From: Michael Tremer <michael.tremer@ipfire.org>
Date: Wed, 1 Jan 2025 17:08:11 +0000 (+0000)
Subject: ELF: Add function to check if a file is stripped
X-Git-Tag: 0.9.30~607
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3ffc45efd5e570d7f5b9e47aa46744b6d4bde930;p=pakfire.git

ELF: Add function to check if a file is stripped

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
---

diff --git a/src/libpakfire/elf.c b/src/libpakfire/elf.c
index 5e59f74fe..4ad4b3e12 100644
--- a/src/libpakfire/elf.c
+++ b/src/libpakfire/elf.c
@@ -232,3 +232,54 @@ const char* pakfire_elf_build_id(struct pakfire_elf* self) {
 
 	return self->build_id;
 }
+
+static int pakfire_elf_get_section(struct pakfire_elf* self,
+		const Elf64_Word type, Elf_Scn** section, GElf_Shdr* header, Elf_Data** data) {
+	Elf_Scn* s = NULL;
+	GElf_Shdr shdr;
+
+	// Walk through all sections
+	for (;;) {
+		s = elf_nextscn(self->elf, s);
+		if (!s)
+			break;
+
+		// Fetch the section header
+		gelf_getshdr(s, &shdr);
+
+		// Return any matching sections
+		if (shdr.sh_type == type) {
+			*section = s;
+
+			// Send header if requested
+			if (header)
+				gelf_getshdr(s, header);
+
+			// Send data if requested
+			if (data)
+				*data = elf_getdata(s, NULL);
+
+			return 0;
+		}
+	}
+
+	// No section found
+	return 1;
+}
+
+int pakfire_elf_is_stripped(struct pakfire_elf* self) {
+	Elf_Scn* symtab = NULL;
+
+	switch (pakfire_elf_type(self)) {
+		// Do not check Relocatable Objects
+		case ET_REL:
+			return 0;
+
+		// Check everything else
+		default:
+			break;
+	}
+
+	// Fetch the symbol table
+	return pakfire_elf_get_section(self, SHT_SYMTAB, &symtab, NULL, NULL);
+}
diff --git a/src/libpakfire/include/pakfire/elf.h b/src/libpakfire/include/pakfire/elf.h
index a5038030a..0ecf6a56b 100644
--- a/src/libpakfire/include/pakfire/elf.h
+++ b/src/libpakfire/include/pakfire/elf.h
@@ -41,6 +41,8 @@ const char* pakfire_elf_path(struct pakfire_elf* self);
 int pakfire_elf_type(struct pakfire_elf* self);
 const char* pakfire_elf_build_id(struct pakfire_elf* self);
 
+int pakfire_elf_is_stripped(struct pakfire_elf* self);
+
 #endif /* PAKFIRE_PRIVATE */
 
 #endif /* PAKFIRE_ELF_H */