new address "interface" for transparent network interface handling

2025-07-15 15:43:24 +00:00 · 2008-09-20 23:37:56 +02:00 · 2008-09-20 23:37:56 +02:00 · de910892f2
commit de910892f2
parent d70b8963aa
18 changed files with 300 additions and 31 deletions
--- a/xio-interface.c
+++ b/xio-interface.c
@ -0,0 +1,105 @@
+/* source: xio-interface.c */
+/* Copyright Gerhard Rieger 2008 */
+/* Published under the GNU General Public License V.2, see file COPYING */
+
+/* this file contains the source for opening addresses of raw socket type */
+
+#include "xiosysincludes.h"
+
+#if WITH_INTERFACE
+
+#include "xioopen.h"
+#include "xio-socket.h"
+
+#include "xio-interface.h"
+
+
+static
+int xioopen_interface(int argc, const char *argv[], struct opt *opts,
+		      int xioflags, xiofile_t *xfd, unsigned groups, int pf,
+		      int dummy2, int dummy3);
+
+const struct addrdesc xioaddr_interface= { "interface",    3, xioopen_interface, GROUP_FD|GROUP_SOCKET, PF_PACKET, 0, 0 HELP(":<interface>") };
+
+
+static
+int _xioopen_interface(const char *ifname,
+		       struct opt *opts, int xioflags, xiofile_t *xxfd,
+		       unsigned groups, int pf) {
+   xiosingle_t *xfd = &xxfd->stream;
+   union sockaddr_union us = {{0}};
+   socklen_t uslen;
+   int socktype = SOCK_RAW;
+   unsigned int ifidx;
+   bool needbind = false;
+   char *bindstring = NULL;
+   struct sockaddr_ll sall = { 0 };
+
+   if (ifindex(ifname, &ifidx, -1) < 0) {
+      Error1("unknown interface \"%s\"", ifname);
+      ifidx = 0;	/* desparate attempt to continue */
+   }
+
+   xfd->howtoend = END_SHUTDOWN;
+   retropt_int(opts, OPT_SO_TYPE, &socktype);
+
+   retropt_socket_pf(opts, &pf);
+
+   /* ...res_opts[] */
+   if (applyopts_single(xfd, opts, PH_INIT) < 0)  return -1;
+   applyopts(-1, opts, PH_INIT);
+
+   xfd->salen = sizeof(xfd->peersa);
+   if (pf == PF_UNSPEC) {
+      pf = xfd->peersa.soa.sa_family;
+   }
+
+   xfd->dtype = XIODATA_RECVFROM_SKIPIP;
+
+   if (retropt_string(opts, OPT_BIND, &bindstring)) {
+      needbind = true;
+   }
+   /*!!! parse by ':' */
+   ((struct sockaddr_ll *)&us)->sll_family = pf;
+   ((struct sockaddr_ll *)&us)->sll_protocol = htons(ETH_P_ALL);
+   ((struct sockaddr_ll *)&us)->sll_ifindex = ifidx;
+   uslen = sizeof(sall);
+   needbind = true;
+   xfd->peersa = (union sockaddr_union)us;
+
+   return
+      _xioopen_dgram_sendto(needbind?&us:NULL, uslen,
+			  opts, xioflags, xfd, groups, pf, socktype, 0);
+}
+
+static
+int xioopen_interface(int argc, const char *argv[], struct opt *opts,
+		      int xioflags, xiofile_t *xxfd, unsigned groups,
+		      int pf, int dummy2, int dummy3) {
+   xiosingle_t *xfd = &xxfd->stream;
+   int result;
+
+   if (argc != 2) {
+      Error2("%s: wrong number of parameters (%d instead of 1)",
+	     argv[0], argc-1);
+      return STAT_NORETRY;
+   }
+
+   if ((result =
+	_xioopen_interface(argv[1], opts, xioflags, xxfd, groups, pf))
+       != STAT_OK) {
+      return result;
+   }
+
+   xfd->dtype = XIOREAD_RECV|XIOWRITE_SENDTO;
+   if (pf == PF_INET) {
+      xfd->dtype |= XIOREAD_RECV_SKIPIP;
+   }
+
+   xfd->para.socket.la.soa.sa_family = xfd->peersa.soa.sa_family;
+
+   _xio_openlate(xfd, opts);
+   return STAT_OK;
+}
+
+#endif /* WITH_INTERFACE */