X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=client.c;h=07da6529c5f690929d678678489317d9b4d29d74;hp=3fc673e7c6386238b4cada69e2ca2dff3df4c357;hb=d16fe3df649cb48d5ffa26187da3dad4c3066646;hpb=3a343b3f6bdf852848b2eb9b7d2f4f3661aa78cd

diff --git a/client.c b/client.c
index 3fc673e7..f4a4ad50 100644
--- a/client.c
+++ b/client.c
@@ -1,322 +1,621 @@
 /*
- * Copyright (C) 1997-2006 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 1997-2011 Andre Noll <maan@systemlinux.org>
  *
- *     This program is free software; you can redistribute it and/or modify
- *     it under the terms of the GNU General Public License as published by
- *     the Free Software Foundation; either version 2 of the License, or
- *     (at your option) any later version.
- *
- *     This program is distributed in the hope that it will be useful,
- *     but WITHOUT ANY WARRANTY; without even the implied warranty of
- *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *     GNU General Public License for more details.
- *
- *     You should have received a copy of the GNU General Public License
- *     along with this program; if not, write to the Free Software
- *     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
+ * Licensed under the GPL v2. For licencing details see COPYING.
  */
 
 /** \file client.c the client program used to connect to para_server */
 
+#include <regex.h>
+#include <signal.h>
+
 #include "para.h"
-#include "config.h"
-#include "client.cmdline.h"
+#include "list.h"
+#include "sched.h"
 #include "crypt.h"
-#include "rc4.h"
-#include <openssl/rc4.h>
-#include "net.h"
+#include "client.cmdline.h"
 #include "string.h"
+#include "stdin.h"
+#include "stdout.h"
+#include "client.h"
+#include "buffer_tree.h"
 #include "error.h"
-
-enum {CL_CONNECTED, CL_SENT_AUTH, CL_RECEIVED_CHALLENGE, CL_SENT_CH_RESPONSE,
-	CL_RECEIVED_PROCEED, CL_SENT_COMMAND, CL_SENDING_STDIN, CL_RECV_DATA};
-
-struct private_client_data {
-	int status;
-	int fd;
-	struct client_args_info conf;
-	char *config_file;
-	char *key_file;
-	char *user;
-	RC4_KEY rc4_recv_key;
-	RC4_KEY rc4_send_key;
-
-	char *in_buf;
-	size_t *in_loaded;
-	char *out_buf;
-	size_t *out_loaded;
-};
+#include "version.h"
 
 INIT_CLIENT_ERRLISTS;
 
-static struct private_client_data *pcd;
+static struct sched sched;
+static struct client_task *ct;
+static struct stdin_task sit;
+static struct stdout_task sot;
 
-static void rc4_send(unsigned long len, const unsigned char *indata,
-		unsigned char *outdata)
-{
-	RC4(&pcd->rc4_send_key, len, indata, outdata);
-}
+static int client_loglevel = LL_ERROR;
+DEFINE_STDERR_LOGGER(stderr_log, client_loglevel);
+__printf_2_3 void (*para_log)(int, const char*, ...) = stderr_log;
 
-static void rc4_recv(unsigned long len, const unsigned char *indata,
-		unsigned char *outdata)
-{
-	RC4(&pcd->rc4_recv_key, len, indata, outdata);
-}
+#ifdef HAVE_READLINE
+#include "interactive.h"
+#include "server_completion.h"
+#include "afs_completion.h"
 
+struct exec_task {
+	struct task task;
+	struct btr_node *btrn;
+	char *result_buf;
+	size_t result_size;
+};
 
-/*
- * client log function
- */
-void para_log(int ll, const char* fmt,...)
+static void exec_pre_select(struct sched *s, struct task *t)
 {
-	va_list argp;
+	struct exec_task *et = container_of(t, struct exec_task, task);
+	int ret = btr_node_status(et->btrn, 0, BTR_NT_LEAF);
 
-	/* ignore log message if loglevel is not high enough */
-	if (pcd && ll < pcd->conf.loglevel_arg)
-		return;
-	va_start(argp, fmt);
-	vfprintf(stderr, fmt, argp);
-	va_end(argp);
+	if (ret != 0)
+		sched_min_delay(s);
 }
 
-static void client_close(struct private_client_data *pcd)
+static void exec_post_select(__a_unused struct sched *s, struct task *t)
 {
-	if (pcd)
+	struct exec_task *et = container_of(t, struct exec_task, task);
+	struct btr_node *btrn = et->btrn;
+	char *buf;
+	size_t sz;
+	int ret;
+
+	ret = btr_node_status(btrn, 0, BTR_NT_LEAF);
+	if (ret <= 0) {
+		t->error = ret;
 		return;
-	if (pcd->fd >= 0)
-		close(pcd->fd);
-	free(pcd->user);
-	free(pcd->config_file);
-	free(pcd->key_file);
-	free(pcd);
+	}
+	sz = btr_next_buffer(btrn, &buf);
+	if (sz <= 1)
+		goto out;
+	et->result_buf = para_realloc(et->result_buf, et->result_size + sz - 1);
+	memcpy(et->result_buf + et->result_size - 1, buf, sz -  1);
+	et->result_size += sz - 1;
+	et->result_buf[et->result_size - 1] = '\0';
+out:
+	btr_consume(btrn, sz);
 }
 
-static void append_str(char **data, const char* append)
+static int make_client_argv(const char *line)
 {
-	if (*data) {
-		char *tmp = make_message("%s\n%s", *data, append);
-		free(*data);
-		*data = tmp;
-	} else
-		*data = para_strdup(append);
+	int ret;
+
+	free_argv(ct->conf.inputs);
+	ret = create_argv(line, " ", &ct->conf.inputs);
+	if (ret >= 0)
+		ct->conf.inputs_num = ret;
+	return ret;
 }
 
-static int client_parse_config(int argc, char *argv[],
-		struct private_client_data **pcd_ptr)
+static int execute_client_command(const char *cmd, char **result)
 {
-	char *home = para_homedir();
-	struct stat statbuf;
 	int ret;
-	struct private_client_data *p =
-		para_calloc(sizeof(struct private_client_data));
-
-	p->fd = -1;
-	cmdline_parser(argc, argv, &p->conf);
-	ret = - E_CLIENT_SYNTAX;
-	if (!p->conf.inputs_num)
+	struct sched command_sched = {.default_timeout = {.tv_sec = 1}};
+	struct exec_task exec_task = {
+		.task = {
+			.pre_select = exec_pre_select,
+			.post_select = exec_post_select,
+			.status = "client exec task",
+		},
+		.result_buf = para_strdup(""),
+		.result_size = 1,
+	};
+	*result = NULL;
+	ret = make_client_argv(cmd);
+	if (ret < 0)
 		goto out;
-	p->user = p->conf.user_given?
-		para_strdup(p->conf.user_arg) : para_logname();
-
-	p->key_file = p->conf.key_file_given?
-		para_strdup(p->conf.key_file_arg) :
-		make_message("%s/.paraslash/key.%s", home, p->user);
-
-	p->config_file = p->conf.config_file_given?
-		para_strdup(p->conf.config_file_arg) :
-		make_message("%s/.paraslash/client.conf", home);
-	ret = stat(p->config_file, &statbuf);
-	if (ret && p->conf.config_file_given) {
-		ret = -E_NO_CONFIG;
+	exec_task.btrn = btr_new_node(&(struct btr_node_description)
+		EMBRACE(.name = "exec_collect"));
+	register_task(&command_sched, &exec_task.task);
+	ret = client_connect(ct, &command_sched, NULL, exec_task.btrn);
+	if (ret < 0)
 		goto out;
-	}
-	if (!ret)
-		cmdline_parser_configfile(p->config_file, &p->conf, 0, 0, 0);
+	schedule(&command_sched);
+	*result = exec_task.result_buf;
+	btr_remove_node(exec_task.btrn);
+	client_disconnect(ct);
 	ret = 1;
 out:
-	free(home);
+	btr_free_node(exec_task.btrn);
 	if (ret < 0)
-		client_close(p);
-	else
-		*pcd_ptr = p;
+		free(exec_task.result_buf);
 	return ret;
 }
 
-static int send_stdin(int fd)
+static int extract_matches_from_command(const char *word, char *cmd,
+		char ***matches)
 {
-	char buf[8192];
+	char *buf, **sl;
 	int ret;
 
-	PARA_NOTICE_LOG("%s", "sending stdin\n");
-	for (;;) {
-		ret = read(STDIN_FILENO, buf, sizeof(buf));
-		if (ret <= 0)
-			return ret;
-		ret = send_bin_buffer(fd, buf, ret);
-		if (ret < 0)
-			return ret;
+	ret = execute_client_command(cmd, &buf);
+	if (ret < 0)
+		return ret;
+	ret = create_argv(buf, "\n", &sl);
+	free(buf);
+	if (ret < 0)
+		return ret;
+	ret = i9e_extract_completions(word, sl, matches);
+	free_argv(sl);
+	return ret;
+}
+
+static int complete_attributes(const char *word, char ***matches)
+{
+	return extract_matches_from_command(word, "lsatt", matches);
+}
+
+static void complete_addblob(__a_unused const char *blob_type,
+		__a_unused struct i9e_completion_info *ci,
+		__a_unused struct i9e_completion_result *cr)
+{
+	cr->filename_completion_desired = true;
+}
+
+static void generic_blob_complete(const char *blob_type,
+		struct i9e_completion_info *ci,
+		struct i9e_completion_result *cr)
+{
+	char cmd[20];
+	sprintf(cmd, "ls%s", blob_type);
+	extract_matches_from_command(ci->word, cmd, &cr->matches);
+}
+
+static void complete_catblob(const char *blob_type,
+		struct i9e_completion_info *ci,
+		struct i9e_completion_result *cr)
+{
+	generic_blob_complete(blob_type, ci, cr);
+}
+
+static void complete_lsblob(const char *blob_type,
+		struct i9e_completion_info *ci,
+		struct i9e_completion_result *cr)
+{
+	char *opts[] = {"-i", "-l", "-r", NULL};
+
+	if (ci->word[0] == '-')
+		return i9e_complete_option(opts, ci, cr);
+	generic_blob_complete(blob_type, ci, cr);
+}
+
+static void complete_rmblob(const char *blob_type,
+		struct i9e_completion_info *ci,
+		struct i9e_completion_result *cr)
+{
+	generic_blob_complete(blob_type, ci, cr);
+}
+
+static void complete_mvblob(const char *blob_type,
+		struct i9e_completion_info *ci,
+		struct i9e_completion_result *cr)
+{
+	generic_blob_complete(blob_type, ci, cr);
+}
+
+/* these don't need any completions */
+I9E_DUMMY_COMPLETER(ff);
+I9E_DUMMY_COMPLETER(hup);
+I9E_DUMMY_COMPLETER(jmp);
+I9E_DUMMY_COMPLETER(next);
+I9E_DUMMY_COMPLETER(nomore);
+I9E_DUMMY_COMPLETER(pause);
+I9E_DUMMY_COMPLETER(play);
+I9E_DUMMY_COMPLETER(si);
+I9E_DUMMY_COMPLETER(term);
+I9E_DUMMY_COMPLETER(version);
+I9E_DUMMY_COMPLETER(stop);
+I9E_DUMMY_COMPLETER(addatt);
+I9E_DUMMY_COMPLETER(init);
+
+static struct i9e_completer completers[];
+
+static void help_completer(struct i9e_completion_info *ci,
+		struct i9e_completion_result *result)
+{
+	result->matches = i9e_complete_commands(ci->word, completers);
+}
+
+static void stat_completer(struct i9e_completion_info *ci,
+		struct i9e_completion_result *cr)
+{
+	char *opts[] = {"-n=", "-p", NULL};
+	//PARA_CRIT_LOG("word: %s\n", ci->word);
+	i9e_complete_option(opts, ci, cr);
+}
+
+static void sender_completer(struct i9e_completion_info *ci,
+		struct i9e_completion_result *cr)
+{
+	char *senders[] = {"http", "dccp", "udp", NULL};
+	char *http_cmds[] = {"on", "off", "allow", "deny", "help", NULL};
+	char *dccp_cmds[] = {"on", "off", "allow", "deny", "help", NULL};
+	char *udp_cmds[] ={"on", "off", "add", "delete", "help", NULL};
+	char *sender;
+	char **cmds;
+
+	//PARA_CRIT_LOG("wn: %d\n", ci->word_num);
+	if (ci->word_num == 0 || ci->word_num > 3)
+		return;
+	if (ci->word_num == 1 || (ci->word_num == 2 && *ci->word != '\0')) {
+		i9e_extract_completions(ci->word, senders, &cr->matches);
+		return;
 	}
-	return 1;
+	sender = ci->argv[1];
+	//PARA_CRIT_LOG("sender: %s\n", sender);
+	if (strcmp(sender, "http") == 0)
+		cmds = http_cmds;
+	else if (strcmp(sender, "dccp") == 0)
+		cmds = dccp_cmds;
+	else if (strcmp(sender, "udp") == 0)
+		cmds = udp_cmds;
+	else
+		return;
+	i9e_extract_completions(ci->word, cmds, &cr->matches);
 }
 
-static int client_open(struct private_client_data *pcd)
+static void add_completer(struct i9e_completion_info *ci,
+		struct i9e_completion_result *cr)
 {
-	int ret;
-	struct hostent *he;
-	struct sockaddr_in their_addr;
+	char *opts[] = {"-a", "-l", "-f", "-v", "--", NULL};
 
-	/* get the host info */
-	PARA_NOTICE_LOG("getting host info of %s\n",
-		pcd->conf.hostname_arg);
-	ret = get_host_info(pcd->conf.hostname_arg, &he);
-	if (ret < 0)
-		goto out;
-	/* get new socket */
-	ret = get_socket();
+	if (ci->word[0] == '-')
+		i9e_complete_option(opts, ci, cr);
+	cr->filename_completion_desired = true;
+}
+
+static void ls_completer(struct i9e_completion_info *ci,
+		struct i9e_completion_result *cr)
+{
+	char *opts[] = {
+		"--", "-l", "-ls", "-ll", "-lv", "-lp", "-lm", "-lc", "-p",
+		"-a", "-r", "-d", "-sp", "-sl", "-ss", "-sn", "-sf", "-sc",
+		"-si", "-sy", "-sb", "-sd", "-sa", NULL
+	};
+	if (ci->word[0] == '-')
+		i9e_complete_option(opts, ci, cr);
+	cr->filename_completion_desired = true;
+}
+
+static void setatt_completer(struct i9e_completion_info *ci,
+		struct i9e_completion_result *cr)
+{
+	char *buf, **sl;
+	int i, ret, num_atts;
+
+	if (ci->word_num == 0)
+		return;
+
+	if (*ci->word == '/' || *ci->word == '\0')
+		cr->filename_completion_desired = true;
+	if (*ci->word == '/')
+		return;
+	ret = execute_client_command("lsatt", &buf);
 	if (ret < 0)
-		goto out;
-	pcd->fd = ret;
-	/* init their_addr */
-	init_sockaddr(&their_addr, pcd->conf.server_port_arg, he);
-	/* connect */
-	PARA_NOTICE_LOG("connecting to %s\n", pcd->conf.hostname_arg);
-	ret = para_connect(pcd->fd, &their_addr);
+		return;
+	ret = create_argv(buf, "\n", &sl);
 	if (ret < 0)
 		goto out;
-	ret = 1;
+	num_atts = ret;
+	sl = para_realloc(sl, (2 * num_atts + 1) * sizeof(char *));
+	for (i = 0; i < num_atts; i++) {
+		char *orig = sl[i];
+		sl[i] = make_message("%s+", orig);
+		sl[num_atts + i] = make_message("%s-", orig);
+		free(orig);
+	}
+	sl[2 * num_atts] = NULL;
+	ret = i9e_extract_completions(ci->word, sl, &cr->matches);
 out:
-	return ret;
+	free(buf);
+	free_argv(sl);
 }
 
+static void lsatt_completer(struct i9e_completion_info *ci,
+		struct i9e_completion_result *cr)
+{
+	char *opts[] = {"-i", "-l", "-r", NULL};
 
-/*
- * MAIN
- */
-int main(int argc, char *argv[])
+	if (ci->word[0] == '-')
+		i9e_complete_option(opts, ci, cr);
+	else
+		complete_attributes(ci->word, &cr->matches);
+}
+
+static void mvatt_completer(struct i9e_completion_info *ci,
+		struct i9e_completion_result *cr)
+{
+	complete_attributes(ci->word, &cr->matches);
+}
+
+static void rmatt_completer(struct i9e_completion_info *ci,
+		struct i9e_completion_result *cr)
+{
+	complete_attributes(ci->word, &cr->matches);
+}
+
+static void check_completer(struct i9e_completion_info *ci,
+		struct i9e_completion_result *cr)
+{
+	char *opts[] = {"-a", "-m", "-p", NULL};
+	i9e_complete_option(opts, ci, cr);
+}
+
+static void rm_completer(struct i9e_completion_info *ci,
+		struct i9e_completion_result *cr)
+{
+	char *opts[] = {"-v", "-f", "-p", NULL};
+
+	if (ci->word[0] == '-') {
+		i9e_complete_option(opts, ci, cr);
+		return;
+	}
+	cr->filename_completion_desired = true;
+}
+
+static void touch_completer(struct i9e_completion_info *ci,
+		struct i9e_completion_result *cr)
+{
+	char *opts[] = {"-n=", "-l=", "-y=", "-i=", "-a=", "-v", "-p", NULL};
+
+	if (ci->word[0] == '-')
+		i9e_complete_option(opts, ci, cr);
+	cr->filename_completion_desired = true;
+}
+
+static void cpsi_completer(struct i9e_completion_info *ci,
+		struct i9e_completion_result *cr)
 {
+	char *opts[] = {"-a", "-y", "-i", "-l", "-n", "-v", NULL};
+
+	if (ci->word[0] == '-')
+		i9e_complete_option(opts, ci, cr);
+	cr->filename_completion_desired = true;
+}
 
-	int numbytes, i, received, ret;
-	struct hostent *he;
-	struct sockaddr_in their_addr;
-	char *command = NULL;
-	char buf[8192];
-	char *auth_str;
-	long unsigned challenge_nr;
-	unsigned char rc4_buf[2 * RC4_KEY_LEN] = "";
+static void select_completer(struct i9e_completion_info *ci,
+		struct i9e_completion_result *cr)
+{
+	char *mood_buf, *pl_buf, **moods, **playlists, **mops;
+	int num_moods, num_pl, i, n, ret;
 
-	ret = client_parse_config(argc, argv, &pcd);
+	ret = execute_client_command("lsmood", &mood_buf);
 	if (ret < 0)
-		goto out;
-	if (pcd->conf.loglevel_arg <= NOTICE)
-		cmdline_parser_print_version();
-	PARA_INFO_LOG(
-		"current loglevel: %d\n"
-		"using config_file: %s\n"
-		"using key_file: %s\n"
-		"connecting to %s:%d\n",
-		pcd->conf.loglevel_arg,
-		pcd->config_file,
-		pcd->key_file,
-		pcd->conf.hostname_arg,
-		pcd->conf.server_port_arg
-	);
-	ret = client_open(pcd);
+		return;
+	ret = execute_client_command("lspl", &pl_buf);
 	if (ret < 0)
-		goto out;
-	/* receive welcome message */
-	ret = recv_buffer(pcd->fd, buf, sizeof(buf));
+		goto free_mood_buf;
+
+	ret = create_argv(mood_buf, "\n", &moods);
 	if (ret < 0)
-		goto out;
-	/* send auth command */
-	auth_str = make_message("auth %s%s", pcd->conf.plain_given?  "" : "rc4 ",
-		pcd->user);
-	PARA_INFO_LOG("<-- %s--> %s\n", buf, auth_str);
-	ret = send_buffer(pcd->fd, auth_str);
+		goto free_pl_buf;
+	num_moods = ret;
+	ret = create_argv(pl_buf, "\n", &playlists);
 	if (ret < 0)
-		goto out;
-	/* receive challenge number */
-	ret = recv_buffer(pcd->fd, buf, sizeof(buf));
+		goto free_moods;
+	num_pl = ret;
+	n = num_moods + num_pl;
+	mops = para_malloc((n + 1) * sizeof(char *));
+	for (i = 0; i < num_moods; i++)
+		mops[i] = make_message("m/%s", moods[i]);
+	for (i = 0; i < num_pl; i++)
+		mops[num_moods + i] = make_message("p/%s", playlists[i]);
+	mops[n] = NULL;
+	i9e_extract_completions(ci->word, mops, &cr->matches);
+	free_argv(mops);
+	free_argv(playlists);
+free_moods:
+	free_argv(moods);
+free_pl_buf:
+	free(pl_buf);
+free_mood_buf:
+	free(mood_buf);
+}
+
+#define DEFINE_BLOB_COMPLETER(cmd, blob_type) \
+	static void cmd ## blob_type ## _completer( \
+		struct i9e_completion_info *ci, \
+		struct i9e_completion_result *cr) \
+	{complete_ ## cmd ## blob(#blob_type, ci, cr);}
+
+DEFINE_BLOB_COMPLETER(add, mood)
+DEFINE_BLOB_COMPLETER(add, lyr)
+DEFINE_BLOB_COMPLETER(add, img)
+DEFINE_BLOB_COMPLETER(add, pl)
+DEFINE_BLOB_COMPLETER(cat, mood)
+DEFINE_BLOB_COMPLETER(cat, lyr)
+DEFINE_BLOB_COMPLETER(cat, img)
+DEFINE_BLOB_COMPLETER(cat, pl)
+DEFINE_BLOB_COMPLETER(ls, mood)
+DEFINE_BLOB_COMPLETER(ls, lyr)
+DEFINE_BLOB_COMPLETER(ls, img)
+DEFINE_BLOB_COMPLETER(ls, pl)
+DEFINE_BLOB_COMPLETER(rm, mood)
+DEFINE_BLOB_COMPLETER(rm, lyr)
+DEFINE_BLOB_COMPLETER(rm, img)
+DEFINE_BLOB_COMPLETER(rm, pl)
+DEFINE_BLOB_COMPLETER(mv, mood)
+DEFINE_BLOB_COMPLETER(mv, lyr)
+DEFINE_BLOB_COMPLETER(mv, img)
+DEFINE_BLOB_COMPLETER(mv, pl)
+
+static int client_i9e_line_handler(char *line)
+{
+	int ret;
+
+	client_disconnect(ct);
+	if (!line || !*line)
+		return 0;
+	PARA_DEBUG_LOG("line handler: %s\n", line);
+	ret = make_client_argv(line);
 	if (ret < 0)
-		goto out;
-	if (ret != 64) {
-		ret = -E_INVALID_CHALLENGE;
-		PARA_ERROR_LOG("received the following: %s\n", buf);
-		goto out;
-	}
-	PARA_INFO_LOG("%s", "<-- [challenge]\n");
-	/* decrypt challenge number */
-	ret = para_decrypt_challenge(pcd->key_file, &challenge_nr,
-		(unsigned char *) buf, 64);
+		return ret;
+	ret = client_connect(ct, &sched, NULL, NULL);
 	if (ret < 0)
-		goto out;
-	/* send decrypted challenge */
-	PARA_INFO_LOG("--> %lu\n", challenge_nr);
-	ret = send_va_buffer(pcd->fd, "%s%lu", CHALLENGE_RESPONSE_MSG, challenge_nr);
+		return ret;
+	i9e_attach_to_stdout(ct->btrn);
+	return 1;
+}
+
+static void client_sighandler(int s)
+{
+	i9e_signal_dispatch(s);
+}
+
+static struct i9e_completer completers[] = {
+	SERVER_COMPLETERS
+	AFS_COMPLETERS
+	{.name = NULL}
+};
+
+__noreturn static void interactive_session(void)
+{
+	int ret;
+	char *history_file;
+	struct sigaction act;
+	struct i9e_client_info ici = {
+		.fds = {0, 1, 2},
+		.prompt = "para_client> ",
+		.line_handler = client_i9e_line_handler,
+		.loglevel = client_loglevel,
+		.completers = completers,
+	};
+
+	PARA_NOTICE_LOG("\n%s\n", VERSION_TEXT("client"));
+	if (ct->conf.history_file_given)
+		history_file = para_strdup(ct->conf.history_file_arg);
+	else {
+		char *home = para_homedir();
+		history_file = make_message("%s/.paraslash/client.history",
+			home);
+		free(home);
+	}
+	ici.history_file = history_file;
+
+	act.sa_handler = client_sighandler;
+	sigemptyset(&act.sa_mask);
+	act.sa_flags = 0;
+	sigaction(SIGINT, &act, NULL);
+	sched.select_function = i9e_select;
+
+	ret = i9e_open(&ici, &sched);
 	if (ret < 0)
 		goto out;
-	/* wait for approval */
-	PARA_NOTICE_LOG("%s", "waiting for approval from server\n");
-	ret = recv_buffer(pcd->fd, buf, sizeof(buf));
+	para_log = i9e_log;
+	ret = schedule(&sched);
+	i9e_close();
+	para_log = stderr_log;
+out:
 	if (ret < 0)
-		goto out;
-	numbytes = ret;
-	PARA_INFO_LOG("++++ server info ++++\n%s\n++++ end of server "
-		"info ++++\n", buf);
-	/* check if server has sent "Proceed" message */
-	ret = -E_CLIENT_AUTH;
-	if (!strstr(buf, PROCEED_MSG))
-		goto out;
-	if (numbytes >= PROCEED_MSG_LEN + 32) {
-		PARA_INFO_LOG("%s", "decrypting session key\n");
-		ret = para_decrypt_buffer(pcd->key_file, rc4_buf,
-			(unsigned char *)buf + PROCEED_MSG_LEN + 1,
-			numbytes - PROCEED_MSG_LEN - 1);
-		if (ret < 0)
-			goto out;
-		RC4_set_key(&pcd->rc4_send_key, RC4_KEY_LEN, rc4_buf);
-		RC4_set_key(&pcd->rc4_recv_key, RC4_KEY_LEN, rc4_buf + RC4_KEY_LEN);
-		PARA_INFO_LOG("rc4 encryption activated: %x:%x:%x:%x\n",
-			rc4_buf[0], rc4_buf[1], rc4_buf[2], rc4_buf[3]);
-		enable_crypt(pcd->fd, rc4_recv, rc4_send);
+		PARA_ERROR_LOG("%s\n", para_strerror(-ret));
+	exit(ret < 0? EXIT_FAILURE : EXIT_SUCCESS);
+	//client_close(ct);
+}
+
+__noreturn static void print_completions(void)
+{
+	int ret = i9e_print_completions(completers);
+	exit(ret <= 0? EXIT_FAILURE : EXIT_SUCCESS);
+}
+
+#else /* HAVE_READLINE */
+
+__noreturn static void interactive_session(void)
+{
+	PARA_EMERG_LOG("interactive sessions not available\n");
+	exit(EXIT_FAILURE);
+}
+
+__noreturn static void print_completions(void)
+{
+	PARA_EMERG_LOG("command completion not available\n");
+	exit(EXIT_FAILURE);
+}
+
+#endif /* HAVE_READLINE */
+
+static void supervisor_post_select(struct sched *s, struct task *t)
+{
+	if (ct->task.error < 0) {
+		t->error = ct->task.error;
+		return;
+	}
+	if (ct->status == CL_SENDING) {
+		stdin_set_defaults(&sit);
+		register_task(s, &sit.task);
+		t->error = -E_TASK_STARTED;
+		return;
 	}
-	/* concat args */
-	for (i = 0; i < pcd->conf.inputs_num; i++)
-		append_str(&command, pcd->conf.inputs[i]);
-	/* send command */
-	PARA_INFO_LOG("--> %s\n", command);
-	ret = send_buffer(pcd->fd, command);
+	if (ct->status == CL_RECEIVING) {
+		stdout_set_defaults(&sot);
+		register_task(s, &sot.task);
+		t->error = -E_TASK_STARTED; return;
+	}
+}
+
+static struct task svt = {
+	.post_select = supervisor_post_select,
+	.status = "supervisor task"
+};
+
+/**
+ * The client program to connect to para_server.
+ *
+ * \param argc Usual argument count.
+ * \param argv Usual argument vector.
+ *
+ * When called without a paraslash command, an interactive session is started.
+ * Otherwise, the client task and the supervisor task are started. The former
+ * communicates with para_server while the latter monitors whether the client
+ * task intends to read from stdin or write to stdout.
+ *
+ * Once it has been determined whether the client command corresponds to a
+ * stdin command (addmood, addimg, ..), either the stdin task or the stdout
+ * task is set up to replace the supervisor task.
+ *
+ * \return EXIT_SUCCESS or EXIT_FAILURE
+ *
+ * \sa client_open(), stdin.c, stdout.c, para_client(1), para_server(1)
+ */
+int main(int argc, char *argv[])
+{
+	int ret;
+
+	init_random_seed_or_die();
+	sched.default_timeout.tv_sec = 1;
+
+	ret = client_parse_config(argc, argv, &ct, &client_loglevel);
 	if (ret < 0)
 		goto out;
-	free(command);
-	command = NULL;
-	ret = send_buffer(pcd->fd, EOC_MSG "\n");
+	if (ct->conf.complete_given)
+		print_completions();
+	if (ret == 0)
+		interactive_session(); /* does not return */
+
+	/*
+	 * We add buffer tree nodes for stdin and stdout even though
+	 * only one of them will be needed. This simplifies the code
+	 * a bit wrt. to the buffer tree setup.
+	 */
+	sit.btrn = btr_new_node(&(struct btr_node_description)
+		EMBRACE(.name = "stdin"));
+	ret = client_open(argc, argv, &ct, &client_loglevel, sit.btrn, NULL, &sched);
 	if (ret < 0)
 		goto out;
-	PARA_NOTICE_LOG("%s", "command sent.\n");
-	received = 0;
-	for (;;) {
-		ret = recv_bin_buffer(pcd->fd, buf, sizeof(buf) - 1);
-		if (ret <= 0) {
-			if (!ret)
-				PARA_NOTICE_LOG("%s", "connection closed by peer\n");
-			goto out;
-		}
-		buf[ret] = '\0';
-		numbytes = ret;
-		if (!received && strstr(buf, AWAITING_DATA_MSG)) {
-			ret = send_stdin(pcd->fd);
-			goto out;
-		}
-		received = 1;
-		ret = write(STDOUT_FILENO, buf, numbytes);
-		if (ret != numbytes) {
-			ret = -E_SHORT_CLIENT_WRITE;
-			goto out;
-		}
-	}
-	client_close(pcd);
+	sot.btrn = btr_new_node(&(struct btr_node_description)
+		EMBRACE(.name = "stdout", .parent = ct->btrn));
+	register_task(&sched, &svt);
+	ret = schedule(&sched);
 out:
-	if (ret < 0)
-		PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
-	return ret >= 0? EXIT_SUCCESS: EXIT_FAILURE;
+	client_close(ct);
+	btr_free_node(sit.btrn);
+	btr_free_node(sot.btrn);
+	if (ret < 0) {
+		/* can not use PARA_LOG here because ct is NULL */
+		fprintf(stderr, "%s\n", para_strerror(-ret));
+		return EXIT_FAILURE;
+	}
+	return EXIT_SUCCESS;
 }