audioc: kill unused --timeout option
[paraslash.git] / client.c
index ce66ea7..94fff72 100644 (file)
--- a/client.c
+++ b/client.c
 /** \file client.c the client program used to connect to para_server */
 
 #include "para.h"
+#include "list.h"
+#include "sched.h"
 #include "config.h"
-#include <readline/readline.h>
-#include <readline/history.h>
 #include "client.cmdline.h"
 #include "crypt.h"
 #include "rc4.h"
 #include <openssl/rc4.h>
 #include "net.h"
+#include "fd.h"
 #include "string.h"
+#include "stdin.h"
+#include "stdout.h"
+#include "error.h"
 
-/* A static variable for holding the line. */
-static char *line_read;
+enum {
+       CL_CONNECTED,
+       CL_RECEIVED_WELCOME,
+       CL_SENT_AUTH,
+       CL_RECEIVED_CHALLENGE,
+       CL_SENT_CH_RESPONSE,
+       CL_RECEIVED_PROCEED,
+       CL_SENT_COMMAND,
+       CL_SENDING_STDIN,
+       CL_RECEIVING_SERVER_OUTPUT
+};
+
+#define CLIENT_BUFSIZE 8192
+
+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;
+       struct task task;
+       int eof;
+       char buf[CLIENT_BUFSIZE];
+       size_t loaded;
+       int check_r;
+       int check_w;
+       long unsigned challenge_nr;
+       /* only used if stdin gets sent to para_server */
+       char *inbuf;
+       size_t *in_loaded;
+       int *in_eof;
+};
+
+INIT_CLIENT_ERRLISTS;
+
+static struct private_client_data *pcd;
+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 void rc4_recv(unsigned long len, const unsigned char *indata,
+               unsigned char *outdata)
+{
+       RC4(&pcd->rc4_recv_key, len, indata, outdata);
+}
 
-struct gengetopt_args_info args_info;
 
 /*
  * client log function
@@ -40,279 +95,346 @@ struct gengetopt_args_info args_info;
 void para_log(int ll, const char* fmt,...)
 {
        va_list argp;
-       FILE *outfd;
 
        /* ignore log message if loglevel is not high enough */
-       if (ll < args_info.loglevel_arg)
+       if (pcd && ll < pcd->conf.loglevel_arg)
                return;
-       if (ll < WARNING)
-               outfd = stdout;
-       else
-               outfd = stderr;
        va_start(argp, fmt);
-       vfprintf(stdout, fmt, argp);
+       vfprintf(stderr, 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)
+static void client_close(struct private_client_data *pcd)
 {
-       rl_cleanup_after_signal();
-       rl_reset_after_signal();
+       if (pcd)
+               return;
+       if (pcd->fd >= 0)
+               close(pcd->fd);
+       free(pcd->user);
+       free(pcd->config_file);
+       free(pcd->key_file);
+       free(pcd);
 }
 
-void get_options(int argc, char *argv[],
-       char **config_file, char **key_file)
+static int client_parse_config(int argc, char *argv[],
+               struct private_client_data **pcd_ptr)
 {
-       char *home;
-       static char default_key_file[_POSIX_PATH_MAX] = "";
-       static char default_config_file[_POSIX_PATH_MAX] = "";
+       char *home = para_homedir();
        struct stat statbuf;
        int ret;
+       struct private_client_data *p =
+               para_calloc(sizeof(struct private_client_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);
-       }
-       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);
+       p->fd = -1;
+       cmdline_parser(argc, argv, &p->conf);
+       ret = - E_CLIENT_SYNTAX;
+       if (!p->conf.inputs_num)
+               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;
+               goto out;
        }
        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;
+               cmdline_parser_configfile(p->config_file, &p->conf, 0, 0, 0);
+       ret = 1;
+       *pcd_ptr = p;
+       PARA_INFO_LOG(
+               "current loglevel: %d\n"
+               "using config_file: %s\n"
+               "using key_file: %s\n"
+               "connecting to %s:%d\n" ,
+               p->conf.loglevel_arg,
+               p->config_file,
+               p->key_file,
+               p->conf.hostname_arg, p->conf.server_port_arg
+       );
+out:
+       free(home);
+       if (ret < 0)
+               client_close(p);
+       return ret;
 }
 
-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)
+static void client_pre_select(struct sched *s, struct task *t)
 {
-       RC4(&rc4_send_key, len, indata, outdata);
-}
+       struct private_client_data *p = t->private_data;
 
-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);
+       PARA_INFO_LOG("status %d\n", p->status);
+       t->ret = 1;
+       pcd->check_r = 0;
+       pcd->check_w = 0;
+       if (p->fd < 0)
+               return;
+       switch (pcd->status) {
+       case CL_CONNECTED:
+       case CL_SENT_AUTH:
+       case CL_SENT_CH_RESPONSE:
+       case CL_SENT_COMMAND:
+               para_fd_set(pcd->fd, &s->rfds, &s->max_fileno);
+               pcd->check_r = 1;
+               return;
+
+       case CL_RECEIVED_WELCOME:
+       case CL_RECEIVED_CHALLENGE:
+       case CL_RECEIVED_PROCEED:
+               para_fd_set(pcd->fd, &s->wfds, &s->max_fileno);
+               pcd->check_w = 1;
+               return;
 
+       case CL_RECEIVING_SERVER_OUTPUT:
+               if (pcd->loaded < CLIENT_BUFSIZE - 1) {
+                       para_fd_set(pcd->fd, &s->rfds, &s->max_fileno);
+                       p->check_r = 1;
+               }
+               return;
+       case CL_SENDING_STDIN:
+               if (*p->in_loaded) {
+                       PARA_INFO_LOG("loaded: %d\n", *p->in_loaded);
+                       para_fd_set(p->fd, &s->wfds, &s->max_fileno);
+                       p->check_w = 1;
+               } else {
+                       if (*p->in_eof) {
+                               t->ret = -E_INPUT_EOF;
+                               s->timeout.tv_sec = 0;
+                               s->timeout.tv_usec = 1;
+                       }
+               }
+               return;
+       }
+}
 
-static void append_str(char **data, const char* append)
+static ssize_t client_recv_buffer(struct private_client_data *p)
 {
-       if (*data) {
-               char *tmp = make_message("%s\n%s", *data, append);
-               free(*data);
-               *data = tmp;
-       } else
-               *data = para_strdup(append);
+       ssize_t ret = recv_buffer(p->fd, p->buf + p->loaded,
+               CLIENT_BUFSIZE - p->loaded);
+       if (!ret)
+               return -E_SERVER_EOF;
+       if (ret > 0)
+               p->loaded += ret;
+       return ret;
+
 }
 
-/*
- * MAIN
- */
-int main(int argc, char *argv[])
+static void client_post_select(struct sched *s, struct task *t)
 {
+       struct private_client_data *p = t->private_data;
 
-       int sockfd, numbytes, i, interactive, received, ret;
+       PARA_INFO_LOG("status %d\n", p->status);
+       t->ret = 1;
+       if (p->fd < 0)
+               return;
+       if (!p->check_r && !p->check_w)
+               return;
+       if (p->check_r && !FD_ISSET(p->fd, &s->rfds))
+               return;
+       if (p->check_w && !FD_ISSET(p->fd, &s->wfds))
+               return;
+       switch (p->status) {
+       case CL_CONNECTED: /* receive welcome message */
+               t->ret = client_recv_buffer(p);
+               if (t->ret > 0)
+                       p->status = CL_RECEIVED_WELCOME;
+               return;
+       case CL_RECEIVED_WELCOME: /* send auth command */
+               sprintf(p->buf, "auth %s%s", p->conf.plain_given?
+                       "" : "rc4 ", p->user);
+               PARA_INFO_LOG("--> %s\n", p->buf);
+               t->ret = send_buffer(p->fd, p->buf);
+               if (t->ret >= 0)
+                       p->status = CL_SENT_AUTH;
+               return;
+       case CL_SENT_AUTH: /* receive challenge number */
+               p->loaded = 0;
+               t->ret = client_recv_buffer(p);
+               if (t->ret < 0)
+                       return;
+               if (t->ret != 64) {
+                       t->ret = -E_INVALID_CHALLENGE;
+                       PARA_ERROR_LOG("received the following: %s\n", p->buf);
+                       return;
+               }
+               PARA_INFO_LOG("%s", "<-- [challenge]\n");
+               /* decrypt challenge number */
+               t->ret = para_decrypt_challenge(p->key_file, &p->challenge_nr,
+                       (unsigned char *) p->buf, 64);
+               if (t->ret > 0)
+                       p->status = CL_RECEIVED_CHALLENGE;
+               return;
+       case CL_RECEIVED_CHALLENGE: /* send decrypted challenge */
+               PARA_INFO_LOG("--> %lu\n", p->challenge_nr);
+               t->ret = send_va_buffer(p->fd, "%s%lu", CHALLENGE_RESPONSE_MSG,
+                       p->challenge_nr);
+               if (t->ret > 0)
+                       p->status = CL_SENT_CH_RESPONSE;
+               return;
+       case CL_SENT_CH_RESPONSE: /* read server response */
+               {
+               size_t bytes_received;
+               unsigned char rc4_buf[2 * RC4_KEY_LEN] = "";
+               p->loaded = 0;
+               t->ret = client_recv_buffer(p);
+               if (t->ret < 0)
+                       return;
+               bytes_received = t->ret;
+               PARA_INFO_LOG("++++ server info ++++\n%s\n++++ end of server "
+                       "info ++++\n", p->buf);
+               /* check if server has sent "Proceed" message */
+               t->ret = -E_CLIENT_AUTH;
+               if (!strstr(p->buf, PROCEED_MSG))
+                       return;
+               t->ret = 1;
+               p->status = CL_RECEIVED_PROCEED;
+               if (bytes_received < PROCEED_MSG_LEN + 32)
+                       return;
+               PARA_INFO_LOG("%s", "decrypting session key\n");
+               t->ret = para_decrypt_buffer(p->key_file, rc4_buf,
+                       (unsigned char *)p->buf + PROCEED_MSG_LEN + 1,
+                       bytes_received - PROCEED_MSG_LEN - 1);
+               if (t->ret < 0)
+                       return;
+               RC4_set_key(&p->rc4_send_key, RC4_KEY_LEN, rc4_buf);
+               RC4_set_key(&p->rc4_recv_key, RC4_KEY_LEN, rc4_buf + RC4_KEY_LEN);
+               enable_crypt(p->fd, rc4_recv, rc4_send);
+               }
+       case CL_RECEIVED_PROCEED: /* concat args and send command */
+               {
+               int i;
+               char *command = NULL;
+               for (i = 0; i < p->conf.inputs_num; i++) {
+                       char *tmp = command;
+                       command = make_message("%s\n%s", command?
+                               command : "", p->conf.inputs[i]);
+                       free(tmp);
+               }
+               command = para_strcat(command, EOC_MSG "\n");
+               PARA_INFO_LOG("--> %s\n", command);
+               t->ret = send_buffer(p->fd, command);
+               free(command);
+               if (t->ret > 0)
+                       p->status = CL_SENT_COMMAND;
+               return;
+               }
+       case CL_SENT_COMMAND:
+               p->loaded = 0;
+               t->ret = client_recv_buffer(p);
+               if (t->ret < 0)
+                       return;
+               t->ret = -E_HANDSHAKE_COMPLETE;
+               if (strstr(p->buf, AWAITING_DATA_MSG))
+                       p->status = CL_SENDING_STDIN;
+               else
+                       p->status = CL_RECEIVING_SERVER_OUTPUT;
+               return;
+       case CL_SENDING_STDIN: /* FIXME: might block */
+               PARA_INFO_LOG("loaded: %d\n", *p->in_loaded);
+               t->ret = send_bin_buffer(p->fd, p->inbuf, *p->in_loaded);
+               if (t->ret <= 0) {
+                       if (!t->ret)
+                               t->ret = 1;
+                       return;
+               }
+               *p->in_loaded = 0; /* FIXME: short writes */
+               return;
+       case CL_RECEIVING_SERVER_OUTPUT:
+               t->ret = client_recv_buffer(p);
+               return;
+       }
+
+}
+static int client_open(struct private_client_data *pcd)
+{
+       int 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;
-
-               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);
+               pcd->conf.hostname_arg);
+       ret = get_host_info(pcd->conf.hostname_arg, &he);
+       if (ret < 0)
+               goto out;
        /* get new socket */
-       if ((sockfd = get_socket()) < 0)
-               exit(EXIT_FAILURE);
+       ret = get_socket();
+       if (ret < 0)
+               goto out;
+       pcd->fd = ret;
        /* 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)
-               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;
+       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);
+       if (ret < 0)
+               goto out;
+       pcd->status = CL_CONNECTED;
+       pcd->task.pre_select = client_pre_select;
+       pcd->task.post_select = client_post_select;
+       pcd->task.private_data = pcd;
+       sprintf(pcd->task.status, "client");
+       register_task(&pcd->task);
+       ret = 1;
+out:
+       return ret;
+}
+
+static void client_event_handler(struct task *t)
+{
+       struct private_client_data *p = t->private_data;
+
+       PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
+       if (t->ret != -E_HANDSHAKE_COMPLETE) {
+               unregister_task(t);
+               p->eof = 1;
+               return;
        }
-       /* 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 (p->status == CL_SENDING_STDIN) {
+               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_eof = &sit.eof;
+               return;
        }
-       if (!numbytes)
-               PARA_NOTICE_LOG("%s", "connection closed by peer\n");
-       close(sockfd);
-       if (interactive)
-               goto interactive_loop;
-       return 0;
+       stdout_set_defaults(&sot);
+       sot.buf = p->buf;
+       sot.loaded = &p->loaded;
+       sot.input_eof = &p->eof;
+       register_task(&sot.task);
+}
+
+/*
+ * MAIN
+ */
+int main(int argc, char *argv[])
+{
+
+       int ret;
+       struct sched s;
+
+       s.default_timeout.tv_sec = 1;
+       s.default_timeout.tv_usec = 0;
+       ret = client_parse_config(argc, argv, &pcd);
+       if (ret < 0)
+               goto out;
+       pcd->task.event_handler = client_event_handler;
+       ret = client_open(pcd);
+       if (ret < 0)
+               goto out;
+       ret = sched(&s);
+       client_close(pcd);
+out:
+       if (ret < 0)
+               PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
+       return ret >= 0? EXIT_SUCCESS: EXIT_FAILURE;
 }