66 while ((*s >= '0') && (*s <= '9')) {
67 ret *= 10;
68 ret += ((*s) - '0');
69 s++;
70 }
71 return ret;
72 }
73
74 /* I read somewhere that memcpy() is broken on some machines.
75 * It's easy to replace, so i'm not gonna take any chances, because
76 * it's pretty important that it work correctly here.
77 *
78 * (Is this still valid?)
79 */
80 void my_memcpy(char *dest, char *src, int len)
81 {
82 while (len--)
83 *dest++ = *src++;
84 }
85
86 #ifndef HAVE_BZERO
87 /* bzero() is bsd-only, so here's one for non-bsd systems
88 */
89 void bzero(void *dest, int len)
90 {
91 while (len--)
92 *((char *) dest)++ = 0;
93 }
94 #endif
95
96 /* Initialize the socklist
97 */
98 void init_net()
99 {
100 int i;
101
102 for (i = 0; i < MAXSOCKS; i++) {
103 socklist[i].flags = SOCK_UNUSED;
104 }
105 }
106
107 int expmem_net()
108 {
109 int i, tot = 0;
110
111 Context;
112 for (i = 0; i < MAXSOCKS; i++) {
113 if (!(socklist[i].flags & SOCK_UNUSED)) {
114 if (socklist[i].inbuf != NULL)
115 tot += strlen(socklist[i].inbuf) + 1;
116 if (socklist[i].outbuf != NULL)
117 tot += socklist[i].outbuflen;
118 }
119 }
120 return tot;
121 }
122
123 /* Get my ip number
124 */
125 IP getmyip()
126 {
127 struct hostent *hp;
128 char s[121];
129 IP ip;
130 struct in_addr *in;
131
132 /* Could be pre-defined */
133 if (myip[0]) {
134 if ((myip[strlen(myip) - 1] >= '0') && (myip[strlen(myip) - 1] <= '9'))
135 return (IP) inet_addr(myip);
136 }
137 /* Also could be pre-defined */
138 if (hostname[0])
139 hp = gethostbyname(hostname);
140 else {
141 gethostname(s, 120);
142 hp = gethostbyname(s);
143 }
144 if (hp == NULL)
145 fatal("Hostname self-lookup failed.", 0);
146 in = (struct in_addr *) (hp->h_addr_list[0]);
147 ip = (IP) (in->s_addr);
148 return ip;
149 }
150
151 void neterror(char *s)
152 {
153 switch (errno) {
154 case EADDRINUSE:
155 strcpy(s, "Address already in use");
156 break;
157 case EADDRNOTAVAIL:
158 strcpy(s, "Address invalid on remote machine");
159 break;
160 case EAFNOSUPPORT:
161 strcpy(s, "Address family not supported");
162 break;
163 case EALREADY:
164 strcpy(s, "Socket already in use");
165 break;
166 case EBADF:
167 strcpy(s, "Socket descriptor is bad");
168 break;
169 case ECONNREFUSED:
170 strcpy(s, "Connection refused");
171 break;
172 case EFAULT:
173 strcpy(s, "Namespace segment violation");
174 break;
175 case EINPROGRESS:
176 strcpy(s, "Operation in progress");
177 break;
178 case EINTR:
179 strcpy(s, "Timeout");
180 break;
181 case EINVAL:
182 strcpy(s, "Invalid namespace");
183 break;
184 case EISCONN:
185 strcpy(s, "Socket already connected");
186 break;
187 case ENETUNREACH:
188 strcpy(s, "Network unreachable");
189 break;
190 case ENOTSOCK:
191 strcpy(s, "File descriptor, not a socket");
192 break;
193 case ETIMEDOUT:
194 strcpy(s, "Connection timed out");
195 break;
196 case ENOTCONN:
197 strcpy(s, "Socket is not connected");
198 break;
199 case EHOSTUNREACH:
200 strcpy(s, "Host is unreachable");
201 break;
202 case EPIPE:
203 strcpy(s, "Broken pipe");
204 break;
205 #ifdef ECONNRESET
206 case ECONNRESET:
207 strcpy(s, "Connection reset by peer");
208 break;
209 #endif
210 #ifdef EACCES
211 case EACCES:
212 strcpy(s, "Permission denied");
213 break;
214 #endif
215 case 0:
216 strcpy(s, "Error 0");
217 break;
218 default:
219 sprintf(s, "Unforseen error %d", errno);
220 break;
221 }
222 }
223
224 /* Return a free entry in the socket entry
225 */
226 int allocsock(int sock, int options)
227 {
228 int i;
229
230 Context;
231 for (i = 0; i < MAXSOCKS; i++) {
232 if (socklist[i].flags & SOCK_UNUSED) {
233 /* yay! there is table space */
234 socklist[i].inbuf = socklist[i].outbuf = NULL;
235 socklist[i].outbuflen = 0;
236 socklist[i].flags = options;
237 socklist[i].sock = sock;
238 return i;
239 }
240 }
241 fatal("Socket table is full!", 0);
242 return -1; /* Never reached */
243 }
244
245 /* Request a normal socket for i/o
246 */
247 void setsock(int sock, int options)
248 {
249 int i = allocsock(sock, options);
250 int parm;
251
252 if (((sock != STDOUT) || backgrd) &&
253 !(socklist[i].flags & SOCK_NONSOCK)) {
254 parm = 1;
255 setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (void *) &parm, sizeof(int));
256
257 parm = 0;
258 setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *) &parm, sizeof(int));
259 }
260 if (options & SOCK_LISTEN) {
261 /* Tris says this lets us grab the same port again next time */
262 parm = 1;
263 setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *) &parm, sizeof(int));
264 }
265 /* Yay async i/o ! */
266 fcntl(sock, F_SETFL, O_NONBLOCK);
267 }
268
269 int getsock(int options)
270 {
271 int sock = socket(AF_INET, SOCK_STREAM, 0);
272
273 if (sock < 0)
274 fatal("Can't open a socket at all!", 0);
275 setsock(sock, options);
276 return sock;
277 }
278
279 /* Done with a socket
280 */
281 void killsock(int sock)
282 {
283 int i;
284
285 for (i = 0; i < MAXSOCKS; i++) {
286 if ((socklist[i].sock == sock) && !(socklist[i].flags & SOCK_UNUSED)) {
287 close(socklist[i].sock);
288 if (socklist[i].inbuf != NULL) {
289 nfree(socklist[i].inbuf);
290 socklist[i].inbuf = NULL;
291 }
292 if (socklist[i].outbuf != NULL) {
293 nfree(socklist[i].outbuf);
294 socklist[i].outbuf = NULL;
295 socklist[i].outbuflen = 0;
296 }
297 socklist[i].flags = SOCK_UNUSED;
298 return;
299 }
300 }
301 putlog(LOG_MISC, "*", "Attempt to kill un-allocated socket %d !!", sock);
302 }
303
304 /* Send connection request to proxy
305 */
306 static int proxy_connect(int sock, char *host, int port, int proxy)
307 {
308 unsigned char x[10];
309 struct hostent *hp;
310 char s[30];
311 int i;
312
313 /* socks proxy */
314 if (proxy == PROXY_SOCKS) {
315 /* numeric IP? */
316 if ((host[strlen(host) - 1] >= '0') && (host[strlen(host) - 1] <= '9')) {
317 IP ip = ((IP) inet_addr(host)); /* drummer */
318 my_memcpy((char *) x, (char *) &ip, 4); /* Beige@Efnet */
319 } else {
320 /* no, must be host.domain */
321 if (!setjmp(alarmret)) {
322 alarm(resolve_timeout);
323 hp = gethostbyname(host);
324 alarm(0);
325 } else {
326 hp = NULL;
327 }
328 if (hp == NULL) {
329 killsock(sock);
330 return -2;
331 }
332 my_memcpy((char *) x, (char *) hp->h_addr, hp->h_length);
333 }
334 for (i = 0; i < MAXSOCKS; i++) {
335 if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].sock == sock))
336 socklist[i].flags |= SOCK_PROXYWAIT; /* drummer */
337 }
338 sprintf(s, "\004\001%c%c%c%c%c%c%s", (port >> 8) % 256, (port % 256),
339 x[0], x[1], x[2], x[3], botuser);
340 tputs(sock, s, strlen(botuser) + 9); /* drummer */
341 } else if (proxy == PROXY_SUN) {
342 sprintf(s, "%s %d\n", host, port);
343 tputs(sock, s, strlen(s)); /* drummer */
344 }
345 return sock;
346 }
347
348 /* Starts a connection attempt to a socket
349 *
350 * If given a normal hostname, this will be resolved to the corresponding
351 * IP address first. PLEASE try to use the non-blocking dns functions
352 * instead and then call this function with the IP address to avoid blocking.
353 *
354 * returns <0 if connection refused:
355 * -1 neterror() type error
356 * -2 can't resolve hostname
357 */
358 int open_telnet_raw(int sock, char *server, int sport)
359 {
360 struct sockaddr_in name;
361 struct hostent *hp;
362 char host[121];
363 int i, port;
364 volatile int proxy;
365
366 /* firewall? use socks */
367 if (firewall[0]) {
368 if (firewall[0] == '!') {
369 proxy = PROXY_SUN;
370 strcpy(host, &firewall[1]);
371 } else {
372 proxy = PROXY_SOCKS;
373 strcpy(host, firewall);
374 }
375 port = firewallport;
376 } else {
377 proxy = 0;
378 strcpy(host, server);
379 port = sport;
380 }
381 /* patch by tris for multi-hosted machines: */
382 bzero((char *) &name, sizeof(struct sockaddr_in));
383
384 name.sin_family = AF_INET;
385 name.sin_addr.s_addr = (myip[0] ? getmyip() : INADDR_ANY);
386 if (bind(sock, (struct sockaddr *) &name, sizeof(name)) < 0)
387 return -1;
388 bzero((char *) &name, sizeof(struct sockaddr_in));
389
390 name.sin_family = AF_INET;
391 name.sin_port = my_htons(port);
392 /* Numeric IP? */
393 if ((host[strlen(host) - 1] >= '0') && (host[strlen(host) - 1] <= '9'))
394 name.sin_addr.s_addr = inet_addr(host);
395 else {
396 /* No, must be host.domain */
397 debug0("WARNING: open_telnet_raw() is about to block in gethostbyname()!");
398 if (!setjmp(alarmret)) {
399 alarm(resolve_timeout);
400 hp = gethostbyname(host);
401 alarm(0);
402 } else {
403 hp = NULL;
404 }
405 if (hp == NULL)
406 return -2;
407 my_memcpy((char *) &name.sin_addr, hp->h_addr, hp->h_length);
408 name.sin_family = hp->h_addrtype;
409 }
410 for (i = 0; i < MAXSOCKS; i++) {
411 if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].sock == sock))
412 socklist[i].flags |= SOCK_CONNECT;
413 }
414 if (connect(sock, (struct sockaddr *) &name,
415 sizeof(struct sockaddr_in)) < 0) {
416 if (errno == EINPROGRESS) {
417 /* Firewall? announce connect attempt to proxy */
418 if (firewall[0])
419 return proxy_connect(sock, server, sport, proxy);
420 return sock; /* async success! */
421 } else
422 return -1;
423 }
424 /* Synchronous? :/ */
425 if (firewall[0])
426 return proxy_connect(sock, server, sport, proxy);
427 return sock;
428 }
429
430 /* Ordinary non-binary connection attempt */
431 int open_telnet(char *server, int port)
432 {
433 int sock = getsock(0),
434 ret = open_telnet_raw(sock, server, port);
435
436 if (ret < 0)
437 killsock(sock);
438 return ret;
439 }
440
441 /* Returns a socket number for a listening socket that will accept any
442 * connection -- port # is returned in port
443 */
444 int open_listen(int *port)
445 {
446 int sock;
447 unsigned int addrlen;
448 struct sockaddr_in name;
449
450 if (firewall[0]) {
451 /* FIXME: can't do listen port thru firewall yet */
452 putlog(LOG_MISC, "*", "!! Cant open a listen port (you are using a firewall)");
453 return -1;
454 }
455 sock = getsock(SOCK_LISTEN);
456 bzero((char *) &name, sizeof(struct sockaddr_in));
457
458 name.sin_family = AF_INET;
459 name.sin_port = my_htons(*port); /* 0 = just assign us a port */
460 name.sin_addr.s_addr = (myip[0] ? getmyip() : INADDR_ANY);
461 if (bind(sock, (struct sockaddr *) &name, sizeof(name)) < 0) {
462 killsock(sock);
463 return -1;
464 }
465 /* what port are we on? */
466 addrlen = sizeof(name);
467 if (getsockname(sock, (struct sockaddr *) &name, &addrlen) < 0) {
468 killsock(sock);
469 return -1;
470 }
471 *port = my_ntohs(name.sin_port);
472 if (listen(sock, 1) < 0) {
473 killsock(sock);
474 return -1;
475 }
476 return sock;
477 }
478
479 /* Given a network-style IP address, returns the hostname. The hostname
480 * will be in the "##.##.##.##" format if there was an error.
481 *
482 * NOTE: This function is depreciated. Try using the async dns approach
483 * instead.
484 */
485 char *hostnamefromip(unsigned long ip)
486 {
487 struct hostent *hp;
488 unsigned long addr = ip;
489 unsigned char *p;
490 static char s[UHOSTLEN];
491
492 if (!setjmp(alarmret)) {
493 alarm(resolve_timeout);
494 hp = gethostbyaddr((char *) &addr, sizeof(addr), AF_INET);
495 alarm(0);
496 } else {
497 hp = NULL;
498 }
499 if (hp == NULL) {
500 p = (unsigned char *) &addr;
501 sprintf(s, "%u.%u.%u.%u", p[0], p[1], p[2], p[3]);
502 return s;
503 }
504 strncpy(s, hp->h_name, UHOSTLEN - 1);
505 s[UHOSTLEN - 1] = 0;
506 return s;
507 }
508
509 /* Returns the given network byte order IP address in the
510 * dotted format - "##.##.##.##"
511 */
512 char *iptostr(IP ip)
513 {
514 struct in_addr a;
515
516 a.s_addr = ip;
517 return inet_ntoa(a);
518 }
519
520 /* Short routine to answer a connect received on a socket made previously
521 * by open_listen ... returns hostname of the caller & the new socket
522 * does NOT dispose of old "public" socket!
523 */
524 int answer(int sock, char *caller, unsigned long *ip, unsigned short *port,
525 int binary)
526 {
527 int new_sock;
528 unsigned int addrlen;
529 struct sockaddr_in from;
530 addrlen = sizeof(struct sockaddr);
531
532 new_sock = accept(sock, (struct sockaddr *) &from, &addrlen);
533 if (new_sock < 0)
534 return -1;
535 if (ip != NULL) {
536 *ip = from.sin_addr.s_addr;
537 /* This is now done asynchronously. We now only provide the IP address.
538 *
539 * strncpy(caller, hostnamefromip(*ip), 120);
540 */
541 strncpy(caller, iptostr(*ip), 120);
542 caller[120] = 0;
543 *ip = my_ntohl(*ip);
544 }
545 if (port != NULL)
546 *port = my_ntohs(from.sin_port);
547 /* Set up all the normal socket crap */
548 setsock(new_sock, (binary ? SOCK_BINARY : 0));
549 return new_sock;
550 }
551
552 /* Like open_telnet, but uses server & port specifications of dcc
553 */
554 int open_telnet_dcc(int sock, char *server, char *port)
555 {
556 int p;
557 unsigned long addr;
558 char sv[121];
559 unsigned char c[4];
560
561 if (port != NULL)
562 p = atoi(port);
563 else
564 p = 2000;
565 if (server != NULL)
566 addr = my_atoul(server);
567 else
568 addr = 0L;
569 if (addr < (1 << 24))
570 return -3; /* fake address */
571 c[0] = (addr >> 24) & 0xff;
572 c[1] = (addr >> 16) & 0xff;
573 c[2] = (addr >> 8) & 0xff;
574 c[3] = addr & 0xff;
575 sprintf(sv, "%u.%u.%u.%u", c[0], c[1], c[2], c[3]);
576 /* strcpy(sv,hostnamefromip(addr)); */
577 p = open_telnet_raw(sock, sv, p);
578 return p;
579 }
580
581 /* Attempts to read from all the sockets in socklist
582 * fills s with up to 511 bytes if available, and returns the array index
583 *
584 * on EOF: returns -1, with socket in len
585 * on socket error: returns -2
586 * if nothing is ready: returns -3
587 */
588 static int sockread(char *s, int *len)
589 {
590 fd_set fd;
591 int fds, i, x;
592 struct timeval t;
593 int grab = 511;
594
595 fds = getdtablesize();
596 #ifdef FD_SETSIZE
597 if (fds > FD_SETSIZE)
598 fds = FD_SETSIZE; /* Fixes YET ANOTHER freebsd bug!!! */
599 #endif
600 /* timeout: 1 sec */
601 t.tv_sec = 1;
602 t.tv_usec = 0;
603 FD_ZERO(&fd);
604 for (i = 0; i < MAXSOCKS; i++)
605 if (!(socklist[i].flags & SOCK_UNUSED)) {
606 if ((socklist[i].sock == STDOUT) && !backgrd)
607 FD_SET(STDIN, &fd);
608 else
609 FD_SET(socklist[i].sock, &fd);
610 }
611 #ifdef HPUX_HACKS
612 #ifndef HPUX10_HACKS
613 x = select(fds, (int *) &fd, (int *) NULL, (int *) NULL, &t);
614 #else
615 x = select(fds, &fd, NULL, NULL, &t);
616 #endif
617 #else
618 x = select(fds, &fd, NULL, NULL, &t);
619 #endif
620 if (x > 0) {
621 /* Something happened */
622 for (i = 0; i < MAXSOCKS; i++) {
623 if ((!(socklist[i].flags & SOCK_UNUSED)) &&
624 ((FD_ISSET(socklist[i].sock, &fd)) ||
625 ((socklist[i].sock == STDOUT) && (!backgrd) &&
626 (FD_ISSET(STDIN, &fd))))) {
627 if (socklist[i].flags & (SOCK_LISTEN | SOCK_CONNECT)) {
628 /* Listening socket -- don't read, just return activity */
629 /* Same for connection attempt */
630 /* (for strong connections, require a read to succeed first) */
631 if (socklist[i].flags & SOCK_PROXYWAIT) { /* drummer */
632 /* Hang around to get the return code from proxy */
633 grab = 10;
634 } else if (!(socklist[i].flags & SOCK_STRONGCONN)) {
635 debug1("net: connect! sock %d", socklist[i].sock);
636 s[0] = 0;
637 *len = 0;
638 return i;
639 }
640 } else if (socklist[i].flags & SOCK_PASS) {
641 s[0] = 0;
642 *len = 0;
643 return i;
644 }
645 if ((socklist[i].sock == STDOUT) && !backgrd)
646 x = read(STDIN, s, grab);
647 else
648 x = read(socklist[i].sock, s, grab);
649 if (x <= 0) { /* eof */
650 if (x == EAGAIN) {
651 s[0] = 0;
652 *len = 0;
653 return -3;
654 }
655 *len = socklist[i].sock;
656 socklist[i].flags &= ~SOCK_CONNECT;
657 debug1("net: eof!(read) socket %d", socklist[i].sock);
658 return -1;
659 }
660 s[x] = 0;
661 *len = x;
662 if (socklist[i].flags & SOCK_PROXYWAIT) {
663 debug2("net: socket: %d proxy errno: %d", socklist[i].sock, s[1]);
664 socklist[i].flags &= ~(SOCK_CONNECT | SOCK_PROXYWAIT);
665 switch (s[1]) {
666 case 90: /* Success */
667 s[0] = 0;
668 *len = 0;
669 return i;
670 case 91: /* Failed */
671 errno = ECONNREFUSED;
672 break;
673 case 92: /* No identd */
674 case 93: /* Identd said wrong username */
675 /* A better error message would be "socks misconfigured"
676 * or "identd not working" but this is simplest.
677 */
678 errno = ENETUNREACH;
679 break;
680 }
681 *len = socklist[i].sock;
682 return -1;
683 }
684 return i;
685 }
686 }
687 } else if (x == -1)
688 return -2; /* socket error */
689 else {
690 s[0] = 0;
691 *len = 0;
692 }
693 return -3;
694 }
695
696 /* sockgets: buffer and read from sockets
697 *
698 * Attempts to read from all registered sockets for up to one second. if
699 * after one second, no complete data has been received from any of the
700 * sockets, 's' will be empty, 'len' will be 0, and sockgets will return -3.
701 * if there is returnable data received from a socket, the data will be
702 * in 's' (null-terminated if non-binary), the length will be returned
703 * in len, and the socket number will be returned.
704 * normal sockets have their input buffered, and each call to sockgets
705 * will return one line terminated with a '\n'. binary sockets are not
706 * buffered and return whatever coems in as soon as it arrives.
707 * listening sockets will return an empty string when a connection comes in.
708 * connecting sockets will return an empty string on a successful connect,
709 * or EOF on a failed connect.
710 * if an EOF is detected from any of the sockets, that socket number will be
711 * put in len, and -1 will be returned.
712 * the maximum length of the string returned is 512 (including null)
713 */
714
715 int sockgets(char *s, int *len)
716 {
717 char xx[514], *p, *px;
718 int ret, i, data = 0;
719
720 Context;
721 for (i = 0; i < MAXSOCKS; i++) {
722 /* Check for stored-up data waiting to be processed */
723 if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].inbuf != NULL)) {
724 /* look for \r too cos windows can't follow RFCs */
725 p = strchr(socklist[i].inbuf, '\n');
726 if (p == NULL)
727 p = strchr(socklist[i].inbuf, '\r');
728 if (p != NULL) {
729 *p = 0;
730 if (strlen(socklist[i].inbuf) > 510)
731 socklist[i].inbuf[510] = 0;
732 strcpy(s, socklist[i].inbuf);
733 px = (char *) nmalloc(strlen(p + 1) + 1);
734 strcpy(px, p + 1);
735 nfree(socklist[i].inbuf);
736 if (px[0])
737 socklist[i].inbuf = px;
738 else {
739 nfree(px);
740 socklist[i].inbuf = NULL;
741 }
742 /* Strip CR if this was CR/LF combo */
743 if (s[strlen(s) - 1] == '\r')
744 s[strlen(s) - 1] = 0;
745 *len = strlen(s);
746 return socklist[i].sock;
747 }
748 }
749 /* Also check any sockets that might have EOF'd during write */
750 if (!(socklist[i].flags & SOCK_UNUSED)
751 && (socklist[i].flags & SOCK_EOFD)) {
752 Context;
753 s[0] = 0;
754 *len = socklist[i].sock;
755 return -1;
756 }
757 }
758 /* No pent-up data of any worth -- down to business */
759 Context;
760 *len = 0;
761 ret = sockread(xx, len);
762 if (ret < 0) {
763 s[0] = 0;
764 return ret;
765 }
766 /* Binary, listening and passed on sockets don't get buffered. */
767 if (socklist[ret].flags & SOCK_CONNECT) {
768 if (socklist[ret].flags & SOCK_STRONGCONN) {
769 socklist[ret].flags &= ~SOCK_STRONGCONN;
770 /* Buffer any data that came in, for future read */
771 socklist[ret].inbuf = (char *) nmalloc(strlen(xx) + 1);
772 strcpy(socklist[ret].inbuf, xx);
773 }
774 socklist[ret].flags &= ~SOCK_CONNECT;
775 s[0] = 0;
776 return socklist[ret].sock;
777 }
778 if (socklist[ret].flags & SOCK_BINARY) {
779 my_memcpy(s, xx, *len);
780 return socklist[ret].sock;
781 }
782 if ((socklist[ret].flags & SOCK_LISTEN) ||
783 (socklist[ret].flags & SOCK_PASS))
784 return socklist[ret].sock;
785 Context;
786 /* Might be necessary to prepend stored-up data! */
787 if (socklist[ret].inbuf != NULL) {
788 p = socklist[ret].inbuf;
789 socklist[ret].inbuf = (char *) nmalloc(strlen(p) + strlen(xx) + 1);
790 strcpy(socklist[ret].inbuf, p);
791 strcat(socklist[ret].inbuf, xx);
792 nfree(p);
793 if (strlen(socklist[ret].inbuf) < 512) {
794 strcpy(xx, socklist[ret].inbuf);
795 nfree(socklist[ret].inbuf);
796 socklist[ret].inbuf = NULL;
797 } else {
798 p = socklist[ret].inbuf;
799 socklist[ret].inbuf = (char *) nmalloc(strlen(p) - 509);
800 strcpy(socklist[ret].inbuf, p + 510);
801 *(p + 510) = 0;
802 strcpy(xx, p);
803 nfree(p);
804 /* (leave the rest to be post-pended later) */
805 }
806 }
807 Context;
808 /* Look for EOL marker; if it's there, i have something to show */
809 p = strchr(xx, '\n');
810 if (p == NULL)
811 p = strchr(xx, '\r');
812 if (p != NULL) {
813 *p = 0;
814 strcpy(s, xx);
815 strcpy(xx, p + 1);
816 if (s[strlen(s) - 1] == '\r')
817 s[strlen(s) - 1] = 0;
818 data = 1; /* DCC_CHAT may now need to process a
819 blank line */
820 /* NO! */
821 /* if (!s[0]) strcpy(s," "); */
822 } else {
823 s[0] = 0;
824 if (strlen(xx) >= 510) {
825 /* String is too long, so just insert fake \n */
826 strcpy(s, xx);
827 xx[0] = 0;
828 data = 1;
829 }
830 }
831 Context;
832 *len = strlen(s);
833 /* Anything left that needs to be saved? */
834 if (!xx[0]) {
835 if (data)
836 return socklist[ret].sock;
837 else
838 return -3;
839 }
840 Context;
841 /* Prepend old data back */
842 if (socklist[ret].inbuf != NULL) {
843 Context;
844 p = socklist[ret].inbuf;
845 socklist[ret].inbuf = (char *) nmalloc(strlen(p) + strlen(xx) + 1);
846 strcpy(socklist[ret].inbuf, xx);
847 strcat(socklist[ret].inbuf, p);
848 nfree(p);
849 } else {
850 Context;
851 socklist[ret].inbuf = (char *) nmalloc(strlen(xx) + 1);
852 strcpy(socklist[ret].inbuf, xx);
853 }
854 Context;
855 if (data) {
856 Context;
857 return socklist[ret].sock;
858 } else {
859 Context;
860 return -3;
861 }
862 }
863
864 /* Dump something to a socket
865 *
866 * NOTE: Do NOT put Contexts in here if you want DEBUG to be meaningful!!
867 */
868 void tputs(register int z, char *s, unsigned int len)
869 {
870 register int i, x, idx;
871 char *p;
872 static int inhere = 0;
873
874 if (z < 0)
875 return; /* um... HELLO?! sanity check please! */
876 if (((z == STDOUT) || (z == STDERR)) && (!backgrd || use_stderr)) {
877 write(z, s, len);
878 return;
879 }
880 for (i = 0; i < MAXSOCKS; i++) {
881 if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].sock == z)) {
882 for (idx = 0; idx < dcc_total; idx++) {
883 if (dcc[idx].sock == z) {
884 if (dcc[idx].type) {
885 if (dcc[idx].type->name) {
886 if (!strncmp(dcc[idx].type->name, "BOT", 3)) {
887 otraffic_bn_today += len;
888 break;
889 } else if (!strcmp(dcc[idx].type->name, "SERVER")) {
890 otraffic_irc_today += len;
891 break;
892 } else if (!strncmp(dcc[idx].type->name, "CHAT", 4)) {
893 otraffic_dcc_today += len;
894 break;
895 } else if (!strncmp(dcc[idx].type->name, "FILES", 5)) {
896 otraffic_filesys_today += len;
897 break;
898 } else if (!strcmp(dcc[idx].type->name, "SEND")) {
899 otraffic_trans_today += len;
900 break;
901 } else if (!strncmp(dcc[idx].type->name, "GET", 3)) {
902 otraffic_trans_today += len;
903 break;
904 } else {
905 otraffic_unknown_today += len;
906 break;
907 }
908 }
909 }
910 }
911 }
912
913 if (socklist[i].outbuf != NULL) {
914 /* Already queueing: just add it */
915 p = (char *) nrealloc(socklist[i].outbuf, socklist[i].outbuflen + len);
916 my_memcpy(p + socklist[i].outbuflen, s, len);
917 socklist[i].outbuf = p;
918 socklist[i].outbuflen += len;
919 return;
920 }
921 /* Try. */
922 x = write(z, s, len);
923 if (x == (-1))
924 x = 0;
925 if (x < len) {
926 /* Socket is full, queue it */
927 socklist[i].outbuf = (char *) nmalloc(len - x);
928 my_memcpy(socklist[i].outbuf, &s[x], len - x);
929 socklist[i].outbuflen = len - x;
930 }
931 return;
932 }
933 }
934 /* Make sure we don't cause a crash by looping here */
935 if (!inhere) {
936 inhere = 1;
937
938 putlog(LOG_MISC, "*", "!!! writing to nonexistent socket: %d", z);
939 s[strlen(s) - 1] = 0;
940 putlog(LOG_MISC, "*", "!-> '%s'", s);
941
942 inhere = 0;
943 }
944 }
945
946 /* tputs might queue data for sockets, let's dump as much of it as
947 * possible.
948 */
949 void dequeue_sockets()
950 {
951 int i, x;
952
953 for (i = 0; i < MAXSOCKS; i++) {
954 if (!(socklist[i].flags & SOCK_UNUSED) &&
955 (socklist[i].outbuf != NULL)) {
956 /* Trick tputs into doing the work */
957 x = write(socklist[i].sock, socklist[i].outbuf,
958 socklist[i].outbuflen);
959 if ((x < 0) && (errno != EAGAIN)
960 #ifdef EBADSLT
961 && (errno != EBADSLT)
962 #endif
963 #ifdef ENOTCONN
964 && (errno != ENOTCONN)
965 #endif
966 ) {
967 /* This detects an EOF during writing */
968 debug3("net: eof!(write) socket %d (%s,%d)", socklist[i].sock,
969 strerror(errno), errno);
970 socklist[i].flags |= SOCK_EOFD;
971 } else if (x == socklist[i].outbuflen) {
972 /* If the whole buffer was sent, nuke it */
973 nfree(socklist[i].outbuf);
974 socklist[i].outbuf = NULL;
975 socklist[i].outbuflen = 0;
976 } else if (x > 0) {
977 char *p = socklist[i].outbuf;
978
979 /* This removes any sent bytes from the beginning of the buffer */
980 socklist[i].outbuf = (char *) nmalloc(socklist[i].outbuflen - x);
981 my_memcpy(socklist[i].outbuf, p + x, socklist[i].outbuflen - x);
982 socklist[i].outbuflen -= x;
983 nfree(p);
984 }
985
986 /* All queued data was sent. Call handler if one exists and the
987 * dcc entry wants it.
988 */
989 if (!socklist[i].outbuf) {
990 int idx = findanyidx(socklist[i].sock);
991
992 if ((idx > 0) && dcc[idx].type && dcc[idx].type->outdone)
993 dcc[idx].type->outdone(idx);
994 }
995 }
996 }
997 }
998
999
1000 /*
1001 * Debugging stuff
1002 */
1003
1004 void tell_netdebug(int idx)
1005 {
1006 int i;
1007 char s[80];
1008
1009 dprintf(idx, "Open sockets:");
1010 for (i = 0; i < MAXSOCKS; i++) {
1011 if (!(socklist[i].flags & SOCK_UNUSED)) {
1012 sprintf(s, " %d", socklist[i].sock);
1013 if (socklist[i].flags & SOCK_BINARY)
1014 strcat(s, " (binary)");
1015 if (socklist[i].flags & SOCK_LISTEN)
1016 strcat(s, " (listen)");
1017 if (socklist[i].flags & SOCK_PASS)
1018 strcat(s, " (passed on)");
1019 if (socklist[i].flags & SOCK_CONNECT)
1020 strcat(s, " (connecting)");
1021 if (socklist[i].flags & SOCK_STRONGCONN)
1022 strcat(s, " (strong)");
1023 if (socklist[i].flags & SOCK_NONSOCK)
1024 strcat(s, " (file)");
1025 if (socklist[i].inbuf != NULL)
1026 sprintf(&s[strlen(s)], " (inbuf: %04X)", strlen(socklist[i].inbuf));
1027 if (socklist[i].outbuf != NULL)
1028 sprintf(&s[strlen(s)], " (outbuf: %06lX)", socklist[i].outbuflen);
1029 strcat(s, ",");
1030 dprintf(idx, "%s", s);
1031 }
1032 }
1033 dprintf(idx, " done.\n");
1034 }
1035
1036 /* Security-flavoured sanity checking on DCC connections of all sorts can be
1037 * done with this routine. Feed it the proper information from your DCC
1038 * before you attempt the connection, and this will make an attempt at
1039 * figuring out if the connection is really that person, or someone screwing
1040 * around. It's not foolproof, but anything that fails this check probably
1041 * isn't going to work anyway due to masquerading firewalls, NAT routers,
1042 * or bugs in mIRC.
1043 */
1044 int sanitycheck_dcc(char *nick, char *from, char *ipaddy, char *port)
1045 {
1046 /* According to the latest RFC, the clients SHOULD be able to handle
1047 * DNS names that are up to 255 characters long. This is not broken.
1048 */
1049 char badaddress[16];
1050 IP ip = my_atoul(ipaddy);
1051 int prt = atoi(port);
1052
1053 /* It is disabled HERE so we only have to check in *one* spot! */
1054 if (!dcc_sanitycheck)
1055 return 1;
1056 Context; /* This should be pretty solid, but
1057 something _might_ break. */
1058 if (prt < 1) {
1059 putlog(LOG_MISC, "*", "ALERT: (%s!%s) specified an impossible port of %u!",
1060 nick, from, prt);
1061 return 0;
1062 }
1063 sprintf(badaddress, "%u.%u.%u.%u", (ip >> 24) & 0xff, (ip >> 16) & 0xff,
1064 (ip >> 8) & 0xff, ip & 0xff);
1065 if (ip < (1 << 24)) {
1066 putlog(LOG_MISC, "*", "ALERT: (%s!%s) specified an impossible IP of %s!",
1067 nick, from, badaddress);
1068 return 0;
1069 }
1070 return 1;
1071 }
1072
1073 int hostsanitycheck_dcc(char *nick, char *from, IP ip, char *dnsname,
1074 char *prt)
1075 {
1076 /* According to the latest RFC, the clients SHOULD be able to handle
1077 * DNS names that are up to 255 characters long. This is not broken.
1078 */
1079 char hostname[256], badaddress[16];
1080
1081 /* It is disabled HERE so we only have to check in *one* spot! */
1082 if (!dcc_sanitycheck)
1083 return 1;
1084 Context; /* This should be pretty solid, but
1085 something _might_ break. */
1086 sprintf(badaddress, "%u.%u.%u.%u", (ip >> 24) & 0xff, (ip >> 16) & 0xff,
1087 (ip >> 8) & 0xff, ip & 0xff);
1088 /* These should pad like crazy with zeros, since 120 bytes or so is
1089 * where the routines providing our data currently lose interest. I'm
1090 * using the n-variant in case someone changes that...
1091 */
1092 strncpy(hostname, extracthostname(from), 255);
1093 hostname[255] = 0;
1094 if (!strcasecmp(hostname, dnsname)) {
1095 putlog(LOG_DEBUG, "*", "DNS information for submitted IP checks out.");
1096 return 1;
1097 }
1098 if (!strcmp(badaddress, dnsname))
1099 putlog(LOG_MISC, "*", "ALERT: (%s!%s) sent a DCC request with bogus IP information of %s port %u!",
1100 nick, from, badaddress, prt);
1101 else
1102 return 1; /* <- usually happens when we have
1103 a user with an unresolved hostmask! */
1104 return 0;
1105 }
1106
1107 /* Checks wether the referenced socket has data queued.
1108 *
1109 * Returns true if the incoming/outgoing (depending on 'type') queues
1110 * contain data, otherwise false.
1111 */
1112 int sock_has_data(int type, int sock)
1113 {
1114 int ret = 0, i;
1115
1116 for (i = 0; i < MAXSOCKS; i++)
1117 if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].sock == sock))
1118 break;
1119 if (i < MAXSOCKS) {
1120 switch (type) {
1121 case SOCK_DATA_OUTGOING:
1122 ret = (socklist[i].outbuf != NULL);
1123 break;
1124 case SOCK_DATA_INCOMING:
1125 ret = (socklist[i].inbuf != NULL);
1126 break;
1127 }
1128 }
1129 return ret;
1130 }

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