| /* |
| * 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 1.32 2000-07-11 00:37:07 assar Exp $ (LBL)"; |
| #endif |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include <sys/types.h> |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.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)snprintf(ebuf, sizeof ebuf, "Unknown error: %d", errnum); |
| return(ebuf); |
| #endif |
| } |
| |
| pcap_t * |
| pcap_open_dead(int linktype, int snaplen) |
| { |
| pcap_t *p; |
| |
| p = malloc(sizeof(*p)); |
| if (p == NULL) |
| return NULL; |
| memset (p, 0, sizeof(*p)); |
| p->fd = -1; |
| p->snapshot = snaplen; |
| p->linktype = linktype; |
| return p; |
| } |
| |
| 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); |
| } |