First memory model of an ELF file

1 files changed, 152 insertions, 0 deletions

diff --git a/src/model/fromFile.c b/src/model/fromFile.c
new file mode 100644
index 0000000..f349335
--- /dev/null
+++ b/src/model/fromFile.c
@@ -0,0 +1,152 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <libelf.h>
+#include <gelf.h>
+
+#include <libelfu/libelfu.h>
+
+
+ElfuPhdr* elfu_modelFromPhdr(GElf_Phdr *phdr)
+{
+  ElfuPhdr *mp;
+
+  mp = malloc(sizeof(ElfuPhdr));
+  if (!mp) {
+    return NULL;
+  }
+
+  mp->phdr = *phdr;
+
+  return mp;
+}
+
+
+ElfuScn* elfu_modelFromSection(Elf_Scn *scn)
+{
+  ElfuScn *ms;
+  Elf_Data *data;
+
+  ms = malloc(sizeof(ElfuScn));
+  if (!ms) {
+    return NULL;
+  }
+
+  CIRCLEQ_INIT(&ms->dataList);
+
+
+  if (gelf_getshdr(scn, &ms->shdr) != &ms->shdr) {
+    fprintf(stderr, "gelf_getshdr() failed: %s\n", elf_errmsg(-1));
+    goto out;
+  }
+
+
+
+  /* Copy each data part in source segment */
+  data = elf_rawdata(scn, NULL);
+  while (data) {
+    ElfuData *md;
+
+    md = malloc(sizeof(ElfuData));
+    if (!md) {
+      goto out;
+    }
+
+    md->data = *data;
+
+    CIRCLEQ_INSERT_TAIL(&ms->dataList, md, elem);
+
+    data = elf_rawdata(scn, data);
+  }
+
+  return ms;
+
+  out:
+  // FIXME
+  return NULL;
+}
+
+
+
+
+ElfuElf* elfu_modelFromElf(Elf *e)
+{
+  ElfuElf *me;
+
+  me = malloc(sizeof(ElfuElf));
+  if (!me) {
+    return NULL;
+  }
+
+  CIRCLEQ_INIT(&me->scnList);
+  CIRCLEQ_INIT(&me->phdrList);
+
+  /*
+   * General stuff
+   */
+  me->elfclass = gelf_getclass(e);
+  if (me->elfclass == ELFCLASSNONE) {
+    fprintf(stderr, "getclass() failed: %s\n", elf_errmsg(-1));
+  }
+
+  if (!gelf_getehdr(e, &me->ehdr)) {
+    fprintf(stderr, "gelf_getehdr() failed: %s\n", elf_errmsg(-1));
+    goto out;
+  }
+
+
+  /*
+   * Sections
+   */
+  Elf_Scn *scn;
+
+  scn = elf_getscn(e, 1);
+  while (scn) {
+    ElfuScn *ms = elfu_modelFromSection(scn);
+
+    if (ms) {
+      CIRCLEQ_INSERT_TAIL(&me->scnList, ms, elem);
+    } else {
+      goto out;
+    }
+
+    scn = elf_nextscn(e, scn);
+  }
+
+
+
+  /*
+   * Segments
+   */
+  size_t i, n;
+
+  if (elf_getphdrnum(e, &n)) {
+    fprintf(stderr, "elf_getphdrnum() failed: %s\n", elf_errmsg(-1));
+  }
+
+  for (i = 0; i < n; i++) {
+    GElf_Phdr phdr;
+    ElfuPhdr *mp;
+
+    if (gelf_getphdr(e, i, &phdr) != &phdr) {
+      fprintf(stderr, "gelf_getphdr() failed for #%d: %s\n", i, elf_errmsg(-1));
+      break;
+    }
+
+    mp = elfu_modelFromPhdr(&phdr);
+
+    if (mp) {
+      CIRCLEQ_INSERT_TAIL(&me->phdrList, mp, elem);
+    } else {
+      goto out;
+    }
+  }
+
+
+
+  return me;
+
+  out:
+  // FIXME
+  return NULL;
+}