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Annotation of embedaddon/libpdel/net/if_ip.c, revision 1.1.1.1

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: