X-Git-Url: http://git.ozlabs.org/?p=ppp.git;a=blobdiff_plain;f=pppd%2Fsys-linux.c;h=7cae7ce780f58b5bee07710e298ab6fb2ab842b2;hp=34830f06ba0a11e94433b814397e00dd553071b5;hb=2ab2f6e584f5a0d5a23c180644e4ce7fd1f759ae;hpb=416f33f79891785c39465e6b3f1010ee92fb78aa diff --git a/pppd/sys-linux.c b/pppd/sys-linux.c index 34830f0..7cae7ce 100644 --- a/pppd/sys-linux.c +++ b/pppd/sys-linux.c @@ -18,15 +18,14 @@ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ -/* - * TODO: - */ - #include #include #include #include #include +#include +#include +#include #include #include @@ -38,34 +37,118 @@ #include #include #include +#include +#include +#include + +/* 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 /* glibc 2 conflicts with linux/types.h */ #include -#include #include -#include -#include +#include +#include +#else +#include +#include +#include +#include #include +#endif #include +#include + +#include +#include #include "pppd.h" #include "fsm.h" #include "ipcp.h" +#include "patchlevel.h" + +#ifdef IPX_CHANGE +#include "ipxcp.h" +#if __GLIBC__ >= 2 && \ + !(defined(__powerpc__) && __GLIBC__ == 2 && __GLIBC_MINOR__ == 0) +#include +#else +#include +#endif +#endif /* IPX_CHANGE */ -static int initdisc = -1; /* Initial TTY discipline */ -static int prev_kdebugflag = 0; +#ifdef LOCKLIB +#include +#endif -static int restore_term; /* 1 => we've munged the terminal */ -static struct termios inittermios; /* Initial TTY termios */ +#ifndef RTF_DEFAULT /* Normally in from */ +#define RTF_DEFAULT 0 +#endif -int sockfd; /* socket for doing interface ioctls */ +/* We can get an EIO error on an ioctl if the modem has hung up */ +#define ok_error(num) ((num)==EIO) -static int driver_version = 0; +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 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 has_proxy_arp = 0; +static int driver_version = 0; static int driver_modification = 0; -static int driver_patch = 0; +static int driver_patch = 0; +static int driver_is_old = 0; +static int restore_term = 0; /* 1 => we've munged the terminal */ +static struct termios inittermios; /* Initial TTY termios */ -static char *lock_file; +static char loop_name[20]; +static unsigned char inbuf[512]; /* buffer for chars read from loopback */ -#define MAX_IFS 32 +static int if_is_up; /* Interface has been marked up */ +static u_int32_t default_route_gateway; /* Gateway for default route added */ +static u_int32_t proxy_arp_addr; /* Addr for proxy arp entry added */ +static char proxy_arp_dev[16]; /* Device for proxy arp entry */ + +static struct utsname utsname; /* for the kernel version */ +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) + +/* Prototypes for procedures local to this file. */ +static int get_flags (void); +static void set_flags (int flags); +static int translate_speed (int bps); +static int baud_rate_of (int speed); +static char *path_to_route (void); +static void close_route_table (void); +static int open_route_table (void); +static int read_route_table (struct rtentry *rt); +static int defaultroute_exists (struct rtentry *rt); +static int get_ether_addr (u_int32_t ipaddr, struct sockaddr *hwaddr, + char *name, int namelen); +static void decode_version (char *buf, int *version, int *mod, int *patch); +static int set_kdebugflag(int level); +static int ppp_registered(void); + +extern u_char inpacket_buf[]; /* borrowed from main.c */ /* * SET_SA_FAMILY - set the sa_family field of a struct sockaddr, @@ -77,140 +160,313 @@ static char *lock_file; addr.sa_family = (family); /* + * Determine if the PPP connection should still be present. + */ + +extern int hungup; + +static void set_ppp_fd (int new_fd) +{ + SYSDEBUG ((LOG_DEBUG, "setting ppp_fd to %d\n", new_fd)); + ppp_fd = new_fd; +} + +static int still_ppp(void) +{ + 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 (void) +{ + int flags; + + if (ioctl(ppp_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 flags) +{ + SYSDEBUG ((LOG_DEBUG, "set flags = %x\n", flags)); + + if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &flags) < 0) { + if (! ok_error (errno) ) + fatal("ioctl(PPPIOCSFLAGS, %x): %m(%d)", flags, errno); + } +} + +/******************************************************************** + * * sys_init - System-dependent initialization. */ void sys_init(void) { + int osmaj, osmin, ospatch; + openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP); setlogmask(LOG_UPTO(LOG_INFO)); if (debug) setlogmask(LOG_UPTO(LOG_DEBUG)); - - /* Get an internet socket for doing socket ioctl's on. */ - if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { - syslog(LOG_ERR, "Couldn't create IP socket: %m"); - die(1); + + /* Get an internet socket for doing socket ioctls. */ + sock_fd = socket(AF_INET, SOCK_DGRAM, 0); + if (sock_fd < 0) { + if ( ! ok_error ( errno )) + fatal("Couldn't create IP socket: %m(%d)", errno); } + + FD_ZERO(&in_fds); + max_in_fd = 0; + + uname(&utsname); + osmaj = osmin = ospatch = 0; + sscanf(utsname.release, "%d.%d.%d", &osmaj, &osmin, &ospatch); + kernel_version = KVERSION(osmaj, osmin, ospatch); } +/******************************************************************** + * + * 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) +{ /* - * note_debug_level - note a change in the debug level. + * Take down the device + */ + if (if_is_up) + sifdown(0); +/* + * Delete any routes through the device. + */ + if (default_route_gateway != 0) + cifdefaultroute(0, 0, default_route_gateway); + + if (has_proxy_arp) + cifproxyarp(0, proxy_arp_addr); +} + +/******************************************************************** + * + * sys_close - Clean up in a child process before execing. */ -void note_debug_level (void) +void +sys_close(void) { - if (debug) { - syslog(LOG_INFO, "Debug turned ON, Level %d", debug); - setlogmask(LOG_UPTO(LOG_DEBUG)); - } else { - setlogmask(LOG_UPTO(LOG_WARNING)); - } + 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 */ -int set_kdebugflag (int requested_level) +static int set_kdebugflag (int requested_level) { - if (ioctl(fd, PPPIOCGDEBUG, &prev_kdebugflag) < 0) { - syslog(LOG_ERR, "ioctl(PPPIOCGDEBUG): %m"); + if (ioctl(ppp_fd, PPPIOCSDEBUG, &requested_level) < 0) { + if ( ! ok_error (errno) ) + error("ioctl(PPPIOCSDEBUG): %m"); return (0); } - - if (prev_kdebugflag != requested_level) { - if (ioctl(fd, PPPIOCSDEBUG, &requested_level) < 0) { - syslog (LOG_ERR, "ioctl(PPPIOCSDEBUG): %m"); - return (0); - } - syslog(LOG_INFO, "set kernel debugging level to %d", requested_level); - } + SYSDEBUG ((LOG_INFO, "set kernel debugging level to %d", + requested_level)); return (1); } -/* +/******************************************************************** + * * establish_ppp - Turn the serial port into a ppp interface. */ -void establish_ppp (void) +int establish_ppp (int tty_fd) { - int pppdisc = N_PPP; - int sig = SIGIO; - - if (ioctl(fd, TIOCEXCL, 0) < 0) { - syslog (LOG_WARNING, "ioctl(TIOCEXCL): %m"); + int x; +/* + * The current PPP device will be the tty file. + */ + set_ppp_fd (tty_fd); +/* + * Ensure that the tty device is in exclusive mode. + */ + if (ioctl(tty_fd, TIOCEXCL, 0) < 0) { + if ( ! ok_error ( errno )) + warn("ioctl(TIOCEXCL): %m"); } - - if (ioctl(fd, TIOCGETD, &initdisc) < 0) { - syslog(LOG_ERR, "ioctl(TIOCGETD): %m"); - die (1); +/* + * Demand mode - prime the old ppp device to relinquish the unit. + */ + if (demand && ioctl(slave_fd, PPPIOCXFERUNIT, 0) < 0) + fatal("ioctl(transfer ppp unit): %m(%d)", errno); +/* + * Set the current tty to the PPP discpline + */ + if (ioctl(ppp_fd, TIOCSETD, &ppp_disc) < 0) { + if ( ! ok_error (errno) ) + fatal("ioctl(TIOCSETD): %m(%d)", errno); } - - if (ioctl(fd, TIOCSETD, &pppdisc) < 0) { - syslog(LOG_ERR, "ioctl(TIOCSETD): %m"); - die (1); +/* + * Find out which interface we were given. + */ + if (ioctl(ppp_fd, PPPIOCGUNIT, &x) < 0) { + if ( ! ok_error (errno)) + fatal("ioctl(PPPIOCGUNIT): %m(%d)", errno); } - if (ioctl(fd, PPPIOCGUNIT, &ifunit) < 0) { - syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m"); - die (1); +/* + * Check that we got the same unit again. + */ + if (demand) { + if (x != ifunit) + fatal("transfer_ppp failed: wanted unit %d, got %d", ifunit, x); } - set_kdebugflag (kdebugflag); + ifunit = x; +/* + * Enable debug in the driver if requested. + */ + if (!demand) + set_kdebugflag (kdebugflag); - syslog (LOG_NOTICE, "Using version %d.%d.%d of PPP driver", - driver_version, driver_modification, driver_patch); -} + set_flags (get_flags() & ~(SC_RCV_B7_0 | SC_RCV_B7_1 | + SC_RCV_EVNP | SC_RCV_ODDP)); + SYSDEBUG ((LOG_NOTICE, "Using version %d.%d.%d of PPP driver", + driver_version, driver_modification, driver_patch)); /* + * Fetch the initial file flags and reset blocking mode on the file. + */ + initfdflags = fcntl(ppp_fd, F_GETFL); + + if (initfdflags == -1 || + fcntl(ppp_fd, F_SETFL, initfdflags | O_NONBLOCK) == -1) { + if ( ! ok_error (errno)) + warn("Couldn't set device to non-blocking mode: %m"); + } + + return ppp_fd; +} + +/******************************************************************** + * * disestablish_ppp - Restore the serial port to normal operation. * This shouldn't call die() because it's called from die(). */ -void disestablish_ppp(void) +void disestablish_ppp(int tty_fd) +{ + int nout; + + if (!hungup) { +/* + * Flush the tty output buffer so that the TIOCSETD doesn't hang. + * We may have to do this several times because the tcflush only + * affects the serial driver, and may trigger the ppp driver to + * supply more data to the serial driver. + */ + do { + if (tcflush(tty_fd, TCIOFLUSH) < 0) + break; + nout = 0; + } while (ioctl(tty_fd, TIOCOUTQ, &nout) >= 0 && nout > 0); +/* + * Restore the previous line discipline + */ + if (ioctl(tty_fd, TIOCSETD, &tty_disc) < 0) { + if ( ! ok_error (errno)) + error("ioctl(TIOCSETD, N_TTY): %m"); + } + + if (ioctl(tty_fd, TIOCNXCL, 0) < 0) { + if ( ! ok_error (errno)) + warn("ioctl(TIOCNXCL): %m(%d)", errno); + } + + /* Reset non-blocking mode on fd. */ + if (initfdflags != -1 && fcntl(tty_fd, F_SETFL, initfdflags) < 0) { + if ( ! ok_error (errno)) + warn("Couldn't restore device fd flags: %m"); + } + } + initfdflags = -1; +} + +/******************************************************************** + * + * clean_check - Fetch the flags for the device and generate + * appropriate error messages. + */ +void clean_check(void) { int x; char *s; - if (initdisc >= 0) { - set_kdebugflag (prev_kdebugflag); - /* - * Check whether the link seems not to be 8-bit clean. - */ - if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) == 0) { + 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 = "bit 7 set to 1"; + case SC_RCV_B7_0 | SC_RCV_EVNP: + case SC_RCV_B7_0 | SC_RCV_ODDP: + case SC_RCV_B7_0 | SC_RCV_ODDP | SC_RCV_EVNP: + s = "all had bit 7 set to 1"; break; + case SC_RCV_B7_1: - s = "bit 7 set to 0"; + case SC_RCV_B7_1 | SC_RCV_EVNP: + case SC_RCV_B7_1 | SC_RCV_ODDP: + case SC_RCV_B7_1 | SC_RCV_ODDP | SC_RCV_EVNP: + s = "all had bit 7 set to 0"; break; + case SC_RCV_EVNP: - s = "odd parity"; + s = "all had odd parity"; break; + case SC_RCV_ODDP: - s = "even parity"; + s = "all had even parity"; break; } + if (s != NULL) { - syslog(LOG_WARNING, "Serial link is not 8-bit clean:"); - syslog(LOG_WARNING, "All received characters had %s", s); + warn("Receive serial link is not 8-bit clean:"); + warn("Problem: %s", s); } } - - if (ioctl(fd, TIOCSETD, &initdisc) < 0) - syslog(LOG_ERR, "ioctl(TIOCSETD): %m"); - - if (ioctl(fd, TIOCNXCL, 0) < 0) - syslog (LOG_WARNING, "ioctl(TIOCNXCL): %m"); - - initdisc = -1; } } + /* * List of valid speeds. */ + struct speed { int speed_int, speed_val; } speeds[] = { @@ -268,182 +524,272 @@ struct speed { #ifdef B38400 { 38400, B38400 }, #endif +#ifdef B57600 + { 57600, B57600 }, +#endif +#ifdef B115200 + { 115200, B115200 }, +#endif #ifdef EXTA { 19200, EXTA }, #endif #ifdef EXTB { 38400, EXTB }, #endif -#ifdef B57600 - { 57600, B57600 }, +#ifdef B230400 + { 230400, B230400 }, #endif -#ifdef B115200 - { 115200, B115200 }, +#ifdef B460800 + { 460800, B460800 }, #endif { 0, 0 } }; -/* +/******************************************************************** + * * Translate from bits/second to a speed_t. */ -int translate_speed (int bps) + +static int translate_speed (int bps) { struct speed *speedp; - if (bps == 0) - return 0; - for (speedp = speeds; speedp->speed_int; speedp++) - if (bps == speedp->speed_int) - return speedp->speed_val; - syslog(LOG_WARNING, "speed %d not supported", bps); + if (bps != 0) { + for (speedp = speeds; speedp->speed_int; speedp++) { + if (bps == speedp->speed_int) + return speedp->speed_val; + } + warn("speed %d not supported", bps); + } return 0; } -/* +/******************************************************************** + * * Translate from a speed_t to bits/second. */ -int baud_rate_of (int speed) + +static int baud_rate_of (int speed) { struct speed *speedp; - - if (speed == 0) - return 0; - for (speedp = speeds; speedp->speed_int; speedp++) - if (speed == speedp->speed_val) - return speedp->speed_int; + + if (speed != 0) { + for (speedp = speeds; speedp->speed_int; speedp++) { + if (speed == speedp->speed_val) + return speedp->speed_int; + } + } return 0; } -/* +/******************************************************************** + * * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity, * at the requested speed, etc. If `local' is true, set CLOCAL * regardless of whether the modem option was specified. */ -void set_up_tty (int fd, int local) + +void set_up_tty(int tty_fd, int local) { - int speed, x; + int speed; struct termios tios; - if (tcgetattr(fd, &tios) < 0) { - syslog(LOG_ERR, "tcgetattr: %m"); - die(1); + setdtr(tty_fd, 1); + if (tcgetattr(tty_fd, &tios) < 0) { + if (!ok_error(errno)) + fatal("tcgetattr: %m(%d)", errno); + return; } - + if (!restore_term) inittermios = tios; - - tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL); - if (crtscts == 1) - tios.c_cflag |= CRTSCTS; - else if (crtscts < 0) - tios.c_cflag &= ~CRTSCTS; - - tios.c_cflag |= CS8 | CREAD | HUPCL; - - if (local || !modem) - tios.c_cflag |= CLOCAL; + + tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL); + tios.c_cflag |= CS8 | CREAD | HUPCL; tios.c_iflag = IGNBRK | IGNPAR; tios.c_oflag = 0; tios.c_lflag = 0; tios.c_cc[VMIN] = 1; tios.c_cc[VTIME] = 0; + + if (local || !modem) + tios.c_cflag ^= (CLOCAL | HUPCL); - if (crtscts == 2) { - tios.c_iflag |= IXOFF; + switch (crtscts) { + case 1: + tios.c_cflag |= CRTSCTS; + break; + + case -2: + tios.c_iflag |= IXON | IXOFF; tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */ tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */ - } + break; + + case -1: + tios.c_cflag &= ~CRTSCTS; + break; + default: + break; + } + speed = translate_speed(inspeed); if (speed) { - cfsetospeed(&tios, speed); - cfsetispeed(&tios, speed); - } else { - speed = cfgetospeed(&tios); - /* - * We can't proceed if the serial port speed is B0, - * since that implies that the serial port is disabled. - */ - if (speed == B0) { - syslog(LOG_ERR, "Baud rate for %s is 0; need explicit baud rate", - devnam); - die(1); - } + cfsetospeed (&tios, speed); + cfsetispeed (&tios, speed); } - - if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) { - syslog(LOG_ERR, "tcsetattr: %m"); - die(1); +/* + * We can't proceed if the serial port speed is B0, + * since that implies that the serial port is disabled. + */ + else { + speed = cfgetospeed(&tios); + if (speed == B0) + fatal("Baud rate for %s is 0; need explicit baud rate", devnam); } - baud_rate = baud_rate_of(speed); - restore_term = TRUE; + if (tcsetattr(tty_fd, TCSAFLUSH, &tios) < 0) + if (!ok_error(errno)) + fatal("tcsetattr: %m"); + + baud_rate = baud_rate_of(speed); + restore_term = 1; } -/* +/******************************************************************** + * * setdtr - control the DTR line on the serial port. * This is called from die(), so it shouldn't call die(). */ -void setdtr (int fd, int on) + +void setdtr (int tty_fd, int on) { int modembits = TIOCM_DTR; - ioctl(fd, (on? TIOCMBIS: TIOCMBIC), &modembits); + ioctl(tty_fd, (on ? TIOCMBIS : TIOCMBIC), &modembits); } -/* +/******************************************************************** + * * restore_tty - restore the terminal to the saved settings. */ -void restore_tty (void) +void restore_tty (int tty_fd) { if (restore_term) { - if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0) - if (errno != ENXIO) - syslog(LOG_WARNING, "tcsetattr: %m"); restore_term = 0; +/* + * Turn off echoing, because otherwise we can get into + * a loop with the tty and the modem echoing to each other. + * We presume we are the sole user of this tty device, so + * when we close it, it will revert to its defaults anyway. + */ + if (!default_device) + inittermios.c_lflag &= ~(ECHO | ECHONL); + + if (tcsetattr(tty_fd, TCSAFLUSH, &inittermios) < 0) { + if (! ok_error (errno)) + warn("tcsetattr: %m"); + } } } -/* +/******************************************************************** + * * output - Output PPP packet. */ void output (int unit, unsigned char *p, int len) { - if (unit != 0) - MAINDEBUG((LOG_WARNING, "output: unit != 0!")); - if (debug) - log_packet(p, len, "sent "); + dbglog("sent %P", p, len); - if (write(fd, p, len) < 0) { - syslog(LOG_ERR, "write: %m"); - die(1); + if (write(ppp_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 on fd, +/******************************************************************** + * + * 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) + +void wait_input(struct timeval *timo) { fd_set ready; int n; - FD_ZERO(&ready); - FD_SET(fd, &ready); - n = select(fd+1, &ready, NULL, &ready, timo); - if (n < 0 && errno != EINTR) { - syslog(LOG_ERR, "select: %m"); - die(1); - } + ready = in_fds; + n = select(max_in_fd + 1, &ready, NULL, &ready, 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); +} + +#if 0 +/******************************************************************** + * + * wait_loop_output - wait until there is data available on the + * loopback, for the length of time specified by *timo (indefinite + * if timo is NULL). + */ +void wait_loop_output(timo) + struct timeval *timo; +{ + fd_set ready; + int n; + + FD_ZERO(&ready); + FD_SET(master_fd, &ready); + n = select(master_fd + 1, &ready, NULL, &ready, timo); + if (n < 0 && errno != EINTR) + fatal("select: %m(%d)", errno); +} + +/******************************************************************** + * + * wait_time - wait for a given length of time or until a + * signal is received. + */ + +void wait_time(timo) + struct timeval *timo; +{ + int n; + + n = select(0, NULL, NULL, NULL, timo); + if (n < 0 && errno != EINTR) + fatal("select: %m(%d)", errno); +} +#endif + +/******************************************************************** + * * read_packet - get a PPP packet from the serial device. */ @@ -451,703 +797,679 @@ int read_packet (unsigned char *buf) { int len; - len = read(fd, buf, PPP_MTU + PPP_HDRLEN); + len = read(ppp_fd, buf, PPP_MTU + PPP_HDRLEN); if (len < 0) { - if (errno == EWOULDBLOCK) { + if (errno == EWOULDBLOCK || errno == EIO) return -1; - } - syslog(LOG_ERR, "read(fd): %m"); - die(1); + fatal("read: %m(%d)", errno); } return len; } -/* +/******************************************************************** + * + * 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 = read(master_fd, inbuf, sizeof(inbuf)); + + while (n > 0) { + if (loop_chars(inbuf, n)) + rv = 1; + n = read(master_fd, inbuf, sizeof(inbuf)); + } + + if (n == 0) + fatal("eof on loopback"); + + if (errno != EWOULDBLOCK) + fatal("read from loopback: %m(%d)", errno); + + return rv; +} + +/******************************************************************** + * * ppp_send_config - configure the transmit characteristics of * the ppp interface. */ + void ppp_send_config (int unit,int mtu,u_int32_t asyncmap,int pcomp,int accomp) { u_int x; struct ifreq ifr; - MAINDEBUG ((LOG_DEBUG, "send_config: mtu = %d\n", mtu)); - strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name)); + SYSDEBUG ((LOG_DEBUG, "send_config: mtu = %d\n", mtu)); +/* + * Ensure that the link is still up. + */ + if (!still_ppp()) + return; +/* + * Set the MTU and other parameters for the ppp device + */ + memset (&ifr, '\0', sizeof (ifr)); + strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name)); ifr.ifr_mtu = mtu; - if (ioctl(sockfd, SIOCSIFMTU, (caddr_t) &ifr) < 0) { - syslog(LOG_ERR, "ioctl(SIOCSIFMTU): %m"); - quit(); - } - - MAINDEBUG ((LOG_DEBUG, "send_config: asyncmap = %lx\n", asyncmap)); - if (ioctl(fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0) { - syslog(LOG_ERR, "ioctl(PPPIOCSASYNCMAP): %m"); - quit(); + + if (ioctl(sock_fd, SIOCSIFMTU, (caddr_t) &ifr) < 0) + fatal("ioctl(SIOCSIFMTU): %m(%d)", errno); + + SYSDEBUG ((LOG_DEBUG, "send_config: asyncmap = %lx\n", asyncmap)); + if (ioctl(ppp_fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0) { + if (!ok_error(errno)) + fatal("ioctl(PPPIOCSASYNCMAP): %m(%d)", errno); + return; } - if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) { - syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m"); - quit(); - } - + x = get_flags(); x = pcomp ? x | SC_COMP_PROT : x & ~SC_COMP_PROT; x = accomp ? x | SC_COMP_AC : x & ~SC_COMP_AC; - - MAINDEBUG ((LOG_DEBUG, "send_config: flags = %x\n", x)); - if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) { - syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m"); - quit(); - } + x = sync_serial ? x | SC_SYNC : x & ~SC_SYNC; + set_flags(x); } -/* +/******************************************************************** + * * ppp_set_xaccm - set the extended transmit ACCM for the interface. */ + void ppp_set_xaccm (int unit, ext_accm accm) { - MAINDEBUG ((LOG_DEBUG, "set_xaccm: %08lx %08lx %08lx %08lx\n", + SYSDEBUG ((LOG_DEBUG, "set_xaccm: %08lx %08lx %08lx %08lx\n", accm[0], accm[1], accm[2], accm[3])); - if (ioctl(fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY) - syslog(LOG_WARNING, "ioctl(set extended ACCM): %m"); + + if (ioctl(ppp_fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY) { + if ( ! ok_error (errno)) + warn("ioctl(set extended ACCM): %m(%d)", errno); + } } -/* +/******************************************************************** + * * ppp_recv_config - configure the receive-side characteristics of * the ppp interface. */ + void ppp_recv_config (int unit,int mru,u_int32_t asyncmap,int pcomp,int accomp) { u_int x; - MAINDEBUG ((LOG_DEBUG, "recv_config: mru = %d\n", mru)); - if (ioctl(fd, PPPIOCSMRU, (caddr_t) &mru) < 0) - syslog(LOG_ERR, "ioctl(PPPIOCSMRU): %m"); - - MAINDEBUG ((LOG_DEBUG, "recv_config: asyncmap = %lx\n", asyncmap)); - if (ioctl(fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0) { - syslog(LOG_ERR, "ioctl(PPPIOCSRASYNCMAP): %m"); - quit(); + SYSDEBUG ((LOG_DEBUG, "recv_config: mru = %d\n", mru)); +/* + * If we were called because the link has gone down then there is nothing + * which may be done. Just return without incident. + */ + if (!still_ppp()) + return; +/* + * Set the receiver parameters + */ + if (ioctl(ppp_fd, PPPIOCSMRU, (caddr_t) &mru) < 0) { + if ( ! ok_error (errno)) + error("ioctl(PPPIOCSMRU): %m(%d)", errno); } - - if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) { - syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m"); - quit(); + + SYSDEBUG ((LOG_DEBUG, "recv_config: asyncmap = %lx\n", asyncmap)); + if (ioctl(ppp_fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0) { + if (!ok_error(errno)) + error("ioctl(PPPIOCSRASYNCMAP): %m(%d)", errno); } + x = get_flags(); x = !accomp? x | SC_REJ_COMP_AC: x &~ SC_REJ_COMP_AC; - MAINDEBUG ((LOG_DEBUG, "recv_config: flags = %x\n", x)); - if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) { - syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m"); - quit(); - } + set_flags (x); } -/* +/******************************************************************** + * * 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; - return ioctl(fd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0; - } + if (ioctl(ppp_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) - { - int x; - - if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) - { - syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m"); - } - else - { +{ + if (still_ppp()) { + int x = get_flags(); x = isopen? x | SC_CCP_OPEN : x &~ SC_CCP_OPEN; x = isup? x | SC_CCP_UP : x &~ SC_CCP_UP; + set_flags (x); + } +} - if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) - { - syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m"); - } - } - } - -/* - * 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; - - if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) - { - syslog(LOG_ERR, "ioctl(PPPIOCGFLAGS): %m"); - return 0; - } - return x & SC_DC_FERROR; - } - -/* - * sifvjcomp - config tcp header compression +/******************************************************************** + * + * 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_fd, PPPIOCGIDLE, ip) >= 0; +} -int sifvjcomp (int u, int vjcomp, int cidcomp, int maxcid) - { - u_int x; - - if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) - { - syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m"); - return 0; - } - - x = vjcomp ? x | SC_COMP_TCP : x &~ SC_COMP_TCP; - x = cidcomp ? x & ~SC_NO_TCP_CCID : x | SC_NO_TCP_CCID; - - if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) - { - syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m"); - return 0; - } - - if (vjcomp) - { - if (ioctl (fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) - { - syslog (LOG_ERR, "ioctl(PPPIOCSFLAGS): %m"); - return 0; - } - } - - return 1; - } - -/* - * sifup - Config the interface up and enable IP packets to pass. +/******************************************************************** + * + * get_ppp_stats - return statistics for the link. */ +int +get_ppp_stats(u, stats) + int u; + struct pppd_stats *stats; +{ + struct ifpppstatsreq req; -int sifup (int u) - { - struct ifreq ifr; - - strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name)); - if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) - { - syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m"); - return 0; - } + memset (&req, 0, sizeof (req)); - ifr.ifr_flags |= (IFF_UP | IFF_POINTOPOINT); - if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) - { - syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m"); + 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; - } +} -/* - * sifdown - Config the interface down and disable IP. +/******************************************************************** + * + * 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 sifdown (int u) - { - struct ifreq ifr; - - strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name)); - if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) - { - syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m"); - return 0; - } - - ifr.ifr_flags &= ~IFF_UP; - ifr.ifr_flags |= IFF_POINTOPOINT; - if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) - { - syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m"); - return 0; - } - return 1; - } - -/* - * sifaddr - Config the interface IP addresses and netmask. - */ +int ccp_fatal_error (int unit) +{ + int x = get_flags(); -int sifaddr (int unit, int our_adr, int his_adr, int net_mask) - { - struct ifreq ifr; - struct rtentry 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); + return x & SC_DC_FERROR; +} - strncpy (ifr.ifr_name, ifname, sizeof (ifr.ifr_name)); -/* - * Set our IP address - */ - ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = our_adr; - if (ioctl(sockfd, SIOCSIFADDR, (caddr_t) &ifr) < 0) - { - if (errno != EEXIST) - { - syslog (LOG_ERR, "ioctl(SIOCAIFADDR): %m"); - } - else - { - syslog (LOG_WARNING, "ioctl(SIOCAIFADDR): Address already exists"); - } - return (0); - } -/* - * Set the gateway address - */ - ((struct sockaddr_in *) &ifr.ifr_dstaddr)->sin_addr.s_addr = his_adr; - if (ioctl(sockfd, SIOCSIFDSTADDR, (caddr_t) &ifr) < 0) - { - syslog (LOG_ERR, "ioctl(SIOCSIFDSTADDR): %m"); - return (0); - } -/* - * Set the netmask - */ - if (net_mask != 0) - { - ((struct sockaddr_in *) &ifr.ifr_netmask)->sin_addr.s_addr = net_mask; - if (ioctl(sockfd, SIOCSIFNETMASK, (caddr_t) &ifr) < 0) - { - syslog (LOG_ERR, "ioctl(SIOCSIFNETMASK): %m"); - return (0); - } - } /* - * Add the device route + * path_to_route - determine the path to the proc file system data */ - 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; /* MJC */ - - ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = 0; - ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = his_adr; - rt.rt_flags = RTF_UP | RTF_HOST; +#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; - if (ioctl(sockfd, SIOCADDRT, &rt) < 0) - { - syslog (LOG_ERR, "ioctl(SIOCADDRT) device route: %m"); - return (0); - } - return 1; - } +static char *path_to_route (void); +static int open_route_table (void); +static void close_route_table (void); +static int read_route_table (struct rtentry *rt); -/* - * cifaddr - Clear the interface IP addresses, and delete routes - * through the interface if possible. +/******************************************************************** + * + * path_to_procfs - find the path to the proc file system mount point */ -int cifaddr (int unit, int our_adr, int his_adr) - { - struct rtentry rt; -/* - * Delete the route through the device - */ - memset (&rt, '\0', sizeof (rt)); +static int path_to_procfs (void) +{ + struct mntent *mntent; + FILE *fp; - SET_SA_FAMILY (rt.rt_dst, AF_INET); - SET_SA_FAMILY (rt.rt_gateway, AF_INET); - rt.rt_dev = ifname; /* MJC */ + fp = fopen(MOUNTED, "r"); + if (fp == NULL) { + /* Default the mount location of /proc */ + strlcpy (route_buffer, "/proc", sizeof (route_buffer)); + return 1; + } - ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = 0; - ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = his_adr; - rt.rt_flags = RTF_UP | RTF_HOST; + while ((mntent = getmntent(fp)) != NULL) { + if (strcmp(mntent->mnt_type, MNTTYPE_IGNORE) == 0) + continue; + if (strcmp(mntent->mnt_type, "proc") == 0) + break; + } + fclose (fp); + if (mntent == 0) + return 0; - if (ioctl(sockfd, SIOCDELRT, &rt) < 0) - { - syslog (LOG_ERR, "ioctl(SIOCDELRT) device route: %m"); - return (0); - } + strlcpy(route_buffer, mntent->mnt_dir, sizeof (route_buffer)); return 1; - } - -/* - * path_to_route - determine the path to the proc file system data - */ - -FILE *route_fd = (FILE *) 0; -static char route_buffer [100]; - -static char *path_to_route (void); -static int open_route_table (void); -static void close_route_table (void); -static int read_route_table (struct rtentry *rt); -static int defaultroute_exists (void); +} -/* +/******************************************************************** + * * path_to_route - find the path to the route tables in the proc file system */ static char *path_to_route (void) - { - struct mntent *mntent; - FILE *fp; +{ + if (!path_to_procfs()) { + error("proc file system not mounted"); + return 0; + } + strlcat (route_buffer, "/net/route", sizeof(route_buffer)); + return (route_buffer); +} - fp = fopen (MOUNTED, "r"); - if (fp != 0) - { - while ((mntent = getmntent (fp)) != 0) - { - if (strcmp (mntent->mnt_type, MNTTYPE_IGNORE) == 0) - { - continue; - } - - if (strcmp (mntent->mnt_type, "proc") == 0) - { - strncpy (route_buffer, mntent->mnt_dir, - sizeof (route_buffer)-10); - route_buffer [sizeof (route_buffer)-10] = '\0'; - strcat (route_buffer, "/net/route"); - - fclose (fp); - return (route_buffer); - } - } - fclose (fp); - } - syslog (LOG_ERR, "proc file system not mounted"); - return 0; - } +/******************************************************************** + * + * close_route_table - close the interface to the route table + */ -/* +static void close_route_table (void) +{ + if (route_fd != (FILE *) 0) { + fclose (route_fd); + route_fd = (FILE *) 0; + } +} + +/******************************************************************** + * * open_route_table - open the interface to the route table */ +static char route_delims[] = " \t\n"; static int open_route_table (void) - { +{ char *path; - if (route_fd != (FILE *) 0) - { - close_route_table(); - } + close_route_table(); path = path_to_route(); if (path == NULL) - { return 0; - } route_fd = fopen (path, "r"); - if (route_fd == (FILE *) 0) - { - syslog (LOG_ERR, "can not open %s: %m", path); + if (route_fd == NULL) { + error("can't open %s: %m (%d)", path, errno); return 0; - } - - /* read and discard the header line. */ - if (fgets (route_buffer, sizeof (route_buffer), route_fd) == (char *) 0) - { - close_route_table(); - return 0; - } - return 1; - } + } -/* - * close_route_table - close the interface to the route table - */ + 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_flags_col = col; + else if (strcasecmp(q, "mask") == 0) + route_mask_col = col; + else + used = 0; + if (used && col >= route_num_cols) + route_num_cols = col + 1; + p = NULL; + } + } -static void close_route_table (void) - { - if (route_fd != (FILE *) 0) - { - fclose (route_fd); - route_fd = (FILE *) 0; - } - } + return 1; +} -/* +/******************************************************************** + * * read_route_table - read the next entry from the route table */ -static int read_route_table (struct rtentry *rt) - { - static char delims[] = " \t\n"; - char *dev_ptr, *ptr, *dst_ptr, *gw_ptr, *flag_ptr; +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; - } - - memset (rt, '\0', sizeof (struct rtentry)); + return 0; - dev_ptr = strtok (route_buffer, delims); /* interface name */ - dst_ptr = strtok (NULL, delims); /* destination address */ - gw_ptr = strtok (NULL, delims); /* gateway */ - flag_ptr = strtok (NULL, delims); /* flags */ + 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 */ + } ((struct sockaddr_in *) &rt->rt_dst)->sin_addr.s_addr = - strtoul (dst_ptr, NULL, 16); + strtoul(cols[route_dest_col], NULL, 16); ((struct sockaddr_in *) &rt->rt_gateway)->sin_addr.s_addr = - strtoul (gw_ptr, NULL, 16); + strtoul(cols[route_gw_col], NULL, 16); - rt->rt_flags = (short) strtoul (flag_ptr, NULL, 16); - rt->rt_dev = dev_ptr; + ((struct sockaddr_in *) &rt->rt_genmask)->sin_addr.s_addr = + 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; - } +} -/* +/******************************************************************** + * * defaultroute_exists - determine if there is a default route */ -static int defaultroute_exists (void) - { - struct rtentry rt; - int result = 0; +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) - { + while (read_route_table(rt) != 0) { + if ((rt->rt_flags & RTF_UP) == 0) continue; - } - - if (((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr == 0L) - { - syslog (LOG_ERR, - "ppp not replacing existing default route to %s[%s]", - rt.rt_dev, - inet_ntoa (((struct sockaddr_in *) &rt.rt_gateway)-> - sin_addr.s_addr)); + + if (((struct sockaddr_in *) (&rt->rt_dst))->sin_addr.s_addr == 0L) { result = 1; break; - } - } + } + } + close_route_table(); return result; - } +} /* + * have_route_to - determine if the system has any route to + * a given IP address. `addr' is in network byte order. + * Return value is 1 if yes, 0 if no, -1 if don't know. + * For demand mode to work properly, we have to ignore routes + * through our own interface. + */ +int have_route_to(u_int32_t addr) +{ + struct rtentry rt; + int result = 0; + + if (!open_route_table()) + return -1; /* don't know */ + + while (read_route_table(&rt)) { + if ((rt.rt_flags & RTF_UP) == 0 || strcmp(rt.rt_dev, ifname) == 0) + continue; + if ((addr & ((struct sockaddr_in *)&rt.rt_genmask)->sin_addr.s_addr) + == ((struct sockaddr_in *)&rt.rt_dst)->sin_addr.s_addr) { + result = 1; + break; + } + } + + close_route_table(); + return result; +} + +/******************************************************************** + * * sifdefaultroute - assign a default route through the address given. */ -int sifdefaultroute (int unit, int gateway) - { +int sifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway) +{ struct rtentry rt; - if (defaultroute_exists()) - { - return 0; - } + if (defaultroute_exists(&rt) && strcmp(rt.rt_dev, ifname) != 0) { + struct in_addr old_gateway = + ((struct sockaddr_in *) (&rt.rt_gateway))-> sin_addr; + + if (old_gateway.s_addr != 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); + ((struct sockaddr_in *) &rt.rt_genmask)->sin_addr.s_addr = 0L; + } + ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = gateway; - rt.rt_flags = RTF_UP | RTF_GATEWAY; - if (ioctl(sockfd, SIOCADDRT, &rt) < 0) - { - syslog (LOG_ERR, "default route ioctl(SIOCADDRT): %m"); + rt.rt_flags = RTF_UP | RTF_GATEWAY | RTF_DEFAULT; + 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; - } +} -/* +/******************************************************************** + * * cifdefaultroute - delete a default route through the address given. */ -int cifdefaultroute (int unit, int gateway) - { +int cifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway) +{ struct rtentry rt; - + + default_route_gateway = 0; + + memset (&rt, '\0', sizeof (rt)); SET_SA_FAMILY (rt.rt_dst, AF_INET); SET_SA_FAMILY (rt.rt_gateway, AF_INET); - ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = gateway; - - rt.rt_flags = RTF_UP | RTF_GATEWAY; - if (ioctl(sockfd, SIOCDELRT, &rt) < 0) - { - syslog (LOG_ERR, "default route ioctl(SIOCDELRT): %m"); - return 0; - } + + if (kernel_version > KVERSION(2,1,0)) { + SET_SA_FAMILY (rt.rt_genmask, AF_INET); + ((struct sockaddr_in *) &rt.rt_genmask)->sin_addr.s_addr = 0L; + } + + ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = gateway; + + rt.rt_flags = RTF_UP | RTF_GATEWAY | RTF_DEFAULT; + if (ioctl(sock_fd, SIOCDELRT, &rt) < 0 && errno != ESRCH) { + if (still_ppp()) { + if ( ! ok_error ( errno )) + error("default route ioctl(SIOCDELRT): %m (%d)", errno); + return 0; + } + } + return 1; - } +} -/* +/******************************************************************** + * * sifproxyarp - Make a proxy ARP entry for the peer. */ int sifproxyarp (int unit, u_int32_t his_adr) - { +{ struct arpreq arpreq; - memset (&arpreq, '\0', sizeof(arpreq)); + if (has_proxy_arp == 0) { + memset (&arpreq, '\0', sizeof(arpreq)); + + SET_SA_FAMILY(arpreq.arp_pa, AF_INET); + ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = his_adr; + arpreq.arp_flags = ATF_PERM | ATF_PUBL; /* * Get the hardware address of an interface on the same subnet * as our local address. */ - if (!get_ether_addr(his_adr, &arpreq.arp_ha)) - { - syslog(LOG_ERR, "Cannot determine ethernet address for proxy ARP"); - return 0; - } - - SET_SA_FAMILY(arpreq.arp_pa, AF_INET); - ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = his_adr; - arpreq.arp_flags = ATF_PERM | ATF_PUBL; - - if (ioctl(sockfd, SIOCSARP, (caddr_t)&arpreq) < 0) - { - syslog(LOG_ERR, "ioctl(SIOCSARP): %m"); - return 0; - } + if (!get_ether_addr(his_adr, &arpreq.arp_ha, proxy_arp_dev, + sizeof(proxy_arp_dev))) { + error("Cannot determine ethernet address for proxy ARP"); + return 0; + } + strlcpy(arpreq.arp_dev, proxy_arp_dev, sizeof(arpreq.arp_dev)); + + if (ioctl(sock_fd, SIOCSARP, (caddr_t)&arpreq) < 0) { + if ( ! ok_error ( errno )) + error("ioctl(SIOCSARP): %m(%d)", errno); + return 0; + } + proxy_arp_addr = his_adr; + has_proxy_arp = 1; + } + return 1; - } +} -/* +/******************************************************************** + * * cifproxyarp - Delete the proxy ARP entry for the peer. */ int cifproxyarp (int unit, u_int32_t his_adr) - { +{ struct arpreq arpreq; - - memset (&arpreq, '\0', sizeof(arpreq)); - SET_SA_FAMILY(arpreq.arp_pa, AF_INET); - - ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = his_adr; - if (ioctl(sockfd, SIOCDARP, (caddr_t)&arpreq) < 0) - { - syslog(LOG_WARNING, "ioctl(SIOCDARP): %m"); - return 0; - } + + if (has_proxy_arp) { + has_proxy_arp = 0; + memset (&arpreq, '\0', sizeof(arpreq)); + SET_SA_FAMILY(arpreq.arp_pa, AF_INET); + ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = his_adr; + arpreq.arp_flags = ATF_PERM | ATF_PUBL; + strlcpy(arpreq.arp_dev, proxy_arp_dev, sizeof(arpreq.arp_dev)); + + if (ioctl(sock_fd, SIOCDARP, (caddr_t)&arpreq) < 0) { + if ( ! ok_error ( errno )) + warn("ioctl(SIOCDARP): %m(%d)", errno); + return 0; + } + } return 1; - } +} -/* +/******************************************************************** + * * get_ether_addr - get the hardware address of an interface on the * the same subnet as ipaddr. */ -int get_ether_addr (u_int32_t ipaddr, struct sockaddr *hwaddr) - { - struct ifreq *ifr, *ifend, *ifp; - int i; +static int get_ether_addr (u_int32_t ipaddr, + struct sockaddr *hwaddr, + char *name, int namelen) +{ + struct ifreq *ifr, *ifend; u_int32_t ina, mask; - struct sockaddr_dl *dla; struct ifreq ifreq; struct ifconf ifc; struct ifreq ifs[MAX_IFS]; ifc.ifc_len = sizeof(ifs); ifc.ifc_req = ifs; - if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) - { - syslog(LOG_ERR, "ioctl(SIOCGIFCONF): %m"); + if (ioctl(sock_fd, SIOCGIFCONF, &ifc) < 0) { + if ( ! ok_error ( errno )) + error("ioctl(SIOCGIFCONF): %m(%d)", errno); return 0; - } - MAINDEBUG ((LOG_DEBUG, "proxy arp: scanning %d interfaces for IP %s", + } + + SYSDEBUG ((LOG_DEBUG, "proxy arp: scanning %d interfaces for IP %s", ifc.ifc_len / sizeof(struct ifreq), ip_ntoa(ipaddr))); /* * Scan through looking for an interface with an Internet * address on the same subnet as `ipaddr'. */ ifend = ifs + (ifc.ifc_len / sizeof(struct ifreq)); - for (ifr = ifc.ifc_req; ifr < ifend; ifr++) - { - if (ifr->ifr_addr.sa_family == AF_INET) - { + for (ifr = ifc.ifc_req; ifr < ifend; ifr++) { + if (ifr->ifr_addr.sa_family == AF_INET) { ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr; - strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name)); - MAINDEBUG ((LOG_DEBUG, "proxy arp: examining interface %s", + strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name)); + SYSDEBUG ((LOG_DEBUG, "proxy arp: examining interface %s", ifreq.ifr_name)); /* * Check that the interface is up, and not point-to-point - * or loopback. + * nor loopback. */ - if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0) - { + if (ioctl(sock_fd, SIOCGIFFLAGS, &ifreq) < 0) continue; - } - if ((ifreq.ifr_flags & - (IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|IFF_LOOPBACK|IFF_NOARP)) - != (IFF_UP|IFF_BROADCAST)) - { + + if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0) continue; - } /* * Get its netmask and check that it's on the right subnet. */ - if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0) - { + if (ioctl(sock_fd, SIOCGIFNETMASK, &ifreq) < 0) continue; - } + mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr; - MAINDEBUG ((LOG_DEBUG, "proxy arp: interface addr %s mask %lx", + SYSDEBUG ((LOG_DEBUG, "proxy arp: interface addr %s mask %lx", ip_ntoa(ina), ntohl(mask))); + if (((ipaddr ^ ina) & mask) != 0) - { continue; - } break; - } - } + } + } if (ifr >= ifend) - { return 0; - } - syslog(LOG_INFO, "found interface %s for proxy arp", ifreq.ifr_name); + strlcpy(name, ifreq.ifr_name, namelen); + info("found interface %s for proxy arp", name); /* * Now get the hardware address. */ - if (ioctl (sockfd, SIOCGIFHWADDR, &ifreq) < 0) - { - syslog(LOG_ERR, "SIOCGIFHWADDR(%s): %m", ifreq.ifr_name); + memset (&ifreq.ifr_hwaddr, 0, sizeof (struct sockaddr)); + if (ioctl (sock_fd, SIOCGIFHWADDR, &ifreq) < 0) { + error("SIOCGIFHWADDR(%s): %m(%d)", ifreq.ifr_name, errno); return 0; - } + } - hwaddr->sa_family = ARPHRD_ETHER; - memcpy (&hwaddr->sa_data, &ifreq.ifr_hwaddr.sa_data, ETH_ALEN); + memcpy (hwaddr, + &ifreq.ifr_hwaddr, + sizeof (struct sockaddr)); - MAINDEBUG ((LOG_DEBUG, - "proxy arp: found hwaddr %02x:%02x:%02x:%02x:%02x:%02x", + SYSDEBUG ((LOG_DEBUG, + "proxy arp: found hwaddr %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x", (int) ((unsigned char *) &hwaddr->sa_data)[0], (int) ((unsigned char *) &hwaddr->sa_data)[1], (int) ((unsigned char *) &hwaddr->sa_data)[2], (int) ((unsigned char *) &hwaddr->sa_data)[3], (int) ((unsigned char *) &hwaddr->sa_data)[4], - (int) ((unsigned char *) &hwaddr->sa_data)[5])); + (int) ((unsigned char *) &hwaddr->sa_data)[5], + (int) ((unsigned char *) &hwaddr->sa_data)[6], + (int) ((unsigned char *) &hwaddr->sa_data)[7])); return 1; - } +} -/* +/******************************************************************** + * * 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 @@ -1155,9 +1477,8 @@ int get_ether_addr (u_int32_t ipaddr, struct sockaddr *hwaddr) * network as `addr'. If we find any, we OR in their netmask to the * user-specified netmask. */ -u_int32_t -GetMask(addr) - u_int32_t addr; + +u_int32_t GetMask (u_int32_t addr) { u_int32_t mask, nmask, ina; struct ifreq *ifr, *ifend, ifreq; @@ -1165,278 +1486,946 @@ GetMask(addr) 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; + nmask = IN_CLASSB_NET; else - nmask = IN_CLASSC_NET; + nmask = IN_CLASSC_NET; + /* class D nets are disallowed by bad_ip_adrs */ mask = netmask | htonl(nmask); - - /* - * Scan through the system's network interfaces. - */ +/* + * Scan through the system's network interfaces. + */ ifc.ifc_len = sizeof(ifs); ifc.ifc_req = ifs; - if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) { - syslog(LOG_WARNING, "ioctl(SIOCGIFCONF): %m"); + 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 = (struct ifreq *) - ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len)) { - /* - * Check the interface's internet address. - */ + for (ifr = ifc.ifc_req; ifr < ifend; ifr++) { +/* + * Check the interface's internet address. + */ if (ifr->ifr_addr.sa_family != AF_INET) continue; ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr; - if ((ntohl(ina) & nmask) != (addr & nmask)) + if (((ntohl(ina) ^ addr) & nmask) != 0) continue; - /* - * Check that the interface is up, and not point-to-point or loopback. - */ - strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name)); - if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0) +/* + * 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 & (IFF_UP|IFF_POINTOPOINT|IFF_LOOPBACK)) - != IFF_UP) + + if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0) continue; - /* - * Get its netmask and OR it into our mask. - */ - if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0) +/* + * Get its netmask and OR it into our mask. + */ + if (ioctl(sock_fd, SIOCGIFNETMASK, &ifreq) < 0) continue; mask |= ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr.s_addr; + break; } - return mask; } -/* +/******************************************************************** + * * Internal routine to decode the version.modification.patch level */ static void decode_version (char *buf, int *version, int *modification, int *patch) - { - +{ *version = (int) strtoul (buf, &buf, 10); *modification = 0; *patch = 0; - if (*buf == '.') - { + if (*buf == '.') { ++buf; *modification = (int) strtoul (buf, &buf, 10); - if (*buf == '.') - { + if (*buf == '.') { ++buf; *patch = (int) strtoul (buf, &buf, 10); - } - } + } + } - if (*buf != '\0') - { + if (*buf != '\0') { *version = *modification = *patch = 0; - } - } + } +} -/* +/******************************************************************** + * + * Procedure to determine if the PPP line discipline is registered. + */ + +static int +ppp_registered(void) +{ + int local_fd; + int mfd = -1; + int ret = 0; + char slave[16]; + + /* + * We used to open the serial device and set it to the ppp line + * discipline here, in order to create a ppp unit. But that is + * not a good idea - the user might have specified a device that + * they can't open (permission, or maybe it doesn't really exist). + * So we grab a pty master/slave pair and use that. + */ + if (!get_pty(&mfd, &local_fd, slave, 0)) { + no_ppp_msg = "Couldn't determine if PPP is supported (no free ptys)"; + return 0; + } + + /* + * Try to put the device into the PPP discipline. + */ + if (ioctl(local_fd, TIOCSETD, &ppp_disc) < 0) { + error("ioctl(TIOCSETD(PPP)): %m(%d)", errno); + } else + ret = 1; + + close(local_fd); + close(mfd); + return ret; +} + +/******************************************************************** + * * 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) - { +{ int s, ok; struct ifreq ifr; - int my_version, my_modification, my_patch; + int size; + int my_version, my_modification, my_patch; + + no_ppp_msg = + "This system lacks kernel support for PPP. This could be because\n" + "the PPP kernel module could not be loaded, or because PPP was not\n" + "included in the kernel configuration. If PPP was included as a\n" + "module, try `/sbin/modprobe -v ppp'. If that fails, check that\n" + "ppp.o exists in /lib/modules/`uname -r`/net.\n" + "See README.linux file in the ppp distribution for more details.\n"; + /* * Open a socket for doing the ioctl operations. */ s = socket(AF_INET, SOCK_DGRAM, 0); if (s < 0) - { return 0; - } - strncpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name)); + strlcpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name)); ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0; +/* + * If the device did not exist then attempt to create one by putting the + * current tty into the PPP discipline. If this works then obtain the + * flags for the device again. + */ + if (!ok) { + if (ppp_registered()) { + strlcpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name)); + ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0; + } + } /* * Ensure that the hardware address is for PPP and not something else */ - if (ok != 0) - { + if (ok) ok = ioctl (s, SIOCGIFHWADDR, (caddr_t) &ifr) >= 0; - } - if (ok != 0 && ifr.ifr_hwaddr.sa_family != ARPHRD_PPP) - { + if (ok && ((ifr.ifr_hwaddr.sa_family & ~0xFF) != ARPHRD_PPP)) ok = 0; - } + /* * This is the PPP device. Validate the version of the driver at this * point to ensure that this program will work with the driver. */ - if (ok != 0) - { - char abBuffer [1024]; - int size; + if (ok) { + char abBuffer [1024]; ifr.ifr_data = abBuffer; size = ioctl (s, SIOCGPPPVER, (caddr_t) &ifr); - ok = size >= 0; - - if (ok != 0) - { - decode_version (abBuffer, - &driver_version, - &driver_modification, - &driver_patch); - } - } - - if (ok == 0) - { - driver_version = - driver_modification = - driver_patch = 0; - } + if (size < 0) { + error("Couldn't read driver version: %m"); + ok = 0; + no_ppp_msg = "Sorry, couldn't verify kernel driver version\n"; + + } else { + decode_version(abBuffer, + &driver_version, + &driver_modification, + &driver_patch); /* * Validate the version of the driver against the version that we used. */ - decode_version (PPP_VERSION, - &my_version, - &my_modification, - &my_patch); - - /* The version numbers must match */ - if (driver_version != my_version) - { - ok = 0; - } + decode_version(VERSION, + &my_version, + &my_modification, + &my_patch); + + /* The version numbers must match */ + if (driver_version != my_version) + ok = 0; - /* The modification levels must be legal */ - if (driver_modification < my_modification) - { - ok = 0; - } + /* The modification levels must be legal */ + if (driver_modification < 3) { + if (driver_modification >= 2) { + /* we can cope with 2.2.0 and above */ + driver_is_old = 1; + } else { + ok = 0; + } + } - if (ok == 0) - { - fprintf(stderr, "Sorry - PPP driver version %d.%d.%d is out of date\n", - driver_version, driver_modification, driver_patch); - } - - close(s); + close (s); + if (!ok) { + slprintf(route_buffer, sizeof(route_buffer), + "Sorry - PPP driver version %d.%d.%d is out of date\n", + driver_version, driver_modification, driver_patch); + + no_ppp_msg = route_buffer; + } + } + } return ok; - } +} -int logwtmp (char *line, char *name, char *host) - { - struct utmp ut; - int mode; -/* - * Control the 'mesg' function based upon the state of the logon - * operation. - */ - mode = (*name != '\0') ? 0600 : 0622; - if (chmod (devnam, mode) < 0) - { - syslog (LOG_ERR, "chmod(\"%s\", 0%o): %m", devnam, mode); - } +/******************************************************************** + * + * Update the wtmp file with the appropriate user name and tty device. + */ + +void logwtmp (const char *line, const char *name, const char *host) +{ + int wtmp; + struct utmp ut, *utp; + pid_t mypid = getpid(); /* * Update the signon database for users. + * Christoph Lameter: Copied from poeigl-1.36 Jan 3, 1996 */ - memset (&ut, 0, sizeof (ut)); - (void)strncpy(ut.ut_line, line, sizeof(ut.ut_line)); - (void)strncpy(ut.ut_name, name, sizeof(ut.ut_name)); - (void)strncpy(ut.ut_host, host, sizeof(ut.ut_host)); - (void)time(&ut.ut_time); + utmpname(_PATH_UTMP); + setutent(); + while ((utp = getutent()) && (utp->ut_pid != mypid)) + /* nothing */; + + /* Is this call really necessary? There is another one after the 'put' */ + endutent(); + + if (utp) + memcpy(&ut, utp, sizeof(ut)); + else + /* some gettys/telnetds don't initialize utmp... */ + memset(&ut, 0, sizeof(ut)); + + if (ut.ut_id[0] == 0) + strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id)); - pututline (&ut); /* Write the line to the proper place */ - endutent(); /* Indicate operation is complete */ - } + strncpy(ut.ut_user, name, sizeof(ut.ut_user)); + strncpy(ut.ut_line, line, sizeof(ut.ut_line)); + + time(&ut.ut_time); + ut.ut_type = USER_PROCESS; + ut.ut_pid = mypid; + + /* Insert the host name if one is supplied */ + if (*host) + strncpy (ut.ut_host, host, sizeof(ut.ut_host)); + + /* Insert the IP address of the remote system if IP is enabled */ + if (ipcp_protent.enabled_flag && ipcp_hisoptions[0].neg_addr) + memcpy(&ut.ut_addr, (char *) &ipcp_hisoptions[0].hisaddr, + sizeof(ut.ut_addr)); + + /* CL: Makes sure that the logout works */ + if (*host == 0 && *name==0) + ut.ut_host[0]=0; + + pututline(&ut); + endutent(); /* + * Update the wtmp file. + */ + wtmp = open(_PATH_WTMP, O_APPEND|O_WRONLY); + if (wtmp >= 0) { + flock(wtmp, LOCK_EX); + + /* we really should check for error on the write for a full disk! */ + write (wtmp, (char *)&ut, sizeof(ut)); + close (wtmp); + + flock(wtmp, LOCK_UN); + } +} + +#if 0 +/******************************************************************** * Code for locking/unlocking the serial device. * This code is derived from chat.c. */ +#ifndef LOCK_PREFIX #define LOCK_PREFIX "/var/lock/LCK.." +#endif + +static char *lock_file; /* * lock - create a lock file for the named device */ -int -lock(dev) - char *dev; + +int lock (char *dev) { +#ifdef LOCKLIB + int result; + lock_file = strdup(dev); + if (lock_file == NULL) + novm("lock file name"); + result = mklock (dev, (void *) 0); + + if (result > 0) { + notice("Device %s is locked by pid %d", dev, result); + free (lock_file); + lock_file = NULL; + result = -1; + } + else { + if (result < 0) { + error("Can't create lock file %s", lock_file); + free (lock_file); + lock_file = NULL; + result = -1; + } + } + return (result); +#else char hdb_lock_buffer[12]; - int fd, pid, n; + int fd, n; + int pid = getpid(); char *p; + size_t l; + + p = strrchr(dev, '/'); + if (p != NULL) + dev = ++p; - if ((p = strrchr(dev, '/')) != NULL) - dev = p + 1; - lock_file = malloc(strlen(LOCK_PREFIX) + strlen(dev) + 1); + l = strlen(LOCK_PREFIX) + strlen(dev) + 1; + lock_file = malloc(l); if (lock_file == NULL) novm("lock file name"); - strcat(strcpy(lock_file, LOCK_PREFIX), dev); - while ((fd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644)) < 0) { - if (errno == EEXIST - && (fd = open(lock_file, O_RDONLY, 0)) >= 0) { + slprintf(lock_file, l, "%s%s", LOCK_PREFIX, dev); +/* + * Attempt to create the lock file at this point. + */ + while (1) { + fd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644); + if (fd >= 0) { + pid = getpid(); +#ifndef PID_BINARY + slprintf(hdb_lock_buffer, sizeof(hdb_lock_buffer), "%010d\n", pid); + write (fd, hdb_lock_buffer, 11); +#else + write(fd, &pid, sizeof (pid)); +#endif + close(fd); + return 0; + } +/* + * If the file exists then check to see if the pid is stale + */ + if (errno == EEXIST) { + fd = open(lock_file, O_RDONLY, 0); + if (fd < 0) { + if (errno == ENOENT) /* This is just a timing problem. */ + continue; + break; + } + /* Read the lock file to find out who has the device locked */ - n = read(fd, hdb_lock_buffer, 11); + n = read (fd, hdb_lock_buffer, 11); + close (fd); + if (n < 0) { + error("Can't read pid from lock file %s", lock_file); + break; + } + + /* See the process still exists. */ if (n > 0) { - hdb_lock_buffer[n] = 0; +#ifndef PID_BINARY + hdb_lock_buffer[n] = '\0'; sscanf (hdb_lock_buffer, " %d", &pid); +#else + pid = ((int *) hdb_lock_buffer)[0]; +#endif + if (pid == 0 || pid == getpid() + || (kill(pid, 0) == -1 && errno == ESRCH)) + n = 0; } - if (n <= 0) { - syslog(LOG_ERR, "Can't read pid from lock file %s", lock_file); - close(fd); - } else { - if (kill(pid, 0) == -1 && errno == ESRCH) { - /* pid no longer exists - remove the lock file */ - if (unlink(lock_file) == 0) { - close(fd); - syslog(LOG_NOTICE, "Removed stale lock on %s (pid %d)", - dev, pid); - continue; - } else - syslog(LOG_WARNING, "Couldn't remove stale lock on %s", - dev); - } else - syslog(LOG_NOTICE, "Device %s is locked by pid %d", - dev, pid); + + /* If the process does not exist then try to remove the lock */ + if (n == 0 && unlink (lock_file) == 0) { + notice("Removed stale lock on %s (pid %d)", + dev, pid); + continue; } - close(fd); - } else - syslog(LOG_ERR, "Can't create lock file %s: %m", lock_file); - free(lock_file); - lock_file = NULL; - return -1; - } - sprintf(hdb_lock_buffer, "%010d\n", getpid()); - write(fd, hdb_lock_buffer, 11); + notice("Device %s is locked by pid %d", dev, pid); + break; + } - close(fd); - return 0; + error("Can't create lock file %s: %m(%d)", lock_file, errno); + break; + } + + free(lock_file); + lock_file = NULL; + return -1; +#endif } -/* + +/******************************************************************** + * * unlock - remove our lockfile */ -unlock() + +void unlock(void) { if (lock_file) { +#ifdef LOCKLIB + (void) rmlock (lock_file, (void *) 0); +#else unlink(lock_file); +#endif free(lock_file); lock_file = NULL; } } +#endif + +/******************************************************************** + * + * sifvjcomp - config tcp header compression + */ + +int sifvjcomp (int u, int vjcomp, int cidcomp, int maxcid) +{ + u_int x = get_flags(); + + if (vjcomp) { + if (ioctl (ppp_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 (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 = 1; + return 1; +} + +/******************************************************************** + * + * sifdown - Config the interface down and disable IP. + */ + +int sifdown (int u) +{ + struct ifreq ifr; + + if_is_up = 0; + + 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 + */ + ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_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 + */ + ((struct sockaddr_in *) &ifr.ifr_dstaddr)->sin_addr.s_addr = 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) { + ((struct sockaddr_in *) &ifr.ifr_netmask)->sin_addr.s_addr = 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; + + ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = 0L; + ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = his_adr; + rt.rt_flags = RTF_UP | RTF_HOST; + + if (kernel_version > KVERSION(2,1,0)) { + SET_SA_FAMILY (rt.rt_genmask, AF_INET); + ((struct sockaddr_in *) &rt.rt_genmask)->sin_addr.s_addr = -1L; + } + + if (ioctl(sock_fd, SIOCADDRT, &rt) < 0) { + if (! ok_error (errno)) + error("ioctl(SIOCADDRT) device route: %m(%d)", errno); + return (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 rtentry rt; + + if (kernel_version < KVERSION(2,1,16)) { +/* + * Delete the route through the device + */ + 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; + + ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = 0; + ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = his_adr; + rt.rt_flags = RTF_UP | RTF_HOST; + + if (kernel_version > KVERSION(2,1,0)) { + SET_SA_FAMILY (rt.rt_genmask, AF_INET); + ((struct sockaddr_in *) &rt.rt_genmask)->sin_addr.s_addr = -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); + } + } + return 1; +} + +/* + * get_pty - get a pty master/slave pair and chown the slave side + * to the uid given. Assumes slave_name points to >= 12 bytes of space. + */ +int +get_pty(master_fdp, slave_fdp, slave_name, uid) + int *master_fdp; + int *slave_fdp; + char *slave_name; + int uid; +{ + int i, mfd, sfd; + char pty_name[12]; + struct termios tios; + + sfd = -1; + for (i = 0; i < 64; ++i) { + slprintf(pty_name, sizeof(pty_name), "/dev/pty%c%x", + 'p' + i / 16, i % 16); + mfd = open(pty_name, O_RDWR, 0); + if (mfd >= 0) { + pty_name[5] = 't'; + sfd = open(pty_name, O_RDWR | O_NOCTTY, 0); + if (sfd >= 0) + break; + close(mfd); + } + } + if (sfd < 0) + return 0; + + strlcpy(slave_name, pty_name, 12); + *master_fdp = mfd; + *slave_fdp = sfd; + fchown(sfd, uid, -1); + fchmod(sfd, S_IRUSR | S_IWUSR); + if (tcgetattr(sfd, &tios) == 0) { + tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB); + tios.c_cflag |= CS8 | CREAD; + tios.c_iflag = IGNPAR | CLOCAL; + tios.c_oflag = 0; + tios.c_lflag = 0; + if (tcsetattr(sfd, TCSAFLUSH, &tios) < 0) + warn("couldn't set attributes on pty: %m"); + } else + warn("couldn't get attributes on pty: %m"); + + return 1; +} + +/******************************************************************** + * + * 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; + + 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) +{ + 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_fd, PPPIOCSNPMODE, (caddr_t) &npi) < 0) { + if (! ok_error (errno)) { + error("ioctl(PPPIOCSNPMODE, %d, %d): %m (%d)", + proto, mode, errno); + error("ppp_fd=%d slave_fd=%d\n", ppp_fd, slave_fd); + } + return 0; + } + return 1; +} + + +/******************************************************************** + * + * sipxfaddr - Config the interface IPX networknumber + */ + +int sipxfaddr (int unit, unsigned long int network, unsigned char * node ) +{ + int result = 1; + +#ifdef IPX_CHANGE + int skfd; + struct ifreq ifr; + struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr; + + skfd = socket (AF_IPX, SOCK_DGRAM, 0); + if (skfd < 0) { + if (! ok_error (errno)) + dbglog("socket(AF_IPX): %m (%d)", errno); + result = 0; + } + else { + memset (&ifr, '\0', sizeof (ifr)); + strlcpy (ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); + + memcpy (sipx->sipx_node, node, IPX_NODE_LEN); + sipx->sipx_family = AF_IPX; + sipx->sipx_port = 0; + sipx->sipx_network = htonl (network); + sipx->sipx_type = IPX_FRAME_ETHERII; + sipx->sipx_action = IPX_CRTITF; +/* + * Set the IPX device + */ + if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0) { + result = 0; + if (errno != EEXIST) { + if (! ok_error (errno)) + dbglog("ioctl(SIOCSIFADDR, CRTITF): %m (%d)", errno); + } + else { + warn("ioctl(SIOCSIFADDR, CRTITF): Address already exists"); + } + } + close (skfd); + } +#endif + return result; +} + +/******************************************************************** + * + * cipxfaddr - Clear the information for the IPX network. The IPX routes + * are removed and the device is no longer able to pass IPX + * frames. + */ + +int cipxfaddr (int unit) +{ + int result = 1; + +#ifdef IPX_CHANGE + int skfd; + struct ifreq ifr; + struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr; + + skfd = socket (AF_IPX, SOCK_DGRAM, 0); + if (skfd < 0) { + if (! ok_error (errno)) + dbglog("socket(AF_IPX): %m (%d)", errno); + result = 0; + } + else { + memset (&ifr, '\0', sizeof (ifr)); + strlcpy (ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); + + sipx->sipx_type = IPX_FRAME_ETHERII; + sipx->sipx_action = IPX_DLTITF; + sipx->sipx_family = AF_IPX; +/* + * Set the IPX device + */ + if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0) { + if (! ok_error (errno)) + info("ioctl(SIOCSIFADDR, IPX_DLTITF): %m (%d)", errno); + result = 0; + } + close (skfd); + } +#endif + return result; +} + +#if 0 +/* + * daemon - Detach us from controlling terminal session. + */ +int +daemon(nochdir, noclose) + int nochdir, noclose; +{ + int pid; + + if ((pid = fork()) < 0) + return -1; + if (pid != 0) + exit(0); /* parent dies */ + setsid(); + if (!nochdir) + chdir("/"); + if (!noclose) { + fclose(stdin); /* don't need stdin, stdout, stderr */ + fclose(stdout); + fclose(stderr); + } + return 0; +} +#endif + +/* + * 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; +} + +/******************************************************************** + * + * sys_check_options - check the options that the user specified + */ + +int +sys_check_options(void) +{ +#ifdef IPX_CHANGE + struct stat stat_buf; +/* + * Disable the IPX protocol if the support is not present in the kernel. + * If we disable it then ensure that IP support is enabled. + */ + while (ipxcp_protent.enabled_flag) { + if (path_to_procfs()) { + strlcat (route_buffer, "/net/ipx_interface", sizeof(route_buffer)); + if (lstat (route_buffer, &stat_buf) >= 0) + break; + } + error("IPX support is not present in the kernel\n"); + ipxcp_protent.enabled_flag = 0; + ipcp_protent.enabled_flag = 1; + break; + } +#endif + if (demand && driver_is_old) { + option_error("demand dialling is not supported by kernel driver " + "version %d.%d.%d", driver_version, driver_modification, + driver_patch); + return 0; + } + return 1; +}