greenplumn main 源码
greenplumn main 代码
文件路径：/gpMgmt/bin/ifaddrs/main.c
/*
* ifaddrs - prints the routable IP addresses for all interfaces on the local
* system. Link-local addresses are never printed.
*
* Options:
* --no-loopback: suppresses output for loopback interfaces
*/
#include <arpa/inet.h>
#include <getopt.h>
#include <ifaddrs.h>
#include <net/if.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <stdbool.h>
int main(int argc, char *argv[])
{
struct ifaddrs *list;
int err;
int c;
/* Options */
int no_loopback = 0;
struct option opts[] = {
{"no-loopback", no_argument, &no_loopback, 1},
{ NULL },
};
while ((c = getopt_long(argc, argv, "", opts, NULL)) != -1)
{
switch (c)
{
case 0:
/* flag assignment already handled */
break;
default:
fprintf(stderr, "usage: %s [--no-loopback]\n", argv[0]);
return 1;
}
}
err = getifaddrs(&list);
if (err)
{
perror("getifaddrs");
return 1;
}
for (; list; list = list->ifa_next)
{
const void *netaddr; /* the address to be converted to a string */
char addrbuf[INET6_ADDRSTRLEN];
const char *addrstr;
struct sockaddr_in *addr4;
struct sockaddr_in6 *addr6;
struct sockaddr *addr = list->ifa_addr;
bool exclude_loopback = (no_loopback && (list->ifa_flags & IFF_LOOPBACK));
if (addr == NULL)
continue;
switch (addr->sa_family)
{
case AF_INET:
addr4 = (struct sockaddr_in *) addr;
/* Exclude 127.0.0.0/8 ip range */
if (exclude_loopback)
{
uint32_t saddr = ntohl(addr4->sin_addr.s_addr);
uint8_t b1;
b1 = (uint8_t)(saddr >> 24 & 0xff);
if (b1 == 127)
continue;
}
netaddr = &addr4->sin_addr;
break;
case AF_INET6:
addr6 = (struct sockaddr_in6 *) addr;
if (addr6->sin6_scope_id)
{
/* Don't print out link-local addresses. */
continue;
}
/* Exclude ::1 */
if (exclude_loopback && IN6_IS_ADDR_LOOPBACK(&addr6->sin6_addr))
continue;
netaddr = &addr6->sin6_addr;
break;
default:
/* we only care about IPv4/6 */
continue;
}
/* Convert the address to a human-readable string */
addrstr = inet_ntop(addr->sa_family, netaddr, addrbuf, sizeof(addrbuf));
if (!addrstr)
{
perror("inet_ntop");
return 1;
}
printf("%s\n", addrstr);
}
return 0;
}
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