2 * pppd.h - PPP daemon global declarations.
4 * Copyright (c) 1989 Carnegie Mellon University.
7 * Redistribution and use in source and binary forms are permitted
8 * provided that the above copyright notice and this paragraph are
9 * duplicated in all such forms and that any documentation,
10 * advertising materials, and other materials related to such
11 * distribution and use acknowledge that the software was developed
12 * by Carnegie Mellon University. The name of the
13 * University may not be used to endorse or promote products derived
14 * from this software without specific prior written permission.
15 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
17 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
19 * $Id: pppd.h,v 1.48 1999/09/11 12:08:59 paulus Exp $
29 #include <stdio.h> /* for FILE */
30 #include <limits.h> /* for NGROUPS_MAX */
31 #include <sys/param.h> /* for MAXPATHLEN and BSD4_4, if defined */
32 #include <sys/types.h> /* for u_int32_t, if defined */
33 #include <sys/time.h> /* for struct timeval */
34 #include <net/ppp_defs.h>
41 #define __V(x) (va_alist) va_dcl
54 #define NUM_PPP 1 /* One PPP interface supported (per process) */
55 #define MAXWORDLEN 1024 /* max length of word in file (incl null) */
56 #define MAXARGS 1 /* max # args to a command */
57 #define MAXNAMELEN 256 /* max length of hostname or name for auth */
58 #define MAXSECRETLEN 256 /* max length of password or secret */
61 * Option descriptor structure.
64 typedef unsigned char bool;
76 char *name; /* name of the option */
86 /* Values for flags */
87 #define OPT_VALUE 0xff /* mask for presupplied value */
88 #define OPT_HEX 0x100 /* int option is in hex */
89 #define OPT_NOARG 0x200 /* option doesn't take argument */
90 #define OPT_OR 0x400 /* OR in argument to value */
91 #define OPT_INC 0x800 /* increment value */
92 #define OPT_PRIV 0x1000 /* privileged option */
93 #define OPT_STATIC 0x2000 /* string option goes into static array */
94 #define OPT_LLIMIT 0x4000 /* check value against lower limit */
95 #define OPT_ULIMIT 0x8000 /* check value against upper limit */
96 #define OPT_LIMITS (OPT_LLIMIT|OPT_ULIMIT)
97 #define OPT_ZEROOK 0x10000 /* 0 value is OK even if not within limits */
98 #define OPT_NOINCR 0x20000 /* value mustn't be increased */
99 #define OPT_ZEROINF 0x40000 /* with OPT_NOINCR, 0 == infinity */
100 #define OPT_A2INFO 0x100000 /* addr2 -> option_info to update */
101 #define OPT_A2COPY 0x200000 /* addr2 -> second location to rcv value */
102 #define OPT_ENABLE 0x400000 /* use *addr2 as enable for option */
103 #define OPT_PRIVFIX 0x800000 /* can't be overridden if noauth */
104 #define OPT_PREPASS 0x1000000 /* do this opt in pre-pass to find device */
105 #define OPT_INITONLY 0x2000000 /* option can only be set in init phase */
106 #define OPT_DEVEQUIV 0x4000000 /* equiv to device name */
107 #define OPT_DEVNAM (OPT_PREPASS | OPT_INITONLY | OPT_DEVEQUIV)
109 #define OPT_VAL(x) ((x) & OPT_VALUE)
112 #define GIDSET_TYPE gid_t
115 /* Structure representing a list of permitted IP addresses. */
116 struct permitted_ip {
117 int permit; /* 1 = permit, 0 = forbid */
118 u_int32_t base; /* match if (addr & mask) == base */
119 u_int32_t mask; /* base and mask are in network byte order */
123 * Unfortunately, the linux kernel driver uses a different structure
124 * for statistics from the rest of the ports.
125 * This structure serves as a common representation for the bits
129 unsigned int bytes_in;
130 unsigned int bytes_out;
133 /* Used for storing a sequence of words. Usually malloced. */
135 struct wordlist *next;
143 extern int hungup; /* Physical layer has disconnected */
144 extern int ifunit; /* Interface unit number */
145 extern char ifname[]; /* Interface name */
146 extern int ttyfd; /* Serial device file descriptor */
147 extern char hostname[]; /* Our hostname */
148 extern u_char outpacket_buf[]; /* Buffer for outgoing packets */
149 extern int phase; /* Current state of link - see values below */
150 extern int baud_rate; /* Current link speed in bits/sec */
151 extern char *progname; /* Name of this program */
152 extern int redirect_stderr;/* Connector's stderr should go to file */
153 extern char peer_authname[];/* Authenticated name of peer */
154 extern int privileged; /* We were run by real-uid root */
155 extern int need_holdoff; /* Need holdoff period after link terminates */
156 extern char **script_env; /* Environment variables for scripts */
157 extern int detached; /* Have detached from controlling tty */
158 extern GIDSET_TYPE groups[NGROUPS_MAX]; /* groups the user is in */
159 extern int ngroups; /* How many groups valid in groups */
160 extern struct pppd_stats link_stats; /* byte/packet counts etc. for link */
161 extern int link_stats_valid; /* set if link_stats is valid */
162 extern int link_connect_time; /* time the link was up for */
163 extern int using_pty; /* using pty as device (notty or pty opt.) */
164 extern int log_to_fd; /* logging to this fd as well as syslog */
165 extern char *no_ppp_msg; /* message to print if ppp not in kernel */
166 extern volatile int status; /* exit status for pppd */
167 extern int devnam_fixed; /* can no longer change devnam */
168 extern int unsuccess; /* # unsuccessful connection attempts */
171 * Variables set by command-line options.
174 extern int debug; /* Debug flag */
175 extern int kdebugflag; /* Tell kernel to print debug messages */
176 extern int default_device; /* Using /dev/tty or equivalent */
177 extern char devnam[MAXPATHLEN]; /* Device name */
178 extern int crtscts; /* Use hardware flow control */
179 extern bool modem; /* Use modem control lines */
180 extern int inspeed; /* Input/Output speed requested */
181 extern u_int32_t netmask; /* IP netmask to set on interface */
182 extern bool lockflag; /* Create lock file to lock the serial dev */
183 extern bool nodetach; /* Don't detach from controlling tty */
184 extern bool updetach; /* Detach from controlling tty when link up */
185 extern char *initializer; /* Script to initialize physical link */
186 extern char *connector; /* Script to establish physical link */
187 extern char *disconnector; /* Script to disestablish physical link */
188 extern char *welcomer; /* Script to welcome client after connection */
189 extern char *ptycommand; /* Command to run on other side of pty */
190 extern int maxconnect; /* Maximum connect time (seconds) */
191 extern char user[MAXNAMELEN];/* Our name for authenticating ourselves */
192 extern char passwd[MAXSECRETLEN]; /* Password for PAP or CHAP */
193 extern bool auth_required; /* Peer is required to authenticate */
194 extern bool persist; /* Reopen link after it goes down */
195 extern bool uselogin; /* Use /etc/passwd for checking PAP */
196 extern char our_name[MAXNAMELEN];/* Our name for authentication purposes */
197 extern char remote_name[MAXNAMELEN]; /* Peer's name for authentication */
198 extern bool explicit_remote;/* remote_name specified with remotename opt */
199 extern bool demand; /* Do dial-on-demand */
200 extern char *ipparam; /* Extra parameter for ip up/down scripts */
201 extern bool cryptpap; /* Others' PAP passwords are encrypted */
202 extern int idle_time_limit;/* Shut down link if idle for this long */
203 extern int holdoff; /* Dead time before restarting */
204 extern bool holdoff_specified; /* true if user gave a holdoff value */
205 extern bool notty; /* Stdin/out is not a tty */
206 extern char *record_file; /* File to record chars sent/received */
207 extern bool sync_serial; /* Device is synchronous serial device */
208 extern int maxfail; /* Max # of unsuccessful connection attempts */
209 extern char linkname[MAXPATHLEN]; /* logical name for link */
210 extern bool tune_kernel; /* May alter kernel settings as necessary */
213 extern struct bpf_program pass_filter; /* Filter for pkts to pass */
214 extern struct bpf_program active_filter; /* Filter for link-active pkts */
218 extern bool ms_lanman; /* Use LanMan password instead of NT */
219 /* Has meaning only with MS-CHAP challenges */
222 extern char *current_option; /* the name of the option being parsed */
223 extern int privileged_option; /* set iff the current option came from root */
224 extern char *option_source; /* string saying where the option came from */
230 #define PHASE_INITIALIZE 1
231 #define PHASE_SERIALCONN 2
232 #define PHASE_DORMANT 3
233 #define PHASE_ESTABLISH 4
234 #define PHASE_AUTHENTICATE 5
235 #define PHASE_CALLBACK 6
236 #define PHASE_NETWORK 7
237 #define PHASE_RUNNING 8
238 #define PHASE_TERMINATE 9
239 #define PHASE_DISCONNECT 10
240 #define PHASE_HOLDOFF 11
243 * The following struct gives the addresses of procedures to call
244 * for a particular protocol.
247 u_short protocol; /* PPP protocol number */
248 /* Initialization procedure */
249 void (*init) __P((int unit));
250 /* Process a received packet */
251 void (*input) __P((int unit, u_char *pkt, int len));
252 /* Process a received protocol-reject */
253 void (*protrej) __P((int unit));
254 /* Lower layer has come up */
255 void (*lowerup) __P((int unit));
256 /* Lower layer has gone down */
257 void (*lowerdown) __P((int unit));
258 /* Open the protocol */
259 void (*open) __P((int unit));
260 /* Close the protocol */
261 void (*close) __P((int unit, char *reason));
262 /* Print a packet in readable form */
263 int (*printpkt) __P((u_char *pkt, int len,
264 void (*printer) __P((void *, char *, ...)),
266 /* Process a received data packet */
267 void (*datainput) __P((int unit, u_char *pkt, int len));
268 bool enabled_flag; /* 0 iff protocol is disabled */
269 char *name; /* Text name of protocol */
270 char *data_name; /* Text name of corresponding data protocol */
271 option_t *options; /* List of command-line options */
272 /* Check requested options, assign defaults */
273 void (*check_options) __P((void));
274 /* Configure interface for demand-dial */
275 int (*demand_conf) __P((int unit));
276 /* Say whether to bring up link for this pkt */
277 int (*active_pkt) __P((u_char *pkt, int len));
280 /* Table of pointers to supported protocols */
281 extern struct protent *protocols[];
287 /* Procedures exported from main.c. */
288 void detach __P((void)); /* Detach from controlling tty */
289 void die __P((int)); /* Cleanup and exit */
290 void quit __P((void)); /* like die(1) */
291 void novm __P((char *)); /* Say we ran out of memory, and die */
292 void timeout __P((void (*func)(void *), void *arg, int t));
293 /* Call func(arg) after t seconds */
294 void untimeout __P((void (*func)(void *), void *arg));
295 /* Cancel call to func(arg) */
296 pid_t run_program __P((char *prog, char **args, int must_exist,
297 void (*done)(void *), void *arg));
298 /* Run program prog with args in child */
299 void reopen_log __P((void)); /* (re)open the connection to syslog */
300 void update_link_stats __P((int)); /* Get stats at link termination */
301 void script_setenv __P((char *, char *)); /* set script env var */
302 void script_unsetenv __P((char *)); /* unset script env var */
303 void new_phase __P((int)); /* signal start of new phase */
305 /* Procedures exported from utils.c. */
306 void log_packet __P((u_char *, int, char *, int));
307 /* Format a packet and log it with syslog */
308 void print_string __P((char *, int, void (*) (void *, char *, ...),
309 void *)); /* Format a string for output */
310 int slprintf __P((char *, int, char *, ...)); /* sprintf++ */
311 int vslprintf __P((char *, int, char *, va_list)); /* vsprintf++ */
312 size_t strlcpy __P((char *, const char *, size_t)); /* safe strcpy */
313 size_t strlcat __P((char *, const char *, size_t)); /* safe strncpy */
314 void dbglog __P((char *, ...)); /* log a debug message */
315 void info __P((char *, ...)); /* log an informational message */
316 void notice __P((char *, ...)); /* log a notice-level message */
317 void warn __P((char *, ...)); /* log a warning message */
318 void error __P((char *, ...)); /* log an error message */
319 void fatal __P((char *, ...)); /* log an error message and die(1) */
321 /* Procedures exported from auth.c */
322 void link_required __P((int)); /* we are starting to use the link */
323 void link_terminated __P((int)); /* we are finished with the link */
324 void link_down __P((int)); /* the LCP layer has left the Opened state */
325 void link_established __P((int)); /* the link is up; authenticate now */
326 void start_networks __P((void)); /* start all the network control protos */
327 void np_up __P((int, int)); /* a network protocol has come up */
328 void np_down __P((int, int)); /* a network protocol has gone down */
329 void np_finished __P((int, int)); /* a network protocol no longer needs link */
330 void auth_peer_fail __P((int, int));
331 /* peer failed to authenticate itself */
332 void auth_peer_success __P((int, int, char *, int));
333 /* peer successfully authenticated itself */
334 void auth_withpeer_fail __P((int, int));
335 /* we failed to authenticate ourselves */
336 void auth_withpeer_success __P((int, int));
337 /* we successfully authenticated ourselves */
338 void auth_check_options __P((void));
339 /* check authentication options supplied */
340 void auth_reset __P((int)); /* check what secrets we have */
341 int check_passwd __P((int, char *, int, char *, int, char **));
342 /* Check peer-supplied username/password */
343 int get_secret __P((int, char *, char *, char *, int *, int));
344 /* get "secret" for chap */
345 int auth_ip_addr __P((int, u_int32_t));
346 /* check if IP address is authorized */
347 int bad_ip_adrs __P((u_int32_t));
348 /* check if IP address is unreasonable */
350 /* Procedures exported from demand.c */
351 void demand_conf __P((void)); /* config interface(s) for demand-dial */
352 void demand_block __P((void)); /* set all NPs to queue up packets */
353 void demand_unblock __P((void)); /* set all NPs to pass packets */
354 void demand_discard __P((void)); /* set all NPs to discard packets */
355 void demand_rexmit __P((int)); /* retransmit saved frames for an NP */
356 int loop_chars __P((unsigned char *, int)); /* process chars from loopback */
357 int loop_frame __P((unsigned char *, int)); /* should we bring link up? */
359 /* Procedures exported from sys-*.c */
360 void sys_init __P((void)); /* Do system-dependent initialization */
361 void sys_cleanup __P((void)); /* Restore system state before exiting */
362 int sys_check_options __P((void)); /* Check options specified */
363 void sys_close __P((void)); /* Clean up in a child before execing */
364 int ppp_available __P((void)); /* Test whether ppp kernel support exists */
365 int get_pty __P((int *, int *, char *, int)); /* Get pty master/slave */
366 int open_ppp_loopback __P((void)); /* Open loopback for demand-dialling */
367 int establish_ppp __P((int)); /* Turn serial port into a ppp interface */
368 void restore_loop __P((void)); /* Transfer ppp unit back to loopback */
369 void disestablish_ppp __P((int)); /* Restore port to normal operation */
370 void clean_check __P((void)); /* Check if line was 8-bit clean */
371 void set_up_tty __P((int, int)); /* Set up port's speed, parameters, etc. */
372 void restore_tty __P((int)); /* Restore port's original parameters */
373 void setdtr __P((int, int)); /* Raise or lower port's DTR line */
374 void output __P((int, u_char *, int)); /* Output a PPP packet */
375 void wait_input __P((struct timeval *));
376 /* Wait for input, with timeout */
377 void add_fd __P((int)); /* Add fd to set to wait for */
378 void remove_fd __P((int)); /* Remove fd from set to wait for */
379 int read_packet __P((u_char *)); /* Read PPP packet */
380 int get_loop_output __P((void)); /* Read pkts from loopback */
381 void ppp_send_config __P((int, int, u_int32_t, int, int));
382 /* Configure i/f transmit parameters */
383 void ppp_set_xaccm __P((int, ext_accm));
384 /* Set extended transmit ACCM */
385 void ppp_recv_config __P((int, int, u_int32_t, int, int));
386 /* Configure i/f receive parameters */
387 int ccp_test __P((int, u_char *, int, int));
388 /* Test support for compression scheme */
389 void ccp_flags_set __P((int, int, int));
390 /* Set kernel CCP state */
391 int ccp_fatal_error __P((int)); /* Test for fatal decomp error in kernel */
392 int get_idle_time __P((int, struct ppp_idle *));
393 /* Find out how long link has been idle */
394 int get_ppp_stats __P((int, struct pppd_stats *));
395 /* Return link statistics */
396 int sifvjcomp __P((int, int, int, int));
397 /* Configure VJ TCP header compression */
398 int sifup __P((int)); /* Configure i/f up for one protocol */
399 int sifnpmode __P((int u, int proto, enum NPmode mode));
400 /* Set mode for handling packets for proto */
401 int sifdown __P((int)); /* Configure i/f down for one protocol */
402 int sifaddr __P((int, u_int32_t, u_int32_t, u_int32_t));
403 /* Configure IPv4 addresses for i/f */
404 int cifaddr __P((int, u_int32_t, u_int32_t));
405 /* Reset i/f IP addresses */
407 int sif6addr __P((int, eui64_t, eui64_t));
408 /* Configure IPv6 addresses for i/f */
409 int cif6addr __P((int, eui64_t, eui64_t));
410 /* Remove an IPv6 address from i/f */
412 int sifdefaultroute __P((int, u_int32_t, u_int32_t));
413 /* Create default route through i/f */
414 int cifdefaultroute __P((int, u_int32_t, u_int32_t));
415 /* Delete default route through i/f */
416 int sifproxyarp __P((int, u_int32_t));
417 /* Add proxy ARP entry for peer */
418 int cifproxyarp __P((int, u_int32_t));
419 /* Delete proxy ARP entry for peer */
420 u_int32_t GetMask __P((u_int32_t)); /* Get appropriate netmask for address */
421 int lock __P((char *)); /* Create lock file for device */
422 int relock __P((int)); /* Rewrite lock file with new pid */
423 void unlock __P((void)); /* Delete previously-created lock file */
424 void logwtmp __P((const char *, const char *, const char *));
425 /* Write entry to wtmp file */
426 int get_host_seed __P((void)); /* Get host-dependent random number seed */
427 int have_route_to __P((u_int32_t)); /* Check if route to addr exists */
429 int set_filters __P((struct bpf_program *pass, struct bpf_program *active));
430 /* Set filter programs in kernel */
433 int sipxfaddr __P((int, unsigned long, unsigned char *));
434 int cipxfaddr __P((int));
437 /* Procedures exported from options.c */
438 int parse_args __P((int argc, char **argv));
439 /* Parse options from arguments given */
440 int options_from_file __P((char *filename, int must_exist, int check_prot,
442 /* Parse options from an options file */
443 int options_from_user __P((void)); /* Parse options from user's .ppprc */
444 int options_for_tty __P((void)); /* Parse options from /etc/ppp/options.tty */
445 int options_from_list __P((struct wordlist *, int privileged));
446 /* Parse options from a wordlist */
447 int getword __P((FILE *f, char *word, int *newlinep, char *filename));
448 /* Read a word from a file */
449 void option_error __P((char *fmt, ...));
450 /* Print an error message about an option */
451 int int_option __P((char *, int *));
452 /* Simplified number_option for decimal ints */
453 void add_options __P((option_t *)); /* Add extra options */
456 * This structure is used to store information about certain
457 * options, such as where the option value came from (/etc/ppp/options,
458 * command line, etc.) and whether it came from a privileged source.
462 int priv; /* was value set by sysadmin? */
463 char *source; /* where option came from */
466 extern struct option_info devnam_info;
467 extern struct option_info initializer_info;
468 extern struct option_info connector_info;
469 extern struct option_info disconnector_info;
470 extern struct option_info welcomer_info;
471 extern struct option_info ptycommand_info;
474 * Hooks to enable plugins to change various things.
476 extern int (*new_phase_hook) __P((int));
477 extern int (*idle_time_hook) __P((struct ppp_idle *));
478 extern int (*holdoff_hook) __P((void));
479 extern int (*pap_check_hook) __P((void));
480 extern int (*pap_auth_hook) __P((char *user, char *passwd, char **msgp,
481 struct wordlist **paddrs,
482 struct wordlist **popts));
483 extern int (*pap_passwd_hook) __P((char *user, char *passwd));
486 * Inline versions of get/put char/short/long.
487 * Pointer is advanced; we assume that both arguments
488 * are lvalues and will already be in registers.
489 * cp MUST be u_char *.
491 #define GETCHAR(c, cp) { \
494 #define PUTCHAR(c, cp) { \
495 *(cp)++ = (u_char) (c); \
499 #define GETSHORT(s, cp) { \
500 (s) = *(cp)++ << 8; \
503 #define PUTSHORT(s, cp) { \
504 *(cp)++ = (u_char) ((s) >> 8); \
505 *(cp)++ = (u_char) (s); \
508 #define GETLONG(l, cp) { \
509 (l) = *(cp)++ << 8; \
510 (l) |= *(cp)++; (l) <<= 8; \
511 (l) |= *(cp)++; (l) <<= 8; \
514 #define PUTLONG(l, cp) { \
515 *(cp)++ = (u_char) ((l) >> 24); \
516 *(cp)++ = (u_char) ((l) >> 16); \
517 *(cp)++ = (u_char) ((l) >> 8); \
518 *(cp)++ = (u_char) (l); \
521 #define INCPTR(n, cp) ((cp) += (n))
522 #define DECPTR(n, cp) ((cp) -= (n))
525 * System dependent definitions for user-level 4.3BSD UNIX implementation.
528 #define TIMEOUT(r, f, t) timeout((r), (f), (t))
529 #define UNTIMEOUT(r, f) untimeout((r), (f))
531 #define BCOPY(s, d, l) memcpy(d, s, l)
532 #define BZERO(s, n) memset(s, 0, n)
534 #define PRINTMSG(m, l) { info("Remote message: %0.*v", l, m); }
537 * MAKEHEADER - Add Header fields to a packet.
539 #define MAKEHEADER(p, t) { \
540 PUTCHAR(PPP_ALLSTATIONS, p); \
541 PUTCHAR(PPP_UI, p); \
545 * Exit status values.
548 #define EXIT_FATAL_ERROR 1
549 #define EXIT_OPTION_ERROR 2
550 #define EXIT_NOT_ROOT 3
551 #define EXIT_NO_KERNEL_SUPPORT 4
552 #define EXIT_USER_REQUEST 5
553 #define EXIT_LOCK_FAILED 6
554 #define EXIT_OPEN_FAILED 7
555 #define EXIT_CONNECT_FAILED 8
556 #define EXIT_PTYCMD_FAILED 9
557 #define EXIT_NEGOTIATION_FAILED 10
558 #define EXIT_PEER_AUTH_FAILED 11
559 #define EXIT_IDLE_TIMEOUT 12
560 #define EXIT_CONNECT_TIME 13
561 #define EXIT_CALLBACK 14
562 #define EXIT_PEER_DEAD 15
563 #define EXIT_HANGUP 16
564 #define EXIT_LOOPBACK 17
565 #define EXIT_INIT_FAILED 18
566 #define EXIT_AUTH_TOPEER_FAILED 19
569 * Debug macros. Slightly useful for finding bugs in pppd, not particularly
570 * useful for finding out why your connection isn't being established.
577 #define DEBUGIPV6CP 1
582 #ifndef LOG_PPP /* we use LOG_LOCAL2 for syslog by default */
583 #if defined(DEBUGMAIN) || defined(DEBUGFSM) || defined(DEBUGSYS) \
584 || defined(DEBUGLCP) || defined(DEBUGIPCP) || defined(DEBUGUPAP) \
585 || defined(DEBUGCHAP) || defined(DEBUG) || defined(DEBUGIPV6CP)
586 #define LOG_PPP LOG_LOCAL2
588 #define LOG_PPP LOG_DAEMON
593 #define MAINDEBUG(x) if (debug) dbglog x
599 #define SYSDEBUG(x) if (debug) dbglog x
605 #define FSMDEBUG(x) if (debug) dbglog x
611 #define LCPDEBUG(x) if (debug) dbglog x
617 #define IPCPDEBUG(x) if (debug) dbglog x
623 #define IPV6CPDEBUG(x) if (debug) dbglog x
625 #define IPV6CPDEBUG(x)
629 #define UPAPDEBUG(x) if (debug) dbglog x
635 #define CHAPDEBUG(x) if (debug) dbglog x
641 #define IPXCPDEBUG(x) if (debug) dbglog x
643 #define IPXCPDEBUG(x)
647 #if defined(sun) || defined(SYSV) || defined(POSIX_SOURCE)
651 #endif /* defined(sun) || defined(SYSV) || defined(POSIX_SOURCE) */
655 #define MIN(a, b) ((a) < (b)? (a): (b))
658 #define MAX(a, b) ((a) > (b)? (a): (b))
661 #endif /* __PPP_H__ */