Objective-C : Wie Holen Sie die router-Adresse?

Hier ist etwas code, den ich schrieb zu finden, die Routen für die Maschine. Kopiert habe ich die system-Aufrufe aus dem code für netstat. Beachten Sie, dass ich mich stark abgeraten, dies zu tun, da diese Systemaufrufe sind nicht eine unterstützte API und können sich jederzeit ändern. Sie empfohlen, dass ich nur zum Parsen der Ausgabe von netstat.

CustomRoute.c:

#import "CustomRoute.h"
@implementation CustomRoute

+ (NSMutableArray*) getRoutes
{
    NSMutableArray* routeArray = [NSMutableArray array];
    CustomRoute* route = nil;

    size_t needed;
    int mib[6];
    char *buf, *next, *lim;
    register struct rt_msghdr2 *rtm;

    mib[0] = CTL_NET;
    mib[1] = PF_ROUTE;
    mib[2] = 0;
    mib[3] = 0;
    mib[4] = NET_RT_DUMP2;
    mib[5] = 0;

    if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
        err(1, "sysctl: net.route.0.0.dump estimate");
    }

    if ((buf = malloc(needed)) == 0) {
        err(2, "malloc(%lu)", (unsigned long)needed);
    }
    if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
        err(1, "sysctl: net.route.0.0.dump");
    }

    lim  = buf + needed;

    for (next = buf; next < lim; next += rtm->rtm_msglen) {
        rtm = (struct rt_msghdr2 *)next;
        route = [self getRoute:rtm];
        if(route != nil)
        {
            [routeArray addObject:route];
        }
    }
    free(buf);
    printf("Total routes: %u\n",    [routeArray count]);
    return routeArray;
}


+ (CustomRoute*) getRoute:(struct rt_msghdr2 *)rtm
{
    //sockaddrs are after the message header
    struct sockaddr* dst_sa = (struct sockaddr *)(rtm + 1);

    CustomRoute* route = nil;

    if(rtm->rtm_addrs & RTA_DST)
    {
        switch(dst_sa->sa_family)
        {
            case AF_INET:
                if(dst_sa->sa_family == AF_INET && !((rtm->rtm_flags & RTF_WASCLONED) && (rtm->rtm_parentflags & RTF_PRCLONING)))
                {
                    route = [[CustomRoute alloc] initWithRtm:rtm];
                }
            break;

        }
    }

    return route;
}

-(void) setAddr:(struct sockaddr*)sa index:(int)rtax_index
{
    if(rtax_index >= 0 && rtax_index < RTAX_MAX)
    {
        memcpy(&(m_addrs[rtax_index]), sa, sizeof(struct sockaddr));
    }

}

-(NSString*) getDestination
{
    return [self getAddrStringByIndex:RTAX_DST];
}

-(NSString*) getNetmask
{
    return [self getAddrStringByIndex:RTAX_NETMASK];
}

-(NSString*) getGateway
{
    return [self getAddrStringByIndex:RTAX_GATEWAY];
}

-(NSString*) getDetails
{
    NSMutableString* result = [[NSMutableString alloc] init];
    [result appendFormat: [NSString stringWithFormat: @"message type: 0x%06x\n", m_rtm.rtm_type]];
    [result appendFormat: [NSString stringWithFormat: @"flags: 0x%06x\n", m_rtm.rtm_flags]];
    [result appendFormat: [NSString stringWithFormat: @"addrs: 0x%06x\n", m_rtm.rtm_addrs]];


    return result;
}


-initWithRtm: (struct rt_msghdr2*) rtm
{
    int i;
    struct sockaddr* sa = (struct sockaddr*)(rtm + 1);


    //copy over the route message
    memcpy(&(m_rtm), rtm, sizeof(struct rt_msghdr2));
    for(i = 0; i < RTAX_MAX; i++)
    {
        [self setAddr:&(sa[i]) index:i];
    }
    return self;
}

- init
{
    memset(m_addrs, 0, sizeof(m_addrs));
    return self;
}

@end


@implementation CustomRoute (Private)

-(NSString*) getAddrStringByIndex: (int)rtax_index
{
    NSString * routeString = nil;
    struct sockaddr* sa = &(m_addrs[rtax_index]);
    int flagVal = 1 << rtax_index;

    if(!(m_rtm.rtm_addrs & flagVal))
    {
        return @"none";
    }


    if(rtax_index >= 0 && rtax_index < RTAX_MAX)
    {
        switch(sa->sa_family)
        {
            case AF_INET:
            {
                struct sockaddr_in* si = (struct sockaddr_in *)sa;
                if(si->sin_addr.s_addr == INADDR_ANY)
                    routeString = @"default";
                else
                    routeString = [NSString stringWithCString:(char *)inet_ntoa(si->sin_addr) encoding:NSASCIIStringEncoding];
            }
            break;

            case AF_LINK:
                {
                    struct sockaddr_dl* sdl = (struct sockaddr_dl*)sa;
                    if(sdl->sdl_nlen + sdl->sdl_alen + sdl->sdl_slen == 0)
                    {
                        routeString = [NSString stringWithFormat: @"link #%d", sdl->sdl_index];
                    }
                    else
                        routeString = [NSString stringWithCString:link_ntoa(sdl) encoding:NSASCIIStringEncoding];
                }
            break;

            default:
                {
                    char a[3 * sa->sa_len];
                    char *cp;
                    char *sep = "";
                    int i;

                    if(sa->sa_len == 0)
                    {
                        routeString = @"empty";
                    }
                    else
                    {
                        a[0] = (char)NULL;
                        for(i = 0, cp = a; i < sa->sa_len; i++)
                        {
                            cp += sprintf(cp, "%s%02x", sep, (unsigned char)sa->sa_data[i]);
                            sep = ":";
                        }
                        routeString = [NSString stringWithCString:a encoding:NSASCIIStringEncoding];
                    }
                }
        }
    }
    return routeString;
}

@end

CustomRoute.h:

#import <Cocoa/Cocoa.h>
#import <net/route.h>
#import <sys/socket.h>
#import <netinet/in.h>
#import <net/if_dl.h>
#import <sys/sysctl.h>

@interface CustomRoute : NSObject {
    struct sockaddr     m_addrs[RTAX_MAX];
    struct rt_msghdr2   m_rtm;
    int                 m_len;      /* length of the sockaddr array */
}

+ (NSMutableArray*) getRoutes;
+ (CustomRoute*) getRoute:(struct rt_msghdr2 *)rtm;

- (void) setAddr:(struct sockaddr*)sa index:(int)rtax_index;

- (NSString*) getDestination;
- (NSString*) getNetmask;
- (NSString*) getGateway;
- initWithRtm: (struct rt_msghdr2*) rtm;


@end