122 lines
2.3 KiB
C
122 lines
2.3 KiB
C
/* $NetBSD: slinux.c,v 1.2 2002/01/24 08:21:38 martti Exp $ */
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/*
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* (C)opyright 1992-1998 Darren Reed. (from tcplog)
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*
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* See the IPFILTER.LICENCE file for details on licencing.
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*
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* The author of this software makes no garuntee about the
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* performance of this package or its suitability to fulfill any purpose.
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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 <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/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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#include <sys/dir.h>
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#include <linux/netdevice.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <netinet/tcp.h>
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#include "ip_compat.h"
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#include "tcpip.h"
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#ifndef lint
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static const char sccsid[] = "@(#)slinux.c 1.1 12/3/95 (C) 1995 Darren Reed";
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#endif
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#define BUFSPACE 32768
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/*
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* Be careful to only include those defined in the flags option for the
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* interface are included in the header size.
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*/
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static int timeout;
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static char *eth_dev = NULL;
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int ack_recv(bp)
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char *bp;
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{
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struct tcpip tip;
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tcphdr_t *tcp;
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ip_t *ip;
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ip = (struct ip *)&tip;
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tcp = (tcphdr_t *)(ip + 1);
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bcopy(bp, (char *)&tip, sizeof(tip));
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bcopy(bp + (ip.ip_hl << 2), (char *)tcp, sizeof(*tcp));
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if (0 == detect(ip, tcp))
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return 1;
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return 0;
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}
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void readloop(fd, port, dst)
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int fd, port;
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struct in_addr dst;
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{
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static u_char buf[BUFSPACE];
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struct sockaddr dest;
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register u_char *bp = buf;
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register int cc;
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int dlen, done = 0;
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time_t now = time(NULL);
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do {
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fflush(stdout);
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dlen = sizeof(dest);
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bzero((char *)&dest, dlen);
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cc = recvfrom(fd, buf, BUFSPACE, 0, &dest, &dlen);
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if (!cc)
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if ((time(NULL) - now) > timeout)
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return done;
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else
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continue;
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if (bp[12] != 0x8 || bp[13] != 0)
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continue; /* not ip */
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/*
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* get rid of non-tcp or fragmented packets here.
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*/
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if (cc >= sizeof(struct tcpiphdr))
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{
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if (((bp[14+9] != IPPROTO_TCP) &&
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(bp[14+9] != IPPROTO_UDP)) ||
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(bp[14+6] & 0x1f) || (bp[14+6] & 0xff))
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continue;
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done += ack_recv(bp + 14);
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}
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} while (cc >= 0);
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perror("read");
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exit(-1);
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}
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int initdevice(dev, tout)
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char *dev;
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int tout;
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{
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int fd;
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eth_dev = strdup(dev);
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if ((fd = socket(AF_INET, SOCK_PACKET, htons(ETHERTYPE_IP))) == -1)
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{
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perror("socket(SOCK_PACKET)");
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exit(-1);
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}
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return fd;
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}
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