blob: b086a0da10c2d9670c817dfd791e0c94508ca4d2 [file] [log] [blame]
/*
* main.c - Point-to-Point Protocol main module
*
* Copyright (c) 1989 Carnegie Mellon University.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by Carnegie Mellon University. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#define RCSID "$Id: main.c,v 1.1 2008-08-04 06:11:52 winfred 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 <sys/time.h>
#include "pppd.h"
#include "magic.h"
#include "fsm.h"
#include "lcp.h"
#include "ipcp.h"
#include "upap.h"
#include "chap.h"
#include "ccp.h"
#include "pathnames.h"
#include "../../include/netapi.h"
#ifdef CBCP_SUPPORT
#include "cbcp.h"
#endif
#ifdef IPX_CHANGE
#include "ipxcp.h"
#endif /* IPX_CHANGE */
#ifdef AT_CHANGE
#include "atcp.h"
#endif
static const char rcsid[] = RCSID;
/* interface vars */
char ifname[32]; /* 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 */
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 */
#define pppdb NULL
int (*holdoff_hook) __P((void)) = NULL;
int (*new_phase_hook) __P((int)) = NULL;
static int conn_running; /* we have a [dis]connector running */
static int devfd; /* fd of underlying device */
static int fd_ppp = -1; /* fd for talking PPP */
static int fd_loop; /* fd for getting demand-dial packets */
int phase; /* where the link is at */
int kill_link;
int open_ccp_flag;
int listen_time;
int got_sigusr2;
int got_sigterm;
int got_sighup;
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. */
struct pppd_stats link_stats;
int link_connect_time;
int link_stats_valid;
/*
* 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;
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((void));
static void create_linkpidfile __P((void));
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 int reap_kids __P((int waitfor));
#define update_db_entry()
#define add_db_key(a)
#define delete_db_key(a)
#define cleanup_db()
static void handle_events __P((void));
extern char *ttyname __P((int));
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,
#ifdef CHAP_SUPPORT
&chap_protent,
#endif
&ipcp_protent,
#ifdef CCP_SUPPORT
&ccp_protent,
#endif
NULL
};
/*
* If PPP_DRV_NAME is not defined, use the default "ppp" as the device name.
*/
#if !defined(PPP_DRV_NAME)
#define PPP_DRV_NAME "ppp"
#endif /* !defined(PPP_DRV_NAME) */
/*
ÄÚ²¿¶¨Ê±Æ÷:
PPPOE/DHCP×ÔÊÊӦģʽÏ£¬ÓÅÏÈÖ´ÐÐPPPOE²¦ºÅ£¬
³¬Ê±ÔòÆô¶¯DHCP
*/
void time_out_action(int signo)
{
char pppoe_reply[8] = {0};
char path_sh[32] = {0};
char ethwan[32] = {0};
char cmd[100] = {0};
sc_cfg_get("pppoe_reply", pppoe_reply, sizeof(pppoe_reply));
if(0 == strcmp(pppoe_reply, "0"))
{
sc_cfg_get("path_sh", path_sh, sizeof(path_sh));
sc_cfg_get("ethwan", ethwan, sizeof(ethwan));
sprintf(cmd,"udhcpc -i %s -s %s/udhcpc.sh &",ethwan,path_sh);
system(cmd);
exit(1);
}
}
void init_sigaction()
{
struct sigaction my_act;
my_act.sa_handler = time_out_action;
my_act.sa_flags = 0;
sigemptyset(&my_act.sa_mask);
sigaction(SIGALRM,&my_act,NULL);
//signal(SIGALRM,time_out_action);
}
void init_time()
{
struct itimerval value;
value.it_value.tv_sec = 10;
value.it_value.tv_usec = 0;
value.it_interval.tv_sec = 0;
value.it_interval.tv_usec = 0;
sc_cfg_set("pppoe_reply", "0");
setitimer(ITIMER_REAL,&value,NULL);
}
int
main(argc, argv)
int argc;
char *argv[];
{
int i, t;
char *p;
struct passwd *pw;
struct protent *protp;
char numbuf[16];
char eth_mode[32] = {0};
sc_cfg_get("ethwan_mode", eth_mode, sizeof(eth_mode));
new_phase(PHASE_INITIALIZE);
//sc_cfg_set("ppp_status","ppp_connecting");//linxu
/*
* Ensure that fds 0, 1, 2 are open, to /dev/null if nowhere else.
* This way we can close 0, 1, 2 in detach() without clobbering
* a fd that we are using.
*/
if ((i = open("/dev/null", O_RDWR)) >= 0) {
while (0 <= i && i <= 2)
i = dup(i);
if (i >= 0)
close(i);
}
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);
progname = *argv;
/*
* Parse, in order, the system options file, the user's options file,
* and the command line arguments.
*/
if (!parse_args(argc, argv))
exit(EXIT_OPTION_ERROR);
devnam_fixed = 1; /* can no longer change device name */
reopen_log(); // According to ipparam value, decide log 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();
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);
}
/*
* Initialize system-dependent stuff.
*/
sys_init();
/*
* 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();
if (0 == strcmp(eth_mode, "auto") || 0 == strcmp(eth_mode, "ondemand"))
{
init_sigaction();
init_time();
}
waiting = 0;
create_linkpidfile();
/*
* 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 (;;) {
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 (kill_link && !persist)
break;
if (get_loop_output())
break;
}
remove_fd(fd_loop);
if (kill_link && !persist)
break;
/*
* Now we want to bring up the link.
*/
demand_block();
info("Starting link");
}
new_phase(PHASE_SERIALCONN);
devfd = the_channel->connect();
if (devfd < 0)
continue;
/* set up the serial device as a ppp interface */
fd_ppp = the_channel->establish_ppp(devfd);
if (fd_ppp < 0) {
status = EXIT_FATAL_ERROR;
goto disconnect;
}
if (!demand && ifunit >= 0)
set_ifunit(1);
/*
* Start opening the connection and wait for
* incoming events (reply, timeout, etc.).
*/
notice("Connect: %s <--> %s", ifname, ppp_devnam);
my_gettimeofday(&start_time, NULL);
link_stats_valid = 0;
script_unsetenv("CONNECT_TIME");
script_unsetenv("BYTES_SENT");
script_unsetenv("BYTES_RCVD");
lcp_lowerup(0);
add_fd(fd_ppp);
lcp_open(0); /* Start protocol */
status = EXIT_NEGOTIATION_FAILED;
new_phase(PHASE_ESTABLISH);
while (phase != PHASE_DEAD) {
handle_events();
get_input();
if (kill_link)
lcp_close(0, "User request");
#ifdef CCP_SUPPORT
if (open_ccp_flag) {
if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) {
ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
(*ccp_protent.open)(0);
}
}
#endif
}
/*
* Print connect time and statistics.
*/
if (link_stats_valid) {
int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */
info("Connect time %d.%d minutes.", t/10, t%10);
info("Sent %u bytes, received %u bytes.",
link_stats.bytes_out, link_stats.bytes_in);
}
/*
* Delete pid file before disestablishing ppp. Otherwise it
* can happen that another pppd gets the same unit and then
* we delete its pid file.
*/
if (!demand) {
if (pidfilename[0] != 0
&& unlink(pidfilename) < 0 && errno != ENOENT)
warn("unable to delete pid file %s: %m", pidfilename);
pidfilename[0] = 0;
}
/*
* If we may want to bring the link up again, transfer
* the ppp unit back to the loopback. Set the
* real serial device back to its normal mode of operation.
*/
remove_fd(fd_ppp);
clean_check();
the_channel->disestablish_ppp(devfd);
fd_ppp = -1;
if (!hungup)
lcp_lowerdown(0);
if (!demand)
script_unsetenv("IFNAME");
disconnect:
new_phase(PHASE_DISCONNECT);
the_channel->disconnect();
/* fail: */
/*add by maxl begin, 2010-12-16*/
/*for setting ppp status to disconnected when pppoe down*/
//sc_cfg_set("ppp_status","ppp_disconnected"); //linxu
/*add by maxl end,2010-12-16*/
if (the_channel->cleanup)
(*the_channel->cleanup)();
if (!demand) {
if (pidfilename[0] != 0
&& unlink(pidfilename) < 0 && errno != ENOENT)
warn("unable to delete pid file %s: %m", pidfilename);
pidfilename[0] = 0;
}
if (!persist || (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 */
while (n_children > 0) {
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);
}
if (reap_kids(1) < 0)
break;
}
die(status);
return 0;
}
/*
* handle_events - wait for something to happen and respond to it.
*/
static void
handle_events()
{
struct timeval timo;
sigset_t mask;
kill_link = open_ccp_flag = 0;
if (sigsetjmp(sigjmp, 1) == 0) {
sigprocmask(SIG_BLOCK, &mask, NULL);
if (got_sighup || got_sigterm || got_sigusr2 || got_sigchld) {
sigprocmask(SIG_UNBLOCK, &mask, NULL);
} else {
waiting = 1;
sigprocmask(SIG_UNBLOCK, &mask, NULL);
wait_input(timeleft(&timo));
}
}
waiting = 0;
calltimeout();
if (got_sighup) {
kill_link = 1;
got_sighup = 0;
if (status != EXIT_HANGUP)
status = EXIT_USER_REQUEST;
}
if (got_sigterm) {
kill_link = 1;
persist = 0;
status = EXIT_USER_REQUEST;
got_sigterm = 0;
}
if (got_sigchld) {
reap_kids(0); /* Don't leave dead kids lying around */
got_sigchld = 0;
}
if (got_sigusr2) {
open_ccp_flag = 1;
got_sigusr2 = 0;
}
}
/*
* setup_signals - initialize signal handling.
*/
static void
setup_signals()
{
struct sigaction sa;
sigset_t mask;
/*
* 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(&mask);
sigaddset(&mask, SIGHUP);
sigaddset(&mask, SIGINT);
sigaddset(&mask, SIGTERM);
sigaddset(&mask, SIGCHLD);
sigaddset(&mask, 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 = mask;
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;
{
info("Using interface %s%d", PPP_DRV_NAME, ifunit);
slprintf(ifname, sizeof(ifname), "%s%d", PPP_DRV_NAME, ifunit);
script_setenv("IFNAME", ifname, iskey);
char *arg[3]={_PATH_SETPPPOEPID, ipparam, NULL}; // tallest 1219
run_program(_PATH_SETPPPOEPID,arg,0,0,0);
if (iskey) {
create_pidfile(); /* write pid to file */
create_linkpidfile();
}
}
/*
* detach - detach us from the controlling terminal.
*/
void
detach()
{
int pid;
char numbuf[16];
if (detached)
return;
if ((pid = fork()) < 0) {
error("Couldn't detach (fork failed: %m)");
die(1); /* or just return? */
}
if (pid != 0) {
/* parent */
exit(0); /* parent dies */
}
setsid();
chdir("/");
close(0);
close(1);
close(2);
detached = 1;
if (log_default)
log_to_fd = -1;
/* update pid files if they have been written already */
if (pidfilename[0])
create_pidfile();
if (linkpidfile[0])
create_linkpidfile();
slprintf(numbuf, sizeof(numbuf), "%d", getpid());
script_setenv("PPPD_PID", numbuf, 1);
}
/*
* reopen_log - (re)open our connection to syslog.
*/
void
reopen_log()
{
#ifdef ULTRIX
openlog("pppd", LOG_PID);
#else
#ifdef MPPPOE_SUPPORT
if(!strncmp(ipparam, "0", 1))
openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
else
openlog("pppd-1", LOG_PID | LOG_NDELAY, LOG_PPP);
#else
openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
#endif
setlogmask(LOG_UPTO(LOG_INFO));
#endif
}
/*
* Create a file containing our process ID.
*/
static void
create_pidfile()
{
FILE *pidfile;
slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid",
_PATH_VARRUN, ifname);
if ((pidfile = fopen(pidfilename, "w")) != NULL) {
fprintf(pidfile, "%d\n", getpid());
(void) fclose(pidfile);
} else {
error("Failed to create pid file %s: %m", pidfilename);
pidfilename[0] = 0;
}
}
static void
create_linkpidfile()
{
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", getpid());
if (ifname[0])
fprintf(pidfile, "%s\n", ifname);
(void) fclose(pidfile);
} else {
error("Failed to create 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);
}
/*
* get_input - called when incoming data is available.
*/
static void
get_input()
{
int len, i;
u_char *p;
u_short protocol;
struct protent *protp;
p = inpacket_buf; /* point to beginning of packet buffer */
len = read_packet(inpacket_buf);
if (len < 0)
return;
if (len == 0) {
notice("Modem hangup");
hungup = 1;
status = EXIT_HANGUP;
lcp_lowerdown(0); /* serial link is no longer available */
link_terminated(0);
return;
}
if (debug /*&& (debugflags & DBG_INPACKET)*/)
dbglog("rcvd %P", p, len);
if (len < PPP_HDRLEN) {
MAINDEBUG(("io(): Received short packet."));
return;
}
p += 2; /* Skip address and control */
GETSHORT(protocol, p);
len -= PPP_HDRLEN;
/*
* Toss all non-LCP packets unless LCP is OPEN.
*/
if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
MAINDEBUG(("get_input: Received non-LCP packet when LCP not open."));
return;
}
/*
* Until we get past the authentication phase, toss all packets
* except LCP, LQR and authentication packets.
*/
if (phase <= PHASE_AUTHENTICATE
&& !(protocol == PPP_LCP || protocol == PPP_LQR
|| protocol == PPP_PAP || protocol == PPP_CHAP)) {
MAINDEBUG(("get_input: discarding proto 0x%x in phase %d",
protocol, phase));
return;
}
/*
* Upcall the proper protocol input routine.
*/
for (i = 0; (protp = protocols[i]) != NULL; ++i) {
if (protp->protocol == protocol && protp->enabled_flag) {
(*protp->input)(0, p, len);
return;
}
if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
&& protp->datainput != NULL) {
(*protp->datainput)(0, p, len);
return;
}
}
if (debug) {
warn("Unsupported protocol 0x%x received", protocol);
}
lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
}
/*
* new_phase - signal the start of a new phase of pppd's operation.
*/
void
new_phase(p)
int p;
{
phase = p;
if (new_phase_hook)
(*new_phase_hook)(p);
}
/*
* die - clean up state and exit with the specified status.
*/
void
die(status)
int status;
{
char pppoe_errno[128]={0};
cleanup();
syslog(LOG_INFO, "Exit.");
//sc_cfg_set("ppp_status","ppp_disconnected"); //linxu
sscanf(pppoe_errno, "%d", status);
sc_cfg_set("pppoe_errno",pppoe_errno);
exit(status);
}
/*
* cleanup - restore anything which needs to be restored before we exit
*/
/* ARGSUSED */
static void
cleanup()
{
sys_cleanup();
if (fd_ppp >= 0)
the_channel->disestablish_ppp(devfd);
if (the_channel->cleanup)
(*the_channel->cleanup)();
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;
}
/*
* update_link_stats - get stats at link termination.
*/
void
update_link_stats(u)
int u;
{
struct timeval now;
char numbuf[32];
if (!get_ppp_stats(u, &link_stats)
|| my_gettimeofday(&now, NULL) < 0)
return;
link_connect_time = now.tv_sec - start_time.tv_sec;
link_stats_valid = 1;
slprintf(numbuf, sizeof(numbuf), "%d", link_connect_time);
script_setenv("CONNECT_TIME", numbuf, 0);
slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_out);
script_setenv("BYTES_SENT", numbuf, 0);
slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_in);
script_setenv("BYTES_RCVD", numbuf, 0);
}
struct callout {
struct timeval c_time; /* time at which to call routine */
void *c_arg; /* argument to routine */
void (*c_func) __P((void *)); /* routine */
struct callout *c_next;
};
static struct callout *callout = NULL; /* Callout list */
static struct timeval timenow; /* Current time */
/*
* timeout - Schedule a timeout.
*
* Note that this timeout takes the number of milliseconds, NOT hz (as in
* the kernel).
*/
void
timeout(func, arg, secs, usecs)
void (*func) __P((void *));
void *arg;
int secs, usecs;
{
struct callout *newp, *p, **pp;
// Compiler error
//MAINDEBUG(("Timeout %p:%p in %d.%03d seconds.", func, arg,
// time / 1000, time % 1000));
/*
* Allocate timeout.
*/
if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
fatal("Out of memory in timeout()!");
newp->c_arg = arg;
newp->c_func = func;
my_gettimeofday(&timenow, NULL);
newp->c_time.tv_sec = timenow.tv_sec + secs;
newp->c_time.tv_usec = timenow.tv_usec + usecs;
if (newp->c_time.tv_usec >= 1000000) {
newp->c_time.tv_sec += newp->c_time.tv_usec / 1000000;
newp->c_time.tv_usec %= 1000000;
}
/*
* Find correct place and link it in.
*/
for (pp = &callout; (p = *pp); pp = &p->c_next)
if (newp->c_time.tv_sec < p->c_time.tv_sec
|| (newp->c_time.tv_sec == p->c_time.tv_sec
&& newp->c_time.tv_usec < p->c_time.tv_usec))
break;
newp->c_next = p;
*pp = newp;
}
/*
* untimeout - Unschedule a timeout.
*/
void
untimeout(func, arg)
void (*func) __P((void *));
void *arg;
{
struct callout **copp, *freep;
MAINDEBUG(("Untimeout %p:%p.", func, arg));
/*
* Find first matching timeout and remove it from the list.
*/
for (copp = &callout; (freep = *copp); copp = &freep->c_next)
if (freep->c_func == func && freep->c_arg == arg) {
*copp = freep->c_next;
free((char *) freep);
break;
}
}
/*
* calltimeout - Call any timeout routines which are now due.
*/
static void
calltimeout()
{
struct callout *p;
while (callout != NULL) {
p = callout;
if (my_gettimeofday(&timenow, NULL) < 0)
fatal("Failed to get time of day: %m");
if (!(p->c_time.tv_sec < timenow.tv_sec
|| (p->c_time.tv_sec == timenow.tv_sec
&& p->c_time.tv_usec <= timenow.tv_usec)))
break; /* no, it's not time yet */
callout = p->c_next;
(*p->c_func)(p->c_arg);
free((char *) p);
}
}
/*
* timeleft - return the length of time until the next timeout is due.
*/
static struct timeval *
timeleft(tvp)
struct timeval *tvp;
{
if (callout == NULL)
return NULL;
my_gettimeofday(&timenow, NULL);
tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
if (tvp->tv_usec < 0) {
tvp->tv_usec += 1000000;
tvp->tv_sec -= 1;
}
if (tvp->tv_sec < 0)
tvp->tv_sec = tvp->tv_usec = 0;
return tvp;
}
/*
* kill_my_pg - send a signal to our process group, and ignore it ourselves.
*/
static void
kill_my_pg(sig)
int sig;
{
struct sigaction act, oldact;
act.sa_handler = SIG_IGN;
act.sa_flags = 0;
kill(0, sig);
sigaction(sig, &act, &oldact);
sigaction(sig, &oldact, NULL);
}
/*
* hup - Catch SIGHUP signal.
*
* Indicates that the physical layer has been disconnected.
* We don't rely on this indication; if the user has sent this
* signal, we just take the link down.
*/
static void
hup(sig)
int sig;
{
info("Hangup (SIGHUP)");
got_sighup = 1;
if (conn_running)
/* Send the signal to the [dis]connector process(es) also */
kill_my_pg(sig);
if (waiting)
siglongjmp(sigjmp, 1);
}
/*
* term - Catch SIGTERM signal and SIGINT signal (^C/del).
*
* Indicates that we should initiate a graceful disconnect and exit.
*/
/*ARGSUSED*/
static void
term(sig)
int sig;
{
info("Terminating on signal %d.", sig);
got_sigterm = 1;
if (conn_running)
/* Send the signal to the [dis]connector process(es) also */
kill_my_pg(sig);
if (waiting)
siglongjmp(sigjmp, 1);
}
/*
* chld - Catch SIGCHLD signal.
* Sets a flag so we will call reap_kids in the mainline.
*/
static void
chld(sig)
int sig;
{
got_sigchld = 1;
if (waiting)
siglongjmp(sigjmp, 1);
}
/*
* toggle_debug - Catch SIGUSR1 signal.
*
* Toggle debug flag.
*/
/*ARGSUSED*/
static void
toggle_debug(sig)
int sig;
{
debug = !debug;
if (debug) {
setlogmask(LOG_UPTO(LOG_DEBUG));
} else {
setlogmask(LOG_UPTO(LOG_WARNING));
}
}
/*
* open_ccp - Catch SIGUSR2 signal.
*
* Try to (re)negotiate compression.
*/
/*ARGSUSED*/
static void
open_ccp(sig)
int sig;
{
got_sigusr2 = 1;
if (waiting)
siglongjmp(sigjmp, 1);
}
/*
* bad_signal - We've caught a fatal signal. Clean up state and exit.
*/
static void
bad_signal(sig)
int sig;
{
static int crashed = 0;
if (crashed)
_exit(127);
crashed = 1;
error("Fatal signal %d", sig);
if (conn_running)
kill_my_pg(SIGTERM);
die(127);
}
/*
* run-program - execute a program with given arguments,
* but don't wait for it.
* If the program can't be executed, logs an error unless
* must_exist is 0 and the program file doesn't exist.
* Returns -1 if it couldn't fork, 0 if the file doesn't exist
* or isn't an executable plain file, or the process ID of the child.
* If done != NULL, (*done)(arg) will be called later (within
* reap_kids) iff the return value is > 0.
*/
pid_t
run_program(prog, args, must_exist, done, arg)
char *prog;
char **args;
int must_exist;
void (*done) __P((void *));
void *arg;
{
int pid;
struct stat sbuf;
/*
* First check if the file exists and is executable.
* We don't use access() because that would use the
* real user-id, which might not be root, and the script
* might be accessible only to root.
*/
errno = EINVAL;
if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode)
|| (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) {
if (must_exist || errno != ENOENT)
warn("Can't execute %s: %m", prog);
return 0;
}
pid = fork();
if (pid == -1) {
error("Failed to create child process for %s: %m", prog);
return -1;
}
if (pid == 0) {
int new_fd;
/* Leave the current location */
(void) setsid(); /* No controlling tty. */
(void) umask (S_IRWXG|S_IRWXO);
(void) chdir ("/"); /* no current directory. */
setuid(0); /* set real UID = root */
setgid(getegid());
/* Ensure that nothing of our device environment is inherited. */
sys_close();
closelog();
close (0);
close (1);
close (2);
if (the_channel->close)
(*the_channel->close)();
/* Don't pass handles to the PPP device, even by accident. */
new_fd = open (_PATH_DEVNULL, O_RDWR);
if (new_fd >= 0) {
if (new_fd != 0) {
dup2 (new_fd, 0); /* stdin <- /dev/null */
close (new_fd);
}
dup2 (0, 1); /* stdout -> /dev/null */
dup2 (0, 2); /* stderr -> /dev/null */
}
#ifdef BSD
/* Force the priority back to zero if pppd is running higher. */
if (setpriority (PRIO_PROCESS, 0, 0) < 0)
warn("can't reset priority to 0: %m");
#endif
/* SysV recommends a second fork at this point. */
/* run the program */
execve(prog, args, script_env);
if (must_exist || errno != ENOENT) {
/* have to reopen the log, there's nowhere else
for the message to go. */
reopen_log();
syslog(LOG_ERR, "Can't execute %s: %m", prog);
closelog();
}
_exit(-1);
}
if (debug)
dbglog("Script %s started (pid %d)", prog, pid);
record_child(pid, prog, done, arg);
return pid;
}
/*
* record_child - add a child process to the list for reap_kids
* to use.
*/
void
record_child(pid, prog, done, arg)
int pid;
char *prog;
void (*done) __P((void *));
void *arg;
{
struct subprocess *chp;
++n_children;
chp = (struct subprocess *) malloc(sizeof(struct subprocess));
if (chp == NULL) {
warn("losing track of %s process", prog);
} else {
chp->pid = pid;
chp->prog = prog;
chp->done = done;
chp->arg = arg;
chp->next = children;
children = chp;
}
}
/*
* reap_kids - get status from any dead child processes,
* and log a message for abnormal terminations.
*/
static int
reap_kids(waitfor)
int waitfor;
{
int pid, status;
struct subprocess *chp, **prevp;
if (n_children == 0)
return 0;
while ((pid = waitpid(-1, &status, (waitfor? 0: WNOHANG))) != -1
&& pid != 0) {
for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) {
if (chp->pid == pid) {
--n_children;
*prevp = chp->next;
break;
}
}
if (WIFSIGNALED(status)) {
warn("Child process %s (pid %d) terminated with signal %d",
(chp? chp->prog: "??"), pid, WTERMSIG(status));
} else if (debug)
dbglog("Script %s finished (pid %d), status = 0x%x",
(chp? chp->prog: "??"), pid, status);
if (chp && chp->done)
(*chp->done)(chp->arg);
if (chp)
free(chp);
}
if (pid == -1) {
if (errno == ECHILD)
return -1;
if (errno != EINTR)
error("Error waiting for child process: %m");
}
return 0;
}
/*
* script_setenv - set an environment variable value to be used
* for scripts that we run (e.g. ip-up, auth-up, etc.)
*/
void
script_setenv(var, value, iskey)
char *var, *value;
int iskey;
{
size_t varl = strlen(var);
size_t vl = varl + strlen(value) + 2;
int i;
char *p, *newstring;
newstring = (char *) malloc(vl+1);
if (newstring == 0)
return;
*newstring++ = iskey;
slprintf(newstring, vl, "%s=%s", var, value);
/* check if this variable is already set */
if (script_env != 0) {
for (i = 0; (p = script_env[i]) != 0; ++i) {
if (strncmp(p, var, varl) == 0 && p[varl] == '=') {
if (p[-1] && pppdb != NULL)
delete_db_key(p);
free(p-1);
script_env[i] = newstring;
if (iskey && pppdb != NULL)
add_db_key(newstring);
update_db_entry();
return;
}
}
} else {
/* no space allocated for script env. ptrs. yet */
i = 0;
script_env = (char **) malloc(16 * sizeof(char *));
if (script_env == 0)
return;
s_env_nalloc = 16;
}
/* reallocate script_env with more space if needed */
if (i + 1 >= s_env_nalloc) {
int new_n = i + 17;
char **newenv = (char **) realloc((void *)script_env,
new_n * sizeof(char *));
if (newenv == 0)
return;
script_env = newenv;
s_env_nalloc = new_n;
}
script_env[i] = newstring;
script_env[i+1] = 0;
if (pppdb != NULL) {
if (iskey)
add_db_key(newstring);
update_db_entry();
}
}
/*
* script_unsetenv - remove a variable from the environment
* for scripts.
*/
void
script_unsetenv(var)
char *var;
{
int vl = strlen(var);
int i;
char *p;
if (script_env == 0)
return;
for (i = 0; (p = script_env[i]) != 0; ++i) {
if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
if (p[-1] && pppdb != NULL)
delete_db_key(p);
free(p-1);
while ((script_env[i] = script_env[i+1]) != 0)
++i;
break;
}
}
if (pppdb != NULL)
update_db_entry();
}