contrib/ipfilter/ipsend/slinux.c

   1 /*
   2  * (C)opyright 1992-1998 Darren Reed. (from tcplog)
   3  *
   4  * See the IPFILTER.LICENCE file for details on licencing.
   5  */
   6
   7 #include <stdio.h>
   8 #include <string.h>
   9 #include <netdb.h>
  10 #include <ctype.h>
  11 #include <signal.h>
  12 #include <errno.h>
  13 #include <sys/types.h>
  14 #include <sys/time.h>
  15 #include <sys/timeb.h>
  16 #include <sys/socket.h>
  17 #include <sys/file.h>
  18 #include <sys/ioctl.h>
  19 #include <sys/dir.h>
  20 #include <linux/netdevice.h>
  21 #include <net/if.h>
  22 #include <netinet/in.h>
  23 #include <netinet/in_systm.h>
  24 #include <netinet/ip.h>
  25 #include <netinet/tcp.h>
  26 #include "ipsend.h"
  27
  28 #if !defined(lint)
  29 static const char sccsid[] = "@(#)slinux.c      1.2 8/25/95";
  30 static const char rcsid[] = "@(#)$Id: slinux.c,v 2.1.4.1 2001/06/26 10:43:22 darrenr Exp $";
  31 #endif
  32
  33 #define CHUNKSIZE       8192
  34 #define BUFSPACE        (4*CHUNKSIZE)
  35
  36 /*
  37  * Be careful to only include those defined in the flags option for the
  38  * interface are included in the header size.
  39  */
  40
  41 static  int     timeout;
  42 static  char    *eth_dev = NULL;
  43
  44
  45 int     initdevice(dev, sport, spare)
  46 char    *dev;
  47 int     sport, spare;
  48 {
  49         int fd;
  50
  51         eth_dev = strdup(dev);
  52         if ((fd = socket(AF_INET, SOCK_PACKET, htons(ETHERTYPE_IP))) == -1)
  53             {
  54                 perror("socket(SOCK_PACKET)");
  55                 exit(-1);
  56             }
  57
  58         return fd;
  59 }
  60
  61
  62 /*
  63  * output an IP packet onto a fd opened for /dev/nit
  64  */
  65 int     sendip(fd, pkt, len)
  66 int     fd, len;
  67 char    *pkt;
  68 {
  69         struct  sockaddr        s;
  70         struct  ifreq   ifr;
  71
  72         strncpy(ifr.ifr_name, eth_dev, sizeof(ifr.ifr_name));
  73         if (ioctl(fd, SIOCGIFHWADDR, &ifr) == -1)
  74             {
  75                 perror("SIOCGIFHWADDR");
  76                 return -1;
  77             }
  78         bcopy(ifr.ifr_hwaddr.sa_data, pkt + 6, 6);
  79         s.sa_family = ETHERTYPE_IP;
  80         strncpy(s.sa_data, eth_dev, sizeof(s.sa_data));
  81
  82         if (sendto(fd, pkt, len, 0, &s, sizeof(s)) == -1)
  83             {
  84                 perror("send");
  85                 return -1;
  86             }
  87
  88         return len;
  89 }