1ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 2ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*--------------------------------------------------------------------*/ 3ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*--- Startup: search PATH for an executable initimg-pathscan.c ---*/ 4ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*--------------------------------------------------------------------*/ 5ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 6ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/* 7ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown This file is part of Valgrind, a dynamic binary instrumentation 8ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown framework. 9ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 10436e89c602e787e7a27dd6624b09beed41a0da8aDmitriy Ivanov Copyright (C) 2000-2013 Julian Seward 11ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown jseward@acm.org 12ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 13ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown This program is free software; you can redistribute it and/or 14ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown modify it under the terms of the GNU General Public License as 15ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown published by the Free Software Foundation; either version 2 of the 16ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown License, or (at your option) any later version. 17ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 18ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown This program is distributed in the hope that it will be useful, but 19ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown WITHOUT ANY WARRANTY; without even the implied warranty of 20ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 21ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown General Public License for more details. 22ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 23ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown You should have received a copy of the GNU General Public License 24ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown along with this program; if not, write to the Free Software 25ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 26ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 02111-1307, USA. 27ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 28ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown The GNU General Public License is contained in the file COPYING. 29ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown*/ 30ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 31ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_basics.h" 32ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_vki.h" 33ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_debuglog.h" 34ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_libcbase.h" 35ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_libcassert.h" 36ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_libcfile.h" 37ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_libcproc.h" 38ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_libcprint.h" 39ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_xarray.h" 40ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_clientstate.h" 41ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_aspacemgr.h" 42ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_mallocfree.h" 43ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_machine.h" 44ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_ume.h" 45ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_options.h" 46ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_tooliface.h" /* VG_TRACK */ 47ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_initimg.h" /* self */ 48ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 49ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "priv_initimg_pathscan.h" 50ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 51ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 52ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*====================================================================*/ 53ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*=== Find executable ===*/ 54ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*====================================================================*/ 55ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 56ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/* Scan a colon-separated list, and call a function on each element. 57ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown The string must be mutable, because we insert a temporary '\0', but 58ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown the string will end up unmodified. (*func) should return True if it 59ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown doesn't need to see any more. 60ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 61ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown This routine will return True if (*func) returns True and False if 62ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown it reaches the end of the list without that happening. 63ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown*/ 64436e89c602e787e7a27dd6624b09beed41a0da8aDmitriy Ivanovstatic Bool scan_colsep(HChar *colsep, Bool (*func)(const HChar *)) 65ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 66436e89c602e787e7a27dd6624b09beed41a0da8aDmitriy Ivanov HChar *cp, *entry; 67ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown int end; 68ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 69ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (colsep == NULL || 70ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown *colsep == '\0') 71ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return False; 72ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 73ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown entry = cp = colsep; 74ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 75ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown do { 76ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown end = (*cp == '\0'); 77ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 78ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (*cp == ':' || *cp == '\0') { 79436e89c602e787e7a27dd6624b09beed41a0da8aDmitriy Ivanov HChar save = *cp; 80ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 81ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown *cp = '\0'; 82ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if ((*func)(entry)) { 83ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown *cp = save; 84ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return True; 85ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 86ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown *cp = save; 87ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown entry = cp+1; 88ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 89ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown cp++; 90ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } while(!end); 91ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 92ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return False; 93ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 94ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 95ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/* Need a static copy because can't use dynamic mem allocation yet */ 96ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownstatic HChar executable_name_in [VKI_PATH_MAX]; 97ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownstatic HChar executable_name_out[VKI_PATH_MAX]; 98ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 99436e89c602e787e7a27dd6624b09beed41a0da8aDmitriy Ivanovstatic Bool match_executable(const HChar *entry) 100ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 101ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown HChar buf[VG_(strlen)(entry) + VG_(strlen)(executable_name_in) + 3]; 102ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 103ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* empty PATH element means '.' */ 104ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (*entry == '\0') 105ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown entry = "."; 106ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 107ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(snprintf)(buf, sizeof(buf), "%s/%s", entry, executable_name_in); 108ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 109ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // Don't match directories 110ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (VG_(is_dir)(buf)) 111ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return False; 112ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 113ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // If we match an executable, we choose that immediately. If we find a 114ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // matching non-executable we remember it but keep looking for an 115ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // matching executable later in the path. 116ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (VG_(access)(buf, True/*r*/, False/*w*/, True/*x*/) == 0) { 117ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(strncpy)( executable_name_out, buf, VKI_PATH_MAX-1 ); 118ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown executable_name_out[VKI_PATH_MAX-1] = 0; 119ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return True; // Stop looking 120ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } else if (VG_(access)(buf, True/*r*/, False/*w*/, False/*x*/) == 0 121ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown && VG_STREQ(executable_name_out, "")) 122ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown { 123ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(strncpy)( executable_name_out, buf, VKI_PATH_MAX-1 ); 124ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown executable_name_out[VKI_PATH_MAX-1] = 0; 125ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return False; // Keep looking 126ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } else { 127ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return False; // Keep looking 128ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 129ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 130ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 131ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown// Returns NULL if it wasn't found. 132436e89c602e787e7a27dd6624b09beed41a0da8aDmitriy Ivanovconst HChar* ML_(find_executable) ( const HChar* exec ) 133ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 134ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown vg_assert(NULL != exec); 135ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (VG_(strchr)(exec, '/')) { 136ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // Has a '/' - use the name as is 137ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(strncpy)( executable_name_out, exec, VKI_PATH_MAX-1 ); 138ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } else { 139ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // No '/' - we need to search the path 140ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown HChar* path; 141ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(strncpy)( executable_name_in, exec, VKI_PATH_MAX-1 ); 142ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(memset) ( executable_name_out, 0, VKI_PATH_MAX ); 143ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown path = VG_(getenv)("PATH"); 144ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown scan_colsep(path, match_executable); 145ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 146ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return VG_STREQ(executable_name_out, "") ? NULL : executable_name_out; 147ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 148ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 149ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*--------------------------------------------------------------------*/ 150ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*--- end ---*/ 151ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*--------------------------------------------------------------------*/ 152