Attachment 188889 Details for Bug 224079 – Program to demonstrate getifaddr(3) behavior

Program to demonstrate getifaddr(3) behavior

gifa.c (text/plain), 2.92 KB, created by John W. O'Brien on 2017-12-16 19:34:37 UTC

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Creator: John W. O'Brien

Created: 2017-12-16 19:34:37 UTC

Size: 2.92 KB

patch

obsolete

>/*
>Copyright 2017 John W. O'Brien <john@saltant.com>
>
>Redistribution and use in source and binary forms, with or without
>modification, are permitted provided that the following conditions are
>met:
>
>1. Redistributions of source code must retain the above copyright
>notice, this list of conditions and the following disclaimer.
>
>2. Redistributions in binary form must reproduce the above copyright
>notice, this list of conditions and the following disclaimer in the
>documentation and/or other materials provided with the distribution.
>
>THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
>IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
>TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
>PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
>HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
>SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
>TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
>LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
>NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
>SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>*/
>
>#include <stdio.h>
>#include <ifaddrs.h>
>#include <sys/types.h>
>#include <sys/socket.h>
>#include <netinet/in.h>
>#include <arpa/inet.h>
>#include <net/if.h>
>#include <string.h>
>
>/*
>    This program is intended to demonstrate that the inet6 scope ID
>    should only be set to the interface index ID when the address
>    is a scoped address.
>
>    Usage: gifa [<iface>]
>*/
>
>int
>main(int argc, char *argv[]) {
>    struct ifaddrs *ifap, *cur;
>    char addr[INET6_ADDRSTRLEN];
>    void *ia;
>    int have_scope;
>    uint32_t scope;
>
>    getifaddrs(&ifap);
>    printf("%-5s %-10s %3s %-*s %5s %5s\n",
>        "iface", "flags", "af", INET6_ADDRSTRLEN,
>        "addr", "scope", "ifidx"
>    );
>
>    for (cur = ifap; NULL != cur; cur = cur->ifa_next) {
>
>        if (argc > 1 && strncmp(cur->ifa_name, argv[1], IFNAMSIZ))
>            continue;
>
>        ia = NULL;
>        addr[0] = '\0';
>        have_scope = 0;
>
>        if (cur->ifa_addr->sa_family == AF_INET) {
>            ia = &((struct sockaddr_in *)cur->ifa_addr)->sin_addr;
>        }
>        else if (cur->ifa_addr->sa_family == AF_INET6) {
>            ia = &((struct sockaddr_in6 *)cur->ifa_addr)->sin6_addr;
>            scope = ((struct sockaddr_in6 *)cur->ifa_addr)->sin6_scope_id;
>            have_scope = 1;
>        }
>
>        if (ia)
>            inet_ntop(cur->ifa_addr->sa_family,
>                ia, addr, INET6_ADDRSTRLEN);
>
>        printf("%-5s 0x%08x %3d %-*s %5d %5d\n",
>            cur->ifa_name,
>            cur->ifa_flags,
>            cur->ifa_addr->sa_family,
>            INET6_ADDRSTRLEN,
>            addr,
>            have_scope ? scope : -1,
>            if_nametoindex(cur->ifa_name)
>        );
>    }
>    freeifaddrs(ifap);
>    return 0;
>}

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Attachments on bug 224079: 188887 | 188888 | 188889 | 188890