target/linux/etrax-2.6/image/e100boot/src/libpcap-0.4/pcap.c

   1 /*
   2  * Copyright (c) 1993, 1994, 1995, 1996, 1997, 1998
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the Computer Systems
  16  *      Engineering Group at Lawrence Berkeley Laboratory.
  17  * 4. Neither the name of the University nor of the Laboratory may be used
  18  *    to endorse or promote products derived from this software without
  19  *    specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifndef lint
  35 static const char rcsid[] =
  36     "@(#) $Header: /usr/local/cvs/linux/tools/build/e100boot/libpcap-0.4/pcap.c,v 1.1 1999/08/26 10:05:26 johana Exp $ (LBL)";
  37 #endif
  38
  39 #include <sys/types.h>
  40
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <unistd.h>
  45
  46 #include "gnuc.h"
  47 #ifdef HAVE_OS_PROTO_H
  48 #include "os-proto.h"
  49 #endif
  50
  51 #include "pcap-int.h"
  52
  53 int
  54 pcap_dispatch(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
  55 {
  56
  57         if (p->sf.rfile != NULL)
  58                 return (pcap_offline_read(p, cnt, callback, user));
  59         return (pcap_read(p, cnt, callback, user));
  60 }
  61
  62 int
  63 pcap_loop(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
  64 {
  65         register int n;
  66
  67         for (;;) {
  68                 if (p->sf.rfile != NULL)
  69                         n = pcap_offline_read(p, cnt, callback, user);
  70                 else {
  71                         /*
  72                          * XXX keep reading until we get something
  73                          * (or an error occurs)
  74                          */
  75                         do {
  76                                 n = pcap_read(p, cnt, callback, user);
  77                         } while (n == 0);
  78                 }
  79                 if (n <= 0)
  80                         return (n);
  81                 if (cnt > 0) {
  82                         cnt -= n;
  83                         if (cnt <= 0)
  84                                 return (0);
  85                 }
  86         }
  87 }
  88
  89 struct singleton {
  90         struct pcap_pkthdr *hdr;
  91         const u_char *pkt;
  92 };
  93
  94
  95 static void
  96 pcap_oneshot(u_char *userData, const struct pcap_pkthdr *h, const u_char *pkt)
  97 {
  98         struct singleton *sp = (struct singleton *)userData;
  99         *sp->hdr = *h;
 100         sp->pkt = pkt;
 101 }
 102
 103 const u_char *
 104 pcap_next(pcap_t *p, struct pcap_pkthdr *h)
 105 {
 106         struct singleton s;
 107
 108         s.hdr = h;
 109         if (pcap_dispatch(p, 1, pcap_oneshot, (u_char*)&s) <= 0)
 110                 return (0);
 111         return (s.pkt);
 112 }
 113
 114 int
 115 pcap_datalink(pcap_t *p)
 116 {
 117         return (p->linktype);
 118 }
 119
 120 int
 121 pcap_snapshot(pcap_t *p)
 122 {
 123         return (p->snapshot);
 124 }
 125
 126 int
 127 pcap_is_swapped(pcap_t *p)
 128 {
 129         return (p->sf.swapped);
 130 }
 131
 132 int
 133 pcap_major_version(pcap_t *p)
 134 {
 135         return (p->sf.version_major);
 136 }
 137
 138 int
 139 pcap_minor_version(pcap_t *p)
 140 {
 141         return (p->sf.version_minor);
 142 }
 143
 144 FILE *
 145 pcap_file(pcap_t *p)
 146 {
 147         return (p->sf.rfile);
 148 }
 149
 150 int
 151 pcap_fileno(pcap_t *p)
 152 {
 153         return (p->fd);
 154 }
 155
 156 void
 157 pcap_perror(pcap_t *p, char *prefix)
 158 {
 159         fprintf(stderr, "%s: %s\n", prefix, p->errbuf);
 160 }
 161
 162 char *
 163 pcap_geterr(pcap_t *p)
 164 {
 165         return (p->errbuf);
 166 }
 167
 168 /*
 169  * Not all systems have strerror().
 170  */
 171 char *
 172 pcap_strerror(int errnum)
 173 {
 174 #ifdef HAVE_STRERROR
 175         return (strerror(errnum));
 176 #else
 177         extern int sys_nerr;
 178         extern const char *const sys_errlist[];
 179         static char ebuf[20];
 180
 181         if ((unsigned int)errnum < sys_nerr)
 182                 return ((char *)sys_errlist[errnum]);
 183         (void)sprintf(ebuf, "Unknown error: %d", errnum);
 184         return(ebuf);
 185 #endif
 186 }
 187
 188 void
 189 pcap_close(pcap_t *p)
 190 {
 191         /*XXX*/
 192         if (p->fd >= 0)
 193                 close(p->fd);
 194         if (p->sf.rfile != NULL) {
 195                 (void)fclose(p->sf.rfile);
 196                 if (p->sf.base != NULL)
 197                         free(p->sf.base);
 198         } else if (p->buffer != NULL)
 199                 free(p->buffer);
 200 #ifdef linux
 201         if (p->md.device != NULL)
 202                 free(p->md.device);
 203 #endif
 204
 205         free(p);
 206 }