| /*************************************************************************** |
| * _ _ ____ _ |
| * Project ___| | | | _ \| | |
| * / __| | | | |_) | | |
| * | (__| |_| | _ <| |___ |
| * \___|\___/|_| \_\_____| |
| * |
| * Copyright (C) 1998 - 2011, 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 http://curl.haxx.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. |
| * |
| ***************************************************************************/ |
| |
| /* 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 worthwile 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! |
| */ |
| |
| #define CURL_NO_OLDIES |
| |
| #include "setup.h" /* portability help from the lib directory */ |
| |
| #ifdef HAVE_SIGNAL_H |
| #include <signal.h> |
| #endif |
| #ifdef HAVE_UNISTD_H |
| #include <unistd.h> |
| #endif |
| #ifdef HAVE_SYS_SOCKET_H |
| #include <sys/socket.h> |
| #endif |
| #ifdef HAVE_NETINET_IN_H |
| #include <netinet/in.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 memdebug.h last */ |
| #include "memdebug.h" |
| |
| #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 */ |
| }; |
| |
| /* do-nothing macro replacement for systems which lack siginterrupt() */ |
| |
| #ifndef HAVE_SIGINTERRUPT |
| #define siginterrupt(x,y) do {} while(0) |
| #endif |
| |
| /* vars used to keep around previous signal handlers */ |
| |
| typedef RETSIGTYPE (*SIGHANDLER_T)(int); |
| |
| #ifdef SIGHUP |
| static SIGHANDLER_T old_sighup_handler = SIG_ERR; |
| #endif |
| |
| #ifdef SIGPIPE |
| static SIGHANDLER_T old_sigpipe_handler = SIG_ERR; |
| #endif |
| |
| #ifdef SIGALRM |
| static SIGHANDLER_T old_sigalrm_handler = SIG_ERR; |
| #endif |
| |
| #ifdef SIGINT |
| static SIGHANDLER_T old_sigint_handler = SIG_ERR; |
| #endif |
| |
| #ifdef SIGTERM |
| static SIGHANDLER_T old_sigterm_handler = SIG_ERR; |
| #endif |
| |
| /* var which if set indicates that the program should finish execution */ |
| |
| SIG_ATOMIC_T got_exit_signal = 0; |
| |
| /* if next is set indicates the first signal handled in exit_signal_handler */ |
| |
| static volatile int exit_signal = 0; |
| |
| /* signal handler that will be triggered to indicate that the program |
| should finish its execution in a controlled manner as soon as possible. |
| The first time this is called it will set got_exit_signal to one and |
| store in exit_signal the signal that triggered its execution. */ |
| |
| static RETSIGTYPE exit_signal_handler(int signum) |
| { |
| int old_errno = ERRNO; |
| if(got_exit_signal == 0) { |
| got_exit_signal = 1; |
| exit_signal = signum; |
| } |
| (void)signal(signum, exit_signal_handler); |
| SET_ERRNO(old_errno); |
| } |
| |
| static void install_signal_handlers(void) |
| { |
| #ifdef SIGHUP |
| /* ignore SIGHUP signal */ |
| if((old_sighup_handler = signal(SIGHUP, SIG_IGN)) == SIG_ERR) |
| logmsg("cannot install SIGHUP handler: %s", strerror(ERRNO)); |
| #endif |
| #ifdef SIGPIPE |
| /* ignore SIGPIPE signal */ |
| if((old_sigpipe_handler = signal(SIGPIPE, SIG_IGN)) == SIG_ERR) |
| logmsg("cannot install SIGPIPE handler: %s", strerror(ERRNO)); |
| #endif |
| #ifdef SIGALRM |
| /* ignore SIGALRM signal */ |
| if((old_sigalrm_handler = signal(SIGALRM, SIG_IGN)) == SIG_ERR) |
| logmsg("cannot install SIGALRM handler: %s", strerror(ERRNO)); |
| #endif |
| #ifdef SIGINT |
| /* handle SIGINT signal with our exit_signal_handler */ |
| if((old_sigint_handler = signal(SIGINT, exit_signal_handler)) == SIG_ERR) |
| logmsg("cannot install SIGINT handler: %s", strerror(ERRNO)); |
| else |
| siginterrupt(SIGINT, 1); |
| #endif |
| #ifdef SIGTERM |
| /* handle SIGTERM signal with our exit_signal_handler */ |
| if((old_sigterm_handler = signal(SIGTERM, exit_signal_handler)) == SIG_ERR) |
| logmsg("cannot install SIGTERM handler: %s", strerror(ERRNO)); |
| else |
| siginterrupt(SIGTERM, 1); |
| #endif |
| } |
| |
| static void restore_signal_handlers(void) |
| { |
| #ifdef SIGHUP |
| if(SIG_ERR != old_sighup_handler) |
| (void)signal(SIGHUP, old_sighup_handler); |
| #endif |
| #ifdef SIGPIPE |
| if(SIG_ERR != old_sigpipe_handler) |
| (void)signal(SIGPIPE, old_sigpipe_handler); |
| #endif |
| #ifdef SIGALRM |
| if(SIG_ERR != old_sigalrm_handler) |
| (void)signal(SIGALRM, old_sigalrm_handler); |
| #endif |
| #ifdef SIGINT |
| if(SIG_ERR != old_sigint_handler) |
| (void)signal(SIGINT, old_sigint_handler); |
| #endif |
| #ifdef SIGTERM |
| if(SIG_ERR != old_sigterm_handler) |
| (void)signal(SIGTERM, old_sigterm_handler); |
| #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 rc; |
| ssize_t nread = 0; |
| |
| do { |
| 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("unrecoverable read() failure: %s", 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 wc; |
| ssize_t nwrite = 0; |
| |
| do { |
| wc = write(filedes, (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("unrecoverable write() failure: %s", 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; |
| |
| for(i=0; i<len; i++) { |
| switch(ptr[i]) { |
| case '\n': |
| sprintf(optr, "\\n"); |
| width += 2; |
| optr += 2; |
| break; |
| case '\r': |
| sprintf(optr, "\\r"); |
| width += 2; |
| optr += 2; |
| break; |
| default: |
| sprintf(optr, "%c", (ISGRAPH(ptr[i]) || ptr[i]==0x20) ?ptr[i]:'.'); |
| width++; |
| optr++; |
| break; |
| } |
| |
| if(width>60) { |
| logmsg("'%s'", data); |
| width = 0; |
| optr = data; |
| } |
| } |
| if(width) |
| logmsg("'%s'", data); |
| } |
| |
| /* |
| 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; |
| curl_socket_t maxfd = CURL_SOCKET_BAD; |
| ssize_t rc; |
| ssize_t nread_socket; |
| ssize_t bytes_written; |
| ssize_t buffer_len; |
| 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); |
| |
| #ifdef USE_WINSOCK |
| /* |
| ** WinSock select() does not support standard file descriptors, |
| ** it can only check SOCKETs. Since this program in its current |
| ** state will not work on WinSock based systems, next line is |
| ** commented out to allow warning-free compilation awaiting the |
| ** day it will be fixed to also run on WinSock systems. |
| */ |
| #else |
| FD_SET(fileno(stdin), &fds_read); |
| #endif |
| |
| switch(*mode) { |
| |
| case PASSIVE_LISTEN: |
| |
| /* server mode */ |
| sockfd = listenfd; |
| /* there's always a socket to wait for */ |
| FD_SET(sockfd, &fds_read); |
| maxfd = 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 = 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 = 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 { |
| |
| rc = select((int)maxfd + 1, &fds_read, &fds_write, &fds_err, &timeout); |
| |
| if(got_exit_signal) { |
| logmsg("signalled to die, exiting..."); |
| return FALSE; |
| } |
| |
| } while((rc == -1) && ((error = SOCKERRNO) == 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)) { |
| /* 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-thru 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]" */ |
| sprintf((char *)buffer, "%s/%hu\n", ipv_inuse, port); |
| buffer_len = (ssize_t)strlen((char *)buffer); |
| snprintf(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 */ |
| 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)) ) { |
| |
| if(*mode == PASSIVE_LISTEN) { |
| /* there's no stream set up yet, this is an indication that there's a |
| client connecting. */ |
| sockfd = accept(sockfd, NULL, NULL); |
| if(CURL_SOCKET_BAD == sockfd) |
| logmsg("accept() failed"); |
| else { |
| logmsg("====> Client connect"); |
| if(!write_stdout("CNCT\n", 5)) |
| return FALSE; |
| *sockfdp = sockfd; /* 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) { |
| 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; |
| } |
| |
| snprintf(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); |
| } |
| |
| 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 = SOCKERRNO; |
| 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() failed with error: (%d) %s", |
| 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; |
| char *pidname= (char *)".sockfilt.pid"; |
| 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("--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); |
| if((endptr != argv[arg] + strlen(argv[arg])) || |
| ((ulnum != 0UL) && ((ulnum < 1025UL) || (ulnum > 65535UL)))) { |
| fprintf(stderr, "sockfilt: invalid --port argument (%s)\n", |
| argv[arg]); |
| return 0; |
| } |
| 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); |
| #endif |
| |
| install_signal_handlers(); |
| |
| #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; |
| } |
| |
| 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(); |
| |
| 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; |
| } |
| |