/* $NetBSD: slinux.c,v 1.1.1.1 2012/03/23 21:20:06 christos Exp $ */ /* * (C)opyright 1992-1998 Darren Reed. (from tcplog) * * See the IPFILTER.LICENCE file for details on licencing. * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "ip_compat.h" #include "tcpip.h" #ifndef lint static const char sccsid[] = "@(#)slinux.c 1.1 12/3/95 (C) 1995 Darren Reed"; #endif #define BUFSPACE 32768 /* * Be careful to only include those defined in the flags option for the * interface are included in the header size. */ static int timeout; static char *eth_dev = NULL; int ack_recv(bp) char *bp; { struct tcpip tip; tcphdr_t *tcp; ip_t *ip; ip = (struct ip *)&tip; tcp = (tcphdr_t *)(ip + 1); bcopy(bp, (char *)&tip, sizeof(tip)); bcopy(bp + (ip.ip_hl << 2), (char *)tcp, sizeof(*tcp)); if (0 == detect(ip, tcp)) return 1; return 0; } void readloop(fd, port, dst) int fd, port; struct in_addr dst; { static u_char buf[BUFSPACE]; struct sockaddr dest; register u_char *bp = buf; register int cc; int dlen, done = 0; time_t now = time(NULL); do { fflush(stdout); dlen = sizeof(dest); bzero((char *)&dest, dlen); cc = recvfrom(fd, buf, BUFSPACE, 0, &dest, &dlen); if (!cc) if ((time(NULL) - now) > timeout) return done; else continue; if (bp[12] != 0x8 || bp[13] != 0) continue; /* not ip */ /* * get rid of non-tcp or fragmented packets here. */ if (cc >= sizeof(struct tcpiphdr)) { if (((bp[14+9] != IPPROTO_TCP) && (bp[14+9] != IPPROTO_UDP)) || (bp[14+6] & 0x1f) || (bp[14+6] & 0xff)) continue; done += ack_recv(bp + 14); } } while (cc >= 0); perror("read"); exit(-1); } int initdevice(dev, tout) char *dev; int tout; { int fd; eth_dev = strdup(dev); if ((fd = socket(AF_INET, SOCK_PACKET, htons(ETHERTYPE_IP))) == -1) { perror("socket(SOCK_PACKET)"); exit(-1); } return fd; }