From cdfdf8982f9abe9515fac24a9b3d57ddb73bc7c2 Mon Sep 17 00:00:00 2001
From: FreeArtMan <dos21h@gmail.com>
Date: Sat, 3 Sep 2016 17:29:10 +0100
Subject: Fixed strtab searching

---
 elfreader.c | 58 +++++++++++++++++++++++++++++++++++-----------------------
 elfreader.h |  2 +-
 2 files changed, 36 insertions(+), 24 deletions(-)

diff --git a/elfreader.c b/elfreader.c
index b514da3..eb0edf7 100644
--- a/elfreader.c
+++ b/elfreader.c
@@ -347,6 +347,7 @@ Elf_Ehdr* elf_header( FILE *f, Elf_Ident *ident, int sysorder )
 		elf_ehdr_32( ret, (Elf32_Ehdr *)buf, byteorder );
 		ret->type = ELF_TYPE_32;
 		ret->byteorder = byteorder;
+		PNL();
 	} else if ( class == ELF_TYPE_64 )
 	{
 		PNL();
@@ -648,10 +649,17 @@ Elf_Shdr**  elf_shdr(  FILE *f, Elf_Ehdr  *ehdr  )
 void section_info( Elf_Shdr* shdr, Elf_Shdr_strtab *strtab )
 {
 	printf("ELF SECTION HEADER:\n");
+	if ( NULL == shdr || NULL == strtab )
+	{
+		ENL();
+		return;
+	}
 	if ( strtab != NULL )
 	{
 		char *s = NULL;
 		s = strtab_name( strtab, shdr->sh_name);
+		//printf("sh_name,0x%x\n",shdr->sh_name);
+		//printf("offset,0x%x\n",strtab->offset+shdr->sh_name);
 		if ( s != NULL )
 		{
 			printf("NAME  :%s\n", s);
@@ -659,41 +667,45 @@ void section_info( Elf_Shdr* shdr, Elf_Shdr_strtab *strtab )
 			//s = NULL;
 		}
 	}
-	printf("TYPE  : 0x%02x\n", shdr->sh_type);
-	printf("OFFSET: 0x%08x\n", shdr->sh_offset);
+	printf("NAME  : 0x%08x ", shdr->sh_name);
+	printf("TYPE  : 0x%02x ", shdr->sh_type);
+	printf("OFFSET: 0x%08x ", shdr->sh_offset);
 	printf("SIZE  : 0x%08x\n", shdr->sh_size);
 }
 
-Elf_Shdr_strtab* strtab_search( FILE *f, Elf_Shdr **shdr )
+Elf_Shdr_strtab* strtab_search( FILE *f, Elf_Ehdr *ehdr, Elf_Shdr **shdr )
 {
+	uint16_t strndx;
+	int i;
+
 	Elf_Shdr_strtab *ret = NULL;
 	Elf_Shdr *iter = NULL;
 
-	if ( shdr == NULL )
+	if ( NULL == shdr || NULL == *shdr || NULL == ehdr || NULL == f )
 	{
 		return NULL;
 	}
 
-	iter = shdr[0];
-	while ( iter != NULL )
+	strndx = ehdr->e_shstrndx;
+	if (strndx != 0)
 	{
-		if ( iter->sh_type == SHT_STRTAB )
-		{
-			ret = malloc( sizeof(Elf_Shdr_strtab) );
-			ret->offset = iter->sh_offset;
-			ret->sz_tab = iter->sh_size;
-			ret->strtab = malloc(ret->sz_tab);
-			fseek( f, ret->offset, SEEK_SET );
-			if ( fread( ret->strtab, 1, ret->sz_tab, f ) != ret->sz_tab )
-			{
-				free( ret->strtab );
-				free( ret );
-				printf("Cannot read strtab\n");
-				return NULL;
-			}
-			return ret;
-		}
-		iter++;
+		iter = shdr[strndx];
+	} else
+	{
+		return NULL;
+	}
+
+	ret = malloc( sizeof(Elf_Shdr_strtab) );
+	ret->offset = iter->sh_offset;
+	ret->sz_tab = iter->sh_size;
+	ret->strtab = malloc(ret->sz_tab);
+	fseek( f, ret->offset, SEEK_SET );
+	if ( fread( ret->strtab, 1, ret->sz_tab, f ) != ret->sz_tab )
+	{
+		free( ret->strtab );
+		free( ret );
+		printf("Cannot read strtab\n");
+		return NULL;
 	}
 
 	return ret;
diff --git a/elfreader.h b/elfreader.h
index 50e08a7..06a5747 100644
--- a/elfreader.h
+++ b/elfreader.h
@@ -152,7 +152,7 @@ Elf_Shdr**  elf_shdr( FILE *f, Elf_Ehdr  *ehdr  );
 void section_info( Elf_Shdr* shdr, Elf_Shdr_strtab *strtab );
 
 /* Search for strtab section */
-Elf_Shdr_strtab* strtab_search( FILE *f, Elf_Shdr **shdr );
+Elf_Shdr_strtab* strtab_search( FILE *f, Elf_Ehdr *ehdr, Elf_Shdr **shdr );
 unsigned char* strtab_name( Elf_Shdr_strtab *strtab, long offset );
 
 #endif
\ No newline at end of file
-- 
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