Print ELF header/segments/sections

[centaur.git] / src / printing / header.c

diff --git a/src/printing/header.c b/src/printing/header.c
new file mode 100644 (file)
index 0000000..33f7bdb
--- /dev/null
+++ b/src/printing/header.c
@@ -0,0 +1,62 @@
+#include <stdio.h>
+
+#include <libelf.h>
+#include <gelf.h>
+
+
+void printHeader(Elf *e)
+{
+  GElf_Ehdr ehdr;
+  int elfclass;
+  size_t shdrnum, shdrstrndx, phdrnum;
+
+
+  printf("ELF header:\n");
+
+
+  elfclass = gelf_getclass(e);
+  if (elfclass == ELFCLASSNONE) {
+    fprintf(stderr, "getclass() failed: %s\n", elf_errmsg(-1));
+  }
+  printf(" * %d-bit ELF object\n", elfclass == ELFCLASS32 ? 32 : 64);
+
+
+  if (!gelf_getehdr(e, &ehdr)) {
+    fprintf(stderr, "getehdr() failed: %s.", elf_errmsg(-1));
+    return;
+  }
+
+  printf(" *     type  machine  version    entry    phoff    shoff    flags   ehsize phentsize shentsize\n");
+  printf("   %8jx %8jx %8jx %8jx %8jx %8jx %8jx %8jx %9jx %9jx\n",
+          (uintmax_t) ehdr.e_type,
+          (uintmax_t) ehdr.e_machine,
+          (uintmax_t) ehdr.e_version,
+          (uintmax_t) ehdr.e_entry,
+          (uintmax_t) ehdr.e_phoff,
+          (uintmax_t) ehdr.e_shoff,
+          (uintmax_t) ehdr.e_flags,
+          (uintmax_t) ehdr.e_ehsize,
+          (uintmax_t) ehdr.e_phentsize,
+          (uintmax_t) ehdr.e_shentsize);
+
+
+  if (elf_getshdrnum(e, &shdrnum) != 0) {
+    fprintf(stderr, "getshdrnum() failed: %s\n", elf_errmsg(-1));
+  } else {
+    printf(" * (shnum):    %u\n", shdrnum);
+  }
+
+  if (elf_getshdrstrndx(e, &shdrstrndx) != 0) {
+    fprintf(stderr, "getshdrstrndx() failed: %s\n", elf_errmsg(-1));
+  } else {
+    printf(" * (shstrndx): %u\n", shdrstrndx);
+  }
+
+  if (elf_getphdrnum(e, &phdrnum) != 0) {
+    fprintf(stderr, "getphdrnum() failed: %s\n", elf_errmsg(-1));
+  } else {
+    printf(" * (phnum):    %u\n", phdrnum);
+  }
+
+  printf("\n");
+}