/* $NetBSD: snit.c,v 1.2 2012/07/22 14:27:36 darrenr 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 #include #include #include #include #include #include #include #include #include #include #include "ipsend.h" #if !defined(lint) static const char sccsid[] = "@(#)snit.c 1.5 1/11/96 (C)1995 Darren Reed"; static const char rcsid[] = "@(#)Id: snit.c,v 1.1.1.2 2012/07/22 13:44:37 darrenr Exp $"; #endif #define CHUNKSIZE 8192 #define BUFSPACE (4*CHUNKSIZE) /* * Be careful to only include those defined in the flags option for the * interface are included in the header size. */ #define BUFHDR_SIZE (sizeof(struct nit_bufhdr)) #define NIT_HDRSIZE (BUFHDR_SIZE) static int timeout; int initdevice(device, tout) char *device; int tout; { struct strioctl si; struct timeval to; struct ifreq ifr; int fd; if ((fd = open("/dev/nit", O_RDWR)) < 0) { perror("/dev/nit"); exit(-1); } /* * arrange to get messages from the NIT STREAM and use NIT_BUF option */ ioctl(fd, I_SRDOPT, (char*)RMSGD); ioctl(fd, I_PUSH, "nbuf"); /* * set the timeout */ timeout = tout; si.ic_timout = 1; to.tv_sec = 1; to.tv_usec = 0; si.ic_cmd = NIOCSTIME; si.ic_len = sizeof(to); si.ic_dp = (char*)&to; if (ioctl(fd, I_STR, (char*)&si) == -1) { perror("ioctl: NIT timeout"); exit(-1); } /* * request the interface */ strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name)); ifr.ifr_name[sizeof(ifr.ifr_name) - 1] = ' '; si.ic_cmd = NIOCBIND; si.ic_len = sizeof(ifr); si.ic_dp = (char*)𝔦 if (ioctl(fd, I_STR, (char*)&si) == -1) { perror(ifr.ifr_name); exit(1); } return fd; } /* * output an IP packet onto a fd opened for /dev/nit */ int sendip(fd, pkt, len) int fd, len; char *pkt; { struct sockaddr sk, *sa = &sk; struct strbuf cbuf, *cp = &cbuf, dbuf, *dp = &dbuf; /* * For ethernet, need at least 802.3 header and IP header. */ if (len < (sizeof(sa->sa_data) + sizeof(struct ip))) return -1; /* * to avoid any output processing for IP, say we're not. */ sa->sa_family = AF_UNSPEC; bcopy(pkt, sa->sa_data, sizeof(sa->sa_data)); pkt += sizeof(sa->sa_data); len -= sizeof(sa->sa_data); /* * construct NIT STREAMS messages, first control then data. */ cp->len = sizeof(*sa); cp->maxlen = sizeof(*sa); cp->buf = (char *)sa; dp->buf = pkt; dp->len = len; dp->maxlen = dp->len; if (putmsg(fd, cp, dp, 0) == -1) { perror("putmsg"); return -1; } if (ioctl(fd, I_FLUSH, FLUSHW) == -1) { perror("I_FLUSH"); return -1; } return len; }