dropbear: remove bind to interface patch

This patch was upstreamed and is now available in the currently used 20242.86 version of dropbear.
For this reason we can remove the patch from prplos.

Signed-off-by: Matthias Franck <matthias.franck@softathome.com>

package/network/services/dropbear/patches/920-bind-to-interface.patch

@@ -1,140 +0,0 @@
-From fb64db9eac3fdc6434f2dc7b5ea407fe5df76e6f Mon Sep 17 00:00:00 2001
-From: Diederik De Coninck <diederik.deconinck_ext@softathome.com>
-Date: Tue, 11 Apr 2023 15:38:04 +0200
-Subject: [PATCH] Add option to bind to interface
-
-Backport of upstream commit 35fa447c2bc ("Add option to bind to interface").
-
-Signed-off-by: Diederik De Coninck <diederik.deconinck_ext@softathome.com>
-
---- a/netio.c
-+++ b/netio.c
-@@ -464,7 +464,7 @@ int get_sock_port(int sock) {
-  * failure, if errstring wasn't NULL, it'll be a newly malloced error
-  * string.*/
- int dropbear_listen(const char* address, const char* port,
--		int *socks, unsigned int sockcount, char **errstring, int *maxfd) {
-+		int *socks, unsigned int sockcount, char **errstring, int *maxfd, const char* interface) {
- 
- 	struct addrinfo hints, *res = NULL, *res0 = NULL;
- 	int err;
-@@ -495,7 +495,11 @@ int dropbear_listen(const char* address,
- 		TRACE(("dropbear_listen: local loopback"))
- 	} else {
- 		if (address[0] == '\0') {
--			TRACE(("dropbear_listen: all interfaces"))
-+			if (interface) {
-+				TRACE(("dropbear_listen: %s", interface))
-+			} else {
-+				TRACE(("dropbear_listen: all interfaces"))
-+			}
- 			address = NULL;
- 		}
- 		hints.ai_flags = AI_PASSIVE;
-@@ -552,6 +556,11 @@ int dropbear_listen(const char* address,
- 		linger.l_linger = 5;
- 		setsockopt(sock, SOL_SOCKET, SO_LINGER, (void*)&linger, sizeof(linger));
- 
-+		if(interface && setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, interface, strlen(interface)) < 0) {
-+			dropbear_log(LOG_WARNING, "Couldn't set SO_BINDTODEVICE");
-+			TRACE(("Failed setsockopt with errno failure, %d %s", errno, strerror(errno)))
-+		}
-+
- #if defined(IPPROTO_IPV6) && defined(IPV6_V6ONLY)
- 		if (res->ai_family == AF_INET6) {
- 			int on = 1;
---- a/netio.h
-+++ b/netio.h
-@@ -19,7 +19,7 @@ void get_socket_address(int fd, char **l
- void getaddrstring(struct sockaddr_storage* addr, 
- 		char **ret_host, char **ret_port, int host_lookup);
- int dropbear_listen(const char* address, const char* port,
--		int *socks, unsigned int sockcount, char **errstring, int *maxfd);
-+		int *socks, unsigned int sockcount, char **errstring, int *maxfd, const char* interface);
- 
- struct dropbear_progress_connection;
- 
---- a/runopts.h
-+++ b/runopts.h
-@@ -126,6 +126,7 @@ typedef struct svr_runopts {
- 	char * pidfile;
- 
- 	char * forced_command;
-+	char* interface;
- 
- #if DROPBEAR_PLUGIN 
-         char *pubkey_plugin;
---- a/svr-main.c
-+++ b/svr-main.c
-@@ -484,7 +484,7 @@ static size_t listensockets(int *socks,
- 
- 		nsock = dropbear_listen(svr_opts.addresses[i], svr_opts.ports[i], &socks[sockpos], 
- 				sockcount - sockpos,
--				&errstring, maxfd);
-+				&errstring, maxfd, svr_opts.interface);
- 
- 		if (nsock < 0) {
- 			dropbear_log(LOG_WARNING, "Failed listening on '%s': %s", 
---- a/svr-runopts.c
-+++ b/svr-runopts.c
-@@ -97,6 +97,8 @@ static void printhelp(const char * progn
- 					"		(default port is %s if none specified)\n"
- 					"-P PidFile	Create pid file PidFile\n"
- 					"		(default %s)\n"
-+					"-l <interface>\n"
-+					"		interface to bind on\n"
- #if INETD_MODE
- 					"-i		Start for inetd\n"
- #endif
-@@ -261,6 +263,9 @@ void svr_getopts(int argc, char ** argv)
- 				case 'P':
- 					next = &svr_opts.pidfile;
- 					break;
-+				case 'l':
-+					next = &svr_opts.interface;
-+					break;
- #if DO_MOTD
- 				/* motd is displayed by default, -m turns it off */
- 				case 'm':
-@@ -428,6 +433,10 @@ void svr_getopts(int argc, char ** argv)
- 		dropbear_log(LOG_INFO, "Forced command set to '%s'", svr_opts.forced_command);
- 	}
- 
-+	if (svr_opts.interface) {
-+		dropbear_log(LOG_INFO, "Binding to interface '%s'", svr_opts.interface);
-+	}
-+
- 	if (reexec_fd_arg) {
- 		if (m_str_to_uint(reexec_fd_arg, &svr_opts.reexec_childpipe) == DROPBEAR_FAILURE
- 			|| svr_opts.reexec_childpipe < 0) {
---- a/svr-tcpfwd.c
-+++ b/svr-tcpfwd.c
-@@ -205,6 +205,7 @@ static int svr_remotetcpreq(int *allocat
- 	tcpinfo->listenport = port;
- 	tcpinfo->chantype = &svr_chan_tcpremote;
- 	tcpinfo->tcp_type = forwarded;
-+	tcpinfo->interface = svr_opts.interface;
- 
- 	tcpinfo->request_listenaddr = request_addr;
- 	if (!opts.listen_fwd_all || (strcmp(request_addr, "localhost") == 0) ) {
---- a/tcp-accept.c
-+++ b/tcp-accept.c
-@@ -117,7 +117,7 @@ int listen_tcpfwd(struct TCPListener* tc
- 	snprintf(portstring, sizeof(portstring), "%u", tcpinfo->listenport);
- 
- 	nsocks = dropbear_listen(tcpinfo->listenaddr, portstring, socks, 
--			DROPBEAR_MAX_SOCKS, &errstring, &ses.maxfd);
-+			DROPBEAR_MAX_SOCKS, &errstring, &ses.maxfd, tcpinfo->interface);
- 	if (nsocks < 0) {
- 		dropbear_log(LOG_INFO, "TCP forward failed: %s", errstring);
- 		m_free(errstring);
---- a/tcpfwd.h
-+++ b/tcpfwd.h
-@@ -42,6 +42,7 @@ struct TCPListener {
- 	unsigned int listenport;
- 	/* The address that the remote host asked to listen on */
- 	char *request_listenaddr;
-+	char* interface;
- 
- 	const struct ChanType *chantype;
- 	enum {direct, forwarded} tcp_type;