158 lines
3.7 KiB
C
158 lines
3.7 KiB
C
/*-
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* Copyright (c) 2006 Joseph Koshy
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/errno.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <ar.h>
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#include <ctype.h>
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#include <libelf.h>
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#include <unistd.h>
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#include "_libelf.h"
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static Elf *
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_libelf_open_object(int fd, Elf_Cmd c)
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{
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Elf *e;
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void *m;
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struct stat sb;
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/*
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* 'Raw' files are always mapped with 'PROT_READ'. At
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* elf_update(3) time for files opened with ELF_C_RDWR the
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* mapping is unmapped, file data is written to using write(2)
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* and then the raw data is immediately mapped back in.
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*/
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if (fstat(fd, &sb) < 0) {
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LIBELF_SET_ERROR(IO, errno);
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return (NULL);
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}
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m = NULL;
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if ((m = mmap(NULL, (size_t) sb.st_size, PROT_READ, MAP_PRIVATE, fd,
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(off_t) 0)) == MAP_FAILED) {
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LIBELF_SET_ERROR(IO, errno);
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return (NULL);
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}
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if ((e = elf_memory(m, (size_t) sb.st_size)) == NULL) {
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(void) munmap(m, (size_t) sb.st_size);
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return (NULL);
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}
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e->e_flags |= LIBELF_F_MMAP;
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e->e_fd = fd;
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e->e_cmd = c;
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if (c == ELF_C_RDWR && e->e_kind == ELF_K_AR) {
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(void) elf_end(e);
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LIBELF_SET_ERROR(ARGUMENT, 0);
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return (NULL);
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}
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return (e);
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}
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Elf *
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elf_begin(int fd, Elf_Cmd c, Elf *a)
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{
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Elf *e;
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e = NULL;
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if (LIBELF_PRIVATE(version) == EV_NONE) {
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LIBELF_SET_ERROR(SEQUENCE, 0);
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return (NULL);
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}
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switch (c) {
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case ELF_C_NULL:
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return (NULL);
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case ELF_C_WRITE:
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if (a != NULL) { /* not allowed for ar(1) archives. */
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LIBELF_SET_ERROR(ARGUMENT, 0);
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return (NULL);
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}
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/*
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* Check writeability of `fd' immediately and fail if
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* not writeable.
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*/
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if (ftruncate(fd, (off_t) 0) < 0) {
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LIBELF_SET_ERROR(IO, errno);
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return (NULL);
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}
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if ((e = _libelf_allocate_elf()) != NULL) {
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_libelf_init_elf(e, ELF_K_ELF);
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e->e_byteorder = LIBELF_PRIVATE(byteorder);
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e->e_fd = fd;
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e->e_cmd = c;
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}
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return (e);
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case ELF_C_RDWR:
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if (a != NULL) { /* not allowed for ar(1) archives. */
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LIBELF_SET_ERROR(ARGUMENT, 0);
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return (NULL);
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}
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/*FALLTHROUGH*/
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case ELF_C_READ:
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/*
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* Descriptor `a' could be for a regular ELF file, or
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* for an ar(1) archive.
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*/
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if (a && (a->e_fd != fd || c != a->e_cmd)) {
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LIBELF_SET_ERROR(ARGUMENT, 0);
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return (NULL);
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}
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break;
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default:
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LIBELF_SET_ERROR(ARGUMENT, 0);
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return (NULL);
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}
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if (a == NULL)
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e = _libelf_open_object(fd, c);
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else if (a->e_kind == ELF_K_AR)
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e = _libelf_ar_open_member(fd, c, a);
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else
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(e = a)->e_activations++;
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return (e);
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}
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