iOS ARC build - find local interface after acceptOnPort
whitehexagon
looking at the code logic on the above method, there doesn't seem to
be any way to achieve this. The first time I have a valid localHost
is after the first connect...
So is the only way to achieve this to do a dummy local connect to
0.0.0.0:port?
btw thanks for 'encouraging' me to go with ARC :) and a big thanks for
a great lib, been using it for over a year in a number of my apps.
whitehexagon
know my LAN IP address in iOS, sounds like I'm gonna need something
based around getifaddrs. Sorry for the noise. Peter
Joe Francia
getifaddrs() is indeed the ticket. This will print your hostname and en* IP address(es). You can modify it to do something else with them, if you'd like.
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netdb.h>
#include <ifaddrs.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
-(void)printIPAddresses {
struct ifaddrs *ifaddr, *ifa;
int family, s;
char host[NI_MAXHOST];
char hostname[NI_MAXHOST];
if (getifaddrs(&ifaddr) == -1) {
perror("getifaddrs");
}
if(!gethostname(hostname, NI_MAXHOST)) {
printf("Hostname: %s\n", hostname);
}
for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
if (ifa->ifa_addr == NULL)
continue;
family = ifa->ifa_addr->sa_family;
if (family == AF_INET || family == AF_INET6) {
s = getnameinfo(ifa->ifa_addr,
(family == AF_INET) ? sizeof(struct sockaddr_in) :
sizeof(struct sockaddr_in6),
host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
if (s != 0) {
DDLogError(@"getnameinfo() failed: %s", gai_strerror(s));
}
//only print the ethernet/wifi interface (en*), not loopback, 3g or vpn
if (strncmp(ifa->ifa_name, "en", 2) == 0) {
printf("address: %s\n", host);
}
}
}
freeifaddrs(ifaddr);
}
Joe Francia
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