/[cvs]/eggdrop1.9/src/net.c
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Revision 1.37 - (hide annotations) (download) (as text)
Wed Aug 8 14:06:00 2001 UTC (17 years, 10 months ago) by drummer
Branch: MAIN
Changes since 1.36: +8 -38 lines
File MIME type: text/x-chdr
reversing something that should not be there

1 fabian 1.11 /*
2 segfault 1.1 * net.c -- handles:
3 fabian 1.11 * all raw network i/o
4 segfault 1.1 *
5 drummer 1.37 * $Id: net.c,v 1.36 2001/08/08 13:45:48 drummer Exp $
6 fabian 1.11 */
7     /*
8 segfault 1.1 * This is hereby released into the public domain.
9     * Robey Pointer, robey@netcom.com
10     */
11    
12 fabian 1.16 #include <fcntl.h>
13 segfault 1.1 #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 fabian 1.16 # include <sys/select.h>
20 segfault 1.1 #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 fabian 1.16 # include <unistd.h>
26 segfault 1.1 #endif
27     #include <setjmp.h>
28    
29 drummer 1.33 #include "adns/adns.h"
30    
31 segfault 1.1 #if !HAVE_GETDTABLESIZE
32 fabian 1.16 # ifdef FD_SETSIZE
33     # define getdtablesize() FD_SETSIZE
34     # else
35     # define getdtablesize() 200
36     # endif
37 segfault 1.1 #endif
38    
39 drummer 1.33 #ifndef IN6_IS_ADDR_V4MAPPED
40     # define IN6_IS_ADDR_V4MAPPED(a) \
41     ((((uint32_t *) (a))[0] == 0) && (((uint32_t *) (a))[1] == 0) && \
42     (((uint32_t *) (a))[2] == htonl (0xffff)))
43     #endif
44    
45 fabian 1.16 extern struct dcc_t *dcc;
46 guppy 1.28 extern int backgrd, use_stderr, resolve_timeout, dcc_total;
47     extern unsigned long otraffic_irc_today, otraffic_bn_today,
48 fabian 1.16 otraffic_dcc_today, otraffic_filesys_today,
49     otraffic_trans_today, otraffic_unknown_today;
50 drummer 1.33 extern char natip[];
51 fabian 1.16
52     char hostname[121] = ""; /* Hostname can be specified in the config
53     file */
54     char myip[121] = ""; /* IP can be specified in the config file */
55 drummer 1.33 char myip6[121] = ""; /* IP6 can be specified in the config file */
56 fabian 1.16 char firewall[121] = ""; /* Socks server for firewall */
57     int firewallport = 1080; /* Default port of Sock4/5 firewalls */
58     char botuser[21] = "eggdrop"; /* Username of the user running the bot */
59     int dcc_sanitycheck = 0; /* We should do some sanity checking on dcc
60     connections. */
61     sock_list *socklist = NULL; /* Enough to be safe */
62     int MAXSOCKS = 0;
63     jmp_buf alarmret; /* Env buffer for alarm() returns */
64 segfault 1.1
65 drummer 1.33 adns_state ads;
66    
67 fabian 1.16 /* Types of proxy */
68 segfault 1.1 #define PROXY_SOCKS 1
69     #define PROXY_SUN 2
70    
71    
72 fabian 1.16 /* I need an UNSIGNED long for dcc type stuff
73     */
74 segfault 1.1 IP my_atoul(char *s)
75     {
76     IP ret = 0;
77    
78     while ((*s >= '0') && (*s <= '9')) {
79     ret *= 10;
80     ret += ((*s) - '0');
81     s++;
82     }
83     return ret;
84     }
85    
86 fabian 1.16 /* Initialize the socklist
87     */
88 segfault 1.1 void init_net()
89     {
90     int i;
91    
92     for (i = 0; i < MAXSOCKS; i++) {
93     socklist[i].flags = SOCK_UNUSED;
94     }
95 drummer 1.33
96     /* init ADNS */
97     i = adns_init(&ads, adns_if_noautosys, 0);
98     if (i)
99     fatal(adns_strerror(i), 0);
100 segfault 1.1 }
101    
102     int expmem_net()
103     {
104     int i, tot = 0;
105    
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 fabian 1.16 /* Get my ip number
118     */
119 segfault 1.1 IP getmyip()
120     {
121     struct hostent *hp;
122     char s[121];
123     IP ip;
124     struct in_addr *in;
125    
126 fabian 1.16 /* Could be pre-defined */
127 segfault 1.1 if (myip[0]) {
128     if ((myip[strlen(myip) - 1] >= '0') && (myip[strlen(myip) - 1] <= '9'))
129     return (IP) inet_addr(myip);
130     }
131 fabian 1.16 /* Also could be pre-defined */
132 segfault 1.1 if (hostname[0])
133     hp = gethostbyname(hostname);
134     else {
135     gethostname(s, 120);
136     hp = gethostbyname(s);
137     }
138     if (hp == NULL)
139     fatal("Hostname self-lookup failed.", 0);
140     in = (struct in_addr *) (hp->h_addr_list[0]);
141     ip = (IP) (in->s_addr);
142     return ip;
143     }
144    
145 drummer 1.33 #ifdef IPV6
146     struct in6_addr getmyip6()
147     {
148     struct in6_addr ip;
149    
150     /* Could be pre-defined */
151     if (myip6[0])
152     egg_inet_pton(AF_INET6, myip6, &ip);
153     else {
154     /* get system's default IPv6 ip -- FIXME!! */
155     /* there is know way?! - drummer */
156     ip = in6addr_any;
157     }
158     return ip;
159     }
160    
161     struct in6_addr ipv4to6(IP a)
162     {
163     struct in6_addr ip;
164     if (a == INADDR_ANY)
165     return in6addr_any;
166     else {
167     ((uint32_t *)&ip)[0] = 0;
168     ((uint32_t *)&ip)[1] = 0;
169     ((uint16_t *)&ip)[4] = 0;
170     ((uint16_t *)&ip)[5] = 0xffff;
171     ((uint32_t *)&ip)[3] = a;
172     }
173     return ip;
174     }
175    
176     #endif
177    
178 segfault 1.1 void neterror(char *s)
179     {
180     switch (errno) {
181     case EADDRINUSE:
182     strcpy(s, "Address already in use");
183     break;
184     case EADDRNOTAVAIL:
185     strcpy(s, "Address invalid on remote machine");
186     break;
187     case EAFNOSUPPORT:
188     strcpy(s, "Address family not supported");
189     break;
190     case EALREADY:
191     strcpy(s, "Socket already in use");
192     break;
193     case EBADF:
194     strcpy(s, "Socket descriptor is bad");
195     break;
196     case ECONNREFUSED:
197     strcpy(s, "Connection refused");
198     break;
199     case EFAULT:
200     strcpy(s, "Namespace segment violation");
201     break;
202     case EINPROGRESS:
203     strcpy(s, "Operation in progress");
204     break;
205     case EINTR:
206     strcpy(s, "Timeout");
207     break;
208     case EINVAL:
209     strcpy(s, "Invalid namespace");
210     break;
211     case EISCONN:
212     strcpy(s, "Socket already connected");
213     break;
214     case ENETUNREACH:
215     strcpy(s, "Network unreachable");
216     break;
217     case ENOTSOCK:
218     strcpy(s, "File descriptor, not a socket");
219     break;
220     case ETIMEDOUT:
221     strcpy(s, "Connection timed out");
222     break;
223     case ENOTCONN:
224     strcpy(s, "Socket is not connected");
225     break;
226     case EHOSTUNREACH:
227     strcpy(s, "Host is unreachable");
228     break;
229     case EPIPE:
230     strcpy(s, "Broken pipe");
231     break;
232     #ifdef ECONNRESET
233     case ECONNRESET:
234     strcpy(s, "Connection reset by peer");
235     break;
236     #endif
237     #ifdef EACCES
238     case EACCES:
239     strcpy(s, "Permission denied");
240     break;
241     #endif
242     case 0:
243     strcpy(s, "Error 0");
244     break;
245     default:
246     sprintf(s, "Unforseen error %d", errno);
247     break;
248     }
249     }
250    
251 fabian 1.25 /* Sets/Unsets options for a specific socket.
252     *
253     * Returns: 0 - on success
254     * -1 - socket not found
255     * -2 - illegal operation
256     */
257     int sockoptions(int sock, int operation, int sock_options)
258     {
259     int i;
260    
261     for (i = 0; i < MAXSOCKS; i++)
262 poptix 1.30 if ((socklist[i].sock == sock) && !(socklist[i].flags & SOCK_UNUSED)) {
263 fabian 1.25 if (operation == EGG_OPTION_SET)
264     socklist[i].flags |= sock_options;
265     else if (operation == EGG_OPTION_UNSET)
266     socklist[i].flags &= ~sock_options;
267     else
268     return -2;
269     return 0;
270     }
271     return -1;
272     }
273    
274 fabian 1.16 /* Return a free entry in the socket entry
275     */
276 fabian 1.3 int allocsock(int sock, int options)
277 segfault 1.1 {
278     int i;
279    
280     for (i = 0; i < MAXSOCKS; i++) {
281     if (socklist[i].flags & SOCK_UNUSED) {
282     /* yay! there is table space */
283     socklist[i].inbuf = socklist[i].outbuf = NULL;
284 fabian 1.25 socklist[i].inbuflen = socklist[i].outbuflen = 0;
285 segfault 1.1 socklist[i].flags = options;
286     socklist[i].sock = sock;
287 fabian 1.3 return i;
288     }
289     }
290     fatal("Socket table is full!", 0);
291 fabian 1.16 return -1; /* Never reached */
292 fabian 1.3 }
293    
294 fabian 1.16 /* Request a normal socket for i/o
295     */
296 fabian 1.3 void setsock(int sock, int options)
297     {
298     int i = allocsock(sock, options);
299     int parm;
300    
301 fabian 1.16 if (((sock != STDOUT) || backgrd) &&
302     !(socklist[i].flags & SOCK_NONSOCK)) {
303     parm = 1;
304 fabian 1.3 setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (void *) &parm, sizeof(int));
305 segfault 1.1
306 fabian 1.16 parm = 0;
307     setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *) &parm, sizeof(int));
308     }
309     if (options & SOCK_LISTEN) {
310     /* Tris says this lets us grab the same port again next time */
311     parm = 1;
312     setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *) &parm, sizeof(int));
313     }
314     /* Yay async i/o ! */
315     fcntl(sock, F_SETFL, O_NONBLOCK);
316 segfault 1.1 }
317    
318     int getsock(int options)
319     {
320 drummer 1.33 #ifdef IPV6
321     int sock = socket(AF_INET6, SOCK_STREAM, 0);
322     #else
323 segfault 1.1 int sock = socket(AF_INET, SOCK_STREAM, 0);
324 drummer 1.33 #endif
325 segfault 1.1
326 fabian 1.24 if (sock >= 0)
327     setsock(sock, options);
328     else
329     putlog(LOG_MISC, "*", "Warning: Can't create new socket!");
330 segfault 1.1 return sock;
331     }
332    
333 fabian 1.16 /* Done with a socket
334     */
335 fabian 1.24 void killsock(register int sock)
336 segfault 1.1 {
337 fabian 1.24 register int i;
338 segfault 1.1
339 fabian 1.24 /* Ignore invalid sockets. */
340     if (sock < 0)
341     return;
342 segfault 1.1 for (i = 0; i < MAXSOCKS; i++) {
343 fabian 1.2 if ((socklist[i].sock == sock) && !(socklist[i].flags & SOCK_UNUSED)) {
344 segfault 1.1 close(socklist[i].sock);
345     if (socklist[i].inbuf != NULL) {
346     nfree(socklist[i].inbuf);
347     socklist[i].inbuf = NULL;
348     }
349     if (socklist[i].outbuf != NULL) {
350     nfree(socklist[i].outbuf);
351     socklist[i].outbuf = NULL;
352     socklist[i].outbuflen = 0;
353     }
354     socklist[i].flags = SOCK_UNUSED;
355     return;
356     }
357     }
358     putlog(LOG_MISC, "*", "Attempt to kill un-allocated socket %d !!", sock);
359     }
360    
361 fabian 1.16 /* Send connection request to proxy
362     */
363 segfault 1.1 static int proxy_connect(int sock, char *host, int port, int proxy)
364     {
365     unsigned char x[10];
366     struct hostent *hp;
367 fabian 1.26 char s[256];
368 segfault 1.1 int i;
369    
370     /* socks proxy */
371     if (proxy == PROXY_SOCKS) {
372     /* numeric IP? */
373 fabian 1.26 if (host[strlen(host) - 1] >= '0' && host[strlen(host) - 1] <= '9') {
374 segfault 1.1 IP ip = ((IP) inet_addr(host)); /* drummer */
375 fabian 1.18 egg_memcpy(x, &ip, 4); /* Beige@Efnet */
376 segfault 1.1 } else {
377     /* no, must be host.domain */
378     if (!setjmp(alarmret)) {
379     alarm(resolve_timeout);
380     hp = gethostbyname(host);
381     alarm(0);
382     } else {
383     hp = NULL;
384     }
385     if (hp == NULL) {
386     killsock(sock);
387     return -2;
388     }
389 fabian 1.18 egg_memcpy(x, hp->h_addr, hp->h_length);
390 segfault 1.1 }
391 drummer 1.37 for (i = 0; i < MAXSOCKS; i++)
392     if (!(socklist[i].flags & SOCK_UNUSED) && socklist[i].sock == sock)
393     socklist[i].flags |= SOCK_PROXYWAIT; /* drummer */
394 fabian 1.26 egg_snprintf(s, sizeof s, "\004\001%c%c%c%c%c%c%s", (port >> 8) % 256,
395     (port % 256), x[0], x[1], x[2], x[3], botuser);
396 segfault 1.1 tputs(sock, s, strlen(botuser) + 9); /* drummer */
397     } else if (proxy == PROXY_SUN) {
398 drummer 1.37 egg_snprintf(s, sizeof s, "%s %d\n", host, port);
399 segfault 1.1 tputs(sock, s, strlen(s)); /* drummer */
400     }
401     return sock;
402     }
403    
404 fabian 1.16 /* Starts a connection attempt to a socket
405 fabian 1.11 *
406 fabian 1.3 * If given a normal hostname, this will be resolved to the corresponding
407     * IP address first. PLEASE try to use the non-blocking dns functions
408     * instead and then call this function with the IP address to avoid blocking.
409 fabian 1.11 *
410 segfault 1.1 * returns <0 if connection refused:
411     * -1 neterror() type error
412 fabian 1.16 * -2 can't resolve hostname
413     */
414 segfault 1.1 int open_telnet_raw(int sock, char *server, int sport)
415     {
416 drummer 1.33 #ifdef IPV6
417     struct sockaddr_in6 name, vname;
418     #else
419     struct sockaddr_in name, vname;
420     #endif
421 segfault 1.1 struct hostent *hp;
422     char host[121];
423     int i, port;
424     volatile int proxy;
425    
426 drummer 1.33 debug2("|NET| open_telnet_raw: %s %d", server, sport);
427    
428 segfault 1.1 /* firewall? use socks */
429     if (firewall[0]) {
430     if (firewall[0] == '!') {
431     proxy = PROXY_SUN;
432     strcpy(host, &firewall[1]);
433     } else {
434     proxy = PROXY_SOCKS;
435     strcpy(host, firewall);
436     }
437     port = firewallport;
438     } else {
439     proxy = 0;
440     strcpy(host, server);
441     port = sport;
442     }
443    
444 drummer 1.33 egg_bzero((char *) &name, sizeof name);
445     #ifdef IPV6
446     name.sin6_family = AF_INET6;
447     name.sin6_port = htons(port);
448     #else
449 segfault 1.1 name.sin_family = AF_INET;
450 drummer 1.33 name.sin_port = htons(port);
451     #endif
452    
453     if (!setjmp(alarmret)) {
454     char *p;
455     int type;
456    
457     alarm(resolve_timeout);
458 segfault 1.1
459 drummer 1.33 if (!egg_strncasecmp("ipv6%", host, 5)) {
460     type = AF_INET6;
461     p = host + 5;
462     debug1("|NET| checking only AAAA record for %s", p);
463     } else if (!egg_strncasecmp("ipv4%", host, 5)) {
464     type = AF_INET;
465     p = host + 5;
466     debug1("|NET| checking only A record for %s", p);
467     } else {
468     type = AF_INET; /* af_preferred */
469     p = host;
470     }
471 segfault 1.1 alarm(resolve_timeout);
472 drummer 1.33 #ifndef IPV6
473     hp = gethostbyname(p);
474     #else
475     hp = gethostbyname2(p, type);
476     if (!hp && (p == host))
477     hp = gethostbyname2(p, (type == AF_INET6 ? AF_INET : AF_INET6));
478     #endif
479 segfault 1.1 alarm(0);
480 drummer 1.33 } else {
481 segfault 1.1 hp = NULL;
482 drummer 1.33 }
483     if (hp == NULL)
484 segfault 1.1 return -2;
485 drummer 1.33
486     #ifndef IPV6
487     egg_memcpy(&name.sin_addr, hp->h_addr, hp->h_length);
488     name.sin_family = hp->h_addrtype;
489     #else
490     if (hp->h_addrtype == AF_INET6)
491     egg_memcpy(&name.sin6_addr, hp->h_addr, hp->h_length);
492     else if (hp->h_addrtype == AF_INET)
493     name.sin6_addr = ipv4to6(*((unsigned int*) hp->h_addr));
494     else
495     return -123; /* panic :P */
496     name.sin6_family = AF_INET6;
497     #endif
498    
499     egg_bzero((char *) &vname, sizeof vname);
500     #ifndef IPV6
501     vname.sin_family = AF_INET;
502     vname.sin_addr.s_addr = (myip[0] ? getmyip() : INADDR_ANY);
503     #else
504     vname.sin6_family = AF_INET6;
505 drummer 1.35 if (IN6_IS_ADDR_V4MAPPED(&name.sin6_addr))
506 drummer 1.33 vname.sin6_addr = ipv4to6(myip[0] ? getmyip() : INADDR_ANY);
507     else
508     vname.sin6_addr = (myip6[0] ? getmyip6() : in6addr_any);
509     #endif
510     if (bind(sock, (struct sockaddr *) &vname, sizeof vname) < 0)
511     return -1;
512    
513 segfault 1.1 for (i = 0; i < MAXSOCKS; i++) {
514     if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].sock == sock))
515 fabian 1.17 socklist[i].flags = (socklist[i].flags & ~SOCK_VIRTUAL) | SOCK_CONNECT;
516 segfault 1.1 }
517 drummer 1.33 if (connect(sock, (struct sockaddr *) &name, (sizeof name)) < 0) {
518 segfault 1.1 if (errno == EINPROGRESS) {
519 fabian 1.16 /* Firewall? announce connect attempt to proxy */
520 segfault 1.1 if (firewall[0])
521     return proxy_connect(sock, server, sport, proxy);
522     return sock; /* async success! */
523 fabian 1.4 } else
524 segfault 1.1 return -1;
525     }
526 fabian 1.16 /* Synchronous? :/ */
527 segfault 1.1 if (firewall[0])
528     return proxy_connect(sock, server, sport, proxy);
529     return sock;
530     }
531    
532 fabian 1.16 /* Ordinary non-binary connection attempt */
533 segfault 1.1 int open_telnet(char *server, int port)
534     {
535 fabian 1.4 int sock = getsock(0),
536     ret = open_telnet_raw(sock, server, port);
537    
538     if (ret < 0)
539     killsock(sock);
540     return ret;
541 segfault 1.1 }
542    
543 fabian 1.16 /* Returns a socket number for a listening socket that will accept any
544 fabian 1.19 * connection on a certain address -- port # is returned in port
545 drummer 1.33 * "" means on any address
546 fabian 1.16 */
547 drummer 1.33 int open_address_listen(char *addr, int *port)
548 segfault 1.1 {
549 fabian 1.13 int sock;
550     unsigned int addrlen;
551 drummer 1.33 #ifdef IPV6
552     struct sockaddr_in6 name;
553     #else
554 segfault 1.1 struct sockaddr_in name;
555 drummer 1.33 #endif
556 segfault 1.1
557     if (firewall[0]) {
558     /* FIXME: can't do listen port thru firewall yet */
559 fabian 1.6 putlog(LOG_MISC, "*", "!! Cant open a listen port (you are using a firewall)");
560 segfault 1.1 return -1;
561     }
562 fabian 1.24
563 segfault 1.1 sock = getsock(SOCK_LISTEN);
564 fabian 1.24 if (sock < 1)
565     return -1;
566 drummer 1.33
567     debug2("|NET| open_address_listen(\"%s\", %d)", addr, *port);
568 fabian 1.24
569 drummer 1.33 egg_bzero((char *) &name, sizeof name);
570     #ifdef IPV6
571     name.sin6_family = AF_INET6;
572     name.sin6_port = htons(*port); /* 0 = just assign us a port */
573     if (!addr[0])
574     name.sin6_addr = in6addr_any;
575     else if (!egg_inet_pton(AF_INET6, addr, &name.sin6_addr)) {
576     struct in_addr a4;
577     if (egg_inet_aton(addr, &a4))
578     name.sin6_addr = ipv4to6(a4.s_addr);
579     else
580     name.sin6_addr = in6addr_any;
581     }
582     #else
583 segfault 1.1 name.sin_family = AF_INET;
584 fabian 1.19 name.sin_port = htons(*port); /* 0 = just assign us a port */
585 drummer 1.33 if (addr[0])
586     egg_inet_aton(addr, &name.sin_addr);
587     else
588     name.sin_addr.s_addr = INADDR_ANY;
589     #endif
590     if (bind(sock, (struct sockaddr *) &name, sizeof name) < 0) {
591 segfault 1.1 killsock(sock);
592 guppy 1.29 if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT)
593     return -2;
594     else
595     return -1;
596 segfault 1.1 }
597     /* what port are we on? */
598 drummer 1.33 addrlen = sizeof name;
599 segfault 1.1 if (getsockname(sock, (struct sockaddr *) &name, &addrlen) < 0) {
600     killsock(sock);
601     return -1;
602     }
603 drummer 1.33 #ifdef IPV6
604     *port = ntohs(name.sin6_port);
605     #else
606 fabian 1.19 *port = ntohs(name.sin_port);
607 drummer 1.33 #endif
608 segfault 1.1 if (listen(sock, 1) < 0) {
609     killsock(sock);
610     return -1;
611     }
612     return sock;
613 fabian 1.19 }
614    
615     /* Returns a socket number for a listening socket that will accept any
616     * connection -- port # is returned in port
617     */
618 drummer 1.33 inline int open_listen(int *port, int af)
619 fabian 1.19 {
620 drummer 1.33 if (af == AF_INET)
621     return open_address_listen(myip, port);
622     #ifdef IPV6
623     else if (af == AF_INET6)
624     return open_address_listen(myip6, port);
625     #endif
626     else
627     return -1;
628 segfault 1.1 }
629    
630 fabian 1.3 /* Given a network-style IP address, returns the hostname. The hostname
631     * will be in the "##.##.##.##" format if there was an error.
632     *
633     * NOTE: This function is depreciated. Try using the async dns approach
634 fabian 1.16 * instead.
635     */
636 segfault 1.1 char *hostnamefromip(unsigned long ip)
637     {
638     struct hostent *hp;
639     unsigned long addr = ip;
640     unsigned char *p;
641 fabian 1.3 static char s[UHOSTLEN];
642 segfault 1.1
643     if (!setjmp(alarmret)) {
644     alarm(resolve_timeout);
645     hp = gethostbyaddr((char *) &addr, sizeof(addr), AF_INET);
646     alarm(0);
647     } else {
648     hp = NULL;
649     }
650     if (hp == NULL) {
651     p = (unsigned char *) &addr;
652     sprintf(s, "%u.%u.%u.%u", p[0], p[1], p[2], p[3]);
653     return s;
654     }
655 guppy 1.27 strncpyz(s, hp->h_name, sizeof s);
656 segfault 1.1 return s;
657     }
658    
659 fabian 1.5 /* Returns the given network byte order IP address in the
660 fabian 1.16 * dotted format - "##.##.##.##"
661 drummer 1.33 * (it's IPv4 only, and it's okey - drummer)
662 fabian 1.16 */
663 fabian 1.3 char *iptostr(IP ip)
664     {
665     struct in_addr a;
666    
667     a.s_addr = ip;
668     return inet_ntoa(a);
669     }
670    
671 drummer 1.33 char *getlocaladdr(int sock)
672     {
673     static char buf[ADDRLEN];
674     #ifdef IPV6
675     struct sockaddr_in6 sa;
676     #else
677     struct sockaddr_in sa;
678     #endif
679     int len = sizeof sa;
680    
681     if (sock == -1) { /* assuming IPv4... */
682     sprintf(buf, "%lu", (unsigned long int)
683     ntohl(natip[0] ? inet_addr(natip) : getmyip()));
684     return buf;
685     }
686    
687     if (getsockname(sock, (struct sockaddr*) &sa, &len) == -1) {
688     debug1("|NET| getsockname() failed for sock %d", sock);
689     return 0;
690     }
691     #ifdef IPV6
692     if (IN6_IS_ADDR_V4MAPPED(&sa.sin6_addr))
693     sprintf(buf, "%lu",
694 drummer 1.34 (unsigned long int) ntohl(((uint32_t *)&sa.sin6_addr)[3]));
695 drummer 1.33 else
696     egg_inet_ntop(AF_INET6, &(sa.sin6_addr), buf, sizeof buf);
697     #else
698 drummer 1.36 sprintf(buf, "%lu", (unsigned long int) ntohl(sa.sin_addr.s_addr));
699 drummer 1.33 #endif
700     return buf;
701     }
702    
703 fabian 1.16 /* Short routine to answer a connect received on a socket made previously
704 segfault 1.1 * by open_listen ... returns hostname of the caller & the new socket
705 fabian 1.16 * does NOT dispose of old "public" socket!
706     */
707 drummer 1.33 int answer(int sock, char *caller, char *ip, unsigned short *port,
708 fabian 1.16 int binary)
709 segfault 1.1 {
710 fabian 1.13 int new_sock;
711     unsigned int addrlen;
712 drummer 1.33 #ifdef IPV6
713     struct sockaddr_in6 from;
714     #else
715 segfault 1.1 struct sockaddr_in from;
716 drummer 1.33 #endif
717 fabian 1.25
718 drummer 1.33 addrlen = sizeof from;
719 segfault 1.1 new_sock = accept(sock, (struct sockaddr *) &from, &addrlen);
720     if (new_sock < 0)
721     return -1;
722     if (ip != NULL) {
723 drummer 1.33 #ifdef IPV6
724 drummer 1.35 if (IN6_IS_ADDR_V4MAPPED(&from.sin6_addr))
725 drummer 1.34 egg_inet_ntop(AF_INET, &(((uint32_t *)&from.sin6_addr)[3]), ip, ADDRMAX);
726 drummer 1.33 else
727     egg_inet_ntop(AF_INET6, &(from.sin6_addr), ip, ADDRMAX);
728     #else
729     egg_inet_ntop(AF_INET, &(from.sin_addr.s_addr), ip, ADDRMAX);
730     #endif
731 fabian 1.16 /* This is now done asynchronously. We now only provide the IP address.
732     *
733 fabian 1.3 * strncpy(caller, hostnamefromip(*ip), 120);
734     */
735 drummer 1.33 strncpyz(caller, ip, 121);
736 segfault 1.1 }
737     if (port != NULL)
738 drummer 1.33 #ifdef IPV6
739     *port = ntohs(from.sin6_port);
740     #else
741 fabian 1.21 *port = ntohs(from.sin_port);
742 drummer 1.33 #endif
743 fabian 1.16 /* Set up all the normal socket crap */
744 segfault 1.1 setsock(new_sock, (binary ? SOCK_BINARY : 0));
745     return new_sock;
746     }
747    
748 fabian 1.16 /* Like open_telnet, but uses server & port specifications of dcc
749     */
750 segfault 1.1 int open_telnet_dcc(int sock, char *server, char *port)
751     {
752     int p;
753 drummer 1.33 struct in_addr ia;
754 segfault 1.1
755 drummer 1.33 debug2("|NET| open_telnet_dcc: %s %s", server, port);
756 segfault 1.1 if (port != NULL)
757     p = atoi(port);
758     else
759 drummer 1.33 return -3;
760     if (server == NULL)
761     return -3;
762     /* fix the IPv4 IP format (ie: 167772161 -> 10.0.0.1) */
763     if (egg_inet_aton(server, &ia))
764     return open_telnet_raw(sock, inet_ntoa(ia), p);
765 segfault 1.1 else
766 drummer 1.33 return open_telnet_raw(sock, server, p);
767     }
768    
769     void egg_dns_gotanswer(int status, adns_answer *aw, char *origname)
770     {
771     char name[UHOSTLEN];
772    
773     if (!aw) {
774     debug0("|DNS| egg_dns_gotanswer: ANSWER IS NULL!");
775     return;
776     }
777     if (!origname) {
778     debug0("|DNS| egg_dns_gotanswer: origname is NULL!");
779     return;
780     }
781    
782     debug2("|DNS| egg_dns_gotanswer: status=%d adns_answer=%x", status, (int)aw);
783     status = 0;
784     if ((aw->type == adns_r_addr)
785     #ifdef IPV6
786     || (aw->type == adns_r_addr6)
787     #endif
788     ) {
789     if ((aw->status == adns_s_ok) && (aw->nrrs > 0)) {
790     adns_rr_addr *rrp = aw->rrs.untyped;
791     if (rrp->addr.sa.sa_family == AF_INET) {
792     egg_inet_ntop(AF_INET, &(rrp->addr.inet.sin_addr), name, UHOSTLEN-1);
793     status = 1;
794     #ifdef IPV6
795     } else if (rrp->addr.sa.sa_family == AF_INET6) {
796     egg_inet_ntop(AF_INET6, &(rrp->addr.inet6.sin6_addr), name, UHOSTLEN-1);
797     status = 1;
798     #endif
799     }
800     #ifdef IPV6
801     } else if ((aw->type == adns_r_addr /* af_preferred */) &&
802     egg_strncasecmp(origname, "ipv6%", 5) &&
803     egg_strncasecmp(origname, "ipv4%", 5)) {
804     adns_query q6;
805     char *orign2 = (char*) nmalloc(strlen(origname) + 1);
806     strcpy(orign2, origname);
807     /* ...it may be AAAA */
808     debug1("|DNS| egg_dns_gotanswer: A failed, checking for AAAA (%s)", origname);
809     adns_submit(ads, origname, adns_r_addr6, 0, orign2, &q6);
810     status = -1;
811     #endif
812     }
813     if (status == 0)
814     strcpy(name, "0.0.0.0");
815     if (status >= 0) {
816     debug3("|DNS| egg_dns_gotanswer: (ipbyhost) host: %s ip: %s status: %d", origname, name, status);
817     call_ipbyhost(origname, name, status);
818     }
819     } else if ((aw->type == adns_r_ptr_ip6) || (aw->type == adns_r_ptr)) {
820     if ((aw->status == adns_s_ok) && (aw->nrrs > 0)) {
821     if (aw->rrs.str) {
822     strncpyz(name, *(aw->rrs.str), UHOSTLEN);
823     status = 1;
824     }
825     }
826     if (!status) {
827     if (origname)
828     strncpyz(name, origname, UHOSTLEN);
829     else
830     strcpy(name, "error");
831     }
832     debug3("|DNS| egg_dns_gotanswer: (hostbyip) ip: %s host: %s status: %d", origname, name, status);
833     call_hostbyip(origname, name, status);
834     } else
835     debug0("|DNS| egg_dns_gotanswer: got unknow type of answer ?!");
836     nfree(origname);
837     }
838    
839     void egg_dns_checkall()
840     {
841     adns_query q, r;
842     adns_answer *answer;
843     char *origname;
844    
845     adns_forallqueries_begin(ads);
846     while ((q = adns_forallqueries_next(ads, (void **)&r)) != NULL) {
847     switch (adns_check(ads, &q, &answer, (void **)&origname)) {
848     case 0: /* ok */
849     egg_dns_gotanswer(1, answer, origname);
850     break;
851     case EAGAIN: /* Go into the queue again */
852     break;
853     default: /* failed */
854     egg_dns_gotanswer(0, answer, origname);
855     break;
856     }
857     }
858 segfault 1.1 }
859    
860 fabian 1.16 /* Attempts to read from all the sockets in socklist
861 segfault 1.1 * fills s with up to 511 bytes if available, and returns the array index
862 fabian 1.16 *
863     * on EOF: returns -1, with socket in len
864     * on socket error: returns -2
865     * if nothing is ready: returns -3
866     */
867 segfault 1.1 static int sockread(char *s, int *len)
868     {
869 drummer 1.33 fd_set fd, fdw, fde;
870 segfault 1.1 int fds, i, x;
871 drummer 1.33 struct timeval t, tnow;
872     struct timeval *pt = &t;
873 segfault 1.1 int grab = 511;
874    
875     fds = getdtablesize();
876     #ifdef FD_SETSIZE
877     if (fds > FD_SETSIZE)
878 fabian 1.16 fds = FD_SETSIZE; /* Fixes YET ANOTHER freebsd bug!!! */
879 segfault 1.1 #endif
880     /* timeout: 1 sec */
881     t.tv_sec = 1;
882     t.tv_usec = 0;
883     FD_ZERO(&fd);
884 fabian 1.17
885 segfault 1.1 for (i = 0; i < MAXSOCKS; i++)
886 fabian 1.17 if (!(socklist[i].flags & (SOCK_UNUSED | SOCK_VIRTUAL))) {
887 segfault 1.1 if ((socklist[i].sock == STDOUT) && !backgrd)
888     FD_SET(STDIN, &fd);
889     else
890     FD_SET(socklist[i].sock, &fd);
891     }
892 drummer 1.33 tnow.tv_sec = time(NULL);
893     tnow.tv_usec = 0;
894     adns_beforeselect(ads, &fds, &fd, &fdw, &fde, &pt, 0, &tnow);
895 segfault 1.1 #ifdef HPUX_HACKS
896     #ifndef HPUX10_HACKS
897     x = select(fds, (int *) &fd, (int *) NULL, (int *) NULL, &t);
898     #else
899     x = select(fds, &fd, NULL, NULL, &t);
900     #endif
901     #else
902     x = select(fds, &fd, NULL, NULL, &t);
903     #endif
904 drummer 1.33 tnow.tv_sec = time(NULL);
905     tnow.tv_usec = 0;
906     adns_afterselect(ads, fds, &fd, &fdw, &fde, &tnow);
907    
908     /* dns stuff */
909     egg_dns_checkall();
910    
911 segfault 1.1 if (x > 0) {
912 fabian 1.16 /* Something happened */
913 segfault 1.1 for (i = 0; i < MAXSOCKS; i++) {
914     if ((!(socklist[i].flags & SOCK_UNUSED)) &&
915     ((FD_ISSET(socklist[i].sock, &fd)) ||
916     ((socklist[i].sock == STDOUT) && (!backgrd) &&
917     (FD_ISSET(STDIN, &fd))))) {
918     if (socklist[i].flags & (SOCK_LISTEN | SOCK_CONNECT)) {
919 fabian 1.16 /* Listening socket -- don't read, just return activity */
920     /* Same for connection attempt */
921 segfault 1.1 /* (for strong connections, require a read to succeed first) */
922     if (socklist[i].flags & SOCK_PROXYWAIT) { /* drummer */
923 fabian 1.16 /* Hang around to get the return code from proxy */
924 segfault 1.1 grab = 10;
925     } else if (!(socklist[i].flags & SOCK_STRONGCONN)) {
926     debug1("net: connect! sock %d", socklist[i].sock);
927     s[0] = 0;
928     *len = 0;
929     return i;
930     }
931 fabian 1.3 } else if (socklist[i].flags & SOCK_PASS) {
932     s[0] = 0;
933     *len = 0;
934     return i;
935 segfault 1.1 }
936     if ((socklist[i].sock == STDOUT) && !backgrd)
937     x = read(STDIN, s, grab);
938     else
939     x = read(socklist[i].sock, s, grab);
940     if (x <= 0) { /* eof */
941 guppy 1.31 if (errno == EAGAIN) {
942 segfault 1.1 s[0] = 0;
943     *len = 0;
944     return -3;
945     }
946     *len = socklist[i].sock;
947     socklist[i].flags &= ~SOCK_CONNECT;
948     debug1("net: eof!(read) socket %d", socklist[i].sock);
949     return -1;
950     }
951     s[x] = 0;
952     *len = x;
953     if (socklist[i].flags & SOCK_PROXYWAIT) {
954     debug2("net: socket: %d proxy errno: %d", socklist[i].sock, s[1]);
955     socklist[i].flags &= ~(SOCK_CONNECT | SOCK_PROXYWAIT);
956     switch (s[1]) {
957 fabian 1.16 case 90: /* Success */
958 segfault 1.1 s[0] = 0;
959     *len = 0;
960     return i;
961 fabian 1.16 case 91: /* Failed */
962 segfault 1.1 errno = ECONNREFUSED;
963     break;
964 fabian 1.16 case 92: /* No identd */
965     case 93: /* Identd said wrong username */
966     /* A better error message would be "socks misconfigured"
967     * or "identd not working" but this is simplest.
968     */
969 segfault 1.1 errno = ENETUNREACH;
970     break;
971     }
972     *len = socklist[i].sock;
973     return -1;
974     }
975     return i;
976     }
977     }
978     } else if (x == -1)
979     return -2; /* socket error */
980     else {
981     s[0] = 0;
982     *len = 0;
983     }
984     return -3;
985     }
986    
987     /* sockgets: buffer and read from sockets
988     *
989 fabian 1.16 * Attempts to read from all registered sockets for up to one second. if
990 segfault 1.1 * after one second, no complete data has been received from any of the
991     * sockets, 's' will be empty, 'len' will be 0, and sockgets will return -3.
992     * if there is returnable data received from a socket, the data will be
993     * in 's' (null-terminated if non-binary), the length will be returned
994     * in len, and the socket number will be returned.
995     * normal sockets have their input buffered, and each call to sockgets
996     * will return one line terminated with a '\n'. binary sockets are not
997     * buffered and return whatever coems in as soon as it arrives.
998     * listening sockets will return an empty string when a connection comes in.
999     * connecting sockets will return an empty string on a successful connect,
1000     * or EOF on a failed connect.
1001     * if an EOF is detected from any of the sockets, that socket number will be
1002     * put in len, and -1 will be returned.
1003     * the maximum length of the string returned is 512 (including null)
1004 fabian 1.25 *
1005     * Returns -4 if we handled something that shouldn't be handled by the
1006     * dcc functions. Simply ignore it.
1007 segfault 1.1 */
1008    
1009     int sockgets(char *s, int *len)
1010     {
1011     char xx[514], *p, *px;
1012     int ret, i, data = 0;
1013    
1014     for (i = 0; i < MAXSOCKS; i++) {
1015 fabian 1.16 /* Check for stored-up data waiting to be processed */
1016 fabian 1.25 if (!(socklist[i].flags & SOCK_UNUSED) &&
1017     !(socklist[i].flags & SOCK_BUFFER) && (socklist[i].inbuf != NULL)) {
1018     if (!(socklist[i].flags & SOCK_BINARY)) {
1019     /* look for \r too cos windows can't follow RFCs */
1020     p = strchr(socklist[i].inbuf, '\n');
1021     if (p == NULL)
1022     p = strchr(socklist[i].inbuf, '\r');
1023     if (p != NULL) {
1024     *p = 0;
1025     if (strlen(socklist[i].inbuf) > 510)
1026     socklist[i].inbuf[510] = 0;
1027     strcpy(s, socklist[i].inbuf);
1028     px = (char *) nmalloc(strlen(p + 1) + 1);
1029     strcpy(px, p + 1);
1030     nfree(socklist[i].inbuf);
1031     if (px[0])
1032     socklist[i].inbuf = px;
1033     else {
1034     nfree(px);
1035     socklist[i].inbuf = NULL;
1036     }
1037     /* Strip CR if this was CR/LF combo */
1038     if (s[strlen(s) - 1] == '\r')
1039     s[strlen(s) - 1] = 0;
1040     *len = strlen(s);
1041     return socklist[i].sock;
1042     }
1043     } else {
1044     /* Handling buffered binary data (must have been SOCK_BUFFER before). */
1045     if (socklist[i].inbuflen <= 510) {
1046     *len = socklist[i].inbuflen;
1047     egg_memcpy(s, socklist[i].inbuf, socklist[i].inbuflen);
1048     nfree(socklist[i].inbuf);
1049 poptix 1.30 socklist[i].inbuf = NULL;
1050 fabian 1.25 socklist[i].inbuflen = 0;
1051     } else {
1052     /* Split up into chunks of 510 bytes. */
1053     *len = 510;
1054     egg_memcpy(s, socklist[i].inbuf, *len);
1055     egg_memcpy(socklist[i].inbuf, socklist[i].inbuf + *len, *len);
1056     socklist[i].inbuflen -= *len;
1057     socklist[i].inbuf = nrealloc(socklist[i].inbuf,
1058     socklist[i].inbuflen);
1059 segfault 1.1 }
1060     return socklist[i].sock;
1061     }
1062     }
1063 fabian 1.16 /* Also check any sockets that might have EOF'd during write */
1064 segfault 1.1 if (!(socklist[i].flags & SOCK_UNUSED)
1065     && (socklist[i].flags & SOCK_EOFD)) {
1066     s[0] = 0;
1067     *len = socklist[i].sock;
1068     return -1;
1069     }
1070     }
1071 fabian 1.16 /* No pent-up data of any worth -- down to business */
1072 segfault 1.1 *len = 0;
1073     ret = sockread(xx, len);
1074     if (ret < 0) {
1075     s[0] = 0;
1076     return ret;
1077     }
1078 fabian 1.16 /* Binary, listening and passed on sockets don't get buffered. */
1079 segfault 1.1 if (socklist[ret].flags & SOCK_CONNECT) {
1080     if (socklist[ret].flags & SOCK_STRONGCONN) {
1081     socklist[ret].flags &= ~SOCK_STRONGCONN;
1082 fabian 1.25 /* Buffer any data that came in, for future read. */
1083     socklist[ret].inbuflen = *len;
1084     socklist[ret].inbuf = (char *) nmalloc(*len + 1);
1085     /* It might be binary data. You never know. */
1086     egg_memcpy(socklist[ret].inbuf, xx, *len);
1087     socklist[ret].inbuf[*len] = 0;
1088 segfault 1.1 }
1089     socklist[ret].flags &= ~SOCK_CONNECT;
1090     s[0] = 0;
1091     return socklist[ret].sock;
1092     }
1093     if (socklist[ret].flags & SOCK_BINARY) {
1094 fabian 1.18 egg_memcpy(s, xx, *len);
1095 segfault 1.1 return socklist[ret].sock;
1096     }
1097 fabian 1.3 if ((socklist[ret].flags & SOCK_LISTEN) ||
1098     (socklist[ret].flags & SOCK_PASS))
1099 segfault 1.1 return socklist[ret].sock;
1100 fabian 1.25 if (socklist[ret].flags & SOCK_BUFFER) {
1101     socklist[ret].inbuf = (char *) nrealloc(socklist[ret].inbuf,
1102     socklist[ret].inbuflen + *len + 1);
1103     egg_memcpy(socklist[ret].inbuf + socklist[ret].inbuflen, xx, *len);
1104     socklist[ret].inbuflen += *len;
1105     /* We don't know whether it's binary data. Make sure normal strings
1106     will be handled properly later on too. */
1107     socklist[ret].inbuf[socklist[ret].inbuflen] = 0;
1108     return -4; /* Ignore this one. */
1109     }
1110 fabian 1.16 /* Might be necessary to prepend stored-up data! */
1111 segfault 1.1 if (socklist[ret].inbuf != NULL) {
1112     p = socklist[ret].inbuf;
1113     socklist[ret].inbuf = (char *) nmalloc(strlen(p) + strlen(xx) + 1);
1114     strcpy(socklist[ret].inbuf, p);
1115     strcat(socklist[ret].inbuf, xx);
1116     nfree(p);
1117     if (strlen(socklist[ret].inbuf) < 512) {
1118     strcpy(xx, socklist[ret].inbuf);
1119     nfree(socklist[ret].inbuf);
1120     socklist[ret].inbuf = NULL;
1121 fabian 1.25 socklist[ret].inbuflen = 0;
1122 segfault 1.1 } else {
1123     p = socklist[ret].inbuf;
1124 fabian 1.25 socklist[ret].inbuflen = strlen(p) - 510;
1125     socklist[ret].inbuf = (char *) nmalloc(socklist[ret].inbuflen + 1);
1126 segfault 1.1 strcpy(socklist[ret].inbuf, p + 510);
1127     *(p + 510) = 0;
1128     strcpy(xx, p);
1129     nfree(p);
1130     /* (leave the rest to be post-pended later) */
1131     }
1132     }
1133 fabian 1.16 /* Look for EOL marker; if it's there, i have something to show */
1134 segfault 1.1 p = strchr(xx, '\n');
1135     if (p == NULL)
1136     p = strchr(xx, '\r');
1137     if (p != NULL) {
1138     *p = 0;
1139     strcpy(s, xx);
1140     strcpy(xx, p + 1);
1141     if (s[strlen(s) - 1] == '\r')
1142     s[strlen(s) - 1] = 0;
1143     data = 1; /* DCC_CHAT may now need to process a
1144 fabian 1.16 blank line */
1145 segfault 1.1 /* NO! */
1146     /* if (!s[0]) strcpy(s," "); */
1147     } else {
1148     s[0] = 0;
1149     if (strlen(xx) >= 510) {
1150 fabian 1.16 /* String is too long, so just insert fake \n */
1151 segfault 1.1 strcpy(s, xx);
1152     xx[0] = 0;
1153     data = 1;
1154     }
1155     }
1156     *len = strlen(s);
1157 fabian 1.16 /* Anything left that needs to be saved? */
1158 segfault 1.1 if (!xx[0]) {
1159     if (data)
1160     return socklist[ret].sock;
1161     else
1162     return -3;
1163     }
1164 fabian 1.16 /* Prepend old data back */
1165 segfault 1.1 if (socklist[ret].inbuf != NULL) {
1166     p = socklist[ret].inbuf;
1167 fabian 1.25 socklist[ret].inbuflen = strlen(p) + strlen(xx);
1168     socklist[ret].inbuf = (char *) nmalloc(socklist[ret].inbuflen + 1);
1169 segfault 1.1 strcpy(socklist[ret].inbuf, xx);
1170     strcat(socklist[ret].inbuf, p);
1171     nfree(p);
1172     } else {
1173 fabian 1.25 socklist[ret].inbuflen = strlen(xx);
1174     socklist[ret].inbuf = (char *) nmalloc(socklist[ret].inbuflen + 1);
1175 segfault 1.1 strcpy(socklist[ret].inbuf, xx);
1176     }
1177     if (data) {
1178     return socklist[ret].sock;
1179     } else {
1180     return -3;
1181     }
1182     }
1183    
1184 fabian 1.16 /* Dump something to a socket
1185     *
1186     * NOTE: Do NOT put Contexts in here if you want DEBUG to be meaningful!!
1187     */
1188 fabian 1.12 void tputs(register int z, char *s, unsigned int len)
1189 segfault 1.1 {
1190 fabian 1.12 register int i, x, idx;
1191 segfault 1.1 char *p;
1192 fabian 1.12 static int inhere = 0;
1193 segfault 1.1
1194     if (z < 0)
1195     return; /* um... HELLO?! sanity check please! */
1196     if (((z == STDOUT) || (z == STDERR)) && (!backgrd || use_stderr)) {
1197     write(z, s, len);
1198     return;
1199     }
1200     for (i = 0; i < MAXSOCKS; i++) {
1201     if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].sock == z)) {
1202 fabian 1.10 for (idx = 0; idx < dcc_total; idx++) {
1203     if (dcc[idx].sock == z) {
1204     if (dcc[idx].type) {
1205     if (dcc[idx].type->name) {
1206     if (!strncmp(dcc[idx].type->name, "BOT", 3)) {
1207     otraffic_bn_today += len;
1208     break;
1209     } else if (!strcmp(dcc[idx].type->name, "SERVER")) {
1210     otraffic_irc_today += len;
1211     break;
1212     } else if (!strncmp(dcc[idx].type->name, "CHAT", 4)) {
1213     otraffic_dcc_today += len;
1214     break;
1215     } else if (!strncmp(dcc[idx].type->name, "FILES", 5)) {
1216     otraffic_filesys_today += len;
1217     break;
1218     } else if (!strcmp(dcc[idx].type->name, "SEND")) {
1219     otraffic_trans_today += len;
1220     break;
1221     } else if (!strncmp(dcc[idx].type->name, "GET", 3)) {
1222     otraffic_trans_today += len;
1223     break;
1224     } else {
1225     otraffic_unknown_today += len;
1226     break;
1227     }
1228     }
1229     }
1230     }
1231     }
1232    
1233 drummer 1.37 if (socklist[i].outbuf != NULL) {
1234     /* Already queueing: just add it */
1235 segfault 1.1 p = (char *) nrealloc(socklist[i].outbuf, socklist[i].outbuflen + len);
1236 fabian 1.18 egg_memcpy(p + socklist[i].outbuflen, s, len);
1237 segfault 1.1 socklist[i].outbuf = p;
1238     socklist[i].outbuflen += len;
1239     return;
1240     }
1241 fabian 1.16 /* Try. */
1242 segfault 1.1 x = write(z, s, len);
1243     if (x == (-1))
1244     x = 0;
1245     if (x < len) {
1246 fabian 1.16 /* Socket is full, queue it */
1247 segfault 1.1 socklist[i].outbuf = (char *) nmalloc(len - x);
1248 fabian 1.18 egg_memcpy(socklist[i].outbuf, &s[x], len - x);
1249 segfault 1.1 socklist[i].outbuflen = len - x;
1250     }
1251     return;
1252     }
1253     }
1254 fabian 1.12 /* Make sure we don't cause a crash by looping here */
1255     if (!inhere) {
1256     inhere = 1;
1257 fabian 1.16
1258 fabian 1.12 putlog(LOG_MISC, "*", "!!! writing to nonexistent socket: %d", z);
1259     s[strlen(s) - 1] = 0;
1260     putlog(LOG_MISC, "*", "!-> '%s'", s);
1261 fabian 1.16
1262 fabian 1.12 inhere = 0;
1263     }
1264 segfault 1.1 }
1265    
1266     /* tputs might queue data for sockets, let's dump as much of it as
1267 fabian 1.16 * possible.
1268     */
1269 segfault 1.1 void dequeue_sockets()
1270     {
1271     int i, x;
1272    
1273     for (i = 0; i < MAXSOCKS; i++) {
1274 drummer 1.37 if (!(socklist[i].flags & SOCK_UNUSED) &&
1275 fabian 1.22 socklist[i].outbuf != NULL) {
1276 fabian 1.16 /* Trick tputs into doing the work */
1277 segfault 1.1 x = write(socklist[i].sock, socklist[i].outbuf,
1278     socklist[i].outbuflen);
1279     if ((x < 0) && (errno != EAGAIN)
1280     #ifdef EBADSLT
1281     && (errno != EBADSLT)
1282     #endif
1283     #ifdef ENOTCONN
1284     && (errno != ENOTCONN)
1285     #endif
1286     ) {
1287 fabian 1.16 /* This detects an EOF during writing */
1288 segfault 1.1 debug3("net: eof!(write) socket %d (%s,%d)", socklist[i].sock,
1289     strerror(errno), errno);
1290     socklist[i].flags |= SOCK_EOFD;
1291     } else if (x == socklist[i].outbuflen) {
1292 fabian 1.16 /* If the whole buffer was sent, nuke it */
1293 segfault 1.1 nfree(socklist[i].outbuf);
1294     socklist[i].outbuf = NULL;
1295     socklist[i].outbuflen = 0;
1296     } else if (x > 0) {
1297     char *p = socklist[i].outbuf;
1298    
1299 fabian 1.16 /* This removes any sent bytes from the beginning of the buffer */
1300 segfault 1.1 socklist[i].outbuf = (char *) nmalloc(socklist[i].outbuflen - x);
1301 fabian 1.18 egg_memcpy(socklist[i].outbuf, p + x, socklist[i].outbuflen - x);
1302 segfault 1.1 socklist[i].outbuflen -= x;
1303     nfree(p);
1304     }
1305 fabian 1.15
1306     /* All queued data was sent. Call handler if one exists and the
1307     * dcc entry wants it.
1308     */
1309     if (!socklist[i].outbuf) {
1310     int idx = findanyidx(socklist[i].sock);
1311    
1312 fabian 1.22 if (idx > 0 && dcc[idx].type && dcc[idx].type->outdone)
1313 fabian 1.15 dcc[idx].type->outdone(idx);
1314     }
1315 segfault 1.1 }
1316     }
1317     }
1318 fabian 1.16
1319 segfault 1.1
1320 fabian 1.16 /*
1321     * Debugging stuff
1322     */
1323 segfault 1.1
1324     void tell_netdebug(int idx)
1325     {
1326     int i;
1327     char s[80];
1328    
1329     dprintf(idx, "Open sockets:");
1330     for (i = 0; i < MAXSOCKS; i++) {
1331     if (!(socklist[i].flags & SOCK_UNUSED)) {
1332     sprintf(s, " %d", socklist[i].sock);
1333     if (socklist[i].flags & SOCK_BINARY)
1334     strcat(s, " (binary)");
1335     if (socklist[i].flags & SOCK_LISTEN)
1336     strcat(s, " (listen)");
1337 fabian 1.3 if (socklist[i].flags & SOCK_PASS)
1338     strcat(s, " (passed on)");
1339 segfault 1.1 if (socklist[i].flags & SOCK_CONNECT)
1340     strcat(s, " (connecting)");
1341     if (socklist[i].flags & SOCK_STRONGCONN)
1342     strcat(s, " (strong)");
1343     if (socklist[i].flags & SOCK_NONSOCK)
1344     strcat(s, " (file)");
1345     if (socklist[i].inbuf != NULL)
1346     sprintf(&s[strlen(s)], " (inbuf: %04X)", strlen(socklist[i].inbuf));
1347     if (socklist[i].outbuf != NULL)
1348     sprintf(&s[strlen(s)], " (outbuf: %06lX)", socklist[i].outbuflen);
1349     strcat(s, ",");
1350     dprintf(idx, "%s", s);
1351     }
1352     }
1353     dprintf(idx, " done.\n");
1354     }
1355    
1356     /* Security-flavoured sanity checking on DCC connections of all sorts can be
1357     * done with this routine. Feed it the proper information from your DCC
1358     * before you attempt the connection, and this will make an attempt at
1359     * figuring out if the connection is really that person, or someone screwing
1360     * around. It's not foolproof, but anything that fails this check probably
1361     * isn't going to work anyway due to masquerading firewalls, NAT routers,
1362 fabian 1.16 * or bugs in mIRC.
1363     */
1364 segfault 1.1 int sanitycheck_dcc(char *nick, char *from, char *ipaddy, char *port)
1365     {
1366     /* According to the latest RFC, the clients SHOULD be able to handle
1367 fabian 1.16 * DNS names that are up to 255 characters long. This is not broken.
1368     */
1369 fabian 1.3 char badaddress[16];
1370 segfault 1.1 IP ip = my_atoul(ipaddy);
1371     int prt = atoi(port);
1372    
1373     /* It is disabled HERE so we only have to check in *one* spot! */
1374     if (!dcc_sanitycheck)
1375     return 1;
1376     if (prt < 1) {
1377     putlog(LOG_MISC, "*", "ALERT: (%s!%s) specified an impossible port of %u!",
1378     nick, from, prt);
1379     return 0;
1380     }
1381 fabian 1.3 sprintf(badaddress, "%u.%u.%u.%u", (ip >> 24) & 0xff, (ip >> 16) & 0xff,
1382     (ip >> 8) & 0xff, ip & 0xff);
1383 segfault 1.1 if (ip < (1 << 24)) {
1384     putlog(LOG_MISC, "*", "ALERT: (%s!%s) specified an impossible IP of %s!",
1385     nick, from, badaddress);
1386     return 0;
1387     }
1388 fabian 1.3 return 1;
1389     }
1390    
1391     int hostsanitycheck_dcc(char *nick, char *from, IP ip, char *dnsname,
1392     char *prt)
1393     {
1394     /* According to the latest RFC, the clients SHOULD be able to handle
1395 fabian 1.16 * DNS names that are up to 255 characters long. This is not broken.
1396     */
1397 fabian 1.23 char hostn[256], badaddress[16];
1398 fabian 1.3
1399     /* It is disabled HERE so we only have to check in *one* spot! */
1400     if (!dcc_sanitycheck)
1401     return 1;
1402     sprintf(badaddress, "%u.%u.%u.%u", (ip >> 24) & 0xff, (ip >> 16) & 0xff,
1403     (ip >> 8) & 0xff, ip & 0xff);
1404 segfault 1.1 /* These should pad like crazy with zeros, since 120 bytes or so is
1405     * where the routines providing our data currently lose interest. I'm
1406 fabian 1.16 * using the n-variant in case someone changes that...
1407     */
1408 guppy 1.27 strncpyz(hostn, extracthostname(from), sizeof hostn);
1409 fabian 1.23 if (!egg_strcasecmp(hostn, dnsname)) {
1410 segfault 1.1 putlog(LOG_DEBUG, "*", "DNS information for submitted IP checks out.");
1411     return 1;
1412     }
1413     if (!strcmp(badaddress, dnsname))
1414 fabian 1.23 putlog(LOG_MISC, "*", "ALERT: (%s!%s) sent a DCC request with bogus IP "
1415 guppy 1.32 "information of %s port %s. %s does not resolve to %s!", nick, from,
1416     badaddress, prt, from, badaddress);
1417 segfault 1.1 else
1418     return 1; /* <- usually happens when we have
1419 fabian 1.16 a user with an unresolved hostmask! */
1420 segfault 1.1 return 0;
1421 fabian 1.15 }
1422    
1423     /* Checks wether the referenced socket has data queued.
1424     *
1425     * Returns true if the incoming/outgoing (depending on 'type') queues
1426     * contain data, otherwise false.
1427     */
1428     int sock_has_data(int type, int sock)
1429     {
1430     int ret = 0, i;
1431    
1432     for (i = 0; i < MAXSOCKS; i++)
1433 fabian 1.22 if (!(socklist[i].flags & SOCK_UNUSED) && socklist[i].sock == sock)
1434 fabian 1.15 break;
1435     if (i < MAXSOCKS) {
1436     switch (type) {
1437     case SOCK_DATA_OUTGOING:
1438     ret = (socklist[i].outbuf != NULL);
1439     break;
1440     case SOCK_DATA_INCOMING:
1441     ret = (socklist[i].inbuf != NULL);
1442     break;
1443     }
1444 fabian 1.22 } else
1445     debug1("sock_has_data: could not find socket #%d, returning false.", sock);
1446 fabian 1.15 return ret;
1447 poptix 1.30 }
1448    
1449     /* flush_inbuf():
1450     * checks if there's data in the incoming buffer of an connection
1451     * and flushs the buffer if possible
1452     *
1453     * returns: -1 if the dcc entry wasn't found
1454     * -2 if dcc[idx].type->activity doesn't exist and the data couldn't
1455     * be handled
1456     * 0 if buffer was empty
1457     * otherwise length of flushed buffer
1458     */
1459     int flush_inbuf(int idx)
1460     {
1461     int i, len;
1462     char *inbuf;
1463    
1464     Assert((idx >= 0) && (idx < dcc_total));
1465     for (i = 0; i < MAXSOCKS; i++) {
1466     if ((dcc[idx].sock == socklist[i].sock)
1467     && !(socklist[i].flags & SOCK_UNUSED)) {
1468     len = socklist[i].inbuflen;
1469     if ((len > 0) && socklist[i].inbuf) {
1470     if (dcc[idx].type && dcc[idx].type->activity) {
1471     inbuf = socklist[i].inbuf;
1472     socklist[i].inbuf = NULL;
1473     dcc[idx].type->activity(idx, inbuf, len);
1474     nfree(inbuf);
1475     return len;
1476     } else
1477     return -2;
1478     } else
1479     return 0;
1480     }
1481     }
1482     return -1;
1483 segfault 1.1 }

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