1 files changed, 124 insertions, 0 deletions
diff --git a/usr.sbin/ipsend/ipresend/resend.c b/usr.sbin/ipsend/ipresend/resend.c
new file mode 100644
index 00000000000..8d9d75574d2
--- /dev/null
+++ b/usr.sbin/ipsend/ipresend/resend.c
@@ -0,0 +1,124 @@
+/*
+ * resend.c (C) 1995 Darren Reed
+ *
+ * This was written to test what size TCP fragments would get through
+ * various TCP/IP packet filters, as used in IP firewalls.  In certain
+ * conditions, enough of the TCP header is missing for unpredictable
+ * results unless the filter is aware that this can happen.
+ *
+ */
+#ifndef	lint
+static	char	sccsid[] = "@(#)resend.c	1.3 1/11/96 (C)1995 Darren Reed";
+#endif
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/socket.h>
+#include <net/if.h>
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/tcp.h>
+#include <netinet/udp.h>
+#include <netinet/ip_icmp.h>
+#ifndef	linux
+#include <netinet/ip_var.h>
+#include <netinet/tcpip.h>
+#include <netinet/if_ether.h>
+#endif
+#include "ip_compat.h"
+#ifdef	linux
+#include <linux/sockios.h>
+#include "tcpip.h"
+#endif
+#include "ipt.h"
+
+
+static	u_char	buf[65536];	/* 1 big packet */
+
+
+printpacket(ip)
+ip_t	*ip;
+{
+	tcphdr_t *t;
+	int i, j;
+
+	t = (tcphdr_t *)((char *)ip + (ip->ip_hl << 2));
+	if (ip->ip_tos)
+		printf("tos %#x ", ip->ip_tos);
+	if (ip->ip_off & 0x3fff)
+		printf("frag @%#x ", (ip->ip_off & 0x1fff) << 3);
+	printf("len %d id %d ", ip->ip_len, ip->ip_id);
+	printf("ttl %d p %d src %s", ip->ip_ttl, ip->ip_p,
+		inet_ntoa(ip->ip_src));
+	if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP)
+		printf(",%d", t->th_sport);
+	printf(" dst %s", inet_ntoa(ip->ip_dst));
+	if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP)
+		printf(",%d", t->th_sport);
+	if (ip->ip_p == IPPROTO_TCP) {
+		printf(" seq %u:%u flags ", t->th_seq, t->th_ack);
+		for (j = 0, i = 1; i < 256; i *= 2, j++)
+			if (t->th_flags & i)
+				printf("%c", "FSRPAU--"[j]);
+	}
+	putchar('\n');
+}
+
+
+int	ip_resend(dev, mtu, r, gwip, datain)
+char	*dev;
+struct	in_addr	gwip;
+struct	ipread	*r;
+char	*datain;
+{
+	ether_header_t	*eh;
+	char	dhost[6];
+	ip_t	*ip;
+	int	fd, wfd = initdevice(dev, 0, 5), len, i;
+
+	if (datain)
+		fd = (*r->r_open)(datain);
+	else
+		fd = (*r->r_open)("-");
+ 
+	if (fd < 0)
+		exit(-1);
+
+	ip = (struct ip *)buf;
+	eh = (ether_header_t *)malloc(sizeof(*eh));
+
+	bzero(&eh->ether_shost, sizeof(eh->ether_shost));
+	if (gwip.s_addr && (arp((char *)&gwip, dhost) == -1))
+	    {
+		perror("arp");
+		return -2;
+	    }
+
+	while ((i = (*r->r_readip)(buf, sizeof(buf), NULL, NULL)) > 0)
+	    {
+		len = ntohs(ip->ip_len);
+		eh = (ether_header_t *)realloc((char *)eh, sizeof(*eh) + len);
+		eh->ether_type = htons((u_short)ETHERTYPE_IP);
+		if (!gwip.s_addr) {
+			if (arp((char *)&gwip,
+				(char *)&eh->ether_dhost) == -1) {
+				perror("arp");
+				continue;
+			}
+		} else
+			bcopy(dhost, (char *)&eh->ether_dhost, sizeof(dhost));
+		bcopy(ip, (char *)(eh + 1), len);
+		printpacket(ip);
+
+		if (sendip(wfd, eh, sizeof(*eh) + len) == -1)
+		    {
+			perror("send_packet");
+			break;
+		    }
+	    }
+	(*r->r_close)();
+	return 0;
+}