X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=command.c;h=bd3d17c8335bea17bcd95ec909ddeef8cf779d7f;hp=d0aeea3dc895bf60749a212b1076ef5be8bc18bb;hb=79a88784e0819c1bbe9de8d39a0e05997c8211f6;hpb=bd28ec9a64884d70917c4fdea1a3a70c91758f83 diff --git a/command.c b/command.c index d0aeea3d..bd3d17c8 100644 --- a/command.c +++ b/command.c @@ -1,8 +1,4 @@ -/* - * Copyright (C) 1997 Andre Noll - * - * Licensed under the GPL v2. For licencing details see COPYING. - */ +/* Copyright (C) 1997 Andre Noll , see file COPYING. */ /** \file command.c Client authentication and server commands. */ @@ -20,18 +16,19 @@ #include "server.lsg.h" #include "para.h" #include "error.h" +#include "lsu.h" #include "crypt.h" #include "sideband.h" #include "command.h" #include "string.h" #include "afh.h" #include "afs.h" +#include "net.h" #include "server.h" #include "list.h" #include "send.h" #include "sched.h" #include "vss.h" -#include "net.h" #include "daemon.h" #include "fd.h" #include "ipc.h" @@ -107,18 +104,18 @@ static unsigned get_status(struct misc_meta_data *nmmd, bool parser_friendly, clock_get_realtime(¤t_time); /* * The calls to WRITE_STATUS_ITEM() below never fail because - * b->max_size is zero (unlimited), see para_printf(). However, clang - * is not smart enough to prove this and complains nevertheless. + * b->max_size is zero (unlimited), see \ref para_printf(). However, + * clang is not smart enough to prove this and complains nevertheless. * Casting the return value to void silences clang. */ - (void)WRITE_STATUS_ITEM(&b, SI_STATUS, "%s\n", status); - (void)WRITE_STATUS_ITEM(&b, SI_STATUS_FLAGS, "%s\n", flags); - (void)WRITE_STATUS_ITEM(&b, SI_OFFSET, "%li\n", offset); - (void)WRITE_STATUS_ITEM(&b, SI_AFS_MODE, "%s\n", mmd->afs_mode_string); - (void)WRITE_STATUS_ITEM(&b, SI_STREAM_START, "%lu.%lu\n", + (void)WRITE_STATUS_ITEM(&b, SI_status, "%s\n", status); + (void)WRITE_STATUS_ITEM(&b, SI_status_flags, "%s\n", flags); + (void)WRITE_STATUS_ITEM(&b, SI_offset, "%li\n", offset); + (void)WRITE_STATUS_ITEM(&b, SI_afs_mode, "%s\n", mmd->afs_mode_string); + (void)WRITE_STATUS_ITEM(&b, SI_stream_start, "%lu.%lu\n", (long unsigned)nmmd->stream_start.tv_sec, (long unsigned)nmmd->stream_start.tv_usec); - (void)WRITE_STATUS_ITEM(&b, SI_CURRENT_TIME, "%lu.%lu\n", + (void)WRITE_STATUS_ITEM(&b, SI_current_time, "%lu.%lu\n", (long unsigned)current_time.tv_sec, (long unsigned)current_time.tv_usec); free(flags); @@ -227,7 +224,7 @@ static int check_sender_args(struct command_context *cc, struct lls_parse_result *lpr, struct sender_command_data *scd) { int i, ret; - const char *subcmds[] = {SENDER_SUBCOMMANDS}; + const char * const subcmds[] = {SENDER_SUBCOMMANDS}; const char *arg; char *errctx; unsigned num_inputs = lls_num_inputs(lpr); @@ -246,10 +243,10 @@ static int check_sender_args(struct command_context *cc, return -E_COMMAND_SYNTAX; scd->sender_num = i; arg = lls_input(1, lpr); - for (i = 0; subcmds[i]; i++) + for (i = 0; i < NUM_SENDER_CMDS; i++) if (!strcmp(subcmds[i], arg)) break; - if (!subcmds[i]) + if (i == NUM_SENDER_CMDS) return -E_COMMAND_SYNTAX; scd->cmd_num = i; if (!senders[scd->sender_num].client_cmds[scd->cmd_num]) @@ -398,7 +395,7 @@ static int com_si(struct command_context *cc, "supported audio formats: %s\n", ut, mmd->num_played, (int)getppid(), - (int)mmd->afs_pid, + (int)afs_pid, mmd->active_connections, mmd->num_commands, mmd->num_connects, @@ -426,41 +423,40 @@ EXPORT_SERVER_CMD_HANDLER(version); /** These status items are cleared if no audio file is currently open. */ #define EMPTY_STATUS_ITEMS \ - ITEM(PATH) \ - ITEM(DIRECTORY) \ - ITEM(BASENAME) \ - ITEM(SCORE) \ - ITEM(ATTRIBUTES_BITMAP) \ - ITEM(ATTRIBUTES_TXT) \ - ITEM(HASH) \ - ITEM(IMAGE_ID) \ - ITEM(IMAGE_NAME) \ - ITEM(LYRICS_ID) \ - ITEM(LYRICS_NAME) \ - ITEM(BITRATE) \ - ITEM(FORMAT) \ - ITEM(FREQUENCY) \ - ITEM(CHANNELS) \ - ITEM(DURATION) \ - ITEM(SECONDS_TOTAL) \ - ITEM(NUM_PLAYED) \ - ITEM(LAST_PLAYED) \ - ITEM(TECHINFO) \ - ITEM(ARTIST) \ - ITEM(TITLE) \ - ITEM(YEAR) \ - ITEM(ALBUM) \ - ITEM(COMMENT) \ - ITEM(MTIME) \ - ITEM(FILE_SIZE) \ - ITEM(CHUNK_TIME) \ - ITEM(NUM_CHUNKS) \ - ITEM(AMPLIFICATION) \ + ITEM(path) \ + ITEM(directory) \ + ITEM(basename) \ + ITEM(score) \ + ITEM(attributes_bitmap) \ + ITEM(attributes_txt) \ + ITEM(hash) \ + ITEM(image_id) \ + ITEM(image_name) \ + ITEM(lyrics_id) \ + ITEM(lyrics_name) \ + ITEM(bitrate) \ + ITEM(format) \ + ITEM(frequency) \ + ITEM(channels) \ + ITEM(duration) \ + ITEM(seconds_total) \ + ITEM(num_played) \ + ITEM(last_played) \ + ITEM(techinfo) \ + ITEM(artist) \ + ITEM(title) \ + ITEM(year) \ + ITEM(album) \ + ITEM(comment) \ + ITEM(mtime) \ + ITEM(file_size) \ + ITEM(chunk_time) \ + ITEM(num_chunks) \ + ITEM(amplification) \ -/** - * Write a list of audio-file related status items with empty values. - * - * This is used by vss when currently no audio file is open. +/* + * Create a set of audio-file related status items with empty values. These are + * written to stat clients when no audio file is open. */ static unsigned empty_status_items(bool parser_friendly, char **result) { @@ -533,63 +529,35 @@ out: } EXPORT_SERVER_CMD_HANDLER(stat); -/* fixed-length, human readable permission string */ -const char *server_cmd_perms_str(unsigned int perms) +const char *aux_info_cb(unsigned cmd_num, bool verbose) { - static char result[5]; - - result[0] = perms & AFS_READ? 'a' : '-'; - result[1] = perms & AFS_WRITE? 'A' : '-'; - result[2] = perms & VSS_READ? 'v' : '-'; - result[3] = perms & VSS_WRITE? 'V' : '-'; - result[4] = '\0'; - return result; -} + static char result[80]; + unsigned perms = server_command_perms[cmd_num]; -static int send_list_of_commands(struct command_context *cc) -{ - int i; - const struct lls_command *cmd; - char *msg = para_strdup(""); - - for (i = 1; (cmd = lls_cmd(i, server_cmd_suite)); i++) { - const char *perms = server_cmd_perms_str(server_command_perms[i]); - char *tmp = make_message("%s%s\t%s\t%s\n", msg, - lls_command_name(cmd), perms, lls_purpose(cmd)); - free(msg); - msg = tmp; + if (verbose) { + /* permissions: VSS_READ | VSS_WRITE */ + sprintf(result, "permissions: %s", + server_command_perms_txt[cmd_num]); + } else { + result[0] = perms & AFS_READ? 'a' : '-'; + result[1] = perms & AFS_WRITE? 'A' : '-'; + result[2] = perms & VSS_READ? 'v' : '-'; + result[3] = perms & VSS_WRITE? 'V' : '-'; + result[4] = '\0'; } - return send_sb(&cc->scc, msg, strlen(msg), SBD_OUTPUT, false); + return result; } static int com_help(struct command_context *cc, struct lls_parse_result *lpr) { - const char *perms; - char *long_help, *buf, *errctx; + char *buf; int ret; - const struct lls_command *cmd; + unsigned n; + bool long_help = SERVER_CMD_OPT_GIVEN(HELP, LONG, lpr); - ret = lls(lls_check_arg_count(lpr, 0, 1, &errctx)); - if (ret < 0) { - send_errctx(cc, errctx); - return ret; - } - if (lls_num_inputs(lpr) == 0) - return send_list_of_commands(cc); - /* argument given for help */ - ret = lls(lls_lookup_subcmd(lls_input(0, lpr), server_cmd_suite, - &errctx)); - if (ret < 0) { - send_errctx(cc, errctx); - return ret; - } - cmd = lls_cmd(ret, server_cmd_suite); - perms = server_command_perms_txt[ret]; - long_help = lls_long_help(cmd); - assert(long_help); - ret = xasprintf(&buf, "%spermissions: %s\n", long_help, perms); - free(long_help); - return send_sb(&cc->scc, buf, ret, SBD_OUTPUT, false); + lsu_com_help(long_help, lpr, server_cmd_suite, aux_info_cb, &buf, &n); + ret = send_sb(&cc->scc, buf, n, SBD_OUTPUT, false); + return ret; } EXPORT_SERVER_CMD_HANDLER(help); @@ -745,12 +713,11 @@ out: } EXPORT_SERVER_CMD_HANDLER(jmp); -static int com_tasks(struct command_context *cc, +/* deprecated, does nothing */ +static int com_tasks(__a_unused struct command_context *cc, __a_unused struct lls_parse_result *lpr) { - char *tl = server_get_tasks(); - assert(tl); - return send_sb(&cc->scc, tl, strlen(tl), SBD_OUTPUT, false); + return 1; } EXPORT_SERVER_CMD_HANDLER(tasks); @@ -809,8 +776,7 @@ out: #define HANDSHAKE_BUFSIZE 4096 -static int run_command(struct command_context *cc, struct iovec *iov, - const char *peername) +static int run_command(struct command_context *cc, struct iovec *iov) { int ret, i, argc; char *p, *end, **argv; @@ -843,8 +809,8 @@ static int run_command(struct command_context *cc, struct iovec *iov, p += strlen(p) + 1; } argv[argc] = NULL; - PARA_NOTICE_LOG("calling com_%s() for %s@%s\n", lls_command_name(lcmd), - cc->u->name, peername); + PARA_NOTICE_LOG("calling com_%s() for user %s\n", + lls_command_name(lcmd), cc->u->name); ret = lls(lls_parse(argc, argv, lcmd, &lpr, &errctx)); if (ret >= 0) { const struct server_cmd_user_data *ud = lls_user_data(lcmd); @@ -865,7 +831,6 @@ static int run_command(struct command_context *cc, struct iovec *iov, * Perform user authentication and execute a command. * * \param fd The file descriptor to send output to. - * \param peername Identifies the connecting peer. * * Whenever para_server accepts an incoming tcp connection on the port it * listens on, it forks and the resulting child calls this function. @@ -880,20 +845,20 @@ static int run_command(struct command_context *cc, struct iovec *iov, * permissions to execute that command, the function calls the corresponding * command handler which does argument checking and further processing. * - * In order to cope with a DOS attacks, a timeout is set up which terminates + * In order to cope with DOS attacks, a timeout is set up which terminates * the function if the connection was not authenticated when the timeout * expires. * - * \sa alarm(2), crypt.c, crypt.h + * \sa alarm(2), \ref crypt.c, \ref crypt.h. */ -__noreturn void handle_connect(int fd, const char *peername) +__noreturn void handle_connect(int fd) { int ret; unsigned char rand_buf[CHALLENGE_SIZE + 2 * SESSION_KEY_LEN]; unsigned char challenge_hash[HASH_SIZE]; char *command = NULL, *buf = para_malloc(HANDSHAKE_BUFSIZE) /* must be on the heap */; size_t numbytes; - struct command_context cc_struct = {.peer = peername}, *cc = &cc_struct; + struct command_context cc_struct = {.u = NULL}, *cc = &cc_struct; struct iovec iov; struct connection_features cf; @@ -972,7 +937,7 @@ __noreturn void handle_connect(int fd, const char *peername) ret = recv_sb(&cc->scc, SBD_COMMAND, MAX_COMMAND_LEN, &iov); if (ret < 0) goto net_err; - ret = run_command(cc, &iov, peername); + ret = run_command(cc, &iov); free(iov.iov_base); if (ret < 0) goto err_out;