Add pldd program
This commit is contained in:
Ulrich Drepper
parent
8621fc3b99
commit
11988f8f96
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@ -1,3 +1,9 @@
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2011-06-09 Ulrich Drepper <drepper@gmail.com>
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* elf/Makefile: Add rules to build pldd.
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* elf/pldd.c: New file.
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* elf/pldd-xx.c: New file.
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2011-06-07 Ulrich Drepper <drepper@gmail.com>
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* version.h: Update for 2.15 development version.
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5
NEWS
5
NEWS
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@ -1,4 +1,4 @@
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GNU C Library NEWS -- history of user-visible changes. 2011-6-7
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GNU C Library NEWS -- history of user-visible changes. 2011-6-9
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Copyright (C) 1992-2009, 2010, 2011 Free Software Foundation, Inc.
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See the end for copying conditions.
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@ -6,6 +6,9 @@ Please send GNU C library bug reports via <http://sources.redhat.com/bugzilla/>
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using `glibc' in the "product" field.
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Version 2.15
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* New program pldd to list loaded object of a process
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Implemented by Ulrich Drepper.
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Version 2.14
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@ -150,8 +150,8 @@ install-others = $(inst_slibdir)/$(rtld-installed-name)
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install-bin-script = ldd
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endif
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others = sprof sln
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install-bin = sprof
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others = sprof sln pldd
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install-bin = sprof pldd
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others-static = sln
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install-rootsbin = sln
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@ -164,6 +164,8 @@ install-rootsbin += ldconfig
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ldconfig-modules := cache readlib xmalloc xstrdup chroot_canon
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extra-objs += $(ldconfig-modules:=.o)
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pldd-modules := xmalloc
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# To find xmalloc.c and xstrdup.c
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vpath %.c ../locale/programs
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@ -494,6 +496,9 @@ $(objpfx)ldd: ldd.bash.in $(common-objpfx)soversions.mk \
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$(objpfx)sprof: $(libdl)
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$(objpfx)ldconfig: $(ldconfig-modules:%=$(objpfx)%.o)
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$(objpfx)pldd: $(pldd-modules:%=$(objpfx)%.o)
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SYSCONF-FLAGS := -D'SYSCONFDIR="$(sysconfdir)"'
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CFLAGS-ldconfig.c = $(SYSCONF-FLAGS) -D'LIBDIR="$(libdir)"' \
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-D'SLIBDIR="$(slibdir)"' -DIS_IN_ldconfig=1
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@ -0,0 +1,238 @@
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/* Copyright (C) 2011 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@gmail.com>, 2011.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#define E(name) E_(name, CLASS)
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#define E_(name, cl) E__(name, cl)
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#define E__(name, cl) name##cl
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#define EW(type) EW_(Elf, CLASS, type)
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#define EW_(e, w, t) EW__(e, w, _##t)
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#define EW__(e, w, t) e##w##t
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#define static_assert(name, exp) \
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typedef int __assert_##name[((exp) != 0) - 1]
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struct E(link_map)
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{
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EW(Addr) l_addr;
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EW(Addr) l_name;
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EW(Addr) l_ld;
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EW(Addr) l_next;
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EW(Addr) l_prev;
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EW(Addr) l_real;
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Lmid_t l_ns;
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EW(Addr) l_libname;
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};
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#if CLASS == __ELF_NATIVE_CLASS
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static_assert (l_addr, (offsetof (struct link_map, l_addr)
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== offsetof (struct E(link_map), l_addr)));
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static_assert (l_name, (offsetof (struct link_map, l_name)
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== offsetof (struct E(link_map), l_name)));
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static_assert (l_next, (offsetof (struct link_map, l_next)
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== offsetof (struct E(link_map), l_next)));
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#endif
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struct E(libname_list)
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{
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EW(Addr) name;
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EW(Addr) next;
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};
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#if CLASS == __ELF_NATIVE_CLASS
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static_assert (name, (offsetof (struct libname_list, name)
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== offsetof (struct E(libname_list), name)));
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static_assert (next, (offsetof (struct libname_list, next)
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== offsetof (struct E(libname_list), next)));
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#endif
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struct E(r_debug)
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{
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int r_version;
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EW(Addr) r_map;
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};
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#if CLASS == __ELF_NATIVE_CLASS
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static_assert (r_version, (offsetof (struct r_debug, r_version)
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== offsetof (struct E(r_debug), r_version)));
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static_assert (r_map, (offsetof (struct r_debug, r_map)
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== offsetof (struct E(r_debug), r_map)));
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#endif
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static int
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E(find_maps) (pid_t pid, EW(Ehdr) *ehdr, void *auxv, size_t auxv_size)
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{
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EW(Addr) phdr = 0;
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unsigned int phnum = 0;
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unsigned int phent = 0;
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EW(auxv_t) *auxvXX = (EW(auxv_t) *) auxv;
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for (int i = 0; i < auxv_size / sizeof (EW(auxv_t)); ++i)
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switch (auxvXX[i].a_type)
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{
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case AT_PHDR:
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phdr = auxvXX[i].a_un.a_val;
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break;
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case AT_PHNUM:
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phnum = auxvXX[i].a_un.a_val;
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break;
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case AT_PHENT:
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phent = auxvXX[i].a_un.a_val;
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break;
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default:
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break;
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}
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if (phdr == 0 || phnum == 0 || phent == 0)
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error (EXIT_FAILURE, 0, gettext ("cannot find program header of process"));
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EW(Phdr) *p = alloca (phnum * phent);
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if (pread64 (memfd, p, phnum * phent, phdr) != phnum * phent)
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{
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error (0, 0, gettext ("cannot read program header"));
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return EXIT_FAILURE;
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}
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/* Determine the load offset. We need this for interpreting the
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other program header entries so we do this in a separate loop.
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Fortunately it is the first time unless someone does something
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stupid when linking the application. */
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EW(Addr) offset = 0;
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for (unsigned int i = 0; i < phnum; ++i)
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if (p[i].p_type == PT_PHDR)
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{
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offset = phdr - p[i].p_vaddr;
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break;
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}
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EW(Addr) list = 0;
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char *interp = NULL;
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for (unsigned int i = 0; i < phnum; ++i)
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if (p[i].p_type == PT_DYNAMIC)
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{
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EW(Dyn) *dyn = xmalloc (p[i].p_filesz);
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if (pread64 (memfd, dyn, p[i].p_filesz, offset + p[i].p_vaddr)
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!= p[i].p_filesz)
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{
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error (0, 0, gettext ("cannot read dynamic section"));
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return EXIT_FAILURE;
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}
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/* Search for the DT_DEBUG entry. */
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for (unsigned int j = 0; j < p[i].p_filesz / sizeof (EW(Dyn)); ++j)
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if (dyn[j].d_tag == DT_DEBUG && dyn[j].d_un.d_ptr != 0)
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{
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struct E(r_debug) r;
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if (pread64 (memfd, &r, sizeof (r), dyn[j].d_un.d_ptr)
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!= sizeof (r))
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{
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error (0, 0, gettext ("cannot read r_debug"));
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return EXIT_FAILURE;
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}
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if (r.r_map != 0)
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{
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list = r.r_map;
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break;
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}
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}
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free (dyn);
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break;
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}
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else if (p[i].p_type == PT_INTERP)
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{
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interp = alloca (p[i].p_filesz);
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if (pread64 (memfd, interp, p[i].p_filesz, offset + p[i].p_vaddr)
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!= p[i].p_filesz)
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{
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error (0, 0, gettext ("cannot read program interpreter"));
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return EXIT_FAILURE;
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}
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}
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if (list == 0)
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{
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if (interp == NULL)
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{
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// XXX check whether the executable itself is the loader
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return EXIT_FAILURE;
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}
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// XXX perhaps try finding ld.so and _r_debug in it
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return EXIT_FAILURE;
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}
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/* Print the PID and program name first. */
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printf ("%lu:\t%s\n", (unsigned long int) pid, exe);
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/* Iterate over the list of objects and print the information. */
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size_t strsize = 256;
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char *str = alloca (strsize);
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do
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{
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struct E(link_map) m;
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if (pread64 (memfd, &m, sizeof (m), list) != sizeof (m))
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{
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error (0, 0, gettext ("cannot read link map"));
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return EXIT_FAILURE;
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}
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EW(Addr) name_offset = m.l_name;
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again:
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while (1)
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{
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ssize_t n = pread64 (memfd, str, strsize, name_offset);
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if (n == -1)
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{
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error (0, 0, gettext ("cannot read object name"));
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return EXIT_FAILURE;
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}
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if (memchr (str, '\0', n) != NULL)
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break;
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str = extend_alloca (str, strsize, strsize * 2);
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}
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if (str[0] == '\0' && name_offset == m.l_name
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&& m.l_libname != 0)
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{
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/* Try the l_libname element. */
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struct E(libname_list) ln;
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if (pread64 (memfd, &ln, sizeof (ln), m.l_libname) == sizeof (ln))
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{
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name_offset = ln.name;
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goto again;
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}
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}
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/* Skip over the executable. */
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if (str[0] != '\0')
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printf ("%s\n", str);
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list = m.l_next;
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}
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while (list != 0);
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return 0;
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}
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#undef CLASS
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@ -0,0 +1,234 @@
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/* List dynamic shared objects linked into given process.
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Copyright (C) 2011 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@gmail.com>, 2011.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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|
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <alloca.h>
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#include <argp.h>
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#include <elf.h>
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#include <errno.h>
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#include <error.h>
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#include <fcntl.h>
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#include <libintl.h>
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#include <link.h>
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#include <stddef.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 <unistd.h>
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#include <sys/ptrace.h>
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#include <sys/stat.h>
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#include <ldsodefs.h>
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#include <version.h>
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/* Global variables. */
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extern char *program_invocation_short_name;
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#define PACKAGE _libc_intl_domainname
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/* External functions. */
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extern void *xmalloc (size_t n);
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extern void *xrealloc (void *p, size_t n);
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/* Name and version of program. */
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static void print_version (FILE *stream, struct argp_state *state);
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void (*argp_program_version_hook) (FILE *, struct argp_state *) = print_version;
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/* Bug report address. */
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const char *argp_program_bug_address = N_("\
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For bug reporting instructions, please see:\n\
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<http://www.gnu.org/software/libc/bugs.html>.\n");
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/* Definitions of arguments for argp functions. */
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static const struct argp_option options[] =
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{
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{ NULL, 0, NULL, 0, NULL }
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};
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/* Short description of program. */
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static const char doc[] = N_("\
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List dynamic shared objects loaded into process.");
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/* Strings for arguments in help texts. */
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static const char args_doc[] = N_("PID");
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|
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/* Prototype for option handler. */
|
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static error_t parse_opt (int key, char *arg, struct argp_state *state);
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|
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/* Data structure to communicate with argp functions. */
|
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static struct argp argp =
|
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{
|
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options, parse_opt, args_doc, doc, NULL, NULL, NULL
|
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};
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|
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// File descriptor of /proc/*/mem file.
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static int memfd;
|
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|
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/* Name of the executable */
|
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static char *exe;
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|
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/* Local functions. */
|
||||
static int get_process_info (pid_t pid);
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||||
|
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|
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int
|
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main (int argc, char *argv[])
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||||
{
|
||||
/* Parse and process arguments. */
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||||
int remaining;
|
||||
argp_parse (&argp, argc, argv, 0, &remaining, NULL);
|
||||
|
||||
if (remaining != argc - 1)
|
||||
{
|
||||
fprintf (stderr,
|
||||
gettext ("Exactly one parameter with process ID required.\n"));
|
||||
argp_help (&argp, stderr, ARGP_HELP_SEE, program_invocation_short_name);
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||||
return 1;
|
||||
}
|
||||
|
||||
char *endp;
|
||||
errno = 0;
|
||||
pid_t pid = strtoul (argv[remaining], &endp, 10);
|
||||
if ((pid == ULONG_MAX && errno == ERANGE) || *endp != '\0')
|
||||
error (EXIT_FAILURE, 0, gettext ("invalid process ID '%s'"),
|
||||
argv[remaining]);
|
||||
|
||||
/* Determine the program name. */
|
||||
char buf[11 + 3 * sizeof (pid)];
|
||||
snprintf (buf, sizeof (buf), "/proc/%lu/exe", (unsigned long int) pid);
|
||||
size_t exesize = 1024;
|
||||
exe = alloca (exesize);
|
||||
ssize_t nexe;
|
||||
while ((nexe = readlink (buf, exe, exesize)) == exesize)
|
||||
extend_alloca (exe, exesize, 2 * exesize);
|
||||
if (nexe == -1)
|
||||
exe = (char *) "<program name undetermined>";
|
||||
else
|
||||
exe[nexe] = '\0';
|
||||
|
||||
if (ptrace (PTRACE_ATTACH, pid, NULL, NULL) != 0)
|
||||
error (EXIT_FAILURE, errno, gettext ("cannot attach to process %lu"),
|
||||
(unsigned long int) pid);
|
||||
|
||||
int status = get_process_info (pid);
|
||||
|
||||
ptrace (PTRACE_DETACH, pid, NULL, NULL);
|
||||
|
||||
return status;
|
||||
}
|
||||
|
||||
|
||||
/* Handle program arguments. */
|
||||
static error_t
|
||||
parse_opt (int key, char *arg, struct argp_state *state)
|
||||
{
|
||||
switch (key)
|
||||
{
|
||||
default:
|
||||
return ARGP_ERR_UNKNOWN;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
/* Print the version information. */
|
||||
static void
|
||||
print_version (FILE *stream, struct argp_state *state)
|
||||
{
|
||||
fprintf (stream, "pldd (GNU %s) %s\n", PACKAGE, VERSION);
|
||||
fprintf (stream, gettext ("\
|
||||
Copyright (C) %s Free Software Foundation, Inc.\n\
|
||||
This is free software; see the source for copying conditions. There is NO\n\
|
||||
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\
|
||||
"), "2011");
|
||||
fprintf (stream, gettext ("Written by %s.\n"), "Ulrich Drepper");
|
||||
}
|
||||
|
||||
|
||||
#define CLASS 32
|
||||
#include "pldd-xx.c"
|
||||
#define CLASS 64
|
||||
#include "pldd-xx.c"
|
||||
|
||||
|
||||
static int
|
||||
get_process_info (pid_t pid)
|
||||
{
|
||||
char buf[12 + 3 * sizeof (pid)];
|
||||
|
||||
snprintf (buf, sizeof (buf), "/proc/%lu/mem", (unsigned long int) pid);
|
||||
memfd = open (buf, O_RDONLY);
|
||||
if (memfd == -1)
|
||||
goto no_info;
|
||||
|
||||
snprintf (buf, sizeof (buf), "/proc/%lu/exe", (unsigned long int) pid);
|
||||
int fd = open (buf, O_RDONLY);
|
||||
if (fd == -1)
|
||||
{
|
||||
no_info:
|
||||
error (0, errno, gettext ("cannot get information about process %lu"),
|
||||
(unsigned long int) pid);
|
||||
return EXIT_FAILURE;
|
||||
}
|
||||
|
||||
union
|
||||
{
|
||||
Elf32_Ehdr ehdr32;
|
||||
Elf64_Ehdr ehdr64;
|
||||
} uehdr;
|
||||
if (read (fd, &uehdr, sizeof (uehdr)) != sizeof (uehdr))
|
||||
goto no_info;
|
||||
|
||||
close (fd);
|
||||
|
||||
if (memcmp (uehdr.ehdr32.e_ident, ELFMAG, SELFMAG) != 0)
|
||||
{
|
||||
error (0, 0, gettext ("process %lu is no ELF program"),
|
||||
(unsigned long int) pid);
|
||||
return EXIT_FAILURE;
|
||||
}
|
||||
|
||||
snprintf (buf, sizeof (buf), "/proc/%lu/auxv", (unsigned long int) pid);
|
||||
fd = open (buf, O_RDONLY);
|
||||
if (fd == -1)
|
||||
goto no_info;
|
||||
|
||||
size_t auxv_size = 0;
|
||||
void *auxv = NULL;
|
||||
while (1)
|
||||
{
|
||||
auxv_size += 512;
|
||||
auxv = xrealloc (auxv, auxv_size);
|
||||
|
||||
ssize_t n = read (fd, auxv, auxv_size);
|
||||
if (n < 0)
|
||||
goto no_info;
|
||||
if (n < auxv_size)
|
||||
{
|
||||
auxv_size = n;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
close (fd);
|
||||
|
||||
if (uehdr.ehdr32.e_ident[EI_CLASS] == ELFCLASS32)
|
||||
return find_maps32 (pid, &uehdr.ehdr32, auxv, auxv_size);
|
||||
else
|
||||
return find_maps64 (pid, &uehdr.ehdr64, auxv, auxv_size);
|
||||
}
|
||||
Loading…
Reference in New Issue