based on the Linux environment PPPOE source, can be used as a reference beginners.

pppd-2.4.1
..........\Changes-2.3
..........\chat
..........\....\chat.8
..........\....\chat.c
..........\....\Makefile
..........\....\Makefile.linux
..........\....\Makefile.sol2
..........\....\Makefile.sunos4
..........\common
..........\......\zlib.c
..........\......\zlib.h
..........\configure
..........\contrib
..........\.......\pppgetpass
..........\.......\..........\Makefile.linux
..........\.......\..........\pppgetpass.8
..........\.......\..........\pppgetpass.gtk.c
..........\.......\..........\pppgetpass.sh
..........\.......\..........\pppgetpass.vt.c
..........\etc.ppp
..........\.......\chap-secrets
..........\.......\options
..........\.......\pap-secrets
..........\FAQ
..........\include
..........\.......\linux
..........\.......\.....\if_ppp.h
..........\.......\.....\if_pppvar.h
..........\.......\.....\ppp-comp.h
..........\.......\.....\ppp_defs.h
..........\.......\net
..........\.......\...\if_ppp.h
..........\.......\...\ppp-comp.h
..........\.......\...\pppio.h
..........\.......\...\ppp_defs.h
..........\.......\...\slcompress.h
..........\.......\...\vjcompress.h
..........\.......\openssl
..........\.......\.......\opensslconf.h
..........\.......\.......\opensslv.h
..........\.......\.......\sha.h
..........\.......\pcap-int.h
..........\linux
..........\.....\Makefile.top
..........\Makefile
..........\modules
..........\.......\bsd-comp.c
..........\.......\deflate.c
..........\.......\if_ppp.c
..........\.......\ppp.c
..........\.......\ppp_ahdlc.c
..........\.......\ppp_comp.c
..........\.......\ppp_mod.h
..........\.......\vjcompress.c
..........\PLUGINS
..........\pppd
..........\....\.cvsignore
..........\....\auth.c
..........\....\cbcp.c
..........\....\cbcp.h
..........\....\ccp.c
..........\....\ccp.h
..........\....\chap.c
..........\....\chap.h
..........\....\chap_ms.c
..........\....\chap_ms.h
..........\....\demand.c
..........\....\eui64.c
..........\....\eui64.h
..........\....\extra_crypto.c
..........\....\extra_crypto.h
..........\....\fsm.c
..........\....\fsm.h
..........\....\getnet.c
..........\....\ipcp.c
..........\....\ipcp.h
..........\....\ipv6cp.c
..........\....\ipv6cp.h
..........\....\ipxcp.c
..........\....\ipxcp.h
..........\....\lcp.c
..........\....\lcp.h
..........\....\magic.c
..........\....\magic.h
..........\....\main.c
..........\....\Makefile
..........\....\Makefile.linux
..........\....\Makefile.sol2
..........\....\Makefile.sunos4
..........\....\md32_common.h
..........\....\md4.c
..........\....\md4.h
..........\....\md5.c
..........\....\md5.h
..........\....\mppe.c
..........\....\mppe.h
..........\....\multilink.c
..........\....\options.c
..........\....\patchlevel.h

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