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ident.c: add support for IPv6 

Add IPv6 support by implementing name resolution with the
protocol agnostic getaddrinfo(3) API. The old gethostbyname(3)
code is still available when git is compiled with NO_IPV6.

Signed-off-by: Elia Pinto <gitter.spiros@gmail.com>
Helped-by: Jeff King <peff@peff.net>
Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Jeff King <peff@peff.net>
This commit is contained in:
Elia Pinto 2015-11-27 14:08:27 +00:00 committed by Jeff King
parent b05c2f9ed4
commit 00bce77fe5
1 changed files with 27 additions and 4 deletions
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31
ident.c
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@ -70,10 +70,35 @@ static int add_mailname_host(struct strbuf *buf)
return 0;
}
static int canonical_name(const char *host, struct strbuf *out)
{
int status = -1;
#ifndef NO_IPV6
struct addrinfo hints, *ai;
memset (&hints, '\0', sizeof (hints));
hints.ai_flags = AI_CANONNAME;
if (!getaddrinfo(host, NULL, &hints, &ai)) {
if (ai && strchr(ai->ai_canonname, '.')) {
strbuf_addstr(out, ai->ai_canonname);
status = 0;
}
freeaddrinfo(ai);
}
#else
struct hostent *he = gethostbyname(buf);
if (he && strchr(he->h_name, '.')) {
strbuf_addstr(out, he->h_name);
status = 0;
}
#endif /* NO_IPV6 */
return status;
}
static void add_domainname(struct strbuf *out)
{
char buf[1024];
struct hostent *he;
if (gethostname(buf, sizeof(buf))) {
warning("cannot get host name: %s", strerror(errno));
@ -82,9 +107,7 @@ static void add_domainname(struct strbuf *out)
}
if (strchr(buf, '.'))
strbuf_addstr(out, buf);
else if ((he = gethostbyname(buf)) && strchr(he->h_name, '.'))
strbuf_addstr(out, he->h_name);
else
else if (canonical_name(buf, out) < 0)
strbuf_addf(out, "%s.(none)", buf);
}