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5106c67149
Stay as the invoking uid as much as possible. Execution as a normal user is still forbidden for now, so these changes are pretty ineffective. The next commit will implement the modifications suggested on -hackers a number of days ago.
396 lines
9.8 KiB
C
396 lines
9.8 KiB
C
/*
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* PPP OS Layer Interface Module
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*
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* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
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*
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* Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the Internet Initiative Japan, Inc. The name of the
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* IIJ may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* $Id: os.c,v 1.30 1997/11/08 00:28:10 brian Exp $
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*
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*/
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/select.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/if_tun.h>
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#include <net/route.h>
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#include <arpa/inet.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <termios.h>
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#include <unistd.h>
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#include "mbuf.h"
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#include "log.h"
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#include "id.h"
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#include "defs.h"
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#include "timer.h"
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#include "fsm.h"
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#include "ipcp.h"
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#include "os.h"
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#include "loadalias.h"
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#include "command.h"
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#include "vars.h"
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#include "arp.h"
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#include "systems.h"
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#include "route.h"
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#include "ccp.h"
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#include "modem.h"
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char *IfDevName;
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static struct ifaliasreq ifra;
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static struct ifreq ifrq;
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static struct in_addr oldmine, oldhis;
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static int linkup;
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static int
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SetIpDevice(struct in_addr myaddr,
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struct in_addr hisaddr,
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struct in_addr netmask,
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int updown)
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{
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struct sockaddr_in *sock_in;
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int s;
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int changeaddr = 0;
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u_long mask, addr;
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s = ID0socket(AF_INET, SOCK_DGRAM, 0);
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if (s < 0) {
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LogPrintf(LogERROR, "SetIpDevice: socket(): %s\n", strerror(errno));
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return (-1);
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}
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if (updown == 0) {
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if (Enabled(ConfProxy))
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cifproxyarp(s, oldhis.s_addr);
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if (oldmine.s_addr == 0 && oldhis.s_addr == 0) {
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close(s);
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return (0);
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}
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memset(&ifra.ifra_addr, '\0', sizeof(ifra.ifra_addr));
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memset(&ifra.ifra_broadaddr, '\0', sizeof(ifra.ifra_addr));
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memset(&ifra.ifra_mask, '\0', sizeof(ifra.ifra_addr));
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if (ID0ioctl(s, SIOCDIFADDR, &ifra) < 0) {
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LogPrintf(LogERROR, "SetIpDevice: ioctl(SIOCDIFADDR): %s\n",
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strerror(errno));
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close(s);
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return (-1);
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}
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oldmine.s_addr = oldhis.s_addr = 0;
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} else {
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/*
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* If given addresses are alreay set, then ignore this request.
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*/
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if (oldmine.s_addr == myaddr.s_addr && oldhis.s_addr == hisaddr.s_addr) {
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close(s);
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return (0);
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}
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/*
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* If different address has been set, then delete it first.
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*/
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if (oldmine.s_addr || oldhis.s_addr) {
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changeaddr = 1;
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}
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/*
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* Set interface address
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*/
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sock_in = (struct sockaddr_in *) & (ifra.ifra_addr);
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sock_in->sin_family = AF_INET;
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sock_in->sin_addr = oldmine = myaddr;
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sock_in->sin_len = sizeof(*sock_in);
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/*
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* Set destination address
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*/
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sock_in = (struct sockaddr_in *) & (ifra.ifra_broadaddr);
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sock_in->sin_family = AF_INET;
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sock_in->sin_addr = oldhis = hisaddr;
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sock_in->sin_len = sizeof(*sock_in);
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/*
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* */
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addr = ntohl(myaddr.s_addr);
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if (IN_CLASSA(addr))
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mask = IN_CLASSA_NET;
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else if (IN_CLASSB(addr))
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mask = IN_CLASSB_NET;
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else
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mask = IN_CLASSC_NET;
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/*
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* if subnet mask is given, use it instead of class mask.
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*/
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if (netmask.s_addr && (ntohl(netmask.s_addr) & mask) == mask)
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mask = ntohl(netmask.s_addr);
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sock_in = (struct sockaddr_in *) & (ifra.ifra_mask);
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sock_in->sin_family = AF_INET;
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sock_in->sin_addr.s_addr = htonl(mask);
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sock_in->sin_len = sizeof(*sock_in);
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if (changeaddr) {
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/*
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* Interface already exists. Just change the address.
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*/
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memcpy(&ifrq.ifr_addr, &ifra.ifra_addr, sizeof(struct sockaddr));
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if (ID0ioctl(s, SIOCSIFADDR, &ifra) < 0)
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LogPrintf(LogERROR, "SetIpDevice: ioctl(SIFADDR): %s\n",
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strerror(errno));
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memcpy(&ifrq.ifr_dstaddr, &ifra.ifra_broadaddr, sizeof(struct sockaddr));
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if (ID0ioctl(s, SIOCSIFDSTADDR, &ifrq) < 0)
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LogPrintf(LogERROR, "SetIpDevice: ioctl(SIFDSTADDR): %s\n",
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strerror(errno));
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#ifdef notdef
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memcpy(&ifrq.ifr_broadaddr, &ifra.ifra_mask, sizeof(struct sockaddr));
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if (ID0ioctl(s, SIOCSIFBRDADDR, &ifrq) < 0)
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LogPrintf(LogERROR, "SetIpDevice: ioctl(SIFBRDADDR): %s\n",
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strerror(errno));
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#endif
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} else if (ID0ioctl(s, SIOCAIFADDR, &ifra) < 0) {
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LogPrintf(LogERROR, "SetIpDevice: ioctl(SIOCAIFADDR): %s\n",
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strerror(errno));
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close(s);
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return (-1);
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}
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if (Enabled(ConfProxy))
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sifproxyarp(s, hisaddr.s_addr);
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}
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close(s);
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return (0);
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}
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int
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OsSetIpaddress(struct in_addr myaddr,
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struct in_addr hisaddr,
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struct in_addr netmask)
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{
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return (SetIpDevice(myaddr, hisaddr, netmask, 1));
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}
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static struct in_addr peer_addr;
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struct in_addr defaddr;
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void
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OsLinkup()
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{
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char *s;
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if (linkup == 0) {
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reconnectState = RECON_UNKNOWN;
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if (mode & MODE_BACKGROUND && BGFiledes[1] != -1) {
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char c = EX_NORMAL;
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if (write(BGFiledes[1], &c, 1) == 1)
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LogPrintf(LogPHASE, "Parent notified of success.\n");
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else
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LogPrintf(LogPHASE, "Failed to notify parent of success.\n");
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close(BGFiledes[1]);
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BGFiledes[1] = -1;
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}
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peer_addr = IpcpInfo.his_ipaddr;
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s = (char *) inet_ntoa(peer_addr);
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if (LogIsKept(LogLINK))
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LogPrintf(LogLINK, "OsLinkup: %s\n", s);
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else
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LogPrintf(LogLCP, "OsLinkup: %s\n", s);
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if (SelectSystem(inet_ntoa(IpcpInfo.want_ipaddr), LINKUPFILE) < 0) {
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if (dstsystem) {
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if (SelectSystem(dstsystem, LINKUPFILE) < 0)
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SelectSystem("MYADDR", LINKUPFILE);
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} else
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SelectSystem("MYADDR", LINKUPFILE);
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}
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linkup = 1;
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}
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}
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int
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OsLinkIsUp()
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{
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return linkup;
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}
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void
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OsLinkdown()
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{
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char *s;
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int Level;
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if (linkup) {
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s = (char *) inet_ntoa(peer_addr);
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Level = LogIsKept(LogLINK) ? LogLINK : LogIPCP;
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LogPrintf(Level, "OsLinkdown: %s\n", s);
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FsmDown(&IpcpFsm); /* IPCP must come down */
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FsmDown(&CcpFsm); /* CCP must come down */
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if (!(mode & MODE_AUTO))
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DeleteIfRoutes(0);
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linkup = 0;
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if (SelectSystem(s, LINKDOWNFILE) < 0) {
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if (dstsystem) {
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if (SelectSystem(dstsystem, LINKDOWNFILE) < 0)
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SelectSystem("MYADDR", LINKDOWNFILE);
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} else
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SelectSystem("MYADDR", LINKDOWNFILE);
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}
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}
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}
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int
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OsInterfaceDown(int final)
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{
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struct in_addr zeroaddr;
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int s;
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OsLinkdown();
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if (!final && (mode & MODE_AUTO)) /* We still want interface alive */
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return (0);
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s = socket(AF_INET, SOCK_DGRAM, 0);
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if (s < 0) {
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LogPrintf(LogERROR, "OsInterfaceDown: socket: %s\n", strerror(errno));
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return (-1);
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}
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ifrq.ifr_flags &= ~IFF_UP;
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if (ID0ioctl(s, SIOCSIFFLAGS, &ifrq) < 0) {
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LogPrintf(LogERROR, "OsInterfaceDown: ioctl(SIOCSIFFLAGS): %s\n",
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strerror(errno));
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close(s);
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return (-1);
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}
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zeroaddr.s_addr = 0;
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SetIpDevice(zeroaddr, zeroaddr, zeroaddr, 0);
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close(s);
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return (0);
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}
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void
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OsSetInterfaceParams(int type, int mtu, int speed)
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{
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struct tuninfo info;
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info.type = type;
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info.mtu = mtu;
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if (VarPrefMTU != 0 && VarPrefMTU < mtu)
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info.mtu = VarPrefMTU;
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info.baudrate = speed;
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if (ioctl(tun_out, TUNSIFINFO, &info) < 0)
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LogPrintf(LogERROR, "OsSetInterfaceParams: ioctl(TUNSIFINFO): %s\n",
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strerror(errno));
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}
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/*
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* Open tunnel device and returns its descriptor
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*/
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#define MAX_TUN 256
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/* MAX_TUN is set at an arbitrarily large value *
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* as the loop aborts when it reaches the first *
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* 'Device not configured' (ENXIO), or the third *
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* 'No such file or directory' (ENOENT) error. */
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int
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OpenTunnel(int *ptun)
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{
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int s;
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char ifname[IFNAMSIZ];
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static char devname[14]; /* sufficient room for "/dev/tun65535" */
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unsigned unit, enoentcount = 0;
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int err;
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err = ENOENT;
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for (unit = 0; unit <= MAX_TUN; unit++) {
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snprintf(devname, sizeof(devname), "/dev/tun%d", unit);
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tun_out = ID0open(devname, O_RDWR);
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if (tun_out >= 0)
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break;
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if (errno == ENXIO) {
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unit = MAX_TUN;
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err = errno;
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} else if (errno == ENOENT) {
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enoentcount++;
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if (enoentcount > 2)
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unit = MAX_TUN;
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} else
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err = errno;
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}
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if (unit > MAX_TUN) {
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if (VarTerm)
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fprintf(VarTerm, "No tunnel device is available (%s).\n", strerror(err));
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return -1;
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}
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*ptun = unit;
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LogSetTun(unit);
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/*
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* At first, name the interface.
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*/
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strncpy(ifname, devname + 5, IFNAMSIZ - 1);
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memset(&ifra, '\0', sizeof(ifra));
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memset(&ifrq, '\0', sizeof(ifrq));
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strncpy(ifrq.ifr_name, ifname, IFNAMSIZ - 1);
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strncpy(ifra.ifra_name, ifname, IFNAMSIZ - 1);
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s = socket(AF_INET, SOCK_DGRAM, 0);
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if (s < 0) {
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LogPrintf(LogERROR, "OpenTunnel: socket(): %s\n", strerror(errno));
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return (-1);
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}
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/*
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* Now, bring up the interface.
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*/
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if (ioctl(s, SIOCGIFFLAGS, &ifrq) < 0) {
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LogPrintf(LogERROR, "OpenTunnel: ioctl(SIOCGIFFLAGS): %s\n",
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strerror(errno));
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close(s);
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return (-1);
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}
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ifrq.ifr_flags |= IFF_UP;
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if (ID0ioctl(s, SIOCSIFFLAGS, &ifrq) < 0) {
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LogPrintf(LogERROR, "OpenTunnel: ioctl(SIOCSIFFLAGS): %s\n",
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strerror(errno));
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close(s);
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return (-1);
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}
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tun_in = tun_out;
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IfDevName = devname + 5;
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if (GetIfIndex(IfDevName) < 0) {
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LogPrintf(LogERROR, "OpenTunnel: Can't find ifindex.\n");
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close(s);
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return (-1);
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}
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if (VarTerm)
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fprintf(VarTerm, "Using interface: %s\n", IfDevName);
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LogPrintf(LogPHASE, "Using interface: %s\n", IfDevName);
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close(s);
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return (0);
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}
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