+int auth_ip_addr __P((int, u_int32_t));
+ /* check if IP address is authorized */
+int bad_ip_adrs __P((u_int32_t));
+ /* check if IP address is unreasonable */
+void check_access __P((FILE *, char *));
+ /* check permissions on secrets file */
+
+/* Procedures exported from demand.c */
+void demand_conf __P((void)); /* config interface(s) for demand-dial */
+void demand_block __P((void)); /* set all NPs to queue up packets */
+void demand_unblock __P((void)); /* set all NPs to pass packets */
+void demand_discard __P((void)); /* set all NPs to discard packets */
+void demand_rexmit __P((int)); /* retransmit saved frames for an NP */
+int loop_chars __P((unsigned char *, int)); /* process chars from loopback */
+int loop_frame __P((unsigned char *, int)); /* process frame from loopback */
+
+/* Procedures exported from sys-*.c */
+void sys_init __P((void)); /* Do system-dependent initialization */
+void sys_cleanup __P((void)); /* Restore system state before exiting */
+void sys_check_options __P((void)); /* Check options specified */
+void sys_close __P((void)); /* Clean up in a child before execing */
+int ppp_available __P((void)); /* Test whether ppp kernel support exists */
+void open_ppp_loopback __P((void)); /* Open loopback for demand-dialling */
+void establish_ppp __P((int)); /* Turn serial port into a ppp interface */
+void restore_loop __P((void)); /* Transfer ppp unit back to loopback */
+void disestablish_ppp __P((int)); /* Restore port to normal operation */
+void clean_check __P((void)); /* Check if line was 8-bit clean */
+void set_up_tty __P((int, int)); /* Set up port's speed, parameters, etc. */
+void restore_tty __P((int)); /* Restore port's original parameters */
+void setdtr __P((int, int)); /* Raise or lower port's DTR line */
+void output __P((int, u_char *, int)); /* Output a PPP packet */
+void wait_input __P((struct timeval *));
+ /* Wait for input, with timeout */
+void wait_loop_output __P((struct timeval *));
+ /* Wait for pkt from loopback, with timeout */
+void wait_time __P((struct timeval *)); /* Wait for given length of time */
+int read_packet __P((u_char *)); /* Read PPP packet */
+int get_loop_output __P((void)); /* Read pkts from loopback */
+void ppp_send_config __P((int, int, u_int32_t, int, int));
+ /* Configure i/f transmit parameters */
+void ppp_set_xaccm __P((int, ext_accm));
+ /* Set extended transmit ACCM */
+void ppp_recv_config __P((int, int, u_int32_t, int, int));
+ /* Configure i/f receive parameters */
+int ccp_test __P((int, u_char *, int, int));
+ /* Test support for compression scheme */
+void ccp_flags_set __P((int, int, int));
+ /* Set kernel CCP state */
+int ccp_fatal_error __P((int)); /* Test for fatal decomp error in kernel */
+int get_idle_time __P((int, struct ppp_idle *));
+ /* Find out how long link has been idle */
+int sifvjcomp __P((int, int, int, int));
+ /* Configure VJ TCP header compression */
+int sifup __P((int)); /* Configure i/f up (for IP) */
+int sifnpmode __P((int u, int proto, enum NPmode mode));
+ /* Set mode for handling packets for proto */
+int sifdown __P((int)); /* Configure i/f down (for IP) */
+int sifaddr __P((int, u_int32_t, u_int32_t, u_int32_t));
+ /* Configure IP addresses for i/f */
+int cifaddr __P((int, u_int32_t, u_int32_t));
+ /* Reset i/f IP addresses */
+int sifdefaultroute __P((int, u_int32_t, u_int32_t));
+ /* Create default route through i/f */
+int cifdefaultroute __P((int, u_int32_t, u_int32_t));
+ /* Delete default route through i/f */
+int sifproxyarp __P((int, u_int32_t));
+ /* Add proxy ARP entry for peer */
+int cifproxyarp __P((int, u_int32_t));
+ /* Delete proxy ARP entry for peer */
+u_int32_t GetMask __P((u_int32_t)); /* Get appropriate netmask for address */
+int lock __P((char *)); /* Create lock file for device */
+void unlock __P((void)); /* Delete previously-created lock file */
+int daemon __P((int, int)); /* Detach us from terminal session */
+void logwtmp __P((const char *, const char *, const char *));
+ /* Write entry to wtmp file */
+int get_host_seed __P((void)); /* Get host-dependent random number seed */
+#ifdef PPP_FILTER
+int set_filters __P((struct bpf_program *pass, struct bpf_program *active));
+ /* Set filter programs in kernel */
+#endif
+
+/* Procedures exported from options.c */
+int parse_args __P((int argc, char **argv));
+ /* Parse options from arguments given */
+void usage __P((void)); /* Print a usage message */
+int options_from_file __P((char *filename, int must_exist, int check_prot,
+ int privileged));
+ /* Parse options from an options file */
+int options_from_user __P((void)); /* Parse options from user's .ppprc */
+int options_for_tty __P((void)); /* Parse options from /etc/ppp/options.tty */
+void scan_args __P((int argc, char **argv));
+ /* Look for tty name in command-line args */
+int getword __P((FILE *f, char *word, int *newlinep, char *filename));
+ /* Read a word from a file */
+void option_error __P((char *fmt, ...));
+ /* Print an error message about an option */
+
+/*
+ * This structure is used to store information about certain
+ * options, such as where the option value came from (/etc/ppp/options,
+ * command line, etc.) and whether it came from a privileged source.
+ */
+
+struct option_info {
+ int priv; /* was value set by sysadmin? */
+ char *source; /* where option came from */
+};
+
+extern struct option_info auth_req_info;
+extern struct option_info connector_info;
+extern struct option_info disconnector_info;
+extern struct option_info welcomer_info;
+extern struct option_info devnam_info;