Annotation of embedaddon/libpdel/net/if_ip.c, revision 1.1
1.1 ! misho 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:
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