contrib/ipfilter/ipsend/sirix.c

   1 /*      $FreeBSD$       */
   2
   3 /*
   4  * (C)opyright 1992-1998 Darren Reed.
   5  * (C)opyright 1997 Marc Boucher.
   6  *
   7  * See the IPFILTER.LICENCE file for details on licencing.
   8  *
   9  */
  10 #include <stdio.h>
  11 #include <sys/types.h>
  12 #include <string.h>
  13 #include <unistd.h>
  14 #include <stdlib.h>
  15 #include <errno.h>
  16 #include <sys/socket.h>
  17 #include <sys/ioctl.h>
  18
  19 #include <net/if.h>
  20 #include <net/raw.h>
  21 #include <netinet/in.h>
  22 #include <netinet/in_systm.h>
  23 #include <netinet/ip.h>
  24 #include <netinet/if_ether.h>
  25 #include <netinet/ip_var.h>
  26 #include "ipsend.h"
  27 #include <netinet/udp_var.h>
  28
  29 #if !defined(lint) && defined(LIBC_SCCS)
  30 static  char    sirix[] = "@(#)sirix.c  1.0 10/9/97 (C)1997 Marc Boucher";
  31 #endif
  32
  33
  34 int     initdevice(char *device, int tout)
  35 {
  36         int fd;
  37         struct sockaddr_raw sr;
  38
  39         if ((fd = socket(PF_RAW, SOCK_RAW, RAWPROTO_DRAIN)) < 0)
  40             {
  41                 perror("socket(PF_RAW, SOCK_RAW, RAWPROTO_DRAIN)");
  42                 return -1;
  43             }
  44
  45         memset(&sr, 0, sizeof(sr));
  46         sr.sr_family = AF_RAW;
  47         sr.sr_port = ETHERTYPE_IP;
  48         strncpy(sr.sr_ifname, device, sizeof(sr.sr_ifname));
  49         if (bind(fd, &sr, sizeof(sr)) < 0)
  50             {
  51                 perror("bind AF_RAW");
  52                 close(fd);
  53                 return -1;
  54             }
  55         return fd;
  56 }
  57
  58
  59 /*
  60  * output an IP packet
  61  */
  62 int     sendip(int fd, char *pkt, int len)
  63 {
  64         struct sockaddr_raw sr;
  65         int srlen = sizeof(sr);
  66         struct ifreq ifr;
  67         struct ether_header *eh = (struct ether_header *)pkt;
  68
  69         if (getsockname(fd, &sr, &srlen) == -1)
  70             {
  71                 perror("getsockname");
  72                 return -1;
  73             }
  74
  75         memset(&ifr, 0, sizeof(ifr));
  76         strncpy(ifr.ifr_name, sr.sr_ifname, sizeof ifr.ifr_name);
  77
  78         if (ioctl(fd, SIOCGIFADDR, &ifr) == -1)
  79             {
  80                 perror("ioctl SIOCGIFADDR");
  81                 return -1;
  82             }
  83
  84         memcpy(eh->ether_shost, ifr.ifr_addr.sa_data, sizeof(eh->ether_shost));
  85
  86         if (write(fd, pkt, len) == -1)
  87             {
  88                 perror("send");
  89                 return -1;
  90             }
  91
  92         return len;
  93 }