components/ip.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <errno.h>
   3 #include <ifaddrs.h>
   4 #include <netdb.h>
   5 #include <stdio.h>
   6 #include <string.h>
   7 #if defined(__OpenBSD__)
   8 #include <sys/types.h>
   9 #include <sys/socket.h>
  10 #endif
  11
  12 #include "../util.h"
  13
  14 const char *
  15 ipv4(const char *iface)
  16 {
  17         struct ifaddrs *ifaddr, *ifa;
  18         int s;
  19         char host[NI_MAXHOST];
  20
  21         if (getifaddrs(&ifaddr) == -1) {
  22                 fprintf(stderr, "getifaddrs: %s\n", strerror(errno));
  23                 return NULL;
  24         }
  25
  26         for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
  27                 if (ifa->ifa_addr == NULL) {
  28                         continue;
  29                 }
  30                 s = getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in), host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
  31                 if ((strcmp(ifa->ifa_name, iface) == 0) && (ifa->ifa_addr->sa_family == AF_INET)) {
  32                         if (s != 0) {
  33                                 fprintf(stderr, "getnameinfo: %s\n", gai_strerror(s));
  34                                 return NULL;
  35                         }
  36                         return bprintf("%s", host);
  37                 }
  38         }
  39
  40         freeifaddrs(ifaddr);
  41
  42         return NULL;
  43 }
  44
  45 const char *
  46 ipv6(const char *iface)
  47 {
  48         struct ifaddrs *ifaddr, *ifa;
  49         int s;
  50         char host[NI_MAXHOST];
  51
  52         if (getifaddrs(&ifaddr) == -1) {
  53                 fprintf(stderr, "getifaddrs: %s\n", strerror(errno));
  54                 return NULL;
  55         }
  56
  57         for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
  58                 if (ifa->ifa_addr == NULL) {
  59                         continue;
  60                 }
  61                 s = getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in6), host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
  62                 if ((strcmp(ifa->ifa_name, iface) == 0) && (ifa->ifa_addr->sa_family == AF_INET6)) {
  63                         if (s != 0) {
  64                                 fprintf(stderr, "getnameinfo: %s\n", gai_strerror(s));
  65                                 return NULL;
  66                         }
  67                         return bprintf("%s", host);
  68                 }
  69         }
  70
  71         freeifaddrs(ifaddr);
  72
  73         return NULL;
  74 }