pppd/pppd.h

   1 /*
   2  * pppd.h - PPP daemon global declarations.
   3  *
   4  * Copyright (c) 1989 Carnegie Mellon University.
   5  * All rights reserved.
   6  *
   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.
  18  *
  19  * $Id: pppd.h,v 1.21 1998/03/26 04:46:08 paulus Exp $
  20  */
  21
  22 /*
  23  * TODO:
  24  */
  25
  26 #ifndef __PPPD_H__
  27 #define __PPPD_H__
  28
  29 #include <stdio.h>              /* for FILE */
  30 #include <sys/param.h>          /* for MAXPATHLEN and BSD4_4, if defined */
  31 #include <sys/types.h>          /* for u_int32_t, if defined */
  32 #include <sys/time.h>           /* for struct timeval */
  33 #include <net/ppp_defs.h>
  34
  35 #if __STDC__
  36 #include <stdarg.h>
  37 #define __V(x)  x
  38 #else
  39 #include <varargs.h>
  40 #define __V(x)  (va_alist) va_dcl
  41 #define const
  42 #endif
  43
  44 /*
  45  * Limits.
  46  */
  47
  48 #define NUM_PPP         1       /* One PPP interface supported (per process) */
  49 #define MAXWORDLEN      1024    /* max length of word in file (incl null) */
  50 #define MAXARGS         1       /* max # args to a command */
  51 #define MAXNAMELEN      256     /* max length of hostname or name for auth */
  52 #define MAXSECRETLEN    256     /* max length of password or secret */
  53
  54 /*
  55  * Global variables.
  56  */
  57
  58 extern int      hungup;         /* Physical layer has disconnected */
  59 extern int      ifunit;         /* Interface unit number */
  60 extern char     ifname[];       /* Interface name */
  61 extern int      ttyfd;          /* Serial device file descriptor */
  62 extern char     hostname[];     /* Our hostname */
  63 extern u_char   outpacket_buf[]; /* Buffer for outgoing packets */
  64 extern int      phase;          /* Current state of link - see values below */
  65 extern int      baud_rate;      /* Current link speed in bits/sec */
  66 extern char     *progname;      /* Name of this program */
  67 extern int      redirect_stderr;/* Connector's stderr should go to file */
  68 extern char     peer_authname[];/* Authenticated name of peer */
  69 extern int      privileged;     /* We were run by real-uid root */
  70 extern int      need_holdoff;   /* Need holdoff period after link terminates */
  71 extern char     **script_env;   /* Environment variables for scripts */
  72 extern int      detached;       /* Have detached from controlling tty */
  73
  74 /*
  75  * Variables set by command-line options.
  76  */
  77
  78 extern int      debug;          /* Debug flag */
  79 extern int      kdebugflag;     /* Tell kernel to print debug messages */
  80 extern int      default_device; /* Using /dev/tty or equivalent */
  81 extern char     devnam[];       /* Device name */
  82 extern int      crtscts;        /* Use hardware flow control */
  83 extern int      modem;          /* Use modem control lines */
  84 extern int      inspeed;        /* Input/Output speed requested */
  85 extern u_int32_t netmask;       /* IP netmask to set on interface */
  86 extern int      lockflag;       /* Create lock file to lock the serial dev */
  87 extern int      nodetach;       /* Don't detach from controlling tty */
  88 extern char     *connector;     /* Script to establish physical link */
  89 extern char     *disconnector;  /* Script to disestablish physical link */
  90 extern char     *welcomer;      /* Script to welcome client after connection */
  91 extern int      maxconnect;     /* Maximum connect time (seconds) */
  92 extern char     user[];         /* Our name for authenticating ourselves */
  93 extern char     passwd[];       /* Password for PAP */
  94 extern int      auth_required;  /* Peer is required to authenticate */
  95 extern int      proxyarp;       /* Set up proxy ARP entry for peer */
  96 extern int      persist;        /* Reopen link after it goes down */
  97 extern int      uselogin;       /* Use /etc/passwd for checking PAP */
  98 extern int      lcp_echo_interval; /* Interval between LCP echo-requests */
  99 extern int      lcp_echo_fails; /* Tolerance to unanswered echo-requests */
 100 extern char     our_name[];     /* Our name for authentication purposes */
 101 extern char     remote_name[];  /* Peer's name for authentication */
 102 extern int      explicit_remote;/* remote_name specified with remotename opt */
 103 extern int      usehostname;    /* Use hostname for our_name */
 104 extern int      disable_defaultip; /* Don't use hostname for default IP adrs */
 105 extern int      demand;         /* Do dial-on-demand */
 106 extern char     *ipparam;       /* Extra parameter for ip up/down scripts */
 107 extern int      cryptpap;       /* Others' PAP passwords are encrypted */
 108 extern int      idle_time_limit;/* Shut down link if idle for this long */
 109 extern int      holdoff;        /* Dead time before restarting */
 110 extern int      refuse_pap;     /* Don't wanna auth. ourselves with PAP */
 111 extern int      refuse_chap;    /* Don't wanna auth. ourselves with CHAP */
 112 #ifdef PPP_FILTER
 113 extern struct   bpf_program pass_filter;   /* Filter for pkts to pass */
 114 extern struct   bpf_program active_filter; /* Filter for link-active pkts */
 115 #endif
 116
 117
 118 #ifdef MSLANMAN
 119 extern int      ms_lanman;      /* Nonzero if use LanMan password instead of NT */
 120                                 /* Has meaning only with MS-CHAP challenges */
 121 #endif
 122
 123 /*
 124  * Values for phase.
 125  */
 126 #define PHASE_DEAD              0
 127 #define PHASE_INITIALIZE        1
 128 #define PHASE_DORMANT           2
 129 #define PHASE_ESTABLISH         3
 130 #define PHASE_AUTHENTICATE      4
 131 #define PHASE_CALLBACK          5
 132 #define PHASE_NETWORK           6
 133 #define PHASE_TERMINATE         7
 134 #define PHASE_HOLDOFF           8
 135
 136 /*
 137  * The following struct gives the addresses of procedures to call
 138  * for a particular protocol.
 139  */
 140 struct protent {
 141     u_short protocol;           /* PPP protocol number */
 142     /* Initialization procedure */
 143     void (*init) __P((int unit));
 144     /* Process a received packet */
 145     void (*input) __P((int unit, u_char *pkt, int len));
 146     /* Process a received protocol-reject */
 147     void (*protrej) __P((int unit));
 148     /* Lower layer has come up */
 149     void (*lowerup) __P((int unit));
 150     /* Lower layer has gone down */
 151     void (*lowerdown) __P((int unit));
 152     /* Open the protocol */
 153     void (*open) __P((int unit));
 154     /* Close the protocol */
 155     void (*close) __P((int unit, char *reason));
 156     /* Print a packet in readable form */
 157     int  (*printpkt) __P((u_char *pkt, int len,
 158                           void (*printer) __P((void *, char *, ...)),
 159                           void *arg));
 160     /* Process a received data packet */
 161     void (*datainput) __P((int unit, u_char *pkt, int len));
 162     int  enabled_flag;          /* 0 iff protocol is disabled */
 163     char *name;                 /* Text name of protocol */
 164     /* Check requested options, assign defaults */
 165     void (*check_options) __P((void));
 166     /* Configure interface for demand-dial */
 167     int  (*demand_conf) __P((int unit));
 168     /* Say whether to bring up link for this pkt */
 169     int  (*active_pkt) __P((u_char *pkt, int len));
 170 };
 171
 172 /* Table of pointers to supported protocols */
 173 extern struct protent *protocols[];
 174
 175 /*
 176  * Prototypes.
 177  */
 178
 179 /* Procedures exported from main.c. */
 180 void detach __P((void));        /* Detach from controlling tty */
 181 void die __P((int));            /* Cleanup and exit */
 182 void quit __P((void));          /* like die(1) */
 183 void novm __P((char *));        /* Say we ran out of memory, and die */
 184 void timeout __P((void (*func)(void *), void *arg, int t));
 185                                 /* Call func(arg) after t seconds */
 186 void untimeout __P((void (*func)(void *), void *arg));
 187                                 /* Cancel call to func(arg) */
 188 int run_program __P((char *prog, char **args, int must_exist));
 189                                 /* Run program prog with args in child */
 190 void demuxprotrej __P((int, int));
 191                                 /* Demultiplex a Protocol-Reject */
 192 void format_packet __P((u_char *, int, void (*) (void *, char *, ...),
 193                 void *));       /* Format a packet in human-readable form */
 194 void log_packet __P((u_char *, int, char *, int));
 195                                 /* Format a packet and log it with syslog */
 196 void print_string __P((char *, int,  void (*) (void *, char *, ...),
 197                 void *));       /* Format a string for output */
 198 int fmtmsg __P((char *, int, char *, ...));             /* sprintf++ */
 199 int vfmtmsg __P((char *, int, char *, va_list));        /* vsprintf++ */
 200 void script_setenv __P((char *, char *));       /* set script env var */
 201 void script_unsetenv __P((char *));             /* unset script env var */
 202
 203 /* Procedures exported from auth.c */
 204 void link_required __P((int));    /* we are starting to use the link */
 205 void link_terminated __P((int));  /* we are finished with the link */
 206 void link_down __P((int));        /* the LCP layer has left the Opened state */
 207 void link_established __P((int)); /* the link is up; authenticate now */
 208 void np_up __P((int, int));       /* a network protocol has come up */
 209 void np_down __P((int, int));     /* a network protocol has gone down */
 210 void np_finished __P((int, int)); /* a network protocol no longer needs link */
 211 void auth_peer_fail __P((int, int));
 212                                 /* peer failed to authenticate itself */
 213 void auth_peer_success __P((int, int, char *, int));
 214                                 /* peer successfully authenticated itself */
 215 void auth_withpeer_fail __P((int, int));
 216                                 /* we failed to authenticate ourselves */
 217 void auth_withpeer_success __P((int, int));
 218                                 /* we successfully authenticated ourselves */
 219 void auth_check_options __P((void));
 220                                 /* check authentication options supplied */
 221 void auth_reset __P((int));     /* check what secrets we have */
 222 int  check_passwd __P((int, char *, int, char *, int, char **, int *));
 223                                 /* Check peer-supplied username/password */
 224 int  get_secret __P((int, char *, char *, char *, int *, int));
 225                                 /* get "secret" for chap */
 226 int  auth_ip_addr __P((int, u_int32_t));
 227                                 /* check if IP address is authorized */
 228 int  bad_ip_adrs __P((u_int32_t));
 229                                 /* check if IP address is unreasonable */
 230 void check_access __P((FILE *, char *));
 231                                 /* check permissions on secrets file */
 232
 233 /* Procedures exported from demand.c */
 234 void demand_conf __P((void));   /* config interface(s) for demand-dial */
 235 void demand_block __P((void));  /* set all NPs to queue up packets */
 236 void demand_unblock __P((void)); /* set all NPs to pass packets */
 237 void demand_discard __P((void)); /* set all NPs to discard packets */
 238 void demand_rexmit __P((int));  /* retransmit saved frames for an NP */
 239 int  loop_chars __P((unsigned char *, int)); /* process chars from loopback */
 240 int  loop_frame __P((unsigned char *, int)); /* process frame from loopback */
 241
 242 /* Procedures exported from sys-*.c */
 243 void sys_init __P((void));      /* Do system-dependent initialization */
 244 void sys_cleanup __P((void));   /* Restore system state before exiting */
 245 void sys_check_options __P((void)); /* Check options specified */
 246 void sys_close __P((void));     /* Clean up in a child before execing */
 247 int  ppp_available __P((void)); /* Test whether ppp kernel support exists */
 248 void open_ppp_loopback __P((void)); /* Open loopback for demand-dialling */
 249 void establish_ppp __P((int));  /* Turn serial port into a ppp interface */
 250 void restore_loop __P((void));  /* Transfer ppp unit back to loopback */
 251 void disestablish_ppp __P((int)); /* Restore port to normal operation */
 252 void clean_check __P((void));   /* Check if line was 8-bit clean */
 253 void set_up_tty __P((int, int)); /* Set up port's speed, parameters, etc. */
 254 void restore_tty __P((int));    /* Restore port's original parameters */
 255 void setdtr __P((int, int));    /* Raise or lower port's DTR line */
 256 void output __P((int, u_char *, int)); /* Output a PPP packet */
 257 void wait_input __P((struct timeval *));
 258                                 /* Wait for input, with timeout */
 259 void wait_loop_output __P((struct timeval *));
 260                                 /* Wait for pkt from loopback, with timeout */
 261 void wait_time __P((struct timeval *)); /* Wait for given length of time */
 262 int  read_packet __P((u_char *)); /* Read PPP packet */
 263 int  get_loop_output __P((void)); /* Read pkts from loopback */
 264 void ppp_send_config __P((int, int, u_int32_t, int, int));
 265                                 /* Configure i/f transmit parameters */
 266 void ppp_set_xaccm __P((int, ext_accm));
 267                                 /* Set extended transmit ACCM */
 268 void ppp_recv_config __P((int, int, u_int32_t, int, int));
 269                                 /* Configure i/f receive parameters */
 270 int  ccp_test __P((int, u_char *, int, int));
 271                                 /* Test support for compression scheme */
 272 void ccp_flags_set __P((int, int, int));
 273                                 /* Set kernel CCP state */
 274 int  ccp_fatal_error __P((int)); /* Test for fatal decomp error in kernel */
 275 int  get_idle_time __P((int, struct ppp_idle *));
 276                                 /* Find out how long link has been idle */
 277 int  sifvjcomp __P((int, int, int, int));
 278                                 /* Configure VJ TCP header compression */
 279 int  sifup __P((int));          /* Configure i/f up (for IP) */
 280 int  sifnpmode __P((int u, int proto, enum NPmode mode));
 281                                 /* Set mode for handling packets for proto */
 282 int  sifdown __P((int));        /* Configure i/f down (for IP) */
 283 int  sifaddr __P((int, u_int32_t, u_int32_t, u_int32_t));
 284                                 /* Configure IP addresses for i/f */
 285 int  cifaddr __P((int, u_int32_t, u_int32_t));
 286                                 /* Reset i/f IP addresses */
 287 int  sifdefaultroute __P((int, u_int32_t, u_int32_t));
 288                                 /* Create default route through i/f */
 289 int  cifdefaultroute __P((int, u_int32_t, u_int32_t));
 290                                 /* Delete default route through i/f */
 291 int  sifproxyarp __P((int, u_int32_t));
 292                                 /* Add proxy ARP entry for peer */
 293 int  cifproxyarp __P((int, u_int32_t));
 294                                 /* Delete proxy ARP entry for peer */
 295 u_int32_t GetMask __P((u_int32_t)); /* Get appropriate netmask for address */
 296 int  lock __P((char *));        /* Create lock file for device */
 297 void unlock __P((void));        /* Delete previously-created lock file */
 298 int  daemon __P((int, int));    /* Detach us from terminal session */
 299 void logwtmp __P((const char *, const char *, const char *));
 300                                 /* Write entry to wtmp file */
 301 int  get_host_seed __P((void)); /* Get host-dependent random number seed */
 302 #ifdef PPP_FILTER
 303 int  set_filters __P((struct bpf_program *pass, struct bpf_program *active));
 304                                 /* Set filter programs in kernel */
 305 #endif
 306
 307 /* Procedures exported from options.c */
 308 int  parse_args __P((int argc, char **argv));
 309                                 /* Parse options from arguments given */
 310 void usage __P((void));         /* Print a usage message */
 311 int  options_from_file __P((char *filename, int must_exist, int check_prot,
 312                             int privileged));
 313                                 /* Parse options from an options file */
 314 int  options_from_user __P((void)); /* Parse options from user's .ppprc */
 315 int  options_for_tty __P((void)); /* Parse options from /etc/ppp/options.tty */
 316 void scan_args __P((int argc, char **argv));
 317                                 /* Look for tty name in command-line args */
 318 int  getword __P((FILE *f, char *word, int *newlinep, char *filename));
 319                                 /* Read a word from a file */
 320 void option_error __P((char *fmt, ...));
 321                                 /* Print an error message about an option */
 322
 323 /*
 324  * This structure is used to store information about certain
 325  * options, such as where the option value came from (/etc/ppp/options,
 326  * command line, etc.) and whether it came from a privileged source.
 327  */
 328
 329 struct option_info {
 330     int     priv;               /* was value set by sysadmin? */
 331     char    *source;            /* where option came from */
 332 };
 333
 334 extern struct option_info auth_req_info;
 335 extern struct option_info connector_info;
 336 extern struct option_info disconnector_info;
 337 extern struct option_info welcomer_info;
 338 extern struct option_info devnam_info;
 339
 340 /*
 341  * Inline versions of get/put char/short/long.
 342  * Pointer is advanced; we assume that both arguments
 343  * are lvalues and will already be in registers.
 344  * cp MUST be u_char *.
 345  */
 346 #define GETCHAR(c, cp) { \
 347         (c) = *(cp)++; \
 348 }
 349 #define PUTCHAR(c, cp) { \
 350         *(cp)++ = (u_char) (c); \
 351 }
 352
 353
 354 #define GETSHORT(s, cp) { \
 355         (s) = *(cp)++ << 8; \
 356         (s) |= *(cp)++; \
 357 }
 358 #define PUTSHORT(s, cp) { \
 359         *(cp)++ = (u_char) ((s) >> 8); \
 360         *(cp)++ = (u_char) (s); \
 361 }
 362
 363 #define GETLONG(l, cp) { \
 364         (l) = *(cp)++ << 8; \
 365         (l) |= *(cp)++; (l) <<= 8; \
 366         (l) |= *(cp)++; (l) <<= 8; \
 367         (l) |= *(cp)++; \
 368 }
 369 #define PUTLONG(l, cp) { \
 370         *(cp)++ = (u_char) ((l) >> 24); \
 371         *(cp)++ = (u_char) ((l) >> 16); \
 372         *(cp)++ = (u_char) ((l) >> 8); \
 373         *(cp)++ = (u_char) (l); \
 374 }
 375
 376 #define INCPTR(n, cp)   ((cp) += (n))
 377 #define DECPTR(n, cp)   ((cp) -= (n))
 378
 379 #undef  FALSE
 380 #define FALSE   0
 381 #undef  TRUE
 382 #define TRUE    1
 383
 384 /*
 385  * System dependent definitions for user-level 4.3BSD UNIX implementation.
 386  */
 387
 388 #define DEMUXPROTREJ(u, p)      demuxprotrej(u, p)
 389
 390 #define TIMEOUT(r, f, t)        timeout((r), (f), (t))
 391 #define UNTIMEOUT(r, f)         untimeout((r), (f))
 392
 393 #define BCOPY(s, d, l)          memcpy(d, s, l)
 394 #define BZERO(s, n)             memset(s, 0, n)
 395 #define EXIT(u)                 quit()
 396
 397 #define PRINTMSG(m, l)  { m[l] = '\0'; syslog(LOG_INFO, "Remote message: %s", m); }
 398
 399 /*
 400  * MAKEHEADER - Add Header fields to a packet.
 401  */
 402 #define MAKEHEADER(p, t) { \
 403     PUTCHAR(PPP_ALLSTATIONS, p); \
 404     PUTCHAR(PPP_UI, p); \
 405     PUTSHORT(t, p); }
 406
 407
 408 #ifdef DEBUGALL
 409 #define DEBUGMAIN       1
 410 #define DEBUGFSM        1
 411 #define DEBUGLCP        1
 412 #define DEBUGIPCP       1
 413 #define DEBUGUPAP       1
 414 #define DEBUGCHAP       1
 415 #endif
 416
 417 #ifndef LOG_PPP                 /* we use LOG_LOCAL2 for syslog by default */
 418 #if defined(DEBUGMAIN) || defined(DEBUGFSM) || defined(DEBUGSYS) \
 419   || defined(DEBUGLCP) || defined(DEBUGIPCP) || defined(DEBUGUPAP) \
 420   || defined(DEBUGCHAP) || defined(DEBUG)
 421 #define LOG_PPP LOG_LOCAL2
 422 #else
 423 #define LOG_PPP LOG_DAEMON
 424 #endif
 425 #endif /* LOG_PPP */
 426
 427 #ifdef DEBUGMAIN
 428 #define MAINDEBUG(x)    if (debug) syslog x
 429 #else
 430 #define MAINDEBUG(x)
 431 #endif
 432
 433 #ifdef DEBUGSYS
 434 #define SYSDEBUG(x)     if (debug) syslog x
 435 #else
 436 #define SYSDEBUG(x)
 437 #endif
 438
 439 #ifdef DEBUGFSM
 440 #define FSMDEBUG(x)     if (debug) syslog x
 441 #else
 442 #define FSMDEBUG(x)
 443 #endif
 444
 445 #ifdef DEBUGLCP
 446 #define LCPDEBUG(x)     if (debug) syslog x
 447 #else
 448 #define LCPDEBUG(x)
 449 #endif
 450
 451 #ifdef DEBUGIPCP
 452 #define IPCPDEBUG(x)    if (debug) syslog x
 453 #else
 454 #define IPCPDEBUG(x)
 455 #endif
 456
 457 #ifdef DEBUGUPAP
 458 #define UPAPDEBUG(x)    if (debug) syslog x
 459 #else
 460 #define UPAPDEBUG(x)
 461 #endif
 462
 463 #ifdef DEBUGCHAP
 464 #define CHAPDEBUG(x)    if (debug) syslog x
 465 #else
 466 #define CHAPDEBUG(x)
 467 #endif
 468
 469 #ifdef DEBUGIPXCP
 470 #define IPXCPDEBUG(x)   if (debug) syslog x
 471 #else
 472 #define IPXCPDEBUG(x)
 473 #endif
 474
 475 #ifndef SIGTYPE
 476 #if defined(sun) || defined(SYSV) || defined(POSIX_SOURCE)
 477 #define SIGTYPE void
 478 #else
 479 #define SIGTYPE int
 480 #endif /* defined(sun) || defined(SYSV) || defined(POSIX_SOURCE) */
 481 #endif /* SIGTYPE */
 482
 483 #ifndef MIN
 484 #define MIN(a, b)       ((a) < (b)? (a): (b))
 485 #endif
 486 #ifndef MAX
 487 #define MAX(a, b)       ((a) > (b)? (a): (b))
 488 #endif
 489
 490 #endif /* __PPP_H__ */