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Commit | Line | Data |
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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 | /* |
54 | * UDP protocol implementation. | |
55 | * Per RFC 768, August, 1980. | |
56 | */ | |
57 | #ifndef COMPAT_42 | |
9634d903 | 58 | #define UDPCKSUM 1 |
f0cbd3ec | 59 | #else |
9634d903 | 60 | #define UDPCKSUM 0 /* XXX */ |
f0cbd3ec FB |
61 | #endif |
62 | ||
63 | struct socket *udp_last_so = &udb; | |
64 | ||
65 | void | |
aeed97c4 | 66 | udp_init(void) |
f0cbd3ec FB |
67 | { |
68 | udb.so_next = udb.so_prev = &udb; | |
69 | } | |
5fafdf24 TS |
70 | /* m->m_data points at ip packet header |
71 | * m->m_len length ip packet | |
f0cbd3ec FB |
72 | * ip->ip_len length data (IPDU) |
73 | */ | |
74 | void | |
aeed97c4 | 75 | udp_input(register struct mbuf *m, int iphlen) |
f0cbd3ec FB |
76 | { |
77 | register struct ip *ip; | |
78 | register struct udphdr *uh; | |
79 | /* struct mbuf *opts = 0;*/ | |
80 | int len; | |
5fafdf24 | 81 | struct ip save_ip; |
f0cbd3ec | 82 | struct socket *so; |
5fafdf24 | 83 | |
f0cbd3ec FB |
84 | DEBUG_CALL("udp_input"); |
85 | DEBUG_ARG("m = %lx", (long)m); | |
86 | DEBUG_ARG("iphlen = %d", iphlen); | |
5fafdf24 | 87 | |
31a60e22 | 88 | STAT(udpstat.udps_ipackets++); |
f0cbd3ec FB |
89 | |
90 | /* | |
91 | * Strip IP options, if any; should skip this, | |
92 | * make available to user, and use on returned packets, | |
93 | * but we don't yet have a way to check the checksum | |
94 | * with options still present. | |
95 | */ | |
96 | if(iphlen > sizeof(struct ip)) { | |
97 | ip_stripoptions(m, (struct mbuf *)0); | |
98 | iphlen = sizeof(struct ip); | |
99 | } | |
100 | ||
101 | /* | |
102 | * Get IP and UDP header together in first mbuf. | |
103 | */ | |
104 | ip = mtod(m, struct ip *); | |
105 | uh = (struct udphdr *)((caddr_t)ip + iphlen); | |
106 | ||
107 | /* | |
108 | * Make mbuf data length reflect UDP length. | |
109 | * If not enough data to reflect UDP length, drop. | |
110 | */ | |
111 | len = ntohs((u_int16_t)uh->uh_ulen); | |
112 | ||
113 | if (ip->ip_len != len) { | |
114 | if (len > ip->ip_len) { | |
31a60e22 | 115 | STAT(udpstat.udps_badlen++); |
f0cbd3ec FB |
116 | goto bad; |
117 | } | |
118 | m_adj(m, len - ip->ip_len); | |
119 | ip->ip_len = len; | |
120 | } | |
5fafdf24 | 121 | |
f0cbd3ec FB |
122 | /* |
123 | * Save a copy of the IP header in case we want restore it | |
124 | * for sending an ICMP error message in response. | |
125 | */ | |
5fafdf24 | 126 | save_ip = *ip; |
f0cbd3ec FB |
127 | save_ip.ip_len+= iphlen; /* tcp_input subtracts this */ |
128 | ||
129 | /* | |
130 | * Checksum extended UDP header and data. | |
131 | */ | |
9634d903 | 132 | if (UDPCKSUM && uh->uh_sum) { |
429d0a3d | 133 | memset(&((struct ipovly *)ip)->ih_mbuf, 0, sizeof(struct mbuf_ptr)); |
f0cbd3ec FB |
134 | ((struct ipovly *)ip)->ih_x1 = 0; |
135 | ((struct ipovly *)ip)->ih_len = uh->uh_ulen; | |
136 | /* keep uh_sum for ICMP reply | |
5fafdf24 TS |
137 | * uh->uh_sum = cksum(m, len + sizeof (struct ip)); |
138 | * if (uh->uh_sum) { | |
f0cbd3ec FB |
139 | */ |
140 | if(cksum(m, len + sizeof(struct ip))) { | |
31a60e22 | 141 | STAT(udpstat.udps_badsum++); |
f0cbd3ec FB |
142 | goto bad; |
143 | } | |
144 | } | |
145 | ||
146 | /* | |
147 | * handle DHCP/BOOTP | |
148 | */ | |
149 | if (ntohs(uh->uh_dport) == BOOTP_SERVER) { | |
150 | bootp_input(m); | |
151 | goto bad; | |
152 | } | |
153 | ||
a9ba3a85 AL |
154 | if (slirp_restrict) |
155 | goto bad; | |
156 | ||
c7f74643 FB |
157 | /* |
158 | * handle TFTP | |
159 | */ | |
160 | if (ntohs(uh->uh_dport) == TFTP_SERVER) { | |
161 | tftp_input(m); | |
162 | goto bad; | |
163 | } | |
164 | ||
f0cbd3ec FB |
165 | /* |
166 | * Locate pcb for datagram. | |
167 | */ | |
168 | so = udp_last_so; | |
169 | if (so->so_lport != uh->uh_sport || | |
170 | so->so_laddr.s_addr != ip->ip_src.s_addr) { | |
171 | struct socket *tmp; | |
3b46e624 | 172 | |
f0cbd3ec FB |
173 | for (tmp = udb.so_next; tmp != &udb; tmp = tmp->so_next) { |
174 | if (tmp->so_lport == uh->uh_sport && | |
175 | tmp->so_laddr.s_addr == ip->ip_src.s_addr) { | |
f0cbd3ec FB |
176 | so = tmp; |
177 | break; | |
178 | } | |
179 | } | |
180 | if (tmp == &udb) { | |
181 | so = NULL; | |
182 | } else { | |
31a60e22 | 183 | STAT(udpstat.udpps_pcbcachemiss++); |
f0cbd3ec FB |
184 | udp_last_so = so; |
185 | } | |
186 | } | |
5fafdf24 | 187 | |
f0cbd3ec FB |
188 | if (so == NULL) { |
189 | /* | |
190 | * If there's no socket for this packet, | |
191 | * create one | |
192 | */ | |
193 | if ((so = socreate()) == NULL) goto bad; | |
194 | if(udp_attach(so) == -1) { | |
5fafdf24 | 195 | DEBUG_MISC((dfd," udp_attach errno = %d-%s\n", |
f0cbd3ec FB |
196 | errno,strerror(errno))); |
197 | sofree(so); | |
198 | goto bad; | |
199 | } | |
3b46e624 | 200 | |
f0cbd3ec FB |
201 | /* |
202 | * Setup fields | |
203 | */ | |
204 | /* udp_last_so = so; */ | |
205 | so->so_laddr = ip->ip_src; | |
206 | so->so_lport = uh->uh_sport; | |
3b46e624 | 207 | |
f0cbd3ec FB |
208 | if ((so->so_iptos = udp_tos(so)) == 0) |
209 | so->so_iptos = ip->ip_tos; | |
3b46e624 | 210 | |
f0cbd3ec FB |
211 | /* |
212 | * XXXXX Here, check if it's in udpexec_list, | |
213 | * and if it is, do the fork_exec() etc. | |
214 | */ | |
215 | } | |
216 | ||
54fd9cdf TS |
217 | so->so_faddr = ip->ip_dst; /* XXX */ |
218 | so->so_fport = uh->uh_dport; /* XXX */ | |
219 | ||
f0cbd3ec FB |
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))); | |
3b46e624 | 235 | icmp_error(m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno)); |
f0cbd3ec FB |
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 | ||
5fafdf24 | 253 | int udp_output2(struct socket *so, struct mbuf *m, |
f0cbd3ec FB |
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); | |
5fafdf24 | 271 | |
f0cbd3ec FB |
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 *); | |
429d0a3d | 277 | memset(&ui->ui_i.ih_mbuf, 0 , sizeof(struct mbuf_ptr)); |
f0cbd3ec FB |
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; | |
9634d903 | 292 | if (UDPCKSUM) { |
f0cbd3ec FB |
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 | ||
9634d903 | 298 | ((struct ip *)ui)->ip_ttl = IPDEFTTL; |
f0cbd3ec | 299 | ((struct ip *)ui)->ip_tos = iptos; |
5fafdf24 | 300 | |
31a60e22 | 301 | STAT(udpstat.udps_opackets++); |
5fafdf24 | 302 | |
f0cbd3ec | 303 | error = ip_output(so, m); |
5fafdf24 | 304 | |
f0cbd3ec FB |
305 | return (error); |
306 | } | |
307 | ||
5fafdf24 | 308 | int udp_output(struct socket *so, struct mbuf *m, |
f0cbd3ec FB |
309 | struct sockaddr_in *addr) |
310 | ||
311 | { | |
312 | struct sockaddr_in saddr, daddr; | |
313 | ||
314 | saddr = *addr; | |
a13a4126 JK |
315 | if ((so->so_faddr.s_addr & vnetwork_mask.s_addr) == vnetwork_addr.s_addr) { |
316 | if ((so->so_faddr.s_addr & ~vnetwork_mask.s_addr) == | |
317 | ~vnetwork_mask.s_addr) { | |
318 | saddr.sin_addr = vhost_addr; | |
319 | } else if (addr->sin_addr.s_addr == loopback_addr.s_addr || | |
320 | so->so_faddr.s_addr != vhost_addr.s_addr) { | |
321 | saddr.sin_addr = so->so_faddr; | |
322 | } | |
c904d61f | 323 | } |
f0cbd3ec FB |
324 | daddr.sin_addr = so->so_laddr; |
325 | daddr.sin_port = so->so_lport; | |
3b46e624 | 326 | |
f0cbd3ec FB |
327 | return udp_output2(so, m, &saddr, &daddr, so->so_iptos); |
328 | } | |
329 | ||
330 | int | |
aeed97c4 | 331 | udp_attach(struct socket *so) |
f0cbd3ec FB |
332 | { |
333 | struct sockaddr_in addr; | |
5fafdf24 | 334 | |
f0cbd3ec FB |
335 | if((so->s = socket(AF_INET,SOCK_DGRAM,0)) != -1) { |
336 | /* | |
337 | * Here, we bind() the socket. Although not really needed | |
338 | * (sendto() on an unbound socket will bind it), it's done | |
339 | * here so that emulation of ytalk etc. don't have to do it | |
340 | */ | |
341 | addr.sin_family = AF_INET; | |
342 | addr.sin_port = 0; | |
343 | addr.sin_addr.s_addr = INADDR_ANY; | |
344 | if(bind(so->s, (struct sockaddr *)&addr, sizeof(addr))<0) { | |
345 | int lasterrno=errno; | |
379ff53d | 346 | closesocket(so->s); |
f0cbd3ec | 347 | so->s=-1; |
02d2c54c FB |
348 | #ifdef _WIN32 |
349 | WSASetLastError(lasterrno); | |
350 | #else | |
f0cbd3ec | 351 | errno=lasterrno; |
02d2c54c | 352 | #endif |
f0cbd3ec FB |
353 | } else { |
354 | /* success, insert in queue */ | |
355 | so->so_expire = curtime + SO_EXPIRE; | |
356 | insque(so,&udb); | |
357 | } | |
358 | } | |
359 | return(so->s); | |
360 | } | |
361 | ||
362 | void | |
aeed97c4 | 363 | udp_detach(struct socket *so) |
f0cbd3ec | 364 | { |
379ff53d | 365 | closesocket(so->s); |
f0cbd3ec FB |
366 | /* if (so->so_m) m_free(so->so_m); done by sofree */ |
367 | ||
368 | sofree(so); | |
369 | } | |
370 | ||
9634d903 | 371 | static const struct tos_t udptos[] = { |
f0cbd3ec FB |
372 | {0, 53, IPTOS_LOWDELAY, 0}, /* DNS */ |
373 | {517, 517, IPTOS_LOWDELAY, EMU_TALK}, /* talk */ | |
374 | {518, 518, IPTOS_LOWDELAY, EMU_NTALK}, /* ntalk */ | |
375 | {0, 7648, IPTOS_LOWDELAY, EMU_CUSEEME}, /* Cu-Seeme */ | |
376 | {0, 0, 0, 0} | |
377 | }; | |
378 | ||
9634d903 BS |
379 | static u_int8_t |
380 | udp_tos(struct socket *so) | |
f0cbd3ec FB |
381 | { |
382 | int i = 0; | |
5fafdf24 | 383 | |
f0cbd3ec FB |
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 | } | |
5fafdf24 | 392 | |
f0cbd3ec FB |
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 | */ | |
9634d903 BS |
403 | static void |
404 | udp_emu(struct socket *so, struct mbuf *m) | |
f0cbd3ec FB |
405 | { |
406 | struct sockaddr_in addr; | |
242acf3a | 407 | socklen_t addrlen = sizeof(addr); |
f0cbd3ec FB |
408 | #ifdef EMULATE_TALK |
409 | CTL_MSG_OLD *omsg; | |
410 | CTL_MSG *nmsg; | |
411 | char buff[sizeof(CTL_MSG)]; | |
412 | u_char type; | |
5fafdf24 | 413 | |
f0cbd3ec FB |
414 | struct talk_request { |
415 | struct talk_request *next; | |
416 | struct socket *udp_so; | |
417 | struct socket *tcp_so; | |
418 | } *req; | |
5fafdf24 TS |
419 | |
420 | static struct talk_request *req_tbl = 0; | |
421 | ||
f0cbd3ec | 422 | #endif |
5fafdf24 | 423 | |
f0cbd3ec | 424 | struct cu_header { |
101c5935 FB |
425 | uint16_t d_family; // destination family |
426 | uint16_t d_port; // destination port | |
427 | uint32_t d_addr; // destination address | |
428 | uint16_t s_family; // source family | |
429 | uint16_t s_port; // source port | |
51a36cb2 | 430 | uint32_t so_addr; // source address |
101c5935 FB |
431 | uint32_t seqn; // sequence number |
432 | uint16_t message; // message | |
433 | uint16_t data_type; // data type | |
434 | uint16_t pkt_len; // packet length | |
f0cbd3ec FB |
435 | } *cu_head; |
436 | ||
437 | switch(so->so_emu) { | |
438 | ||
439 | #ifdef EMULATE_TALK | |
440 | case EMU_TALK: | |
441 | case EMU_NTALK: | |
442 | /* | |
443 | * Talk emulation. We always change the ctl_addr to get | |
444 | * some answers from the daemon. When an ANNOUNCE comes, | |
445 | * we send LEAVE_INVITE to the local daemons. Also when a | |
446 | * DELETE comes, we send copies to the local daemons. | |
447 | */ | |
448 | if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0) | |
449 | return; | |
3b46e624 | 450 | |
f0cbd3ec FB |
451 | #define IS_OLD (so->so_emu == EMU_TALK) |
452 | ||
453 | #define COPY_MSG(dest, src) { dest->type = src->type; \ | |
454 | dest->id_num = src->id_num; \ | |
455 | dest->pid = src->pid; \ | |
456 | dest->addr = src->addr; \ | |
457 | dest->ctl_addr = src->ctl_addr; \ | |
458 | memcpy(&dest->l_name, &src->l_name, NAME_SIZE_OLD); \ | |
459 | memcpy(&dest->r_name, &src->r_name, NAME_SIZE_OLD); \ | |
460 | memcpy(&dest->r_tty, &src->r_tty, TTY_SIZE); } | |
461 | ||
462 | #define OTOSIN(ptr, field) ((struct sockaddr_in *)&ptr->field) | |
463 | /* old_sockaddr to sockaddr_in */ | |
464 | ||
465 | ||
466 | if (IS_OLD) { /* old talk */ | |
467 | omsg = mtod(m, CTL_MSG_OLD*); | |
468 | nmsg = (CTL_MSG *) buff; | |
469 | type = omsg->type; | |
470 | OTOSIN(omsg, ctl_addr)->sin_port = addr.sin_port; | |
471 | OTOSIN(omsg, ctl_addr)->sin_addr = our_addr; | |
be15b141 | 472 | pstrcpy(omsg->l_name, NAME_SIZE_OLD, getlogin()); |
5fafdf24 | 473 | } else { /* new talk */ |
f0cbd3ec FB |
474 | omsg = (CTL_MSG_OLD *) buff; |
475 | nmsg = mtod(m, CTL_MSG *); | |
476 | type = nmsg->type; | |
477 | OTOSIN(nmsg, ctl_addr)->sin_port = addr.sin_port; | |
478 | OTOSIN(nmsg, ctl_addr)->sin_addr = our_addr; | |
be15b141 | 479 | pstrcpy(nmsg->l_name, NAME_SIZE_OLD, getlogin()); |
f0cbd3ec | 480 | } |
3b46e624 | 481 | |
5fafdf24 | 482 | if (type == LOOK_UP) |
f0cbd3ec | 483 | return; /* for LOOK_UP this is enough */ |
3b46e624 | 484 | |
f0cbd3ec FB |
485 | if (IS_OLD) { /* make a copy of the message */ |
486 | COPY_MSG(nmsg, omsg); | |
487 | nmsg->vers = 1; | |
488 | nmsg->answer = 0; | |
489 | } else | |
490 | COPY_MSG(omsg, nmsg); | |
491 | ||
492 | /* | |
493 | * If if is an ANNOUNCE message, we go through the | |
494 | * request table to see if a tcp port has already | |
495 | * been redirected for this socket. If not, we solisten() | |
496 | * a new socket and add this entry to the table. | |
497 | * The port number of the tcp socket and our IP | |
498 | * are put to the addr field of the message structures. | |
499 | * Then a LEAVE_INVITE is sent to both local daemon | |
500 | * ports, 517 and 518. This is why we have two copies | |
501 | * of the message, one in old talk and one in new talk | |
502 | * format. | |
5fafdf24 | 503 | */ |
f0cbd3ec FB |
504 | |
505 | if (type == ANNOUNCE) { | |
506 | int s; | |
507 | u_short temp_port; | |
3b46e624 | 508 | |
f0cbd3ec FB |
509 | for(req = req_tbl; req; req = req->next) |
510 | if (so == req->udp_so) | |
511 | break; /* found it */ | |
3b46e624 | 512 | |
f0cbd3ec FB |
513 | if (!req) { /* no entry for so, create new */ |
514 | req = (struct talk_request *) | |
515 | malloc(sizeof(struct talk_request)); | |
516 | req->udp_so = so; | |
3b46e624 | 517 | req->tcp_so = solisten(0, |
5fafdf24 | 518 | OTOSIN(omsg, addr)->sin_addr.s_addr, |
f0cbd3ec FB |
519 | OTOSIN(omsg, addr)->sin_port, |
520 | SS_FACCEPTONCE); | |
521 | req->next = req_tbl; | |
522 | req_tbl = req; | |
3b46e624 TS |
523 | } |
524 | ||
f0cbd3ec FB |
525 | /* replace port number in addr field */ |
526 | addrlen = sizeof(addr); | |
5fafdf24 | 527 | getsockname(req->tcp_so->s, |
f0cbd3ec | 528 | (struct sockaddr *) &addr, |
3b46e624 | 529 | &addrlen); |
f0cbd3ec FB |
530 | OTOSIN(omsg, addr)->sin_port = addr.sin_port; |
531 | OTOSIN(omsg, addr)->sin_addr = our_addr; | |
532 | OTOSIN(nmsg, addr)->sin_port = addr.sin_port; | |
3b46e624 TS |
533 | OTOSIN(nmsg, addr)->sin_addr = our_addr; |
534 | ||
f0cbd3ec FB |
535 | /* send LEAVE_INVITEs */ |
536 | temp_port = OTOSIN(omsg, ctl_addr)->sin_port; | |
537 | OTOSIN(omsg, ctl_addr)->sin_port = 0; | |
538 | OTOSIN(nmsg, ctl_addr)->sin_port = 0; | |
3b46e624 TS |
539 | omsg->type = nmsg->type = LEAVE_INVITE; |
540 | ||
f0cbd3ec FB |
541 | s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP); |
542 | addr.sin_addr = our_addr; | |
543 | addr.sin_family = AF_INET; | |
544 | addr.sin_port = htons(517); | |
5fafdf24 | 545 | sendto(s, (char *)omsg, sizeof(*omsg), 0, |
f0cbd3ec FB |
546 | (struct sockaddr *)&addr, sizeof(addr)); |
547 | addr.sin_port = htons(518); | |
548 | sendto(s, (char *)nmsg, sizeof(*nmsg), 0, | |
549 | (struct sockaddr *) &addr, sizeof(addr)); | |
379ff53d | 550 | closesocket(s) ; |
f0cbd3ec | 551 | |
5fafdf24 | 552 | omsg->type = nmsg->type = ANNOUNCE; |
f0cbd3ec FB |
553 | OTOSIN(omsg, ctl_addr)->sin_port = temp_port; |
554 | OTOSIN(nmsg, ctl_addr)->sin_port = temp_port; | |
555 | } | |
3b46e624 | 556 | |
5fafdf24 | 557 | /* |
f0cbd3ec FB |
558 | * If it is a DELETE message, we send a copy to the |
559 | * local daemons. Then we delete the entry corresponding | |
560 | * to our socket from the request table. | |
561 | */ | |
3b46e624 | 562 | |
f0cbd3ec FB |
563 | if (type == DELETE) { |
564 | struct talk_request *temp_req, *req_next; | |
565 | int s; | |
566 | u_short temp_port; | |
3b46e624 | 567 | |
f0cbd3ec FB |
568 | temp_port = OTOSIN(omsg, ctl_addr)->sin_port; |
569 | OTOSIN(omsg, ctl_addr)->sin_port = 0; | |
570 | OTOSIN(nmsg, ctl_addr)->sin_port = 0; | |
3b46e624 | 571 | |
f0cbd3ec FB |
572 | s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP); |
573 | addr.sin_addr = our_addr; | |
574 | addr.sin_family = AF_INET; | |
575 | addr.sin_port = htons(517); | |
576 | sendto(s, (char *)omsg, sizeof(*omsg), 0, | |
577 | (struct sockaddr *)&addr, sizeof(addr)); | |
578 | addr.sin_port = htons(518); | |
579 | sendto(s, (char *)nmsg, sizeof(*nmsg), 0, | |
580 | (struct sockaddr *)&addr, sizeof(addr)); | |
379ff53d | 581 | closesocket(s); |
3b46e624 | 582 | |
f0cbd3ec FB |
583 | OTOSIN(omsg, ctl_addr)->sin_port = temp_port; |
584 | OTOSIN(nmsg, ctl_addr)->sin_port = temp_port; | |
585 | ||
586 | /* delete table entry */ | |
587 | if (so == req_tbl->udp_so) { | |
588 | temp_req = req_tbl; | |
589 | req_tbl = req_tbl->next; | |
590 | free(temp_req); | |
591 | } else { | |
592 | temp_req = req_tbl; | |
593 | for(req = req_tbl->next; req; req = req_next) { | |
594 | req_next = req->next; | |
595 | if (so == req->udp_so) { | |
596 | temp_req->next = req_next; | |
597 | free(req); | |
598 | break; | |
599 | } else { | |
600 | temp_req = req; | |
601 | } | |
602 | } | |
603 | } | |
604 | } | |
3b46e624 TS |
605 | |
606 | return; | |
f0cbd3ec | 607 | #endif |
3b46e624 | 608 | |
5fafdf24 TS |
609 | case EMU_CUSEEME: |
610 | ||
f0cbd3ec FB |
611 | /* |
612 | * Cu-SeeMe emulation. | |
613 | * Hopefully the packet is more that 16 bytes long. We don't | |
614 | * do any other tests, just replace the address and port | |
615 | * fields. | |
5fafdf24 | 616 | */ |
f0cbd3ec FB |
617 | if (m->m_len >= sizeof (*cu_head)) { |
618 | if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0) | |
619 | return; | |
620 | cu_head = mtod(m, struct cu_header *); | |
101c5935 | 621 | cu_head->s_port = addr.sin_port; |
51a36cb2 | 622 | cu_head->so_addr = our_addr.s_addr; |
f0cbd3ec | 623 | } |
3b46e624 | 624 | |
f0cbd3ec FB |
625 | return; |
626 | } | |
627 | } | |
628 | ||
629 | struct socket * | |
3c6a0580 JK |
630 | udp_listen(u_int32_t haddr, u_int hport, u_int32_t laddr, u_int lport, |
631 | int flags) | |
f0cbd3ec FB |
632 | { |
633 | struct sockaddr_in addr; | |
634 | struct socket *so; | |
242acf3a | 635 | socklen_t addrlen = sizeof(struct sockaddr_in), opt = 1; |
5fafdf24 | 636 | |
f0cbd3ec FB |
637 | if ((so = socreate()) == NULL) { |
638 | free(so); | |
639 | return NULL; | |
640 | } | |
641 | so->s = socket(AF_INET,SOCK_DGRAM,0); | |
642 | so->so_expire = curtime + SO_EXPIRE; | |
643 | insque(so,&udb); | |
644 | ||
645 | addr.sin_family = AF_INET; | |
3c6a0580 JK |
646 | addr.sin_addr.s_addr = haddr; |
647 | addr.sin_port = hport; | |
f0cbd3ec FB |
648 | |
649 | if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0) { | |
650 | udp_detach(so); | |
651 | return NULL; | |
652 | } | |
653 | setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int)); | |
654 | /* setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int)); */ | |
5fafdf24 | 655 | |
f0cbd3ec FB |
656 | getsockname(so->s,(struct sockaddr *)&addr,&addrlen); |
657 | so->so_fport = addr.sin_port; | |
a13a4126 JK |
658 | if (addr.sin_addr.s_addr == 0 || |
659 | addr.sin_addr.s_addr == loopback_addr.s_addr) { | |
660 | so->so_faddr = vhost_addr; | |
661 | } else { | |
f0cbd3ec | 662 | so->so_faddr = addr.sin_addr; |
a13a4126 | 663 | } |
f0cbd3ec FB |
664 | so->so_lport = lport; |
665 | so->so_laddr.s_addr = laddr; | |
666 | if (flags != SS_FACCEPTONCE) | |
667 | so->so_expire = 0; | |
5fafdf24 | 668 | |
f932b6ce | 669 | so->so_state &= SS_PERSISTENT_MASK; |
6dd5ffb6 | 670 | so->so_state |= SS_ISFCONNECTED | flags; |
5fafdf24 | 671 | |
f0cbd3ec FB |
672 | return so; |
673 | } |