DragonFlyBSD

Bug #1897

Updated by tuxillo over 10 years ago

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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