print_route6.c

支持IPv6的adov路由协议（本人修改后）

/*****************************************************************************
 *
 * Copyright (C) 2003 Simon Fraser University and NewMIC
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author: Peter Lee       <[e-mail]>
 *
 *****************************************************************************/
#include "print_route6.h"

#include <asm/types.h>
#include <asm/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <arpa/nameser.h>
#include <net/route.h>
#include <ctype.h>
#include <errno.h>
#include <netdb.h>
#include <resolv.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>

#define _PATH_PROCNET_ROUTE6               "/proc/net/ipv6_route"
#define E_INTERN 2
#define FLAG_EXT       3		/* AND-Mask */
#define FLAG_NUM_HOST  4
#define FLAG_SYM      32
#define FLAG_FIB     128


/* Like strncpy but make sure the resulting string is always 0 terminated. */  
char *safe_strncpy(char *dst, const char *src, size_t size)
{   
    dst[size-1] = '\0';
    return strncpy(dst,src,size-1);   
}



static int INET6_resolve(char *name, struct sockaddr_in6 *sin6)
{
    struct addrinfo req, *ai;
    int s;

    memset (&req, '\0', sizeof req);
    req.ai_family = AF_INET6;
    if ((s = getaddrinfo(name, NULL, &req, &ai))) {
	fprintf(stderr, "getaddrinfo: %s: %d\n", name, s);
	return -1;
    }
    memcpy(sin6, ai->ai_addr, sizeof(struct sockaddr_in6));

    freeaddrinfo(ai);

    return (0);
}
static int INET6_rresolve(char *name, struct sockaddr_in6 *sin6, int numeric)
{
    int s;

    /* Grmpf. -FvK */
    if (sin6->sin6_family != AF_INET6) {
#ifdef DEBUG
	fprintf(stderr, ("rresolve: unsupport address family %d !\n"),
		sin6->sin6_family);
#endif
	errno = EAFNOSUPPORT;
	return (-1);
    }
    if (numeric & 0x7FFF) {
	inet_ntop(AF_INET6, &sin6->sin6_addr, name, 80);
	return (0);
    }
    if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
        if (numeric & 0x8000)
	    strcpy(name, "default");
	else
	    strcpy(name, "*");
	return (0);
    }

    if ((s = getnameinfo((struct sockaddr *) sin6, sizeof(struct sockaddr_in6),
			 name, 255 /* !! */ , NULL, 0, 0))) {
	fputs("getnameinfo failed\n", stderr);
	return -1;
    }
    return (0);
}


/* Display an Internet socket address. */
/* dirty! struct sockaddr usually doesn't suffer for inet6 addresses, fst. */
static char *INET6_sprint(struct sockaddr *sap, int numeric)
{
    static char buff[128];

    if (sap->sa_family == 0xFFFF || sap->sa_family == 0)
	return safe_strncpy(buff, ("[NONE SET]"), sizeof(buff));
    if (INET6_rresolve(buff, (struct sockaddr_in6 *) sap, numeric) != 0)
	return safe_strncpy(buff, ("[UNKNOWN]"), sizeof(buff));
    return (buff);
}


static int INET6_getsock(char *bufp, struct sockaddr *sap)
{
    struct sockaddr_in6 *sin6;

    sin6 = (struct sockaddr_in6 *) sap;
    sin6->sin6_family = AF_INET6;
    sin6->sin6_port = 0;

    if (inet_pton(AF_INET6, bufp, sin6->sin6_addr.s6_addr) <= 0)
	return (-1);

    return 16;			/* ?;) */
}

static int INET6_input(int type, char *bufp, struct sockaddr *sap)
{
    switch (type) {
    case 1:
	return (INET6_getsock(bufp, sap));
    default:
	return (INET6_resolve(bufp, (struct sockaddr_in6 *) sap));
    }
}


int rprint_fib6(int ext, int numeric)
{
    char buff[4096], iface[16], flags[16];
    char addr6[128], naddr6[128];
    struct sockaddr_in6 saddr6, snaddr6;
    int num, iflags, metric, refcnt, use, prefix_len, slen;
    FILE *fp = fopen(_PATH_PROCNET_ROUTE6, "r");
    
    char addr6p[8][5], saddr6p[8][5], naddr6p[8][5];

    if (!fp) {
	perror(_PATH_PROCNET_ROUTE6);
        printf(("INET6 (IPv6) not configured in this system.\n"));
	return 1;
    }
    printf(("Kernel IPv6 routing table\n"));

    printf(("Destination                                 "
	     "Next Hop                                "
	     "Flags Metric Ref    Use Iface\n"));

    while (fgets(buff, 1023, fp)) {
	num = sscanf(buff, "%4s%4s%4s%4s%4s%4s%4s%4s %02x %4s%4s%4s%4s%4s%4s%4s%4s %02x %4s%4s%4s%4s%4s%4s%4s%4s %08x %08x %08x %08x %s\n",
		     addr6p[0], addr6p[1], addr6p[2], addr6p[3],
		     addr6p[4], addr6p[5], addr6p[6], addr6p[7],
		     &prefix_len,
		     saddr6p[0], saddr6p[1], saddr6p[2], saddr6p[3],
		     saddr6p[4], saddr6p[5], saddr6p[6], saddr6p[7],
		     &slen,
		     naddr6p[0], naddr6p[1], naddr6p[2], naddr6p[3],
		     naddr6p[4], naddr6p[5], naddr6p[6], naddr6p[7],
		     &metric, &use, &refcnt, &iflags, iface);
#if 0
	if (num < 23)
	    continue;
#endif
	if (!(iflags & RTF_UP))
	    continue;
	/* Fetch and resolve the target address. */
	snprintf(addr6, sizeof(addr6), "%s:%s:%s:%s:%s:%s:%s:%s",
		 addr6p[0], addr6p[1], addr6p[2], addr6p[3],
		 addr6p[4], addr6p[5], addr6p[6], addr6p[7]);
	//inet6_aftype.input(1, addr6, (struct sockaddr *) &saddr6);
	INET6_input(1, addr6, (struct sockaddr *) &saddr6);
	//PL:
	/*
	snprintf(addr6, sizeof(addr6), "%s/%d",
		 inet6_aftype.sprint((struct sockaddr *) &saddr6, 1),
		 prefix_len);
	*/
	snprintf(addr6, sizeof(addr6), "%s/%d",
		 INET6_sprint((struct sockaddr *) &saddr6, 1),
		 prefix_len);

	/* Fetch and resolve the nexthop address. */
	snprintf(naddr6, sizeof(naddr6), "%s:%s:%s:%s:%s:%s:%s:%s",
		 naddr6p[0], naddr6p[1], naddr6p[2], naddr6p[3],
		 naddr6p[4], naddr6p[5], naddr6p[6], naddr6p[7]);
	//inet6_aftype.input(1, naddr6, (struct sockaddr *) &snaddr6);
	INET6_input(1, naddr6, (struct sockaddr *) &snaddr6);
	/*
	snprintf(naddr6, sizeof(naddr6), "%s",
		 inet6_aftype.sprint((struct sockaddr *) &snaddr6, 1));
	*/
	snprintf(naddr6, sizeof(naddr6), "%s",
		 INET6_sprint((struct sockaddr *) &snaddr6, 1));

	/* Decode the flags. */
	strcpy(flags, "U");
	if (iflags & RTF_GATEWAY)
	    strcat(flags, "G");
	if (iflags & RTF_HOST)
	    strcat(flags, "H");
	if (iflags & RTF_DEFAULT)
	    strcat(flags, "D");
	if (iflags & RTF_ADDRCONF)
	    strcat(flags, "A");
	if (iflags & RTF_CACHE)
	    strcat(flags, "C");

	/* Print the info. */
	printf("%-43s %-39s %-5s %-6d %-2d %7d %-8s\n",
	       addr6, naddr6, flags, metric, refcnt, use, iface);
    }

    (void) fclose(fp);
    return (0);
}


void print_route6()
{
    int ext = FLAG_FIB & FLAG_EXT;
    int numeric = FLAG_FIB & (FLAG_NUM_HOST | FLAG_SYM);
    int rc = E_INTERN;

    printf("\n");
    rc = rprint_fib6(ext, numeric);
    printf("\n");
}