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/* route.c Route file reader
*
* $Id: route.c,v 1.3 1995/03/19 17:21:06 bdale Exp $
*
* Copyright 1991, Michael Westerhof, Sun Microsystems, Inc.
* This software may be freely used, distributed, or modified, providing
* this header is not removed.
*
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <memory.h>
#include <fcntl.h>
#include <string.h>
#include <ctype.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <syslog.h>
#include <stdlib.h>
#include "ipip.h"
static void rerr(); /* General error printer */
static void init_route();
static void r_route();
static void print_routes();
static int rlineno;
static int rerrflag;
/*
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* open and read the route file
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*/
int
read_routes(f)
char *f;
{
FILE *cf;
char buf[256], *p;
init_route();
/* Open the route file */
if((cf = fopen(f,"r"))==NULL){
(void)fprintf(stderr,"%sRoute file %s not found or could not be opened\n",progname,f);
return -1;
}
while(fgets(buf, 255, cf)!=NULL){
rlineno++;
if((p = strtok(buf, " \t\n\r"))==NULL)continue;
if(*p=='#' || *p==';')continue;
if(strcmp(p,"route")==0)r_route();
/* else if(strcmp(p,"whatever")==0)r_dowhatever(); */
else rerr("Unrecognized command: %s",p);
}
if(rts_top==0)rerr("No routes defined","");
if(debugd)print_routes();
return rerrflag;
}
/*
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Initialize defaults and null route entries
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*/
static void
init_route()
{
int i;
for(i=0;i<MAX_ROUTES;i++){
rts[i].ipaddr = 0;
rts[i].mask = 0xffffffff;
rts[i].destif = NULL;
rts[i].destaddr = 0;
rts[i].destport = 0;
rts[i].hits = 0;
}
rts_top = 0;
rlineno = 0;
rerrflag = 0;
}
/*
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Print out the route table (DEBUG)
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*/
static void
print_routes()
{
int i, port, type;
unsigned char *p, *q;
char *id;
unsigned int m;
if(rerrflag==0)(void)syslog(LOG_DEBUG,"%d routes:", rts_top);
else (void)syslog(LOG_DEBUG,"%d routes (there are errors):", rts_top);
for(i=0;i<rts_top;i++){
p = (unsigned char *)&rts[i].ipaddr;
q = (unsigned char *)&rts[i].destaddr;
if(rts[i].destif != NULL){
id = rts[i].destif->id;
type = rts[i].destif->type;
} else {
id = "unknown";
type = IF_TYPE_NONE;
}
port = ntohs(rts[i].destport);
m = ntohl(rts[i].mask);
if((type == IF_TYPE_SLIP)||
(type == IF_TYPE_TUN)){
(void)syslog(LOG_DEBUG,"ip %d.%d.%d.%d mask 0x%08x interface %s\n",
p[0],p[1],p[2],p[3],m,id);
} else if(type == IF_TYPE_IPIP){
(void)syslog(LOG_DEBUG,"ip %d.%d.%d.%d mask 0x%08x interface %s ip %d.%d.%d.%d\n",
p[0],p[1],p[2],p[3],m,id,
q[0],q[1],q[2],q[3]);
} else {
(void)syslog(LOG_DEBUG,"ip %d.%d.%d.%d mask 0x%08x interface %s ip %d.%d.%d.%d port %d\n",
p[0],p[1],p[2],p[3],m,id,
q[0],q[1],q[2],q[3],port);
}
}
}
/*
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Print a general route file error
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*/
static void
rerr(s,a)
char *s;
char *a;
{
(void)syslog(LOG_ERR,"Route file error at line %d:\n",rlineno);
(void)syslog(LOG_ERR,s,a);
rerrflag--;
}
/*
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Handle the "route" command
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*/
static void
r_route()
{
int i, syntax;
char *q;
struct hostent *he;
if(rts_top>=MAX_ROUTES){
rerr("Too many routes defined","");
return;
}
syntax = 0;
if((q = strtok((char *)NULL, " \t\n\r"))){
if((he = gethostbyname(q))){
(void)memcpy((char *)&rts[rts_top].ipaddr,
he->h_addr_list[0], 4);
} else {
if((rts[rts_top].ipaddr = inet_addr(q)) == 0xffffffff)
rerr("Bad IP address: %s",q);
}
} else syntax++;
if((q = strtok((char *)NULL, " \t\n\r"))){
rts[rts_top].mask = htonl(strtoul(q, NULL, 0));
} else syntax++;
if((q = strtok((char *)NULL, " \t\n\r"))){
for(i=0;i<ifs_top;i++){
if(strcmp(q,ifs[i].id)==0)rts[rts_top].destif = &ifs[i];
}
if(rts[rts_top].destif == NULL)
rerr("Interface %s not defined",q);
} else syntax++;
if((q = strtok((char *)NULL, " \t\n\r"))){
if((he = gethostbyname(q))){
(void)memcpy((char *)&rts[rts_top].destaddr,
he->h_addr_list[0], 4);
} else {
if((rts[rts_top].destaddr = inet_addr(q)) == (unsigned long)-1)
rerr("Bad destination IP address: %s",q);
}
}
if((q = strtok((char *)NULL, " \t\n\r"))){
rts[rts_top].destport = htons((unsigned short)atoi(q));
}
if(syntax)rerr("Syntax error (route <ipaddr> <mask> <iface> [<destipaddr> [<destport>]]","");
rts_top++;
}
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