/[cvs]/eggdrop1.4/src/net.c
ViewVC logotype

Contents of /eggdrop1.4/src/net.c

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


Revision 1.3 - (show annotations) (download) (as text)
Sun Jul 4 15:42:19 1999 UTC (20 years, 5 months ago) by segfault
Branch: MAIN
Changes since 1.2: +2 -3 lines
File MIME type: text/x-chdr
Poptix's unresolved host 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
38 char hostname[121] = ""; /* hostname can be specified in the config
39 * file */
40 char myip[121] = ""; /* IP can be specified in the config file */
41 char firewall[121] = ""; /* socks server for firewall */
42 int firewallport = 1080; /* default port of Sock4/5 firewalls */
43 char botuser[21] = "eggdrop"; /* username of the user running the bot */
44 int dcc_sanitycheck = 0; /* we should do some sanity checking on dcc
45 * connections. */
46 sock_list *socklist = 0; /* enough to be safe */
47 int MAXSOCKS = 0;
48
49 /* types of proxy */
50 #define PROXY_SOCKS 1
51 #define PROXY_SUN 2
52
53 jmp_buf alarmret; /* env buffer for alarm() returns */
54
55 /* i need an UNSIGNED long for dcc type stuff */
56 IP my_atoul(char *s)
57 {
58 IP ret = 0;
59
60 while ((*s >= '0') && (*s <= '9')) {
61 ret *= 10;
62 ret += ((*s) - '0');
63 s++;
64 }
65 return ret;
66 }
67
68 #define my_ntohs(sh) swap_short(sh)
69 #define my_htons(sh) swap_short(sh)
70 #define my_ntohl(ln) swap_long(ln)
71 #define my_htonl(ln) swap_long(ln)
72
73 /* i read somewhere that memcpy() is broken on some machines */
74 /* it's easy to replace, so i'm not gonna take any chances, because
75 * it's pretty important that it work correctly here */
76 void my_memcpy(char *dest, char *src, int len)
77 {
78 while (len--)
79 *dest++ = *src++;
80 }
81
82 #ifndef HAVE_BZERO
83 /* bzero() is bsd-only, so here's one for non-bsd systems */
84 void bzero(char *dest, int len)
85 {
86 while (len--)
87 *dest++ = 0;
88 }
89 #endif
90
91 /* initialize the socklist */
92 void init_net()
93 {
94 int i;
95
96 for (i = 0; i < MAXSOCKS; i++) {
97 socklist[i].flags = SOCK_UNUSED;
98 }
99 }
100
101 int expmem_net()
102 {
103 int i, tot = 0;
104
105 context;
106 for (i = 0; i < MAXSOCKS; i++) {
107 if (!(socklist[i].flags & SOCK_UNUSED)) {
108 if (socklist[i].inbuf != NULL)
109 tot += strlen(socklist[i].inbuf) + 1;
110 if (socklist[i].outbuf != NULL)
111 tot += socklist[i].outbuflen;
112 }
113 }
114 return tot;
115 }
116
117 /* get my ip number */
118 IP getmyip()
119 {
120 struct hostent *hp;
121 char s[121];
122 IP ip;
123 struct in_addr *in;
124
125 /* could be pre-defined */
126 if (myip[0]) {
127 if ((myip[strlen(myip) - 1] >= '0') && (myip[strlen(myip) - 1] <= '9'))
128 return (IP) inet_addr(myip);
129 }
130 /* also could be pre-defined */
131 if (hostname[0])
132 hp = gethostbyname(hostname);
133 else {
134 gethostname(s, 120);
135 hp = gethostbyname(s);
136 }
137 if (hp == NULL)
138 fatal("Hostname self-lookup failed.", 0);
139 in = (struct in_addr *) (hp->h_addr_list[0]);
140 ip = (IP) (in->s_addr);
141 return ip;
142 }
143
144 void neterror(char *s)
145 {
146 switch (errno) {
147 case EADDRINUSE:
148 strcpy(s, "Address already in use");
149 break;
150 case EADDRNOTAVAIL:
151 strcpy(s, "Address invalid on remote machine");
152 break;
153 case EAFNOSUPPORT:
154 strcpy(s, "Address family not supported");
155 break;
156 case EALREADY:
157 strcpy(s, "Socket already in use");
158 break;
159 case EBADF:
160 strcpy(s, "Socket descriptor is bad");
161 break;
162 case ECONNREFUSED:
163 strcpy(s, "Connection refused");
164 break;
165 case EFAULT:
166 strcpy(s, "Namespace segment violation");
167 break;
168 case EINPROGRESS:
169 strcpy(s, "Operation in progress");
170 break;
171 case EINTR:
172 strcpy(s, "Timeout");
173 break;
174 case EINVAL:
175 strcpy(s, "Invalid namespace");
176 break;
177 case EISCONN:
178 strcpy(s, "Socket already connected");
179 break;
180 case ENETUNREACH:
181 strcpy(s, "Network unreachable");
182 break;
183 case ENOTSOCK:
184 strcpy(s, "File descriptor, not a socket");
185 break;
186 case ETIMEDOUT:
187 strcpy(s, "Connection timed out");
188 break;
189 case ENOTCONN:
190 strcpy(s, "Socket is not connected");
191 break;
192 case EHOSTUNREACH:
193 strcpy(s, "Host is unreachable");
194 break;
195 case EPIPE:
196 strcpy(s, "Broken pipe");
197 break;
198 #ifdef ECONNRESET
199 case ECONNRESET:
200 strcpy(s, "Connection reset by peer");
201 break;
202 #endif
203 #ifdef EACCES
204 case EACCES:
205 strcpy(s, "Permission denied");
206 break;
207 #endif
208 case 0:
209 strcpy(s, "Error 0");
210 break;
211 default:
212 sprintf(s, "Unforseen error %d", errno);
213 break;
214 }
215 }
216
217 /* request a normal socket for i/o */
218 void setsock(int sock, int options)
219 {
220 int i;
221 int parm;
222
223 for (i = 0; i < MAXSOCKS; i++) {
224 if (socklist[i].flags & SOCK_UNUSED) {
225 /* yay! there is table space */
226 socklist[i].inbuf = socklist[i].outbuf = NULL;
227 socklist[i].outbuflen = 0;
228 socklist[i].flags = options;
229 socklist[i].sock = sock;
230 if (((sock != STDOUT) || backgrd) &&
231 !(socklist[i].flags & SOCK_NONSOCK)) {
232 parm = 1;
233 setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (void *) &parm,
234 sizeof(int));
235
236 parm = 0;
237 setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *) &parm, sizeof(int));
238 }
239 if (options & SOCK_LISTEN) {
240 /* Tris says this lets us grab the same port again next time */
241 parm = 1;
242 setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *) &parm,
243 sizeof(int));
244 }
245 /* yay async i/o ! */
246 fcntl(sock, F_SETFL, O_NONBLOCK);
247 return;
248 }
249 }
250 fatal("Socket table is full!", 0);
251 }
252
253 int getsock(int options)
254 {
255 int sock = socket(AF_INET, SOCK_STREAM, 0);
256
257 if (sock < 0)
258 fatal("Can't open a socket at all!", 0);
259 setsock(sock, options);
260 return sock;
261 }
262
263 /* done with a socket */
264 void killsock(int sock)
265 {
266 int i;
267
268 for (i = 0; i < MAXSOCKS; i++) {
269 if (socklist[i].sock == sock) {
270 close(socklist[i].sock);
271 if (socklist[i].inbuf != NULL) {
272 nfree(socklist[i].inbuf);
273 socklist[i].inbuf = NULL;
274 }
275 if (socklist[i].outbuf != NULL) {
276 nfree(socklist[i].outbuf);
277 socklist[i].outbuf = NULL;
278 socklist[i].outbuflen = 0;
279 }
280 socklist[i].flags = SOCK_UNUSED;
281 return;
282 }
283 }
284 putlog(LOG_MISC, "*", "Attempt to kill un-allocated socket %d !!", sock);
285 }
286
287 /* send connection request to proxy */
288 static int proxy_connect(int sock, char *host, int port, int proxy)
289 {
290 unsigned char x[10];
291 struct hostent *hp;
292 char s[30];
293
294 /* socks proxy */
295 if (proxy == PROXY_SOCKS) {
296 /* numeric IP? */
297 if ((host[strlen(host) - 1] >= '0') && (host[strlen(host) - 1] <= '9')) {
298 IP ip = ((IP) inet_addr(host)); /* drummer */
299 my_memcpy((char *) x, (char *) &ip, 4); /* Beige@Efnet */
300 } else {
301 /* no, must be host.domain */
302 if (!setjmp(alarmret)) {
303 alarm(resolve_timeout);
304 hp = gethostbyname(host);
305 alarm(0);
306 } else {
307 hp = NULL;
308 }
309 if (hp == NULL) {
310 killsock(sock);
311 return -2;
312 }
313 my_memcpy((char *) x, (char *) hp->h_addr, hp->h_length);
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 write(sock, s, strlen(botuser) + 9);
318 } else if (proxy == PROXY_SUN) {
319 sprintf(s, "%s %d\n", host, port);
320 write(sock, s, strlen(s));
321 }
322 return sock;
323 }
324
325 /* starts a connection attempt to a socket
326 * returns <0 if connection refused:
327 * -1 neterror() type error
328 * -2 can't resolve hostname */
329 int open_telnet_raw(int sock, char *server, int sport)
330 {
331 struct sockaddr_in name;
332 struct hostent *hp;
333 char host[121];
334 int i, port;
335 volatile int proxy;
336
337 /* firewall? use socks */
338 if (firewall[0]) {
339 if (firewall[0] == '!') {
340 proxy = PROXY_SUN;
341 strcpy(host, &firewall[1]);
342 } else {
343 proxy = PROXY_SOCKS;
344 strcpy(host, firewall);
345 }
346 port = firewallport;
347 } else {
348 proxy = 0;
349 strcpy(host, server);
350 port = sport;
351 }
352 /* patch by tris for multi-hosted machines: */
353 bzero((char *) &name, sizeof(struct sockaddr_in));
354
355 name.sin_family = AF_INET;
356 name.sin_addr.s_addr = (myip[0] ? getmyip() : INADDR_ANY);
357 if (bind(sock, (struct sockaddr *) &name, sizeof(name)) < 0) {
358 killsock(sock);
359 return -1;
360 }
361 bzero((char *) &name, sizeof(struct sockaddr_in));
362
363 name.sin_family = AF_INET;
364 name.sin_port = my_htons(port);
365 /* numeric IP? */
366 if ((host[strlen(host) - 1] >= '0') && (host[strlen(host) - 1] <= '9'))
367 name.sin_addr.s_addr = inet_addr(host);
368 else {
369 /* no, must be host.domain */
370 if (!setjmp(alarmret)) {
371 alarm(resolve_timeout);
372 hp = gethostbyname(host);
373 alarm(0);
374 } else {
375 hp = NULL;
376 }
377 if (hp == NULL) {
378 killsock(sock);
379 return -2;
380 }
381 my_memcpy((char *) &name.sin_addr, hp->h_addr, hp->h_length);
382 name.sin_family = hp->h_addrtype;
383 }
384 for (i = 0; i < MAXSOCKS; i++) {
385 if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].sock == sock))
386 socklist[i].flags |= SOCK_CONNECT;
387 }
388 if (connect(sock, (struct sockaddr *) &name,
389 sizeof(struct sockaddr_in)) < 0) {
390 if (errno == EINPROGRESS) {
391 /* firewall? announce connect attempt to proxy */
392 if (firewall[0])
393 return proxy_connect(sock, server, sport, proxy);
394 return sock; /* async success! */
395 } else {
396 killsock(sock);
397 return -1;
398 }
399 }
400 /* synchronous? :/ */
401 if (firewall[0])
402 return proxy_connect(sock, server, sport, proxy);
403 return sock;
404 }
405
406 /* ordinary non-binary connection attempt */
407 int open_telnet(char *server, int port)
408 {
409 return open_telnet_raw(getsock(0), server, port);
410 }
411
412 /* returns a socket number for a listening socket that will accept any
413 * connection -- port # is returned in port */
414 int open_listen(int *port)
415 {
416 int sock, addrlen;
417 struct sockaddr_in name;
418
419 if (firewall[0]) {
420 /* FIXME: can't do listen port thru firewall yet */
421 putlog(LOG_ALL, "*", "!! Cant open a listen port (you are using a firewall)\n");
422 return -1;
423 }
424 sock = getsock(SOCK_LISTEN);
425 bzero((char *) &name, sizeof(struct sockaddr_in));
426
427 name.sin_family = AF_INET;
428 name.sin_port = my_htons(*port); /* 0 = just assign us a port */
429 name.sin_addr.s_addr = (myip[0] ? getmyip() : INADDR_ANY);
430 if (bind(sock, (struct sockaddr *) &name, sizeof(name)) < 0) {
431 killsock(sock);
432 return -1;
433 }
434 /* what port are we on? */
435 addrlen = sizeof(name);
436 if (getsockname(sock, (struct sockaddr *) &name, &addrlen) < 0) {
437 killsock(sock);
438 return -1;
439 }
440 *port = my_ntohs(name.sin_port);
441 if (listen(sock, 1) < 0) {
442 killsock(sock);
443 return -1;
444 }
445 return sock;
446 }
447
448 /* given network-style IP address, return hostname */
449 /* hostname will be "##.##.##.##" format if there was an error */
450 char *hostnamefromip(unsigned long ip)
451 {
452 struct hostent *hp;
453 unsigned long addr = ip;
454 unsigned char *p;
455 static char s[121];
456
457 if (!setjmp(alarmret)) {
458 alarm(resolve_timeout);
459 hp = gethostbyaddr((char *) &addr, sizeof(addr), AF_INET);
460 alarm(0);
461 } else {
462 hp = NULL;
463 }
464 if (hp == NULL) {
465 p = (unsigned char *) &addr;
466 sprintf(s, "%u.%u.%u.%u", p[0], p[1], p[2], p[3]);
467 return s;
468 }
469 strncpy(s, hp->h_name, 120);
470 s[120] = 0;
471 return s;
472 }
473
474 /* short routine to answer a connect received on a socket made previously
475 * by open_listen ... returns hostname of the caller & the new socket
476 * does NOT dispose of old "public" socket! */
477 int answer(int sock, char *caller, unsigned long *ip,
478 unsigned short *port, int binary)
479 {
480 int new_sock, addrlen;
481 struct sockaddr_in from;
482 addrlen = sizeof(struct sockaddr);
483
484 new_sock = accept(sock, (struct sockaddr *) &from, &addrlen);
485 if (new_sock < 0)
486 return -1;
487 if (ip != NULL) {
488 *ip = from.sin_addr.s_addr;
489 strncpy(caller, hostnamefromip(*ip), 120);
490 caller[120] = 0;
491 *ip = my_ntohl(*ip);
492 }
493 if (port != NULL)
494 *port = my_ntohs(from.sin_port);
495 /* set up all the normal socket crap */
496 setsock(new_sock, (binary ? SOCK_BINARY : 0));
497 return new_sock;
498 }
499
500 /* like open_telnet, but uses server & port specifications of dcc */
501 int open_telnet_dcc(int sock, char *server, char *port)
502 {
503 int p;
504 unsigned long addr;
505 char sv[121];
506 unsigned char c[4];
507
508 if (port != NULL)
509 p = atoi(port);
510 else
511 p = 2000;
512 if (server != NULL)
513 addr = my_atoul(server);
514 else
515 addr = 0L;
516 if (addr < (1 << 24))
517 return -3; /* fake address */
518 c[0] = (addr >> 24) & 0xff;
519 c[1] = (addr >> 16) & 0xff;
520 c[2] = (addr >> 8) & 0xff;
521 c[3] = addr & 0xff;
522 sprintf(sv, "%u.%u.%u.%u", c[0], c[1], c[2], c[3]);
523 /* strcpy(sv,hostnamefromip(addr)); */
524 p = open_telnet_raw(sock, sv, p);
525 return p;
526 }
527
528 /* all new replacements for mtgets/mtread */
529
530 /* attempts to read from all the sockets in socklist
531 * fills s with up to 511 bytes if available, and returns the array index
532 * on EOF, returns -1, with socket in len
533 * on socket error, returns -2
534 * if nothing is ready, returns -3 */
535 static int sockread(char *s, int *len)
536 {
537 fd_set fd;
538 int fds, i, x;
539 struct timeval t;
540 int grab = 511;
541
542 fds = getdtablesize();
543 #ifdef FD_SETSIZE
544 if (fds > FD_SETSIZE)
545 fds = FD_SETSIZE; /* fixes YET ANOTHER freebsd bug!!! */
546 #endif
547 /* timeout: 1 sec */
548 t.tv_sec = 1;
549 t.tv_usec = 0;
550 FD_ZERO(&fd);
551 for (i = 0; i < MAXSOCKS; i++)
552 if (!(socklist[i].flags & SOCK_UNUSED)) {
553 if ((socklist[i].sock == STDOUT) && !backgrd)
554 FD_SET(STDIN, &fd);
555 else
556 FD_SET(socklist[i].sock, &fd);
557 }
558 #ifdef HPUX_HACKS
559 #ifndef HPUX10_HACKS
560 x = select(fds, (int *) &fd, (int *) NULL, (int *) NULL, &t);
561 #else
562 x = select(fds, &fd, NULL, NULL, &t);
563 #endif
564 #else
565 x = select(fds, &fd, NULL, NULL, &t);
566 #endif
567 if (x > 0) {
568 /* something happened */
569 for (i = 0; i < MAXSOCKS; i++) {
570 if ((!(socklist[i].flags & SOCK_UNUSED)) &&
571 ((FD_ISSET(socklist[i].sock, &fd)) ||
572 ((socklist[i].sock == STDOUT) && (!backgrd) &&
573 (FD_ISSET(STDIN, &fd))))) {
574 if (socklist[i].flags & (SOCK_LISTEN | SOCK_CONNECT)) {
575 /* listening socket -- don't read, just return activity */
576 /* same for connection attempt */
577 /* (for strong connections, require a read to succeed first) */
578 if ((firewall[0]) && (firewall[0] != '!') &&
579 (socklist[i].flags & SOCK_CONNECT)) {
580 /* hang around to get the return code from proxy */
581 grab = 8;
582 } else if (!(socklist[i].flags & SOCK_STRONGCONN)) {
583 debug1("net: connect! sock %d", socklist[i].sock);
584 s[0] = 0;
585 *len = 0;
586 return i;
587 }
588 }
589 if ((socklist[i].sock == STDOUT) && !backgrd)
590 x = read(STDIN, s, grab);
591 else
592 x = read(socklist[i].sock, s, grab);
593 if (x <= 0) { /* eof */
594 if (x == EAGAIN) {
595 s[0] = 0;
596 *len = 0;
597 return -3;
598 }
599 *len = socklist[i].sock;
600 socklist[i].flags &= ~SOCK_CONNECT;
601 debug1("net: eof!(read) socket %d", socklist[i].sock);
602 return -1;
603 }
604 s[x] = 0;
605 *len = x;
606 if ((firewall[0]) && (socklist[i].flags & SOCK_CONNECT)) {
607 switch (s[1]) {
608 case 90: /* success */
609 s[0] = 0;
610 *len = 0;
611 return i;
612 case 91: /* failed */
613 errno = ECONNREFUSED;
614 break;
615 case 92: /* no identd */
616 case 93: /* identd said wrong username */
617 errno = ENETUNREACH;
618 break;
619 /* a better error message would be "socks misconfigured" */
620 /* or "identd not working" but this is simplest */
621 }
622 *len = socklist[i].sock;
623 socklist[i].flags &= ~SOCK_CONNECT;
624 return -1;
625 }
626 return i;
627 }
628 }
629 } else if (x == -1)
630 return -2; /* socket error */
631 else {
632 s[0] = 0;
633 *len = 0;
634 }
635 return -3;
636 }
637
638 /* sockgets: buffer and read from sockets
639 *
640 * attempts to read from all registered sockets for up to one second. if
641 * after one second, no complete data has been received from any of the
642 * sockets, 's' will be empty, 'len' will be 0, and sockgets will return -3.
643 * if there is returnable data received from a socket, the data will be
644 * in 's' (null-terminated if non-binary), the length will be returned
645 * in len, and the socket number will be returned.
646 * normal sockets have their input buffered, and each call to sockgets
647 * will return one line terminated with a '\n'. binary sockets are not
648 * buffered and return whatever coems in as soon as it arrives.
649 * listening sockets will return an empty string when a connection comes in.
650 * connecting sockets will return an empty string on a successful connect,
651 * or EOF on a failed connect.
652 * if an EOF is detected from any of the sockets, that socket number will be
653 * put in len, and -1 will be returned.
654 * the maximum length of the string returned is 512 (including null)
655 */
656
657 int sockgets(char *s, int *len)
658 {
659 char xx[514], *p, *px;
660 int ret, i, data = 0;
661
662 context;
663 for (i = 0; i < MAXSOCKS; i++) {
664 /* check for stored-up data waiting to be processed */
665 if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].inbuf != NULL)) {
666 /* look for \r too cos windows can't follow RFCs */
667 p = strchr(socklist[i].inbuf, '\n');
668 if (p == NULL)
669 p = strchr(socklist[i].inbuf, '\r');
670 if (p != NULL) {
671 *p = 0;
672 if (strlen(socklist[i].inbuf) > 510)
673 socklist[i].inbuf[510] = 0;
674 strcpy(s, socklist[i].inbuf);
675 px = (char *) nmalloc(strlen(p + 1) + 1);
676 strcpy(px, p + 1);
677 nfree(socklist[i].inbuf);
678 if (px[0])
679 socklist[i].inbuf = px;
680 else {
681 nfree(px);
682 socklist[i].inbuf = NULL;
683 }
684 /* strip CR if this was CR/LF combo */
685 if (s[strlen(s) - 1] == '\r')
686 s[strlen(s) - 1] = 0;
687 *len = strlen(s);
688 return socklist[i].sock;
689 }
690 }
691 /* also check any sockets that might have EOF'd during write */
692 if (!(socklist[i].flags & SOCK_UNUSED)
693 && (socklist[i].flags & SOCK_EOFD)) {
694 context;
695 s[0] = 0;
696 *len = socklist[i].sock;
697 return -1;
698 }
699 }
700 /* no pent-up data of any worth -- down to business */
701 context;
702 *len = 0;
703 ret = sockread(xx, len);
704 if (ret < 0) {
705 s[0] = 0;
706 return ret;
707 }
708 /* binary and listening sockets don't get buffered */
709 if (socklist[ret].flags & SOCK_CONNECT) {
710 if (socklist[ret].flags & SOCK_STRONGCONN) {
711 socklist[ret].flags &= ~SOCK_STRONGCONN;
712 /* buffer any data that came in, for future read */
713 socklist[ret].inbuf = (char *) nmalloc(strlen(xx) + 1);
714 strcpy(socklist[ret].inbuf, xx);
715 }
716 socklist[ret].flags &= ~SOCK_CONNECT;
717 s[0] = 0;
718 return socklist[ret].sock;
719 }
720 if (socklist[ret].flags & SOCK_BINARY) {
721 my_memcpy(s, xx, *len);
722 return socklist[ret].sock;
723 }
724 if (socklist[ret].flags & SOCK_LISTEN)
725 return socklist[ret].sock;
726 context;
727 /* might be necessary to prepend stored-up data! */
728 if (socklist[ret].inbuf != NULL) {
729 p = socklist[ret].inbuf;
730 socklist[ret].inbuf = (char *) nmalloc(strlen(p) + strlen(xx) + 1);
731 strcpy(socklist[ret].inbuf, p);
732 strcat(socklist[ret].inbuf, xx);
733 nfree(p);
734 if (strlen(socklist[ret].inbuf) < 512) {
735 strcpy(xx, socklist[ret].inbuf);
736 nfree(socklist[ret].inbuf);
737 socklist[ret].inbuf = NULL;
738 } else {
739 p = socklist[ret].inbuf;
740 socklist[ret].inbuf = (char *) nmalloc(strlen(p) - 509);
741 strcpy(socklist[ret].inbuf, p + 510);
742 *(p + 510) = 0;
743 strcpy(xx, p);
744 nfree(p);
745 /* (leave the rest to be post-pended later) */
746 }
747 }
748 context;
749 /* look for EOL marker; if it's there, i have something to show */
750 p = strchr(xx, '\n');
751 if (p == NULL)
752 p = strchr(xx, '\r');
753 if (p != NULL) {
754 *p = 0;
755 strcpy(s, xx);
756 strcpy(xx, p + 1);
757 if (s[strlen(s) - 1] == '\r')
758 s[strlen(s) - 1] = 0;
759 data = 1; /* DCC_CHAT may now need to process a
760 * blank line */
761 /* NO! */
762 /* if (!s[0]) strcpy(s," "); */
763 } else {
764 s[0] = 0;
765 if (strlen(xx) >= 510) {
766 /* string is too long, so just insert fake \n */
767 strcpy(s, xx);
768 xx[0] = 0;
769 data = 1;
770 }
771 }
772 context;
773 *len = strlen(s);
774 /* anything left that needs to be saved? */
775 if (!xx[0]) {
776 if (data)
777 return socklist[ret].sock;
778 else
779 return -3;
780 }
781 context;
782 /* prepend old data back */
783 if (socklist[ret].inbuf != NULL) {
784 contextnote("dw's bug");
785 p = socklist[ret].inbuf;
786 socklist[ret].inbuf = (char *) nmalloc(strlen(p) + strlen(xx) + 1);
787 strcpy(socklist[ret].inbuf, xx);
788 strcat(socklist[ret].inbuf, p);
789 nfree(p);
790 } else {
791 contextnote("dw's bug");
792 socklist[ret].inbuf = (char *) nmalloc(strlen(xx) + 1);
793 strcpy(socklist[ret].inbuf, xx);
794 }
795 contextnote("dw's bug");
796 if (data) {
797 contextnote("dw's bug");
798 return socklist[ret].sock;
799 } else {
800 contextnote("dw's bug");
801 return -3;
802 }
803 }
804
805 /* dump something to a socket */
806 /* DO NOT PUT CONTEXTS IN HERE IF YOU WANT DEBUG TO BE MEANINGFUL!!! */
807 void tputs(int z, char *s, unsigned int len)
808 {
809 int i, x;
810 char *p;
811
812 if (z < 0)
813 return; /* um... HELLO?! sanity check please! */
814 if (((z == STDOUT) || (z == STDERR)) && (!backgrd || use_stderr)) {
815 write(z, s, len);
816 return;
817 }
818 for (i = 0; i < MAXSOCKS; i++) {
819 if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].sock == z)) {
820 if (socklist[i].outbuf != NULL) {
821 /* already queueing: just add it */
822 p = (char *) nrealloc(socklist[i].outbuf, socklist[i].outbuflen + len);
823 my_memcpy(p + socklist[i].outbuflen, s, len);
824 socklist[i].outbuf = p;
825 socklist[i].outbuflen += len;
826 return;
827 }
828 /* try. */
829 x = write(z, s, len);
830 if (x == (-1))
831 x = 0;
832 if (x < len) {
833 /* socket is full, queue it */
834 socklist[i].outbuf = (char *) nmalloc(len - x);
835 my_memcpy(socklist[i].outbuf, &s[x], len - x);
836 socklist[i].outbuflen = len - x;
837 }
838 return;
839 }
840 }
841 putlog(LOG_MISC, "*", "!!! writing to nonexistent socket: %d", z);
842 s[strlen(s) - 1] = 0;
843 putlog(LOG_MISC, "*", "!-> '%s'", s);
844 }
845
846 /* tputs might queue data for sockets, let's dump as much of it as
847 * possible */
848 void dequeue_sockets()
849 {
850 int i, x;
851
852 for (i = 0; i < MAXSOCKS; i++) {
853 if (!(socklist[i].flags & SOCK_UNUSED) &&
854 (socklist[i].outbuf != NULL)) {
855 /* trick tputs into doing the work */
856 x = write(socklist[i].sock, socklist[i].outbuf,
857 socklist[i].outbuflen);
858 if ((x < 0) && (errno != EAGAIN)
859 #ifdef EBADSLT
860 && (errno != EBADSLT)
861 #endif
862 #ifdef ENOTCONN
863 && (errno != ENOTCONN)
864 #endif
865 ) {
866 /* this detects an EOF during writing */
867 debug3("net: eof!(write) socket %d (%s,%d)", socklist[i].sock,
868 strerror(errno), errno);
869 socklist[i].flags |= SOCK_EOFD;
870 } else if (x == socklist[i].outbuflen) {
871 /* if the whole buffer was sent, nuke it */
872 nfree(socklist[i].outbuf);
873 socklist[i].outbuf = NULL;
874 socklist[i].outbuflen = 0;
875 } else if (x > 0) {
876 char *p = socklist[i].outbuf;
877
878 /* this removes any sent bytes from the beginning of the buffer */
879 socklist[i].outbuf = (char *) nmalloc(socklist[i].outbuflen - x);
880 my_memcpy(socklist[i].outbuf, p + x, socklist[i].outbuflen - x);
881 socklist[i].outbuflen -= x;
882 nfree(p);
883 }
884 }
885 }
886 }
887
888 /* DEBUGGING STUFF */
889
890 void tell_netdebug(int idx)
891 {
892 int i;
893 char s[80];
894
895 dprintf(idx, "Open sockets:");
896 for (i = 0; i < MAXSOCKS; i++) {
897 if (!(socklist[i].flags & SOCK_UNUSED)) {
898 sprintf(s, " %d", socklist[i].sock);
899 if (socklist[i].flags & SOCK_BINARY)
900 strcat(s, " (binary)");
901 if (socklist[i].flags & SOCK_LISTEN)
902 strcat(s, " (listen)");
903 if (socklist[i].flags & SOCK_CONNECT)
904 strcat(s, " (connecting)");
905 if (socklist[i].flags & SOCK_STRONGCONN)
906 strcat(s, " (strong)");
907 if (socklist[i].flags & SOCK_NONSOCK)
908 strcat(s, " (file)");
909 if (socklist[i].inbuf != NULL)
910 sprintf(&s[strlen(s)], " (inbuf: %04X)", strlen(socklist[i].inbuf));
911 if (socklist[i].outbuf != NULL)
912 sprintf(&s[strlen(s)], " (outbuf: %06lX)", socklist[i].outbuflen);
913 strcat(s, ",");
914 dprintf(idx, "%s", s);
915 }
916 }
917 dprintf(idx, " done.\n");
918 }
919
920 /* Security-flavoured sanity checking on DCC connections of all sorts can be
921 * done with this routine. Feed it the proper information from your DCC
922 * before you attempt the connection, and this will make an attempt at
923 * figuring out if the connection is really that person, or someone screwing
924 * around. It's not foolproof, but anything that fails this check probably
925 * isn't going to work anyway due to masquerading firewalls, NAT routers,
926 * or bugs in mIRC. */
927 int sanitycheck_dcc(char *nick, char *from, char *ipaddy, char *port)
928 {
929 /* According to the latest RFC, the clients SHOULD be able to handle
930 * DNS names that are up to 255 characters long. This is not broken. */
931 char hostname[256], dnsname[256], badaddress[16];
932 IP ip = my_atoul(ipaddy);
933 int prt = atoi(port);
934
935 /* It is disabled HERE so we only have to check in *one* spot! */
936 if (!dcc_sanitycheck)
937 return 1;
938 context; /* This should be pretty solid, but
939 * something _might_ break. */
940 sprintf(badaddress, "%u.%u.%u.%u", (ip >> 24) & 0xff, (ip >> 16) & 0xff,
941 (ip >> 8) & 0xff, ip & 0xff);
942 if (prt < 1) {
943 putlog(LOG_MISC, "*", "ALERT: (%s!%s) specified an impossible port of %u!",
944 nick, from, prt);
945 return 0;
946 }
947 if (ip < (1 << 24)) {
948 putlog(LOG_MISC, "*", "ALERT: (%s!%s) specified an impossible IP of %s!",
949 nick, from, badaddress);
950 return 0;
951 }
952 /* These should pad like crazy with zeros, since 120 bytes or so is
953 * where the routines providing our data currently lose interest. I'm
954 * using the n-variant in case someone changes that... */
955 strncpy(hostname, extracthostname(from), 256);
956 strncpy(dnsname, hostnamefromip(my_htonl(ip)), 256);
957 if (!strcasecmp(hostname, dnsname)) {
958 putlog(LOG_DEBUG, "*", "DNS information for submitted IP checks out.");
959 return 1;
960 }
961 if (!strcmp(badaddress, dnsname))
962 putlog(LOG_MISC, "*", "ALERT: (%s!%s) sent a DCC request with bogus IP information of %s port %u!",
963 nick, from, badaddress, prt);
964 else
965 return 1; /* <- usually happens when we have
966 a user with an unresolved hostmask! */
967 return 0;
968 }

webmaster@eggheads.org
ViewVC Help
Powered by ViewVC 1.1.23