1 files changed, 0 insertions, 628 deletions

diff --git a/gpxe/src/util/hijack.c b/gpxe/src/util/hijack.c
deleted file mode 100644
index ed89592b..00000000
--- a/gpxe/src/util/hijack.c
+++ /dev/null
@@ -1,628 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <string.h>
-#include <stdarg.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <libgen.h>
-#include <signal.h>
-#include <net/if.h>
-#include <net/ethernet.h>
-#include <sys/select.h>
-#include <sys/socket.h>
-#include <sys/stat.h>
-#include <sys/un.h>
-#include <syslog.h>
-#include <getopt.h>
-#include <pcap.h>
-
-#define SNAPLEN 1600
-
-/*
- * FIXME: is there a way to detect the version of the libpcap library?
- * Version 0.9 has pcap_inject; version 0.8 doesn't, but both report
- * their version number as 2.4.
- */
-#define HAVE_PCAP_INJECT 0
-
-struct hijack {
-	pcap_t *pcap;
-	int fd;
-	int datalink;
-	int filtered;
-	unsigned long rx_count;
-	unsigned long tx_count;
-};
-
-struct hijack_listener {
-	struct sockaddr_un sun;
-	int fd;
-};
-
-struct hijack_options {
-	char interface[IF_NAMESIZE];
-	int daemonise;
-};
-
-static int daemonised = 0;
-
-static int signalled = 0;
-
-static void flag_signalled ( int signal __attribute__ (( unused )) ) {
-	signalled = 1;
-}
-
-#if ! HAVE_PCAP_INJECT
-/**
- * Substitute for pcap_inject(), if this version of libpcap doesn't
- * have it.  Will almost certainly only work under Linux.
- *
- */
-int pcap_inject ( pcap_t *pcap, const void *data, size_t len ) {
-	int fd;
-	char *errbuf = pcap_geterr ( pcap );
-
-	fd = pcap_get_selectable_fd ( pcap );
-	if ( fd < 0 ) {
-		snprintf ( errbuf, PCAP_ERRBUF_SIZE,
-			   "could not get file descriptor" );
-		return -1;
-	}
-	if ( write ( fd, data, len ) != len ) {
-		snprintf ( errbuf, PCAP_ERRBUF_SIZE,
-			   "could not write data: %s", strerror ( errno ) );
-		return -1;
-	}
-	return len;
-}
-#endif /* ! HAVE_PCAP_INJECT */
-
-/**
- * Log error message
- *
- */
-static __attribute__ (( format ( printf, 2, 3 ) )) void
-logmsg ( int level, const char *format, ... ) {
-	va_list ap;
-
-	va_start ( ap, format );
-	if ( daemonised ) {
-		vsyslog ( ( LOG_DAEMON | level ), format, ap );
-	} else {
-		vfprintf ( stderr, format, ap );
-	}
-	va_end ( ap );
-}
-
-/**
- * Open pcap device
- *
- */
-static int hijack_open ( const char *interface, struct hijack *hijack ) {
-	char errbuf[PCAP_ERRBUF_SIZE];
-
-	/* Open interface via pcap */
-	errbuf[0] = '\0';
-	hijack->pcap = pcap_open_live ( interface, SNAPLEN, 1, 0, errbuf );
-	if ( ! hijack->pcap ) {
-		logmsg ( LOG_ERR, "Failed to open %s: %s\n",
-			 interface, errbuf );
-		goto err;
-	}
-	if ( errbuf[0] )
-		logmsg ( LOG_WARNING, "Warning: %s\n", errbuf );
-
-	/* Set capture interface to non-blocking mode */
-	if ( pcap_setnonblock ( hijack->pcap, 1, errbuf ) < 0 ) {
-		logmsg ( LOG_ERR, "Could not make %s non-blocking: %s\n",
-			 interface, errbuf );
-		goto err;
-	}
-
-	/* Get file descriptor for select() */
-	hijack->fd = pcap_get_selectable_fd ( hijack->pcap );
-	if ( hijack->fd < 0 ) {
-		logmsg ( LOG_ERR, "Cannot get selectable file descriptor "
-			 "for %s\n", interface );
-		goto err;
-	}
-
-	/* Get link layer type */
-	hijack->datalink = pcap_datalink ( hijack->pcap );
-
-	return 0;
-
- err:
-	if ( hijack->pcap )
-		pcap_close ( hijack->pcap );
-	return -1;
-}
-
-/**
- * Close pcap device
- *
- */
-static void hijack_close ( struct hijack *hijack ) {
-	pcap_close ( hijack->pcap );
-}
-
-/**
- * Install filter for hijacked connection
- *
- */
-static int hijack_install_filter ( struct hijack *hijack,
-				   char *filter ) {
-	struct bpf_program program;
-
-	/* Compile filter */
-	if ( pcap_compile ( hijack->pcap, &program, filter, 1, 0 ) < 0 ) {
-		logmsg ( LOG_ERR, "could not compile filter \"%s\": %s\n",
-			 filter, pcap_geterr ( hijack->pcap ) );
-		goto err_nofree;
-	}
-
-	/* Install filter */
-	if ( pcap_setfilter ( hijack->pcap, &program ) < 0 ) {
-		logmsg ( LOG_ERR, "could not install filter \"%s\": %s\n",
-			 filter, pcap_geterr ( hijack->pcap ) );
-		goto err;
-	}
-	
-	logmsg ( LOG_INFO, "using filter \"%s\"\n", filter );
-
-	pcap_freecode ( &program );
-	return 0;
-
- err:	
-	pcap_freecode ( &program );
- err_nofree:
-	return -1;
-}
-
-/**
- * Set up filter for hijacked ethernet connection
- *
- */
-static int hijack_filter_ethernet ( struct hijack *hijack, const char *buf,
-				    size_t len ) {
-	char filter[55]; /* see format string */
-	struct ether_header *ether_header = ( struct ether_header * ) buf;
-	unsigned char *hwaddr = ether_header->ether_shost;
-
-	if ( len < sizeof ( *ether_header ) )
-		return -1;
-
-	snprintf ( filter, sizeof ( filter ), "broadcast or multicast or "
-		   "ether host %02x:%02x:%02x:%02x:%02x:%02x", hwaddr[0],
-		   hwaddr[1], hwaddr[2], hwaddr[3], hwaddr[4], hwaddr[5] );
-
-	return hijack_install_filter ( hijack, filter );
-}
-
-/**
- * Set up filter for hijacked connection
- *
- */
-static int hijack_filter ( struct hijack *hijack, const char *buf,
-			   size_t len ) {
-	switch ( hijack->datalink ) {
-	case DLT_EN10MB:
-		return hijack_filter_ethernet ( hijack, buf, len );
-	default:
-		logmsg ( LOG_ERR, "unsupported protocol %s: cannot filter\n",
-			 ( pcap_datalink_val_to_name ( hijack->datalink ) ?
-			   pcap_datalink_val_to_name ( hijack->datalink ) :
-			   "UNKNOWN" ) );
-		/* Return success so we don't get called again */
-		return 0;
-	}
-}
-
-/**
- * Forward data from hijacker
- *
- */
-static ssize_t forward_from_hijacker ( struct hijack *hijack, int fd ) {
-	char buf[SNAPLEN];
-	ssize_t len;
-
-	/* Read packet from hijacker */
-	len = read ( fd, buf, sizeof ( buf ) );
-	if ( len < 0 ) {
-		logmsg ( LOG_ERR, "read from hijacker failed: %s\n",
-			 strerror ( errno ) );
-		return -1;
-	}
-	if ( len == 0 )
-		return 0;
-
-	/* Set up filter if not already in place */
-	if ( ! hijack->filtered ) {
-		if ( hijack_filter ( hijack, buf, len ) == 0 )
-			hijack->filtered = 1;
-	}
-
-	/* Transmit packet to network */
-	if ( pcap_inject ( hijack->pcap, buf, len ) != len ) {
-		logmsg ( LOG_ERR, "write to hijacked port failed: %s\n",
-			 pcap_geterr ( hijack->pcap ) );
-		return -1;
-	}
-
-	hijack->tx_count++;
-	return len;
-};
-
-/**
- * Forward data to hijacker
- *
- */
-static ssize_t forward_to_hijacker ( int fd, struct hijack *hijack ) {
-	struct pcap_pkthdr *pkt_header;
-	const unsigned char *pkt_data;
-	ssize_t len;
-
-	/* Receive packet from network */
-	if ( pcap_next_ex ( hijack->pcap, &pkt_header, &pkt_data ) < 0 ) {
-		logmsg ( LOG_ERR, "read from hijacked port failed: %s\n",
-			 pcap_geterr ( hijack->pcap ) );
-		return -1;
-	}
-	if ( pkt_header->caplen != pkt_header->len ) {
-		logmsg ( LOG_ERR, "read partial packet (%d of %d bytes)\n",
-			 pkt_header->caplen, pkt_header->len );
-		return -1;
-	}
-	if ( pkt_header->caplen == 0 )
-		return 0;
-	len = pkt_header->caplen;
-
-	/* Write packet to hijacker */
-	if ( write ( fd, pkt_data, len ) != len ) {
-		logmsg ( LOG_ERR, "write to hijacker failed: %s\n",
-			 strerror ( errno ) );
-		return -1;
-	}
-
-	hijack->rx_count++;
-	return len;
-};
-
-
-/**
- * Run hijacker
- *
- */
-static int run_hijacker ( const char *interface, int fd ) {
-	struct hijack hijack;
-	fd_set fdset;
-	int max_fd;
-	ssize_t len;
-
-	logmsg ( LOG_INFO, "new connection for %s\n", interface );
-
-	/* Open connection to network */
-	memset ( &hijack, 0, sizeof ( hijack ) );
-	if ( hijack_open ( interface, &hijack ) < 0 )
-		goto err;
-	
-	/* Do the forwarding */
-	max_fd = ( ( fd > hijack.fd ) ? fd : hijack.fd );
-	while ( 1 ) {
-		/* Wait for available data */
-		FD_ZERO ( &fdset );
-		FD_SET ( fd, &fdset );
-		FD_SET ( hijack.fd, &fdset );
-		if ( select ( ( max_fd + 1 ), &fdset, NULL, NULL, 0 ) < 0 ) {
-			logmsg ( LOG_ERR, "select failed: %s\n",
-				 strerror ( errno ) );
-			goto err;
-		}
-		if ( FD_ISSET ( fd, &fdset ) ) {
-			len = forward_from_hijacker ( &hijack, fd );
-			if ( len < 0 )
-				goto err;
-			if ( len == 0 )
-				break;
-		}
-		if ( FD_ISSET ( hijack.fd, &fdset ) ) {
-			len = forward_to_hijacker ( fd, &hijack );
-			if ( len < 0 )
-				goto err;
-			if ( len == 0 )
-				break;
-		}
-	}
-
-	hijack_close ( &hijack );
-	logmsg ( LOG_INFO, "closed connection for %s\n", interface );
-	logmsg ( LOG_INFO, "received %ld packets, sent %ld packets\n",
-		 hijack.rx_count, hijack.tx_count );
-
-	return 0;
-
- err:
-	if ( hijack.pcap )
-		hijack_close ( &hijack );
-	return -1;
-}
-
-/**
- * Open listener socket
- *
- */
-static int open_listener ( const char *interface,
-			   struct hijack_listener *listener ) {
-	
-	/* Create socket */
-	listener->fd = socket ( PF_UNIX, SOCK_SEQPACKET, 0 );
-	if ( listener->fd < 0 ) {
-		logmsg ( LOG_ERR, "Could not create socket: %s\n",
-			 strerror ( errno ) );
-		goto err;
-	}
-
-	/* Bind to local filename */
-	listener->sun.sun_family = AF_UNIX,
-	snprintf ( listener->sun.sun_path, sizeof ( listener->sun.sun_path ),
-		   "/var/run/hijack-%s", interface );
-	if ( bind ( listener->fd, ( struct sockaddr * ) &listener->sun,
-		    sizeof ( listener->sun ) ) < 0 ) {
-		logmsg ( LOG_ERR, "Could not bind socket to %s: %s\n",
-			 listener->sun.sun_path, strerror ( errno ) );
-		goto err;
-	}
-
-	/* Set as a listening socket */
-	if ( listen ( listener->fd, 0 ) < 0 ) {
-		logmsg ( LOG_ERR, "Could not listen to %s: %s\n",
-			 listener->sun.sun_path, strerror ( errno ) );
-		goto err;
-	}
-
-	return 0;
-	
- err:
-	if ( listener->fd >= 0 )
-		close ( listener->fd );
-	return -1;
-}
-
-/**
- * Listen on listener socket
- *
- */
-static int listen_for_hijackers ( struct hijack_listener *listener,
-				  const char *interface ) {
-	int fd;
-	pid_t child;
-	int rc;
-
-	logmsg ( LOG_INFO, "Listening on %s\n", listener->sun.sun_path );
-
-	while ( ! signalled ) {
-		/* Accept new connection, interruptibly */
-		siginterrupt ( SIGINT, 1 );
-		siginterrupt ( SIGHUP, 1 );
-		fd = accept ( listener->fd, NULL, 0 );
-		siginterrupt ( SIGINT, 0 );
-		siginterrupt ( SIGHUP, 0 );
-		if ( fd < 0 ) {
-			if ( errno == EINTR ) {
-				continue;
-			} else {
-				logmsg ( LOG_ERR, "accept failed: %s\n",
-					 strerror ( errno ) );
-				goto err;
-			}
-		}
-
-		/* Fork child process */
-		child = fork();
-		if ( child < 0 ) {
-			logmsg ( LOG_ERR, "fork failed: %s\n",
-				 strerror ( errno ) );
-			goto err;
-		}
-		if ( child == 0 ) {
-			/* I am the child; run the hijacker */
-			rc = run_hijacker ( interface, fd );
-			close ( fd );
-			exit ( rc );
-		}
-		
-		close ( fd );
-	}
-
-	logmsg ( LOG_INFO, "Stopped listening on %s\n",
-		 listener->sun.sun_path );
-	return 0;
-
- err:
-	if ( fd >= 0 )
-		close ( fd );
-	return -1;
-}
-
-/**
- * Close listener socket
- *
- */
-static void close_listener ( struct hijack_listener *listener ) {
-	close ( listener->fd );
-	unlink ( listener->sun.sun_path );
-}
-
-/**
- * Print usage
- *
- */
-static void usage ( char **argv ) {
-	logmsg ( LOG_ERR,
-		 "Usage: %s [options]\n"
-		 "\n"
-		 "Options:\n"
-		 "  -h|--help               Print this help message\n"
-		 "  -i|--interface intf     Use specified network interface\n"
-		 "  -n|--nodaemon           Run in foreground\n",
-		 argv[0] );
-}
-
-/**
- * Parse command-line options
- *
- */
-static int parse_options ( int argc, char **argv,
-			   struct hijack_options *options ) {
-	static struct option long_options[] = {
-		{ "interface", 1, NULL, 'i' },
-		{ "nodaemon", 0, NULL, 'n' },
-		{ "help", 0, NULL, 'h' },
-		{ },
-	};
-	int c;
-
-	/* Set default options */
-	memset ( options, 0, sizeof ( *options ) );
-	strncpy ( options->interface, "eth0", sizeof ( options->interface ) );
-	options->daemonise = 1;
-
-	/* Parse command-line options */
-	while ( 1 ) {
-		int option_index = 0;
-		
-		c = getopt_long ( argc, argv, "i:hn", long_options,
-				  &option_index );
-		if ( c < 0 )
-			break;
-
-		switch ( c ) {
-		case 'i':
-			strncpy ( options->interface, optarg,
-				  sizeof ( options->interface ) );
-			break;
-		case 'n':
-			options->daemonise = 0;
-			break;
-		case 'h':
-			usage( argv );
-			return -1;
-		case '?':
-			/* Unrecognised option */
-			return -1;
-		default:
-			logmsg ( LOG_ERR, "Unrecognised option '-%c'\n", c );
-			return -1;
-		}
-	}
-
-	/* Check there's nothing left over on the command line */
-	if ( optind != argc ) {
-		usage ( argv );
-		return -1;
-	}
-
-	return 0;
-}
-
-/**
- * Daemonise
- *
- */
-static int daemonise ( const char *interface ) {
-	char pidfile[16 + IF_NAMESIZE + 4]; /* "/var/run/hijack-<intf>.pid" */
-	char pid[16];
-	int pidlen;
-	int fd = -1;
-
-	/* Daemonise */
-	if ( daemon ( 0, 0 ) < 0 ) {
-		logmsg ( LOG_ERR, "Could not daemonise: %s\n",
-			 strerror ( errno ) );
-		goto err;
-	}
-	daemonised = 1; /* Direct messages to syslog now */
-
-	/* Open pid file */
-	snprintf ( pidfile, sizeof ( pidfile ), "/var/run/hijack-%s.pid",
-		   interface );
-	fd = open ( pidfile, ( O_WRONLY | O_CREAT | O_TRUNC ),
-		    ( S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH ) );
-	if ( fd < 0 ) {
-		logmsg ( LOG_ERR, "Could not open %s for writing: %s\n",
-			 pidfile, strerror ( errno ) );
-		goto err;
-	}
-
-	/* Write pid to file */
-	pidlen = snprintf ( pid, sizeof ( pid ), "%d\n", getpid() );
-	if ( write ( fd, pid, pidlen ) != pidlen ) {
-		logmsg ( LOG_ERR, "Could not write %s: %s\n",
-			 pidfile, strerror ( errno ) );
-		goto err;
-	}
-
-	close ( fd );
-	return 0;
-
- err:
-	if ( fd >= 0 )
-		close ( fd );
-	return -1;
-}
-
-int main ( int argc, char **argv ) {
-	struct hijack_options options;
-	struct hijack_listener listener;
-	struct sigaction sa;
-
-	/* Parse command-line options */
-	if ( parse_options ( argc, argv, &options ) < 0 )
-		exit ( 1 );
-
-	/* Set up syslog connection */
-	openlog ( basename ( argv[0] ), LOG_PID, LOG_DAEMON );
-
-	/* Set up listening socket */
-	if ( open_listener ( options.interface, &listener ) < 0 )
-		exit ( 1 );
-
-	/* Daemonise on demand */
-	if ( options.daemonise ) {
-		if ( daemonise ( options.interface ) < 0 )
-			exit ( 1 );
-	}
-
-	/* Avoid creating zombies */
-	memset ( &sa, 0, sizeof ( sa ) );
-	sa.sa_handler = SIG_IGN;
-	sa.sa_flags = SA_RESTART | SA_NOCLDWAIT;
-	if ( sigaction ( SIGCHLD, &sa, NULL ) < 0 ) {
-		logmsg ( LOG_ERR, "Could not set SIGCHLD handler: %s",
-			 strerror ( errno ) );
-		exit ( 1 );
-	}
-
-	/* Set 'signalled' flag on SIGINT or SIGHUP */
-	sa.sa_handler = flag_signalled;
-	sa.sa_flags = SA_RESTART | SA_RESETHAND;
-	if ( sigaction ( SIGINT, &sa, NULL ) < 0 ) {
-		logmsg ( LOG_ERR, "Could not set SIGINT handler: %s",
-			 strerror ( errno ) );
-		exit ( 1 );
-	}
-	if ( sigaction ( SIGHUP, &sa, NULL ) < 0 ) {
-		logmsg ( LOG_ERR, "Could not set SIGHUP handler: %s",
-			 strerror ( errno ) );
-		exit ( 1 );
-	}
-
-	/* Listen for hijackers */
-	if ( listen_for_hijackers ( &listener, options.interface ) < 0 )
-		exit ( 1 );
-
-	close_listener ( &listener );
-	
-	return 0;
-}