Patch by Dennis Filder <d.filder@web.de> for dsniff >= 2.4b1 to resolve naming
collision due to libpcap API changes. Dsniff was written with a function named
pcap_init() that predates the one in libpcap and is entirely different. This patch
renames it out of the way. For some more information, please have a look to Debian
bug ID #980588.

--- dsniff-2.4/dnsspoof.c			2021-07-25 01:00:08.445636429 +0200
+++ dsniff-2.4/dnsspoof.c.pcap_init		2021-07-25 01:00:53.540928897 +0200
@@ -309,7 +309,7 @@
 	else snprintf(buf, sizeof(buf), "udp dst port 53 and not src %s",
 		      libnet_addr2name4(lnet_ip, LIBNET_DONT_RESOLVE));
 	
-	if ((pcap_pd = pcap_init(dev, buf, 128)) == NULL)
+	if ((pcap_pd = pcap_init_dsniff(dev, buf, 128)) == NULL)
 		errx(1, "couldn't initialize sniffing");
 
 	if ((pcap_off = pcap_dloff(pcap_pd)) < 0)
--- dsniff-2.4/pcaputil.c			2021-07-25 01:00:08.469636585 +0200
+++ dsniff-2.4/pcaputil.c.pcap_init		2021-07-25 01:00:59.816969598 +0200
@@ -111,7 +111,7 @@
 }
 
 pcap_t *
-pcap_init(char *intf, char *filter, int snaplen)
+pcap_init_dsniff(char *intf, char *filter, int snaplen)
 {
 	pcap_t *pd;
 	u_int net, mask;
--- dsniff-2.4/pcaputil.h			2001-03-15 09:33:06.000000000 +0100
+++ dsniff-2.4/pcaputil.h.pcap_init		2021-07-25 01:07:46.246603851 +0200
@@ -11,7 +11,7 @@
 #ifndef PCAPUTIL_H
 #define PCAPUTIL_H
 
-pcap_t *pcap_init(char *intf, char *filter, int snaplen);
+pcap_t *pcap_init_dsniff(char *intf, char *filter, int snaplen);
 
 int	pcap_dloff(pcap_t *pd);
 
--- dsniff-2.4/tcpkill.c			2021-07-25 01:00:08.426636306 +0200
+++ dsniff-2.4/tcpkill.c.pcap_init		2021-07-25 01:01:06.728014416 +0200
@@ -130,7 +130,7 @@
 	
 	filter = copy_argv(argv);
 	
-	if ((pd = pcap_init(intf, filter, 64)) == NULL)
+	if ((pd = pcap_init_dsniff(intf, filter, 64)) == NULL)
 		errx(1, "couldn't initialize sniffing");
 
 	if ((pcap_off = pcap_dloff(pd)) < 0)
--- dsniff-2.4/tcpnice.c			2021-07-25 01:00:08.426636306 +0200
+++ dsniff-2.4/tcpnice.c.pcap_init		2021-07-25 01:01:13.816060381 +0200
@@ -204,7 +204,7 @@
 	
 	filter = copy_argv(argv);
 	
-	if ((pd = pcap_init(intf, filter, 128)) == NULL)
+	if ((pd = pcap_init_dsniff(intf, filter, 128)) == NULL)
 		errx(1, "couldn't initialize sniffing");
 
 	if ((pcap_off = pcap_dloff(pd)) < 0)