On Wed, 9 Feb 2005, Jochen Witte wrote:
> Hello,
>
> I would like to get a list of all my current ip-adresses in a C program.
> How do I do this? Do I really have to use ioctl? Or is there something
> simple/portable out there?
Something like this:
#include <sys/types.h>
#include <sys/socket.h>
#include <ifaddrs.h>
#include <net/if.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "libinet6/debug.h"
int debug_sockaddr(int family, const struct sockaddr *sockaddr) {
int maxlen;
void *addr;
char addr_str[INET6_ADDRSTRLEN+1];
switch (family) {
case AF_INET:
maxlen = INET_ADDRSTRLEN;
addr = &(((struct sockaddr_in *) sockaddr)->sin_addr);
break;
case AF_INET6:
maxlen = INET6_ADDRSTRLEN;
addr = &(((struct sockaddr_in6 *) sockaddr)->sin6_addr);
break;
default:
maxlen = 0;
}
if (!inet_ntop(family, addr, addr_str, maxlen)) {
printf(stderr, "inet_ntop");
return -1;
}
printf("%s\n", addr_str);
return 0;
}
int main(int argc,char *argv[]) {
struct ifaddrs *g_ifaces = NULL, *g_iface;
struct if_nameindex *i_ifaces = NULL, *i_iface;
int err = 0;
char *default_str = "<unknown>";
char addr_str[INET6_ADDRSTRLEN+1]; /* Segfault? Alloc this dynamically?x
*/
/* getifaddrs */
err = getifaddrs(&g_ifaces);
if (err) {
fprintf(stderr,"getifaddr failed\n");
goto out;
}
printf("===getifaddrs===\n");
for (g_iface = g_ifaces; g_iface; g_iface = g_iface->ifa_next) {
sa_family_t family = g_iface->ifa_addr->sa_family;
printf("name: %s, family: %d, address: ", g_iface->ifa_name, family);
debug_sockaddr("", family, g_iface->ifa_addr);
}
/* if_nameindex */
printf("===nameindex===\n");
i_ifaces = if_nameindex();
for (i_iface = i_ifaces; i_iface->if_index; i_iface++) {
printf("name: %s index: %d\n", i_iface->if_name, i_iface->if_index);
}
out:
if (g_ifaces)
freeifaddrs(g_ifaces);
if (i_ifaces)
if_freenameindex(i_ifaces);
}
--
Miika Komu [EMAIL PROTECTED] http://www.iki.fi/miika/
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