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/*
* diald.c - Demand dialing daemon for ppp.
*
* Copyright (c) 1994, 1995, 1996 Eric Schenk.
* Copyright (c) 1999 Mike Jagdis.
* All rights reserved. Please see the file LICENSE which should be
* distributed with this software for terms of use.
*
* Portions of this code were derived from the code for pppd copyright
* (c) 1989 Carnegie Mellon University. The copyright notice on this code
* is reproduced below.
*
* 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.
*/
#include "diald.h"
#include "version.h"
#ifdef TCP_WRAPPERS
# include <tcpd.h>
int allow_severity = LOG_INFO;
int deny_severity = LOG_NOTICE;
#endif
/* intialized variables. */
int af_packet = 1; /* kernel has AF_PACKET sockets */
int modem_fd = -1; /* modem device fp (for proxy reads) */
MONITORS *monitors = 0; /* Monitor pipes */
PIPE *pipes = 0; /* Command pipes */
int modem_hup = 0; /* have we seen a modem HUP? */
int sockfd = -1; /* socket for doing interface ioctls */
int delayed_quit = 0; /* has the user requested a delayed quit? */
int request_down = 0; /* has the user requested link down? */
int request_up = 0; /* has the user requested link down? */
int forced = 0; /* has the user requested the link forced up? */
int link_pid = 0; /* current protocol control command pid */
int dial_pid = 0; /* current dial command pid */
int running_pid = 0; /* current system command pid */
int running_status = 0; /* status of last system command */
int dial_status = 0; /* status from last dial command */
int state_timeout = -1; /* state machine timeout counter */
int proxy_ifunit = 0; /* Interface for the proxy */
int link_iface = -1; /* Interface for the link */
int force_dynamic = 0; /* true if connect passed back an addr */
int redial_rtimeout = -1; /* initialized value */
int dial_failures = 0; /* count of dialing failures */
int ppp_half_dead = 0; /* is the ppp link half dead? */
int terminate = 0;
char *pidfile = 0;
static PIPE *fifo_pipe;
int argc_save;
char **argv_save;
proxy_t proxy;
void do_config(void)
{
#ifdef SCHED_OTHER
struct sched_param sp;
#endif
if (deinitializer) {
if (devices && devices[0])
setenv("MODEM", devices[0], 1);
run_shell(SHELL_WAIT, "deinit", deinitializer, -1);
}
init_vars();
flush_prules();
flush_vars();
flush_filters();
/* Get the default defs and config files first */
parse_options_file(DIALD_DEFS_FILE);
parse_options_file(DIALD_CONFIG_FILE);
/* Get the command line modifications */
parse_args(argc_save-1,argv_save+1);
/* Do validity checks on the setup */
check_setup();
orig_local_ip = (local_ip ? strdup(local_ip) : NULL);
orig_remote_ip = (remote_ip ? strdup(remote_ip) : NULL);
orig_broadcast_ip = (broadcast_ip ? strdup(broadcast_ip) : NULL);
if (initializer) {
if (devices && devices[0])
setenv("MODEM", devices[0], 1);
run_shell(SHELL_WAIT, "init", initializer, -1);
}
#ifdef SCHED_OTHER
sp.sched_priority = (scheduler == SCHED_OTHER ? 0 : priority);
sched_setscheduler(0, scheduler, &sp);
if (scheduler == SCHED_OTHER)
#endif
#ifdef PRIO_PROCESS
setpriority(PRIO_PROCESS, 0, priority);
#else
nice(priority - nice(0));
#endif
}
int
main(int argc, char *argv[])
{
int sel;
struct timeval timeout;
fd_set readfds;
long tstamp = ticks();
long ts;
/* This fixes a problem with diald using UTC in log messages
* rather than local time. I do not believe this call should
* be necessary. It may be library version dependent.
*/
tzset();
if (argc > 1
&& (!strcmp(argv[1], "-V") || !strcmp(argv[1], "-v")
|| !strcmp(argv[1], "--version"))) {
printf("Diald version %s\n", VERSION);
exit(0);
}
argc_save = argc;
argv_save = argv;
/* initialize system log interface */
openlog("diald", LOG_PID | LOG_NDELAY, LOG_LOCAL2);
/* initialize a firewall unit so we can store our options */
/* If I get things into a device this should be an "open" */
fwunit = ctl_firewall(IP_FW_OPEN,0);
parse_init();
/* Get an internet socket for doing socket ioctls. */
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sockfd < 0) {
syslog(LOG_ERR, "Couldn't create IP socket: %m");
die(1);
}
fcntl(sockfd, F_SETFD, FD_CLOEXEC);
if (debug&DEBUG_VERBOSE)
syslog(LOG_INFO,"Starting diald version %s",VERSION);
signal_setup();
do_config();
become_daemon();
FD_ZERO(&ctrl_fds);
open_fifo();
filter_setup();
proxy_init(&proxy, proxyif);
if (proxy.start) proxy.start(&proxy);
idle_filter_proxy();
/* We are a session manager and currently have no controlling
* terminal (this will be the modem tty when open).
*/
setpgid(0, getppid());
setsid();
if (debug&DEBUG_VERBOSE)
mon_syslog(LOG_INFO,"Diald initial setup completed.");
/* main loop */
while (!terminate) {
/* wait up to a second for an event */
readfds = ctrl_fds;
if (proxy.fd >= 0) FD_SET(proxy.fd, &readfds);
if (snoopfd >= 0) FD_SET(snoopfd, &readfds);
/* Compute the likely timeout for the next second boundary */
ts = tstamp + PAUSETIME*CLOCKS_PER_SEC - ticks();
if (ts < 0) ts = 0;
timeout.tv_sec = ts/CLOCKS_PER_SEC;
timeout.tv_usec = 1000*(ts%CLOCKS_PER_SEC)/CLOCKS_PER_SEC;
sel = select(256,&readfds,0,0,&timeout);
if (sel < 0 && errno == EBADF) {
PIPE *p;
/* Yuk, one of the pipes is probably broken. It seems to
* happen on unnamed pipes created with pipe(). Named
* pipes used by dctrl etc. seem ok.
* Is this correct select behaviour or is it a bug either
* in the kernel or glibc?
*/
p = pipes;
while (p) {
PIPE *tmp = p->next;
if (!(p->access & ACCESS_CONTROL))
ctrl_read(p);
p = tmp;
}
} else if (sel > 0) {
PIPE *p;
if (tcp_fd != -1) {
if (FD_ISSET(tcp_fd,&readfds)) {
struct sockaddr_in sa;
int flags, len, fd;
flags = fcntl(tcp_fd, F_GETFL, 0);
fcntl(tcp_fd, F_SETFL, flags|O_NONBLOCK);
len = sizeof(sa);
fd = accept(tcp_fd, (struct sockaddr *)&sa, &len);
fcntl(tcp_fd, F_SETFL, flags);
if (fd >= 0) {
PIPE *p;
#ifdef TCP_WRAPPERS
struct request_info rq;
request_init(&rq,
RQ_DAEMON, "diald",
RQ_FILE, fd,
0);
fromhost(&rq);
if (!hosts_access(&rq)) {
close(fd);
mon_syslog(LOG_WARNING,
"Connection from TCP %s:%d - DENIED",
inet_ntoa(sa.sin_addr), sa.sin_port);
} else
#endif
if ((p = malloc(sizeof(PIPE)))) {
char def[] = "simple default";
char buf[1024];
int n;
fcntl(fd, F_SETFD, FD_CLOEXEC);
n = snprintf(buf, sizeof(buf)-2, "TCP %s:%d",
inet_ntoa(sa.sin_addr), sa.sin_port);
buf[n] = '\0';
pipe_init(strdup(buf), ctrl_access(def),
fd, p, 0);
FD_SET(fd, &ctrl_fds);
mon_syslog(LOG_NOTICE, "Connection from %s", buf);
} else {
close(fd);
mon_syslog(LOG_ERR, "malloc: %m");
}
} else
mon_syslog(LOG_ERR, "accept: %m");
}
}
p = pipes;
while (p) {
PIPE *tmp = p->next;
if (FD_ISSET(p->fd, &readfds))
ctrl_read(p);
p = tmp;
}
/* update the connection filters */
if (snoopfd >= 0
&& FD_ISSET(snoopfd, &readfds))
filter_read();
/* deal with packets coming into the pty proxy link */
if (proxy.fd >= 0
&& FD_ISSET(proxy.fd, &readfds))
proxy_read();
}
/* check if ticks() has advanced a second since last check.
* This is immune to wall clock skew because we use the ticks count.
*/
ts = tstamp + PAUSETIME*CLOCKS_PER_SEC - ticks();
if (ts <= 0) {
tstamp = ticks();
fire_timers();
/* Advance a second on state machine timeouts.
* Under high load this can get stretched out.
* Even under low load it is likely to have 1% error.
* This doesn't bother me enough to bother changing things.
*/
if (state_timeout > 0) state_timeout--;
if (debug&DEBUG_TICK)
mon_syslog(LOG_DEBUG,"--- tick --- state %d block %d state_timeout %d",state,blocked,state_timeout);
monitor_queue();
}
change_state();
}
die(0);
return 0;
}
/*
* Change into a daemon.
* Get rid of the stdio streams, and disassociate from the original
* controling terminal, and become a group leader.
*/
void become_daemon()
{
int pid;
FILE *fp;
if (daemon_flag) {
close(0);
close(1);
close(2);
/* go into the background */
if ((pid = fork()) < 0) {
syslog(LOG_ERR,"Could not fork into background: %m");
die(1);
}
/* parent process is finished */
if (pid != 0) exit(0);
}
pidfile = malloc(strlen(run_prefix) + strlen(pidlog) + 2);
sprintf(pidfile,"%s/%s",run_prefix,pidlog);
if ((fp = fopen(pidfile,"w")) != NULL) {
fprintf(fp,"%d\n",getpid());
fclose(fp);
} else {
syslog(LOG_ERR,"Unable to create run file %s: %m",pidfile);
}
}
/* Open the command fifo, if any */
void open_fifo()
{
struct stat sbuf;
if (fifoname) {
if (stat(fifoname,&sbuf) < 0 || !(sbuf.st_mode&S_IFIFO)) {
syslog(LOG_INFO,"Creating FIFO");
/* Create the fifo. */
mknod(fifoname, S_IFIFO|0277, 0);
chmod(fifoname, 0600);
}
/* We need to open this RDWR to make select() work the
* way we want in kernels after 1.3.81. In particular
* we don't want select() to return 1 whenever there
* are no writers on the remote side of the command fifo.
* This guarantees that there is always at least one writer...
*/
if ((fifo_fd = open(fifoname, O_RDWR)) >= 0) {
fcntl(fifo_fd, F_SETFD, FD_CLOEXEC);
fifo_pipe = (PIPE *)malloc(sizeof(PIPE));
if (fifo_pipe) {
if (debug&DEBUG_VERBOSE)
syslog(LOG_INFO,"Using fifo %s",fifoname);
pipe_init("FIFO", 0x7fffffff, fifo_fd, fifo_pipe, 1);
FD_SET(fifo_fd, &ctrl_fds);
} else {
syslog(LOG_ERR,"Could not open fifo pipe %m");
fifo_fd = -1;
}
} else {
syslog(LOG_ERR,"Could not open fifo file %s",fifoname);
fifo_fd = -1;
}
} else {
/* make sure to invalidate the fifo_fd if we don't open one. */
fifo_fd = -1;
}
if (tcpport) {
if ((tcp_fd = socket(AF_INET, SOCK_STREAM, 0)) >= 0) {
struct sockaddr_in sa;
int opt = 1;
setsockopt(tcp_fd, SOL_SOCKET, SO_REUSEADDR,
(void *)&opt, sizeof(opt));
fcntl(tcp_fd, F_SETFD, FD_CLOEXEC);
sa.sin_family = AF_INET;
sa.sin_addr.s_addr = INADDR_ANY;
sa.sin_port = htons(tcpport);
if (!bind(tcp_fd, (struct sockaddr *)&sa, sizeof(sa))
&& !listen(tcp_fd, 5)) {
if (debug&DEBUG_VERBOSE)
syslog(LOG_INFO,"Using TCP port %d", tcpport);
FD_SET(tcp_fd, &ctrl_fds);
} else {
close(tcp_fd);
tcp_fd = -1;
}
}
if (tcp_fd < 0) {
syslog(LOG_ERR,"Could not open TCP socket: %m");
tcp_fd = -1;
}
} else {
tcp_fd = -1;
}
}
/*
* Set up the signal handlers.
*/
static sigset_t sig_mask;
void signal_setup()
{
struct sigaction sa;
/* set up signal handlers */
sigemptyset(&sig_mask);
sigaddset(&sig_mask, SIGHUP);
sigaddset(&sig_mask, SIGINT);
sigaddset(&sig_mask, SIGTERM);
sigaddset(&sig_mask, SIGUSR1);
sigaddset(&sig_mask, SIGUSR2);
sigaddset(&sig_mask, SIGCHLD);
sigaddset(&sig_mask, SIGPIPE);
#define SIGNAL(s, handler) { \
sa.sa_handler = handler; \
if (sigaction(s, &sa, NULL) < 0) { \
mon_syslog(LOG_ERR, "sigaction(%d): %m", s); \
die(1); \
} \
}
memset(&sa, 0, sizeof(sa));
sa.sa_mask = sig_mask;
sa.sa_flags = 0;
SIGNAL(SIGHUP, sig_hup); /* Hangup: modem went down. */
SIGNAL(SIGINT, sig_intr); /* Interrupt: take demand dialer down */
SIGNAL(SIGUSR1, linkup); /* User requests the link to go up */
SIGNAL(SIGUSR2, print_filter_queue); /* dump the packet queue to the log */
SIGNAL(SIGPIPE, SIG_IGN);
SIGNAL(SIGTERM, sig_term); /* Terminate: user take link down */
SIGNAL(SIGCHLD, sig_chld); /* reap dead kids */
SIGNAL(SIGTTOU, SIG_IGN);
}
static int signal_block_depth = 0;
void block_signals()
{
if (signal_block_depth++ == 0)
sigprocmask(SIG_BLOCK, &sig_mask, NULL);
}
void unblock_signals()
{
if (--signal_block_depth == 0)
sigprocmask(SIG_UNBLOCK, &sig_mask, NULL);
}
void default_sigacts()
{
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_mask = sig_mask;
sa.sa_flags = 0;
SIGNAL(SIGHUP, SIG_DFL);
SIGNAL(SIGINT, SIG_DFL);
SIGNAL(SIGTERM, SIG_DFL);
SIGNAL(SIGUSR1, SIG_DFL);
SIGNAL(SIGUSR2, SIG_DFL);
SIGNAL(SIGCHLD, SIG_DFL);
SIGNAL(SIGPIPE, SIG_DFL);
SIGNAL(SIGTTOU, SIG_DFL);
}
/*
* Get a pty and open both the slave and master sides.
*/
void get_pty(int *mfd, int *sfd)
{
char *ptys = "0123456789abcdef";
int i,c;
static char buf[128];
/* FIXME: this is a crudy way to find a pty.
*/
for (c = 'p'; c <= 's'; c++)
for (i = 0; i < 16; i++) {
sprintf(buf,"/dev/pty%c%c",c,ptys[i]);
if ((*mfd = open(buf,O_RDWR)) >= 0) {
sprintf(buf,"/dev/tty%c%c",c,ptys[i]);
if ((*sfd = open(buf,O_RDWR|O_NOCTTY|O_NDELAY)) < 0) {
syslog(LOG_ERR,"Can't open slave side of pty: %m");
die(1);
}
return;
}
}
syslog(LOG_ERR,"No pty found in range pty[p-s][0-9a-f]\n");
die(1);
}
/* Read a request from the command pipe.
* Valid requests are:
* config - modify diald configuration.
* block - block diald from calling out.
* unblock - unblock diald from calling out.
* down - bring the link down.
* up - bring the link up.
* delayed-quit - quit next time diald is idle.
* quit - stop diald in its tracks.
* queue - dump the filter queue.
* debug level - set the debug level.
* force - force diald to put the connection up and keep it up.
* unforce - remove the forced up requirement.
* connect pid dev - go up on a connection to the named port.
* We assume the connection negotiations are
* already finished and any lock files are in place.
* When the connection should be killed we send a
* SIGTERM to the given pid.
* dynamic <lip> <rip> - pass back dynamic IP config info to diald.
* message <txt> - set the message text from the connect script.
* monitor file - start a monitoring program.
* reset - reread the configuration information.
*/
void ctrl_read(PIPE *pipe)
{
int i;
int pid, dev, j,k,l = 0;
char *buf, *tail;
i = pipe_read(pipe);
buf = tail = pipe->buf;
if (i < 0) {
PIPE **tmp;
FD_CLR(pipe->fd, &ctrl_fds);
close(pipe->fd);
tmp = &pipes;
while (*tmp) {
if (pipe == *tmp) {
*tmp = pipe->next;
free(pipe);
break;
}
tmp = &(*tmp)->next;
}
return;
}
if (i == 0) return;
while (i--) {
if (*tail == '\n' || *tail == '\r') {
*tail = '\0';
/* Ok, we've got a line, now we need to "parse" it. */
if (!*buf) {
/* Empty line. Probably \r\n? */
} else if (!(pipe->access & ACCESS_CONTROL)) {
/* Not a control pipe - just messages from a script */
mon_syslog(LOG_INFO, "%s: %s", pipe->name, buf);
} else if (strncmp(buf, "auth ", 5) == 0) {
if (!(pipe->access & ACCESS_AUTH)) {
mon_syslog(LOG_NOTICE, "%s: ignored auth request",
pipe->name);
} else {
pipe->access = ctrl_access(buf+5);
mon_syslog(LOG_NOTICE, "%s: new access 0x%08x",
pipe->name, pipe->access);
}
} else if ((pipe->access & ACCESS_CONFIG)
&& strncmp(buf, "config ", 7) == 0) {
mon_syslog(LOG_NOTICE, "%s: %s", pipe->name, buf);
parse_options_line(buf+7);
} else if ((pipe->access & ACCESS_DEMAND)
&& strcmp(buf,"demand") == 0) {
mon_syslog(LOG_NOTICE, "%s: demand enable request",
pipe->name);
parse_options_line(buf);
} else if ((pipe->access & ACCESS_NODEMAND)
&& strcmp(buf,"nodemand") == 0) {
mon_syslog(LOG_NOTICE, "%s: demand disable request",
pipe->name);
parse_options_line(buf);
} else if ((pipe->access & ACCESS_BLOCK)
&& strcmp(buf,"block") == 0) {
mon_syslog(LOG_NOTICE, "%s: block request", pipe->name);
parse_options_line(buf);
request_down = 1;
request_up = 0;
} else if ((pipe->access & ACCESS_UNBLOCK)
&& strcmp(buf,"unblock") == 0) {
mon_syslog(LOG_NOTICE, "%s: unblock request", pipe->name);
parse_options_line(buf);
} else if ((pipe->access & ACCESS_FORCE)
&& strcmp(buf,"force") == 0) {
mon_syslog(LOG_NOTICE, "%s: force request", pipe->name);
forced = 1;
} else if ((pipe->access & ACCESS_UNFORCE)
&& strcmp(buf,"unforce") == 0) {
mon_syslog(LOG_NOTICE, "%s: unforce request", pipe->name);
forced = 0;
} else if ((pipe->access & ACCESS_DOWN)
&& strcmp(buf,"down") == 0) {
mon_syslog(LOG_NOTICE, "%s: link down request", pipe->name);
request_down = 1;
request_up = 0;
} else if ((pipe->access & ACCESS_UP)
&& strcmp(buf,"up") == 0) {
mon_syslog(LOG_NOTICE, "%s: link up request", pipe->name);
request_down = 0;
request_up = 1;
} else if ((pipe->access & ACCESS_DELQUIT)
&& strcmp(buf,"delayed-quit") == 0) {
mon_syslog(LOG_NOTICE, "%s: delayed termination request", pipe->name);
delayed_quit = 1;
} else if ((pipe->access & ACCESS_QUIT)
&& strcmp(buf,"quit") == 0) {
mon_syslog(LOG_NOTICE, "%s: termination request", pipe->name);
terminate = 1;
} else if ((pipe->access & ACCESS_RESET)
&& strcmp(buf,"reset") == 0) {
mon_syslog(LOG_NOTICE, "%s: reset request received - re-reading configuration", pipe->name);
do_config();
} else if ((pipe->access & ACCESS_QUEUE)
&& strcmp(buf,"queue") == 0) {
struct firewall_req req;
mon_syslog(LOG_NOTICE,"%s: user requested dump of firewall queue", pipe->name);
mon_syslog(LOG_DEBUG,"--------------------------------------");
req.unit = fwunit;
ctl_firewall(IP_FW_PCONN,&req);
mon_syslog(LOG_DEBUG,"--------------------------------------");
} else if ((pipe->access & ACCESS_DEBUG)
&& sscanf(buf,"debug %i", &pid) == 1) {
mon_syslog(LOG_NOTICE,"%s: changing debug flags to 0x%x",
pipe->name, pid);
debug = pid;
} else if ((pipe->access & ACCESS_DYNAMIC)
&& (sscanf(buf,"dynamic %n%*s%n %n",&j,&k,&l) >= 0) && l) {
buf[k] = 0;
if (inet_addr(buf+j) == (unsigned long)0xffffffff
|| inet_addr(buf+l) == (unsigned long)0xffffffff) {
mon_syslog(LOG_ERR,"%s: bad parameters '%s' and '%s' to dynamic command ignored",
pipe->name, buf+j, buf+l);
} else {
if (local_ip) free(local_ip);
local_ip = strdup(buf+j);
if (remote_ip) free(remote_ip);
remote_ip = strdup(buf+l);
force_dynamic = 1;
}
} else if ((pipe->access & ACCESS_MONITOR)
&& strncmp(buf,"monitor", 7) == 0) {
struct stat sbuf;
int fd;
MONITORS *new;
k = 0;
if (sscanf(buf,"monitor %i %n",&j,&k) == 1) {
mon_syslog(LOG_NOTICE, "%s: log level 0x%08x", buf + k, j);
} else if (buf[7] != 0 && buf[7] == ' ') {
mon_syslog(LOG_NOTICE, "%s: full monitor connection", buf+8);
j = 0x060000ff; /* Heavy weight connection requested */
k = 8;
}
if (k >= 8) {
/* Check list to see if this is just a status change */
block_signals(); /* don't let anything mess up the data */
new = monitors;
while (new) {
if (strcmp(new->name,buf+k) == 0) {
new->level = j;
output_state();
break;
}
new = new->next;
}
if (!new) {
if (pipe == fifo_pipe
&& (stat(fifoname,&sbuf) < 0 || !sbuf.st_mode&S_IFIFO)) {
mon_syslog(LOG_ERR, "%s: %s not a pipe",
pipe->name, buf+k);
} else if ((pipe != fifo_pipe && (fd=dup(pipe->fd)) < 0)
|| (pipe == fifo_pipe && (fd = open(buf+k,O_WRONLY|O_NDELAY))<0)) {
mon_syslog(LOG_ERR, "%s: could not open pipe %s: %m",
pipe->name, buf+k);
} else {
struct firewall_req req;
fcntl(fd, F_SETFD, FD_CLOEXEC);
new = (MONITORS *)malloc(sizeof(MONITORS));
new->name = strdup(buf+k);
new->next = monitors;
new->fd = fd;
new->level = j;
if (!monitors) ctl_firewall(IP_FW_MCONN_INIT,&req);
monitors = new;
req.unit = fwunit;
output_state();
}
}
unblock_signals();
} else {
mon_syslog(LOG_INFO, "%s: empty monitor request ignored",
pipe->name);
}
} else if ((pipe->access & ACCESS_MESSAGE)
&& strncmp(buf,"message ",8) == 0) {
/* pass a message from the connector on to the monitor */
if (monitors) {
mon_write(MONITOR_MESSAGE,"MESSAGE\n",8);
mon_write(MONITOR_MESSAGE,buf+8,strlen(buf+8));
mon_write(MONITOR_MESSAGE,"\n",1);
}
} else if ((pipe->access & ACCESS_CONNECT)
&& sscanf(buf,"connect %d %n", &pid, &dev) == 1) {
#if 0
/* XXX */mon_syslog(LOG_INFO,"%s: up request on %s state=%d, dial=%d, dev=%s", pipe->name, buf+dev, state, dial_pid, current_dev ? current_dev : "none");
#endif
/* Damn ISDN has no blocking dial. If we get a request up
* where the request device matches the current device we
* ignore it. (Perhaps we should take it as a dial
* completion?)
*/
if (state == STATE_CONNECT && current_dev
&& !strcmp(current_dev, buf+dev)) {
mon_syslog(LOG_INFO, "%s: link up request on current device ignored",
pipe->name);
} else if ((state != STATE_DOWN && state != STATE_CLOSE
&& !give_way)
|| state==STATE_UP || req_pid) {
/* somebody else already has this diald, tell 'em */
if (pid) kill(pid, SIGTERM);
mon_syslog(LOG_INFO, "%s: link up requested but denied",
pipe->name);
} else {
req_pid = pid;
req_dev = (char *)malloc(tail-(buf+dev)+1);
if (req_dev == 0) {
req_pid = 0;
mon_syslog(LOG_ERR, "%s: no memory to store requested devce!",
pipe->name);
} else {
strcpy(req_dev, buf+dev);
request_down = 0;
request_up = 1;
mon_syslog(LOG_INFO, "%s: link up requested on device %s",
pipe->name, req_dev);
}
}
} else {
mon_syslog(LOG_ERR,"%s: Ignored request '%s'",
pipe->name, buf);
}
buf = tail+1;
}
tail++;
}
pipe_flush(pipe, buf-pipe->buf);
}
/*
* Deal with master side packet on the SLIP link.
*/
void proxy_read()
{
int len;
char buffer[4096];
/* read the SLIP packet */
len = recv_packet(buffer,4096);
if (len == 0)
return;
/* If we get here with the link up and fwdfd not -1,
* and we are rerouting, then it must be
* that the external interface has gone down without
* taking the link with it, and as a result our route
* to the external interface got lost. (This CAN legally
* happen with PPP). In this case we buffer the packet so
* we can retransmit it when the link comes back up.
* OR
* the kernel is retransmitting something through sl0, despite
* the existance of a route through another device...
*/
/* if the external iface is up then probably we can send it on */
if (link_iface != -1 && fwdfd != -1) {
int dlen;
struct sockaddr_pkt sp;
#ifdef HAVE_AF_PACKET
struct sockaddr_ll sl;
#endif
struct sockaddr *to;
size_t to_len;
/* Make sure we try to restore the link to working condition now... */
if (current_mode == MODE_PPP) {
/* Check if a route exists at this point through the ppp device. */
/* If not then we must be half dead. */
if (!ppp_route_exists()) {
/* The external iface is down, buffer the packet so we can
* forward it when the iface comes up.
*/
ppp_half_dead = 1;
if (buffer_packets)
buffer_packet(len,buffer);
return;
}
}
/* Ok, the interface is there, and the route is up,
* so just send it on. This can happen when routing is switched
* in the middle of a retransmission sequence. (There is a race
* between the route switching and the forwarding I think.)
*/
#ifdef HAVE_AF_PACKET
if (af_packet) {
memset(&sl, 0, sizeof(sl));
sl.sll_family = AF_PACKET;
sl.sll_protocol = *(unsigned short *)buffer;
sl.sll_ifindex = snoop_index;
to = (struct sockaddr *)&sl;
to_len = sizeof(sl);
} else
#endif
{
memset(&sp, 0, sizeof(sp));
sp.spkt_family = AF_INET;
strcpy(sp.spkt_device, snoop_dev);
sp.spkt_protocol = *(unsigned short *)buffer;
to = (struct sockaddr *)&sp;
to_len = sizeof(sp);
}
dlen = len - sizeof(unsigned short);
if (debug&DEBUG_VERBOSE)
mon_syslog(LOG_DEBUG,"Forwarding packet of length %d", dlen);
if (sendto(fwdfd, buffer+sizeof(unsigned short), dlen, 0, to, to_len) < 0) {
mon_syslog(LOG_ERR,
"Error forwarding data packet to physical device: %m");
}
} else {
/* If the link isn't up, then we better buffer the packets */
if (buffer_packets)
buffer_packet(len,buffer);
}
}
/*
* Terminate diald gracefully.
*/
static int in_die = 0;
void die(int i)
{
int count;
if (!in_die) {
in_die = 1;
mon_syslog(LOG_NOTICE, "Diald is dying with code %d", i);
/* We're killing without a care here. Uhggg. */
if (link_pid) kill(link_pid,SIGINT);
if (dial_pid)
if (kill(-dial_pid, SIGINT) == -1)
kill(dial_pid, SIGINT);
if (running_pid) kill(running_pid,SIGINT);
/* Wait up to 30 seconds for them to die */
for (count = 0; (link_pid || dial_pid) && count < 30; count++)
sleep(1);
/* If they aren't dead yet, kill them for sure */
if (link_pid) kill(link_pid,SIGKILL);
if (dial_pid)
if (kill(-dial_pid, SIGKILL) == -1)
kill(dial_pid, SIGKILL);
if (running_pid) kill(running_pid,SIGKILL);
/* Give the system a second to send the signals */
if (link_pid || dial_pid || running_pid) sleep(1);
close_modem();
interface_down();
proxy_release();
if (deinitializer) {
if (devices && devices[0])
setenv("MODEM", devices[0], 1);
run_shell(SHELL_WAIT, "deinit", deinitializer, -1);
}
if (tcp_fd >= 0)
close(tcp_fd);
unlink(pidfile);
exit(i);
}
}
/*
* Signal handlers.
*/
/*
* Modem link went down.
*/
void sig_hup(int sig)
{
mon_syslog(LOG_NOTICE, "SIGHUP: modem got hung up on.");
modem_hup = 1;
}
/*
* User wants the link to go down.
* (Perhaps there should be a 10 second delay? Configurable????)
*/
void sig_intr(int sig)
{
mon_syslog(LOG_NOTICE, "SIGINT: Link down request received.");
request_down = 1;
request_up = 0;
}
/*
* The user has requested that the link be put up.
*/
void linkup(int sig)
{
mon_syslog(LOG_NOTICE, "SIGUSR1. External link up request received.");
request_down = 0;
request_up = 1;
}
/*
* A child process died. Find out which one.
*/
void sig_chld(int sig)
{
int pid, status;
static int seq = 0;
++seq;
while ((pid = waitpid(-1,&status,WNOHANG)) > 0) {
if (debug&DEBUG_VERBOSE)
mon_syslog( LOG_DEBUG, "SIGCHLD[%d]: pid %d %s, status %d", seq, pid,
pid == link_pid ? "link"
: pid == dial_pid ? "dial"
: pid == running_pid ? "system"
: "other",
status);
if (pid == link_pid) link_pid = 0;
else if (pid == dial_pid) { dial_status = status; dial_pid = 0; }
else if (pid == running_pid) { running_status = status; running_pid = 0; }
else if (!WIFEXITED(status))
mon_syslog(LOG_ERR,"Abnormal exit (status %d) on pid %d",status,pid);
else if (WEXITSTATUS(status) != 0)
mon_syslog(LOG_ERR,"Nonzero exit status (%d) on pid %d",
WEXITSTATUS(status),pid);
if (pid > 0) {
if (WIFSIGNALED(status)) {
mon_syslog(LOG_WARNING, "child process %d terminated with signal %d",
pid, WTERMSIG(status));
}
}
}
if (pid && errno != ECHILD)
mon_syslog(LOG_ERR, "waitpid: %m");
return;
}
/*
* User wants diald to be terminated.
*/
void sig_term(int sig)
{
mon_syslog(LOG_NOTICE, "SIGTERM. Termination request received.");
terminate = 1;
}
/*
* UGH. Pulling stuff out of the monitors list is full of races.
*/
void mon_write(unsigned int level, char *message, int len)
{
int pri = 6<<24;
MONITORS *c = monitors, *p = 0, *cn;
if ((level & MONITOR_MESSAGE)
&& len > 3 && message[0] == '<' && message[2] == '>') {
pri = (message[1] - '0')<<24;
message += 3;
len -= 3;
}
block_signals(); /* don't let anything mess up the data */
while (c) {
cn = c->next;
if ((c->level & level) == level
&& (!(level & MONITOR_MESSAGE) || pri <= (c->level & 0xff000000))) {
if (write(c->fd,message,len) < 0) {
if (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK) {
#if 0
syslog(LOG_INFO,"Writing error on pipe %s: %m.",c->name);
#endif
/* Write error. The reader probably got swapped out
* or something and the pipe flooded. We'll just "loose"
* the data.
*/
p = c;
c = cn;
continue;
}
close(c->fd);
if (p) p->next = c->next;
else monitors = c->next;
mon_syslog(LOG_NOTICE,"Monitor pipe %s closed.",c->name);
free(c->name);
free(c);
} else {
p = c;
}
}
c = cn;
}
unblock_signals(); /* don't let anything mess up the data */
}
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