/[cvs]/eggdrop1.9/src/net.c
ViewVC logotype

Contents of /eggdrop1.9/src/net.c

Parent Directory Parent Directory | Revision Log Revision Log | View Revision Graph Revision Graph


Revision 1.18 - (show annotations) (download) (as text)
Thu Mar 23 23:17:55 2000 UTC (19 years, 6 months ago) by fabian
Branch: MAIN
CVS Tags: eggdrop10503, eggdrop10403
Changes since 1.17: +12 -34 lines
File MIME type: text/x-chdr
conf_make_fix6 patch

1 /*
2 * net.c -- handles:
3 * all raw network i/o
4 *
5 * $Id: net.c,v 1.17 2000/03/06 19:10:12 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 Context;
209 for (i = 0; i < MAXSOCKS; i++) {
210 if (socklist[i].flags & SOCK_UNUSED) {
211 /* yay! there is table space */
212 socklist[i].inbuf = socklist[i].outbuf = NULL;
213 socklist[i].outbuflen = 0;
214 socklist[i].flags = options;
215 socklist[i].sock = sock;
216 return i;
217 }
218 }
219 fatal("Socket table is full!", 0);
220 return -1; /* Never reached */
221 }
222
223 /* Request a normal socket for i/o
224 */
225 void setsock(int sock, int options)
226 {
227 int i = allocsock(sock, options);
228 int parm;
229
230 if (((sock != STDOUT) || backgrd) &&
231 !(socklist[i].flags & SOCK_NONSOCK)) {
232 parm = 1;
233 setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (void *) &parm, sizeof(int));
234
235 parm = 0;
236 setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *) &parm, sizeof(int));
237 }
238 if (options & SOCK_LISTEN) {
239 /* Tris says this lets us grab the same port again next time */
240 parm = 1;
241 setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *) &parm, sizeof(int));
242 }
243 /* Yay async i/o ! */
244 fcntl(sock, F_SETFL, O_NONBLOCK);
245 }
246
247 int getsock(int options)
248 {
249 int sock = socket(AF_INET, SOCK_STREAM, 0);
250
251 if (sock < 0)
252 fatal("Can't open a socket at all!", 0);
253 setsock(sock, options);
254 return sock;
255 }
256
257 /* Done with a socket
258 */
259 void killsock(int sock)
260 {
261 int i;
262
263 for (i = 0; i < MAXSOCKS; i++) {
264 if ((socklist[i].sock == sock) && !(socklist[i].flags & SOCK_UNUSED)) {
265 close(socklist[i].sock);
266 if (socklist[i].inbuf != NULL) {
267 nfree(socklist[i].inbuf);
268 socklist[i].inbuf = NULL;
269 }
270 if (socklist[i].outbuf != NULL) {
271 nfree(socklist[i].outbuf);
272 socklist[i].outbuf = NULL;
273 socklist[i].outbuflen = 0;
274 }
275 socklist[i].flags = SOCK_UNUSED;
276 return;
277 }
278 }
279 putlog(LOG_MISC, "*", "Attempt to kill un-allocated socket %d !!", sock);
280 }
281
282 /* Send connection request to proxy
283 */
284 static int proxy_connect(int sock, char *host, int port, int proxy)
285 {
286 unsigned char x[10];
287 struct hostent *hp;
288 char s[30];
289 int i;
290
291 /* socks proxy */
292 if (proxy == PROXY_SOCKS) {
293 /* numeric IP? */
294 if ((host[strlen(host) - 1] >= '0') && (host[strlen(host) - 1] <= '9')) {
295 IP ip = ((IP) inet_addr(host)); /* drummer */
296 egg_memcpy(x, &ip, 4); /* Beige@Efnet */
297 } else {
298 /* no, must be host.domain */
299 if (!setjmp(alarmret)) {
300 alarm(resolve_timeout);
301 hp = gethostbyname(host);
302 alarm(0);
303 } else {
304 hp = NULL;
305 }
306 if (hp == NULL) {
307 killsock(sock);
308 return -2;
309 }
310 egg_memcpy(x, hp->h_addr, hp->h_length);
311 }
312 for (i = 0; i < MAXSOCKS; i++) {
313 if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].sock == sock))
314 socklist[i].flags |= SOCK_PROXYWAIT; /* drummer */
315 }
316 sprintf(s, "\004\001%c%c%c%c%c%c%s", (port >> 8) % 256, (port % 256),
317 x[0], x[1], x[2], x[3], botuser);
318 tputs(sock, s, strlen(botuser) + 9); /* drummer */
319 } else if (proxy == PROXY_SUN) {
320 sprintf(s, "%s %d\n", host, port);
321 tputs(sock, s, strlen(s)); /* drummer */
322 }
323 return sock;
324 }
325
326 /* Starts a connection attempt to a socket
327 *
328 * If given a normal hostname, this will be resolved to the corresponding
329 * IP address first. PLEASE try to use the non-blocking dns functions
330 * instead and then call this function with the IP address to avoid blocking.
331 *
332 * returns <0 if connection refused:
333 * -1 neterror() type error
334 * -2 can't resolve hostname
335 */
336 int open_telnet_raw(int sock, char *server, int sport)
337 {
338 struct sockaddr_in name;
339 struct hostent *hp;
340 char host[121];
341 int i, port;
342 volatile int proxy;
343
344 /* firewall? use socks */
345 if (firewall[0]) {
346 if (firewall[0] == '!') {
347 proxy = PROXY_SUN;
348 strcpy(host, &firewall[1]);
349 } else {
350 proxy = PROXY_SOCKS;
351 strcpy(host, firewall);
352 }
353 port = firewallport;
354 } else {
355 proxy = 0;
356 strcpy(host, server);
357 port = sport;
358 }
359 /* patch by tris for multi-hosted machines: */
360 egg_bzero((char *) &name, sizeof(struct sockaddr_in));
361
362 name.sin_family = AF_INET;
363 name.sin_addr.s_addr = (myip[0] ? getmyip() : INADDR_ANY);
364 if (bind(sock, (struct sockaddr *) &name, sizeof(name)) < 0)
365 return -1;
366 egg_bzero((char *) &name, sizeof(struct sockaddr_in));
367
368 name.sin_family = AF_INET;
369 name.sin_port = my_htons(port);
370 /* Numeric IP? */
371 if ((host[strlen(host) - 1] >= '0') && (host[strlen(host) - 1] <= '9'))
372 name.sin_addr.s_addr = inet_addr(host);
373 else {
374 /* No, must be host.domain */
375 debug0("WARNING: open_telnet_raw() is about to block in gethostbyname()!");
376 if (!setjmp(alarmret)) {
377 alarm(resolve_timeout);
378 hp = gethostbyname(host);
379 alarm(0);
380 } else {
381 hp = NULL;
382 }
383 if (hp == NULL)
384 return -2;
385 egg_memcpy(&name.sin_addr, hp->h_addr, hp->h_length);
386 name.sin_family = hp->h_addrtype;
387 }
388 for (i = 0; i < MAXSOCKS; i++) {
389 if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].sock == sock))
390 socklist[i].flags = (socklist[i].flags & ~SOCK_VIRTUAL) | SOCK_CONNECT;
391 }
392 if (connect(sock, (struct sockaddr *) &name,
393 sizeof(struct sockaddr_in)) < 0) {
394 if (errno == EINPROGRESS) {
395 /* Firewall? announce connect attempt to proxy */
396 if (firewall[0])
397 return proxy_connect(sock, server, sport, proxy);
398 return sock; /* async success! */
399 } else
400 return -1;
401 }
402 /* Synchronous? :/ */
403 if (firewall[0])
404 return proxy_connect(sock, server, sport, proxy);
405 return sock;
406 }
407
408 /* Ordinary non-binary connection attempt */
409 int open_telnet(char *server, int port)
410 {
411 int sock = getsock(0),
412 ret = open_telnet_raw(sock, server, port);
413
414 if (ret < 0)
415 killsock(sock);
416 return ret;
417 }
418
419 /* Returns a socket number for a listening socket that will accept any
420 * connection -- port # is returned in port
421 */
422 int open_listen(int *port)
423 {
424 int sock;
425 unsigned int addrlen;
426 struct sockaddr_in name;
427
428 if (firewall[0]) {
429 /* FIXME: can't do listen port thru firewall yet */
430 putlog(LOG_MISC, "*", "!! Cant open a listen port (you are using a firewall)");
431 return -1;
432 }
433 sock = getsock(SOCK_LISTEN);
434 egg_bzero((char *) &name, sizeof(struct sockaddr_in));
435
436 name.sin_family = AF_INET;
437 name.sin_port = my_htons(*port); /* 0 = just assign us a port */
438 name.sin_addr.s_addr = (myip[0] ? getmyip() : INADDR_ANY);
439 if (bind(sock, (struct sockaddr *) &name, sizeof(name)) < 0) {
440 killsock(sock);
441 return -1;
442 }
443 /* what port are we on? */
444 addrlen = sizeof(name);
445 if (getsockname(sock, (struct sockaddr *) &name, &addrlen) < 0) {
446 killsock(sock);
447 return -1;
448 }
449 *port = my_ntohs(name.sin_port);
450 if (listen(sock, 1) < 0) {
451 killsock(sock);
452 return -1;
453 }
454 return sock;
455 }
456
457 /* Given a network-style IP address, returns the hostname. The hostname
458 * will be in the "##.##.##.##" format if there was an error.
459 *
460 * NOTE: This function is depreciated. Try using the async dns approach
461 * instead.
462 */
463 char *hostnamefromip(unsigned long ip)
464 {
465 struct hostent *hp;
466 unsigned long addr = ip;
467 unsigned char *p;
468 static char s[UHOSTLEN];
469
470 if (!setjmp(alarmret)) {
471 alarm(resolve_timeout);
472 hp = gethostbyaddr((char *) &addr, sizeof(addr), AF_INET);
473 alarm(0);
474 } else {
475 hp = NULL;
476 }
477 if (hp == NULL) {
478 p = (unsigned char *) &addr;
479 sprintf(s, "%u.%u.%u.%u", p[0], p[1], p[2], p[3]);
480 return s;
481 }
482 strncpy(s, hp->h_name, UHOSTLEN - 1);
483 s[UHOSTLEN - 1] = 0;
484 return s;
485 }
486
487 /* Returns the given network byte order IP address in the
488 * dotted format - "##.##.##.##"
489 */
490 char *iptostr(IP ip)
491 {
492 struct in_addr a;
493
494 a.s_addr = ip;
495 return inet_ntoa(a);
496 }
497
498 /* Short routine to answer a connect received on a socket made previously
499 * by open_listen ... returns hostname of the caller & the new socket
500 * does NOT dispose of old "public" socket!
501 */
502 int answer(int sock, char *caller, unsigned long *ip, unsigned short *port,
503 int binary)
504 {
505 int new_sock;
506 unsigned int addrlen;
507 struct sockaddr_in from;
508 addrlen = sizeof(struct sockaddr);
509
510 new_sock = accept(sock, (struct sockaddr *) &from, &addrlen);
511 if (new_sock < 0)
512 return -1;
513 if (ip != NULL) {
514 *ip = from.sin_addr.s_addr;
515 /* This is now done asynchronously. We now only provide the IP address.
516 *
517 * strncpy(caller, hostnamefromip(*ip), 120);
518 */
519 strncpy(caller, iptostr(*ip), 120);
520 caller[120] = 0;
521 *ip = my_ntohl(*ip);
522 }
523 if (port != NULL)
524 *port = my_ntohs(from.sin_port);
525 /* Set up all the normal socket crap */
526 setsock(new_sock, (binary ? SOCK_BINARY : 0));
527 return new_sock;
528 }
529
530 /* Like open_telnet, but uses server & port specifications of dcc
531 */
532 int open_telnet_dcc(int sock, char *server, char *port)
533 {
534 int p;
535 unsigned long addr;
536 char sv[121];
537 unsigned char c[4];
538
539 if (port != NULL)
540 p = atoi(port);
541 else
542 p = 2000;
543 if (server != NULL)
544 addr = my_atoul(server);
545 else
546 addr = 0L;
547 if (addr < (1 << 24))
548 return -3; /* fake address */
549 c[0] = (addr >> 24) & 0xff;
550 c[1] = (addr >> 16) & 0xff;
551 c[2] = (addr >> 8) & 0xff;
552 c[3] = addr & 0xff;
553 sprintf(sv, "%u.%u.%u.%u", c[0], c[1], c[2], c[3]);
554 /* strcpy(sv,hostnamefromip(addr)); */
555 p = open_telnet_raw(sock, sv, p);
556 return p;
557 }
558
559 /* Attempts to read from all the sockets in socklist
560 * fills s with up to 511 bytes if available, and returns the array index
561 *
562 * on EOF: returns -1, with socket in len
563 * on socket error: returns -2
564 * if nothing is ready: returns -3
565 */
566 static int sockread(char *s, int *len)
567 {
568 fd_set fd;
569 int fds, i, x;
570 struct timeval t;
571 int grab = 511;
572
573 fds = getdtablesize();
574 #ifdef FD_SETSIZE
575 if (fds > FD_SETSIZE)
576 fds = FD_SETSIZE; /* Fixes YET ANOTHER freebsd bug!!! */
577 #endif
578 /* timeout: 1 sec */
579 t.tv_sec = 1;
580 t.tv_usec = 0;
581 FD_ZERO(&fd);
582
583 for (i = 0; i < MAXSOCKS; i++)
584 if (!(socklist[i].flags & (SOCK_UNUSED | SOCK_VIRTUAL))) {
585 if ((socklist[i].sock == STDOUT) && !backgrd)
586 FD_SET(STDIN, &fd);
587 else
588 FD_SET(socklist[i].sock, &fd);
589 }
590 #ifdef HPUX_HACKS
591 #ifndef HPUX10_HACKS
592 x = select(fds, (int *) &fd, (int *) NULL, (int *) NULL, &t);
593 #else
594 x = select(fds, &fd, NULL, NULL, &t);
595 #endif
596 #else
597 x = select(fds, &fd, NULL, NULL, &t);
598 #endif
599 if (x > 0) {
600 /* Something happened */
601 for (i = 0; i < MAXSOCKS; i++) {
602 if ((!(socklist[i].flags & SOCK_UNUSED)) &&
603 ((FD_ISSET(socklist[i].sock, &fd)) ||
604 ((socklist[i].sock == STDOUT) && (!backgrd) &&
605 (FD_ISSET(STDIN, &fd))))) {
606 if (socklist[i].flags & (SOCK_LISTEN | SOCK_CONNECT)) {
607 /* Listening socket -- don't read, just return activity */
608 /* Same for connection attempt */
609 /* (for strong connections, require a read to succeed first) */
610 if (socklist[i].flags & SOCK_PROXYWAIT) { /* drummer */
611 /* Hang around to get the return code from proxy */
612 grab = 10;
613 } else if (!(socklist[i].flags & SOCK_STRONGCONN)) {
614 debug1("net: connect! sock %d", socklist[i].sock);
615 s[0] = 0;
616 *len = 0;
617 return i;
618 }
619 } else if (socklist[i].flags & SOCK_PASS) {
620 s[0] = 0;
621 *len = 0;
622 return i;
623 }
624 if ((socklist[i].sock == STDOUT) && !backgrd)
625 x = read(STDIN, s, grab);
626 else
627 x = read(socklist[i].sock, s, grab);
628 if (x <= 0) { /* eof */
629 if (x == EAGAIN) {
630 s[0] = 0;
631 *len = 0;
632 return -3;
633 }
634 *len = socklist[i].sock;
635 socklist[i].flags &= ~SOCK_CONNECT;
636 debug1("net: eof!(read) socket %d", socklist[i].sock);
637 return -1;
638 }
639 s[x] = 0;
640 *len = x;
641 if (socklist[i].flags & SOCK_PROXYWAIT) {
642 debug2("net: socket: %d proxy errno: %d", socklist[i].sock, s[1]);
643 socklist[i].flags &= ~(SOCK_CONNECT | SOCK_PROXYWAIT);
644 switch (s[1]) {
645 case 90: /* Success */
646 s[0] = 0;
647 *len = 0;
648 return i;
649 case 91: /* Failed */
650 errno = ECONNREFUSED;
651 break;
652 case 92: /* No identd */
653 case 93: /* Identd said wrong username */
654 /* A better error message would be "socks misconfigured"
655 * or "identd not working" but this is simplest.
656 */
657 errno = ENETUNREACH;
658 break;
659 }
660 *len = socklist[i].sock;
661 return -1;
662 }
663 return i;
664 }
665 }
666 } else if (x == -1)
667 return -2; /* socket error */
668 else {
669 s[0] = 0;
670 *len = 0;
671 }
672 return -3;
673 }
674
675 /* sockgets: buffer and read from sockets
676 *
677 * Attempts to read from all registered sockets for up to one second. if
678 * after one second, no complete data has been received from any of the
679 * sockets, 's' will be empty, 'len' will be 0, and sockgets will return -3.
680 * if there is returnable data received from a socket, the data will be
681 * in 's' (null-terminated if non-binary), the length will be returned
682 * in len, and the socket number will be returned.
683 * normal sockets have their input buffered, and each call to sockgets
684 * will return one line terminated with a '\n'. binary sockets are not
685 * buffered and return whatever coems in as soon as it arrives.
686 * listening sockets will return an empty string when a connection comes in.
687 * connecting sockets will return an empty string on a successful connect,
688 * or EOF on a failed connect.
689 * if an EOF is detected from any of the sockets, that socket number will be
690 * put in len, and -1 will be returned.
691 * the maximum length of the string returned is 512 (including null)
692 */
693
694 int sockgets(char *s, int *len)
695 {
696 char xx[514], *p, *px;
697 int ret, i, data = 0;
698
699 Context;
700 for (i = 0; i < MAXSOCKS; i++) {
701 /* Check for stored-up data waiting to be processed */
702 if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].inbuf != NULL)) {
703 /* look for \r too cos windows can't follow RFCs */
704 p = strchr(socklist[i].inbuf, '\n');
705 if (p == NULL)
706 p = strchr(socklist[i].inbuf, '\r');
707 if (p != NULL) {
708 *p = 0;
709 if (strlen(socklist[i].inbuf) > 510)
710 socklist[i].inbuf[510] = 0;
711 strcpy(s, socklist[i].inbuf);
712 px = (char *) nmalloc(strlen(p + 1) + 1);
713 strcpy(px, p + 1);
714 nfree(socklist[i].inbuf);
715 if (px[0])
716 socklist[i].inbuf = px;
717 else {
718 nfree(px);
719 socklist[i].inbuf = NULL;
720 }
721 /* Strip CR if this was CR/LF combo */
722 if (s[strlen(s) - 1] == '\r')
723 s[strlen(s) - 1] = 0;
724 *len = strlen(s);
725 return socklist[i].sock;
726 }
727 }
728 /* Also check any sockets that might have EOF'd during write */
729 if (!(socklist[i].flags & SOCK_UNUSED)
730 && (socklist[i].flags & SOCK_EOFD)) {
731 Context;
732 s[0] = 0;
733 *len = socklist[i].sock;
734 return -1;
735 }
736 }
737 /* No pent-up data of any worth -- down to business */
738 Context;
739 *len = 0;
740 ret = sockread(xx, len);
741 if (ret < 0) {
742 s[0] = 0;
743 return ret;
744 }
745 /* Binary, listening and passed on sockets don't get buffered. */
746 if (socklist[ret].flags & SOCK_CONNECT) {
747 if (socklist[ret].flags & SOCK_STRONGCONN) {
748 socklist[ret].flags &= ~SOCK_STRONGCONN;
749 /* Buffer any data that came in, for future read */
750 socklist[ret].inbuf = (char *) nmalloc(strlen(xx) + 1);
751 strcpy(socklist[ret].inbuf, xx);
752 }
753 socklist[ret].flags &= ~SOCK_CONNECT;
754 s[0] = 0;
755 return socklist[ret].sock;
756 }
757 if (socklist[ret].flags & SOCK_BINARY) {
758 egg_memcpy(s, xx, *len);
759 return socklist[ret].sock;
760 }
761 if ((socklist[ret].flags & SOCK_LISTEN) ||
762 (socklist[ret].flags & SOCK_PASS))
763 return socklist[ret].sock;
764 Context;
765 /* Might be necessary to prepend stored-up data! */
766 if (socklist[ret].inbuf != NULL) {
767 p = socklist[ret].inbuf;
768 socklist[ret].inbuf = (char *) nmalloc(strlen(p) + strlen(xx) + 1);
769 strcpy(socklist[ret].inbuf, p);
770 strcat(socklist[ret].inbuf, xx);
771 nfree(p);
772 if (strlen(socklist[ret].inbuf) < 512) {
773 strcpy(xx, socklist[ret].inbuf);
774 nfree(socklist[ret].inbuf);
775 socklist[ret].inbuf = NULL;
776 } else {
777 p = socklist[ret].inbuf;
778 socklist[ret].inbuf = (char *) nmalloc(strlen(p) - 509);
779 strcpy(socklist[ret].inbuf, p + 510);
780 *(p + 510) = 0;
781 strcpy(xx, p);
782 nfree(p);
783 /* (leave the rest to be post-pended later) */
784 }
785 }
786 Context;
787 /* Look for EOL marker; if it's there, i have something to show */
788 p = strchr(xx, '\n');
789 if (p == NULL)
790 p = strchr(xx, '\r');
791 if (p != NULL) {
792 *p = 0;
793 strcpy(s, xx);
794 strcpy(xx, p + 1);
795 if (s[strlen(s) - 1] == '\r')
796 s[strlen(s) - 1] = 0;
797 data = 1; /* DCC_CHAT may now need to process a
798 blank line */
799 /* NO! */
800 /* if (!s[0]) strcpy(s," "); */
801 } else {
802 s[0] = 0;
803 if (strlen(xx) >= 510) {
804 /* String is too long, so just insert fake \n */
805 strcpy(s, xx);
806 xx[0] = 0;
807 data = 1;
808 }
809 }
810 Context;
811 *len = strlen(s);
812 /* Anything left that needs to be saved? */
813 if (!xx[0]) {
814 if (data)
815 return socklist[ret].sock;
816 else
817 return -3;
818 }
819 Context;
820 /* Prepend old data back */
821 if (socklist[ret].inbuf != NULL) {
822 Context;
823 p = socklist[ret].inbuf;
824 socklist[ret].inbuf = (char *) nmalloc(strlen(p) + strlen(xx) + 1);
825 strcpy(socklist[ret].inbuf, xx);
826 strcat(socklist[ret].inbuf, p);
827 nfree(p);
828 } else {
829 Context;
830 socklist[ret].inbuf = (char *) nmalloc(strlen(xx) + 1);
831 strcpy(socklist[ret].inbuf, xx);
832 }
833 Context;
834 if (data) {
835 Context;
836 return socklist[ret].sock;
837 } else {
838 Context;
839 return -3;
840 }
841 }
842
843 /* Dump something to a socket
844 *
845 * NOTE: Do NOT put Contexts in here if you want DEBUG to be meaningful!!
846 */
847 void tputs(register int z, char *s, unsigned int len)
848 {
849 register int i, x, idx;
850 char *p;
851 static int inhere = 0;
852
853 if (z < 0)
854 return; /* um... HELLO?! sanity check please! */
855 if (((z == STDOUT) || (z == STDERR)) && (!backgrd || use_stderr)) {
856 write(z, s, len);
857 return;
858 }
859 for (i = 0; i < MAXSOCKS; i++) {
860 if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].sock == z)) {
861 for (idx = 0; idx < dcc_total; idx++) {
862 if (dcc[idx].sock == z) {
863 if (dcc[idx].type) {
864 if (dcc[idx].type->name) {
865 if (!strncmp(dcc[idx].type->name, "BOT", 3)) {
866 otraffic_bn_today += len;
867 break;
868 } else if (!strcmp(dcc[idx].type->name, "SERVER")) {
869 otraffic_irc_today += len;
870 break;
871 } else if (!strncmp(dcc[idx].type->name, "CHAT", 4)) {
872 otraffic_dcc_today += len;
873 break;
874 } else if (!strncmp(dcc[idx].type->name, "FILES", 5)) {
875 otraffic_filesys_today += len;
876 break;
877 } else if (!strcmp(dcc[idx].type->name, "SEND")) {
878 otraffic_trans_today += len;
879 break;
880 } else if (!strncmp(dcc[idx].type->name, "GET", 3)) {
881 otraffic_trans_today += len;
882 break;
883 } else {
884 otraffic_unknown_today += len;
885 break;
886 }
887 }
888 }
889 }
890 }
891
892 if (socklist[i].outbuf != NULL) {
893 /* Already queueing: just add it */
894 p = (char *) nrealloc(socklist[i].outbuf, socklist[i].outbuflen + len);
895 egg_memcpy(p + socklist[i].outbuflen, s, len);
896 socklist[i].outbuf = p;
897 socklist[i].outbuflen += len;
898 return;
899 }
900 /* Try. */
901 x = write(z, s, len);
902 if (x == (-1))
903 x = 0;
904 if (x < len) {
905 /* Socket is full, queue it */
906 socklist[i].outbuf = (char *) nmalloc(len - x);
907 egg_memcpy(socklist[i].outbuf, &s[x], len - x);
908 socklist[i].outbuflen = len - x;
909 }
910 return;
911 }
912 }
913 /* Make sure we don't cause a crash by looping here */
914 if (!inhere) {
915 inhere = 1;
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 inhere = 0;
922 }
923 }
924
925 /* tputs might queue data for sockets, let's dump as much of it as
926 * possible.
927 */
928 void dequeue_sockets()
929 {
930 int i, x;
931
932 for (i = 0; i < MAXSOCKS; i++) {
933 if (!(socklist[i].flags & SOCK_UNUSED) &&
934 (socklist[i].outbuf != NULL)) {
935 /* Trick tputs into doing the work */
936 x = write(socklist[i].sock, socklist[i].outbuf,
937 socklist[i].outbuflen);
938 if ((x < 0) && (errno != EAGAIN)
939 #ifdef EBADSLT
940 && (errno != EBADSLT)
941 #endif
942 #ifdef ENOTCONN
943 && (errno != ENOTCONN)
944 #endif
945 ) {
946 /* This detects an EOF during writing */
947 debug3("net: eof!(write) socket %d (%s,%d)", socklist[i].sock,
948 strerror(errno), errno);
949 socklist[i].flags |= SOCK_EOFD;
950 } else if (x == socklist[i].outbuflen) {
951 /* If the whole buffer was sent, nuke it */
952 nfree(socklist[i].outbuf);
953 socklist[i].outbuf = NULL;
954 socklist[i].outbuflen = 0;
955 } else if (x > 0) {
956 char *p = socklist[i].outbuf;
957
958 /* This removes any sent bytes from the beginning of the buffer */
959 socklist[i].outbuf = (char *) nmalloc(socklist[i].outbuflen - x);
960 egg_memcpy(socklist[i].outbuf, p + x, socklist[i].outbuflen - x);
961 socklist[i].outbuflen -= x;
962 nfree(p);
963 }
964
965 /* All queued data was sent. Call handler if one exists and the
966 * dcc entry wants it.
967 */
968 if (!socklist[i].outbuf) {
969 int idx = findanyidx(socklist[i].sock);
970
971 if ((idx > 0) && dcc[idx].type && dcc[idx].type->outdone)
972 dcc[idx].type->outdone(idx);
973 }
974 }
975 }
976 }
977
978
979 /*
980 * Debugging stuff
981 */
982
983 void tell_netdebug(int idx)
984 {
985 int i;
986 char s[80];
987
988 dprintf(idx, "Open sockets:");
989 for (i = 0; i < MAXSOCKS; i++) {
990 if (!(socklist[i].flags & SOCK_UNUSED)) {
991 sprintf(s, " %d", socklist[i].sock);
992 if (socklist[i].flags & SOCK_BINARY)
993 strcat(s, " (binary)");
994 if (socklist[i].flags & SOCK_LISTEN)
995 strcat(s, " (listen)");
996 if (socklist[i].flags & SOCK_PASS)
997 strcat(s, " (passed on)");
998 if (socklist[i].flags & SOCK_CONNECT)
999 strcat(s, " (connecting)");
1000 if (socklist[i].flags & SOCK_STRONGCONN)
1001 strcat(s, " (strong)");
1002 if (socklist[i].flags & SOCK_NONSOCK)
1003 strcat(s, " (file)");
1004 if (socklist[i].inbuf != NULL)
1005 sprintf(&s[strlen(s)], " (inbuf: %04X)", strlen(socklist[i].inbuf));
1006 if (socklist[i].outbuf != NULL)
1007 sprintf(&s[strlen(s)], " (outbuf: %06lX)", socklist[i].outbuflen);
1008 strcat(s, ",");
1009 dprintf(idx, "%s", s);
1010 }
1011 }
1012 dprintf(idx, " done.\n");
1013 }
1014
1015 /* Security-flavoured sanity checking on DCC connections of all sorts can be
1016 * done with this routine. Feed it the proper information from your DCC
1017 * before you attempt the connection, and this will make an attempt at
1018 * figuring out if the connection is really that person, or someone screwing
1019 * around. It's not foolproof, but anything that fails this check probably
1020 * isn't going to work anyway due to masquerading firewalls, NAT routers,
1021 * or bugs in mIRC.
1022 */
1023 int sanitycheck_dcc(char *nick, char *from, char *ipaddy, char *port)
1024 {
1025 /* According to the latest RFC, the clients SHOULD be able to handle
1026 * DNS names that are up to 255 characters long. This is not broken.
1027 */
1028 char badaddress[16];
1029 IP ip = my_atoul(ipaddy);
1030 int prt = atoi(port);
1031
1032 /* It is disabled HERE so we only have to check in *one* spot! */
1033 if (!dcc_sanitycheck)
1034 return 1;
1035 Context; /* This should be pretty solid, but
1036 something _might_ break. */
1037 if (prt < 1) {
1038 putlog(LOG_MISC, "*", "ALERT: (%s!%s) specified an impossible port of %u!",
1039 nick, from, prt);
1040 return 0;
1041 }
1042 sprintf(badaddress, "%u.%u.%u.%u", (ip >> 24) & 0xff, (ip >> 16) & 0xff,
1043 (ip >> 8) & 0xff, ip & 0xff);
1044 if (ip < (1 << 24)) {
1045 putlog(LOG_MISC, "*", "ALERT: (%s!%s) specified an impossible IP of %s!",
1046 nick, from, badaddress);
1047 return 0;
1048 }
1049 return 1;
1050 }
1051
1052 int hostsanitycheck_dcc(char *nick, char *from, IP ip, char *dnsname,
1053 char *prt)
1054 {
1055 /* According to the latest RFC, the clients SHOULD be able to handle
1056 * DNS names that are up to 255 characters long. This is not broken.
1057 */
1058 char hostname[256], badaddress[16];
1059
1060 /* It is disabled HERE so we only have to check in *one* spot! */
1061 if (!dcc_sanitycheck)
1062 return 1;
1063 Context; /* This should be pretty solid, but
1064 something _might_ break. */
1065 sprintf(badaddress, "%u.%u.%u.%u", (ip >> 24) & 0xff, (ip >> 16) & 0xff,
1066 (ip >> 8) & 0xff, ip & 0xff);
1067 /* These should pad like crazy with zeros, since 120 bytes or so is
1068 * where the routines providing our data currently lose interest. I'm
1069 * using the n-variant in case someone changes that...
1070 */
1071 strncpy(hostname, extracthostname(from), 255);
1072 hostname[255] = 0;
1073 if (!egg_strcasecmp(hostname, dnsname)) {
1074 putlog(LOG_DEBUG, "*", "DNS information for submitted IP checks out.");
1075 return 1;
1076 }
1077 if (!strcmp(badaddress, dnsname))
1078 putlog(LOG_MISC, "*", "ALERT: (%s!%s) sent a DCC request with bogus IP information of %s port %u!",
1079 nick, from, badaddress, prt);
1080 else
1081 return 1; /* <- usually happens when we have
1082 a user with an unresolved hostmask! */
1083 return 0;
1084 }
1085
1086 /* Checks wether the referenced socket has data queued.
1087 *
1088 * Returns true if the incoming/outgoing (depending on 'type') queues
1089 * contain data, otherwise false.
1090 */
1091 int sock_has_data(int type, int sock)
1092 {
1093 int ret = 0, i;
1094
1095 for (i = 0; i < MAXSOCKS; i++)
1096 if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].sock == sock))
1097 break;
1098 if (i < MAXSOCKS) {
1099 switch (type) {
1100 case SOCK_DATA_OUTGOING:
1101 ret = (socklist[i].outbuf != NULL);
1102 break;
1103 case SOCK_DATA_INCOMING:
1104 ret = (socklist[i].inbuf != NULL);
1105 break;
1106 }
1107 }
1108 return ret;
1109 }

webmaster@eggheads.org
ViewVC Help
Powered by ViewVC 1.1.23