usr/src/sbin/route/route.c

#ifndef lint
static char sccsid[] = "@(#)route.c     4.1 82/04/02";
#endif

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/route.h>
#include <net/in.h>
#include <errno.h>
#include <ctype.h>

struct  rtentry route;
int     options;
int     s;
struct  sockaddr_in sin = { AF_INET };

main(argc, argv)
        int argc;
        char *argv[];
{

        if (argc < 2)
                printf("usage: route [ cmd ] [ args ]\n"), exit(1);
        s = socket(SOCK_RAW, 0, 0, options);
        if (s < 0) {
                perror("socket");
                exit(1);
        }
        argc--, argv++;
        if (strcmp(*argv, "add") == 0)
                newroute(argc, argv);
        else if (strcmp(*argv, "delete") == 0)
                newroute(argc, argv);
        else if (strcmp(*argv, "change") == 0)
                changeroute(argc-1, argv+1);
        else
                printf("%s: huh?\n", *argv);
}

newroute(argc, argv)
        int argc;
        char *argv[];
{
        struct sockaddr_in *sin;
        char *cmd;

        if (argc < 3) {
                printf("usage: %s destination gateway\n", argv[0]);
                return;
        }
        cmd = *argv++;
        getaddr(*argv++, &route.rt_dst);
        getaddr(*argv, &route.rt_gateway);
        sin = (struct sockaddr_in *)&route.rt_dst;
        route.rt_flags = RTF_UP;
        if (sin->sin_addr.s_host || sin->sin_addr.s_imp)
                route.rt_flags |= RTF_HOST;
        printf("%s %x: gateway %x\n", cmd, sin->sin_addr,
                ((struct sockaddr_in *)&route.rt_gateway)->sin_addr);
        if (ioctl(s, *cmd == 'a' ? SIOCADDRT : SIOCDELRT, (caddr_t)&route))
                error(cmd);
}

changeroute(argc, argv)
        int argc;
        char *argv[];
{
        printf("not supported\n");
}

error(cmd)
        char *cmd;
{
        extern int errno;

        if (errno == ESRCH)
                fprintf(stderr, "not in table\n");
        else if (errno == EBUSY)
                fprintf(stderr, "entry in use\n");
        else if (errno == ENOBUFS)
                fprintf(stderr, "routing table overflow\n");
        else
                perror(cmd);
}

getaddr(s, sin)
        char *s;
        struct sockaddr_in *sin;
{
        sin->sin_family = AF_INET;
        if ((sin->sin_addr.s_addr = rhost(&s)) != -1)
                return;
        if (!isdigit(*s)) {
                fprintf(stderr, "%s: unknown host\n", s);
                exit(1);
        }
        sin->sin_addr.s_addr = atoi(s);
        if (sin->sin_addr.s_addr == -1) {
                fprintf(stderr, "%s: bad value\n", s);
                exit(1);
        }
}