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;
30
static int get_dns_addr(struct in_addr *pdns_addr)
32
FIXED_INFO *FixedInfo=NULL;
35
IP_ADDR_STRING *pIPAddr;
36
struct in_addr tmp_addr;
38
FixedInfo = (FIXED_INFO *)GlobalAlloc(GPTR, sizeof(FIXED_INFO));
39
BufLen = sizeof(FIXED_INFO);
41
if (ERROR_BUFFER_OVERFLOW == GetNetworkParams(FixedInfo, &BufLen)) {
43
GlobalFree(FixedInfo);
46
FixedInfo = GlobalAlloc(GPTR, BufLen);
49
if ((ret = GetNetworkParams(FixedInfo, &BufLen)) != ERROR_SUCCESS) {
50
printf("GetNetworkParams failed. ret = %08x\n", (u_int)ret );
52
GlobalFree(FixedInfo);
58
pIPAddr = &(FixedInfo->DnsServerList);
59
inet_aton(pIPAddr->IpAddress.String, &tmp_addr);
60
*pdns_addr = tmp_addr;
62
printf( "DNS Servers:\n" );
63
printf( "DNS Addr:%s\n", pIPAddr->IpAddress.String );
65
pIPAddr = FixedInfo -> DnsServerList.Next;
67
printf( "DNS Addr:%s\n", pIPAddr ->IpAddress.String );
68
pIPAddr = pIPAddr ->Next;
72
GlobalFree(FixedInfo);
80
static int get_dns_addr(struct in_addr *pdns_addr)
86
struct in_addr tmp_addr;
88
f = fopen("/etc/resolv.conf", "r");
92
lprint("IP address of your DNS(s): ");
93
while (fgets(buff, 512, f) != NULL) {
94
if (sscanf(buff, "nameserver%*[ \t]%256s", buff2) == 1) {
95
if (!inet_aton(buff2, &tmp_addr))
97
if (tmp_addr.s_addr == loopback_addr.s_addr)
99
/* If it's the first one, set it to dns_addr */
101
*pdns_addr = tmp_addr;
108
lprint("%s", inet_ntoa(tmp_addr));
120
void slirp_cleanup(void)
128
// debug_init("/tmp/slirp.log", DEBUG_DEFAULT);
133
WSAStartup(MAKEWORD(2,0), &Data);
134
atexit(slirp_cleanup);
143
/* Initialise mbufs *after* setting the MTU */
146
/* set default addresses */
148
inet_aton("127.0.0.1", &loopback_addr);
150
if (get_dns_addr(&dns_addr) < 0)
153
inet_aton(CTL_SPECIAL, &special_addr);
157
#define CONN_CANFSEND(so) (((so)->so_state & (SS_FCANTSENDMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
158
#define CONN_CANFRCV(so) (((so)->so_state & (SS_FCANTRCVMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
159
#define UPD_NFDS(x) if (nfds < (x)) nfds = (x)
162
* curtime kept to an accuracy of 1ms
165
static void updtime(void)
170
curtime = (u_int)tb.time * (u_int)1000;
171
curtime += (u_int)tb.millitm;
174
static void updtime(void)
176
gettimeofday(&tt, 0);
178
curtime = (u_int)tt.tv_sec * (u_int)1000;
179
curtime += (u_int)tt.tv_usec / (u_int)1000;
181
if ((tt.tv_usec % 1000) >= 500)
186
int slirp_select_fill(int *pnfds,
187
fd_set *readfds, fd_set *writefds, fd_set *xfds)
189
struct socket *so, *so_next;
191
int timeout, tmp_time;
194
global_readfds = NULL;
195
global_writefds = NULL;
205
* *_slowtimo needs calling if there are IP fragments
206
* in the fragment queue, or there are TCP connections active
208
do_slowtimo = ((tcb.so_next != &tcb) ||
209
((struct ipasfrag *)&ipq != (struct ipasfrag *)ipq.next));
211
for (so = tcb.so_next; so != &tcb; so = so_next) {
212
so_next = so->so_next;
215
* See if we need a tcp_fasttimo
217
if (time_fasttimo == 0 && so->so_tcpcb->t_flags & TF_DELACK)
218
time_fasttimo = curtime; /* Flag when we want a fasttimo */
221
* NOFDREF can include still connecting to local-host,
222
* newly socreated() sockets etc. Don't want to select these.
224
if (so->so_state & SS_NOFDREF || so->s == -1)
228
* Set for reading sockets which are accepting
230
if (so->so_state & SS_FACCEPTCONN) {
231
FD_SET(so->s, readfds);
237
* Set for writing sockets which are connecting
239
if (so->so_state & SS_ISFCONNECTING) {
240
FD_SET(so->s, writefds);
246
* Set for writing if we are connected, can send more, and
247
* we have something to send
249
if (CONN_CANFSEND(so) && so->so_rcv.sb_cc) {
250
FD_SET(so->s, writefds);
255
* Set for reading (and urgent data) if we are connected, can
256
* receive more, and we have room for it XXX /2 ?
258
if (CONN_CANFRCV(so) && (so->so_snd.sb_cc < (so->so_snd.sb_datalen/2))) {
259
FD_SET(so->s, readfds);
268
for (so = udb.so_next; so != &udb; so = so_next) {
269
so_next = so->so_next;
272
* See if it's timed out
275
if (so->so_expire <= curtime) {
279
do_slowtimo = 1; /* Let socket expire */
283
* When UDP packets are received from over the
284
* link, they're sendto()'d straight away, so
285
* no need for setting for writing
286
* Limit the number of packets queued by this session
287
* to 4. Note that even though we try and limit this
288
* to 4 packets, the session could have more queued
289
* if the packets needed to be fragmented
292
if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4) {
293
FD_SET(so->s, readfds);
300
* Setup timeout to use minimum CPU usage, especially when idle
306
* If a slowtimo is needed, set timeout to 5ms from the last
307
* slow timeout. If a fast timeout is needed, set timeout within
308
* 2ms of when it was requested.
313
timeout = (SLOW_TIMO - (curtime - last_slowtimo)) * 1000;
316
else if (timeout > (SLOW_TIMO * 1000))
317
timeout = SLOW_TIMO * 1000;
319
/* Can only fasttimo if we also slowtimo */
321
tmp_time = (FAST_TIMO - (curtime - time_fasttimo)) * 1000;
325
/* Choose the smallest of the 2 */
326
if (tmp_time < timeout)
333
* Adjust the timeout to make the minimum timeout
334
* 2ms (XXX?) to lessen the CPU load
336
if (timeout < (FAST_TIMO * 1000))
337
timeout = FAST_TIMO * 1000;
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) >= FAST_TIMO)) {
362
if (do_slowtimo && ((curtime - last_slowtimo) >= SLOW_TIMO)) {
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 = (pkt[12] << 8) | pkt[13];
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));