root / slirp / udp.c @ c4dfa5b7
History | View | Annotate | Download (16.6 kB)
1 |
/*
|
---|---|
2 |
* Copyright (c) 1982, 1986, 1988, 1990, 1993
|
3 |
* The Regents of the University of California. All rights reserved.
|
4 |
*
|
5 |
* Redistribution and use in source and binary forms, with or without
|
6 |
* modification, are permitted provided that the following conditions
|
7 |
* are met:
|
8 |
* 1. Redistributions of source code must retain the above copyright
|
9 |
* notice, this list of conditions and the following disclaimer.
|
10 |
* 2. Redistributions in binary form must reproduce the above copyright
|
11 |
* notice, this list of conditions and the following disclaimer in the
|
12 |
* documentation and/or other materials provided with the distribution.
|
13 |
* 3. All advertising materials mentioning features or use of this software
|
14 |
* must display the following acknowledgement:
|
15 |
* This product includes software developed by the University of
|
16 |
* California, Berkeley and its contributors.
|
17 |
* 4. Neither the name of the University nor the names of its contributors
|
18 |
* may be used to endorse or promote products derived from this software
|
19 |
* without specific prior written permission.
|
20 |
*
|
21 |
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
22 |
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
23 |
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
24 |
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
25 |
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
26 |
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
27 |
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
28 |
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
29 |
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
30 |
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
31 |
* SUCH DAMAGE.
|
32 |
*
|
33 |
* @(#)udp_usrreq.c 8.4 (Berkeley) 1/21/94
|
34 |
* udp_usrreq.c,v 1.4 1994/10/02 17:48:45 phk Exp
|
35 |
*/
|
36 |
|
37 |
/*
|
38 |
* Changes and additions relating to SLiRP
|
39 |
* Copyright (c) 1995 Danny Gasparovski.
|
40 |
*
|
41 |
* Please read the file COPYRIGHT for the
|
42 |
* terms and conditions of the copyright.
|
43 |
*/
|
44 |
|
45 |
#include <slirp.h> |
46 |
#include "ip_icmp.h" |
47 |
|
48 |
struct udpstat udpstat;
|
49 |
|
50 |
struct socket udb;
|
51 |
|
52 |
/*
|
53 |
* UDP protocol implementation.
|
54 |
* Per RFC 768, August, 1980.
|
55 |
*/
|
56 |
#ifndef COMPAT_42
|
57 |
int udpcksum = 1; |
58 |
#else
|
59 |
int udpcksum = 0; /* XXX */ |
60 |
#endif
|
61 |
|
62 |
struct socket *udp_last_so = &udb;
|
63 |
|
64 |
void
|
65 |
udp_init() |
66 |
{ |
67 |
udb.so_next = udb.so_prev = &udb; |
68 |
} |
69 |
/* m->m_data points at ip packet header
|
70 |
* m->m_len length ip packet
|
71 |
* ip->ip_len length data (IPDU)
|
72 |
*/
|
73 |
void
|
74 |
udp_input(m, iphlen) |
75 |
register struct mbuf *m; |
76 |
int iphlen;
|
77 |
{ |
78 |
register struct ip *ip; |
79 |
register struct udphdr *uh; |
80 |
/* struct mbuf *opts = 0;*/
|
81 |
int len;
|
82 |
struct ip save_ip;
|
83 |
struct socket *so;
|
84 |
|
85 |
DEBUG_CALL("udp_input");
|
86 |
DEBUG_ARG("m = %lx", (long)m); |
87 |
DEBUG_ARG("iphlen = %d", iphlen);
|
88 |
|
89 |
udpstat.udps_ipackets++; |
90 |
|
91 |
/*
|
92 |
* Strip IP options, if any; should skip this,
|
93 |
* make available to user, and use on returned packets,
|
94 |
* but we don't yet have a way to check the checksum
|
95 |
* with options still present.
|
96 |
*/
|
97 |
if(iphlen > sizeof(struct ip)) { |
98 |
ip_stripoptions(m, (struct mbuf *)0); |
99 |
iphlen = sizeof(struct ip); |
100 |
} |
101 |
|
102 |
/*
|
103 |
* Get IP and UDP header together in first mbuf.
|
104 |
*/
|
105 |
ip = mtod(m, struct ip *);
|
106 |
uh = (struct udphdr *)((caddr_t)ip + iphlen);
|
107 |
|
108 |
/*
|
109 |
* Make mbuf data length reflect UDP length.
|
110 |
* If not enough data to reflect UDP length, drop.
|
111 |
*/
|
112 |
len = ntohs((u_int16_t)uh->uh_ulen); |
113 |
|
114 |
if (ip->ip_len != len) {
|
115 |
if (len > ip->ip_len) {
|
116 |
udpstat.udps_badlen++; |
117 |
goto bad;
|
118 |
} |
119 |
m_adj(m, len - ip->ip_len); |
120 |
ip->ip_len = len; |
121 |
} |
122 |
|
123 |
/*
|
124 |
* Save a copy of the IP header in case we want restore it
|
125 |
* for sending an ICMP error message in response.
|
126 |
*/
|
127 |
save_ip = *ip; |
128 |
save_ip.ip_len+= iphlen; /* tcp_input subtracts this */
|
129 |
|
130 |
/*
|
131 |
* Checksum extended UDP header and data.
|
132 |
*/
|
133 |
if (udpcksum && uh->uh_sum) {
|
134 |
((struct ipovly *)ip)->ih_next = 0; |
135 |
((struct ipovly *)ip)->ih_prev = 0; |
136 |
((struct ipovly *)ip)->ih_x1 = 0; |
137 |
((struct ipovly *)ip)->ih_len = uh->uh_ulen;
|
138 |
/* keep uh_sum for ICMP reply
|
139 |
* uh->uh_sum = cksum(m, len + sizeof (struct ip));
|
140 |
* if (uh->uh_sum) {
|
141 |
*/
|
142 |
if(cksum(m, len + sizeof(struct ip))) { |
143 |
udpstat.udps_badsum++; |
144 |
goto bad;
|
145 |
} |
146 |
} |
147 |
|
148 |
/*
|
149 |
* handle DHCP/BOOTP
|
150 |
*/
|
151 |
if (ntohs(uh->uh_dport) == BOOTP_SERVER) {
|
152 |
bootp_input(m); |
153 |
goto bad;
|
154 |
} |
155 |
|
156 |
/*
|
157 |
* handle TFTP
|
158 |
*/
|
159 |
if (ntohs(uh->uh_dport) == TFTP_SERVER) {
|
160 |
tftp_input(m); |
161 |
goto bad;
|
162 |
} |
163 |
|
164 |
/*
|
165 |
* Locate pcb for datagram.
|
166 |
*/
|
167 |
so = udp_last_so; |
168 |
if (so->so_lport != uh->uh_sport ||
|
169 |
so->so_laddr.s_addr != ip->ip_src.s_addr) { |
170 |
struct socket *tmp;
|
171 |
|
172 |
for (tmp = udb.so_next; tmp != &udb; tmp = tmp->so_next) {
|
173 |
if (tmp->so_lport == uh->uh_sport &&
|
174 |
tmp->so_laddr.s_addr == ip->ip_src.s_addr) { |
175 |
tmp->so_faddr.s_addr = ip->ip_dst.s_addr; |
176 |
tmp->so_fport = uh->uh_dport; |
177 |
so = tmp; |
178 |
break;
|
179 |
} |
180 |
} |
181 |
if (tmp == &udb) {
|
182 |
so = NULL;
|
183 |
} else {
|
184 |
udpstat.udpps_pcbcachemiss++; |
185 |
udp_last_so = so; |
186 |
} |
187 |
} |
188 |
|
189 |
if (so == NULL) { |
190 |
/*
|
191 |
* If there's no socket for this packet,
|
192 |
* create one
|
193 |
*/
|
194 |
if ((so = socreate()) == NULL) goto bad; |
195 |
if(udp_attach(so) == -1) { |
196 |
DEBUG_MISC((dfd," udp_attach errno = %d-%s\n",
|
197 |
errno,strerror(errno))); |
198 |
sofree(so); |
199 |
goto bad;
|
200 |
} |
201 |
|
202 |
/*
|
203 |
* Setup fields
|
204 |
*/
|
205 |
/* udp_last_so = so; */
|
206 |
so->so_laddr = ip->ip_src; |
207 |
so->so_lport = uh->uh_sport; |
208 |
so->so_faddr = ip->ip_dst; /* XXX */
|
209 |
so->so_fport = uh->uh_dport; /* XXX */
|
210 |
|
211 |
if ((so->so_iptos = udp_tos(so)) == 0) |
212 |
so->so_iptos = ip->ip_tos; |
213 |
|
214 |
/*
|
215 |
* XXXXX Here, check if it's in udpexec_list,
|
216 |
* and if it is, do the fork_exec() etc.
|
217 |
*/
|
218 |
} |
219 |
|
220 |
iphlen += sizeof(struct udphdr); |
221 |
m->m_len -= iphlen; |
222 |
m->m_data += iphlen; |
223 |
|
224 |
/*
|
225 |
* Now we sendto() the packet.
|
226 |
*/
|
227 |
if (so->so_emu)
|
228 |
udp_emu(so, m); |
229 |
|
230 |
if(sosendto(so,m) == -1) { |
231 |
m->m_len += iphlen; |
232 |
m->m_data -= iphlen; |
233 |
*ip=save_ip; |
234 |
DEBUG_MISC((dfd,"udp tx errno = %d-%s\n",errno,strerror(errno)));
|
235 |
icmp_error(m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
|
236 |
} |
237 |
|
238 |
m_free(so->so_m); /* used for ICMP if error on sorecvfrom */
|
239 |
|
240 |
/* restore the orig mbuf packet */
|
241 |
m->m_len += iphlen; |
242 |
m->m_data -= iphlen; |
243 |
*ip=save_ip; |
244 |
so->so_m=m; /* ICMP backup */
|
245 |
|
246 |
return;
|
247 |
bad:
|
248 |
m_freem(m); |
249 |
/* if (opts) m_freem(opts); */
|
250 |
return;
|
251 |
} |
252 |
|
253 |
int udp_output2(struct socket *so, struct mbuf *m, |
254 |
struct sockaddr_in *saddr, struct sockaddr_in *daddr, |
255 |
int iptos)
|
256 |
{ |
257 |
register struct udpiphdr *ui; |
258 |
int error = 0; |
259 |
|
260 |
DEBUG_CALL("udp_output");
|
261 |
DEBUG_ARG("so = %lx", (long)so); |
262 |
DEBUG_ARG("m = %lx", (long)m); |
263 |
DEBUG_ARG("saddr = %lx", (long)saddr->sin_addr.s_addr); |
264 |
DEBUG_ARG("daddr = %lx", (long)daddr->sin_addr.s_addr); |
265 |
|
266 |
/*
|
267 |
* Adjust for header
|
268 |
*/
|
269 |
m->m_data -= sizeof(struct udpiphdr); |
270 |
m->m_len += sizeof(struct udpiphdr); |
271 |
|
272 |
/*
|
273 |
* Fill in mbuf with extended UDP header
|
274 |
* and addresses and length put into network format.
|
275 |
*/
|
276 |
ui = mtod(m, struct udpiphdr *);
|
277 |
ui->ui_next = ui->ui_prev = 0;
|
278 |
ui->ui_x1 = 0;
|
279 |
ui->ui_pr = IPPROTO_UDP; |
280 |
ui->ui_len = htons(m->m_len - sizeof(struct ip)); /* + sizeof (struct udphdr)); */ |
281 |
/* XXXXX Check for from-one-location sockets, or from-any-location sockets */
|
282 |
ui->ui_src = saddr->sin_addr; |
283 |
ui->ui_dst = daddr->sin_addr; |
284 |
ui->ui_sport = saddr->sin_port; |
285 |
ui->ui_dport = daddr->sin_port; |
286 |
ui->ui_ulen = ui->ui_len; |
287 |
|
288 |
/*
|
289 |
* Stuff checksum and output datagram.
|
290 |
*/
|
291 |
ui->ui_sum = 0;
|
292 |
if (udpcksum) {
|
293 |
if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ m->m_len)) == 0) |
294 |
ui->ui_sum = 0xffff;
|
295 |
} |
296 |
((struct ip *)ui)->ip_len = m->m_len;
|
297 |
|
298 |
((struct ip *)ui)->ip_ttl = ip_defttl;
|
299 |
((struct ip *)ui)->ip_tos = iptos;
|
300 |
|
301 |
udpstat.udps_opackets++; |
302 |
|
303 |
error = ip_output(so, m); |
304 |
|
305 |
return (error);
|
306 |
} |
307 |
|
308 |
int udp_output(struct socket *so, struct mbuf *m, |
309 |
struct sockaddr_in *addr)
|
310 |
|
311 |
{ |
312 |
struct sockaddr_in saddr, daddr;
|
313 |
|
314 |
saddr = *addr; |
315 |
if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) |
316 |
saddr.sin_addr.s_addr = so->so_faddr.s_addr; |
317 |
daddr.sin_addr = so->so_laddr; |
318 |
daddr.sin_port = so->so_lport; |
319 |
|
320 |
return udp_output2(so, m, &saddr, &daddr, so->so_iptos);
|
321 |
} |
322 |
|
323 |
int
|
324 |
udp_attach(so) |
325 |
struct socket *so;
|
326 |
{ |
327 |
struct sockaddr_in addr;
|
328 |
|
329 |
if((so->s = socket(AF_INET,SOCK_DGRAM,0)) != -1) { |
330 |
/*
|
331 |
* Here, we bind() the socket. Although not really needed
|
332 |
* (sendto() on an unbound socket will bind it), it's done
|
333 |
* here so that emulation of ytalk etc. don't have to do it
|
334 |
*/
|
335 |
addr.sin_family = AF_INET; |
336 |
addr.sin_port = 0;
|
337 |
addr.sin_addr.s_addr = INADDR_ANY; |
338 |
if(bind(so->s, (struct sockaddr *)&addr, sizeof(addr))<0) { |
339 |
int lasterrno=errno;
|
340 |
closesocket(so->s); |
341 |
so->s=-1;
|
342 |
errno=lasterrno; |
343 |
} else {
|
344 |
/* success, insert in queue */
|
345 |
so->so_expire = curtime + SO_EXPIRE; |
346 |
insque(so,&udb); |
347 |
} |
348 |
} |
349 |
return(so->s);
|
350 |
} |
351 |
|
352 |
void
|
353 |
udp_detach(so) |
354 |
struct socket *so;
|
355 |
{ |
356 |
closesocket(so->s); |
357 |
/* if (so->so_m) m_free(so->so_m); done by sofree */
|
358 |
|
359 |
sofree(so); |
360 |
} |
361 |
|
362 |
struct tos_t udptos[] = {
|
363 |
{0, 53, IPTOS_LOWDELAY, 0}, /* DNS */ |
364 |
{517, 517, IPTOS_LOWDELAY, EMU_TALK}, /* talk */ |
365 |
{518, 518, IPTOS_LOWDELAY, EMU_NTALK}, /* ntalk */ |
366 |
{0, 7648, IPTOS_LOWDELAY, EMU_CUSEEME}, /* Cu-Seeme */ |
367 |
{0, 0, 0, 0} |
368 |
}; |
369 |
|
370 |
u_int8_t |
371 |
udp_tos(so) |
372 |
struct socket *so;
|
373 |
{ |
374 |
int i = 0; |
375 |
|
376 |
while(udptos[i].tos) {
|
377 |
if ((udptos[i].fport && ntohs(so->so_fport) == udptos[i].fport) ||
|
378 |
(udptos[i].lport && ntohs(so->so_lport) == udptos[i].lport)) { |
379 |
so->so_emu = udptos[i].emu; |
380 |
return udptos[i].tos;
|
381 |
} |
382 |
i++; |
383 |
} |
384 |
|
385 |
return 0; |
386 |
} |
387 |
|
388 |
#ifdef EMULATE_TALK
|
389 |
#include "talkd.h" |
390 |
#endif
|
391 |
|
392 |
/*
|
393 |
* Here, talk/ytalk/ntalk requests must be emulated
|
394 |
*/
|
395 |
void
|
396 |
udp_emu(so, m) |
397 |
struct socket *so;
|
398 |
struct mbuf *m;
|
399 |
{ |
400 |
struct sockaddr_in addr;
|
401 |
int addrlen = sizeof(addr); |
402 |
#ifdef EMULATE_TALK
|
403 |
CTL_MSG_OLD *omsg; |
404 |
CTL_MSG *nmsg; |
405 |
char buff[sizeof(CTL_MSG)]; |
406 |
u_char type; |
407 |
|
408 |
struct talk_request {
|
409 |
struct talk_request *next;
|
410 |
struct socket *udp_so;
|
411 |
struct socket *tcp_so;
|
412 |
} *req; |
413 |
|
414 |
static struct talk_request *req_tbl = 0; |
415 |
|
416 |
#endif
|
417 |
|
418 |
struct cu_header {
|
419 |
char dest[8]; |
420 |
short family;
|
421 |
u_short port; |
422 |
u_long addr; |
423 |
} *cu_head; |
424 |
|
425 |
switch(so->so_emu) {
|
426 |
|
427 |
#ifdef EMULATE_TALK
|
428 |
case EMU_TALK:
|
429 |
case EMU_NTALK:
|
430 |
/*
|
431 |
* Talk emulation. We always change the ctl_addr to get
|
432 |
* some answers from the daemon. When an ANNOUNCE comes,
|
433 |
* we send LEAVE_INVITE to the local daemons. Also when a
|
434 |
* DELETE comes, we send copies to the local daemons.
|
435 |
*/
|
436 |
if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0) |
437 |
return;
|
438 |
|
439 |
#define IS_OLD (so->so_emu == EMU_TALK)
|
440 |
|
441 |
#define COPY_MSG(dest, src) { dest->type = src->type; \
|
442 |
dest->id_num = src->id_num; \ |
443 |
dest->pid = src->pid; \ |
444 |
dest->addr = src->addr; \ |
445 |
dest->ctl_addr = src->ctl_addr; \ |
446 |
memcpy(&dest->l_name, &src->l_name, NAME_SIZE_OLD); \ |
447 |
memcpy(&dest->r_name, &src->r_name, NAME_SIZE_OLD); \ |
448 |
memcpy(&dest->r_tty, &src->r_tty, TTY_SIZE); } |
449 |
|
450 |
#define OTOSIN(ptr, field) ((struct sockaddr_in *)&ptr->field) |
451 |
/* old_sockaddr to sockaddr_in */
|
452 |
|
453 |
|
454 |
if (IS_OLD) { /* old talk */ |
455 |
omsg = mtod(m, CTL_MSG_OLD*); |
456 |
nmsg = (CTL_MSG *) buff; |
457 |
type = omsg->type; |
458 |
OTOSIN(omsg, ctl_addr)->sin_port = addr.sin_port; |
459 |
OTOSIN(omsg, ctl_addr)->sin_addr = our_addr; |
460 |
strncpy(omsg->l_name, getlogin(), NAME_SIZE_OLD); |
461 |
} else { /* new talk */ |
462 |
omsg = (CTL_MSG_OLD *) buff; |
463 |
nmsg = mtod(m, CTL_MSG *); |
464 |
type = nmsg->type; |
465 |
OTOSIN(nmsg, ctl_addr)->sin_port = addr.sin_port; |
466 |
OTOSIN(nmsg, ctl_addr)->sin_addr = our_addr; |
467 |
strncpy(nmsg->l_name, getlogin(), NAME_SIZE_OLD); |
468 |
} |
469 |
|
470 |
if (type == LOOK_UP)
|
471 |
return; /* for LOOK_UP this is enough */ |
472 |
|
473 |
if (IS_OLD) { /* make a copy of the message */ |
474 |
COPY_MSG(nmsg, omsg); |
475 |
nmsg->vers = 1;
|
476 |
nmsg->answer = 0;
|
477 |
} else
|
478 |
COPY_MSG(omsg, nmsg); |
479 |
|
480 |
/*
|
481 |
* If if is an ANNOUNCE message, we go through the
|
482 |
* request table to see if a tcp port has already
|
483 |
* been redirected for this socket. If not, we solisten()
|
484 |
* a new socket and add this entry to the table.
|
485 |
* The port number of the tcp socket and our IP
|
486 |
* are put to the addr field of the message structures.
|
487 |
* Then a LEAVE_INVITE is sent to both local daemon
|
488 |
* ports, 517 and 518. This is why we have two copies
|
489 |
* of the message, one in old talk and one in new talk
|
490 |
* format.
|
491 |
*/
|
492 |
|
493 |
if (type == ANNOUNCE) {
|
494 |
int s;
|
495 |
u_short temp_port; |
496 |
|
497 |
for(req = req_tbl; req; req = req->next)
|
498 |
if (so == req->udp_so)
|
499 |
break; /* found it */ |
500 |
|
501 |
if (!req) { /* no entry for so, create new */ |
502 |
req = (struct talk_request *)
|
503 |
malloc(sizeof(struct talk_request)); |
504 |
req->udp_so = so; |
505 |
req->tcp_so = solisten(0,
|
506 |
OTOSIN(omsg, addr)->sin_addr.s_addr, |
507 |
OTOSIN(omsg, addr)->sin_port, |
508 |
SS_FACCEPTONCE); |
509 |
req->next = req_tbl; |
510 |
req_tbl = req; |
511 |
} |
512 |
|
513 |
/* replace port number in addr field */
|
514 |
addrlen = sizeof(addr);
|
515 |
getsockname(req->tcp_so->s, |
516 |
(struct sockaddr *) &addr,
|
517 |
&addrlen); |
518 |
OTOSIN(omsg, addr)->sin_port = addr.sin_port; |
519 |
OTOSIN(omsg, addr)->sin_addr = our_addr; |
520 |
OTOSIN(nmsg, addr)->sin_port = addr.sin_port; |
521 |
OTOSIN(nmsg, addr)->sin_addr = our_addr; |
522 |
|
523 |
/* send LEAVE_INVITEs */
|
524 |
temp_port = OTOSIN(omsg, ctl_addr)->sin_port; |
525 |
OTOSIN(omsg, ctl_addr)->sin_port = 0;
|
526 |
OTOSIN(nmsg, ctl_addr)->sin_port = 0;
|
527 |
omsg->type = nmsg->type = LEAVE_INVITE; |
528 |
|
529 |
s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP); |
530 |
addr.sin_addr = our_addr; |
531 |
addr.sin_family = AF_INET; |
532 |
addr.sin_port = htons(517);
|
533 |
sendto(s, (char *)omsg, sizeof(*omsg), 0, |
534 |
(struct sockaddr *)&addr, sizeof(addr)); |
535 |
addr.sin_port = htons(518);
|
536 |
sendto(s, (char *)nmsg, sizeof(*nmsg), 0, |
537 |
(struct sockaddr *) &addr, sizeof(addr)); |
538 |
closesocket(s) ; |
539 |
|
540 |
omsg->type = nmsg->type = ANNOUNCE; |
541 |
OTOSIN(omsg, ctl_addr)->sin_port = temp_port; |
542 |
OTOSIN(nmsg, ctl_addr)->sin_port = temp_port; |
543 |
} |
544 |
|
545 |
/*
|
546 |
* If it is a DELETE message, we send a copy to the
|
547 |
* local daemons. Then we delete the entry corresponding
|
548 |
* to our socket from the request table.
|
549 |
*/
|
550 |
|
551 |
if (type == DELETE) {
|
552 |
struct talk_request *temp_req, *req_next;
|
553 |
int s;
|
554 |
u_short temp_port; |
555 |
|
556 |
temp_port = OTOSIN(omsg, ctl_addr)->sin_port; |
557 |
OTOSIN(omsg, ctl_addr)->sin_port = 0;
|
558 |
OTOSIN(nmsg, ctl_addr)->sin_port = 0;
|
559 |
|
560 |
s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP); |
561 |
addr.sin_addr = our_addr; |
562 |
addr.sin_family = AF_INET; |
563 |
addr.sin_port = htons(517);
|
564 |
sendto(s, (char *)omsg, sizeof(*omsg), 0, |
565 |
(struct sockaddr *)&addr, sizeof(addr)); |
566 |
addr.sin_port = htons(518);
|
567 |
sendto(s, (char *)nmsg, sizeof(*nmsg), 0, |
568 |
(struct sockaddr *)&addr, sizeof(addr)); |
569 |
closesocket(s); |
570 |
|
571 |
OTOSIN(omsg, ctl_addr)->sin_port = temp_port; |
572 |
OTOSIN(nmsg, ctl_addr)->sin_port = temp_port; |
573 |
|
574 |
/* delete table entry */
|
575 |
if (so == req_tbl->udp_so) {
|
576 |
temp_req = req_tbl; |
577 |
req_tbl = req_tbl->next; |
578 |
free(temp_req); |
579 |
} else {
|
580 |
temp_req = req_tbl; |
581 |
for(req = req_tbl->next; req; req = req_next) {
|
582 |
req_next = req->next; |
583 |
if (so == req->udp_so) {
|
584 |
temp_req->next = req_next; |
585 |
free(req); |
586 |
break;
|
587 |
} else {
|
588 |
temp_req = req; |
589 |
} |
590 |
} |
591 |
} |
592 |
} |
593 |
|
594 |
return;
|
595 |
#endif
|
596 |
|
597 |
case EMU_CUSEEME:
|
598 |
|
599 |
/*
|
600 |
* Cu-SeeMe emulation.
|
601 |
* Hopefully the packet is more that 16 bytes long. We don't
|
602 |
* do any other tests, just replace the address and port
|
603 |
* fields.
|
604 |
*/
|
605 |
if (m->m_len >= sizeof (*cu_head)) { |
606 |
if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0) |
607 |
return;
|
608 |
cu_head = mtod(m, struct cu_header *);
|
609 |
cu_head->port = addr.sin_port; |
610 |
cu_head->addr = (u_long) our_addr.s_addr; |
611 |
} |
612 |
|
613 |
return;
|
614 |
} |
615 |
} |
616 |
|
617 |
struct socket *
|
618 |
udp_listen(port, laddr, lport, flags) |
619 |
u_int port; |
620 |
u_int32_t laddr; |
621 |
u_int lport; |
622 |
int flags;
|
623 |
{ |
624 |
struct sockaddr_in addr;
|
625 |
struct socket *so;
|
626 |
int addrlen = sizeof(struct sockaddr_in), opt = 1; |
627 |
|
628 |
if ((so = socreate()) == NULL) { |
629 |
free(so); |
630 |
return NULL; |
631 |
} |
632 |
so->s = socket(AF_INET,SOCK_DGRAM,0);
|
633 |
so->so_expire = curtime + SO_EXPIRE; |
634 |
insque(so,&udb); |
635 |
|
636 |
addr.sin_family = AF_INET; |
637 |
addr.sin_addr.s_addr = INADDR_ANY; |
638 |
addr.sin_port = port; |
639 |
|
640 |
if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0) { |
641 |
udp_detach(so); |
642 |
return NULL; |
643 |
} |
644 |
setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int)); |
645 |
/* setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int)); */
|
646 |
|
647 |
getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
|
648 |
so->so_fport = addr.sin_port; |
649 |
if (addr.sin_addr.s_addr == 0 || addr.sin_addr.s_addr == loopback_addr.s_addr) |
650 |
so->so_faddr = our_addr; |
651 |
else
|
652 |
so->so_faddr = addr.sin_addr; |
653 |
|
654 |
so->so_lport = lport; |
655 |
so->so_laddr.s_addr = laddr; |
656 |
if (flags != SS_FACCEPTONCE)
|
657 |
so->so_expire = 0;
|
658 |
|
659 |
so->so_state = SS_ISFCONNECTED; |
660 |
|
661 |
return so;
|
662 |
} |