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/* |
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* PearPC |
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* sysethtun.cc |
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* |
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* POSIX/UN*X-specific ethernet-tunnel access |
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* |
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* Copyright (C) 2003 Stefan Weyergraf |
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* |
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* code taken from Mac-on-Linux 0.9.68: |
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* Copyright (C) 1999-2002 Samuel Rydh (samuel@ibrium.se) |
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* |
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* darwin code taken from tinc 1.0.2: |
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* Copyright (C) 2001-2003 Ivo Timmermans <ivo@o2w.nl>, |
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* 2001-2003 Guus Sliepen <guus@sliepen.eu.org> |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License version 2 as |
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* published by the Free Software Foundation. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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*/ |
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|
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#include <cerrno> |
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#include <cstdio> |
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#include <cstdlib> |
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#include <cstring> |
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#include <unistd.h> |
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#include <sys/wait.h> |
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|
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#include "system/sysethtun.h" |
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#include "tools/snprintf.h" |
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#include "tools/data.h" |
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#include "tools/str.h" |
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|
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#ifdef HAVE_CONFIG_H |
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#include "config.h" |
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#endif |
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|
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#include "tools/except.h" |
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#include "system/sysethtun.h" |
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|
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#ifndef HAVE_SETENV |
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/* |
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* That is just to support BeOS R5, even Zeta has setenv() btw |
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* Note that leaks env, but we can't do anything about that |
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* (cf. glibc man page) |
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*/ |
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static int setenv(const char *name, const char *value, int overwrite) |
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{ |
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String tmpenv; |
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tmpenv.assignFormat("%s=%s", name, value); |
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char *env = strdup(tmpenv); /* LEAK! */ |
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putenv(env); |
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return 0; |
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} |
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#endif |
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|
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/** |
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* Unix ethernet tunnel devices should work using a file descriptor |
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*/ |
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class UnixEthTunDevice: public EthTunDevice { |
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protected: |
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int mFD; |
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public: |
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|
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UnixEthTunDevice() |
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{ |
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// super-class constructor MUST set mFD!!! |
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// this is yet another case where C++ constructors suck |
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// (ohh lovely Borland Pascal, where art thou?) |
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mFD = -1; |
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} |
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|
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virtual ~UnixEthTunDevice() |
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{ |
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} |
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|
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virtual uint recvPacket(void *buf, uint size) |
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{ |
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ssize_t e = ::read(mFD, buf, size); |
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if (e < 0) return 0; |
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return e; |
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} |
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|
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virtual int waitRecvPacket() |
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{ |
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fd_set rfds; |
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fd_set zerofds; |
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FD_ZERO(&rfds); |
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FD_ZERO(&zerofds); |
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if (mFD < 0) |
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return ENODEV; |
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FD_SET(mFD, &rfds); |
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|
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int e = select(mFD+1, &rfds, &zerofds, &zerofds, NULL); |
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if (e < 0) return errno; |
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return 0; |
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} |
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|
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virtual uint sendPacket(void *buf, uint size) |
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{ |
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ssize_t e = ::write(mFD, buf, size); |
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if (e < 0) return 0; |
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return e; |
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} |
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|
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virtual const char *devicePath() |
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{ |
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return NULL; |
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} |
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|
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virtual const char *upScript() |
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{ |
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return "scripts/ifppc_up.setuid"; |
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} |
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|
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virtual const char *downScript() |
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{ |
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return "scripts/ifppc_down.setuid"; |
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} |
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|
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// FIXME: How shall we configure networking??? This thing can only be a temporary solution |
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virtual int execIFConfigScript(const char *action, const char *interface) |
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{ |
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printf("UnixTun::execIFConfigScript(%s,%s)\n", action, interface); |
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int pid = fork(); |
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if (pid < 0) |
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printf("fork = %d, 0x%08x\n", pid, errno); |
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if (pid == 0) { |
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const char *progname; |
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if (strcmp(action, "up") == 0) { |
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progname = upScript(); |
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} else { |
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progname = downScript(); |
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} |
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setenv("PPC_INTERFACE", interface, 1); |
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printf("executing '%s' ...\n" |
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"********************************************************************************\n", progname); |
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execl(progname, progname, (char*)NULL); |
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printf("couldn't exec '%s': %s\n", progname, strerror(errno)); |
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exit(1); |
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} else if (pid != -1) { |
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int status; |
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waitpid(pid, &status, 0); |
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if (!WIFEXITED(status)) { |
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printf("program terminated abnormally...\n"); |
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return 1; |
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} |
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if (WEXITSTATUS(status)) { |
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printf("program terminated with exit code %d\n", WEXITSTATUS(status)); |
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return 1; |
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} |
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return 0; |
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} |
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return 1; |
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} |
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|
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}; // end of UnixEthTunDevice |
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|
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#if defined(HAVE_LINUX_TUN) || defined(HAVE_BEOS_TUN) |
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/* |
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* This is how it's done in Linux |
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*/ |
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|
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#include <sys/ioctl.h> |
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#include <sys/socket.h> |
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|
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#ifdef HAVE_LINUX_TUN |
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#include <asm/types.h> |
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#include <linux/netlink.h> |
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#include <linux/if.h> |
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#include <linux/if_tun.h> |
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#else /* BeOS */ |
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#include <net/if.h> |
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#include <linux/if_tun.h> // should be moved to net/ someday too... |
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#include <image.h> |
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#endif /* HAVE_LINUX_TUN */ |
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|
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#include <sys/types.h> |
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#include <sys/stat.h> |
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#include <fcntl.h> |
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|
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class LinuxLikeEthTunDevice: public UnixEthTunDevice { |
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protected: |
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String mIfName; |
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String mIfPrefix; |
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public: |
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LinuxLikeEthTunDevice(const char *netif_prefix) |
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: UnixEthTunDevice() |
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{ |
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// We will allocate the next available interface name |
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// First, trim passed interface name down to 6 letters. To prevent |
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// overflow attacks and shell attacks. |
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String netif_buffer(netif_prefix); |
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netif_buffer.crop(6); |
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for (int i=0; i < netif_buffer.length(); i++) { |
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char c = netif_buffer[i]; |
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// Delete all characters not suitable for below command |
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if (!(c >= 'a' && c <= 'z') |
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&& !(c >= 'A' && c <= 'Z') |
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&& !(c >= '0' && c <= '9') |
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&& (c != '_')) { |
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netif_buffer[i] = '_'; |
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} |
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} |
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mIfPrefix = netif_buffer; |
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} |
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|
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|
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int initDevice() |
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{ |
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|
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/* allocate tun device */ |
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if ((mFD = ::open(devicePath(), O_RDWR)) < 0) { |
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const char *err = ::strerror(errno); |
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throw MsgfException("Failed to open %s (%s)", devicePath(), err); |
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} |
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|
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struct ifreq ifr; |
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::memset(&ifr, 0, sizeof(ifr)); |
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ifr.ifr_flags = IFF_TAP | IFF_NO_PI; |
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|
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if (::strlen(mIfName.contentChar())+1 > IFNAMSIZ) { |
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throw MsgfException("Interface name too long (%d > %d bytes)" |
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" in '%y'\n", ::strlen(mIfName.contentChar())+1, IFNAMSIZ, &mIfName); |
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} |
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|
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::strncpy(ifr.ifr_name, mIfName.contentChar(), IFNAMSIZ); |
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if (::ioctl(mFD, TUNSETIFF, &ifr) < 0) { |
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const char *err = ::strerror(errno); |
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::close(mFD); |
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throw MsgfException("TUNSETIFF failed (%s).", err); |
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} |
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|
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/* don't checksum */ |
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::ioctl(mFD, TUNSETNOCSUM, 1); |
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|
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/* Configure device */ |
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if (execIFConfigScript("up", mIfName.contentChar())) { |
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::close(mFD); |
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throw MsgException("error executing ifconfig."); |
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} |
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return 0; |
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} |
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|
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int shutdownDevice() |
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{ |
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/* tear down the device */ |
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execIFConfigScript("down", mIfName.contentChar()); |
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::close(mFD); |
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return 0; |
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} |
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|
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virtual uint getWriteFramePrefix() |
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{ |
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return 0; |
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} |
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|
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virtual const char *devicePath() |
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{ |
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return "/dev/net/tun"; |
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} |
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|
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}; // end of LinuxLikeEthTunDevice |
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|
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#ifdef HAVE_LINUX_TUN |
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|
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class LinuxEthTunDevice: public LinuxLikeEthTunDevice { |
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public: |
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LinuxEthTunDevice(const char *netif_prefix) |
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: LinuxLikeEthTunDevice(netif_prefix) |
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{ |
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for (int counter = 0; counter < 10; counter++) { |
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String command; |
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command.assignFormat("ifconfig %y%d", &mIfPrefix, counter); |
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// FIXME: Is there anything else than command() that I can use here? |
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// Seems a fork&exec is a bit too much... |
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int ret = system(command.contentChar()); |
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if (WEXITSTATUS(ret)) { |
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mIfName.assignFormat("%y%d", &mIfPrefix, counter); |
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ht_printf("mIfName = %y\n", &mIfName); |
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break; |
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} |
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} |
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// FIXME:There is more than 10 interfaces taken at this time. What should we do ? |
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if (mIfName == (String)"") |
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throw MsgfException("There are already 10 interfaces configured. We don't support more than that currently."); |
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} |
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|
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}; // end of LinuxEthTunDevice |
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|
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EthTunDevice *createEthernetTunnel() |
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{ |
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return new LinuxEthTunDevice("ppc" /* FIXME: hardcoding */); |
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} |
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|
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#else /* BeOS */ |
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|
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class BeOSEthTunDevice: public LinuxLikeEthTunDevice { |
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public: |
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BeOSEthTunDevice(const char *netif_name) |
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: LinuxLikeEthTunDevice(netif_name) |
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{ |
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int s = socket(AF_INET, SOCK_DGRAM, 0); |
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if (s < 0) |
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throw MsgfException("Can't get a socket to enumerate interfaces."); |
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for (int counter = 0; counter < 10; counter++) { |
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String ifName; |
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ifreq_t ifr; |
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ifName.assignFormat("%y%d", &mIfPrefix, counter); |
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|
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strncpy(ifr.ifr_name, ifName, IFNAMSIZ); |
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if (::ioctl(s, SIOCGIFADDR, &ifr, sizeof(ifr)) < 0) { |
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mIfName.assignFormat("%y%d", &mIfPrefix, counter); // is it safe ? |
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ht_printf("mIfName = %y\n", &mIfName); |
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break; |
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} |
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} |
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close(s); |
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// FIXME:There is more than 10 interfaces taken at this time. What should we do ? |
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if (mIfName == (String)"") |
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throw MsgfException("There are already 10 interfaces configured. We don't support more than that currently."); |
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} |
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|
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virtual const char *devicePath() |
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{ |
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return TUN_DEVICE; |
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} |
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|
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virtual const char *upScript() |
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{ |
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return "scripts/ifppc_up.beos"; |
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} |
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|
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virtual const char *downScript() |
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{ |
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return "scripts/ifppc_down.beos"; |
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} |
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|
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|
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#if 1 |
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// FIXME: How shall we configure networking??? This thing can only be a temporary solution |
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// XXX: BeOS doesn't seem to like forking from PearPC... out of swap !? |
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// what you get from playing dirty tricks. :) |
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virtual int execIFConfigScript(const char *action, const char *interface) |
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{ |
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thread_id tid; |
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status_t status; |
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const char *progname; |
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if (strcmp(action, "up") == 0) { |
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progname = upScript(); |
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} else { |
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progname = downScript(); |
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} |
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const char *sargv[] = { "/bin/sh", progname, NULL }; |
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int sargc = 2; |
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setenv("PPC_INTERFACE", interface, 1); |
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printf("executing '%s' ...\n" |
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"********************************************************************************\n", progname); |
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//execl(progname, progname, 0); |
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tid = load_image(sargc, sargv, (const char **)environ); |
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if ((tid < B_OK) || (resume_thread(tid) < B_OK)) { |
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printf("couldn't exec '%s': %s\n", progname, strerror(tid)); |
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return 1; |
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} |
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sleep(1); |
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wait_for_thread(tid, &status); |
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if (!WIFEXITED(status)) { |
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printf("program terminated abnormally...\n"); |
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return 1; |
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} |
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if (WEXITSTATUS(status)) { |
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printf("program terminated with exit code %d\n", WEXITSTATUS(status)); |
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return 1; |
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} |
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return 0; |
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} |
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#endif |
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}; // end of BeOSEthTunDevice |
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|
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EthTunDevice *createEthernetTunnel() |
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{ |
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return new BeOSEthTunDevice("ppc" /* FIXME: hardcoding */); |
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} |
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|
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#endif /* HAVE_LINUX_TUN */ |
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|
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#elif (defined(__APPLE__) && defined(__MACH__)) || defined (__FreeBSD__) |
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/* |
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* This is how it's done in Darwin, Mac OS X or FreeBSD |
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*/ |
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|
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/* |
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Interaction with Darwin/Mac OS X "tun" device driver |
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|
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See http://chrisp.de/en/projects/tunnel.html, |
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for source code and binaries of tunnel.kext : |
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|
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kextload /System/Library/Extensions/tunnel.kext |
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*/ |
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|
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#include <fcntl.h> |
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|
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#ifdef __FreeBSD__ |
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#define DEFAULT_DEVICE "/dev/tap0" |
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#else |
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#define DEFAULT_DEVICE "/dev/tun0" |
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#endif |
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|
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class SimpleEthTunDevice: public UnixEthTunDevice { |
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public: |
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SimpleEthTunDevice() |
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: UnixEthTunDevice() |
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{ |
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} |
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|
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int initDevice() |
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{ |
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/* allocate tun device */ |
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if ((mFD = ::open(DEFAULT_DEVICE, O_RDWR | O_NONBLOCK)) < 0) { |
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throw MsgException("Failed to open "DEFAULT_DEVICE"! Is tunnel.kext loaded?"); |
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} |
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return 0; |
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} |
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|
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int shutdownDevice() |
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{ |
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} |
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|
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virtual uint getWriteFramePrefix() |
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{ |
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return 0; |
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} |
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|
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}; // end of SimpleEthTunDevice |
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|
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EthTunDevice *createEthernetTunnel() |
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{ |
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return new SimpleEthTunDevice(); |
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} |
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|
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#else |
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/* |
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* System provides no ethernet tunnel |
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*/ |
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|
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EthTunDevice *createEthernetTunnel() |
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{ |
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throw MsgException("Your system has no support for ethernet tunnels."); |
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} |
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|
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#endif |