18cf6c252SPaul Traina /* 28cf6c252SPaul Traina * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996 38cf6c252SPaul Traina * The Regents of the University of California. All rights reserved. 48cf6c252SPaul Traina * 58cf6c252SPaul Traina * Redistribution and use in source and binary forms, with or without 68cf6c252SPaul Traina * modification, are permitted provided that: (1) source code distributions 78cf6c252SPaul Traina * retain the above copyright notice and this paragraph in its entirety, (2) 88cf6c252SPaul Traina * distributions including binary code include the above copyright notice and 98cf6c252SPaul Traina * this paragraph in its entirety in the documentation or other materials 108cf6c252SPaul Traina * provided with the distribution, and (3) all advertising materials mentioning 118cf6c252SPaul Traina * features or use of this software display the following acknowledgement: 128cf6c252SPaul Traina * ``This product includes software developed by the University of California, 138cf6c252SPaul Traina * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 148cf6c252SPaul Traina * the University nor the names of its contributors may be used to endorse 158cf6c252SPaul Traina * or promote products derived from this software without specific prior 168cf6c252SPaul Traina * written permission. 178cf6c252SPaul Traina * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 188cf6c252SPaul Traina * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 198cf6c252SPaul Traina * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 203052b236SBill Fenner * 218cf6c252SPaul Traina * Modifications made to accommodate the new SunOS4.0 NIT facility by 228cf6c252SPaul Traina * Micky Liu, micky@cunixc.cc.columbia.edu, Columbia University in May, 1989. 238cf6c252SPaul Traina * This module now handles the STREAMS based NIT. 248cf6c252SPaul Traina */ 258cf6c252SPaul Traina 263052b236SBill Fenner #ifndef lint 273052b236SBill Fenner static const char rcsid[] = 28dc2c7305SBill Fenner "@(#) $Header: /tcpdump/master/libpcap/pcap-snit.c,v 1.54 2000/10/28 00:01:30 guy Exp $ (LBL)"; 29dc2c7305SBill Fenner #endif 30dc2c7305SBill Fenner 31dc2c7305SBill Fenner #ifdef HAVE_CONFIG_H 32dc2c7305SBill Fenner #include "config.h" 333052b236SBill Fenner #endif 343052b236SBill Fenner 358cf6c252SPaul Traina #include <sys/types.h> 368cf6c252SPaul Traina #include <sys/time.h> 378cf6c252SPaul Traina #include <sys/timeb.h> 388cf6c252SPaul Traina #include <sys/dir.h> 398cf6c252SPaul Traina #include <sys/fcntlcom.h> 408cf6c252SPaul Traina #include <sys/file.h> 418cf6c252SPaul Traina #include <sys/ioctl.h> 428cf6c252SPaul Traina #include <sys/socket.h> 438cf6c252SPaul Traina #include <sys/stropts.h> 448cf6c252SPaul Traina 458cf6c252SPaul Traina #include <net/if.h> 468cf6c252SPaul Traina #include <net/nit.h> 478cf6c252SPaul Traina #include <net/nit_if.h> 488cf6c252SPaul Traina #include <net/nit_pf.h> 498cf6c252SPaul Traina #include <net/nit_buf.h> 508cf6c252SPaul Traina 518cf6c252SPaul Traina #include <netinet/in.h> 528cf6c252SPaul Traina #include <netinet/in_systm.h> 538cf6c252SPaul Traina #include <netinet/ip.h> 548cf6c252SPaul Traina #include <netinet/if_ether.h> 558cf6c252SPaul Traina #include <netinet/ip_var.h> 568cf6c252SPaul Traina #include <netinet/udp.h> 578cf6c252SPaul Traina #include <netinet/udp_var.h> 588cf6c252SPaul Traina #include <netinet/tcp.h> 598cf6c252SPaul Traina #include <netinet/tcpip.h> 608cf6c252SPaul Traina 618cf6c252SPaul Traina #include <ctype.h> 628cf6c252SPaul Traina #include <errno.h> 638cf6c252SPaul Traina #include <stdio.h> 648cf6c252SPaul Traina #include <string.h> 658cf6c252SPaul Traina #include <unistd.h> 668cf6c252SPaul Traina 678cf6c252SPaul Traina #include "pcap-int.h" 688cf6c252SPaul Traina 698cf6c252SPaul Traina #ifdef HAVE_OS_PROTO_H 708cf6c252SPaul Traina #include "os-proto.h" 718cf6c252SPaul Traina #endif 728cf6c252SPaul Traina 738cf6c252SPaul Traina /* 748cf6c252SPaul Traina * The chunk size for NIT. This is the amount of buffering 758cf6c252SPaul Traina * done for read calls. 768cf6c252SPaul Traina */ 778cf6c252SPaul Traina #define CHUNKSIZE (2*1024) 788cf6c252SPaul Traina 798cf6c252SPaul Traina /* 808cf6c252SPaul Traina * The total buffer space used by NIT. 818cf6c252SPaul Traina */ 828cf6c252SPaul Traina #define BUFSPACE (4*CHUNKSIZE) 838cf6c252SPaul Traina 848cf6c252SPaul Traina /* Forwards */ 858cf6c252SPaul Traina static int nit_setflags(int, int, int, char *); 868cf6c252SPaul Traina 878cf6c252SPaul Traina int 888cf6c252SPaul Traina pcap_stats(pcap_t *p, struct pcap_stat *ps) 898cf6c252SPaul Traina { 908cf6c252SPaul Traina 918cf6c252SPaul Traina *ps = p->md.stat; 928cf6c252SPaul Traina return (0); 938cf6c252SPaul Traina } 948cf6c252SPaul Traina 958cf6c252SPaul Traina int 968cf6c252SPaul Traina pcap_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user) 978cf6c252SPaul Traina { 988cf6c252SPaul Traina register int cc, n; 998cf6c252SPaul Traina register struct bpf_insn *fcode = p->fcode.bf_insns; 1008cf6c252SPaul Traina register u_char *bp, *cp, *ep; 1018cf6c252SPaul Traina register struct nit_bufhdr *hdrp; 1028cf6c252SPaul Traina register struct nit_iftime *ntp; 1038cf6c252SPaul Traina register struct nit_iflen *nlp; 1048cf6c252SPaul Traina register struct nit_ifdrops *ndp; 1058cf6c252SPaul Traina register int caplen; 1068cf6c252SPaul Traina 1078cf6c252SPaul Traina cc = p->cc; 1088cf6c252SPaul Traina if (cc == 0) { 1098cf6c252SPaul Traina cc = read(p->fd, (char *)p->buffer, p->bufsize); 1108cf6c252SPaul Traina if (cc < 0) { 1118cf6c252SPaul Traina if (errno == EWOULDBLOCK) 1128cf6c252SPaul Traina return (0); 113dc2c7305SBill Fenner snprintf(p->errbuf, sizeof(p->errbuf), "pcap_read: %s", 1148cf6c252SPaul Traina pcap_strerror(errno)); 1158cf6c252SPaul Traina return (-1); 1168cf6c252SPaul Traina } 1178cf6c252SPaul Traina bp = p->buffer; 1188cf6c252SPaul Traina } else 1198cf6c252SPaul Traina bp = p->bp; 1208cf6c252SPaul Traina 1218cf6c252SPaul Traina /* 1228cf6c252SPaul Traina * loop through each snapshot in the chunk 1238cf6c252SPaul Traina */ 1248cf6c252SPaul Traina n = 0; 1258cf6c252SPaul Traina ep = bp + cc; 1268cf6c252SPaul Traina while (bp < ep) { 1278cf6c252SPaul Traina ++p->md.stat.ps_recv; 1288cf6c252SPaul Traina cp = bp; 1298cf6c252SPaul Traina 1308cf6c252SPaul Traina /* get past NIT buffer */ 1318cf6c252SPaul Traina hdrp = (struct nit_bufhdr *)cp; 1328cf6c252SPaul Traina cp += sizeof(*hdrp); 1338cf6c252SPaul Traina 1348cf6c252SPaul Traina /* get past NIT timer */ 1358cf6c252SPaul Traina ntp = (struct nit_iftime *)cp; 1368cf6c252SPaul Traina cp += sizeof(*ntp); 1378cf6c252SPaul Traina 1388cf6c252SPaul Traina ndp = (struct nit_ifdrops *)cp; 1398cf6c252SPaul Traina p->md.stat.ps_drop = ndp->nh_drops; 1408cf6c252SPaul Traina cp += sizeof *ndp; 1418cf6c252SPaul Traina 1428cf6c252SPaul Traina /* get past packet len */ 1438cf6c252SPaul Traina nlp = (struct nit_iflen *)cp; 1448cf6c252SPaul Traina cp += sizeof(*nlp); 1458cf6c252SPaul Traina 1468cf6c252SPaul Traina /* next snapshot */ 1478cf6c252SPaul Traina bp += hdrp->nhb_totlen; 1488cf6c252SPaul Traina 1498cf6c252SPaul Traina caplen = nlp->nh_pktlen; 1508cf6c252SPaul Traina if (caplen > p->snapshot) 1518cf6c252SPaul Traina caplen = p->snapshot; 1528cf6c252SPaul Traina 1538cf6c252SPaul Traina if (bpf_filter(fcode, cp, nlp->nh_pktlen, caplen)) { 1548cf6c252SPaul Traina struct pcap_pkthdr h; 1558cf6c252SPaul Traina h.ts = ntp->nh_timestamp; 1568cf6c252SPaul Traina h.len = nlp->nh_pktlen; 1578cf6c252SPaul Traina h.caplen = caplen; 1588cf6c252SPaul Traina (*callback)(user, &h, cp); 1598cf6c252SPaul Traina if (++n >= cnt && cnt >= 0) { 1608cf6c252SPaul Traina p->cc = ep - bp; 1618cf6c252SPaul Traina p->bp = bp; 1628cf6c252SPaul Traina return (n); 1638cf6c252SPaul Traina } 1648cf6c252SPaul Traina } 1658cf6c252SPaul Traina } 1668cf6c252SPaul Traina p->cc = 0; 1678cf6c252SPaul Traina return (n); 1688cf6c252SPaul Traina } 1698cf6c252SPaul Traina 1708cf6c252SPaul Traina static int 1718cf6c252SPaul Traina nit_setflags(int fd, int promisc, int to_ms, char *ebuf) 1728cf6c252SPaul Traina { 1738cf6c252SPaul Traina bpf_u_int32 flags; 1748cf6c252SPaul Traina struct strioctl si; 1758cf6c252SPaul Traina struct timeval timeout; 1768cf6c252SPaul Traina 1778cf6c252SPaul Traina si.ic_timout = INFTIM; 1788cf6c252SPaul Traina if (to_ms != 0) { 1798cf6c252SPaul Traina timeout.tv_sec = to_ms / 1000; 1808cf6c252SPaul Traina timeout.tv_usec = (to_ms * 1000) % 1000000; 1818cf6c252SPaul Traina si.ic_cmd = NIOCSTIME; 1828cf6c252SPaul Traina si.ic_len = sizeof(timeout); 1838cf6c252SPaul Traina si.ic_dp = (char *)&timeout; 1848cf6c252SPaul Traina if (ioctl(fd, I_STR, (char *)&si) < 0) { 185dc2c7305SBill Fenner snprintf(ebuf, PCAP_ERRBUF_SIZE, "NIOCSTIME: %s", 186dc2c7305SBill Fenner pcap_strerror(errno)); 1878cf6c252SPaul Traina return (-1); 1888cf6c252SPaul Traina } 1898cf6c252SPaul Traina } 1908cf6c252SPaul Traina flags = NI_TIMESTAMP | NI_LEN | NI_DROPS; 1918cf6c252SPaul Traina if (promisc) 1928cf6c252SPaul Traina flags |= NI_PROMISC; 1938cf6c252SPaul Traina si.ic_cmd = NIOCSFLAGS; 1948cf6c252SPaul Traina si.ic_len = sizeof(flags); 1958cf6c252SPaul Traina si.ic_dp = (char *)&flags; 1968cf6c252SPaul Traina if (ioctl(fd, I_STR, (char *)&si) < 0) { 197dc2c7305SBill Fenner snprintf(ebuf, PCAP_ERRBUF_SIZE, "NIOCSFLAGS: %s", 198dc2c7305SBill Fenner pcap_strerror(errno)); 1998cf6c252SPaul Traina return (-1); 2008cf6c252SPaul Traina } 2018cf6c252SPaul Traina return (0); 2028cf6c252SPaul Traina } 2038cf6c252SPaul Traina 2048cf6c252SPaul Traina pcap_t * 2058cf6c252SPaul Traina pcap_open_live(char *device, int snaplen, int promisc, int to_ms, char *ebuf) 2068cf6c252SPaul Traina { 2078cf6c252SPaul Traina struct strioctl si; /* struct for ioctl() */ 2088cf6c252SPaul Traina struct ifreq ifr; /* interface request struct */ 2098cf6c252SPaul Traina int chunksize = CHUNKSIZE; 2108cf6c252SPaul Traina int fd; 2118cf6c252SPaul Traina static char dev[] = "/dev/nit"; 2128cf6c252SPaul Traina register pcap_t *p; 2138cf6c252SPaul Traina 2148cf6c252SPaul Traina p = (pcap_t *)malloc(sizeof(*p)); 2158cf6c252SPaul Traina if (p == NULL) { 216dc2c7305SBill Fenner strlcpy(ebuf, pcap_strerror(errno), PCAP_ERRBUF_SIZE); 2178cf6c252SPaul Traina return (NULL); 2188cf6c252SPaul Traina } 2198cf6c252SPaul Traina 2208cf6c252SPaul Traina if (snaplen < 96) 2218cf6c252SPaul Traina /* 2228cf6c252SPaul Traina * NIT requires a snapshot length of at least 96. 2238cf6c252SPaul Traina */ 2248cf6c252SPaul Traina snaplen = 96; 2258cf6c252SPaul Traina 226dc2c7305SBill Fenner memset(p, 0, sizeof(*p)); 2278cf6c252SPaul Traina p->fd = fd = open(dev, O_RDONLY); 2288cf6c252SPaul Traina if (fd < 0) { 229dc2c7305SBill Fenner snprintf(ebuf, PCAP_ERRBUF_SIZE, "%s: %s", dev, 230dc2c7305SBill Fenner pcap_strerror(errno)); 2318cf6c252SPaul Traina goto bad; 2328cf6c252SPaul Traina } 2338cf6c252SPaul Traina 2348cf6c252SPaul Traina /* arrange to get discrete messages from the STREAM and use NIT_BUF */ 2358cf6c252SPaul Traina if (ioctl(fd, I_SRDOPT, (char *)RMSGD) < 0) { 236dc2c7305SBill Fenner snprintf(ebuf, PCAP_ERRBUF_SIZE, "I_SRDOPT: %s", 237dc2c7305SBill Fenner pcap_strerror(errno)); 2388cf6c252SPaul Traina goto bad; 2398cf6c252SPaul Traina } 2408cf6c252SPaul Traina if (ioctl(fd, I_PUSH, "nbuf") < 0) { 241dc2c7305SBill Fenner snprintf(ebuf, PCAP_ERRBUF_SIZE, "push nbuf: %s", 242dc2c7305SBill Fenner pcap_strerror(errno)); 2438cf6c252SPaul Traina goto bad; 2448cf6c252SPaul Traina } 2458cf6c252SPaul Traina /* set the chunksize */ 2468cf6c252SPaul Traina si.ic_cmd = NIOCSCHUNK; 2478cf6c252SPaul Traina si.ic_timout = INFTIM; 2488cf6c252SPaul Traina si.ic_len = sizeof(chunksize); 2498cf6c252SPaul Traina si.ic_dp = (char *)&chunksize; 2508cf6c252SPaul Traina if (ioctl(fd, I_STR, (char *)&si) < 0) { 251dc2c7305SBill Fenner snprintf(ebuf, PCAP_ERRBUF_SIZE, "NIOCSCHUNK: %s", 252dc2c7305SBill Fenner pcap_strerror(errno)); 2538cf6c252SPaul Traina goto bad; 2548cf6c252SPaul Traina } 2558cf6c252SPaul Traina 2568cf6c252SPaul Traina /* request the interface */ 2578cf6c252SPaul Traina strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name)); 2588cf6c252SPaul Traina ifr.ifr_name[sizeof(ifr.ifr_name) - 1] = ' '; 2598cf6c252SPaul Traina si.ic_cmd = NIOCBIND; 2608cf6c252SPaul Traina si.ic_len = sizeof(ifr); 2618cf6c252SPaul Traina si.ic_dp = (char *)𝔦 2628cf6c252SPaul Traina if (ioctl(fd, I_STR, (char *)&si) < 0) { 263dc2c7305SBill Fenner snprintf(ebuf, PCAP_ERRBUF_SIZE, "NIOCBIND: %s: %s", 2648cf6c252SPaul Traina ifr.ifr_name, pcap_strerror(errno)); 2658cf6c252SPaul Traina goto bad; 2668cf6c252SPaul Traina } 2678cf6c252SPaul Traina 2688cf6c252SPaul Traina /* set the snapshot length */ 2698cf6c252SPaul Traina si.ic_cmd = NIOCSSNAP; 2708cf6c252SPaul Traina si.ic_len = sizeof(snaplen); 2718cf6c252SPaul Traina si.ic_dp = (char *)&snaplen; 2728cf6c252SPaul Traina if (ioctl(fd, I_STR, (char *)&si) < 0) { 273dc2c7305SBill Fenner snprintf(ebuf, PCAP_ERRBUF_SIZE, "NIOCSSNAP: %s", 274dc2c7305SBill Fenner pcap_strerror(errno)); 2758cf6c252SPaul Traina goto bad; 2768cf6c252SPaul Traina } 2778cf6c252SPaul Traina p->snapshot = snaplen; 2788cf6c252SPaul Traina if (nit_setflags(p->fd, promisc, to_ms, ebuf) < 0) 2798cf6c252SPaul Traina goto bad; 2808cf6c252SPaul Traina 2818cf6c252SPaul Traina (void)ioctl(fd, I_FLUSH, (char *)FLUSHR); 2828cf6c252SPaul Traina /* 2838cf6c252SPaul Traina * NIT supports only ethernets. 2848cf6c252SPaul Traina */ 2858cf6c252SPaul Traina p->linktype = DLT_EN10MB; 2868cf6c252SPaul Traina 2878cf6c252SPaul Traina p->bufsize = BUFSPACE; 2888cf6c252SPaul Traina p->buffer = (u_char *)malloc(p->bufsize); 2898cf6c252SPaul Traina if (p->buffer == NULL) { 290dc2c7305SBill Fenner strlcpy(ebuf, pcap_strerror(errno), PCAP_ERRBUF_SIZE); 2918cf6c252SPaul Traina goto bad; 2928cf6c252SPaul Traina } 2938cf6c252SPaul Traina return (p); 2948cf6c252SPaul Traina bad: 2958cf6c252SPaul Traina if (fd >= 0) 2968cf6c252SPaul Traina close(fd); 2978cf6c252SPaul Traina free(p); 2988cf6c252SPaul Traina return (NULL); 2998cf6c252SPaul Traina } 3008cf6c252SPaul Traina 3018cf6c252SPaul Traina int 3028cf6c252SPaul Traina pcap_setfilter(pcap_t *p, struct bpf_program *fp) 3038cf6c252SPaul Traina { 3048cf6c252SPaul Traina 305dc2c7305SBill Fenner if (install_bpf_program(p, fp) < 0) 306dc2c7305SBill Fenner return (-1); 3078cf6c252SPaul Traina return (0); 3088cf6c252SPaul Traina } 309