Based on the basic firewall principle, firstly, themain firewall penetrating techniqueswas ana- lysed.Then using inverse connection andHTTP-tunnel to pass through firewallswas proposed, and reali- zes sharingDNS sockethandle technique.

httptunnel-3.3\acconfig.h
..............\acinclude.m4
..............\aclocal.m4
..............\AUTHORS
..............\base64.c
..............\base64.h
..............\ChangeLog
..............\common.c
..............\common.h
..............\config.h.in
..............\configure
..............\configure.in
..............\COPYING
..............\debian\changelog
..............\......\control
..............\......\copyright
..............\......\dirs
..............\......\docs
..............\......\postinst
..............\......\prerm
..............\......\rules
..............\debian
..............\DISCLAIMER
..............\doc\rfc1945.txt
..............\...\rfc2045.txt
..............\...\rfc2068.txt
..............\doc
..............\FAQ
..............\HACKING
..............\htc.1
..............\htc.c
..............\hts.1
..............\hts.c
..............\http.c
..............\http.h
..............\INSTALL
..............\install-sh
..............\Makefile.am
..............\Makefile.in
..............\missing
..............\mkinstalldirs
..............\NEWS
..............\port\daemon.c
..............\....\endprotoent.c
..............\....\getopt.c
..............\....\getopt.h
..............\....\getopt1.c
..............\....\Makefile.am
..............\....\Makefile.in
..............\....\netdb_.h
..............\....\poll.c
..............\....\stdio_.h
..............\....\.ys\Makefile.am
..............\....\...\Makefile.in
..............\....\...\poll_.h
..............\....\sys
..............\....\syslog_.h
..............\....\unistd_.h
..............\....\vsnprintf.c
..............\....\vsyslog.c
..............\port
..............\README
..............\stamp-h.in
..............\TODO
..............\tunnel.c
..............\tunnel.h
httptunnel-3.3

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