/[cvs]/eggdrop1.9/src/net.c
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Revision 1.10 - (show annotations) (download) (as text)
Sun Dec 19 16:06:34 1999 UTC (19 years, 6 months ago) by fabian
Branch: MAIN
Changes since 1.9: +41 -1 lines
File MIME type: text/x-chdr
G`Quann's traffic patch

1 /*
2 * net.c -- handles:
3 * all raw network i/o
4 *
5 * This is hereby released into the public domain.
6 * Robey Pointer, robey@netcom.com
7 */
8
9 #include "main.h"
10 #include <limits.h>
11 #include <string.h>
12 #include <netdb.h>
13 #include <sys/socket.h>
14 #if HAVE_SYS_SELECT_H
15 #include <sys/select.h>
16 #endif
17 #include <netinet/in.h>
18 #include <arpa/inet.h> /* is this really necessary? */
19 #include <errno.h>
20 #if HAVE_UNISTD_H
21 #include <unistd.h>
22 #endif
23 #include <fcntl.h>
24 #include <setjmp.h>
25
26 #if !HAVE_GETDTABLESIZE
27 #ifdef FD_SETSIZE
28 #define getdtablesize() FD_SETSIZE
29 #else
30 #define getdtablesize() 200
31 #endif
32 #endif
33
34 extern int backgrd;
35 extern int use_stderr;
36 extern int resolve_timeout;
37 extern int dcc_total;
38 extern struct dcc_t *dcc;
39
40 char hostname[121] = ""; /* hostname can be specified in the config
41 * file */
42 char myip[121] = ""; /* IP can be specified in the config file */
43 char firewall[121] = ""; /* socks server for firewall */
44 int firewallport = 1080; /* default port of Sock4/5 firewalls */
45 char botuser[21] = "eggdrop"; /* username of the user running the bot */
46 int dcc_sanitycheck = 0; /* we should do some sanity checking on dcc
47 * connections. */
48 sock_list *socklist = 0; /* enough to be safe */
49 int MAXSOCKS = 0;
50 extern int otraffic_irc_today;
51 extern int otraffic_bn_today;
52 extern int otraffic_dcc_today;
53 extern int otraffic_filesys_today;
54 extern int otraffic_trans_today;
55 extern int otraffic_unknown_today;
56
57 /* types of proxy */
58 #define PROXY_SOCKS 1
59 #define PROXY_SUN 2
60
61 jmp_buf alarmret; /* env buffer for alarm() returns */
62
63 /* i need an UNSIGNED long for dcc type stuff */
64 IP my_atoul(char *s)
65 {
66 IP ret = 0;
67
68 while ((*s >= '0') && (*s <= '9')) {
69 ret *= 10;
70 ret += ((*s) - '0');
71 s++;
72 }
73 return ret;
74 }
75
76 /* i read somewhere that memcpy() is broken on some machines */
77 /* it's easy to replace, so i'm not gonna take any chances, because
78 * it's pretty important that it work correctly here */
79 void my_memcpy(char *dest, char *src, int len)
80 {
81 while (len--)
82 *dest++ = *src++;
83 }
84
85 #ifndef HAVE_BZERO
86 /* bzero() is bsd-only, so here's one for non-bsd systems */
87 void bzero(char *dest, int len)
88 {
89 while (len--)
90 *dest++ = 0;
91 }
92 #endif
93
94 /* initialize the socklist */
95 void init_net()
96 {
97 int i;
98
99 for (i = 0; i < MAXSOCKS; i++) {
100 socklist[i].flags = SOCK_UNUSED;
101 }
102 }
103
104 int expmem_net()
105 {
106 int i, tot = 0;
107
108 Context;
109 for (i = 0; i < MAXSOCKS; i++) {
110 if (!(socklist[i].flags & SOCK_UNUSED)) {
111 if (socklist[i].inbuf != NULL)
112 tot += strlen(socklist[i].inbuf) + 1;
113 if (socklist[i].outbuf != NULL)
114 tot += socklist[i].outbuflen;
115 }
116 }
117 return tot;
118 }
119
120 /* get my ip number */
121 IP getmyip()
122 {
123 struct hostent *hp;
124 char s[121];
125 IP ip;
126 struct in_addr *in;
127
128 /* could be pre-defined */
129 if (myip[0]) {
130 if ((myip[strlen(myip) - 1] >= '0') && (myip[strlen(myip) - 1] <= '9'))
131 return (IP) inet_addr(myip);
132 }
133 /* also could be pre-defined */
134 if (hostname[0])
135 hp = gethostbyname(hostname);
136 else {
137 gethostname(s, 120);
138 hp = gethostbyname(s);
139 }
140 if (hp == NULL)
141 fatal("Hostname self-lookup failed.", 0);
142 in = (struct in_addr *) (hp->h_addr_list[0]);
143 ip = (IP) (in->s_addr);
144 return ip;
145 }
146
147 void neterror(char *s)
148 {
149 switch (errno) {
150 case EADDRINUSE:
151 strcpy(s, "Address already in use");
152 break;
153 case EADDRNOTAVAIL:
154 strcpy(s, "Address invalid on remote machine");
155 break;
156 case EAFNOSUPPORT:
157 strcpy(s, "Address family not supported");
158 break;
159 case EALREADY:
160 strcpy(s, "Socket already in use");
161 break;
162 case EBADF:
163 strcpy(s, "Socket descriptor is bad");
164 break;
165 case ECONNREFUSED:
166 strcpy(s, "Connection refused");
167 break;
168 case EFAULT:
169 strcpy(s, "Namespace segment violation");
170 break;
171 case EINPROGRESS:
172 strcpy(s, "Operation in progress");
173 break;
174 case EINTR:
175 strcpy(s, "Timeout");
176 break;
177 case EINVAL:
178 strcpy(s, "Invalid namespace");
179 break;
180 case EISCONN:
181 strcpy(s, "Socket already connected");
182 break;
183 case ENETUNREACH:
184 strcpy(s, "Network unreachable");
185 break;
186 case ENOTSOCK:
187 strcpy(s, "File descriptor, not a socket");
188 break;
189 case ETIMEDOUT:
190 strcpy(s, "Connection timed out");
191 break;
192 case ENOTCONN:
193 strcpy(s, "Socket is not connected");
194 break;
195 case EHOSTUNREACH:
196 strcpy(s, "Host is unreachable");
197 break;
198 case EPIPE:
199 strcpy(s, "Broken pipe");
200 break;
201 #ifdef ECONNRESET
202 case ECONNRESET:
203 strcpy(s, "Connection reset by peer");
204 break;
205 #endif
206 #ifdef EACCES
207 case EACCES:
208 strcpy(s, "Permission denied");
209 break;
210 #endif
211 case 0:
212 strcpy(s, "Error 0");
213 break;
214 default:
215 sprintf(s, "Unforseen error %d", errno);
216 break;
217 }
218 }
219
220 /* return a free entry in the socket entry */
221 int allocsock(int sock, int options)
222 {
223 int i;
224
225 Context;
226 for (i = 0; i < MAXSOCKS; i++) {
227 if (socklist[i].flags & SOCK_UNUSED) {
228 /* yay! there is table space */
229 socklist[i].inbuf = socklist[i].outbuf = NULL;
230 socklist[i].outbuflen = 0;
231 socklist[i].flags = options;
232 socklist[i].sock = sock;
233 return i;
234 }
235 }
236 fatal("Socket table is full!", 0);
237 return -1; /* never reached */
238 }
239
240 /* request a normal socket for i/o */
241 void setsock(int sock, int options)
242 {
243 int i = allocsock(sock, options);
244 int parm;
245
246 if (((sock != STDOUT) || backgrd) &&
247 !(socklist[i].flags & SOCK_NONSOCK)) {
248 parm = 1;
249 setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (void *) &parm, sizeof(int));
250
251 parm = 0;
252 setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *) &parm, sizeof(int));
253 }
254 if (options & SOCK_LISTEN) {
255 /* Tris says this lets us grab the same port again next time */
256 parm = 1;
257 setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *) &parm,
258 sizeof(int));
259 }
260 /* yay async i/o ! */
261 fcntl(sock, F_SETFL, O_NONBLOCK);
262 }
263
264 int getsock(int options)
265 {
266 int sock = socket(AF_INET, SOCK_STREAM, 0);
267
268 if (sock < 0)
269 fatal("Can't open a socket at all!", 0);
270 setsock(sock, options);
271 return sock;
272 }
273
274 /* done with a socket */
275 void killsock(int sock)
276 {
277 int i;
278
279 for (i = 0; i < MAXSOCKS; i++) {
280 if ((socklist[i].sock == sock) && !(socklist[i].flags & SOCK_UNUSED)) {
281 close(socklist[i].sock);
282 if (socklist[i].inbuf != NULL) {
283 nfree(socklist[i].inbuf);
284 socklist[i].inbuf = NULL;
285 }
286 if (socklist[i].outbuf != NULL) {
287 nfree(socklist[i].outbuf);
288 socklist[i].outbuf = NULL;
289 socklist[i].outbuflen = 0;
290 }
291 socklist[i].flags = SOCK_UNUSED;
292 return;
293 }
294 }
295 putlog(LOG_MISC, "*", "Attempt to kill un-allocated socket %d !!", sock);
296 }
297
298 /* send connection request to proxy */
299 static int proxy_connect(int sock, char *host, int port, int proxy)
300 {
301 unsigned char x[10];
302 struct hostent *hp;
303 char s[30];
304 int i;
305
306 /* socks proxy */
307 if (proxy == PROXY_SOCKS) {
308 /* numeric IP? */
309 if ((host[strlen(host) - 1] >= '0') && (host[strlen(host) - 1] <= '9')) {
310 IP ip = ((IP) inet_addr(host)); /* drummer */
311 my_memcpy((char *) x, (char *) &ip, 4); /* Beige@Efnet */
312 } else {
313 /* no, must be host.domain */
314 if (!setjmp(alarmret)) {
315 alarm(resolve_timeout);
316 hp = gethostbyname(host);
317 alarm(0);
318 } else {
319 hp = NULL;
320 }
321 if (hp == NULL) {
322 killsock(sock);
323 return -2;
324 }
325 my_memcpy((char *) x, (char *) hp->h_addr, hp->h_length);
326 }
327 for (i = 0; i < MAXSOCKS; i++) {
328 if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].sock == sock))
329 socklist[i].flags |= SOCK_PROXYWAIT; /* drummer */
330 }
331 sprintf(s, "\004\001%c%c%c%c%c%c%s", (port >> 8) % 256, (port % 256),
332 x[0], x[1], x[2], x[3], botuser);
333 tputs(sock, s, strlen(botuser) + 9); /* drummer */
334 } else if (proxy == PROXY_SUN) {
335 sprintf(s, "%s %d\n", host, port);
336 tputs(sock, s, strlen(s)); /* drummer */
337 }
338 return sock;
339 }
340
341 /* starts a connection attempt to a socket
342 *
343 * If given a normal hostname, this will be resolved to the corresponding
344 * IP address first. PLEASE try to use the non-blocking dns functions
345 * instead and then call this function with the IP address to avoid blocking.
346 *
347 * returns <0 if connection refused:
348 * -1 neterror() type error
349 * -2 can't resolve hostname */
350 int open_telnet_raw(int sock, char *server, int sport)
351 {
352 struct sockaddr_in name;
353 struct hostent *hp;
354 char host[121];
355 int i, port;
356 volatile int proxy;
357
358 /* firewall? use socks */
359 if (firewall[0]) {
360 if (firewall[0] == '!') {
361 proxy = PROXY_SUN;
362 strcpy(host, &firewall[1]);
363 } else {
364 proxy = PROXY_SOCKS;
365 strcpy(host, firewall);
366 }
367 port = firewallport;
368 } else {
369 proxy = 0;
370 strcpy(host, server);
371 port = sport;
372 }
373 /* patch by tris for multi-hosted machines: */
374 bzero((char *) &name, sizeof(struct sockaddr_in));
375
376 name.sin_family = AF_INET;
377 name.sin_addr.s_addr = (myip[0] ? getmyip() : INADDR_ANY);
378 if (bind(sock, (struct sockaddr *) &name, sizeof(name)) < 0)
379 return -1;
380 bzero((char *) &name, sizeof(struct sockaddr_in));
381
382 name.sin_family = AF_INET;
383 name.sin_port = my_htons(port);
384 /* numeric IP? */
385 if ((host[strlen(host) - 1] >= '0') && (host[strlen(host) - 1] <= '9'))
386 name.sin_addr.s_addr = inet_addr(host);
387 else {
388 /* no, must be host.domain */
389 debug0("Warning: open_telnet_raw() is about to block in gethostbyname()!");
390 if (!setjmp(alarmret)) {
391 alarm(resolve_timeout);
392 hp = gethostbyname(host);
393 alarm(0);
394 } else {
395 hp = NULL;
396 }
397 if (hp == NULL)
398 return -2;
399 my_memcpy((char *) &name.sin_addr, hp->h_addr, hp->h_length);
400 name.sin_family = hp->h_addrtype;
401 }
402 for (i = 0; i < MAXSOCKS; i++) {
403 if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].sock == sock))
404 socklist[i].flags |= SOCK_CONNECT;
405 }
406 if (connect(sock, (struct sockaddr *) &name,
407 sizeof(struct sockaddr_in)) < 0) {
408 if (errno == EINPROGRESS) {
409 /* firewall? announce connect attempt to proxy */
410 if (firewall[0])
411 return proxy_connect(sock, server, sport, proxy);
412 return sock; /* async success! */
413 } else
414 return -1;
415 }
416 /* synchronous? :/ */
417 if (firewall[0])
418 return proxy_connect(sock, server, sport, proxy);
419 return sock;
420 }
421
422 /* ordinary non-binary connection attempt */
423 int open_telnet(char *server, int port)
424 {
425 int sock = getsock(0),
426 ret = open_telnet_raw(sock, server, port);
427
428 if (ret < 0)
429 killsock(sock);
430 return ret;
431 }
432
433 /* returns a socket number for a listening socket that will accept any
434 * connection -- port # is returned in port */
435 int open_listen(int *port)
436 {
437 int sock, addrlen;
438 struct sockaddr_in name;
439
440 if (firewall[0]) {
441 /* FIXME: can't do listen port thru firewall yet */
442 putlog(LOG_MISC, "*", "!! Cant open a listen port (you are using a firewall)");
443 return -1;
444 }
445 sock = getsock(SOCK_LISTEN);
446 bzero((char *) &name, sizeof(struct sockaddr_in));
447
448 name.sin_family = AF_INET;
449 name.sin_port = my_htons(*port); /* 0 = just assign us a port */
450 name.sin_addr.s_addr = (myip[0] ? getmyip() : INADDR_ANY);
451 if (bind(sock, (struct sockaddr *) &name, sizeof(name)) < 0) {
452 killsock(sock);
453 return -1;
454 }
455 /* what port are we on? */
456 addrlen = sizeof(name);
457 if (getsockname(sock, (struct sockaddr *) &name, &addrlen) < 0) {
458 killsock(sock);
459 return -1;
460 }
461 *port = my_ntohs(name.sin_port);
462 if (listen(sock, 1) < 0) {
463 killsock(sock);
464 return -1;
465 }
466 return sock;
467 }
468
469 /* Given a network-style IP address, returns the hostname. The hostname
470 * will be in the "##.##.##.##" format if there was an error.
471 *
472 * NOTE: This function is depreciated. Try using the async dns approach
473 * instead. */
474 char *hostnamefromip(unsigned long ip)
475 {
476 struct hostent *hp;
477 unsigned long addr = ip;
478 unsigned char *p;
479 static char s[UHOSTLEN];
480
481 if (!setjmp(alarmret)) {
482 alarm(resolve_timeout);
483 hp = gethostbyaddr((char *) &addr, sizeof(addr), AF_INET);
484 alarm(0);
485 } else {
486 hp = NULL;
487 }
488 if (hp == NULL) {
489 p = (unsigned char *) &addr;
490 sprintf(s, "%u.%u.%u.%u", p[0], p[1], p[2], p[3]);
491 return s;
492 }
493 strncpy(s, hp->h_name, UHOSTLEN - 1);
494 s[UHOSTLEN - 1] = 0;
495 return s;
496 }
497
498 /* Returns the given network byte order IP address in the
499 * dotted format - "##.##.##.##" */
500 char *iptostr(IP ip)
501 {
502 struct in_addr a;
503
504 a.s_addr = ip;
505 return inet_ntoa(a);
506 }
507
508 /* short routine to answer a connect received on a socket made previously
509 * by open_listen ... returns hostname of the caller & the new socket
510 * does NOT dispose of old "public" socket! */
511 int answer(int sock, char *caller, unsigned long *ip,
512 unsigned short *port, int binary)
513 {
514 int new_sock, addrlen;
515 struct sockaddr_in from;
516 addrlen = sizeof(struct sockaddr);
517
518 new_sock = accept(sock, (struct sockaddr *) &from, &addrlen);
519 if (new_sock < 0)
520 return -1;
521 if (ip != NULL) {
522 *ip = from.sin_addr.s_addr;
523 /* This is now done asynchronously. Instead, we just provide the
524 * IP address.
525 * strncpy(caller, hostnamefromip(*ip), 120);
526 */
527 strncpy(caller, iptostr(*ip), 120);
528 caller[120] = 0;
529 *ip = my_ntohl(*ip);
530 }
531 if (port != NULL)
532 *port = my_ntohs(from.sin_port);
533 /* set up all the normal socket crap */
534 setsock(new_sock, (binary ? SOCK_BINARY : 0));
535 return new_sock;
536 }
537
538 /* like open_telnet, but uses server & port specifications of dcc */
539 int open_telnet_dcc(int sock, char *server, char *port)
540 {
541 int p;
542 unsigned long addr;
543 char sv[121];
544 unsigned char c[4];
545
546 if (port != NULL)
547 p = atoi(port);
548 else
549 p = 2000;
550 if (server != NULL)
551 addr = my_atoul(server);
552 else
553 addr = 0L;
554 if (addr < (1 << 24))
555 return -3; /* fake address */
556 c[0] = (addr >> 24) & 0xff;
557 c[1] = (addr >> 16) & 0xff;
558 c[2] = (addr >> 8) & 0xff;
559 c[3] = addr & 0xff;
560 sprintf(sv, "%u.%u.%u.%u", c[0], c[1], c[2], c[3]);
561 /* strcpy(sv,hostnamefromip(addr)); */
562 p = open_telnet_raw(sock, sv, p);
563 return p;
564 }
565
566 /* all new replacements for mtgets/mtread */
567
568 /* attempts to read from all the sockets in socklist
569 * fills s with up to 511 bytes if available, and returns the array index
570 * on EOF, returns -1, with socket in len
571 * on socket error, returns -2
572 * if nothing is ready, returns -3 */
573 static int sockread(char *s, int *len)
574 {
575 fd_set fd;
576 int fds, i, x;
577 struct timeval t;
578 int grab = 511;
579
580 fds = getdtablesize();
581 #ifdef FD_SETSIZE
582 if (fds > FD_SETSIZE)
583 fds = FD_SETSIZE; /* fixes YET ANOTHER freebsd bug!!! */
584 #endif
585 /* timeout: 1 sec */
586 t.tv_sec = 1;
587 t.tv_usec = 0;
588 FD_ZERO(&fd);
589 for (i = 0; i < MAXSOCKS; i++)
590 if (!(socklist[i].flags & SOCK_UNUSED)) {
591 if ((socklist[i].sock == STDOUT) && !backgrd)
592 FD_SET(STDIN, &fd);
593 else
594 FD_SET(socklist[i].sock, &fd);
595 }
596 #ifdef HPUX_HACKS
597 #ifndef HPUX10_HACKS
598 x = select(fds, (int *) &fd, (int *) NULL, (int *) NULL, &t);
599 #else
600 x = select(fds, &fd, NULL, NULL, &t);
601 #endif
602 #else
603 x = select(fds, &fd, NULL, NULL, &t);
604 #endif
605 if (x > 0) {
606 /* something happened */
607 for (i = 0; i < MAXSOCKS; i++) {
608 if ((!(socklist[i].flags & SOCK_UNUSED)) &&
609 ((FD_ISSET(socklist[i].sock, &fd)) ||
610 ((socklist[i].sock == STDOUT) && (!backgrd) &&
611 (FD_ISSET(STDIN, &fd))))) {
612 if (socklist[i].flags & (SOCK_LISTEN | SOCK_CONNECT)) {
613 /* listening socket -- don't read, just return activity */
614 /* same for connection attempt */
615 /* (for strong connections, require a read to succeed first) */
616 if (socklist[i].flags & SOCK_PROXYWAIT) { /* drummer */
617 /* hang around to get the return code from proxy */
618 grab = 10;
619 } else if (!(socklist[i].flags & SOCK_STRONGCONN)) {
620 debug1("net: connect! sock %d", socklist[i].sock);
621 s[0] = 0;
622 *len = 0;
623 return i;
624 }
625 } else if (socklist[i].flags & SOCK_PASS) {
626 s[0] = 0;
627 *len = 0;
628 return i;
629 }
630 if ((socklist[i].sock == STDOUT) && !backgrd)
631 x = read(STDIN, s, grab);
632 else
633 x = read(socklist[i].sock, s, grab);
634 if (x <= 0) { /* eof */
635 if (x == EAGAIN) {
636 s[0] = 0;
637 *len = 0;
638 return -3;
639 }
640 *len = socklist[i].sock;
641 socklist[i].flags &= ~SOCK_CONNECT;
642 debug1("net: eof!(read) socket %d", socklist[i].sock);
643 return -1;
644 }
645 s[x] = 0;
646 *len = x;
647 if (socklist[i].flags & SOCK_PROXYWAIT) {
648 debug2("net: socket: %d proxy errno: %d", socklist[i].sock, s[1]);
649 socklist[i].flags &= ~(SOCK_CONNECT | SOCK_PROXYWAIT);
650 switch (s[1]) {
651 case 90: /* success */
652 s[0] = 0;
653 *len = 0;
654 return i;
655 case 91: /* failed */
656 errno = ECONNREFUSED;
657 break;
658 case 92: /* no identd */
659 case 93: /* identd said wrong username */
660 errno = ENETUNREACH;
661 break;
662 /* a better error message would be "socks misconfigured" */
663 /* or "identd not working" but this is simplest */
664 }
665 *len = socklist[i].sock;
666 return -1;
667 }
668 return i;
669 }
670 }
671 } else if (x == -1)
672 return -2; /* socket error */
673 else {
674 s[0] = 0;
675 *len = 0;
676 }
677 return -3;
678 }
679
680 /* sockgets: buffer and read from sockets
681 *
682 * attempts to read from all registered sockets for up to one second. if
683 * after one second, no complete data has been received from any of the
684 * sockets, 's' will be empty, 'len' will be 0, and sockgets will return -3.
685 * if there is returnable data received from a socket, the data will be
686 * in 's' (null-terminated if non-binary), the length will be returned
687 * in len, and the socket number will be returned.
688 * normal sockets have their input buffered, and each call to sockgets
689 * will return one line terminated with a '\n'. binary sockets are not
690 * buffered and return whatever coems in as soon as it arrives.
691 * listening sockets will return an empty string when a connection comes in.
692 * connecting sockets will return an empty string on a successful connect,
693 * or EOF on a failed connect.
694 * if an EOF is detected from any of the sockets, that socket number will be
695 * put in len, and -1 will be returned.
696 * the maximum length of the string returned is 512 (including null)
697 */
698
699 int sockgets(char *s, int *len)
700 {
701 char xx[514], *p, *px;
702 int ret, i, data = 0;
703
704 Context;
705 for (i = 0; i < MAXSOCKS; i++) {
706 /* check for stored-up data waiting to be processed */
707 if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].inbuf != NULL)) {
708 /* look for \r too cos windows can't follow RFCs */
709 p = strchr(socklist[i].inbuf, '\n');
710 if (p == NULL)
711 p = strchr(socklist[i].inbuf, '\r');
712 if (p != NULL) {
713 *p = 0;
714 if (strlen(socklist[i].inbuf) > 510)
715 socklist[i].inbuf[510] = 0;
716 strcpy(s, socklist[i].inbuf);
717 px = (char *) nmalloc(strlen(p + 1) + 1);
718 strcpy(px, p + 1);
719 nfree(socklist[i].inbuf);
720 if (px[0])
721 socklist[i].inbuf = px;
722 else {
723 nfree(px);
724 socklist[i].inbuf = NULL;
725 }
726 /* strip CR if this was CR/LF combo */
727 if (s[strlen(s) - 1] == '\r')
728 s[strlen(s) - 1] = 0;
729 *len = strlen(s);
730 return socklist[i].sock;
731 }
732 }
733 /* also check any sockets that might have EOF'd during write */
734 if (!(socklist[i].flags & SOCK_UNUSED)
735 && (socklist[i].flags & SOCK_EOFD)) {
736 Context;
737 s[0] = 0;
738 *len = socklist[i].sock;
739 return -1;
740 }
741 }
742 /* no pent-up data of any worth -- down to business */
743 Context;
744 *len = 0;
745 ret = sockread(xx, len);
746 if (ret < 0) {
747 s[0] = 0;
748 return ret;
749 }
750 /* binary and listening sockets don't get buffered */
751 /* passed on sockets don't get buffered either (Fabian)*/
752 if (socklist[ret].flags & SOCK_CONNECT) {
753 if (socklist[ret].flags & SOCK_STRONGCONN) {
754 socklist[ret].flags &= ~SOCK_STRONGCONN;
755 /* buffer any data that came in, for future read */
756 socklist[ret].inbuf = (char *) nmalloc(strlen(xx) + 1);
757 strcpy(socklist[ret].inbuf, xx);
758 }
759 socklist[ret].flags &= ~SOCK_CONNECT;
760 s[0] = 0;
761 return socklist[ret].sock;
762 }
763 if (socklist[ret].flags & SOCK_BINARY) {
764 my_memcpy(s, xx, *len);
765 return socklist[ret].sock;
766 }
767 if ((socklist[ret].flags & SOCK_LISTEN) ||
768 (socklist[ret].flags & SOCK_PASS))
769 return socklist[ret].sock;
770 Context;
771 /* might be necessary to prepend stored-up data! */
772 if (socklist[ret].inbuf != NULL) {
773 p = socklist[ret].inbuf;
774 socklist[ret].inbuf = (char *) nmalloc(strlen(p) + strlen(xx) + 1);
775 strcpy(socklist[ret].inbuf, p);
776 strcat(socklist[ret].inbuf, xx);
777 nfree(p);
778 if (strlen(socklist[ret].inbuf) < 512) {
779 strcpy(xx, socklist[ret].inbuf);
780 nfree(socklist[ret].inbuf);
781 socklist[ret].inbuf = NULL;
782 } else {
783 p = socklist[ret].inbuf;
784 socklist[ret].inbuf = (char *) nmalloc(strlen(p) - 509);
785 strcpy(socklist[ret].inbuf, p + 510);
786 *(p + 510) = 0;
787 strcpy(xx, p);
788 nfree(p);
789 /* (leave the rest to be post-pended later) */
790 }
791 }
792 Context;
793 /* look for EOL marker; if it's there, i have something to show */
794 p = strchr(xx, '\n');
795 if (p == NULL)
796 p = strchr(xx, '\r');
797 if (p != NULL) {
798 *p = 0;
799 strcpy(s, xx);
800 strcpy(xx, p + 1);
801 if (s[strlen(s) - 1] == '\r')
802 s[strlen(s) - 1] = 0;
803 data = 1; /* DCC_CHAT may now need to process a
804 * blank line */
805 /* NO! */
806 /* if (!s[0]) strcpy(s," "); */
807 } else {
808 s[0] = 0;
809 if (strlen(xx) >= 510) {
810 /* string is too long, so just insert fake \n */
811 strcpy(s, xx);
812 xx[0] = 0;
813 data = 1;
814 }
815 }
816 Context;
817 *len = strlen(s);
818 /* anything left that needs to be saved? */
819 if (!xx[0]) {
820 if (data)
821 return socklist[ret].sock;
822 else
823 return -3;
824 }
825 Context;
826 /* prepend old data back */
827 if (socklist[ret].inbuf != NULL) {
828 Context;
829 p = socklist[ret].inbuf;
830 socklist[ret].inbuf = (char *) nmalloc(strlen(p) + strlen(xx) + 1);
831 strcpy(socklist[ret].inbuf, xx);
832 strcat(socklist[ret].inbuf, p);
833 nfree(p);
834 } else {
835 Context;
836 socklist[ret].inbuf = (char *) nmalloc(strlen(xx) + 1);
837 strcpy(socklist[ret].inbuf, xx);
838 }
839 Context;
840 if (data) {
841 Context;
842 return socklist[ret].sock;
843 } else {
844 Context;
845 return -3;
846 }
847 }
848
849 /* dump something to a socket */
850 /* DO NOT PUT CONTEXTS IN HERE IF YOU WANT DEBUG TO BE MEANINGFUL!!! */
851 void tputs(int z, char *s, unsigned int len)
852 {
853 int i, x, idx;
854 char *p;
855
856 if (z < 0)
857 return; /* um... HELLO?! sanity check please! */
858 if (((z == STDOUT) || (z == STDERR)) && (!backgrd || use_stderr)) {
859 write(z, s, len);
860 return;
861 }
862 for (i = 0; i < MAXSOCKS; i++) {
863 if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].sock == z)) {
864
865 for (idx = 0; idx < dcc_total; idx++) {
866 if (dcc[idx].sock == z) {
867 if (dcc[idx].type) {
868 if (dcc[idx].type->name) {
869 if (!strncmp(dcc[idx].type->name, "BOT", 3)) {
870 otraffic_bn_today += len;
871 break;
872 } else if (!strcmp(dcc[idx].type->name, "SERVER")) {
873 otraffic_irc_today += len;
874 break;
875 } else if (!strncmp(dcc[idx].type->name, "CHAT", 4)) {
876 otraffic_dcc_today += len;
877 break;
878 } else if (!strncmp(dcc[idx].type->name, "FILES", 5)) {
879 otraffic_filesys_today += len;
880 break;
881 } else if (!strcmp(dcc[idx].type->name, "SEND")) {
882 otraffic_trans_today += len;
883 break;
884 } else if (!strncmp(dcc[idx].type->name, "GET", 3)) {
885 otraffic_trans_today += len;
886 break;
887 } else {
888 otraffic_unknown_today += len;
889 break;
890 }
891 }
892 }
893 }
894 }
895
896 if (socklist[i].outbuf != NULL) {
897 /* already queueing: just add it */
898 p = (char *) nrealloc(socklist[i].outbuf, socklist[i].outbuflen + len);
899 my_memcpy(p + socklist[i].outbuflen, s, len);
900 socklist[i].outbuf = p;
901 socklist[i].outbuflen += len;
902 return;
903 }
904 /* try. */
905 x = write(z, s, len);
906 if (x == (-1))
907 x = 0;
908 if (x < len) {
909 /* socket is full, queue it */
910 socklist[i].outbuf = (char *) nmalloc(len - x);
911 my_memcpy(socklist[i].outbuf, &s[x], len - x);
912 socklist[i].outbuflen = len - x;
913 }
914 return;
915 }
916 }
917 putlog(LOG_MISC, "*", "!!! writing to nonexistent socket: %d", z);
918 s[strlen(s) - 1] = 0;
919 putlog(LOG_MISC, "*", "!-> '%s'", s);
920 }
921
922 /* tputs might queue data for sockets, let's dump as much of it as
923 * possible */
924 void dequeue_sockets()
925 {
926 int i, x;
927
928 for (i = 0; i < MAXSOCKS; i++) {
929 if (!(socklist[i].flags & SOCK_UNUSED) &&
930 (socklist[i].outbuf != NULL)) {
931 /* trick tputs into doing the work */
932 x = write(socklist[i].sock, socklist[i].outbuf,
933 socklist[i].outbuflen);
934 if ((x < 0) && (errno != EAGAIN)
935 #ifdef EBADSLT
936 && (errno != EBADSLT)
937 #endif
938 #ifdef ENOTCONN
939 && (errno != ENOTCONN)
940 #endif
941 ) {
942 /* this detects an EOF during writing */
943 debug3("net: eof!(write) socket %d (%s,%d)", socklist[i].sock,
944 strerror(errno), errno);
945 socklist[i].flags |= SOCK_EOFD;
946 } else if (x == socklist[i].outbuflen) {
947 /* if the whole buffer was sent, nuke it */
948 nfree(socklist[i].outbuf);
949 socklist[i].outbuf = NULL;
950 socklist[i].outbuflen = 0;
951 } else if (x > 0) {
952 char *p = socklist[i].outbuf;
953
954 /* this removes any sent bytes from the beginning of the buffer */
955 socklist[i].outbuf = (char *) nmalloc(socklist[i].outbuflen - x);
956 my_memcpy(socklist[i].outbuf, p + x, socklist[i].outbuflen - x);
957 socklist[i].outbuflen -= x;
958 nfree(p);
959 }
960 }
961 }
962 }
963
964 /* DEBUGGING STUFF */
965
966 void tell_netdebug(int idx)
967 {
968 int i;
969 char s[80];
970
971 dprintf(idx, "Open sockets:");
972 for (i = 0; i < MAXSOCKS; i++) {
973 if (!(socklist[i].flags & SOCK_UNUSED)) {
974 sprintf(s, " %d", socklist[i].sock);
975 if (socklist[i].flags & SOCK_BINARY)
976 strcat(s, " (binary)");
977 if (socklist[i].flags & SOCK_LISTEN)
978 strcat(s, " (listen)");
979 if (socklist[i].flags & SOCK_PASS)
980 strcat(s, " (passed on)");
981 if (socklist[i].flags & SOCK_CONNECT)
982 strcat(s, " (connecting)");
983 if (socklist[i].flags & SOCK_STRONGCONN)
984 strcat(s, " (strong)");
985 if (socklist[i].flags & SOCK_NONSOCK)
986 strcat(s, " (file)");
987 if (socklist[i].inbuf != NULL)
988 sprintf(&s[strlen(s)], " (inbuf: %04X)", strlen(socklist[i].inbuf));
989 if (socklist[i].outbuf != NULL)
990 sprintf(&s[strlen(s)], " (outbuf: %06lX)", socklist[i].outbuflen);
991 strcat(s, ",");
992 dprintf(idx, "%s", s);
993 }
994 }
995 dprintf(idx, " done.\n");
996 }
997
998 /* Security-flavoured sanity checking on DCC connections of all sorts can be
999 * done with this routine. Feed it the proper information from your DCC
1000 * before you attempt the connection, and this will make an attempt at
1001 * figuring out if the connection is really that person, or someone screwing
1002 * around. It's not foolproof, but anything that fails this check probably
1003 * isn't going to work anyway due to masquerading firewalls, NAT routers,
1004 * or bugs in mIRC. */
1005 int sanitycheck_dcc(char *nick, char *from, char *ipaddy, char *port)
1006 {
1007 /* According to the latest RFC, the clients SHOULD be able to handle
1008 * DNS names that are up to 255 characters long. This is not broken. */
1009 char badaddress[16];
1010 IP ip = my_atoul(ipaddy);
1011 int prt = atoi(port);
1012
1013 /* It is disabled HERE so we only have to check in *one* spot! */
1014 if (!dcc_sanitycheck)
1015 return 1;
1016 Context; /* This should be pretty solid, but
1017 * something _might_ break. */
1018 if (prt < 1) {
1019 putlog(LOG_MISC, "*", "ALERT: (%s!%s) specified an impossible port of %u!",
1020 nick, from, prt);
1021 return 0;
1022 }
1023 sprintf(badaddress, "%u.%u.%u.%u", (ip >> 24) & 0xff, (ip >> 16) & 0xff,
1024 (ip >> 8) & 0xff, ip & 0xff);
1025 if (ip < (1 << 24)) {
1026 putlog(LOG_MISC, "*", "ALERT: (%s!%s) specified an impossible IP of %s!",
1027 nick, from, badaddress);
1028 return 0;
1029 }
1030 return 1;
1031 }
1032
1033 int hostsanitycheck_dcc(char *nick, char *from, IP ip, char *dnsname,
1034 char *prt)
1035 {
1036 /* According to the latest RFC, the clients SHOULD be able to handle
1037 * DNS names that are up to 255 characters long. This is not broken. */
1038 char hostname[256], badaddress[16];
1039
1040 /* It is disabled HERE so we only have to check in *one* spot! */
1041 if (!dcc_sanitycheck)
1042 return 1;
1043 Context; /* This should be pretty solid, but
1044 * something _might_ break. */
1045 sprintf(badaddress, "%u.%u.%u.%u", (ip >> 24) & 0xff, (ip >> 16) & 0xff,
1046 (ip >> 8) & 0xff, ip & 0xff);
1047 /* These should pad like crazy with zeros, since 120 bytes or so is
1048 * where the routines providing our data currently lose interest. I'm
1049 * using the n-variant in case someone changes that... */
1050 strncpy(hostname, extracthostname(from), 255);
1051 hostname[255] = 0;
1052 if (!strcasecmp(hostname, dnsname)) {
1053 putlog(LOG_DEBUG, "*", "DNS information for submitted IP checks out.");
1054 return 1;
1055 }
1056 if (!strcmp(badaddress, dnsname))
1057 putlog(LOG_MISC, "*", "ALERT: (%s!%s) sent a DCC request with bogus IP information of %s port %u!",
1058 nick, from, badaddress, prt);
1059 else
1060 return 1; /* <- usually happens when we have
1061 a user with an unresolved hostmask! */
1062 return 0;
1063 }

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