141 lines
2.7 KiB
C
141 lines
2.7 KiB
C
/*
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* (C)opyright October 1995 Darren Reed. (from tcplog)
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*
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* This software may be freely distributed as long as it is not altered
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* in any way and that this messagge always accompanies it.
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*
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*/
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#include <stdio.h>
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#include <netdb.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <signal.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/mbuf.h>
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#include <sys/time.h>
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#include <sys/timeb.h>
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#include <sys/socket.h>
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#include <sys/file.h>
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#include <sys/ioctl.h>
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#if BSD < 199103
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#include <sys/fcntlcom.h>
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#endif
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#include <sys/dir.h>
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#include <net/bpf.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#if defined(__NetBSD__)
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#include <netinet/if_inarp.h>
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#else
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#include <netinet/if_ether.h>
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#endif
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#include <netinet/ip_var.h>
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#include <netinet/udp.h>
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#include <netinet/udp_var.h>
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#include <netinet/tcp.h>
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#include <netinet/tcpip.h>
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#if !defined(lint) && defined(LIBC_SCCS)
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static char sbpf[] = "@(#)sbpf.c 1.3 8/25/95 (C)1995 Darren Reed";
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#endif
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/*
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* the code herein is dervied from libpcap.
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*/
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static u_char *buf = NULL;
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static int bufsize = 0, timeout = 1;
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int initdevice(device, sport, tout)
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char *device;
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int sport, tout;
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{
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struct bpf_version bv;
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struct timeval to;
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struct ifreq ifr;
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char bpfname[16];
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int fd, i;
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for (i = 0; i < 16; i++)
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{
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(void) sprintf(bpfname, "/dev/bpf%d", i);
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if ((fd = open(bpfname, O_RDWR)) >= 0)
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break;
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}
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if (i == 16)
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{
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fprintf(stderr, "no bpf devices available as /dev/bpfxx\n");
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return -1;
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}
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if (ioctl(fd, BIOCVERSION, (caddr_t)&bv) < 0)
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{
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perror("BIOCVERSION");
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return -1;
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}
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if (bv.bv_major != BPF_MAJOR_VERSION ||
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bv.bv_minor < BPF_MINOR_VERSION)
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{
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fprintf(stderr, "kernel bpf (v%d.%d) filter out of date:\n",
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bv.bv_major, bv.bv_minor);
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fprintf(stderr, "current version: %d.%d\n",
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BPF_MAJOR_VERSION, BPF_MINOR_VERSION);
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return -1;
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}
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(void) strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
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if (ioctl(fd, BIOCSETIF, &ifr) == -1)
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{
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fprintf(stderr, "%s(%d):", ifr.ifr_name, fd);
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perror("BIOCSETIF");
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exit(1);
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}
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/*
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* get kernel buffer size
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*/
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if (ioctl(fd, BIOCGBLEN, &bufsize) == -1)
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{
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perror("BIOCSBLEN");
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exit(-1);
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}
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buf = (u_char*)malloc(bufsize);
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/*
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* set the timeout
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*/
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timeout = tout;
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to.tv_sec = 1;
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to.tv_usec = 0;
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if (ioctl(fd, BIOCSRTIMEOUT, (caddr_t)&to) == -1)
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{
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perror("BIOCSRTIMEOUT");
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exit(-1);
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}
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(void) ioctl(fd, BIOCFLUSH, 0);
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return fd;
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}
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/*
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* output an IP packet onto a fd opened for /dev/bpf
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*/
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int sendip(fd, pkt, len)
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int fd, len;
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char *pkt;
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{
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if (write(fd, pkt, len) == -1)
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{
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perror("send");
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return -1;
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}
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return len;
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}
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