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Diffstat (limited to 'lib9p/9p.c')
-rw-r--r--lib9p/9p.c212
1 files changed, 2 insertions, 210 deletions
diff --git a/lib9p/9p.c b/lib9p/9p.c
index 74a786c..e7b20b5 100644
--- a/lib9p/9p.c
+++ b/lib9p/9p.c
@@ -6,35 +6,14 @@
#include <inttypes.h> /* for PRIu{n} */
#include <stdarg.h> /* for va_* */
-#include <stdio.h> /* for vsnprintf() */
#include <string.h> /* for strncpy() */
-#define LOG_NAME 9P
-#include <libmisc/log.h> /* for const_byte_str() */
+#include <libfmt/fmt.h> /* for fmt_vsnprintf() */
#include <lib9p/9p.h>
-#include "internal.h"
-
/* strings ********************************************************************/
-const char *lib9p_version_str(enum lib9p_version ver) {
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wtype-limits"
- assert(0 <= ver && ver < LIB9P_VER_NUM);
-#pragma GCC diagnostic pop
- return _lib9p_table_ver_name[ver];
-}
-
-const char *lib9p_msgtype_str(enum lib9p_version ver, enum lib9p_msg_type typ) {
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wtype-limits"
- assert(0 <= ver && ver < LIB9P_VER_NUM);
- assert(0 <= typ && typ <= 0xFF);
-#pragma GCC diagnostic pop
- return _lib9p_table_msg_name[ver][typ] ?: const_byte_str(typ);
-}
-
struct lib9p_s lib9p_str(char *s) {
if (!s)
return (struct lib9p_s){0};
@@ -101,7 +80,7 @@ int lib9p_errorf(struct lib9p_ctx *ctx, lib9p_errno_t linux_errno, char const *f
if (lib9p_ctx_has_error(ctx))
return -1;
va_start(args, fmt);
- n = vsnprintf(ctx->err_msg, sizeof(ctx->err_msg), fmt, args);
+ n = fmt_vsnprintf(ctx->err_msg, sizeof(ctx->err_msg), fmt, args);
va_end(args);
if ((size_t)(n+1) < sizeof(ctx->err_msg))
memset(&ctx->err_msg[n+1], 0, sizeof(ctx->err_msg)-(n+1));
@@ -114,190 +93,3 @@ int lib9p_errorf(struct lib9p_ctx *ctx, lib9p_errno_t linux_errno, char const *f
return -1;
}
-
-/* main message functions *****************************************************/
-
-static
-ssize_t _lib9p_validate(uint8_t xxx_low_typ_bit,
- const char *xxx_errmsg,
- const struct _lib9p_recv_tentry xxx_table[LIB9P_VER_NUM][0x80],
- struct lib9p_ctx *ctx, uint8_t *net_bytes) {
- /* Inspect the first 5 bytes ourselves. */
- struct _validate_ctx subctx = {
- /* input */
- .ctx = ctx,
- .net_size = uint32le_decode(net_bytes),
- .net_bytes = net_bytes,
-
- /* output */
- .net_offset = 0,
- .host_extra = 0,
- };
- if (subctx.net_size < 5)
- return lib9p_error(ctx, LINUX_EBADMSG, "message is impossibly short");
- uint8_t typ = net_bytes[4];
- if (typ % 2 != xxx_low_typ_bit)
- return lib9p_errorf(ctx, LINUX_EOPNOTSUPP, "%s: message_type=%s", xxx_errmsg,
- lib9p_msgtype_str(ctx->version, typ));
- struct _lib9p_recv_tentry tentry = xxx_table[ctx->version][typ/2];
- if (!tentry.validate)
- return lib9p_errorf(ctx, LINUX_EOPNOTSUPP, "unknown message type: %s (protocol_version=%s)",
- lib9p_msgtype_str(ctx->version, typ), lib9p_version_str(ctx->version));
-
- /* Now use the message-type-specific tentry to process the whole thing. */
- if (tentry.validate(&subctx))
- return -1;
- assert(subctx.net_offset <= subctx.net_size);
- if (subctx.net_offset < subctx.net_size)
- return lib9p_errorf(ctx, LINUX_EBADMSG, "message has %"PRIu32" extra bytes",
- subctx.net_size - subctx.net_offset);
-
- /* Return. */
- ssize_t ret;
- if (__builtin_add_overflow(tentry.basesize, subctx.host_extra, &ret))
- return lib9p_error(ctx, LINUX_EMSGSIZE, "unmarshalled payload overflows SSIZE_MAX");
- return ret;
-}
-
-ssize_t lib9p_Tmsg_validate(struct lib9p_ctx *ctx, uint8_t *net_bytes) {
- return _lib9p_validate(0, "expected a T-message but got an R-message", _lib9p_table_Tmsg_recv,
- ctx, net_bytes);
-}
-
-ssize_t lib9p_Rmsg_validate(struct lib9p_ctx *ctx, uint8_t *net_bytes) {
- return _lib9p_validate(1, "expected an R-message but got a T-message", _lib9p_table_Rmsg_recv,
- ctx, net_bytes);
-}
-
-static
-void _lib9p_unmarshal(const struct _lib9p_recv_tentry xxx_table[LIB9P_VER_NUM][0x80],
- struct lib9p_ctx *ctx, uint8_t *net_bytes,
- enum lib9p_msg_type *ret_typ, void *ret_body) {
- enum lib9p_msg_type typ = net_bytes[4];
- *ret_typ = typ;
- struct _lib9p_recv_tentry tentry = xxx_table[ctx->version][typ/2];
-
- struct _unmarshal_ctx subctx = {
- /* input */
- .ctx = ctx,
- .net_bytes = net_bytes,
-
- /* output */
- .net_offset = 0,
- .extra = ret_body + tentry.basesize,
- };
- tentry.unmarshal(&subctx, ret_body);
-}
-
-void lib9p_Tmsg_unmarshal(struct lib9p_ctx *ctx, uint8_t *net_bytes,
- enum lib9p_msg_type *ret_typ, void *ret_body) {
- _lib9p_unmarshal(_lib9p_table_Tmsg_recv,
- ctx, net_bytes, ret_typ, ret_body);
-}
-
-void lib9p_Rmsg_unmarshal(struct lib9p_ctx *ctx, uint8_t *net_bytes,
- enum lib9p_msg_type *ret_typ, void *ret_body) {
- _lib9p_unmarshal(_lib9p_table_Rmsg_recv,
- ctx, net_bytes, ret_typ, ret_body);
-}
-
-static
-bool _lib9p_marshal(const struct _lib9p_send_tentry xxx_table[LIB9P_VER_NUM][0x80],
- struct lib9p_ctx *ctx, enum lib9p_msg_type typ, void *body,
- size_t *ret_iov_cnt, struct iovec *ret_iov, uint8_t *ret_copied) {
- struct _marshal_ctx subctx = {
- /* input */
- .ctx = ctx,
-
- /* ouptut */
- .net_iov_cnt = 1,
- .net_iov = ret_iov,
- .net_copied_size = 0,
- .net_copied = ret_copied,
- };
-
- struct _lib9p_send_tentry tentry = xxx_table[ctx->version][typ/2];
- bool ret_erred = tentry.marshal(&subctx, body);
- if (ret_iov[subctx.net_iov_cnt-1].iov_len == 0)
- subctx.net_iov_cnt--;
- *ret_iov_cnt = subctx.net_iov_cnt;
- return ret_erred;
-}
-
-bool lib9p_Tmsg_marshal(struct lib9p_ctx *ctx, enum lib9p_msg_type typ, void *body,
- struct lib9p_Tmsg_send_buf *ret) {
- assert(typ % 2 == 0);
- memset(ret, 0, sizeof(*ret));
- return _lib9p_marshal(_lib9p_table_Tmsg_send,
- ctx, typ, body,
- &ret->iov_cnt, ret->iov, ret->copied);
-}
-
-bool lib9p_Rmsg_marshal(struct lib9p_ctx *ctx, enum lib9p_msg_type typ, void *body,
- struct lib9p_Rmsg_send_buf *ret) {
- assert(typ % 2 == 1);
- memset(ret, 0, sizeof(*ret));
- return _lib9p_marshal(_lib9p_table_Rmsg_send,
- ctx, typ, body,
- &ret->iov_cnt, ret->iov, ret->copied);
-}
-
-/* `struct lib9p_stat` helpers ************************************************/
-
-bool lib9p_stat_validate(struct lib9p_ctx *ctx, uint32_t net_size, uint8_t *net_bytes,
- uint32_t *ret_net_size, ssize_t *ret_host_size) {
- struct _validate_ctx subctx = {
- /* input */
- .ctx = ctx,
- .net_size = net_size,
- .net_bytes = net_bytes,
-
- /* output */
- .net_offset = 0,
- .host_extra = 0,
- };
- if (_lib9p_stat_validate(&subctx))
- return true;
- if (ret_net_size)
- *ret_net_size = subctx.net_offset;
- if (ret_host_size)
- if (__builtin_add_overflow(sizeof(struct lib9p_stat), subctx.host_extra, ret_host_size))
- return lib9p_error(ctx, LINUX_EMSGSIZE, "unmarshalled stat object overflows SSIZE_MAX");
- return false;
-}
-
-uint32_t lib9p_stat_unmarshal(struct lib9p_ctx *ctx, uint8_t *net_bytes,
- struct lib9p_stat *ret_obj, void *ret_extra) {
- struct _unmarshal_ctx subctx = {
- /* input */
- .ctx = ctx,
- .net_bytes = net_bytes,
-
- /* output */
- .net_offset = 0,
- .extra = ret_extra,
- };
- _lib9p_stat_unmarshal(&subctx, ret_obj);
- return subctx.net_offset;
-}
-
-uint32_t lib9p_stat_marshal(struct lib9p_ctx *ctx, uint32_t max_net_size, struct lib9p_stat *obj,
- uint8_t *ret_bytes) {
- struct lib9p_ctx _ctx = *ctx;
- _ctx.max_msg_size = max_net_size;
-
- struct iovec iov = {0};
- struct _marshal_ctx subctx = {
- /* input */
- .ctx = &_ctx,
-
- /* output */
- .net_iov_cnt = 1,
- .net_iov = &iov,
- .net_copied_size = 0,
- .net_copied = ret_bytes,
- };
- if (_lib9p_stat_marshal(&subctx, obj))
- return 0;
- return subctx.net_iov[0].iov_len;
-}
generated by cgit v1.2.3-2-g168b (git 2.25.1) at 2025-04-04 08:03:24 +0000