1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452
|
/*
* diald.h - Main header file.
*
* Copyright (c) 1994, 1995, 1996 Eric Schenk.
* All rights reserved. Please see the file LICENSE which should be
* distributed with this software for terms of use.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <unistd.h>
#include <strings.h>
#include <dirent.h>
#include <fcntl.h>
#include <ctype.h>
#include <errno.h>
#include <syslog.h>
#include <signal.h>
#include <time.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/termios.h>
/* #include <sys/bitypes.h> */
#include <net/if.h>
#include <netdb.h>
/*
#include <netinet/ip_tcp.h>
#include <netinet/ip_udp.h>
#include <netinet/ip_icmp.h>
#include <netinet/ip.h>
*/
#include <netinet/in.h>
/* #include <asm/byteorder.h> */
/* Shut up gcc about a redefinition that is harmless */
#undef LITTLE_ENDIAN
#ifndef __GLIBC__
#include <linux/ip.h>
#include <linux/in.h>
#include <linux/udp.h>
#include <linux/tcp.h>
#include <linux/icmp.h>
#else
#include <netinet/ip.h>
#include <netinet/udp.h>
#include <netinet/tcp.h>
#endif
#include <arpa/inet.h>
/* Hmm. Should there be a netinet pointer to these??? */
#ifndef __GLIBC__
#include <linux/if_ether.h>
#include <linux/if_slip.h>
#else
#include <net/ethernet.h>
#endif
#include <linux/version.h>
/* This only exists in kernels >= 1.3.75 */
#if LINUX_VERSION_CODE >= 66379
#define HAS_SOCKADDR_PKT
#include <linux/if_packet.h>
#define SOCKADDR sockaddr_pkt
#else
#include <linux/socket.h>
#define SOCKADDR sockaddr
#endif
#include "config.h"
#include "fsm.h"
#include "timer.h"
#include "firewall.h"
#include "bufio.h"
#define LOG_DDIAL LOG_LOCAL2
/* SLIP special character codes */
#define END 0300 /* indicates end of packet */
#define ESC 0333 /* indicates byte stuffing */
#define ESC_END 0334 /* ESC ESC_END means END data byte */
#define ESC_ESC 0335 /* ESC ESC_ESC means ESC data byte */
/* Operation modes */
#define MODE_SLIP 0
#define MODE_PPP 1
#define MODE_DEV 2
/* Dynamic slip interpretation modes */
#define DMODE_REMOTE 0
#define DMODE_LOCAL 1
#define DMODE_REMOTE_LOCAL 2
#define DMODE_LOCAL_REMOTE 3
#define DMODE_BOOTP 4
/* Define DEBUG flags */
#define DEBUG_FILTER_MATCH 0x0001
#define DEBUG_PROXYARP 0x0004
#define DEBUG_VERBOSE 0x0008
#define DEBUG_STATE_CONTROL 0x0010
#define DEBUG_TICK 0x0020
#define DEBUG_CONNECTION_QUEUE 0x0040
/* Define MONITOR flags */
#define MONITOR_STATE 0x0001
#define MONITOR_INTERFACE 0x0002
#define MONITOR_STATUS 0x0004
#define MONITOR_LOAD 0x0008
#define MONITOR_MESSAGE 0x0010
#define MONITOR_QUEUE 0x0020
/*
* If you choose UNSAFE_ROUTING=0, then by default diald will route all
* outgoing packets to the proxy device and forward them to the real
* device by itself. This has the advantage that it gets around a bug
* in the current production release (1.2.X) linux kernels
* that causes TCP sessions to lock up if the route is changed while
* a packet is being retransmitted. However, this introduces quite
* a bit of overhead on outgoing packets (10-20%). (Note that incoming packets
* don't go through this process!)
* If you choose UNSAFE_ROUTING=1, then diald will change the routes anyway.
* If you are using diald on a machine were there is a single outgoing
* link this is perfectly safe (I think!), but if diald is being used
* in an environment where more than one ppp or slip link can be active
* at a time, then there is a small chance that you can lock up TCP
* sessions. In particular if the link is terminated (either by diald
* or by the other end hanging up) when a TCP session is in the middle
* of retransmitting a packet, then that TCP session can become locked
* if when the link comes back up it is brought back up on a different
* ppp or slip device.
* [NOTE: As of linux 1.3.13, the Linux kernel has been
* fixed to allow routing changes under an active TCP retransmit,
* so with 1.3.13 and later UNSAFE_ROUTING as the default is perfectly safe.]
* [NOTE 2: unlike previous versions of diald, this option can now be
* controlled from the command line or configuration file. See the new
* options "reroute" and "-reroute".
*/
#define UNSAFE_ROUTING 1 /* do rerouting by default */
/*
* Originally diald just threw away any packets it received when
* the link was down. This is OK because IP is an unreliable protocol,
* so applications will resend packets when the link comes back up.
* On the other hand the kernel doubles the timeout for TCP packets
* every time a send fails. If you define BUFFER_PACKETS diald
* will store packets that come along when the link is down and
* send them as soon as the link comes up. This should speed up
* the initial connections a bit.
*/
#define BUFFER_PACKETS 1 /* turn on packet buffering code. */
#define BUFFER_SIZE 65536 /* size of buffer to store packets */
#define BUFFER_FIFO_DISPOSE 1 /* dispose of old packets to make room
* for new packets if the buffer becomes
* full. Without this option new packets
* are discarded if there is no room.
*/
#define BUFFER_TIMEOUT 600 /* Maximum number of seconds to keep a
* packet in the buffer. Don't make this
* too large or you will break IP.
* (Something on the order of 1 hour
* probably the maximum safe value.
* I expect that the 10 minutes defined
* by default should be plenty.
*/
/*
* Various timeouts and times used in diald.
*/
#define PAUSETIME 1 /* how many seconds should diald sleep each time
it checks to see what's happening. Note that
this is a maximum time and that a packet
arriving will cut the nap short. */
#define DEFAULT_FIRST_PACKET_TIMEOUT 120
#define DEFAULT_DIAL_DELAY 30
#define DEFAULT_MTU 1500
#define DEFAULT_SPEED 38400
typedef struct monitors {
struct monitors *next;
int fd; /* monitor output fp. */
int level; /* Information level requested */
char *name;
} MONITORS;
/* Configuration variables */
char **devices;
int device_count;
char device[10];
char device_node[9];
int device_iface;
int inspeed;
int window;
int mtu;
int mru;
char *connector;
char *disconnector;
char *orig_local_ip;
char *orig_remote_ip;
char *local_ip;
unsigned long local_addr;
char *remote_ip;
char *netmask;
char *addroute;
char *delroute;
char *ip_up;
char *ip_down;
char *acctlog;
char *pidlog;
char *fifoname;
char *lock_prefix;
int pidstring;
char *run_prefix;
char *diald_config_file;
char *diald_defs_file;
char *path_route;
char *path_ifconfig;
char *path_bootpc;
char *path_pppd;
int buffer_packets;
int buffer_size;
int buffer_fifo_dispose;
int buffer_timeout;
FILE *acctfp;
int call_start_time;
int mode;
int debug;
int modem;
int rotate_devices;
int crtscts;
int daemon_flag;
int strict_forwarding;
int dynamic_addrs;
int dynamic_mode;
int slip_encap;
int lock_dev;
int default_route;
int pppd_argc;
char **pppd_argv;
int connect_timeout;
int disconnect_timeout;
int redial_timeout;
int nodev_retry_timeout;
int stop_dial_timeout;
int kill_timeout;
int start_pppd_timeout;
int stop_pppd_timeout;
int first_packet_timeout;
int retry_count;
int died_retry_count;
int redial_backoff_start;
int redial_backoff_limit;
int redial_backoff;
int dial_fail_limit;
int two_way;
int give_way;
int do_reroute;
int proxyarp;
int route_wait;
#ifdef SIOCSKEEPALIVE
extern int keepalive;
#endif
#ifdef SIOCSOUTFILL
extern int outfill;
#endif
/* Global variables */
#ifdef DEBIAN_REDIRECT_PPPD_STDERR
int pppd_stderr_fd; /* STDERR from pppd */
#endif /* ndef DEBIAN_REDIRECT_PPPD_STDERR */
int fifo_fd; /* FIFO command pipe. */
MONITORS *monitors; /* List of monitor pipes. */
int proxy_mfd; /* master pty fd */
FILE *proxy_mfp; /* also have an fp. Hackery for recv_packet. */
int proxy_sfd; /* slave pty fd */
int modem_fd; /* modem device fp (for slip links) */
char packet[4096]; /* slip packet buffer */
int modem_hup; /* have we seen a modem HUP? */
int request_down; /* has the user requested link down? */
int request_up; /* has the user requested link up? */
int forced; /* has the user requested the link forced up? */
int link_pid; /* current pppd command pid */
int dial_pid; /* current dial command pid */
int running_pid; /* current system command pid */
int dial_status; /* status from last dial command */
int state_timeout; /* state machine timeout counter */
int blocked; /* user has blocked the link */
int state; /* DFA state */
int current_retry_count; /* current retry count */
int proxy_iface; /* Interface number for proxy pty */
int link_iface; /* Interface number for ppp line */
int orig_disc; /* original PTY line disciple */
int fwdfd; /* control socket for packet forwarding */
int snoopfd; /* snooping socket fd */
int fwunit; /* firewall unit for firewall control */
int req_pid; /* pid of process that made "request" */
char *req_dev; /* name of the device file requested to open */
int use_req; /* are we actually using the FIFO link-up request device? */
char snoop_dev[10]; /* The interface name we are listening on */
int txtotal,rxtotal; /* transfer stats for the link */
int itxtotal, irxtotal; /* instantaneous transfer stats */
int delayed_quit; /* has the user requested delayed termination?*/
int terminate; /* has the user requested termination? */
int impulse_time; /* time for current impulses */
int impulse_init_time; /* initial time for current impulses */
int impulse_fuzz; /* fuzz for current impulses */
char *pidfile; /* full path filename of pid file */
int force_dynamic; /* 1 if the current connect passed back addrs */
int redial_rtimeout; /* current real redial timeout */
int dial_failures; /* number of dial failures since last success */
int ppp_half_dead; /* is the ppp link half dead? */
/* function prototypes */
void init_vars(void);
void parse_init(void);
void parse_options_file(char *);
void parse_args(int, char *[]);
void check_setup(void);
void signal_setup(void);
void default_sigacts(void);
void block_signals(void);
void unblock_signals(void);
void filter_setup(void);
void get_pty(int *, int *);
void proxy_up(void);
void proxy_down(void);
void proxy_config(char *, char *);
void dynamic_slip(void);
void idle_filter_proxy(void);
void open_fifo(void);
void filter_read(void);
void fifo_read(void);
void proxy_read(void);
void modem_read(void);
void advance_filter_queue(void);
void fire_timers(void);
int recv_packet(unsigned char *, size_t);
void send_packet(unsigned char *, size_t);
void sig_hup(int);
void sig_intr(int);
void sig_term(int);
void sig_io(int);
void sig_chld(int);
void sig_pipe(int);
void linkup(int);
void die(int);
void print_filter_queue(int);
void monitor_queue(void);
void become_daemon(void);
void change_state(void);
void output_state(void);
void add_device(void *, char **);
void set_str(char **, char **);
void set_int(int *, char **);
void set_flag(int *, char **);
void clear_flag(int *, char **);
void set_mode(char **, char **);
void set_dslip_mode(char **, char **);
void read_config_file(int *, char **);
void add_filter(void *var, char **);
int insert_packet(unsigned char *, int);
int lock(char *dev);
void unlock(void);
void fork_dialer(char *, int);
void fork_connect(char *);
void flush_timeout_queue(void);
void set_up_tty(int, int, int);
void flush_prules(void);
void flush_filters(void);
void flush_vars(void);
void parse_impulse(void *var, char **argv);
void parse_restrict(void *var, char **argv);
void parse_or_restrict(void *var, char **argv);
void parse_bringup(void *var, char **argv);
void parse_keepup(void *var, char **argv);
void parse_accept(void *var, char **argv);
void parse_ignore(void *var, char **argv);
void parse_wait(void *var, char **argv);
void parse_up(void *var, char **argv);
void parse_down(void *var, char **argv);
void parse_prule(void *var, char **argv);
void parse_var(void *var, char **argv);
void close_modem(void);
int open_modem (void);
void reopen_modem (void);
void finish_dial(void);
void ppp_start(void);
int ppp_set_addrs(void);
int ppp_dead(void);
int ppp_route_exists(void);
void ppp_stop(void);
void ppp_reroute(void);
void ppp_kill(void);
void ppp_zombie(void);
int ppp_rx_count(void);
void slip_start(void);
int slip_set_addrs(void);
int slip_dead(void);
void slip_stop(void);
void slip_reroute(void);
void slip_kill(void);
void slip_zombie(void);
int slip_rx_count(void);
void dev_start(void);
int dev_set_addrs(void);
int dev_dead(void);
void dev_stop(void);
void dev_reroute(void);
void dev_kill(void);
void dev_zombie(void);
int dev_rx_count(void);
void idle_filter_init(void);
void interface_up(void);
void interface_down(void);
void buffer_init(int *, char **);
int queue_empty(void);
int fw_wait(void);
int fw_reset_wait(void);
int next_alarm(void);
void buffer_packet(unsigned int,unsigned char *);
void forward_buffer(void);
void run_ip_up(void);
void run_ip_down(void);
void set_ptp(char *, int, char *, int);
void add_routes(char *, int, char *, char *, int);
void del_routes(char *, int, char *, char *, int);
void pipe_init(int, PIPE *);
int pipe_read(PIPE *);
void pipe_flush(PIPE *, int);
int set_proxyarp (unsigned int);
int clear_proxyarp (unsigned int);
int report_system_result(int,char *);
void mon_write(int,char *,int);
void background_system(const char *);
void block_timer();
void unblock_timer();
int getservice(const char *name, const char *proto);
int getprotocol(const char *name);
char *getprotonumber(int proto);
int getsn(FILE *fp,char *buf,int len);
void del_impulse(FW_unit *unit);
void del_connection(FW_Connection *c);
void slip_start_fail(void * data);
|