contrib/ipfilter/ipsend/sbpf.c

   1 /* $FreeBSD$ */
   2 /*
   3  * (C)opyright 1995-1998 Darren Reed. (from tcplog)
   4  *
   5  * See the IPFILTER.LICENCE file for details on licencing.
   6  *
   7  */
   8 #include <sys/param.h>
   9 #include <sys/types.h>
  10 #include <sys/mbuf.h>
  11 #include <sys/time.h>
  12 #include <sys/timeb.h>
  13 #include <sys/socket.h>
  14 #include <sys/file.h>
  15 #include <sys/ioctl.h>
  16 #if BSD < 199103
  17 #include <sys/fcntlcom.h>
  18 #endif
  19 #if (__FreeBSD_version >= 300000)
  20 # include <sys/dirent.h>
  21 #else
  22 # include <sys/dir.h>
  23 #endif
  24 #include <net/bpf.h>
  25
  26 #include <net/if.h>
  27 #include <netinet/in.h>
  28 #include <netinet/in_systm.h>
  29 #include <netinet/ip.h>
  30 #include <netinet/ip_var.h>
  31 #include <netinet/udp.h>
  32 #include <netinet/udp_var.h>
  33 #include <netinet/tcp.h>
  34
  35 #include <stdio.h>
  36 #include <netdb.h>
  37 #include <string.h>
  38 #include <unistd.h>
  39 #include <stdlib.h>
  40 #ifdef __NetBSD__
  41 # include <paths.h>
  42 #endif
  43 #include <ctype.h>
  44 #include <signal.h>
  45 #include <errno.h>
  46
  47 #include "ipsend.h"
  48
  49 #if !defined(lint)
  50 static const char sccsid[] = "@(#)sbpf.c        1.3 8/25/95 (C)1995 Darren Reed";
  51 static const char rcsid[] = "@(#)$Id: sbpf.c,v 2.5.4.1 2006/03/21 16:32:58 darrenr Exp $";
  52 #endif
  53
  54 /*
  55  * the code herein is dervied from libpcap.
  56  */
  57 static  u_char  *buf = NULL;
  58 static  int     bufsize = 0, timeout = 1;
  59
  60
  61 int     initdevice(device, tout)
  62 char    *device;
  63 int     tout;
  64 {
  65         struct  bpf_version bv;
  66         struct  timeval to;
  67         struct  ifreq ifr;
  68 #ifdef _PATH_BPF
  69         char    *bpfname = _PATH_BPF;
  70         int     fd;
  71
  72         if ((fd = open(bpfname, O_RDWR)) < 0)
  73             {
  74                 fprintf(stderr, "no bpf devices available as /dev/bpfxx\n");
  75                 return -1;
  76             }
  77 #else
  78         char    bpfname[16];
  79         int     fd = 0, i;
  80
  81         for (i = 0; i < 16; i++)
  82             {
  83                 (void) sprintf(bpfname, "/dev/bpf%d", i);
  84                 if ((fd = open(bpfname, O_RDWR)) >= 0)
  85                         break;
  86             }
  87         if (i == 16)
  88             {
  89                 fprintf(stderr, "no bpf devices available as /dev/bpfxx\n");
  90                 return -1;
  91             }
  92 #endif
  93
  94         if (ioctl(fd, BIOCVERSION, (caddr_t)&bv) < 0)
  95             {
  96                 perror("BIOCVERSION");
  97                 return -1;
  98             }
  99         if (bv.bv_major != BPF_MAJOR_VERSION ||
 100             bv.bv_minor < BPF_MINOR_VERSION)
 101             {
 102                 fprintf(stderr, "kernel bpf (v%d.%d) filter out of date:\n",
 103                         bv.bv_major, bv.bv_minor);
 104                 fprintf(stderr, "current version: %d.%d\n",
 105                         BPF_MAJOR_VERSION, BPF_MINOR_VERSION);
 106                 return -1;
 107             }
 108
 109         (void) strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
 110         if (ioctl(fd, BIOCSETIF, &ifr) == -1)
 111             {
 112                 fprintf(stderr, "%s(%d):", ifr.ifr_name, fd);
 113                 perror("BIOCSETIF");
 114                 exit(1);
 115             }
 116         /*
 117          * get kernel buffer size
 118          */
 119         if (ioctl(fd, BIOCGBLEN, &bufsize) == -1)
 120             {
 121                 perror("BIOCSBLEN");
 122                 exit(-1);
 123             }
 124         buf = (u_char*)malloc(bufsize);
 125         /*
 126          * set the timeout
 127          */
 128         timeout = tout;
 129         to.tv_sec = 1;
 130         to.tv_usec = 0;
 131         if (ioctl(fd, BIOCSRTIMEOUT, (caddr_t)&to) == -1)
 132             {
 133                 perror("BIOCSRTIMEOUT");
 134                 exit(-1);
 135             }
 136
 137         (void) ioctl(fd, BIOCFLUSH, 0);
 138         return fd;
 139 }
 140
 141
 142 /*
 143  * output an IP packet onto a fd opened for /dev/bpf
 144  */
 145 int     sendip(fd, pkt, len)
 146 int     fd, len;
 147 char    *pkt;
 148 {
 149         if (write(fd, pkt, len) == -1)
 150             {
 151                 perror("send");
 152                 return -1;
 153             }
 154
 155         return len;
 156 }