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Route all module interaction through dispatch

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A module is addressed by name and command string, and nothing else.
Typed API access handed a caller a pointer into the callee's function
table, which meant compiling against that module's struct layout — a
build-time dependency between modules that the design does not permit.
Removing it also removes the manifest, the table magic constant, and
the table size field, which existed only to describe and validate
those tables.

Load validation is now three steps: reserved contract symbols resolve,
the minimum-version handshake passes, and the version and description
probes return well-formed values. The contract is four reserved
symbols, and a module's interface is the command vocabulary it
documents.

Documentation is brought in line, and artifacts are named exactly:
libdpm-core.so for the library, <dpm/core.h> for the header, the dpm
binary for the command-line tool.
This commit is contained in:
Chris Punches
2026-08-15 02:15:18 -04:00
parent 267529bee3
commit 97b39cac6c
17 changed files with 263 additions and 702 deletions
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95
tests/fixtures/src/bad_magic.cpp vendored
View File

@@ -1,95 +0,0 @@
/**
* @file bad_magic.cpp
* @brief Broken fixture: API table with a wrong magic constant
*
* Contract-complete, but its declared table opens with garbage instead
* of the spec magic. libdpm-core must refuse it at validation step 5.
*
* Part of the Dark Horse Linux Package Manager (DPM)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <cstdint>
namespace {
struct table_header {
uint32_t magic;
uint32_t size;
};
struct manifest_entry {
const char* api_name;
int table_version;
const char* symbol;
};
struct manifest {
uint32_t count;
const manifest_entry* entries;
};
} // namespace
struct badmagic_api_v1_s {
table_header hdr;
int (*ping)(void);
};
static int ping(void)
{
return 0;
}
extern "C" {
extern const struct badmagic_api_v1_s badmagic_api_v1;
const struct badmagic_api_v1_s badmagic_api_v1 = {
{ 0xDEADBEEFu, sizeof(struct badmagic_api_v1_s) },
ping,
};
}
extern "C" const char* dpm_module_version(void)
{
return "1.0.0";
}
extern "C" const char* dpm_module_description(void)
{
return "Fixture with a bad table magic.";
}
extern "C" const char* dpm_module_core_min(void)
{
return "0.1.0";
}
extern "C" const void* dpm_module_manifest(void)
{
static const manifest_entry entries[] = {
{ "badmagic", 1, "badmagic_api_v1" },
};
static const manifest m = { 1, entries };
return &m;
}
extern "C" int dpm_module_execute(void* ctx, const char* command,
int argc, char** argv)
{
(void)ctx;
(void)command;
(void)argc;
(void)argv;
return 0;
}

23
tests/fixtures/src/bad_version.cpp vendored
View File

@@ -20,23 +20,6 @@
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <cstdint>
namespace {
struct manifest_entry {
const char* api_name;
int table_version;
const char* symbol;
};
struct manifest {
uint32_t count;
const manifest_entry* entries;
};
} // namespace
extern "C" const char* dpm_module_version(void)
{
return "banana";
@@ -52,12 +35,6 @@ extern "C" const char* dpm_module_core_min(void)
return "0.1.0";
}
extern "C" const void* dpm_module_manifest(void)
{
static const manifest m = { 0, nullptr };
return &m;
}
extern "C" int dpm_module_execute(void* ctx, const char* command,
int argc, char** argv)
{

23
tests/fixtures/src/core_too_new.cpp vendored
View File

@@ -21,23 +21,6 @@
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <cstdint>
namespace {
struct manifest_entry {
const char* api_name;
int table_version;
const char* symbol;
};
struct manifest {
uint32_t count;
const manifest_entry* entries;
};
} // namespace
extern "C" const char* dpm_module_version(void)
{
return "1.0.0";
@@ -53,12 +36,6 @@ extern "C" const char* dpm_module_core_min(void)
return "99.0.0";
}
extern "C" const void* dpm_module_manifest(void)
{
static const manifest m = { 0, nullptr };
return &m;
}
extern "C" int dpm_module_execute(void* ctx, const char* command,
int argc, char** argv)
{

61
tests/fixtures/src/good.cpp vendored
View File

@@ -3,8 +3,9 @@
* @brief Known-good stub module fixture
*
* A complete, valid DPM module written against the documented module
* contract with its own declarations — no libdpm-core headers — exactly
* as a standalone module author would. Used to validate the happy path.
* contract with its own declarations — no libdpm-core.so headers —
* exactly as a standalone module author would. Used to validate the
* happy path.
*
* Part of the Dark Horse Linux Package Manager (DPM)
*
@@ -21,45 +22,7 @@
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <cstdint>
namespace {
struct table_header {
uint32_t magic;
uint32_t size;
};
struct manifest_entry {
const char* api_name;
int table_version;
const char* symbol;
};
struct manifest {
uint32_t count;
const manifest_entry* entries;
};
} // namespace
struct good_api_v1_s {
table_header hdr;
int (*ping)(void);
};
static int ping(void)
{
return 42;
}
extern "C" {
extern const struct good_api_v1_s good_api_v1;
const struct good_api_v1_s good_api_v1 = {
{ 0x314D5044u /* "DPM1" */, sizeof(struct good_api_v1_s) },
ping,
};
}
#include <cstring>
extern "C" const char* dpm_module_version(void)
{
@@ -76,21 +39,17 @@ extern "C" const char* dpm_module_core_min(void)
return "0.1.0";
}
extern "C" const void* dpm_module_manifest(void)
{
static const manifest_entry entries[] = {
{ "good", 1, "good_api_v1" },
};
static const manifest m = { 1, entries };
return &m;
}
/* Answers "ping" with 42 so a dispatch round trip is observable, and
0 for anything else. */
extern "C" int dpm_module_execute(void* ctx, const char* command,
int argc, char** argv)
{
(void)ctx;
(void)command;
(void)argc;
(void)argv;
if (command && std::strcmp(command, "ping") == 0) {
return 42;
}
return 0;
}

72
tests/fixtures/src/lying_manifest.cpp vendored
View File

@@ -1,72 +0,0 @@
/**
* @file lying_manifest.cpp
* @brief Broken fixture: manifest declares an API it doesn't export
*
* Contract-complete, but its manifest names a table symbol that does
* not exist in the .so. libdpm-core must refuse it at validation step 4.
*
* Part of the Dark Horse Linux Package Manager (DPM)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <cstdint>
namespace {
struct manifest_entry {
const char* api_name;
int table_version;
const char* symbol;
};
struct manifest {
uint32_t count;
const manifest_entry* entries;
};
} // namespace
extern "C" const char* dpm_module_version(void)
{
return "1.0.0";
}
extern "C" const char* dpm_module_description(void)
{
return "Fixture whose manifest lies.";
}
extern "C" const char* dpm_module_core_min(void)
{
return "0.1.0";
}
extern "C" const void* dpm_module_manifest(void)
{
static const manifest_entry entries[] = {
{ "ghost", 1, "ghost_api_v1" },
};
static const manifest m = { 1, entries };
return &m;
}
extern "C" int dpm_module_execute(void* ctx, const char* command,
int argc, char** argv)
{
(void)ctx;
(void)command;
(void)argc;
(void)argv;
return 0;
}