| /*************************************************************************** |
| * _ _ ____ _ |
| * Project ___| | | | _ \| | |
| * / __| | | | |_) | | |
| * | (__| |_| | _ <| |___ |
| * \___|\___/|_| \_\_____| |
| * |
| * Copyright (C) 1998 - 2022, 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. |
| * |
| * SPDX-License-Identifier: curl |
| * |
| ***************************************************************************/ |
| #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 "timediff.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 threads */ |
| }; |
| #ifdef _WIN32_WCE |
| static DWORD WINAPI select_ws_wait_thread(LPVOID lpParameter) |
| #else |
| #include <process.h> |
| static unsigned int WINAPI select_ws_wait_thread(void *lpParameter) |
| #endif |
| { |
| struct select_ws_wait_data *data; |
| HANDLE 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; |
| 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) { |
| /* 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); |
| continue; |
| } |
| } |
| } |
| /* there is some data available, stop waiting */ |
| logmsg("[select_ws_wait_thread] data available, DISK: %p", handle); |
| SetEvent(signal); |
| } |
| 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) { |
| /* 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); |
| continue; |
| } |
| } |
| } |
| /* there is some data available, stop waiting */ |
| logmsg("[select_ws_wait_thread] data available, CHAR: %p", handle); |
| SetEvent(signal); |
| } |
| 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) { |
| /* 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); |
| 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); |
| 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); |
| } |
| break; |
| |
| default: |
| /* The handle has an unknown type, try to wait on it */ |
| if(WaitForMultipleObjectsEx(2, handles, FALSE, INFINITE, FALSE) |
| == WAIT_OBJECT_0 + 1) { |
| logmsg("[select_ws_wait_thread] data available, HANDLE: %p", handle); |
| SetEvent(signal); |
| } |
| break; |
| } |
| |
| return 0; |
| } |
| static HANDLE select_ws_wait(HANDLE handle, HANDLE signal, HANDLE abort) |
| { |
| #ifdef _WIN32_WCE |
| typedef HANDLE curl_win_thread_handle_t; |
| #elif defined(__MINGW32__) && !defined(__MINGW64_VERSION_MAJOR) |
| typedef unsigned long curl_win_thread_handle_t; |
| #else |
| typedef uintptr_t curl_win_thread_handle_t; |
| #endif |
| struct select_ws_wait_data *data; |
| curl_win_thread_handle_t thread; |
| |
| /* allocate internal waiting data structure */ |
| data = malloc(sizeof(struct select_ws_wait_data)); |
| if(data) { |
| data->handle = handle; |
| data->signal = signal; |
| data->abort = abort; |
| |
| /* launch waiting thread */ |
| #ifdef _WIN32_WCE |
| thread = CreateThread(NULL, 0, &select_ws_wait_thread, data, 0, NULL); |
| #else |
| thread = _beginthreadex(NULL, 0, &select_ws_wait_thread, data, 0, NULL); |
| #endif |
| |
| /* free data if thread failed to launch */ |
| if(!thread) { |
| free(data); |
| } |
| return (HANDLE)thread; |
| } |
| return NULL; |
| } |
| 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) |
| { |
| DWORD timeout_ms, wait, nfd, nth, nws, i; |
| HANDLE abort, signal, handle, *handles; |
| 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 = (DWORD)curlx_tvtoms(tv); |
| } |
| 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; |
| } |
| |
| /* allocate internal array for the internal data */ |
| data = calloc(nfds, sizeof(struct select_ws_data)); |
| if(!data) { |
| CloseHandle(abort); |
| errno = ENOMEM; |
| return -1; |
| } |
| |
| /* allocate internal array for the internal event handles */ |
| handles = calloc(nfds + 1, sizeof(HANDLE)); |
| if(!handles) { |
| CloseHandle(abort); |
| 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); |
| if(handle) { |
| handles[nfd] = signal; |
| data[nth].signal = signal; |
| data[nth].thread = handle; |
| nfd++; |
| nth++; |
| } |
| else { |
| CloseHandle(signal); |
| } |
| } |
| } |
| else if(fd == fileno(stdout)) { |
| handles[nfd] = GetStdHandle(STD_OUTPUT_HANDLE); |
| nfd++; |
| } |
| else if(fd == fileno(stderr)) { |
| handles[nfd] = GetStdHandle(STD_ERROR_HANDLE); |
| nfd++; |
| } |
| else { |
| wsaevent = WSACreateEvent(); |
| if(wsaevent != WSA_INVALID_EVENT) { |
| if(wsaevents.lNetworkEvents & FD_WRITE) { |
| send(wsasock, NULL, 0, 0); /* reset FD_WRITE */ |
| } |
| 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; |
| } |
| nfd++; |
| nws++; |
| } |
| else { |
| WSACloseEvent(wsaevent); |
| signal = CreateEvent(NULL, TRUE, FALSE, NULL); |
| if(signal) { |
| handle = (HANDLE)wsasock; |
| handle = select_ws_wait(handle, signal, abort); |
| if(handle) { |
| handles[nfd] = signal; |
| data[nth].signal = signal; |
| data[nth].thread = handle; |
| nfd++; |
| nth++; |
| } |
| else { |
| CloseHandle(signal); |
| } |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| /* 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); |
| |
| /* signal the abort event handle and join the other waiting threads */ |
| SetEvent(abort); |
| for(i = 0; i < nth; i++) { |
| WaitForSingleObjectEx(data[i].thread, INFINITE, FALSE); |
| CloseHandle(data[i].thread); |
| } |
| |
| /* 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); |
| } |
| } |
| |
| 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++) { |
| CloseHandle(data[i].signal); |
| } |
| CloseHandle(abort); |
| |
| 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; |
| int wroteportfile = 0; |
| const char *pidname = ".sockfilt.pid"; |
| const char *portname = 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) |
| portname = 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" |
| " --portfile [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(portname) { |
| wroteportfile = write_portfile(portname, port); |
| if(!wroteportfile) { |
| 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); |
| if(wroteportfile) |
| unlink(portname); |
| |
| 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; |
| } |