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Introduce netdev_check_if_exists to check if interface exists #9

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Introduce netdev_check_if_exists to check if interface exists #9

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20 changes: 20 additions & 0 deletions linux/netdev.c
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@
#include <netinet/in.h>
#include <unistd.h>
#include <err.h>
#include <ifaddrs.h>

#include "netdev.h"
#include "platform.h"
Expand Down Expand Up @@ -146,3 +147,22 @@ bool netdev_set_up_promisc(const char *const ifname, bool up, bool promisc)
close(fd);
return true;
}

bool netdev_check_if_exists(const char *const ifname)
{
struct ifaddrs *ifaddr, *ifa;
bool found = false;

if (getifaddrs(&ifaddr) == -1) {
LOG_WARN("can not check interface names, continuing");
return true;
}
for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
if (strcmp(ifa->ifa_name, ifname) == 0) {
found = true;
break;
}
}
freeifaddrs(ifaddr);
return found;
}
2 changes: 2 additions & 0 deletions linux/netdev.h
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Original file line number Diff line number Diff line change
Expand Up @@ -36,6 +36,8 @@ bool netdev_set_ip_address(const char* ifname, uint32_t ip);

bool netdev_set_up_promisc(const char *const ifname, bool up, bool promisc);

bool netdev_check_if_exists(const char *const ifname);

#ifdef __cplusplus
}
#endif
Expand Down