/* * sys-linux.c - System-dependent procedures for setting up * PPP interfaces on Linux systems * * Fairly patched version for isdn4linux * copyright (c) 1995,1996,1997 of all patches by Michael Hipp * still no warranties (see disclaimer) * * Copyright (c) 1989 Carnegie Mellon University. * All rights reserved. * * Redistribution and use in source and binary forms are permitted * provided that the above copyright notice and this paragraph are * duplicated in all such forms and that any documentation, * advertising materials, and other materials related to such * distribution and use acknowledge that the software was developed * by Carnegie Mellon University. The name of the * University may not be used to endorse or promote products derived * from this software without specific prior written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ char sys_rcsid[] = "$Id: sys-linux.c,v 1.12 1998/04/28 08:34:05 paul Exp $"; #define _LINUX_STRING_H_ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #if defined __GLIBC__ && __GLIBC__ >= 2 # include # include # include # include "route.h" #else # include # include # include #endif #include "fsm.h" #include "ipppd.h" #include "ipcp.h" #include "ipxcp.h" #include "ccp.h" #include "lcp.h" static int prev_kdebugflag = 0; static int has_default_route = 0; static int driver_version = 0; static int driver_modification = 0; static int driver_patch = 0; static int devroute = -1; /* 0 for Linux >= 2.1.x */ static int last_net_mask = 0; /* Ugly! */ int get_ether_addr (u_int32_t ipaddr, struct sockaddr *hwaddr, char *name); static void decode_version (char *buf, int *version, int *modification, int *patch); int sockfd; /* socket for doing interface ioctls */ static char *lock_file; #define MAX_IFS 5000 #define FLAGS_GOOD (IFF_UP | IFF_BROADCAST) #define FLAGS_MASK (IFF_UP | IFF_BROADCAST | \ IFF_POINTOPOINT | IFF_LOOPBACK | IFF_NOARP) /* * SET_SA_FAMILY - set the sa_family field of a struct sockaddr, * if it exists. */ #define SET_SA_FAMILY(addr, family) \ memset ((char *) &(addr), '\0', sizeof(addr)); \ addr.sa_family = (family); /* * Determine if the PPP connection should still be present. */ #define still_ppp(linkunit) (lns[linkunit].hungup == 0) /* * */ void enable_mp(int linkunit,int flags) { int mpflags,s; s = ioctl(lns[linkunit].fd,PPPIOCGMPFLAGS,(caddr_t) &mpflags); if(s < 0) syslog(LOG_ERR,"ipppd: Can't get MP-Flags"); else { mpflags |= SC_MP_PROT; mpflags &= ~SC_REJ_MP_PROT; mpflags |= flags; s = ioctl(lns[linkunit].fd,PPPIOCSMPFLAGS,(caddr_t) &mpflags); if(s < 0) syslog(LOG_ERR,"ipppd: Can't set MP-Flags"); } } /* * Functions to read and set the flags value in the device driver */ static int get_flags (int tu,int *error) { int flags; *error = 0; if(lns[tu].fd < 0) { *error = 1; return 0; } if (ioctl(lns[tu].fd, PPPIOCGFLAGS, (caddr_t) &flags) < 0) { syslog(LOG_ERR, "ioctl(PPPIOCGFLAGS): %m"); *error = 1; return 0; } MAINDEBUG ((LOG_DEBUG, "get flags = %x\n", flags)); return flags; } static void set_flags (int flags,int tu) { MAINDEBUG ((LOG_DEBUG, "set flags = %x\n", flags)); if(lns[tu].fd < 0) return; if (ioctl(lns[tu].fd, PPPIOCSFLAGS, (caddr_t) &flags) < 0) { syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS, %x): %m", flags); } } /* * sys_init - System-dependent initialization. */ void sys_init(void) { struct utsname uts; int maj, min, pat; openlog("ipppd", 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 ioctls. */ sockfd = socket(AF_INET, SOCK_DGRAM, 0); if (sockfd < 0) { syslog(LOG_ERR, "Couldn't create IP socket: %m"); die(1); } if (devroute < 0) { uname(&uts); maj = min = pat = 0; decode_version(uts.release, &maj, &min, &pat); if (maj >= 2 && min >= 1) /* Linux >= 2.1.x */ devroute = 0; else devroute = 1; } } /* * note_debug_level - note a change in the debug level. */ void note_debug_level (void) { if (debug) { MAINDEBUG ((LOG_INFO, "Debug turned ON, Level %d", debug)); setlogmask(LOG_UPTO(LOG_DEBUG)); } else setlogmask(LOG_UPTO(LOG_WARNING)); } /* * set_kdebugflag - Define the debugging level for the kernel */ int set_kdebugflag (int requested_level,int tu) { if (ioctl(lns[tu].fd, PPPIOCGDEBUG, &prev_kdebugflag) < 0) { syslog(LOG_ERR, "ioctl(PPPIOCGDEBUG): %m"); return 0; } if (prev_kdebugflag != requested_level) { if (ioctl(lns[tu].fd, PPPIOCSDEBUG, &requested_level) < 0) { syslog (LOG_ERR, "ioctl(PPPIOCSDEBUG): %m"); return 0; } MAINDEBUG ((LOG_INFO, "set kernel debugging level to %d", requested_level)); } return 1; } /* * establish_ppp - get UNIT, callinfo, IF-MTU */ void establish_ppp (int linkunit) { if (ioctl(lns[linkunit].fd, PPPIOCGUNIT, &lns[linkunit].ifunit) < 0) { syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m"); lns[linkunit].ifunit = -1; return; } lns[linkunit].master = -1; sprintf(lns[linkunit].ifname,"%s%d","ippp",lns[linkunit].ifunit); if( ioctl(lns[linkunit].fd, PPPIOCGCALLINFO, &lns[linkunit].pci) == 0) { struct pppcallinfo *pci = &lns[linkunit].pci; syslog(LOG_NOTICE, "Local number: %s, Remote number: %s, Type: %s", pci->local_num,pci->remote_num,pci->calltype & CALLTYPE_INCOMING ? "incoming" : "outgoing" ); } if(useifmtu) { struct ifreq ifr; memset (&ifr, '\0', sizeof (ifr)); strncpy(ifr.ifr_name, lns[linkunit].ifname, sizeof (ifr.ifr_name)); if (ioctl(sockfd, SIOCGIFMTU, (caddr_t) &ifr) < 0) syslog(LOG_NOTICE , "Can't get MTU from device %s",lns[linkunit].ifname); else lcp_allowoptions[lns[linkunit].lcp_unit].mru = ifr.ifr_mtu; } #if 0 set_kdebugflag (kdebugflag,linkunit); #endif MAINDEBUG ((LOG_NOTICE, "Using version %d.%d.%d of PPP driver", driver_version, driver_modification, driver_patch)); } /* * output - Output PPP packet. */ void output_ppp (int linkunit, unsigned char *p, int len) { if (debug) log_packet(p, len, "sent ",linkunit); if (write(lns[linkunit].fd, p, len) < 0) { syslog(LOG_ERR, "write, unit: %d fd: %d: %m",linkunit,lns[linkunit].fd); die(1); } } /* * read_packet - get a PPP packet from the serial device. */ int read_packet (unsigned char *buf,int linkunit) { int len; len = read(lns[linkunit].fd, buf, PPP_MTU + PPP_HDRLEN); if (len < 0) { if (errno == EWOULDBLOCK) return -1; syslog(LOG_ERR, "read(fd): %m"); die(1); } return len; } /* * 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; int err; MAINDEBUG ((LOG_DEBUG, "send_config: mtu = %d\n", mtu)); /* * Ensure that the link is still up. */ if (still_ppp(unit)) { /* * Set the MTU and other parameters for the ppp device */ if(lns[unit].master < 0) { memset (&ifr, '\0', sizeof (ifr)); strncpy(ifr.ifr_name, lns[unit].ifname, sizeof (ifr.ifr_name)); ifr.ifr_mtu = mtu; if (ioctl(sockfd, SIOCSIFMTU, (caddr_t) &ifr) < 0) { syslog(LOG_ERR, "ioctl(SIOCSIFMTU): %m, %d %s %d.",sockfd,ifr.ifr_name,ifr.ifr_mtu); } } x = get_flags(unit,&err); if(err) return; x = pcomp ? x | SC_COMP_PROT : x & ~SC_COMP_PROT; x = accomp ? x | SC_COMP_AC : x & ~SC_COMP_AC; set_flags(x,unit); } } /* * ppp_mp_send_config, ppp_mp_recv_config */ void ppp_mp_send_config(int unit,int mtu) { int r; r = ioctl(lns[unit].fd,PPPIOCSMPMTU,&mtu); syslog(LOG_DEBUG,"mp_mtu: %d",r); } void ppp_mp_recv_config(int unit,int mru) { int r; r = ioctl(lns[unit].fd,PPPIOCSMPMRU,&mru); syslog(LOG_DEBUG,"mp_mru: %d",r); } /* * ppp_set_xaccm - set the extended transmit ACCM for the interface. */ void ppp_set_xaccm (int unit, ext_accm accm) { #if 0 MAINDEBUG ((LOG_DEBUG, "set_xaccm: %08lx %08lx %08lx %08lx\n", accm[0], accm[1], accm[2], accm[3])); if (ioctl(lns[unit].fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY) syslog(LOG_WARNING, "ioctl(set extended ACCM): %m"); #endif } /* * 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; int err; /* * 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(unit)) return; /* * Set the receiver parameters */ if (ioctl(lns[unit].fd, PPPIOCSMRU, (caddr_t) &mru) < 0) syslog(LOG_ERR, "ioctl(PPPIOCSMRU): %m"); x = get_flags(unit,&err); if(err) return; x = accomp ? x & ~SC_REJ_COMP_AC : x | SC_REJ_COMP_AC; set_flags (x,unit); } /* * ccp_test - ask kernel whether a given compression method * is acceptable for use. */ int ccp_test (int ccp_unit, u_char *opt_ptr, int opt_len, int for_transmit) { struct isdn_ppp_comp_data data; int linkunit = ccp_fsm[ccp_unit].unit; memset (&data, '\0', sizeof (data)); data.num = opt_ptr[0]; data.optlen = opt_len - 2; if(data.optlen > ISDN_PPP_COMP_MAX_OPTIONS) { syslog(LOG_NOTICE, "ccp_test: options field too long!\n"); return -1; } memcpy(data.options,opt_ptr+2,data.optlen); data.flags = 0; if(for_transmit) data.flags |= IPPP_COMP_FLAG_XMIT; if(ccp_fsm[ccp_unit].protocol == PPP_LINK_CCP) data.flags |= IPPP_COMP_FLAG_LINK; if (ioctl(lns[linkunit].fd, PPPIOCSCOMPRESSOR, (caddr_t) &data) >= 0) return 1; return (errno == ENOBUFS)? 0: -1; } int ccp_get_compressors(int ccp_unit,unsigned long *protos) { int linkunit = ccp_fsm[ccp_unit].unit; if (ioctl(lns[linkunit].fd, PPPIOCGCOMPRESSORS, protos) >= 0) return 0; return -1; } /* * ccp_flags_set - inform kernel about the current state of CCP. */ void ccp_flags_set (int ccp_unit, int isopen, int isup) { int linkunit = ccp_fsm[ccp_unit].unit; int err; if (still_ppp(linkunit)) { int x = get_flags(linkunit,&err); if(err) return; x = isopen? x | SC_CCP_OPEN : x &~ SC_CCP_OPEN; x = isup? x | SC_CCP_UP : x &~ SC_CCP_UP; set_flags (x,linkunit); } } /* * 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 ccp_unit) { int linkunit = ccp_fsm[ccp_unit].unit; int err; int x = get_flags(linkunit,&err); if(err) return 0; return x & SC_DC_FERROR; } /* * sifvjcomp - config tcp header compression */ int sifvjcomp (int unit, int vjcomp, int cidcomp, int maxcid) { int err; u_int x = get_flags(unit,&err); if(err) return 0; if (vjcomp) { if (ioctl (lns[unit].fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) { syslog (LOG_ERR, "ioctl(PPPIOCSFLAGS): %m"); 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,unit); return 1; } /* * sifup - Config the interface up and enable IP packets to pass. */ int sifup (int u) { struct ifreq ifr; u_int x; memset (&ifr, '\0', sizeof (ifr)); strncpy(ifr.ifr_name, lns[u].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 | IFF_POINTOPOINT); if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) { syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m"); return 0; } if( ioctl(lns[u].fd,PPPIOCGFLAGS,(caddr_t) &x) < 0) { syslog(LOG_ERR,"ioctl(PPPIOCGFLAGS): %m"); return 0; } x |= SC_ENABLE_IP; if( ioctl(lns[u].fd,PPPIOCSFLAGS,(caddr_t) &x) < 0) { syslog(LOG_ERR,"ioctl(PPPIOCSFLAGS): %m"); return 0; } return 1; } /* * sifdown - Config the interface down and disable IP. */ int sifdown (int u) { struct ifreq ifr; memset (&ifr, '\0', sizeof (ifr)); strncpy(ifr.ifr_name, lns[u].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; } /* * sifbundle */ int sifbundle (int linkunit0,int linkunit1) { return ioctl(lns[linkunit0].fd, PPPIOCBUNDLE, &lns[linkunit1].ifunit ); } /* * sifaddr - Config the interface IP addresses and netmask. */ int sifaddr (int unit, int our_adr, int his_adr, int 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); strncpy (ifr.ifr_name, lns[unit].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); } } last_net_mask = net_mask; /* * Add the device route */ if (!devroute) return 1; if (hostroute) { SET_SA_FAMILY (rt.rt_dst, AF_INET); SET_SA_FAMILY (rt.rt_gateway, AF_INET); SET_SA_FAMILY (rt.rt_genmask, AF_INET); rt.rt_dev = lns[unit].ifname; /* MJC */ if (net_mask) his_adr &= net_mask; ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = 0L; ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = his_adr; ((struct sockaddr_in *) &rt.rt_genmask)->sin_addr.s_addr = net_mask; rt.rt_flags = RTF_UP; if (net_mask == 0) rt.rt_flags |= RTF_HOST; if (ioctl(sockfd, SIOCADDRT, &rt) < 0) { syslog (LOG_ERR, "ioctl(SIOCADDRT) device route (%s/%s/%08x): %m", rt.rt_dev, inet_ntoa(((struct sockaddr_in *)&rt.rt_dst)->sin_addr), ntohl(net_mask)); return (0); } } return 1; } /* * cifaddr - Clear the interface IP addresses, and delete routes * through the interface if possible. */ int cifaddr (int unit, int our_adr, int his_adr) { struct rtentry rt; /* * Delete the route through the device */ if (!devroute) return 1; memset (&rt, '\0', sizeof (rt)); SET_SA_FAMILY (rt.rt_dst, AF_INET); SET_SA_FAMILY (rt.rt_gateway, AF_INET); SET_SA_FAMILY (rt.rt_genmask, AF_INET); rt.rt_dev = lns[unit].ifname; /* MJC */ if (last_net_mask) his_adr &= last_net_mask; ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = 0; ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = his_adr; ((struct sockaddr_in *) &rt.rt_genmask)->sin_addr.s_addr = last_net_mask; rt.rt_flags = RTF_UP; if (last_net_mask == 0) rt.rt_flags |= RTF_HOST; if (ioctl(sockfd, SIOCDELRT, &rt) < 0 && errno != ESRCH) { if (still_ppp(unit)) { syslog (LOG_ERR, "ioctl(SIOCDELRT) device route: %m"); return (0); } } return 1; } /* * path_to_proc - determine the path to the proc file system data */ FILE *route_fd = (FILE *) 0; static char route_buffer [512]; static char *path_to_proc (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_proc - find the path to the route tables in the proc file system */ static char *path_to_proc (void) { struct mntent *mntent; FILE *fp; fp = fopen (MOUNTED, "r"); if (fp != 0) { mntent = getmntent (fp); while (mntent != (struct mntent *) 0) { if (strcmp (mntent->mnt_type, MNTTYPE_IGNORE) != 0) { if (strcmp (mntent->mnt_type, "proc") == 0) { strncpy (route_buffer, mntent->mnt_dir, sizeof (route_buffer)-10); route_buffer [sizeof (route_buffer)-10] = '\0'; fclose (fp); return (route_buffer); } } mntent = getmntent (fp); } 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 int open_route_table (void) { char *path; close_route_table(); path = path_to_proc(); if (path == NULL) { return 0; } strcat (path, "/net/route"); route_fd = fopen (path, "r"); if (route_fd == (FILE *) 0) { syslog (LOG_ERR, "can not open %s: %m", path); return 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, *dst_ptr, *gw_ptr, *flag_ptr; memset (rt, '\0', sizeof (struct rtentry)); for (;;) { if (fgets (route_buffer, sizeof (route_buffer), route_fd) == (char *) 0) { 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 */ if (flag_ptr == (char *) 0) /* assume that we failed, somewhere. */ { return 0; } /* Discard that stupid header line which should never * have been there in the first place !! */ if (isxdigit (*dst_ptr) && isxdigit (*gw_ptr) && isxdigit (*flag_ptr)) { break; } } ((struct sockaddr_in *) &rt->rt_dst)->sin_addr.s_addr = strtoul (dst_ptr, NULL, 16); ((struct sockaddr_in *) &rt->rt_gateway)->sin_addr.s_addr = strtoul (gw_ptr, NULL, 16); rt->rt_flags = (short) strtoul (flag_ptr, NULL, 16); rt->rt_dev = dev_ptr; return 1; } /* * defaultroute_exists - determine if there is a default route */ static int defaultroute_exists (void) { struct rtentry rt; int result = 0; if (!open_route_table()) { return 0; } while (read_route_table(&rt) != 0) { if ((rt.rt_flags & RTF_UP) == 0) { continue; } if (((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr == 0L) { struct in_addr ina; ina.s_addr = ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr; syslog (LOG_ERR, "ppp not replacing existing default route to %s[%s]", rt.rt_dev, inet_ntoa (ina) ); result = 1; break; } } close_route_table(); return result; } /* * sifdefaultroute - assign a default route through the address given. */ int sifdefaultroute (int unit, int gateway) { struct rtentry rt; if (has_default_route == 0) { if (defaultroute_exists()) return 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, SIOCADDRT, &rt) < 0) { syslog (LOG_ERR, "default route ioctl(SIOCADDRT): %m"); return 0; } } has_default_route = 1; return 1; } /* * cifdefaultroute - delete a default route through the address given. */ int cifdefaultroute (int unit, int gateway) { struct rtentry rt; if (has_default_route) { 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 && errno != ESRCH) { if (still_ppp(unit)) { syslog (LOG_ERR, "default route ioctl(SIOCDELRT): %m"); return 0; } } } has_default_route = 0; return 1; } /* * sifproxyarp - Make a proxy ARP entry for the peer. */ int sifproxyarp (int linkunit, u_int32_t his_adr) { struct arpreq arpreq; if (lns[linkunit].has_proxy_arp == 0) { memset (&arpreq, '\0', sizeof(arpreq)); /* * Get the hardware address of an interface on the same subnet * as our local address. */ if (!get_ether_addr(his_adr, &arpreq.arp_ha, arpreq.arp_dev)) { 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; } } lns[linkunit].has_proxy_arp = 1; return 1; } /* * cifproxyarp - Delete the proxy ARP entry for the peer. */ int cifproxyarp (int linkunit, u_int32_t his_adr) { struct arpreq arpreq; if (lns[linkunit].has_proxy_arp == 1) { memset (&arpreq, '\0', sizeof(arpreq)); SET_SA_FAMILY(arpreq.arp_pa, AF_INET); arpreq.arp_flags = ATF_PERM | ATF_PUBL; ((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; } } lns[linkunit].has_proxy_arp = 0; return 1; } /* * get_ether_addr - get the hardware address of an interface on the * the same subnet as ipaddr. */ static int local_get_ether_addr (u_int32_t ipaddr, struct sockaddr *hwaddr, char *name, struct ifreq *ifs, int ifs_len) { struct ifreq *ifr, *ifend; u_int32_t ina, mask; struct ifreq ifreq; struct ifconf ifc; /* * Request the total list of all devices configured on your system. */ ifc.ifc_len = ifs_len; ifc.ifc_req = ifs; if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) { syslog(LOG_ERR, "ioctl(SIOCGIFCONF): %m"); return 0; } MAINDEBUG ((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) { 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", ifreq.ifr_name)); /* * Check that the interface is up, and not point-to-point * nor loopback. */ if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0) continue; 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) continue; mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr; MAINDEBUG ((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; memcpy (name, ifreq.ifr_name, sizeof(ifreq.ifr_name)); syslog(LOG_INFO, "found interface %s for proxy arp", name); /* * Now get the hardware address. */ memset (&ifreq.ifr_hwaddr, 0, sizeof (struct sockaddr)); if (ioctl (sockfd, SIOCGIFHWADDR, &ifreq) < 0) { syslog(LOG_ERR, "SIOCGIFHWADDR(%s): %m", ifreq.ifr_name); return 0; } memcpy (hwaddr, &ifreq.ifr_hwaddr, sizeof (struct sockaddr)); MAINDEBUG ((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)[6], (int) ((unsigned char *) &hwaddr->sa_data)[7])); return 1; } int get_ether_addr (u_int32_t ipaddr, struct sockaddr *hwaddr, char *name) { int ifs_len; int answer; void *base_addr; /* * Allocate memory to hold the request. */ ifs_len = MAX_IFS * sizeof (struct ifreq); base_addr = (void *) malloc (ifs_len); if (!base_addr) { syslog(LOG_ERR, "malloc(%d) failed to return memory", ifs_len); return 0; } /* * Find the hardware address associated with the controller */ answer = local_get_ether_addr (ipaddr, hwaddr, name, (struct ifreq *) base_addr, ifs_len); free (base_addr); return answer; } /* * Return user specified netmask, modified by any mask we might determine * for address `addr' (in network byte order). * Here we scan through the system's list of interfaces, looking for * any non-point-to-point interfaces which might appear to be on the same * network as `addr'. If we find any, we OR in their netmask to the * user-specified netmask. * * If our address happens to be in the same network/subnet as one of * the other interfaces, set the netmask to 255.255.255.255 * * FIXME: This stuff is OLD and should be rewritten (we now use CIDR remember). */ static u_int32_t local_GetMask (u_int32_t addr, struct ifreq *ifs, int ifs_len) { u_int32_t mask, nmask, ina; struct ifreq *ifr, *ifend, ifreq; struct ifconf ifc; ina = ntohl(addr); if (IN_CLASSA(ina)) { /* determine network mask for address class */ nmask = IN_CLASSA_NET; } else { if (IN_CLASSB(ina)) { nmask = IN_CLASSB_NET; } else { nmask = IN_CLASSC_NET; } } nmask = htonl(nmask); /* class D nets are disallowed by bad_ip_adrs */ mask = netmask | nmask; if (ifs == (void *) 0) { return mask; } /* * Scan through the system's network interfaces. */ ifc.ifc_len = ifs_len; ifc.ifc_req = ifs; if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) { syslog(LOG_WARNING, "ioctl(SIOCGIFCONF): %m"); return mask; } ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len); for (ifr = ifc.ifc_req; ifr < ifend; ifr++) { if (ifr->ifr_addr.sa_family != AF_INET) { continue; } /* * Check that the interface is up, and not point-to-point nor loopback. */ strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name)); if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0) continue; if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0) continue; /* * See if our IP address is part of this subnet. */ ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr; if (ina == addr) continue; if ((ina & nmask) == (addr & nmask)) { mask = 0xFFFFFFFF; break; } /* * Check the interface's internet address. */ if (((ina ^ addr) & nmask) != 0) continue; /* * Get its netmask and OR it into our mask. */ if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0) continue; mask |= ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr.s_addr; break; } return mask; } u_int32_t GetMask (u_int32_t addr) { int ifs_len; u_int32_t answer; void *base_addr; /* * If user set netmask assume he knows what he's doing. */ if (netmask) return netmask; /* * Allocate memory to hold the request. */ ifs_len = MAX_IFS * sizeof (struct ifreq); base_addr = (void *) malloc (ifs_len); if (base_addr == (void *) 0) { syslog(LOG_ERR, "malloc(%d) failed to return memory", ifs_len); } /* * Find the netmask used on the same network. */ answer = local_GetMask (addr, (struct ifreq *) base_addr, ifs_len); if (base_addr != (void *) 0) { free (base_addr); } return answer; } /* * 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 == '.') { ++buf; *modification = (int) strtoul (buf, &buf, 10); if (*buf == '.') { ++buf; *patch = (int) strtoul (buf, &buf, 10); } } if (*buf != '\0') { *version = *modification = *patch = 0; } } /* * 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; struct ifreq ifr; char abBuffer [1024]; int my_version, my_modification, my_patch; /* * Open a socket for doing the ioctl operations. */ if( (s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) return 0; strncpy (ifr.ifr_name, "ippp0", sizeof (ifr.ifr_name)); if(ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) return 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. */ ifr.ifr_data = abBuffer; if (ioctl (s, SIOCGPPPVER, (caddr_t) &ifr) >= 0) decode_version (abBuffer, &driver_version, &driver_modification, &driver_patch); else driver_version = driver_modification = driver_patch = 0; close(s); /* * 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 and the modification levels must be legal */ if (driver_version != my_version || driver_modification < my_modification) { extern char *no_ppp_msg; no_ppp_msg = route_buffer; sprintf(no_ppp_msg, "Sorry - PPP driver version %d.%d.%d is out of date.\n" "Maybe ippp0 has no 'syncppp' encapsulation?\n", driver_version, driver_modification, driver_patch); return 0; } return 1; } /* * Update the wtmp file with the appropriate user name and tty device. */ int logwtmputmp (int unit,char *line, char *name, char *host) { struct utmp ut, *utp; pid_t mypid = getpid(); /* * Update the signon database for users. * Christoph Lameter: Copied from poeigl-1.36 Jan 3, 1996 */ utmpname(_PATH_UTMP); setutent(); while( (utp = getutent()) && (utp->ut_pid != mypid) ) ; /* * 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)); strncpy(ut.ut_user, name, sizeof(ut.ut_user)); strncpy(ut.ut_line, line, sizeof(ut.ut_line)); ut.ut_time = time((void *)0); 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_hisoptions[unit].neg_addr) memcpy (&ut.ut_addr, (char *) &ipcp_hisoptions[unit].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. */ #if (defined __GLIBC__ && __GLIBC__ >= 2) updwtmp (_PATH_WTMP, &ut); #else { int 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); } } #endif return 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 /* * lock - create a lock file for the named device */ int lock (char *dev) { char hdb_lock_buffer[12]; int lfd, pid, n; char *p; p = strrchr(dev, '/'); if (p != NULL) { dev = ++p; } lock_file = malloc(strlen(LOCK_PREFIX) + strlen(dev) + 1); if (lock_file == NULL) { novm("lock file name"); } strcpy (lock_file, LOCK_PREFIX); strcat (lock_file, dev); /* * Attempt to create the lock file at this point. */ while (1) { lfd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644); if (lfd >= 0) { pid = getpid(); #ifndef PID_BINARY sprintf (hdb_lock_buffer, "%010d\n", pid); write (lfd, hdb_lock_buffer, 11); #else write(lfd, &pid, sizeof (pid)); #endif close(lfd); return 0; } /* * If the file exists then check to see if the pid is stale */ if (errno == EEXIST) { lfd = open(lock_file, O_RDONLY, 0); if (lfd < 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 (lfd, hdb_lock_buffer, 11); close (lfd); if (n < 0) { syslog(LOG_ERR, "Can't read pid from lock file %s", lock_file); break; } /* See the process still exists. */ if (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 || (kill(pid, 0) == -1 && errno == ESRCH)) { n = 0; } } /* If the process does not exist then try to remove the lock */ if (n == 0 && unlink (lock_file) == 0) { syslog (LOG_NOTICE, "Removed stale lock on %s (pid %d)", dev, pid); continue; } syslog (LOG_NOTICE, "Device %s is locked by pid %d", dev, pid); break; } syslog(LOG_ERR, "Can't create lock file %s: %m", lock_file); break; } free(lock_file); lock_file = NULL; return -1; } /* * unlock - remove our lockfile */ void unlock(void) { if (lock_file) { unlink(lock_file); free(lock_file); lock_file = NULL; } } void setifip(int ipcp_unit) { u_int32_t ouraddr,hisaddr; struct ifreq ifr; extern ipcp_options ipcp_wantoptions[NUM_PPP]; ipcp_options *wo = &ipcp_wantoptions[ipcp_unit]; memset (&ifr, '\0', sizeof (ifr)); strncpy(ifr.ifr_name,lns[ipcp_fsm[ipcp_unit].unit].ifname,sizeof(ifr.ifr_name)); if(ioctl(sockfd,SIOCGIFADDR,(caddr_t) &ifr) < 0) { syslog(LOG_ERR,"ioctl(SIOCGIFADDR): %m"); return; } ouraddr = ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr; if(debug) syslog (LOG_DEBUG, "got if-src: %08lx\n",(unsigned long) ouraddr); if(ouraddr) wo->ouraddr = ouraddr; if(ioctl(sockfd,SIOCGIFDSTADDR,(caddr_t) &ifr) < 0) { syslog(LOG_ERR,"ioctl(SIOCGIFDSTADDR): %m"); return; } hisaddr = ((struct sockaddr_in *) &ifr.ifr_dstaddr)->sin_addr.s_addr; if(debug) syslog (LOG_DEBUG, "got if-dst: %08lx\n",(unsigned long) hisaddr); if(hisaddr) wo->hisaddr = hisaddr; } /************************ IPX SUPPORT *********************************/ #if defined(__GLIBC__) && (__GLIBC__ > 1) /* includes , which breaks glibc 2.x support. Prevent that... */ # define _LINUX_SOCKET_H #endif #include /* * sipxfaddr - Config the interface IPX networknumber */ int sipxfaddr (int unit, u_int32_t network, unsigned char * node ) { int skfd; int result = 1; /* struct sockaddr_ipx ipx_addr; */ struct ifreq ifr; struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr; skfd = socket (AF_IPX, SOCK_DGRAM, 0); if (skfd < 0) { syslog (LOG_DEBUG, "socket(AF_IPX): %m"); result = 0; } else { memset (&ifr, '\0', sizeof (ifr)); strcpy (ifr.ifr_name, lns[unit].ifname); 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) { syslog (LOG_DEBUG, "ioctl(SIOCAIFADDR, CRTITF): %m"); } else { syslog (LOG_WARNING, "ioctl(SIOCAIFADDR, CRTITF): Address already exists"); } } close (skfd); } 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 linkunit) { int skfd; int result = 1; /* struct sockaddr_ipx ipx_addr; */ struct ifreq ifr; struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr; skfd = socket (AF_IPX, SOCK_DGRAM, 0); if (skfd < 0) { syslog (LOG_DEBUG, "socket(AF_IPX): %m"); result = 0; } else { memset (&ifr, '\0', sizeof (ifr)); strcpy (ifr.ifr_name, lns[linkunit].ifname); 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) { syslog (LOG_INFO, "ioctl(SIOCAIFADDR, IPX_DLTITF) %d: %m", errno); result = 0; } close (skfd); } return result; } /* * Turn off any option which is not supported by this implementation. * * This procedure is called after all of the options have been processed. * It gives the implementation a chance to alter the configurtion options * based upon the current support by the operating system. */ void remove_sys_options(void) { 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) { char *path = path_to_proc(); if (path != NULL) { strcat (path, "/net/ipx_interface"); if (lstat (path, &stat_buf) >= 0) break; } syslog (LOG_ERR, "IPX support is not present in the kernel\n"); ipxcp_protent.enabled_flag = 0; ipcp_protent.enabled_flag = 1; break; } }