src/Unix/ether_unix.cpp

/*
 *  ether_unix.cpp - Ethernet device driver, Unix specific stuff (Linux and FreeBSD)
 *
 *  Basilisk II (C) 1997-2005 Christian Bauer
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "sysdeps.h"

#ifdef HAVE_SYS_POLL_H
#include <sys/poll.h>
#endif
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <netinet/in.h>
#include <pthread.h>
#include <semaphore.h>
#include <errno.h>
#include <stdio.h>
#include <map>

#if defined(__FreeBSD__) || defined(sgi) || (defined(__APPLE__) && defined(__MACH__))
#include <net/if.h>
#endif

#if defined(HAVE_LINUX_IF_H) && defined(HAVE_LINUX_IF_TUN_H)
#include <linux/if.h>
#include <linux/if_tun.h>
#endif

#if defined(HAVE_NET_IF_H) && defined(HAVE_NET_IF_TUN_H)
#include <net/if.h>
#include <net/if_tun.h>
#endif

#ifdef HAVE_SLIRP
#include "libslirp.h"
#endif

#include "cpu_emulation.h"
#include "main.h"
#include "macos_util.h"
#include "prefs.h"
#include "user_strings.h"
#include "ether.h"
#include "ether_defs.h"

#ifndef NO_STD_NAMESPACE
using std::map;
#endif

#define DEBUG 0
#include "debug.h"

#define MONITOR 0


// Ethernet device types
enum {
        NET_IF_SHEEPNET,
        NET_IF_ETHERTAP,
        NET_IF_TUNTAP,
        NET_IF_SLIRP
};

// Constants
static const char ETHERCONFIG_FILE_NAME[] = DATADIR "/tunconfig";

// Global variables
static int fd = -1;                                                     // fd of sheep_net device
static pthread_t ether_thread;                          // Packet reception thread
static pthread_attr_t ether_thread_attr;        // Packet reception thread attributes
static bool thread_active = false;                      // Flag: Packet reception thread installed
static sem_t int_ack;                                           // Interrupt acknowledge semaphore
static bool udp_tunnel;                                         // Flag: UDP tunnelling active, fd is the socket descriptor
static int net_if_type = -1;                            // Ethernet device type
static char *net_if_name = NULL;                        // TUN/TAP device name
static const char *net_if_script = NULL;        // Network config script
static pthread_t slirp_thread;                          // Slirp reception thread
static bool slirp_thread_active = false;        // Flag: Slirp reception threadinstalled
static int slirp_output_fd = -1;                        // fd of slirp output pipe

// Attached network protocols, maps protocol type to MacOS handler address
static map<uint16, uint32> net_protocols;

// Prototypes
static void *receive_func(void *arg);
static void *slirp_receive_func(void *arg);
static int poll_fd(int fd);


/*
 *  Start packet reception thread
 */

static bool start_thread(void)
{
        if (sem_init(&int_ack, 0, 0) < 0) {
                printf("WARNING: Cannot init semaphore");
                return false;
        }

        Set_pthread_attr(&ether_thread_attr, 1);
        thread_active = (pthread_create(&ether_thread, &ether_thread_attr, receive_func, NULL) == 0);
        if (!thread_active) {
                printf("WARNING: Cannot start Ethernet thread");
                return false;
        }

#ifdef HAVE_SLIRP
        if (net_if_type == NET_IF_SLIRP) {
                slirp_thread_active = (pthread_create(&slirp_thread, NULL, slirp_receive_func, NULL) == 0);
                if (!slirp_thread_active) {
                        printf("WARNING: Cannot start slirp reception thread\n");
                        return false;
                }
        }
#endif

        return true;
}


/*
 *  Stop packet reception thread
 */

static void stop_thread(void)
{
#ifdef HAVE_SLIRP
        if (slirp_thread_active) {
#ifdef HAVE_PTHREAD_CANCEL
                pthread_cancel(slirp_thread);
#endif
                pthread_join(slirp_thread, NULL);
                slirp_thread_active = false;
        }
#endif

        if (thread_active) {
#ifdef HAVE_PTHREAD_CANCEL
                pthread_cancel(ether_thread);
#endif
                pthread_join(ether_thread, NULL);
                sem_destroy(&int_ack);
                thread_active = false;
        }
}


/*
 *  Execute network script up|down
 */

static bool execute_network_script(const char *action)
{
        if (net_if_script == NULL || net_if_name == NULL)
                return false;

        int pid = fork();
        if (pid >= 0) {
                if (pid == 0) {
                        char *args[4];
                        args[0] = (char *)net_if_script;
                        args[1] = net_if_name;
                        args[2] = (char *)action;
                        args[3] = NULL;
                        execv(net_if_script, args);
                        exit(1);
                }
                int status;
                while (waitpid(pid, &status, 0) != pid);
                return WIFEXITED(status) && WEXITSTATUS(status) == 0;
        }

        return false;
}


/*
 *  Initialization
 */

bool ether_init(void)
{
        int nonblock = 1;
        char str[256];

        // Do nothing if no Ethernet device specified
        const char *name = PrefsFindString("ether");
        if (name == NULL)
                return false;

        // Determine Ethernet device type
        net_if_type = -1;
        if (strncmp(name, "tap", 3) == 0)
                net_if_type = NET_IF_ETHERTAP;
#if ENABLE_TUNTAP
        else if (strcmp(name, "tun") == 0)
                net_if_type = NET_IF_TUNTAP;
#endif
#ifdef HAVE_SLIRP
        else if (strcmp(name, "slirp") == 0)
                net_if_type = NET_IF_SLIRP;
#endif
        else
                net_if_type = NET_IF_SHEEPNET;

#ifdef HAVE_SLIRP
        // Initialize slirp library
        if (net_if_type == NET_IF_SLIRP) {
                slirp_init();

                // Open slirp output pipe
                int fds[2];
                if (pipe(fds) < 0)
                        return false;
                fd = fds[0];
                slirp_output_fd = fds[1];
        }
#endif

        // Open sheep_net or ethertap or TUN/TAP device
        char dev_name[16];
        switch (net_if_type) {
        case NET_IF_ETHERTAP:
                sprintf(dev_name, "/dev/%s", name);
                break;
        case NET_IF_TUNTAP:
                strcpy(dev_name, "/dev/net/tun");
                break;
        case NET_IF_SHEEPNET:
                strcpy(dev_name, "/dev/sheep_net");
                break;
        }
        if (net_if_type != NET_IF_SLIRP) {
                fd = open(dev_name, O_RDWR);
                if (fd < 0) {
                        sprintf(str, GetString(STR_NO_SHEEP_NET_DRIVER_WARN), dev_name, strerror(errno));
                        WarningAlert(str);
                        goto open_error;
                }
        }

#if ENABLE_TUNTAP
        // Open TUN/TAP interface
        if (net_if_type == NET_IF_TUNTAP) {
                struct ifreq ifr;
                memset(&ifr, 0, sizeof(ifr));
                ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
                strcpy(ifr.ifr_name, "tun%d");
                if (ioctl(fd, TUNSETIFF, (void *) &ifr) != 0) {
                        sprintf(str, GetString(STR_SHEEP_NET_ATTACH_WARN), strerror(errno));
                        WarningAlert(str);
                        goto open_error;
                }

                // Get network config script file path
                net_if_script = PrefsFindString("etherconfig");
                if (net_if_script == NULL)
                        net_if_script = ETHERCONFIG_FILE_NAME;

                // Start network script up
                if (net_if_script == NULL) {
                        sprintf(str, GetString(STR_TUN_TAP_CONFIG_WARN), "script not found");
                        WarningAlert(str);
                        goto open_error;
                }
                net_if_name = strdup(ifr.ifr_name);
                if (!execute_network_script("up")) {
                        sprintf(str, GetString(STR_TUN_TAP_CONFIG_WARN), "script execute error");
                        WarningAlert(str);
                        goto open_error;
                }
                D(bug("Connected to host network interface: %s\n", net_if_name));
        }
#endif

#if defined(__linux__)
        // Attach sheep_net to selected Ethernet card
        if (net_if_type == NET_IF_SHEEPNET && ioctl(fd, SIOCSIFLINK, name) < 0) {
                sprintf(str, GetString(STR_SHEEP_NET_ATTACH_WARN), strerror(errno));
                WarningAlert(str);
                goto open_error;
        }
#endif

        // Set nonblocking I/O
        ioctl(fd, FIONBIO, &nonblock);

        // Get Ethernet address
        if (net_if_type == NET_IF_ETHERTAP) {
                pid_t p = getpid();     // If configured for multicast, ethertap requires that the lower 32 bit of the Ethernet address are our PID
                ether_addr[0] = 0xfe;
                ether_addr[1] = 0xfd;
                ether_addr[2] = p >> 24;
                ether_addr[3] = p >> 16;
                ether_addr[4] = p >> 8;
                ether_addr[5] = p;
#ifdef HAVE_SLIRP
        } else if (net_if_type == NET_IF_SLIRP) {
                ether_addr[0] = 0x52;
                ether_addr[1] = 0x54;
                ether_addr[2] = 0x00;
                ether_addr[3] = 0x12;
                ether_addr[4] = 0x34;
                ether_addr[5] = 0x56;
#endif
        } else
                ioctl(fd, SIOCGIFADDR, ether_addr);
        D(bug("Ethernet address %02x %02x %02x %02x %02x %02x\n", ether_addr[0], ether_addr[1], ether_addr[2], ether_addr[3], ether_addr[4], ether_addr[5]));

        // Start packet reception thread
        if (!start_thread())
                goto open_error;

        // Everything OK
        return true;

open_error:
        stop_thread();

        if (fd > 0) {
                close(fd);
                fd = -1;
        }
        if (slirp_output_fd >= 0) {
                close(slirp_output_fd);
                slirp_output_fd = -1;
        }
        return false;
}


/*
 *  Deinitialization
 */

void ether_exit(void)
{
        // Stop reception threads
        stop_thread();

        // Shut down TUN/TAP interface
        if (net_if_type == NET_IF_TUNTAP)
                execute_network_script("down");

        // Free TUN/TAP device name
        if (net_if_name)
                free(net_if_name);

        // Close sheep_net device
        if (fd > 0)
                close(fd);

        // Close slirp output buffer
        if (slirp_output_fd > 0)
                close(slirp_output_fd);
}


/*
 *  Reset
 */

void ether_reset(void)
{
        net_protocols.clear();
}


/*
 *  Add multicast address
 */

int16 ether_add_multicast(uint32 pb)
{
        switch (net_if_type) {
        case NET_IF_ETHERTAP:
        case NET_IF_SHEEPNET:
                if (ioctl(fd, SIOCADDMULTI, Mac2HostAddr(pb + eMultiAddr)) < 0) {
                        D(bug("WARNING: Couldn't enable multicast address\n"));
                        if (net_if_type == NET_IF_ETHERTAP)
                                return noErr;
                        else
                                return eMultiErr;
                }
        default:
                return noErr;
        }
}


/*
 *  Delete multicast address
 */

int16 ether_del_multicast(uint32 pb)
{
        switch (net_if_type) {
        case NET_IF_ETHERTAP:
        case NET_IF_SHEEPNET:
                if (ioctl(fd, SIOCDELMULTI, Mac2HostAddr(pb + eMultiAddr)) < 0) {
                        D(bug("WARNING: Couldn't disable multicast address\n"));
                        return eMultiErr;
                }
        default:
                return noErr;
        }
}


/*
 *  Attach protocol handler
 */

int16 ether_attach_ph(uint16 type, uint32 handler)
{
        if (net_protocols.find(type) != net_protocols.end())
                return lapProtErr;
        net_protocols[type] = handler;
        return noErr;
}


/*
 *  Detach protocol handler
 */

int16 ether_detach_ph(uint16 type)
{
        if (net_protocols.erase(type) == 0)
                return lapProtErr;
        return noErr;
}


/*
 *  Transmit raw ethernet packet
 */

int16 ether_write(uint32 wds)
{
        // Copy packet to buffer
        uint8 packet[1516], *p = packet;
        int len = 0;
#if defined(__linux__)
        if (net_if_type == NET_IF_ETHERTAP) {
                *p++ = 0;       // Linux ethertap discards the first 2 bytes
                *p++ = 0;
                len += 2;
        }
#endif
        len += ether_wds_to_buffer(wds, p);

#if MONITOR
        bug("Sending Ethernet packet:\n");
        for (int i=0; i<len; i++) {
                bug("%02x ", packet[i]);
        }
        bug("\n");
#endif

        // Transmit packet
#ifdef HAVE_SLIRP
        if (net_if_type == NET_IF_SLIRP) {
                slirp_input(packet, len);
                return noErr;
        } else
#endif
        if (write(fd, packet, len) < 0) {
                D(bug("WARNING: Couldn't transmit packet\n"));
                return excessCollsns;
        } else
                return noErr;
}


/*
 *  Start UDP packet reception thread
 */

bool ether_start_udp_thread(int socket_fd)
{
        fd = socket_fd;
        udp_tunnel = true;
        return start_thread();
}


/*
 *  Stop UDP packet reception thread
 */

void ether_stop_udp_thread(void)
{
        stop_thread();
        fd = -1;
}


/*
 *  SLIRP output buffer glue
 */

#ifdef HAVE_SLIRP
int slirp_can_output(void)
{
        return 1;
}

void slirp_output(const uint8 *packet, int len)
{
        write(slirp_output_fd, packet, len);
}

void *slirp_receive_func(void *arg)
{
        for (;;) {
                // Wait for packets to arrive
                fd_set rfds, wfds, xfds;
                int nfds;
                struct timeval tv;

                nfds = -1;
                FD_ZERO(&rfds);
                FD_ZERO(&wfds);
                FD_ZERO(&xfds);
                slirp_select_fill(&nfds, &rfds, &wfds, &xfds);
                tv.tv_sec = 0;
                tv.tv_usec = 16667;
                if (select(nfds + 1, &rfds, &wfds, &xfds, &tv) >= 0)
                        slirp_select_poll(&rfds, &wfds, &xfds);

#ifdef HAVE_PTHREAD_TESTCANCEL
                // Explicit cancellation point if select() was not covered
                // This seems to be the case on MacOS X 10.2
                pthread_testcancel();
#endif
        }
        return NULL;
}
#else
int slirp_can_output(void)
{
        return 0;
}

void slirp_output(const uint8 *packet, int len)
{
}
#endif


/*
 *  Packet reception thread
 */

static void *receive_func(void *arg)
{
        for (;;) {

                // Wait for packets to arrive
#if HAVE_POLL
                struct pollfd pf = {fd, POLLIN, 0};
                int res = poll(&pf, 1, -1);
#else
                fd_set rfds;
                FD_ZERO(&rfds);
                FD_SET(fd, &rfds);
                // A NULL timeout could cause select() to block indefinitely,
                // even if it is supposed to be a cancellation point [MacOS X]
                struct timeval tv = { 0, 20000 };
                int res = select(fd + 1, &rfds, NULL, NULL, &tv);
#ifdef HAVE_PTHREAD_TESTCANCEL
                pthread_testcancel();
#endif
                if (res == 0 || (res == -1 && errno == EINTR))
                        continue;
#endif
                if (res <= 0)
                        break;

                // Trigger Ethernet interrupt
                D(bug(" packet received, triggering Ethernet interrupt\n"));
                SetInterruptFlag(INTFLAG_ETHER);
                TriggerInterrupt();

                // Wait for interrupt acknowledge by EtherInterrupt()
                sem_wait(&int_ack);
        }
        return NULL;
}


/*
 *  Ethernet interrupt - activate deferred tasks to call IODone or protocol handlers
 */

void EtherInterrupt(void)
{
        D(bug("EtherIRQ\n"));

        // Call protocol handler for received packets
        EthernetPacket ether_packet;
        uint32 packet = ether_packet.addr();
        ssize_t length;
        for (;;) {

                if (udp_tunnel) {

                        // Read packet from socket
                        struct sockaddr_in from;
                        socklen_t from_len = sizeof(from);
                        length = recvfrom(fd, Mac2HostAddr(packet), 1514, 0, (struct sockaddr *)&from, &from_len);
                        if (length < 14)
                                break;
                        ether_udp_read(packet, length, &from);

                } else {

                        // Read packet from sheep_net device
#if defined(__linux__)
                        length = read(fd, Mac2HostAddr(packet), net_if_type == NET_IF_ETHERTAP ? 1516 : 1514);
#else
                        length = read(fd, Mac2HostAddr(packet), 1514);
#endif
                        if (length < 14)
                                break;

#if MONITOR
                        bug("Receiving Ethernet packet:\n");
                        for (int i=0; i<length; i++) {
                                bug("%02x ", ReadMacInt8(packet + i));
                        }
                        bug("\n");
#endif

                        // Pointer to packet data (Ethernet header)
                        uint32 p = packet;
#if defined(__linux__)
                        if (net_if_type == NET_IF_ETHERTAP) {
                                p += 2;                 // Linux ethertap has two random bytes before the packet
                                length -= 2;
                        }
#endif

                        // Get packet type
                        uint16 type = ReadMacInt16(p + 12);

                        // Look for protocol
                        uint16 search_type = (type <= 1500 ? 0 : type);
                        if (net_protocols.find(search_type) == net_protocols.end())
                                continue;
                        uint32 handler = net_protocols[search_type];

                        // No default handler
                        if (handler == 0)
                                continue;

                        // Copy header to RHA
                        Mac2Mac_memcpy(ether_data + ed_RHA, p, 14);
                        D(bug(" header %08x%04x %08x%04x %04x\n", ReadMacInt32(ether_data + ed_RHA), ReadMacInt16(ether_data + ed_RHA + 4), ReadMacInt32(ether_data + ed_RHA + 6), ReadMacInt16(ether_data + ed_RHA + 10), ReadMacInt16(ether_data + ed_RHA + 12)));

                        // Call protocol handler
                        M68kRegisters r;
                        r.d[0] = type;                                                                  // Packet type
                        r.d[1] = length - 14;                                                   // Remaining packet length (without header, for ReadPacket)
                        r.a[0] = p + 14;                                                                // Pointer to packet (Mac address, for ReadPacket)
                        r.a[3] = ether_data + ed_RHA + 14;                              // Pointer behind header in RHA
                        r.a[4] = ether_data + ed_ReadPacket;                    // Pointer to ReadPacket/ReadRest routines
                        D(bug(" calling protocol handler %08x, type %08x, length %08x, data %08x, rha %08x, read_packet %08x\n", handler, r.d[0], r.d[1], r.a[0], r.a[3], r.a[4]));
                        Execute68k(handler, &r);
                }
        }

        // Acknowledge interrupt to reception thread
        D(bug(" EtherIRQ done\n"));
        sem_post(&int_ack);
}
Revision:	1.20
Committed:	2005-05-15T17:22:12Z (19 years, 6 months ago) by gbeauche
Branch:	MAIN
Changes since 1.19:	+29 -26 lines
Log Message:	Fix and factor out ether_exit(). Pitifully, MacOS X 10.2 does not make select() a cancellation point when it is passed a NULL timeout. Workarounded in receive_func() with a full inline of poll_fd() + pthread_testcancel().
#	User	Rev	Content
1	cebix	1.1	/*
2			* ether_unix.cpp - Ethernet device driver, Unix specific stuff (Linux and FreeBSD)
3			*
4	gbeauche	1.13	* Basilisk II (C) 1997-2005 Christian Bauer
5	cebix	1.1	*
6			* This program is free software; you can redistribute it and/or modify
7			* it under the terms of the GNU General Public License as published by
8			* the Free Software Foundation; either version 2 of the License, or
9			* (at your option) any later version.
10			*
11			* This program is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			* GNU General Public License for more details.
15			*
16			* You should have received a copy of the GNU General Public License
17			* along with this program; if not, write to the Free Software
18			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19			*/
20
21			#include "sysdeps.h"
22
23	gbeauche	1.17	#ifdef HAVE_SYS_POLL_H
24			#include <sys/poll.h>
25			#endif
26	cebix	1.1	#include <sys/ioctl.h>
27	cebix	1.3	#include <sys/socket.h>
28	gbeauche	1.9	#include <sys/wait.h>
29	cebix	1.3	#include <netinet/in.h>
30	cebix	1.1	#include <pthread.h>
31			#include <semaphore.h>
32			#include <errno.h>
33			#include <stdio.h>
34	cebix	1.3	#include <map>
35	cebix	1.2
36	gbeauche	1.17	#if defined(__FreeBSD__) \|\| defined(sgi) \|\| (defined(__APPLE__) && defined(__MACH__))
37	cebix	1.1	#include <net/if.h>
38			#endif
39
40	gbeauche	1.9	#if defined(HAVE_LINUX_IF_H) && defined(HAVE_LINUX_IF_TUN_H)
41			#include <linux/if.h>
42			#include <linux/if_tun.h>
43			#endif
44
45			#if defined(HAVE_NET_IF_H) && defined(HAVE_NET_IF_TUN_H)
46			#include <net/if.h>
47			#include <net/if_tun.h>
48			#endif
49
50	gbeauche	1.18	#ifdef HAVE_SLIRP
51	gbeauche	1.16	#include "libslirp.h"
52	gbeauche	1.18	#endif
53	gbeauche	1.15
54	cebix	1.1	#include "cpu_emulation.h"
55			#include "main.h"
56			#include "macos_util.h"
57			#include "prefs.h"
58			#include "user_strings.h"
59			#include "ether.h"
60			#include "ether_defs.h"
61
62	cebix	1.3	#ifndef NO_STD_NAMESPACE
63			using std::map;
64			#endif
65
66	cebix	1.1	#define DEBUG 0
67			#include "debug.h"
68
69			#define MONITOR 0
70
71
72	gbeauche	1.9	// Ethernet device types
73			enum {
74			NET_IF_SHEEPNET,
75			NET_IF_ETHERTAP,
76			NET_IF_TUNTAP,
77	gbeauche	1.15	NET_IF_SLIRP
78	gbeauche	1.9	};
79
80			// Constants
81			static const char ETHERCONFIG_FILE_NAME[] = DATADIR "/tunconfig";
82
83	cebix	1.1	// Global variables
84			static int fd = -1; // fd of sheep_net device
85			static pthread_t ether_thread; // Packet reception thread
86			static pthread_attr_t ether_thread_attr; // Packet reception thread attributes
87			static bool thread_active = false; // Flag: Packet reception thread installed
88			static sem_t int_ack; // Interrupt acknowledge semaphore
89	cebix	1.2	static bool udp_tunnel; // Flag: UDP tunnelling active, fd is the socket descriptor
90	gbeauche	1.9	static int net_if_type = -1; // Ethernet device type
91	gbeauche	1.10	static char *net_if_name = NULL; // TUN/TAP device name
92	gbeauche	1.9	static const char *net_if_script = NULL; // Network config script
93	gbeauche	1.15	static pthread_t slirp_thread; // Slirp reception thread
94			static bool slirp_thread_active = false; // Flag: Slirp reception threadinstalled
95			static int slirp_output_fd = -1; // fd of slirp output pipe
96	cebix	1.1
97	cebix	1.3	// Attached network protocols, maps protocol type to MacOS handler address
98			static map<uint16, uint32> net_protocols;
99
100	cebix	1.1	// Prototypes
101			static void receive_func(void arg);
102	gbeauche	1.15	static void slirp_receive_func(void arg);
103	gbeauche	1.17	static int poll_fd(int fd);
104	cebix	1.1
105
106			/*
107	cebix	1.2	* Start packet reception thread
108			*/
109
110			static bool start_thread(void)
111			{
112			if (sem_init(&int_ack, 0, 0) < 0) {
113			printf("WARNING: Cannot init semaphore");
114			return false;
115			}
116
117	cebix	1.7	Set_pthread_attr(&ether_thread_attr, 1);
118	cebix	1.2	thread_active = (pthread_create(&ether_thread, &ether_thread_attr, receive_func, NULL) == 0);
119			if (!thread_active) {
120			printf("WARNING: Cannot start Ethernet thread");
121			return false;
122			}
123
124	gbeauche	1.15	#ifdef HAVE_SLIRP
125			if (net_if_type == NET_IF_SLIRP) {
126			slirp_thread_active = (pthread_create(&slirp_thread, NULL, slirp_receive_func, NULL) == 0);
127			if (!slirp_thread_active) {
128			printf("WARNING: Cannot start slirp reception thread\n");
129			return false;
130			}
131			}
132			#endif
133
134	cebix	1.2	return true;
135			}
136
137
138			/*
139			* Stop packet reception thread
140			*/
141
142			static void stop_thread(void)
143			{
144	gbeauche	1.15	#ifdef HAVE_SLIRP
145			if (slirp_thread_active) {
146	gbeauche	1.20	#ifdef HAVE_PTHREAD_CANCEL
147	gbeauche	1.15	pthread_cancel(slirp_thread);
148	gbeauche	1.20	#endif
149	gbeauche	1.15	pthread_join(slirp_thread, NULL);
150			slirp_thread_active = false;
151			}
152			#endif
153
154	cebix	1.2	if (thread_active) {
155	gbeauche	1.20	#ifdef HAVE_PTHREAD_CANCEL
156	cebix	1.2	pthread_cancel(ether_thread);
157	gbeauche	1.20	#endif
158	cebix	1.2	pthread_join(ether_thread, NULL);
159			sem_destroy(&int_ack);
160			thread_active = false;
161			}
162			}
163
164
165			/*
166	gbeauche	1.9	* Execute network script up\|down
167			*/
168
169			static bool execute_network_script(const char *action)
170			{
171			if (net_if_script == NULL \|\| net_if_name == NULL)
172			return false;
173
174			int pid = fork();
175			if (pid >= 0) {
176			if (pid == 0) {
177			char *args[4];
178			args[0] = (char *)net_if_script;
179	gbeauche	1.10	args[1] = net_if_name;
180	gbeauche	1.9	args[2] = (char *)action;
181			args[3] = NULL;
182			execv(net_if_script, args);
183			exit(1);
184			}
185			int status;
186			while (waitpid(pid, &status, 0) != pid);
187			return WIFEXITED(status) && WEXITSTATUS(status) == 0;
188			}
189
190			return false;
191			}
192
193
194			/*
195	cebix	1.1	* Initialization
196			*/
197
198	cebix	1.2	bool ether_init(void)
199	cebix	1.1	{
200			int nonblock = 1;
201			char str[256];
202
203			// Do nothing if no Ethernet device specified
204			const char *name = PrefsFindString("ether");
205			if (name == NULL)
206	cebix	1.2	return false;
207	cebix	1.1
208	gbeauche	1.9	// Determine Ethernet device type
209			net_if_type = -1;
210			if (strncmp(name, "tap", 3) == 0)
211			net_if_type = NET_IF_ETHERTAP;
212			#if ENABLE_TUNTAP
213			else if (strcmp(name, "tun") == 0)
214			net_if_type = NET_IF_TUNTAP;
215			#endif
216	gbeauche	1.15	#ifdef HAVE_SLIRP
217			else if (strcmp(name, "slirp") == 0)
218			net_if_type = NET_IF_SLIRP;
219			#endif
220	gbeauche	1.9	else
221			net_if_type = NET_IF_SHEEPNET;
222	cebix	1.1
223	gbeauche	1.15	#ifdef HAVE_SLIRP
224			// Initialize slirp library
225			if (net_if_type == NET_IF_SLIRP) {
226			slirp_init();
227
228			// Open slirp output pipe
229			int fds[2];
230			if (pipe(fds) < 0)
231			return false;
232			fd = fds[0];
233			slirp_output_fd = fds[1];
234			}
235			#endif
236
237	gbeauche	1.11	// Open sheep_net or ethertap or TUN/TAP device
238	cebix	1.1	char dev_name[16];
239	gbeauche	1.9	switch (net_if_type) {
240			case NET_IF_ETHERTAP:
241	cebix	1.1	sprintf(dev_name, "/dev/%s", name);
242	gbeauche	1.9	break;
243			case NET_IF_TUNTAP:
244	gbeauche	1.11	strcpy(dev_name, "/dev/net/tun");
245	gbeauche	1.9	break;
246			case NET_IF_SHEEPNET:
247	cebix	1.1	strcpy(dev_name, "/dev/sheep_net");
248	gbeauche	1.9	break;
249			}
250	gbeauche	1.15	if (net_if_type != NET_IF_SLIRP) {
251			fd = open(dev_name, O_RDWR);
252			if (fd < 0) {
253			sprintf(str, GetString(STR_NO_SHEEP_NET_DRIVER_WARN), dev_name, strerror(errno));
254			WarningAlert(str);
255			goto open_error;
256			}
257	cebix	1.1	}
258
259	gbeauche	1.9	#if ENABLE_TUNTAP
260			// Open TUN/TAP interface
261			if (net_if_type == NET_IF_TUNTAP) {
262			struct ifreq ifr;
263			memset(&ifr, 0, sizeof(ifr));
264			ifr.ifr_flags = IFF_TAP \| IFF_NO_PI;
265			strcpy(ifr.ifr_name, "tun%d");
266			if (ioctl(fd, TUNSETIFF, (void *) &ifr) != 0) {
267			sprintf(str, GetString(STR_SHEEP_NET_ATTACH_WARN), strerror(errno));
268			WarningAlert(str);
269			goto open_error;
270			}
271
272			// Get network config script file path
273			net_if_script = PrefsFindString("etherconfig");
274			if (net_if_script == NULL)
275			net_if_script = ETHERCONFIG_FILE_NAME;
276
277			// Start network script up
278			if (net_if_script == NULL) {
279			sprintf(str, GetString(STR_TUN_TAP_CONFIG_WARN), "script not found");
280			WarningAlert(str);
281			goto open_error;
282			}
283	gbeauche	1.10	net_if_name = strdup(ifr.ifr_name);
284	gbeauche	1.9	if (!execute_network_script("up")) {
285			sprintf(str, GetString(STR_TUN_TAP_CONFIG_WARN), "script execute error");
286			WarningAlert(str);
287			goto open_error;
288			}
289			D(bug("Connected to host network interface: %s\n", net_if_name));
290			}
291			#endif
292
293	cebix	1.1	#if defined(__linux__)
294			// Attach sheep_net to selected Ethernet card
295	gbeauche	1.9	if (net_if_type == NET_IF_SHEEPNET && ioctl(fd, SIOCSIFLINK, name) < 0) {
296	cebix	1.1	sprintf(str, GetString(STR_SHEEP_NET_ATTACH_WARN), strerror(errno));
297			WarningAlert(str);
298			goto open_error;
299			}
300			#endif
301
302			// Set nonblocking I/O
303			ioctl(fd, FIONBIO, &nonblock);
304
305			// Get Ethernet address
306	gbeauche	1.9	if (net_if_type == NET_IF_ETHERTAP) {
307	cebix	1.1	pid_t p = getpid(); // If configured for multicast, ethertap requires that the lower 32 bit of the Ethernet address are our PID
308			ether_addr[0] = 0xfe;
309			ether_addr[1] = 0xfd;
310			ether_addr[2] = p >> 24;
311			ether_addr[3] = p >> 16;
312			ether_addr[4] = p >> 8;
313			ether_addr[5] = p;
314	gbeauche	1.15	#ifdef HAVE_SLIRP
315			} else if (net_if_type == NET_IF_SLIRP) {
316			ether_addr[0] = 0x52;
317			ether_addr[1] = 0x54;
318			ether_addr[2] = 0x00;
319			ether_addr[3] = 0x12;
320			ether_addr[4] = 0x34;
321			ether_addr[5] = 0x56;
322			#endif
323	cebix	1.1	} else
324			ioctl(fd, SIOCGIFADDR, ether_addr);
325			D(bug("Ethernet address %02x %02x %02x %02x %02x %02x\n", ether_addr[0], ether_addr[1], ether_addr[2], ether_addr[3], ether_addr[4], ether_addr[5]));
326
327			// Start packet reception thread
328	cebix	1.2	if (!start_thread())
329	cebix	1.1	goto open_error;
330
331			// Everything OK
332	cebix	1.2	return true;
333	cebix	1.1
334			open_error:
335	cebix	1.2	stop_thread();
336
337	cebix	1.1	if (fd > 0) {
338			close(fd);
339			fd = -1;
340			}
341	gbeauche	1.15	if (slirp_output_fd >= 0) {
342			close(slirp_output_fd);
343			slirp_output_fd = -1;
344			}
345	cebix	1.2	return false;
346	cebix	1.1	}
347
348
349			/*
350			* Deinitialization
351			*/
352
353	cebix	1.2	void ether_exit(void)
354	cebix	1.1	{
355	gbeauche	1.20	// Stop reception threads
356			stop_thread();
357	cebix	1.1
358	gbeauche	1.10	// Shut down TUN/TAP interface
359			if (net_if_type == NET_IF_TUNTAP)
360			execute_network_script("down");
361
362			// Free TUN/TAP device name
363			if (net_if_name)
364			free(net_if_name);
365
366	cebix	1.1	// Close sheep_net device
367			if (fd > 0)
368			close(fd);
369	gbeauche	1.15
370			// Close slirp output buffer
371			if (slirp_output_fd > 0)
372			close(slirp_output_fd);
373	cebix	1.1	}
374
375
376			/*
377			* Reset
378			*/
379
380	cebix	1.3	void ether_reset(void)
381	cebix	1.1	{
382	cebix	1.3	net_protocols.clear();
383	cebix	1.1	}
384
385
386			/*
387			* Add multicast address
388			*/
389
390			int16 ether_add_multicast(uint32 pb)
391			{
392	gbeauche	1.15	switch (net_if_type) {
393			case NET_IF_ETHERTAP:
394			case NET_IF_SHEEPNET:
395			if (ioctl(fd, SIOCADDMULTI, Mac2HostAddr(pb + eMultiAddr)) < 0) {
396			D(bug("WARNING: Couldn't enable multicast address\n"));
397			if (net_if_type == NET_IF_ETHERTAP)
398			return noErr;
399			else
400			return eMultiErr;
401			}
402			default:
403	cebix	1.1	return noErr;
404	gbeauche	1.15	}
405	cebix	1.1	}
406
407
408			/*
409			* Delete multicast address
410			*/
411
412			int16 ether_del_multicast(uint32 pb)
413			{
414	gbeauche	1.15	switch (net_if_type) {
415			case NET_IF_ETHERTAP:
416			case NET_IF_SHEEPNET:
417			if (ioctl(fd, SIOCDELMULTI, Mac2HostAddr(pb + eMultiAddr)) < 0) {
418			D(bug("WARNING: Couldn't disable multicast address\n"));
419			return eMultiErr;
420			}
421			default:
422	cebix	1.1	return noErr;
423	gbeauche	1.15	}
424	cebix	1.1	}
425
426
427			/*
428			* Attach protocol handler
429			*/
430
431			int16 ether_attach_ph(uint16 type, uint32 handler)
432			{
433	cebix	1.3	if (net_protocols.find(type) != net_protocols.end())
434	cebix	1.1	return lapProtErr;
435	cebix	1.3	net_protocols[type] = handler;
436			return noErr;
437	cebix	1.1	}
438
439
440			/*
441			* Detach protocol handler
442			*/
443
444			int16 ether_detach_ph(uint16 type)
445			{
446	cebix	1.3	if (net_protocols.erase(type) == 0)
447	cebix	1.1	return lapProtErr;
448	cebix	1.3	return noErr;
449	cebix	1.1	}
450
451
452			/*
453			* Transmit raw ethernet packet
454			*/
455
456			int16 ether_write(uint32 wds)
457			{
458			// Copy packet to buffer
459			uint8 packet[1516], *p = packet;
460			int len = 0;
461			#if defined(__linux__)
462	gbeauche	1.9	if (net_if_type == NET_IF_ETHERTAP) {
463	cebix	1.1	*p++ = 0; // Linux ethertap discards the first 2 bytes
464			*p++ = 0;
465			len += 2;
466			}
467			#endif
468	cebix	1.2	len += ether_wds_to_buffer(wds, p);
469	cebix	1.1
470			#if MONITOR
471			bug("Sending Ethernet packet:\n");
472			for (int i=0; i<len; i++) {
473			bug("%02x ", packet[i]);
474			}
475			bug("\n");
476			#endif
477
478			// Transmit packet
479	gbeauche	1.15	#ifdef HAVE_SLIRP
480			if (net_if_type == NET_IF_SLIRP) {
481			slirp_input(packet, len);
482			return noErr;
483			} else
484			#endif
485	cebix	1.1	if (write(fd, packet, len) < 0) {
486			D(bug("WARNING: Couldn't transmit packet\n"));
487			return excessCollsns;
488			} else
489			return noErr;
490			}
491
492
493			/*
494	cebix	1.2	* Start UDP packet reception thread
495			*/
496
497			bool ether_start_udp_thread(int socket_fd)
498			{
499			fd = socket_fd;
500			udp_tunnel = true;
501			return start_thread();
502			}
503
504
505			/*
506			* Stop UDP packet reception thread
507			*/
508
509			void ether_stop_udp_thread(void)
510			{
511			stop_thread();
512			fd = -1;
513			}
514
515
516			/*
517	gbeauche	1.15	* SLIRP output buffer glue
518			*/
519
520			#ifdef HAVE_SLIRP
521			int slirp_can_output(void)
522			{
523			return 1;
524			}
525
526			void slirp_output(const uint8 *packet, int len)
527			{
528			write(slirp_output_fd, packet, len);
529			}
530
531			void slirp_receive_func(void arg)
532			{
533			for (;;) {
534			// Wait for packets to arrive
535			fd_set rfds, wfds, xfds;
536			int nfds;
537			struct timeval tv;
538
539			nfds = -1;
540			FD_ZERO(&rfds);
541			FD_ZERO(&wfds);
542			FD_ZERO(&xfds);
543			slirp_select_fill(&nfds, &rfds, &wfds, &xfds);
544			tv.tv_sec = 0;
545			tv.tv_usec = 16667;
546			if (select(nfds + 1, &rfds, &wfds, &xfds, &tv) >= 0)
547			slirp_select_poll(&rfds, &wfds, &xfds);
548	gbeauche	1.20
549			#ifdef HAVE_PTHREAD_TESTCANCEL
550			// Explicit cancellation point if select() was not covered
551			// This seems to be the case on MacOS X 10.2
552			pthread_testcancel();
553			#endif
554	gbeauche	1.15	}
555			return NULL;
556			}
557			#else
558			int slirp_can_output(void)
559			{
560			return 0;
561			}
562
563			void slirp_output(const uint8 *packet, int len)
564			{
565			}
566			#endif
567
568
569			/*
570	cebix	1.1	* Packet reception thread
571			*/
572
573			static void receive_func(void arg)
574			{
575			for (;;) {
576
577			// Wait for packets to arrive
578	gbeauche	1.20	#if HAVE_POLL
579			struct pollfd pf = {fd, POLLIN, 0};
580			int res = poll(&pf, 1, -1);
581			#else
582			fd_set rfds;
583			FD_ZERO(&rfds);
584			FD_SET(fd, &rfds);
585			// A NULL timeout could cause select() to block indefinitely,
586			// even if it is supposed to be a cancellation point [MacOS X]
587			struct timeval tv = { 0, 20000 };
588			int res = select(fd + 1, &rfds, NULL, NULL, &tv);
589			#ifdef HAVE_PTHREAD_TESTCANCEL
590			pthread_testcancel();
591			#endif
592			if (res == 0 \|\| (res == -1 && errno == EINTR))
593			continue;
594			#endif
595	cebix	1.1	if (res <= 0)
596			break;
597
598			// Trigger Ethernet interrupt
599			D(bug(" packet received, triggering Ethernet interrupt\n"));
600			SetInterruptFlag(INTFLAG_ETHER);
601			TriggerInterrupt();
602
603			// Wait for interrupt acknowledge by EtherInterrupt()
604			sem_wait(&int_ack);
605			}
606			return NULL;
607			}
608
609
610			/*
611			* Ethernet interrupt - activate deferred tasks to call IODone or protocol handlers
612			*/
613
614			void EtherInterrupt(void)
615			{
616			D(bug("EtherIRQ\n"));
617
618			// Call protocol handler for received packets
619	gbeauche	1.14	EthernetPacket ether_packet;
620			uint32 packet = ether_packet.addr();
621	cebix	1.2	ssize_t length;
622	cebix	1.1	for (;;) {
623
624	cebix	1.2	if (udp_tunnel) {
625
626			// Read packet from socket
627			struct sockaddr_in from;
628			socklen_t from_len = sizeof(from);
629	gbeauche	1.14	length = recvfrom(fd, Mac2HostAddr(packet), 1514, 0, (struct sockaddr *)&from, &from_len);
630	cebix	1.2	if (length < 14)
631			break;
632			ether_udp_read(packet, length, &from);
633
634			} else {
635
636			// Read packet from sheep_net device
637	cebix	1.1	#if defined(__linux__)
638	gbeauche	1.14	length = read(fd, Mac2HostAddr(packet), net_if_type == NET_IF_ETHERTAP ? 1516 : 1514);
639	cebix	1.1	#else
640	gbeauche	1.14	length = read(fd, Mac2HostAddr(packet), 1514);
641	cebix	1.1	#endif
642	cebix	1.2	if (length < 14)
643			break;
644	cebix	1.1
645			#if MONITOR
646	cebix	1.2	bug("Receiving Ethernet packet:\n");
647			for (int i=0; i<length; i++) {
648	gbeauche	1.14	bug("%02x ", ReadMacInt8(packet + i));
649	cebix	1.2	}
650			bug("\n");
651	cebix	1.1	#endif
652
653	cebix	1.2	// Pointer to packet data (Ethernet header)
654	gbeauche	1.14	uint32 p = packet;
655	cebix	1.1	#if defined(__linux__)
656	gbeauche	1.9	if (net_if_type == NET_IF_ETHERTAP) {
657	cebix	1.2	p += 2; // Linux ethertap has two random bytes before the packet
658			length -= 2;
659			}
660	cebix	1.1	#endif
661
662	cebix	1.2	// Get packet type
663	gbeauche	1.14	uint16 type = ReadMacInt16(p + 12);
664	cebix	1.1
665	cebix	1.2	// Look for protocol
666	cebix	1.3	uint16 search_type = (type <= 1500 ? 0 : type);
667			if (net_protocols.find(search_type) == net_protocols.end())
668	cebix	1.2	continue;
669	cebix	1.3	uint32 handler = net_protocols[search_type];
670	cebix	1.2
671			// No default handler
672	cebix	1.3	if (handler == 0)
673	cebix	1.2	continue;
674
675			// Copy header to RHA
676	gbeauche	1.14	Mac2Mac_memcpy(ether_data + ed_RHA, p, 14);
677	cebix	1.2	D(bug(" header %08x%04x %08x%04x %04x\n", ReadMacInt32(ether_data + ed_RHA), ReadMacInt16(ether_data + ed_RHA + 4), ReadMacInt32(ether_data + ed_RHA + 6), ReadMacInt16(ether_data + ed_RHA + 10), ReadMacInt16(ether_data + ed_RHA + 12)));
678
679			// Call protocol handler
680			M68kRegisters r;
681			r.d[0] = type; // Packet type
682			r.d[1] = length - 14; // Remaining packet length (without header, for ReadPacket)
683	gbeauche	1.14	r.a[0] = p + 14; // Pointer to packet (Mac address, for ReadPacket)
684	cebix	1.2	r.a[3] = ether_data + ed_RHA + 14; // Pointer behind header in RHA
685			r.a[4] = ether_data + ed_ReadPacket; // Pointer to ReadPacket/ReadRest routines
686	cebix	1.3	D(bug(" calling protocol handler %08x, type %08x, length %08x, data %08x, rha %08x, read_packet %08x\n", handler, r.d[0], r.d[1], r.a[0], r.a[3], r.a[4]));
687			Execute68k(handler, &r);
688	cebix	1.2	}
689	cebix	1.1	}
690
691			// Acknowledge interrupt to reception thread
692			D(bug(" EtherIRQ done\n"));
693			sem_post(&int_ack);
694			}