X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=client.c;h=fec88a6f3f459b1f84f12790481c7a4411ae80de;hp=ce66ea7b7159c101d77896b09c77f433d1f05c54;hb=94fa6ad6ec3068227d322cb83186ff8780100107;hpb=adbf9f09c9bf2a680c61b1ef3541c04f1cde97cf

diff --git a/client.c b/client.c
index ce66ea7b..fec88a6f 100644
--- a/client.c
+++ b/client.c
@@ -1,318 +1,85 @@
 /*
- * Copyright (C) 1997-2006 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 1997-2008 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 "para.h"
-#include "config.h"
-#include <readline/readline.h>
-#include <readline/history.h>
+#include "list.h"
+#include "sched.h"
 #include "client.cmdline.h"
-#include "crypt.h"
-#include "rc4.h"
-#include <openssl/rc4.h>
-#include "net.h"
 #include "string.h"
+#include "stdin.h"
+#include "stdout.h"
+#include "client.h"
+#include "error.h"
 
-/* A static variable for holding the line. */
-static char *line_read;
+INIT_CLIENT_ERRLISTS;
 
-struct gengetopt_args_info args_info;
-
-/*
- * client log function
- */
-void para_log(int ll, const char* fmt,...)
-{
-	va_list argp;
-	FILE *outfd;
+static struct private_client_data *pcd;
+static struct stdin_task sit;
+static struct stdout_task sot;
 
-	/* ignore log message if loglevel is not high enough */
-	if (ll < args_info.loglevel_arg)
-		return;
-	if (ll < WARNING)
-		outfd = stdout;
-	else
-		outfd = stderr;
-	va_start(argp, fmt);
-	vfprintf(stdout, fmt, argp);
-	va_end(argp);
-}
 
-/*
- * Read a string, and return a pointer to it. Returns NULL on EOF.
- */
-static char *rl_gets(void)
-{
-	free(line_read);
-	/* Get a line from the user. */
-	line_read = readline("para_client> ");
-	/* If the line has any text in it, save it on the history. */
-	if (line_read && *line_read)
-		add_history(line_read);
-	return line_read;
-}
-
-/*
- * do several cleanups on sigint
- */
-static void sigint_handler(__unused int i)
-{
-	rl_cleanup_after_signal();
-	rl_reset_after_signal();
-}
+INIT_STDERR_LOGGING(pcd->conf.loglevel_arg);
 
-void get_options(int argc, char *argv[],
-	char **config_file, char **key_file)
+static void client_event_handler(struct task *t)
 {
-	char *home;
-	static char default_key_file[_POSIX_PATH_MAX] = "";
-	static char default_config_file[_POSIX_PATH_MAX] = "";
-	struct stat statbuf;
-	int ret;
+	struct private_client_data *p = t->private_data;
 
-	cmdline_parser(argc, argv, &args_info);
-	if (!args_info.user_given)
-		args_info.user_arg = para_logname();
-	if (!args_info.key_file_given) {
-		home = para_homedir();
-		sprintf(default_key_file, "%s/.paraslash/key.%s", home,
-			args_info.user_arg);
-		free(home);
-	}
-	if (!args_info.config_file_given) {
-		home = para_homedir();
-		sprintf(default_config_file, "%s/.paraslash/client.conf",
-			home);
-		free(home);
+	PARA_NOTICE_LOG("%s\n", para_strerror(-t->ret));
+	if (t->ret != -E_HANDSHAKE_COMPLETE) {
+		unregister_task(t);
+		p->error = t->ret;
+		return;
 	}
-	if (!args_info.config_file_given)
-		*config_file = default_config_file;
-	else
-		*config_file = args_info.config_file_arg;
-	ret = stat(*config_file, &statbuf);
-	if (ret && args_info.config_file_given) {
-		fprintf(stderr, "can not stat config file %s\n",
-			args_info.config_file_arg);
-		exit(EXIT_FAILURE);
+	if (p->status == CL_SENDING) {
+		stdin_set_defaults(&sit);
+		sit.buf = para_malloc(sit.bufsize),
+		register_task(&sit.task);
+		p->inbuf = sit.buf;
+		p->in_loaded = &sit.loaded;
+		p->in_error = &sit.error;
+		return;
 	}
-	if (!ret)
-		cmdline_parser_configfile(*config_file, &args_info, 0, 0, 0);
-	if (!args_info.key_file_given)
-		*key_file = default_key_file;
-	else
-		*key_file = args_info.key_file_arg;
+	stdout_set_defaults(&sot);
+	sot.buf = p->buf;
+	sot.loaded = &p->loaded;
+	sot.input_error = &p->error;
+	register_task(&sot.task);
 }
 
-static RC4_KEY rc4_recv_key;
-static RC4_KEY rc4_send_key;
-static unsigned char rc4_buf[2 * RC4_KEY_LEN];
-
-static void rc4_send(unsigned long len, const unsigned char *indata, unsigned char *outdata)
-{
-	RC4(&rc4_send_key, len, indata, outdata);
-}
-
-static void rc4_recv(unsigned long len, const unsigned char *indata, unsigned char *outdata)
-{
-	RC4(&rc4_recv_key, len, indata, outdata);
-}
-void (*crypt_function_recv)(unsigned long len, const unsigned char *indata, unsigned char *outdata);
-void (*crypt_function_send)(unsigned long len, const unsigned char *indata, unsigned char *outdata);
-
-
-static void append_str(char **data, const char* append)
-{
-	if (*data) {
-		char *tmp = make_message("%s\n%s", *data, append);
-		free(*data);
-		*data = tmp;
-	} else
-		*data = para_strdup(append);
-}
-
-/*
- * MAIN
+/**
+ * the client program to connect to para_server
+ *
+ * \param argc usual argument count
+ * \param argv usual argument vector
+ *
+ * It registers two tasks: The client task that communicates with para_server
+ * and the standard out task that writes any output produced by the client task
+ * to standard out.
+ *
+ * \return EXIT_SUCCESS or EXIT_FAILURE
+ *
+ * \sa client_open(), stdout.c, stdout.h, para_client(1), para_server(1)
  */
 int main(int argc, char *argv[])
 {
 
-	int sockfd, numbytes, i, interactive, received, ret;
-	struct hostent *he;
-	struct sockaddr_in their_addr;
-	char *command = NULL;
-	char buf[8192];
-	char *auth_str;
-	char *key_file, *config_file;
-	long unsigned challenge_nr;
-	char *line;
-
-	get_options(argc, argv, &config_file, &key_file);
-	if (args_info.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",
-		args_info.loglevel_arg,
-		config_file,
-		key_file,
-		args_info.hostname_arg,
-		args_info.server_port_arg
-	);
-	interactive = args_info.inputs_num == 0? 1 : 0;
-	if (interactive) {
-		PARA_NOTICE_LOG("%s", "no command, entering interactive mode\n");
-		signal(SIGINT, sigint_handler);
-	} else {
-		/* not interactive, concat args */
-		for (i = 0; i < args_info.inputs_num; i++)
-			append_str(&command, args_info.inputs[i]);
-	}
-interactive_loop:
-	crypt_function_recv = NULL;
-	crypt_function_send = NULL;
-	if (interactive) {
-		int i = 0;
-		char *p;
+	int ret;
+	struct sched s;
 
-		rl_save_prompt();
-		rl_message("\n");
-		rl_kill_full_line(0, 0);
-		rl_free_line_state();
-		/* read a line via readline */
-		line = rl_gets();
-		if (!line)
-			return 0;
-		if (!line[0])
-			goto interactive_loop;
-		p = line;
-		while (sscanf(p, "%200s%n", buf, &i) == 1) {
-			append_str(&command, buf);
-			p += i;
-		}
-	}
-	/* get the host info */
-	PARA_NOTICE_LOG("getting host info of %s\n",
-		args_info.hostname_arg);
-	if (!(he = get_host_info(args_info.hostname_arg)))
-		exit(EXIT_FAILURE);
-	/* get new socket */
-	if ((sockfd = get_socket()) < 0)
-		exit(EXIT_FAILURE);
-	/* init their_addr */
-	init_sockaddr(&their_addr, args_info.server_port_arg, he);
-	/* Connect */
-	PARA_NOTICE_LOG("connecting to %s...\n",
-		args_info.hostname_arg);
-	if (para_connect(sockfd, &their_addr) < 0)
-		exit(EXIT_FAILURE);
-	/* Receive Welcome message */
-	if ((numbytes = recv_buffer(sockfd, buf, sizeof(buf))) < 0)
+	s.default_timeout.tv_sec = 1;
+	s.default_timeout.tv_usec = 0;
+	ret = client_open(argc, argv, &pcd);
+	if (ret < 0) /* can not use PARA_LOG here */
 		exit(EXIT_FAILURE);
-	/* send auth command */
-	auth_str = make_message("auth %s%s", args_info.plain_given?  "" : "rc4 ",
-		args_info.user_arg);
-	PARA_INFO_LOG("<-- %s--> %s\n", buf, auth_str);
-	if (send_buffer(sockfd, auth_str) < 0)
-		exit(EXIT_FAILURE);
-	/* receive challenge number */
-	if ((numbytes = recv_buffer(sockfd, buf, sizeof(buf))) < 0)
-		exit(EXIT_FAILURE);
-	if (numbytes != 64) {
-		PARA_EMERG_LOG("did not receive valid challenge (got %i bytes)\n",
-			numbytes);
-		buf[numbytes] = '\0';
-		PARA_ERROR_LOG("received the following instead: %s\n", buf);
-		goto write_out;
-	}
-	PARA_INFO_LOG("<-- [challenge (%i bytes)]\n", numbytes);
-	/* decrypt challenge number */
-	ret = para_decrypt_challenge(key_file, &challenge_nr, (unsigned char *) buf,
-		numbytes);
-	if (ret < 0) {
-		PARA_EMERG_LOG("decrypt error (%d). Bad secret key?\n", ret);
-		exit(EXIT_FAILURE);
-	}
-	/* send decrypted challenge */
-	PARA_INFO_LOG("--> %lu\n", challenge_nr);
-	if (send_va_buffer(sockfd, "%s%lu", CHALLENGE_RESPONSE_MSG, challenge_nr) < 0)
-		exit(EXIT_FAILURE);
-	/* Wait for approval */
-	PARA_NOTICE_LOG("%s", "waiting for approval from server\n");
-	if ((numbytes = recv_buffer(sockfd, buf, sizeof(buf))) < 0)
-		exit(EXIT_FAILURE);
-	PARA_INFO_LOG("++++ server info ++++\n%s\n++++ end of server "
-		"info ++++\n", buf);
-	/* Check if server has sent "Proceed" message */
-	if (!strstr(buf, PROCEED_MSG)) {
-		PARA_EMERG_LOG("%s", "authentication failed\n");
-		exit(EXIT_FAILURE);
-	}
-	if (numbytes >= PROCEED_MSG_LEN + 32) {
-		PARA_INFO_LOG("%s", "decrypting session key\n");
-		if (para_decrypt_buffer(key_file, rc4_buf,
-				(unsigned char *)buf + PROCEED_MSG_LEN + 1,
-				numbytes - PROCEED_MSG_LEN - 1) < 0) {
-			PARA_EMERG_LOG("%s", "error receiving rc4 key\n");
-			exit(EXIT_FAILURE);
-		}
-		RC4_set_key(&rc4_send_key, RC4_KEY_LEN, rc4_buf);
-		RC4_set_key(&rc4_recv_key, RC4_KEY_LEN, rc4_buf + RC4_KEY_LEN);
-		PARA_INFO_LOG("rc4 encrytion activated: %x:%x:%x:%x\n",
-			rc4_buf[0], rc4_buf[1], rc4_buf[2], rc4_buf[3]);
-		crypt_function_recv = rc4_recv;
-		crypt_function_send = rc4_send;
-	}
-	/* send command */
-	PARA_INFO_LOG("--> %s\n", command);
-	if (send_buffer(sockfd, command) < 0)
-		exit(EXIT_FAILURE);
-	free(command);
-	command = NULL;
-	if (send_buffer(sockfd, EOC_MSG "\n") < 0)
-		exit(EXIT_FAILURE);
-	PARA_NOTICE_LOG("%s", "command sent.\n");
-write_out:
-	received = 0;
-	/* write server output to stdout */
-	while ((numbytes = recv_bin_buffer(sockfd, buf, sizeof(buf))) > 0) {
-		int ret;
-
-		if (!received && strstr(buf, AWAITING_DATA_MSG)) {
-			PARA_NOTICE_LOG("%s", "<-- awaiting data\n");
-			PARA_NOTICE_LOG("%s", "--> sending stdin\n");
-			while ((ret = read(STDIN_FILENO, buf,
-					sizeof(buf))) > 0)
-				send_bin_buffer(sockfd, buf, ret);
-			PARA_NOTICE_LOG("%s", "closing connection\n");
-			numbytes = 1;
-			break;
-		}
-		received = 1;
-		if (write(STDOUT_FILENO, buf, numbytes) != numbytes)
-			break;
-	}
-	if (!numbytes)
-		PARA_NOTICE_LOG("%s", "connection closed by peer\n");
-	close(sockfd);
-	if (interactive)
-		goto interactive_loop;
-	return 0;
+	pcd->task.event_handler = client_event_handler;
+	ret = schedule(&s);
+	if (ret < 0)
+		PARA_ERROR_LOG("%s\n", para_strerror(-ret));
+	client_close(pcd);
+	return ret >= 0? EXIT_SUCCESS: EXIT_FAILURE;
 }