From a3e2033e04ae06ac4f1cda582ac83944df29830d Mon Sep 17 00:00:00 2001 From: Jeff Hostetler Date: Mon, 20 Sep 2021 15:36:13 +0000 Subject: simple-ipc: preparations for supporting binary messages. Add `command_len` argument to the Simple IPC API. In my original Simple IPC API, I assumed that the request would always be a null-terminated string of text characters. The `command` argument was just a `const char *`. I found a caller that would like to pass a binary command to the daemon, so I am amending the Simple IPC API to receive `const char *command, size_t command_len` arguments. I considered changing the `command` argument to be a `void *`, but the IPC layer simply passes it to the pkt-line layer which takes a `const char *`, so to avoid confusion I left it as is. Note, the response side has always been a `struct strbuf` which includes the buffer and length, so we already support returning a binary answer. (Yes, it feels a little weird returning a binary buffer in a `strbuf`, but it works.) Signed-off-by: Jeff Hostetler Signed-off-by: Junio C Hamano --- compat/simple-ipc/ipc-unix-socket.c | 14 +++++++++----- compat/simple-ipc/ipc-win32.c | 14 +++++++++----- simple-ipc.h | 7 +++++-- t/helper/test-simple-ipc.c | 34 +++++++++++++++++++++++----------- 4 files changed, 46 insertions(+), 23 deletions(-) diff --git a/compat/simple-ipc/ipc-unix-socket.c b/compat/simple-ipc/ipc-unix-socket.c index 1927e6ef4b..4e28857a0a 100644 --- a/compat/simple-ipc/ipc-unix-socket.c +++ b/compat/simple-ipc/ipc-unix-socket.c @@ -168,7 +168,8 @@ void ipc_client_close_connection(struct ipc_client_connection *connection) int ipc_client_send_command_to_connection( struct ipc_client_connection *connection, - const char *message, struct strbuf *answer) + const char *message, size_t message_len, + struct strbuf *answer) { int ret = 0; @@ -176,7 +177,7 @@ int ipc_client_send_command_to_connection( trace2_region_enter("ipc-client", "send-command", NULL); - if (write_packetized_from_buf_no_flush(message, strlen(message), + if (write_packetized_from_buf_no_flush(message, message_len, connection->fd) < 0 || packet_flush_gently(connection->fd) < 0) { ret = error(_("could not send IPC command")); @@ -197,7 +198,8 @@ done: int ipc_client_send_command(const char *path, const struct ipc_client_connect_options *options, - const char *message, struct strbuf *answer) + const char *message, size_t message_len, + struct strbuf *answer) { int ret = -1; enum ipc_active_state state; @@ -208,7 +210,9 @@ int ipc_client_send_command(const char *path, if (state != IPC_STATE__LISTENING) return ret; - ret = ipc_client_send_command_to_connection(connection, message, answer); + ret = ipc_client_send_command_to_connection(connection, + message, message_len, + answer); ipc_client_close_connection(connection); @@ -503,7 +507,7 @@ static int worker_thread__do_io( if (ret >= 0) { ret = worker_thread_data->server_data->application_cb( worker_thread_data->server_data->application_data, - buf.buf, do_io_reply_callback, &reply_data); + buf.buf, buf.len, do_io_reply_callback, &reply_data); packet_flush_gently(reply_data.fd); } diff --git a/compat/simple-ipc/ipc-win32.c b/compat/simple-ipc/ipc-win32.c index 8dc7bda087..8e889d6a50 100644 --- a/compat/simple-ipc/ipc-win32.c +++ b/compat/simple-ipc/ipc-win32.c @@ -208,7 +208,8 @@ void ipc_client_close_connection(struct ipc_client_connection *connection) int ipc_client_send_command_to_connection( struct ipc_client_connection *connection, - const char *message, struct strbuf *answer) + const char *message, size_t message_len, + struct strbuf *answer) { int ret = 0; @@ -216,7 +217,7 @@ int ipc_client_send_command_to_connection( trace2_region_enter("ipc-client", "send-command", NULL); - if (write_packetized_from_buf_no_flush(message, strlen(message), + if (write_packetized_from_buf_no_flush(message, message_len, connection->fd) < 0 || packet_flush_gently(connection->fd) < 0) { ret = error(_("could not send IPC command")); @@ -239,7 +240,8 @@ done: int ipc_client_send_command(const char *path, const struct ipc_client_connect_options *options, - const char *message, struct strbuf *response) + const char *message, size_t message_len, + struct strbuf *response) { int ret = -1; enum ipc_active_state state; @@ -250,7 +252,9 @@ int ipc_client_send_command(const char *path, if (state != IPC_STATE__LISTENING) return ret; - ret = ipc_client_send_command_to_connection(connection, message, response); + ret = ipc_client_send_command_to_connection(connection, + message, message_len, + response); ipc_client_close_connection(connection); @@ -458,7 +462,7 @@ static int do_io(struct ipc_server_thread_data *server_thread_data) if (ret >= 0) { ret = server_thread_data->server_data->application_cb( server_thread_data->server_data->application_data, - buf.buf, do_io_reply_callback, &reply_data); + buf.buf, buf.len, do_io_reply_callback, &reply_data); packet_flush_gently(reply_data.fd); diff --git a/simple-ipc.h b/simple-ipc.h index 2c48a5ee00..9c7330fcda 100644 --- a/simple-ipc.h +++ b/simple-ipc.h @@ -107,7 +107,8 @@ void ipc_client_close_connection(struct ipc_client_connection *connection); */ int ipc_client_send_command_to_connection( struct ipc_client_connection *connection, - const char *message, struct strbuf *answer); + const char *message, size_t message_len, + struct strbuf *answer); /* * Used by the client to synchronously connect and send and receive a @@ -119,7 +120,8 @@ int ipc_client_send_command_to_connection( */ int ipc_client_send_command(const char *path, const struct ipc_client_connect_options *options, - const char *message, struct strbuf *answer); + const char *message, size_t message_len, + struct strbuf *answer); /* * Simple IPC Server Side API. @@ -144,6 +146,7 @@ typedef int (ipc_server_reply_cb)(struct ipc_server_reply_data *, */ typedef int (ipc_server_application_cb)(void *application_data, const char *request, + size_t request_len, ipc_server_reply_cb *reply_cb, struct ipc_server_reply_data *reply_data); diff --git a/t/helper/test-simple-ipc.c b/t/helper/test-simple-ipc.c index 42040ef81b..9134518075 100644 --- a/t/helper/test-simple-ipc.c +++ b/t/helper/test-simple-ipc.c @@ -112,7 +112,7 @@ static int app__slow_command(ipc_server_reply_cb *reply_cb, /* * The client sent a command followed by a (possibly very) large buffer. */ -static int app__sendbytes_command(const char *received, +static int app__sendbytes_command(const char *received, size_t received_len, ipc_server_reply_cb *reply_cb, struct ipc_server_reply_data *reply_data) { @@ -123,6 +123,13 @@ static int app__sendbytes_command(const char *received, int errs = 0; int ret; + /* + * The test is setup to send: + * "sendbytes" SP + */ + if (received_len < strlen("sendbytes ")) + BUG("received_len is short in app__sendbytes_command"); + if (skip_prefix(received, "sendbytes ", &p)) len_ballast = strlen(p); @@ -160,7 +167,7 @@ static ipc_server_application_cb test_app_cb; * by this application. */ static int test_app_cb(void *application_data, - const char *command, + const char *command, size_t command_len, ipc_server_reply_cb *reply_cb, struct ipc_server_reply_data *reply_data) { @@ -173,7 +180,7 @@ static int test_app_cb(void *application_data, if (application_data != (void*)&my_app_data) BUG("application_cb: application_data pointer wrong"); - if (!strcmp(command, "quit")) { + if (command_len == 4 && !strncmp(command, "quit", 4)) { /* * The client sent a "quit" command. This is an async * request for the server to shutdown. @@ -193,22 +200,23 @@ static int test_app_cb(void *application_data, return SIMPLE_IPC_QUIT; } - if (!strcmp(command, "ping")) { + if (command_len == 4 && !strncmp(command, "ping", 4)) { const char *answer = "pong"; return reply_cb(reply_data, answer, strlen(answer)); } - if (!strcmp(command, "big")) + if (command_len == 3 && !strncmp(command, "big", 3)) return app__big_command(reply_cb, reply_data); - if (!strcmp(command, "chunk")) + if (command_len == 5 && !strncmp(command, "chunk", 5)) return app__chunk_command(reply_cb, reply_data); - if (!strcmp(command, "slow")) + if (command_len == 4 && !strncmp(command, "slow", 4)) return app__slow_command(reply_cb, reply_data); - if (starts_with(command, "sendbytes ")) - return app__sendbytes_command(command, reply_cb, reply_data); + if (command_len >= 10 && starts_with(command, "sendbytes ")) + return app__sendbytes_command(command, command_len, + reply_cb, reply_data); return app__unhandled_command(command, reply_cb, reply_data); } @@ -488,7 +496,9 @@ static int client__send_ipc(void) options.wait_if_busy = 1; options.wait_if_not_found = 0; - if (!ipc_client_send_command(cl_args.path, &options, command, &buf)) { + if (!ipc_client_send_command(cl_args.path, &options, + command, strlen(command), + &buf)) { if (buf.len) { printf("%s\n", buf.buf); fflush(stdout); @@ -556,7 +566,9 @@ static int do_sendbytes(int bytecount, char byte, const char *path, strbuf_addstr(&buf_send, "sendbytes "); strbuf_addchars(&buf_send, byte, bytecount); - if (!ipc_client_send_command(path, options, buf_send.buf, &buf_resp)) { + if (!ipc_client_send_command(path, options, + buf_send.buf, buf_send.len, + &buf_resp)) { strbuf_rtrim(&buf_resp); printf("sent:%c%08d %s\n", byte, bytecount, buf_resp.buf); fflush(stdout); -- cgit v1.2.3