src/regression/inet_pton-empty-last-field.c

   1 // zero compression for the last field in an ipv6 address is (probably) allowed
   2 // https://tools.ietf.org/html/rfc4291#section-2.2
   3 // but further fields shouldnt buffer overflow
   4 #include <stdio.h>
   5 #include <string.h>
   6 #include <arpa/inet.h>
   7 #include "test.h"
   8
   9 static void txt(char *s, unsigned char *buf)
  10 {
  11         int i;
  12         sprintf(s, "%04x", buf[0]<<8 | buf[1]);
  13         for (i=1; i<8; i++)
  14                 sprintf(s+5*i, ":%04x", buf[2*i]<<8 | buf[2*i+1]);
  15 }
  16
  17 int main(void)
  18 {
  19         char s[50], sw[50];
  20         unsigned char buf[16];
  21         unsigned char want[16] = {0,1,0,2,0,3,0,4,0,5,0,6,0,7,0,0};
  22         char *addr;
  23
  24         addr = "1:2:3:4:5:6:7::";
  25         if (inet_pton(AF_INET6, addr, buf)!=1 || memcmp(buf, want, 16)!=0) {
  26                 txt(s, buf);
  27                 txt(sw, want);
  28                 t_error("inet_pton(%s) returned %s, wanted %s\n",
  29                         addr, s, sw);
  30         }
  31
  32         addr = "1:2:3:4:5:6:7::9:10:11:12:13:14:15:16:17:18:19:20";
  33         if (inet_pton(AF_INET6, addr, buf)!=0) {
  34                 txt(s, buf);
  35                 t_error("inet_pton(%s) returned %s, wanted a failure\n",
  36                         addr, s);
  37         }
  38         return t_status;
  39 }