[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/app/ppp-2.4.1/pppoecd/sys-linux.c b/ap/app/ppp-2.4.1/pppoecd/sys-linux.c
new file mode 100644
index 0000000..b18db0f
--- /dev/null
+++ b/ap/app/ppp-2.4.1/pppoecd/sys-linux.c
@@ -0,0 +1,1343 @@
+/*
+ * sys-linux.c - System-dependent procedures for setting up
+ * PPP interfaces on Linux systems
+ *
+ * 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 <sys/ioctl.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <sys/errno.h>
+#include <sys/file.h>
+#include <sys/stat.h>
+#include <sys/utsname.h>
+#include <sys/sysmacros.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <syslog.h>
+#include <string.h>
+#include <time.h>
+#include <memory.h>
+#include <utmp.h>
+#include <mntent.h>
+#include <signal.h>
+#include <fcntl.h>
+#include <ctype.h>
+#include <termios.h>
+#include <unistd.h>
+
+/* This is in netdevice.h. However, this compile will fail miserably if
+ you attempt to include netdevice.h because it has so many references
+ to __memcpy functions which it should not attempt to do. So, since I
+ really don't use it, but it must be defined, define it now. */
+
+#ifndef MAX_ADDR_LEN
+#define MAX_ADDR_LEN 7
+#endif
+
+#if __GLIBC__ >= 2
+#include <asm/types.h> /* glibc 2 conflicts with linux/types.h */
+#include <net/if.h>
+#include <net/if_arp.h>
+#include <net/route.h>
+#include <netinet/if_ether.h>
+#else
+#include <linux/types.h>
+#include <linux/if.h>
+#include <linux/if_arp.h>
+#include <linux/route.h>
+#include <linux/if_ether.h>
+#endif
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include <linux/ppp_defs.h>
+#include <linux/if_ppp.h>
+
+#include "pppd.h"
+#include "fsm.h"
+#include "ipcp.h"
+
+/* We can get an EIO error on an ioctl if the modem has hung up */
+#define ok_error(num) ((num)==EIO)
+
+static int tty_disc = N_TTY; /* The TTY discipline */
+static int ppp_disc = N_PPP; /* The PPP discpline */
+static int initfdflags = -1; /* Initial file descriptor flags for fd */
+static int ppp_fd = -1; /* fd which is set to PPP discipline */
+static int sock_fd = -1; /* socket for doing interface ioctls */
+static int slave_fd = -1;
+static int master_fd = -1;
+static int ppp_dev_fd = -1; /* fd for /dev/ppp (new style driver) */
+static int chindex; /* channel index (new style driver) */
+
+static fd_set in_fds; /* set of fds that wait_input waits for */
+static int max_in_fd; /* highest fd set in in_fds */
+
+static int driver_version = 0;
+static int driver_modification = 0;
+static int driver_patch = 0;
+
+static char loop_name[20];
+static unsigned char inbuf[512]; /* buffer for chars read from loopback */
+
+static int if_is_up; /* Interface has been marked up */
+static u_int32_t our_old_addr; /* for detecting address changes */
+static int dynaddr_set; /* 1 if ip_dynaddr set */
+static int looped; /* 1 if using loop */
+
+static int kernel_version;
+#define KVERSION(j,n,p) ((j)*1000000 + (n)*1000 + (p))
+
+#define MAX_IFS 100
+
+#define FLAGS_GOOD (IFF_UP | IFF_BROADCAST)
+#define FLAGS_MASK (IFF_UP | IFF_BROADCAST | \
+ IFF_POINTOPOINT | IFF_LOOPBACK | IFF_NOARP)
+
+#define SIN_ADDR(x) (((struct sockaddr_in *) (&(x)))->sin_addr.s_addr)
+
+/* Prototypes for procedures local to this file. */
+static int get_flags (int fd);
+static void set_flags (int fd, int flags);
+static int make_ppp_unit(void);
+static void restore_loop(void); /* Transfer ppp unit back to loopback */
+
+extern u_char inpacket_buf[]; /* borrowed from main.c */
+
+/*
+ * 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);
+
+/*
+ * Determine if the PPP connection should still be present.
+ */
+
+extern int hungup;
+
+/* new_fd is the fd of a tty */
+static void set_ppp_fd (int new_fd)
+{
+ SYSDEBUG ((LOG_DEBUG, "setting ppp_fd to %d\n", new_fd));
+ ppp_fd = new_fd;
+ if (!new_style_driver)
+ ppp_dev_fd = new_fd;
+}
+
+static int still_ppp(void)
+{
+ if (new_style_driver)
+ return !hungup && ppp_fd >= 0;
+ if (!hungup || ppp_fd == slave_fd)
+ return 1;
+ if (slave_fd >= 0) {
+ set_ppp_fd(slave_fd);
+ return 1;
+ }
+ return 0;
+}
+
+/********************************************************************
+ *
+ * Functions to read and set the flags value in the device driver
+ */
+
+static int get_flags (int fd)
+{
+ int flags;
+
+ if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &flags) < 0) {
+ if ( ok_error (errno) )
+ flags = 0;
+ else
+ fatal("ioctl(PPPIOCGFLAGS): %m");
+ }
+
+ SYSDEBUG ((LOG_DEBUG, "get flags = %x\n", flags));
+ return flags;
+}
+
+/********************************************************************/
+
+static void set_flags (int fd, int flags)
+{
+ SYSDEBUG ((LOG_DEBUG, "set flags = %x\n", flags));
+
+ if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &flags) < 0) {
+ if (! ok_error (errno) )
+ fatal("ioctl(PPPIOCSFLAGS, %x): %m", flags, errno);
+ }
+}
+
+/********************************************************************
+ *
+ * sys_init - System-dependent initialization.
+ */
+
+void sys_init(void)
+{
+ int flags;
+
+ if (new_style_driver) {
+ ppp_dev_fd = open("/dev/ppp", O_RDWR);
+ if (ppp_dev_fd < 0)
+ fatal("Couldn't open /dev/ppp: %m");
+ flags = fcntl(ppp_dev_fd, F_GETFL);
+ if (flags == -1
+ || fcntl(ppp_dev_fd, F_SETFL, flags | O_NONBLOCK) == -1)
+ warn("Couldn't set /dev/ppp to nonblock: %m");
+ }
+
+ /* Get an internet socket for doing socket ioctls. */
+ sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
+ if (sock_fd < 0)
+ fatal("Couldn't create IP socket: %m(%d)", errno);
+
+ FD_ZERO(&in_fds);
+ max_in_fd = 0;
+}
+
+/********************************************************************
+ *
+ * sys_cleanup - restore any system state we modified before exiting:
+ * mark the interface down, delete default route and/or proxy arp entry.
+ * This shouldn't call die() because it's called from die().
+ */
+
+void sys_cleanup(void)
+{
+/*
+ * Take down the device
+ */
+ if (if_is_up) {
+ if_is_up = 0;
+ sifdown(0);
+ }
+}
+
+/********************************************************************
+ *
+ * sys_close - Clean up in a child process before execing.
+ */
+void
+sys_close(void)
+{
+ close(ppp_dev_fd);
+ if (sock_fd >= 0)
+ close(sock_fd);
+ if (slave_fd >= 0)
+ close(slave_fd);
+ if (master_fd >= 0)
+ close(master_fd);
+ closelog();
+}
+
+/********************************************************************
+ *
+ * set_kdebugflag - Define the debugging level for the kernel
+ */
+
+static int set_kdebugflag (int requested_level)
+{
+ if (new_style_driver && ifunit < 0)
+ return 1;
+ if (ioctl(ppp_dev_fd, PPPIOCSDEBUG, &requested_level) < 0) {
+ if ( ! ok_error (errno) )
+ error("ioctl(PPPIOCSDEBUG): %m");
+ return (0);
+ }
+ SYSDEBUG ((LOG_INFO, "set kernel debugging level to %d",
+ requested_level));
+ return (1);
+}
+
+
+/********************************************************************
+ *
+ * generic_establish_ppp - Turn the fd into a ppp interface.
+ */
+int generic_establish_ppp (int fd)
+{
+ int x;
+/*
+ * Demand mode - prime the old ppp device to relinquish the unit.
+ */
+ if (!new_style_driver && looped
+ && ioctl(slave_fd, PPPIOCXFERUNIT, 0) < 0) {
+ error("ioctl(transfer ppp unit): %m");
+ return -1;
+ }
+
+
+ if (new_style_driver) {
+ /* Open another instance of /dev/ppp and connect the channel to it */
+ int flags;
+
+ if (ioctl(fd, PPPIOCGCHAN, &chindex) == -1) {
+ error("Couldn't get channel number: %m");
+ goto err;
+ }
+ dbglog("using channel %d", chindex);
+ fd = open("/dev/ppp", O_RDWR);
+ if (fd < 0) {
+ error("Couldn't reopen /dev/ppp: %m");
+ goto err;
+ }
+ if (ioctl(fd, PPPIOCATTCHAN, &chindex) < 0) {
+ error("Couldn't attach to channel %d: %m", chindex);
+ goto err_close;
+ }
+ flags = fcntl(fd, F_GETFL);
+ if (flags == -1 || fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
+ warn("Couldn't set /dev/ppp (channel) to nonblock: %m");
+ set_ppp_fd(fd);
+
+ if (!looped)
+ ifunit = -1;
+ if (!looped && !multilink) {
+ /*
+ * Create a new PPP unit.
+ */
+ if (make_ppp_unit() < 0)
+ goto err_close;
+ }
+
+ if (looped)
+ set_flags(ppp_dev_fd, get_flags(ppp_dev_fd) & ~SC_LOOP_TRAFFIC);
+
+ if (!multilink) {
+ add_fd(ppp_dev_fd);
+ if (ioctl(fd, PPPIOCCONNECT, &ifunit) < 0) {
+ error("Couldn't attach to PPP unit %d: %m", ifunit);
+ goto err_close;
+ }
+ }
+
+ } else {
+
+ /*
+ * Old-style driver: find out which interface we were given.
+ */
+ set_ppp_fd (fd);
+ if (ioctl(fd, PPPIOCGUNIT, &x) < 0) {
+ if (ok_error (errno))
+ goto err;
+ fatal("ioctl(PPPIOCGUNIT): %m(%d)", errno);
+ }
+ /* Check that we got the same unit again. */
+ if (looped && x != ifunit)
+ fatal("transfer_ppp failed: wanted unit %d, got %d", ifunit, x);
+ ifunit = x;
+
+ /*
+ * Fetch the initial file flags and reset blocking mode on the file.
+ */
+ initfdflags = fcntl(fd, F_GETFL);
+ if (initfdflags == -1 ||
+ fcntl(fd, F_SETFL, initfdflags | O_NONBLOCK) == -1) {
+ if ( ! ok_error (errno))
+ warn("Couldn't set device to non-blocking mode: %m");
+ }
+ }
+
+
+ /*
+ * Enable debug in the driver if requested.
+ */
+ if (!looped)
+ set_kdebugflag (kdebugflag);
+
+ SYSDEBUG ((LOG_NOTICE, "Using version %d.%d.%d of PPP driver",
+ driver_version, driver_modification, driver_patch));
+
+ return ppp_fd;
+
+ err_close:
+ close(fd);
+ err:
+ if (ioctl(fd, TIOCSETD, &tty_disc) < 0 && !ok_error(errno))
+ warn("Couldn't reset tty to normal line discipline: %m");
+ return -1;
+}
+
+/********************************************************************
+ *
+ * generic_disestablish_ppp - Restore device components to normal
+ * operation, and reconnect the ppp unit to the loopback if in demand
+ * mode. This shouldn't call die() because it's called from die().
+*/
+void generic_disestablish_ppp(int dev_fd){
+ /* Restore loop if needed */
+ if(demand)
+ restore_loop();
+
+ /* Finally detach the device */
+ initfdflags = -1;
+
+ if (new_style_driver) {
+ close(ppp_fd);
+ ppp_fd = -1;
+ if (!looped && ifunit >= 0 && ioctl(ppp_dev_fd, PPPIOCDETACH) < 0)
+ error("Couldn't release PPP unit: %m");
+ if (!multilink)
+ remove_fd(ppp_dev_fd);
+ }
+}
+
+/*
+ * make_ppp_unit - make a new ppp unit for ppp_dev_fd.
+ * Assumes new_style_driver.
+ */
+static int make_ppp_unit()
+{
+ int x;
+
+ ifunit = req_unit;
+ x = ioctl(ppp_dev_fd, PPPIOCNEWUNIT, &ifunit);
+ if (x < 0 && req_unit >= 0 && errno == EEXIST) {
+ warn("Couldn't allocate PPP unit %d as it is already in use");
+ ifunit = -1;
+ x = ioctl(ppp_dev_fd, PPPIOCNEWUNIT, &ifunit);
+ }
+ if (x < 0)
+ error("Couldn't create new ppp unit: %m");
+ return x;
+}
+
+/********************************************************************
+ *
+ * clean_check - Fetch the flags for the device and generate
+ * appropriate error messages.
+ */
+void clean_check(void)
+{
+ int x;
+ char *s;
+
+ if (still_ppp()) {
+ if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) == 0) {
+ s = NULL;
+ switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP)) {
+ case SC_RCV_B7_0:
+ s = "all had bit 7 set to 1";
+ break;
+
+ case SC_RCV_B7_1:
+ s = "all had bit 7 set to 0";
+ break;
+
+ case SC_RCV_EVNP:
+ s = "all had odd parity";
+ break;
+
+ case SC_RCV_ODDP:
+ s = "all had even parity";
+ break;
+ }
+
+ if (s != NULL) {
+ warn("Receive serial link is not 8-bit clean:");
+ warn("Problem: %s", s);
+ }
+ }
+ }
+}
+
+/********************************************************************
+ *
+ * output - Output PPP packet.
+ */
+
+void output (int unit, unsigned char *p, int len)
+{
+ int fd = ppp_fd;
+ int proto;
+
+ if (debug)
+ dbglog("sent %P", p, len);
+
+ if (len < PPP_HDRLEN)
+ return;
+ if (new_style_driver) {
+ p += 2;
+ len -= 2;
+ proto = (p[0] << 8) + p[1];
+ if (ifunit >= 0 && !(proto >= 0xc000 || proto == PPP_CCPFRAG))
+ fd = ppp_dev_fd;
+ }
+ if (write(fd, p, len) < 0) {
+ if (errno == EWOULDBLOCK || errno == ENOBUFS
+ || errno == ENXIO || errno == EIO || errno == EINTR)
+ warn("write: warning: %m (%d)", errno);
+ else
+ error("write: %m (%d)", errno);
+ }
+}
+
+/********************************************************************
+ *
+ * wait_input - wait until there is data available,
+ * for the length of time specified by *timo (indefinite
+ * if timo is NULL).
+ */
+
+void wait_input(struct timeval *timo)
+{
+ fd_set ready, exc;
+ int n;
+
+ ready = in_fds;
+ exc = in_fds;
+ n = select(max_in_fd + 1, &ready, NULL, &exc, timo);
+ if (n < 0 && errno != EINTR)
+ fatal("select: %m(%d)", errno);
+}
+
+/*
+ * add_fd - add an fd to the set that wait_input waits for.
+ */
+void add_fd(int fd)
+{
+ FD_SET(fd, &in_fds);
+ if (fd > max_in_fd)
+ max_in_fd = fd;
+}
+
+/*
+ * remove_fd - remove an fd from the set that wait_input waits for.
+ */
+void remove_fd(int fd)
+{
+ FD_CLR(fd, &in_fds);
+}
+
+
+/********************************************************************
+ *
+ * read_packet - get a PPP packet from the serial device.
+ */
+
+int read_packet (unsigned char *buf)
+{
+ int len, nr;
+
+ len = PPP_MRU + PPP_HDRLEN;
+ if (new_style_driver) {
+ *buf++ = PPP_ALLSTATIONS;
+ *buf++ = PPP_UI;
+ len -= 2;
+ }
+ nr = -1;
+ if (ppp_fd >= 0) {
+ nr = read(ppp_fd, buf, len);
+ if (nr < 0 && errno != EWOULDBLOCK && errno != EIO && errno != EINTR)
+ error("read: %m");
+ if (nr < 0 && errno == ENXIO)
+ return 0;
+ }
+ if (nr < 0 && new_style_driver && ifunit >= 0) {
+ /* N.B. we read ppp_fd first since LCP packets come in there. */
+ nr = read(ppp_dev_fd, buf, len);
+ if (nr < 0 && errno != EWOULDBLOCK && errno != EIO && errno != EINTR)
+ error("read /dev/ppp: %m");
+ if (nr < 0 && errno == ENXIO)
+ return 0;
+ }
+ return (new_style_driver && nr > 0)? nr+2: nr;
+}
+
+/********************************************************************
+ *
+ * get_loop_output - get outgoing packets from the ppp device,
+ * and detect when we want to bring the real link up.
+ * Return value is 1 if we need to bring up the link, 0 otherwise.
+ */
+int
+get_loop_output(void)
+{
+ int rv = 0;
+ int n;
+
+ if (new_style_driver) {
+ while ((n = read_packet(inpacket_buf)) > 0)
+ if (loop_frame(inpacket_buf, n))
+ rv = 1;
+ return rv;
+ }
+
+ while ((n = read(master_fd, inbuf, sizeof(inbuf))) > 0)
+ if (loop_chars(inbuf, n))
+ rv = 1;
+
+ if (n == 0)
+ fatal("eof on loopback");
+
+ if (errno != EWOULDBLOCK)
+ fatal("read from loopback: %m(%d)", errno);
+
+ return rv;
+}
+
+/*
+ * netif_set_mtu - set the MTU on the PPP network interface.
+ */
+void
+netif_set_mtu(int unit, int mtu)
+{
+ struct ifreq ifr;
+
+ SYSDEBUG ((LOG_DEBUG, "netif_set_mtu: mtu = %d\n", mtu));
+
+ memset (&ifr, '\0', sizeof (ifr));
+ strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
+ ifr.ifr_mtu = mtu;
+
+ if (ifunit >= 0 && ioctl(sock_fd, SIOCSIFMTU, (caddr_t) &ifr) < 0)
+ fatal("ioctl(SIOCSIFMTU): %m");
+}
+
+/********************************************************************
+ *
+ * ccp_test - ask kernel whether a given compression method
+ * is acceptable for use.
+ */
+
+int ccp_test (int unit, u_char *opt_ptr, int opt_len, int for_transmit)
+{
+ struct ppp_option_data data;
+
+ memset (&data, '\0', sizeof (data));
+ data.ptr = opt_ptr;
+ data.length = opt_len;
+ data.transmit = for_transmit;
+
+ if (ioctl(ppp_dev_fd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0)
+ return 1;
+
+ return (errno == ENOBUFS)? 0: -1;
+}
+
+/********************************************************************
+ *
+ * ccp_flags_set - inform kernel about the current state of CCP.
+ */
+
+void ccp_flags_set (int unit, int isopen, int isup)
+{
+ if (still_ppp()) {
+ int x = get_flags(ppp_dev_fd);
+ x = isopen? x | SC_CCP_OPEN : x &~ SC_CCP_OPEN;
+ x = isup? x | SC_CCP_UP : x &~ SC_CCP_UP;
+ set_flags (ppp_dev_fd, x);
+ }
+}
+
+/********************************************************************
+ *
+ * get_idle_time - return how long the link has been idle.
+ */
+int
+get_idle_time(u, ip)
+ int u;
+ struct ppp_idle *ip;
+{
+ return ioctl(ppp_dev_fd, PPPIOCGIDLE, ip) >= 0;
+}
+
+/********************************************************************
+ *
+ * get_ppp_stats - return statistics for the link.
+ */
+int
+get_ppp_stats(u, stats)
+ int u;
+ struct pppd_stats *stats;
+{
+ struct ifpppstatsreq req;
+
+ memset (&req, 0, sizeof (req));
+
+ req.stats_ptr = (caddr_t) &req.stats;
+ strlcpy(req.ifr__name, ifname, sizeof(req.ifr__name));
+ if (ioctl(sock_fd, SIOCGPPPSTATS, &req) < 0) {
+ error("Couldn't get PPP statistics: %m");
+ return 0;
+ }
+ stats->bytes_in = req.stats.p.ppp_ibytes;
+ stats->bytes_out = req.stats.p.ppp_obytes;
+ return 1;
+}
+
+/********************************************************************
+ *
+ * ccp_fatal_error - returns 1 if decompression was disabled as a
+ * result of an error detected after decompression of a packet,
+ * 0 otherwise. This is necessary because of patent nonsense.
+ */
+
+int ccp_fatal_error (int unit)
+{
+ int x = get_flags(ppp_dev_fd);
+
+ return x & SC_DC_FERROR;
+}
+
+/********************************************************************
+ *
+ * Return user specified netmask, modified by any mask we might determine
+ * for address `addr' (in network byte order).
+ * Here we scan through the system's list of interfaces, looking for
+ * any non-point-to-point interfaces which might appear to be on the same
+ * network as `addr'. If we find any, we OR in their netmask to the
+ * user-specified netmask.
+ */
+
+u_int32_t GetMask (u_int32_t addr)
+{
+ u_int32_t mask, nmask, ina;
+ struct ifreq *ifr, *ifend, ifreq;
+ struct ifconf ifc;
+ struct ifreq ifs[MAX_IFS];
+
+ addr = ntohl(addr);
+
+ if (IN_CLASSA(addr)) /* determine network mask for address class */
+ nmask = IN_CLASSA_NET;
+ else if (IN_CLASSB(addr))
+ nmask = IN_CLASSB_NET;
+ else
+ nmask = IN_CLASSC_NET;
+
+ /* class D nets are disallowed by bad_ip_adrs */
+ mask = netmask | htonl(nmask);
+/*
+ * Scan through the system's network interfaces.
+ */
+ ifc.ifc_len = sizeof(ifs);
+ ifc.ifc_req = ifs;
+ if (ioctl(sock_fd, SIOCGIFCONF, &ifc) < 0) {
+ if ( ! ok_error ( errno ))
+ warn("ioctl(SIOCGIFCONF): %m(%d)", errno);
+ return mask;
+ }
+
+ ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
+ for (ifr = ifc.ifc_req; ifr < ifend; ifr++) {
+/*
+ * Check the interface's internet address.
+ */
+ if (ifr->ifr_addr.sa_family != AF_INET)
+ continue;
+ ina = SIN_ADDR(ifr->ifr_addr);
+ if (((ntohl(ina) ^ addr) & nmask) != 0)
+ continue;
+/*
+ * Check that the interface is up, and not point-to-point nor loopback.
+ */
+ strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
+ if (ioctl(sock_fd, SIOCGIFFLAGS, &ifreq) < 0)
+ continue;
+
+ if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0)
+ continue;
+/*
+ * Get its netmask and OR it into our mask.
+ */
+ if (ioctl(sock_fd, SIOCGIFNETMASK, &ifreq) < 0)
+ continue;
+ mask |= SIN_ADDR(ifreq.ifr_addr);
+ break;
+ }
+ return mask;
+}
+
+/********************************************************************
+ *
+ * ppp_available - check whether the system has any ppp interfaces
+ * (in fact we check whether we can do an ioctl on ppp0).
+ */
+
+int ppp_available(void)
+{
+ struct utsname utsname; /* for the kernel version */
+ int osmaj, osmin, ospatch;
+
+ /* get the kernel version now, since we are called before sys_init */
+ uname(&utsname);
+ osmaj = osmin = ospatch = 0;
+ sscanf(utsname.release, "%d.%d.%d", &osmaj, &osmin, &ospatch);
+ kernel_version = KVERSION(osmaj, osmin, ospatch);
+
+ driver_version = 2;
+ driver_modification = 4;
+ driver_patch = 0;
+
+ return 1;
+}
+
+/********************************************************************
+ *
+ * sifvjcomp - config tcp header compression
+ */
+
+int sifvjcomp (int u, int vjcomp, int cidcomp, int maxcid)
+{
+ u_int x = get_flags(ppp_dev_fd);
+
+ if (vjcomp) {
+ if (ioctl (ppp_dev_fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) {
+ if (! ok_error (errno))
+ error("ioctl(PPPIOCSMAXCID): %m(%d)", errno);
+ vjcomp = 0;
+ }
+ }
+
+ x = vjcomp ? x | SC_COMP_TCP : x &~ SC_COMP_TCP;
+ x = cidcomp ? x & ~SC_NO_TCP_CCID : x | SC_NO_TCP_CCID;
+ set_flags (ppp_dev_fd, x);
+
+ return 1;
+}
+
+/********************************************************************
+ *
+ * sifup - Config the interface up and enable IP packets to pass.
+ */
+
+int sifup(int u)
+{
+ struct ifreq ifr;
+
+ memset (&ifr, '\0', sizeof (ifr));
+ strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
+ if (ioctl(sock_fd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
+ if (! ok_error (errno))
+ error("ioctl (SIOCGIFFLAGS): %m(%d)", errno);
+ return 0;
+ }
+
+ ifr.ifr_flags |= (IFF_UP | IFF_POINTOPOINT);
+ if (ioctl(sock_fd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
+ if (! ok_error (errno))
+ error("ioctl(SIOCSIFFLAGS): %m(%d)", errno);
+ return 0;
+ }
+ if_is_up++;
+
+ return 1;
+}
+
+/********************************************************************
+ *
+ * sifdown - Disable the indicated protocol and config the interface
+ * down if there are no remaining protocols.
+ */
+
+int sifdown (int u)
+{
+ struct ifreq ifr;
+
+ if (if_is_up && --if_is_up > 0)
+ return 1;
+
+ memset (&ifr, '\0', sizeof (ifr));
+ strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
+ if (ioctl(sock_fd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
+ if (! ok_error (errno))
+ error("ioctl (SIOCGIFFLAGS): %m(%d)", errno);
+ return 0;
+ }
+
+ ifr.ifr_flags &= ~IFF_UP;
+ ifr.ifr_flags |= IFF_POINTOPOINT;
+ if (ioctl(sock_fd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
+ if (! ok_error (errno))
+ error("ioctl(SIOCSIFFLAGS): %m(%d)", errno);
+ return 0;
+ }
+ return 1;
+}
+
+/********************************************************************
+ *
+ * sifaddr - Config the interface IP addresses and netmask.
+ */
+
+int sifaddr (int unit, u_int32_t our_adr, u_int32_t his_adr,
+ u_int32_t net_mask)
+{
+ struct ifreq ifr;
+ struct rtentry rt;
+
+ memset (&ifr, '\0', sizeof (ifr));
+ memset (&rt, '\0', sizeof (rt));
+
+ SET_SA_FAMILY (ifr.ifr_addr, AF_INET);
+ SET_SA_FAMILY (ifr.ifr_dstaddr, AF_INET);
+ SET_SA_FAMILY (ifr.ifr_netmask, AF_INET);
+
+ strlcpy (ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
+/*
+ * Set our IP address
+ */
+ SIN_ADDR(ifr.ifr_addr) = our_adr;
+ if (ioctl(sock_fd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
+ if (errno != EEXIST) {
+ if (! ok_error (errno))
+ error("ioctl(SIOCSIFADDR): %m(%d)", errno);
+ }
+ else {
+ warn("ioctl(SIOCSIFADDR): Address already exists");
+ }
+ return (0);
+ }
+/*
+ * Set the gateway address
+ */
+ SIN_ADDR(ifr.ifr_dstaddr) = his_adr;
+ if (ioctl(sock_fd, SIOCSIFDSTADDR, (caddr_t) &ifr) < 0) {
+ if (! ok_error (errno))
+ error("ioctl(SIOCSIFDSTADDR): %m(%d)", errno);
+ return (0);
+ }
+/*
+ * Set the netmask.
+ * For recent kernels, force the netmask to 255.255.255.255.
+ */
+ if (kernel_version >= KVERSION(2,1,16))
+ net_mask = ~0L;
+ if (net_mask != 0) {
+ SIN_ADDR(ifr.ifr_netmask) = net_mask;
+ if (ioctl(sock_fd, SIOCSIFNETMASK, (caddr_t) &ifr) < 0) {
+ if (! ok_error (errno))
+ error("ioctl(SIOCSIFNETMASK): %m(%d)", errno);
+ return (0);
+ }
+ }
+/*
+ * Add the device route
+ */
+ if (kernel_version < KVERSION(2,1,16)) {
+ SET_SA_FAMILY (rt.rt_dst, AF_INET);
+ SET_SA_FAMILY (rt.rt_gateway, AF_INET);
+ rt.rt_dev = ifname;
+
+ SIN_ADDR(rt.rt_gateway) = 0L;
+ SIN_ADDR(rt.rt_dst) = his_adr;
+ rt.rt_flags = RTF_UP | RTF_HOST;
+
+ if (kernel_version > KVERSION(2,1,0)) {
+ SET_SA_FAMILY (rt.rt_genmask, AF_INET);
+ SIN_ADDR(rt.rt_genmask) = -1L;
+ }
+
+ if (ioctl(sock_fd, SIOCADDRT, &rt) < 0) {
+ if (! ok_error (errno))
+ error("ioctl(SIOCADDRT) device route: %m(%d)", errno);
+ return (0);
+ }
+ }
+
+ /* set ip_dynaddr in demand mode if address changes */
+ if (demand && tune_kernel && !dynaddr_set
+ && our_old_addr && our_old_addr != our_adr) {
+ /* set ip_dynaddr if possible */
+ char *path;
+ int fd;
+
+ path = "/proc/sys/net/ipv4/ip_dynaddr";
+ if (path != 0 && (fd = open(path, O_WRONLY)) >= 0) {
+ if (write(fd, "1", 1) != 1)
+ error("Couldn't enable dynamic IP addressing: %m");
+ close(fd);
+ }
+ dynaddr_set = 1; /* only 1 attempt */
+ }
+ our_old_addr = 0;
+
+ return 1;
+}
+
+/********************************************************************
+ *
+ * cifaddr - Clear the interface IP addresses, and delete routes
+ * through the interface if possible.
+ */
+
+int cifaddr (int unit, u_int32_t our_adr, u_int32_t his_adr)
+{
+ struct ifreq ifr;
+
+ if (kernel_version < KVERSION(2,1,16)) {
+/*
+ * Delete the route through the device
+ */
+ struct rtentry rt;
+ memset (&rt, '\0', sizeof (rt));
+
+ SET_SA_FAMILY (rt.rt_dst, AF_INET);
+ SET_SA_FAMILY (rt.rt_gateway, AF_INET);
+ rt.rt_dev = ifname;
+
+ SIN_ADDR(rt.rt_gateway) = 0;
+ SIN_ADDR(rt.rt_dst) = his_adr;
+ rt.rt_flags = RTF_UP | RTF_HOST;
+
+ if (kernel_version > KVERSION(2,1,0)) {
+ SET_SA_FAMILY (rt.rt_genmask, AF_INET);
+ SIN_ADDR(rt.rt_genmask) = -1L;
+ }
+
+ if (ioctl(sock_fd, SIOCDELRT, &rt) < 0 && errno != ESRCH) {
+ if (still_ppp() && ! ok_error (errno))
+ error("ioctl(SIOCDELRT) device route: %m(%d)", errno);
+ return (0);
+ }
+ }
+
+ /* This way it is possible to have an IPX-only or IPv6-only interface */
+ memset(&ifr, 0, sizeof(ifr));
+ SET_SA_FAMILY(ifr.ifr_addr, AF_INET);
+ strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+
+ if (ioctl(sock_fd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
+ if (! ok_error (errno)) {
+ error("ioctl(SIOCSIFADDR): %m(%d)", errno);
+ return 0;
+ }
+ }
+
+ our_old_addr = our_adr;
+
+ return 1;
+}
+
+//===================================================================
+
+#if 1
+/*
+ * /proc/net/route parsing stuff.
+ */
+
+#define ROUTE_MAX_COLS 12
+FILE *route_fd = (FILE *) 0;
+static char route_buffer[512];
+static int route_dev_col, route_dest_col, route_gw_col;
+static int route_flags_col, route_mask_col;
+static int route_num_cols;
+
+static int open_route_table (void);
+static void close_route_table (void);
+static int read_route_table (struct rtentry *rt);
+static char route_delims[] = " \t\n";
+
+/********************************************************************
+ *
+ * close_route_table - close the interface to the route table
+ */
+// copy from pppd/sys-linux.c by tallest
+static void close_route_table (void)
+{
+ if (route_fd != (FILE *) 0) {
+ fclose (route_fd);
+ route_fd = (FILE *) 0;
+ }
+}
+
+/********************************************************************
+ *
+ * read_route_table - read the next entry from the route table
+ */
+// copy from pppd/sys-linux.c by tallest
+static int read_route_table(struct rtentry *rt)
+{
+ char *cols[ROUTE_MAX_COLS], *p;
+ int col;
+
+ memset (rt, '\0', sizeof (struct rtentry));
+
+ if (fgets (route_buffer, sizeof (route_buffer), route_fd) == (char *) 0)
+ return 0;
+
+ p = route_buffer;
+ for (col = 0; col < route_num_cols; ++col) {
+ cols[col] = strtok(p, route_delims);
+ if (cols[col] == NULL)
+ return 0; /* didn't get enough columns */
+ p = NULL;
+ }
+
+ SIN_ADDR(rt->rt_dst) = strtoul(cols[route_dest_col], NULL, 16);
+ SIN_ADDR(rt->rt_gateway) = strtoul(cols[route_gw_col], NULL, 16);
+ SIN_ADDR(rt->rt_genmask) = strtoul(cols[route_mask_col], NULL, 16);
+
+ rt->rt_flags = (short) strtoul(cols[route_flags_col], NULL, 16);
+ rt->rt_dev = cols[route_dev_col];
+
+ return 1;
+}
+
+/********************************************************************
+ *
+ * open_route_table - open the interface to the route table
+ */
+// copy from pppd/sys-linux.c by tallest
+
+static int open_route_table (void)
+{
+ char *path;
+
+ close_route_table();
+
+ //path = path_to_procfs("/net/route");
+ //route_fd = fopen (path, "r");
+ route_fd = fopen ("proc/net/route", "r");
+ if (route_fd == NULL) {
+ error("can't open routing table");
+ return 0;
+ }
+
+ route_dev_col = 0; /* default to usual columns */
+ route_dest_col = 1;
+ route_gw_col = 2;
+ route_flags_col = 3;
+ route_mask_col = 7;
+ route_num_cols = 8;
+
+ /* parse header line */
+ if (fgets(route_buffer, sizeof(route_buffer), route_fd) != 0) {
+ char *p = route_buffer, *q;
+ int col;
+ for (col = 0; col < ROUTE_MAX_COLS; ++col) {
+ int used = 1;
+ if ((q = strtok(p, route_delims)) == 0)
+ break;
+ if (strcasecmp(q, "iface") == 0)
+ route_dev_col = col;
+ else if (strcasecmp(q, "destination") == 0)
+ route_dest_col = col;
+ else if (strcasecmp(q, "gateway") == 0)
+ route_gw_col = col;
+ else if (strcasecmp(q, "flags") == 0)
+ route_mask_col = col;
+ else
+ used = 0;
+ if (used && col >= route_num_cols)
+ route_num_cols = col + 1;
+ p = NULL;
+ }
+ }
+
+ return 1;
+}
+
+/********************************************************************
+ *
+ * defaultroute_exists - determine if there is a default route
+ */
+// copy from pppd/sys-linux.c by tallest
+static int defaultroute_exists (struct rtentry *rt)
+{
+ int result = 0;
+
+ if (!open_route_table())
+ return 0;
+
+ while (read_route_table(rt) != 0) {
+ if ((rt->rt_flags & RTF_UP) == 0)
+ continue;
+
+ if (kernel_version > KVERSION(2,1,0) && SIN_ADDR(rt->rt_genmask) != 0)
+ continue;
+ if (SIN_ADDR(rt->rt_dst) == 0L) {
+ result = 1;
+ break;
+ }
+ }
+
+ close_route_table();
+ return result;
+}
+
+/********************************************************************
+ *
+ * sifdefaultroute - assign a default route through the address given.
+ */
+// copy from pppd/sys_linux.c by tallest
+int
+sifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway)
+{
+ struct rtentry rt;
+
+ if (defaultroute_exists(&rt) && strcmp(rt.rt_dev, ifname) != 0) {
+ u_int32_t old_gateway = SIN_ADDR(rt.rt_gateway);
+
+ if (old_gateway != gateway)
+ error("not replacing existing default route to %s [%I]",
+ rt.rt_dev, old_gateway);
+ return 0;
+ }
+
+ memset (&rt, '\0', sizeof (rt));
+ SET_SA_FAMILY (rt.rt_dst, AF_INET);
+ SET_SA_FAMILY (rt.rt_gateway, AF_INET);
+
+ if (kernel_version > KVERSION(2,1,0)) {
+ SET_SA_FAMILY (rt.rt_genmask, AF_INET);
+ SIN_ADDR(rt.rt_genmask) = 0L;
+ }
+
+ SIN_ADDR(rt.rt_gateway) = gateway;
+
+ rt.rt_flags = RTF_UP | RTF_GATEWAY;
+ if (ioctl(sock_fd, SIOCADDRT, &rt) < 0) {
+ if ( ! ok_error ( errno ))
+ error("default route ioctl(SIOCADDRT): %m(%d)", errno);
+ return 0;
+ }
+
+ //default_route_gateway = gateway;
+ return 1;
+}
+#endif
+//===================================================================
+
+
+/********************************************************************
+ *
+ * open_loopback - open the device we use for getting packets
+ * in demand mode. Under Linux, we use a pty master/slave pair.
+ */
+int
+open_ppp_loopback(void)
+{
+ int flags;
+
+ looped = 1;
+ if (new_style_driver) {
+ /* allocate ourselves a ppp unit */
+ if (make_ppp_unit() < 0)
+ die(1);
+ set_flags(ppp_dev_fd, SC_LOOP_TRAFFIC);
+ set_kdebugflag(kdebugflag);
+ ppp_fd = -1;
+ return ppp_dev_fd;
+ }
+
+ if (!get_pty(&master_fd, &slave_fd, loop_name, 0))
+ fatal("No free pty for loopback");
+ SYSDEBUG(("using %s for loopback", loop_name));
+
+ set_ppp_fd(slave_fd);
+
+ flags = fcntl(master_fd, F_GETFL);
+ if (flags == -1 ||
+ fcntl(master_fd, F_SETFL, flags | O_NONBLOCK) == -1)
+ warn("couldn't set master loopback to nonblock: %m(%d)", errno);
+
+ flags = fcntl(ppp_fd, F_GETFL);
+ if (flags == -1 ||
+ fcntl(ppp_fd, F_SETFL, flags | O_NONBLOCK) == -1)
+ warn("couldn't set slave loopback to nonblock: %m(%d)", errno);
+
+ if (ioctl(ppp_fd, TIOCSETD, &ppp_disc) < 0)
+ fatal("ioctl(TIOCSETD): %m(%d)", errno);
+/*
+ * Find out which interface we were given.
+ */
+ if (ioctl(ppp_fd, PPPIOCGUNIT, &ifunit) < 0)
+ fatal("ioctl(PPPIOCGUNIT): %m(%d)", errno);
+/*
+ * Enable debug in the driver if requested.
+ */
+ set_kdebugflag (kdebugflag);
+
+ return master_fd;
+}
+
+/********************************************************************
+ *
+ * restore_loop - reattach the ppp unit to the loopback.
+ *
+ * The kernel ppp driver automatically reattaches the ppp unit to
+ * the loopback if the serial port is set to a line discipline other
+ * than ppp, or if it detects a modem hangup. The former will happen
+ * in disestablish_ppp if the latter hasn't already happened, so we
+ * shouldn't need to do anything.
+ *
+ * Just to be sure, set the real serial port to the normal discipline.
+ */
+
+void
+restore_loop(void)
+{
+ looped = 1;
+ if (new_style_driver) {
+ set_flags(ppp_dev_fd, get_flags(ppp_dev_fd) | SC_LOOP_TRAFFIC);
+ return;
+ }
+ if (ppp_fd != slave_fd) {
+ (void) ioctl(ppp_fd, TIOCSETD, &tty_disc);
+ set_ppp_fd(slave_fd);
+ }
+}
+
+/********************************************************************
+ *
+ * sifnpmode - Set the mode for handling packets for a given NP.
+ */
+
+int
+sifnpmode(u, proto, mode)
+ int u;
+ int proto;
+ enum NPmode mode;
+{
+ struct npioctl npi;
+
+ npi.protocol = proto;
+ npi.mode = mode;
+ if (ioctl(ppp_dev_fd, PPPIOCSNPMODE, (caddr_t) &npi) < 0) {
+ if (! ok_error (errno))
+ error("ioctl(PPPIOCSNPMODE, %d, %d): %m (%d)",
+ proto, mode, errno);
+ return 0;
+ }
+ return 1;
+}
+
+/*
+ * Use the hostname as part of the random number seed.
+ */
+int
+get_host_seed()
+{
+ int h;
+ char *p = hostname;
+
+ h = 407;
+ for (p = hostname; *p != 0; ++p)
+ h = h * 37 + *p;
+ return h;
+}