/[cvs]/eggdrop1.9/src/net.c
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Revision 1.19 - (hide annotations) (download) (as text)
Fri Aug 18 00:25:09 2000 UTC (18 years, 10 months ago) by fabian
Branch: MAIN
CVS Tags: eggdrop105040
Changes since 1.18: +14 -6 lines
File MIME type: text/x-chdr
open_address_listen patch

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 fabian 1.19 * $Id: net.c,v 1.18 2000/03/23 23:17:55 fabian 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     #if !HAVE_GETDTABLESIZE
30 fabian 1.16 # ifdef FD_SETSIZE
31     # define getdtablesize() FD_SETSIZE
32     # else
33     # define getdtablesize() 200
34     # endif
35 segfault 1.1 #endif
36    
37 fabian 1.16 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 segfault 1.1
55 fabian 1.16 /* Types of proxy */
56 segfault 1.1 #define PROXY_SOCKS 1
57     #define PROXY_SUN 2
58    
59    
60 fabian 1.16 /* I need an UNSIGNED long for dcc type stuff
61     */
62 segfault 1.1 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 fabian 1.16 /* Initialize the socklist
75     */
76 segfault 1.1 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 fabian 1.9 Context;
90 segfault 1.1 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 fabian 1.16 /* Get my ip number
102     */
103 segfault 1.1 IP getmyip()
104     {
105     struct hostent *hp;
106     char s[121];
107     IP ip;
108     struct in_addr *in;
109    
110 fabian 1.16 /* Could be pre-defined */
111 segfault 1.1 if (myip[0]) {
112     if ((myip[strlen(myip) - 1] >= '0') && (myip[strlen(myip) - 1] <= '9'))
113     return (IP) inet_addr(myip);
114     }
115 fabian 1.16 /* Also could be pre-defined */
116 segfault 1.1 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 fabian 1.16 /* Return a free entry in the socket entry
203     */
204 fabian 1.3 int allocsock(int sock, int options)
205 segfault 1.1 {
206     int i;
207    
208 fabian 1.9 Context;
209 segfault 1.1 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 fabian 1.3 return i;
217     }
218     }
219     fatal("Socket table is full!", 0);
220 fabian 1.16 return -1; /* Never reached */
221 fabian 1.3 }
222    
223 fabian 1.16 /* Request a normal socket for i/o
224     */
225 fabian 1.3 void setsock(int sock, int options)
226     {
227     int i = allocsock(sock, options);
228     int parm;
229    
230 fabian 1.16 if (((sock != STDOUT) || backgrd) &&
231     !(socklist[i].flags & SOCK_NONSOCK)) {
232     parm = 1;
233 fabian 1.3 setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (void *) &parm, sizeof(int));
234 segfault 1.1
235 fabian 1.16 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 segfault 1.1 }
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 fabian 1.16 /* Done with a socket
258     */
259 segfault 1.1 void killsock(int sock)
260     {
261     int i;
262    
263     for (i = 0; i < MAXSOCKS; i++) {
264 fabian 1.2 if ((socklist[i].sock == sock) && !(socklist[i].flags & SOCK_UNUSED)) {
265 segfault 1.1 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 fabian 1.16 /* Send connection request to proxy
283     */
284 segfault 1.1 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 fabian 1.18 egg_memcpy(x, &ip, 4); /* Beige@Efnet */
297 segfault 1.1 } 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 fabian 1.18 egg_memcpy(x, hp->h_addr, hp->h_length);
311 segfault 1.1 }
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 fabian 1.16 /* Starts a connection attempt to a socket
327 fabian 1.11 *
328 fabian 1.3 * 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 fabian 1.11 *
332 segfault 1.1 * returns <0 if connection refused:
333     * -1 neterror() type error
334 fabian 1.16 * -2 can't resolve hostname
335     */
336 segfault 1.1 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 fabian 1.18 egg_bzero((char *) &name, sizeof(struct sockaddr_in));
361 segfault 1.1
362     name.sin_family = AF_INET;
363     name.sin_addr.s_addr = (myip[0] ? getmyip() : INADDR_ANY);
364 fabian 1.4 if (bind(sock, (struct sockaddr *) &name, sizeof(name)) < 0)
365 segfault 1.1 return -1;
366 fabian 1.18 egg_bzero((char *) &name, sizeof(struct sockaddr_in));
367 segfault 1.1
368     name.sin_family = AF_INET;
369     name.sin_port = my_htons(port);
370 fabian 1.16 /* Numeric IP? */
371 segfault 1.1 if ((host[strlen(host) - 1] >= '0') && (host[strlen(host) - 1] <= '9'))
372     name.sin_addr.s_addr = inet_addr(host);
373     else {
374 fabian 1.16 /* No, must be host.domain */
375     debug0("WARNING: open_telnet_raw() is about to block in gethostbyname()!");
376 segfault 1.1 if (!setjmp(alarmret)) {
377     alarm(resolve_timeout);
378     hp = gethostbyname(host);
379     alarm(0);
380     } else {
381     hp = NULL;
382     }
383 fabian 1.4 if (hp == NULL)
384 segfault 1.1 return -2;
385 fabian 1.18 egg_memcpy(&name.sin_addr, hp->h_addr, hp->h_length);
386 segfault 1.1 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 fabian 1.17 socklist[i].flags = (socklist[i].flags & ~SOCK_VIRTUAL) | SOCK_CONNECT;
391 segfault 1.1 }
392     if (connect(sock, (struct sockaddr *) &name,
393     sizeof(struct sockaddr_in)) < 0) {
394     if (errno == EINPROGRESS) {
395 fabian 1.16 /* Firewall? announce connect attempt to proxy */
396 segfault 1.1 if (firewall[0])
397     return proxy_connect(sock, server, sport, proxy);
398     return sock; /* async success! */
399 fabian 1.4 } else
400 segfault 1.1 return -1;
401     }
402 fabian 1.16 /* Synchronous? :/ */
403 segfault 1.1 if (firewall[0])
404     return proxy_connect(sock, server, sport, proxy);
405     return sock;
406     }
407    
408 fabian 1.16 /* Ordinary non-binary connection attempt */
409 segfault 1.1 int open_telnet(char *server, int port)
410     {
411 fabian 1.4 int sock = getsock(0),
412     ret = open_telnet_raw(sock, server, port);
413    
414     if (ret < 0)
415     killsock(sock);
416     return ret;
417 segfault 1.1 }
418    
419 fabian 1.16 /* Returns a socket number for a listening socket that will accept any
420 fabian 1.19 * connection on a certain address -- port # is returned in port
421 fabian 1.16 */
422 fabian 1.19 int open_address_listen(IP addr, int *port)
423 segfault 1.1 {
424 fabian 1.13 int sock;
425     unsigned int addrlen;
426 segfault 1.1 struct sockaddr_in name;
427    
428     if (firewall[0]) {
429     /* FIXME: can't do listen port thru firewall yet */
430 fabian 1.6 putlog(LOG_MISC, "*", "!! Cant open a listen port (you are using a firewall)");
431 segfault 1.1 return -1;
432     }
433     sock = getsock(SOCK_LISTEN);
434 fabian 1.18 egg_bzero((char *) &name, sizeof(struct sockaddr_in));
435 segfault 1.1
436     name.sin_family = AF_INET;
437 fabian 1.19 name.sin_port = htons(*port); /* 0 = just assign us a port */
438     name.sin_addr.s_addr = addr;
439 segfault 1.1 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 fabian 1.19 *port = ntohs(name.sin_port);
450 segfault 1.1 if (listen(sock, 1) < 0) {
451     killsock(sock);
452     return -1;
453     }
454     return sock;
455 fabian 1.19 }
456    
457     /* Returns a socket number for a listening socket that will accept any
458     * connection -- port # is returned in port
459     */
460     inline int open_listen(int *port)
461     {
462     return open_address_listen(myip[0] ? getmyip() : INADDR_ANY, port);
463 segfault 1.1 }
464    
465 fabian 1.3 /* Given a network-style IP address, returns the hostname. The hostname
466     * will be in the "##.##.##.##" format if there was an error.
467     *
468     * NOTE: This function is depreciated. Try using the async dns approach
469 fabian 1.16 * instead.
470     */
471 segfault 1.1 char *hostnamefromip(unsigned long ip)
472     {
473     struct hostent *hp;
474     unsigned long addr = ip;
475     unsigned char *p;
476 fabian 1.3 static char s[UHOSTLEN];
477 segfault 1.1
478     if (!setjmp(alarmret)) {
479     alarm(resolve_timeout);
480     hp = gethostbyaddr((char *) &addr, sizeof(addr), AF_INET);
481     alarm(0);
482     } else {
483     hp = NULL;
484     }
485     if (hp == NULL) {
486     p = (unsigned char *) &addr;
487     sprintf(s, "%u.%u.%u.%u", p[0], p[1], p[2], p[3]);
488     return s;
489     }
490 fabian 1.3 strncpy(s, hp->h_name, UHOSTLEN - 1);
491     s[UHOSTLEN - 1] = 0;
492 segfault 1.1 return s;
493     }
494    
495 fabian 1.5 /* Returns the given network byte order IP address in the
496 fabian 1.16 * dotted format - "##.##.##.##"
497     */
498 fabian 1.3 char *iptostr(IP ip)
499     {
500     struct in_addr a;
501    
502     a.s_addr = ip;
503     return inet_ntoa(a);
504     }
505    
506 fabian 1.16 /* Short routine to answer a connect received on a socket made previously
507 segfault 1.1 * by open_listen ... returns hostname of the caller & the new socket
508 fabian 1.16 * does NOT dispose of old "public" socket!
509     */
510     int answer(int sock, char *caller, unsigned long *ip, unsigned short *port,
511     int binary)
512 segfault 1.1 {
513 fabian 1.13 int new_sock;
514     unsigned int addrlen;
515 segfault 1.1 struct sockaddr_in from;
516 fabian 1.8 addrlen = sizeof(struct sockaddr);
517 fabian 1.3
518 segfault 1.1 new_sock = accept(sock, (struct sockaddr *) &from, &addrlen);
519     if (new_sock < 0)
520     return -1;
521     if (ip != NULL) {
522     *ip = from.sin_addr.s_addr;
523 fabian 1.16 /* This is now done asynchronously. We now only provide the IP address.
524     *
525 fabian 1.3 * strncpy(caller, hostnamefromip(*ip), 120);
526     */
527     strncpy(caller, iptostr(*ip), 120);
528 segfault 1.1 caller[120] = 0;
529     *ip = my_ntohl(*ip);
530     }
531     if (port != NULL)
532     *port = my_ntohs(from.sin_port);
533 fabian 1.16 /* Set up all the normal socket crap */
534 segfault 1.1 setsock(new_sock, (binary ? SOCK_BINARY : 0));
535     return new_sock;
536     }
537    
538 fabian 1.16 /* Like open_telnet, but uses server & port specifications of dcc
539     */
540 segfault 1.1 int open_telnet_dcc(int sock, char *server, char *port)
541     {
542     int p;
543     unsigned long addr;
544     char sv[121];
545     unsigned char c[4];
546    
547     if (port != NULL)
548     p = atoi(port);
549     else
550     p = 2000;
551     if (server != NULL)
552     addr = my_atoul(server);
553     else
554     addr = 0L;
555     if (addr < (1 << 24))
556     return -3; /* fake address */
557     c[0] = (addr >> 24) & 0xff;
558     c[1] = (addr >> 16) & 0xff;
559     c[2] = (addr >> 8) & 0xff;
560     c[3] = addr & 0xff;
561     sprintf(sv, "%u.%u.%u.%u", c[0], c[1], c[2], c[3]);
562     /* strcpy(sv,hostnamefromip(addr)); */
563     p = open_telnet_raw(sock, sv, p);
564     return p;
565     }
566    
567 fabian 1.16 /* Attempts to read from all the sockets in socklist
568 segfault 1.1 * fills s with up to 511 bytes if available, and returns the array index
569 fabian 1.16 *
570     * on EOF: returns -1, with socket in len
571     * on socket error: returns -2
572     * if nothing is ready: returns -3
573     */
574 segfault 1.1 static int sockread(char *s, int *len)
575     {
576     fd_set fd;
577     int fds, i, x;
578     struct timeval t;
579     int grab = 511;
580    
581     fds = getdtablesize();
582     #ifdef FD_SETSIZE
583     if (fds > FD_SETSIZE)
584 fabian 1.16 fds = FD_SETSIZE; /* Fixes YET ANOTHER freebsd bug!!! */
585 segfault 1.1 #endif
586     /* timeout: 1 sec */
587     t.tv_sec = 1;
588     t.tv_usec = 0;
589     FD_ZERO(&fd);
590 fabian 1.17
591 segfault 1.1 for (i = 0; i < MAXSOCKS; i++)
592 fabian 1.17 if (!(socklist[i].flags & (SOCK_UNUSED | SOCK_VIRTUAL))) {
593 segfault 1.1 if ((socklist[i].sock == STDOUT) && !backgrd)
594     FD_SET(STDIN, &fd);
595     else
596     FD_SET(socklist[i].sock, &fd);
597     }
598     #ifdef HPUX_HACKS
599     #ifndef HPUX10_HACKS
600     x = select(fds, (int *) &fd, (int *) NULL, (int *) NULL, &t);
601     #else
602     x = select(fds, &fd, NULL, NULL, &t);
603     #endif
604     #else
605     x = select(fds, &fd, NULL, NULL, &t);
606     #endif
607     if (x > 0) {
608 fabian 1.16 /* Something happened */
609 segfault 1.1 for (i = 0; i < MAXSOCKS; i++) {
610     if ((!(socklist[i].flags & SOCK_UNUSED)) &&
611     ((FD_ISSET(socklist[i].sock, &fd)) ||
612     ((socklist[i].sock == STDOUT) && (!backgrd) &&
613     (FD_ISSET(STDIN, &fd))))) {
614     if (socklist[i].flags & (SOCK_LISTEN | SOCK_CONNECT)) {
615 fabian 1.16 /* Listening socket -- don't read, just return activity */
616     /* Same for connection attempt */
617 segfault 1.1 /* (for strong connections, require a read to succeed first) */
618     if (socklist[i].flags & SOCK_PROXYWAIT) { /* drummer */
619 fabian 1.16 /* Hang around to get the return code from proxy */
620 segfault 1.1 grab = 10;
621     } else if (!(socklist[i].flags & SOCK_STRONGCONN)) {
622     debug1("net: connect! sock %d", socklist[i].sock);
623     s[0] = 0;
624     *len = 0;
625     return i;
626     }
627 fabian 1.3 } else if (socklist[i].flags & SOCK_PASS) {
628     s[0] = 0;
629     *len = 0;
630     return i;
631 segfault 1.1 }
632     if ((socklist[i].sock == STDOUT) && !backgrd)
633     x = read(STDIN, s, grab);
634     else
635     x = read(socklist[i].sock, s, grab);
636     if (x <= 0) { /* eof */
637     if (x == EAGAIN) {
638     s[0] = 0;
639     *len = 0;
640     return -3;
641     }
642     *len = socklist[i].sock;
643     socklist[i].flags &= ~SOCK_CONNECT;
644     debug1("net: eof!(read) socket %d", socklist[i].sock);
645     return -1;
646     }
647     s[x] = 0;
648     *len = x;
649     if (socklist[i].flags & SOCK_PROXYWAIT) {
650     debug2("net: socket: %d proxy errno: %d", socklist[i].sock, s[1]);
651     socklist[i].flags &= ~(SOCK_CONNECT | SOCK_PROXYWAIT);
652     switch (s[1]) {
653 fabian 1.16 case 90: /* Success */
654 segfault 1.1 s[0] = 0;
655     *len = 0;
656     return i;
657 fabian 1.16 case 91: /* Failed */
658 segfault 1.1 errno = ECONNREFUSED;
659     break;
660 fabian 1.16 case 92: /* No identd */
661     case 93: /* Identd said wrong username */
662     /* A better error message would be "socks misconfigured"
663     * or "identd not working" but this is simplest.
664     */
665 segfault 1.1 errno = ENETUNREACH;
666     break;
667     }
668     *len = socklist[i].sock;
669     return -1;
670     }
671     return i;
672     }
673     }
674     } else if (x == -1)
675     return -2; /* socket error */
676     else {
677     s[0] = 0;
678     *len = 0;
679     }
680     return -3;
681     }
682    
683     /* sockgets: buffer and read from sockets
684     *
685 fabian 1.16 * Attempts to read from all registered sockets for up to one second. if
686 segfault 1.1 * after one second, no complete data has been received from any of the
687     * sockets, 's' will be empty, 'len' will be 0, and sockgets will return -3.
688     * if there is returnable data received from a socket, the data will be
689     * in 's' (null-terminated if non-binary), the length will be returned
690     * in len, and the socket number will be returned.
691     * normal sockets have their input buffered, and each call to sockgets
692     * will return one line terminated with a '\n'. binary sockets are not
693     * buffered and return whatever coems in as soon as it arrives.
694     * listening sockets will return an empty string when a connection comes in.
695     * connecting sockets will return an empty string on a successful connect,
696     * or EOF on a failed connect.
697     * if an EOF is detected from any of the sockets, that socket number will be
698     * put in len, and -1 will be returned.
699     * the maximum length of the string returned is 512 (including null)
700     */
701    
702     int sockgets(char *s, int *len)
703     {
704     char xx[514], *p, *px;
705     int ret, i, data = 0;
706    
707 fabian 1.9 Context;
708 segfault 1.1 for (i = 0; i < MAXSOCKS; i++) {
709 fabian 1.16 /* Check for stored-up data waiting to be processed */
710 segfault 1.1 if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].inbuf != NULL)) {
711     /* look for \r too cos windows can't follow RFCs */
712     p = strchr(socklist[i].inbuf, '\n');
713     if (p == NULL)
714     p = strchr(socklist[i].inbuf, '\r');
715     if (p != NULL) {
716     *p = 0;
717     if (strlen(socklist[i].inbuf) > 510)
718     socklist[i].inbuf[510] = 0;
719     strcpy(s, socklist[i].inbuf);
720     px = (char *) nmalloc(strlen(p + 1) + 1);
721     strcpy(px, p + 1);
722     nfree(socklist[i].inbuf);
723     if (px[0])
724     socklist[i].inbuf = px;
725     else {
726     nfree(px);
727     socklist[i].inbuf = NULL;
728     }
729 fabian 1.16 /* Strip CR if this was CR/LF combo */
730 segfault 1.1 if (s[strlen(s) - 1] == '\r')
731     s[strlen(s) - 1] = 0;
732     *len = strlen(s);
733     return socklist[i].sock;
734     }
735     }
736 fabian 1.16 /* Also check any sockets that might have EOF'd during write */
737 segfault 1.1 if (!(socklist[i].flags & SOCK_UNUSED)
738     && (socklist[i].flags & SOCK_EOFD)) {
739 fabian 1.9 Context;
740 segfault 1.1 s[0] = 0;
741     *len = socklist[i].sock;
742     return -1;
743     }
744     }
745 fabian 1.16 /* No pent-up data of any worth -- down to business */
746 fabian 1.9 Context;
747 segfault 1.1 *len = 0;
748     ret = sockread(xx, len);
749     if (ret < 0) {
750     s[0] = 0;
751     return ret;
752     }
753 fabian 1.16 /* Binary, listening and passed on sockets don't get buffered. */
754 segfault 1.1 if (socklist[ret].flags & SOCK_CONNECT) {
755     if (socklist[ret].flags & SOCK_STRONGCONN) {
756     socklist[ret].flags &= ~SOCK_STRONGCONN;
757 fabian 1.16 /* Buffer any data that came in, for future read */
758 segfault 1.1 socklist[ret].inbuf = (char *) nmalloc(strlen(xx) + 1);
759     strcpy(socklist[ret].inbuf, xx);
760     }
761     socklist[ret].flags &= ~SOCK_CONNECT;
762     s[0] = 0;
763     return socklist[ret].sock;
764     }
765     if (socklist[ret].flags & SOCK_BINARY) {
766 fabian 1.18 egg_memcpy(s, xx, *len);
767 segfault 1.1 return socklist[ret].sock;
768     }
769 fabian 1.3 if ((socklist[ret].flags & SOCK_LISTEN) ||
770     (socklist[ret].flags & SOCK_PASS))
771 segfault 1.1 return socklist[ret].sock;
772 fabian 1.9 Context;
773 fabian 1.16 /* Might be necessary to prepend stored-up data! */
774 segfault 1.1 if (socklist[ret].inbuf != NULL) {
775     p = socklist[ret].inbuf;
776     socklist[ret].inbuf = (char *) nmalloc(strlen(p) + strlen(xx) + 1);
777     strcpy(socklist[ret].inbuf, p);
778     strcat(socklist[ret].inbuf, xx);
779     nfree(p);
780     if (strlen(socklist[ret].inbuf) < 512) {
781     strcpy(xx, socklist[ret].inbuf);
782     nfree(socklist[ret].inbuf);
783     socklist[ret].inbuf = NULL;
784     } else {
785     p = socklist[ret].inbuf;
786     socklist[ret].inbuf = (char *) nmalloc(strlen(p) - 509);
787     strcpy(socklist[ret].inbuf, p + 510);
788     *(p + 510) = 0;
789     strcpy(xx, p);
790     nfree(p);
791     /* (leave the rest to be post-pended later) */
792     }
793     }
794 fabian 1.9 Context;
795 fabian 1.16 /* Look for EOL marker; if it's there, i have something to show */
796 segfault 1.1 p = strchr(xx, '\n');
797     if (p == NULL)
798     p = strchr(xx, '\r');
799     if (p != NULL) {
800     *p = 0;
801     strcpy(s, xx);
802     strcpy(xx, p + 1);
803     if (s[strlen(s) - 1] == '\r')
804     s[strlen(s) - 1] = 0;
805     data = 1; /* DCC_CHAT may now need to process a
806 fabian 1.16 blank line */
807 segfault 1.1 /* NO! */
808     /* if (!s[0]) strcpy(s," "); */
809     } else {
810     s[0] = 0;
811     if (strlen(xx) >= 510) {
812 fabian 1.16 /* String is too long, so just insert fake \n */
813 segfault 1.1 strcpy(s, xx);
814     xx[0] = 0;
815     data = 1;
816     }
817     }
818 fabian 1.9 Context;
819 segfault 1.1 *len = strlen(s);
820 fabian 1.16 /* Anything left that needs to be saved? */
821 segfault 1.1 if (!xx[0]) {
822     if (data)
823     return socklist[ret].sock;
824     else
825     return -3;
826     }
827 fabian 1.9 Context;
828 fabian 1.16 /* Prepend old data back */
829 segfault 1.1 if (socklist[ret].inbuf != NULL) {
830 fabian 1.9 Context;
831 segfault 1.1 p = socklist[ret].inbuf;
832     socklist[ret].inbuf = (char *) nmalloc(strlen(p) + strlen(xx) + 1);
833     strcpy(socklist[ret].inbuf, xx);
834     strcat(socklist[ret].inbuf, p);
835     nfree(p);
836     } else {
837 fabian 1.9 Context;
838 segfault 1.1 socklist[ret].inbuf = (char *) nmalloc(strlen(xx) + 1);
839     strcpy(socklist[ret].inbuf, xx);
840     }
841 fabian 1.9 Context;
842 segfault 1.1 if (data) {
843 fabian 1.9 Context;
844 segfault 1.1 return socklist[ret].sock;
845     } else {
846 fabian 1.9 Context;
847 segfault 1.1 return -3;
848     }
849     }
850    
851 fabian 1.16 /* Dump something to a socket
852     *
853     * NOTE: Do NOT put Contexts in here if you want DEBUG to be meaningful!!
854     */
855 fabian 1.12 void tputs(register int z, char *s, unsigned int len)
856 segfault 1.1 {
857 fabian 1.12 register int i, x, idx;
858 segfault 1.1 char *p;
859 fabian 1.12 static int inhere = 0;
860 segfault 1.1
861     if (z < 0)
862     return; /* um... HELLO?! sanity check please! */
863     if (((z == STDOUT) || (z == STDERR)) && (!backgrd || use_stderr)) {
864     write(z, s, len);
865     return;
866     }
867     for (i = 0; i < MAXSOCKS; i++) {
868     if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].sock == z)) {
869 fabian 1.10 for (idx = 0; idx < dcc_total; idx++) {
870     if (dcc[idx].sock == z) {
871     if (dcc[idx].type) {
872     if (dcc[idx].type->name) {
873     if (!strncmp(dcc[idx].type->name, "BOT", 3)) {
874     otraffic_bn_today += len;
875     break;
876     } else if (!strcmp(dcc[idx].type->name, "SERVER")) {
877     otraffic_irc_today += len;
878     break;
879     } else if (!strncmp(dcc[idx].type->name, "CHAT", 4)) {
880     otraffic_dcc_today += len;
881     break;
882     } else if (!strncmp(dcc[idx].type->name, "FILES", 5)) {
883     otraffic_filesys_today += len;
884     break;
885     } else if (!strcmp(dcc[idx].type->name, "SEND")) {
886     otraffic_trans_today += len;
887     break;
888     } else if (!strncmp(dcc[idx].type->name, "GET", 3)) {
889     otraffic_trans_today += len;
890     break;
891     } else {
892     otraffic_unknown_today += len;
893     break;
894     }
895     }
896     }
897     }
898     }
899    
900 segfault 1.1 if (socklist[i].outbuf != NULL) {
901 fabian 1.16 /* Already queueing: just add it */
902 segfault 1.1 p = (char *) nrealloc(socklist[i].outbuf, socklist[i].outbuflen + len);
903 fabian 1.18 egg_memcpy(p + socklist[i].outbuflen, s, len);
904 segfault 1.1 socklist[i].outbuf = p;
905     socklist[i].outbuflen += len;
906     return;
907     }
908 fabian 1.16 /* Try. */
909 segfault 1.1 x = write(z, s, len);
910     if (x == (-1))
911     x = 0;
912     if (x < len) {
913 fabian 1.16 /* Socket is full, queue it */
914 segfault 1.1 socklist[i].outbuf = (char *) nmalloc(len - x);
915 fabian 1.18 egg_memcpy(socklist[i].outbuf, &s[x], len - x);
916 segfault 1.1 socklist[i].outbuflen = len - x;
917     }
918     return;
919     }
920     }
921 fabian 1.12 /* Make sure we don't cause a crash by looping here */
922     if (!inhere) {
923     inhere = 1;
924 fabian 1.16
925 fabian 1.12 putlog(LOG_MISC, "*", "!!! writing to nonexistent socket: %d", z);
926     s[strlen(s) - 1] = 0;
927     putlog(LOG_MISC, "*", "!-> '%s'", s);
928 fabian 1.16
929 fabian 1.12 inhere = 0;
930     }
931 segfault 1.1 }
932    
933     /* tputs might queue data for sockets, let's dump as much of it as
934 fabian 1.16 * possible.
935     */
936 segfault 1.1 void dequeue_sockets()
937     {
938     int i, x;
939    
940     for (i = 0; i < MAXSOCKS; i++) {
941     if (!(socklist[i].flags & SOCK_UNUSED) &&
942     (socklist[i].outbuf != NULL)) {
943 fabian 1.16 /* Trick tputs into doing the work */
944 segfault 1.1 x = write(socklist[i].sock, socklist[i].outbuf,
945     socklist[i].outbuflen);
946     if ((x < 0) && (errno != EAGAIN)
947     #ifdef EBADSLT
948     && (errno != EBADSLT)
949     #endif
950     #ifdef ENOTCONN
951     && (errno != ENOTCONN)
952     #endif
953     ) {
954 fabian 1.16 /* This detects an EOF during writing */
955 segfault 1.1 debug3("net: eof!(write) socket %d (%s,%d)", socklist[i].sock,
956     strerror(errno), errno);
957     socklist[i].flags |= SOCK_EOFD;
958     } else if (x == socklist[i].outbuflen) {
959 fabian 1.16 /* If the whole buffer was sent, nuke it */
960 segfault 1.1 nfree(socklist[i].outbuf);
961     socklist[i].outbuf = NULL;
962     socklist[i].outbuflen = 0;
963     } else if (x > 0) {
964     char *p = socklist[i].outbuf;
965    
966 fabian 1.16 /* This removes any sent bytes from the beginning of the buffer */
967 segfault 1.1 socklist[i].outbuf = (char *) nmalloc(socklist[i].outbuflen - x);
968 fabian 1.18 egg_memcpy(socklist[i].outbuf, p + x, socklist[i].outbuflen - x);
969 segfault 1.1 socklist[i].outbuflen -= x;
970     nfree(p);
971     }
972 fabian 1.15
973     /* All queued data was sent. Call handler if one exists and the
974     * dcc entry wants it.
975     */
976     if (!socklist[i].outbuf) {
977     int idx = findanyidx(socklist[i].sock);
978    
979     if ((idx > 0) && dcc[idx].type && dcc[idx].type->outdone)
980     dcc[idx].type->outdone(idx);
981     }
982 segfault 1.1 }
983     }
984     }
985 fabian 1.16
986 segfault 1.1
987 fabian 1.16 /*
988     * Debugging stuff
989     */
990 segfault 1.1
991     void tell_netdebug(int idx)
992     {
993     int i;
994     char s[80];
995    
996     dprintf(idx, "Open sockets:");
997     for (i = 0; i < MAXSOCKS; i++) {
998     if (!(socklist[i].flags & SOCK_UNUSED)) {
999     sprintf(s, " %d", socklist[i].sock);
1000     if (socklist[i].flags & SOCK_BINARY)
1001     strcat(s, " (binary)");
1002     if (socklist[i].flags & SOCK_LISTEN)
1003     strcat(s, " (listen)");
1004 fabian 1.3 if (socklist[i].flags & SOCK_PASS)
1005     strcat(s, " (passed on)");
1006 segfault 1.1 if (socklist[i].flags & SOCK_CONNECT)
1007     strcat(s, " (connecting)");
1008     if (socklist[i].flags & SOCK_STRONGCONN)
1009     strcat(s, " (strong)");
1010     if (socklist[i].flags & SOCK_NONSOCK)
1011     strcat(s, " (file)");
1012     if (socklist[i].inbuf != NULL)
1013     sprintf(&s[strlen(s)], " (inbuf: %04X)", strlen(socklist[i].inbuf));
1014     if (socklist[i].outbuf != NULL)
1015     sprintf(&s[strlen(s)], " (outbuf: %06lX)", socklist[i].outbuflen);
1016     strcat(s, ",");
1017     dprintf(idx, "%s", s);
1018     }
1019     }
1020     dprintf(idx, " done.\n");
1021     }
1022    
1023     /* Security-flavoured sanity checking on DCC connections of all sorts can be
1024     * done with this routine. Feed it the proper information from your DCC
1025     * before you attempt the connection, and this will make an attempt at
1026     * figuring out if the connection is really that person, or someone screwing
1027     * around. It's not foolproof, but anything that fails this check probably
1028     * isn't going to work anyway due to masquerading firewalls, NAT routers,
1029 fabian 1.16 * or bugs in mIRC.
1030     */
1031 segfault 1.1 int sanitycheck_dcc(char *nick, char *from, char *ipaddy, char *port)
1032     {
1033     /* According to the latest RFC, the clients SHOULD be able to handle
1034 fabian 1.16 * DNS names that are up to 255 characters long. This is not broken.
1035     */
1036 fabian 1.3 char badaddress[16];
1037 segfault 1.1 IP ip = my_atoul(ipaddy);
1038     int prt = atoi(port);
1039    
1040     /* It is disabled HERE so we only have to check in *one* spot! */
1041     if (!dcc_sanitycheck)
1042     return 1;
1043 fabian 1.9 Context; /* This should be pretty solid, but
1044 fabian 1.16 something _might_ break. */
1045 segfault 1.1 if (prt < 1) {
1046     putlog(LOG_MISC, "*", "ALERT: (%s!%s) specified an impossible port of %u!",
1047     nick, from, prt);
1048     return 0;
1049     }
1050 fabian 1.3 sprintf(badaddress, "%u.%u.%u.%u", (ip >> 24) & 0xff, (ip >> 16) & 0xff,
1051     (ip >> 8) & 0xff, ip & 0xff);
1052 segfault 1.1 if (ip < (1 << 24)) {
1053     putlog(LOG_MISC, "*", "ALERT: (%s!%s) specified an impossible IP of %s!",
1054     nick, from, badaddress);
1055     return 0;
1056     }
1057 fabian 1.3 return 1;
1058     }
1059    
1060     int hostsanitycheck_dcc(char *nick, char *from, IP ip, char *dnsname,
1061     char *prt)
1062     {
1063     /* According to the latest RFC, the clients SHOULD be able to handle
1064 fabian 1.16 * DNS names that are up to 255 characters long. This is not broken.
1065     */
1066 fabian 1.3 char hostname[256], badaddress[16];
1067    
1068     /* It is disabled HERE so we only have to check in *one* spot! */
1069     if (!dcc_sanitycheck)
1070     return 1;
1071 fabian 1.9 Context; /* This should be pretty solid, but
1072 fabian 1.16 something _might_ break. */
1073 fabian 1.3 sprintf(badaddress, "%u.%u.%u.%u", (ip >> 24) & 0xff, (ip >> 16) & 0xff,
1074     (ip >> 8) & 0xff, ip & 0xff);
1075 segfault 1.1 /* These should pad like crazy with zeros, since 120 bytes or so is
1076     * where the routines providing our data currently lose interest. I'm
1077 fabian 1.16 * using the n-variant in case someone changes that...
1078     */
1079 fabian 1.7 strncpy(hostname, extracthostname(from), 255);
1080     hostname[255] = 0;
1081 fabian 1.18 if (!egg_strcasecmp(hostname, dnsname)) {
1082 segfault 1.1 putlog(LOG_DEBUG, "*", "DNS information for submitted IP checks out.");
1083     return 1;
1084     }
1085     if (!strcmp(badaddress, dnsname))
1086     putlog(LOG_MISC, "*", "ALERT: (%s!%s) sent a DCC request with bogus IP information of %s port %u!",
1087     nick, from, badaddress, prt);
1088     else
1089     return 1; /* <- usually happens when we have
1090 fabian 1.16 a user with an unresolved hostmask! */
1091 segfault 1.1 return 0;
1092 fabian 1.15 }
1093    
1094     /* Checks wether the referenced socket has data queued.
1095     *
1096     * Returns true if the incoming/outgoing (depending on 'type') queues
1097     * contain data, otherwise false.
1098     */
1099     int sock_has_data(int type, int sock)
1100     {
1101     int ret = 0, i;
1102    
1103     for (i = 0; i < MAXSOCKS; i++)
1104     if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].sock == sock))
1105     break;
1106     if (i < MAXSOCKS) {
1107     switch (type) {
1108     case SOCK_DATA_OUTGOING:
1109     ret = (socklist[i].outbuf != NULL);
1110     break;
1111     case SOCK_DATA_INCOMING:
1112     ret = (socklist[i].inbuf != NULL);
1113     break;
1114     }
1115     }
1116     return ret;
1117 segfault 1.1 }

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