Print ELF header/segments/sections

[centaur.git] / src / elfhandle.c

diff --git a/src/elfhandle.c b/src/elfhandle.c
new file mode 100644 (file)
index 0000000..a17216d
--- /dev/null
+++ b/src/elfhandle.c
@@ -0,0 +1,74 @@
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <libelf.h>
+
+#include "elfhandle.h"
+
+
+void openElf(ELFHandles *h, char *fn, Elf_Cmd elfmode)
+{
+  int openflags = 0;
+  int openmode = 0;
+
+  h->e = NULL;
+
+  switch(elfmode) {
+    case ELF_C_READ:
+      openflags = O_RDONLY;
+      break;
+    case ELF_C_WRITE:
+      openflags = O_WRONLY | O_CREAT;
+      openmode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
+      break;
+    case ELF_C_RDWR:
+      openflags = O_RDWR;
+      break;
+    default:
+      return;
+  }
+
+
+  h->fd = open(fn, openflags, openmode);
+  if (h->fd < 0) {
+    fprintf(stderr, "Cannot open %s: %s\n", fn, strerror(errno));
+    return;
+  }
+
+  h->e = elf_begin(h->fd, elfmode, NULL);
+  if (!h->e) {
+    fprintf(stderr, "elf_begin() failed on %s: %s\n", fn, elf_errmsg(-1));
+    goto ERR;
+  }
+
+  if (elfmode == ELF_C_READ || elfmode == ELF_C_RDWR) {
+    if (elf_kind(h->e) != ELF_K_ELF) {
+      fprintf(stderr, "Not an ELF object: %s", fn);
+      goto ERR;
+    }
+  }
+
+  return;
+
+ERR:
+  if (h->e) {
+    elf_end(h->e);
+    h->e = NULL;
+  }
+  close(h->fd);
+}
+
+
+void closeElf(ELFHandles *h)
+{
+  if (h->e) {
+    elf_end(h->e);
+    close(h->fd);
+    h->e = NULL;
+  }
+}