xio-interface.c

   1 /* source: xio-interface.c */
   2 /* Copyright Gerhard Rieger 2010 */
   3 /* Published under the GNU General Public License V.2, see file COPYING */
   4
   5 /* this file contains the source for opening addresses of raw socket type */
   6
   7 #include "xiosysincludes.h"
   8
   9 #if WITH_INTERFACE
  10
  11 #include "xioopen.h"
  12 #include "xio-socket.h"
  13
  14 #include "xio-interface.h"
  15
  16
  17 static
  18 int xioopen_interface(int argc, const char *argv[], struct opt *opts,
  19                       int xioflags, xiofile_t *xfd, unsigned groups, int pf,
  20                       int dummy2, int dummy3);
  21
  22 const struct addrdesc xioaddr_interface= { "interface",    3, xioopen_interface, GROUP_FD|GROUP_SOCKET, PF_PACKET, 0, 0 HELP(":<interface>") };
  23
  24
  25 static
  26 int _xioopen_interface(const char *ifname,
  27                        struct opt *opts, int xioflags, xiofile_t *xxfd,
  28                        unsigned groups, int pf) {
  29    xiosingle_t *xfd = &xxfd->stream;
  30    union sockaddr_union us = {{0}};
  31    socklen_t uslen;
  32    int socktype = SOCK_RAW;
  33    unsigned int ifidx;
  34    bool needbind = false;
  35    char *bindstring = NULL;
  36    struct sockaddr_ll sall = { 0 };
  37
  38    if (ifindex(ifname, &ifidx, -1) < 0) {
  39       Error1("unknown interface \"%s\"", ifname);
  40       ifidx = 0;        /* desparate attempt to continue */
  41    }
  42
  43    xfd->howtoend = END_SHUTDOWN;
  44    retropt_int(opts, OPT_SO_TYPE, &socktype);
  45
  46    retropt_socket_pf(opts, &pf);
  47
  48    /* ...res_opts[] */
  49    if (applyopts_single(xfd, opts, PH_INIT) < 0)  return -1;
  50    applyopts(-1, opts, PH_INIT);
  51
  52    xfd->salen = sizeof(xfd->peersa);
  53    if (pf == PF_UNSPEC) {
  54       pf = xfd->peersa.soa.sa_family;
  55    }
  56
  57    xfd->dtype = XIODATA_RECVFROM_SKIPIP;
  58
  59    if (retropt_string(opts, OPT_BIND, &bindstring)) {
  60       needbind = true;
  61    }
  62    /*!!! parse by ':' */
  63    us.ll.sll_family = pf;
  64    us.ll.sll_protocol = htons(ETH_P_ALL);
  65    us.ll.sll_ifindex = ifidx;
  66    uslen = sizeof(sall);
  67    needbind = true;
  68    xfd->peersa = (union sockaddr_union)us;
  69
  70    return
  71       _xioopen_dgram_sendto(needbind?&us:NULL, uslen,
  72                           opts, xioflags, xfd, groups, pf, socktype, 0);
  73 }
  74
  75 static
  76 int xioopen_interface(int argc, const char *argv[], struct opt *opts,
  77                       int xioflags, xiofile_t *xxfd, unsigned groups,
  78                       int pf, int dummy2, int dummy3) {
  79    xiosingle_t *xfd = &xxfd->stream;
  80    int result;
  81
  82    if (argc != 2) {
  83       Error2("%s: wrong number of parameters (%d instead of 1)",
  84              argv[0], argc-1);
  85       return STAT_NORETRY;
  86    }
  87
  88    if ((result =
  89         _xioopen_interface(argv[1], opts, xioflags, xxfd, groups, pf))
  90        != STAT_OK) {
  91       return result;
  92    }
  93
  94    xfd->dtype = XIOREAD_RECV|XIOWRITE_SENDTO;
  95    if (pf == PF_INET) {
  96       xfd->dtype |= XIOREAD_RECV_SKIPIP;
  97    }
  98
  99    xfd->para.socket.la.soa.sa_family = xfd->peersa.soa.sa_family;
 100
 101    _xio_openlate(xfd, opts);
 102    return STAT_OK;
 103 }
 104
 105 #endif /* WITH_INTERFACE */