-unsigned char *read_rpanote(const char *fname, int *nnp)
-{
- int notefd, nr, i;
- int ph, ps, np;
- int note, notesize;
-
- notefd = open(fname, O_RDONLY);
- if (notefd < 0) {
- perror(fname);
- exit(1);
- }
- nr = read(notefd, notebuf, sizeof(notebuf));
- if (nr < 0) {
- perror("read note");
- exit(1);
- }
- if (nr == 0) /* empty file */
- return NULL;
- if (nr < E_HSIZE ||
- memcmp(¬ebuf[E_IDENT+EI_MAGIC], elf_magic, 4) != 0 ||
- notebuf[E_IDENT+EI_CLASS] != ELFCLASS32 ||
- notebuf[E_IDENT+EI_DATA] != ELFDATA2MSB)
- goto notelf;
- close(notefd);
-
- /* now look for the RPA-note */
- ph = GET_32BE(notebuf, E_PHOFF);
- ps = GET_16BE(notebuf, E_PHENTSIZE);
- np = GET_16BE(notebuf, E_PHNUM);
- if (ph < E_HSIZE || ps < PH_HSIZE || np < 1)
- goto notelf;
-
- for (i = 0; i < np; ++i, ph += ps) {
- if (GET_32BE(notebuf, ph + PH_TYPE) != PT_NOTE)
- continue;
- note = GET_32BE(notebuf, ph + PH_OFFSET);
- notesize = GET_32BE(notebuf, ph + PH_FILESZ);
- if (notesize < 34 || note + notesize > nr)
- continue;
- if (GET_32BE(notebuf, note) != strlen(rpaname) + 1 ||
- GET_32BE(notebuf, note + 8) != 0x12759999 ||
- strcmp((char *)¬ebuf[note + 12], rpaname) != 0)
- continue;
- /* looks like an RPA note, return it */
- *nnp = notesize;
- return ¬ebuf[note];
- }
- /* no RPA note found */
- return NULL;
-
- notelf:
- fprintf(stderr, "%s is not a big-endian 32-bit ELF image\n", fname);
- exit(1);
-}
-