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Improve address type error handling

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This patch detects numeric address types to avoid unnecessary
warnings/errors.  It also cleans up error printing to not print error
messages on stderr in the deamon case.

Signed-off-by: Karsten Keil <kkeil@suse.de>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Karsten Keil 2008-07-31 13:18:11 +02:00 • committed by H. Peter Anvin
parent bdb90cf176
commit 18fd18bd5c
4 changed files with 56 additions and 20 deletions
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57
tftpd/tftpd.c
View file

@ -258,23 +258,36 @@ static int recv_time(int s, void *rbuf, int len, unsigned int flags,
static int split_port(char **ap, char **pp)
{
char *a, *p;
int ret = AF_UNSPEC;
a = *ap;
#ifdef HAVE_IPV6
if (is_numeric_ipv6(a)) {
if (*a++ != '[')
return 1;
return -1;
*ap = a;
p = strrchr(a, ']');
if (!p)
return 1;
return -1;
*p++ = 0;
a = p;
ret = AF_INET6;
p = strrchr(a, ':');
if (p)
*p++ = 0;
} else
#endif
{
struct in_addr in;
p = strrchr(a, ':');
if (p)
*p++ = 0;
if (inet_aton(a, &in))
ret = AF_INET;
}
p = strrchr(a, ':');
if (p)
*p++ = 0;
*pp = p;
return 0;
return ret;
}
enum long_only_options {
@ -542,7 +555,26 @@ int main(int argc, char **argv)
address = tfstrdup(address);
err = split_port(&address, &portptr);
if (err) {
switch (err) {
case AF_INET:
#ifdef HAVE_IPV6
if (fd6 >= 0) {
close(fd6);
fd6 = -1;
ai_fam = AF_INET;
}
break;
case AF_INET6:
if (fd4 >= 0) {
close(fd4);
fd4 = -1;
ai_fam = AF_INET6;
}
break;
#endif
case AF_UNSPEC:
break;
default:
syslog(LOG_ERR,
"Numeric IPv6 addresses need to be enclosed in []");
exit(EX_USAGE);
@ -556,8 +588,8 @@ int main(int argc, char **argv)
(union sock_addr *)&bindaddr4, NULL);
if (err) {
syslog(LOG_ERR,
"cannot resolve local IPv4 bind address: %s",
address);
"cannot resolve local IPv4 bind address: %s, %s",
address, gai_strerror(err));
exit(EX_NOINPUT);
}
}
@ -570,13 +602,14 @@ int main(int argc, char **argv)
if (fd4 >= 0) {
syslog(LOG_ERR,
"cannot resolve local IPv6 bind address: %s"
"; using IPv4 only", address);
"(%s); using IPv4 only",
address, gai_strerror(err));
close(fd6);
fd6 = -1;
} else {
syslog(LOG_ERR,
"cannot resolve local IPv6 bind address: %s",
address);
"cannot resolve local IPv6 bind address: %s"
"(%s)", address, gai_strerror(err));
exit(EX_NOINPUT);
}
}