mirror of
https://github.com/qemu/qemu.git
synced 2024-12-05 17:53:36 +08:00
3f423c9c8f
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1871 c046a42c-6fe2-441c-8c8c-71466251a162
662 lines
16 KiB
C
662 lines
16 KiB
C
#include "slirp.h"
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/* host address */
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struct in_addr our_addr;
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/* host dns address */
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struct in_addr dns_addr;
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/* host loopback address */
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struct in_addr loopback_addr;
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/* address for slirp virtual addresses */
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struct in_addr special_addr;
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const uint8_t special_ethaddr[6] = {
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0x52, 0x54, 0x00, 0x12, 0x35, 0x00
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};
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uint8_t client_ethaddr[6];
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int do_slowtimo;
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int link_up;
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struct timeval tt;
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FILE *lfd;
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struct ex_list *exec_list;
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/* XXX: suppress those select globals */
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fd_set *global_readfds, *global_writefds, *global_xfds;
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char slirp_hostname[33];
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#ifdef _WIN32
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static int get_dns_addr(struct in_addr *pdns_addr)
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{
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FIXED_INFO *FixedInfo=NULL;
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ULONG BufLen;
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DWORD ret;
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IP_ADDR_STRING *pIPAddr;
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struct in_addr tmp_addr;
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FixedInfo = (FIXED_INFO *)GlobalAlloc(GPTR, sizeof(FIXED_INFO));
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BufLen = sizeof(FIXED_INFO);
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if (ERROR_BUFFER_OVERFLOW == GetNetworkParams(FixedInfo, &BufLen)) {
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if (FixedInfo) {
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GlobalFree(FixedInfo);
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FixedInfo = NULL;
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}
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FixedInfo = GlobalAlloc(GPTR, BufLen);
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}
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if ((ret = GetNetworkParams(FixedInfo, &BufLen)) != ERROR_SUCCESS) {
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printf("GetNetworkParams failed. ret = %08x\n", (u_int)ret );
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if (FixedInfo) {
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GlobalFree(FixedInfo);
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FixedInfo = NULL;
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}
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return -1;
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}
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pIPAddr = &(FixedInfo->DnsServerList);
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inet_aton(pIPAddr->IpAddress.String, &tmp_addr);
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*pdns_addr = tmp_addr;
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#if 0
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printf( "DNS Servers:\n" );
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printf( "DNS Addr:%s\n", pIPAddr->IpAddress.String );
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pIPAddr = FixedInfo -> DnsServerList.Next;
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while ( pIPAddr ) {
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printf( "DNS Addr:%s\n", pIPAddr ->IpAddress.String );
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pIPAddr = pIPAddr ->Next;
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}
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#endif
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if (FixedInfo) {
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GlobalFree(FixedInfo);
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FixedInfo = NULL;
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}
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return 0;
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}
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#else
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static int get_dns_addr(struct in_addr *pdns_addr)
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{
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char buff[512];
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char buff2[256];
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FILE *f;
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int found = 0;
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struct in_addr tmp_addr;
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f = fopen("/etc/resolv.conf", "r");
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if (!f)
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return -1;
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lprint("IP address of your DNS(s): ");
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while (fgets(buff, 512, f) != NULL) {
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if (sscanf(buff, "nameserver%*[ \t]%256s", buff2) == 1) {
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if (!inet_aton(buff2, &tmp_addr))
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continue;
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if (tmp_addr.s_addr == loopback_addr.s_addr)
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tmp_addr = our_addr;
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/* If it's the first one, set it to dns_addr */
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if (!found)
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*pdns_addr = tmp_addr;
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else
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lprint(", ");
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if (++found > 3) {
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lprint("(more)");
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break;
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} else
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lprint("%s", inet_ntoa(tmp_addr));
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}
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}
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fclose(f);
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if (!found)
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return -1;
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return 0;
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}
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#endif
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#ifdef _WIN32
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void slirp_cleanup(void)
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{
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WSACleanup();
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}
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#endif
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void slirp_init(void)
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{
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// debug_init("/tmp/slirp.log", DEBUG_DEFAULT);
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#ifdef _WIN32
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{
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WSADATA Data;
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WSAStartup(MAKEWORD(2,0), &Data);
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atexit(slirp_cleanup);
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}
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#endif
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link_up = 1;
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if_init();
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ip_init();
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/* Initialise mbufs *after* setting the MTU */
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m_init();
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/* set default addresses */
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inet_aton("127.0.0.1", &loopback_addr);
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if (get_dns_addr(&dns_addr) < 0) {
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dns_addr = loopback_addr;
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fprintf (stderr, "Warning: No DNS servers found\n");
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}
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inet_aton(CTL_SPECIAL, &special_addr);
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getouraddr();
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}
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#define CONN_CANFSEND(so) (((so)->so_state & (SS_FCANTSENDMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
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#define CONN_CANFRCV(so) (((so)->so_state & (SS_FCANTRCVMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
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#define UPD_NFDS(x) if (nfds < (x)) nfds = (x)
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/*
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* curtime kept to an accuracy of 1ms
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*/
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#ifdef _WIN32
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static void updtime(void)
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{
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struct _timeb tb;
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_ftime(&tb);
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curtime = (u_int)tb.time * (u_int)1000;
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curtime += (u_int)tb.millitm;
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}
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#else
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static void updtime(void)
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{
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gettimeofday(&tt, 0);
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curtime = (u_int)tt.tv_sec * (u_int)1000;
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curtime += (u_int)tt.tv_usec / (u_int)1000;
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if ((tt.tv_usec % 1000) >= 500)
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curtime++;
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}
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#endif
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void slirp_select_fill(int *pnfds,
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fd_set *readfds, fd_set *writefds, fd_set *xfds)
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{
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struct socket *so, *so_next;
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struct timeval timeout;
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int nfds;
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int tmp_time;
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/* fail safe */
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global_readfds = NULL;
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global_writefds = NULL;
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global_xfds = NULL;
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nfds = *pnfds;
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/*
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* First, TCP sockets
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*/
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do_slowtimo = 0;
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if (link_up) {
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/*
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* *_slowtimo needs calling if there are IP fragments
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* in the fragment queue, or there are TCP connections active
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*/
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do_slowtimo = ((tcb.so_next != &tcb) ||
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((struct ipasfrag *)&ipq != (struct ipasfrag *)ipq.next));
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for (so = tcb.so_next; so != &tcb; so = so_next) {
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so_next = so->so_next;
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/*
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* See if we need a tcp_fasttimo
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*/
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if (time_fasttimo == 0 && so->so_tcpcb->t_flags & TF_DELACK)
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time_fasttimo = curtime; /* Flag when we want a fasttimo */
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/*
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* NOFDREF can include still connecting to local-host,
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* newly socreated() sockets etc. Don't want to select these.
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*/
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if (so->so_state & SS_NOFDREF || so->s == -1)
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continue;
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/*
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* Set for reading sockets which are accepting
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*/
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if (so->so_state & SS_FACCEPTCONN) {
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FD_SET(so->s, readfds);
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UPD_NFDS(so->s);
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continue;
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}
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/*
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* Set for writing sockets which are connecting
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*/
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if (so->so_state & SS_ISFCONNECTING) {
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FD_SET(so->s, writefds);
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UPD_NFDS(so->s);
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continue;
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}
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/*
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* Set for writing if we are connected, can send more, and
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* we have something to send
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*/
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if (CONN_CANFSEND(so) && so->so_rcv.sb_cc) {
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FD_SET(so->s, writefds);
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UPD_NFDS(so->s);
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}
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/*
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* Set for reading (and urgent data) if we are connected, can
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* receive more, and we have room for it XXX /2 ?
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*/
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if (CONN_CANFRCV(so) && (so->so_snd.sb_cc < (so->so_snd.sb_datalen/2))) {
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FD_SET(so->s, readfds);
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FD_SET(so->s, xfds);
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UPD_NFDS(so->s);
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}
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}
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/*
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* UDP sockets
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*/
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for (so = udb.so_next; so != &udb; so = so_next) {
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so_next = so->so_next;
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/*
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* See if it's timed out
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*/
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if (so->so_expire) {
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if (so->so_expire <= curtime) {
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udp_detach(so);
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continue;
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} else
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do_slowtimo = 1; /* Let socket expire */
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}
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/*
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* When UDP packets are received from over the
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* link, they're sendto()'d straight away, so
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* no need for setting for writing
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* Limit the number of packets queued by this session
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* to 4. Note that even though we try and limit this
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* to 4 packets, the session could have more queued
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* if the packets needed to be fragmented
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* (XXX <= 4 ?)
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*/
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if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4) {
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FD_SET(so->s, readfds);
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UPD_NFDS(so->s);
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}
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}
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}
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/*
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* Setup timeout to use minimum CPU usage, especially when idle
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*/
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/*
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* First, see the timeout needed by *timo
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*/
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timeout.tv_sec = 0;
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timeout.tv_usec = -1;
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/*
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* If a slowtimo is needed, set timeout to 500ms from the last
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* slow timeout. If a fast timeout is needed, set timeout within
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* 200ms of when it was requested.
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*/
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if (do_slowtimo) {
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/* XXX + 10000 because some select()'s aren't that accurate */
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timeout.tv_usec = ((500 - (curtime - last_slowtimo)) * 1000) + 10000;
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if (timeout.tv_usec < 0)
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timeout.tv_usec = 0;
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else if (timeout.tv_usec > 510000)
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timeout.tv_usec = 510000;
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/* Can only fasttimo if we also slowtimo */
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if (time_fasttimo) {
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tmp_time = (200 - (curtime - time_fasttimo)) * 1000;
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if (tmp_time < 0)
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tmp_time = 0;
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/* Choose the smallest of the 2 */
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if (tmp_time < timeout.tv_usec)
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timeout.tv_usec = (u_int)tmp_time;
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}
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}
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*pnfds = nfds;
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}
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void slirp_select_poll(fd_set *readfds, fd_set *writefds, fd_set *xfds)
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{
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struct socket *so, *so_next;
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int ret;
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global_readfds = readfds;
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global_writefds = writefds;
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global_xfds = xfds;
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/* Update time */
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updtime();
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/*
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* See if anything has timed out
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*/
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if (link_up) {
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if (time_fasttimo && ((curtime - time_fasttimo) >= 2)) {
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tcp_fasttimo();
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time_fasttimo = 0;
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}
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if (do_slowtimo && ((curtime - last_slowtimo) >= 499)) {
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ip_slowtimo();
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tcp_slowtimo();
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last_slowtimo = curtime;
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}
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}
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/*
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* Check sockets
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*/
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if (link_up) {
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/*
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* Check TCP sockets
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*/
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for (so = tcb.so_next; so != &tcb; so = so_next) {
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so_next = so->so_next;
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/*
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* FD_ISSET is meaningless on these sockets
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* (and they can crash the program)
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*/
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if (so->so_state & SS_NOFDREF || so->s == -1)
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continue;
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/*
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* Check for URG data
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* This will soread as well, so no need to
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* test for readfds below if this succeeds
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*/
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if (FD_ISSET(so->s, xfds))
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sorecvoob(so);
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/*
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* Check sockets for reading
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*/
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else if (FD_ISSET(so->s, readfds)) {
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/*
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* Check for incoming connections
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*/
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if (so->so_state & SS_FACCEPTCONN) {
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tcp_connect(so);
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continue;
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} /* else */
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ret = soread(so);
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/* Output it if we read something */
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if (ret > 0)
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tcp_output(sototcpcb(so));
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}
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/*
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* Check sockets for writing
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*/
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if (FD_ISSET(so->s, writefds)) {
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/*
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* Check for non-blocking, still-connecting sockets
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*/
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if (so->so_state & SS_ISFCONNECTING) {
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/* Connected */
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so->so_state &= ~SS_ISFCONNECTING;
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ret = send(so->s, &ret, 0, 0);
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if (ret < 0) {
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/* XXXXX Must fix, zero bytes is a NOP */
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if (errno == EAGAIN || errno == EWOULDBLOCK ||
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errno == EINPROGRESS || errno == ENOTCONN)
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continue;
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/* else failed */
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so->so_state = SS_NOFDREF;
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}
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/* else so->so_state &= ~SS_ISFCONNECTING; */
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/*
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* Continue tcp_input
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*/
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tcp_input((struct mbuf *)NULL, sizeof(struct ip), so);
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/* continue; */
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} else
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ret = sowrite(so);
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/*
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* XXXXX If we wrote something (a lot), there
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* could be a need for a window update.
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* In the worst case, the remote will send
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* a window probe to get things going again
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*/
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}
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/*
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* Probe a still-connecting, non-blocking socket
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* to check if it's still alive
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*/
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#ifdef PROBE_CONN
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if (so->so_state & SS_ISFCONNECTING) {
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ret = recv(so->s, (char *)&ret, 0,0);
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if (ret < 0) {
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/* XXX */
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if (errno == EAGAIN || errno == EWOULDBLOCK ||
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errno == EINPROGRESS || errno == ENOTCONN)
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continue; /* Still connecting, continue */
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/* else failed */
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so->so_state = SS_NOFDREF;
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/* tcp_input will take care of it */
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} else {
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ret = send(so->s, &ret, 0,0);
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if (ret < 0) {
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/* XXX */
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if (errno == EAGAIN || errno == EWOULDBLOCK ||
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errno == EINPROGRESS || errno == ENOTCONN)
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continue;
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/* else failed */
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so->so_state = SS_NOFDREF;
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} else
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so->so_state &= ~SS_ISFCONNECTING;
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}
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tcp_input((struct mbuf *)NULL, sizeof(struct ip),so);
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} /* SS_ISFCONNECTING */
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#endif
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}
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/*
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* Now UDP sockets.
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* Incoming packets are sent straight away, they're not buffered.
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* Incoming UDP data isn't buffered either.
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*/
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for (so = udb.so_next; so != &udb; so = so_next) {
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so_next = so->so_next;
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if (so->s != -1 && FD_ISSET(so->s, readfds)) {
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sorecvfrom(so);
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}
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}
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}
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/*
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* See if we can start outputting
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*/
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if (if_queued && link_up)
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if_start();
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/* clear global file descriptor sets.
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* these reside on the stack in vl.c
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* so they're unusable if we're not in
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* slirp_select_fill or slirp_select_poll.
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*/
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global_readfds = NULL;
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global_writefds = NULL;
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global_xfds = NULL;
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}
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#define ETH_ALEN 6
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#define ETH_HLEN 14
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#define ETH_P_IP 0x0800 /* Internet Protocol packet */
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#define ETH_P_ARP 0x0806 /* Address Resolution packet */
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#define ARPOP_REQUEST 1 /* ARP request */
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#define ARPOP_REPLY 2 /* ARP reply */
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struct ethhdr
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{
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unsigned char h_dest[ETH_ALEN]; /* destination eth addr */
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unsigned char h_source[ETH_ALEN]; /* source ether addr */
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unsigned short h_proto; /* packet type ID field */
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};
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struct arphdr
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{
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unsigned short ar_hrd; /* format of hardware address */
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unsigned short ar_pro; /* format of protocol address */
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unsigned char ar_hln; /* length of hardware address */
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unsigned char ar_pln; /* length of protocol address */
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unsigned short ar_op; /* ARP opcode (command) */
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/*
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* Ethernet looks like this : This bit is variable sized however...
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*/
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unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
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unsigned char ar_sip[4]; /* sender IP address */
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unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
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unsigned char ar_tip[4]; /* target IP address */
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};
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void arp_input(const uint8_t *pkt, int pkt_len)
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{
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struct ethhdr *eh = (struct ethhdr *)pkt;
|
|
struct arphdr *ah = (struct arphdr *)(pkt + ETH_HLEN);
|
|
uint8_t arp_reply[ETH_HLEN + sizeof(struct arphdr)];
|
|
struct ethhdr *reh = (struct ethhdr *)arp_reply;
|
|
struct arphdr *rah = (struct arphdr *)(arp_reply + ETH_HLEN);
|
|
int ar_op;
|
|
struct ex_list *ex_ptr;
|
|
|
|
ar_op = ntohs(ah->ar_op);
|
|
switch(ar_op) {
|
|
case ARPOP_REQUEST:
|
|
if (!memcmp(ah->ar_tip, &special_addr, 3)) {
|
|
if (ah->ar_tip[3] == CTL_DNS || ah->ar_tip[3] == CTL_ALIAS)
|
|
goto arp_ok;
|
|
for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
|
|
if (ex_ptr->ex_addr == ah->ar_tip[3])
|
|
goto arp_ok;
|
|
}
|
|
return;
|
|
arp_ok:
|
|
/* XXX: make an ARP request to have the client address */
|
|
memcpy(client_ethaddr, eh->h_source, ETH_ALEN);
|
|
|
|
/* ARP request for alias/dns mac address */
|
|
memcpy(reh->h_dest, pkt + ETH_ALEN, ETH_ALEN);
|
|
memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 1);
|
|
reh->h_source[5] = ah->ar_tip[3];
|
|
reh->h_proto = htons(ETH_P_ARP);
|
|
|
|
rah->ar_hrd = htons(1);
|
|
rah->ar_pro = htons(ETH_P_IP);
|
|
rah->ar_hln = ETH_ALEN;
|
|
rah->ar_pln = 4;
|
|
rah->ar_op = htons(ARPOP_REPLY);
|
|
memcpy(rah->ar_sha, reh->h_source, ETH_ALEN);
|
|
memcpy(rah->ar_sip, ah->ar_tip, 4);
|
|
memcpy(rah->ar_tha, ah->ar_sha, ETH_ALEN);
|
|
memcpy(rah->ar_tip, ah->ar_sip, 4);
|
|
slirp_output(arp_reply, sizeof(arp_reply));
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
void slirp_input(const uint8_t *pkt, int pkt_len)
|
|
{
|
|
struct mbuf *m;
|
|
int proto;
|
|
|
|
if (pkt_len < ETH_HLEN)
|
|
return;
|
|
|
|
proto = ntohs(*(uint16_t *)(pkt + 12));
|
|
switch(proto) {
|
|
case ETH_P_ARP:
|
|
arp_input(pkt, pkt_len);
|
|
break;
|
|
case ETH_P_IP:
|
|
m = m_get();
|
|
if (!m)
|
|
return;
|
|
m->m_len = pkt_len;
|
|
memcpy(m->m_data, pkt, pkt_len);
|
|
|
|
m->m_data += ETH_HLEN;
|
|
m->m_len -= ETH_HLEN;
|
|
|
|
ip_input(m);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* output the IP packet to the ethernet device */
|
|
void if_encap(const uint8_t *ip_data, int ip_data_len)
|
|
{
|
|
uint8_t buf[1600];
|
|
struct ethhdr *eh = (struct ethhdr *)buf;
|
|
|
|
if (ip_data_len + ETH_HLEN > sizeof(buf))
|
|
return;
|
|
|
|
memcpy(eh->h_dest, client_ethaddr, ETH_ALEN);
|
|
memcpy(eh->h_source, special_ethaddr, ETH_ALEN - 1);
|
|
/* XXX: not correct */
|
|
eh->h_source[5] = CTL_ALIAS;
|
|
eh->h_proto = htons(ETH_P_IP);
|
|
memcpy(buf + sizeof(struct ethhdr), ip_data, ip_data_len);
|
|
slirp_output(buf, ip_data_len + ETH_HLEN);
|
|
}
|
|
|
|
int slirp_redir(int is_udp, int host_port,
|
|
struct in_addr guest_addr, int guest_port)
|
|
{
|
|
if (is_udp) {
|
|
if (!udp_listen(htons(host_port), guest_addr.s_addr,
|
|
htons(guest_port), 0))
|
|
return -1;
|
|
} else {
|
|
if (!solisten(htons(host_port), guest_addr.s_addr,
|
|
htons(guest_port), 0))
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int slirp_add_exec(int do_pty, const char *args, int addr_low_byte,
|
|
int guest_port)
|
|
{
|
|
return add_exec(&exec_list, do_pty, (char *)args,
|
|
addr_low_byte, htons(guest_port));
|
|
}
|