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Make -L work without root on Linux

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This commit is contained in:
Joseph C. Lehner 2016-02-09 09:39:55 +01:00
parent 417345b031
commit 8b0251e7e1
1 changed files with 24 additions and 8 deletions
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32
ethsock.c
View file

@ -13,8 +13,10 @@
#include <pcap.h>
#include <ifaddrs.h>
#if defined(NMRPFLASH_LINUX)
#define NMRPFLASH_AF_ETHERNET AF_PACKET
#include <linux/if_packet.h>
#elif defined (NMRPFLASH_OSX)
#define NMRPFLASH_AF_ETHERNET AF_LINK
#include <net/if_dl.h>
#endif
#endif
@ -71,15 +73,12 @@ static bool get_hwaddr(uint8_t *hwaddr, const char *intf)
for (ifa = ifas; ifa; ifa = ifa->ifa_next) {
if (!strcmp(ifa->ifa_name, intf)) {
#ifdef NMRPFLASH_LINUX
if (ifa->ifa_addr->sa_family != AF_PACKET) {
if (ifa->ifa_addr->sa_family != NMRPFLASH_AF_ETHERNET) {
continue;
}
#ifdef NMRPFLASH_LINUX
src = ((struct sockaddr_ll*)ifa->ifa_addr)->sll_addr;
#else
if (ifa->ifa_addr->sa_family != AF_LINK) {
continue;
}
src = LLADDR((struct sockaddr_dl*)ifa->ifa_addr);
#endif
memcpy(hwaddr, src, 6);
@ -432,13 +431,30 @@ inline int ethsock_set_timeout(struct ethsock *sock, unsigned msec)
return 0;
}
static bool is_ethernet(const char *intf)
static bool is_ethernet(const pcap_if_t *dev)
{
pcap_t *pcap;
pcap_addr_t *addr;
int i;
char errbuf[PCAP_ERRBUF_SIZE];
bool ret = false;
if ((pcap = pcap_create(intf, errbuf))) {
for (addr = dev->addresses; addr; addr = addr->next) {
if (verbosity > 1) {
printf("%s: sa_family=%d, sa_data={ ", dev->name,
addr->addr->sa_family);
for (i = 0; i != sizeof(addr->addr->sa_data); ++i) {
printf("%02x ", addr->addr->sa_data[i] & 0xff);
}
printf("}\n");
}
if (addr->addr->sa_family == NMRPFLASH_AF_ETHERNET) {
return true;
}
}
if ((pcap = pcap_create(dev->name, errbuf))) {
if (pcap_activate(pcap) == 0) {
ret = (pcap_datalink(pcap) == DLT_EN10MB);
}
@ -472,7 +488,7 @@ int ethsock_list_all(void)
continue;
}
if (!is_ethernet(dev->name)) {
if (!is_ethernet(dev)) {
if (verbosity) {
printf("%-15s (not an ethernet device)\n",
dev->name);