ifconfig.c

Linux下网络相关工具源代码。

    while (*spp != (char *) NULL) {
	if (!strcmp(*spp, "arp")) {
	    goterr |= clr_flag(ifr.ifr_name, IFF_NOARP);
	    spp++;
	    continue;
	}
	if (!strcmp(*spp, "-arp")) {
	    goterr |= set_flag(ifr.ifr_name, IFF_NOARP);
	    spp++;
	    continue;
	}
#ifdef IFF_PORTSEL
	if (!strcmp(*spp, "media") || !strcmp(*spp, "port")) {
	    if (*++spp == NULL)
		usage();
	    if (!strcasecmp(*spp, "auto")) {
		goterr |= set_flag(ifr.ifr_name, IFF_AUTOMEDIA);
	    } else {
		int i, j, newport;
		char *endp;
		newport = strtol(*spp, &endp, 10);
		if (*endp != 0) {
		    newport = -1;
		    for (i = 0; if_port_text[i][0] && newport == -1; i++) {
			for (j = 0; if_port_text[i][j]; j++) {
			    if (!strcasecmp(*spp, if_port_text[i][j])) {
				newport = i;
				break;
			    }
			}
		    }
		}
		spp++;
		if (newport == -1) {
		    fprintf(stderr, _("Unknown media type.\n"));
		    goterr = 1;
		} else {
		    if (ioctl(skfd, SIOCGIFMAP, &ifr) < 0) {
			goterr = 1;
			continue;
		    }
		    ifr.ifr_map.port = newport;
		    if (ioctl(skfd, SIOCSIFMAP, &ifr) < 0) {
			perror("SIOCSIFMAP");
			goterr = 1;
		    }
		}
	    }
	    continue;
	}
#endif

	if (!strcmp(*spp, "trailers")) {
	    goterr |= clr_flag(ifr.ifr_name, IFF_NOTRAILERS);
	    spp++;
	    continue;
	}
	if (!strcmp(*spp, "-trailers")) {
	    goterr |= set_flag(ifr.ifr_name, IFF_NOTRAILERS);
	    spp++;
	    continue;
	}
	if (!strcmp(*spp, "promisc")) {
	    goterr |= set_flag(ifr.ifr_name, IFF_PROMISC);
	    spp++;
	    continue;
	}
	if (!strcmp(*spp, "-promisc")) {
	    goterr |= clr_flag(ifr.ifr_name, IFF_PROMISC);
	    spp++;
	    continue;
	}
	if (!strcmp(*spp, "multicast")) {
	    goterr |= set_flag(ifr.ifr_name, IFF_MULTICAST);
	    spp++;
	    continue;
	}
	if (!strcmp(*spp, "-multicast")) {
	    goterr |= clr_flag(ifr.ifr_name, IFF_MULTICAST);
	    spp++;
	    continue;
	}
	if (!strcmp(*spp, "allmulti")) {
	    goterr |= set_flag(ifr.ifr_name, IFF_ALLMULTI);
	    spp++;
	    continue;
	}
	if (!strcmp(*spp, "-allmulti")) {
	    goterr |= clr_flag(ifr.ifr_name, IFF_ALLMULTI);
	    spp++;
	    continue;
	}
	if (!strcmp(*spp, "up")) {
	    goterr |= set_flag(ifr.ifr_name, (IFF_UP | IFF_RUNNING));
	    spp++;
	    continue;
	}
	if (!strcmp(*spp, "down")) {
	    goterr |= clr_flag(ifr.ifr_name, IFF_UP);
	    spp++;
	    continue;
	}
#ifdef HAVE_DYNAMIC
	if (!strcmp(*spp, "dynamic")) {
	    goterr |= set_flag(ifr.ifr_name, IFF_DYNAMIC);
	    spp++;
	    continue;
	}
	if (!strcmp(*spp, "-dynamic")) {
	    goterr |= clr_flag(ifr.ifr_name, IFF_DYNAMIC);
	    spp++;
	    continue;
	}
#endif

	if (!strcmp(*spp, "metric")) {
	    if (*++spp == NULL)
		usage();
	    ifr.ifr_metric = atoi(*spp);
	    if (ioctl(skfd, SIOCSIFMETRIC, &ifr) < 0) {
		fprintf(stderr, "SIOCSIFMETRIC: %s\n", strerror(errno));
		goterr = 1;
	    }
	    spp++;
	    continue;
	}
	if (!strcmp(*spp, "mtu")) {
	    if (*++spp == NULL)
		usage();
	    ifr.ifr_mtu = atoi(*spp);
	    if (ioctl(skfd, SIOCSIFMTU, &ifr) < 0) {
		fprintf(stderr, "SIOCSIFMTU: %s\n", strerror(errno));
		goterr = 1;
	    }
	    spp++;
	    continue;
	}
#ifdef SIOCSKEEPALIVE
	if (!strcmp(*spp, "keepalive")) {
	    if (*++spp == NULL)
		usage();
	    ifr.ifr_data = (caddr_t) atoi(*spp);
	    if (ioctl(skfd, SIOCSKEEPALIVE, &ifr) < 0) {
		fprintf(stderr, "SIOCSKEEPALIVE: %s\n", strerror(errno));
		goterr = 1;
	    }
	    spp++;
	    continue;
	}
#endif

#ifdef SIOCSOUTFILL
	if (!strcmp(*spp, "outfill")) {
	    if (*++spp == NULL)
		usage();
	    ifr.ifr_data = (caddr_t) atoi(*spp);
	    if (ioctl(skfd, SIOCSOUTFILL, &ifr) < 0) {
		fprintf(stderr, "SIOCSOUTFILL: %s\n", strerror(errno));
		goterr = 1;
	    }
	    spp++;
	    continue;
	}
#endif

	if (!strcmp(*spp, "-broadcast")) {
	    goterr |= clr_flag(ifr.ifr_name, IFF_BROADCAST);
	    spp++;
	    continue;
	}
	if (!strcmp(*spp, "broadcast")) {
	    if (*++spp != NULL) {
		safe_strncpy(host, *spp, (sizeof host));
		if (ap->input(0, host, &sa) < 0) {
		    ap->herror(host);
		    goterr = 1;
		    spp++;
		    continue;
		}
		memcpy((char *) &ifr.ifr_broadaddr, (char *) &sa,
		       sizeof(struct sockaddr));
		if (ioctl(ap->fd, SIOCSIFBRDADDR, &ifr) < 0) {
		    fprintf(stderr, "SIOCSIFBRDADDR: %s\n",
			    strerror(errno));
		    goterr = 1;
		}
		spp++;
	    }
	    goterr |= set_flag(ifr.ifr_name, IFF_BROADCAST);
	    continue;
	}
	if (!strcmp(*spp, "dstaddr")) {
	    if (*++spp == NULL)
		usage();
	    safe_strncpy(host, *spp, (sizeof host));
	    if (ap->input(0, host, &sa) < 0) {
		ap->herror(host);
		goterr = 1;
		spp++;
		continue;
	    }
	    memcpy((char *) &ifr.ifr_dstaddr, (char *) &sa,
		   sizeof(struct sockaddr));
	    if (ioctl(ap->fd, SIOCSIFDSTADDR, &ifr) < 0) {
		fprintf(stderr, "SIOCSIFDSTADDR: %s\n",
			strerror(errno));
		goterr = 1;
	    }
	    spp++;
	    continue;
	}
	if (!strcmp(*spp, "netmask")) {
	    if (*++spp == NULL || didnetmask)
		usage();
	    safe_strncpy(host, *spp, (sizeof host));
	    if (ap->input(0, host, &sa) < 0) {
		ap->herror(host);
		goterr = 1;
		spp++;
		continue;
	    }
	    didnetmask++;
	    goterr = set_netmask(ap->fd, &ifr, &sa);
	    spp++;
	    continue;
	}
#ifdef HAVE_TXQUEUELEN
	if (!strcmp(*spp, "txqueuelen")) {
	    if (*++spp == NULL)
		usage();
	    ifr.ifr_qlen = strtoul(*spp, NULL, 0);
	    if (ioctl(skfd, SIOCSIFTXQLEN, &ifr) < 0) {
		fprintf(stderr, "SIOCSIFTXQLEN: %s\n", strerror(errno));
		goterr = 1;
	    }
	    spp++;
	    continue;
	}
#endif

	if (!strcmp(*spp, "mem_start")) {
	    if (*++spp == NULL)
		usage();
	    if (ioctl(skfd, SIOCGIFMAP, &ifr) < 0) {
		goterr = 1;
		continue;
	    }
	    ifr.ifr_map.mem_start = strtoul(*spp, NULL, 0);
	    if (ioctl(skfd, SIOCSIFMAP, &ifr) < 0) {
		fprintf(stderr, "SIOCSIFMAP: %s\n", strerror(errno));
		goterr = 1;
	    }
	    spp++;
	    continue;
	}
	if (!strcmp(*spp, "io_addr")) {
	    if (*++spp == NULL)
		usage();
	    if (ioctl(skfd, SIOCGIFMAP, &ifr) < 0) {
		goterr = 1;
		continue;
	    }
	    ifr.ifr_map.base_addr = strtol(*spp, NULL, 0);
	    if (ioctl(skfd, SIOCSIFMAP, &ifr) < 0) {
		fprintf(stderr, "SIOCSIFMAP: %s\n", strerror(errno));
		goterr = 1;
	    }
	    spp++;
	    continue;
	}
	if (!strcmp(*spp, "irq")) {
	    if (*++spp == NULL)
		usage();
	    if (ioctl(skfd, SIOCGIFMAP, &ifr) < 0) {
		goterr = 1;
		continue;
	    }
	    ifr.ifr_map.irq = atoi(*spp);
	    if (ioctl(skfd, SIOCSIFMAP, &ifr) < 0) {
		fprintf(stderr, "SIOCSIFMAP: %s\n", strerror(errno));
		goterr = 1;
	    }
	    spp++;
	    continue;
	}
	if (!strcmp(*spp, "-pointopoint")) {
	    goterr |= clr_flag(ifr.ifr_name, IFF_POINTOPOINT);
	    spp++;
	    continue;
	}
	if (!strcmp(*spp, "pointopoint")) {
	    if (*(spp + 1) != NULL) {
		spp++;
		safe_strncpy(host, *spp, (sizeof host));
		if (ap->input(0, host, &sa)) {
		    ap->herror(host);
		    goterr = 1;
		    spp++;
		    continue;
		}
		memcpy((char *) &ifr.ifr_dstaddr, (char *) &sa,
		       sizeof(struct sockaddr));
		if (ioctl(ap->fd, SIOCSIFDSTADDR, &ifr) < 0) {
		    fprintf(stderr, "SIOCSIFDSTADDR: %s\n",
			    strerror(errno));
		    goterr = 1;
		}
	    }
	    goterr |= set_flag(ifr.ifr_name, IFF_POINTOPOINT);
	    spp++;
	    continue;
	};

	if (!strcmp(*spp, "hw")) {
	    if (*++spp == NULL)
		usage();
	    if ((hw = get_hwtype(*spp)) == NULL)
		usage();
	    if (*++spp == NULL)
		usage();
	    safe_strncpy(host, *spp, (sizeof host));
	    if (hw->input(host, &sa) < 0) {
		fprintf(stderr, _("%s: invalid %s address.\n"), host, hw->name);
		goterr = 1;
		spp++;
		continue;
	    }
	    memcpy((char *) &ifr.ifr_hwaddr, (char *) &sa,
		   sizeof(struct sockaddr));
	    if (ioctl(skfd, SIOCSIFHWADDR, &ifr) < 0) {
		fprintf(stderr, "SIOCSIFHWADDR: %s\n",
			strerror(errno));
		goterr = 1;
	    }
	    spp++;
	    continue;
	}
#if HAVE_AFINET6
	if (!strcmp(*spp, "add")) {
	    if (*++spp == NULL)
		usage();
	    if ((cp = strchr(*spp, '/'))) {
		prefix_len = atol(cp + 1);
		if ((prefix_len < 0) || (prefix_len > 128))
		    usage();
		*cp = 0;
	    } else {
		prefix_len = 0;
	    }
	    safe_strncpy(host, *spp, (sizeof host));
	    if (inet6_aftype.input(1, host, (struct sockaddr *) &sa6) < 0) {
		inet6_aftype.herror(host);
		goterr = 1;
		spp++;
		continue;
	    }
	    memcpy((char *) &ifr6.ifr6_addr, (char *) &sa6.sin6_addr,
		   sizeof(struct in6_addr));

	    fd = get_socket_for_af(AF_INET6);
	    if (fd < 0) {
		fprintf(stderr, _("No support for INET6 on this system.\n"));
		goterr = 1;
		spp++;
		continue;
	    }
	    if (ioctl(fd, SIOGIFINDEX, &ifr) < 0) {
		perror("SIOGIFINDEX");
		goterr = 1;
		spp++;
		continue;
	    }
	    ifr6.ifr6_ifindex = ifr.ifr_ifindex;
	    ifr6.ifr6_prefixlen = prefix_len;
	    if (ioctl(fd, SIOCSIFADDR, &ifr6) < 0) {
		perror("SIOCSIFADDR");
		goterr = 1;
	    }
	    spp++;
	    continue;
	}
	if (!strcmp(*spp, "del")) {
	    if (*++spp == NULL)
		usage();
	    if ((cp = strchr(*spp, '/'))) {
		prefix_len = atol(cp + 1);
		if ((prefix_len < 0) || (prefix_len > 128))
		    usage();
		*cp = 0;
	    } else {
		prefix_len = 0;
	    }
	    safe_strncpy(host, *spp, (sizeof host));
	    if (inet6_aftype.input(1, host, (struct sockaddr *) &sa6) < 0) {
		inet6_aftype.herror(host);
		goterr = 1;
		spp++;
		continue;
	    }
	    memcpy((char *) &ifr6.ifr6_addr, (char *) &sa6.sin6_addr,
		   sizeof(struct in6_addr));

	    fd = get_socket_for_af(AF_INET6);
	    if (fd < 0) {
		fprintf(stderr, _("No support for INET6 on this system.\n"));
		goterr = 1;
		spp++;
		continue;
	    }
	    if (ioctl(fd, SIOGIFINDEX, &ifr) < 0) {
		perror("SIOGIFINDEX");
		goterr = 1;
		spp++;
		continue;
	    }
	    ifr6.ifr6_ifindex = ifr.ifr_ifindex;
	    ifr6.ifr6_prefixlen = prefix_len;
#ifdef SIOCDIFADDR
	    if (ioctl(fd, SIOCDIFADDR, &ifr6) < 0) {
		fprintf(stderr, "SIOCDIFADDR: %s\n",
			strerror(errno));
		goterr = 1;
	    }
#else
	    fprintf(stderr, _("Address deletion not supported on this system.\n"));
#endif
	    spp++;
	    continue;
	}
	if (!strcmp(*spp, "tunnel")) {
	    if (*++spp == NULL)
		usage();
	    if ((cp = strchr(*spp, '/'))) {
		prefix_len = atol(cp + 1);
		if ((prefix_len < 0) || (prefix_len > 128))
		    usage();
		*cp = 0;
	    } else {
		prefix_len = 0;
	    }
	    safe_strncpy(host, *spp, (sizeof host));
	    if (inet6_aftype.input(1, host, (struct sockaddr *) &sa6) < 0) {
		inet6_aftype.herror(host);
		goterr = 1;
		spp++;
		continue;
	    }
	    memcpy((char *) &ifr6.ifr6_addr, (char *) &sa6.sin6_addr,
		   sizeof(struct in6_addr));

	    fd = get_socket_for_af(AF_INET6);
	    if (fd < 0) {
		fprintf(stderr, _("No support for INET6 on this system.\n"));
		goterr = 1;
		spp++;
		continue;
	    }
	    if (ioctl(fd, SIOGIFINDEX, &ifr) < 0) {
		perror("SIOGIFINDEX");
		goterr = 1;
		spp++;
		continue;
	    }
	    ifr6.ifr6_ifindex = ifr.ifr_ifindex;
	    ifr6.ifr6_prefixlen = prefix_len;

	    if (ioctl(fd, SIOCSIFDSTADDR, &ifr6) < 0) {
		fprintf(stderr, "SIOCSIFDSTADDR: %s\n",
			strerror(errno));
		goterr = 1;
	    }
	    spp++;
	    continue;
	}
#endif

	/* If the next argument is a valid hostname, assume OK. */
	safe_strncpy(host, *spp, (sizeof host));

	/* FIXME: sa is too small for INET6 addresses, inet6 should use that too, 
	   broadcast is unexpected */
	if (ap->getmask) {
	    switch (ap->getmask(host, &sa, NULL)) {
	    case -1:
		usage();
		break;
	    case 1:
		if (didnetmask)
		    usage();

		goterr = set_netmask(skfd, &ifr, &sa);
		didnetmask++;
		break;
	    }
	}
	if (ap->input(0, host, &sa) < 0) {
	    ap->herror(host);
	    usage();
	}
	memcpy((char *) &ifr.ifr_addr, (char *) &sa, sizeof(struct sockaddr));
	{
	    int r = 0;		/* to shut gcc up */
	    switch (ap->af) {
#if HAVE_AFINET
	    case AF_INET:
		fd = get_socket_for_af(AF_INET);
		if (fd < 0) {
		    fprintf(stderr, _("No support for INET on this system.\n"));
		    exit(1);
		}
		r = ioctl(fd, SIOCSIFADDR, &ifr);
		break;
#endif
#if HAVE_AFECONET
	    case AF_ECONET:
		fd = get_socket_for_af(AF_ECONET);
		if (fd < 0) {
		    fprintf(stderr, _("No support for ECONET on this system.\n"));
		    exit(1);
		}
		r = ioctl(fd, SIOCSIFADDR, &ifr);
		break;
#endif
	    default:
		fprintf(stderr,
		_("Don't know how to set addresses for family %d.\n"), ap->af);
		exit(1);
	    }
	    if (r < 0) {
		perror("SIOCSIFADDR");
		goterr = 1;
	    }
	}
       /*
        * Don't do the set_flag() if the address is an alias with a - at the
        * end, since it's deleted already! - Roman
        *
        * Should really use regex.h here, not sure though how well it'll go
        * with the cross-platform support etc. 
        */
        {
            char *ptr;
            short int found_colon = 0;
            for (ptr = ifr.ifr_name; *ptr; ptr++ )
                if (*ptr == ':') found_colon++;
                
            if (!(found_colon && *(ptr - 1) == '-'))
                goterr |= set_flag(ifr.ifr_name, (IFF_UP | IFF_RUNNING));
        }

	spp++;
    }

    return (goterr);
}