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/*
* ppp.c - ppp and pppd control.
*
* 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 "diald.h"
#ifdef 0
#ifdef PPP_VERSION_2_2_0
#include <linux/ppp_defs.h>
#include <linux/if_ppp.h>
#else
#include <linux/ppp.h>
#endif
#else
#define PPPIOCGUNIT_2_1_2 0x5494
#define PPPIOCGUNIT_2_2_0 _IOR('t', 86, int)
#endif
/* internal flag to shortcut repeated calls to setaddr */
static int rx_count = -1;
void ppp_start()
{
int pgrpid;
#ifdef DEBIAN_REDIRECT_PPPD_STDERR
int pipes_fd[2];
int fdflags;
#endif /* ndef DEBIAN_REDIRECT_PPPD_STDERR */
block_signals();
link_iface = -1;
rx_count = -1;
#ifdef DEBIAN_REDIRECT_PPPD_STDERR
if (pipe(pipes_fd)!=0) {
unblock_signals();
syslog(LOG_ERR, "pipe() failed: %m");
die(1);
}
pppd_stderr_fd=pipes_fd[0];
if ((fdflags=fcntl(pppd_stderr_fd, F_GETFL))==-1) {
unblock_signals();
syslog(LOG_ERR, "fcntl(pppd_stderr_fd, F_GETFL) failed: %m");
die(1);
}
fdflags |= O_NONBLOCK;
if (fcntl(pppd_stderr_fd, F_SETFL, fdflags)==-1) {
unblock_signals();
syslog(LOG_ERR, "fcntl(pppd_stderr_fd, F_SETFL) failed: %m");
die(1);
}
#endif /* ndef DEBIAN_REDIRECT_PPPD_STDERR */
/* Run pppd directly here and set up to wait for the iface */
link_pid = fork();
if (link_pid < 0) {
unblock_signals();
syslog(LOG_ERR, "failed to fork pppd: %m");
die(1);
}
#define ADD_ARG(arg) { argv[i] = arg; argv_len += strlen(argv[i++]) + 1; }
if (link_pid == 0) {
char **argv = (char **)malloc(sizeof(char *)*(pppd_argc+11));
int argv_len = 0;
char buf[24], *argv_buf;
int i = 0, j;;
default_sigacts();
unblock_signals();
ADD_ARG(path_pppd);
ADD_ARG("-detach");
if (modem) ADD_ARG("modem");
if (crtscts) ADD_ARG("crtscts");
ADD_ARG("mtu");
sprintf(buf,"%d",mtu);
ADD_ARG(strdup(buf));
ADD_ARG("mru");
sprintf(buf,"%d",mru);
ADD_ARG(strdup(buf));
if (netmask) {
ADD_ARG("netmask");
ADD_ARG(netmask);
}
for (j = 0; j < pppd_argc; j++) {
ADD_ARG(pppd_argv[j]);
}
argv[i++] = 0;
if ((argv_buf = (char *)malloc(argv_len + 1))) {
argv_len = i - 1;
*argv_buf = '\0';
for (i = 0; i < argv_len; i++) {
strcat(argv_buf, argv[i]);
strcat(argv_buf, " ");
}
syslog(LOG_DEBUG, "Running pppd: %s", argv_buf);
}
/* make sure pppd is the session leader and has the controlling
* terminal so it gets the SIGHUP's
*/
pgrpid = setsid();
ioctl(modem_fd, TIOCSCTTY, 1);
tcsetpgrp(modem_fd, pgrpid);
setreuid(getuid(), getuid());
setregid(getgid(), getgid());
dup2(modem_fd, 0);
dup2(modem_fd, 1);
#ifdef DEBIAN_REDIRECT_PPPD_STDERR
dup2(pipes_fd[1], 2);
close(pipes_fd[0]);
close(pipes_fd[1]);
#endif /* ndef DEBIAN_REDIRECT_PPPD_STDERR */
execv(path_pppd,argv);
syslog(LOG_ERR, "could not exec %s: %m",path_pppd);
_exit(99);
/* NOTREACHED */
}
#ifdef DEBIAN_REDIRECT_PPPD_STDERR
close(pipes_fd[1]);
#endif /* ndef DEBIAN_REDIRECT_PPPD_STDERR */
unblock_signals();
syslog(LOG_INFO,"Running pppd (pid = %d).",link_pid);
}
/*
* SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
* if it exists.
*/
#define SET_SA_FAMILY(addr, family) \
memset ((char *) &(addr), '\0', sizeof(addr)); \
addr.sa_family = (family);
/*
* Find the interface number of the ppp device that pppd opened up and
* do any routing we might need to do.
* If pppd has not yet opened the device, then return 0, else return 1.
*/
int ppp_set_addrs()
{
ulong laddr = 0, raddr = 0;
/* Try to get the interface number if we don't know it yet. */
if (link_iface == -1) {
/* Try the pppd-2.2.0 ioctrl first,
* Try the pppd-2.1.2 ioctrl if that fails
*/
if (ioctl(modem_fd, PPPIOCGUNIT_2_2_0, &link_iface) == -1)
ioctl(modem_fd, PPPIOCGUNIT_2_1_2, &link_iface);
}
/* Ok then, see if pppd has upped the interface yet. */
if (link_iface != -1) {
struct ifreq ifr;
SET_SA_FAMILY (ifr.ifr_addr, AF_INET);
SET_SA_FAMILY (ifr.ifr_dstaddr, AF_INET);
SET_SA_FAMILY (ifr.ifr_netmask, AF_INET);
sprintf(ifr.ifr_name,"ppp%d",link_iface);
if (ioctl(snoopfd, SIOCGIFFLAGS, (caddr_t) &ifr) == -1) {
syslog(LOG_ERR,"failed to read ppp interface status");
return 0;
}
if (!(ifr.ifr_flags & IFF_UP))
return 0; /* interface is not up yet */
if (route_wait) {
/* set the initial rx counter once the link is up */
if (rx_count == -1) rx_count = ppp_rx_count();
/* check if we got the routing packet yet */
if (ppp_rx_count() == rx_count) return 0;
}
/* Ok, the interface is up, grab the addresses. */
if (ioctl(snoopfd, SIOCGIFADDR, (caddr_t) &ifr) == -1)
syslog(LOG_ERR,"failed to get ppp local address: %m");
else
laddr = ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr;
if (ioctl(snoopfd, SIOCGIFDSTADDR, (caddr_t) &ifr) == -1)
syslog(LOG_ERR,"failed to get ppp remote address: %m");
else
raddr = ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr;
/* Check the MTU, see if it matches what we asked for. If it
* doesn't warn the user and adjust the MTU setting.
* (NOTE: Adjusting the MTU setting may cause kernel nastyness...)
*/
if (ioctl(snoopfd, SIOCGIFMTU, (caddr_t) &ifr) == -1) {
syslog(LOG_ERR,"failed to get ppp mtu setting: %m");
} else {
if (ifr.ifr_mtu != mtu) {
syslog(LOG_ERR,"PPP negotiated mtu of %d does not match requested setting %d.",ifr.ifr_mtu,mtu);
syslog(LOG_ERR,"Attempting to auto adjust mtu.");
syslog(LOG_ERR,"Restart diald with mtu set to %d to avoid errors.",ifr.ifr_mtu);
mtu = ifr.ifr_mtu;
proxy_config(orig_local_ip,orig_remote_ip);
}
}
if (dynamic_addrs) {
/* only do the configuration in dynamic mode. */
struct in_addr addr;
addr.s_addr = raddr;
remote_ip = strdup(inet_ntoa(addr));
addr.s_addr = laddr;
local_ip = strdup(inet_ntoa(addr));
local_addr = laddr;
syslog(LOG_INFO,"New addresses: local %s, remote %s.",
local_ip,remote_ip);
/* have to reset the proxy if we won't be rerouting... */
if (!do_reroute) {
/* If we are rerouting, then we have a window without
* routes here. The proxy_config calls ifconfig, which
* clobbers all the routes.
*/
proxy_config(local_ip,remote_ip);
set_ptp("sl",proxy_iface,remote_ip,1);
add_routes("sl",proxy_iface,local_ip,remote_ip,1);
}
}
/* This is redundant in normal operation, but if we
* have to restart the link, then this is necessary...
*/
set_ptp("ppp",link_iface,remote_ip,0);
if (do_reroute)
add_routes("ppp",link_iface,local_ip,remote_ip,0);
return 1;
}
return 0;
}
int ppp_dead()
{
/* pppd is way too enthusiastic about deleting routes it had
* nothing to do with creating. Therefore, we have to reestablish
* the proxy routes here, including the point to point route!
*/
if (link_pid == 0)
ppp_reroute();
return (link_pid == 0);
}
int ppp_route_exists()
{
char buf[128];
int device = 0;
int found = 0;
FILE *fp;
sprintf(buf,"%s -n",path_route);
if ((fp = popen(buf,"r"))==NULL) {
syslog(LOG_ERR,"Could not run command '%s': %m",buf);
return 0; /* assume half dead in this case... */
}
while (fgets(buf,128,fp)) {
if (sscanf(buf,"%*s %*s %*s %*s %*s %*s %*s ppp%d",&device) == 1) {
if (device == link_iface) found = 1;
}
}
fclose(fp);
return found;
}
int ppp_rx_count()
{
char buf[128];
int packets = 0;
FILE *fp;
sprintf(buf,"%s ppp%d",path_ifconfig,link_iface);
if ((fp = popen(buf,"r"))==NULL) {
syslog(LOG_ERR,"Could not run command '%s': %m",buf);
return 0; /* assume half dead in this case... */
}
while (fgets(buf,128,fp)) {
if (sscanf(buf," RX packets:%d",&packets) == 1) {
break;
}
}
fclose(fp);
return packets;
}
void ppp_stop()
{
if (link_pid)
if (kill(link_pid,SIGINT) == -1 && errno == ESRCH)
link_pid = 0;
}
void ppp_reroute()
{
/* Restore the original proxy routing */
/* If there was a change in the proxy addresses
* (i.e., we are running with -reroute), then
* this will change introduce a window in which
* we loose our routes. There does not seem to be a way
* to avoid this. Sigh.
*/
proxy_config(orig_local_ip,orig_remote_ip);
set_ptp("sl",proxy_iface,orig_remote_ip,1);
add_routes("sl",proxy_iface,orig_local_ip,orig_remote_ip,1);
local_addr = inet_addr(orig_local_ip);
/* If we did routing on the ppp link, remove it */
if (do_reroute && link_iface != -1)
del_routes("ppp",link_iface,local_ip,remote_ip,0);
link_iface = -1;
}
void ppp_kill()
{
if (link_pid)
if (kill(link_pid,SIGKILL) == -1 && errno == ESRCH)
link_pid = 0;
}
void ppp_zombie()
{
/* Either ppp became a zombie or we missed a SIGCHLD signal */
sig_chld(SIGKILL); /* try to reap the child */
link_pid = 0; /* just in case the reaping failed, forget zombie */
}
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