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add sk_interface_addr for getting an interface's IP

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This commit is contained in:
Geoff Salmon 2013-01-08 19:21:26 -05:00 committed by Richard Cochran
parent d6779889cc
commit f3ac2cad65
2 changed files with 48 additions and 0 deletions
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38
sk.c
View File

@ -26,6 +26,8 @@
#include <string.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <ifaddrs.h>
#include <stdlib.h>
#include "print.h"
#include "sk.h"
@ -158,6 +160,42 @@ int sk_interface_macaddr(char *name, unsigned char *mac, int len)
return 0;
}
int sk_interface_addr(char *name, int family, uint8_t *addr, int len)
{
struct ifaddrs *ifaddr, *i;
int copy_len, result = -1;
void *copy_from;
if (getifaddrs(&ifaddr) == -1) {
pr_err("getifaddrs failed: %m");
return -1;
}
for (i = ifaddr; i; i = i->ifa_next) {
if (i->ifa_addr && family == i->ifa_addr->sa_family &&
strcmp(name, i->ifa_name) == 0)
{
switch (family) {
case AF_INET:
copy_len = 4;
copy_from = &((struct sockaddr_in *)i->ifa_addr)->sin_addr.s_addr;
break;
case AF_INET6:
copy_len = 16;
copy_from = &((struct sockaddr_in6 *)i->ifa_addr)->sin6_addr.s6_addr;
break;
default:
continue;
}
if (copy_len > len)
copy_len = len;
memcpy(addr, copy_from, copy_len);
result = copy_len;
break;
}
}
free(ifaddr);
return result;
}
int sk_receive(int fd, void *buf, int buflen,
struct hw_timestamp *hwts, int flags)
{

10
sk.h
View File

@ -63,6 +63,16 @@ int sk_get_ts_info(char *name, struct sk_ts_info *sk_info);
*/
int sk_interface_macaddr(char *name, unsigned char *mac, int len);
/**
* Obtains the first IP address assigned to a network interface.
* @param name The name of the interface
* @param family The family of the address to get: AF_INET or AF_INET6
* @param addr Buffer to hold the result
* @param len Length of 'addr'
* @return The number of bytes written to addr on success, -1 otherwise.
*/
int sk_interface_addr(char *name, int family, uint8_t *addr, int len);
/**
* Read a message from a socket.
* @param fd An open socket.