root / slirp / udp.c @ 6dd5ffb6
History | View | Annotate | Download (17.2 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. Neither the name of the University nor the names of its contributors
|
| 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.
|
| 36 |
*
|
| 37 |
* Please read the file COPYRIGHT for the
|
| 38 |
* terms and conditions of the copyright.
|
| 39 |
*/
|
| 40 |
|
| 41 |
#include <slirp.h> |
| 42 |
#include "ip_icmp.h" |
| 43 |
|
| 44 |
#ifdef LOG_ENABLED
|
| 45 |
struct udpstat udpstat;
|
| 46 |
#endif
|
| 47 |
|
| 48 |
struct socket udb;
|
| 49 |
|
| 50 |
static u_int8_t udp_tos(struct socket *so); |
| 51 |
static void udp_emu(struct socket *so, struct mbuf *m); |
| 52 |
|
| 53 |
/*
|
| 54 |
* UDP protocol implementation.
|
| 55 |
* Per RFC 768, August, 1980.
|
| 56 |
*/
|
| 57 |
#ifndef COMPAT_42
|
| 58 |
#define UDPCKSUM 1 |
| 59 |
#else
|
| 60 |
#define UDPCKSUM 0 /* XXX */ |
| 61 |
#endif
|
| 62 |
|
| 63 |
struct socket *udp_last_so = &udb;
|
| 64 |
|
| 65 |
void
|
| 66 |
udp_init(void)
|
| 67 |
{
|
| 68 |
udb.so_next = udb.so_prev = &udb; |
| 69 |
} |
| 70 |
/* m->m_data points at ip packet header
|
| 71 |
* m->m_len length ip packet
|
| 72 |
* ip->ip_len length data (IPDU)
|
| 73 |
*/
|
| 74 |
void
|
| 75 |
udp_input(register struct mbuf *m, int iphlen) |
| 76 |
{
|
| 77 |
register struct ip *ip; |
| 78 |
register struct udphdr *uh; |
| 79 |
/* struct mbuf *opts = 0;*/
|
| 80 |
int len;
|
| 81 |
struct ip save_ip;
|
| 82 |
struct socket *so;
|
| 83 |
|
| 84 |
DEBUG_CALL("udp_input");
|
| 85 |
DEBUG_ARG("m = %lx", (long)m); |
| 86 |
DEBUG_ARG("iphlen = %d", iphlen);
|
| 87 |
|
| 88 |
STAT(udpstat.udps_ipackets++); |
| 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) {
|
| 115 |
STAT(udpstat.udps_badlen++); |
| 116 |
goto bad;
|
| 117 |
} |
| 118 |
m_adj(m, len - ip->ip_len); |
| 119 |
ip->ip_len = len; |
| 120 |
} |
| 121 |
|
| 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 |
*/
|
| 126 |
save_ip = *ip; |
| 127 |
save_ip.ip_len+= iphlen; /* tcp_input subtracts this */
|
| 128 |
|
| 129 |
/*
|
| 130 |
* Checksum extended UDP header and data.
|
| 131 |
*/
|
| 132 |
if (UDPCKSUM && uh->uh_sum) {
|
| 133 |
memset(&((struct ipovly *)ip)->ih_mbuf, 0, sizeof(struct mbuf_ptr)); |
| 134 |
((struct ipovly *)ip)->ih_x1 = 0; |
| 135 |
((struct ipovly *)ip)->ih_len = uh->uh_ulen;
|
| 136 |
/* keep uh_sum for ICMP reply
|
| 137 |
* uh->uh_sum = cksum(m, len + sizeof (struct ip));
|
| 138 |
* if (uh->uh_sum) {
|
| 139 |
*/
|
| 140 |
if(cksum(m, len + sizeof(struct ip))) { |
| 141 |
STAT(udpstat.udps_badsum++); |
| 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 |
|
| 154 |
if (slirp_restrict)
|
| 155 |
goto bad;
|
| 156 |
|
| 157 |
/*
|
| 158 |
* handle TFTP
|
| 159 |
*/
|
| 160 |
if (ntohs(uh->uh_dport) == TFTP_SERVER) {
|
| 161 |
tftp_input(m); |
| 162 |
goto bad;
|
| 163 |
} |
| 164 |
|
| 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;
|
| 172 |
|
| 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) {
|
| 176 |
so = tmp; |
| 177 |
break;
|
| 178 |
} |
| 179 |
} |
| 180 |
if (tmp == &udb) {
|
| 181 |
so = NULL;
|
| 182 |
} else {
|
| 183 |
STAT(udpstat.udpps_pcbcachemiss++); |
| 184 |
udp_last_so = so; |
| 185 |
} |
| 186 |
} |
| 187 |
|
| 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) { |
| 195 |
DEBUG_MISC((dfd," udp_attach errno = %d-%s\n",
|
| 196 |
errno,strerror(errno))); |
| 197 |
sofree(so); |
| 198 |
goto bad;
|
| 199 |
} |
| 200 |
|
| 201 |
/*
|
| 202 |
* Setup fields
|
| 203 |
*/
|
| 204 |
/* udp_last_so = so; */
|
| 205 |
so->so_laddr = ip->ip_src; |
| 206 |
so->so_lport = uh->uh_sport; |
| 207 |
|
| 208 |
if ((so->so_iptos = udp_tos(so)) == 0) |
| 209 |
so->so_iptos = ip->ip_tos; |
| 210 |
|
| 211 |
/*
|
| 212 |
* XXXXX Here, check if it's in udpexec_list,
|
| 213 |
* and if it is, do the fork_exec() etc.
|
| 214 |
*/
|
| 215 |
} |
| 216 |
|
| 217 |
so->so_faddr = ip->ip_dst; /* XXX */
|
| 218 |
so->so_fport = uh->uh_dport; /* XXX */
|
| 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 |
memset(&ui->ui_i.ih_mbuf, 0 , sizeof(struct mbuf_ptr)); |
| 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 = IPDEFTTL;
|
| 299 |
((struct ip *)ui)->ip_tos = iptos;
|
| 300 |
|
| 301 |
STAT(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 & 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 |
} |
| 323 |
} |
| 324 |
daddr.sin_addr = so->so_laddr; |
| 325 |
daddr.sin_port = so->so_lport; |
| 326 |
|
| 327 |
return udp_output2(so, m, &saddr, &daddr, so->so_iptos);
|
| 328 |
} |
| 329 |
|
| 330 |
int
|
| 331 |
udp_attach(struct socket *so)
|
| 332 |
{
|
| 333 |
struct sockaddr_in addr;
|
| 334 |
|
| 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;
|
| 346 |
closesocket(so->s); |
| 347 |
so->s=-1;
|
| 348 |
#ifdef _WIN32
|
| 349 |
WSASetLastError(lasterrno); |
| 350 |
#else
|
| 351 |
errno=lasterrno; |
| 352 |
#endif
|
| 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
|
| 363 |
udp_detach(struct socket *so)
|
| 364 |
{
|
| 365 |
closesocket(so->s); |
| 366 |
/* if (so->so_m) m_free(so->so_m); done by sofree */
|
| 367 |
|
| 368 |
sofree(so); |
| 369 |
} |
| 370 |
|
| 371 |
static const struct tos_t udptos[] = { |
| 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 |
|
| 379 |
static u_int8_t
|
| 380 |
udp_tos(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 |
static void |
| 404 |
udp_emu(struct socket *so, struct mbuf *m) |
| 405 |
{
|
| 406 |
struct sockaddr_in addr;
|
| 407 |
socklen_t addrlen = sizeof(addr);
|
| 408 |
#ifdef EMULATE_TALK
|
| 409 |
CTL_MSG_OLD *omsg; |
| 410 |
CTL_MSG *nmsg; |
| 411 |
char buff[sizeof(CTL_MSG)]; |
| 412 |
u_char type; |
| 413 |
|
| 414 |
struct talk_request {
|
| 415 |
struct talk_request *next;
|
| 416 |
struct socket *udp_so;
|
| 417 |
struct socket *tcp_so;
|
| 418 |
} *req; |
| 419 |
|
| 420 |
static struct talk_request *req_tbl = 0; |
| 421 |
|
| 422 |
#endif
|
| 423 |
|
| 424 |
struct cu_header {
|
| 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
|
| 430 |
uint32_t so_addr; // source address
|
| 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
|
| 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;
|
| 450 |
|
| 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; |
| 472 |
pstrcpy(omsg->l_name, NAME_SIZE_OLD, getlogin()); |
| 473 |
} else { /* new talk */ |
| 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; |
| 479 |
pstrcpy(nmsg->l_name, NAME_SIZE_OLD, getlogin()); |
| 480 |
} |
| 481 |
|
| 482 |
if (type == LOOK_UP)
|
| 483 |
return; /* for LOOK_UP this is enough */ |
| 484 |
|
| 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.
|
| 503 |
*/
|
| 504 |
|
| 505 |
if (type == ANNOUNCE) {
|
| 506 |
int s;
|
| 507 |
u_short temp_port; |
| 508 |
|
| 509 |
for(req = req_tbl; req; req = req->next)
|
| 510 |
if (so == req->udp_so)
|
| 511 |
break; /* found it */ |
| 512 |
|
| 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; |
| 517 |
req->tcp_so = solisten(0,
|
| 518 |
OTOSIN(omsg, addr)->sin_addr.s_addr, |
| 519 |
OTOSIN(omsg, addr)->sin_port, |
| 520 |
SS_FACCEPTONCE); |
| 521 |
req->next = req_tbl; |
| 522 |
req_tbl = req; |
| 523 |
} |
| 524 |
|
| 525 |
/* replace port number in addr field */
|
| 526 |
addrlen = sizeof(addr);
|
| 527 |
getsockname(req->tcp_so->s, |
| 528 |
(struct sockaddr *) &addr,
|
| 529 |
&addrlen); |
| 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; |
| 533 |
OTOSIN(nmsg, addr)->sin_addr = our_addr; |
| 534 |
|
| 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;
|
| 539 |
omsg->type = nmsg->type = LEAVE_INVITE; |
| 540 |
|
| 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);
|
| 545 |
sendto(s, (char *)omsg, sizeof(*omsg), 0, |
| 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)); |
| 550 |
closesocket(s) ; |
| 551 |
|
| 552 |
omsg->type = nmsg->type = ANNOUNCE; |
| 553 |
OTOSIN(omsg, ctl_addr)->sin_port = temp_port; |
| 554 |
OTOSIN(nmsg, ctl_addr)->sin_port = temp_port; |
| 555 |
} |
| 556 |
|
| 557 |
/*
|
| 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 |
*/
|
| 562 |
|
| 563 |
if (type == DELETE) {
|
| 564 |
struct talk_request *temp_req, *req_next;
|
| 565 |
int s;
|
| 566 |
u_short temp_port; |
| 567 |
|
| 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;
|
| 571 |
|
| 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)); |
| 581 |
closesocket(s); |
| 582 |
|
| 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 |
} |
| 605 |
|
| 606 |
return;
|
| 607 |
#endif
|
| 608 |
|
| 609 |
case EMU_CUSEEME:
|
| 610 |
|
| 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.
|
| 616 |
*/
|
| 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 *);
|
| 621 |
cu_head->s_port = addr.sin_port; |
| 622 |
cu_head->so_addr = our_addr.s_addr; |
| 623 |
} |
| 624 |
|
| 625 |
return;
|
| 626 |
} |
| 627 |
} |
| 628 |
|
| 629 |
struct socket *
|
| 630 |
udp_listen(u_int32_t haddr, u_int hport, u_int32_t laddr, u_int lport, |
| 631 |
int flags)
|
| 632 |
{
|
| 633 |
struct sockaddr_in addr;
|
| 634 |
struct socket *so;
|
| 635 |
socklen_t addrlen = sizeof(struct sockaddr_in), opt = 1; |
| 636 |
|
| 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; |
| 646 |
addr.sin_addr.s_addr = haddr; |
| 647 |
addr.sin_port = hport; |
| 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)); */
|
| 655 |
|
| 656 |
getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
|
| 657 |
so->so_fport = addr.sin_port; |
| 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 {
|
| 662 |
so->so_faddr = addr.sin_addr; |
| 663 |
} |
| 664 |
so->so_lport = lport; |
| 665 |
so->so_laddr.s_addr = laddr; |
| 666 |
if (flags != SS_FACCEPTONCE)
|
| 667 |
so->so_expire = 0;
|
| 668 |
|
| 669 |
so->so_state &= SS_PERSISTENT_MASK; |
| 670 |
so->so_state |= SS_ISFCONNECTED | flags; |
| 671 |
|
| 672 |
return so;
|
| 673 |
} |