+/*
+ * Copyright (c) 2016 Martin Pieuchot <mpi@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/exec_elf.h>
+#include <sys/mman.h>
+
+#include <err.h>
+#include <fcntl.h>
+#include <locale.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#ifdef ZLIB
+#include <zlib.h>
+#endif /* ZLIB */
+
+#include "ctf.h"
+
+#define SUNW_CTF ".SUNW_ctf"
+
+#define DUMP_OBJECT (1 << 0)
+#define DUMP_FUNCTION (1 << 1)
+#define DUMP_HEADER (1 << 2)
+
+int dump(const char *, uint32_t);
+int iself(const char *, size_t);
+int isctf(const char *, size_t);
+__dead void usage(void);
+
+int ctf_dump(const char *, size_t, uint32_t);
+const char *ctf_off2name(struct ctf_header *, const char *, off_t,
+ unsigned int);
+
+int elf_dump(const char *, size_t, uint32_t);
+int elf_getshstrtab(const char *, size_t, const char **, size_t *);
+int elf_getsymtab(const char *, const char *, size_t,
+ const Elf_Sym **, size_t *);
+int elf_getstrtab(const char *, const char *, size_t,
+ const char **, size_t *);
+
+#ifdef ZLIB
+char *decompress(const char *, size_t, off_t);
+#endif /* ZLIB */
+
+int
+main(int argc, char *argv[])
+{
+ const char *filename;
+ uint32_t flags = 0;
+ int ch, error = 0;
+
+ setlocale(LC_ALL, "");
+
+ while ((ch = getopt(argc, argv, "dfhlsSt")) != -1) {
+ switch (ch) {
+ case 'h':
+ flags |= DUMP_HEADER;
+ break;
+ default:
+ usage();
+ }
+ }
+
+ argc -= optind;
+ argv += optind;
+
+ while ((filename = *argv++) != NULL)
+ error |= dump(filename, flags);
+
+ return error;
+}
+
+int
+dump(const char *path, uint32_t flags)
+{
+ struct stat st;
+ int fd, error = 1;
+ char *p;
+
+ fd = open(path, O_RDONLY);
+ if (fd == -1) {
+ warn("open");
+ return 1;
+ }
+ if (fstat(fd, &st) == -1) {
+ warn("fstat");
+ return 1;
+ }
+ if (st.st_size < (off_t)sizeof(struct ctf_header)) {
+ warnx("file too small to be CTF");
+ return 1;
+ }
+ if ((uintmax_t)st.st_size > SIZE_MAX) {
+ warnx("file too big to fit memory");
+ return 1;
+ }
+
+ p = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
+ if (p == MAP_FAILED)
+ err(1, "mmap");
+
+ if (iself(p, st.st_size)) {
+ error = elf_dump(p, st.st_size, flags);
+ } else if (isctf(p, st.st_size)) {
+ error = ctf_dump(p, st.st_size, flags);
+ }
+
+ munmap(p, st.st_size);
+ close(fd);
+
+ return error;
+}
+
+int
+iself(const char *p, size_t filesize)
+{
+ Elf_Ehdr *eh = (Elf_Ehdr *)p;
+
+ if (eh->e_ehsize < sizeof(Elf_Ehdr) || !IS_ELF(*eh)) {
+ warnx("file is not ELF");
+ return 0;
+ }
+ if (eh->e_ident[EI_CLASS] != ELFCLASS) {
+ warnx("unexpected word size %u", eh->e_ident[EI_CLASS]);
+ return 0;
+ }
+ if (eh->e_ident[EI_VERSION] != ELF_TARG_VER) {
+ warnx("unexpected version %u", eh->e_ident[EI_VERSION]);
+ return 0;
+ }
+ if (eh->e_ident[EI_DATA] >= ELFDATANUM) {
+ warnx("unexpected data format %u", eh->e_ident[EI_DATA]);
+ return 0;
+ }
+ if (eh->e_shoff > filesize) {
+ warnx("bogus section table offset 0x%llx", eh->e_shoff);
+ return 0;
+ }
+ if (eh->e_shentsize < sizeof(Elf_Shdr)) {
+ warnx("bogus section header size %u", eh->e_shentsize);
+ return 0;
+ }
+ if (eh->e_shnum > (filesize - eh->e_shoff) / eh->e_shentsize) {
+ warnx("bogus section header count %u", eh->e_shnum);
+ return 0;
+ }
+ if (eh->e_shstrndx >= eh->e_shnum) {
+ warnx("bogus string table index %u", eh->e_shstrndx);
+ return 0;
+ }
+
+ return 1;
+}
+
+int
+elf_getshstrtab(const char *p, size_t filesize, const char **shstrtab,
+ size_t *shstrtabsize)
+{
+ Elf_Ehdr *eh = (Elf_Ehdr *)p;
+ Elf_Shdr *sh;
+
+ sh = (Elf_Shdr *)(p + eh->e_shoff + eh->e_shstrndx * eh->e_shentsize);
+ if (sh->sh_type != SHT_STRTAB) {
+ warnx("unexpected string table type");
+ return 1;
+ }
+ if (sh->sh_offset > filesize) {
+ warnx("bogus string table offset");
+ return 1;
+ }
+ if (sh->sh_size > filesize - sh->sh_offset) {
+ warnx("bogus string table size");
+ return 1;
+ }
+ if (shstrtab != NULL)
+ *shstrtab = p + sh->sh_offset;
+ if (shstrtabsize != NULL)
+ *shstrtabsize = sh->sh_size;
+
+ return 0;
+}
+
+int
+elf_getsymtab(const char *p, const char *shstrtab, size_t shstrtabsize,
+ const Elf_Sym **symtab, size_t *nsymb)
+{
+ Elf_Ehdr *eh = (Elf_Ehdr *)p;
+ Elf_Shdr *sh;
+ size_t i;
+
+ for (i = 0; i < eh->e_shnum; i++) {
+ sh = (Elf_Shdr *)(p + eh->e_shoff + i * eh->e_shentsize);
+
+ if (sh->sh_type != SHT_SYMTAB)
+ continue;
+
+ if ((sh->sh_link >= eh->e_shnum) ||
+ (sh->sh_name >= shstrtabsize))
+ continue;
+
+ if (strncmp(shstrtab + sh->sh_name, ELF_SYMTAB,
+ strlen(ELF_SYMTAB)) == 0) {
+ if (symtab != NULL)
+ *symtab = (Elf_Sym *)(p + sh->sh_offset);
+ if (nsymb != NULL)
+ *nsymb = (sh->sh_size / sh->sh_entsize);
+
+ return 0;
+ }
+ }
+
+ return 1;
+}
+
+int
+elf_getstrtab(const char *p, const char *shstrtab, size_t shstrtabsize,
+ const char **strtab, size_t *strtabsize)
+{
+ Elf_Ehdr *eh = (Elf_Ehdr *)p;
+ Elf_Shdr *sh;
+ size_t i;
+
+ for (i = 0; i < eh->e_shnum; i++) {
+ sh = (Elf_Shdr *)(p + eh->e_shoff + i * eh->e_shentsize);
+
+ if (sh->sh_type != SHT_STRTAB)
+ continue;
+
+ if ((sh->sh_link >= eh->e_shnum) ||
+ (sh->sh_name >= shstrtabsize))
+ continue;
+
+ if (strncmp(shstrtab + sh->sh_name, ELF_STRTAB,
+ strlen(ELF_STRTAB)) == 0) {
+ if (strtab != NULL)
+ *strtab = p + sh->sh_offset;
+ if (strtabsize != NULL)
+ *strtabsize = sh->sh_size;
+
+ return 0;
+ }
+ }
+
+ return 1;
+}
+
+const char *strtab;
+const Elf_Sym *symtab;
+size_t strtabsize, nsymb;
+
+int
+elf_dump(const char *p, size_t filesize, uint32_t flags)
+{
+ Elf_Ehdr *eh = (Elf_Ehdr *)p;
+ Elf_Shdr *sh;
+ const char *shstrtab;
+ size_t i, shstrtabsize;
+
+ /* Find section header string table location and size. */
+ if (elf_getshstrtab(p, filesize, &shstrtab, &shstrtabsize))
+ return 1;
+
+ /* Find symbol table location and number of symbols. */
+ if (elf_getsymtab(p, shstrtab, shstrtabsize, &symtab, &nsymb))
+ warnx("symbol table not found");
+
+ /* Find string table location and size. */
+ if (elf_getstrtab(p, shstrtab, shstrtabsize, &strtab, &strtabsize))
+ warnx("string table not found");
+
+ /* Find CTF section and dump it. */
+ for (i = 0; i < eh->e_shnum; i++) {
+ sh = (Elf_Shdr *)(p + eh->e_shoff + i * eh->e_shentsize);
+
+ if ((sh->sh_link >= eh->e_shnum) ||
+ (sh->sh_name >= shstrtabsize))
+ continue;
+
+ if (strncmp(shstrtab + sh->sh_name, SUNW_CTF, strlen(SUNW_CTF)))
+ continue;
+
+ if (!isctf(p + sh->sh_offset, sh->sh_size))
+ break;
+
+ return ctf_dump(p + sh->sh_offset, sh->sh_size, flags);
+ }
+
+ warnx("%s section not found", SUNW_CTF);
+ return 1;
+}
+
+int
+isctf(const char *p, size_t filesize)
+{
+ struct ctf_header *cth = (struct ctf_header *)p;
+ off_t dlen = cth->cth_stroff + cth->cth_strlen;
+
+ if (cth->cth_magic != CTF_MAGIC || cth->cth_version != CTF_VERSION)
+ return 0;
+
+ if (dlen > filesize && !(cth->cth_flags & CTF_F_COMPRESS)) {
+ warnx("bogus file size");
+ return 0;
+ }
+
+ if ((cth->cth_lbloff & 3) || (cth->cth_objtoff & 1) ||
+ (cth->cth_funcoff & 1) || (cth->cth_typeoff & 3)) {
+ warnx("wrongly aligned offset");
+ return 0;
+ }
+
+ if ((cth->cth_lbloff >= dlen) || (cth->cth_objtoff >= dlen) ||
+ (cth->cth_funcoff >= dlen) || (cth->cth_typeoff >= dlen)) {
+ warnx("truncated file");
+ return 0;
+ }
+
+ if ((cth->cth_lbloff > cth->cth_objtoff) ||
+ (cth->cth_objtoff > cth->cth_funcoff) ||
+ (cth->cth_funcoff > cth->cth_typeoff) ||
+ (cth->cth_typeoff > cth->cth_stroff)) {
+ warnx("corrupted file");
+ return 0;
+ }
+
+ return 1;
+}
+
+int
+ctf_dump(const char *p, size_t size, uint32_t flags)
+{
+ struct ctf_header *cth = (struct ctf_header *)p;
+ char *data = (char *)p;
+ off_t dlen = cth->cth_stroff + cth->cth_strlen;
+
+ if (cth->cth_flags & CTF_F_COMPRESS) {
+ data = decompress(p + sizeof(*cth), size - sizeof(*cth), dlen);
+ if (data == NULL)
+ return 1;
+ }
+
+ if (flags & DUMP_HEADER) {
+ printf("cth_magic = 0x%04x\n", cth->cth_magic);
+ printf("cth_version = %d\n", cth->cth_version);
+ printf("cth_flags = 0x%02x\n", cth->cth_flags);
+ printf("cth_parlabel = %s\n",
+ ctf_off2name(cth, data, dlen, cth->cth_parname));
+ printf("cth_parname = %s\n",
+ ctf_off2name(cth, data, dlen, cth->cth_parname));
+ printf("cth_lbloff = %d\n", cth->cth_lbloff);
+ printf("cth_objtoff = %d\n", cth->cth_objtoff);
+ printf("cth_funcoff = %d\n", cth->cth_funcoff);
+ printf("cth_typeoff = %d\n", cth->cth_typeoff);
+ printf("cth_stroff = %d\n", cth->cth_stroff);
+ printf("cth_strlen = %d\n", cth->cth_strlen);
+ }
+
+ if (cth->cth_flags & CTF_F_COMPRESS)
+ free(data);
+
+ return 0;
+}
+
+const char *
+ctf_off2name(struct ctf_header *cth, const char *data, off_t dlen,
+ unsigned int offset)
+{
+ const char *name;
+
+ if (CTF_NAME_STID(offset) != CTF_STRTAB_0)
+ return "external";
+
+ if (CTF_NAME_OFFSET(offset) >= cth->cth_strlen)
+ return "exceeds strlab";
+
+ if (cth->cth_stroff + CTF_NAME_OFFSET(offset) >= dlen)
+ return "invalid";
+
+ name = data + cth->cth_stroff + CTF_NAME_OFFSET(offset);
+ if (*name == '\0')
+ return "(anon)";
+
+ return name;
+}
+
+char *
+decompress(const char *buf, size_t size, off_t len)
+{
+#ifdef ZLIB
+ z_stream stream;
+ char *data;
+ int error;
+
+ data = malloc(len);
+ if (data == NULL) {
+ warn(NULL);
+ return NULL;
+ }
+
+ memset(&stream, 0, sizeof(stream));
+ stream.next_in = (void *)buf;
+ stream.avail_in = size;
+ stream.next_out = data;
+ stream.avail_out = len;
+
+ if ((error = inflateInit(&stream)) != Z_OK) {
+ warnx("zlib inflateInit failed: %s", zError(error));
+ goto exit;
+ }
+
+ if ((error = inflate(&stream, Z_FINISH)) != Z_STREAM_END) {
+ warnx("zlib inflate failed: %s", zError(error));
+ goto exit;
+ }
+
+ if ((error = inflateEnd(&stream)) != Z_OK) {
+ warnx("zlib inflateEnd failed: %s", zError(error));
+ goto exit;
+ }
+
+ if (stream.total_out != len) {
+ warnx("decompression failed: %llu != %llu",
+ stream.total_out, len);
+ goto exit;
+ }
+
+ return data;
+
+exit:
+ free(data);
+#endif /* ZLIB */
+ return NULL;
+}
+
+__dead void
+usage(void)
+{
+ extern char *__progname;
+
+ fprintf(stderr, "usage: %s [-dfhlsSt] [file ...]\n",
+ __progname);
+ exit(1);
+}
+
projects / ctfdump / .git / commitdiff