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libpdel

    1: 
    2: /*
    3:  * Copyright (c) 2001-2002 Packet Design, LLC.
    4:  * All rights reserved.
    5:  * 
    6:  * Subject to the following obligations and disclaimer of warranty,
    7:  * use and redistribution of this software, in source or object code
    8:  * forms, with or without modifications are expressly permitted by
    9:  * Packet Design; provided, however, that:
   10:  * 
   11:  *    (i)  Any and all reproductions of the source or object code
   12:  *         must include the copyright notice above and the following
   13:  *         disclaimer of warranties; and
   14:  *    (ii) No rights are granted, in any manner or form, to use
   15:  *         Packet Design trademarks, including the mark "PACKET DESIGN"
   16:  *         on advertising, endorsements, or otherwise except as such
   17:  *         appears in the above copyright notice or in the software.
   18:  * 
   19:  * THIS SOFTWARE IS BEING PROVIDED BY PACKET DESIGN "AS IS", AND
   20:  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, PACKET DESIGN MAKES NO
   21:  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING
   22:  * THIS SOFTWARE, INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED
   23:  * WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE,
   24:  * OR NON-INFRINGEMENT.  PACKET DESIGN DOES NOT WARRANT, GUARANTEE,
   25:  * OR MAKE ANY REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS
   26:  * OF THE USE OF THIS SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY,
   27:  * RELIABILITY OR OTHERWISE.  IN NO EVENT SHALL PACKET DESIGN BE
   28:  * LIABLE FOR ANY DAMAGES RESULTING FROM OR ARISING OUT OF ANY USE
   29:  * OF THIS SOFTWARE, INCLUDING WITHOUT LIMITATION, ANY DIRECT,
   30:  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, PUNITIVE, OR CONSEQUENTIAL
   31:  * DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, LOSS OF
   32:  * USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY THEORY OF
   33:  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   34:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
   35:  * THE USE OF THIS SOFTWARE, EVEN IF PACKET DESIGN IS ADVISED OF
   36:  * THE POSSIBILITY OF SUCH DAMAGE.
   37:  *
   38:  * Author: Archie Cobbs <archie@freebsd.org>
   39:  */
   40: 
   41: #include <sys/types.h>
   42: #include <sys/param.h>
   43: #include <sys/socket.h>
   44: #include <sys/sysctl.h>
   45: #include <sys/sockio.h>
   46: #include <sys/ioctl.h>
   47: 
   48: #include <net/if.h>
   49: #include <net/if_dl.h>
   50: #include <net/if_types.h>
   51: #include <net/route.h>
   52: 
   53: #include <netinet/in.h>
   54: #include <netinet/if_ether.h>
   55: #include <arpa/inet.h>
   56: 
   57: #include <stdlib.h>
   58: #include <unistd.h>
   59: #include <string.h>
   60: #include <assert.h>
   61: #include <errno.h>
   62: #include <time.h>
   63: 
   64: #include "structs/structs.h"
   65: #include "structs/type/array.h"
   66: 
   67: #include "net/if_util.h"
   68: 
   69: /*
   70:  * Internal functions
   71:  */
   72: static int	if_do_ip(const char *iface, int cmd, struct in_addr ip,
   73: 			struct in_addr mask, struct in_addr dest);
   74: 
   75: /*
   76:  * Add an IP address assignment to a broadcast or p2p interface.
   77:  *
   78:  * Returns -1 and sets errno if there was a problem.
   79:  */
   80: int
   81: if_add_ip_addr(const char *iface, struct in_addr ip,
   82: 	struct in_addr mask, struct in_addr dest)
   83: {
   84: 	return (if_do_ip(iface, SIOCAIFADDR, ip, mask, dest));
   85: }
   86: 
   87: /*
   88:  * Remove an IP address assignment from a or p2p broadcast interface.
   89:  *
   90:  * Returns -1 and sets errno if there was a problem.
   91:  */
   92: int
   93: if_del_ip_addr(const char *iface, struct in_addr ip,
   94: 	struct in_addr mask, struct in_addr dest)
   95: {
   96: 	return (if_do_ip(iface, SIOCDIFADDR, ip, mask, dest));
   97: }
   98: 
   99: static int
  100: if_do_ip(const char *iface, int cmd, struct in_addr ip,
  101: 	struct in_addr mask, struct in_addr dest)
  102: {
  103: 	struct in_addr bcast;
  104: 	const struct in_addr *ips[] = {
  105: 		&ip,
  106: 		&mask,
  107: 		&bcast
  108: 	};
  109: 	struct ifaliasreq ifa;
  110: 	struct sockaddr_in *const sas[] = {
  111: 		(struct sockaddr_in *)(void *)&ifa.ifra_addr,
  112: 		(struct sockaddr_in *)(void *)&ifa.ifra_mask,
  113: 		(struct sockaddr_in *)(void *)&ifa.ifra_broadaddr
  114: 	};
  115: 	int sock;
  116: 	int rtn;
  117: 	int i;
  118: 
  119: 	/* Set up broadcast/point2point destination */
  120: 	if (dest.s_addr == 0)
  121: 		bcast.s_addr = ip.s_addr | ~mask.s_addr;
  122: 	else
  123: 		bcast = dest;
  124: 
  125: 	/* Set up message */
  126: 	memset(&ifa, 0, sizeof(ifa));
  127: 	strncpy(ifa.ifra_name, iface, sizeof(ifa.ifra_name));
  128: 	for (i = 0; i < 3; i++) {
  129: 		struct sockaddr_in *const sin = sas[i];
  130: 
  131: 		memset(sin, 0, sizeof(*sin));
  132: 		sin->sin_family = AF_INET;
  133: 		sin->sin_len = sizeof(*sin);
  134: 		sin->sin_addr = *ips[i];
  135: 	}
  136: 
  137: 	/* Send message */
  138: 	if ((sock = socket(PF_INET, SOCK_DGRAM, 0)) == -1)
  139: 		return (-1);
  140: 	rtn = ioctl(sock, cmd, &ifa);
  141: 	(void)close(sock);
  142: 
  143: 	/* Done */
  144: 	return (rtn);
  145: }
  146: