client.c

   1 /*
   2  * Copyright (C) 1997-2009 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file client.c the client program used to connect to para_server */
   8
   9 #include <regex.h>
  10 #include <openssl/rc4.h>
  11 #include <stdbool.h>
  12
  13 #include "para.h"
  14 #include "list.h"
  15 #include "sched.h"
  16 #include "crypt.h"
  17 #include "client.cmdline.h"
  18 #include "string.h"
  19 #include "stdin.h"
  20 #include "stdout.h"
  21 #include "client.h"
  22 #include "error.h"
  23
  24 INIT_CLIENT_ERRLISTS;
  25
  26 static struct client_task *ct;
  27 static struct stdin_task sit;
  28 static struct stdout_task sot;
  29
  30 static void supervisor_post_select(__a_unused struct sched *s, struct task *t)
  31 {
  32         if (ct->task.error < 0) {
  33                 t->error = ct->task.error;
  34                 return;
  35         }
  36         if (ct->status == CL_SENDING) {
  37                 stdin_set_defaults(&sit);
  38                 sit.buf = para_malloc(sit.bufsize),
  39                 register_task(&sit.task);
  40                 ct->inbuf = sit.buf;
  41                 ct->in_loaded = &sit.loaded;
  42                 ct->in_error = &sit.task.error;
  43                 t->error = -E_TASK_STARTED;
  44                 return;
  45         }
  46         if (ct->status == CL_RECEIVING) {
  47                 stdout_set_defaults(&sot);
  48                 sot.bufp = &ct->buf;
  49                 sot.loaded = &ct->loaded;
  50                 sot.input_error = &ct->task.error;
  51                 register_task(&sot.task);
  52                 t->error = -E_TASK_STARTED;
  53                 return;
  54         }
  55 }
  56
  57 static struct task svt = {
  58         .post_select = supervisor_post_select,
  59         .status = "supervisor task"
  60 };
  61
  62 static int client_loglevel; /* loglevel */
  63 INIT_STDERR_LOGGING(client_loglevel);
  64
  65
  66 /**
  67  * The client program to connect to para_server.
  68  *
  69  * \param argc Usual argument count.
  70  * \param argv Usual argument vector.
  71  *
  72  * It registers two tasks: The client task that communicates with para_server
  73  * and the supervisor task that minitors whether the client task intends to
  74  * read from stdin or write to stdout.
  75  *
  76  * Once it has been determined whether the client command corresponds to a
  77  * stdin command (addmood, addimg, ..), either the stdin task or the stdout
  78  * task is set up to replace the supervisor task.
  79  *
  80  * \return EXIT_SUCCESS or EXIT_FAILURE
  81  *
  82  * \sa client_open(), stdin.c, stdout.c, para_client(1), para_server(1)
  83  */
  84 int main(int argc, char *argv[])
  85 {
  86
  87         int ret;
  88         static struct sched s;
  89
  90         init_random_seed_or_die();
  91         s.default_timeout.tv_sec = 1;
  92         s.default_timeout.tv_usec = 0;
  93         ret = client_open(argc, argv, &ct, &client_loglevel);
  94         if (ret < 0) /* can not use PARA_LOG here because ct is NULL */
  95                 exit(EXIT_FAILURE);
  96         register_task(&svt);
  97         ret = schedule(&s);
  98         if (ret < 0)
  99                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 100         client_close(ct);
 101         return ret >= 0? EXIT_SUCCESS: EXIT_FAILURE;
 102 }