[DragonFlyBSD - Bug #1897] SIOCGIFADDR doesn't work

[Raimundo Santos via Redmine <bugtracker-admin@xxxxxxxxxxxxxxxxxxxxx>]

Issue #1897 has been updated by Raimundo Santos.

Description updated

I had the same issue here, detected while trying do run the NO-IP daemon. It works fine under FreeBSD, so I thinked that it should work too under DragonFlyBSD. 

I took this as a solution:

(based on the test posted by Steve)
(basically bypass the ioctl and use getifaddrs(3) - is, therefore, SIOGIFADDR and the like deprecated?!)

#include <stdio.h>
#include <stdlib.h>
#include <string.h>


#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <ifaddrs.h>

int main (int argc, char **argv) {
        struct ifaddrs *ifa = NULL;
        char inaddr[INET_ADDRSTRLEN];

         if(getifaddrs(&ifa) != 0) {
                printf("Error while trying to get ifaddrs...\n");
                exit(1);
        }

        while(ifa) {
            inet_ntop(AF_INET, (struct in_addr *)&((struct sockaddr_in *)ifa->ifa_addr)->sin_addr, inaddr, INET_ADDRSTRLEN);
            printf("Dev: %s IP %s --> %d\n", ifa->ifa_name, inaddr, ifa->ifa_addr->sa_family);
            ifa = ifa->ifa_next;
        }

        freeifaddrs(ifa);

        return(0);
}

Now, working on the NO-IP patch.
----------------------------------------
Bug #1897: SIOCGIFADDR doesn't work
http://bugs.dragonflybsd.org/issues/1897

Author: Steve O'Hara-Smith
Status: New
Priority: Normal
Assignee: 
Category: 
Target version: 


Hi,

	I found this while trying to get ushare to work - the SIOCGIFADDR
ioctl doesn't set the IP address (at least for re devices), what you get is
whatever was in the struct ifreq before the call.

	Running v2.9.0.105.gba1cb-DEVELOPMENT - but it's been going on for
a while I just haven't got to the bottom of the problem until now.

	My test code (below) always prints 0.

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <net/if_dl.h>
#include <net/if.h>
#include <sys/ioctl.h>
#include <netinet/in.h>

int main (int argc, char **argv)
{
        int sock;
        int32_t ip;
        struct ifreq ifr;

        memset (&ifr, 0, sizeof ifr);
        sock = socket (AF_INET, SOCK_STREAM, 0);
        if (sock < 0) {
                perror ("socket");
                exit(1);
        }

        strcpy(ifr.ifr_name, "re0");
        ifr.ifr_addr.sa_family = AF_INET;
        if (ioctl (sock, SIOCGIFADDR, &ifr) < 0) {
                perror("ioctl");
                exit(1);
        }
        ip = ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr;
        printf("%x\n", ip);
}


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