]>
Commit | Line | Data |
---|---|---|
f0cbd3ec FB |
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. | |
2f5f8996 | 13 | * 3. Neither the name of the University nor the names of its contributors |
f0cbd3ec FB |
14 | * may be used to endorse or promote products derived from this software |
15 | * without specific prior written permission. | |
16 | * | |
17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
27 | * SUCH DAMAGE. | |
28 | * | |
29 | * @(#)udp_usrreq.c 8.4 (Berkeley) 1/21/94 | |
30 | * udp_usrreq.c,v 1.4 1994/10/02 17:48:45 phk Exp | |
31 | */ | |
32 | ||
33 | /* | |
34 | * Changes and additions relating to SLiRP | |
35 | * Copyright (c) 1995 Danny Gasparovski. | |
5fafdf24 TS |
36 | * |
37 | * Please read the file COPYRIGHT for the | |
f0cbd3ec FB |
38 | * terms and conditions of the copyright. |
39 | */ | |
40 | ||
41 | #include <slirp.h> | |
42 | #include "ip_icmp.h" | |
43 | ||
31a60e22 | 44 | #ifdef LOG_ENABLED |
f0cbd3ec | 45 | struct udpstat udpstat; |
31a60e22 | 46 | #endif |
f0cbd3ec FB |
47 | |
48 | struct socket udb; | |
49 | ||
9634d903 BS |
50 | static u_int8_t udp_tos(struct socket *so); |
51 | static void udp_emu(struct socket *so, struct mbuf *m); | |
52 | ||
f0cbd3ec FB |
53 | struct socket *udp_last_so = &udb; |
54 | ||
55 | void | |
aeed97c4 | 56 | udp_init(void) |
f0cbd3ec FB |
57 | { |
58 | udb.so_next = udb.so_prev = &udb; | |
59 | } | |
5fafdf24 TS |
60 | /* m->m_data points at ip packet header |
61 | * m->m_len length ip packet | |
f0cbd3ec FB |
62 | * ip->ip_len length data (IPDU) |
63 | */ | |
64 | void | |
aeed97c4 | 65 | udp_input(register struct mbuf *m, int iphlen) |
f0cbd3ec FB |
66 | { |
67 | register struct ip *ip; | |
68 | register struct udphdr *uh; | |
f0cbd3ec | 69 | int len; |
5fafdf24 | 70 | struct ip save_ip; |
f0cbd3ec | 71 | struct socket *so; |
5fafdf24 | 72 | |
f0cbd3ec FB |
73 | DEBUG_CALL("udp_input"); |
74 | DEBUG_ARG("m = %lx", (long)m); | |
75 | DEBUG_ARG("iphlen = %d", iphlen); | |
5fafdf24 | 76 | |
31a60e22 | 77 | STAT(udpstat.udps_ipackets++); |
f0cbd3ec FB |
78 | |
79 | /* | |
80 | * Strip IP options, if any; should skip this, | |
81 | * make available to user, and use on returned packets, | |
82 | * but we don't yet have a way to check the checksum | |
83 | * with options still present. | |
84 | */ | |
85 | if(iphlen > sizeof(struct ip)) { | |
86 | ip_stripoptions(m, (struct mbuf *)0); | |
87 | iphlen = sizeof(struct ip); | |
88 | } | |
89 | ||
90 | /* | |
91 | * Get IP and UDP header together in first mbuf. | |
92 | */ | |
93 | ip = mtod(m, struct ip *); | |
94 | uh = (struct udphdr *)((caddr_t)ip + iphlen); | |
95 | ||
96 | /* | |
97 | * Make mbuf data length reflect UDP length. | |
98 | * If not enough data to reflect UDP length, drop. | |
99 | */ | |
100 | len = ntohs((u_int16_t)uh->uh_ulen); | |
101 | ||
102 | if (ip->ip_len != len) { | |
103 | if (len > ip->ip_len) { | |
31a60e22 | 104 | STAT(udpstat.udps_badlen++); |
f0cbd3ec FB |
105 | goto bad; |
106 | } | |
107 | m_adj(m, len - ip->ip_len); | |
108 | ip->ip_len = len; | |
109 | } | |
5fafdf24 | 110 | |
f0cbd3ec FB |
111 | /* |
112 | * Save a copy of the IP header in case we want restore it | |
113 | * for sending an ICMP error message in response. | |
114 | */ | |
5fafdf24 | 115 | save_ip = *ip; |
f0cbd3ec FB |
116 | save_ip.ip_len+= iphlen; /* tcp_input subtracts this */ |
117 | ||
118 | /* | |
119 | * Checksum extended UDP header and data. | |
120 | */ | |
0d62c4cf | 121 | if (uh->uh_sum) { |
429d0a3d | 122 | memset(&((struct ipovly *)ip)->ih_mbuf, 0, sizeof(struct mbuf_ptr)); |
f0cbd3ec FB |
123 | ((struct ipovly *)ip)->ih_x1 = 0; |
124 | ((struct ipovly *)ip)->ih_len = uh->uh_ulen; | |
f0cbd3ec | 125 | if(cksum(m, len + sizeof(struct ip))) { |
31a60e22 | 126 | STAT(udpstat.udps_badsum++); |
f0cbd3ec FB |
127 | goto bad; |
128 | } | |
129 | } | |
130 | ||
131 | /* | |
132 | * handle DHCP/BOOTP | |
133 | */ | |
134 | if (ntohs(uh->uh_dport) == BOOTP_SERVER) { | |
135 | bootp_input(m); | |
136 | goto bad; | |
137 | } | |
138 | ||
a9ba3a85 AL |
139 | if (slirp_restrict) |
140 | goto bad; | |
141 | ||
c7f74643 FB |
142 | /* |
143 | * handle TFTP | |
144 | */ | |
145 | if (ntohs(uh->uh_dport) == TFTP_SERVER) { | |
146 | tftp_input(m); | |
147 | goto bad; | |
148 | } | |
149 | ||
f0cbd3ec FB |
150 | /* |
151 | * Locate pcb for datagram. | |
152 | */ | |
153 | so = udp_last_so; | |
154 | if (so->so_lport != uh->uh_sport || | |
155 | so->so_laddr.s_addr != ip->ip_src.s_addr) { | |
156 | struct socket *tmp; | |
3b46e624 | 157 | |
f0cbd3ec FB |
158 | for (tmp = udb.so_next; tmp != &udb; tmp = tmp->so_next) { |
159 | if (tmp->so_lport == uh->uh_sport && | |
160 | tmp->so_laddr.s_addr == ip->ip_src.s_addr) { | |
f0cbd3ec FB |
161 | so = tmp; |
162 | break; | |
163 | } | |
164 | } | |
165 | if (tmp == &udb) { | |
166 | so = NULL; | |
167 | } else { | |
31a60e22 | 168 | STAT(udpstat.udpps_pcbcachemiss++); |
f0cbd3ec FB |
169 | udp_last_so = so; |
170 | } | |
171 | } | |
5fafdf24 | 172 | |
f0cbd3ec FB |
173 | if (so == NULL) { |
174 | /* | |
175 | * If there's no socket for this packet, | |
176 | * create one | |
177 | */ | |
178 | if ((so = socreate()) == NULL) goto bad; | |
179 | if(udp_attach(so) == -1) { | |
5fafdf24 | 180 | DEBUG_MISC((dfd," udp_attach errno = %d-%s\n", |
f0cbd3ec FB |
181 | errno,strerror(errno))); |
182 | sofree(so); | |
183 | goto bad; | |
184 | } | |
3b46e624 | 185 | |
f0cbd3ec FB |
186 | /* |
187 | * Setup fields | |
188 | */ | |
f0cbd3ec FB |
189 | so->so_laddr = ip->ip_src; |
190 | so->so_lport = uh->uh_sport; | |
3b46e624 | 191 | |
f0cbd3ec FB |
192 | if ((so->so_iptos = udp_tos(so)) == 0) |
193 | so->so_iptos = ip->ip_tos; | |
3b46e624 | 194 | |
f0cbd3ec FB |
195 | /* |
196 | * XXXXX Here, check if it's in udpexec_list, | |
197 | * and if it is, do the fork_exec() etc. | |
198 | */ | |
199 | } | |
200 | ||
54fd9cdf TS |
201 | so->so_faddr = ip->ip_dst; /* XXX */ |
202 | so->so_fport = uh->uh_dport; /* XXX */ | |
203 | ||
f0cbd3ec FB |
204 | iphlen += sizeof(struct udphdr); |
205 | m->m_len -= iphlen; | |
206 | m->m_data += iphlen; | |
207 | ||
208 | /* | |
209 | * Now we sendto() the packet. | |
210 | */ | |
211 | if (so->so_emu) | |
212 | udp_emu(so, m); | |
213 | ||
214 | if(sosendto(so,m) == -1) { | |
215 | m->m_len += iphlen; | |
216 | m->m_data -= iphlen; | |
217 | *ip=save_ip; | |
218 | DEBUG_MISC((dfd,"udp tx errno = %d-%s\n",errno,strerror(errno))); | |
3b46e624 | 219 | icmp_error(m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno)); |
f0cbd3ec FB |
220 | } |
221 | ||
222 | m_free(so->so_m); /* used for ICMP if error on sorecvfrom */ | |
223 | ||
224 | /* restore the orig mbuf packet */ | |
225 | m->m_len += iphlen; | |
226 | m->m_data -= iphlen; | |
227 | *ip=save_ip; | |
228 | so->so_m=m; /* ICMP backup */ | |
229 | ||
230 | return; | |
231 | bad: | |
232 | m_freem(m); | |
f0cbd3ec FB |
233 | return; |
234 | } | |
235 | ||
5fafdf24 | 236 | int udp_output2(struct socket *so, struct mbuf *m, |
f0cbd3ec FB |
237 | struct sockaddr_in *saddr, struct sockaddr_in *daddr, |
238 | int iptos) | |
239 | { | |
240 | register struct udpiphdr *ui; | |
241 | int error = 0; | |
242 | ||
243 | DEBUG_CALL("udp_output"); | |
244 | DEBUG_ARG("so = %lx", (long)so); | |
245 | DEBUG_ARG("m = %lx", (long)m); | |
246 | DEBUG_ARG("saddr = %lx", (long)saddr->sin_addr.s_addr); | |
247 | DEBUG_ARG("daddr = %lx", (long)daddr->sin_addr.s_addr); | |
248 | ||
249 | /* | |
250 | * Adjust for header | |
251 | */ | |
252 | m->m_data -= sizeof(struct udpiphdr); | |
253 | m->m_len += sizeof(struct udpiphdr); | |
5fafdf24 | 254 | |
f0cbd3ec FB |
255 | /* |
256 | * Fill in mbuf with extended UDP header | |
257 | * and addresses and length put into network format. | |
258 | */ | |
259 | ui = mtod(m, struct udpiphdr *); | |
429d0a3d | 260 | memset(&ui->ui_i.ih_mbuf, 0 , sizeof(struct mbuf_ptr)); |
f0cbd3ec FB |
261 | ui->ui_x1 = 0; |
262 | ui->ui_pr = IPPROTO_UDP; | |
0d62c4cf | 263 | ui->ui_len = htons(m->m_len - sizeof(struct ip)); |
f0cbd3ec FB |
264 | /* XXXXX Check for from-one-location sockets, or from-any-location sockets */ |
265 | ui->ui_src = saddr->sin_addr; | |
266 | ui->ui_dst = daddr->sin_addr; | |
267 | ui->ui_sport = saddr->sin_port; | |
268 | ui->ui_dport = daddr->sin_port; | |
269 | ui->ui_ulen = ui->ui_len; | |
270 | ||
271 | /* | |
272 | * Stuff checksum and output datagram. | |
273 | */ | |
274 | ui->ui_sum = 0; | |
0d62c4cf | 275 | if ((ui->ui_sum = cksum(m, m->m_len)) == 0) |
f0cbd3ec | 276 | ui->ui_sum = 0xffff; |
f0cbd3ec FB |
277 | ((struct ip *)ui)->ip_len = m->m_len; |
278 | ||
9634d903 | 279 | ((struct ip *)ui)->ip_ttl = IPDEFTTL; |
f0cbd3ec | 280 | ((struct ip *)ui)->ip_tos = iptos; |
5fafdf24 | 281 | |
31a60e22 | 282 | STAT(udpstat.udps_opackets++); |
5fafdf24 | 283 | |
f0cbd3ec | 284 | error = ip_output(so, m); |
5fafdf24 | 285 | |
f0cbd3ec FB |
286 | return (error); |
287 | } | |
288 | ||
5fafdf24 | 289 | int udp_output(struct socket *so, struct mbuf *m, |
f0cbd3ec FB |
290 | struct sockaddr_in *addr) |
291 | ||
292 | { | |
293 | struct sockaddr_in saddr, daddr; | |
294 | ||
295 | saddr = *addr; | |
a13a4126 JK |
296 | if ((so->so_faddr.s_addr & vnetwork_mask.s_addr) == vnetwork_addr.s_addr) { |
297 | if ((so->so_faddr.s_addr & ~vnetwork_mask.s_addr) == | |
298 | ~vnetwork_mask.s_addr) { | |
299 | saddr.sin_addr = vhost_addr; | |
300 | } else if (addr->sin_addr.s_addr == loopback_addr.s_addr || | |
301 | so->so_faddr.s_addr != vhost_addr.s_addr) { | |
302 | saddr.sin_addr = so->so_faddr; | |
303 | } | |
c904d61f | 304 | } |
f0cbd3ec FB |
305 | daddr.sin_addr = so->so_laddr; |
306 | daddr.sin_port = so->so_lport; | |
3b46e624 | 307 | |
f0cbd3ec FB |
308 | return udp_output2(so, m, &saddr, &daddr, so->so_iptos); |
309 | } | |
310 | ||
311 | int | |
aeed97c4 | 312 | udp_attach(struct socket *so) |
f0cbd3ec FB |
313 | { |
314 | struct sockaddr_in addr; | |
5fafdf24 | 315 | |
f0cbd3ec FB |
316 | if((so->s = socket(AF_INET,SOCK_DGRAM,0)) != -1) { |
317 | /* | |
318 | * Here, we bind() the socket. Although not really needed | |
319 | * (sendto() on an unbound socket will bind it), it's done | |
320 | * here so that emulation of ytalk etc. don't have to do it | |
321 | */ | |
322 | addr.sin_family = AF_INET; | |
323 | addr.sin_port = 0; | |
324 | addr.sin_addr.s_addr = INADDR_ANY; | |
325 | if(bind(so->s, (struct sockaddr *)&addr, sizeof(addr))<0) { | |
326 | int lasterrno=errno; | |
379ff53d | 327 | closesocket(so->s); |
f0cbd3ec | 328 | so->s=-1; |
02d2c54c FB |
329 | #ifdef _WIN32 |
330 | WSASetLastError(lasterrno); | |
331 | #else | |
f0cbd3ec | 332 | errno=lasterrno; |
02d2c54c | 333 | #endif |
f0cbd3ec FB |
334 | } else { |
335 | /* success, insert in queue */ | |
336 | so->so_expire = curtime + SO_EXPIRE; | |
337 | insque(so,&udb); | |
338 | } | |
339 | } | |
340 | return(so->s); | |
341 | } | |
342 | ||
343 | void | |
aeed97c4 | 344 | udp_detach(struct socket *so) |
f0cbd3ec | 345 | { |
379ff53d | 346 | closesocket(so->s); |
f0cbd3ec FB |
347 | sofree(so); |
348 | } | |
349 | ||
9634d903 | 350 | static const struct tos_t udptos[] = { |
f0cbd3ec FB |
351 | {0, 53, IPTOS_LOWDELAY, 0}, /* DNS */ |
352 | {517, 517, IPTOS_LOWDELAY, EMU_TALK}, /* talk */ | |
353 | {518, 518, IPTOS_LOWDELAY, EMU_NTALK}, /* ntalk */ | |
354 | {0, 7648, IPTOS_LOWDELAY, EMU_CUSEEME}, /* Cu-Seeme */ | |
355 | {0, 0, 0, 0} | |
356 | }; | |
357 | ||
9634d903 BS |
358 | static u_int8_t |
359 | udp_tos(struct socket *so) | |
f0cbd3ec FB |
360 | { |
361 | int i = 0; | |
5fafdf24 | 362 | |
f0cbd3ec FB |
363 | while(udptos[i].tos) { |
364 | if ((udptos[i].fport && ntohs(so->so_fport) == udptos[i].fport) || | |
365 | (udptos[i].lport && ntohs(so->so_lport) == udptos[i].lport)) { | |
366 | so->so_emu = udptos[i].emu; | |
367 | return udptos[i].tos; | |
368 | } | |
369 | i++; | |
370 | } | |
5fafdf24 | 371 | |
f0cbd3ec FB |
372 | return 0; |
373 | } | |
374 | ||
375 | #ifdef EMULATE_TALK | |
376 | #include "talkd.h" | |
377 | #endif | |
378 | ||
379 | /* | |
380 | * Here, talk/ytalk/ntalk requests must be emulated | |
381 | */ | |
9634d903 BS |
382 | static void |
383 | udp_emu(struct socket *so, struct mbuf *m) | |
f0cbd3ec FB |
384 | { |
385 | struct sockaddr_in addr; | |
242acf3a | 386 | socklen_t addrlen = sizeof(addr); |
f0cbd3ec FB |
387 | #ifdef EMULATE_TALK |
388 | CTL_MSG_OLD *omsg; | |
389 | CTL_MSG *nmsg; | |
390 | char buff[sizeof(CTL_MSG)]; | |
391 | u_char type; | |
5fafdf24 | 392 | |
f0cbd3ec FB |
393 | struct talk_request { |
394 | struct talk_request *next; | |
395 | struct socket *udp_so; | |
396 | struct socket *tcp_so; | |
397 | } *req; | |
5fafdf24 TS |
398 | |
399 | static struct talk_request *req_tbl = 0; | |
400 | ||
f0cbd3ec | 401 | #endif |
5fafdf24 | 402 | |
f0cbd3ec | 403 | struct cu_header { |
101c5935 FB |
404 | uint16_t d_family; // destination family |
405 | uint16_t d_port; // destination port | |
406 | uint32_t d_addr; // destination address | |
407 | uint16_t s_family; // source family | |
408 | uint16_t s_port; // source port | |
51a36cb2 | 409 | uint32_t so_addr; // source address |
101c5935 FB |
410 | uint32_t seqn; // sequence number |
411 | uint16_t message; // message | |
412 | uint16_t data_type; // data type | |
413 | uint16_t pkt_len; // packet length | |
f0cbd3ec FB |
414 | } *cu_head; |
415 | ||
416 | switch(so->so_emu) { | |
417 | ||
418 | #ifdef EMULATE_TALK | |
419 | case EMU_TALK: | |
420 | case EMU_NTALK: | |
421 | /* | |
422 | * Talk emulation. We always change the ctl_addr to get | |
423 | * some answers from the daemon. When an ANNOUNCE comes, | |
424 | * we send LEAVE_INVITE to the local daemons. Also when a | |
425 | * DELETE comes, we send copies to the local daemons. | |
426 | */ | |
427 | if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0) | |
428 | return; | |
3b46e624 | 429 | |
f0cbd3ec FB |
430 | #define IS_OLD (so->so_emu == EMU_TALK) |
431 | ||
432 | #define COPY_MSG(dest, src) { dest->type = src->type; \ | |
433 | dest->id_num = src->id_num; \ | |
434 | dest->pid = src->pid; \ | |
435 | dest->addr = src->addr; \ | |
436 | dest->ctl_addr = src->ctl_addr; \ | |
437 | memcpy(&dest->l_name, &src->l_name, NAME_SIZE_OLD); \ | |
438 | memcpy(&dest->r_name, &src->r_name, NAME_SIZE_OLD); \ | |
439 | memcpy(&dest->r_tty, &src->r_tty, TTY_SIZE); } | |
440 | ||
441 | #define OTOSIN(ptr, field) ((struct sockaddr_in *)&ptr->field) | |
442 | /* old_sockaddr to sockaddr_in */ | |
443 | ||
444 | ||
445 | if (IS_OLD) { /* old talk */ | |
446 | omsg = mtod(m, CTL_MSG_OLD*); | |
447 | nmsg = (CTL_MSG *) buff; | |
448 | type = omsg->type; | |
449 | OTOSIN(omsg, ctl_addr)->sin_port = addr.sin_port; | |
450 | OTOSIN(omsg, ctl_addr)->sin_addr = our_addr; | |
be15b141 | 451 | pstrcpy(omsg->l_name, NAME_SIZE_OLD, getlogin()); |
5fafdf24 | 452 | } else { /* new talk */ |
f0cbd3ec FB |
453 | omsg = (CTL_MSG_OLD *) buff; |
454 | nmsg = mtod(m, CTL_MSG *); | |
455 | type = nmsg->type; | |
456 | OTOSIN(nmsg, ctl_addr)->sin_port = addr.sin_port; | |
457 | OTOSIN(nmsg, ctl_addr)->sin_addr = our_addr; | |
be15b141 | 458 | pstrcpy(nmsg->l_name, NAME_SIZE_OLD, getlogin()); |
f0cbd3ec | 459 | } |
3b46e624 | 460 | |
5fafdf24 | 461 | if (type == LOOK_UP) |
f0cbd3ec | 462 | return; /* for LOOK_UP this is enough */ |
3b46e624 | 463 | |
f0cbd3ec FB |
464 | if (IS_OLD) { /* make a copy of the message */ |
465 | COPY_MSG(nmsg, omsg); | |
466 | nmsg->vers = 1; | |
467 | nmsg->answer = 0; | |
468 | } else | |
469 | COPY_MSG(omsg, nmsg); | |
470 | ||
471 | /* | |
472 | * If if is an ANNOUNCE message, we go through the | |
473 | * request table to see if a tcp port has already | |
474 | * been redirected for this socket. If not, we solisten() | |
475 | * a new socket and add this entry to the table. | |
476 | * The port number of the tcp socket and our IP | |
477 | * are put to the addr field of the message structures. | |
478 | * Then a LEAVE_INVITE is sent to both local daemon | |
479 | * ports, 517 and 518. This is why we have two copies | |
480 | * of the message, one in old talk and one in new talk | |
481 | * format. | |
5fafdf24 | 482 | */ |
f0cbd3ec FB |
483 | |
484 | if (type == ANNOUNCE) { | |
485 | int s; | |
486 | u_short temp_port; | |
3b46e624 | 487 | |
f0cbd3ec FB |
488 | for(req = req_tbl; req; req = req->next) |
489 | if (so == req->udp_so) | |
490 | break; /* found it */ | |
3b46e624 | 491 | |
f0cbd3ec FB |
492 | if (!req) { /* no entry for so, create new */ |
493 | req = (struct talk_request *) | |
494 | malloc(sizeof(struct talk_request)); | |
495 | req->udp_so = so; | |
3b46e624 | 496 | req->tcp_so = solisten(0, |
5fafdf24 | 497 | OTOSIN(omsg, addr)->sin_addr.s_addr, |
f0cbd3ec FB |
498 | OTOSIN(omsg, addr)->sin_port, |
499 | SS_FACCEPTONCE); | |
500 | req->next = req_tbl; | |
501 | req_tbl = req; | |
3b46e624 TS |
502 | } |
503 | ||
f0cbd3ec FB |
504 | /* replace port number in addr field */ |
505 | addrlen = sizeof(addr); | |
5fafdf24 | 506 | getsockname(req->tcp_so->s, |
f0cbd3ec | 507 | (struct sockaddr *) &addr, |
3b46e624 | 508 | &addrlen); |
f0cbd3ec FB |
509 | OTOSIN(omsg, addr)->sin_port = addr.sin_port; |
510 | OTOSIN(omsg, addr)->sin_addr = our_addr; | |
511 | OTOSIN(nmsg, addr)->sin_port = addr.sin_port; | |
3b46e624 TS |
512 | OTOSIN(nmsg, addr)->sin_addr = our_addr; |
513 | ||
f0cbd3ec FB |
514 | /* send LEAVE_INVITEs */ |
515 | temp_port = OTOSIN(omsg, ctl_addr)->sin_port; | |
516 | OTOSIN(omsg, ctl_addr)->sin_port = 0; | |
517 | OTOSIN(nmsg, ctl_addr)->sin_port = 0; | |
3b46e624 TS |
518 | omsg->type = nmsg->type = LEAVE_INVITE; |
519 | ||
f0cbd3ec FB |
520 | s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP); |
521 | addr.sin_addr = our_addr; | |
522 | addr.sin_family = AF_INET; | |
523 | addr.sin_port = htons(517); | |
5fafdf24 | 524 | sendto(s, (char *)omsg, sizeof(*omsg), 0, |
f0cbd3ec FB |
525 | (struct sockaddr *)&addr, sizeof(addr)); |
526 | addr.sin_port = htons(518); | |
527 | sendto(s, (char *)nmsg, sizeof(*nmsg), 0, | |
528 | (struct sockaddr *) &addr, sizeof(addr)); | |
379ff53d | 529 | closesocket(s) ; |
f0cbd3ec | 530 | |
5fafdf24 | 531 | omsg->type = nmsg->type = ANNOUNCE; |
f0cbd3ec FB |
532 | OTOSIN(omsg, ctl_addr)->sin_port = temp_port; |
533 | OTOSIN(nmsg, ctl_addr)->sin_port = temp_port; | |
534 | } | |
3b46e624 | 535 | |
5fafdf24 | 536 | /* |
f0cbd3ec FB |
537 | * If it is a DELETE message, we send a copy to the |
538 | * local daemons. Then we delete the entry corresponding | |
539 | * to our socket from the request table. | |
540 | */ | |
3b46e624 | 541 | |
f0cbd3ec FB |
542 | if (type == DELETE) { |
543 | struct talk_request *temp_req, *req_next; | |
544 | int s; | |
545 | u_short temp_port; | |
3b46e624 | 546 | |
f0cbd3ec FB |
547 | temp_port = OTOSIN(omsg, ctl_addr)->sin_port; |
548 | OTOSIN(omsg, ctl_addr)->sin_port = 0; | |
549 | OTOSIN(nmsg, ctl_addr)->sin_port = 0; | |
3b46e624 | 550 | |
f0cbd3ec FB |
551 | s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP); |
552 | addr.sin_addr = our_addr; | |
553 | addr.sin_family = AF_INET; | |
554 | addr.sin_port = htons(517); | |
555 | sendto(s, (char *)omsg, sizeof(*omsg), 0, | |
556 | (struct sockaddr *)&addr, sizeof(addr)); | |
557 | addr.sin_port = htons(518); | |
558 | sendto(s, (char *)nmsg, sizeof(*nmsg), 0, | |
559 | (struct sockaddr *)&addr, sizeof(addr)); | |
379ff53d | 560 | closesocket(s); |
3b46e624 | 561 | |
f0cbd3ec FB |
562 | OTOSIN(omsg, ctl_addr)->sin_port = temp_port; |
563 | OTOSIN(nmsg, ctl_addr)->sin_port = temp_port; | |
564 | ||
565 | /* delete table entry */ | |
566 | if (so == req_tbl->udp_so) { | |
567 | temp_req = req_tbl; | |
568 | req_tbl = req_tbl->next; | |
569 | free(temp_req); | |
570 | } else { | |
571 | temp_req = req_tbl; | |
572 | for(req = req_tbl->next; req; req = req_next) { | |
573 | req_next = req->next; | |
574 | if (so == req->udp_so) { | |
575 | temp_req->next = req_next; | |
576 | free(req); | |
577 | break; | |
578 | } else { | |
579 | temp_req = req; | |
580 | } | |
581 | } | |
582 | } | |
583 | } | |
3b46e624 TS |
584 | |
585 | return; | |
f0cbd3ec | 586 | #endif |
3b46e624 | 587 | |
5fafdf24 TS |
588 | case EMU_CUSEEME: |
589 | ||
f0cbd3ec FB |
590 | /* |
591 | * Cu-SeeMe emulation. | |
592 | * Hopefully the packet is more that 16 bytes long. We don't | |
593 | * do any other tests, just replace the address and port | |
594 | * fields. | |
5fafdf24 | 595 | */ |
f0cbd3ec FB |
596 | if (m->m_len >= sizeof (*cu_head)) { |
597 | if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0) | |
598 | return; | |
599 | cu_head = mtod(m, struct cu_header *); | |
101c5935 | 600 | cu_head->s_port = addr.sin_port; |
51a36cb2 | 601 | cu_head->so_addr = our_addr.s_addr; |
f0cbd3ec | 602 | } |
3b46e624 | 603 | |
f0cbd3ec FB |
604 | return; |
605 | } | |
606 | } | |
607 | ||
608 | struct socket * | |
3c6a0580 JK |
609 | udp_listen(u_int32_t haddr, u_int hport, u_int32_t laddr, u_int lport, |
610 | int flags) | |
f0cbd3ec FB |
611 | { |
612 | struct sockaddr_in addr; | |
613 | struct socket *so; | |
242acf3a | 614 | socklen_t addrlen = sizeof(struct sockaddr_in), opt = 1; |
5fafdf24 | 615 | |
f0cbd3ec FB |
616 | if ((so = socreate()) == NULL) { |
617 | free(so); | |
618 | return NULL; | |
619 | } | |
620 | so->s = socket(AF_INET,SOCK_DGRAM,0); | |
621 | so->so_expire = curtime + SO_EXPIRE; | |
622 | insque(so,&udb); | |
623 | ||
624 | addr.sin_family = AF_INET; | |
3c6a0580 JK |
625 | addr.sin_addr.s_addr = haddr; |
626 | addr.sin_port = hport; | |
f0cbd3ec FB |
627 | |
628 | if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0) { | |
629 | udp_detach(so); | |
630 | return NULL; | |
631 | } | |
632 | setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int)); | |
5fafdf24 | 633 | |
f0cbd3ec FB |
634 | getsockname(so->s,(struct sockaddr *)&addr,&addrlen); |
635 | so->so_fport = addr.sin_port; | |
a13a4126 JK |
636 | if (addr.sin_addr.s_addr == 0 || |
637 | addr.sin_addr.s_addr == loopback_addr.s_addr) { | |
638 | so->so_faddr = vhost_addr; | |
639 | } else { | |
f0cbd3ec | 640 | so->so_faddr = addr.sin_addr; |
a13a4126 | 641 | } |
f0cbd3ec FB |
642 | so->so_lport = lport; |
643 | so->so_laddr.s_addr = laddr; | |
644 | if (flags != SS_FACCEPTONCE) | |
645 | so->so_expire = 0; | |
5fafdf24 | 646 | |
f932b6ce | 647 | so->so_state &= SS_PERSISTENT_MASK; |
6dd5ffb6 | 648 | so->so_state |= SS_ISFCONNECTED | flags; |
5fafdf24 | 649 | |
f0cbd3ec FB |
650 | return so; |
651 | } |