route.c

Linux下网络相关工具源代码。

/*
 * route        This file contains an implementation of the command
 *              that manages the IP routing table in the kernel.
 *
 * Version:     $Id: route.c,v 1.6 1999/04/18 20:28:41 philip Exp $
 *
 * Maintainer:  Bernd 'eckes' Eckenfels, <[e-mail]>
 *
 * Author:      Fred N. van Kempen, <[e-mail]>
 *              (derived from FvK's 'route.c     1.70    01/04/94')
 *
 * Modifications:
 *              Johannes Stille:        for Net-2Debugged by 
 *                                      <[e-mail]>
 *              Linus Torvalds:         Misc Changes
 *              Alan Cox:               add the new mtu/window stuff
 *              Miquel van Smoorenburg: rt_add and rt_del
 *       {1.79} Bernd Eckenfels:        route_info
 *       {1.80} Bernd Eckenfels:        reject, metric, irtt, 1.2.x support.
 *       {1.81} Bernd Eckenfels:        reject routes need a dummy device
 *960127 {1.82} Bernd Eckenfels:        'mod' and 'dyn' 'reinstate' added
 *960129 {1.83} Bernd Eckenfels:        resolve and getsock now in lib/, 
 *                                      REJECT displays '-' as gatway.
 *960202 {1.84} Bernd Eckenfels:        net-features support added
 *960203 {1.85} Bernd Eckenfels:        "#ifdef' in '#if' for net-features
 *                                      -A  (aftrans) support, get_longopts
 *960206 {1.86} Bernd Eckenfels:        route_init();
 *960218 {1.87} Bernd Eckenfels:        netinet/in.h added
 *960221 {1.88} Bernd Eckenfels:        aftrans_dfl support
 *960222 {1.90} Bernd Eckenfels:        moved all AF specific code to lib/.
 *960413 {1.91} Bernd Eckenfels:        new RTACTION support+FLAG_CACHE/FIB
 *960426 {1.92} Bernd Eckenfels:        FLAG_SYM/-N support
 *960823 {x.xx} Frank Strauss:          INET6 stuff
 *980629 {1.95} Arnaldo Carvalho de Melo: gettext instead of catgets
 *990101 {1.96} Bernd Eckenfels:	fixed usage and FLAG_CACHE Output
 *
 */
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
/* #include <net/route.h> realy broken */
#include <netinet/in.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h>
#include <linux/param.h>
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <unistd.h>
#include <ctype.h>
#include "net-support.h"
#include "config.h"
#include "intl.h"
#include "pathnames.h"
#include "version.h"

#define DFLT_AF "inet"

#define FEATURE_ROUTE
#include "lib/net-features.h"	/* needs some of the system includes above! */

char *Release = RELEASE, *Version = "route 1.96 (1999-01-01)";

int opt_n = 0;			/* numerical output flag        */
int opt_v = 0;			/* debugging output flag        */
int opt_e = 1;			/* 1,2,3=type of routetable     */
int opt_fc = 0;			/* routing cache/FIB */
int opt_h = 0;			/* help selected                */
struct aftype *ap;		/* current address family       */

static void usage(void)
{
    fprintf(stderr, _("Usage: route [-nNvee] [-FC] [<AF>]           List kernel routing tables\n"));
    fprintf(stderr, _("       route [-v] [-FC] {add|del|flush} ...  Modify routing table for AF.\n\n"));

    fprintf(stderr, _("       route {-h|--help} [<AF>]              Detailed usage syntax for specified AF.\n"));
    fprintf(stderr, _("       route {-V|--version}                  Display version/author and exit.\n\n"));

    fprintf(stderr, _("        -v, --verbose            be verbose\n"));
    fprintf(stderr, _("        -n, --numeric            dont resolve names\n"));
    fprintf(stderr, _("        -N, --symbolic           resolve hardware names\n"));
    fprintf(stderr, _("        -e, --extend             display other/more information\n"));
    fprintf(stderr, _("        -F, --fib                display Forwarding Information Base (default)\n"));
    fprintf(stderr, _("        -C, --cache              display routing cache instead of FIB\n\n"));

    fprintf(stderr, _("  <AF>=Use '-A <af>' or '--<af>' Default: %s\n"), DFLT_AF);
    fprintf(stderr, _("  List of possible address families (which support routing):\n"));
    print_aflist(1); /* 1 = routeable */
    exit(E_USAGE);
}


static void version(void)
{
    fprintf(stderr, "%s\n%s\n%s\n", Release, Version, Features);
    exit(E_VERSION);
}


int main(int argc, char **argv)
{
    int i, lop, what = 0;
    struct option longopts[] =
    {
	AFTRANS_OPTS,
	{"extend", 0, 0, 'e'},
	{"verbose", 0, 0, 'v'},
	{"version", 0, 0, 'V'},
	{"numeric", 0, 0, 'n'},
	{"symbolic", 0, 0, 'N'},
	{"protocol", 1, 0, 'A'},
	{"cache", 0, 0, 'C'},
	{"fib", 0, 0, 'F'},
	{"help", 0, 0, 'h'},
	{NULL, 0, 0, 0}
    };
    char **tmp;
    char *progname;
    int options;
#if I18N
    bindtextdomain("net-tools", "/usr/share/locale");
    textdomain("net-tools");
#endif
    getroute_init();		/* Set up AF routing support */
    setroute_init();
    afname[0] = '\0';
    progname = argv[0];

    /* getopts and -net wont work :-/ */
    for (tmp = argv; *tmp; tmp++) {
	if (!strcmp(*tmp, "-net"))
	    strcpy(*tmp, "#net");
	else if (!strcmp(*tmp, "-host"))
	    strcpy(*tmp, "#host");
    }

    /* Fetch the command-line arguments. */
    while ((i = getopt_long(argc, argv, "A:eCFhnNVv?", longopts, &lop)) != EOF)
	switch (i) {
	case -1:
	    break;
	case 'n':
	    opt_n |= FLAG_NUM;
	    break;
	case 'N':
	    opt_n |= FLAG_SYM;
	    break;
	case 'v':
	    opt_v |= FLAG_VERBOSE;
	    break;
	case 'e':
	    opt_e++;
	    break;
	case 1:
	    if (lop < 0 || lop >= AFTRANS_CNT) {
		EINTERN("route.c", "longopts 1 range");
		break;
	    }
	    if ((i = aftrans_opt(longopts[lop].name)))
		exit(i);
	    break;
	case 'C':
	    opt_fc |= FLAG_CACHE;
	    break;
	case 'F':
	    opt_fc |= FLAG_FIB;
	    break;
	case 'A':
	    if ((i = aftrans_opt(optarg)))
		exit(i);
	    break;
	case 'V':
	    version();
	case 'h':
	case '?':
	    opt_h++;
	    break;
	default:
	    usage();
	}

    argv += optind;
    argc -= optind;

    if (opt_h) {
	if (!afname[0])
	    usage();
	else
	    what = RTACTION_HELP;
    } else {
	if (!afname[0])
	    /* this will initialise afname[] */
	    aftrans_def("route", progname, DFLT_AF);

	/* Do we have to show the contents of the routing table? */
	if (*argv == NULL) {
	    what = RTACTION_SHOW;
	} else {
	    if (!strcmp(*argv, "add"))
		what = RTACTION_ADD;
	    else if (!strcmp(*argv, "del") || !strcmp(*argv, "delete"))
		what = RTACTION_DEL;
	    else if (!strcmp(*argv, "flush"))
		what = RTACTION_FLUSH;
	    else
		usage();
	}
    }

    options = (opt_e & FLAG_EXT) | opt_n | opt_fc | opt_v;
    if (!opt_fc)
	options |= FLAG_FIB;

    if (what == RTACTION_SHOW)
	i = route_info(afname, options);
    else
	i = route_edit(what, afname, options, ++argv);

    if (i == E_OPTERR)
	usage();

    return (i);
}