1 |
/* |
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* Copyright (c) 1982, 1986, 1988, 1990, 1993 |
3 |
* The Regents of the University of California. All rights reserved. |
4 |
* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. All advertising materials mentioning features or use of this software |
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* must display the following acknowledgement: |
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* This product includes software developed by the University of |
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* California, Berkeley and its contributors. |
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* 4. Neither the name of the University nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* |
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* @(#)udp_usrreq.c 8.4 (Berkeley) 1/21/94 |
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* udp_usrreq.c,v 1.4 1994/10/02 17:48:45 phk Exp |
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*/ |
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|
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/* |
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* Changes and additions relating to SLiRP |
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* Copyright (c) 1995 Danny Gasparovski. |
40 |
* |
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* Please read the file COPYRIGHT for the |
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* terms and conditions of the copyright. |
43 |
*/ |
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|
45 |
#include <slirp.h> |
46 |
#include "ip_icmp.h" |
47 |
|
48 |
struct udpstat udpstat; |
49 |
|
50 |
struct socket udb; |
51 |
|
52 |
/* |
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* 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 |
{ |
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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;*/ |
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int len; |
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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, |
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* 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 |
/* |
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* 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 |
/* |
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* 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) { |
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udpstat.udps_badlen++; |
117 |
goto bad; |
118 |
} |
119 |
m_adj(m, len - ip->ip_len); |
120 |
ip->ip_len = len; |
121 |
} |
122 |
|
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/* |
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 |
|
209 |
if ((so->so_iptos = udp_tos(so)) == 0) |
210 |
so->so_iptos = ip->ip_tos; |
211 |
|
212 |
/* |
213 |
* XXXXX Here, check if it's in udpexec_list, |
214 |
* and if it is, do the fork_exec() etc. |
215 |
*/ |
216 |
} |
217 |
|
218 |
so->so_faddr = ip->ip_dst; /* XXX */ |
219 |
so->so_fport = uh->uh_dport; /* XXX */ |
220 |
|
221 |
iphlen += sizeof(struct udphdr); |
222 |
m->m_len -= iphlen; |
223 |
m->m_data += iphlen; |
224 |
|
225 |
/* |
226 |
* Now we sendto() the packet. |
227 |
*/ |
228 |
if (so->so_emu) |
229 |
udp_emu(so, m); |
230 |
|
231 |
if(sosendto(so,m) == -1) { |
232 |
m->m_len += iphlen; |
233 |
m->m_data -= iphlen; |
234 |
*ip=save_ip; |
235 |
DEBUG_MISC((dfd,"udp tx errno = %d-%s\n",errno,strerror(errno))); |
236 |
icmp_error(m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno)); |
237 |
} |
238 |
|
239 |
m_free(so->so_m); /* used for ICMP if error on sorecvfrom */ |
240 |
|
241 |
/* restore the orig mbuf packet */ |
242 |
m->m_len += iphlen; |
243 |
m->m_data -= iphlen; |
244 |
*ip=save_ip; |
245 |
so->so_m=m; /* ICMP backup */ |
246 |
|
247 |
return; |
248 |
bad: |
249 |
m_freem(m); |
250 |
/* if (opts) m_freem(opts); */ |
251 |
return; |
252 |
} |
253 |
|
254 |
int udp_output2(struct socket *so, struct mbuf *m, |
255 |
struct sockaddr_in *saddr, struct sockaddr_in *daddr, |
256 |
int iptos) |
257 |
{ |
258 |
register struct udpiphdr *ui; |
259 |
int error = 0; |
260 |
|
261 |
DEBUG_CALL("udp_output"); |
262 |
DEBUG_ARG("so = %lx", (long)so); |
263 |
DEBUG_ARG("m = %lx", (long)m); |
264 |
DEBUG_ARG("saddr = %lx", (long)saddr->sin_addr.s_addr); |
265 |
DEBUG_ARG("daddr = %lx", (long)daddr->sin_addr.s_addr); |
266 |
|
267 |
/* |
268 |
* Adjust for header |
269 |
*/ |
270 |
m->m_data -= sizeof(struct udpiphdr); |
271 |
m->m_len += sizeof(struct udpiphdr); |
272 |
|
273 |
/* |
274 |
* Fill in mbuf with extended UDP header |
275 |
* and addresses and length put into network format. |
276 |
*/ |
277 |
ui = mtod(m, struct udpiphdr *); |
278 |
ui->ui_next = ui->ui_prev = 0; |
279 |
ui->ui_x1 = 0; |
280 |
ui->ui_pr = IPPROTO_UDP; |
281 |
ui->ui_len = htons(m->m_len - sizeof(struct ip)); /* + sizeof (struct udphdr)); */ |
282 |
/* XXXXX Check for from-one-location sockets, or from-any-location sockets */ |
283 |
ui->ui_src = saddr->sin_addr; |
284 |
ui->ui_dst = daddr->sin_addr; |
285 |
ui->ui_sport = saddr->sin_port; |
286 |
ui->ui_dport = daddr->sin_port; |
287 |
ui->ui_ulen = ui->ui_len; |
288 |
|
289 |
/* |
290 |
* Stuff checksum and output datagram. |
291 |
*/ |
292 |
ui->ui_sum = 0; |
293 |
if (udpcksum) { |
294 |
if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ m->m_len)) == 0) |
295 |
ui->ui_sum = 0xffff; |
296 |
} |
297 |
((struct ip *)ui)->ip_len = m->m_len; |
298 |
|
299 |
((struct ip *)ui)->ip_ttl = ip_defttl; |
300 |
((struct ip *)ui)->ip_tos = iptos; |
301 |
|
302 |
udpstat.udps_opackets++; |
303 |
|
304 |
error = ip_output(so, m); |
305 |
|
306 |
return (error); |
307 |
} |
308 |
|
309 |
int udp_output(struct socket *so, struct mbuf *m, |
310 |
struct sockaddr_in *addr) |
311 |
|
312 |
{ |
313 |
struct sockaddr_in saddr, daddr; |
314 |
|
315 |
saddr = *addr; |
316 |
if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) { |
317 |
saddr.sin_addr.s_addr = so->so_faddr.s_addr; |
318 |
if ((so->so_faddr.s_addr & htonl(0x000000ff)) == htonl(0xff)) |
319 |
saddr.sin_addr.s_addr = alias_addr.s_addr; |
320 |
} |
321 |
daddr.sin_addr = so->so_laddr; |
322 |
daddr.sin_port = so->so_lport; |
323 |
|
324 |
return udp_output2(so, m, &saddr, &daddr, so->so_iptos); |
325 |
} |
326 |
|
327 |
int |
328 |
udp_attach(so) |
329 |
struct socket *so; |
330 |
{ |
331 |
struct sockaddr_in addr; |
332 |
|
333 |
if((so->s = socket(AF_INET,SOCK_DGRAM,0)) != -1) { |
334 |
/* |
335 |
* Here, we bind() the socket. Although not really needed |
336 |
* (sendto() on an unbound socket will bind it), it's done |
337 |
* here so that emulation of ytalk etc. don't have to do it |
338 |
*/ |
339 |
addr.sin_family = AF_INET; |
340 |
addr.sin_port = 0; |
341 |
addr.sin_addr.s_addr = INADDR_ANY; |
342 |
if(bind(so->s, (struct sockaddr *)&addr, sizeof(addr))<0) { |
343 |
int lasterrno=errno; |
344 |
closesocket(so->s); |
345 |
so->s=-1; |
346 |
#ifdef _WIN32 |
347 |
WSASetLastError(lasterrno); |
348 |
#else |
349 |
errno=lasterrno; |
350 |
#endif |
351 |
} else { |
352 |
/* success, insert in queue */ |
353 |
so->so_expire = curtime + SO_EXPIRE; |
354 |
insque(so,&udb); |
355 |
} |
356 |
} |
357 |
return(so->s); |
358 |
} |
359 |
|
360 |
void |
361 |
udp_detach(so) |
362 |
struct socket *so; |
363 |
{ |
364 |
closesocket(so->s); |
365 |
/* if (so->so_m) m_free(so->so_m); done by sofree */ |
366 |
|
367 |
sofree(so); |
368 |
} |
369 |
|
370 |
struct tos_t udptos[] = { |
371 |
{0, 53, IPTOS_LOWDELAY, 0}, /* DNS */ |
372 |
{517, 517, IPTOS_LOWDELAY, EMU_TALK}, /* talk */ |
373 |
{518, 518, IPTOS_LOWDELAY, EMU_NTALK}, /* ntalk */ |
374 |
{0, 7648, IPTOS_LOWDELAY, EMU_CUSEEME}, /* Cu-Seeme */ |
375 |
{0, 0, 0, 0} |
376 |
}; |
377 |
|
378 |
u_int8_t |
379 |
udp_tos(so) |
380 |
struct socket *so; |
381 |
{ |
382 |
int i = 0; |
383 |
|
384 |
while(udptos[i].tos) { |
385 |
if ((udptos[i].fport && ntohs(so->so_fport) == udptos[i].fport) || |
386 |
(udptos[i].lport && ntohs(so->so_lport) == udptos[i].lport)) { |
387 |
so->so_emu = udptos[i].emu; |
388 |
return udptos[i].tos; |
389 |
} |
390 |
i++; |
391 |
} |
392 |
|
393 |
return 0; |
394 |
} |
395 |
|
396 |
#ifdef EMULATE_TALK |
397 |
#include "talkd.h" |
398 |
#endif |
399 |
|
400 |
/* |
401 |
* Here, talk/ytalk/ntalk requests must be emulated |
402 |
*/ |
403 |
void |
404 |
udp_emu(so, m) |
405 |
struct socket *so; |
406 |
struct mbuf *m; |
407 |
{ |
408 |
struct sockaddr_in addr; |
409 |
socklen_t addrlen = sizeof(addr); |
410 |
#ifdef EMULATE_TALK |
411 |
CTL_MSG_OLD *omsg; |
412 |
CTL_MSG *nmsg; |
413 |
char buff[sizeof(CTL_MSG)]; |
414 |
u_char type; |
415 |
|
416 |
struct talk_request { |
417 |
struct talk_request *next; |
418 |
struct socket *udp_so; |
419 |
struct socket *tcp_so; |
420 |
} *req; |
421 |
|
422 |
static struct talk_request *req_tbl = 0; |
423 |
|
424 |
#endif |
425 |
|
426 |
struct cu_header { |
427 |
uint16_t d_family; // destination family |
428 |
uint16_t d_port; // destination port |
429 |
uint32_t d_addr; // destination address |
430 |
uint16_t s_family; // source family |
431 |
uint16_t s_port; // source port |
432 |
uint32_t so_addr; // source address |
433 |
uint32_t seqn; // sequence number |
434 |
uint16_t message; // message |
435 |
uint16_t data_type; // data type |
436 |
uint16_t pkt_len; // packet length |
437 |
} *cu_head; |
438 |
|
439 |
switch(so->so_emu) { |
440 |
|
441 |
#ifdef EMULATE_TALK |
442 |
case EMU_TALK: |
443 |
case EMU_NTALK: |
444 |
/* |
445 |
* Talk emulation. We always change the ctl_addr to get |
446 |
* some answers from the daemon. When an ANNOUNCE comes, |
447 |
* we send LEAVE_INVITE to the local daemons. Also when a |
448 |
* DELETE comes, we send copies to the local daemons. |
449 |
*/ |
450 |
if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0) |
451 |
return; |
452 |
|
453 |
#define IS_OLD (so->so_emu == EMU_TALK) |
454 |
|
455 |
#define COPY_MSG(dest, src) { dest->type = src->type; \ |
456 |
dest->id_num = src->id_num; \ |
457 |
dest->pid = src->pid; \ |
458 |
dest->addr = src->addr; \ |
459 |
dest->ctl_addr = src->ctl_addr; \ |
460 |
memcpy(&dest->l_name, &src->l_name, NAME_SIZE_OLD); \ |
461 |
memcpy(&dest->r_name, &src->r_name, NAME_SIZE_OLD); \ |
462 |
memcpy(&dest->r_tty, &src->r_tty, TTY_SIZE); } |
463 |
|
464 |
#define OTOSIN(ptr, field) ((struct sockaddr_in *)&ptr->field) |
465 |
/* old_sockaddr to sockaddr_in */ |
466 |
|
467 |
|
468 |
if (IS_OLD) { /* old talk */ |
469 |
omsg = mtod(m, CTL_MSG_OLD*); |
470 |
nmsg = (CTL_MSG *) buff; |
471 |
type = omsg->type; |
472 |
OTOSIN(omsg, ctl_addr)->sin_port = addr.sin_port; |
473 |
OTOSIN(omsg, ctl_addr)->sin_addr = our_addr; |
474 |
strncpy(omsg->l_name, getlogin(), NAME_SIZE_OLD); |
475 |
} else { /* new talk */ |
476 |
omsg = (CTL_MSG_OLD *) buff; |
477 |
nmsg = mtod(m, CTL_MSG *); |
478 |
type = nmsg->type; |
479 |
OTOSIN(nmsg, ctl_addr)->sin_port = addr.sin_port; |
480 |
OTOSIN(nmsg, ctl_addr)->sin_addr = our_addr; |
481 |
strncpy(nmsg->l_name, getlogin(), NAME_SIZE_OLD); |
482 |
} |
483 |
|
484 |
if (type == LOOK_UP) |
485 |
return; /* for LOOK_UP this is enough */ |
486 |
|
487 |
if (IS_OLD) { /* make a copy of the message */ |
488 |
COPY_MSG(nmsg, omsg); |
489 |
nmsg->vers = 1; |
490 |
nmsg->answer = 0; |
491 |
} else |
492 |
COPY_MSG(omsg, nmsg); |
493 |
|
494 |
/* |
495 |
* If if is an ANNOUNCE message, we go through the |
496 |
* request table to see if a tcp port has already |
497 |
* been redirected for this socket. If not, we solisten() |
498 |
* a new socket and add this entry to the table. |
499 |
* The port number of the tcp socket and our IP |
500 |
* are put to the addr field of the message structures. |
501 |
* Then a LEAVE_INVITE is sent to both local daemon |
502 |
* ports, 517 and 518. This is why we have two copies |
503 |
* of the message, one in old talk and one in new talk |
504 |
* format. |
505 |
*/ |
506 |
|
507 |
if (type == ANNOUNCE) { |
508 |
int s; |
509 |
u_short temp_port; |
510 |
|
511 |
for(req = req_tbl; req; req = req->next) |
512 |
if (so == req->udp_so) |
513 |
break; /* found it */ |
514 |
|
515 |
if (!req) { /* no entry for so, create new */ |
516 |
req = (struct talk_request *) |
517 |
malloc(sizeof(struct talk_request)); |
518 |
req->udp_so = so; |
519 |
req->tcp_so = solisten(0, |
520 |
OTOSIN(omsg, addr)->sin_addr.s_addr, |
521 |
OTOSIN(omsg, addr)->sin_port, |
522 |
SS_FACCEPTONCE); |
523 |
req->next = req_tbl; |
524 |
req_tbl = req; |
525 |
} |
526 |
|
527 |
/* replace port number in addr field */ |
528 |
addrlen = sizeof(addr); |
529 |
getsockname(req->tcp_so->s, |
530 |
(struct sockaddr *) &addr, |
531 |
&addrlen); |
532 |
OTOSIN(omsg, addr)->sin_port = addr.sin_port; |
533 |
OTOSIN(omsg, addr)->sin_addr = our_addr; |
534 |
OTOSIN(nmsg, addr)->sin_port = addr.sin_port; |
535 |
OTOSIN(nmsg, addr)->sin_addr = our_addr; |
536 |
|
537 |
/* send LEAVE_INVITEs */ |
538 |
temp_port = OTOSIN(omsg, ctl_addr)->sin_port; |
539 |
OTOSIN(omsg, ctl_addr)->sin_port = 0; |
540 |
OTOSIN(nmsg, ctl_addr)->sin_port = 0; |
541 |
omsg->type = nmsg->type = LEAVE_INVITE; |
542 |
|
543 |
s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP); |
544 |
addr.sin_addr = our_addr; |
545 |
addr.sin_family = AF_INET; |
546 |
addr.sin_port = htons(517); |
547 |
sendto(s, (char *)omsg, sizeof(*omsg), 0, |
548 |
(struct sockaddr *)&addr, sizeof(addr)); |
549 |
addr.sin_port = htons(518); |
550 |
sendto(s, (char *)nmsg, sizeof(*nmsg), 0, |
551 |
(struct sockaddr *) &addr, sizeof(addr)); |
552 |
closesocket(s) ; |
553 |
|
554 |
omsg->type = nmsg->type = ANNOUNCE; |
555 |
OTOSIN(omsg, ctl_addr)->sin_port = temp_port; |
556 |
OTOSIN(nmsg, ctl_addr)->sin_port = temp_port; |
557 |
} |
558 |
|
559 |
/* |
560 |
* If it is a DELETE message, we send a copy to the |
561 |
* local daemons. Then we delete the entry corresponding |
562 |
* to our socket from the request table. |
563 |
*/ |
564 |
|
565 |
if (type == DELETE) { |
566 |
struct talk_request *temp_req, *req_next; |
567 |
int s; |
568 |
u_short temp_port; |
569 |
|
570 |
temp_port = OTOSIN(omsg, ctl_addr)->sin_port; |
571 |
OTOSIN(omsg, ctl_addr)->sin_port = 0; |
572 |
OTOSIN(nmsg, ctl_addr)->sin_port = 0; |
573 |
|
574 |
s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP); |
575 |
addr.sin_addr = our_addr; |
576 |
addr.sin_family = AF_INET; |
577 |
addr.sin_port = htons(517); |
578 |
sendto(s, (char *)omsg, sizeof(*omsg), 0, |
579 |
(struct sockaddr *)&addr, sizeof(addr)); |
580 |
addr.sin_port = htons(518); |
581 |
sendto(s, (char *)nmsg, sizeof(*nmsg), 0, |
582 |
(struct sockaddr *)&addr, sizeof(addr)); |
583 |
closesocket(s); |
584 |
|
585 |
OTOSIN(omsg, ctl_addr)->sin_port = temp_port; |
586 |
OTOSIN(nmsg, ctl_addr)->sin_port = temp_port; |
587 |
|
588 |
/* delete table entry */ |
589 |
if (so == req_tbl->udp_so) { |
590 |
temp_req = req_tbl; |
591 |
req_tbl = req_tbl->next; |
592 |
free(temp_req); |
593 |
} else { |
594 |
temp_req = req_tbl; |
595 |
for(req = req_tbl->next; req; req = req_next) { |
596 |
req_next = req->next; |
597 |
if (so == req->udp_so) { |
598 |
temp_req->next = req_next; |
599 |
free(req); |
600 |
break; |
601 |
} else { |
602 |
temp_req = req; |
603 |
} |
604 |
} |
605 |
} |
606 |
} |
607 |
|
608 |
return; |
609 |
#endif |
610 |
|
611 |
case EMU_CUSEEME: |
612 |
|
613 |
/* |
614 |
* Cu-SeeMe emulation. |
615 |
* Hopefully the packet is more that 16 bytes long. We don't |
616 |
* do any other tests, just replace the address and port |
617 |
* fields. |
618 |
*/ |
619 |
if (m->m_len >= sizeof (*cu_head)) { |
620 |
if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0) |
621 |
return; |
622 |
cu_head = mtod(m, struct cu_header *); |
623 |
cu_head->s_port = addr.sin_port; |
624 |
cu_head->so_addr = our_addr.s_addr; |
625 |
} |
626 |
|
627 |
return; |
628 |
} |
629 |
} |
630 |
|
631 |
struct socket * |
632 |
udp_listen(port, laddr, lport, flags) |
633 |
u_int port; |
634 |
u_int32_t laddr; |
635 |
u_int lport; |
636 |
int flags; |
637 |
{ |
638 |
struct sockaddr_in addr; |
639 |
struct socket *so; |
640 |
socklen_t addrlen = sizeof(struct sockaddr_in); |
641 |
int opt = 1; |
642 |
|
643 |
if ((so = socreate()) == NULL) { |
644 |
free(so); |
645 |
return NULL; |
646 |
} |
647 |
so->s = socket(AF_INET,SOCK_DGRAM,0); |
648 |
so->so_expire = curtime + SO_EXPIRE; |
649 |
insque(so,&udb); |
650 |
|
651 |
addr.sin_family = AF_INET; |
652 |
addr.sin_addr.s_addr = INADDR_ANY; |
653 |
addr.sin_port = port; |
654 |
|
655 |
if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0) { |
656 |
udp_detach(so); |
657 |
return NULL; |
658 |
} |
659 |
setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int)); |
660 |
/* setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int)); */ |
661 |
|
662 |
getsockname(so->s,(struct sockaddr *)&addr,&addrlen); |
663 |
so->so_fport = addr.sin_port; |
664 |
if (addr.sin_addr.s_addr == 0 || addr.sin_addr.s_addr == loopback_addr.s_addr) |
665 |
so->so_faddr = alias_addr; |
666 |
else |
667 |
so->so_faddr = addr.sin_addr; |
668 |
|
669 |
so->so_lport = lport; |
670 |
so->so_laddr.s_addr = laddr; |
671 |
if (flags != SS_FACCEPTONCE) |
672 |
so->so_expire = 0; |
673 |
|
674 |
so->so_state = SS_ISFCONNECTED; |
675 |
|
676 |
return so; |
677 |
} |