* - Christian Grothoff
* - Nathan Evans
* - Benjamin Kuperman (22 Aug 2010)
+ * - Jacob Appelbaum (19 Dec 2011)
*/
#if HAVE_CONFIG_H
/* Just needed for HAVE_SOCKADDR_IN_SIN_LEN test macro! */
off = 0;
memcpy (&ip_pkt, &buf[off], sizeof (struct ip_header));
off += sizeof (struct ip_header);
- memcpy (&source_ip, &ip_pkt.src_ip, sizeof (source_ip));
memcpy (&icmp_ttl, &buf[off], sizeof (struct icmp_ttl_exceeded_header));
off += sizeof (struct icmp_ttl_exceeded_header);
if ((ICMP_TIME_EXCEEDED != icmp_ttl.type) || (0 != icmp_ttl.code))
return;
}
+ source_ip.s_addr = ip_pkt.src_ip;
if (port == 0)
fprintf (stdout, "%s\n",
inet_ntop (AF_INET, &source_ip, buf, sizeof (buf)));
/**
- * Create an ICMP raw socket for reading.
+ * Fully initialize the raw socket.
*
- * @return -1 on error
+ * @return -1 on error, 0 on success
*/
static int
-make_icmp_socket ()
-{
- int ret;
-
- ret = socket (AF_INET, SOCK_RAW, IPPROTO_ICMP);
- if (-1 == ret)
- {
- fprintf (stderr, "Error opening RAW socket: %s\n", strerror (errno));
- return -1;
- }
- if (ret >= FD_SETSIZE)
- {
- fprintf (stderr, "Socket number too large (%d > %u)\n", ret,
- (unsigned int) FD_SETSIZE);
- close (ret);
- return -1;
- }
- return ret;
-}
-
-
-/**
- * Create an ICMP raw socket for writing.
- *
- * @return -1 on error
- */
-static int
-make_raw_socket ()
+setup_raw_socket ()
{
const int one = 1;
- int ret;
- ret = socket (AF_INET, SOCK_RAW, IPPROTO_RAW);
- if (-1 == ret)
- {
- fprintf (stderr, "Error opening RAW socket: %s\n", strerror (errno));
- return -1;
- }
if (-1 ==
- setsockopt (ret, SOL_SOCKET, SO_BROADCAST, (char *) &one, sizeof (one)))
+ setsockopt (rawsock, SOL_SOCKET, SO_BROADCAST, (char *) &one, sizeof (one)))
{
fprintf (stderr, "setsockopt failed: %s\n", strerror (errno));
- close (ret);
return -1;
}
if (-1 ==
- setsockopt (ret, IPPROTO_IP, IP_HDRINCL, (char *) &one, sizeof (one)))
+ setsockopt (rawsock, IPPROTO_IP, IP_HDRINCL, (char *) &one, sizeof (one)))
{
fprintf (stderr, "setsockopt failed: %s\n", strerror (errno));
- close (ret);
return -1;
}
- return ret;
+ return 0;
}
{
fprintf (stderr, "Error binding UDP socket to port %u: %s\n", NAT_TRAV_PORT,
strerror (errno));
- close (ret);
+ (void) close (ret);
return -1;
}
return ret;
struct timeval tv;
uid_t uid;
unsigned int alt;
+ int icmp_eno;
+ int raw_eno;
+ int global_ret;
+
+ /* Create an ICMP raw socket for reading (we'll check errors later) */
+ icmpsock = socket (AF_INET, SOCK_RAW, IPPROTO_ICMP);
+ icmp_eno = errno;
+
+ /* Create an (ICMP) raw socket for writing (we'll check errors later) */
+ rawsock = socket (AF_INET, SOCK_RAW, IPPROTO_RAW);
+ raw_eno = errno;
+ udpsock = -1;
+ /* drop root rights */
+ uid = getuid ();
+#ifdef HAVE_SETRESUID
+ if (0 != setresuid (uid, uid, uid))
+ {
+ fprintf (stderr, "Failed to setresuid: %s\n", strerror (errno));
+ global_ret = 1;
+ goto error_exit;
+ }
+#else
+ if (0 != (setuid (uid) | seteuid (uid)))
+ {
+ fprintf (stderr, "Failed to setuid: %s\n", strerror (errno));
+ global_ret = 2;
+ goto error_exit;
+ }
+#endif
+
+ /* Now that we run without root rights, we can do error checking... */
if (2 != argc)
{
fprintf (stderr,
"This program must be started with our (internal NAT) IP as the only argument.\n");
- return 1;
+ global_ret = 3;
+ goto error_exit;
}
if (1 != inet_pton (AF_INET, argv[1], &external))
{
fprintf (stderr, "Error parsing IPv4 address: %s\n", strerror (errno));
- return 1;
+ global_ret = 4;
+ goto error_exit;
}
if (1 != inet_pton (AF_INET, DUMMY_IP, &dummy))
{
fprintf (stderr, "Internal error converting dummy IP to binary.\n");
- return 2;
+ global_ret = 5;
+ goto error_exit;
}
- if (-1 == (icmpsock = make_icmp_socket ()))
+
+ /* error checking icmpsock */
+ if (-1 == icmpsock)
{
- return 3;
+ fprintf (stderr, "Error opening RAW socket: %s\n", strerror (icmp_eno));
+ global_ret = 6;
+ goto error_exit;
}
- if (-1 == (rawsock = make_raw_socket ()))
+ if (icmpsock >= FD_SETSIZE)
{
- close (icmpsock);
- return 4;
+ /* this could happen if we were started with a large number of already-open
+ file descriptors... */
+ fprintf (stderr, "Socket number too large (%d > %u)\n", icmpsock,
+ (unsigned int) FD_SETSIZE);
+ global_ret = 7;
+ goto error_exit;
}
- uid = getuid ();
-#ifdef HAVE_SETRESUID
- if (0 != setresuid (uid, uid, uid))
+
+ /* error checking rawsock */
+ if (-1 == rawsock)
{
- fprintf (stderr, "Failed to setresuid: %s\n", strerror (errno));
- return 5;
+ fprintf (stderr, "Error opening RAW socket: %s\n", strerror (raw_eno));
+ global_ret = 8;
+ goto error_exit;
}
-#else
- if (0 != (setuid (uid) | seteuid (uid)))
+ /* no need to check 'rawsock' against FD_SETSIZE as it is never used
+ with 'select' */
+
+ if (0 != setup_raw_socket ())
{
- fprintf (stderr, "Failed to setuid: %s\n", strerror (errno));
- return 6;
+ global_ret = 9;
+ goto error_exit;
}
-#endif
+
if (-1 == (udpsock = make_udp_socket (&external)))
{
- close (icmpsock);
- close (rawsock);
- return 7;
+ global_ret = 10;
+ goto error_exit;
}
+
alt = 0;
while (1)
{
else
send_udp ();
}
+
/* select failed (internal error or OS out of resources) */
- close (icmpsock);
- close (rawsock);
- close (udpsock);
- return 8;
+ global_ret = 11;
+error_exit:
+ if (-1 != icmpsock)
+ (void) close (icmpsock);
+ if (-1 != rawsock)
+ (void) close (rawsock);
+ if (-1 != udpsock)
+ (void) close (udpsock);
+ return global_ret;
}
projects / oweals / gnunet.git / blobdiff