2 /*--------------------------------------------------------------------*/
3 /*--- Command line handling. m_commandline.c ---*/
4 /*--------------------------------------------------------------------*/
7 This file is part of Valgrind, a dynamic binary instrumentation
10 Copyright (C) 2000-2010 Julian Seward
13 This program is free software; you can redistribute it and/or
14 modify it under the terms of the GNU General Public License as
15 published by the Free Software Foundation; either version 2 of the
16 License, or (at your option) any later version.
18 This program is distributed in the hope that it will be useful, but
19 WITHOUT ANY WARRANTY; without even the implied warranty of
20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 General Public License for more details.
23 You should have received a copy of the GNU General Public License
24 along with this program; if not, write to the Free Software
25 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
28 The GNU General Public License is contained in the file COPYING.
31 #include "pub_core_basics.h"
32 #include "pub_core_vki.h"
33 #include "pub_core_libcassert.h"
34 #include "pub_core_libcbase.h"
35 #include "pub_core_libcfile.h"
36 #include "pub_core_libcprint.h"
37 #include "pub_core_libcproc.h"
38 #include "pub_core_mallocfree.h"
39 #include "pub_core_xarray.h"
40 #include "pub_core_clientstate.h"
41 #include "pub_core_commandline.h" /* self */
44 /* Add a string to an expandable array of strings. */
46 static void add_string ( XArray* /* of HChar* */xa, HChar* str )
48 (void) VG_(addToXA)( xa, (void*)(&str) );
52 /* Read the contents of .valgrindrc in 'dir' into malloc'd memory. */
53 // Note that we deliberately don't free the malloc'd memory. See
54 // comment at call site.
56 static HChar* read_dot_valgrindrc ( HChar* dir )
60 struct vg_stat stat_buf;
62 HChar filename[VKI_PATH_MAX];
64 VG_(snprintf)(filename, VKI_PATH_MAX, "%s/.valgrindrc",
65 ( NULL == dir ? "" : dir ) );
66 fd = VG_(open)(filename, 0, VKI_S_IRUSR);
67 if ( !sr_isError(fd) ) {
68 Int res = VG_(fstat)( sr_Res(fd), &stat_buf );
69 // Ignore if not owned by current user or world writeable (CVE-2008-4865)
70 if (!res && stat_buf.uid == VG_(geteuid)()
71 && (!(stat_buf.mode & VKI_S_IWOTH))) {
72 if ( stat_buf.size > 0 ) {
73 f_clo = VG_(malloc)("commandline.rdv.1", stat_buf.size+1);
75 n = VG_(read)(sr_Res(fd), f_clo, stat_buf.size);
77 vg_assert(n >= 0 && n <= stat_buf.size+1);
82 VG_(message)(Vg_UserMsg,
83 "%s was not read as it is world writeable or not owned by the "
84 "current user\n", filename);
86 VG_(close)(sr_Res(fd));
92 // Add args from a string into VG_(args_for_valgrind), splitting the
93 // string at whitespace and adding each component as a separate arg.
95 static void add_args_from_string ( HChar* s )
101 // We have alternating sequences: blanks, non-blanks, blanks...
102 // copy the non-blanks sequences, and add terminating '\0'
103 while (VG_(isspace)(*cp)) cp++;
106 while ( !VG_(isspace)(*cp) && *cp != 0 ) cp++;
107 if ( *cp != 0 ) *cp++ = '\0'; // terminate if not the last
108 add_string( VG_(args_for_valgrind), tmp );
113 /* Split up the args presented by the launcher to m_main.main(), and
114 park them in VG_(args_for_client) and VG_(args_for_valgrind).
116 The resulting arg list is the concatenation of the following:
117 - contents of ~/.valgrindrc
118 - contents of $VALGRIND_OPTS
119 - contents of ./.valgrindrc
120 - args from the command line
123 VG_(args_for_valgrind_noexecpass) is set to be the number of items
124 in the first three categories. They are not passed to child invokations
125 at exec, whereas the last group is.
127 If the last group contains --command-line-only=yes, then the
128 first three groups are left empty.
130 Scheme: first examine the last group (the supplied argc/argv).
131 It should look like this.
133 args-for-v exe_name args-for-c
135 args-for-v are taken until either they don't start with '-' or
138 The exe name and args-for-c are recorded without further ado.
139 Note that args-for-c[0] is the first real arg for the client, not
142 args-for-v are then copied into tmp_xarray.
144 if args-for-v does not include --command-line-only=yes:
145 contents of ~/.valgrindrc, $VALGRIND_OPTS and ./.valgrindrc
146 are copied into VG_(args_for_valgrind).
148 VG_(args_for_valgrind) is made empty.
150 Finally, tmp_xarray is copied onto the end of VG_(args_for_valgrind).
153 void VG_(split_up_argv)( Int argc, HChar** argv )
157 static Bool already_called = False;
159 XArray* /* of HChar* */ tmp_xarray;
161 /* This function should be called once, at startup, and then never
163 vg_assert(!already_called);
164 already_called = True;
166 tmp_xarray = VG_(newXA)( VG_(malloc), "commandline.sua.1",
167 VG_(free), sizeof(HChar*) );
168 vg_assert(tmp_xarray);
170 vg_assert( ! VG_(args_for_valgrind) );
171 VG_(args_for_valgrind)
172 = VG_(newXA)( VG_(malloc), "commandline.sua.2",
173 VG_(free), sizeof(HChar*) );
174 vg_assert( VG_(args_for_valgrind) );
176 vg_assert( ! VG_(args_for_client) );
178 = VG_(newXA)( VG_(malloc), "commandline.sua.3",
179 VG_(free), sizeof(HChar*) );
180 vg_assert( VG_(args_for_client) );
182 /* Collect up the args-for-V. */
183 i = 1; /* skip the exe (stage2) name. */
184 for (; i < argc; i++) {
186 if (0 == VG_(strcmp)(argv[i], "--")) {
190 if (0 == VG_(strcmp)(argv[i], "--command-line-only=yes"))
192 if (argv[i][0] != '-')
194 add_string( tmp_xarray, argv[i] );
197 /* Should now be looking at the exe name. */
200 VG_(args_the_exename) = argv[i];
204 /* The rest are args for the client. */
205 for (; i < argc; i++) {
207 add_string( VG_(args_for_client), argv[i] );
210 /* Get extra args from ~/.valgrindrc, $VALGRIND_OPTS and
211 ./.valgrindrc into VG_(args_for_valgrind). */
213 // read_dot_valgrindrc() allocates the return value with
214 // VG_(malloc)(). We do not free f1_clo and f2_clo as they get
215 // put into VG_(args_for_valgrind) and so must persist.
216 HChar* home = VG_(getenv)("HOME");
217 HChar* f1_clo = home ? read_dot_valgrindrc( home ) : NULL;
218 HChar* env_clo = VG_(strdup)( "commandline.sua.4",
219 VG_(getenv)(VALGRIND_OPTS) );
220 HChar* f2_clo = NULL;
222 // Don't read ./.valgrindrc if "." is the same as "$HOME", else its
223 // contents will be applied twice. (bug #142488)
225 HChar cwd[VKI_PATH_MAX+1];
226 Bool cwd_ok = VG_(get_startup_wd)(cwd, VKI_PATH_MAX);
227 f2_clo = ( (cwd_ok && VG_STREQ(home, cwd))
228 ? NULL : read_dot_valgrindrc(".") );
231 if (f1_clo) add_args_from_string( f1_clo );
232 if (env_clo) add_args_from_string( env_clo );
233 if (f2_clo) add_args_from_string( f2_clo );
236 /* .. and record how many extras we got. */
237 VG_(args_for_valgrind_noexecpass)
238 = VG_(sizeXA)( VG_(args_for_valgrind) );
240 /* Finally, copy tmp_xarray onto the end. */
241 for (i = 0; i < VG_(sizeXA)( tmp_xarray ); i++)
242 add_string( VG_(args_for_valgrind),
243 * (HChar**)VG_(indexXA)( tmp_xarray, i ) );
245 VG_(deleteXA)( tmp_xarray );
248 /*--------------------------------------------------------------------*/
250 /*--------------------------------------------------------------------*/