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 ipaddrs[2]; /* Local and remote addrs we've set */
70 static u_int32_t default_route_gateway; /* Gateway for default route added */
71 static u_int32_t proxy_arp_addr; /* Addr for proxy arp entry added */
73 static char *lock_file;
77 #define FLAGS_GOOD (IFF_UP | IFF_BROADCAST)
78 #define FLAGS_MASK (IFF_UP | IFF_BROADCAST | \
79 IFF_POINTOPOINT | IFF_LOOPBACK | IFF_NOARP)
81 /* Prototypes for procedures local to this file. */
82 static int get_flags (void);
83 static void set_flags (int flags);
84 static int translate_speed (int bps);
85 static int baud_rate_of (int speed);
86 static char *path_to_route (void);
87 static void close_route_table (void);
88 static int open_route_table (void);
89 static int read_route_table (struct rtentry *rt);
90 static int defaultroute_exists (void);
91 static int get_ether_addr (u_int32_t ipaddr, struct sockaddr *hwaddr);
92 static void decode_version (char *buf, int *version, int *mod, int *patch);
96 * SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
100 #define SET_SA_FAMILY(addr, family) \
101 memset ((char *) &(addr), '\0', sizeof(addr)); \
102 addr.sa_family = (family);
105 * Determine if the PPP connection should still be present.
109 #define still_ppp() (hungup == 0)
112 * Functions to read and set the flags value in the device driver
115 static int get_flags (void)
119 if (ioctl(ttyfd, PPPIOCGFLAGS, (caddr_t) &flags) < 0)
121 syslog(LOG_ERR, "ioctl(PPPIOCGFLAGS): %m");
125 MAINDEBUG ((LOG_DEBUG, "get flags = %x\n", flags));
129 static void set_flags (int flags)
131 MAINDEBUG ((LOG_DEBUG, "set flags = %x\n", flags));
133 if (ioctl(ttyfd, PPPIOCSFLAGS, (caddr_t) &flags) < 0)
135 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS, %x): %m", flags);
141 * sys_init - System-dependent initialization.
146 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
147 setlogmask(LOG_UPTO(LOG_INFO));
150 setlogmask(LOG_UPTO(LOG_DEBUG));
153 /* Get an internet socket for doing socket ioctls. */
154 sockfd = socket(AF_INET, SOCK_DGRAM, 0);
157 syslog(LOG_ERR, "Couldn't create IP socket: %m");
163 * sys_cleanup - restore any system state we modified before exiting:
164 * mark the interface down, delete default route and/or proxy arp entry.
165 * This should call die() because it's called from die().
174 cifaddr(0, ipaddrs[0], ipaddrs[1]);
175 /* XXX maybe we need to delete the route through the interface */
176 if (has_default_route)
177 cifdefaultroute(0, default_route_gateway);
179 cifproxyarp(0, proxy_arp_addr);
183 * note_debug_level - note a change in the debug level.
186 void note_debug_level (void)
190 MAINDEBUG ((LOG_INFO, "Debug turned ON, Level %d", debug));
191 setlogmask(LOG_UPTO(LOG_DEBUG));
195 setlogmask(LOG_UPTO(LOG_WARNING));
200 * set_kdebugflag - Define the debugging level for the kernel
203 int set_kdebugflag (int requested_level)
205 if (ioctl(ttyfd, PPPIOCGDEBUG, &prev_kdebugflag) < 0)
207 syslog(LOG_ERR, "ioctl(PPPIOCGDEBUG): %m");
211 if (prev_kdebugflag != requested_level)
213 if (ioctl(ttyfd, PPPIOCSDEBUG, &requested_level) < 0)
215 syslog (LOG_ERR, "ioctl(PPPIOCSDEBUG): %m");
218 MAINDEBUG ((LOG_INFO, "set kernel debugging level to %d",
225 * establish_ppp - Turn the serial port into a ppp interface.
228 void establish_ppp (int fd)
233 if (ioctl(fd, TIOCEXCL, 0) < 0)
235 syslog (LOG_WARNING, "ioctl(TIOCEXCL): %m");
238 if (ioctl(fd, TIOCGETD, &initdisc) < 0)
240 syslog(LOG_ERR, "ioctl(TIOCGETD): %m");
244 if (ioctl(fd, TIOCSETD, &pppdisc) < 0)
246 syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
250 if (ioctl(fd, PPPIOCGUNIT, &ifunit) < 0)
252 syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m");
256 set_kdebugflag (kdebugflag);
258 set_flags (get_flags() & ~(SC_RCV_B7_0 | SC_RCV_B7_1 |
259 SC_RCV_EVNP | SC_RCV_ODDP));
261 MAINDEBUG ((LOG_NOTICE, "Using version %d.%d.%d of PPP driver",
262 driver_version, driver_modification, driver_patch));
265 * Set device for non-blocking reads.
267 if ((initfdflags = fcntl(fd, F_GETFL)) == -1
268 || fcntl(fd, F_SETFL, initfdflags | O_NONBLOCK) == -1) {
270 syslog(LOG_WARNING, "Couldn't set device to non-blocking mode: %m");
275 * disestablish_ppp - Restore the serial port to normal operation.
276 * This shouldn't call die() because it's called from die().
279 void disestablish_ppp(int fd)
284 /* Reset non-blocking mode on the file descriptor. */
285 if (initfdflags != -1 && fcntl(fd, F_SETFL, initfdflags) < 0)
286 syslog(LOG_WARNING, "Couldn't restore device fd flags: %m");
289 if (still_ppp() && initdisc >= 0)
291 set_kdebugflag (prev_kdebugflag);
293 if (ioctl(fd, TIOCSETD, &initdisc) < 0)
295 syslog(LOG_WARNING, "ioctl(TIOCSETD): %m");
298 if (ioctl(fd, TIOCNXCL, 0) < 0)
300 syslog (LOG_WARNING, "ioctl(TIOCNXCL): %m");
307 * clean_check - Fetch the flags for the device and generate
308 * appropriate error messages.
310 void clean_check(void)
312 if (still_ppp() && initdisc >= 0)
314 if (ioctl(ttyfd, PPPIOCGFLAGS, (caddr_t) &x) == 0)
317 switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP))
319 case SC_RCV_B7_0 | SC_RCV_B7_1 | SC_RCV_EVNP | SC_RCV_ODDP:
320 s = "nothing was received";
324 case SC_RCV_B7_0 | SC_RCV_EVNP:
325 case SC_RCV_B7_0 | SC_RCV_ODDP:
326 case SC_RCV_B7_0 | SC_RCV_ODDP | SC_RCV_EVNP:
327 s = "all had bit 7 set to 1";
331 case SC_RCV_B7_1 | SC_RCV_EVNP:
332 case SC_RCV_B7_1 | SC_RCV_ODDP:
333 case SC_RCV_B7_1 | SC_RCV_ODDP | SC_RCV_EVNP:
334 s = "all had bit 7 set to 0";
338 s = "all had odd parity";
342 s = "all had even parity";
348 syslog(LOG_WARNING, "Receive serial link is not"
350 syslog(LOG_WARNING, "Problem: %s", s);
358 * List of valid speeds.
362 int speed_int, speed_val;
434 * Translate from bits/second to a speed_t.
437 static int translate_speed (int bps)
439 struct speed *speedp;
443 for (speedp = speeds; speedp->speed_int; speedp++)
445 if (bps == speedp->speed_int)
447 return speedp->speed_val;
450 syslog(LOG_WARNING, "speed %d not supported", bps);
456 * Translate from a speed_t to bits/second.
459 static int baud_rate_of (int speed)
461 struct speed *speedp;
465 for (speedp = speeds; speedp->speed_int; speedp++)
467 if (speed == speedp->speed_val)
469 return speedp->speed_int;
477 * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
478 * at the requested speed, etc. If `local' is true, set CLOCAL
479 * regardless of whether the modem option was specified.
482 void set_up_tty (int fd, int local)
487 if (tcgetattr(fd, &tios) < 0)
489 syslog(LOG_ERR, "tcgetattr: %m");
498 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
499 tios.c_cflag |= CS8 | CREAD | HUPCL;
501 tios.c_iflag = IGNBRK | IGNPAR;
505 tios.c_cc[VTIME] = 0;
509 tios.c_cflag ^= (CLOCAL | HUPCL);
515 tios.c_cflag |= CRTSCTS;
519 tios.c_iflag |= IXON | IXOFF;
520 tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */
521 tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */
525 tios.c_cflag &= ~CRTSCTS;
532 speed = translate_speed(inspeed);
535 cfsetospeed (&tios, speed);
536 cfsetispeed (&tios, speed);
539 * We can't proceed if the serial port speed is B0,
540 * since that implies that the serial port is disabled.
544 speed = cfgetospeed(&tios);
547 syslog(LOG_ERR, "Baud rate for %s is 0; need explicit baud rate",
553 if (tcsetattr(fd, TCSAFLUSH, &tios) < 0)
555 syslog(LOG_ERR, "tcsetattr: %m");
559 baud_rate = baud_rate_of(speed);
564 * setdtr - control the DTR line on the serial port.
565 * This is called from die(), so it shouldn't call die().
568 void setdtr (int fd, int on)
570 int modembits = TIOCM_DTR;
572 ioctl(fd, (on ? TIOCMBIS : TIOCMBIC), &modembits);
576 * restore_tty - restore the terminal to the saved settings.
579 void restore_tty (int fd)
585 * Turn off echoing, because otherwise we can get into
586 * a loop with the tty and the modem echoing to each other.
587 * We presume we are the sole user of this tty device, so
588 * when we close it, it will revert to its defaults anyway.
592 inittermios.c_lflag &= ~(ECHO | ECHONL);
595 if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0)
599 syslog(LOG_WARNING, "tcsetattr: %m");
606 * output - Output PPP packet.
609 void output (int unit, unsigned char *p, int len)
613 log_packet(p, len, "sent ");
616 if (write(ttyfd, p, len) < 0)
618 if (errno == EWOULDBLOCK || errno == ENOBUFS
619 || errno == ENXIO || errno == EIO)
621 syslog(LOG_WARNING, "write: warning: %m");
625 syslog(LOG_ERR, "write: %m");
632 * wait_input - wait until there is data available on ttyfd,
633 * for the length of time specified by *timo (indefinite
637 void wait_input (struct timeval *timo)
643 FD_SET(ttyfd, &ready);
645 n = select(ttyfd+1, &ready, NULL, &ready, timo);
646 if (n < 0 && errno != EINTR)
648 syslog(LOG_ERR, "select: %m");
654 * read_packet - get a PPP packet from the serial device.
657 int read_packet (unsigned char *buf)
661 len = read(ttyfd, buf, PPP_MTU + PPP_HDRLEN);
664 if (errno == EWOULDBLOCK)
668 syslog(LOG_ERR, "read: %m");
675 * ppp_send_config - configure the transmit characteristics of
679 void ppp_send_config (int unit,int mtu,u_int32_t asyncmap,int pcomp,int accomp)
684 MAINDEBUG ((LOG_DEBUG, "send_config: mtu = %d\n", mtu));
686 * Ensure that the link is still up.
691 * Set the MTU and other parameters for the ppp device
693 memset (&ifr, '\0', sizeof (ifr));
694 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
697 if (ioctl(sockfd, SIOCSIFMTU, (caddr_t) &ifr) < 0)
699 syslog(LOG_ERR, "ioctl(SIOCSIFMTU): %m");
703 MAINDEBUG ((LOG_DEBUG, "send_config: asyncmap = %lx\n", asyncmap));
704 if (ioctl(ttyfd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0)
706 syslog(LOG_ERR, "ioctl(PPPIOCSASYNCMAP): %m");
711 x = pcomp ? x | SC_COMP_PROT : x & ~SC_COMP_PROT;
712 x = accomp ? x | SC_COMP_AC : x & ~SC_COMP_AC;
718 * ppp_set_xaccm - set the extended transmit ACCM for the interface.
721 void ppp_set_xaccm (int unit, ext_accm accm)
723 MAINDEBUG ((LOG_DEBUG, "set_xaccm: %08lx %08lx %08lx %08lx\n",
724 accm[0], accm[1], accm[2], accm[3]));
726 if (ioctl(ttyfd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY)
728 syslog(LOG_WARNING, "ioctl(set extended ACCM): %m");
733 * ppp_recv_config - configure the receive-side characteristics of
737 void ppp_recv_config (int unit,int mru,u_int32_t asyncmap,int pcomp,int accomp)
741 MAINDEBUG ((LOG_DEBUG, "recv_config: mru = %d\n", mru));
743 * If we were called because the link has gone down then there is nothing
744 * which may be done. Just return without incident.
751 * Set the receiver parameters
753 if (ioctl(ttyfd, PPPIOCSMRU, (caddr_t) &mru) < 0)
755 syslog(LOG_ERR, "ioctl(PPPIOCSMRU): %m");
758 MAINDEBUG ((LOG_DEBUG, "recv_config: asyncmap = %lx\n", asyncmap));
759 if (ioctl(ttyfd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0)
761 syslog(LOG_ERR, "ioctl(PPPIOCSRASYNCMAP): %m");
766 x = !accomp? x | SC_REJ_COMP_AC: x &~ SC_REJ_COMP_AC;
771 * ccp_test - ask kernel whether a given compression method
772 * is acceptable for use.
775 int ccp_test (int unit, u_char *opt_ptr, int opt_len, int for_transmit)
777 struct ppp_option_data data;
779 memset (&data, '\0', sizeof (data));
781 data.length = opt_len;
782 data.transmit = for_transmit;
784 if (ioctl(ttyfd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0)
789 return (errno == ENOBUFS)? 0: -1;
793 * ccp_flags_set - inform kernel about the current state of CCP.
796 void ccp_flags_set (int unit, int isopen, int isup)
801 x = isopen? x | SC_CCP_OPEN : x &~ SC_CCP_OPEN;
802 x = isup? x | SC_CCP_UP : x &~ SC_CCP_UP;
808 * ccp_fatal_error - returns 1 if decompression was disabled as a
809 * result of an error detected after decompression of a packet,
810 * 0 otherwise. This is necessary because of patent nonsense.
813 int ccp_fatal_error (int unit)
817 return x & SC_DC_FERROR;
821 * sifvjcomp - config tcp header compression
824 int sifvjcomp (int u, int vjcomp, int cidcomp, int maxcid)
826 u_int x = get_flags();
830 if (ioctl (ttyfd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0)
832 syslog (LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
837 x = vjcomp ? x | SC_COMP_TCP : x &~ SC_COMP_TCP;
838 x = cidcomp ? x & ~SC_NO_TCP_CCID : x | SC_NO_TCP_CCID;
845 * sifup - Config the interface up and enable IP packets to pass.
852 memset (&ifr, '\0', sizeof (ifr));
853 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
854 if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0)
856 syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
860 ifr.ifr_flags |= (IFF_UP | IFF_POINTOPOINT);
861 if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0)
863 syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
871 * sifdown - Config the interface down and disable IP.
878 memset (&ifr, '\0', sizeof (ifr));
879 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
880 if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0)
882 syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
886 ifr.ifr_flags &= ~IFF_UP;
887 ifr.ifr_flags |= IFF_POINTOPOINT;
888 if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0)
890 syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
898 * sifaddr - Config the interface IP addresses and netmask.
901 int sifaddr (int unit, int our_adr, int his_adr, int net_mask)
906 memset (&ifr, '\0', sizeof (ifr));
907 memset (&rt, '\0', sizeof (rt));
909 SET_SA_FAMILY (ifr.ifr_addr, AF_INET);
910 SET_SA_FAMILY (ifr.ifr_dstaddr, AF_INET);
911 SET_SA_FAMILY (ifr.ifr_netmask, AF_INET);
913 strncpy (ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
917 ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = our_adr;
918 if (ioctl(sockfd, SIOCSIFADDR, (caddr_t) &ifr) < 0)
922 syslog (LOG_ERR, "ioctl(SIOCAIFADDR): %m");
926 syslog (LOG_WARNING, "ioctl(SIOCAIFADDR): Address already exists");
931 * Set the gateway address
933 ((struct sockaddr_in *) &ifr.ifr_dstaddr)->sin_addr.s_addr = his_adr;
934 if (ioctl(sockfd, SIOCSIFDSTADDR, (caddr_t) &ifr) < 0)
936 syslog (LOG_ERR, "ioctl(SIOCSIFDSTADDR): %m");
944 ((struct sockaddr_in *) &ifr.ifr_netmask)->sin_addr.s_addr = net_mask;
945 if (ioctl(sockfd, SIOCSIFNETMASK, (caddr_t) &ifr) < 0)
947 syslog (LOG_ERR, "ioctl(SIOCSIFNETMASK): %m");
952 * Add the device route
954 SET_SA_FAMILY (rt.rt_dst, AF_INET);
955 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
956 rt.rt_dev = ifname; /* MJC */
958 ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = 0L;
959 ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = his_adr;
960 rt.rt_flags = RTF_UP | RTF_HOST;
962 if (ioctl(sockfd, SIOCADDRT, &rt) < 0)
964 syslog (LOG_ERR, "ioctl(SIOCADDRT) device route: %m");
968 ipaddrs[0] = our_adr;
969 ipaddrs[1] = his_adr;
974 * cifaddr - Clear the interface IP addresses, and delete routes
975 * through the interface if possible.
978 int cifaddr (int unit, int our_adr, int his_adr)
984 * Delete the route through the device
986 memset (&rt, '\0', sizeof (rt));
988 SET_SA_FAMILY (rt.rt_dst, AF_INET);
989 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
990 rt.rt_dev = ifname; /* MJC */
992 ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = 0;
993 ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = his_adr;
994 rt.rt_flags = RTF_UP | RTF_HOST;
996 if (ioctl(sockfd, SIOCDELRT, &rt) < 0 && errno != ESRCH)
1000 syslog (LOG_ERR, "ioctl(SIOCDELRT) device route: %m");
1008 * path_to_route - determine the path to the proc file system data
1011 FILE *route_fd = (FILE *) 0;
1012 static char route_buffer [512];
1014 static char *path_to_route (void);
1015 static int open_route_table (void);
1016 static void close_route_table (void);
1017 static int read_route_table (struct rtentry *rt);
1018 static int defaultroute_exists (void);
1021 * path_to_route - find the path to the route tables in the proc file system
1024 static char *path_to_route (void)
1026 struct mntent *mntent;
1029 fp = fopen (MOUNTED, "r");
1032 mntent = getmntent (fp);
1033 while (mntent != (struct mntent *) 0)
1035 if (strcmp (mntent->mnt_type, MNTTYPE_IGNORE) != 0)
1037 if (strcmp (mntent->mnt_type, "proc") == 0)
1039 strncpy (route_buffer, mntent->mnt_dir,
1040 sizeof (route_buffer)-10);
1041 route_buffer [sizeof (route_buffer)-10] = '\0';
1042 strcat (route_buffer, "/net/route");
1045 return (route_buffer);
1048 mntent = getmntent (fp);
1053 syslog (LOG_ERR, "proc file system not mounted");
1058 * close_route_table - close the interface to the route table
1061 static void close_route_table (void)
1063 if (route_fd != (FILE *) 0)
1066 route_fd = (FILE *) 0;
1071 * open_route_table - open the interface to the route table
1074 static int open_route_table (void)
1078 close_route_table();
1080 path = path_to_route();
1086 route_fd = fopen (path, "r");
1087 if (route_fd == (FILE *) 0)
1089 syslog (LOG_ERR, "can not open %s: %m", path);
1096 * read_route_table - read the next entry from the route table
1099 static int read_route_table (struct rtentry *rt)
1101 static char delims[] = " \t\n";
1102 char *dev_ptr, *ptr, *dst_ptr, *gw_ptr, *flag_ptr;
1104 memset (rt, '\0', sizeof (struct rtentry));
1108 if (fgets (route_buffer, sizeof (route_buffer), route_fd) ==
1114 dev_ptr = strtok (route_buffer, delims); /* interface name */
1115 dst_ptr = strtok (NULL, delims); /* destination address */
1116 gw_ptr = strtok (NULL, delims); /* gateway */
1117 flag_ptr = strtok (NULL, delims); /* flags */
1119 if (flag_ptr == (char *) 0) /* assume that we failed, somewhere. */
1124 /* Discard that stupid header line which should never
1125 * have been there in the first place !! */
1126 if (isxdigit (*dst_ptr) && isxdigit (*gw_ptr) && isxdigit (*flag_ptr))
1132 ((struct sockaddr_in *) &rt->rt_dst)->sin_addr.s_addr =
1133 strtoul (dst_ptr, NULL, 16);
1135 ((struct sockaddr_in *) &rt->rt_gateway)->sin_addr.s_addr =
1136 strtoul (gw_ptr, NULL, 16);
1138 rt->rt_flags = (short) strtoul (flag_ptr, NULL, 16);
1139 rt->rt_dev = dev_ptr;
1145 * defaultroute_exists - determine if there is a default route
1148 static int defaultroute_exists (void)
1153 if (!open_route_table())
1158 while (read_route_table(&rt) != 0)
1160 if ((rt.rt_flags & RTF_UP) == 0)
1165 if (((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr == 0L)
1168 "ppp not replacing existing default route to %s[%s]",
1170 inet_ntoa (((struct sockaddr_in *) &rt.rt_gateway)->
1177 close_route_table();
1182 * sifdefaultroute - assign a default route through the address given.
1185 int sifdefaultroute (int unit, int gateway)
1189 if (has_default_route == 0)
1191 if (defaultroute_exists())
1196 memset (&rt, '\0', sizeof (rt));
1197 SET_SA_FAMILY (rt.rt_dst, AF_INET);
1198 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
1199 ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = gateway;
1201 rt.rt_flags = RTF_UP | RTF_GATEWAY;
1202 if (ioctl(sockfd, SIOCADDRT, &rt) < 0)
1204 syslog (LOG_ERR, "default route ioctl(SIOCADDRT): %m");
1208 has_default_route = 1;
1209 default_route_gateway = g;
1214 * cifdefaultroute - delete a default route through the address given.
1217 int cifdefaultroute (int unit, int gateway)
1221 if (has_default_route)
1223 memset (&rt, '\0', sizeof (rt));
1224 SET_SA_FAMILY (rt.rt_dst, AF_INET);
1225 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
1226 ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = gateway;
1228 rt.rt_flags = RTF_UP | RTF_GATEWAY;
1229 if (ioctl(sockfd, SIOCDELRT, &rt) < 0 && errno != ESRCH)
1233 syslog (LOG_ERR, "default route ioctl(SIOCDELRT): %m");
1238 has_default_route = 0;
1243 * sifproxyarp - Make a proxy ARP entry for the peer.
1246 int sifproxyarp (int unit, u_int32_t his_adr)
1248 struct arpreq arpreq;
1250 if (has_proxy_arp == 0)
1252 memset (&arpreq, '\0', sizeof(arpreq));
1254 * Get the hardware address of an interface on the same subnet
1255 * as our local address.
1257 if (!get_ether_addr(his_adr, &arpreq.arp_ha))
1259 syslog(LOG_ERR, "Cannot determine ethernet address for proxy ARP");
1263 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1264 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = his_adr;
1265 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1267 if (ioctl(sockfd, SIOCSARP, (caddr_t)&arpreq) < 0)
1269 syslog(LOG_ERR, "ioctl(SIOCSARP): %m");
1274 proxy_arp_addr = hisaddr;
1280 * cifproxyarp - Delete the proxy ARP entry for the peer.
1283 int cifproxyarp (int unit, u_int32_t his_adr)
1285 struct arpreq arpreq;
1287 if (has_proxy_arp == 1)
1289 memset (&arpreq, '\0', sizeof(arpreq));
1290 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1292 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = his_adr;
1293 if (ioctl(sockfd, SIOCDARP, (caddr_t)&arpreq) < 0)
1295 syslog(LOG_WARNING, "ioctl(SIOCDARP): %m");
1304 * get_ether_addr - get the hardware address of an interface on the
1305 * the same subnet as ipaddr.
1308 static int get_ether_addr (u_int32_t ipaddr, struct sockaddr *hwaddr)
1310 struct ifreq *ifr, *ifend, *ifp;
1312 u_int32_t ina, mask;
1313 struct sockaddr_dl *dla;
1316 struct ifreq ifs[MAX_IFS];
1318 ifc.ifc_len = sizeof(ifs);
1320 if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0)
1322 syslog(LOG_ERR, "ioctl(SIOCGIFCONF): %m");
1326 MAINDEBUG ((LOG_DEBUG, "proxy arp: scanning %d interfaces for IP %s",
1327 ifc.ifc_len / sizeof(struct ifreq), ip_ntoa(ipaddr)));
1329 * Scan through looking for an interface with an Internet
1330 * address on the same subnet as `ipaddr'.
1332 ifend = ifs + (ifc.ifc_len / sizeof(struct ifreq));
1333 for (ifr = ifc.ifc_req; ifr < ifend; ifr++)
1335 if (ifr->ifr_addr.sa_family == AF_INET)
1337 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1338 strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1339 MAINDEBUG ((LOG_DEBUG, "proxy arp: examining interface %s",
1342 * Check that the interface is up, and not point-to-point
1345 if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
1350 if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0)
1355 * Get its netmask and check that it's on the right subnet.
1357 if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
1362 mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr;
1363 MAINDEBUG ((LOG_DEBUG, "proxy arp: interface addr %s mask %lx",
1364 ip_ntoa(ina), ntohl(mask)));
1366 if (((ipaddr ^ ina) & mask) != 0)
1379 syslog(LOG_INFO, "found interface %s for proxy arp", ifreq.ifr_name);
1381 * Now get the hardware address.
1383 memset (&ifreq.ifr_hwaddr, 0, sizeof (struct sockaddr));
1384 if (ioctl (sockfd, SIOCGIFHWADDR, &ifreq) < 0)
1386 syslog(LOG_ERR, "SIOCGIFHWADDR(%s): %m", ifreq.ifr_name);
1392 sizeof (struct sockaddr));
1394 MAINDEBUG ((LOG_DEBUG,
1395 "proxy arp: found hwaddr %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
1396 (int) ((unsigned char *) &hwaddr->sa_data)[0],
1397 (int) ((unsigned char *) &hwaddr->sa_data)[1],
1398 (int) ((unsigned char *) &hwaddr->sa_data)[2],
1399 (int) ((unsigned char *) &hwaddr->sa_data)[3],
1400 (int) ((unsigned char *) &hwaddr->sa_data)[4],
1401 (int) ((unsigned char *) &hwaddr->sa_data)[5],
1402 (int) ((unsigned char *) &hwaddr->sa_data)[6],
1403 (int) ((unsigned char *) &hwaddr->sa_data)[7]));
1408 * Return user specified netmask, modified by any mask we might determine
1409 * for address `addr' (in network byte order).
1410 * Here we scan through the system's list of interfaces, looking for
1411 * any non-point-to-point interfaces which might appear to be on the same
1412 * network as `addr'. If we find any, we OR in their netmask to the
1413 * user-specified netmask.
1416 u_int32_t GetMask (u_int32_t addr)
1418 u_int32_t mask, nmask, ina;
1419 struct ifreq *ifr, *ifend, ifreq;
1421 struct ifreq ifs[MAX_IFS];
1425 if (IN_CLASSA(addr)) /* determine network mask for address class */
1427 nmask = IN_CLASSA_NET;
1431 if (IN_CLASSB(addr))
1433 nmask = IN_CLASSB_NET;
1437 nmask = IN_CLASSC_NET;
1441 /* class D nets are disallowed by bad_ip_adrs */
1442 mask = netmask | htonl(nmask);
1444 * Scan through the system's network interfaces.
1446 ifc.ifc_len = sizeof(ifs);
1448 if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0)
1450 syslog(LOG_WARNING, "ioctl(SIOCGIFCONF): %m");
1454 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1455 for (ifr = ifc.ifc_req; ifr < ifend; ifr++)
1458 * Check the interface's internet address.
1460 if (ifr->ifr_addr.sa_family != AF_INET)
1464 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1465 if (((ntohl(ina) ^ addr) & nmask) != 0)
1470 * Check that the interface is up, and not point-to-point nor loopback.
1472 strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1473 if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
1478 if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0)
1483 * Get its netmask and OR it into our mask.
1485 if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
1489 mask |= ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr.s_addr;
1496 * Internal routine to decode the version.modification.patch level
1499 static void decode_version (char *buf, int *version,
1500 int *modification, int *patch)
1502 *version = (int) strtoul (buf, &buf, 10);
1509 *modification = (int) strtoul (buf, &buf, 10);
1513 *patch = (int) strtoul (buf, &buf, 10);
1526 * Procedure to determine if the PPP line dicipline is registered.
1530 ppp_registered(void)
1533 int ppp_disc = N_PPP;
1537 local_fd = open(devnam, O_NONBLOCK | O_RDWR, 0);
1540 syslog(LOG_ERR, "Failed to open %s: %m", devnam);
1544 initfdflags = fcntl(local_fd, F_GETFL);
1545 if (initfdflags == -1)
1547 syslog(LOG_ERR, "Couldn't get device fd flags: %m");
1552 initfdflags &= ~O_NONBLOCK;
1553 fcntl(local_fd, F_SETFL, initfdflags);
1555 * Read the initial line dicipline and try to put the device into the
1558 if (ioctl(local_fd, TIOCGETD, &init_disc) < 0)
1560 syslog(LOG_ERR, "ioctl(TIOCGETD): %m");
1565 if (ioctl(local_fd, TIOCSETD, &ppp_disc) < 0)
1567 syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
1572 if (ioctl(local_fd, TIOCSETD, &init_disc) < 0)
1574 syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
1584 * ppp_available - check whether the system has any ppp interfaces
1585 * (in fact we check whether we can do an ioctl on ppp0).
1588 int ppp_available(void)
1592 char abBuffer [1024];
1594 int my_version, my_modification, my_patch;
1596 * Open a socket for doing the ioctl operations.
1598 s = socket(AF_INET, SOCK_DGRAM, 0);
1604 strncpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
1605 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
1607 * If the device did not exist then attempt to create one by putting the
1608 * current tty into the PPP discipline. If this works then obtain the
1609 * flags for the device again.
1613 if (ppp_registered())
1615 strncpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
1616 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
1620 * Ensure that the hardware address is for PPP and not something else
1624 ok = ioctl (s, SIOCGIFHWADDR, (caddr_t) &ifr) >= 0;
1627 if (ok && ((ifr.ifr_hwaddr.sa_family & ~0xFF) != ARPHRD_PPP))
1637 * This is the PPP device. Validate the version of the driver at this
1638 * point to ensure that this program will work with the driver.
1640 ifr.ifr_data = abBuffer;
1641 size = ioctl (s, SIOCGPPPVER, (caddr_t) &ifr);
1646 decode_version (abBuffer,
1648 &driver_modification,
1655 driver_modification =
1659 * Validate the version of the driver against the version that we used.
1661 decode_version (PPP_VERSION,
1666 /* The version numbers must match */
1667 if (driver_version != my_version)
1672 /* The modification levels must be legal */
1673 if (driver_modification < my_modification)
1680 fprintf(stderr, "Sorry - PPP driver version %d.%d.%d is out of date\n",
1681 driver_version, driver_modification, driver_patch);
1691 * Update the wtmp file with the appropriate user name and tty device.
1694 int logwtmp (char *line, char *name, char *host)
1699 * Control the 'mesg' function based upon the state of the logon
1702 mode = (*name != '\0') ? 0600 : 0622;
1703 if (chmod (devnam, mode) < 0)
1705 syslog (LOG_ERR, "chmod(\"%s\", 0%o): %m", devnam, mode);
1708 * Update the signon database for users.
1710 memset (&ut, 0, sizeof (ut));
1711 (void)strncpy(ut.ut_line, line, sizeof(ut.ut_line));
1712 (void)strncpy(ut.ut_name, name, sizeof(ut.ut_name));
1713 (void)strncpy(ut.ut_host, host, sizeof(ut.ut_host));
1714 (void)time(&ut.ut_time);
1716 pututline (&ut); /* Write the line to the proper place */
1717 endutent(); /* Indicate operation is complete */
1721 * Code for locking/unlocking the serial device.
1722 * This code is derived from chat.c.
1725 #define LOCK_PREFIX "/var/lock/LCK.."
1728 * lock - create a lock file for the named device
1731 int lock (char *dev)
1733 char hdb_lock_buffer[12];
1737 p = strrchr(dev, '/');
1743 lock_file = malloc(strlen(LOCK_PREFIX) + strlen(dev) + 1);
1744 if (lock_file == NULL)
1746 novm("lock file name");
1749 strcpy (lock_file, LOCK_PREFIX);
1750 strcat (lock_file, dev);
1752 * Attempt to create the lock file at this point.
1756 fd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644);
1759 sprintf(hdb_lock_buffer, "%010d\n", getpid());
1760 write(fd, hdb_lock_buffer, 11);
1765 * If the file exists then check to see if the pid is stale
1767 if (errno == EEXIST)
1769 fd = open(lock_file, O_RDONLY, 0);
1772 if (errno == ENOENT) /* This is just a timing problem. */
1779 /* Read the lock file to find out who has the device locked */
1780 n = read (fd, hdb_lock_buffer, 11);
1784 syslog(LOG_ERR, "Can't read pid from lock file %s", lock_file);
1788 /* See the process still exists. */
1791 hdb_lock_buffer[n] = '\0';
1792 sscanf (hdb_lock_buffer, " %d", &pid);
1793 if (kill(pid, 0) == -1 && errno == ESRCH)
1799 /* If the process does not exist then try to remove the lock */
1800 if (n == 0 && unlink (lock_file) == 0)
1802 syslog (LOG_NOTICE, "Removed stale lock on %s (pid %d)",
1807 syslog (LOG_NOTICE, "Device %s is locked by pid %d", dev, pid);
1811 syslog(LOG_ERR, "Can't create lock file %s: %m", lock_file);
1821 * unlock - remove our lockfile