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/* srv9p/static9p.c - Serve static files over 9P
*
* Copyright (C) 2024 Luke T. Shumaker <lukeshu@lukeshu.com>
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
#include <assert.h>
#include <libmisc/vcall.h>
#include "static9p.h"
#define UNUSED(name) /* name __attribute__((unused)) */
#define p9_str(cstr) ((struct lib9p_s){ .len = strlen(cstr), .utf8 = cstr })
#define p9_nulstr ((struct lib9p_s){ .len = 0, .utf8 = NULL })
/* common *********************************************************************/
static implements_lib9p_srv_file *static_common_clone(implements_lib9p_srv_file *_self, struct lib9p_srv_ctx *ctx) {
_static_common *self = VCALL_SELF(_static_common, implements_lib9p_srv_file, _self);
assert(self);
assert(ctx);
return self;
}
static void static_common_free(implements_lib9p_srv_file *_self, struct lib9p_srv_ctx *ctx) {
_static_common *self = VCALL_SELF(_static_common, implements_lib9p_srv_file, _self);
assert(self);
assert(ctx);
/* do nothing */
}
static uint32_t static_common_io(implements_lib9p_srv_file *_self, struct lib9p_srv_ctx *ctx, lib9p_o_t UNUSED(flags)) {
_static_common *self = VCALL_SELF(_static_common, implements_lib9p_srv_file, _self);
assert(self);
assert(ctx);
return 0;
}
static void static_common_wstat(implements_lib9p_srv_file *_self, struct lib9p_srv_ctx *ctx,
struct lib9p_stat UNUSED(new)) {
_static_common *self = VCALL_SELF(_static_common, implements_lib9p_srv_file, _self);
assert(self);
assert(ctx);
lib9p_error(&ctx->basectx, LINUX_EROFS, "read-only part of filesystem");
}
static void static_common_remove(implements_lib9p_srv_file *_self, struct lib9p_srv_ctx *ctx) {
_static_common *self = VCALL_SELF(_static_common, implements_lib9p_srv_file, _self);
assert(self);
assert(ctx);
lib9p_error(&ctx->basectx, LINUX_EROFS, "read-only part of filesystem");
}
/* dir ************************************************************************/
static struct lib9p_stat static_dir_stat(implements_lib9p_srv_file *_self, struct lib9p_srv_ctx *ctx) {
struct static_dir *self = VCALL_SELF(struct static_dir, implements_lib9p_srv_file, _self);
assert(self);
assert(ctx);
return (struct lib9p_stat){
.kern_type = 0,
.kern_dev = 0,
.file_qid = {
.type = LIB9P_QT_DIR,
.vers = 1,
.path = self->pathnum,
},
.file_mode = LIB9P_DM_DIR | (self->perm & 0555),
.file_atime = self->atime,
.file_mtime = self->mtime,
.file_size = 0,
.file_name = p9_str(self->name),
.file_owner_uid = p9_str(self->u_name),
.file_owner_gid = p9_str(self->g_name),
.file_last_modified_uid = p9_str(self->m_name),
.file_extension = p9_nulstr,
.file_owner_n_uid = self->u_num,
.file_owner_n_gid = self->g_num,
.file_last_modified_n_uid = self->m_num,
};
}
static implements_lib9p_srv_file *static_dir_dopen(implements_lib9p_srv_file *_self, struct lib9p_srv_ctx *ctx,
char *childname) {
struct static_dir *self = VCALL_SELF(struct static_dir, implements_lib9p_srv_file, _self);
assert(self);
assert(ctx);
for (size_t i = 0; self->members[i]; i++) {
implements_lib9p_srv_file *filep = self->members[i];
struct lib9p_stat stat = VCALL(filep, stat, ctx);
if (lib9p_ctx_has_error(&ctx->basectx))
break;
lib9p_assert_stat(stat);
if (strcmp(stat.file_name.utf8, childname) == 0)
return filep;
}
lib9p_error(&ctx->basectx,
LINUX_ENOENT, "no such file or directory");
return NULL;
}
static implements_lib9p_srv_file *static_dir_dcreate(implements_lib9p_srv_file *_self, struct lib9p_srv_ctx *ctx,
char *UNUSED(childname),
lib9p_dm_t UNUSED(perm), lib9p_o_t UNUSED(flags)) {
struct static_dir *self = VCALL_SELF(struct static_dir, implements_lib9p_srv_file, _self);
assert(self);
assert(ctx);
lib9p_error(&ctx->basectx, LINUX_EROFS, "read-only part of filesystem");
return NULL;
}
static size_t static_dir_dread(implements_lib9p_srv_file *_self, struct lib9p_srv_ctx *ctx,
uint8_t *buf,
uint32_t byte_count,
size_t _obj_offset) {
struct static_dir *self = VCALL_SELF(struct static_dir, implements_lib9p_srv_file, _self);
assert(self);
assert(ctx);
uint32_t byte_offset = 0;
size_t obj_offset = _obj_offset;
while (self->members[obj_offset]) {
implements_lib9p_srv_file *filep = self->members[obj_offset];
struct lib9p_stat stat = VCALL(filep, stat, ctx);
if (lib9p_ctx_has_error(&ctx->basectx))
break;
lib9p_assert_stat(stat);
uint32_t nbytes = lib9p_marshal_stat(&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;
}
struct lib9p_srv_file_vtable static_dir_vtable = {
.clone = static_common_clone,
.free = static_common_free,
.io = static_common_io,
.stat = static_dir_stat,
.wstat = static_common_wstat,
.remove = static_common_remove,
.dopen = static_dir_dopen,
.dcreate = static_dir_dcreate,
.dread = static_dir_dread,
};
/* file ***********************************************************************/
static inline size_t static_file_size(struct 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 static_file_stat(implements_lib9p_srv_file *_self, struct lib9p_srv_ctx *ctx) {
struct static_file *self = VCALL_SELF(struct static_file, implements_lib9p_srv_file, _self);
assert(self);
assert(ctx);
return (struct lib9p_stat){
.kern_type = 0,
.kern_dev = 0,
.file_qid = {
.type = LIB9P_QT_FILE,
.vers = 1,
.path = self->pathnum,
},
.file_mode = self->perm & 0444,
.file_atime = self->atime,
.file_mtime = self->mtime,
.file_size = (uint64_t)static_file_size(self),
.file_name = p9_str(self->name),
.file_owner_uid = p9_str(self->u_name),
.file_owner_gid = p9_str(self->g_name),
.file_last_modified_uid = p9_str(self->m_name),
.file_extension = p9_nulstr,
.file_owner_n_uid = self->u_num,
.file_owner_n_gid = self->g_num,
.file_last_modified_n_uid = self->m_num,
};
}
static uint32_t static_file_pread(implements_lib9p_srv_file *_self, struct lib9p_srv_ctx *ctx,
void *buf,
uint32_t byte_count,
uint64_t byte_offset) {
struct static_file *self = VCALL_SELF(struct static_file, implements_lib9p_srv_file, _self);
assert(self);
assert(ctx);
size_t data_size = 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);
}
struct lib9p_srv_file_vtable static_file_vtable = {
.clone = static_common_clone,
.free = static_common_free,
.io = static_common_io,
.stat = static_file_stat,
.wstat = static_common_wstat,
.remove = static_common_remove,
.pread = static_file_pread,
.pwrite = NULL,
};
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