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446 lines
11 KiB
446 lines
11 KiB
/*
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* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#include "varattrs.h"
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#ifndef lint
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static const char copyright[] _U_ =
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"@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif
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/*
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* Tests how select() and poll() behave on the selectable file descriptor
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* for a pcap_t.
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*
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* This would be significantly different on Windows, as it'd test
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* how WaitForMultipleObjects() would work on the event handle for a
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* pcap_t.
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*/
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#include <pcap.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdarg.h>
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#include <unistd.h>
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#include <errno.h>
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#include <sys/types.h>
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#ifdef HAVE_SYS_SELECT_H
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#include <sys/select.h>
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#else
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#include <sys/time.h> /* older UN*Xes */
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#endif
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#include <poll.h>
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#include "pcap/funcattrs.h"
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static char *program_name;
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/* Forwards */
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static void countme(u_char *, const struct pcap_pkthdr *, const u_char *);
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static void PCAP_NORETURN usage(void);
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static void PCAP_NORETURN error(const char *, ...) PCAP_PRINTFLIKE(1, 2);
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static void warning(const char *, ...) PCAP_PRINTFLIKE(1, 2);
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static char *copy_argv(char **);
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static pcap_t *pd;
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int
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main(int argc, char **argv)
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{
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register int op;
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bpf_u_int32 localnet, netmask;
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register char *cp, *cmdbuf, *device;
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int doselect, dopoll, dotimeout, dononblock, quiet;
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const char *mechanism;
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struct bpf_program fcode;
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char ebuf[PCAP_ERRBUF_SIZE];
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pcap_if_t *devlist;
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int selectable_fd;
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const struct timeval *required_timeout;
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int status;
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int packet_count;
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device = NULL;
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doselect = 0;
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dopoll = 0;
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mechanism = NULL;
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dotimeout = 0;
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dononblock = 0;
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quiet = 0;
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if ((cp = strrchr(argv[0], '/')) != NULL)
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program_name = cp + 1;
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else
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program_name = argv[0];
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opterr = 0;
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while ((op = getopt(argc, argv, "i:sptnq")) != -1) {
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switch (op) {
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case 'i':
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device = optarg;
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break;
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case 's':
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doselect = 1;
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mechanism = "select() and pcap_dispatch()";
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break;
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case 'p':
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dopoll = 1;
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mechanism = "poll() and pcap_dispatch()";
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break;
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case 't':
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dotimeout = 1;
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break;
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case 'n':
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dononblock = 1;
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break;
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case 'q':
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quiet = 1;
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break;
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default:
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usage();
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/* NOTREACHED */
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}
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}
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if (doselect && dopoll) {
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fprintf(stderr, "selpolltest: choose select (-s) or poll (-p), but not both\n");
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return 1;
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}
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if (dotimeout && !doselect && !dopoll) {
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fprintf(stderr, "selpolltest: timeout (-t) requires select (-s) or poll (-p)\n");
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return 1;
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}
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if (device == NULL) {
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if (pcap_findalldevs(&devlist, ebuf) == -1)
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error("%s", ebuf);
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if (devlist == NULL)
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error("no interfaces available for capture");
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device = strdup(devlist->name);
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pcap_freealldevs(devlist);
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}
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*ebuf = '\0';
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pd = pcap_open_live(device, 65535, 0, 1000, ebuf);
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if (pd == NULL)
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error("%s", ebuf);
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else if (*ebuf)
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warning("%s", ebuf);
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if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
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localnet = 0;
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netmask = 0;
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warning("%s", ebuf);
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}
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cmdbuf = copy_argv(&argv[optind]);
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if (pcap_compile(pd, &fcode, cmdbuf, 1, netmask) < 0)
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error("%s", pcap_geterr(pd));
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if (pcap_setfilter(pd, &fcode) < 0)
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error("%s", pcap_geterr(pd));
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if (doselect || dopoll) {
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/*
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* We need either an FD on which to do select()/poll()
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* or, if there isn't one, a timeout to use in select()/
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* poll().
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*/
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selectable_fd = pcap_get_selectable_fd(pd);
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if (selectable_fd == -1) {
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printf("Listening on %s, using %s, with a timeout\n",
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device, mechanism);
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required_timeout = pcap_get_required_select_timeout(pd);
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if (required_timeout == NULL)
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error("select()/poll() isn't supported on %s, even with a timeout",
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device);
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/*
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* As we won't be notified by select() or poll()
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* that a read can be done, we'll have to periodically
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* try reading from the device every time the required
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* timeout expires, and we don't want those attempts
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* to block if nothing has arrived in that interval,
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* so we want to force non-blocking mode.
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*/
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dononblock = 1;
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} else {
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printf("Listening on %s, using %s\n", device,
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mechanism);
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required_timeout = NULL;
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}
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} else
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printf("Listening on %s, using pcap_dispatch()\n", device);
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if (dononblock) {
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if (pcap_setnonblock(pd, 1, ebuf) == -1)
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error("pcap_setnonblock failed: %s", ebuf);
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}
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if (doselect) {
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for (;;) {
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fd_set setread, setexcept;
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struct timeval seltimeout;
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struct timeval *timeoutp;
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FD_ZERO(&setread);
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if (selectable_fd != -1) {
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FD_SET(selectable_fd, &setread);
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FD_ZERO(&setexcept);
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FD_SET(selectable_fd, &setexcept);
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}
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required_timeout = pcap_get_required_select_timeout(pd);
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if (dotimeout) {
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seltimeout.tv_sec = 0;
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if (required_timeout != NULL &&
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required_timeout->tv_usec < 1000)
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seltimeout.tv_usec = required_timeout->tv_usec;
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else
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seltimeout.tv_usec = 1000;
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timeoutp = &seltimeout;
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} else if (required_timeout != NULL) {
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seltimeout = *required_timeout;
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timeoutp = &seltimeout;
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} else {
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timeoutp = NULL;
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}
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status = select((selectable_fd == -1) ?
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0 : selectable_fd + 1, &setread, NULL, &setexcept,
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timeoutp);
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if (status == -1) {
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printf("Select returns error (%s)\n",
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strerror(errno));
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} else {
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if (!quiet) {
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if (status == 0)
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printf("Select timed out: ");
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else{
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printf("Select returned a descriptor: ");
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if (FD_ISSET(selectable_fd, &setread))
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printf("readable, ");
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else
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printf("not readable, ");
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if (FD_ISSET(selectable_fd, &setexcept))
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printf("exceptional condition\n");
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else
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printf("no exceptional condition\n");
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}
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}
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packet_count = 0;
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status = pcap_dispatch(pd, -1, countme,
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(u_char *)&packet_count);
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if (status < 0)
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break;
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/*
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* Don't report this if we're using a
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* required timeout and we got no packets,
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* because that could be a very short timeout,
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* and we don't want to spam the user with
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* a ton of "no packets" reports.
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*/
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if (status != 0 || packet_count != 0 ||
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required_timeout != NULL) {
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printf("%d packets seen, %d packets counted after select returns\n",
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status, packet_count);
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}
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}
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}
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} else if (dopoll) {
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for (;;) {
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struct pollfd fd;
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int polltimeout;
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fd.fd = selectable_fd;
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fd.events = POLLIN;
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required_timeout = pcap_get_required_select_timeout(pd);
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if (dotimeout)
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polltimeout = 1;
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else if (required_timeout != NULL &&
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required_timeout->tv_usec >= 1000)
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polltimeout = (int)(required_timeout->tv_usec/1000);
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else
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polltimeout = -1;
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status = poll(&fd, (selectable_fd == -1) ? 0 : 1, polltimeout);
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if (status == -1) {
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printf("Poll returns error (%s)\n",
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strerror(errno));
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} else {
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if (!quiet) {
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if (status == 0)
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printf("Poll timed out\n");
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else {
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printf("Poll returned a descriptor: ");
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if (fd.revents & POLLIN)
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printf("readable, ");
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else
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printf("not readable, ");
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if (fd.revents & POLLERR)
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printf("exceptional condition, ");
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else
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printf("no exceptional condition, ");
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if (fd.revents & POLLHUP)
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printf("disconnect, ");
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else
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printf("no disconnect, ");
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if (fd.revents & POLLNVAL)
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printf("invalid\n");
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else
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printf("not invalid\n");
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}
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}
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packet_count = 0;
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status = pcap_dispatch(pd, -1, countme,
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(u_char *)&packet_count);
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if (status < 0)
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break;
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/*
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* Don't report this if we're using a
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* required timeout and we got no packets,
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* because that could be a very short timeout,
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* and we don't want to spam the user with
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* a ton of "no packets" reports.
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*/
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if (status != 0 || packet_count != 0 ||
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required_timeout != NULL) {
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printf("%d packets seen, %d packets counted after poll returns\n",
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status, packet_count);
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}
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}
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}
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} else {
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for (;;) {
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packet_count = 0;
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status = pcap_dispatch(pd, -1, countme,
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(u_char *)&packet_count);
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if (status < 0)
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break;
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printf("%d packets seen, %d packets counted after pcap_dispatch returns\n",
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status, packet_count);
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}
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}
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if (status == -2) {
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/*
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* We got interrupted, so perhaps we didn't
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* manage to finish a line we were printing.
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* Print an extra newline, just in case.
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*/
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putchar('\n');
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}
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(void)fflush(stdout);
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if (status == -1) {
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/*
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* Error. Report it.
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*/
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(void)fprintf(stderr, "%s: pcap_dispatch: %s\n",
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program_name, pcap_geterr(pd));
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}
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pcap_close(pd);
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exit(status == -1 ? 1 : 0);
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}
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static void
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countme(u_char *user, const struct pcap_pkthdr *h _U_, const u_char *sp _U_)
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{
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int *counterp = (int *)user;
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(*counterp)++;
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr, "Usage: %s [ -sptnq ] [ -i interface ] [expression]\n",
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program_name);
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exit(1);
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}
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/* VARARGS */
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static void
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error(const char *fmt, ...)
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{
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va_list ap;
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(void)fprintf(stderr, "%s: ", program_name);
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va_start(ap, fmt);
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(void)vfprintf(stderr, fmt, ap);
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va_end(ap);
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if (*fmt) {
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fmt += strlen(fmt);
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if (fmt[-1] != '\n')
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(void)fputc('\n', stderr);
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}
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exit(1);
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/* NOTREACHED */
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}
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/* VARARGS */
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static void
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warning(const char *fmt, ...)
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{
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va_list ap;
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(void)fprintf(stderr, "%s: WARNING: ", program_name);
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va_start(ap, fmt);
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(void)vfprintf(stderr, fmt, ap);
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va_end(ap);
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if (*fmt) {
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fmt += strlen(fmt);
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if (fmt[-1] != '\n')
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(void)fputc('\n', stderr);
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}
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}
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/*
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* Copy arg vector into a new buffer, concatenating arguments with spaces.
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*/
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static char *
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copy_argv(register char **argv)
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{
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register char **p;
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register size_t len = 0;
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char *buf;
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char *src, *dst;
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p = argv;
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if (*p == 0)
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return 0;
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while (*p)
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len += strlen(*p++) + 1;
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buf = (char *)malloc(len);
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if (buf == NULL)
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error("copy_argv: malloc");
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p = argv;
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dst = buf;
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while ((src = *p++) != NULL) {
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while ((*dst++ = *src++) != '\0')
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;
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dst[-1] = ' ';
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}
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dst[-1] = '\0';
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return buf;
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}
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