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- /***************************************************************************
- * _ _ ____ _
- * Project ___| | | | _ \| |
- * / __| | | | |_) | |
- * | (__| |_| | _ <| |___
- * \___|\___/|_| \_\_____|
- *
- * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
- *
- * This software is licensed as described in the file COPYING, which
- * you should have received as part of this distribution. The terms
- * are also available at https://curl.se/docs/copyright.html.
- *
- * You may opt to use, copy, modify, merge, publish, distribute and/or sell
- * copies of the Software, and permit persons to whom the Software is
- * furnished to do so, under the terms of the COPYING file.
- *
- * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
- * KIND, either express or implied.
- *
- ***************************************************************************/
- #include "server_setup.h"
- /* Purpose
- *
- * 1. Accept a TCP connection on a custom port (IPv4 or IPv6), or connect
- * to a given (localhost) port.
- *
- * 2. Get commands on STDIN. Pass data on to the TCP stream.
- * Get data from TCP stream and pass on to STDOUT.
- *
- * This program is made to perform all the socket/stream/connection stuff for
- * the test suite's (perl) FTP server. Previously the perl code did all of
- * this by its own, but I decided to let this program do the socket layer
- * because of several things:
- *
- * o We want the perl code to work with rather old perl installations, thus
- * we cannot use recent perl modules or features.
- *
- * o We want IPv6 support for systems that provide it, and doing optional IPv6
- * support in perl seems if not impossible so at least awkward.
- *
- * o We want FTP-SSL support, which means that a connection that starts with
- * plain sockets needs to be able to "go SSL" in the midst. This would also
- * require some nasty perl stuff I'd rather avoid.
- *
- * (Source originally based on sws.c)
- */
- /*
- * Signal handling notes for sockfilt
- * ----------------------------------
- *
- * This program is a single-threaded process.
- *
- * This program is intended to be highly portable and as such it must be kept
- * as simple as possible, due to this the only signal handling mechanisms used
- * will be those of ANSI C, and used only in the most basic form which is good
- * enough for the purpose of this program.
- *
- * For the above reason and the specific needs of this program signals SIGHUP,
- * SIGPIPE and SIGALRM will be simply ignored on systems where this can be
- * done. If possible, signals SIGINT and SIGTERM will be handled by this
- * program as an indication to cleanup and finish execution as soon as
- * possible. This will be achieved with a single signal handler
- * 'exit_signal_handler' for both signals.
- *
- * The 'exit_signal_handler' upon the first SIGINT or SIGTERM received signal
- * will just set to one the global var 'got_exit_signal' storing in global var
- * 'exit_signal' the signal that triggered this change.
- *
- * Nothing fancy that could introduce problems is used, the program at certain
- * points in its normal flow checks if var 'got_exit_signal' is set and in
- * case this is true it just makes its way out of loops and functions in
- * structured and well behaved manner to achieve proper program cleanup and
- * termination.
- *
- * Even with the above mechanism implemented it is worthwhile to note that
- * other signals might still be received, or that there might be systems on
- * which it is not possible to trap and ignore some of the above signals.
- * This implies that for increased portability and reliability the program
- * must be coded as if no signal was being ignored or handled at all. Enjoy
- * it!
- */
- #ifdef HAVE_SIGNAL_H
- #include <signal.h>
- #endif
- #ifdef HAVE_NETINET_IN_H
- #include <netinet/in.h>
- #endif
- #ifdef HAVE_NETINET_IN6_H
- #include <netinet/in6.h>
- #endif
- #ifdef HAVE_ARPA_INET_H
- #include <arpa/inet.h>
- #endif
- #ifdef HAVE_NETDB_H
- #include <netdb.h>
- #endif
- #define ENABLE_CURLX_PRINTF
- /* make the curlx header define all printf() functions to use the curlx_*
- versions instead */
- #include "curlx.h" /* from the private lib dir */
- #include "getpart.h"
- #include "inet_pton.h"
- #include "util.h"
- #include "server_sockaddr.h"
- #include "warnless.h"
- /* include memdebug.h last */
- #include "memdebug.h"
- #ifdef USE_WINSOCK
- #undef EINTR
- #define EINTR 4 /* errno.h value */
- #undef EAGAIN
- #define EAGAIN 11 /* errno.h value */
- #undef ENOMEM
- #define ENOMEM 12 /* errno.h value */
- #undef EINVAL
- #define EINVAL 22 /* errno.h value */
- #endif
- #define DEFAULT_PORT 8999
- #ifndef DEFAULT_LOGFILE
- #define DEFAULT_LOGFILE "log/sockfilt.log"
- #endif
- const char *serverlogfile = DEFAULT_LOGFILE;
- static bool verbose = FALSE;
- static bool bind_only = FALSE;
- #ifdef ENABLE_IPV6
- static bool use_ipv6 = FALSE;
- #endif
- static const char *ipv_inuse = "IPv4";
- static unsigned short port = DEFAULT_PORT;
- static unsigned short connectport = 0; /* if non-zero, we activate this mode */
- enum sockmode {
- PASSIVE_LISTEN, /* as a server waiting for connections */
- PASSIVE_CONNECT, /* as a server, connected to a client */
- ACTIVE, /* as a client, connected to a server */
- ACTIVE_DISCONNECT /* as a client, disconnected from server */
- };
- #ifdef WIN32
- /*
- * read-wrapper to support reading from stdin on Windows.
- */
- static ssize_t read_wincon(int fd, void *buf, size_t count)
- {
- HANDLE handle = NULL;
- DWORD mode, rcount = 0;
- BOOL success;
- if(fd == fileno(stdin)) {
- handle = GetStdHandle(STD_INPUT_HANDLE);
- }
- else {
- return read(fd, buf, count);
- }
- if(GetConsoleMode(handle, &mode)) {
- success = ReadConsole(handle, buf, curlx_uztoul(count), &rcount, NULL);
- }
- else {
- success = ReadFile(handle, buf, curlx_uztoul(count), &rcount, NULL);
- }
- if(success) {
- return rcount;
- }
- errno = GetLastError();
- return -1;
- }
- #undef read
- #define read(a,b,c) read_wincon(a,b,c)
- /*
- * write-wrapper to support writing to stdout and stderr on Windows.
- */
- static ssize_t write_wincon(int fd, const void *buf, size_t count)
- {
- HANDLE handle = NULL;
- DWORD mode, wcount = 0;
- BOOL success;
- if(fd == fileno(stdout)) {
- handle = GetStdHandle(STD_OUTPUT_HANDLE);
- }
- else if(fd == fileno(stderr)) {
- handle = GetStdHandle(STD_ERROR_HANDLE);
- }
- else {
- return write(fd, buf, count);
- }
- if(GetConsoleMode(handle, &mode)) {
- success = WriteConsole(handle, buf, curlx_uztoul(count), &wcount, NULL);
- }
- else {
- success = WriteFile(handle, buf, curlx_uztoul(count), &wcount, NULL);
- }
- if(success) {
- return wcount;
- }
- errno = GetLastError();
- return -1;
- }
- #undef write
- #define write(a,b,c) write_wincon(a,b,c)
- #endif
- /*
- * fullread is a wrapper around the read() function. This will repeat the call
- * to read() until it actually has read the complete number of bytes indicated
- * in nbytes or it fails with a condition that cannot be handled with a simple
- * retry of the read call.
- */
- static ssize_t fullread(int filedes, void *buffer, size_t nbytes)
- {
- int error;
- ssize_t nread = 0;
- do {
- ssize_t rc = read(filedes,
- (unsigned char *)buffer + nread, nbytes - nread);
- if(got_exit_signal) {
- logmsg("signalled to die");
- return -1;
- }
- if(rc < 0) {
- error = errno;
- if((error == EINTR) || (error == EAGAIN))
- continue;
- logmsg("reading from file descriptor: %d,", filedes);
- logmsg("unrecoverable read() failure: (%d) %s",
- error, strerror(error));
- return -1;
- }
- if(rc == 0) {
- logmsg("got 0 reading from stdin");
- return 0;
- }
- nread += rc;
- } while((size_t)nread < nbytes);
- if(verbose)
- logmsg("read %zd bytes", nread);
- return nread;
- }
- /*
- * fullwrite is a wrapper around the write() function. This will repeat the
- * call to write() until it actually has written the complete number of bytes
- * indicated in nbytes or it fails with a condition that cannot be handled
- * with a simple retry of the write call.
- */
- static ssize_t fullwrite(int filedes, const void *buffer, size_t nbytes)
- {
- int error;
- ssize_t nwrite = 0;
- do {
- ssize_t wc = write(filedes, (const unsigned char *)buffer + nwrite,
- nbytes - nwrite);
- if(got_exit_signal) {
- logmsg("signalled to die");
- return -1;
- }
- if(wc < 0) {
- error = errno;
- if((error == EINTR) || (error == EAGAIN))
- continue;
- logmsg("writing to file descriptor: %d,", filedes);
- logmsg("unrecoverable write() failure: (%d) %s",
- error, strerror(error));
- return -1;
- }
- if(wc == 0) {
- logmsg("put 0 writing to stdout");
- return 0;
- }
- nwrite += wc;
- } while((size_t)nwrite < nbytes);
- if(verbose)
- logmsg("wrote %zd bytes", nwrite);
- return nwrite;
- }
- /*
- * read_stdin tries to read from stdin nbytes into the given buffer. This is a
- * blocking function that will only return TRUE when nbytes have actually been
- * read or FALSE when an unrecoverable error has been detected. Failure of this
- * function is an indication that the sockfilt process should terminate.
- */
- static bool read_stdin(void *buffer, size_t nbytes)
- {
- ssize_t nread = fullread(fileno(stdin), buffer, nbytes);
- if(nread != (ssize_t)nbytes) {
- logmsg("exiting...");
- return FALSE;
- }
- return TRUE;
- }
- /*
- * write_stdout tries to write to stdio nbytes from the given buffer. This is a
- * blocking function that will only return TRUE when nbytes have actually been
- * written or FALSE when an unrecoverable error has been detected. Failure of
- * this function is an indication that the sockfilt process should terminate.
- */
- static bool write_stdout(const void *buffer, size_t nbytes)
- {
- ssize_t nwrite = fullwrite(fileno(stdout), buffer, nbytes);
- if(nwrite != (ssize_t)nbytes) {
- logmsg("exiting...");
- return FALSE;
- }
- return TRUE;
- }
- static void lograw(unsigned char *buffer, ssize_t len)
- {
- char data[120];
- ssize_t i;
- unsigned char *ptr = buffer;
- char *optr = data;
- ssize_t width = 0;
- int left = sizeof(data);
- for(i = 0; i<len; i++) {
- switch(ptr[i]) {
- case '\n':
- msnprintf(optr, left, "\\n");
- width += 2;
- optr += 2;
- left -= 2;
- break;
- case '\r':
- msnprintf(optr, left, "\\r");
- width += 2;
- optr += 2;
- left -= 2;
- break;
- default:
- msnprintf(optr, left, "%c", (ISGRAPH(ptr[i]) ||
- ptr[i] == 0x20) ?ptr[i]:'.');
- width++;
- optr++;
- left--;
- break;
- }
- if(width>60) {
- logmsg("'%s'", data);
- width = 0;
- optr = data;
- left = sizeof(data);
- }
- }
- if(width)
- logmsg("'%s'", data);
- }
- #ifdef USE_WINSOCK
- /*
- * WinSock select() does not support standard file descriptors,
- * it can only check SOCKETs. The following function is an attempt
- * to re-create a select() function with support for other handle types.
- *
- * select() function with support for WINSOCK2 sockets and all
- * other handle types supported by WaitForMultipleObjectsEx() as
- * well as disk files, anonymous and names pipes, and character input.
- *
- * https://msdn.microsoft.com/en-us/library/windows/desktop/ms687028.aspx
- * https://msdn.microsoft.com/en-us/library/windows/desktop/ms741572.aspx
- */
- struct select_ws_wait_data {
- HANDLE handle; /* actual handle to wait for during select */
- HANDLE signal; /* internal event to signal handle trigger */
- HANDLE abort; /* internal event to abort waiting thread */
- HANDLE mutex; /* mutex to prevent event race-condition */
- };
- static DWORD WINAPI select_ws_wait_thread(LPVOID lpParameter)
- {
- struct select_ws_wait_data *data;
- HANDLE mutex, signal, handle, handles[2];
- INPUT_RECORD inputrecord;
- LARGE_INTEGER size, pos;
- DWORD type, length, ret;
- /* retrieve handles from internal structure */
- data = (struct select_ws_wait_data *) lpParameter;
- if(data) {
- handle = data->handle;
- handles[0] = data->abort;
- handles[1] = handle;
- signal = data->signal;
- mutex = data->mutex;
- free(data);
- }
- else
- return (DWORD)-1;
- /* retrieve the type of file to wait on */
- type = GetFileType(handle);
- switch(type) {
- case FILE_TYPE_DISK:
- /* The handle represents a file on disk, this means:
- * - WaitForMultipleObjectsEx will always be signalled for it.
- * - comparison of current position in file and total size of
- * the file can be used to check if we reached the end yet.
- *
- * Approach: Loop till either the internal event is signalled
- * or if the end of the file has already been reached.
- */
- while(WaitForMultipleObjectsEx(1, handles, FALSE, 0, FALSE)
- == WAIT_TIMEOUT) {
- ret = WaitForSingleObjectEx(mutex, 0, FALSE);
- if(ret == WAIT_OBJECT_0) {
- /* get total size of file */
- length = 0;
- size.QuadPart = 0;
- size.LowPart = GetFileSize(handle, &length);
- if((size.LowPart != INVALID_FILE_SIZE) ||
- (GetLastError() == NO_ERROR)) {
- size.HighPart = length;
- /* get the current position within the file */
- pos.QuadPart = 0;
- pos.LowPart = SetFilePointer(handle, 0, &pos.HighPart,
- FILE_CURRENT);
- if((pos.LowPart != INVALID_SET_FILE_POINTER) ||
- (GetLastError() == NO_ERROR)) {
- /* compare position with size, abort if not equal */
- if(size.QuadPart == pos.QuadPart) {
- /* sleep and continue waiting */
- SleepEx(0, FALSE);
- ReleaseMutex(mutex);
- continue;
- }
- }
- }
- /* there is some data available, stop waiting */
- logmsg("[select_ws_wait_thread] data available, DISK: %p", handle);
- SetEvent(signal);
- ReleaseMutex(mutex);
- break;
- }
- else if(ret == WAIT_ABANDONED) {
- /* we are not allowed to process this event, because select_ws
- is post-processing the signalled events and we must exit. */
- break;
- }
- }
- break;
- case FILE_TYPE_CHAR:
- /* The handle represents a character input, this means:
- * - WaitForMultipleObjectsEx will be signalled on any kind of input,
- * including mouse and window size events we do not care about.
- *
- * Approach: Loop till either the internal event is signalled
- * or we get signalled for an actual key-event.
- */
- while(WaitForMultipleObjectsEx(2, handles, FALSE, INFINITE, FALSE)
- == WAIT_OBJECT_0 + 1) {
- ret = WaitForSingleObjectEx(mutex, 0, FALSE);
- if(ret == WAIT_OBJECT_0) {
- /* check if this is an actual console handle */
- if(GetConsoleMode(handle, &ret)) {
- /* retrieve an event from the console buffer */
- length = 0;
- if(PeekConsoleInput(handle, &inputrecord, 1, &length)) {
- /* check if the event is not an actual key-event */
- if(length == 1 && inputrecord.EventType != KEY_EVENT) {
- /* purge the non-key-event and continue waiting */
- ReadConsoleInput(handle, &inputrecord, 1, &length);
- ReleaseMutex(mutex);
- continue;
- }
- }
- }
- /* there is some data available, stop waiting */
- logmsg("[select_ws_wait_thread] data available, CHAR: %p", handle);
- SetEvent(signal);
- ReleaseMutex(mutex);
- break;
- }
- else if(ret == WAIT_ABANDONED) {
- /* we are not allowed to process this event, because select_ws
- is post-processing the signalled events and we must exit. */
- break;
- }
- }
- break;
- case FILE_TYPE_PIPE:
- /* The handle represents an anonymous or named pipe, this means:
- * - WaitForMultipleObjectsEx will always be signalled for it.
- * - peek into the pipe and retrieve the amount of data available.
- *
- * Approach: Loop till either the internal event is signalled
- * or there is data in the pipe available for reading.
- */
- while(WaitForMultipleObjectsEx(1, handles, FALSE, 0, FALSE)
- == WAIT_TIMEOUT) {
- ret = WaitForSingleObjectEx(mutex, 0, FALSE);
- if(ret == WAIT_OBJECT_0) {
- /* peek into the pipe and retrieve the amount of data available */
- length = 0;
- if(PeekNamedPipe(handle, NULL, 0, NULL, &length, NULL)) {
- /* if there is no data available, sleep and continue waiting */
- if(length == 0) {
- SleepEx(0, FALSE);
- ReleaseMutex(mutex);
- continue;
- }
- else {
- logmsg("[select_ws_wait_thread] PeekNamedPipe len: %d", length);
- }
- }
- else {
- /* if the pipe has NOT been closed, sleep and continue waiting */
- ret = GetLastError();
- if(ret != ERROR_BROKEN_PIPE) {
- logmsg("[select_ws_wait_thread] PeekNamedPipe error: %d", ret);
- SleepEx(0, FALSE);
- ReleaseMutex(mutex);
- continue;
- }
- else {
- logmsg("[select_ws_wait_thread] pipe closed, PIPE: %p", handle);
- }
- }
- /* there is some data available, stop waiting */
- logmsg("[select_ws_wait_thread] data available, PIPE: %p", handle);
- SetEvent(signal);
- ReleaseMutex(mutex);
- break;
- }
- else if(ret == WAIT_ABANDONED) {
- /* we are not allowed to process this event, because select_ws
- is post-processing the signalled events and we must exit. */
- break;
- }
- }
- break;
- default:
- /* The handle has an unknown type, try to wait on it */
- if(WaitForMultipleObjectsEx(2, handles, FALSE, INFINITE, FALSE)
- == WAIT_OBJECT_0 + 1) {
- if(WaitForSingleObjectEx(mutex, 0, FALSE) == WAIT_OBJECT_0) {
- logmsg("[select_ws_wait_thread] data available, HANDLE: %p", handle);
- SetEvent(signal);
- ReleaseMutex(mutex);
- }
- }
- break;
- }
- return 0;
- }
- static HANDLE select_ws_wait(HANDLE handle, HANDLE signal,
- HANDLE abort, HANDLE mutex)
- {
- struct select_ws_wait_data *data;
- HANDLE thread = NULL;
- /* allocate internal waiting data structure */
- data = malloc(sizeof(struct select_ws_wait_data));
- if(data) {
- data->handle = handle;
- data->signal = signal;
- data->abort = abort;
- data->mutex = mutex;
- /* launch waiting thread */
- thread = CreateThread(NULL, 0,
- &select_ws_wait_thread,
- data, 0, NULL);
- /* free data if thread failed to launch */
- if(!thread) {
- free(data);
- }
- }
- return thread;
- }
- struct select_ws_data {
- int fd; /* provided file descriptor (indexed by nfd) */
- long wsastate; /* internal pre-select state (indexed by nfd) */
- curl_socket_t wsasock; /* internal socket handle (indexed by nws) */
- WSAEVENT wsaevent; /* internal select event (indexed by nws) */
- HANDLE signal; /* internal thread signal (indexed by nth) */
- HANDLE thread; /* internal thread handle (indexed by nth) */
- };
- static int select_ws(int nfds, fd_set *readfds, fd_set *writefds,
- fd_set *exceptfds, struct timeval *tv)
- {
- HANDLE abort, mutex, signal, handle, *handles;
- DWORD timeout_ms, wait, nfd, nth, nws, i;
- fd_set readsock, writesock, exceptsock;
- struct select_ws_data *data;
- WSANETWORKEVENTS wsaevents;
- curl_socket_t wsasock;
- int error, ret, fd;
- WSAEVENT wsaevent;
- /* check if the input value is valid */
- if(nfds < 0) {
- errno = EINVAL;
- return -1;
- }
- /* convert struct timeval to milliseconds */
- if(tv) {
- timeout_ms = (tv->tv_sec*1000) + (DWORD)(((double)tv->tv_usec)/1000.0);
- }
- else {
- timeout_ms = INFINITE;
- }
- /* check if we got descriptors, sleep in case we got none */
- if(!nfds) {
- SleepEx(timeout_ms, FALSE);
- return 0;
- }
- /* create internal event to abort waiting threads */
- abort = CreateEvent(NULL, TRUE, FALSE, NULL);
- if(!abort) {
- errno = ENOMEM;
- return -1;
- }
- /* create internal mutex to lock event handling in threads */
- mutex = CreateMutex(NULL, FALSE, NULL);
- if(!mutex) {
- CloseHandle(abort);
- errno = ENOMEM;
- return -1;
- }
- /* allocate internal array for the internal data */
- data = calloc(nfds, sizeof(struct select_ws_data));
- if(data == NULL) {
- CloseHandle(abort);
- CloseHandle(mutex);
- errno = ENOMEM;
- return -1;
- }
- /* allocate internal array for the internal event handles */
- handles = calloc(nfds + 1, sizeof(HANDLE));
- if(handles == NULL) {
- CloseHandle(abort);
- CloseHandle(mutex);
- free(data);
- errno = ENOMEM;
- return -1;
- }
- /* loop over the handles in the input descriptor sets */
- nfd = 0; /* number of handled file descriptors */
- nth = 0; /* number of internal waiting threads */
- nws = 0; /* number of handled WINSOCK sockets */
- for(fd = 0; fd < nfds; fd++) {
- wsasock = curlx_sitosk(fd);
- wsaevents.lNetworkEvents = 0;
- handles[nfd] = 0;
- FD_ZERO(&readsock);
- FD_ZERO(&writesock);
- FD_ZERO(&exceptsock);
- if(FD_ISSET(wsasock, readfds)) {
- FD_SET(wsasock, &readsock);
- wsaevents.lNetworkEvents |= FD_READ|FD_ACCEPT|FD_CLOSE;
- }
- if(FD_ISSET(wsasock, writefds)) {
- FD_SET(wsasock, &writesock);
- wsaevents.lNetworkEvents |= FD_WRITE|FD_CONNECT|FD_CLOSE;
- }
- if(FD_ISSET(wsasock, exceptfds)) {
- FD_SET(wsasock, &exceptsock);
- wsaevents.lNetworkEvents |= FD_OOB;
- }
- /* only wait for events for which we actually care */
- if(wsaevents.lNetworkEvents) {
- data[nfd].fd = fd;
- if(fd == fileno(stdin)) {
- signal = CreateEvent(NULL, TRUE, FALSE, NULL);
- if(signal) {
- handle = GetStdHandle(STD_INPUT_HANDLE);
- handle = select_ws_wait(handle, signal, abort, mutex);
- if(handle) {
- handles[nfd] = signal;
- data[nth].signal = signal;
- data[nth].thread = handle;
- nth++;
- }
- else {
- CloseHandle(signal);
- }
- }
- }
- else if(fd == fileno(stdout)) {
- handles[nfd] = GetStdHandle(STD_OUTPUT_HANDLE);
- }
- else if(fd == fileno(stderr)) {
- handles[nfd] = GetStdHandle(STD_ERROR_HANDLE);
- }
- else {
- wsaevent = WSACreateEvent();
- if(wsaevent != WSA_INVALID_EVENT) {
- error = WSAEventSelect(wsasock, wsaevent, wsaevents.lNetworkEvents);
- if(error != SOCKET_ERROR) {
- handles[nfd] = (HANDLE)wsaevent;
- data[nws].wsasock = wsasock;
- data[nws].wsaevent = wsaevent;
- data[nfd].wsastate = 0;
- tv->tv_sec = 0;
- tv->tv_usec = 0;
- /* check if the socket is already ready */
- if(select(fd + 1, &readsock, &writesock, &exceptsock, tv) == 1) {
- logmsg("[select_ws] socket %d is ready", fd);
- WSASetEvent(wsaevent);
- if(FD_ISSET(wsasock, &readsock))
- data[nfd].wsastate |= FD_READ;
- if(FD_ISSET(wsasock, &writesock))
- data[nfd].wsastate |= FD_WRITE;
- if(FD_ISSET(wsasock, &exceptsock))
- data[nfd].wsastate |= FD_OOB;
- }
- nws++;
- }
- else {
- WSACloseEvent(wsaevent);
- signal = CreateEvent(NULL, TRUE, FALSE, NULL);
- if(signal) {
- handle = (HANDLE)wsasock;
- handle = select_ws_wait(handle, signal, abort, mutex);
- if(handle) {
- handles[nfd] = signal;
- data[nth].signal = signal;
- data[nth].thread = handle;
- nth++;
- }
- else {
- CloseHandle(signal);
- }
- }
- }
- }
- }
- nfd++;
- }
- }
- /* wait on the number of handles */
- wait = nfd;
- /* make sure we stop waiting on exit signal event */
- if(exit_event) {
- /* we allocated handles nfds + 1 for this */
- handles[nfd] = exit_event;
- wait += 1;
- }
- /* wait for one of the internal handles to trigger */
- wait = WaitForMultipleObjectsEx(wait, handles, FALSE, timeout_ms, FALSE);
- /* wait for internal mutex to lock event handling in threads */
- WaitForSingleObjectEx(mutex, INFINITE, FALSE);
- /* loop over the internal handles returned in the descriptors */
- ret = 0; /* number of ready file descriptors */
- for(i = 0; i < nfd; i++) {
- fd = data[i].fd;
- handle = handles[i];
- wsasock = curlx_sitosk(fd);
- /* check if the current internal handle was triggered */
- if(wait != WAIT_FAILED && (wait - WAIT_OBJECT_0) <= i &&
- WaitForSingleObjectEx(handle, 0, FALSE) == WAIT_OBJECT_0) {
- /* first handle stdin, stdout and stderr */
- if(fd == fileno(stdin)) {
- /* stdin is never ready for write or exceptional */
- FD_CLR(wsasock, writefds);
- FD_CLR(wsasock, exceptfds);
- }
- else if(fd == fileno(stdout) || fd == fileno(stderr)) {
- /* stdout and stderr are never ready for read or exceptional */
- FD_CLR(wsasock, readfds);
- FD_CLR(wsasock, exceptfds);
- }
- else {
- /* try to handle the event with the WINSOCK2 functions */
- wsaevents.lNetworkEvents = 0;
- error = WSAEnumNetworkEvents(wsasock, handle, &wsaevents);
- if(error != SOCKET_ERROR) {
- /* merge result from pre-check using select */
- wsaevents.lNetworkEvents |= data[i].wsastate;
- /* remove from descriptor set if not ready for read/accept/close */
- if(!(wsaevents.lNetworkEvents & (FD_READ|FD_ACCEPT|FD_CLOSE)))
- FD_CLR(wsasock, readfds);
- /* remove from descriptor set if not ready for write/connect */
- if(!(wsaevents.lNetworkEvents & (FD_WRITE|FD_CONNECT|FD_CLOSE)))
- FD_CLR(wsasock, writefds);
- /* remove from descriptor set if not exceptional */
- if(!(wsaevents.lNetworkEvents & FD_OOB))
- FD_CLR(wsasock, exceptfds);
- }
- }
- /* check if the event has not been filtered using specific tests */
- if(FD_ISSET(wsasock, readfds) || FD_ISSET(wsasock, writefds) ||
- FD_ISSET(wsasock, exceptfds)) {
- ret++;
- }
- }
- else {
- /* remove from all descriptor sets since this handle did not trigger */
- FD_CLR(wsasock, readfds);
- FD_CLR(wsasock, writefds);
- FD_CLR(wsasock, exceptfds);
- }
- }
- /* signal the event handle for the other waiting threads */
- SetEvent(abort);
- for(fd = 0; fd < nfds; fd++) {
- if(FD_ISSET(fd, readfds))
- logmsg("[select_ws] %d is readable", fd);
- if(FD_ISSET(fd, writefds))
- logmsg("[select_ws] %d is writable", fd);
- if(FD_ISSET(fd, exceptfds))
- logmsg("[select_ws] %d is exceptional", fd);
- }
- for(i = 0; i < nws; i++) {
- WSAEventSelect(data[i].wsasock, NULL, 0);
- WSACloseEvent(data[i].wsaevent);
- }
- for(i = 0; i < nth; i++) {
- WaitForSingleObjectEx(data[i].thread, INFINITE, FALSE);
- CloseHandle(data[i].thread);
- CloseHandle(data[i].signal);
- }
- CloseHandle(abort);
- CloseHandle(mutex);
- free(handles);
- free(data);
- return ret;
- }
- #define select(a,b,c,d,e) select_ws(a,b,c,d,e)
- #endif /* USE_WINSOCK */
- /*
- sockfdp is a pointer to an established stream or CURL_SOCKET_BAD
- if sockfd is CURL_SOCKET_BAD, listendfd is a listening socket we must
- accept()
- */
- static bool juggle(curl_socket_t *sockfdp,
- curl_socket_t listenfd,
- enum sockmode *mode)
- {
- struct timeval timeout;
- fd_set fds_read;
- fd_set fds_write;
- fd_set fds_err;
- curl_socket_t sockfd = CURL_SOCKET_BAD;
- int maxfd = -99;
- ssize_t rc;
- int error = 0;
- /* 'buffer' is this excessively large only to be able to support things like
- test 1003 which tests exceedingly large server response lines */
- unsigned char buffer[17010];
- char data[16];
- if(got_exit_signal) {
- logmsg("signalled to die, exiting...");
- return FALSE;
- }
- #ifdef HAVE_GETPPID
- /* As a last resort, quit if sockfilt process becomes orphan. Just in case
- parent ftpserver process has died without killing its sockfilt children */
- if(getppid() <= 1) {
- logmsg("process becomes orphan, exiting");
- return FALSE;
- }
- #endif
- timeout.tv_sec = 120;
- timeout.tv_usec = 0;
- FD_ZERO(&fds_read);
- FD_ZERO(&fds_write);
- FD_ZERO(&fds_err);
- FD_SET((curl_socket_t)fileno(stdin), &fds_read);
- switch(*mode) {
- case PASSIVE_LISTEN:
- /* server mode */
- sockfd = listenfd;
- /* there's always a socket to wait for */
- FD_SET(sockfd, &fds_read);
- maxfd = (int)sockfd;
- break;
- case PASSIVE_CONNECT:
- sockfd = *sockfdp;
- if(CURL_SOCKET_BAD == sockfd) {
- /* eeek, we are supposedly connected and then this cannot be -1 ! */
- logmsg("socket is -1! on %s:%d", __FILE__, __LINE__);
- maxfd = 0; /* stdin */
- }
- else {
- /* there's always a socket to wait for */
- FD_SET(sockfd, &fds_read);
- maxfd = (int)sockfd;
- }
- break;
- case ACTIVE:
- sockfd = *sockfdp;
- /* sockfd turns CURL_SOCKET_BAD when our connection has been closed */
- if(CURL_SOCKET_BAD != sockfd) {
- FD_SET(sockfd, &fds_read);
- maxfd = (int)sockfd;
- }
- else {
- logmsg("No socket to read on");
- maxfd = 0;
- }
- break;
- case ACTIVE_DISCONNECT:
- logmsg("disconnected, no socket to read on");
- maxfd = 0;
- sockfd = CURL_SOCKET_BAD;
- break;
- } /* switch(*mode) */
- do {
- /* select() blocking behavior call on blocking descriptors please */
- rc = select(maxfd + 1, &fds_read, &fds_write, &fds_err, &timeout);
- if(got_exit_signal) {
- logmsg("signalled to die, exiting...");
- return FALSE;
- }
- } while((rc == -1) && ((error = errno) == EINTR));
- if(rc < 0) {
- logmsg("select() failed with error: (%d) %s",
- error, strerror(error));
- return FALSE;
- }
- if(rc == 0)
- /* timeout */
- return TRUE;
- if(FD_ISSET(fileno(stdin), &fds_read)) {
- ssize_t buffer_len;
- /* read from stdin, commands/data to be dealt with and possibly passed on
- to the socket
- protocol:
- 4 letter command + LF [mandatory]
- 4-digit hexadecimal data length + LF [if the command takes data]
- data [the data being as long as set above]
- Commands:
- DATA - plain pass-through data
- */
- if(!read_stdin(buffer, 5))
- return FALSE;
- logmsg("Received %c%c%c%c (on stdin)",
- buffer[0], buffer[1], buffer[2], buffer[3]);
- if(!memcmp("PING", buffer, 4)) {
- /* send reply on stdout, just proving we are alive */
- if(!write_stdout("PONG\n", 5))
- return FALSE;
- }
- else if(!memcmp("PORT", buffer, 4)) {
- /* Question asking us what PORT number we are listening to.
- Replies to PORT with "IPv[num]/[port]" */
- msnprintf((char *)buffer, sizeof(buffer), "%s/%hu\n", ipv_inuse, port);
- buffer_len = (ssize_t)strlen((char *)buffer);
- msnprintf(data, sizeof(data), "PORT\n%04zx\n", buffer_len);
- if(!write_stdout(data, 10))
- return FALSE;
- if(!write_stdout(buffer, buffer_len))
- return FALSE;
- }
- else if(!memcmp("QUIT", buffer, 4)) {
- /* just die */
- logmsg("quits");
- return FALSE;
- }
- else if(!memcmp("DATA", buffer, 4)) {
- /* data IN => data OUT */
- if(!read_stdin(buffer, 5))
- return FALSE;
- buffer[5] = '\0';
- buffer_len = (ssize_t)strtol((char *)buffer, NULL, 16);
- if(buffer_len > (ssize_t)sizeof(buffer)) {
- logmsg("ERROR: Buffer size (%zu bytes) too small for data size "
- "(%zd bytes)", sizeof(buffer), buffer_len);
- return FALSE;
- }
- logmsg("> %zd bytes data, server => client", buffer_len);
- if(!read_stdin(buffer, buffer_len))
- return FALSE;
- lograw(buffer, buffer_len);
- if(*mode == PASSIVE_LISTEN) {
- logmsg("*** We are disconnected!");
- if(!write_stdout("DISC\n", 5))
- return FALSE;
- }
- else {
- /* send away on the socket */
- ssize_t bytes_written = swrite(sockfd, buffer, buffer_len);
- if(bytes_written != buffer_len) {
- logmsg("Not all data was sent. Bytes to send: %zd sent: %zd",
- buffer_len, bytes_written);
- }
- }
- }
- else if(!memcmp("DISC", buffer, 4)) {
- /* disconnect! */
- if(!write_stdout("DISC\n", 5))
- return FALSE;
- if(sockfd != CURL_SOCKET_BAD) {
- logmsg("====> Client forcibly disconnected");
- sclose(sockfd);
- *sockfdp = CURL_SOCKET_BAD;
- if(*mode == PASSIVE_CONNECT)
- *mode = PASSIVE_LISTEN;
- else
- *mode = ACTIVE_DISCONNECT;
- }
- else
- logmsg("attempt to close already dead connection");
- return TRUE;
- }
- }
- if((sockfd != CURL_SOCKET_BAD) && (FD_ISSET(sockfd, &fds_read)) ) {
- ssize_t nread_socket;
- if(*mode == PASSIVE_LISTEN) {
- /* there's no stream set up yet, this is an indication that there's a
- client connecting. */
- curl_socket_t newfd = accept(sockfd, NULL, NULL);
- if(CURL_SOCKET_BAD == newfd) {
- error = SOCKERRNO;
- logmsg("accept(%d, NULL, NULL) failed with error: (%d) %s",
- sockfd, error, strerror(error));
- }
- else {
- logmsg("====> Client connect");
- if(!write_stdout("CNCT\n", 5))
- return FALSE;
- *sockfdp = newfd; /* store the new socket */
- *mode = PASSIVE_CONNECT; /* we have connected */
- }
- return TRUE;
- }
- /* read from socket, pass on data to stdout */
- nread_socket = sread(sockfd, buffer, sizeof(buffer));
- if(nread_socket > 0) {
- msnprintf(data, sizeof(data), "DATA\n%04zx\n", nread_socket);
- if(!write_stdout(data, 10))
- return FALSE;
- if(!write_stdout(buffer, nread_socket))
- return FALSE;
- logmsg("< %zd bytes data, client => server", nread_socket);
- lograw(buffer, nread_socket);
- }
- if(nread_socket <= 0) {
- logmsg("====> Client disconnect");
- if(!write_stdout("DISC\n", 5))
- return FALSE;
- sclose(sockfd);
- *sockfdp = CURL_SOCKET_BAD;
- if(*mode == PASSIVE_CONNECT)
- *mode = PASSIVE_LISTEN;
- else
- *mode = ACTIVE_DISCONNECT;
- return TRUE;
- }
- }
- return TRUE;
- }
- static curl_socket_t sockdaemon(curl_socket_t sock,
- unsigned short *listenport)
- {
- /* passive daemon style */
- srvr_sockaddr_union_t listener;
- int flag;
- int rc;
- int totdelay = 0;
- int maxretr = 10;
- int delay = 20;
- int attempt = 0;
- int error = 0;
- do {
- attempt++;
- flag = 1;
- rc = setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
- (void *)&flag, sizeof(flag));
- if(rc) {
- error = SOCKERRNO;
- logmsg("setsockopt(SO_REUSEADDR) failed with error: (%d) %s",
- error, strerror(error));
- if(maxretr) {
- rc = wait_ms(delay);
- if(rc) {
- /* should not happen */
- error = errno;
- logmsg("wait_ms() failed with error: (%d) %s",
- error, strerror(error));
- sclose(sock);
- return CURL_SOCKET_BAD;
- }
- if(got_exit_signal) {
- logmsg("signalled to die, exiting...");
- sclose(sock);
- return CURL_SOCKET_BAD;
- }
- totdelay += delay;
- delay *= 2; /* double the sleep for next attempt */
- }
- }
- } while(rc && maxretr--);
- if(rc) {
- logmsg("setsockopt(SO_REUSEADDR) failed %d times in %d ms. Error: (%d) %s",
- attempt, totdelay, error, strerror(error));
- logmsg("Continuing anyway...");
- }
- /* When the specified listener port is zero, it is actually a
- request to let the system choose a non-zero available port. */
- #ifdef ENABLE_IPV6
- if(!use_ipv6) {
- #endif
- memset(&listener.sa4, 0, sizeof(listener.sa4));
- listener.sa4.sin_family = AF_INET;
- listener.sa4.sin_addr.s_addr = INADDR_ANY;
- listener.sa4.sin_port = htons(*listenport);
- rc = bind(sock, &listener.sa, sizeof(listener.sa4));
- #ifdef ENABLE_IPV6
- }
- else {
- memset(&listener.sa6, 0, sizeof(listener.sa6));
- listener.sa6.sin6_family = AF_INET6;
- listener.sa6.sin6_addr = in6addr_any;
- listener.sa6.sin6_port = htons(*listenport);
- rc = bind(sock, &listener.sa, sizeof(listener.sa6));
- }
- #endif /* ENABLE_IPV6 */
- if(rc) {
- error = SOCKERRNO;
- logmsg("Error binding socket on port %hu: (%d) %s",
- *listenport, error, strerror(error));
- sclose(sock);
- return CURL_SOCKET_BAD;
- }
- if(!*listenport) {
- /* The system was supposed to choose a port number, figure out which
- port we actually got and update the listener port value with it. */
- curl_socklen_t la_size;
- srvr_sockaddr_union_t localaddr;
- #ifdef ENABLE_IPV6
- if(!use_ipv6)
- #endif
- la_size = sizeof(localaddr.sa4);
- #ifdef ENABLE_IPV6
- else
- la_size = sizeof(localaddr.sa6);
- #endif
- memset(&localaddr.sa, 0, (size_t)la_size);
- if(getsockname(sock, &localaddr.sa, &la_size) < 0) {
- error = SOCKERRNO;
- logmsg("getsockname() failed with error: (%d) %s",
- error, strerror(error));
- sclose(sock);
- return CURL_SOCKET_BAD;
- }
- switch(localaddr.sa.sa_family) {
- case AF_INET:
- *listenport = ntohs(localaddr.sa4.sin_port);
- break;
- #ifdef ENABLE_IPV6
- case AF_INET6:
- *listenport = ntohs(localaddr.sa6.sin6_port);
- break;
- #endif
- default:
- break;
- }
- if(!*listenport) {
- /* Real failure, listener port shall not be zero beyond this point. */
- logmsg("Apparently getsockname() succeeded, with listener port zero.");
- logmsg("A valid reason for this failure is a binary built without");
- logmsg("proper network library linkage. This might not be the only");
- logmsg("reason, but double check it before anything else.");
- sclose(sock);
- return CURL_SOCKET_BAD;
- }
- }
- /* bindonly option forces no listening */
- if(bind_only) {
- logmsg("instructed to bind port without listening");
- return sock;
- }
- /* start accepting connections */
- rc = listen(sock, 5);
- if(0 != rc) {
- error = SOCKERRNO;
- logmsg("listen(%d, 5) failed with error: (%d) %s",
- sock, error, strerror(error));
- sclose(sock);
- return CURL_SOCKET_BAD;
- }
- return sock;
- }
- int main(int argc, char *argv[])
- {
- srvr_sockaddr_union_t me;
- curl_socket_t sock = CURL_SOCKET_BAD;
- curl_socket_t msgsock = CURL_SOCKET_BAD;
- int wrotepidfile = 0;
- const char *pidname = ".sockfilt.pid";
- const char *portfile = NULL; /* none by default */
- bool juggle_again;
- int rc;
- int error;
- int arg = 1;
- enum sockmode mode = PASSIVE_LISTEN; /* default */
- const char *addr = NULL;
- while(argc>arg) {
- if(!strcmp("--version", argv[arg])) {
- printf("sockfilt IPv4%s\n",
- #ifdef ENABLE_IPV6
- "/IPv6"
- #else
- ""
- #endif
- );
- return 0;
- }
- else if(!strcmp("--verbose", argv[arg])) {
- verbose = TRUE;
- arg++;
- }
- else if(!strcmp("--pidfile", argv[arg])) {
- arg++;
- if(argc>arg)
- pidname = argv[arg++];
- }
- else if(!strcmp("--portfile", argv[arg])) {
- arg++;
- if(argc > arg)
- portfile = argv[arg++];
- }
- else if(!strcmp("--logfile", argv[arg])) {
- arg++;
- if(argc>arg)
- serverlogfile = argv[arg++];
- }
- else if(!strcmp("--ipv6", argv[arg])) {
- #ifdef ENABLE_IPV6
- ipv_inuse = "IPv6";
- use_ipv6 = TRUE;
- #endif
- arg++;
- }
- else if(!strcmp("--ipv4", argv[arg])) {
- /* for completeness, we support this option as well */
- #ifdef ENABLE_IPV6
- ipv_inuse = "IPv4";
- use_ipv6 = FALSE;
- #endif
- arg++;
- }
- else if(!strcmp("--bindonly", argv[arg])) {
- bind_only = TRUE;
- arg++;
- }
- else if(!strcmp("--port", argv[arg])) {
- arg++;
- if(argc>arg) {
- char *endptr;
- unsigned long ulnum = strtoul(argv[arg], &endptr, 10);
- port = curlx_ultous(ulnum);
- arg++;
- }
- }
- else if(!strcmp("--connect", argv[arg])) {
- /* Asked to actively connect to the specified local port instead of
- doing a passive server-style listening. */
- arg++;
- if(argc>arg) {
- char *endptr;
- unsigned long ulnum = strtoul(argv[arg], &endptr, 10);
- if((endptr != argv[arg] + strlen(argv[arg])) ||
- (ulnum < 1025UL) || (ulnum > 65535UL)) {
- fprintf(stderr, "sockfilt: invalid --connect argument (%s)\n",
- argv[arg]);
- return 0;
- }
- connectport = curlx_ultous(ulnum);
- arg++;
- }
- }
- else if(!strcmp("--addr", argv[arg])) {
- /* Set an IP address to use with --connect; otherwise use localhost */
- arg++;
- if(argc>arg) {
- addr = argv[arg];
- arg++;
- }
- }
- else {
- puts("Usage: sockfilt [option]\n"
- " --version\n"
- " --verbose\n"
- " --logfile [file]\n"
- " --pidfile [file]\n"
- " --ipv4\n"
- " --ipv6\n"
- " --bindonly\n"
- " --port [port]\n"
- " --connect [port]\n"
- " --addr [address]");
- return 0;
- }
- }
- #ifdef WIN32
- win32_init();
- atexit(win32_cleanup);
- setmode(fileno(stdin), O_BINARY);
- setmode(fileno(stdout), O_BINARY);
- setmode(fileno(stderr), O_BINARY);
- #endif
- install_signal_handlers(false);
- #ifdef ENABLE_IPV6
- if(!use_ipv6)
- #endif
- sock = socket(AF_INET, SOCK_STREAM, 0);
- #ifdef ENABLE_IPV6
- else
- sock = socket(AF_INET6, SOCK_STREAM, 0);
- #endif
- if(CURL_SOCKET_BAD == sock) {
- error = SOCKERRNO;
- logmsg("Error creating socket: (%d) %s",
- error, strerror(error));
- write_stdout("FAIL\n", 5);
- goto sockfilt_cleanup;
- }
- if(connectport) {
- /* Active mode, we should connect to the given port number */
- mode = ACTIVE;
- #ifdef ENABLE_IPV6
- if(!use_ipv6) {
- #endif
- memset(&me.sa4, 0, sizeof(me.sa4));
- me.sa4.sin_family = AF_INET;
- me.sa4.sin_port = htons(connectport);
- me.sa4.sin_addr.s_addr = INADDR_ANY;
- if(!addr)
- addr = "127.0.0.1";
- Curl_inet_pton(AF_INET, addr, &me.sa4.sin_addr);
- rc = connect(sock, &me.sa, sizeof(me.sa4));
- #ifdef ENABLE_IPV6
- }
- else {
- memset(&me.sa6, 0, sizeof(me.sa6));
- me.sa6.sin6_family = AF_INET6;
- me.sa6.sin6_port = htons(connectport);
- if(!addr)
- addr = "::1";
- Curl_inet_pton(AF_INET6, addr, &me.sa6.sin6_addr);
- rc = connect(sock, &me.sa, sizeof(me.sa6));
- }
- #endif /* ENABLE_IPV6 */
- if(rc) {
- error = SOCKERRNO;
- logmsg("Error connecting to port %hu: (%d) %s",
- connectport, error, strerror(error));
- write_stdout("FAIL\n", 5);
- goto sockfilt_cleanup;
- }
- logmsg("====> Client connect");
- msgsock = sock; /* use this as stream */
- }
- else {
- /* passive daemon style */
- sock = sockdaemon(sock, &port);
- if(CURL_SOCKET_BAD == sock) {
- write_stdout("FAIL\n", 5);
- goto sockfilt_cleanup;
- }
- msgsock = CURL_SOCKET_BAD; /* no stream socket yet */
- }
- logmsg("Running %s version", ipv_inuse);
- if(connectport)
- logmsg("Connected to port %hu", connectport);
- else if(bind_only)
- logmsg("Bound without listening on port %hu", port);
- else
- logmsg("Listening on port %hu", port);
- wrotepidfile = write_pidfile(pidname);
- if(!wrotepidfile) {
- write_stdout("FAIL\n", 5);
- goto sockfilt_cleanup;
- }
- if(portfile) {
- wrotepidfile = write_portfile(portfile, port);
- if(!wrotepidfile) {
- write_stdout("FAIL\n", 5);
- goto sockfilt_cleanup;
- }
- }
- do {
- juggle_again = juggle(&msgsock, sock, &mode);
- } while(juggle_again);
- sockfilt_cleanup:
- if((msgsock != sock) && (msgsock != CURL_SOCKET_BAD))
- sclose(msgsock);
- if(sock != CURL_SOCKET_BAD)
- sclose(sock);
- if(wrotepidfile)
- unlink(pidname);
- restore_signal_handlers(false);
- if(got_exit_signal) {
- logmsg("============> sockfilt exits with signal (%d)", exit_signal);
- /*
- * To properly set the return status of the process we
- * must raise the same signal SIGINT or SIGTERM that we
- * caught and let the old handler take care of it.
- */
- raise(exit_signal);
- }
- logmsg("============> sockfilt quits");
- return 0;
- }
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