/* * Copyright (c) 1993, 1994, 1995, 1996, 1997, 1998 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the Computer Systems * Engineering Group at Lawrence Berkeley Laboratory. * 4. Neither the name of the University nor of the Laboratory may be used * to endorse or promote products derived from this software without * specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef lint static const char rcsid[] = "@(#) $Header: /tcpdump/master/libpcap/pcap.c,v 1.29.1.1 1999/10/07 23:46:40 mcr Exp $ (LBL)"; #endif #include #include #include #include #include #include "gnuc.h" #ifdef HAVE_OS_PROTO_H #include "os-proto.h" #endif #include "pcap-int.h" int pcap_dispatch(pcap_t *p, int cnt, pcap_handler callback, u_char *user) { if (p->sf.rfile != NULL) return (pcap_offline_read(p, cnt, callback, user)); return (pcap_read(p, cnt, callback, user)); } int pcap_loop(pcap_t *p, int cnt, pcap_handler callback, u_char *user) { register int n; for (;;) { if (p->sf.rfile != NULL) n = pcap_offline_read(p, cnt, callback, user); else { /* * XXX keep reading until we get something * (or an error occurs) */ do { n = pcap_read(p, cnt, callback, user); } while (n == 0); } if (n <= 0) return (n); if (cnt > 0) { cnt -= n; if (cnt <= 0) return (0); } } } struct singleton { struct pcap_pkthdr *hdr; const u_char *pkt; }; static void pcap_oneshot(u_char *userData, const struct pcap_pkthdr *h, const u_char *pkt) { struct singleton *sp = (struct singleton *)userData; *sp->hdr = *h; sp->pkt = pkt; } const u_char * pcap_next(pcap_t *p, struct pcap_pkthdr *h) { struct singleton s; s.hdr = h; if (pcap_dispatch(p, 1, pcap_oneshot, (u_char*)&s) <= 0) return (0); return (s.pkt); } int pcap_datalink(pcap_t *p) { return (p->linktype); } int pcap_snapshot(pcap_t *p) { return (p->snapshot); } int pcap_is_swapped(pcap_t *p) { return (p->sf.swapped); } int pcap_major_version(pcap_t *p) { return (p->sf.version_major); } int pcap_minor_version(pcap_t *p) { return (p->sf.version_minor); } FILE * pcap_file(pcap_t *p) { return (p->sf.rfile); } int pcap_fileno(pcap_t *p) { return (p->fd); } void pcap_perror(pcap_t *p, char *prefix) { fprintf(stderr, "%s: %s\n", prefix, p->errbuf); } char * pcap_geterr(pcap_t *p) { return (p->errbuf); } /* * Not all systems have strerror(). */ char * pcap_strerror(int errnum) { #ifdef HAVE_STRERROR return (strerror(errnum)); #else extern int sys_nerr; extern const char *const sys_errlist[]; static char ebuf[20]; if ((unsigned int)errnum < sys_nerr) return ((char *)sys_errlist[errnum]); (void)sprintf(ebuf, "Unknown error: %d", errnum); return(ebuf); #endif } void pcap_close(pcap_t *p) { /*XXX*/ if (p->fd >= 0) close(p->fd); if (p->sf.rfile != NULL) { (void)fclose(p->sf.rfile); if (p->sf.base != NULL) free(p->sf.base); } else if (p->buffer != NULL) free(p->buffer); #ifdef linux if (p->md.device != NULL) free(p->md.device); #endif free(p); }