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main.c
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main.c
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/*
* main.c - Point-to-Point Protocol main module
*
* Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The name "Carnegie Mellon University" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For permission or any legal
* details, please contact
* Office of Technology Transfer
* Carnegie Mellon University
* 5000 Forbes Avenue
* Pittsburgh, PA 15213-3890
* (412) 268-4387, fax: (412) 268-7395
* tech-transfer@andrew.cmu.edu
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Computing Services
* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Copyright (c) 1999-2004 Paul Mackerras. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. The name(s) of the authors of this software must not be used to
* endorse or promote products derived from this software without
* prior written permission.
*
* 3. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Paul Mackerras
* <paulus@samba.org>".
*
* THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#define RCSID "$Id: main.c,v 1.156 2008/06/23 11:47:18 paulus Exp $"
#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <fcntl.h>
#include <syslog.h>
#include <netdb.h>
#include <utmp.h>
#include <pwd.h>
#include <setjmp.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "pppd.h"
#include "magic.h"
#include "fsm.h"
#include "lcp.h"
#include "ipcp.h"
#ifdef INET6
#include "ipv6cp.h"
#endif
#include "upap.h"
#include "chap-new.h"
#include "eap.h"
#include "ccp.h"
#include "ecp.h"
#include "pathnames.h"
#ifdef USE_TDB
#include "tdb.h"
#endif
#ifdef CBCP_SUPPORT
#include "cbcp.h"
#endif
#ifdef IPX_CHANGE
#include "ipxcp.h"
#endif /* IPX_CHANGE */
#ifdef AT_CHANGE
#include "atcp.h"
#endif
/* interface vars */
char ifname[MAXIFNAMELEN]; /* Interface name */
int ifunit; /* Interface unit number */
struct channel *the_channel;
char *progname; /* Name of this program */
char hostname[MAXNAMELEN]; /* Our hostname */
static char pidfilename[MAXPATHLEN]; /* name of pid file */
static char linkpidfile[MAXPATHLEN]; /* name of linkname pid file */
char ppp_devnam[MAXPATHLEN]; /* name of PPP tty (maybe ttypx) */
uid_t uid; /* Our real user-id */
struct notifier *pidchange = NULL;
struct notifier *phasechange = NULL;
struct notifier *exitnotify = NULL;
struct notifier *sigreceived = NULL;
struct notifier *fork_notifier = NULL;
int hungup; /* terminal has been hung up */
int privileged; /* we're running as real uid root */
int need_holdoff; /* need holdoff period before restarting */
int detached; /* have detached from terminal */
volatile int status; /* exit status for pppd */
int unsuccess; /* # unsuccessful connection attempts */
int do_callback; /* != 0 if we should do callback next */
int doing_callback; /* != 0 if we are doing callback */
int ppp_session_number; /* Session number, for channels with such a
concept (eg PPPoE) */
int childwait_done; /* have timed out waiting for children */
#ifdef USE_TDB
TDB_CONTEXT *pppdb; /* database for storing status etc. */
#endif
char db_key[32];
int (*holdoff_hook) __P((void)) = NULL;
int (*new_phase_hook) __P((int)) = NULL;
void (*snoop_recv_hook) __P((unsigned char *p, int len)) = NULL;
void (*snoop_send_hook) __P((unsigned char *p, int len)) = NULL;
static int conn_running; /* we have a [dis]connector running */
static int fd_loop; /* fd for getting demand-dial packets */
int fd_devnull; /* fd for /dev/null */
int devfd = -1; /* fd of underlying device */
int fd_ppp = -1; /* fd for talking PPP */
int phase; /* where the link is at */
int kill_link;
int asked_to_quit;
int open_ccp_flag;
int listen_time;
int got_sigusr2;
int got_sigterm;
int got_sighup;
static sigset_t signals_handled;
static int waiting;
static sigjmp_buf sigjmp;
char **script_env; /* Env. variable values for scripts */
int s_env_nalloc; /* # words avail at script_env */
u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
static int n_children; /* # child processes still running */
static int got_sigchld; /* set if we have received a SIGCHLD */
int privopen; /* don't lock, open device as root */
char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
GIDSET_TYPE groups[NGROUPS_MAX];/* groups the user is in */
int ngroups; /* How many groups valid in groups */
static struct timeval start_time; /* Time when link was started. */
static struct pppd_stats old_link_stats;
struct pppd_stats link_stats;
unsigned link_connect_time;
int link_stats_valid;
int error_count;
bool bundle_eof;
bool bundle_terminating;
/*
* We maintain a list of child process pids and
* functions to call when they exit.
*/
struct subprocess {
pid_t pid;
char *prog;
void (*done) __P((void *));
void *arg;
int killable;
struct subprocess *next;
};
static struct subprocess *children;
/* Prototypes for procedures local to this file. */
static void setup_signals __P((void));
static void create_pidfile __P((int pid));
static void create_linkpidfile __P((int pid));
static void cleanup __P((void));
static void get_input __P((void));
static void calltimeout __P((void));
static struct timeval *timeleft __P((struct timeval *));
static void kill_my_pg __P((int));
static void hup __P((int));
static void term __P((int));
static void chld __P((int));
static void toggle_debug __P((int));
static void open_ccp __P((int));
static void bad_signal __P((int));
static void holdoff_end __P((void *));
static void forget_child __P((int pid, int status));
static int reap_kids __P((void));
static void childwait_end __P((void *));
#ifdef USE_TDB
static void update_db_entry __P((void));
static void add_db_key __P((const char *));
static void delete_db_key __P((const char *));
static void cleanup_db __P((void));
#endif
static void handle_events __P((void));
void print_link_stats __P((void));
extern char *getlogin __P((void));
int main __P((int, char *[]));
#ifdef ultrix
#undef O_NONBLOCK
#define O_NONBLOCK O_NDELAY
#endif
#ifdef ULTRIX
#define setlogmask(x)
#endif
/*
* PPP Data Link Layer "protocol" table.
* One entry per supported protocol.
* The last entry must be NULL.
*/
struct protent *protocols[] = {
&lcp_protent,
&pap_protent,
&chap_protent,
#ifdef CBCP_SUPPORT
&cbcp_protent,
#endif
&ipcp_protent,
#ifdef INET6
&ipv6cp_protent,
#endif
&ccp_protent,
&ecp_protent,
#ifdef IPX_CHANGE
&ipxcp_protent,
#endif
#ifdef AT_CHANGE
&atcp_protent,
#endif
&eap_protent,
NULL
};
int
main(argc, argv)
int argc;
char *argv[];
{
int i, t;
char *p;
struct passwd *pw;
struct protent *protp;
char numbuf[16];
link_stats_valid = 0;
new_phase(PHASE_INITIALIZE);
script_env = NULL;
/* Initialize syslog facilities */
reopen_log();
if (gethostname(hostname, MAXNAMELEN) < 0 ) {
option_error("Couldn't get hostname: %m");
exit(1);
}
hostname[MAXNAMELEN-1] = 0;
/* make sure we don't create world or group writable files. */
umask(umask(0777) | 022);
uid = getuid();
privileged = uid == 0;
slprintf(numbuf, sizeof(numbuf), "%d", uid);
script_setenv("ORIG_UID", numbuf, 0);
ngroups = getgroups(NGROUPS_MAX, groups);
/*
* Initialize magic number generator now so that protocols may
* use magic numbers in initialization.
*/
magic_init();
/*
* Initialize each protocol.
*/
for (i = 0; (protp = protocols[i]) != NULL; ++i)
(*protp->init)(0);
/*
* Initialize the default channel.
*/
tty_init();
progname = *argv;
/*
* Parse, in order, the system options file, the user's options file,
* and the command line arguments.
*/
if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
|| !options_from_user()
|| !parse_args(argc-1, argv+1))
exit(EXIT_OPTION_ERROR);
devnam_fixed = 1; /* can no longer change device name */
/*
* Work out the device name, if it hasn't already been specified,
* and parse the tty's options file.
*/
if (the_channel->process_extra_options)
(*the_channel->process_extra_options)();
if (debug)
setlogmask(LOG_UPTO(LOG_DEBUG));
/*
* Check that we are running as root.
*/
if (geteuid() != 0) {
option_error("must be root to run %s, since it is not setuid-root",
argv[0]);
exit(EXIT_NOT_ROOT);
}
if (!ppp_available()) {
option_error("%s", no_ppp_msg);
exit(EXIT_NO_KERNEL_SUPPORT);
}
/*
* Check that the options given are valid and consistent.
*/
check_options();
if (!sys_check_options())
exit(EXIT_OPTION_ERROR);
auth_check_options();
#ifdef HAVE_MULTILINK
mp_check_options();
#endif
for (i = 0; (protp = protocols[i]) != NULL; ++i)
if (protp->check_options != NULL)
(*protp->check_options)();
if (the_channel->check_options)
(*the_channel->check_options)();
if (dump_options || dryrun) {
init_pr_log(NULL, LOG_INFO);
print_options(pr_log, NULL);
end_pr_log();
}
if (dryrun)
die(0);
/* Make sure fds 0, 1, 2 are open to somewhere. */
fd_devnull = open(_PATH_DEVNULL, O_RDWR);
if (fd_devnull < 0)
fatal("Couldn't open %s: %m", _PATH_DEVNULL);
while (fd_devnull <= 2) {
i = dup(fd_devnull);
if (i < 0)
fatal("Critical shortage of file descriptors: dup failed: %m");
fd_devnull = i;
}
/*
* Initialize system-dependent stuff.
*/
sys_init();
#ifdef USE_TDB
pppdb = tdb_open(_PATH_PPPDB, 0, 0, O_RDWR|O_CREAT, 0644);
if (pppdb != NULL) {
slprintf(db_key, sizeof(db_key), "pppd%d", getpid());
update_db_entry();
} else {
warn("Warning: couldn't open ppp database %s", _PATH_PPPDB);
if (multilink) {
warn("Warning: disabling multilink");
multilink = 0;
}
}
#endif
/*
* Detach ourselves from the terminal, if required,
* and identify who is running us.
*/
if (!nodetach && !updetach)
detach();
p = getlogin();
if (p == NULL) {
pw = getpwuid(uid);
if (pw != NULL && pw->pw_name != NULL)
p = pw->pw_name;
else
p = "(unknown)";
}
syslog(LOG_NOTICE, "pppd %s started by %s, uid %d", VERSION, p, uid);
script_setenv("PPPLOGNAME", p, 0);
if (devnam[0])
script_setenv("DEVICE", devnam, 1);
slprintf(numbuf, sizeof(numbuf), "%d", getpid());
script_setenv("PPPD_PID", numbuf, 1);
setup_signals();
create_linkpidfile(getpid());
waiting = 0;
/*
* If we're doing dial-on-demand, set up the interface now.
*/
if (demand) {
/*
* Open the loopback channel and set it up to be the ppp interface.
*/
fd_loop = open_ppp_loopback();
set_ifunit(1);
/*
* Configure the interface and mark it up, etc.
*/
demand_conf();
}
do_callback = 0;
for (;;) {
bundle_eof = 0;
bundle_terminating = 0;
listen_time = 0;
need_holdoff = 1;
devfd = -1;
status = EXIT_OK;
++unsuccess;
doing_callback = do_callback;
do_callback = 0;
if (demand && !doing_callback) {
/*
* Don't do anything until we see some activity.
*/
new_phase(PHASE_DORMANT);
demand_unblock();
add_fd(fd_loop);
for (;;) {
handle_events();
if (asked_to_quit)
break;
if (get_loop_output())
break;
}
remove_fd(fd_loop);
if (asked_to_quit)
break;
/*
* Now we want to bring up the link.
*/
demand_block();
info("Starting link");
}
gettimeofday(&start_time, NULL);
script_unsetenv("CONNECT_TIME");
script_unsetenv("BYTES_SENT");
script_unsetenv("BYTES_RCVD");
lcp_open(0); /* Start protocol */
start_link(0);
while (phase != PHASE_DEAD) {
handle_events();
get_input();
if (kill_link)
lcp_close(0, "User request");
if (asked_to_quit) {
bundle_terminating = 1;
if (phase == PHASE_MASTER)
mp_bundle_terminated();
}
if (open_ccp_flag) {
if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) {
ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
(*ccp_protent.open)(0);
}
}
}
/* restore FSMs to original state */
lcp_close(0, "");
if (!persist || asked_to_quit || (maxfail > 0 && unsuccess >= maxfail))
break;
if (demand)
demand_discard();
t = need_holdoff? holdoff: 0;
if (holdoff_hook)
t = (*holdoff_hook)();
if (t > 0) {
new_phase(PHASE_HOLDOFF);
TIMEOUT(holdoff_end, NULL, t);
do {
handle_events();
if (kill_link)
new_phase(PHASE_DORMANT); /* allow signal to end holdoff */
} while (phase == PHASE_HOLDOFF);
if (!persist)
break;
}
}
/* Wait for scripts to finish */
reap_kids();
if (n_children > 0) {
if (child_wait > 0)
TIMEOUT(childwait_end, NULL, child_wait);
if (debug) {
struct subprocess *chp;
dbglog("Waiting for %d child processes...", n_children);
for (chp = children; chp != NULL; chp = chp->next)
dbglog(" script %s, pid %d", chp->prog, chp->pid);
}
while (n_children > 0 && !childwait_done) {
handle_events();
if (kill_link && !childwait_done)
childwait_end(NULL);
}
}
die(status);
return 0;
}
/*
* handle_events - wait for something to happen and respond to it.
*/
static void
handle_events()
{
struct timeval timo;
kill_link = open_ccp_flag = 0;
if (sigsetjmp(sigjmp, 1) == 0) {
sigprocmask(SIG_BLOCK, &signals_handled, NULL);
if (got_sighup || got_sigterm || got_sigusr2 || got_sigchld) {
sigprocmask(SIG_UNBLOCK, &signals_handled, NULL);
} else {
waiting = 1;
sigprocmask(SIG_UNBLOCK, &signals_handled, NULL);
wait_input(timeleft(&timo));
}
}
waiting = 0;
calltimeout();
if (got_sighup) {
info("Hangup (SIGHUP)");
kill_link = 1;
got_sighup = 0;
if (status != EXIT_HANGUP)
status = EXIT_USER_REQUEST;
}
if (got_sigterm) {
info("Terminating on signal %d", got_sigterm);
kill_link = 1;
asked_to_quit = 1;
persist = 0;
status = EXIT_USER_REQUEST;
got_sigterm = 0;
}
if (got_sigchld) {
got_sigchld = 0;
reap_kids(); /* Don't leave dead kids lying around */
}
if (got_sigusr2) {
open_ccp_flag = 1;
got_sigusr2 = 0;
}
}
/*
* setup_signals - initialize signal handling.
*/
static void
setup_signals()
{
struct sigaction sa;
/*
* Compute mask of all interesting signals and install signal handlers
* for each. Only one signal handler may be active at a time. Therefore,
* all other signals should be masked when any handler is executing.
*/
sigemptyset(&signals_handled);
sigaddset(&signals_handled, SIGHUP);
sigaddset(&signals_handled, SIGINT);
sigaddset(&signals_handled, SIGTERM);
sigaddset(&signals_handled, SIGCHLD);
sigaddset(&signals_handled, SIGUSR2);
#define SIGNAL(s, handler) do { \
sa.sa_handler = handler; \
if (sigaction(s, &sa, NULL) < 0) \
fatal("Couldn't establish signal handler (%d): %m", s); \
} while (0)
sa.sa_mask = signals_handled;
sa.sa_flags = 0;
SIGNAL(SIGHUP, hup); /* Hangup */
SIGNAL(SIGINT, term); /* Interrupt */
SIGNAL(SIGTERM, term); /* Terminate */
SIGNAL(SIGCHLD, chld);
SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
/*
* Install a handler for other signals which would otherwise
* cause pppd to exit without cleaning up.
*/
SIGNAL(SIGABRT, bad_signal);
SIGNAL(SIGALRM, bad_signal);
SIGNAL(SIGFPE, bad_signal);
SIGNAL(SIGILL, bad_signal);
SIGNAL(SIGPIPE, bad_signal);
SIGNAL(SIGQUIT, bad_signal);
SIGNAL(SIGSEGV, bad_signal);
#ifdef SIGBUS
SIGNAL(SIGBUS, bad_signal);
#endif
#ifdef SIGEMT
SIGNAL(SIGEMT, bad_signal);
#endif
#ifdef SIGPOLL
SIGNAL(SIGPOLL, bad_signal);
#endif
#ifdef SIGPROF
SIGNAL(SIGPROF, bad_signal);
#endif
#ifdef SIGSYS
SIGNAL(SIGSYS, bad_signal);
#endif
#ifdef SIGTRAP
SIGNAL(SIGTRAP, bad_signal);
#endif
#ifdef SIGVTALRM
SIGNAL(SIGVTALRM, bad_signal);
#endif
#ifdef SIGXCPU
SIGNAL(SIGXCPU, bad_signal);
#endif
#ifdef SIGXFSZ
SIGNAL(SIGXFSZ, bad_signal);
#endif
/*
* Apparently we can get a SIGPIPE when we call syslog, if
* syslogd has died and been restarted. Ignoring it seems
* be sufficient.
*/
signal(SIGPIPE, SIG_IGN);
}
/*
* set_ifunit - do things we need to do once we know which ppp
* unit we are using.
*/
void
set_ifunit(iskey)
int iskey;
{
if (req_ifname[0] != '\0')
slprintf(ifname, sizeof(ifname), "%s", req_ifname);
else
slprintf(ifname, sizeof(ifname), "%s%d", PPP_DRV_NAME, ifunit);
info("Using interface %s", ifname);
script_setenv("IFNAME", ifname, iskey);
if (iskey) {
create_pidfile(getpid()); /* write pid to file */
create_linkpidfile(getpid());
}
}
/*
* detach - detach us from the controlling terminal.
*/
void
detach()
{
int pid;
char numbuf[16];
int pipefd[2];
if (detached)
return;
if (pipe(pipefd) == -1)
pipefd[0] = pipefd[1] = -1;
if ((pid = fork()) < 0) {
error("Couldn't detach (fork failed: %m)");
die(1); /* or just return? */
}
if (pid != 0) {
/* parent */
notify(pidchange, pid);
/* update pid files if they have been written already */
if (pidfilename[0])
create_pidfile(pid);
if (linkpidfile[0])
create_linkpidfile(pid);
exit(0); /* parent dies */
}
setsid();
chdir("/");
dup2(fd_devnull, 0);
dup2(fd_devnull, 1);
dup2(fd_devnull, 2);
detached = 1;
if (log_default)
log_to_fd = -1;
slprintf(numbuf, sizeof(numbuf), "%d", getpid());
script_setenv("PPPD_PID", numbuf, 1);
/* wait for parent to finish updating pid & lock files and die */
close(pipefd[1]);
complete_read(pipefd[0], numbuf, 1);
close(pipefd[0]);
}
/*
* reopen_log - (re)open our connection to syslog.
*/
void
reopen_log()
{
openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
setlogmask(LOG_UPTO(LOG_INFO));
}
/*
* Create a file containing our process ID.
*/
static void
create_pidfile(pid)
int pid;
{
FILE *pidfile;
slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid",
_PATH_VARRUN, ifname);
if ((pidfile = fopen(pidfilename, "w")) != NULL) {
fprintf(pidfile, "%d\n", pid);
(void) fclose(pidfile);
} else {
error("Failed to create pid file %s: %m", pidfilename);
pidfilename[0] = 0;
}
}
void
create_linkpidfile(pid)
int pid;
{
FILE *pidfile;
if (linkname[0] == 0)
return;
script_setenv("LINKNAME", linkname, 1);
slprintf(linkpidfile, sizeof(linkpidfile), "%sppp-%s.pid",
_PATH_VARRUN, linkname);
if ((pidfile = fopen(linkpidfile, "w")) != NULL) {
fprintf(pidfile, "%d\n", pid);
if (ifname[0])
fprintf(pidfile, "%s\n", ifname);
(void) fclose(pidfile);
} else {
error("Failed to create pid file %s: %m", linkpidfile);
linkpidfile[0] = 0;
}
}
/*
* remove_pidfile - remove our pid files
*/
void remove_pidfiles()
{
if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
warn("unable to delete pid file %s: %m", pidfilename);
pidfilename[0] = 0;
if (linkpidfile[0] != 0 && unlink(linkpidfile) < 0 && errno != ENOENT)
warn("unable to delete pid file %s: %m", linkpidfile);
linkpidfile[0] = 0;
}
/*
* holdoff_end - called via a timeout when the holdoff period ends.
*/
static void
holdoff_end(arg)
void *arg;
{
new_phase(PHASE_DORMANT);
}
/* List of protocol names, to make our messages a little more informative. */
struct protocol_list {
u_short proto;
const char *name;
} protocol_list[] = {
{ 0x21, "IP" },
{ 0x23, "OSI Network Layer" },
{ 0x25, "Xerox NS IDP" },
{ 0x27, "DECnet Phase IV" },
{ 0x29, "Appletalk" },
{ 0x2b, "Novell IPX" },
{ 0x2d, "VJ compressed TCP/IP" },
{ 0x2f, "VJ uncompressed TCP/IP" },
{ 0x31, "Bridging PDU" },
{ 0x33, "Stream Protocol ST-II" },
{ 0x35, "Banyan Vines" },
{ 0x39, "AppleTalk EDDP" },
{ 0x3b, "AppleTalk SmartBuffered" },
{ 0x3d, "Multi-Link" },
{ 0x3f, "NETBIOS Framing" },
{ 0x41, "Cisco Systems" },
{ 0x43, "Ascom Timeplex" },
{ 0x45, "Fujitsu Link Backup and Load Balancing (LBLB)" },
{ 0x47, "DCA Remote Lan" },
{ 0x49, "Serial Data Transport Protocol (PPP-SDTP)" },
{ 0x4b, "SNA over 802.2" },
{ 0x4d, "SNA" },
{ 0x4f, "IP6 Header Compression" },
{ 0x51, "KNX Bridging Data" },
{ 0x53, "Encryption" },
{ 0x55, "Individual Link Encryption" },
{ 0x57, "IPv6" },
{ 0x59, "PPP Muxing" },
{ 0x5b, "Vendor-Specific Network Protocol" },
{ 0x61, "RTP IPHC Full Header" },
{ 0x63, "RTP IPHC Compressed TCP" },
{ 0x65, "RTP IPHC Compressed non-TCP" },
{ 0x67, "RTP IPHC Compressed UDP 8" },
{ 0x69, "RTP IPHC Compressed RTP 8" },
{ 0x6f, "Stampede Bridging" },
{ 0x73, "MP+" },
{ 0xc1, "NTCITS IPI" },
{ 0xfb, "single-link compression" },
{ 0xfd, "Compressed Datagram" },
{ 0x0201, "802.1d Hello Packets" },
{ 0x0203, "IBM Source Routing BPDU" },
{ 0x0205, "DEC LANBridge100 Spanning Tree" },
{ 0x0207, "Cisco Discovery Protocol" },
{ 0x0209, "Netcs Twin Routing" },
{ 0x020b, "STP - Scheduled Transfer Protocol" },
{ 0x020d, "EDP - Extreme Discovery Protocol" },
{ 0x0211, "Optical Supervisory Channel Protocol" },
{ 0x0213, "Optical Supervisory Channel Protocol" },
{ 0x0231, "Luxcom" },
{ 0x0233, "Sigma Network Systems" },
{ 0x0235, "Apple Client Server Protocol" },
{ 0x0281, "MPLS Unicast" },
{ 0x0283, "MPLS Multicast" },
{ 0x0285, "IEEE p1284.4 standard - data packets" },
{ 0x0287, "ETSI TETRA Network Protocol Type 1" },
{ 0x0289, "Multichannel Flow Treatment Protocol" },
{ 0x2063, "RTP IPHC Compressed TCP No Delta" },
{ 0x2065, "RTP IPHC Context State" },
{ 0x2067, "RTP IPHC Compressed UDP 16" },
{ 0x2069, "RTP IPHC Compressed RTP 16" },
{ 0x4001, "Cray Communications Control Protocol" },
{ 0x4003, "CDPD Mobile Network Registration Protocol" },
{ 0x4005, "Expand accelerator protocol" },
{ 0x4007, "ODSICP NCP" },
{ 0x4009, "DOCSIS DLL" },
{ 0x400B, "Cetacean Network Detection Protocol" },
{ 0x4021, "Stacker LZS" },
{ 0x4023, "RefTek Protocol" },
{ 0x4025, "Fibre Channel" },
{ 0x4027, "EMIT Protocols" },
{ 0x405b, "Vendor-Specific Protocol (VSP)" },
{ 0x8021, "Internet Protocol Control Protocol" },
{ 0x8023, "OSI Network Layer Control Protocol" },
{ 0x8025, "Xerox NS IDP Control Protocol" },
{ 0x8027, "DECnet Phase IV Control Protocol" },
{ 0x8029, "Appletalk Control Protocol" },
{ 0x802b, "Novell IPX Control Protocol" },
{ 0x8031, "Bridging NCP" },
{ 0x8033, "Stream Protocol Control Protocol" },
{ 0x8035, "Banyan Vines Control Protocol" },
{ 0x803d, "Multi-Link Control Protocol" },
{ 0x803f, "NETBIOS Framing Control Protocol" },
{ 0x8041, "Cisco Systems Control Protocol" },
{ 0x8043, "Ascom Timeplex" },
{ 0x8045, "Fujitsu LBLB Control Protocol" },
{ 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" },
{ 0x8049, "Serial Data Control Protocol (PPP-SDCP)" },
{ 0x804b, "SNA over 802.2 Control Protocol" },
{ 0x804d, "SNA Control Protocol" },
{ 0x804f, "IP6 Header Compression Control Protocol" },
{ 0x8051, "KNX Bridging Control Protocol" },
{ 0x8053, "Encryption Control Protocol" },
{ 0x8055, "Individual Link Encryption Control Protocol" },
{ 0x8057, "IPv6 Control Protocol" },
{ 0x8059, "PPP Muxing Control Protocol" },
{ 0x805b, "Vendor-Specific Network Control Protocol (VSNCP)" },
{ 0x806f, "Stampede Bridging Control Protocol" },
{ 0x8073, "MP+ Control Protocol" },
{ 0x80c1, "NTCITS IPI Control Protocol" },
{ 0x80fb, "Single Link Compression Control Protocol" },
{ 0x80fd, "Compression Control Protocol" },
{ 0x8207, "Cisco Discovery Protocol Control" },
{ 0x8209, "Netcs Twin Routing" },
{ 0x820b, "STP - Control Protocol" },
{ 0x820d, "EDPCP - Extreme Discovery Protocol Ctrl Prtcl" },
{ 0x8235, "Apple Client Server Protocol Control" },
{ 0x8281, "MPLSCP" },
{ 0x8285, "IEEE p1284.4 standard - Protocol Control" },
{ 0x8287, "ETSI TETRA TNP1 Control Protocol" },
{ 0x8289, "Multichannel Flow Treatment Protocol" },
{ 0xc021, "Link Control Protocol" },
{ 0xc023, "Password Authentication Protocol" },
{ 0xc025, "Link Quality Report" },
{ 0xc027, "Shiva Password Authentication Protocol" },
{ 0xc029, "CallBack Control Protocol (CBCP)" },
{ 0xc02b, "BACP Bandwidth Allocation Control Protocol" },
{ 0xc02d, "BAP" },
{ 0xc05b, "Vendor-Specific Authentication Protocol (VSAP)" },
{ 0xc081, "Container Control Protocol" },
{ 0xc223, "Challenge Handshake Authentication Protocol" },
{ 0xc225, "RSA Authentication Protocol" },
{ 0xc227, "Extensible Authentication Protocol" },
{ 0xc229, "Mitsubishi Security Info Exch Ptcl (SIEP)" },
{ 0xc26f, "Stampede Bridging Authorization Protocol" },
{ 0xc281, "Proprietary Authentication Protocol" },
{ 0xc283, "Proprietary Authentication Protocol" },
{ 0xc481, "Proprietary Node ID Authentication Protocol" },
{ 0, NULL },
};
/*
* protocol_name - find a name for a PPP protocol.
*/