+#define MAXIFNAMELEN 32 /* max length of interface name; or use IFNAMSIZ, can we
+ always include net/if.h? */
+
+/*
+ * If PPP_DRV_NAME is not defined, use the default "ppp" as the device name.
+ * Where should PPP_DRV_NAME come from? Do we include it here?
+ */
+#if !defined(PPP_DRV_NAME)
+#define PPP_DRV_NAME "ppp"
+#endif /* !defined(PPP_DRV_NAME) */
+
+/*
+ * Option descriptor structure.
+ */
+
+typedef unsigned char bool;
+
+enum opt_type {
+ o_special_noarg = 0,
+ o_special = 1,
+ o_bool,
+ o_int,
+ o_uint32,
+ o_string,
+ o_wild
+};
+
+typedef struct {
+ char *name; /* name of the option */
+ enum opt_type type;
+ void *addr;
+ char *description;
+ unsigned int flags;
+ void *addr2;
+ int upper_limit;
+ int lower_limit;
+ const char *source;
+ short int priority;
+ short int winner;
+} option_t;
+
+/* Values for flags */
+#define OPT_VALUE 0xff /* mask for presupplied value */
+#define OPT_HEX 0x100 /* int option is in hex */
+#define OPT_NOARG 0x200 /* option doesn't take argument */
+#define OPT_OR 0x400 /* for u32, OR in argument to value */
+#define OPT_INC 0x400 /* for o_int, increment value */
+#define OPT_A2OR 0x800 /* for o_bool, OR arg to *(u_char *)addr2 */
+#define OPT_PRIV 0x1000 /* privileged option */
+#define OPT_STATIC 0x2000 /* string option goes into static array */
+#define OPT_NOINCR 0x2000 /* for o_int, value mustn't be increased */
+#define OPT_LLIMIT 0x4000 /* check value against lower limit */
+#define OPT_ULIMIT 0x8000 /* check value against upper limit */
+#define OPT_LIMITS (OPT_LLIMIT|OPT_ULIMIT)
+#define OPT_ZEROOK 0x10000 /* 0 value is OK even if not within limits */
+#define OPT_HIDE 0x10000 /* for o_string, print value as ?????? */
+#define OPT_A2LIST 0x20000 /* for o_special, keep list of values */
+#define OPT_A2CLRB 0x20000 /* o_bool, clr val bits in *(u_char *)addr2 */
+#define OPT_ZEROINF 0x40000 /* with OPT_NOINCR, 0 == infinity */
+#define OPT_PRIO 0x80000 /* process option priorities for this option */
+#define OPT_PRIOSUB 0x100000 /* subsidiary member of priority group */
+#define OPT_ALIAS 0x200000 /* option is alias for previous option */
+#define OPT_A2COPY 0x400000 /* addr2 -> second location to rcv value */
+#define OPT_ENABLE 0x800000 /* use *addr2 as enable for option */
+#define OPT_A2CLR 0x1000000 /* clear *(bool *)addr2 */
+#define OPT_PRIVFIX 0x2000000 /* user can't override if set by root */
+#define OPT_INITONLY 0x4000000 /* option can only be set in init phase */
+#define OPT_DEVEQUIV 0x8000000 /* equiv to device name */
+#define OPT_DEVNAM (OPT_INITONLY | OPT_DEVEQUIV)
+#define OPT_A2PRINTER 0x10000000 /* *addr2 printer_func to print option */
+#define OPT_A2STRVAL 0x20000000 /* *addr2 points to current string value */
+#define OPT_NOPRINT 0x40000000 /* don't print this option at all */
+
+#define OPT_VAL(x) ((x) & OPT_VALUE)
+
+/* Values for priority */
+#define OPRIO_DEFAULT 0 /* a default value */
+#define OPRIO_CFGFILE 1 /* value from a configuration file */
+#define OPRIO_CMDLINE 2 /* value from the command line */
+#define OPRIO_SECFILE 3 /* value from options in a secrets file */
+#define OPRIO_ROOT 100 /* added to priority if OPT_PRIVFIX && root */
+
+#ifndef GIDSET_TYPE
+#define GIDSET_TYPE gid_t
+#endif
+
+/* Structure representing a list of permitted IP addresses. */
+struct permitted_ip {
+ int permit; /* 1 = permit, 0 = forbid */
+ u_int32_t base; /* match if (addr & mask) == base */
+ u_int32_t mask; /* base and mask are in network byte order */
+};
+
+/*
+ * Unfortunately, the linux kernel driver uses a different structure
+ * for statistics from the rest of the ports.
+ * This structure serves as a common representation for the bits
+ * pppd needs.
+ */
+struct pppd_stats {
+ unsigned int bytes_in;
+ unsigned int bytes_out;
+ unsigned int pkts_in;
+ unsigned int pkts_out;
+};
+
+/* Used for storing a sequence of words. Usually malloced. */
+struct wordlist {
+ struct wordlist *next;
+ char *word;
+};
+
+/* An endpoint discriminator, used with multilink. */
+#define MAX_ENDP_LEN 20 /* maximum length of discriminator value */
+struct epdisc {
+ unsigned char class;
+ unsigned char length;
+ unsigned char value[MAX_ENDP_LEN];
+};
+
+/* values for epdisc.class */
+#define EPD_NULL 0 /* null discriminator, no data */
+#define EPD_LOCAL 1
+#define EPD_IP 2
+#define EPD_MAC 3
+#define EPD_MAGIC 4
+#define EPD_PHONENUM 5
+
+typedef void (*notify_func) __P((void *, int));
+typedef void (*printer_func) __P((void *, char *, ...));
+
+struct notifier {
+ struct notifier *next;
+ notify_func func;
+ void *arg;
+};
+
+/*
+ * Global variables.
+ */
+
+extern int hungup; /* Physical layer has disconnected */
+extern int ifunit; /* Interface unit number */
+extern char ifname[]; /* Interface name */
+extern char hostname[]; /* Our hostname */
+extern u_char outpacket_buf[]; /* Buffer for outgoing packets */
+extern int devfd; /* fd of underlying device */
+extern int fd_ppp; /* fd for talking PPP */
+extern int phase; /* Current state of link - see values below */
+extern int baud_rate; /* Current link speed in bits/sec */
+extern char *progname; /* Name of this program */
+extern int redirect_stderr;/* Connector's stderr should go to file */
+extern char peer_authname[];/* Authenticated name of peer */
+extern int auth_done[NUM_PPP]; /* Methods actually used for auth */
+extern int privileged; /* We were run by real-uid root */
+extern int need_holdoff; /* Need holdoff period after link terminates */
+extern char **script_env; /* Environment variables for scripts */
+extern int detached; /* Have detached from controlling tty */
+extern GIDSET_TYPE groups[NGROUPS_MAX]; /* groups the user is in */
+extern int ngroups; /* How many groups valid in groups */
+extern struct pppd_stats link_stats; /* byte/packet counts etc. for link */
+extern int link_stats_valid; /* set if link_stats is valid */
+extern unsigned link_connect_time; /* time the link was up for */
+extern int using_pty; /* using pty as device (notty or pty opt.) */
+extern int log_to_fd; /* logging to this fd as well as syslog */
+extern bool log_default; /* log_to_fd is default (stdout) */
+extern char *no_ppp_msg; /* message to print if ppp not in kernel */
+extern volatile int status; /* exit status for pppd */
+extern bool devnam_fixed; /* can no longer change devnam */
+extern int unsuccess; /* # unsuccessful connection attempts */
+extern int do_callback; /* set if we want to do callback next */
+extern int doing_callback; /* set if this is a callback */
+extern int error_count; /* # of times error() has been called */
+extern char ppp_devnam[MAXPATHLEN];
+extern char remote_number[MAXNAMELEN]; /* Remote telephone number, if avail. */
+extern int ppp_session_number; /* Session number (eg PPPoE session) */
+extern int fd_devnull; /* fd open to /dev/null */
+
+extern int listen_time; /* time to listen first (ms) */
+extern bool doing_multilink;
+extern bool multilink_master;
+extern bool bundle_eof;
+extern bool bundle_terminating;
+
+extern struct notifier *pidchange; /* for notifications of pid changing */
+extern struct notifier *phasechange; /* for notifications of phase changes */
+extern struct notifier *exitnotify; /* for notification that we're exiting */
+extern struct notifier *sigreceived; /* notification of received signal */
+extern struct notifier *ip_up_notifier; /* IPCP has come up */
+extern struct notifier *ip_down_notifier; /* IPCP has gone down */
+extern struct notifier *ipv6_up_notifier; /* IPV6CP has come up */
+extern struct notifier *ipv6_down_notifier; /* IPV6CP has gone down */
+extern struct notifier *auth_up_notifier; /* peer has authenticated */
+extern struct notifier *link_down_notifier; /* link has gone down */
+extern struct notifier *fork_notifier; /* we are a new child process */
+
+/* Values for do_callback and doing_callback */
+#define CALLBACK_DIALIN 1 /* we are expecting the call back */
+#define CALLBACK_DIALOUT 2 /* we are dialling out to call back */
+
+/*
+ * Variables set by command-line options.
+ */
+
+extern int debug; /* Debug flag */
+extern int kdebugflag; /* Tell kernel to print debug messages */
+extern int default_device; /* Using /dev/tty or equivalent */
+extern char devnam[MAXPATHLEN]; /* Device name */
+extern int crtscts; /* Use hardware flow control */
+extern int stop_bits; /* Number of serial port stop bits */
+extern bool modem; /* Use modem control lines */
+extern int inspeed; /* Input/Output speed requested */
+extern u_int32_t netmask; /* IP netmask to set on interface */
+extern bool lockflag; /* Create lock file to lock the serial dev */
+extern bool nodetach; /* Don't detach from controlling tty */
+#ifdef SYSTEMD
+extern bool up_sdnotify; /* Notify systemd once link is up (implies nodetach) */
+#endif
+extern bool updetach; /* Detach from controlling tty when link up */
+extern bool master_detach; /* Detach when multilink master without link */
+extern char *initializer; /* Script to initialize physical link */
+extern char *connect_script; /* Script to establish physical link */
+extern char *disconnect_script; /* Script to disestablish physical link */
+extern char *welcomer; /* Script to welcome client after connection */
+extern char *ptycommand; /* Command to run on other side of pty */
+extern int maxconnect; /* Maximum connect time (seconds) */
+extern char user[MAXNAMELEN];/* Our name for authenticating ourselves */
+extern char passwd[MAXSECRETLEN]; /* Password for PAP or CHAP */
+extern bool auth_required; /* Peer is required to authenticate */
+extern bool persist; /* Reopen link after it goes down */
+extern bool uselogin; /* Use /etc/passwd for checking PAP */
+extern bool session_mgmt; /* Do session management (login records) */
+extern char our_name[MAXNAMELEN];/* Our name for authentication purposes */
+extern char remote_name[MAXNAMELEN]; /* Peer's name for authentication */
+extern bool explicit_remote;/* remote_name specified with remotename opt */
+extern bool demand; /* Do dial-on-demand */
+extern char *ipparam; /* Extra parameter for ip up/down scripts */
+extern bool cryptpap; /* Others' PAP passwords are encrypted */
+extern int idle_time_limit;/* Shut down link if idle for this long */
+extern int holdoff; /* Dead time before restarting */
+extern bool holdoff_specified; /* true if user gave a holdoff value */
+extern bool notty; /* Stdin/out is not a tty */
+extern char *pty_socket; /* Socket to connect to pty */
+extern char *record_file; /* File to record chars sent/received */
+extern bool sync_serial; /* Device is synchronous serial device */
+extern int maxfail; /* Max # of unsuccessful connection attempts */
+extern char linkname[MAXPATHLEN]; /* logical name for link */
+extern bool tune_kernel; /* May alter kernel settings as necessary */
+extern int connect_delay; /* Time to delay after connect script */
+extern int max_data_rate; /* max bytes/sec through charshunt */
+extern int req_unit; /* interface unit number to use */
+extern char req_ifname[MAXIFNAMELEN]; /* interface name to use */
+extern bool multilink; /* enable multilink operation */
+extern bool noendpoint; /* don't send or accept endpt. discrim. */
+extern char *bundle_name; /* bundle name for multilink */
+extern bool dump_options; /* print out option values */
+extern bool dryrun; /* check everything, print options, exit */
+extern int child_wait; /* # seconds to wait for children at end */
+
+#ifdef MAXOCTETS
+extern unsigned int maxoctets; /* Maximum octetes per session (in bytes) */
+extern int maxoctets_dir; /* Direction :
+ 0 - in+out (default)
+ 1 - in
+ 2 - out
+ 3 - max(in,out) */
+extern int maxoctets_timeout; /* Timeout for check of octets limit */
+#define PPP_OCTETS_DIRECTION_SUM 0
+#define PPP_OCTETS_DIRECTION_IN 1
+#define PPP_OCTETS_DIRECTION_OUT 2
+#define PPP_OCTETS_DIRECTION_MAXOVERAL 3
+/* same as previos, but little different on RADIUS side */
+#define PPP_OCTETS_DIRECTION_MAXSESSION 4
+#endif
+
+#ifdef PPP_FILTER
+extern struct bpf_program pass_filter; /* Filter for pkts to pass */
+extern struct bpf_program active_filter; /* Filter for link-active pkts */
+#endif
+
+#ifdef MSLANMAN
+extern bool ms_lanman; /* Use LanMan password instead of NT */
+ /* Has meaning only with MS-CHAP challenges */
+#endif
+
+/* Values for auth_pending, auth_done */
+#define PAP_WITHPEER 0x1
+#define PAP_PEER 0x2
+#define CHAP_WITHPEER 0x4
+#define CHAP_PEER 0x8
+#define EAP_WITHPEER 0x10
+#define EAP_PEER 0x20
+
+/* Values for auth_done only */
+#define CHAP_MD5_WITHPEER 0x40
+#define CHAP_MD5_PEER 0x80
+#define CHAP_MS_SHIFT 8 /* LSB position for MS auths */
+#define CHAP_MS_WITHPEER 0x100
+#define CHAP_MS_PEER 0x200
+#define CHAP_MS2_WITHPEER 0x400
+#define CHAP_MS2_PEER 0x800
+
+extern char *current_option; /* the name of the option being parsed */
+extern int privileged_option; /* set iff the current option came from root */
+extern char *option_source; /* string saying where the option came from */
+extern int option_priority; /* priority of current options */