From 2d2890dd3774c9b1f90828f41d06e4998191d2f7 Mon Sep 17 00:00:00 2001
From: guy <guy>
Date: Tue, 23 Mar 2004 19:18:04 +0000
Subject: Add support for sending packets; includes contributions from Mark
 Pizzolato <List-tcpdump-workers@subscriptions.pizzolato.net>.

---
 pcap-nit.c | 32 +++++++++++++++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

(limited to 'pcap-nit.c')

diff --git a/pcap-nit.c b/pcap-nit.c
index ae4c40c..7517f9e 100644
--- a/pcap-nit.c
+++ b/pcap-nit.c
@@ -20,7 +20,7 @@
  */
 #ifndef lint
 static const char rcsid[] _U_ =
-    "@(#) $Header: /tcpdump/master/libpcap/pcap-nit.c,v 1.55 2004-03-21 08:32:05 guy Exp $ (LBL)";
+    "@(#) $Header: /tcpdump/master/libpcap/pcap-nit.c,v 1.56 2004-03-23 19:18:06 guy Exp $ (LBL)";
 #endif
 
 #ifdef HAVE_CONFIG_H
@@ -192,6 +192,23 @@ pcap_read_nit(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
 	return (n);
 }
 
+static int
+pcap_inject_nit(pcap_t *p, const void *buf, size_t size)
+{
+	struct sockaddr sa;
+	int ret;
+
+	memset(&sa, 0, sizeof(sa));
+	strncpy(sa.sa_data, device, sizeof(sa.sa_data));
+	ret = sendto(p->fd, buf, size, 0, &sa, sizeof(sa));
+	if (ret == -1) {
+		snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send: %s",
+		    pcap_strerror(errno));
+		return (-1);
+	}
+	return (ret);
+}                           
+
 static int
 nit_setflags(int fd, int promisc, int to_ms, char *ebuf)
 {
@@ -226,6 +243,8 @@ pcap_close_nit(pcap_t *p)
 {
 	if (p->buffer != NULL)
 		free(p->buffer);
+	if (p->device != NULL)
+		free(p->device);
 	if (p->fd >= 0)
 		close(p->fd);
 }
@@ -280,6 +299,16 @@ pcap_open_live(const char *device, int snaplen, int promisc, int to_ms,
 		goto bad;
 	}
 
+	/*
+	 * We need the device name in order to send packets.
+	 */
+	p->device = strdup(device);
+	if (p->device == NULL) {
+		strlcpy(ebuf, pcap_strerror(errno), PCAP_ERRBUF_SIZE);
+		free(p->buffer);
+		goto bad;
+	}
+
 	/*
 	 * "p->fd" is a socket, so "select()" should work on it.
 	 */
@@ -306,6 +335,7 @@ pcap_open_live(const char *device, int snaplen, int promisc, int to_ms,
 	}
 
 	p->read_op = pcap_read_nit;
+	p->inject_op = pcap_inject_nit;
 	p->setfilter_op = install_bpf_program;	/* no kernel filtering */
 	p->set_datalink_op = NULL;	/* can't change data link type */
 	p->getnonblock_op = pcap_getnonblock_fd;
-- 
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