| File:xl2tpd.c --------------------------------------------------------------------------------------- int main (int argc, char *argv[]) { init(argc,argv); #NOTE:主要用于处理参数解析和配置文件解析 dial_no_tmp &＃61; calloc (128, sizeof (char)); network_thread (); return 0; } |
| # xl2tpd --help xl2tpd version: xl2tpd-1.3.6 Usage: xl2tpd [-c configfile ] [-s secrec_file] [-p pid_file] [-C control_file] [-D] [-l] [-v, --version] |
| File: file.h ------------------------------------------------------------------------------------- struct global { unsigned int listenaddr; /* IP address to bind to */ int port; /* Port number to listen to */ char authfile[STRLEN]; /* File containing authentication info */ char altauthfile[STRLEN]; /* File containing authentication info */ char configfile[STRLEN]; /* File containing configuration info */ char altconfigfile[STRLEN]; /* File containing configuration info */ char pidfile[STRLEN]; /* File containing the pid number*/ char controlfile[STRLEN]; /* Control file name (named pipe) */ int daemon; /* Use daemon mode? */ int syslog; /* Use syslog for logging? */ int accesscontrol; /* Use access control? */ int forceuserspace; /* Force userspace? */ int packet_dump; /* Dump (print) all packets? */ int debug_avp; /* Print AVP debugging info? */ int debug_network; /* Print network debugging info? */ int debug_tunnel; /* Print tunnel debugging info? */ int debug_state; /* Print FSM debugging info? */ int ipsecsaref; int sarefnum; /* Value of IPSEC_REFINFO used by kernel (we used to pick 22, but 2.6.36&＃43; took that, so now we pick 30) * Changed in SAref patch in openswan 2.6.36 for linux 2.6.36&＃43; */ }; struct lns { struct lns *next; int exclusive; /* Only one tunnel per host? */ int active; /* Is this actively in use? */ unsigned int localaddr; /* Local IP for PPP connections */ int tun_rws; /* Receive window size (tunnel) */ int call_rws; /* Call rws */ int rxspeed; /* Tunnel rx speed */ int txspeed; /* Tunnel tx speed */ int hbit; /* Permit hidden AVP&＃39;s? */ int lbit; /* Use the length field? */ int challenge; /* Challenge authenticate the peer? */ int authpeer; /* Authenticate our peer? */ int authself; /* Authenticate ourselves? */ char authname[STRLEN]; /* Who we authenticate as */ char peername[STRLEN]; /* Force peer name to this */ char hostname[STRLEN]; /* Hostname to report */ char entname[STRLEN]; /* Name of this entry */ struct iprange *lacs; /* Hosts permitted to connect */ struct iprange *range; /* Range of IP&＃39;s we provide */ int assign_ip; /* Do we actually provide IP addresses? */ int passwdauth; /* Authenticate by passwd file? (or PAM) */ int pap_require; /* Require PAP auth for PPP */ int chap_require; /* Require CHAP auth for PPP */ int pap_refuse; /* Refuse PAP authentication for us */ int chap_refuse; /* Refuse CHAP authentication for us */ int idle; /* Idle timeout in seconds */ unsigned int pridns; /* Primary DNS server */ unsigned int secdns; /* Secondary DNS server */ unsigned int priwins; /* Primary WINS server */ unsigned int secwins; /* Secondary WINS server */ int proxyarp; /* Use proxy-arp? */ int proxyauth; /* Allow proxy authentication? */ int debug; /* Debug PPP? */ int pass_peer; /* Pass peer IP to pppd as ipparam? */ char pppoptfile[STRLEN]; /* File containing PPP options */ struct tunnel *t; /* Tunnel of this, if it&＃39;s ready */ }; struct lac { struct lac *next; struct host *lns; /* LNS&＃39;s we can connect to */ struct schedule_entry *rsched; int tun_rws; /* Receive window size (tunnel) */ int call_rws; /* Call rws */ int rxspeed; /* Tunnel rx speed */ int txspeed; /* Tunnel tx speed */ int active; /* Is this connection in active use? */ int hbit; /* Permit hidden AVP&＃39;s? */ int lbit; /* Use the length field? */ int challenge; /* Challenge authenticate the peer? */ unsigned int localaddr; /* Local IP address */ unsigned int remoteaddr; /* Force remote address to this */ char authname[STRLEN]; /* Who we authenticate as */ char password[STRLEN]; /* Password to authenticate with */ char peername[STRLEN]; /* Force peer name to this */ char hostname[STRLEN]; /* Hostname to report */ char entname[STRLEN]; /* Name of this entry */ int authpeer; /* Authenticate our peer? */ int authself; /* Authenticate ourselves? */ int pap_require; /* Require PAP auth for PPP */ int chap_require; /* Require CHAP auth for PPP */ int pap_refuse; /* Refuse PAP authentication for us */ int chap_refuse; /* Refuse CHAP authentication for us */ int idle; /* Idle timeout in seconds */ int autodial; /* Try to dial immediately? */ int defaultroute; /* Use as default route? */ int redial; /* Redial if disconnected */ int rmax; /* Maximum # of consecutive redials */ int rtries; /* # of tries so far */ int rtimeout; /* Redial every this many # of seconds */ int pass_peer; /* Pass peer IP to pppd as ipparam? */ char pppoptfile[STRLEN]; /* File containing PPP options */ int debug; struct tunnel *t; /* Our tunnel */ struct call *c; /* Our call */ }; |
| File: xl2tpd.c ----------------------------------------------------------------------------------------- void init (int argc,char *argv[]) { struct lac *lac; struct in_addr listenaddr; struct utsname uts; init_args (argc,argv); #NOTE:命令行参数初始化 srand( time(NULL) ); rand_source &＃61; 0; init_addr (); if (init_config ()) { l2tp_log (LOG_CRIT, "%s: Unable to load config file\n", __FUNCTION__); exit (1); } if (uname (&uts)<0) { l2tp_log (LOG_CRIT, "%s : Unable to determine host system\n", __FUNCTION__); exit (1); } init_tunnel_list (&tunnels); if (init_network ()) exit (1); if (gconfig.daemon) daemonize (); consider_pidfile(); signal (SIGTERM, &sigterm_handler); signal (SIGINT, &sigint_handler); signal (SIGCHLD, &sigchld_handler); signal (SIGUSR1, &sigusr1_handler); signal (SIGHUP, &sighup_handler); signal (SIGPIPE, SIG_IGN); init_scheduler (); unlink(gconfig.controlfile); mkfifo (gconfig.controlfile, 0600); open_controlfd(); l2tp_log (LOG_INFO, "xl2tpd version " SERVER_VERSION " started on %s PID:%d\n", hostname, getpid ()); l2tp_log (LOG_INFO, "Written by Mark Spencer, Copyright (C) 1998, Adtran, Inc.\n"); l2tp_log (LOG_INFO, "Forked by Scott Balmos and David Stipp, (C) 2001\n"); l2tp_log (LOG_INFO, "Inherited by Jeff McAdams, (C) 2002\n"); l2tp_log (LOG_INFO, "Forked again by Xelerance (www.xelerance.com) (C) 2006\n"); listenaddr.s_addr &＃61; gconfig.listenaddr; l2tp_log (LOG_INFO, "Listening on IP address %s, port %d\n", inet_ntoa(listenaddr), gconfig.port); lac &＃61; laclist; while (lac) { if (lac->autodial) { #ifdef DEBUG_MAGIC l2tp_log (LOG_DEBUG, "%s: Autodialing &＃39;%s&＃39;\n", __FUNCTION__, lac->entname[0] ? lac->entname : "(unnamed)"); #endif lac->active &＃61; -1; switch_io &＃61; 1; /* If we&＃39;re a LAC, autodials will be ICRQ&＃39;s */ magic_lac_dial (lac); } lac &＃61; lac->next; } } |
| File:xl2tpd.c ------------------------------------------------------------------------------------------- void init_args(int argc, char *argv[]) { int i&＃61;0; gconfig.daemon&＃61;1; #NOTE: 以damon模式运行 gconfig.syslog&＃61;-1; #NOTE: 关闭syslog memset(gconfig.altauthfile,0,STRLEN); memset(gconfig.altconfigfile,0,STRLEN); memset(gconfig.authfile,0,STRLEN); memset(gconfig.configfile,0,STRLEN); memset(gconfig.pidfile,0,STRLEN); memset(gconfig.controlfile,0,STRLEN); strncpy(gconfig.altauthfile,ALT_DEFAULT_AUTH_FILE, #NOTE: #define ALT_DEFAULT_AUTH_FILE "/etc/l2tpd/l2tp-secrets" file.h sizeof(gconfig.altauthfile) - 1); strncpy(gconfig.altconfigfile,ALT_DEFAULT_CONFIG_FILE, #NOTE: #define ALT_DEFAULT_CONFIG_FILE "/etc/l2tp/l2tpd.conf" file.h sizeof(gconfig.altconfigfile) - 1); strncpy(gconfig.authfile,DEFAULT_AUTH_FILE, #NOTE: #ifndef DEFAULT_AUTH_FILE #define DEFAULT_AUTH_FILE "/etc/xl2tpd/l2tp-secrets" #endif file.h sizeof(gconfig.authfile) - 1); strncpy(gconfig.configfile,DEFAULT_CONFIG_FILE, #NOTE: #ifndef DEFAULT_CONFIG_FILE #define DEFAULT_CONFIG_FILE "/etc/xl2tpd/xl2tpd.conf" #endif file.h sizeof(gconfig.configfile) - 1); strncpy(gconfig.pidfile,DEFAULT_PID_FILE, #NOTE: #define DEFAULT_PID_FILE "/var/run/xl2tpd.pid" file.h sizeof(gconfig.pidfile) - 1); strncpy(gconfig.controlfile,CONTROL_PIPE, #NOTE:#define CONTROL_PIPE "/var/run/xl2tpd/l2tp-control" l2tp.h sizeof(gconfig.controlfile) - 1); gconfig.ipsecsaref &＃61; 0; for (i &＃61; 1; i || (! strncmp(argv[i],"-v",2))) { printf("\nxl2tpd version: %s\n",SERVER_VERSION); exit(1); } if(! strncmp(argv[i],"-c",2)) { if(&＃43;&＃43;i &＃61;&＃61; argc) usage(); else strncpy(gconfig.configfile,argv[i], sizeof(gconfig.configfile) - 1); } else if (! strncmp(argv[i],"-D",2)) { gconfig.daemon&＃61;0; } else if (! strncmp(argv[i],"-l",2)) { gconfig.syslog&＃61;1; } else if (! strncmp(argv[i],"-s",2)) { if(&＃43;&＃43;i &＃61;&＃61; argc) usage(); else strncpy(gconfig.authfile,argv[i], sizeof(gconfig.authfile) - 1); } else if (! strncmp(argv[i],"-p",2)) { if(&＃43;&＃43;i &＃61;&＃61; argc) usage(); else strncpy(gconfig.pidfile,argv[i], sizeof(gconfig.pidfile) - 1); } else if (! strncmp(argv[i],"-C",2)) { if(&＃43;&＃43;i &＃61;&＃61; argc) usage(); else strncpy(gconfig.controlfile,argv[i], sizeof(gconfig.controlfile) - 1); } else { usage(); } } /* * defaults to syslog if no log facility was explicitly * specified and we are about to daemonize */ if (gconfig.syslog <0) gconfig.syslog &＃61; gconfig.daemon; } |
| File: file.c ---------------------------------------------------------------------------------------------------------------- int init_config () { FILE *f; int returnedValue; gconfig.port &＃61; UDP_LISTEN_PORT; #NOTE: #define UDP_LISTEN_PORT 1701 l2ttp.h gconfig.sarefnum &＃61; IP_IPSEC_REFINFO; /* default use the latest we know */ gconfig.listenaddr &＃61; htonl(INADDR_ANY); #NOTE: 默认监听所有的IP地址 gconfig.debug_avp &＃61; 0; gconfig.debug_network &＃61; 0; gconfig.packet_dump &＃61; 0; gconfig.debug_tunnel &＃61; 0; gconfig.debug_state &＃61; 0; lnslist &＃61; NULL; laclist &＃61; NULL; deflac &＃61; (struct lac *) calloc (1, sizeof (struct lac)); f &＃61; fopen (gconfig.configfile, "r"); if (!f) { f &＃61; fopen (gconfig.altconfigfile, "r"); if (f) { l2tp_log (LOG_WARNING, "%s: Using old style config files %s and %s\n", __FUNCTION__, gconfig.altconfigfile, gconfig.altauthfile); strncpy (gconfig.authfile, gconfig.altauthfile, sizeof (gconfig.authfile)); } else { l2tp_log (LOG_CRIT, "%s: Unable to open config file %s or %s\n", __FUNCTION__, gconfig.configfile, gconfig.altconfigfile); return -1; } } returnedValue &＃61; parse_config (f); fclose (f); return (returnedValue); filerr[0] &＃61; 0; } |
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