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
;
12 /* virtual address alias for host */
13 struct in_addr alias_addr
;
15 const uint8_t special_ethaddr
[6] = {
16 0x52, 0x54, 0x00, 0x12, 0x35, 0x00
19 uint8_t client_ethaddr
[6];
25 struct ex_list
*exec_list
;
27 /* XXX: suppress those select globals */
28 fd_set
*global_readfds
, *global_writefds
, *global_xfds
;
30 char slirp_hostname
[33];
34 static int get_dns_addr(struct in_addr
*pdns_addr
)
36 FIXED_INFO
*FixedInfo
=NULL
;
39 IP_ADDR_STRING
*pIPAddr
;
40 struct in_addr tmp_addr
;
42 FixedInfo
= (FIXED_INFO
*)GlobalAlloc(GPTR
, sizeof(FIXED_INFO
));
43 BufLen
= sizeof(FIXED_INFO
);
45 if (ERROR_BUFFER_OVERFLOW
== GetNetworkParams(FixedInfo
, &BufLen
)) {
47 GlobalFree(FixedInfo
);
50 FixedInfo
= GlobalAlloc(GPTR
, BufLen
);
53 if ((ret
= GetNetworkParams(FixedInfo
, &BufLen
)) != ERROR_SUCCESS
) {
54 printf("GetNetworkParams failed. ret = %08x\n", (u_int
)ret
);
56 GlobalFree(FixedInfo
);
62 pIPAddr
= &(FixedInfo
->DnsServerList
);
63 inet_aton(pIPAddr
->IpAddress
.String
, &tmp_addr
);
64 *pdns_addr
= tmp_addr
;
66 printf( "DNS Servers:\n" );
67 printf( "DNS Addr:%s\n", pIPAddr
->IpAddress
.String
);
69 pIPAddr
= FixedInfo
-> DnsServerList
.Next
;
71 printf( "DNS Addr:%s\n", pIPAddr
->IpAddress
.String
);
72 pIPAddr
= pIPAddr
->Next
;
76 GlobalFree(FixedInfo
);
84 static int get_dns_addr(struct in_addr
*pdns_addr
)
90 struct in_addr tmp_addr
;
92 f
= fopen("/etc/resolv.conf", "r");
96 lprint("IP address of your DNS(s): ");
97 while (fgets(buff
, 512, f
) != NULL
) {
98 if (sscanf(buff
, "nameserver%*[ \t]%256s", buff2
) == 1) {
99 if (!inet_aton(buff2
, &tmp_addr
))
101 if (tmp_addr
.s_addr
== loopback_addr
.s_addr
)
103 /* If it's the first one, set it to dns_addr */
105 *pdns_addr
= tmp_addr
;
112 lprint("%s", inet_ntoa(tmp_addr
));
124 void slirp_cleanup(void)
130 void slirp_init(void)
132 // debug_init("/tmp/slirp.log", DEBUG_DEFAULT);
137 WSAStartup(MAKEWORD(2,0), &Data
);
138 atexit(slirp_cleanup
);
147 /* Initialise mbufs *after* setting the MTU */
150 /* set default addresses */
151 inet_aton("127.0.0.1", &loopback_addr
);
153 if (get_dns_addr(&dns_addr
) < 0) {
154 dns_addr
= loopback_addr
;
155 fprintf (stderr
, "Warning: No DNS servers found\n");
158 inet_aton(CTL_SPECIAL
, &special_addr
);
159 alias_addr
.s_addr
= special_addr
.s_addr
| htonl(CTL_ALIAS
);
163 #define CONN_CANFSEND(so) (((so)->so_state & (SS_FCANTSENDMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
164 #define CONN_CANFRCV(so) (((so)->so_state & (SS_FCANTRCVMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
165 #define UPD_NFDS(x) if (nfds < (x)) nfds = (x)
168 * curtime kept to an accuracy of 1ms
171 static void updtime(void)
176 curtime
= (u_int
)tb
.time
* (u_int
)1000;
177 curtime
+= (u_int
)tb
.millitm
;
180 static void updtime(void)
182 gettimeofday(&tt
, 0);
184 curtime
= (u_int
)tt
.tv_sec
* (u_int
)1000;
185 curtime
+= (u_int
)tt
.tv_usec
/ (u_int
)1000;
187 if ((tt
.tv_usec
% 1000) >= 500)
192 void slirp_select_fill(int *pnfds
,
193 fd_set
*readfds
, fd_set
*writefds
, fd_set
*xfds
)
195 struct socket
*so
, *so_next
;
196 struct timeval timeout
;
201 global_readfds
= NULL
;
202 global_writefds
= NULL
;
212 * *_slowtimo needs calling if there are IP fragments
213 * in the fragment queue, or there are TCP connections active
215 do_slowtimo
= ((tcb
.so_next
!= &tcb
) ||
216 ((struct ipasfrag
*)&ipq
!= (struct ipasfrag
*)ipq
.next
));
218 for (so
= tcb
.so_next
; so
!= &tcb
; so
= so_next
) {
219 so_next
= so
->so_next
;
222 * See if we need a tcp_fasttimo
224 if (time_fasttimo
== 0 && so
->so_tcpcb
->t_flags
& TF_DELACK
)
225 time_fasttimo
= curtime
; /* Flag when we want a fasttimo */
228 * NOFDREF can include still connecting to local-host,
229 * newly socreated() sockets etc. Don't want to select these.
231 if (so
->so_state
& SS_NOFDREF
|| so
->s
== -1)
235 * Set for reading sockets which are accepting
237 if (so
->so_state
& SS_FACCEPTCONN
) {
238 FD_SET(so
->s
, readfds
);
244 * Set for writing sockets which are connecting
246 if (so
->so_state
& SS_ISFCONNECTING
) {
247 FD_SET(so
->s
, writefds
);
253 * Set for writing if we are connected, can send more, and
254 * we have something to send
256 if (CONN_CANFSEND(so
) && so
->so_rcv
.sb_cc
) {
257 FD_SET(so
->s
, writefds
);
262 * Set for reading (and urgent data) if we are connected, can
263 * receive more, and we have room for it XXX /2 ?
265 if (CONN_CANFRCV(so
) && (so
->so_snd
.sb_cc
< (so
->so_snd
.sb_datalen
/2))) {
266 FD_SET(so
->s
, readfds
);
275 for (so
= udb
.so_next
; so
!= &udb
; so
= so_next
) {
276 so_next
= so
->so_next
;
279 * See if it's timed out
282 if (so
->so_expire
<= curtime
) {
286 do_slowtimo
= 1; /* Let socket expire */
290 * When UDP packets are received from over the
291 * link, they're sendto()'d straight away, so
292 * no need for setting for writing
293 * Limit the number of packets queued by this session
294 * to 4. Note that even though we try and limit this
295 * to 4 packets, the session could have more queued
296 * if the packets needed to be fragmented
299 if ((so
->so_state
& SS_ISFCONNECTED
) && so
->so_queued
<= 4) {
300 FD_SET(so
->s
, readfds
);
307 * Setup timeout to use minimum CPU usage, especially when idle
311 * First, see the timeout needed by *timo
314 timeout
.tv_usec
= -1;
316 * If a slowtimo is needed, set timeout to 500ms from the last
317 * slow timeout. If a fast timeout is needed, set timeout within
318 * 200ms of when it was requested.
321 /* XXX + 10000 because some select()'s aren't that accurate */
322 timeout
.tv_usec
= ((500 - (curtime
- last_slowtimo
)) * 1000) + 10000;
323 if (timeout
.tv_usec
< 0)
325 else if (timeout
.tv_usec
> 510000)
326 timeout
.tv_usec
= 510000;
328 /* Can only fasttimo if we also slowtimo */
330 tmp_time
= (200 - (curtime
- time_fasttimo
)) * 1000;
334 /* Choose the smallest of the 2 */
335 if (tmp_time
< timeout
.tv_usec
)
336 timeout
.tv_usec
= (u_int
)tmp_time
;
342 void slirp_select_poll(fd_set
*readfds
, fd_set
*writefds
, fd_set
*xfds
)
344 struct socket
*so
, *so_next
;
347 global_readfds
= readfds
;
348 global_writefds
= writefds
;
355 * See if anything has timed out
358 if (time_fasttimo
&& ((curtime
- time_fasttimo
) >= 2)) {
362 if (do_slowtimo
&& ((curtime
- last_slowtimo
) >= 499)) {
365 last_slowtimo
= curtime
;
376 for (so
= tcb
.so_next
; so
!= &tcb
; so
= so_next
) {
377 so_next
= so
->so_next
;
380 * FD_ISSET is meaningless on these sockets
381 * (and they can crash the program)
383 if (so
->so_state
& SS_NOFDREF
|| so
->s
== -1)
388 * This will soread as well, so no need to
389 * test for readfds below if this succeeds
391 if (FD_ISSET(so
->s
, xfds
))
394 * Check sockets for reading
396 else if (FD_ISSET(so
->s
, readfds
)) {
398 * Check for incoming connections
400 if (so
->so_state
& SS_FACCEPTCONN
) {
406 /* Output it if we read something */
408 tcp_output(sototcpcb(so
));
412 * Check sockets for writing
414 if (FD_ISSET(so
->s
, writefds
)) {
416 * Check for non-blocking, still-connecting sockets
418 if (so
->so_state
& SS_ISFCONNECTING
) {
420 so
->so_state
&= ~SS_ISFCONNECTING
;
422 ret
= send(so
->s
, &ret
, 0, 0);
424 /* XXXXX Must fix, zero bytes is a NOP */
425 if (errno
== EAGAIN
|| errno
== EWOULDBLOCK
||
426 errno
== EINPROGRESS
|| errno
== ENOTCONN
)
430 so
->so_state
= SS_NOFDREF
;
432 /* else so->so_state &= ~SS_ISFCONNECTING; */
437 tcp_input((struct mbuf
*)NULL
, sizeof(struct ip
), so
);
442 * XXXXX If we wrote something (a lot), there
443 * could be a need for a window update.
444 * In the worst case, the remote will send
445 * a window probe to get things going again
450 * Probe a still-connecting, non-blocking socket
451 * to check if it's still alive
454 if (so
->so_state
& SS_ISFCONNECTING
) {
455 ret
= recv(so
->s
, (char *)&ret
, 0,0);
459 if (errno
== EAGAIN
|| errno
== EWOULDBLOCK
||
460 errno
== EINPROGRESS
|| errno
== ENOTCONN
)
461 continue; /* Still connecting, continue */
464 so
->so_state
= SS_NOFDREF
;
466 /* tcp_input will take care of it */
468 ret
= send(so
->s
, &ret
, 0,0);
471 if (errno
== EAGAIN
|| errno
== EWOULDBLOCK
||
472 errno
== EINPROGRESS
|| errno
== ENOTCONN
)
475 so
->so_state
= SS_NOFDREF
;
477 so
->so_state
&= ~SS_ISFCONNECTING
;
480 tcp_input((struct mbuf
*)NULL
, sizeof(struct ip
),so
);
481 } /* SS_ISFCONNECTING */
487 * Incoming packets are sent straight away, they're not buffered.
488 * Incoming UDP data isn't buffered either.
490 for (so
= udb
.so_next
; so
!= &udb
; so
= so_next
) {
491 so_next
= so
->so_next
;
493 if (so
->s
!= -1 && FD_ISSET(so
->s
, readfds
)) {
500 * See if we can start outputting
502 if (if_queued
&& link_up
)
505 /* clear global file descriptor sets.
506 * these reside on the stack in vl.c
507 * so they're unusable if we're not in
508 * slirp_select_fill or slirp_select_poll.
510 global_readfds
= NULL
;
511 global_writefds
= NULL
;
518 #define ETH_P_IP 0x0800 /* Internet Protocol packet */
519 #define ETH_P_ARP 0x0806 /* Address Resolution packet */
521 #define ARPOP_REQUEST 1 /* ARP request */
522 #define ARPOP_REPLY 2 /* ARP reply */
526 unsigned char h_dest
[ETH_ALEN
]; /* destination eth addr */
527 unsigned char h_source
[ETH_ALEN
]; /* source ether addr */
528 unsigned short h_proto
; /* packet type ID field */
533 unsigned short ar_hrd
; /* format of hardware address */
534 unsigned short ar_pro
; /* format of protocol address */
535 unsigned char ar_hln
; /* length of hardware address */
536 unsigned char ar_pln
; /* length of protocol address */
537 unsigned short ar_op
; /* ARP opcode (command) */
540 * Ethernet looks like this : This bit is variable sized however...
542 unsigned char ar_sha
[ETH_ALEN
]; /* sender hardware address */
543 unsigned char ar_sip
[4]; /* sender IP address */
544 unsigned char ar_tha
[ETH_ALEN
]; /* target hardware address */
545 unsigned char ar_tip
[4]; /* target IP address */
548 void arp_input(const uint8_t *pkt
, int pkt_len
)
550 struct ethhdr
*eh
= (struct ethhdr
*)pkt
;
551 struct arphdr
*ah
= (struct arphdr
*)(pkt
+ ETH_HLEN
);
552 uint8_t arp_reply
[ETH_HLEN
+ sizeof(struct arphdr
)];
553 struct ethhdr
*reh
= (struct ethhdr
*)arp_reply
;
554 struct arphdr
*rah
= (struct arphdr
*)(arp_reply
+ ETH_HLEN
);
556 struct ex_list
*ex_ptr
;
558 ar_op
= ntohs(ah
->ar_op
);
561 if (!memcmp(ah
->ar_tip
, &special_addr
, 3)) {
562 if (ah
->ar_tip
[3] == CTL_DNS
|| ah
->ar_tip
[3] == CTL_ALIAS
)
564 for (ex_ptr
= exec_list
; ex_ptr
; ex_ptr
= ex_ptr
->ex_next
) {
565 if (ex_ptr
->ex_addr
== ah
->ar_tip
[3])
570 /* XXX: make an ARP request to have the client address */
571 memcpy(client_ethaddr
, eh
->h_source
, ETH_ALEN
);
573 /* ARP request for alias/dns mac address */
574 memcpy(reh
->h_dest
, pkt
+ ETH_ALEN
, ETH_ALEN
);
575 memcpy(reh
->h_source
, special_ethaddr
, ETH_ALEN
- 1);
576 reh
->h_source
[5] = ah
->ar_tip
[3];
577 reh
->h_proto
= htons(ETH_P_ARP
);
579 rah
->ar_hrd
= htons(1);
580 rah
->ar_pro
= htons(ETH_P_IP
);
581 rah
->ar_hln
= ETH_ALEN
;
583 rah
->ar_op
= htons(ARPOP_REPLY
);
584 memcpy(rah
->ar_sha
, reh
->h_source
, ETH_ALEN
);
585 memcpy(rah
->ar_sip
, ah
->ar_tip
, 4);
586 memcpy(rah
->ar_tha
, ah
->ar_sha
, ETH_ALEN
);
587 memcpy(rah
->ar_tip
, ah
->ar_sip
, 4);
588 slirp_output(arp_reply
, sizeof(arp_reply
));
596 void slirp_input(const uint8_t *pkt
, int pkt_len
)
601 if (pkt_len
< ETH_HLEN
)
604 proto
= ntohs(*(uint16_t *)(pkt
+ 12));
607 arp_input(pkt
, pkt_len
);
613 /* Note: we add to align the IP header */
614 m
->m_len
= pkt_len
+ 2;
615 memcpy(m
->m_data
+ 2, pkt
, pkt_len
);
617 m
->m_data
+= 2 + ETH_HLEN
;
618 m
->m_len
-= 2 + ETH_HLEN
;
627 /* output the IP packet to the ethernet device */
628 void if_encap(const uint8_t *ip_data
, int ip_data_len
)
631 struct ethhdr
*eh
= (struct ethhdr
*)buf
;
633 if (ip_data_len
+ ETH_HLEN
> sizeof(buf
))
636 memcpy(eh
->h_dest
, client_ethaddr
, ETH_ALEN
);
637 memcpy(eh
->h_source
, special_ethaddr
, ETH_ALEN
- 1);
638 /* XXX: not correct */
639 eh
->h_source
[5] = CTL_ALIAS
;
640 eh
->h_proto
= htons(ETH_P_IP
);
641 memcpy(buf
+ sizeof(struct ethhdr
), ip_data
, ip_data_len
);
642 slirp_output(buf
, ip_data_len
+ ETH_HLEN
);
645 int slirp_redir(int is_udp
, int host_port
,
646 struct in_addr guest_addr
, int guest_port
)
649 if (!udp_listen(htons(host_port
), guest_addr
.s_addr
,
650 htons(guest_port
), 0))
653 if (!solisten(htons(host_port
), guest_addr
.s_addr
,
654 htons(guest_port
), 0))
660 int slirp_add_exec(int do_pty
, const char *args
, int addr_low_byte
,
663 return add_exec(&exec_list
, do_pty
, (char *)args
,
664 addr_low_byte
, htons(guest_port
));