265 lines
6.4 KiB
C
265 lines
6.4 KiB
C
/*
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* Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
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* Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
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* Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
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* Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
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* Copyright (c) 1999-2018 The strace developers.
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* 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 the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "defs.h"
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#include "xstring.h"
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SYS_FUNC(close)
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{
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printfd(tcp, tcp->u_arg[0]);
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return RVAL_DECODED;
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}
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SYS_FUNC(dup)
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{
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printfd(tcp, tcp->u_arg[0]);
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return RVAL_DECODED | RVAL_FD;
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}
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static int
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do_dup2(struct tcb *tcp, int flags_arg)
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{
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printfd(tcp, tcp->u_arg[0]);
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tprints(", ");
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printfd(tcp, tcp->u_arg[1]);
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if (flags_arg >= 0) {
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tprints(", ");
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printflags(open_mode_flags, tcp->u_arg[flags_arg], "O_???");
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}
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return RVAL_DECODED | RVAL_FD;
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}
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SYS_FUNC(dup2)
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{
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return do_dup2(tcp, -1);
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}
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SYS_FUNC(dup3)
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{
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return do_dup2(tcp, 2);
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}
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static int
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decode_select(struct tcb *const tcp, const kernel_ulong_t *const args,
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void (*const print_tv_ts) (struct tcb *, kernel_ulong_t),
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const char * (*const sprint_tv_ts) (struct tcb *, kernel_ulong_t))
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{
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int i, j;
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int nfds, fdsize;
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fd_set *fds = NULL;
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const char *sep;
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kernel_ulong_t addr;
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/* Kernel truncates args[0] to int, we do the same. */
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nfds = (int) args[0];
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/* Kernel rejects negative nfds, so we don't parse it either. */
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if (nfds < 0)
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nfds = 0;
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/* Beware of select(2^31-1, NULL, NULL, NULL) and similar... */
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if (nfds > 1024*1024)
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nfds = 1024*1024;
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/*
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* We had bugs a-la "while (j < args[0])" and "umoven(args[0])" below.
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* Instead of args[0], use nfds for fd count, fdsize for array lengths.
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*/
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fdsize = (((nfds + 7) / 8) + current_wordsize-1) & -current_wordsize;
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if (entering(tcp)) {
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tprintf("%d", (int) args[0]);
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if (verbose(tcp) && fdsize > 0)
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fds = malloc(fdsize);
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for (i = 0; i < 3; i++) {
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addr = args[i+1];
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tprints(", ");
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if (!fds) {
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printaddr(addr);
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continue;
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}
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if (umoven_or_printaddr(tcp, addr, fdsize, fds))
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continue;
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tprints("[");
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for (j = 0, sep = "";; j++) {
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j = next_set_bit(fds, j, nfds);
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if (j < 0)
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break;
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tprints(sep);
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printfd(tcp, j);
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sep = " ";
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}
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tprints("]");
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}
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free(fds);
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tprints(", ");
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print_tv_ts(tcp, args[4]);
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} else {
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static char outstr[1024];
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char *outptr;
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#define end_outstr (outstr + sizeof(outstr))
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int ready_fds;
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if (syserror(tcp))
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return 0;
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ready_fds = tcp->u_rval;
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if (ready_fds == 0) {
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tcp->auxstr = "Timeout";
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return RVAL_STR;
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}
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fds = malloc(fdsize);
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outptr = outstr;
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sep = "";
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for (i = 0; i < 3 && ready_fds > 0; i++) {
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int first = 1;
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addr = args[i+1];
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if (!addr || !fds || umoven(tcp, addr, fdsize, fds) < 0)
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continue;
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for (j = 0;; j++) {
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j = next_set_bit(fds, j, nfds);
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if (j < 0)
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break;
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/* +2 chars needed at the end: ']',NUL */
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if (outptr < end_outstr - (sizeof(", except [") + sizeof(int)*3 + 2)) {
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if (first) {
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outptr = xappendstr(outstr,
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outptr,
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"%s%s [%u",
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sep,
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i == 0 ? "in" : i == 1 ? "out" : "except",
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j
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);
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first = 0;
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sep = ", ";
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} else {
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outptr = xappendstr(outstr,
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outptr,
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" %u", j);
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}
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}
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if (--ready_fds == 0)
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break;
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}
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if (outptr != outstr)
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*outptr++ = ']';
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}
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free(fds);
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/* This contains no useful information on SunOS. */
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if (args[4]) {
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const char *str = sprint_tv_ts(tcp, args[4]);
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if (outptr + sizeof("left ") + strlen(sep) + strlen(str) < end_outstr) {
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outptr = xappendstr(outstr, outptr,
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"%sleft %s", sep, str);
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}
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}
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*outptr = '\0';
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tcp->auxstr = outstr;
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return RVAL_STR;
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#undef end_outstr
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}
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return 0;
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}
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#if HAVE_ARCH_OLD_SELECT
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SYS_FUNC(oldselect)
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{
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kernel_ulong_t *args =
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fetch_indirect_syscall_args(tcp, tcp->u_arg[0], 5);
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if (args) {
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return decode_select(tcp, args, print_timeval, sprint_timeval);
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} else {
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if (entering(tcp))
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printaddr(tcp->u_arg[0]);
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return RVAL_DECODED;
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}
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}
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#endif /* HAVE_ARCH_OLD_SELECT */
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#ifdef ALPHA
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SYS_FUNC(osf_select)
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{
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return decode_select(tcp, tcp->u_arg, print_timeval32, sprint_timeval32);
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}
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#endif
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SYS_FUNC(select)
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{
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return decode_select(tcp, tcp->u_arg, print_timeval, sprint_timeval);
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}
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static int
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umove_kulong_array_or_printaddr(struct tcb *const tcp, const kernel_ulong_t addr,
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kernel_ulong_t *const ptr, const size_t n)
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{
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#ifndef current_klongsize
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if (current_klongsize < sizeof(*ptr)) {
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uint32_t ptr32[n];
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int r = umove_or_printaddr(tcp, addr, &ptr32);
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if (!r) {
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size_t i;
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for (i = 0; i < n; ++i)
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ptr[i] = ptr32[i];
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}
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return r;
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}
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#endif /* !current_klongsize */
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return umoven_or_printaddr(tcp, addr, n * sizeof(*ptr), ptr);
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}
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SYS_FUNC(pselect6)
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{
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int rc = decode_select(tcp, tcp->u_arg, print_timespec, sprint_timespec);
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if (entering(tcp)) {
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kernel_ulong_t data[2];
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tprints(", ");
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if (!umove_kulong_array_or_printaddr(tcp, tcp->u_arg[5],
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data, ARRAY_SIZE(data))) {
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tprints("{");
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/* NB: kernel requires data[1] == NSIG_BYTES */
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print_sigset_addr_len(tcp, data[0], data[1]);
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tprintf(", %" PRI_klu "}", data[1]);
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}
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}
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return rc;
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}
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