/[cvs]/eggdrop1.9/src/net.c
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Revision 1.22 - (show annotations) (download) (as text)
Sat Sep 23 17:46:55 2000 UTC (18 years, 8 months ago) by fabian
Branch: MAIN
Changes since 1.21: +6 -5 lines
File MIME type: text/x-chdr
fabian: applied transfer_turbodcc_dos patch

1 /*
2 * net.c -- handles:
3 * all raw network i/o
4 *
5 * $Id: net.c,v 1.21 2000/09/09 11:39:09 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 /* Initialize the socklist
75 */
76 void init_net()
77 {
78 int i;
79
80 for (i = 0; i < MAXSOCKS; i++) {
81 socklist[i].flags = SOCK_UNUSED;
82 }
83 }
84
85 int expmem_net()
86 {
87 int i, tot = 0;
88
89 Context;
90 for (i = 0; i < MAXSOCKS; i++) {
91 if (!(socklist[i].flags & SOCK_UNUSED)) {
92 if (socklist[i].inbuf != NULL)
93 tot += strlen(socklist[i].inbuf) + 1;
94 if (socklist[i].outbuf != NULL)
95 tot += socklist[i].outbuflen;
96 }
97 }
98 return tot;
99 }
100
101 /* Get my ip number
102 */
103 IP getmyip()
104 {
105 struct hostent *hp;
106 char s[121];
107 IP ip;
108 struct in_addr *in;
109
110 /* Could be pre-defined */
111 if (myip[0]) {
112 if ((myip[strlen(myip) - 1] >= '0') && (myip[strlen(myip) - 1] <= '9'))
113 return (IP) inet_addr(myip);
114 }
115 /* Also could be pre-defined */
116 if (hostname[0])
117 hp = gethostbyname(hostname);
118 else {
119 gethostname(s, 120);
120 hp = gethostbyname(s);
121 }
122 if (hp == NULL)
123 fatal("Hostname self-lookup failed.", 0);
124 in = (struct in_addr *) (hp->h_addr_list[0]);
125 ip = (IP) (in->s_addr);
126 return ip;
127 }
128
129 void neterror(char *s)
130 {
131 switch (errno) {
132 case EADDRINUSE:
133 strcpy(s, "Address already in use");
134 break;
135 case EADDRNOTAVAIL:
136 strcpy(s, "Address invalid on remote machine");
137 break;
138 case EAFNOSUPPORT:
139 strcpy(s, "Address family not supported");
140 break;
141 case EALREADY:
142 strcpy(s, "Socket already in use");
143 break;
144 case EBADF:
145 strcpy(s, "Socket descriptor is bad");
146 break;
147 case ECONNREFUSED:
148 strcpy(s, "Connection refused");
149 break;
150 case EFAULT:
151 strcpy(s, "Namespace segment violation");
152 break;
153 case EINPROGRESS:
154 strcpy(s, "Operation in progress");
155 break;
156 case EINTR:
157 strcpy(s, "Timeout");
158 break;
159 case EINVAL:
160 strcpy(s, "Invalid namespace");
161 break;
162 case EISCONN:
163 strcpy(s, "Socket already connected");
164 break;
165 case ENETUNREACH:
166 strcpy(s, "Network unreachable");
167 break;
168 case ENOTSOCK:
169 strcpy(s, "File descriptor, not a socket");
170 break;
171 case ETIMEDOUT:
172 strcpy(s, "Connection timed out");
173 break;
174 case ENOTCONN:
175 strcpy(s, "Socket is not connected");
176 break;
177 case EHOSTUNREACH:
178 strcpy(s, "Host is unreachable");
179 break;
180 case EPIPE:
181 strcpy(s, "Broken pipe");
182 break;
183 #ifdef ECONNRESET
184 case ECONNRESET:
185 strcpy(s, "Connection reset by peer");
186 break;
187 #endif
188 #ifdef EACCES
189 case EACCES:
190 strcpy(s, "Permission denied");
191 break;
192 #endif
193 case 0:
194 strcpy(s, "Error 0");
195 break;
196 default:
197 sprintf(s, "Unforseen error %d", errno);
198 break;
199 }
200 }
201
202 /* Return a free entry in the socket entry
203 */
204 int allocsock(int sock, int options)
205 {
206 int i;
207
208 for (i = 0; i < MAXSOCKS; i++) {
209 if (socklist[i].flags & SOCK_UNUSED) {
210 /* yay! there is table space */
211 socklist[i].inbuf = socklist[i].outbuf = NULL;
212 socklist[i].outbuflen = 0;
213 socklist[i].flags = options;
214 socklist[i].sock = sock;
215 return i;
216 }
217 }
218 fatal("Socket table is full!", 0);
219 return -1; /* Never reached */
220 }
221
222 /* Request a normal socket for i/o
223 */
224 void setsock(int sock, int options)
225 {
226 int i = allocsock(sock, options);
227 int parm;
228
229 if (((sock != STDOUT) || backgrd) &&
230 !(socklist[i].flags & SOCK_NONSOCK)) {
231 parm = 1;
232 setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (void *) &parm, sizeof(int));
233
234 parm = 0;
235 setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *) &parm, sizeof(int));
236 }
237 if (options & SOCK_LISTEN) {
238 /* Tris says this lets us grab the same port again next time */
239 parm = 1;
240 setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *) &parm, sizeof(int));
241 }
242 /* Yay async i/o ! */
243 fcntl(sock, F_SETFL, O_NONBLOCK);
244 }
245
246 int getsock(int options)
247 {
248 int sock = socket(AF_INET, SOCK_STREAM, 0);
249
250 if (sock < 0)
251 fatal("Can't open a socket at all!", 0);
252 setsock(sock, options);
253 return sock;
254 }
255
256 /* Done with a socket
257 */
258 void killsock(int sock)
259 {
260 int i;
261
262 for (i = 0; i < MAXSOCKS; i++) {
263 if ((socklist[i].sock == sock) && !(socklist[i].flags & SOCK_UNUSED)) {
264 close(socklist[i].sock);
265 if (socklist[i].inbuf != NULL) {
266 nfree(socklist[i].inbuf);
267 socklist[i].inbuf = NULL;
268 }
269 if (socklist[i].outbuf != NULL) {
270 nfree(socklist[i].outbuf);
271 socklist[i].outbuf = NULL;
272 socklist[i].outbuflen = 0;
273 }
274 socklist[i].flags = SOCK_UNUSED;
275 return;
276 }
277 }
278 putlog(LOG_MISC, "*", "Attempt to kill un-allocated socket %d !!", sock);
279 }
280
281 /* Send connection request to proxy
282 */
283 static int proxy_connect(int sock, char *host, int port, int proxy)
284 {
285 unsigned char x[10];
286 struct hostent *hp;
287 char s[30];
288 int i;
289
290 /* socks proxy */
291 if (proxy == PROXY_SOCKS) {
292 /* numeric IP? */
293 if ((host[strlen(host) - 1] >= '0') && (host[strlen(host) - 1] <= '9')) {
294 IP ip = ((IP) inet_addr(host)); /* drummer */
295 egg_memcpy(x, &ip, 4); /* Beige@Efnet */
296 } else {
297 /* no, must be host.domain */
298 if (!setjmp(alarmret)) {
299 alarm(resolve_timeout);
300 hp = gethostbyname(host);
301 alarm(0);
302 } else {
303 hp = NULL;
304 }
305 if (hp == NULL) {
306 killsock(sock);
307 return -2;
308 }
309 egg_memcpy(x, hp->h_addr, hp->h_length);
310 }
311 for (i = 0; i < MAXSOCKS; i++) {
312 if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].sock == sock))
313 socklist[i].flags |= SOCK_PROXYWAIT; /* drummer */
314 }
315 sprintf(s, "\004\001%c%c%c%c%c%c%s", (port >> 8) % 256, (port % 256),
316 x[0], x[1], x[2], x[3], botuser);
317 tputs(sock, s, strlen(botuser) + 9); /* drummer */
318 } else if (proxy == PROXY_SUN) {
319 sprintf(s, "%s %d\n", host, port);
320 tputs(sock, s, strlen(s)); /* drummer */
321 }
322 return sock;
323 }
324
325 /* Starts a connection attempt to a socket
326 *
327 * If given a normal hostname, this will be resolved to the corresponding
328 * IP address first. PLEASE try to use the non-blocking dns functions
329 * instead and then call this function with the IP address to avoid blocking.
330 *
331 * returns <0 if connection refused:
332 * -1 neterror() type error
333 * -2 can't resolve hostname
334 */
335 int open_telnet_raw(int sock, char *server, int sport)
336 {
337 struct sockaddr_in name;
338 struct hostent *hp;
339 char host[121];
340 int i, port;
341 volatile int proxy;
342
343 /* firewall? use socks */
344 if (firewall[0]) {
345 if (firewall[0] == '!') {
346 proxy = PROXY_SUN;
347 strcpy(host, &firewall[1]);
348 } else {
349 proxy = PROXY_SOCKS;
350 strcpy(host, firewall);
351 }
352 port = firewallport;
353 } else {
354 proxy = 0;
355 strcpy(host, server);
356 port = sport;
357 }
358 /* patch by tris for multi-hosted machines: */
359 egg_bzero((char *) &name, sizeof(struct sockaddr_in));
360
361 name.sin_family = AF_INET;
362 name.sin_addr.s_addr = (myip[0] ? getmyip() : INADDR_ANY);
363 if (bind(sock, (struct sockaddr *) &name, sizeof(name)) < 0)
364 return -1;
365 egg_bzero((char *) &name, sizeof(struct sockaddr_in));
366
367 name.sin_family = AF_INET;
368 name.sin_port = htons(port);
369 /* Numeric IP? */
370 if ((host[strlen(host) - 1] >= '0') && (host[strlen(host) - 1] <= '9'))
371 name.sin_addr.s_addr = inet_addr(host);
372 else {
373 /* No, must be host.domain */
374 debug0("WARNING: open_telnet_raw() is about to block in gethostbyname()!");
375 if (!setjmp(alarmret)) {
376 alarm(resolve_timeout);
377 hp = gethostbyname(host);
378 alarm(0);
379 } else {
380 hp = NULL;
381 }
382 if (hp == NULL)
383 return -2;
384 egg_memcpy(&name.sin_addr, hp->h_addr, hp->h_length);
385 name.sin_family = hp->h_addrtype;
386 }
387 for (i = 0; i < MAXSOCKS; i++) {
388 if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].sock == sock))
389 socklist[i].flags = (socklist[i].flags & ~SOCK_VIRTUAL) | SOCK_CONNECT;
390 }
391 if (connect(sock, (struct sockaddr *) &name,
392 sizeof(struct sockaddr_in)) < 0) {
393 if (errno == EINPROGRESS) {
394 /* Firewall? announce connect attempt to proxy */
395 if (firewall[0])
396 return proxy_connect(sock, server, sport, proxy);
397 return sock; /* async success! */
398 } else
399 return -1;
400 }
401 /* Synchronous? :/ */
402 if (firewall[0])
403 return proxy_connect(sock, server, sport, proxy);
404 return sock;
405 }
406
407 /* Ordinary non-binary connection attempt */
408 int open_telnet(char *server, int port)
409 {
410 int sock = getsock(0),
411 ret = open_telnet_raw(sock, server, port);
412
413 if (ret < 0)
414 killsock(sock);
415 return ret;
416 }
417
418 /* Returns a socket number for a listening socket that will accept any
419 * connection on a certain address -- port # is returned in port
420 */
421 int open_address_listen(IP addr, int *port)
422 {
423 int sock;
424 unsigned int addrlen;
425 struct sockaddr_in name;
426
427 if (firewall[0]) {
428 /* FIXME: can't do listen port thru firewall yet */
429 putlog(LOG_MISC, "*", "!! Cant open a listen port (you are using a firewall)");
430 return -1;
431 }
432 sock = getsock(SOCK_LISTEN);
433 egg_bzero((char *) &name, sizeof(struct sockaddr_in));
434
435 name.sin_family = AF_INET;
436 name.sin_port = htons(*port); /* 0 = just assign us a port */
437 name.sin_addr.s_addr = addr;
438 if (bind(sock, (struct sockaddr *) &name, sizeof(name)) < 0) {
439 killsock(sock);
440 return -1;
441 }
442 /* what port are we on? */
443 addrlen = sizeof(name);
444 if (getsockname(sock, (struct sockaddr *) &name, &addrlen) < 0) {
445 killsock(sock);
446 return -1;
447 }
448 *port = ntohs(name.sin_port);
449 if (listen(sock, 1) < 0) {
450 killsock(sock);
451 return -1;
452 }
453 return sock;
454 }
455
456 /* Returns a socket number for a listening socket that will accept any
457 * connection -- port # is returned in port
458 */
459 inline int open_listen(int *port)
460 {
461 return open_address_listen(myip[0] ? getmyip() : INADDR_ANY, port);
462 }
463
464 /* Given a network-style IP address, returns the hostname. The hostname
465 * will be in the "##.##.##.##" format if there was an error.
466 *
467 * NOTE: This function is depreciated. Try using the async dns approach
468 * instead.
469 */
470 char *hostnamefromip(unsigned long ip)
471 {
472 struct hostent *hp;
473 unsigned long addr = ip;
474 unsigned char *p;
475 static char s[UHOSTLEN];
476
477 if (!setjmp(alarmret)) {
478 alarm(resolve_timeout);
479 hp = gethostbyaddr((char *) &addr, sizeof(addr), AF_INET);
480 alarm(0);
481 } else {
482 hp = NULL;
483 }
484 if (hp == NULL) {
485 p = (unsigned char *) &addr;
486 sprintf(s, "%u.%u.%u.%u", p[0], p[1], p[2], p[3]);
487 return s;
488 }
489 strncpy(s, hp->h_name, UHOSTLEN - 1);
490 s[UHOSTLEN - 1] = 0;
491 return s;
492 }
493
494 /* Returns the given network byte order IP address in the
495 * dotted format - "##.##.##.##"
496 */
497 char *iptostr(IP ip)
498 {
499 struct in_addr a;
500
501 a.s_addr = ip;
502 return inet_ntoa(a);
503 }
504
505 /* Short routine to answer a connect received on a socket made previously
506 * by open_listen ... returns hostname of the caller & the new socket
507 * does NOT dispose of old "public" socket!
508 */
509 int answer(int sock, char *caller, unsigned long *ip, unsigned short *port,
510 int binary)
511 {
512 int new_sock;
513 unsigned int addrlen;
514 struct sockaddr_in from;
515 addrlen = sizeof(struct sockaddr);
516
517 new_sock = accept(sock, (struct sockaddr *) &from, &addrlen);
518 if (new_sock < 0)
519 return -1;
520 if (ip != NULL) {
521 *ip = from.sin_addr.s_addr;
522 /* This is now done asynchronously. We now only provide the IP address.
523 *
524 * strncpy(caller, hostnamefromip(*ip), 120);
525 */
526 strncpy(caller, iptostr(*ip), 120);
527 caller[120] = 0;
528 *ip = ntohl(*ip);
529 }
530 if (port != NULL)
531 *port = ntohs(from.sin_port);
532 /* Set up all the normal socket crap */
533 setsock(new_sock, (binary ? SOCK_BINARY : 0));
534 return new_sock;
535 }
536
537 /* Like open_telnet, but uses server & port specifications of dcc
538 */
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 /* Attempts to read from all the sockets in socklist
567 * fills s with up to 511 bytes if available, and returns the array index
568 *
569 * on EOF: returns -1, with socket in len
570 * on socket error: returns -2
571 * if nothing is ready: returns -3
572 */
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
590 for (i = 0; i < MAXSOCKS; i++)
591 if (!(socklist[i].flags & (SOCK_UNUSED | SOCK_VIRTUAL))) {
592 if ((socklist[i].sock == STDOUT) && !backgrd)
593 FD_SET(STDIN, &fd);
594 else
595 FD_SET(socklist[i].sock, &fd);
596 }
597 #ifdef HPUX_HACKS
598 #ifndef HPUX10_HACKS
599 x = select(fds, (int *) &fd, (int *) NULL, (int *) NULL, &t);
600 #else
601 x = select(fds, &fd, NULL, NULL, &t);
602 #endif
603 #else
604 x = select(fds, &fd, NULL, NULL, &t);
605 #endif
606 if (x > 0) {
607 /* Something happened */
608 for (i = 0; i < MAXSOCKS; i++) {
609 if ((!(socklist[i].flags & SOCK_UNUSED)) &&
610 ((FD_ISSET(socklist[i].sock, &fd)) ||
611 ((socklist[i].sock == STDOUT) && (!backgrd) &&
612 (FD_ISSET(STDIN, &fd))))) {
613 if (socklist[i].flags & (SOCK_LISTEN | SOCK_CONNECT)) {
614 /* Listening socket -- don't read, just return activity */
615 /* Same for connection attempt */
616 /* (for strong connections, require a read to succeed first) */
617 if (socklist[i].flags & SOCK_PROXYWAIT) { /* drummer */
618 /* Hang around to get the return code from proxy */
619 grab = 10;
620 } else if (!(socklist[i].flags & SOCK_STRONGCONN)) {
621 debug1("net: connect! sock %d", socklist[i].sock);
622 s[0] = 0;
623 *len = 0;
624 return i;
625 }
626 } else if (socklist[i].flags & SOCK_PASS) {
627 s[0] = 0;
628 *len = 0;
629 return i;
630 }
631 if ((socklist[i].sock == STDOUT) && !backgrd)
632 x = read(STDIN, s, grab);
633 else
634 x = read(socklist[i].sock, s, grab);
635 if (x <= 0) { /* eof */
636 if (x == EAGAIN) {
637 s[0] = 0;
638 *len = 0;
639 return -3;
640 }
641 *len = socklist[i].sock;
642 socklist[i].flags &= ~SOCK_CONNECT;
643 debug1("net: eof!(read) socket %d", socklist[i].sock);
644 return -1;
645 }
646 s[x] = 0;
647 *len = x;
648 if (socklist[i].flags & SOCK_PROXYWAIT) {
649 debug2("net: socket: %d proxy errno: %d", socklist[i].sock, s[1]);
650 socklist[i].flags &= ~(SOCK_CONNECT | SOCK_PROXYWAIT);
651 switch (s[1]) {
652 case 90: /* Success */
653 s[0] = 0;
654 *len = 0;
655 return i;
656 case 91: /* Failed */
657 errno = ECONNREFUSED;
658 break;
659 case 92: /* No identd */
660 case 93: /* Identd said wrong username */
661 /* A better error message would be "socks misconfigured"
662 * or "identd not working" but this is simplest.
663 */
664 errno = ENETUNREACH;
665 break;
666 }
667 *len = socklist[i].sock;
668 return -1;
669 }
670 return i;
671 }
672 }
673 } else if (x == -1)
674 return -2; /* socket error */
675 else {
676 s[0] = 0;
677 *len = 0;
678 }
679 return -3;
680 }
681
682 /* sockgets: buffer and read from sockets
683 *
684 * Attempts to read from all registered sockets for up to one second. if
685 * after one second, no complete data has been received from any of the
686 * sockets, 's' will be empty, 'len' will be 0, and sockgets will return -3.
687 * if there is returnable data received from a socket, the data will be
688 * in 's' (null-terminated if non-binary), the length will be returned
689 * in len, and the socket number will be returned.
690 * normal sockets have their input buffered, and each call to sockgets
691 * will return one line terminated with a '\n'. binary sockets are not
692 * buffered and return whatever coems in as soon as it arrives.
693 * listening sockets will return an empty string when a connection comes in.
694 * connecting sockets will return an empty string on a successful connect,
695 * or EOF on a failed connect.
696 * if an EOF is detected from any of the sockets, that socket number will be
697 * put in len, and -1 will be returned.
698 * the maximum length of the string returned is 512 (including null)
699 */
700
701 int sockgets(char *s, int *len)
702 {
703 char xx[514], *p, *px;
704 int ret, i, data = 0;
705
706 Context;
707 for (i = 0; i < MAXSOCKS; i++) {
708 /* Check for stored-up data waiting to be processed */
709 if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].inbuf != NULL)) {
710 /* look for \r too cos windows can't follow RFCs */
711 p = strchr(socklist[i].inbuf, '\n');
712 if (p == NULL)
713 p = strchr(socklist[i].inbuf, '\r');
714 if (p != NULL) {
715 *p = 0;
716 if (strlen(socklist[i].inbuf) > 510)
717 socklist[i].inbuf[510] = 0;
718 strcpy(s, socklist[i].inbuf);
719 px = (char *) nmalloc(strlen(p + 1) + 1);
720 strcpy(px, p + 1);
721 nfree(socklist[i].inbuf);
722 if (px[0])
723 socklist[i].inbuf = px;
724 else {
725 nfree(px);
726 socklist[i].inbuf = NULL;
727 }
728 /* Strip CR if this was CR/LF combo */
729 if (s[strlen(s) - 1] == '\r')
730 s[strlen(s) - 1] = 0;
731 *len = strlen(s);
732 return socklist[i].sock;
733 }
734 }
735 /* Also check any sockets that might have EOF'd during write */
736 if (!(socklist[i].flags & SOCK_UNUSED)
737 && (socklist[i].flags & SOCK_EOFD)) {
738 Context;
739 s[0] = 0;
740 *len = socklist[i].sock;
741 return -1;
742 }
743 }
744 /* No pent-up data of any worth -- down to business */
745 Context;
746 *len = 0;
747 ret = sockread(xx, len);
748 if (ret < 0) {
749 s[0] = 0;
750 return ret;
751 }
752 /* Binary, listening and passed on sockets don't get buffered. */
753 if (socklist[ret].flags & SOCK_CONNECT) {
754 if (socklist[ret].flags & SOCK_STRONGCONN) {
755 socklist[ret].flags &= ~SOCK_STRONGCONN;
756 /* Buffer any data that came in, for future read */
757 socklist[ret].inbuf = (char *) nmalloc(strlen(xx) + 1);
758 strcpy(socklist[ret].inbuf, xx);
759 }
760 socklist[ret].flags &= ~SOCK_CONNECT;
761 s[0] = 0;
762 return socklist[ret].sock;
763 }
764 if (socklist[ret].flags & SOCK_BINARY) {
765 egg_memcpy(s, xx, *len);
766 return socklist[ret].sock;
767 }
768 if ((socklist[ret].flags & SOCK_LISTEN) ||
769 (socklist[ret].flags & SOCK_PASS))
770 return socklist[ret].sock;
771 Context;
772 /* Might be necessary to prepend stored-up data! */
773 if (socklist[ret].inbuf != NULL) {
774 p = socklist[ret].inbuf;
775 socklist[ret].inbuf = (char *) nmalloc(strlen(p) + strlen(xx) + 1);
776 strcpy(socklist[ret].inbuf, p);
777 strcat(socklist[ret].inbuf, xx);
778 nfree(p);
779 if (strlen(socklist[ret].inbuf) < 512) {
780 strcpy(xx, socklist[ret].inbuf);
781 nfree(socklist[ret].inbuf);
782 socklist[ret].inbuf = NULL;
783 } else {
784 p = socklist[ret].inbuf;
785 socklist[ret].inbuf = (char *) nmalloc(strlen(p) - 509);
786 strcpy(socklist[ret].inbuf, p + 510);
787 *(p + 510) = 0;
788 strcpy(xx, p);
789 nfree(p);
790 /* (leave the rest to be post-pended later) */
791 }
792 }
793 Context;
794 /* Look for EOL marker; if it's there, i have something to show */
795 p = strchr(xx, '\n');
796 if (p == NULL)
797 p = strchr(xx, '\r');
798 if (p != NULL) {
799 *p = 0;
800 strcpy(s, xx);
801 strcpy(xx, p + 1);
802 if (s[strlen(s) - 1] == '\r')
803 s[strlen(s) - 1] = 0;
804 data = 1; /* DCC_CHAT may now need to process a
805 blank line */
806 /* NO! */
807 /* if (!s[0]) strcpy(s," "); */
808 } else {
809 s[0] = 0;
810 if (strlen(xx) >= 510) {
811 /* String is too long, so just insert fake \n */
812 strcpy(s, xx);
813 xx[0] = 0;
814 data = 1;
815 }
816 }
817 Context;
818 *len = strlen(s);
819 /* Anything left that needs to be saved? */
820 if (!xx[0]) {
821 if (data)
822 return socklist[ret].sock;
823 else
824 return -3;
825 }
826 Context;
827 /* Prepend old data back */
828 if (socklist[ret].inbuf != NULL) {
829 Context;
830 p = socklist[ret].inbuf;
831 socklist[ret].inbuf = (char *) nmalloc(strlen(p) + strlen(xx) + 1);
832 strcpy(socklist[ret].inbuf, xx);
833 strcat(socklist[ret].inbuf, p);
834 nfree(p);
835 } else {
836 Context;
837 socklist[ret].inbuf = (char *) nmalloc(strlen(xx) + 1);
838 strcpy(socklist[ret].inbuf, xx);
839 }
840 Context;
841 if (data) {
842 Context;
843 return socklist[ret].sock;
844 } else {
845 Context;
846 return -3;
847 }
848 }
849
850 /* Dump something to a socket
851 *
852 * NOTE: Do NOT put Contexts in here if you want DEBUG to be meaningful!!
853 */
854 void tputs(register int z, char *s, unsigned int len)
855 {
856 register int i, x, idx;
857 char *p;
858 static int inhere = 0;
859
860 if (z < 0)
861 return; /* um... HELLO?! sanity check please! */
862 if (((z == STDOUT) || (z == STDERR)) && (!backgrd || use_stderr)) {
863 write(z, s, len);
864 return;
865 }
866 for (i = 0; i < MAXSOCKS; i++) {
867 if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].sock == z)) {
868 for (idx = 0; idx < dcc_total; idx++) {
869 if (dcc[idx].sock == z) {
870 if (dcc[idx].type) {
871 if (dcc[idx].type->name) {
872 if (!strncmp(dcc[idx].type->name, "BOT", 3)) {
873 otraffic_bn_today += len;
874 break;
875 } else if (!strcmp(dcc[idx].type->name, "SERVER")) {
876 otraffic_irc_today += len;
877 break;
878 } else if (!strncmp(dcc[idx].type->name, "CHAT", 4)) {
879 otraffic_dcc_today += len;
880 break;
881 } else if (!strncmp(dcc[idx].type->name, "FILES", 5)) {
882 otraffic_filesys_today += len;
883 break;
884 } else if (!strcmp(dcc[idx].type->name, "SEND")) {
885 otraffic_trans_today += len;
886 break;
887 } else if (!strncmp(dcc[idx].type->name, "GET", 3)) {
888 otraffic_trans_today += len;
889 break;
890 } else {
891 otraffic_unknown_today += len;
892 break;
893 }
894 }
895 }
896 }
897 }
898
899 if (socklist[i].outbuf != NULL) {
900 /* Already queueing: just add it */
901 p = (char *) nrealloc(socklist[i].outbuf, socklist[i].outbuflen + len);
902 egg_memcpy(p + socklist[i].outbuflen, s, len);
903 socklist[i].outbuf = p;
904 socklist[i].outbuflen += len;
905 return;
906 }
907 /* Try. */
908 x = write(z, s, len);
909 if (x == (-1))
910 x = 0;
911 if (x < len) {
912 /* Socket is full, queue it */
913 socklist[i].outbuf = (char *) nmalloc(len - x);
914 egg_memcpy(socklist[i].outbuf, &s[x], len - x);
915 socklist[i].outbuflen = len - x;
916 }
917 return;
918 }
919 }
920 /* Make sure we don't cause a crash by looping here */
921 if (!inhere) {
922 inhere = 1;
923
924 putlog(LOG_MISC, "*", "!!! writing to nonexistent socket: %d", z);
925 s[strlen(s) - 1] = 0;
926 putlog(LOG_MISC, "*", "!-> '%s'", s);
927
928 inhere = 0;
929 }
930 }
931
932 /* tputs might queue data for sockets, let's dump as much of it as
933 * possible.
934 */
935 void dequeue_sockets()
936 {
937 int i, x;
938
939 for (i = 0; i < MAXSOCKS; i++) {
940 if (!(socklist[i].flags & SOCK_UNUSED) &&
941 socklist[i].outbuf != NULL) {
942 /* Trick tputs into doing the work */
943 x = write(socklist[i].sock, socklist[i].outbuf,
944 socklist[i].outbuflen);
945 if ((x < 0) && (errno != EAGAIN)
946 #ifdef EBADSLT
947 && (errno != EBADSLT)
948 #endif
949 #ifdef ENOTCONN
950 && (errno != ENOTCONN)
951 #endif
952 ) {
953 /* This detects an EOF during writing */
954 debug3("net: eof!(write) socket %d (%s,%d)", socklist[i].sock,
955 strerror(errno), errno);
956 socklist[i].flags |= SOCK_EOFD;
957 } else if (x == socklist[i].outbuflen) {
958 /* If the whole buffer was sent, nuke it */
959 nfree(socklist[i].outbuf);
960 socklist[i].outbuf = NULL;
961 socklist[i].outbuflen = 0;
962 } else if (x > 0) {
963 char *p = socklist[i].outbuf;
964
965 /* This removes any sent bytes from the beginning of the buffer */
966 socklist[i].outbuf = (char *) nmalloc(socklist[i].outbuflen - x);
967 egg_memcpy(socklist[i].outbuf, p + x, socklist[i].outbuflen - x);
968 socklist[i].outbuflen -= x;
969 nfree(p);
970 }
971
972 /* All queued data was sent. Call handler if one exists and the
973 * dcc entry wants it.
974 */
975 if (!socklist[i].outbuf) {
976 int idx = findanyidx(socklist[i].sock);
977
978 if (idx > 0 && dcc[idx].type && dcc[idx].type->outdone)
979 dcc[idx].type->outdone(idx);
980 }
981 }
982 }
983 }
984
985
986 /*
987 * Debugging stuff
988 */
989
990 void tell_netdebug(int idx)
991 {
992 int i;
993 char s[80];
994
995 dprintf(idx, "Open sockets:");
996 for (i = 0; i < MAXSOCKS; i++) {
997 if (!(socklist[i].flags & SOCK_UNUSED)) {
998 sprintf(s, " %d", socklist[i].sock);
999 if (socklist[i].flags & SOCK_BINARY)
1000 strcat(s, " (binary)");
1001 if (socklist[i].flags & SOCK_LISTEN)
1002 strcat(s, " (listen)");
1003 if (socklist[i].flags & SOCK_PASS)
1004 strcat(s, " (passed on)");
1005 if (socklist[i].flags & SOCK_CONNECT)
1006 strcat(s, " (connecting)");
1007 if (socklist[i].flags & SOCK_STRONGCONN)
1008 strcat(s, " (strong)");
1009 if (socklist[i].flags & SOCK_NONSOCK)
1010 strcat(s, " (file)");
1011 if (socklist[i].inbuf != NULL)
1012 sprintf(&s[strlen(s)], " (inbuf: %04X)", strlen(socklist[i].inbuf));
1013 if (socklist[i].outbuf != NULL)
1014 sprintf(&s[strlen(s)], " (outbuf: %06lX)", socklist[i].outbuflen);
1015 strcat(s, ",");
1016 dprintf(idx, "%s", s);
1017 }
1018 }
1019 dprintf(idx, " done.\n");
1020 }
1021
1022 /* Security-flavoured sanity checking on DCC connections of all sorts can be
1023 * done with this routine. Feed it the proper information from your DCC
1024 * before you attempt the connection, and this will make an attempt at
1025 * figuring out if the connection is really that person, or someone screwing
1026 * around. It's not foolproof, but anything that fails this check probably
1027 * isn't going to work anyway due to masquerading firewalls, NAT routers,
1028 * or bugs in mIRC.
1029 */
1030 int sanitycheck_dcc(char *nick, char *from, char *ipaddy, char *port)
1031 {
1032 /* According to the latest RFC, the clients SHOULD be able to handle
1033 * DNS names that are up to 255 characters long. This is not broken.
1034 */
1035 char badaddress[16];
1036 IP ip = my_atoul(ipaddy);
1037 int prt = atoi(port);
1038
1039 /* It is disabled HERE so we only have to check in *one* spot! */
1040 if (!dcc_sanitycheck)
1041 return 1;
1042 Context; /* This should be pretty solid, but
1043 something _might_ break. */
1044 if (prt < 1) {
1045 putlog(LOG_MISC, "*", "ALERT: (%s!%s) specified an impossible port of %u!",
1046 nick, from, prt);
1047 return 0;
1048 }
1049 sprintf(badaddress, "%u.%u.%u.%u", (ip >> 24) & 0xff, (ip >> 16) & 0xff,
1050 (ip >> 8) & 0xff, ip & 0xff);
1051 if (ip < (1 << 24)) {
1052 putlog(LOG_MISC, "*", "ALERT: (%s!%s) specified an impossible IP of %s!",
1053 nick, from, badaddress);
1054 return 0;
1055 }
1056 return 1;
1057 }
1058
1059 int hostsanitycheck_dcc(char *nick, char *from, IP ip, char *dnsname,
1060 char *prt)
1061 {
1062 /* According to the latest RFC, the clients SHOULD be able to handle
1063 * DNS names that are up to 255 characters long. This is not broken.
1064 */
1065 char hostname[256], badaddress[16];
1066
1067 /* It is disabled HERE so we only have to check in *one* spot! */
1068 if (!dcc_sanitycheck)
1069 return 1;
1070 Context; /* This should be pretty solid, but
1071 something _might_ break. */
1072 sprintf(badaddress, "%u.%u.%u.%u", (ip >> 24) & 0xff, (ip >> 16) & 0xff,
1073 (ip >> 8) & 0xff, ip & 0xff);
1074 /* These should pad like crazy with zeros, since 120 bytes or so is
1075 * where the routines providing our data currently lose interest. I'm
1076 * using the n-variant in case someone changes that...
1077 */
1078 strncpy(hostname, extracthostname(from), 255);
1079 hostname[255] = 0;
1080 if (!egg_strcasecmp(hostname, dnsname)) {
1081 putlog(LOG_DEBUG, "*", "DNS information for submitted IP checks out.");
1082 return 1;
1083 }
1084 if (!strcmp(badaddress, dnsname))
1085 putlog(LOG_MISC, "*", "ALERT: (%s!%s) sent a DCC request with bogus IP information of %s port %u!",
1086 nick, from, badaddress, prt);
1087 else
1088 return 1; /* <- usually happens when we have
1089 a user with an unresolved hostmask! */
1090 return 0;
1091 }
1092
1093 /* Checks wether the referenced socket has data queued.
1094 *
1095 * Returns true if the incoming/outgoing (depending on 'type') queues
1096 * contain data, otherwise false.
1097 */
1098 int sock_has_data(int type, int sock)
1099 {
1100 int ret = 0, i;
1101
1102 for (i = 0; i < MAXSOCKS; i++)
1103 if (!(socklist[i].flags & SOCK_UNUSED) && socklist[i].sock == sock)
1104 break;
1105 if (i < MAXSOCKS) {
1106 switch (type) {
1107 case SOCK_DATA_OUTGOING:
1108 ret = (socklist[i].outbuf != NULL);
1109 break;
1110 case SOCK_DATA_INCOMING:
1111 ret = (socklist[i].inbuf != NULL);
1112 break;
1113 }
1114 } else
1115 debug1("sock_has_data: could not find socket #%d, returning false.", sock);
1116 return ret;
1117 }

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