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Patch to get hardware address on FreeBSD and OpenBSD from Nicolas Bernard

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<n.bernard@worldonline.fr>

Here is a patch which uses sysctl to get the hardware address. I tried
it on FreeBSD 5.3 and OpenBSD 3.5. Note that I don't know how this code
work on an non-ethernet interface (tried on some pseudo-interface and
get an all-0 address, but...).

I left the code in the get_addrs_ioctl fct despite the fact it uses
sysctl because it was simpler.

Oh yes, I used gotos, I found them more readable in this case than
deeply imbricated ifs.
This commit is contained in:
pdw
2005-05-03 20:14:53 +00:00
parent 65726d562a
commit 44206c8a75
1 changed files with 40 additions and 0 deletions
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40
addrs_ioctl.c
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@@ -18,6 +18,12 @@
#include <net/if.h> #include <net/if.h>
#include <netinet/in.h> #include <netinet/in.h>
#if defined __FreeBSD__ || defined __OpenBSD__
#include <sys/param.h>
#include <sys/sysctl.h>
#include <net/if_dl.h>
#endif
#include "iftop.h" #include "iftop.h"
/* /*
@@ -64,8 +70,42 @@ get_addrs_ioctl(char *interface, char if_hw_addr[], struct in_addr *if_ip_addr)
memcpy(if_hw_addr, ifr.ifr_hwaddr.sa_data, 6); memcpy(if_hw_addr, ifr.ifr_hwaddr.sa_data, 6);
got_hw_addr = 1; got_hw_addr = 1;
} }
#else
#if defined __FreeBSD__ || defined __OpenBSD__
{
int sysctlparam[6] = {CTL_NET, PF_ROUTE, 0, 0, NET_RT_IFLIST, 0};
int needed = 0;
char *buf = NULL;
struct if_msghdr *msghdr = NULL;
sysctlparam[5] = if_nametoindex(interface);
if (sysctlparam[5] == 0) {
fprintf(stderr, "Error getting hardware address for interface: %s\n", interface);
goto ENDHWADDR;
}
if (sysctl(sysctlparam, 6, NULL, &needed, NULL, 0) < 0) {
fprintf(stderr, "Error getting hardware address for interface: %s\n", interface);
goto ENDHWADDR;
}
if ((buf = malloc(needed)) == NULL) {
fprintf(stderr, "Error getting hardware address for interface: %s\n", interface);
goto ENDHWADDR;
}
if (sysctl(sysctlparam, 6, buf, &needed, NULL, 0) < 0) {
fprintf(stderr, "Error getting hardware address for interface: %s\n", interface);
free(buf);
goto ENDHWADDR;
}
msghdr = (struct if_msghdr *) buf;
memcpy(if_hw_addr, LLADDR((struct sockaddr_dl *)(buf + sizeof(struct if_msghdr) - sizeof(struct if_data) + sizeof(struct if_data))), 6);
free(buf);
got_hw_addr = 1;
ENDHWADDR:
1; /* compiler whines if there is a label at the end of a block...*/
}
#else #else
fprintf(stderr, "Cannot obtain hardware address on this platform\n"); fprintf(stderr, "Cannot obtain hardware address on this platform\n");
#endif
#endif #endif
/* Get the IP address of the interface */ /* Get the IP address of the interface */