This file is part of GNUnet.
Copyright (C) 2010 GNUnet e.V.
- GNUnet is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published
- by the Free Software Foundation; either version 3, or (at your
- option) any later version.
+ GNUnet is free software: you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published
+ by the Free Software Foundation, either version 3 of the License,
+ or (at your option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with GNUnet; see the file COPYING. If not, write to the
- Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- Boston, MA 02110-1301, USA.
+ Affero General Public License for more details.
*/
/**
#define ICMP_TIME_EXCEEDED 11
#endif
+/**
+ * Call memcpy() but check for @a n being 0 first. In the latter
+ * case, it is now safe to pass NULL for @a src or @a dst.
+ * Unlike traditional memcpy(), returns nothing.
+ *
+ * @param dst destination of the copy, may be NULL if @a n is zero
+ * @param src source of the copy, may be NULL if @a n is zero
+ * @param n number of bytes to copy
+ */
+#define GNUNET_memcpy(dst,src,n) do { if (0 != n) { (void) memcpy (dst,src,n); } } while (0)
+
/**
* Should we print some debug output?
*/
ip_pkt.checksum =
htons (calc_checksum ((uint16_t *) & ip_pkt,
sizeof (struct ip_header)));
- memcpy (&packet[off],
- &ip_pkt,
- sizeof (struct ip_header));
+ GNUNET_memcpy (&packet[off],
+ &ip_pkt,
+ sizeof (struct ip_header));
off += sizeof (struct ip_header);
icmp_echo.type = ICMP_ECHO;
htons (calc_checksum
((uint16_t *) & icmp_echo,
sizeof (struct icmp_echo_header)));
- memcpy (&packet[off],
- &icmp_echo,
- sizeof (struct icmp_echo_header));
+ GNUNET_memcpy (&packet[off],
+ &icmp_echo,
+ sizeof (struct icmp_echo_header));
off += sizeof (struct icmp_echo_header);
memset (&dst, 0, sizeof (dst));
return;
}
off = 0;
- memcpy (&ip_pkt, &buf[off], sizeof (struct ip_header));
+ GNUNET_memcpy (&ip_pkt,
+ &buf[off],
+ sizeof (struct ip_header));
off += sizeof (struct ip_header);
- memcpy (&icmp_ttl, &buf[off], sizeof (struct icmp_ttl_exceeded_header));
+ GNUNET_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))
{
source_ip.s_addr = ip_pkt.src_ip;
/* skip 2nd IP header */
- memcpy (&ip_pkt, &buf[off], sizeof (struct ip_header));
+ GNUNET_memcpy (&ip_pkt,
+ &buf[off],
+ sizeof (struct ip_header));
off += sizeof (struct ip_header);
switch (ip_pkt.proto)
return;
}
/* grab ICMP ECHO content */
- memcpy (&icmp_echo, &buf[off], sizeof (struct icmp_echo_header));
+ GNUNET_memcpy (&icmp_echo,
+ &buf[off],
+ sizeof (struct icmp_echo_header));
port = (uint16_t) ntohl (icmp_echo.reserved);
break;
case IPPROTO_UDP:
return;
}
/* grab UDP content */
- memcpy (&udp_pkt, &buf[off], sizeof (struct udp_header));
+ GNUNET_memcpy (&udp_pkt,
+ &buf[off],
+ sizeof (struct udp_header));
port = ntohs (udp_pkt.length);
break;
default: