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-rw-r--r--slirp2/slirp.c762
1 files changed, 762 insertions, 0 deletions
diff --git a/slirp2/slirp.c b/slirp2/slirp.c
new file mode 100644
index 0000000..23a3e3c
--- /dev/null
+++ b/slirp2/slirp.c
@@ -0,0 +1,762 @@
+#include "slirp.h"
+#include "proxy_common.h"
+#include "android/utils/debug.h" /* for dprint */
+#include "android/utils/bufprint.h"
+#include "android/android.h"
+#include "sockets.h"
+
+#define D(...) VERBOSE_PRINT(slirp,__VA_ARGS__)
+#define DN(...) do { if (VERBOSE_CHECK(slirp)) dprintn(__VA_ARGS__); } while (0)
+
+/* host address */
+uint32_t our_addr_ip;
+/* host dns address */
+uint32_t dns_addr[DNS_ADDR_MAX];
+int dns_addr_count;
+
+/* host loopback address */
+uint32_t loopback_addr_ip;
+
+/* address for slirp virtual addresses */
+uint32_t special_addr_ip;
+
+/* virtual address alias for host */
+uint32_t alias_addr_ip;
+
+const uint8_t special_ethaddr[6] = {
+ 0x52, 0x54, 0x00, 0x12, 0x35, 0x00
+};
+
+uint8_t client_ethaddr[6] = {
+ 0x52, 0x54, 0x00, 0x12, 0x34, 0x56
+};
+
+int do_slowtimo;
+int link_up;
+struct timeval tt;
+FILE *lfd;
+
+/* XXX: suppress those select globals */
+fd_set *global_readfds, *global_writefds, *global_xfds;
+
+char slirp_hostname[33];
+
+int slirp_add_dns_server(const SockAddress* new_dns_addr)
+{
+ int dns_ip;
+
+ if (dns_addr_count >= DNS_ADDR_MAX)
+ return -1;
+
+ dns_ip = sock_address_get_ip(new_dns_addr);
+ if (dns_ip < 0)
+ return -1;
+
+ dns_addr[dns_addr_count++] = dns_ip;
+ return 0;
+}
+
+
+#ifdef _WIN32
+
+int slirp_get_system_dns_servers()
+{
+ FIXED_INFO *FixedInfo=NULL;
+ ULONG BufLen;
+ DWORD ret;
+ IP_ADDR_STRING *pIPAddr;
+
+ if (dns_addr_count > 0)
+ return dns_addr_count;
+
+ FixedInfo = (FIXED_INFO *)GlobalAlloc(GPTR, sizeof(FIXED_INFO));
+ BufLen = sizeof(FIXED_INFO);
+
+ if (ERROR_BUFFER_OVERFLOW == GetNetworkParams(FixedInfo, &BufLen)) {
+ if (FixedInfo) {
+ GlobalFree(FixedInfo);
+ FixedInfo = NULL;
+ }
+ FixedInfo = GlobalAlloc(GPTR, BufLen);
+ }
+
+ if ((ret = GetNetworkParams(FixedInfo, &BufLen)) != ERROR_SUCCESS) {
+ printf("GetNetworkParams failed. ret = %08x\n", (u_int)ret );
+ if (FixedInfo) {
+ GlobalFree(FixedInfo);
+ FixedInfo = NULL;
+ }
+ return -1;
+ }
+
+ D( "DNS Servers:");
+ pIPAddr = &(FixedInfo->DnsServerList);
+ while (pIPAddr && dns_addr_count < DNS_ADDR_MAX) {
+ uint32_t ip;
+ D( " %s", pIPAddr->IpAddress.String );
+ if (inet_strtoip(pIPAddr->IpAddress.String, &ip) == 0) {
+ if (ip == loopback_addr_ip)
+ ip = our_addr_ip;
+ if (dns_addr_count < DNS_ADDR_MAX)
+ dns_addr[dns_addr_count++] = ip;
+ }
+ pIPAddr = pIPAddr->Next;
+ }
+
+ if (FixedInfo) {
+ GlobalFree(FixedInfo);
+ FixedInfo = NULL;
+ }
+ if (dns_addr_count <= 0)
+ return -1;
+
+ return dns_addr_count;
+}
+
+#else
+
+int slirp_get_system_dns_servers(void)
+{
+ char buff[512];
+ char buff2[256];
+ FILE *f;
+
+ if (dns_addr_count > 0)
+ return dns_addr_count;
+
+#ifdef CONFIG_DARWIN
+ /* on Darwin /etc/resolv.conf is a symlink to /private/var/run/resolv.conf
+ * in some siutations, the symlink can be destroyed and the system will not
+ * re-create it. Darwin-aware applications will continue to run, but "legacy"
+ * Unix ones will not.
+ */
+ f = fopen("/private/var/run/resolv.conf", "r");
+ if (!f)
+ f = fopen("/etc/resolv.conf", "r"); /* desperate attempt to sanity */
+#else
+ f = fopen("/etc/resolv.conf", "r");
+#endif
+ if (!f)
+ return -1;
+
+ DN("emulator: IP address of your DNS(s): ");
+ while (fgets(buff, 512, f) != NULL) {
+ if (sscanf(buff, "nameserver%*[ \t]%256s", buff2) == 1) {
+ uint32_t tmp_ip;
+
+ if (inet_strtoip(buff2, &tmp_ip) < 0)
+ continue;
+ if (tmp_ip == loopback_addr_ip)
+ tmp_ip = our_addr_ip;
+ if (dns_addr_count < DNS_ADDR_MAX) {
+ dns_addr[dns_addr_count++] = tmp_ip;
+ if (dns_addr_count > 1)
+ DN(", ");
+ DN("%s", inet_iptostr(tmp_ip));
+ } else {
+ DN("(more)");
+ break;
+ }
+ }
+ }
+ DN("\n");
+ fclose(f);
+
+ if (!dns_addr_count)
+ return -1;
+
+ return dns_addr_count;
+}
+
+#endif
+
+extern void slirp_init_shapers();
+
+void slirp_init(void)
+{
+#if DEBUG
+ int slirp_logmask = 0;
+ char slirp_logfile[512];
+ {
+ const char* env = getenv( "ANDROID_SLIRP_LOGMASK" );
+ if (env != NULL)
+ slirp_logmask = atoi(env);
+ else if (VERBOSE_CHECK(slirp))
+ slirp_logmask = DEBUG_DEFAULT;
+ }
+
+ {
+ char* p = slirp_logfile;
+ char* end = p + sizeof(slirp_logfile);
+
+ p = bufprint_temp_file( p, end, "slirp.log" );
+ if (p >= end) {
+ dprint( "cannot create slirp log file in temporary directory" );
+ slirp_logmask = 0;
+ }
+ }
+ if (slirp_logmask) {
+ dprint( "sending slirp logs with mask %x to %s", slirp_logmask, slirp_logfile );
+ debug_init( slirp_logfile, slirp_logmask );
+ }
+#endif
+
+ link_up = 1;
+
+ if_init();
+ ip_init();
+
+ /* Initialise mbufs *after* setting the MTU */
+ mbuf_init();
+
+ /* set default addresses */
+ inet_strtoip("127.0.0.1", &loopback_addr_ip);
+
+ if (dns_addr_count == 0) {
+ if (slirp_get_system_dns_servers() < 0) {
+ dns_addr[0] = loopback_addr_ip;
+ dns_addr_count = 1;
+ fprintf (stderr, "Warning: No DNS servers found\n");
+ }
+ }
+
+ inet_strtoip(CTL_SPECIAL, &special_addr_ip);
+
+ alias_addr_ip = special_addr_ip | CTL_ALIAS;
+ getouraddr();
+
+ slirp_init_shapers();
+}
+
+#define CONN_CANFSEND(so) (((so)->so_state & (SS_FCANTSENDMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
+#define CONN_CANFRCV(so) (((so)->so_state & (SS_FCANTRCVMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
+#define UPD_NFDS(x) if (nfds < (x)) nfds = (x)
+
+/*
+ * curtime kept to an accuracy of 1ms
+ */
+#ifdef _WIN32
+static void updtime(void)
+{
+ struct _timeb tb;
+
+ _ftime(&tb);
+ curtime = (u_int)tb.time * (u_int)1000;
+ curtime += (u_int)tb.millitm;
+}
+#else
+static void updtime(void)
+{
+ gettimeofday(&tt, 0);
+
+ curtime = (u_int)tt.tv_sec * (u_int)1000;
+ curtime += (u_int)tt.tv_usec / (u_int)1000;
+
+ if ((tt.tv_usec % 1000) >= 500)
+ curtime++;
+}
+#endif
+
+void slirp_select_fill(int *pnfds,
+ fd_set *readfds, fd_set *writefds, fd_set *xfds)
+{
+ struct socket *so, *so_next;
+ struct timeval timeout;
+ int nfds;
+ int tmp_time;
+
+ /* fail safe */
+ global_readfds = NULL;
+ global_writefds = NULL;
+ global_xfds = NULL;
+
+ nfds = *pnfds;
+ /*
+ * First, TCP sockets
+ */
+ do_slowtimo = 0;
+ if (link_up) {
+ /*
+ * *_slowtimo needs calling if there are IP fragments
+ * in the fragment queue, or there are TCP connections active
+ */
+ do_slowtimo = ((tcb.so_next != &tcb) ||
+ (&ipq.ip_link != ipq.ip_link.next));
+
+ for (so = tcb.so_next; so != &tcb; so = so_next) {
+ so_next = so->so_next;
+
+ /*
+ * See if we need a tcp_fasttimo
+ */
+ if (time_fasttimo == 0 && so->so_tcpcb->t_flags & TF_DELACK)
+ time_fasttimo = curtime; /* Flag when we want a fasttimo */
+
+ /*
+ * NOFDREF can include still connecting to local-host,
+ * newly socreated() sockets etc. Don't want to select these.
+ */
+ if (so->so_state & SS_NOFDREF || so->s == -1)
+ continue;
+
+ /*
+ * don't register proxified socked connections here
+ */
+ if ((so->so_state & SS_PROXIFIED) != 0)
+ continue;
+
+ /*
+ * Set for reading sockets which are accepting
+ */
+ if (so->so_state & SS_FACCEPTCONN) {
+ FD_SET(so->s, readfds);
+ UPD_NFDS(so->s);
+ continue;
+ }
+
+ /*
+ * Set for writing sockets which are connecting
+ */
+ if (so->so_state & SS_ISFCONNECTING) {
+ FD_SET(so->s, writefds);
+ UPD_NFDS(so->s);
+ continue;
+ }
+
+ /*
+ * Set for writing if we are connected, can send more, and
+ * we have something to send
+ */
+ if (CONN_CANFSEND(so) && so->so_rcv.sb_cc) {
+ FD_SET(so->s, writefds);
+ UPD_NFDS(so->s);
+ }
+
+ /*
+ * Set for reading (and urgent data) if we are connected, can
+ * receive more, and we have room for it XXX /2 ?
+ */
+ if (CONN_CANFRCV(so) && (so->so_snd.sb_cc < (so->so_snd.sb_datalen/2))) {
+ FD_SET(so->s, readfds);
+ FD_SET(so->s, xfds);
+ UPD_NFDS(so->s);
+ }
+ }
+
+ /*
+ * UDP sockets
+ */
+ for (so = udb.so_next; so != &udb; so = so_next) {
+ so_next = so->so_next;
+
+ if ((so->so_state & SS_PROXIFIED) != 0)
+ continue;
+
+ /*
+ * See if it's timed out
+ */
+ if (so->so_expire) {
+ if (so->so_expire <= curtime) {
+ udp_detach(so);
+ continue;
+ } else
+ do_slowtimo = 1; /* Let socket expire */
+ }
+
+ /*
+ * When UDP packets are received from over the
+ * link, they're sendto()'d straight away, so
+ * no need for setting for writing
+ * Limit the number of packets queued by this session
+ * to 4. Note that even though we try and limit this
+ * to 4 packets, the session could have more queued
+ * if the packets needed to be fragmented
+ * (XXX <= 4 ?)
+ */
+ if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4) {
+ FD_SET(so->s, readfds);
+ UPD_NFDS(so->s);
+ }
+ }
+ }
+
+ /*
+ * Setup timeout to use minimum CPU usage, especially when idle
+ */
+
+ /*
+ * First, see the timeout needed by *timo
+ */
+ timeout.tv_sec = 0;
+ timeout.tv_usec = -1;
+ /*
+ * If a slowtimo is needed, set timeout to 500ms from the last
+ * slow timeout. If a fast timeout is needed, set timeout within
+ * 200ms of when it was requested.
+ */
+ if (do_slowtimo) {
+ /* XXX + 10000 because some select()'s aren't that accurate */
+ timeout.tv_usec = ((500 - (curtime - last_slowtimo)) * 1000) + 10000;
+ if (timeout.tv_usec < 0)
+ timeout.tv_usec = 0;
+ else if (timeout.tv_usec > 510000)
+ timeout.tv_usec = 510000;
+
+ /* Can only fasttimo if we also slowtimo */
+ if (time_fasttimo) {
+ tmp_time = (200 - (curtime - time_fasttimo)) * 1000;
+ if (tmp_time < 0)
+ tmp_time = 0;
+
+ /* Choose the smallest of the 2 */
+ if (tmp_time < timeout.tv_usec)
+ timeout.tv_usec = (u_int)tmp_time;
+ }
+ }
+
+ /*
+ * now, the proxified sockets
+ */
+ proxy_manager_select_fill(&nfds, readfds, writefds, xfds);
+
+ *pnfds = nfds;
+}
+
+void slirp_select_poll(fd_set *readfds, fd_set *writefds, fd_set *xfds)
+{
+ struct socket *so, *so_next;
+ int ret;
+
+ global_readfds = readfds;
+ global_writefds = writefds;
+ global_xfds = xfds;
+
+ /* Update time */
+ updtime();
+
+ /*
+ * See if anything has timed out
+ */
+ if (link_up) {
+ if (time_fasttimo && ((curtime - time_fasttimo) >= 2)) {
+ tcp_fasttimo();
+ time_fasttimo = 0;
+ }
+ if (do_slowtimo && ((curtime - last_slowtimo) >= 499)) {
+ ip_slowtimo();
+ tcp_slowtimo();
+ last_slowtimo = curtime;
+ }
+ }
+
+ /*
+ * Check sockets
+ */
+ if (link_up) {
+ /*
+ * Check TCP sockets
+ */
+ for (so = tcb.so_next; so != &tcb; so = so_next) {
+ so_next = so->so_next;
+
+ /*
+ * FD_ISSET is meaningless on these sockets
+ * (and they can crash the program)
+ */
+ if (so->so_state & SS_NOFDREF || so->s == -1)
+ continue;
+
+ /*
+ * proxified sockets are polled later in this
+ * function.
+ */
+ if ((so->so_state & SS_PROXIFIED) != 0)
+ continue;
+
+ /*
+ * Check for URG data
+ * This will soread as well, so no need to
+ * test for readfds below if this succeeds
+ */
+ if (FD_ISSET(so->s, xfds))
+ sorecvoob(so);
+ /*
+ * Check sockets for reading
+ */
+ else if (FD_ISSET(so->s, readfds)) {
+ /*
+ * Check for incoming connections
+ */
+ if (so->so_state & SS_FACCEPTCONN) {
+ tcp_connect(so);
+ continue;
+ } /* else */
+ ret = soread(so);
+
+ /* Output it if we read something */
+ if (ret > 0)
+ tcp_output(sototcpcb(so));
+ }
+
+ /*
+ * Check sockets for writing
+ */
+ if (FD_ISSET(so->s, writefds)) {
+ /*
+ * Check for non-blocking, still-connecting sockets
+ */
+ if (so->so_state & SS_ISFCONNECTING) {
+ /* Connected */
+ so->so_state &= ~SS_ISFCONNECTING;
+
+ ret = socket_send(so->s, (char*)&ret, 0);
+ if (ret < 0) {
+ /* XXXXX Must fix, zero bytes is a NOP */
+ if (errno == EAGAIN || errno == EWOULDBLOCK ||
+ errno == EINPROGRESS || errno == ENOTCONN)
+ continue;
+
+ /* else failed */
+ so->so_state = SS_NOFDREF;
+ }
+ /* else so->so_state &= ~SS_ISFCONNECTING; */
+
+ /*
+ * Continue tcp_input
+ */
+ tcp_input((MBuf )NULL, sizeof(struct ip), so);
+ /* continue; */
+ } else
+ ret = sowrite(so);
+ /*
+ * XXXXX If we wrote something (a lot), there
+ * could be a need for a window update.
+ * In the worst case, the remote will send
+ * a window probe to get things going again
+ */
+ }
+
+ /*
+ * Probe a still-connecting, non-blocking socket
+ * to check if it's still alive
+ */
+#ifdef PROBE_CONN
+ if (so->so_state & SS_ISFCONNECTING) {
+ ret = socket_recv(so->s, (char *)&ret, 0);
+
+ if (ret < 0) {
+ /* XXX */
+ if (errno == EAGAIN || errno == EWOULDBLOCK ||
+ errno == EINPROGRESS || errno == ENOTCONN)
+ continue; /* Still connecting, continue */
+
+ /* else failed */
+ so->so_state = SS_NOFDREF;
+
+ /* tcp_input will take care of it */
+ } else {
+ ret = socket_send(so->s, &ret, 0,0);
+ if (ret < 0) {
+ /* XXX */
+ if (errno == EAGAIN || errno == EWOULDBLOCK ||
+ errno == EINPROGRESS || errno == ENOTCONN)
+ continue;
+ /* else failed */
+ so->so_state = SS_NOFDREF;
+ } else
+ so->so_state &= ~SS_ISFCONNECTING;
+
+ }
+ tcp_input((MBuf )NULL, sizeof(struct ip),so);
+ } /* SS_ISFCONNECTING */
+#endif
+ }
+
+ /*
+ * Now UDP sockets.
+ * Incoming packets are sent straight away, they're not buffered.
+ * Incoming UDP data isn't buffered either.
+ */
+ for (so = udb.so_next; so != &udb; so = so_next) {
+ so_next = so->so_next;
+
+ if ((so->so_state & SS_PROXIFIED) != 0)
+ continue;
+
+ if (so->s != -1 && FD_ISSET(so->s, readfds)) {
+ sorecvfrom(so);
+ }
+ }
+ }
+
+ /*
+ * Now the proxified sockets
+ */
+ proxy_manager_poll(readfds, writefds, xfds);
+
+ /*
+ * See if we can start outputting
+ */
+ if (if_queued && link_up)
+ if_start();
+
+ /* clear global file descriptor sets.
+ * these reside on the stack in vl.c
+ * so they're unusable if we're not in
+ * slirp_select_fill or slirp_select_poll.
+ */
+ global_readfds = NULL;
+ global_writefds = NULL;
+ global_xfds = NULL;
+}
+
+#define ETH_ALEN 6
+#define ETH_HLEN 14
+
+#define ETH_P_IP 0x0800 /* Internet Protocol packet */
+#define ETH_P_ARP 0x0806 /* Address Resolution packet */
+
+#define ARPOP_REQUEST 1 /* ARP request */
+#define ARPOP_REPLY 2 /* ARP reply */
+
+struct ethhdr
+{
+ unsigned char h_dest[ETH_ALEN]; /* destination eth addr */
+ unsigned char h_source[ETH_ALEN]; /* source ether addr */
+ unsigned short h_proto; /* packet type ID field */
+};
+
+struct arphdr
+{
+ unsigned short ar_hrd; /* format of hardware address */
+ unsigned short ar_pro; /* format of protocol address */
+ unsigned char ar_hln; /* length of hardware address */
+ unsigned char ar_pln; /* length of protocol address */
+ unsigned short ar_op; /* ARP opcode (command) */
+
+ /*
+ * Ethernet looks like this : This bit is variable sized however...
+ */
+ unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
+ unsigned char ar_sip[4]; /* sender IP address */
+ unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
+ unsigned char ar_tip[4]; /* target IP address */
+};
+
+void arp_input(const uint8_t *pkt, int pkt_len)
+{
+ 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;
+
+ ar_op = ntohs(ah->ar_op);
+ switch(ar_op) {
+ uint32_t ar_tip_ip;
+ case ARPOP_REQUEST:
+ ar_tip_ip = (ah->ar_tip[0] << 24) | (ah->ar_tip[1] << 16) | (ah->ar_tip[2] << 8);
+ if (ar_tip_ip == special_addr_ip) {
+ if ( CTL_IS_DNS(ah->ar_tip[3]) || ah->ar_tip[3] == CTL_ALIAS)
+ 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)
+{
+ 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 = mbuf_alloc();
+ if (!m)
+ return;
+ /* Note: we add to align the IP header */
+ m->m_len = pkt_len + 2;
+ memcpy(m->m_data + 2, pkt, pkt_len);
+
+ m->m_data += 2 + ETH_HLEN;
+ m->m_len -= 2 + 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,
+ uint32_t guest_ip, int guest_port)
+{
+ if (is_udp) {
+ if (!udp_listen(host_port,
+ guest_ip,
+ guest_port, 0))
+ return -1;
+ } else {
+ if (!solisten(host_port, guest_ip, guest_port, 0))
+ return -1;
+ }
+ return 0;
+}
+
+int slirp_unredir(int is_udp, int host_port)
+{
+ if (is_udp)
+ return udp_unlisten( host_port );
+ else
+ return sounlisten( host_port );
+}
+
generated by cgit v1.1 at 2024-05-19 23:15:54 +0000