471 lines
12 KiB
C
471 lines
12 KiB
C
/*
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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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/*
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* This doesn't actually test libpcap itself; it tests whether
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* valgrind properly handles the APIs libpcap uses. If it doesn't,
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* we end up getting patches submitted to "fix" references that
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* valgrind claims are being made to uninitialized data, when, in
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* fact, the OS isn't making any such references - or we get
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* valgrind *not* detecting *actual* incorrect references.
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*
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* Both BPF and Linux socket filters aren't handled correctly
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* by some versions of valgrind. See valgrind bug 318203 for
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* Linux:
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*
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* https://bugs.kde.org/show_bug.cgi?id=318203
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*
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* and valgrind bug 312989 for OS X:
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*
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* https://bugs.kde.org/show_bug.cgi?id=312989
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*
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* The fixes for both of those are checked into the official valgrind
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* repository.
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*
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* The unofficial FreeBSD port has similar issues to the official OS X
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* port, for similar reasons.
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*/
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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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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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 <fcntl.h>
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#include <errno.h>
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#include <arpa/inet.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#if defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
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/* BSD-flavored OS - use BPF */
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#define USE_BPF
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#elif defined(linux)
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/* Linux - use socket filters */
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#define USE_SOCKET_FILTERS
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#else
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#error "Unknown platform or platform that doesn't support Valgrind"
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#endif
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#if defined(USE_BPF)
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#include <sys/ioctl.h>
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#include <net/bpf.h>
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/*
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* Make "pcap.h" not include "pcap/bpf.h"; we are going to include the
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* native OS version, as we're going to be doing our own ioctls to
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* make sure that, in the uninitialized-data tests, the filters aren't
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* checked by libpcap before being handed to BPF.
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*/
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#define PCAP_DONT_INCLUDE_PCAP_BPF_H
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#elif defined(USE_SOCKET_FILTERS)
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#include <sys/socket.h>
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#include <linux/types.h>
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#include <linux/filter.h>
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#endif
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#include <pcap.h>
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static char *program_name;
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/*
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* This was introduced by Clang:
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*
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* http://clang.llvm.org/docs/LanguageExtensions.html#has-attribute
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*
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* in some version (which version?); it has been picked up by GCC 5.0.
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*/
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#ifndef __has_attribute
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/*
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* It's a macro, so you can check whether it's defined to check
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* whether it's supported.
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*
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* If it's not, define it to always return 0, so that we move on to
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* the fallback checks.
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*/
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#define __has_attribute(x) 0
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#endif
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#if __has_attribute(noreturn) \
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|| (defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 205)) \
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|| (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590)) \
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|| (defined(__xlC__) && __xlC__ >= 0x0A01) \
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|| (defined(__HP_aCC) && __HP_aCC >= 61000)
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/*
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* Compiler with support for it, or GCC 2.5 and later, or Solaris Studio 12
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* (Sun C 5.9) and later, or IBM XL C 10.1 and later (do any earlier
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* versions of XL C support this?), or HP aCC A.06.10 and later.
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*/
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#define PCAP_NORETURN __attribute((noreturn))
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#elif defined( _MSC_VER )
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#define PCAP_NORETURN __declspec(noreturn)
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#else
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#define PCAP_NORETURN
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#endif
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#if __has_attribute(__format__) \
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|| (defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 203)) \
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|| (defined(__xlC__) && __xlC__ >= 0x0A01) \
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|| (defined(__HP_aCC) && __HP_aCC >= 61000)
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/*
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* Compiler with support for it, or GCC 2.3 and later, or IBM XL C 10.1
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* and later (do any earlier versions of XL C support this?),
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* or HP aCC A.06.10 and later.
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*/
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#define PCAP_PRINTFLIKE(x,y) __attribute__((__format__(__printf__,x,y)))
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#else
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#define PCAP_PRINTFLIKE(x,y)
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#endif
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/* Forwards */
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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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/*
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* On Windows, we need to open the file in binary mode, so that
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* we get all the bytes specified by the size we get from "fstat()".
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* On UNIX, that's not necessary. O_BINARY is defined on Windows;
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* we define it as 0 if it's not defined, so it does nothing.
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*/
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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static char *
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read_infile(char *fname)
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{
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register int i, fd, cc;
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register char *cp;
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struct stat buf;
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fd = open(fname, O_RDONLY|O_BINARY);
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if (fd < 0)
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error("can't open %s: %s", fname, pcap_strerror(errno));
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if (fstat(fd, &buf) < 0)
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error("can't stat %s: %s", fname, pcap_strerror(errno));
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cp = malloc((u_int)buf.st_size + 1);
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if (cp == NULL)
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error("malloc(%d) for %s: %s", (u_int)buf.st_size + 1,
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fname, pcap_strerror(errno));
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cc = read(fd, cp, (u_int)buf.st_size);
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if (cc < 0)
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error("read %s: %s", fname, pcap_strerror(errno));
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if (cc != buf.st_size)
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error("short read %s (%d != %d)", fname, cc, (int)buf.st_size);
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close(fd);
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/* replace "# comment" with spaces */
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for (i = 0; i < cc; i++) {
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if (cp[i] == '#')
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while (i < cc && cp[i] != '\n')
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cp[i++] = ' ';
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}
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cp[cc] = '\0';
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return (cp);
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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 u_int 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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#define INSN_COUNT 17
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int
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main(int argc, char **argv)
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{
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char *cp, *device;
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int op;
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int dorfmon, useactivate;
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char ebuf[PCAP_ERRBUF_SIZE];
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char *infile;
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char *cmdbuf;
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pcap_t *pd;
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int status = 0;
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int pcap_fd;
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#if defined(USE_BPF)
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struct bpf_program bad_fcode;
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struct bpf_insn uninitialized[INSN_COUNT];
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#elif defined(USE_SOCKET_FILTERS)
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struct sock_fprog bad_fcode;
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struct sock_filter uninitialized[INSN_COUNT];
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#endif
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struct bpf_program fcode;
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device = NULL;
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dorfmon = 0;
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useactivate = 0;
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infile = NULL;
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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, "aF:i:I")) != -1) {
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switch (op) {
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case 'a':
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useactivate = 1;
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break;
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case 'F':
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infile = optarg;
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break;
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case 'i':
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device = optarg;
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break;
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case 'I':
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dorfmon = 1;
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useactivate = 1; /* required for rfmon */
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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 (device == NULL) {
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/*
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* No interface specified; get whatever pcap_lookupdev()
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* finds.
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*/
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device = pcap_lookupdev(ebuf);
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if (device == NULL) {
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error("couldn't find interface to use: %s",
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ebuf);
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}
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}
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if (infile != NULL) {
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/*
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* Filter specified with "-F" and a file containing
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* a filter.
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*/
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cmdbuf = read_infile(infile);
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} else {
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if (optind < argc) {
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/*
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* Filter specified with arguments on the
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* command line.
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*/
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cmdbuf = copy_argv(&argv[optind+1]);
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} else {
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/*
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* No filter specified; use an empty string, which
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* compiles to an "accept all" filter.
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*/
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cmdbuf = "";
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}
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}
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if (useactivate) {
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pd = pcap_create(device, ebuf);
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if (pd == NULL)
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error("%s: pcap_create() failed: %s", device, ebuf);
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status = pcap_set_snaplen(pd, 65535);
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if (status != 0)
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error("%s: pcap_set_snaplen failed: %s",
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device, pcap_statustostr(status));
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status = pcap_set_promisc(pd, 1);
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if (status != 0)
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error("%s: pcap_set_promisc failed: %s",
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device, pcap_statustostr(status));
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if (dorfmon) {
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status = pcap_set_rfmon(pd, 1);
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if (status != 0)
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error("%s: pcap_set_rfmon failed: %s",
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device, pcap_statustostr(status));
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}
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status = pcap_set_timeout(pd, 1000);
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if (status != 0)
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error("%s: pcap_set_timeout failed: %s",
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device, pcap_statustostr(status));
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status = pcap_activate(pd);
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if (status < 0) {
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/*
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* pcap_activate() failed.
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*/
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error("%s: %s\n(%s)", device,
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pcap_statustostr(status), pcap_geterr(pd));
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} else if (status > 0) {
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/*
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* pcap_activate() succeeded, but it's warning us
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* of a problem it had.
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*/
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warning("%s: %s\n(%s)", device,
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pcap_statustostr(status), pcap_geterr(pd));
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}
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} else {
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*ebuf = '\0';
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pd = pcap_open_live(device, 65535, 1, 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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}
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pcap_fd = pcap_fileno(pd);
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/*
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* Try setting a filter with an uninitialized bpf_program
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* structure. This should cause valgrind to report a
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* problem.
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*
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* We don't check for errors, because it could get an
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* error due to a bad pointer or count.
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*/
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#if defined(USE_BPF)
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ioctl(pcap_fd, BIOCSETF, &bad_fcode);
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#elif defined(USE_SOCKET_FILTERS)
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setsockopt(pcap_fd, SOL_SOCKET, SO_ATTACH_FILTER, &bad_fcode,
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sizeof(bad_fcode));
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#endif
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/*
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* Try setting a filter with an initialized bpf_program
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* structure that points to an uninitialized program.
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* That should also cause valgrind to report a problem.
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*
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* We don't check for errors, because it could get an
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* error due to a bad pointer or count.
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*/
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#if defined(USE_BPF)
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bad_fcode.bf_len = INSN_COUNT;
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bad_fcode.bf_insns = uninitialized;
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ioctl(pcap_fd, BIOCSETF, &bad_fcode);
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#elif defined(USE_SOCKET_FILTERS)
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bad_fcode.len = INSN_COUNT;
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bad_fcode.filter = uninitialized;
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setsockopt(pcap_fd, SOL_SOCKET, SO_ATTACH_FILTER, &bad_fcode,
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sizeof(bad_fcode));
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#endif
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/*
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* Now compile a filter and set the filter with that.
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* That should *not* cause valgrind to report a
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* problem.
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*/
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if (pcap_compile(pd, &fcode, cmdbuf, 1, 0) < 0)
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error("can't compile filter: %s", pcap_geterr(pd));
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if (pcap_setfilter(pd, &fcode) < 0)
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error("can't set filter: %s", pcap_geterr(pd));
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pcap_close(pd);
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exit(status < 0 ? 1 : 0);
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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, "%s, with %s\n", program_name,
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pcap_lib_version());
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(void)fprintf(stderr,
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"Usage: %s [-aI] [ -F file ] [ -I interface ] [ expression ]\n",
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program_name);
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exit(1);
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}
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