int netsnmp_sockaddr_in6_2 (struct sockaddr_in6 *addr, const char *inpeername, const char *default_target)
{
char *cp = NULL, *peername = NULL;
char debug_addr[INET6_ADDRSTRLEN];
#if HAVE_GETADDRINFO
struct addrinfo *addrs = NULL;
int err;
#elif HAVE_GETIPNODEBYNAME
struct hostent *hp = NULL;
int err;
#elif HAVE_GETHOSTBYNAME
struct hostent *hp = NULL;
#endif
int portno;
if (addr == NULL)
{
return 0;
}
DEBUGMSGTL (("netsnmp_sockaddr_in6",
"addr %p, peername \"%s\", default_target \"%s\"\n",
addr, inpeername ? inpeername : "[NIL]", default_target ? default_target : "[NIL]"));
memset (addr, 0, sizeof (struct sockaddr_in6));
addr->sin6_family = AF_INET6;
addr->sin6_addr = in6addr_any;
addr->sin6_port = htons ((u_short) SNMP_PORT);
{
int port = netsnmp_ds_get_int (NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_DEFAULT_PORT);
if (port != 0)
addr->sin6_port = htons ((u_short) port);
else if (default_target != NULL)
netsnmp_sockaddr_in6_2 (addr, default_target, NULL);
}
if (inpeername != NULL)
{
/*
* Duplicate the peername because we might want to mank around with
* it.
*/
peername = strdup (inpeername);
if (peername == NULL)
{
return 0;
}
for (cp = peername; *cp && isdigit ((unsigned char) *cp); cp++);
portno = atoi (peername);
if (!*cp && portno != 0)
{
/*
* Okay, it looks like JUST a port number.
*/
DEBUGMSGTL (("netsnmp_sockaddr_in6", "totally numeric: %d\n", portno));
addr->sin6_port = htons ((u_short) portno);
goto resolved;
}
/*
* See if it is an IPv6 address covered with square brackets. Also check
* for an appended :port.
*/
if (*peername == '[')
{
cp = strchr (peername, ']');
if (cp != NULL)
{
/*
* See if it is an IPv6 link-local address with interface
* name as <zone_id>, like fe80::1234%eth0.
* Please refer to the internet draft, IPv6 Scoped Address Architecture
* http://www.ietf.org/internet-drafts/draft-ietf-ipngwg-scoping-arch-04.txt
*
*/
char *scope_id;
unsigned int if_index = 0;
*cp = '\0';
scope_id = strchr (peername + 1, '%');
if (scope_id != NULL)
{
*scope_id = '\0';
if_index = netsnmp_if_nametoindex (scope_id + 1);
}
if (*(cp + 1) == ':')
{
portno = atoi (cp + 2);
if (portno != 0 && inet_pton (AF_INET6, peername + 1, (void *) &(addr->sin6_addr)))
{
DEBUGMSGTL (("netsnmp_sockaddr_in6", "IPv6 address with port suffix :%d\n", portno));
if (portno > 0 && portno < 0xffff)
{
addr->sin6_port = htons ((u_short) portno);
}
else
{
DEBUGMSGTL (("netsnmp_sockaddr_in6", "invalid port number: %d", portno));
return 0;
}
#if defined(HAVE_STRUCT_SOCKADDR_IN6_SIN6_SCOPE_ID)
addr->sin6_scope_id = if_index;
#endif
goto resolved;
}
}
else
{
if (inet_pton (AF_INET6, peername + 1, (void *) &(addr->sin6_addr)))
{
DEBUGMSGTL (("netsnmp_sockaddr_in6", "IPv6 address with square brackets\n"));
portno = netsnmp_ds_get_int (NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_DEFAULT_PORT);
if (portno <= 0)
portno = SNMP_PORT;
addr->sin6_port = htons ((u_short) portno);
#if defined(HAVE_STRUCT_SOCKADDR_IN6_SIN6_SCOPE_ID)
addr->sin6_scope_id = if_index;
#endif
goto resolved;
}
}
if (scope_id != NULL)
{
*scope_id = '%';
}
*cp = ']';
}
}
cp = strrchr (peername, ':');
if (cp != NULL)
{
char *scope_id;
unsigned int if_index = 0;
*cp = '\0';
scope_id = strchr (peername + 1, '%');
if (scope_id != NULL)
{
*scope_id = '\0';
if_index = netsnmp_if_nametoindex (scope_id + 1);
}
portno = atoi (cp + 1);
if (portno != 0 && inet_pton (AF_INET6, peername, (void *) &(addr->sin6_addr)))
{
DEBUGMSGTL (("netsnmp_sockaddr_in6", "IPv6 address with port suffix :%d\n", atoi (cp + 1)));
if (portno > 0 && portno < 0xffff)
{
addr->sin6_port = htons ((u_short) portno);
}
else
{
DEBUGMSGTL (("netsnmp_sockaddr_in6", "invalid port number: %d", portno));
return 0;
}
#if defined(HAVE_STRUCT_SOCKADDR_IN6_SIN6_SCOPE_ID)
addr->sin6_scope_id = if_index;
#endif
goto resolved;
}
if (scope_id != NULL)
{
*scope_id = '%';
}
*cp = ':';
}
/*
* See if it is JUST an IPv6 address.
*/
if (inet_pton (AF_INET6, peername, (void *) &(addr->sin6_addr)))
{
DEBUGMSGTL (("netsnmp_sockaddr_in6", "just IPv6 address\n"));
goto resolved;
}
/*
* Well, it must be a hostname then, possibly with an appended :port.
* Sort that out first.
*/
cp = strrchr (peername, ':');
if (cp != NULL)
{
*cp = '\0';
portno = atoi (cp + 1);
if (portno != 0)
{
DEBUGMSGTL (("netsnmp_sockaddr_in6", "hostname(?) with port suffix :%d\n", portno));
if (portno > 0 && portno < 0xffff)
{
addr->sin6_port = htons ((u_short) portno);
}
else
{
DEBUGMSGTL (("netsnmp_sockaddr_in6", "invalid port number: %d", portno));
return 0;
}
}
else
{
/*
* No idea, looks bogus but we might as well pass the full thing to
* the name resolver below.
*/
*cp = ':';
DEBUGMSGTL (("netsnmp_sockaddr_in6", "hostname(?) with embedded ':'?\n"));
}
/*
* Fall through.
*/
}
if (peername[0] == '\0')
{
DEBUGMSGTL (("netsnmp_sockaddr_in6", "empty hostname\n"));
free (peername);
return 0;
}
#if HAVE_GETADDRINFO
{
struct addrinfo hint = { 0 };
hint.ai_flags = 0;
hint.ai_family = PF_INET6;
hint.ai_socktype = SOCK_DGRAM;
hint.ai_protocol = 0;
err = netsnmp_getaddrinfo (peername, NULL, &hint, &addrs);
}
if (err != 0)
{
#if HAVE_GAI_STRERROR
snmp_log (LOG_ERR, "getaddrinfo(\"%s\", NULL, ...): %s\n", peername, gai_strerror (err));
#else
snmp_log (LOG_ERR, "getaddrinfo(\"%s\", NULL, ...): (error %d)\n", peername, err);
#endif
free (peername);
return 0;
}
if (addrs != NULL)
{
DEBUGMSGTL (("netsnmp_sockaddr_in6", "hostname (resolved okay)\n"));
memcpy (&addr->sin6_addr, &((struct sockaddr_in6 *) addrs->ai_addr)->sin6_addr, sizeof (struct in6_addr));
freeaddrinfo (addrs);
}
else
{
DEBUGMSGTL (("netsnmp_sockaddr_in6", "Failed to resolve IPv6 hostname\n"));
}
#elif HAVE_GETIPNODEBYNAME
hp = getipnodebyname (peername, AF_INET6, 0, &err);
if (hp == NULL)
{
DEBUGMSGTL (("netsnmp_sockaddr_in6", "hostname (couldn't resolve = %d)\n", err));
free (peername);
return 0;
}
DEBUGMSGTL (("netsnmp_sockaddr_in6", "hostname (resolved okay)\n"));
memcpy (&(addr->sin6_addr), hp->h_addr, hp->h_length);
#elif HAVE_GETHOSTBYNAME
hp = netsnmp_gethostbyname (peername);
if (hp == NULL)
{
DEBUGMSGTL (("netsnmp_sockaddr_in6", "hostname (couldn't resolve)\n"));
free (peername);
return 0;
}
else
{
if (hp->h_addrtype != AF_INET6)
{
DEBUGMSGTL (("netsnmp_sockaddr_in6", "hostname (not AF_INET6!)\n"));
free (peername);
return 0;
}
else
{
DEBUGMSGTL (("netsnmp_sockaddr_in6", "hostname (resolved okay)\n"));
memcpy (&(addr->sin6_addr), hp->h_addr, hp->h_length);
}
}
#else /*HAVE_GETHOSTBYNAME */
/*
* There is no name resolving function available.
*/
snmp_log (LOG_ERR, "no getaddrinfo()/getipnodebyname()/gethostbyname()\n");
free (peername);
return 0;
#endif /*HAVE_GETHOSTBYNAME */
}
else
{
DEBUGMSGTL (("netsnmp_sockaddr_in6", "NULL peername"));
return 0;
}
resolved:
DEBUGMSGTL (("netsnmp_sockaddr_in6", "return { AF_INET6, [%s]:%hu }\n",
inet_ntop (AF_INET6, &addr->sin6_addr, debug_addr, sizeof (debug_addr)), ntohs (addr->sin6_port)));
free (peername);
return 1;
}
int
netsnmp_gethostbyname_v4(const char* name, in_addr_t *addr_out)
{
#if HAVE_GETADDRINFO
struct addrinfo *addrs = NULL;
struct addrinfo hint;
int err;
memset(&hint, 0, sizeof hint);
hint.ai_flags = 0;
hint.ai_family = PF_INET;
hint.ai_socktype = SOCK_DGRAM;
hint.ai_protocol = 0;
err = netsnmp_getaddrinfo(name, NULL, &hint, &addrs);
if (err != 0) {
return -1;
}
if (addrs != NULL) {
memcpy(addr_out,
&((struct sockaddr_in *) addrs->ai_addr)->sin_addr,
sizeof(in_addr_t));
freeaddrinfo(addrs);
} else {
DEBUGMSGTL(("get_thisaddr",
"Failed to resolve IPv4 hostname\n"));
}
return 0;
#elif HAVE_GETHOSTBYNAME
struct hostent *hp = NULL;
hp = netsnmp_gethostbyname(name);
if (hp == NULL) {
DEBUGMSGTL(("get_thisaddr",
"hostname (couldn't resolve)\n"));
return -1;
} else if (hp->h_addrtype != AF_INET) {
DEBUGMSGTL(("get_thisaddr",
"hostname (not AF_INET!)\n"));
return -1;
} else {
DEBUGMSGTL(("get_thisaddr",
"hostname (resolved okay)\n"));
memcpy(addr_out, hp->h_addr, sizeof(in_addr_t));
}
return 0;
#elif HAVE_GETIPNODEBYNAME
struct hostent *hp = NULL;
int err;
hp = getipnodebyname(peername, AF_INET, 0, &err);
if (hp == NULL) {
DEBUGMSGTL(("get_thisaddr",
"hostname (couldn't resolve = %d)\n", err));
return -1;
}
DEBUGMSGTL(("get_thisaddr",
"hostname (resolved okay)\n"));
memcpy(addr_out, hp->h_addr, sizeof(in_addr_t));
return 0;
#else /* HAVE_GETIPNODEBYNAME */
return -1;
#endif
}
