From: Michael Tremer <michael.tremer@ipfire.org>
Date: Fri, 3 Jan 2025 17:27:05 +0000 (+0000)
Subject: ELF: Fetch provided dependencies
X-Git-Tag: 0.9.30~557
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=85d21134fc78053377f3da8f77b392309bd8f52a;p=pakfire.git

ELF: Fetch provided dependencies

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

diff --git a/src/pakfire/build.c b/src/pakfire/build.c
index d07c5e9df..c7bfa22ef 100644
--- a/src/pakfire/build.c
+++ b/src/pakfire/build.c
@@ -584,6 +584,57 @@ ERROR:
 	return r;
 }
 
+static int pakfire_build_find_elf_provides(
+		struct pakfire_ctx* ctx, struct pakfire_file* file, struct pakfire_find_deps_ctx* deps) {
+	struct pakfire_elf* elf = NULL;
+	char** provides = NULL;
+	int r;
+
+	// Skip files that are not executable
+	if (!pakfire_file_is_executable(file))
+		return 0;
+
+	// Only handle .so files
+	if (!pakfire_file_matches(file, "**.so") && !pakfire_file_matches(file, "**.so.*"))
+		return 0;
+
+	// Try to open the ELF file
+	r = pakfire_elf_open_file(&elf, ctx, file);
+	if (r < 0) {
+		switch (-r) {
+			// This does not seem to be an ELF file
+			case ENOTSUP:
+				return 0;
+
+			// Raise any other errors
+			default:
+				goto ERROR;
+		}
+	}
+
+	// Fetch all provides
+	r = pakfire_elf_provides(elf, &provides);
+	if (r < 0)
+		goto ERROR;
+
+	// Add them all to the package
+	if (provides) {
+		for (char** p = provides; *p; p++) {
+			r = pakfire_package_add_dep(deps->pkg, PAKFIRE_PKG_PROVIDES, "%s", *p);
+			if (r < 0)
+				goto ERROR;
+		}
+	}
+
+ERROR:
+	if (provides)
+		pakfire_strings_free(provides);
+	if (elf)
+		pakfire_elf_unref(elf);
+
+	return r;
+}
+
 static int pakfire_build_find_elf_requires(
 		struct pakfire_ctx* ctx, struct pakfire_file* file, struct pakfire_find_deps_ctx* deps) {
 	struct pakfire_elf* elf = NULL;
@@ -682,7 +733,6 @@ static int pakfire_build_find_provides(
 	else if (pakfire_path_match("**.pc", path))
 		return pakfire_build_find_pkgconfig_provides(ctx, file, deps);
 
-#if 0
 	// Split certain file types differently
 	switch (pakfire_file_get_type(file)) {
 		// Regular files
@@ -693,7 +743,6 @@ static int pakfire_build_find_provides(
 				return r;
 			break;
 	}
-#endif
 
 	return 0;
 }
diff --git a/src/pakfire/elf.c b/src/pakfire/elf.c
index 8f4670815..101b1e3f0 100644
--- a/src/pakfire/elf.c
+++ b/src/pakfire/elf.c
@@ -945,10 +945,83 @@ int pakfire_elf_is_stripped(struct pakfire_elf* self) {
 	return 1;
 }
 
+static int pakfire_elf_find_provides(struct pakfire_elf* self,
+		Elf_Scn* section, const GElf_Shdr* shdr, void* data) {
+	GElf_Verdaux verdaux = {};
+	GElf_Verdef verdef = {};
+	const char* version = NULL;
+	const char* base = NULL;
+	char*** provides = data;
+	int r;
+
+	// Fetch the section data
+	Elf_Data* d = elf_getdata(section, NULL);
+
+	size_t offset = 0;
+
+	while (offset < shdr->sh_size) {
+		if (!gelf_getverdef(d, offset, &verdef))
+			break;
+
+		size_t aux_offset = offset + verdef.vd_aux;
+
+		for (int i = 0; i < verdef.vd_cnt; i++) {
+			if (!gelf_getverdaux(d, aux_offset, &verdaux))
+				break;
+
+			// Fetch the version string
+			version = elf_strptr(self->elf, shdr->sh_link, verdaux.vda_name);
+
+			// Skip empty versions
+			if (!version || !*version)
+				continue;
+
+			// Is this the base?
+			if (verdef.vd_flags & VER_FLG_BASE) {
+				base = version;
+				break;
+			}
+
+			// Add it to the list
+			r = pakfire_strings_appendf(provides, "%s(%s)%s",
+					base, version, pakfire_elf_is_elf64(self) ? "(64bit)" : "");
+			if (r < 0)
+				return r;
+
+			if (!verdaux.vda_next)
+				break;
+
+			aux_offset += verdaux.vda_next;
+		}
+
+		if (!verdef.vd_next)
+			break;
+
+		offset += verdef.vd_next;
+	}
+
+	return 0;
+}
+
+int pakfire_elf_provides(struct pakfire_elf* self, char*** provides) {
+	int r;
+
+	// Fetch the soname
+	const char* soname = pakfire_elf_soname(self);
+	if (soname) {
+		r = pakfire_strings_appendf(provides,
+				"%s()%s", soname, pakfire_elf_is_elf64(self) ? "(64bit)" : "");
+		if (r < 0)
+			return r;
+	}
+
+	return pakfire_elf_foreach_section(self, SHT_GNU_verdef, pakfire_elf_find_provides, provides);
+}
+
 static int pakfire_elf_find_requires(struct pakfire_elf* self,
 		Elf_Scn* section, const GElf_Shdr* shdr, void* data) {
-	GElf_Verneed verneed = {};
 	GElf_Vernaux vernaux = {};
+	GElf_Verneed verneed = {};
 	const char* version = NULL;
 	const char* name = NULL;
 	char*** requires = data;
diff --git a/src/pakfire/elf.h b/src/pakfire/elf.h
index d6f3ef99e..170698f59 100644
--- a/src/pakfire/elf.h
+++ b/src/pakfire/elf.h
@@ -65,6 +65,7 @@ enum {
 };
 
 // Dependencies
+int pakfire_elf_provides(struct pakfire_elf* self, char*** provides);
 int pakfire_elf_requires(struct pakfire_elf* self, char*** requires);
 
 // Source Files