4 struct in_addr our_addr;
6 struct in_addr dns_addr;
7 /* host loopback address */
8 struct in_addr loopback_addr;
10 /* address for slirp virtual addresses */
11 struct in_addr special_addr;
13 const uint8_t special_ethaddr[6] = {
14 0x52, 0x54, 0x00, 0x12, 0x35, 0x00
17 uint8_t client_ethaddr[6];
23 struct ex_list *exec_list;
25 /* XXX: suppress those select globals */
26 fd_set *global_readfds, *global_writefds, *global_xfds;
28 char slirp_hostname[33];
32 static int get_dns_addr(struct in_addr *pdns_addr)
34 FIXED_INFO *FixedInfo=NULL;
37 IP_ADDR_STRING *pIPAddr;
38 struct in_addr tmp_addr;
40 FixedInfo = (FIXED_INFO *)GlobalAlloc(GPTR, sizeof(FIXED_INFO));
41 BufLen = sizeof(FIXED_INFO);
43 if (ERROR_BUFFER_OVERFLOW == GetNetworkParams(FixedInfo, &BufLen)) {
45 GlobalFree(FixedInfo);
48 FixedInfo = GlobalAlloc(GPTR, BufLen);
51 if ((ret = GetNetworkParams(FixedInfo, &BufLen)) != ERROR_SUCCESS) {
52 printf("GetNetworkParams failed. ret = %08x\n", (u_int)ret );
54 GlobalFree(FixedInfo);
60 pIPAddr = &(FixedInfo->DnsServerList);
61 inet_aton(pIPAddr->IpAddress.String, &tmp_addr);
62 *pdns_addr = tmp_addr;
64 printf( "DNS Servers:\n" );
65 printf( "DNS Addr:%s\n", pIPAddr->IpAddress.String );
67 pIPAddr = FixedInfo -> DnsServerList.Next;
69 printf( "DNS Addr:%s\n", pIPAddr ->IpAddress.String );
70 pIPAddr = pIPAddr ->Next;
74 GlobalFree(FixedInfo);
82 static int get_dns_addr(struct in_addr *pdns_addr)
88 struct in_addr tmp_addr;
90 f = fopen("/etc/resolv.conf", "r");
94 lprint("IP address of your DNS(s): ");
95 while (fgets(buff, 512, f) != NULL) {
96 if (sscanf(buff, "nameserver%*[ \t]%256s", buff2) == 1) {
97 if (!inet_aton(buff2, &tmp_addr))
99 if (tmp_addr.s_addr == loopback_addr.s_addr)
101 /* If it's the first one, set it to dns_addr */
103 *pdns_addr = tmp_addr;
110 lprint("%s", inet_ntoa(tmp_addr));
122 void slirp_cleanup(void)
128 void slirp_init(void)
130 // debug_init("/tmp/slirp.log", DEBUG_DEFAULT);
135 WSAStartup(MAKEWORD(2,0), &Data);
136 atexit(slirp_cleanup);
145 /* Initialise mbufs *after* setting the MTU */
148 /* set default addresses */
149 inet_aton("127.0.0.1", &loopback_addr);
151 if (get_dns_addr(&dns_addr) < 0) {
152 dns_addr = loopback_addr;
153 fprintf (stderr, "Warning: No DNS servers found\n");
156 inet_aton(CTL_SPECIAL, &special_addr);
160 #define CONN_CANFSEND(so) (((so)->so_state & (SS_FCANTSENDMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
161 #define CONN_CANFRCV(so) (((so)->so_state & (SS_FCANTRCVMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
162 #define UPD_NFDS(x) if (nfds < (x)) nfds = (x)
165 * curtime kept to an accuracy of 1ms
168 static void updtime(void)
173 curtime = (u_int)tb.time * (u_int)1000;
174 curtime += (u_int)tb.millitm;
177 static void updtime(void)
179 gettimeofday(&tt, 0);
181 curtime = (u_int)tt.tv_sec * (u_int)1000;
182 curtime += (u_int)tt.tv_usec / (u_int)1000;
184 if ((tt.tv_usec % 1000) >= 500)
189 void slirp_select_fill(int *pnfds,
190 fd_set *readfds, fd_set *writefds, fd_set *xfds)
192 struct socket *so, *so_next;
193 struct timeval timeout;
198 global_readfds = NULL;
199 global_writefds = NULL;
209 * *_slowtimo needs calling if there are IP fragments
210 * in the fragment queue, or there are TCP connections active
212 do_slowtimo = ((tcb.so_next != &tcb) ||
213 ((struct ipasfrag *)&ipq != (struct ipasfrag *)ipq.next));
215 for (so = tcb.so_next; so != &tcb; so = so_next) {
216 so_next = so->so_next;
219 * See if we need a tcp_fasttimo
221 if (time_fasttimo == 0 && so->so_tcpcb->t_flags & TF_DELACK)
222 time_fasttimo = curtime; /* Flag when we want a fasttimo */
225 * NOFDREF can include still connecting to local-host,
226 * newly socreated() sockets etc. Don't want to select these.
228 if (so->so_state & SS_NOFDREF || so->s == -1)
232 * Set for reading sockets which are accepting
234 if (so->so_state & SS_FACCEPTCONN) {
235 FD_SET(so->s, readfds);
241 * Set for writing sockets which are connecting
243 if (so->so_state & SS_ISFCONNECTING) {
244 FD_SET(so->s, writefds);
250 * Set for writing if we are connected, can send more, and
251 * we have something to send
253 if (CONN_CANFSEND(so) && so->so_rcv.sb_cc) {
254 FD_SET(so->s, writefds);
259 * Set for reading (and urgent data) if we are connected, can
260 * receive more, and we have room for it XXX /2 ?
262 if (CONN_CANFRCV(so) && (so->so_snd.sb_cc < (so->so_snd.sb_datalen/2))) {
263 FD_SET(so->s, readfds);
272 for (so = udb.so_next; so != &udb; so = so_next) {
273 so_next = so->so_next;
276 * See if it's timed out
279 if (so->so_expire <= curtime) {
283 do_slowtimo = 1; /* Let socket expire */
287 * When UDP packets are received from over the
288 * link, they're sendto()'d straight away, so
289 * no need for setting for writing
290 * Limit the number of packets queued by this session
291 * to 4. Note that even though we try and limit this
292 * to 4 packets, the session could have more queued
293 * if the packets needed to be fragmented
296 if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4) {
297 FD_SET(so->s, readfds);
304 * Setup timeout to use minimum CPU usage, especially when idle
308 * First, see the timeout needed by *timo
311 timeout.tv_usec = -1;
313 * If a slowtimo is needed, set timeout to 500ms from the last
314 * slow timeout. If a fast timeout is needed, set timeout within
315 * 200ms of when it was requested.
318 /* XXX + 10000 because some select()'s aren't that accurate */
319 timeout.tv_usec = ((500 - (curtime - last_slowtimo)) * 1000) + 10000;
320 if (timeout.tv_usec < 0)
322 else if (timeout.tv_usec > 510000)
323 timeout.tv_usec = 510000;
325 /* Can only fasttimo if we also slowtimo */
327 tmp_time = (200 - (curtime - time_fasttimo)) * 1000;
331 /* Choose the smallest of the 2 */
332 if (tmp_time < timeout.tv_usec)
333 timeout.tv_usec = (u_int)tmp_time;
339 void slirp_select_poll(fd_set *readfds, fd_set *writefds, fd_set *xfds)
341 struct socket *so, *so_next;
344 global_readfds = readfds;
345 global_writefds = writefds;
352 * See if anything has timed out
355 if (time_fasttimo && ((curtime - time_fasttimo) >= 2)) {
359 if (do_slowtimo && ((curtime - last_slowtimo) >= 499)) {
362 last_slowtimo = curtime;
373 for (so = tcb.so_next; so != &tcb; so = so_next) {
374 so_next = so->so_next;
377 * FD_ISSET is meaningless on these sockets
378 * (and they can crash the program)
380 if (so->so_state & SS_NOFDREF || so->s == -1)
385 * This will soread as well, so no need to
386 * test for readfds below if this succeeds
388 if (FD_ISSET(so->s, xfds))
391 * Check sockets for reading
393 else if (FD_ISSET(so->s, readfds)) {
395 * Check for incoming connections
397 if (so->so_state & SS_FACCEPTCONN) {
403 /* Output it if we read something */
405 tcp_output(sototcpcb(so));
409 * Check sockets for writing
411 if (FD_ISSET(so->s, writefds)) {
413 * Check for non-blocking, still-connecting sockets
415 if (so->so_state & SS_ISFCONNECTING) {
417 so->so_state &= ~SS_ISFCONNECTING;
419 ret = send(so->s, &ret, 0, 0);
421 /* XXXXX Must fix, zero bytes is a NOP */
422 if (errno == EAGAIN || errno == EWOULDBLOCK ||
423 errno == EINPROGRESS || errno == ENOTCONN)
427 so->so_state = SS_NOFDREF;
429 /* else so->so_state &= ~SS_ISFCONNECTING; */
434 tcp_input((struct mbuf *)NULL, sizeof(struct ip), so);
439 * XXXXX If we wrote something (a lot), there
440 * could be a need for a window update.
441 * In the worst case, the remote will send
442 * a window probe to get things going again
447 * Probe a still-connecting, non-blocking socket
448 * to check if it's still alive
451 if (so->so_state & SS_ISFCONNECTING) {
452 ret = recv(so->s, (char *)&ret, 0,0);
456 if (errno == EAGAIN || errno == EWOULDBLOCK ||
457 errno == EINPROGRESS || errno == ENOTCONN)
458 continue; /* Still connecting, continue */
461 so->so_state = SS_NOFDREF;
463 /* tcp_input will take care of it */
465 ret = send(so->s, &ret, 0,0);
468 if (errno == EAGAIN || errno == EWOULDBLOCK ||
469 errno == EINPROGRESS || errno == ENOTCONN)
472 so->so_state = SS_NOFDREF;
474 so->so_state &= ~SS_ISFCONNECTING;
477 tcp_input((struct mbuf *)NULL, sizeof(struct ip),so);
478 } /* SS_ISFCONNECTING */
484 * Incoming packets are sent straight away, they're not buffered.
485 * Incoming UDP data isn't buffered either.
487 for (so = udb.so_next; so != &udb; so = so_next) {
488 so_next = so->so_next;
490 if (so->s != -1 && FD_ISSET(so->s, readfds)) {
497 * See if we can start outputting
499 if (if_queued && link_up)
502 /* clear global file descriptor sets.
503 * these reside on the stack in vl.c
504 * so they're unusable if we're not in
505 * slirp_select_fill or slirp_select_poll.
507 global_readfds = NULL;
508 global_writefds = NULL;
515 #define ETH_P_IP 0x0800 /* Internet Protocol packet */
516 #define ETH_P_ARP 0x0806 /* Address Resolution packet */
518 #define ARPOP_REQUEST 1 /* ARP request */
519 #define ARPOP_REPLY 2 /* ARP reply */
523 unsigned char h_dest[ETH_ALEN]; /* destination eth addr */
524 unsigned char h_source[ETH_ALEN]; /* source ether addr */
525 unsigned short h_proto; /* packet type ID field */
530 unsigned short ar_hrd; /* format of hardware address */
531 unsigned short ar_pro; /* format of protocol address */
532 unsigned char ar_hln; /* length of hardware address */
533 unsigned char ar_pln; /* length of protocol address */
534 unsigned short ar_op; /* ARP opcode (command) */
537 * Ethernet looks like this : This bit is variable sized however...
539 unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
540 unsigned char ar_sip[4]; /* sender IP address */
541 unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
542 unsigned char ar_tip[4]; /* target IP address */
545 void arp_input(const uint8_t *pkt, int pkt_len)
547 struct ethhdr *eh = (struct ethhdr *)pkt;
548 struct arphdr *ah = (struct arphdr *)(pkt + ETH_HLEN);
549 uint8_t arp_reply[ETH_HLEN + sizeof(struct arphdr)];
550 struct ethhdr *reh = (struct ethhdr *)arp_reply;
551 struct arphdr *rah = (struct arphdr *)(arp_reply + ETH_HLEN);
553 struct ex_list *ex_ptr;
555 ar_op = ntohs(ah->ar_op);
558 if (!memcmp(ah->ar_tip, &special_addr, 3)) {
559 if (ah->ar_tip[3] == CTL_DNS || ah->ar_tip[3] == CTL_ALIAS)
561 for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
562 if (ex_ptr->ex_addr == ah->ar_tip[3])
567 /* XXX: make an ARP request to have the client address */
568 memcpy(client_ethaddr, eh->h_source, ETH_ALEN);
570 /* ARP request for alias/dns mac address */
571 memcpy(reh->h_dest, pkt + ETH_ALEN, ETH_ALEN);
572 memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 1);
573 reh->h_source[5] = ah->ar_tip[3];
574 reh->h_proto = htons(ETH_P_ARP);
576 rah->ar_hrd = htons(1);
577 rah->ar_pro = htons(ETH_P_IP);
578 rah->ar_hln = ETH_ALEN;
580 rah->ar_op = htons(ARPOP_REPLY);
581 memcpy(rah->ar_sha, reh->h_source, ETH_ALEN);
582 memcpy(rah->ar_sip, ah->ar_tip, 4);
583 memcpy(rah->ar_tha, ah->ar_sha, ETH_ALEN);
584 memcpy(rah->ar_tip, ah->ar_sip, 4);
585 slirp_output(arp_reply, sizeof(arp_reply));
593 void slirp_input(const uint8_t *pkt, int pkt_len)
598 if (pkt_len < ETH_HLEN)
601 proto = ntohs(*(uint16_t *)(pkt + 12));
604 arp_input(pkt, pkt_len);
611 memcpy(m->m_data, pkt, pkt_len);
613 m->m_data += ETH_HLEN;
614 m->m_len -= ETH_HLEN;
623 /* output the IP packet to the ethernet device */
624 void if_encap(const uint8_t *ip_data, int ip_data_len)
627 struct ethhdr *eh = (struct ethhdr *)buf;
629 if (ip_data_len + ETH_HLEN > sizeof(buf))
632 memcpy(eh->h_dest, client_ethaddr, ETH_ALEN);
633 memcpy(eh->h_source, special_ethaddr, ETH_ALEN - 1);
634 /* XXX: not correct */
635 eh->h_source[5] = CTL_ALIAS;
636 eh->h_proto = htons(ETH_P_IP);
637 memcpy(buf + sizeof(struct ethhdr), ip_data, ip_data_len);
638 slirp_output(buf, ip_data_len + ETH_HLEN);
641 int slirp_redir(int is_udp, int host_port,
642 struct in_addr guest_addr, int guest_port)
645 if (!udp_listen(htons(host_port), guest_addr.s_addr,
646 htons(guest_port), 0))
649 if (!solisten(htons(host_port), guest_addr.s_addr,
650 htons(guest_port), 0))
656 int slirp_add_exec(int do_pty, const char *args, int addr_low_byte,
659 return add_exec(&exec_list, do_pty, (char *)args,
660 addr_low_byte, htons(guest_port));