获取以太网指定IP地址的函数:
char *get_ethernet_ip(const char *ethernet, char *ip, size_t len) {
struct ifaddrs *ips;
int rc = getifaddrs(&ips);
if (rc == -1) {
SYSLOG("getifaddrs() failed (%s)", strerror(errno));
return NULL;
}
for (; ips != NULL; ips = ips->ifa_next) {
if (strcasecmp(ethernet, ips->ifa_name) == 0) {
in_addr local_ip = ((sockaddr_in *)ips->ifa_addr)->sin_addr;
const char *p = inet_ntop(AF_INET, &local_ip, ip, len);
if (p == NULL) {
SYSLOG("inet_ntop() failed (%s)", strerror(errno));
return NULL;
}
return ip;
}
}
return NULL;
}
主要用于:
char ip[32];
SYSLOG("ethernet lo ip: %s", get_ethernet_ip("lo", ip, 32));
SYSLOG("ethernet eth0 ip: %s", get_ethernet_ip("eth0", ip, 32));
Result:
[ 2016-10-26 04:37:52 UTC ] [ server_info.cpp:90 ] [ main ] 以太网 lo ip: 1.0.0.0
[ 2016-10-26 04:37:52 UTC ] [ server_info.cpp:91 ] [ main ] 以太网 eth0 ip: 2.0.0.0
问题:
ip 为lo
应该127.0.0.1
,并且对于eth0
它不应该是2.0.0.0
, 我对吗?