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/* lib9p_util/static.c - Serve static files over 9P
*
* Copyright (C) 2024-2025 Luke T. Shumaker <lukeshu@lukeshu.com>
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
#include <libmisc/assert.h>
#include <libmisc/macro.h>
#include <util9p/static.h>
LO_IMPLEMENTATION_C(lib9p_srv_file, struct util9p_static_dir, util9p_static_dir, static);
LO_IMPLEMENTATION_C(lib9p_srv_file, struct util9p_static_file, util9p_static_file, static);
/* dir ************************************************************************/
static void util9p_static_dir_free(struct util9p_static_dir *self) {
assert(self);
}
static struct lib9p_qid util9p_static_dir_qid(struct util9p_static_dir *self) {
assert(self);
return (struct lib9p_qid){
.type = LIB9P_QT_DIR,
.vers = 1,
.path = self->pathnum,
};
}
static uint32_t util9p_static_dir_chio(struct util9p_static_dir *self, struct lib9p_srv_ctx *ctx, bool, bool, bool) {
assert(self);
assert(ctx);
return 0;
}
static struct lib9p_stat util9p_static_dir_stat(struct util9p_static_dir *self, struct lib9p_srv_ctx *ctx) {
assert(self);
assert(ctx);
return (struct lib9p_stat){
.kern_type = 0,
.kern_dev = 0,
.file_qid = util9p_static_dir_qid(self),
.file_mode = LIB9P_DM_DIR | (self->perm & 0555),
.file_atime = self->atime,
.file_mtime = self->mtime,
.file_size = 0,
.file_name = lib9p_str(self->name),
.file_owner_uid = lib9p_str(self->u_name),
.file_owner_gid = lib9p_str(self->g_name),
.file_last_modified_uid = lib9p_str(self->m_name),
.file_extension = lib9p_str(NULL),
.file_owner_n_uid = self->u_num,
.file_owner_n_gid = self->g_num,
.file_last_modified_n_uid = self->m_num,
};
}
static void util9p_static_dir_wstat(struct util9p_static_dir *self, struct lib9p_srv_ctx *ctx,
struct lib9p_stat) {
assert(self);
assert(ctx);
lib9p_error(&ctx->basectx, LINUX_EROFS, "read-only part of filesystem");
}
static void util9p_static_dir_remove(struct util9p_static_dir *self, struct lib9p_srv_ctx *ctx) {
assert(self);
assert(ctx);
lib9p_error(&ctx->basectx, LINUX_EROFS, "read-only part of filesystem");
}
static lo_interface lib9p_srv_file util9p_static_dir_dopen(struct util9p_static_dir *self, struct lib9p_srv_ctx *ctx,
struct lib9p_s childname) {
assert(self);
assert(ctx);
for (size_t i = 0; !LO_IS_NULL(self->members[i]); i++) {
lo_interface lib9p_srv_file file = self->members[i];
struct lib9p_stat stat = LO_CALL(file, stat, ctx);
if (lib9p_ctx_has_error(&ctx->basectx))
break;
lib9p_stat_assert(stat);
if (lib9p_str_eq(stat.file_name, childname))
return file;
}
lib9p_error(&ctx->basectx,
LINUX_ENOENT, "no such file or directory");
return LO_NULL(lib9p_srv_file);
}
static lo_interface lib9p_srv_file util9p_static_dir_dcreate(struct util9p_static_dir *self, struct lib9p_srv_ctx *ctx,
struct lib9p_s LM_UNUSED(childname),
lib9p_dm_t LM_UNUSED(perm), lib9p_o_t LM_UNUSED(flags)) {
assert(self);
assert(ctx);
lib9p_error(&ctx->basectx, LINUX_EROFS, "read-only part of filesystem");
return LO_NULL(lib9p_srv_file);
}
static size_t util9p_static_dir_dread(struct util9p_static_dir *self, struct lib9p_srv_ctx *ctx,
uint8_t *buf,
uint32_t byte_count,
size_t _obj_offset) {
assert(self);
assert(ctx);
uint32_t byte_offset = 0;
size_t obj_offset = _obj_offset;
while (!LO_IS_NULL(self->members[obj_offset])) {
lo_interface lib9p_srv_file file = self->members[obj_offset];
struct lib9p_stat stat = LO_CALL(file, stat, ctx);
if (lib9p_ctx_has_error(&ctx->basectx))
break;
lib9p_stat_assert(stat);
uint32_t nbytes = lib9p_stat_marshal(&ctx->basectx, byte_count-byte_offset, &stat,
&buf[byte_offset]);
if (!nbytes) {
if (obj_offset == _obj_offset)
lib9p_error(&ctx->basectx,
LINUX_ERANGE, "stat object does not fit into negotiated max message size");
break;
}
byte_offset += nbytes;
obj_offset++;
}
return obj_offset - _obj_offset;
}
LIB9P_SRV_NOTFILE(struct util9p_static_dir, util9p_static_dir)
/* file ***********************************************************************/
static void util9p_static_file_free(struct util9p_static_file *self) {
assert(self);
}
static struct lib9p_qid util9p_static_file_qid(struct util9p_static_file *self) {
assert(self);
return (struct lib9p_qid){
.type = LIB9P_QT_FILE,
.vers = 1,
.path = self->pathnum,
};
}
static uint32_t util9p_static_file_chio(struct util9p_static_file *self, struct lib9p_srv_ctx *ctx, bool, bool, bool) {
assert(self);
assert(ctx);
return 0;
}
static inline size_t util9p_static_file_size(struct util9p_static_file *file) {
assert(file);
#if __unix__
assert(file->data_start);
#endif
if (!file->data_end)
return file->data_size;
return (size_t)((uintptr_t)file->data_end - (uintptr_t)file->data_start);
}
static struct lib9p_stat util9p_static_file_stat(struct util9p_static_file *self, struct lib9p_srv_ctx *ctx) {
assert(self);
assert(ctx);
return (struct lib9p_stat){
.kern_type = 0,
.kern_dev = 0,
.file_qid = util9p_static_file_qid(self),
.file_mode = self->perm & 0444,
.file_atime = self->atime,
.file_mtime = self->mtime,
.file_size = (uint64_t)util9p_static_file_size(self),
.file_name = lib9p_str(self->name),
.file_owner_uid = lib9p_str(self->u_name),
.file_owner_gid = lib9p_str(self->g_name),
.file_last_modified_uid = lib9p_str(self->m_name),
.file_extension = lib9p_str(NULL),
.file_owner_n_uid = self->u_num,
.file_owner_n_gid = self->g_num,
.file_last_modified_n_uid = self->m_num,
};
}
static void util9p_static_file_wstat(struct util9p_static_file *self, struct lib9p_srv_ctx *ctx,
struct lib9p_stat) {
assert(self);
assert(ctx);
lib9p_error(&ctx->basectx, LINUX_EROFS, "read-only part of filesystem");
}
static void util9p_static_file_remove(struct util9p_static_file *self, struct lib9p_srv_ctx *ctx) {
assert(self);
assert(ctx);
lib9p_error(&ctx->basectx, LINUX_EROFS, "read-only part of filesystem");
}
LIB9P_SRV_NOTDIR(struct util9p_static_file, util9p_static_file)
static uint32_t util9p_static_file_pread(struct util9p_static_file *self, struct lib9p_srv_ctx *ctx,
void *buf,
uint32_t byte_count,
uint64_t byte_offset) {
assert(self);
assert(ctx);
size_t data_size = util9p_static_file_size(self);
if (byte_offset > (uint64_t)data_size) {
lib9p_error(&ctx->basectx,
LINUX_EINVAL, "offset is past end-of-file length");
return 0;
}
size_t beg_off = (size_t)byte_offset;
size_t end_off = beg_off + (size_t)byte_count;
if (end_off > data_size)
end_off = data_size;
memcpy(buf, &self->data_start[beg_off], end_off-beg_off);
return (uint32_t)(end_off-beg_off);
}
static uint32_t util9p_static_file_pwrite(struct util9p_static_file *self, struct lib9p_srv_ctx *ctx,
void *LM_UNUSED(buf),
uint32_t LM_UNUSED(byte_count),
uint64_t LM_UNUSED(byte_offset)) {
assert(self);
assert(ctx);
lib9p_error(&ctx->basectx, LINUX_EROFS, "read-only part of filesystem");
return 0;
}
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