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authorRich Felker <dalias@aerifal.cx>2013-07-25 03:20:02 -0400
committerRich Felker <dalias@aerifal.cx>2013-07-25 03:20:02 -0400
commit1cd417bdf10366d63cc875e285c6418709a58c17 (patch)
tree232d9d35ba1da858c6da35e9513eb6cd3ce4361e /src
parent43d2531316270633589c67cf0c4d6d01e520a397 (diff)
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make inet_ntop format v4-mapped ipv6 addresses properly
based on a patch by orc. POSIX actually fails to specify the format of the ntop conversion; presumably, any output that will correctly round-trip back via the (well-specified) pton operation is acceptable. the new behavior is much more convenient than the old, however. this patch also affects getnameinfo, which is implemented in terms of inet_ntop and which is the preferred interface for performing this conversion. I've also removed some inexplicable cruft (filling the buffer with 'x' before doing anything) whose origin I was unable to track down.
Diffstat (limited to 'src')
-rw-r--r--src/network/inet_ntop.c22
1 files changed, 14 insertions, 8 deletions
diff --git a/src/network/inet_ntop.c b/src/network/inet_ntop.c
index 76ae556c..e9e2823f 100644
--- a/src/network/inet_ntop.c
+++ b/src/network/inet_ntop.c
@@ -18,14 +18,20 @@ const char *inet_ntop(int af, const void *restrict a0, char *restrict s, socklen
return s;
break;
case AF_INET6:
- memset(buf, 'x', sizeof buf);
- buf[sizeof buf-1]=0;
- snprintf(buf, sizeof buf,
- "%x:%x:%x:%x:%x:%x:%x:%x",
- 256*a[0]+a[1],256*a[2]+a[3],
- 256*a[4]+a[5],256*a[6]+a[7],
- 256*a[8]+a[9],256*a[10]+a[11],
- 256*a[12]+a[13],256*a[14]+a[15]);
+ if (memcmp(a, "\0\0\0\0\0\0\0\0\0\0\377\377", 12))
+ snprintf(buf, sizeof buf,
+ "%x:%x:%x:%x:%x:%x:%x:%x",
+ 256*a[0]+a[1],256*a[2]+a[3],
+ 256*a[4]+a[5],256*a[6]+a[7],
+ 256*a[8]+a[9],256*a[10]+a[11],
+ 256*a[12]+a[13],256*a[14]+a[15]);
+ else
+ snprintf(buf, sizeof buf,
+ "%x:%x:%x:%x:%x:%x:%d.%d.%d.%d",
+ 256*a[0]+a[1],256*a[2]+a[3],
+ 256*a[4]+a[5],256*a[6]+a[7],
+ 256*a[8]+a[9],256*a[10]+a[11],
+ a[12],a[13],a[14],a[15]);
/* Replace longest /(^0|:)[:0]{2,}/ with "::" */
for (i=best=0, max=2; buf[i]; i++) {
if (i && buf[i] != ':') continue;