components/ip.c

   1 /* See LICENSE file for copyright and license details. */
   2 #if defined(__OpenBSD__)
   3 #include <sys/types.h>
   4 #include <sys/socket.h>
   5 #endif
   6
   7 #include <errno.h>
   8 #include <ifaddrs.h>
   9 #include <netdb.h>
  10 #include <stdio.h>
  11 #include <string.h>
  12
  13 #include "../util.h"
  14
  15 const char *
  16 ipv4(const char *iface)
  17 {
  18         struct ifaddrs *ifaddr, *ifa;
  19         int s;
  20         char host[NI_MAXHOST];
  21
  22         if (getifaddrs(&ifaddr) == -1) {
  23                 fprintf(stderr, "getifaddrs: %s\n", strerror(errno));
  24                 return NULL;
  25         }
  26
  27         for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
  28                 if (ifa->ifa_addr == NULL) {
  29                         continue;
  30                 }
  31                 s = getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in), host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
  32                 if ((strcmp(ifa->ifa_name, iface) == 0) && (ifa->ifa_addr->sa_family == AF_INET)) {
  33                         if (s != 0) {
  34                                 fprintf(stderr, "getnameinfo: %s\n", gai_strerror(s));
  35                                 return NULL;
  36                         }
  37                         return bprintf("%s", host);
  38                 }
  39         }
  40
  41         freeifaddrs(ifaddr);
  42
  43         return NULL;
  44 }
  45
  46 const char *
  47 ipv6(const char *iface)
  48 {
  49         struct ifaddrs *ifaddr, *ifa;
  50         int s;
  51         char host[NI_MAXHOST];
  52
  53         if (getifaddrs(&ifaddr) == -1) {
  54                 fprintf(stderr, "getifaddrs: %s\n", strerror(errno));
  55                 return NULL;
  56         }
  57
  58         for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
  59                 if (ifa->ifa_addr == NULL) {
  60                         continue;
  61                 }
  62                 s = getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in6), host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
  63                 if ((strcmp(ifa->ifa_name, iface) == 0) && (ifa->ifa_addr->sa_family == AF_INET6)) {
  64                         if (s != 0) {
  65                                 fprintf(stderr, "getnameinfo: %s\n", gai_strerror(s));
  66                                 return NULL;
  67                         }
  68                         return bprintf("%s", host);
  69                 }
  70         }
  71
  72         freeifaddrs(ifaddr);
  73
  74         return NULL;
  75 }