2 * sys-linux.c - System-dependent procedures for setting up
3 * PPP interfaces on Linux systems
5 * Copyright (c) 1989 Carnegie Mellon University.
8 * Redistribution and use in source and binary forms are permitted
9 * provided that the above copyright notice and this paragraph are
10 * duplicated in all such forms and that any documentation,
11 * advertising materials, and other materials related to such
12 * distribution and use acknowledge that the software was developed
13 * by Carnegie Mellon University. The name of the
14 * University may not be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
18 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
25 #include <sys/ioctl.h>
26 #include <sys/types.h>
27 #include <sys/socket.h>
29 #include <sys/errno.h>
44 #include <net/ppp_defs.h>
45 #include <net/if_arp.h>
46 #include <net/if_ppp.h>
47 #include <net/route.h>
48 #include <linux/if_ether.h>
49 #include <netinet/in.h>
55 static int initdisc = -1; /* Initial TTY discipline */
56 static int initfdflags = -1; /* Initial file descriptor flags for fd */
57 static int prev_kdebugflag = 0;
58 static int has_default_route = 0;
59 static int has_proxy_arp = 0;
60 static int driver_version = 0;
61 static int driver_modification = 0;
62 static int driver_patch = 0;
63 static int restore_term = 0; /* 1 => we've munged the terminal */
64 static struct termios inittermios; /* Initial TTY termios */
66 static int sockfd; /* socket for doing interface ioctls */
68 static int if_is_up; /* Interface has been marked up */
69 static u_int32_t default_route_gateway; /* Gateway for default route added */
70 static u_int32_t proxy_arp_addr; /* Addr for proxy arp entry added */
72 static char *lock_file;
76 #define FLAGS_GOOD (IFF_UP | IFF_BROADCAST)
77 #define FLAGS_MASK (IFF_UP | IFF_BROADCAST | \
78 IFF_POINTOPOINT | IFF_LOOPBACK | IFF_NOARP)
80 /* Prototypes for procedures local to this file. */
81 static int get_flags (void);
82 static void set_flags (int flags);
83 static int translate_speed (int bps);
84 static int baud_rate_of (int speed);
85 static char *path_to_route (void);
86 static void close_route_table (void);
87 static int open_route_table (void);
88 static int read_route_table (struct rtentry *rt);
89 static int defaultroute_exists (void);
90 static int get_ether_addr (u_int32_t ipaddr, struct sockaddr *hwaddr);
91 static void decode_version (char *buf, int *version, int *mod, int *patch);
95 * SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
99 #define SET_SA_FAMILY(addr, family) \
100 memset ((char *) &(addr), '\0', sizeof(addr)); \
101 addr.sa_family = (family);
104 * Determine if the PPP connection should still be present.
108 #define still_ppp() (hungup == 0)
111 * Functions to read and set the flags value in the device driver
114 static int get_flags (void)
118 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &flags) < 0)
120 syslog(LOG_ERR, "ioctl(PPPIOCGFLAGS): %m");
124 MAINDEBUG ((LOG_DEBUG, "get flags = %x\n", flags));
128 static void set_flags (int flags)
130 MAINDEBUG ((LOG_DEBUG, "set flags = %x\n", flags));
132 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &flags) < 0)
134 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS, %x): %m", flags);
140 * sys_init - System-dependent initialization.
145 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
146 setlogmask(LOG_UPTO(LOG_INFO));
149 setlogmask(LOG_UPTO(LOG_DEBUG));
152 /* Get an internet socket for doing socket ioctls. */
153 sockfd = socket(AF_INET, SOCK_DGRAM, 0);
156 syslog(LOG_ERR, "Couldn't create IP socket: %m");
162 * sys_cleanup - restore any system state we modified before exiting:
163 * mark the interface down, delete default route and/or proxy arp entry.
164 * This should call die() because it's called from die().
172 /* XXX maybe we need to delete the route through the interface */
173 if (has_default_route)
174 cifdefaultroute(0, default_route_gateway);
176 cifproxyarp(0, proxy_arp_addr);
180 * note_debug_level - note a change in the debug level.
183 void note_debug_level (void)
187 MAINDEBUG ((LOG_INFO, "Debug turned ON, Level %d", debug));
188 setlogmask(LOG_UPTO(LOG_DEBUG));
192 setlogmask(LOG_UPTO(LOG_WARNING));
197 * set_kdebugflag - Define the debugging level for the kernel
200 int set_kdebugflag (int requested_level)
202 if (ioctl(fd, PPPIOCGDEBUG, &prev_kdebugflag) < 0)
204 syslog(LOG_ERR, "ioctl(PPPIOCGDEBUG): %m");
208 if (prev_kdebugflag != requested_level)
210 if (ioctl(fd, PPPIOCSDEBUG, &requested_level) < 0)
212 syslog (LOG_ERR, "ioctl(PPPIOCSDEBUG): %m");
215 MAINDEBUG ((LOG_INFO, "set kernel debugging level to %d",
222 * establish_ppp - Turn the serial port into a ppp interface.
225 void establish_ppp (void)
230 if (ioctl(fd, TIOCEXCL, 0) < 0)
232 syslog (LOG_WARNING, "ioctl(TIOCEXCL): %m");
235 if (ioctl(fd, TIOCGETD, &initdisc) < 0)
237 syslog(LOG_ERR, "ioctl(TIOCGETD): %m");
241 if (ioctl(fd, TIOCSETD, &pppdisc) < 0)
243 syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
247 if (ioctl(fd, PPPIOCGUNIT, &ifunit) < 0)
249 syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m");
253 set_kdebugflag (kdebugflag);
255 set_flags (get_flags() & ~(SC_RCV_B7_0 | SC_RCV_B7_1 |
256 SC_RCV_EVNP | SC_RCV_ODDP));
258 MAINDEBUG ((LOG_NOTICE, "Using version %d.%d.%d of PPP driver",
259 driver_version, driver_modification, driver_patch));
262 * Set device for non-blocking reads.
264 if ((initfdflags = fcntl(fd, F_GETFL)) == -1
265 || fcntl(fd, F_SETFL, initfdflags | O_NONBLOCK) == -1) {
267 syslog(LOG_WARNING, "Couldn't set device to non-blocking mode: %m");
272 * disestablish_ppp - Restore the serial port to normal operation.
273 * This shouldn't call die() because it's called from die().
276 void disestablish_ppp(void)
281 /* Reset non-blocking mode on the file descriptor. */
282 if (initfdflags != -1 && fcntl(fd, F_SETFL, initfdflags) < 0)
283 syslog(LOG_WARNING, "Couldn't restore device fd flags: %m");
287 * Fetch the flags for the device and generate appropriate error
290 if (still_ppp() && initdisc >= 0)
292 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) == 0)
295 switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP))
297 case SC_RCV_B7_0 | SC_RCV_B7_1 | SC_RCV_EVNP | SC_RCV_ODDP:
298 s = "nothing was received";
302 case SC_RCV_B7_0 | SC_RCV_EVNP:
303 case SC_RCV_B7_0 | SC_RCV_ODDP:
304 case SC_RCV_B7_0 | SC_RCV_ODDP | SC_RCV_EVNP:
305 s = "all had bit 7 set to 1";
309 case SC_RCV_B7_1 | SC_RCV_EVNP:
310 case SC_RCV_B7_1 | SC_RCV_ODDP:
311 case SC_RCV_B7_1 | SC_RCV_ODDP | SC_RCV_EVNP:
312 s = "all had bit 7 set to 0";
316 s = "all had odd parity";
320 s = "all had even parity";
326 syslog(LOG_WARNING, "Receive serial link is not"
328 syslog(LOG_WARNING, "Problem: %s", s);
332 set_kdebugflag (prev_kdebugflag);
334 if (ioctl(fd, TIOCSETD, &initdisc) < 0)
336 syslog(LOG_WARNING, "ioctl(TIOCSETD): %m");
339 if (ioctl(fd, TIOCNXCL, 0) < 0)
341 syslog (LOG_WARNING, "ioctl(TIOCNXCL): %m");
348 * List of valid speeds.
352 int speed_int, speed_val;
424 * Translate from bits/second to a speed_t.
427 static int translate_speed (int bps)
429 struct speed *speedp;
433 for (speedp = speeds; speedp->speed_int; speedp++)
435 if (bps == speedp->speed_int)
437 return speedp->speed_val;
440 syslog(LOG_WARNING, "speed %d not supported", bps);
446 * Translate from a speed_t to bits/second.
449 static int baud_rate_of (int speed)
451 struct speed *speedp;
455 for (speedp = speeds; speedp->speed_int; speedp++)
457 if (speed == speedp->speed_val)
459 return speedp->speed_int;
467 * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
468 * at the requested speed, etc. If `local' is true, set CLOCAL
469 * regardless of whether the modem option was specified.
472 void set_up_tty (int fd, int local)
477 if (tcgetattr(fd, &tios) < 0)
479 syslog(LOG_ERR, "tcgetattr: %m");
488 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
489 tios.c_cflag |= CS8 | CREAD | HUPCL;
491 tios.c_iflag = IGNBRK | IGNPAR;
495 tios.c_cc[VTIME] = 0;
499 tios.c_cflag ^= (CLOCAL | HUPCL);
505 tios.c_cflag |= CRTSCTS;
509 tios.c_iflag |= IXON | IXOFF;
510 tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */
511 tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */
515 tios.c_cflag &= ~CRTSCTS;
522 speed = translate_speed(inspeed);
525 cfsetospeed (&tios, speed);
526 cfsetispeed (&tios, speed);
529 * We can't proceed if the serial port speed is B0,
530 * since that implies that the serial port is disabled.
534 speed = cfgetospeed(&tios);
537 syslog(LOG_ERR, "Baud rate for %s is 0; need explicit baud rate",
543 if (tcsetattr(fd, TCSAFLUSH, &tios) < 0)
545 syslog(LOG_ERR, "tcsetattr: %m");
549 baud_rate = baud_rate_of(speed);
554 * setdtr - control the DTR line on the serial port.
555 * This is called from die(), so it shouldn't call die().
558 void setdtr (int fd, int on)
560 int modembits = TIOCM_DTR;
562 ioctl(fd, (on ? TIOCMBIS : TIOCMBIC), &modembits);
566 * restore_tty - restore the terminal to the saved settings.
569 void restore_tty (void)
575 * Turn off echoing, because otherwise we can get into
576 * a loop with the tty and the modem echoing to each other.
577 * We presume we are the sole user of this tty device, so
578 * when we close it, it will revert to its defaults anyway.
582 inittermios.c_lflag &= ~(ECHO | ECHONL);
585 if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0)
589 syslog(LOG_WARNING, "tcsetattr: %m");
596 * output - Output PPP packet.
599 void output (int unit, unsigned char *p, int len)
603 log_packet(p, len, "sent ");
606 if (write(fd, p, len) < 0)
608 if (errno == EWOULDBLOCK || errno == ENOBUFS
609 || errno == ENXIO || errno == EIO)
611 syslog(LOG_WARNING, "write: warning: %m");
615 syslog(LOG_ERR, "write: %m");
622 * wait_input - wait until there is data available on fd,
623 * for the length of time specified by *timo (indefinite
627 void wait_input (struct timeval *timo)
635 n = select(fd+1, &ready, NULL, &ready, timo);
636 if (n < 0 && errno != EINTR)
638 syslog(LOG_ERR, "select: %m");
644 * read_packet - get a PPP packet from the serial device.
647 int read_packet (unsigned char *buf)
651 len = read(fd, buf, PPP_MTU + PPP_HDRLEN);
654 if (errno == EWOULDBLOCK)
658 syslog(LOG_ERR, "read(fd): %m");
665 * ppp_send_config - configure the transmit characteristics of
669 void ppp_send_config (int unit,int mtu,u_int32_t asyncmap,int pcomp,int accomp)
674 MAINDEBUG ((LOG_DEBUG, "send_config: mtu = %d\n", mtu));
676 * Ensure that the link is still up.
681 * Set the MTU and other parameters for the ppp device
683 memset (&ifr, '\0', sizeof (ifr));
684 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
687 if (ioctl(sockfd, SIOCSIFMTU, (caddr_t) &ifr) < 0)
689 syslog(LOG_ERR, "ioctl(SIOCSIFMTU): %m");
693 MAINDEBUG ((LOG_DEBUG, "send_config: asyncmap = %lx\n", asyncmap));
694 if (ioctl(fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0)
696 syslog(LOG_ERR, "ioctl(PPPIOCSASYNCMAP): %m");
701 x = pcomp ? x | SC_COMP_PROT : x & ~SC_COMP_PROT;
702 x = accomp ? x | SC_COMP_AC : x & ~SC_COMP_AC;
708 * ppp_set_xaccm - set the extended transmit ACCM for the interface.
711 void ppp_set_xaccm (int unit, ext_accm accm)
713 MAINDEBUG ((LOG_DEBUG, "set_xaccm: %08lx %08lx %08lx %08lx\n",
714 accm[0], accm[1], accm[2], accm[3]));
716 if (ioctl(fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY)
718 syslog(LOG_WARNING, "ioctl(set extended ACCM): %m");
723 * ppp_recv_config - configure the receive-side characteristics of
727 void ppp_recv_config (int unit,int mru,u_int32_t asyncmap,int pcomp,int accomp)
731 MAINDEBUG ((LOG_DEBUG, "recv_config: mru = %d\n", mru));
733 * If we were called because the link has gone down then there is nothing
734 * which may be done. Just return without incident.
741 * Set the receiver parameters
743 if (ioctl(fd, PPPIOCSMRU, (caddr_t) &mru) < 0)
745 syslog(LOG_ERR, "ioctl(PPPIOCSMRU): %m");
748 MAINDEBUG ((LOG_DEBUG, "recv_config: asyncmap = %lx\n", asyncmap));
749 if (ioctl(fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0)
751 syslog(LOG_ERR, "ioctl(PPPIOCSRASYNCMAP): %m");
756 x = !accomp? x | SC_REJ_COMP_AC: x &~ SC_REJ_COMP_AC;
761 * ccp_test - ask kernel whether a given compression method
762 * is acceptable for use.
765 int ccp_test (int unit, u_char *opt_ptr, int opt_len, int for_transmit)
767 struct ppp_option_data data;
769 memset (&data, '\0', sizeof (data));
771 data.length = opt_len;
772 data.transmit = for_transmit;
774 if (ioctl(fd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0)
779 return (errno == ENOBUFS)? 0: -1;
783 * ccp_flags_set - inform kernel about the current state of CCP.
786 void ccp_flags_set (int unit, int isopen, int isup)
791 x = isopen? x | SC_CCP_OPEN : x &~ SC_CCP_OPEN;
792 x = isup? x | SC_CCP_UP : x &~ SC_CCP_UP;
798 * ccp_fatal_error - returns 1 if decompression was disabled as a
799 * result of an error detected after decompression of a packet,
800 * 0 otherwise. This is necessary because of patent nonsense.
803 int ccp_fatal_error (int unit)
807 return x & SC_DC_FERROR;
811 * sifvjcomp - config tcp header compression
814 int sifvjcomp (int u, int vjcomp, int cidcomp, int maxcid)
816 u_int x = get_flags();
820 if (ioctl (fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0)
822 syslog (LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
827 x = vjcomp ? x | SC_COMP_TCP : x &~ SC_COMP_TCP;
828 x = cidcomp ? x & ~SC_NO_TCP_CCID : x | SC_NO_TCP_CCID;
835 * sifup - Config the interface up and enable IP packets to pass.
842 memset (&ifr, '\0', sizeof (ifr));
843 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
844 if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0)
846 syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
850 ifr.ifr_flags |= (IFF_UP | IFF_POINTOPOINT);
851 if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0)
853 syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
861 * sifdown - Config the interface down and disable IP.
868 memset (&ifr, '\0', sizeof (ifr));
869 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
870 if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0)
872 syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
876 ifr.ifr_flags &= ~IFF_UP;
877 ifr.ifr_flags |= IFF_POINTOPOINT;
878 if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0)
880 syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
888 * sifaddr - Config the interface IP addresses and netmask.
891 int sifaddr (int unit, int our_adr, int his_adr, int net_mask)
896 memset (&ifr, '\0', sizeof (ifr));
897 memset (&rt, '\0', sizeof (rt));
899 SET_SA_FAMILY (ifr.ifr_addr, AF_INET);
900 SET_SA_FAMILY (ifr.ifr_dstaddr, AF_INET);
901 SET_SA_FAMILY (ifr.ifr_netmask, AF_INET);
903 strncpy (ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
907 ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = our_adr;
908 if (ioctl(sockfd, SIOCSIFADDR, (caddr_t) &ifr) < 0)
912 syslog (LOG_ERR, "ioctl(SIOCAIFADDR): %m");
916 syslog (LOG_WARNING, "ioctl(SIOCAIFADDR): Address already exists");
921 * Set the gateway address
923 ((struct sockaddr_in *) &ifr.ifr_dstaddr)->sin_addr.s_addr = his_adr;
924 if (ioctl(sockfd, SIOCSIFDSTADDR, (caddr_t) &ifr) < 0)
926 syslog (LOG_ERR, "ioctl(SIOCSIFDSTADDR): %m");
934 ((struct sockaddr_in *) &ifr.ifr_netmask)->sin_addr.s_addr = net_mask;
935 if (ioctl(sockfd, SIOCSIFNETMASK, (caddr_t) &ifr) < 0)
937 syslog (LOG_ERR, "ioctl(SIOCSIFNETMASK): %m");
942 * Add the device route
944 SET_SA_FAMILY (rt.rt_dst, AF_INET);
945 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
946 rt.rt_dev = ifname; /* MJC */
948 ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = 0L;
949 ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = his_adr;
950 rt.rt_flags = RTF_UP | RTF_HOST;
952 if (ioctl(sockfd, SIOCADDRT, &rt) < 0)
954 syslog (LOG_ERR, "ioctl(SIOCADDRT) device route: %m");
961 * cifaddr - Clear the interface IP addresses, and delete routes
962 * through the interface if possible.
965 int cifaddr (int unit, int our_adr, int his_adr)
969 * Delete the route through the device
971 memset (&rt, '\0', sizeof (rt));
973 SET_SA_FAMILY (rt.rt_dst, AF_INET);
974 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
975 rt.rt_dev = ifname; /* MJC */
977 ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = 0;
978 ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = his_adr;
979 rt.rt_flags = RTF_UP | RTF_HOST;
981 if (ioctl(sockfd, SIOCDELRT, &rt) < 0 && errno != ESRCH)
985 syslog (LOG_ERR, "ioctl(SIOCDELRT) device route: %m");
993 * path_to_route - determine the path to the proc file system data
996 FILE *route_fd = (FILE *) 0;
997 static char route_buffer [512];
999 static char *path_to_route (void);
1000 static int open_route_table (void);
1001 static void close_route_table (void);
1002 static int read_route_table (struct rtentry *rt);
1003 static int defaultroute_exists (void);
1006 * path_to_route - find the path to the route tables in the proc file system
1009 static char *path_to_route (void)
1011 struct mntent *mntent;
1014 fp = fopen (MOUNTED, "r");
1017 mntent = getmntent (fp);
1018 while (mntent != (struct mntent *) 0)
1020 if (strcmp (mntent->mnt_type, MNTTYPE_IGNORE) != 0)
1022 if (strcmp (mntent->mnt_type, "proc") == 0)
1024 strncpy (route_buffer, mntent->mnt_dir,
1025 sizeof (route_buffer)-10);
1026 route_buffer [sizeof (route_buffer)-10] = '\0';
1027 strcat (route_buffer, "/net/route");
1030 return (route_buffer);
1033 mntent = getmntent (fp);
1038 syslog (LOG_ERR, "proc file system not mounted");
1043 * close_route_table - close the interface to the route table
1046 static void close_route_table (void)
1048 if (route_fd != (FILE *) 0)
1051 route_fd = (FILE *) 0;
1056 * open_route_table - open the interface to the route table
1059 static int open_route_table (void)
1063 close_route_table();
1065 path = path_to_route();
1071 route_fd = fopen (path, "r");
1072 if (route_fd == (FILE *) 0)
1074 syslog (LOG_ERR, "can not open %s: %m", path);
1081 * read_route_table - read the next entry from the route table
1084 static int read_route_table (struct rtentry *rt)
1086 static char delims[] = " \t\n";
1087 char *dev_ptr, *ptr, *dst_ptr, *gw_ptr, *flag_ptr;
1089 memset (rt, '\0', sizeof (struct rtentry));
1093 if (fgets (route_buffer, sizeof (route_buffer), route_fd) ==
1099 dev_ptr = strtok (route_buffer, delims); /* interface name */
1100 dst_ptr = strtok (NULL, delims); /* destination address */
1101 gw_ptr = strtok (NULL, delims); /* gateway */
1102 flag_ptr = strtok (NULL, delims); /* flags */
1104 if (flag_ptr == (char *) 0) /* assume that we failed, somewhere. */
1109 /* Discard that stupid header line which should never
1110 * have been there in the first place !! */
1111 if (isxdigit (*dst_ptr) && isxdigit (*gw_ptr) && isxdigit (*flag_ptr))
1117 ((struct sockaddr_in *) &rt->rt_dst)->sin_addr.s_addr =
1118 strtoul (dst_ptr, NULL, 16);
1120 ((struct sockaddr_in *) &rt->rt_gateway)->sin_addr.s_addr =
1121 strtoul (gw_ptr, NULL, 16);
1123 rt->rt_flags = (short) strtoul (flag_ptr, NULL, 16);
1124 rt->rt_dev = dev_ptr;
1130 * defaultroute_exists - determine if there is a default route
1133 static int defaultroute_exists (void)
1138 if (!open_route_table())
1143 while (read_route_table(&rt) != 0)
1145 if ((rt.rt_flags & RTF_UP) == 0)
1150 if (((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr == 0L)
1153 "ppp not replacing existing default route to %s[%s]",
1155 inet_ntoa (((struct sockaddr_in *) &rt.rt_gateway)->
1162 close_route_table();
1167 * sifdefaultroute - assign a default route through the address given.
1170 int sifdefaultroute (int unit, int gateway)
1174 if (has_default_route == 0)
1176 if (defaultroute_exists())
1181 memset (&rt, '\0', sizeof (rt));
1182 SET_SA_FAMILY (rt.rt_dst, AF_INET);
1183 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
1184 ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = gateway;
1186 rt.rt_flags = RTF_UP | RTF_GATEWAY;
1187 if (ioctl(sockfd, SIOCADDRT, &rt) < 0)
1189 syslog (LOG_ERR, "default route ioctl(SIOCADDRT): %m");
1193 has_default_route = 1;
1194 default_route_gateway = g;
1199 * cifdefaultroute - delete a default route through the address given.
1202 int cifdefaultroute (int unit, int gateway)
1206 if (has_default_route)
1208 memset (&rt, '\0', sizeof (rt));
1209 SET_SA_FAMILY (rt.rt_dst, AF_INET);
1210 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
1211 ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = gateway;
1213 rt.rt_flags = RTF_UP | RTF_GATEWAY;
1214 if (ioctl(sockfd, SIOCDELRT, &rt) < 0 && errno != ESRCH)
1218 syslog (LOG_ERR, "default route ioctl(SIOCDELRT): %m");
1223 has_default_route = 0;
1228 * sifproxyarp - Make a proxy ARP entry for the peer.
1231 int sifproxyarp (int unit, u_int32_t his_adr)
1233 struct arpreq arpreq;
1235 if (has_proxy_arp == 0)
1237 memset (&arpreq, '\0', sizeof(arpreq));
1239 * Get the hardware address of an interface on the same subnet
1240 * as our local address.
1242 if (!get_ether_addr(his_adr, &arpreq.arp_ha))
1244 syslog(LOG_ERR, "Cannot determine ethernet address for proxy ARP");
1248 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1249 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = his_adr;
1250 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1252 if (ioctl(sockfd, SIOCSARP, (caddr_t)&arpreq) < 0)
1254 syslog(LOG_ERR, "ioctl(SIOCSARP): %m");
1259 proxy_arp_addr = hisaddr;
1265 * cifproxyarp - Delete the proxy ARP entry for the peer.
1268 int cifproxyarp (int unit, u_int32_t his_adr)
1270 struct arpreq arpreq;
1272 if (has_proxy_arp == 1)
1274 memset (&arpreq, '\0', sizeof(arpreq));
1275 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1277 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = his_adr;
1278 if (ioctl(sockfd, SIOCDARP, (caddr_t)&arpreq) < 0)
1280 syslog(LOG_WARNING, "ioctl(SIOCDARP): %m");
1289 * get_ether_addr - get the hardware address of an interface on the
1290 * the same subnet as ipaddr.
1293 static int get_ether_addr (u_int32_t ipaddr, struct sockaddr *hwaddr)
1295 struct ifreq *ifr, *ifend, *ifp;
1297 u_int32_t ina, mask;
1298 struct sockaddr_dl *dla;
1301 struct ifreq ifs[MAX_IFS];
1303 ifc.ifc_len = sizeof(ifs);
1305 if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0)
1307 syslog(LOG_ERR, "ioctl(SIOCGIFCONF): %m");
1311 MAINDEBUG ((LOG_DEBUG, "proxy arp: scanning %d interfaces for IP %s",
1312 ifc.ifc_len / sizeof(struct ifreq), ip_ntoa(ipaddr)));
1314 * Scan through looking for an interface with an Internet
1315 * address on the same subnet as `ipaddr'.
1317 ifend = ifs + (ifc.ifc_len / sizeof(struct ifreq));
1318 for (ifr = ifc.ifc_req; ifr < ifend; ifr++)
1320 if (ifr->ifr_addr.sa_family == AF_INET)
1322 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1323 strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1324 MAINDEBUG ((LOG_DEBUG, "proxy arp: examining interface %s",
1327 * Check that the interface is up, and not point-to-point
1330 if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
1335 if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0)
1340 * Get its netmask and check that it's on the right subnet.
1342 if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
1347 mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr;
1348 MAINDEBUG ((LOG_DEBUG, "proxy arp: interface addr %s mask %lx",
1349 ip_ntoa(ina), ntohl(mask)));
1351 if (((ipaddr ^ ina) & mask) != 0)
1364 syslog(LOG_INFO, "found interface %s for proxy arp", ifreq.ifr_name);
1366 * Now get the hardware address.
1368 memset (&ifreq.ifr_hwaddr, 0, sizeof (struct sockaddr));
1369 if (ioctl (sockfd, SIOCGIFHWADDR, &ifreq) < 0)
1371 syslog(LOG_ERR, "SIOCGIFHWADDR(%s): %m", ifreq.ifr_name);
1377 sizeof (struct sockaddr));
1379 MAINDEBUG ((LOG_DEBUG,
1380 "proxy arp: found hwaddr %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
1381 (int) ((unsigned char *) &hwaddr->sa_data)[0],
1382 (int) ((unsigned char *) &hwaddr->sa_data)[1],
1383 (int) ((unsigned char *) &hwaddr->sa_data)[2],
1384 (int) ((unsigned char *) &hwaddr->sa_data)[3],
1385 (int) ((unsigned char *) &hwaddr->sa_data)[4],
1386 (int) ((unsigned char *) &hwaddr->sa_data)[5],
1387 (int) ((unsigned char *) &hwaddr->sa_data)[6],
1388 (int) ((unsigned char *) &hwaddr->sa_data)[7]));
1393 * Return user specified netmask, modified by any mask we might determine
1394 * for address `addr' (in network byte order).
1395 * Here we scan through the system's list of interfaces, looking for
1396 * any non-point-to-point interfaces which might appear to be on the same
1397 * network as `addr'. If we find any, we OR in their netmask to the
1398 * user-specified netmask.
1401 u_int32_t GetMask (u_int32_t addr)
1403 u_int32_t mask, nmask, ina;
1404 struct ifreq *ifr, *ifend, ifreq;
1406 struct ifreq ifs[MAX_IFS];
1410 if (IN_CLASSA(addr)) /* determine network mask for address class */
1412 nmask = IN_CLASSA_NET;
1416 if (IN_CLASSB(addr))
1418 nmask = IN_CLASSB_NET;
1422 nmask = IN_CLASSC_NET;
1426 /* class D nets are disallowed by bad_ip_adrs */
1427 mask = netmask | htonl(nmask);
1429 * Scan through the system's network interfaces.
1431 ifc.ifc_len = sizeof(ifs);
1433 if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0)
1435 syslog(LOG_WARNING, "ioctl(SIOCGIFCONF): %m");
1439 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1440 for (ifr = ifc.ifc_req; ifr < ifend; ifr++)
1443 * Check the interface's internet address.
1445 if (ifr->ifr_addr.sa_family != AF_INET)
1449 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1450 if (((ntohl(ina) ^ addr) & nmask) != 0)
1455 * Check that the interface is up, and not point-to-point nor loopback.
1457 strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1458 if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
1463 if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0)
1468 * Get its netmask and OR it into our mask.
1470 if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
1474 mask |= ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr.s_addr;
1481 * Internal routine to decode the version.modification.patch level
1484 static void decode_version (char *buf, int *version,
1485 int *modification, int *patch)
1487 *version = (int) strtoul (buf, &buf, 10);
1494 *modification = (int) strtoul (buf, &buf, 10);
1498 *patch = (int) strtoul (buf, &buf, 10);
1511 * Procedure to determine if the PPP line dicipline is registered.
1515 ppp_registered(void)
1518 int ppp_disc = N_PPP;
1522 local_fd = open(devnam, O_NONBLOCK | O_RDWR, 0);
1525 syslog(LOG_ERR, "Failed to open %s: %m", devnam);
1529 initfdflags = fcntl(local_fd, F_GETFL);
1530 if (initfdflags == -1)
1532 syslog(LOG_ERR, "Couldn't get device fd flags: %m");
1537 initfdflags &= ~O_NONBLOCK;
1538 fcntl(local_fd, F_SETFL, initfdflags);
1540 * Read the initial line dicipline and try to put the device into the
1543 if (ioctl(local_fd, TIOCGETD, &init_disc) < 0)
1545 syslog(LOG_ERR, "ioctl(TIOCGETD): %m");
1550 if (ioctl(local_fd, TIOCSETD, &ppp_disc) < 0)
1552 syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
1557 if (ioctl(local_fd, TIOCSETD, &init_disc) < 0)
1559 syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
1569 * ppp_available - check whether the system has any ppp interfaces
1570 * (in fact we check whether we can do an ioctl on ppp0).
1573 int ppp_available(void)
1577 char abBuffer [1024];
1579 int my_version, my_modification, my_patch;
1581 * Open a socket for doing the ioctl operations.
1583 s = socket(AF_INET, SOCK_DGRAM, 0);
1589 strncpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
1590 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
1592 * If the device did not exist then attempt to create one by putting the
1593 * current tty into the PPP discipline. If this works then obtain the
1594 * flags for the device again.
1598 if (ppp_registered())
1600 strncpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
1601 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
1605 * Ensure that the hardware address is for PPP and not something else
1609 ok = ioctl (s, SIOCGIFHWADDR, (caddr_t) &ifr) >= 0;
1612 if (ok && ((ifr.ifr_hwaddr.sa_family & ~0xFF) != ARPHRD_PPP))
1622 * This is the PPP device. Validate the version of the driver at this
1623 * point to ensure that this program will work with the driver.
1625 ifr.ifr_data = abBuffer;
1626 size = ioctl (s, SIOCGPPPVER, (caddr_t) &ifr);
1631 decode_version (abBuffer,
1633 &driver_modification,
1640 driver_modification =
1644 * Validate the version of the driver against the version that we used.
1646 decode_version (PPP_VERSION,
1651 /* The version numbers must match */
1652 if (driver_version != my_version)
1657 /* The modification levels must be legal */
1658 if (driver_modification < my_modification)
1665 fprintf(stderr, "Sorry - PPP driver version %d.%d.%d is out of date\n",
1666 driver_version, driver_modification, driver_patch);
1676 * Update the wtmp file with the appropriate user name and tty device.
1679 int logwtmp (char *line, char *name, char *host)
1684 * Control the 'mesg' function based upon the state of the logon
1687 mode = (*name != '\0') ? 0600 : 0622;
1688 if (chmod (devnam, mode) < 0)
1690 syslog (LOG_ERR, "chmod(\"%s\", 0%o): %m", devnam, mode);
1693 * Update the signon database for users.
1695 memset (&ut, 0, sizeof (ut));
1696 (void)strncpy(ut.ut_line, line, sizeof(ut.ut_line));
1697 (void)strncpy(ut.ut_name, name, sizeof(ut.ut_name));
1698 (void)strncpy(ut.ut_host, host, sizeof(ut.ut_host));
1699 (void)time(&ut.ut_time);
1701 pututline (&ut); /* Write the line to the proper place */
1702 endutent(); /* Indicate operation is complete */
1706 * Code for locking/unlocking the serial device.
1707 * This code is derived from chat.c.
1710 #define LOCK_PREFIX "/var/lock/LCK.."
1713 * lock - create a lock file for the named device
1716 int lock (char *dev)
1718 char hdb_lock_buffer[12];
1722 p = strrchr(dev, '/');
1728 lock_file = malloc(strlen(LOCK_PREFIX) + strlen(dev) + 1);
1729 if (lock_file == NULL)
1731 novm("lock file name");
1734 strcpy (lock_file, LOCK_PREFIX);
1735 strcat (lock_file, dev);
1737 * Attempt to create the lock file at this point.
1741 fd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644);
1744 sprintf(hdb_lock_buffer, "%010d\n", getpid());
1745 write(fd, hdb_lock_buffer, 11);
1750 * If the file exists then check to see if the pid is stale
1752 if (errno == EEXIST)
1754 fd = open(lock_file, O_RDONLY, 0);
1757 if (errno == ENOENT) /* This is just a timing problem. */
1764 /* Read the lock file to find out who has the device locked */
1765 n = read (fd, hdb_lock_buffer, 11);
1769 syslog(LOG_ERR, "Can't read pid from lock file %s", lock_file);
1773 /* See the process still exists. */
1776 hdb_lock_buffer[n] = '\0';
1777 sscanf (hdb_lock_buffer, " %d", &pid);
1778 if (kill(pid, 0) == -1 && errno == ESRCH)
1784 /* If the process does not exist then try to remove the lock */
1785 if (n == 0 && unlink (lock_file) == 0)
1787 syslog (LOG_NOTICE, "Removed stale lock on %s (pid %d)",
1792 syslog (LOG_NOTICE, "Device %s is locked by pid %d", dev, pid);
1796 syslog(LOG_ERR, "Can't create lock file %s: %m", lock_file);
1806 * unlock - remove our lockfile